EP0324939B1 - Engraved roller for an offset inking unit and process for manufacturing such an engraved roller - Google Patents

Engraved roller for an offset inking unit and process for manufacturing such an engraved roller Download PDF

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Publication number
EP0324939B1
EP0324939B1 EP88120432A EP88120432A EP0324939B1 EP 0324939 B1 EP0324939 B1 EP 0324939B1 EP 88120432 A EP88120432 A EP 88120432A EP 88120432 A EP88120432 A EP 88120432A EP 0324939 B1 EP0324939 B1 EP 0324939B1
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EP
European Patent Office
Prior art keywords
layer
copper
ceramic layer
ceramic
engraved
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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.)
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EP88120432A
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German (de)
French (fr)
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EP0324939A2 (en
EP0324939A3 (en
Inventor
Rolf Herb
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Albert Frankenthal AG
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Albert Frankenthal AG
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N7/00—Shells for rollers of printing machines
    • B41N7/06—Shells for rollers of printing machines for inking rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N2207/00—Location or type of the layers in shells for rollers of printing machines
    • B41N2207/02—Top layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N2207/00—Location or type of the layers in shells for rollers of printing machines
    • B41N2207/10—Location or type of the layers in shells for rollers of printing machines characterised by inorganic compounds, e.g. pigments
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49544—Roller making
    • Y10T29/4956—Fabricating and shaping roller work contacting surface element
    • Y10T29/49563—Fabricating and shaping roller work contacting surface element with coating or casting about a core
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4998—Combined manufacture including applying or shaping of fluent material
    • Y10T29/49982—Coating

