EP3463890A1 - Flexographic printing press - Google Patents

Flexographic printing press

Info

Publication number
EP3463890A1
EP3463890A1 EP17729056.6A EP17729056A EP3463890A1 EP 3463890 A1 EP3463890 A1 EP 3463890A1 EP 17729056 A EP17729056 A EP 17729056A EP 3463890 A1 EP3463890 A1 EP 3463890A1
Authority
EP
European Patent Office
Prior art keywords
register
printing
image
central cylinder
flexographic printing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP17729056.6A
Other languages
German (de)
French (fr)
Inventor
Martin Krümpelmann
Frank Gunschera
Dietmar Pötter
Jürgen VUTZ
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.)
Windmoeller and Hoelscher KG
Original Assignee
Windmoeller and Hoelscher KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Windmoeller and Hoelscher KG filed Critical Windmoeller and Hoelscher KG
Publication of EP3463890A1 publication Critical patent/EP3463890A1/en
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F5/00—Rotary letterpress machines
    • B41F5/24—Rotary letterpress machines for flexographic printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/08—Cylinders
    • B41F13/10—Forme cylinders
    • B41F13/12—Registering devices
    • B41F13/14—Registering devices with means for displacing the cylinders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/0081—Devices for scanning register marks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F5/00—Rotary letterpress machines
    • B41F5/04—Rotary letterpress machines for printing on webs
    • B41F5/16—Rotary letterpress machines for printing on webs for multicolour printing
    • B41F5/18—Rotary letterpress machines for printing on webs for multicolour printing using one impression cylinder co-operating with several forme cylinders
    • 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
    • B41P2233/13—Pre-registering

Definitions

  • the invention relates to a flexographic printing machine and to a corresponding method for printing an image on a material web with a central cylinder and a plurality of inking units arranged around the central cylinder, in each of which printing ink can be transferred from a pressure roller to the material web.
  • the invention relates to a central cylinder flexographic printing machine, as it is known from WO 201 1/058074 A1.
  • Such flexographic printing machines have a central cylinder around which the individual inking units are arranged in satellite construction. The printing material is guided past the individual inking units during the entire printing process on the central cylinder.
  • the central cylinder is operated with a high concentricity (with a steel cylinder of 1.80 m diameter, the concentricity is for example a few microns), so that the
  • Pressure cylinder shafts secured with interceptors to ensure vibration-free operation.
  • pressure cylinder shafts mounted on both sides.
  • the sleeve itself consists of a thin-walled sleeve, to which the flexible printing plates (also called cliché) are glued.
  • the printing plates are made of rubber or photopolymer, with their hardness and thickness depends on the particular substrate.
  • Register mark field which is glued in register in the form of an adhesive tape on the sleeve.
  • the object of the invention is therefore to provide a flexographic printing machine, which allows optimized under economic aspects determination and adjustment of the register data.
  • FIG. 1 is a schematic overall view of the invention
  • Fig. 2 is a schematic detail view of a printed test pattern.
  • Fig. 1 shows a schematic overall view of the invention
  • Flexographic printing machine 101 with a camera 102, a database 103 and a control unit 104.
  • the flexographic printing machine 101 is a so-called central cylinder machine and accordingly has a central cylinder 105 around which the eight inking units are arranged in a star shape.
  • Each of these inking units has a pressure roller, an anilox roller and a doctoring chamber, each on the machine side
  • Anchorages are mounted.
  • the inking unit 106 is designated by way of example.
  • Pressure roller 1 10 out.
  • the pressure roller 1 10 applies the material web 107 for further transport to the central cylinder 105, so that the material web 107 register accurate to the inking units and not shown
  • a database 103 is provided on which the PDF data of the respective printing cylinders are stored.
  • PDF is the abbreviation for Portable Document Format (short PDF; German: (trans) portable document format) is a common name for a platform-independent file format for
  • test image is printed before starting the actual print job for automatic register correction.
  • the test image corresponds to the image to be printed on the material web, however, initially only a single image is printed in order to minimize waste, which is referred to in this context as a test image.
  • Fig. 2 shows a schematic detail view of such a printed test pattern.
  • the test pattern consists of a color-printed letter "A", the color impression being obtained by three colors printed one above the other. Since the inking units are not yet set register-accurate to each other, the test image appears as shown in Fig. 2 with the corresponding register errors.
  • test image is transmitted from the camera 102 via the interface 104 to the control unit 104 and is there via the pattern recognition via the
  • Interface 1 15 compared with the PDF data of the database 103. Due to this comparison, the control unit 104 is able to calculate the register correction data for the page register and the longitudinal register with respect to each inking unit and pass it via the interface 1 16 to the individual inking units of the flexographic printing press.

