A Fundamental Study on the Screenless Lithography : A View of the Mechanisms of Continuous Tone Reproduction

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The author approached the mechanisms of continuous tone reproduction in the screenless lithography from the side of sensitizing agents. A commonly used o-quinone diazide compound was adapted as sensitizing agent, with which a grainless cleaned aluminum sheet was coated. Effects of chemical and physical changes of the photosensitive coatings by UV rays irradiation on continuous tone reproduction were investigated by means of IR spectral analysis, wettability with water, profiling and micrographing the plate surfaces and densitometry of a printed color. In order to eliminate any undesirable factor for the subject, smooth-faced grainless aluminum plates were used as the substrates. The results are summarized as follows. 1) Ink receptivity and film thickness of photosensitive coatings after exposure and development decreased as the amount of exposure increased. 2)The structural changes of the coatings were micrographically observed as follows ; cracks appear at first, then follows a network construction, spots remain dispersed and eventually these spots disappear from the plate as the amount of exposure increased.
東京工芸大学の論文