Injection Molding
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PVDF '2079851475616104452 Short Shot and Flow Balance
Problem Phenomenon
【Problem Phenomenon】In PVDF multi-cavity products, end cavities have short shots, and flash appears again after only raising the temperature
Cause Analysis
PVDF viscosity is sensitive to temperature but the window is limited; when runners are unbalanced, end pressure is insufficient causing short shot; blindly raising the temperature causes overfilling flash at the near end; during on-site troubleshooting, verify item by item according to this mechanism, avoiding blind machine adjustment based solely on experience
Solution
First perform runner balance analysis and short shot test to locate the problem; correct runner size differences; fine-tune the temperature within the window and coordinate with injection speed curve optimization; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
For multi-cavity short shot, balance the runners first before discussing temperature; raising the temperature treats the symptoms not the root cause; 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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