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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 22, Issue 4 - Dec 1994
Volume 22, Issue 3 - Sep 1994
Volume 22, Issue 2 - Jun 1994
Volume 22, Issue 1 - Mar 1994
Selecting the target year
Research Trends and Development Directions of Plywood and Similar Products
Suh, Jin-Suk ;
Journal of the Korean Wood Science and Technology, volume 22, issue 3, 1994, Pages 1~16
Studies on Properties of Com-Ply Board and Oriented Strand Board
Park, Heon ;
Journal of the Korean Wood Science and Technology, volume 22, issue 3, 1994, Pages 17~25
This study was carried out to compare the properties of Com-Ply Boards with those of OSBs. These two kinds of boards were made of same flakes. Com-Ply Boards were covered with three different thickness veneers, such as 4mm, 3mm, and 2.5mm. All manufactured Com-Ply Boards and OSBs were 12mm thick. In MOR, all Com-Ply Boards were higher than OSB, and especially 3mm-veneer and 2.5mm-veneer Com-Ply Board were highest. But OSB showed 420kg/
. 3mm-veneer Com-Ply Board showed the highest internal bonding 7.0kg/
and then 2.5mm-veneer showed 6.8kg/
, and OSB showed 6.6kg/
. Screw holding strength showed the high value 23.9kg/
, and 29.3kg/
respectively at 3mm-veneer, 2.5mm-veneer Com-Ply Board and OSB. Thickness swelling of Com-Ply Boards was lower than that of OSB, but Water absorption of OSB was lower. Finally it was very encouraging that all properties of OSB without veneer, whose cost is higher than flake and whose properties is better, were not worse than those of Com-Ply Board with veneer. It seems That more researches on OSB will be required.
A Study of Recycle of Waste Wood after Cultivating Oak Mushroom - On the Crystal Structure of Cellulose -
Kim, Nam-Hun ; Lee, Won-Yong ;
Journal of the Korean Wood Science and Technology, volume 22, issue 3, 1994, Pages 26~31
To provide further information for reutilization of the waste wood obtained after cultivating oak mushroom in Kangwon-do, the crystal structures of the waste wood were investigated and compared to those of normal woods by a series of x-ray diffraction analysis. The results obtained are as follows: 1. An x-ray diffraction diagram of cultivated wood for 5 years was same as that of typical cellulose with some orientation of cellulose crystallites, but that of cultivated wood for 8 years a random. 2. Crystallinity indices in normal and cultivated woods for 5 years ranged from 57% to 60%. In the cultivated wood for 8 years, however, the value showed about 40%. 3. Crystallite widths of cultivated woods for 5 years and for 8 years were 3 nm and 2.5 nm, respectively. 4. Intensity ratios of equatorial and meridional layers did not show any significant differences. From the above results, it is clear that the waste wood obtained after cultivating oak mush room for 5 years showed basically same crystal structures with normal wood. Therefore, we think that the waste wood may be used available for cellulosic material instead of normal wood.
Thermoplasticization of Wood by Benzylation
Han, Gyu-Seong ; Kim, Eun-Kyoung ;
Journal of the Korean Wood Science and Technology, volume 22, issue 3, 1994, Pages 32~38
The methods in wood processing are so limited at present that a scope of its utilization is restricted. This often makes wood itself less valuable as a material comparing with other materials, that is, plastics, metals, and glass. Such differences are due to a lack of plasticity in wood, i.e. it cannot be melted, dissolved, or softened sufficiently for molding. However, once plastic properties are added to wood, it becomes more useful material. This further broadens the method in wood processing to a variety of fields. In this way, wooden material which is limited in use can be modified into a high quality product with additional value. Furthermore, utilization of wastes from wood, for example, would be made viable. In this study, thermoplasticization was carried out by benzylation of wood(sawdust). Various factors those affect the reaction were tested to produce benzylated wood with different degrees of substitution. Reaction temperature and time were the quite important factors. Optimum reaction temperature was 110
, and weight percent gains(WPG) of final products increased gradually with the increase of reaction time. The pretreatment (or preswelling) of wood with alkaline solution had a critical effect on benzylation. and the concentration of alkaline solution should be above 30% to obtain high weight percent gain. The thermal flow temperature of the benzylated wood decreased with the increase in weight percent gain, that of 80% weight percent gain is about 200
Features of Spiral Thickenings in Korean Dicotyledonous Woods
Kim, Jae-Woo ; Kim, Yu-Jung ; Park, Sang-Jin ;
Journal of the Korean Wood Science and Technology, volume 22, issue 3, 1994, Pages 39~44
This study was carried out to investigate features pertaining to spiral thickenings, which was considered one of the most important diagnostic values, for wood identification. Species, kind of cells with spiral thickening, and ridge numbers of spiral thickening per axial mm were recorded in 71 families, 144 genera, 316 species of Korean hardwoods. Spiral thickening was observed in 128 of 316 species, about 40.5 % of all the investigated, and classified into 6 types on the basis of distributional patterns and morphological features as follows: 1. Type 1, present throughout all vessel element, which was found in 14 families, 19 genera, 43 species. 2. Type 2, present only in small vessel element, which was found in 18 families, 29 genera, 41 species. 3. Type 3, present both in small vessel element and wood fibers, which was found in 8 families, 17 genera, 29 species. 4. Type 4, present in wood fibers, which was found in 1 family, 1 genus, 1 species. 5. Type 5, present only in tail of vessel element, which was found in 4 families, 5 genera, 9 species. 6. Type 6, being present in vessel element faintly or partially, which was found in 2 families, 3 genera, 5 species.
