EP2253472B1 - Procédé de transport de couleur dans un mécanisme d'encrage d'une imprimante offset - Google Patents

Procédé de transport de couleur dans un mécanisme d'encrage d'une imprimante offset Download PDF

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Publication number
EP2253472B1
EP2253472B1 EP10160297A EP10160297A EP2253472B1 EP 2253472 B1 EP2253472 B1 EP 2253472B1 EP 10160297 A EP10160297 A EP 10160297A EP 10160297 A EP10160297 A EP 10160297A EP 2253472 B1 EP2253472 B1 EP 2253472B1
Authority
EP
European Patent Office
Prior art keywords
ink
fact
zone
dampening fluid
feeding
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.)
Active
Application number
EP10160297A
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German (de)
English (en)
Other versions
EP2253472A1 (fr
Inventor
Nikolaus Pfeiffer
Axel Dr. Hauck
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.)
Heidelberger Druckmaschinen AG
Original Assignee
Heidelberger Druckmaschinen AG
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Publication date
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Publication of EP2253472A1 publication Critical patent/EP2253472A1/fr
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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
    • B41F33/0027—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
    • B41F31/00—Inking arrangements or devices
    • B41F31/02—Ducts, containers, supply or metering devices
    • B41F31/04—Ducts, containers, supply or metering devices with duct-blades or like metering devices
    • B41F31/045—Remote control of the duct keys
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/0054—Devices for controlling dampening
    • 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
    • B41P2233/11—Pre-inking
    • 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
    • B41P2233/12—Pre-wetting

