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and ethylene glycol polycondensate,and together referred to as PBTThermoplastic polyester,or polyester.1946 Britain issued the first patent for preparing PET,1949 British Formula ICI completed in the trial,but after the purchase of patents DuPont in 1953 to establish a production plant in the world,the first industrial production.Almost all the early PET for synthetic fibers(of known polyester,Dacron).Since the 1980s,PET as a breakthrough in the development of engineering plastics,have developed a nucleating agent and crystallization accelerator,currently together as PET and PBT thermoplastic polyester,has become one of the five engineering plastics.PET into fiber grade polyester chips and non-fiber grade polyester chips.①fiber grade polyester for the manufacture of polyester staple fiber and polyester filament yarn,polyester fiber raw material supply enterprises processing fiber and related products.As production of polyester fiber in the.