Polyester thin film(PET) is a thin film material made of polyethylene terephthalate as a raw material, which is made of thick films by extrusion method and then made by two-way stretching. Polyester film environmental protection film PET film emulsion film and other printed packaging consumables, widely used in the glass and steel industry, building materials industry, printing industry, medical health. Polyester film also known as polyester film polyester film photosensitive paper polylipid film benzene tin film glass paper off the film.