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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
한국(韓國) 목질(木質)보드산업(産業)의 원자재(原資材) 수급현황(需給現況)과 대책(對策)
Lee, Yung-Ki ;
Journal of the Korean Wood Science and Technology, volume 20, issue 3, 1992, Pages 7~10
Total Utilization of Woody Biomass by Steam Explosion(I) -Delignification of pine and oak exploded wood-
Lee, Jong-Yoon ; Chang, Jun-Pok ; Yang, Jae-Kyung ;
Journal of the Korean Wood Science and Technology, volume 20, issue 3, 1992, Pages 11~20
Steam explosion is one of the most effective pretreatment for fractionating wood. This leads to the total utilization of wood basic components; cellulose, hemicellulose and lignin. The amount of sugar and lignin extracted with the hot water method was very low. The lignin content of residues after extraction with using a sodium hydroxide treatment, increased delignification of carbohydrate as the concentration of alkali was increased. Oak, pretreated with steam exploded at 25kg/
for 6 min. then 1% alkali for 2hrs. showed a delignification rate up to 95%. A sodium chlorite treatment of steam exploded pine and oak also afforded a high deligninfication effect. Pine, treated 10% sodium chlorite for 2hrs. showed high delignification. However, by using a sodium hydroxide treatment, a 2% retreatment for Ihr. after a 2% for 2hrs. afforded remarkable delignification effect on exploded wood at 30kg/
for 9min. and at 35kg/
for 3-6min. In oak, an initial 2hrs. treatment of 2% sodium chlorite was followed by a second 2hrs. treatment at 10%. This showed a delignification rate of 96%.
Behavior of Moisture Transmission in Earlywood and Latewood for Cryptomeria japonica -Difference of Moisture Transmission Behavior and Calculation of the Vapor Permeability-
Lee, Weon-Hee ; Kim, Bung-Ro ;
Journal of the Korean Wood Science and Technology, volume 20, issue 3, 1992, Pages 21~27
The amount of moisture transmitted under four different humidity conditions was measured in earlywood and latewood for Cryptomeria japonica(LT specimens). The results obtained are summarized as follows. The vapor permeability in eariywood was about three times larger than that of latewood. The vapor permeabilities in earlywood and late wood depended on the average moisture content of the wood. This indicates that moisture transmission is influenced by vapor permeability or vapor-transmission resistance, but the values obtained by experiments do not have great adaptability for practical situations because of changes in the experimental conditions. There fore, it is necessary to know the moisture content along the flow direction in order to explain the moisture transmission of wood. The vapor permeability was calculated using the density in air dried wood. These were then compared with the experimental values. The vapor permeabilities calculated with this density in the radial direction(LR specimen) had a good tendency to agree with the experimental values, but not so in tangential direction(LT specimen).
Effects of Cyclic Humidification on Dimensional Stability of Particleboard and Com-Ply
Lee, Phil-Woo ; Kim, Dae-Jun ; Park, Hee-Jun ;
Journal of the Korean Wood Science and Technology, volume 20, issue 3, 1992, Pages 29~37
This research was carried out to investigate the effects of cyclic humidification on the dimensional stability of particleboard manufactured according the three specific gravity levels and com-ply fabricated with a core of particleboard and veneer or plywood as the face and back materials. Both the particleboard and com-ply were subjected to four cycles of 50-90-50% relative humidity. The results are summarized as follows: Particleboard and com-ply followed a clear pattern of increasing dimensions and weight on the adsorption cycle and decreasing dimensions and weight on the humidification cycle. After the fourth cycle, the dimensions and weight of both particleboard and com-ply were greater than those originally measured. The greater part of increase in occurred during the first humidification cycle. The specific gravity of particleboard has a significant effect thickness and volume change. The dimensional stability of com-ply was better than that of particleboard. In addition, the dimensional stability of com-ply bonded with plywood was better than that of com-ply bonded with veneer.
