The Effects of Some Manufacturing Variables on the Properties of Particleboard
The effects of type of wood furnish particle-board, specific gravity and press closing speed on properties of resultant particleboard were investigated. Tests were done in accordance with the provisions of ASTM D 1037 - 78 and property values compared with minimum values set by Commercial Standard - CS 236 - 66. Property values investigated were Modulus OJ Rupture (MOR) andModulus Of Elasticity (M.O.E.) in bending as well as the Internal Bond (IB). Data were analyzed using factorial analysis and regression analysis with Dummy Variables. Most variables and/or their interaction were found to have significantly (at 0.01 level) affected properties. Using compression ratio (ratio of particleboard specific gravity/furnish specific gravity), it was possible to arrive at equations, which gave predicted best estimates of M.O.R; M.O.E. and lB. Similarly, regression equations of compression ratio on M.O.R, M.O.E. and 1B show r = 0.790, r = 0.761 and r = - 0.263 respectively for boards made by fast closing speed while r = 0.601, r = 0.584 and r = -0.450 for slow closing speed, respectively. A student t- test between means of predicted values and experimental results were not significantly different (at 0.05 level) except for all maple board at 0.6 sp. gravity and 3-layer board at 0.7 sp. gravity both of which were made by slow press closing speed. All boards satisfied the provisions set in CS 236 - 66 except boards manufactured from Hard Maple shavings and exposed to the slow press closing speed treatment.