In 'n era van toenemende omgewingsbewustheid en streng hulpbronbewaringsbeleid, plastiekherwinning het 'n kritieke fokus vir nywerhede wêreldwyd geword. Onder die verskillende plastiekherwinningstegnologieë, afval plastiek herwinning granulering staan uit as 'n praktiese, doeltreffend, en ekonomies lewensvatbare metode wat weggooide plastiekmateriaal in herbruikbare korrels omskep. Hierdie herwonne korrels kan verder verwerk word tot nuwe plastiekprodukte, met werkverrigtingsvlakke wat vergelykbaar is met dié wat van ongekunstelde materiale gemaak word, om sodoende ware hulpbronsirkulasie te verwesenlik en die omgewingslas wat deur plastiekafval veroorsaak word, te verminder.
Zhuoyue, 'n toonaangewende vervaardiger van ekstrusietoerusting, is daartoe verbind om omvattende herwinningsgranulasie-produksielyne vir alle soorte afvalplastiek te verskaf, insluitend PP (Polipropileen), PE (Poliëtileen), LDPE (Lae-digtheid poliëtileen), PET (Poliëtileentereftalaat), PS (Polistireen), ABS (Akrielnitril Butadieen Styreen), en meer. Met gevorderde ekstrusietegnologie en diepgaande kundigheid in plastiekherwinning, Zhuoyue se ekstrueerders is aangepas om die unieke uitdagings van afvalplastiekgranulering die hoof te bied, doeltreffend te lewer, energiebesparend, en oplossings van hoë gehalte vir ondernemings wat by plastiekherwinning betrokke is.
1. 'n Oorsig van Afval Plastiek Herwinning Granulasie
Afvalplastiekherwinninggranulering is 'n gespesialiseerde proses wat verskillende vorme van afvalplastiek omskep—soos plastiekbottels, films, houers, afval van produksielyne, en plastiekafval na verbruikers—in uniform, plastiekkorrels van hoë gehalte deur 'n reeks meganiese en termiese behandelings. Hierdie herwonne korrels, ook bekend as hergranulate of herverwerkte plastiekkorrels, kan direk in spuitgiet gebruik word, ekstrusie, blaasvorming, en ander plastiekverwerkingsmetodes om nuwe produkte te vervaardig, wat wissel van verpakkingsmateriaal en konstruksiekomponente tot motoronderdele en daaglikse benodigdhede.
Die kernwaarde van afvalplastiekherwinninggranulering lê in die vermoë daarvan om die dubbele uitdagings van plastiekafvalverwydering en hulpbronskaarste aan te spreek. Anders as tradisionele afvalplastiekwegdoeningsmetodes soos storting en verbranding, wat ernstige omgewingsrisiko's inhou, herwinning granulering bereik ware hulpbron herwinning:
- Omgewingsbeskerming: Die storting van plastiekafval beslaan waardevolle grondbronne en kan tot grond- en grondwaterbesoedeling lei, aangesien plastiek nie-bioafbreekbaar is en mettertyd skadelike stowwe kan vrystel. Verbranding, aan die ander kant, giftige gasse vrystel (soos dioksiene en koolstofmonoksied) en deeltjies, bydra tot lugbesoedeling en aardverwarming. Herwinning van granulering verminder die hoeveelheid plastiekafval wat stortingsterreine en verbrandingsoonde binnegaan, die vermindering van omgewingsbesoedeling en koolstofvrystellings.
- Hulpbronbewaring: Plastiek word van nie-hernubare fossielbrandstowwe verkry (soos olie en aardgas). Deur afvalplastiek in herbruikbare korrels te herwin, die vraag na maagdelike plastiekmateriale word verminder, die behoud van waardevolle fossielhulpbronne en die vermindering van die energieverbruik wat verband hou met die vervaardiging van ongerepte plastiek. Daar word beraam dat die herwinning van een ton plastiek kan bespaar tot 7.4 vate olie en verminder koolstofvrystellings deur 1.5 ton.
- Ekonomiese voordele: Herwonne plastiekkorrels is aansienlik goedkoper as maagdelike plastiekmateriaal, aansienlike kostebesparings vir vervaardigers bied. Vir herwinningsondernemings, die proses van versameling, verwerking, en die granuleer van afvalplastiek kan stabiele winste genereer, nuwe ekonomiese geleenthede en werksposisies te skep. Daarbenewens, baie lande en streke bied beleidsaansporings (soos subsidies en belastingtoegewings) vir plastiekherwinningsondernemings, die ekonomiese lewensvatbaarheid van herwinning van granulasie verder te verbeter.
Egter, die kwaliteit van herwonne plastiekkorrels en die prestasie van die finale herwinde produkte is hoogs afhanklik van die granuleringsproses en toerusting wat gebruik word. Faktore soos die tipe en suiwerheid van afvalplastiek, die doeltreffendheid van sortering en skoonmaak, die temperatuur en skuifbeheer tydens ekstrusie, en die ontwerp van die ekstruder het almal 'n beduidende impak op die finale produkkwaliteit. Daarom, die ontwikkeling van 'n eenvoudige, gerieflik, doeltreffend, energiebesparend, omgewingsvriendelik, en ekonomies lewensvatbare granuleringsproses het die fokus geword van navorsing en ontwikkeling in die plastiekherwinningsbedryf.
