Abstract
The study was conducted to determine the physical and mechanical properties as follows: modulus of rupture, modulus of elasticity, internal bond, thickness swelling and water absorption of oriented strand lumber (OSL) made from the Asian bamboo Dendrocalamus asper Backer. Thirty-six lab boards were produced from these bamboo strands with two manufacturing parameters varying, i.e., four resin types (MF, MUPF, PF, and pMDI) and three levels of resin content (7, 10, and 13%). The results indicate that OSL made from bamboo strands exhibits superior strength properties compared to the commercial products made from wood for the building sector. The resin type has a significant effect on board properties. Moreover, all properties of the board improve generally with increasing resin content. With regard to the internal bond, bamboo-based OSL shows less strength than wood-based boards. The best results were obtained by using 13% pMDI content at 750 kg\( / \)m3 density.
Zusammenfassung
Ziel der Studie war die Bestimmung folgender physikalischer und mechanischer Eigenschaften von Furnierstreifenholz (Oriented Strand Lumber -OSL) aus der asiatischen Bambusart Dendrocalamus asper Backer: Biegefestigkeit, Elastizitätsmodul, Querzugfestigkeit, Dickenquellung und Wasseraufnahme. Im Technikum wurden 36 Platten aus Bambusflachspänen (Strands) hergestellt, wobei zwei der Herstellungsparameter, d. h. Bindemitteltyp und -anteil, variiert wurden. Verwendet wurden vier verschiedene Bindemittel (MF, MUPF, PF und pMDI) in jeweils drei verschiedenen Beleimgraden (7, 10, 13%). Die Ergebnisse zeigen, dass OSL aus Bambusstrands bessere Festigkeitseigenschaften aufweist als aus Holz gefertigte, kommerziell erhältliche Produkte für den Baubereich. Der Bindemitteltyp hat einen signifikanten Einfluss auf die Platteneigenschaften. Generell verbessern sich die untersuchten Eigenschaften mit der Erhöhung des Bindemittelanteils. Die Querzugfestigkeit von OSL aus Bambus ist geringer als die von holzbasierten Platten. Die besten Eigenschaften wurden mit dem Einsatz von 13% pMDI bei einer Rohdichte von 750 kg\( / \)m3 erzielt.
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Acknowledgements
The authors gratefully acknowledge the German Academic Exchange Service (DAAD), the Von Thünen Federal Research Institute Hamburg and the Department of Wood Science University of Hamburg for the available research equipment and financial support. Also a special thank goes to the Wood Science and Engineering Research Unit, Walailak University, Thailand for providing the raw material and facilities for the experimental work.
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Malanit, P., Barbu, M.C. & Frühwald, A. Physical and mechanical properties of oriented strand lumber made from an Asian bamboo (Dendrocalamus asper Backer). Eur. J. Wood Prod. 69, 27–36 (2011). https://doi.org/10.1007/s00107-009-0394-1
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DOI: https://doi.org/10.1007/s00107-009-0394-1