Abstract

The invention relates to a flexographic printing press (101) for printing an image onto a material web (107) having a central cylinder (105) and a plurality of inking units (106) which are arranged around the central cylinder (105) and in which printing ink can be transferred from a printing roll onto the material web in each case. In order to provide a flexographic printing press which makes it possible to determine and set the register data in a manner which is optimized under economic aspects, a printed test image is detected by way of a detection unit (102). In a computing unit (104), the test image is compared with a stored setpoint image (103), and the register correction data of the printing rolls in the respective inking units (106) are calculated in a manner which is dependent on the comparison. The register correction data are then transferred to the printing rolls, in order to achieve an in-register print.

Description

Flexodruckmaschine  flexographic printing
Die Erfindung betrifft eine Flexodruckmaschine sowie ein entsprechendes Verfahren zum Drucken eines Bildes auf eine Materialbahn mit einem Zentralzylinder und mehreren um den Zentralzylinder herum angeordneten Farbwerken, in denen jeweils Druckfarbe von einer Druckwalze auf die Materialbahn übertragbar ist. Vorzugsweise betrifft die Erfindung eine Zentralzylinder-Flexodruckmaschine, wie diese aus der WO 201 1/058074 A1 bekannt ist. Derartige Flexodruckmaschinen weisen einen Zentralzylinder auf, um den herum die einzelnen Farbwerke in Satellitenbauweise angeordnet sind. Der Bedruckstoff wird während des gesamten Druckvorgangs auf dem Zentralzylinder anliegend an den einzelnen Farbwerken vorbeigeführt. Dabei wird der Zentralzylinder mit einer hohen Rundlaufgenauigkeit betrieben (bei einem Stahlzylinder von 1 ,80 m Durchmesser beträgt die Rundlaufgenauigkeit beispielsweise wenige Mikrometer), sodass dieThe invention relates to a flexographic printing machine and to a corresponding method for printing an image on a material web with a central cylinder and a plurality of inking units arranged around the central cylinder, in each of which printing ink can be transferred from a pressure roller to the material web. Preferably, the invention relates to a central cylinder flexographic printing machine, as it is known from WO 201 1/058074 A1. Such flexographic printing machines have a central cylinder around which the individual inking units are arranged in satellite construction. The printing material is guided past the individual inking units during the entire printing process on the central cylinder. Here, the central cylinder is operated with a high concentricity (with a steel cylinder of 1.80 m diameter, the concentricity is for example a few microns), so that the
Registerlage des auf dem Zentralzylinder anliegenden Bedruckstoffs konstant bleibt. Auf diese Weise können insbesondere auch dehnbare Kunststofffolien mit einer hohen Druckqualität bedruckt werden. Vor jedem neuen Druckvorgang ist es bei derartigen Zentralzylinder-Register position of the voltage applied to the central cylinder substrate remains constant. In this way, in particular stretchable plastic films can be printed with a high print quality. Before any new printing, such central cylinder
