EP1184176A2 - Method for correcting locally machine-produced colouring errors in rotary printing machines - Google Patents
Method for correcting locally machine-produced colouring errors in rotary printing machines Download PDFInfo
- Publication number
- EP1184176A2 EP1184176A2 EP01117735A EP01117735A EP1184176A2 EP 1184176 A2 EP1184176 A2 EP 1184176A2 EP 01117735 A EP01117735 A EP 01117735A EP 01117735 A EP01117735 A EP 01117735A EP 1184176 A2 EP1184176 A2 EP 1184176A2
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- European Patent Office
- Prior art keywords
- printing
- color
- coloring
- irregularities
- machine
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 238000007639 printing Methods 0.000 title claims abstract description 98
- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000004040 coloring Methods 0.000 title claims description 29
- 238000012360 testing method Methods 0.000 claims abstract description 11
- 230000001419 dependent effect Effects 0.000 claims abstract description 5
- 238000004519 manufacturing process Methods 0.000 claims description 12
- 238000000926 separation method Methods 0.000 claims description 9
- 238000003384 imaging method Methods 0.000 claims description 8
- 238000012986 modification Methods 0.000 claims description 6
- 230000004048 modification Effects 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 claims description 3
- 238000010186 staining Methods 0.000 claims description 2
- 238000012937 correction Methods 0.000 abstract description 9
- 230000000694 effects Effects 0.000 description 15
- 238000012546 transfer Methods 0.000 description 11
- 238000012545 processing Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 238000007645 offset printing Methods 0.000 description 3
- 238000012512 characterization method Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000001151 other effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000007650 screen-printing Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F33/00—Indicating, counting, warning, control or safety devices
- B41F33/0036—Devices for scanning or checking the printed matter for quality control
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
- B41P2233/00—Arrangements for the operation of printing presses
- B41P2233/10—Starting-up the machine
Definitions
- the invention relates to a method for correcting local, machine-related Coloring errors on rotary printing presses, which as banding, ink drop or as Stenciling in the finished printed product, the quality of which can decrease.
- the offset printing process due to the design of the offset printing units, it is not possible to color a printed sheet completely uniformly or, for a given subject, the halftone dots with a constant layer thickness.
- the inking of the printing form spanned on the circumference of a plate cylinder takes place continuously with an ink film using an offset printing unit, which is previously reduced to a specific ink film thickness by a plurality of friction or bridge rollers.
- the ink removal takes place discontinuously, however, because on the one hand the ink removal depends on the subject and on the other hand the peripheral surfaces of the plate cylinder receiving the printing form are discontinuous through the clamping channels.
- Interferences in the ink transfer for example at the interface from the inking unit to the surface of the plate cylinder delivering the ink to the transfer cylinder, at the interface between the printing form cylinder and transfer cylinder surfaces and at the interface between the surface of the transfer cylinder, which is usually given by a rubber-like elevator, with the Printing substrate leads to non-uniformities, which can affect the transferred ink layer thicknesses as well as the dot size generated in relation to the screen areas.
- the resulting effects are streaking, ink drop in the printing direction and stenciling effects.
- the relationships between these phenomena in the inking system are quite complex and cannot be viewed in isolation from one another.
- the invention has for its object machine-related Correct staining errors locally.
- the inking behavior of the printing form is machine-specific already in the prepress stage possible, so that the non-uniformity effects appearing later in the Coloring of the surface of the printing form is maintained during printing form production and can even out when printing later.
- proposed processes can not only be machine-specific properties global form but locally depending on the location of their occurrence as a function of Maintain halftone values and thus the quality of the print product to be produced significantly increase.
- the Coloring behavior of the printing units determined using test forms for the maximum format.
- the determination for the maximum format offers the advantage of using this as a reference value or Reference print product to go out and from this the determined To be able to convert coloring irregularities to smaller formats.
- the method can be used Coloring non-uniformity of the rotary printing press on only one printing unit can be determined as representative. This offers the advantage that only one of several Printing units must be selected so that the calibration within the Prepress a time advantage by only evaluating a printing unit leaves. In the case of a multicolor printing machine which, for example, has 4, 6 or 8 printing units Including series connected in series, this represents a significant time advantage.
- subject-dependent coloring irregularities the modification of the color separations of a Printing form, be it in plate form or as a printing sleeve or a film based on the data of the raster image processor depending on the subject.
- Cosmetic irregularities occur especially when areas with high Screen tones and areas with extremely low screen tones in print are narrow lie together.
- the method proposed according to the invention cannot only the behavior of the generation of Coloring irregularities but also that caused by the subject to be printed Coloring irregularities occurring due to extremely different Screen tone values are taken into account.
- the determined Coloring characteristics of the printing units or the individual printing units of one Transfer multicolour rotary press in the form of a profile to prepress become.
- the profiles can be transferred in tabular form, what their Further processing in the increasingly digital prepress is easier designed.
- the solution proposed according to the invention can be used to modify the halftone values when specifying the Screen tone fluctuations within the prepress stage during printing form production hold. This means that a printing form to be used later in the corresponding printing unit is be it in plate or sleeve form, prepared so that the resulting Coloring irregularities are maintained.
- digital Equipment of the corresponding prepress within the prepress Modification of the halftone tone values during the imaging process in digital Printing form imaging process e.g. in computer-to-press (direct imaging) Use imaging in the printing press as well as in the digital one Exposure of films or printing plates.
