Plastic is a kind of high molecular compound, which is formed by the addition polymerization/condensation reaction of monomers. Nowadays, plastic products have appeared in a large number of products in our lives. my country's injection mold processing industry began to develop in the 1980s. From 1999 to 2002, the total output value of this industry increased by 11.5 billion. After experiencing a relatively large increase, the current technology of this industry has become mature, and the growth of GDP has also stabilized.

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Common plastics currently on the market include PA (nylon), PE-polyethylene, PP-polypropylene, PS-polystyrene and so on. Plastic has been widely used since it was invented by Baekeland and Leo Hendrik in 1909. Because of its low density and its excellent characteristics of insulation and corrosion resistance, it has replaced metal in many occasions and has become a popular material.

Since then, the plastic injection developed is a method of manufacturing industrial products using different molds and various numerical control processing methods. According to the different materials used, it will be divided into rubber and plastic injection molding; according to the way of industrial production, it can be divided into Molding-molding molding method and Die Casting-die casting molding method. In the face of daily rubber/plastic/molding injection, we can distinguish them by their different characteristics. The method of injecting the rubber material directly from the barrel into the model is rubber injection molding; plastic injection molding is the use of pressure to inject molten plastic into the plastic product mold, and cooling and molding to obtain various plastic parts; molding injection is generally directly the subsequent finished product . There are many types of injection mold processing through different combinations of molds and raw materials, which gives us more autonomy when choosing.

It is foreseeable that for a long period of time in the future, when the process is gradually updated, the molds used in injection mold processing will become larger and larger. After the diversification of molds has been developed by leaps and bounds, the demand for materials has also increased. Only when the materials/process methods/models are promoted simultaneously can the level of this industry be further improved, and the diversity of the product structure in industrial production can be fundamentally increased.