Material Drying
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PA6 Dehumidifying Dryer Selection
Problem Phenomenon
PA6 '2079851475616104452 dried in an ordinary hot-air oven still shows silver streaks and bubbles; after switching to a dehumidifying dryer, the defects disappear
Cause Analysis
PA6 is highly hygroscopic with a high equilibrium moisture content; ordinary hot-air ovens rely on heating ambient air, and when the air humidity is high, the moisture content cannot be reduced below 0.2%; only a dehumidifying dryer providing low-dew-point dry air can achieve deep dehydration
Solution
Where a moisture content below 0.2% is required, a dehumidifying dryer must be selected, requiring a dew point below -40°C; hot-air ovens are only suitable for preliminary pre-drying in dry ambient seasons and cannot be used as a formal drying means
Key Takeaway
The core of PA6 drying equipment selection is the dew point rather than the temperature, and the dehumidifying dryer is the standard configuration; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence
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