Go to the main menu
Skip to content
Go to bottom
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 39, Issue 6 - Nov 2011
Volume 39, Issue 5 - Sep 2011
Volume 39, Issue 4 - Jul 2011
Volume 39, Issue 3 - May 2011
Volume 39, Issue 2 - Mar 2011
Volume 39, Issue 1 - Jan 2011
Selecting the target year
Investigation of the Effect of Organoclay Additives on Mechanical Properties of PF resin and MPB-OSL using Creep Behavior Analysis and IB Test
Kim, Yong-Sik ; Kadla, John F. ;
Journal of the Korean Wood Science and Technology, volume 39, issue 5, 2011, Pages 381~389
DOI : 10.5658/WOOD.2011.39.5.381
The effect of organoclays on the mechanical properties of cured phenol formaldehyde resin and oriented strand lumber made from Mountain Pine Beetle killed pine strands was analyzed. Three organoclays were used: a natural montmorillonite, hydrophobic organically modified 10 A, and hydrophilic organically modified 30 B. The oriented strand lumber samples were less creep deformation as well as improved internal bonding strength by adding organoclays in the order of 10 A 2% > MMT 2% > 30 B 2% > control. Furthermore, time-temperature superposition (TTS) analysis was proved to be able to predict the long-term creep behavior of MPB-OSL samples.
Study on the Evaluation of Performance for Pitch Pine Round Timbers as Safety Barrier Beam Members
Lim, Jin-Ah ; Yeo, Hwan-Myeong ; Lee, Jun-Jae ;
Journal of the Korean Wood Science and Technology, volume 39, issue 5, 2011, Pages 390~397
DOI : 10.5658/WOOD.2011.39.5.390
In this study, bending test was conducted as beam members in timber roadside safety barrier. The flexural properties of pitch pine round timber according to the diameters were evaluated. And then grading based on the growth characteristics applied to choosing the pitch pine round timbers which is met the criteria of guideline (Japan, 2008). MOR of round timber 160 mm is higher than other specimens from 100 mm to 140 mm. Because of lower juvenile wood ratio and higher density. The MOE of round timber is decreased according to the increment of diameter. Only 32% of the specimens has passed the limitations. Performance of pitch pine round timbers has confirmed to suitability roadside safety beam members according to the guideline (Japan, 2008).
Nondestructive Bending Strength Evaluation of Woodceramics Made from Woody Part of Broussonetia Kazinoki Sieb. - Effect of Resin Impregnation Ratio -
Byeon, Hee-Seop ; Kim, Jae-Min ; Won, Kyung-Rok ; Oh, Seung-Won ;
Journal of the Korean Wood Science and Technology, volume 39, issue 5, 2011, Pages 398~405
DOI : 10.5658/WOOD.2011.39.5.398
Nondestructive evaluation (NDE) technique method using a resonance frequency mode was carried out for woodceramics made by different phenol resin impregnation ratios (40, 50, 60, 70%) for Broussonetia Kazinoki Sieb. Dynamic modulus of elasticity increased with increasing resin impregnation ratios. There was a close relationship between dynamic modulus of elasticity and static bending modulus of elasticity and between dynamic modulus of elasticity and MOR and between static bending modulus of elasticity and MOR. Therefore, the dynamic modulus of elasticity using resonance frequency mode is useful as a nondestructive evaluation method for predicting the MOR of woodceramics made by different impregnation ratios.
Comparative Wood Anatomy of Stem and Root in Korean-grown Yellow-poplar (Liriodendron tulipipfera L.)
