Feasibility of wood peeling assisted by infrared heating

Thumbnail Image
Journal Title
Journal ISSN
Volume Title
School of Chemical Technology | Doctoral thesis (article-based) | Defence date: 2013-12-13
Checking the digitized thesis and permission for publishing
Instructions for the author
Degree programme
87 app. 71
Aalto University publication series DOCTORAL DISSERTATIONS, 200/2013
"Peeling" is the process of converting a log into a continuous thin (from 0.6 to more than 3 mm) ribbon of green wood termed "veneer" whose production plays an important role in the manufacture of light-weight packaging, plywood and Laminated Veneer Lumber (LVL) which are amongst the most widely used wood products. Prior to peeling, the round green-wood of most species needs to be heated to temperatures ranging from 30 to 90 degrees Celcius in order to soften the wood and ease cutting. Forming part of a broader program to develop a system that could be embedded on a peeling lathe, the foal of this PhD thesis was to investigate the technological feasibility of using infrared (IR) to heat green logs and so circumvent many of the economic and environmental disadvantages arising from soaking. The main output of this study was to demonstrate that the penetration depth of IR into green woods is limited to several tens of micrometers and that heat transfers into green wood up to the cutting plane (locating several millimeters underneath the surface) is by conduction, which is slow due to the insulating properties of wood. Heating green wood with IR radiation is therefore unsuitable for the high peeling rates currently in use in the industry.
Supervising professor
Batsale, Jean-Christophe, Prof., Arts et Metiers ParisTech, France
Hughes, Mark, Prof., Aalto University, Department of Forest Products Technology, Finland
Thesis advisor
Denaud, Louis-Etienne, Arts et Metiers ParisTech, France
Kusiak, Andrzej, University of Bordeaux, France
Marchal, Rémy, CIRAD, France
Rossi, Fréderic, Arts et Metiers ParisTech, France
beech, birch, Douglas-fir, green wood, heating, infrared, peeling, spruce
Other note
  • [Publication 1]: Dupleix A., Denaud L., Bléron L., Marchal R., Hughes M. (2013) The effect of log heating temperature on the peeling process and veneer quality: beech, birch and spruce case studies. Eur J Wood Prod 71(2), 163-171, DOI 10.1007/s00107-012-0656-1.
  • [Publication 2]: Dupleix A., De Sousa Meneses D., Hughes M., Marchal R. (2012) Mid infrared absorption properties of green wood. Wood Sci Technol 47(6), 1231-1241, DOI 10.1007/s00226-013-0572-5.
  • [Publication 3]: Dupleix A., Kusiak A., Hughes M., Rossi F. (2012) Measuring the thermal properties of green wood by the transient plane source (TPS) technique. Holzforschung 67(4), 437-445, DOI 10.1515/hf-2012-0125.
  • [Publication 4]: Dupleix A., Ould Ahmedou S.-A., Bléron L., Rossi F., Hughes M. (2012) Rational production of veneer by IR-heating of green wood during peeling: Modeling experiments. Holzforschung 67(1), 53-58, DOI 10.1515/hf-2012-0005.
  • [Publication 5]: Dupleix A., Batsale J.C., Kusiak A., Hughes M., Denaud L. (2013) Experimental validation of green wood peeling assisted by IR heating – some analytical considerations for system design. Submitted.