How to distinguish the quality of metal zippers, resin zippers and nylon zippers?

1. Straightness of zipper The test method for zipper straightness is as follows: take a finished zipper, place it flat on a flat platform, let it be in a natural state, then use your fingers to move back and forth once on both sides of the edge of the chain element, and use a ruler to gradually move closer to the bend. , and then use another ruler to measure the distance between the chain element foot and the ruler. This distance is the straightness. 2. The strength of zippers The strength of a zipper is the most important performance indicator, which determines the scope of use and durability of the zipper. In the zipper standards of various countries, strength is clearly defined, and it is also the basis for testing the quality of the zipper. Different specifications and models of zippers have different strengths. For different uses, zipper suppliers will generally give a reference selection of specifications, models and scope of use. The specifications and models of the zipper must meet the requirements of use. Once confirmed, the specifications and models must meet the requirements of the order. 3. Zipper specifications The specifications of the zipper refer to the width and size range of the two consecutive teeth chain. The unit of measurement is millimeters. The specifications of the zipper refer to each component. The basis of shape and size is the most characteristic and important dimension. The zipper chain model is an important reflection of the shape, structure and performance characteristics. The zipper chain model not only includes the zipper chain specification requirements, but also reflects the zipper chain performance characteristics. That is, zipper technical parameters and usage functions. 4. Color of zippers and zipper tapes The color of the zipper and zipper tape must conform to the confirmation sample and return to the confirmation sample. If a larger body color is required, check again with the fabric. At the same time, check whether there is any color difference in the same zipper and zipper in the same batch. Generally, it should be above GRADE3 .

2023-09-16

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