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The effect of log heating temperature on the peeling process and veneer quality: beech, birch, and spruce case studies

Einfluss der Aufheiztemperatur des Rundholzes auf den Schälprozess und die Furnierqualität am Beispiel von Buche, Birke und Fichte

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Abstract

Heating green-wood prior to peeling is necessary to improve both peeling process and quality of veneer. This study investigates optimum heating temperatures by soaking of beech, birch and spruce. Experiments have studied the influence of heating temperatures from 20 to 80 °C on thickness deviations and veneer lathe checking using a pneumatic rugosimeter and image analysis of opening checks with the SMOF device (Système de Mesure de l’Ouverture des Fissures). Conclusions account for reduced heating temperatures compared to the temperatures currently in-use in the industry. Already at 50 °C, positive effects of heating ensure efficient peeling process. Low temperatures produce veneers with deeper and more spaced checks than high temperatures when checks are closer and less deep, becoming even unpredictable especially in case of spruce. These results establish the SMOF as an essential non-destructive control device to control the quality of the veneer produced at research level.

Zusammenfassung

Um den Schälprozess und die Qualität von Furnier zu verbessern, muss das Rundholz vor dem Schälen aufgeheizt werden. Dieser Artikel beschäftigt sich mit der Untersuchung der optimalen Aufheiztemperatur bei der Wässerung von Buche, Birke und Fichte. Unter Verwendung eines druckluftbetätigten Rugosimeters und digitaler Bildanalyse mittels SMOF-Apparat wurde der Einfluss einer Temperatur zwischen 20 und 80 °C auf die Dickenschwankungen und Risse der Furniere untersucht. Die Ergebnisse zeigen, dass die aktuell in der Industrie verwendeten Temperaturen reduziert werden könnten. Schon bei 50 °C kann ein effizienter Schälprozess erreicht werden. Bei niedrigeren Temperaturen treten tiefere Risse in größerem Abstand auf. Im Vergleich dazu sind bei höheren Temperaturen der Abstand und die Tiefe der Risse geringer, beim Schälen von Fichte sogar kaum meßbar. Die Ergebnisse zeigen, dass der SMOF-Apparat zur zerstörungsfreien Qualitätsprüfung von Furnieren im Rahmen von Forschungsarbeiten geeignet ist.

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Authors and Affiliations

  1. Arts et Metiers ParisTech LaBoMaP, Rue Porte de Paris, 71250, Cluny, France

    Anna Dupleix, Louis-Etienne Denaud, Laurent Bleron & Rémy Marchal

  2. Department of Forest Products Technology, School of Chemical Technology, Aalto University, 00076, Aalto, Finland

    Anna Dupleix & Mark Hughes

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  1. Anna Dupleix
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  2. Louis-Etienne Denaud
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  3. Laurent Bleron
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  4. Rémy Marchal
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  5. Mark Hughes
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Correspondence to Anna Dupleix.

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Dupleix, A., Denaud, LE., Bleron, L. et al. The effect of log heating temperature on the peeling process and veneer quality: beech, birch, and spruce case studies. Eur. J. Wood Prod. 71, 163–171 (2013). https://doi.org/10.1007/s00107-012-0656-1

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  • DOI: https://doi.org/10.1007/s00107-012-0656-1

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