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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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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 36, Issue 6 - Nov 2008
Volume 36, Issue 5 - Sep 2008
Volume 36, Issue 3 - May 2008
Volume 36, Issue 2 - Apr 2008
Volume 36, Issue 4 - Apr 2008
Volume 36, Issue 1 - Jan 2008
Selecting the target year
Ignition and Heat Release Rate of Wood-based Materials in Cone Calorimeter Tests
Park, Joo-Saeng ; Lee, Jun-Jae ;
Journal of the Korean Wood Science and Technology, volume 36, issue 2, 2008, Pages 1~8
This study was performed to evaluate the burning characteristics of wood-based materials and the effectof surface treatment of fire retardant using cone calorimeter. Four types of wood-based materials, such asPlywood, Oriented Strand Board (OSB), Particle Board (PB) and Medium Density Fiberboard (MDF), weretested at a constant heat flux of 50 kW/rnU to investigate the time to ignition, mass loss rate, heat releaserate, effective heat of combustion, etc. In addition, each type of wood-based material was tested at theburning characteristics. The surface treatment of fire retardant, by the amount of 110 g/mU, delayed the time to ignition almost twice. However, it was indicated that heat release rate, mass loss rate, and effectiveheat of combustion were not significantly affected by fire retardants treatment for all types of wood-basedmaterials.
Anatomical Comparison of North American Eastern, Southern, and Western Redcedar Wood
Eom, Young-Geun ; Kwon, Oh-Kyung ; Hanna, Robert B. ; Meyer, Robert W. ;
Journal of the Korean Wood Science and Technology, volume 36, issue 2, 2008, Pages 9~20
Anatomical comparison of 3 North American species with commercial name of redcedar was executedto provide taxonomic information for prevention of confusion and establishment of sound business trans-action in the wood market. Eastem redcedar (Juniperus virginiana) and southern redcedar (Juniperus sitici-cola) could not be separated on the basis of microstructure and ultrastructure of wood. Westem redcedar(Thuja pticatd), however, appeared to be obviously separated from eastern and southern redcedar in a num-ber of microscopic and ultramicroscopic features. Useful features for separating these two groups were in-tercellular spaces in transverse surface, latewood width, radial intertracheid pitting, warty layer and pitswith torus extensions in tracheids, ray composition, nodular end walls in ray parenchyma cells, andcross-field pitting.
Investigation of Radial Distributions of Tangential Strains and of Moisture Contents within a Log Cross Section by Circumferential Slices
Choi, Jun-Ho ; Lee, Nam-Ho ;
Journal of the Korean Wood Science and Technology, volume 36, issue 2, 2008, Pages 20~28
This study was carried out to provide the so-called circumferential slicing method for investigating radialdistributions of the tangential strains and of moisture contents within the log cross section (LC) ofKatopanax pictus during indoor drying it. While the heartwood showed an almost uniform moisture contentdistribution in the range of about 50-55% in case of the green wood, it has gradually decreased towardthe outer side, showing about 19% of moisture content difference from the innennost slice. Although themoisture gradient along the radial direction has gradually become gentle as drying progresses, the sapwoodof the outer side represented the moisture contents below the fiber saturation point after 24 hours of dryingwhile the heartwood in the inner part showed the moisture contents higher than the fiber saturation point.The pith side was laid under the tensile stress after 24 hours of drying, and then gradually decreasing to-ward the bark side, and showed the distribution being switched again to the tensile stress on the bark side.As the drying has progressed, this trend got more intensified, and finally showed the U-shaped distributionmodel after 48 hours of drying. The circumferential slice test is considered to be suitable in quantitativelydetermining the tangential strains and moisture content within a LC.
Evaluation of the Strength Properties of Glulam Connections with Inserted Steel Plates and Drift Pins
Kim, Ho-Ki ; Park, Chun-Young ; Lee, Jun-Jae ;
Journal of the Korean Wood Science and Technology, volume 36, issue 2, 2008, Pages 29~38
It is well-known that the strength properties of wood connections depend on the density of the woodmembers, the diameter of the fasteners, the number of fasteners, and the arrangement of the fasteners, etc.In this study, the connection with inserted steel plates and drift pins was made in different configurations.The specimens were Larch and Sugi glulam connections. The specimens were loaded in tension, and theyield loads of the connections were obtained. The values obtained from the tests were compared with thepredicted values. Good agreement between the yield loads obtained from the tension failure tests and thepredicted yield loads were shown, It was shown that the density of the wood member barely affected thestrength properties of the connections. The strength decreases of the Sugi glulam connections by the groupeffect were less than those of the Larch glulam connections.
Influence of Surface Finishing Material Types to Formaldehyde and Volatile Organic Compounds Emission from Plywood
Kim, Ki-Wook ; Oh, Jin-Kyoung ; Lee, Byoung-Ho ; Kim, Hyun-Joong ; Lee, Young-Kyu ; Kim, Sung-Hun ; Kim, Gwan-Eui ;
Journal of the Korean Wood Science and Technology, volume 36, issue 2, 2008, Pages 39~45
formaldehyde and volatile organic compounds (VOCs) are emitted from wood-based panels that havebeen made using wood particles, wood fiber, wood chips, formaldehyde-based resins and so on. In thisstudy, we examined formaldehyde and total VOCs (TVOC) emission behaviors for plywood overlaid withwater-soluble phenolic resin impregnated linerboard (PL), and two kinds of surface materials (decorativeveneer and pre-impregnated finishing foil) that were adhered onto the PL that named DPL and PPL. EVA(ethyl vinyl acetate) was used to overlay the decorative veneer and pre-impregnated fmishing foil on theplywood with water-soluble phenolic resin impregnated Imerboard by a hot press instrument. The debond-ing test and accelerated aging test were conducted to assess their mechanical properties. Formaldehyde andTVOC emission concentrations were measured using the FLEC method and a VOC Analyzer, respectively.The debonding test results of PL, DPL and PPL were 1.2, 1.5, and 0.5 N/mmU respectively. The surfaceappearance of the samples were not changed after the accelerated aging test. The PL and DPL exhibitedreduced formaldehyde and TVOC emission levels, respectively. In the case of PPL, the VOC value wasrelatively higher than those of PL and DPL.
