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Conference papers
Water & Air Ingress Into Paper Machine Circulating Oil, 19PaperCon

Water & Air Ingress Into Paper Machine Circulating Oil, 19PaperCon

Conference papers
Polyolefin Based Waterborne Barrier Coatings for Paperboard, 19PaperCon

Polyolefin Based Waterborne Barrier Coatings for Paperboard, 19PaperCon

Conference papers
Development of additive transfer and dosing system with straight forward steps improves cleanliness, quality and runnability, 19PaperCon

Development of additive transfer and dosing system with straight forward steps improves cleanliness, quality and runnability, 19PaperCon

Conference papers
Strength Development During Drying Possibilities with A Different Wet Strength Testing Approach, 19PaperCon

Strength Development During Drying Possibilities with A Different Wet Strength Testing Approach, 19PaperCon

Conference papers
Micro Characterization of z-resistance of papers, 19PaperCon

Micro Characterization of z-resistance of papers, 19PaperCon

Conference papers
Modelling of a Viscoelastic Compression Model for the Simulation of Mechanical Dewatering Processes, 19PaperCon

Modelling of a Viscoelastic Compression Model for the Simulation of Mechanical Dewatering Processes, 19PaperCon

Conference papers
Development of More Sustainable Barrier Technology for Packaging, 19PaperCon

Development of More Sustainable Barrier Technology for Packaging, 19PaperCon

Conference papers
Surface application of cellulose microfibrils on paper • Effects of basis weight and surface coverage levels, 19PaperCon

Surface application of cellulose microfibrils on paper • Effects of basis weight and surface coverage levels, 19PaperCon

Conference papers
Recycled Furnish Strength Enhancement via Enzyme Application to the Refiners • Mill Trial Results, 19PaperCon

Recycled Furnish Strength Enhancement via Enzyme Application to the Refiners • Mill Trial Results, 19PaperCon

Journal articles
Magazine articles
Open Access
Rheological characteristics of platy kaolin, TAPPI JOURNAL September 2019

ABSTRACT: Platy kaolin can provide significant value in the coating of paper and paperboard. It can be used in multiple applications and can provide benefits such as titanium dioxide (TiO2) extension, smoothness improvement, improved print gloss or ink set rates, calendering intensity reduction, and improved barrier properties. It is not a pigment that can be simply substituted for traditional hydrous kaolin without some adjustment to the coating formulation. These adjustments can be as simple as reducing solids, but may require binder changes as well. The coater setup may need to be adjusted because of the unique rheological behaviors these pigments exhibit.The unique rheological characteristics of platy kaolin are explored here. Measurements of the water retention of platy kaolin containing coatings confirm that water retention is not reduced in comparison to more blocky kaolin pigments, despite the lower coating solids at which they need to be run. This means that the rheological characteristics are the most important in understanding the runnability. An extensive analysis reveals some unique behaviors that need to be understood when utilizing these materials. Viscoelastic measurements indicate that, for this binder system, Tan d is mainly a function of solids. This may explain how weeping is initiated on a blade coater. The degree of shear thinning behaviors is investigated using the Ostwald de-Waele power law. The immobilization point was determined using the Dougherty-Krieger equation and related to the work of Weeks at the University of Maine on blade coater runnability. An indirect measure of particle shape and size synergy is also demonstrated using the Dougherty-Krieger equation parameters.

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