Geometrical parameters of yarn cross-section in plain woven fabric

Abstract

<span style="mso-ansi-language: EN-IN;mso-bidi-language:FA">To study the effect of yarn twist on the geometrical parameters of yarn in a plain woven fabric such as its cross-sectional shape, the samples with various twist levels of warp and weft yarns have been woven and the yarn cross-section parameters are measured using their images obtained by Projectina microscope. The image processing analyses show that the shape of yarn cross-section in the fabric is affected by the twist level. The statistical analysis shows that the increase in yarn twist factor (<i><span style="font-family:Symbol;mso-ascii-font-family:" times="" new="" roman";="" mso-hansi-font-family:"times="" roman";mso-ansi-language:en-in;mso-bidi-language:="" fa;mso-char-type:symbol;mso-symbol-font-family:symbol"="">a</span></i><i>_{<span style="mso-ansi-language:EN-IN;mso-bidi-language:FA">tex</span>}</i><span style="mso-ansi-language:EN-IN;mso-bidi-language:FA">) from 0 to 4600 changes the yarn cross-section shape into a lens shape and then elliptical shape and finally circular-like shape. The major diameter of the elliptical shape of the yarn cross-section decreases as the yarn twist increases, while the minor diameter of the elliptical shape of yarn cross- section increases as the yarn twist increases. The results also show that the twist of one group of yarns (warp) affects the cross-sectional shape of other group of yarns (weft). The ellipticity ratio of the yarns (minor diameter divided by major diameter) increases from 0.35 to 0.86 as the yarn twist factor increases from 0 to 4600.<span style="mso-ansi-language:EN-IN;mso-fareast-language:JA;mso-bidi-language:FA">

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