The sheet used for blister packaging is called hard sheet or film. Commonly used are PET (polyethylene terephthalate) hard sheets, PVC (polyvinyl chloride) hard sheets, and PS (polystyrene) hard sheets. PS hard film has low density, poor toughness, and is easy to burn. When it is burned, it will produce styrene gas (which is a harmful gas), so it is generally used to produce various industrial plastic trays.
PVC hard sheet has moderate toughness, is not easy to burn, will produce chlorine when it is burned, and will have some impact on the environment. PVC is easy to heat and can be sealed by a sealing machine and high-frequency machine. It is the main raw material for producing transparent plastic products.
PET hard film has good toughness, high transparency, easy to burn, no harmful gas when burning, and belongs to environmental protection material, but its price is high and it is suitable for high-grade plastic products
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