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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 21, Issue 4 - Dec 1993
Volume 21, Issue 3 - Sep 1993
Volume 21, Issue 2 - Jun 1993
Volume 21, Issue 1 - Mar 1993
Selecting the target year
The Situation and Prospect of Korea Plywood Industry
Park, Young-Ju ;
Journal of the Korean Wood Science and Technology, volume 21, issue 2, 1993, Pages 5~7
Study of the Accelerated Weathering of Sitka spruce under Acidic Conditions
Kim, Jae-Jin ; Kim, Gyu-Hyeok ;
Journal of the Korean Wood Science and Technology, volume 21, issue 2, 1993, Pages 9~14
Weathering of wood in a region of acid rain was performed by the test which thin veneers of Sitka spruce were exposed to outdoor weathering for a total of 18 weeks, with a daily soaking for 30 minutes in acidified water in the pH range 2~5.6. The weathering measured by weight loss and loss in maximum failure load in tension was accelerated by the increase in the acidity of acidified water and in the period of outdoor exposure. It was also shown that the weathering was accelerated even with low acidic conditions in the case of long exposure period, although the weathering was rapidly accelerated with high acidic conditions. When compared the degree of weight loss with that of loss in failure load by weathering, the latter was much greater. From the results of this research, it could be concluded that at pH 4.0 or below of precipitation, the acceleration of weathering of exterior wood would become serious problems, which would be caused deterioration in performance of exterior wood.
Studies on Criterion for Mixed Mode Fracture in Glulam
Lee, Jee-Yong ; Lee, Jun-Jae ;
Journal of the Korean Wood Science and Technology, volume 21, issue 2, 1993, Pages 15~22
This study was carried out to investigate the fracture criterion of glulam. The mixed mode fracture of glulam was investigated by means of single edge notched specimens with various crack inclination in the longitudinal-radial plane. While fracture of wood is not completely understood, the study on linear-elastic fracture mechanics is a rational and valuable tool for studying the strength behavior of glulam. The results are summarized as follows : 1. Glue line has no effect on fracture strength. 2. There is a definite interaction between fracture toughness
during the mixed mode fracture of glulam. Several criterions for mixed mode failure were compared. The criterion was expressed in the following form:
3. As crack inclination increases,
value decreases. The equations relating crack angle to
, respectively, were obtained as follows;
A Fundamental Study on the Expert System for the Operations Management in Wood Furniture Industry
Kim, Il-Sook ; Lee, Hyoung-Woo ;
Journal of the Korean Wood Science and Technology, volume 21, issue 2, 1993, Pages 23~30
As the demand of wood furniture becomes diverse and large-sized, artificial intelligence technique is required to design the expert system which can promote the efficiency of the operations management in wood furniture industry. This study was carried out to develop the expert scheduler, which was applied to the scheduling in chair-manufacturing process to evaluate its validity. The expert scheduler could show the results of scheduling must faster than Gantt chart method with ease. Maximum tardiness in the current chair-manufacturing process could be reduced from 29 seconds to 5 seconds by the addition of a spindle sander, a 12 spindle universal boring machine, and a moulding sander to sanding, boring, and moulding process, respectively.
Effect of Compatibilizers on Mechanical Properties of Wood-Plastic Composites Using Styrene Polymers as Matrix Polymers
Han, Gyu-Seong ;
Journal of the Korean Wood Science and Technology, volume 21, issue 2, 1993, Pages 31~37
Composites of styrene polymers with woody fibers were prepared, and the effect of compatibilizers on their mechanical properties was evaluated. To improve the compatibility of wood fibers and the matrix polymers, styrene-maleic anhydride copolymer(SMA) and maleic anhydride-modified polymers were used as compatibilizers. As results, maleic anhydride-modified polystyrene and SMA were proved to improve the tensile strength of the molded composites, and also were evaluated as good compatibilizers for the wood fiber polystyrene composite. Cellulosic fiber (dissolving pulp) provided better reinforcement than lignocellulosic fiber(thermomechanical pulp). On the contrary in the case of the composite of wood fiber and acrylonitrile-butadiene styrene copolymer(ABS), SMA and maleic anhydride-modified acrylonitrile-butadiene-styrene copolymer(MABS) did not act as compatibilizers. However, MABS was evaluated as a good polymer matrix to make wood fiber reinforced composite. The tensile properties of the composites of wood fiber and MABS were superior than those of wood fiber-ABS composites.
Improvement of the Value for Technical Wood Arts of Disks by End-Taping with Korean Traditional Paper During Vacuum Drying
Jung, Hee-Suk ; Lee, Nam-Ho ; Sim, Jae-Hyeon ; Yeo, Hwan-Myeong ;
Journal of the Korean Wood Science and Technology, volume 21, issue 2, 1993, Pages 39~48
End-matched disks of 7.7cm thickness were part-time dried in vacuum press dryer to investigate the drying characteristics by using drying schedules and end treatments. The ginkgo disks could be dried faster with severer end checks and ring failures by C schedule than by S schedule. There were no significant differences in drying rates and amounts of end checks, ring failures and V-shaped checks occurred between ginkgo disks end-taped with Korean traditional paper (KTP) and those untreated. The drying time of walnut disks was slightly reduced by end-taping with KTP. And the length of end checks and V-shaped checks and the frequency of defected disk were decreased more effectively than those untreated. The tangential strains and tangential drying stresses near bark sides of ginkgo and walnut disk untreated were developed in the early stage of drying and incresed slightly curvi-linearly above fiber saturation point (fsp) and more curvi-linearly below fsp. The influence of end-taping with KTP on the drying rate for impermeable walnut disk was stronger than that for permeable ginkgo disk.
