Molding Process
7 조회수
EVOH Surface Stress Whitening
문제 현상
Stress whitening on stressed areas of EVOH product surfaces, affecting appearance and strength
원인 분석
EVOH molecular orientation under local stress causes refractive index difference and whitening; areas of internal stress concentration in the product
해결 방법
1) Reduce injection speed to decrease orientation stress; 2) Anneal at 80°C/2h to release stress; 3) Product design to avoid stress-concentrating sharp corners
핵심 요약
Stress whitening is caused by orientation and internal stress; reducing orientation and annealing are key
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