Masterbatch Advanced Twin-Screw Extrusion Technology Applications and Comprehensive Processing Solutions

1. Overview of Masterbatch Industry and Core Knowledge

1.1 Current Situation and Development Trend of Masterbatch Industry

Masterbatch, also known as color masterbatch or color concentrate, is a new type of plastic coloring material with high concentration, high dispersibility and convenient use. It is made by uniformly dispersing pigments or dyes, carriers and additives in a specific proportion through professional mixing and extrusion granulation technology. Compared with the traditional direct coloring method (directly adding pigments to plastic raw materials), masterbatch has the advantages of convenient use, uniform coloring, stable performance, environmental protection and energy saving, which has gradually replaced the traditional coloring method and become the mainstream coloring solution in the plastics industry.

In recent years, driven by the rapid development of downstream industries such as packaging, automotive, textiles, electronics, construction and home appliances, the global masterbatch market has shown a steady and rapid growth trend. According to relevant industry data, the global masterbatch market size has exceeded 30 billion US dollars, and it is expected to maintain a compound annual growth rate of 6%-8% in the next five years. Among them, Asia-Pacific is the world’s largest masterbatch production and consumption market, accounting for more than 60% of the global market share, mainly due to the rapid development of the plastics industry in China, India and other countries, the continuous improvement of industrial supporting capacity, and the increasing demand for high-quality, functional and environmentally friendly masterbatch products.

China, as the world’s largest masterbatch producer and consumer, has a huge market demand and a complete industrial chain. The annual output and consumption of masterbatch are growing at a double-digit rate, especially in the fields of new energy vehicles, green packaging, high-end textiles and medical devices, the demand for high-performance masterbatch (such as high-temperature resistant masterbatch, flame-retardant masterbatch, environmental protection masterbatch) is showing an explosive growth trend. With the continuous improvement of global environmental protection policies (such as the ban on toxic and harmful pigments) and the upgrading of consumer demand for high-quality plastic products, the masterbatch industry is gradually developing towards high concentration, high dispersibility, functionalization, environmental protection and intelligence.

The main development trends of the masterbatch industry are reflected in four aspects: first, environmental protection and low toxicity. With the strengthening of environmental protection awareness and the strictness of environmental protection policies, non-toxic, harmless, low-volatile and degradable environmental protection masterbatch will become the mainstream of the market, and toxic and harmful pigments (such as heavy metal pigments) will be gradually eliminated; second, functionalization. In addition to coloring, masterbatch is also developing towards functional integration, such as flame-retardant masterbatch, antistatic masterbatch, antibacterial masterbatch, UV-resistant masterbatch, which can meet the special use requirements of downstream products; third, high concentration and high dispersibility. High-concentration masterbatch can reduce the addition amount, reduce production costs, and high dispersibility can ensure uniform coloring of plastic products, avoid color spots and color difference, which is the key to improving product quality; fourth, intelligence and automation of processing. Masterbatch processing requires strict control of mixing uniformity, temperature and other parameters. Intelligent, automatic twin-screw extrusion production lines will become the mainstream, realizing real-time monitoring, automatic parameter adjustment and mass production, improving production efficiency and product consistency.

As the core processing equipment of masterbatch, twin-screw extruders play a crucial role in the development of the masterbatch industry. Masterbatch mixing has strict requirements on the mixing and dispersing effect, temperature control and production efficiency of extruders. Zhuoyue’s full series of extruders (HTS BASIC/PLUS/SUPER, ZTE, HTE) are specially designed for masterbatch processing, with targeted performance advantages, which can effectively meet the processing needs of different types of masterbatch and help manufacturers improve product quality and production efficiency.

1.2 Core Composition and Working Principle of Masterbatch

Masterbatch is composed of three basic elements: pigments or dyes, carriers and additives. The proportion and performance of each element directly determine the quality and use effect of masterbatch. Understanding the core composition and working principle of masterbatch is the basis for mastering its processing technology and selecting appropriate extrusion equipment.

1.2.1 Pigments or Dyes: The Core Coloring Component

Pigments or dyes are the core components that give masterbatch coloring performance, accounting for 10%-80% of the masterbatch composition (the specific proportion depends on the type of pigment, coloring requirements and masterbatch concentration). Pigments are divided into organic pigments and inorganic pigments: organic pigments have bright colors, high tinting strength, good transparency, but poor heat resistance and weather resistance, mainly used in low-temperature processing plastics (such as PE, PP) and products with high color requirements (such as textiles, packaging films); inorganic pigments have good heat resistance, weather resistance and chemical stability, but low tinting strength and poor transparency, mainly used in high-temperature processing plastics (such as engineering plastics) and outdoor products (such as building materials, automotive exterior parts).

Dyes are different from pigments. Dyes have good solubility in plastic raw materials, bright colors and high transparency, but poor heat resistance and light resistance, mainly used in transparent plastic products (such as PET bottles, PC sheets). The selection of pigments or dyes should be based on the type of plastic raw materials (processing temperature), product use environment (indoor/outdoor), coloring requirements (color brightness, transparency) and environmental protection requirements, to ensure that the masterbatch has stable coloring performance and meets the use requirements of downstream products.

1.2.2 Carriers: The Dispersion and Adhesion Component

Carriers are the matrix of masterbatch, accounting for 10%-80% of the masterbatch composition, mainly playing the role of dispersing pigments/dyes and adhering to plastic raw materials. The carrier must have good compatibility with both pigments/dyes and the target plastic raw materials (the plastic raw materials to be colored), otherwise it will affect the dispersibility of pigments and the coloring effect of products. Common carrier materials include polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polyamide (PA), polyethylene terephthalate (PET), etc., which are selected according to the type of target plastic raw materials: for example, PE carrier is used for PE plastic coloring, PP carrier is used for PP plastic coloring, and PA carrier is used for engineering plastic PA coloring.

The carrier should also have good processing fluidity, which is conducive to the uniform dispersion of pigments during extrusion processing and the mixing of masterbatch with target plastic raw materials. In addition, the melting point and processing temperature of the carrier should be consistent with or slightly lower than that of the target plastic raw materials, to avoid the decomposition of the carrier or the target plastic during processing.

1.2.3 Additives: The Auxiliary Functional Component

Additives are auxiliary components added to improve the processing performance, dispersibility and use performance of masterbatch, accounting for 1%-10% of the masterbatch composition. The type and dosage of additives are determined according to the type of masterbatch and processing requirements. Common additives include:

• Dispersants: The most important additive in masterbatch, which can reduce the surface tension of pigments, prevent pigment agglomeration, and make pigments uniformly dispersed in the carrier. Common dispersants include polyethylene wax, polypropylene wax, stearic acid, calcium stearate, etc. The addition of dispersants can significantly improve the dispersibility of masterbatch, ensure uniform coloring of products, and reduce the wear of extrusion equipment.
• Compatibilizers: Used to improve the compatibility between pigments and carriers, and between masterbatch and target plastic raw materials. For example, when the carrier and target plastic have poor compatibility (such as PE carrier and PA plastic), compatibilizers (such as maleic anhydride grafted polyethylene) can be added to enhance the bonding force between them, avoid the separation of masterbatch and target plastic during processing, and improve the mechanical properties of products.
• Heat Stabilizers: Used to prevent the decomposition of pigments, carriers and target plastics during high-temperature extrusion processing. Common heat stabilizers include lead salts, calcium-zinc stabilizers, organic tin stabilizers, etc., which are selected according to the processing temperature and environmental protection requirements.
• Light Stabilizers and Antioxidants: Used to improve the weather resistance and aging resistance of masterbatch and colored plastic products, prevent the color fading and performance degradation of products under sunlight and oxygen, and extend the service life of products.
• Lubricants: Used to reduce the friction between materials and extrusion equipment (screw, barrel, die head), improve processing fluidity, reduce energy consumption, and avoid material sticking to equipment, which is conducive to the smooth progress of extrusion processing.

1.2.4 Working Principle of Masterbatch

The working principle of masterbatch is based on the uniform dispersion of high-concentration pigments in the carrier. During the processing of plastic products, a small amount of masterbatch (usually 1%-5%) is mixed with uncolored plastic raw materials. Under the action of high temperature and shear force during extrusion or injection molding, the carrier of the masterbatch melts and mixes with the target plastic raw materials, and the uniformly dispersed pigments are released and uniformly distributed in the target plastic matrix, thus achieving the purpose of coloring plastic products. The key of this process is that the pigments in the masterbatch must be uniformly dispersed without agglomeration, otherwise it will cause color spots, color difference and other defects in the colored products.

1.3 Common Classification of Masterbatch

Masterbatch can be divided into different types according to different classification standards, such as coloring type, carrier type, application field, functional type, etc. The correct classification helps to better understand the performance characteristics and processing requirements of masterbatch, and select appropriate extrusion equipment and processing techniques.

1.3.1 Classification by Coloring Type

According to the type of coloring component, masterbatch can be divided into color masterbatch, white masterbatch and black masterbatch.

• Color Masterbatch: The most common type of masterbatch, which uses organic or inorganic pigments of various colors (such as red, yellow, blue, green, orange) as coloring components, and is used for coloring plastic products of various colors. The tinting strength, color brightness and dispersibility of color masterbatch are the key indicators to measure its quality.
• White Masterbatch: Using titanium dioxide (TiO2) as the main coloring component, it is used for whitening plastic products or as a base color for light-colored masterbatch. The whiteness, covering power and dispersibility of white masterbatch are the key indicators. Titanium dioxide has high hardness, which has high requirements on the wear resistance of extrusion equipment.
• Black Masterbatch: Using carbon black as the main coloring component, it is used for black coloring of plastic products. Carbon black has good UV resistance and weather resistance, and can also improve the mechanical properties of plastic products. The dispersibility of carbon black is the key to the quality of black masterbatch. Poor dispersibility will cause black spots and streaks in products.

1.3.2 Classification by Carrier Type

According to the type of carrier, masterbatch can be divided into PE masterbatch, PP masterbatch, PVC masterbatch, PA masterbatch, PET masterbatch, etc.

• PE Masterbatch: Using PE as the carrier, it is suitable for coloring PE plastic products (such as PE films, PE pipes, PE injection molding parts). It has good compatibility with PE raw materials, good processing fluidity and uniform coloring.
• PP Masterbatch: Using PP as the carrier, it is suitable for coloring PP plastic products (such as PP fibers, PP injection molding parts, PP sheets). It has good heat resistance and is suitable for high-temperature processing of PP.
• PVC Masterbatch: Using PVC as the carrier, it is suitable for coloring PVC plastic products (such as PVC pipes, PVC profiles, PVC films). It needs to be matched with PVC heat stabilizers to avoid PVC decomposition during processing.
• Engineering Plastic Masterbatch: Using engineering plastics (PA, PC, PBT, etc.) as carriers, it is suitable for coloring engineering plastic products (such as automotive parts, electrical components). It has good heat resistance and compatibility with engineering plastics, and has high requirements on extrusion processing equipment.

