Molding Process
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PVA surface stress whitening
Fenómeno do problema
PVA product stressed areas show surface stress whitening affecting appearance and strength
Análise das causas
Under local stress, PVA molecular orientation causes refractive index difference and whitening; product internal stress concentration areas
Solução
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
Conclusão principal
Stress whitening is caused by orientation and internal stress; reducing orientation and annealing are the key
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