EP0490093B1 - Method for controlling inking of printed products - Google Patents
Method for controlling inking of printed products Download PDFInfo
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- EP0490093B1 EP0490093B1 EP91119212A EP91119212A EP0490093B1 EP 0490093 B1 EP0490093 B1 EP 0490093B1 EP 91119212 A EP91119212 A EP 91119212A EP 91119212 A EP91119212 A EP 91119212A EP 0490093 B1 EP0490093 B1 EP 0490093B1
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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
- B41F33/0045—Devices for scanning or checking the printed matter for quality control for automatically regulating the ink supply
Definitions
- the invention relates to a method for controlling the coloring of printed products according to the preamble of the first claim.
- a print control strip is printed on the sheet, which contains either halftone or full-tone measuring fields for each color metering zone.
- Target color densities are specified for these measuring fields.
- sheets are drawn and the color densities of these measuring fields are determined by means of appropriate devices, whereupon the ink metering zones are automatically regulated until the measured color densities and the predetermined target color densities are the same within a predetermined tolerance range.
- target color densities halftone / full tone
- DE 34 40 706 A1 discloses a method for controlling the coloring of printed products, in which the area coverage achieved in printing is compared with a target area coverage (template) and target color densities are formed from this comparison (the difference).
- the actual area coverage for a color is determined densitometrically on the basis of at least one pair of measuring fields present in the print control strip, consisting of a halftone and full-tone measuring field.
- Using the formula of Murray-Davies then determines the actual area coverage from the color density of the solid tone and that of the halftone measuring field.
- New target color densities for screen tone and full tone are then formed from the target-actual area coverage deviation.
- the ink metering zones are then regulated in accordance with these new target ink densities.
- the print control strip contains screen tone measuring fields in each color metering zone.
- setpoints namely the setpoints of the area coverings, can be directly metrologically adopted from an OK sheet (pressure) produced by another printing process.
- the corresponding conversion factors must be determined empirically and known very precisely. An error with which these factors are known does not affect the control accuracy - if the target-actual difference of the area coverage becomes zero, then the target-actual difference of the corresponding color densities also becomes zero - however, how Explicitly stated in this document, imprecise knowledge of the conversion factors can cause over- or under-regulation.
- control steps are necessary, in which a corresponding amount of waste is incurred. Additional control steps are then caused by the over- or under-regulation, caused by the imprecise knowledge of the conversion factors.
- the invention can be used in the entire field of autotypically operating printing machines, so it can be used in sheetfed and web offset printing machines, sheetfed and web presses in gravure printing, etc.
- FIG. 1 showing the relationship between area coverage and full tone / screen tone color density.
- the color guide is set up on a multi-color sheetfed offset printing machine according to a predetermined target area coverage FD target for each color.
- a print control strip is also printed on each print sheet, which has measurement fields with a screen tone value of, for example, 80% for all colors in each color metering zone.
- this print control strip also has a full tone measuring field for each color in at least one color metering zone.
- the color densities are measured with a traversing densitometer, as known from DE-AS 27 28 738.
- An example of the print control strip described is the 6-color CCI print control strip from MAN Roland Druckmaschinen AG.
- each inking unit is preset by known methods, for example by values which resulted in a printing plate scan. Printing is then started and, after establishing a steady state of color, a first sheet is drawn and measured. Control processes for a color, for example black, are also described. The same procedure is followed for the other colors.
- the first measurement showed, for example, the actual full-tone color densities DV N1 and DV M1 on the full-tone measuring fields in the color metering zones N, M (FIG. 1).
- 1, as can be seen, is modeled on the Fogra network table, in which the curves of the area coverings are plotted according to the Murray-Davies formula in the solid color density (DV) - halftone color density (DR) plane.
- Actual surface coverage FD N1 , FD M1 is achieved in points N1, M1 with the raster tone color densities associated with the solid color densities DV N1 , DV M1 .
