Date of Award

4-2003

Degree Name

Master of Science

Department

Paper Engineering, Chemical Engineering and Imaging

First Advisor

Dr. Alexandra Pekarovicova

Second Advisor

Dr. Paul D. Fleming

Third Advisor

Dr. Margaret Joyce

Access Setting

Masters Thesis-Open Access

Abstract

The particle size of commercially produced printing inks available for each of the printing processes, such as letterpress, lithography, flexography, rotogravure and screen-printing was completed. The study of their stability on the press, as well as the examination of the effect of particle size on printability and color balance was investigated. This was demonstrated on several gravure and flexo printing trials lasting for several hours.

Decrease of rotogravure inks particle size was most obvious in black, while the decrease of particle size in all other colors was rather similar. Differences in color, print density, and specular gloss measured on printed substrates at the beginning of trial and after seven hours of printing were found. Color change, expressed by ∆E, was higher than 3.0 for each process color rotogravure ink. Such color difference can be observed with the human eye. Further measurements indicate that specular gloss increases with the decrease of the particle size. On the other hand, density mottle decreased with diminished particle size. The decrease of. particle size of Pantone Brown flexo water based spot color caused change in ∆E value of 3.2 color difference.

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