Definitions

  • the invention relates to an anilox roller according to the preamble of claim 1 and, according to a further concept of the invention, relates to a method for producing such an anilox roller.
  • An anilox roller of the type mentioned at the outset is known from US Pat . No. 4,637,310 .
  • an engraved base body is used, which is provided with a two-layer coating that follows the engraving.
  • the clear width and depth of the cups produced when the base body is engraved is changed by the subsequent coating.
  • the known arrangement results in comparatively wide webs as a result of the coating after the engraving, which is often undesirable.
  • the webs only consist of ceramic material in the area of their center and have a circumferential border made of comparatively soft material, which can have an unfavorable effect on the wear resistance that can be achieved.
  • the inner layer of the two-layer coating consists of ceramic material and the outer layer of copper, which is removed in the area of the lateral surface of the webs and remains as a lining in the area of the cells.
  • GB-A 2 049 102 shows an anilox roller in which an unengraved base body is used, which is provided with a ceramic layer which contains the cells produced by means of a laser beam.
  • This known anilox roller is suitable for flexographic printing inks and accordingly serves to transfer ink to the forme cylinder of a flexographic printing unit.
  • the object of the method is achieved according to the second concept of the invention in that the non-engraved base body is first coated with copper and then with ceramic and that the engraving is carried out on it, which penetrates the ceramic layer and extends into the copper layer.
  • the circumferential web surface advantageously consists overall of ceramic, ie. H. highly wear-resistant material.
  • the inner area of the wells is in solid copper.
  • the copper layer and the ceramic layer can each be ground to size, so that there is an exact thickness of the ceramic layer and excellent concentricity. Since the engraving is carried out as the last step, there is at the same time a high degree of accuracy in the raster geometry generated by the engraving.
  • Another advantage of the measures according to the invention can be seen in the fact that the inner copper layer can be easily removed, so that in the event of damage to the anilox roller, the entire coating can be removed and replaced in a simple manner.
  • the copper layer can be applied galvanically. This easily results in a copper layer in the desired thickness.
  • Another advantageous measure can consist in that the ceramic layer is applied using the plasma spraying process becomes. This ensures that the temperature of the substrate does not change very much during the application of the ceramic layer, so that the already existing copper layer is not damaged.
  • the engraving can be carried out using a laser beam. This measure ensures high accuracy.
  • the short inking unit on which FIG. 1 is based consists of a rubberized applicator roller 2 which cooperates with a plate cylinder 1 which can be covered with hard offset printing inks and which has the same diameter as the plate cylinder 1 and an anilox roller 3 which interacts with the applicator roller 2 and has a smaller diameter.
  • the applicator roller 2 also acts a dampening unit 4 together.
  • the circumference of the anilox roller 3 is provided with cups 5 indicated in an enlarged manner in FIG.
  • the cups 5 are filled with paint, the webs 6 are scraped off, so that there is an exact dosage of the color corresponding to the capacity of the cups 5.
  • the ink supply to the anilox roller 3 and the doctoring take place here by means of a chamber doctor blade 7. This consists of two doctor blades lying against the anilox roller 3 with a negative angle of attack, which delimit a chamber to which ink is applied.
  • the anilox roller 3, as can be seen in FIGS. 2 to 4, consists of a steel core 8, which can contain the lateral bearing journals and is coated on the circumference.
  • the steel core 8, which has a cylindrical, uninterrupted lateral surface, is first provided with an annular, uninterrupted copper layer 9. This can be applied galvanically.
  • the thickness of the copper layer 9 is approximately 50 ⁇ , which can easily be achieved with galvanic application. After the copper layer 9 has been produced, it is machined to size on the circumference, for example by a grinding and / or polishing process, as indicated in FIG. 2 by a processing symbol.
  • the circumferentially machined copper surface which accordingly has an exact cylindricity, is then, as can be seen from FIG. 3, with an uninterrupted, annular ceramic layer 10, for example in the form of a CrO layer.
  • This ceramic layer 10 can be applied in a plasma spraying process. An electric arc is generated here, which is driven out of a nozzle by a gas stream into which the ceramic material is introduced.
  • the temperature of the substrate increases only in the order of 100 ° C. to 200 ° C., so that the copper layer 9 is not damaged when the ceramic layer 10 is applied.
  • the ceramic layer 10 After completion of the ceramic layer 10, this is also processed, as indicated in FIG. 3 by a processing symbol. H. ground and / or polished and possibly lapped.
  • the processing operations after the application of the copper layer 9 and after the application of the ceramic layer 10 result not only in a high surface quality, but also in an exact, uniform thickness of the ceramic layer 10 and a high concentricity.
  • the thickness of the ceramic layer 10 can be approximately 10 ⁇ to 15 ⁇ , that is less than a third of the copper layer 9.
  • the double-coated roller body is, as indicated in FIG. 4, engraved on the circumference for the production of the cells 5.
  • the engraving depth is chosen so that the cups 5 penetrate the outer ceramic layer 10 and penetrate into the copper layer 9 without completely penetrating it.
  • the wells 5 are accordingly in solid copper in their lower region.
  • the well depth can be approximately 25 ⁇ to 30 ⁇ here be about 28 ⁇ .
  • the outside of the roller body which is coated with ceramic material, is engraved in a manner known per se by means of a laser beam, which ensures high accuracy.
  • the webs 6 produced by the engraving, as FIG. 4 clearly shows, consist of ceramic material in the area of their entire surface and have sharp, wear-resistant edges.
  • the laser beam can be set so that it penetrates the ceramic layer and penetrates to the desired depth in the copper layer. If the cell depth is to be increased subsequently, this can be done by etching, which, like in gravure printing, can be carried out without removing the anilox roller. If the cell is to be reduced in size, this can be achieved by galvanic copper plating. Accordingly, easy repair of the anilox roller is guaranteed.
  • the laser beam is simply adjusted so that it only penetrates the ceramic layer.

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  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
  • Printing Plates And Materials Therefor (AREA)

Description

Die Erfindung betrifft gemäß einem ersten Erfindungsgedanken eine Rasterwalze gemäß Oberbegriff des Anspruchs 1 und geht gemäß einem weiteren Erfindungsgedanken auf ein Verfahren zur Herstellung einer derartigen Rasterwalze.According to a first concept of the invention, the invention relates to an anilox roller according to the preamble of claim 1 and, according to a further concept of the invention, relates to a method for producing such an anilox roller.