Definitions

  • the invention relates to a method for feeding ink into an inking unit of an offset printing unit, in which ink is applied by means of a plurality of transversely to the printing direction in zones arranged independently adjustable Farbdosierierin on an inking roller of the inking unit and each of the Farbdosieriana depending on the ink requirements in the Farbdosierelement assigned zone be preset.
  • offset printing units In order to enable a flexible ink supply as a function of the coloration of a print job to be printed, offset printing units usually have a plurality of arranged independently of one another in the printing direction in color independently adjustable Farbdosierieri, while dampening solution is metered integrally into the offset printing unit.
  • the Farbdosierieri be set according to the anticipated color requirements for the print job.
  • the area coverage in areas corresponding to the zones of the offset printing unit is calculated from the print job data and transferred to the control of the offset printing unit (see for example WO 89007525 ).
  • the preset for the color dosing elements is calculated.
  • the characteristic curve of said relationship can be calculated directly from the actual settings of the ink dosing elements in the area covers to be printed, so that the characteristic can be dynamically updated (learned).
  • the amount of dampening solution introduced integrally into the offset printing unit is determined by the zone in which the largest ink requirement and thus the maximum dampening solution requirement are required. This means that the zone with the largest amount of ink or the highest surface coverage determines the level of dampening solution in the offset printing unit.
  • the printed color density decreases.
  • a print article which is inhomogeneous with respect to the coloration in the printing direction, in particular a printing form with different areal coverings in the zones perpendicular to the printing direction, consequently, in a negative consequence, low areal coverage areas are under-dyed. If a color presetting characteristic has been learned on the basis of an uneven printing form, areas of low area coverage may also be over-dyed in uniform printing forms.
  • the object of the present invention is to enable the supply of ink to an inking unit of an offset printing unit in an amount or at a rate which has a slight deviation from the correct amount or rate for the inking of the print job.
  • ink is applied to an inking roller of the inking unit by means of a plurality of ink dosing elements arranged in zones which are arranged in zones at right angles to each other in the lateral direction.
  • Each of the color metering elements is preset as a function of the ink requirement in the zone assigned to the ink metering element.
  • the value of the presetting for the color metering elements is in each case determined in such a way that, in addition, the deviation of the coloration caused by an excess of dampening solution quantity is reduced from an expected value in the zone assigned to the color metering element.
  • the moisture management is taken into account in the color presetting. If the moisture supply is non-uniform relative to the ink demand in the individual zones, an excess supply of moisture at low area coverage, in conjunction with the fact that the amount of dampening solution required depends on the printed area, will cause a change in density.
  • the effect is counteracted: With the relationships used in accordance with the invention, this effect can be taken into account in the color pre-setting, in particular reduced, preferably compensated.
  • a presetting of the ink metering elements is made as a function of the ink preset characteristic, the local area coverage and the moisture influence, which depends on both the local and the maximum area coverage in the zones.
  • a correction of the settings based on the characteristic curve in the color zones can be made, which is based on a calculated density deviation by a homogeneous dampening.
  • the influence of the area coverage distribution of the subject by the moisture on the coloration in a certain zone can be described and taken into account in the color pre-setting.
  • a Farbdosierelement may be in particular a color meter, a paint slide, a cartridge, a Dosierexzenter or a metering cylinder.
  • the area coverage of the zone is preferably determined.
  • the offset printing unit can have an integral dampening unit and dampening solution can be fed to the offset printing unit independently of the zone.
  • a correction value for the value of the presetting can be determined for the color metering element in a zone from the dampening solution excess relative to a dampening solution working quantity for the zone as a function of the expected color requirement of the ink metering element.
  • the correction value can be taken from a table or determined by calculation using a formula.
  • the dampening solution working quantity can be a dampening solution quantity assigned to the color requirement in the zone, in particular the optimum quantity of dampening solution for this color requirement.
  • the relationship between the dampening solution quantity and the relative density from the relative dampening solution excess which is present in the form of a table or an equation, can be used to calculate the relative density deviation, so that the relative correction of the setting of the ink metering element can be determined.
  • the area coverage of the zone can be corrected from the dampening solution excess relative to a dampening solution working quantity.
  • the dampening solution operating quantity of the offset printing unit can be set as a function of the maximum of the values of the ink requirement in the individual zones.
  • an integral or zone-independent dampening solution adjustment can be made to the value in the zone with the maximum color requirement, in particular the optimum value for the maximum color requirement.
  • a characteristic curve for determining the opening size of the ink metering element as a function of the area coverage is used.
  • the effect of the dampening solution amount is also considered according to the invention when learning the relationship between the area coverage and the Farbdosierianaingna.
  • a further characteristic curve can be learned or dynamically updated from the corrected value for the presetting of the ink metering element.
  • the learning of a relationship of the opening size of the color metering element as a function of the area coverage is based in particular on the corrected area coverage.
  • the learning of the relationship of the opening size of the ink metering element as a function of the area coverage can be based on a setting of the ink metering elements obtained by inverting the correction function.
  • the printing machine in which the method according to the invention is used can be a direct or indirect planographic printing machine, in particular an offset printing press.
  • the printing press may in particular be a sheet-processing machine.
  • the printing machine is a sheet-processing offset printing machine.
  • paper, paperboard, cardboard or organic polymer film can be processed as printing materials.
  • the printing press may comprise one feeder, a plurality of printing units, in particular four, six, eight, ten or twelve offset printing units, and a delivery arm.
