LEE- Yenilikçi Teknik Tekstiller Lisansüstü Programı

Bu topluluk için Kalıcı Uri

http://hdl.handle.net/11527/19497

Gözat

Konu "functional textile" ile LEE- Yenilikçi Teknik Tekstiller Lisansüstü Programı'a göz atma
  • Öge
    Developing a pressure sensor for 3D nonwoven assemblies by using novel spacer stitching technology
    (Graduate School, 2025-07-09) Mula, Rana Nur ; Gürarslan, Alper ; 503231858 ; Innovative Technical Textiles
    This thesis investigates the development of pressure sensors using a stitch-based production method, focusing on their application in wearable technology and smart textiles. In the face of the disadvantages of traditional solid-state sensors, such as being heavy, rigid, subject to loss of sensitivity over time, and being costly, textile-based sensors stand out with their advantages of lightness, flexibility, body compatibility, and low cost. In this direction, in the introduction section, the working principles of capacitive, piezoelectric, and resistive sensors used in pressure sensing are first mentioned, then their applicability to textile surfaces is discussed by showing sample studies from the literature. As an innovation of the thesis study, it is aimed to apply the "spacer stitching" technique, which prevents fabric compression during sewing and transforms the conductive sewing thread into a sensor element, for the first time in the development of pressure sensors from 3D nonwoven textile structures. In the method and material section, the materials and processes used in the experimental study are explained in detail. While producing the nonwoven surface forming the pressure sensor's structure, it aimed to evaluate the waste natural fibers. The nonwoven surface fabric was produced by blending milkweed (Asclepias syriaca) and polyester (PET) fibers. Milkweed fibers are biodegradable and have a hydrophobic and hollow structure, and a blended web created by mixing them with hollow PET staple fibers. First, a nonwoven web is created by using PET and milkweed fibers, then the web is passed through a double-sided needle-punching machine to improve the strength and other physical performances, and becomes a durable needle-punched nonwoven fabric. The most important innovation of the thesis, the spacer stitching technology, was applied to the created three-layer nonwoven structure to provide conductivity and make it sensitive to pressure. Within the scope of experimental studies, the performance of the developed nonwoven fabrics was evaluated with multi-dimensional tests. All these tests were compared with similar materials reported in the literature and the suitability of the nonwoven layers for sensor application was analyzed. In the results section, the findings of the tests performed and the success of the sensor application are presented in detail. These findings demonstrate that the developed nonwoven structure exhibits excellent insulation properties, providing protection against environmental effects for sensor applications. In the last stage of the thesis, it was verified with a practical circuit demonstration that the developed spacer stitched nonwoven structure fulfills the pressure sensor function. This result shows that the spacer stitching technique can be a reliable sensing method in different textile structures.