Injection Molding Glossary

Mold

A hollow form or matrix for shaping a fluid or plastic substance. Injection molds have many holes drilled in the block for temperature control by means of hot water, oil or heaters. Molten plastic flows into a mold through a sprue and fills cavities by way of runners and gates.

Plastic

A natural or synthetic substance which is pliable or moldable at some stage during its forming or manufacturing.

Runner

Channels in the injection mold that connect the sprue with the various cavaties which molten plastic flows through.

Sprue
The hole through which molten material is chanelled into a mold.
The waste material filling or protruding from this hole after hardening.
The usually plastic rod or framework that secures molded objects, such as model parts or game pieces, before their first use.

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