- the inking behavior of a multi-color rotary printing machine is after evaluation of Test printing based on previous print jobs known with sufficient accuracy. From Test printing or data already available from the previous print jobs Coloring non-uniformities with regard to color drop in the printing direction, which is more evident Stencil effects depending on the color assignment and the banding coupled by means of the method proposed according to the invention with the data which are at the printing form production of the respective print job to be carried out.
- the color nonuniformities occur depending on the subject, like this especially if the stencil effect is the case, the die Corrections relating to coloring nonuniformities are made depending on the subject.
- the subject creation data i.e. the Illustrations of the printing form in the prepress stage are known from this the color nonuniformity of the printing units Multicolor rotary press the corresponding corrections of the Coloring non-uniformities are determined and in the production of the corresponding Printing form per printing unit are taken into account.
- other effects such as the color drop of the printed product to be produced Be independent of the subject.
- the transfer of the coloring characteristics of the individual printing units Multi-color rotary printing press, or the necessary corrections can be in the form a profile, for example a multidimensional look-up table Prepress to be transferred. It is conceivable to couple the profile to the one Coloring behavior describing ICC profile of the printing press, to which the have the prepress data to be transferred attached in the form of an attachment. Can a transmission of the correction data to compensate for the resulting Coloring non-uniformities take place standardized per printing unit, is one Further processing of this data within prepress at Printing form production also to be carried out as standard and produces essential there less effort.
- the resolution of the data to be transferred in table form Coloring irregularities can be adapted to the error gradients that occur his.
- the color drop, stenciling, streak effects can also be caused by occurring amplitude, gradient, and the location of their occurrence characterized in more detail become.
- the correction of the screen tone values in screen printing processes can be done at the prepress stage two places of printing plate production are carried out.
- raster image processor processing the image data or during the imaging process in a digital Plate or film imagesetters or the computer-to-press process can both flat printing forms and sleeve-shaped printing forms are exposed.
- Methods proposed according to the invention can ensure that the location of the Correction on the surface of the images to be imaged or exposed Printing form matches the location of the occurrence of the error in the print. Only like that occurring color non-uniformities can be compensated locally, or at Keep the production of the appropriate color separation of a printing form, so that the effects of color drop or stencil effects Compensate for stenciling tendencies.
- the machine states i.e. Printing unit states when recording the fault pattern and are largely identical when printed later, if they influence the location of the error to have. If there is no influence on the location of the error that occurs, the Taking into account the prevailing machine conditions when recording the Error picture and irrelevant when printing later.
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- Engineering & Computer Science (AREA)
- Quality & Reliability (AREA)
- Printing Methods (AREA)
- Inking, Control Or Cleaning Of Printing Machines (AREA)
- Manufacture Or Reproduction Of Printing Formes (AREA)
- Facsimile Image Signal Circuits (AREA)
- Accessory Devices And Overall Control Thereof (AREA)
Abstract
Description
Die Erfindung bezieht sich auf ein Verfahren zur Korrektur lokaler, maschinenbedingter Färbungsfehler an Rotationsdruckmaschinen, die als Streifenbildung, Farbabfall oder als Schablonieren im fertigen Druckprodukt dessen Qualität mindernd auftreten können.The invention relates to a method for correcting local, machine-related Coloring errors on rotary printing presses, which as banding, ink drop or as Stenciling in the finished printed product, the quality of which can decrease.
Beim Offsetdruckverfahren besteht aufgrund der Konstruktion der Offsetdruckwerke nicht
die Möglichkeit, einen Druckbogen völlig gleichförmig bzw. bei vorgegebenem Sujet die
Rasterpunkte mit konstanter Schichtdicke einzufärben. Über ein Offsetdruckwerk erfolgt
die Einfärbung der auf dem Umfang eines Plattenzylinders aufgespannten Druckform zwar
kontinuierlich mit einem Farbfilm, der zuvor durch eine Vielzahl von Reib- bzw.
Brückenwalzen auf eine bestimmte Farbfilmdicke reduziert ist. Die Farbabnahme erfolgt
jedoch diskontinuierlich, weil einerseits die Farbabnahme sujetabhängig ist und
andererseits die Umfangsflächen des die Druckform aufnehmenden Plattenzylinders durch
die Spannkanäle diskontinuierlich ist.
Störungen in der Farbübertragung beispielsweise an der Schnittstelle vom Farbwerk zur
Oberfläche der die Farbe an den Übertragungszylinder abgebenden Plattenzylinder, an der
Schnittstelle zwischen Druckformzylinder und Übertragungszylinderoberflächen sowie an
der Schnittstelle zwischen der Oberfläche des Übertragungszylinders, die meistens durch
einen gummituchartigen Aufzug gegeben ist, mit dem zu bedruckenden Bedruckstoff
führen zu Ungleichförmigkeiten, die sich sowohl auf die übertragenen Farbschichtdicken
als auch in Bezug auf die Rasterflächen auf die erzeugte Punktgröße auswirken können.
Die sich daraus ergebenden Auswirkungen sind Streifenbildung, Farbabfall in
Druckrichtung sowie Schabloniereffekte. Die Zusammenhänge dieser auftretenden
Phänomene im Farbwerk sind recht komplex und lassen sich nicht isoliert voneinander
betrachten. With the offset printing process, due to the design of the offset printing units, it is not possible to color a printed sheet completely uniformly or, for a given subject, the halftone dots with a constant layer thickness. The inking of the printing form spanned on the circumference of a plate cylinder takes place continuously with an ink film using an offset printing unit, which is previously reduced to a specific ink film thickness by a plurality of friction or bridge rollers. The ink removal takes place discontinuously, however, because on the one hand the ink removal depends on the subject and on the other hand the peripheral surfaces of the plate cylinder receiving the printing form are discontinuous through the clamping channels.
