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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 40, Issue 6 - Nov 2012
Volume 40, Issue 5 - Sep 2012
Volume 40, Issue 4 - Jul 2012
Volume 40, Issue 3 - May 2012
Volume 40, Issue 2 - Mar 2012
Volume 40, Issue 1 - Jan 2012
Selecting the target year
Effect of the Withdrawal Strength of Wood Screws in Domestic Wood by Shear Strength with Different Growth Ring Orientation
Cha, Jae Kyung ;
Journal of the Korean Wood Science and Technology, volume 40, issue 6, 2012, Pages 363~369
DOI : 10.5658/WOOD.2012.40.6.363
Shear tests parallel to the grain were conducted on domestic wood samples with different growth ring orientations. Shear strength was dependent on the angles between the direction of growth ring orientation and the applied force. The maximum shear strength showed at the intermediate growth ring orientations. Results of shear tests were also used to modify the formula which had previously been developed to predict the withdrawal strength of screw on the face of lumber. Predicted equations were fitted to the results of previous study with different length of No. 8 screw. Predicted equation was under-predicted the withdrawal strength of 25 and 30 mm length of screw within 8% and over-predicted withdrawal strength of 18 and 38 mm length of screw. A little differences between the predicted by shear strength with different growth ring orientation and observed values was existed.
Effect of Heat Treatment Conditions on Color Change and Termite Resistance of Heat-Treated Wood
Ra, Jong-Bum ; Kim, Ki-Bum ; Leem, Kyung-Hun ;
Journal of the Korean Wood Science and Technology, volume 40, issue 6, 2012, Pages 370~377
DOI : 10.5658/WOOD.2012.40.6.370
This study was conducted to investigate the color change of heat-treated wood made of Korean pine (Pinus koraiensis S. et Z.), and lodgepole pine (Pinus contorta Dougl). The wood samples were heat-treated at 9 different treatment combinations of temperature (170, 180, 200, 220, and
), and time (90, 120, 180, 240, 270 min.) set up by a response surface method. Wood color was measured using a colorimeter, and the samples were installed for evaluating the resistance of termite in the field test sites set up in Jinju. The lightness decreased with the increase of treatment temperature and treatment time. The color differences were evaluated by the method of National Bureau of Standards (NBS), and response surface models to predict the color change were fitted as a function of treatment temperature and treatment time. The
values of the fitted models of heat-treated Korean pine and lodgepole pines were 0.92, and 0.88, respectively, showing the potential way for the prediction of color changes. Severe damage was found from the samples in the field test site, which means that the manufactured heat-treated wood did not show the termite resistance enough for the outdoor use.
Factors Affecting Sap Exudation of Juglans Mandshurica and Acer Mono : (III) Inje Region in Korea
Choi, Won-Sil ; Choi, In-Gyu ; Park, Mi-Jin ;
Journal of the Korean Wood Science and Technology, volume 40, issue 6, 2012, Pages 378~388
DOI : 10.5658/WOOD.2012.40.6.378
This study was carried out to investigate the optimum condition for sap exudation of Juglans mandshurica in comparison with Acer mono Max. trees in a site of Inje-Gun, Gangwon-Do, Korea. Amount of sap exudation, air temperature, relative air humidity and tree diameter at breast height (DBH) were monitored for the period of February 1 through March 31, 2008, and correlation analysis of several factors affecting on sap exudation was carried out. Sap exudation from J. mandshurica initiated on Feb. 28 as the same time in case of A. mono and continued for a month, and enhanced in early March compared to around the middle of March for A. mono. The amount of sap of A. mono was linearly proportional to the diameter at breast height (DBH) but there was no apparent relationship for J. mandshurica. As the amount of sap exudation per tree increased then sap exudation per unit DBH was also linearly proportional in both J. mandshurica and A. mono. The amount of sap exudation per unit DBH of J. manshurica were
on average, which was one third times of
for A. mono. During the days of enhanced sap exudation, the atmospheric conditions such as air temperature and relative humidity around J. manshurica trees were very similar with those of A. mono. The minimum temperature was a significant factor affecting the amount of sap of J. mandshurica whereas the range of temperature was the principal factor for A. mono. In conclusion, the sap of J. mandshurica exudated in atmospheric conditions similar to A. mono, but the amount of sap was affected by different atmospheric factors compared to A. mono.
