Skewing and Spirality How It Changes with Construction and Elastane Content
Skewing and Spirality does not stay constant when construction changes. Understanding the direction of change helps during development.
Effect of knit structure
Loop length and density move results first, usually before any yarn change is made. Working figures for Skewing and Spirality normally sit around below 3% displacement in mainstream production. Note AATCC 179 skewness on the tech pack so nobody tests against an older revision.
Effect of elastane content
More elastane raises recovery but changes the value measured by AATCC 179 skewness, so retest after any blending change. Record elastane content alongside Skewing and Spirality, because blends shift the measured value. A result outside below 3% displacement usually points to process drift rather than to the fibre itself.
Effect of finishing
Heat setting and softeners shift results, which explains differences between a hand sample and bulk. Keeping reference values for Skewing and Spirality lets suppliers quote without extra sampling rounds. Ask for conditioning details together with AATCC 179 skewness, since both affect the reading.
Typical range
Working values stay around below 3% displacement for mainstream activewear. Working figures for Skewing and Spirality normally sit around below 3% displacement in mainstream production. Note AATCC 179 skewness on the tech pack so nobody tests against an older revision.
Development advice
Change one variable at a time, then verify against AATCC 179 skewness before moving to the next sample round. Record elastane content alongside Skewing and Spirality, because blends shift the measured value. A result outside below 3% displacement usually points to process drift rather than to the fibre itself.
