EP0287002B1 - Engraved roller for an offset inking device, and manufacturing method for such an engraved roller - Google Patents

Engraved roller for an offset inking device, and manufacturing method for such an engraved roller Download PDF

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Publication number
EP0287002B1
EP0287002B1 EP88105687A EP88105687A EP0287002B1 EP 0287002 B1 EP0287002 B1 EP 0287002B1 EP 88105687 A EP88105687 A EP 88105687A EP 88105687 A EP88105687 A EP 88105687A EP 0287002 B1 EP0287002 B1 EP 0287002B1
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EP
European Patent Office
Prior art keywords
coating
pits
pitted
hard ceramic
thickness
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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.)
Revoked
Application number
EP88105687A
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German (de)
French (fr)
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EP0287002A3 (en
EP0287002A2 (en
Inventor
Rudolf Herb
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Koenig and Bauer AG
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Albert Frankenthal AG
Koenig and Bauer Albert AG
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Application filed by Albert Frankenthal AG, Koenig and Bauer Albert AG filed Critical Albert Frankenthal AG
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    • 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

Definitions

  • the invention relates to an anilox roller for an inking unit assigned to an offset printing machine, in particular a short inking unit, with a steel core and a screened surface which has webs and cups and which cooperates with at least one doctor blade, preferably in the form of a chamber doctor blade, which is connected to the doctor blade Contacting surface of the webs consists of material harder than the steel core and the cups are provided with a hydrophobic surface coating.
  • An anilox roller of this type is known from US-A 4,637,310.
  • the steel core is engraved.
  • the surface of the engraved blank is subjected to a nitriding process, i.e. diffusion hardening.
  • a copper layer is applied to the hardened surface.
  • the nitriding process proposed here for producing a hard layer is cumbersome and complex and not reliable enough. It can happen that the Diffusion speed is not the same everywhere, so that there may be an insufficient depth of diffusion and thus the thickness of the hardened layer.
  • the strength which can be achieved with a diffusion hardening of the type proposed here is not always able to cope with the loads to be expected in the case of applications of the type present here.
  • GB-A 2 049 102 shows an anilox roller with a ceramic jacket that is engraved on a steel core.
  • the cells are not surface-coated.
  • the surface in the area of the wells therefore proves to be moisture-friendly, which can have an unfavorable effect on the adhesion of the color in the wells and the filling of the wells with paint.
  • the result of this can be fluctuations in the amount of ink transferred and thus fluctuations in color density in the printed image.
  • the cells are designed as recesses provided with a hydrophobic surface coating of a hard ceramic material, peripheral coating of the steel core, which is engraved on the surface and has a thickness greater than the depth of the cells.
  • 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 plates and which has the same diameter as the plate cylinder and an anilox roller 3 which cooperates with the applicator roller 2.
  • the applicator roller 2 acts simultaneously with a dampening unit 4 together.
  • the circumference of the anilox roller 3 is provided with cups 5 indicated in an enlarged manner in FIG. 1 and the webs 6 delimiting them.
  • 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 by means of a chamber doctor blade arrangement designated as a whole in FIG. This consists of two doctor blades lying against the anilox roller 3 with a negative angle of attack, which delimit a chamber acted upon by ink between them.