  • the printing press can also have other aggregates, such as a stamping or a coating unit, have.
  • a printing machine with a control computer and at least one offset printing unit comprises a computer program product running on the control computer which can be loaded directly into the internal memory of the control computer of the printing press and / / or is stored on a medium of the control computer and comprises software code sections with which all the steps of a method with features or feature combinations of this representation are executed.
  • the FIG. 1 shows a flow chart for explaining the procedure for determining the profile of the moisture transverse to the printing direction (transverse profile). To account for moisture differences across the direction of pressure, these must be determined. In a preferred procedure, this determination can be carried out as follows. In the upper part of the flowchart in the FIG. 1 is stated that in a first step is printed without moisture. A distribution of the density transversely to the printing direction (density profile) of a homogeneous printing plate with a homogeneous ink zone setting is determined by measurement. Underneath is in the flow chart the FIG. 1 shown that in a second step, a pressure with moisture takes place, wherein a homogeneous printing plate with homogeneous ink zone adjustment is used.
  • a density profile is determined by measurement. In this way the relative density deviations can be calculated.
  • a correction of the moisture profile ("wet") density profile by the moisture-free (“dry") density profile is carried out.
  • the distribution of the relative dampening solution excess in the zones is calculated in a fourth step, so that the cross profile of the moisture difference is determined (see the lower part of the flow chart in FIG. 1 ).
  • the color zones can be regulated to constant densities after the described first step, so that the third step can be dispensed with.
  • the relationship between the color density and the moisture is determined.
  • the relationship between the area coverage and the required amount of fountain solution is determined.
  • the relative over-humidification is calculated.
  • the resulting under-coloring is calculated.
  • a counterbalancing of the under-coloring takes place by an adjustment of the adjustment of the color-metering elements in the zones.
  • FIG. 2 is a flowchart for explaining an embodiment of the color preset calculation according to the present invention.
  • FIG. From the preliminary data, the area coverage in the individual zones is available. With the aid of the functional relationship between the area coverage and the ink zone setting (default setting line), uncorrected settings of the ink dosing elements in the individual ink zones are determined. According to the invention, the precursor data are also used for the calculation of the dampening solution excess. According to the invention, the relationship between the areal coverage and the required dampening solution quantity (see below also on the FIG. 5 referencing description part), so that the fountain solution excess is calculated with the aid of the area coverings present for the specific print job and the concrete cross profile.
  • the relative correction of the adjustment of the ink metering elements in the zones is calculated.
  • the corrected color zone adjustment according to the invention is obtained, which takes into account the moisture.
  • the procedure is summarized as follows: The relationship between the color density and the moisture is determined. The relationship between the area coverage and the required amount of fountain solution is determined. The relative over-humidification is calculated. The resulting under-coloring is calculated. The color zone settings are corrected. A new characteristic curve is determined with the corrected color zone settings and the area coverage. This new characteristic can replace an old characteristic curve for subsequent print jobs (learn process of the controller). Alternatively, the characteristic curve can also be calculated from the current color zone settings and the effective area coverage.
  • the FIG. 3 is a flowchart for explaining the procedure for learning the color preset in a development of the method according to the invention.
  • the relationship of the area coverage and the required amount of fountain solution is determined, so that with the help of the existing for the specific print job area coverage and the concrete cross-profile of dampening solution surplus is calculated.
  • the relative correction of the adjustment of the color metering elements in the zones is calculated.
  • the humidity-taking corrected color-zone adjustment also serves to correct a present preset characteristic to a new one Preset characteristic by setting the area coverage in connection with the corrected color zone settings obtained according to the invention.
  • FIG. 4 graphically illustrates exemplary relationships of the relative density D as a function of the humidity F.
  • the relative density decreases with increasing humidity.
  • the quantitative course of this decrease is among other things machine-dependent.
  • the relationship between density D and moisture F required for carrying out the method according to the invention can be determined, for example, in the following manner.
  • a test mold is printed at the lubrication limit.
  • the adjustment of the ink metering elements takes place in such a way that the ink density is constant over the sheet.
  • This density DV is considered to be the reference density DV_ref.
  • the humidity is increased by means of a setting device.
  • the density DV is measured on the printed sheet as a function of the moisture, specifically the quantitative value of the humidity setting device.
  • reference of the measured densities DV (humidity) is made to the reference density DV_ref.
  • the quotient of both values is the relative density at a given moisture value.
  • the consideration can also be made in individual zones with averaging of the individual values.
  • FIG. 5 is a graphical representation of an exemplary relationship of the humidity F at the lubrication limit in function of the area coverage FD shown.
  • the moisture increases with increasing area coverage. The quantitative course of this increase is among other things machine-dependent.
  • the relationship between moisture F at the smear limit and area coverage FD required for carrying out the method according to the invention can be determined, for example, in the following manner. It will be a test form with a given area coverage printed. The control of the ink zone settings is made such that the density at the arc corresponds to a reference value. The lubrication limit is determined: It is determined how much moisture is necessary to avoid greasing. This procedure is repeated for a plurality of different area coverages.
  • test printing plate having different surface coverages and to determine the local lubrication limit, that is to say the lubricating limit is determined separately for each individual areal coverage area.
  • the relative humidity difference is in the order of 10 to 15%. This results in density differences of about 0.1 to 0.2 density units. To compensate, the settings in the color zones of the same order of magnitude, by 10 to 20%, must be corrected.

