Material Drying
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PEI Drying Equipment Requirements
Problem Phenomenon
After PEI is processed with ordinary drying equipment, the moisture still exceeds the standard; drying efficiency is low and drying quality is unstable between batches.
Cause Analysis
PEI recommends using a closed dehumidifying hot-air circulating hopper dryer with an aftercooler; the air dew point at the hopper inlet should be between -29℃ and -40℃ or lower; the equipment grade directly determines the drying effect.
Solution
①Configure a closed dehumidifying dryer with an aftercooler; ②verify the dew point at -29~-40℃ or lower; ③execute drying temperature and time according to the grade; ④regularly test the dew point and equipment performance.
Key Takeaway
The dew point indicator of PEI drying equipment is a hard constraint; the closed design with aftercooler is the standard configuration; equipment performance is verified regularly.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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