Stranding Moso and Guadua Bamboo. Part II. Strand Surface Roughness and Classification

In this study OSB strands produced by a CAE 6/36 disk flaker from resaturated moso and guadua bamboo tissue were classified by surface quality and compared with industrial aspen OSB strands. Strands were first classified into three groups based on surface appearance and texture. The topographic features that characterize the surface were then measured using a laser surface profiler to give two surface roughness indicators; average roughness (Ra) and average maximum roughness (Rz). Guadua strand surface quality was extremely poor compared to moso due to its very large, dense vascular bundles. Ra and Rz values for many bamboo strands, particularly guadua, exceeded the typical diameter of resin droplets dispensed during industrial OSB blending, meaning that excessive roughness could compromise bonding efficiency in bamboo OSB.