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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 41, Issue 6 - Nov 2013
Volume 41, Issue 5 - Sep 2013
Volume 41, Issue 4 - Jul 2013
Volume 41, Issue 3 - May 2013
Volume 41, Issue 2 - Mar 2013
Volume 41, Issue 1 - Jan 2013
Selecting the target year
Measuring PEG Retentions and EMCs of PEG Impregnated Softwood Specimens after Heat-treatment
Hong, Seung-Hyun ; Kim, Chung-Ho ; Lim, Ho-Mook ; Kang, Ho-Yang ;
Journal of the Korean Wood Science and Technology, volume 41, issue 3, 2013, Pages 173~180
DOI : 10.5658/WOOD.2013.41.3.173
This study was carried to provide basic data for the research of the effect of PEG impregnation on preventing wood from cracking during heat treatment. Three popular softwood species were selected for investigating the PEG penetration rate and retention depending on PEG molecular weight, PEG retention after heat treatment and their EMCs. The average retentions of PEG400 were reversely proportional to the basic densities of three species and those of the other PEGs showed similar behaviour as well. It is obvious that PEG retention decreased as PEG molecular weight increased with a species. PEG impregnation increased or decreased the moisture contents of the specimens within 2%, and increased their basic densities by 16.8% as a maximum. The Weight Percentage Losses of PEG400 during heat treatment were the largest among three PEG levels, which implied that lower molecular weight PEG leached more than the highers. There was less difference in EMC between PEG impregnated and control specimens at low RH, but their difference increased at high RH.
Analysis of Charcoal from Quercus phillyraeoides
Shin, Soo-Jeong ; Kim, Byung-Ro ;
Journal of the Korean Wood Science and Technology, volume 41, issue 3, 2013, Pages 181~186
DOI : 10.5658/WOOD.2013.41.3.181
In this work, charcoal making characteristics of Quercus phyllyaeoides (which has been known as one of best raw materials for charcoals) was investigated. Charcoal from Quercus phyllyaeoides had more than 85% of fixed carbon, which is 5~25% higher fixed carbon content than other charcoals. Also specific gravity of this charcoal was more than 1.0, which is quite higher than other black charcoals (average of commercial products: 0.52) or white charcoals (average of commercial products: 0.73). Methylene blue adsorption, pH, and adsorption of water vapour was lower than other commercial charcoals. Carolic value of this charcoal was similar to other commercial products. Far infrared ray`s emission from this charcoal was higher than others. Application of charcoal from Quercus phyllyaeoides should be consider the characteristics of this product.
Current Research Trends in Wood Preservatives for Enhancing Durability - A Literature Review on Non-Copper Wood Preservatives -
Kim, Yeong-Suk ;
Journal of the Korean Wood Science and Technology, volume 41, issue 3, 2013, Pages 187~200
DOI : 10.5658/WOOD.2013.41.3.187
Current research trends of non-copper wood preservatives for enhancing durability was reviewed; as a follow-up of the review in 2012 on copper-based wood preservatives. Main environmental friendly non-copper wood preservatives studied by many scientists were boron-based compounds, synthetic compounds from natural products, and pyrethroids family of chemicals, etc. The critical issue regarding treated woods with boron-based compounds used outdoors was the leaching of boron. Many studies mainly focused on boron fixation improvement using variety of polymers. Moreover, the studies showed notable increases in attempts to use natural products used commonly in the medical fields as wood preservatives as well as outdoor use of chemical modified such as acetylated wood developed in purpose of stabilizing dimension.
