EP4291410A1 - Procédé de contrôle d'encre dans une presse à imprimer - Google Patents

Procédé de contrôle d'encre dans une presse à imprimer

Info

Publication number
EP4291410A1
EP4291410A1 EP22761961.6A EP22761961A EP4291410A1 EP 4291410 A1 EP4291410 A1 EP 4291410A1 EP 22761961 A EP22761961 A EP 22761961A EP 4291410 A1 EP4291410 A1 EP 4291410A1
Authority
EP
European Patent Office
Prior art keywords
printing
color
ink
optical density
control unit
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.)
Pending
Application number
EP22761961.6A
Other languages
German (de)
English (en)
Inventor
Steven Flemming
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.)
Koenig and Bauer AG
Original Assignee
Koenig and Bauer AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Koenig and Bauer AG filed Critical Koenig and Bauer AG
Publication of EP4291410A1 publication Critical patent/EP4291410A1/fr
Pending legal-status Critical Current

Links

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
    • B41F33/0027—Devices for scanning originals, printing formes or the like for determining or presetting the ink supply
    • 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 color control in a printing press according to claim 1.
  • WO 2005/092613 A2 discloses a printing machine that preferably uses multicolor printing and has at least one inking unit with a metering device, the metering device of the inking unit being controlled by a control device, the control device being connected to a preferably optical detection device, the detection device having a sensor directed onto a surface of a printing material printed in the printing press detects the quality of the print.
  • a device for densitometric measurement of printed products is known from EP 1 084 843 A1, with measurement results of a densitometer measuring head offset against specified target values being used to set commands for ink control of a printing press, with an evaluation unit downstream of the densitometer and comprising a computing unit carrying out a comparison of the color density values of a patch with the adjacent patches of the same color and type of patch (full tone or halftone).
  • DE 102004 003612 A1 discloses a method for evaluating an image of a predetermined section of a printed product, with color intensity values detected in an inline color density measurement being used to regulate ink supply in an inking unit of a printing press, with a correction of a white reference determined in a white field used for the evaluation of the color intensity values measured in other measuring fields.
  • DE 102014 011 151 A1 discloses a method for color control in printing machines using a computer by detecting color areas on a surface to be printed with a color measuring device, the surface to be printed being a printing material, the printing material being coated with opaque white, wherein the color measuring device records several color measurement values of opaque white and the computer compares the recorded color measurement values of the opaque white with one another or against a reference color value of the opaque white and stores the deviations determined during the comparison in the computer, the printing material coated with opaque white being overprinted with color measurement patches, the overprinted color measurement patches are recorded by the color measuring device and the computer for controlling the inking takes into account the influence of the stored deviations when comparing the color measurement values of the color measurement fields underlaid with opaque white with the target color values of the printing original.
  • the optical effect of a printing ink that is applied to a top color that has previously been applied to a substrate depends on the layer thickness of this top color. This dependency in the optical effect affects the color control of the printing ink that is carried out in the printing press during the printing process.
  • the invention is based on the object of creating a method for color control in a printing press which, when controlling the color of a printing ink, takes into account the dependence of its optical effect on the layer thickness of a cover color previously applied to the printing material.
  • FIG. 1 shows a layer structure of a printing ink applied to a covering color
  • the printing substrate 01 is a sheet-shaped printing substrate 01 or a web-shaped printing substrate 01, each made of any material, e.g. B. made of paper or a plastic or metal used.
  • Web-type printing material 01 is designed in particular as a film. Printing substrate 01 can also be transparent.
  • Opaque white or another opaque ink e.g. B. used in one of the shades of gold or silver.
  • Preferably Opaque paints 02 without optical brighteners are used.
  • a process color in one of the color tones cyan or magenta or yellow or black is preferably used as printing ink 03.
  • These process colors are generally in the form of a translucent printing ink 03, i.e. as a printing ink 03 that forms a translucent color layer in contrast to a covering color 02, with the respective color shade of the applied color layer only being generated by a color filter-like effect that is transparent to impinging light.
  • Printing ink 03 can also be used, e.g. B. a Pantone color or another translucent special color, ie a printing ink 03 with a color deviating from the process colors can be used.
  • Daylight colors or luminous colors or fluorescent colors or mica colors or gloss varnishes or matt varnishes or structured colors are not used as printing inks 03 in the process described here.
  • the at least one top color 02 can be printed together with the at least one printing color 03 in a number of printing units, e.g. g. in a printing press having an in-line design, or in the printing press in question in a previous printing pass that applies the at least one printing ink 03, or even in a printing press that is different from the printing press that applies the at least one printing ink 03.
  • an opaque top color 02 is printed on the printing material 01 in a first printing unit in a running printing process, and then a translucent printing ink 03 is printed on the opaque top color 02 in a second printing unit.
  • a cover color 02 is used that is lighter than the surface of the printing material 01 to be printed on and lighter than the printing ink 03 to be applied to this cover color 02. It can be provided that z. g.
  • At least two and up to four top inks 02 and/or at least two and up to ten printing inks 03 are applied to the printing substrate 01 in question, whereby each of these printing units applies a single cover ink 02 and/or a single printing ink 03 to the printing substrate 01.
  • Printing units that print according to an offset printing process are preferably used.
  • the printing press that applies the at least one translucent printing ink 03 to the surface of the printing substrate 01 has a control unit, in particular a control station of this printing press that has an operating unit and a display device being used as the control unit.
  • the color control of the printing ink 03 is carried out in connection with a z. B. control, carried out by the control unit, of at least one zone opening in each case in an inking unit belonging to the printing unit for the printing color 03 in question or in an inking unit belonging to the printing unit for the top color 02 in question.
  • Printing inks 03 on top inks 02 are preferably measured and controlled inline and online.
