The most widely used aluminized films are mainly polyester aluminized film (VMPET) and CPP aluminized film (VMCPP). The aluminized film has both the properties of a plastic film and the properties of a metal. The surface of the film is coated with aluminum to prevent light and ultraviolet radiation, which not only prolongs the shelf life of the content, but also increases the brightness of the film. It replaces the aluminum foil to a certain extent, and has the advantages of low cost, good appearance and good barrier property. Aluminized film is widely used in composite packaging.