| 摘要 |
Inking 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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