Change search
ReferencesLink to record
Permanent link

Direct link
Thermo-hydro and thermo-hydro-mechanical wood processing: an opportunity for future environmentally friendly wood products
Linnaeus University, Faculty of Technology, Department of Forestry and Wood Technology. (Virkeslära)
Institute of Steel and Timber Construction, Technische Universität Dresden, Germany.
Wood and Civil Engineering, Bern University of Applied Science, Biel, Switzerland.
2013 (English)In: Wood Material Science & Engineering, ISSN 1748-0272, Vol. 8, no 1, 64-88 p.Article, review/survey (Refereed) Published
Abstract [en]

This state-of-the art report presents the basic concepts of some of the thermo-hydro (TH) and thermo-hydro-mechanical (THM) wood processes that are in use today, i.e. heat treatment, compression of wood in the longitudinal or transverse direction, and wood welding. The reasons for the growing interest in TH and THM techniques are discussed and the development of the different concepts, from first ideas to current status, is briefly presented. The physical and chemical changes that occur in wood during TH and THM processing according to the latest research are also presented. Finally, developments that are close to or already have an industrial application are presented and the challenges for further development of the heat treatment, compression and wood welding processes are discussed.

The TH processing of wood is based entirely on water and heat, and a THM process incorporates an additional mechanical force. The purpose of wood transformation by a TH or a THM process is to improve the intrinsic wood properties, to acquire a form and functionality desired by engineers without changing its eco-friendly characteristics or hindering its further use in the total material life cycle.

Only a few of the recently developed techniques, e.g. wood welding and various densification applications, have been industrialized to any great extent. There are many reasons for this relatively low transfer of the research results to a full up-scaled industrial production. Some of them are related to unsolved problems at the laboratory level on small-size samples and others are related to the scaling-up processes in industry. Furthermore, the aging of heated wood leads to deterioration with time, in some cases there is an unpleasant odour, the strength of the wood decreases substantially and the wood becomes more brittle. These are new challenges which need to be resolved by the collaboration of researchers from the different scientific domains of academia, research institutes and industry.

Place, publisher, year, edition, pages
Taylor & Francis Group, 2013. Vol. 8, no 1, 64-88 p.
Keyword [en]
Heat treatment, accelerated ageing, densification, wood welding, wood bending, value added, wood quality
National Category
Wood Science
Research subject
Technology (byts ev till Engineering), Forestry and Wood Technology
URN: urn:nbn:se:lnu:diva-19140DOI: 10.1080/17480272.2012.751935OAI: diva2:529700
Available from: 2012-05-31 Created: 2012-05-31 Last updated: 2013-07-25Bibliographically approved

Open Access in DiVA

fulltext(1059 kB)462 downloads
File information
File name FULLTEXT01.pdfFile size 1059 kBChecksum SHA-512
Type fulltextMimetype application/pdf

Other links

Publisher's full text

Search in DiVA

By author/editor
Sandberg, Dick
By organisation
Department of Forestry and Wood Technology
In the same journal
Wood Material Science & Engineering
Wood Science

Search outside of DiVA

GoogleGoogle Scholar
Total: 462 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 83 hits
ReferencesLink to record
Permanent link

Direct link