Injection Molding
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PVDF '2079851475616104452 Flash and Clamping Verification
Fenómeno del problema
【Problem Phenomenon】PVDF thin-wall parts have flash at the parting line, and short shot reappears after reducing pressure, with an extremely narrow window
Análisis de la causa
PVDF melt viscosity varies greatly with temperature; the superposition of high injection pressure demand and insufficient clamping margin narrows the process window; after mold wear, the flash threshold moves further down
Solución
Calculate the match between projected area and clamping force and leave margin; repair parting line wear; use a staged injection curve to find balance between preventing flash and ensuring filling; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Conclusión clave
The coexistence of flash and short shot is a narrow window signal; check clamping and mold condition first; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent similar problems
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