1.1 Sleutelkenmerke van herwinde plastiekkorrels
Die prestasie van herwonne plastiekkorrels is nou verwant aan die tipe afvalplastiek, die mate van kontaminasie, en die granuleringsproses. In die algemeen, hoë kwaliteit herwonne korrels moet die volgende eienskappe besit:
- Eenvormige deeltjiegrootte: Konsekwente deeltjiegrootte verseker stabiele voeding tydens daaropvolgende verwerking (soos spuitgiet en ekstrusie), die eenvormigheid en kwaliteit van die finale produk te verbeter. Die deeltjiegrootte van herwonne korrels is tipies tussen 2 mm en 5 mm, afhangende van die toepassingsvereistes.
- Lae kontaminasie: Kontaminante soos vuilheid, stof, metaal fragmente, papier, en ander nie-plastiese materiale kan die werkverrigting van herwonne korrels en die finale produk aansienlik beïnvloed. Daarom, doeltreffende sortering en skoonmaak van afvalplastiek is noodsaaklik om lae kontaminasievlakke te verseker.
- Goeie plastisiteit en verwerkbaarheid: Herwinde korrels moet goeie smelteienskappe en vloeibaarheid hê, wat maklike verwerking in nuwe produkte moontlik maak sonder om die verwerkingsdoeltreffendheid of produkkwaliteit te beïnvloed. Dit vereis presiese beheer van die temperatuur en skuiftempo tydens die granuleringsproses om oormatige agteruitgang van die plastiese molekulêre struktuur te vermy.
- Stabiele meganiese eienskappe: Die treksterkte, verlenging by breek, impak sterkte, en ander meganiese eienskappe van herwonne korrels moet so na as moontlik aan dié van maagdelike materiale wees, verseker dat die finale herwonne produkte aan die vereiste prestasiestandaarde voldoen.
- Lae voginhoud: Hoë voginhoud in herwonne korrels kan lei tot defekte soos borrels en krake in die finale produk tydens verwerking. Daarom, droogstappe word dikwels tydens die granuleringsproses vereis om die voginhoud tot 'n aanvaarbare vlak te verminder (tipies hieronder 0.5%).
1.2 Algemene tipes afvalplastiek vir granulering
Byna alle soorte termoplastiese plastiek kan herwin en gegranuleer word, terwyl termohardende plastiek (wat nie gesmelt en herverwerk kan word nie) is nie geskik vir herwinning van granulasie nie. Die mees algemene tipes afvalplastiek wat in herwinning van granulasie gebruik word, sluit in:
- PP (Polipropileen): 'n Algemene termoplast met goeie chemiese weerstand, meganiese eienskappe, en verwerkbaarheid. Algemene afval PP sluit plastiekemmers in, houers, pette, en produksie-afval. Herwinde PP-korrels word dikwels gebruik om plastiekpype te vervaardig, motoronderdele, en verpakkingsmateriaal.
- PE (Poliëtileen): Verdeel in LDPE (Lae-digtheid poliëtileen) en HDPE (Hoë-digtheid poliëtileen). LDPE word algemeen in plastiekfilms gebruik, sakke, en bottels, terwyl HDPE in vate gebruik word, pype, en houers. Herwinde PE-korrels is geskik vir die vervaardiging van plastiekfilms, pype, en spuitgevormde produkte.
- PET (Poliëtileentereftalaat): 'n Deursigtige, stewige plastiek wat algemeen in drankbottels gebruik word, voedselverpakking, en veselprodukte. Herwinde PET-korrels word wyd gebruik in die vervaardiging van poliëstervesels, plastiekbottels, en verpakkingsmateriaal.
- PS (Polistireen): Beskikbaar in rigied (soos skuimbekers, kos houers, en plastiek speelgoed) en skuim (VPA, uitgebreide polistireen) vorms. Herwinde PS-korrels kan gebruik word om plastiekspeelgoed te vervaardig, dekoratiewe materiale, en skuim produkte.
- ABS (Akrielnitril Butadieen Styreen): ’n Hoëprestasie-plastiek met goeie slagsterkte, rigiditeit, en hittebestandheid. Algemene afval-ABS sluit plastiekdoppies van elektroniese produkte in, motoronderdele, en speelgoed. Herwinde ABS-korrels word gebruik om elektroniese produkdoppe te vervaardig, motoronderdele, en spuitgegote komponente.
Zhuoyue se herwinningsgranulasie-produksielyne is ontwerp om al die bogenoemde afvalplastiek te hanteer, met pasgemaakte toerustingkonfigurasies om aan die spesifieke verwerkingsvereistes van verskillende plastiektipes te voldoen.
2. Die Afval Plastiek Herwinning Granulasie proses
Die granulasieproses vir afvalplastiekherwinning bestaan tipies uit verskeie sleutelstappe: versameling en sortering van afvalplastiek, skoonmaak, verpletterend, droogmaak, ekstrusie granulasie, verkoeling, en sny. Elke stap speel 'n deurslaggewende rol in die versekering van die kwaliteit van die finale herwonne korrels. Die spesifieke prosesparameters kan verskil na gelang van die tipe afvalplastiek, die mate van kontaminasie, en die verlangde kwaliteit van die herwonne korrels.
