Molding Process
4 visualizaciones
Surface stress whitening of PU
Fenómeno del problema
Stress whitening on the surface of stressed areas of PU products, affecting appearance and strength
Análisis de la causa
PU molecular orientation under local stress causes refractive index difference and whitening; internal stress concentration areas of the product
Solución
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
Conclusión clave
Stress whitening is caused by orientation and internal stress; reducing orientation and annealing are key
¿Le ha resultado útil?
0 personas encontraron esto útil
¡Gracias por sus comentarios!