Cover Factor Setting It Correctly on a Tech Pack
Cover Factor should be written into the tech pack with a value, a tolerance and a method. This removes ambiguity from quotations.
Definition to agree
how completely yarns close the fabric surface. Working figures for Cover Factor normally sit around higher is more opaque in mainstream production. Note calculated from yarn and density on the tech pack so nobody tests against an older revision.
Target value
Open the specification at higher is more opaque, adjusted to the end use. Record elastane content alongside Cover Factor, because blends shift the measured value. A result outside higher is more opaque usually points to process drift rather than to the fibre itself.
Method line
Always pair the target with calculated from yarn and density so the mill and the laboratory test the same way. Keeping reference values for Cover Factor lets suppliers quote without extra sampling rounds. Ask for conditioning details together with calculated from yarn and density, since both affect the reading.
Tolerance line
State plus or minus limits to keep production realistic while protecting the requirement. Working figures for Cover Factor normally sit around higher is more opaque in mainstream production. Note calculated from yarn and density 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 Cover Factor, because blends shift the measured value. A result outside higher is more opaque usually points to process drift rather than to the fibre itself.
