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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 23, Issue 4 - Dec 1995
Volume 23, Issue 3 - Sep 1995
Volume 23, Issue 2 - Jun 1995
Volume 23, Issue 1 - Mar 1995
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New Trends in the Chemistry of Cellulose and Lignocellulosic Materials (Wood)
Lim, Kie-Pyo ;
Journal of the Korean Wood Science and Technology, volume 23, issue 2, 1995, Pages 1~11
Load-Displacement Characteristics and Interactive Load Capacity Model for Metal Plate Connections in Wood(II) - Interactive Load Capacity Model and Experimental Verification -
Park, Moon-Jae ; Jung, Hee-Suk ;
Journal of the Korean Wood Science and Technology, volume 23, issue 2, 1995, Pages 12~18
Liquefaction of Wood (II) - Analysis of Liquefied Wood Components -
Doh, Geum-Hyun ; Kong, Yong-To ;
Journal of the Korean Wood Science and Technology, volume 23, issue 2, 1995, Pages 19~25
This research was carried out to investigate the methods of liquefaction with Pinus koraiensis, and chemical components of the liquefied wood by FT-IR analysis and pyrolysis-GC/MS. Acetylated wood powder was liquefied above 90% in phenol or m-cresol when treated at about 150
for 30min., using some catalysts. Untreated wood powder was liquefied above 90% in phenol or m-cresol when treated at about 200
for 60min., using some catalysts. The results of FTIR analysis, carbohydrates were terribly disintegrated, the other side lignin peaks were occurred in liquefied wood, particulary. The results of pyrolysis-GC/MS, the liquefied wood have clear four peaks, phenol, guaiacol, o-cresol and m-/p-cresol, due to degradation of lignin, particulary.
Total Utilization of Woody Biomass by Steam Explosion (III) - The Preparation of Acetate from Pine and Oak Exploded Wood -
Lee, Jong-Yoon ; Chang, Jun-Pok ; Yang, Jae-Kyung ;
Journal of the Korean Wood Science and Technology, volume 23, issue 2, 1995, Pages 26~31
Acetylcellulose(AC) was prepared with steam exploded wood(EXW) and EXW after delignification with sodium chlorite, pine (Pinus densiflora) and oak (Quercus mongolica) woods. The color of acetylated pine and oak exploded wood was brown, degree of substitution(D.S) of pine was 1.47~2.09, and this of oak was 1.49~2.29. The hemicellulose content of acetylated pine and oak exploded wood was 0~3.4% and 1.49~11.3%, individually. The degree of substitution of acetylated wood prepared from delignified EXW in the pine and oak wood was 0.50~0.71 and 0.70~0.88, individually. Hemicellulose content of acetylated EXW with sodium chlorite after delignification in the pine and oak wood was less than 1% and 0.6~2.5%. The color of acetylated wood after delignification was white. IR-spectra of acetylated pine and oak EXW after delignification were found that peaks at around 1740
increase markedly, due to ester carbonyl group.
Dynamic MOE and Internal Friction of Compression Woods in Pinus densiflora
Hong, Byung-Wha ; Byeon, Hee-Seop ;
Journal of the Korean Wood Science and Technology, volume 23, issue 2, 1995, Pages 32~36
A study was conducted to evaluate the dynamic mechanical properties (modulus of elasticity, resonant frequency and interanal friction) of compression wood in Pinus densiflora. Vibration method was used for estimation of dynamic modulus of elasticity and the values were compared to those of static bending modulus of elasticity. The results obtained are as follows: 1. The dynamic modulus of elasticity of compression wood decreased, whereas that of normal wood increased, with increasing specific gravity. 2. The resonant frequency of compression wood decreased, whereas that of normal wood increased, with increasing specific gravity. 3. The internal friction of compression wood increased with increasing specific gravity. 4. The correlation coefficients between dynamic and static moduli of elasticity in compression and normal woods were high.
