Material Drying
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PA66 drying equipment selection
Problem Phenomenon
Using an ordinary hot air dryer to process PA66, drying time extended yet still cannot reach moisture content requirements
Cause Analysis
Ordinary hot air drying heats ambient humid air and blows it over the pellets; in wet seasons the inlet air itself has high moisture, dewatering efficiency is extremely low or even gets wetter the longer it dries; only a dehumidifying dryer with dew point below -30℃ can stably meet the standard
Solution
①Must use a dehumidifying dryer with molecular sieve, dew point <-30℃; ②return air filtered to prevent dust contamination; ③regularly calibrate dew point meter and temperature control accuracy; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Equipment selection determines the lower limit of PA66 drying; dehumidifying dryers are a must-have configuration, ordinary hot air drying equals no drying in wet seasons; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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