Patent ID: 8236479

Claim:
A method for printing a pattern of ink on a corrugated paperboard substrate comprising: a) providing a relief printing form from a photosensitive element comprising a photopolymerizable layer containing a binder, an ethylenically unsaturated compound and a photoinitiator, with steps comprising: i) forming an in-situ mask adjacent the photopolymerizable layer; ii) exposing the photopolymerizable layer to actinic radiation through the mask in an environment having an inert gas and a concentration of oxygen between 190,000 ppm and 100 ppm; and iii) treating the element from step ii) to form the relief printing form having a pattern of printing areas; b) securing the printing form onto or adjacent a print cylinder; c) applying the ink to the printing areas of the printing form; and d) contacting the ink from the printing areas to the substrate, thereby transferring the pattern of ink onto the substrate.