Injection molding is a plastic thermo-physical properties of the material from the hopper into the barrel, the barrel outer ring heated by the heating, the material is melted in a cylinder that has the power under the external action of a Plastic injection mold makers rotating screw, the role of the material in the screw down along the groove forward transport and compaction, the material is heated and a screw cut out the dual role gradually plasticized, melted and homogenized, when the screw is rotated, the material groove friction and shear forces in the the role, the molten material onto the screw head, at the same time, the screw at the back reaction material, the screw head forming material storage space, complete plasticizing process, then screw in the injection cylinder piston thrust after the next action, high speed, high pressure, the material storage chamber through a nozzle melt injected into the MASTER plastic molding factory , the cavity in the melt through packing, cooling, curing stereotypes, the role of mold clamping mechanism open mold, and top of the device by setting a good product from the mold to the top of the falls.