EP0589260A1 - Printing machine - Google Patents

Printing machine Download PDF

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Publication number
EP0589260A1
EP0589260A1 EP93114119A EP93114119A EP0589260A1 EP 0589260 A1 EP0589260 A1 EP 0589260A1 EP 93114119 A EP93114119 A EP 93114119A EP 93114119 A EP93114119 A EP 93114119A EP 0589260 A1 EP0589260 A1 EP 0589260A1
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EP
European Patent Office
Prior art keywords
web
printing
cooling
printing machine
cylinder
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Withdrawn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
EP93114119A
Other languages
German (de)
French (fr)
Inventor
Wolfgang Ertl
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.)
Heidelberg Web Carton Converting GmbH
Original Assignee
BHS Druck und Veredelungstechnik GmbH
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 BHS Druck und Veredelungstechnik GmbH filed Critical BHS Druck und Veredelungstechnik GmbH
Publication of EP0589260A1 publication Critical patent/EP0589260A1/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Withdrawn legal-status Critical Current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
    • B41F23/00—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing
    • B41F23/04—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing by heat drying, by cooling, by applying powders
    • B41F23/0483—Drying combined with cooling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B13/00—Machines and apparatus for drying fabrics, fibres, yarns, or other materials in long lengths, with progressive movement
    • F26B13/10—Arrangements for feeding, heating or supporting materials; Controlling movement, tension or position of materials
    • F26B13/14—Rollers, drums, cylinders; Arrangement of drives, supports, bearings, cleaning
    • F26B13/145—Rollers, drums, cylinders; Arrangement of drives, supports, bearings, cleaning on the non-perforated outside surface of which the material is being dried by convection or radiation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2200/00—Printing processes
    • B41P2200/10—Relief printing
    • B41P2200/12—Flexographic printing

