EP1184176B1 - 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
- EP1184176B1 EP1184176B1 EP01117735A EP01117735A EP1184176B1 EP 1184176 B1 EP1184176 B1 EP 1184176B1 EP 01117735 A EP01117735 A EP 01117735A EP 01117735 A EP01117735 A EP 01117735A EP 1184176 B1 EP1184176 B1 EP 1184176B1
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- European Patent Office
- Prior art keywords
- printing
- inking
- uniformities
- machine
- tone values
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- 238000007639 printing Methods 0.000 title claims abstract description 106
- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000004040 coloring Methods 0.000 title description 10
- 238000012937 correction Methods 0.000 claims abstract description 13
- 238000012360 testing method Methods 0.000 claims abstract description 11
- 230000001419 dependent effect Effects 0.000 claims abstract description 7
- 238000004519 manufacturing process Methods 0.000 claims description 17
- 238000003384 imaging method Methods 0.000 claims description 8
- 238000000926 separation method Methods 0.000 claims description 8
- 238000012986 modification Methods 0.000 claims description 5
- 230000004048 modification Effects 0.000 claims description 5
- 230000000694 effects Effects 0.000 description 16
- 238000004043 dyeing Methods 0.000 description 13
- 230000008901 benefit Effects 0.000 description 12
- 238000012546 transfer Methods 0.000 description 11
- 238000011161 development Methods 0.000 description 3
- 238000007645 offset printing Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000010186 staining Methods 0.000 description 3
- 238000012512 characterization method Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000002955 isolation Methods 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
Classifications
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- 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 dyeing errors on rotary printing presses, which can occur as striping, color waste or as stenciling in the finished printed product whose quality.
- the offset printing process does not offer the possibility of uniformly coloring a printed sheet or coloring the screen dots with a constant layer thickness for a given subject.
- the inking of the printing form mounted on the circumference of a plate cylinder is effected continuously via an offset printing unit with a color film which has previously been reduced to a specific ink film thickness by a multiplicity of friction or bridge rollers.
- the color decrease takes place discontinuously, because on the one hand, the color decrease is dependent on the subject and on the other hand, the peripheral surfaces of the printing plate receiving plate cylinder is discontinuous by the clamping channels.
- Disturbances in the color transfer for example, at the interface of the inking unit to the surface of the color cylinder to the transfer cylinder plate cylinder, at the interface between the printing forme cylinder and transfer cylinder surfaces and at the interface between the surface of the transfer cylinder, which is usually given by a rubber blanket-like elevator, with the printing substrate lead to non-uniformities, which can affect both the transferred ink layer thicknesses as well as with respect to the grid areas on the generated dot size.
- the resulting effects are banding, ink drop in the printing direction and stenciling effects.
- the connections between these phenomena in the inking unit are quite complex and can not be viewed in isolation from each other.
- the inking unit is optimized in terms of the effects mentioned.
- the selection of suitable transfer elevator surfaces, such as blankets, acting as transfer cylinder elevators allows the occurrence of dynamically induced streaks to be reduced.
- a targeted local correction of inking color irregularities in the print is not achievable with these measures.
- a method for the production of printing forms which makes a correction of halftone dots in the exposure of a printing plate depending on Tonwertstörssenn.
- the method is used to correct partial areas, so-called benefits, on printing forms to a normal tone value, if deviations are to be expected in certain areas due to disturbances in the printing press. This ensures that the individual faces on the printing form have the same tonal values. This is important because the faces usually have the same print image as the benefit, so the benefits cut later would have a different appearance if tone differences persisted between each benefit.
- the equalization of the benefits among each other ensures that they are indistinguishable from each other and that the entire print production is colored identically.
- the object of the invention is to locally correct machine-related coloring errors.
- machine-specific properties can be maintained not only in global form but locally depending on the location of their occurrence as a function of the halftone tone values and thus significantly increase the quality of the printed product to be produced.
- the inking behavior of the printing units is determined by means of test forms for the maximum format.
- the determination for the maximum format offers the advantage of being able to use this as a reference or reference printed product and from this to be able to convert the determined inking irregularities to smaller formats.
- the inking non-uniformity of the rotary printing press can be ascertained on merely one printing unit.
- This offers the advantage that only one of several printing units must be selected, so that can be achieved in the calibration of a time advantage within the prepress by merely the evaluation of a printing unit.
