Why is the heat setting necessary for Lycra?

SPANDEX IN KNIT FABRICS Regardless of end use, the fabric should be relaxed before dyeing to reduce residual stresses caused by tensioning of the elastic yarns during knitting. Heat-setting will also prevent cockling or crepeing of the yarns, distortion of the structure, and uneven dyeing and finishing.

Why is heat setting necessary for fabric preparation finishing?

Heat setting can eliminate the tendency of undesirable torquing. At the winding, twisting, weaving, tufting and knitting processes, the increased tendency to torquing can cause difficulties in processing the yarn.

Why is heat setting necessary?

Heat-setting is a heat treatment by which shape retention, crease resistance, resilience and elasticity are imparted to the fibres. It also brings changes in strength, stretchability, softness, dyeability and sometimes on the colour of the material.

How do you heat set Lycra?

Achieving best heat setting means perfect dimensional stability of the knitted fabric. During heat setting process the fabric is passed through heated chambers of 200C for achieving the desired property of the Lycra knitted fabric.

What temperature does spandex melt?

2300C
Spandex fiber is heat sensitive. Although spandex melting temperature is 2300C, Elastane properties may be affected or be damaged at a temperature above 1800 So care should be taken on temperature from pretreatment to finishing. Hot alkali can damage spandex.

Can Polyester be heat set?

Heat setting is the process applicable to fabrics made from synthetic fibres like nylon, polyester in which the fabric is subjected to the action of high temperature for a short time to make it dimensionally stable so that the garments made from such fabrics retain their shape on washing and ironing.

What is the required heat temperature in cotton fiber?

The optimum temperature for mold development is 25 – 35°C. Cotton is subject to self-heating/spontaneous combustion. The autoignition temperature of oily cotton is 120°C. At temperatures < 0°C there is no risk of wet bales rotting, since this process stops at low temperatures.

Can cotton heat set?

Heat-setting is one of the most common methods used to improve the dimensional stability of cotton/elastane fabrics. The developed response surface regression models can be used for predicting and optimizing the dimensional stability properties of cotton/elastane fabrics.

What is cotton spandex made of?

Cotton the natural fiber known and Lycra is an exceptionally stretchy, synthetic fiber with increased elasticity and is famous under the name ‘Spandex’. These fabrics are generally manufactured by wrapping cotton fibers onto the filaments of spandex, which is a bunch of several tiny synthetic filaments.

Can you heat press on cotton Spandex?

Rayon and Spandex are synthetic materials often blended with other fabrics such as cotton and polyester. While you can safely apply heat transfer vinyl to polyester and cotton safely, other materials may introduce variables that can cause issues, particularly with darker color garments. …