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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Korean Wood Science and Technology
Journal Basic Information
Journal DOI :
The Korean Society of Wood Science Technology
Editor in Chief :
Volume & Issues
Volume 39, Issue 6 - Nov 2011
Volume 39, Issue 5 - Sep 2011
Volume 39, Issue 4 - Jul 2011
Volume 39, Issue 3 - May 2011
Volume 39, Issue 2 - Mar 2011
Volume 39, Issue 1 - Jan 2011
Selecting the target year
Preparation of Cellulose Nanofibrils and Their Applications: High Strength Nanopapers and Polymer Composite Films
Lee, Sun-Young ; Chun, Sang-Jin ; Doh, Geum-Hyun ; Lee, Soo ; Kim, Byung-Hoon ; Min, Kyung-Seon ; Kim, Seung-Chan ; Huh, Yoon-Seok ;
Journal of the Korean Wood Science and Technology, volume 39, issue 3, 2011, Pages 197~205
DOI : 10.5658/WOOD.2011.39.3.197
Cellulose nanofibrils (CNF) with 50~100 nm diameter were manufactured from micro-size cellulose by an application of a high-pressure homogenizer at 1,400 bar. High strength nanopapers were prepared over a filter paper by a vacuum filtration from CNF suspension. After reinforcing and dispersing CNF suspension, hydroxypropyl cellulose (HPC) and polyvinyl alcohol (PVA)-based composites were tailored by solvent- and film-casting methods, respectively. After 2, 4, 6 and 8 passes through high-pressure homogenizer, the tensile strength of the nanopapers were extremely high and increased linearly depending upon the pass number. Chemical modification of 1H, 1H, 2H, 2H-perfluorodecyl-triethoxysilane (PFDTES) on the nanopapers significantly increased the mechanical strength and water repellency. The reinforcement of 1, 3, and 5 wt% CNF to HPC and PVA resins also improved the mechanical properties of the both composites.
Hardness and Dimensional Stability of Radiata Pine (Pinus radiata D.Don) Heat-Compressed Wood - Effect of Press Temperature & Time -
Hwang, Sung-Wook ; Lee, Won-Hee ;
Journal of the Korean Wood Science and Technology, volume 39, issue 3, 2011, Pages 206~212
DOI : 10.5658/WOOD.2011.39.3.206
It was investigated the hardness and dimensional stability of heat-compressed wood by compression temperature and time. The surface hardness of heat-compressed wood increased with increasing compression temperature. The lowest hardness value (5.0 N/
) was observed in the temperature
while the highest value (15.6 N/
) was obtained in compression temperature
. Dimensional recovery test results showed that fixation of compression set improved with increasing compression temperature. However, the fixation effects were negligible by press time. Contact angle increased with increasing press temperature and time.
Species Identification and Tree-Ring Analysis of Wood Elements in Daesungjeon of Jipyeong Hyanggyo, Yangpyeong, Korea
Son, Byeong-Hwa ; Kim, Jung-Hun ; Nam, Tae-Kwang ; Lee, Kwang-Hee ; Park, Won-Kyu ;
Journal of the Korean Wood Science and Technology, volume 39, issue 3, 2011, Pages 213~220
DOI : 10.5658/WOOD.2011.39.3.213
The objective of this study is to conduct the species identification and tree-ring dating for the wood elements of Daesungjeon (main hall) in Jipyeong Hyanggyo, a Confucian shrine in Jije-myeon, Yangpyeong-gun, Gyeonggi-do, Korea. Major wood species for Daesung Hall was Pinus densiflora (88%) belonging to hard pine. The other species was P. koraiensis belonging to soft pine. One large beam and one collar beam with bark were dated to A.D. 1718 and 1720, suggesting either a large-scale repair or moving in 1720s as the record of an historical document 'Hakgyodeongrok'.
