EP2454099B1 - Dampening system rollers - Google Patents

Dampening system rollers Download PDF

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Publication number
EP2454099B1
EP2454099B1 EP10735239.5A EP10735239A EP2454099B1 EP 2454099 B1 EP2454099 B1 EP 2454099B1 EP 10735239 A EP10735239 A EP 10735239A EP 2454099 B1 EP2454099 B1 EP 2454099B1
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EP
European Patent Office
Prior art keywords
dampening
roller
layer
outer layer
dampening unit
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EP10735239.5A
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German (de)
French (fr)
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EP2454099A1 (en
Inventor
Thorsten Pfeil
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Felix Bottcher & Co KG GmbH
Felix Boettcher GmbH and Co KG
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Felix Bottcher & Co KG GmbH
Felix Boettcher GmbH and Co KG
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Application filed by Felix Bottcher & Co KG GmbH, Felix Boettcher GmbH and Co KG filed Critical Felix Bottcher & Co KG GmbH
Priority to SI201030806T priority Critical patent/SI2454099T1/en
Priority to EP10735239.5A priority patent/EP2454099B1/en
Priority to PL10735239T priority patent/PL2454099T3/en
Publication of EP2454099A1 publication Critical patent/EP2454099A1/en
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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
    • 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 present invention relates to a roller in the dampening unit, such as dampening drive roller, wet transfer roller or dampening roller and their use in a dampening unit.
  • Offset printing is an indirect printing process used in newspaper, magazine and catalog printing.
  • a printing plate is created, typically a thin aluminum plate. This is clamped on a plate cylinder and is in the printing machine with inking and dampening in conjunction. Lipophilic areas of the printing form accept ink while hydrophilic areas remain colorless.
  • the ink is transferred to the blanket mounted on a blanket cylinder or offset cylinder.
  • the blanket cylinder then transfers the ink to the medium to be printed using a counter-pressure cylinder or another blanket cylinder.
  • Typical dampening units include one or more rollers, often having soft surface, eg, elastomeric, rollers in contact with one or more hard rollers or other elastomer-related rollers.
  • a soft dampening roller is in direct connection with the dampening solution supply. She "draws” fountain solution from the supply and transfers it to a hard roller. The hard roller transfers the dampening solution film to the dampening roller.
  • the hard roller is referred to as dampening drive roller, as wet transfer roller or as a wet roller. These three terms are used synonymously in this text.
  • the wet-type dipping roller is a hard roller which first transfers the dampening solution to a soft roller (wet transfer roller or dampening roller), which then transfers it to a hard dampening roller or wet transfer roller, which finally transfers to the dampening roller.
  • dampening units there are further rollers, e.g. Rider rollers, which serve to smooth the dampening solution film or bridge rollers, which establish a contact between inking and dampening unit.
  • rollers e.g. Rider rollers, which serve to smooth the dampening solution film or bridge rollers, which establish a contact between inking and dampening unit.
  • rollers are hard rollers, i. Rollers without elastomer cover.
  • dampening unit As materials for the surfaces of hard rollers in the dampening unit, such as dampening drive rollers or wet transfer rollers, chromium, ceramic and stainless steel are common.
  • DE-AS-1257170 describes processes for hydrophilizing dampening rollers by preparing a coating containing a vinyl silane.
  • the outer layer of the roll is formed by a silane.
  • DE60120444T2 discloses dummy plates which are roughened and anodized aluminum plates. Such plates are mounted there on rollers where no ink to be transferred to the web to be printed.
  • US 2003/0045412 discloses a laser engravable embossing roll that can support a fluorinated outer layer.
  • GB 1 247 734 discloses articles having a nickel layer followed by a fluorocarbon layer and then sintered.
  • DE 2 353 593 discloses a method for improving the properties of anodic oxide films on aluminum or aluminum alloys.
  • EP 1 674 243 A2 discloses an apparatus and method for making three-dimensional models.
  • a roller can be used, which has an anodized aluminum surface.
  • US 6,290,834 discloses a transfer roller for transporting liquids with a hard ceramic coating.
  • dampening roller associated with the printing form is wetted during operation with printing ink or an ink emulsion. It then transmits this successively backwards to the other rollers in the dampening unit, both on the wet dipping or dampening metering roller and on the dampening roller or wet transfer roller, so that it can even come to contamination of the dampening solution in the end.
  • the carryover of the paint leads over time to color build-up on the surfaces of the dampening rollers and impairment of the printing process. As a rule, this will stop the printing process and require cleaning.
  • the dampening roller according to the invention show a reduced color cleavage, improved and more uniform dampening solution transfer and / or easier washability.
