AATCC 179:2004 pdf download.Skewness Change in Fabric and Garment Twist Resulting from Automatic Home Laundering
1.1 This test method determines change in skewness in woven and knitted fabrics or twist in garments when sub- jected to repeated automatic laundering procedures commonly used in the home. Washing and drying procedures used for shrinkage tests and other home launder- ing tests are specified for this method.
1.2 For some fabrics the degree of twist of fabric in garments is not solely dependent on its behavior in the unsewn state; it also may be dependent on the ; manner of garment assembly.
2. Principle
2.1 Change in skewness in fabric or twist in garment specimens resulting from procedures typical of home launder- ing practices is measured using bench marks applied to the specimens before laundering.
3. Terminology
3.1 garment twist, n.- a rotation, usu- ally lateral, between different panels of a garment resulting from the release of la- tent stresses during laundering of the WO- ven or knitted fabric forming the gar- ment. Twist may also be referred to as torque or spirality.
3.2 laundering, n.- of textile materi- als, a process intended to remove soils and/or stains by treatment (washing) with an aqueous detergent solution and nor- mally including rinsing, extraction and drying.
6.2.2 Where possible, cut specimens from different areas of the fabric so that each specimen will contain different groups of lengthwise and widthwise yarns. Identify fabric face; mark length- wise direction on each specimen.
6.2.3 If it is of interest to determine whether the direction of the change in skewness is different from one side of the fabric to the other, prepare three sets of specimens from each area of interest. Identify area from which each set of specimens was taken; ie, left-side, cen- ter or right-side.
6.2.4 Test specimens prepared for AATCC Method 124， Appearance of Fabrics after Repeated Home Launder- ing, and AATCC Method 135, Dimen- sional Changes of Fabrics after Home Laundering, may be used for this test method when marking by Method 1 (see 12.9).AATCC 179 pdf download.