Molds & Tooling
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POM trapped air burning
Fenómeno del problema
Black spots and burn marks at the end of the cavity and at weld lines.
Análisis de la causa
POM crystallizes quickly and fills quickly, so trapped air is compressed, heats up, and burns; POM decomposition gas release aggravates it.
Solución
①Open/clean vent grooves; ②decelerate at the end; ③control melt temperature to prevent decomposition; ④audit venting capacity.
Conclusión clave
Burning = check both venting and temperature.
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