Flexodruckmaschinen allerdings einmalig erforderlich, die einzelnen Druckzylinder registergenau am Zentralzylinder zu positionieren. Als sogenannte Registerdaten sind dabei das Seitenregister und das Längsregister des betreffenden Druckzylinders zu berücksichtigen. However, flexographic presses once required to position the individual printing cylinders in register with the central cylinder. As so-called register data while the page register and the longitudinal register of the relevant printing cylinder are taken into account.
Für Anwendungen, in denen es zu häufigen Auftragswechseln kommt, hat sich die sogenannte Sleeve-Technologie in Verbindung mit einendig gelagerten Druckzylinderwellen durchgesetzt. Bei einem Auftragswechsel werden nur die For applications where frequent job changes occur, so-called sleeve technology has been associated with single-ended Pressure cylinder waves enforced. For a job change, only the
Sleeves ausgetauscht, während die einendig gelagerten Druckzylinderwellen in der Maschine verbleiben. Im Druckbetrieb werden die freien Enden der Sleeves exchanged, while the single-ended pressure cylinder shafts remain in the machine. In printing operation, the free ends of the
Druckzylinderwellen mit Abfanglagern gesichert, um einen schwingungsfreien Betrieb zu gewährleisten. Für größere Druckbreiten gibt es zudem auch Ausführungen mit beidseitig gelagerten Druckzylinderwellen. Pressure cylinder shafts secured with interceptors to ensure vibration-free operation. For larger print widths, there are also versions with pressure cylinder shafts mounted on both sides.
Der Sleeve selber besteht aus einer dünnwandigen Hülse, auf die die flexiblen Druckformen (auch Klischee genannt) aufgeklebt sind. Die Druckformen werden aus Gummi oder Fotopolymeren hergestellt, wobei sich deren Härte und Dicke nach dem jeweiligen Bedruckstoff richtet. The sleeve itself consists of a thin-walled sleeve, to which the flexible printing plates (also called cliché) are glued. The printing plates are made of rubber or photopolymer, with their hardness and thickness depends on the particular substrate.
Es sind verschiedene Ansätze bekannt, um den Prozess der Justierung der There are various approaches known to the process of adjusting the
Registerdaten bei möglichst wenig Makulatur zu beschleunigen und zu Register data with as little waste as possible and accelerate
automatisieren. Beispielsweise wird in der oben erwähnten WO 201 1/058074 A1 als Lösung vorgeschlagen, jeden Sleeve in einem externen Mounter mit einem automate. For example, in the above-mentioned WO 201 1/058074 A1, it is proposed as a solution, each sleeve in an external mounter with a
Registermarkenfeld zu versehen, das in Form eines Klebestreifens registergenau auf den Sleeve geklebt wird. Dieser Ansatz liefert hinsichtlich der technischen Register mark field, which is glued in register in the form of an adhesive tape on the sleeve. This approach provides in terms of technical
Realisierung sehr gute Ergebnisse. Allerdings ist im Flexodruck die Tendenz zu beobachten, dass die einzelnen Druckaufträge immer kürzer werden, sodass dieRealization very good results. However, in flexographic printing there is a tendency to see individual print jobs getting shorter and shorter
Rüstzeiten der Druckmaschine inzwischen einen erheblichen Kostenfaktor darstellen. Es wird daher versucht, die mit dem Rüsten der Druckmaschine verbundenen Set-up times of the printing press now represent a significant cost factor. It is therefore attempted to connect with the equipping of the printing press
