Journal of the Korean Wood Science and Technology

The Korean Society of Wood Science & Technology (한국목재공학회)
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Effect of End-coating Around Pith of Heavy Timbers of Red Pine and Korean Pine on High-temperature and Low-humidity Drying Characteristics

중심부분 엔드코팅처리가 국산 소나무와 잣나무 중목구조부재의 고온저습건조 특성에 미치는 영향

  • Lee, Chang-Jin (College of Agriculture & Life Sciences(Institute of Agricultural Science & Technology), Chonbuk National University) ;
  • Lee, Nam-Ho (College of Agriculture & Life Sciences(Institute of Agricultural Science & Technology), Chonbuk National University) ;
  • Eom, Chang-Deuk (Division of Wood Engineering, Department of Forest Resources Utilization, Korea Forest Reasearch Institute) ;
  • Shin, Ik-Hyun (College of Agriculture & Life Sciences(Institute of Agricultural Science & Technology), Chonbuk National University) ;
  • Park, Moon-Jae (Division of Wood Engineering, Department of Forest Resources Utilization, Korea Forest Reasearch Institute) ;
  • Park, Joo-Saeng (Division of Wood Engineering, Department of Forest Resources Utilization, Korea Forest Reasearch Institute)
  • 이창진 (전북대학교 농업생명과학대학(농업과학기술연구소)) ;
  • 이남호 (전북대학교 농업생명과학대학(농업과학기술연구소)) ;
  • 엄창득 (국립산림과학원 녹색자원이용부 탄소순환재료과) ;
  • 신익현 (전북대학교 농업생명과학대학(농업과학기술연구소)) ;
  • 박문재 (국립산림과학원 녹색자원이용부 탄소순환재료과) ;
  • 박주생 (국립산림과학원 녹색자원이용부 탄소순환재료과)
  • Received : 2013.01.28
  • Accepted : 2013.05.23
  • Published : 2013.05.25
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Abstract

This study was performed to identify the effect of end-coating around pith of heavy timbers of Red pine and Korean pine on high temperature and low humidity drying characteristics. Total drying times were 268 hours, and ranges of final moisture content was investigated that Red Pine 9.2% to 10.8% MC for square and round timber, in case of Korean Pine 15.0% to 22.0% MC for square timber, 12.8% to 20.4% MC for round timber. Moisture content distribution of Red Pine was a uniform, but part of high moisture content was found in Korean Pine. In case of Korean pine, the surface checks were occurred more severe than in case of Red pine, and end-coating treatment were investigated to be ineffective on surface check. The internal checks were only formed on the two timbers. The value of the case hardenings was investigated that the ranges 3.7% to 9.1% for Red pine. In case of Korean pine, on the other hand, the case hardenings presence a few as 20.9% to 35.8%.

본 연구에서는 중심부분 엔드코팅처리가 소나무와 잣나무 중목구조부재의 고온저습건조에 미치는 영향을 알아보기 위해 수행되었다. 건조에 소요된 시간은 총 268시간 이었으며, 최종함수율은 소나무의 경우 정각기둥재와 원주기둥재 모두 9.2~10.8%, 잣나무 정각기둥재 15.0~22.0%, 원주기둥재 12.8~20.4% 범위로 조사되었다. 소나무재의 경우 함수율 분포가 균일한 반면, 잣나무재는 부분적으로 고함수율 부위가 존재하였다. 재면할렬은 잣나무가 더 많이 발생되었으며, 부분엔드코팅처리는 재면할렬 예방에 큰 효과가 없는 것으로 조사되었다. 내부할렬은 두 수종 모두에서 발생되었다. 표면경화율은 소나무재 3.7~9.1%, 잣나무재 20.9~35.8%로 경미한 크기의 잔류응력이 존재하였다.

Keywords

References

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