Injection molding is a manufacturing process for creating custom parts by injecting material into a mold. It can be achieved with a host of materials, including metals, glasses, elastomers, confections, as well as thermoplastic and thermosetting polymers. First, the material for the part is put into a heated barrel, mixed, and then output into a mold cavity where it cools and hardens to the configuration of the mold. Molds are made by a moldmaker from either steel or aluminum. Injection molding is commonly utilized for manufacturing a variety of parts, from the smallest components to entire body panels of cars. In the case of plastics being molded, pellets of raw material are put into a hopper into a heated barrel with a reciprocating screw. Once the raw material enters, the heat increases and the Van der Waals forces that resist relative flow of individual chains are weakened as a result of increased space between molecules at higher thermal energy states. This makes the plastic malleable and able to take on the shape of its mold.
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