Definitions

  • the invention relates to a printing press, in particular a flexographic printing press, according to the preamble of claim 1.
  • Printing machines of this type which are designed in a modular design, can be used as single-color printing machines or in a row arrangement as multi-color printing machines. Each individual printing press forms a closed unit.
  • Printing machines of this type are primarily designed as flexographic printing machines, but can also be designed as gravure or offset printing machines.
  • UV-curing inks are said to have already been used in label printing in the offset process, the printed side of the labels, which were attached to a carrier web, being guided past UV lamps. Cooling screens were provided on the other side of the track.
  • the invention has for its object to design a modular construction printing machine, in particular flexographic printing machine, so that the use under UV radiation curing inks is possible and that these inks are cured reliably in the printing press without using sensitive web materials , such as plastic films or thin metal films, there is a risk of warping the web.
  • the cooling of the web on the cooling cylinder can ensure that plastic foils do not shrink or metal foils do not warp.
  • the registration accuracy is maintained, which is particularly important when using the printing press as a component of multi-color printing presses.
  • the hardening time of the paints can also be influenced favorably by the cooling cylinder, since the cooling cylinder can be acted on with heated water, i.e. with water that is at a higher temperature than the ambient temperature, but still has a cooling effect on the web.
  • Several radiators can be arranged around the cooling cylinder according to the modular principle. A modular design is also possible in this respect. This also enables adaptation to different web speeds.
  • the printing machine shown in Fig. 1 has a frame 1 which is supported against the floor 2.
  • a printing unit 3 is arranged, which in the present case is a flexographic printing unit.
  • the printing unit 3 has a printing form cylinder 4, to which a printing form is attached.
  • the printing form cylinder 4 is driven in the usual way by means of a motor, not shown. It is mounted on a vertically movable y-carriage 5, which can be adjusted vertically by means of a carriage-drive motor 6 and in particular can be adjusted downwards in the vertical direction.
  • the printing form cylinder 4 bears against a raster cylinder 7 which, together with a so-called chamber squeegee 8, is arranged horizontally on an x-slide 9.
  • the adjustment or infeed takes place by means of a handwheel 10.
  • the chamber doctor blade 8 is a known device which is designed like a flat hood and lies tightly against the cylindrical surface of the raster cylinder 7. Color is input into the interior 11 between the chamber doctor blade 8 and the anilox cylinder 7, which ink is transferred from the anilox cylinder 7 to the printing form attached to the printing form cylinder 4.
  • the printing form cylinder 4 continues to bear against an impression cylinder 12.
  • the raster cylinder 7 can be advanced against the printing form cylinder 4 on a carriage 12a in the x direction, that is to say in the horizontal, by means of an actuating device 12b.
  • a positioning cylinder 13 presses against the impression cylinder 12 from below.
  • the positioning cylinder 13 is moved by means of a positioning drive 14, which is designed as a hydraulically actuatable piston-cylinder drive, into the position shown in FIG. 1 against the impression cylinder 12 or downwards therefrom swiveled out position adjusted.
  • the flexographic printing machine is basically known.
  • the printing unit 3 receives a web 15 of material to be printed, in particular metal foil, plastic foil, but also paper or metal-laminated paper, via a bearing in the frame Deflection roller 16 supplied.
  • This web 15 is guided in the usual way through the printing unit 3 and printed there with ink which is crosslinked under the influence of UV radiation, that is to say from a liquid to a solid, stable state.
  • Such printing inks are known. They contain photoinitiators that trigger the chaining mentioned under the influence of UV radiation. Conventional drying by evaporation or evaporation of liquid such as solvents, water or the like. does not take place here.
  • the printed web 15 is fed from the printing unit 3 to a UV radiation and cooling unit 17.
  • a cooling cylinder 18 mounted in the frame 1, which has an inner cooling jacket 19, which in turn is connected to a cooling water supply line 20 and a cooling water return line 21.
  • UV lamps 23, 23 'are arranged which, as can be seen in FIG. 1, are arranged one behind the other in the web direction 24.
  • the cooling cylinder 18 can be driven in the web direction 24 by means of a drive, not shown.
  • the web 15 is guided over a further deflection roller 25 which is mounted in the frame 1 such that the wrap angle ⁇ of the web 15 around the cooling cylinder 18 is relatively large. In the present case, the wrap angle is slightly larger than 180 °. From there, the web 15 is guided to a deflection roller 26 located in the lower region of the frame 1, via which the web 15 is guided out of the frame 1.
  • FIG. 2 it can be seen that several UV lamps can be provided as required.
  • a modular construction is also possible here.
  • the two UV emitters 23, 23 ' provided in FIG. 1, in the exemplary embodiment according to FIG. 2 there are in each printing machine four UV lamps 23, 23 ', 23'',23''' attached to the frame 1 one behind the other in the web direction 24.
  • the UV radiation applied per unit of time to the web 15 and thus the color located there per unit area can be well adapted to the actual needs .
  • the web 15 also heats up under UV radiation.
  • cooling by the cooling cylinder 18 is provided.
  • optimal cooling of the web 15 can be achieved by the choice of the temperature of the cooling water, which can also be slightly preheated compared to ambient conditions, the large wrap angle in particular also leading to a cooling section which is long in relation to the web direction 24.
  • Intensive cooling is particularly important when printing on plastic films or very thin metal films, in particular very thin aluminum films, since the films mentioned lose their dimensional stability under the influence of heat.
  • Plastic films can shrink; Metal foils can stretch or warp.
  • cooling cylinders 18 of different diameters can be used, whereby the length of the effective cooling surface and the surface over which the UV lamp can be used can be influenced.
  • Every printing press is a self-contained unit, in which not only printing, but also the ink curing under UV light is completely cured.
  • the web 15 will be guided with its unprinted side over the outer circumference 22 of the cooling cylinder 18, while its printed side faces the UV lamps 23, 23 ', 23' ', 23' ''.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Printing Methods (AREA)
  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)

Abstract

A printing machine, in particular a flexographic printing machine, of modular construction has a printing unit (3) on a frame (1), on which printing unit a web (15) in particular of plastic film or metal foil is printed with ink which hardens under UV radiation. Arranged in the frame (1) is a UV radiation and cooling unit (17) which has, on the one hand, a cooling cylinder (18) and, on the other hand, at least one UV radiator (23, 23'). The web is wrapped around the cooling cylinder (18) with a large wrapping angle (a). <IMAGE>

Description

Die Erfindung betrifft eine Druckmaschine, insbesondere Flexodruckmaschine, nach dem Oberbegriff des Anspruches 1.The invention relates to a printing press, in particular a flexographic printing press, according to the preamble of claim 1.

Derartige Druckmaschinen, die in Modulbauweise gestaltet sind, können als Einfarben-Druckmaschinen oder in Hintereinanderanordnung als Mehrfarben-Druckmaschinen eingesetzt werden. Jede einzelne Druckmaschine bildet eine geschlossene Einheit.Printing machines of this type, which are designed in a modular design, can be used as single-color printing machines or in a row arrangement as multi-color printing machines. Each individual printing press forms a closed unit.

