EP0509226A1 - Printing device - Google Patents

Printing device Download PDF

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Publication number
EP0509226A1
EP0509226A1 EP92103949A EP92103949A EP0509226A1 EP 0509226 A1 EP0509226 A1 EP 0509226A1 EP 92103949 A EP92103949 A EP 92103949A EP 92103949 A EP92103949 A EP 92103949A EP 0509226 A1 EP0509226 A1 EP 0509226A1
Authority
EP
European Patent Office
Prior art keywords
roller
printing device
ink
printing
divided
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.)
Withdrawn
Application number
EP92103949A
Other languages
German (de)
French (fr)
Inventor
Georg Dr. Dipl.-Chem. Bolte
Georg Dipl.-Ing. Niggemeier (Fh)
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.)
Karl H Sengewald GmbH and Co KG
Kobusch Folien GmbH and Co KG
Original Assignee
Karl H Sengewald GmbH and Co KG
Kobusch Folien GmbH and Co 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 Karl H Sengewald GmbH and Co KG, Kobusch Folien GmbH and Co KG filed Critical Karl H Sengewald GmbH and Co KG
Publication of EP0509226A1 publication Critical patent/EP0509226A1/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • B41F31/002—Heating or cooling of ink or ink rollers
    • 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
    • B41F13/22—Means for cooling or heating forme or impression cylinders

