Go to the main menu
Skip to content
Go to bottom
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 19, Issue 4 - Dec 1991
Volume 19, Issue 3 - Sep 1991
Volume 19, Issue 2 - Jun 1991
Volume 19, Issue 1 - Mar 1991
Selecting the target year
Present Situation and a Suggestion for Development of Furniture Industry in Korea
Sohn, Sung-Ho ;
Journal of the Korean Wood Science and Technology, volume 19, issue 4, 1991, Pages 3~6
Preservative Treatment of Thinned Small-diameter Logs by Double-diffusion Processes
Kim, Gyu-Hyeok ; Kim, Jae-Jin ; Jee, Woo-Guen ;
Journal of the Korean Wood Science and Technology, volume 19, issue 4, 1991, Pages 7~17
The feasibility of treating three softwood(Japanese larch pitch pine, and Korean pine) thinned logs by double-diffusion treatment processes was investigated. Some posts were incised before immersion, and others were imersed in hot copper sulfate solution. Comparison among species indicated that. in general, pitch pine was most treatable and Japanese larch least treatable. For all three species, almost all treatment schedules gave consistently good penetration and high net retention, but very steep gradient of preservative distribution. As expected, the treatability was increased by the extension of immersion time, increased concentration of treating solution, incising. and heating of the first solution. Of the variables tested, it appears that heating of the first solution is the most important. From the data in this paper, it may be concluded that, if the first solution is not heated, the best schedule is #3. If the first solution is healed. it appears the best schedules are #10 or #11. Since heating of the first solution improves the treatability. schedules # 10 or :#11 are recommended if the cost of heating might be justified. The data presented in this paper indicate that double-diffusion treatment processes seem to offer a promise as a comparatively effective and easy-operating method of treating thinned logs for the small-scale production of treated stock.
Study on the Activation of Adhesion for the Manufacture of the Wood Based Panel Products
Lee, Hwa-Hyoung ;
Journal of the Korean Wood Science and Technology, volume 19, issue 4, 1991, Pages 18~26
This study was carried out to examine not only the effect and the process of activation of aluminum sulfate for the manufacture of PB and MDF, but also application of the activation treatment to PB and MOF made with MDI adhesive. The results were as follows: 1. For the manufacture of PB, activating effect did not take place Because the low moisture content of 30% in the process of activation treatment made probably insufficient activation. It needs to examine higher moisture content for the uniform and enough activation same as that of MOF. 2. In the case of MOF, Activating effect was excellent, it showed not only better results of MOR 48%, MOE 29%, IB 60% than those of the control but also better dimensional stability. 3. Application of alum activation to the PB and MDF made with MDI adhesive yielded no effects. Maybe it was the reson that the curing mechanism of MDI is different. 4. Modifing the wood surface was the oxidation and wettability was not the variable limiting glueline performance. It is necessary to make a more study about activating reaction.
Moisture Movement in Softwood and its Activation Energy
Kang, Ho-Yang ;
Journal of the Korean Wood Science and Technology, volume 19, issue 4, 1991, Pages 27~33
Three kinds of specimens(radiata pine sapwood, radiata pine heartwood and whemlock heartwood) were dried at four temperature levels (30, 40, 50 and
) in an emvironmental chamber. Unsteady-state diffusion coefficients were calculated from obtained drying fates by using infinite slab equation for first half of sorption and interval diffusion equation for second half of sorption. Activation energies for moisture diffusion in wood were calculated from the diffusion coefficients obtained at four temperatures. In most cases diffusion coefficients for radial movement were higher than those for tangential movement. Activation energy differences between sapwood and heartwood weren't significant for radial movement, but were significant for tangential movement. Most activation energies calculated from drying rates were lower than heat of water condensation(about 11,000cal/mole). Specially the avenge activation energy for sapwood tangential movement was only 5,000cal/mole.
Structures and Competitiveness of Softwood Products in Korean Import Market
Kim, Wae-Jung ;
Journal of the Korean Wood Science and Technology, volume 19, issue 4, 1991, Pages 34~42
Protection of tropical forest affects on significant reduce of tropical hardwood supply, and softwood resources will be increasingly important for the timber security in Korea. U.S. softwood log was most favorite species for Korean softwood log importers in overall import conditions except price stablization and consistency of export policy. Reduced export volume from Pacific Northwest to Korean market has been immediately replenished by rediata pine from New Zealand and Chilean plantation. Siberian timber will hardly play major roles in Korean timber market unless budding structure. softwood plywood and softwood furniture uses are enhanced. Recent rapid rise of labor cost and reducing tariff rrate in Korea provided better opportunities for import lumber in building materials market. Dry dimension lumber was relatively profitable when processed from import U.S. soft-wood log while green lumber was favorable products processed from radiata pine log in Korean lumber market. This means U.S. softwood lumber would have better opportunity to market for '2
'4 studs when wood frame housing is introduced. On the other hand while radiata pine is competitive on temporary construction lumber such as supporter and concrete forming frame in Korea. Shortage of raw material for the new capacity of board plants in Korea will be it bottle neck. Major log export countries to Korea as U.S. New Zealand and Chile showed high trade intensity indices of composite hoard produces for Korean market. As Korea efforts to diversify import sources, and tariffs are reduced to 8% as scheduled by 1994. countries of scoring higher comparative advantages as Portugal. Brazil, Austria as well as New Zealand will have better opportunity to penetrate into promised Korean composites hoard market.
