Journal of the Korean Wood Science and Technology
- 제25권4호
- /
- Pages.51-60
- /
- 1997
- /
- 1017-0715(pISSN)
- /
- 2233-7180(eISSN)
잣나무 간벌(間伐)통나무와 수심재(髓心材)의 가열판식(加熱板式) 진공건조(眞空乾燥) 특성
The Characteristics of Vacuum Drying Heated by Hot Plates for the Thinned Logs and Pillars of Korean Pine
- Jung, Hee-Suk (College of Agriculture & Life Science, Seoul National University) ;
- Lee, Nam-Ho (College of Agriculture, Chonbuk National University) ;
- Park, Jung-Hwan (Forestry Research Institute)
- 투고 : 1997.10.08
- 발행 : 1997.12.30
초록
We investigated the characteristics of air-and vacuum-drying heated by hot plates for 8~14cm-diameter logs or 6~12cm-thick pillars of Pinus koraiensis. And we evaluated the effects of longitudinal kerf and vacuum drying heated by hot plates. The vacuum drying times from green to 10.9~18.6% MC were 15 days, and these times were one-fifth compared to the air-drying times. The longitudinal kerfing had no significant, effect on drying rates during both air-drying and vacuum drying. But drying defects such as surface checks and V-shaped cracks were effectively prevented during air-drying and vacuum drying by longitudinal kerfing. The vacuum drying was more advantageous than air-drying for preventing of surface checks, end checks and V-shaped cracks, and especially, the vacuum dried pillars with longitudinal kerf were almost free from drying defects. In accelerated weathering conditions the resin did not exude for all specimens.
키워드