EP2006090B1 - Method and device for imaging a gravure printing form - Google Patents

Method and device for imaging a gravure printing form Download PDF

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Publication number
EP2006090B1
EP2006090B1 EP08010659A EP08010659A EP2006090B1 EP 2006090 B1 EP2006090 B1 EP 2006090B1 EP 08010659 A EP08010659 A EP 08010659A EP 08010659 A EP08010659 A EP 08010659A EP 2006090 B1 EP2006090 B1 EP 2006090B1
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Prior art keywords
image
tiles
cells
border
ink
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EP08010659A
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German (de)
French (fr)
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EP2006090A3 (en
EP2006090A2 (en
Inventor
Sven Bruns
Andreas Scheffler
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Hell Gravure Systems GmbH and Co KG
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Hell Gravure Systems GmbH and Co KG
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Priority claimed from DE200710029099 external-priority patent/DE102007029099A1/en
Application filed by Hell Gravure Systems GmbH and Co KG filed Critical Hell Gravure Systems GmbH and Co KG
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Publication of EP2006090A3 publication Critical patent/EP2006090A3/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00—Forme preparation
    • B41C1/02—Engraving; Heads therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00—Inking and printing with a printer's forme
    • B41M1/10—Intaglio printing ; Gravure printing

Definitions

  • the invention relates to a method for imaging gravure printing forms according to the preamble of claim 1, and to a device for imaging a gravure printing form according to claim 12.
  • a method of directly engraving wells for receiving gravure ink in which wells of different sizes are engraved in the gravure form.
  • the cells are formed there from a predetermined number of engraved pixels.
  • the image data provided for imaging the intaglio are parcel-shaped in a continuous pattern composed of picture tiles, each corresponding to a screen mesh.
  • the raster meshes or image tiles comprise edge raster meshes or image tiles which, in contrast to inner raster meshes or image tiles, each contain an only partially formed cell.
  • some wells in the image border raster meshes or image tiles have very small cell volumes.
  • the leading or trailing laser pulses can have a different energy content, so that the engraving points or wells can also be smaller than the engraving points or wells in the interior of the contour. Further, the duration of a last laser pulse used to smooth the bottom of an engraving point or cup can be extended to make a puncture to the next engraving point or cup, without compromising the side dividers needed as support points for the inking blades. The punctures, however, run only in one direction.
  • the invention has for its object to improve the imaging of a gravure printing.
  • a Becoungschal für für für für für für für für für für für für für für für für für für für für für für für für für für für assupra is facilitated and / or automated and / or improved the gravure form of the printed image and / or improved contour acuity of the printed image can be obtained by improving the edge contours contributing wells in image border tiles even with a small cell volume of them recorded Deliver color reliably and completely to the substrate again.
  • the printed image can be printed easier, faster and more automated and analyzed when needed.
  • a respective image tile is constructed or selected such that it contains a well and / or parts of neighboring wells.
  • the printed image can be recorded and processed with advantage completely and completely by a suitable tiling data.
  • the invention provides that at least one only partially trained wells with at least one adjacent well, which itself could also be a Colournäpfchen, color connected, and that color-conducting connections are provided in different directions.
  • the well and the sub-well or two or more sub-wells together form a larger, optionally playfully designed cell or well system which can deliver the ink properly.
  • marginal cells cut off by an image edge are also formed as partial cells in the gravure form by circumstances of image data.
  • the partially formed cup being a peripheral cup cut off from a frame by circumstances of image data, which is introduced into the printing form only as a partially formed cup and itself has difficulties in dispensing the ink.
