EP0663288B1 - Method and rotary printing machine for offset intaglio printing - Google Patents

Method and rotary printing machine for offset intaglio printing Download PDF

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Publication number
EP0663288B1
EP0663288B1 EP95100175A EP95100175A EP0663288B1 EP 0663288 B1 EP0663288 B1 EP 0663288B1 EP 95100175 A EP95100175 A EP 95100175A EP 95100175 A EP95100175 A EP 95100175A EP 0663288 B1 EP0663288 B1 EP 0663288B1
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EP
European Patent Office
Prior art keywords
cylinder
printing
gravure
ink
forme
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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.)
Expired - Lifetime
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EP95100175A
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German (de)
French (fr)
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EP0663288A1 (en
Inventor
Udo Tittgemeyer
Ingo Köbler
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Manroland AG
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MAN Roland Druckmaschinen AG
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Publication of EP0663288A1 publication Critical patent/EP0663288A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00—Inking and printing with a printer's forme
    • B41M1/10—Intaglio printing ; Gravure printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F9/00—Rotary intaglio printing presses
    • B41F9/01—Rotary intaglio printing presses for indirect printing

Definitions

  • the invention relates to a method and a rotary printing press for indirect gravure printing.
  • the traditional rotogravure printing unit contains one Gravure form cylinder, an intermediate roller and an impression roller, as in Fig. 1 shown.
  • the train will pass between Gravure cylinder and intermediate roller printed on one side.
  • the web must have a good expression due to the contact with the hard printing form, have a high smoothness.
  • the disadvantage is furthermore that thin, solvent-based printing inks for Application come so that the cells of the printing form are reliable can be filled and emptied during printing.
  • the Solvent vapors pollute the environment.
  • the thin Solvent ink continues to make a difference in multi-color printing Intermediate drying between the printing inks required because otherwise the color dots would run together on the substrate.
  • the immersion coloring still has that Disadvantage that tubular printing forms are not used can, because with the backing of printing ink, the form sleeve on the would stick carrier cylinder.
  • the change of printing form is complex because of this the ink pan must be lowered beforehand.
  • US-A-2 988 989 shows printing units for printing on webs which work in indirect gravure printing.
  • the printing units are on top of each other arranged and each contain the same size form and transfer cylinders. It works with a film-forming, heavy color, which is from a inking roller is brought to the forme cylinder, which is then doctored off with a squeegee becomes.
  • a drying device is provided between the printing units.
  • a rotary printing press is used to carry out the Procedure.
  • the invention deals with the stated viscosity a stickiness, the so-called tak, which causes the cells of the Let gravure form fill reliably.
  • tak causes the cells of the Let gravure form fill reliably.
  • the purchase of Transfer cylinder with its smooth surface the color well from the wells Printing form too suck and empty them to a large extent.
  • the closed one Surface of the cover continues to prevent penetration and thus a shearing off of thinners of the paint and thus the swelling of the Surface.
  • the complete detention of the image on the transfer medium is a color film a function of wettability, surface roughness and Layer crosslinking of the outer cover in relation to the Surface tension of the printing ink.
  • the cover of the Transfer cylinders also have significant mechanical requirements.