A Study on Chemical Modification of Papermaking Fibers (I) - Improved Physical Characteristics from Partial Carboxymethylated Pulps -
Choi, Jeong-Heon ; Jo, Byoung-Muk ; Oh, Jung-Soo ;
Journal of the Korean Wood Science and Technology, volume 23, issue 2, 1995, Pages 37~46
The substitution of carboxymethylated hydroxyl group in pulp revealed more hydrophilic than hydroxyl group. And then fibers were more flexible, swell more which leads to better conformation between fibers in turn this raise paper strength. In this paper, we tried to chemical modifyings of recycled fiber, OCCs(old corrugated containers). Many researchers have examined chemical modification of papermaking fiber by partial carboxymethylation(PCM) using a organic solvent processes. We made modified PCM processes adapted waters m replace of the organic solvent. Our testings for the optimum conditions on the new method, conditions as reaction time, temperature, liquor ratios were designed likely plant system. Freenesses(SR
) were increased following on carboxyl content of the samples. Handsheets of untreated samples and partial carboxymethylated OCCs were made by optimum conditions on different concentrations of the reagent. As results, maximum 25% strength increasing effects were obtained by the new method.
Study on Mensurability of Internal Defect Prediction and of Classification of Log by NDE(Non-Destructive Evaluation) (I) - Focused on Cross Direction of Log -
Park, Heon ; Gang, Eun-Chang ; Chun, Sung-Jin ; Yoon, Kyung-Seob ;
Journal of the Korean Wood Science and Technology, volume 23, issue 2, 1995, Pages 47~54
This study was to measure the properties of logs and classify them by non-destructive methods. The purpose of this experiment was focused at mensurability of logs by non-destructive methods. The non-destructive instrument, Stress-Wave Timer 239A which was made by Metriguard in U.S.A., was used. The stress wave velocities of log's cross direction were measured and compared with three different methods; 1. with hammer, 2. with hammer and D.B.H. meter, 3. with manufactured instrument. Number of used logs were seven logs, which were classified by naked eye into six groups; very severe rot, severe rot, mild rot & knot, mild rot & check, mild rot, sound log, and in diameter were into three groups; large(57.4cm), medium(36~41.2cm), small(28.9cm) log. The results, which were classified by mensurability with non-destructive methods, were followed; 1. The stress wave velocities were very different between rot and sound log. So it meant the possibility of mensurability of logs by non-destructive method even if high standard error. 2. The stress wave velocities decreased with checks more than with rots, which meant the checks affected speeds more. 3. The stress wave velocities increased with knot. 4. The velocities with manufactured instrument showed lower standard error, so more accurate results than other methods. Especially the required labour decreased from 3~4 to 2 persons. 5. Finally, the mensurability showed more accurate results and made the classification of logs scientific.
Studies on Manufacture of Thin Composite Panel for Substitute Use of Plywood (I) - On the Optimum Manufacturing Condition of Composites -
Lee, Phil-Woo ;
Journal of the Korean Wood Science and Technology, volume 23, issue 2, 1995, Pages 55~69
The primary objective of this research was to investigate optimum manufacturing condition of thin composite panels composed of sawdust, polyethylene film and polypropylene net. At the study the experiment was designed to make thin board in which sawdust offers effectiveness as core composing material, polyethylene as adhesive with added urea resin, and polypropylene as stiffness and flexibility in the composition panel. 100 types of thin composite panels were manufactured according to press-lam and mat-forming process of various hot pressing conditions(pressure, temperature and time). They were tested and compared with control boards on bending properties(MOR, MOE, SPL, WML), internal bond strength, thickness swelling, linear expansion and water absorption. At the same time the visual inspections of each types of panels were accomplished. The physical and mechanical properties of composite types passed by visual inspection were analyzed by Tukey's studentized range test. From the statistical analysis, the optimum manufacturing condition of thin composite panels were selected. Compared with two manufacturing processes, mat-forming process performed better than press-lam process in all tested properties. The optimum manufacturing conditions resulted from the experiment and statistical analysis were able to determine as following: the press temperature was shown the most good result at 130
in mat forming process and 140
press lam process, the press time 4 min in both processes, but the press pressure was 25-10kg/
in mat forming and 15k/
press lam process.