  • the anilox roller 3 as can best be seen from FIG. 2, consists of a steel core 8, which can have the side bearing stubs, and a coating 9 made of hard ceramic material on the circumference of the steel core 8, into which the cups 5 are embedded. Chromium oxide or aluminum oxide can be used to form the hard ceramic coating. Materials of this type can easily be applied to the steel core 8 by spraying.
  • the thickness of the coating 9 is approximately 150 ⁇ .
  • the depth of the cells 5 is of the order of magnitude between 20 ⁇ to 50 ⁇ . The thickness of the coating 9 is therefore at least about three times the depth of the cells.
  • the cups 5 When the cups 5 are engraved into the coating 9 made of hard-ceramic material, such as chromium oxide or aluminum oxide or the like, webs 6 between the cups 5, which consist of hard-ceramic material, automatically result.
  • the webs 6 accordingly consist of a high-strength material, so that a high wear resistance is achieved.
  • the wells 5 are provided with a lining 10, as can further be seen in FIG. which consists of water-repellent and color-accepting material, for example vapor-deposited copper, which is also resistant to color and cleaning agents.
  • the hard ceramic coating 9 can, as already mentioned above, be applied to the steel core 8 by spraying. Such a coating produces a blank of the type on which FIG. 3 is based. If necessary, this blank can be ground to achieve an exact concentricity and an exact diameter.
  • the cups 5 are then engraved into the coating 9, so that the state underlying FIG. 4 results.
  • the hard ceramic coating 9 should be engraved with the aid of a laser beam. This enables a high level of engraving accuracy to be achieved.
  • the cups 5 are engraved into the hard ceramic coating 9, as already stated above, they result was believed, the webs made of hard ceramic material 6 automatically. Following the engraving, the blank processed so far is ground on the circumference and polished or lapped in order to deburr the webs 6 and smooth the surface. This processing stage is based on FIG. 4 /.
  • the blank on which FIG. 4 is based is then coated on the circumference with a fine layer of hydrophobic material.
  • film-like copper plating should be provided for this.
  • the layer thickness of this coating is small compared to the layer thickness of the hard ceramic coating 9 and is approximately 4 ⁇ m to 5 ⁇ m.
  • Such a coating can be vapor-deposited or applied galvanically or the like.
  • nickel or silicone or asphalt or a suitable plastic in the form of Teflon or Rilsan could also be used. Silicon or asphalt can be applied by brushing or spraying.
  • This coating initially also covers the circumferential head surface of the webs 6. In this area, however, abrasion takes place within a very short time during operation, so that grinding off after the coating has taken place can be dispensed with. However, it would also be readily conceivable to grind the webs 6 on the head side after the pulling-on process until hard ceramic material emerges, so that constant conditions would be expected from the start during operation.
  • the hydrophobic coating is retained on the surface of the cups 5 that is recessed relative to the peripheral surface and thereby forms the hydrophobic lining 10.
  • This lining 10 reduces the capacity of the wells 5 which are initially engraved in the hard ceramic coating 9 by laser beam.
  • the actual engraving depth T indicated in FIG. 4 must accordingly be deeper by the thickness of the lining 10 than the engraving of a conventional anilox roller, i. H. by the thickness of the lining 10 is deeper than the depth t indicated in FIG. 2 required to achieve the desired capacity of the wells 5 provided with the lining 10.
  • the hard ceramic coating 9 and the coating that results in the lining 10 each consist of a layer of the same material.

