The materials of packaging film include cellophane, PE, PVC, PP, EVA, PVDC, PA, PET and various composite films. A single-layer packaging film of one material, after sorting and cleaning, can be directly made into plastic products like agricultural films or made into various products after granulation. Composite films include composite films of different plastics and films made of plastic and paper, aluminum foil, and other materials. The recycling treatment after recycling is more complicated , such as multi-layer plastic composite films: Multi-layer plastic composite films include PE/PP, PE /EVA/PE, PE/adhesive/PA/adhesive/PE, PP/PVDC, etc. Before recycling, different materials should be separated first. Separation can be done by solvent separation. The paper-plastic composite film needs to be separated from the paper and plastic before recycling. This is also the method of paper-plastic composite separation. The separation equipment is a chrome-plated hollow barrel with electric heating. The barrel and the hollow cylinder rotate in opposite directions, the crushed paper-plastic mixture is added to the barrel, the plastic on the heated mixture in the barrel is melted and discharged from the lower part of the barrel, and the air in the hollow cylinder takes the waste gas away. Aluminum-plastic composite films include BOPP/aluminum, PE/aluminum, etc., which are used for various food packaging. The used aluminum-plastic composite flexible packaging bag is actually a mixed waste, and it is difficult to recycle. The main treatment method abroad is incineration to recover heat. In China, there is a method of incinerating aluminum and smashing and adding fillers to make low-grade crude products, but the effect is not ideal. Here is an example of using the conductivity of aluminum to manufacture antistatic functional materials. The process is as follows: aluminum-plastic composite waste—cleaning—pulverizing—sieving—agglomerate—aluminum powder— auxiliaries—extrusion—semi-finished products—extrusion—finished products The aluminum-plastic composite waste is cleaned, crushed, screened for 10 days, and then pelletized. The agglomerated material is extruded by an extruder to form a semi-finished product. The semi-finished product is then added with 20% aluminum powder, flame retardant, compatibilizer and other additives, and then the product can be obtained by extrusion and selection of granules. as conductive material.
