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Wood surface discolouration due to simulated indoor sunlight exposure

Verfärbung von Holzoberflächen aufgrund von simulierter Sonneneinstrahlung im Innenraum

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Abstract

Wood surface colour is a very important quality criterion in the utilisation of wood, especially in indoor applications. In this study, an attempt was made to analyse wood surface discolouration due to artificial indoor light irradiation of the most frequently traded wood species in Europe altogether. Sixteen wood species, twelve hardwood and four softwood species, were exposed for 120 hours to a xenon-arc lamp equipped with a 3 mm window glass filter, in order to simulate natural sunlight behind a window glass. Eleven wood species were chosen and further exposed to irradiation for up to 600 hours. Colour measurements were performed by means of a colorimeter device on exposed and non-exposed areas of the samples. Using the CIE-L*a*b* colour measuring system, wood surface discolouration was measured and calculated according to ∆L*, ∆a*, ∆b* and ∆E* values. An idea of the different behaviour of these species and how they relate to each other could be given.

Zusammenfassung

Die Farbe von Holzoberflächen ist speziell im Innenraum ein wichtiges Qualitätskriterium. Es wurde versucht, die Verfärbung von Holzoberflächen aufgrund von simulierter Sonneneinstrahlung im Innerraum zu analysieren. Sechzehn der meist gehandelten Hölzer in Europa (12 Laubhölzer und 4 Nadelhölzer) wurden 120 Stunden mit einer Xenonlampe hinter einem 3 mm dicken Fensterglasfilter bestrahlt. Elf ausgewählte Hölzer wurden für weitere 480 Stunden bestrahlt. Es wurden Farbmessungen auf bestrahlten und abgedeckten Bereichen der Proben durchgeführt. Unter Verwendung des CIE-L*a*b* Farbsystems wurden die Verfärbungen entsprechend den Werten ∆L*, ∆a*, ∆b* and ∆E* analysiert. Das unterschiedliche Verhalten der wichtigsten europäischen Handelshölzer konnte so im direkten Vergleich dargestellt werden.

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Authors and Affiliations

  1. Institute of Wood Science and Technology, Department of Material Sciences and Process Engineering, University of Natural Sciences and Applied Life Sciences, Peter Jordan Strasse 82, 1190, Vienna, Austria

    Laura Oltean, Alfred Teischinger & Christian Hansmann

  2. Wood K plus – Competence Centre for Wood Composites and Wood Chemistry, St. Peter Strasse 25, 4021, Linz, Austria

    Alfred Teischinger & Christian Hansmann

Authors
  1. Laura Oltean
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  2. Alfred Teischinger
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  3. Christian Hansmann
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Correspondence to Christian Hansmann.

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Oltean, L., Teischinger, A. & Hansmann, C. Wood surface discolouration due to simulated indoor sunlight exposure . Holz Roh Werkst 66, 51–56 (2008). https://doi.org/10.1007/s00107-007-0201-9

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  • DOI: https://doi.org/10.1007/s00107-007-0201-9

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