Author

Tripathi

Date of Award

4-2002

Degree Name

Master of Science

Department

Chemical and Paper Engineering

Department

Paper Engineering, Chemical Engineering and Imaging

First Advisor

Dr. Margaret K. Joyce

Second Advisor

Dr. John Cameron

Third Advisor

Dr. Dan Fleming

Access Setting

Masters Thesis-Open Access

Abstract

Coating rheology has long been understood to be a key factor in the smooth operation and performance of a coater. As coaters run faster and formulations become more complex, the demands on a coating's rheology grow more stringent.

Silica based coating formulations present unique rheological challenges, thus providing the opportunity for coating formulators to improve their performance through rheological studies under various conditions of shear. Due to rheological restrictions (gelling), silica based coatings are generally applied at 25-26% solids which is very low as compared to calcium carbonate or clay based coating, at 68-70% solids. Consequently, any improvement in coatings solids will lead to enormous savings in dryer energy. In this study the rheology of various silica-based coatings were characterized. The effect of three important coating parameters: total solids, pigment to binder ratio, and pigment type on rheology were studied.

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