The scope of application of low-density polyethylene: suitable for food packaging such as seasonings, cakes, sugar, candied fruit,biscuits, milk powder, tea, fish floss, etc. Packaging of medicines such as tablets and powders, and packaging of fiber products such as shirts, clothing, knitted cotton products and chemical fiber products. Daily chemical products packaging such as washing powder, detergent and cosmetics. Due to the poor mechanical properties of the single-layer PE film, it is usually used as the inner layer of the composite packaging bag, that is, the heat-sealable substrate of the multilayer composite film.