Effect of Layer Orientation Composition on the Properties of Bamboo Composites Lumber

The objective of this study was to determine the effect of layer orientation composition on the properties of bamboo compositelumber(BCL).BamboostripsforBCLfabricationwerepreparedfrommatureculms(±4yearsold)of andong bamboo ( ) collected from private gardens in West Java. The stripswerepre-treatedbysoakingitin7%boronsolutionfor2hours.Five-layerBCLsweremanufacturedwith4different compositions of layer orientation. The BCL was manufactured using water based polymer-isocyanate (WBPI) adhesive. Thegluespreadandcoldpressingtimeappliedwere250g/m and45minutes,respectively. Resultsshowedthattheaveragedensity,moisturecontent,thicknessswelling,andwidthexpansionof BCLwere0.79 g/cm ,12.60%,2.38%,and1.13%,respectively.NodelaminationoccurredinallsamplesusingWBPIadhesive,which indicating high bonding quality. The average bonding strength (dry test) of BCL was 70.4 kg/cm . The physical and mechanical properties of BCL were significantly affected by layer orientation composition. The mechanical properties of BCLdecreasedasthenumberof cross-layerincreasedintheBCLstructure.Onthecontrary,thepresentof cross-layerin BCLstructureincreaseddimensionalstabilityof theproducedBCL.