Injection Molding
3 조회수
Sink marks in PU '2079851475616104452
문제 현상
Sink marks of 0.2-0.5mm surface depressions in thick-walled areas of PU injection molded products
원인 분석
Holding pressure insufficient or holding time short; gate freezes too early so holding pressure cannot be transmitted; large wall thickness difference, after thin wall freezes, thick wall cannot be fed
해결 방법
1) Increase holding pressure to 70-90MPa; 2) Extend holding until gate freezing +2s; 3) Product design reduces wall thickness differences with gradual transition; 4) Add supplementary gates in thick-walled areas
핵심 요약
Sinking is caused by insufficient holding pressure and wall thickness differences; high holding pressure and multiple gates are the core countermeasures
이 정보가 도움이 되었나요?
0 명이 도움이 되었다고 합니다
의견 주셔서 감사합니다!