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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 32, Issue 6 - 00 2004
Volume 32, Issue 5 - 00 2004
Volume 32, Issue 4 - 00 2004
Volume 32, Issue 3 - 00 2004
Volume 32, Issue 2 - 00 2004
Volume 32, Issue 1 - 00 2004
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The Removal of Heavy Metals from Treated Wood by Biological Methods(II) - Removal of Heavy Metals from CCA and CCFZ-treated Wood-
Son, Dong-Won ; Lee, Dong-Heub ; Kang, Chang-Ho ;
Journal of the Korean Wood Science and Technology, volume 32, issue 2, 2004, Pages 1~8
Heavy metals were removed from CCA• and CeFZ- treated wood using a brown-rot fungi Tyrornyces palustris: The amount of effective elements extracted from treated woods was compared for different treatment methods. The relationship between the amount of heavy metals removed and concentrations of oxalic add for treated wood was examined. Also, the relationship between mycelia weight and removal rate was examined. T'he removed quantity of heavy metal from treated wood according to fermentation methods was examined. The extraction amount of chromium and arsenic components increased with increasing oxalic acid concentration, but the extraction amount of copper did not improved much. A 287 mg of mycelia weight can remove chromium and arsenic over 600% in 3g CCA chips and copper was also removed over 50% The chromium, copper and arsenic were removed over 60% by shaking fermentation, the removal rate of copper by static cultivation was higher than that of shaking fermentation. The removal rate of chromium, copper ami arsenic were 72%, 61% and 59% with air•lift bioreactor, respectively.
Effect of low pressure steam explosion treatment on prevention of resin exudation from wood under high temperature surroundings
Lee, Nam-Ho ; Park, Hee-Jun ; Li, Cheng-Yuan ; Jin, Young-Moon ;
Journal of the Korean Wood Science and Technology, volume 32, issue 2, 2004, Pages 9~18
This study was carried out to find the efficient methods for preventing resin exudation from spruce (Picea) board during high temperature environment service. In the dry-air oven test, in-use temperature related to resin exudation of 110
could be obtained by the appropriate kiln drying without any special treatment, and the in-use temperature of the radio-frequency/vacuum (RF/V)-dried boards was approximately 20
higher than that of the conventional kiln-dried boards. In the autoclave test, resin exudation was not found from any board dried in the conventional kiln and in the RF/V kiln after the low pressure steam explosion (SE) treatment, while for the control resin, exudations were more severe in the autoclave test above 130
than in the dry-air oven test. It is suggested that resin exudation during high temperature service condition can be prevented more effectively by super-heated steaming green boards than by high-temperature drying boards with low moisture.
Determination of Trend of a Radial Distribution of Moisture Content within a Log Cross Section by Oven-Drying of Circumferential Slices(II) -For some of domestic softwoods
Lee, Nam-Ho ; Li, Cheng-Yuan ; Choi, Jun-Ho ; Hwang, Ui-Do ; Jin, Young-Moon ;
Journal of the Korean Wood Science and Technology, volume 32, issue 2, 2004, Pages 19~25
This study was carried out to investigate a radial distribution of moisture contents (MCs) within a log cross section (LC) during oven-drying of 3 mm-thick circumferential slices cut from several domestic softwoods LCs. For Korean red pine, drying rate of sapwood slices during oven-drying represented much higher values than that of heartwood slices, and so sapwood with higher green MC early reached below fiber saturation point (FSP) rather than heartwood did. However, this distribution of moistures did not last for long duration. For Japanese larch, green MC of sapwood was approximately three times higher than that of heartwood. This similar distribution in MC was lasted until about 20% average MC. The MC was around uniform throughout the sapwood of Ginkgo when green and during oven-drying, although it was somewhat fluctuated. For Japanese cedar, the heartwood with so low moistures around FSP would begin to shrink from the beginning stage of drying, but the sapwood above hygroscopic MC prevents the heartwood from shrinking, and consequently, the heartwood or the transition wood goes into tension stress. The results for Japanese cypress showed that the green MCs of the sapwoods were much lower than those for heartwoods, and then this trend was continued until about 20% in average MC. For Chinese thuja, the green MCs of sapwoods were about 2 times as high as those of heartwood, but this along the radial gradient in MC rapidly became gentle during oven-drying.
Chemical Composition and Alkaline Pulping of a Stem of Red Pepper (Capsium annuum L.)
Kim, Chul-Hyun ; Kim, Young-Yook ; Park, Soung-Bae ; Eom, Tae-Jin ;
Journal of the Korean Wood Science and Technology, volume 32, issue 2, 2004, Pages 26~32
Chemical compositions and chemical structure of lignin and alkali cooking condition and fiber length of red pepper were investigated and compared to those of woods. The chemical compositions of red pepper were higher component of extraction than that of wood. The contents of carbon and hydrogen of Klason lignin in red pepper were similar to that of pine and birch wood. On the other hand, the contents of oxygen and nitrogen of Klason lignin in the red pepper were higher than that of wood. The result of nitrobenzene oxidation shows that Klason lignin of reel pepper was similar to lignin of softwood. The best alkali cooking condition of reel pepper was 0.2%-anthraquinone, active alkali of 20% and liquor ratio of 1 : 7. The fiber length of red pepper was about 0.47 mm, Therefore, the red pepper fiber will he able to use special purpose of short fiber.
