Electromechanical properties of knitted structures for potential socks sensing systems

Abstract

The use of knitted structure pressure sensors in wearable applications and health monitoring systems has attracted a great deal of attention. This study aims to assess the single jersey and double jersey knitted structures as well as the electromechanical characteristics of electrically conductive yarns (ECY). The knitted structures were made with two different types of electrically conductive yarn, including the (i) fully drawn yarn (FDY) and the (ii) drawn textured yarn (DTY). FDY had higher tensile strength than DTY in reference to their drawing and twisting processes. Based on the results in terms of tensile strength, conductive yarns of 280D-FDY and SPFX25070-FX were chosen from seven available conductive yarns for the further production of knitted structures. Additionally, the knittability of the conductive yarn was also considered. Due to the knit-tuck stitch assembly, which increases the thickness of the structure, it was found that the double Lacoste, popcorn, and milano ribs had the necessary compression resistance. The compression properties of the knitted structures were tested using the kawabata evaluation system (KES FB-03). It was found that the recommended knitted structure sensing technology can be easily expanded into a scalable and affordable solution for the production of smart socks and related applications.