Arbeiten auf ein Minimum zu reduzieren. Aufgabe der Erfindung ist es daher, eine Flexodruckmaschine zu schaffen, die eine unter wirtschaftlichen Gesichtspunkten optimierte Bestimmung und Einstellung der Registerdaten ermöglicht. To reduce work to a minimum. The object of the invention is therefore to provide a flexographic printing machine, which allows optimized under economic aspects determination and adjustment of the register data.
Diese Aufgabe wird durch die Merkmale der Patentansprüche 1 und 4 gelöst. This object is solved by the features of claims 1 and 4.
Bevorzugte Ausführungsformen ergeben sich aus den Unteransprüchen. Weitere Einzelheiten und Vorteile der Erfindung werden anhand der beigefügten Preferred embodiments will be apparent from the dependent claims. Further details and advantages of the invention will become apparent from the attached
Zeichnungen beschrieben. In diesen zeigen: Fig. 1 eine schematische Gesamtansicht der erfindungsgemäßenDrawings described. In these show: Fig. 1 is a schematic overall view of the invention
Flexodruckmaschine und Flexographic printing machine and
Fig. 2 eine schematische Detailansicht eines gedruckten Testbildes. Fig. 1 zeigt eine schematische Gesamtansicht der erfindungsgemäßen Fig. 2 is a schematic detail view of a printed test pattern. Fig. 1 shows a schematic overall view of the invention
Flexodruckmaschine 101 mit einer Kamera 102, einer Datenbank 103 und einer Steuereinheit 104.  Flexographic printing machine 101 with a camera 102, a database 103 and a control unit 104.
Die Flexodruckmaschine 101 ist eine sogenannte Zentralzylindermaschine und weist demgemäß einen Zentralzylinder 105 auf, um den herum die acht Farbwerke sternförmig angeordnet sind. Jedes dieser Farbwerke weist eine Druckwalze, eine Rasterwalze und eine Rakelkammer auf, die jeweils an maschinenseitigen The flexographic printing machine 101 is a so-called central cylinder machine and accordingly has a central cylinder 105 around which the eight inking units are arranged in a star shape. Each of these inking units has a pressure roller, an anilox roller and a doctoring chamber, each on the machine side
Verankerungen montiert sind. Von diesen acht Farbwerken mit den beschriebenen Komponenten ist das Farbwerk 106 exemplarisch bezeichnet. Anchorages are mounted. Of these eight inking units with the described components, the inking unit 106 is designated by way of example.
Um die Materialbahn 107 zu bedrucken, wird diese in der Abwickel Station 108 von der Material rolle 109 abgezogen und über mehrere Umlenkwalzen an die In order to print the material web 107, it is withdrawn in the unwinding station 108 of the material roll 109 and a plurality of guide rollers to the
Anpresswalze 1 10 geführt. Die Anpresswalze 1 10 legt die Materialbahn 107 zum Weitertransport an den Zentralzylinder 105 an, sodass die Materialbahn 107 registergenau an den Farbwerken und den nicht näher dargestellten Pressure roller 1 10 out. The pressure roller 1 10 applies the material web 107 for further transport to the central cylinder 105, so that the material web 107 register accurate to the inking units and not shown
Zwischenfarbwerkstrocknern vorbeigeführt wird. Passed between the inking unit driers.
Nachdem die Materialbahn 107 den Zentralzylinder 105 verlassen hat, wird diese zum Abtrocknen der Druckfarbe durch einen Brückentrockner 1 1 1 geführt und dann in der Aufwickelstation 1 12 auf die Materialrolle 1 13 aufgewickelt. After the material web 107 has left the central cylinder 105, this is led to the drying of the ink by a bridge dryer 1 1 1 and then wound in the winding station 1 12 on the roll of material 1 13.
