onr:"swepub:oai:DiVA.org:lnu-41840"
Search: onr:"swepub:oai:DiVA.org:lnu-41840" > Factors Influencing...
- 1 of 1
- Previous record
- Next record
- To hitlist
Factors Influencing the Crack Formation in Thermally Modified Wood
-
- Altgen, Michel (author)
- Georg-August-University, Germany
-
- Adamopoulos, Stergios (author)
- Georg-August-University, Germany
-
- Ala-Viikari, Jukka (author)
- International ThermoWood Association, Finland
- show more...
- show less...
- (creator_code:org_t)
- University of Ljubljana, 2012
- 2012
- English.
- In: The Sixth European Conference on Wood Modification. - : University of Ljubljana. - 9789616144353 ; , s. 149-158
- Conference paper (peer-reviewed)
Abstract
Subject headings
Close
- Wood anatomical changes during a thermal modification process are likely to adverselyaffect the properties of the final product. Therefore, an anatomical investigation was performed on Scots pine and Norway spruce material coming from different steps of the regular production of ThermoWood. A macroscopic evaluation using an evaluation scale between 1 and 3 revealed typical drying defects in some of the kiln dried boards. Nevertheless, at least 50 % of the unmodified boards were defect free (CR = 1), while at least 90 % of the thermally modified boards were not defect free (CR = 2 and CR = 3), thus indicating that surface cracks become more frequent and severe after the modification process. However there was no evidence of an impact of the conditioning stage on the crack formation. Even though most of the surface cracks were removed by planing, microscopic analysis by means of light and scanning electron microscopy revealed that there might still be micro-defects within the ThermoWood. Such micro-defects were mainly associated with parenchyma or epithelial cells of the rays or the resin canals. Furthermore, longitudinal cracks within the tracheids were observed within the earlywood latewood interface or within the earlywood. During repeated drying and wetting cycles, the crack formation was higher for thermally modified wood than for unmodified, despite a lower water uptake and a better dimensional stability. After the third cycle, the average crack rating of thermally modified wood was at least twice as high as for the unmodified wood. It was concluded that this increase in the crack formation might be caused by the presence of micro-defects that potentially act as a starting point for more severe cracks during swelling and shrinkage.
Subject headings
- LANTBRUKSVETENSKAPER -- Lantbruksvetenskap, skogsbruk och fiske -- Trävetenskap (hsv//swe)
- AGRICULTURAL SCIENCES -- Agriculture, Forestry and Fisheries -- Wood Science (hsv//eng)
Keyword
- cracks
- drying-wetting cycles
- microscopy
- ThermoWood
- wood anatomical changes
- Forestry and Wood Technology
- Skog och träteknik
Publication and Content Type
- ref (subject category)
- kon (subject category)
Find in a library
- The Sixth European Conference on Wood Modification (Search for host publication in LIBRIS)
To the university's database
- 1 of 1
- Previous record
- Next record
- To hitlist
Find more in SwePub
- By the author/editor
- Altgen, Michel
- Adamopoulos, Ste ...
- Ala-Viikari, Juk ...
- Hukka, Antti
- Tetri, Timo
- Militz, Holger
- About the subject
-
- AGRICULTURAL SCIENCES
- AGRICULTURAL SCI ...
- and Agriculture Fore ...
- and Wood Science
- Articles in the publication
- The Sixth Europe ...
- By the university
- Linnaeus University
Search outside SwePub
- Extend your search to:
- Google Book Search
- Google Scholar
Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.
- Copyright © LIBRIS - National Library Systems
- LIBRIS.kb.se
