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( Sena Maulana ),( Muhammad Iqbal Maulana ),( Marwanto ),( Yuarsa Gumelar ),( Wahyu Hidayat ),( Nyoman Jaya Wistara ),( Ihak Sumardi ),( Fauzi Febrianto ),( Nam Hun Kim ) 한국목재공학회 2019 한국목재공학회 학술발표논문집 Vol.2019 No.1
The objective of this study was to evaluate the properties of bamboo oriented strand board (BOSB) from betung (Dendrocalamus asper ) bamboo using destructive and non-destructive methods under various shelling ratio and resin content. Strands were vacuum-treated at 126 ºC for 1 h under 0.14 MPa pressure and followed by washing with 1% NaOH solution. Three-layer BOSB (face:core:back) layers with the core layer perpendicular to the surface was formed with 15:70:15; 20:60:20; 25:50:25; 30:40:30 weight ratio and binded with 7 and 8% of phenol formaldehyde (PF) resin with the addition of 1% of wax. The evaluation of physical and mechanical properties of the boards was conducted in accordance with the JIS A 5908:2003 standard and compared with CSA 0437.0 standard for commercial OSB (Grade O-1). The results showed that BOSBs manufactured using 8% resin content with various core-to-face layer ratios had better physical and mechanical properties than using 7% resin content. Increasing core layer ratio increased the strength of BOSBs parallel to the grain. The face:core:back layers ratio of 25:50:25 could be used as a simple way to reduce PF resin requirements from 8% to 7%. Testing of non-destructive mechanical properties in betung BOSB has a high correlation with destructive testing.
Effects of Steam Treatment on Physical and Mechanical Properties of Bamboo Oriented Strand Board
Sena Maulana,Imam Busyra,Adesna Fatrawana,Wahyu Hidayat,Rita Kartika Sari,Ihak Sumardi,I Nyoman Jaya Wistara,Seung Hwan Lee,Nam Hun Kim,Fauzi Febrianto 한국목재공학회 2017 목재공학 Vol.45 No.6
The objective of this study was to evaluate the properties of bamboo oriented strand board (B-OSB) from an-dong (Gigantochloa psedoarundinacea) and betung (Dendrocalamus asper) with and without steam treatment. Strands were steam-treated at 126℃ for 1 h under 0.14 MPa pressure. The extractive content of bamboo strands before and after steam treatment were determined according to a standard (TAPPI T 204 om-88). Three-layer B-OSB with the core layer perpendicular to the surface and back layers were formed and binded with 8% of phenol formaldehyde (PF) resin with the addition of 1% of wax. The evaluation of physical and mechanical properties of the boards were conducted in accordance with the JIS A 5908:2003 standard. The results showed that steam treatment of bamboo strands significantly reduced the extractive content. Steam treatment tended to increase the dimensional stability and mechanical properties of B-OSB from andong and betung. The results showed that the dimensional stability and bending strength of B-OSB from betung was higher than those of andong. The internal bond strength of B-OSB from andong was higher than betung owing to a greater amount of extractives dissolved during the steam treatment.
( Sena Maulana ),( Yuarsa Gumelar ),( Adesna Fatrawana ),( Muhammad Iqbal Maulana ),( Wahyu Hidayat ),( Ihak Sumardi ),( Nyoman Jaya Wistara ),( Seung Hwan Lee ),( Nam Hun Kim ),( Fauzi Febrianto ) 한국목재공학회 2019 목재공학 Vol.47 No.4
The objectives of this study were to evaluate the effects of shelling ratio and resin content on the properties of bamboo oriented strand board (BOSB) from betung (Dendrocalamus asper) and to determine the correlation between the results of dynamic and static bending tests. Strands were steam-treated at 126 ºC for 1 h under 0.14 MPa pressure and followed by washing with 1% NaOH solution. Three-layer BOSB with the core layer perpendicular to the surface was formed with shelling ratios (face:core ratio) of 30:70; 40:60; 50:50; 60:40 and binded with 7% and 8% of phenol formaldehyde (PF) resin with the addition of 1% of wax. The evaluation of physical and mechanical properties of BOSB was conducted in accordance with the JIS A 5908:2003 standard and the results were compared with CSA 0437.0 standard for commercial OSB (Grade O-1). Non-destructive testing was conducted using Metriguard Model 239A Stress Wave Timer which has a wave propagation time from 1 to 9,999 μs and a resolution of 1 μs. BOSB with 8% resin content showed better physical and mechanical properties than those with 7% resin content. The increase of the face layer ratio improved the strength of BOSB in parallel direction to the grain. The results suggested that shelling ratio of 50:50 could be used as a simple way to reduce PF resin requirements from 8% to 7% and to meet the requirements of CSA 0437.0 standard. The results of non-destructive and destructive tests showed a strong correlation, suggesting that non-destructive test can be used to estimate the bending properties of BOSB.