- the actual area coverage FD N1 achieved in ink metering zone N is smaller, and the actual area coverage FD M1 achieved in ink metering zone M is greater than the predetermined target area coverage FD Soll .
- target values for the screen color densities DR N1 target , DR M1 target are formed using the Murray-Davies formula.
- n full-tone color densities DV and the specified target area coverage FD target n are used to form n target screen tone color densities using the Murray-Davies formula. It is then arithmetically averaged over these n target raster tone color densities. The arithmetic mean value obtained then serves as the target screen color density for all ink metering zones, which are regulated accordingly.
- the first regulation when setting up will generally not lead directly to the target value of the area coverage FD target , but only approximate it.
- a second measurement on the full-tone measuring fields - again in the ink metering zones N and M - will lead to points N2, M2 in the diagram according to FIG. 1.
- the area coverage now achieved in the ink metering zones N, M has approximated the target area coverage FD target .
- the procedure is now the same as before. From the spot color densities now measured and the predetermined target area coverage FD target , target raster color tone densities are again calculated using the Murray-Davies formula. These are again averaged and the mean value obtained in this way is the target screen tone color density for the remaining ink metering zones.
- the method according to the invention is therefore applied iteratively, with new target raster tone color densities being determined in each control step from the measured solid color densities and the predetermined target area coverage.
- the greatest possible approximation of the area coverage achieved in printing to the target area coverage FD Soll is achieved, since an increase / decrease in the halftone color densities brings about an increase / decrease in the corresponding solid color densities by appropriate adjustment of color metering elements.
- n target screen color densities using the Murray-Davies formula As an alternative to the procedure described above, according to which from general n solid color densities in the corresponding Color dosing zones are first calculated n target screen color densities using the Murray-Davies formula and then an arithmetic mean is determined from these n target screen color densities can also be arithmetically averaged over the n measured solid color densities.
- a new target screen color density value is calculated from the mean value of the spot color density obtained in this way, by specifying the target area coverage FD target and using the Murray-Davies formula. This target screen tone color density value then applies as the target specification for all ink metering zones. These are regulated accordingly.
- the Murray-Davies formula is only used once for each of the full-tone measuring fields in the print control strip.
- the method according to the invention described so far cannot only be used when setting up the color guide.
- target coloring target area coverage
- Sheets are also obtained and measured at regular intervals in production printing. As long as the area coverage determined on this arch does not deviate too much from the target area coverage, the color guidance is not changed. If, however, a larger deviation is found, then how the desired solid color color densities are determined from the measured solid color densities in the setup phase is then regulated accordingly.
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- Inking, Control Or Cleaning Of Printing Machines (AREA)
- Coloring (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zur Steuerung der Farbgebung von Druckerzeugnissen gemäß dem Oberbegriff des ersten Patentanspruches.The invention relates to a method for controlling the coloring of printed products according to the preamble of the first claim.
Aus dem Bereich des Bogenoffsetdruckes ist es bekannt, die Färbung von Druckerzeugnissen entweder nach Volltonfarbdichte oder Rastertonfarbdichte zu regeln. Hierzu wird auf dem Bogen ein Druckkontrollstreifen mitgedruckt, der für jede Farbdosierzone entweder Raster- oder Volltonmeßfelder enthält. Eben für diese Meßfelder werden Sollfarbdichten vorgegeben. Während des Druckes werden Bogen gezogen und mittels entsprechender Vorrichtungen die Farbdichten dieser Meßfelder bestimmt, woraufhin eine automatische Regelung der Farbdosierzonen erfolgt, bis die gemessenen Farbdichten und die vorgegebenen Sollfarbdichten innerhalb eines vorgegebenen Toleranzbereiches gleich sind. Nicht möglich jedoch ist die meßtechnische Übernahme von Sollfarbdichten (Rasterton/Vollton) von einer Vorlage, die unter anderen Druckbedingungen hergestellt wurde. Der Grund hierfür liegt darin, daß Farbdichtewerte nur für eine Druckfarben-Bedruckstoffkombination Aussagekraft besitzen.From the field of sheetfed offset printing, it is known to regulate the coloration of printed products either according to solid color density or screen color density. For this purpose, a print control strip is printed on the sheet, which contains either halftone or full-tone measuring fields for each color metering zone. Target color densities are specified for these measuring fields. During printing, sheets are drawn and the color densities of these measuring fields are determined by means of appropriate devices, whereupon the ink metering zones are automatically regulated until the measured color densities and the predetermined target color densities are the same within a predetermined tolerance range. However, it is not possible to use target color densities (halftone / full tone) from a template that was produced under different printing conditions. The reason for this is that ink density values are meaningful only for an ink-substrate combination.
