Recycled Plastics

Overview:

In the global trend towards the carbon reduction,recycled plastics play a crucial role in recycling and are gaining attention due to carbon peaking and carbon neutrality goals. Recycling and reusing resources is essential for reducing carbon emissions and pollutants, making it a key strategy for achieving carbon peaking and neutrality.

In the global carbon reduction trend, recycled plastics are getting more attention for helping us achieve carbon peaking and neutrality goals.

Co-rotating twin-screw extruders, essential for plastic compounding, also play an important role in recycling plastics. They not only transform irregular recycled plastics into uniform pellets but also enhance their properties and can even depolymerize them into desired chemical monomers.

Operation Scope：

Co-rotating twin-screw extruders have modular screw and barrel designs for recycling and pelletizing different resins. They excel in compounding, enhancing, or modifying properties. Their vacuum degassing feature is ideal for pelletizing hygroscopic resins.

Recycling of engineering plastics (used in home appliances and automobiles), a two-stage extruder system [single-screw (dual-plate filtration) + twin-screw (continuous filtration)] is employed. This system processes crushed flakes into pellets, and additives can be incorporated during the twin-screw stage to improve their quality or properties.

In the recycling of engineering plastics (used in appliances and automobiles), a two-stage extruder system [single-screw (dual-plate filtration) + twin-screw (continuous filtration)] is employed. This process crushes flakes into pellets, and incorporates the additives during the twin-screw stage to improve their quality or properties.

Polyolefins (containers, bottles) recycling: Similar to engineering plastics, this process involves using a single-screw (dual-plate filtration) + twin-screw (continuous filtration) system.

PET (beverage bottle) recycling: After being cleaned and dried, PET flakes are homogenized in a storage silo before being fed into a twin-screw extruder. Ultra-high vacuum units are used to remove moisture, producing low-viscosity PET pellets or sheets.

EPS recycling: After crushing and homogenizing, the material passes through a metal separator before entering a twin-screw extruder. In the extruder, the process involves melting, blending, extruding, and degassing. A high-efficiency filtration device removes impurities and leaves high-quality recycled pellets.

Technical Solutions：

PET recycling:

After homogenization, a single-screw feeder with an enlarged port feeds low-density PET flakes into the twin-screw extruder. The extruder has three vacuum degassing ports: the first uses a high-displacement, low-vacuum system, while the second and third use high vacuum, low displacement systems to minimize PET hydrolysis and viscosity reduction.

PET sheet:

Leveraging the twin-screw extruder's multi-vacuum exhaust design, the PET processing system operates without drying, reducing energy consumption. It adapts to various materials, including APET, low-temperature PETG, and high-temperature CPET, all with high plasticizing capability. The "one-key acceleration" feature enables low-speed adjustments and high-speed production, minimizing raw material waste. The advanced control system enables rapid data transmission, reducing errors and maintaining stability in speed, pressure, and material transport. With this system, the line speed can reach 1—80m/min.

Process Solution：

Parameters:

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.