Part II: Comparison of Disc-Ring and Woolen Ring Spun Yarn Structure and Properties

The structure and properties of disc-ring yams made from five commercial 80/20 wool/nylon blends are compared with conventional woolen ring spun yams of the same blends and equivalent yam counts. Blends with the highest percentage of coarse wool fibers produce disc-ring yams with tensile properties similar to the woolen ring spun yams, but the former have better evenness properties. Tracer fiber studies reveal that the structure of disc-ring yams consists of a disordered arrangement of the con stituent fibers. Analysis of the yarn cross section shows that with the disc-ring yarn, fiber packing density increases from the center to the outer zone of the yam. The woolen ring-spun yam shows the converse tendency. In general, disc-ring yams are more bulky than woolen ring spun yams.