EP0709190B1 - Coated printing machine cylinders - Google Patents
Coated printing machine cylinders Download PDFInfo
- Publication number
- EP0709190B1 EP0709190B1 EP95114989A EP95114989A EP0709190B1 EP 0709190 B1 EP0709190 B1 EP 0709190B1 EP 95114989 A EP95114989 A EP 95114989A EP 95114989 A EP95114989 A EP 95114989A EP 0709190 B1 EP0709190 B1 EP 0709190B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- coating
- printing machine
- roller according
- machine roller
- lower layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F31/00—Inking arrangements or devices
- B41F31/26—Construction of inking rollers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F7/00—Rotary lithographic machines
- B41F7/20—Details
- B41F7/24—Damping devices
- B41F7/26—Damping devices using transfer rollers
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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
- B41N7/04—Shells for rollers of printing machines for damping 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
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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
- 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 printing press rolls according to the preamble of claim 1.
- High quality print is generally based on high quality, very dense and solid Types of paper carried out and partially required Dampening solution film thicknesses on the metering rollers of less than 4 ⁇ m. So far, printing requirements of this type have only been met are about the addition of alcohols to the dampening solution Reduction of surface tension. Most common is Isopropanol for this application and recently also various Glycols, which are marketed as so-called alcohol substitutes arrived. A typical dosage of isopropanol in the The dampening solution is between 10 and 15% by volume. These concentrations of alcohol in the dampening solution lead in larger offset printers, especially with high-performance roller machines, to ensure that the daily alcohol consumption on such machines several 100 l can be.
- the invention is therefore based on the object for Printing machine rollers, especially for the dampening system more modern Printing presses to create roller surfaces that stand out distinguish particularly hydrophilic properties.
- this object is achieved in that that the corresponding roller body is coated with an oxide ceramic coating are, which contains at least for the most part aluminum oxide and silicon oxide in the form of mullite.
- One or more can be coated with the coating according to the invention Rollers of the printing machine, especially the dampening unit become.
- the roller body in printing machines is generally made of structural steels exist without special corrosion protection, it has proven to be Proven useful with the coating according to the invention Mullite, the roller body with a metallic protective layer too coat the elements in comparatively high concentration Nickel, cobalt, iron, molybdenum, chrome, aluminum and yttrium in any, corresponding to the specific corrosion attack Combination contains.
- Both the metallic underlayer, i.e. H. the Protective layer, as well as the oxide ceramic, according to the invention Top layer, d. H. the mullite coating are preferred by thermal spraying, in particular plasma spraying, applied.
- Suitable processes for coating are the PVD processes, incl.
- Electron beam vapor deposition EBPVD
- CVD chemical vapor deposition
- galvanic processes that Diffusion coating processes from the gas phase or the pack
- Sintering the Sintering process
- Hippen hot isostatic pressing process
- Explosive plating and all reactive processes where reactive conversion of applied metal layers (Al, Si, Titan) an oxide layer is created.
- the metallic protective layer with a simultaneous adhesion promoter function is applied by thermal spraying, preferably in a thickness of approximately 0.2 mm, if the roller body consists of non-corrosion-protected structural steel.
- a layer thickness of the metallic protective layer with pure adhesion promoter function of approx. 70 ⁇ m is sufficient.
- the oxide ceramic coating according to the invention is then applied to roll cores coated in this way with a thickness of approximately 0.25 mm, likewise preferably by thermal spraying.
- a dampening roller coated in the manner described, for. B. metering roller, must subsequently to achieve their full functionality with appropriate hydrophilicity, z. B.
- the dampening system according to FIG. 1 is characterized by the Fountain solution 1 (water, slightly acid buffered, pH 5) in one Water box 2, from which the rubberized roller 3 the Dampening solution transport to the transfer roller 4 with the transported ceramic coating according to the invention.
- the transfer roller 4 results there over the entire Bale length is a thin, even film of dampening solution, which in this form transferred to the rubberized dampening roller and from there is transported directly to the printing plate cylinder 8.
- the dampening roller 5 stands with the inking unit on the Intermediate roller 6 in connection. For reasons of simplification, entire inking unit only one inking roller 7 in Fig. 1st shown.
