1. When the opening and closing is not smooth, such as the zipper puller is forced, there will be a tooth occlusion failure. During this time, use paraffin or lubricating spray to coat the surface and inside of the teeth, then slip them off after pulling the head a few times;
2. When one thing is packed too much, the zipper on the bag, if the zipper is closed, the zipper will be too stressed, and the braces will be removed from the belt. This is a zipper failure, which is quite serious. Tighten the left and right gears so they can easily pass through the back closure zipper;
3. When opening the zipper, sometimes the chain head is used to bite the slider or cloth strip, so that the slider cannot be pulled. In this case, if the slider is forced to be pulled, it will bite deeper and deeper. Pull the head back and the other side should untie the cloth. When fully bite, do not pull the head hard, pull back slowly. In addition, when sewing the zipper, do not leave hidden dangers;
4. The clothes are worn for a long time and the zipper is not good. This is because the slider of the zipper is loose. At this time, you can use pliers (you can bite with tooth pliers) to pinch the slider, so that the zipper will be good;
