EP3318410B1 - Method for operating a multi-colour ink printing machine - Google Patents

Method for operating a multi-colour ink printing machine Download PDF

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Publication number
EP3318410B1
EP3318410B1 EP17196772.2A EP17196772A EP3318410B1 EP 3318410 B1 EP3318410 B1 EP 3318410B1 EP 17196772 A EP17196772 A EP 17196772A EP 3318410 B1 EP3318410 B1 EP 3318410B1
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EP
European Patent Office
Prior art keywords
printing
print
image
printed
ink
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Active
Application number
EP17196772.2A
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German (de)
French (fr)
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EP3318410A1 (en
Inventor
Peter Dr. Hachmann
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
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Heidelberger Druckmaschinen AG
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Publication of EP3318410A1 publication Critical patent/EP3318410A1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/485—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by the process of building-up characters or image elements applicable to two or more kinds of printing or marking processes
    • B41J2/505—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by the process of building-up characters or image elements applicable to two or more kinds of printing or marking processes from an assembly of identical printing elements
    • B41J2/515—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by the process of building-up characters or image elements applicable to two or more kinds of printing or marking processes from an assembly of identical printing elements line printer type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/07—Ink jet characterised by jet control
    • B41J2/11—Ink jet characterised by jet control for ink spray
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/17—Ink jet characterised by ink handling
    • B41J2/175—Ink supply systems ; Circuit parts therefor
    • B41J2/17503—Ink cartridges
    • B41J2/17506—Refilling of the cartridge
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/17—Ink jet characterised by ink handling
    • B41J2/175—Ink supply systems ; Circuit parts therefor
    • B41J2/17503—Ink cartridges
    • B41J2/17506—Refilling of the cartridge
    • B41J2/17509—Whilst mounted in the printer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/21—Ink jet for multi-colour printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/485—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by the process of building-up characters or image elements applicable to two or more kinds of printing or marking processes
    • B41J2/505—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by the process of building-up characters or image elements applicable to two or more kinds of printing or marking processes from an assembly of identical printing elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/485—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by the process of building-up characters or image elements applicable to two or more kinds of printing or marking processes
    • B41J2/505—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by the process of building-up characters or image elements applicable to two or more kinds of printing or marking processes from an assembly of identical printing elements
    • B41J2/5056—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by the process of building-up characters or image elements applicable to two or more kinds of printing or marking processes from an assembly of identical printing elements using dot arrays providing selective dot disposition modes, e.g. different dot densities for high speed and high-quality printing, array line selections for multi-pass printing, or dot shifts for character inclination
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/485—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by the process of building-up characters or image elements applicable to two or more kinds of printing or marking processes
    • B41J2/505—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by the process of building-up characters or image elements applicable to two or more kinds of printing or marking processes from an assembly of identical printing elements
    • B41J2/51—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by the process of building-up characters or image elements applicable to two or more kinds of printing or marking processes from an assembly of identical printing elements serial printer type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
    • B41J29/38—Drives, motors, controls or automatic cut-off devices for the entire printing mechanism
    • B41J29/393—Devices for controlling or analysing the entire machine ; Controlling or analysing mechanical parameters involving printing of test patterns
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/21—Ink jet for multi-colour printing
    • B41J2/2132—Print quality control characterised by dot disposition, e.g. for reducing white stripes or banding
    • B41J2/2146—Print quality control characterised by dot disposition, e.g. for reducing white stripes or banding for line print heads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2202/00—Embodiments of or processes related to ink-jet or thermal heads
    • B41J2202/01—Embodiments of or processes related to ink-jet heads
    • B41J2202/21—Line printing

