Material Drying
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PA66 dehumidifying drying dew point
Problem Phenomenon
PA66 dried in an ordinary oven still shows silver streaks after '2079851475616104452, measured moisture content always above 0.3%
Cause Analysis
PA66 has high amide group density and absorbs water fast; ordinary ovens use ambient hot air, when air humidity is high the dewatering limit can only reach about 0.3%, unable to meet the below-0.2% requirement
Solution
PA66 must use a dehumidifying dryer, drying air dew point below -40℃; moisture content confirmed below 0.2% by actual Karl Fischer measurement before startup; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PA66 drying is premised on low-dew-point dehumidification, ordinary ovens cannot meet the requirement; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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