28—a Measure of Fibre Distribution in Blended Yarns and Its Application to the Determination of the Degree of Mixing Achieved in Different Processes

A quantitative measure of the extent to which the fibre distribution in a blended yarn approaches that for completely random mixing can be obtained by counting the groups of fibres of the same kind in cross-sections of the yarn. The degree of mixing is found to depend upon the ratio of the number of fibres in the cross-section of the yarn to the total number of doublings and is independent of the proportions of the blend. The relation found between degree of mixing and number of doublings is applied to the determination of the mixing, in terms of the equivalent number of doublings, achieved by a card and by a scutcher.