Influence of pressure on bond-line shear strength in laminated veneer products

In this study, the bond-line strength of different bonding pressure of veneers in dry (9% moisture content) and wet (immersed in water) conditions was investigated. The results show that peeled European beech veneers need approximately 0.5- 1.2 MPa pressure to achieve a proper bond-line when a urea-...

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Bibliographic Details
Published in:Wood material science and engineering 2022-11, Vol.17 (6), p.1020-1021
Main Authors: Blomqvist, Lars, Sterley, Magdalena
Format: Article
Language:English
Subjects:
Adhesion
Adhesive strength
Adhesives
Beech
Bonding strength
Compression
High pressure
LVP
Moisture content
Moisture effects
Pressure
Shear strength
Urea
urea formaldehyde adhesive
Veneers
Water content
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Summary:In this study, the bond-line strength of different bonding pressure of veneers in dry (9% moisture content) and wet (immersed in water) conditions was investigated. The results show that peeled European beech veneers need approximately 0.5- 1.2 MPa pressure to achieve a proper bond-line when a urea-formaldehyde adhesive was used. The pressure variation within this range did not significantly affect the strength of the dry veneer, but the strength of the wet veneers decreased as the bonding pressure increased. The type of failure varied, especially for the wet veneers. At high pressure, the wood were stronger than the cohesive strength of the adhesive and the strength of the adhesion between the adhesive and the wood. High pressure, however, caused a compression of the bond-line and resulted in a lack of adhesion.
ISSN:1748-0272
1748-0280
1748-0280
DOI:10.1080/17480272.2022.2051205