Molds & Tooling
4 조회수
POM Sink Mark Depression
문제 현상
Sink mark pits on the part surface, especially obvious behind ribs, still remaining after holding pressure adjustment
원인 분석
POM's high crystallization shrinkage makes sink mark risk high; insufficient holding pressure, gate position far from thick-walled areas, and excessive mold temperature all aggravate it; behind ribs is a high-incidence location for sink marks; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
해결 방법
①Increase injection pressure and screw forward time; ②move the gate to the thick-walled area; ③appropriately lower mold temperature and modify part design to thin the ribs; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
핵심 요약
POM sink mark control prioritizes holding pressure with structure as backstop; gate position and rib design are the fundamental countermeasures on the mold side; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
이 정보가 도움이 되었나요?
0 명이 도움이 되었다고 합니다
의견 주셔서 감사합니다!