In injection molding the shrinkage can be equalized by using a shrinkage value.
The warpage is minimized, if possible, by fiber orientation, ribs and cooling system layout.
Dependent on the geometry the dimensions of a part might not reach the requested tolerances due to part warpage.
In this case tool adaption is necessary.
The cavity will be engineered with a dimension that points to the opposite direction (black arrow) of the predicted warpage (blue color) (scale factor of -1 in simulation software).
If the information for the cavity modification is based on simulation results it is important to check that the tool adaption lead to a is still demouldable part.
With the new warpage after injection molding, the part should reach the requested dimensions.

Tool Adaption in Plastic Industry

Simulations: Left: part warpage; right: tool adaption.

Related topics:
Reverse Engineering

This glossary of plastic industry is provided by PLEXPERT Canada Inc.
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