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Evaluation of Drying Properties and Yields of Domestic Quercus Species for Enhancing Utilization

국산 참나무류의 이용활성화를 위한 건조특성 및 가공수율 평가

  • Chang, Yoon-Seong (Department of Forest Products, National Institute of Forest Science) ;
  • Shin, Hyun-Kyeong (Department of Forest Products, National Institute of Forest Science) ;
  • Kim, Sejong (Department of Forest Products, National Institute of Forest Science) ;
  • Han, Yeonjung (Department of Forest Products, National Institute of Forest Science) ;
  • Kim, Min-Ji (Department of Forest Products, National Institute of Forest Science) ;
  • Eom, Chang-Deuk (Department of Forest Products, National Institute of Forest Science) ;
  • Lee, Young-Geun (Forest Practice Research Center, National Institute of Forest Science) ;
  • Shim, Kug-Bo (Department of Forest Products, National Institute of Forest Science)
  • 장윤성 (국립산림과학원 임산공학부) ;
  • 신현경 (국립산림과학원 임산공학부) ;
  • 김세종 (국립산림과학원 임산공학부) ;
  • 한연중 (국립산림과학원 임산공학부) ;
  • 김민지 (국립산림과학원 임산공학부) ;
  • 엄창득 (국립산림과학원 임산공학부) ;
  • 이영근 (국립산림과학원 산림생산기술연구소) ;
  • 심국보 (국립산림과학원 임산공학부)
  • Received : 2017.08.18
  • Accepted : 2017.09.08
  • Published : 2017.09.25

Abstract

In order to develop value-added utilization technology of domestic oaks the processing yield rate from the standing tree to the flooring material for the Quercus variabilis and Quercus mongolica were investigated. Also, to reduce drying time, improved drying schedule was applied and the physical properties were measured. The drying time was 173 hours in total, and the final moisture content was 5.39% (Quercus variabilis) and 4.17% (Quercus mongolica). The color difference of oak lumber before and after drying showed a significant change as ${\Delta}E$ value from 7 to 11. The shrinkage rates of Quercus variabilis and Quercus mongolica during drying were 8.1% and 8.5% in the tangential direction and 5.0% and 6.2% in the radial direction, respectively. The lumber manufacturing yield rate of sawn lumber was 30 to 40% and that of the final product was 8 to 15%. It is expected that the processing characteristics of the Quercus species investigated in this research could contribute to formulate an efficient production plan of domestic hardwoods that are still under utilization.

본 연구에서는 국산 참나무류의 고부가가치재 이용기술 개발을 위해 굴참나무와 신갈나무를 대상으로 입목으로부터 마루판재까지의 가공수율을 조사하였다. 또한 참나무류 건조시간 단축을 위한 건조스케줄의 개선 및 물성평가를 수행하였다. 건조시간은 총 173시간이 소요되었으며, 최종함수율은 굴참나무 5.39%, 신갈나무 4.17%로 측정되었다. 건조에 따른 굴참나무와 신갈나무의 재색변화는 ${\Delta}E$ 값이 7~11으로 현저한 변화를 보였다. 건조에 따른 수축률은 굴참나무의 경우, 접선방향 8.1%, 방사방향 5.0%이었으며, 신갈나무의 경우, 접선방향 8.5%, 방사방향 6.2%로 평가되었다. 제재수율은 30~40%, 최종제품수율은 8~15%로 평가되었다. 본 연구에서 조사된 참나무류의 가공특성은 아직까지 저이용되고 있는 국산 활엽수의 효율적인 생산계획을 수립하는데 기여할 수 있을 것으로 기대된다.

Keywords

References

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