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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 24, Issue 4 - Dec 1996
Volume 24, Issue 3 - Sep 1996
Volume 24, Issue 2 - Jun 1996
Volume 24, Issue 1 - Mar 1996
Selecting the target year
Development of New Products and High Value Added Biopolymer from Softwoods by Chemical Modification - Quantitative Variation of Water-soluble Extracts from Coniferous Barks for Tannin-based Adhesives -
Cho, Nam-Seok ; Han, Gyu-Seong ;
Journal of the Korean Wood Science and Technology, volume 24, issue 4, 1996, Pages 1~6
Extracts from bark have been studied with a view to producing water-proof wood adhesives. Lately many softwoods, such as radiata pine from New Zealand and larch from Siberia, Russia, have been imported and utilized, and their residual barks would be expecting as potential raw materials for something useful chemicals. The great effort toward utilization of bark extractives as a chemical feedstock has been made on a worldwide level. However few report has been done for the utilization of tree bark extractives in Korea. Hot-water extracts were prepared from barks of Japanese larch(Larix leptolepis). Siberian larch(Larix gmelinii) and Radiata pine(Pinus radiata). The effect of various factors, such as particle size, liquor ratio, extraction temperature, and reaction time, on the extractive yields was discussed. Particle sizes affected the hot-water extractives: the finer the particle size, the higher extractives and extract efficiency. Higher temperature and higher liquor ratio were more effective. Extractives from Japanese larch were relatively less than those from Siberian larch and Radiata pine barks. Formaldehyde precipitates was the highest in extractives of Radiata pine barks. It could be concluded that Siberian larch bark was the best raw material for tannin adhesives, because its extractive yield was higher than those of the other barks.
Study on Stress Waves for Development of Glulam from Domestic Small Diameter Log (II) - Static Bending Properties of Glulam Member -
Cha, Jae-Kyung ;
Journal of the Korean Wood Science and Technology, volume 24, issue 4, 1996, Pages 7~14
Studies on Wallpaper Making Using Hanji (I) - Making and Properties of Hanji for Wallpaper -
Yoon, Seung-Lak ; Jo, Hyun-Jin ; Park, Sang-Bum ; Kim, Hyo-Joo ; Kim, Jae-Kyeong ; Kim, Sa-Ick ;
Journal of the Korean Wood Science and Technology, volume 24, issue 4, 1996, Pages 15~21
This study was carried out to investigate the making method and properties of Hanji(Korean traditional paper) for wallpaper for the purpose of mass production and mass consumption of Hanji. Paper mulberry fiber was longer than wood fiber in length and it had also much extractives and ash in content. Bast fiber was a little damaged in the fibrilation and beating process because it was weak in flexibility and compressive properties. Proper conditions for making two-ply and three-ply Hanji were examined and six kinds of Hanji were made on the basis of the three-ply paper making method. The sample OH(Original Hanji) 2-2 and OH 3-2 among them obtained good results in quality test by appearance from wallpaper makers.
Air Permeability of Softwoods Imported from the Russian Far East
Jee, Woo-Kuen ; Kim, Gyu-Hyeok ;
Journal of the Korean Wood Science and Technology, volume 24, issue 4, 1996, Pages 22~31
Air permeabilities for both sapwood and heartwood of the three softwoods(Picea jezoensis, Larix gmelini, Pinus sylvestris), imported from the Russian Far East, in the three different structural directions were measured using steady-state rotameter method. After measuring permeability, the liquid absorption into the longitudinal permeability specimens was measured, and then related with the measured permeability. The longitudinal permeability was overwhelmingly greater than the transverse permeability, with the radial direction showing higher permeability than the tangential direction. There appear to be species differences in permeability of the three softwoods. The mean longitudinal sapwood permeability of P. jezoensis(3.300darcy) and P. sylvestris(3.028darcy) were considerably greater(ca. 25times) than that of L. gmelini(0.134darcy). Also the average longitudinal heartwood permeability of P. jezoensis(0.300darcy) was about 10 times as great as that of P. sylvestris(0.029darcy) and L. gmelini(0.024darcy). The average calculated radius of pit openings in the heartwood was
for L. gmelini,
for P. sylvestris for and
for P. jezoensis. Heartwood permeability increases with the increase in radius of pit pore and the decrease in ring width and in extractive content, even though the correlation between permeability and its affecting factors was dependent on species. However, there was an inverse relationship between specific gravity and permeability, showing poor correlation between them. The correlation between air permeability and liquid retention was fairly high, so it was revealed that prediction of liquid absorption into the wood by using permeability was feasible.
