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Wettability of sapwood and heartwood of thermally modified Norway spruce and Scots pine

Benetzbarkeit von thermisch behandeltem Fichten- und Kiefernsplint- und -kernholz

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Abstract

In this research, the effect of thermal modifications at 170°C, 190°C, 210°C and 230°C on the wettability of sapwood and heartwood of Scots pine (Pinus sylvestris) and Norway spruce (Picea abies) was studied by measuring the static contact angles of distilled water on the surfaces as a function of time. The results were compared to industrially kiln-dried reference samples. The thermal modification at the lower temperatures of 170°C and 190°C increased the wettability of all wood materials with the exception of the heartwood of pine that had been thermally modified at 170°C, which was the most water-repellent material in the whole study. Thermal modification at the very high temperature of 230°C was needed to decrease the wettability of wood. The differences in water repellency between sapwood and heartwood were greater for pine than for spruce.

Zusammenfassung

In dieser Studie wird der Einfluss einer thermischen Behandlung bei 170°C, 190°C, 210°C und 230°C auf die Benetzbarkeit von Splint- und Kernholz der Kiefer (Pinus sylvestris) und der Fichte (Picea abies) untersucht. Dazu wurde der statische Kontaktwinkel von destilliertem Wasser auf der Oberfläche in Abhängigkeit der Zeit bestimmt und die Ergebnisse wurden mit technisch getrockneten Kontrollproben verglichen. Bei allen untersuchten Prüfkörpern führte eine thermische Behandlung bei den niedrigeren Temperaturen von 170°C und 190°C zu einem Anstieg der Benetzbarkeit, mit Ausnahme von Kiefernkernholz bei 170°C, dem am meisten hydrophoben Holz der gesamten Untersuchung. Erst bei der höchsten Behandlungstemperatur von 230°C konnte die Benetzbarkeit von Holz reduziert werden. Bei Kiefernholz war der Unterschied in der Wasserabweisung zwischen Splint- und Kernholz größer als bei Fichte.

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Acknowledgements

The foundation of Emil Aaltonen is gratefully acknowledged for its financial support. Soili Takala and Hanna Iitti are acknowledged for their practical work and classification of the results in connection with the contact angle measurements.

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  1. VTT Technical Research Centre of Finland, P.O. Box 1000, 02044 VTT, Espoo, Finland

    Sini Metsä-Kortelainen & Hannu Viitanen

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  1. Sini Metsä-Kortelainen
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  2. Hannu Viitanen
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Correspondence to Sini Metsä-Kortelainen.

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Metsä-Kortelainen, S., Viitanen, H. Wettability of sapwood and heartwood of thermally modified Norway spruce and Scots pine. Eur. J. Wood Prod. 70, 135–139 (2012). https://doi.org/10.1007/s00107-011-0523-5

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