1. The straightness of the zipper
The test method for the straightness of the zipper is: take a finished zipper, lay it flat on a flat platen to make it in a natural state, then move your fingers back and forth along both sides of the edge of the fastener 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 the zipper
The strength of the 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, the 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 suitable for For different uses, zipper suppliers will generally give a reference selection of specifications and scope of use. The specifications and models of zippers must meet the requirements of use. Once confirmed, the specifications and models must meet the requirements of the order.
3. Specification of zipper
The specification of the zipper refers to the width and size range of the chain after the two connecting teeth are engaged. The unit of measurement is millimeters.
The basis of shape and size is the most characteristic and important dimension. The model of the zipper chain is an important reflection of the shape, structure and performance characteristics. The model of the zipper chain not only includes the specification requirements of the zipper chain, but also reflects the performance characteristics of the zipper chain.
4. Color of zipper and zipper tape
The color of the zipper and zipper tape must conform to the confirmation sample card. If the color of the body is required to match, it must be checked with the fabric again, and at the same time, check whether there is any color difference in the same zipper and whether there is any color difference in the same batch of zippers.