  • the deepened pressure points (wells) of the rotogravure form form from the cover and claim an extremely high axial elasticity in the pressure line.
  • the elastic, radially compressible cover has the Well no resistance, unlike the cylinder surface what leads to considerable transverse expansion in the pressure line.
  • the 1: 1 development ratio means that the spring-loaded pressure line is permanently shifted in the rotation, without relaxation, in contrast to the Offset. This situation becomes the extremely radially compressible cover with very high restoring forces (rebound - elasticity). The slightest damping (displacement) would become too considerable Tangential forces result from the connection joint of the cover to the body of the transfer cylinder could not be included.
  • the traditional gravure printing unit shown in Fig. 1 contains a gravure form cylinder 1, which in the printing ink of an ink pan 2 is immersed, as well as an intermediate roller 3 and an impression roller 4.
  • the in Fig. 2 gravure unit shown two printing units 6, 7 each a gravure forme cylinder 8, 9 and a transfer cylinder 10, 11 on. All cylinders 8 to 11 are in the side walls 12, 13 of the Printing unit mounted, the transfer cylinders 10, 11 in Eccentric bushes 14 to 17 are included (Fig. 3).
  • the transfer cylinders 10, 11 are both on the gravure forme cylinder 8, 9 of the respective printing unit 6, 7 as also adjustable against each other.
  • a chambered doctor blade 26, 27 is located on each gravure forme cylinder 8, 9 employed by a pump 28, 29 via a feed line, 30, 31 is supplied with paint. Return lines 32, 33 lead from the Chamber doctor blades 26, 27 to ink containers.
  • the gravure forms on the gravure form cylinders 8, 9 are inked by the chamber doctor blades 26, 27.
  • a water color with a viscosity of approx. 80 to 120 mPa s to use.
  • other colors for example radiation curable or offset inks with a viscosity of at least 80 to a maximum of 1000 mPa s can be printed.
  • the Chamber doctor blades are advantageously operated with ink circulation, i. H. the Pumps 28, 29 deliver more ink than is needed for printing. The color excess is on the return lines 32, 33 Paint containers 34, 35 fed again.
  • the Gravure cylinders 8, 9 with the respective transfer cylinder 10, 11 the colored cups give off the printing ink on them. These in turn transmit that in mutual rolling contact Print image on the web 36 passed between them.
  • the transfer cylinders 10, 11 each have a cover made of a fully crosslinked aliphatic polyurethane. Silicone could also be used.
  • the cover 37 is advantageously applied to a metallic carrier sleeve 38.
  • This reference sleeve 39 is shown in FIG. 4.
  • the reference 37 has a roughness depth R z ⁇ 6 ⁇ m.
  • the radial rebound elasticity of the cover is greater than 95%, its compression set less than 5%, preferably less than 2%, its hardness 70 to 80 Shore A. Its density is 0.30 to 0.65 g / cm 3 .
  • Such transfer cylinder sleeves are described in DE 39 08 999 C2.
  • the change of the reference sleeve 39 is for the transfer cylinder 10 in Fig. 5 shown.
  • the Diameter is larger than the outer diameter of the reference sleeve 39, is now the latter axially from the cylindrical body 42 of the Transfer cylinder pushed out of the printing unit.
  • the gravure forms of the gravure cylinders 8, 9 sleeve-shaped designed, also by the principle shown in Fig. 5 can be changed.
  • the cover sleeves or molded sleeves are changed after the appropriate cylinders were taken from the printing unit, for what for this, slots in the side walls by removing filler pieces be created.
  • the gravure cylinder can for example also with individual printing forms placed with a butt joint, e.g. B. magnetically adhesive.
  • the gravure form can also firmly on the cylindrical body of the gravure cylinder be upset. The cylinder can do this in the printing press illustrated and deleted.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Printing Methods (AREA)
  • Rotary Presses (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Screen Printers (AREA)
  • Ink Jet (AREA)