Interferences in the ink transfer, for example at the interface from the inking unit to the surface of the plate cylinder delivering the ink to the transfer cylinder, at the interface between the printing form cylinder and transfer cylinder surfaces and at the interface between the surface of the transfer cylinder, which is usually given by a rubber-like elevator, with the Printing substrate leads to non-uniformities, which can affect the transferred ink layer thicknesses as well as the dot size generated in relation to the screen areas. The resulting effects are streaking, ink drop in the printing direction and stenciling effects. The relationships between these phenomena in the inking system are quite complex and cannot be viewed in isolation from one another.
Um eine hohe Gleichförmigkeit in dem Verlauf der Farbdichte bzw. der Farbschichtdicke im Druck zu erzielen, werden bei der Auslegung von Farbwerken an Rotationsdruckmaschinen diese Effekte im Rahmen von Simulationsprogrammen und Konstruktionsprinzipien weitestgehend berücksichtigt, das Farbwerk wird in Bezug auf die angesprochenen Effekte optimiert. Darüber hinaus besteht die Möglichkeit, zum Beispiel durch im Farbwerk eingesetzte Reibwalzen und deren Einsatzzeitpunkt diese Fehler zu beeinflussen. Ferner gestattet die Auswahl geeigneter als Übertragungszylinderaufzüge fungierender Übertragungsaufzugsflächen wie Gummitücher, das Auftreten dynamisch verursachter Streifen zu reduzieren. Eine gezielte lokale Korrektur von Färbungsungleichmäßigkeiten im Druck ist jedoch mit diesen Maßnahmen nicht erzielbar.To ensure a high degree of uniformity in the course of the color density or the color layer thickness To achieve in print, are in the design of inking units Rotary printing presses these effects in the context of simulation programs and Construction principles largely taken into account, the inking unit is in relation to the optimized effects. There is also the possibility, for example due to the friction rollers used in the inking unit and their time of use, these errors influence. Furthermore, the selection allows more suitable than transfer cylinder lifts acting transfer elevator areas such as rubber blankets, the appearance dynamic reduce streaks caused. A targeted local correction by Coloring irregularities in the print, however, cannot be achieved with these measures.
Angesichts der aus dem Stand der Technik bekannten Lösungen sowie des aufgezeigten technischen Problems liegt der Erfindung die Aufgabe zugrunde, maschinenbedingte Färbungsfehler lokal zu korrigieren.In view of the solutions known from the prior art as well as that shown Technical problem, the invention has for its object machine-related Correct staining errors locally.
Erfindungsgemäß wird die Aufgabe durch ein Verfahren zur Korrektur lokaler, maschinenbedingter Färbungsfehler an Rotationsdruckmaschinen gelöst, bei dem die nachfolgenden Verfahrensschritte durchlaufen werden:
- die Ermittlung des Einfärbeverhaltens der Druckwerke mittels Testformen,
- die Erfassung der Färbungsungleichförmigkeiten an den Testformen und die Übermittlung der Daten zur Färbungsungleichförmigkeit an die Druckvorstufe sowie
- die Modifikation der Rastertonwerte der Farbauszüge einer Druckform derart, daß die Färbungsungleichförmigkeiten lokal abhängig vom Ort ihres Auftretens im Druck auf den Druckformen bzw. -filmen vorgehalten werden.
- the determination of the inking behavior of the printing units using test forms,
- the recording of the color nonuniformity on the test forms and the transmission of the data on the color nonuniformity to the prepress as well as
- the modification of the halftone values of the color separations of a printing form in such a way that the color nonuniformities are kept locally dependent on the location of their occurrence in the print on the printing forms or films.
Die sich aus der erfindungsgemäß vorgeschlagenen Lösung ergebenden Vorteile sind vor allem darin zu erblicken, daß im fertiggestellten Druckprodukt störende Streifen, der Farbabfall in Druckrichtung sowie Schabloniereffekte nicht mehr oder nur noch im geringen Maße visuell sichtbar sind. Es ist eine Berücksichtigung des Druck- bzw. The advantages resulting from the solution proposed according to the invention are present to see everything in the fact that in the finished printed product disruptive strips, the Color drop in the printing direction and stencil effects no longer or only in the small dimensions are visually visible. The pressure or
Einfärbeverhaltens der Druckform maschinenspezifisch bereits in der Druckvorstufe möglich, so daß die sich später einstellenden Ungleichförmigkeitseffekte bei der Farbgebung der Oberfläche der Druckform bei der Druckformherstellung vorgehalten werden können und sich beim späteren Druck ausgleichen. Durch das erfindungsgemäß vorgeschlagene Verfahren lassen sich maschinenspezifische Eigenschaften nicht nur in globaler Form sondern lokal abhängig vom Ort ihres Auftretens als Funktion der Rastertonwerte vorhalten und somit die Güte des zu erzeugenden Druckproduktes signifikant erhöhen.The inking behavior of the printing form is machine-specific already in the prepress stage possible, so that the non-uniformity effects appearing later in the Coloring of the surface of the printing form is maintained during printing form production and can even out when printing later. By the invention proposed processes can not only be machine-specific properties global form but locally depending on the location of their occurrence as a function of Maintain halftone values and thus the quality of the print product to be produced significantly increase.