- the invention is not limited to a roller arrangement as in Fig. 1, but it is applicable wherever technical Reasons a special hydrophilic surface property is required becomes.
- the roller body 9 can be made of any materials, such as. B. structural steels or stainless, higher alloyed steels. Of the Cross-section through the coating according to the invention characterized by the roller body 9, the surface of which, for. B. is roughened by abrasive blasting. Roughened on this Roller body surface is an adhesion promoter and against corrosion protective underlayer 10, e.g. B. by thermal spraying, applied. The roughness of this layer 10 with their Undercuts on the surface provides for the actual Functional ceramic 11, the mullite coating according to the invention, the Guarantee for sufficient liability.
- the functional ceramic 11 has Application by thermal spraying residual pores 12, which over the Layer thickness are evenly distributed. These pores 12 in the functional ceramic 11 can be sealed as described above be.
- the functional ceramic 11 has been smoothed to a roughness value of R z 2.0 2.0 ⁇ m before it is used on the surface 13 by grinding and polishing. Furthermore, it is possible to activate the surface 13 with a commercially available plate cleaner before it is used in the printing press. In this activated state, it is possible, for. B. a transfer roller with the coating according to the invention a uniform dampening film of z. B. to achieve only 4 microns without isopropanol in the dampening solution, so that an error-free high-quality print without dampening solution tear is achieved even in continuous operation.
- the layer thickness of the lower layer 10 can fluctuate between 50 ⁇ m and 1 mm, since it can also be used at the same time for the dimensional correction of the roller body diameter.
- the layer thickness of the functional ceramic 11 fluctuates between 0.1 mm and 1.0 mm, depending on the application.
Description
Die Erfindung betrifft Druckmaschinenwalzen gemäß dem Oberbegriff des Anspruchs 1.The invention relates to printing press rolls according to the preamble of claim 1.
In verschiedenen Bereichen der Anlagentechnik besteht ein Bedarf an Oberflächen, die leicht mit Wasser benetzbar sein müssen, also entsprechende hydrophile Eigenschaften aufweisen. In einer Offsetdruckmaschine hat z. B. das Feuchtwerk die Aufgabe, einen möglichst dünnen, gleichmäßig geschlossenen Feuchtmittelfilm auf den Druckplattenzylinder zu übertragen. Der Feuchtmitteltransport in einem Feuchtwerk erfolgt bei modernen Druckmaschinen z. B. über eine in einen Wasserkasten getauchte Walze, eine sogenannte Übertragungswalze und eine daran anschließende Feuchtauftragswalze, die direkt mit dem Druckplattenzylinder in Kontakt steht. Um mit einer derartigen Walzenanordnung einen möglichst dünnen, gleichmäßigen Feuchtmittelfilm auszubilden, sind entsprechend hydrophile Oberflächeneigenschaften notwendig. Hochwertiger Druck wird im allgemeinen auf hochwertigen, sehr dichten und festen Papiersorten durchgeführt und erfordert teilweise Feuchtmittelfilmdicken auf den Dosierwalzen von weniger als 4 µm. Drucktechnische Forderungen dieser Art konnten bislang nur erfüllt werden über die Zugabe von Akoholen zum Feuchtmittel zur Reduzierung der Oberflächenspannung. Am häufigsten verbreitet ist für diese Anwendung Isopropanol und seit neuestem auch verschiedene Glykole, die als sogenannte Alkoholersatzstoffe auf den Markt gekommen sind. Eine typische Dosierung von Isopropanol im Feuchtmittel liegt zwischen 10 und 15 Vol.