Description

Die Erfindung betrifft eine Rasterwalze für ein einer Offsetdruckmaschine zugeordnetes Farbwerk, insbesondere Kurzfarbwerk, mit einem Stahlkern und einer gerasterten, Stege und Näpfchen aufweisenden Oberfläche, die mit wenigstens einer an ihrem Umfang anliegenden Rakel, vorzugsweise in Form einer Kammerrakel zusammenwirkt, wobei die mit der Rakel in Berührung kommende Fläche der Stege aus gegenüber dem Stahlkern härterem Material besteht und die Näpfchen mit einer hydrophoben Oberflächenbeschichtung versehen sind.The invention relates to an anilox roller for an inking unit assigned to an offset printing machine, in particular a short inking unit, with a steel core and a screened surface which has webs and cups and which cooperates with at least one doctor blade, preferably in the form of a chamber doctor blade, which is connected to the doctor blade Contacting surface of the webs consists of material harder than the steel core and the cups are provided with a hydrophobic surface coating.

Eine Rasterwalze dieser Art ist aus der US-A 4 637 310 bekannt. Bei dieser bekannten Anordnung ist der Stahlkern graviert. Der gravierte Rohling wird an seiner Oberfläche einem Nitrierverfahren, das heißt einer Diffusionshärtung, unterzogen. Auf die gehärtete Oberfläche wird eine Kupferschicht aufgebracht. Das hier zur Erzeugung einer harten Schicht in Vorschlag gebrachte Nitrierverfahren ist umständlich und aufwendig und nicht zuverlässig genug. Es kann nämlich vorkommen, daß die Diffusionsgeschindigkeit nicht überall gleich ist, so daß sich unter Umständen eine ungenügende Diffusionstiefe und damit Dicke der gehärteten Schicht ergibt. Abgesehen davon ist die mit einer Diffusionshärtung hier vorgeschlagener Art erzielbare Festigkeit den bei Einsatzfällen hier vorliegender Art zu erwartenden Belastungen nicht immer gewachsen.An anilox roller of this type is known from US-A 4,637,310. In this known arrangement, the steel core is engraved. The surface of the engraved blank is subjected to a nitriding process, i.e. diffusion hardening. A copper layer is applied to the hardened surface. The nitriding process proposed here for producing a hard layer is cumbersome and complex and not reliable enough. It can happen that the Diffusion speed is not the same everywhere, so that there may be an insufficient depth of diffusion and thus the thickness of the hardened layer. Apart from this, the strength which can be achieved with a diffusion hardening of the type proposed here is not always able to cope with the loads to be expected in the case of applications of the type present here.

Aus der US-A 4 601 242 ergibt sich eine Offset-Rasterwalze, bei der ein gerasterter Stahlmantel mit einer inneren Kupferplattierung und einer darüber sich befindenden, äußeren Keramikplattierung versehen ist. Hierbei handelt es sich lediglich um eine sehr dünne, poröse Keramikschicht, die der Gefahr eines Durchbrechens unterliegt. Porös muß die genannte Keramikschicht sein, um die Wirkung der darunter sich befindenden Kupferschicht innerhalb der Näpfchen überhaupt zur Geltung zu bringen. Im Bereich der Stege ergibt sich daher eine schlechte Tragfähigkeit.From US-A 4 601 242 an offset screen roller results, in which a screened steel jacket is provided with an inner copper plating and an outer ceramic plating located above it. This is just a very thin, porous ceramic layer that is subject to the risk of breaking through. The ceramic layer mentioned must be porous in order to bring out the effect of the copper layer underneath within the wells. This results in poor load-bearing capacity in the area of the webs.

Die GB-A 2 049 102 zeigt eine Rasterwalze mit einem auf einem Stahlkern aufgenommenen, keramischen Mantel, der graviert ist. Die Näpfchen sind hierbei jedoch nicht oberflächenbeschichtet. Die Oberfläche im Bereich der Näpfchen erweist sich hierbei daher als feuchtmittelfreundlich, was sich ungünstig auf die Haftung der Farbe in den Näpfchen und die Füllung der Näpfchen mit Farbe auswirken kann. Die Folge davon können Schwankungen der jeweil übertragenen Farbmenge und damit Farbdichte-Schwankungen im Druckbild sein.GB-A 2 049 102 shows an anilox roller with a ceramic jacket that is engraved on a steel core. However, the cells are not surface-coated. The surface in the area of the wells therefore proves to be moisture-friendly, which can have an unfavorable effect on the adhesion of the color in the wells and the filling of the wells with paint. The result of this can be fluctuations in the amount of ink transferred and thus fluctuations in color density in the printed image.

Hiervon ausgehend ist es daher die Aufgabe der vorliegenden Erfindung, eine Rasterwalze gattungsgemäßer Art mit einfachen und kostengünstigen Mitteln so zu verbessern, daß unter Beibehaltung der Vorteile des gattungsgemäßen Standes der Technik die erzielbaren Standzeiten noch verlängert werden.Based on this, it is therefore the task of the present one Invention to improve an anilox roller of the generic type with simple and inexpensive means so that the achievable service life can be extended while maintaining the advantages of the generic prior art.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß die Näpfchen als mit einer hydrophoben Oberflächenbeschichtung versehene Ausnehmungen einer aus hartkeramischem Material bestehenden, umfangsseitigen Beschichtung des Stahlkerns ausgebildet sind, die an der Oberfläche graviert ist und eine Dicke größer als die Näpfchentiefe aufweist.This object is achieved in that the cells are designed as recesses provided with a hydrophobic surface coating of a hard ceramic material, peripheral coating of the steel core, which is engraved on the surface and has a thickness greater than the depth of the cells.