Species Identification of Wooden Elements Used for Daewungjeon Hall in the Bukjijangsa Temple, Daegu, Korea
Yeon, Jung-A ; Park, Won-Kyu ;
Journal of the Korean Wood Science and Technology, volume 41, issue 3, 2013, Pages 201~210
DOI : 10.5658/WOOD.2013.41.3.201
The purpose of this study was to examine the species of 117 wooden elements which were used in the Daewungjeon Hall (National Treasure No. 805, constructed in A. D. 1659) of Bukjijangsa Temple, Daegu, Korea. Pillars were identified as 5 red pines (hard pines; most likely, Pinus densiflora S. et Z.), 2 Cerris section of subgenus Lepidobalanus (deciduous oaks) and 3 Tsuga spp. Hwalju columns were 3 Abies spp. and 1 red pine. Head-penetrating ties were 8 red pines and 1 Cerris sp.; Pyeongbang, 3 red pines and 6 Cerris spp. Purlins were identified as 17 red pines, 16 Cerris spp. and 1 Tsuga sp. Angle rafters were 3 red pines and 1 Cerris sp., and end angle rafters, 2 red pines, 1 Zelkova serrata and 1 exotic hard pine. All of brackets (31 woods), jangyeo (4) and deot-chunyeo (2) were identified as red pines. As a whole, red pines (70.1%) and Cerris (22.2%) were major species used in the Daewungjeon Hall of Bukjijangsa Temple. Tsuga, Abies and exotic hard pines seem imported woods used for recent repairs.
Withdrawal and Lateral Resistance of Nail Joints Composed of Dimension Lumber and OSB in Light-Frame Wood Construction
Oh, Sei-Chang ;
Journal of the Korean Wood Science and Technology, volume 41, issue 3, 2013, Pages 211~220
DOI : 10.5658/WOOD.2013.41.3.211
The nailed joints in wood construction are commonly designed to resist and carry the lateral load but also subject to withdrawal force like uplift load due to the wind. This research was conducted to evaluate the performance of nailed joint composed of dimension lumber and sheathing materials through the nail withdrawal and unsymmetric double shear joint test, and then compared to current design values. The withdrawal strength was greatly dependant on wood specific gravity, and the withdrawal strength of I-joist with OSB showed higher value in spite of low specific gravity. The maximum withdrawal loads were greater than that of derived current design values about 5 times. The lateral resistance of Japanese larch/OSB nailed joints was higher than that of SPF/OSB nailed joint, and derived allowable lateral strength of nailed joints in this study exceeded the current design values. The failure mode of nailed joints was primarily due to the nail bending and this tendency was notable in SPF/OSB nailed joint.
Effect of End-coating Around Pith of Heavy Timbers of Red Pine and Korean Pine on High-temperature and Low-humidity Drying Characteristics
Lee, Chang-Jin ; Lee, Nam-Ho ; Eom, Chang-Deuk ; Shin, Ik-Hyun ; Park, Moon-Jae ; Park, Joo-Saeng ;
Journal of the Korean Wood Science and Technology, volume 41, issue 3, 2013, Pages 221~233
DOI : 10.5658/WOOD.2013.41.3.221
This study was performed to identify the effect of end-coating around pith of heavy timbers of Red pine and Korean pine on high temperature and low humidity drying characteristics. Total drying times were 268 hours, and ranges of final moisture content was investigated that Red Pine 9.2% to 10.8% MC for square and round timber, in case of Korean Pine 15.0% to 22.0% MC for square timber, 12.8% to 20.4% MC for round timber. Moisture content distribution of Red Pine was a uniform, but part of high moisture content was found in Korean Pine. In case of Korean pine, the surface checks were occurred more severe than in case of Red pine, and end-coating treatment were investigated to be ineffective on surface check. The internal checks were only formed on the two timbers. The value of the case hardenings was investigated that the ranges 3.7% to 9.1% for Red pine. In case of Korean pine, on the other hand, the case hardenings presence a few as 20.9% to 35.8%.
