Injection Molding
15 visualizaciones
Post-shrinkage of PBT injection molded parts
Fenómeno del problema
PBT products continue to shrink after demolding, the size keeps changing, affecting assembly accuracy.
Análisis de la causa
PBT cools quickly in the mold and crystallization is incomplete; after demolding, crystallization continues at ambient temperature (post-crystallization), accompanied by volume shrinkage.
Solución
Ensure the mold temperature is high enough (80-120°C) for sufficient crystallization; extend the cooling time; anneal at 120°C/1-2h after molding.
Conclusión clave
The root cause of PBT post-shrinkage is incomplete crystallization; mold temperature and annealing are the control means.
¿Le ha resultado útil?
0 personas encontraron esto útil
¡Gracias por sus comentarios!