Injection Molding
6 مشاهدة
PP Flash
ظاهرة المشكلة
Thin-sheet flash appears at the parting line and ejector pins, requiring manual trimming after demolding.
تحليل الأسباب
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.
الحل
①Reduce injection/holding pressure; ②calculate clamping force; ③appropriately lower melt temperature to raise viscosity; ④repair parting line and ejector pin fit clearances.
الخلاصة الأساسية
For flash of low-viscosity materials, pressure restraint comes first.
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