  • a color-conductive compound is produced with a complete well.
  • a preferred embodiment of the method according to the invention provides that, in the case of an image edge tile located on the edge of an image by circumstances of image data, the marginal parts of neighboring wells are formed as partial cells.
  • all peripheral parts of neighboring wells ie the partial cells lying in the vicinity of one edge, could be connected to one well completely covered by the image edge tile and / or to another part well or even to several wells or partial wells.
  • essentially rectangular picture tiles are preferably used.
  • Each image tile could then, for example, essentially capture the area of a raster mesh of a cell image raster.
  • Other polygonal image tile forms would of course be conceivable, for example, honeycomb shapes or diamond shapes, or even cornerless, for example, tongue-shaped picture tiles.
  • Each image tile preferably encompasses or comprises a central cup and, depending on the screen angle, substantially in diagonal directions of the image tile or in the direction of the respective screen angle to find parts of Nachbaräpfchen.
  • wells and / or partial wells are connected in pairs, but more wells or partial cells could also be connected to one another.
  • the provided connection options also make it possible to provide selection criteria for the respective preferred connection and / or depending on the situation, for example in the form of a selection algorithm.
  • a partial cell or an image tile is adjacent to an image edge
  • data processing technology recognized by preferably provided for imaging the gravure form image data by suppository-wise and / or pixel-wise environment comparison located on the edge of an image edge cups or parts thereof and / or image border tiles searched and these are identified by it.
  • the entire environment of a well, a sub-well and / or a pixel of a well or Operanäpfchens could be considered.
  • Main search directions can also be specified.
  • Such a method can also be performed self-learning, for example by preceding search sequences intelligently could be taken into account.
  • a gravure printing form according to the invention which is characterized in that it is imaged by the method according to the invention, as well as for an inventive device for imaging a gravure form, which forms wells in a gravure form, which is characterized in that it is a workable by the inventive method and / or for such a method established control, preferably programming or programmability, each claiming independent protection.
  • the method according to the invention could also be wholly or partly incorporated in a software with which the respective print job conditions can be specified.
  • the figure shows only schematically and by way of example a possible section of a raster image of wells.
  • the wells are indicated as diamonds 1, 2a, 2b.
  • the boundaries of which are indicated by dashed lines 5 and with which the raster image is recorded in a parquet manner.
  • cups 2b are severed, part of which would be outside the image edge. From such cups 2b therefore only that part is respectively formed in a printing form, preferably engraved, which lies within the image in order to draw as sharply as possible the image contour corresponding to the image edge course.
  • each image tile includes, for example, a central well 1 and, in the corner regions of the image tile, a quarter of a neighboring well.
  • the image tiles 3 are image edge tiles, which adjoin the image edge 6, 7 and therefore also include sub-cells of peripheral wells 2b. They also include wells 2a, which belong to several picture tiles 3, 4. Picture tiles 4 are inner picture tiles, which in their corner areas have only inner sub-cells of cells 2a belonging to several picture tiles. These inner cups 2a are formed completely on the printing form in the interaction of the picture tiles 3, 4.
  • image data are checked to see which image tiles are image edge tiles 3 and thus have edge cups 2b.
  • Such Randnäpfchen 2b are then connected color-conductive by additional color channels 8 and Näpfchen barnstiche with the respective central cup of the picture edge tile so as to produce a Rescuenäpfchen that can deliver the color of the Randnäpfchen properly.
  • These color channels are thus generated in the printing form in the imaging with, preferably engraved with. If appropriate, a respective color channel 8 for the connection of a Sectionnäpfchens 2b with a central cup 1 is sufficient.