Derartige Druckmaschinen sind primär als Flexodruckmaschinen ausgestaltet, können aber auch als Tiefdruck- oder Offsetdruck-Druckmaschinen ausgestaltet sein.Printing machines of this type are primarily designed as flexographic printing machines, but can also be designed as gravure or offset printing machines.

Da die üblichen Flexodruck- oder Tiefdruck- oder Offsetdruck-Farben Lösungsmittel enthalten, deren Entfernung aus der Abluft mit hohem Aufwand verbunden ist, werden inzwischen versuchsweise unter UV-Strahlung aushärtende Farben eingesetzt, die also weder Wasser als Lösungsmittel noch chemische Lösungsmittel enthalten und die unter UV-Strahlung im Rahmen einer chemischen Reaktion aushärten.Since the usual flexographic or gravure or offset printing inks contain solvents, the removal of which from the exhaust air is very time-consuming, in the meantime UV-curing inks are being used, which therefore contain neither water as a solvent nor chemical solvents and which under Cure UV radiation as part of a chemical reaction.

Derartige unter UV-Strahlung aushärtende Farben sollen bereits beim Etikettendruck im Offsetverfahren eingesetzt worden sein, wobei die bedruckte Seite der Etiketten, die auf einer Trägerbahn angebracht waren, an UV-Strahlern vorbeigeführt wurden. Auf der anderen Seite der Bahn waren Kühlblenden vorgesehen.Such UV-curing inks are said to have already been used in label printing in the offset process, the printed side of the labels, which were attached to a carrier web, being guided past UV lamps. Cooling screens were provided on the other side of the track.

Auch bei sogenannten Zentralzylindermaschinen ist es bereits bekannt geworden, zwischen den gegen den Zentralzylinder anliegenden Druckwerken UV-Strahler anzuordnen. Dies hat nicht zu befriedigenden Ergebnissen geführt.It has also become known in the case of so-called central cylinder machines, between the printing units lying against the central cylinder Arrange UV lamps. This has not led to satisfactory results.

Der Erfindung liegt die Aufgabe zugrunde, eine in Modulbauweise aufgebaute Druckmaschine, insbesondere Flexodruckmaschine, so auszugestalten, daß der Einsatz unter UV-Strahlung härtenden Farben möglich ist und daß diese Farben in der Druckmaschine zuverlässig ausgehärtet werden, ohne daß bei Einsatz von empfindlichen Bahn-Materialien, wie Kunststoff-Folien oder dünnen Metall-Folien, die Gefahr eines Verziehens der Bahn gegeben ist.The invention has for its object to design a modular construction printing machine, in particular flexographic printing machine, so that the use under UV radiation curing inks is possible and that these inks are cured reliably in the printing press without using sensitive web materials , such as plastic films or thin metal films, there is a risk of warping the web.

Diese Aufgabe wird bei einer Druckmaschine durch die Merkmale des Anspruches 1 gelöst.This object is achieved in a printing press by the features of claim 1.

Durch die Kühlung der Bahn auf dem Kühlzylinder kann sichergestellt werden, daß auch Kunststoff-Folien nicht schrumpfen oder Metall-Folien sich nicht verziehen. Die Passergenauigkeit bleibt erhalten, was insbesondere beim Einsatz der Druckmaschine als Baustein von Mehrfarben-Druckmaschinen von großer Bedeutung ist. Durch den Kühlzylinder kann wiederum auch die Aushärtezeit der Farben günstig beeinflußt werden, da der Kühlzylinder mit beheizbarem Wasser beaufschlagbar ist, d.h. mit Wasser, das eine höhere Temperatur als die Umgebungtemperatur hat, das insgesamt aber trotzdem noch kühlend auf die Bahn einwirkt. Es können mehrere Strahler nach dem Baukastenprinzip um den Kühlzylinder herum angeordnet werden. Auch insoweit ist eine Modulbauweise möglich. Dadurch ist auch eine Anpassung an unterschiedliche Bahngeschwindigkeiten möglich.The cooling of the web on the cooling cylinder can ensure that plastic foils do not shrink or metal foils do not warp. The registration accuracy is maintained, which is particularly important when using the printing press as a component of multi-color printing presses. The hardening time of the paints can also be influenced favorably by the cooling cylinder, since the cooling cylinder can be acted on with heated water, i.e. with water that is at a higher temperature than the ambient temperature, but still has a cooling effect on the web. Several radiators can be arranged around the cooling cylinder according to the modular principle. A modular design is also possible in this respect. This also enables adaptation to different web speeds.

