LIQUID PERMEATION RATE IN THE CAPILLARY FLOW THROUGH THE YARN

Abstract

This study was attempted to relate the liquid capillary flow through a yarn with its structural factors. The flow around a fiber was divided into several sections, and an appropriate distribution function of velocity in each section was assumed. The distributions of distances and angles between fibers were supposed to follow the Poisson distribution. The total flow was calculated by this model.
The samples used were low twist yarn and high twist yarn of poly (ethylene telephthalate). One end of the yarn was soaked into 5% aqueous NaCl solution and the rest of the yarn was placed horizontally between two press edges. The permeation rate of the salt solution was measured by contact pins embedded in the lower press edge at 5mm intervals. The load on the yarn ranged from 0.5 to 6.0kg/cm.
For the low twist yarn, the experimental total flow agreed well with that calculated from the total flux of all sections. For the high twist yarn, the value calculated from the average of each section agreed with the experimental one.