Material Drying
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PVDF Insufficient Drying Bubbles
Fenómeno del problema
Bubbles inside the product and silver streaks on the surface.
Análisis de la causa
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
Solución
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
Conclusión clave
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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