Diese Maßnahmen ergeben Stege, die abgesehen von der hydrophoben Beschichtung durch und durch aus hartkeramischem Material bestehen. Es ergeben sich daher eine hohe Tragfähigkeit und Verschleißfestigkeit. Dennoch kann sich in den Näpfchen kein trennender Wasserfilm etablieren. Trotz Verwendung von durch und durch aus hartkeramischem Material bestehenden Stegen ergeben sich daher eine gute Mitnahme der Farbe und dementsprechend eine ausgezeichnete Farbübertragung.These measures result in webs which, apart from the hydrophobic coating, consist of hard ceramic material. This results in a high load-bearing capacity and wear resistance. However, no separating water film can establish itself in the wells. Despite the use of bridges made of hard ceramic material through and through, this results in good entrainment of the paint and, accordingly, excellent paint transfer.

Vorteilhafte Ausgestaltungen und zweckmäßige Fortbildungen der übergeordneten Maßnahmen sind in den Unteransprüchen angegeben.Advantageous refinements and appropriate further training of the higher-level measures are specified in the subclaims.

Nachstehend wird ein Ausführungsbeispiel der Erfindung anhand der Zeichnung näher erläutert. Hierbei zeigen:

Figur 1
eine schematische Darstellung eines Kurzfarbwerks für eine Offsetdruckmaschine,
Figur 2
eine Teilansicht der Rasterwalze im Schnitt und
Figuren 3, 4
der Anordnung nach Figur 2 vorhergehende Fertigungsstufen in Figur 2 entsprechender Darstellung.
An exemplary embodiment of the invention is explained in more detail below with reference to the drawing. Here show:
Figure 1
1 shows a schematic representation of a short inking unit for an offset printing press,
Figure 2
a partial view of the anilox roller in section and
Figures 3, 4
the arrangement according to FIG. 2 preceding production stages in FIG. 2 corresponding representation.

Das der Figur 1 zugrundeliegende Kurzfarbwerk besteht aus einer mit einem mit harten Offsetdruckplatten belegbaren Plattenzylinder 1 zusammenwirkenden, gummierten Auftragwalze 2 gleichen Durchmessers wie der Plattenzylinder 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 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 plates and which has the same diameter as the plate cylinder and an anilox roller 3 which cooperates with the applicator roller 2. The applicator roller 2 acts simultaneously with a dampening unit 4 together. The circumference of the anilox roller 3 is provided with cups 5 indicated in an enlarged manner in FIG. 1 and the webs 6 delimiting them.

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 mittels einer in Figur 1 als Ganzes mit 7 bezeichneten Kammerrakelanordnung. Diese besteht aus zwei mit negativem Anstellwinkel an der Rasterwalze 3 anliegenden Rakeln, die 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 by means of a chamber doctor blade arrangement designated as a whole in FIG. This consists of two doctor blades lying against the anilox roller 3 with a negative angle of attack, which delimit a chamber acted upon by ink between them.

Die Rasterwalze 3 besteht, wie am besten aus Figur 2 erkennbar ist, aus einem Stahlkern 8, welcher die seitlichen Lagerstummel aufweisen kann, und einer auf den Stahlkern 8 umfangsseitig aufgebrachten Beschichtung 9 aus hartkeramischem Material, in die die Näpfchen 5 eingelassen sind. Zur Bildung der hartkeramischen BeSchichtung kann Chromoxyd oder Aluminiumoxyd Verwendung finden. Materialien dieser Art können auf den Stahlkern 8 einfach im Spritzverfahren aufgetragen werden. Die Dicke der Beschichtung 9 beträgt etwa 150µ. Die Tiefe der Näpfchen 5 liegt in der Größenordnung zwischen 20µ bis 50µ. Die Dicke der Beschichtung 9 beträgt daher mindestens etwa das dreifache der Näpfchentiefe.The anilox roller 3, as can best be seen from FIG. 2, consists of a steel core 8, which can have the side bearing stubs, and a coating 9 made of hard ceramic material on the circumference of the steel core 8, into which the cups 5 are embedded. Chromium oxide or aluminum oxide can be used to form the hard ceramic coating. Materials of this type can easily be applied to the steel core 8 by spraying. The thickness of the coating 9 is approximately 150μ. The depth of the cells 5 is of the order of magnitude between 20µ to 50µ. The thickness of the coating 9 is therefore at least about three times the depth of the cells.