Abstract

The method involves providing rhomboid shape central cups (1, 2a, 2b) of different dimensions to image a rotogravure form to achieve different tone values or print densities by engraving. Image data for imaging the rotogravure form is assembled from image tiles (3, 4) e.g. polygonal image tiles, by a controller, where some of the image tiles contain a partial cup formed by a portion of adjacent central cups. The partial cup is connected with the central cups by an ink channel (8) in an ink-conducting manner. An independent claim is also included for a system for imaging of a rotogravure form.

Description

Die Erfindung betrifft ein Verfahren zur Bebilderung von Tiefdruckformen gemäß dem Oberbegriff des Anspruchs 1, sowie eine Vorrichtung zur Bebilderung einer Tiefdruckform gemäß Anspruch 12.The invention relates to a method for imaging gravure printing forms according to the preamble of claim 1, and to a device for imaging a gravure printing form according to claim 12.

Aus der EP 1 568 490 A1 ist ein Verfahren zur direkten Gravur von Näpfchen zur Aufnahme von Druckfarbe für den Tiefdruck bekannt, bei dem Näpfchen unterschiedlichen Ausmaßes in die Tiefdruckform graviert werden. Die Näpfchen werden dort aus einer vorbestimmten Anzahl von gravierten Bildpunkten gebildet. Die zur Bebilderung der Tiefdruckform vorgesehenen Bilddaten werden parkettartig in einem lückenlosen Muster aus Bildkacheln zusammengesetzt, die jeweils einer Rastermasche entsprechen. Die Rastermaschen oder Bildkacheln umfassen Bildrand-Rastermaschen oder Bildkacheln, die im Unterschied zu inneren Rastermaschen oder Bildkacheln jeweils ein nur teilweise ausgebildetes Näpfchen enthalten. Dadurch weisen jedoch einige Näpfchen in den Bildrand-Rastermaschen oder Bildkacheln sehr geringe Näpfchenvolumina auf.From the EP 1 568 490 A1 For example, a method of directly engraving wells for receiving gravure ink is known in which wells of different sizes are engraved in the gravure form. The cells are formed there from a predetermined number of engraved pixels. The image data provided for imaging the intaglio are parcel-shaped in a continuous pattern composed of picture tiles, each corresponding to a screen mesh. The raster meshes or image tiles comprise edge raster meshes or image tiles which, in contrast to inner raster meshes or image tiles, each contain an only partially formed cell. As a result, however, some wells in the image border raster meshes or image tiles have very small cell volumes.

Allerdings geben Näpfchen in einer Tiefdruckform, ab einem bestimmten Mindestvolumen oder kleiner, die von ihnen aufgenommene Farbe nicht zuverlässig und / oder vollständig an den Bedruckstoff wieder ab. Dies hängt einerseits beispielsweise von dem Näpfchenvolumen, andererseits aber zum Beispiel auch von der Konsistenz der Farbe, insbesondere ihrer Viskosität, ab. Hierdurch kann es zu einem fehlerhaften Ausdruck kommen, der in Tonwertverläufen auffällig und unerwünscht ist, aber auch in Randkonturen eines Bildes, da eine solche Kontur dann beispielsweise ausgefranst erscheinen könnte. Dies gilt insbesondere gleichermaßen beim Publikationsdruck wie beim Verpackungsdruck.However, wells in a gravure form, from a certain minimum volume or smaller, do not reliably and / or completely release the ink picked up by them from the substrate. On the one hand, this depends, for example, on the well volume, but on the other hand, for example, also on the consistency of the color, in particular its viscosity. This can lead to an erroneous expression, which is conspicuous and undesirable in tonal gradients, but also in edge contours of an image, since such a contour could then appear frayed, for example. This is especially true for publication printing as well as packaging printing.

Aus der DE 43 38 337 C1 ist ein Verfahren der eingangs genannten Art zur Lasergravur bekannt, bei dem Bilddaten parkettartig in einem lückenlosen Rasternetz oder Muster aus Rastermaschen so angeordnet werden, dass die Gravierpunkte oder Näpfchen mit ihren Zentren auf den Schnittpunkten des Rasternetzes liegen. Da die einzelnen Gravierpunkte nur vom Rastemetz vorherbestimmte Positionen einnehmen können, hat bei der Darstellung einer ungeradlinigen Kontur jede schräg verlaufende Kontur einen unruhig und gezackt verlaufenden Rand. Dies lässt sich durch zusätzliche, in Gravierrichtung vor- oder nacheilende Laserimpulse vermeiden, wodurch die Gravierpunkte oder Näpfchen mindestens teilweise in Gravierrichtung aus den Schnittpunkten des Rasternetzes heraus verschoben werden. Die vor- oder nacheilenden Laserimpulse können einen unterschiedlichen Energieinhalt besitzen, so dass die Gravierpunkte oder Näpfchen auch kleiner als die Gravierpunkte oder Näpfchen im Inneren der Kontur sein können. Weiter kann die Dauer eines zur Glättung des Bodens eines Gravurpunkts oder Näpfchens dienenden letzten Laserimpulses verlängert werden, um einen Durchstich zum nächst folgenden Gravierpunkt oder Näpfchen herzustellen, ohne dass dabei die seitlichen Trennstege beeinträchtigt werden, welche als Stützpunkte für die Farbrakel benötigt werden. Die Durchstiche verlaufen jedoch nur in einer Richtung.From the DE 43 38 337 C1 a method of the type mentioned above for laser engraving is known, are arranged in the image data parquet in a seamless grid network or pattern of raster meshes so that the engraving points or wells lie with their centers on the intersections of the grid network. Since the individual engraving points can only assume predetermined positions from the detent net, each oblique contour has an uneven and jagged edge in the representation of an odd-line contour. This can be avoided by additional, in the direction of engraving or lagging laser pulses, whereby the engraving points or cups are at least partially moved in the direction of engraving from the intersections of the grid network out. The leading or trailing laser pulses can have a different energy content, so that the engraving points or wells can also be smaller than the engraving points or wells in the interior of the contour. Further, the duration of a last laser pulse used to smooth the bottom of an engraving point or cup can be extended to make a puncture to the next engraving point or cup, without compromising the side dividers needed as support points for the inking blades. The punctures, however, run only in one direction.

