Twin Screw Extruder For Recycled Plastic

This series of equipment is designed specifically for the harsh working conditions of recycling plastic mixing and recycling plastic granulation. Nanjing Kelongwell Chemical Machinery Co., Ltd. relies on advanced co directional parallel twin screw extruder technology to convert post consumer and industrial waste into high-quality particles. The equipment is positioned in the recycling plastic processing stage that requires efficient volatilization, mild thermal history, and excellent dispersibility, helping customers upgrade low value recycled materials into stable high-grade raw materials that can be directly used for injection molding or extrusion.

·High free volume screw configuration: optimizes the depth and lead of the screw groove, adapts to the recycling of low packing density materials such as plastic sheets and film scraps, reduces shear heat, and avoids the degradation of thermosensitive polymers.
·Multi stage forced devolatilization system: equipped with large-diameter natural exhaust ports and multi-stage vacuum exhaust sections, it efficiently removes moisture, oligomers, and volatile organic compounds (VOCs), significantly improving the cleanliness of plastic granulation.
·High wear resistant hard surface treatment: The inner lining of the barrel is made of nickel based alloy bimetallic, and the threaded components are made of tungsten carbide alloy or powder metallurgy material, which can withstand the abrasion of glass fiber, talcum powder, and trace metal impurities on the equipment.
·Accurate segmented temperature control: Each section of the barrel is independently heated/cooled to achieve precise control of the temperature of the recycled plastic melt, avoiding carbonization or viscosity fluctuations caused by the complex thermal history of the material.

Noted: Details depend on your requirements and need.

Unlike conventional twin screw extruders used for new material modification, this series of products demonstrates unique advantages in the recycling of plastic pellets. Traditional single screw extruders are difficult to adapt to the irregular sheet shape and bulk density fluctuations of recycled plastics, while our co rotating twin screw extruder can achieve uniform plasticization and distribution mixing of high filling systems through modular threaded component combinations. At the same time, the equipment has strengthened the devolatilization volume and vacuum system to address the common high moisture and high volatile characteristics of recycled plastic pellets, enabling the full removal of bubbles and odor components from the recycled plastic melt. Compared to similar models, it has lower energy consumption, stronger tolerance for impurities, and can flexibly switch between different recycled materials (such as PE/PP/PS/PET, etc.) on the same device without the need for frequent replacement of key components.

·Recycled plastic from household sources (PCR): HDPE, PP, PET bottle flakes are directly granulated after cleaning and used for packaging, pipes, and daily necessities.
·Automotive Disassembly Material (ASR): Recycled engineering plastics (PA, ABS, PC) for purification and reinforcement, used for non critical structural components.
·Industrial waste recycling: homogenization granulation of recycled plastics such as film scraps, fiber waste, injection nozzle materials, etc.
·Electronic waste recycling: separation and modification of battery separators and plastic shells.
·Wood plastic composites (WPC): Using recycled plastics as substrates, produce outdoor flooring, fences, etc.

Nanjing Kelongwell Chemical Machinery Co., Ltd. provides OEM/ODM overall solutions for the characteristics of recycled materials:
·Customized screw combination: Based on the impurity content, bulk density, and volatile matter indicators of recycled plastics, design targeted threaded component arrangements to achieve optimal volatilization and melting effects.
·Specialized feeding system: For low bulk density recycled materials (film fragments, fibers, sheets), it is equipped with a forced side feeder or a conical twin screw feeder to ensure stable feeding.
·Downstream granulation unit: Based on the characteristics of recycled plastic granulation, customized water ring granulation, underwater granulation, or strip granulation systems are designed to match different material viscosities and production capacities.
·Control system: PLC fully automatic control, integrated energy consumption monitoring and data traceability, meeting the production stability and environmental management needs of recycling factories.

Q1: Compared to conventional extruders, what are the specific advantages of your twin screw extruder in handling recycled plastics?
A: Conventional extruders (especially single screw extruders) have poor tolerance for the shape, moisture fluctuations, and impurities of recycled plastics. Our twin screw extruder adopts a high free volume screw groove and multi-stage exhaust structure for the granulation of recycled plastics. Even if the feed contains a small amount of lightweight debris or moisture, it can ensure stable melting and volatilization, and the uniformity of the melt is much better than that of ordinary models.

Q2: It is inevitable that there will be metal debris or abrasive substances such as glass fibers in the recycled materials. How to ensure the service life of the equipment?
A: Nanjing Kelongwell Chemical Machinery Co., Ltd. has strengthened the selection of equipment for recycling plastic granulation conditions. The barrel is lined with bimetallic alloy (nickel chromium+tungsten carbide), and the threaded components are made of powder metallurgy high wear-resistant materials. For high filling return materials, a fully hardened barrel and wear-resistant threaded components can also be selected, greatly extending the service life of the twin screw extruder.

Q3: If the moisture content of recycled plastic is high, is it necessary to dry it in advance?
A: The design of this series of twin screw extruders has fully considered the issue of moisture in recycled plastics. Through multi-stage exhaust and efficient vacuum devolatilization system in the aspect ratio configuration, moisture and low molecular weight volatiles can be forcibly extracted during the melting process. For most recycling plastic granulation applications, the independent pre drying process can be eliminated, simplifying the process and reducing energy consumption.

Q4: What is the maximum amount of filler or additive that can be added during the process of recycling plastic pellets?
A: Due to its high torque twin screw extruder, this device has strong dispersion and mixing capabilities. According to the different matrix resins, the proportion of mineral fillers (calcium carbonate, talc powder, etc.) added to recycled plastics can reach 70-80%. However, considering the mechanical properties of the final product, we usually recommend combining the original properties of the specific recycled material and optimizing the screw combination to control the filler within the range of 30-50%, in order to obtain a particle product with a balance between rigidity and toughness.

Q5: How to ensure the stability of production and quality when there is significant fluctuation in the incoming plastic materials for recycling?
A: The difference between batches of recycled plastics is a processing difficulty. Our twin screw extruder is equipped with a modular screw design and an intelligent PLC control system. When the incoming material density or viscosity changes, the system can adjust the feeding speed and screw speed in real time based on the main motor torque, ensuring stable filling of the screw groove and maintaining consistent production capacity and melt quality of the returned plastic pellets, avoiding uneven appearance or performance of the pellets caused by material fluctuations.