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