Der Erfindung liegt die Aufgabe zugrunde, die Bebilderung einer Tiefdruckform zu verbessern. Dabei soll vorzugsweise eine Bebilderungsdatenverarbeitung erleichtert und / oder automatisiert werden und / oder die Tiefdruckform in ihrem Ausdruckverhalten verbessert werden und / oder eine verbesserte Konturenschärfe des ausgedruckten Druckbildes erzielt werden, indem zur Verbesserung der Randkonturen beitragende Näpfchen in Bildrandkacheln selbst bei kleinem Näpfchenvolumen die von ihnen aufgenommene Farbe wieder zuverlässig und vollständig an den Bedruckstoff abgeben.The invention has for its object to improve the imaging of a gravure printing. In this case preferably a Bebilderungsdatenverarbeitung is facilitated and / or automated and / or improved the gravure form of the printed image and / or improved contour acuity of the printed image can be obtained by improving the edge contours contributing wells in image border tiles even with a small cell volume of them recorded Deliver color reliably and completely to the substrate again.

Diese Aufgabe wird erfindungsgemäß in Verfahrenshinsicht durch die Merkmale des Anspruchs 1 gelöst.This object is achieved according to the invention in process view by the features of claim 1.

Das auszudruckende Druckbild kann dadurch einfacher, schneller und automatisierter aufgebaut und auch bei Bedarf analysiert werden.The printed image can be printed easier, faster and more automated and analyzed when needed.

Vorzugsweise ist erfindungsgemäß eine jeweilige Bildkachel so aufgebaut oder gewählt, dass sie ein Näpfchen und / oder Teile von Nachbarnäpfchen enthält. Mit derartigen Bildkacheln kann das Druckbild mit Vorteil vollständig und lückenlos durch eine geeignete Parkettierung datentechnisch erfasst und aufbereitet werden.Preferably, according to the invention, a respective image tile is constructed or selected such that it contains a well and / or parts of neighboring wells. With such image tiles, the printed image can be recorded and processed with advantage completely and completely by a suitable tiling data.

Damit auch die nur teilweise ausgebildeten Näpfchen, die beispielsweise zur Verbesserung einer Kontur beitragen, sachgerecht ausgedruckt werden, ist erfindungsgemäß vorgesehen, dass wenigstens ein nur teilweise ausgebildetes Näpfchen mit wenigstens einem benachbarten Näpfchen, das selber auch ein Teilnäpfchen sein könnte, farbleitend verbunden wird, und dass in unterschiedlichen Richtungen farbleitende Verbindungen vorgesehen sind. Auf diese erfindungsgemäße Weise bilden das Näpfchen und das Teilnäpfchen oder zwei oder mehrere Teilnäpfchen zusammen ein größeres, gegebenenfalls bizarrer ausgebildetes Näpfchen oder Näpfchensystem, das die Farbe sachgerecht abgeben kann.Thus, the only partially trained wells that contribute, for example, to improve a contour are printed properly, the invention provides that at least one only partially trained wells with at least one adjacent well, which itself could also be a Teilnäpfchen, color connected, and that color-conducting connections are provided in different directions. In this way according to the invention, the well and the sub-well or two or more sub-wells together form a larger, optionally bizarrely designed cell or well system which can deliver the ink properly.