Erfindungsgemäß ist eine Datenbank 103 vorgesehen, auf der die PDF-Daten der jeweiligen Druckzylinder gespeichert sind. PDF ist die Abkürzung für Portable Document Format (kurz PDF; deutsch: (trans)portables Dokumentenformat) stellt eine gebräuchliche Bezeichnung für ein plattformunabhängiges Dateiformat fürAccording to the invention, a database 103 is provided on which the PDF data of the respective printing cylinders are stored. PDF is the abbreviation for Portable Document Format (short PDF; German: (trans) portable document format) is a common name for a platform-independent file format for
Dokumente dar, das ursprünglich vom Unternehmen Adobe Systems entwickelt und 1993 veröffentlicht wurde. Nachdem die Druckmaschine mit den einzelnen Drucksleeves bestückt wurde, wird vor dem Starten des eigentlichen Druckauftrags zur Automatischen Registerkorrektur ein Testbild gedruckt. Das Testbild entspricht grundsätzlich dem auf die Materialbahn zu druckenden Bild, allerdings wird zur Minimierung der Makulatur zunächst nur ein einzelnes Bild gedruckt, was in diesem Zusammenhang als Testbild bezeichnet wird. Fig. 2 zeigt eine schematische Detailansicht eines derartig gedruckten Testbildes. Der Einfachheit und ohne Beschränkung der Allgemeinheit sei hierbei angenommen, dass das Testbild aus einem farbig gedruckten Buchstaben "A" besteht, wobei der Farbeindruck durch drei übereinander gedruckte Farben gewonnen wird. Da die Farbwerke noch nicht registergenau zueinander eingestellt sind, erscheint das Testbild wie in Fig. 2 dargestellt mit den entsprechenden Registerfehlern. Documents originally developed by Adobe Systems and published in 1993. After the print engine has been loaded with the individual print sleeves, a test image is printed before starting the actual print job for automatic register correction. In principle, the test image corresponds to the image to be printed on the material web, however, initially only a single image is printed in order to minimize waste, which is referred to in this context as a test image. Fig. 2 shows a schematic detail view of such a printed test pattern. For the sake of simplicity and without restriction of generality, it is assumed here that the test pattern consists of a color-printed letter "A", the color impression being obtained by three colors printed one above the other. Since the inking units are not yet set register-accurate to each other, the test image appears as shown in Fig. 2 with the corresponding register errors.
Das Testbild wird von der Kamera 102 über die Schnittstelle 104 zur Steuereinheit 104 übertragen und wird dort auf dem Wege der Mustererkennung über die The test image is transmitted from the camera 102 via the interface 104 to the control unit 104 and is there via the pattern recognition via the
Schnittstelle 1 15 mit den PDF-Daten der Datenbank 103 verglichen. Aufgrund dieses Vergleichs ist die Steuereinheit 104 in der Lage, die Registerkorrekturdaten für das Seitenregister und das Längsregister mit Bezug auf jedes Farbwerk zu berechnen und über die Schnittstelle 1 16 an die einzelnen Farbwerke der Flexodruckmaschine weiterzugeben. Interface 1 15 compared with the PDF data of the database 103. Due to this comparison, the control unit 104 is able to calculate the register correction data for the page register and the longitudinal register with respect to each inking unit and pass it via the interface 1 16 to the individual inking units of the flexographic printing press.

