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Introduction
Publications
Publications (22)
Ammonia nitrogen in water negatively impacts aquatic life. Nitrifying bacteria are slow-growing and sensitive microorganisms, and technology using biofilm is an attractive option for their support. This study aims to demonstrate an optimal structure for microfilament carriers for growth of nitrifying bacteria in the tertiary stage of wastewater tre...
We investigate the manner in which the delivery speed and spinning air pressure of Rieter air-jet spinning machines affect the structural characteristics of viscose air-jet spun yarn (wrapper-fibre ribbon width, wrapper-fibre ribbon helix pitch, wrapper-fibre angle with respect to the yarn axis, yarn diameter, yarn packing density and number of wra...
The article is focused on testing of selected properties of linear and planar textiles from modified cotton yarns. In this article, the influence of woven fabric construction on wettability and possibilities of detection of moisture in the woven fabric is analyzed. Improving the physiological and hygienic properties for woven fabrics can be achieve...
This work deals with analysis of the behavior of two and three-fold twisted multifilament yarn in dependence on twist level. The structure and consequently various parameters and properties of filament fibers bundle are changed due to twisting. For experiment, two and three-fold twisted polyamide and polyester multifilament yarns were used. Selecte...
Effect of ply twist, its direction and number of plies on air-jet plied yarn properties has been studied. It is found that when air-jet yarns are plied in a direction which is similar to single yarn wrapper fibre twist direction, the yarn irregularity, imperfections and hairiness improve, while plying in the opposite direction of the single yarn wr...
Owing to twisting of filament fiber bundle, the structure and consequently various parameters and properties of a fiber bundle are changed. The aim of the work is to verify the effect of multifilament yarn twist (or twist coefficient) on selected mechanical properties such as multifilament tenacity, breaking elongation, and coefficient of fiber str...
The regular equipment for testing of textile materials does not facilitate the elongation of threads at a frequency corresponding to the frequency of loading during technological process, and it does not allow for clamping a thread of the corresponding length. In the Technical University Liberec there has been built a testing equipment for experime...
The textile material (warp) is stressed cyclically at a relative high frequency during the weaving process. Therefore, the special measuring device for analysis of beat up force in the textile material during the weaving process, has been devised in the Weaving Laboratory of the TUL. This paper includes a description of this measuring device. The e...
This paper presents a three-dimensional numerical simulation of the airflow field inside Rieter air jet spinning nozzle. The velocity and pressure distribution were analyzed to describe the principle of yarn formation. The analysis of velocity components and static pressure revealed how the air vortices are created inside the nozzle. A theoretical...
The main aim of this article is to extend piece of knowledge about a deviation rate function (DR(±5%, L)) as one of characteristics of yarn mass irregularity. The relation of deviation rate to other characteristic functions of yarn mass irregularity (in particular to a variance-length curve and also a spectrogram) is analysed. Based on ascertained...
This study deals with a comparison of mechanical properties of a conventional yarn and a textile from nanofibres. The conventional yarn represents the textile objects with high degree of orientation of fibres and the textile from nanofibres represents the textile objects with low degree of orientation of fibres. The theoretical section is concerned...
![Figure 1. Scheme of spinning unit of Vortex spinning machine [12]](publication/276502351/figure/fig1/AS:391440044707849@1470337987874/Scheme-of-spinning-unit-of-Vortex-spinning-machine-12_Q320.jpg)
![Figure 4. Model representation of fibre ribbon [14]](publication/276502351/figure/fig4/AS:391440048902150@1470337988702/Model-representation-of-fibre-ribbon-14_Q320.jpg)
This paper analyzes the relationship between technological parameters of spinning of 100% CV Vortex yarns of different counts and its selected geometrical parameters (a lead of helix of wrapping fibre ribbon, yarn diameter) as well as yarn properties. The number of twist of wrapping fibre layer is determined. The effect of the yarn delivery speed,...
In this article, the possibility of new objective evaluation of yarn appearance in area employing selected spatial
statistical functions is presented. The yarns wound on the boards were used for the experiment. Appearance of
standard yarn boards from the standard CSN 80 0704 and real yarn boards with faultless and faulty yarns were
converted into g...
The paper is focused on the analysis of irregularity of combed yams made from various biending ratios of CO/PL. The level of irregularity (CV) is evaluated in reiation to the percentage representation of cotton in a yarn. Yarn irregularity is measured by a capacitive method (the apparatus Uster Tester IV-SX) and simultaneously by an optical method...
This paper is a direct follow-up of the paper [1] describing in detail the VibTex equipment, which facilitates testing of textiles in a wide range of frequencies of their extension, as well as the determination of corresponding dynamic modules and loss angles. This equipment has been employed for testing polyester yarns of concordant fineness manuf...
The possibility of new and objective evaluation of yarn appearance wound on the board is described. A statistical method which has previously been used for the evaluation of surface unevenness of flat textile - semivariograms is used. The yarn board appearance is converted into a grey-scale image and the fluctuation in degrees of greyness between s...
This paper is concerned with a theoretical description of the dynamic properties of textiles and their experimental analysis. In the theoretical section of the paper, the dynamic prop-erties of textiles are described based on rheological models. To describe their dynamic characteristics, the Laplace transformation has been employed. The experimenta...
Principal objective of this paper is a description of a special testing device (VibTex). This device allows testing of textile materials (threads, samples of fabrics, etc.) during cyclical stress at a high frequency. Control of the VibTex allows harmonic and non-harmonic elongation of the textile samples. Results of the tests with harmonic elongati...
Our contribution deals with an experimental analysis of the influence of the stress frequency on the deformation properties of the thread. The textile material (the threads) is exposed different ways of the stress during a processing. For example, warp threads are stressed cyclically with a relative high frequency during a weaving. We have to solve...
Unevenness of woven fabric results from irregularity of the yarn used as well as from the process of its manufacture (weaving). A periodical and non-periodical yarn irregularity shows itself in the flat textile by known effects -the moiré effect, cloudiness, and stripiness. It is possible to predict the appearance of flat textiles from measured val...
Projects
Projects (5)
We would like to inform you about the International Summer School of “Fabric Patterning” at the Faculty of Textile Engineering, Technical University of Liberec.
Summer school 2020 is oriented on patterning of woven and knitted fabric, including final fabrics realization using the industrial machines. The main aim of summer school is realization from idea to final fabric in weaving as well as knitted section.
Date: August 10th – 21st, 2020, Liberec, Czech Republic.
The registration and more info: www.ft.tul.cz/fabric_patterning
We would like to inform you about the International Summer School of “Fabric Patterning” at the Faculty of Textile Engineering, Technical University of Liberec.
Summer school 2019 is oriented on patterning of woven and knitted fabric, including final fabrics realization using the industrial machines. The main aim of summer school is realization from idea to final fabric in weaving as well as knitted section.
Date: August 12th - 23th, 2019, Liberec, Czech Republic.
The registration and more info: www.ft.tul.cz/fabric_patterning
Gallery and Catalogue:
http://www.ft.tul.cz/veda-a-vyzkum/summer-school-2020/gallery-and-catalogue-2019
