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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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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 31, Issue 6 - 00 2003
Volume 31, Issue 5 - 00 2003
Volume 31, Issue 4 - 00 2003
Volume 31, Issue 3 - 00 2003
Volume 31, Issue 2 - 00 2003
Volume 31, Issue 1 - 00 2003
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Combustion and Mechanical Properties of Fire Retardant Treated Waste Paper-Waste Acrylic Raw Fiber Composite Board
Eom, Young-Geun ; Yang, Han-Seung ; Kim, Hyun-Joong ;
Journal of the Korean Wood Science and Technology, volume 31, issue 3, 2003, Pages 1~10
Shredded waste newspapers, waste acrylic raw fibers, and urea-formaldehyde (UF) adhesives, at 10% by weight on raw material, were used to produce recycled waste paper-waste acrylic raw fiber composite boards in laboratory scale experiments. The physical and mechanical properties of fire retardant treated recycled waste paper-waste acrylic raw fiber composite boards were examined to investigate the possibility of using the composites as internal finishing materials with specific gravities of 0.8 and 1.0, containing 5, 10, 20, and 30(wt.%) of waste acrylic raw fiber and 10, 15, 20, and 25(wt.%) of fire retardant (inorganic chemical, FR-
) using the fabricating method used by commercial fiberboard manufacturers. The bending modulus of rupture increased as board density increased, decreased as waste acrylic raw fiber content increased, and also decreased as the fire retardant content increased. Mechanical properties were a little inferior to medium density fiberboard (MDF) or hardboard (HB), but significantly superior to gypsum board (GB) and insulation board (IB). The incombustibility of the fire retardant treated composite board increased on increasing the fire retardant content. The study shows that there is a possibility that composites made of recycled waste paper and waste acrylic raw fiber can be use as fire retardant internal finishing materials.
Characteristics of Wood Meals by Laccase Delignification
Kim, Myung-Kil ;
Journal of the Korean Wood Science and Technology, volume 31, issue 3, 2003, Pages 11~16
On nitrobenzene oxidation of aspen, spruce, and knauf wood meals gave rise to vanilline, syrigaldehyde, p-hydroxybenzoaldehyde, vanillic acid, and other minor oxidation products. The phenolic aldehydes (p-hydroxybenzaldehyde, vanilline, and syringaldehyde) are derived from oxidative degradation of the corresponding 4-hydroxyphenylpropane units and their ethers. The lignin content of knauf wood meals was different as the concentration of NaOH solution and cooking temperature. The lignin contents of aspen, spruce, and knauf wood meals were decreased as laccase treatment. The laccase caused C-oxidation, demethylation, cleavage in phenolic groups and C-C cleavage in syrigyl structures.
Physical and Mechanical Properties of Sawdust Board Made of Thinning Logs (II)- The Effect of Density and Additive Quantity of Powder Phenolic Resin -
Oh, Seung-Won ;
Journal of the Korean Wood Science and Technology, volume 31, issue 3, 2003, Pages 17~23
As a fundamental study of developing sawdust board from thinning softwood logs from three species (Pinus densiflora S. et Z., Larix leptolepis G. and Pinus koraiensis S. et Z.), this study examined the effect of board density and resin content on physical and mechanical properties of sawdust board. As the board density increase, thickness swelling, bending strength, and Brinell hardness increased while water absorption decreased. With increasing the resin content, the bending strength and hardness increased while water absorption and thickness swelling decreased. The board made of L. leptolepis was slightly low in its water absorption, and the one made of P. koraiensis was a little high in its bending strength, while there was no definite difference between each kind of trees in their hardness values.
