Mold injection molding is a processing method used in mass production of some complex shapes. The specific principle refers to: the heated and melted plastic raw material is pushed by the screw of the injection molding machine into the cavity of the plastic mold under high pressure, and after cooling and solidification, the plastic molding product is obtained.

The plastic mold consists of a movable mold and a fixed mold. The movable mold is installed on the moving template of the injection molding machine, and the fixed mold is installed on the fixed template of the injection molding machine. During injection molding, the movable mold and the fixed mold are closed to form a gating system and a cavity. When the mold is opened, the movable mold and the fixed mold are separated to take out the plastic product.

Although the structure of the mold may vary due to the variety and performance of plastics, the shape and structure of plastic products, and the type of injection machine, the basic structure is the same. The mold is mainly composed of pouring system, temperature regulation system, forming parts and structural parts.