Journal of the Korean Wood Science and Technology

The Korean Society of Wood Science & Technology (한국목재공학회)
권호 표지
DOI QR코드

DOI QR Code

Estimation of Wood Oven-Dry Density by Using a Portable Dielectric Moisture Meter

휴대용 유전율식 수분계를 이용한 목재의 전건밀도 추정

  • Kang, Chun-Won (Department of Housing Environmental Design, and Research Institute of Human Ecology, Chonbuk National University) ;
  • Lim, Ho-Mook (Department of Bio-based Materials, Chungnam National University) ;
  • Kang, Ho-Yang (Department of Bio-based Materials, Chungnam National University)
  • 강춘원 (전북대학교 주거환경학과) ;
  • 임호묵 (충남대학교 환경소재공학과) ;
  • 강호양 (충남대학교 환경소재공학과)
  • Received : 2017.07.26
  • Accepted : 2017.09.06
  • Published : 2017.09.25
Download PDF
⟨ Previous Next ⟩

Abstract

Tripitaka Koreana in Haein Temple, Hapcheon Province is the most historical and largest heritage in this country, however the species of their blocks have yet been unknown. A nondestructive test method is necessary to investigate their species. The oven-dry density of wood was measured by inversely using the principle of high frequency moisture meter. The oven-dry densities of more than 100 domestic species of specimens estimated by measurement method and high frequency moisture meter were compared and following conclusions were obtained. There was highly close correlation between the oven-dry density estimated by measurement method and the oven-dry density estimated by high frequency moisture meter. The densities of Tripitaka Koreana that was a global cultural heritage could be correctly estimated by using high frequency moisture meter and the equilibrium moisture content under which Tripitaka Koreana equilibrated, thus, it was expected to provide the key to species identification.

현재 합천 해인사에 보관되어 있는 고려속장경(일명 팔만대장경)은 역사적 가치나 규모면에 있어서 세계적인 문화재이나 아직도 어떤 수종으로 만들어졌는지 모르고 있다. 중요한 문화재이기 때문에 손상없이 비파괴적으로 수종을 추정하는 방법이 필요하다. 밀도를 알게 되면 수종을 추정하기 쉽다. 유전율식 목재수분계의 원리를 역으로 이용하면 함수율을 알고 있는 목재의 전건밀도를 얻을 수 있다는데 착안하여 연구를 수행하였다. 국내산 100여 개 수종, 122개 재감의 전건밀도를 치수법과 유전율식 목재수분계 추정법으로 구하여 두 계수의 상관관계와 회귀식을 찾았으며 문헌자료를 이용하여 회귀식의 유의성을 검정하였다. 치수법으로 측정한 전건밀도와 유전율식 목재수분계로 추정한 전건밀도는 매우 높은 상관관계를 나타냈다. 이 관계식을 이용하면 팔만대장경판의 전건밀도를 추정할 수 있으며 나아가 수종을 예측할 수 있을 것이다.

Keywords

References

  1. Gillis, C.M., Stephens, W.C., Peralta, P.N. 2001. Moisture meter correction factors for four Brazilian wood species. Forest Products Journal 51(4): 83-86.
  2. James, W.L. 1988. Electric Moisture meter for wood. Gen. Tech. Rept. FPL-GTR-6. USDA Forest Serv., Forest Prod. Lab., Madison, WI pp.17.
  3. Jung, H., Kang, H., Park, J., Lee, N., Lee, H., Kang, C., Yeo, H. 2008. New Wood Drying. SNU Press, Seoul pp. 39.
  4. Kang, C., Kim, N., Kim, B., Kim, Y., Byun, H., So, W., Yeo, H., Oh, W., Lee, W., Lee, H. 2008. New Wood Physics and Mechanics. Whangmoonsa, Seoul pp.32, pp.323-324.
  5. KETT Manual. 2017. https://www.kett.com/files/brhm530.pdf.
  6. KFRI. 2007. One Hundred Useful Species in Korea. KFRI, Seoul.
  7. Milota, M.R. 1996. Calibration of moisture meters for western hardwood species. Forest Products Journal 46(1): 39-42.
  8. Milota, M.R. Gupta, R. 1996. Moisture meter correction factors for dahurian larch from the Russian Far East. Forest Products Journal 46(6): 91-93.
  9. Park, S. 1999. Story about the Tripitaka Koreana. Unsong Press, Seoul.
  10. Quarles, S.L. 1990. Sensitivity of two transverse feed inline moisture meters to wet pockets. Forest Products Journal 40(2): 34-38.
  11. Quarles, S.L. 1991. Sensitivity of handheld dielectric moisture meters to a wet core. Forest Products Journal 41(3): 33-36.
  12. Quarles, S.L., Milota. M.R. 1991. Influence of kiln temperature and density on the performance of in- line moisture meters. Forest Products Journal 41(5): 61-64.
  13. Wagner Meters. 2012. Species adjustment tables. http://www.wagnermeters.com/pdf/wagner-metersl606-l607-species-settings.pdf.
  14. Wu, Q. 1997. Calibration of Moisture Meters for Baldcypress (Taxodium disticbum). Forest Products Journal 47(10): 77-78.