Molding Process
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PVA surface stress whitening
Problem Phenomenon
PVA product stressed areas show surface stress whitening affecting appearance and strength
Cause Analysis
Under local stress, PVA molecular orientation causes refractive index difference and whitening; product internal stress concentration areas
Solution
1) Reduce injection speed to reduce orientation stress; 2) Annealing treatment 80°C/2h to release stress; 3) Product design to avoid stress concentration sharp corners
Key Takeaway
Stress whitening is caused by orientation and internal stress; reducing orientation and annealing are the key
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