Dengan pesatnya kemajuan industrialisasi global, permintaan material berkinerja tinggi di bidang otomotif, listrik dan elektronik, konstruksi, bidang medis dan lainnya meningkat dari hari ke hari. Plastik rekayasa, sebagai bahan utama berkinerja tinggi, secara bertahap menggantikan material logam tradisional dan plastik umum dalam banyak skenario aplikasi inti karena sifat mekaniknya yang sangat baik, tahan panas, ketahanan terhadap korosi, stabilitas dimensi dan kemampuan proses. Teknologi ekstrusi sekrup kembar adalah teknologi pemrosesan inti dari senyawa plastik rekayasa, dan kinerja peralatan ekstrusi secara langsung menentukan kualitasnya, efisiensi produksi dan efek penerapan produk plastik rekayasa.
We are committed to providing professional twin-screw extrusion solutions for engineering plastics processing, relying on our independently developed and manufactured HTS series extruders with high-torque gearboxes, which are specially designed for the processing characteristics and application needs of engineering plastics. This article will comprehensively elaborate on the performance characteristics, klasifikasi, processing difficulties of engineering plastics, the core role of twin-screw extrusion technology in engineering plastics processing, the advantages of our HTS series extruders and their targeted adaptation to engineering plastics, serta bidang aplikasi spesifik, processing techniques and common problems and solutions. By supplementing detailed technical parameters, processing details and industry application cases, artikel akan diperkaya menjadi 3000-4000 kata-kata, memberikan referensi yang komprehensif dan profesional untuk perusahaan pengolahan plastik rekayasa, teknisi dan praktisi terkait.
1. Ikhtisar Industri Plastik Rekayasa dan Karakteristik Kinerja Inti
1.1 Situasi Saat Ini dan Tren Perkembangan Industri Plastik Rekayasa
Plastik rekayasa mengacu pada kelas bahan plastik yang dapat digunakan sebagai bahan struktural dan menanggung beban mekanis dalam rentang suhu yang luas. Dibandingkan dengan plastik umum (seperti polietilen PE, polipropilen PP, polivinil klorida PVC), plastik rekayasa memiliki kinerja komprehensif yang lebih baik, dan dapat memenuhi persyaratan penggunaan yang keras dalam produksi industri dan manufaktur produk kelas atas. Dalam beberapa tahun terakhir, didorong oleh peningkatan industri hilir seperti otomotif ringan, kecerdasan listrik dan elektronik, dan perangkat medis kelas atas, pasar plastik rekayasa global telah menunjukkan tren pertumbuhan yang stabil dan cepat.
Menurut data industri yang relevan, ukuran pasar plastik rekayasa global telah melampauinya 100 miliar dolar AS, dan diperkirakan akan mempertahankan tingkat pertumbuhan tahunan gabungan sebesar 7%-10% dalam lima tahun ke depan. Diantaranya, Asia-Pasifik adalah pasar produksi dan konsumsi plastik rekayasa terbesar di dunia, terhitung lebih dari 55% dari pangsa pasar global, terutama disebabkan oleh pesatnya perkembangan otomotif, industri listrik dan elektronik di Cina, India dan negara-negara lain, serta peningkatan daya dukung industri dan tingkat inovasi teknologi secara berkelanjutan. Cina, sebagai konsumen dan produsen plastik rekayasa terbesar di dunia, mempunyai permintaan pasar yang besar, dan output serta konsumsi tahunan tumbuh pada tingkat dua digit, khususnya di bidang kendaraan energi baru, 5G komunikasi, dan peralatan medis, the demand for high-performance engineering plastics is showing an explosive growth trend.
The development trend of the engineering plastics industry is mainly reflected in five aspects: Pertama, kinerja dan fungsionalitas tinggi. With the continuous improvement of use requirements in downstream fields, engineering plastics are developing towards higher heat resistance, higher strength, better wear resistance and special functions (seperti penghambat api, antistatis, antibakteri, radiation resistance), to adapt to the harsh working environment of high temperature, high pressure, corrosion and radiation; Kedua, lightweight and integration. In the automotive, aerospace and other fields, in order to achieve energy saving and emission reduction goals, engineering plastics are increasingly used to replace metal materials, dan integrasi desain produk menjadi semakin tinggi, yang dapat mengurangi jumlah bagian, menyederhanakan proses produksi dan mengurangi biaya; ketiga, perlindungan lingkungan dan daur ulang. Dengan penguatan kebijakan perlindungan lingkungan global dan peningkatan kesadaran perlindungan lingkungan, pengembangan dan penerapan plastik rekayasa yang dapat didaur ulang, plastik rekayasa yang dapat terurai secara hayati dan teknologi pemrosesan yang ramah lingkungan telah menjadi fokus industri, mengurangi pencemaran lingkungan akibat sampah plastik; keempat, kecerdasan dan ketepatan peralatan pemrosesan. Plastik rekayasa memiliki kesulitan pemrosesan yang tinggi dan persyaratan kualitas yang ketat, yang mengedepankan persyaratan lebih tinggi pada peralatan pemrosesan. Cerdas, ekstruder sekrup kembar yang tepat dan efisien serta jalur produksi otomatis telah menjadi arus utama industri, mewujudkan pemantauan real-time, penyesuaian parameter otomatis dan pemeliharaan prediktif dari proses pemrosesan; kelima, diversifikasi bidang aplikasi. Plastik rekayasa secara bertahap berkembang dari otomotif tradisional, bidang listrik dan elektronik menjadi energi baru, medis, luar angkasa, konstruksi dan bidang baru lainnya, membuka ruang pasar baru.
Dengan latar belakang ini, teknologi ekstrusi sekrup kembar, sebagai teknologi pengolahan inti rekayasa senyawa plastik, telah menjadi kunci untuk meningkatkan daya saing perusahaan plastik rekayasa. Plastik rekayasa sensitif terhadap panas berlebih dan degradasi hidrolitik, dan memiliki persyaratan tinggi pada suhu pemrosesan, kekuatan geser, waktu tinggal dan presisi kontrol suhu. Ekstruder seri HTS kami dirancang khusus untuk karakteristik pemrosesan plastik rekayasa, dengan torsi tinggi, kecepatan tinggi, kontrol suhu yang tepat dan dispersibilitas yang sangat baik, yang secara efektif dapat mengatasi kesulitan pemrosesan plastik rekayasa dan membantu perusahaan mencapai kualitas tinggi, produksi yang efisien dan stabil.
1.2 Karakteristik Kinerja Inti Plastik Rekayasa
Dibandingkan dengan bahan plastik dan logam pada umumnya, plastik rekayasa memiliki kinerja komprehensif yang unik, yang menentukan penerapannya secara luas di berbagai bidang industri. Karakteristik kinerja inti dari plastik rekayasa terutama tercermin dalam lima aspek berikut, yang juga mengedepankan persyaratan khusus untuk teknologi dan peralatan pemrosesannya:
1.2.1 Ketahanan Panas yang Sangat Baik dan Ketahanan Dingin
Plastik rekayasa memiliki rentang adaptasi suhu yang luas, yang dapat mempertahankan sifat mekanik yang baik (kekuatan, kekerasan, kekerasan) pada lingkungan bersuhu tinggi dan rendah. Dibandingkan dengan plastik umum, yang biasanya kehilangan sifat mekaniknya pada 80-120℃, sebagian besar plastik rekayasa dapat bekerja secara stabil pada suhu 100-250℃, dan beberapa plastik rekayasa khusus (seperti MENGINTIP, PI) bahkan dapat bekerja pada suhu di atas 300℃. Pada saat yang sama, plastik rekayasa juga memiliki ketahanan dingin yang baik, yang dapat mempertahankan ketangguhan yang baik pada suhu rendah (di bawah -40℃), dan tidak mudah patah rapuh. Kinerja ini membuat plastik rekayasa cocok untuk digunakan di lingkungan bersuhu keras, seperti suku cadang mesin otomotif (suhu tinggi) dan peralatan listrik luar ruangan (suhu rendah).
The excellent heat resistance of engineering plastics is mainly due to their special molecular structure (such as aromatic rings, heterocyclic rings) and strong intermolecular forces, which makes them not easy to melt and decompose at high temperatures. Namun, this also brings certain difficulties to processing: higher processing temperature is required to make them melt and plasticize, and precise temperature control is needed to avoid thermal decomposition.
1.2.2 Good Corrosion Resistance and Durability
Engineering plastics have excellent chemical stability and corrosion resistance, and are not easy to be corroded by acids, alkalis, salts, organic solvents and other chemicals. Compared with metal materials, which are easy to rust and corrode, engineering plastics have longer service life in harsh chemical environments. Misalnya, poliamida (PA) plastik rekayasa tahan terhadap sebagian besar pelarut organik serta asam dan basa lemah; polikarbonat (komputer) plastik rekayasa tahan terhadap korosi oleh asam dan garam non-oksidasi; polifenilen sulfida (PPS) plastik rekayasa tahan terhadap korosi oleh hampir semua bahan kimia kecuali asam pengoksidasi kuat.
Selain itu, plastik rekayasa memiliki ketahanan cuaca dan ketahanan penuaan yang baik, dan tidak mudah terdegradasi dan menua di bawah pengaruh sinar matahari, hujan, oksigen dan faktor lingkungan lainnya, yang memastikan penggunaan stabil jangka panjangnya di luar ruangan dan lingkungan yang keras. Kinerja ini membuat plastik rekayasa banyak digunakan dalam peralatan kimia, peralatan listrik luar ruangan, suku cadang eksterior otomotif dan bidang lainnya.
1.2.3 Pemrosesan Mudah dan Efisiensi Produksi Tinggi
Compared with metal materials, plastik rekayasa memiliki keunggulan dalam pengolahannya yang mudah, simple production process and high production efficiency. Metal materials usually need complex processing procedures such as forging, casting, permesinan, which have high energy consumption, low efficiency and high cost; while engineering plastics can be processed by extrusion, cetakan injeksi, blow molding and other methods, which can realize mass production, simplify the production process, reduce energy consumption and production cost. Misalnya, the processing cycle of an engineering plastic automotive part by injection molding is only a few seconds to tens of seconds, while the processing cycle of the same metal part may take several hours to several days.
Namun, engineering plastics also have certain processing difficulties: they are sensitive to overheating and hydrolytic degradation, dan mudah terurai jika suhu pemrosesan terlalu tinggi atau waktu tinggal terlalu lama; pada saat yang sama, beberapa plastik rekayasa (seperti PA) mempunyai daya serap air yang tinggi, Yang mempengaruhi efek pemrosesan dan kualitas produk. Karena itu, perlu menggunakan peralatan pemrosesan profesional dan teknik pemrosesan ilmiah untuk memastikan kualitas pemrosesan.
