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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 37, Issue 6 - Nov 2009
Volume 37, Issue 5 - Sep 2009
Volume 37, Issue 4 - Jul 2009
Volume 37, Issue 3 - May 2009
Volume 37, Issue 2 - Mar 2009
Volume 37, Issue 1 - Jan 2009
Selecting the target year
Color Control and Durability Improvement of Yellow Poplar (Liriodendron tulipifera) by Heat Treatments
Yoon, Kyung-Jin ; Eom, Chang-Deuk ; Park, Jun-Ho ; Kim, Ho-Yong ; Choi, In-Gyu ; Lee, Jun-Jae ; Yeo, Hwan-Myeong ;
Journal of the Korean Wood Science and Technology, volume 37, issue 6, 2009, Pages 487~496
The sapwood of yellow poplar is very bright while its heartwood is usually greenish which changes to dark brown with weathering. This difference in color value between sapwood and heartwood causes difficulty in using yellow poplar as higher value added materials such as interior finish and furniture part. In this study, hot-water treatment, vacuum-heat treatment and oven-heat treatment were carried out to reduce the difference in color value between heartwood and bright sap wood and to increase durability. FT-IR analysis, contact angle measurement and decay test were carried out to find out the mechanism of functional group change and the increment of durability by heat treatment. The result of decrement ratio of color difference were 45.7% by hot-water treatment, 26.8% by vacuum-heat treatment, and 60.2%, 87.8%, and 88.8% by 180
oven-heat treatments respectively. Furthermore, it has been found that oven-heat treatment causes decrement of mass loss by decay in this study. It is suggested that oven-heat treatment could be environmentally friendly preservative treatment without chemicals.
Change in Weight, Moisture Content, and Dimensionat the Early Stage of Adsorption-desorption of Polyethylene Glycol-treated Woods
Kwon, Gu-Joong ; Kim, Nam-Hun ; Chun, Kun-Woo ;
Journal of the Korean Wood Science and Technology, volume 37, issue 6, 2009, Pages 497~504
The characteristic changes in weight, moisture content, and dimension at the early adsorptiondesorption stage of PEG-treated Korean pine (Pinus koraiensis), Japanese larch (Larix kaempferi), mongolian oak (Quercus mongolica) and sargent cherry (Prunus sargentii) woods were investigated. The wood samples were treated with PEG 1000, 2000 and 4000, and conditioned at the relative 98%, 65% and 20% for humidities of one week. The weight of Korean pine, Japanese larch and sargent cherry woods treated with PEG 1000 and 2000 during the adsorption-desorption was significantly changed, but mongolian oak was slightly changed. Moisture content was highly Moisture content was highly fluctuated by the change of relative humidity in the three species except oak wood. Although the weight of PEG-treated wood; however, changes in dimension could be prevented by PEG treatment in all species tested.
Mechanical Properties of Wood Flour-Polypropylene Composites: Effects of Wood Species, Filler Particle Size and Coupling Agent
Kang, In-Aeh ; Lee, Sun-Young ; Doh, Geum-Hyun ; Chun, Sang-Jin ; Yoon, Seung-Lak ;
Journal of the Korean Wood Science and Technology, volume 37, issue 6, 2009, Pages 505~516
The effects of wood species, particle size of wood flours and coupling treatment on the mechanical properties of wood plastic composites (WPC) are investigated in this study. Chemical components of wood flour from 3 different wood species were analyzed by the chemical analysis. Wood flours of 40
60 mesh and 80
100 mesh were manufactured from Larix (Larix kaempferi Lamb.), Quercus (Quercus accutisima Carr.), and Maackia (Maackia amuresis Rupr. et Maxim). The wood flours were reinforced into polypropylene (PP) by melt compounding and injection molding, then tensile, flexural, and impact strength properties were analyzed. The order of alpha-cellulose content in wood is Quercus (43.6%), Maackia (41.3%) and Larix (36.2%). The order of lignin content in wood is Larix (31.6%), Maackia (24.7%), and Quercus accutisima (24.4%). The content of extractives in wood is in the order of Larix (8.5%), Maackia (4.4%), and Quercus accutisima (3.9%). As the content of alpha-cellulose increases and the lignin and extractives decreases, tensile and flexural strengths of the WPC increase. At the same loading level of wood flours, the smaller particle size (80
100 mesh) of wood flours showed highly improved tensile and flexural strengths, compared to the larger one (40
60 mesh). The impact strength of the WPC was not significantly affected by the wood species, but the wood flours of larger particle size showed better impact strengths. The addition of maleated polypropylene (MAPP) provided the highly improved tensile, flexural and impact strengths. Morphological analysis shows improved interfacial bonding with MAPP treatment for the composites.
