Molding Process
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POM weld line weak strength
Fenómeno do problema
Fracture at the weld line.
Análise das causas
POM crystallizes extremely fast, the melt fronts freeze quickly where they meet, and the molecular entanglement window is extremely short; cold fronts inevitably produce weak weld lines.
Solução
①Increase melt temperature (still must be <230℃) or mold temperature; ②increase injection speed; ③adjust the gate so the weld line avoids the stressed area; ④vent at the meeting point.
Conclusão principal
POM weld lines = racing against crystallization speed.
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