Patent ID: 9740103
Date: 2017-08-22
CPC Classifications: B41N,G03F

Claim:
1. A method of selectively exposing a liquid photopolymer printing blank to actinic radiation to create a relief image printing plate, wherein the liquid photopolymer printing blank is produced by the steps of (i) placing a negative of a relief image on a bottom glass and placing a coverfilm over the negative of the relief image, (ii) disposing a layer of liquid photopolymer on top of the coverfilm and negative of the relief image to a predetermined thickness, (iii) placing a backing sheet over the liquid photopolymer layer, and (iv) placing a top glass over the backing sheet, the method comprising the steps of: a. positioning a programmable screen between the top glass and an upper source of actinic radiation, wherein the programmable screen is programmed with an image file of a desired image; b. exposing the layer of liquid photopolymer to actinic radiation from the upper source of actinic radiation through the programmable screen for a period of time to crosslink and cure at least a portion of the layer of liquid photopolymer adjacent to the backing sheet and create a floor layer therein; and c. thereafter, imagewise exposing the layer of liquid photopolymer to actinic radiation from a lower source of actinic radiation through the bottom of the liquid photopolymer printing blank through the negative of the relief image to crosslink and cure selective portions of the layer of liquid photopolymer on the floor layer and create the relief image therein.