Injection Molding
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PP Injection Part Weld Line Whitening
Fenómeno del problema
Obvious whitening at weld lines of PP parts.
Análisis de la causa
Low meeting front temperature; entrained gas and impurities enrich at the weld line; with poor venting the white line is more obvious.
Solución
①Raise melt and mold temperature; ②vent at the meeting point; ③set an overflow well; ④adjust the gate to change the meeting position.
Conclusión clave
White weld line = cold front + gas and impurity enrichment.
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