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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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Anatomical and Physical Characteristics of Pinus Densiflora Wood Damaged by Forest Fire
Hwang, Won-Joong ; Kwon, Goo-Joong ; Kim, Nam-Hun ;
Journal of the Korean Wood Science and Technology, volume 31, issue 4, 2003, Pages 1~7
Anatomical and physical characteristics of damaged wood by forest fire and sound wood of Pinus densiflora were examined. Granular substances were found in resin canals, epithelial cells and ray parenchyma cells of damaged wood, but the other distinctive marks of wood structure in damaged wood were not observed. Damaged wood showed slightly higher relative crystallinity in outermost growth ring than sound wood. Green moisture content and water absorptions both in tangential and radial sections of damaged wood were lower than those of sound wood. There were no significant differences in shrinkage, swelling and basic density between damaged and sound woods.
A Study on the Dimensional Stabilization of Domestic Small-Diameter Logs by Polyethylene Glycol Treatment - Comparison of Ring-Porous Wood and Diffuse-Porous Wood －
Kwon, Goo-Joong ; Kwon, Sung-Min ; Kim, Nam-Hun ;
Journal of the Korean Wood Science and Technology, volume 31, issue 4, 2003, Pages 8~15
This study was carried out to investigate the dimensional stability of wood treated with PEG for better utilization of domestic small-diameter logs. Four species of ring- porous wood(Quercus mongolica FISCH, Quercus variabilis BLUME, Fraxinus rhynchophylla HANCE, Paulownia coreana UYEKI,) and four species of diffuse-porous wood(Prunus sargentii REHDER, Betula davurica PALL, Populus tomentiglandulosa T. LEE, Cornus controversa HEMSLEY) were used for this experiment. The shrinkage of wood decreased with increasing the concentration of PEG. The shrinkage of diffuse- porous woods was lower than that of ring-porous woods. The weight gain increased in proportional to the PEG concentration. Diffuse-porous woods showed a little higher weight gain than ring-porous woods. Bulking effect also increased with increasing the PEG concentration, but was in inverse proportional to the molecular weight of PEG. Diffuse-porous woods showed higher bulking effect than ring-porous woods. Consequently, diffuse-porous woods showed better dimensional stability than ring- porous woods. It was considered that dimensional stability was affected by characteristics of wood such as vessel and tylosis, and density.
Studies on Biological Activity of Wood Extractives(XII) Studies on Biological Activity of Wood Extractives(XII) Heartwood of Prunus Sargentii (2) －
Lee, Hak-Ju ; Lee, Sung-Suk ; Choi, Don-Ha ;
Journal of the Korean Wood Science and Technology, volume 31, issue 4, 2003, Pages 16~23
Four flavonoids were isolated from the heartwood of Prunus sargentii. The structures were identified by NMR spectroscopic analysis: prunetin as isoflavone, angophorol, and sakuranetin as flavanone, and isosakuranin as flavanone glycoside. However, these compounds indicated low antifungal and antioxidative activities. In this regard, it could suggest that high antifungal and antioxidative activities of extractives of P. sargentii have no ralationship with these compounds.
Effect of Zephyr Producing Method on Properties of Bamboo Zephyr Boards
Kim, Yu-Jung ; Roh, Jeang-Kwan ; Park, Sang-Jin ;
Journal of the Korean Wood Science and Technology, volume 31, issue 4, 2003, Pages 24~30
In order to develop structural 'bamboo zephyr board', properties of boards produced by various methods making zephyr were estimated. All of boards were tested with KS(Korean Standards) F 3014 Particle board, and results were summarized as follow. The zephyr boards produced by final 1.5 mm roller space had the best properties(MOR, MOE and IB strength) among boards produced by different final roller space. Also, they had the best properties(MOR and MOE) in bending test after 1 hour soaking treatment after 2 hour-boiling in water, which were similar to properties of boards in dry-condition. Thickness swelling(TS) of all boards was less than 12% required to the Korean Standards A 3014. Zephyr boards produced by final 1.5 mm roller space also had the lowest values among all of boards. Boards produced by non-treatment (in green condition) had the better strength than those of boards produced by different pre-treatment methods(boiling in water and in 0.3% NaOH) in bending test.
