Injection Molding
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PVDF '2079851475616104452 Pressure and Speed Staged Control
Problem Phenomenon
【Problem phenomenon】Single-stage high-speed injection of PVDF shows flash and bubbles coexisting, and pressure and speed trade one off against the other
Cause Analysis
PVDF should be injected at low-to-medium speed to prevent shear degradation, but thick-wall compensation requires 80-120MPa holding pressure; single-stage parameters cannot take care of both defect prevention and compensation; During on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience
Solution
Staged injection: slow filling at the initial stage to prevent shear and air entrapment, speed up in the middle and late stages and switch to 80-120MPa holding pressure for compensation; take low back pressure to prevent shear heat generation; adjust switchover points according to product structure
Key Takeaway
PVDF injection requires low-to-medium speed to prevent shear and high holding pressure for compensation; the staged profile is standard; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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