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Color stability of heat-treated wood during artificial weathering

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Abstract

The color change of wood after exposure to UV light may produce aesthetical damages. The stability of the color to light exposure is an important issue. This study describes experiments of testing the color stability of heat-treated wood samples. Heat treatment was done at 240°C during 2 hours, under nitrogen. Heat-treated samples of ash, beech, maritime pine and poplar heartwood were exposed to UV-light (QUV equipped with fluorescent lamps UVA-340) during 835 hours. Color measurements during accelerated weathering were made at intervals throughout the test period. The results are presented in ΔE and L* a* b* coordinates according to the CIELab system. The experiments show that the color stability for heat-treated wood is better during the 835 hours of exposure when compared to untreated wood. The properties of heat treated wood (lignin modifications, and monomers of phenolic compounds) are probably involved in the retified wood resistance against UV light under experimental conditions.

Zusammenfassung

Farbveränderung bei Holz, das UV-Licht ausgesetzt wurde, kann ästhetische Schäden verursachen. Die Stabilität der dem Licht ausgesetzten Farbe ist ein wichtiges Thema. Diese Studie beschreibt Experimente zum Testen der Farbstabilität bei hitzebehandelten Holzproben. Die Hitzebehandlung wurde bei 240°C zwei Stunden lang unter Stickstoff durchgeführt. Die hitzebehandelten Holzproben von Eschen-, Buchen-, Kiefern- und Pappel-Kernholz wurden 835 Stunden lang UV-Licht ausgesetzt (QUV bestückt mit fluoreszierenden Lampen UVA-340). Farbmessungen während beschleunigter Bewitterung wurden in Intervallen durchgeführt. Die Ergebnisse werden in ΔE und L* a* b* Koordinaten gemäß dem CIELab-System dargestellt. Sie zeigen, dass die Farbstabilität bei hitzebehandeltem Holz während der 835 Stunden vergleichsweise besser ist als bei unbehandeltem Holz. Die Eigenschaften des hitzebehandelten Holzes (Ligninmodifikationen und monomere phenolische Bestandteile) sind wahrscheinlich an der Beständigkeit gegenüber UV-Licht unter experimentellen Bedingungen beteiligt.

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Authors and Affiliations

  1. Ecole Supérieure du Bois, rue Christian Pauc, 44 306, Nantes Cedex 03, France

    N. Ayadi & F. Lejeune

  2. Département Science et Génie des Matériaux orientation bois, Université de Pau et des Pays de l'Adour, 40 004, Mont de Marsan, France

    F. Charrier & B. Charrier

  3. LERMAB, Université Henri Poincaré, 54 500, Vandoeuvre les Nancy, France

    A. Merlin

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  1. N. Ayadi
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  2. F. Lejeune
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  3. F. Charrier
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  4. B. Charrier
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  5. A. Merlin
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Correspondence to B. Charrier.

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Ayadi, N., Lejeune, F., Charrier, F. et al. Color stability of heat-treated wood during artificial weathering. Holz Roh Werkst 61, 221–226 (2003). https://doi.org/10.1007/s00107-003-0389-2

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  • DOI: https://doi.org/10.1007/s00107-003-0389-2

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