Description

Die Erfindung betrifft ein Verfahren und eine Rotationsdruckmaschine für indirekten Tiefdruck.The invention relates to a method and a rotary printing press for indirect gravure printing.

Das Druckwerk des traditionellen Tiefdrucks enthält einen Tiefdruckformzylinder, eine Zwischenwalze und einen Presseur, wie in Fig. 1 gezeigt. Die Bahn wird bei ihrem Durchgang zwischen Tiefdruckformzylinder und Zwischenwalze einseitig bedruckt. Für einen guten Ausdruck muß die Bahn, bedingt durch den Kontakt mit der harten Druckform, eine hohe Glätte aufweisen. Nachteilig ist weiterhin, daß dünnflüssige, lösungsmittelhaltige Druckfarben zur Anwendung kommen, damit die Näpfchen der Druckform zuverlässig gefüllt und beim Druck entleert werden können. Die Lösungsmitteldämpfe belasten die Umwelt. Die dünnflüssige Lösungsmittelfarbe macht weiterhin beim Mehrfarbendruck eine Zwischentrocknung zwischen den Druckfarben erforderlich, da ansonsten die Farbpunkte auf dem Bedruckstoff zusammenlaufen würden. Abgesehen vom Energieaufwand stellen die laufend wechselnde Naßbeaufschlagung und Trocknung der Bahn eine hohe Belastung dar und erfordert einen erheblichen Aufwand zur Einhaltung des Passers.Zur Einfärbung taucht der Tiefdruckformzylinder in die Farbe ein und wird mittels einer Rakel abgerakelt. Außer dem Farbspritzen bzw. -nebeln kommt es bei dieser Einfärbung unter der Rakel zu Farbstau, der eine Rakeldurchbiegung zur Folge hat. Diese wird durch erhöhte Rakelanstellkräfte kompensiert, was aber erhöhten Druckformverschleiß nach sich zieht. Außerdem ist die Rakeldurchbiegung umfangsgeschwindigkeitsabhängig, was zu Farbschwankungen führt. Die Taucheinfärbung hat weiterhin den Nachteil, daß hülsenförmige Druckformen nicht verwendet werden können, da mit dem Hinterlaufen von Druckfarbe die Formhülse auf dem Trägerzylinder verkleben würde. Der Druckformwechsel ist aufwendig, da hierfür zuvor die Farbwanne abgesenkt werden muß.The traditional rotogravure printing unit contains one Gravure form cylinder, an intermediate roller and an impression roller, as in Fig. 1 shown. The train will pass between Gravure cylinder and intermediate roller printed on one side. For The web must have a good expression due to the contact with the hard printing form, have a high smoothness. The disadvantage is furthermore that thin, solvent-based printing inks for Application come so that the cells of the printing form are reliable can be filled and emptied during printing. The Solvent vapors pollute the environment. The thin Solvent ink continues to make a difference in multi-color printing Intermediate drying between the printing inks required because otherwise the color dots would run together on the substrate. Apart from the energy expenditure, the constantly changing Wet loading and drying of the web represent a high load and requires considerable effort to comply with the register The gravure forme cylinder dips into the ink and is doctored off with a squeegee. In addition to spraying paint or -mist this inking creates a build-up of ink under the squeegee, which results in squeegee deflection. This is increased by Doctor blade force compensated, but what increased Printing plate wear results. Besides, that is Squeegee deflection depends on the circumferential speed, too Color fluctuations results. The immersion coloring still has that Disadvantage that tubular printing forms are not used can, because with the backing of printing ink, the form sleeve on the Would stick carrier cylinder. The change of printing form is complex because of this the ink pan must be lowered beforehand.

Mit der beschriebenen Zylinderkonfiguration wurde auch schon indirekt gedruckt, indem die Zwischenwalze mit einem Gummibelag versehen und die Bahn zwischen dieser und dem Presseur hindurchgeführt wurde. Infolge der Formatvariabilität des Tiefdruckformzylinders ist dieser im Umfang von dem der gummibeschichteten Zwischenwalze anders, so daß beide Zylinder nicht abwicklungssynchron umlaufen. Die Zwischenwalze muß deshalb nach jeder Umdrehung gewaschen werden Auch stehen die Zylinder nicht in Antriebsverbindung, so daß ihr schlupffreies Abwälzen und damit ein abschmierungsfreier Druck nicht garantiert ist. Außerdem werden bei der Druckabstellung Zwischenwalze und Presseur gemeinsam geradlinig vom Tiefdruckformzylinder abgestellt.With the cylinder configuration described, printing was also done indirectly, by providing the intermediate roller with a rubber covering and the web between this and the impression was led through. Due to the format variability of the Rotogravure forme cylinder is the same as the rubber-coated one Intermediate roller differently, so that both cylinders do not rotate in a synchronized manner. The intermediate roller must therefore also be washed after each revolution the cylinders are not in drive connection, so that they slip without rolling and therefore lubrication-free printing is not guaranteed. In addition, at the print roller intermediate roller and impression roller together in a straight line from Gravure cylinder turned off.

In der US-A-2 988 989 werden Druckeinheiten zum Druck auf Bahnen gezeigt, die im indirekten Tiefdruckverfahren arbeiten. Die Druckwerke sind übereinander angeordnet und enthalten jeweils gleich große Form- und Übertragungszylinder. Gearbeitet wird mit einer filmformenden, schweren Farbe, die von einer Einfärbwalze an den Formzylinder gebracht wird, der anschließend mit einer Rakel abgerakelt wird. Zwischen den Druckwerken ist jeweils eine Trockenvorrichtung vorgesehen.US-A-2 988 989 shows printing units for printing on webs which work in indirect gravure printing. The printing units are on top of each other arranged and each contain the same size form and transfer cylinders. It works with a film-forming, heavy color, which is from a inking roller is brought to the forme cylinder, which is then doctored off with a squeegee becomes. A drying device is provided between the printing units.

