Pitch Deposition in Newspring Mills Using Certain Kaolin Pigments, 1996 Papermakers Conference Proceedings

The use of calcined kaolin pigments to enhance the opacity and brightness in some newsprint-related papers is sometimes accompanied by a sharp increase in press section pitch deposition. This article reviews research reported in three previous papers that has led to the discovery of a new mechanism for pitch deposition. The cause of deposition appears to be tetrasodium pyrophosphate (TSPP), a dispersant which is widely used for stabilizing kaolin slurries. TSPP can liberate aluminum from the kaolin pigment into the aqueous phase of the slurry and also raise the pH to values above 6. Under these conditions, sticky aluminum soaps can form through the reaction of aluminum with the soap anions of fatty and resin acids present in paper machine white water. It should be possible to avoid this type of pitch deposition problem through the use of other dispersants.

Author: Allen, L. H., Truitt, R. E., Sennett, P. S., Sitholé, B. B., Lapointe, C. L.
Pitch Deposition in Newspring Mills Using Certain Kaolin Pig
Pitch Deposition in Newspring Mills Using Certain Kaolin Pigments, 1996 Papermakers Conference Proceedings
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