Molding Process
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POM weld line weak strength
Problembeschreibung
Fracture at the weld line.
Ursachenanalyse
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.
Lösung
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.
Wichtigste Erkenntnis
POM weld lines = racing against crystallization speed.
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