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Liberec, Czech Republic

Mangat M.M.,Textile Faculty | Militky J.,Textile Faculty | Hes L.,Textile Faculty
Vlakna a Textil | Year: 2012

This study is an effort to develop a mathematical model for the prediction of thermal resistance of cotton type textile fabrics under dynamic wet conditions. Thermal resistance was tested with the help of Alambeta at various moisture percentages. Mathematical model was developed based on simulation of the interaction between the main ingredient of fabric, fibre air and moisture. Model has a high correlation with the measured values and follows the trend line. Moreover, results show that there is a systematic decrease in thermal resistance with the increase of moisture. But it does not obey a linear relationship. Rather drastic change occurs at initial stage and thereafter, less change in thermal resistance has been observed. Source

Kremenakova D.,Textile Faculty | Militky J.,Textile Faculty | Huang J.,Textile Faculty
Key Engineering Materials | Year: 2014

The acoustic or sonic pulse-propagation technique for the measurement of dynamic elastic modulus has the advantage of not being dependent on the sample cross-sectional characteristics. This technique also gives a direct measure of modulus rather than the indirect measure in the form of load versus extension. The sonic tests are relatively simple to apply and are nondestructive. The values of sonic modulus of fibrous structures are dependent on the orientation of components and packing density as well. The main aim of this work is to quantify effect of yarn twist on the sonic modulus of staple yarns from polypropylene fibers. The results are compared with selected models of yarn twist influence on the mechanical properties of staple yarns. The correlation between yarn orientation factor defined by Pan and sonic modulus are shown. The sonic modulus is compared with tensile modulus of yarns. Source

Kremenakova D.,Textile Faculty | Militky J.,Textile Faculty | Meryova B.,Textile Faculty
Journal of Fiber Bioengineering and Informatics | Year: 2012

The main aim is evaluation of illumination intensity for side emitting plastic optical fibers in dependence on the distance from light source. The special device for measurement of light intensity on surface and cross section at various distances from light source is described. The dependence of surface and cross section light intensity on the distance from light source is expressed by the exponential type model with two parameters; it is illumination intensity in the input into fiber and fiber attenuation factor. For textile structures with optical fibers the illumination intensity is evaluated as well. It was found that illumination intensity of textile structures is very different. It is dependent on the trajectory of optical fiber in textile structure. The highest illumination intensity is for straight fiber in textile with lower waviness. © 2012 Binary Information Press & Textile Bioengineering and Informatics Society. Source

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