Poly(ethylene terephthalate) (PET) is a kind of crystalline polymer. In traditional, PET film can get only 30% shrinkage ratio via a special processing. A modification of PET film can reach higher shrinkage. Amorphous poly(ethylene terephthalate) (A-PET) is a copolymer, which was synthesized by adding a diacidic component(the third component) in copolymerization reaction. The third component can change the regular structure of polymer, reduce the inter- and intra- molecular interaction, that can destroy the crystalline of poly(ethylene terephthalate). The film with high shrinkage ratio can be fabricated by using this material. A-PET shrinkage film is prepared by the following steps: A-PET was dried then compounded by an extruder, then molded via a casting die. The film was mono– or bi- axially stretched at a proper temperature (above glass transition temperature), then cooled to freeze the molecular structure , then “memorized”. When the film was heated to the stretching temperature, the memorized macromolecule was relaxation then the film shrink. The amorphous region of PET contribute the shrinkage ratio a lot , that is why we need A–PET to manufacturing the heat shrinkage film. Targets of A-PET shrinkage film: 1. A-PET is amorphous polymer since the modified A-PET copolymer has no crystalline pick in DSC analysis.The technology of synergistic effect of fire retardants. 2. The tensile strength of A-PET film is above MD：7000psi, TD：20000psi ; and the tensile elongation is above MD：20%, TD：30% , according to ASTM D-882 method. 3. The tear strength of A-PET film is MD：0.2kgf，TD：0.3kgf according to ASTM D-882 method. According to ASTM D-1003 method, the haze and gloss of A-PET film are below 10% and above 100%, respectively. PVC shrink film is a major material in present packing market, especially in the bottle labels, batteries, capacitors, and 3C products. PVC shrink film is very difficult to recycle. In this plan, we try to use the amorphous A-PET shrink film to replace the high cost PETG shrink film. This can not only fit the market requirements, also has the low cost advantage. This innovation technology also let the PVC entrepreneur , printing entrepreneur and the packing processing entrepreneur achieved a low cost, high feasible technical promotion benefit, without replacing the existing original production equipments , in processing and the manufacturing the environmental friendly shrink films. This project contributes a lot of efforts for the environmental protection.

copolyester, amorphous poly (ethylene terephthalate) shrinkage film, heat shrinkage film