PTT fiber is the English abbreviation of polytrimethylene-tereph-thalate fiber. It was first produced by Shell Chemical (Shell Chemical Company) and DuPont Company of the United States respectively from the petroleum process. Route and bio-corn process route: New polyester fiber made by polymerization and spinning of PTA and PDO, PTT fiber and PET (polyethylene terephthalate) fiber, PBT (polybutylene terephthalate 1.4 ester) fibers are both polyester fibers. PTT fiber has the characteristics of polyester, nylon, and acrylic fiber. In addition to good anti-fouling properties, it is easy to dye, soft to the touch, and elastic. Its elongation is as good as spandex fiber. Compared with elastic fiber spandex, it is easier to process. It is very Suitable for textile and clothing fabrics; in addition, PTT also has the characteristics of dryness and crispness. Therefore, in the near future, PTT fiber will gradually replace polyester and nylon and become the large-scale fiber in the 21st century.