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Polyester fiber is a kind of high-quality synthetic fiber. The suture produced by it has high strength, second only to nylon thread among all kinds of sutures, and it will not reduce the strength when wet. Its shrinkage rate is very small, and the shrinkage is less than 1% after proper shaping, so the stitches sewn can always remain flat and beautiful without shrinkage. The abrasion resistance is second only to nylon. Low moisture regain, good high temperature resistance, low temperature resistance, light resistance and water resistance. Therefore, polyester thread is an extremely widely used variety, which has replaced cotton sewing thread on many occasions. Polyester thread has a wide range of uses. It can be used to sew cotton fabrics, chemical fiber fabrics and blended fabrics, and can also be used to sew knitted outerwear. Special polyester thread is also an excellent thread for the shoe and hat leather industry