What are the common plastic sheets and characteristics of blister packaging?

The sheets used for blister packaging are called hard sheets or films, and commonly used are: PET (polyethylene terephthalate) hard sheets, PVC (polyvinyl chloride) hard sheets and hard sheets. PS hard sheet has low density, poor toughness and is easy to burn. Styrene gas (a harmful gas) will be produced 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. Chlorine gas will be produced during combustion, which has a certain impact on the environment. PVC is easy to heat seal, and can be sealed by sealing machine and high frequency machine. It is the main raw material for producing transparent plastic products. PET hard sheet has good toughness, high transparency and easy combustion. No harmful gas will be produced when burning. It is an environmentally friendly material, but it is expensive and suitable for making high-grade plastic products. Plastic blister shells in Europe and America generally require the use of PET hard sheets, 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, which is named PETG hard sheet, but the price is higher.