1. Flatness of zipper
The test method of the flatness of the zipper is: take a finished zipper, put it flat on the flat platform, so that it is in a natural state, and then move back and forth with your finger along the edge of the chain teeth on both sides of the side, gradually close to the bend with the ruler, and then measure the distance between the chain teeth and the ruler with another ruler, and this distance is the flatness.
2, the strength of the zipper
The strength of the zipper is the most important performance indicator, which determines the scope and durability of the zipper. In the zipper standards of various countries, there are clear provisions on the strength, and it is also the basis for testing the quality of the zipper. Different specifications and models of zippers have different strengths for different purposes, and zipper suppliers generally give a reference choice of specifications and ranges 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 specification of the zipper refers to the width size and size range of the tooth chain after the two teeth are combined, the unit of measurement is millimeter, and the specification of the zipper is the basis for the shape and size of the components, which is the most important size with characteristics. The model of the zipper is an important reflection of the shape, structure and performance characteristics. The model of the zipper not only includes the specifications of the zipper, but also reflects the performance characteristics of the zipper, that is, the technical parameters and the use function of the zipper.
4. Color of zipper and zipper belt
The color of the zipper and zipper strap must conform to the confirmation card. If it is required to match the large body color, it is also necessary to check again with the fabric, and check whether the same zipper has color difference, and whether the same batch of zippers has color difference, it should generally be above GRADE3.