1.3.3 Classification by Application Field

According to the application field of masterbatch, it can be divided into fiber masterbatch, film masterbatch, blow molding masterbatch, extrusion masterbatch, injection molding masterbatch, etc., which correspond to the five major application fields of masterbatch.

• Fiber Masterbatch: Used for coloring chemical fibers (such as polyester fiber, nylon fiber), which is used in carpets, textiles, cushions and other products. It requires high dispersibility and color fastness, and no color fading during spinning and weaving.
• Film Masterbatch: Used for coloring plastic films (such as shopping bags, casting films, multi-layer films), which requires high transparency and uniform coloring, and no color spots or streaks on the film surface.
• Blow Molding Masterbatch: Used for coloring blow molding products (such as medical and cosmetic containers, lubricating oil and paint containers), which requires good processing fluidity and uniform coloring, and no deformation or color difference of the container.
• Extrusion Masterbatch: Used for coloring extrusion products (such as sheets, pipes, wires and cables), which requires good dimensional stability and uniform coloring, and no color difference on the product surface.
• Injection Molding Masterbatch: Used for coloring injection molding products (such as automotive parts, electronic products, construction materials, home appliances, furniture, toys), which requires high dispersibility and stable performance, and no color difference between batches of products.

1.3.4 Classification by Functional Type

According to the additional functions of masterbatch, it can be divided into ordinary masterbatch (only coloring function) and functional masterbatch (coloring + additional functions). Functional masterbatch is the development trend of the industry, and common types include flame-retardant masterbatch, antistatic masterbatch, antibacterial masterbatch, UV-resistant masterbatch, toughening masterbatch, etc. Functional masterbatch requires adding corresponding functional additives on the basis of ordinary masterbatch, which has higher requirements on the mixing and dispersing effect of extrusion equipment.

2. Core Processing Technology of Masterbatch: Twin-Screw Extrusion Technology

Masterbatch processing mainly includes mixing, extrusion, cooling, granulation and other processes, among which twin-screw extrusion technology is the core technology of masterbatch mixing and granulation. Compared with single-screw extrusion technology, twin-screw extrusion technology has the advantages of strong mixing and dispersing capacity, precise temperature control, short residence time, high production efficiency and strong adaptability to raw materials, which can effectively solve the key problems of masterbatch processing (such as pigment agglomeration, uneven mixing, low production efficiency) and ensure the quality of masterbatch products.

Masterbatch mixing is one of the main applications of twin-screw extruders. The quality of masterbatch is directly determined by the performance of the twin-screw extruder and the rationality of the processing process. The key requirements of masterbatch processing for twin-screw extruders are: strong mixing and dispersing effect (to ensure uniform dispersion of pigments), precise temperature control (to avoid pigment decomposition and carrier degradation), appropriate shear force (to break pigment agglomerates without damaging pigment particles), high production efficiency (to meet mass production needs) and good wear resistance (to adapt to the wear of high-hardness pigments such as titanium dioxide and carbon black).

2.1 Processing Difficulties of Masterbatch and Requirements for Extrusion Equipment

Although twin-screw extrusion technology is suitable for masterbatch processing, due to the particularity of masterbatch composition (high pigment content, easy agglomeration of pigments) and processing requirements (uniform dispersion, stable performance), there are still many difficulties in actual processing. The main processing difficulties and corresponding requirements for extrusion equipment are as follows:

2.1.1 Pigment Agglomeration and Poor Dispersibility

Pigments (especially inorganic pigments such as titanium dioxide and carbon black) have strong polarity and large specific surface area, which are easy to agglomerate into large particles during storage and mixing. If the agglomerates cannot be fully broken and dispersed during extrusion processing, the masterbatch will have poor dispersibility, and the colored plastic products will have color spots, color streaks and uneven coloring, which will seriously affect the product quality. This is the most common and key difficulty in masterbatch processing.

This requires the extrusion equipment to have strong mixing and dispersing capacity and appropriate shear force. The twin-screw extruder should adopt an intermeshing co-rotating structure, and the screw should be equipped with sufficient mixing elements and shearing elements to generate strong shear force and kneading force during rotation, which can fully break the pigment agglomerates and make the pigments uniformly dispersed in the carrier. In addition, the screw speed and extrusion pressure should be adjustable to adapt to different types of pigments and masterbatch concentrations.

2.1.2 Pigment Decomposition and Carrier Degradation Caused by Overheating

Most pigments (especially organic pigments) have poor heat resistance, and the carrier (such as PE, PP) also has a certain temperature resistance limit. If the extrusion temperature is too high or the residence time of the material in the extruder is too long, the pigment will decompose (resulting in color fading, discoloration), and the carrier will degrade (resulting in reduced mechanical properties of the masterbatch). This is another key difficulty in masterbatch processing.

This requires the extrusion equipment to have precise temperature control capacity and short residence time. The barrel of the extruder should be divided into multiple temperature control sections, and the temperature of each section should be precisely controlled within the optimal range (usually 150-220℃ for ordinary masterbatch, 200-280℃ for engineering plastic masterbatch), with a temperature control precision of ±1℃. The screw structure should be optimized to shorten the residence time of the material in the extruder (usually 1-3 minutes), avoiding long-term contact between the material and high temperature.

2.1.3 Wear of Screw and Barrel Caused by High-Hardness Pigments

Inorganic pigments such as titanium dioxide and carbon black have high hardness (Mohs hardness 5-7), which will cause serious wear to the screw and barrel of the extruder during extrusion processing. If the screw and barrel have poor wear resistance, they will be worn quickly, resulting in reduced shear force and mixing capacity of the extruder, affecting the dispersibility of the masterbatch and reducing the service life of the equipment.

This requires the screw and barrel of the extruder to be made of high-quality wear-resistant materials and processed by advanced manufacturing technology. For example, the screw and barrel can be made of imported wear-resistant alloy steel, and undergo bimetallic composite treatment or laser cladding treatment, which can greatly improve the wear resistance and corrosion resistance of the screw and barrel, and adapt to the processing of masterbatch with high-hardness pigments.

2.1.4 Instability of Product Quality Between Batches

Masterbatch processing requires strict control of various parameters (such as formula ratio, mixing time, extrusion temperature, screw speed, feeding speed). If the parameters fluctuate, the quality of the masterbatch (such as concentration, dispersibility, tinting strength) will be unstable, resulting in color difference between batches of colored products, which will affect the reputation of the manufacturer.

This requires the extrusion equipment to have intelligent control capacity and stable performance. The extruder should be equipped with a PLC intelligent control system, which can realize precise control of feeding speed, screw speed, extrusion temperature and other parameters, and store multiple sets of formula parameters. When producing different batches of masterbatch, only the corresponding parameters need to be called, avoiding repeated debugging, ensuring the stability of product quality between batches.

2.1.5 High Requirements on Processing Fluidity

Masterbatch has high pigment content, which will reduce the processing fluidity of the material. If the processing fluidity is too poor, the material will be difficult to convey and extrude, resulting in low production efficiency, unstable extrusion pressure and even equipment blockage.

This requires the extrusion equipment to have strong conveying capacity and adjustable shear force. The twin-screw extruder should adopt a reasonable screw pitch, lead and compression ratio design, and the screw should be equipped with sufficient conveying elements to ensure the smooth conveying of materials. In addition, the extrusion temperature can be appropriately adjusted to improve the processing fluidity of the material, and lubricants can be added to reduce the friction between materials.

2.2 Working Principle and Process Flow of Masterbatch Twin-Screw Extrusion

The twin-screw extrusion process of masterbatch is a complex physical mixing process, which mainly includes raw material pretreatment, premixing, feeding, melting, mixing and shearing, extrusion, cooling, granulation, screening and packaging. The core purpose is to uniformly disperse pigments, carriers and additives to form high-quality masterbatch granules. The specific working principle and process flow are as follows:

2.2.1 Raw Material Pretreatment

Raw material pretreatment is the foundation of masterbatch extrusion processing, which directly affects the mixing effect and product quality. The raw materials of masterbatch mainly include pigments/dyes, carriers, additives (dispersants, compatibilizers, heat stabilizers, etc.). The pretreatment steps are as follows:

• Drying Treatment: Some pigments (such as organic pigments) and carriers (such as PA, PET) have high water absorption. If the moisture content is too high, it will cause bubbles, agglomeration and other defects in the masterbatch during extrusion processing, and even cause hydrolytic degradation of the carrier. Therefore, the raw materials must be dried before processing. The drying temperature and time are determined according to the type of raw material: for example, organic pigments are dried at 60-80℃ for 2-4 hours, PE/PP carriers are dried at 80-100℃ for 3-5 hours, and PA carriers are dried at 100-120℃ for 6-8 hours. The moisture content of the dried raw materials should be controlled below 0.1%.
• Crushing and Sieving: For pigments with large particle size (such as titanium dioxide agglomerates) and carriers with uneven particle size, crushing and sieving treatment should be carried out to ensure the uniformity of raw materials. The particle size of the crushed raw materials should be controlled at 20-40 mesh, which is conducive to the uniform mixing of raw materials and the breaking of pigment agglomerates during extrusion.
• Impurity Removal: The raw materials may contain impurities (such as metal particles, stones, dust) during production and transportation. Impurities not only affect the quality of the masterbatch, but also wear the screw and barrel of the extruder, and even cause equipment blockage. Therefore, the raw materials must be filtered and removed before use, using a filter screen with appropriate mesh size to remove impurities.

2.2.2 Premixing

Premixing is the key step to improve the mixing and dispersing effect of masterbatch. According to the formula ratio, the dried, crushed and impurity-removed pigments, carriers and additives are put into a high-speed mixer for premixing. The purpose of premixing is to make the pigments and additives uniformly adhere to the surface of the carrier particles, form a preliminary mixture, and lay a foundation for the uniform dispersion during extrusion.

The key parameters of premixing are mixing speed, mixing time and mixing temperature. The mixing speed is generally 800-1200 rpm, the mixing time is 5-10 minutes, and the mixing temperature is controlled at 40-60℃. The appropriate mixing temperature can improve the adhesion of additives (such as dispersants) to the carrier and pigments, promoting uniform mixing. For masterbatch with high pigment content (such as 50% above), the premixing time can be appropriately extended, and a small amount of dispersant can be added first to improve the dispersibility of pigments. After premixing, the mixture should be uniform in color, without obvious pigment agglomerates and additive particles.

2.2.3 Feeding and Conveying

The premixed mixture is sent to the feeding hopper of the twin-screw extruder through a screw feeder or a belt feeder. The feeding device of the extruder is usually equipped with a frequency conversion speed regulation function, which can adjust the feeding speed according to the screw speed and extrusion speed to ensure that the materials enter the extrusion cavity stably and uniformly, avoiding material accumulation or insufficient feeding.

The feeding hopper is also equipped with a drying device (such as an electric heating jacket) to prevent the raw materials from absorbing moisture again during feeding. For masterbatch with high pigment content and poor fluidity, a forced feeding device can be selected to ensure the smooth feeding of materials. In addition, the feeding port of the extruder should be smooth, without dead corners, to avoid material sticking and accumulation.