Es ist Aufgabe der Erfindung, ein Verfahren für indirekten Tiefdruck zu schaffen, das alle üblichen Farbsysteme ohne das Erfordernis einer Zwischentrocknung in guter Qualität verdruckt. Außerdem ist eine Rotationsdruckmaschine zur Durchführung des Verfahrens zu erstellen.It is an object of the invention to provide a method for indirect gravure printing all common color systems without the need for intermediate drying in good Quality printed. In addition, a rotary printing press is used to carry out the Procedure.

Diese Aufgabe wird erfindungsgemäß durch ein Verfahren mit den Merkmalen des Patentanspruchs 1 und durch eine Vorrichtung mit den Merkmalen des Patentanspruchs 5 gelöst. Die Erfindung umgeht mit der angegebenen Viskosität eine Klebrigkeit, den sogenannten Tak, wodurch sich die Näpfchen der Tiefdruckform zuverlässig füllen lassen. Außerdem vermag der Bezug des Transferzylinders mit seiner glatten Oberfläche die Farbe gut aus den Näpfchen der Druckform zu saugen und diese weitgehend zu entleeren. Die geschlossene Oberfläche des Bezuges vermeidet weiterhin ein Eindringen und somit ein Abscheren von Verdünnern der Farbe und somit das Quellen der Oberfläche. Im Gegensatz dazu haben die aus dem Offset bekannten Gummitücher oder elastomeren Bezüge grundsätzlich eine amorphe Struktur, was in Verbindung mit pastösen, öligen Druckfarben zu einer Haftung des Farbfilms größer als auf der Druckform mit anschließender Farbfilmspaltung beim Übergang auf den Bedruckstoff führt. Im Gegensatz dazu tritt bei der erfindungsgemäßen Lösung an die Stelle der Filmspaltung weitgehend die Umhaftung der Druckfarbe vom Übertragungsträger auf den Bedruckstoff. Die komplette Umhaftung des auf dem Übertragungsträger befindlichen Bildes als Farbfilm ist eine Funktion der Benetzbarkeit, Oberflächenrauheit und Schichtvernetzung des äußeren Bezuges im Verhältnis zur Oberflächenspannung der Druckfarbe.This object is achieved by a method with the features of Claim 1 and by a device with the features of Claim 5 solved. The invention deals with the stated viscosity a stickiness, the so-called tak, which causes the cells of the Let gravure form fill reliably. In addition, the purchase of Transfer cylinder with its smooth surface the color well from the wells Printing form too suck and empty them to a large extent. The closed one Surface of the cover continues to prevent penetration and thus a shearing off of thinners of the paint and thus the swelling of the Surface. In contrast, those known from offset Blankets or elastomeric covers basically one amorphous structure, which in connection with pasty, oily inks adhesion of the color film is greater than on the printing form Subsequent splitting of the color film during the transition to the substrate leads. In contrast, occurs in the solution according to the invention the place of film splitting largely the detachment of the printing ink from the transfer medium to the substrate. The complete detention of the image on the transfer medium is a color film a function of wettability, surface roughness and Layer crosslinking of the outer cover in relation to the Surface tension of the printing ink.

Neben diesen Oberflächeneigenschaften erfüllt der Bezug des Transferzylinders auch erhebliche mechanische Anforderungen. Die vertieften Druckpunkte (Näpfchen) der Tiefdruckform bilden sich auf dem Bezug ab und beanspruchen eine extrem hohe axiale Elatizität in der Drucklinie. Der elastische, radial kompressible Bezug hat auf den Näpfchen keinen Widerstand, im Gegensatz zur Zylinderoberfläche, was zur erheblichen Querdehnung in der Drucklinie führt.In addition to these surface properties, the cover of the Transfer cylinders also have significant mechanical requirements. The deepened pressure points (wells) of the rotogravure form form from the cover and claim an extremely high axial elasticity in the pressure line. The elastic, radially compressible cover has the Well no resistance, unlike the cylinder surface what leads to considerable transverse expansion in the pressure line.

