Injection Molding
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PP Injection Part Weld Line Whitening
Problembeschreibung
Obvious whitening at weld lines of PP parts.
Ursachenanalyse
Low meeting front temperature; entrained gas and impurities enrich at the weld line; with poor venting the white line is more obvious.
Lösung
①Raise melt and mold temperature; ②vent at the meeting point; ③set an overflow well; ④adjust the gate to change the meeting position.
Wichtigste Erkenntnis
White weld line = cold front + gas and impurity enrichment.
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