Beim Eingravieren der Näpfchen 5 in die aus hartkeramischem Material, wie Chromoxyd oder Aluminiumoxyd oder dergleichen, bestehende Beschichtung 9 ergeben sich automatisch aus hartkeramischem Material bestehende Stege 6 zwischen den Näpfchen 5. Die Stege 6 bestehen dementsprechend aus einem hochfesten Material, so daß eine hohe Verschleißsicherheit erreicht wird. Um trotz der hohen Affinität des hartkeramischen Materials zu Wasser das Entstehen eines Wasserfilms im Bereich der Näpfchen zu verhindern und eine gute Füllung der Näpfchen 5 mit Farbe zu gewährleisten, sind die Näpfchen 5, wie Figur 2 weiter erkennen läßt, mit einer Auskleidung 10 versehen, die aus wasserabstoßendem und Farbe annehmendem Material, beispielsweise aufgedampftem Kupfer, besteht, das gleichzeitig farb- und reinigungsmittelbeständig ist.When the cups 5 are engraved into the coating 9 made of hard-ceramic material, such as chromium oxide or aluminum oxide or the like, webs 6 between the cups 5, which consist of hard-ceramic material, automatically result. The webs 6 accordingly consist of a high-strength material, so that a high wear resistance is achieved. In order to prevent the formation of a water film in the area of the wells despite the high affinity of the hard ceramic material for water and to ensure good filling of the wells 5 with color, the wells 5 are provided with a lining 10, as can further be seen in FIG. which consists of water-repellent and color-accepting material, for example vapor-deposited copper, which is also resistant to color and cleaning agents.

Die hartkeramische Beschichtung 9 kann, wie weiter oben bereits erwähnt wurde, auf den Stahlkern 8 im Spritzverfahren aufgetragen werden. Nach einer derartigen Beschichtung ergibt sich ein Rohling, der der Figur 3 zugrundeliegenden Art. Sofern erforderlich, kann dieser Rohling zur Erzielung eines exakten Rundlaufs und eines exakten Durchmessers geschliffen werden. Anschließend werden die Näpfchen 5 in die Beschichtung 9 eingraviert, so daß sich der der Figur 4 zugrundeliegende Zustand ergibt. Die Gravur der hartkeramischen Beschichtung 9 soll mit Hilfe eines Laserstrahls erfolgen. Hiermit läßt sich eine hohe Graviergenauigkeit erreichen. Beim Eingravieren der Näpfchen 5 in die hartkeramische Beschichtung 9 ergeben sich, wie weiter oben bereits er wähnt wurde, automatisch die aus hartkeramischem Material bestehenden Stege 6. Im Anschluß an die Gravur wird der soweit bearbeitete Rohling umfangsseitig überschliffen und poliert bzw. geläppt, um die Stege 6 zu entgraten und die Oberfläche zu glätten. Diese Bearbeitungstufe liegt der Figur 4/zugrunde.The hard ceramic coating 9 can, as already mentioned above, be applied to the steel core 8 by spraying. Such a coating produces a blank of the type on which FIG. 3 is based. If necessary, this blank can be ground to achieve an exact concentricity and an exact diameter. The cups 5 are then engraved into the coating 9, so that the state underlying FIG. 4 results. The hard ceramic coating 9 should be engraved with the aid of a laser beam. This enables a high level of engraving accuracy to be achieved. When the cups 5 are engraved into the hard ceramic coating 9, as already stated above, they result was believed, the webs made of hard ceramic material 6 automatically. Following the engraving, the blank processed so far is ground on the circumference and polished or lapped in order to deburr the webs 6 and smooth the surface. This processing stage is based on FIG. 4 /.

