Printing – Planographic – Dampeners
Reexamination Certificate
2008-06-27
2011-10-18
Zimmerman, Joshua D (Department: 2854)
Printing
Planographic
Dampeners
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.
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German Search Report, dated Nov. 26, 2007.
Gutfleisch Martin
Hauck Axel
Freeman Shema
Greenberg Laurence A.
Heidelberger Druckmaschinen AG
Locher Ralph E.
Stemer Werner H.
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