1.2.4 Stabilitas Dimensi dan Isolasi Listrik yang Sangat Baik
Plastik rekayasa memiliki stabilitas dimensi yang baik, dan tingkat penyusutannya kecil (biasanya 0.3%-1.5%) selama pemrosesan dan penggunaan, yang dapat memastikan keakuratan dimensi produk dan menghindari deformasi. Performa ini sangat penting terutama untuk suku cadang berpresisi tinggi, seperti konektor listrik, komponen presisi otomotif, alat kesehatan, dll.. Stabilitas dimensi yang baik dari plastik rekayasa terutama disebabkan oleh kristalinitasnya yang tinggi, low water absorption (except for some varieties such as PA) and strong intermolecular forces.
Selain itu, most engineering plastics have excellent electrical insulation performance, which can maintain good insulation performance in a wide temperature range and frequency range, and are not easy to conduct electricity and arc. This makes engineering plastics widely used in electrical and electronic fields, such as wiring boards, cable ties, konektor, relays, motors and other electrical components.
1.2.5 Light Weight and High Specific Strength, Outstanding Wear Resistance
Engineering plastics have the characteristics of light weight (density is 1/3-1/5 of metal materials) and high specific strength (strength per unit weight is equivalent to or even higher than that of metal materials). Misalnya, the specific strength of glass fiber reinforced polyamide (PA66+GF30) is higher than that of ordinary carbon steel, yang secara efektif dapat mengurangi berat produk sekaligus memastikan kinerja mekanis. Performa ini sangat penting dalam otomotif, dirgantara dan bidang lain yang mengutamakan ringan dan hemat energi, yang dapat mengurangi konsumsi bahan bakar dan emisi karbon.
Pada saat yang sama, plastik rekayasa juga memiliki ketahanan aus dan ketahanan gesekan yang luar biasa, dan koefisien gesekannya kecil, yang dapat digunakan dalam produksi suku cadang tahan aus (seperti roda gigi, bantalan, blok geser) tanpa pelumasan tambahan atau dengan pelumasan lebih sedikit, mengurangi biaya pemeliharaan produk. Misalnya, polioksimetilen (POM) plastik rekayasa memiliki ketahanan aus yang sangat baik dan dikenal sebagai “baja plastik”, yang banyak digunakan dalam produksi perlengkapan otomotif, komponen listrik dan bagian tahan aus lainnya.
1.3 Klasifikasi Umum Plastik Rekayasa
Plastik rekayasa dapat dibagi menjadi beberapa jenis berdasarkan struktur kimianya, tingkat kinerja dan bidang aplikasi. Metode klasifikasi umum adalah sebagai berikut, yang membantu untuk lebih memahami karakteristik pemrosesan dan skenario penerapan berbagai plastik rekayasa, dan memilih peralatan ekstrusi dan teknik pemrosesan yang sesuai:
1.3.1 Klasifikasi berdasarkan Tingkat Kinerja
Menurut tingkat kinerja, plastik rekayasa dapat dibagi menjadi plastik rekayasa umum dan plastik rekayasa khusus.
- Plastik Rekayasa Umum: Mereka adalah plastik rekayasa yang paling banyak digunakan, dengan teknologi produksi yang relatif matang, harga moderat dan kinerja komprehensif yang baik. Varietas utama termasuk poliamida (PA), polikarbonat (komputer), polioksimetilen (POM), polietilen tereftalat (PELIHARAAN), polibutilena tereftalat (PBT), dll.. Plastik rekayasa umum terutama digunakan dalam otomotif, listrik dan elektronik, peralatan rumah tangga dan bidang lainnya, seperti suku cadang otomotif, konektor listrik, cangkang peralatan rumah tangga, dll..
- Plastik Rekayasa Khusus: Mereka memiliki kinerja yang lebih baik (seperti ketahanan panas yang lebih tinggi, ketahanan terhadap korosi, sifat mekanik) daripada plastik rekayasa umum, tetapi teknologi produksinya rumit dan harganya tinggi. Varietas utama termasuk polifenilen sulfida (PPS), polieter eter keton (MENGINTIP), polimida (PI), polisulfon (PSU), polietersulfon (PES), dll.. Plastik rekayasa khusus terutama digunakan di bidang kelas atas seperti dirgantara, alat kesehatan, energi baru, dan peralatan kimia, seperti komponen luar angkasa, implan medis, komponen listrik tahan suhu tinggi, dll..
1.3.2 Klasifikasi berdasarkan Struktur Kimia
Menurut struktur kimia rantai molekul, plastik rekayasa dapat dibagi menjadi poliamida (PA), polikarbonat (komputer), polioksimetilen (POM), poliester (PELIHARAAN, PBT), polifenilen sulfida (PPS), polieter eter keton (MENGINTIP), dll.. Setiap jenis plastik rekayasa memiliki karakteristik kinerja dan persyaratan pemrosesan yang unik:
- Poliamida (PA): Juga dikenal sebagai nilon, ia memiliki kekuatan mekanik yang sangat baik, ketahanan aus, ketangguhan dan ketahanan kimia, namun memiliki daya serap air yang tinggi, yang mempengaruhi stabilitas dimensi. Varietas umum termasuk PA6, PA66, PA11, PA12, dll.. Ini banyak digunakan di suku cadang otomotif (roda gigi, bantalan, manifold masuk), konektor listrik, serat tekstil, dll..
- Polikarbonat (komputer): Ini memiliki transparansi yang sangat baik, kekuatan dampak, tahan panas dan isolasi listrik, tetapi memiliki ketahanan aus yang buruk dan mudah tergores. Ini banyak digunakan di bidang listrik dan elektronik (papan kabel, penutup lampu), bidang otomotif (lensa lampu depan, panel instrumen), bidang medis (wadah medis), dll..
- Polioksimetilen (POM): Ini memiliki ketahanan aus yang sangat baik, ketahanan gesekan, stabilitas dimensi dan kekuatan mekanik, dan tidak mudah menyerap air. Hal ini dikenal sebagai “baja plastik” dan banyak digunakan pada suku cadang otomotif (roda gigi, blok geser), electrical components (switches, bantalan), mechanical parts, dll..
- Polyester (PELIHARAAN, PBT): PET has excellent transparency, heat resistance and mechanical strength, and is mainly used in fibers, film, bottles and other fields; PBT has excellent chemical resistance, electrical insulation and processing fluidity, and is widely used in electrical and electronic fields (konektor, relays), suku cadang otomotif, dll..
- Polyphenylene Sulfide (PPS): Ini memiliki ketahanan panas yang sangat baik (long-term use temperature up to 200-220℃), ketahanan terhadap korosi, flame retardancy and electrical insulation, but has poor toughness. It is widely used in high-temperature resistant electrical components, automotive engine parts, chemical equipment, dll..
- Polyether Ether Ketone (MENGINTIP): It has excellent comprehensive performance, long-term use temperature up to 250-300℃, good corrosion resistance, mechanical strength and biocompatibility. It is mainly used in high-end fields such as aerospace, implan medis, and high-temperature resistant electrical components.
1.3.3 Klasifikasi berdasarkan Bidang Aplikasi
According to the application field, engineering plastics can be divided into automotive-grade engineering plastics, electrical-grade engineering plastics, medical-grade engineering plastics, aerospace-grade engineering plastics, dll.. Different application fields have different requirements on the performance of engineering plastics. Misalnya, automotive-grade engineering plastics require good heat resistance, impact strength and weather resistance; electrical-grade engineering plastics require good electrical insulation and flame retardancy; medical-grade engineering plastics require good biocompatibility and sterility; aerospace-grade engineering plastics require good high-temperature resistance, low weight and high strength.
2. Core Processing Technology of Engineering Plastics: Teknologi Ekstrusi Sekrup Kembar
Engineering plastics processing mainly includes extrusion, cetakan injeksi, cetakan tiup, molding and other methods, among which twin-screw extrusion technology is the core technology for the production of engineering plastic compounds (such as modified engineering plastics, reinforced engineering plastics) and semi-finished products (seperti pipa, lembaran, serat). Dibandingkan dengan teknologi ekstrusi sekrup tunggal, twin-screw extrusion technology has the advantages of strong shearing force, efek pencampuran yang baik, kontrol suhu yang tepat, short residence time and strong adaptability to raw materials, which can effectively solve the processing difficulties of engineering plastics (such as sensitivity to overheating and hydrolytic degradation, poor mixing effect, low processing efficiency) and ensure the quality of engineering plastic products.
2.1 Processing Difficulties of Engineering Plastics and Requirements for Extrusion Equipment
Seperti yang disebutkan sebelumnya, plastik rekayasa memiliki kinerja komprehensif yang sangat baik, tetapi kesulitan pemrosesannya juga lebih tinggi dibandingkan plastik pada umumnya, terutama karena struktur molekul khusus dan karakteristik kinerjanya. Kesulitan pemrosesan utama plastik rekayasa dan persyaratan terkait untuk peralatan ekstrusi adalah sebagai berikut:
2.1.1 Sensitivitas terhadap Panas Berlebih dan Degradasi Hidrolitik
Kebanyakan plastik rekayasa (seperti PA, PBT, PPS) sensitif terhadap panas berlebih dan degradasi hidrolitik. Jika suhu pemrosesan terlalu tinggi atau waktu tinggal di ekstruder terlalu lama, rantai molekul plastik rekayasa akan putus, mengakibatkan dekomposisi termal, yang akan mengurangi sifat mekaniknya, tahan panas dan kinerja produk lainnya, dan bahkan menyebabkan perubahan warna, carbonization and other defects. Selain itu, beberapa plastik rekayasa (seperti PA) mempunyai daya serap air yang tinggi, and the moisture in the material will cause hydrolytic degradation during the high-temperature processing process, affecting the product quality.
This puts forward two key requirements for extrusion equipment: Pertama, precise temperature control capacity, which can strictly control the processing temperature within the optimal range of engineering plastics, avoid local overheating, and the temperature control precision should reach ±1℃; Kedua, waktu tinggal yang singkat, which can reduce the time that the material stays in the extruder barrel, avoid thermal decomposition and hydrolytic degradation. Twin-screw extruders have the advantages of short residence time (biasanya 1-5 menit) dan kontrol suhu yang tepat, which are more suitable for engineering plastics processing than single-screw extruders (waktu tinggal 5-10 menit).
2.1.2 High Requirements on Mixing and Dispersing Effect
In engineering plastics processing, it is often necessary to add modifiers (such as glass fiber, serat karbon, talek, penghambat api, kompatibel) to improve the performance of the product (such as reinforcing, toughening, tahan api). Misalnya, adding glass fiber to PA can improve its strength and dimensional stability; adding flame retardants to PBT can improve its flame retardancy. The uniform mixing and dispersion of modifiers in the engineering plastic matrix is crucial to the performance of the final product. If the mixing and dispersing effect is poor, the modifiers will agglomerate, resulting in uneven performance of the product, and even reduce the mechanical properties of the product.
