Method of screen gravure photoengraving using a half-tone...

Details Method of screen gravure photoengraving using a half-tone... Method of screen gravure photoengraving using a half-tone...

G - Physics

03

C

96/17, 96/247

G03C 5/00 (2006.01) G03F 5/00 (2006.01) G03F 7/00 (2006.01)

Patent

CA 1078660

METHOD OF SCREEN GRAVURE PHOTOENGRAVING ABSTRACT OF THE DISCLOSURE An improved method of screen gravure photoengraving using a half-tone positive in which the gradation is fully represented by the variations of both sizes and depths of ink cells formed in the printing plate and the formation of moire pattern can be prevented without requiring strict registering in exposure steps, and the method comprises the steps of, for example, exposing photosensitive resist material such as a carbon resist to a light source through a gravure screen having transparent crosslines, further exposing the photosensitive resist material to the light source through a half-tone positive of the planographic type or relief type, again exposing to the light source by interposing a diffusion sheet between the half-tone positive and the photosensitive resist material, then transferring thus exposed photosensitive resist material on a gravure cylinder and carrying out developing and etching.

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