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Estimation of quality of thermally modified beech wood with red heartwood by FT-NIR spectroscopy

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Abstract

The research examines the possibility of predicting the mechanical [modulus of rupture (MOR) and modulus of elasticity (MOE)] and physical (oven-dry and air-dry densities) properties of thermally modified beech wood (Fagus moesica C.) with red heartwood by using FT-NIR spectroscopy and partial least squares regression. Samples of sapwood and red heartwood were treated for 4 h at temperatures of 170, 190, and 210 °C. FT-NIR spectra (100 scans and 4 cm−1) were collected on the radial surface at eight points before and after the thermal modification. Oven-dry and air-dry densities as well as MOR and MOE determined by three-point bending tests were evaluated. Generally, according to the residual prediction deviation (RPD), the majority of the models obtained can be used for preliminary screening (1.5 < RPD < 2.5). The results of the spectra taken from sapwood were, in most models, better than the spectra of the red heartwood. Statistically, the values of density were mostly better than the values shown in assessment of bending properties. Results show that it is possible to accurately predict the quality of wood after being subjected to high temperatures, based on the spectra collected before the thermal modification. This fact could contribute to a more rational use of wood (especially from red heartwood) in the process of thermal modification.

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Acknowledgments

The authors acknowledge the financial support by the Ministry of Education, Science and Technological Development of the Republic of Serbia (TR 37008 and TR 31041).

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Authors and Affiliations

  1. Department of Technology, Management and Design of Furniture and Wood Products, Faculty of Forestry, University of Belgrade, Kneza Višeslava 1, 11030, Belgrade, Serbia

    Nebojša Todorović, Zdravko Popović & Goran Milić

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  1. Nebojša Todorović
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  2. Zdravko Popović
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  3. Goran Milić
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Correspondence to Nebojša Todorović.

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Todorović, N., Popović, Z. & Milić, G. Estimation of quality of thermally modified beech wood with red heartwood by FT-NIR spectroscopy. Wood Sci Technol 49, 527–549 (2015). https://doi.org/10.1007/s00226-015-0710-3

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