This requires the extrusion equipment to have strong shearing force and mixing capacity. Twin-screw extruders adopt intermeshing co-rotating or counter-rotating twin-screw structure, dan gerakan relatif antar sekrup dapat menghasilkan gaya geser dan gaya pengadukan yang kuat, yang sepenuhnya dapat mematahkan kumpulan pengubah, membuat pengubah tersebar secara merata dalam matriks plastik rekayasa, dan memastikan efek pencampuran dan pendispersi. Selain itu, desain modular sekrup kembar dapat dengan bebas menggabungkan elemen sekrup yang berbeda (seperti menyampaikan elemen, elemen pencampuran, elemen geser) sesuai dengan jenis plastik rekayasa dan pengubahnya, lebih meningkatkan efek pencampuran dan pendispersi.
2.1.3 Persyaratan Tinggi pada Ketahanan Aus Peralatan
Dalam pengolahan plastik rekayasa yang diperkuat (seperti PA yang diperkuat serat kaca, PPS yang diperkuat serat karbon), serat kaca yang ditambahkan, serat karbon dan pengubah lainnya memiliki kekerasan tinggi, yang akan menyebabkan keausan serius pada sekrup dan laras ekstruder selama proses ekstrusi. Jika sekrup dan laras memiliki ketahanan aus yang buruk, mereka akan cepat aus, mengakibatkan berkurangnya gaya geser dan kapasitas pencampuran ekstruder, mempengaruhi kualitas produk dan mengurangi masa pakai peralatan.
Hal ini memerlukan sekrup dan laras ekstruder terbuat dari bahan tahan aus berkualitas tinggi dan diproses dengan teknologi manufaktur canggih. Pengekstrusi seri HTS kami mengadopsi baja paduan tahan aus yang diimpor untuk sekrup dan laras, dan menjalani perawatan komposit bimetalik atau perawatan kelongsong laser, yang sangat meningkatkan ketahanan aus dan ketahanan korosi pada sekrup dan laras, dan dapat beradaptasi dengan pemrosesan plastik rekayasa yang diperkuat dengan pengubah kekerasan tinggi.
2.1.4 Persyaratan Tinggi pada Fluiditas Pemrosesan dan Kontrol Tekanan
Beberapa plastik rekayasa (seperti PPS, MENGINTIP) memiliki viskositas tinggi dan fluiditas pemrosesan yang buruk, yang mengharuskan ekstruder memiliki kapasitas pengangkutan yang kuat dan kapasitas kontrol tekanan untuk memastikan kelancaran ekstrusi. Jika kapasitas pengangkutan tidak mencukupi atau kontrol tekanan tidak stabil, itu akan menyebabkan kecepatan ekstrusi tidak merata, ukuran produk tidak stabil, dan bahkan penyumbatan peralatan.
Ekstruder sekrup kembar memiliki kapasitas pengangkutan yang kuat dan kapasitas kontrol tekanan yang stabil. Jalinan sekrup kembar dapat menghasilkan tenaga pemompaan yang kuat, yang secara efektif dapat menyampaikan bahan plastik rekayasa viskositas tinggi; pada saat yang sama, the extruder is equipped with a high-precision pressure sensor, which can monitor the extrusion pressure in real time and adjust the screw speed and feeding speed automatically to ensure the stability of the extrusion pressure and the smooth progress of processing.
2.2 Working Principle and Process Flow of Engineering Plastics Twin-Screw Extrusion
The twin-screw extrusion process of engineering plastics is a complex physical and chemical process, which involves the interaction of multiple factors such as temperature, tekanan, shear force and time. The core purpose is to melt and plasticize the engineering plastic raw materials and modifiers, mix them uniformly, and then extrude them into the required shape (such as particles, pipa, lembaran, serat) through the die head. Prinsip kerja spesifik dan alur proses adalah sebagai berikut:
2.2.1 Perlakuan Awal Bahan Baku
Perlakuan awal bahan mentah adalah dasar dari rekayasa pemrosesan ekstrusi plastik, yang secara langsung mempengaruhi efek pemrosesan dan kualitas produk. Bahan baku plastik rekayasa terutama meliputi resin plastik rekayasa (seperti PA, komputer, POM), pengubah (such as glass fiber, serat karbon, talek, penghambat api), kompatibel, pelumas dan bahan tambahan lainnya. Langkah-langkah pra-perawatan adalah sebagai berikut:
- Perawatan Pengeringan: Kebanyakan plastik rekayasa (seperti PA, PBT, PPS) mempunyai daya serap air yang tinggi, dan kelembapan pada bahan mentah akan menyebabkan degradasi hidrolitik selama pemrosesan suhu tinggi, mengakibatkan cacat produk (seperti gelembung, retak, berkurangnya sifat mekanik). Karena itu, bahan mentah harus dikeringkan sebelum diolah. Suhu dan waktu pengeringan ditentukan menurut jenis plastik rekayasa: Misalnya, PA6 dikeringkan pada suhu 80-100℃ untuk 4-6 jam, PA66 dikeringkan pada suhu 100-120℃ untuk 6-8 jam, PBT dikeringkan pada suhu 120-140℃ untuk 2-4 jam, PPS dikeringkan pada suhu 150-160℃ untuk 3-5 jam. Kadar air bahan mentah kering harus dikontrol di bawah ini 0.1%-0.2%.
- Premixing Treatment: Sesuai dengan rumus perbandingannya, the dried engineering plastic resin, modifiers and additives are put into a high-speed mixer for premixing. The purpose of premixing is to make the modifiers and additives uniformly adhere to the surface of the resin particles, improve the mixing effect during extrusion, and avoid local agglomeration of modifiers. Kecepatan pencampuran umumnya 800-1200 rpm, and the mixing time is 5-10 menit. For some modifiers with poor compatibility (such as glass fiber and PA), a compatibilizer should be added during premixing to improve the compatibility between the modifier and the resin.
- Menghancurkan dan Mengayak: For engineering plastic resins with large particle size or modifiers with uneven particle size (such as glass fiber), crushing and sieving treatment should be carried out to ensure the uniformity of raw materials and avoid affecting the mixing and dispersing effect during extrusion. Ukuran partikel bahan mentah yang dihancurkan harus dikontrol pada 20-40 jaring.
2.2.2 Memberi Makan dan Menyampaikan
Bahan mentah yang telah dicampur sebelumnya dikirim ke hopper pengumpan ekstruder sekrup kembar melalui pengumpan sekrup atau pengumpan sabuk. Perangkat pengumpanan ekstruder biasanya dilengkapi dengan fungsi pengaturan kecepatan konversi frekuensi, yang dapat menyesuaikan kecepatan pengumpanan sesuai dengan kecepatan sekrup dan kecepatan ekstrusi untuk memastikan material memasuki rongga ekstrusi secara stabil dan seragam, menghindari akumulasi bahan atau pemberian makanan yang tidak mencukupi. Feed hopper juga dilengkapi dengan alat pengering untuk mencegah bahan mentah menyerap kelembapan lagi selama feeding.
2.2.3 Meleleh, Mencampur dan Menggunting
Bahan yang memasuki rongga ekstrusi ekstruder sekrup kembar didorong ke depan secara terus menerus oleh sekrup yang berputar. Rongga ekstrusi terdiri dari sekrup dan laras, dan volume rongga ekstrusi secara bertahap berkurang sepanjang arah sumbu. Saat sekrup berputar, bahan-bahan tersebut secara bertahap dikompresi di bawah aksi sekrup dan laras, dan tekanan di rongga ekstrusi secara bertahap meningkat (umumnya 5-15MPa).
Pada saat yang sama, material terkena gaya geser dan gaya gesekan yang kuat yang dihasilkan oleh gerakan relatif antara sekrup dan laras, serta di antara penerbangan sekrup. The shear force and friction force can fully break the agglomerates of modifiers, make the modifiers uniformly dispersed in the melted engineering plastic resin, and promote the fusion and compatibility between the modifier and the resin. Gaya gesekan juga dapat menghasilkan sejumlah panas, yang dikombinasikan dengan pemanasan eksternal laras (pemanas listrik atau pemanas uap) to make the engineering plastic resin gradually melt and plasticize.
Laras ekstruder biasanya dibagi menjadi 4-6 bagian pengatur suhu (bagian makan, bagian leleh, bagian pencampuran, bagian homogenisasi, bagian kepala mati), and the temperature of each section is precisely controlled according to the type of engineering plastic. Misalnya, when processing PA66+GF30 (glass fiber reinforced PA66), the temperature of the feeding section is 120-140℃, the melting section is 250-260℃, the mixing section is 260-270℃, the homogenizing section is 250-260℃, and the die head section is 240-250℃. The precise temperature control can ensure that the resin is fully melted without thermal decomposition, dan pengubahnya tersebar secara merata.
2.2.4 Ekstrusi dan Pembentukan
Sepenuhnya meleleh, bahan yang tercampur dan tersebar didorong ke kepala cetakan ekstruder dengan sekrup. Kepala cetakan dirancang sesuai dengan bentuk produk akhir: untuk produksi senyawa plastik rekayasa (butiran), kepala cetakan dilengkapi dengan beberapa lubang cetakan melingkar (jumlah dan ukuran lubang cetakan ditentukan sesuai dengan ukuran partikel butiran); untuk produksi pipa, lembaran, serat, kepala cetakan dirancang menjadi bentuk yang sesuai (seperti cetakan melingkar untuk pipa, cetakan datar untuk lembaran).
Bahan tersebut diekstrusi dari kepala cetakan dengan kecepatan tinggi untuk membentuk produk setengah jadi yang berkesinambungan (seperti strip untuk butiran, pipa, lembaran). Suhu kepala cetakan sedikit lebih rendah dibandingkan suhu bagian homogenisasi, which can prevent the material from decomposing due to excessive temperature and ensure the shaping effect of the semi-finished products. The extrusion speed is controlled according to the type of engineering plastic and the shape of the product, generally ranging from 0.5-5m/min.
2.2.5 Pendinginan dan Solidifikasi
The extruded semi-finished products are sent to a cooling device for rapid cooling and solidification. The cooling method is determined according to the shape of the product: for strips (granule production), water tank cooling is usually used, dan suhu air pendingin dikontrol pada 20-30℃, dan waktu pendinginannya adalah 2-5 menit; for pipes and sheets, air cooling or water spray cooling is used, and the cooling speed should be controlled to avoid product deformation due to uneven cooling. Rapid cooling can make the semi-finished products solidify quickly, maintain the shape and size of the products, and improve the mechanical properties of the products.
