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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 26, Issue 4 - Dec 1998
Volume 26, Issue 3 - Sep 1998
Volume 26, Issue 2 - Jun 1998
Volume 26, Issue 1 - Mar 1998
Selecting the target year
Influence of Earlywood, Latewood, and Nail Driving Position on Nail Withdrawal Load Behavior
Cha, Jae-Kyung ;
Journal of the Korean Wood Science and Technology, volume 26, issue 2, 1998, Pages 1~5
Nail withdrawal tests were conducted on clear wood of radiata pine. Nails were driven into the earlywood and latewood zones of each specimen, and nail withdrawal tests were then performed. Nail withdrawal loads were strongly dependent on earlywood and latewood and on nail position. The average load values for nail withdrawal in both the tangential and longitudinal directions were higher for latewood than for earlywood. Linear and nonlinear regression analyses of nail withdrawal load with specific gravity showed no discernible differences. Good correlations were obtained between nail withdrawal load and specific gravity.
Some Physical and Chemical Properties of Carbonized Wood Wastes(II)
Kim, Byung-Ro ; Mishiro, Akiyoshi ;
Journal of the Korean Wood Science and Technology, volume 26, issue 2, 1998, Pages 6~15
A total of forty five-ply, 30- by 30-cm lauan and larch plywood sheets were manufactured in the laboratory using commercial urea and phenol resin adhesives; half of these sheets were treated with fresh concrete. Each sheet was carbonized for 2, 4, and 6hours at
, respectively, and their physical properties were measured. The yie1d of charcoal decreased as carbonization temperature and time increased. Charcoal yield was greater in plywood than in veneer, and slightly greater in plywood treated with concrete compared to untreated plywood. Plywood manufactured with phenol resin adhesive had higher pH, higher equilibrium moisture content (EMC), and greater adsorption of methylene-blue dye compared to plywood manufactured with urea resin. For concrete-treated plywood, pH was greater than 10 even when the sheets were carbonized for 2hours at
. Although the EMC of the phenol resin plywood was higher than that of the urea resin plywood, EMC of the phenol resin was lower than that of the urea resin. The larch phenol resin plywood that was carbonized for 6 hours at
adsorbed more methylene-blue than did the commercia1 wood-based activated charcoal as a result of total pore volume and surface area.
Effects of Length and Grade on In-grade Tensile Strength and Stiffness Properties of Radiata Pine Timber
Tsehaye, Addis ; Buchanan, A.H. ; Cha, Jae-Kyung ;
Journal of the Korean Wood Science and Technology, volume 26, issue 2, 1998, Pages 16~23
This paper examines the effects of specimen length and grade on the strength and stiffness properties of structural timber of radiata pine. The tensile strength and modulus of elasticity of 1,902 machine-graded boards with 3.15- and 1.62-m clear span lengths, were determined using a horizontal tension test machine. The mean failure and characteristic stress values for tensile strength show an extremely high dependency on test specimen length. The mean and characteristic values of both modulus of elasticity and tensile strength show significant dependency on machine stress grades.
Perforated Ray Cells in Korean Celastraceae and Oleaceae
Eom, Young-Geun ; Chung, Youn-Jib ;
Journal of the Korean Wood Science and Technology, volume 26, issue 2, 1998, Pages 24~28
Ray cells with perforations are recorded for the first time in the Korean Celastraceae species of Euonymus sieboldiana and Tripterygium regelii and the Oleaceae species of Abeliophyllum distichum, Forsythia ovata, Ligustrum japonicum, and Osmanthus heterophylla, All these anomalous ray cells have simple perforations, and the vessel elements of all these species have simple perforation plates, Thus, in the Korean Celastraceae and Oleaceae, the perforations of ray cells appear to be identical with the types of perforation plates in the vessel elements of the same wood, The diagnostic value of the perforated ray cells is also discussed.
Development and Application of Image Analysis Program for Investigation of Pore Characteristics in Transverse Surface of Hardwoods
Kwon, Oh-Kyung ; Lee, Phil-Woo ;
Journal of the Korean Wood Science and Technology, volume 26, issue 2, 1998, Pages 29~37
An image analysis program with the function of measuring various quantitative characteristics in the transverse surface of wood was developed using Delphi 2.0. Data on pore characteristics (conditions for image processing, proportion of pores in relationship to other elements, tangential diameter, area, tangential and radial diameter, x and y coordinates of pore center, and geometric coefficients) were saved in text file format. In addition, the pore area histogram in the tangential and radial directions was saved as a BMP (bitmap) type file. Analyses indicated that quantitative characteristics such as the relative radial distribution of pores in a growth ring, pore tangential area histogram, and proportion of pore in lumen area appear to be useful in separating four diffuse-porous woods and four ring-porous woods on the species level.
Development and Evaluation of Turbulent Air Mixing Process for Manufacturing Wood Fiber and Thermoplastic Fiber Composites
Yoon, Hyoung-Un ; Eom, Young-Geun ; Park, Jong-Young ; Kong, Young-To ;
Journal of the Korean Wood Science and Technology, volume 26, issue 2, 1998, Pages 38~44
A new device that uses turbulent air for mixing wood fibers with thermoplastic fibers was designed and its mixing effectiveness was evaluated in wood fiber and polypropylene fiber composites. Composites made by the turbulent air mixing (TAM) process performed better than composites made by the conventional Rando-Webber forming or nonwoven web process with an additional needling step. Thus, the TAM process proved to be a simple and efficient method in mixing wood fibers with short thermoplastic fibers for the production of wood fiber and thermoplastic fiber composites.
Studies on Variability of Wood Properties in Stem of Pinus koraiensis (II) - Differences in Tracheid Length, Microfibril Angle, and Compression Strength in South and North Sides of Stem -
Kim, Byung-Ro ; Mishiro, Akiyoshi ;
Journal of the Korean Wood Science and Technology, volume 26, issue 2, 1998, Pages 45~50
Tracheid length, microfibril angle, and compression strength were examined in south and north sides of Pinus koraiensis. The sample tree was 57 years old and had been planted in central Korea. Tracheid length on the south side of the tree ranged from 2.87 to 3.40mm and on the north ranged from 3.60 to 3.53mm and mean values were 3.15 mm for the south and 3.26mm for the north. Tracheid length was 0.11 mm longer on the north side than on the south. Microfibril angle on the south side ranged from
and that on the north from
; mean values were
on the south side and
on the north. Microfibril angle was
greater on the south side than on the north side. For compression strength on the south and north sides, significant difference at the 95% level was found only at l.3m above the ground level of the sample tree; for compression limit stress, significant difference at this level was found at 1.3 and 5.3m above the ground level. However, compression strength and compression limit stress were greater on the north side than on the south side.
FTIR Spectroscopic Analysis of Structural Changes of Cellulosic Fibres During Papermaking Process
Kim, Hyoung-Jin ;
Journal of the Korean Wood Science and Technology, volume 26, issue 2, 1998, Pages 51~58
Structural changes of cellulosic fibres during the papermaking process were studied by analysis of FTIR spectra collected by the transmission method. The spectra were obtained from a carefully prepared handsheet, using a special infra-red (IR) cell suitable for evacuating the sample. The deconvolution technique was also applied for sharpening the FTIR spectra in the frequency range of the OH and CH stretching bands, which gave detailed information on the structural changes of cellulose. The intensity of some bands was decreased by predrying the sample as a result of the removal of adsorbed moisture. An increase in intensity of some bands in the frequency range of 3700 to
was shown at a higher beating level. This increase in intensity was caused by changes in the crystal domain of cellulose resulting from the exposure of the crystalline area on the fibre surface.