Study on the Blending Effect of Air-jet Vortex Spun Viscose/Cotton Blended Yarns


Abstract: The paper carried out research on the blending effect of air-jet vortex spun viscose/cotton blended yarns. Adopt blend theory of fibers to verify the model of fibers blending property; use formic acid and zinc chloride method to check the accuracy of blending ratio of slivers and yarns; make yarn section to calculate the migration index of fibers for analyzing the blending uniformity. In the end, the performance indexes of blended yarns were tested. The results indicated that the fibers blending length calculated by blend theory of fibers cannot match with the test result of AFIS, which was probably caused by AFIS testing limitation to chemical fibers; after drawing three times, viscose fibers and cotton fibers have been blended completely; in addition, with the help of reasonable technology design, it can meet the requirement of blending ratio. By analyzing the results, it can be found viscose and cotton fibers are not evenly distributed in the cross-section of yarns, of which viscose fibers showed an inward migrated trend and took up the main part of the yarn surface. Furthermore, indexes like yarn evenness and strength/elongation index of viscose/cotton blended yarns will improve with the increase of viscose contents. And combed cotton yarns are better than carded cotton yarns, of which viscose content affects most to yarn strength/elongation index.

Key words: air-jet vortex spinning; viscose/cotton blending; blend theory of fibers; Hamilton migration index