Use of a bioadhesive for the production of laminated veneer lumber: manufacturing and mechanical properties
DOI:
https://doi.org/10.20868/ade.2026.5721Keywords:
bioadhesive, lignin, compression, compression bending testAbstract
This study examines the manufacture and mechanical performance of laminated veneer lumber (LVL) panels made from I-214 poplar veneers and a formaldehyde-free bioadhesive derived from eucalyptus lignin. Fifteen-layer panels were produced and compared with panels bonded using a structural polyurethane adhesive. The experimental programme assessed workability, adhesive consumption, pressing and curing conditions, and the influence of moisture content. Compression and four-point bending tests were then performed in flatwise and edgewise configurations. Lignin developed effective bonding when its moisture content remained below 18%, reaching compressive strengths close to those of the conventional adhesive at moisture levels below 12%. In bending, lignin-bonded panels showed lower strength, particularly in the flatwise position, although their stiffness remained comparable and their failure was more progressive and ductile. The lignin-based bioadhesive therefore represents a more sustainable alternative for non-structural or moderately loaded applications. Reducing lignin polarity could improve adhesion and extend its potential use in structural laminated wood products.
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