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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 11, Issue 4 - Dec 1983
Volume 11, Issue 3 - Sep 1983
Volume 11, Issue 2 - Jun 1983
Volume 11, Issue 1 - Mar 1983
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The Application of Rule of Mixtures to Fiber-Reinforced Composites(1) - Mechanical Properties of Fiber-Reinforced, Sulfur-Based Composites -
Lee, Byung-G. ;
Journal of the Korean Wood Science and Technology, volume 11, issue 3, 1983, Pages 3~13
Fiber mats were made at five density levels, using fibers from kraft pulp screening rejects, rice straw and a 50/50 mixture of the two. They were soaked in the sulfur compounds. Specimens cut from the composite panels were tested in flexure at time intervals for one year to study the effect of aging. Modulus of elasticity (MOE) and modulus of rupture (MOR) were determined. Under optimum conditions of fiber mat preparation and saturation with molten sulfur and modified sulfur, composites were produced which exhibited mechanical properties comparable to conventional fiberglass in some properties and superior to conventional wood-based composition boards, For example. the moduli of elasticity of the reinforced composites made from pulp screening rejects, with a density of 0.35 gm/
, were greater than 1,000,000 psi as compared 800.000 psi for high-density hardboard (1.28 gm/
). Modulus of rupture of the best reinforced composites was about 7,000 psi, comparable to 6,000 psi of high-density hardboard.
Effects of Short-Term Paraquat Treatment on Oleoresin Increases in Pitch Pine
Park, Won-Kyu ; Ahn, Won-Yung ;
Journal of the Korean Wood Science and Technology, volume 11, issue 3, 1983, Pages 14~22
The purpose of this study was to evaluate the effect of short-term paraquat treatment without insecticides on the enhancement in oleoresin of pitch pine (Pinus rigida M.) at various distances from the wound height. The trees were treated with 0.5, 2 and 4% paraquat solutions using the bore-hole technique. Duplicate cores from treated and untreated sides of treated trees were made at 5 height levels (-0.3, 0.0, 0.3, 0.9 and 1.5 m above the wound height) at 3 months after treatment. The alcohol-benzene extractives based on unextracted oven-dry cores were taken as oleoresin contents. The results were as follows: 1. The effect of oleoresin enhancement at wound height were not affected by paraquat concentration. 2. Ascending distance of the enhancing effects above the wound height was directly related to paraquat concentration. Only in 4% paraquat treated trees, the effect extended to 1.5 m above the wound height. 3. As a result of examining descending distance of the enhancing effects at 0.3 m below the wound height, the effects extended to there in 4% and 2% paraquat treated trees.
A Comparative Study on the Effect of Fire Retardancy of the Plywood Treated by Ammonium Sulphate and Monoammonium Phosphate
Lee, Phil-Woo ; Kim, Cheol-San ;
Journal of the Korean Wood Science and Technology, volume 11, issue 3, 1983, Pages 23~30
This experiment was carried out for diminishing the material loss and the damage of human life due to the fire disaster by treating plywood with fire retardant chemical solution. At this study, we observed and measured chemical retention, burning point, maximum flame length, flame exausted time, carbonized area, and weight loss of plywood treated by each solution of ammonium sulphate [
] and monoammonium phosphate [
]. Obtained results at the study may be summarized as follows: 1. In case of monoammonium phosphate-treated plywood, every tested item of fire retardancy was shown more excellent at the 25% chemical concentration and shown also at 9 hours treatment except maximum flame length compared with ammonium sulphate-treated plywood. 2. However in case of ammonium sulphate-treated plywood, 6 hours treatment of fire retardancy was better than 9 hours treating time. 3. Monoammonium phosphate was generally better than ammonium sulphate in every tested item.
A Study on the Physical Properties of Sawdust-Board Combined With Reinforce Material
Lee, Phil-Woo ; Park, Heon ;
Journal of the Korean Wood Science and Technology, volume 11, issue 3, 1983, Pages 31~38
This experiment was carried out to improve the physical and mechanical properties of sawdust-board by combining with reinforce material, that is, plastic wire screen and steel wire screen. In experiment results, the density of sawdust-board reinforced with three steel wire screens was highest and its bending strength was also highest. Wastepaper-5% mixed sawdust-board showed as high bending strength as other boards, and therefore the possibility of using wastepaper as raw materials for boards. The sawdust-board with steel wire screen was not ruptured immediatedly after having been deformed by static loading. However, plywood showed higher bending strength than the reinforced sawdust-boards.
Effects of the Treated Chemicals on the Flexual and Physical Properties of Fire Retardant Treated Particleboards
Lee, Phil-Woo ; Kwon, Jin-Heon ;
Journal of the Korean Wood Science and Technology, volume 11, issue 3, 1983, Pages 39~48
This research was performed to investigate the manufacturing possibility of the particleboard treated with commercial fire retardant chemicals. Laboratory test boards at this investigation were made from particles treated by soaking into 5, 10, 15, and 20 percent concentration solutions of ammonium sulfate and Minalith before resin was applied. According to the results, MOR (modulus of repture) and MOE (modulus of elasticity) in flexure exceeded type 100 (100 kgf/
) of the Korean Industrial Standard (KS F 3104). Except for 15 and 20 percent chemicals concentrations of Minalith, every internal bond stress values met type 100 (1.5 kgf/
) of KS F 3104. However thickness swelling values of fire retardant treated particleboards were not reached in the Standard (12%).
Study on Wood-Plastic Combination - On the Penetration of MMA Polymer and Dimensional Stability -
Lee, Won-Yong ;
Journal of the Korean Wood Science and Technology, volume 11, issue 3, 1983, Pages 49~57
This study dealts with the penetration of methyl methacrylate(MMA) monomer-solvent system into five Korean major tree species, especially the Pinus koraiensis S. et Z., Pinus densiflora S. et Z., Larix leptoiepis Gordon, Quercus serrata Thunb. and Betula platyphylla var japonica Hara. In this report I described the results of the interaction between wood and polymer loading by catalyst-heat polymerization. On the other hand the influence of penetration of polymer loading on dimensional stabilization on WPC of Pinus koraiensis by catalyst-heat polymerization was also investigated.
Chemical Structures of Lignin by Infrared Spectroscopy - Assignment of Infrared Absorption Bands in Lignin Compounds -
Hwang, Byung-Ho ;
Journal of the Korean Wood Science and Technology, volume 11, issue 3, 1983, Pages 58~69
This research is performed to compare lignin compounds isolated in Pinus koraiensis Sieb et Zucco, with those compounds which have been already isolated. and to elucidate IR spectra of functional groups and aromatic nucleus for chemical structure of lignin. In vanillin and dehydrodivanillin having carbonyl group ill
-position. characteristic absorption band of carbonyl group was confirmed in 1665
. Absorption band of vanillic and syringic acid with carboxyl group were indicated in 1675 and 1690
respectively. Syringic acid showed low wave number because this was affected by methoxyl group. Characteristic absorption bands of guaiacyl, syringly and guaiacyl-syringyl co-polymer nucleus were clearly disclosed in diarylpropane compounds. It were reconfirmed that absorption band of guaiacyl showed longer wave number than of syringly nucleus.
합판 품질검사 관계 규정집
Journal of the Korean Wood Science and Technology, volume 11, issue 3, 1983, Pages 70~77