-%. Diese Konzentrationen von Alkohol im Feuchtmittel führen in größeren Offsetdruckereien, insbesondere mit Hochleistungsrollenmaschinen, dazu, daß der tägliche Alkoholverbrauch an derartigen Maschinen mehrere 100 l betragen kann. Entsprechend dieser Situation sind-aus Gründen des Umweltschutzes und des Arbeitsschutzes gesetzgeberische Maßnahmen in Vorbereitung, die eine drastische Reduzierung der Benetzungshilfen in Feuchtmitteln in Form von Alkoholen oder Alkoholersatzstoffen fordern. Weiterhin ist davon auszugehen, daß auch in Zukunft die Qualitätsanforderungen an drucktechnische Erzeugnisse mit Sicherheit nicht zurückgehen werden, sondern eher noch gesteigert werden. Diese sich deutlich abzeichnende Konfliktsituation kann mit herkömmlichen Feuchtwalzenoberflächen mit Sicherheit nicht gelöst werden. Dem Stand der Technik entsprechend werden insbesondere auf Dosierwalzen galvanisch abgeschiedene Chromschichten verwendet, die vor ihrem Einsatz geschliffen und poliert werden. Weiterhin befinden sich in erheblichem Umfang auch geschliffene und polierte Edelstahloberflächen im Einsatz, die ebenfalls keine Reduzierung des Akloholanteils im Feuchtmittel ermöglichen.There is a need in various areas of plant engineering Surfaces that must be easily wettable with water, that is have appropriate hydrophilic properties. In a Offset printing machine has e.g. B. the dampening system the task, one as thin as possible, evenly closed dampening film on the Transfer plate cylinder. The dampening solution transport in a dampening system takes place in modern printing presses e.g. B. via a a roller immersed in a water box, a so-called Transfer roller and a subsequent dampening roller, which is in direct contact with the printing plate cylinder. To with such a roller arrangement as thin as possible, Forming a uniform dampening solution film is appropriate hydrophilic surface properties necessary. High quality print is generally based on high quality, very dense and solid Types of paper carried out and partially required Dampening solution film thicknesses on the metering rollers of less than 4 µm. So far, printing requirements of this type have only been met are about the addition of alcohols to the dampening solution Reduction of surface tension. Most common is Isopropanol for this application and recently also various Glycols, which are marketed as so-called alcohol substitutes arrived. A typical dosage of isopropanol in the The dampening solution is between 10 and 15% by volume. These concentrations of alcohol in the dampening solution lead in larger offset printers, especially with high-performance roller machines, to ensure that the daily alcohol consumption on such machines several 100 l can be. According to this situation - for the sake of Environmental protection and occupational safety legislative measures in Preparation that drastically reduces wetting aids in dampening solutions in the form of alcohols or alcohol substitutes demand. Furthermore, it can be assumed that the Quality requirements for printing technology products with certainty will not decrease, but rather will be increased. This the clearly emerging conflict situation can be with conventional Damp roller surfaces can not be solved with certainty. The According to the state of the art, in particular on metering rollers electroplated chrome layers used in front of their Insert can be ground and polished. Furthermore are in to a considerable extent also ground and polished Stainless steel surfaces in use, which also do not reduce the Allow alcohol content in the dampening solution.
Der Erfindung liegt daher die Aufgabe zugrunde, für Druckmaschinenwalzen, insbesondere für das Feuchtwerk moderner Druckmaschinen Walzenoberflächen zu schaffen, die sich durch besonders hydrophile Eigenschaften auszeichnen.The invention is therefore based on the object for Printing machine rollers, especially for the dampening system more modern Printing presses to create roller surfaces that stand out distinguish particularly hydrophilic properties.
Bei der vorliegenden Erfindung wird diese Aufgabe dadurch gelöst, daß die entsprechenden Walzenkörper mit einer oxidkeramischen Beschichtung überzogen sind, die zumindest zum größten Teil Aluminiumoxid und Siliziumoxid in Form von Mullit enthält.In the present invention, this object is achieved in that that the corresponding roller body is coated with an oxide ceramic coating are, which contains at least for the most part aluminum oxide and silicon oxide in the form of mullite.
