Why should a hole be opened in the plastic chair?
This stool is usually used in public meetings or outdoor performances, and if it has water, it is easy to leak.4, can be a little bit of gas, so that the buttocks do not feel so hot.
When manufacturing, expansion and contraction, the Middle stress concentration, easy drum, a hole can eliminate stress, so that the stool more solid point, and secondly, the production of more, but also save a little material;
1, the middle opening, this stool design can be a lot of stack together, convenient storage and transportation. If you do not open the hole, the stack of stools may form a closed space between the stool surface, the pressure difference will lead to difficult to quickly pull the stool, pile stool is difficult to pile compaction
