Spandex is a commonly used fiber variety in our daily lives, with obvious characteristics of good elasticity and advantages such as low fineness, high elastic modulus (elongation at break can reach 400 to 800%), and low specific gravity. Spandex can be blended with textile fibers such as nylon, wool, cotton, polyester, acrylic, and viscose to create a soft, elastic, and comfortable fabric. It is widely used in fitness wear, swimwear, jeans, leggings, underwear, jumpsuits, and underwear. Because women have higher requirements for close fitting clothing, spandex fabric is more favored by women.

Because spandex molecular chains contain many reactive groups such as amino groups, they are prone to yellowing during high-temperature setting or storage, which affects the quality of finished products, especially fluorescent whitening fabrics and light colored fabrics. Because spandex uses silicone oil lubricants and other additives during the weaving process to improve its spinning performance. These additives will naturally degrade over time, causing the fibers to turn yellow. In addition, spandex itself is not easy to color, which means that conventional dyes cannot color spandex. Therefore, after dyeing the fabric, if the restoration and cleaning are not sufficient, the so-called yellowing phenomenon will also occur.

Article source: Nylon colored yarn

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