Molding Process
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EVOH Surface Stress Whitening
Problembeschreibung
Stress whitening on stressed areas of EVOH product surfaces, affecting appearance and strength
Ursachenanalyse
EVOH molecular orientation under local stress causes refractive index difference and whitening; areas of internal stress concentration in the product
Lösung
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
Wichtigste Erkenntnis
Stress whitening is caused by orientation and internal stress; reducing orientation and annealing are key
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