Why need Dimensional Stability to Washing test for fabric & garments, Why failures and How improvements Dimensional Stability of garmet & fabric.

Why need woven & knit fabrics / garments Dimensional Stability to Washing test?
Did you ever have a sweatshirt that shrunk? Is it now above your waist. How about a pair of jeans that got real tight after the first washing and shorter on the length.

A textile that can maintain it’s original shape after use and care is said to be dimensionally stable.

Manufacturers concerns are with residual shrinkage and relaxation shrinkage. Residual shrinkage is what takes place over a period of time from laundering and care.

Relaxation shrinkage occurs when the strained yarns relax after the stress placed on them is released. When washing these goods the fabric tension is relaxed and they come to relaxed state.

Why Failure Dimensional Stability to Washing test ????

-During spinning, weaving, bleaching, dyeing and the various finishing processes, yarns and cloth are under a continuous tension.
-Yarns and/or fabrics are not fixed materials. They consist of separate, stretchable fibers which submit to the tension. In other words, fabrics do stretch in length and width.
-The tension within the yarns is eliminated when friction occurs during laundering where both water and soap act as a lubricant.
-The lubricant, along with the mechanical action of the washer, helps the fibers relax and contract to their original length before the elongation takes place.
-This means that the fabric shrinks.

How to improve Dimensional Stability to Washing for garment & fabric????

A mechanical means of reducing the shrinkage (compacting, overfeeding, Sanforising) is suggested.

compacting, overfeeding, Sanforising machine

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