Injection Molding
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PVDF '2079851475616104452 Flash and Clamping Verification
Problem Phenomenon
【Problem Phenomenon】PVDF thin-wall parts have flash at the parting line, and short shot reappears after reducing pressure, with an extremely narrow window
Cause Analysis
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
Solution
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
Key Takeaway
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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