Molding Process
8 görüntüleme
EVOH Surface Stress Whitening
Sorun Belirtisi
Stress whitening on stressed areas of EVOH product surfaces, affecting appearance and strength
Neden Analizi
EVOH molecular orientation under local stress causes refractive index difference and whitening; areas of internal stress concentration in the product
Çözüm
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
Temel Çıkarım
Stress whitening is caused by orientation and internal stress; reducing orientation and annealing are key
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