2.2.6 Cutting and Post-Processing
Setelah pendinginan dan pemadatan, the semi-finished products are processed into the final product through cutting or other post-processing steps. For the production of engineering plastic compounds (butiran), the cooled strips are sent to a granulator for cutting, and the granulator is equipped with a rotary knife, which can cut the strips into granular products with uniform size (ukuran partikel umumnya 2-5mm, yang dapat disesuaikan dengan kebutuhan pelanggan). For the production of pipes and sheets, the cooled semi-finished products are cut into the required length through a cutting machine; for the production of fibers, filamen yang didinginkan ditarik dan digulung untuk membentuk produk serat.
Selain itu, produk akhir juga perlu menjalani langkah pasca pemrosesan seperti penyaringan, pemeriksaan dan pengemasan. Langkah penyaringannya adalah membuang produk yang tidak memenuhi syarat (misalnya terlalu besar, partikel yang terlalu kecil atau diaglomerasi); langkah inspeksi adalah mendeteksi kinerja (misalnya kekuatan mekanik, tahan panas, akurasi dimensi) produk untuk memastikan bahwa produk tersebut memenuhi kebutuhan pelanggan; langkah pengemasan adalah mengemas produk yang memenuhi syarat dengan cara yang tertutup rapat dan tahan lembab untuk mencegah produk menyerap kelembapan dan mempengaruhi kualitas..
2.3 Faktor Kunci yang Mempengaruhi Efek Ekstrusi Sekrup Kembar Plastik Rekayasa
Efek ekstrusi sekrup kembar secara langsung mempengaruhi kualitas dan kinerja produk plastik rekayasa. Ada banyak faktor yang mempengaruhi efek ekstrusi, terutama termasuk karakteristik bahan baku, rasio rumus, efek pencampuran awal, parameter ekstrusi dan struktur kepala mati. Menguasai faktor-faktor kunci ini dan melakukan penyesuaian ilmiah dapat menjamin stabilitas efek ekstrusi dan konsistensi kualitas produk.
2.3.1 Karakteristik Bahan Baku
Jenisnya, ukuran partikel, kadar air dan kemurnian bahan mentah mempunyai pengaruh yang besar terhadap efek ekstrusi. Misalnya, ukuran partikel resin plastik rekayasa dan pengubahnya harus seragam; jika ukuran partikel tidak merata, itu akan menyebabkan peleburan dan pencampuran bahan yang tidak merata. Kadar air bahan mentah harus dikontrol secara ketat di bawah ini 0.1%-0.2%; jika kadar air terlalu tinggi, itu akan menyebabkan degradasi hidrolitik pada bahan dan gelembung dalam produk. Kemurnian bahan baku juga sangat penting; pengotor pada bahan mentah (seperti logam, batu, debu) tidak hanya akan mempengaruhi kualitas produk, tetapi juga memakai sekrup dan laras ekstruder, dan bahkan menyebabkan penyumbatan peralatan.
2.3.2 Rasio Rumus
Perbandingan rumus senyawa plastik rekayasa (rasio resin, pengubah dan aditif) adalah kunci untuk menentukan kinerja produk. Jenis dan dosis pengubah harus ditentukan sesuai dengan persyaratan kinerja produk. Misalnya, menambahkan 20%-40% serat kaca ke PA dapat secara signifikan meningkatkan kekuatan dan stabilitas dimensinya, namun serat kaca yang berlebihan akan mengurangi ketangguhan dan fluiditas pemrosesan produk. Jenis dan dosis bahan tambahan juga harus disesuaikan secara wajar: compatibilizer dapat meningkatkan kompatibilitas antara pengubah dan resin, dan dosisnya secara umum 0.5%-2%; pelumas dapat mengurangi gesekan antara material dan peralatan, meningkatkan fluiditas pemrosesan, dan dosisnya secara umum 0.3%-1%; antioksidan dapat mencegah bahan dari degradasi oksidasi termal selama pemrosesan, dan dosisnya secara umum 0.1%-0.5%.
2.3.3 Efek Pencampuran Awal
Premixing adalah dasar dari proses ekstrusi. Keseragaman pencampuran secara langsung mempengaruhi efek pencampuran dan pendispersian pengubah selama ekstrusi. Jika premixing tidak merata, pengubah tidak dapat melekat secara seragam pada permukaan resin, menghasilkan aglomerasi pengubah lokal, pencampuran bahan yang tidak merata selama ekstrusi, and reduced product performance. To ensure the premixing effect, it is necessary to control the mixing speed, waktu pencampuran dan suhu pencampuran: the mixing speed is 800-1200 rpm, waktu pencampuran adalah 5-10 menit, dan suhu pencampuran dikontrol pada 40-60℃ (appropriate temperature can improve the adhesion of additives and promote uniform mixing).
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.
- Kecepatan Sekrup: The screw speed of twin-screw extruders for engineering plastics generally ranges from 100 ke 1000 rpm. Our HTS series extruders can reach a maximum speed of 1000 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 modifiers, and the higher the production efficiency. Namun, 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 resin, insufficient mixing of materials, and uneven product quality; if the screw speed is too low, the shear force and friction force are insufficient, the modifiers cannot be fully dispersed, dan efisiensi produksinya rendah. The screw speed should be adjusted according to the type of engineering plastic and the type of modifier: for high-viscosity engineering plastics (seperti PPS, MENGINTIP), a lower screw speed is needed to ensure sufficient melting and mixing; for reinforced engineering plastics (seperti PA yang diperkuat serat kaca), a higher screw speed is needed to ensure the uniform dispersion of glass fiber.
- Suhu Ekstrusi: The extrusion temperature is the key to ensuring the melting and plasticization of engineering plastics. The temperature of each section of the barrel and die head must be precisely controlled according to the type of engineering plastic. Suhu bagian pemberian makan lebih rendah (sedikit lebih tinggi dari suhu pengeringan bahan mentah), yang terutama untuk mencegah bahan menggumpal dan memastikan kelancaran pengumpanan; suhu bagian lelehnya sedang, which is mainly to promote the melting and plasticization of the resin; suhu bagian pencampuran lebih tinggi, yang terutama untuk meningkatkan efek geser dan pencampuran, and promote the uniform dispersion of modifiers; suhu bagian homogenisasi sedikit lebih rendah dari bagian pencampuran, yang terutama untuk memastikan suhu dan viskositas bahan yang seragam, dan menghindari dekomposisi termal; suhu bagian kepala cetakan sedikit lebih rendah dari bagian homogenisasi, which is to ensure the shaping effect of the semi-finished products. The temperature control precision should reach ±1℃ to avoid local overheating and thermal decomposition of the material.
- Tekanan Ekstrusi: The extrusion pressure of engineering plastics twin-screw extrusion generally ranges from 5 to 15MPa. Tekanan dalam rongga ekstrusi terutama ditentukan oleh rasio kompresi sekrup, ukuran lubang cetakan dan kecepatan sekrup. Semakin tinggi tekanan ekstrusi, semakin baik efek pencampuran dan pendispersian bahan, and the denser the product. Namun, jika tekanannya terlalu tinggi, itu akan meningkatkan konsumsi energi dan keausan peralatan, dan bahkan menyebabkan kepala cetakan tersumbat; jika tekanannya terlalu rendah, bahan tidak dapat dikompresi dan dicampur sepenuhnya, the product is loose, and the performance is unstable. The extrusion pressure should be adjusted according to the type of engineering plastic and the shape of the product: for high-viscosity materials and products with small die holes, diperlukan tekanan ekstrusi yang lebih tinggi.
2.3.5 Struktur Kepala Mati
Struktur kepala cetakan terutama mencakup bentuknya, ukuran dan jumlah lubang cetakan, Yang secara langsung mempengaruhi efek pembentukan dan kualitas produk. For the production of engineering plastic compounds (butiran), kepala cetakan harus dilengkapi dengan beberapa lubang cetakan yang seragam, dan ukuran lubang cetakan harus disesuaikan dengan ukuran partikel produk; untuk produksi pipa dan lembaran, kepala cetakan harus dirancang sesuai dengan bentuk dan ukuran produk, dan saluran aliran kepala cetakan harus lancar untuk menghindari penumpukan material dan panas berlebih lokal. Kepala cetakan juga harus dilengkapi dengan perangkat pengatur suhu untuk memastikan suhu kepala cetakan yang seragam dan bentuk produk yang stabil..
3. Extruder Seri HTS kami: Solusi Profesional untuk Rekayasa Pengolahan Plastik
We have long been engaged in the research, development and production of high-performance twin-screw extruders, and have accumulated rich experience in the field of engineering plastics processing. According to the processing characteristics of engineering plastics (sensitivity to overheating and hydrolytic degradation, high requirements on mixing and dispersing effect, viskositas tinggi) and application needs, we have developed the HTS series twin-screw extruders specially for engineering plastics processing. Our HTS series extruders adopt high-torque gearboxes, with a specific torque of 14Nm/cm³ and a maximum speed of up to 1000rpm, which can obtain higher output, shorter residence time, better dispersibility and more precise temperature control, perfectly adapting to the processing needs of various engineering plastics.
3.1 Keunggulan Inti Ekstruder Seri HTS untuk Rekayasa Pemrosesan Plastik
3.1.1 Torsi Tinggi dan Kecepatan Tinggi, Efisiensi Produksi Tinggi
Plastik rekayasa memiliki viskositas tinggi dan fluiditas pemrosesan yang buruk, yang mengharuskan ekstruder memiliki torsi dan kapasitas pengangkutan yang kuat. Ekstruder seri HTS kami mengadopsi gearbox torsi tinggi yang dikembangkan dan diproduksi secara independen oleh kami (Seri HTS PLUS dan seri HTS SUPER) atau diimpor dari produsen terkemuka Eropa (Seri HTS DASAR), dengan torsi spesifik 14Nm/cm³, yang jauh lebih tinggi dibandingkan ekstruder sekrup kembar biasa (torsi umum adalah 8-12Nm/cm³). Desain torsi tinggi memastikan bahwa ekstruder dapat membawa material plastik rekayasa dengan viskositas tinggi secara stabil, menghindari akumulasi material dan penyumbatan peralatan, dan meningkatkan stabilitas proses ekstrusi.
Pada saat yang sama, the HTS series extruders have a high speed design, with a maximum speed of up to 1000rpm. The high speed can generate strong shear force and mixing force, yang sepenuhnya dapat mematahkan kumpulan pengubah, make the modifiers uniformly dispersed in the resin matrix, and improve the mixing and dispersing effect. Selain itu, the high speed design also greatly improves the production efficiency: dibandingkan dengan ekstruder biasa, the production efficiency of HTS series extruders can be increased by 30%-50%, which can meet the large-scale production needs of engineering plastics enterprises.
