KYmach twin-screw extruders efficiently recycle PP, PE, PET, and engineering plastics, producing high-quality pellets while enhancing material properties and reducing environmental impact.
Overview of Recycled Plastics
With global carbon reduction initiatives, recycled plastics have become an essential part of the circular economy. Using recovered plastics reduces CO₂ emissions, lowers pollutant discharge, and supports carbon peak and carbon neutrality goals.
Twin-screw extruders play a central role in recycling processes. They not only convert irregular recycled plastics into uniform pellets, but also enhance material properties. They can also facilitate chemical depolymerization (hydrolysis, alcoholysis, etc.) to recover monomers for further use.
Applications:
1. Engineering Plastics Recycling
- Household appliances and automotive plastics can be processed via single-screw extruder with dual-plate filtration and twin-screw extruder with continuous filtration.
- Additives can be incorporated in the twin-screw section to improve pellet quality or performance.
2. Polyolefin Recycling (PP & PE)
- Buckets, bottles, and containers are shredded, filtered, and pelletized.
- Twin-screw extruder enables performance modification and quality enhancement during recycling.
3. PET Recycling (Beverage Bottles)
- Cleaned PET flakes are homogenized and fed into the twin-screw extruder.
- Multi-stage vacuum degassing removes moisture rapidly, producing low-viscosity, high-quality PET pellets or sheets.
- The process accommodates 100% recycled content for APET, PETG, and high-temperature CPET.
Process solution-Process Flow
| Stage | Process Description | Equipment / Function |
| Feeding | PET flakes or shredded plastics | Metered feeding, large feed port for stable intake |
| Compounding & Extrusion | Twin-screw melting, mixing, homogenization | Multi-stage vacuum degassing (coarse + high vacuum) |
| Additives | Material performance enhancement | Booster pump, controlled dosing |
| Filtration & Screening | Remove contaminants and enable uniformity | Single-screw filtration, screen changers |
| Pelletizing / Sheet Winding | Form stable pellets or sheets | Underwater pelletizing, cooling, winding |
| Drying & Packaging | Prepare for storage and transport | Dehydration, vacuum packaging |
Process Flow Summary:
Material Feeding → Compounding & Extrusion → Filtration → Additive Dosing → Pelletizing/Sheet Winding → Drying & Packaging
Equipment options
| Model | HK96 | HK96 | HK73 |
| Screw diameter(mm) | 93.6 | 93.6 | 72.2 |
| Max. screw speed(rpm) | 600 | 400 | 400 |
| L/D | 40 | 40 | 40 |
| Motor power(kW) | 250 | 250 | 160 |
| Throughput(kg/h) | 1000-1500 | 800-1100 | 500-800 |
| Application | PS recycling | PET recycling | PET recycling |
Advantages of KYmach Recycled Plastic Solutions
- Continuous processing enables high efficiency and stable pellet quality
- Multi-stage vacuum degassing minimizes hydrolysis and preserves viscosity
- Advanced control systems allow rapid, stable operation with precise pressure and material feed control
- Compatible with a wide range of recycled materials, including engineering plastics, PP/PE, and PET
Customer Cases
(1) A Recycling Company has five production bases for renewable resources, with 10 sets of KY twin-screw extruders, including HK96 and HK73.
(2) A Shanghai Plastic Technology Co., Ltd. produces PET and PP packaging materials in Shanghai, Kunshan, and Malaysia, using 8 sets of KY twin-screw extruders, including HK96 and HK73.