Properties and Manufacture of High Density Woodceramics by Re-carbonization － Effect of Carbonization Temperature －
Oh, Seung-Won ; Hwang, Jung-Woo ;
Journal of the Korean Wood Science and Technology, volume 37, issue 6, 2009, Pages 517~523
Repeated impregnation and carbonization processes were performed to prepare high-density woodceramics using a sawdust board. The physical properties were investigated to confirm morphological and structural changes of one-time and two-time phenolic resin-treated and carbonized woodceramics. As comparing between one-time and two-time carbonized woodceramics, the weight and the density of the two-time carbonized woodceramics decreased with an increase of the carbonization temperature. When the carbonization temperature was 600
, the weight increased by 21.7% and density increased by 20.6% from 0.68 g/
to 0.82 g/
, respectively, as a maximum value.
Estimation of Yield strength and Slip Modulus for Helically Threaded Nail Connection
Hwang, Kweon-Hwan ; Shim, Kug-Bo ;
Journal of the Korean Wood Science and Technology, volume 37, issue 6, 2009, Pages 524~530
In the post-beam structure, the infilled light-frame construction provides most shear strengths. Shear properties of the light-frame structure can be estimated from the shear properties of nailed connection for the sheathings, and those of nailed connections can be done from nail bending strengths. For the basic study to predict the yield strength and the slip modulus of a nailed sheathing shear wall, those of a nailed joint were examined from nail bending strengths. To estimate shear properties of a nailed connection, referenced bearing strength and bearing constant for the wood members and the experimental nail bending strengths of the helically threaded nail were applied. The yield strength using the diameter at grooves instead of shank diameter was well coincided with the experimental value, but the slip modulus was estimated much smaller. The effective factors, specific gravity for the main member, withdrawal by nail head diameter to the side member, and embedment and moment at the nail head were considered, and further examinations are needed for the precise prediction of the nailed connections.
Radial Variations of Ray Spacing and Intra-annual Variation of Biseriate Ray Frequency in Pinus koraiensis and Larix kaempferi Woods Grown in Korea
Kim, Nam-Hun ;
Journal of the Korean Wood Science and Technology, volume 37, issue 6, 2009, Pages 531~536
Radial variations of ray spacing and frequency of biseriate ray were examined in the woods of most commercially important Korean softwood species of Pinus koraiensis and Larix kaempferi. Ray spacing, or ray number per mm in cross section, averaged 4.6 and 9.0 in Pinus koraiensis and Larix kaempferi, respectively. Thus, rays of Larix kaempferi appeared to be more closely arranged than those of Pinus koraiensis. Ray spacing was the densest around pith, and then slowly decreased toward bark. In tangential section, biseriate ray frequency of Larix kaempferi was higher than that of Pinus koraiensis. Biseriate ray was designated, based on the number of cells of biseriate portion in vertical extent, as the type of B+1 (one cell high), B+2 (two cells high), and so on. The dominated type was B+1 in Pinus koraiensis but B+2 in Larix kaempferi. The biseriate ray types of B+3, B+4, and B+5 were occasionally found in earlywood. Interestingly, even B+6 and B+7 types were observed in Larix kaempferi. In conclusion, it was considered that ray spacing could be used for separating juvenile wood from adult wood. Also, characteristics of ray spacing and biseriate ray might be used for identifying these two species.
