Patent ID: 8252513
Filing Date: 2012-08-28
Classification: B41C,G03F

Abstract:
1. A method of lithographically printing images on a receiving medium, comprising in order: (a) providing a lithographic printing plate comprising (i) a substrate, and (ii) a photosensitive layer soluble or dispersible in ink and/or fountain solution and capable of hardening upon exposure to a laser having a wavelength selected from 200 to 1200 nm; (b) imagewise exposing said plate with said laser to cause hardening of the photosensitive layer in the exposed areas; (c) developing said plate with ink and/or fountain solution on a lithographic press to remove the non-hardened areas of said photosensitive layer; and (d) lithographically printing images from said plate to the receiving medium; (e) wherein at least 90% in terms of time of said on-press development (step c) is performed with the plate under a first light that does not cause hardening of the photosensitive layer in the laser-non-exposed areas within at least 30 minutes; and at least 90% in terms of time of said lithographic printing (step d) is performed with the plate under a second light that is different from the first light in intensity and/or wavelength range.