Definitions

  • the present invention relates to a method for operating a multicolor ink printing machine with the features of claim 1.
  • the invention is in the technical field of the graphics industry and there in particular in the field of ink printing.
  • a print image is generated on a printing material by a print head producing the finest ink drops corresponding to the image to be printed and transferring these onto the printing material without contact.
  • the printing material can consist of paper, cardboard or plastic and can be arched or web-shaped.
  • An ink printing machine for industrial production known under the product name "Primefire” and designed by Heidelberger Druckmaschinen AG, prints paper sheets with water-based inkjet inks.
  • the machine comprises seven consecutive printing stations, which transfer the colors CMYK (cyan, magenta, yellow and black) and OGV (orange, green, violet) to the paper with fixed print heads.
  • CMYK cyan, magenta, yellow and black
  • OGV range, green, violet
  • the EP 373 957 A1 in contrast, describes a printing press with moving print heads. Industrial production speeds are generally not achieved due to the head being moved back and forth. However, the document discloses a way to at least increase the production speed. Instead of printing with the four colors CMYK, it is also possible to print only with black, i.e. in the KKKK configuration. The production speed can be quadrupled.
  • Another object of the present invention is to provide a method which is improved over the prior art and which enables high-quality printed products, i.e. To produce print products with high resolution at least in the colored part of the print image at high print speed. Another object is to create a method which enables a printing press to be used variably, i.e. depending on the print job in a suitable color configuration.
  • the EP1826005A1 discloses an ink jet recording apparatus equipped with a recording head for ejecting one or more types of inks containing a photo-curable component onto a recording medium, and a light irradiation device for curing the ink by emitting light onto the deposited ink ..
  • the DE3932462A1 discloses a multi-color inkjet printer. This has a printhead that is selectively connected to an ink reservoir, each of which has a different color ink. An additional reservoir contains a cleaning liquid. The printhead receives ink from the reservoirs through a single supply tube. Each container is connected to the hose via a control valve. A central control unit generates signals to operate the valves and to supply the selected color ink.
  • the US2011 / 227973A1 discloses a modular printing device that can be configured with a different number of ink colors and types and with a different print resolution across the process direction for each ink color and type.
  • the modular printing device which can be configured to print with multiple combinations of ink colors and types of ink at different print resolutions, includes a variety of printhead assemblies, each printhead assembly configured to receive ink with a first print resolution on an image recording surface. And each ink supply is configured to store ink and deliver ink to a printhead assembly in the plurality of printhead assemblies. And with a controller configured to operate the plurality of printhead assemblies in one of at least two combinations of.
  • the colored portion of the printed image is composed of partial images. Both drawing files together result in the desired print resolution.
  • the black component on the other hand, is only printed with half the desired print resolution if only one printing station is intended for black.
  • a preferred development of the method according to the invention can be characterized in that the colored part of the printed image in the transport direction is built up from successive print lines and that the first partial picture comprises all even-numbered lines of the colored part of the printed image and the second partial picture comprises all odd-numbered lines of the colored part of the printed image .
  • "Even numbered" and "odd numbered” only stand for alternating lines.
  • the construction of the print image from complementary partial images using at least two print heads advantageously enables the production speed to be increased and at most doubled.
  • a preferred development of the method according to the invention can be characterized in that the colored portion of the printed image is constructed in a checkerboard manner and that the first partial image comprises a first checkered half of the colored portion of the printed image and the second partial image comprises a second checkered half of the colored portion of the printed image that is complementary to the first half .
  • the printing speed can also be doubled in this way too.
  • Checkerboard-like printing advantageously leads to a "quieter" print image.
  • the second group O G V can simulate the first group C M Y, i.e. C, M and Y are then mixed from the chromatic colors O, G and V.
  • the print data are prepared accordingly in prepress.
  • the checkerboard-like printing of two complementary partial images from CMY and OG V is preferred.
  • a printing press in the KCMYOGV configuration therefore offers the advantage that the OGV group can either be used to expand the color space (in the production of seven-color printed products) or to double the Print speed (when producing only four-color print products with seven active printing stations).
  • the groups C, M and Y can be simulated by the Y, G and V. Since yellow, as one of the brightest colors in the additive color mixture, can only be mixed from other colors with difficulty, the configuration CCMYYGV is preferred over the configuration CCMYOGV.
  • the first group F1, F2 and F3 forms a basis of chromatic colors of a first color system and F4, F5 and F6 forms a basis of chromatic colors of a second color system.
  • the color location of F1 can be close to cyan corresponding to F2 for magenta, F3 for yellow, F4 for orange, F5 for green and F6 for violet.
  • the chromatic colors F1 to F6 can also occupy other color locations.
  • the configuration K C M Y C M Y (A) offers the advantage that the group C M Y occurs twice in the same arrangement.
  • the configuration K C M Y Y M C offers the advantage that Y and O are both bright colors and therefore an easy change of ink to K C M Y O G V is possible with little cleaning effort and cleaning agent consumption. The same applies even more to K C M Y Y G V (configuration (D) not according to the invention) when changing to K C M Y O G V.
  • the configuration K C C M M Y Y offers the advantage that the printing stations for the same chromatic colors are arranged one after the other.
  • each printing station at which an ink change takes place has one Supply module for a first ink, a supply module for a second ink and a supply module for a first cleaning liquid and that cleaning takes place between printing with the first ink and printing with the second ink, with a switch being made between the supply modules.
  • a further development of the method according to the invention can be characterized in that an eighth printing station prints a fourth partial image of the printed image with black ink and with half the print resolution, such that the third and fourth partial images add up to the black or achromatic portion of the printed image.
  • the black part (like the colored part) is also printed in high resolution.
  • a further development of the method according to the invention can also be characterized in that the printing stations are arranged in succession in the transport direction in the following configuration: K K F1 F2 F3 F4 F5 F6.
  • the two partial images of the black portion are printed first. However, it is preferred to produce the black component with only one printing station, particularly preferably the first printing station, and to produce the colored components with two printing stations each.
  • a fourth partial image complementary to the black, third partial image can also advantageously be generated from the chromatic colors of the first and / or second color system, i.e. Black or the darkest possible shade is then mixed from bright colors.
  • the provision of an additional (possibly eighth) printing station can then be avoided with a cost advantage.
  • Figure 1 show the Figure 1 shows a sheet-processing ink printing machine 10 for the industrial production of multi-colored print products in the inkjet printing process, which is suitable for performing the method according to the invention.
  • the machine comprises a stack feeder 13, a so-called precoat unit 14 for applying a pre-coating, an inkjet printing unit 15 for image-wise printing of the sheets 11, a coating unit 17 and a stack delivery unit 19.
  • the sheets are passed through with cylinders the machine transports and preferably consists of paper, alternatively of cardboard.
  • the printing unit comprises seven printing stations 1 to 7 arranged one after the other in the sheet transport direction for transferring ink drops, preferably the process colors black, cyan, magenta, yellow, orange, green and violet.
  • Each station comprises an arrangement of print heads that are essentially immobile in the transport direction, each with a large number of individually controllable print nozzles for generating the drops (“drop on demand” or DOD).
  • the stations enable page-wide printing of the sheets in the so-called single-pass mode, ie the sheets only reach the effective area of the stations once.
  • the inks are water-based inks, the drops of which react with the precoating to form high-definition print dots, and contain pigments as colorants.
  • the dryer 18 is a thermal dryer with infrared emitters, preferably LED emitters, and serves to evaporate the water from the printed ink or from the printing material. Additional dryers can also be provided, for example after the precoat and lacquer works and in the delivery.
  • the machine also includes a machine controller with a computer and a control program running on the computer, it being possible for the computer to be part of an operating console (not shown). Also not shown are a device for supplying the printing stations with inks and a device for cleaning the print heads.
  • the printing material is fed from the feeder 13 to the inkjet printing unit 15 and lies there on the surface of a cylinder 16.
  • the cylinder can be driven by a motor 16 'directly or indirectly via a gear at a variable speed.
  • the printing press in Figure 1 has a configuration A.
  • the seven printing stations 1 to 7 are supplied with ink in such a way that inks of the following colors are printed on the substrate in the following order: black or K, cyan or C, magenta or M, yellow or Y and again cyan, magenta and yellow.
  • Configuration A enables the production of a four-color printed image. Since two printing stations are provided for each of the three chromatic colors CMY, it is advantageously possible to generate print images with a predetermined print resolution and to increase the transport speed of the printing material 11 and to maximally double it.
  • print heads 1A to 7A which are designed for a print resolution of 1200 dpi, can be used to generate a print image which has a predetermined print resolution of 1200 dpi in the colored part.
  • a print image with 1,200 dpi can be generated in color at up to a maximum of twice the production speed.
  • Figure 1 also shows alternative configurations B to F, in which the illustrated printing press 10 can also be operated.
  • the seven printing stations 1 to 7 are each supplied with the corresponding inks or process colors.
  • the press shown can remain in the same configuration across multiple print jobs.
  • a device provided for such an ink change is shown in Figure 3 shown.
  • the configurations D, F shown are not configurations according to the invention.
  • FIG. 2A shows a print image as it is generated according to the prior art. To simplify matters, only one color is shown.
  • the print image 20 is composed of print lines 20 ′ which are essentially perpendicular to the transport direction 12. For this purpose, a print head is actuated with a print cycle and printed line by line onto the printing material 11.
  • the print image 20 in Figure 2B is composed of a first partial image 21 or first or even-numbered print lines 25 (which are printed first) and a second partial image 22 or second or odd-numbered print lines 26 (which are subsequently printed between the first lines). Again, only one printed image from one color is shown for simplicity.
  • Figure 2C shows that instead of the in Figure 2B lines shown, the first printed image 21 can also be a first checkerboard-like half 27 and the second printed image 22 can be a preferably complementary, second checkered-like half 28 of the printed image 20.
  • the first print lines 25 in Figure 2B and the first checkerboard half 27 in Figure 2C are printed by a first printhead of a chromatic color.
  • the second print lines 26 in Figure 2B and the second checkerboard half 28 in Figure 2C are printed by a second print head of the same color.
  • the two print heads in configuration A would be print heads 2A of print station 2 and print heads 5A of print station 5. The same applies to the remaining chromatic colors.
  • FIG. 2D the line-by-line structure of a third partial image 23 of the printed image 20 for the black component or the achromatic component is shown.
  • This is shown on the left in the example Figure 2D generated with only one printhead.
  • this would be print head 1A of print station 1.
  • a comparison of the left side of the Figure 2D and the respective right side of the Figures 2B and 2C shows that the black portion or achromatic portion of the printed image 20 has a lower print resolution than the colored portion (for example half the print resolution). It can therefore, as on the right side of the Figure 2D shown, be provided to provide an eighth print station 8 with an eighth print head 8A.
  • a fourth partial image 24 complementary to the third partial image 23 can be generated.
  • FIG. 3 shows a device for ink change 30.
  • a device for ink change 30.
  • the device comprises a supply module 31a for first ink, a supply module 31b for second ink and a supply module 31c for cleaning liquid.
  • the inks flow through a print head 32 or its upstream line system 33 and downstream line system 34 (so-called manifolds).
  • the supply module 31a (and also the supply module 31b in a corresponding manner) has a pump 36a, a pump 36b, a tank 37, a degaser 38 and a filter 39.
  • the ink flows from the supply module via a switch 35a to the print head and from there via a switch 35b back to the supply module.
  • the switch can e.g. B.
  • the changeover switch can be designed as changeover valves.
  • the changeover switch can be used to switch between the supply modules 31a and 31b for ink.
  • it is e.g. B. possible between the in Figure 1 shown to change different configurations A to F or to perform a corresponding ink change at the affected printing stations 1 to 8.
  • a device for the ink change 30 need only be provided at those printing stations 1 to 8 at which an ink change actually takes place.
  • the first printing station 1, which prints black ink in all configurations, needs e.g. B. have no such device 30.
  • the changeover switch can also be used to pass a cleaning liquid through the lines and the printhead in order to carry out cleaning before the introduction of new ink.
  • Figure 4 shows a color space 40 or the known CIE color triangle with two axes 41.
  • the color locations of the colors C, M, Y, O, G, V and also the colors F1 to F6 are shown in the illustration. Only exemplary color locations were selected for the latter.
  • the chromatic colors of the first color system F1 to F3 and the chromatic colors of the second color system F4 to F6 each lie in the areas delimited by the dashed lines.

Description

Die vorliegende Erfindung betrifft ein Verfahren zum Betreiben einer Mehrfarben-Tintendruckmaschine mit den Merkmalen von Anspruch 1.The present invention relates to a method for operating a multicolor ink printing machine with the features of claim 1.

Die Erfindung liegt auf dem technischen Gebiet der grafischen Industrie und dort insbesondere im Bereich des Tintendrucks (Inkjet). Bei dem bekannten DOD-Tintendruckverfahren (drop-on-demand) wird ein Druckbild auf einem Bedruckstoff erzeugt, indem ein Druckkopf dem zu druckenden Bild entsprechend feinste Tintentropfen erzeugt und diese berührungslos auf den Bedruckstoff überträgt. Der Bedruckstoff kann aus Papier, Karton oder Kunststoff bestehen und bogen- oder bahnförmig sein.The invention is in the technical field of the graphics industry and there in particular in the field of ink printing. In the known DOD ink printing method (drop-on-demand), a print image is generated on a printing material by a print head producing the finest ink drops corresponding to the image to be printed and transferring these onto the printing material without contact. The printing material can consist of paper, cardboard or plastic and can be arched or web-shaped.

