Experimental Equilibrium Moisture Content of Wood Under Vacuum

Authors

  • Song-lin Yi
  • Yong-dong Zhou
  • Yu-rong Liu
  • Bi-guang Zhang
  • Xiao-jiang Feng

Keywords:

Vacuum drying, equilibrium moisture content (EMC)

Abstract

Wood equilibrium moisture content (EMC) was measured under vacuum by an electronic method. A wafer was used to measure EMC using an in-house designed vacuum instrument. EMC at 4 to 100 kPa and temperature from 30 to 90°C were measured. The relationships among temperature, pressure, and EMC were determined, and a diagram of wood EMC was produced. The results showed there are obvious differences between experimental EMC values obtained and theoretical EMC values of other researchers. It is suggested that corrections should be introduced into theoretical models or a new model for the vacuum condition developed.

References

Avramidis S (1989) Evaluation of "three-variable" models for prediction of equilibrium moisture content in wood. Wood Sci Technol 23(4):251-258.nChen ZJ (2002) Theoretical equilibrium moisture content of wood under vacuum. Wood Fiber Sci 34(4):553-559.nSimpson WT (1987) Vacuum drying northern red oak. Forest Prod J 37(1):35-38.nSimpson WT 1991. Dry Kiln Operator's Manual. Agric. Handbook AH-188. Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory. Pp 39nSimpson WT, Rosen HN (1981) Equilibrium moisture content of wood at high temperatures. Wood Fiber Sci 13(3):150-158.nZhu ZX (2003) EMC and Wood processing and its utilization. Chin Wood Panels 5:12-14.nZuritz C, Singh RP, Moini SM (1979) Desorption Isotherms of Rough Rice from 10°C to 40°C. Trans ASAE 22:433-440.n

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Published

2008-08-01

Issue

Number 3 / July 2008

Section

Research Contributions

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