  • a roller which has an outer layer which is an aluminum hard oxoxide or a layer of chemical nickel or an aluminum oxide layer obtainable by plasma-chemical anodic oxidation is used as the hard roller in the dampening unit, in particular dampening drive roller, dampening roller or wet transfer roller.
  • Hard oxoates of aluminum are known to the person skilled in the art. They are obtained by anodizing in a cold, acidic electrolyte. The electric current forms a protective aluminum oxide layer on the surface.
  • aluminum and aluminum alloys can be used as starting material.
  • a roll is used in which the entire roll (monolithic) is made of aluminum.
  • the roll includes a core of another material, such as a steel core, a carbon fiber or glass fiber core, or the like, and an outer shell of aluminum that is hard-anodized.
  • PTFE polytetrafluoroethylene
  • silicon carbide particles are incorporated into the outer layer during production of the anodized material.
  • Chemical nickel is a process in which electroless nickel is deposited from a solution of nickel ions and a reducing agent (typically hypophosphite).
  • a reducing agent typically hypophosphite
  • a core selected from steel cores, aluminum cores and carbon fiber cores is used. It is also possible in this case that in the outer layer of PTFE, other fluorine-containing polymer or Siliziumcarbidpitate be stored.
  • phosphorus is also typically incorporated into the layer.
  • Another suitable outer layer is obtained by a plasma-chemical coating.
  • a workpiece with an external power source can be connected as the anode.
  • oxygen plasma discharges on the workpiece surface, melts it, and forms two layers of oxide ceramics, which mainly consist of corundum and boehmite; see also EP 0 545 230 ,
  • the preferred layer thickness is 5 to 200, more preferably 20 to 100 ⁇ m, preferably 30 to 60 ⁇ m.
  • the aluminum hardoxates a roughness of the surface of Rz 0.1 to 100, preferably Rz 0.5 to 8 microns is particularly suitable.
  • the preferred layer thickness is 5 to 200, more preferably 20 to 100 ⁇ m, preferably 30 to 60 ⁇ m.
  • the aluminum oxides (corundum, boehmite) is a roughness of Surface of Ra 0.05 to 20.0 preferably Ra 0.1 to 2.0 microns particularly suitable.
  • the typical thickness is 2 to 40 ⁇ m, preferably 10 to 20 ⁇ m.
  • a roughness of Rz 0.1 to 100, preferably Rz 0.5 to 8 microns is particularly suitable.
  • Another embodiment of the invention is a dampening roller according to the invention, as described above, in which additionally a PTFE or fluorine-containing polymer layer is applied, i. a PTFE or other fluorine-containing polymers are not incorporated in the layer, but form a separate layer.
  • the invention relates to a dampening unit comprising at least one roller according to the invention and the use of the roller according to the invention as a roller, in particular dampening drive roller or wet transfer roller in a dampening unit.
  • the dampening roller according to the invention show good wet transfer performance with a reduction in color cleavage.
  • FIG. 1 shows schematically the structure of a four-roll dampening unit.
  • the wet dipping roller (5b) is a hard roller which first transfers the dampening solution to a soft roller (6), which then transfers it to a hard dampening drive roller, dampening roller (4) which transfers to the dampening roller (3) finally applies to the plate cylinder (1).
  • the plate cylinder is also in connection with the inking rollers (2).
  • FIG. 2 shows schematically the structure of a three-roll dampening unit.
  • a soft wet dipping roller (5a) is in direct connection with the dampening solution supply. It "draws” fountain solution from the supply and transfers it to a hard dampening roller or wet transfer roller (4).
  • Roller (4) transfers the dampening solution film onto the dampening applicator roll (3), which finally applies to the plate cylinder (1).
  • the plate cylinder is also in connection with the inking rollers (2).
  • An aluminum roller having a coating length of 1110 mm and a diameter of 125 mm was provided with a hard iron oxide layer of a thickness of 40 ⁇ m.
  • a three-roll dampening unit in a web offset press When used in a three-roll dampening unit in a web offset press, it exhibited very uniform dampening solution transfer and improved dampening solution transfer capacity (speed could be reduced by 10%) compared to a ceramic roller, while the color rejection was reduced.
  • An aluminum roller having a coating length of 530 mm and a diameter of 58 mm was provided with a hard iron oxide layer having a thickness of 40 ⁇ m.
  • a hard iron oxide layer having a thickness of 40 ⁇ m.
  • An aluminum roller with a coating length of 530 mm and a diameter of 58 mm was provided with a PTFE-filled chemical nickel layer of a thickness of 15 microns. When used in a three-roll dampening unit in a sheet-fed offset press, it showed very even dampening solution transfer and improved dampening solution transfer performance.
  • An aluminum roller with a coating length of 530 mm and a diameter of 58 mm was coated with a PTFE-filled hard-enamel layer a thickness of 40 microns provided.
  • a PTFE-filled hard-enamel layer a thickness of 40 microns provided.
  • An aluminum roller having a coating length of 530 mm and a diameter of 58 mm was provided with an alumina (corundum, boehmite) layer having a thickness of 50 ⁇ m.
  • alumina corundum, boehmite