- a multi-color printing machine for example, 4, 6 or 8 printing units connected in series in series, this represents a significant time advantage.
- the color separations of a printing form can be made depending on the subject in the case of image-dependent dyeing irregularities on the basis of the data of the raster image processor.
- Subject-dependent staining irregularities occur especially when areas with high halftone tone values and areas with extremely low halftone screen values are in close contact in the print.
- the determined coloring characteristics of the printing units or of the individual printing units of a multicolour rotary printing machine can be transmitted in the form of a profile to the prepress.
- the profiles can be transmitted in particular in tabular form, which makes their further processing easier in the increasingly digital pre-press.
- the solution proposed according to the invention can be used to modify the halftone tone values when specifying the halftone color value fluctuations within the prepress stage during the printing plate production.
- the modification of the raster tone values during the imaging process in the digital printing form imaging process eg in computer-to-press (direct imaging) imaging in the printing press as well as in the digital exposure of films or printing plates.
- the inking behavior of a multicolour rotary printing press whose individual printing or finishing plants are connected in series, is sufficiently well known after evaluation of test prints on the basis of previous print jobs.
- the data available from test prints or already from the preceding print jobs for inking nonuniformities with regard to ink drop in the printing direction, self-adjusting stenciling effects depending on the ink coverage and the banding are coupled by means of the proposed method according to the invention with the data incurred in the printing forme production of each print job to be executed.
- the inking nonuniformities resulting from the offset process are due to the general effect that, in this printing process, the production of the ink is continuous, but the color decrease of the ink film carrying surfaces within the printing unit is discontinuous.
- the machine-related errors in the production of printing form in the form of local Rasterertonwertver modus be kept so that they no longer in the print image to be created, which after passing through the substrate by a number of successive printing units in the overlaid printed image of multiple color separations produced or are only partially visible.
- the inking irregularities that occur are identical from one printing unit to the next, then only one printing unit can be selected for a 2, 4, 6, 8 printing units and one or more finishing units and representative of the other printing units with regard to the transfer of the data to the self-adjusting dyeing nonuniformity be transferred to the prepress. It is irrelevant whether the pre-press works in digital form or whether the individual printing forms or the color separations per printing unit are exposed or produced in a conventional manner with films.
- the dyeing irregularities occur as a function of the product, as is the case, in particular, with the stenciling effect, then the corrections concerning the dyeing nonuniformities must also be made as a function of the image.
- the subject is sufficiently well known in the production of the color separations. Since the data for sujser production, i. are known from the imaging of the printing plate in the prepress, it can be determined from the inking irregularities of the printing units of a multicolor rotary printing machine, the corresponding corrections of Därbungsun Dermat and taken into account in the production of the corresponding printing form per printing unit.
- other effects e.g.
- the drop in color of the printed product to be produced be independent of theterm.
- the corrections can be made globally, i. regardless of the print image. This means that in the corresponding printing plate production, the raster tone value generation seen over the print length compensates for the color drop that occurs in the case of the image independently of the printing length, i. holds.
- the transfer of the coloring characteristics of the individual printing units of a multi-color rotary printing press, or the required corrections, can be transmitted to the prepress in the form of a profile of, for example, a multi-dimensional look-up table. It is conceivable to couple the profile to an ICC profile of the printing machine describing the coloring behavior to which the data to be transferred to the prepress can also be attached in the form of an appendix. If a transfer of the correction data to compensate for the occurring coloring irregularities per printing unit can be standardized, a further processing of this data within the prepress stage in the printing plate production is likewise to be carried out as standard and generates there substantially less effort.
- the resolution of the dyeing irregularities to be transferred in tabular form can be adapted to the respective occurring error gradients.
- the color decay, stenciling, streaking effects can also be characterized in detail by occurring amplitude, gradients and the location of their occurrence.
- the correction of the halftone tone values in screen printing processes can be carried out at the prepress stage at two points of the printing plate production.
- both planar printing forms and sleeve-shaped printing plates can be exposed.
- the machine states i. Printing unit states are largely identical when recording the error image and the later printing, if they have influence on the fault location. If there is no influence on the location of the occurring error, it is irrelevant to take into account the respective prevailing machine states when taking the defect image and during subsequent printing.