Determination of Diffusion Coefficients of Boron from Borate Rods in Wood Using Boltzmann's Transformation
Ra, Jong-Bum ;
Journal of the Korean Wood Science and Technology, volume 31, issue 3, 2003, Pages 24~29
This research was performed to investigate the diffusivity of borate rods in radiata pine (Pinus radiata D. Don) conditioned to 40 percent moisture content (MC). The deepest penetration of boron were observed in the longitudinal direction, followed by the radial and the tangential directions. The boron loading on the wood face adjacent to the borate rod tended to increase with diffusion time in all directions. To mathematically quantify boron diffusion, the diffusion coefficient of boron was determined using Boltzmann’s transformation by assuming that it was a function of concentration only. The values of the longitudinal diffusion coefficients were between
/sec. The radial diffusion coefficients were between
/sec, and the tangential diffusion coefficients were between
/sec. The differences of diffusion coefficients between the longitudinal direction and the radial direction were slight, although their concentration profiles were markedly different. This indicates that the amount of boron loading on the wood face adjacent the borate rod is one of the most important factor for boron penetration in wood with low MC.
Flavonol Glycosides from the Wood of Platycarya strobilacea
Lee, Hak-Ju ; Park, Young-Ki ; Kwon, Yeong-Han ; Lee, Sung-Suk ; Choi, Don-Ha ;
Journal of the Korean Wood Science and Technology, volume 31, issue 3, 2003, Pages 30~34
This study was carried out to investigate the constituents of Platycarya strobilacea (Juglandaceae) wood. To isolate compounds, wood was extracted with ethanol (EtOH) and then partitioned with petroleum ether, diethyl ether (
) and ethyl acetate (EtOAc) successively. After partitioned, diethyl ether fraction was subjected to column chromatography with various solvent system in silica gel and/or Sephadex LH-20. Structures were elucidated by spectroscopic methods including MS,
and 2D-NMR experiments. Three compounds were isolated from the wood and identified as kaempferol 3-O-
-L-rhamnopyranoside (afzelin, I), quercetin 3-O-
-L-rhamnopyranoside (quercitrin, II), myricetin 3-O-
-L-rhamnopyranoside (myricitrin, III).
Tensile Strength of Clear Thin Wood Samples in Relation to the Slope of Grain
Cha, Jae-Kyung ;
Journal of the Korean Wood Science and Technology, volume 31, issue 3, 2003, Pages 35~41
The mechanical and physical properties of wood are strongly dependent upon the slope of grain. Specially, tensile strength is more severely affected by the slope of grain. Therefore, tension tests were performed on small thin wood samples made from Pinus radiata with varying the slope of grain. Determining the tensile strength for clear thin wood samples the other variabilities associated with material, size, drying, defects, etc were discarded. Slope of grain was measured by the slope of grain indicator and actual slope of grain was also determined by a protractor. Correlation coefficients between machine measured and actual slope of grain for 40 pieces of 2
20 mm, 300 mm long Pinus radiata were 0.84 for wide face measurement. Results also showed that tensile strength and MOE from stress wave tests decreased with increasing the slope of grain. This study did not establish a relationships for tensile strength and MOE from stress wave with slope of grain. However, the trends of MOEs from stress wave test with both slope of grain are agreed well with Hankinson's equation. Predicted tension strength curve by Hankinson’s equation was also agreed well with the experimental data over the range from 0 to 13 degrees for slope of grain.
Mechanical Properties of Rice Husk Flour-Wood Particleboard by Urea-Formaldehyde Resin
Lee, Young-Kyu ; Kim, Su-Min ; Yang, Han-Seung ; Kim, Hyun-Joong ;
Journal of the Korean Wood Science and Technology, volume 31, issue 3, 2003, Pages 42~49
The objective of this research was to investigate the possibility of using rice husk flour as a partial substitute for the wood particles used as the raw material for manufacturing particleboards, by examining the physical and mechanical properties of the rice husk flour-wood particleboard as a function of the type of urea-formaldehyde resin used. Commercial wood particles and two types of rice husk flours (A type (30
), B type (300
)) were used.
class urea-formaldehyde resin was used as the composite binder, combined with 10 wt.%
solution as a hardener. Rice husk flour-wood particleboards with dimensions of 27
0.7 (cm) were manufactured at a specific gravity of 0.7 with rice husk flour contents of 0, 5, 10, and 15 (wt.%). We examined the physical properties (specific gravity and moisture content), mechanical properties (three point bending strength and internal bonding) of the composite. In general, it can be concluded that composites made from rice husk flours are of somewhat poorer quality than those made from wood; however, blending in small amounts of rice husk flour (e.g., 5% to 10% by weight) may have no significant impact on quality.
