Injection Molding
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PVDF '2079851475616104452 Low Melt Temperature Filling Difficulty
Problem Phenomenon
【Problem phenomenon】When the PVDF melt temperature is below 190℃, the viscosity rises sharply, and thin-wall flow paths are underfilled with short shots
Cause Analysis
PVDF's melting point is 170-175℃; when the melt temperature is below 190℃, the viscosity rises sharply and flowability is insufficient; below the lower limit of the recommended window, raising pressure and speed can hardly compensate for viscosity
Solution
Gradually raise the melt temperature into the 200-270℃ window, increasing 5℃ each time to find the sweet spot; take 240-250℃ for thick-walled corrosion-resistant parts to balance filling and thermal safety; recheck runner and gate sizes
Key Takeaway
PVDF viscosity below 190℃ is hard to remedy; getting the melt temperature into the window is the prerequisite for filling; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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