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Effect of conditioning history on the characterization of hardness of thermo-mechanical densified and heat treated poplar wood
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2017 (English)In: Holzforschung, ISSN 0018-3830, E-ISSN 1437-434X, Vol. 71, no 6, 515-520 p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
Walter de Gruyter, 2017. Vol. 71, no 6, 515-520 p.
Keyword [en]
conditioning history, hardness, heat treatment, poplar wood, set-recovery, thermo-mechanical densification, two-step conditioning
National Category
Wood Science
Identifiers
URN: urn:nbn:se:kth:diva-209879DOI: 10.1515/hf-2016-0178ISI: 000401835900008Scopus ID: 2-s2.0-85020417879OAI: oai:DiVA.org:kth-209879DiVA: diva2:1115585
Funder
Swedish Research Council Formas, 2014-172
Note

QC 20170627

Available from: 2017-06-27 Created: 2017-06-27 Last updated: 2017-06-27Bibliographically approved

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CiteExportLink to record
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Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
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  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
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  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
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