Recycling technology of PVC film rolls
At present, there are three main technologies used to recover PVC: one is physical recycling; the second is comprehensive utilization of chemical recycling; the third is recycling and using energy by burning PVC materials. Among them, the comprehensive utilization of physical method and chemical method is worthy of respect. They can recycle waste products and give full play to the usability of materials.
Physical recovery method
Physical recycling means that the recycling process of PVC waste is only mechanically processed, mainly through shredding, screening, grinding and other procedures, ultimately obtaining film, powder, granules or other forms of recycled materials. These recycled materials can be used to produce heavy packaging bags, agricultural water pipes and shoe soles.
PVC plastic products are divided into soft products and hard products. Soft products mainly include films, cable sheaths, plastic shoes and leather products; hard products mainly include bottles, pipes, profiles, plates and sheets.
Among soft products, agricultural films are the most used category. Agricultural films are made of PVC, PE, EVA and other materials. When recycling, the PVC film should be distinguished from other material films. Agricultural film often contains soil, sand, gravel, grass roots and iron nails. These impurities must be removed and cleaned, and then dried and shredded into fragments or pellets, and then made into agricultural product packaging film and agricultural regeneration Water pipes and shoe soles, etc. As the recycled waste agricultural PVC film is heated and processed many times and mechanically, it will inevitably be partially degraded and its strength will decrease accordingly. In order to ensure the quality of the product, some new PVC resin and corresponding additives need to be added. If the recycled material is to be made into a secondary plastic film through banburying, two-roll, four-roller winding, etc., and different colors are added during the banburying process, the calendered film produced will show different colors. In addition, about 30% of the plasticizer (mainly DOP) remaining in the waste agricultural PVC film can be recycled and can be reused after refining.
pvc film roll