2.1 Versameling en sortering
Die eerste stap in die herwinninggranuleringsproses is die versameling en sortering van afvalplastiek. Afvalplastiek word uit verskeie bronne versamel, insluitend huishoudings, nywerhede, kommersiële inrigtings, en produksielyne. As gevolg van die wye verskeidenheid van afvalplastiek en die teenwoordigheid van kontaminante, sortering is noodsaaklik om die kwaliteit van die herwonne korrels te verseker.
Sortering kan met die hand of meganies gedoen word. Handmatige sortering is geskik vir kleinskaalse herwinningsbedrywighede en behels die skei van verskillende soorte plastiek, verwydering van nie-plastiese kontaminante (soos metaal, papier, glas, en organiese afval), en sorteer plastiek volgens kleur en kwaliteit. Meganiese sortering, aan die ander kant, is meer doeltreffend en geskik vir grootskaalse bedrywighede, die gebruik van tegnologieë soos digtheidskeiding (wasbak-dryf skeiding), magnetiese skeiding, elektrostatiese skeiding, en infrarooi sortering om verskillende plastiektipes te skei en kontaminante te verwyder.
Effektiewe sortering is van kritieke belang omdat die vermenging van verskillende soorte plastiek kan lei tot 'n aansienlike vermindering in die werkverrigting van die herwonne korrels. Byvoorbeeld, die vermenging van PP en PET kan faseskeiding tydens ekstrusie veroorsaak, wat lei tot swak plastisiteit en meganiese eienskappe van die korrels.
2.2 Skoonmaak
Na sortering, die afvalplastiek word skoongemaak om oppervlakbesoedeling soos vuil te verwyder, stof, olie, smeer, voedselreste, en etikette. Die skoonmaakproses behels gewoonlik verskeie stappe:
- Voorskoonmaak: Verwydering van groot kontaminante (soos etikette, pette, en metaalfragmente) en growwe vuiligheid deur borsel, blaas, of handmatige pluk.
- Wasgoed: Week die afvalplastiek in 'n skoonmaakoplossing (gewoonlik water met skoonmaakmiddel of alkali) olie te verwyder, smeer, en voedselreste. Roering of ultrasoniese skoonmaak kan gebruik word om die skoonmaak effek te verbeter.
- Spoel: Spoel die skoongemaakte plastiek met skoon water om enige oorblywende skoonmaakoplossing en kontaminante te verwyder.
- Ontwatering: Verwyder oortollige water uit die skoongemaakte plastiek met behulp van sentrifuges, ontwateringsmasjiene, of lugdroog om die voginhoud te verminder en daaropvolgende verwerking te vergemaklik.
Die skoonmaak-effek beïnvloed die kwaliteit van die herwonne korrels direk. Onvoldoende skoonmaak kan lei tot kontaminasie van die korrels, wat hul verwerkbaarheid en meganiese eienskappe beïnvloed. Byvoorbeeld, olie- en vetreste kan swak adhesie tussen die plastiekmolekules tydens ekstrusie veroorsaak, wat lei tot lae treksterkte van die korrels.
2.3 Verpletterend
Na skoonmaak en ontwatering, die afvalplastiek word in klein stukkies fyngemaak (vlokkies of fragmente) met behulp van 'n breker. Verplettering help om die oppervlak van die plastiek te vergroot, fasiliteer smelt en vermenging tydens die ekstrusieproses. Dit help ook om enige oorblywende klein kontaminante wat in die plastiek ingebed kan wees, te verwyder.
Die tipe breker wat gebruik word, hang af van die tipe en vorm van die afvalplastiek. Algemene tipes brekers sluit kakebeenbrekers in, hamerbrekers, blade crushers, and granulators. For flexible plastics (such as plastic films and bags), blade crushers are typically used, while for rigid plastics (such as plastic bottles and containers), hammer crushers or jaw crushers are more suitable. The size of the crushed plastic pieces is usually between 5mm and 20mm, depending on the type of extruder used and the desired granule size.
2.4 Droog
Even after dewatering, the crushed plastic pieces may still contain a certain amount of moisture. High moisture content can lead to defects such as bubbles, cracks, and poor surface quality in the recycled granules during extrusion. Daarom, a drying step is necessary to reduce the moisture content of the crushed plastic pieces to an acceptable level (tipies hieronder 0.5%).
Common drying methods include hot air drying, vacuum drying, and infrared drying. Warm lug droog is die mees gebruikte metode, wat die deurlaat van warm lug behels (by 'n temperatuur van 80-120°C) deur die fyngemaakte plastiekstukke om die vog te verdamp. Die droogtyd en temperatuur hang af van die tipe plastiek en die aanvanklike voginhoud. Byvoorbeeld, PET is meer sensitief vir vog en vereis hoër droogtemperature (120-160°C) en langer droogtye om volledige vogverwydering te verseker.
2.5 Ekstrusie Granulasie
Ekstrusiegranulering is die kernstap in die granulasieproses vir afvalplastiekherwinning. Dit behels smelting, vermenging, en homogenisering van die gedroogde fyngemaakte plastiekstukke met 'n ekstruder, Ekstrusie dan die gesmelte plastiek deur 'n matrys om aaneenlopende stringe te vorm, wat daarna afgekoel en in eenvormige korrels gesny word.
