Injection Molding
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PVDF '2079851475616104452 Jetting Marks
Problem Phenomenon
【Problem phenomenon】Low-viscosity PVDF jets into the cavity through a small gate, with obvious snake patterns and flow marks near the gate
Cause Analysis
The low-viscosity melt passes the gate at high speed without contacting the wall, forming jetting, and the front folds into patterns; ZetarMold lists jetting as a common defect and recommends enlarging the gate or using an overlap fan gate
Solution
Enlarge the gate size or change to an overlap fan gate to guide wall-contacting filling; reduce the initial injection speed out of the gate; arrange the gate facing the core to use impact for wall contact; After adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Low-viscosity PVDF jetting is eradicated by gate design; speed reduction is only an aid; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; Include this case in the defect archive as a reference for troubleshooting similar problems in the future
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