Invention of light weight panel with trade mark of Dendrolight is one of the most distinguished wood industry innovations of last decade. At present three layers cellular wood panels have wide non structural application in furniture and door industry. For further product development study on cellular wood material gluability with other wood based materials was necessary. The aim of the research was to evaluate the gluability and bonding quality of pine (Pinus Sylvestris L.) cellular wood material with solid wood (pine, ash and thermally and mechanically treated grey alder) and wood based panels (oriented strand board, high density fibreboard and birch plywood). Thermoplastic polyvinyl acetate adhesives are typical for three layer cellular panel gluing. To increase the thermal resistance of the products emulsion polymer isocyanate Kleiberit EPI 304.4 and polyurethane Kleiberit PUR 501 adhesives were evaluated as binders for three layer cellular wood panel production. There were 15 specimens manufactured of each of twelve cellular wood material, adhesives and top layer materials combinations. To evaluate bonding quality of panels tensile strength perpendicular to the plane of the panels was evaluated according to standard LVS EN 319:2000. Fracture mode of the glued joint as extra parameter was evaluated. The initial research shows that emulsion polymer isocyanate and polyurethane adhesives with good results can be used for three layer cellular wood material production for both solid timber and wood based panels. The average tensile strength perpendicular to the plane of the panels varies from 0.31 N/mm2 (panels with oriented strand board top layers) to 1 N/mm2 (panels with pine or plywood top layers). Top layer significantly influences the fracture mode of the three layer cellular wood panels.
Keywords: dendrolight, sandwich panel, gluability
Authors
Iejavs J.
Wood Processing Department, Forest Faculty, Latvia University of Agriculture and Forest
Wood Product Research and Development Institute, Jelgava, Latvia
Jakovlevs V.
Wood Processing Department, Forest Faculty, Latvia University of Agriculture and Forest
Wood Product Research and Development Institute, Jelgava, Latvia
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