Injection Molding
6 조회수
PP Injection Part Sink Mark—Freeze-off Type
문제 현상
Although the gate is small and holding time is already long, thick walls still have sink marks.
원인 분석
The small gate freezes off early, and holding pressure cannot continue to transmit to thick-wall areas; no matter how long the holding time, it is ineffective.
해결 방법
①Enlarge the gate to delay freeze-off; ②place the gate near thick-wall areas; ③reduce material at thick walls; ④auxiliary gates if necessary.
핵심 요약
Holding after freeze-off = ineffective feeding—the gate is the key.
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