Definitions

  • the invention relates to a printing device of the type specified in the preamble of claim 1.
  • ink When printing on webs of paper, plastic film and the like. ink is transferred from an inking unit, which contains an ink tray and / or squeegee, to the web running over an impression cylinder.
  • the continuously moving material web is usually printed using the flexographic printing process or the gravure printing process.
  • UV-curing or ES-curing inks can be used which cure by means of ultraviolet radiation or electron beam treatment.
  • the advantage of such paints is that they can be cured quickly without the expulsion of excipients such as solvents from the paints applied to the film web.
  • solvent-based paints can also be used, but these generally have the disadvantage that solvents are in the environment evaporates into it and that changes in color take place after application.
  • Printing inks in particular UV or ES-curing printing inks, have a strong dependence of the viscosity on the temperature, without e.g. to change their consistency through loss of solvent.
  • Printing devices that process such printing inks require a very precise temperature setting so that the ink is applied with the desired amount of ink application.
  • the temperature of the liquid ink can only be changed across the entire width of the roller. It can happen that, due to different gap widths between two co-operating rollers or between a roller and a doctor blade, different layer thicknesses of the ink arise in different lengths of the web. In addition, there is often the situation that color should be applied in different width ranges of the material web to different layer thicknesses.
  • Different layer thicknesses can produce different colors in the individual areas, even with the same color. It is even sometimes desirable to use the same color to produce different hues at different locations on the web of material by applying the color in different layer thicknesses.
  • the previous temperature control systems which are used when using inks, the viscosity of which is strongly temperature-dependent, have an effect across the entire width of the material web or over the entire width of the impression cylinder or the inking unit.
  • the invention has for its object to provide a printing device that uses colors With temperature-dependent viscosity, targeted changes or measurements of the paint application quantities are possible.
  • the impression cylinder and / or the inking unit is divided in the axial direction into several thermal zones in which different temperatures can be set. This makes it possible to achieve different or uniform amounts of ink applied across the web width and to selectively influence the layer thickness of the paint application across the web width.
  • a uniform layer thickness of the paint to be applied can be achieved over the entire web width at those points which are to be inked, but locally different layer thicknesses can also be produced. If, for example, a large area is to be coated with paint in the left half of the web, the paint application can be kept thinner there than in the right half of the web, where only selective areas should be coated with paint.
  • the invention takes advantage of the temperature dependence of the viscosity of the color material to enable the printer to produce different or the same color tones at different locations on the web width. On the other hand, a very even application of paint over the web width is also possible, if necessary can be corrected by appropriate settings of the controllable heating or cooling devices.
  • the invention is advantageously applicable to such paints which can be hardened by ultraviolet radiation or by electron beam treatment.
  • the invention is only applicable if the solvent losses are not significantly affected by different temperature distributions.
  • the invention is particularly suitable for flexographic printing devices which carry out a letterpress printing and in which the cliché is raised on a printing roller which is inked by an anilox roller.
  • the invention can also be used in offset printing machines in which the cliché is present on a printing plate and the print image is transferred from this printing plate, which is colored by a transfer roller, to an impression cylinder.
  • the invention is also applicable to other printing processes, such as e.g. Screen printing, gravure printing etc.
  • gravure printing for example, the printing cylinder and / or doctor blade must be designed with an appropriate zone temperature control.
  • the zones with different temperatures can be set up wherever there is a color transfer and / or color division, either before or after the color division.
  • the zones with different temperatures can be attached either to the element that supplies the color or to one of the two elements that part of the color forwarded after the color division.
  • the temperature profiling system consisting of the thermal zones can be provided in connection with the ink tray, an immersion roller or a chamber doctor blade, the doctor blade, the anilox roller, the printing cylinder or the central cylinder.
  • the differentiated temperature control can take place at each of these points.
  • the temperature control system can be arranged inside a roller, which is divided into different chambers, or outside such a roller, whereby it acts on the circumference of the roller.
  • the element provided for the heat profiling with a basic heating which generates a uniform temperature over the entire width, and additionally to provide heat distribution devices which cool individual areas and heat other areas.
  • heat splitters are known as Peltier elements.
  • At least three separately controllable heating or cooling zones are preferably provided.
  • FIG. 1 shows a flexographic printing device in which the material web 10 to be printed rotates around an impression cylinder 11 and is thereby printed by a printing roller 12.
  • the printing roller 12 carries on its circumference a cliché made of elastomer material, which picks up ink from an anilox roller 13 at the raised points and transfers it to the material web 10.
  • the anilox roller 13 has on its circumference a grid of numerous depressions (cups) for receiving liquid ink. It serves as a transfer and metering roller for transferring the ink onto the cliché of the printing roller 12. On the circumference of the anilox roller 13, a doctor blade 14 engages, which extends over the entire width of the anilox roller and wipes off the excess ink from this anilox roller, before the remaining ink is transferred to the printing roller 12.
  • the printing ink is located in an ink pan 15 into which an immersion roller 16 is immersed.
  • an immersion roller 16 rotates, it transfers the ink layer adhering to its circumference to the anilox roller 13.
  • the ink tray 15 is divided into thermal zones Z1, Z2... Zn parallel to the axial direction of the inking unit 17 consisting of the rollers 12, 13 and 16 and the doctor blade 14.
  • Each of these zones is provided with its own temperature control device T1, T2 ... Tn, which can be controlled separately.
  • the zones Z1, Z2 ... Zn are separated from one another by partitions 18 in the interior of the ink pan 15. These partitions 18 do not need to cause complete separation of the zones, but they prevent liquid paint from flowing longitudinally in the paint tray. They cause ink material which is in one of the zones to remain in this zone even during the rotation of the immersion roller 16 and does not transfer a substantial proportion of the ink from one zone to other zones.
  • Tn can be controlled individually, ie independently of one another, and can be set from a control unit (not shown). It is also possible that the control device sets a common basic heating for all temperature control devices and that the individual adjustability is only effective above this basic heating. Another possibility is to operate the tempering devices all with the same heating energy and to make them displaceable on the tub 15, so that the heat transfer between each heating device and the tub is changed in the thermal zone in question. It is only important that the individual zones Z1, Z2 ... Zn can be tempered individually, so that in each of the Zones a different temperature can be set.
  • the printer When operating the printing device, the printer can first roughly set a desired temperature distribution in the individual zones. A test run then takes place. Here, ink is transferred from the ink pan 15 to the plunger roller 16. From here, the pressure fluid reaches the anilox roller 13, where it is partially stripped and metered by the doctor blade 14. The printing fluid remaining on the anilox roller 13 is transferred to the cliché of the printing roller 12 and from there to the substrate 10. All of the rollers 11, 12, 13 and 16 are driven in the indicated arrow directions. After the substrate has passed the pressure roller 12, a treatment device (not shown) acts on the substrate 10 in order to harden the ink applied in liquid form. This treatment device can be a UV irradiation device or an electron beam treatment device.
  • the printer After the printer has checked the printing result on the film web 10 in a test run, it can change the color distribution across the width of the film web 10 by appropriate adjustment of the temperature control devices. This changes the amount of ink applied to the plunger roller 16 in the individual zones. The temperature of the ink in the individual zones can also be changed without difficulty during operation of the printing device, since no intervention in the mechanics of the printing unit is required.
  • temperature control devices can be designed such that they are also suitable for cooling. This is particularly possible when a heat transfer fluid (liquid or gas) flows through the heating devices. Electrical heating or cooling devices are also possible.
  • FIG. 2 shows a roller 20, which can be the immersion roller 16, the anilox roller 13, the pressure roller 12 of the printing device shown in FIG. 1, or another roller of the inking unit.
  • the roller body 21 is divided in the axial direction of the roller 20 into a plurality of spaces or zones Z1, Z2... Zn thermally separated from one another by partition walls 22.
  • Each of these zones contains a temperature control device T1, T2 ... Tn, which can consist, for example, of a pipe coil or an electric heater.
  • the temperature control devices each have their own connecting lines which are led out through the hollow shaft 23 of the roller 20. By differently controlling the temperature control devices, the temperature profile of the roller 20 can thus be changed in a targeted manner over the width of the roller.
  • the heat or cold is transferred from the temperature control devices T1, T2 ...
  • Tn to the associated areas of the roll shell 21. These areas can be separated from one another by heat-insulating rings.
  • the film of ink liquid temporarily on the roller jacket 21 is heated to different extents in the individual zones Z1, Z2 ... Zn, so that different viscosities of the ink material result in the zones.
  • the different temperatures of the zones change the behavior of the color in these zones during transmission influenced by one roller to the next or when interacting with the doctor blade 14 (FIG. 1), a higher viscosity or a reduced degree of liquid, which can result in a lower thickness of the ink layer in the further transport path of the ink.
  • Fig. 3 shows a further embodiment of a roller 25, which can be heated differently over its axial length by temperature control devices T1, T2 ... Tn, so that the roller shell is divided into zones Z1, Z2 ... Zn.
  • the temperature control devices are inductive heating devices, each of which has an oscillating circuit comprising a coil 26 and a capacitor 27, which can be connected to a separately controllable AC power source 28.
  • the jacket of the roller 25 consists of magnetically conductive material and the coils 26 are arranged parallel to this jacket and at a short distance from it. When one of the coils 26 is excited, this coil generates a magnetic field which is concentrated in the corresponding zone of the roll shell.
  • the roller 25 can be one of the rollers shown in FIG. 1 or a doctor blade.
  • the temperature control devices T1, T2... Tn acting on the roll shell of the roll 26 are infrared radiators 27 which are individually and independently performance-controlled. These infrared radiators each radiate heat to one of the zones Z1, Z2 ... Zn of the roller shell 26 on which the ink layer is located. The zones are separated from one another by heat-insulating rings 27.
  • the doctor blade 14 cooperating with the anilox roller 13 is divided into thermally insulated zones Z1, Z2 ... Zn and each of these zones can be selectively heated by a temperature control device T1, T2 ... Tn.
  • the doctor blade 14 consists of a blade 19 which is divided into several zones Z1, Z2 ... Zn by intermediate walls 28 in the axial direction of the roller.
  • the partitions 28 are heat-insulating and prevent the change of color from one zone to an adjacent zone. These intermediate walls do not need to extend directly to the roller surface, but they can each form a narrow gap with the roller surface.
  • the temperature control devices T1, T2 ... Tn are heating elements which are attached to the blade 19 of the doctor blade 14 in the region of the individual zones and which are supplied electrically under the control of a control device 29.
  • the control device 29 has a separate actuator 30 for each heating element, on which the temperature of this temperature control element can be adjusted.
  • a control loop can be provided, which ensures that the temperature set on the actuator 30 is maintained exactly.
  • FIG. 6 shows a roller 32, which can be one of the rollers shown in FIG. 1.
  • This roller 32 is hollow and its interior is divided into zones Z1, Z2 ... Zn.
  • Zone Z1 contains a pipe coil 33 in which there is a heat transfer fluid. This coil is connected via a pipe 34 with a heat exchanger coil 35 to a closed first circuit 36.
  • a pipe coil 37 which is connected via a pipe 38 and a heat exchanger coil 39 to a closed second circuit 40, in which there is also a heat transfer fluid.
  • the heat exchanger coils 35 and 39 are in heat-conducting contact with a heat distribution device 41, which can be a Peltier element.
  • the heat distribution device 41 is connected via electrical lines 42 to a controllable current source 43 arranged outside the roller.
  • the heat distribution device 41 has the effect that, depending on the current supplied to it by the lines 42, it either extracts heat from the first circuit 36 and supplies this heat to the second circuit 40, or that it extracts heat from the second circuit 40 and this heat from the first Circulation 36 supplies. As a result, the circuit from which heat is extracted is cooled while the other circuit is heated.
  • the heat distribution device 41 does not generate any heat or cold per se, but, depending on the current intensity, extracts heat from one fluid circuit, which is supplied to the other fluid circuit. In both fluid circuits, the heat transfer fluid is in constant circulation by means of circulation pumps (not shown).
  • the coil 33 of the first circuit 36 in the zone Z1 is Roller 32 and the coil 37 of the second circuit 40 are arranged in the zone Z4. In the other zones there are also coils, which are assigned to other heat distribution devices.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)

Abstract

The printing device has a back pressure cylinder (11) and a forme inking unit (17). The back pressure cylinder and the forme inking unit (17) and/or the substrate are subdivided in the axial direction into a plurality of thermic zones (Z1, Z2 ... Zn) which can be heated or cooled independently of one another in order to vary the viscosity of the ink located in this zone. As a result, the quantity of ink can be influenced in terms of temperature beyond the printing width. The quantity of ink can be controlled in the axial direction during the running printing operation without mechanical changes to the machine. …<IMAGE>…

Description

Die Erfindung betrifft eine Druckvorrichtung der im Oberbegriff des Patentanspruchs 1 angegebenen Art.The invention relates to a printing device of the type specified in the preamble of claim 1.