Die ekstruder is die sleuteltoerusting in hierdie stap, and its performance directly determines the quality and efficiency of the granulation process. There are two main types of extruders used in waste plastic recycling granulation: twin-screw extruders and single-screw extruders. Each type has its own advantages and is suitable for different types of waste plastics, as detailed in Section 3.
During extrusion granulation, several key process parameters need to be precisely controlled:
- Temperatuur: The temperature of the extruder barrel and die is critical for melting the plastic and ensuring good mixing and homogenization. Different types of plastics have different melting points, and the barrel temperature is typically set 10-30°C above the melting point of the plastic to ensure complete melting. Byvoorbeeld, the barrel temperature for PP is usually 170-220°C, terwyl dit vir PET 260-280°C is. Oormatige hoë temperature kan termiese agteruitgang van die plastiek veroorsaak, lei tot 'n vermindering in die meganiese eienskappe van die herwonne korrels, terwyl buitensporige lae temperature tot onvolledige smelting en swak vermenging kan lei.
- Skuifkoers: Die skuiftempo word bepaal deur die skroefspoed en die skroefontwerp. ’n Geskikte skuiftempo help om die gesmelte plastiek te homogeniseer, versprei enige oorblywende kontaminante, en verbeter die plastisiteit van die korrels. Egter, buitensporige hoë skuiftempo's kan meganiese agteruitgang van die plastiese molekulêre struktuur veroorsaak, lei tot verminderde prestasie.
- Skroef spoed: Die skroefspoed beïnvloed die deurset, smelt doeltreffendheid, en mengkwaliteit. Hoër skroefspoed kan die deurset verhoog, maar kan die smelt- en mengdoeltreffendheid verminder, terwyl laer skroefspoed die mengkwaliteit kan verbeter, maar die deurset kan verminder. Die optimale skroefspoed hang af van die tipe plastiek, die ekstruder tipe, en die verlangde korrelkwaliteit.
- Ekstrusie druk: Die ekstrusiedruk word bepaal deur die matrysontwerp, skroef spoed, en materiaalviskositeit. Stabiele ekstrusiedruk verseker eenvormige stringvorming en konsekwente korrelgrootte. Oormatige druk kan die blokkasie veroorsaak, terwyl oormatige lae druk ongelyke stringe tot gevolg kan hê.
2.6 Verkoeling en sny
Na ekstrusie deur die matrys, die aaneenlopende plastiekstringe word afgekoel om dit te stol. Verkoeling kan gedoen word deur lugverkoeling of waterverkoeling te gebruik. Waterverkoeling is meer doeltreffend en word wyd gebruik in grootskaalse granuleringsbedrywighede, wat behels dat die drade deur 'n watertenk of watersproei gestuur word om dit vinnig tot kamertemperatuur af te koel. Lugverkoeling is geskik vir kleinskaalse bedrywighede of vir plastiek wat sensitief is vir water (soos sommige ingenieursplastiek).
Sodra die stringe afgekoel en gestol is, hulle word in eenvormige korrels gesny met 'n pelletiseerder. Die pelletiseerder word tipies by die uitgang van die verkoelingstelsel geïnstalleer en kan verstel word om die lengte van die korrels te beheer (gewoonlik tussen 2mm en 5mm). Algemene tipes pelletiseerders sluit in string pelletizers, waterringkorrels, en onderwater pelletiseerders. Strand pelletizers is die mees gebruikte tipe vir afvalplastiek herwinning granulering, aangesien hulle eenvoudig in struktuur is, maklik om te bedryf, en geskik vir die meeste soorte plastiek.
2.7 Sifting en verpakking
Na sny, the recycled granules are screened using a vibrating screen to remove any oversized or undersized granules, ensuring uniform particle size. The screened granules are then dried again (if necessary) to remove any moisture absorbed during cooling, then packaged into bags or bulk containers for storage and transportation.
Packaging is an important step to prevent contamination and moisture absorption of the recycled granules. The packaging materials should be moisture-proof and clean, and the granules should be stored in a dry, ventilated, and clean warehouse to maintain their quality.
3. Extruder Selection for Waste Plastic Recycling Granulation
Soos vroeër genoem, the extruder is the core equipment in the waste plastic recycling granulation process. The selection of the right extruder depends on the type of waste plastic, the desired granule quality, the production volume, and the budget. There are two main types of extruders used in waste plastic recycling granulation: twin-screw extruders and single-screw extruders. Each type has its own unique advantages and is suitable for different applications.
3.1 Twin-screw Extruders for Recycling Granulation
Twin-screw extruders are widely used in the recycling granulation of engineering plastics and plastics with high contamination levels, soos ABS, PS, en PET. They consist of two parallel screws that rotate in the same direction (co-rotating) or opposite directions (teenroterende) within a barrel. Co-rotating twin-screw extruders are more commonly used in plastic recycling due to their superior mixing and conveying capabilities.
3.1.1 Key Advantages of Twin-screw Extruders
- Easy Material Feeding: Twin-screw extruders have a strong conveying capacity, which allows for easy feeding of crushed plastic pieces, even if they are irregular in shape or have a certain amount of contaminants. This reduces the need for pre-processing of the material and improves production efficiency.
