Six types of 30 tex silk and cotton blended yarns at 50/50 blending ratio were spun in the cotton spinning system in order to study the effects of blending factors on the fiber distribution in the yarn cross-section. The blending factors studied here were the blending methods, intimate and drawframe blending, and the silk waste types, inferior knubbs, filature gum waste and pierced cocoon. A new method of zoning the yarn cross-section has been proposed in order to analyze the fiber migration. Three migration parameters, the Index of Blend Irregularity, the Migration Intensity and the Migration Index were studied in the present work. The intimate blending gave a more homogeneous fiber distribution, with no radial migration tendency. The coarser silk fibers and more irregular in length provided blends that presented non-random heterogeneity. Generally, the silk fibers slightly tended to migrate toward the yarn core.
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