Printing – Processes – Specific ink
Reexamination Certificate
2001-11-14
2003-12-02
Evanisko, Leslie J. (Department: 2854)
Printing
Processes
Specific ink
C101S424100, C101S424200, C101S217000, C118S046000, C427S372200
Reexamination Certificate
active
06655288
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a method and apparatus for spot coating on printing substrates in large size printing machines producing printed images by application of an ink layer on the printing substrates.
BACKGROUND OF THE INVENTION
Spot coating on surfaces of printing substrates is usually made by printing plates, which are especially made for this purpose. These printing plates have partial recesses. This solution is described in the 9
th
edition of the book “Offsetdrucktechnik” (Offset printing) by Helmut Teschner on pages 11 to 43. This solution is not applicable for large size printing presses because the coating plates can not be manufactured in sufficient quality at such plate dimensions.
SUMMARY OF THE INVENTION
An object of the invention is to provide a method and apparatus for spot coating of printing substrates also applicable in large size printing presses.
“The present invention solves this and other problems by using a universally applicable offset plate to coat substantially the entire area of a printed image, wherein the coating reacts with ink layers of at least two ink systems thereby changing the printed image so that areas of varying gloss degrees are created. A printed offset plate may be used. The present invention uses a conventional printing press comprising at least two printing units for printing at least two ink systems, an optional dryer allocated to the printing units, and a coating unit for application of the final coating layer succeeding the printing units.”
An advantage of the present invention is that varying degrees of gloss can be produced using only a single coating plate without partial recesses. The manufacturing cost for the coating plates decreased. The coating plate can now be used for several printing jobs so that the make ready time is reduced. Furthermore, only one coating unit or coating tower is required.
REFERENCES:
patent: 4939992 (1990-07-01), Bird
patent: 5651316 (1997-07-01), DeMoore et al.
patent: 6299685 (2001-10-01), Siler et al.
patent: 6443058 (2002-09-01), Stadler et al.
Evanisko Leslie J.
Goodwin & Procter LLP
Hinze Leo T.
Koenig & Bauer AG
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