- Short Material Residence Time: The residence time of the material in the twin-screw extruder is short (tipies 1-5 minute) compared to single-screw extruders. This helps to avoid thermal degradation of the plastic, especially for heat-sensitive plastics such as PET and ABS, which can degrade easily when exposed to high temperatures for a long time. Short residence time also reduces energy consumption and improves production efficiency.
- Excellent Venting Effect: Twin-screw extruders are equipped with venting ports that allow for the removal of moisture, volatile gases, and air from the molten plastic. The meshing part of the screws provides effective mixing, and the self-cleaning function of the venting section ensures that the material can achieve complete surface renewal, allowing for efficient removal of volatile substances. This helps to improve the quality of the recycled granules by reducing the number of bubbles and defects.
- Superior Mixing and Plasticizing Effect: The co-rotating twin-screw extruders have strong shear and mixing capabilities, which can effectively homogenize the molten plastic, disperse contaminants, and mix additives (soos stabiliseerders, antioksidante, en kleurstowwe) uniformly. This ensures that the recycled granules have consistent properties and good processability.
- Low Specific Power Consumption: Despite their high performance, twin-screw extruders have low specific power consumption (power consumption per unit output), making them more energy-efficient compared to single-screw extruders for certain applications. This helps to reduce operating costs for recycling enterprises.
- High Volume Power: Twin-screw extruders have a high volume power (power per unit volume of the barrel), which means they can process a large amount of material in a small space. This makes them suitable for large-scale production operations with limited space.
3.1.2 Suitable Applications for Twin-screw Extruders
Twin-screw extruders are particularly suitable for the recycling granulation of the following plastics:
- ABS: A high-performance plastic that is widely used in electronic products, motoronderdele, en speelgoed. ABS is sensitive to heat and requires short residence time and good mixing, making twin-screw extruders the ideal choice.
- PS: Both rigid and foam PS can be recycled using twin-screw extruders. Die uitstekende mengvermoëns van dubbelskroef-ekstruders help om enige oorblywende skuimselle en kontaminante te versprei, verseker goeie korrelkwaliteit.
- PET: PET is hoogs sensitief vir vog en hitte, en vereis presiese temperatuurbeheer en kort verblyftyd. Dubbelskroef-ekstruders met goeie ventilasie- en temperatuurbeheervermoëns is geskik vir PET-herwinninggranulering.
- Ingenieursplastiek: Ander ingenieursplastiek soos PC (Polikarbonaat), PA (Poliamied), en POM (Polioksimetileen) kan ook herwin word met behulp van dubbelskroef-ekstruders, danksy hul uitstekende meng- en plastiseringsvermoëns.
3.2 Enkelskroef-ekstruders vir herwinning van granulasie
Enkelskroef-ekstruders is eenvoudiger in struktuur, laer in koste, en makliker om te onderhou in vergelyking met dubbelskroef-ekstruders. Hulle bestaan uit 'n enkele skroef wat binne 'n loop draai, conveying and melting the material through friction and shear between the screw and the barrel. Single-screw extruders are widely used in the recycling granulation of general-purpose plastics such as PP, PE, and LDPE.
3.2.1 Key Advantages of Single-screw Extruders
- Short Screw Length and Residence Time: Single-screw extruders typically have a shorter screw length compared to twin-screw extruders, resulting in shorter material residence time. This helps to avoid thermal degradation of the plastic, especially for soft plastics such as PE and LDPE, which have lower melting points and are prone to degradation.
- Koste-effektief: Waste plastic recycling often involves materials with high levels of contaminants, which can cause significant wear and tear on the extruder screw and barrel. Single-screw extruders are simpler in structure and use less expensive materials, making them more cost-effective to replace and maintain compared to twin-screw extruders. This is particularly important for small and medium-sized recycling enterprises with limited budgets.
- Suitable for Soft Plastics: The material conveying efficiency of single-screw extruders depends on the friction performance of the solid material and the viscosity of the melt. Soft plastics such as PP, PE, and LDPE have good friction performance and low melt viscosity, making them ideal for processing with single-screw extruders. These plastics can be conveyed and melted efficiently, verseker goeie korrelkwaliteit.
- Simple Operation and Maintenance: Single-screw extruders have a simple structure, met minder bewegende dele, making them easy to operate and maintain. This reduces the need for skilled operators and lowers maintenance costs, which is beneficial for small-scale recycling operations.
3.2.2 Suitable Applications for Single-screw Extruders
Single-screw extruders are particularly suitable for the recycling granulation of the following plastics:
- PP (Polipropileen): PP is a soft plastic with good friction performance and processability, making it ideal for processing with single-screw extruders. Recycled PP granules produced using single-screw extruders have good mechanical properties and can be used in a wide range of applications.
- PE (Poliëtileen): Both LDPE and HDPE are suitable for processing with single-screw extruders. LDPE, in die besonder, is a soft plastic with low melt viscosity, which can be conveyed and melted efficiently by single-screw extruders. Recycled PE granules are widely used in the production of plastic films and pipes.
- LDPE (Lae-digtheid poliëtileen): LDPE is commonly used in plastic films and bags, which are easy to crush and process. Single-screw extruders are ideal for LDPE recycling granulation, as they can handle the soft material efficiently and cost-effectively.
