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Hygroscopicity of heat-treated spruce wood is investigated in relation to the mass loss that occurs during the thermal treatment. It is found that the reduction in hygroscopicity is not only due to mass loss, but another mechanism exists. It is hypothesized that this mechanism is related to irreversible hydrogen bonding in the course of water movements within the pore system of the cell walls. Regarding batch experiments with constant amount of water and wood, such hornification occurs during a wetting and drying cycle induced by heating to a predetermined steady-state temperature, provided an intermediate relative humidity prevails at the isothermal stage.
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References
Bourgois J, Guyonnet R (1988) Characterization and analysis of torrefied wood. Wood Sci Technol 22:143–155
Crawshaw J, Cameron RE (2000) A small angle X-ray scattering study of pore structure in Tencel® cellulose fibres and the effects of physical treatments. Polymer 41:4691–4698
Fahlén J, Salmén L (2003) Cross-sectional structure of the secondary wall of wood fibers as affected by processing. J Mater Sci 38:119–126
Hakkou M, Pétrissans M, El Bakali I, Gérardin P, Zoulalian A (2005a) Wettability changes and mass loss during heat treatments of wood. Holzforschung 59:35–37
Hakkou M, Pétrissans M, Zoulalian A, Gérardin P (2005b) Investigation of wood wettability changes during heat treatment on the basis of chemical analysis. Polym Degrad Stabil 89:1–5
Kato KL, Cameron RE (1999) Structure-property relationships in thermally aged cellulose fibers and paper. J Appl Polym Sci 74:1465–1477
Matsuda Y, Isogai A, Onabe F (1994) Effects of thermal and hydrothermal treatments on the reswelling capabilities of pulps and papersheets. J Pulp Pap Sci 20:323–327
Militz H (2002) Heat treatment technologies in Europe: scientific background and technological state-of-art. In: Enhancing the durability of lumber and engineered wood products. Forest Products Society, Kissimmee, Orlando, USA, February 11–13
Repellin V, Guyonnet R (2005) Evaluation of heat-treated wood swelling by differential scanning calorimetry in relation to chemical composition. Holzforschung 59:28–34
Stamm AJ, Burr HK, Kline AA (1946) Staybwood. Heat-stabilized wood. Ind Eng Chem 38:630–634
Weise U (1998) Hornification: mechanisms and terminology. Pap Puu- Pap Tim 80:110–115
Zaman A, Alén R, Kotilainen R (2000) Thermal behavior of Scots pine (Pinus sylvestris) and silver birch (Betula pendula) at 200–230°C. Wood Fiber Sci 32:138–143
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Marc Borrega gratefully acknowledges funding provided by the North Karelia Regional Fund of the Finnish Cultural Foundation.
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This paper was partly presented at the Nordic Workshop in Wood Engineering, Skellefteå, Sweden, February 21, 2007
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Borrega, M., Kärenlampi, P.P. Hygroscopicity of heat-treated Norway spruce (Picea abies) wood. Eur. J. Wood Prod. 68, 233–235 (2010). https://doi.org/10.1007/s00107-009-0371-8
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DOI: https://doi.org/10.1007/s00107-009-0371-8