Effect of Sliver Feeding Position in a Drawing Frame on Radial Distribution of Fibers in Cross-Section of Cotton-Polyester Blended Yarn

Nine different ring cotton-polyester blended yarns (50/50) were prepared to study the effects of sliver feeding position in drawing frame on fibers distribution in yarn cross-section and its properties. Different slices of each type of yarn were cut to take images of yarn cross-section after spinning and dying processes. First، the radial distribution of fibers in yarn cross-section was analyzed using Hamilton migration index. The strength and elongation-at-break of the samples were assessed as two parameters for possible changes affected by fibers positioning. The results showed that، cotton and polyester sliver feeding position in drawing frame did affect fiber distribution of the yarn cross-sectionally as the Hamilton migration index and fiber frequency distribution were different in the prepared yarns. Migration indexes were varied between 9% and 58% in the spun yarns. In addition، there were found meaningful differences between the strength and elongation-at-break of the yarns due to changes in fiber positioning mode which would help to obtain yarns with minimum and maximum strengths.