Weitere vorteilhafte Merkmale, Vorteile und Einzelheiten der Erfindung ergeben sich aus den Unteransprüchen und der nachfolgenden Beschreibung eines Ausführungsbeispiels der Erfindung anhand der Zeichnung. Es zeigt

Fig. 1
eine Seitenansicht einer Druckmaschine in schematischer Darstellung und
Fig. 2
zwei hintereinander zu einer Mehrfarben-Druckmaschine zusammengestellte Druckmaschinen.
Further advantageous features, advantages and details of the invention result from the subclaims and the following description of an embodiment of the invention with reference to the drawing. It shows
Fig. 1
a side view of a printing press in a schematic representation and
Fig. 2
two printing machines assembled one behind the other to form a multicolour printing machine.

Die in Fig. 1 dargestellte Druckmaschine weist ein Gestell 1 auf, das gegenüber dem Boden 2 abgestützt ist. Im oberen Teil des Gestells ist ein Druckwerk 3 angeordnet, bei dem es sich im vorliegenden Fall um ein Flexodruckwerk handelt. Das Druckwerk 3 weist einen Druckformzylinder 4 auf, an dem eine Druckform angebracht ist. Der Druckformzylinder 4 wird in üblicher Weise mittels eines nicht dargestellten Motors angetrieben. Er ist an einem vertikal verfahrbaren y-Schlitten 5 gelagert, der mittels eines Schlitten-Antriebs-Motors 6 in der Vertikalen verstellbar und insbesondere in der Vertikalen nach unten zustellbar ist.The printing machine shown in Fig. 1 has a frame 1 which is supported against the floor 2. In the upper part of the frame, a printing unit 3 is arranged, which in the present case is a flexographic printing unit. The printing unit 3 has a printing form cylinder 4, to which a printing form is attached. The printing form cylinder 4 is driven in the usual way by means of a motor, not shown. It is mounted on a vertically movable y-carriage 5, which can be adjusted vertically by means of a carriage-drive motor 6 and in particular can be adjusted downwards in the vertical direction.

Der Druckformzylinder 4 liegt gegen einen Rasterzylinder 7 an, der zusammen mit einer sogenannten Kammer-Rakel 8 auf einem x-Schlitten 9 in der Horizontalen verstellbar angeordnet ist. Die Verstellung bzw. Zustellung erfolgt mittels eines Handrades 10. Bei der Kammer-Rakel 8 handelt es sich um eine bekannte Einrichtung, die wie eine flache Haube ausgebildet ist und dicht gegen die zylindrische Oberfläche des Rasterzylinders 7 anliegt. In den Innenraum 11 zwischen der Kammer-Rakel 8 und dem Rasterzylinder 7 wird Farbe eingegeben, die von dem Rasterzylinder 7 auf die auf dem Druckformzylinder 4 angebrachte Druckform übertragen wird.The printing form cylinder 4 bears against a raster cylinder 7 which, together with a so-called chamber squeegee 8, is arranged horizontally on an x-slide 9. The adjustment or infeed takes place by means of a handwheel 10. The chamber doctor blade 8 is a known device which is designed like a flat hood and lies tightly against the cylindrical surface of the raster cylinder 7. Color is input into the interior 11 between the chamber doctor blade 8 and the anilox cylinder 7, which ink is transferred from the anilox cylinder 7 to the printing form attached to the printing form cylinder 4.