In vorteilhafter Weise ist es möglich, Titanoxid und/oder Chromoxid dem Material für die Beschichtung beizufügen. In Verbindung mit einer derartigen Beschichtung ergibt sich für das Feuchtmittel, selbst bei völliger Alkoholfreiheit, eine außerordentlich gute Benetzbarket, die sich meßtechnisch in Form einer Randwinkelbestimmung (Benetzungswaage) feststellen läßt und zu Randwinkeln, z. B. für destilliertes Wasser, von deutlich unter 30° führt. Vergleichbare Oberflächenrauhigkeiten vorausgesetzt, zeigt unter gleichen Bedingungen eine dem Stand der Technik entsprechende Hartchromschicht einen Randwinkel von nahezu 50° und eine Edelstahloberfläche einen Randwinkel von nahezu 70°. Die extreme Benetzbarkeit der erfindungsgemäßen Beschichtung hat zur Folge, daß sie auch ohne oberflächenentspannende Zusätze von Alkohol oder Alkoholersatzstoffen im Feuchtmittel zu extrem dünnen und gleichmäßigen Feuchtmittelfilmen führt.It is advantageously possible to use titanium oxide and / or chromium oxide to be attached to the material for the coating. Combined with such a coating results for the dampening solution, an extraordinarily good one even with complete absence of alcohol Wettability, which is metrologically in the form of a Contact angle determination (wetting balance) can be determined and allowed Contact angles, e.g. B. for distilled water, well below 30 ° leads. Assuming comparable surface roughness, shows under the same conditions a state of the art Hard chrome layer a contact angle of almost 50 ° and a Stainless steel surface has a contact angle of almost 70 °. The extreme The result of the wettability of the coating according to the invention is that even without surface-releasing additives of alcohol or Alcohol substitutes in the dampening solution are extremely thin and leads even dampening solution films.
Mit der erfindungsgemäßen Beschichtung können eine oder mehrere Walzen der Druckmaschine, insbesondere des Feuchtwerks versehen werden.One or more can be coated with the coating according to the invention Rollers of the printing machine, especially the dampening unit become.
Je nach Konstruktionsart des Feuchtwerkes ist es erfahrungsgemäß besonders vorteilhaft, die Übertragungswalze zu beschichten.Depending on the type of construction of the dampening system, it is experience particularly advantageous to coat the transfer roller.
Da die Walzenkörper in Druckmaschinen im allgemeinen aus Baustählen ohne besonderen Korrosionsschutz bestehen, hat es sich als zweckmäßig erwiesen, vor der erfindungsgemäßen Beschichtung mit Mullit, den Walzenkörper mit einer metallischen Schutzschicht zu überziehen, die in vergleichsweise hoher Konzentration die Elemente Nickel, Kobalt, Eisen, Molybdän, Chrom, Aluminium und Yttrium in beliebiger, dem spezifischen Korrosionsangriff entsprechender Kombination enthält. Sowohl die metallische Unterschicht, d. h. die Schutzschicht, als auch die oxidkeramische, erfindungsgemäße Deckschicht, d. h. die Mullit-Beschichtung, werden vorzugsweise durch thermisches Spritzen, insbesondere Plasmaspritzen, aufgetragen. Weitere, für die Herstellung der erfindungsgemäßen Beschichtung geeignete Verfahren sind die PVD-Verfahren, incl. Elektronenstrahlbedampfen (EBPVD), die CVD-Verfahren, die plasmaunterstützten CVD-Verfahren, die galvanischen Verfahren, die Diffusionsbeschichtungsverfahren aus der Gasphase oder dem Pack, die Sinterverfahren, die Heißisostatpreßverfahren (Hippen), Sprengplattieren, und alle Reaktivverfahren, bei denen durch reaktive Umwandlung aufgebrachter Metallschichten (Al, Si, Titan) eine Oxidschicht entsteht. Since the roller body in printing machines is generally made of structural steels exist without special corrosion protection, it has proven to be Proven useful with the coating according to the invention Mullite, the roller body with a metallic protective layer too coat the elements in comparatively high concentration Nickel, cobalt, iron, molybdenum, chrome, aluminum and yttrium in any, corresponding to the specific corrosion attack Combination contains. Both the metallic underlayer, i.e. H. the Protective layer, as well as the oxide ceramic, according to the invention Top layer, d. H. the mullite coating, are preferred by thermal spraying, in particular plasma spraying, applied. Further, for the production of the invention Suitable processes for coating are the PVD processes, incl. Electron beam vapor deposition (EBPVD), the CVD process that plasma-assisted CVD processes, the galvanic processes that Diffusion coating processes from the gas phase or the pack, the Sintering process, the hot isostatic pressing process (Hippen), Explosive plating, and all reactive processes where reactive conversion of applied metal layers (Al, Si, Titan) an oxide layer is created.