Aus der DE 34 40 706 A1 ist ein Verfahren zur Steuerung der Farbgebung von Druckerzeugnissen bekannt, bei dem die im Druck erreichte Flächendeckung mit einer Soll-Flächendeckung (Vorlage) verglichen wird und aus diesem Vergleich (der Differenz) Sollfarbdichten gebildet werden. Die Ist-Flächendeckung für eine Farbe wird anhand von mindestens einem im Druckkontrollstreifen vorhandenen Meßfeldpaar, bestehend aus einem Rasterton- und Volltonmeßfeld, densitometrisch bestimmt. Unter Anwendung der Formel von Murray-Davies wird dann aus der Farbdichte des Vollton- und der des Rastertonmeßfeldes die Ist-Flächendeckung bestimmt. Aus der Soll-Ist-Flächendeckungsabweichung werden dann neue Soll-Farbdichten für Rasterton und Vollton gebildet. Gemäß diesen neuen Soll-Farbdichten werden dann die Farbdosierzonen geregelt. Der Druckkontrollstreifen enthält dabei in jeder Farbdosierzone Rastertonmeßfelder. Mittels diesem in der eingangs genannten Schrift genauer beschriebenen Verfahren können Sollwerte, nämlich die Sollwerte der Flächendeckungen direkt meßtechnisch von einem nach einem anderen Druckverfahren hergestellten OK-Bogen (Andruck) übernommen werden.DE 34 40 706 A1 discloses a method for controlling the coloring of printed products, in which the area coverage achieved in printing is compared with a target area coverage (template) and target color densities are formed from this comparison (the difference). The actual area coverage for a color is determined densitometrically on the basis of at least one pair of measuring fields present in the print control strip, consisting of a halftone and full-tone measuring field. Using the formula of Murray-Davies then determines the actual area coverage from the color density of the solid tone and that of the halftone measuring field. New target color densities for screen tone and full tone are then formed from the target-actual area coverage deviation. The ink metering zones are then regulated in accordance with these new target ink densities. The print control strip contains screen tone measuring fields in each color metering zone. Using this method, which is described in more detail in the document mentioned at the outset, setpoints, namely the setpoints of the area coverings, can be directly metrologically adopted from an OK sheet (pressure) produced by another printing process.
Nachteilig bei dem voranstehend geschilderten Verfahren gemäß der eingangs genannten Schrift ist jedoch, daß von einer linearen Abhängigkeit zwischen den zu ermittelnden Soll-Ist-Differenzen der Vollton- bzw. Rastertonfarbdichten und der Soll-Ist-Differenz der Flächendeckungen ausgegangen wird. Die entsprechenden Umrechnungsfaktoren müssen empirisch bestimmt und sehr genau bekannt sein. Ein Fehler mit dem diese Faktoren bekannt sind, wirkt sich zwar nicht auf die Regelgenauigkeit aus - wenn die Soll-Ist-Differenz der Flächendeckungen zu Null wird, dann werden auch die Soll-Ist-Differenzen der entsprechenden Farbdichten zu Null - jedoch wird, wie in dieser Schrift explizit angeführt, eine ungenaue Kenntnis der Umrechnungsfaktoren ein Über- oder Unterregeln bewirken. Gerade in der Einrichtphase, in welcher die Farbführung auf eine Sollfärbung abgestimmt wird, sind mehrere Regelschritte notwendig, bei welchen entsprechend viel Makulatur anfällt. Durch das Über- oder Unterregeln, verursacht durch die ungenaue Kenntnis der Umrechnungsfaktoren, werden dann zusätzliche Regelschritte verursacht.A disadvantage of the above-described method according to the document cited at the outset, however, is that a linear dependency between the target-actual differences to be determined of the solid or halftone color densities and the target-actual difference of the area coverage is assumed. The corresponding conversion factors must be determined empirically and known very precisely. An error with which these factors are known does not affect the control accuracy - if the target-actual difference of the area coverage becomes zero, then the target-actual difference of the corresponding color densities also becomes zero - however, how Explicitly stated in this document, imprecise knowledge of the conversion factors can cause over- or under-regulation. Especially in the set-up phase, in which the color scheme is matched to a target color, several control steps are necessary, in which a corresponding amount of waste is incurred. Additional control steps are then caused by the over- or under-regulation, caused by the imprecise knowledge of the conversion factors.