3.1.2 Short Residence Time, Effectively Avoiding Thermal Degradation
As engineering plastics are sensitive to overheating and hydrolytic degradation, the residence time of materials in the extruder is crucial. Our HTS series extruders adopt an optimized screw structure and barrel design, with a short residence time of only 1-3 menit, which is much shorter than that of ordinary twin-screw extruders (5-10 menit) and single-screw extruders (10-15 menit). The short residence time can effectively reduce the contact time between the material and high temperature, avoid thermal decomposition and hydrolytic degradation of the material, and ensure the mechanical properties and heat resistance of the product.
Selain itu, the screw of the HTS series extruders adopts a modular design, and different screw elements can be freely combined according to the type of engineering plastic, which can further adjust the residence time of the material, ensuring that different types of engineering plastics can obtain the optimal residence time during processing.
3.1.3 Kontrol Suhu Yang Tepat, Stable Performance
Pengekstrusi seri HTS mengadopsi sistem kontrol suhu cerdas yang canggih, yang dapat mewujudkan kontrol yang tepat terhadap suhu setiap bagian laras dan kepala cetakan. Presisi kontrol suhu bisa mencapai ±1℃, which can strictly control the processing temperature within the optimal range of engineering plastics, hindari panas berlebih lokal dan dekomposisi termal material. Sistem pengatur suhu dilengkapi dengan fungsi pemantauan dan alarm waktu nyata: jika suhu bagian mana pun melebihi kisaran yang ditetapkan, sistem akan mengeluarkan peringatan alarm tepat waktu, dan bahkan secara otomatis menyesuaikan daya pemanas atau mematikan peralatan jika perlu, untuk menghindari kegagalan peralatan dan masalah kualitas produk.
Selain itu, laras ekstruder seri HTS mengadopsi desain jaket dua lapis, yang dapat mewujudkan pemanasan dan pendinginan yang cepat, dan meningkatkan kecepatan respons kontrol suhu. Kepala cetakan juga dilengkapi dengan perangkat pengatur suhu independen, yang memastikan suhu seragam kepala cetakan dan pembentukan produk yang stabil.
3.1.4 Efek Pencampuran dan Pendispersian yang Sangat Baik
Pengekstrusi seri HTS mengadopsi struktur sekrup kembar yang berputar bersama, dengan pitch sekrup yang masuk akal, desain rasio timbal dan kompresi. Jalinan dan putaran sekrup kembar dapat menghasilkan gaya geser dan gaya pengadukan yang kuat, yang sepenuhnya dapat mematahkan kumpulan pengubah (such as glass fiber, serat karbon, talek), make the modifiers uniformly dispersed in the engineering plastic resin matrix, dan memastikan efek pencampuran dan pendispersi. The mixing uniformity of the HTS series extruders can reach more than 95%, yang jauh lebih tinggi dibandingkan ekstruder sekrup kembar biasa (85%-90%).
The screw of the HTS series extruders adopts a modular design, and different types of screw elements (seperti menyampaikan elemen, elemen pencampuran, elemen geser) can be freely combined according to the type of engineering plastic and modifier. Misalnya, when processing reinforced engineering plastics with glass fiber, more shearing elements can be configured to enhance the shearing effect and ensure the uniform dispersion of glass fiber; when processing engineering plastics with high viscosity (seperti PPS), more mixing elements can be configured to improve the mixing effect and ensure the uniform viscosity of the material.
3.1.5 Ketahanan Aus yang Tinggi, Umur Panjang
Dalam pengolahan plastik rekayasa yang diperkuat (seperti PA yang diperkuat serat kaca, PPS yang diperkuat serat karbon), the added modifiers have high hardness, which will cause serious wear to the screw and barrel of the extruder. Our HTS series extruders adopt high-quality wear-resistant materials and advanced manufacturing technology to ensure the wear resistance of the core components.
The screw and barrel of the HTS series extruders are made of imported wear-resistant alloy steel (seperti 38CrMoAlA), dan menjalani perawatan komposit bimetalik atau perawatan kelongsong laser. The surface hardness of the screw and barrel can reach ≥65 HRC (Seri HTS DASAR) dan ≥70 HRC (Seri HTS PLUS dan seri HTS SUPER), yang memiliki ketahanan aus dan ketahanan korosi yang sangat kuat, and can effectively resist the wear caused by high-hardness modifiers. This greatly extends the service life of the screw and barrel: the service life of the screw and barrel of the HTS series extruders is 2-3 kali lipat dari ekstruder biasa, mengurangi frekuensi penggantian komponen dan biaya pemeliharaan peralatan.
Selain itu, we also provide professional wear detection services for the screw and barrel. Our technical team will regularly detect the wear degree of the screw and barrel for customers, issue a detailed wear report, and put forward targeted replacement and maintenance suggestions, ensuring that customers only replace components when necessary, avoiding unnecessary waste.
3.1.6 Rentang Aplikasi yang Luas, Strong Flexibility
The HTS series extruders have a wide application range, which can adapt to the processing needs of various engineering plastics, including general engineering plastics (PA, komputer, POM, PELIHARAAN, PBT) and special engineering plastics (PPS, MENGINTIP, PSU, PES). The extruders can also adapt to the processing of various modified engineering plastics, such as reinforced engineering plastics (glass fiber reinforced, carbon fiber reinforced), toughened engineering plastics, flame-retardant engineering plastics, antistatic engineering plastics, dll..
The modular design of the HTS series extruders (baut, barel, mati kepala, dll.) makes the replacement of components more convenient and quick. When customers need to adjust the product type (such as switching from PA processing to PPS processing) or modify the formula, they only need to replace the corresponding components, tanpa mengganti seluruh peralatan, which reduces the cost of equipment transformation and improves the flexibility and adaptability of the equipment. Selain itu, the HTS series extruders can also be matched with different auxiliary equipment (such as high-speed mixers, pengering, pendingin, granulator, screening machines, packaging machines) untuk membentuk jalur produksi otomatis yang lengkap, realizing continuous production from raw material pretreatment to product packaging.
3.1.7 Intelligent Control, Easy Operation and Maintenance
The HTS series 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. When customers produce different types of engineering plastics, they only need to call the corresponding formula and parameters, 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, tekanan, kecepatan sekrup, kecepatan makan) 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, pemantauan data produksi dan pemeliharaan prediktif peralatan, mewujudkan manajemen produksi yang cerdas.
Selain itu, ekstruder seri HTS mengadopsi desain struktural yang masuk akal, Yang membuat pemeliharaan lebih nyaman. Sekrup, barel, die head dan komponen lainnya dapat dibongkar dan dirakit dengan cepat, Yang mengurangi waktu pemeliharaan dan intensitas tenaga kerja. Tim layanan purna jual kami akan menyediakan instalasi profesional, layanan commissioning dan pelatihan untuk pelanggan, memastikan bahwa pelanggan dapat menggunakan peralatan dengan lancar.
3.2 Jenis Produk Extruder Seri HTS dan Adaptasinya pada Plastik Rekayasa
Untuk memenuhi beragam kebutuhan pemrosesan perusahaan plastik rekayasa dengan skala dan jenis produk yang berbeda, kami telah meluncurkan tiga jenis produk utama dalam seri HTS: Seri HTS DASAR, Seri HTS PLUS dan seri HTS SUPER. Setiap seri memiliki karakteristik dan skenario adaptasi yang ditargetkan, yang dapat dipilih oleh pelanggan sesuai dengan skala produksinya sendiri, jenis produk, anggaran dan faktor lainnya.
3.2.1 HTS BASIC Series Extruders: Flexible and Cost-Effective Choice for General Engineering Plastics
The HTS BASIC series extruders are a cost-effective product series designed for engineering plastics processing enterprises with medium and small production scales or initial entry into the industry. This series of extruders uses medium-torque gearboxes from leading European manufacturers, which have the advantages of stable performance, kebisingan rendah, high efficiency and long service life. The medium-torque design (torsi spesifik 10-12Nm/cm³) can meet the processing needs of most general engineering plastics (such as PA6, PA66, POM, PELIHARAAN, PBT) and low-to-medium modified engineering plastics (such as glass fiber reinforced PA with filling amount ≤30%).
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 engineering plastic. 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, kontrol suhu otomatis, 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 medium and small-sized engineering plastics processing enterprises that mainly produce general engineering plastics and low-to-medium modified engineering plastics. 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, mati kepala, feeding devices, drying devices and post-processing equipment according to their own product types, production capacity and budget, so as to form a production line suitable for their own needs. The HTS BASIC series extruders have a reasonable price, which can help enterprises reduce the initial investment cost.
3.2.2 HTS PLUS Series Extruders: High-Performance Choice for Engineering Plastics and Modified Products
Ekstruder seri HTS PLUS mengadopsi gearbox torsi tinggi yang dikembangkan dan diproduksi secara independen oleh kami, dengan torsi spesifik 14Nm/cm³, yang memiliki torsi dan daya dukung beban lebih kuat dibandingkan seri HTS BASIC. Rangkaian ekstruder ini terutama dirancang untuk pemrosesan plastik rekayasa berkinerja tinggi, plastik rekayasa modifikasi tinggi dan plastik rekayasa khusus (seperti PPS), yang cocok untuk perusahaan pengolahan plastik rekayasa skala menengah dan besar yang mengejar kinerja tinggi dan efisiensi tinggi.
Ekstruder seri HTS PLUS memiliki diameter sekrup mulai dari 65mm hingga 110mm, rasio kompresi 5～10, dan rentang kecepatan sekrup 200～800 rpm. Sekrup dan laras mengadopsi perlakuan komposit bimetalik, yang memiliki ketahanan aus dan ketahanan korosi yang lebih tinggi (kekerasan permukaan ≥65 HRC), dan dapat beradaptasi dengan pemrosesan plastik rekayasa yang diperkuat dengan jumlah pengisian yang tinggi (seperti PA yang diperkuat serat kaca dengan jumlah pengisian 30%-50%, PPS yang diperkuat serat karbon) dan pengubah kekerasan tinggi. Ekstruder dilengkapi dengan sistem kontrol suhu cerdas yang canggih dan sensor tekanan presisi tinggi, yang dapat mewujudkan kontrol yang tepat terhadap parameter ekstrusi dan pemantauan data produksi secara real-time, memastikan stabilitas proses ekstrusi dan kualitas produk.
Kapasitas produksi ekstruder seri HTS PLUS berkisar antara 500kg/jam hingga 2000kg/jam, yang cocok untuk produksi plastik rekayasa umum skala besar, plastik rekayasa modifikasi tinggi dan plastik rekayasa khusus (seperti PPS). Rangkaian ekstruder ini memiliki efek pencampuran dan pendispersian yang sangat baik, waktu tinggal yang singkat dan efisiensi produksi yang tinggi, yang secara efektif dapat mengatasi kesulitan pemrosesan plastik rekayasa dengan viskositas tinggi dan modifikasi tinggi, dan membantu perusahaan meningkatkan kualitas produk dan efisiensi produksi.