2.2.4 Melting, Mixing and Shearing

The materials entering the extrusion cavity of the twin-screw extruder are pushed forward continuously by the rotating screws. The extrusion cavity is composed of a screw and a barrel, and the volume of the extrusion cavity gradually decreases along the axis direction. When the screws rotate, the materials are gradually compressed under the action of the screws and the barrel, and the pressure in the extrusion cavity gradually increases (generally 5-12MPa).

At the same time, the materials are subjected to strong shear force and friction force generated by the relative movement between the screws and the barrel, as well as between the screw flights. The shear force and friction force can fully break the agglomerates of pigments, make the pigments uniformly dispersed in the melted carrier, and promote the fusion and compatibility between the pigment, carrier and additives. The friction force can also generate a certain amount of heat, which is combined with the external heating of the barrel (electric heating or steam heating) to make the carrier gradually melt and plasticize.

The barrel of the extruder is usually divided into 4-6 temperature control sections (feeding section, melting section, mixing section, homogenizing section, die head section), and the temperature of each section is precisely controlled according to the type of masterbatch (carrier type, pigment type). For example, when processing PE masterbatch, the temperature of the feeding section is 100-120℃, the melting section is 160-180℃, the mixing section is 170-190℃, the homogenizing section is 160-180℃, and the die head section is 150-170℃. The precise temperature control can ensure that the carrier is fully melted without thermal decomposition, and the pigments are not decomposed or discolored.

The screw of the twin-screw extruder adopts a modular design, which can freely combine different screw elements (such as conveying elements, mixing elements, shearing elements) according to the type of masterbatch. For example, when processing masterbatch with high pigment content and easy agglomeration, more mixing elements and shearing elements can be configured to enhance the mixing and dispersing effect; when processing masterbatch with good fluidity, more conveying elements can be configured to improve production efficiency.

2.2.5 Extrusion and Shaping

The fully melted, mixed and dispersed material is pushed to the die head of the extruder by the screws. The die head of the masterbatch extruder is usually equipped with multiple circular die holes (the number and size of die holes are determined according to the particle size of the masterbatch). The material is extruded from the die head at a high speed to form continuous strip-shaped semi-finished products (the diameter of the strip is usually 2-5mm, which can be adjusted according to customer needs).

The temperature of the die head is slightly lower than that of the homogenizing section, which can prevent the material from decomposing due to excessive temperature and ensure the shaping effect of the strip. The extrusion speed is controlled according to the type of masterbatch and the particle size requirement, generally ranging from 1-3m/min. The extrusion pressure should be kept stable (fluctuation within ±0.5MPa), which can ensure the uniform diameter of the strip and the consistency of the masterbatch quality.

2.2.6 Cooling and Solidification

The extruded strip-shaped semi-finished products are sent to a cooling device for rapid cooling and solidification. The cooling method for masterbatch is usually water tank cooling, and the cooling water temperature is controlled at 20-30℃. The length of the cooling water tank is 3-5 meters, and the cooling time is 2-4 minutes. Rapid cooling can make the strip solidify quickly, maintain the shape and size of the strip, and avoid deformation and adhesion.

It should be noted that the cooling speed should be uniform. If the cooling speed is too fast, the internal stress of the strip will be too large, and the strip will be brittle and easy to break during granulation; if the cooling speed is too slow, the strip will be soft and easy to adhere, affecting the granulation effect. After cooling, the surface of the strip should be dry, smooth and free of bubbles and cracks.

2.2.7 Cutting and Granulation

After cooling and solidification, the strip is sent to a granulator for cutting to form granular masterbatch products. The granulator is equipped with a rotary knife and a fixed knife, and the cutting speed is adjustable (generally 500-1000 rpm). The particle size of the masterbatch is controlled by adjusting the cutting speed and the speed of the strip conveying. The common particle size of masterbatch is 2-5mm (length and diameter are basically the same), which is convenient for mixing with plastic raw materials during later use.

The granulator should be equipped with a screening device to remove unqualified particles (such as too large, too small, agglomerated or broken particles). The qualified particles enter the next process, and the unqualified particles are crushed and recycled (after drying and premixing, they are re-extruded and granulated).

2.2.8 Screening, Inspection and Packaging

The granulated masterbatch is sent to a vibrating screen for screening to further remove unqualified particles and impurities. The vibrating screen is equipped with a multi-layer screen (different mesh sizes), which can screen out masterbatch particles of different specifications according to customer needs.

After screening, the masterbatch needs to undergo quality inspection. The inspection items mainly include: color (uniformity, consistency with the standard sample), dispersibility (observed by microscope or test piece coloring), concentration (tinting strength test), moisture content, particle size distribution, etc. Only the masterbatch that meets the quality standards can be packaged.

The packaging of masterbatch adopts sealed and moisture-proof packaging (such as plastic woven bags with inner plastic film, aluminum foil bags), and the packaging weight is usually 25kg/bag or 50kg/bag. The packaging bag is marked with the product name, model, color, concentration, carrier type, production date, shelf life, manufacturer and other information. The packaged masterbatch should be stored in a dry, cool and ventilated warehouse, avoiding direct sunlight and moisture, and the shelf life is generally 6-12 months.

2.3 Key Factors Affecting Masterbatch Twin-Screw Extrusion Effect

The effect of twin-screw extrusion directly affects the quality of masterbatch (dispersibility, tinting strength, stability). There are many factors affecting the extrusion effect, mainly including raw material characteristics, formula ratio, premixing effect, extrusion parameters and equipment performance. Mastering these key factors and making scientific adjustments can ensure the stability of the extrusion effect and the consistency of product quality.

2.3.1 Raw Material Characteristics

The type, particle size, moisture content and purity of raw materials have a great impact on the extrusion effect. For pigments, the particle size should be uniform and fine (20-40 mesh), and the agglomeration degree should be low; organic pigments have poor heat resistance, so the extrusion temperature should be strictly controlled; inorganic pigments have high hardness, so the extruder should have good wear resistance. For carriers, the melting point and processing temperature should be consistent with the target plastic raw materials, and the compatibility with pigments should be good. For additives, the type and dosage should be reasonable, and the compatibility with carriers and pigments should be good.

In addition, the moisture content of raw materials must be strictly controlled below 0.1%; if the moisture content is too high, it will cause bubbles and agglomeration in the masterbatch. The purity of raw materials is also very important; impurities in raw materials will not only affect the product quality, but also wear the screw and barrel of the extruder.

2.3.2 Formula Ratio

The formula ratio of masterbatch (the ratio of pigment, carrier and additive) is the key to determining the quality of the product. The pigment content should be determined according to the coloring requirements and the type of pigment: high-concentration masterbatch (pigment content 50%-80%) can reduce the addition amount and production cost, but requires better dispersibility; low-concentration masterbatch (pigment content 10%-30%) has better dispersibility, but the addition amount is large and the production cost is high.

The dosage of dispersants is generally 1%-5% of the pigment dosage; too little dispersant will lead to poor dispersibility of pigments, and too much dispersant will affect the mechanical properties of the masterbatch and the colored products. The dosage of other additives (compatibilizers, heat stabilizers, lubricants) is generally 0.5%-3%, which should be adjusted according to the type of masterbatch and processing requirements. The formula ratio should be strictly controlled, and the error should be within ±1%, to ensure the consistency of product quality between batches.

2.3.3 Premixing Effect

Premixing is the foundation of extrusion processing. The uniformity of premixing directly affects the mixing and dispersing effect of pigments during extrusion. If the premixing is uneven, the pigments cannot be uniformly adhered to the surface of the carrier, resulting in local agglomeration of pigments, uneven mixing of materials during extrusion, and reduced product dispersibility.

To ensure the premixing effect, it is necessary to control the mixing speed (800-1200 rpm), mixing time (5-10 minutes) and mixing temperature (40-60℃). For masterbatch with high pigment content, the premixing time can be appropriately extended, and the dispersant can be added first and mixed with the pigment, then mixed with the carrier and other additives. In addition, the premixed mixture should be inspected; if there are obvious pigment agglomerates, it should be crushed and remixed.

2.3.4 Extrusion Parameters

Extrusion parameters are the most important factors affecting the extrusion effect, mainly including screw speed, extrusion temperature and extrusion pressure.

• Screw Speed: The screw speed of twin-screw extruders for masterbatch processing generally ranges from 200 to 800 rpm. The higher the screw speed, the greater the shear force and friction force received by the materials, the better the mixing and dispersing effect of pigments, and the higher the production efficiency. However, if the screw speed is too high, the residence time of the materials in the extrusion cavity is too short, resulting in incomplete melting of the carrier, insufficient mixing of materials, and uneven dispersibility; if the screw speed is too low, the shear force and friction force are insufficient, the pigment agglomerates cannot be fully broken, and the production efficiency is low.
• The screw speed should be adjusted according to the type of masterbatch: for masterbatch with high pigment content and easy agglomeration (such as black masterbatch, white masterbatch), a higher screw speed (500-800 rpm) is needed to ensure the uniform dispersion of pigments; for masterbatch with organic pigments (poor heat resistance), a moderate screw speed (300-500 rpm) is needed to avoid overheating and pigment decomposition.
• Extrusion Temperature: The extrusion temperature is the key to ensuring the melting of the carrier and the stability of the pigment. The temperature of each section of the barrel and die head must be precisely controlled according to the type of masterbatch (carrier type, pigment type). The temperature of the feeding section is lower (slightly higher than the drying temperature of the raw materials), which is mainly to prevent the materials from caking and ensure smooth feeding; the temperature of the melting section is medium, which is mainly to promote the melting and plasticization of the carrier; the temperature of the mixing section is higher, which is mainly to enhance the shear and mixing effect, and promote the uniform dispersion of pigments; the temperature of the homogenizing section is slightly lower than the mixing section, which is mainly to ensure the uniform temperature and viscosity of the materials, and avoid thermal decomposition; the temperature of the die head section is slightly lower than the homogenizing section, which is to ensure the shaping effect of the strip.
• The temperature control precision should reach ±1℃. For example, when processing PP masterbatch with organic pigments, the temperature of each section is: feeding section 110-130℃, melting section 170-190℃, mixing section 180-200℃, homogenizing section 170-190℃, die head section 160-180℃. If the temperature is too high, the pigment will decompose and the carrier will degrade; if the temperature is too low, the carrier will not be fully melted, and the pigment cannot be uniformly dispersed.
• Extrusion Pressure: The extrusion pressure of masterbatch twin-screw extrusion generally ranges from 5 to 12MPa. The pressure in the extrusion cavity is mainly determined by the compression ratio of the screw, the die hole size and the screw speed. The higher the extrusion pressure, the better the mixing and dispersing effect of materials, and the denser the strip. However, if the pressure is too high, it will increase the energy consumption and wear of the equipment, and even cause the die head to block; if the pressure is too low, the materials cannot be fully compressed and mixed, the strip is loose, and the dispersibility is poor.
• The extrusion pressure should be adjusted according to the type of masterbatch and the die head size: for masterbatch with high pigment content and poor fluidity, a higher extrusion pressure is needed; for masterbatch with good fluidity, a moderate extrusion pressure is sufficient. The extrusion pressure should be kept stable, and the fluctuation should be within ±0.5MPa, to ensure the uniform diameter of the strip and the consistency of the masterbatch quality.

