Journal of Korea Technical Association of The Pulp and Paper Industry (펄프종이기술)

Korea Technical Association of the Pulp and Paper Industry (한국펄프종이공학회)
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Molecular Diffusion of Water in Paper(III) -Theoretical analysis on vapor sorption properties of fiber surface -

종이내 수분확산 (제3보) -종이 표면의 수증기-흡습성에 관한 이론적 고찰-

  • Yoon, Sung-Hoon (Dept. of Forest Product Technology, College of Agriculture, Chungnam National University) ;
  • Jeon, Yang (Dept. of Forest Product Technology, College of Agriculture, Chungnam National University) ;
  • Park, Jong-Moon (School of Forest Resources, Chungbuk National University)
  • 윤성훈 (충남대학교 임산공학과) ;
  • 전양 (충남대학교 임산공학과) ;
  • 박종문 (충북대학교 산림과학부)
  • Published : 1999.03.01
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Abstract

The study aimed at the theoretical analysis of vapor sorption properties of, pp.rmaking fibers. Water vapor affinity and sorption thermodynamic properties of fiber constituents were evaluated based on Henry's law and Hildebrand's solubility theory. Theoretical equilibrium moisture content(ThEMC) on fiber surface was estimated using functional group contribution. Crystallinity of cellulose in fiber significantly controlled the water vapor solubility. Comparisons of the measured equilibrium moisture content data and the estimated ThEMC data coincidently suggested the fact that crystallinity of cellulose in fibers was around 60% to 70%. Carbohydrates constituents including amorphous cellulose and hemicellulose in fibers showed higher vapor solubility than lignin molecules. High correlation existed between ThEMC and vapor solubility as well as between ThEMC and solubility parameter. In the thermodynamic analysis on water-vapor sorption process in fibers, the sorption enthalpy increased as RH increased, whereas sorption entropy and free energy decreased with increasing RH.

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