Eine unter dem Produktnamen "Primefire" bekannte und von der Heidelberger Druckmaschinen AG konzipierte Tintendruckmaschine für die industrielle Produktion bedruckt Papierbogen mit wasserbasierten Inkjet-Tinten. Die Maschine umfasst sieben aufeinander folgende Druckstationen, welche die Farben CMYK (Cyan, Magenta, Gelb und Schwarz) und OGV (Orange, Grün, Violett) mit feststehenden Druckköpfen auf das Papier übertragen.An ink printing machine for industrial production, known under the product name "Primefire" and designed by Heidelberger Druckmaschinen AG, prints paper sheets with water-based inkjet inks. The machine comprises seven consecutive printing stations, which transfer the colors CMYK (cyan, magenta, yellow and black) and OGV (orange, green, violet) to the paper with fixed print heads.

Die EP 373 957 A1 beschreibt demgegenüber eine Druckmaschine mit bewegten Druckköpfen. Industrielle Produktionsgeschwindigkeiten werden infolge des Hin- und Herbewegens der Köpfe in der Regel nicht erreicht. Allerdings offenbart das Dokument eine Möglichkeit, die Produktionsgeschwindigkeit wenigstens zu erhöhen. Anstatt mit den vier Farben CMYK zu drucken, kann auch nur mit Schwarz, also in der Konfiguration KKKK gedruckt werden. Dabei lässt sich die Produktionsgeschwindigkeit vervierfachen.The EP 373 957 A1 in contrast, describes a printing press with moving print heads. Industrial production speeds are generally not achieved due to the head being moved back and forth. However, the document discloses a way to at least increase the production speed. Instead of printing with the four colors CMYK, it is also possible to print only with black, i.e. in the KKKK configuration. The production speed can be quadrupled.

Grundsätzlich besteht seitens der Druckmedien-Hersteller der Wunsch, Druckprodukte immer schneller zu produzieren, d.h. Druckmaschinen mit immer höherer Produktionsgeschwindigkeit zu betreiben. Daneben besteht jedoch auch der Wunsch, Kosten zu sparen, z.B. bereits beim Kauf verschiedener Druckmaschinen für verschiedene Anforderungen, aber auch bei deren Betrieb.In principle, there is a desire on the part of the print media manufacturer to produce printed products faster and faster, ie to operate printing machines at ever higher production speeds. However, there is also a desire Saving costs, for example when purchasing different printing presses for different requirements, but also when operating them.

Vor diesem Hintergrund ist es eine Aufgabe der vorliegenden Erfindung, ein gegenüber dem Stand der Technik verbessertes Verfahren zu schaffen, welches es ermöglicht, hochwertige Druckprodukte, d.h. Druckprodukte mit hoher Auflösung wenigstens im Buntanteil des Druckbilds, bei hoher Druckgeschwindigkeit zu produzieren. Eine weitere Aufgabe ist es, ein Verfahren zu schaffen, welches es ermöglicht, eine Druckmaschine variabel einzusetzen, d.h. in Abhängigkeit des Druckauftrags in einer passenden Farb-Konfiguration zu betreiben.Against this background, it is an object of the present invention to provide a method which is improved over the prior art and which enables high-quality printed products, i.e. To produce print products with high resolution at least in the colored part of the print image at high print speed. Another object is to create a method which enables a printing press to be used variably, i.e. depending on the print job in a suitable color configuration.

Die EP1826005A1 offenbart eine Tintenstrahlaufzeichnungsvorrichtung, die mit einem Aufzeichnungskopf ausgestattet ist, um einen Typ oder mehrere Typen von Tinten, die eine durch Licht härtbare Komponente enthalten, auf ein Aufzeichnungsmedium auszustoßen, und eine Lichtbestrahlungsvorrichtung, um die Tinte durch Ausstrahlen von Licht auf die abgelagerte Tinte zu härten..The EP1826005A1 discloses an ink jet recording apparatus equipped with a recording head for ejecting one or more types of inks containing a photo-curable component onto a recording medium, and a light irradiation device for curing the ink by emitting light onto the deposited ink ..

Die DE3932462A1 offenbart einen Mehrfarbentintenstrahldrucker. Dieser hat einen Druckkopf, der selektiv mit einem Tintenreservoir verbunden ist, von dem jedes eine unterschiedliche Farbtinte hat. Ein zusätzliches Reservoir enthält eine Reinigungsflüssigkeit. Der Druckkopf empfängt Tinte aus den Vorratsbehältern durch eine einzige Zufuhrröhre. Jeder Behälter ist über ein Regelventil mit dem Schlauch verbunden. Eine zentrale Steuereinheit erzeugt Signale, um die Ventile zu betreiben und die ausgewählte Farbtinte zuzuführen.The DE3932462A1 discloses a multi-color inkjet printer. This has a printhead that is selectively connected to an ink reservoir, each of which has a different color ink. An additional reservoir contains a cleaning liquid. The printhead receives ink from the reservoirs through a single supply tube. Each container is connected to the hose via a control valve. A central control unit generates signals to operate the valves and to supply the selected color ink.

Die US2011/227973A1 offenbart eine modulare Druckvorrichtung, die mit einer unterschiedlichen Anzahl von Tintenfarben und Tintentypen und mit einer unterschiedlichen Druckauflösung quer zur Prozessrichtung für jede Tintenfarbe und jeden Tintentyp konfiguriert werden kann. Die modulare Druckvorrichtung, die zum Drucken mit mehreren Kombinationen von Tintenfarben und Tintentypen bei unterschiedlichen Druckauflösungen konfiguriert werden kann, umfasst eine Vielzahl von Druckkopfanordnungen, wobei jede Druckkopfanordnung so konfiguriert ist, dass sie Tinte mit einer ersten Druckauflösung auf eine Bildaufnahmefläche ausstößt. Und wobei jede Tintenversorgung so konfiguriert ist, dass sie Tinte speichert und Tinte an eine Druckkopfanordnung in der Vielzahl von Druckkopfanordnungen liefert. Und mit einer Steuerung, die konfiguriert ist, um die Vielzahl von Druckkopfanordnungen in einer von mindestens zwei Kombinationen von zu betreiben.The US2011 / 227973A1 discloses a modular printing device that can be configured with a different number of ink colors and types and with a different print resolution across the process direction for each ink color and type. The modular printing device, which can be configured to print with multiple combinations of ink colors and types of ink at different print resolutions, includes a variety of printhead assemblies, each printhead assembly configured to receive ink with a first print resolution on an image recording surface. And each ink supply is configured to store ink and deliver ink to a printhead assembly in the plurality of printhead assemblies. And with a controller configured to operate the plurality of printhead assemblies in one of at least two combinations of.

Diese Aufgaben werden erfindungsgemäß durch ein Verfahren nach Anspruch 1 gelöst. Vorteilhafte und daher bevorzugte Weiterbildungen der Erfindung ergeben sich aus den Unteransprüchen sowie aus der Beschreibung und den Zeichnungen.According to the invention, these objects are achieved by a method according to claim 1. Advantageous and therefore preferred developments of the invention result from the subclaims and from the description and the drawings.