3.2.3 Ekstruder Seri SUPER HTS: Pilihan Terbaik untuk Plastik Rekayasa Kelas Atas
Ekstruder seri HTS SUPER mengadopsi perangkat transmisi torsi ultra-tinggi terbaru yang kami kembangkan secara independen, with a specific torque of 14Nm/cm³ and a maximum speed of up to 1000rpm. Mengincar karakteristik torsi tinggi dan kecepatan tinggi dari seri ini, desain struktural setiap komponen utama ekstruder telah dioptimalkan sepenuhnya, yang merupakan seri ekstruder kelas atas kami, mewakili tingkat lanjutan pengembangan ekstruder Tiongkok. Rangkaian ekstruder ini terutama dirancang untuk pemrosesan plastik rekayasa khusus kelas atas (seperti MENGINTIP, PI, PSU, PES) dan plastik rekayasa termodifikasi berkinerja tinggi (such as carbon fiber reinforced PEEK, glass fiber reinforced PI), which is suitable for large-scale high-end engineering plastics processing enterprises that pursue high precision, high performance and intelligence.
The HTS SUPER series extruders have a screw diameter ranging from 80mm to 130mm, a compression ratio of 6～12, and a screw speed range of 250～1000 rpm. The screw and barrel adopt imported wear-resistant alloy steel and laser cladding technology, which has extremely high wear resistance and corrosion resistance (kekerasan permukaan ≥70 HRC), and can adapt to the processing of special engineering plastics with high temperature resistance, high viscosity and high-hardness modifiers. The extruder is equipped with an intelligent PLC + cloud touch screen control system, which can realize remote parameter adjustment, pemantauan data produksi, predictive maintenance of equipment and data analysis, mewujudkan manajemen produksi yang cerdas.
The production capacity of the HTS SUPER series extruders ranges from 1000kg/h to 3000kg/h, which is suitable for the large-scale production of high-end special engineering plastics and high-performance modified engineering plastics. This series of extruders has the advantages of high precision, strong customization, multi-function and stable performance, which can meet the most stringent processing requirements of high-end engineering plastics. The short residence time (1-2 menit) and precise temperature control can effectively avoid the thermal decomposition of special engineering plastics, ensuring the excellent performance of the product. Selain itu, the HTS SUPER series extruders can also be customized according to the special processing needs of customers, providing personalized solutions.
3.3 Selection Suggestions for Engineering Plastics Extruders
When selecting twin-screw extruders for engineering plastics processing, enterprises need to comprehensively consider their own production needs, product types, processing scale, budget and other factors to ensure that the selected equipment can meet the actual processing needs and bring maximum economic benefits. The following are some specific selection suggestions:
3.3.1 Determine the Extruder Series According to the Type of Engineering Plastics
Different types of engineering plastics have different processing requirements, which determine the selection of extruder series. For general engineering plastics (PA6, PA66, POM, PELIHARAAN, PBT) with low modification degree (filling amount ≤30%), the HTS BASIC series is sufficient to meet the processing needs. Its medium torque and flexible configuration can balance processing effect and cost, which is very suitable for small and medium-sized enterprises that just start to engage in engineering plastics processing or focus on general-purpose products. For high-modified engineering plastics (jumlah pengisian 30%-50%, seperti PA yang diperkuat serat kaca, carbon fiber reinforced PBT) and special engineering plastics with moderate processing difficulty (seperti PPS), the HTS PLUS series is the preferred choice. Its high torque of 14Nm/cm³ and excellent mixing and dispersing capacity can effectively solve the problem of uneven dispersion of high-content modifiers, and its wear-resistant screw and barrel can adapt to the wear of hard modifiers, ensuring stable production. For high-end special engineering plastics (MENGINTIP, PI, PSU, PES) dan plastik rekayasa termodifikasi berkinerja tinggi (filling amount ≥50%, such as carbon fiber reinforced PEEK), the HTS SUPER series must be selected. Its ultra-high torque, kecepatan maksimum 1000rpm dan struktur kunci yang dioptimalkan sepenuhnya dapat mengatasi viskositas tinggi, ketahanan suhu tinggi dan persyaratan pemrosesan yang ketat dari bahan kelas atas, menghindari dekomposisi termal dan degradasi material, dan memastikan kinerja tinggi dari produk akhir.
3.3.2 Tentukan Diameter Sekrup dan Kapasitas Produksi Sesuai Skala Pengolahan
Diameter sekrup ekstruder sekrup kembar secara langsung menentukan kapasitas produksi, dan perusahaan perlu memilih diameter sekrup yang sesuai dengan skala produksi dan permintaan pesanan mereka sendiri. Untuk produksi skala kecil (100kg/jam – 500kg/jam), seperti kustomisasi dalam jumlah kecil, penelitian dan pengembangan produk atau pesanan kecil, seri HTS BASIC dengan diameter sekrup 30mm – 65mm cocok; untuk produksi skala menengah (500kg/jam – 2000kg/jam), such as mass production of general modified engineering plastics, the HTS PLUS series with screw diameter of 65mm – 110mm can meet the demand; for large-scale production (1000kg/jam – 3000kg/jam), such as large-scale production of high-end special engineering plastics or large orders from downstream enterprises, the HTS SUPER series with screw diameter of 80mm – 130mm is the best choice. It should be noted that when selecting, enterprises should not blindly pursue large production capacity. They should also consider the fluctuation of order quantity. If the order quantity is unstable, they can choose equipment with adjustable speed and flexible production capacity (such as HTS BASIC series with frequency conversion speed regulation function) to avoid waste of equipment resources and energy.
3.3.3 Consider the Modification Demand and Mixing Effect
Jika produk utama perusahaan adalah plastik rekayasa yang dimodifikasi, efek pencampuran dan pendispersian ekstruder adalah faktor kunci yang harus dipertimbangkan. Untuk produk yang perlu menambahkan berbagai pengubah (seperti penghambat api, kompatibel, agen penguat) pada saat yang sama, penting untuk memilih ekstruder dengan kinerja pencampuran yang sangat baik, seperti seri HTS PLUS dan seri HTS SUPER dengan elemen sekrup pencampur modular. Kedua seri ini dapat dengan bebas menggabungkan elemen penyampaian, elemen pencampur dan elemen geser sesuai dengan jenis pengubahnya, sesuaikan intensitas pencampuran dan waktu tinggal, dan memastikan bahwa berbagai pengubah tersebar secara merata dalam matriks resin. Misalnya, saat memproses PBT modifikasi tahan api, lebih banyak elemen pencampur dapat dikonfigurasi untuk memastikan dispersi penghambat api yang seragam, menghindari ketidakcukupan penghambatan api lokal; saat memproses PA yang diperkuat serat kaca, lebih banyak elemen geser dapat dikonfigurasi untuk memecah aglomerasi serat kaca dan meningkatkan kekuatan ikatan antara serat kaca dan resin. Selain itu, jika perusahaan memiliki permintaan modifikasi multi-variasi dan skala kecil, disarankan untuk memilih ekstruder dengan penggantian elemen sekrup yang cepat (seperti desain sekrup modular seri HTS), yang dapat mengurangi waktu penyesuaian peralatan dan meningkatkan efisiensi produksi.
3.3.4 Pertimbangkan Anggaran Biaya dan Manfaat Komprehensif
Anggaran biaya merupakan faktor penting bagi perusahaan untuk memilih peralatan, namun tidak disarankan untuk mengejar biaya rendah secara membabi buta. Hal ini diperlukan untuk menyeimbangkan biaya pembelian awal, biaya pemeliharaan selanjutnya, konsumsi energi dan efisiensi produksi untuk memaksimalkan manfaat komprehensif. Seri HTS BASIC memiliki biaya pembelian awal terendah, konsumsi energi rendah dan perawatan sederhana, yang cocok untuk perusahaan dengan anggaran terbatas dan skala produksi kecil; seri HTS PLUS memiliki biaya pembelian awal yang moderat, tetapi efisiensi produksinya tinggi, masa pakai yang lama dan efek pemrosesan yang stabil dapat mengurangi biaya pemeliharaan di kemudian hari dan meningkatkan tingkat kualifikasi produk, yang cocok untuk perusahaan menengah dan besar dengan anggaran tertentu dan mengejar kinerja tinggi; seri HTS SUPER memiliki biaya pembelian awal tertinggi, namun dapat mengolah produk-produk kelas atas dengan nilai tambah yang tinggi, and its intelligent control and long service life can reduce labor cost and maintenance cost in the later period, which is suitable for large-scale enterprises with sufficient budget and focus on high-end market. Selain itu, enterprises should also consider the after-sales service of the equipment. Our HTS series extruders provide a complete after-sales service system, termasuk instalasi, komisioning, pelatihan teknis, regular maintenance and quick replacement of spare parts, which can reduce the later operation risk of enterprises.
3.3.5 Consider the Compatibility with Auxiliary Equipment
Twin-screw extrusion processing of engineering plastics needs to be matched with a series of auxiliary equipment, such as raw material drying equipment, pengaduk berkecepatan tinggi, cooler, granulator, screening machine, packaging machine, dll.. When selecting the extruder, enterprises need to consider the compatibility between the extruder and auxiliary equipment to ensure the smooth operation of the entire production line. Our HTS series extruders can be perfectly matched with various standard auxiliary equipment, and can also be customized according to the enterprise’s existing auxiliary equipment to avoid the waste caused by the incompatibility between new equipment and old auxiliary equipment. Misalnya, if the enterprise already has a high-speed mixer with a mixing capacity of 500kg, it can select the HTS PLUS series extruder with a production capacity of 500kg/h – 800kg/h to match it, ensuring the coordination of raw material premixing and extrusion production.
4. Application Fields of Engineering Plastics and Matching HTS Series Extruder Solutions
Plastik rekayasa, dengan kinerja komprehensifnya yang luar biasa, telah banyak digunakan dalam bidang otomotif, listrik dan elektronik, medis, luar angkasa, kimia, konstruksi dan bidang lainnya. Bidang aplikasi yang berbeda memiliki persyaratan berbeda terhadap kinerja produk plastik rekayasa, yang juga mengedepankan persyaratan berbeda pada peralatan pemrosesan ekstrusi. Di bawah, kami akan menguraikan karakteristik penerapan plastik rekayasa di bidang utama dan solusi ekstruder seri HTS yang cocok, memberikan referensi yang ditargetkan untuk perusahaan di berbagai bidang.
