POLYESTER

1, the definition of polyester: polyester is an important variety of synthetic fibers, is the trade name of polyester fiber in China. It is refined terephthalic acid (PTA) or dimethyl terephthalate (DMT) and ethylene glycol (EG) as raw materials by esterification or ester exchange and polycondensation reaction and the production of fiber-forming polymers – polyethylene terephthalate (PET), by spinning and post-treatment of fibers.

2, polyester properties: high strength. Staple fiber strength of 2.6 ~ 5.7cN / dtex, high strength fibers for 5.6 ~ 8.0cN / dtex. due to low moisture absorption, it is basically the same wet strength and dry strength. Impact strength is 4 times higher than nylon and 20 times higher than viscose fiber.
Good elasticity. The elasticity is close to that of wool, and when elongated by 5% to 6%, it can recover almost completely. Wrinkle resistance exceeds that of other fibers, i.e., the fabric is not wrinkled and has good dimensional stability. The modulus of elasticity is 22～141cN/dtex, 2～3 times higher than nylon. Good water absorption.
Good abrasion resistance. Abrasion resistance is second only to nylon, which has the best abrasion resistance, and is better than other natural fibers and synthetic fibers. Good light resistance. Light resistance is second only to acrylic. Corrosion resistance. Resistant to bleach, oxidizers, hydrocarbons, ketones, petroleum products and inorganic acids. Resistant to dilute alkali, not afraid of mold, but hot alkali can make it decompose. Poor dyeability. Polyester imitation silk sense of strong, bright luster, but not soft enough, with the effect of flash, feel smooth, flat, good elasticity. Hand pinch the silk surface after loosening without obvious creases. The warp and weft are not easy to tear off when they are wet.
Polyester used to call it “indeed good”, after melt spinning to form POY after stretching, elasticization and other post-process formation of polyester silk. The most prominent feature is good shape retention, wearing polyester clothes are not wrinkled, look especially spiritual, healthy. It is washed, without ironing, as usual, flat and straight. Polyester has a wide range of uses, a variety of polyester-cotton, polyester wool, polyester silk and polyester viscose clothing and apparel on the market, are its products.

Polyester fabric moisture absorption is poor, wearing a stuffy feeling, while easy to carry static electricity, stained dust, affecting the beauty and comfort. However, it is extremely easy to dry after washing, and the wet strength almost does not decline, not deformed, and has good wash wearable performance.

Polyester is the best heat-resistant fabric in synthetic fabrics, melting point at 260 ℃, ironing temperature can be 180 ℃. With thermoplasticity, it can be made into pleated skirt with long-lasting pleats. At the same time, polyester fabrics have poor resistance to melting, and are prone to form holes when encountering soot, sparks and so on. Therefore, you should try to avoid contact with cigarette butts, sparks, etc. when wearing it.

Polyester fabrics have better light resistance, in addition to poorer than acrylic, its sun resistance is better than natural fiber fabrics. Especially in the glass behind the sun resistance is very good, almost with the acrylic is not the same. Polyester fabrics are good at resisting various chemicals. Acid, alkali on its degree of destruction are not large, while not afraid of mold, not afraid of insects. Polyester fabrics are very good at resisting wrinkles and retaining shape, and are therefore suitable for jacket garments.

Polyester varieties of broad categories: Polyester varieties of broad categories are staple fibers, tensile filaments, deformed filaments, decorative filaments, industrial filaments and a variety of differentiated fibers. Polyester staple fiber varieties: Distinguished by physical properties: high-strength low-extension type, medium-strength medium-extension type, low-strength medium-extension type, high-modulus type, high-strength high-modulus type Distinguished by the post-processing requirements: cotton, wool, hemp, silk type Distinguished by use: apparel, wadding, decorative, industrial Distinguished by function: cationic dyeing, moisture-absorbent, flame-retardant, tinted, anti-pilling, antistatic Distinguished by the cross-section of fibers: Shaped filament, hollow filament

Polyester filament varieties: 1. Primary filament: Undrawn filament (conventional spinning) (UDY), semi-pre-orientated filament (medium-speed spinning) (MOY), pre-orientated filament (high-speed spinning) (POY), highly oriented filament (ultra-high-speed spinning) (HOY) 2. Stretching filament: Stretching filament (low-speed stretching filament) (DY), full-stretching filament (spinning and stretching one-step) (FDY), full-take filament (spinning one-step) ( FOY) 3. FOY) 3. deformed yarn: conventional deformed yarn (DY), stretch deformed yarn (DTY), air deformed yarn (ATY)

3, polyester modification: polyester fiber fabrics are more varied, in addition to weaving pure polyester fabrics, there are many and a variety of textile fibers blended or interwoven products, to make up for the shortcomings of the pure polyester fabrics, to play a better taking performance. At present, polyester fabrics are moving towards the direction of imitation wool, silk, hemp, buckskin and other synthetic fibers naturalized.