Assessment of mechanical properties of wood-leather panels and the differences in the panel structure by means of X-ray computed tomography
S. Wieland, T. Gruenewald, S. Ostrowski, B. Plank, G. Standfest, B. Mies, A. Petutschnigg - Assessment of mechanical properties of wood-leather panels and the differences in the panel structure by means of X-ray computed tomography - BioResources, Vol. 8, No. 1, 2013, pp. 818-832
The increasing use of wood puts considerable pressure on conventional wood-processing industries. Therefore, recent developments in the field of wood-based panels seek to find new raw material sources. A promising new material are wet-white and wet-blue leather shavings as they offer a high availability and cost competitiveness compared to wood, and they also lead to interesting new properties. In order to determine a new field of application fiberboards with a density of 700 kg/m³, and a resin load of 12% were produced with varying contents of wet-blue and wet-white leather particles; these panel composites were characterized with regard to the their internal bond, modulus of elasticity and modulus of rupture. Furthermore, the micro-structure of selected panels was investigated by X-Ray computed tomography (CT). Different phases within the CT data were segmented using thresholding algorithms, and the pore size distribution of the panels was analyzed. An important finding was that there is a substantial difference due to the incorporation of leather particles. For fiberboard, the internal bond strength increased with rising leather particle content, whereas other mechanical properties dropped. The CT analysis showed that there is a huge difference in the pore size distribution and the number of pores for the different materials. This indicates that the differences visible in mechanical testing were induced by the different geometry of the constituents.