The SEM micrographs of OPB samples in Figs. 5 of convection drying (a) 50C, (b) 60C, (c) 80C and (d) 100C is show fissure between vascular bundle with parenchyma ground tissue, because of the vascular bundles component was distinguished of fibres and vessels and filled the area surrounded by parenchyma cells. The vascular bundles is strength than parenchyma cell, as well as less shrinkage. At higher the temperature to dehydrate quickly by convection. the tissue comprising cells absorb water. It causes large fissure in tissue, see Figure 5 (d) shows the fissure larger than the figure 5 (a). Further,