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Variations in beech wood surface performance associated with prolonged heat treatment at 200 °C
Názov Variations in beech wood surface performance associated with prolonged heat treatment at 200 °C Aut.údaje Jozef Kúdela ... [et al.] Spoluautori Kúdela Jozef TUZDFNOD - Katedra náuky o dreve Lagaňa Rastislav TUZDFNOD - Katedra náuky o dreve Andor Tomáš TUZDFNOD - Katedra náuky o dreve Csiha Csilla Zdroj.dok. Acta Facultatis Xylologiae Zvolen : vedecký časopis Drevárskej fakulty. Vol. 62, no. 1 (2020), s. 5-17. - Zvolen : Technická univerzita vo Zvolene, 2020 Poznámky Lit. Jazyk dok. angličtina Krajina Slovenská republika Systematika 674.031.632.2 630*81 Heslá bukové drevo - beech wood * termická modifikácia - thermal modification * farba dreva - colour of wood * drsnosť - roughness * zmáčanie dreva - wetting of wood * kontaktný uhol - contact angle * povrchová energia - surface energy Anotácia The research was aimed atanalysing the discolouration, morphology and wetting of beech wood thermally modified under influence of a temperature of 200 °C acting during three heating periods (1, 3, and 5 hours). The results show that with progressing heating time, the lightness L*decreased significantly, while the coordinates a*and b* increased as long as for three hours. Subsequently, a moderate decrease followed. Just after one-hour-lasting thermal modification, the total colour difference DE value was much higher than 12. It means that a totally new colour resulted from the thermal treatment as shortas one-hour. Further treatment prolongation induced further DE increase, nevertheless, more moderate. Enhanced roughness was indicated by an inspection of the changes in the beech wood surface morphology. But this fact was not confirmed unambiguously in all three heating periods. The results show that the beech wood thermal treatment resulted in significantly improved resistance of beech wood surface to wetting proven by the wetting contact angle values q˃90°. Moreover, the time necessary for the complete drop soaking into the substrate increased by one or two orders. The wetting varied mainly due to the treatment temperature. The importance of treatment duration was not confirmed unambiguously. The reduced wood surface wetting significantly affected lowering the wood surface free energy, which was mainly due to a decrease in the polar component of this energy. This fact may negatively affect the surface treatment quality if the coating materials are applied on the wood modified this way. URL https://df.tuzvo.sk/sites/default/files/01-01-20.pdf Kategória publikačnej činnosti ADN Báza dát xcla - ČLÁNKY Druh dok. RBX - rozpis článkov z periodík Odkazy PERIODIKÁ-Súborný záznam periodika Zväzky 2020: 1-2 
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