Injection Molding produces plastic parts by forcing molten material into a mold where it cools and hardens. The molded shape produced is a reverse image of the mold tool. Injection Molding is low cost for simple and complex parts. Tooling adds to the initial cost but is quickly amortized.

With injection molding, granular plastic is fed by gravity from a hopper into a heated barrel. As the granules are slowly moved forward by a screw-type plunger, the plastic is forced into a heating chamber, where it is melted. As the plunger advances, the melted plastic is forced through a nozzle that rests against the mold, allowing it to enter the mold cavity. The mold remains cold so the plastic solidifies almost as soon as the mold is filled.

Injection Molding is an extremely versatile process for producing a wide range of simple or complex plastic parts - economically and with a good finish. Injection Molding's efficiency varies by the number of parts you plan to produce. For small quantities it is usually less expensive to simply machine the desired parts.