Short inking unit for a rotary printing machine and method...

Details Short inking unit for a rotary printing machine and method... Short inking unit for a rotary printing machine and method...

B - Operations, Transporting

41

F

B41F 31/18 (2006.01) B41F 7/02 (2006.01) B41F 31/26 (2006.01)

Patent

CA 2387192

linking unit rolls include at least one ink applicator roll, which rotates in an ink fountain filled with printing ink and picks up printing ink from the latter, and a plate cylinder, which serves as a printing plate carrier and onto which ink can be transferred, directly or indirectly, by the ink applicator roll. The short inking unit is therefore equipped with a small number of inking unit rolls and, at the same time, nevertheless ensures a uniform, homogeneous application of ink to the plate cylinder, that is to say the ink splitting on ink-carrying rolls of a short inking unit for a rotary printing machine is improved. At least one of the inking unit rolls is provided, at least on its surface, with a coating having powerful microdipoles, in particular made of ferroelectric material. This circumferential surface is assigned electric means in order to produce an electric field by means of a DC/AC voltage, in order to polarize and depolarize the microdipoles of the circumferential surface in the form of a homogeneous or periodic charge image, so that an ink layer resting on it is given a desired electric roughness.

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