Last years the reduced weight cell panel with the trade mark of Dendrolight has obtained the wide world identification due both opening new factory in Austria and intention to open a factory of reduced weight cell panel in Latvia. Up to now Dendrolight type cell panels have been produced from the internal layer of spruce solid timber and plywood, solid timber, particleboard or the external layers of other material. The density of panels of this type is reduced by sawing grooves into the internal boards of the solid timber. As a result of it the internal layer obtains cell structure. The research on the reduced weight cell panel made of aspen (Populus tremula L.) wood has been initiated. The reduced weight cell panel of different types has wide application in furniture industry, internal cladding, door production, transport manufacturing industry and construction panel production as well. The essential importance of the research is to make out the usage possibilities of aspen wood which is a common broad-leaved tree in Latvia as an alternative material for spruce in production of the reduced weight cell panel. The aim of the research: to investigate the physical and mechanical properties of aspen cell panel covered by aspen and plywood. In the production of Dendrolight type panel from aspen wood the following raw materials were used: finger jointed aspen half-finished product – for aspen internal layer producing; finger jointed aspen half-finished product and three – layer birch plywood for external layer producing. There were used adhesives of two types for internal and external layer gluing: polyurethane adhesive DANA PU 2116 and polyvinyl acetate adhesive DANAFIX 447. The test of the newly obtained aspen panel was carried out in accordance with the current test standards for panel and timber tests. The following panel parameters were determined: moisture content (LVS EN 322), density (LVS EN 323), swelling in thickness after immersion in water (LVS EN 312), tensile strength (LVS EN 319), three-point bending strength and modulus of elasticity (LVS EN 310), four-point bending strength (LVS EN 408 p.13).
Relevant conclusions: Dendrolight type panels produced from aspen wood obtain the average density of 325 kg m-3 (external layer of aspen wood) and 358 kg m-3 (external layer of plywood). There are 2 % thickness swelling of aspen cell panels after 24 hour immersion in water, identical as spruce cell panels, with spruce external layer. There are good correlation between three-point bending strength and modulus of elasticity. With good results aspen wood can be used in reduces weight cell panel production.
Keywords: dendrolight, aspen, panel
Authors
Iejavs J.
Department of Wood Processing, Forest Faculty, Latvia Univesity of Agriculture, Latvia, Jelgava
Spulle U.
Department of Wood Processing, Forest Faculty, Latvia Univesity of Agriculture, Latvia, Jelgava
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