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Moisture-induced distortion of laminated veneer products
Linnaeus University, Faculty of Technology, Department of Forestry and Wood Technology. (Skog och träteknik)ORCID iD: 0000-0001-8644-4099
Linnaeus University, Faculty of Technology, Department of Forestry and Wood Technology.
Linnaeus University, Faculty of Technology, Department of Forestry and Wood Technology.
2013 (English)In: Proceedings of the 9th meeting of the Northern European network for wood science and engineering (WSE): September 11-12, 2013, Hannover, Germany / [ed] Christian Brischke & Linda Meyer, Hannover, Germany, 2013, 178-183 p.Conference paper (Refereed)
Abstract [en]

Laminated veneer products consist of veneers bonded together with adhesive into a predetermined shape. Since wood is a hygroscopic material and also anisotropic by nature, laminated veneer products are especially shape-sensitive to changes in moisture content. A deviation from the intended shape is a problem for both the manufacturers and users of the final products and annually such deviations cause great economic losses in the manufacturing industry.


To illustrate the influence of moisture on distortion and shape stability, studies have been performed in industrial conditions and in a laboratory environment. Veneers of beech and birch and a seat shell moulded from these veneers were used in the study. Distortion, i.e. spring-back, position and twist, has been determined directly after moulding and during subsequent moisture and drying cycles.


The distortion follows more or less slavishly the changes in relative humidity around the product. The distortion is generally small directly after moulding but, after the laminates have been exposed to a variation in relative humidity, the distortion increases. Some of the problems of poor shape stability that may arise later in the bending process can be reduced if attention is paid to moisture content and fibre orientation already in the production of the veneer.


To achieve good shape stability of laminated veneer products in practice, the following should be followed by the manufacture industry:

  • develop      cooperation with suppliers of veneer and set requirements of veneer with regard      to deviation of the fibre orientation, and require that the veneer be dried      and conditioned to a moisture content consistent with production,
  • control      incoming veneers with respect to fibre orientation and moisture content,
  • plan warehousing      of veneers and ensure adequate conditioning, and
  • consider      the orientation of the veneers and the species.
Place, publisher, year, edition, pages
Hannover, Germany, 2013. 178-183 p.
Keyword [en]
thermo-hydro-mechanical processing, shape stability, wood
National Category
Wood Science
Research subject
Technology (byts ev till Engineering), Forestry and Wood Technology
URN: urn:nbn:se:lnu:diva-28989OAI: diva2:650573
Northern European network for wood science and engineering (WSE), Sept. 11-12, 2013, Hannover, Germany
Available from: 2013-09-23 Created: 2013-09-23 Last updated: 2016-04-27Bibliographically approved

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