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CT-scanning during heat treatment of wood
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.ORCID iD: 0000-0002-5869-2236
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
2011 (English)In: Pro Ligno, ISSN 1841-4737, E-ISSN 2069-7430, Vol. 7, no 4, p. 11-17Article in journal (Refereed) Published
Abstract [en]

Earlier experiences from industrial heat treatment of wood with the ThermoWood® process show that more or less extensive internal cracking may occur for thicker dimensions. This type of timber damage is particularly troublesome because these cracks do not reach the surface and are thus not visible on unprocessed timber. After resawing or planing the boards, cracks can appear, resulting in costly downgrading of the material. The ThermoWood® heat treatment process can be divided into six periods. The first period, the heating period, is when saturated steam is injected into the kiln, the second period is the drying step, which can be either high or low temperature drying, the third period is when the final heating and drying take place, the fourth period is when the temperature is kept constant for about 2–4 hours, the fifth period is the cooling regime, the sixth period is the conditioning regime for remoistening the material, and the last period is the cooling one. At the Division of Wood Physics at Luleå University of Technology in Skellefteå a climate chamber has recently been installed. This climate chamber together with a CTscanner makes it possible to study wood density changes in different climates. As the maximum temperature that can be reached in the climate chamber is 220 °C, it is also possible to study the heat treatment process, besides conventional air circulation drying. The aim of this study was to use the CT-scanning (CT) technique during heat treatment of wood in order to investigate whether it is possible to detect internal checking in situ during the treatment.

Place, publisher, year, edition, pages
2011. Vol. 7, no 4, p. 11-17
National Category
Bio Materials
Research subject
Wood Physics
Identifiers
URN: urn:nbn:se:ltu:diva-5502Local ID: 39e7dc28-5af0-4da3-ba3e-1c1c8573514fOAI: oai:DiVA.org:ltu-5502DiVA, id: diva2:978376
Note
Godkänd; 2011; 20121005 (larsh)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved

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http://www.proligno.ro/ro/articles/2011/4/hansson_full.pdf

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Hansson, LarsMorén, Tom

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