Process for printing a carrier material

Details Process for printing a carrier material Process for printing a carrier material

1998-12-14

2000-10-03

Funk, Stephen R.

Printing

Planographic

Processes of lithographic printing

101147, 101467, 101478, B41C 110, B41F 730

Patent

active

061257559

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention relates to a printing method for producing a print image on a carrier material, in which a print carrier is provided whose surface is charged with water vapor in a manner corresponding to the structure of the print image to be printed.
In known printing methods, such as the offset printing method, partial printing regions corresponding to the print image to be printed are provided on the surface of a print carrier, e.g. a print plate, a printing strip or a print master, which regions are inked with ink during the print process and subsequently print the carrier material with the ink. Various methods are known for the formation of these partial printing regions. For example, in the direct imaging method of the company Heidelberger Druckmaschinen, a print master is produced on a silicon-coated film by partially burning away the silicon layer, and the silicon-free locations accept the ink during the print process and print the carrier material. In another known method, hydrophobic and hydrophilic regions corresponding to the structure of the print image to be printed are produced on the print carrier. Before the application of ink to the print carrier, a thin film of moisture is first applied to the print carrier using application rollers or, respectively, spraying systems, which film wets the hydrophilic regions of the print carrier. Subsequently, using an ink roller, ink is applied to the surface of the print carrier, which however uses exclusively the regions not covered with a film of moisture. After the inking of the print carrier, the inked print image is finally transferred to the carrier material.
From U.S. Pat. No. 3,072,049 and U.S. Pat. No. 2,002,815, printing systems are known that respectively operate according to a printing method in which in order to produce the thin film of moisture on the surface of the print carrier, instead of using application rollers or spraying systems water vapor is applied to the hydrophilic regions of the print carrier. Here as well, the surface of the print carrier, which is charged with water vapor, is divided into hydrophobic and hydrophilic regions corresponding to the structures of the print image to be printed.
The printing methods described above all have in common that a print carrier has to be used on a surface of which raised and flat regions, or hydrophobic and hydrophilic regions, are provided corresponding to the structures of the print image to be printed.


SUMMARY OF THE INVENTION

An object of the invention is to provide a flexible printing method in which the print image to be printed can be modified in a simple manner.
This object is achieved by means of a printing method for production of a print image on a carrier material where a print carrier is provided, a surface of which is charged with water vapor at locations corresponding to structures of the print image to be printed. Water vapor is condensed at the locations corresponding to the structures of the print image as a film of water. Ink is applied to the surface, the ink adhering to non-wetted locations and not being accepted by the wetted locations. The ink is printed from the non-wetted locations onto the carrier material.
By means of the invention, a printing method is provided in which the surface of the print carrier is selectively and partially charged with water vapor in such a way that a partial water film that yields the print image forms on the surface. Given the use of this printing method, the use of a print carrier on whose surface hydrophilic and hydrophobic regions are provided can be dispensed with, so that additional operational steps are omitted. In place of the chemically pre-treated print carrier, the printing method with selective use of water uses a print carrier with a uniform surface onto which the film of water yielding the print image is applied. By this technique, it is possible to modify the print master within a print process, so that the printing method operates with very high flexibility.
In a further embodiment of this

REFERENCES:
patent: 2002815 (1935-05-01), Harrold
patent: 2101202 (1937-12-01), Stevens
patent: 3072049 (1963-01-01), Huebner
patent: 3800699 (1974-04-01), Carley
patent: 4010686 (1977-03-01), Harris
patent: 4188882 (1980-02-01), Jeschke et al.
patent: 4833990 (1989-05-01), Hirt et al.

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