Molding Process
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PAN pre-oxidation process exotherm out of control
Problem Phenomenon
During pre-oxidation, the internal temperature of the fiber bundle rises sharply, causing the fibers to fuse or burn
Cause Analysis
PAN pre-oxidation is an exothermic reaction (cyclization reaction releases heat); the oxidation oven temperature is too high or the residence time is too long; the fiber bundle is too thick and heat dissipation is poor
Solution
Step heating (200→230→250→280°C); control the residence time and tow density of the fiber bundle in the oven; forced air circulation to remove reaction heat
Key Takeaway
Pre-oxidation exotherm control is the process safety key in carbon fiber manufacturing
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