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Development of print plates in offset printers

A printing machine and printing mechanism technology, applied in the direction of lithographic rotary printing machine, printing machine, rotary printing machine, etc., can solve the problem of not being able to see the solution, and achieve the effect of reliable removal

Inactive Publication Date: 2009-01-28
HEIDELBERGER DRUCKMASCHINEN AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

A solution to this problem cannot be seen from patent document US 2007 / 0095232A1

Method used

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  • Development of print plates in offset printers
  • Development of print plates in offset printers
  • Development of print plates in offset printers

Examples

Experimental program
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Embodiment Construction

[0027] FIG. 1 depicts a sheet-fed offset printing press 1 with four printing units 2 . Each of the four printing units 2 is provided with an inking unit FAW and a dampening unit 14 . During the printing operation, printing ink is applied to the plate cylinder 5 in the printing unit 2 by the inking unit FAW via the ink roller 16 . In order to be able to influence the consistency of the printing ink in the inking unit FAW, each printing unit 2 also has a dampening unit 14 . The dampening unit 14 delivers dampening agent to the inking unit FAW so that the consistency of the ink can be changed thereby. The inking unit FAW and the dampening unit 14 can be pressed separately onto the plate cylinder 5, the dampening unit 14 and the inking unit FAW can also be pressed away from each other. The printing form cylinder carries a printing form 10 which contains the color separations for the corresponding printing unit 2 . The color separations on the printing plates 10 of the printing ...

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PUM

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Abstract

The present invention provides a method for developing printing plates in a printing press having at least one printing unit includes loading an imaged, undeveloped printing plate with dampening solution before a start of printing for dampening in at least one printing unit of the printing press for an active duration corresponding at least to one and one half times a time duration or number of machine revolutions provided before a start of printing when an already developed printing plate is used in the same printing press. A printing press for carrying out the method is also provided.

Description

technical field [0001] The invention relates to a device and a method for developing printing plates in a printing press having at least one printing unit. Background technique [0002] In offset printing presses, printing formes are provided in the individual printing units, which carry the printed image for a color separation. To apply a printing image on a printing plate, the printing plate is imaged according to color separations. The printing plate is imaged during an exposure process, which can be performed, for example, by means of a laser. Exposure by the printing plate changes the later printed or later non-printed areas. The unexposed and unimaged areas then have to be processed in a development step in order to finally produce different surface properties for the unimaged and imaged areas. In this case, after the development process, the unimaged areas are usually treated such that these areas are ink repellent, while the imaged areas of the printing plate are ...

Claims

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Application Information

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IPC IPC(8): B41C1/10B41N3/08B41F7/24
CPCB41C1/1075B41N3/08G03F7/3035
Inventor T·贝歇贝格尔M·迪策A·豪克N·普法伊费尔
Owner HEIDELBERGER DRUCKMASCHINEN AG
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