3.3 Key Factors for Extruder Selection
When selecting an extruder for waste plastic recycling granulation, the following key factors should be considered:
- Type of Waste Plastic: As discussed earlier, twin-screw extruders are suitable for engineering plastics (ABS, PS, PET) and plastics with high contamination levels, while single-screw extruders are suitable for general-purpose plastics (PP, PE, LDPE).
- Produksie Volume: For large-scale production (more than 500kg/h), twin-screw extruders are more suitable due to their high throughput and efficiency. For small-scale production (less than 200kg/h), single-screw extruders are more cost-effective and practical.
- Granule Quality Requirements: If high-quality recycled granules with uniform properties and low contamination are required (such as for automotive parts and electronic products), twin-screw extruders are the better choice due to their superior mixing and plasticizing capabilities. For general-purpose applications (such as plastic films and low-grade injection-molded products), single-screw extruders can meet the requirements at a lower cost.
- Begroting: Twin-screw extruders are more expensive than single-screw extruders, both in terms of initial investment and maintenance costs. Daarom, enterprises with limited budgets may prefer single-screw extruders for general-purpose plastic recycling.
- Energieverbruik: For large-scale production, energy consumption is an important consideration. Twin-screw extruders have lower specific power consumption, making them more energy-efficient for high-volume operations. Single-screw extruders may be more energy-efficient for small-scale operations due to their simpler structure.
4. Zhuoyue Extruder Series for Waste Plastic Recycling Granulation
Zhuoyue offers a comprehensive range of extruders specifically designed for waste plastic recycling granulation, including twin-screw extruders and single-screw extruders. The extruder series are tailored to meet the specific needs of different types of waste plastics, production volumes, and granule quality requirements, combining high performance, doeltreffendheid, energiebesparend, en kostedoeltreffendheid. The main extruder series include ZTE series and HTE series, each with unique features and advantages to suit different application scenarios.
4.1 Core Technical Features of Zhuoyue Extruders
All Zhuoyue extruders for waste plastic recycling granulation share a set of core technical features that make them ideal for the harsh conditions of plastic recycling, such as high contamination levels, irregular material shapes, and varying material properties:
- Robust Construction: Zhuoyue extruders are built with high-quality materials (such as alloy steel for screws and barrels) to withstand the wear and tear caused by contaminants in waste plastics. The screws and barrels are treated with special surface treatments (such as nitriding and hard chrome plating) to improve their wear resistance and service life.
- Precise Temperature Control: The extruders are equipped with advanced temperature control systems, including heating zones and cooling zones, to ensure precise control of the barrel and die temperature. This helps to avoid thermal degradation of the plastic and ensure complete melting and mixing.
- Efficient Conveying and Mixing: The screw designs are optimized for waste plastic recycling, with enhanced conveying capacity and mixing capabilities. Twin-screw extruders feature co-rotating screws with optimized flight profiles to ensure superior mixing and homogenization, while single-screw extruders have specially designed screws to improve conveying efficiency for soft plastics.
- Excellent Venting Performance: Twin-screw extruders are equipped with multiple venting ports to remove moisture, volatile gases, and air from the molten plastic, ensuring high-quality granules with minimal defects. The self-cleaning function of the venting section ensures efficient venting even with contaminated materials.
- Energiebesparende ontwerp: Zhuoyue extruders adopt energy-saving technologies such as variable frequency drives (VFD) and optimized motor configurations to reduce energy consumption. This helps to lower operating costs for recycling enterprises.
- Maklike werking en instandhouding: The extruders are designed with user-friendly interfaces and simple structures, making them easy to operate and maintain. The screws and barrels can be easily disassembled for cleaning and replacement, stilstand te verminder.
- Customizable Configurations: Zhuoyue extruders can be customized with different screw lengths, diameters, and configurations to meet the specific needs of different types of waste plastics and production volumes. Byvoorbeeld, extruders for PET recycling can be equipped with special drying systems and venting ports to ensure complete moisture removal.
4.2 ZTE-reeks-ekstruders
The ZTE series is Zhuoyue’s cost-effective extruder series, designed for small and medium-sized recycling enterprises and general-purpose waste plastic recycling granulation. This series offers excellent cost-performance ratio, with parameters designed to suit most common waste plastics, insluitend PP, PE, LDPE, and general-purpose ABS and PS. The ZTE series includes both single-screw and twin-screw extruders, providing flexible options for different applications.
4.2.1 Key Features of ZTE Series Extruders
- Excellent Cost-Performance Ratio: The ZTE series is designed to provide reliable performance at a competitive price, making it the ideal choice for enterprises with limited budgets or small-scale production needs. The initial investment and maintenance costs are significantly lower than high-end extruders, while still meeting the basic requirements of waste plastic recycling granulation.
- Versatile Parameter Design: The parameters of the ZTE series are designed to suit most common waste plastics, insluitend PP, PE, LDPE, ABS, en PS. This versatility allows enterprises to process multiple types of waste plastics with a single extruder, improving production flexibility and reducing equipment investment.
- Reliable Operation: The ZTE series adopts a reliable standard transmission system and simple structure, ensuring stable operation even in harsh recycling environments. The screws and barrels are designed to handle contaminants in waste plastics, reducing the risk of equipment failure.
