Browse > Article

Effect of End-taping Treatments on Prevention of Drying Defects during Radio-Frequency/Vacuum Drying of Domestic Yellow Poplar Log Cross Section  

LEE, Nam-Ho (College of Agriculture & Life Sciences (Institute of Agricultural Science & Technology), Chonbuk National University)
ZHAO, Xue-Feng (College of Agriculture & Life Sciences (Institute of Agricultural Science & Technology), Chonbuk National University)
Chang, Sae-Hwan (College of Agriculture & Life Sciences (Institute of Agricultural Science & Technology), Chonbuk National University)
SHIN, Ik-Hyun (College of Agriculture & Life Sciences (Institute of Agricultural Science & Technology), Chonbuk National University)
Publication Information
Journal of the Korean Wood Science and Technology / v.36, no.6, 2008 , pp. 59-68 More about this Journal
Abstract
This study was carried out to investigate the effects of the Inside end-taping (Inside-ET) and Outside end-taping (Outside-ET) treatments on prevention of drying defects during radiofrequency/vacuum (RF/V) drying domestic yellow poplar log cross section with size of 20~75 mm in thickness and 120~470 mm in diameter. The treatments of Inside-ET and Outside-ET were quite effective for producing sound log cross sections with thinner than 33 mm and smaller than 270 mm in diameter. Even the 60 mm- and 75 mm-thick log cross sections, if the diameter was smaller than 30 cm, it might expect preventing formation of border checks by appropriate end-taping treatments. The positions of the observed border checks differed in diameter ranging at a relative radius about 0.50~0.63 diameter, and it was estimated that it was necessary to select the border position of end-taping treatment properly according to the diameter of log cross sections. It was observed that the radius of 0.3 diameter was the critical location for pretreatment for preventing formation of border checks in the log cross section with middle diameter. There were severe border checks and V-shaped cracks in the log cross section with large diameter. This was because of the severe variation of moisture content along radial direction of natural characteristic of domestic yellow poplar.
Keywords
Inside end-taping; outside end-taping; log cross section; radio-frequency/vacuum drying; border checks; V-shaped cracks;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 Choi J. H. and N. H. Lee. 2008. Investigation of radial distribution of tangential strains and of moisture contents within a log cross section by circumferential Slices. J. of the Korean Wood Sci. and Tech. 36(2): 20-28.
2 Kang W., N. H. Lee, and J. H. Choi. 2001. A radial distribution of moistures and tangential strains within a larch log cross section during radio-frequency/ vacuum drying. Proceedings of 7th International IUFRO Wood Drying Conference, Tsukuba, Japan: 376-381.
3 Lee N. H., K. Hayashi, and H. S. Jung. 1998. Effect of radio-frequency/vacuum drying and mechanical press-drying on shrinkage and checking of walnut log cross sections. Forest Prod. J. 48(5): 73-79.
4 Lee N. H. and K. Hayashi. 2000. Effect of endcovering and low pressure steam explosion treatment on drying rate and checking during radio-frequency/vacuum drying of Japanese cedar log cross sections. Forest Prod. J. 50(2): 73-78.
5 Lee N. H., C. Li, and J. H. Choi. 2002. Determination of trend of a radial distribution of moisture content within a log cross section by oven - drying of circumferential slices. J. of the Korean Wood Sci. and Tech. 31(1): 10-15 (in Korean).
6 Kang W., N. H. Lee, and J. H. Choi. 2004. A radial distribution of moistures and tangential strains within a larch log cross section during radiofrequency/ vacuum drying. Holz als Roh und Werkstoff Vol. 62: 59-63.   DOI
7 Xie D. 2007. Effect of alternating vacuum and release process on drying chracteristic during radio- frequency/vacuum drying of woods. Master thesis, Chonbuk National University, Korea: pp. 30-77.
8 Choi J. H. and N. H. Lee. 2004. Effect of end-taping and removal of sapwood on radial distribution of moisture content and tangential strains during radio-frequency/vacuum drying of Cedrela sinsensis log cross sections. J. of Wood Science 50: 315-320.