Twist Set of Wool Fibers Bundle (A Fundamental Study on Set of Wool Fabric)

Abstract

It was found that twist set of wool fibers bundle was a convenient method for determining set of wool fibers which is an important theme of study on sets of wool fabric . This method gives reproducible values to measuring sets of wool fibers under small deformations which correspond better to deformations of wool fibers in wool fabrics than a conventional method which determines sets under larger deformations like thirty percent or more stretches.The relation illustrated in equation (I) was found, when temperature of set treatment was constant, between t, time of heating in treating bath, and S, set of wool fiber which was stable in water at normal temperature. S=k+alog10t( 1) where both k and a are constants of positive numbers. With S, the function of T the tem perature of set treatment it may be expressed by furthermore S=n+rTwhere both n and 7 are also constants. These constants under various conditions were discussed.The effects of pH values of treating baths to set S are divided into following three divisions;(a) Acidic region below 2.8 of pH value gives remarkable effects to sets of wool fibers, (b) Region which makes sets depend scareely on pH values, and (c) Alkaline region gives remarkable effects to set. By increasing temperature of treating bath, region (b) tends to diminish and transfers gra dually to region (c).The effect of numbers of twists, that is degree of deformation, on sets appears at the lower treating bath temperature.Results obtained from these experiments show that they have same tendencies as experiment made on sets of the worsted yarns and worsted fabrics. (Received 22. 6. 1957)