Bonding How It Changes with Construction and Elastane Content
Bonding 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 Bonding normally sit around film thickness 0.05-0.15 mm in mainstream production. Note ISO 15797 dimensional check plus peel test 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 ISO 15797 dimensional check plus peel test, so retest after any blending change. Record elastane content alongside Bonding, because blends shift the measured value. A result outside film thickness 0.05-0.15 mm 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 Bonding lets suppliers quote without extra sampling rounds. Ask for conditioning details together with ISO 15797 dimensional check plus peel test, since both affect the reading.
Typical range
Working values stay around film thickness 0.05-0.15 mm for mainstream activewear. Working figures for Bonding normally sit around film thickness 0.05-0.15 mm in mainstream production. Note ISO 15797 dimensional check plus peel test on the tech pack so nobody tests against an older revision.
Development advice
Change one variable at a time, then verify against ISO 15797 dimensional check plus peel test before moving to the next sample round. Record elastane content alongside Bonding, because blends shift the measured value. A result outside film thickness 0.05-0.15 mm usually points to process drift rather than to the fibre itself.