Bei der Bedruckung von Bahnen aus Papier, Kunststoffolie u.dgl. wird Farbe von einem Farbauftragswerk, das eine Farbwanne und/oder Rakel enthält, auf die über einen Gegendruckzylinder laufende Bahn übertragen. Das Bedrucken der fortlaufend kontinuierlich bewegten Materialbahn erfolgt in der Regel im Flexodruckverfahren oder im Tiefdruckverfahren. Bei derartigen Druckverfahren können UV-härtende oder ES-härtende Farben eingesetzt werden, die durch ultraviolette Bestrahlung bzw. Elektronenstrahl-Behandlung härten. Der Vorteil solcher Farben besteht darin, daß eine schnelle Härtung ohne Austrieb von Trägerhilfsstoffen wie z.B. Lösemittel der auf die Folienbahn aufgetragenen Farben möglich ist. Alternativ können auch lösungsmittelhaltige Farben benutzt werden, die jedoch in der Regel den Nachteil haben, daß Lösungsmittel in die Umgebung hinein verdampft und daß nach dem Auftragen Farbenveränderungen stattfinden.When printing on webs of paper, plastic film and the like. ink is transferred from an inking unit, which contains an ink tray and / or squeegee, to the web running over an impression cylinder. The continuously moving material web is usually printed using the flexographic printing process or the gravure printing process. In such printing processes, UV-curing or ES-curing inks can be used which cure by means of ultraviolet radiation or electron beam treatment. The advantage of such paints is that they can be cured quickly without the expulsion of excipients such as solvents from the paints applied to the film web. Alternatively, solvent-based paints can also be used, but these generally have the disadvantage that solvents are in the environment evaporates into it and that changes in color take place after application.

Druckfarben, insbesondere UV- oder ES-härtende Druckfarben, haben eine starke Abhängigkeit der Viskosität von der Temperatur, ohne sich z.B. in ihrer Konsistenz durch Lösemittelverluste zu verändern. Druckvorrichtungen, die derartige Druckfarben verarbeiten, benötigen eine sehr genaue Temperatureinstellung, damit der Farbauftrag mit den jeweils gewünschten Farbauftragsmengen erfolgt. Eine Veränderung der Temperatur der flüssigen Farbe ist jeweils nur über die gesamte Walzenbreite möglich. Es kann vorkommen, daß aufgrund unterschiedlicher Spaltbreiten zwischen zwei zusammenwirkenden Walzen oder zwischen einer Walze und einer Rakel unterschiedliche Schichtstärken der Farbe in unterschiedlichen Längenbereichen der Bahn entstehen. Außerdem kommt häufig die Situation vor, daß Farbe in unterschiedlichen Breitenbereichen der Materialbahn zu unterschiedlichen Schichtdicken aufgetragen werden soll. Durch unterschiedliche Schichtdicken können selbst bei gleicher Farbe unterschiedliche Farbtöne in den einzelnen Bereichen entstehen. Es ist sogar manchmal erwünscht, unter Verwendung derselben Farbe unterschiedliche Farbtöne an verschiedenen Stellen der Materialbahn hervorzurufen, indem die Farbe in unterschiedlichen Schichtdicken aufgetragen wird. Die bisherigen Temperaturregelsysteme, die beim Einsatz von Farben benutzt werden, deren Viskosität stark temperaturabhängig ist, wirken sich über die gesamte Breite der Materialbahn bzw. über die gesamte Breite des Gegendruckzylinders oder des Farbauftragswerks aus.Printing inks, in particular UV or ES-curing printing inks, have a strong dependence of the viscosity on the temperature, without e.g. to change their consistency through loss of solvent. Printing devices that process such printing inks require a very precise temperature setting so that the ink is applied with the desired amount of ink application. The temperature of the liquid ink can only be changed across the entire width of the roller. It can happen that, due to different gap widths between two co-operating rollers or between a roller and a doctor blade, different layer thicknesses of the ink arise in different lengths of the web. In addition, there is often the situation that color should be applied in different width ranges of the material web to different layer thicknesses. Different layer thicknesses can produce different colors in the individual areas, even with the same color. It is even sometimes desirable to use the same color to produce different hues at different locations on the web of material by applying the color in different layer thicknesses. The previous temperature control systems, which are used when using inks, the viscosity of which is strongly temperature-dependent, have an effect across the entire width of the material web or over the entire width of the impression cylinder or the inking unit.

Der Erfindung liegt die Aufgabe zugrunde, eine Druckvorrichtung zu schaffen, die bei Verwendung von Farben mit temperaturabhängiger Viskosität gezielte Änderungen bzw. Bemessungen der Farbauftragsmengen ermöglicht.The invention has for its object to provide a printing device that uses colors With temperature-dependent viscosity, targeted changes or measurements of the paint application quantities are possible.

Die Lösung dieser Aufgabe erfolgt mit den im Patentanspruch 1 angegebenen Merkmalen.This object is achieved with the features specified in claim 1.

Bei der erfindungsgemäßen Druckvorrichtung ist der Gegendruckzylinder und/oder das Farbauftragswerk in axialer Richtung in mehrere thermische Zonen unterteilt, in denen unterschiedliche Temperaturen einstellbar sind. Dadurch ist es möglich, über die Bahnbreite hinweg unterschiedliche oder gleichmäßige Farbauftragsmengen zu erzielen und die Schichtstärke des Farbauftrags über die Bahnbreite hinweg selektiv zu beeinflussen. Mit der erfindungsgemäßen Druckvorrichtung kann entweder eine gleichmäßige Schichtstärke der aufzutragenden Farbe an denjenigen Stellen, die eingefärbt werden sollen, über die gesamte Bahnbreite erzielt werden, es können aber auch örtlich unterschiedliche Schichtstärken erzeugt werden. Wenn beispielsweise in der linken Bahnhälfte ein großflächiger Bereich mit Farbe beschichtet werden soll, kann dort der Farbauftrag dünner gehalten werden als in der rechten Bahnhälfte, wo nur selektive Stellen mit Farbe beschichtet werden sollen. Andererseits ist es auch möglich, unter Verwendung derselben Farbe durch unterschiedliche Farbauftragsmengen verschiedenartige Farbtöne an unterschiedlichen Stellen der Bahnbreite hervorzurufen.In the printing device according to the invention, the impression cylinder and / or the inking unit is divided in the axial direction into several thermal zones in which different temperatures can be set. This makes it possible to achieve different or uniform amounts of ink applied across the web width and to selectively influence the layer thickness of the paint application across the web width. With the printing device according to the invention, either a uniform layer thickness of the paint to be applied can be achieved over the entire web width at those points which are to be inked, but locally different layer thicknesses can also be produced. If, for example, a large area is to be coated with paint in the left half of the web, the paint application can be kept thinner there than in the right half of the web, where only selective areas should be coated with paint. On the other hand, it is also possible, using the same color, to produce different types of color tones at different points in the web width by applying different amounts of paint.

