The principle of zipper operation is very simple, many people should know. When I WAS A CHILD FEEL SUPER MAGIC, UP TO PULL CAN CLOSE, DOWN TO PULL CAN OPEN, OFTEN CAN PULL UP TO PROVOKE PARENTS SCOLD, BELIEVE THAT MANY FRIENDS HAVE SUCH A CHILDHOOD MEMORY XD. As can be seen from the picture above, the shape OF the chain on both sides is the same, and the teeth are convex at the top and concave at the bottom to facilitate complete bonding.

Some understanding of the principle of zipper friends, about can know that the two sides of the chain in separate, is a bending state, this time on the chain between the teeth of the distance between each other is slightly larger (hereinafter referred to as the tooth distance). This slightly larger tooth spacing is enough to allow the two chains to join each other. The way the two chains are combined is to use the Y-shaped design of the chain head treatment, when pulled up, the teeth on both sides of the chain because of the distance is large enough, so you can buckle into each other. When buckled in, the tooth distance is narrowed, just on both sides of the chain teeth tightly buckle, so that the zipper will not jump open.

And when you pull the Y-chain down by hand, the Y-rail pulls the chain apart, and the chain is bent, so the distance between the teeth becomes larger, and the chain naturally separates.