Curl Depending on Bending Moment and Drying Shrinkage

Won-Seok Nam; Jong-Moon Park; Ki-Hyon Paik

Journal of Industrial and Engineering Chemistry, Vol.12, No.4, 601-607, July, 2006

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Curl Depending on Bending Moment and Drying Shrinkage

Won-Seok Nam, Jong-Moon Park¹, and Ki-Hyon Paik^{2, †}

Samwha Paper Co. R&D, Cheoungwon 363-910, Korea
¹School of Forest Resources, Chungbuk National University, Cheongju 361-763, Korea
²Division of Environmental Science & Ecological Engineering, Korea University, Seoul 136-701, Korea

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The curl is an issue during paper coating processes, such as the cast coating process. The curl can be reduced simultaneously in the machine and cross machine directions (MD and CD, respectively) by bending drying with rewetting of one side. The bending moment and drying shrinkage induced by the rewetting process dictates the curl in the MD and CD. Bending in one direction cannot change the curl in the other direction without rewetting. One-directional bending with rewetting of one side can change the amount of curl in the other direction. The pre-curl also has an effect on the final curl. For a given sheet structure, the combination of bending moment and drying shrinkage decides the final curl shape.

Keywords:curl;cast-coated paper;rewetting;bending;drying;pre-curl

[References]

Glynn P, Jones HWH, Gallay W, Pulp Pap. Mag. Can., 60, T316 (1959)
Glynn P, Jones HWH, Gallay W, Pulp Paper Mag. Can., 62, T39 (1961)
Gallay W, TAPPI J., 56, 90 (1973)
Booth GB, Cast Coated Papers, ch. 3, Sect. V in The Coating Processes, J. P. Walter, Ed., p. 125, Tappi Press, New York (1993)
Timoshenko S, Goodier JN, Theory of Elasticity, 2nd Edn., p. 254, McGraw Hill, New York (1951)
Green C, Solutions, 11, 40 (2001)
Langevin ET, Giguere W, TAPPI J., 77, 105 (1994)
Akesson R, J. KTAPPI, 24, 66 (1992)
Nam WS, Ph. D. Thesis, Suny ESF, Syracuse, New York (1997)
Morris VAP, Sampson W, TAPPI J., 81, 191 (1998)
Edwards PJ, Murray AF, Papadopoulos G, Wallace AR, Barnnard J, Smith, TAPPI J., 82, 145 (1999)
Timofeev O, Keranen F, Kkiiskinen H, Pulp Pap. Can., 103, T204 (2002)
Lu W, Carlsson L, J. Pulp Pap. Sci., 27, 373 (2001)
Lim YJ, Paik KY, Nam WS, Abstracts Presented at the 27th Meeting, Korean Soc. Ind. Eng. Chem., 2LF-7, p. 84, Pusan, Korea (2003)
Nazhad MM, J. Ind. Eng. Chem., 11, 318 (2005)
Niskanen K, Paper Physics, Book 16 of Papermaking Science and Technology, 241, Fapet Oy, Helsinki, Finland (1998)
Paik KH, Nam WS, J. Pulp Pap. Sci., 27, 7 (2001)
Kalpakjian S, The Manufacturing Process for Engineering Materials 2nd Edn., p. 417, Addison Wesley (1991)

[Referenced By]

[1] Glynn P, Jones HWH, Gallay W, Pulp Pap. Mag. Can., 60, T316 (1959)

[2] Glynn P, Jones HWH, Gallay W, Pulp Paper Mag. Can., 62, T39 (1961)

[3] Gallay W, TAPPI J., 56, 90 (1973)

[4] Booth GB, Cast Coated Papers, ch. 3, Sect. V in The Coating Processes, J. P. Walter, Ed., p. 125, Tappi Press, New York (1993)

[5] Timoshenko S, Goodier JN, Theory of Elasticity, 2nd Edn., p. 254, McGraw Hill, New York (1951)

[6] Green C, Solutions, 11, 40 (2001)

[7] Langevin ET, Giguere W, TAPPI J., 77, 105 (1994)

[8] Akesson R, J. KTAPPI, 24, 66 (1992)

[9] Nam WS, Ph. D. Thesis, Suny ESF, Syracuse, New York (1997)

[10] Morris VAP, Sampson W, TAPPI J., 81, 191 (1998)

[11] Edwards PJ, Murray AF, Papadopoulos G, Wallace AR, Barnnard J, Smith, TAPPI J., 82, 145 (1999)

[12] Timofeev O, Keranen F, Kkiiskinen H, Pulp Pap. Can., 103, T204 (2002)

[13] Lu W, Carlsson L, J. Pulp Pap. Sci., 27, 373 (2001)

[14] Lim YJ, Paik KY, Nam WS, Abstracts Presented at the 27th Meeting, Korean Soc. Ind. Eng. Chem., 2LF-7, p. 84, Pusan, Korea (2003)

[15] Nazhad MM, J. Ind. Eng. Chem., 11, 318 (2005)

[16] Niskanen K, Paper Physics, Book 16 of Papermaking Science and Technology, 241, Fapet Oy, Helsinki, Finland (1998)

[17] Paik KH, Nam WS, J. Pulp Pap. Sci., 27, 7 (2001)

[18] Kalpakjian S, The Manufacturing Process for Engineering Materials 2nd Edn., p. 417, Addison Wesley (1991)