Wales per Inch (WPI) Why Shipments Get Rejected Over This
Many disputes come down to Wales per Inch (WPI). Below is what inspectors check and why shipments fail.
The core definition
number of vertical stitch columns per inch. Working figures for Wales per Inch (WPI) normally sit around 20-40 depending on gauge in mainstream production. Note knitting machine setting on the tech pack so nobody tests against an older revision.
Most common cause of failure
Results usually fall outside 20-40 depending on gauge because the target was never written into the order. Record elastane content alongside Wales per Inch (WPI), because blends shift the measured value. A result outside 20-40 depending on gauge usually points to process drift rather than to the fibre itself.
How it is checked
Inspection and laboratory work both refer to knitting machine setting. Keeping reference values for Wales per Inch (WPI) lets suppliers quote without extra sampling rounds. Ask for conditioning details together with knitting machine setting, since both affect the reading.
Related faults
it sets width-related stability, so related complaints often point back to this single parameter. Working figures for Wales per Inch (WPI) normally sit around 20-40 depending on gauge in mainstream production. Note knitting machine setting 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 Wales per Inch (WPI), because blends shift the measured value. A result outside 20-40 depending on gauge usually points to process drift rather than to the fibre itself.
