This paper presents it theoretical study of geometry of plain square fabric woven from flexible yarns. Accurate formulae could be obtained to relate different parameters of fabric geometry. It's a usual procedure to measure Yarn density (Yarns cm in tine fabric) and yam diameter. From these two parameters yarn cover ratio can be calculated. If yarn count is known it is needed to measure yam density to be able to estimate yarn diameter. Weave angle. yarn crimp ratio and packing density of yarn into the fabric could be expressed as functions of yarn cover ratio. Fabric Weight (g/m2) could be expressed in terms of yarn diameter. yarn cover ratio, and yarn density (g/cm3). Fabric density (g/cm3) could be expressed in terms of vain density (g/cm3), and yam cover ratio. Picking density of yarn into the fabric could be expressed in terms of yarn cover ratio.
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