Molding Process
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EAA surface stress whitening
Problem Phenomenon
Stress whitening on the surface of stressed areas of EAA products affecting appearance and strength
Cause Analysis
EAA molecular orientation under local stress causing refractive index difference and whitening; areas of internal stress concentration in the product
Solution
1) Reduce injection speed to reduce orientation stress; 2) Anneal 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 the key
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