Vorzugsweise werden erfindungsgemäß auch durch Gegebenheiten von Bilddaten durch einen Bildrand abgeschnittene Randnäpfchen als Teilnäpfchen in der Tiefdruckform ausgebildet. Auch dies kann dann dazu führen, dass das teilweise ausgebildete Näpfchen ein durch Gegebenheiten von Bilddaten durch einen Bildrand abgeschnittenes Randnäpfchen ist, welches nur als teilweise ausgebildetes Näpfchen in die Druckform eingebracht wird und selbst Schwierigkeiten bei der Farbabgabe hat. Auch dazu ist erfindungsgemäß bevorzugt vorgesehen, dass eine farbleitende Verbindung mit einem vollständigen Näpfchen hergestellt wird.Preferably, according to the invention, marginal cells cut off by an image edge are also formed as partial cells in the gravure form by circumstances of image data. This, too, can then lead to the partially formed cup being a peripheral cup cut off from a frame by circumstances of image data, which is introduced into the printing form only as a partially formed cup and itself has difficulties in dispensing the ink. Also according to the invention it is preferably provided that a color-conductive compound is produced with a complete well.

Eine bevorzugte Ausführungsform des erfindungsgemäßen Verfahrens sieht vor, dass bei einer durch Gegebenheiten von Bilddaten an einem Bildrand gelegenen Bildrandkachel die randseitigen Teile von Nachbarnäpfchen als Teilnäpfchen ausgebildet werden. Insbesondere könnten erfindungsgemäß zur Vermeidung isolierter Teilnäpfchen nötigenfalls alle randseitigen Teile von Nachbarnäpfchen, also die Teilnäpfchen, die in Nachbarschaft eines Randes liegen, mit einem von der Bildrandkachel vollständig erfassten Näpfchen und / oder mit einem anderen Teilnäpfchen oder auch mit mehreren Näpfchen oder Teilnäpfchen verbunden werden.A preferred embodiment of the method according to the invention provides that, in the case of an image edge tile located on the edge of an image by circumstances of image data, the marginal parts of neighboring wells are formed as partial cells. In particular, according to the invention, in order to avoid isolated partial cells, all peripheral parts of neighboring wells, ie the partial cells lying in the vicinity of one edge, could be connected to one well completely covered by the image edge tile and / or to another part well or even to several wells or partial wells.

Bevorzugt werden erfindungsgemäß einfach im Wesentlichen rechteckige Bildkacheln verwendet. Jede Bildkachel könnte dann zum Beispiel im Wesentlichen den Bereich einer Rastermasche eines Näpfchenbildrasters erfassen. Auch andere polygone Bildkachelformen wären natürlich denkbar, zum Beispiel Wabenformen oder Rautenformen, oder auch eckenlose, zum Beispiel zungenförmige Bildkacheln.According to the invention, essentially rectangular picture tiles are preferably used. Each image tile could then, for example, essentially capture the area of a raster mesh of a cell image raster. Other polygonal image tile forms would of course be conceivable, for example, honeycomb shapes or diamond shapes, or even cornerless, for example, tongue-shaped picture tiles.

Jede Bildkachel erfasst bzw. umfasst vorzugsweise ein zentrales Näpfchen und, je nach Rasterwinkel, im Wesentlichen etwa in Diagonalrichtungen der Bildkachel bzw. in Richtung des jeweiligen Rasterwinkels zu findende Teile von Nachbarnäpfchen.Each image tile preferably encompasses or comprises a central cup and, depending on the screen angle, substantially in diagonal directions of the image tile or in the direction of the respective screen angle to find parts of Nachbaräpfchen.

Bevorzugt werden Näpfchen und / oder Teilnäpfchen bei Bedarf paarweise verbunden, es könnten aber auch mehr Näpfchen oder Teilnäpfchen miteinander verbunden werden. Insbesondere ist es durch die vorgesehenen Verbindungsoptionen auch möglich Auswahlkriterien für die jeweils bevorzugte Verbindung und / oder je nach Situation vorzusehen, beispielsweise in Form eines Auswahlalgorithmus.If desired, wells and / or partial wells are connected in pairs, but more wells or partial cells could also be connected to one another. In particular, the provided connection options also make it possible to provide selection criteria for the respective preferred connection and / or depending on the situation, for example in the form of a selection algorithm.

