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Manufacturing Process Selection Handbook by J. D. Booker, K. G. Swift

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Chapter 5

Plastics and Composites Processing

5.1 Injection Moulding

Process Description

Granules of polymer material are heated and then forced under pressure using a screw into the die cavity. On cooling, a rigid part or tree of parts is produced (Figure 5.1(a)).

image

Figure 5.1(a) Injection Moulding.

Materials

Mostly thermoplastics, but thermosets, composites and elastomers can be processed.

Process Variations

• Injection blow moulding: allows small hollow parts with intricate neck detail to be produced.

• Co-injection: for products with rigid cores pre-placed in the die before injection or simultaneous injection of different materials into the ...

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