Drying Boards of Populus alba
P. glandulosa in Conventional, High-Temperature and Microwave-Vacuum Kilns
Kang, Ho-Yang ;
Journal of the Korean Wood Science and Technology, volume 31, issue 4, 2003, Pages 31~37
Flat-sawn 32 mm-thick boards of Populus alba
P. glandulosa, one of major plantation species in this country, were dried in conventional, high-temperature and microwave-vacuum (MW/V) kilns. The average green specific gravity of the specimens used in this study was 0.349
0.074. Their average green moisture contents of heartwoods and sapwoods were around 200% and 100%, respectively. From green to oven-dry they shrunk 2.4 and 7.3% in radial and tangential directions, respectively, and there was no discrepancy between heartwoods and sapwoods. It took 65, 35 and 22 hours to dry from green to 10% moisture content in conventional, high-temperature and MW/V kilns, respectively. A colorimetry study showed that the surface color of the specimens dried in a MW/V kiln was clearer and lighter than those in other kilns.
Effect of Accelerated Weathering on the Leaching of Copper from Preservative Treated Wood
Lee, Myung-Jae ; Lee, Dong-Heub ; Kim, Gyu-Hyeok ;
Journal of the Korean Wood Science and Technology, volume 31, issue 4, 2003, Pages 38~43
This is the second in a series of reports on the evaluation of weathering durability of waterborne preservative treated wood by accelerated weathering. The leaching of copper from ACQ-, CCA-, and
-treated samples during weathering was increased by UV irradiation, when compared between full weathering and water-only weathering. The FTIR spectra of the weathered ACQ-, CCA,
-treated samples at 1731
, which are related to the fixation of copper, were different from those of unweathered controls. This result means that UV irradiation can weaken the chemical bond between lignin and copper and/or extraction of lignin-copper complex can be occured when lignin erode away by weathering.
Evaluation of Weathering Durability of Waterborne Preservative Treated Wood by Accelerated Weathering
Lee, Myung-Jae ; Lee, Dong-Heub ; Kim, Gyu-Hyeok ;
Journal of the Korean Wood Science and Technology, volume 31, issue 4, 2003, Pages 44~49
This study was carried out to evaluate the weathering durability of waterborne preservative (AAC, ACQ, CCA, CuAz) treated Japanese red pine (Pinus densiflora S. et Z.) sapwood samples by accelerated weathering, and to find out the factor of stability. When considered the color changes, weight losses, surface degradation, and microstructure changes due to weathering, ACQ-, CCA-, and CuAz-treated samples were durable against weathering; the weathering durability of AAC-treated samples was poor and similar to untreated controls. The lignin content in aqueous extracts collected from ACQ-, CCA-, and CuAz-treated samples during weathering was lower than that from untreated and AAC-treated ones. From these findings, we might concluded that weathering durability of ACQ-, CCA-, and CuAz-treated samples was enhanced by the fixation of preservative component(s) onto the lignin structure, which is very susceptible to weathering.
Solvent Extraction of Preservative Components from CCA Treated Wood
Kim, Gyu-Hyeok ; Kong, Il-Gon ; Ra, Jong-Bum ; Cho, Jae-Sung ; Kim, Jae-Jin ;
Journal of the Korean Wood Science and Technology, volume 31, issue 4, 2003, Pages 50~56
This research was performed to select an appropriate agent to extract preservative components from CCA-treated wood, and then to evaluate the effect of reagent concentration, extracting temperature, and extracting time on the removal of chrome, copper, and arsenic from treated wood. Hydrogen peroxide was selected as the best extracting agent when considered extraction yield as well as use and environmental safety. Its extraction yield was dependent on extracting variables (temperature, concentration, and time), and a highly significant interaction existed among variables. It should be possible to optimize extraction by manipulating these extracting variables. The results may suggest that the required temperature conditions for the reasonable removal of CCA components are at least above
because extracting time is too long at low temperature (
). Reagent concentrations for extracting at above
should be decided by considering the extracting time.
