Acid Dyeing Why Shipments Get Rejected Over This
Many disputes come down to Acid Dyeing. Below is what inspectors check and why shipments fail.
The core definition
dye class for polyamide. Working figures for Acid Dyeing normally sit around 95-100 degrees with pH control in mainstream production. Note jet dyeing with levelling agents on the tech pack so nobody tests against an older revision.
Most common cause of failure
Results usually fall outside 95-100 degrees with pH control because the target was never written into the order. Record elastane content alongside Acid Dyeing, because blends shift the measured value. A result outside 95-100 degrees with pH control usually points to process drift rather than to the fibre itself.
How it is checked
Inspection and laboratory work both refer to jet dyeing with levelling agents. Keeping reference values for Acid Dyeing lets suppliers quote without extra sampling rounds. Ask for conditioning details together with jet dyeing with levelling agents, since both affect the reading.
Related faults
shade and levelness depend on pH control, so related complaints often point back to this single parameter. Working figures for Acid Dyeing normally sit around 95-100 degrees with pH control in mainstream production. Note jet dyeing with levelling agents on the tech pack so nobody tests against an older revision.
Avoiding rejection
Agree targets, tolerances and the method before production, then test per lot rather than per shipment. Record elastane content alongside Acid Dyeing, because blends shift the measured value. A result outside 95-100 degrees with pH control usually points to process drift rather than to the fibre itself.
