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Polymers 2018, 10(2), 226;

Woven Fabrics Made of Auxetic Plied Yarns

Institute of Textile and Clothing, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, China
Author to whom correspondence should be addressed.
Received: 24 January 2018 / Revised: 19 February 2018 / Accepted: 22 February 2018 / Published: 24 February 2018
(This article belongs to the Special Issue Textile and Textile-Based Materials)
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Auxetic plied yarns are specially constructed with two types of single yarns of different sizes and moduli. This paper investigates how to use these types of yarns to produce woven fabrics with auxetic effects. Four-ply auxetic yarns were first incorporated into a series of woven fabrics with different design parameters to study their auxetic behavior and percent open area during extension. Effects of auxetic plied yarn arrangement, single component yarn properties, weft yarn type, and weave structure were then evaluated. Additional double helical yarn (DHY) and 6-ply auxetic yarn woven fabrics were also made for comparison. The results show that the alternative arrangement of S- and Z-twisted 4-ply auxetic yarns in a woven fabric can generate a higher negative Poisson’s ratio (NPR) of the fabric. While the higher single stiff yarn modulus of auxetic yarn can result in greater NPR behavior, finer soft auxetic yarn does not necessarily generate such an effect. Weft yarns with low modulus and short float over the 4-ply auxetic yarns in fabric structure are favorable for producing high NPR behavior. The weft cover factor greatly affects the variation of the percent open area of the 4-ply auxetic yarn fabrics during extension. When different kinds of helical auxetic yarns (HAYs) are made into fabrics, the fabric made of DHY does not have the highest NPR effect but it has the highest percent open area, which increases with increasing tensile strain. View Full-Text
Keywords: auxetic yarns; negative Poisson’s ratio; auxetic textiles; woven fabric auxetic yarns; negative Poisson’s ratio; auxetic textiles; woven fabric

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Ng, W.S.; Hu, H. Woven Fabrics Made of Auxetic Plied Yarns. Polymers 2018, 10, 226.

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