Journal of the Korean Wood Science and Technology

The Korean Society of Wood Science & Technology (한국목재공학회)
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Air Circulating Oven-drying Characteristics of Hollowed Round-post for Korean Main Conifer Species Part 3: Effects of Water-vapor Dam and Heartwood Coating Treatments

  • Lee, Nam-Ho (College of Agriculture & Life Sciences (Institute of Agricultural Science & Technology), Chonbuk National University) ;
  • Zhao, Xue-Feng (Department of Wood, College of Forestry, Beihua University) ;
  • Shin, Ik-Hyun (College of Agriculture & Life Sciences (Institute of Agricultural Science & Technology), Chonbuk National University) ;
  • Lee, Chang-Jin (College of Agriculture & Life Sciences (Institute of Agricultural Science & Technology), Chonbuk National University)
  • Received : 2011.12.26
  • Accepted : 2013.12.18
  • Published : 2014.03.25
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Abstract

In this study the effect of heartwood-coating (HCO), vapor-dam (VD), bark-remaining (BR) and bark-remaining-coating (BRC) treatments on the air circulating oven-drying characteristics of Japanese larch hollowed round-post was evaluated. The drying times of the hollowed round-posts for control, VD, HCO and BR specimens were 72, 168, 204 and 240 hours, respectively, from the initial MC to about 8% MC, which was recommended as the indoor in-use MC. The temperature in the hole of the VD specimen was lower than that of wood and the difference between air temperature in the hole and wood temperature became large during drying period. The vapor pressure of air in the hole was higher than that of inside wood for all specimens except VD specimen. The surface checks on all specimens were observed in increasing order of BR, BRC, UC, HCO and VD specimens.

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References

  1. Evans, P.D., Hill, R.W., Barry, S.C. 2000. The effects of different kerfing and center-boring treatments on the checking of ACQ treated pine posts exposed to the weather. Forest Products Journal 50(2): 59-64.
  2. Fang, F., Ruddick, J.N.R., Avramidis, S. 2001. Application of radio-frequency heating to utility poles. Part 1. Radio-frequency/vacuum drying of roundwood. Forest Products Journal 51(7/8): 56-60.
  3. Lee, N.H., Luo, J.Y. 2002. Effect of steam explosion treatments on drying rates and moisture distributions during radio-frequency/vacuum drying of larch pillar combined with a longitudinal kerf. Journal of Wood Science 48: 270-276. https://doi.org/10.1007/BF00831346
  4. Ruddick, J.N.R., Ross, N.A. 1979. Effect of kerfing on checking of untreated Douglas fir pole sections. Forest Products Journal 29(9): 27-30.
  5. Yoshida, T., Hashizume, T., Fujimoto, N. 2000. High-temperature drying characteristics on boxedheart square timber of karamatsu and sugi- Influences of high temperature conditions with low humidity on drying properties. Mokuzai Kogyo 55(8): 357-362 (in Japanese).
  6. Yeo, H.M., Shim, K.B., Lee, D.S., Park, J.S., Eom, C.D., Han, Y.J., Lee, H.W., Lee, N.H., Smith, W.B., Park, J.H. Park, M.J. 2007. Effects of center boring and kerf treatment on kiln-drying of larch square and round timbers. Forest Products Journal 57(11): 85-92.