Die Erfindung betrifft ein Verfahren zum Betreiben einer Mehrfarben-Tintendruckmaschine mit wenigstens sieben Druckstationen, wobei Druckköpfe der Druckstationen ein wenigstens vierfarbiges Druckbild auf einen in eine Transportrichtung bewegten Bedruckstoff mit einer in die Transportrichtung vorgegebenen Druckauflösung des Buntanteils des Druckbilds gedruckt wird, wobei beim Drucken eines vierfarbigen Druckbildes drei Druckstationen ein erstes Teilbild des Druckbilds mit Buntfarben eines ersten Farbsystems und mit der halben vorgegebenen Druckauflösung drucken und drei weitere Druckstationen ein zum ersten Teilbild komplementäres, zweites Teilbild des Druckbilds mit Buntfarben eines zweiten, zum ersten Farbsystem gleichen Farbsystems und mit der halben vorgegebenen Druckauflösung drucken, derart, dass sich das erste und das zweite Teilbild zum Buntanteil des Druckbilds mit der vorgegebenen Druckauflösung ergänzen und wobei wenigstens eine weitere Druckstation ein drittes Teilbild des Druckbilds mit schwarzer Tinte und mit der halben vorgegebenen Druckauflösung druckt, wobei das erste Farbsystem folgende Buntfarben umfasst:

  • C bzw. Cyan, M bzw. Magenta und Y bzw. Gelb, oder
  • O bzw. Orange, G bzw. Grün und V bzw. Violett, dass das zweite Farbsystem folgende Buntfarben umfasst:
  • C bzw. Cyan, M bzw. Magenta und Y bzw. Gelb, oder
  • O bzw. Orange, G bzw. Grün und V bzw. Violett,
dass die Druckstationen in Transportrichtung in einer der folgenden Konfigurationen (A, B, C, D, E, F) aufeinander folgend angeordnet sind:
  • K C M Y C M Y (A), oder
  • KCMYYM C (B), oder
  • K C M Y O G V (C), oder
  • K C C M M Y Y (E),
dass zwischen zwei Druckaufträgen ein Tintenwechsel erfolgt, wobei die Konfiguration der Druckstationen wie folgt wechselt:
  • von K C M Y C M Y (A) nach K C M Y O G V (C) oder umgekehrt (C, A), oder
  • von K C M Y Y M C (B) nach K C M Y O G V (C) oder umgekehrt (C, B), oder
  • von K C C M M Y Y (E) nach K C M Y O G V (C) oder umgekehrt (C, E),
    wobei in der Konfiguration K C M Y O G V ein siebenfarbiges Druckbild mit der halben Druckauflösung gedruckt wird, und wobei von einem ersten Modus für die Produktion von siebenfarbigen Druckprodukten in der Konfiguration K C M Y O G V bei maximaler erster Produktionsgeschwindigkeit v1 in einen zweiten Modus für die Produktion von vierfarbigen Druckprodukten in einer der Konfigurationen K C M Y C M Y, K CMYYMC oder K C C M M Y Y bei maximaler zweiter Produktionsgeschwindigkeit v2 - oder umgekehrt - gewechselt wird, wobei v2 = 2 ∗ v1.
The invention relates to a method for operating a multicolor ink printing machine with at least seven printing stations, print heads of the printing stations printing an at least four-color print image on a printing material moved in a transport direction with a print resolution of the colored portion of the printed image predetermined in the transport direction, wherein when printing a four-color one Print image three printing stations print a first partial image of the printed image with chromatic colors of a first color system and with half the predetermined print resolution and three further printing stations print a complementary second partial image of the printed image with chromatic colors of a second color system that is identical to the first color system and with half the predetermined print resolution print in such a way that the first and the second partial image complement the colored portion of the printed image with the predetermined print resolution and at least one further printing station has a third partial image d of the printed image is printed with black ink and with half the specified print resolution, the first color system comprising the following chromatic colors:
  • C or cyan, M or magenta and Y or yellow, or
  • O or orange, G or green and V or violet, that the second color system includes the following chromatic colors:
  • C or cyan, M or magenta and Y or yellow, or
  • O or orange, G or green and V or violet,
that the printing stations are arranged in succession in one of the following configurations (A, B, C, D, E, F):
  • KCMYCMY (A), or
  • KCMYYM C (B), or
  • KCMYOGV (C), or
  • KCCMMYY (E),
that there is an ink change between two print jobs, whereby the configuration of the print stations changes as follows:
  • from KCMYCMY (A) to KCMYOGV (C) or vice versa (C, A), or
  • from KCMYYMC (B) to KCMYOGV (C) or vice versa (C, B), or
  • from KCCMMYY (E) to KCMYOGV (C) or vice versa (C, E),
    wherein in the configuration KCMYOGV a seven-color print image with half the print resolution is printed, and wherein from a first mode for the production of seven-color print products in the configuration KCMYOGV at maximum first production speed v1 to a second mode for the production of four-color print products in one of the configurations KCMYCMY, K CMYYMC or KCCMMYY at maximum second production speed v2 - or vice versa - is changed, where v2 = 2 ∗ v1.

Erfindungsgemäß setzt sich der Buntanteil des Druckbilds aus Teilbildern zusammen. Beide Teilbilder zusammen ergeben die gewünschte Druckauflösung. Der Schwarzanteil dagegen wird, sofern nur eine Druckstation für Schwarz vorgesehen ist, nur mit der Hälfte der gewünschten Druckauflösung gedruckt.According to the invention, the colored portion of the printed image is composed of partial images. Both drawing files together result in the desired print resolution. The black component, on the other hand, is only printed with half the desired print resolution if only one printing station is intended for black.

Eine bevorzugte Weiterbildung des erfindungsgemäßen Verfahrens kann sich dadurch auszeichnen, dass der Buntanteil des Druckbilds in der Transportrichtung aus aufeinander folgenden Druckzeilen aufgebaut wird und dass das erste Teilbild alle geradzahligen Zeilen des Buntanteils des Druckbilds umfasst und das zweite Teilbild alle ungeradzahligen Zeilen des Buntanteils des Druckbildes umfasst. "Geradzahlig" und "ungeradzahlig" stehen hier nur als Bezeichnung für abwechselnd aufeinander folgende Zeilen. Der Aufbau des Druckbilds aus komplementären Teilbildern unter Einsatz wenigstens zweier Druckköpfe ermöglicht in vorteilhafter Weise eine Erhöhung und maximal eine Verdopplung der Produktionsgeschwindigkeit.A preferred development of the method according to the invention can be characterized in that the colored part of the printed image in the transport direction is built up from successive print lines and that the first partial picture comprises all even-numbered lines of the colored part of the printed image and the second partial picture comprises all odd-numbered lines of the colored part of the printed image . "Even numbered" and "odd numbered" only stand for alternating lines. The construction of the print image from complementary partial images using at least two print heads advantageously enables the production speed to be increased and at most doubled.

Eine bevorzugte Weiterbildung des erfindungsgemäßen Verfahrens kann sich dadurch auszeichnen, dass der Buntanteil des Druckbilds schachbrettartig aufgebaut wird und dass das erste Teilbild eine erste schachbrettartige Hälfte des Buntanteils des Druckbilds umfasst und das zweite Teilbild eine zur ersten Hälfte komplementäre zweite schachbrettartige Hälfte des Buntanteils des Druckbildes umfasst. Auch auf diese Weise kann die Druckgeschwindigkeit maximal verdoppelt werden. Das schachbrettartige Drucken führt in vorteilhafter Weise zu einem "ruhigeren" Druckbild.A preferred development of the method according to the invention can be characterized in that the colored portion of the printed image is constructed in a checkerboard manner and that the first partial image comprises a first checkered half of the colored portion of the printed image and the second partial image comprises a second checkered half of the colored portion of the printed image that is complementary to the first half . The printing speed can also be doubled in this way too. Checkerboard-like printing advantageously leads to a "quieter" print image.

In der Konfiguration K C M Y O G V (C) kann die zweite Gruppe O G V die erste Gruppe C M Y simulieren, d.h. C, M und Y werden dann aus den Buntfarben O, G und V gemischt. Die Druckdaten werden hierzu entsprechend in der Druckvorstufe aufbereitet. Bevorzugt wird dabei das schachbrettartige Drucken zweier komplementärer Teilbilder aus C M Y und O G V. Eine Druckmaschine in der Konfiguration K C M Y O G V bietet daher den Vorteil, dass die Gruppe O G V entweder zur Erweiterung des Farbraums verwendet werden kann (bei der Produktion von siebenfarbigen Druckprodukten) oder zur Verdopplung der Druckgeschwindigkeit (bei der Produktion von nur vierfarbigen Druckprodukten mi sieben aktiven Druckstationen).In the configuration K C M Y O G V (C) the second group O G V can simulate the first group C M Y, i.e. C, M and Y are then mixed from the chromatic colors O, G and V. The print data are prepared accordingly in prepress. The checkerboard-like printing of two complementary partial images from CMY and OG V is preferred. A printing press in the KCMYOGV configuration therefore offers the advantage that the OGV group can either be used to expand the color space (in the production of seven-color printed products) or to double the Print speed (when producing only four-color print products with seven active printing stations).

Ebenso kann in der Konfiguration K C M Y Y G V (D), nicht erfindungsgemäß, die Gruppe C, M und Y durch die Y, G und V simuliert werden. Da Gelb als eine der hellsten Farben in der additiven Farbmischung nur schlecht aus anderen Farben gemischt werden kann, wird die Konfiguration K C M Y Y G V der Konfiguration K C M Y O G V bevorzugt.Likewise, in the configuration K C M Y Y G V (D), not according to the invention, the groups C, M and Y can be simulated by the Y, G and V. Since yellow, as one of the brightest colors in the additive color mixture, can only be mixed from other colors with difficulty, the configuration CCMYYGV is preferred over the configuration CCMYOGV.

