EP0490093A1 - Procédé de contrôle de l'encrage de produits imprimés - Google Patents

Procédé de contrôle de l'encrage de produits imprimés Download PDF

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Publication number
EP0490093A1
EP0490093A1 EP91119212A EP91119212A EP0490093A1 EP 0490093 A1 EP0490093 A1 EP 0490093A1 EP 91119212 A EP91119212 A EP 91119212A EP 91119212 A EP91119212 A EP 91119212A EP 0490093 A1 EP0490093 A1 EP 0490093A1
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EP
European Patent Office
Prior art keywords
color
tone
target
full
densities
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.)
Granted
Application number
EP91119212A
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German (de)
English (en)
Other versions
EP0490093B1 (fr
Inventor
Joachim Müller
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Manroland AG
Original Assignee
MAN Roland Druckmaschinen AG
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Filing date
Publication date
Application filed by MAN Roland Druckmaschinen AG filed Critical MAN Roland Druckmaschinen AG
Publication of EP0490093A1 publication Critical patent/EP0490093A1/fr
Application granted granted Critical
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Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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 screen tone / 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 to 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 using at least one pair of measuring fields 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 halftone measuring fields in each color metering zone.
  • 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 coverings becomes zero, then the target-actual differences of the corresponding color densities also become 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 object of the present invention is therefore 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.
  • the invention can be used in the entire area of autotypically operating printing presses, that is to say it can be used in sheet-fed and web offset printing presses, sheet-fed and web presses in gravure printing, etc.
  • FIG. 1 showing the relationship between area coverage and full tone / screen 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.
  • no target color densities - here screen color densities - are specified.
  • 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 coloring, 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 area coverage FD N1 , FD M1 is achieved in points N1, M1 with the halftone 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 N1 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 Soll 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 tone 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 color density for the other color metering zones.
  • the method according to the invention is therefore used iteratively, with new set-tone color densities being determined in each control step from the measured solid color densities and the predetermined target area coverage.
  • 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.
  • n target screen color densities using the Murray-Davies formula 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 solid 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 used only once for n 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. However, if a larger deviation is determined, then how new target screen color densities are determined from the measured solid color densities in the setup phase is regulated accordingly.

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Coloring (AREA)
EP91119212A 1990-12-13 1991-11-12 Procédé de contrôle de l'encrage de produits imprimés Expired - Lifetime EP0490093B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4039818A DE4039818C2 (de) 1990-12-13 1990-12-13 Verfahren zur Steuerung der Farbgebung von Druckerzeugnissen
DE4039818 1990-12-13

Publications (2)

Publication Number Publication Date
EP0490093A1 true EP0490093A1 (fr) 1992-06-17
EP0490093B1 EP0490093B1 (fr) 1994-08-31

Family

ID=6420240

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91119212A Expired - Lifetime EP0490093B1 (fr) 1990-12-13 1991-11-12 Procédé de contrôle de l'encrage de produits imprimés

Country Status (3)

Country Link
EP (1) EP0490093B1 (fr)
AT (1) ATE110633T1 (fr)
DE (2) DE4039818C2 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0585740A1 (fr) * 1992-09-02 1994-03-09 MAN Roland Druckmaschinen AG Méthode pour la commande du processus d'impression dans une presse d'imprimerie à cliché trame en particulier une machine à imprimer offset à feuilles
US5947029A (en) * 1997-01-29 1999-09-07 Heidelberger Druckmaschinen Aktiengesellschaft Method for assessing the quality of a multi-color print image
WO2020043463A1 (fr) * 2018-08-31 2020-03-05 Koenig & Bauer Ag Procédé permettant d'ajuster une densité de couche d'un matériau de revêtement devant être appliqué par un dispositif d'application sur un substrat de manière à le recouvrir

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4401536A1 (de) * 1994-01-20 1995-07-27 Heidelberger Druckmasch Ag Verfahren zum Steuern oder Regeln eines Betriebsvorganges an einer Druckmaschine
CA2455666C (fr) † 2001-10-15 2011-06-07 Toppan Printing Co., Ltd. Procede d'impression, matiere imprimee et controleur d'impression
DE102004061469A1 (de) 2004-12-18 2006-07-13 Man Roland Druckmaschinen Ag Verfahren zur Regelung der Farbgebung in einer Offsettdruckmaschine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3140760A1 (de) * 1981-01-07 1982-08-12 VEB Kombinat Polygraph "Werner Lamberz" Leipzig, DDR 7050 Leipzig "verfahren zur korrektur von abweichungen der einfaerbung und feuchtung an offsetdruckmaschinen"
DE3440706A1 (de) * 1984-11-07 1986-05-07 grapho metronic Meß- und Regeltechnik GmbH & Co, 8000 München Verfahren zur steuerung oder regelung der farbgebung von druckerzeugnissen
EP0255031A2 (fr) * 1986-07-22 1988-02-03 Dainippon Screen Mfg. Co., Ltd. Méthode de détermination du grossissement du point sur une épreuve
EP0196431B1 (fr) * 1985-03-21 1992-11-11 Felix Brunner Procédé, dispositif de réglage et moyens auxiliaires pour l'obtention d'un résultat d'impression uniforme au moyen d'une machine d'impression offset polychrome fonctionnant suivant le procédé de similigravure

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3643721A1 (de) * 1986-12-20 1988-06-30 Heidelberger Druckmasch Ag Druckkontrollstreifen

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3140760A1 (de) * 1981-01-07 1982-08-12 VEB Kombinat Polygraph "Werner Lamberz" Leipzig, DDR 7050 Leipzig "verfahren zur korrektur von abweichungen der einfaerbung und feuchtung an offsetdruckmaschinen"
DE3440706A1 (de) * 1984-11-07 1986-05-07 grapho metronic Meß- und Regeltechnik GmbH & Co, 8000 München Verfahren zur steuerung oder regelung der farbgebung von druckerzeugnissen
EP0196431B1 (fr) * 1985-03-21 1992-11-11 Felix Brunner Procédé, dispositif de réglage et moyens auxiliaires pour l'obtention d'un résultat d'impression uniforme au moyen d'une machine d'impression offset polychrome fonctionnant suivant le procédé de similigravure
EP0255031A2 (fr) * 1986-07-22 1988-02-03 Dainippon Screen Mfg. Co., Ltd. Méthode de détermination du grossissement du point sur une épreuve

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0585740A1 (fr) * 1992-09-02 1994-03-09 MAN Roland Druckmaschinen AG Méthode pour la commande du processus d'impression dans une presse d'imprimerie à cliché trame en particulier une machine à imprimer offset à feuilles
US5947029A (en) * 1997-01-29 1999-09-07 Heidelberger Druckmaschinen Aktiengesellschaft Method for assessing the quality of a multi-color print image
WO2020043463A1 (fr) * 2018-08-31 2020-03-05 Koenig & Bauer Ag Procédé permettant d'ajuster une densité de couche d'un matériau de revêtement devant être appliqué par un dispositif d'application sur un substrat de manière à le recouvrir
US11173702B2 (en) 2018-08-31 2021-11-16 Koenig & Bauer Ag Method for setting the layer thickness of a covering coating material to be applied to a substrate by an application device

Also Published As

Publication number Publication date
DE59102735D1 (de) 1994-10-06
ATE110633T1 (de) 1994-09-15
EP0490093B1 (fr) 1994-08-31
DE4039818C2 (de) 1994-09-15
DE4039818A1 (de) 1992-06-17

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