Plastic Injection Molding is a manufacturing process

Plastic Injection Molding is a mass manufacturing process used for the production of plastic parts. It is a highly productive process and has many advantages over other forms of molding such as CNC machining.It is used to manufacture large, voluminous plastic products in a short time frame. It is also capable of producing parts with dimensional consistency that ensures that they are similar in shape and size.

The process involves the injection of molten plastic into the cavities of a custom designed mould tool. The injected plastic is allowed to settle and solidify over the mold tooling at relatively low pressures and temperatures.There are a variety of plastics that can be used for this application, but most plastics are thermoplastics. These materials can be remelted repeatedly to produce new parts.

Injection is carried out by a machine which uses a reciprocating screw and a barrel to convey and pressurize the plastic pellets. The barrel is wrapped in several heater bands to provide thermal energy for the plastic granules.When the right dosage of melted plastic is conveyed to the front of the screw, it is injected into the mold. The injection system is controlled by a non-return valve to prevent the backflow of molten plastic.

The injection pressure is applied to force the molten plastic into the cavity until it is 95% filled. The injection speed depends on the flow characteristics of the molten plastic and is determined by the part volume required for the molding cycle.