PET film is a relatively comprehensive packaging film. Its transparency is good, shiny; It has good air tightness and fragrance preservation. The moisture resistance is moderate, and the moisture permeability decreases at low temperature. The mechanical properties of PET film are excellent, its strength and toughness are the best of all thermoplastics, and the tensile strength and impact strength are much higher than the general film; And good strength, stable size, suitable for printing, paper bags and other secondary processing.