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  • Rotary Presses (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Rolls And Other Rotary Bodies (AREA)

Description

Die vorliegende Erfindung betrifft eine Walze im Feuchtwerk, wie Feuchtreiberwalze, Feuchtübertragswalze bzw. Feuchtduktorwalze und ihre Verwendung in einem Feuchtwerk.The present invention relates to a roller in the dampening unit, such as dampening drive roller, wet transfer roller or dampening roller and their use in a dampening unit.

Der Offsetdruck ist ein indirektes Druckverfahren, das im Zeitungs-, Zeitschriften-, Katalogdruck etc. zum Einsatz kommt. Im Offsetdruck wird eine Druckform erstellt, typischerweise eine dünne Aluminiumplatte. Diese wird auf einen Plattenzylinder gespannt und steht in der Druckmaschine mit Farb- und Feuchtwerken in Verbindung. Lipophile Bereiche der Druckform nehmen Druckfarbe an, während hydrophile Bereiche farbfrei bleiben.Offset printing is an indirect printing process used in newspaper, magazine and catalog printing. In offset printing, a printing plate is created, typically a thin aluminum plate. This is clamped on a plate cylinder and is in the printing machine with inking and dampening in conjunction. Lipophilic areas of the printing form accept ink while hydrophilic areas remain colorless.

Von dem Plattenzylinder wird die Druckfarbe auf das Drucktuch übertragen, das auf einem Gummituchzylinder oder Offsetzylinder montiert ist. Der Gummituchzylinder überträgt die Farbe dann mit Hilfe eines Gegendruckzylinders oder eines weiteren Gummituchzylinders auf das zu bedruckende Medium.From the plate cylinder, the ink is transferred to the blanket mounted on a blanket cylinder or offset cylinder. The blanket cylinder then transfers the ink to the medium to be printed using a counter-pressure cylinder or another blanket cylinder.

Für die Druckqualität ist es entscheidend, dass die Druckform hinreichend mit Farbe und Feuchtmittel versehen wird. Es muss hinreichend Feuchtmittel (Wasser oder wässrig-alkoholische Mischungen) auf die Druckform übertragen werden, um die hydrophilen Bereiche farbfrei zu halten. Auf der anderen Seite muss genug Druckfarbe übertragen werden, um die lipophilen Bereiche mit Druckfarbe zu versorgen.For the print quality, it is crucial that the printing form is adequately provided with ink and dampening solution. It must sufficient dampening solution (water or aqueous-alcoholic mixtures) are transferred to the printing plate to keep the hydrophilic areas colorless. On the other hand, enough ink must be transferred to provide the lipophilic areas with ink.

Sowohl Feucht- als auch Farbwerke übertragen Feuchtmittel bzw. Farbe bzw. Farbe-Wasser-Emulsion auf die Druckform mittels Walzen.Both wet and inking transferred dampening solution or color or color-water emulsion to the printing plate by means of rollers.

Typische Feuchtwerke enthalten eine oder mehrere Walzen, wobei oft Walzen mit einer weichen Oberfläche, z.B. mit einer Elastomerbeschichtung, in Kontakt mit einer oder mehreren harten Walzen oder anderen elastomerbezogenen Walzen stehen.Typical dampening units include one or more rollers, often having soft surface, eg, elastomeric, rollers in contact with one or more hard rollers or other elastomer-related rollers.

Bei einem typischen dreiwalzigen Feuchtwerk steht eine weiche Feuchttauchwalze in direkter Verbindung mit dem Feuchtmittelvorrat. Sie "schöpft" Feuchtmittel aus dem Vorrat und überträgt dieses auf eine harte Walze. Die harte Walze überträgt den Feuchtmittelfilm auf die Feuchtauftragswalze.In a typical three-roll dampening unit, a soft dampening roller is in direct connection with the dampening solution supply. She "draws" fountain solution from the supply and transfers it to a hard roller. The hard roller transfers the dampening solution film to the dampening roller.

Die harte Walze wird als Feuchtreiberwalze, als Feuchtübertragswalze oder als Feuchtduktorwalze bezeichnet. Diese drei Begriffe werden in diesem Text synonym verwendet.The hard roller is referred to as dampening drive roller, as wet transfer roller or as a wet roller. These three terms are used synonymously in this text.

In einem typischen vierwalzigen Feuchtwerk ist die Feuchttauchwalze eine harte Walze, die das Feuchtmittel zunächst auf eine weiche Walze überträgt (Feuchtübertragswalze oder Feuchtdosierwalze), die dieses dann auf eine harte Feuchtreiberwalze bzw. Feuchtübertragswalze überträgt, die abschließend auf die Feuchtauftragswalze überträgt.In a typical four-roller dampening unit, the wet-type dipping roller is a hard roller which first transfers the dampening solution to a soft roller (wet transfer roller or dampening roller), which then transfers it to a hard dampening roller or wet transfer roller, which finally transfers to the dampening roller.

In Feuchtwerken existieren weitere Walzen, z.B. Reiterwalzen, die der Glättung des Feuchtmittelfilms dienen oder Brückenwalzen, die einen Kontakt zwischen Farb- und Feuchtwerk herstellen.In dampening units there are further rollers, e.g. Rider rollers, which serve to smooth the dampening solution film or bridge rollers, which establish a contact between inking and dampening unit.

Es existieren auch Systeme, bei denen die letzte Feuchtauftragswalze gleichzeitig auch eine Farbauftragswalze ist.There are also systems in which the last dampening roller is also an inking roller at the same time.

Alle diese Walzen werden im Folgenden unter dem Begriff 'Walze im Feuchtwerk' zusammengefasst. Bevorzugt handelt es sich bei den Walzen um harte Walzen, d.h. Walzen ohne Elastomerbezug.All these rollers are summarized below under the term 'roller in the dampening unit'. Preferably, the rollers are hard rollers, i. Rollers without elastomer cover.

Als Materialien für die Oberflächen von harten Walzen im Feuchtwerk, wie Feuchtreiberwalzen bzw. Feuchtübertragswalzen sind Chrom, Keramik und Edelstahl gebräuchlich.As materials for the surfaces of hard rollers in the dampening unit, such as dampening drive rollers or wet transfer rollers, chromium, ceramic and stainless steel are common.