Aufgabe der vorliegenden Erfindung ist es somit, ein Verfahren zur Steuerung der Farbgebung von Druckerzeugnissen zu schaffen, mittels dem das Einrichten der Farbführung auf eine Soll-Flächendeckung mit einem Minimum von Regelschritten erreicht wird.It is therefore an object of the present invention to provide a method for controlling the coloring of printed products, by means of which the setting up of the ink guide to a desired area coverage is achieved with a minimum of control steps.
Gelöst wird diese Aufgabe durch die kennzeichnenden Merkmale des ersten Patentanspruches. Vorteilhafte Ausgestaltungen des erfindungsgemäßen Verfahrens ergeben sich aus den Unteransprüchen in Verbindung mit der Beschreibung.This object is achieved by the characterizing features of the first claim. Advantageous refinements of the method according to the invention result from the subclaims in connection with the description.
Die Erfindung läßt sich im gesamten Bereich autotypisch arbeitender Druckmaschinen anwenden, ist also bei Bogen- und Rollenoffsetdruckmaschinen, Bogen- und Rollenmaschinen des Raster-Tiefdruckes usw. verwendbar.The invention can be used in the entire field of autotypically operating printing machines, so it can be used in sheetfed and web offset printing machines, sheetfed and web presses in gravure printing, etc.
Das erfindungsgemäße Verfahren wird nun nachstehend in Verbindung mit Fig. 1 näher erläutert, wobei Fig. 1 den Zusammenhang von Flächendeckung und Vollton-/Rastertonfarbdichte zeigt. Eingerichtet wird die Farbführung an einer Mehrfarben-Bogenoffsetdruckmaschine nach einer vorgegebenen Soll-Flächendeckung FDSoll für jede Farbe. Mitgedruckt wird auf jedem Druckbogen ein Druckkontrollstreifen, welcher in jeder Farbdosierzone für alle Farben Meßfelder mit einem Rastertonwert von beispielsweise 80% aufweist. Zusätzlich weist dieser Druckkontrollstreifen für jede Farbe in wenigstens einer Farbdosierzone zusätzlich noch ein Volltonmeßfeld auf. Gemessen werden die Farbdichten mit einem traversierenden Densitometer, wie aus der DE-AS 27 28 738 bekannt. Ein Beispiel für den beschriebenen Druckkontrollstreifen ist der 6-Farb-CCI-Druckkontrollstreifen der MAN Roland Druckmaschinen AG.The method according to the invention is now explained in more detail below in connection with FIG. 1, FIG. 1 showing the relationship between area coverage and full tone / screen tone color density. The color guide is set up on a multi-color sheetfed offset printing machine according to a predetermined target area coverage FD target for each color. A print control strip is also printed on each print sheet, which has measurement fields with a screen tone value of, for example, 80% for all colors in each color metering zone. In addition, this print control strip also has a full tone measuring field for each color in at least one color metering zone. The color densities are measured with a traversing densitometer, as known from DE-AS 27 28 738. An example of the print control strip described is the 6-color CCI print control strip from MAN Roland Druckmaschinen AG.
