Injection Molding defect:molding high volumetric shrinkage

Solving molding high volumetric shrinkage problems
Volumetric shrinkage is the contraction of polymer due to the change in temperature from melt temperature to ambient temperature.
High volumetric shrinkage can cause part warpage, sink marks, critical dimensions that are too small, and internal voids.
Excessive wall thickness and inadequate packing can both contribute to high volumetric shrinkage in a part.
The key result to use to identify high volumetric shrinkage are the shrinkage results.
To reduce volumetric shrinkage, you can alter:
Part design (wall thickness)
Mold design (gate positions)
Processing conditions (increase packing pressure)