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.

Void in Plastic Industry

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.