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Diagram showing S and Z twist. There are two common ways to ply a balanced yarn: regular and chain plying. Both methods involve the manipulation of "singles"—unplied strands on their own—into multiple-ply yarns by applying twist in the opposite direction than how the single was spun. For example, if in spinning the single the wheel was spinning clockwise (called a "Z" twist, as on any ...
S-twist and Z-twist yarns. The direction in which the yarn is spun is called twist. Yarns are characterized as S-twist or Z-twist according to the direction of spinning (see diagram). Tightness of twist is measured in TPI (twists per inch or turns per inch). [11] Two or more spun yarns may be twisted together or plied to form a thicker yarn.
ISO 2 is an international standard for direction of twist designation for yarns, complex yarns, slivers, slubbings, rovings, cordage, and related products. [ 1 ] The standard uses capital letters S and Z to indicate the direction of twist, [ 2 ] as suggested by the direction of slant of the central portions of these two letters.
The opposing twist relieves some of the yarns' tendency to curl up and produces a thicker, balanced yarn. Plied yarns may themselves be plied together, producing cabled yarns or multi-stranded yarns. Sometimes, the yarns being plied are fed at different rates, so that one yarn loops around the other, as in bouclé. The single yarns may be dyed ...
Originally made from silk, Georgette is made with highly twisted yarns. Its characteristic crinkly surface is created by alternating S- and Z-twist yarns in both warp and weft. [1] [3] Georgette is made in solid colors and prints and is used for blouses, dresses, evening gowns, saris, and trimmings. [1]
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