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Wood Research and Technology

Holzforschung

Cellulose – Hemicelluloses – Lignin – Wood Extractives

Editor-in-Chief: Faix, Oskar

Editorial Board: Daniel, Geoffrey / Militz, Holger / Rosenau, Thomas / Salmen, Lennart / Sixta, Herbert / Vuorinen, Tapani / Argyropoulos, Dimitris S. / Balakshin, Yu / Barnett, J. R. / Burgert, Ingo / Rio, Jose C. / Evans, Robert / Evtuguin, Dmitry V. / Frazier, Charles E. / Fukushima, Kazuhiko / Gindl-Altmutter, Wolfgang / Glasser, W. G. / Holmbom, Bjarne / Isogai, Akira / Kadla, John F. / Koch, Gerald / Lachenal, Dominique / Laine, Christiane / Mansfield, Shawn D. / Morrell, J.J. / Niemz, Peter / Potthast, Antje / Ragauskas, Arthur J. / Ralph, John / Rice, Robert W. / Salin, Jarl-Gunnar / Schmitt, Uwe / Schultz, Tor P. / Sipilä, Jussi / Takano, Toshiyuki / Tamminen, Tarja / Theliander, Hans / Welling, Johannes / Willför, Stefan / Yoshihara, Hiroshi

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1437-434X
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Volume 71, Issue 6

Issues

Effect of conditioning history on the characterization of hardness of thermo-mechanical densified and heat treated poplar wood

Tao Li
  • Corresponding author
  • College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China
  • Department of Wood Science, University of British Columbia, Vancouver V6T 1Z4, Canada
  • Email
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Jia-bin Cai
  • College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Stavros Avramidis / Da-li Cheng
  • College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China
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  • De Gruyter OnlineGoogle Scholar
/ Magnus E.P. Wålinder
  • Division of Building Materials, Department of Civil and Architectural Engineering, KTH Royal Institute of Technology, SE-10044 Stockholm, Sweden
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  • De Gruyter OnlineGoogle Scholar
/ Ding-guo Zhou
  • College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China
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Published Online: 2017-04-07 | DOI: https://doi.org/10.1515/hf-2016-0178

Abstract

Poplar wood was modified by a combination of thermo-mechanical densification (TMD) and heat treatment (HT) process at five temperatures ranging from 170 to 210°C. A new two-step conditioning method (CM) is suggested, in the course of which the modified wood is submitted to 50°C/99% RH→25°C/65% RH, where RH means relative humidity in the climate chamber. The traditional one-step CM (25°C/65% RH) served as reference. The effects of conditioning history on hardness were observed and analyzed along with the change of dimensional stability. The hardness of the modified wood was lower in the case of the proposed CM due to more set-recovery release, but the extent of that decreased with the HT temperature. For a good hardness, HT200°C should be selected with the proposed CM, which is different from the optimization output of 180°C obtained from the traditional CM. In conclusion, a specific assessment method for the performance characterization of this type of modified wood would be beneficial for the combined TMD and HT processes.

Keywords: conditioning history; hardness; heat treatment; poplar wood; set-recovery; thermo-mechanical densification; two-step conditioning

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About the article

Received: 2016-10-13

Accepted: 2017-03-06

Published Online: 2017-04-07

Published in Print: 2017-06-27


Citation Information: Holzforschung, Volume 71, Issue 6, Pages 515–520, ISSN (Online) 1437-434X, ISSN (Print) 0018-3830, DOI: https://doi.org/10.1515/hf-2016-0178.

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