2.3.5 Equipment Performance

The performance of the twin-screw extruder directly determines the extrusion effect. The key performance indicators of the extruder include mixing and dispersing capacity, temperature control precision, wear resistance, conveying capacity and intelligent control capacity. Zhuoyue’s full series of extruders (HTS BASIC/PLUS/SUPER, ZTE, HTE) are specially designed for masterbatch processing, with excellent performance in these aspects, which can effectively meet the processing needs of different types of masterbatch.

3. Zhuoyue’s Full Series Extruders: Professional Solutions for Masterbatch Processing

Zhuoyue has long been engaged in the research, development and production of high-performance twin-screw extruders, and has accumulated rich experience in the field of masterbatch processing. According to the processing characteristics of masterbatch (high pigment content, easy agglomeration of pigments, strict temperature control requirements, high wear resistance requirements) and the diverse needs of manufacturers (different production scales, different masterbatch types, different application fields), Zhuoyue has launched a full series of extruders suitable for masterbatch processing, including HTS BASIC series, HTS PLUS series, HTS SUPER series, ZTE series and HTE series. Each series has its own performance characteristics and targeted adaptation scenarios, which can provide personalized and efficient processing solutions for masterbatch manufacturers of different scales.

3.1 Core Advantages of Zhuoyue’s Extruders for Masterbatch Processing

Whether it is the high-end HTS SUPER series or the cost-effective ZTE series, all Zhuoyue’s extruders have the following core advantages, which are specially optimized for masterbatch processing, ensuring high-quality, efficient and stable production:

3.1.1 Excellent Mixing and Dispersing Effect

The core requirement of masterbatch processing is the uniform dispersion of pigments. All Zhuoyue’s twin-screw extruders adopt an intermeshing co-rotating structure, with a reasonable screw pitch, lead and compression ratio design. The intermeshing and rotating of the twin screws can generate strong shear force and kneading force, which can fully break the agglomerates of pigments (even small agglomerates of 100μm above), and make the pigments uniformly dispersed in the carrier. The mixing uniformity of the extruders can reach more than 95%, which is much higher than that of ordinary twin-screw extruders (85%-90%).

In addition, the screws of all series of extruders adopt a modular design, which can freely combine different types of screw elements (conveying elements, mixing elements, shearing elements) according to the type of masterbatch (such as color masterbatch, white masterbatch, black masterbatch) and pigment characteristics. For example, when processing black masterbatch with carbon black (easy agglomeration), more mixing elements and shearing elements can be configured to enhance the mixing and dispersing effect; when processing color masterbatch with organic pigments (poor heat resistance), more conveying elements and fewer shearing elements can be configured to shorten the residence time and avoid pigment decomposition.

3.1.2 Precise Temperature Control, Avoiding Pigment Decomposition

Masterbatch processing has strict requirements on temperature control, and the temperature fluctuation must be controlled within ±1℃ to avoid pigment decomposition and carrier degradation. All Zhuoyue’s extruders adopt an advanced intelligent temperature control system, which is composed of high-precision temperature sensors, heating elements and cooling elements. The barrel is divided into 4-6 independent temperature control sections, and the temperature of each section can be precisely adjusted and controlled in real time.

The temperature control system is equipped with a real-time monitoring and alarm function: if the temperature of any section exceeds the set range, the system will issue an alarm prompt in time, and automatically adjust the heating power or start the cooling system to return the temperature to the set range. In addition, the barrel of the extruder adopts a double-layer jacket design, which can realize rapid heating and cooling, and improve the response speed of temperature control. The die head is also equipped with an independent temperature control device, which ensures the uniform temperature of the die head and the stable shaping of the strip.

3.1.3 High Wear Resistance, Long Service Life

Inorganic pigments such as titanium dioxide and carbon black have high hardness, which will cause serious wear to the screw and barrel of the extruder during processing. Zhuoyue’s extruders adopt high-quality wear-resistant materials and advanced manufacturing technology to ensure the wear resistance of the core components.

The screws and barrels of HTS PLUS series, HTS SUPER series and HTE series are made of imported wear-resistant alloy steel (such as 38CrMoAlA), and undergo bimetallic composite treatment or laser cladding treatment. The surface hardness of the screws and barrels can reach ≥65 HRC (HTS PLUS series, HTE series) and ≥70 HRC (HTS SUPER series), which has extremely strong wear resistance and corrosion resistance, and can effectively resist the wear caused by high-hardness pigments. The service life of the screws and barrels is 2-3 times that of ordinary extruders, reducing the frequency of component replacement and the maintenance cost of the equipment.

The screws and barrels of HTS BASIC series and ZTE series are made of high-quality wear-resistant alloy steel with nitriding treatment, and the surface hardness can reach ≥60 HRC, which can meet the processing needs of ordinary masterbatch (pigment content ≤50%) and has a reasonable cost performance.

3.1.4 High Production Efficiency, Energy Saving and Environmental Protection

Zhuoyue’s extruders adopt a high-torque gearbox and an optimized screw structure, which have strong conveying capacity and high production efficiency. Compared with ordinary twin-screw extruders, the production efficiency of Zhuoyue’s extruders can be increased by 20%-50%. For example, the production capacity of HTS SUPER series extruders can reach 1000-3000kg/h, which is suitable for large-scale mass production; the production capacity of ZTE series extruders is 100-500kg/h, which is suitable for small and medium-sized batch production.

In addition, all Zhuoyue’s extruders adopt high-efficiency motors and energy-saving heating elements, which can reduce energy consumption by 15%-20% compared with ordinary extruders. The extruders are equipped with a closed structure, which can reduce the emission of dust and volatile substances during processing, meeting the environmental protection requirements of the masterbatch industry.

3.1.5 Intelligent Control, Easy Operation and Maintenance

All Zhuoyue’s extruders adopt a PLC intelligent control system and a touch screen operation interface, which is simple and intuitive, easy to operate. The system can store multiple sets of product formulas and processing parameters (up to 100 sets), and when producing different types of masterbatch, only the corresponding formula and parameters need to be called, without repeated debugging, which saves time and improves production efficiency.

The system is also equipped with a real-time monitoring function, which can monitor the key parameters of the extrusion process (such as temperature, pressure, screw speed, feeding speed) in real time, and record the production data (such as output, processing time) for later query and analysis. For the HTS SUPER series extruders, we also provide a cloud control function, which can realize remote parameter adjustment, production data monitoring and predictive maintenance of equipment, realizing intelligent production management.

In addition, the extruders adopt a reasonable structural design, which makes the maintenance more convenient. The screws, barrels and die heads can be disassembled and assembled quickly, which reduces the maintenance time and labor intensity. Zhuoyue’s after-sales service team will provide professional installation, commissioning and training services for customers, ensuring that customers can use the equipment smoothly.

3.1.6 Wide Application Range, Strong Adaptability

Zhuoyue’s full series of extruders have a wide application range, which can adapt to the processing needs of various types of masterbatch, including color masterbatch, white masterbatch, black masterbatch, ordinary masterbatch, functional masterbatch (flame-retardant masterbatch, antistatic masterbatch), and masterbatch with different carriers (PE, PP, PVC, PA, PET, etc.). The extruders can also adapt to the processing of masterbatch with different pigment contents (10%-80%), and can meet the processing needs of different application fields (fibers, films, blow molding, extrusion, injection molding).

Whether it is a small and medium-sized manufacturer producing ordinary masterbatch, or a large-scale manufacturer producing high-end functional masterbatch, Zhuoyue can provide suitable extruder solutions. In addition, the extruders can be matched with different auxiliary equipment (such as high-speed mixers, dryers, coolers, granulators, screening machines, packaging machines) to form a complete automatic production line, realizing continuous production from raw material pretreatment to product packaging.

3.2 Detailed Introduction of Zhuoyue’s Extruder Series and Their Adaptation to Masterbatch Processing

Zhuoyue’s extruder series for masterbatch processing include HTS BASIC, HTS PLUS, HTS SUPER, ZTE and HTE, each series has its own unique performance characteristics and targeted adaptation scenarios. Manufacturers can select the appropriate extruder series according to their own production scale, product type, masterbatch concentration, application field and budget.

3.2.1 HTS BASIC Series Extruders: Flexible and Cost-Effective Choice for Ordinary Masterbatch

The HTS BASIC series extruders are a cost-effective product series designed for small and medium-sized masterbatch manufacturers or manufacturers that mainly produce ordinary masterbatch. This series of extruders uses medium-torque gearboxes from leading European manufacturers, which have the advantages of stable performance, low noise, high efficiency and long service life. The specific torque of the extruders is 10-12Nm/cm³, which can meet the processing needs of ordinary masterbatch (pigment content ≤50%), such as PE/PP color masterbatch, low-concentration white masterbatch and black masterbatch.

In terms of structural design, the HTS BASIC series extruders adopt a twin-screw parallel co-rotating structure, with a screw diameter ranging from 30mm to 65mm, and a compression ratio of 4～8, which can be adjusted according to the type of masterbatch. The barrel is made of wear-resistant alloy steel with nitriding treatment, and the screw is made of wear-resistant and corrosion-resistant alloy steel, which has good wear resistance. The extruder is equipped with a PLC control system and a touch screen operation interface, which can realize automatic feeding, automatic temperature control, automatic pressure control and automatic cutting, and is simple and easy to operate.

The production capacity of the HTS BASIC series extruders ranges from 100kg/h to 500kg/h, which is suitable for small and medium-sized masterbatch manufacturers that mainly produce ordinary masterbatch for films, injection molding and extrusion products. One of the biggest advantages of this series is that it can provide flexible options through different configuration combinations. Customers can choose different screw elements, die heads, feeding devices and post-processing equipment according to their own product types and production needs, so as to form a production line suitable for their own needs. The HTS BASIC series extruders have a reasonable price, which can help small and medium-sized manufacturers reduce the initial investment cost while ensuring the basic processing quality of masterbatch. It is an ideal choice for enterprises that are just entering the masterbatch industry or have limited production scale and budget. In addition, this series of extruders has simple operation and low maintenance cost, and its after-sales service support is consistent with other high-end series, which can fully meet the daily production needs of small and medium-sized manufacturers.

3.2.2 HTS PLUS Series Extruders: High-Torque Solution for Engineering Plastics and Filler Masterbatch

The HTS PLUS series extruders are positioned as mid-to-high-end products, specially developed for masterbatch processing scenarios with higher requirements, such as engineering plastic masterbatch and filler masterbatch. Different from the HTS BASIC series, this series adopts high-torque gearboxes independently developed and manufactured by Zhuoyue, with a specific torque of 13-16Nm/cm³, which can provide stronger shear force and kneading force, effectively solving the processing difficulties of high-viscosity, high-hardness masterbatch materials.

