The sheet material for blister packaging is called hard film or film, commonly used are: pet (polyethylene terephthalate) hard film, PVC (polyvinyl chloride) hard film, PS (polystyrene) hard film. PS hard disk has low density, poor toughness and is easy to burn. When it is burned, styrene gas (harmful gas) will be produced, so it is generally used to produce various industrial plastic pallet.
PVC hard disk has moderate toughness and is not easy to burn. When it burns, it will produce chlorine gas, which will have a certain impact on the environment. PVC is easy to heat close. It can be sealed by sealing machine and high-frequency machine. It is the main raw material for the production of transparent Blister products.
Pet hard disk has good toughness, high transparency, easy to burn, and does not produce harmful gases when burning. It belongs to environmental protection materials, but its price is high, so it is suitable for making high-grade Blister products. Generally, pet hard disk is required for blister shell in European and American countries, but it is not easy to heat up, which brings great difficulties to packaging. In order to solve this problem, people compound a layer of PVC film on the surface of pet, named PETG hard disk, But the price is higher