Q: Why is the finished zipper length shorter than ordered?
Length can change at cutting, at sewing or at finishing, and the stage where it changes decides the fix. Measuring at each stage takes a few minutes and prevents an argument that is based on two different definitions of length.
- Measure a sample from the unopened pack against the order.
- Measure after cutting and after sewing, recording each stage.
- Check for tape shrinkage from heat or washing during making-up.
- Confirm how length is defined: chain length, tape length, or finished length including stops.
- Compare the measurement method with the maker's definition before claiming a short shipment.
A short measurement from the pack is a supply issue, while shortening during making-up points to heat, tension or washing. Because length definitions differ, agree the measuring method in writing before production, and judge a difference of a few millimetres against the agreed tolerance rather than against a nominal number.