Recycling process of waste plastic film

There are various types of waste plastics and different forms. Many recycling methods have been created in practice. Here are some examples for reference.

Recycling of PP PE washing machine factory

Film is one of the largest 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.

(1) Agricultural film. The agricultural film mainly includes mulch film and greenhouse 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. The film is generally dirty, and often contains soil, sand, grass roots, iron nails, iron wires, etc., iron impurities should be removed and cleaned. The main recycling method is granulation. If there is manual sorting and cleaning conditions, After cleaning and drying, the waste film can be directly used to produce plastic products, such as basins, barrels, and plastic flanges, by hot extrusion.

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, can also be used to make fertilizer packaging bags, garbage bags, agricultural recycled water pipes, fences, tree supports, pots, barrels, garbage bins, geotechnical materials, etc.

2. PVC recycled pellets, PVC recycled pellets can be used to produce packaging films such as heavy packaging bags, agricultural water pipes, shoe soles, and other packaging films. The packaging film materials 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: multilayer plastic composite film, multilayer plastic composite film including PE/PP, PE /EVA/PE, PE/adhesive/PA/adhesive/PE, PP/PVDC, etc. Before recycling, different materials must be separated first. Solvent separation 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.

Aluminum-plastic composite film, aluminum-plastic composite film such as BOPP/aluminum, PE/aluminum, etc., are used for various food packaging. The used aluminum-plastic composite flexible packaging bag is actually a kind of mixed waste, which is difficult to recycle. The treatment method abroad is mainly incineration and heat recovery. In China, there are methods of burning aluminum and pulverizing and adding fillers to make low-grade crude products, but the effect is not satisfactory. 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-crushing-sieving-pellets-aluminum powder-additives-extrusion-semi-finished products-extrusion-finished products . The aluminum-plastic composite waste is cleaned, crushed and sieved through a 10-day sieve, and then pelletized. This process can use the pelletizer of Beijing Plastic Machinery Factory. The pellet process conditions are water spray: 0.8 liters of 95°C water, feeding time: 3 min, pumping time 5 min, crushing time 10 min, and 15 kg each time. The pelletized material is extruded by an extruder to become a semi-finished product. This semi-finished product is then added with 20% aluminum powder, flame retardant, compatibilizer and other additives, and then extruded to be pelletized to obtain the product. As a conductive material.