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What are the uses of spandex and how is it different from polyester in Brazil?

November 14,2022

Spandex is a kind of elastic fiber, the scientific name is polyurethane fiber.

Spandex is a kind of elastic fiber, the scientific name is polyurethane fiber. It is highly elastic and can be stretched 6-7 times, but quickly returns to its original state as the tension is lost. Its molecular structure is a chain-like, soft, extendable polyurethane that is reinforced by its connection to a hard segment.

Spandex has excellent elasticity, elongation up to 450%~700%, and can be quickly restored to the original state after slack, like rubber band (rubber wire) is much better than rubber band, good fastness, strength is higher than rubber wire, soft comfort, has good chemical resistance, oil resistance, sweat resistance, no decay, no mildew, no yellow in the sun and other characteristics, The filament filament can be used for knitted goods, woven fabrics and other applications.

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Spandex is generally made of bare silk and nylon or other fibers

Spandex is generally made of bare silk and nylon or other fibers (cotton, wool, hemp, silk, chemical fiber, etc.) together into yarn, and processed and woven in warp knitting, weft knitting, weaving equipment. Because the stretch of spandex bare wire is large, the sliding performance is not good, so it is often used in the form of cladding yarn, Core yarn, ply yarn and so on. When the content of spandex in the yarn is less (2%~25%), the elastic function of spandex can be fully played.
The main uses of spandex are as follows: men's and women's clothing,Sportswear, swimsuit, tights, Flower socks (short, medium and high socks), gloves, etc. Elastic belt, automobile, aircraft and other seat belts, lace lace, etc.
Knee pads, wrist guards, elastic bandages, etc.
With the development and development of the domestic spandex market, the application field of spandex has been expanding, from the past knitting to knitting, from the past single clothing, expanded to clothing external use, packaging and other fields, and with the continuous improvement of people's living standards, the comfort of spandex products are more and more popular, the demand for spandex is increasing rapidly. Along with the economic development of our country, the class of export textile and clothing is continuously improving, spandex will certainly have broad development space.

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Similarities and differences between spandex and polyester

Polyester is higher in content than spandex. The main advantages of spandex are elasticity and non-aging, while polyester also has this characteristic.

Polyester fiber advantages

Polyester fiber advantages: bright luster, with flash effect, feel smooth, flat, good elasticity; Anti-wrinkling, anti-ironing, good light resistance; Hold the silk tightly and release it without obvious crease. Disadvantages: luster is not soft enough, poor air permeability, difficult staining, poor melting resistance, easy to form holes in soot, Mars and so on.

Advantages of spandex

Advantages of spandex:  large extension, good shape preservation, and wrinkle-free; The elasticity is the best, with good light resistance, acid resistance, alkali resistance, wear resistance; It has good dyeing properties and should not fade. Disadvantages: the worst strength, poor moisture absorption; Spandex is usually not used alone, but is blended with other fabrics; Poor heat resistance.

Spandex is a kind of polyurethane fiber.

Spandex is a kind of polyurethane fiber. Because of its excellent elasticity, it is also known as elastic fiber. It has been widely used in clothing fabrics and has the characteristics of high elasticity. It is mainly used in the manufacture of tights, sportswear, jockstrap and soles. Its variety according to the use needs, can be divided into the warp stretch fabric, the weft stretch fabric and the warp and weft two-way stretch fabric.

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