The occupation of dampening form rollers is to take up the wellspring arrangement consistently from the exchange or metering roller, exchange it to the printing frame and give a decent ink-wellspring arrangement emulsion . At the point when a hosing film is taken up by a hosing structure roller, the film is extended, as the dampening form rollers runs much speedier than the metering roller. Here, it is essential that part of the wellspring arrangement is emulsified in the ink. Dainty negative lines and structures in the picture are kept free of ink by the wellspring arrangement emulsified in the ink which is discharged, when the emulsion isolates under the weight of the plate roller.