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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 14, Issue 4 - Dec 1986
Volume 14, Issue 3 - Sep 1986
Volume 14, Issue 2 - Jun 1986
Volume 14, Issue 1 - Mar 1986
Selecting the target year
Drying Rate and Drying Defects of Populus euramericana Using the SDR(Saw-Dry-Rip) Process
Sim, Jae-Hyeon ; Jung, Hee-Suk ;
Journal of the Korean Wood Science and Technology, volume 14, issue 3, 1986, Pages 3~15
This study was carried out to investigate the drying rate and drying defects of Populus euramericana using the SDR (Saw-Dry-Rip) process. Flitches for SDR process were rough edged for compact kiln stacking, and then kiln-dried to 10 percent moisture content with dimensions in the same run, using the kiln-drying schedule (
) recommended by Rasmussen. The results obtained were as follows: 1. Drying rate of dimensions was slower than that of flitches. 2. Final moisture content and moisture distribution of dimensions were lower than those of flitches. 3. Average bowing, cupping, crooking, and twisting were reduced 20 percent, 25 percent, 54.9 percent, and 13.4 percent by SDR process respectively. 4. Bowing and cupping were more severe in dimensions from the area near the pith than in those from the area near the bark, and for crooking and twisting the reverse was true. 5. Surface checking of dimensions developed less than that of flitches and end checking of dimensions was similar to that of flitches. 6. Honeycomb, thickness shrinkage, and collapse of dimensions were similar to those of flitches. 7. The degree of casehardening of dimensions was higher than that of flitches.
Air - drying calendars of 24 districts in Korea
Jung, Hee-Suk ; Park, Moon-Jae ;
Journal of the Korean Wood Science and Technology, volume 14, issue 3, 1986, Pages 16~22
Effective air-drying days for four seasons and districts were calculated from average monthly temperature, relative humidity and wind speed records for 24 districts in Korea and air-drying calendars were prepared. And these districts were divided into zones of effective air-drying days. These results were as follows. 1. Effective air-drying days for four seasons were 20 to 23 days in springtime, 30 days in summertime, 21 to 26 days in autumntime, and 8 to 17 days in wintertime. 2. Effective air-drying days variated from district to district and was 237 days, the shortest period, in Ch'unch
n, and was 288 days, the longest period, in-S
gwipo. 3. Effective air-drying days were primarilly related to the difference in temperature from month to month, and secondarily, especially in September, were related to the differences in relative humidity, and were not related to wind speed. 4. South Korea was divided into 4 zones of effective air-drying days and these zones had it little difference compared with meteorological zones.
Microbial Conversion of Woody Waste into Sugars and Feedstuff (I) - Optimal Delignification condition with alkaline peroxide for enzymatic hydrolysis of poplar wood
Kim, Yoon-Soo ; Bang, Joo-Wan ; Chung, Ki-Chul ; Myung, Kyu-Ho ; Kim, Youn-Sik ;
Journal of the Korean Wood Science and Technology, volume 14, issue 3, 1986, Pages 23~29
Alakline peroxide pretreatment for the delignification of poplar wood was performed. sinceit is a simple and efficent method for enhancing the enzymatic digestibility of wood residues. Approximately one-half of their lignin and most of the hemicellulose present in poplar wood were removed when the wood sawdust was reacted at 25
for 100 hrs in an alkaline solution (pH 11.5) of 1% peroxide. The rate of decomposition as well as the saccharification efficiency were enhanced up to 350% and 260% respectively in comparision with those of the controll. This enhancement is comparable with that pretreated with 1% sodium hydroxide and 20% peracetic acid successively. The advantages of alkaline peroxide as delignifying agents against other chemicals were also discussed.
Studies on the Wood Extractives (III) - Isolation of Flavonoid and Sterol compounds -
Choe, Hyoung-Joo ; Hwang, Byung-Ho ;
Journal of the Korean Wood Science and Technology, volume 14, issue 3, 1986, Pages 30~35
To elucidate chemical structure of the wood extracitives, softwood Larix leplolepis Gorden) metal was extracted with 95% ethanol at room temperature for 72 hours. The extract was fractionated with organic solvents such as n-hexane, chloroform. ether, and ethylacetate. From the n-hexane soluble fraction of the extratives, flavonoid and sterol compounds were isolated and identified as taxifolin(5,7,3',4'-tetrahydroxyflavanonol)(I) and
-sitosterol(II) by UV, IR,
H-NMR spectroscopy and Mass spectrometry.
Enzymatic Characteristics of Laccase from White Rot Fungus, Flammulina velutipes
Suh, Dal-Sun ; Lee, Jae-Sung ; Cho, Nam-Seok ;
Journal of the Korean Wood Science and Technology, volume 14, issue 3, 1986, Pages 36~42
The production media and the enzymatic charateristics of laccase from Flammulina velutipes were investigated. The activity of laccase during incubation reached to the maximum at the 40 days of incubation in the case of Barley straw medium. The maximum laccase activity in Barley straw medium was 5 and 16 times higher than those in Onion basic and Sawdust media, respectively. The laccase from Flammulina velutipes has the optimum pH of 6.6 and showed to be stable at relatively broad pH range. 4.5-9.5. Temperature stability showed that above 96% activity could be preserved after holding at 40
for 40 minutes. At the above 70
, the laccase activity decreased very rapidly. The Km value of the laccase was estimated to be 28.0 mM which is much higher than that of the laccase from Pleurotus ostreatus. Organic solvents for precipitiation of the enzyme did not inactivation the laccase. Sodium azide which was added for preventing microbial deterioration affected significantly the inactivation of laccase, but this activity was recovered completely by precipitating the enzyme with acetone.
Synthesis of Methyl Alcohol and Alternative Gases for Petroleum by Thermochemical Gasification of Waste Lignocellulosic Materials (II) - Thermochemical Conversion of Sawdust, Ricestraw and Ricehusk Using Alkali Salts as Catalyst by Pressurized Reactor
Lee, Byung-Guen ;
Journal of the Korean Wood Science and Technology, volume 14, issue 3, 1986, Pages 43~46
A stainless steel autoclave reactor, which is the property of Pacific Northwest Laboratories(PNL) and located in PNL, was acted for pyrolysis and gasification of sawdust, ricestraw, and ricehusk. The initial reaction temperature of this reactor was 300
, and up to 500
to complete pyrolysis and gasification reaction. The maximum exerted pressure on this reactor was 800 psig. In order to examine the effect of catalyst on reaction temperature,
, and nickel/alkali carbonate catalyst mixture were also used. The experimental results obtained with this reactor indicated that good yields of methane-rich gas(exceeding 40% methane) can be produced. The product gas mixtures were also identified to be CO.
etc. by Gas Chromatography and Mass Spectrometer.