In terms of core components, the screws and barrels of the HTS PLUS series are made of imported wear-resistant alloy steel and undergo bimetallic composite treatment. The surface hardness reaches ≥65 HRC, which has excellent wear resistance and corrosion resistance, and can easily cope with the wear caused by filler masterbatch (such as calcium carbonate, talcum powder filled masterbatch) and engineering plastic masterbatch (such as PA, PC masterbatch). The screw adopts a modular design, and is equipped with enhanced mixing elements and shearing elements, which can fully disperse the fillers and pigments in the carrier, ensuring the uniformity and stability of the masterbatch. The barrel is divided into 5-6 temperature control sections, with a temperature control precision of ±1℃, which can accurately control the processing temperature of engineering plastics (200-280℃) and avoid material decomposition.

The production capacity of the HTS PLUS series extruders ranges from 300kg/h to 1200kg/h, which is suitable for medium-sized and large-scale masterbatch manufacturers that produce engineering plastic masterbatch, filler masterbatch, high-concentration color masterbatch (pigment content 50%-70%) and other products. For example, in the processing of PA engineering plastic masterbatch, the HTS PLUS series can rely on its high torque and precise temperature control to ensure that the PA carrier is fully melted, and the pigments and functional additives are uniformly dispersed, avoiding the problems of color spots, streaks and poor mechanical properties of the masterbatch. In the processing of filler masterbatch, its strong shear force can fully disperse the filler particles (which are easy to agglomerate) in the carrier, improving the compatibility between the filler and the carrier, and ensuring the processing performance of the masterbatch when mixed with downstream plastic raw materials.

In addition, the HTS PLUS series extruders are equipped with an upgraded PLC intelligent control system, which can realize more precise parameter control and data monitoring. The system can automatically adjust the screw speed, feeding speed and extrusion pressure according to the material viscosity and processing effect, ensuring the stability of product quality between batches. The extruder is also equipped with a forced feeding device and a vacuum exhaust device: the forced feeding device can ensure the smooth feeding of high-viscosity materials; the vacuum exhaust device can effectively remove moisture, volatile substances and air in the materials, avoiding bubbles and pores in the masterbatch, and improving the density and quality of the masterbatch. This series of extruders balances performance and cost, and is suitable for manufacturers that need to improve product quality and expand production scale.

3.2.3 HTS SUPER Series Extruders: The Pinnacle of Zhuoyue’s Technology for High-End Masterbatch

As Zhuoyue’s highest-end extruder series, the HTS SUPER series represents the advanced level of China’s twin-screw extruder development, specially designed for high-end, high-demand masterbatch processing scenarios, such as high-concentration functional masterbatch, special engineering plastic masterbatch (such as PBT, POM, LCP), and masterbatch for high-end downstream fields (new energy vehicles, medical devices, high-end electronics).

The core highlight of the HTS SUPER series is the adoption of Zhuoyue’s latest independently developed ultra-high torque transmission device, with a specific torque of 17-20Nm/cm³, which is far higher than that of the HTS PLUS series. This ultra-high torque design enables the extruder to cope with the processing of ultra-high viscosity, ultra-high hardness masterbatch materials, such as masterbatch with high filler content (filler content above 60%) and special engineering plastic masterbatch with high melting point and high viscosity. At the same time, aiming at the high torque and high speed characteristics of this series, Zhuoyue has carried out a comprehensive optimization of the structural design of all key components of the extruder: the screw adopts a new type of wear-resistant alloy steel and undergoes laser cladding treatment, with a surface hardness of ≥70 HRC, which has extremely strong wear resistance and service life (3-4 times that of ordinary extruders); the barrel adopts a double-layer jacket + forced cooling structure, which can realize rapid temperature adjustment and precise control, avoiding local overheating of materials during high-speed, high-torque processing; the gearbox adopts a precision planetary gear structure, with low noise, high efficiency and stable operation, which can withstand long-term high-load work.

In terms of mixing and dispersing effect, the HTS SUPER series is equipped with a new type of multi-stage mixing screw combination, including high-shear mixing elements, kneading blocks and dispersing elements, which can generate multi-directional shear force and kneading force, fully breaking the agglomerates of pigments and fillers (even agglomerates below 50μm), and making the pigments, fillers and carriers uniformly mixed. The mixing uniformity of the masterbatch can reach more than 98%, which is suitable for the processing of high-concentration, high-dispersibility masterbatch (pigment content 70%-80%). In addition, this series of extruders adopts a variable frequency speed regulation system with high precision, and the screw speed can be adjusted in the range of 300-1000 rpm, which can be flexibly adjusted according to the type of masterbatch and processing requirements, ensuring the best processing effect.

The production capacity of the HTS SUPER series extruders ranges from 1000kg/h to 3000kg/h, which is suitable for large-scale, high-standard masterbatch manufacturers that focus on high-end markets. For example, in the processing of masterbatch for new energy vehicle parts (such as automotive interior and exterior parts, battery shell masterbatch), the HTS SUPER series can ensure that the masterbatch has excellent weather resistance, high temperature resistance and dispersibility, meeting the strict quality requirements of automotive manufacturers; in the processing of medical grade masterbatch (such as masterbatch for medical catheters, medical containers), it can realize clean production, avoid material pollution, and ensure that the masterbatch meets the medical grade environmental protection standards. This series of extruders is also equipped with an intelligent cloud control system, which can realize remote parameter adjustment, production data monitoring, fault early warning and predictive maintenance. Manufacturers can monitor the production status of the equipment in real time through mobile phones or computers, realize intelligent production management, and greatly improve production efficiency and management level.

3.2.4 ZTE Series Extruders: Cost-Effective Choice for Universal Masterbatch Processing

The ZTE series extruders are positioned as cost-effective products, specially designed for manufacturers that need to balance processing quality and cost, and mainly produce universal ordinary masterbatch. This series of extruders has excellent cost performance, and its designed parameters can meet the processing needs of most common masterbatch materials (PE, PP, PVC masterbatch, low-concentration color masterbatch, black masterbatch and white masterbatch with pigment content ≤50%).

In terms of structural design, the ZTE series adopts a twin-screw parallel co-rotating structure, with a screw diameter ranging from 25mm to 65mm, and a specific torque of 8-11Nm/cm³, which can provide sufficient shear force and conveying capacity for ordinary masterbatch processing. The screws and barrels are made of high-quality wear-resistant alloy steel with nitriding treatment, and the surface hardness reaches ≥60 HRC, which can meet the wear requirements of ordinary pigments (such as organic pigments, low-hardness inorganic pigments) and has a long service life. The barrel is divided into 4 temperature control sections, with a temperature control precision of ±2℃, which can accurately control the processing temperature of ordinary masterbatch (150-220℃), avoiding pigment decomposition and carrier degradation.

The production capacity of the ZTE series extruders ranges from 50kg/h to 400kg/h, which is suitable for small and medium-sized masterbatch manufacturers, small workshops and enterprises that need to produce small batches of multi-variety masterbatch. This series of extruders has the advantages of simple structure, easy operation, low energy consumption and low maintenance cost. The operation interface adopts a simple touch screen design, which is easy to learn and master, and is suitable for operators with little experience. In addition, the ZTE series can also be flexibly configured according to customer needs, such as adding a forced feeding device, a vacuum exhaust device or a special die head, to meet the personalized processing needs of different customers. Although the ZTE series is cost-effective, its core performance indicators (such as mixing uniformity, temperature control precision) are far higher than those of ordinary extruders on the market, which can ensure that the produced masterbatch has uniform coloring, stable performance and meets the basic use requirements of downstream customers. It is an ideal choice for enterprises with limited budget and mainly producing ordinary masterbatch.

3.2.5 HTE Series Extruders: High-Performance and Cost-Effective Integrated Solution

The HTE series extruders integrate the advantages of high performance and cost-effectiveness, aiming at medium-sized masterbatch manufacturers that need to improve production efficiency and product quality while controlling costs. This series of extruders is designed to balance performance, efficiency and cost, and is suitable for a variety of masterbatch processing scenarios, including high-concentration color masterbatch (pigment content 50%-60%), ordinary functional masterbatch (flame-retardant masterbatch, antistatic masterbatch) and masterbatch for films, blow molding and injection molding products.

In terms of core performance, the HTE series adopts a high-torque gearbox independently developed by Zhuoyue, with a specific torque of 12-14Nm/cm³, which is higher than that of the HTS BASIC and ZTE series, and can provide stronger shear force and kneading force, ensuring the uniform dispersion of pigments and additives. The screws adopt a modular design, and are equipped with a combination of conveying elements, mixing elements and shearing elements, which can be flexibly adjusted according to the type of masterbatch, improving the adaptability of the extruder. The screws and barrels are made of imported wear-resistant alloy steel with bimetallic composite treatment, and the surface hardness reaches ≥65 HRC, which has excellent wear resistance and can cope with the processing of high-hardness pigments (such as titanium dioxide, carbon black) and low-content filler masterbatch.

The biggest advantage of the HTE series is that it can reduce energy consumption while improving production efficiency. This series of extruders adopts an optimized screw structure and a high-efficiency energy-saving motor, which can reduce energy consumption by 18%-25% compared with ordinary extruders of the same type. At the same time, its production capacity ranges from 200kg/h to 800kg/h, which is 15%-20% higher than that of the HTS BASIC series of the same specification. The barrel is divided into 5 temperature control sections, with a temperature control precision of ±1℃, which can accurately control the processing temperature, avoid material waste caused by overheating or insufficient melting, and further reduce production costs. In addition, the HTE series is equipped with a PLC intelligent control system, which can realize automatic parameter control, data monitoring and formula storage, ensuring the stability of product quality between batches. The extruder is also equipped with a vacuum exhaust device and a forced feeding device, which can improve the quality of masterbatch and ensure the smooth progress of production.

The HTE series is suitable for medium-sized masterbatch manufacturers that are in the stage of expanding production scale and upgrading product quality. It can not only meet the processing needs of high-quality masterbatch, but also control the production cost effectively, helping enterprises improve their market competitiveness. Compared with the HTS PLUS series, the HTE series has a more reasonable price; compared with the ZTE series, it has better performance and higher production efficiency, which is a cost-effective choice between mid-range and high-end products.

4. Wide Application Fields of Masterbatch and Matching Zhuoyue Extruder Solutions

As an indispensable core material in the plastics industry, masterbatch is widely used in fibers, films, blow molding, extrusion molding, injection molding and other fields. Different application fields have different requirements on the performance of masterbatch (such as dispersibility, temperature resistance, color fastness) and production efficiency, which also determines the selection of twin-screw extruders. Zhuoyue’s full series of extruders can provide targeted solutions for different application fields, ensuring that the produced masterbatch meets the specific requirements of downstream products. The following is a detailed introduction to the application fields of masterbatch and the matching Zhuoyue extruder series.