Kinetic Study on the Acid-catalyzed Hydrolysis of Xylan
Seo, Young-Jun ; Lee, Hong-Joo ; Lee, Jae-Won ;
Journal of the Korean Wood Science and Technology, volume 40, issue 6, 2012, Pages 389~396
DOI : 10.5658/WOOD.2012.40.6.389
In this study, we investigated the kinetics of acid-catalyzed hydrolysis of xylan over a 60 min at
. Sulfuric, oxalic and maleic acids were used as acid catalyst for hydrolysis. The calculated degradation rate constants (
) showed a correlation with the acid concentration, meaning that the stronger the acid, the higher the xylan degradation rate. Among sulfuric, oxalic and maleic acid catalyzed hydrolysis, the xylan degradation rate to xylose was highest with sulfuric acid. At equivalent solution pH, acid catalyzed hydrolysis was proportional to
of dicarboxylic acid such as oxalic and maleic acid was higher than that of sulfuric acid at same pH values during hydrolysis.
Evaluation of friction force varied by non-slip surface patterns of deck
Han, Yeonjung ; Lee, Ju-Hee ; Park, Yonggun ; Choi, Yun-Ho ; Yeo, Hwanmyeong ;
Journal of the Korean Wood Science and Technology, volume 40, issue 6, 2012, Pages 397~405
DOI : 10.5658/WOOD.2012.40.6.397
Installation of deck has been on the rise in Korea recently, but there is little of research on the safety of deck. One of the major factors affecting maneuverability of a pedestrian is frictional force between an outsole of shoe and a surface of the deck. The frictional force is influenced by many factors such as raw material variance of deck, surface convex shape of deck, outsole patterns of shoes, and moist condition of contact surface between deck and shoes. This study focused on evaluating the effect of these factors on the frictional force. Two kinds of deck, which were made of natural wood and wood plastic composite, were used in this study. The surface convex patterns of deck were classified to single nonslip (longitudinal groove processing) and double nonslip (longitudinal and transverse groove processing). Two kinds of shoe outsole patterns, W-shape and rectangle-shape, were used in the tests. Also, the friction tests were carried out at dried surface conditions and water-adsorbed surface condition.
Physical Properties of Hybrid Boards Composed of Green Tea, Charcoals and Wood Fiber
Park, Han-Min ; Heo, Hwang-Sun ; Sung, Eun-Jong ; Nam, Kyeong-Han ; Lim, Jae-Seop ;
Journal of the Korean Wood Science and Technology, volume 40, issue 6, 2012, Pages 406~417
DOI : 10.5658/WOOD.2012.40.6.406
In this study, eco-friendly hybrid composite boards were manufactured from green tea, three kinds of charcoals and wood fiber for developing interior materials to reinforce the functionalities such as the deodorization and the absorbability on the green tea-wood fiber hybrid boards in the previous researches. The effects of kind of raw materials and the component ratio of raw materials on dimensional stability, deodorization and emission of formaldehyde were investigated. Thickness swelling of the hybrid composite boards increased with increasing of component ratio of green tea and charcoals, but the values were markedly lower than that of Korean standard (KS) for commercial medium density fiber board (MDF), except for hybrid composite boards composed of greed tea, activated charcoal and wood fiber. Reduction rate of ammonia gas for the hybrid composite boards composed of green tea, activated charcoal and wood fiber showed a high value of 96% after 30 minute from the beginning of the test, and the other hybrid boards also showed a high value of about 95% after one hour. Emission amount of formaldehyde was similar to that of
grade in case of using
grade urea resin, and was similar to that of super
grade in case of using
grade urea resin.
