ITAST (Iranian Textile Association of Science and Technology) Journal of Textiles and Polymers 2322-5203 9 1 2021 01 01 Investigation on Physical and Mechanical Properties of Denim Woven Fabrics Made from Different Spandex Percentages Investigation on Physical and Mechanical Properties of Denim Woven Fabrics Made from Different Spandex Percentages 65 75 126735 EN Journal Article 2021 02 20 The main topic investigated in this paper is the<br />analysis of the effect of different spandex percentages on<br />physical and mechanical properties of the denim fabric. The<br />results showed that percentage of elastane has a significant<br />effect on the physical and mechanical properties of cotton/<br />elastane woven denim fabric. The influence of various<br />elastane percentages via the above denim fabric performance<br />parameters is investigated by employing a one-way analysis<br />of variance (ANOVA) statistical software package. Tensile<br />strength of denim fabric decreases as the percentage of the<br />elastane increases because of the lower tenacity of spandex<br />fibers compared to cotton fibers. Fabric breaking elongation<br />increases as spandex percentage increases. The tear strength<br />of denim fabric decreases as elastane percentage increases. As<br />spandex percentage increased, the fabric contraction of the<br />woven fabric increased, which made the fabric more compact<br />and bulk, resulting in higher fabric thickness, fabric weight,<br />and deep shade color. In addition, fabric stretchability and<br />fabric elastic recovery increase with spandex percentage since<br />elastane has higher stretch and makes the structure more<br />compact, but fabric growth decreases as spandex percentage<br />increases, due to the rather high recovery properties of<br />spandex. The obtained results showed that Lycra proportion<br />inside fabric has an effect on the fabric tensile strength,<br />breaking extension, tear strength, stretchability, fabric<br />thickness, GSM, and fabric shade color. http://www.itast.ir/article_126735_f088f3bceb9b9a61ed624105f9fa9af8.pdf