Darüber hinaus bedeutet das 1:1 -Abwickelverhältnis, daß die eingefederte Drucklinie sich in der Umdrehung permanent verlagert, ohne daß es zu einer Entspannung kommen kann, im Gegensatz zum Offset. Dieser Situation wird der extrem radial kompressible Bezug mit sehr hohen Rückstellkräften (Rückprall - Elastizität) gerecht. Die geringste Dämpfung (Verdrängung) würde zu erheblichen Tangentialkräften führen, die von der Verbindungsfuge des Bezuges zum Körper des Transferzylinders nicht aufgenommen werden könnten.In addition, the 1: 1 development ratio means that the spring-loaded pressure line is permanently shifted in the rotation, without relaxation, in contrast to the Offset. This situation becomes the extremely radially compressible cover with very high restoring forces (rebound - elasticity). The slightest damping (displacement) would become too considerable Tangential forces result from the connection joint of the cover to the body of the transfer cylinder could not be included.

Mit der Erfindung sind alle üblichen Farbsysteme, wie wasserlösliche, strahlungshärtbare und Offsetfarben, also auch umweltfreundliche Farben, verarbeitbar. Dank der gegenüber herkömmlichen Lösungsmittel-Druckfarben höheren Viskosität der einsetzbaren Farben ist eine nachteilige Zwischentrocknung beim Mehrfarbendruck zwischen den einzelnen Druckwerken nicht erforderlich. Die Antriebsverbindung des Form-, Transfer- und Gegendruckzylinders ist eine Voraussetzung für ein schlupffreies Abrollen dieser Zylinder und damit eines sauberen, verschmierfreien Druckes. Schließlich erlaubt der indirekte Druck in Verbindung mit der Exzenter-Druckabstellung einfache, kompakte Maschinenkonfigurationen analog dem Offsetdruck, wie beispielsweise I-Druckwerke, H-Druckwerke, U-Druckwerke usw., beidseitig die Bahn zu bedrucken ermöglichend. Dank dem elastischen Bezug ist auch das Bedrucken von Druckträgern mit rauher Oberfläche, beispielsweise für Zeitungen und Verpackungen, möglich.With the invention, all common color systems, such as water-soluble, radiation-curable and offset inks, so too environmentally friendly colors, processable. Thanks to the opposite conventional solvent inks have higher viscosity usable colors is a disadvantageous intermediate drying when Multi-color printing between the individual printing units is not required. The drive connection of the form, transfer and Back pressure cylinder is a prerequisite for a slip-free Unroll these cylinders and thus a clean, smear-free one Pressure. Finally, the indirect pressure in connection with the eccentric pressure shutdown simple, compact Machine configurations analogous to offset printing, such as I printing units, H printing units, U printing units etc., the web on both sides enabling printing. Thanks to the elastic cover that is also Printing on media with a rough surface, for example for Newspapers and packaging, possible.

Weitere Merkmale und Vorteile ergeben sich aus den Unteransprüchen in Verbindung mit der Beschreibung.Further features and advantages result from the subclaims in connection with the description.

Die Erfindung soll nachfolgend an einem Ausführungsbeispiel näher erläutert werden. In den zugehörigen Zeichnungen zeigt schematisch

Fig. 1
ein Tiefdruckwerk nach dem Stand der Technik
Fig. 2
eine Tiefdruckeinheit mit zwei im Gummi - Gummi - Prinzip arbeitenden Druckwerken
Fig. 3
die Druckeinheit nach Fig. 2 im Schnitt
Fig. 4
die Bezugshülse des Transferzylinders in der Seitenansicht
Fig. 5
den Wechsel der Bezugshülse des Transferzylinders.
The invention will be explained in more detail using an exemplary embodiment. In the accompanying drawings shows schematically
Fig. 1
a gravure printing unit according to the state of the art
Fig. 2
a gravure printing unit with two printing units working in the rubber - rubber principle
Fig. 3
2 in section
Fig. 4
the reference sleeve of the transfer cylinder in side view
Fig. 5
the change of the reference sleeve of the transfer cylinder.

