| 摘要 |
PURPOSE:To obtain hollow fiber, having an especially high percentage of hollowness, a low ratio of wall thickness of the hollow fiber, slits in the longitudinal direction of the fiber and especially better in heat insulating properties and reduction in weight than those of conventional products of the same material when formed into fabric. CONSTITUTION:The objective hollow fiber has slits, communicating with the hollow part and the outside on the fiber surface and formed continuously in the fiber axial direction and an average thickness of the hollow fiber of 0.025-0.225 based on the round equivalent diameter and the objective method for producing the fiber is provided. A material, unconventionally good in heat insulating properties and capable of reducing the weight can be provided by realizing a high percentage of hollowness. Furthermore, since a space in the fiber communicates through the fine slits with the open air, a material capable of improving the water absorbency can be provided. |
