Material Drying
2 views
PVDF Bubbles Caused by Confusion of Drying Parameters
Problem Phenomenon
【Problem phenomenon】PVDF dried at 80-100℃ according to other materials still shows bubbles and silver streaks, and the inconsistent parameters leave one at a loss
Cause Analysis
Different sources give different parameters such as 80℃×4h, 80-100℃×2-4h, 120-150℃×2-4h; the commonality is that moisture must be reduced below 0.05%; when the temperature is insufficient or the time is not enough, residual moisture forms bubbles in the melt
Solution
Set drying parameters based on the resin supplier's data sheet, and accept moisture content below 0.05%; for thick-walled parts and appearance parts, strictly take the upper temperature limit; regularly calibrate the dryer's actual temperature and dew point
Key Takeaway
Drying parameters are based on the resin supplier, with 0.05% moisture content as the acceptance line; do not rely on online hearsay experience; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
Was this helpful?
0 people found this helpful
Thank you for your feedback!