understand the origin and mass balance of wood pitch; what comes in to the process has to come out with paper web or waste water.
understand the complexity of pitch control; dissolved substances, conductivity, pH level, charge level, calcium level, bleaching history; all influence the strategy for the pitch control program.
recognise the most common pitch control chemistries.
To access this post, you must purchase All themes or Natural fibre products. Do you already have a membership or are you part of an organization? log in
Authors & references
Author:
Mari Zabihian, Kemira Oyj
References:
Zabihian, M., Lewis, C., Villanen, H., Rintala, J., “Management of Hydrophobic Particle Size for Improved Paper Machine Wet-end Stability” TAPPI PaperCon, April 22–25, 2012, New Orleans.
Fengel, D., Wegener, G., “Wood. Chemistry, ultrastructure, reactions”. De Gruyter, Berlin, New York 1989.
Back E., Allen, L.H., (eds.): “Pitch control, wood resin and deresination”. TAPPI PRESS, Atlanta 2000.
Ekman, R., Eckerman, C., Holmbom, B., “Studies on the behaviour of extractives in mechanical pulp suspensions”. Nord. Pulp Pap. Res. J. 5:2, 96–102 (1990).
Hannuksela, T., Qin, M., Holmbom, B., ”Physico-chemical characterisation of TMP resin and related model mixtures”, Colloids and Surfaces A: Physicochemical and Engineering Aspects 221, p. 243–254 (2003).
Thornton, J., “Dissolved and colloidal substances in the production of wood-containing paper”. Doctoral dissertation, Åbo Akademi, Turku (1993).
Zabihian, M., “Dissolved and colloidal substances (DCS) and their determination on a LWC –paper machine”. Master´s thesis, Åbo Akademi, Turku, Finland, 84 p (1995).
Sundberg, K., “Effect of wood polysaccharides on colloidal wood resin in papermaking”. Doctoral dissertation, Åbo Akademi, Turku (1995).
Bergelin, E., Holmbom, B., “Deresination of Birch Kraft Pulp in Bleaching”. JPPS, vol. 29 (1), p. 29–34 (2003).
McLean, D.S., Vercoe, D., Stack, K.R., Richardson, D., “The colloidal pKa of lipophilic extractives commonly found in Pinus radiate”, Appita Journal, 58 (5). pp. 362–366 (2005).
Sundberg, A., Strand, A., Vähäsalo, L., Holmbom, B., “Phase distribution of resin and fatty acids in colloidal wood pitch emulsions at different pH-levels”, J. Disp. Sci. Technol., 30(6), 912–919 (2009).
MacNeil, D., Sundberg, A., Vähäsalo, L., Holmbom, B., “Effect of Calcium on the Phase Distribution of Resin and Fatty Acids in Pitch Emulsions”, J. Disp. Sci., Technol, 32, 269–276 (2011).
Vähäsalo L., Holmbom B., “Effect of pH and calcium chloride on pitch in peroxide-bleached mechanical pulp suspensions”. Seventh European Workshop on lignocellulosics and Pulp, Turku/Åbo, Finland, August 26–29, 2002, 423–426.
Lee, R., Stack, KR., Richardson, DE., Lewis, TW., Garnier, G., “Aggregation studies of Pinus radiata wood extractives under increased system closure”. 65th Appita Annual Conference, 10-13 April, Rotorua, New Zealand (2011).
Sundberg, A., Ekman, R., Holmbom, B., Sundberg, K., Thornton, J., “Interactions between Dissolved and Colloidal Substances and a Cationic Fixing Agent in Mechanical Pulp Suspensions”, Nord. Pulp Pap. Res. J. 8:1, 226–231 (1993).
Zabihian, M., Sundberg, A., Holmbom, B., “Removal of Dissolved and Colloidal Substances from Mechanical Pulp Process Waters by Coagulation-Flocculation. Seventh European Workshop on Lignocellulosics and Pulp, Turku/Åbo, Finland August 26–29, p. 427–430 (2002).
Ruohomäki, K., “Selective deresination of pine and spruce TMP filtrates”. Master´s thesis, Lappeenranta University of Technology, 116 p, (2003).
McLean, DS., Stack, KR., Richardson, DE., “Evaluation of cationic polymers to control pitch deposition”. Appita Journal, 63 (3), pp. 199–205 (2010).
