Počet záznamov: 1
Mode for hot air drying of steamed beech blanks while keeping the colours acquired in the steaming process
SYS 0114525 LBL 00000naa^^22^^^^^^^^450 005 20220502103122.6 017 70
$a 10.17423/afx.2022.64.1.07 $2 DOI 100 $a 20220502d m y0sloc0103 ba 101 0-
$a eng 102 $a SK 200 1-
$a Mode for hot air drying of steamed beech blanks while keeping the colours acquired in the steaming process $f Ladislav Dzurenda 215 $c Graf., tab. 320 $a Lit. 330 $a 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. 463 -1
$1 001 sldk_un_cat*0114510 $1 011 $a 1336-3824 $1 200 1 $a Acta Facultatis Xylologiae Zvolen $e vedecký časopis Drevárskej fakulty $v Vol. 64, no. 1 (2022), s. 81-88 $1 210 $a Zvolen $c Technická univerzita vo Zvolene $d 2022 610 1-
$9 sldk_un_auth*h010243 $a buk $X beech $Y Fagus L. 610 1-
$9 sldk_un_auth*h017542 $a bukové prírezy $X beech dimension timber 610 1-
$9 sldk_un_auth*h033308 $a teplovzdušné sušenie $X heat-air drying 610 1-
$9 sldk_un_auth*h016813 $a režim sušenia $X drying schedule 610 1-
$9 sldk_un_auth*h013461 $a farba dreva $X colour of wood 675 $a 630*854 $v 1. stred. $z slo 675 $a 630*176.1 $v 1. stred. $z slo 675 $a 658.62 $v 1. stred. $z slo 700 -1
$3 sldk_un_auth*p0016139 $a Dzurenda $b Ladislav $f 1955- $p TUZDFOD $4 070 $T Katedra obrábania dreva 801 -0
$a SK $b ZV001 $c 20220502 $g AACR2 856 4-
$u https://df.tuzvo.sk/sites/default/files/07-01-22_0_0_0_1.pdf
Počet záznamov: 1