  • At least one actual value for the optical density of this top color 02 is preferably determined inline, ie in the printing press in question, by a first detection device.
  • the detection of the optical density of the covering color 02 can take place as required or periodically or continuously. It can be from the first detection device z.
  • a sequence of actual values for the optical density of this covering color 02 can also be recorded, with the control unit generating e.g. B. a mean value is calculated and the color control is carried out using this mean value.
  • the arranged in the printing press in question first detection device is z. B. designed as a densitometer or is at least suitable to carry out a densitometric measurement.
  • a definition range of the value for the optical density of the covering ink 02 applied to the printing substrate 01 is preferably in the range from zero to 3, with a possible number of digits after a decimal point following the nominal value is usually two.
  • a typical normal value is z. 2.00, with a maximum of e.g. B. 2.50 (very white) and a minimum e.g. B. is 0.00. The higher the nominal value for the optical density of the top color 02, the lighter or whiter it appears, particularly in relation to the surface of the substrate 01 to be printed.
  • a layer thickness of the top color 02 to be applied to the printing substrate 01 in question in the further course of the printing process is determined on the printing unit in question by a control unit that records the at least one actual value for the optical density of this top color 02 as a function of a previously determined value for the optical density of the
  • the surface of the unprinted printing material 01 is set in such a way that the at least one actual value for the optical density of this cover color 02 recorded by the first detection device, taking into account a tolerance range specified for this cover color 02 in the control unit, corresponds to a target value set on this control unit for this cover color 02. value.
  • At least one actual value for the optical density of this printing ink 03 is preferably determined inline, ie in the printing press in question, by a second detection device.
  • the optical density of the printing ink 03 can be recorded as required, periodically or continuously. It can be from the second detection device z.
  • a sequence of actual values for the optical density of this printing ink 03 can also be recorded, with the control unit generating e.g. B. a mean value is calculated and the color control is carried out using this mean value.
  • the arranged in the printing press in question second detection device is z. B. designed as a densitometer or is at least suitable to carry out a densitometric measurement.
  • a definition range of the value for the optical density of the printing ink 03 applied to the covering ink 02 is preferably in the range from zero to 3, with a possible number of digits after a decimal point following the nominal value generally being two.
  • a typical normal value is z. B. 1.50, with a maximum z. B. 2.50 (very dark) and a minimum z. B. is 0.00.
  • a layer thickness of this printing ink 03 to be applied to the top ink 02 in the further course of the printing process is determined on the printing unit printing this printing ink 03 by the control unit, which also records the at least one actual value for the optical density of this printing ink 03, depending on the previously applied to the printing substrate 01 applied layer thickness of the top color 02 or as a function of the actual value for the optical density of the top color 02 such that the at least one actual value for the optical density of this printing ink 03 detected by the second detection device, taking into account a value for this printing ink 03 in the Control unit defined tolerance range corresponds to a target value set on the control unit for this printing ink 03.
  • the dependency of the layer thickness of printing ink 03 to be applied on top ink 02 on the layer thickness of top ink 02 previously applied to printing substrate 01 or the dependency of the layer thickness of printing ink 03 to be applied on top ink 02 on the actual value for the optical density of top ink 02 exists in each case in particular in a ratio previously defined in the control unit of the target value for the layer thickness of printing ink 03 to be applied to the actual value of the layer thickness of top color 02 or in a specified ratio of the target value for the optical density of printing ink 03 to the actual value of the optical density of the previously applied top coat 02.
  • This determination can be made e.g. B.
  • the tolerance range specified in the control unit for the target value of the optical density of the respective cover color 02 or the respective printing ink 03 is preferably specified for each printing unit and for all orders.
  • Order-related Lab values, but no optical densities, are made available to the control unit.
  • the control unit converts the order-related Lab values into values for optical densities.
  • This procedure is carried out on the control unit, e.g. B. activated in that the printing material 01 to be printed in an upcoming printing process is selected from a quantity of printing materials 01 stored in the control unit.
  • the printing press in question is a printing press with a turning device for the printing material 01
  • this method is carried out on the control unit, e.g. B. activated in that for the two sides of the printing material 01 to be printed in the forthcoming printing process, the respective printing material 01 is individually selected from a set of printing materials 01 stored in the control unit.
  • the color control of the respective top color 02 or the respective printing ink 03 can be done e.g. B. using a color measuring strip printed on the printing substrate 01.
  • Fig. 2 shows a highly simplified schematic representation of a color control z. B. in a printing press having several printing units, e.g. B. in a printing press that prints on a printing substrate 01 in the form of a material web, ie a web-fed printing press.
  • the printing substrate 01 is printed in its transport direction T by this printing press in a first printing unit 06 with an opaque top ink 02 and then in a second printing unit 07 with a translucent printing ink 03.
  • the printing units 06; 07 are e.g. B. each formed as an offset printing unit.
  • a first detection device 08 e.g. B.
  • the first detection device 08 sends the at least one value it has detected for an optical density of the covering ink 02 applied to the printing substrate 01 to a control unit 11.
  • the second detection device 09 also sends the at least one value it has detected for an optical density of the printing substrate 01 applied printing ink 03 to the control unit 11.
  • the control unit 11 is equipped with an operating unit 12 and a display device 13. Order-related Lab values are also made available to the control unit 11, which the control unit converts into values for optical densities.
  • the control unit 11 is preferably a control station of this printing press.
  • the control unit 11 controls the first printing unit 06 and the second printing unit 07 in such a way that the previously described method for color control in a printing press is carried out.
  • the directional arrows in FIG. 2 indicate the signal direction primarily required for carrying out the color control.