In der Konfiguration K F1 F2 F3 F4 F5 F6 (F), nicht erfindungsgemäß , bildet die erste Gruppe F1, F2 und F3 eine Basis von Buntfarben eines ersten Farbsystems und F4, F5 und F6 eine Basis von Buntfarben eines zweiten Farbsystems. Der Farbort von F1 kann z.B. nahe bei Cyan liegen, entsprechend F2 bei Magenta, F3 bei Gelb, F4 bei Orange, F5 bei Grün und F6 bei Violett. Alternativ können die Buntfarben F1 bis F6 auch andere Farborte belegen.In the configuration K F1 F2 F3 F4 F5 F6 (F), not according to the invention, the first group F1, F2 and F3 forms a basis of chromatic colors of a first color system and F4, F5 and F6 forms a basis of chromatic colors of a second color system. For example, the color location of F1 can be close to cyan corresponding to F2 for magenta, F3 for yellow, F4 for orange, F5 for green and F6 for violet. Alternatively, the chromatic colors F1 to F6 can also occupy other color locations.

Die Konfiguration K C M Y C M Y (A) bietet den Vorteil, dass die Gruppe C M Y in gleicher Anordnung doppelt vorkommt. Die Konfiguration K C M Y Y M C bietet den Vorteil, dass Y und O beides helle Farben sind und daher ein problemloser Tintenwechsel zu K C M Y O G V mit geringem Reinigungsaufwand und Reinigungsmittelverbrauch möglich ist. Entsprechendes gilt erst recht für K C M Y Y G V (nicht erfindungsgemäße Konfiguration (D)) beim Wechsel zu K C M Y O G V. Die Konfiguration K C C M M Y Y bietet den Vorteil, dass die Druckstationen für dieselben Buntfarben nacheinander angeordnet sind.The configuration K C M Y C M Y (A) offers the advantage that the group C M Y occurs twice in the same arrangement. The configuration K C M Y Y M C offers the advantage that Y and O are both bright colors and therefore an easy change of ink to K C M Y O G V is possible with little cleaning effort and cleaning agent consumption. The same applies even more to K C M Y Y G V (configuration (D) not according to the invention) when changing to K C M Y O G V. The configuration K C C M M Y Y offers the advantage that the printing stations for the same chromatic colors are arranged one after the other.

Durch den Tintenwechsel wird es in vorteilhafter Weise möglich, eine Druckmaschine mit sieben Druckstationen in einem ersten Modus für die Produktion von siebenfarbigen Druckprodukten bei maximaler erster Produktionsgeschwindigkeit v1 einzusetzen und dieselbe Maschine in einem zweiten Modus für die Produktion von vierfarbigen Druckprodukten bei maximaler zweiter Produktionsgeschwindigkeit v2 einzusetzen, wobei v2=2∗v1. Falls gewünscht, d.h. durch entsprechende Druckaufträge bedingt, kann zwischen "schnellem" Drucken von sieben Farben und "sehr schnellem" Drucken von nur vier Farben gewechselt werden.The ink change advantageously makes it possible to use a printing machine with seven printing stations in a first mode for the production of seven-color printed products at the maximum first production speed v1 and to use the same machine in a second mode for the production of four-color printed products at the maximum second production speed v2 , where v2 = 2 ∗ v1. If desired, ie due to appropriate print jobs, you can switch between "fast" printing of seven colors and "very fast" printing of only four colors.

Eine bevorzugte Weiterbildung des erfindungsgemäßen Verfahrens kann sich dadurch auszeichnen, dass jede Druckstation, an welcher ein Tintenwechsel erfolgt, ein Versorgungsmodul für eine erste Tinte, ein Versorgungsmodul für eine zweite Tinte und ein Versorgungsmodul für eine erste Reinigungsflüssigkeit umfasst und dass zwischen dem Drucken mit der ersten Tinte und dem Drucken mit der zweiten Tinte eine Reinigung erfolgt, wobei zwischen den Versorgungsmodulen umgeschaltet wird.A preferred development of the method according to the invention can be characterized in that each printing station at which an ink change takes place has one Supply module for a first ink, a supply module for a second ink and a supply module for a first cleaning liquid and that cleaning takes place between printing with the first ink and printing with the second ink, with a switch being made between the supply modules.

Eine Weiterbildung des erfindungsgemäßen Verfahrens kann sich dadurch auszeichnen, dass eine achte Druckstation ein viertes Teilbild des Druckbilds mit schwarzer Tinte und mit der halben Druckauflösung druckt, derart, dass sich das dritte und das vierte Teilbild zum Schwarzanteil bzw. Unbuntanteil des Druckbilds ergänzen. In dieser Konfiguration wird somit auch der Schwarzanteil (wie der Buntanteil) in hoher Auflösung gedruckt. Eine Weiterbildung des erfindungsgemäßen Verfahrens kann sich auch dadurch auszeichnen, dass die Druckstationen in Transportrichtung in der folgenden Konfiguration aufeinander folgend angeordnet sind: K K F1 F2 F3 F4 F5 F6. In vorteilhafter Weise werden hier die beiden Teilbilder des Schwarzanteils als erstes gedruckt. Bevorzugt wird allerdings, den Schwarzanteil mit nur einer Druckstation, besonders bevorzugt der ersten Druckstation zu erzeugen und die Buntanteile mit je zwei Druckstationen zu erzeugen. Falls ein Schwarzanteil in hoher Druckauflösung gewünscht ist, kann in vorteilhafter Weise ein zum schwarzen, dritten Teilbild komplementäres viertes Teilbild auch aus den Buntfarben des ersten und/oder zweiten Farbsystem erzeugt werden, d.h. Schwarz bzw. ein möglichst dunkler Farbton wird dann aus Buntfarben gemischt. Das Vorsehen einer zusätzlichen (ggf. achten) Druckstation kann dann mit Kostenvorteil vermieden werden.A further development of the method according to the invention can be characterized in that an eighth printing station prints a fourth partial image of the printed image with black ink and with half the print resolution, such that the third and fourth partial images add up to the black or achromatic portion of the printed image. In this configuration, the black part (like the colored part) is also printed in high resolution. A further development of the method according to the invention can also be characterized in that the printing stations are arranged in succession in the transport direction in the following configuration: K K F1 F2 F3 F4 F5 F6. In an advantageous manner, the two partial images of the black portion are printed first. However, it is preferred to produce the black component with only one printing station, particularly preferably the first printing station, and to produce the colored components with two printing stations each. If a black portion in high print resolution is desired, a fourth partial image complementary to the black, third partial image can also advantageously be generated from the chromatic colors of the first and / or second color system, i.e. Black or the darkest possible shade is then mixed from bright colors. The provision of an additional (possibly eighth) printing station can then be avoided with a cost advantage.

Die Erfindung und deren bevorzugte Weiterbildungen werden nachfolgend unter Bezug auf die Zeichnungen anhand eines bevorzugten Ausführungsbeispiels näher beschrieben. Zur besseren Übersichtlichkeit sind in den Zeichnungen einander entsprechende Elemente mit denselben Bezugszeichen versehen und Bezugszeichen, welche sich bloß wiederholen, teils weggelassen.The invention and its preferred developments are described below with reference to the drawings using a preferred embodiment. For the sake of clarity, elements that correspond to one another are provided with the same reference symbols in the drawings, and reference symbols that merely repeat are partly omitted.

Zeichnungen zeigen:

Figur 1
Druckmaschine zur Durchführung des erfindungsgemäßen Verfahrens;
Figur 2A
Druckbild nach dem Stand der Technik;
Figur 2B
Buntanteil eines erfindungsgemäß zusammengesetzten Druckbilds;
Figur 2C
Buntanteil eines erfindungsgemäß zusammengesetzten Druckbilds;
Figur 2D
Schwarzanteil eines erfindungsgemäß zusammengesetzten Druckbilds;
Figur 3
Einrichtung für den Tintenwechsel; und
Figur 4
Farbraum.
Drawings show:
Figure 1
Printing machine for carrying out the method according to the invention;
Figure 2A
State of the art print image;
Figure 2B
Color component of a printed image composed according to the invention;
Figure 2C
Color component of a printed image composed according to the invention;
Figure 2D
Black portion of a printed image composed according to the invention;
Figure 3
Ink exchange device; and
Figure 4
Color space.

