Q: What causes zipper failure and who is responsible?
Zipper failure usually comes from one of four places: the component, the assembly, the garment process or the use. A slider that opens under load may have a worn or undersized spring; a chain that splits may have a misaligned tooth or a damaged end stop; a tape that stiffens may have been overheated in pressing; a puller that breaks may have been caught on a machine. The pattern of failure points to the cause: failures at the same position in a lot suggest a production issue, while scattered failures across lots suggest handling or use. Ask for the failed pieces and the conditions of use, then compare with the specification and the test report. A root-cause review should identify the process step, not just the symptom. If the cause is in the garment process, the fix belongs in the sewing or laundry instruction. Record the finding so future orders can avoid the same condition.