Utilization of Charcoal as an Environmentally Friendly Building Materials (I) - Characterization of Building Materials Prepared with Charcoal -
Ahn, Byoung-Jun ; Jo, Tae-Su ; Lee, Sung-Suk ; Paik, Ki-Hyon ; Kim, Sun-Ik ;
Journal of the Korean Wood Science and Technology, volume 37, issue 6, 2009, Pages 537~545
The objective of this study was to investigate potential usage of environmentally friendly building materials, liquid mortar and dry cement mortar mixed with charcoal, based on the test of their physical and chemical properties. From the test results of physical and chemical properties of the liquid mortar mixed with charcoal, liquid mortar containing over 20% of charcoal, the consistency viscosity and the non-volatile content met a standard requirement. Drying time was delayed with increase in charcoal contents in the liquid mortar, however they were fully cured within 60 minutes in all treated levels. Other properties were acceptable at standard requirement. From the results, it was found that the proper charcoal addition level to the liquid mortar was 25%. In the results on dry cement, it was found that samples containing 5% of charcoal showed the maximum compressive strength, whereas samples containing over 20% of charcoal did not reach the minimum requirement of KS standard. Water retention ability constantly increased as the charcoal ratio increased. The conventional dry cement mortar adsorbed 59.5% of it, in the test of adsorption rate on ammonia gas, whereas cement mortar containing 10% of charcoal showed 71.6% of ammonia gas adsorption.
Static Bending Strength Performances of Hybrid Laminated Woods Composed of Wood-Wood Based Boards
Park, Han-Min ; Moon, Sung-Jae ; Choi, Yoon-Eun ; Park, Jung-Hwan ; Byeon, Hee-Seop ;
Journal of the Korean Wood Science and Technology, volume 37, issue 6, 2009, Pages 546~555
To study an effective use of woods, three-ply hybrid laminated woods instead of crosslaminated woods which are composed of spruce in the face and three kinds of wood-based boards (MDF, PB, OSB) in the core were manufactured, and the effect of constitution elements for the core laminae on bending strength performances was investigated. Bending modulus of elasticity (MOE) of hybrid laminated woods had the highest values for the hybrid laminated wood types arranging OSB laminae in the core, and had the lowest values for those arranging MDF laminae in the core. These values were higher than those of various cross-laminated woods. The estimated bending MOEs of the hybrid laminated woods which were composed of perpendicular-direction lamina of spruce in the faces were similar to their measured values, regardless of wood-based boards in the core. However, those of the hybrid laminated woods which were composed of parallel-direction lamina of spruce in the faces had much higher values than those of their measured values, and it was necessary to revise the measured values. Bending modulus of rupture (MOR) of the hybird laminated woods had the highest value for those arranging OSB laminae in the core, and had the lowest values for those arranging PB laminae in the core unlike the bending MOE. By hybrid laminating, the anisotropy of bending strength performances was markedly decreased, and the differences of strength performances among wood-based boards were also considerably decreased.
The Verification of Image Merging for Lumber Scanning System
Kim, Byung-Nam ; Kim, Kwang-Mo ; Shim, Kug-Bo ; Lee, Hyoung-Woo ; Shim, Sang-Ro ;
Journal of the Korean Wood Science and Technology, volume 37, issue 6, 2009, Pages 556~565
Automated visual grading system of lumber needs correct input image. In order to create a correct image of domestic red pine lumber 3.6 m long feeding on a conveyer, part images were captured using area sensor and template matching algorithm was applied to merge part images. Two kinds of template matching algorithms and six kinds of template sizes were adopted in this operation. Feature extracted method appeared to have more excellent image merging performance than fixed template method. Error length was attributed to a decline of similarity related by difference of partial brightness on a part image, specific pattern and template size. The mismatch part was repetitively generated at the long grain. The best size of template for image merging was 100
100 pixels. In a further study, assignment of exact template size, preprocessing of image merging for reduction of brightness difference will be needed to improve image merging.