A Study on the Stresses causing the Bowing of Wooden Flush Doors for Furnitures and Buildings
Chung, Woo-Yang ;
Journal of the Korean Wood Science and Technology, volume 20, issue 3, 1992, Pages 39~54
Hollow core wood flush doors for wardrobes, and other general openings and bathroom were designed and fabricated to investigate the factors causing the bowing of them and to find out the countermeasure for the phenomena. Balance in grain orientation, thickness, specific gravity and M.C.(%) of face panel and symmetrical construction were the essential factors to prevent the deflection of flush doors just after manufacturing. Under one-sided severe service condition, the unbalance of M.C. between opposite face panels is inevitable. So the material as thick plywood with high stiffness is considered as an alternative for the stile. UF resin mixing into PVAc emulsion is preferred for bathroom.
X-Ray Diffractional and IR Spectral Characteristics in Brown-Rotted Woods Decayed by T. palustris and G. trabeum
Choi, Ji-Ho ; Han, Ok-Soo ; Kim, Yoon-Soo ;
Journal of the Korean Wood Science and Technology, volume 20, issue 3, 1992, Pages 55~60
Japanese red pine (Pinus densiflora S. et. Z.) decayed by brown-rot fungi Tyromyces palustris and Gloeophyllum trabeum were subjected to X-ray diffraction analysis and infrared spectral examinations. Pine woods decayed by T. palustris showed the increase of relative crystallinity in the initial stage of degradation. When the weight loss was above 30%, then the crystallinity went down slowly. In contrast, the wood samples degraded by G. trabeum showed the decrease of crystallinity from the beginning stage of decay. The changes of crystallinity in brown-rotted woods suggested that the degradation rate of crystalline cellulose was varied with the brown rot fungal species. X-ray diffraction analyses also indicated that crystalline cellulose was much more slowly broken down than the amorphous one. The most notable difference in the IR spectra of the brown-rotted wood samples was that the adsorption band centered at 1,730
was significantly diminished in the decayed wood. indicating the degradation of hemicellulose by brown-rot fungi. However, no marked changes of intensities at 1,000, 1,060 and 1,040
were observed in the brown rotted wood samples, suggesting that crystal line cellulose was resistant against the attack by brown rot fungi.
Some Recent Topics in Cellulose Chemistry
Ishizu, Atsuhi ;
Journal of the Korean Wood Science and Technology, volume 20, issue 3, 1992, Pages 61~66
It is well known that polymer chemistry started by the study on cellulose. However, the study on cellulose has not made a significant progress after the 2nd World War, because the interest of researchers has directed to the newly developed synthetic polymer science. Recently the situation has been changing as suggested by the creation of a word "Cellulose Renaissance". This change is due to the recognition that cellulose is a renewable resource and a biodegradable, environmentally friendly material. In this lecture I'd like to introduce you some recent topics in cellulose chemistry which were reported by Japanese researchers.
Application of Microorganism to Pulping and Bleaching Processes
Sakai, Koki ;
Journal of the Korean Wood Science and Technology, volume 20, issue 3, 1992, Pages 67~78
The application of white-rot fungi to pulping and bleaching processes has been studied at the Wood Chemistry Laboratory in Kyushu University, cooperatively with the Biotechnology Laboratory of Kobe Steel, Ltd. Some successful results of the studies for a biomechanical pulping process, biobleaching of hardwood and softwood kraft pulp, as well as chlorine free biobleaching of oxygen-prebleached hardwood kraft pulp are dealt with. Biological treatment of the pulp bleaching effluent is also described.
The Prospect ＆ Situation of Domestic Wood based Panel Industries
Park, Myung-Do ;
Journal of the Korean Wood Science and Technology, volume 20, issue 3, 1992, Pages 79~88
Biotechnology in the Pulp and Paper Industry
Kim, Eun-Hee ; Oh, Joung-Soo ; Jo, Byoung-Muk ;
Journal of the Korean Wood Science and Technology, volume 20, issue 3, 1992, Pages 89~103