Bei Beginn des Einrichtens werden keine Soll-Farbdichten - hier Rastertonfarbdichten - vorgegeben. Es liegt lediglich für jede Farbe eine Soll-Flächendeckung FDSoll vor. Die Farbdosierelemente in jedem Farbwerk werden nach bekannten Verfahren voreingestellt, z.B. nach Werten, welche eine Druckplattenabtastung ergab. Es wird dann mit dem Druck begonnen und nach Feststellen eines stationären Färbungszustandes ein erster Bogen gezogen und gemessen. Beschrieben werden desweiteren Regelvorgänge für eine Farbe, beispielsweise Schwarz. Bei den übrigen Farben wird entsprechend verfahren.At the start of the setup, no target color densities - here, halftone color densities - are specified. There is only a target area coverage FD target for each color. The ink metering elements in each inking unit are preset by known methods, for example by values which resulted in a printing plate scan. Printing is then started and, after establishing a steady state of color, a first sheet is drawn and measured. Control processes for a color, for example black, are also described. The same procedure is followed for the other colors.
Die erste Messung ergab beispielsweise an den Volltonmeßfeldern in den Farbdosierzonen N, M die Ist-Volltonfarbdichten DVN1 und DVM1 (Fig. 1). Fig. 1 ist dabei, wie zu erkennen, der Fogra-Netztafel nachempfunden, bei welcher die Kurven der Flächendeckungen gemäß der Formel von Murray-Davies in der Volltonfarbdichte (DV) - Rastertonfarbdichte (DR) - Ebene aufgetragen sind. Mit den zu den Volltonfarbdichten DVN1, DVM1 zugehörigen Rastertonfarbdichten werden Ist-Flachendeckungen FDN1, FDM1 in den Punkten N1, M1 erreicht. Im Beispiel nach Fig. 1 ist die in Farbdosierzone N erreichte Ist-Flächendeckung FDN1 kleiner, die in Farbdosierzone M erreichte Ist-Flächendeckung FDM1 größer als die vorgegebene Soll-Flachendeckung FDSoll.The first measurement showed, for example, the actual full-tone color densities DV N1 and DV M1 on the full-tone measuring fields in the color metering zones N, M (FIG. 1). 1, as can be seen, is modeled on the Fogra network table, in which the curves of the area coverings are plotted according to the Murray-Davies formula in the solid color density (DV) - halftone color density (DR) plane. Actual surface coverage FD N1 , FD M1 is achieved in points N1, M1 with the raster tone color densities associated with the solid color densities DV N1 , DV M1 . In the example according to FIG. 1, the actual area coverage FD N1 achieved in ink metering zone N is smaller, and the actual area coverage FD M1 achieved in ink metering zone M is greater than the predetermined target area coverage FD Soll .
Mittels den in den Farbdosierzonen N und M gemessenen Volltonfarbdichten DVN1, DVM1 und der vorgegebenen Soll-Flächendeckung FDSoll werden unter Anwendung der Formel von Murray-Davies Sollwerte für die Rastertonfarbdichten DRN1 Soll, DRM1 Soll gebildet. Formelmäßig gilt somit für diese Soll-Rastertonfarbdichten:
wobei hier für das Papierweiß bzw. den reinen Bedruckstoff eine Farbdichte von Null angenommen wird. Der allgemeine Ausdruck für diese Formel ergibt sich, wenn die jeweils rechts neben der Klammer stehende "1" durch 10-DP ersetzt wird, wobei DP die Farbdichte des Papierweiß bzw. des Bedruckstoffes ist.