Ob ein Teilnäpfchen oder eine Bildkachel einem Bildrand benachbart sind, könnte erfindungsgemäß vorzugsweise automatisch, datenverarbeitungstechnisch erkannt werden, indem bevorzugt zur Bebilderung der Tiefdruckform vorgesehene Bilddaten durch näpfchenweisen und / oder pixelweisen Umgebungsvergleich auf randseitig eines Bildrandes gelegene Näpfchen oder Teile davon und / oder Bildrandkacheln durchsucht und diese dadurch identifiziert werden. Hierzu könnte die gesamte Umgebung eines Näpfchens, eines Teilnäpfchens und / oder eines Pixel eines Näpfchens oder Teilnäpfchens betrachtet werden. Es können auch Hauptsuchrichtungen vorgegeben werden. Ein solches Verfahren kann auch selbstlernend durchgeführt werden, indem zum Beispiel vorhergehende Suchabfolgen intelligent berücksichtigt werden könnten.Whether a partial cell or an image tile is adjacent to an image edge, according to the invention, preferably automatically, data processing technology recognized by preferably provided for imaging the gravure form image data by suppository-wise and / or pixel-wise environment comparison located on the edge of an image edge cups or parts thereof and / or image border tiles searched and these are identified by it. For this purpose, the entire environment of a well, a sub-well and / or a pixel of a well or Teilnäpfchens could be considered. Main search directions can also be specified. Such a method can also be performed self-learning, for example by preceding search sequences intelligently could be taken into account.

Für eine erfindungsgemäße Tiefdruckform die sich dadurch auszeichnet, dass sie nach dem erfindungsgemäßen Verfahren bebildert ist, so wie für eine erfindungsgemäße Vorrichtung zur Bebilderung einer Tiefdruckform, welche Näpfchen in einer Tiefdruckform ausbildet, die sich dadurch auszeichnet, dass sie eine nach dem erfindungsgemäßen Verfahren arbeitsfähige und / oder für ein solches Verfahren eingerichtete Steuerung, vorzugsweise Programmierung oder Progammierbarkeit, aufweist, wird jeweils auch selbständiger Schutz beansprucht. Insbesondere könnte das erfindungsgemäße Verfahren auch ganz oder teilweise in eine Software inkorporiert sein, mit der die jeweiligen Druckjobbedingungen vorgegeben werden können.For a gravure printing form according to the invention which is characterized in that it is imaged by the method according to the invention, as well as for an inventive device for imaging a gravure form, which forms wells in a gravure form, which is characterized in that it is a workable by the inventive method and / or for such a method established control, preferably programming or programmability, each claiming independent protection. In particular, the method according to the invention could also be wholly or partly incorporated in a software with which the respective print job conditions can be specified.

Ein erfindungsgemäßer Randabschnitt eines Bildausschnittes, an dem das erfindungsgemäße Verfahren noch einmal zum Teil erläutert wird, ist in der einzigen Zeichnungsfigur dargestellt. Aus dieser Zeichnung können sich auch weitere erfinderische Merkmale ergeben, jedoch soll die Erfindung in ihrem Umfang nicht auf dieses Ausführungsbeispiel beschränkt sein.An inventive edge section of a picture detail, on which the method according to the invention is explained again in part, is shown in the single drawing figure. From this drawing, further inventive features may arise, but the invention should not be limited in scope to this embodiment.

Die Figur zeigt nur schematisch und beispielhaft einen möglichen Ausschnitt aus einem Rasterbild aus Näpfchen. Die Näpfchen sind als Rauten 1, 2a, 2b angedeutet. Jeweils mit einem zentralen Näpfchen 1 in der Mitte sind rechteckige Bildkacheln 3, 4 gebildet worden, deren Grenzen mit gestrichelten Linien 5 angedeutet sind und mit denen das Rasterbild parkettartig erfasst ist.The figure shows only schematically and by way of example a possible section of a raster image of wells. The wells are indicated as diamonds 1, 2a, 2b. In each case with a central cup 1 in the middle rectangular picture tiles 3, 4 have been formed, the boundaries of which are indicated by dashed lines 5 and with which the raster image is recorded in a parquet manner.

Zudem ist ein Eckbereich eines Bildrandes mit durchgezogenen Linien 6, 7 in der Zeichnung angedeutet worden.In addition, a corner region of an image edge has been indicated by solid lines 6, 7 in the drawing.

Durch den Verlauf des Bildrandes 6, 7 sind Näpfchen 2b durchtrennt, von denen ein Teil außerhalb des Bildrandes liegen würde. Von derartigen Näpfchen 2b wird daher in einer Druckform nur derjenige Teil jeweils ausgebildet, vorzugsweise graviert, der innerhalb des Bildes liegt, um die Bildkontur entsprechend des Bildrandverlaufs möglichst scharf zu zeichnen.Through the course of the image edge 6, 7 cups 2b are severed, part of which would be outside the image edge. From such cups 2b therefore only that part is respectively formed in a printing form, preferably engraved, which lies within the image in order to draw as sharply as possible the image contour corresponding to the image edge course.