Landscapes

  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Spectrometry And Color Measurement (AREA)

Abstract

L'invention concerne un procédé de contrôle d'encre dans une presse à imprimer où : dans un processus d'impression en cours, une encre de couverture opaque (02) est imprimée sur un substrat d'impression (01) dans une première unité d'impression (06) puis une encre d'impression transparente (03) est imprimée sur l'encre de couverture (02) dans une seconde unité d'impression (07) ; pour l'encre de couverture (02) imprimée sur le substrat d'impression (01), au moins une valeur réelle de la densité optique de ladite encre de couverture (02) est déterminée par un premier dispositif de détection (08) ; pour ladite encre de couverture (02), une épaisseur de couche de celle-ci à appliquer sur le substrat d'impression (01) est définie au niveau de l'unité d'impression (06) en question par une unité de commande (11), qui acquiert ladite valeur réelle de densité optique de ladite encre de couverture (02), conformément à une valeur déterminée préalablement de la densité optique sur la surface du substrat d'impression non imprimé (01) de telle sorte que ladite valeur réelle de densité optique de ladite encre de couverture (2) détectée par le premier dispositif de détection (08) correspond, compte tenu d'une plage de tolérance définie pour ladite encre de couverture (02) dans l'unité de commande (11), à une valeur cible définie pour ladite encre de couverture (02) dans l'unité de commande (11) ; pour l'encre d'impression (03) imprimée sur l'encre de couverture précédemment imprimée (02), au moins une valeur réelle de la densité optique de ladite encre d'impression (03) est déterminée par un second dispositif de détection (09) ; pour ladite encre d'impression (03), une épaisseur de couche de celle-ci à appliquer à l'encre de couverture (02) est définie au niveau de l'unité d'impression (07) qui imprime ladite encre d'impression (03) par l'unité de commande (11), qui acquiert également ladite valeur réelle de la densité optique de ladite encre d'impression (03), conformément à l'épaisseur de couche de l'encre d'impression (02) appliquée précédemment au substrat d'impression (01) ou conformément à la valeur actuelle de la densité optique de ladite encre de couverture (02) de telle sorte que ladite valeur actuelle de la densité optique de ladite encre d'impression (03) détectée par le second dispositif de détection (09) correspond, compte tenu d'une plage de tolérance définie pour ladite encre d'impression (03) dans l'unité de commande (11), à une valeur cible définie pour ladite encre d'impression (03) au niveau de l'unité de commande (11).
EP22761961.6A 2021-08-11 2022-08-02 Procédé de contrôle d'encre dans une presse à imprimer Pending EP4291410A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102021120841.6A DE102021120841A1 (de) 2021-08-11 2021-08-11 Verfahren zur Farbregelung in einer Druckmaschine
PCT/EP2022/071675 WO2023016861A1 (fr) 2021-08-11 2022-08-02 Procédé de contrôle d'encre dans une presse à imprimer

