Reuse of materials from waste streams is pertinent to achieving sustainable forest production. The enormous wood residues generated at sawmill and the disposal of wood based products poses threat not only to sustenance of the forest resources but also has negative adverse effect on the environment. Limitation exists in the utilization of wood residues as raw material for panel board production in developing countries. This study examined the physical and mechanical properties of graded density fiberboards produced from varying mixture of sawdust and corrugated paper (pulp) at Forestry Research Institute of Nigeria (FRIN) in 2019. A 2x9 factorial experiment in one way analysis of variance was used to test for significant difference between the factors (density and mixing ratio) considered. The result shows that densities of all boards produced varied with mixing proportions. The densities increased with increasing content of corrugated paper. Boards produced at 0.45 g/cm3 showed higher density (0.648 g/cm3), bending strength (MOR) (1.47 N/mm2) and less water absorption (118.69 %) than those produced at 0.65 g/cm3 having values of 0.58 g/cm3, 1.32 N/mm2 and 153.67 %  respectively. However boards produced at 0.65 g/cm3 had higher elasticity in bending (MOE) (209.19 N/mm2) and less thickness swelling (6.29 %) than those produced at 0.45 g/cm3 having values of 74.87 N/mm2 and 10.88% respectively. Panel G (20:60:20), E (30:50:20) and I (10:70:20) of sawdust: corrugated paper: urea formaldehyde respectively showed superior features in physical and mechanical properties with panel I been the best mixture. Conclusively, wood residues (sawdust and corrugated paper) are suitable raw material for fiberboard production.

With decrease in wood from the forest, non-wood fibres have attracted interest in the production of pulp and paper products in recent times due to their short growth cycles, moderate irrigation and fertilizer requirements as well as their low lignin content. The use of these plants will aid sustainable development in the pulp and paper industry. This study investigated leaf dimensions and fibre characteristics of Agave sisalana and how the leaf dimensions relates to its fibre characteristics. Leaves were collected from three sisal plant stands in Oyo State, Nigeria. The plant whorl was divided systematically into bottom, middle and top from which five leaves were randomly collected from each whorl position. The fibres of the leaves were extracted from which 2cm of fibres were taken from three positions on the leaf (top, middle and base). Extracted fibres were macerated and 3375 fibres were measured. The result shows that Agave sisalana leaves collected at the top had the longest length and was also widest at the base and middle. The average fibre length was 1.69 mm, while the fibre diameter, lumen width and cell wall thickness of Agave sisalana were 16.98 µm, 12.33 µm and 2.32 µm respectively. The slenderness ratio averaged 99.4 while the coefficient of flexibility averaged 72.61. The highest value of the runkel ratio of Agave sisalana was 0.42. There was significant negative correlation between leaf characteristics and fibre characteristics. Young sisal (Agave sisalana) leaves produced the best fibre characteristics suitable for the production of high quality paper.

Abstract. Ogunsanwo OY, Onakpoma I, Korede M. 2020. Thermal properties of wooden based flask from tropical hardwood species. Asian J For 4: 61-64. Most materials used for production of conventional thermos flask (metals and plastics) are not environment friendly with particular concerns about plastic which are not biodegradable. Wood waste management is important in producing environmentally friendly materials and achieving sustainable development in forestry through wood waste utilization as thermos flask. This study was therefore conducted to investigate the thermal properties of wooden thermos flask (WTF) using tropical hardwood species with a view to promoting the use of greener technology. Offcuts of Tectona grandis and Albizia saman were used to produce 12 WTF of two thicknesses (11 mm and 12 mm), with a height of 10.5'' using bamboo as inner lining. The heat loss and heat gain by the wooden flasks and conventional flask were collected using a thermometer which was inserted into the cap of the flasks through a hole drilled in it, the hole was covered at intervals to prevent heat loss and heat gain from the opening. Data was collected every two hours for twelve hours. The study was laid out in a 2×2 factorial experimental in a completely randomized design. Data were analyzed using ANOVA at p=0.05. The highest heat loss (64.00ºC) after 12 hours was observed in Tectona grandis WTF with 11 mm and 12 mm while Albizia saman thermos flask with 12 mm thickness had the least heat loss (62.00ºC). Metallic flask lost only about 30.00 ºC of its heat content after 12 hours. The highest heat gain (28ºC) after 12 hours was observed in Tectona grandis WTF with 11mm and 12mm while Albizia saman WTF with 11 mm thickness had the least heat gain (25.67ºC). Heat gained by WTF was 28.00ºC and 25.83ºC for Tectona grandis and Albizia saman respectively after 12 hours while heat gain by the metallic flask after 12 hours was 18.00ºC. Species and thickness did not significantly affect heat loss and gain of thermos flask. Significant difference was however observed between the heat lost and gained by WTF and metallic flask. Wooden thermos flask still retained heat and prevented loss to a certain degree but technological improvement would perform better.