Injection Molding
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PP Flash
Fenómeno do problema
Thin-sheet flash appears at the parting line and ejector pins, requiring manual trimming after demolding.
Análise das causas
PP melt has low viscosity and good flowability, easily penetrating parting line gaps under high pressure; excessive injection pressure, insufficient clamping, and parting line wear all cause it.
Solução
①Reduce injection/holding pressure; ②calculate clamping force; ③appropriately lower melt temperature to raise viscosity; ④repair parting line and ejector pin fit clearances.
Conclusão principal
For flash of low-viscosity materials, pressure restraint comes first.
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