Publications (1)

Publication Number Publication Date
EP4291410A1 true EP4291410A1 (fr) 2023-12-20

Family

ID=83151435

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22761961.6A Pending EP4291410A1 (fr) 2021-08-11 2022-08-02 Procédé de contrôle d'encre dans une presse à imprimer

Country Status (6)

Country Link
US (1) US11932004B1 (fr)
EP (1) EP4291410A1 (fr)
JP (1) JP2024513528A (fr)
CN (1) CN117203059A (fr)
DE (1) DE102021120841A1 (fr)
WO (1) WO2023016861A1 (fr)

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5333549A (en) * 1992-09-14 1994-08-02 Playoff Corporation Method for producing printed images on foil-covered surfaces
DE10013876B4 (de) * 1999-04-08 2013-10-02 Heidelberger Druckmaschinen Ag Verfahren zum Regeln der Farbgebung beim Drucken mit einer Druckmaschine
DE29916379U1 (de) 1999-09-17 1999-12-09 Roland Man Druckmasch Vorrichtung zum densitometrischen Ausmessen von Druckprodukten
DE102004003612B4 (de) 2004-01-25 2015-01-08 grapho metronic Meß- und Regeltechnik GmbH Verfahren und Auswertung eines Bildes von einem vorbestimmten Ausschnitt eines Druckerzeugnisses
EP1579992B1 (fr) 2004-03-23 2012-06-06 Koenig & Bauer Aktiengesellschaft Machine d'impression avec au moins un encrier
DE102005012913A1 (de) * 2004-03-23 2005-10-13 Koenig & Bauer Ag Druckmaschinen mit mindestens einem mit einem Stellglied einstellbaren Maschinenelement
DE102008041430B4 (de) * 2008-08-21 2011-12-08 Koenig & Bauer Aktiengesellschaft Verfahren zur Prüfung zumindest eines in einem laufenden Druckprozess einer Druckmaschine ermittelten Messwertes auf seine Plausibilität
DE102008041426B4 (de) * 2008-08-21 2014-09-04 Koenig & Bauer Aktiengesellschaft Verfahren zur Verwendung in einer Druckmaschine mit mindestens einem Farbwerk
DE102014011151A1 (de) 2013-08-23 2015-02-26 Heidelberger Druckmaschinen Ag Mehrstufiges Regeln und Messen von Deckweiß
WO2015069513A1 (fr) * 2013-11-08 2015-05-14 Sun Chemical Corporation Encre hydrochromique durcissable sous l'effet d'une énergie
US9376582B1 (en) * 2015-07-30 2016-06-28 Eastman Kodak Company Printing on water-impermeable substrates with water-based inks
DE102016207398B3 (de) * 2015-09-09 2016-08-18 Koenig & Bauer Ag Maschinenanordnung zum sequentiellen Bearbeiten mehrerer bogenförmiger jeweils eine Vorderseite und eine Rückseite aufweisender Substrate
JP2018008394A (ja) * 2016-07-12 2018-01-18 凸版印刷株式会社 見当マークの検知装置、見当自動制御装置および輪転印刷機の印刷機ユニット
DE102018121299B4 (de) * 2018-08-31 2023-08-24 Koenig & Bauer Ag Verfahren zum Einstellen einer Schichtdicke eines von einer Auftrageinrichtung auf ein Substrat aufzutragenden deckenden Beschichtungsstoffes
GB201815779D0 (en) * 2018-09-27 2018-11-14 De La Rue Int Ltd Documents and methods of manufacture thereof
US20220161546A1 (en) * 2019-08-09 2022-05-26 Squee-Geez Inc. Screen Printing Method

Also Published As

Publication number Publication date
CN117203059A (zh) 2023-12-08
US20240083163A1 (en) 2024-03-14
JP2024513528A (ja) 2024-03-25
DE102021120841A1 (de) 2023-02-16
US11932004B1 (en) 2024-03-19
WO2023016861A1 (fr) 2023-02-16

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