30—THE RADIAL DISTRIBUTION OF FIBRES IN BLENDED YARNS: Part I—Characterization by a Migration Index

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Abstract
A method is described whereby any preferential radial distribution of a particular fibre component in a blended yarn, relative to the yarn axis, may be measured and represented by a single numerical parameter, termed the Migration Index. The migration index is based on zoned fibre counts taken on a suitable number of yarn cross-sections (fifty has been found to be adequate for normal purposes) and expresses the actual migration of the component in terms of the maximum possible which could have occurred in the given yarn. Thus, a migration index of ± 100% represents complete separation of the component in question from the other fibres, the positive and negative signs denoting outward and inward migration, respectively, whilst a migration index of zero may be taken to represent uniform distribution of the component throughout the yarn cross-section. The migration index of the second component in a binary blend is equal in value, but opposite in sign, to that of the component under consideration.

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