Wyniki wyszukiwania - BazTech

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Knitted Heating Mats

Pieklak Katarzyna, Mikołajczyk Zbigniew, Łopińska Julianna

Fibres & Textiles in Eastern Europe

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2023

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Vol. 31, no. 6

39--50

EN

The paper deals with conceptual designs and research on flexible knitted heating mats differing in construction from textile heaters on low-elastic woven or nonwoven-foil substrates. Two variants of heating mats with elasticity from 100 to 300 % of relative elongation were designed and manufactured using knitting technology. The heating elements of the mats were parallel-connected sets of electrically conducted carbon threads and synthetic threads coated with silver. With considerable elongation in the range of 210÷270 % no damage was observed to the heating elements and resistance changes during the stretching process equaled from 0.015 to 0.22 Ω/% of elongation. The optimum power of the knitted heater in the range from 16 to 41 W, with high thermal efficiency for a 12 V supply voltage, was obtained thanks to proper density of the electrically conductive threads (resistors) and the appropriate structure of the knitted fabric. The surface temperature of the heater can be adjusted from 34 to 43 °C, which corresponds to human thermal comfort. One of the variants of the knitted heaters was applied in the construction of the seat and backrest of an office chair

2

Optical Fibers in the Design and Fabrication of Smart Garments – a Review

King Raji Rafiu, Qin Luo, Ning Li, Haijin Liu

Fibres & Textiles in Eastern Europe

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2022

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Vol. 30, no. 1 (151)

31--42

EN

Several publications and even commercial products showcasing the application of optical fibers for textile goods abound in literature. Optical fibers can be employed as sensors by making use of physical principles to sense strain, temperature, and other quantities by tailoring the fiber such that the quantity to be measured alters the intensity, phase, polarisation, and wavelength of light within the fiber. However, a paper directed at the development of textile based applications or smart garments using optical fibers is lacking. This review seeks to serve as apt reference material for the development of optical fiber based textile sensors or smart garments with a focus on the application of plastic optical fibers (POFs). Highlighted are the salient material properties of POFs and their importance in delivering satisfactory sensing results. Special treatment has also been given to their proposed feasibility for embedment within weft knitted structures.

3

Identification of the Process of Dynamic Stretching of Threads in Warp-Knitting Technology

Prążyńska A., Mikołajczyk Z.

Autex Research Journal

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2017

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Vol. 17, no. 4

334--343

EN

The publication presents a theoretical study of the susceptibility of rheological models of threads to dynamic stretching in the context of modern, highly efficient textile technologies. Input parameters of the four analyzed models, the Kelvin-Voigt model, the Maxwell model, Standard model 2, and the Zener model, corresponded to the actual values of the coefficients of viscosity, elasticity, kinematic and dynamic loading, and stretching speed for the analyzed polyester silk threads produced in a knitting process, with knitting speeds from 700 to 1,600 courses/min. The research proves that the tested thread models behave differently in the stretching process-the Kelvin-Voigt model is sensitive to both the increases in kinematic loading and viscosity coefficient, Standard model 2 is only susceptible to dynamic stiffness, and the Zener model is significantly sensitive to kinematic loading. All responses of the models increase with the increase in stretching speeds. The obtained results indicate substantial “accuracy tolerance” in setting input parameters while identifying dynamics of the knitting process on warp-knitting machines.

4

New structure of the drive of small-diameter knitting machines

Skrivanek J., Bilek M.

Autex Research Journal

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2012

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Vol. 12, no. 1

14--19

EN

This paper is concerned with the drive of small-diameter knitting machines and its optimal structure in reference to the knitting process. Based on an analysis of existing machines, a new structure is proposed employing controlled drives. In this proposal, emphasis has been laid on minimising the consumption of electric power and on simplifying the mechanical section of the structure. An analysis of the dynamic characteristics of the newly proposed concept, and a comparison with existing machines has been carried out.

5

New approach to a theoretical study of some of the parameters in the knitting process, and their influence on knit-fabric stitch density

Charalambus A.

Autex Research Journal

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2007

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Vol. 7, no. 2

95--99

EN

This paper proves relations, which concern the structure of knitted fabric by using a simple geometrical model. In addition, a series of graphics are made which allow fast, simple and effective analysis of the relations between some of the parameters of the knitting process and these of the ready-knit fabric. The quantity "relative geometrical prolongation of the thread length in the stitch", introduced by me plays a significant role in this study. The relations given below allow the machine gauge to be defined; this helps to produce knit fabric with precisely calculated density by choosing appropriate values for the thread's sinking depth and acceptable average geometrical prolongation.

6

Assessment of Knitting Process Dynamics Using Computer Thermovision Method

Mikołajczyk Z., Więcek B., Zwolenik S.

Fibres & Textiles in Eastern Europe

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2005

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Vol. 13, no. 2 (50)

51--55

EN

The research aim of this work was to assess the usefulness of the thermovisual method in the qualitative and quantitative analysis of tension changes in warp threads during the technological process of manufacture anisostructural warp knitted fabrics. Research carried out with the use of warp-knitting machines shows that significant temperature changes occur in the region of the knitting zone and its surroundings. One characteristic of temperature changes in the knitting zone is the identical frequency of pulsation as an oscillatory input function of warp thread tensions which equal 0.15 Hz. The periodic characteristics of thread forces and temperature changes differ, which is rooted in the dissimilarity of the methods used. At the present stage of research, there is a lack of unequivocal correlation between instantaneous force values in threads measured by the tensometric method and temperature values measured with the use of a thermovision camera.

PL

Celem przedstawionych badań była ocena przydatności metody termowizyjnej w analizie jakościowej oraz ilościowej zmian obciążeń dynamicznych nitek osnowy, w procesie wytwarzania dzianin anizostrukturalnych kolumienkowych. Z badań, przeprowadzonych na osnowarce wynika, że istotne zmiany temperatury występują w polu obrazującym strefą dziania. Dla wymuszeń oscylacyjnych naprężeń nitek osnowy równych 0,15 Hz charakterystyka zmian temperatury strefy dziania posiada identyczną częstotliwość pulsacji. Charakterystyki okresowe sił w nitkach i zmian temperatury są odmienne, co wynika z różniącej się specyfiki stosowanych metod pomiarowych. Na obecnym etapie badań brak jednoznacznej korelacji między chwilowymi wartościami sił w nitkach, mierzonymi techniką tensometryczną a wartościami temperatury, mierzonymi kamerą termowizyjną.