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The Influence of Mechanical Surface Preparation Method, Adhesive Type, and Curing Temperature on the Bonding of Darwin Stringybark

Leggate, W., McGavin, R. L., Outhwaite, A., Dorries, J., Robinson, R., Kumar, C., Faircloth, A. and Knackstedt, M. (2021) The Influence of Mechanical Surface Preparation Method, Adhesive Type, and Curing Temperature on the Bonding of Darwin Stringybark. BioResources, 16 (1). p. 22. ISSN 1930-2126

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Article Link(s): https://ojs.cnr.ncsu.edu/index.php/BioRes/article/...

Abstract

Darwin stringybark (Eucalyptus tetrodonta) is one of Northern Australia’s most important commercial forest resources. The wood exhibits desirable wood properties including high strength, natural durability, and visual appeal. The production of engineered wood products (EWPs) such as glulam from this resource represents a significant commercial opportunity for the timber industry in northern Australia. However, a major challenge to overcome is the achievement of satisfactory glue bond performance. This study evaluated the effects of different surface machining preparations, adhesive types, and curing temperatures on the bonding characteristics of Darwin stringybark. The pre-gluing surface machining method significantly influenced the timber wettability, roughness, permeability and tensile shear strength of adhesive bonds. Planing resulted in the lowest wettability, roughness, and permeability, while bonded planed samples produced the poorest tensile shear strength. Alternative surface machining methods including face milling and sanding post-planing were shown to significantly improve the timber wettability, roughness, and permeability, and also to increase the tensile shear strength of bonded samples. The resorcinol formaldehyde adhesive resulted in slightly improved tensile shear strength in most cases compared to the polyurethane adhesive. There was no significant improvement in tensile shear strength with the use of elevated temperature curing.

Item Type:Article
Business groups:Horticulture and Forestry Science
Keywords:Wood surface machining Wood wettability Wood permeability Wood adhesion Wood roughness Eucalyptus tetrodonta Darwin stringybark
Subjects:Forestry > Research. Experimentation
Forestry > Forestry machinery and engineering
Forestry > Tools and implements
Forestry > Exploitation and utilization
Deposited On:29 Mar 2021 03:20
Last Modified:27 May 2021 10:07

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