Eine Rasterwalze eingangs erwähnter Art ist aus der US-PS 4 637 310 bekannt. Bei dieser bekannten Anordnung findet ein gravierter Grundkörper Verwendung, der mit einer zweilagigen, der Gravur folgenden Beschichtung versehen ist. Die lichte Weite und Tiefe der bei der Gravur des Grundkörpers erzeugten Näpfchen wird dabei durch die anschließende Beschichtung verändert. Hierbei besteht daher die Gefahr von unerwünschten Maßabweichungen, da bei der Beschichtung Dicken-Ungenauigkeiten gar nicht vermeidbar sind. Abgesehen davon ergeben sich bei der bekannten Anordnung infolge der nach der Gravur erfolgenden Beschichtung vergleichsweise breite Stege, was vielfach unerwünscht ist. Hinzu kommt, daß hierbei die Stege nur im Bereich ihres Zentrums aus keramischem Material bestehen und eine umlaufende Einfassung aus vergleichsweise weichem Material aufweisen, was sich ungünstig auf die erzielbare Verschleißfestigkeit auswirken kann. Bei der bekannten Anordnung besteht nämlich die innere Schicht der zweilagigen Beschichtung aus keramischem Material und die äußere Schicht aus Kupfer, das im Bereich der Mantelfläche der Stege abgetragen wird und im Bereich der Näpfchen als Auskleidung stehen bleibt.An anilox roller of the type mentioned at the outset is known from US Pat . No. 4,637,310 . In this known arrangement, an engraved base body is used, which is provided with a two-layer coating that follows the engraving. The clear width and depth of the cups produced when the base body is engraved is changed by the subsequent coating. There is therefore a risk of undesirable dimensional deviations, since inaccuracies in the thickness of the coating cannot be avoided at all. Apart from this, the known arrangement results in comparatively wide webs as a result of the coating after the engraving, which is often undesirable. In addition, the webs only consist of ceramic material in the area of their center and have a circumferential border made of comparatively soft material, which can have an unfavorable effect on the wear resistance that can be achieved. In the known arrangement, the inner layer of the two-layer coating consists of ceramic material and the outer layer of copper, which is removed in the area of the lateral surface of the webs and remains as a lining in the area of the cells.

Die GB-A 2 049 102 zeigt eine Rasterwalze, bei der ein ungravierter Grundkörper Verwendung findet, der mit einer Keramikschicht versehen ist, die mittels eines Laserstrahls erzeugte Näpfchen enthält. Diese bekannte Rasterwalze ist für Flexodruck-Farbwerke geeignet und dient dementsprechend dazu, Farbe auf den Formzylinder eines Flexodruckwerks zu übertragen. GB-A 2 049 102 shows an anilox roller in which an unengraved base body is used, which is provided with a ceramic layer which contains the cells produced by means of a laser beam. This known anilox roller is suitable for flexographic printing inks and accordingly serves to transfer ink to the forme cylinder of a flexographic printing unit.

Hiervon ausgehend ist es daher die Aufgabe der vorliegenden Erfindung, eine Rasterwalze eingangs erwähnter Art zu schaffen sowie eine einfache Herstellungsmöglichkeit für eine derartige Rasterwalze anzugeben, die nicht nur eine hohe Verschleißfestigkeit, sondern auch eine hohe Genauigkeit aufweist.Proceeding from this, it is therefore the object of the present invention to create an anilox roller of the type mentioned at the outset and to provide a simple production possibility for such an anilox roller which not only has high wear resistance but also high accuracy.

Diese Aufgabe wird gemäß dem ersten Erfindungsgedanken durch die kennzeichnenden Maßnahmen des Anspruchs 1 gelöst.This object is achieved according to the first inventive concept by the characterizing measures of claim 1.

Die auf das Verfahren zielende Aufgabe wird gemäß dem zweiten Erfindungsgedanken dadurch gelöst, daß der ungravierte Grundkörper zunächst mit Kupfer und danach mit Keramik beschichtet wird und daß darauf die Gravur erfolgt, die die Keramikschicht durchdringt und bis in die Kupferschicht reicht.The object of the method is achieved according to the second concept of the invention in that the non-engraved base body is first coated with copper and then with ceramic and that the engraving is carried out on it, which penetrates the ceramic layer and extends into the copper layer.

