Plastic waste can be divided into the following categories according to different reuse methods:
1. Recycled plastics: This type of plastic can be processed into products with the same or similar properties as new materials through conventional processing methods. They can be reused to make various plastic products such as packaging materials, construction materials, etc.
2. Reprocessed plastics: This type of plastic is also made from waste plastics, but their performance is slightly worse than that of recycled plastics, but they can still meet certain usage requirements. Reprocessed plastics are usually used to make products that do not require high performance, such as plastic flower pots, plastic chairs, etc.
3. Recycled plastic: This type of plastic is recycled through chemical or physical methods and then used again to make new plastic products. Recycling plastics usually involves crushing, cleaning, smelting and other processing of waste plastics, and then adding new polymer monomers for re-polymerization.
4. Reusable plastic: This type of plastic can be reused many times to reduce environmental pollution. For example, some food packaging materials such as plastic bottles, plastic bags, etc. can be reused after cleaning.
5. Recyclable plastics: This type of plastic can be recycled and reused through certain processing methods. For example, some high-molecular-weight plastics such as polyethylene and polypropylene can be broken down chemically and reused to make new plastic products.
6. Non-recyclable plastics: This type of plastic refers to plastics that cannot be recycled and reused through existing technical means. For example, some contaminated plastics or difficult-to-degrade plastic materials are difficult to decompose in the natural environment and are not suitable for use in making new plastic products.
The resource recycling process usually includes the following steps:
1. Cleaning: Clean waste plastics to remove oil, impurities and other pollutants.
2. Shredding: Shred waste plastic into small pieces or particles to facilitate subsequent handling and processing.
3. Crushing: Crushing waste plastic into smaller particles or powder for easy smelting and processing.
4. Pulverizing: Mill the crushed waste plastic to obtain finer powder for subsequent processing and treatment.
5. Mixing: Mix the ground waste plastic with new polymer monomers or other additives to facilitate polymerization and processing.
6. Extrusion: The mixed waste plastic is extruded to make plastic products of various shapes.
7. Blow molding: The extruded waste plastic is blow molded to make plastic products of various shapes and sizes.
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