Der Druckformzylinder 4 liegt weiterhin gegen einen Gegendruckzylinder 12 an. Der Rasterzylinder 7 ist auf einem Schlitten 12a in x-Richtung, also in der Horizontalen, mittels einer Betätigungseinrichtung 12b gegen den Druckformzylinder 4 zustellbar. Von unten drückt wiederum ein Anstellzylinder 13 gegen den Gegendruckzylinder 12. Der Anstellzylinder 13 wird mittels eines als hydraulisch beaufschlagbarer Kolben-Zylinder-Antrieb ausgebildeten Anstell-Antriebs 14 in die in Fig. 1 dargestellte gegen den Gegendruckzylinder 12 angestellte Stellung bzw. aus dieser nach unten heraus geschwenkte Stellung verstellt. Insoweit, als sie bisher beschrieben ist, ist die Flexodruckmaschine grundsätzlich bekannt.The printing form cylinder 4 continues to bear against an impression cylinder 12. The raster cylinder 7 can be advanced against the printing form cylinder 4 on a carriage 12a in the x direction, that is to say in the horizontal, by means of an actuating device 12b. Again, a positioning cylinder 13 presses against the impression cylinder 12 from below. The positioning cylinder 13 is moved by means of a positioning drive 14, which is designed as a hydraulically actuatable piston-cylinder drive, into the position shown in FIG. 1 against the impression cylinder 12 or downwards therefrom swiveled out position adjusted. To the extent that it has been described so far, the flexographic printing machine is basically known.

Dem Druckwerk 3 wird von einer nicht dargestellten Rolle eine Bahn 15 von zu bedruckendem Material, insbesondere Metall-Folie, Kunststoff-Folie, aber auch Papier oder metall-kaschiertes Papier, über eine im Gestell gelagerte Umlenkrolle 16 zugeführt. Diese Bahn 15 wird in üblicher Weise durch das Druckwerk 3 geführt und dort mit Farbe bedruckt, die unter Einfluß von UV-Strahlung vernetzt, also vom flüssigen in einen festen beständigen Zustand übergeht. Derartige Druckfarben sind bekannt. Sie enthalten Fotoinitiatoren, die unter Einfluß von UV-Strahlung die erwähnte Verkettung auslösen. Eine konventionelle Trocknung durch Verdampfung bzw. Verdunstung von Flüssigkeit, wie Lösungsmitteln, Wasser od.dgl. findet hierbei nicht statt.From a roll (not shown), the printing unit 3 receives a web 15 of material to be printed, in particular metal foil, plastic foil, but also paper or metal-laminated paper, via a bearing in the frame Deflection roller 16 supplied. This web 15 is guided in the usual way through the printing unit 3 and printed there with ink which is crosslinked under the influence of UV radiation, that is to say from a liquid to a solid, stable state. Such printing inks are known. They contain photoinitiators that trigger the chaining mentioned under the influence of UV radiation. Conventional drying by evaporation or evaporation of liquid such as solvents, water or the like. does not take place here.

Vom Druckwerk 3 wird die bedruckte Bahn 15 einer UV-Strahlungs- und Kühl-Einheit 17 zugeführt. Diese besteht aus einem im Gestell 1 gelagerten Kühlzylinder 18, der einen inneren Kühlmantel 19 aufweist, der wiederum an eine Kühlwasservorlauf-Leitung 20 und eine Kühlwasserrücklauf-Leitung 21 angeschlossen ist. Mit geringem Abstand vom Außenumfang 22 des Kühlzylinders 18 sind UV-Strahler 23, 23' angeordnet, die - wie Fig. 1 entnehmbar ist - in Bahnrichtung 24 hintereinander angeordnet sind. Der Kühlzylinder 18 kann mittels eines nicht dargestellten Antriebs in Bahnrichtung 24 angetrieben sein. Die Bahn 15 wird über eine weitere Umlenkrolle 25 geführt, die derart im Gestell 1 gelagert ist, daß der Umschlingungswinkel a der Bahn 15 um den Kühlzylinder 18 verhältnismäßig groß ist. Im vorliegenden Fall ist der Umschlingungswinkel etwas größer als 180°. Von dort wird die Bahn 15 zu einer im unteren Bereich des Gestells 1 befindlichen Umlenkrolle 26 geführt, über die die Bahn 15 aus dem Gestell 1 herausgeführt wird.The printed web 15 is fed from the printing unit 3 to a UV radiation and cooling unit 17. This consists of a cooling cylinder 18 mounted in the frame 1, which has an inner cooling jacket 19, which in turn is connected to a cooling water supply line 20 and a cooling water return line 21. At a short distance from the outer circumference 22 of the cooling cylinder 18, UV lamps 23, 23 'are arranged which, as can be seen in FIG. 1, are arranged one behind the other in the web direction 24. The cooling cylinder 18 can be driven in the web direction 24 by means of a drive, not shown. The web 15 is guided over a further deflection roller 25 which is mounted in the frame 1 such that the wrap angle α of the web 15 around the cooling cylinder 18 is relatively large. In the present case, the wrap angle is slightly larger than 180 °. From there, the web 15 is guided to a deflection roller 26 located in the lower region of the frame 1, via which the web 15 is guided out of the frame 1.

