The Second Life of Plastics: How Recycling Usher in a New Green Chapter

Preface

Plastics bring great convenience to modern life, yet they have also become a major source of environmental pollution. Discarded plastic waste damages ecological systems and poses tangible risks to human health. Establishing an efficient waste plastic recycling and reuse system is a viable solution to this challenge. Such a system relies on core machinery including the Integrated Plastic Recycling Pelletizer. The green transformation of the industry also requires combined efforts from policy support, corporate innovation of environmental protection equipment, and public environmental awareness.

Current Status of Physical Recycling

Physical recycling is the mainstream approach for waste plastic treatment. It regenerates new raw materials through mechanical procedures such as crushing, washing, drying and melt pelletization. For example, waste PET bottles can be processed into polyester fibers for textiles. This technology features simple operation, low cost and zero secondary pollution.

In China, physical recycling mainly targets PET and polyethylene (PE). Specialized PS Foam Recycling Machine are adopted to process bottle flakes, while PE Foam Recycling Machine are used for lightweight regeneration of foaming packaging scraps. Statistics show that China’s annual recycling volume of PET accounts for only 9% of its total output, compared with 37% for PE, leaving huge room for improvement in foam plastic recycling.

Processes & Specific Technologies of Physical Recycling

Physical recycling remanufactures waste plastics into reusable raw materials via mechanical processing, consisting of crushing, washing, sorting and modification.

1. Preprocessing: Waste plastics are crushed, washed with detergent water to remove impurities, and sorted to raise the purity of recycled materials.
2. Modification & Pelletization: Materials are processed with matched equipment and compounded in mixers to enhance performance and expand application scope.

Three mainstream physical recycling technologies:

1. Melt Extrusion: Waste plastics are melted and extruded into fibers. Though partial performance loss occurs, the polyester fibers are widely used in apparel and home textiles.
2. Dissolution & Reprecipitation: Plastics are dissolved in specific solvents and reprecipitated to produce high-purity recycled resin with intact molecular structures, suitable for high-end manufacturing.
3. Treatment of Thermosetting Plastics: Non-meltable thermosetting plastics are crushed into fillers and blended to make composite materials for diversified finished goods.

Research proves that blends containing roughly 90% virgin resin and 10% recycled resin deliver nearly identical performance to all-new materials. Mechanical blending with modifiers further upgrades the properties and economic value of recycled plastics.