Anschließend wird der der Figur 4 zugrundeliegende Rohling umfangsseitig mit einer feinen Schicht aus hydrophobem Werkstoff überzogen. Im dargestellten Ausführungsbeispiel soll hierzu filmartiger Kupferüberzug vorgesehen sein. Die Schichtdicke dieses Überzugs ist, wie Figur 2 weiter erkennen läßt, klein gegenüber der Schichtdicke der hartkeramischen Beschichtung 9 und beträgt etwa 4µ bis 5µ. Ein derartiger Überzug kann aufgedampft oder galvanisch aufgebracht werden oder dergleichen. Anstelle von Kupfer könnte auch Nickel oder Silikon oder Asphalt oder ein geeigneter Kunststoff in Form von Teflon oder Rilsan Verwendung finden. Silikon bzw. Asphalt können dabei im Streich- oder Spritzverfahren aufgebracht werden.The blank on which FIG. 4 is based is then coated on the circumference with a fine layer of hydrophobic material. In the illustrated embodiment, film-like copper plating should be provided for this. The layer thickness of this coating, as can further be seen in FIG. 2, is small compared to the layer thickness of the hard ceramic coating 9 and is approximately 4 μm to 5 μm. Such a coating can be vapor-deposited or applied galvanically or the like. Instead of copper, nickel or silicone or asphalt or a suitable plastic in the form of Teflon or Rilsan could also be used. Silicon or asphalt can be applied by brushing or spraying.

Dieser Überzug bedeckt zunächst auch die umfangsseitige Kopffläche der Stege 6. In diesem Bereich erfolgt jedoch während des Betriebs innerhalb kürzester Zeit eine Abtragung, so daß ein Abschleifen nach erfolgtem Überzug entfallen kann. Es wäre aber auch ohne weiteres denkbar, im Anschluß an den Überziehvorgang die Stege 6 kopfseitig soweit abzuschleifen, bis hartkeramisches Material hervortritt, so daß während des Betriebs von Anfang an konstante Verhältnisse zu erwarten wären. An der gegenüber der Umfangsfläche vertieft liegenden Fläche der Näpfchen 5 bleibt der hydrophobe Überzug erhalten und bildet dabei die hydrophobe Auskleidung 10.This coating initially also covers the circumferential head surface of the webs 6. In this area, however, abrasion takes place within a very short time during operation, so that grinding off after the coating has taken place can be dispensed with. However, it would also be readily conceivable to grind the webs 6 on the head side after the pulling-on process until hard ceramic material emerges, so that constant conditions would be expected from the start during operation. The hydrophobic coating is retained on the surface of the cups 5 that is recessed relative to the peripheral surface and thereby forms the hydrophobic lining 10.

Diese Auskleidung 10 verkleinert das Fassungsvermögen der zunächst in die hartkeramische Beschichtung 9 durch Laserstrahl eingravierten Näpfchen 5. Die in Figur 4 angedeutete, tatsächliche Gravurtiefe T muß dementsprechend um die Dicke der Auskleidung 10 tiefer als die Gravur einer herkömmlichen Rasterwalze sein, d. h. um die Dicke der Auskleidung 10 tiefer als die zur Erzielung des gewünschten Fassungsvermögens der mit der Auskleidung 10 versehenen Näpfchen 5 benötigten, in Figur 2 angedeuteten Näpfchentiefe t.This lining 10 reduces the capacity of the wells 5 which are initially engraved in the hard ceramic coating 9 by laser beam. The actual engraving depth T indicated in FIG. 4 must accordingly be deeper by the thickness of the lining 10 than the engraving of a conventional anilox roller, i. H. by the thickness of the lining 10 is deeper than the depth t indicated in FIG. 2 required to achieve the desired capacity of the wells 5 provided with the lining 10.

Im dargestellten Ausführungsbeispiel bestehen die hartkeramische Beschichtung 9 und der die Auskleidung 10 ergebende Überzug jeweils aus einer Schicht desselben Materials. Es wäre aber auch denkbar, die Beschichtung 9 und die Auskleidung 10 mehrschichtig auszubilden, wobei unterschiedliche Materialien Verwendung finden könnten, wodurch die gegenseitige Haftung beispielsweise der Beschichtung 9 auf dem Stahlkern 8 und des zur Bildung der Auskleidung 10 vorgesehenen Überzug auf der hartkeramischen Beschichtung 9 optimiert werden könnte.In the exemplary embodiment shown, the hard ceramic coating 9 and the coating that results in the lining 10 each consist of a layer of the same material. However, it would also be conceivable to form the coating 9 and the lining 10 in multiple layers, different materials being able to be used, as a result of which the mutual adhesion of the coating 9 on the steel core 8 and the coating provided for forming the lining 10 on the hard ceramic coating 9 is optimized could be.

