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Injection Moulding
Freedom of design
Injection moulding is a design technique frequently used for thermoplastics and, to a lesser degree, for thermosets and rubbers.
Injection moulding offers a number of significant advantages:
- A free hand with regard to product design.
- High reproducibility within limited tolerances.
- Various techniques can be integrated into the process, obviating the need for finishing or assembly (in-mould labelling, injection moulding of two or more components, insert and outsert technology).
Operation
When injection-moulding thermoplastics, a fluid mass is injected under high pressure into a cast – the mould. The mass then cools off and is ejected or removed.
Two items are needed for injection moulding: an injection moulding machine and a mould.
The injection moulding machine melts the raw material and injects it under high pressure into the mould. The mould consists of a mould cavity surrounded by technical appliances for cooling and ejecting the product.
Given that the manufacturing costs for moulds are high, injection moulding technology is usually only used for relatively large quantities (at least 2,000 per year).
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