Changes in Wood Tree Species Fagus sylvatica L. and Characteristics of the Thermal Process of Modifying Its color with Saturated Water Steam
Ladislav Dzurenda, Michal Dudiak
Faculty of Wood Sciences and Technology, Technical University in Zvolen, 960 53 Zvolen, Slovakia.
The aim of this work is to present changes in beech wood acquired in the targeted process of color modification of sapwood and mature beech wood with saturated water steam with temperatures tI = 105 ± 2.5 °C for τ = 6 hours. (Mode I), tII = 127.5 ± 2.5 °C for τ = 6.5 hours (Mode II), tIII = 137.5 ± 2.5 °C for τ = 7 hours (Mode III), and also to present characteristics of the technological process in terms of heat and saturated steam consumption.
On the basis of experimental work and subsequent analyzes, for individual modes of thermal modification of beech wood color by water steam, the following are determined:
– the density of thermally treated beech wood with saturated steam,
– the acidity of thermally treated beech wood with saturated steam,
– coordinates of lightness L*, red color a* and yellow color b* of thermally treated beech wood in CIE L* a* b* color space,
– heat consumption per 1 m3 of thermal modification of beech wood color with water steam, consumption of saturated water steam per 1 m3 of thermal modification of beech wood color with saturated water steam.
Keywords: beech wood, the CIE-L*a*b*colour space, thermal treatment, saturated water steam, technical and technological parameters.