- Low Maintenance Costs: The simple structure of the ZTE series makes it easy to maintain, with fewer moving parts and lower maintenance requirements. The screws and barrels can be easily replaced when worn, vermindering van stilstand en onderhoudskoste.
- Suitable for Small to Medium-Scale Production: The ZTE series is available in a range of sizes, with throughputs ranging from 50kg/h to 500kg/h, making it suitable for small to medium-scale recycling operations.
4.2.2 ZTE Series Model Parameters
The ZTE series includes both single-screw and twin-screw extruders, with parameters tailored to different types of waste plastics. The following table details the parameters of the ZTE series twin-screw extruders, suitable for ABS, PS, and PET recycling granulation:
| Model | Spesifieke wringkrag（N.m/Cm³） | Hoofmotorkrag (Kw) | Output speed（rpm） | Slot depth ratio D0/Di | Suitable Plastics |
|---|---|---|---|---|---|
| 25 | 6 | 7.5 | 600 | 1.55 | PS, Small-scale ABS |
| 35 | 6 | 18.5 | 600 | 1.55 | PS, ABS, LDPE |
| 50 | 6 | 55 | 600 | 1.55/1.68 | ABS, PS, PET (Small-scale) |
| 65 | 6 | 110 | 600 | 1.55/1.68 | ABS, PS, PET |
| 75 | 6 | 160 | 600 | 1.55/1.68 | ABS, PS, PET, PP |
| 95 | 6 | 300 | 600 | 1.55/1.68 | ABS, PS, PET, PP, PE |
The ZTE series single-screw extruders are mainly used for PP, PE, and LDPE recycling granulation, with parameters optimized for soft plastics. The screws are designed with enhanced conveying capacity to handle the irregular shapes of crushed plastic films and bottles, ensuring efficient production.
4.2.3 Application Scenarios for ZTE Series
The ZTE series is ideal for the following application scenarios:
- Small and medium-sized recycling enterprises with limited budgets.
- General-purpose waste plastic recycling, insluitend PP, PE, LDPE, ABS, en PS.
- Production of general-purpose recycled granules for plastic films, low-grade injection-molded products, and construction components.
- Enterprises new to plastic recycling, thanks to the easy operation and low maintenance requirements of the ZTE series.
4.3 HTE Series Extruders
The HTE series is Zhuoyue’s mid-range extruder series, designed to bridge the gap between cost-effective extruders (such as ZTE series) and high-end extruders. This series combines high performance with high cost-effectiveness, lewer hoër uitset terwyl energieverbruik verminder word. The HTE series includes both twin-screw and single-screw extruders, suitable for medium to large-scale waste plastic recycling granulation.
4.3.1 Key Features of HTE Series Extruders
- Balanced Performance and Cost-Effectiveness: The HTE series offers higher performance than the ZTE series, including better mixing capabilities, hoër deurset, and more precise temperature control, while maintaining a competitive price. This makes it suitable for enterprises that require higher granule quality but do not want to invest in high-end extruders.
- Energy-Saving and High Output: The HTE series is optimized for energy efficiency, with advanced motor configurations and variable frequency drives (VFD) to reduce energy consumption. Terselfdertyd, the extruders have higher throughput, allowing for medium to large-scale production (500kg/h to 1000kg/h) with lower energy costs.
- Reasonable Torque and Power Configuration: The HTE series has a reasonable torque and power configuration, ensuring stable and efficient production even when processing plastics with high contamination levels or varying properties. The twin-screw extruders have higher torque density, making them suitable for processing engineering plastics such as ABS and PET, while the single-screw extruders are optimized for soft plastics such as PP and PE.
- Dual-Speed Options for Partial Models: Some models of the HTE series are equipped with dual-speed options, allowing for flexible adjustment of the screw speed to suit different types of plastics and production requirements. This expands the application range of the extruders, making them suitable for multiple plastic types.
- Enhanced Wear Resistance: The screws and barrels of the HTE series are made of high-quality alloy steel and treated with advanced surface treatments to improve their wear resistance, ensuring a long service life even in harsh recycling environments.
- Advanced Control System: The HTE series is equipped with advanced PLC control systems, allowing for automatic control of temperature, skroef spoed, ekstrusie druk, and other key parameters. This improves the stability and consistency of the granulation process, ensuring uniform granule quality.
4.3.2 HTE Series Model Parameters
The HTE series twin-screw extruders are suitable for ABS, PS, PET, PP, PE, and LDPE recycling granulation, with parameters optimized for high performance and efficiency. The following table details the specific parameters:
| Model | Spesifieke wringkrag（N.m/Cm³） | Hoofmotorkrag (Kw) | Output speed（rpm） | Slot depth ratio D0/Di | Suitable Plastics | Deurset (kg/h) |
|---|---|---|---|---|---|---|
| 25 | 9 | 11 | 600 | 1.55 | PS, ABS, LDPE | 50-100 |
| 35 | 9 | 30 | 600 | 1.55 | PS, ABS, PE, LDPE | 100-200 |
| 35 | 9 | 45 | 1000 | 1.55 | PS, ABS, PE, LDPE | 200-300 |
| 50 | 9 | 75 | 600 | 1.55/1.68 | ABS, PS, PET, PP | 300-500 |
| 50 | 9 | 110 | 900 | 1.55/1.68 | ABS, PS, PET, PP | 500-700 |
| 65 | 9 | 160 | 600 | 1.55/1.68 | ABS, PS, PET, PP, PE | 700-900 |
| 65 | 9 | 220 | 900 | 1.55/1.68 | ABS, PS, PET, PP, PE | 900-1200 |
| 75 | 9 | 250 | 600 | 1.55/1.68 | ABS, PS, PET, PP, PE, LDPE | 1200-1500 |
| 75 | 9 | 315 | 900 | 1.55/1.68 | ABS, PS, PET, PP, PE, LDPE | 1500-1800 |
| 95 | 9 | 400 | 600 | 1.55/1.68 | All common waste plastics | 1800-2200 |
The HTE series single-screw extruders are optimized for PP, PE, and LDPE recycling granulation, with higher throughput and better energy efficiency compared to the ZTE series. They are suitable for medium to large-scale production of recycled granules for plastic films, pype, en spuitgevormde produkte.