Formaldehyde and TVOC Emission of Bio-Composites with Attached Fancy Veneer
Lee, Byoung-Ho ; Kim, Hee-Soo ; Kim, Ki-Wook ; Lee, Se-Na ; Kim, Hyun-Joong ;
Journal of the Korean Wood Science and Technology, volume 36, issue 2, 2008, Pages 46~55
This study assesses the formaldehyde and TVOC emissions from bio-composites with attached fancy ve-neer manufactured using: wood flour and polypropylene (PP) measured using the Field and LaboratoryEmission Cell (FLEC) method and 20 L small chamber method. To determine and compare the effectsof the adhesive, samples; were prepared with different manufacturing methods, In the FLEC result, theformaldehyde emission lefvel of the bio-composites with attached veneer by hot-press was the lowest thanpure bio-composite and bjo-composite attached veneer using adhesive. The TVOC emission levels are sim-ilar to the formaldehyde ernission. The TVOC emission level is very low in all of the samples except fancyveneer that is attached with bio-composites using adhesive. The TVOC emission varies depending on howattaching fancy veneer. The results of the 20 L small chamber method were very similar to those obtainedwith the FLEC, but the <|orre1ation was not perfect. However, the FLEC method requires a shorter timethan the 20 L small chajnber method to measure the formaldehyde and TVOC emissions. The intemalbonding strength exceedeO the minimum value of 0.4 N/mmU specified by the K.S standard. All of thebio-composites with attached veneer satisfied the K.S standard.
Characteristics of Surface Strand Orientation and Strand Mat Thickness Variation and Its Effect on the Bending Properties of Commercial OSB
Oh, Sei-Chang ;
Journal of the Korean Wood Science and Technology, volume 36, issue 2, 2008, Pages 56~62
The surface and edge structure of OSB is defined by surface strand orientation and strand mat thicknessvariation parallel to the length of the panel using video-microscope. The bending strength of OSB wascorrelated with surface strand orientation and decreased with increasing the orientation angle in the direc-tion parallel to length of the panel. Average strand mat thickness variation parallel to the length of thepanel did not influence the bending strength, but the bonding characteristics among the outermost strandsaffects the bending strength of OSB. Hankinson formula can be used to predicts the MOE according tostrand orientation in the surface of OSB, and more precise strand alignment and reducing thickness varia-tion should be important in the structural performance of OSB panels.
C-NMR Spectroscopy of Urea-Formaldehyde Resin Adhesives with Different Formaldehyde/Urea Mole Ratios
Park, Byung-Dae ; Lee, Sang M. ; Park, Jong-Young ;
Journal of the Korean Wood Science and Technology, volume 36, issue 2, 2008, Pages 63~72
As a part of abating formaldehyde emission of urea-formaldehyde (UF) resin adhesive, this study wasconducted to investigate chemical structures of UF resin adhesives with different formaldehyde/urea (F/U)mole ratios, using carbon-lS nuclear magnetic resonance ("C-NMR) spectroscopy. UF resin adhesives weresynthesized at four different F/U mole ratios such as 1.6, 1.4, 1.2, and 1.0 for the analysis. The analysisof 'UC-NMR spectroscopy showed that UF resin adhesives with higher F/U mole ratios (i.e., 1.6 and 1.4)had two distinctive peaks, indicating the presence of dimethylene ether linkages and methylene glycols,a dissolved form of free formaldehyde. But, these peaks were not detected at the UF resins with lowerF/U mole ratios (i.e., 1.2 and 1.0). These chemical structures present at the UF resins with higher F/Umole ratios indicated that UF resin adhesive with higher F/U mole ratio had a greater contribution to theformaldehyde emission than that of lower FAJ mole ratio. Uronic species were detected for all UF resinsregardless of F/U mole ratios.
Manufacture and Properties of Inorganic Chemical Treated Wood by Introducing of Fluorides
Kim, Soung-Joon ; Lee, Jong-Shin ;
Journal of the Korean Wood Science and Technology, volume 36, issue 2, 2008, Pages 73~78
Inorganic chemical treated wood was prepared by impregnation of calcium or magnesium chloride(CaClz or MgClz) solution and immersion in saturated solution of ammonium fluoride (NR,F) as a reactanlin order to make an introduction of a refractory fluorides with fungicidal and insecticidal effects in wood.The weight percent gains (WPGs) were increased with increase in concentration of calcium chloride ormagnesium chloride solution, and were higher in treatment with calcium chloride than with magnesiumchloride, Inorganic substances were produced mainly in the lumina of tracheides. These substances wereproved to be the calcium fluoride or magnesium fluohde by the energy dispersive X-ray analyzer in con-junction with a scanning electron microscope (SEM-EDX).The treated wood showed good decay resistance because the weight losses were hardly occurred by thetest fungi such as Tyromyces patustris and Trametes versicotor. The fire resistance effect was superior tothe treated wood compared with that of the untreated wood.