Printing – Planographic – Lithographic plate making – and processes of making or using...
Reexamination Certificate
2001-07-05
2003-10-28
Funk, Stephen R. (Department: 2854)
Printing
Planographic
Lithographic plate making, and processes of making or using...
C101S401100, C101S425000, C101S467000, C101S478000
Reexamination Certificate
active
06637335
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to a method for imaging a surface, whereby the surface to be imaged contains image information of the preceding printing job. The printing machine has a least a printing form cylinder cooperating with an inking unit and possibly with a dampening unit and a blanket cylinder.
The invention also relates to an apparatus for imaging a surface in a printing press, where the printing machine has at least a printing form cylinder cooperating with an inking unit to be switched off and optionally with a dampening unit to be switched off, a blanket cylinder and an imaging unit for applying an image information carrying layer.
BACKGROUND OF INVENTION
A process for regenerating a preferably prior imaged printing form for offset printing is known from German patent No. 41 23 959 C1. The regeneration of the printing plate involves the image removal from the printing form and the making of the printing form surface hydrophilic. Applying an ionized process gas through an applying device regenerates the printing form. The image is reactively erased and is simulataneosuly made hydrophilic in one process step. A suction device removes the created gaseous products of this reaction.
The time consuming regeneration of the printing plate is undesirable.
SUMMARY DESCRIPTION OF INVENTION
It is an object of the invention to realize a process and an apparatus for a fast and low-cost regeneration of surfaces carrying image information in printing presses.
The object is solved according the invention by applying an ink receptive layer carrying the actual image information on the ink-repelling imaging surface within one operation. The existing image information from the preceding printing job is erased during this operation by a preceding erasing unit.
The advantage with this invention is the considerable reduction of make-ready time for printing presses.
REFERENCES:
patent: 3983813 (1976-10-01), Tani
patent: 4718340 (1988-01-01), Love, III
patent: 4846065 (1989-07-01), Mayrhofer et al.
patent: 5129321 (1992-07-01), Fadner
patent: 5148746 (1992-09-01), Fuller et al.
patent: 5644987 (1997-07-01), Eltgen
patent: 5713287 (1998-02-01), Gelbart
patent: 5943956 (1999-08-01), Marquez et al.
patent: 5996499 (1999-12-01), Gelbart et al.
patent: 6180325 (2001-01-01), Gelbart
Funk Stephen R.
Koenig + Bauer AG
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