Plastic injection molding is a production procedure whereby the molten thermoplastic material is injected into the relatively cool cavity to create an article of the desired shape. Plastic injection molding is a manufacturing technique for making custom size plastic packaging boxes or parts from plastic material. Molten plastic is forced, at high pressure, into a mold cavity which is in the inverse shape of the desired product. The process of plastic injection molding An injection molding machine generally consists of four basic parts: the clamping and ejecting unit, the injection unit, the electric driving unit and the hydraulic control unit. During the injection phase, raw plastic material, usually in the form of granules, are loaded into a hopper on top of the injection unit. The plastic fluid is forced into the mold through a gate, while the screw controls the pressure and speed.