Wydawnictwa Uczelniane / TUL Press

Stały URI zbioruhttp://hdl.handle.net/11652/17

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20222

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Ma przypisane plikisearch.filters.applied.operator.equals: TakTematsearch.filters.applied.operator.equals: search.filters.subject.elongation

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Teraz wyświetlane 1 - 2 z 2
  • Pozycja
    Analysis of thermal aging effect on the tensile strength of textile materials intended for the reinforcement of conveyor belt
    (Wydawnictwo Politechniki Łódzkiej, 2022) Lemmi, Tsegaye Sh.; Barburski, Marcin
    Woven fabrics produced from high tenacity (HT) polyester/polyamide 66 yarns are most widely used to reinforce conveyor belts in the mechanical rubber goods industry. The tensile property of the conveyor belt is primarily dependent on the property of fabrics used to reinforce the belt. During the production process of the conveyor belt, the textile-rubber reinforcement undergoes a vulcanization process at high temperature to provide compulsory physio-mechanical properties of the belt by adhering the woven fabric with a rubber. Subjecting textile materials to high temperatures for the vulcanization process has an influence on the mechanical properties of the woven fabric. The main aim of this work was to investigate the effect of thermal aging on the tensile property of HT polyester yarn and woven fabric which is intended to reinforce conveyor belt. An extensive experiment on HT polyester yarn and the woven fabric was conducted by subjecting the textile materials to various aging temperatures. Additionally, the tensile property of fabrics after the vulcanization process of the conveyor belt was conducted to fully understand the effect of vulcanization temperature on the properties of woven fabric. The experimental test results of polyester yarn, woven fabric, and fabrics removed from the conveyor belt revealed that vulcanizing of the textile reinforced conveyor belt at high temperature(220 °C) can diminish the tensile strength and increase the elongation at break of the yarn and fabric.
  • Pozycja
    Analysis of the local yarn elongation states during the highly dynamic stitch formation process using the example of high performance warp knitting
    (Wydawnictwo Politechniki Łódzkiej, 2022) Bruns, Mathis; Nocke, Andreas; Golla, Anke; Cherif, Chokri
    Most textile processing methods are dominated by highly inconstant and dynamic thread demands. In terms of increasing production speeds in textile industry or the effort not to influence the fabric appearance by machine stops etc., an effective control and parameterization of the machine is indispensable. This requires precise knowledge of the actual condition of the thread during processing. The state of the warp yarn sheet depends, for example, on the current yarn tension or elongation. While the yarn tension can be easily measured with mobile yarn tension meters, the actual elongation of the yarns is more difficult to observe in the highly dynamic process. Since high-speed warp knitting is one of the most dynamic textile production processes, an observation of the actual elongation states of the yarns to be processed during warp knitting is performed using highspeed optical image acquisition and image recognition algorithms. These experiments and the results are presented in this paper.