Effect of Vacuum Heat Treatment Temperature on Physical and Mechanical Properties of <i>Eucalyptus Pellita</i> Wood


  • Wang Xue-hua
  • Fei Ben-hua
  • Liu Jun-liang


<i>Eucalyptus pellita</i>, vacuum heat treatment, physical property, modulus of elasticity, modulus of rupture


This study investigated how vacuum heat treatment influenced the physical and mechanical properties of Eucalyptus pellita wood. The investigated properties included mass loss, oven-dry density, dimensional stability, modulus of elasticity (MOE), and modulus of rupture (MOR). For the study, wood samples were heated under vacuum atmosphere at temperatures ranging from 80 to 280°C for 4 h. The results showed that although the mass loss of wood showed only a slight change below 200°C, there was a sharp increase in loss after 240°C. Oven-dry density of wood decreased slowly with an increase of treatment temperature with decreases of 4.4 and 10.4% compared with the control sample observed at 200 and 240°C, respectively. Conversely, the dimensional stability of samples increased by about 30% at 200°C. As temperatures increased, MOE and MOR initially showed gradual enhancements before declining rapidly. Compared with the untreated sample, MOE increased by 25.2% at 200°C, whereas MOR augmented by 6.5% at 160°C. Vacuum heat treatment temperature between 160 and 200°C would be available for improving dimensional stability and keeping mechanical strength of Eucalyptus pellita wood.


