Dzurenda, Ladislav, 1955- The effect of steaming on the color change of false heartwood beech / Ladislav Dzurenda, Michal Dudiak. -- Graf., obr., tab. -- The work presents the results of the color change of false heartwood of beech wood during the steaming process in a pressure autoclave in individual modes in the temperature interval t = 90 to 120 °C. The color of the wood of the false heartwood, depending on the steaming conditions, changes in opposite ways, while at temperatures up to t ≈ 105 °C it becomes pale, and at temperatures above t ≈ 115 °C it becomes darker. Based on the results of the research on the color change of the false heartwood wood in the steaming process, 3 steaming modes were proposed to achieve a targeted change in the color of the false heartwood beech. By steaming the wood with saturated moist air tI = 90 ± 2.5 °C for τ = 8 h, the color of the wood lightens, which is numerically expressed in the color space CIE L*a*b*: L* = 69.2 ± 2.9, a* = 12.7 ± 1.6 and b* = 19.7 ± 1.4. Steam mode II with saturated water steam tII = 115 ± 2.5 °C during τ = 16 h, slight darkening of the wood color of the false heartwood reaches the following values: L* = 56.0 ± 2.4, a* = 12.4 ± 1.4 and b* = 19.2 ± 1.5. The dark brown color described in the color space CIE L*a*b* by the values: L* = 50.0 ± 2.1, a* = 12.4 ± 1.3 and b* = 18.5 ± 1.4 is achieved by the vaporization mode III. at the temperature of saturated water steam tIII = 120 ± 2.5 °C during τ = 24 h.

In Acta Facultatis Xylologiae Zvolen : vedecký časopis Drevárskej fakulty. -- Zvolen : Technická univerzita vo Zvolene, 2024. -- ISSN 1336-3824. -- Vol. 66, no. 2 (2024), s. 23-33

I. Dudiak, Michal, 1993-
II. Acta Facultatis Xylologiae Zvolen : vedecký časopis Drevárskej fakulty. -- Vol. 66, no. 2 (2024), s. 23-33

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