Keywords
Wall Thickness
Runkel Ratio
Flexibility ratio
Felting Coefficient
How to Cite
Abstract
Wood quality studies were carried out on the Newbouldia laevis collected from Lafia, Nasarawa State, Nigeria to ascertain their suitability for pulp and paper making. Samples were collected from 5%, 25%, 50%, 75% and 85%, of the whole length of each of the harvested stems (axial positions), while radial samples were collected from the core wood, middle wood, outer wood and bark. Physical parameters, ring width and fibre morphology such as fibre length, fibre diameter, lumen width, cell wall thickness, Runkel ratio, flexibility ratio and felting coefficient were studied on axial and radial directions in the 10 sampled. The study was laid out in a 5 x 4 x 10 factorial experiment in a completely randomized design (CRD). Mean pith diameter was 9.42±4.07mm, it increased significantly from base to top. Mean Bark thickness was 4.85±1.99mm, 24.96% bark proportion and 10.06% bast fibre proportion,
bark proportion significantly decreased from base upward. Grain orientation increased from base upward to the middle height of the stem and later decreased to the top. Significant between-tree variation was observed for ring width with a mean of 2.40±0.83mm, however, ring width consistently increased along the stem axis. The results of the fibre morphological characteristics showed that the mean fibre length was 2.31±0.49mm, 14.57±4.36µm lumen width, 19.54±1.95µm fibre diameter while the mean cell wall thickness was 2.48±2.14µm. Fibre length, lumen width and cell wall thickness varied significantly along
the stem axis at (p<0.05). There was homogeneity in the overall distribution of the measured indices within the trees. Newbouldia laevis fibre characteristics as reported in this study, showed that, they are well suited for tissue, corrugating medium, newsprint, and writing paper. However, detailed analysis should be conducted, this will enhance its suitability as a potential source of fibre wood pulp. Pulp and Paper industries should harness its potentials as it can be used to revive the Nigerian pulp and paper industry.
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