Material Drying
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PMMA Dryer Dew Point Failure
Problem Phenomenon
Bubbles still appear after drying for the standard time; testing finds the dryer dew point is only -20℃.
Cause Analysis
The molecular sieve of the dehumidifying dryer is aged or poorly regenerated, and the dew point cannot reach the -40℃ requirement; no matter how long the drying time, it cannot compensate for insufficient dew point.; During on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based on experience alone.
Solution
①Test and restore dew point ≤-40℃; ②replace or regenerate the molecular sieve; ③regularly calibrate the dew point meter; ④monitor drying air flow.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Key Takeaway
Drying effect is determined by dew point, not by time alone; dew point monitoring should be included in equipment inspection items.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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