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Injection-Compression Moulding

The injection-compression moulding process combines elements of both the injection moulding process and the compression moulding process.
Compared with injection moulding, there is a big reduction in the filling pressures required. There is also less orientation of the material, which can improve properties and reduce anisotropy. This can be of special importance in moulding thin-walled components where dimensional stability is important, and with transparent mouldings where good optical properties are required. Figure 1.18 shows the formation of an injection-compression moulded product. A pre-set amount of material is injected into a partly closed mould (a). The mould then closes to the size of the desired final

component, squeezing the material by compression to complete cavity filling (Figure 1.18b).

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