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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 20, Issue 4 - Dec 1992
Volume 20, Issue 3 - Sep 1992
Volume 20, Issue 2 - Jun 1992
Volume 20, Issue 1 - Mar 1992
Selecting the target year
Bacterial Cellulose -The Possibility of Raw Material for Paper Making Fiber-
Kuga, Shigenori ;
Journal of the Korean Wood Science and Technology, volume 20, issue 2, 1992, Pages 3~8
Physical and Mechanical Properties of Panels Fabricated with Particle and Fiber by Composition Types
Yoon, Hyoung-Un ; Lee, Phil-Woo ;
Journal of the Korean Wood Science and Technology, volume 20, issue 2, 1992, Pages 9~22
The aim of this research was to investigate physical and mechanical properties of various composition panels, each fabricated with a ratio of fiber to particle of 2 to 10. Type A consisted of fiber-faces and particle-core in layered-mat system. Type B consisted of fiberboard-faces on particleboard-core. Type C consisted of fibers and particles in mixed-mat system. The results obtained from tests of bending strength, internal bond, screw holding strength and stability were as follows: 1. The bending strength and internal bonding of both the Type A panel and the Type B panel were higher than those of the Type C panel and three-layered particle board. 2. The mechanical properties of the Type C panel showed the lowest values of all composition methods. It seems that the different compression ratios of the particle and fiber interrupted the densification of the fibers when hot pressed. 3. The dimensional stability of layered-mat system panels consising of fiber-faces and particle-core was better the than control particleboard. 4. In composition methods of particle and fiber, layered-composition method was more resonable than mixed-composition. The Type B panel had the highest mechanical properties of all the composition types. 5. The Type A panel was considered the ideal composition method because of its resistance to delamination between the particle-layer and the fiber-layer and because of its lower adhesive content and more effective manufa cturing process.
A Study on the automation of external collector type solar-dehumidification drying of wood using a personal computer
Lee, Hyoung-Woo ;
Journal of the Korean Wood Science and Technology, volume 20, issue 2, 1992, Pages 23~30
An experimental external external collector type, solar dehumidification dryer was retrofitted with a simple computer-based control system. Solar, solar-dehumidification, and air-drying of 3cm-thick douglas-fir were carried out to investigate the drying-conditions and characteristics of this system, and to analyze the energy efficiencies of each drying met hods in summer. The drying rate of solar-dehumidification was 12%/day, which was about 2 times and 3 times faster than that of solar-and air-drying, respectively. The amount of diurnal temperature fluctuation inside the solar-dryer was greatly reduced and the energy efficiency was enhanced from 25% to 60% by the dehumidifier.
Effects of Antimony Trioxide-containing Coating on Fire Retardancy of Wood-based Materials
Yun, Young-Ki ; Lee, Phil-Woo ;
Journal of the Korean Wood Science and Technology, volume 20, issue 2, 1992, Pages 31~42
In this study, the relative effectiveness of antimony trioxide-containing coat on fire retardancy of plywood, particleboard and medium density fiberboard was investigated and compared through ISO ignition test and inclined panel test with non-coated ones. The results obtained were summarized as fallows: Any treated materials was not ignited in inclined panel test with 5 minutes, but only particleboard among treated ones burned in ISO ignition test with fairly delayed time. The weight loss rate of plywood decreased with the increased addition level of fire-retardant and the least values were obtained in particleboard and MDF at addition level of 7% and 5% respectively. Carbonized area of wood based materials decreased with the increased addition level of fire retardant. The temperatures of back in plywood, particleboard treated with fire-retard ant coat containing 7%
showed the lowest but MDF did not show any effectiveness with the increased addition level. The first flash time of plywood treated with fire retardant coat containing 9%
, MDF and particleboard treated with fire retardant coat containing 7%
were 257sec., 286.4sec., 165.4sec. respectively.
A Study on the Development of Hwaseonji from Bamboo Pulp
Cheon, Cheol ;
Journal of the Korean Wood Science and Technology, volume 20, issue 2, 1992, Pages 43~50
This study was carried out to investgate the possiblity of using waste bamboo and bast fiber from paper mulberry for Hwaseonji production. 3 types of Hwaseonji were made in an experimental system, 100% bamboo pulp, bamboo pulp mixed with bast fiber in two different ratios, 70% : 30% and 40% : 60%, respectively. The result were as follows: 1. The chinese ink blots of Hwaseonji made from bamboo pulp only was satisfactory, but its tensile strength showed a low value. In order to improve the tensile strength, we must develope a new beating method with musilige. 2. The burst strength increased as the bast fiber content increased. But it is a special characteristic of Hwaseonji, that an even formation of paper is required. Therefore, only the short bast fiber is needed. 3. The tensile strength was raised by increasing the bast fiber content to 60%, resulting in a more durable Hwaseonji. 4. In even thickness, the higher opacity showed the more bast fiber. So the opacity of product III (bamboo: 40%, bast fiber: 60%) is the highest. 5. The commodity value of hand-made paper should be grade-up after a dedusting process.
