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Microwave treatment of resinous wood
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
2006 (English)In: Wood structure and properties '06: [proceedings of the 5th IUFRO Symposium Wood Structure and Properties '06 held on September 3-6, 2006 in Sliač - Sielnica, Slovakia] / [ed] R. Lagana; S. Kurjatko; J. Kudela, Zvolen, Slovakia: Arbora Publishers , 2006, 435-437 p.Conference paper (Refereed)
Abstract [en]

The output from conventional air-circulation drying of wood is not always satisfying; some individual wood boards often contain somewhat higher moisture content (MC) than the target MC. Higher MC in some pine wood boards after conventional drying could origin from the fact that these contain higher amounts of resin, which may delay or to some extent prevent the moisture flux. It could be the reason to problems in further wood production processes, as for example in gluing processes. The aim of this study was to determine whether or not microwave (MW) heating could be a suitable method to condition these components. Another aim was to investigate if and how migration of resin appears during MW treatment. The study includes experimental tests where determination of both MC and resin content (RC) were carried out before and after MW treatment. Results from the tests show that the RC and the MC are interacting; it means that volumes with high RC also withhold increased amount of moisture; these volumes are often found within boards that origin from the root end of logs. It is possible to dry/condition these planks to reach the target MC within minutes or hours, depending on wood thickness, using MW power. By exposing resinous wood to microwaves, migration of resin takes place from the interior towards the wood surfaces, especially longitudinally through the wood towards the butt ends. It seems to be possible to redistribute RC and MC in wood by exposing only parts of a plank to microwaves.

Place, publisher, year, edition, pages
Zvolen, Slovakia: Arbora Publishers , 2006. 435-437 p.
Research subject
Wood Physics
Identifiers
URN: urn:nbn:se:ltu:diva-38660Local ID: d1c6d8a0-079a-11dc-b09b-000ea68e967bISBN: 80-968869-4-3OAI: oai:DiVA.org:ltu-38660DiVA: diva2:1012161
Conference
International Symposium Wood Structure and Properties : 03/09/2006 - 06/09/2006
Note
Godkänd; 2006; 20070521 (cira)Available from: 2016-10-03 Created: 2016-10-03Bibliographically approved

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