Molding Process
6 조회수
EVA surface stress whitening
문제 현상
Stress whitening appears on the surface of stressed areas of EVA products, affecting appearance and strength
원인 분석
Molecular orientation of EVA under local stress causes refractive index differences and whitening; areas of internal stress concentration in the product
해결 방법
1) Reduce injection speed to decrease orientation stress; 2) Annealing treatment 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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