Seam Slippage Setting It Correctly on a Tech Pack
Seam Slippage should be written into the tech pack with a value, a tolerance and a method. This removes ambiguity from quotations.
Definition to agree
yarn movement away from the seam. Working figures for Seam Slippage normally sit around below 6 mm at 60 N in mainstream production. Note ISO 13936-2 fixed load on the tech pack so nobody tests against an older revision.
Target value
Open the specification at below 6 mm at 60 N, adjusted to the end use. Record elastane content alongside Seam Slippage, because blends shift the measured value. A result outside below 6 mm at 60 N usually points to process drift rather than to the fibre itself.
Method line
Always pair the target with ISO 13936-2 fixed load so the mill and the laboratory test the same way. Keeping reference values for Seam Slippage lets suppliers quote without extra sampling rounds. Ask for conditioning details together with ISO 13936-2 fixed load, since both affect the reading.
Tolerance line
State plus or minus limits to keep production realistic while protecting the requirement. Working figures for Seam Slippage normally sit around below 6 mm at 60 N in mainstream production. Note ISO 13936-2 fixed load 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 Seam Slippage, because blends shift the measured value. A result outside below 6 mm at 60 N usually points to process drift rather than to the fibre itself.