In vorteilhafter Weiterbildung des erfindungsgemäß vorgeschlagenen Verfahrens wird das Einfärbeverhalten der Druckwerke mittels Testformen für das maximale Format ermittelt. Die Ermittlung für das Maximalformat bietet den Vorteil, von diesem als Bezugswert bzw. Bezugs-Druckprodukt auszugehen und von diesem aus die ermittelten Einfärbeungleichförmigkeiten auf kleinere Formate umrechnen zu können.In an advantageous development of the method proposed according to the invention, the Coloring behavior of the printing units determined using test forms for the maximum format. The determination for the maximum format offers the advantage of using this as a reference value or Reference print product to go out and from this the determined To be able to convert coloring irregularities to smaller formats.
Gemäß einer vorteilhaften Weiterbildung des erfindungsgemäß vorgeschlagenen Verfahrens kann bei druckwerksunabhängig ermittelten Färbungsungleichförmigkeiten die Färbungsungleichförmigkeit der Rotationsdruckmaschine an lediglich einem Druckwerk stellvertretend ermittelt werden. Dies bietet den Vorteil, daß lediglich eines von mehreren Druckwerken ausgewählt werden muß, so daß sich bei der Kalibrierung der innerhalb der Druckvorstufe ein Zeitvorteil durch lediglich die Auswertung eines Druckwerkes erzielen läßt. Bei einer Mehrfarbendruckmaschine, die beispielsweise 4, 6 oder 8 Druckwerke in Reihe hintereinander geschaltet umfaßt, stellt dies einen signifikanten Zeitvorteil dar.According to an advantageous development of the proposed according to the invention In the case of coloring nonuniformities determined independently of the printing unit, the method can be used Coloring non-uniformity of the rotary printing press on only one printing unit can be determined as representative. This offers the advantage that only one of several Printing units must be selected so that the calibration within the Prepress a time advantage by only evaluating a printing unit leaves. In the case of a multicolor printing machine which, for example, has 4, 6 or 8 printing units Including series connected in series, this represents a significant time advantage.
In vorteilhafter Weiterbildung des erfindungsgemäß vorgeschlagenen Verfahrens kann bei sujetabhängigen Färbungsungleichförmigkeiten die Modifikation der Farbauszüge einer Druckform, sei es in Plattenform oder als Druckhülse oder eines Filmes anhand der Daten des Raster-Image-Prozessors sujetabhängig erfolgen. Sujetabhängige Färbungsungleichförmigkeiten treten vor allem dann auf, wenn Bereiche mit hohen Rastertonwerten und Bereiche mit extrem niedrigem Rastertonwerten im Druck eng beieinander liegen. Mittels des erfindungsgemäß vorgeschlagenen Verfahrens kann nicht nur das druckmaschinen- bzw. druckwerkabhängige Verhalten der Erzeugung von Färbungsungleichförmigkeiten sondern auch den durch das zu druckende Sujet auftretenden Färbungsungleichförmigkeiten durch extrem unterschiedliche Rastertonwerten Rechnung getragen werden.In an advantageous development of the method proposed according to the invention, subject-dependent coloring irregularities the modification of the color separations of a Printing form, be it in plate form or as a printing sleeve or a film based on the data of the raster image processor depending on the subject. sujet addicts Coloring irregularities occur especially when areas with high Screen tones and areas with extremely low screen tones in print are narrow lie together. The method proposed according to the invention cannot only the behavior of the generation of Coloring irregularities but also that caused by the subject to be printed Coloring irregularities occurring due to extremely different Screen tone values are taken into account.
Mit dem erfindungsgemäß vorgeschlagenen Verfahren können die ermittelten Färbungscharakteristika der Druckwerke bzw. der einzelnen Druckwerke einer Mehrfarbenrotationsdruckmaschine in Form eines Profiles an die Druckvorstufe übertragen werden.With the method proposed according to the invention, the determined Coloring characteristics of the printing units or the individual printing units of one Transfer multicolour rotary press in the form of a profile to prepress become.
Die Profile können insbesondere in Tabellenform übertragen werden, was deren Weiterverarbeitung in der zunehmend in digitaler Form arbeitenden Druckvorstufe leichter gestaltet.The profiles can be transferred in tabular form, what their Further processing in the increasingly digital prepress is easier designed.
Denkbar ist auch eine Übertragung der Färbungscharakteristika in Form von Amplitude, Gradient, Position im Bild etc..It is also conceivable to transfer the coloring characteristics in the form of amplitude, Gradient, position in the image etc.
Innerhalb der übertragenen Profile ist deren Auflösung an den Fehlergradienten der Färbungsungleichförmigkeiten angepaßt. Die erfindungsgemäß vorgeschlagene Lösung läßt sich zur Modifikation der Rastertonwerte bei der Vorgabe der Rastertonwertschwankungen innerhalb der Druckvorstufe bei der Druckformherstellung vorhalten. Damit ist eine später im entsprechenden Druckwerk einzusetzende Druckform, sei es in Platten- oder in Hülsenform, so präpariert, daß die sich einstellenden Färbungsungleichförmigkeiten vorgehalten sind. Daneben läßt sich bei digitaler Ausstattung der entsprechenden Druckvorstufe innerhalb der Druckvorstufe die Modifikation der Rastertonwerte beim Bebilderungsvorgang im digitalen Druckformbebilderungsverfahren z.B. bei Computer-to-Press (Direct-Imaging) Bebilderung in der Druckmaschine einsetzen sowie auch bei der digital erfolgenden Belichtung von Filmen oder Druckplatten. Within the transferred profiles, their resolution is based on the error gradients Coloring irregularities adjusted. The solution proposed according to the invention can be used to modify the halftone values when specifying the Screen tone fluctuations within the prepress stage during printing form production hold. This means that a printing form to be used later in the corresponding printing unit is be it in plate or sleeve form, prepared so that the resulting Coloring irregularities are maintained. In addition, with digital Equipment of the corresponding prepress within the prepress Modification of the halftone tone values during the imaging process in digital Printing form imaging process e.g. in computer-to-press (direct imaging) Use imaging in the printing press as well as in the digital one Exposure of films or printing plates.
