Cup-making machine is called hard film or film, commonly used are: PET (polyethylene two ester) hard piece, PVC (PVC) Hard film, PS (polystyrene) hard film. PS Hard plate density low, poor toughness, easy to burn, combustion will produce styrene gas (is a harmful gas), so generally used to produce a variety of industrial cup machine with blister trays. PVC Hard Film toughness moderate, not easy to burn, combustion will produce chlorine, environmental impact, PVC Ige, can be used sealing machine and high-frequency machine edge, is the production of transparent blister products of the main raw materials. Pet hard film toughness, high transparency, easy to burn, combustion does not produce harmful gases, belong to environmental protection materials, but high price, suitable for high-end blister products, European and American Cup machine blister shell generally require the use of pet hard film, but it is not easy to heat, to the packaging brings great difficulties, in order to solve this problem, People in the pet surface composite layer of PVC film, named PETG hard piece, but the price is higher.