Die metallische Schutzschicht mit gleichzeitiger Haftvermittlerfunktion wird durch thermisches Spritzen vorzugsweise in einer Dicke von ca. 0,2 mm aufgetragen, wenn der Walzenkörper aus nicht korrosionsgeschütztem Baustahl besteht. Bei der Verwendung von Edelstahlkernen ist eine Schichtdicke der metallischen Schutzschicht mit reiner Haftvermittlerfunktion von ca. 70 µm ausreichend. Auf derart beschichtete Walzenkerne wird anschließend die erfindungsgemäße oxidkeramische Beschichtung mit einer Dicke von ca. 0, 25 mm, ebenfalls vorzugsweise durch thermisches Spritzen, aufgetragen. Eine in der beschriebenen Weise beschichtete Feuchtwalze, z. B. Dosierwalze, muß in der Folge zur Erzielung ihrer vollen Funktionstüchtigkeit mit entsprechender Hydrophilie, z. B. noch durch Maßschleifen und Polieren, auf einen Oberflächenrauhigkeitswert von Rz ≤ 4 µm, vorzugsweise Rz ≤ 2 µm, bearbeitet werden. Da thermisch gespritzte Schichten verfahrensbedingt immer durch eine gewisse Restporosität gekennzeichnet sind, die durch den Schleif- und Polierprozeß geöffnet werden können, hat sich eine porenverschließende Nachbehandlung als zweckmäßig erwiesen. Als Porenverschlußmittel sind hydrophile Polymere (z. B. Polyvenylalkohol) geeignet. Insbesondere ist vorgesehen, die geschliffene, polierte und versiegelte Feuchtwalze mit der erfindungsgemäßen oxidkeramischen Funktionsschicht vor ihrem Einbau in eine Druckmaschine mit einem handelsüblichen Reinigungsmittel, wie z. B. einem Plattenreiniger, abzureiben. Eine derartige Oberflächenaktivierung führt sofort zur vollen Ausbildung der hydrophilen Eigenschaften der erfindungsgemäß beschichteten Feuchtwalze. In diesem Zustand ergibt sich auf der Walzenoberfläche ein Randwinkel gegenüber dem beim Druckprozeß einzusetzenden Feuchtmittel (Wasser mit einem Pufferzusatz, der den pH-Wert bei 5 hält) von deutlich unter 30°.The metallic protective layer with a simultaneous adhesion promoter function is applied by thermal spraying, preferably in a thickness of approximately 0.2 mm, if the roller body consists of non-corrosion-protected structural steel. When using stainless steel cores, a layer thickness of the metallic protective layer with pure adhesion promoter function of approx. 70 µm is sufficient. The oxide ceramic coating according to the invention is then applied to roll cores coated in this way with a thickness of approximately 0.25 mm, likewise preferably by thermal spraying. A dampening roller coated in the manner described, for. B. metering roller, must subsequently to achieve their full functionality with appropriate hydrophilicity, z. B. still by dimensional grinding and polishing, to a surface roughness value of R z ≤ 4 µm, preferably R z ≤ 2 µm, processed. Since thermally sprayed layers are always characterized by a certain residual porosity due to the process, which can be opened by the grinding and polishing process, a pore-closing aftertreatment has proven to be expedient. Hydrophilic polymers (e.g. polyvinyl alcohol) are suitable as pore sealing agents. In particular, it is provided that the ground, polished and sealed dampening roller with the oxide ceramic functional layer according to the invention before it is installed in a printing press with a commercially available cleaning agent, such as. B. a plate cleaner to rub. Such surface activation immediately leads to the full formation of the hydrophilic properties of the dampening roller coated according to the invention. In this state, there is a contact angle on the roller surface with the dampening solution to be used in the printing process (water with a buffer additive which maintains the pH at 5) of well below 30 °.