Boonstra M (2008) A two-stage thermal modification of wood. PhD thesis in Applied Biological Sciences: Soil and Forest Management. Henry Poincaré University-Nancy, Nancy, France.nBoonstra MJ, Tjeerdsma B (2006) Chemical analysis of heat treated softwoods. Holz Roh Werkst 64(3):204-211.nBourgois J, Guyonnet R (1988) Characterization and analysis of torrefied wood. Wood Sci Technol 22(2):143-155.nBurmester A (1973) Investigation on the dimensional stabilization of wood. BundesanstaltfürMaterialprüfung, Berlin, Germany. Pages 50-56.nChinese standard (2009a) GB/T 1932. Method for determination of the shrinkage of wood. Beijing, China.nChinese standard (2009b) GB/T 1933. Method for determination of the density of wood. Beijing, China.nChinese standard (2009c) GB/T 1934.2. Method for determination of the swelling of wood. Beijing, China.nChinese standard (2009d) GB/T 1936.1. Method of testing in bending strength of wood. Beijing, China.nChinese standard (2009e) GB/T 1936.2. Method for determination of the modulus of elasticity in static bending of wood. Beijing, China.nDing T, Gu LB, Wu H (2010) Influence of steam pressure on mechanical properties of heat-treated wood. China Forest Products Industry 37(1):16-18 (in Chinese).nEsteves B, Domingos I, Pereira H (2006) Variation of dimensional stability and durability of eucalypt wood by heat treatment. Pages 185-194 in 2nd International Conference on Environmentally-Compatible Forest Products, 20-22 September 2006, Oporto, Portugal.nEsteves B, Domingos I, Pereira H (2007a) Improvement of technological quality of eucalypt wood by heat treatment in air at 170-200°C. Forest Prod J 57(1/2):47-52.nEsteves B, Marques AV, Domingos I, Pereira H (2007b) Influence of steam heating on the properties of pine (Pinuspinaster) and Eucalyptus (Eucalyptususglobulus) wood. Wood Sci Technol 41(3):193-207.nEsteves BM, Domingos IJ, Pereira HM (2008) Pine wood modification by heat treatment in air. Bioresources 3(1):142-154.nEsteves BM, Pereira HM (2009) Wood modification by heat treatment: A review. Bioresources 4(1):370-404.nGosselink RJA, Krosse AMA, Van der Putten JC, Van der Kolk JC, de Klerk-Engels B, Van Dam JEG (2004) Wood preservation by low-temperature carbonisation. Ind Crops Prod 19(1):3-12.nHofmann T, Rétfalvi T, Albert L, Niemz P (2008) Investigation of the chemical changes in the structure of wood thermally modified within a nitrogen atmosphere autoclave. Wood Research 53(3):85-98.nInoue M, Ogata S, Nishikawa M, Otsuka Y, Kawai S, Norimoto M (1993) Dimensional stability, mechanical properties, and color changes of a low molecular weight melamine-formaldehyde resin impregnated wood. Mokuzai Gakkaishi 39(2):181-189.nKollmann F (1936) Technologie des Holzes und der Holzwerkstoffe. Springer Verlag, Berlin, Germany.nKorkut DS, Guller B (2008) The effects of heat treatment on physical properties and surface roughness of red-bud maple (Acer trautvetteri Medw.) wood. Biores Technol 99(8):2846-2851.nKubojima Y, Okano T, Ohta M (2000) Bending strength and toughness of heat-treated wood. J Wood Sci 46(1):8-15.nManoj KD, Shusheng P, John W (2012) Changes in chemistry, color, dimensional stability and fungal resistance of Pinus radiata D. Don wood with oil heat-treatment. Holzforschung 66(1):49-57.nMburu F, Dumarçay S, Bocquet JF, Petrissans M, Gérardin P (2008) Effect of chemical modifications caused by heat treatment on mechanical properties of Grevillearobusta wood. Polym Degrad Stabil 93(2):401-405.nMilitz H, Tjeerdsma B (2001) Heat treatment of wood by the ‘PLATO-Process.’ Review on heat treatments of wood. Pages 23-34 in Proc Special Seminar, Forestry and Forestry Products, Antibes, France. COST Action E22, 9 February 2001, European Commission Research Directorate, Political Co-Ordination and Strategy, Brussels, Belgium.nMitchell PH (1988) Irreversible property changes of small loblolly pine specimens heated in air, nitrogen, or oxygen. Wood Fiber Sci 20(3):320-335.nNuopponen M, Vuorinen T, Jämsä S, Viitaniemi P (2005) Thermal modifications in softwood studied by FT-IR and UV resonance Raman spectroscopies. J Wood Chem Technol 24(1):13-26.nPoncsák S, Kocaefe D, Bouazara M, Pichette A (2006) Effect of high temperature treatment on the mechanical properties of birch (Betulapapyrifera). Wood Sci Technol 40(8):647-663.nRapp A (ed.) (2001) Review on heat treatments of wood. COST ACTION E22-Environmental optimization of wood protection. Proc Special Seminar in Antibes, France, 9 February 2001, European Commission Research Directorate, Political Co-Ordination and Strategy, Brussels, Belgium.nRowell RM, Ibach RE, McSweeny J, Nilsson T (2009) Understanding decay resistance, dimensional stability and strength changes in heat-treated and acetylated wood. Wood Material Science and Engineering 4(1-2):14-22.nSeborg RM, Millett MA, Stamm AJ (1945) Heat-stabilized compressed wood (Staypack). Mech Eng 67(1):25-31.nShi JL, Kocaefe D, Zhang J (2007) Mechanical behaviour of Québec wood species heat-treated using ThermoWood process. Holz Roh Werkst 65(4):255-259.nSrinivas K, Pandey KK (2012) Effect of heat treatment on color changes, dimensional stability, and mechanical properties of wood. J Wood Chem Technol 32(4):304-316.nTaghiyari HR (2011) Study on the effect of nano-silver impregnation on mechanical properties of heat-treated Populus nigra. Wood Sci Technol 45(2):399-404.nUnsal O, Ayrilmis N (2005) Variations in compression strength and surface roughness of heat-treated Turkish river red gum (Eucalyptus camaldulensis) wood. J Wood Sci 51(4):405-409.nWang JY, Zhao GJ, Takato N (2001) Change of brightness, chromatism and infrared spectra of compressed China fir wood during heat treatment. Journal of Beijing Forestry University 23(1):57-62 (in Chinese).nWang M, Liu JL, Chai YB, Gao JM (2011) Properties of Cryptomeria fortunei after strengthening-inflaming retarding treatment. China Wood Industry 25(4):15-17 (in Chinese).nWeiland JJ, Guyonnet R (2003) Study of chemical modifications and fungi degradation of thermally modified wood using DRIFT spectroscopy. Holz Roh Werkst 61(3):216-220.nWikberg H, LiisaMaunu S (2004) Characterisation of thermally modified hard- and softwoods by 13C CPMAS NMR. Carbohyd Polym 58(4):461-466.nWindeisen E, Strobel C, Wegener G (2007) Chemical changes during the production of thermo-treated beech wood. Wood Sci Technol 41(6):523-536.nYildiz S, Gezer ED, Yilditz UC (2006) Mechanical and chemical behavior of spruce wood modified by heat. Build Environ 41(12):1762-1766.nYin SC (1996) Wood science. Chinese Forestry Publishing House, Beijing, China (in Chinese).nZhang YM, Yu YL, Yu WJ (2013) Effect of thermal treatment on the physical and mechanical properties of phyllostachyspubescen bamboo. Eur J Wood Wood Prod 71(1):61-67.n






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