Das Einfärbeverhalten einer Mehrfarbenrotationsdruckmaschine, deren einzelne Druck-bzw. Veredelungswerke hintereinander geschaltet sind, ist nach Auswertung von Testdrucken anhand vorausgegangener Druckaufträge hinreichend genau bekannt. Die aus Testdrucken oder bereits aus den vorhergehenden Druckaufträgen vorliegenden Daten zur Einfärbeungleichförmigkeiten hinsichtlich Farbabfall in Druckrichtung, sich einstellender Schabloniereffekte abhängig von der Farbbelegung sowie der Streifenbildung werden mittels des erfindungsgemäß vorgeschlagenen Verfahrens mit den Daten gekoppelt, die bei der Druckformherstellung des jeweils auszuführenden Druckauftrages anfallen.The inking behavior of a multi-color rotary printing machine, the individual printing or. Processing plants are connected in series, is after evaluation of Test printing based on previous print jobs known with sufficient accuracy. From Test printing or data already available from the previous print jobs Coloring non-uniformities with regard to color drop in the printing direction, which is more evident Stencil effects depending on the color assignment and the banding coupled by means of the method proposed according to the invention with the data which are at the printing form production of the respective print job to be carried out.
Die sich gemäß des Offsetverfahrens einstellenden Einfärbungsungleichförmigkeiten, haben ihre Ursache in dem allgemeinen Effekt, daß bei diesem Druckverfahren die Fabrzufuhr zwar kontinuierlich erfolgt, jedoch die Farbabnahme von den den Farbfilm führenden übertragenden Oberflächen innerhalb des Druckwerkes diskontinuierlich erfolgt. Mit dem erfindungsgemäß vorgeschlagenen Verfahren werden die maschinenbedingten Fehler bei der Herstellung der Druckform in Form lokaler Rastertonwertveränderungen vorgehalten, so daß sie im zu erzeugenden Druckbild, welches nach Durchlaufen des Bedruckstoffes durch eine Anzahl von hintereinander geschalteten Druckwerken im so erzeugten überlagerten Druckbild mehrerer Farbauszüge anschließend nicht mehr oder nur noch eingeschränkt sichtbar sind.The coloration non-uniformities that result from the offset process, have their cause in the general effect that with this printing process the Factory supply takes place continuously, but the ink is removed from the ink film leading transfer surfaces within the printing unit takes place discontinuously. With the method proposed according to the invention, the machine-related Error in the production of the printing form in the form of local halftone changes held so that they are in the print image to be generated, which after passing through the Printing material through a number of printing units connected in series in the sun subsequently no longer or only generated a superimposed print image of several color separations are still partially visible.
Treten die sich einstellenden Färbungsungleichförmigkeiten lediglich druckwerkspezifisch auf, müssen bei der Charakterisierung alle Druckwerke einer Mehrfarbenrotationsdruckmaschine hinsichtlich der Färbungsungleichförmigkeiten untersucht sowie die in den jeweiligen Druckwerken zu verwendenden Druckformen hinsichtlich der Färbungsungleichförmigkeiten unterschiedlich vorgehalten werden.If the resulting color irregularities occur only in the printing unit on, all printing units must be one in the characterization Multi-color rotary printing machine with regard to the color non-uniformity examined as well as the printing forms to be used in the respective printing units with regard to the color non-uniformities are kept different.
Sind die sich einstellenden Färbungsungleichförmigkeiten von Druckwerk zu Druckwerk identisch, so kann bei einer 2, 4, 6, 8 Druckwerke sowie eine oder mehrere Veredlungseinheiten enthaltenden Mehrfarbenrotationsdruckmaschine lediglich ein Druckwerk herausgegriffen werden und stellvertretend für die anderen Druckwerke hinsichtlich der Übertragung der Daten zur sich einstellenden Färbungsungleichförmigkeit an die Druckvorstufe übertragen werden. Dabei ist unerheblich, ob die Druckvorstufe in digitaler Form arbeitet oder ob in konventioneller Manier die einzelnen Druckformen bzw. die Farbauszüge pro Druckwerk mit Filmen belichtet bzw. erzeugt werden.Are the resulting color non-uniformities from printing unit to printing unit identical, so with a 2, 4, 6, 8 printing units as well as one or more Multi-color rotary printing press containing finishing units only one Printing unit can be picked out and representative of the other printing units with regard to the transfer of the data on the color nonuniformity which arises be transferred to prepress. It is irrelevant whether the prepress in works digitally or whether the individual printing forms or the color separations for each printing unit are exposed or produced with films.