Hierbei besteht die umfangsseitige Stegoberfläche in vorteilhafter Weise insgesamt aus keramischen, d. h. höchst verschleißfestem Material. Der innere Bereich der Näpfchen befindet sich demgegenüber in Massivkupfer. Es ergeben sich somit eine extrem verschleißfeste Stegoberfläche sowie optimal Farbe führende Näpfchen. Die Kupferschicht und die Keramikschicht können jeweils auf Maß geschliffen werden, so daß sich exakte Dicke der Keramikschicht und ausgezeichnete Rundlaufgenauigkeit ergeben. Da die Gravur als letzter Arbeitsschritt vorgenommen wird, ergibt sich gleichzeitig eine hohe Genauigkeit der durch die Gravur erzeugten Rastergeometrie. Ein weiterer Vorteil der erfindungsgemäßen Maßnahmen ist darin zu sehen, daß sich die innere Kupferschicht leicht ablösen läßt, so daß im Falle einer Beschädigung der Rasterwalze die gesamte Beschichtung auf einfache Weise entfernt und erneuert werden kann.Here, the circumferential web surface advantageously consists overall of ceramic, ie. H. highly wear-resistant material. In contrast, the inner area of the wells is in solid copper. This results in an extremely wear-resistant bar surface and optimally color-guiding cells. The copper layer and the ceramic layer can each be ground to size, so that there is an exact thickness of the ceramic layer and excellent concentricity. Since the engraving is carried out as the last step, there is at the same time a high degree of accuracy in the raster geometry generated by the engraving. Another advantage of the measures according to the invention can be seen in the fact that the inner copper layer can be easily removed, so that in the event of damage to the anilox roller, the entire coating can be removed and replaced in a simple manner.

In vorteilhafter Weiterbildung der übergeordneten Maßnahmen kann die Kupferschicht galvanisch aufgetragen werden. Hierbei ergibt sich auf einfache Weise eine Kupferschicht in der erwünschten Dicke.In an advantageous development of the superordinate measures, the copper layer can be applied galvanically. This easily results in a copper layer in the desired thickness.

Eine weitere vorteilhafte Maßnahme kann darin bestehen, daß die Keramikschicht im Plasmaspritzverfahren aufgetragen wird. Hierbei ist sichergestellt, daß sich während des Auftrags der Keramikschicht die Temperatur des Untergrunds nicht sehr stark ändert, so daß die schon vorhandene Kupferschicht nicht beschädigt wird.Another advantageous measure can consist in that the ceramic layer is applied using the plasma spraying process becomes. This ensures that the temperature of the substrate does not change very much during the application of the ceramic layer, so that the already existing copper layer is not damaged.

In weiterer Fortbildung der übergeordneten Maßnahmen kann die Gravur mittels eines Laserstrahls vorgenommen werden. Diese Maßnahme gewährleistet eine hohe Genauigkeit.In a further development of the higher-level measures, the engraving can be carried out using a laser beam. This measure ensures high accuracy.

Weitere vorteilhafte Ausgestaltungen und zweckmäßige Weiterbildungen der übergeordneten Maßnahmen ergeben sich aus der nachstehenden Beschreibung eines Ausführungsbeispiels anhand der Zeichnung in Verbindung mit den restlichen Unteransprüchen.Further advantageous refinements and expedient further developments of the superordinate measures result from the following description of an exemplary embodiment using the drawing in conjunction with the remaining subclaims.

In der Zeichnung zeigen:

Figur 1
eine schematische Darstellung eines Kurzfarbwerks für eine Offsetdruckmaschine und
Figuren 2 bis 4
Teilansichten der Rasterwalze nach den einzelnen Verfahrensschritten.
The drawing shows:
Figure 1
a schematic representation of a short inking unit for an offset printing press and
Figures 2 to 4
Partial views of the anilox roller after the individual process steps.

Das der Figur 1 zugrundeliegende Kurzfarbwerk besteht aus einer mit einem mit harten Offsetdruckfarben belegbaren Plattenzylinder 1 zusammenwirkenden, gummierten Auftragwalze 2 gleichen Durchmessers wie der Plattenzylinder 1 und einer mit der Auftragwalze 2 zusammenwirkenden, einen kleineren Durchmesser aufweisenden Rasterwalze 3. Die Auftragwalze 2 wirkt gleichzeitig mit einem Feuchtwerk 4 zusammen. Der Umfang der Rasterwalze 3 ist mit in Figur 1 vergrößert angedeuteten Näpfchen 5 und diese begrenzenden Stegen 6 versehen.The short inking unit on which FIG. 1 is based consists of a rubberized applicator roller 2 which cooperates with a plate cylinder 1 which can be covered with hard offset printing inks and which has the same diameter as the plate cylinder 1 and an anilox roller 3 which interacts with the applicator roller 2 and has a smaller diameter. The applicator roller 2 also acts a dampening unit 4 together. The circumference of the anilox roller 3 is provided with cups 5 indicated in an enlarged manner in FIG.

