Compressible printing blanket and method of manufacture

Abstract From the Canadian patent

Halftone printing is carried out by printing a first impression in entirely with a solid density of good render-ability from the middle-tone part to the light-tone part in a printed matter and printing at least a second impression, superposed over the first impression with a printing plate lightly, and supplementarily expressing only the parts of high dot density of the printed matter. A set of press plates for carrying out this printing process is also provided. A set of plates includes a first plate which has been contacted photoprinted with a screened film made from a transparent or reflecting original and at least a second plate adapted to express somewhat lightly and supplementarily …