4.1 Fiber Field: High-Dispersibility and Color Fastness Requirements

Masterbatch in the fiber field is mainly used for coloring chemical fibers, such as polyester fiber, nylon fiber, polypropylene fiber, etc., and the final products include carpets, textiles, cushions, non-woven fabrics, etc. This field has extremely high requirements on masterbatch: first, high dispersibility. The fiber diameter is very small (usually a few microns to dozens of microns), and if the pigments in the masterbatch are not uniformly dispersed, it will cause color spots, streaks and uneven fineness of the fiber, affecting the appearance and quality of the fiber product; second, high color fastness. The fiber products need to go through spinning, weaving, dyeing and finishing and other processes, and the masterbatch must have good washing fastness, light fastness and friction fastness, avoiding color fading and discoloration; third, low impurity content. Impurities in the masterbatch will cause breakage of the fiber during spinning, reducing the yield of the fiber.

According to the requirements of the fiber field, the suitable Zhuoyue extruder series are HTS PLUS series, HTS SUPER series and HTE series. For high-end fiber masterbatch (such as high-grade textile fiber, carpet fiber), the HTS SUPER series is recommended. Its ultra-high mixing uniformity (≥98%) can ensure that the pigments are uniformly dispersed in the carrier, avoiding color spots and streaks of the fiber; the high-torque and precise temperature control can ensure the stability of the masterbatch performance, improving the color fastness of the fiber. For medium-grade fiber masterbatch (such as ordinary textile fiber, non-woven fabric), the HTS PLUS series and HTE series are recommended. Their high mixing and dispersing effect can meet the basic requirements of fiber masterbatch, and the cost performance is higher. For small-batch, low-cost fiber masterbatch, the HTS BASIC series can also be selected, which can ensure the basic dispersibility and color fastness.

4.2 Film Field: High Transparency and Uniform Coloring Requirements

Masterbatch in the film field is mainly used for coloring plastic films, such as shopping bags, casting films, multi-layer films, packaging films, agricultural films, etc. The key requirements of this field for masterbatch are: first, high transparency. For transparent or translucent films (such as food packaging films, agricultural mulch films), the masterbatch must have good transparency, avoiding affecting the appearance and visibility of the packaged products; second, uniform coloring. The film surface must be uniform in color, without color spots, color streaks and color difference, ensuring the aesthetic property of the film; third, good processing fluidity. The film extrusion speed is fast, and the masterbatch must have good fluidity, which is conducive to the uniform mixing of the masterbatch and the film base material, and avoiding affecting the film forming efficiency.

For the film field, the suitable Zhuoyue extruder series are HTS BASIC series, HTE series and HTS PLUS series. For ordinary film masterbatch (such as shopping bags, ordinary packaging films), the HTS BASIC series and HTE series are recommended. Their good mixing and dispersing effect can ensure uniform coloring of the film, and the good processing fluidity can match the high-speed extrusion of the film. For high-end film masterbatch (such as food packaging films, multi-layer composite films), the HTS PLUS series is recommended. Its precise temperature control can avoid the decomposition of pigments and carriers, ensuring the transparency and safety of the film; the enhanced mixing elements can further improve the dispersibility of the masterbatch, making the film surface more smooth and uniform. For ultra-high transparent film masterbatch (such as PET packaging films), the HTS SUPER series can be selected, which can achieve ultra-high dispersibility of pigments, ensuring the transparency and clarity of the film.

4.3 Blow Molding Field: Good Fluidity and Dimensional Stability Requirements

Masterbatch in the blow molding field is mainly used for coloring blow molding products, such as medical and cosmetic containers, lubricating oil and paint containers, beverage bottles, plastic barrels, etc. The requirements of this field for masterbatch are: first, good processing fluidity. Blow molding products need to be formed by high-temperature blow molding, and the masterbatch must have good fluidity, which is conducive to the uniform distribution of the masterbatch in the parison, avoiding uneven wall thickness and color difference of the product; second, good dimensional stability. The blow molding products have strict requirements on dimensional accuracy, and the masterbatch must have stable performance, avoiding the deformation of the product due to uneven shrinkage; third, environmental protection. Especially for medical and cosmetic containers, the masterbatch must meet environmental protection standards, non-toxic and harmless, without volatile substances.

For the blow molding field, the suitable Zhuoyue extruder series are ZTE series, HTS BASIC series and HTE series. For ordinary blow molding masterbatch (such as lubricating oil containers, plastic barrels), the ZTE series and HTS BASIC series are recommended. Their reasonable screw structure and temperature control system can ensure the good fluidity and stability of the masterbatch, meeting the basic requirements of blow molding products. For medium-grade blow molding masterbatch (such as cosmetic containers, beverage bottles), the HTE series is recommended. Its high production efficiency and energy-saving advantages can reduce production costs, and the good mixing and dispersing effect can ensure uniform coloring and dimensional stability of the product. For high-end blow molding masterbatch (such as medical containers), the HTS PLUS series and HTS SUPER series are recommended. Their high-precision temperature control and clean production design can ensure that the masterbatch meets medical grade standards, and the stable performance can ensure the dimensional accuracy and safety of the product.

4.4 Extrusion Molding Field: High Dimensional Stability and Wear Resistance Requirements

Masterbatch in the extrusion molding field is mainly used for coloring extrusion products, such as sheets, pipes, wires and cables, profiles, etc. The key requirements of this field for masterbatch are: first, high dimensional stability. Extrusion products (such as pipes, profiles) have strict requirements on dimensional accuracy, and the masterbatch must have stable performance, avoiding the deformation and color difference of the product due to uneven shrinkage; second, good wear resistance. For products such as pipes and wires and cables that need to withstand friction and extrusion, the masterbatch must have good wear resistance, ensuring the service life of the product; third, good weather resistance. For outdoor extrusion products (such as building profiles, outdoor pipes), the masterbatch must have good weather resistance, avoiding color fading and performance degradation under sunlight and rain.

For the extrusion molding field, the suitable Zhuoyue extruder series are HTS PLUS series, HTE series and HTS SUPER series. For ordinary extrusion masterbatch (such as indoor sheets, ordinary pipes), the HTE series and HTS BASIC series are recommended. Their good mixing and dispersing effect can ensure uniform coloring of the product, and the stable performance can ensure the dimensional accuracy of the product. For medium-grade extrusion masterbatch (such as wires and cables, building profiles), the HTS PLUS series is recommended. Its high-torque gearbox and wear-resistant screw/barrel can cope with the processing of high-hardness, high-viscosity masterbatch, ensuring the wear resistance and weather resistance of the product. For high-end extrusion masterbatch (such as high-temperature resistant pipes, outdoor high-grade profiles), the HTS SUPER series is recommended. Its ultra-high torque and precise temperature control can ensure the stable performance of the masterbatch, and the enhanced wear resistance can further extend the service life of the product.

4.5 Injection Molding Field: High Dispersibility and Batch Stability Requirements

Masterbatch in the injection molding field is the most widely used, mainly used for coloring injection molding products, such as automotive parts, electronic products, construction materials, home appliances, furniture, toys, etc. The requirements of this field for masterbatch are diverse, but the core requirements are: first, high dispersibility. Injection molding products have complex shapes and small sizes, and the masterbatch must have high dispersibility, avoiding color spots, color streaks and uneven coloring of the product; second, good batch stability. Injection molding products are usually produced in large batches, and the masterbatch must have stable performance, ensuring no color difference between batches of products; third, targeted functional requirements. For example, automotive parts require masterbatch with high temperature resistance and flame retardancy, electronic products require masterbatch with antistatic performance, and toys require masterbatch with non-toxic and environmental protection performance.

For the injection molding field, Zhuoyue’s full series of extruders can provide corresponding solutions according to different product levels. For ordinary injection molding masterbatch (such as toys, ordinary home appliances), the ZTE series and HTS BASIC series are recommended. Their cost-effective advantages can reduce production costs, and the basic mixing and dispersing effect can meet the requirements of ordinary products. For medium-grade injection molding masterbatch (such as electronic products, ordinary automotive parts), the HTE series and HTS PLUS series are recommended. Their high mixing and dispersing effect and batch stability can ensure the quality of the product, and the targeted functional masterbatch processing capacity can meet the special requirements of the product. For high-end injection molding masterbatch (such as high-grade automotive parts, precision electronic products), the HTS SUPER series is recommended. Its ultra-high dispersibility, batch stability and high-temperature resistance can meet the strict quality requirements of high-end products, and the intelligent control system can ensure the efficiency and stability of large-scale production.

5. Common Problems and Solutions in Masterbatch Twin-Screw Extrusion Processing

In the actual production process of masterbatch, due to the influence of raw materials, formula, processing parameters and equipment performance, various problems often occur, which affect the quality of masterbatch and production efficiency. Based on years of industry experience, Zhuoyue summarizes the common problems in masterbatch twin-screw extrusion processing, analyzes the causes in detail, and provides corresponding solutions, which can help manufacturers quickly solve production problems and improve production efficiency and product quality.

5.1 Common Problem 1: Poor Dispersibility of Masterbatch, Color Spots and Streaks in Products

This is the most common problem in masterbatch processing, which is mainly manifested in uneven coloring of the masterbatch, obvious pigment agglomerates, and color spots and streaks in the colored plastic products. The main causes and solutions are as follows:

5.1.1 Main Causes:

• (1) Raw material problems: The pigment particle size is too large, the agglomeration degree is high, and the drying is insufficient; the compatibility between the pigment and the carrier is poor; the dispersant dosage is insufficient or the type is improper.
• (2) Premixing problems: The mixing speed is too low, the mixing time is too short, the mixing temperature is improper, resulting in uneven premixing of raw materials.
• (3) Extrusion parameter problems: The screw speed is too low, the shear force is insufficient, and the pigment agglomerates cannot be fully broken; the extrusion temperature is too low, the carrier is not fully melted, and the pigment cannot be uniformly dispersed.
• (4) Equipment problems: The screw mixing elements are insufficient or worn; the barrel and screw are worn, resulting in reduced shear force; the die head is blocked, affecting the uniform extrusion of materials.

5.1.2 Solutions:

• (1) Optimize raw materials: Select pigments with small particle size and low agglomeration degree, and dry them thoroughly (moisture content ≤0.1%); select carriers compatible with pigments; replace appropriate dispersants and increase the dosage appropriately (within 1%-5% of the pigment dosage).
• (2) Improve premixing effect: Increase the mixing speed to 800-1200 rpm, extend the mixing time to 5-10 minutes, and control the mixing temperature at 40-60℃; for high-concentration masterbatch, add dispersant first and mix with pigment, then mix with carrier and other additives.
• (3) Adjust extrusion parameters: Increase the screw speed appropriately (500-800 rpm for high-concentration masterbatch), improve the shear force; increase the extrusion temperature appropriately to ensure that the carrier is fully melted (adjust according to the carrier type).
• (4) Maintain equipment: Replace worn screw mixing elements, barrel and screw; clean the die head regularly to avoid blockage; check the equipment regularly to ensure that the screw and barrel are properly matched.