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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 dyeing errors on rotary printing presses, which can occur as striping, color waste or as stenciling in the finished printed product whose quality.
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.Due to the construction of the offset printing units, the offset printing process does not offer the possibility of uniformly coloring a printed sheet or coloring the screen dots with a constant layer thickness for a given subject. Although the inking of the printing form mounted on the circumference of a plate cylinder is effected continuously via an offset printing unit with a color film which has previously been reduced to a specific ink film thickness by a multiplicity of friction or bridge rollers. However, the color decrease takes place discontinuously, because on the one hand, the color decrease is dependent on the subject and on the other hand, the peripheral surfaces of the printing plate receiving plate cylinder is discontinuous by the clamping channels.
Disturbances in the color transfer, for example, at the interface of the inking unit to the surface of the color cylinder to the transfer cylinder plate cylinder, at the interface between the printing forme cylinder and transfer cylinder surfaces and at the interface between the surface of the transfer cylinder, which is usually given by a rubber blanket-like elevator, with the printing substrate lead to non-uniformities, which can affect both the transferred ink layer thicknesses as well as with respect to the grid areas on the generated dot size. The resulting effects are banding, ink drop in the printing direction and stenciling effects. The connections between these phenomena in the inking unit are quite complex and can not be viewed in isolation from each other.
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.In order to achieve a high uniformity in the course of the color density or the ink layer thickness in the printing, these effects are largely taken into account in the design of inking units on rotary printing machines in the context of simulation programs and design principles, the inking unit is optimized in terms of the effects mentioned. In addition, there is the possibility, for example by influencing rollers used in the inking unit and their time of use to influence these errors. Furthermore, the selection of suitable transfer elevator surfaces, such as blankets, acting as transfer cylinder elevators, allows the occurrence of dynamically induced streaks to be reduced. However, a targeted local correction of inking color irregularities in the print is not achievable with these measures.
Aus der
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 the indicated technical problem, the object of the invention is to locally correct machine-related coloring errors.
Erfindungsgemäß wird die Aufgabe durch ein Verfahren zur Korrektur lokaler, maschinenbedingter Färbungsfehler an Rotationsdruckmaschinen gelöst, bei dem die nachfolgenden Verfahrensschritte durchlaufen werden:
- Ermittlung des Einfärbungsverhaltens der Druckwerke mittels Testformen,
- Erfassung der Färbungsungleichförmigkeiten an den Testformen und Übermittlung der Daten zur Färbungsungleichförmigkeit an die Druckvorstufe und
- Modifikation der Rastertonwerte der Farbauszügc einer Druckform derart, dass die Färbungsungleichförmigkeiten lokal abhängig vom Ort ihres Auftretens im Druck auf den Druckformen bzw. Druckfilmen vorgehalten werden und 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.
- Determination of the inking behavior of the printing units by means of test forms,
- Detection of staining nonuniformities on the test forms and transfer of the data for staining nonuniformity to the prepress and
- Modification of the Rasterertonwerte the Farbauszügc a printing form such that the Farbungsunleichförmigkeiten locally depending on the location of their occurrence in the printing on the printing forms or printing films are maintained and that the location of the correction on the surface of the respective imaged or to be exposed printing forms with the location of the Occurrence of the error in the print coincides.
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 proposed solution according to the invention are primarily to be seen in the fact that in the finished printed product disturbing strips, the color drop in the printing direction and stenciling effects are no longer visually visible or only to a small extent. It is a consideration of the printing 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.Dyeing behavior of the printing form machine-specific already in the prepress stage possible, so that the later adjusting nonuniformity effects in the color of the surface of the printing plate can be kept in the printing forme production and compensate for the later pressure. By means of the method proposed according to the invention, machine-specific properties can be maintained not only in global form but locally depending on the location of their occurrence as a function of the halftone tone values and thus significantly increase the quality of the printed product to be produced.