Die Erfindung macht sich die Temperaturabhängigkeit der Viskosität des Farbmaterials zunutze, um es dem Drucker zu ermöglichen, unterschiedliche oder gleiche Farbtöne an verschiedenen Stellen der Bahnbreite zu erzeugen. Andererseits ist auch ein sehr gleichmäßiger Farbauftrag über die Bahnbreite möglich, der erforderlichenfalls durch entsprechende Einstellungen der steuerbaren Heiz- oder Kühlvorrichtungen korrigiert werden kann.The invention takes advantage of the temperature dependence of the viscosity of the color material to enable the printer to produce different or the same color tones at different locations on the web width. On the other hand, a very even application of paint over the web width is also possible, if necessary can be corrected by appropriate settings of the controllable heating or cooling devices.

Die Erfindung ist mit Vorteil bei solchen Farben anwendbar, die durch Ultraviolett-Bestrahlung oder durch Elektronenstrahl-Behandlung härtbar sind. Für Druckvorrichtungen, die lösungsmittelhaltige Farben verwenden, ist die Erfindung nur dann anwendbar, wenn durch unterschiedliche Temperaturverteilungen die Lösungsmittelverluste nicht wesentlich beeinträchtigt werden.The invention is advantageously applicable to such paints which can be hardened by ultraviolet radiation or by electron beam treatment. For printing devices that use solvent-based inks, the invention is only applicable if the solvent losses are not significantly affected by different temperature distributions.

Die Erfindung ist insbesondere für Flexodruckvorrichtungen geeignet, die einen Hochdruck ausführen und bei denen das Klischee erhaben an einer Druckwalze vorhanden ist, welche von einer Rasterwalze eingefärbt wird. Die Erfindung ist jedoch auch bei Offset-Druckmaschinen anwendbar, bei denen das Klischee auf einer Druckplatte vorhanden ist und das Druckbild von dieser Druckplatte, die von einer Übertragungswalze eingefärbt wird, auf einen Gegendruckzylinder übertragen wird.The invention is particularly suitable for flexographic printing devices which carry out a letterpress printing and in which the cliché is raised on a printing roller which is inked by an anilox roller. However, the invention can also be used in offset printing machines in which the cliché is present on a printing plate and the print image is transferred from this printing plate, which is colored by a transfer roller, to an impression cylinder.

Ebenso anwendbar ist die Erfindung auch bei anderen Druckverfahren, wie z.B. Siebdruck, Tiefdruck etc. Beim Tiefdruck ist beispielsweise der Druckzylinder und/oder Rakel mit einer entsprechenden Zonentemperierung auszuführen.The invention is also applicable to other printing processes, such as e.g. Screen printing, gravure printing etc. For gravure printing, for example, the printing cylinder and / or doctor blade must be designed with an appropriate zone temperature control.

Die unterschiedlich temperierbaren Zonen können überall dort eingerichtet werden, wo eine Farbübertragung und/oder Farbteilung erfolgt, und zwar entweder vor oder nach der Farbteilung. Dabei können die unterschiedlich temperierbaren Zonen entweder an demjenigen Element angebracht sein, das die Farbe zuführt, oder an einem der beiden Elemente, das einen Teil der Farbe nach der Farbteilung weiterleitet.The zones with different temperatures can be set up wherever there is a color transfer and / or color division, either before or after the color division. The zones with different temperatures can be attached either to the element that supplies the color or to one of the two elements that part of the color forwarded after the color division.

Bei einer Flexodruckmaschine kann das aus den thermischen Zonen bestehende Temperaturprofiliersystem in Verbindung mit der Farbwanne, einer Tauchwalze oder einer Kammerrakel, der Rakel, der Rasterwalze, dem Druckzylinder oder dem Zentralzylinder vorgesehen sein. An jeder dieser Stellen kann die differenzierte Temperatursteuerung erfolgen.In the case of a flexographic printing machine, the temperature profiling system consisting of the thermal zones can be provided in connection with the ink tray, an immersion roller or a chamber doctor blade, the doctor blade, the anilox roller, the printing cylinder or the central cylinder. The differentiated temperature control can take place at each of these points.

Das Temperatursteuersystem kann im Inneren einer Walze angeordnet sein, die in unterschiedliche Kammern unterteilt ist, oder außerhalb einer solchen Walze, wobei es auf den Walzenumfang einwirkt.The temperature control system can be arranged inside a roller, which is divided into different chambers, or outside such a roller, whereby it acts on the circumference of the roller.

Gemäß einer weiteren Ausführungsform der Erfindung besteht die Möglichkeit, das für die Wärmeprofilierung vorgesehene Element mit einer Grundheizung zu versehen, die eine über die gesamte Breite einheitliche Temperatur erzeugt, und zusätzlich Wärmeaufteilungseinrichtungen vorzusehen, die einzelne Bereiche kühlen und andere Bereiche erwärmen. Solche Wärmeaufteilungsvorrichtungen sind als Peltier-Elemente bekannt.According to a further embodiment of the invention, it is possible to provide the element provided for the heat profiling with a basic heating which generates a uniform temperature over the entire width, and additionally to provide heat distribution devices which cool individual areas and heat other areas. Such heat splitters are known as Peltier elements.

Vorzugsweise sind mindestens drei separat steuerbare Heiz- oder Kühlzonen vorgesehen.At least three separately controllable heating or cooling zones are preferably provided.

Im folgenden werden unter Bezugnahme auf die Zeichnungen Ausführungsbeispiele der Erfindung näher erläutert.Exemplary embodiments of the invention are explained in more detail below with reference to the drawings.

Es zeigen:

Fig. 1
eine perspektivische Darstellung einer Flexodruckvorrichtung,
Fig. 2
einen Längsschnitt durch eine Walze zur Erzeugung eines Temperaturprofils,
Fig. 3
eine Ansicht einer Walze mit induktiver Walzenbeheizung zur Erzeugung eines Temperaturprofils,
Fig. 4
eine Ansicht einer Walze mit externer Infrarotbestrahlung zur Erzeugung eines Temperaturprofils,
Fig. 5
eine perspektivische Darstellung einer mit einer Walze zusammenwirkenden Rakel mit Temperaturprofilierung und
Fig. 6
einen Längsschnitt durch eine Walze mit Wärmeaufteilungseinrichtung.
Show it:
Fig. 1
2 shows a perspective illustration of a flexographic printing device,
Fig. 2
a longitudinal section through a roller for generating a temperature profile,
Fig. 3
1 shows a view of a roller with inductive roller heating for generating a temperature profile,
Fig. 4
a view of a roller with external infrared radiation for generating a temperature profile,
Fig. 5
a perspective view of a doctor blade interacting with temperature profiling and
Fig. 6
a longitudinal section through a roller with heat distribution device.

Fig. 1 zeigt eine Flexodruckvorrichtung, bei der die zu bedruckende Materialbahn 10 um einen Gegendruckzylinder 11 herum umläuft und dabei von einer Druckwalze 12 bedruckt wird. Die Druckwalze 12 trägt auf ihrem Umfang ein Klischee aus Elastomermaterial, das an den erhabenen Stellen Farbe von einer Rasterwalze 13 aufnimmt und auf die Materialbahn 10 überträgt.1 shows a flexographic printing device in which the material web 10 to be printed rotates around an impression cylinder 11 and is thereby printed by a printing roller 12. The printing roller 12 carries on its circumference a cliché made of elastomer material, which picks up ink from an anilox roller 13 at the raised points and transfers it to the material web 10.

