pet film is a kind of packaging film with comprehensive performance. Its transparency is good, shiny; It has good air tightness and fragrance retention; Medium moisture resistance, moisture permeability rate decreases at low temperature. The mechanical properties of PET film are excellent, its strength and toughness is the best in all thermoplastics, tensile strength and impact strength is much higher than the general film; And good stiffness, size stability, suitable for printing, paper bags and other secondary processing. PET film also has excellent heat resistance, cold resistance and good chemical resistance and oil resistance. But it is not resistant to strong alkali; Easy to carry static electricity, there is no appropriate anti-static method, so in the packaging of powder items should pay attention to.