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Quality assessment of heat-treated wood by NIR spectroscopy

Qualitätsbewertung von wärmebehandeltem Holz mittels NIR-Spektroskopie

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Abstract

NIR spectroscopy was tested for predicting the properties of heat treated wood using pine (Pinus pinaster) and eucalypt (Eucalyptus globulus) woods with two types of treatment: in oven and in a steam autoclave. Mass loss, equilibrium moisture content, dimensional stability, MOE, bending strength, colour CIELAB parameters and extractives content were determined. NIR spectra were obtained using a fibre probe on the radial surface of the samples. NIR models for mass loss showed very high coefficients of determination (R2) for cross validation ranging from 96–98%. The models obtained for wood properties were in general good with coefficients of determination ranging from 78–95% for equilibrium moisture content, 53–78% for dimensional stability, 47–89% for MOE, 75–77% for bending strength and 84–99%, 52–96% and 66–98% for colour parameters L, a* and b*, respectively. R2 of the models for extractive content varied between 41.9–79.8% for pine and between 35.3–82.2% for eucalypt wood. NIR spectroscopy showed a good potential for quality control and characterization of heat treated woods.

Zusammenfassung

Untersucht wurde die Möglichkeit, die Eigenschaften von wärmebehandeltem Kiefern- (Pinus pinaster) und Eukalyptusholz (Eucalyptus globulus) mit Hilfe von NIR-Spektroskopie zu bestimmen. Dabei wurde das Holz auf zwei verschiedene Arten wärmebehandelt, im Ofen und im Autoklaven. Masseverlust, Gleichgewichtsfeuchte, Dimensionsstabilität, Elastizitätsmodul, Biegefestigkeit, CIELAB Farbparameter und Extraktstoffgehalt wurden bestimmt. Die NIR-Spektren wurden mit einer Fasersonde auf der radialen Oberfläche der Prüfkörper ermittelt. NIR-Modelle zur Bestimmung des Masseverlusts ergaben ein sehr hohes Bestimmtheitsmaß (R2) von 96–98%. Die für die Holzeigenschaften ermittelten Modelle waren generell gut. Das Bestimmtheitsmaß für die Gleichgewichtsfeuchte lag zwischen 78–95%, für die Dimensionsstabilität zwischen 53–78%, für den Elastizitätsmodul zwischen 47–89%, für die Biegefestigkeit zwischen 75–77% und für die Farbparameter L, a* und b* zwischen 84–99%, 52–96% sowie 66–98%. Das Bestimmtheitsmaß für den Extraktstoffgehalt von Kiefernholz schwankte zwischen 41.9–79.8% und das von Eukalyptusholz zwischen 35.3–82.2%. Die NIR-Spektroskopie erwies sich somit als ein gut geeignetes Verfahren zur Qualitätskontrolle und Beurteilung von wärmebehandeltem Holz.

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Authors and Affiliations

  1. Centro de Estudos em Educação, Tecnologias e Saúde, ESTV, Instituto Politécnico de Viseu, Av. Coronel José Maria V. de Andrade, Campus Politécnico, 3504-510, Viseu, Portugal

    Bruno Esteves

  2. Centro de Estudos Florestais, Instituto Superior de Agronomia, Universidade Técnica de Lisboa, Tapada da Ajuda, 1349-017, Lisboa, Portugal

    Helena Pereira

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  1. Bruno Esteves
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  2. Helena Pereira
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Correspondence to Bruno Esteves.

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Esteves, B., Pereira, H. Quality assessment of heat-treated wood by NIR spectroscopy . Holz Roh Werkst 66, 323–332 (2008). https://doi.org/10.1007/s00107-008-0262-4

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