Das in Fig. 1 dargestellte althergebrachte Tiefdruckwerk enthält einen Tiefdruckformzylinder 1, der in die Druckfarbe einer Farbwanne 2 eintaucht, sowie eine Zwischenwalze 3 und einen Presseur 4. Beim Durchgang zwischen dem Tiefdruckformzylinder 1 und der Zwischenwalze 3 wird die Bahn 5 einseitig bedruckt. Dem gegenüber weist die in Fig. 2 gezeigte Tiefdruckeinheit zwei Druckwerke 6, 7 mit jeweils einem Tiefdruckformzylinder 8, 9 und einem Transferzylinder 10, 11 auf. Alle Zylinder 8 bis 11 sind in den Seitenwänden 12, 13 der Druckeinheit gelagert, wobei die Transferzylinder 10, 11 in Exzenterbuchsen 14 bis 17 aufgenommen werden (Fig. 3). Mittels der Exzenterbuchsen 14 bis 17 sind die Transferzylinder 10, 11 sowohl an den Tiefdruckformzylinder 8, 9 des jeweiligen Druckwerkes 6, 7 als auch gegeneinander anstellbar. Auf der Antriebsseite tragen die Zapfen 18 bis 21 der Zylinder 8 bis 11 jeweils ein Stirnrad 22 bis 25 und stehen damit mit ihrem jeweils benachbarten Zylinder in Antriebsverbindung.The traditional gravure printing unit shown in Fig. 1 contains a gravure form cylinder 1, which in the printing ink of an ink pan 2 is immersed, as well as an intermediate roller 3 and an impression roller 4. When Passage between the gravure forme cylinder 1 and the intermediate roller 3, the web 5 is printed on one side. The in Fig. 2 gravure unit shown two printing units 6, 7 each a gravure forme cylinder 8, 9 and a transfer cylinder 10, 11 on. All cylinders 8 to 11 are in the side walls 12, 13 of the Printing unit mounted, the transfer cylinders 10, 11 in Eccentric bushes 14 to 17 are included (Fig. 3). By means of the Eccentric bushes 14 to 17, the transfer cylinders 10, 11 are both on the gravure forme cylinder 8, 9 of the respective printing unit 6, 7 as also adjustable against each other. On the drive side they carry Pins 18 to 21 of the cylinders 8 to 11 each have a spur gear 22 to 25 and stand with their neighboring cylinder in Drive connection.

An jedem Tiefdruckformzylinder 8, 9 ist eine Kammerrakel 26, 27 angestellt, die mittels einer Pumpe 28, 29 über eine Zuleitung, 30, 31 mit Farbe versorgt wird. Rückleitungen 32, 33 führen von den Kammerrakeln 26, 27 zu Farbbehältern.A chambered doctor blade 26, 27 is located on each gravure forme cylinder 8, 9 employed by a pump 28, 29 via a feed line, 30, 31 is supplied with paint. Return lines 32, 33 lead from the Chamber doctor blades 26, 27 to ink containers.

Die auf dem Tiefdruckformzylindern 8, 9 befindlichen Tiefdruckformen werden von den Kammerrakeln 26, 27 eingefärbt. Im Ausführungsbeispiel kommt eine Wasserfarbe mit einer Viskosität von ca. 80 bis 120 mPa s zur Anwendung. Aber auch andere Farben, beispielsweise strahlungshärtbare oder Offsetfarben mit einer Viskosität von mindestens 80 bis maximal 1000 mPa s können verdruckt werden. Die Kammerrakeln werden vorteilhaft mit Farbumlauf betrieben, d. h. die Pumpen 28, 29 fördern mehr Farbe, als für das Drucken benötigt wird. Der Farbüberschuß wird über die Rückleitungen 32, 33 den Farbbehältern 34, 35 wieder zugeführt. Beim Abwälzen des Tiefdruckformzylinders 8, 9 mit dem jeweiligen Transferzylinder 10, 11 geben die eingefärbten Näpfchen die Druckfarbe an diesen ab. Diese wiederum übertragen im gegenseitigen Abrollkontakt das Druckbild auf die zwischen ihnen hindurchgeführte Bahn 36. The gravure forms on the gravure form cylinders 8, 9 are inked by the chamber doctor blades 26, 27. In the embodiment comes a water color with a viscosity of approx. 80 to 120 mPa s to use. But also other colors, for example radiation curable or offset inks with a viscosity of at least 80 to a maximum of 1000 mPa s can be printed. The Chamber doctor blades are advantageously operated with ink circulation, i. H. the Pumps 28, 29 deliver more ink than is needed for printing. The color excess is on the return lines 32, 33 Paint containers 34, 35 fed again. When rolling the Gravure cylinders 8, 9 with the respective transfer cylinder 10, 11 the colored cups give off the printing ink on them. These in turn transmit that in mutual rolling contact Print image on the web 36 passed between them.

