Measurement field for determining the smearing limit during...

Printing – Planographic – Dampeners

Reexamination Certificate

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Details

C101S148000, C101S465000, C101S484000, C101SDIG045, C101SDIG046

Reexamination Certificate

active

08037816

ABSTRACT:
A measurement field allows determining the smearing limit during printing, in particular during lithographic wet offset printing. The measurement field is arranged on a printing form, in particular a printing plate, which has printing, ink-carrying regions and nonprinting, dampening solution-carrying regions on its surface. A dampening solution-carrying property in the region of the measurement field is reduced by a nanoscopic coating (e.g., with amphiphilic molecules) or an unscreened, microscopic coating (e.g., a polymer coating) in comparison with the dampening solution-carrying property in the nonprinting regions of the surface of the printing form. The nanoscopic coating or the microscopic coating advantageously leads to a shifting of the smearing limit, that is to say to a displacement of the starting point of scumming, by the dampening solution requirement which is increased for scum-free printing within the region of the measurement field. Such a measurement field is thus advantageously used for the closed-loop control of a dampening solution supply.

REFERENCES:
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patent: 6851366 (2005-02-01), Gutfleisch et al.
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German Search Report, dated Nov. 26, 2007.

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