Moisture Transport in Paper

Sung-Hoon Yoon; Sang-Don Sohn; Byung-Chul Lee

Journal of Industrial and Engineering Chemistry, Vol.9, No.6, 647-654, November, 2003

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Moisture Transport in Paper

Sung-Hoon Yoon^†, Sang-Don Sohn¹, and Byung-Chul Lee²

Paper Research Division, Research Institute of Technology, Korea Minting and Security Pringting Corporation, Daejeon 305-713, Korea
¹Department of Paper Chemical Engineering, Graduate School of Information Industry, Hannam University, Daejeon 305-713, Korea
²Department of Chemical Engineering, College of Engineering, Hannam University, Daejeon 306-791, Korea

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The moisture transmission of handsheets prepared from unbleached kraft pulp and recycled newsprint paper were investigated experimentally with special attention focused on the effective moisture diffusion phenomena. A mathematical model for the effective diffusivity was developed to account for both gas-phase diffusion and solid-phase moisture movement in the paper. The contribution of solid-phase diffusion to the effective moisture diffusion was found to be 10 to 25% at a given void fraction point greater than 0.55. The effective moisture diffusivity largely depends on the relative humidity (RH) differences prevailing at the two opposite surfaces of the paper. The activation energy of water-vapor diffusion and water-vapor permeation of paper were 38.87 kJ/mol and 38.68 kJ/mol, respectively. The enthalpy of solution accompanied in the moisture transmission process in paper was determined to be -19 J/mol.

Keywords:moisture;effective diffusivity;handsheet;void fraction;activation energy;sorption enthalpy

[References]

Liang B, Fields RJ, King JC, Drying Tech., 8(4), 641 (1990)
Nielsson L, Wilhelmsson B, Stenstrom S, Drying Tech., 11(6), 1205 (1993)
Yoon SH, Lee BC, J. Korean Ind. Eng. Chem., 13(7), 666 (2002)
Casey JP, Pulp and Paper Chemistry and Chemical Technology, 3rd ed., Vol. 3, John Wiley & Sons, New York, 1889 (1981)
Winrich KM, TAPPI J., 54(8), 1302 (1971)
Bird RB, Stewart WE, Lightfoot EN, Transport Phenomena, 2nd ed., John Wiley & Sons, Inc., New York, 513 (2002)
Green DW, Maloney JO, Perrys Chemical Engineers Handbook, 6th ed., Section 3, 3-285, McGraw-Hill, New York (1984)
Baird PK, Irubesky CE, Tech. Assoc. Papers, 13, 274 (1930)
Yoon SH, Jeon Y, Park JM, Korea Tappi, 31(1), 61 (1999)
Radhakrishnan H, Chatterjee SG, Ramarao BV, J. Pulp Paper Sci., 26(4), 140 (2000)
Ahlen AT, TAPPI J., 53(7), 1320 (1970)
Stannett V, Szwarc M, Bhargava RL, Meyer JA, Myers AW, Rogers CE, Permeability of Plastic Films and Coated Paper to Gases and Vapors, Tappi Monograph Series (No. 23), Tappi Press, New York, 1 (1962)
VanKrevelen DW, Hoftyzer PJ, Properties of Polymers, 2nd ed., Elsevier Scientific Publicating Co., New York, 403 (1976)
Ziegler RD, TAPPI J., 43(11), 913 (1960)

[Related Articles]

[1] Liang B, Fields RJ, King JC, Drying Tech., 8(4), 641 (1990)

[2] Nielsson L, Wilhelmsson B, Stenstrom S, Drying Tech., 11(6), 1205 (1993)

[3] Yoon SH, Lee BC, J. Korean Ind. Eng. Chem., 13(7), 666 (2002)

[4] Casey JP, Pulp and Paper Chemistry and Chemical Technology, 3rd ed., Vol. 3, John Wiley & Sons, New York, 1889 (1981)

[5] Winrich KM, TAPPI J., 54(8), 1302 (1971)

[6] Bird RB, Stewart WE, Lightfoot EN, Transport Phenomena, 2nd ed., John Wiley & Sons, Inc., New York, 513 (2002)

[7] Green DW, Maloney JO, Perrys Chemical Engineers Handbook, 6th ed., Section 3, 3-285, McGraw-Hill, New York (1984)

[8] Baird PK, Irubesky CE, Tech. Assoc. Papers, 13, 274 (1930)

[9] Yoon SH, Jeon Y, Park JM, Korea Tappi, 31(1), 61 (1999)

[10] Radhakrishnan H, Chatterjee SG, Ramarao BV, J. Pulp Paper Sci., 26(4), 140 (2000)

[11] Ahlen AT, TAPPI J., 53(7), 1320 (1970)

[12] Stannett V, Szwarc M, Bhargava RL, Meyer JA, Myers AW, Rogers CE, Permeability of Plastic Films and Coated Paper to Gases and Vapors, Tappi Monograph Series (No. 23), Tappi Press, New York, 1 (1962)

[13] VanKrevelen DW, Hoftyzer PJ, Properties of Polymers, 2nd ed., Elsevier Scientific Publicating Co., New York, 403 (1976)

[14] Ziegler RD, TAPPI J., 43(11), 913 (1960)