Injection Molding
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PVDF '2079851475616104452 Warpage
Fenómeno do problema
【Problem phenomenon】PVDF sheets and thin-walled parts warp and twist after demolding, and assembly accuracy fails to meet requirements
Análise das causas
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
Solução
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
Conclusão principal
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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