Patent ID: 8001895

Claim:
A zonal inking unit of a rotary printing press comprising: an ink fountain; an ink fountain roller adapted to receive a layer of ink, having a rheological behavior, from said ink fountain; a plurality of ink zones, each of a controllable ink thickness, on said ink fountain roller; an ink film roller ( 09 ) cooperating with said ink fountain roller to receive said ink in said ink zones and to provide said ink to a print substrate during passage of said print substrate through said rotary printing press at a transport speed at least up to 10 m/s, wherein the ink film roller ( 09 ) has a structured circumferential surface, the structured circumferential surface of the ink film roller ( 09 ) having a hardness of at least 60 Shore D, wherein the structured circumferential surface of the ink film roller ( 09 ) having irregularly distributed, open depressions ranging in depth from said surface to a depth of 50 μm to 400 μm, and formed as a stochastic structure by shot peening, said open depressions having a maximum width at said surface of said ink film roller, the open depressions on the structured circumferential surface of the ink film roller ( 09 ) forming a maximum vacant space having a ratio of 35% relative to a closed, smooth cylindrical surface of said film roller ( 09 ) and forming a relief, which relief is adapted to said rheological behavior on the ink to be transported by said ink film roller.