1.Spandex fiber
Spandex fiber (referred to as PU fiber) belongs to the polyurethane structure with high elongation, low elastic modulus and high elastic recovery rate. In addition, spandex also has excellent chemical stability and thermal stability. It is more resistant to chemicals than latex silk. Degradation, the softening temperature is above 200 ℃. Spandex fibers are resistant to perspiration, seawater and various dry cleaners and most sunscreens. Long-term exposure to sunlight or chlorine bleach can also fade, but the degree of fading varies widely depending on the type of spandex. Clothing made of spandex-containing fabric has good shape retention, stable size, no pressure and comfortable wearing. Usually, only 2% to 10% of spandex can be added to make underwear soft and close to the body, comfortable and beautiful, make sportswear fit soft and move freely, and make fashion and casual clothes have good drape, shape retention and fashion. Therefore, spandex is an indispensable fiber for the development of highly elastic textiles.
2.Polytrimethylene terephthalate fiber
Polytrimethylene terephthalate fiber (PTT fiber for short) is a new product in the polyester family. It belongs to polyester fiber and is a common product of polyester PET. PTT fiber has both the characteristics of polyester and nylon, soft hand, good elastic recovery, easy to dye under normal pressure, bright color, good dimensional stability of the fabric, very suitable for the field of clothing. PTT fiber can be blended, twisted and interwoven with natural fibers or synthetic fibers such as wool and cotton, and can be used in woven fabrics and knitted fabrics. In addition, PTT fibers can also be used in industrial fabrics and other fields, such as the manufacture of carpets, decorations, webbing and so on. PTT fiber has the advantages of spandex elastic fabric, and the price is lower than that of spandex elastic fabric. It is a promising new fiber.
3.T-400 fiber
T-400 fiber is a new type of elastic fiber product developed by DuPont for the limitation of spandex fiber in textile applications. T-400 does not belong to the spandex family. It is spun side by side of two polymers, PTT and PET, with different shrinkage rates. It is a side-by-side composite fiber. It solves many problems of spandex such as difficult dyeing, excess elasticity, complex weaving, unstable fabric size and spandex aging during use.
The fabrics made of it have the following characteristics:
(1) The elasticity is easy, comfortable and durable; (2) The fabric is soft, stiff and has good drape; (3) The cloth surface is flat and has good wrinkle resistance; (4) Moisture absorption and quick drying, smooth hand feeling; (5) Good dimensional stability and easy to handle.
T-400 can be blended with natural fibers and man-made fibers to improve strength and softness, the appearance of blended fabrics is clean and smooth, the outline of clothing is clear, the clothing can still maintain a good shape after repeated washing, the fabric has good color fastness, not easy to fade, long-lasting Dressed as new. At present, T-400 is widely used in trousers, denim, sportswear, high-end women's clothing and other fields because of its excellent wearing performance.
The combustion method is to identify the type of fiber by using the difference in the chemical composition of various fibers and the difference in the combustion characteristics produced. The method is to take a small bundle of fiber samples and burn them on fire, carefully observe the burning characteristics of the fibers and the shape, color, softness and hardness of the residues, and at the same time smell the odor produced by them.
Burning characteristics of three elastic fibers
| fiber type | close to the flame | contact flame | leave the flame | burning smell | Residue characteristics |
| PU | shrink | melt burning | self-destruction | peculiar smell | white gelatinous |
| PTT | shrink | melt burning | molten burning liquid falling black smoke | pungent smell | brown wax flakes |
| T-400 | shrink |
melt burning |
Molten combustion fluid emits black smoke |
sweet |
hard and black bead |
We are specialized in Polyetser Viscose Fabric with or without spandex,Wool Fabric,Polyester Cotton Fabric,if you want to learn more,welcome to contact us!
Post time: Oct-20-2022