DE-AS-1257170 beschreibt Verfahren zur Hydrophilierung von Feuchtwalzen durch Herstellung eines Überzuges, der ein Vinylsilan enthält. Die äußere Schicht der Walze wird von einem Silan gebildet. DE-AS-1257170 describes processes for hydrophilizing dampening rollers by preparing a coating containing a vinyl silane. The outer layer of the roll is formed by a silane.

DE60120444T2 offenbart Blindplatten, die aufgeraute und anodisch oxidierte Aluminiumplatten sind. Solche Platten werden dort auf Walzen montiert, wo keine Druckfarbe auf die zu bedruckende Bahn übertragen werden soll. DE60120444T2 discloses dummy plates which are roughened and anodized aluminum plates. Such plates are mounted there on rollers where no ink to be transferred to the web to be printed.

US 2003/0045412 offenbart eine lasergravierbare Prägewalze, die eine fluorierte Außenschicht tragen kann. US 2003/0045412 discloses a laser engravable embossing roll that can support a fluorinated outer layer.

GB 1 247 734 offenbart Artikel, die eine Nickelschicht gefolgt von einer Fluorcarbonschicht aufweisen und anschließend gesintert werden. GB 1 247 734 discloses articles having a nickel layer followed by a fluorocarbon layer and then sintered.

US 6,250,902 offenbart Prägewalzen, die eine Nickelbeschichtung und eine PTFE-Beschichtung aufweisen können. US 6,250,902 discloses embossing rolls which may have a nickel coating and a PTFE coating.

DE 2 353 593 offenbart ein Verfahren zur Verbesserung der Eigenschaften anodischer Oxidfilme auf Aluminium oder Aluminiumlegierungen. DE 2 353 593 discloses a method for improving the properties of anodic oxide films on aluminum or aluminum alloys.

EP 1 674 243 A2 offenbart einen Apparat und ein Verfahren zum Herstellung von dreidimensionalen Modellen. Dabei kann eine Walze zum Einsatz kommen, die eine anodisch oxidierte Aluminiumoberfläche aufweist. EP 1 674 243 A2 discloses an apparatus and method for making three-dimensional models. In this case, a roller can be used, which has an anodized aluminum surface.

US 6,290,834 offenbart eine Transferwalze zum Transport von Flüssigkeiten mit einer harten keramischen Beschichtung. US 6,290,834 discloses a transfer roller for transporting liquids with a hard ceramic coating.

Im Bereich der Feuchtwerke ist es problematisch, dass die sogenannte Farbrückspaltung auftritt. Die Feuchtauftragswalze, die mit der Druckform in Verbindung steht, wird während des Betriebes mit Druckfarbe oder einer Druckfarbenemulsion benetzt. Sie überträgt dann diese sukzessiv rückwärts auch auf die weiteren Walzen im Feuchtwerk, sowohl auf die Feuchttauch- oder Feuchtdosierwalze als auch auf die Feuchtreiberwalze bzw. Feuchtübertragswalze, so dass es im Endeffekt sogar zu einer Verunreinigung des Feuchtmittels kommen kann. Das Verschleppen der Farbe führt mit der Zeit zu Farbaufbau auf den Oberflächen der Feuchtwalzen und Beeinträchtigung des Druckprozesses. Dies macht im Regelfall ein Anhalten des Druckprozesses und Reinigen erforderlich.In the field of dampening units, it is problematic that the so-called color cleavage occurs. The dampening roller associated with the printing form is wetted during operation with printing ink or an ink emulsion. It then transmits this successively backwards to the other rollers in the dampening unit, both on the wet dipping or dampening metering roller and on the dampening roller or wet transfer roller, so that it can even come to contamination of the dampening solution in the end. The carryover of the paint leads over time to color build-up on the surfaces of the dampening rollers and impairment of the printing process. As a rule, this will stop the printing process and require cleaning.

Trotz vieler Varianten von Elastomerbeschichtungen der weichen Walzen und unterschiedlicher Oberflächenausführungen der harten Walzen ist das Problem der Farbrückspaltung nicht vollständig gelöst. Es besteht daher weiterhin Bedarf nach verbesserten Feuchtwerken, die zumindest einige der bekannten Probleme des Standes der Technik lösen.Despite many variations of elastomeric coatings of the soft rolls and different surface finishes of the hard rolls, the problem of color cleavage is not completely solved. There is therefore still a need for improved dampening systems which solve at least some of the known problems of the prior art.

Überraschenderweise kann die Aufgabe gelöst werden durch ein Feuchtwerk enthaltend mindestens eine Walze mit einem Kern und einer äußeren Schicht, wobei die äußere Schicht ausgewählt wird aus

  • Aluminiumharteloxat
  • Chemisch Nickel
  • Aluminiumoxid erhältlich durch plasmachemische anodische Oxidation und Kombinationen davon.
Surprisingly, the object can be achieved by a dampening unit comprising at least one roller having a core and an outer layer, wherein the outer layer is selected from
  • Aluminiumharteloxat
  • Chemically nickel
  • Alumina obtainable by plasma chemical anodic oxidation and combinations thereof.