Die Näpfchen 5 werden mit Farbe gefüllt, die Stege 6 werden abgerakelt, so daß sich eine dem Fassungsvermögen der Näpfchen 5 entsprechende, exakte Dosierung der Farbe ergibt. Die Farbzufuhr zur Rasterwalze 3 und die Abrakelung erfolgen hier mittels einer Kammerrakel 7. Diese besteht hier aus zwei mit negativem Anstellwinkel an der Rasterwalze 3 anliegenden Rakelblättern, welche zwischen sich eine mit Farbe beaufschlagte Kammer begrenzen.The cups 5 are filled with paint, the webs 6 are scraped off, so that there is an exact dosage of the color corresponding to the capacity of the cups 5. The ink supply to the anilox roller 3 and the doctoring take place here by means of a chamber doctor blade 7. This consists of two doctor blades lying against the anilox roller 3 with a negative angle of attack, which delimit a chamber to which ink is applied.

Die Rasterwalze 3 besteht, wie die Figuren 2 bis 4 erkennen lassen, aus einem Stahlkern 8, der die seitlichen Lagerzapfen enthalten kann und umfangsseitig beschichtet ist. Der Stahlkern 8, der eine zylindrische, ununterbrochene Mantelfläche aufweist, wird zunächst mit einer ringförmigen, ununterbrochenen Kupferschicht 9 versehen. Diese kann galvanisch aufgetragen werden. Die Dicke der Kupferschicht 9 beträgt etwa 50µ, was bei galvanischem Auftrag ohne weiteres erzielbar ist. Nach Herstellung der Kupferschicht 9 wird diese umfangsseitig etwa durch einen Schleif- und/oder Poliervorgang auf Maß bearbeitet, wie in Figur 2 durch ein Bearbeitungszeichen angedeutet ist.The anilox roller 3, as can be seen in FIGS. 2 to 4, consists of a steel core 8, which can contain the lateral bearing journals and is coated on the circumference. The steel core 8, which has a cylindrical, uninterrupted lateral surface, is first provided with an annular, uninterrupted copper layer 9. This can be applied galvanically. The thickness of the copper layer 9 is approximately 50μ, which can easily be achieved with galvanic application. After the copper layer 9 has been produced, it is machined to size on the circumference, for example by a grinding and / or polishing process, as indicated in FIG. 2 by a processing symbol.

Die umfangsseitig bearbeitete und dementsprechend eine exakte Zylindrizität aufweisende Kupferoberfläche wird anschließend, wie aus Figur 3 erkennbar ist, mit einer ununterbrochenen, ringförmigen Keramikschicht 10, etwa in Form einer CrO-Schicht, versehen. Diese Keramikschicht 10 kann im Plasmaspritzverfahren aufgebracht werden. Hierbei wird ein elektrischer Lichtbogen erzeugt, der durch einen Gasstrom, in den das keramische Material eingebracht wird, aus einer Düse ausgetrieben wird. Hierbei erhöht sich die Temperatur des Untergrunds lediglich in der Größenordnung von 100°C bis 200°C, so daß die Kupferschicht 9 bei der Aufbringung der Keramikschicht 10 nicht beschädigt wird.The circumferentially machined copper surface, which accordingly has an exact cylindricity, is then, as can be seen from FIG. 3, with an uninterrupted, annular ceramic layer 10, for example in the form of a CrO layer. This ceramic layer 10 can be applied in a plasma spraying process. An electric arc is generated here, which is driven out of a nozzle by a gas stream into which the ceramic material is introduced. Here, the temperature of the substrate increases only in the order of 100 ° C. to 200 ° C., so that the copper layer 9 is not damaged when the ceramic layer 10 is applied.

