Material Drying
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PAN solvent residue affecting carbonization
Problem Phenomenon
Residual solvent in PAN precursor volatilizes during carbonization, causing pores
Cause Analysis
Insufficient water washing after coagulation; incomplete solvent volatilization during drying
Solution
Increase the number of water washing stages and temperature (stepwise heating water washing); extend drying time and increase temperature; test residual liquid content <0.1%
Key Takeaway
Solvent residue is an important source of carbon fiber defects
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