Lee, Mi-Rim ; Eom, Young-Geun ;
Journal of the Korean Wood Science and Technology, volume 39, issue 5, 2011, Pages 406~419
DOI : 10.5658/WOOD.2011.39.5.406
This study was carried out to offer basic information on the wood anatomy of domestic yellow-poplar (Liriodendron tulipifera L.), a new plantation species selected by Korea Forest Service as one of the promising hardwood and bioenergy sources of the future, through comparison of stem wood with root wood in the qualitative and quantitative features. In the qualitative anatomical features, growth rings were distinct in stem wood but relatively less distinct in root wood. And stem wood appeared to have pores in radial multiples of 2 to 5, sometimes clusters but root wood to have pores in radial multiples of 2 to 3, rarely clusters. And numbers of bars in scalariform perforation plates were somewhat numerous in vessel elements of root wood than in those of stem wood. Interestingly, on the other hand, more extraneous materials in the wood rays of tap root than in those of lateral root and stem were confirmed in the chemical composition analyses. In the quantitative anatomical features, pore densities were significantly greater but vessel elements were considerably narrower in stem wood than in root wood. Vessel elements and wood fibers of root wood were considerably longer than those of stem wood. Rays were somewhat more numerous in stem wood than in root wood, and only ray heights of stem wood were more or less greater in cell numbers but both ray heights and widths of stem wood were lower in dimension than those of root wood. The anatomical differences between stem wood and root wood were thought to be associated with different growth environments between the stem above ground and the root below ground.
Distribution of Hemicelluloses in Warts and the Warty Layer in Normal and Compression Wood Tracheids of Cryptomeria Japonica
Kim, Jong-Sik ; Awano, Tatsuya ; Yoshinaga, Arata ; Takabe, Keiji ;
Journal of the Korean Wood Science and Technology, volume 39, issue 5, 2011, Pages 420~428
DOI : 10.5658/WOOD.2011.39.5.420
The distribution of arabino-4-O-methylglucuronoxylans (AGXs) and O-acetyl-galactoglucomannans (GGMs) in warts and the warty layer of tracheids in normal wood (NW) and compression wood (CW) of Cryptomeria japonica was investigated. Under field emission scanning electron microscope (FE-SEM) observation, warts and the warty layer of delignified NW and CW tracheids were degraded by xylanase treatment, indicating that warts and the warty layer contain high amounts of AGXs. However, the effect of xylanase was not observed in NW and CW tracheids before delignification, suggesting that AGXs in warts and the warty layer may be encrusted with lignin. After
-mannanase treatment, no noticeable changes were observed in warts and the warty layer of NW tracheids, indicating that warts and the warty layer contain either no or very few GGMs. Similar results to FE-SEM observations were also observed with immunogold labeling. AGX labeling was observed in warts and the warty layer of NW and CW tracheids, while GGM labeling was not detected. NW tracheids showed a much stronger density of AGX labeling than did CW tracheids in warts and the warty layer, indicating differences in the chemical compositions of warts and the warty layer between NW and CW tracheids.
Evaluation of Physical and Mechanical Properties of Non-certificated Laminated Veneer Lumber (LVL) Circulated in Domestic Lumber Market
Oh, Sei-Chang ;
Journal of the Korean Wood Science and Technology, volume 39, issue 5, 2011, Pages 429~436
DOI : 10.5658/WOOD.2011.39.5.429
The selected physical and mechanical properties of non-certificated LVL circulated in domestic lumber market were investigated and compared to relevant standards. The tested LVL passed the moisture content and the soaking delamination rate limit as per domestic (KS) and Japanese standard (JAS). The evaluated mechanical properties were flatwise/edgewise bending strength, modulus of elasticity (MOE), horizontal shear and compressive strength. The 30 mm-thick LVL showed significantly higher bending strength than that of the 25 mm-thick LVL. The modulus of elasticity (MOE) showed same tendency in the results of bending strength. The edgewise bending strength and MOE were higher than that of flatwise bending strength and MOE. The horizontal shear strength values were also showed similar results to bending strength values. The tested results were compared each other and each products were graded according to JAS 701 grade specification. The failure mode of LVL in bending test showed the similar failure mode of solidwood that failed in a simple tension manner (splintery tension). The glue line failure was severe in 25 mm-thick specimens due to concentration of shear stress in layer discontinuity containing small voids and starved glue lines. In horizontal shear strength test, failure mode of LVL showed the typical horizontal shear failure. Compressive specimens failed with fiber crushing in company with apparent delamination that splitted along the length of the specimens. From the results, the complete bonding between lamination and consistency in thin veneer layer were considered as a critical factor in the mechanical properties of LVL. Moreover, the standard test procedure and specification for non-certificated LVL should be required to check the performance of uncertificated materials.
