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In recent years, gas-assisted injection molding technology has been used in the production of many plastic parts, such as televisions or audio enclosures, automotive plastic products, furniture, kitchen utensils and daily necessities, various types of plastic boxes and toys and so on. Compared with ordinary injection molding, gas-assisted injection molding technology has many unparalleled advantages. It can not only reduce the manufacturing cost of plastic products, but also solve the product shrinkage deformation, solve the problem of surface sink marks, improve the surface of the product quality. In the case that the parts can meet the same requirements, the use of gas-assisted injection can greatly save the plastic raw materials, and its saving rate can be as high as 20-40%. On the one hand, the reduction in the amount of plastic materials brings about a reduction in the time of each cycle of the entire molding cycle; on the other hand, through the introduction of high-pressure gas inside the parts, the shrinkage deformation of the parts has been greatly improved, so the injection pressure is maintained.