Treten die Färbungsungleichförmigkeiten hingegen sujetabhängig auf, wie dies insbesondere beim Schabloniereffekt der Fall ist, müssen auch die die Färbungsungleichförmigkeiten betreffenden Korrekturen sujetabhängig erfolgen. Bei der Druckformherstellung in der Druckvorstufe ist bei dem Erzeugen der Farbauszüge das Sujet jedoch hinreichend genau bekannt. Da die Daten zur Sujetherstellung, d.h. der Bebilderung der Druckform in der Druckvorstufe bekannt sind, können daraus in Kenntnis der Färbungsungleichförmigkeiten der Druckwerke einer Mehrfarbenrotationsdruckmaschine die entsprechenden Korrekturen der Färbungsungleichförmigkeiten ermittelt und bei der Herstellung der entsprechenden Druckform pro Druckwerk berücksichtigt werden. Neben den Schabloniereffekten könnten andere Effekte, wie z.B. der Farbabfall des zu erzeugenden Druckproduktes sujetunabhängig sein. Bei dieser Art auftretender Färbungsungleichmäßigkeiten können die Korrekturen global durchgeführt werden, d.h. unabhängig vom Druckbild. Dies bedeutet, daß bei der entsprechenden Druckformherstellung die Rastertonwerterzeugung über die Drucklänge gesehen, den sich einstellenden Farbabfall bei sujetunabhängig über die Drucklänge kompensiert, d.h. vorhält.However, the color nonuniformities occur depending on the subject, like this especially if the stencil effect is the case, the die Corrections relating to coloring nonuniformities are made depending on the subject. In the Printing form production in the prepress is that when creating the color separations However, the subject is sufficiently well known. Since the subject creation data, i.e. the Illustrations of the printing form in the prepress stage are known from this the color nonuniformity of the printing units Multicolor rotary press the corresponding corrections of the Coloring non-uniformities are determined and in the production of the corresponding Printing form per printing unit are taken into account. In addition to the stencil effects other effects, such as the color drop of the printed product to be produced Be independent of the subject. With this type of coloring irregularities occurring Corrections are made globally, i.e. regardless of the printed image. This means, that in the corresponding printing form production, the halftone value generation via the Seen the print length, the color drop that occurs with the subject regardless of the Print length compensated, i.e. holds.
Die Übertragung der Färbungscharakteristika der einzelnen Druckwerke einer Mehrfarbenrotationsdruckmaschine, bzw. die erforderlichen Korrekturen, können in Form eines Profiles beispielsweise einer mehrdimensionalen Look-up-Tabelle an die Druckvorstufe übertragen werden. Vorstellbar ist die Kopplung des Profiles an ein das Färbungsverhalten beschreibendes ICC-Profil der Druckmaschine, an welches sich die an die Druckvorstufe zu übertragenden Daten auch in Form eines Anhangs anhängen lassen. Kann eine Übertragung der Korrekturdaten zur Kompensation der sich einstellenden Färbungsungleichförmigkeiten pro Druckwerk standardisiert erfolgen, so ist eine Weiterverarbeitung dieser Daten innerhalb der Druckvorstufe bei der Druckformherstellung ebenfalls standardmäßig durchzuführen und erzeugt dort wesentlich weniger Aufwand. Die Auflösung der in Tabellenform zu übertragenden Färbungsungleichförmigkeiten kann an den jeweils auftretenden Fehlergradienten angepaßt sein. Neben der Charakterisierung der Färbungsungleichförmigkeiten durch den Fehlergradienten, können die Farbabfall-, Schablonier-, Streifen-Effekte auch durch auftretende Amplitude, Gradienten, sowie den Ort ihres Auftretens näher charakterisiert werden. Je genauer und eindeutiger die auftretenden Färbungsungleichförmigkeiten der einzelnen Druckwerke einer Rotationsdruckmaschine bekannt sind, und je mehr Daten zum Auftreten, hinsichtlich des lokalen Auftretens der Fehler bekannt sind, desto genauer läßt sich bei der Druckformherstellung einer Kompensation dieser Effekte vorhalten, was bewirkt, daß die auftretenden Effekte pro Druckwerk später im Druck kaum mehr oder völlig unsichtbar sind.The transfer of the coloring characteristics of the individual printing units Multi-color rotary printing press, or the necessary corrections, can be in the form a profile, for example a multidimensional look-up table Prepress to be transferred. It is conceivable to couple the profile to the one Coloring behavior describing ICC profile of the printing press, to which the have the prepress data to be transferred attached in the form of an attachment. Can a transmission of the correction data to compensate for the resulting Coloring non-uniformities take place standardized per printing unit, is one Further processing of this data within prepress at Printing form production also to be carried out as standard and produces essential there less effort. The resolution of the data to be transferred in table form Coloring irregularities can be adapted to the error gradients that occur his. In addition to the characterization of the color irregularities by the Error gradients, the color drop, stenciling, streak effects can also be caused by occurring amplitude, gradient, and the location of their occurrence characterized in more detail become. The more precise and unambiguous the coloration non-uniformities that occur individual printing units of a rotary printing press are known, and the more data for Occurrence, with regard to the local occurrence of the errors are known, the more precisely lets to compensate for these effects in the production of printing plates, what causes the effects that occur per printing unit later in printing hardly or are completely invisible.
