Heat as a Conductivity Factor of Electrically Conductive Yarns Woven into Fabric

Abstract

In recent years, more and more researchers have been focused on electrically conductive textiles that generate heat or transmit electrical signals and energy to embedded electrical components. In this paper, the dissipation of heat due to the flow of electric current at given voltages is investigated, and at the same time it is determined how this heat affects the change in the electrical resistance of the electrically conductive yarn in the immediate surroundings. Three fabric samples were woven in a plain weave with three types of different electrically conductive yarns. Three electrically conductive yarns are woven in parallel in the weft direction and separated from each other by one polyester (PES) yarn due to electrical insulaton. Conductive yarns are electrically connected so that the outer yarns are used for heating by the flow of electric current at a certain constant voltage, and the central yarn is used only to measure changes in electrical resistance. When electrothermally conductive fabrics are subjected to certain voltages over time, experimental results have shown that resistance values increase over a short period of time and then gradually decrease, while the temperature gradually increases and stabilizes over time. Based on the analysis of the obtained results of the ratio between the values of applied voltage and temperature to the electrically conductive yarns, the value of thermal dissipation in conductive yarns can be calculated in advance depending on the applied voltage. Furthermore, the obtained results can be further used in applications where conductive yarns are used as heaters for realistic prediction of the obtained heat.

A Review of the Electrical Conductivity Test Methods for Conductive Fabrics

“…Moreover, from a microscopic point of view, these forces can also change the atomic structure, affecting the resistivity. On the other hand, the environmental factors that affect the resistivity include humidity [41,42], temperature [43], and magnetic fields [44]. First, moisture can provide a conduction path in fabrics, thus reducing the resistivity.…”

Study on Viscoelastic Poisson's Ratio of Nonwovens

“…In order to analyze the Poisson's ratio and creep compliance of asphalt concrete mixture, Lee and Kim [4] (2009) derived analytical algorithms to determine it in time-and frequency-domain and verified it by means of an indirect tension test. Penava Ž et al [5] (2017) determined the breaking properties and the Poisson's ratio of woven fabrics with different raw material compositions by uniaxial testing, where the Poisson's ratio of cotton fabrics was higher than that of wool fabrics at the same extended condition, with the Poisson's ratio increasing nonlinearly and decreasing after having reached the peak value. Hoshino Y et al [2] (2018) proposed a two-dimensional digital image correlation to directly measure the Poisson's ratio in a dynamic viscoelastic test and verified it by testing the material properties of epoxy resin.…”