Development of Adhesive Resins Formulated with Rapeseed Flour Hydrolyzates for Laminated Veneer Lumber and Its Performance Evaluation
Yang, In ; Han, Gyu-Seong ; Choi, In-Gyu ; Kim, Yong-Hyun ; Ahn, Sye-Hee ; Oh, Sei-Chang ;
Journal of the Korean Wood Science and Technology, volume 39, issue 3, 2011, Pages 221~229
DOI : 10.5658/WOOD.2011.39.3.229
Due to the increase of oil price and the environmental issue such as the emission of volatile organic compounds, the necessity for developing alternative resins of petroleum-based adhesive resins, which have extensively been used for the manufacture of wood-based products, has been speculation since the early 1990. In our study, rapeseed flour (RSF), which is the by-product of bio-diesel produced from rapeseed, were hydrolyzed by enzymes. As a crosslinking agents of the RSF hydrolyzates, phenol-formaldehyde prepolymers (PF) were prepared. The RSF hydrolyzates and PF were mixed to complete the formulation of RSF-based adhesive resins, and the resins were applied to make the laminated veneer lumber (LVL). The physical and mechanical properties of the LVL were measured to examine whether RSF can be used as raw materials of adhesive resins for the fabrication of LVL or not. The average moisture content and soaking delamination rate of the LVL bonded with RSF-based adhesive resins exceeded the minimum requirement of KS standard. Moreover, thermal analysis of the RSF-based resins showed similar tendencies except for the RSF-based adhesive resins formulated with pectinase-hydrolyzed RSF. The bending strengths of the LVL were higher than that of the LVL made with commercial PF resins. These results showed the potential of RSF as a raw material of alternative adhesives for the production of LVL. Further works on the optimal conditions of RSF hydrolysis and spreading characteristics for RSF-based adhesive resins is required to improve the adhesive performance of RSF-based resins.
Charcoal Properties and Temperature Change of a Kiln's Inner and Outer Walls in Carbonization Process Using an Improved Kiln
Kwon, Gu-Joong ; Kwon, Sung-Min ; Jang, Jae-Hyuk ; Hwang, Won-Joung ; Kim, Nam-Hun ;
Journal of the Korean Wood Science and Technology, volume 39, issue 3, 2011, Pages 230~237
DOI : 10.5658/WOOD.2011.39.3.230
The study was performed to investigate the characteristics of charcoal and temperature change of a kiln's inner and outer walls in carbonization process using improved kiln. In this kiln system, carbonization process was completed in eight days. In the kiln, the ignition temperature was kept about
. And then the temperature were increased gradually prior to be refined. Finally, the temperature in refining process was reached to maximum point,
. In the chimney, the temperature was increased gradually from
at ignition to
at refining. The temperature change of the kiln wall resembles a temperature change progress curve during a carbonization process. The highest temperature of the kiln wall that appeared by a carbonization process was around
. As a result of having measured an inner wall and the outer wall of the kiln using an infrared thermography camera, it was judged with there being considerable latent heat on kiln wall and ceiling. Fixed carbon contented of charcoal was 85.9~89.9%. Refining degree of charcoal, hardness, calorific value and pH were l, 12, 7,047~7,456 kcal/kg, 9.0~9.9, respectively. The yield of wood charcoal was 13.8%, and compared to conventional kiln's yield increased 1.5%.
Change of Wood Color of Radiata Pine (Pinus radiata D.Don) by Press Temperature and Time
Hwang, Sung-Wook ; Lee, Won-Hee ;
Journal of the Korean Wood Science and Technology, volume 39, issue 3, 2011, Pages 238~243
DOI : 10.5658/WOOD.2011.39.3.238
This study was estimated the change of color of compressed wood by compression temperature and time. Wood color was measured using a colorimeter and evaluated by the NBS (National Bureau of Standards) unit. As a result, the whiteness decreased with increasing compression temperature. In contrast, redness and yellowness was increased with increasing compression temperature. All of the color difference showed the 'Very Much' by NBS unit. The whiteness decreased with increasing compression time. The redness and yellowness were insignificant effect on compression temperature. In other words, the effect of compression temperature was much greater than compression time in the change of wood color.