Holding Strength of Screw in Domestic Particleboard and Medium Density Fiberboard(II) -Predicting Formula of Withdrawal Strength of Screw-
Lee, Phil-Woo ; Park, Hee-Jun ; Han, Yu-Soo ;
Journal of the Korean Wood Science and Technology, volume 19, issue 4, 1991, Pages 43~51
This study was carried out to determine the withdrawal strength of various screws according to root diameter of screw and embeded length on the face and edge of domestic particleboard and medium density fiberboard. The obtained results were as follows: 1. The withdrawal strength of screw in domestic particleboard and medium density fiberboard was closely related to embeded length of the screw but less dependent on root diameter of the screw. 2. The withdrawal strength on the face and edge of domestic particleboard could be predicted by means of the following expression:
: withdrawal strength on the face of particleboard(kgf)
=withdrawal strength on the edge of particleboard(kgf) D=diameter of the screw(mm) L=embeded length(mm) 3. The withdrawal strength on the face and edge of domestic medium density fiberboard could he predicted by means of the following expression:
= withdrawal strength on the face of medium density fiberboard(kgf)
=withdrawal strength on the edge of medium density fiberboard(kgf).
Studies on Absorption and Desorption Wood - Difference of Absorption and Desorption Behavior of Wood -
Lee, Weon-Hee ;
Journal of the Korean Wood Science and Technology, volume 19, issue 4, 1991, Pages 52~61
In this paper, the difference of the property of absorption and desorption for five species in semi-steady state are studied. The species used are listed in Table 1 and the dimension of specimen was
(Tangential direction)cm and tested in various conditions. A change of average moisture content with time were measured in each cycles. The results obtained are summarized as follows. When the relative humidity in air was maximum or minimum, the distribution of moisture In wood of all specimens were illustrated by exponential curves of decrease or increased from lace 10 center of wood. From the consideration of coefficient of decrease(C), the amount of moisture change of spruce was larger than the others. The pheonomenon was considered no relation to the specific gravity in air dry, but the wood structures. The velocity of the absorption and desorption for species decreased in the order spruce(Picea sitchensis) neodobam(Fagus crenata), solsong(Tsuga heterophylla), meranti(Shorea sp.) and kaesoo(Cercidiphyllum japoicum). In case of constant temperature and water vapor pressure is changed. the amount of absorbed moisture was larger than that of constant water vapor pressure and temperature vaned. In this fact, it is considered that the property of sorption of wood is strongly influenced by vapor pressure gradient than temperature gradient.
The Effect of Boron Deficiency on the Wood Quality of Pinus radiata D. Don
Han, C.S. ; Singh, A.P. ; Skinner, M. ;
Journal of the Korean Wood Science and Technology, volume 19, issue 4, 1991, Pages 62~71
Chemical Analyses of Coniferous Flavonoids in Korea - The Flavonoids of Red Pine Bark(Pinus densiflora) -
Kim, Hoon ; Song, Hong-Keun ; Chung, Dae-Kyo ;
Journal of the Korean Wood Science and Technology, volume 19, issue 4, 1991, Pages 73~79
The flavonoids from plants is very widly used as natural dye for food and medicine etc. In this study, red pine which is widespread in Korea was studied to find new chemicals which may use as raw material for the special purpose. The fIavonoids of red pine bark were separated with Sephadex LH-20 and Toyo pearl HW-40F as packed materials and the structure of separated f1avonoids was determined by
-NMR spectroscopy. The (+) catechin which is widespread in nature and dihydroquercetin-3'-0-
-galactoside were found in red pine bark. The dihydroquercetin-3'-0-
-galactoside is newly found in this species.
Hydrocarbon Synthesis of Waste Lignocellulosics by Liquefaction Reaction of Thermochemical Deoxyhdrogenolysis Method (II)
Lee, Byung-Guen ;
Journal of the Korean Wood Science and Technology, volume 19, issue 4, 1991, Pages 80~84
Lignocellulosic biomass including acetosolv ricestraw and spruce lignin were liquefied and converted into liquid hydrocarbons by catalytic hydroliquefaction reaction. These experimental works were carried out in 1-liter-capacity autoclave using 50% tetralin and m-cresol solution respectively as soluble solvent and Ni. Pd. Fe and red mud as catalyst.
gas was supplied into the reactor for escaltion of deoxhydroenolysis reaction. Catalyst concentrations were 1 % of raw material based on weight. The ratio between raw materials and soluble solvent are 1g and 10cc. The reaction conditions are 400-
of reaction temperature, 10-50 atms of reaction pressure. The highest yield of hydrocarbon, so called "product oil" showed 32% and 5.5% of lowest char formation when red mud was used as catalyst. The product oil yields from those of other catalysts were in the range of 20-29%. The influence of different initial hydrogen pressures was examined in the range d 30-50 atms. A minimum pressure of 35 atms was necessary to obtain a complete recovery of souble solvent for recycling.