In areas with thick walls and across from ribs, a “hole” in the inside might appear.
Mass accumulation leads to a higher volumetric shrinkage, which is not insufficiently adjusted by packing pressure.
The melt is pulled to the surface during cooling, that a hollow remains in the inside.
CT-Scan and cutting the part help to detect these errors.
Small wall thickness and higher packing pressure in the critical area reduce the risk of voids.
Injection Molding Error: The CT-Scan shows a void at the rib.
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This glossary of plastic industry is provided by PLEXPERT Canada Inc.
