Change search
ReferencesLink to record
Permanent link

Direct link
A New Method for Bending Solid Wood: High Frequency Heating of Beech
Linnaeus University, Faculty of Science and Engineering, School of Engineering. (Virkeslära)
Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design. (Virkeslära)
2005 (English)In: Hardwood research and utilisation in Europe / [ed] Bejo, L., Sopron: University of West Hungary , 2005, 156-161 p.Conference paper (Refereed)
Abstract [en]

In their natural state, most hardwoods cannot be bent to an appreciably small radius of curvature. This is due to either fracturing or retaining elastic properties sufficient to cause spring back to approximately their original shape on removal of the bending force. But some species when subjected to heat in the presence of moisture (usually by steaming or boiling) become semi-plastic and their compressibility is very increased.

By holding the bended material to shape after bending, and subsequently drying and cooling it, the wood tends to become rigid and “set” almost exactly to the curved shape imposed on it by bending. The rate of production when using traditional methods for solid wood bending is considerably slow and there is request from the industry to reducing the processing time and thereby reducing the production costs.

A new method for solid wood bending is presented in this paper. The method is based on high frequency technique for heating, plasticizing and drying the wood to be bent in one step. One of the purposes to use high frequency heating was to decrease the time of the bending process. In practise this means reducing the time to bend and dry a straight piece of solid wood from a moisture content of about 25 % to 6 – 8 % from about 24 hours to about 10 minutes. This gives high demands on controlling the moisture content, temperature and the strain fields that occur in the wood during bending.

Place, publisher, year, edition, pages
Sopron: University of West Hungary , 2005. 156-161 p.
Keyword [en]
wood bending, beech, birch, thermo hydro mecahnical processing, high frequency, softening, production
National Category
Wood Science
Research subject
Technology (byts ev till Engineering), Forestry and Wood Technology
URN: urn:nbn:se:lnu:diva-20949OAI: diva2:542402
The 2nd European Conference on Hardwood. September 6, Sopron, Hungary
Available from: 2012-08-28 Created: 2012-07-31 Last updated: 2012-08-28Bibliographically approved

Open Access in DiVA

fulltext(285 kB)415 downloads
File information
File name FULLTEXT01.pdfFile size 285 kBChecksum SHA-512
Type fulltextMimetype application/pdf

Search in DiVA

By author/editor
Sandberg, DickJohansson, Jimmy
By organisation
School of EngineeringSchool of Technology and Design
Wood Science

Search outside of DiVA

GoogleGoogle Scholar
Total: 415 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

Total: 40 hits
ReferencesLink to record
Permanent link

Direct link