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Fukuoka-shi, Japan

Kang S.-G.,Laboratory of Wood Science | Kang S.-G.,Chungnam National University | Choi C.,Laboratory of Wood Science | Choi C.,Chungnam National University | And 9 more authors.
Journal of the Faculty of Agriculture, Kyushu University | Year: 2015

This study was performed to evaluate the suitability and burning characteristics of thermally-modified wood for use as auto camping charcoal. Four aspects of the burning were measured using a cone calorimeter: ignition time, total heat released, heat release rate, and flame-out time. In addition, elemental analysis was carried out using an elemental analyzer. Thermally-modified wood has short ignition and flame-out times because of its low Oxygen/Carbon rate. The total heat released and the heat release rate of thermally-modified wood is higher than that of other wood due to its low oxygen and nitrogen rate and high HHV (Higher Heating Values). With a shorter flame-out time, carbonization takes less time, and the maintenance time is longer. These characteristics of thermally-modified wood make it favorable for use as auto camping charcoal.

Kang S.-G.,Laboratory of Wood Science | Kang S.-G.,Chungnam National University | Lee S.-A.,Laboratory of Wood Science | Lee S.-A.,Chungnam National University | And 5 more authors.
Journal of the Faculty of Agriculture, Kyushu University | Year: 2015

The heat transfer and thermal efficiency of Paulownia coreana (low-density wood) and high-density fiber board were measured via a comparative analysis of heat transfer, and the suitability of the wood as a finishing material was evaluated. A comparative analysis of heat transfer is calculated by verifying the heat transfer and change in temperature of the water bottle both inside and outside of the sample box. The total transferred heat is then divided by conduction, convection, and radiation. The results show 18.05 W of heat was transferred to water bottle in the low-density Paulownia coreana UYEKI, and 12.5 W in the high-density fiberboard. The total heat from the heating source was 30 W. This indicates that a heat loss of low density wood was smaller than that of high density fiberboard. A difference was found in the amount of heat transferred, with a majority due to radiation: 0.02 W of conduction, 1.5 W of convection, and 3.98 W of radiation. These results indicate that the low density wood is appropriate for use as a thermal insulation building material.

Kang C.-W.,Laboratory of Wood Science | Kang C.-W.,Chonbuk National University | Jin T.,Laboratory of Wood Science | Jin T.,Chonbuk National University | And 7 more authors.
Journal of the Faculty of Agriculture, Kyushu University | Year: 2015

To assess changes in the mechanical properties of wood treated with furfuryl alcohol, the static modulus of elasticity, the dynamic modulus of elasticity and some physical properties of pine and larch wood were estimated before and after furfuryl alcohol treatment. The possibility of reducing floor noise by using furfuryl alcohol-treated wood was also evaluated. In comparison to untreated specimens, furfuryl alcohol-treated wood exhibited a color change from yellow to slightly brown, and swelling and water absorption ratios were significantly reduced. Furthermore, the specific gravity, static MOE and dynamic MOE were enhanced while the natural frequency was reduced. The correlation coefficient between the dynamic modulus of elasticity and the static modulus of elasticity for furfuryl alcohol-treated specimens and for control specimens were 0.90 and 0.92, respectively. The dynamic MOE to specific gravity ratio (dMOE/r) and the static MOE to density ratio (sMOE/r) both decreased as a result of furfuryl alcohol treatment. The furfuryl alcohol-treated wood could contribute to a decrease in noise if used as flooring material.

Park H.-J.,Laboratory of Wood Science | Park H.-J.,Research Institute of Human Ecology | Wen M.-Y.,Laboratory of Wood Science | Wen M.-Y.,Research Institute of Human Ecology | And 6 more authors.
Journal of the Faculty of Agriculture, Kyushu University | Year: 2015

An intumescent fire retardant was synthesized with of ammonium phosphate polymer (APP), guanyl urea phosphate (GUP) as main components. And Korean pine (Pinns koraiensis) was impregnated with this fire retardant by a vacuum-pressure process. The fire retardant performance of treated Korean pine wood with various chemical uptakes was assessed by cone calorimeter. The combustion parameters, including heating release rate (HRR), total heat release (THR), effective heat of combustion (EHC), total mass loss (TML), smoke production rate (SPR) and yield of CO (CO Y) were recorded simultaneously. To trace the combustion behavior, thermal degradation behavior was analyzed by thermogravimetry (TG). The results indicated that when the uptake of fire retardant chemical above 0.118g/cm3, treated Korean pine wood could meet the fire retardant criterion. Heat release was lowered and heat release rate slow down significantly. TG analysis showed that fire retardant treatment increased thermal stabilization, accelerated carbonization and lowered the decomposition temperature of wood(< 300°C). Wood cellulose decomposed toward carbonation direction at lower temperature, producing more char and correspondingly less flammable volatiles.

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