Mechanical and Oven-drying Characteristics of Pinus densiflora Wood Damaged by Forest Fire
Hwang, Won-Joung ; Kwon, Gu-Joong ; Park, Jong-Su ; Kim, Nam-Hun ;
Journal of the Korean Wood Science and Technology, volume 31, issue 4, 2003, Pages 57~62
The Mechanical and drying characteristics of Pinus densiflora wood, which was damaged by forest fire, and sound wood were examined. There were no significant differences in axial compressive properties, shearing strength and impact bending absorbed energy between damaged and sound woods. But the bending properties of damaged wood were slightly higher than those of sound wood. The green moisture content of sapwood in damaged wood was lower than that in sound wood, but oven-drying rate was similar in both woods. Number of initial check in damaged wood was smaller than that in sound wood, and inner check in damaged and sound woods was not observed. Consequently, it is considered that mostly damaged wood by forest fire can be used for wood material after removing the bark.
Chemical Constituents from the Fruit Bodies of Tricholoma matsutake
Lee, Hak-Ju ; Choi, Yun-Jeong ; Ka, Kang-Hyeon ; Bak, Won-Chul ;
Journal of the Korean Wood Science and Technology, volume 31, issue 4, 2003, Pages 63~70
One alkaloid derivatives, one amide and two steroids were isolated from the fruit bodies of Tricholoma matsutake. The structures were determinded as adenosine, methyl trans-cinnamate, ergosterol and ergosta-4, 6, 8 (14), 22-tetraen-3-one, respectively, on the basis of spectroscopic data.
Lignin Degradation of Pine Wood by Unidentified Decay Fungi and Observation by Scanning Electron Microscope
Park, Heon ; Min, Kyeong-Heui ;
Journal of the Korean Wood Science and Technology, volume 31, issue 4, 2003, Pages 71~80
The lignin degrading fungi were isolated from decayed woods and fruiting bodies gathered in forest area. Lignin degradation ability was investigated by Klason lignin of microbial treated pine wood. Among selected fungi, CJ-6 had 49.48% Klason lignin loss which was greater than 40.58% shown by Trametes versicolor that it is known as a typical lignin degrading fungus. Also, the biodegradation process and morphological features of degraded pine wood by selected fungi were observed with the scanning electron microscope. At the stage of 20 days incubation, mycelia invasion was observed without any failure of wood structure. At 60 days, wood decay was gone in some degree and one part of tracheid and ray wall was destroyed. At 100 days, tracheid wall was severely destroyed, and distinction between ray cell was difficult as cell wall was decayed much.
Application of Korean Rhus Lacquer Containing Tung Oil For Exterior Coatings
Song, Byong-Min ; Lee, Byoung-Hoo ; Kim, Hyun-Joong ;
Journal of the Korean Wood Science and Technology, volume 31, issue 4, 2003, Pages 81~90
In this study, we investigated the weathering properties of Korean Rhus lacquers containing tung oil and their potential use as exterior coatings. The finished lacquers were prepared with a raw Korean Rhus lacquer or refined Korean Rhus lacquer content of 10, 20, 30 and 40 wt.% (corresponding to ratios of 10/90, 20/80, 30/70 and 40/60 by weight of Korean Rhus lacquer/tung oil, respectively). The curing temperature of the prepared lacquer increased with increasing the content of the raw Korean Rhus lacquer. This increased curing temperature is related to higher proportion of hydroxyl groups in the prepared lacquer, due to the content of the raw Korean Rhus lacquer. In accelerated weathering testing, the changes in the gloss and contact angle of the prepared lacquers showed a similar trend to that of traditional exterior oil stain. In addition, the prepared lacquers containing tung oil showed greater discoloration than traditional exterior oil stain. However, the discoloration of the prepared lacquer with a raw Korean Rhus lacquer content of 40 wt.%, and that of the prepared lacquer with refined Korean Rhus lacquer contents of 30 wt.% and 40 wt.%, showed a similar trend to that of traditional exterior oil stain. Consequentially, these prepared lacquers showed a potential for being used as exterior coatings.