پیوندهای مفید
آمار
| تعداد نشریات | 31 |
| تعداد شمارهها | 748 |
| تعداد مقالات | 7,129 |
| تعداد مشاهده مقاله | 10,281,991 |
| تعداد دریافت فایل اصل مقاله | 6,913,775 |
Influence of hydrothermal treatment on the dimensional stability of beech wood | ||
| Caspian Journal of Environmental Sciences | ||
| مقاله 9، دوره 5، شماره 2، تیر 2007، صفحه 125-131 اصل مقاله (180.39 K) | ||
| نویسندگان | ||
| P. Rezayati Charani* 1؛ J. Mohammadi Rovshandeh?2؛ B. Mohebby3؛ O. Ramezani4 | ||
| 1Department of paper product, Iran (Chouka) wood and paper Co. P.O.BOX 43841-111, Chouka, Rezvanshahr, Guilan, Iran. | ||
| 2Department of Chemical Engineering, Faculty of Engineering (campus 3 ), Tehran University P.O.BOX 43841-119, Rezvanshahr, Guilan, Iran. | ||
| 3Department of Wood & Paper Science and Technology, Faculty of Natural Resources & Marine Sciences, Tarbiat Modarres University, P.O. BOX 46414-356, Noor, Mazandaran, Iran. | ||
| 4Department of Wood and paper sciences and industries, Faculty of Natural Resources, Tehran University, P.O. BOX 31585, Karaj, Iran. | ||
| چکیده | ||
| Hydrothermal treatment of wood material products with many interesting properties such as enhanced dimensional stability, lower equilibrium moisture content and increased biological durability. The effects of hydrothermal treatment on dimensional stability, oven dry density and water absorption of beech wood (Fagus Orientalis) naturally grown, has been studied in present research that extremely used in Iran. Hydrothermal applied to the wood samples (2.5Cm × 2.5Cm × 2.5Cm) in three different temperatures (150 °C, 160 °C,170°C) and four different durations (1h, 3h, 5h and 7h) in reactor. Then, the samples and their controls were immersed in water at 25 °C, 65% relative humidity for various periods. Volumetric swelling percentage and rate of the water absorption values of the samples and their controls were measured at a period of 24 hour in 8 steps on basis of oven dried dimension. The obtained data were analyzed using Microsoft Office (EXCEL 2003). The data analysis indicated that best anti-swelling efficiency value was achieved at 170 oC (treating temperature) within 1 hour (treating time) and 8 steps of soaking - dried measurement by hydrothermal treatment. Consequences for anti-swelling efficiency, decreasing of samples specific gravity, water absorption and water repellency effectiveness values obtained 27.95%, 8.49%, 56.41% and 20.20% respectively. Therefore, hydrothermal treatment showed a little decreasing at 150 oC to 170oC in specific gravity of treatment samples because maximum lessening of specific gravity obtained 8.02% in the highest condition of treatment after final soaking. REFERENCES Brischke, C. and Rapp, A.O. (2004) Investigation of the suitability of silver fir (Abies alba Mill.) for thermal modification. IRG / WP 04- 40275, IRG Annual Meeting 6-10 June, SLOVENIA. Caparro´s, S., Ariza, J., Hernanz, D., Dı´az, M.J. and Arundo donax L. (2006) Valorization under Hydrothermal and Pulp Processing. Ind. Eng. Chem. Res., Vol. 45, No. 9. Hietala, S., Maunu, S.L., Sundholm, F., Jämsä, S., and Viitaniemi, P. (2002) Structure of Thermally Modified Wood Studied by Liquid State NMR Measurements. Holzforschung. 