Die Erfindung wird durch die schematische Zeichnung anhand eines Ausführungsbeispieles wie folgt veranschaulicht:
- Fig. 1
- zeigt die Walzenanordnung in einem in Offsetdruckmaschinen weit verbreiteten Feuchtungssystem,
- Fig. 2
- zeigt eine Übertragungswalze aus diesem Feuchtungssystem mit der erfindungsgemäßen Beschichtung,
- Fig. 3
- zeigt einen Querschliff zur Walzenoberfläche der Übertragungswalze nach Fig. 2 mit einer Darstellung des Schichtaufbaus.
- Fig. 1
- shows the roller arrangement in a dampening system widely used in offset printing machines,
- Fig. 2
- shows a transfer roller from this dampening system with the coating according to the invention,
- Fig. 3
- shows a cross section to the roller surface of the transfer roller of FIG. 2 with an illustration of the layer structure.
Das Feuchtungssystem gemäß der Fig. 1 ist gekennzeichnet durch das
Feuchtmittel 1 (Wasser, schwach sauer gepuffert, pH 5) in einem
Wasserkasten 2, aus dem die gummierte Tauchwalze 3 den
Feuchtmitteltransport zur Übertragungswalze 4 mit dem
erfindungsgemäßen Keramiküberzug transportiert. Durch die
außergewöhnliche Hydrophilie der erfindungsgemäßen Beschichtung auf
der Übertragungswalze 4 ergibt sich dort über der gesamten
Ballenlänge ein dünner, gleichmäßiger Feuchtmittelfilm, der in
dieser Form auf die gummierte Feuchtauftragswalze übertragen und von
dort direkt auf den Druckplattenzylinder 8 weitertransportiert wird.
Die Feuchtauftragswalze 5 steht mit dem Farbwerk über die
Zwischenwalze 6 in Verbindung. Aus Gründen der Vereinfachung ist vom
gesamten Farbwerk nur eine Farbauftragswalze 7 in Fig. 1
dargestellt. In dieser beispielhaften Walzenanordnung führt die
Beschichtung der Übertragungswalze 4 mit der erfindungsgemäßen
Keramikschicht dazu, daß ohne den zur Zeit typischen
Isopropanolgehalt im Feuchtmittel von 10 - 15 Vol. % mit gleicher
Qualität wie bisher gedruckt werden kann. Dies hat für den Betrieb
der Druckmaschine nicht nur zur Konsequenz, daß kostengünstiger
produziert werden kann, sondern es werden auch die für
Druckereibetriebe typischen hohen Emissionswerte für
Kohlenwasserstoffe am Arbeitsplatz (MAK-Werte) und dem Abwasser
drastisch gesenkt. The dampening system according to FIG. 1 is characterized by the
Fountain solution 1 (water, slightly acid buffered, pH 5) in one
Die Erfindung ist nicht beschränkt auf eine Walzenanordnung wie in Fig. 1, sondern sie ist überall anwendbar, wo aus technischen Gründen eine besondere hydrophile Oberflächeneigenschaft gefordert wird.The invention is not limited to a roller arrangement as in Fig. 1, but it is applicable wherever technical Reasons a special hydrophilic surface property is required becomes.
In Fig. 2 und 3 ist die mit der erfindungsgemäßen Beschichtung
versehene Übertragungswalze aus Fig. 1 dargestellt. Der Walzenkörper
9 kann aus beliebigen Materialien, wie z. B. Baustählen oder
rostfreien, höher legierten Stählen, hergestellt sein. Der
Querschliff durch die erfindungsgemäße Beschichtung ist
gekennzeichnet durch den Walzenkörper 9, dessen Oberfläche z. B.
