Reducing resin content and board density without adversely affecting the mechanical properties of particleboard through controlling particle size |
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Authors: | Mohammad Arabi Mehdi Faezipour and Heydar Gholizadeh |
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Institution: | (1) Department of Wood & Paper Science and Technology, Faculty of Natural Resources, University of Tehran, P.O. Box 4111, Karaj, 31587-77871, Iran |
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Abstract: | Density and resin content are two factors that have a significant effect on the production cost of wood composite. However,
particle size affects resin content and density, which suggests that the interaction of these three factors can be manipulated
to reduce the board density and resin content of particleboard without adversely influencing its mechanical properties. Some
mathematical functional forms based on resin content, board density and slenderness ratio were regressed and an appropriate
form was chosen. According to analysis of the results using SHAZAM 9 software, the exponential function best fit the experimental
data. Finally, “indifference curves” of mechanical properties were illustrated and analyzed. The results indicated that negative
effects of density or resin content reduction on mechanical properties could be compensated for by controlling particles’
slenderness ratio. Interestingly, increases in slenderness ratio compensated for the negative effects of decreases in resin
content or board density on module of rupture (MOR) and module of elasticity (MOE). Moreover, this “compensation ratio” intensified
as resin content or density decreased and/or as the MOR or MOE increased. On the other hand, reduction in slenderness ratio
indicated a complementary effect on reducing internal bond (IB) strength, a result of decreases in resin content or density.
Moreover, this “complementary ratio” was intensified as resin content or density decreased and/or as IB strength increased. |
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