Molding Process
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Surface stress whitening of PU
Problembeschreibung
Stress whitening on the surface of stressed areas of PU products, affecting appearance and strength
Ursachenanalyse
PU molecular orientation under local stress causes refractive index difference and whitening; internal stress concentration areas of the product
Lösung
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
Wichtigste Erkenntnis
Stress whitening is caused by orientation and internal stress; reducing orientation and annealing are key
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