Für alle Farbdosierzonen wird nun eine Soll-Rastertonfarbdichte gewählt, welche das aritmethische Mittel aus DRN1 Soll und DRM1Soll ist. Entsprechend dieser Soll-Rastertonfarbdichte werden somit alle Farbdosierzonen geregelt.By means of the solid color densities DV N1 , DV M1 measured in the color metering zones N and M and the predetermined target area coverage FD target , target values for the screen color densities DR N1 target , DR M1 target are formed using the Murray-Davies formula. In terms of formulas, the following applies to these target halftone color densities:
whereby a color density of zero is assumed for the paper white or the pure printing material. The general expression for this formula is obtained when the "1" to the right of the parenthesis is replaced by 10 -DP , where DP is the color density of the paper white or the substrate.
A target raster color density is now selected for all ink metering zones, which is the arithmetic mean of DR N1 target and DR M1 target . All ink metering zones are thus regulated in accordance with this target raster tone color density.
Sind nicht, wie im bisherigen Erläuterungsbeispiel im Druckkontrollstreifen nur zwei zusätzliche Volltonmeßfelder vorhanden, sondern allgemein n, so werden aus diesen n Volltonfarbdichten DV und der vorgegebenen Soll-Flächendeckung FDSoll n Soll-Rastertonfarbdichten unter Anwendung der Formel von Murray-Davies gebildet. Es wird dann über diese n Soll-Rastertonfarbdichten arithmetrisch gemittelt. Der erhaltene arithmetische Mittelwert dient dann als Soll-Rastertonfarbdichte für alle Farbdosierzonen, die entsprechend geregelt werden.If, as in the previous explanatory example in the print control strip, there are not only two additional full-tone measurement fields, but generally n, then n full-tone color densities DV and the specified target area coverage FD target n are used to form n target screen tone color densities using the Murray-Davies formula. It is then arithmetically averaged over these n target raster tone color densities. The arithmetic mean value obtained then serves as the target screen color density for all ink metering zones, which are regulated accordingly.
Die erste Regelung beim Einrichten wird im allgemeinen nicht gleich zum Sollwert der Flächendeckung FDSoll führen, sondern diesen nur annähern. Eine zweite Messung an den Volltonmeßfeldern - also wieder in den Farbdosierzonen N und M - wird im Diagramm nach Fig. 1 zu den Punkten N2, M2 führen. Die nun erreichten Flächendeckungen in den Farbdosierzonen N, M haben sich der Soll-Flächendeckung FDSoll angenähert. In einem zweiten Regelschritt wird nun genauso verfahren wie bisher. Aus den nun gemessenen Volltonfarbdichten und der vorgegebenen Soll-Flächendeckung FDSoll werden wieder mittels der Formel von Murray-Davies Soll-Rasterfarbtondichten errechnet. Diese werden wiederum gemittelt und der so erhaltene Mittelwert gilt als Soll-Rastertonfarbdichte für die übrigen Farbdosierzonen.The first regulation when setting up will generally not lead directly to the target value of the area coverage FD target , but only approximate it. A second measurement on the full-tone measuring fields - again in the ink metering zones N and M - will lead to points N2, M2 in the diagram according to FIG. 1. The area coverage now achieved in the ink metering zones N, M has approximated the target area coverage FD target . In a second control step, the procedure is now the same as before. From the spot color densities now measured and the predetermined target area coverage FD target , target raster color tone densities are again calculated using the Murray-Davies formula. These are again averaged and the mean value obtained in this way is the target screen tone color density for the remaining ink metering zones.
Das erfindungsgemäße Verfahren wird also iterativ angewendet, wobei bei jedem Regelschritt aus den gemessenen Volltonfarbdichten und der vorgegebenen Soll-Flächendeckung neue Soll-Rastertonfarbdichten bestimmt werden. Mit dem Verfahren gemäß der Erfindung wird eine größtmögliche Annäherung der im Druck erreichten Flächendeckung an die Soll-Flächendeckung FDSoll erreicht, da eine Erhöhung/Erniedrigung der Rastertonfarbdichten durch entsprechendes Verstellen von Farbdosierelementen eine Erhöhung/Erniedrigung der entsprechenden Volltonfarbdichten bewirkt.The method according to the invention is therefore applied iteratively, with new target raster tone color densities being determined in each control step from the measured solid color densities and the predetermined target area coverage. With the method according to the invention the greatest possible approximation of the area coverage achieved in printing to the target area coverage FD Soll is achieved, since an increase / decrease in the halftone color densities brings about an increase / decrease in the corresponding solid color densities by appropriate adjustment of color metering elements.
