Spandex is a kind of polyurethane fiber. Because of its excellent elasticity, also known as elastic fiber, it has been widely used in clothing fabrics. The main features of spandex fabric are:
1, spandex has high elasticity. Generally, 100% polyurethane is not used in products, but 5-30% polyurethane is mixed in fabrics. The comfort elasticity of various spandex fabrics is 15%-45%.
2. Polyurethane fabrics often use composite yarns, that is, spandex is the core and other fibers (such as nylon and polyester). ) As the skin layer to make core-spun yarn elastic fabric, it has good adaptability to the body and is very suitable for making tights without oppression.
3. The appearance style and wearability of spandex elastic fabric are close to those of similar products coated with outer fiber fabric.
Extended data:
The biggest advantage of spandex fabric is its good elasticity, which can be stretched 5-8 times without aging. Spandex can not be woven alone, but usually with other raw materials. The proportion of spandex is about 3- 10%, and the proportion of spandex in swimsuit fabric reaches 20%. Polyurethane fiber is a kind of synthetic fiber with high elongation at break (above 400%), low modulus and high elastic recovery rate.
Spandex has high elongation (500% ~ 700%), low elastic modulus (200% elongation, 0.04 ~ 0. 12g/ denier) and high elastic recovery (200% elongation, 95% ~ 99%). In addition to high strength, other physical and mechanical properties are very similar to those of natural latex yarn. It is more resistant to chemical degradation than latex wire, with moderate thermal stability and softening temperature above 200℃.
Most dyes and finishing agents used for synthetic fibers and natural fibers are also suitable for dyeing and finishing spandex. Spandex is sweat-resistant, seawater-resistant, resistant to all kinds of dry cleaners and most sunscreen oils. Long-term sun exposure or chlorine bleach will also fade, but the degree of fading varies with the type of spandex.
Baidu encyclopedia-spandex fabrics