| 摘要 |
PROBLEM TO BE SOLVED: To obtain an acrylic filament yarn excellent in processability while steam-drawing, etc., and useful for a precursor of carbon fibers, by specifying the index number of moving thread breath. SOLUTION: The purpose of this invention is accomplished by making the index number of moving thread breath (K) of an acrylic filament yarn be <95, preferably <90, where the index number of moving thread breath K is shown by the formula K=Wmin×100/Wmax [Wmax (mm) is the maximum thread breath and Wmin (mm) is the minimum thread breath when the yarn is made to move around rollers for two minutes by the contact angle of 4π]. The yarn A can be passed through a steam pressure apparatus B via feeding rollers 8 and can be draw with good processability with the drawing roller 9.
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