Characteristics of Flame Retardent and Mothproof Conservation of Microwave Heated wood
Kim, Chong-Gun ; Park, Cheul-Woo ; Yoon, Tae-Ho ; Lim, Nam-Gi ;
Journal of the Korean Wood Science and Technology, volume 41, issue 3, 2013, Pages 234~246
DOI : 10.5658/WOOD.2013.41.3.234
It was found that test piece heated rapidly by 3 kW microwave for 5 minutes satisfies the targeted temperature and the percentage of moisture content, and the highest rate of weight increase is obtained in case of 120 minute immersion in the mixture of phosphates and heterocyclic compounds, from the result of such analysis as: kiln drying schedule, flame retardent by flammability test, insect resistance by termites, and permeability of combined penetrant for the wood after assigning multifunctional finish by immersing conifer structural frame, which is used for the frame work of wooden house and indoor/outdoor finishing in flame retardant and insect repellent materials mixture with the remaining heat of microwave. In addition, after a test of flame retardent treated item, it was identified that every mixture of phosphates corresponds with the standards of flame retardent, and upon investigation of moritality of 7 days after putting termites, it was showed that test piece immersed in the mixture of phosphates and heterocyclic compounds has the best characteristics, showing over 96% of high moritality. From the analysis of inward permeability of combined penetrant for the wood, it was decided that excellent performance in the flame retardent and insect resistance of the wood revealed due to full penetration of combined penetrant as it was found that combined penetrant penetrated through the whole inner cells of the wood.
Evaluation on Anti-Dermatophyte Effect of Larix (kaempferi) Essential Oil on the Morphological Changes of Eermatophyte Fungal Hyphae
Kim, Seon-Hong ; Lee, Su-Yeon ; Hong, Chang-Young ; Jang, Soo-Kyeong ; Lee, Sung Suk ; Park, Mi-Jin ; Choi, In-Gyu ;
Journal of the Korean Wood Science and Technology, volume 41, issue 3, 2013, Pages 247~257
DOI : 10.5658/WOOD.2013.41.3.247
This study was to investigate the antifungal activity of Larix kaempferi essential oil against dermatophytes, Epidermophyton floccosum, Trichophyton mentagrophytes and Trichophyton rubrum. The active components of L. kaempferi against dermatophytes were determined (characterized by GC-MS), and the morphological changes of the dermatophytes exposed to the L. kaempferi essential oil were observed by electron microscope. Main component of L. kaempferi essential oil was (-)-bornyl acetate. In antifungal activity tests, MIC of L. kaempferi crude oil was 125 ppm on every fungi and 100% (agar dilution method) at more than 500 ppm. By using SEM and TEM, the fungal morphology of E. floccosum exposed to the L. kaempferi essential oil was different from that of normal hyphal morphology. Hyphae exposed to the L. kaempferi essential oil was damaged with distorted and collapsed surfaces. In addition, there were destruction and disorganization of organelles in cytoplasm and collapse of cell membrane. Active antifungal components from L. kaempferi essential oil were identified as terpene alcohol compounds like (-)-
A Study on the Introduction and Settlement of the Labeling System for Wood-based Products and Expanding in Korea
Kim, Yunhui ; Yeo, Hwanmyeong ; Pang, Sungjun ; Yang, Sangyun ; Kang, Sungmo ; Hwang, Kweonhwan ;
Journal of the Korean Wood Science and Technology, volume 41, issue 3, 2013, Pages 258~268
DOI : 10.5658/WOOD.2013.41.3.258
Wood-based products market is new growth engine industry of "Green growth policy". Korean government established a law, sustainable use of wood, for expanding wood and wood-based products market in 2012. This study was conducted to seek sustainable measures for conservation and management of valuable natural resources, offer expanding quality assurance services for wood-based products, and explore measures for expanding wood-based products labeling system. Through discussed domestic and overseas trends and literatures that concern wood-based products labeling system and investigated case studies that were presently operational. For expanding quality assurance services of wood-based products, Korea Forest Service operates a wood-based products labeling system in integrated management through variety awareness and specialist assessment for each product. This process will make enhanced wood-based products labeling system expanded gradually. To evolve into
party quality assurance services on maturity age of labeling system, public communication will help improve awareness of producer and consumer. appropriate incentive program will attract voluntary participation from woodbased product industry. Producers consider environmental ethics in their business and consumer should exercise their right to know.