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 inking behavior of the printing units is determined by means of test forms for the maximum format. The determination for the maximum format offers the advantage of being able to use this as a reference or reference printed product and from this to be able to convert the determined inking 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 method proposed according to the invention, in the case of inking irregularities determined independently of the printing unit, the inking non-uniformity of the rotary printing press can be ascertained on merely one printing unit. This offers the advantage that only one of several printing units must be selected, so that can be achieved in the calibration of a time advantage within the prepress by merely the evaluation of a printing unit. In a multi-color printing machine, for example, 4, 6 or 8 printing units connected in series 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, the color separations of a printing form, be it in plate form or as a printing sleeve or a film, can be made depending on the subject in the case of image-dependent dyeing irregularities on the basis of the data of the raster image processor. Subject-dependent staining irregularities occur especially when areas with high halftone tone values and areas with extremely low halftone screen values are in close contact in the print. By means of the method proposed by the invention can not only the printing machine or printing unit-dependent behavior of the production of dyeing nonuniformities but also the coloring nonuniformities occurring due to the subject to be printed by extremely different raster 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 of the individual printing units of a multicolour rotary printing machine can be transmitted in the form of a profile to the prepress.
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 transmitted in particular in tabular form, which makes their further processing easier in the increasingly digital pre-press.
Denkbar ist auch eine Übertragung der Färbungscharakteristika in Form von Amplitude, Gradient, Position im Bild etc..Also conceivable is a transfer of the coloring characteristics in the form of amplitude, gradient, position in the picture 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 matched to the error gradients of the dyeing nonuniformities. The solution proposed according to the invention can be used to modify the halftone tone values when specifying the halftone color value fluctuations within the prepress stage during the printing plate production. Thus, a later to be used in the corresponding printing unit printing plate, whether in plate or in sleeve form, so prepared that the self-adjusting dyeing irregularities are kept. In addition, with digital equipment of the corresponding pre-press within the pre-press, the modification of the raster tone values during the imaging process in the digital printing form imaging process eg in computer-to-press (direct imaging) imaging in the printing press as well as in the digital 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 multicolour rotary printing press, whose individual printing or finishing plants are connected in series, is sufficiently well known after evaluation of test prints on the basis of previous print jobs. The data available from test prints or already from the preceding print jobs for inking nonuniformities with regard to ink drop in the printing direction, self-adjusting stenciling effects depending on the ink coverage and the banding are coupled by means of the proposed method according to the invention with the data incurred in the printing forme production of each print job to be executed.
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 inking nonuniformities resulting from the offset process are due to the general effect that, in this printing process, the production of the ink is continuous, but the color decrease of the ink film carrying surfaces within the printing unit is discontinuous. With the proposed method according to the invention, the machine-related errors in the production of printing form in the form of local Rasterertonwertveränderungen be kept so that they no longer in the print image to be created, which after passing through the substrate by a number of successive printing units in the overlaid printed image of multiple color separations produced or are only 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.In the characterization, all the printing units of a multicolor rotary printing machine must be examined for the dyeing nonuniformities and the printing forms to be used in the respective printing units must be differently reserved with respect to the dyeing nonuniformities.
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.If the inking irregularities that occur are identical from one printing unit to the next, then only one printing unit can be selected for a 2, 4, 6, 8 printing units and one or more finishing units and representative of the other printing units with regard to the transfer of the data to the self-adjusting dyeing nonuniformity be transferred to the prepress. It is irrelevant whether the pre-press works in digital form or whether the individual printing forms or the color separations per printing unit are exposed or produced in a conventional manner 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.If, on the other hand, the dyeing irregularities occur as a function of the product, as is the case, in particular, with the stenciling effect, then the corrections concerning the dyeing nonuniformities must also be made as a function of the image. In the printing form production in the prepress stage, however, the subject is sufficiently well known in the production of the color separations. Since the data for sujser production, i. are known from the imaging of the printing plate in the prepress, it can be determined from the inking irregularities of the printing units of a multicolor rotary printing machine, the corresponding corrections of Därbungsungleichförmigkeiten and taken into account in the production of the corresponding printing form per printing unit. In addition to the stenciling effects, other effects, e.g. the drop in color of the printed product to be produced be independent of the sujet. In this type of coloration non-uniformity, the corrections can be made globally, i. regardless of the print image. This means that in the corresponding printing plate production, the raster tone value generation seen over the print length compensates for the color drop that occurs in the case of the image independently of the printing length, i. 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 of a multi-color rotary printing press, or the required corrections, can be transmitted to the prepress in the form of a profile of, for example, a multi-dimensional look-up table. It is conceivable to couple the profile to an ICC profile of the printing machine describing the coloring behavior to which the data to be transferred to the prepress can also be attached in the form of an appendix. If a transfer of the correction data to compensate for the occurring coloring irregularities per printing unit can be standardized, a further processing of this data within the prepress stage in the printing plate production is likewise to be carried out as standard and generates there substantially less effort. The resolution of the dyeing irregularities to be transferred in tabular form can be adapted to the respective occurring error gradients. In addition to the characterization of the dyeing non-uniformities by the error gradient, the color decay, stenciling, streaking effects can also be characterized in detail by occurring amplitude, gradients and the location of their occurrence. The more accurate and unambiguous the occurring coloration irregularities of the individual printing units of a rotary printing machine are known, and the more data to occur, with respect to the local occurrence of the errors are known, the more accurate can be held in the printing forme a compensation of these effects, which causes the occurring Effects per printing unit are hardly more or completely invisible later in the print.
