I. Steps in the Recovery and Processing of Waste Plastics
The recovery process of waste plastics is a complex and intricate procedure, mainly comprising steps such as collection, sorting, crushing, washing, drying, and pelletizing. Each step is crucial and collectively ensures the effective reuse of waste plastics. This process not only reduces environmental pollution but also conserves resources, contributing to sustainable development.
II. Processing Equipment and Procedures for Waste Plastics
Processing Equipment: Direct recycling and modified recycling of waste plastics primarily rely on equipment such as single-screw extruders, twin-screw extruders, and multi-stage pelletizing machines. These machines are designed to efficiently process waste plastics into reusable particles.
Extrusion and Pelletizing Procedures: Since waste plastics can easily retain a significant amount of moisture during the washing process, these moisture can form bubbles in the melt, affecting the quality of the pellets. Therefore, drying treatment is necessary before processing, with reasonable settings for drying temperature and time to ensure complete drying. This step is crucial for producing high-quality pellets.
III. The Importance of Drying and Filtering in the Recycling and Pelletizing of Waste Plastics
Drying Treatment: Since waste plastics can easily retain a significant amount of moisture during the washing process, these moisture can form bubbles in the melt, affecting the quality of the pellets. Therefore, drying treatment is necessary before processing, with reasonable settings for drying temperature and time to ensure complete drying. This step is crucial for producing high-quality pellets.
Filtering Treatment: Despite cleaning and separation, waste plastics may still contain impurities. Therefore, filtering treatment is required before the plastic melt is extruded to remove these impurities and ensure the high quality of the produced particles. Meanwhile, to ensure production continuity, a mechanical filter screen changing device is used to frequently replace the filter screen.
By following these steps and utilizing appropriate equipment, waste plastics can be effectively recycled and reused, contributing to a more sustainable and environmentally friendly world.