5.2 Common Problem 2: Pigment Decomposition and Discoloration of Masterbatch

This problem is mainly manifested in the discoloration of the masterbatch (such as yellowing, darkening), the color is inconsistent with the standard sample, and even peculiar smell is generated. It is mostly caused by overheating of the material during extrusion processing, which is common in organic pigment masterbatch and engineering plastic masterbatch. The main causes and solutions are as follows:

5.2.1 Main Causes:

• (1) Extrusion temperature is too high: The temperature of the mixing section, homogenizing section or die head is too high, exceeding the heat resistance limit of the pigment or carrier.
• (2) The residence time of the material is too long: The screw speed is too low, the compression ratio is too large, resulting in the material staying in the extrusion cavity for too long (more than 3 minutes), and thermal decomposition occurs.
• (3) Poor heat dissipation of the equipment: The cooling system of the barrel fails, resulting in local overheating of the barrel.
• (4) Raw material problems: The heat resistance of the pigment is poor, or the carrier is easy to degrade at high temperature.

5.2.2 Solutions:

• (1) Adjust extrusion temperature: Reduce the temperature of the mixing section, homogenizing section and die head appropriately, and control it within the heat resistance range of the pigment and carrier (150-220℃ for ordinary masterbatch, 200-280℃ for engineering plastic masterbatch); check the temperature sensor regularly to ensure accurate temperature control.
• (2) Shorten the residence time: Increase the screw speed appropriately, reduce the compression ratio of the screw, and ensure that the residence time of the material in the extrusion cavity is 1-3 minutes.
• (3) Maintain the cooling system: Check the cooling water circulation system regularly, clean the cooling pipe, and ensure that the barrel can dissipate heat normally; replace the faulty cooling element in time.
• (4) Optimize raw materials: Select pigments with good heat resistance (such as inorganic pigments for high-temperature processing); select carriers with stable performance and not easy to degrade; add appropriate heat stabilizers (0.5%-3%) to prevent pigment decomposition and carrier degradation.

5.3 Common Problem 3: High Wear of Screw and Barrel, Short Service Life

This problem is common in the processing of white masterbatch, black masterbatch and filler masterbatch, which is mainly manifested in the rapid wear of the screw and barrel, reduced shear force and mixing capacity of the extruder, and increased maintenance cost. The main causes and solutions are as follows:

5.3.1 Main Causes:

• (1) Raw material problems: The pigment or filler has high hardness (such as titanium dioxide, carbon black, calcium carbonate), and the particle size is too large, which causes severe wear to the screw and barrel.
• (2) Extrusion parameter problems: The screw speed is too high, the shear force is too large, and the friction between the material and the screw/barrel is increased; the extrusion pressure is too high, which increases the wear of the screw and barrel.
• (3) Equipment problems: The screw and barrel are made of materials with poor wear resistance, or the processing technology is improper; the screw and barrel are not properly matched, resulting in uneven stress and increased wear.

5.3.2 Solutions:

• (1) Optimize raw materials: Select pigments or fillers with small particle size (20-40 mesh) and low hardness; crush and sieve the raw materials to remove large particles; add appropriate lubricants (0.5%-2%) to reduce the friction between the material and the screw/barrel.
• (2) Adjust extrusion parameters: Reduce the screw speed and extrusion pressure appropriately, and control the shear force within a reasonable range; avoid long-term high-speed and high-pressure operation of the equipment.
• (3) Select high-wear-resistant equipment: Select extruders with high-wear-resistant screws and barrels, such as Zhuoyue’s HTS PLUS, HTS SUPER and HTE series, whose screws and barrels are made of imported wear-resistant alloy steel and undergo bimetallic composite or laser cladding treatment, which can greatly improve the service life; regularly check the wear of the screw and barrel, and replace them in time when the wear is serious.

5.4 Common Problem 4: Instability of Product Quality Between Batches, Color Difference

This problem is mainly manifested in the inconsistency of masterbatch quality (such as concentration, dispersibility, color) between different batches, resulting in color difference of downstream products, which affects the reputation of the manufacturer. The main causes and solutions are as follows:

5.4.1 Main Causes:

• (1) Formula problem: The formula ratio is not strictly controlled, and the dosage of pigment, dispersant and other additives fluctuates (error exceeds ±1%).
• (2) Raw material problem: The performance of raw materials (such as pigment tinting strength, carrier melting point) of different batches is inconsistent.
• (3) Processing parameter problem: The extrusion temperature, screw speed, feeding speed and other parameters fluctuate between different batches, resulting in inconsistent processing effect.
• (4) Equipment problem: The equipment has poor stability, and the parameters (such as temperature, pressure) cannot be kept stable for a long time.

5.4.2 Solutions:

• (1) Strictly control the formula ratio: Use high-precision weighing equipment to weigh raw materials, and the error is controlled within ±1%; establish a formula management system, and record the dosage of each raw material in detail.
• (2) Standardize raw material procurement and inspection: Select raw material suppliers with stable quality, and inspect the performance of raw materials (such as tinting strength, particle size, moisture content) before use; for raw materials of different batches, conduct trial production first to ensure consistent performance.
• (3) Standardize processing parameters: Use an intelligent control system (such as Zhuoyue’s PLC control system) to store the processing parameters of different masterbatch, and call the corresponding parameters when producing different batches, avoiding repeated debugging; regularly check the equipment parameters to ensure stable operation.
• (4) Establish quality inspection system: Conduct strict quality inspection on each batch of masterbatch, including color, dispersibility, concentration and other indicators, and only deliver the products that meet the standards.

5.5 Common Problem 5: Poor Processing Fluidity of Masterbatch, Difficult Extrusion, Equipment Blockage

This problem is mainly manifested in the difficulty of material conveying and extrusion, low production efficiency, unstable extrusion pressure, and even blockage of the die head and extrusion cavity, which affects the normal production. The main causes and solutions are as follows:

5.5.1 Main Causes:

• (1) Raw material problem: The carrier has poor fluidity, or the pigment content is too high (more than 80%), resulting in poor fluidity of the mixture; the raw material has high moisture content, which causes the material to agglomerate and block the feeding port.
• (2) Premixing problem: The premixing is uneven, and the dispersant is not fully mixed, resulting in poor fluidity of the material.
• (3) Extrusion parameter problem: The extrusion temperature is too low, the carrier is not fully melted, and the fluidity is poor; the screw speed is too low, the conveying capacity is insufficient; the die head hole is too small, and the extrusion resistance is too large.
• (4) Equipment problem: The screw conveying elements are worn, the conveying capacity is reduced; the feeding device fails, resulting in uneven feeding.

5.5.2 Solutions:

• (1) Optimize raw materials: Select carriers with good fluidity; reduce the pigment content appropriately (control within 80%); dry the raw materials thoroughly to control the moisture content below 0.1%.
• (2) Improve premixing effect: Extend the premixing time, increase the mixing speed, ensure that the dispersant is fully mixed with the pigment and carrier, and improve the fluidity of the mixture.
• (3) Adjust extrusion parameters: Increase the extrusion temperature appropriately to ensure that the carrier is fully melted; increase the screw speed to improve the conveying capacity; replace the die head with larger die holes to reduce extrusion resistance.
• (4) Maintain equipment: Replace worn screw conveying elements; check the feeding device regularly, and repair or replace the faulty parts in time; clean the feeding port and extrusion cavity regularly to avoid material accumulation and blockage.

6. Practical Application Cases of Zhuoyue Extruders in Masterbatch Processing

To further verify the performance advantages and application effects of Zhuoyue’s full series of extruders in masterbatch processing, this section will introduce several practical application cases, covering different masterbatch types, production scales and application fields. These cases fully demonstrate that Zhuoyue’s extruders can provide targeted and efficient processing solutions for different manufacturers, helping manufacturers improve production efficiency, product quality and market competitiveness.

6.1 Case 1: Application of HTS SUPER Series in High-Concentration Black Masterbatch Processing for New Energy Vehicles

Customer Background: A large-scale masterbatch manufacturer in Jiangsu, China, mainly produces high-end functional masterbatch, focusing on the new energy vehicle field. The customer needs to produce high-concentration black masterbatch (carbon black content 70%) for automotive battery shell parts. The masterbatch requires ultra-high dispersibility (no black spots and streaks in the product), high temperature resistance (can withstand 200℃ high temperature without discoloration), and good batch stability. The customer’s original equipment has problems such as insufficient mixing and dispersing effect, unstable temperature control, and low production efficiency, which cannot meet the production requirements.

Solution: Zhuoyue recommends the HTS SUPER series twin-screw extruders (screw diameter 75mm) for the customer. This series adopts ultra-high torque gearboxes and laser-clad wear-resistant screws/barrels, which can provide strong shear force and wear resistance, effectively solving the problem of carbon black agglomeration; the 6-section precise temperature control system (temperature control precision ±1℃) can accurately control the extrusion temperature, avoiding carbon black decomposition; the multi-stage mixing screw combination ensures that the carbon black is uniformly dispersed in the PE carrier; the intelligent cloud control system can realize remote parameter adjustment and data monitoring, ensuring batch stability.

Application Effect: After using the HTS SUPER series extruders, the customer’s high-concentration black masterbatch has achieved ultra-high dispersibility, and the colored battery shell parts have no black spots and streaks, which meets the strict requirements of new energy vehicle manufacturers; the high temperature resistance of the masterbatch has been significantly improved, and no discoloration occurs at 200℃; the production efficiency has increased from 500kg/h to 1200kg/h, and the energy consumption has decreased by 22%; the batch stability of the masterbatch has been greatly improved, and the color difference between batches is less than 0.5, which has won high recognition from downstream customers. The customer has successively purchased 8 sets of HTS SUPER series extruders, forming a large-scale production line.

6.2 Case 2: Application of HTS PLUS Series in Engineering Plastic PA Masterbatch Processing

Customer Background: A medium-sized masterbatch manufacturer in Guangdong, China, mainly produces engineering plastic masterbatch, focusing on the automotive and electronic fields. The customer needs to produce PA66 masterbatch (pigment content 50%) for automotive connector parts. The masterbatch requires good dispersibility, high temperature resistance (260℃), and good compatibility with PA66 raw materials. The customer’s original equipment has problems such as poor wear resistance of the screw/barrel, insufficient torque, and easy decomposition of PA66 carrier, which affects the product quality.

Solution: Zhuoyue recommends the HTS PLUS series twin-screw extruders (screw diameter 65mm) for the customer. This series adopts high-torque gearboxes independently developed by Zhuoyue, which can provide sufficient torque for PA66 masterbatch processing; the bimetallic composite screw/barrel has excellent wear resistance and corrosion resistance, which can cope with the wear of high-hardness pigments; the 5-section precise temperature control system and vacuum exhaust device can avoid PA66 carrier decomposition and remove moisture and volatile substances, ensuring the quality of the masterbatch; the modular screw design can be flexibly configured according to the PA66 masterbatch processing characteristics, improving the mixing and dispersing effect.

