Exhaust Dyeing Test Methods and Acceptable Limits
Exhaust Dyeing is verified through jet or overflow machines. Knowing how the method works avoids rejecting fabric that actually meets the requirement.
Method overview
jet or overflow machines defines sample size, conditioning and calculation, so values are comparable only within the same revision. 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.
Result interpretation
Read the value together with construction notes; liquor ratio 1:8 to 1:15 is only meaningful for similar fabrics. 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.
Typical limits
Buyers commonly write liquor ratio 1:8 to 1:15 with a stated tolerance, then verify against jet or overflow machines. 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.
Sources of variation
Conditioning time, operator technique and shade all influence the result. 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.
Documentation
Record the standard revision on every report, because older versions can differ from current practice. 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.
