Injection Molding
11 조회수
Large shrinkage rate fluctuation of PET injection parts
문제 현상
Unstable dimensions of PET injection products, shrinkage rate fluctuates between 0.2%-0.8%, affecting assembly accuracy.
원인 분석
Insufficient holding pressure and holding time, mold temperature fluctuation causes crystallinity differences, uneven cooling rate, material IV value differences.
해결 방법
Increase holding pressure to 60-80% of injection pressure, extend holding until gate solidification; stabilize mold temperature ±2°C; control IV value 0.75-0.85dL/g.
핵심 요약
PET shrinkage rate is dominated by crystallinity and holding pressure; process stability is the guarantee of dimensional accuracy.
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