| 摘要 |
PURPOSE:Two or more curved slits of specific dimensions are arranged annularly and polymers different in their viscosity are fed to the resultant spinning nozzles in sheath-core to effect melt spinning, thus producing hollow fiber with very big hollow degree good in spinnability. CONSTITUTION:Two or more slits of uniform slit width W, 0.05-0.15mm., radius R, 0.4-1.5mm., are circularly arranged so that the bridge length between the slits L is set to 0.1-0.5mm. and 2 kinds of polyester polymers 1, 2 different in melt viscosity by 200-600 poise from each other are introduced into the slits in the sheath-core conjugation so that the high-viscosity polymer 1 comes inside and the low-viscosity to the outside. Then, the melt-spinning is effected under such conditions as Q/L is over 3 where Q is the polymer throughput in g/min each nozzle and L is the bridge length.
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