The full name of PET is polyphenylene dimethyl-acid glycolester. Product after stretching features favorable rigidity, high-temperature resistance, high stretching intensity, small scale factor and so on. It is applicable to areas involving run machine, packing belt, conveyer belt for various purposes and triangle belt etc. This product line takes Haiyu Machinery Co. nearly three years to lead its research to success. This is the first one in China and unreported internationally, meanwhile, this pioneering product line paved new ways for the development and application of PET.