Stitch Length Setting It Correctly on a Tech Pack
Stitch Length should be written into the tech pack with a value, a tolerance and a method. This removes ambiguity from quotations.
Definition to agree
yarn length consumed per stitch. Working figures for Stitch Length normally sit around 2.6-3.4 mm typical stretch knit in mainstream production. Note machine cam setting on the tech pack so nobody tests against an older revision.
Target value
Open the specification at 2.6-3.4 mm typical stretch knit, adjusted to the end use. Record elastane content alongside Stitch Length, because blends shift the measured value. A result outside 2.6-3.4 mm typical stretch knit usually points to process drift rather than to the fibre itself.
Method line
Always pair the target with machine cam setting so the mill and the laboratory test the same way. Keeping reference values for Stitch Length lets suppliers quote without extra sampling rounds. Ask for conditioning details together with machine cam setting, since both affect the reading.
Tolerance line
State plus or minus limits to keep production realistic while protecting the requirement. Working figures for Stitch Length normally sit around 2.6-3.4 mm typical stretch knit in mainstream production. Note machine cam setting 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 Stitch Length, because blends shift the measured value. A result outside 2.6-3.4 mm typical stretch knit usually points to process drift rather than to the fibre itself.
