Measurement of Equilibrium Moisture Content of Wood at High Temperatures and Vapor Pressures

고온고압에서의 목재 평형함수율 측정

  • 이원희 (경북대학교 농과대학 임산공학과) ;
  • 히사시 아베 (일본국 자성현 농림성삼림종합연구소 목재이용부 물성연구실) ;
  • 나오히로 쿠로다 (일본국 자성현 농림성삼림종합연구소 목재이용부 물성연구실)
  • Received : 1998.06.10
  • Published : 1998.12.30

Abstract

In this study, it was examined the method to estimate equilibrium moisture content(EMC) at high vapor pressures and high temperatures above $100^{\circ}C$. The material used for the experiment was Sugi(Cryptomeria japonica). EMC was investigated at temperatures ranging from $100^{\circ}C$ to $160^{\circ}C$ and under saturated vapor pressures above 1 atm. The correlation between temperatures and vapor pressures have a good agreement with those observed by thermocouple and pressure gauge in the air state of autoclave, respectively. A sensitivity of quartz spring was 65mm/g. Moisture content(MC)s calculated from the quartz spring elongation by vapor sorption showed a good agreement with MCs by oven-dried method. Using this system, it was found that EMC at high vapor pressures and high temperatures above $100^{\circ}C$ were higher than EMC of wood in 1 atm pressure conditions. With this system, therefore, it was concluded that the EMCs of wood and wood-based materials at high temperatures were able to be evaluated.

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Acknowledgement

Supported by : 한국학술진흥재단