Zu jeder Bildkachel gehört, wie bereits erwähnt, hier beispielhaft ein zentrales Näpfchen 1 und jeweils in den Eckbereichen der Bildkachel ein Viertel eines Nachbarnäpfchens.As already mentioned, each image tile includes, for example, a central well 1 and, in the corner regions of the image tile, a quarter of a neighboring well.

Die Bildkacheln 3 sind Bildrandkacheln, die an den Bildrand 6, 7 angrenzen und daher auch Teilnäpfchen von Randnäpfchen 2b umfassen. Sie umfassen auch Näpfchen 2a, die zu mehreren Bildkacheln 3, 4 gehören. Bildkacheln 4 sind innere Bildkacheln, die in ihren Eckbereichen nur innere, zu mehreren Bildkacheln gehörende Teilnäpfchen von Näpfchen 2a aufweisen. Diese inneren Näpfchen 2a werden im Zusammenspiel der Bildkacheln 3, 4 vollständig auf der Druckform ausgebildet.The image tiles 3 are image edge tiles, which adjoin the image edge 6, 7 and therefore also include sub-cells of peripheral wells 2b. They also include wells 2a, which belong to several picture tiles 3, 4. Picture tiles 4 are inner picture tiles, which in their corner areas have only inner sub-cells of cells 2a belonging to several picture tiles. These inner cups 2a are formed completely on the printing form in the interaction of the picture tiles 3, 4.

Die Randnäpfchen 2b werden aber nur, wie gesagt, teilweise ausgebildet, soweit sie innerhalb des Bildrandes 6, 7 liegen. Damit entstehen Kleinnäpfchenbereiche, die Schwierigkeiten haben, Farbe an einen Bedruckstoff abzugeben.The Randääpfchen 2b but only partially, as I said, as far as they are within the image edge 6, 7. This creates small bowl areas that have difficulty dispensing paint to a substrate.

Erfindungsgemäß werden daher Bilddaten daraufhin überprüft, welche Bildkacheln Bildrandkacheln 3 sind und somit Randnäpfchen 2b aufweisen. Derartige Randnäpfchen 2b werden dann farbleitend durch zusätzliche Farbkanäle 8 bzw. Näpfchendurchstiche mit dem jeweils zentralen Näpfchen der Bildrandkachel verbunden, um so ein Gesamtnäpfchen zu erzeugen, das insgesamt auch die Farbe aus den Randnäpfchen sachgerecht abgeben kann. Diese Farbkanäle werden also in der Druckform bei deren Bebilderung mit erzeugt, vorzugsweise mit graviert. Dabei reicht gegebenenfalls ein jeweiliger Farbkanal 8 zur Verbindung eines Teilnäpfchens 2b mit einem zentralen Näpfchen 1 aus.According to the invention, therefore, image data are checked to see which image tiles are image edge tiles 3 and thus have edge cups 2b. Such Randnäpfchen 2b are then connected color-conductive by additional color channels 8 and Näpfchendurchstiche with the respective central cup of the picture edge tile so as to produce a Gesamtnäpfchen that can deliver the color of the Randnäpfchen properly. These color channels are thus generated in the printing form in the imaging with, preferably engraved with. If appropriate, a respective color channel 8 for the connection of a Teilnäpfchens 2b with a central cup 1 is sufficient.

Claims (12)