Die Rasterwalze 13 weist an ihrem Umfang ein Raster aus zahlreichen Vertiefungen (Näpfchen) zur Aufnahme flüssiger Farbe auf. Sie dient als Übertragungs- und Dosierwalze zur Übertragung der Farbe auf das Klischee der Druckwalze 12. Am Umfang der Rastervalze 13 greift eine Rakel 14 an, die sich über die gesamte Breite der Rasterwalze erstreckt und die überschüssige Farbe von dieser Rasterwalze abstreicht, bevor dann die verbleibende Farbe auf die Druckwalze 12 übertragen wird.The anilox roller 13 has on its circumference a grid of numerous depressions (cups) for receiving liquid ink. It serves as a transfer and metering roller for transferring the ink onto the cliché of the printing roller 12. On the circumference of the anilox roller 13, a doctor blade 14 engages, which extends over the entire width of the anilox roller and wipes off the excess ink from this anilox roller, before the remaining ink is transferred to the printing roller 12.

Die Druckfarbe befindet sich in einer Farbwanne 15, in die eine Tauchwalze 16 eintaucht. Bei Drehung der Tauchwalze 16 überträgt diese die an ihrem Umfange haftende Farbschicht auf die Rasterwalze 13.The printing ink is located in an ink pan 15 into which an immersion roller 16 is immersed. When the immersion roller 16 rotates, it transfers the ink layer adhering to its circumference to the anilox roller 13.

Bei dem Ausführungsbeispiel von Fig. 1 ist die Farbwanne 15 parallel zur Axialrichtung des aus den Walzen 12,13 und 16 und der Rakel 14 bestehenden Farbauftragswerks 17 in thermische Zonen Z1,Z2 ... Zn unterteilt. Jede dieser Zonen ist mit einer eigenen Temperiervorrichtung T1,T2 ... Tn versehen, die separat steuerbar ist. Die Zonen Z1,Z2 ... Zn sind durch Zwischenwände 18 im Inneren der Farbwanne 15 voneinander getrennt. Diese Zwischenwände 18 brauchen keine vollständige Trennung der Zonen zu bewirken, sie verhindern jedoch, daß flüssige Farbe in der Farbwanne in Längsrichtung strömen kann. Sie bewirken, daß Farbmaterial, das sich in einer der Zonen befindet, auch während der Drehung der Tauchwalze 16 in dieser Zone verbleibt und kein wesentlicher Anteil der Farbe von einer Zone in andere Zonen überwechselt. Die Temperiervorrichtungen T1,T2 ... Tn sind einzeln, d.h. voneinander unabhängig, steuerbar und von einem (nicht dargestellten) Steuergerät aus einzustellen. Es ist auch möglich, daß das Steuergerät für sämtliche Temperiervorrichtungen eine gemeinsame Grundheizung einstellt und daß die individuelle Einstellbarkeit nur oberhalb dieser Grundheizung wirksam ist. Eine weitere Möglichkeit besteht darin, die Temperiervorrichtungen sämtlich mit derselben Heizenergie zu betreiben und sie an der Wanne 15 verschiebbar zu machen, so daß die Wärmeübertragung zwischen jeder Heizvorrichtung und der Wanne in der betreffenden thermischen Zone verändert wird. Wichtig ist nur, daß die einzelnen Zonen Z1,Z2 ... Zn individuell temperiert werden können, so daß in jeder der Zonen eine andere Temperatur einstellbar ist.In the embodiment of FIG. 1, the ink tray 15 is divided into thermal zones Z1, Z2... Zn parallel to the axial direction of the inking unit 17 consisting of the rollers 12, 13 and 16 and the doctor blade 14. Each of these zones is provided with its own temperature control device T1, T2 ... Tn, which can be controlled separately. The zones Z1, Z2 ... Zn are separated from one another by partitions 18 in the interior of the ink pan 15. These partitions 18 do not need to cause complete separation of the zones, but they prevent liquid paint from flowing longitudinally in the paint tray. They cause ink material which is in one of the zones to remain in this zone even during the rotation of the immersion roller 16 and does not transfer a substantial proportion of the ink from one zone to other zones. The temperature control devices T1, T2 ... Tn can be controlled individually, ie independently of one another, and can be set from a control unit (not shown). It is also possible that the control device sets a common basic heating for all temperature control devices and that the individual adjustability is only effective above this basic heating. Another possibility is to operate the tempering devices all with the same heating energy and to make them displaceable on the tub 15, so that the heat transfer between each heating device and the tub is changed in the thermal zone in question. It is only important that the individual zones Z1, Z2 ... Zn can be tempered individually, so that in each of the Zones a different temperature can be set.

Beim Betrieb der Druckvorrichtung kann der Drucker zunächst eine gewünschte Temperaturverteilung in den einzelnen Zonen grob einstellen. Danach erfolgt ein Probelauf. Hierbei wird Druckfarbe aus der Farbwanne 15 auf die Tauchwalze 16 übertragen. Die Druckflüssigkeit gelangt von hier auf die Rasterwalze 13, wo sie von der Rakel 14 teilweise abgestreift und dosiert wird. Die auf der Rasterwalze 13 verbliebene Druckflüssigkeit wird auf das Klischee der Druckwalze 12 und von diesem auf das Substrat 10 übertragen. Sämtliche Walzen 11,12,13 und 16 sind in den angegebenen Pfeilrichtungen angetrieben. Auf das Substrat 10 wirkt, nachdem das Substrat die Druckwalze 12 passiert hat, eine (nicht dargestellte) Behandlungseinrichtung ein, um die in flüssiger Form aufgebrachte Farbe zu härten. Diese Behandlungsvorrichtung kann eine UV-Bestrahlungseinrichtung oder eine Elektronenstrahl-Behandlungseinrichtung sein.When operating the printing device, the printer can first roughly set a desired temperature distribution in the individual zones. A test run then takes place. Here, ink is transferred from the ink pan 15 to the plunger roller 16. From here, the pressure fluid reaches the anilox roller 13, where it is partially stripped and metered by the doctor blade 14. The printing fluid remaining on the anilox roller 13 is transferred to the cliché of the printing roller 12 and from there to the substrate 10. All of the rollers 11, 12, 13 and 16 are driven in the indicated arrow directions. After the substrate has passed the pressure roller 12, a treatment device (not shown) acts on the substrate 10 in order to harden the ink applied in liquid form. This treatment device can be a UV irradiation device or an electron beam treatment device.