Studies on the Manufacturing of Pollution-Free Korean Traditional Paper without Bleaching (I)
Cho, Nam-Seok ;
Journal of the Korean Wood Science and Technology, volume 21, issue 2, 1993, Pages 49~56
This study was performed to investigate the pollution-free Korean traditional papermaking characteristics from paper mulberry by sulfomethylation pulping. Bast fibers were pulped by sulfomethylated cooking liquor, and by alkali and alkali-peroxide processes for the comparison. Sulfomethylated pulping resulted in the superior pulp with high yield and better quality compared to those of alkali and alkali-peroxide pulps. Since the pulp was so bright, there was almost no need additional bleaching. Pollutant loads of sulfomethylated pulping effluent were very low in terms of pH, turbidity and color compared to those of alkali. Pollution-free effluents was accomplished by simple filtering treatment with pine bark, charred rice hull and sawdust compost. Pine bark was the most effective in reduction rate of pollutants.
Fundamental Study of Manufacture Possibility and Composition Ratio of Sludge-Particle Board
Lee, Phil-Woo ; Yoon, Hyoung-Un ; Kim, Dae-Jun ; Son, Jung-Il ;
Journal of the Korean Wood Science and Technology, volume 21, issue 2, 1993, Pages 57~65
The aim of this research was to manufacture sludge-particle board using paper sludge with wood particle and to investigate physical and mechanical properties of various sludge-particle boards, fabricated with ratios of sludge to particle of 10 to 90, 20 to 80, 30 to 70, 40 to 60 and 50 to 50(oven dry weight based). Sludge-particle boards were manufactured by urea-formaldehyde resin, 0.8 target specific gravity, and 10mm thickness. It was possible to manufacture sludge-particle board as the same processing in the present particleboard manufacturing system. This sludge-particle board have different properties as composition ratios of sludge and particle. And sludge-particle board made from 10 percent to 20 percent of sludge mixing ratio have similar mechanical properties compared with control particleboard. Especially, the sludge-particle board made from 10 percent to 40 percent mixing ratios of sludge have superior to control particleboard in internal bond, screw withdrawal holding strength and modulus of elasticity. In the case of dimensional stability, water absorption was increased and thickness swelling was decreased as increased with sludge mixing proportion. The sludge-particle board made of different mixing ratios of our laboratory design was able to concluded that there is possibility of partial substitution of wood particle materials.
Thin Layer Chromatography on the Influence of Hot Water Extractives of Domestic and Foreign Wood Species on the Cement Setting
Suh, Jin-Suk ;
Journal of the Korean Wood Science and Technology, volume 21, issue 2, 1993, Pages 67~72
Hot water extractives of sawdust/particle from domestic and foreign wood species, which were composed of pitch pine, Korean pine, larch, Italy poplar, acacia and oak as Korean wood species, Malaysian oil palm and German spruce were quantitatively analyzed with thin layer chromatography. Sugar components of saccharose, galactose, glucose, fructose and arabinose were contained in these wood species. It was assumed that arabinose and glucose are major inhibitory components against cement hardening in larch and oil palm, respectively, since both species contain a large amount of each sugar. In contrast, fructose might not influence so badly on a cement hardening, when considering that fructose was contained much in Italy poplar with a good cement hardening character. Galactose was a minor component.
Changes in Cellular Characteristics and Qualities of Matured and Juvenile Wood from Reforested Tree of Pinus koraiensis
Kang, Sun-Koo ;
Journal of the Korean Wood Science and Technology, volume 21, issue 2, 1993, Pages 73~80
Pinus koraiensis is one of the most important reforestation species which had widely been planted around the country. Therefore, there are great research needs on the fundamental properties of wood to extend the frequency of uses and adequate availabilities. Research results on the characteristics of anatomical wood properties and changes are summarized as follows: 1. At a horizontal direction of tree trunk, the tracheid length at outer wood gradually becomes shorter as it reaches to pith. The tracheid length having between 32 and 42 annual rings showed over 2.5 times longer than that of pith, and also its length increases from the bottom to the top of the stem. 2. The tracheid diameters in latewood showed a little fluctuations, and the shortest near to the pith in earlywood. The tracheid diameters in earlywood are more than 2 times those of latewood, and the differences between the mature and juvenile wood in earlywood are less than 10
. 3. The tracheid wall thickness in early wood showed a little fluctuations. On the contrary, tracheid wall thickness in latewood rapidly increases from the pith to the bark. The tracheid wall of mature wood showed 10 to 20% thicker than that of juvenile wood. 4. The fibril angle at the secondary walls of tracheid within an annual ring showed higher degree in earlywood than that of latewood. The highest tracheid fibril angle was observed at around the pith of both earlywood and latewood. Then, fibril angle slowly decreased toward outer wood, and was stabilized after 15 years. 5. Structural boundaries between mature and juvenile wood from Pinus koraiensis are divided by 13 to 19 annual ring and distance of 5 to 8cm from the pith.
Carbon-13 NMR Analysis of Organic Carbons from a Nothern Hardwood Litter and Leachates, Central Maine, U.S.A.
Choi, In-Gyu ;
Journal of the Korean Wood Science and Technology, volume 21, issue 2, 1993, Pages 81~90
Influences of Technology on International Strategic Allience Formation between U.S. Forest Products Suppliers and Korean Buyers
Vlosky, Richard ; Smith, Paul ;
Journal of the Korean Wood Science and Technology, volume 21, issue 2, 1993, Pages 91~95