Spandex
Translated name “Spandex”, is a kind of elastic fiber, the scientific name is Polyurethane (Polyurethane), abbreviated (PU). It is called “spandex” in mainland China. It is highly elastic and can be elongated 6 to 7 times, but it can quickly return to its original state with the loss of tension. Its molecular structure is a chain-like, soft and extensible Polyurethane enhances its properties by linking with hard segments. Elastic fibers are divided into two categories: one is polyester chains; the other is polyether chains.
Polyester elastic fiber has strong anti-oxidation and oil resistance; polyether elastic fiber has good anti-mildew and detergent resistance. Spandex has excellent elasticity. The strength is 2 to 3 times higher than latex yarn, the linear density is also finer, and it is more resistant to chemical degradation. Spandex has good acid and alkali resistance, sweat resistance, seawater resistance, dry cleaning resistance, and abrasion resistance.
Spandex is generally not used alone, but is incorporated into the fabric in a small amount. This fiber has both rubber properties and fiber properties. Most of it is used for core-spun yarns with spandex as the core yarn, called elastic core-spun yarn. The main characteristics of this kind of yarn are that it can obtain a good feel and appearance. The outer fiber composed of natural fiber has good moisture absorption; second, only 1-10% spandex filament can be used to produce high-quality stretch yarn; third, the elastic percentage control range is from 10% to 20%, which can be adjusted according to the use of the product , Choose a different elasticity value. It is easy to spin 25-2500 denier yarns of different thicknesses, so it is widely used to make elastic knitted fabrics, such as socks, furniture covers, ski wear, sportswear, medical fabrics, belts, elastic parts of space suits, etc.
What are the advantages and disadvantages of cotton and spandex?
Advantages: elastic, breathable and skin-friendly of cotton
Disadvantages: There are no obvious disadvantages, if you must say it, it is lack of skinny, and it is too close to wear
