Exhaust Dyeing Setting It Correctly on a Tech Pack
Exhaust Dyeing should be written into the tech pack with a value, a tolerance and a method. This removes ambiguity from quotations.
Definition to agree
dye transferred from bath to fabric in batch. Working figures for Exhaust Dyeing normally sit around liquor ratio 1:8 to 1:15 in mainstream production. Note jet or overflow machines on the tech pack so nobody tests against an older revision.
Target value
Open the specification at liquor ratio 1:8 to 1:15, adjusted to the end use. Record elastane content alongside Exhaust Dyeing, because blends shift the measured value. A result outside liquor ratio 1:8 to 1:15 usually points to process drift rather than to the fibre itself.
Method line
Always pair the target with jet or overflow machines so the mill and the laboratory test the same way. Keeping reference values for Exhaust Dyeing lets suppliers quote without extra sampling rounds. Ask for conditioning details together with jet or overflow machines, since both affect the reading.
Tolerance line
State plus or minus limits to keep production realistic while protecting the requirement. Working figures for Exhaust Dyeing normally sit around liquor ratio 1:8 to 1:15 in mainstream production. Note jet or overflow machines 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 Exhaust Dyeing, because blends shift the measured value. A result outside liquor ratio 1:8 to 1:15 usually points to process drift rather than to the fibre itself.
