Date of Award

4-1998

Degree Name

Master of Science

Department

Chemical and Paper Engineering

Department

Paper Engineering, Chemical Engineering and Imaging

First Advisor

Dr. Brian Scheller

Access Setting

Masters Thesis-Open Access

Abstract

Ink jet coating formulations are becoming of increasing importance due to rapid expansion in digital printing. These coatings have very specific ink absorption requirements, which are fulfilled by using polyvinyl alcohol and silica as binder and pigment, respectively. These coatings have unique rheological behavior and often have problems in industry during the filtering process. In this work, an attempt was made to relate filter blocking to the rheological behavior of the coating. A series of coatings were prepared and their rheological properties characterized. The solids content and pigment selection of the coating were altered in order to adjust the coating rheology. Pigments were adjusted by replacing silica with calcium carbonate and calcined clay in an attempt to increase the total coating solids and induce shear plugging during filtering. Additionally, the viscoelastic properties of several PVOH/Silica coatings and their components were characterized, to enable the interactive effects of the ink jet coatings to be better understood. Plugging during screening did not occur. However, actual industrial coating formulations are unknown, and the formulations tested may not match the industrial formulations being used. Plugging occurred only during runs where contamination took place, indicating other factors besides rheology may play a role.

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