Molding Process
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Surface stress whitening of PU
Fenómeno do problema
Stress whitening on the surface of stressed areas of PU products, affecting appearance and strength
Análise das causas
PU molecular orientation under local stress causes refractive index difference and whitening; internal stress concentration areas of the product
Solução
1) Reduce injection speed to reduce orientation stress; 2) Annealing treatment at 80°C/2h to release stress; 3) Product design avoiding stress concentration sharp corners
Conclusão principal
Stress whitening is caused by orientation and internal stress; reducing orientation and annealing are key
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