7—the Mixing of Fibres in Worsted Yarns: Part Ii—fibre Migration

The disposition of wool and nylon fibres within worsted yarns, according to fibre fineness and length, has been studied. Differences in mean fineness between components are associated with a marked predominance of the coarser component in the periphery. This is striking when the two components are separately very uniform, but also occurs in mixtures of wools of markedly different qualities. This phenomenon occurs almost entirely in spinning. Differences of mean fibre length result in the longer fibres being drawn to the centre, especially with very uniform components. This occurs in the later stages of drawing as well as in spinning.