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Low pressure injection moulding
Low pressure injection moulding or structural foam injection (SFI) is the ideal technique for medium-sized series. In comparison with the classical high pressure injection moulding, this involves products with a slightly greater wall thickness. Aluminium moulds are used.
Low pressure injection moulding
Step 1:
As with the classical high pressure injection moulding, the plastic is heated in the screw and injected into the mould. With SFI this happens under a much lower pressure, however. Apart from the plastic, a blowing agent is injected as well.
Step 2:
The mould is filled for 90 to 95% with this plastic. The blowing agent ensures the frothing of the plastic so that the mould gets filled completely.
Step 3:
When it has cooled down, the mould opens and the product is removed.
