Material Drying
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PVDF Insufficient Drying Bubbles
Problem Phenomenon
Bubbles inside the product and silver streaks on the surface.
Cause Analysis
Moisture adsorbed on the surface of PVDF pellets vaporizes at high temperature; although PVDF has low hygroscopicity, the high processing temperature allows even trace moisture to form defects.; During on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience
Solution
①Dry at 80~100℃ for 2~3 hours; ②store sealed to prevent moisture absorption; ③use promptly after drying; ④test the moisture content.; After adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PVDF drying requirements are relatively mild but cannot be omitted; high-temperature processing keeps moisture management important.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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