Dimensional Change of Melamine Sheet Laminated MDF Flooring by Heating
Min, Ill-Hong ; Kim, Eui-Sik ; Han, Gyu-Seong ;
Journal of the Korean Wood Science and Technology, volume 24, issue 4, 1996, Pages 32~39
The overall purpose of this study was to investigate the dimensional changes of melamine sheet laminated medium density fiberboard(MDF) floorings by sub-heating system(Ondol). This study was also conducted to improve the properties of melamine sheet laminated MDF floorings. The effects of density, resin content, manufacturing speed of MDF and types of melamine sheet on dimensional and weight changes of floorings were investigated. The results were as followings. 1. Dimensional and weight change of melamine sheet laminated MDF flooring by heating decreased with decreasing the density of MDF. 2. Dimensional and weight change of melamine sheet laminated MDF flooring by heating decreased with increasing the resin content of MDF. 3. Dimensional and weight change of melamine sheet laminated MDF flooring by heating decreased with decreasing the manufacturing speed of MDF. 4. Dimensional change of melamine sheet laminated MDF flooring in width direction by heating was doubled than that in machine direction. 5. Dimensional change and curling of high pressure melamine laminate(HPM) laminated MDF flooring by heating was less than those of low pressure melamine laminate(LPL) flooring. 6. Weight loss of melamine sheet laminated MDF flooring by heating has linear relationship with shrinkage.
Dimensional Change of Acetylated Softwood
Han, Gyu-Seong ; Cho, Nam-Seok ;
Journal of the Korean Wood Science and Technology, volume 24, issue 4, 1996, Pages 40~46
It is well-known fact that dimensional stability of wood is greatly enhanced by acetylation of wood. This dimensional stability results from bulking of the reacted acetate within the cell wall, which reduces further swelling when the modified woods corne into contact with water or water vapor. The purpose of this research was to determine the water absorption and dimensional stability of the acetylated solid wood in liquid water and in humidity tests. Radiata pine, Siberian larch, and Japanese larch were acetylated. Antiswelling efficiency(ASE) and equilibrium moisture content(EMC) of acetylated wood, at 95% RH and
after 4weeks, was quite dependent on WPG, but was not dependent on species.
Effects of UV Absorber and HALS(Hindered Amine Light Stabilizer) Addition in Water-soluble Acrylic Resin on Discoloration of Larix leptolepis (S. et Z.) Gordon
Kang, Kyoung-Taek ; Lee, Phil-Woo ;
Journal of the Korean Wood Science and Technology, volume 24, issue 4, 1996, Pages 47~55
UV transmission spectra of water-soluble acrylic resin films containing hydroxybenzophenolic, hydroxyphenylbenzotriazolic UV absorber and HALS(hindered amine light stabilizer) were investigated by exposure time(before exposure weathered for 160 and 320hours) in QUV Weather-Ometer. Also the YID(yellowness index difference), LID(lightness index difference) and CD(color difference) of dried water-soluble acrylic resin films and the coated woods of Larix leptolepis were analyzed by addition level of UV absorber(0, 1, 2 and 3%) and HALS(0, 0.5, 1 and 1.5%) and by exposure time in QUV Weather-Ometer. They showed no significant effects on UV transmission spectra of dried water-soluble acrylic resin films in the range of 300 to 400nm irrespective of exposure time. However, UV transmission decreased as increase of exposure time. UV transmission spectra were lower in dried water-soluble acrylic resin films containing hydroxybenzophenolic UV absorber and HALS than in these containing hydroxyphenylbenzotriazolic UV absorber and HALS in the range of 350 to 400nm. The least YID, LID and CD in the coated woods of Larix leptolepis appeared at the addition level of 3%, based on non-volatile content, in hydroxybenzophenolic and hydroxyphenylbenzotriazolic UV absorber, and of 1.5% in HALS to water-soluble acrylic resin.
