1. Zipper application objects When purchasing zippers, the purchaser should inform the zipper manufacturer, which type of product the zipper is used for, and whether there are any special post-processing requirements for the product, such as ordinary water washing or acid enzyme washing.

The jamming phenomenon of the zipper head usually occurs in the following situations: 1. When opening and closing the zipper, sometimes the zipper cannot be moved because the zipper head is caught in the cloth.

In the zipper market, metal zippers and plastic zippers made of gold, copper, aluminum or silver are generally divided into metal zippers and plastic zippers. Among these materials, plastic zippers are very easy to catch and break, but nylon zippers are more flexible. It can "self-repair", which means that the polyester will reconnect after the zipper slides over the problematic place.

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, and then use your fingers to move it back and forth along the sides of the chain teeth once. The ruler gradually moves closer to the bend.