Die Korrektur der Rastertonwerte bei Rasterdruckverfahren kann an der Druckvorstufe an zwei Stellen der Druckformherstellung durchgeführt werden. Bei der Raster-Image-Prozesor-Bearbeitung der Bilddaten, oder beim Bebilderungsvorgang in einem digitalen Platten- oder auch Filmbelichter oder beim Computer-to-Press Verfahren können sowohl ebene Druckformen als auch hülsenförmige Druckformen belichtet werden. Mit dem erfindungsgemäß vorgeschlagenen Verfahren kann sichergestellt werden, daß der Ort der Korrektur auf der Oberfläche der jeweils zu bebildernden, bzw. zu belichtenden Druckformen mit dem Ort des Auftretens des Fehlers im Druck übereinstimmt. Nur so lassen sich auftretende Färbungsungleichförmigkeiten lokal kompensieren, bzw. bei der Herstellung des entsprechenden Farbauszuges einer Druckform vorhalten, so daß die sich einstellenden Effekte von Farbabfall bzw. sich einstellende Schabloniereffekte bei zu Schablonieren neigenden Sujets kompensieren. In vorteilhafter Weise ist sichergestellt, daß die Maschinenzustände, d.h. Druckwerkzustände bei der Aufnahme des Fehlerbildes und beim späteren Druck weitestgehend identisch sind, falls sie Einfluß auf den Fehlerort haben. Falls kein Einfluß auf den Ort des auftretenden Fehlers besteht, ist die Berücksichtigung der jeweils herrschenden Maschinenzustände bei der Aufnahme des Fehlerbildes sowie beim späteren Druck unerheblich.The correction of the screen tone values in screen printing processes can be done at the prepress stage two places of printing plate production are carried out. In raster image processor processing the image data, or during the imaging process in a digital Plate or film imagesetters or the computer-to-press process can both flat printing forms and sleeve-shaped printing forms are exposed. With the Methods proposed according to the invention can ensure that the location of the Correction on the surface of the images to be imaged or exposed Printing form matches the location of the occurrence of the error in the print. Only like that occurring color non-uniformities can be compensated locally, or at Keep the production of the appropriate color separation of a printing form, so that the effects of color drop or stencil effects Compensate for stenciling tendencies. It is advantageously ensured that the machine states, i.e. Printing unit states when recording the fault pattern and are largely identical when printed later, if they influence the location of the error to have. If there is no influence on the location of the error that occurs, the Taking into account the prevailing machine conditions when recording the Error picture and irrelevant when printing later.
Claims (10)
dadurch gekennzeichnet, daß das Einfärbeverhalten der Druckwerke mittels Testformen für das maximale Format ermittelt wird.Method according to claim 1,
characterized in that the inking behavior of the printing units is determined using test forms for the maximum format.
dadurch gekennzeichnet, daß bei druckwerksunabhängig auftretenden Färbungsungleichförmigkeiten diese an einem Druckwerk stellvertretend ermittelt werden.Method according to claim 1,
characterized in that in the event of printing irregularities occurring independently of the printing unit, these are determined as representative on a printing unit.
dadurch gekennzeichnet, daß bei sujetabhängigen Färbungsungleichförmigkeiten die Modifikation der Farbauszüge einer Druckform oder eines Films anhand der Daten, Bild- bzw. Farbauszugdaten sujetabhängig erfolgen. Method according to claim 1,
characterized in that the color separations of a printing form or a film are carried out on the basis of the data, image or color separation data depending on the subject in the case of subject-dependent coloring irregularities.
dadurch gekennzeichnet, daß die ermittelten Färbungscharakteristika der Druckmaschine in Form eines Profiles oder eines anderen Färbungsstandards an die Druckvorstufe übertragen werden.Method according to claim 1,
characterized in that the determined coloring characteristics of the printing press are transferred to the prepress in the form of a profile or another coloring standard.
dadurch gekennzeichnet, daß das Profil in Tabellenform übertragen wird.Method according to claim 5,
characterized in that the profile is transferred in tabular form.
dadurch gekennzeichnet, daß die Auflösung des Profiles an den Fehlergradienten der Färbungsungleichförmigkeiten angepaßt ist.Method according to claim 5,
characterized in that the resolution of the profile is adapted to the error gradient of the coloring non-uniformities.
dadurch gekennzeichnet, daß die Modifikation der Rastertonwerte bei der Vorgabe der Rastertonwerte bei der Druckformherstellung vorgehalten wird.Method according to claim 1,
characterized in that the modification of the halftone values is provided when the halftone values are specified in the production of the printing form.
dadurch gekennzeichnet, daß die Modfikation der Rastertonwerte beim Bebilderungsvorgang im digitalen Druckform-/ bzw. filmbelichter oder bei DI (Direct-Imaging) Bebilderung in der Maschine direkt erfolgt.Method according to claim 1,
characterized in that the modification of the halftone tone values takes place directly during the imaging process in the digital printing plate or film exposure or with DI (direct imaging) imaging in the machine.
