Newcomers to the world of plastic injection moulding are often met with a whole new vocabulary that can seem quite confusing and intimidating at times. That’s why we’ve compiled this three-part post of some of the more common terms to help ease some of that uncertainty.

Welcome to Part 2 of our post, where we look at some of the terms from C through to D

Clamp

The part of the injection moulding machine that holds the part in place during the injection moulding process.

Cold slug

The first material to enter an injection mould. It’s called a cold slug because as it passes through the spruce orifice it is cooled below the effective moulding temperature.

Colourant

A plastic compound which contains a high percentage of pigments, which is mixed in with the base resin to change the colour of the part/product.

Cycle

This refers to the complete repeating sequence of operations required for injection moulding a part.

Degassing

The momentary opening and closing of a mould during the early stages of the cycle to permit the escape of air or gas from the heated compound.

Delamination

This occurs when the surface of a finished part separates. Strata or a fish-scale-type appearance may be visible where the layers are separated.

Density

Weight per unit volume of a substance.

Differential cooling

This occurs when one area of the part cools at a different rate or when the mould is surfaces are at different temperatures.

Dimensional stability

This refers to the ability of a plastic part to retain the precise shape in which it was moulded.

Click here to read Part 3.

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