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 halftone tone values in screen printing processes can be carried out at the prepress stage at two points of the printing plate production. In the raster image processing of the image data, or in the imaging process in a digital plate or film imagesetter or in the computer-to-press process, both planar printing forms and sleeve-shaped printing plates can be exposed. With the method proposed according to the invention, it can be ensured that the location of the correction on the surface of the respective printing plates to be imaged or to be exposed coincides with the location of the occurrence of the error in the printing. Only in this way can occurring color irregularities be compensated locally, or maintained in the production of the corresponding color separation of a printing form, so that the self-adjusting effects of color waste or self-adjusting stencil effects compensate for stencilling-prone subjects. Advantageously, it is ensured that the machine states, i. Printing unit states are largely identical when recording the error image and the later printing, if they have influence on the fault location. If there is no influence on the location of the occurring error, it is irrelevant to take into account the respective prevailing machine states when taking the defect image and during subsequent printing.
Claims (10)
- Method of correcting local, machine-based inking errors in rotary printing presses comprising the following steps:• determining the inking behaviour of the printing units by means of test forms;• registering the inking non-uniformities on the test forms and transmitting the data about inking non-uniformity to the pre-press stage; and• modifying the screen tone values of the colour separations of a printing plate in such a way that the inking non-uniformities are compensated locally on the printing plates or films on the basis of the location of their occurrence in the print and that the correction location on the surface of the respective printing forms to be imaged or exposed coincides with the location of the occurrence of the error in the print.
- Method according to Claim 1,
characterized in
that the inking behaviour of the printing units is determined by means of test forms for the maximum format. - Method according to Claim 1,
characterized in
that in the case of inking non-uniformities that occur independently of the printing unit, these inking non-uniformities are determined in one printing unit representative of all. - Method according to Claim 1,
characterized in
that in the case of subject-dependent inking non-uniformities, the modification of the colour separations of a printing plate or film is carried out in a subject-dependent way based on the data, image data or colour separation data. - Method according to Claim 1,
characterized in
that the determined inking characteristics of the printing press are transferred to the prepress department in the form of a profile or other inking standard. - Method according to Claim 5,
characterized in
that the profile is transferred in tabular form. - Method according to Claim 5,
characterized in
that the resolution of the profile corresponds to the error gradient of the inking non-uniformities. - Method according to Claim 1,
characterized in
that the modification of the screen tone values are taken into account in the determination of the screen tone values for the production of the printing plate. - Method according to Claim 1,
characterized in
that the modification of the screen tone values is carried out in the imaging operation in the digital platesetter or filmsetter or, in the case of DI (direct imaging), directly in the machine. - Method according to Claim 1,
characterized in
that print jobs suitable as test forms are used for determining the inking non-uniformities.