Extractives from Magnolia sieboldii
Choi, In-Ho ; Lee, Hak-Ju ; Choi, Don-Ha ; Park, Jae-In ; Choi, Tae-Ho ;
Journal of the Korean Wood Science and Technology, volume 32, issue 2, 2004, Pages 33~39
Four phenolic compounds were isolated from the wood and bark of Magnolia sieboldi; The structures were determined as : costunolide (I), syringin (II), 1, 2-dihydroxyxanthone On), and vanillic acid (IV), respectively, on the basis of spectroscopic data.
Physical and Mechanical Properties of Pbyllostacbys pubescens Treated with Hot Water and Microwave Irradiation
Shin, Hoon-Jae ; Ahn, Sang-Yeol ; Byeon, Hee-Seop ; Park, Sang-Bum ; Kong, Young-To ;
Journal of the Korean Wood Science and Technology, volume 32, issue 2, 2004, Pages 40~49
Pbyllostacbys pubescens planted in the Nambu Forest Experiment station in Jinju city of Gyongnam province was used, to investigate the physical and mechanical property of bamboo in this study. The ages of the P. pubescens were 1, 2 and 3 years, respectively. This experiment was carried out in August and January. The P pubescens were divided into upper, middle and lower parts according to the growing points. The physical and mechanical properties of the P. pubescens were investigated before and after treatment of hot water and microwave irradiation. 1. The upper part of the P. pubescens indicated the highest static MOE according to the growing points. The range of the static MOE was from 70,000 to 110,000
2. When P. pubescens were treated with hot water of 95
the ratio of softening was about 10~30%. 3. As microwave irradiation time was increased, the MOE values was decreased in both green and water-saturated bamboos. For the irradiation time of 20 and 30 seconds, the static MOE of P pubescens was decreased up to about 50% comparing with non-treated.
Properties of Pinus densiflora Timber Wood by High Temperature Linseed Oil Treatment
Lee, Dong-Heub ; Lee, Myung-Jae ; Oh, Hyung-Min ; Son, Dong-Won ;
Journal of the Korean Wood Science and Technology, volume 32, issue 2, 2004, Pages 50~57
This study attempted to evaluate the water repellency and drying effectiveness of linseed oil treated-solid wood at high temperature by immersion. The moisture content of green wood (Pinus densiflora) sample (above 90%) was reduced about 10% after 6 hours treatment at 150
. When the treated samples were cut into cross section along the length, it was observed that the linseed oil penetrated into up to 20% of the sample cross section area in all locations, However, a strength loss of the specimen was not detected, The pre-drilling before linseed oil treatment was effective in reducing the defects such as checks and splits, and improved the linseed oil penetration into all samples from the surfaces, The result of water absorption test of treated-wood showed that the water repellent efficacy of treated-wood was greater than that of the control. The anti-fungal activity of treated samples using five sap stains and thee decay fungi was not detected in broad-spectrum toxic mechanism. However, decay test using white rot fungi (Tyromyces palustrtis) and brown rot fungi (Trametes iersicolor) showed that the treated sample has a decay resistance to these two fungi.
Utilization of Biomass Resources(I) -HPLC Analysis of Chemical Components for Utilization of Chestnut Inner Bark-
Kim, Yun-Geun ; Jo, Jong-Soo ;
Journal of the Korean Wood Science and Technology, volume 32, issue 2, 2004, Pages 58~64
For the utilization of chestnut inner bark as forest biomass, the diethyl ether solubles of hot water extract from chestnut inner bark was analyzed by HPLC. Each peak was identified by comparing with retention time of standard regents and their purity from obtained UV spectrum by RI detector. Identified 6 compounds were gallic acid, 35-dihydroxybenzoic acid, 2,4,6-trihydroxybenzoic acid and protocatecualdehyde as phenolic acids and aldehyde, and catechin and epicatechin as flavonoids.
