Prediction of oriented strand board properties from mat formation and compression operating conditions. Part 2: MOE prediction and process optimization |
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Authors: | Greer Painter Hector Budman Mark Pritzker |
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Institution: | (1) Department of Chemical Engineering, University of Waterloo, N2L 3G1 Waterloo, ON, Canada |
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Abstract: | A model to predict the bending modulus of elasticity (MOE) of oriented strand board (OSB) panels produced by batch processing
is presented. The approach developed herein is unique in its comprehensiveness since the MOE is determined from information
on the panel structure, temperature and moisture profiles and vertical density profiles obtained from the mat formation and
compression models presented in Part 1. Comparison of predicted MOE values with those measured from 24 commercially produced
panels shows good agreement considering some of the uncertainties involved. Simulations show that the MOE can be increased
by any of the following changes: reduced fines content, increased panel density, better flake alignment in each of the three
layers within a panel, increased flake length and a larger difference between the density of the face and core layers. The
model was also used in a genetic algorithm to carry out an optimization study of batch OSB manufacturing. This analysis showed
that by combining the appropriate reduction in the amount of flakes used, increase in fines content, improvement in flake
alignment within each of the face and core layers and shortening of the batch time, a significant theoretical profit increase
from the base case scenario can be obtained. |
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Keywords: | |
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