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The characteristic of plastic injection mold and molding is that the plastic raw material is placed in the heating barrel of the injection molding machine. The plastic is melted by heat, driven by the screw or plunger of the injection molding machine, enters the mold cavity through the nozzle and the pouring system of the mold, and the plastic is formed by heat preservation, pressure retention, and cooling in the mold cavity. Since the heating and pressing device can function in stages, injection molding can not only form plastic parts with complex shapes, but also has high production efficiency and good quality. Therefore, the injection mold occupies more than half of the proportion in the molding of plastic parts. Injection molding machines are mainly used for the molding of thermoplastics, and in recent years have gradually been used for the molding of thermoset plastics.

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