Extrusion & Post
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PAN fiber fracture during drawing
Problem Phenomenon
Fibers break during steam drawing or hot drawing
Cause Analysis
Drawing temperature too low, PAN molecular chain mobility insufficient; draw ratio too large exceeding the drawing limit
Solution
Appropriately increase the drawing temperature (steam 100-120°C or dry heat drawing); draw in multiple stages to gradually increase the draw ratio
Key Takeaway
PAN drawing is the key to improving carbon fiber orientation and strength
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