Skipped Teeth: Skipped Teeth (掉牙)
A defect in which one or more teeth are missing or have detached from the tape, leaving a gap in the chain. Causes include shallow tooth setting, weak monofilament, damaged moulds, improper cutting and excessive needle penetration during sewing. A skipped tooth allows the slider to jam or the chain to split, and it is not acceptable for load-bearing or safety-related products. Inspection is visual and tactile along the whole chain.