Molding Process
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MP surface stress whitening
Fenómeno do problema
MP product stressed regions show surface stress whitening, affecting appearance and strength
Análise das causas
MP under local stress, molecular orientation causes refractive index difference, whitening; product internal stress concentration regions
Solução
1) reduce injection speed to reduce orientation stress; 2) annealing at 80°C/2h to release stress; 3) product design avoiding stress-concentrating sharp corners
Conclusão principal
stress whitening is caused by orientation and internal stress; reducing orientation and annealing are key
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