4.1 Bidang Otomotif: Ringan, Tahan Suhu Tinggi dan Tahan Aus
Dengan berkembangnya otomotif yang ringan dan hemat energi serta pengurangan emisi, plastik rekayasa telah menjadi bahan penting untuk suku cadang otomotif, secara bertahap menggantikan bahan logam tradisional. The engineering plastics used in the automotive field mainly include PA, POM, komputer, PBT, PPS, dll., which are mainly used in engine parts, interior parts, exterior parts and electrical components. The core requirements for extrusion processing are: ringan, high temperature resistance, ketahanan aus, dimensional stability and low VOC (senyawa organik yang mudah menguap), which require the extruder to have precise temperature control, excellent mixing and dispersing effect and stable production capacity.
For automotive interior parts (such as instrument panels, panel pintu, saluran udara) made of general engineering plastics (PA6, POM, PC/ABS alloy), the HTS BASIC series extruders can meet the processing needs. Its flexible configuration can adjust the processing parameters according to the performance requirements of interior parts, ensure the smooth surface and dimensional stability of the product, and its low energy consumption and cost can reduce the production cost of automotive parts. For automotive engine parts (such as intake manifolds, cylinder head covers, oil pans) made of high-temperature resistant and wear-resistant engineering plastics (PA66+GF30, PPS), the HTS PLUS series extruders are more suitable. Its high torque and excellent mixing and dispersing effect can ensure the uniform dispersion of glass fiber, improve the strength and high temperature resistance of the product, and its wear-resistant screw and barrel can adapt to the wear of glass fiber, ensuring long-term stable production. For high-end new energy vehicle parts (such as battery shell, motor insulation parts) made of high-end special engineering plastics (MENGINTIP, PI), the HTS SUPER series extruders are required. Its ultra-high torque, kontrol suhu yang tepat dan waktu tinggal yang singkat dapat menghindari dekomposisi termal bahan tahan suhu tinggi, memastikan kinerja isolasi dan ketahanan korosi produk, dan memenuhi persyaratan ketat kendaraan energi baru dalam hal kinerja suku cadang.
Studi Kasus: Produsen suku cadang otomotif besar yang mengkhususkan diri pada suku cadang baterai kendaraan energi baru memilih ekstruder seri HTS SUPER kami (diameter sekrup 100mm) untuk memproses cangkang baterai MENGINTIP yang diperkuat serat karbon. Bahan PEEK memiliki viskositas tinggi dan tahan suhu tinggi, dan jumlah pengisian serat karbon mencapai 40%, yang memiliki persyaratan yang sangat tinggi pada peralatan ekstrusi. Ekstruder seri HTS SUPER, dengan torsi ultra tinggi 14Nm/cm³ dan kecepatan maksimum 1000rpm, menghasilkan gaya geser dan gaya pencampuran yang kuat, which makes the carbon fiber uniformly dispersed in the PEEK matrix; the precise temperature control system (precision ±1℃) strictly controls the processing temperature at 380-400℃, avoiding thermal decomposition of PEEK; the short residence time (1.5 menit) effectively reduces the material degradation, ensuring the strength and insulation performance of the battery shell. After using the HTS SUPER series extruders, the production efficiency of the enterprise is increased by 40%, the product qualification rate is increased from 88% ke 99%, and the production cost is reduced by 15%, which has won high recognition from the enterprise.
4.2 Electrical and Electronic Field: Isolasi Listrik, Flame Retardancy and Dimensional Stability
The electrical and electronic field is one of the earliest and most widely used fields of engineering plastics. Engineering plastics are mainly used in electrical connectors, papan kabel, relays, motor, cable ties, lamp covers and other components. The core requirements for extrusion processing are: excellent electrical insulation, ketahanan api, stabilitas dimensi, corrosion resistance and low toxicity, which require the extruder to have precise temperature control, good mixing and dispersing effect and strict quality control capacity.
For general electrical components (such as cable ties, konektor) made of general engineering plastics (PA6, PBT, komputer), the HTS BASIC series extruders are suitable. Its flexible configuration can match different die heads to produce components of different shapes and sizes; the precise temperature control ensures the electrical insulation performance of the product, and the low cost can meet the mass production needs of general electrical components. For high-precision electrical components (such as relays, motor windings) made of flame-retardant modified engineering plastics (PBT+GF30+flame retardant, PA66+flame retardant), the HTS PLUS series extruders are preferred. Its high mixing and dispersing effect can ensure the uniform dispersion of flame retardants, menghindari ketidakcukupan penghambatan api lokal, and meet the UL94 V-0 flame retardant standard; the precise dimensional control can ensure the dimensional accuracy of high-precision components, avoiding assembly failure. For high-end electrical components (such as high-temperature resistant connectors, aerospace electrical components) made of special engineering plastics (PPS, PSU, PES), the HTS SUPER series extruders are required. Its ultra-high torque and excellent wear resistance can cope with the high viscosity and high hardness of special engineering plastics, and the precise temperature control and short residence time can ensure the electrical insulation performance and high temperature resistance of the product, meeting the strict requirements of high-end electrical and electronic products.
4.3 Medical Field: Biocompatibility, Sterility and Precision
The medical field has extremely strict requirements on materials, and engineering plastics used in the medical field must have good biocompatibility, sterility, corrosion resistance and dimensional stability, and must not produce toxic and harmful substances. The main engineering plastics used in the medical field include PC, PA, MENGINTIP, PSU, dll., which are mainly used in medical containers, kateter medis, implan medis, surgical instruments and other products. The core requirements for extrusion processing are: presisi tinggi, no pollution, kinerja yang stabil, which require the extruder to have high cleanliness, precise temperature control and strict quality control capacity.
For general medical products (such as medical containers, ordinary catheters) made of medical-grade general engineering plastics (medical-grade PC, medical-grade PA), the HTS BASIC series extruders with special cleanliness configuration can meet the requirements. We can customize the screw and barrel with high cleanliness, no dead angle design for the HTS BASIC series, avoid material residue and pollution, and match the sterile feeding and packaging system to ensure the sterility of the product. For high-precision medical products (such as precision catheters, implan medis) made of medical-grade special engineering plastics (MENGINTIP tingkat medis, medical-grade PSU), the HTS SUPER series extruders with high-precision configuration are required. Its fully optimized screw structure and precise temperature control can ensure the dimensional accuracy of the product (tolerance ≤±0.01mm), and the clean production environment and no pollution design can meet the biocompatibility requirements of medical products; the cloud control function can realize real-time monitoring and recording of the production process, which is convenient for medical product traceability and meets the GMP (Praktek Manufaktur yang Baik) requirements of the medical field.
4.4 Aerospace Field: High Temperature Resistance, Low Weight and High Strength
The aerospace field has extremely high requirements on the performance of materials, and engineering plastics used in the aerospace field must have excellent high temperature resistance, low weight, high strength, corrosion resistance and radiation resistance. The main engineering plastics used in the aerospace field include PEEK, PI, PSU, PES, dll., which are mainly used in aerospace components, aircraft interior parts, satellite components and other products. The core requirements for extrusion processing are: ultra-high precision, ultra-high temperature resistance, kinerja yang stabil, which require the extruder to have the highest level of torque, speed and temperature control capacity.
Due to the extremely strict processing requirements of aerospace-grade engineering plastics, only the HTS SUPER series extruders can meet the demand. Its ultra-high torque transmission device, maximum 1000rpm speed and fully optimized key components can cope with the high viscosity and high temperature resistance of aerospace-grade materials (long-term use temperature up to 300℃); the laser-clad screw and barrel have extremely high wear resistance and corrosion resistance, which can adapt to the processing of high-hardness modifiers (such as carbon fiber, ceramic fiber); the intelligent PLC + cloud touch screen control system can realize precise control of extrusion parameters, and the remote monitoring and predictive maintenance function can ensure the stable operation of equipment in long-term continuous production; the customizable configuration can meet the special processing needs of various aerospace components, ensuring the high performance and high reliability of the product.
4.5 Chemical Field: Corrosion Resistance and Wear Resistance
The chemical field has harsh working environment, and engineering plastics used in the chemical field must have excellent corrosion resistance, ketahanan aus, high temperature resistance and pressure resistance. The main engineering plastics used in the chemical field include PPS, MENGINTIP, PVDF (polyvinylidene fluoride), dll., which are mainly used in chemical equipment, pipelines, valves, pumps and other products. The core requirements for extrusion processing are: ketahanan terhadap korosi, ketahanan aus, kinerja yang stabil, which require the extruder to have excellent wear resistance and corrosion resistance, and stable pressure control capacity.
For chemical pipelines and valves made of general corrosion-resistant engineering plastics (PPS, PVDF), the HTS PLUS series extruders are suitable. Its bimetallic composite screw and barrel have excellent corrosion resistance and wear resistance, which can adapt to the corrosion of chemical media and the wear of materials; the stable pressure control capacity can ensure the uniform wall thickness of pipelines and valves, avoiding leakage caused by uneven wall thickness. For high-pressure chemical equipment and corrosion-resistant components made of high-end corrosion-resistant engineering plastics (MENGINTIP, PI), the HTS SUPER series extruders are required. Its ultra-high torque and stable conveying capacity can cope with the high viscosity of high-end corrosion-resistant materials, and the laser-clad screw and barrel have extremely high corrosion resistance and wear resistance, which can meet the long-term use requirements in harsh chemical environments; the precise temperature control can avoid thermal decomposition of materials, ensuring the corrosion resistance and pressure resistance of the product.
5. Common Problems and Solutions in Engineering Plastics Twin-Screw Extrusion Processing
In the actual twin-screw extrusion processing of engineering plastics, due to the influence of raw materials, processing parameters, equipment performance and other factors, berbagai permasalahan sering terjadi, which affect the product quality and production efficiency. Di bawah, we will summarize the common problems in engineering plastics extrusion processing, analyze their causes, and provide corresponding solutions combined with the characteristics of our HTS series extruders, helping enterprises solve practical processing problems and improve production efficiency.
5.1 Masalah 1: Thermal Decomposition and Discoloration of Materials
Symptoms: During the extrusion process, the material appears yellowing, blackening, carbonization and other phenomena, and the final product has discoloration, gelembung, cracks and other defects, and the mechanical properties are significantly reduced. This problem is mainly caused by the sensitivity of engineering plastics to overheating and hydrolytic degradation.
Penyebab: 1. The extrusion temperature is too high or the temperature of a certain section of the barrel is too high, resulting in thermal decomposition of the material; 2. The residence time of the material in the extruder is too long, leading to excessive heating and decomposition; 3. The raw materials are not dried thoroughly, and the moisture in the materials causes hydrolytic degradation during high-temperature processing; 4. The screw speed is too low, resulting in insufficient shear force and prolonged residence time; 5. The flow channel of the die head is blocked, resulting in material accumulation and local overheating.
