Extrusion & Post
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PAN fiber uneven fineness
Problem Phenomenon
The fineness of the spun PAN filaments fluctuates greatly along the length direction and between tows
Cause Analysis
Metering pump output pressure fluctuates; spinneret holes have differences; coagulation and drawing conditions uneven
Solution
Use a high-precision metering pump; regularly check the flow of each spinneret hole; stabilize the coagulation and drawing process
Key Takeaway
Fineness uniformity is a basic requirement for high-performance carbon fiber
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