Wenn - wie in Fig. 2 dargestellt - mehrere der jeweils einen Modul bildenden Druckmaschinen in Bahnrichtung 24 hintereinander zu einer Mehrfarben-Druckmaschine zusammengefügt sind, dann werden zwei benachbarte Gestelle 1 mittels einer Traverse 27 auf Abstand miteinander verbunden, wobei in dieser Traverse 27 eine Umlenkrolle 28 gelagert ist, über die die Bahn 15 der Umlenkrolle 16 zugeführt wird.If, as shown in FIG. 2, several of the printing machines, each forming a module, are joined to one another in the web direction 24 to form a multicolour printing machine, then two adjacent frames 1 are connected to one another at a distance by means of a cross member 27, with a cross roller in this cross member 27 28 is mounted, via which the web 15 is fed to the deflection roller 16.

In Fig. 2 ist erkennbar, daß je nach Bedarf mehrere UV-Strahler vorgesehen werden können. Auch hier ist insoweit also eine Modulbauweise möglich. Anstelle der in Fig. 1 vorgesehenen zwei UV-Strahlern 23, 23' sind bei dem Ausführungsbeispiel nach Fig. 2 an jeder Druckmaschine jeweils vier UV-Strahler 23, 23', 23'', 23''' in Bahnrichtung 24 hintereinander am Gestell 1 angebracht.In Fig. 2 it can be seen that several UV lamps can be provided as required. A modular construction is also possible here. Instead of the two UV emitters 23, 23 'provided in FIG. 1, in the exemplary embodiment according to FIG. 2 there are in each printing machine four UV lamps 23, 23 ', 23'',23''' attached to the frame 1 one behind the other in the web direction 24.

Durch diese wahlweise Anbringung von mehr oder weniger UV-Strahlern 23, 23', 23'', 23''' kann die pro Zeiteinheit auf die Bahn 15 und damit die dort befindliche Farbe pro Flächeneinheit aufgebrachte UV-Strahlung den tatsächlichen Bedürfnissen gut angepaßt werden. Insbesondere bei unterschiedlichen Bahngeschwindigkeiten, also unterschiedlichen Druckgeschwindigkeiten, ist hierdurch eine einfache Anpassung an die erforderliche Strahlungsleistung möglich. Auch unter UV-Strahlung erwärmt sich die Bahn 15. Hierzu ist die Kühlung durch den Kühlzylinder 18 vorgesehen. Auch hier kann durch die Wahl der Temperatur des Kühlwassers, das gegenüber Umgebungsbedingungen auch leicht vorgewärmt sein kann, eine optimale Kühlung der Bahn 15 erreicht werden, wobei insbesondere auch der große Umschlingungswinkel zu einer - bezogen auf die Bahnrichtung 24 - langen Kühlstrecke führt. Eine intensive Kühlung ist besonders wichtig beim Bedrucken von Kunststoff-Folien oder sehr dünnen Metall-Folien, und zwar insbesondere sehr dünnen Aluminium-Folien, da die erwähnten Folien unter Wärmeeinfluß ihre Formstabilität verlieren. Kunststoff-Folien können schrumpfen; Metall-Folien können sich dehnen oder verziehen.Through this optional attachment of more or fewer UV lamps 23, 23 ', 23' ', 23' '', the UV radiation applied per unit of time to the web 15 and thus the color located there per unit area can be well adapted to the actual needs . In particular at different web speeds, that is to say different printing speeds, this enables simple adaptation to the required radiation power. The web 15 also heats up under UV radiation. For this purpose, cooling by the cooling cylinder 18 is provided. Here, too, optimal cooling of the web 15 can be achieved by the choice of the temperature of the cooling water, which can also be slightly preheated compared to ambient conditions, the large wrap angle in particular also leading to a cooling section which is long in relation to the web direction 24. Intensive cooling is particularly important when printing on plastic films or very thin metal films, in particular very thin aluminum films, since the films mentioned lose their dimensional stability under the influence of heat. Plastic films can shrink; Metal foils can stretch or warp.

