Core Spun Based Helical Auxetic Yarn: A Novel Structure for Wearable Protective Textiles

Textile auxetic materials with negative Poisson’s ratio (NPR) have potential applications in protective textile, filtration, and energy absorbance. However, cotton core-spun based auxetic textile is rarely investigated. In this study, cotton core-spun (Lycra)-based helical auxetic yarn (HAY) was developed, and the effects of core filament linear density on the auxetic behavior were studied. Core-spun cotton yarns of 8/1 Nec containing core filament (180, 260, and 420 D) were developed. Then, these core-spun yarns were wrapped with 50 D Dyneema filament at 393 twist/m to make the HAY. The diameter, NPR, and tensile strength of HAY were increased with increasing linear density of Lycra filament. Image analysis of HAY containing 420 D Lycra showed 57% diameter increase with the change in axial strain from 0 to 15 mm. The maximum auxetic behavior with NPR of −3.97 and tensile strength of 26.71 cN/tex was observed in 420 D Lycra-based HAY. This study proved that the cotton core spun-based HAY can be produced with significant auxetic properties for practically potential use in wearable protective textiles.

摘要 具有负泊松比 (NPR) 的纺织辅助材料在防护织物, 过滤和能量吸收方面有潜在的应用. 然而, 以棉包芯纱为基础的人造橡胶织物很少被研究. 本研究开发了以棉包芯纱 (莱卡) 为基础的螺旋型增强子纱 (HAY), 并研究了芯丝线密度对增强子性能的影响. 开发了含芯丝 (180, 260和420 D) 的8/1 Nec包芯棉纱. 然后用50D Dyneema长丝以393转/米的捻度包住这些包芯纱, 制成干草. 干草的直径, NPR和抗拉强度随着莱卡纤维线密度的增加而增加. 对含有420 D莱卡的干草的图像分析显示, 直径随着轴向应变从0到15mm的变化而增加57%. 在420 D莱卡干草中观察到NPR为-3.97, 抗拉强度为26.71 cN/tex的最大拉胀行为. 这项研究证明, 棉包芯纺干草具有显著的辅助性能, 在可穿戴防护纺织品中具有潜在的实际应用价值.