Apparent slip velocity of paper coatings in viscometric flows

Kokko, Annaleena; Grankvist, T.; Triantafillopoulos, Nick

doi:10.3183/npprj-2000-15-05-p502-508

Nordic Pulp &Amp; Paper Research Journal

2000

DOI: 10.3183/npprj-2000-15-05-p502-508

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Apparent slip velocity of paper coatings in viscometric flows

Annaleena Kokko

T. Grankvist

Nick Triantafillopoulos³

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Depletion of coating color components in the blade coating process circulation

Rutanen¹,

Toivakka²

2011

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Coating color stability, as defined by changes in its solid particle fraction, is important for runnability, quality, and costs of a paper coating operation. This study sought to determine whether the size or density of particles is important in size segregation in a pigment coating process. We used a laboratory coater to study changes in coating color composition during coating operations. The results suggest that size segregation occurs for high and low density particles. Regardless of the particle density, the fine particle size fraction (<0.2 μm) was the most prone for depletion, causing an increase in the average size of the particles. Strong interactions between the fine particles and other components also were associated with a low depletion tendency of fine particles. A stable process and improved efficiency of fine particles and binders can be achieved by controlling the depletion of fine particles.

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Depletion of coating color components in the blade coating process circulation

Rutanen¹,

Toivakka²

2011

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Changes in solid particle fractions of coating color in low- and high-speed blade coating

Rutanen¹,

Toivakka²

2013

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Changes in coating color composition in a recirculation loop of a coater can cause runnability and paper quality variability. Besides an increase in the coating color solids content, the average size of the solid particles increases as a result of depletion of fine materials or shear-induced aggregation. The mechanisms for changes in solid particle fractions of coating colors and control parameters are not well understood or documented. Previous work has investigated the role of coating color solids content and cohesion energy in particle segregation tendencies by using a low-speed laboratory coater. The current work extends the study to high-speed pilot-scale coating and compares the results to the laboratory-scale coater. It is proposed that similar results in regard to particle size segregation can be observed with both a low-speed laboratory coater and a high-speed pilot coater. The same parameters, such as solids volume fraction, control the particle size segregation regardless of the speed and the applicator type. If the solids volume fraction and the packing volume are high, the coating color cohesion energy is not of importance for particle segregation.

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Apparent slip velocity of paper coatings in viscometric flows

Cited by 2 publications

References 0 publications

Depletion of coating color components in the blade coating process circulation

Depletion of coating color components in the blade coating process circulation

Changes in solid particle fractions of coating color in low- and high-speed blade coating

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