Study on the Development Direction of the Use of Wood as a Landscape Material
Bae, Hyun-Mi ; Lee, Weon-Hee ;
Journal of the Korean Wood Science and Technology, volume 31, issue 3, 2003, Pages 50~60
The main purpose of this study was to propose the development direction and application method of wood as a landscape material by analysis and investigation of the present condition and characteristics of wood, which is a quite interesting natural material for its beauty as an exterior material. This study is based on the relationships between the establishment of development direction and practical use of exterior wood as a landscape material. The research method used was fieldwork and data analysis. On the analysis of the present condition of wood utilization, it was investigated to need of complement of a design aspect, use method, the limit of use type, and use range. The direction of a durable design for the practical use of exterior wood as landscape materials was established. On the use of exterior wood, first, the characteristics of wood have to be understood. Then exterior wood can be used while preserving its safety and beauty over a long time by physical and chemical treatment. At the same time, an application plan for the practical and effective use of wood as an outdoor landscape material, we concluded that future research in design aspects is needed in consideration of physical, chemical, and structural properties of durable wood materials used in outdoor facilities.
Evaluation of Dowel Bearing Strength of Structural Com-posite Lumber(SCL) on the Effect of Moisture Content
Oh, Sei-Chang ;
Journal of the Korean Wood Science and Technology, volume 31, issue 3, 2003, Pages 61~69
This study investigated the effect of moisture content and loading direction on dowel bearing strength of two types of SCL. Dowel bearing tests of LVL and PSL were conducted with two different MC level, 7.5% and 19%, and two different oriention, L-direction(loading parallel to grain) and X-direction(loading perpendicular to grain). Most of specimens showed typical load-deformation curves and intersected 5% offset line. Failure modes were classified into two categories; spliting(for L-direction specimens) and peeling(for X-direction specimens). Dowel bearing strength generally decreased with increasing MC. The decreasing rate was more significant in X-directon. ESG also decreased with increasing MC, and the ratio of ESG of 7.5% versus 19% was about 1.47. Dowel bearing strength of LVL and PSL in L-direction was higher than that of X-direction. This results indicated that MC and loading orientation had a significant effect on dowel bearing strength of SCL. The average dowel bearing strength of LVL were higher than that of PSL in each loading direction. Two types of probability distribution model were chosen to quantify strength distribution, normal and 2-parameter weibull distribution. The two models showed good agreement with the data, especially in lower tail of the cumulative distribution. Normal and 2-parameter weibull distribution seemed to proper model of the dowel bearing strength for each MC levels.
Studies on Biological Activity of Wood Extractives(X IV) - Antifungal activity of isoflavonoids -
Park, Young-Ki ; Lee, Sung-Suk ; Lee, Hak-Ju ; Choi, Don-Ha ;
Journal of the Korean Wood Science and Technology, volume 31, issue 3, 2003, Pages 70~76
Five isoflavonoids, biochanin A-7-O-
-D-gluco- pyranoside (1), (-)-maackiain (2), calycosin (3), trifolirhizin (4) and genistein (5), were tested for antifungal activity against nine fungi. These compounds were isolated from the wood (compound 1 and 2) and from the bark (compound 3, 4 and 5) of S. japonica. According to the results of antifungal activity test, (-)-maackiain was evaluated as the best antifungal compound among the isolated compounds. In this regard, it could be mentioned that high antifungal activity of S. japonica wood extracts was originated from (-)-maackiain.