FIBER AND PROCESS FOR PRODUCING THE SAME

摘要

A fiber characterized by comprising: a core resin layer having voids in inner parts thereof and having an almost circular section perpendicular to the lengthwise direction; and one or more resin layers formed on the core resin layer and having an almost annular section perpendicular to the lengthwise direction. It is preferable that with respect to directions perpendicular to the lengthwise direction for the core resin layer, the proportion of the sectional area of the voids (Y, µm2) to the sectional area of the fiber (X, µm2), Y/X, be 5-40% on the average. When the average dimension of the voids in a diameter direction perpendicular to the direction of orientation for the voids is expressed by r (µm) and the average dimension of the voids in the direction of orientation for the voids is expressed by L (µm), then the L/r ratio is preferably 10-100.