| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for spinning by which the occurrence of the Barus effect at the time of discharging a polymer is suppressed to suppress accumulation of foulings in surroundings of discharging holes without causing yarn breakage even at the time of spinning a fibers of a fine single filament fineness and a fiber of a high evenness without dispersion among single filaments can stably be obtained with good operating efficiency. SOLUTION: When melt spinning a synthetic fiber having 30-80 denier total fineness and 0.5-1.5 denier single filament fineness, each spinning hole of a spinneret comprises an introduction hole 1, a capillary 2 and a discharging hole 3 from the upstream side and the narrowing angle from the introduction hole 1 to the capillary 2 is <=60 deg. to satisfy the following formula (1) and (2). Furthermore, the value of draft(DF) represented by the ratio of the takeoff speed to the discharging linear velocity satisfies the following formula (3). DB/D<=5 (1) L/D>=5 (2) 500<=DF<=1,500 (3) [DB is the introduction hole diameter (mm); D is the capillary diameter (mm); L is the capillary length (mm)].
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