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Effect of high-temperature drying on properties of Norway spruce and larch

Einfluss von Hochtemperaturtrocknung auf Eigenschaften von Fichte und Lärche

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Abstract

In timber drying, mechanical properties may be changed due to treatment temperature and treatment duration. In general, when increasing the kiln temperature, drying time is decreased and some timber properties are negatively affected. In this study, the effect of different drying temperatures (80, 120 and 170 °C) on equilibrium moisture content and sorption rate, on bending strength and stiffness was investigated for Norway spruce and larch from four proveniences and the results were compared to those obtained for heat-treated wood (Thermowood

®). The experiments confirm earlier research that both treatment temperature and treatment duration affect the properties. High-temperature drying or treatment can be optimized for several applications, yielding strong but not so durable timber or vice versa.

Zusammenfassung

Bei der Holztrocknung können Änderungen der Holzeigenschaften aufgrund von Behandlungstemperatur und -dauer auftreten. Erhöhte Trocknungstemperaturen führen im Allgemeinen zu einer Verkürzung der Trockendauer und einer negativen Beeinflussung einiger Eigenschaften. Die vorliegende Studie behandelt die Auswirkung unterschiedlicher Trocknungstemperaturen (80, 120 und 170 °C) auf Gleichgewichtsfeuchte, Sorptionsrate, Biegefestigkeit und -steifigkeit in Fichte und Lärche unterschiedlicher Herkunft und vergleicht diese Ergebnisse mit denen von wärmebehandeltem Holz (Thermowood

®). Die Versuche bestätigen die Ergebnisse früherer Untersuchungen in der Hinsicht, dass sowohl Trocknungstemperatur als auch Trocknungsdauer die Holzeigenschaften beeinflussen. Hochtemperaturtrocknung oder Wärmebehandlung kann für unterschiedliche Anwendungszwecke optimiert werden, um Holz mit hoher Festigkeit und weniger guter Dauerhaftigkeit oder umgekehrt zu produzieren.

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  1. Division of Structural Engineering, Lund Institute of Technology, Lund University, Lund, Sweden

    Eva Frühwald

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  1. Eva Frühwald
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Correspondence to Eva Frühwald.

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Frühwald, E. Effect of high-temperature drying on properties of Norway spruce and larch . Holz Roh Werkst 65, 411–418 (2007). https://doi.org/10.1007/s00107-007-0174-8

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  • DOI: https://doi.org/10.1007/s00107-007-0174-8

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