Measurement of Formaldehyde Emissions during Hot-Pressing of Particleboard Bonded with Melamine-Urea-Formaldehyde Resin
Lee, Jong-Kyu ; Oh, Yong-Sung ;
Journal of the Korean Wood Science and Technology, volume 32, issue 2, 2004, Pages 65~72
A melamine-urea-formaldehyde (MUF) resin, based on 5 percent melamine addition of the resin solids weight, was synthesized in the laboratory for particlehoard (PH) manufacture, Laboratory PBs were made with the MLlF resin at three press times (3, 4, 5 rnin) and two resin application rates (6, 8, percent). Enclosed caul system was used for collecting the exhaust gases materials generated during the hot-pressing of PEs. Exhaust gases materials generated inside the enclosed caul during the hot-pressing of PBs were collected in a controlled air stream. Formaldehyde from the exhaust gases collected was determined per a chromotropic method of the National Institute of Occupational Safety and Health Method 3500. The measurement results showed that formaldehyde emissions during the hot-pressing of PB significantly increased with increasing press time, and MUF resin application rates. PB' performance test results showed that internal hand (Ib) of PE made with 3-minute press time exceeded the minimum requirement for KS F 3104 PE type 8.0.
Characteristics of Fluoride-based Anti-stain Chemicals Made from Industrial By-product(I) -Anti-mold Effectiveness, Iron Corrosivity and Hygroscopicity-
Lee, Jong-Shin ;
Journal of the Korean Wood Science and Technology, volume 32, issue 2, 2004, Pages 73~81
To develope of the inexpensive anti-stain chemicals, it was conducted to investigate the inhibitory effectiveness of mycelial growth and anti-mold effectiveness against test fungi causing surface mold of wood, iron corrosivity and hygroscopicity of six fluoride-based chemicals made from industrial byproduct. Among the six chemicals. RNF-3 and RNF-4 were the most effective with respect to a mycelia growth control and anti-rnold effectiveness. For the wood treatment with these chemicals, the optimum concentration was about 2% and there was no difference in the effectiveness of chemicals between wood species. The wood treated with synthesized chemicals showed a relatively high iron corrosion rate for corrosive F component whereas, in the treatment with RNF-3 and RNF-4, there was no difference from the untreated wood when the concentration was less than 2%. The hygroscopic property of wood was not effected by treatment of these chemicals. To prove the feasibility for practical using of RNF-3 and RNF-4 chemicals, it is necessary to test of anti-mold effectiveness in the sawmill by field test.
Characteristics of Fluoride-based Anti-stain Chemicals Made from Industrial By-product(II) -Fungicidal Effectiveness against Isolated Fungi Through Laboratory Evaluation and Field Evaluation
Lee, Jong-Shin ;
Journal of the Korean Wood Science and Technology, volume 32, issue 2, 2004, Pages 82~89
Two kinds of chemicals (RNF-3 and RNF-4) with high anti-maid effectiveness against stored fungi causing fungal discoloration was selected from among the six kinds of fluoride-based chemicals in the preceding study. In this study, the anti-mold test using 16 species fungi isolated from the softwood lumbers which were fungal discolored and field test in the sawmill was carried out to prove the feasibility for practical using of selected chemicals. For the isolated fungi, the RNF-3 consist of F and Cu showed high mycelial growth control in the PDA medium and fungicidal effectiveness in the japanese red pine tPinus densiflorai, korean pine (Pin us koraiensis) and radiata pine (Pinus radiatai when the concentration was 2% or more, However the RNF-4 consist of F only was not effective compared with RNF-3 because of mycelial growth in the PDA medium and wood treated with 2% or more chemical solution, The RNF-3 also showed a strong anti-mold effectiveness because there was no fungal discoloration for the radiata pine boards treated by 2% and 10min. soaking in the field test. These results mean that RNF-3 can be used as domestic anti-stain chemicals for prevention of fungal discoloration of the soft wood lumber.
Visual Log Grading and Evaluation of Lamina Yield for Manufacturing Structural Glued Laminated Timber of Pitch Pine
Shim, Sang-Ro ; Yeo, Hwan-Myeong ;
Journal of the Korean Wood Science and Technology, volume 32, issue 2, 2004, Pages 90~95
Pitch pine (Pinus rigida) has heen planted in Korean forests for several decades, primarily for erosion control and use as a fuel supply. To enhance its value, and especially potential use as lamina for structural glued laminated timber (glularn), log quality and lumber yield of pitch pine were evaluated in this study. Trees from pure pitch pine stands with an average diameter at breast height of 32 cm were felled and bucked into 3.6m long 15 cm minimum burr-end diameter logs. Over 80%, of the logs were classified to No.2 or No.3 visual grade group. Upon sawing total lumber yield was 55.2%, 39.9% for structural glulam lamina, 7.2% for louver, and 8.1% for miscellaneous use. The final lumber yield for manufacturing structural glulam, after cross-cutting to eliminate knots and finger jointing, was only 15.3%. To enhance this manufacturing yield requires that the rate of knot-included lumber used as lamina he raised, However arrangement of the knot-included lamina, whose mechanical properties need to be accurately evaluated, must he optimized to minimize any reduction to the structural glularn strength. The log quality and lumber yield of pitch pine evaluated in this study are expected to facilitate proper planning for wood product manufacture in the Korean lumbering and glulam industrial field, which has not previously dealt with this species.