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Hermawan A.,Laboratory of Wood Material Technology | Hermawan A.,Kyushu University | Ohuchi T.,Laboratory of Wood Material Technology | Ohuchi T.,Fukuoka University of Education | Fujimoto N.,Laboratory of Wood Material Technology
Journal of the Faculty of Agriculture, Kyushu University | Year: 2010

The objective of this study was to evaluate the physical and mechanical properties of strand board bonded with disposal expanded polystyrene (EPS) as binder. The strand board was manufactured using strand made from Douglas-fir beams selected from construction scrap wood. The strands were oriented, and two types of three-layer (face-core-face) strand board were manufactured: one in which the board bonded with only disposal EPS (P board), and the other in which the board bonded with disposal EPS after isocyanate compound adhesive was applied to the strand (M board). The physical and mechanical properties of the boards were evaluated based on the Japanese Industrial Standard for Particleboards (JIS A 5908). The main results obtained were as follows: bending strength properties and internal bond (IB) strength of P board had larger than those of type 18 PB and 24-10 PB standard. However, thickness swelling (TS) of the board was large, and the problem in water-proof property of the board remained. Bending strength properties, IB strength and TS of M board were larger than those of type 24-10 PB standard. The performance of M board showed equal or larger performance than those of control board. Source


Lin H.C.,Laboratory of Wood Material Technology | Liou J.-F.,Laboratory of Wood Material Technology | Liou J.-F.,National Chiayi University | Lee W.-J.,Laboratory of Wood Material Technology | And 6 more authors.
Journal of the Faculty of Agriculture, Kyushu University | Year: 2015

To develop Wood-Based Activated Carbon Fibers Paperboard (WACFP) as a moisture-proof material for food use, Nadelholz/Laubholz Unbleached Kraft Pulp (NUKP/LUKP) and cardboard from recycled cartons were used as precursors for the method of physical activation with steam to prepare activated carbon fibers (ACFs). The ACFs were evaluated by a preliminary safety evaluation (Ames Test) and reverse mutation assay (antimutagenic activity). The Survival (%) for Salmonella typhimurium TA98 and TA100, with or without the S9 mix (an external metabolic activation system) in the test range (1.0-5.0 mg/plate of ACFs), were all higher than those of a blank (control group) by more than 80%, and the ACFs for TA98 and TA100 with or without S9 did not exceed spontaneous revertants by more than two times, indicating the ACFs had no cytotoxicity or mutagenicity. The antimutagenicity against strains for the ACFs showed an insignificant difference between his+ revertants and the blank, suggesting the safety of the ACFs used primarily as a material for food use. WACFP was made by adding 10,30 and 50 wt% of ACFs using the Beating CNS 12495 Method combined with preparation by the Handsheets CNS 11212 Method. The hygroscopic ability of WACFP was investigated. The water activity of all WACFP was from 0.40 to 0.45. The hygroscopicity of WACFP was 18.74-26.50% and 5.43-6.36% for 90% and 40% relative humidity (RH), and was lower than that of silica gel, 37.20 and 11.70%. While the hygroscopicity was changed from an RH 90% of absorption to an RH 40% desorption, the percent of desorption for the WACFP was reduced faster than that for silica gel. This can demonstrate that the percent weight of the tested saturated WACFP with different temperature desorptions decreased faster than that of silica gel. As a result, WACFP using ACFs prepared from NUKP, LUKP or cardboard could be a potential moisture-proof material for food use. Source


Lin H.C.,Laboratory of Wood Material Technology | Hu J.-S.,Laboratory of Wood Material Technology | Hu J.-S.,National Chiayi University | Lee W.-J.,Laboratory of Wood Material Technology | And 8 more authors.
Journal of the Faculty of Agriculture, Kyushu University | Year: 2015

Sorghum distillery residue (SDR), one type of fermentation waste, was used as the precursor to prepare activated carbon (AC) using the method of physics activation with steam-or CO2-activation. The yield and iodine value of sorghum distillery residue activated carbon (SDRAC) was 15.74 to 29.24% and 113 to 684 mg/g using CO2-activation, as well as 10.63 to 26.07% and 548 to 770 mg/g using steam-activation. As the iodine value of SDRAC was above 700 mg/g, the methylene blue adsorption value was 143.56 to 344.87 mg/g, the BET specific surface area was 502.7 to 530.1 m2/g, the average pore diameter ranged from 2.89 to 3.18 nm and the true density was 1.86 to 1.97 g/cm3. The nitrogen adsorption-desorption isotherms of the SDRAC were classified as Type IV, indicating the presence of microporous and mesoporous structures, according to the Bruauer, Deming, Deming and Teller (BDDT) Classification, and were H3 type hysteresis loops for most of the mesoporous structures in accordance with the International Union of Pure and Applied Chemistry (IUPAC). SDR, with a suitable activation condition, can serve as an excellent precursor for preparing AC because the iodine value and the BET specific surface area of the resulting SDRAC can be reached at the commercial value. SDRAC is able to be applied to liquid absorption, such as water purification, due to its mesoporous structure. Source


Sato E.,Laboratory of Wood Material Technology | Sato E.,Fukuoka University of Education | Ohuchi T.,Laboratory of Wood Material Technology | Ohuchi T.,Fukuoka University of Education | Fujimoto N.,Laboratory of Wood Material Technology
Journal of the Faculty of Agriculture, Kyushu University | Year: 2010

In our previous study, the evaluation system for the finger-jointed laminae was constructed. This system was composed of three parts. The first part is the motive power part for the hydraulic pomp and cylinder. The second part is the AE measurement part. The third part is the data collection part which controls some devices and collects sampling data. In this study, the optimum condition needed in the evaluating test with this evaluation system was examined. In addition, the effects of the temperature and the open assembly time in finger jointing on the strength properties of the finger-jointed laminae with this evaluate system were examined. The main results are summarized as follows: The peak in the waveform of AE signals obtained by the evaluation system was recognized in the laminae with starved joint. The peak and the starved joint part were corresponded. In evaluation test of the finger-jointed laminae with this system, the necessary conditions set in this test were the deflection and the feed speed, and these optimum conditions were 3 mm and high speed (480 mm/s), respectively. The strength properties of the finger-jointed laminae with the open assembly time showed the tendency to decrease with higher the temperature in jointing. Therefore, it became clear that the high temperature in jointing was the condition that the starved joint part was caused. The MOE and MOR of the finger-jointed laminae showed the tendency to decrease with increasing the maximum value of the AE accumulated signal. Thus, it was clear that there was a high correlation between the maximum value and the strength properties. Therefore, this evaluation system was promising for the detection of the difference of the bonding performance caused by the influence of bonding conditions such as the temperature and the open assembly time in jointing. Source

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