< 전시-P-51 > Properties of Oriented Strand Board via Destructive and Non-destructive Test
( Sena Maulana ),( Rima V Ningsih ),( Fauzi Febrianto ),( I Nyoman J Wistara ),( Ihak Sumardi ) 한국목재공학회 2018 한국목재공학회 학술발표논문집 Vol.2018 No.1
Bamboo resources in Indonesia is abundant and have big potential to be development. Bamboo has been used as raw material for industry or construction. However bamboo also has some limitations when used for construction material, due to its diameter. Oriented strand board (OSB) is one of the alternative to increase the efficient utilization of bamboo for construction material. The objective of this study was to evaluate the properties of OSB on various shelling ratio and to evaluate the relation of mechanical properties of OSB via destructive and non-destructive testing. Strands were steamed at 126 oC for 1 h under 0.14 MPa. Three-layer OSB with core layer perpendicular to the surface and back layers were formed and binded with 8% of phenol formaldehyde (PF) resin with the addition of 1% of wax. Shelling ratio investigation of OSB was carried out by several types of strand with the ratio of face and core layer were 50:50, 55:45, 60:40, 65:35, 70:30, and 75:25 based on the strand oven dry weight on percent. From the result show that physical and mechanical properties of OSB that treated by steam was meet the requirement of CSA 0437 (Grade O-2) and EN 300 (Grade 2) standard. Non-destructive test using simple regression analyze was performed to analyze the statistic modulus elasticity (MOEs), modulus of rupture (MOR) of several shelling ratio. At shelling ratio 70:30 and 75:25 with parallel direction have higher mechanical properties as compared to perpendicular direction. OSB treated by steam has lower emission as compared to untreated OSB.
( Muhammad Iqbal Maulana ),( Rio Ardiansyah Murda ),( Sena Maulana ) 한국목재공학회 2019 한국목재공학회 학술발표논문집 Vol.2019 No.1
The objective of this study was to determine the effect of sodium hydroxide concentration in steam modification process on properties of betung bamboo oriented strand board (OSB). Strands were subjected to steam treatment at 126 ºC for 1 h under 0.14 MPa pressure and followed by rinse 1-5% sodium hidroxide solution. The alteration of structural and non-structural chemical components content of bamboo’s strands were evaluated. Three-layer OSB manufactured with 0.7 g cm-3target density binded with 8% of phenolformaldehyde resin with the addition of 1% of wax. The evaluation of physical and mechanical properties of the OSB was conducted in accordance to the JIS A 5908:2003 standard. Steam and rinsing treatment with various concentration of sodium hydroxide solution considerably reduced the extractive content of bamboo strands, and it affected the structural component of the strand in the smaller degree. Physical properties such as moisture content, water arbsorption, thickness swelling and mechanical properties such as internal bond, modulus of elasticity, and modulus of rupture increased significantly by rinsing treatment of sodium hydroxide solution up to 3% concentration. However, the degradation of chemical components by rinsing treatment of 4% and 5% sodium hydroxide solution reduced the physical and mechanical properties of OSB. The highest physical and mechanical properties of OSB was obtained by steam and rinsing treatments with 3% concentration of sodium hydroxide solution.
< 전시-P-53 > Physical and Mechanical Properties Of Hybrid Bamboo Oriented Strand Board
( Fauzi Febrianto ),( Sena Maulana ),( Muhammad Iqbal Maulana ),( Marwanto ),( Soleh Muhammad ),( Rika Kartika Sari ),( Wahyu Hidayat ),( Nam Hun Kim ) 한국목재공학회 2019 한국목재공학회 학술발표논문집 Vol.2019 No.1
Betung and andong bamboos have been known as good raw material of oriented strand board (OSB) due to its great physical and mechanical properties in the each single species OSB. In order to enhance the utillization of these bamboo, hybrid OSB made from combination of betung and andong bamboos were developed. In this study, the physical and mechanical properties of hybrid OSB at different face:core:back ratios were observed. Betung and andong strands were prepared manually using sharp knife and scissor. Three layered hybrid OSB with 0.7 g cm<sup>-3</sup> target density and 8% phenol formaldehyde resin content were manufactured. The face:core:back ratios of hybrid OSB were set to 15:70:15; 20:60:20; 25:50:25; and 30:40:30, with betung bamboo as face layer and andong bamboo as core. Addition of 1% paraffin based on oven dried strands was applied. Physical and mechanical properties of hybrid OSB was evaluated in accordance to the JIS A 5908:2003 standard. The results showed that hybrid OSB with 25:50:25 shelling ratio has optimum mechanical properties. Hybrid OSB made from betung bamboo as face and andong bamboo as core layer has lower gap between mechanical properties in the parallel and perpendicular to face orientation compared to each betung and andong single species OSB.
( Fauzi Febrianto ),( Dini Lestari ),( Adesna Fatrawana ),( Sena Maulana ),( Rita Kartikasari ),( I Nyoman Jaya Wistara ),( Deded Sarip Nawawi ),( Nam Hun Kim ) 韓國木材工學會 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.
< 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.