Claims

Patentansprüche claims
Flexodruckmaschine zum Drucken eines Bildes auf eine Material bahn, mit einem Zentralzylinder und mehreren um den Zentralzylinder herum angeordneten Farbwerken, in denen jeweils Druckfarbe von einer Druckwalze auf die Materialbahn übertragbar ist, mit einer Erfassungseinheit zur Erfassung eines gedruckten Testbildes, mit einer Recheneinheit, in der das Testbild mit einem abgespeicherten Soll- Bild verglichen wird und in Abhängigkeit von dem Vergleich die A flexographic printing machine for printing an image on a material web, comprising a central cylinder and a plurality of inking units arranged around the central cylinder, in each of which printing ink can be transferred from a printing roller to the material web, with a detection unit for recording a printed test image, with a computing unit in which the test image is compared with a stored target image and, depending on the comparison, the
Registerkorrekturdaten der Druckwalzen in den jeweiligen Farbwerken berechnet werden, und mit einer Stelleinheit, die die Registerkorrekturdaten auf die Druckwalzen überträgt, um einen registergenauen Druck zu erreichen. Register correction data of the pressure rollers in the respective inking units are calculated, and with an actuator which transmits the register correction data on the pressure rollers to achieve a register-accurate pressure.
Flexodruckmaschine nach Anspruch 1 , wobei die Erfassungseinheit eine hochauflösende Kamera ist. A flexographic printing machine according to claim 1, wherein the detection unit is a high-resolution camera.
Flexodruckmaschine nach einem der Ansprüche 1 - 2, wobei die A flexographic printing machine according to any one of claims 1-2, wherein the
Registerkorrekturdaten das Seitenregister und das Längsregister umfassen. Register correction data comprising the page register and the longitudinal register.
Verfahren zum Drucken eines Bildes auf eine Materialbahn mit einer Method for printing an image on a web with a
Flexodruckmaschine, die einen Zentralzylinder und mehrere um den Flexographic printing machine, which has a central cylinder and several around the
Zentralzylinder herum angeordnete Farbwerke aufweist, in denen jeweils Druckfarbe von einer Druckwalze auf die Materialbahn übertragen wird, bei dem mit einer Erfassungseinheit ein gedrucktes Testbild erfasst wird, bei dem in einer Recheneinheit das Testbild mit einem abgespeicherten Soll- Bild verglichen wird und in Abhängigkeit von dem Vergleich die Registerkorrekturdaten der Druckwalzen in den jeweiligen Farbwerken berechnet werden, und bei dem die Registerkorrekturdaten auf die Druckwalzen übertragen werden, um einen registergenauen Druck zu erreichen. Central cylinder arranged around inking units, in each of which ink is transferred from a pressure roller on the web, in which a detection unit, a printed test image is detected, in which the test image is compared with a stored target image in a computing unit and in dependence Compare the Register correction data of the pressure rollers in the respective inking units are calculated, and in which the register correction data are transmitted to the pressure rollers in order to achieve a register-accurate pressure.
EP17729056.6A 2016-05-31 2017-05-31 Flexographic printing press Pending EP3463890A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP16172345.7A EP3251849A1 (en) 2016-05-31 2016-05-31 Flexographic printing machine
PCT/EP2017/063230 WO2017207670A1 (en) 2016-05-31 2017-05-31 Flexographic printing press

Publications (1)

Publication Number Publication Date
EP3463890A1 true EP3463890A1 (en) 2019-04-10

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ID=56096559

Family Applications (2)

Application Number Title Priority Date Filing Date
EP16172345.7A Withdrawn EP3251849A1 (en) 2016-05-31 2016-05-31 Flexographic printing machine
EP17729056.6A Pending EP3463890A1 (en) 2016-05-31 2017-05-31 Flexographic printing press

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP16172345.7A Withdrawn EP3251849A1 (en) 2016-05-31 2016-05-31 Flexographic printing machine

Country Status (2)

Country Link
EP (2) EP3251849A1 (en)
WO (1) WO2017207670A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112721441B (en) * 2020-12-23 2022-05-06 江苏省高淳印刷股份有限公司 Printing quality detection device of printing machine

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005004972A1 (en) * 2005-02-03 2006-08-10 Windmöller & Hölscher Kg register process
EP1803565A1 (en) * 2005-12-27 2007-07-04 Fischer & Krecke GmbH & Co. KG Process of changing a printing group on a running rotary printing press
ES2300196B1 (en) * 2006-07-28 2009-02-01 Comexi, S.A. METHOD OF DETERMINATION OF PRINTED IMAGES REGARDING PRINTING GROUPS.
DE102009046566B4 (en) 2009-11-10 2017-06-01 Windmöller & Hölscher Kg Body with a register marker field
DE102012221195A1 (en) * 2012-11-20 2014-05-22 Bst International Gmbh Printing machine e.g. flexographic printing machine, has printing unit that is adjusted by control unit relative to printing cylinder, and monitor which is provided for reproducing stored print images

Also Published As

Publication number Publication date
WO2017207670A1 (en) 2017-12-07
EP3251849A1 (en) 2017-12-06

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