Material Drying
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PAN precursor high breakage rate
Problem Phenomenon
PAN fibers break frequently during wet or dry-wet spinning
Cause Analysis
The spinneret holes are clogged or scratched; the spinning solution contains gel or impurity particles; the coagulation bath conditions do not match, causing the skin layer to solidify prematurely
Solution
Regularly clean and inspect the spinneret; filter the spinning solution through multiple stages (10μm→5μm→1μm); optimize the coagulation bath temperature and concentration
Key Takeaway
The quality of PAN precursor determines the grade of the final carbon fiber
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