56, 522-528. Homan, W., Tjeerdsma, B., Beckers, E., Jorissen, A. (2000) Structural and other properties of modified wood, World Conference on Timber Engineering, Whistler Resort, British Columbia, Canada, July 31 - August 3, 2000. Inoue, M., Norimoto, M., Tanahashi, M., and Rowell, R.M. (1993) Steam or Heat Fixation of Compressed Wood, Wood and Fiber Science, 25, 224-235. Kotilainen, R. (2000) Chemical Changes in Wood During Heating at 150-260 ° PhD Thesis, Jyväskylä University, Research Repot 80, Finland. Kollmann, F. and A. Schneider (1963) Über das Sorptionsverhalten wärmebehandelter Hölzer. Holz als Roh- und Werkstoff 21, 77- 85. Militz, H., and Tjeerdsma, B. (2001) “Heat treatment of wood by the PLATOProcess” Review on Heat Treatments Wood, Rezayati et al., 131 Cost Action E 22, Proceeding of Special Seminar Held in Antibes, February, France, pp: 23-33. Rapp, A.O., Sailer, M. (2001) Oil-Heat treatment of wood in Germany – State of the art. European commission, DirectorateGeneral for Research EUR 19885, COST Action E22, Proceedings of Special Seminar, Antibes/France, 9 February 2001, pp. 47-64. Rapp, A.O., and Sailer, M. (2004) Oil Heat Treatment of Wood in Germany – State of the art. Review on Heat Treatment of wood, Cost Action E 22, Proceeding of Special Seminar Held in Antibes, February 2004, France, pp. 47-62. Rep, G., Pohleven, F., and Bucar, B. (2004) Characteristics of Thermally modified Wood in Vacuum. IRG / WP02- 40223, IRG Annual Meeting 6-10 June, SLOVENIA. Sanaee, A., and Mohebby, B. (2004) The effects of heat treatment on physical proposition of beech wood, M. S. Thesis, Tarbiat Modarres University. Santos, J.A. (2000) Mechanical behavior of Eucalyptus wood modified by heat, Wood Science and Technology. 34, 39-43. Sivonen, H., Maunu, S,L., Sundholm, F., Jämsä, S. and Viitaniemi, P. (2002) Magnetic Resonance Studies of Thermally Modified Wood. Holzforschung 56, 648-654. Syrjänen, T. and Oy, K. (2001) Production and classification of heat Treated Wood in Finland. Review on Heat Treatment of wood, Cost Action E 22, Proceeding of Special Seminar Held in Antibes, February 2001, France, 7-15. Tjeerdsma, B., Boonstra, M., Pizzi, A., Tekely, P. and Militz, H. (1998) Characterization of thermally modified wood: molecular reasons for wood performance improvement. Holz als Roh- und Werkstoff 56,149- 153. Vernois, M. (2000) Heat treatment of wood in France – state of the art. In: Proceedings of the seminar on production of heat treated wood in Europe 20 11 2000 in Helsinki. Tekes Lahontorjuntayhdistys ry Kestopuu Oy, p: 6. Westin, M., Rappa A.O. and Nilsson, T. (2004) Durability of pine modified by 9 different methods, IRG / WP 04- 40288, IRG Annual Meeting 6-10 June, SLOVENIA. Welzbacher, C. and Rapp, A.O. (2004) Determination of the water sorption properties and preliminary results from field tests above ground of thermally modified martial form industrial scale processes. IRG / WP 04- 40288, IRG Annual Meeting 6-10 June, SLOVENIA. Yildiz, U., Gercek, Z., Yildize, S., Gezer, E., Serdar, B., Yildiz, S., Gezer, E.D., Dizman, E. and Temiz, A. (2003) The effects of heat treatment on the specific gravity of beech and spruce wood; IRG / WP 03- 40254, IRG Annual Meeting 18-23 May, Australia. Yildiz, U., Gercek, Z., Gezer, E., Serdar, B., Yildiz, S., Gezer, E.D., Dizman, E. and Temiz, A.(2004a) The effects of Heat Treatment on Anatomical changes of beech wood; IRG / WP02- 40223, IRG Annual Meeting 6-10 June, SLOVENIA. Yildiz, S., Yildiz, Ü., Gezer, E., Temiz, A. and Dízman, E. (2004b) The effects of Heat Treatment on Toughness of beech wood, IRG/WP 04-40283, IRG Annual Meeting 6- 10 June, SLOVENIA. | ||
| کلیدواژهها | ||
| Hydrothermal treatment؛ Dimensional stability؛ water absorption؛ Specific gravity؛ Beech wood | ||
|
آمار تعداد مشاهده مقاله: 2,228 تعداد دریافت فایل اصل مقاله: 1,791 |
||