Chemical and Morphological Change and Discoloration of Cedar Wood Stored Indoor
Lee, Kwang-Ho ; Cha, Mi-Young ; Chung, Woo-Yang ; Bae, Hyeun-Jong ; Kim, Yoon-Soo ;
Journal of the Korean Wood Science and Technology, volume 37, issue 6, 2009, Pages 566~577
The modification of wood color occurs rapidly during the service period at indoor. It is crucial to investigate the characteristics of color change, chemical and microscopical modification of wood at indoor. Wood products made of Japanese cedar at different years were used for this work. The tests were performed in order to evaluate the degree of color change of wood surface, breakpoint of brightness from surface to inside of wood, chemical analysis with FT-IR, and microscopical characteristics using the LM and TEM. Surface color of cedar wood stored indoor were rapidly changed at early stage, particularly
a (yellow), and
b (red) values were steeply decreased for one year old indoor wood,
L (white) value was dropped until 5 years old indoor wood compared with control sample. Decrease of peaks related to polysaccharide and lignin was noticed, especially, lignin was severely degraded. Although degradation of cell wall limited only to surface layers of indoor wood, degradation pattern of indoor wood showed similar degradation pattern to natural weathering of wood during outdoor weathering or wood behavior under artificial UV irradiation.
Acid Hydrolysis Characteristics of Yellow Poplar for High Concentration of Monosaccharides Production
Shin, Soo-Jeong ; Park, Jong-Moon ; Cho, Dae-Haeng ; Kim, Yong-Hwan ; Cho, Nam-Seok ;
Journal of the Korean Wood Science and Technology, volume 37, issue 6, 2009, Pages 578~584
We investigated acid hydrolysis characteristics of yellow poplar woodmeal with concentrated sulfuric acid for high concentration of monosaccharides production. Woodmeal to 72% sulfuric acid ratio (w/w), 2nd hydrolysis temperature and time were main variables for finding optimum reaction condition. Optimum woodmeal to 72% sulfuric acid ratio was 1 : 2.61 (w/w) and 2nd hydrolysis temperature and time was 105
and 40 min as 44.8 g/L of glucose and 25.2 g/L of xylose in hydrolysis solution. In this acid hydrolysis solution, furfural, 5-HMF, low molecular weight phenolic compounds were identified. Furfural and 5-HMF concentration were increased as increasing 2nd hydrolysis time. More than 40 min of 2nd hydrolysis at 110
, xylose concentration was decreased but glucose concentration was leveled out because xylose to furfural reaction was faster than xylan to xylose, but cellulose to glucose reaction was similar rate with glucose to 5-HMF at that 2nd hydrolysis reaction condition.
Antifungal Activity against Trichoderma spp. of Water Soluble Essential Oil extracted from Pinus densiflora and Chamaecyparis obtusa
Yeo, Hee-Dong ; Jung, Ji-Young ; Nam, Jung-Bin ; Kim, Ji-Woon ; Kim, Hee-Kyu ; Choi, Myung-Suk ; Alm, Glen ; Rinker, Danny Lee ; Yang, Jae-Kyung ;
Journal of the Korean Wood Science and Technology, volume 37, issue 6, 2009, Pages 585~599
This study was carried out to investigate the antifungal activity of the water soluble essential oil against Trichoderma spp. Water soluble essential oils from Pinus densiflora and Chamaecyparis obtusa were obtained from GAP (Gas assisted process) extraction apparatus. When the water soluble essential oil was treated, the growth of the conidial germination was maximum under the cultivation condition at 25
and in the culture medium adjusted to pH 5.0. The yield of water soluble essential oil was 3.9% and 3.7% in P. densiflora and C. obtusa, respectively. 24 and 15 kinds of compounds were identified in water soluble essential oils of P. densiflora and C. obtusa, respectively. The major components in the essential oil of P. densiflora were
-Terpineol acetate and Terpinen-4-ol and those of C. obtusa were Terpinen-4-ol and
-Terpineol. Antifungal activity was the best in the 5000 ppm of P. densiflora against Trichoderma harzianum and in 5000 ppm of C. obtusa against Trichoderma atroviride.
International Conference on Wood Adhesives 2009 참관기
Seo, Jeong-Gi ; Kim, Su-Min ;
Journal of the Korean Wood Science and Technology, volume 37, issue 6, 2009, Pages 600~603