The Injection Molding Process

Thermoplastic injection molding is a process, which uses temperature, high pressures, and speeds to create three-dimensional plastic parts.  The polymer is melted using a reciprocating screw inside a hot barrel.  A shot (a volume of melted plastic) is built-up, the screw stops rotating, the mold (typically steel) is closed, and the shot is pushed into the mold.   The screw stays forward until the gate solidifies and then another shot is created.  Once the part cools, the mold opens, and the part is ejected.  The cycle repeats.

 Examples of products created by this process are computer housings, luer fittings, car panels, pen housings, milk crates, and many others.

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