Die Transferzylinder 10, 11 tragen jeweils einen Bezug aus einem vollvernetzten aliphatischen Polyurethan. Auch Silikon könnte angewendet werden. Der Bezug 37 ist vorteilhaft auf eine metallische Trägerhülse 38 aufgetragen. Diese Bezugshülse 39 ist in Fig. 4 gezeigt. Der Bezug 37 hat eine Rauhtiefe Rz ≤ 6 µm. Die radiale Rückpralleslatizität des Bezuges ist größer 95 %, sein Druckverformungsrest kleiner als 5 %, vorzugsweise kleiner als 2 %, seine Härte 70 bis 80 Shore A. Seine Dichte beträgt 0,30 bis 0,65 g/cm3. Derartige Transferzylinderhülsen sind in der DE 39 08 999 C2 beschrieben.The transfer cylinders 10, 11 each have a cover made of a fully crosslinked aliphatic polyurethane. Silicone could also be used. The cover 37 is advantageously applied to a metallic carrier sleeve 38. This reference sleeve 39 is shown in FIG. 4. The reference 37 has a roughness depth R z ≤ 6 μm. The radial rebound elasticity of the cover is greater than 95%, its compression set less than 5%, preferably less than 2%, its hardness 70 to 80 Shore A. Its density is 0.30 to 0.65 g / cm 3 . Such transfer cylinder sleeves are described in DE 39 08 999 C2.

Der Wechsel der Bezugshülse 39 ist für den Transferzylinder 10 in Fig. 5 dargestellt. Für den Wechsel wird aus der Seitenwand 13 das Wandstück 40 entnommen. Durch die so geschaffene Öffnung 41, deren Durchmesser größer als der Außendurchmesser der Bezugshülse 39 ist, wird nunmehr letztere axial vom zylindrischen Körper 42 des Transferzylinder aus dem Druckwerk geschoben. Vorteilhaft sind auch die Tiefdruckformen der Tiefdruckformzylinder 8, 9 hülsenförmig gestaltet, die ebenso durch das in Fig. 5 gezeigte Prinzip gewechselt werden können. Unter Benutzung der Erfindung können aber auch die Bezugshülsen bzw. Formhülsen gewechselt werden, nachdem die entsprechenden Zylinder aus dem Druckwerk entnommen wurden, wofür hierfür Schlitze in den Seitenwänden durch Entnahme von Füllstücken geschaffen werden. Der Tiefdruckformzylinder kann aber beispielsweise auch mit einzelnen mit Stoß aufgelegten Druckformen, z. B. magnetisch haftend, versehen sein. Auch kann die Tiefdruckform fest auf dem zylindrischen Körper des Tiefdruckformzylinders aufgebracht sein. Der Zylinder kann hierzu in der Druckmaschine bebildert und gelöscht werden.The change of the reference sleeve 39 is for the transfer cylinder 10 in Fig. 5 shown. For the change from the side wall 13 Wall piece 40 removed. Through the opening 41 thus created, the Diameter is larger than the outer diameter of the reference sleeve 39, is now the latter axially from the cylindrical body 42 of the Transfer cylinder pushed out of the printing unit. Are also advantageous the gravure forms of the gravure cylinders 8, 9 sleeve-shaped designed, also by the principle shown in Fig. 5 can be changed. However, using the invention also the cover sleeves or molded sleeves are changed after the appropriate cylinders were taken from the printing unit, for what for this, slots in the side walls by removing filler pieces be created. The gravure cylinder can for example also with individual printing forms placed with a butt joint, e.g. B. magnetically adhesive. The gravure form can also firmly on the cylindrical body of the gravure cylinder be upset. The cylinder can do this in the printing press illustrated and deleted.

Claims (10)