Bonding Quality of Cylindrical LVL and Surface Durability by Its Painting
Suh, Jin-Suk ; Kim, Jong-In ; Hwang, Sung-Wook ; Park, Sang-Bum ;
Journal of the Korean Wood Science and Technology, volume 40, issue 6, 2012, Pages 418~423
DOI : 10.5658/WOOD.2012.40.6.418
In order to develop the end use of cylindrical laminated veneer lumber (LVL) such as wooden crafts, the water proof-bonding strength, the resistance to abrasion and the surface hardness by painting the surface of LVL were investigated. The study results were as follows; The water proof-bonding strength through 5 cyclic test by boiling in water immersion and drying were favorable without delamination of glue line. Then the formulation of glue was resorcinol resin (100) to hardener of paraformaldehyde (5) by mixed weight percentage. The resistance to abrasion was relatively higher at cross section than tangential section. When tangential section of LVL was painted by UV protection oil, the resistance to abrasion was improved. In case of an cross section of LVL, the higher surface hardness appeared at larch core than radiata pine LVL. Also, in case of an tangential section of LVL, the higher surface hardness appeared at glue line than veneer side.
Changes in Activities of Lignin Degrading Enzymes and Lignin Content During Degradation of Wood Chips by Polyporus brumalis
Cho, Myung-Kil ; Ryu, Sun-Hwa ; Kim, Myungkil ;
Journal of the Korean Wood Science and Technology, volume 40, issue 6, 2012, Pages 424~430
DOI : 10.5658/WOOD.2012.40.6.424
In this study, laccase activity, rate of weight loss and degree of lignin degradation of pine wood chips were determined during the liquid and solid state incubation with Polyporus brumalis. The results showed that laccase enzyme activity at untreated wood chip was gradually decreased after 20 days, but enzyme activity with wood chip treatment showed 10 times higher than untreated ones at 60 incubation days. Rate of weight losses of pine chip and rate of lignin loss were 23.4% and 6.3% by P. brumalis during 80 incubation days. Gene expression of pblac1 from P. brumalis was 3 times increased under pine chip treatment at 40 incubation days. Consequently, laccase activity of white rot fungi, P. brumalis, was increased at incubation with wood chip and pblac1 gene was important factor of lignin degradation. Therefore, to regulate lignin degrading enzyme gene expression by using the tools of biotechnology will be able to develop superior strains and it will be useful for pretreatment of lignocellulosic biomass at bioethanol production.
Evaluation on Effect of Constitution of Timber Framed Floor on Insulation Performance Against Impact Sound by Field Measurements
Park, Joo-Saeng ; Lee, Sang-Joon ; Kim, Se-Jong ;
Journal of the Korean Wood Science and Technology, volume 40, issue 6, 2012, Pages 431~444
DOI : 10.5658/WOOD.2012.40.6.431
Constituents of timber framed floor affect the insulation performance against impact sound significantly. Among them, installation of massive sound absorbing layer and reinforcement of stiffness of timber floor have been considered as major factors that improve the insulation performance against impact sound. Researches on evaluating the effect of floor constitutions have been carried out through the field measurements for timber framed buildings in Korea. It is concluded that the impact sound pressure level at the relatively lower frequency governs the overall insulation performance, and can be improved by the installation of sound absorbing layer and reinforcement of floor stiffness. Especially, the insulation performance against heavy impact sound was improved significantly when the massive cement mortar layer for floor heating system was installed and the stiffness was reinforced by shortening the joist span using additional beam at the mid-position of original span.
Effect of Particle Size and Moisture Content of Woody Biomass on the Feature of Pyrolytic Products
Hwang, Hyewon ; Oh, Shinyoung ; Kim, Jae-Young ; Lee, Soomin ; Cho, Taesu ; Choi, Joon Weon ;
Journal of the Korean Wood Science and Technology, volume 40, issue 6, 2012, Pages 445~453
DOI : 10.5658/WOOD.2012.40.6.445
In this study the effects of particle size and water content on the yields and physical/chemical properties of pyrolytic products were investigated through fast-pyrolysis of yellow poplar. Water content was critical parameters influencing the properties of bio-oil. The yields of bio-oil were increased with decreasing water content. However, the yield of pyrolytic product was not clearly influenced by feedstock's particle size. The water content, pH and HHV (Higher Heating Value) of bio-oil were measured to 20~30%, 2.2~2.4 and 16.6~18.5MJ/kg, respectively. The water content of feedstock was clearly influenced to water content of bio-oil. In terms of bio-char, HHV of them were measured to 26.2~30.1 MJ/kg with high content of carbon over 80%.