Browsing by Author "Sanetrník, Filip"

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    Effect of repeated loading on compressional rigidity of highlofts
    (Inst Chemical Fibres, 2002-01-01) Jirsák, Oldřich; Burian, Tomáš; Sanetrník, Filip
    Highloft textile materials are developed to replace non-recyclable foams for numerous end uses such as upholstery, mattresses, the automotive industry and many others. Better hygienic properties, recyclability and environmental friendliness are the main advantages of fibrous bulky materials when compared with foams. Nevertheless, the elastic properties of textile highlofts after repeated, long-term use and/or hot loading are still a weak point limiting their heavy-duty end-use, especially in the automotive industry, In the article, a method is suggested and tested to characterise the loss of compressional rigidity of bulky materials due to repeated loading during end-use. This method is used to evaluate the properties of fibrous highlofts developed with improved compressional properties.
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    Lineární útvary pokryté nanovlákny
    Sanetrník, Filip
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    Lineární útvary pokryté nanovlákny
    (Technická Univerzita v Liberci, 2013-01-01) Sanetrník, Filip; Jirsák, Oldřich
    Tato bakalářská práce se věnuje textilním lineárním útvarům obsahujícím nanovlákna. V teoretické části studuje a kriticky hodnotí dosavadní výsledky vývoje těchto útvarů, popisuje technologii a zařízení k výrobě těchto útvarů a definuje nezávislé a závislé proměnné procesu jejich výroby. V praktické části popisuje sérii experimentů zaměřených na studium vztahů mezi parametry ochranné bandáže nanovlákenného povlaku a plněním její funkce.
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    Polyamic Acid Nanofibers Produced by Needleless Electrospinning
    (Hindawi Publishing Corporation, 2010-01-01) Jirsák, Oldřich; Sysel, Petr; Sanetrník, Filip; Hrůza, Jakub; Chaloupek, Jiří
    The polyimide precursor (polyamic acid) produced of 4, 4'-oxydiphthalic anhydride and 4, 4'-oxydianiline was electrospun using needleless electrospinning method. Nonwoven layers consisting of submicron fibers with diameters in the range about 143-470 nm on the polypropylene spunbond supporting web were produced. Filtration properties of these nanofiber layers on the highly permeable polypropylene support-namely filtration effectivity and pressure drop-were evaluated. Consequently, these polyamic acid fibers were heated to receive polyimide nanofibers. The imidization process has been studied using IR spectroscopy. Some comparisons with the chemically identical polyimide prepared as the film were made.