Nachdem der Drucker in einem Probelauf das Druckergebnis auf der Folienbahn 10 geprüft hat, kann er durch entsprechende Verstellung der Temperiervorrichtungen die Farbverteilung über die Breite der Folienbahn 10 verändern. Hierdurch wird die in den einzelnen Zonen auf die Tauchwalze 16 aufgetragene Farbmenge verändert. Die Veränderung der Temperatur der Farbe in den einzelnen Zonen kann auch während des Betriebes der Druckvorrichtung ohne Schwierigkeiten vorgenommen werden, da keine Eingriffe in die Mechanik des Druckwerks erforderlich sind.After the printer has checked the printing result on the film web 10 in a test run, it can change the color distribution across the width of the film web 10 by appropriate adjustment of the temperature control devices. This changes the amount of ink applied to the plunger roller 16 in the individual zones. The temperature of the ink in the individual zones can also be changed without difficulty during operation of the printing device, since no intervention in the mechanics of the printing unit is required.

Eine weitere Möglichkeit besteht darin, anstelle der Temperiervorrichtungen eine einheitliche Grundtemperatur für alle Zonen in Verbindung mit individuellen Kühl- und Heizeinrichtungen für jede Zone vorzusehen. Alternativ können die Temperiervorrichtungen derart ausgebildet sein, daß sie auch zum Kühlen geeignet sind. Dies ist insbesondere dann möglich, wenn die Heizvorrichtungen von einem Wärmeübertragungsfluid (Flüssigkeit oder Gas) durchströmt sind. Auch elektrische Heiz- oder Kühlvorrichtungen sind möglich.Another possibility is to use a uniform basic temperature instead of the temperature control devices To be provided for all zones in connection with individual cooling and heating devices for each zone. Alternatively, the temperature control devices can be designed such that they are also suitable for cooling. This is particularly possible when a heat transfer fluid (liquid or gas) flows through the heating devices. Electrical heating or cooling devices are also possible.

In Fig. 2 ist eine Walze 20 dargestellt, bei der es sich um die Tauchwalze 16, die Rasterwalze 13, die Druckwalze 12 der in Fig. 1 dargestellten Druckvorrichtung, oder um eine andere Walze des Farbauftragwerks handeln kann. Der Walzenkörper 21 ist in Achsrichtung der Walze 20 in mehrere durch Zwischenwände 22 voneinander thermisch getrennte Räume oder Zonen Z1,Z2 ... Zn unterteilt. Jede dieser Zonen enthält eine Temperiervorrichtung T1,T2 ... Tn, die beispielsweise aus einer Rohrschlange oder einer Elektroheizung bestehen kann. Die Temperiervorrichtungen haben jeweils eigene Anschlußleitungen, die durch die Hohlwelle 23 der Walze 20 herausgeführt sind. Durch unterschiedliche Steuerung der Temperiervorrichtungen kann somit das Temperaturprofil der Walze 20 über die Walzenbreite gezielt verändert werden. Die Wärme bzw. Kälte wird von den Temperiervorrichtungen T1,T2 ... Tn auf die zugehörigen Bereiche des Walzenmantels 21 übertragen. Diese Bereiche können durch wärmeisolierende Ringe voneinander getrennt sein. Der auf dem Walzenmantel 21 vorübergehend befindliche Film aus Farbflüssigkeit wird in den einzelnen Zonen Z1,Z2 ... Zn unterschiedlich stark erwärmt, so daß sich in den Zonen unterschiedliche Viskositäten des Farbmaterials ergeben. Durch die unterschiedlichen Temperaturen der Zonen wird das Verhalten der in diesen Zonen befindlichen Farbe bei Übertragung von einer Walze zur nächsten bzw. beim Zusammenwirken mit der Rakel 14 (Fig. 1) beeinflußt, wobei eine höhere Viskosität bzw. ein verringerter Flüssigkeitsgrad eine geringere Stärke der Farbschicht im weiteren Transportweg der Farbe zur Folge haben kann.FIG. 2 shows a roller 20, which can be the immersion roller 16, the anilox roller 13, the pressure roller 12 of the printing device shown in FIG. 1, or another roller of the inking unit. The roller body 21 is divided in the axial direction of the roller 20 into a plurality of spaces or zones Z1, Z2... Zn thermally separated from one another by partition walls 22. Each of these zones contains a temperature control device T1, T2 ... Tn, which can consist, for example, of a pipe coil or an electric heater. The temperature control devices each have their own connecting lines which are led out through the hollow shaft 23 of the roller 20. By differently controlling the temperature control devices, the temperature profile of the roller 20 can thus be changed in a targeted manner over the width of the roller. The heat or cold is transferred from the temperature control devices T1, T2 ... Tn to the associated areas of the roll shell 21. These areas can be separated from one another by heat-insulating rings. The film of ink liquid temporarily on the roller jacket 21 is heated to different extents in the individual zones Z1, Z2 ... Zn, so that different viscosities of the ink material result in the zones. The different temperatures of the zones change the behavior of the color in these zones during transmission influenced by one roller to the next or when interacting with the doctor blade 14 (FIG. 1), a higher viscosity or a reduced degree of liquid, which can result in a lower thickness of the ink layer in the further transport path of the ink.

Fig. 3 zeigt eine weitere Ausführungsform einer Walze 25, die durch Temperiervorrichtungen T1,T2 ... Tn über ihre axiale Länge unterschiedlich beheizt werden kann, so daß der Walzenmantel in Zonen Z1,Z2 ... Zn unterteilt ist. Die Temperiervorrichtungen sind bei dem vorliegenden Ausführungsbeispiel induktive Heizvorrichtungen, die jeweils einen Schwingkreis aus einer Spule 26 und einem Kondensator 27 aufweisen, welcher an eine separat steuerbare Wechselstromquelle 28 anschließbar ist. Der Mantel der Walze 25 besteht aus magnetisch leitendem Material und die Spulen 26 sind parallel zu diesem Mantel und in geringem Abstand von diesem angeordnet. Bei Erregung einer der Spulen 26 erzeugt diese Spule ein Magnetfeld, das in der entsprechenden Zone des Walzenmantels konzentriert wird. Da es sich um ein magnetisches Wechselfeld handelt, entstehen in dem Walzenmantel in der betreffenden Zone elektrische Wirbelströme, die eine Aufheizung des Walzenmantels bewirken. Diese Aufheizung erfolgt durch die am Walzenmantel befindliche Farbschicht hindurch. Die Temperiervorrichtungen befinden sich also außerhalb der Walze und sie wirken selektiv auf unterschiedliche Zonen des Walzenmantels ein. Die Walze 25 kann eine der in Fig. 1 dargestellten Walzen oder auch eine Rakel sein.Fig. 3 shows a further embodiment of a roller 25, which can be heated differently over its axial length by temperature control devices T1, T2 ... Tn, so that the roller shell is divided into zones Z1, Z2 ... Zn. In the present exemplary embodiment, the temperature control devices are inductive heating devices, each of which has an oscillating circuit comprising a coil 26 and a capacitor 27, which can be connected to a separately controllable AC power source 28. The jacket of the roller 25 consists of magnetically conductive material and the coils 26 are arranged parallel to this jacket and at a short distance from it. When one of the coils 26 is excited, this coil generates a magnetic field which is concentrated in the corresponding zone of the roll shell. Since it is an alternating magnetic field, electrical eddy currents are generated in the roll shell in the zone in question, which cause the roll shell to heat up. This heating takes place through the ink layer on the roller jacket. The temperature control devices are therefore outside the roller and they act selectively on different zones of the roller shell. The roller 25 can be one of the rollers shown in FIG. 1 or a doctor blade.

