Molding Process
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EVA surface stress whitening
Problem Phenomenon
Stress whitening appears on the surface of stressed areas of EVA products, affecting appearance and strength
Cause Analysis
Molecular orientation of EVA under local stress causes refractive index differences and whitening; areas of internal stress concentration in the product
Solution
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
Key Takeaway
Stress whitening is caused by orientation and internal stress; reducing orientation and annealing are key
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