Effects of Initial Calendering on Physical Properties of Recycled Pulp Handsheets

Sang-Don Sohn; Ki-Hyon Paik

Journal of Industrial and Engineering Chemistry, Vol.12, No.3, 460-468, May, 2006

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Effects of Initial Calendering on Physical Properties of Recycled Pulp Handsheets

Sang-Don Sohn, and Ki-Hyon Paik^{1, †}

Tullis Russell Coaters LTD., Ansan-city, Gyeonggi-do 425-110, Korea
¹Division of Environmental Science &Ecological Engineering, Korea University, Seoul, 136-701, Korea

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To investigate the effects of the initial calendering and recycling on the properties of pulp, handsheets were made from three kinds of pulp (SW-BKP, HW-BKP, and CTMP), calendered by two methods (conventional calendering, extreme calendering, and uncalendering as a control), and recycled up to the fifth cycle, and then their physical properties were measured. The tensile, tear, burst, and folding endurance of the initial handsheets (0 cycles) with SW-BKP decreased upon increasing the calendering temperature and pressure, whereas with HW-BKP these strengths increased. The corresponding properties for CTMP were located between these two extremes. Regardless of the kind of pulp, the apparent density and Scott internal bond increased, but the porosity, light scattering, and opacity all decreased, upon intensifying the calendering conditions. However, the zero-span tensile was unaffected by calendering. By cycling the initial handsheets up to the fifth recycle, all of the sheet strengths, with the exception of the tear for SW-BKP, decreased, regardless of the kind of pulp or the calendering conditions, but the porosity, opacity, and scattering all increased. The losses of these properties during recycling were accelerated by calendering for SW-BKP, but suppressed for HW-BKP and CTMP, when compared with their losses during uncalendering. The apparent density, opacity, light scattering, and zero-span for all three pulps were unaffected by calendering.

Keywords:recycled pulps;initial calendering;paper properties

[References]

Howard RC, J. Pulp Pap. Sci., 16, J143 (1990)
Howard RC, Bichrd W, J. Pulp Pap. Sci., 18, J151 (1992)
Sundberg A, Pranovich AV, Holmbom B, J. Pulp Pap. Sci., 29, 173 (2003)
Alber W, Erhard K, Reinhardt B, Wochenblatt fur Papierfabrikation, 128, 1308 (2000)
Moss PA, Retulainen E, J. Pulp Pap. Sci., 23, J382 (1997)
Hawes JM, Doshi MR, Recycled Paper Technology, Environment and Fiber Supply, pp. 253-262 TAPPI Press, Atlanta (1994)
Ahn BJ, Kondo R, Sakai K, Paik KH, J. Ind. Eng. Chem., 7(5), 285 (2001)
Gottsching L, Strumer L, Trans. BPBMA Symp., Fibre-Water Interactions in Papermaking, Vol. ll, pp. 877-897, London, U.K. (1978)
Gratton MF, The Recycling Potential of Calendered Newsprint Fibers, CPPA 1st Research Forum on Recycling (Toronto) Proc. pp. 65-79 (1991)
Jayme G, Wochenblatten fur Papierfabrikation, 42, 187 (1944)
Casey JP, Pulp and Paper, Vol. 3, p. 1880 John Wiley & Sons, Inc. (1981)
Charles SA, Waterhouse JF, The Effect of Surpercalendering on the Strength, PITA/PAPPI/CPPA Calendering and Supercalendering. Int Paper Physics Conf. (Mont-Rolland, P.Q), 177-184 (1987)
Gottsching L, Pakarinen H, Papermaking Science and Technology, p. 373 TAPPI Press (2000)
Sohn SD, Thesis D, Korea University, Seoul, Korea (1997)
Ellis RL, Sedlachek K, J. Tappi, 76, 143 (1993)
Yamagishi Y, Oye R, Japan Tappi, 35, 33 (1993)
Naazhad MM, J. Ind. Eng. Chem., 11, 341 (2005)
Chatterjee AM, Kortschot D, Roy N, Whitting P, J. Tappi, 76, 109 (1993)
Ferguson LD, Wochenblatt fur Papierfabrikation, 122, 132 (1994)
McKee RC, Paper Trade J., 155, 34 (1971)
Szwarcsztajn E, Przybysz K, Cell Chem. Technol., 10, 737 (1976)

[Referenced By]

[1] Howard RC, J. Pulp Pap. Sci., 16, J143 (1990)

[2] Howard RC, Bichrd W, J. Pulp Pap. Sci., 18, J151 (1992)

[3] Sundberg A, Pranovich AV, Holmbom B, J. Pulp Pap. Sci., 29, 173 (2003)

[4] Alber W, Erhard K, Reinhardt B, Wochenblatt fur Papierfabrikation, 128, 1308 (2000)

[5] Moss PA, Retulainen E, J. Pulp Pap. Sci., 23, J382 (1997)

[6] Hawes JM, Doshi MR, Recycled Paper Technology, Environment and Fiber Supply, pp. 253-262 TAPPI Press, Atlanta (1994)

[7] Ahn BJ, Kondo R, Sakai K, Paik KH, J. Ind. Eng. Chem., 7(5), 285 (2001)

[8] Gottsching L, Strumer L, Trans. BPBMA Symp., Fibre-Water Interactions in Papermaking, Vol. ll, pp. 877-897, London, U.K. (1978)

[9] Gratton MF, The Recycling Potential of Calendered Newsprint Fibers, CPPA 1st Research Forum on Recycling (Toronto) Proc. pp. 65-79 (1991)

[10] Jayme G, Wochenblatten fur Papierfabrikation, 42, 187 (1944)

[11] Casey JP, Pulp and Paper, Vol. 3, p. 1880 John Wiley & Sons, Inc. (1981)

[12] Charles SA, Waterhouse JF, The Effect of Surpercalendering on the Strength, PITA/PAPPI/CPPA Calendering and Supercalendering. Int Paper Physics Conf. (Mont-Rolland, P.Q), 177-184 (1987)

[13] Gottsching L, Pakarinen H, Papermaking Science and Technology, p. 373 TAPPI Press (2000)

[14] Sohn SD, Thesis D, Korea University, Seoul, Korea (1997)

[15] Ellis RL, Sedlachek K, J. Tappi, 76, 143 (1993)

[16] Yamagishi Y, Oye R, Japan Tappi, 35, 33 (1993)

[17] Naazhad MM, J. Ind. Eng. Chem., 11, 341 (2005)

[18] Chatterjee AM, Kortschot D, Roy N, Whitting P, J. Tappi, 76, 109 (1993)

[19] Ferguson LD, Wochenblatt fur Papierfabrikation, 122, 132 (1994)

[20] McKee RC, Paper Trade J., 155, 34 (1971)

[21] Szwarcsztajn E, Przybysz K, Cell Chem. Technol., 10, 737 (1976)