Bei dem Ausführungsbeispiel der Fig. 4 sind die auf den Walzenmantel der Walze 26 einwirkenden Temperiervorrichtungen T1,T2 ... Tn Infrarotstrahler 27, die einzeln und voneinander unabhängig leistungsgeregelt sind. Diese Infrarotstrahler strahlen jeweils Wärme auf eine der Zonen Z1,Z2 ... Zn des Walzenmantels 26, auf dem sich die Farbschicht befindet. Die Zonen sind durch wärmeisolierende Ringe 27 voneinander getrennt.In the exemplary embodiment in FIG. 4, the temperature control devices T1, T2... Tn acting on the roll shell of the roll 26 are infrared radiators 27 which are individually and independently performance-controlled. These infrared radiators each radiate heat to one of the zones Z1, Z2 ... Zn of the roller shell 26 on which the ink layer is located. The zones are separated from one another by heat-insulating rings 27.

Bei dem Ausführungsbeispiel nach Fig. 5 ist die mit der Rasterwalze 13 zusammenwirkende Rakel 14 in thermisch isolierte Zonen Z1,Z2 ... Zn unterteilt und jede dieser Zonen ist durch eine Temperiervorrichtung T1,T2 ... Tn selektiv beheizbar. Die Rakel 14 besteht aus einer Klinge 19, welche durch Zwischenwände 28 in Achsrichtung der Walze in mehrere Zonen Z1,Z2 ... Zn unterteilt ist. Die Zwischenwände 28 sind wärmeisolierend und sie verhindern das Überwechseln der Farbe von einer Zone in eine benachbarte Zone. Diese Zwischenwände brauchen nicht unmittelbar bis zur Walzenoberfläche zu reichen, sondern sie können mit der Walzenoberfläche jeweils einen schmalen Spalt bilden.In the exemplary embodiment according to FIG. 5, the doctor blade 14 cooperating with the anilox roller 13 is divided into thermally insulated zones Z1, Z2 ... Zn and each of these zones can be selectively heated by a temperature control device T1, T2 ... Tn. The doctor blade 14 consists of a blade 19 which is divided into several zones Z1, Z2 ... Zn by intermediate walls 28 in the axial direction of the roller. The partitions 28 are heat-insulating and prevent the change of color from one zone to an adjacent zone. These intermediate walls do not need to extend directly to the roller surface, but they can each form a narrow gap with the roller surface.

Die Temperiervorrichtungen T1,T2 ... Tn sind Heizelemente, die an der Klinge 19 der Rakel 14 im Bereich der einzelnen Zonen angebracht sind und die elektrisch unter Steuerung durch ein Steuergerät 29 versorgt werden. Das Steuergerät 29 weist für jedes Heizelement ein eigenes Stellorgan 30 auf, an dem die Temperatur dieses Temperierelementes eingestellt werden kann. Außerdem kann ein Regelkreis vorgesehen sein, der dafür sorgt, daß die am Stellorgan 30 eingestellte Temperatur exakt eingehalten wird.The temperature control devices T1, T2 ... Tn are heating elements which are attached to the blade 19 of the doctor blade 14 in the region of the individual zones and which are supplied electrically under the control of a control device 29. The control device 29 has a separate actuator 30 for each heating element, on which the temperature of this temperature control element can be adjusted. In addition, a control loop can be provided, which ensures that the temperature set on the actuator 30 is maintained exactly.

Fig. 6 zeigt eine Walze 32, bei der es sich um eine der in Fig. 1 dargestellten Walzen handeln kann. Diese Walze 32 ist hohl und ihr Inneres ist in Zonen Z1, Z2 ... Zn unterteilt. Die Zone Z1 enthält eine Rohrschlange 33, in der sich ein Wärmeübertragungsfluid befindet. Diese Rohrschlange ist über eine Rohrleitung 34 mit einer Wärmetauscherschlange 35 zu einem geschlossenen ersten Kreislauf 36 geschaltet.FIG. 6 shows a roller 32, which can be one of the rollers shown in FIG. 1. This roller 32 is hollow and its interior is divided into zones Z1, Z2 ... Zn. Zone Z1 contains a pipe coil 33 in which there is a heat transfer fluid. This coil is connected via a pipe 34 with a heat exchanger coil 35 to a closed first circuit 36.

In einer anderen Zone befindet sich ebenfalls eine Rohrschlange 37, die über eine Rohrleitung 38 und eine Wärmetauscherschlange 39 zu einem geschlossenen zweiten Kreislauf 40 geschaltet ist, in dem sich ebenfalls ein Wärmeübertragungsfluid befindet. Die Wärmetauscherschlangen 35 und 39 stehen in wärmeleitendem Kontakt mit einer Wärmeaufteilungseinrichtung 41, bei der es sich um ein Peltier-Element handeln kann. Die Wärmeaufteilungseinrichtung 41 ist über elektrische Leitungen 42 mit einer außerhalb der Walze angeordneten steuerbaren Stromquelle 43 verbunden.In another zone there is also a pipe coil 37, which is connected via a pipe 38 and a heat exchanger coil 39 to a closed second circuit 40, in which there is also a heat transfer fluid. The heat exchanger coils 35 and 39 are in heat-conducting contact with a heat distribution device 41, which can be a Peltier element. The heat distribution device 41 is connected via electrical lines 42 to a controllable current source 43 arranged outside the roller.

Die Wärmeaufteilungseinrichtung 41 hat die Wirkung, daß sie in Abhängigkeit von dem ihr durch die Leitungen 42 zugeführten Strom entweder dem ersten Kreislauf 36 Wärme entzieht und diese Wärme dem zweiten Kreislauf 40 zuführt, oder daß sie dem zweiten Kreislauf 40 Wärme entzieht und diese Wärme dem ersten Kreislauf 36 zuführt. Dadurch wird derjenige Kreislauf, dem Wärme entzogen wird, abgekühlt, während der andere Kreislauf erwärmt wird. Die Wärmeaufteilungseinrichtung 41 erzeugt an sich weder Wärme noch Kälte, sondern sie entzieht in Abhängigkeit von der Stromstärke dem einen Fluidkreislauf Wärme, die dem anderen Fluidkreislauf zugeführt wird. In beiden Fluidkreisläufen befindet sich das Wärmeübertragungsfluid durch (nicht dargestellte) Umwälzpumpen in ständigem Umlauf.The heat distribution device 41 has the effect that, depending on the current supplied to it by the lines 42, it either extracts heat from the first circuit 36 and supplies this heat to the second circuit 40, or that it extracts heat from the second circuit 40 and this heat from the first Circulation 36 supplies. As a result, the circuit from which heat is extracted is cooled while the other circuit is heated. The heat distribution device 41 does not generate any heat or cold per se, but, depending on the current intensity, extracts heat from one fluid circuit, which is supplied to the other fluid circuit. In both fluid circuits, the heat transfer fluid is in constant circulation by means of circulation pumps (not shown).