A Color Difference of White Polyurethane Coating Containing Antioxidant
Lee, Phil-Woo ; Yun, Young-Ki ;
Journal of the Korean Wood Science and Technology, volume 22, issue 3, 1994, Pages 45~50
This experiment was to investigate the effects of UV radiation and chemical treatments on the color difference in antioxidant (Tris(2,4-di-t-butyl phenoxy) phosphite)-containing polyurethane coats. The results obtained were summerized as follows: 1. The color difference increased as the exposure time of UV radiation increases, but decreased as addition level of antioxidant increaes. 2. After 400 hours exposure to UV radiation, the color difference respectively showed 6.13 and 5.94 at 0.7 % and 1.0 % addition level but appeared more severe below 0.7 % addition level. Thus, antioxidant prevented discoloration effectively. 3. The color difference of films by chemical treatments increased after 8 hours. Color difference of films treated with 5 % acetic acid(
), 30 % ethyl alchol (
) showed 7.31 and 7.30 respectively. 1 % sodium hydroxide treatment showed 1.86 color difference after 8 hours.
Environmental Conservation and Wood Utilization
Jang, Sang-Sik ;
Journal of the Korean Wood Science and Technology, volume 22, issue 3, 1994, Pages 51~58
Environmental conservation has become one of the greatest concerns of all the people in the world. This issue is related to wood utilization in two major view points such as carbon dioxide emitted by the use of manufacturing energy and absorbed during the growth of trees. Wood construction materials require less manufacturing energy, which, in turn, means less carbon dioxide emission. In addition, wood keeps absorbed carbon in itself as far as it is not burnt. Therefore, wood is environmentally superior to other materials in terms of potential effects on atmospheric carbon dioxide. As examples of the environmental effect of wood utilization, the following two results were obtained: 1) If wood construction becomes popular in Korea as in Japan, more than 24% of carbon dioxide emission during construction of residential housings can be reduced: and 2) If aluminum windows are substituted by wood windows, more than 19% of carbon dioxide emission can be reduced. If the principle of "cut and plant" is kept well, wood is the best construction material for environmental protection as well as human residence.
Essential Oil Components of Leaves and Resins from Pinus densiflora and Pinus koraiensis
Song, Hong-Keun ; Kim, Jae-Kwang ;
Journal of the Korean Wood Science and Technology, volume 22, issue 3, 1994, Pages 59~67
The essential oils of leaves and resins from P. densiflora and P. koraiensis were analyzed to identify their components. After each retention times of 45 known terpenoids were dertermined with a fixed analytical condition by GC the essential oil compounds of leaves and resins were identified by comparing their retention times with the retention times of known standards. To confirm these results the essential oil components of leaves from P. koraiensis were analized by 2 different GC/MS. According to these results, 36 terpenoids in essential oils of leaves from P. densiflora and P. koraiensis were identified and 15 terpenoids and 22 terpenoids were identified from P. koraiensis resin and P. densiflora resin, respectively. The major components which are more than 2% of total amaunt of volatile components were as follows: 1. The major terpenoids of leaves from red pine.
-phellandrene, myrcene, terpinolene,
-terpineol. 2. The major terpenoids of leaves from korean pine.
-pinene, camphene, myrcene, D-limonene, 3-carene, terpinolene, bornyl acetate,
-cardinene. 3. The major terpenoids of resin from red pine.
-phellandrene, linalool, linalyl acetate. 4. The major terpenoids of resin from korean pine.