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European Journal of Wood and Wood Products

, Volume 70, Issue 4, pp 497–506 | Cite as

Investigation on bonding quality of beech wood (Fagus orientalis L.) veneer during high temperature drying and aging

  • Loya Jamalirad
  • Kazem Doosthoseini
  • Gerald Koch
  • Seyed Ahmad Mirshokraie
  • Johannes Welling
Originals Originalarbeiten

Abstract

In the present study, the effects of high drying temperature and UV light induced aging on bonding quality of plywood manufactured from untreated and treated veneer layers were investigated. Rotary cut veneers with dimensions of 500 mm×500 mm×2 mm produced from beech (Fagus orientalis Lipsky) log were selected for topochemical, chemical and mechanical analyses. The veneer sheets were oven-dried at 100°C and 180°C after the peeling process. Afterwards, the surfaces were exposed to artificial UV irradiation in an UV chamber for 24 h, 48 h and 72 h representing natural sun irradiation of 2, 4 and 6 months, respectively. Topochemical distribution of lignin and phenolic extractives of the treated and untreated veneers was investigated on a cellular level using UV microspectrophotometry (UMSP). For the chemical characterization of accessory compounds high performance liquid chromatography (HPLC) was used. Furthermore, the shear and bending strengths of plywood manufactured from the treated samples are determined in order to study the bonding quality. The UV microscopic detection shows that after high drying temperature and aging treatment, lignin condensation occurs. With increasing drying temperature and aging duration, more phenolic extractives are situated in parenchyma cells and vessel lumens which can be proved by increased absorbance at 278 nm. The HPLC analysis of the treated tissue showed distinct signals of polymerized compounds such as catechin and 2,6-dimethoxybenzoquinone which are chromophoric compounds in discolored beech wood. The mechanical properties of plywood showed that with increasing drying temperature up to 180°C does not negatively affect shear and bending strengths of samples. After exposure of the veneers to UV irradiation (especially 6 months), decreasing shear and bending strengths of plywood samples can be observed.

Keywords

Lignin High Performance Liquid Chromatography Catechin Wood Surface Bonding Quality 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Untersuchung des Einflusses von Hoch-Temperaturtrocknung und Alterung auf die Verklebungseigenschaften von Buchen-Furniersperrholz (Fagus orientalis)

Zusammenfassung

In der vorliegenden Arbeit wurden die Verklebungseigenschaften von Sperrhölzern untersucht, die aus thermisch behandelten und UV-belichteten Schälfurnieren hergestellt wurden. Für die Untersuchungen wurden Schälfurniere der Holzart Buche (Fagus orientalis, Format 500×500×2 mm3) mit Temperaturen von 100°C und 180°C thermisch behandelt und die Oberflächen anschließend 24, 48 bzw. 72 Stunden künstlich belichtet, was einer natürlichen Sonneneinstrahlung von 2, 4 bzw. 6 Monaten entspricht. Das Holzgewebe der thermisch behandelten und UV-belichteten Furniere wurde im Vergleich zu unbehandelten Schälfurnieren topochemisch mit Hilfe der zellulären Universalmikrospektralphotometrie (UMSP) analysiert, um Reaktionen des Lignins und phenolischer Extraktstoffe zu detektieren. Für die chemischen Analysen der Extraktstoffe wurden zusätzlich chromatographische Untersuchungen (HPLC-Chromatographie) durchgeführt. Zur Charakterisierung der Verklebungseigenschaften wurden Sperrhölzer aus den unterschiedlich behandelten Furnieren hergestellt und deren Scher- und Biegefestigkeiten bestimmt. Die topochemischen Untersuchungen haben gezeigt, dass mit zunehmender Behandlungstemperatur und UV-Belichtung höherkondensierte Ligninpolymere und phenolische Extraktstoffe entstehen, die durch eine Zunahme der Absorptionswerte bei einer Wellenlänge von 278 nm charakterisiert werden. In den Extrakten der behandelten Furniere wurden v.a. polyphenolische Verbindungen wie Catechin und 2,6-Dimethoxybenzochinon isoliert, die für die Farbänderungen des Holzes verantwortlich sind. Die mechanischen Untersuchungen haben gezeigt, dass die Scher- und Biegefestigkeiten infolge der Temperaturbehandlung der Furniere nicht wesentlich beeinflusst werden, wogegen die UV-Belichtung (entsprechend 6 Monaten Sonneneinstrahlung) zu einer Abnahme der Festigkeitseigenschaften geführt hat.

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Loya Jamalirad
    • 1
  • Kazem Doosthoseini
    • 1
  • Gerald Koch
    • 2
  • Seyed Ahmad Mirshokraie
    • 3
  • Johannes Welling
    • 2
  1. 1.Department of Wood and Paper Science and Technology, Faculty of Natural ResourcesUniversity of TehranTehranIran
  2. 2.Institute for Wood Technology and Wood Biology, Federal Research Institute of Rural AreasForestry and Fisheries (vTI)HamburgGermany
  3. 3.Department of ChemistryPayame Noor UniversityTehranIran

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