A Study on Combustion Characteristics of Fire Retardant Treated Pinus Densiflora and Pinus Koraiensis
Choi, Jung-Min ;
Journal of the Korean Wood Science and Technology, volume 39, issue 3, 2011, Pages 244~251
DOI : 10.5658/WOOD.2011.39.3.244
The combustion characteristics were evaluated for Japanese Red Pine (Pinus Densiflora) and Korean Pine (Pinus Koraensis). These two species are widely used as building member of Korea-style house and volume density of Japanese Red Pine is relatively higher than that of Korean Pine. The combustion characteristics are closely connected with volume density. The differences of two species in both total heat release (THR) and average heat release rate (HRR) seemed to be resulted from the volume density. Toxicity of smoke from the specimens was increased because of fire-retardant treatment.
Predicting the Withdrawal Load of Wood Screws in Domestic Wood by Screw Diameter, Depth of Penetration and Specific Gravity of Wood
Cha, Jae-Kyung ;
Journal of the Korean Wood Science and Technology, volume 39, issue 3, 2011, Pages 252~257
DOI : 10.5658/WOOD.2011.39.3.252
Tests were carried out on domestic wood samples to modify the formula which had previously been developed to predict the withdrawal strength of screw on the face of lumber. Screw sizes were No. 6, 8 and 10 used in this study. Predicted equations were fitted to the results of different length of No. 8 wood screw. The withdrawal strength of screws was enabled to predicted as a function of screw diameter, depth of penetration, and specific gravity of wood. Predicted equation was under-predicted the withdrawal strength of 25 and 30 mm length of screw within 5% and over-predicted withdrawal strength of 18 and 38 mm length of screw.
Effects of Various Factors on the Durability of Pellets Fabricated with Larix kaempferi C. and Liriodendron tulipifera L. sawdust
Lee, Soo-Min ; Choi, Don-Ha ; Cho, Seong-Taek ; Nam, Tae-Hyun ; Han, Gyu-Seong ; Yang, In ;
Journal of the Korean Wood Science and Technology, volume 39, issue 3, 2011, Pages 258~268
DOI : 10.5658/WOOD.2011.39.3.258
This study was conducted to investigate the effects of sawdust size and moisture content, pelletizing temperature and time on the durability of the pellets fabricated with larch and tulip tree sawdust. The durability of larch-pellet was significantly higher than that of tulip tree-pellet. For the larch-pellets, the durability of the pellets fabricated with > 18 mesh sawdust was higher than that of 8~18 mesh sawdust. With the increases of pelletizing temperature and time, the durabilities of larch- and tulip tree-pellets steadily improved. The durabilities of larch- and tulip tree-pellets also increased as the moisture content of sawdust increased. In the comparison of durabilities between commercial pellets and larch- or tulip tree-pellets, the pellets fabricated with larch and tulip tree sawdusts in our study were less denser than commercial pellets, but the durability of most larch-pellets was satisfied with the 1st-grade pellet standard designated by Korea Forest Research Institute. In addition, the durability of tulip tree-pellets were higher than that of the 3rd-grade pellet standard. From the scanning electron microscopic observation of larchand tulip tree-pellets, the gap between the sawdusts of each pellet was reduced with the increases of pelletizing temperature and time. In particular, it was visually confirmed that the surface of the pellets made with the pelletizing temperature of
for 3 min did not differ from that of commercial pellets.
Suggestion of Thermal Environment Miniature for Evaluation of Heating Efficiency Based on Thermal Conductivity Measurement Method of Building Materials
Jeon, Ji-Soo ; Seo, Jung-Ki ; Kim, Su-Min ;
Journal of the Korean Wood Science and Technology, volume 39, issue 3, 2011, Pages 269~280
DOI : 10.5658/WOOD.2011.39.3.269
Today, global warming is one of main problems all over the world. The cause of the global warming is carbon dioxide outbreak by the rapidly increasing energy use. Therefore, it is necessary to save energy in each industrious field. It was investigated that the half of total energy consumption over the world was used for construction and building. Therefore, the saving of the building energy plays a significant role in decreasing total energy consumption. With the considerable increase in building energy consumption, a green building rating system and certification are required to reduce building energy consumption and
emissions. Of various elements reducing building energy, the thermal conductivity of materials affects the energy consumption as a basic element, which is directly related with reducing energy consumption. In particular, as the thermal conductivity of finishing materials is an important factor to decide heating energy efficiency of floor heating system, the investigation and development are necessary.