Misalignment: Misalignment (错牙)
A defect in which the two tooth rows do not line up or interlock correctly when the zipper is closed. It may be caused by uneven tape width, twisted sewing, incorrect slider size, bent teeth or poor pin and box alignment. Misalignment increases drag, causes partial opening and looks defective. It is checked by closing the chain and inspecting the joint along its length, and by measuring closed width at several points.