Two-Way Stretch Setting It Correctly on a Tech Pack
Two-Way Stretch should be written into the tech pack with a value, a tolerance and a method. This removes ambiguity from quotations.
Definition to agree
extension mainly across the width. Working figures for Two-Way Stretch normally sit around 20-40% typical in mainstream production. Note ASTM D6614 stretch woven test on the tech pack so nobody tests against an older revision.
Target value
Open the specification at 20-40% typical, adjusted to the end use. Record elastane content alongside Two-Way Stretch, because blends shift the measured value. A result outside 20-40% typical usually points to process drift rather than to the fibre itself.
Method line
Always pair the target with ASTM D6614 stretch woven test so the mill and the laboratory test the same way. Keeping reference values for Two-Way Stretch lets suppliers quote without extra sampling rounds. Ask for conditioning details together with ASTM D6614 stretch woven test, since both affect the reading.
Tolerance line
State plus or minus limits to keep production realistic while protecting the requirement. Working figures for Two-Way Stretch normally sit around 20-40% typical in mainstream production. Note ASTM D6614 stretch woven test on the tech pack so nobody tests against an older revision.
Approval step
Approve the result on pre-production bulk rather than on development fabric only. Record elastane content alongside Two-Way Stretch, because blends shift the measured value. A result outside 20-40% typical usually points to process drift rather than to the fibre itself.