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 EP1184176A2 (en) | 2002-03-06 |
| EP1184176A3 EP1184176A3 (en) | 2004-01-21 |
| EP1184176B1 true EP1184176B1 (en) | 2008-03-05 |
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ID=7654357
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| 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 |
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| US (1) | US6694883B2 (en) |
| EP (1) | EP1184176B1 (en) |
| JP (1) | JP5280598B2 (en) |
| AT (1) | ATE388018T1 (en) |
| CA (1) | CA2353289C (en) |
| DE (2) | DE10042680A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| WO2005029209A1 (en) * | 2003-08-19 | 2005-03-31 | Medigraph Gmbh | Control method for production processes with color-relevant products and printing outcome control method |
| DE102005041179A1 (en) * | 2005-08-31 | 2007-03-01 | Man Roland Druckmaschinen Ag | Typographic process e.g. color registering, regulating method for printing machine, involves determining pre-press based target value from pre-press data and under consideration of data about characteristic of sensor |
| US7586656B2 (en) * | 2006-06-06 | 2009-09-08 | E. I. Du Pont De Nemours And Company | Process for producing optimised printing forms |
| DE102006029618A1 (en) * | 2006-06-23 | 2007-12-27 | Dieter Kirchner | Test mold for determining the condition and setting of the dampening system of an offset printing press and method for adjustment |
| EP1916100B1 (en) | 2006-10-26 | 2014-03-05 | Heidelberger Druckmaschinen Aktiengesellschaft | Printing plate generation for anilox printing presses |
| 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 |
| DE102008031735B4 (en) | 2007-07-10 | 2019-11-07 | Heidelberger Druckmaschinen Ag | Gray balance correction of a printing process |
| 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 |
| DE102009046594A1 (en) * | 2009-11-10 | 2011-05-12 | Manroland Ag | Method for controlling a printing process |
| 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 |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3925533C2 (en) * | 1989-08-02 | 1995-08-17 | Krause Biagosch Gmbh | Process for the production of printing forms |
| JP2824334B2 (en) * | 1990-12-27 | 1998-11-11 | 三菱重工業株式会社 | Automatic color tone controller for printed materials |
| DE4209165A1 (en) * | 1991-03-21 | 1992-09-24 | Wifag Maschf | METHOD FOR SETTING THE GRID DOTS FOR AN OFFSET ROTATION PRINTING MACHINE |
| DE4328026A1 (en) * | 1993-08-20 | 1995-03-09 | Roland Man Druckmasch | Communication method and system for computer-aided printing |
| DE4334712A1 (en) * | 1993-10-12 | 1995-04-13 | Heidelberger Druckmasch Ag | Reproduction system |
| DE19506425B4 (en) * | 1995-02-24 | 2004-11-18 | Heidelberger Druckmaschinen Ag | Offset printing process |
| US5903712A (en) * | 1995-10-05 | 1999-05-11 | Goss Graphic Systems, Inc. | Ink separation device for printing press ink feed control |
| EP0770480B1 (en) * | 1995-10-25 | 2001-12-19 | Heidelberger Druckmaschinen Aktiengesellschaft | Printing press with register control system |
| CA2236897A1 (en) * | 1997-05-15 | 1998-11-15 | Presstek, Inc. | Distributed imaging and control architecture for digital printing presses and platesetters |
| DE19822662C2 (en) * | 1998-05-20 | 2003-12-24 | Roland Man Druckmasch | Process for color reproduction on an image data oriented printing machine |
| DE19844495B4 (en) * | 1998-09-29 | 2005-04-07 | Man Roland Druckmaschinen Ag | Method for color calibration by means of color management for a digitally controllable printing press with a rewritable printing form |
| US6220157B1 (en) * | 1999-03-23 | 2001-04-24 | Paper Converting Machine Company | Printing press with in-line central impression cylinders |
-
2000
- 2000-08-31 DE DE10042680A patent/DE10042680A1/en not_active Withdrawn
-
2001
- 2001-07-20 CA CA002353289A patent/CA2353289C/en not_active Expired - Fee Related
- 2001-07-30 AT AT01117735T patent/ATE388018T1/en not_active IP Right Cessation
- 2001-07-30 EP EP01117735A patent/EP1184176B1/en not_active Expired - Lifetime
- 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
Also Published As
| Publication number | Publication date |
|---|---|
| CA2353289C (en) | 2008-12-30 |
| US20020043172A1 (en) | 2002-04-18 |
| EP1184176A2 (en) | 2002-03-06 |
| JP5280598B2 (en) | 2013-09-04 |
| EP1184176A3 (en) | 2004-01-21 |
| DE50113682D1 (en) | 2008-04-17 |
| ATE388018T1 (en) | 2008-03-15 |
| CA2353289A1 (en) | 2002-02-28 |
| JP2002113842A (en) | 2002-04-16 |
| DE10042680A1 (en) | 2002-03-14 |
| US6694883B2 (en) | 2004-02-24 |
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