Alternativ zu der voranbeschriebenen Vorgehensweise, wonach aus allgemein n Volltonfarbdichten in den entsprechenden Farbdosierzonen zunächst n Soll-Rastertonfarbdichten unter Verwendung der Formel von Murray-Davies berechnet werden und anschließend ein arithmetischer Mittelwert aus diesen n Soll-Rastertonfarbdichten bestimmt wird, kann auch gleich über die n gemessenen Volltonfarbdichten arithmetisch gemittelt werden. Aus dem so erhaltenen Mittelwert der Volltonfarbdichte wird unter Vorgabe der Soll-Flächendeckung FDSoll und Anwendung der Formel von Murray-Davies ein neuer Soll-Rastertonfarbdichtewert errechnet. Dieser Soll-Rastertonfarbdichtewert gilt dann als Sollvorgabe für alle Farbdosierzonen. Entsprechend werden diese geregelt. In dieser Alternative findet die Formel von Murray-Davies bei n im Druckkontrollstreifen vorhandenen Volltonmeßfeldern pro Farbe nur einmal Anwendung.As an alternative to the procedure described above, according to which from general n solid color densities in the corresponding Color dosing zones are first calculated n target screen color densities using the Murray-Davies formula and then an arithmetic mean is determined from these n target screen color densities can also be arithmetically averaged over the n measured solid color densities. A new target screen color density value is calculated from the mean value of the spot color density obtained in this way, by specifying the target area coverage FD target and using the Murray-Davies formula. This target screen tone color density value then applies as the target specification for all ink metering zones. These are regulated accordingly. In this alternative, the Murray-Davies formula is only used once for each of the full-tone measuring fields in the print control strip.
Das bisher beschriebene Verfahren gemäß der Erfindung läßt sich jedoch nicht nur beim Einrichten der Farbführung anwenden. Nach Erreichen der Soll-Färbung (Soll-Flächendeckung) wird mit dem Fortdruck begonnen. Auch im Fortdruck werden in regelmäßigen Abständen Bogen bezogen und diese gemessen. Solange die an diesen Bogen bestimmte Flächendeckungen nicht allzu stark von der Soll-Flächendeckung abweicht, wird die Farbführung nicht verändert. Wird jedoch eine größere Abweichung festgestellt, so werden, wie in der Einrichtphase aus den gemessenen Volltonfarbdichten neue Soll-Rastertonfarbdichten bestimmt, entsprechend wird dann geregelt.However, the method according to the invention described so far cannot only be used when setting up the color guide. After the target coloring (target area coverage) has been reached, production continues. Sheets are also obtained and measured at regular intervals in production printing. As long as the area coverage determined on this arch does not deviate too much from the target area coverage, the color guidance is not changed. If, however, a larger deviation is found, then how the desired solid color color densities are determined from the measured solid color densities in the setup phase is then regulated accordingly.
Claims (3)
- Process for control of the inking of printed products which are made on a self-adjusting working printing press, particularly an offset sheet printing press, wherein a print control strip co-printed with each print production for each ink in each ink metering zone has raster tone measuring fields with a given raster tone value and additionally has a full tone measuring field in at least one ink metering zone, these metering fields are densitometrically sensed, the ink metering elements in the ink metering zones are adjusted according to a desired value/actual value comparison of the raster tone image densities, wherein the desired values for the raster tone image densities are chosen in such a way that the surface coverage achieved in the printing approximates to a predetermined desired surface coverage,
characterised in that the desired raster tone ink density DRSoll is calculated after each measuring process from the full tone ink density(ies) DV of the full tone measuring field(s) as well as from the predetermined desired surface coverage FDSoll using the formula of Murray-Davies:
- Process according to Claim 1, characterised in that for n full tone measuring fields present in the print control strip from the n full tone densities measured n desired raster tone densities are calculated, and that from these n desired raster tone ink densities, the arithmetic average value is calculated and this is then preset as the desired raster tone ink density for the control of all ink metering zones.