Bei dem Ausführungsbeispiel nach Fig. 6 ist die Rohrschlange 33 des ersten Kreislaufs 36 in der Zone Z1 der Walze 32 und die Rohrschlange 37 des zweiten Kreislaufs 40 in der Zone Z4 angeordnet. In den anderen Zonen befinden sich jeweils ebenfalls Rohrschlangen, die anderen Wärmeaufteilungseinrichtungen zugeordnet sind.In the embodiment of FIG. 6, the coil 33 of the first circuit 36 in the zone Z1 is Roller 32 and the coil 37 of the second circuit 40 are arranged in the zone Z4. In the other zones there are also coils, which are assigned to other heat distribution devices.

Es besteht ferner die Möglichkeit, den Walzenkörper einer Hohlwalze in mehrere Kammern zu unterteilen und jede dieser Kammern an eine Zuführleitung und an eine Abführleitung für ein Wärmeübertragungsmedium anzuschließen. Dabei kann für jede Kammer eine eigene Zuführleitung vorgesehen sein, es besteht jedoch auch die Möglichkeit, eine einzige Zuführleitung vorzusehen, die durch alle Kammern hindurchführt und die in jeder Kammer einen steuerbaren Auslaß hat, um die dieser Kammer zugeführte Wärmemenge steuern zu können. Ferner ist es möglich, eine derartige Leitung als Heizleitung und eine weitere Leitung als Kühlleitung in der Walze zu verlegen, wobei durch die gesteuerten Auslässe die jeweilige Zone der Walze wahlweise geheizt oder gekühlt werden kann.It is also possible to divide the roll body of a hollow roll into several chambers and to connect each of these chambers to a supply line and a discharge line for a heat transfer medium. A separate supply line can be provided for each chamber, but there is also the possibility of providing a single supply line which leads through all the chambers and which has a controllable outlet in each chamber in order to be able to control the amount of heat supplied to this chamber. Furthermore, it is possible to lay such a line as a heating line and a further line as a cooling line in the roller, the controlled zone of the respective zone of the roller optionally being able to be heated or cooled.

Claims (11)

Druckvorrichtung mit einem Gegendruckzylinder (11) und mit einem Farbauftragswerk (17) mit mindestens einer Walze zum Übertragen von Farbe auf ein Substrat, das zwischen Gegendruckzylinder (11) und Farbauftragswerk (17) durchläuft,
dadurch gekennzeichnet,
daß der Gegendruckzylinder (11) und/oder das Farbauftragswerk (17) in axialer Richtung in mehrere thermische Zonen (Z1,Z2 ... Zn) unterteilt ist, die einzeln steuerbare Temperiervorrichtungen (T1,T2 ... Tn) aufweisen.Printing device with an impression cylinder (11) and with an ink application unit (17) with at least one roller for transferring ink to a substrate which passes between the impression cylinder (11) and ink application unit (17),
characterized,
that the impression cylinder (11) and / or the inking unit (17) is divided in the axial direction into several thermal zones (Z1, Z2 ... Zn) which have individually controllable temperature control devices (T1, T2 ... Tn). Druckvorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß das Farbauftragswerk (17) eine Farbwanne (15) aufweist, welche in die thermischen Zonen unterteilt ist.Printing device according to claim 1, characterized in that the ink application unit (17) has an ink tray (15) which is divided into the thermal zones. Druckvorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das Farbauftragswerk (17) eine Tauchwalze (16) aufweist, welche in die thermischen Zonen unterteilt ist.Printing device according to claim 1 or 2, characterized in that the ink application unit (17) has an immersion roller (16) which is divided into the thermal zones. Druckvorrichtung nach einem der Ansprüche 1-3, dadurch gekennzeichnet, daß das Farbauftragswerk (17) eine Rakel (14) aufweist, welche in die thermischen Zonen unterteilt ist.Printing device according to one of claims 1-3, characterized in that the inking unit (17) has a doctor blade (14) which is divided into the thermal zones. Druckvorrichtung nach einem der Ansprüche 1-4, dadurch gekennzeichnet, daß das Farbauftragswerk (17) eine Rasterwalze (13) aufweist, welche in die thermischen Zonen unterteilt ist.Printing device according to one of claims 1-4, characterized in that the inking unit (17) has an anilox roller (13) which is divided into the thermal zones. Druckvorrichtung nach einem der Ansprüche 1-5, dadurch gekennzeichnet, daß das Farbauftragswerk (17) zwischen einer Rasterwalze (13) und dem Gegendruckzylinder (11) eine Druckwalze (12) aufweist, welche in die thermischen Zonen unterteilt ist.Printing device according to one of claims 1-5, characterized in that the inking unit (17) between a screen roller (13) and the impression cylinder (11) has a printing roller (12) which is divided into the thermal zones. Druckvorrichtung nach einem der Ansprüche 1-6, dadurch gekennzeichnet, daß der Innenraum einer Walze (20) in mehrere Kammern unterteilt ist, die die Temperiervorrichtungen (T1,T2 ... Tn) enthalten.Printing device according to one of claims 1-6, characterized in that the interior of a roller (20) is divided into several chambers which contain the temperature control devices (T1, T2 ... Tn). Druckvorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß die Farbwanne (15) in mehrere Kammern unterteilt ist, die die Temperiervorrichtungen (T1,T2 ... Tn) aufweisen.Printing device according to claim 2, characterized in that the ink tray (15) is divided into several chambers which have the temperature control devices (T1, T2 ... Tn). Druckvorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß die Rakel (14) mit Temperiervorrichtungen (T1,T2 ... Tn) versehen ist.Printing device according to claim 4, characterized in that the doctor blade (14) is provided with temperature control devices (T1, T2 ... Tn). Druckvorrichtung nach einem der Ansprüche 1-9, dadurch gekennzeichnet, daß mehrere Heiz- oder Kühlvorrichtungen an eine Wärmeaufteilungseinrichtung (41) angeschlossen sind, die eine dieser Vorrichtungen erwärmt und eine andere kühlt.Printing device according to one of Claims 1-9, characterized in that a plurality of heating or cooling devices are connected to a heat distribution device (41) which heats one of these devices and cools another. Druckvorrichtung nach einem der Ansprüche 1-10, dadurch gekennzeichnet, daß das Substrat in axialer Richtung in mehrere thermische Zonen (Z1 ... Zn) unterteilt ist, die durch Temperiervorrichtungen (T1 ... Tn) einzeln angesteuert werden können.Printing device according to one of claims 1-10, characterized in that the substrate is divided in the axial direction into a plurality of thermal zones (Z1 ... Zn) which can be individually controlled by temperature control devices (T1 ... Tn).
EP92103949A 1991-03-19 1992-03-07 Printing device Withdrawn EP0509226A1 (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0634271A1 (en) * 1993-07-16 1995-01-18 Baldwin-Gegenheimer GmbH Method and device for adjusting the temperature of an ink in the inking unit of a printing machine
EP0974460A1 (en) * 1998-06-23 2000-01-26 FGD, Forschungsgesellschaft Druckmaschinen e.V. Method and device for controlling the ink transfer in an inking unit
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WO2007148215A2 (en) * 2006-06-23 2007-12-27 Omet S.R.L. Flexographic printing machine with a drying, desiccation, polymerization and/or heating device of the inked strip
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