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Comparison between heat treated sapwood and heartwood from Pinus pinaster

Vergleich von thermisch behandeltem Pinus pinaster Splint- und Kernholz

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Abstract

Sapwood and heartwood samples of Pinus pinaster were treated in an oven at 190 and 200 °C for 2–6 h. Dimensional stability, measured as Anti Shrinking Efficiency (ASE) between 0 and 65 % relative humidity, durability against fungi, mechanical resistance (MOE and MOR), hardness and chemical composition were determined for treated and untreated sapwood and heartwood. Radial ASE reached 52 % for sapwood and 50 % for heartwood, while tangential ASE reached 50 and 40 %, respectively. MOE increased slightly at the beginning of the treatment, decreasing afterwards. No significant differences were found between sapwood and heartwood. MOR decreased by 50 and 30 % for sapwood and heartwood, respectively. A significant increase in durability against Rhodonia placenta was found for both heartwood and sapwood at the higher temperature (200 °C), but at the lower temperature (190 °C) only heartwood showed good results.

Zusammenfassung

Pinus pinaster Splint- und Kernholzprüfkörper wurden in einem Ofen bei 190 und 200 °C für eine Dauer von 2–6 Stunden behandelt. Es wurde die Dimensionsstabilität als Schwindungsvergütung (ASE) zwischen 0 und 65 % rel. Luftfeuchte sowie die Dauerhaftigkeit gegen holzzerstörende Pilze, die mechanischen Eigenschaften (Elastizitätsmodul (MOE) und Biegefestigkeit (MOR)), die Härte und die chemische Zusammensetzung von behandeltem und unbehandeltem Splint- und Kernholz bestimmt. Die radiale Schwindungsvergütung von Splintholz betrug 52 % und von Kernholz 50 %; die tangentiale Schwindungsvergütung von Splintholz betrug 50 % und von Kernholz 40 %. Der Elastizitätsmodul nahm zu Behandlungsbeginn leicht zu und nahm anschließend ab. Bei Splint- und Kernholz zeigten sich keine signifikanten Unterschiede. Die Biegefestigkeit von Splintholz nahm um 50 % ab, die von Kernholz um 30 %. Sowohl Splint- als auch Kernholz wiesen bei der höheren Temperatur (200 °C) eine erhöhte Dauerhaftigkeit gegen den holzzerstörenden Pilz Rhodonia placenta auf, wogegen bei der niedrigeren Temperatur (190 °C) nur Kernholz gute Ergebnisse zeigte.

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Acknowledgments

The authors are grateful for the support of the Portuguese Foundation for Science and Technology (FCT) and Center for Studies in Education, Technologies and Health essential for the accomplishment of this work. The Forest Research Centre is funded by FCT.

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Authors and Affiliations

  1. Polytechnic Institute of Viseu, Portugal and Centre for the Study of Education, Technologies and Health (CI&DETS), Viseu, Portugal

    Bruno Esteves & Idalina Domingos

  2. National Laboratory for Civil Engineering (LNEC), Lisbon, Portugal

    Lina Nunes

  3. Timber Structures Division, Structures Department, Azorean Biodiversity Group (CITA-A), Platform for Enhancing Ecological Research and Sustainability (PEERS), Universidade dos Açores, Terceira, Azores, Portugal

    Lina Nunes

  4. Forest Research Centre (CEF), School of Agriculture, Technical University of Lisbon, Lisbon, Portugal

    Helena Pereira

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  1. Bruno Esteves
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  2. Lina Nunes
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  3. Idalina Domingos
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  4. Helena Pereira
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Correspondence to Bruno Esteves.

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Esteves, B., Nunes, L., Domingos, I. et al. Comparison between heat treated sapwood and heartwood from Pinus pinaster . Eur. J. Wood Prod. 72, 53–60 (2014). https://doi.org/10.1007/s00107-013-0751-y

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  • DOI: https://doi.org/10.1007/s00107-013-0751-y

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