- Process according to Claim 1, characterised in that for n full tone measuring fields present in the print control strip, the arithmetic average value from the n measured full tone ink densities is calculated and that from this average value, a desired raster tone ink density is calculated which is preset as a common desired raster tone ink density for the control of all ink metering zones.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4039818A DE4039818C2 (en) | 1990-12-13 | 1990-12-13 | Process for controlling the coloring of printed products |
| DE4039818 | 1990-12-13 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0490093A1 EP0490093A1 (en) | 1992-06-17 |
| EP0490093B1 true EP0490093B1 (en) | 1994-08-31 |
Family
ID=6420240
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP91119212A Expired - Lifetime EP0490093B1 (en) | 1990-12-13 | 1991-11-12 | Method for controlling inking of printed products |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0490093B1 (en) |
| AT (1) | ATE110633T1 (en) |
| DE (2) | DE4039818C2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4229267A1 (en) * | 1992-09-02 | 1994-03-03 | Roland Man Druckmasch | Method for controlling the printing process on an autotypically operating printing machine, in particular sheet-fed offset printing machine |
| DE4401536A1 (en) * | 1994-01-20 | 1995-07-27 | Heidelberger Druckmasch Ag | Method for controlling or regulating printer |
| DE19703129B4 (en) * | 1997-01-29 | 2014-08-21 | Heidelberger Druckmaschinen Ag | Method for evaluating the quality of a printed image produced in multicolor printing on a substrate |
| WO2003033266A1 (en) † | 2001-10-15 | 2003-04-24 | Toppan Printing Co., Ltd. | Printing method, printed matter, and printing controller |
| DE102004061469A1 (en) | 2004-12-18 | 2006-07-13 | Man Roland Druckmaschinen Ag | Method for controlling the color in an offset printing machine |
| DE102018121301A1 (en) * | 2018-08-31 | 2020-03-05 | Koenig & Bauer Ag | Method for setting a layer thickness of an opaque coating material to be applied to a substrate by an application device |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DD156239A1 (en) * | 1981-01-07 | 1982-08-11 | Eva Luebbe | METHOD FOR CORRECTING DEVIATIONS FROM INSERTION AND HEATING ON OFFSET PRINTING MACHINES |
| DE3440706A1 (en) * | 1984-11-07 | 1986-05-07 | grapho metronic Meß- und Regeltechnik GmbH & Co, 8000 München | Method for the open-loop or closed-loop control of the inking of printed products |
| EP0196431B1 (en) * | 1985-03-21 | 1992-11-11 | Felix Brunner | Method, control device and auxiliary means for obtaining uniform printing results from a multicolour half-tone offset printing machine |
| JPS6328649A (en) * | 1986-07-22 | 1988-02-06 | Dainippon Screen Mfg Co Ltd | Control method of dot gain value in offset calibrator |
| DE3643721A1 (en) * | 1986-12-20 | 1988-06-30 | Heidelberger Druckmasch Ag | PRINT CONTROL STRIP |
-
1990
- 1990-12-13 DE DE4039818A patent/DE4039818C2/en not_active Expired - Fee Related
-
1991
- 1991-11-12 DE DE59102735T patent/DE59102735D1/en not_active Expired - Fee Related
- 1991-11-12 EP EP91119212A patent/EP0490093B1/en not_active Expired - Lifetime
- 1991-11-12 AT AT91119212T patent/ATE110633T1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| DE59102735D1 (en) | 1994-10-06 |
| EP0490093A1 (en) | 1992-06-17 |
| DE4039818A1 (en) | 1992-06-17 |
| DE4039818C2 (en) | 1994-09-15 |
| ATE110633T1 (en) | 1994-09-15 |
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