Wie die Zeichnung erkennen läßt können Kühlzylinder 18 unterschiedlichen Durchmessers eingesetzt werden, wodurch die Länge der wirksamen Kühlfläche und die Fläche über der UV-Strahler eingesetzt werden können, beeinflußbar ist.As can be seen in the drawing, cooling cylinders 18 of different diameters can be used, whereby the length of the effective cooling surface and the surface over which the UV lamp can be used can be influenced.

Jede Druckmaschine ist eine in sich geschlossene Einheit, in der nicht nur gedruckt, sondern auch die unter UV-Licht aushärtende Farbe vollständig ausgehärtet wird. Die Bahn 15 wird mit ihrer unbedruckten Seite über den Außenumfang 22 des Kühlzylinders 18 geführt werden, während ihre bedruckte Seite den UV-Strahlern 23, 23', 23'', 23''' zugewandt ist.Every printing press is a self-contained unit, in which not only printing, but also the ink curing under UV light is completely cured. The web 15 will be guided with its unprinted side over the outer circumference 22 of the cooling cylinder 18, while its printed side faces the UV lamps 23, 23 ', 23' ', 23' ''.

Claims (5)

Druckmaschine, insbesondere Flexodruckmaschine, - mit einem Gestell (1) - mit einem auf dem Gestell (1) angeordneten Druckwerk (3), insbesondere einem Flexodruckwerk, das mit einer Auftragseinrichtung (Kammer-Rakel 8) für unter UV-Licht aushärtende Farbe versehen ist, - mit Umlenkrollen (16, 26, 28) zur Zuführung einer zu bedruckenden Bahn (15), insbesondere aus Metall-Folie oder Kunststoff-Folie, in Bahnrichtung (24) zum Druckwerk (3) und zum Abführen der bedruckten Bahn (15) vom Druckwerk (3) - mit einer UV-Strahlungs- und Kühl-Einheit (17), die einen Kühlzylinder (18) aufweist, über dessen Außenumfang (22) die Bahn (15) führbar ist und die mindestens einen UV-Strahler (23, 23', 23'', 23''') aufweist, der in geringem Abstand vom Außenumfang (22) des Kühlzylinders (18) angeordnet ist. Printing machine, in particular flexographic printing machine, - with a frame (1) with a printing unit (3) arranged on the frame (1), in particular a flexographic printing unit, which is provided with an application device (chamber doctor blade 8) for ink curing under UV light, - With deflection rollers (16, 26, 28) for feeding a web (15) to be printed, in particular made of metal foil or plastic foil, in web direction (24) to the printing unit (3) and for removing the printed web (15) from Printing unit (3) - With a UV radiation and cooling unit (17), which has a cooling cylinder (18), over the outer circumference (22) of which the web (15) can be guided and the at least one UV lamp (23, 23 ', 23rd '', 23 '''), which is arranged at a short distance from the outer circumference (22) of the cooling cylinder (18). Druckmaschine nach Anspruch 1, dadurch gekennzeichnet, daß der Kühlzylinder (18) mit Kühlwasser beaufschlagbar ist.Printing machine according to claim 1, characterized in that the cooling cylinder (18) can be acted upon by cooling water. Druckmaschine nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß mehrere UV-Strahler (23, 23', 23'', 23''') baukastenartig in Bahnrichtung (24) hintereinander am Gestell (1) anbringbar sind.Printing machine according to Claim 1 or 2, characterized in that a plurality of UV lamps (23, 23 ', 23'',23''') can be attached to the frame (1) one behind the other in the manner of a module in the web direction (24). Druckmaschine nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß Kühlzylinder (18) unterschiedlichen Durchmessers einsetzbar sind.Printing machine according to one of claims 1 to 3, characterized in that cooling cylinders (18) of different diameters can be used. Druckmaschine nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Bahn (15) mit großem Umschlingungswinkel (a) um den Kühlzylinder (18) führbar ist.Printing machine according to one of claims 1 to 4, characterized in that the web (15) can be guided around the cooling cylinder (18) with a large wrap angle (a).
EP93114119A 1992-09-07 1993-09-03 Printing machine Withdrawn EP0589260A1 (en)

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DE4229352A DE4229352A1 (en) 1992-09-07 1992-09-07 Printing press
DE4229352 1992-09-07

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EP1356933A1 (en) * 2002-04-23 2003-10-29 Fischer & Krecke Gmbh & Co. Printing machine with drying station
CN118163501A (en) * 2024-04-23 2024-06-11 扬州大学 BC battery metallization process, screen printing table and control method thereof

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DE4229352A1 (en) 1994-04-14

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