dadurch gekennzeichnet, daß anstelle von Testformen geeignete Druckaufträge für die Ermittlung der Färbungsungleichmäßigkeiten eingesetzt werden.Method according to claim 1,
characterized in that, instead of test forms, suitable print jobs are used to determine the color irregularities.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10042680 | 2000-08-31 | ||
| DE10042680A DE10042680A1 (en) | 2000-08-31 | 2000-08-31 | Process for correcting local, machine-related staining errors on rotary printing presses |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP1184176A2 true EP1184176A2 (en) | 2002-03-06 |
| EP1184176A3 EP1184176A3 (en) | 2004-01-21 |
| EP1184176B1 EP1184176B1 (en) | 2008-03-05 |
Family
ID=7654357
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP01117735A Expired - Lifetime EP1184176B1 (en) | 2000-08-31 | 2001-07-30 | Method for correcting locally machine-produced colouring errors in rotary printing machines |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US6694883B2 (en) |
| EP (1) | EP1184176B1 (en) |
| JP (1) | JP5280598B2 (en) |
| AT (1) | ATE388018T1 (en) |
| CA (1) | CA2353289C (en) |
| DE (2) | DE10042680A1 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005029209A1 (en) * | 2003-08-19 | 2005-03-31 | Medigraph Gmbh | Control method for production processes with color-relevant products and printing outcome control method |
| EP1759845A2 (en) * | 2005-08-31 | 2007-03-07 | MAN Roland Druckmaschinen AG | Control process for printing methods |
| WO2007147405A2 (en) * | 2006-06-23 | 2007-12-27 | Dieter Kirchner | Test form for determining the state and the setting of the dampening unit system of an offset printing press, and method for setting |
| EP1916100A1 (en) | 2006-10-26 | 2008-04-30 | Heidelberger Druckmaschinen Aktiengesellschaft | Printing plate generation for anilox printing presses |
| WO2011057725A1 (en) * | 2009-11-10 | 2011-05-19 | Manroland Ag | Method for controlling a printing process |
| US8159719B2 (en) | 2007-07-10 | 2012-04-17 | Heidelberger Druckmaschinen Ag | Method for correcting the gray balance of a printing process |
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| DE10213708A1 (en) * | 2002-03-27 | 2003-10-23 | Roland Man Druckmasch | Print forme production method, especially for a rotary lithographic offset printer, whereby corrections for print cylinder deformation are applied by determination of correction values from differences in transfer curves |
| US7032508B2 (en) * | 2003-03-21 | 2006-04-25 | Quad/Tech, Inc. | Printing press |
| US7586656B2 (en) * | 2006-06-06 | 2009-09-08 | E. I. Du Pont De Nemours And Company | Process for producing optimised printing forms |
| DE102006050552A1 (en) * | 2006-10-26 | 2008-04-30 | Man Roland Druckmaschinen Ag | Method for compensation of local, coloring error caused by machine in rotary printing press, particularly sheet-fed offset printing machine, involves arranging printing blocks on plate or form cylinders |
| DE102008031995B4 (en) * | 2007-07-26 | 2021-04-01 | Heidelberger Druckmaschinen Ag | Automatic correction of image defects using new printing plates |
| DE102008007326A1 (en) * | 2008-02-02 | 2009-08-06 | Manroland Ag | Method for printing print substrate, involves generating print job dependent raster data in raster image processor on basis of print job dependent image data of pre-press, where computerized stimulation is carried out |
| JP5505636B2 (en) | 2010-06-18 | 2014-05-28 | コニカミノルタ株式会社 | Image processing device |
| DE102019200185A1 (en) | 2019-01-09 | 2020-07-09 | Heidelberger Druckmaschinen Ag | Color compensation in offset printing |
| JP7410193B2 (en) | 2022-01-13 | 2024-01-09 | 大陽日酸株式会社 | Rotating spindle and rotating machinery |
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- 2001-07-30 EP EP01117735A patent/EP1184176B1/en not_active Expired - Lifetime
- 2001-07-30 AT AT01117735T patent/ATE388018T1/en not_active IP Right Cessation
- 2001-07-30 DE DE50113682T patent/DE50113682D1/en not_active Expired - Lifetime
- 2001-08-24 JP JP2001254154A patent/JP5280598B2/en not_active Expired - Fee Related
- 2001-08-31 US US09/944,578 patent/US6694883B2/en not_active Expired - Fee Related
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| DE3925533A1 (en) * | 1989-08-02 | 1991-02-07 | Krause Biagosch Gmbh | Producing printing matrix with corrected raster dot sizes - correcting separate partial surfaces w.r.t. standard dependent on their tone value |
| US5662044A (en) * | 1995-02-24 | 1997-09-02 | Heidelberger Druckmaschinen Ag | Offset printing method |
| EP0878303A2 (en) * | 1997-05-15 | 1998-11-18 | Presstek, Inc. | Distributed imaging and control architecture for digital printing presses and platesetters |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005029209A1 (en) * | 2003-08-19 | 2005-03-31 | Medigraph Gmbh | Control method for production processes with color-relevant products and printing outcome control method |
| EP1759845A2 (en) * | 2005-08-31 | 2007-03-07 | MAN Roland Druckmaschinen AG | Control process for printing methods |
| EP1759845A3 (en) * | 2005-08-31 | 2010-11-17 | manroland AG | Control process for printing methods |
| WO2007147405A2 (en) * | 2006-06-23 | 2007-12-27 | Dieter Kirchner | Test form for determining the state and the setting of the dampening unit system of an offset printing press, and method for setting |
| WO2007147405A3 (en) * | 2006-06-23 | 2008-04-03 | Dieter Kirchner | Test form for determining the state and the setting of the dampening unit system of an offset printing press, and method for setting |
| EP1916100A1 (en) | 2006-10-26 | 2008-04-30 | Heidelberger Druckmaschinen Aktiengesellschaft | Printing plate generation for anilox printing presses |
| US8358434B2 (en) | 2006-10-26 | 2013-01-22 | Heidelberger Druckmaschinen Ag | Method and system for producing printing forms for anilox printing presses |
| US8159719B2 (en) | 2007-07-10 | 2012-04-17 | Heidelberger Druckmaschinen Ag | Method for correcting the gray balance of a printing process |
| WO2011057725A1 (en) * | 2009-11-10 | 2011-05-19 | Manroland Ag | Method for controlling a printing process |
| US9774763B2 (en) | 2009-11-10 | 2017-09-26 | Manroland Web Systems Gmbh | Method for controlling a printing process |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1184176B1 (en) | 2008-03-05 |
| DE10042680A1 (en) | 2002-03-14 |
| JP2002113842A (en) | 2002-04-16 |
| DE50113682D1 (en) | 2008-04-17 |
| JP5280598B2 (en) | 2013-09-04 |
| US6694883B2 (en) | 2004-02-24 |
| CA2353289A1 (en) | 2002-02-28 |
| US20020043172A1 (en) | 2002-04-18 |
| ATE388018T1 (en) | 2008-03-15 |
| CA2353289C (en) | 2008-12-30 |
| EP1184176A3 (en) | 2004-01-21 |
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