Polyester chemical fiber is mainly polyester staple fiber, which is mainly used for blending with cotton, wool viscose fiber, linen and other chemical fibers to manufacture various clothing textiles. However, in recent years, the development of polyester filament yarns has been rapid. It is mainly processed into various textured yarns, such as polyester low-stretch yarns, polyester network yarns, etc., for weaving woven fabrics and knitted fabrics, and can be used as outerwear and underwear. In addition, polyester filaments are used in industry to manufacture tire cords, electrical insulation materials, ropes, and the like. In order to overcome the shortcomings of low moisture absorption and poor dyeability of polyester, high moisture absorption polyester, anti-pilling polyester and cationic dyeable polyester have been produced through modification of polyester.
Strong elongation and elasticity Polyester has high strength, high elongation, and good elastic recovery performance. The strength of ordinary polyester is 35.2-52.8cN/tex, and the elongation at break is 30%-40%. According to different processing, polyester has high strength and low elongation, low strength and high elongation and other types. Due to its high strength, high elongation and good elasticity, polyester has excellent abrasion resistance, second only to nylon. In addition, the initial modulus of polyester is high, so the fabric is crisp and dimensional stability is good.
Nowadays, the cross-section of polyester staple fiber is not only circular, but made into a grooved cross-section, which can increase elasticity and air permeability. It is called "special fiber". It can even be mixed with other chemical fibers to spin a single fiber. There are two or several kinds of materials in the fiber, which can make them complement each other, called "sea-island fiber" (most of polyester is used to improve strength).
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