Simultaneous treatment with oil heat and densification on physical properties of Populus × canadensis wood


  • Antonio Villasante
  • Santiago Vignote
  • Alvaro Fernandez-Serrano
  • Rubén Laina


Age of the oil, compression-set, olive oil, springback, wood density


Samples of wood from Populus × canadensis (9,5 % moisture) were treated with olive oil at 195 °C simultaneously with 15 % or 30 % compression densification, and the results were compared with samples subjected to oil heat treatment without densification, and control samples. The density of the treated samples increased by 18 %, 43 % and 1,5 % respectively, and barely changed over the six subsequent months stored inside the laboratory room (at approximately 65 % RH, 20 °C).  This was due to the fact that the slight weight increment caused by the additional moisture content was offset by the increase in volume from the springback effect. When subjected to atmospheres with different relative humidities, the treated samples stabilised at the same time as the control samples, although the treated samples had a significantly lower moisture absorption than the control samples. It was also observed that the hygroscopic shrinkage in  oil heat densification treatment samples was approximately half those of the control samples. The initial densification was partially lost as a result of springback: approximately 3 % in the first springback at a relative humidity of 65 % RH, and an additional 4 % in the second springback to a relative humidity of 85 % RH. Once this latter relative humidity had been attained, no new losses in densification were observed. The ageing of the oil used in the treatment caused a slight loss of densification in the densest samples.


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AITIM. 1997. Especies de maderas para carpintería, construcción y mobiliario. Asociación de Investigación Técnica de Industrias de la Madera y Corcho (AITIM), Madrid, Spain.

Bak, M.; Nemeth, R. 2012. Modification of wood by oil heat treatment. In Proceedings of the International Scientific Conference on Sustainable Development & Ecological Footprint. Sopron, Hungary.

Dubey, M.K.; Pang, S.; Walker, J. 2011. Effect of oil heating age on colour and dimensional stability of heat treated Pinus radiata. Eur J Wood Prod 69: 255–262.

Dubey, M.K.; Pang, S.; Walker, J. 2012a. Changes in chemistry, color, dimensional stability and fungal resistance of Pinus radiata D. Don wood with oil heat-treatment. Holzforschung 66(1): 49–57.

Dubey, M.K., Pang, S.; Walker, J. 2012b. Oil uptake by wood during heat-treatment and post-treatment cooling , and effects on wood dimensional stability. Eur J Wood Prod 70: 183–190.

Dubey, M. K.; Pang, S.; Chauhan, S.; Walker, J. 2016. Dimensional stability, fungal resistance and mechanical properties of radiata pine after combined thermo-mechanical compression and oil heat-treatment. Holzforschung 70(8): 793–800.

European Committee for Standardization. 2002. EN 13183-1: Moisture content of a piece of sawn timber. Part 1: Determination by oven dry method. CEN. Brussels, Belgium.,FSP_ORG_ID:7839,6156&cs=100F48F7330BA2CCD26D59BF5D87DFAD5

Fang, C.H.; Cloutier, A.; Blanchet, P.; Koubaa, A.; Mariotti, N. 2011. Densification of wood veneers combined with oil- heat treatment. part I: dimensional stability. BioResources 6(1): 373–385.

Forest Products Laboratory. 2010. Wood handbook—Wood as an engineering material. Forest Products Laboratory, Department of Agriculture, Madison, WI, USA.

Fullana, A.; Carbonell-Barrachina, A.A.; Sidhu, S. 2004. Comparison of volatile aldehydes present in the cooking fumes of extra virgin olive, olive, and canola oils. J Agric Food Chem 52(16): 5207–5214.

Gašparík, M.; Gaff, M.; Šafaříková, L.; Vallejo, C.R.; Svoboda, T. 2016. Impact bending strength and Brinell hardness of densified hardwoods. BioResources 11(4): 8638–8652.

Hsu, W.E.; Schwald, W.; Schwald, J. 1988. Chemical and physical changes required for producing dimensionally stable wood-based composites. Wood Sci Technol 22: 281–289.

Istok, I.; Sedlar, T.; Sefc, B.; Sinkovic, T.; Perkovic, T. 2016. Physical Properties of Wood in Poplar Clones ’I-214’ and ’S1-8’. Drv Ind 67(2): 163–170.

Jalaludin, Z.; Hill, C.A.S.; Samsi, H.W., Husain, H.; Xie, Y. 2010. Analysis of water vapour sorption of oleo-thermal modified wood of Acacia mangium and Endospermum malaccense by a parallel exponential kinetics model and according to the Hailwood-Horrobin model. Holzforschung 64(6): 763–770.

Kamke, F.A. 2006. Densified radiata pine for structural composites. Maderas-Cienc Tecnol 8(2): 83–92.

Kawai, S.; Wang, Q.; Sasaki, H.; Tanahashi, M. 1992. Production of compressed laminated veneer lumber by steam pressing. In Proceedings of the Pacific Rim Bio-Based Composites Symposium, Rotorua, New Zealand. pp. 121–128.

Kollmann, F. 1959. Tecnología de la madera y sus aplicaciones. Vol I. 1st edition. Instituto Forestal de Investigaciones y Experiencias y Servicio de la Madera, Madrid, Spain.