Die erfindungsgemäßen Feuchtwerkwalzen zeigen eine reduzierte Farbrückspaltung, verbesserten und gleichmäßigeren Feuchtmittelübertrag und/oder leichtere Waschbarkeit.The dampening roller according to the invention show a reduced color cleavage, improved and more uniform dampening solution transfer and / or easier washability.

Erfindungsgemäß wird als harte Walze im Feuchtwerk, insbesondere Feuchtreiberwalze, Feuchtduktor bzw. Feuchtübertragswalze eine Walze eingesetzt, die eine äußere Schicht aufweist, die ein Aluminiumharteloxat oder eine Schicht aus Chemisch Nickel oder eine Aluminiumoxidschicht erhältlich durch plasmachemische anodische Oxidation ist.According to the invention, a roller which has an outer layer which is an aluminum hard oxoxide or a layer of chemical nickel or an aluminum oxide layer obtainable by plasma-chemical anodic oxidation is used as the hard roller in the dampening unit, in particular dampening drive roller, dampening roller or wet transfer roller.

Harteloxate von Aluminium sind dem Fachmann bekannt. Sie werden erhalten durch anodisches Oxidieren in einem kalten, sauren Elektrolyten. Durch den elektrischen Strom wird auf der Oberfläche eine schützende Aluminiumoxidschicht gebildet. Als Ausgangsmaterial können Aluminium und Aluminiumlegierungen eingesetzt werden.Hard oxoates of aluminum are known to the person skilled in the art. They are obtained by anodizing in a cold, acidic electrolyte. The electric current forms a protective aluminum oxide layer on the surface. As starting material aluminum and aluminum alloys can be used.

In einer Ausführungsform wird eine Walze verwendet, bei der die gesamte Walze (monolithisch) aus Aluminium besteht.In one embodiment, a roll is used in which the entire roll (monolithic) is made of aluminum.

In einer anderen Ausführungsform enthält die Walze einen Kern eines anderen Materials, beispielsweise einen Stahlkern, einen Carbonfaser- oder Glasfaserkern, oder Ähnliches und eine äußere Hülle aus Aluminium, die harteloxiert wird.In another embodiment, the roll includes a core of another material, such as a steel core, a carbon fiber or glass fiber core, or the like, and an outer shell of aluminum that is hard-anodized.

In einer bevorzugten Ausführungsform werden in die äußere Schicht bei der Herstellung des Eloxats weitere Materialien eingelagert, beispielsweise PTFE (Polytetrafluorethylen) oder Siliziumcarbidpartikel.In a preferred embodiment, further materials, for example PTFE (polytetrafluoroethylene) or silicon carbide particles, are incorporated into the outer layer during production of the anodized material.

Chemisch Nickel ist ein Verfahren bei dem außenstromlos Nickel aus einer Lösung von Nickelionen und einem Reduktionsmittel (typischerweise Hypophosphit) abgeschieden wird. Das Verfahren der Abscheidung von Nickelschichten auf Oberflächen ist dem Fachmann grundsätzlich bekannt.Chemical nickel is a process in which electroless nickel is deposited from a solution of nickel ions and a reducing agent (typically hypophosphite). The method of depositing nickel layers on surfaces is basically known to the person skilled in the art.

Typischerweise wird für diese Ausführungsform ein Kern ausgewählt aus Stahlkernen, Aluminiumkernen und Carbonfaserkernen verwendet. Es ist auch in diesem Fall möglich, dass in die äußere Schicht PTFE-, andere fluorhaltige Polymer- oder Siliziumcarbidpartikel eingelagert werden.Typically, for this embodiment, a core selected from steel cores, aluminum cores and carbon fiber cores is used. It is also possible in this case that in the outer layer of PTFE, other fluorine-containing polymer or Siliziumcarbidpartikel be stored.

Durch die Verwendung von phosphorhaltigen Chemisch Nickelreagenzien wird in die Schicht typischerweise auch Phosphor mit eingebaut.By using phosphorus-containing chemical nickel reagents, phosphorus is also typically incorporated into the layer.

Eine weitere geeignete äußere Schicht wird durch eine plasmachemische Beschichtung erhalten. Hierzu kann ein Werkstück mit einer äußeren Stromquelle als Anode geschaltet werden. Bei der Anodisation entlädt sich Sauerstoffplasma an der Werkstückoberfläche, erschmilzt diesen und bildet zwei Oxidkeramikschichten, die überwiegend aus Korund und Böhmit bestehen; siehe auch EP 0 545 230 .Another suitable outer layer is obtained by a plasma-chemical coating. For this purpose, a workpiece with an external power source can be connected as the anode. During anodization, oxygen plasma discharges on the workpiece surface, melts it, and forms two layers of oxide ceramics, which mainly consist of corundum and boehmite; see also EP 0 545 230 ,

Auch in diesen Schichten können grundsätzlich weitere Partikel, beispielsweise Fluorpolymere eingeschlossen werden. Entsprechende Verfahren sind dem Fachmann aus der DE 42 39 391 bekannt.In principle, further particles, for example fluoropolymers, can also be included in these layers. Corresponding methods are known to those skilled in the art from DE 42 39 391 known.

