Molding Process
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EEA Surface Stress Whitening
Problem Phenomenon
Stress whitening on the surface of stressed areas of EEA products, affecting appearance and strength
Cause Analysis
Under local stress, EEA molecular orientation causes refractive index differences and whitening; internal stress concentration areas of the product
Solution
1) Reduce injection speed to reduce 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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