Why is the slider not closing the chain?
Check that the slider and chain are from the same zip supplier and are the correct sizes to match one another.
Why is the zip is curved / humpy after stitching continuous zip chain to the product?
Spiral / coil zips have an S twist and Z twist in the teeth creating a ‘smile’ or ‘frown’ appearance when the teeth are joined. The left and right teeth should be both in the same direction/condition. If this is not the problem, check the sewing tension is equal on both sides of the zip.
Why is the slider sticking / jamming on the chain after insertion?
Check that there is sufficient clearance for the slider to pass along the length of the zip. Check that there is no adhesive accidentally applied to the zip teeth or inside the slider during insertion. Check that no side seams interrupt the travel of the slider along the chain. Recommended distance is 2mm from the […]