Kollmann, F.P.; Kuenzi, E.W.; Stamm, A.J. 1975. Principles of wood science and technology. Vol. II Wood based materials. 1st edition. Springer-Verlag, New York-Heidelberg-Berlin.

Kutnar, A.; Kamke, F.A.; Sernek, M. 2008. The mechanical properties of densified VTC wood relevant for structural composites. Holz Roh Werkst 66: 439–446.

Kutnar, A.; Sernek, M. 2007. Densification of wood. Zbornik Gozdarstva in Lesarstva 82: 53–62.

Laborie, M.P.G. 2006. The temperature dependence of wood relaxations: A molecular probe of the woody cell wall. In: Proceedings of the Characterization of the Cellulosic Cell Wall, Blackwell Publishing, Grand Lake, Colorado, USA. pp 87–94.

Laskowska, A. 2020. Impact of cyclic densification on bending strength and modulus of elasticity of wood from temperate and tropical zones. BioResources 15(2): 2869–2881.

Lee, S.H.; Ashaari, Z.; Lum, W.C.; Halip, J.A.; Ang, A.F.; Tan, L.P.; Chin, K.L.;Tahir, P.M. 2018. Thermal treatment of wood using vegetable oils : A review. Constr Build Mater 181: 408–419.

Li, X.; Bremer, G.C.; Connell, K.N.; Ngai, C.; Pham, Q.A.T.; Wang, S.; Flynn, M.; Ravetti, L.; Guillaume, C.; Wang, Y.; Wang, S.C. 2016. Changes in chemical compositions of olive oil under different heating temperatures similar to home cooking. Journal of Food Chemistry and Nutrition, 4(1): 07–15.

Lyon, F.; Thevenon, M.F.; Hwang, W. J.; Imamura, Y.; Gril, J.; Pizzi, A. 2007. Effect of an oil heat treatment on the leachability and biological resistance of boric acid impregnated wood. Ann For Sci 64: 673–678.

Morsing, N. 1998. Densification of wood - The influence of hygrothermal treatment on compression of beech perpendicular to the grain (Series R, N 79). Department of Structural Engineering and Materials, Technical University of Denmark, Lyngby, Denmark.

Navi, P.; Girardet, F. 2005. Effects of thermo-hydro-mechanical treatment on the structure and properties of wood. Holzforschung 54(3): 287–293.

Okon, K.E.; Lin, F.; Lin, X.; Chen, C.; Chen, Y.; Huang, B. 2018. Modification of chinese fir (Cunninghamia lanceolata L.) wood by silicone oil heat treatment with micro-wave pretreatment. Eur J Wood Prod 76: 221–228.

R Core Team. 2019. R: A language and environment for statistical computing. Version 3.6.1. R Foundation for Statistical Computing, Vienna, Austria. Retrieved from

Rapp, A.O. 2001.Review on heat treatments of wood. In: Proceedings of the Special Seminar COST E22, Antibes, France.

Reiterer, A.; Stanzl-Tschegg, S.E. 2001. Compressive behaviour of softwood under uniaxial loading at different orientations to the grain. Mech Mater 33(12): 705–715.

Song, J.; Chen, C.; Zhu, S.; Zhu, M.; Dai, J.; Ray, U.; Li, Y.; Kuang, Y.; et al. 2018. Processing bulk natural wood into a high-performance structural material. Nature 554: 224–228.

Sotomayor, J.R. 2016. Efecto del densificado de la madera de Gyrocarpus americanus Jacq . en su módulo dinámico determinado por ondas de esfuerzo [Effect of the densified of Gyrocarpus americanus Jacq. wood in its dynamic modulus established by stress waves]. Ciencia Amazónica 6(2): 162–171.

Spear, M.; Walker, J.C.F. 2006. Dimensional instability in timber. In: Primary Wood Processing, Principles and Practice, J.C.F. Walker (Ed). Springer, Dordrecht, Netherlands. pp. 95–120.

Tomak, E.D.; Hughes, M.; Yildiz, U.C.; Viitanen, H. 2011. The combined effects of boron and oil heat treatment on beech and Scots pine wood properties. Part 1: Boron leaching, thermogravimetric analysis, and chemical composition. J Mater Sci 46: 598–607.

Wang, J.Y.; Cooper, P.A. 2005. Effect of oil type, temperature and time on moisture properties of hot oil-treated wood. Holz Roh Werkst 63: 417–422.

Wehsener, J.; Brischke, C.; Meyer-Veltrup, L.; Hartig, J.; Haller, P. 2018. Physical, mechanical and biological properties of thermo-mechanically densified and thermally modified timber using the Vacu3-process. Eur J Wood Prod 76: 809–821.

Welzbacher, C.R.; Wehsener, J.; Rapp, A.O.; Haller, P. 2008. Thermo-mechanical densification combined with thermal modification of Norway spruce (Picea abies Karst) in industrial scale – Dimensional stability and durability aspects. Holz Roh Werkst 66: 39–49.




How to Cite

Villasante, A. ., Vignote, S., Fernandez-Serrano, A. ., & Laina, R. . (2021). Simultaneous treatment with oil heat and densification on physical properties of Populus × canadensis wood. Maderas-Cienc Tecnol, 24. Retrieved from




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