High-temperature Drying of Southern Pine Lumber by Green sorting
So, Won-Tek ; Taylor, Fred W. ;
Journal of the Korean Wood Science and Technology, volume 20, issue 2, 1992, Pages 51~60
This study was performed to investigate the effect of green sorting before drying on the high-temperature drying characteristics of southern yellow pine dimension lumber(2"
12'). To test the advantages of weight sorting, green lumber was seperated into heavy(above 55 1b), medium(50-55 1b), and light(below 50 1b)weight classes. Pieces in each weight class were subgrouped into high(above 35%) and low(below 30%) latewood groups. Groups were dried and seperated by a standard commercial high-temperature schedule; dry bulb temperature
F, wet bulb temperature
F, and air velocity 1200fpm. The results obtained were as follows; 1. There was a highly significant correlation between annual rings per inch(X) and percent-latewood(Y). The regression equation was Y=24, 5047+1.3272X. 2. There were highly significant correlations between either annual rings per inch(
) or percent-latewood(
) a.d specific gravity in green wood(Y). Their regression equations were Y=0.4260+0.0081
, respectively. 3. Heavier weight charges dried more slowly than lighter weight charges. 4. Board-to-board variation in green or dry moisture content was less for all seperate weight classes than for unseperated control charges. 5. Lower latewood pieces had higher initial moisture content than higher latewood pieces, and then drying time for lower late wood pieces was longer than higher latewood pieces.
Studies on Fracture Criterion in Yellow Lauan(Shorea spp.) under Mode I, Mode II and Mixed Mode Loading
Shim, Kug-Bo ; Lee, Jun-Jae ; Jung, Hee-Suk ;
Journal of the Korean Wood Science and Technology, volume 20, issue 2, 1992, Pages 61~72
This study was carried out to investigate the fracture behavior and the fracture criterion of yellow lauan(Shorea spp.), when has used for furniture and wood structures, and to offer a reliability for wood structure and basic data for wood fracture criterion in experiments which are fracture tested under mode I, mode II and mixed mode loading condition. The results were summarized as follows; 1. Fractures in specimens which have inclined grain in yellow lauan procedeed from crack tip in the radial direction along the grain. 2. In yellow lauan,
. 3. The fracture criteria of lauan were; (
)=1 in RL system with inclined grain at
=1 with inclined grain at
=1 with inclined grain at
, respectively. 4. The fracture criterion of wood could vary with the species, and the load applying condition. In order to measure the fracture criterion strictly, along with standardization of specimen geometry a large amount of experimental data is needed. 5.
(critical stress intensity factor) can be predicted by grain angle. As the grain inclined angle increased,
Presteaming Effect on Properties of Native Oak Lumber
Kang, Ho-Yang ;
Journal of the Korean Wood Science and Technology, volume 20, issue 2, 1992, Pages 73~80
The effect of presteaming on native oak specimens(Quercus serrata) of 2.5cm thick were investigated by measuring specific gravities, internal moisture gradients, residual extractives, and transport rates of free and bound water. The specific gravities and internal moisture gradients of the presteamed samples did not much deviate from those of the controls, but after presteaming discrepancy in moisture content between specimens lessened. The amount of residual hot-water extractives of the presteamed samples were less than those of the controls by 25%. The transport rates of bound water were determined by measuring steady-state diffusion coefficients with a vapormeter cup. After presteaming the diffusion coefficients in radial direction increased by 35%, but decreased those in the tangential direction.
Substitution Characteristics of Carboxymethyl cellulose made from Hydrocellulose
Choi, Won-Sil ; Ahn, Won-Yung ;
Journal of the Korean Wood Science and Technology, volume 20, issue 2, 1992, Pages 81~90
The effect of acid treatment of cellulose on the substitution charateristics of carboxymethylation was studied in this paper. Five samples of hydrocellulose(HC), all prepared from
-cellulose by hydrolysis with five reaction times and determined on average molecular weight and polydispersity, were carboxymethylated to carboxymethyl cellulose (CMC). The CMCs from HCs were examined upon degree of substitution(DS), distribution of carboxymethyl groups in anhydroglucose units of the cellulose, and unsubstituted anhydroglucose(USAG) content. The DS of CMCs increased with increasing the hydrolysis time except CMC from HC at 1 hour hydrolysis time. In carboxymethylation the availability of hydroxyl groups on anhydroglucose units in HCs was the highest on OH(2), and the relative availability of OH(6) increased with the increasing of the hydrolysis time. The USAG contents were more deviated than that calculated based on Spurlin's model, and had a strong tendency of decreasing with increasing the hydrolysis time. The reactivity of HC was lower than that of
-cellulose and the relative availability of OH(6) in HC increased with the hydrolysis time.
Wood Utilization and Extraneous Components
Choi, Choo-I-Boo ; Hwang, Byung-Ho ;
Journal of the Korean Wood Science and Technology, volume 20, issue 2, 1992, Pages 91~100
The 42nd Meeting of The Japan Wood Research Society -Research Aspects of Cellulose, Wood Structure and Wood Quality-
Kim, Nam-Hun ;
Journal of the Korean Wood Science and Technology, volume 20, issue 2, 1992, Pages 101~106