The sheet used for blister packaging is called rigid sheet or film, commonly used are: PET (polyethylene terephthalate) rigid sheet, PVC (polyvinyl chloride) rigid sheet, PS (polystyrene) rigid sheet. PS hard sheet has low density, poor toughness, easy to burn, and produces styrene gas (a harmful gas) when burning, so it is generally used to produce various industrial plastic trays. PVC hard sheet has moderate toughness and is not easy to burn. When burning, chlorine gas will be produced, which will have a certain impact on the environment. PVC is easy to be heat-sealed, and can be edge-sealed by sealing machine and high-frequency machine. It is the main raw material for the production of transparent plastic products. PET hard sheet has good toughness, high transparency, easy to burn, and does not produce harmful gas when burning. It is an environmentally friendly material, but the price is high, and it is suitable for high-end blister products. It is not easy to heat seal, which brings great difficulties to packaging. In order to solve this problem, people use a material called PETG ethylene glycol modified-polyethylene terephthalate, which has both the ease of PVC. Heat sealing, also has the high environmental protection and transparency of PET, but the price is higher.
FROM:yongyixisu