Material Drying
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Improper PEI Drying Temperature
Problem Phenomenon
When drying PEI, too low a temperature does not remove water thoroughly, and too high a temperature (>160℃) causes surface pre-crosslinking; both ends produce processing defects.
Cause Analysis
The PEI drying temperature window has bidirectional constraints: below 110℃ water cannot be effectively removed, and above 160℃ surface pre-crosslinking easily occurs; the base grade ULTEM 1000 uses 120~130℃, and glass fiber reinforced grades need to be increased to 130~150℃ due to poor thermal conductivity.
Solution
①Select the drying temperature by grade: base grade 120~130℃, reinforced grade 130~150℃; ②strictly prohibit exceeding 160℃ to prevent pre-crosslinking; ③use a dehumidifying dryer to avoid secondary moisture absorption of ordinary ovens; ④adjust the drying time of 4~8 hours according to verification.
Key Takeaway
PEI drying temperature is narrow-window management; pre-crosslinking is a specific failure of excessive high temperature; grade-differentiated settings cannot be one-size-fits-all.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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