If the air can’t escape, it will be compressed by the melt.
This leads to an increase in temperature and builds burn marks (black marks on the polymer).
A better venting or slower injection at lower temperatures can solve this issue in most cases.

Burn Mark in Plastic Industry

Injection Molding Error: A burn mark at the end of the flow front

Related topics:

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