Large-scale manufacturing of helical auxetic yarns using a novel semi-coextrusion process

作者：Zhang, Guanhua^*; Ghita, Oana R.; Lin, Congping; Evans, Kenneth E.

来源：Textile Research Journal, 2018, 88(22): 2590-2601.

DOI：10.1177/0040517517725125

• auxetic
• fibers
• mechanical properties
• deformation
• extrusion

This paper introduces a novel extrusion process for manufacturing helical auxetic yarn (HAY). A range of semi-coextruded HAYs have been manufactured in a cost-effective, consistent and readily usable form. The semi-coextruded HAYs were compared to the conventional spun yarns in terms of tensile properties and auxetic behavior. The results show the presence of the auxetic effect in newly fabricated semi-coextruded HAYs. Similar to the traditional spun HAYs, the new HAYs are sensitive to parameters such as the initial wrap angle, the core/wrap diameter ratio and component moduli. Importantly, a few new manufacturing parameters have been identified for tailoring the auxetic behavior of the semi-coextruded HAYs. The semi-coextruded HAYs are auxetic when an instantaneous true Poisson's ratio analysis method is applied. The semi-coextruded HAYs give a larger maximum negative Poisson's ratio than the conventional HAYs due to the advantages of the pre-formed helical wrap structure.

• 出版日期2018-11
• 单位上海理工大学