Films made of polyvinyl chloride, polyethylene, polypropylene, polystyrene and other resins are used for packaging and as a laminate layer. Plastic packaging and plastic packaging products are taking up more and more shares in the market, especially composite plastic flexible packaging, which has been widely used in food, medicine, chemical and other fields, and food packaging has the largest proportion, such as beverage packaging , Quick-frozen food packaging, steamed food packaging, fast food packaging, etc., these products have brought great convenience to people's lives.
