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Development of stretchable conductive hybrid yarn for wearable electronics application
(Wydawnictwo Politechniki Łódzkiej, 2022) Ahmed, İbrahim Adel Khamis; Çetin, Münire Sibel; Yılmaz, Ayşe Feyza; Atalay, Aslı Tunçay; İnce, Gökhan; Atalay, Özgür
Wearable electronics and electronic textiles are becoming increasingly important as technology advances. To supply the conductivity required in wearable electronics, investigations on the integration of electronic components with textiles by adding conductivity to fabric structures, as well as the development of items generated in this manner in terms of human comfort, have grown. The base materials, i.e., yarns, should be as flexible, thin, and light as possible during the manufacturing and incorporation of electronic textile components (sensors, transmission lines, connections, etc.) into wearable products in order to tolerate the rigid structure and low elasticity of the metallic parts that provide conductivity. In traditional yarn production processes, hybrid yarn production is regularly carried out with numerous modifications. Problems arise in these manufacturing processes due to the fact that the core fiber cannot be precisely positioned in the center of the yarn, the fluctuation of yarn strength throughout the yarn, and the increase in yarn irregularity. The "Direct-Twist - 2C" twisting machine, which can manufacture hybrid-yarn without modification, was employed in this investigation. Unlike previous approaches, hybrid-yarn manufacturing with Direct-Twist aims to overcome the problems found in other ways since the core can be positioned exactly in the center of the yarn. A new hybrid-yarn was generated in this work by employing spandex in the core and silver-plated conductive yarn in the coating. Tensile and resistance measurements performed within the scope of the study demonstrate that a stretchable conductive hybrid-yarn structure with a homogeneous distribution of core and coating structures is achieved.
Knitted interdigital capacitive strain sensor for wearable applications
(Wydawnictwo Politechniki Łódzkiej, 2022) Yılmaz, Ayşe Feyza; Özlem, Kadir; Çetin, Münire Sibel; Atalay, Aslı Tunçay; İnce, Gökhan; Atalay, Özgür
Wearable electronics is a rapidly growing field that has recently begun to enter the consumer electronics industry with viable commercial devices. To fulfil the increased demand for wearable devices robust, compact, reliable, and cost-effective solutions are required. As a result, it is critical to do extensive research into suitable materials and manufacturing processes. This article describes the creation of a strain sensing textile-based interdigital capacitive sensor that is highly configurable, consumes minimal material, produces no waste, and is reproducible and rapid in mass production utilizing computerized weft knitting technology. In this study, it was shown that the knitted interdigital capacitive sensor structure could match the high working range necessary for wearable electrical and soft robotic applications, thanks to its capacity to stretch up to 100%. This work is expected to advance existing technology in wearable electronics and soft robotics in terms of human body motion sensing.