Injection Molding
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PVDF '2079851475616104452 Warpage
Fenómeno del problema
【Problem phenomenon】PVDF sheets and thin-walled parts warp and twist after demolding, and assembly accuracy fails to meet requirements
Análisis de la causa
Uneven mold temperature distribution, inconsistent cooling, and internal stress release jointly cause warpage; crystallinity differences in semi-crystalline materials amplify the warpage tendency; During on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience
Solución
Balance mold temperature distribution and optimize cooling water channels; symmetric design of thick-walled ribs; anneal at 80-120℃ after molding to release internal stress; symmetric holding pressure in the process to reduce residual stress
Conclusión clave
The main causes of PVDF warpage are uneven mold temperature and internal stress; annealing is the follow-up measure to stabilize dimensions; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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