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Wood Research and Technology

Holzforschung

Cellulose – Hemicelluloses – Lignin – Wood Extractives

Editor-in-Chief: Faix, Oskar / Salmén, Lennart

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Volume 68, Issue 8

Issues

The influence of felling season and log-soaking temperature on the wetting and phenol formaldehyde adhesive bonding characteristics of birch veneer

Anti Rohumaa
  • Corresponding author
  • Department of Forest Products Technology, School of Chemical Technology, Aalto University, Tekniikantie 3, 02150 Espoo, Finland
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/ Christopher G. Hunt
  • US Forest Service, Forest Products Laboratory, One Gifford Pinchot Drive, Madison, WI 53726, USA
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/ Charles R. Frihart
  • US Forest Service, Forest Products Laboratory, One Gifford Pinchot Drive, Madison, WI 53726, USA
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/ Pekka Saranpää / Martin Ohlmeyer / Mark Hughes
  • Department of Forest Products Technology, School of Chemical Technology, Aalto University, Tekniikantie 3, 02150 Espoo, Finland
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Published Online: 2014-04-02 | DOI: https://doi.org/10.1515/hf-2013-0166

Abstract

Most adhesive studies employing wood veneer as the substrate assume that it is a relatively uniform material if wood species and veneer thickness are constant. In the present study, veneers from rotary cut birch (Betula pendula Roth) were produced from logs harvested in spring, autumn and winter, and soaked at 20°C and 70°C prior to peeling. Firstly, veneers produced from logs felled in autumn were dried at 103°C for 24 h and subsequently half of these veneers were heat-treated at 180°C for 3 h. In addition, veneers produced from logs felled in all three seasons were dried at 160°C for 3.5 min to simulate industrial drying. The wettability of veneers was evaluated goniometrically, and bonding strength was evaluated with an automated bonding evaluation system (ABES). The results show that soaking birch logs at 70°C rather than at 20°C before peeling, or harvesting trees in the spring rather than in the autumn or winter, gives rise to veneers with enhanced wettability and higher bond strengths with a phenol-formaldehyde adhesive. Changes in the preparation and history of a veneer surface may have a profound effect on the development of adhesive bonds.

Keywords: automated bonding evaluation system (ABES); bond strength; felling season; heat-treatment; soaking temperature; veneer; wettability

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About the article

Corresponding author: Anti Rohumaa, Wood Material Technology, Department of Forest Products Technology, Aalto University School of Chemical Technology, P.O. Box 16400, 00076 Aalto, Finland, e-mail:


Received: 2013-08-30

Accepted: 2014-03-06

Published Online: 2014-04-02

Published in Print: 2014-12-01


Citation Information: Holzforschung, Volume 68, Issue 8, Pages 965–970, ISSN (Online) 1437-434X, ISSN (Print) 0018-3830, DOI: https://doi.org/10.1515/hf-2013-0166.

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