Film is one of the major types of plastic products. It has a wide variety of products and generally has a short service life. It is one of the main types of recycling.
Agricultural film: agricultural film mainly includes mulch film and shed film. The mulch film is mainly PE film. The shed mold includes PE, PE/EVA, and PVC film. When recycling, PE and PVC film should be distinguished. Agricultural film is generally better. Dirty, and often contain soil, sand, grass roots, iron nails, iron wires, etc., iron impurities should be removed and cleaned. The main method of recycling is granulation. If there are manual sorting and cleaning conditions, after cleaning, The dried waste film can be directly used for hot extrusion to produce plastic products, such as basins, barrels, plastic flanges, etc.
The uses of waste agricultural film recycled pellets are as follows: 1. PE recycled pellets: PE recycled pellets can be used to still produce agricultural film, and can also be used to make fertilizer packaging bags, garbage bags, agricultural recycled water pipes, fences, tree supports, pots, barrels , Trash cans, geotechnical materials, etc. 2. PVC recycled pellets: PVC recycled pellets can be used to produce heavy packaging bags, agricultural water pipes, shoe soles, etc.
Packaging film, the materials of the packaging film include cellophane (Siluolin), PE, PVC, PP, EVA, PVDC, PA, PET and various composite films. The single-layer packaging film of one material can be directly made into plastic products or granulated into various products after sorting and cleaning, just like agricultural films. Composite films include composite films of different plastics and films made of plastic and paper, aluminum foil, and other materials. The recycling process after recycling is more complicated, such as: Multi-layer plastic composite film: Multi-layer plastic composite film includes PE/PP, PE /EVA/PE, PE/adhesive/PA/adhesive/PE, PP/PVDC, etc. Before recycling, different materials must be separated first. Solvent separation method can be used for separation. Paper-plastic composite film, the paper-plastic composite film needs to be separated from 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 is equipped with a blade. The hollow cylinder of 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. The air in the hollow cylinder Take the exhaust gas away.
PET film: In the plastics industry, PET is mainly used for films and bottles, while the film can be used as packaging, decoration, tape base or capacitor insulation, PET film is also used as a photographic film base, PET is also used in large quantities for fibers, films and fibers The physical viscosity of PET is better than PET paper for bottles. Therefore, recycling is also slightly different. The scraps produced by PET film and fiber production plants can be used to wait for polyester/epoxy powder coatings. Generally, these scraps have a relative molecular mass of about 20,000 and a melting point of 260 degrees or more, which constitutes a single linear PET. Alcoholysis of such scraps with polyols at 250 to 260 degrees can obtain low-melting oligomeric polyesters with a relative molecular mass of about 2000 to 5000. The oligomerized polyester is polycondensed by adding dibasic anhydride and esterifying agent at 200 to 220 degrees, and the acid value is about 3.05 mgKOH/g, the softening point is about 85 to 105 degrees, and the glass transition temperature is less than or equal to 50 degrees. Used to make polyester/epoxy powder coatings. Polyester formulation for polyester/epoxy resin powder coating, raw material dosage, raw material dosage, PET scrap 723.6g dibasic anhydride 0.98mol dihydric alcohol 1.71mol catalyst 0.1%, PET industrial waste can also be used as a binder . Japan's Osaka Municipal Industrial Research Institute and Fuji Photo Film Company use PET industrial waste and glycerin to react to make adhesives for metal bonding. PET industrial waste is modified with adipic acid or ethylene glycol, and hot melt adhesives can also be prepared for bonding flexible materials such as cloth, leather, paper, plastics, and aluminum.
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