Geffertová, Jarmila, 1956- Effect of the thermal ageing of selected characteristics of recycled office paper / Jarmila Geffertová, Anton Geffert, Eva Výbohová. -- obr. -- Lit. - The work was focused on monitoring of changes of selected characteristics of recycled office paper occurring during the modelled thermal ageing. The effect of modelled thermal ageing was manifested mainly by the change of optical characteristics when brightness of recycled paper surface decreased by 40%. The coordinate values L*, a* and b* of the color space moved into the black, red and yellow region of the spectrum in achieving of total color differences E* 14.0 during modelled ageing. Thermal ageing due to hornification and shrinkage of fibers significantly affected the value of air permeability (increasing by 31.5%), the value of swelling of paper (decreasing by 37%), the value of tear index (decreasing by 26%), the value of total crystallinity index (decreasing by 26%) and the value of oxidation index (increasing by 24% ). Modelled thermal ageing slightly reduce the pH values of the surface of the paper (by 5.2%), the values of breaking length (by 5.3%) and the values of intensity of the hydrogen bonds (by 2.6%). The biggest changes of monitored characteristics were observed after the first 6-hour interval of modelled thermal ageing.

In Acta Facultatis Xylologiae Zvolen : vedecký časopis Drevárskej fakulty. -- Zvolen : Technická univerzita vo Zvolene, 2017. -- ISSN 1336-3824. -- Roč. 59, č. 1 (2017), s. 59-73

I. Geffert, Anton, 1955-
II. Výbohová, Eva, 1974-
III. Acta Facultatis Xylologiae Zvolen : vedecký časopis Drevárskej fakulty. -- Roč. 59, č. 1 (2017), s. 59-73
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