How to make fabrics soft, elastic, smooth and wrinkle-resistant?

Spandex, the full name of polyurethane fiber, is a fiber made of block copolymers containing at least 85% polyurethane segments. The macromolecules of the copolymer are composed of two segments: one is called the soft segment, which is in a highly elastic state at room temperature, with curled molecular chains, and is easily deformed under stress, thus giving the fiber the characteristic of being easily stretched and deformed; the other is called the hard segment, which is composed of aromatic diisocyanates and chain extenders containing multiple polar groups, which are crystalline and can produce lateral cross-linking between macromolecules. It basically does not deform under stress and acts as a "bonding" point, thereby preventing slippage between macromolecular chains. Spandex denim fabrics containing spandex are generally core-spun yarns or covered yarns centered on spandex. According to the physical and chemical properties of spandex, the elastic denim products containing spandex lose elasticity during the washing process. This is because the spandex fiber is affected by external conditions, such as chemicals, moisture, heat, etc., and the fiber itself is destroyed, causing breakage and loss of elastic recovery properties. The fabric cannot shrink freely after being stretched, causing loss of elasticity. In the washing and dyeing of denim products, once the elasticity is lost due to the degradation of spandex, it is basically difficult to repair, so the only way to control the elasticity is through prevention.

Elasticity loss phenomenon There are generally two phenomena of elasticity loss:

First, the shrinkage rate is inaccurate, and the finished product size is too large or too small

Second, blistering around the bone position

What is the cause of the elasticity loss of spandex?

1. The fabric is too poor! You can use "Kening spandex elastic protective agent" to prevent elasticity loss

2. Environmental factors: temperature, humidity, pH

Temperature washing temperature, drying temperature, oven temperature; too high or too low temperature may cause elasticity loss; humidity Due to the strong moisture absorption capacity of cellulose fiber, it is easy to expand in anisotropic manner, so that spandex is covered by cellulose fiber, resulting in "false elasticity loss" pH is too acidic, the elastic tear force loss is large, and at the same time, it is brittle and loses elasticity. If the pH is too alkaline, the ester bond in the polyurethane will degrade and lose elasticity.

How to solve the problem of elasticity loss and breakage?

Spandex Protectant Sylic FU5600

Sylic FU5600 is a new additive that can be used to prevent the shrinkage and breakage of elastic Lycra yarns in spandex stretch fabrics. It can also be used in fabric finishing to prevent the displacement of fibres from each other, which makes the fabric more complete and improves the drape.

1. It is used on regenerated cellulose fibres, high wet modulus viscose fibres, polyester fibres, nylon fibres, cotton blends and other fibre products to provide excellent anti-slip effects.

2. It is used to prevent the loss of elasticity and strength of elastic denim garments or fabrics during desizing, enzymatic washing (cellulase), chlorine bleaching or resin finishing.

3. Used in the pretreatment of elastic white fabric, it can prevent the loss of elasticity and strength of spandex.

4. It has excellent heat resistance and does not cause yellowing.

5. It prevents spandex elastic yarn and wrapping yarn from separating and slipping off during washing, has excellent adhesion, penetrates into the fibre and plays a fixed protective role.

6. This product does not contain APEO, formaldehyde, VOC and other restricted substances.

7. It is anionic product, can not be mixed with cationic products.

If you want to know more about dyeing solutions, please contact:  info@sylicglobal.com