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The number of wraps will act as a gauge to assess the thickness of unmarked yarn; for example 12 wraps per inch is 12 WPI, and is used to calculate how much yarn is required for various articles, [3] so that 12 is equivalent to 8 ply (worsted weight, medium weight) yarn.
l/m = 1693 × l m /Nec × m/kg, where l/m is the yarn length in metres, l m /Nec is the English cotton count and m/kg is the yarn weight in kilograms. The following length units are defined. Bundle: usually 10 lb (4.5 kg) Thread: a length of 54 in (1.4 m)—the circumference of a warp beam; Lea: 120 yd (110 m) Hank: a length of 7 leas or 840 yd ...
The number of strands used to make the yarn is usually the same as the number of plies it has. Two-ply yarn means two strands were used, three-ply yarn means three strands were used, etc. Embroidery floss is generally a six-ply yarn, for example. [4] There are some exceptions to this, most notably in chain plying.
Tapestry yarn or tapestry wool is a tightly twisted 4-ply yarn that is relatively hard-wearing. The strands cannot be separated, and it is similar in weight to worsted yarn. [ 2 ] : 26
Another measurement of yarn weight, often used by weavers, is wraps per inch (WPI). The yarn is wrapped snugly around a ruler and the number of wraps that fit in an inch are counted. Labels on yarn for handicrafts often include information on gauge, which can also help determine yarn weight. Gauge, known in the UK as tension, is a measurement ...
In the case of ring spun cotton yarns, for example, the following values of K have been found to give the best results. [citation needed] Warp yarns, 35's and less 4.75 Warp yarns, 35's to 80's 4.50 Warp yarns, 80's to 110's 4.25 Filling yarns, medium numbers 3.50