Effects of Target Density and Strand Size on Properties of Oriented Strand Board Composed of Thinned Wood of Larix leptolepis Gordon
Park, Heon ; Kang, Eun-Chang ;
Journal of the Korean Wood Science and Technology, volume 24, issue 4, 1996, Pages 56~63
This study was to manufacture thinned wood of Larix leptolepis Gordon into Oriented Strand Board(OSB) with Urea-Formaldehyde Resin. The OSB was made of four kinds of strand in slenderness ratio 150 ; thickness
, respectively length 45mm, 60mm, 75mm and 90mm. Target densities were 0.65gr/
. The stepwise 9 minutes-multi-pressing schedule in the maximum pressure 40kgf/
, the minimum pressure 10kgf/
was applied for
board at the temperature of
in a hot press. In MOR The OSB of thin strand thickness
(length 45mm) and density 0.85gr/
was the highest. The strand thickness had more effect on MOR than the strand length. In strand thickness
(length 60mm) and density 0.85gr/
was the highest MOE. The strand thickness and length had adverse effects on MOE each other. At internal bonding. The OSB of strand thickness
(length 45mm) and board density 0.75gr/
showed the highest value. OSB had higher IB value with thinner strand thickness. The thinner strand thickness showed the lower thickness swelling in turn
(length 90mm). Target densities 0.75gr/
showed in turn lower value. Finally, The OSB made of thinned wood of Larix leptolepis Gordon showed good results in laboratory experiment.
The Energy Criteria for Elastic-Plastic Fracture in Tough Paper
Park, Jong-Moon ; Thorpe, James ;
Journal of the Korean Wood Science and Technology, volume 24, issue 4, 1996, Pages 64~73
Screening and Evaluating of Wood-Rotting Fungi for Lignin Degradation and Ligninolytic Enzyme Production (II) - Laccase Production by Lignin-Degrading Fungi -
Jung, Hyeun-Chae ; Park, Seur-Kee ; Kim, Byeong-Soo ; Park, Chong-Yawl ;
Journal of the Korean Wood Science and Technology, volume 24, issue 4, 1996, Pages 74~81
Effect of Properties of CMC on the Characteristics of Coating Color
Park, Chong-Yawl ; Kim, Byeong-Soo ; Jung, Hyeun-Chae ;
Journal of the Korean Wood Science and Technology, volume 24, issue 4, 1996, Pages 82~86
This study was performed to elucidate the effect of degree of substitution and degree of polymerization of CMC on the rheological characteristics of coating color which is consisted of calcium carbonate as pigment. The results were as follows: 1. It appeared that DP of CMC rather DS has an effect on the low shear viscosity of coating color. 2. According as shear rate increased, the effect of DP and DS on high shear viscosity of coating color decreased. 3. According to increasing DS and DP, the water retention of coating color increased.
Effects of Cutting Direction on the Laser Machining Characteristics of Wood
Lee, Hyoung-Woo ;
Journal of the Korean Wood Science and Technology, volume 24, issue 4, 1996, Pages 87~92
When cutting 2.0cm-thick red oak and hard maple with an air-jet-assisted carbon-dioxide laser of 2kW output power, maximum feed speed at the point of full penetration of the beam decreased with increasing the angle between grain and cutting direction. Feed speed averaged 3.75 and 3.38 meters per minute for red oak and hard maple, respectively. Gray-level of laser-cut surfaces were analyzed by image analysis system. The highest gray level of laser-cut surface was obtained when red oak was cut parallel to grain by laser. Surface profiler was used to scan the sawn and laser-cut surfaces. Center line average roughnesses of laser-cut surfaces were higher than those of sawn surfaces. Scanning electron micrographs showed the cell walls which were melted by laser.
Surface Electrochemical Study on the Fixation Properties of New Water-borne Preservatives in Red Pine
Kim, Yeong-Suk ;
Journal of the Korean Wood Science and Technology, volume 24, issue 4, 1996, Pages 93~99
In order to investigate the extent of fixation of new water-borne preservatives in blocks of pinus densiflora sapwoods the streaming potential through the column with preservative treated wood was measured at various conditions. The rates of leachability of ingredients in the treated wood were estimated by the measurement of electric conductivity of the solution with the leached components. The solution was also analyzed by Atomic absorption spectrophotometer (AA). As a results, the experimental data indicated that the fixation of CCB, CCFZ and ACQ in wood were relatively unstable. The fixation rates of CCB, CCFZ were improved by increasing heat and drying time. The amounts of the leached ingredients were apparently higher in CCB and CCFZ than in CCA, while the rate of leaching of ACQ was not changed at various drying temperature.