Figur 1 zeigt Die Figur 1 zeigt eine bogen verarbeitende Tintendruckmaschine 10 für die industrielle Produktion mehrfarbiger Druckprodukte im Inkjet-Druckverfahren, welche zur Durchführung des erfindungsgemäßen Verfahrens geeignet ist. Die Maschine umfasst einen Stapel-Anleger 13, ein so genanntes Precoat-Werk 14 für den Auftrag einer Vorbeschichtung, ein Inkjet-Druckwerk15 für das bildgemäße Bedrucken der Bogen 11, ein Lackwerk 17 und einen Stapel-Ausleger 19. Die Bogen werden mit Zylindern durch die Maschine transportiert und bestehen bevorzugt aus Papier, alternativ aus Karton. Das Druckwerk umfasst sieben in Bogen-Transportrichtung aufeinander folgend angeordnete Druckstationen 1 bis 7 zum Übertragen von Tintentropfen, bevorzugt der Prozess-Farben Schwarz, Cyan, Magenta, Gelb, Orange, Grün und Violett. Jede Station umfasst eine im Wesentlichen quer zur Transportrichtung ausgerichtete Anordnung von im Druckbetrieb unbewegten Druckköpfen mit je einer Vielzahl an einzeln ansteuerbaren Druckdüsen zum Erzeugen der Tropfen ("Drop on demand" bzw. DOD). Die Stationen ermöglichen das seitenbreite Bedrucken der Bogen im so genannten single-pass-Betrieb, d.h. die Bogen gelangen nur einmal in den Wirkbereich der Stationen. Die Tinten sind wasserbasierte Tinten, deren Tropfen mit der Vorbeschichtung reagieren um Druckpunkte hoher Punktschärfe zu bilden, und enthalten als Farbmittel Pigmente. Der Trockner 18 ist ein thermischer Trockner mit Infrarot-Strahlern, bevorzugt LED-Strahlern, und dient dem Verdampfen des Wassers aus der verdruckten Tinte bzw. aus dem Bedruckstoff. Es können auch weitere Trockner vorgesehen sein, z.B. nach dem Precoat- und dem Lack-Werk und im Ausleger. Die Maschine umfasst auch eine Maschinensteuerung mit einem Rechner und einem auf dem Rechner laufenden Steuerprogramm, wobei der Rechner Teil eines nicht dargestellten Bedienpults sein kann. Ebenfalls nicht dargestellt sind eine Einrichtung zur Versorgung der Druckstationen mit Tinten und eine Einrichtung zur Reinigung der Druckköpfe. Figure 1 show the Figure 1 shows a sheet-processing ink printing machine 10 for the industrial production of multi-colored print products in the inkjet printing process, which is suitable for performing the method according to the invention. The machine comprises a stack feeder 13, a so-called precoat unit 14 for applying a pre-coating, an inkjet printing unit 15 for image-wise printing of the sheets 11, a coating unit 17 and a stack delivery unit 19. The sheets are passed through with cylinders the machine transports and preferably consists of paper, alternatively of cardboard. The printing unit comprises seven printing stations 1 to 7 arranged one after the other in the sheet transport direction for transferring ink drops, preferably the process colors black, cyan, magenta, yellow, orange, green and violet. Each station comprises an arrangement of print heads that are essentially immobile in the transport direction, each with a large number of individually controllable print nozzles for generating the drops (“drop on demand” or DOD). The stations enable page-wide printing of the sheets in the so-called single-pass mode, ie the sheets only reach the effective area of the stations once. The inks are water-based inks, the drops of which react with the precoating to form high-definition print dots, and contain pigments as colorants. The dryer 18 is a thermal dryer with infrared emitters, preferably LED emitters, and serves to evaporate the water from the printed ink or from the printing material. Additional dryers can also be provided, for example after the precoat and lacquer works and in the delivery. The machine also includes a machine controller with a computer and a control program running on the computer, it being possible for the computer to be part of an operating console (not shown). Also not shown are a device for supplying the printing stations with inks and a device for cleaning the print heads.

Der Bedruckstoff wird vom Anleger 13 zum Inkjet-Druckwerk 15 geführt und liegt dort auf der Oberfläche eines Zylinders 16. Der Zylinder kann von einem Motor 16' direkt oder indirekt über ein Getriebe mit einer veränderbaren Geschwindigkeit angetrieben werden.The printing material is fed from the feeder 13 to the inkjet printing unit 15 and lies there on the surface of a cylinder 16. The cylinder can be driven by a motor 16 'directly or indirectly via a gear at a variable speed.

Die Druckmaschine in Figur 1 weist eine Konfiguration A auf. In dieser Konfiguration sind die sieben Druckstationen 1 bis 7 derart mit Tinte versorgt, dass Tinten der folgenden Farben in der nachfolgend angegebenen Reihenfolge auf den Bedruckstoff aufgedruckt werden: Schwarz bzw. K, Cyan bzw. C, Magenta bzw. M, Gelb bzw. Y und nochmals Cyan, Magenta und Gelb. Die Konfiguration A ermöglicht die Herstellung eines vierfarbigen Druckbilds. Da für jede der drei Buntfarben CMY zwei Druckstationen vorgesehen sind, ist es in vorteilhafterweise möglich, Druckbilder mit vorgegebener Druckauflösung zu erzeugen und dabei die Transportgeschwindigkeit des Bedruckstoffs 11 zu erhöhen und maximal zu verdoppeln. So kann beispielsweise mit Druckköpfen 1A bis 7A, welche für eine Druckauflösung von 1.200 dpi ausgelegt sind, ein Druckbild erzeugt werden, welches im Buntanteil eine vorgegebene Druckauflösung von 1.200 dpi aufweist. Im Vergleich zu einer herkömmlichen Druckmaschine, welche bei gleichem Aufbau 7 Farben druckt, also z. B. K C M Y O G V, kann ein Druckbild mit 1.200 dpi im Buntanteil bei bis zu maximal doppelter Produktionsgeschwindigkeit erzeugt werden.The printing press in Figure 1 has a configuration A. In this configuration, the seven printing stations 1 to 7 are supplied with ink in such a way that inks of the following colors are printed on the substrate in the following order: black or K, cyan or C, magenta or M, yellow or Y and again cyan, magenta and yellow. Configuration A enables the production of a four-color printed image. Since two printing stations are provided for each of the three chromatic colors CMY, it is advantageously possible to generate print images with a predetermined print resolution and to increase the transport speed of the printing material 11 and to maximally double it. For example, print heads 1A to 7A, which are designed for a print resolution of 1200 dpi, can be used to generate a print image which has a predetermined print resolution of 1200 dpi in the colored part. Compared to a conventional printing machine, which prints 7 colors with the same structure, e.g. B. KCMYOGV, a print image with 1,200 dpi can be generated in color at up to a maximum of twice the production speed.

Für den Schwarzanteil bzw. den Unbuntanteil des Druckbilds steht in der Konfiguration A jedoch nur ein Druckkopf 1A zur Verfügung. Das bedeutet, dass im oben genannten Beispiel mit der vorgegebenen Druckauflösung von z.B. 1.200 dpi zwar im Buntanteil 1.200 dpi bei doppelter Produktionsgeschwindigkeit erreicht werden, der Schwarzanteil jedoch nur mit 600 dpi gedruckt wird. Die verringerte Druckauflösung im Schwarzanteil ist jedoch oft nicht störend, denn Schwarz wird in Bildern oft nur als Konturfarbe verwendet und in Textanteilen von Druckbildern ist eine hohe Druckauflösung und eine hohe Flächendeckung oft nicht erforderlich. Zudem kann Schwarz durch ein Mischen der drei Buntfarben kompensiert werden, jedoch nur begrenzt.In configuration A, however, only one print head 1A is available for the black portion or the achromatic portion of the printed image. This means that in the above example with the specified print resolution of e.g. 1,200 dpi can be achieved in the color portion 1,200 dpi at twice the production speed, but the black portion is only printed with 600 dpi. However, the reduced print resolution in the black portion is often not disturbing, because black is often only used as a contour color in images, and high print resolution and high area coverage are often not required in text portions of printed images. In addition, black can be compensated for by mixing the three chromatic colors, but only to a limited extent.

