Fabric Growth How It Changes with Construction and Elastane Content
Fabric Growth 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 Fabric Growth normally sit around below 6% target in mainstream production. Note ASTM D2594 stretch properties 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 ASTM D2594 stretch properties, so retest after any blending change. Record elastane content alongside Fabric Growth, because blends shift the measured value. A result outside below 6% target 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 Fabric Growth lets suppliers quote without extra sampling rounds. Ask for conditioning details together with ASTM D2594 stretch properties, since both affect the reading.
Typical range
Working values stay around below 6% target for mainstream activewear. Working figures for Fabric Growth normally sit around below 6% target in mainstream production. Note ASTM D2594 stretch properties on the tech pack so nobody tests against an older revision.
Development advice
Change one variable at a time, then verify against ASTM D2594 stretch properties before moving to the next sample round. Record elastane content alongside Fabric Growth, because blends shift the measured value. A result outside below 6% target usually points to process drift rather than to the fibre itself.
