Processing Machinery
3 조회수
PVC Sink Mark Holding Pressure
문제 현상
Sink marks in thick-wall areas were obvious; increasing holding pressure improved them but lengthened the cycle
원인 분석
Insufficient shrinkage compensation in PVC thick-wall areas forms sink marks; poor heat conduction makes thick walls solidify slowly, requiring long holding pressure; thinning the wall thickness design is more fundamental than process compensation; during on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience
해결 방법
①Increase holding pressure and time; ②thin the structure of thick-wall areas or core out material; ③place the gate near thick-wall areas; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
핵심 요약
Holding pressure is effective for PVC sink marks but treats the symptom; structural thinning is the root cure—use both in combination; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
이 정보가 도움이 되었나요?
0 명이 도움이 되었다고 합니다
의견 주셔서 감사합니다!