Für die Verwendung eines Aluminiumharteloxats beträgt die bevorzugte Schichtdicke 5 bis 200, mehr bevorzugt 20 bis 100 µm, bevorzugt 30 bis 60 µm. Für die Aluminiumharteloxate ist eine Rauhigkeit der Oberfläche von Rz 0,1 bis 100, bevorzugt Rz 0,5 bis 8 µm besonders geeignet.For the use of an aluminum rigid oxide, the preferred layer thickness is 5 to 200, more preferably 20 to 100 μm, preferably 30 to 60 μm. For the aluminum hardoxates a roughness of the surface of Rz 0.1 to 100, preferably Rz 0.5 to 8 microns is particularly suitable.

Für die Verwendung eines Aluminiumoxids (Korund, Böhmit) beträgt die bevorzugte Schichtdicke 5 bis 200, mehr bevorzugt 20 bis 100 µm, bevorzugt 30 bis 60 µm. Für die Aluminiumoxide (Korund, Böhmit) ist eine Rauhigkeit der Oberfläche von Ra 0,05 bis 20,0 bevorzugt Ra 0,1 bis 2,0 µm besonders geeignet.For the use of an aluminum oxide (corundum, boehmite), the preferred layer thickness is 5 to 200, more preferably 20 to 100 μm, preferably 30 to 60 μm. For the aluminum oxides (corundum, boehmite) is a roughness of Surface of Ra 0.05 to 20.0 preferably Ra 0.1 to 2.0 microns particularly suitable.

Bei einer Chemisch Nickelschicht beträgt die typische Dicke 2 bis 40 µm, bevorzugt 10 bis 20 µm. Eine Rauigkeit von Rz 0,1 bis 100, bevorzugt Rz 0,5 bis 8 µm ist besonders geeignet.For a chemical nickel layer, the typical thickness is 2 to 40 μm, preferably 10 to 20 μm. A roughness of Rz 0.1 to 100, preferably Rz 0.5 to 8 microns is particularly suitable.

Eine andere Ausführungsform der Erfindung ist eine erfindungsgemäße Feuchtwerkwalze, wie oben beschrieben, bei der zusätzlich eine PTFE oder fluorhaltige Polymerschicht aufgebracht wird, d.h. eine PTFE- oder andere fluorhaltige Polymere sind nicht in die Schicht eingelagert, sondern bilden eine separate Schicht.Another embodiment of the invention is a dampening roller according to the invention, as described above, in which additionally a PTFE or fluorine-containing polymer layer is applied, i. a PTFE or other fluorine-containing polymers are not incorporated in the layer, but form a separate layer.

Gegenstand der Erfindung ist ein Feuchtwerk enthaltend mindestens eine erfindungsgemäße Walze sowie die Verwendung der erfindungsgemäßen Walze als Walze, insbesondere Feuchtreiberwalze bzw. Feuchtübertragswalze in einem Feuchtwerk.The invention relates to a dampening unit comprising at least one roller according to the invention and the use of the roller according to the invention as a roller, in particular dampening drive roller or wet transfer roller in a dampening unit.

Überraschenderweise zeigen die erfindungsgemäßen Feuchtwerkwalzen gute Feuchtübertragsleistungen bei einer Verminderung der Farbrückspaltung.Surprisingly, the dampening roller according to the invention show good wet transfer performance with a reduction in color cleavage.

Figur 1 zeigt schematisch den Aufbau eines vierwalzigen Feuchtwerks. Die Feuchttauchwalze (5b) ist eine harte Walze, die das Feuchtmittel zunächst auf eine weiche Walze (6) überträgt, die dieses dann auf eine harte Feuchtreiberwalze, Feuchtduktorwalze bzw. Feuchtübertragswalze (4) überträgt, die auf die Feuchtauftragswalze (3) überträgt, die abschließend auf den Plattenzylinder (1) aufträgt. Der Plattenzylinder steht auch in Verbindung mit den Farbauftragswalzen (2). FIG. 1 shows schematically the structure of a four-roll dampening unit. The wet dipping roller (5b) is a hard roller which first transfers the dampening solution to a soft roller (6), which then transfers it to a hard dampening drive roller, dampening roller (4) which transfers to the dampening roller (3) finally applies to the plate cylinder (1). The plate cylinder is also in connection with the inking rollers (2).

Figur 2 zeigt schematisch den Aufbau eines dreiwalzigen Feuchtwerks. Eine weiche Feuchttauchwalze (5a) steht in direkter Verbindung mit dem Feuchtmittelvorrat. Sie "schöpft" Feuchtmittel aus dem Vorrat und überträgt dieses auf eine harte Feuchtreiberwalze bzw. Feuchtübertragswalze (4). Die harte FIG. 2 shows schematically the structure of a three-roll dampening unit. A soft wet dipping roller (5a) is in direct connection with the dampening solution supply. It "draws" fountain solution from the supply and transfers it to a hard dampening roller or wet transfer roller (4). The hard one

Walze (4) überträgt den Feuchtmittelfilm auf die Feuchtauftragswalze (3), die abschließend auf den Plattenzylinder (1) aufträgt. Der Plattenzylinder steht auch in Verbindung mit den Farbauftragswalzen (2).Roller (4) transfers the dampening solution film onto the dampening applicator roll (3), which finally applies to the plate cylinder (1). The plate cylinder is also in connection with the inking rollers (2).

