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What kind of fiber is spandex? What role does it play in clothing fabrics?

Update:14-02-2022
Summary:Spandex, also called Lycra, is a kind of fiber, because it has very good elasticity and is a fiber with strong elasticit...
Spandex, also called Lycra, is a kind of fiber, because it has very good elasticity and is a fiber with strong elasticity, so it is also called elastic fiber.
Spandex is widely used in modern clothing, and many clothing fabrics contain spandex components:
1. Most cotton T-shirts and bottoming shirts are not made of pure cotton, because there is too much cotton fabric and poor resilience. The knitted cotton cloth with spandex is called a pull frame, which has both the 
advantages of pure cotton cloth and good resilience, and the clothes are not easily deformed. Not all pull frames are made of cotton, but also polyester-cotton pull frames and chemical fiber pull frames.
2. The existence of spandex in the stretch denim makes the skinny jeans both sexy and comfortable to wear. Without the presence of spandex, it would be unthinkable for those skinny jeans to be worn every day.
3. Many elastic woven fabrics have spandex ingredients, which make the woven fabrics that are straight, hard and non-elastic become elastic. Such as stretch cotton, stretch hemp, stretch canvas, etc.
4. The knitted fabric itself has good elasticity, but there are still some knitted fabrics with spandex added to produce some special effects, such as swimwear fabrics, sweatshirt fabrics, and some fabrics with spandex as fibers, which are stretched on all sides.

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