Abstract
This research is part of a general study on the properties of oriented strandboard (OSB) using wood strands of species from Brazilian planted forests. The OSB industry is the latest wood related activity established in Brazil. In this particular part of the study, 80 mm long strands of Pinus taeda L. were bonded using two resin types (urea-formaldehyde and phenol-formaldehyde) at two levels of resin content (5% and 8%) to produce three-layer cross-aligned OSB to a face to core layer ratio of 1:2 and target density of 0.75 g/cm3. Physical and mechanical properties of the boards were evaluated according to ASTM standard D 1037-96a (1997) and the results compared to standards available as requirements for commercial structural panels. The results indicate that all the mechanical properties evaluated were above the requirements set forth by the Canadian standard CSA O437.0 (1993) for structural panels. The results of Janka hardness were in average 4 folds higher than the minimal requirements for Grade R-1 waferboard. Screw withdrawal values were also above the minimum required by grade M-3 of ANSI A208.1 standard (1993). Nevertheless, values of thickness swelling and water absorption were very high. The low dimensional stability may be related to the high density of the boards (“springback” effect) and also to the fact that no wax was used.
Zusammenfassung
Diese Arbeit ist Teil einer allgemeinen Studie über die Eigenschaften von OSB, die aus Holzsträngen unter Verwendung von Spezialhölzern aus brasilianischen Wäldern hergestellt wurden. Die OSB-Industrie ist die neueste holzbezogene Einrichtung in Brasilien. In diesem besonderen Teil der Studie, wurden 80 mm lange Späne von Pinus taeda L. mit zwei Klebertypen (Harnstoff- und Phenolformaldehyd) zusammengefügt zu zwei Stufen des Harzgehalts (5% und 8%), um dreilagige überkreuzte OSBs herzustellen und ein Verhältnis von 1:2 und eine Zieldichte von 0,75 g/cm3 zu erhalten. Physikalische und mechanische Eigenschaften der Platten wurden nach dem ASTM Standard D 1037-96a abgeschätzt und die Ergebnisse verglichen mit den Standards, die verfügbar sind als Erfordernis für kommerzielle Bauplatten. Die Ergebnisse der Janka-Härte waren im Durchschnitt 4-mal höher als die Minimalerfordernisse für Grad R-1 waferboards. Schraubenwiderstandswerte lagen ebenfalls über den Minimalerfordernissen des Grad M-3 von ANSI A208.1 Standards. Jedoch waren die Werte der Dickenquellung und der Wasseraufnahme sehr hoch. Die Dimensionsstabilität könnte mit der hohen Dichte der Platten („springback“-Effekt) und auch mit der Tatsache, dass kein Wachs verwendet wurde zusammenhängen.
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References
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Acknowledgements
The authors gratefully thank Mr. Roberto Trevisan from Placas do Paraná S.A. and Mr. Mário de Andrade from Alba Química Ltda., for donating the wood and resins, respectively, used in this study. Thanks are also extended to the technicians João Anacleto, Sérgio Martinez, and Getúlio Almeida.
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Okino, E.Y.A., Teixeira, D.E., de Souza, M.R. et al. Properties of oriented strandboard made of wood species from Brazilian planted forests: Part 1: 80 mm-long strands of Pinus taeda L.. Holz Roh Werkst 62, 221–224 (2004). https://doi.org/10.1007/s00107-004-0472-3
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DOI: https://doi.org/10.1007/s00107-004-0472-3