Die Erfindung wird durch die nachfolgenden Beispiele näher erläutert.The invention is explained in more detail by the following examples.

Beispiel 1example 1

Eine Aluminiumwalze mit einer Beschichtungslänge von 1110 mm und einem Durchmesser von 125 mm wurde mit einer Harteloxatschicht einer Dicke von 40 µm versehen. Bei Verwendung in einem dreiwalzigen Feuchtwerk in einer Rollenoffsetmaschine zeigte sie sehr gleichmäßigen Feuchtmittelübertrag und im Vergleich zu einer Keramikwalze verbesserte Feuchtmittelübertragsleistung (Drehzahl konnte um 10% reduziert werden), während die Farbrückspaltung verringert wurde.An aluminum roller having a coating length of 1110 mm and a diameter of 125 mm was provided with a hard iron oxide layer of a thickness of 40 μm. When used in a three-roll dampening unit in a web offset press, it exhibited very uniform dampening solution transfer and improved dampening solution transfer capacity (speed could be reduced by 10%) compared to a ceramic roller, while the color rejection was reduced.

Beispiel 2Example 2

Eine Aluminiumwalze mit einer Beschichtungslänge von 530 mm und einem Durchmesser von 58 mm wurde mit einer Harteloxatschicht einer Dicke von 40 µm versehen. Bei Verwendung in einem dreiwalzigen Feuchtwerk in einer Bogenoffsetmaschine zeigte sie sehr gleichmäßigen Feuchtmittelübertrag und verbesserte Feuchtmittelübertragsleistung.An aluminum roller having a coating length of 530 mm and a diameter of 58 mm was provided with a hard iron oxide layer having a thickness of 40 μm. When used in a three-roll dampening unit in a sheet-fed offset press, it showed very even dampening solution transfer and improved dampening solution transfer performance.

Beispiel 3Example 3

Eine Aluminiumwalze mit einer Beschichtungslänge von 530 mm und einem Durchmesser von 58 mm wurde mit einer PTFE gefüllten Chemisch Nickel Schicht einer Dicke von 15 µm versehen. Bei Verwendung in einem dreiwalzigen Feuchtwerk in einer Bogenoffsetmaschine zeigte sie sehr gleichmäßigen Feuchtmittelübertrag und verbesserte Feuchtmittelübertragsleistung.An aluminum roller with a coating length of 530 mm and a diameter of 58 mm was provided with a PTFE-filled chemical nickel layer of a thickness of 15 microns. When used in a three-roll dampening unit in a sheet-fed offset press, it showed very even dampening solution transfer and improved dampening solution transfer performance.

Beispiel 4Example 4

Eine Aluminiumwalze mit einer Beschichtungslänge von 530 mm und einem Durchmesser von 58 mm wurde mit einer PTFE gefüllten Harteloxat Schicht einer Dicke von 40 µm versehen. Bei Verwendung in einem dreiwalzigen Feuchtwerk in einer Bogenoffsetmaschine zeigte sie sehr gleichmäßigen Feuchtmittelübertrag und verbesserte Feuchtmittelübertragsleistung.An aluminum roller with a coating length of 530 mm and a diameter of 58 mm was coated with a PTFE-filled hard-enamel layer a thickness of 40 microns provided. When used in a three-roll dampening unit in a sheet-fed offset press, it showed very even dampening solution transfer and improved dampening solution transfer performance.

Beispiel 5Example 5

Eine Aluminiumwalze mit einer Beschichtungslänge von 530 mm und einem Durchmesser von 58 mm wurde mit einer Aluminiumoxid (Korund, Böhmit) Schicht einer Dicke von 50 µm versehen. Bei Verwendung in einem dreiwalzigen Feuchtwerk in einer Bogenoffsetmaschine zeigte sie sehr gleichmäßigen Feuchtmittelübertrag und verbesserte Feuchtmittelübertragsleistung.An aluminum roller having a coating length of 530 mm and a diameter of 58 mm was provided with an alumina (corundum, boehmite) layer having a thickness of 50 μm. When used in a three-roll dampening unit in a sheet-fed offset press, it showed very even dampening solution transfer and improved dampening solution transfer performance.

Beispiel 6Example 6

Die Rotationsgeschwindigkeit der Walzen der Beispiele 2 bis 5 und einer Vergleichswalze des Standes der Technik wurden in einer Bogenoffsetmaschine so eingestellt, dass eine gute Feuchtmittelübertragung erfolgte. Es zeigte sich, dass die erfindungsgemäßen Walzen mit einer geringeren Drehzahl betrieben werden können, d.h. dass sie eine bessere Feuchtmittelübertragung zeigen. äußere Schicht Kern Ra in µm Rz in µm prozentuale Drehzahl der Feuchtduktorwalze Hartchrom (Vergleich) Stahl 0,07 0,44 85% Harteloxat (Beispiel 2) Alu 0,63 1,12 65% Chemisch-Nickel mit PTFE (Beispiel 3) Alu 0,79 5,81 70% Harteloxat + PTFE (Beispiel 4) Alu 1,08 6,14 68% Aluminiumoxid (Beispiel 5) Alu 0,68 5,15 80% The rotational speed of the rolls of Examples 2 to 5 and a prior art comparative roll were adjusted in a sheetfed offset press to give a good fountain solution transfer. It turned out that the rolls according to the invention can be operated at a lower rotational speed, ie that they show better damping agent transfer. outer layer core Ra in μm Rz in μm percentage speed of the dampening roller Hard chrome (comparison) stole 0.07 0.44 85% Hard anodate (Example 2) Alu 0.63 1.12 65% Chemical nickel with PTFE (Example 3) Alu 0.79 5.81 70% Hard anodate + PTFE (Example 4) Alu 1.08 6.14 68% Alumina (Example 5) Alu 0.68 5.15 80%