Claims (9)

  1. A pitted roll for an inking unit associated with an offset printing press and more particularly a short inking unit, with a steel core (8) and a pitted surface having lands (6) and pits (5), which surface is adapted to cooperate with at least one doctor blade resting against its periphery, preferably in the form of chamber doctor blade (7), the surface of the lands (6) coming into contact with the doctor blade consisting of a material which is harder the steel core (8) and the pits (5) are provided with a hydrophobic surface coating (10), characterized in that the pits (5) are designed in the form of recesses, provided with a hydrophobic surface coating (10), in a peripheral coating (9) consisting of hard ceramic material, on the steel core (8) which coating is engraved on the surface and has a thickness which is greater than the depth of the pits.
  2. The pitted roll as claimed in claim 1, characterized in that the thickness of the surface coating (10) amounts to 4 to 5 microns.
  3. The pitted roll as claimed in either of the preceding claims, characterized in that the support coating (10) consists of a plastic (Teflon, Rislan) or copper.
  4. The pitted roll as claimed in any one of the preceding claims, characterized in that the surface coating (10) is a multi-layer one.
  5. The pitted roll as claimed in any one of the preceding claims, characterized in that the thickness of the hard ceramic coating (9) amounts to approximately 150 microns.
  6. The pitted roll as claimed in any one of the preceding claims, characterized in that the depth of the pits (5) at the most amounts to approximately 1/3 of the thickness of the hard ceramic coating (9).
  7. The pitted roll as claimed in any one of the preceding claims, characterized in that the depth of the pits (5) amounts to approximately 20 to 50 microns.
  8. The pitted roll as claimed in any one of the preceding claims, characterized in that the hard ceramic coating (9) consists of aluminum oxide or chromium oxide.
  9. The pitted roll as claimed in any one of the preceding claims, characterized in that the hard ceramic coating (9) is made of a multiplicity of layers.
EP88105687A 1987-04-16 1988-04-09 Engraved roller for an offset inking device, and manufacturing method for such an engraved roller Revoked EP0287002B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873713027 DE3713027A1 (en) 1987-04-16 1987-04-16 GRID ROLLER FOR AN OFFSET INKING MILL, AND METHOD FOR PRODUCING SUCH A GRID ROLLER
DE3713027 1987-04-16

Publications (3)

Publication Number Publication Date
EP0287002A2 EP0287002A2 (en) 1988-10-19
EP0287002A3 EP0287002A3 (en) 1989-06-28
EP0287002B1 true EP0287002B1 (en) 1994-11-02

Family

ID=6325830

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88105687A Revoked EP0287002B1 (en) 1987-04-16 1988-04-09 Engraved roller for an offset inking device, and manufacturing method for such an engraved roller

Country Status (2)

Country Link
EP (1) EP0287002B1 (en)
DE (2) DE3713027A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989005731A1 (en) * 1987-12-18 1989-06-29 Stanley Fellows Improved rollers
EP0406902A2 (en) * 1989-07-07 1991-01-09 Praxair S.T. Technology, Inc. Liquid transfer article having a vapor deposited protective polymer film
EP0511543A1 (en) * 1991-04-27 1992-11-04 KOENIG & BAUER-ALBERT AKTIENGESELLSCHAFT Roller for a printing machine
US5483886A (en) * 1992-08-28 1996-01-16 Koenig & Bauer Aktiengesellschaft Paper guide for web-fed press
US5832835A (en) * 1996-07-12 1998-11-10 Markem Corporation Soft doctoring cup

