Injection Molding
4 조회수
PP Flash
문제 현상
Thin-sheet flash appears at the parting line and ejector pins, requiring manual trimming after demolding.
원인 분석
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.
해결 방법
①Reduce injection/holding pressure; ②calculate clamping force; ③appropriately lower melt temperature to raise viscosity; ④repair parting line and ejector pin fit clearances.
핵심 요약
For flash of low-viscosity materials, pressure restraint comes first.
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