Four different types of surfaces of aluminum plates; 1) brush grained, 2) chemically grained, 3) brush grained and anodized, and 4) electrochemical ly grained and anodized substrates coated with polyvinyl oxazol, an organic photoconductor were studied. The experiments were divided into two parts. The first part concerned with the photoelectric characteristics of the various surfaces, and the second part was involved with image quality relative to photoelectric properties of different substrates. The characteristics of each of the surfaces was briefly discussed. Photoelectric properties such as 1) photosensitivity, 2) spectral response, 3) surface acceptance potential, 4) dark decay, 5) light decay, 6) retentivity, and 7) residual potential of the various surfaces of the aluminum substrates were reported. Image quality of a variety of plates in terms of 1) resolution of halftones and line patterns, 2) edge sharpness, 3) solid fill-in, 4) image density, and 5) cleanliness of non-image area were analyzed. The relationship of photoelectric properties vs. image quality of these surfaces was reported. Most of the experiments were repeated several times and the data were analyzed by statistical techniques, i.e., correlation, regression analysis, analysis of variance and multiple regression. The plates were not press tested. Under experimental conditions, the electrochemically grained and anodized surface exhibited the best photoelectric properties as well as image quality. The (electro-) chemical graining of the plates provided better photoelectric properties when compared to mechanical graining. Anodizing the plate surface further improved photoelectric characteristics. Image quality was related to the photoelectric performance of surfaces of the plates.
Library of Congress Subject Headings
Photocopying; Electrostatic printing; Electrophotography; Xerography
Department, Program, or Center
School of Media Sciences (CIAS)
Lee, Sung Jae, "Effect of Plate Surface Characteristics on Image Reproduction in Electrostatic Planographic Platemaking" (1983). Thesis. Rochester Institute of Technology. Accessed from
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