35—AN INSTRUMENT FOR THE STUDY OF YARN HAIRINESS

An instrument is described that enables the number of fibres protruding from a yarn to be counted at different distances from the axis. The data from several yarns may be compared directly or, since the data fit a Γ-type distribution, parameters may be calculated that describe the mean length, in a radial direction, the total radial length of all the fibres projecting in a given length of yarn, and the number of fibres protruding from the core. Comparisons so far made show the gross differences between worsted, woollen, and cotton yarns, and more subtle diiferences arising within one system from changes of conditions or material. The effects of rewinding on hairiness are large.