Molds & Tooling
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POM trapped air burning
Problem Phenomenon
Black spots and burn marks at the end of the cavity and at weld lines.
Cause Analysis
POM crystallizes quickly and fills quickly, so trapped air is compressed, heats up, and burns; POM decomposition gas release aggravates it.
Solution
①Open/clean vent grooves; ②decelerate at the end; ③control melt temperature to prevent decomposition; ④audit venting capacity.
Key Takeaway
Burning = check both venting and temperature.
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