Some important properties of strandboard manufactured from bamboo
2006
Sumardi, I. | Suzuki, S. | Ono, K.
Bamboo has received increasing attention as an alternative raw material for use in the manufacture of composite boards. Random strandboards were made using a moso bamboo (Pyllostachys pubescent Mezel) strand to evaluate the effects of manufacturing parameters. Bamboo random strandboards were fabricated using phenol-formaldehyde resin with four dosage levels ranging from 4 to 10 percent, and five density levels ranging from 0.49 g/cm3 to 0.81 g/cm3. The mechanical properties and dimensional stability of bamboo strandboard were evaluated, and the results were summarized as follows. The bending properties and internal bond (IB) strength of the board increased with increasing density, showing a bilinear relation with an elbow at a density of 0.57 g/cm3, where the compaction ratio was approximately unity. Similar results were obtained in wet conditions. IB strength retention after the boil treatment remained almost constant, regardless of board density. The bending properties were slightly affected by resin content (RC). Although the IB strength increased with RC, IB strength seemed insufficient in comparison with that required for practical performance, which suggests that the glue blending technology needs to be improved. Thickness swelling (TS) decreased with increasing RC at each step of the wet-dry cyclic treatment. The TS of a board with 8 percent RC was approximately 7 percent after the treatment. Linear expansion per unit moisture content change (LE/MC) increased with increasing density from 0.016%/% at 0.49 g/cm3 to 0.023 %/% at 0.81 g/cm3, while the effect of RC on LE/MC was not remarkable in this range of RC.
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