Nach Fertigstellung der Keramikschicht 10 wird diese, wie in Figur 3 durch ein Bearbeitungszeichen angedeutet ist, ebenfalls bearbeitet, d. h. geschliffen und/oder poliert und ggf. geläppt. Die Bearbeitungsvorgänge nach Aufbringung der Kupferschicht 9 und nach Aufbringung der Keramikschicht 10 ergeben nicht nur eine hohe Oberflächengüte, sondern auch eine exakte, gleichmäßige Dicke der Keramikschicht 10 sowie eine hohe Rundlaufgenauigkeit. Die Dicke der Keramikschicht 10 kann etwa 10µ bis 15µ, also weniger als ein Dritter der Kupferschicht 9 betragen.After completion of the ceramic layer 10, this is also processed, as indicated in FIG. 3 by a processing symbol. H. ground and / or polished and possibly lapped. The processing operations after the application of the copper layer 9 and after the application of the ceramic layer 10 result not only in a high surface quality, but also in an exact, uniform thickness of the ceramic layer 10 and a high concentricity. The thickness of the ceramic layer 10 can be approximately 10μ to 15μ, that is less than a third of the copper layer 9.

Der zweifach beschichtete Walzenkörper wird, wie in Figur 4 angedeutet ist, zur Herstellung der Näpfchen 5 umfangsseitig graviert. Die Gravurtiefe wird dabei so gewählt, daß die Näpfchen 5 die äußere Keramikschicht 10 durchdringen und in die Kupferschicht 9 eindringen, ohne diese vollständig zu durchsetzen. In ihrem unteren Bereich befinden sich die Näpfchen 5 dementsprechend in Massivkupfer. Die Näpfchentiefe kann bei einer Ausführung mit einer Dicke der Kupferschicht 9 von 50µ und der Keramikschicht 10 von 10µ bis 15µ etwa 25µ bis 30µ, hier etwa 28µ betragen. Eine größere Näpfchentiefe als 45µ kommt praktisch nicht vor, so daß man mit einer Dicke der Kupferschicht 9 von 50µ gut auskommt.The double-coated roller body is, as indicated in FIG. 4, engraved on the circumference for the production of the cells 5. The engraving depth is chosen so that the cups 5 penetrate the outer ceramic layer 10 and penetrate into the copper layer 9 without completely penetrating it. The wells 5 are accordingly in solid copper in their lower region. In the case of an embodiment with a thickness of the copper layer 9 of 50μ and the ceramic layer 10 of 10μ to 15μ, the well depth can be approximately 25μ to 30μ here be about 28µ. A cup depth greater than 45µ practically does not occur, so that a thickness of the copper layer 9 of 50µ is sufficient.

Die Gravur des an seiner Außenseite mit keramischem Material beschichteten Walzenkörpers erfolgt in an sich bekannter Weise mittels eines Laserstrahls, der eine hohe Genauigkeit gewährleistet. Die durch die Gravur erzeugten Stege 6 bestehen, wie Figur 4 anschaulich zeigt, im Bereich ihrer gesamten Oberfläche aus keramischem Material und besitzen scharfe, verschleißfeste Kanten.The outside of the roller body, which is coated with ceramic material, is engraved in a manner known per se by means of a laser beam, which ensures high accuracy. The webs 6 produced by the engraving, as FIG. 4 clearly shows, consist of ceramic material in the area of their entire surface and have sharp, wear-resistant edges.

Bei der ersten Gravur kann der Laserstrahl so eingestellt werden, daß er die Keramikschicht durchdringt und bis zur gewünschten Tiefe in die Kupferschicht eindringt. Sofern die Näpfchentiefe nachträglich vergrößert werden soll, kann dies durch Ätzung erfolgen, die, wie beim Tiefdruck, ohne Ausbau der Rasterwalze vorgenommen werden kann. Sofern die Näpfchen verkleinert werden soll, kann dies durch galvanische Aufkupferung erreicht werden. Hierdurch ist dementsprechend eine leichte Reparatur der Rasterwalze gewährleistet. Selbstverständlich wäre es auch denkbar, bereits bei der ersten Gravur mit Hilfe des Laserstrahls lediglich die Keramikschicht zu bearbeiten und anschließend die Kupferschicht zu ätzen. Hierzu wird der Laserstrahl einfach so eingestellt, daß er lediglich die Keramikschicht durchdringt.In the first engraving, the laser beam can be set so that it penetrates the ceramic layer and penetrates to the desired depth in the copper layer. If the cell depth is to be increased subsequently, this can be done by etching, which, like in gravure printing, can be carried out without removing the anilox roller. If the cell is to be reduced in size, this can be achieved by galvanic copper plating. Accordingly, easy repair of the anilox roller is guaranteed. Of course, it would also be conceivable to only process the ceramic layer with the aid of the laser beam during the first engraving and then to etch the copper layer. For this purpose, the laser beam is simply adjusted so that it only penetrates the ceramic layer.

