| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for effectively producing carbon fibers from acrylic fiber tows, by which fibers are drawn up without causing folding, torsion (twisting), nonuniformity in thickness in a process producing the carbon fiber, and preventing thread breakage in calcination process or winding of fluff. SOLUTION: The method for producing carbon fiber by vertically drawing the acrylic fiber tows traversely contained in a container and feeding the tows to the calcination process through a tow arranging guide, wherein a tensioning means which applies tension further in addition to tare is disposed between the container and the tow arranging guide. The tension f (g) further added to the acrylic fiber tows is set in a range represented by formula (1) : F×5.0×10<SP>-6</SP>≤f≤äF×(Y-700)/99}×10<SP>-5</SP>, where F (dtex) denotes total fineness of the acrylic fiber tows, and Y (mm) denotes the vertical drawing height from the tensioning means to the tow arranging guide. COPYRIGHT: (C)2007,JPO&INPIT
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