  1. Method of imaging a gravure printing forme in which in order to obtain variations in tonal value or print density cells of different size are engraved in the forme, wherein image data provided for the imaging of the forme are assembled parquet-fashion in an uninterrupted pattern of image-tiles (3, 4) comprising "border" tiles (3) adjacent to an image-border (6, 7) and "inner" tiles (4), the border tiles (3) being different from the inner tiles (4) and containing at least one cell (2b) that is only partially formed and is connected for ink-conducting purposes to at least one adjacent cell (1) of the border tiles (3), characterized in that ink-conducting connections (8) leading in different directions are provided between adjacent cells (1, 2b).
  2. Method according to Claim 1, characterized in that the at least one cell of the border tiles (3) that is only partially formed is a border cell (2b) that is cut off by the image-border (6, 7) and has an ink-conducting connection to an adjacent central cell (1) of the border tiles (3).
  3. Method according to Claim 2, characterized in that the adjacent cells (1, 2b) are connected for ink-conducting purposes by ink channels or through-cuts (8) between cells.
  4. Method according to any one of the preceding claims, characterized in that the inner tiles (4) contain cells (1, 2a) that have no ink-conducting connections to each other.
  5. Method according to Claim 1, characterized in that the inner tiles (4) contain one central cell (1) and inner part-cells (2a) that belong to a plurality of tiles (3, 4) and have no ink-conducting connections to the central cell (1).
  6. Method according to any one of the preceding claims, characterized in that the image data are assembled from polygonal image-tiles (3, 4).
  7. Method according to Claim 6, characterized in that the image data are assembled from rectangular image-tiles (3, 4).
  8. Method according to any one of the preceding claims, characterized in that each image-tile (3, 4) essentially comprises the area of one raster element of a cell image raster.
  9. Method according to Claims 7 and 8, characterized in that each image-tile (3, 4) contains one central cell (1) and, depending on the raster angle, parts of adjacent cells (2a, 2b) essentially located in approximately diagonal directions of the image-tile (3, 4).
  10. Method according to any one of the preceding claims, characterized in that the image data provided for the imaging of the gravure printing forme are scanned by environmental comparison of cells and/or pixels for cells adjacent to an image-border (6, 7) and/or for border tiles (3), and the latter are thereby identified.
  11. Method according to any one of the preceding claims, characterized in that the image-tiles (3, 4) have common boundaries (5) with adjacent image-tiles (3, 4).
  12. Device for imaging a gravure printing forme that engraves cells into a gravure printing forme,
    characterized in that
    it has a control, preferably programming or programmability, operable by the method according to one or more of Claims 1 to 11 and/or set up for such a method.
EP08010659A 2007-06-20 2008-06-12 Method and device for imaging a gravure printing form Active EP2006090B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007028838 2007-06-20
DE200710029099 DE102007029099A1 (en) 2007-06-21 2007-06-21 Rotogravure form imaging method for publication printing, involves providing cups of different dimensions to image rotogravure form, and assembling image data provided for imaging of form from image tiles

Publications (3)

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EP2006090A2 EP2006090A2 (en) 2008-12-24
EP2006090A3 EP2006090A3 (en) 2009-10-21
EP2006090B1 true EP2006090B1 (en) 2012-05-02

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US (1) US20080316540A1 (en)
EP (1) EP2006090B1 (en)
JP (1) JP2009001016A (en)
AT (1) ATE555902T1 (en)

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Publication number Priority date Publication date Assignee Title
JP6028688B2 (en) * 2013-07-29 2016-11-16 Ｊｆｅスチール株式会社 Printing apparatus and printing method

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0795194B2 (en) * 1989-05-19 1995-10-11 大日本スクリーン製造株式会社 Gravure printing plate
DE4338337C1 (en) * 1993-11-10 1995-05-24 Bernd Dr Bolzmann Engraving system for intaglio printing cylinder
US20040130753A1 (en) * 2003-01-06 2004-07-08 Crounse Kenneth R. Halftone method and system using hybrid AM/FM screening for highlight/shadow tonal regions
US7069851B2 (en) * 2004-01-20 2006-07-04 Think Laboratory Co., Ltd. Gravure printing method and gravure printed item
ES2293109T3 (en) * 2004-02-27 2008-03-16 HELL GRAVURE SYSTEMS GMBH & CO. KG PROCEDURE FOR THE ENGRAVING OF ALVEOLS FOR THE RECEPTION OF PRINT INKS FOR PRINTING OF HUECOGRABADO.
DE202006019713U1 (en) * 2006-12-28 2007-03-15 Wetzel Gmbh Rotogravure form for receiving printing ink comprises first cups and second cups having the same opening cross-section with the second cups being laterally connected by a through-cut

Also Published As

Publication number Publication date
EP2006090A3 (en) 2009-10-21
JP2009001016A (en) 2009-01-08
EP2006090A2 (en) 2008-12-24
US20080316540A1 (en) 2008-12-25
ATE555902T1 (en) 2012-05-15

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