Dongguan garment factory teaches you the common identification methods of zipper quality:
1) Cloth: The cloth should be dyed uniformly, without stains, scars, and soft to the touch. The cloth should be wavy in the vertical or horizontal direction. 2) Teeth: The surface of the teeth should be smooth. And the noise is small 3) slider: the self-locking slider pulls easily and locks easily and locks without slipping 4) the patch: the patch is fastened to the tape, not easy to break and fall off 5) the box, the sheath: inserts freely, tightly Cloth tape 6) Top stop, bottom stop:
a. The top stop should be fastened to the first tooth (metal, nylon), the distance cannot exceed 1mm and it is strong and perfect. b, the bottom stop is fastened to the teeth or clamped on it, and strong and perfect.