Journal of the Korean Wood Science and Technology

The Korean Society of Wood Science & Technology (한국목재공학회)
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Studies on the High-Temperature Drying Characteristics of Douglas-fir, Hemlock and Radiata Pine Square Timber

Douglas-fir, Hemlock, Radiata pine 정각재의 고온건조 특성에 관한 연구

  • Lee, Chang-Jin (Department of Wood Science & Technology, Chonbuk National University) ;
  • Lee, Nam-Ho (Department of Wood Science & Technology, Chonbuk National University) ;
  • Oh, Seung-Won (Department of Wood Science & Technology, Chonbuk National University)
  • 이창진 (전북대학교 목재응용과학과) ;
  • 이남호 (전북대학교 목재응용과학과) ;
  • 오승원 (전북대학교 목재응용과학과)
  • Received : 2016.06.17
  • Accepted : 2016.08.18
  • Published : 2016.09.25
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Abstract

This study was carried out to evaluate the high-temperature drying characteristics of douglas-fir, hemlock, and radiata pine square timber with dimensions of thickness 15 cm and 18 cm. As a result, radiata pine showed the lowest final moisture content followed by douglas-fir and hemlock without reference to the timber size. Moreover, when the longitudinal kerfing is processed, the final moisture content was lower than control. The kerfing treatment was effective to decreasing the twist of radiata pine and hemlock. When douglas-fir is processed to the shape like the edge-grained timber that does not include the pith, the decrease of drying defect was possible.

본 연구는 두께 15 cm와 18 cm 크기 Douglas-fir, Hemlock, Radiata pine 정각재의 고온건조 특성을 평가하기 위해 수행되었다. 수종에 따른 최종함수율은 시험재의 두께에 관계없이 Radiata pine, Douglas-fir, Hemlock 순으로 Radiata pine에서 가장 낮았으며, 배할처리를 하였을 때 무처리재보다 낮은 함수율을 나타내었다. Radiata pine과 Hemlock의 경우 배할처리를 하였을 때 함수율과 뒤틀림 발생을 감소시키는 효과가 있는 것으로 나타났다. Douglas-fir는 수를 포함하지 않는 정목형태로 가공될 때 건조결함의 감소가 가능하였다.

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References

  1. Hwang, K.H., Park, B.S. 2009. Effect of cross-sectional dimension on the shrinkage property of Korean red-pine wood. Journal of the Korean Wood Science and Technology 37(3): 231-238.
  2. Hsu, N.N., Tang, R.C. 1974. Internal stresses in wood logs due to anisotropic shrinkage. Wood Science 7(1): 43-51.
  3. Jung, H.S., Lee, C.H., Kang, W., Eom, C.D. 2003. Air-drying curve and moisture content distribution of softwood square timber. Journal of the Korean Wood Science and Technology 31(1): 27-31.
  4. Korea Forest Service. 2011. Forestry Business Survey.
  5. Korea Forest Service. 2013. Forestry Business Survey.
  6. Lee, C.J., Lee, N.H., Eom, C.D., Shin, I.H., Park, M.J., Park, J.S. 2013. Effect of end-coating around pith of heavy timbers of red pine and korean pine on high-temperature and low-humidity drying characteristics. Journal of the Korean Wood Science and Technology 41(3): 221-233. https://doi.org/10.5658/WOOD.2013.41.3.221
  7. Lee, C.J., Lee, N.H., OH, S.W. 2015. Characteristics of twist occurrence according to the cross-sectional size and species on Thinning Timber dried with high-temperature and low-humidity drying. 2015 proceeding of the Korean Society of Wood Science Technology annual meeting, pp. 236-237.
  8. Lee, C.J., Lee, N.H., OH, S.W. 2016. Effects of the knife-incising and kerfing pretreatment on moisture content and surface check occurrence of douglas-fir heavy timber. Journal of the Korean Wood Science and Technology 44(3): 302-314. https://doi.org/10.5658/WOOD.2016.44.3.302
  9. Lee, C.J., Lee, N.H., Park, M.J., Park, J.S., Eom, C.D. 2014. Effect of reserve air-drying of korean pine heavy timbers on high-temperature and low-humidity drying characteristics. Journal of the Korean Wood Science and Technology 42(1): 49-57. https://doi.org/10.5658/WOOD.2014.42.1.49
  10. Ministry of Land, Infrastructure and Transport. 2016. Statistics of Building Permission Commencement Works.
  11. Simpson W.T. 1991. Dry kiln operator's manual. Forest Products Laboratory, Madison, United States.
  12. Williams, D.H., Kininmonth, J.A. 1984. High-Temperature Kiln Drying of Radiata Pine Sawn Timber. New Zealand Forest Service, Forest Research Institute Bulletin No. 73, Rotorua.