THE EFFECT OF STEAMING ON THE COLOR CHANGE OF FALSE HEARTWOOD BEECH
Keywords:
beech wood, false heartwood, wood color, wood steaming, color difference, color dispersionAbstract
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.
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