  1. Process for indirect gravure printing by means of a gravure forme cylinder (8, 9) of a transfer cylinder (10, 11), and an impression cylinder having a chambered doctor blade (26, 27) set onto the gravure forme cylinder (8, 9), which blade inks the printing forme with an ink having a viscosity in the range of from 80 to 1000 mPa s, ink is then removed from the cells of the printing forme by means of the covering (37) of the transfer cylinder (10, 11) as it makes rolling contact with the gravure forme cylinder (8, 9), and is transferred to the printing material as it passes between the transfer cylinder (10, 11) and the impression cylinder set on it, wherein because of poor wettability, low surface roughness and a closed surface of the covering (37) there is an appreciable removal of the printing ink from the cells and appreciable transfer to the printing material.
  2. Process according to claim 1, characterised in that the chambered doctor blade (26, 27) conveys an ink containing water as a solvent to the gravure forme cylinder (8, 9).
  3. Process according to claim 1, characterised in that the chambered doctor blade (26, 27) conveys a radiation-hardenable ink to the gravure forme cylinder (8, 9).
  4. Process according to claim 1, characterised in that the chambered doctor blade (26, 27) conveys an offset ink to the gravure forme cylinder (8, 9).
  5. Rotary printing machine for indirect gravure printing, the printing unit (6, 7) including the following features:
    a gravure forme cylinder (8, 9) which can be covered with a printing forme,
    a transfer cylinder (10, 11) with an elastic surface taking up the printed image from the gravure forme cylinder (8, 9),
    an impression cylinder,
    the above-mentioned cylinders (8, 9, 10, 11) are mounted in side walls (12, 13),
    the above-mentioned cylinders (8, 9, 10, 11) have the same circumferences and are in drive connection with spur gears (22 to 25) fixed on their journals (18 to 21),
    characterised in that
    the transfer cylinder (10, 11) can be applied and lifted with respect to the adjacent cylinders by means of eccentric bushings (14 to 17),
    a chambered doctor blade (26, 27) is set onto the gravure forme cylinder (8, 9) carrying the printed image and is supplied with an ink having a viscosity in the range of from 80 to 1000 mPa s,
    the transfer cylinder (10, 11) carries a covering with a closed surface, a surface roughness with a roughness depth of Rz < 6 µm, poor wettability and high compressibility with a radial rebound elasticity greater than 95%.
  6. Rotary printing machine according to claim 5, characterised in that the covering (37) of the transfer cylinder (10, 11) is made of a fully crosslinked aliphatic polyurethane or silicone.
  7. Rotary printing machine according to one of claims 5 to 6, characterised in that the covering (37) of the transfer cylinder (10, 11) is secured on a carrier sleeve (38), which is mounted on the cylindrical body (42) of the transfer cylinder (10, 11) and can be pushed axially from the body (42) out of the printing unit through an exposable opening (41) in the side wall (13) of the printing unit.
  8. Rotary printing machine according to one of claims 5 to 7, characterised in that the printing forme is constructed as a sleeve which is mounted on the cylindrical body of the gravure forme cylinder (8, 9) and can be pushed axially from the body out of the printing unit through an exposable opening in the side wall (13) of the printing unit.
  9. Rotary printing machine according to one of claims 5 to 8, characterised in that the chambered doctor blade (26, 27) has an ink feed connected to an ink pump (28, 29), and an ink discharge connected to an ink container (34, 35).
  10. Rotary printing machine according to one of claims 5 to 9, characterised in that the transfer cylinder (10, 11) of a further printing unit (6, 7) functions as an impression cylinder, and on it is also arranged a gravure forme cylinder (8, 9) with a chambered doctor blade (26, 27).
EP95100175A 1994-01-18 1995-01-09 Method and rotary printing machine for offset intaglio printing Expired - Lifetime EP0663288B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4401362 1994-01-18
DE4401362A DE4401362C2 (en) 1994-01-18 1994-01-18 Process and rotary printing machine for indirect gravure printing

Publications (2)

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EP0663288A1 EP0663288A1 (en) 1995-07-19
EP0663288B1 true EP0663288B1 (en) 1998-08-05

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US (1) US5718171A (en)
EP (1) EP0663288B1 (en)
JP (1) JP2888772B2 (en)
CA (1) CA2140496C (en)
DE (2) DE4401362C2 (en)

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DE19955214B4 (en) * 1999-11-17 2006-05-11 Stork Gmbh Method for producing conductor structures
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EP1598185A1 (en) * 2004-05-21 2005-11-23 DeMaxz Deutschland GmbH Device and process to print on wood or plastic substrate
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CN100339215C (en) * 2005-09-20 2007-09-26 史智勇 Printing equipment for metallic rolled material and printing technique therefor
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Also Published As

Publication number Publication date
JPH07205535A (en) 1995-08-08
DE4401362C2 (en) 1997-12-11
EP0663288A1 (en) 1995-07-19
US5718171A (en) 1998-02-17
CA2140496C (en) 1999-09-28
DE59503028D1 (en) 1998-09-10
DE4401362A1 (en) 1995-07-20
JP2888772B2 (en) 1999-05-10
CA2140496A1 (en) 1995-07-19

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