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Visual inspection apparatus for exposed forme

A visual inspection, exposed technology, used in printing plates, plate preparation, printing, etc., can solve problems such as inability to quantitatively distinguish visually

Inactive Publication Date: 2009-04-22
HEIDELBERGER DRUCKMASCHINEN AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is also not possible to visually discern quantitatively the difference in bias between the uncalibrated and calibrated state at the important 50% tone value

Method used

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  • Visual inspection apparatus for exposed forme
  • Visual inspection apparatus for exposed forme
  • Visual inspection apparatus for exposed forme

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0023] FIG. 1 shows a conventional inspection mark 1 which is visible on the printing plate 5 after exposure in the prepress stage. This check mark 1 , also known as a tonal value wedge, is used to check the process calibration in the prepress phase over the entire tonal value distribution range from 1 to 100%. To this end, the tonal values ​​are shown in gray scale (Graustufen), where the upper bar 11 shows the reference tonal value unaffected by the prepress process, while the lower bar running parallel thereto shows the calibrated The hue value is 12. In addition, in the upper area there is a tonal value scale 10, which indicates the tonal value in percent. Here, the tonal values ​​in the range of 10% to 90% are illustrated with 10% steps, while the tonal values ​​in the range of 1% to 10% and the polytone values ​​in the range of 90% to 100% are expanded from each other in order to be able to visually discern the albeit slight differences there.

[0024] FIG. 2 shows a ...

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PUM

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Abstract

The invention relates to a visual control device being applied during exposure of the printing plate. The visual control device in the form of at least one control marking is provided on an exposed printing plate for a printing press. The control marking includes at least two strips extending at least approximately in parallel, one of the strips depicting an uncalibrated tonal value profile around a defined halftone value, while another of the strips depicts the defined halftone value calibrated in the printing process. The control marking is provided with at least one region wherein the uncalibrated tonal value profile and the calibrated defined halftone value coincide visually in terms of color; and a printing plate provided with at least one of the control devices.

Description

technical field [0001] The invention relates to a device for visual inspection of exposed printing plates of a printing press, which is arranged on the printing plate in the form of at least one inspection mark when the printing plate is exposed. Background technique [0002] The printing process is basically divided into the pre-press stage, printing press and post-press processing. The aim of each printing process is to produce a print that follows the printed design as precisely as possible. A print can exist as an object as a print, but it can also exist digitally as an image file. The print image as an image file is digitally prepared in the prepress stage using a scanning image processor for printing, so that the data available thereafter are suitable for exposure of the printing plate of an offset printing press. In addition to the actual printed image, various markings and check areas are provided on the printing plate, which are located in the border area of ​​the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B41C1/00G03F5/00B41C1/10B41N1/00
CPCB41C1/1083B41N1/00
Inventor 安德烈亚斯·根贝
Owner HEIDELBERGER DRUCKMASCHINEN AG