Abstract
The influence of microfibril angle (MfA), density and chemical cell wall composition on shrinkage varied between the longitudinal and tangential directions as well as between wood types, namely compression wood (CW), mature wood (MW) and juvenile wood (JW). At the same MfA, CW exhibited a lower tangential shrinkage than JW, indicating the influence of the chemical composition on wood shrinkage. The chemical composition measured via FTIR micro-spectroscopy has been shown in conjunction with density to be an alternative to MfA data for shrinkage predictions. This was particularly true for wood of young cambial age for which the MfA did not correlate to shrinkage. The results indicate a possibility to reduce distortion of sawn timber by segregation using infrared (IR) and X-ray in-line measurements.
Zusammenfassung
Der Einfluss des Mikrofibrillenwinkels (MfA), der Rohdichte und der chemischen Zusammensetzung der Zellwand auf das Schwindverhalten variiert sowohl zwischen longitudinaler und tangentialer Richtung als auch zwischen Druckholz (CW), juvenilem (JW) und adultem Holz (MW). Die geringere Tangentialschwindung von CW im Vergleich zu JW bei gleichem MfA weist auf den Einfluss der chemischen Zellwandzusammensetzung auf das Schwindverhalten hin. Es konnte gezeigt werden, dass die chemische Zellwandzusammensetzung, gemessen mittels Mikro-FTIR-Spektroskopie, eine Alternative zum MfA für die Vorhersage des Schwindmaßes darstellt. Dies galt insbesondere für JW, für welches keine Korrelation zwischen Schwindmaß und MfA gefunden wurde. Diese Ergebnisse zeigen eine Möglichkeit zur Reduzierung der Verformung von Schnittholz durch Sortierung basierend auf Infrarot- und Röntgenmessungen.
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Leonardon, M., Altaner, C.M., Vihermaa, L. et al. Wood shrinkage: influence of anatomy, cell wall architecture, chemical composition and cambial age . Eur. J. Wood Prod. 68, 87–94 (2010). https://doi.org/10.1007/s00107-009-0355-8
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DOI: https://doi.org/10.1007/s00107-009-0355-8