Claims (10)

  1. An engraved roll for an inking unit associated with an offset printing machine and more particularly a short inking unit, which is provided with cells (5) which are separated from one another by partitions (6) containing ceramic material and have a oleophilic surface, preferably consisting of copper, and cooperates with at least one doctor blade in engagement with its periphery, preferably set at a negative angle, characterized by a cylindrical non-engraved base body (8), which is furnished with a coating (9) consisting of an oleophilic material, preferably copper and containing the cells (5) and which at the partitions (6) is covered by a ceramic layer (10).
  2. A method for the production of an engraved roll as claimed in claim 1, characterized in that the non-engraved base body (8) is firstly coated with an oleophilic material, preferably copper and after this is coated with ceramic material following which engraving is performed which penetrates the ceramic layer (10) and extends as far as the inner layer (9) consisting of oleophilic material.
  3. The method as claimed in claim 2, characterized in that after the application the layer (9) consisting of oleophilic material, preferably copper, such layer is processed on the periphery and is preferably ground and in that after application of the ceramic layer (10) such layer is also processed on the periphery, and is preferably ground and/or polished.
  4. The method as claimed in either of the preceding claims 2 and 3, characterized in that the copper layer (9) is applied by electroplating.
  5. The method as claimed in any one of the preceding claims 2 through 4, characterized in that the layer (9) consisting of oleophilic material, preferably copper has a thickness of approximately 50 µ.
  6. The method as claimed in any one of the preceding claims 2 through 5, characterized in that the ceramic layer (10) preferably consisting of CrO is applied by plasma spraying.
  7. The method as claimed in any one of the preceding claims 2 through 6, characterized in that the ceramic layer (10) possesses a thickness of approximately 10 µ to 15 µ.
  8. The method as claimed in any one of the preceding claims 2 through 7, characterized in that the depth of the cells (5) is less than 45 µ and is preferably equal to between 25 µ and 30µ and is most preferably equal to 28 µ.
  9. The method as claimed in any one of the preceding claims 2 through 8, characterized in that such engraving is performed at least to a depth equal to the thickness of the ceramic layer (10) by means of at least one laser beam.
  10. The method as claimed in claim 9, characterized in that etching is performed following the laser engraving operation and/or electroplating with copper.
EP88120432A 1987-12-24 1988-12-07 Engraved roller for an offset inking unit and process for manufacturing such an engraved roller Expired - Lifetime EP0324939B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873744131 DE3744131A1 (en) 1987-12-24 1987-12-24 GRID ROLLER FOR AN OFFSET INKING MACHINE AND METHOD FOR PRODUCING SUCH A GRID ROLLER
DE3744131 1987-12-24

Publications (3)

Publication Number Publication Date
EP0324939A2 EP0324939A2 (en) 1989-07-26
EP0324939A3 EP0324939A3 (en) 1991-04-03
EP0324939B1 true EP0324939B1 (en) 1994-03-09

Family

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Application Number Title Priority Date Filing Date
EP88120432A Expired - Lifetime EP0324939B1 (en) 1987-12-24 1988-12-07 Engraved roller for an offset inking unit and process for manufacturing such an engraved roller

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US (2) US4879791A (en)
EP (1) EP0324939B1 (en)
JP (1) JPH072420B2 (en)
DE (2) DE3744131A1 (en)

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Also Published As

Publication number Publication date
US4879791A (en) 1989-11-14
EP0324939A2 (en) 1989-07-26
JPH072420B2 (en) 1995-01-18
US5001821A (en) 1991-03-26
DE3744131C2 (en) 1990-01-04
DE3888338D1 (en) 1994-04-14
JPH01222961A (en) 1989-09-06
EP0324939A3 (en) 1991-04-03
DE3744131A1 (en) 1989-07-06

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