Solusi: 1. Adjust the extrusion temperature according to the type of engineering plastic, strictly control the temperature of each section of the barrel and die head within the optimal range, and use the precise temperature control function of the HTS series extruders (presisi kontrol suhu ±1℃) to avoid local overheating; 2. Increase the screw speed appropriately (within the range suitable for the material) to shorten the residence time of the material. The HTS series extruders can reach a maximum speed of 1000rpm, which can effectively shorten the residence time to 1-3 menit; 3. Strengthen the drying treatment of raw materials, strictly control the moisture content below 0.1%-0.2%, and use the drying device matched with the HTS series extruders to prevent the raw materials from absorbing moisture again during feeding; 4. Check and clean the die head regularly to ensure the smooth flow channel, avoid material accumulation; 5. If the problem persists, adjust the screw element combination, increase the number of conveying elements, and reduce the number of mixing elements to speed up the material conveying and shorten the residence time.
5.2 Masalah 2: Uneven Dispersion of Modifiers
Symptoms: The final product has uneven texture, obvious agglomeration of modifiers (such as glass fiber, serat karbon), and the mechanical properties (kekuatan, kekerasan, ketahanan aus) are uneven, which cannot meet the use requirements. This problem is common in the processing of modified engineering plastics.
Penyebab: 1. The premixing effect of raw materials is poor, and the modifiers are not uniformly adhered to the surface of the resin; 2. The screw speed is too low, resulting in insufficient shear force and kneading force, and the modifiers cannot be fully broken and dispersed; 3. The combination of screw elements is unreasonable, and the number of mixing elements and shearing elements is insufficient; 4. The extrusion temperature is too low, the material is not fully melted, and the modifiers cannot be uniformly dispersed in the resin matrix; 5. The particle size of the modifier is too large or uneven.
Solusi: 1. Optimize the premixing process, increase the mixing speed (800-1200rpm) and mixing time (5-10 menit), add an appropriate amount of compatibilizer to improve the compatibility between the modifier and the resin, and use a high-speed mixer matched with the HTS series extruders to ensure uniform premixing; 2. Increase the screw speed appropriately, use the high-speed performance of the HTS series extruders to generate strong shear force and kneading force, and fully break the agglomerates of modifiers; 3. Adjust the combination of screw elements, increase the number of mixing elements and shearing elements, and use the modular screw design of the HTS series extruders to customize the optimal screw combination according to the type of modifier; 4. Properly increase the extrusion temperature to ensure that the material is fully melted, which is conducive to the uniform dispersion of modifiers; 5. Crush and sieve the modifier to ensure that its particle size is uniform (20-40 jaring) and meets the processing requirements.
5.3 Masalah 3: Wear of Screw and Barrel
Symptoms: After a period of use, the extrusion capacity of the extruder decreases, the shear force and mixing effect are reduced, the product quality is unstable, and even the screw and barrel are stuck. This problem is mainly caused by the wear of high-hardness modifiers (such as glass fiber, serat karbon) on the screw and barrel during the processing of reinforced engineering plastics.
Penyebab: 1. The screw and barrel are made of materials with poor wear resistance, which cannot resist the wear of high-hardness modifiers; 2. The filling amount of the modifier is too high (≥50%), and the wear is intensified; 3. The particle size of the modifier is too large, which increases the wear on the screw and barrel; 4. The extrusion pressure is too high, which increases the friction between the material and the screw and barrel; 5. The screw and barrel are not maintained regularly, and the material residue accelerates the wear.
Solusi: 1. Select extruders with high wear resistance, such as HTS PLUS series and HTS SUPER series. Their screws and barrels are made of imported wear-resistant alloy steel and undergo bimetallic composite treatment or laser cladding treatment, with surface hardness ≥65 HRC (HTS PLUS) dan ≥70 HRC (HTS SUPER), which can effectively resist the wear of high-hardness modifiers; 2. Control the filling amount of the modifier within a reasonable range. If high filling amount is required, select the HTS SUPER series extruders with better wear resistance; 3. Crush and sieve the modifier to reduce its particle size and reduce wear; 4. Adjust the extrusion parameters to control the extrusion pressure within the optimal range (5-15MPa), avoid excessive pressure; 5. Regularly maintain the screw and barrel, clean the material residue in time, and apply lubricating oil appropriately to reduce friction and extend the service life. Selain itu, our professional technical team can provide regular wear detection services for the screw and barrel, and put forward targeted replacement and maintenance suggestions.
5.4 Masalah 4: Unstable Product Size and Dimensional Deformation
Symptoms: The size of the extruded product (such as granules, pipa, lembaran) is uneven, the shrinkage rate exceeds the standard (＞1.5%), and the product has deformation, warpage and other phenomena, which affects the assembly and use of the product.
Penyebab: 1. The extrusion temperature is unstable, resulting in uneven melting and plasticization of the material, and uneven shrinkage during cooling; 2. The extrusion speed is unstable, leading to uneven extrusion amount and unstable product size; 3. The cooling speed is uneven, resulting in uneven internal and external stress of the product, leading to deformation; 4. The die head structure is unreasonable, the flow channel is not smooth, and the material flow is uneven; 5. The raw materials have high water absorption, and the moisture causes uneven shrinkage during processing.
Solusi: 1. Use the precise temperature control system of the HTS series extruders to ensure the stability of the extrusion temperature, and avoid temperature fluctuation; 2. Adjust the feeding speed and screw speed to ensure the stability of the extrusion speed, and use the frequency conversion speed regulation function of the HTS series extruders to realize the synchronous adjustment of feeding and extrusion; 3. Optimize the cooling process, ensure uniform cooling speed, adjust the cooling water temperature (20-30℃) and cooling time (2-5 menit) for strip cooling, and use air cooling or water spray cooling for pipes and sheets to avoid uneven cooling; 4. Check and optimize the die head structure, ensure the smooth flow channel, and adjust the die head temperature to ensure uniform material flow; 5. Strengthen the drying treatment of raw materials, strictly control the moisture content, and reduce the impact of moisture on product shrinkage.
5.5 Masalah 5: Low Extrusion Efficiency and High Energy Consumption
Symptoms: The production capacity of the extruder is lower than the design standard, the energy consumption per unit product is high, and the production cost is increased, which affects the economic benefits of the enterprise.
Penyebab: 1. The screw speed is too low, the conveying capacity is insufficient; 2. The extrusion temperature is too low, the material viscosity is too high, the conveying resistance is increased, and the production capacity is reduced; 3. The combination of screw elements is unreasonable, the conveying efficiency is low; 4. The feeding device is blocked or the feeding speed is insufficient, resulting in insufficient feeding; 5. The screw and barrel are worn, the conveying capacity is reduced, and the energy consumption is increased.
Solusi: 1. Increase the screw speed appropriately (within the range suitable for the material) to improve the conveying capacity and production efficiency. The HTS series extruders can reach a maximum speed of 1000rpm, which can significantly improve production efficiency; 2. Properly increase the extrusion temperature to reduce the material viscosity, reduce the conveying resistance, and improve the conveying efficiency; 3. Adjust the combination of screw elements, increase the number of conveying elements, optimize the screw lead and compression ratio, and improve the conveying efficiency. The modular screw design of the HTS series extruders can realize the quick adjustment of screw elements; 4. Check and clean the feeding device regularly, ensure the smooth feeding, and adjust the feeding speed to match the screw speed, avoid insufficient feeding; 5. Regularly detect the wear degree of the screw and barrel, replace the worn components in time, and maintain the conveying capacity of the extruder, reducing energy consumption. Selain itu, the HTS series extruders adopt an optimized structural design and high-efficiency motor, which can reduce energy consumption by 15%-20% dibandingkan dengan ekstruder biasa.
6. Conclusion and Future Development Trend
Plastik rekayasa, sebagai bahan utama berkinerja tinggi, are playing an increasingly important role in global industrial upgrading, and twin-screw extrusion technology is the core support for the high-quality processing of engineering plastics. The performance of extrusion equipment directly determines the quality, efisiensi produksi dan efek penerapan produk plastik rekayasa. Our HTS series twin-screw extruders, termasuk HTS BASIC, HTS PLUS and HTS SUPER, are specially designed for the processing characteristics of engineering plastics (sensitivity to overheating and hydrolytic degradation, high requirements on mixing and dispersing effect, viskositas tinggi), with the advantages of high torque, kecepatan tinggi, kontrol suhu yang tepat, ketahanan aus yang sangat baik, wide application range and intelligent control. They can provide targeted processing solutions for different types of engineering plastics and different scales of enterprises, helping enterprises solve processing difficulties, improve product quality and production efficiency, and enhance market competitiveness.
Looking forward to the future, with the continuous upgrading of downstream industries such as automotive lightweight, kecerdasan listrik dan elektronik, new energy and medical high-endization, the demand for high-performance, functional and environmentally friendly engineering plastics will continue to grow, which will also put forward higher requirements on twin-screw extrusion technology and equipment. The future development trend of engineering plastics twin-screw extruders will be mainly reflected in four aspects:
Pertama, intelligence and digitalization. With the development of Industry 4.0, twin-screw extruders will be more integrated with intelligent technologies such as Internet of Things, big data and artificial intelligence. The HTS series extruders will further optimize the cloud control function, realize real-time monitoring, data analysis, predictive maintenance and intelligent adjustment of the entire production process, reduce labor intervention, and improve production efficiency and product consistency. Pada saat yang sama, digital simulation technology will be widely used in the design and debugging of extruders, reducing the research and development cycle and debugging time of equipment.
Kedua, high performance and high efficiency. The demand for high-end engineering plastics (seperti MENGINTIP, PI) will continue to increase, which will promote the continuous upgrading of extruder performance. The future extruders will have higher torque, higher speed and more precise temperature control capacity, and the key components (baut, barel, kotak roda gigi) will be further optimized to improve wear resistance, corrosion resistance and service life. Pada saat yang sama, the energy consumption of the equipment will be further reduced, realizing high-efficiency and energy-saving production.
Ketiga, customization and diversification. Different application fields and different products have increasingly personalized requirements for extrusion processing. The future extruders will adopt a more flexible modular design, which can quickly replace screw elements, die heads and other components according to customer needs, realizing the processing of multiple varieties and small batches. Pada saat yang sama, we will provide more personalized customized solutions according to the special processing needs of customers, meeting the diverse market demands.
Keempat, environmental protection and greenization. With the strengthening of global environmental protection policies, environmental protection will become an important development direction of extrusion equipment. The future extruders will adopt more environmentally friendly materials and manufacturing processes, reduce energy consumption and pollutant emissions; pada saat yang sama, they will be more compatible with recyclable engineering plastics and biodegradable engineering plastics, promoting the green development of the engineering plastics industry.
We will always adhere to the concept of technological innovation, focus on the development needs of the engineering plastics industry, continuously invest in research and development, optimize the performance of HTS series extruders, improve after-sales service, and provide more professional, efficient and intelligent twin-screw extrusion solutions for global engineering plastics processing enterprises, helping the high-quality development of the engineering plastics industry.