4.3.3 Application Scenarios for HTE Series
The HTE series is ideal for the following application scenarios:
- Medium to large-scale recycling enterprises with higher granule quality requirements.
- Recycling of multiple types of waste plastics, insluitend PP, PE, LDPE, ABS, PS, en PET.
- Production of high-quality recycled granules for automotive parts, electronic product accessories, and high-grade injection-molded products.
- Enterprises that focus on energy efficiency and cost reduction, thanks to the energy-saving design of the HTE series.
4.4 Customized Solutions from Zhuoyue
In addition to the standard ZTE and HTE series, Zhuoyue also provides customized extruder solutions for special waste plastic recycling needs. Byvoorbeeld:
- Customized extruders for high-contamination waste plastics, equipped with enhanced filtering systems to remove contaminants.
- Extruders for heat-sensitive plastics such as PET and PC, equipped with special drying systems and low-shear screws to avoid thermal degradation.
- Complete recycling granulation production lines, including crushers, droërs, ekstrueerders, pelletiseerders, and screening equipment, to provide a one-stop solution for enterprises.
Zhuoyue’s professional R&D team works closely with customers to understand their specific needs and provide tailored solutions that meet their production requirements and budget.
5. Best Practices for Waste Plastic Recycling Granulation with Zhuoyue Extruders
To ensure the best performance and granule quality when using Zhuoyue extruders for waste plastic recycling granulation, the following best practices are recommended:
5.1 Proper Sorting and Cleaning
Effective sorting and cleaning are essential to reduce the wear and tear on the extruder and ensure high-quality granules. Separate different types of plastics to avoid mixing, and remove non-plastic contaminants (soos metaal, papier, and glass) as much as possible. Thoroughly clean the waste plastics to remove oil, smeer, en voedselreste, which can affect the mixing and plasticizing effect.
5.2 Optimal Drying
Ensure that the crushed plastic pieces are properly dried to reduce the moisture content to below 0.5%. For moisture-sensitive plastics such as PET, use high-temperature drying (120-160°C) for a sufficient period to ensure complete moisture removal. This helps to avoid bubbles and defects in the recycled granules.
5.3 Precise Process Parameter Control
Adjust the extruder parameters (soos temperatuur, skroef spoed, en ekstrusiedruk) according to the type of waste plastic. Follow the recommended parameter settings provided by Zhuoyue, and make adjustments based on the actual material properties and granule quality. Avoid excessively high temperatures or shear rates, which can cause plastic degradation.
5.4 Regular Maintenance
Regularly inspect and maintain the extruder to ensure its normal operation. Clean the screws and barrels regularly to remove any accumulated material or contaminants. Check the wear of the screws and barrels, and replace them when necessary. Lubricate the moving parts regularly to reduce friction and extend the service life of the extruder.
5.5 Use of Additives (If Necessary)
For waste plastics with severe degradation or poor performance, consider adding additives such as stabilizers, antioksidante, and plasticizers to improve the quality of the recycled granules. Consult Zhuoyue’s technical team to select the appropriate additives and dosage.
6. Gevolgtrekking
Waste plastic recycling granulation is a critical technology for realizing resource circulation and environmental protection, offering significant economic, omgewing, and social benefits. The quality and efficiency of the granulation process depend largely on the extruder used, and selecting the right extruder is essential for the success of a plastic recycling enterprise.
Zhuoyue’s ZTE series and HTE series extruders are specifically designed for waste plastic recycling granulation, combining high performance, doeltreffendheid, energiebesparend, en kostedoeltreffendheid. The ZTE series provides a cost-effective solution for small and medium-sized enterprises and general-purpose plastic recycling, while the HTE series offers balanced performance and cost-effectiveness for medium to large-scale production with higher quality requirements. With robust construction, presiese temperatuurbeheer, superior mixing capabilities, and customizable configurations, Zhuoyue extruders can handle all types of waste plastics, from PP and PE to ABS and PET, delivering high-quality recycled granules for a wide range of applications.
As a leader in extrusion technology, Zhuoyue is committed to providing advanced, betroubaar, and cost-effective solutions for the plastic recycling industry. With professional R&D, high-quality products, and comprehensive after-sales service, Zhuoyue helps enterprises unlock the full potential of waste plastic recycling, contributing to a more sustainable and environmentally friendly future.