durch Abrasivstrahlen aufgerauht ist. Auf diese aufgerauhte
Walzenkörperoberfläche ist eine haftvermittelnde und vor Korrosion
schützende Unterschicht 10, z. B. durch thermisches Spritzen,
aufgetragen. Die Rauhigkeit dieser Schicht 10 mit ihren
Hinterschneidungen an der Oberfläche bietet für die eigentliche
Funktionskeramik 11, der erfindungsgemäßen Mullit-Beschichtung, die
Gewähr für ausreichende Haftung. Die Funktionskeramik 11 weist bei
Aufbringung durch thermisches Spritzen Restporen 12, die über der
Schichtdicke gleichmäßig verteilt vorliegen, auf. Diese Poren 12 in
der Funktionskeramik 11 können wie vorgehend beschrieben versiegelt
sein.2 and 3 is that with the coating according to the invention
provided transfer roller shown in Fig. 1. The
Die Funktionskeramik 11 ist vor ihrem Einsatz an der Oberfläche 13
durch Schleifen und Polieren bis auf einen Rauhigkeitswert von Rz ≤
2.0 µm geglättet worden. Weiterhin ist es möglich, die Oberfläche 13
vor ihrem Einsatz in der Druckmaschine mit einem handeslüblichen
Plattenreiniger zu aktivieren. In diesem aktivierten Zustand ist es
möglich, auf der gesamten Ballenfläche z. B. einer
Übertragungswalze, mit der erfindungsgemäßen Beschichtung einen
gleichmäßigen Feuchtmittelfilm von z. B. nur 4 µm auch ohne
Isopropanol im Feuchtmittel zu erzielen, so daß ein fehlerfreier
hochwertiger Druck ohne Feuchtmittelriß auch im Dauerbetrieb
erreicht wird. Die Schichtdicke der Unterschicht 10 kann zwischen
50 µm und 1 mm schwanken, da sie auch gleichzeitig zur maßlichen
Korrektur des Walzenkörperdurchmessers mit herangezogen werden kann.
Die Schichtdicke der Funktionskeramik 11 schwankt je nach Anwendung
zwischen 0,1 mm und 1,0 mm.The functional ceramic 11 has been smoothed to a roughness value of R z 2.0 2.0 μm before it is used on the
Claims (18)
- Printing machine roller, in particular a dampening roller (4), having an oxide-ceramic coating (11) over the entire curved surface of the roller body, characterised in that the oxide-ceramic coating (11) contains, at least for the most part, aluminium oxide and silicon oxide in the form of mullite.
- Printing machine roller according to claim 1, characterised in that in addition the coating (11) contains titanium oxide and/or chromium oxide.
- Printing machine roller according to claim 1, characterised in that the coating (11) is applied by thermal spraying.
- Printing machine roller according to claim 1, characterised in that the coating (11) is applied on a lower layer (10) which contains the elements nickel and/or cobalt and/or iron and/or molybdenum and/or chromium and/or aluminium and/or yttrium.
- Printing machine roller according to one of the preceding claims, characterised in that the coating (11) has a thickness of 0.1 mm - 1.0 mm, preferably 0.5 mm, whilst the lower layer (10) has a thickness of 0.05 mm - 1.0 mm.
- Printing machine roller according to one of the preceding claims, characterised in that the coating (11) has a surface roughness of Rz≤4µm, preferably Rz≤2.0µm.
- Printing machine roller according to claims 1 and 4, characterised in that the coating (11) and/or the lower layer (10) is a PVD (Physical Vapour Deposition) layer.
- Printing machine roller according to claims 1 and 4, characterised in that the coating (11) and/or the lower layer (10) is an EBPVD (Electron Beam Vapour Deposition) layer.
- Printing machine roller according to claims 1 and 4, characterised in that the coating (11) and/or the lower layer (10) is a CVD (Chemical Vapour Deposition) layer.
- Printing machine roller according to claims 1 and 4, characterised in that the coating (11) and/or the lower layer (10) is a plasma CVD layer (plasma-supported CVD).
- Printing machine roller according to claims 1 and 4, characterised in that the coating (11) and/or the lower layer (10) are applied by a galvanic process.
- Printing machine roller according to claims 1 and 4, characterised in that the coating (11) and/or the lower layer (10) are applied by a diffusion coating process.
- Printing machine roller according to claims 1 and 4, characterised in that the coating (11) and/or the lower layer (10) are applied by a sintering process.
