The process of self-adhesive film without glue is divided into two types: one is for extrusion casting machine production, and the other is for extrusion blown film production machine. The ingredients of the two processes are different, and the quality and price of the products are different. It is not judged here which process is better, but the electrostatic components of the lower-cost electrostatic film will be transferred on the surface of the product, affecting the quality of the product. Therefore, blindly pursuing low prices does not bring good results. The market is fair, expensive things are not necessarily good, but good things must be expensive.