Claims (14)

  1. A dampening unit containing at least one roller having a core and an outer layer, wherein said outer layer is selected from:
    - hard anodized aluminum;
    - chemical nickel;
    - aluminum oxide obtainable by plasma-chemical anodic oxidation; and
    - combinations thereof.
  2. The dampening unit according to claim 1, wherein PTFE, other fluorine-containing polymers or silicon carbide particles are additionally incorporated in the outer layer.
  3. The dampening unit according to claim 1, characterized in that an outer layer of PTFE or another fluorine-containing polymer is applied to a roller having a core and an outer layer, wherein said outer layer is selected from:
    - hard anodized aluminum;
    - chemical nickel;
    - aluminum oxide obtainable by plasma-chemical anodic oxidation; and
    - combinations thereof.
  4. The dampening unit according to any of claims 1 to 3, characterized in that said core is selected from steel cores, aluminum cores, carbon fiber cores, glass fiber cores.
  5. The dampening unit according to at least one of claims 1 to 4, characterized in that the layer thickness of said layer of hard anodized aluminum is from 20 to 100 µm, preferably from 30 to 60 µm, and/or said layer of hard anodized aluminum has a roughness of Rz = 0.1 to 100 µm, preferably 0.5 to 8 µm.
  6. The dampening unit according to at least one of claims 1 to 5, characterized in that said chemical nickel layer contains from 2 to 15% by weight of phosphorus.
  7. The dampening unit according to at least one of claims 1 to 6, characterized in that the thickness of said chemical nickel layer is from 2 to 40 µm, preferably from 10 to 20 µm, and/or said chemical nickel layer has a roughness of Rz = 0.1 to 100 µm, preferably 0.5 to 8 µm.
  8. The dampening unit according to any of claims 1 to 7, characterized in that the layer thickness of said aluminum oxide layer is from 5 to 200 µm, preferably from 30 to 60 µm, and/or the roughness of said aluminum oxide layer is Ra = 0.05 to 20.0 µm, preferably Ra = 0.1 to 2.0 µm.
  9. The dampening unit according to any of claims 1 to 8, wherein said at least one roller is a dampening contact roller, dampening transfer roller or dampening ductor (4).
  10. Use of a roller having a core and an outer layer, wherein said outer layer is selected from:
    - hard anodized aluminum;
    - chemical nickel;
    - aluminum oxide obtainable by plasma-chemical anodic oxidation; and
    - combinations thereof;
    as a roller in a dampening unit, especially as a dampening contact roller, dampening transfer roller or dampening ductor (4) in a dampening unit.
  11. The use according to claim 10, characterized in that said outer layer is a layer of hard anodized aluminum.
  12. The use according to claim 10, characterized in that said outer layer is a chemical nickel layer.
  13. The use according to claim 10, characterized in that said outer layer is an aluminum oxide layer obtainable by plasma-chemical anodic oxidation.
  14. The use according to any of claims 11 to 13, characterized in that said outer layer has incorporated particles of PTFE, other fluorine-containing polymers or silicon carbide.
EP10735239.5A 2009-07-14 2010-07-14 Dampening system rollers Active EP2454099B1 (en)

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SI201030806T SI2454099T1 (en) 2009-07-14 2010-07-14 Dampening system rollers
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PL10735239T PL2454099T3 (en) 2009-07-14 2010-07-14 Dampening system rollers

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EP10735239.5A EP2454099B1 (en) 2009-07-14 2010-07-14 Dampening system rollers
PCT/EP2010/060147 WO2011006932A1 (en) 2009-07-14 2010-07-14 Dampening system rolls

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DE202011107519U1 (en) 2011-11-04 2011-12-08 Paul Sauer Gmbh & Co. Walzenfabrik Kg Roller with rubber-elastic roller jacket
DE202011107518U1 (en) 2011-11-04 2011-12-08 Paul Sauer Gmbh & Co. Walzenfabrik Kg Roller or roller element with elastomeric roll shell
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JP5695043B2 (en) 2015-04-01
UA108855C2 (en) 2015-06-25
SG177348A1 (en) 2012-02-28
PT2454099E (en) 2014-10-30
DK2454099T3 (en) 2014-12-15
AU2010272520A1 (en) 2012-01-19
BR112012000949A2 (en) 2016-03-15
CN102470685A (en) 2012-05-23
PL2454099T3 (en) 2015-03-31
US20120145021A1 (en) 2012-06-14
WO2011006932A1 (en) 2011-01-20
EP2454099A1 (en) 2012-05-23
JP2012532778A (en) 2012-12-20
SI2454099T1 (en) 2014-12-31
ES2523349T3 (en) 2014-11-25
EA201200126A1 (en) 2012-06-29
AU2010272520B2 (en) 2015-03-12

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