Voids

An empty space (vacuum), often spherical or sausage-shaped, in the centre of the
thickest part of the moulding.

Some possible causes:
Outward shrinkage, i.e. due to the hard outer surface of the component it cannot
‘ink’inwards therefore a void is formed inside the component, where the material is
still soft.

Remedies, to check:
a. Follow-up pressure - may need to be increased.
b. Follow-up pressure time - increase.
c. Mould temperature - may be too low.
d. Melt temperature - may be too high.
e. Gate - may be too small.


                                 Void