Method of printing

Abstract

A method for printing on a substrate, wherein the substrate is printed upon with a plate-based printing process, particularly with an offset printing process, and with a plateless printing process, particularly with an inkjet printing process, inline with the plate-based printing process. According to the invention, a printing resolution of the plateless printing process is determined depending on a printing speed of the plate-based printing process.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This is a continuation application of Ser. No. 12 / 667,207, which was filed with the U.S. Patent and Trademark Office on 29 Dec. 2009, which in turn is a U.S. national stage of International Application No. PCT / EP2008 / 005063, filed on 24 Jun. 2008. Priority is claimed based on German Application No. 10 2007 030 374.4, filed on 29 Jun. 2007.FIELD OF THE INVENTION[0002]The invention is directed to a method of printing on a substrate with a plate-based and a plateless printing process inline with the plate based printing process.BACKGROUND OF THE INVENTION[0003]Inkjet printing units which do not use printing plates are increasingly used in printing plate-based printing presses, mainly printing presses working on the principle of offset printing, e.g., in web-fed rotary offset printing presses and sheet-fed printing presses. These plateless inkjet printing units are used particularly for individualizing printed products produced by offset prin...

AI Technical Summary

Benefits of technology

[0008]Consequently, it becomes possible to operate the plateless printing process at a higher printing speed than the maximum printing speed for which it is specified without the risk of distortion of the print image to be applied using the plateless printing process.

Problems solved by technology

As a result there are difficulties involved in inline printing on a substrate by offset printing and inkjet printing.

Although the printing speed of inkjet printing processes can be increased in this way, it has not been possible thus far in a web-fed rotary offset printing press designed, e.g., as a newspaper printing press operating at printing speeds for plate-based offset printing of up to 15 m / s to print on a substrate inline with a plateless inkjet printing process because the maximum achievable printing speed in conventional inkjet printing processes is 5 m / s.

Consequently, when printing on a substrate with a plate-based printing process and, inline with the plate-based printing process, with a plateless inkjet printing process, the print image applied by using the inkjet printing process is subject to distortion.

A similar problem occurs, for example, when laser printing is used as a plateless printing method.