THE HAIR-LENGTH DISTRIBUTION OF YARNS, MEASURED BY MEANS OF THE ZWEIGLE-G-565 HAIRINESS METER

Some features of the experimental hair-length distributions obtained w hen yarn hairiness is measured by means of the Zweigle G 565 apparatus are described. Tests were made on a population of 85 yarns from diffe rent fibres and blends and various spinning processes. It is found fun damentally that the distribution seems to be formed by two exponential mechanisms operating resPectively, for hairs shorter than 3 mm and fo r hairs longer than 3 mm in most of the cases. The first mechanism is valid below the unique theoretical exponential distribution, whereas t he second one tends to be placed above this theoretical distribution. Other features studied are: the role of the type of fibre or blend and the spinning processes; the percentage of hairs exceeding 3 mm calcul ated over the total number of hairs counted; and the effect of a yarn self-rubbing action on the hair-length distribution and yarn-hairiness parameters.