Author

Lee

Date of Award

6-1999

Degree Name

Master of Science

Department

Chemical and Paper Engineering

Department

Paper Engineering, Chemical Engineering and Imaging

First Advisor

Dr. John Cameron

Second Advisor

Dr. Paul D. Fleming III

Access Setting

Masters Thesis-Open Access

Abstract

Aqueous-based coating for paper or paperboard applications use traditional coating pigments such as clay, calcium carbonate, and titanium dioxide. But, for matte coated ink jet papers, amorphous and gelled silicas are used due to their unique morphological properties, which are sponge-like in nature. The unique structure of these pigments provides an internal porosity and packing porosity which enables the rapid diffusion of liquid inks into the coating layer. The rapid uptake of the ink immobilizes the anionic dyes at the surface of the coating, allowing high optical print densities to be achieved.

The particle size of precipitated and gelled silicas is typically in the 3-16 μm range. Since particles of this size significantly reduce gloss, the use of these pigments in glossy ink jet media is hindered. Thus, they are primarily used in matte grades.

This study focuses on the use of fumed silica and aluminas in glossy ink jet media. The research described herein examines the contribution of silica chemistry, functionality and particles size on coating structure and coating structure influences on ink jet print quality.

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