Physical and mechanical properties of mixed comrind and hardwood oriented strandboard bonded with phenol-formaldehyde resin
2005
Han, G. | Wu, Q. | Duan, X.
Three-layer mixed comrind (CRD) and hardwood oriented strandboard (OSB) were manufactured using phenol-formaldehyde (PF) resin with comrind used in the core layer. The effects of comrind and wood (face and core materials) content on panel properties were examined. The values of flake percent alignment (PA) varied from 44 to 63 percent for different types of boards. Pure comrind boards had the highest PA value among all tested panels. The density profiles through panel thickness revealed that boards with 45 percent fines in the core layer had a considerable density gradient. Generally, density gradients increased with increased fines contents in the core layer. Linear expansion and thickness swelling were improved by using comrind to replace part of the wood material in the core layer. Internal bond strength showed little decrease as CRD content increased up to 22.5 percent for boards made of core material and CRD combination in the core layer. Bending properties of the boards with wood face material and CRD combination in the core layer reduced little when the CRD content was below 22.5 percent. At lower relative humidity levels, pure CRD OSB showed lower equilibrium moisture content values compared to wood OSB for both absorption and desorption. Nelson's sorption model provided an excellent fit to the sorption data for both panel types.
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