Poly (ethylene terephthalate) (PET) is a kind of film material made from polyethylene terephthalate. At the same time, is a kind of polymer plastic film, because of its excellent comprehensive performance and more and more favored by the majority of consumers. Due to the current production and technical level can not meet the demand of the market, some still rely on imports.

It is a colorless and transparent film, gloss, excellent mechanical performance, rigidity, hardness and high toughness, puncture resistance, friction resistance, high temperature resistance and low temperature resistance, chemical resistance, oil resistance, air tightness and fragrance is good, is one of the commonly used barrier composite film substrate. But the price of polyester film is high, the general thickness is 12µ m, commonly used as cooking and packaging of the outer layer material, printability is better. Due to the complexity and difficulty of the polyester film, it brings many difficulties to the customs supervision.