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Bonding surface-modified Karri and Jarrah with resorcinol formaldehyde

I. The effect of sanding on wettability and shear strength

Verleimung von oberflächenbehandeltem Eukalyptusholz mit Resorcin-Formaldehyd

I. Einfluß des Schleifens auf Benetzbarkeit und Scherfestigkeit

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Abstract

A series of abrasive papers were used to sand machined regrowth karri (Eucalyptus diversicolor) and regrowth jarrah (E. marginata) wood surfaces. Shear test specimens were then prepared by gluing sanded wood blocks with resorcinol-formaldehyde and pressing them at 1500 kPa and 20°C for 7 hours. Wettability measurements on sanded wood surfaces and strength tests on shear test specimens were used to assess the ability of the sanding treatment to improve adhesive performance. The effect of sanding on wettability and shear strength varied according to the abrasiveness of the sanding treatment. Application of the coarsest abrasive (80 grit) significantly improved wettability and shear (adhesive) strength in both dry and wet conditions. A positive correlation between wettability and shear strength occurred only after sanding. SEM observations revealed different morphological structures of the glueline in sanded and non-sanded surfaces.

Zusammenfassung

Holzproben von Karri (Eucalyptus diversicolor) und Jarrah (E. marginata) wurden mit Schleifpapier unterschiedlicher Korngröße geschliffen und danach mit Resorein-Formaldehyd verleimt (1500 kPa; 20°C; 7 h). Die Benetzbarkeit der verschiedenen Oberflächen und die Scherfestigkeit der verleimten Proben wurden bestimmt, um Anhaltspunkte für die Verbesserung der Verleimung geschliffener Oberflächen zu erhalten. Schleifen mit dem gröbsten Korn (80) verbesserte Benetzbarkeit und Scherfestigkeit (Verleimung) signifikant, sowohl unter trockenen als auch unter feuchten Bedingungen. Eine positive Korrelation zwischen Benetzbarkeit und Scherfestigkeit war nur an geschliffenen Oberflächen feststellbar. REM-Beobachtungen ließen unterschiedliche Strukturen an der Leimgrenze bei geschliffenen und ungeschliffenen Oberflächen erkennen.

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Authors and Affiliations

  1. Department of Forestry, Australian National University, GPO-Box 4, 2601, Canberra, ACT, Australia

    J. Belfas, K. W. Groves & P. D. Evans

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  1. J. Belfas
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  2. K. W. Groves
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  3. P. D. Evans
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Belfas, J., Groves, K.W. & Evans, P.D. Bonding surface-modified Karri and Jarrah with resorcinol formaldehyde. Holz als Roh-und Werkstoff 51, 253–259 (1993). https://doi.org/10.1007/BF02629370

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