Figur 1 zeigt des Weiteren alternative Konfigurationen B bis F, in welchen die dargestellte Druckmaschine 10 ebenfalls betrieben werden kann. Hierzu werden die sieben Druckstationen 1 bis 7 jeweils mit den entsprechenden Tinten bzw. Prozessfarben versorgt. Figure 1 also shows alternative configurations B to F, in which the illustrated printing press 10 can also be operated. For this purpose, the seven printing stations 1 to 7 are each supplied with the corresponding inks or process colors.

Die dargestellte Druckmaschine kann über mehrere Druckaufträge hinweg in derselben Konfiguration verbleiben. Es ist andererseits auch möglich, die Druckmaschine in Abhängigkeit der Druckaufträge von einer Konfiguration in eine andere zu überführen. Hierzu ist gegebenenfalls ein Tintenwechsel an wenigstens einer Druckstation nötig. Eine für einen solchen Tintenwechsel vorgesehene Einrichtung ist in Figur 3 gezeigt. Die dargestellten Konfigurationen D, F sind keine erfindungsgemäßen Konfigurationen.The press shown can remain in the same configuration across multiple print jobs. On the other hand, it is also possible to transfer the printing machine from one configuration to another depending on the print jobs. This may require an ink change at at least one printing station. A device provided for such an ink change is shown in Figure 3 shown. The configurations D, F shown are not configurations according to the invention.

Figur 2A zeigt ein Druckbild, wie es nach dem Stand der Technik erzeugt wird. Vereinfachend ist dabei nur eine Buntfarbe dargestellt. Das Druckbild 20 setzt sich aus Druckzeilen 20' zusammen, welche im Wesentlichen senkrecht zur Transportrichtung 12 liegen. Hierzu wird ein Druckkopf mit einem Drucktakt angesteuert und dabei Zeile um Zeile auf den Bedruckstoff 11 bedruckt. Figure 2A shows a print image as it is generated according to the prior art. To simplify matters, only one color is shown. The print image 20 is composed of print lines 20 ′ which are essentially perpendicular to the transport direction 12. For this purpose, a print head is actuated with a print cycle and printed line by line onto the printing material 11.

Ein Vergleich zwischen den Figuren 2A und 2B zeigt den Unterschied der Erfindung zum Stand der Technik: Das Druckbild 20 in Figur 2B setzt sich aus einem ersten Teilbild 21 bzw. ersten oder geradzahligen Druckzeilen 25 (welche zuerst gedruckt werden) und aus einem zweiten Teilbild 22 bzw. zweiten oder ungeradzahligen Druckzeilen 26 zusammen (welche anschließend zwischen die ersten Zeilen gedruckt werden). Wieder ist vereinfachend nur ein Druckbild aus einer Buntfarbe dargestellt.A comparison between the Figures 2A and 2B shows the difference between the invention and the prior art: the print image 20 in Figure 2B is composed of a first partial image 21 or first or even-numbered print lines 25 (which are printed first) and a second partial image 22 or second or odd-numbered print lines 26 (which are subsequently printed between the first lines). Again, only one printed image from one color is shown for simplicity.

Figur 2C zeigt, dass anstelle der in Figur 2B gezeigten Zeilen das erste Druckbild 21 auch eine erste schachbrettartige Hälfte 27 und das zweite Druckbild 22 eine bevorzugt komplementäre, zweite schachbrettartige Hälfte 28 des Druckbilds 20 sein können. Figure 2C shows that instead of the in Figure 2B lines shown, the first printed image 21 can also be a first checkerboard-like half 27 and the second printed image 22 can be a preferably complementary, second checkered-like half 28 of the printed image 20.

Die ersten Druckzeilen 25 in Figur 2B und die erste schachbrettartige Hälfte 27 in Figur 2C werden dabei von einem ersten Druckkopf einer Buntfarbe gedruckt. Die zweiten Druckzeilen 26 in Figur 2B und die zweite schachbrettartige Hälfte 28 in Figur 2C werden von einem zweiten Druckkopf derselben Buntfarbe bedruckt. Handelt es sich bei den beiden Druckbildern in Figur 2B und 2C beispielsweise um cyanfarbige Druckbilder, so wären die beiden Druckköpfe in der Konfiguration A die Druckköpfe 2A der Druckstation 2 und die Druckköpfe 5A der Druckstation 5. Entsprechendes gilt für die verbleibenden Buntfarben.The first print lines 25 in Figure 2B and the first checkerboard half 27 in Figure 2C are printed by a first printhead of a chromatic color. The second print lines 26 in Figure 2B and the second checkerboard half 28 in Figure 2C are printed by a second print head of the same color. Are the two printed images in Figure 2B and 2C For example, for cyan-colored print images, the two print heads in configuration A would be print heads 2A of print station 2 and print heads 5A of print station 5. The same applies to the remaining chromatic colors.

In der Figur 2D ist der zeilenweise Aufbau eines dritten Teilbildes 23 des Druckbilds 20 für den Schwarzanteil bzw. den Unbuntanteil gezeigt. Dieser wird im Beispiel auf der linken Seite der Figur 2D mit nur einem Druckkopf erzeugt. Am Beispiel der Konfiguration A wäre dies der Druckkopf 1A der Druckstation 1. Ein Vergleich der linken Seite der Figur 2D und der jeweiligen rechten Seite der Figuren 2B und 2C zeigt, dass der Schwarzanteil bzw. Unbuntanteil des Druckbilds 20 eine geringere Druckauflösung besitzt als der Buntanteil (beispielhaft die halbe Druckauflösung). Es kann daher auch, wie auf der rechten Seite der Figur 2D dargestellt, vorgesehen sein, eine achte Druckstation 8 mit einem achten Druckkopf 8A vorzusehen. Mit dieser Druckstation kann ein zum dritten Teilbild 23 komplementäres viertes Teilbild 24 erzeugt werden.In the Figure 2D the line-by-line structure of a third partial image 23 of the printed image 20 for the black component or the achromatic component is shown. This is shown on the left in the example Figure 2D generated with only one printhead. Using configuration A as an example, this would be print head 1A of print station 1. A comparison of the left side of the Figure 2D and the respective right side of the Figures 2B and 2C shows that the black portion or achromatic portion of the printed image 20 has a lower print resolution than the colored portion (for example half the print resolution). It can therefore, as on the right side of the Figure 2D shown, be provided to provide an eighth print station 8 with an eighth print head 8A. With this printing station, a fourth partial image 24 complementary to the third partial image 23 can be generated.

Figur 3 zeigt eine Einrichtung für den Tintenwechsel 30. Eine solche Einrichtung kann einer einzelnen Druckstation 1 bis 8 zugeordnet sein. Die Einrichtung umfasst ein Versorgungsmodul 31a für erste Tinte, ein Versorgungsmodul31b für zweite Tinte und ein Versorgungsmodul 31c für Reinigungsflüssigkeit. Die Tinten durchfließt einen Druckkopf 32 bzw. dessen vorgeordnetes Leitungssystem 33 und nachgeordnetes Leitungssystem 34 (so genannte Manifolds). Das Versorgungsmodul 31a (und auch das Versorgungsmodul 31b in entsprechender Weise) weist eine Pumpe 36a, eine Pumpe 36b, einen Tank 37, einen Degaser 38 und einen Filter 39 auf. Die Tinte fließt von dem Versorgungsmodul über einen Umschalter 35a zum Druckkopf und von dort über einen Umschalter 35b zurück zum Versorgungsmodul. Die Umschalter können z. B. als Umschalt-Ventile ausgeführt sein. Mittels der Umschalter kann zwischen den Versorgungsmodulen 31a und 31b für Tinte gewechselt werden. Somit ist es z. B. möglich, zwischen den in Figur 1 gezeigten verschiedenen Konfigurationen A bis F zu wechseln bzw. einen entsprechenden Tintenwechsel an betroffenen Druckstationen 1 bis 8 durchzuführen. Eine Einrichtung für den Tintenwechsel 30 braucht dabei nur an solchen Druckstationen 1 bis 8 vorgesehen sein, an welcher tatsächlich auch ein Tintenwechsel erfolgt. Die erste Druckstation 1, welche in allen Konfigurationen schwarze Tinte verdruckt, braucht z. B. keine solche Einrichtung 30 aufzuweisen. Mittels der Umschalter kann anstelle zweier verschiedener Tinten auch eine Reinigungsflüssigkeit durch die Leitungen und den Druckkopf geführt werden, um eine Reinigung vor dem Einbringen neuer Tinte durchzuführen. Figure 3 shows a device for ink change 30. Such a device can be assigned to a single printing station 1 to 8. The device comprises a supply module 31a for first ink, a supply module 31b for second ink and a supply module 31c for cleaning liquid. The inks flow through a print head 32 or its upstream line system 33 and downstream line system 34 (so-called manifolds). The supply module 31a (and also the supply module 31b in a corresponding manner) has a pump 36a, a pump 36b, a tank 37, a degaser 38 and a filter 39. The ink flows from the supply module via a switch 35a to the print head and from there via a switch 35b back to the supply module. The switch can e.g. B. be designed as changeover valves. The changeover switch can be used to switch between the supply modules 31a and 31b for ink. Thus, it is e.g. B. possible between the in Figure 1 shown to change different configurations A to F or to perform a corresponding ink change at the affected printing stations 1 to 8. A device for the ink change 30 need only be provided at those printing stations 1 to 8 at which an ink change actually takes place. The first printing station 1, which prints black ink in all configurations, needs e.g. B. have no such device 30. Instead of two different inks, the changeover switch can also be used to pass a cleaning liquid through the lines and the printhead in order to carry out cleaning before the introduction of new ink.

