Blends of a coarse and fine and a high- and low-strength cotton were varied to determine their effect on open-end spinning and yarn properties. Fiber fineness was more important in open-end than in ring spinning, because fiber paral lelization is poor in open-end yarns. Fiber strength was more important in ring spinning. When a fine fiber was sub stituted for a coarse one, the strength of open-end yarns increased more than did ring yarns, wereas the results were reversed when a weak fiber was replaced with a strong one. The use of the fine fibers or the strong fibers improved both ring- and open-end spinning and yarn strength.
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