Evaluation of Friction Properties According to Normal Force and Direction of Wood Grain in Real Contact Area
Park, Chun-Young ; Kim, Chul-Ki ; Kim, Hyung-Kun ; Lee, Jun-Jae ;
Journal of the Korean Wood Science and Technology, volume 39, issue 5, 2011, Pages 437~443
DOI : 10.5658/WOOD.2011.39.5.437
In Korea, there has been a traditional post and beam wood construction with large roof load. Because a large friction is generated in wooden joint or members, it is important to evaluate the friction between wood members according to wood direction. Because most of studies have been concerned with friction between wood and steel, excluding effect of real area of contact, there are a few studies on the friction between wood members. The object of this study was to evaluate friction or coefficient of friction according to normal force and real area of contact of wood. With Japanese larch (Larix kaempferi) test specimens, five steps of normal force and combinations of test were prepared. Results indicated that normal force had almost no affection on the friction, however there was difference about friction or coefficient of friction according to real contact conditions of wood grain and contact area.
Bending Strength of Korean Softwood Species for 120×180 mm Structural Members
Pang, Sung-Jun ; Park, Joo-Saeng ; Hwang, Kweon-Hwan ; Jeong, Gi-Young ; Park, Moon-Jae ; Lee, Jun-Jae ;
Journal of the Korean Wood Science and Technology, volume 39, issue 5, 2011, Pages 444~450
DOI : 10.5658/WOOD.2011.39.5.444
The goal of this study is to investigate bending properties of domestic timber. Three representative structural timber from Larix kaempferi, Pinus koraiensis, and Pinus densiflora, in the northeastern South Korea were selected. Visual grading for the timber was conducted based on KFRI notification 2009-01 and the bending strength for the timber was evaluated based on ASTM D 198 bending. The high percentage of grade 1 and 2 for Larix kaempferi shows that the KFRI notification was optimized for this species. The bending strength distributions from Pinus koraiensis and Pinus densiflora were very similar. It could be possible to specify the allowable bending properties of these two Specification using a united species group similar to spruce-pine-fir. Lastly, the bending strength of
structural members was higher than both existing values in KBC 2009 and design values for timber of imported species described in the NDS. Thus, 120 mm thick domestic softwoods could replace the commercial imported species and the KBC should be modified to provide design values for both timber and dimensional lumber, respectively, like NDS.
Preliminary Study of Rapeseed Flour-based Wood Adhesives for Making Wood Flooring
Yang, In ; Ahn, Sye-Hee ; Choi, In-Gyu ; Han, Gyu-Seong ; Oh, Sei-Chang ;
Journal of the Korean Wood Science and Technology, volume 39, issue 5, 2011, Pages 451~458
DOI : 10.5658/WOOD.2011.39.5.451
Adhesives derived from renewable resources allow wood panel producers to make lower cost alternatives to formaldehyde-based adhesive resins. Among them, adhesive components extracted from industrial by-products or wastes are the most important research fields in the efficient utilization of waste and cost reduction. In our study, the rapeseed flour, which is a by product from the production of biodiesel extracted from rapeseed, was introduced to develop alternative adhesives for the production of wood flooring. The rapeseed flour was hydrolyzed with 1% sodium hydroxide solution and PF prepolymers were prepared with 3-molar ratios, 1.8, 2.1 and 2.4. The linear fracture mechanics was introduced to evaluate the glue bond quality in wood flooring composed of fancy-veneered and plywood, and the formaldehyde emission and adhesive penetration were also investigated. The formaldehyde emissions of wood flooring met the requirement of the standard of
specified in the KS standard. The rapeseed flour adhesive penetrated sufficiently into the vessel elements and lumens in fancy veneer and plywood and gave strong bond quality to the wood flooring. The fracture mechanics was introduced to evaluate the adhesive joint between fancy veneer and plywood. The critical stress intensity factor (
) of boliva overlayed wood flooring was increased with increasing molar ratio and this was the same tendency in oak overlayed wood flooring. From the results, the formulated adhesives were efficiently used to bond fancy veneer onto the plywood to make wood flooring and showed a potential to be used as a component of environmentally friendly adhesive resin systems for production of flooring.