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Monumentální umění skalních maleb prvobytné společnosti
Title Monumentální umění skalních maleb prvobytné společnosti Author info Jan Jelínek Author Jelínek Jan
Issue data Brno : Moravské muzeum , 1961. - 78, [2] s. : il. Keywords výtvarné umenie - fine art nástenné maľby - mural painting Language Czech Country -CS systematics 75.04(069) Catal.org. BB301 - Univerzitná knižnica Univerzity Mateja Bela v Banskej Bystrici Database xkni - BOOKS Copy count 1, currently available 1 book
Call number Location Sublocation Umiestnenie Info 71776 Univerzita Mateja Bela Department of absent lending – deposit. Available in 2 days. Source document Materials. Vol. 12, no. 8 (2019), pp. 1-15. - Basel : Multidisciplinary Digital Publishing Institute, 2019 Keywords buková kôra - beech bark ecological analysis výroba - produkcia - production Form. Descr. články - journal articles Language English Country Switzerland systematics 62 Annotation The results of research into utilizing grinded beech bark in order to substitute commonly used fillers in urea formaldehyde (UF) adhesive mixtures to bond plywood are presented in the present study. Four test groups of plywood with various adhesive mixtures were manufactured under laboratory conditions and used for experimentation. Plywood made using the same technology, with the common filler (technical flour), was used as a reference material. Three different concentrations of grinded beech bark were used. The thermal conductivity of the fillers used, viscosity and its time dependence, homogeneity and the dispersion performance of fillers were evaluated in the analysis of adhesive mixture. The time necessary for heating up the material during the pressing process was a further tested parameter. The produced plywood was analyzed in terms of its modulus of elasticity, bending strength, perpendicular tensile strength and free formaldehyde emissions. Following the research results, beech bark can be characterized as an ecologically friendly alternative to technical flour, shortening the time of pressing by up to 27%. At the same time, in terms of the statistics, the mechanical properties and stability of the material changed insignificantly, and the formaldehyde emissions reduced significantly, by up to 74%. The utilization of bark was in compliance with long-term sustainability, resulting in a decrease in the environmental impact of waste generated during the wood processing Public work category ADC No. of Archival Copy 45237
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