Landscapes

  • Inking, Control Or Cleaning Of Printing Machines (AREA)

Claims (14)

  1. Procédé pour le transport d'encre dans un groupe encreur d'un groupe d'impression Offset, dans lequel l'encre d'impression est appliquée sur un rouleau encreur au moyen d'une pluralité d'éléments de dosage d'encre disposés transversalement à la direction d'impression dans des zones réglables indépendamment les unes des autres et chacun des éléments de dosage d'encre étant préréglé en fonction du besoin d'encre dans la zone associée à l'élément de dosage d'encre,
    caractérisé en ce que
    la valeur du préréglage pour les éléments de dosage d'encre est définie respectivement de sorte qu'en supplément, la divergence de l'encrage provoquée par une quantité d'agent mouillant trop importante par rapport à une valeur attendue dans la zone associée à l'élément de dosage d'encre est réduite.
  2. Procédé pour le transport d'encre selon la revendication 1, caractérisé en ce que la couverture de surface de la zone est définie en tant que mesure pour le besoin d'encre.
  3. Procédé pour le transport d'encre selon la revendication 1 ou 2, caractérisé en ce que le groupe d'impression offset présente un groupe de mouillage intégral et des agents mouillants sont amenés au groupe d'impression Offset indépendamment des zones.
  4. Procédé pour le transport d'encre selon l'une des revendications précédentes caractérisé en ce que pour l'élément de dosage d'encre dans une zone, il est déterminé à partir de l'excédent d'agent mouillant par rapport à une quantité de travail d'agent mouillant pour la zone, une valeur correctrice pour la valeur du préréglage en fonction du besoin d'encre à attendre de l'élément de dosage d'encre.
  5. Procédé pour le transport d'encre selon la revendication 3, caractérisé en ce que la couverture de surface de la zone est corrigée à partir de l'excédent d'agent mouillant par rapport à une quantité de travail d'agent mouillant.
  6. Procédé pour le transport d'encre selon la revendication 4, caractérisé en ce que la valeur correctrice est déduite d'un tableau ou est définie par calcul à l'aide d'une formule.
  7. Procédé pour le transport d'encre selon la revendication 4, 5 ou 6, caractérisé en ce que la quantité de travail d'agent mouillant est une quantité d'agent mouillant associée au besoin d'encre dans la zone.
  8. Procédé pour le transport d'encre selon l'une des revendications 4 à 7, caractérisé en ce que par le rapport existant sous forme d'un tableau ou d'une équation entre la quantité d'agent mouillant et la densité relative à partir de l'excédent relatif d'agent mouillant, on calcule la divergence relative de densité de sorte que la correction relative du réglage de l'élément de dosage d'encre peut être définie.
  9. Procédé pour le transport d'encre selon la revendication 3, caractérisé en ce que la quantité de service d'agent mouillant du groupe d'impression offset est réglée en fonction du maximum des valeurs du besoin d'encre dans chacune des zones.
  10. Procédé pour le transport d'encre selon l'une des revendications 2 à 9, caractérisé en ce que pour le préréglage des éléments de dosage d'encre en fonction de la consommation d'encre, il est utilisé une caractéristique pour la détermination de la grandeur d'ouverture de l'élément de dosage d'encre en fonction de la couverture de surface.
  11. Procédé pour le transport d'encre selon la revendication 10, caractérisé en ce qu'à partir de la valeur corrigée pour le préréglage de l'élément de dosage d'encre, il est déduit une autre caractéristique à partir de la valeur corrigée pour le préréglage de l'élément de dosage d'encre.
  12. Procédé pour le transport d'encre selon la revendication 10 ou 11, caractérisé en ce que l'apprentissage d'un rapport de la dimension d'ouverture de l'élément de dosage d'encre est basée en fonction de la couverture de surface sur les couvertures corrigés de surface.
  13. Procédé pour le transport d'encre selon la revendication 10, 11, ou 12, caractérisé en ce que l'apprentissage d'un rapport de la dimension d'ouverture de l'élément de dosage d'encre est basée en fonction de la couverture de surface sur des réglages des éléments de dosage d'encre, réglages qui sont déduits de l'inversion de la fonction de correction.
  14. Machine d'impression avec un ordinateur de commande et au moins un groupe d'impression Offset, caractérisée par un produit de programme informatique fonctionnant sur un ordinateur de commande, produit qui peut être chargé directement dans la mémoire interne de l'ordinateur de commande de la machine d'impression et/ou est stocké sur un support de l'ordinateur de commande et qui comprend des sections de code de logiciel avec lesquelles toutes les étapes d'un procédé sont exécutées selon l'une des revendications précédentes.
EP10160297A 2009-05-18 2010-04-19 Procédé de transport de couleur dans un mécanisme d'encrage d'une imprimante offset Active EP2253472B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102009021889A DE102009021889A1 (de) 2009-05-18 2009-05-18 Verfahren zum Zuführen von Farbe in ein Farbwerk eines Offsetdruckwerks

