2/1, 3/1, 2/2 etc.

Woven fabric consists of warp and weft yarns crossing each other one at a time or in groups. Plain weave always consists of one warp yarn crossing one weft yarn, a 1/1 weave. When two warp yarns cross a weft yarn, this can be indicated as 2/1 weave. 2/2 weave has two warp yarns crossing two weft yarns.

These fractions are read, for example, “three up, one down” for 3/1, indicating that three weaving harnesses are raised, then one is lowered for three warp yarns on the face, then one weft yarn.

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