zipper, a role that often appears in our life, it looks like a simple garment accessory, but it has a lot of knowledge. Do you really understand how it works?

① The chain teeth of the zipper are of different sizes and tooth shapes. At the same time, the chain teeth on the left and right sides of the same zipper must be of the same size. The zipper head is full of changes, which can be used as a handle and decoration. The zipper head can also be used as insurance, and will not automatically slide open when the zipper is closed. The working principle of the zipper is very simple, that is, the two zipper tapes can be pulled or pulled apart at will, or locked and opened at will.

(2) Each tooth of the zipper chain tooth is a small hook, which can match the hole under a small tooth on the other cloth belt next to it. This zipper is very firm and can only be opened when the slider slides to open the teeth.

(3) Working principle: The matching two chain dental straps can be pulled together or pulled apart at will through the action of the slider. When the slider moves forward, the feet of the two chain teeth on the chain teeth are pushed due to the shape of the closing angle of the inner cavity of the slider, thus engaging with each other regularly, which forms the closed state of the zipper. When the slider is pulled to the apex of the zipper, the width after the upper stop is closed is greater than the width of the narrow part of the inner cavity of the slider, which plays a limiting role on the slider, so that the slider will not fall off from the chain belt. When the slider is pulled backward, the tooth front and tooth valley of the chain teeth are separated one by one due to the split angle (dihedral angle) formed by the cylindrical surfaces on both sides of the pull body column in the inner cavity of the slider, separate the two strainers. When the slider is pulled to the bottom of the chain, the width of the lower upper stop (also called the upper and lower codes) is greater than the width of the inner cavity of the slider and plays a limiting role, so that the slider will not fall off the chain belt.