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3822692C2 (en) * 1988-07-05 1996-02-15 Kochsmeier Hans Hermann Anilox roller in an order work of a printing press
DE4036661C1 (en) * 1990-11-17 1992-06-17 Man Roland Druckmaschinen Ag, 6050 Offenbach, De
DE4408615C2 (en) * 1994-03-15 1996-01-11 Roland Man Druckmasch Cup roller within an application unit of a rotary printing press
DE4413236A1 (en) * 1994-04-15 1995-10-19 Heidelberger Druckmasch Ag Layered pressure cylinder
DE4424913C2 (en) * 1994-07-14 1996-07-11 Koenig & Bauer Albert Ag Structured ink transfer roller of a short inking unit of an offset rotary printing press
DE19957453C1 (en) * 1999-09-03 2001-02-01 Ruediger Woerz Application method for high viscosity ink in offset printing machine has ink supplied to mantle surface of ink roller via ink channels communicating with hollow interior of ink roller
US6982116B1 (en) 2000-02-18 2006-01-03 Praxair S.T. Technology, Inc. Coatings on fiber reinforced composites
DE10028478A1 (en) * 2000-06-08 2001-12-13 Roland Man Druckmasch Method of producing screen roller with surface cups involves shot-peening spherical particles, forming concave cavities and hardening edge layer.
US7419704B2 (en) 2005-08-18 2008-09-02 Praxair S. T. Technology, Inc. Coatings on fiber reinforced composites
DE102008007679B4 (en) * 2008-02-07 2016-05-25 manroland sheetfed GmbH Printing unit for a processing machine
CN102085743B (en) 2009-12-04 2014-04-09 海德堡印刷机械股份公司 Printing unit
US9522524B2 (en) 2015-02-02 2016-12-20 Eastman Kodak Company Method of multi-station flexographic printing including anilox roll with low surface energy zone

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US4603634A (en) * 1985-02-04 1986-08-05 Rockwell International Corporation Copper and nickel layered ink metering roller

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GB2049102A (en) * 1979-05-03 1980-12-17 Csi Corp Transfer roll
DE3117341C2 (en) * 1981-05-02 1988-07-07 Albert-Frankenthal Ag, 6710 Frankenthal Inking unit
JPS59204558A (en) * 1983-05-09 1984-11-19 Tokyo Kikai Seisakusho:Kk Mesh roll for planorgaphic printing
US4537127A (en) * 1984-09-12 1985-08-27 Rockwell International Corporation Black oxide lithographic ink metering roller
US4601242A (en) * 1985-02-04 1986-07-22 Rockwell International Corporation Copper and ceramic composite ink metering roller
DE3608286A1 (en) * 1985-04-03 1986-10-09 Winfried 7758 Meersburg Heinzel Method for the surface treatment of a printing machine cylinder, a printing machine cylinder and the use thereof
DE3525045A1 (en) * 1985-07-13 1987-01-22 Paul Sauer Druckwalzenfabriken Impression cylinder

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US4603634A (en) * 1985-02-04 1986-08-05 Rockwell International Corporation Copper and nickel layered ink metering roller

Non-Patent Citations (1)

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Title
Bundespatentgericht Beschluss 9W(Pat)111/8 vom 10.01.90 *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989005731A1 (en) * 1987-12-18 1989-06-29 Stanley Fellows Improved rollers
EP0406902A2 (en) * 1989-07-07 1991-01-09 Praxair S.T. Technology, Inc. Liquid transfer article having a vapor deposited protective polymer film
JPH03150195A (en) * 1989-07-07 1991-06-26 Union Carbide Coatings Services Technol Corp Liquid transfer article with deposit protection polymer film
EP0406902A3 (en) * 1989-07-07 1992-06-10 Union Carbide Coatings Service Technology Corp. Liquid transfer article having a vapor deposited protective polymer film
EP0511543A1 (en) * 1991-04-27 1992-11-04 KOENIG & BAUER-ALBERT AKTIENGESELLSCHAFT Roller for a printing machine
US5483886A (en) * 1992-08-28 1996-01-16 Koenig & Bauer Aktiengesellschaft Paper guide for web-fed press
US5832835A (en) * 1996-07-12 1998-11-10 Markem Corporation Soft doctoring cup

Also Published As

Publication number Publication date
DE3713027C2 (en) 1990-08-30
EP0287002A3 (en) 1989-06-28
DE3713027A1 (en) 1988-11-17
EP0287002A2 (en) 1988-10-19
DE3851972D1 (en) 1994-12-08

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