Figur 4 zeigt einen Farbraum 40 bzw. das bekannte CIE-Farbendreieck mit zwei Achsen 41. In der Darstellung sind die Farborte der Farben C, M, Y, O, G, V und auch der Farben F1 bis F6 dargestellt. Für Letztere wurden lediglich beispielshafte Farborte ausgewählt. Jedenfalls liegen die Buntfarben des ersten Farbsystems F1 bis F3 und die Buntfarben des zweiten Farbsystems F4 bis F6 jeweils in den durch die gestrichelt dargestellten Linien abgegrenzten Bereichen. Figure 4 shows a color space 40 or the known CIE color triangle with two axes 41. The color locations of the colors C, M, Y, O, G, V and also the colors F1 to F6 are shown in the illustration. Only exemplary color locations were selected for the latter. In any case, the chromatic colors of the first color system F1 to F3 and the chromatic colors of the second color system F4 to F6 each lie in the areas delimited by the dashed lines.

BezugszeichenlisteReference list

11
erste Druckstationfirst printing station
1a1a
erster Druckkopffirst print head
22nd
zweite Druckstationsecond printing station
2a2a
zweiter Druckkopfsecond printhead
33rd
dritte Druckstationthird printing station
3a3a
dritter Druckkopfthird printhead
44th
vierte Druckstationfourth printing station
4a4a
vierter Druckkopffourth printhead
55
fünfte Druckstationfifth printing station
5a5a
fünfter Druckkopffifth printhead
66
sechste Druckstationsixth printing station
6a6a
sechster Druckkopfsixth printhead
77
siebte Druckstationseventh printing station
7a7a
siebter Druckkopfseventh printhead
88th
achte Druckstationeighth printing station
8a8a
achter Druckkopfeighth printhead
1010th
DruckmaschinePrinting press
1111
BedruckstoffSubstrate
1212th
TransportrichtungDirection of transport
1313
AnlegerInvestors
1414
Precoat-WerkPrecoat plant
1515
Inkjet-DruckwerkInkjet printing unit
1616
Zylindercylinder
16'16 '
Motorengine
1717th
LackwerkCoating unit
1818th
Trocknerdryer
1919th
Auslegerboom
2020th
DruckbildPrinted image
20'20 '
DruckzeilenPrinting lines
2121
erstes Teilbildfirst drawing file
2222
zweites Teilbildsecond drawing file
2323
drittes Teilbildthird drawing file
2424th
viertes Teilbildfourth drawing file
2525th
erste bzw. geradzahlige Druckzeilenfirst or even numbered print lines
2626
zweite bzw. ungeradzahlige Druckzeilensecond or odd-numbered print lines
2727
erste schachbrettartige Hälftefirst checkerboard half
2828
zweite schachbrettartige Hälftesecond checkerboard half
3030th
Einrichtung für den TintenwechselInk change facility
31a31a
Versorgungsmodul für erste TineSupply module for the first tine
31b31b
Versorgungsmodul für zweite TinteSecond ink supply module
31c31c
Versorgungsmodul für ReinigungsflüssigkeitSupply module for cleaning liquid
3232
DruckkopfPrinthead
3333
vorgeordnetes Leitungssystemupstream pipe system
3434
nachgeordnetes Leitungssystemsubordinate pipe system
35a35a
Umschalterswitch
35b35b
Umschalterswitch
36a36a
Pumpepump
36b36b
Pumpepump
3737
Tanktank
3838
DegaserDegaser
3939
Filterfilter
4040
FarbraumColor space
4141
Achsenaxes
A bis GA to G
KonfigurationenConfigurations
C, M, YC, M, Y
Buntfarben eines ersten Farbsystems (Cyan, Magenta, Gelb)Bright colors of a first color system (cyan, magenta, yellow)
O, G, VO, G, V
Buntfarben eines zweiten Farbsystems (Orange, Grün, Violett)Bright colors of a second color system (orange, green, violet)
F1, F2, F3F1, F2, F3
Buntfarben eines ersten FarbsystemsBright colors of a first color system
F4, F5, F6F4, F5, F6
Buntfarben eines zweiten FarbsystemsBright colors of a second color system

Claims (4)

  1. Method for operating a multicolor ink printing machine having a minimum of seven printing stations wherein printing heads (1a to 8a) of the printing stations (1 to 7) print a printed image (20) of a minimum of four colours at a print resolution defined in a direction (12) of transport for the coloured portion of the printed image onto a printing material (11) transported in the direction (12) of transport, wherein to print a four-colour printed image, three printing stations print a first image portion (21) of the printed image using coloured inks of a first colour system and printing at half the defined print resolution and wherein three further printing stations print a second image portion (22) of the printed image, said second image portion (22) complementary to the first image portion and printed using coloured inks of a second colour system that is the same as the first colour system and printed at half of the defined print resolution and in such a way that the first and second image portions complement one another to form the coloured portion of the printed image at the defined print resolution and wherein at least one further printing station prints a third image portion (23) of the printed image using black ink and printing at half the defined print resolution,
    wherein the first colour system comprises the following coloured inks:
    - C (cyan), M (magenta), and Y (yellow) or
    - O (orange), G (green), and V (violet),
    and the second colour system comprises the following coloured inks
    - C (cyan), M (magenta), and Y (yellow) or
    - O (orange), G (green), and V (violet),
    wherein the printing stations are arranged to succeed one another in one of the following configurations (A, B, C, D, E, F)
    - K C M Y C M Y (A) or
    - KCMYYMC (B)or
    - K C M Y O G V (C) or
    - K C C M M Y Y (E),
    wherein an ink change occurs between two print jobs, wherein the configuration of the printing stations changes as follows:
    - from K C M Y C M Y (A) to K C M Y O G V (C) or vice versa (C, A) or
    - from K C M Y Y M C (B) to K C M Y O G V (C) or vice versa (C, B) or
    - from K C C M M Y Y (E) to K C M Y O G V (C) or vice versa (C, E), wherein in the K C M Y O G V configuration, a seven-colour printed image (20) is printed at half the print resolution and wherein a switch is made from a first mode for producing seven-colour printed products in the K C M Y O G V configuration at a maximum first production speed v1 to a second mode for producing four-coloured printed products in one of the K C M Y C M Y, K C M Y Y M C, or K C C M M Y Y configurations at a maximum second production speed v2 or vice versa, wherein
    v2 = 2∗v1.
  2. Method according to claim 1,
    characterized
    in that the coloured portion of the printed image (20) is built up of successive print rows (25, 26) in the direction of transport (12) and in that the first image portion (21) comprises all even-numbered rows (25) of the coloured portion of the printed image and the second image portion (22) comprises all uneven-numbered rows of the coloured portion of the printed image.
  3. Method according to claim 1,
    characterized
    in that the coloured proportion of the printed image (20) is built up in a chequerboard-like way (27, 28) and in that the first image portion (21) comprises a first chequerboard-like half (27) of the coloured portion of the printed image and the second image portion (22) comprises a second chequerboard-like half (28) of the coloured portion of the printed image, said second half (28) complementary to said first half (27).
  4. Method according to any one of the preceding claims,
    characterized
    in that every printing station at which an ink change is made comprises a supply module (31a) for a first ink, a supply module (31b) for a second ink, and a supply module (31c) for a first cleaning liquid and in that a cleaning operation switching between the supply modules is implemented between printing with the first ink and printing with the second ink.
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DE102016221745A1 (en) 2018-05-09
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CN108068466B (en) 2021-02-05

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