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Erschienen in: Wood Science and Technology 6/2016

01.11.2016 | Original

Effect of hygrothermal treatment on wood properties: color changes and kinetic analysis using four softwood and seven hardwood species

verfasst von: Miyuki U. Matsuo, Katsuya Mitsui, Isao Kobayashi, Mitsuhiro Kohara, Masato Yoshida, Hiroyuki Yamamoto

Erschienen in: Wood Science and Technology | Ausgabe 6/2016

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Abstract

Color changes of four softwood and seven hardwood species during hygrothermal treatment were compared among species and kinetically evaluated. Treatment temperature ranged from 70 to 120 °C, and the durations were 5–150 h. Generally, the \(L^{*}\) (lightness) decreased and the total color differences \((\Delta E_{\text{ab}}^{*})\) increased irrespective of the treatment temperature. \(a^{*}\) and \(b^{*}\) (redness and yellowness) values varied spuriously based on the wood species. Kinetic analysis using the time–temperature superposition principle, which uses the whole data set, was successfully applied to the color changes. The apparent activation energies of the color changes calculated from \(\Delta E_{\text{ab}}^{*}\) were 24.3–40.8 kJ/mol for softwood and 32.3–61.3 kJ/mol for hardwood. The average apparent activation energy for hardwood was higher than for softwood. These values were lower than those calculated from other material properties. The obtained results will contribute to assess the color changes during the early stage of kiln drying and hygrothermal modification of wood.

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Metadaten
Titel
Effect of hygrothermal treatment on wood properties: color changes and kinetic analysis using four softwood and seven hardwood species
verfasst von
Miyuki U. Matsuo
Katsuya Mitsui
Isao Kobayashi
Mitsuhiro Kohara
Masato Yoshida
Hiroyuki Yamamoto
Publikationsdatum
01.11.2016
Verlag
Springer Berlin Heidelberg
Erschienen in
Wood Science and Technology / Ausgabe 6/2016
Print ISSN: 0043-7719
Elektronische ISSN: 1432-5225
DOI
https://doi.org/10.1007/s00226-016-0833-1

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