Publications (2)

Publication Number Publication Date
EP2253472A1 EP2253472A1 (fr) 2010-11-24
EP2253472B1 true EP2253472B1 (fr) 2012-02-01

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EP10160297A Active EP2253472B1 (fr) 2009-05-18 2010-04-19 Procédé de transport de couleur dans un mécanisme d'encrage d'une imprimante offset

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EP (1) EP2253472B1 (fr)
AT (1) ATE543650T1 (fr)
DE (1) DE102009021889A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010034350A1 (de) * 2010-08-14 2012-02-16 Manroland Ag Einrichtung zur Regelung des Feuchtmittelauftrags und Farbauftrags in einer Druckmaschine
DE102013113281A1 (de) 2013-01-16 2014-07-31 manroland sheetfed GmbH Verfahren zur automatischen Farbvoreinstellung
CN112622432A (zh) * 2019-09-24 2021-04-09 海德堡印刷机械股份公司 用于控制粉末设备的方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3804941A1 (de) 1988-02-17 1989-08-31 Hell Rudolf Dr Ing Gmbh Verfahren und einrichtung zur erfassung von druckflaechendeckungsdaten
DE10028713B4 (de) 2000-06-08 2010-11-25 Art+Com Ag Visualisierungsvorrichtung und -verfahren
DE10058550A1 (de) * 2000-11-24 2002-05-29 Heidelberger Druckmasch Ag Verfahren zur Regelung des Farb-zu-Feuchtmittelgleichgewichts in einer Rotations-Offsetdruckmaschine
DE10312998B4 (de) * 2002-04-03 2015-07-09 Heidelberger Druckmaschinen Ag Lernende Farbführung
DE102004011239C5 (de) 2004-03-09 2023-07-27 manroland sheetfed GmbH Verfahren zur automatischen Farbvoreinstellung an mindestens einem Farbwerk einer Druckmaschine

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ATE543650T1 (de) 2012-02-15
EP2253472A1 (fr) 2010-11-24
DE102009021889A1 (de) 2010-11-25

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