Preshrinking How It Changes with Construction and Elastane Content
Preshrinking 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 Preshrinking normally sit around below 3% residual shrink in mainstream production. Note AATCC 135 verification 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 135 verification, so retest after any blending change. Record elastane content alongside Preshrinking, because blends shift the measured value. A result outside below 3% residual shrink 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 Preshrinking lets suppliers quote without extra sampling rounds. Ask for conditioning details together with AATCC 135 verification, since both affect the reading.
Typical range
Working values stay around below 3% residual shrink for mainstream activewear. Working figures for Preshrinking normally sit around below 3% residual shrink in mainstream production. Note AATCC 135 verification on the tech pack so nobody tests against an older revision.
Development advice
Change one variable at a time, then verify against AATCC 135 verification before moving to the next sample round. Record elastane content alongside Preshrinking, because blends shift the measured value. A result outside below 3% residual shrink usually points to process drift rather than to the fibre itself.