- Printing machine roller according to claims 1 and 4, characterised in that the coating (11) and/or the lower layer are applied by a hot isostatic pressing process (Hipps).
- Printing machine roller according to claims 1 and 4, characterised in that the coating (11) and/or the lower layer (10) are applied by blast plating.
- Printing machine roller according to claim 1, characterised in that the coating (11) is applied by a reactive process in which an oxide layer is produced by reactive conversion of previously applied metal layers of aluminium and silicon and/or titanium and/or chromium.
- Printing machine roller according to claim 1, characterised in that after the coating process the surface of the coating (11) is smoothed by grinding and/or polishing.
- Printing machine roller according to claim 1, characterised in that in order to reduce porosity the coating (11) is sealed with a pore-closing means.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4434765A DE4434765A1 (en) | 1994-09-29 | 1994-09-29 | Coated printing machine rollers |
| DE4434765 | 1994-09-29 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0709190A1 EP0709190A1 (en) | 1996-05-01 |
| EP0709190B1 true EP0709190B1 (en) | 1999-08-18 |
Family
ID=6529478
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP95114989A Expired - Lifetime EP0709190B1 (en) | 1994-09-29 | 1995-09-23 | Coated printing machine cylinders |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0709190B1 (en) |
| DE (2) | DE4434765A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19653911C2 (en) * | 1996-12-21 | 2003-03-27 | Roland Man Druckmasch | Printing machine roller with a color-friendly coating on the roll surface of the roller core, in particular ink roller |
| DE102008014034A1 (en) * | 2008-03-13 | 2009-09-24 | Coatec Gesellschaft für Oberflächenveredelung mbH | Roll body with a roll cover for improved color water emulsion formation in printing units of wet offset and process for its production |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3168037A (en) * | 1960-05-02 | 1965-02-02 | Harold P Dahlgren | Means for dampening lithographic offset printing plates |
| DE2348717B1 (en) * | 1973-09-28 | 1975-03-20 | Weitmann & Konrad | Process for increasing the wettability of dampening agent-carrying surfaces in printing machines |
| US4069570A (en) * | 1975-01-27 | 1978-01-24 | Adamovske Strojirny, Narodni Podnik | Cylinders and rollers for printing machines |
| DE2602277A1 (en) * | 1975-01-27 | 1976-07-29 | Adamovske Strojirny Np | PRINTING MACHINE CYLINDERS |
| DD154081A1 (en) * | 1980-12-15 | 1982-02-24 | Heiner Fink | METHOD FOR PRODUCING SURFACE COATINGS FOR WET ROLLERS |
| JPH0698851B2 (en) * | 1988-06-15 | 1994-12-07 | 新日本製鐵株式会社 | Damping water supply roller for lithographic printing machine |
| US4932319A (en) * | 1988-10-26 | 1990-06-12 | Ryco Graphic Manufacturing, Inc. | Spray dampening system for offset press |
| DE4321183C2 (en) * | 1992-07-09 | 2002-12-12 | Heidelberger Druckmasch Ag | Dampening roller of a printing machine |
| DE4229700C2 (en) * | 1992-09-05 | 1997-02-13 | Heidelberger Druckmasch Ag | Dampening roller for a printing machine and process for coating it |
| DE4242620A1 (en) * | 1992-12-17 | 1994-06-23 | Coatec Ges Fuer Oberflaechenve | Printing machine roller with hydrophilic surface |
-
1994
- 1994-09-29 DE DE4434765A patent/DE4434765A1/en not_active Withdrawn
-
1995
- 1995-09-23 EP EP95114989A patent/EP0709190B1/en not_active Expired - Lifetime
- 1995-09-23 DE DE59506636T patent/DE59506636D1/en not_active Expired - Lifetime
Non-Patent Citations (1)
| Title |
|---|
| Ullmann's Encyclopedia of Industrial Chemistry, 5. Auflage, Band 23, Seiten 694 bis 696 * |
Also Published As
| Publication number | Publication date |
|---|---|
| DE59506636D1 (en) | 1999-09-23 |
| EP0709190A1 (en) | 1996-05-01 |
| DE4434765A1 (en) | 1996-04-04 |
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