1. The straightness of the zipper

The test method for the straightness of the zipper is: take a finished zipper and place it on a flat table to make it in a natural state, then use your fingers to move back and forth along both sides of the chain teeth, and use a ruler to gradually move closer to the bend. , And then use another ruler to measure the distance between the foot of the chain and the ruler. This distance is the straightness.

2. The strength of the zipper

The strength of the zipper is the most important performance index, which determines the scope and durability of the zipper. In the zipper standards of various countries, the strength is clearly stipulated, 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. Zipper suppliers generally give a reference choice for specifications, models and scope of use. The specifications and models of the zipper must meet the requirements for use. Once confirmed, the specifications and models must meet the requirements of the order.

3. The specifications of the zipper

The specification of the zipper refers to the width and size range of the chain after the two connected teeth are joined. The unit of measurement is millimeters. The specification of the zipper is the basis for the shape and size of each component, and is the most characteristic and important dimension. 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 and requirements of the zipper, but also reflects the performance characteristics of the zipper, that is, the technical parameters and use functions of the zipper.

4. The color of the zipper and zipper tape

The color of the zipper and zipper tape must be in accordance with the confirmation sample. If a body color is required, check again with the fabric. At the same time, check whether the same zipper has color difference, and whether the same batch of zippers has color difference, generally it should be above GRADE3.