Effect of the Sequence of Wax Addition, Wax Level and Type on Properties of Isocyanate-Bonded Particleboard
Kwon, Jin-Heon ;
Journal of the Korean Wood Science and Technology, volume 23, issue 2, 1995, Pages 70~76
Research was conducted at the Wood Materials and Engineering Laboratory, Washington State University, Pullman, WA to evaluate the effects of the sequence of wax addition, wax level, and wax type on mechanical properties and water resistance performance of isocyanate-bonded particleboard. Mechanical properties and water resistance performance were not influenced significantly by the sequence of wax addition. Internal bond and wet modulus of rupture in bending strength were decreased significantly by increasing the wax emulsion level, but dry modulus of rupture and modulus of elasticity in bending strength were not decreased significantly by increasing the wax emulsion level. Dry internal bond, dry and wet moduli of rupture, and modulus of elasticity were not decreased by increasing the solid wax level except for wet internal bond. The addition of 1.0 and 1.5% wax level did not produce any significant additional water resistance effect when compared to the addition of 0.5% wax level. Internal bond values of boards with solid wax addition showed significantly better results than boards with just a wax emulsion added. Modulus of rupture, modulus of elasticity, and water resistance performance did not show significant difference between solid wax and wax emulsion.
Distribution and Preservative Effectiveness of Resin Element in Pine Wood Impregnated with Monoethylene Glycol Resin Solution
Lee, Jong-Shin ;
Journal of the Korean Wood Science and Technology, volume 23, issue 2, 1995, Pages 77~82
With the aim to utilize pine wood(Pinus densiflora Sieb. et Zucc.) as an interior building materials, such as flooring material, monoethylene glycol(MEG) resin solution was impregnated into greenwood. Specimens of three different qualities, that is, normal wood, resinous wood and compression wood, were prepared. Distribution of resin element(phosphorus) in MEG resin solution-impregnated woods and preservative effectiveness against brown rot fungi(Tyromyces palustris and Serpula lacrymans) of these woods were investigated. The results were as follows: 1. The concentration of phosphorus into cell walls of resinous wood and compression wood was lower compared to that of normal wood. This shows that the quality of wood has an influence on the penetration of MEG resin solution into the wood. It was shown from a leaching test that MEG resin could be leached out easily from the cell walls. 2. The resinous wood and compression wood, even without MEG resin solution impregnation had high decay resistance. For normal wood, significant improvement of preservative effectiveness was observed after impregnation of MEG resin solution. It was shown that MEG resin was leached out from the woods after leaching test, resulting in the reduction of preservative effectiveness. From this result, suitability of MEG resin solution-impregnated woods as an interior materials was recognized.
Impact-Response of Floor Construction Materials
Jang, Sang-Sik ;
Journal of the Korean Wood Science and Technology, volume 23, issue 2, 1995, Pages 83~87
Impact-bouncing height of steel balls dropped from 1m height on various floor materials were measured to evaluate impact-bouncing characteristics depending on floor materials and the effect of these properties on walkability and fatigue of humanbody. Stone and tile finished concrete floor showed the highest bouncing height of around 70%, and soil showed the lowest bouncing height of around 3%. The second highest bouncing height was about 40% which corresponded to terazo finished concrete floor and about twice as high as the bouncing height on concrete floor without finishing. The impact-bouncing height could be lowered to 15~20% by using gum tile on concrete floor. Steel showed similar bouncing height to concrete floor, and wood-based materials showed the second lowest bouncing height next to soil. Among wood-based materials, hardwood species having higher specific gravities showed relatively high bouncing height of 8~24%, softwood species having low specific gravities showed relatively lower bouncing height of 5~18%, and wood composites showed bouncing height of 8~18%. Among all the materials used in this study, wood-based floor materials corresponded to the bouncing height of 10~15% which is considered to be best for humanbody. Surface painting on wood-based materials increased the bouncing height, and the number of bouncing of steel balls after dropping from 1m height increased as the bouncing height increased.
Liquefaction of Wood and It's Application for Adhesives - Acid-Catalyzed Liquefaction of Wood with Phenol -
Han, Gyu-Seong ;
Journal of the Korean Wood Science and Technology, volume 23, issue 2, 1995, Pages 88~93
Acid-catalysts were used to accelerate the liquefaction of wood with phenol. Sulfuric acid was quite excellent as a acid-catalyst of liquefaction of wood. It's proper dose was 3% of oven-dried weight of wood to get the 10% of target degree of residue, when the reaction time was 2 hours. The liquefaction of wood catalyzed with sulfuric acid was easily carried out at low temperature of 140
, but the degrees of residue decreased gradually with the increase of reaction temperature. The behaviors of liquefaction of oak and radiata pine were nearly same.
Flavonoid Extractives of Populus albaglandulosa
Ham, Yeon-Ho ; Bae, Young-Soo ;
Journal of the Korean Wood Science and Technology, volume 23, issue 2, 1995, Pages 94~99