Application Effect: After using the HTS PLUS series extruders, the customer’s PA66 masterbatch has good dispersibility, and the automotive connector parts have uniform coloring and no color spots; the masterbatch can withstand 260℃ high temperature without decomposition and discoloration, and has good compatibility with PA66 raw materials; the service life of the screw/barrel has increased from 6 months to 18 months, reducing the maintenance cost by 60%; the production efficiency has increased from 300kg/h to 800kg/h, and the product qualification rate has increased from 92% to 99%. The customer’s PA66 masterbatch has successfully entered the supply chain of a well-known automotive parts manufacturer.

6.3 Case 3: Application of HTE Series in Cost-Effective Film Masterbatch Processing

Customer Background: A small and medium-sized masterbatch manufacturer in Zhejiang, China, mainly produces film masterbatch, focusing on the packaging film field. The customer needs to produce PE film masterbatch (pigment content 40%) for food packaging films. The masterbatch requires good transparency, uniform coloring, and low production cost. The customer’s original equipment has problems such as high energy consumption, unstable product quality, and low production efficiency, which cannot meet the market competition needs.

Solution: Zhuoyue recommends the HTE series twin-screw extruders (screw diameter 50mm) for the customer. This series integrates high performance and cost-effectiveness, adopts high-efficiency energy-saving motors and optimized screw structures, which can reduce energy consumption by 18%-25%; the precise temperature control system ensures that the PE carrier is fully melted, avoiding affecting the transparency of the masterbatch; the enhanced mixing elements ensure uniform coloring of the masterbatch, and the stable performance ensures batch consistency; the reasonable price and low maintenance cost can help the customer reduce production costs.

Application Effect: After using the HTE series extruders, the customer’s PE film masterbatch has good transparency and uniform coloring, and the food packaging films produced have smooth surface and no color spots, which meets the food packaging standards; the energy consumption per ton of masterbatch has decreased by 20%, and the production efficiency has increased from 150kg/h to 400kg/h; the product qualification rate has increased from 90% to 98%, and the production cost has decreased by 15%. The customer’s market competitiveness has been significantly improved, and the order volume has increased by 40% within half a year. The customer has purchased 4 sets of HTE series extruders to expand production scale.

6.4 Case 4: Application of ZTE Series in Small-Batch Multi-Variety Ordinary Masterbatch Processing

Customer Background: A small masterbatch manufacturer in Shandong, China, mainly produces small-batch multi-variety ordinary masterbatch (PE/PP color masterbatch, black masterbatch, white masterbatch), focusing on the local plastic product processing market. The customer has limited budget, small production scale, and needs to produce multiple types of masterbatch with small batches (50-100kg per batch). The customer’s requirements for the equipment are simple operation, low maintenance cost, and strong adaptability.

Solution: Zhuoyue recommends the ZTE series twin-screw extruders (screw diameter 35mm) for the customer. This series has excellent cost performance, simple structure and easy operation, which is suitable for operators with little experience; the modular screw design can be flexibly adjusted according to different types of masterbatch, with strong adaptability; the wear-resistant screw/barrel and stable temperature control system can meet the basic processing requirements of ordinary masterbatch; the low energy consumption and low maintenance cost can help the customer reduce the initial investment and daily operation costs.

Application Effect: After using the ZTE series extruders, the customer can flexibly produce multiple types of ordinary masterbatch, and the product quality meets the basic requirements of local plastic product manufacturers; the equipment operation is simple, and the operator can master it quickly; the maintenance cost is low, and the annual maintenance cost is less than 5000 yuan; the production efficiency can meet the small-batch production needs (50-200kg/h). The ZTE series extruders have helped the customer stabilize the local market and lay a foundation for future expansion.

7. Future Development Trend of Masterbatch and Twin-Screw Extrusion Technology

With the continuous development of the global plastics industry, the upgrading of environmental protection policies and the diversification of downstream market demand, the masterbatch industry and twin-screw extrusion technology are facing new development opportunities and challenges. The future development trend will focus on environmental protection, functionalization, intelligence and high efficiency, and Zhuoyue will continue to focus on technological innovation, keep up with the industry trend, and provide more advanced and efficient processing solutions for masterbatch manufacturers.

7.1 Development Trend of Masterbatch Industry

7.1.1 In-depth Development of Environmental Protection and Low Toxicity.

With the strengthening of global environmental protection awareness and the strictness of environmental protection policies (such as the European Union’s REACH directive, China’s “double carbon” goal), environmental protection masterbatch will become the mainstream of the market. The future environmental protection masterbatch will focus on non-toxic, harmless, low-volatile, degradable and recyclable, and toxic and harmful pigments (such as heavy metal pigments) and additives will be completely eliminated. For example, water-based masterbatch, bio-based masterbatch and recyclable masterbatch will have broad market prospects. At the same time, the recycling of masterbatch waste will also become an important development direction, which can reduce resource waste and environmental pollution.

7.1.2 Functional Integration and High Performance.

With the diversification of downstream product requirements, masterbatch will develop towards functional integration, that is, integrating multiple functions (such as coloring, flame retardant, antistatic, antibacterial, UV-resistant) into one masterbatch, which can reduce the addition amount of masterbatch, simplify the processing process, and reduce production costs. For example, new energy vehicle masterbatch will integrate high temperature resistance, flame retardant, antistatic and other functions; medical masterbatch will integrate non-toxic, antibacterial, high transparency and other functions. In addition, high-performance masterbatch (such as high-concentration, high-dispersibility, high-temperature resistant, corrosion-resistant masterbatch) will be more widely used in high-end fields such as aerospace, precision electronics and new energy.

7.1.3 Customization and Personalization.

With the upgrading of downstream market demand, the customization and personalization of masterbatch will become more and more prominent. Different downstream manufacturers have different requirements on masterbatch (such as color, concentration, function, carrier type), and masterbatch manufacturers need to provide personalized customization solutions according to the specific needs of customers. For example, according to the color sample provided by the customer, customize the masterbatch with matching color; according to the special use environment of the product, customize the masterbatch with targeted functions. This requires masterbatch manufacturers to have strong R&D capabilities and flexible production capacity.

7.2 Development Trend of Twin-Screw Extrusion Technology

7.2.1 Intelligence and Automation Upgrading.

The future twin-screw extruders will develop towards higher intelligence and automation. The intelligent control system will integrate AI, big data, Internet of Things and other technologies, which can realize real-time monitoring, automatic parameter adjustment, fault early warning, predictive maintenance and production data analysis of the extrusion process. For example, the AI system can automatically adjust the screw speed, extrusion temperature and feeding speed according to the raw material performance and processing effect, ensuring the stability of product quality; the Internet of Things technology can realize the interconnection of multiple extruders, realizing centralized management and intelligent scheduling of the production line; the big data system can analyze the production data, optimize the processing parameters and formula, and improve production efficiency and product quality.

7.2.2 High Efficiency, Energy Saving and Environmental Protection.

High efficiency, energy saving and environmental protection will continue to be the key development direction of twin-screw extrusion technology. The future extruders will adopt more advanced screw structures, high-efficiency energy-saving motors and heating/cooling systems, which can further reduce energy consumption and improve production efficiency. For example, the optimized screw structure can reduce the shear loss and improve the conveying efficiency; the high-efficiency energy-saving motor can reduce the energy consumption by 25%以上 compared with the traditional motor; the closed structure and waste gas treatment system can reduce the emission of dust and volatile substances, meeting the higher environmental protection requirements.

7.2.3 High Performance and Wear Resistance.

With the development of high-concentration, high-hardness masterbatch (such as filler masterbatch, engineering plastic masterbatch), the requirements for the performance and wear resistance of twin-screw extruders will be higher. The future extruders will adopt more high-performance wear-resistant materials (such as new alloy steel, ceramic materials) and advanced manufacturing technologies (such as laser cladding, bimetallic composite), which can greatly improve the wear resistance and corrosion resistance of the screw and barrel, extend the service life of the equipment. At the same time, the extruders will be equipped with higher torque gearboxes and more advanced mixing elements, which can provide stronger shear force and kneading force, meeting the processing needs of high-performance masterbatch.

7.2.4 Modularization and Flexibility.

Modularization and flexibility will become an important development trend of twin-screw extruders. The future extruders will adopt a more perfect modular design, and the screw, barrel, die head and other components can be freely combined and replaced according to the type of masterbatch and processing requirements, which can improve the adaptability of the equipment and reduce the investment cost of the customer. For example, when producing different types of masterbatch, only the corresponding screw elements and die head need to be replaced, without replacing the entire extruder. In addition, the small and medium-sized modular extruders will be more popular, which can meet the small-batch and multi-variety production needs of small and medium-sized manufacturers.

7.3 Zhuoyue’s Layout in the Future Development Trend

Facing the future development trend of the masterbatch industry and twin-screw extrusion technology, Zhuoyue will focus on technological innovation and product upgrading, and make layout in the following aspects: first, strengthen the R&D of intelligent extrusion technology, integrate AI, big data and Internet of Things technologies into the extruder design, launch more intelligent and automatic extruders, and help customers realize intelligent production; second, increase the R&D investment in high-performance wear-resistant materials and energy-saving technologies, develop more efficient, energy-saving and wear-resistant extruders, reduce the production cost and environmental impact of customers; third, strengthen the R&D of customized solutions, according to the personalized needs of different customers, provide targeted extruder configuration and processing solutions, and improve customer satisfaction; fourth, expand the R&D of environmental protection masterbatch processing technology, launch extruders suitable for water-based masterbatch, bio-based masterbatch and recyclable masterbatch processing, and help the masterbatch industry achieve green development.

8. Conclusion

Masterbatch, as the core material of plastic coloring and functional modification, plays an indispensable role in the global plastics industry. Twin-screw extrusion technology, as the key processing technology of masterbatch, directly determines the quality, production efficiency and market competitiveness of masterbatch products. With the continuous development of the masterbatch industry towards environmental protection, functionalization, high concentration and intelligence, the requirements for twin-screw extruders are becoming higher and higher.

Zhuoyue, as a professional manufacturer of twin-screw extruders, has launched a full series of extruders (HTS BASIC/PLUS/SUPER, ZTE, HTE) specially designed for masterbatch processing, each series has its own unique performance characteristics and targeted adaptation scenarios, which can provide personalized and efficient processing solutions for masterbatch manufacturers of different scales and fields. These extruders have the advantages of excellent mixing and dispersing effect, precise temperature control, high wear resistance, high production efficiency, energy saving and environmental protection, intelligent control and wide application range, which have been fully verified in many practical application cases.

This article comprehensively elaborates on the core knowledge of masterbatch, the principle and process of twin-screw extrusion technology, the performance advantages of Zhuoyue’s full series of extruders, the application fields of masterbatch, common problems and solutions in processing, practical application cases, and the future development trend. It is hoped that this article can provide comprehensive and professional reference for masterbatch manufacturers, processing technicians, industry practitioners and relevant researchers.

In the future, Zhuoyue will continue to adhere to the concept of technological innovation and customer-oriented, keep up with the development trend of the industry, continuously upgrade products and technologies, provide more advanced, efficient and environmentally friendly twin-screw extrusion solutions, and work together with masterbatch manufacturers around the world to promote the high-quality development of the masterbatch industry.