What is the count of spandex core spun yarn

Calculation of core spun yarn count: take 10 warp or weft yarns of the same length (the more the number, the more accurate), and weigh the gram weight of 10 yarns with a special instrument Warp count = warp length (CM) * number of yarns / 100 / gram weight * coefficient (0.5905) - except 100, CM is replaced by M weft count, which is also the corresponding calculation method Conversion method of count (s) and denier (d): denier (d) = 590.5 * 9 / count (s) calculation method of component: a = warp density / warp count B = weft density / weft count a content = A / (a + b) B content = B / (a + B) for example: 120 * 60 / / n70d * C20 first convert n70d into count: n70d = 590.5 * 9 / 70 = 75.92 (s) n = 120 / 75.92 = 1.58 C = 60 / 20 = 3 N component = 1.58 / (1.58 + 3) * 100% = 34% C component = 3 / (1.58 + 3) *100%=66%