Journal of the Korean Wood Science and Technology

The Korean Society of Wood Science & Technology (한국목재공학회)
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Effects of The Knife-incising and Kerfing Pretreatment on Moisture Content and Surface Check Occurrence of Douglas-fir Heavy Timber

배할 및 자상-인사이징 전처리가 Douglas-fir 중목구조부재의 함수율과 재면할렬 발생에 미치는 영향

  • 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 : 2015.11.16
  • Accepted : 2016.02.02
  • Published : 2016.05.25
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Abstract

This study was carried out to confirm the effects of the knife-incising and kerfing pretreatment on the moisture content and surface check occurrence of Douglas-fir heavy timber. In the case of moisture content, the moisture gradient that formed in the inner part of the specimen was observed in all specimens. In addition, the moisture gradient was formed differently from the surface layer to 72 mm depending on the pretreatment conditions, and it was formed gradually in the kerfing than the knife-incising. In addition, it was found that the solid volume should be considered when measuring the average moisture content. In the case of surface check, the surface check occurrence was reduced in the knife-incising, kerfing, and the combination of knife-incising and kerfing than the control. In particular, the kerfing treatment was shown that the expansion of surface check width was effectively suppressed. In the case of knife-incising treatment, although the surface check was less than the control, the preventive effect on the surface check occurrence did not reach the level of the kerfing treatment.

본 연구는 배할과 자상-인사이징 처리가 Douglas-fir 중목구조부재의 함수율과 재면할렬 발생에 미치는 영향을 확인하기 위해 수행되었다. 그 결과 함수율의 경우, 횡단면 크기에 관계없이 모든 시험재들에서 수분경사가 존재하였으며, 전처리 조건에 따라 표층으로부터 72 mm 깊이까지 수분경사가 다르게 형성되어 있었다. 표층으로부터 72 mm 깊이까지 형성된 수분경사는 자상-인사이징보다 배할 처리한 시험재가 더 완만하게 형성되었다. 또한 전기저항식 수분계를 이용한 평균함수율 측정에 있어 단면이 증가함에 따라 실질률의 고려가 중요한 것으로 나타났다. 재면할렬의 경우, 전처리 조건에 따른 차이가 존재하였으며, 자상-인사이징처리와 배할처리 모두 건조 후 발생된 재면할렬의 감소가 가능하였다. 특히 배할은 재면할렬의 폭이 확장되는 것을 억제하는데 효과적이었다. 하지만 자상-인사이징의 경우, control과 비교하였을 때 재면할렬 발생의 억제가 가능하긴 하였으나, 그 효과가 배할의 수준에 미치지 못하였다.

Keywords

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Cited by

  1. Effects of the Knife-Incising and Longitudinal Kerfing Treatment on High-Temperature Drying Characteristics of Red Pine Square Timber vol.44, pp.5, 2016, https://doi.org/10.5658/WOOD.2016.44.5.677
  2. Studies on the High-Temperature Drying Characteristics of Douglas-fir, Hemlock and Radiata Pine Square Timber vol.44, pp.5, 2016, https://doi.org/10.5658/WOOD.2016.44.5.726