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( Fauzi Febrianto ),( Dini Lestari ),( Adesna Fatrawana ),( Sena Maulana ),( Rita Kartikasari ),( I Nyoman Jaya Wistara ),( Deded Sarip Nawawi ),( Nam Hun Kim ) 한국목재공학회 2017 한국목재공학회 학술발표논문집 Vol.2017 No.1
Dimensional stability and strength of bamboo oriented strand board (BOSB) were much improved when bamboo strands were steamed pre-treated prior to be mixed with adhesive. However, the treatment is still needs to be improved due to some extractives were still accumulated on the surfaces of strands. The objectives of this research were to evaluate physical, mechanical and durability properties of BOSB prepared from modified steam treatment of betung bamboo strand (Dendrocalamus asper) and chemical composition change during the treatment. Three layers of BOSB were prepared and the ratio of surface, core and back layer was set 1:1:1. The strands were steamed at closed tank at certain condition. Some strands were washed with distilled and NaOH 1% solution. Paraffin in amount of 1 % was added. A rotary drum blender was used for mixing the strands and 8% PF adhesive. The mat-form was hot-pressed at 135 ℃ for 10 min at a pressure of 2.5 MPa to fabricate BOSBs. The board was then conditioned for two weeks in a room condition. For comparison, BOSB prepared from strands preserved with 3% borax preservative was also developed. Steam treatment greatly improved dimensional stabilization i.e. water absorption (WA) and thickness swelling (TS) and mechanical properties i.e. MOE, MOR and internal bond (IB) of BOSB. Washing strands with NaOH 1% solution after steamed treatment resulted in better improvement of those parameters than washing with distilled water. BOSB resulted from the above modified steam processes also improved its durability against termite attacked. Extractives, holocellulose and lignin of bamboo reduced and pH value and alpha cellulose increased after applying steam. Durability class of BOSB obtained in this experiment was equal with using 3% borax preservative.
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< 구두-C-05 > Durability of Bamboo Oriented Strand Board against Insect, Fungi, and Weather
( Fauzi Febrianto ),( Muhammad Anchu Kastian Asmur ),( Sena Maulana ),( Dini Lestari ),( M Qola A Damanik ),( Elis Nina Herliyana ),( Nam Hun Kim ) 한국목재공학회 2018 한국목재공학회 학술발표논문집 Vol.2018 No.1
Bamboo oriented strand board (BOSB) is composite board composed of thin bamboo strand that was glued and hot pressed for structural application. In exterior application, BOSB will interact directly with deterioration factors such as physical (weathering) and biology (decay and powder post beetles). The objectives were to evaluate the physical, mechanical and durability of BOSB before and after baited to white rot decay Schizophyllum commune and powder post beetles, and before and after exposure to natural weathering. Prior to be mixed with PF adhesive, the strands were steam pre-treated in closed chamber at certain conditions with or without rinsed by distilled water and NaOH 1% solution. PF adhesive in amount of 8% and 1% of wax based on OD weight of strand were used. The ratio for face, core and back layers of BOSB were set at 1:1:1. It is clear that the physical, mechanical and durability against fungi, insect and natural weathering of BOSB were much influenced by steam treatment. Gradually, during 6 months exposure to natural weather the physical and mechanical properties of BOSB dropped significantly. Steam treatment on bamboo strand improved the physical, mechanical and durability properties of BOSB. Steam treatment followed by washing with NaOH 1% gave the best results on all parameters measured. Steam treatment followed by washing with NaOH 1% after exposure for 6 months had MOE and MOR parallel to grain direction fulfilled CSA 0437.0 (Grade 0-1) standard. BOSB prepared from steam treatment followed by washing with 1% NaOH solution belongs to 2nd grades on fungi resistance.
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