During the past three years, a number of photopolymer plates for flexographic printing have appeared on the market. The use of such a plate greatly simplifies flexographic platemaking by reducing the process to a level similar to that of a presensitized plate for offset lithography. A series of experiments were conducted to determine whether or not there were significant differences in the areas of half tone dots in different areas of the tonal scale on different types of flexographic plate materials all made from a single negative with a specially designed test object on it. Assuming significant differences were found in the dot areas among the various plates, we further wished to discover whether or not these differences would have a significant effect on the tones printed from these plates or whether differences would be overshadowed by the multitude of other press variables. Differences in the areas of halftone dots among the different types of printing plates were confirmed at the 95% level of statistical significance. Further, these differences were detectable in printed reproductions made from these plates, although other variables of flexographic printing had a much greater confirmed influence on tone reproduction.

Library of Congress Subject Headings

Printing plates, Photopolymer; Flexography

Publication Date


Document Type


Department, Program, or Center

School of Photographic Arts and Sciences (CIAS)


Not Listed


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Physical copy available from RIT's Wallace Library at Z252.5.F6 C36


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