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Mode for hot air drying of steamed beech blanks while keeping the colours acquired in the steaming process
Názov Mode for hot air drying of steamed beech blanks while keeping the colours acquired in the steaming process Aut.údaje Ladislav Dzurenda Autor Dzurenda Ladislav TUZDFOD - Katedra obrábania dreva Zdroj.dok. Acta Facultatis Xylologiae Zvolen : vedecký časopis Drevárskej fakulty. Vol. 64, no. 1 (2022), s. 81-88. - Zvolen : Technická univerzita vo Zvolene, 2022 Poznámky Lit. Jazyk dok. angličtina Krajina Slovenská republika Systematika 630*854 630*176.1 658.62 Heslá buk - beech - Fagus L. * bukové prírezy - beech dimension timber * teplovzdušné sušenie - heat-air drying * režim sušenia - drying schedule * farba dreva - colour of wood Anotácia The analysis of the impact of proposed external conditions for hot air drying of steamed beech wood (Fagus sylvatica L.) blanks from the initial moisture content of w1 ≈ 50 % to final moisture content w2 = 10 % on the maintaining the colour of wood obtained in the process of steaming at the following modes: mode I (tI = 95 ± 2.5 °C), mode II (tII = 115 ± 2.5 °C), mode III (tIII = 135 ± 2.5 °C) is presented in the paper. The drying process is divided into two parts. Evaporation of free water from wet wood at drying medium temperatures ts = 35 ÷ 40 °C and relative humidity φ = 70 – 60 %, when there are no chemical changes in the lignin-saccharide complex of beech wood manifested by the decomposition of chromophore structures and the formation of new functional groups manifested by a change in the colour of the wood. Evaporation of bound water from beech wood below the hygroscopicity limit is performed at the temperatures ts = 70 ÷ 80 °C. The colour coordinates in the colour space CIE L*a*b* of beech wood steamed by mode I after drying are: L* = 69.6 ± 1.7; a* = 11.3 ± 0.9; b* = 19.6 ± 1.2, steamed by mode II are: L* = 64.6 ± 1.6; a* = 13.0 ± 0.7; b* = 22.7 ± 1.0 and steamed mode III are: L* = 54.5 ± 1.5; a* = 13.4 ± 1.1; b* = 25.3 ± 1.3. Differences in the colour of dried steamed beech wood according to the proposed drying mode and dried in an air-conditioned space is in the range of values ∆E* = 1.3 – 1.8. URL https://df.tuzvo.sk/sites/default/files/07-01-22_0_0_0_1.pdf Kategória publikačnej činnosti ADN Báza dát xcla - ČLÁNKY Druh dok. RBX - rozpis článkov z periodík Odkazy PERIODIKÁ-Súborný záznam periodika Čísla 2022: 1 
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