Q: How is incoming zipper inspection carried out?
Incoming inspection of zippers should be planned before the cartons arrive. Define the sample size from the lot, the acceptance number, and the characteristics to check: length, tape width, colour against the approved swatch, slider function, puller attachment, teeth alignment and end stops. Check the packing count and the shipping marks at the same time. Use a stated light source for colour and a calibrated rule for length. Record results on a simple form so a trend can be seen across lots. A common rule is to inspect the first cartons on arrival and to hold the rest until the first result is clear. If a defect is found, stop and quarantine the lot rather than sorting it into production. Photograph the defect with the carton label visible, because that evidence links the piece to the lot. Keep one retained sample per lot with its date and supplier reference.