EP1340616A2 - Surface for machine parts in a printing machine - Google Patents

Surface for machine parts in a printing machine Download PDF

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Publication number
EP1340616A2
EP1340616A2 EP03002783A EP03002783A EP1340616A2 EP 1340616 A2 EP1340616 A2 EP 1340616A2 EP 03002783 A EP03002783 A EP 03002783A EP 03002783 A EP03002783 A EP 03002783A EP 1340616 A2 EP1340616 A2 EP 1340616A2
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EP
European Patent Office
Prior art keywords
surface according
coating
carrier layer
pores
layer
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EP03002783A
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German (de)
French (fr)
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EP1340616B1 (en
EP1340616A3 (en
Inventor
Arndt Jentzsch
Horst Böttcher
Helfried Haufe
Boris Mahlting
Holger Richter
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Koenig and Bauer AG
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Koenig and Bauer AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F22/00—Means preventing smudging of machine parts or printed articles
    • 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
    • B41N2207/04—Intermediate 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
    • B41N7/00—Shells for rollers of printing machines

Definitions

  • the invention relates to a surface for machine parts of a printing press, in particular sheet guiding elements or sheet-guiding cylinders, which come into contact with printing ink and can thereby become dirty.
  • the surface is used for example on sheet guiding cylinders including impression cylinders, transfer cylinders, turning or storage cylinders, as well as on all types of sheet guiding devices.
  • an ink-repellent coating for an element contacting a printing material is shown.
  • the coating consists of titanium oxide or zinc oxide and is photosensitive.
  • the coated elements are irradiated once or repeatedly with UV light in order to bring about the color-repellent property of the titanium oxide or zinc oxide and to refresh it from time to time.
  • the disadvantage of this solution is that the ink acceptance behavior of the coated elements is not constant over time and further time and, if appropriate, mechanical engineering expenditure is also required to reactivate the chemical properties.
  • machine parts on sheet-fed printing machines are known can come into contact with paint or dirt, with a microstructured one To provide surface self-cleaning coating.
  • DE 199 48 311 A1 describes the use of a coating composition low surface energy for parts of a printing machine.
  • the coating is for the material with the ink on the way from the ink container to the material to be printed on Touching surfaces of anilox rollers or ink hoses are provided.
  • the surfaces coated in this way initially show good color-repellent properties, however, wear out quickly.
  • the object of the invention results from the disadvantages mentioned, a surface of the to create the type mentioned above, which accepts little or no ink, wear-resistant and that can be regenerated.
  • the invention is based on the knowledge that the durability of the outermost coating (functional coating) applied to the components of a printing press, which protects it from soiling with printing ink, depends crucially on the anchoring of the coating in the layer below.
  • suitably shaped pores are provided, into which the functional coating, which is applied in liquid form, can penetrate before it is cured by drying and subsequent thermal aftertreatment. It is important here that the size of the pores is set such that when the functional coating is applied repeatedly, sufficient pore volume is available to anchor the additional functional coatings applied after the first. This ensures that the surface can be regenerated by renewed coating.
  • pores with irregular diameters has proven to be advantageous, ie both the diameter from pore to pore and the diameter of the individual pores fluctuate in a certain range.
  • a surface with particularly stable properties can be produced if the alignment of the pores is also irregular and the pores in particular do not run radially to the cylinder axis.
  • a pore structure that meets these requirements can be produced in a simple manner by thermal spraying.
  • the surface according to the invention is formed on the circumference of a sheet-guiding cylinder such as the impression cylinder, transfer cylinder, turning or storage cylinder, but can also be provided on any other machine part that comes into contact with paint and can thereby become dirty.
  • a carrier layer 1 produced by the plasma coating process is applied to the cast base body of the cylinder. This is produced using metallic or metal oxide powders, which preferably have grain sizes between 5 and 50 ⁇ m.
  • An adhesion promoter layer can be provided between the carrier layer 1 and the base body.
  • the targeted setting of the parameters in plasma spraying results in random distribution of unaligned pores 2 in the carrier layer 1, which vary in size and have diameters of 5 to 10 ⁇ m. Depending on the parameters of the coating, microcracks can also occur.
  • the carrier layer 1 can be structured out or smoothed by mechanical surface treatment.
  • a functional coating 5, 6 is provided on the carrier layer 1.
  • the functional coating 5, 6 can consist of one or more layers. she is executed in such a way that a height difference is obtained between profile height 3 and profile depth 4 remains.
  • the total layer thickness of the functional coating 5, 6 is smaller than that Diameter of the pores 2 of the carrier material, i.e. which is the total thickness of the Areas of the functional coating 5, 6 that always lie opposite the pores 2 is smaller than the pore diameter.
  • Modified inorganic nanoparticles are used as coating material, which are dissolved in aqueous, alcoholic or mixed solvents and modified by hydrolysis products of long-chain trialkoxysilanes R-Si (OR) 3 and / or dialkoxysilanes R-Si (OR) 2 , where R 4 to Contains 18 carbon atoms in alkyl, aralkyl, or fluoroalkyl radicals.
  • R-Si (OR) 3 and / or dialkoxysilanes R-Si (OR) 2 where R 4 to Contains 18 carbon atoms in alkyl, aralkyl, or fluoroalkyl radicals.
  • the use of polysiloxanes with terminal alkyl, aryl, hydroxyalkyl, epoxy or polyether radicals can be provided for the modification of the inorganic nanosols.
  • the nanoparticles, whose diameter is less than 10 nm, are part of a liquid dispersion.
  • the coating can be produced in a simple manner using the sol-gel process.
  • the nanosol produced is applied by known coating methods, such as spray, brush, dip, spin or dip coating, with a defined coating thickness.
  • the coating solution is distributed uniformly on the surface of the carrier layer 1 and also penetrates into the interior of the pores 2 in the carrier layer 1, but without clogging the pores 2.
  • the nanoparticles are oriented and the sol gels.
  • the solvent is subsequently removed from the layer by drying.
  • the dried layer can then be fixed by tempering at temperatures between 100 and 400 ° C.
  • the functional coating 5, 6 produced in this way is oleophobic and counteracts contamination with oil-based printing ink.
  • the relative resistance of the functional coating 5, 6 results from the fact that parts of the coating are anchored in the pores 2 of the carrier layer 1. If the functional coating 5, 6 wears out due to mechanical wear, the coating process can be repeated. The pores 2 also offer sufficient points of attack for anchoring the functional coating 5, 6 for further coating processes. This becomes clear in FIG. 2, in which a second layer 6 is superimposed on a first layer of the functional coating 5. This makes it possible to regenerate the surface and thus its properties.
  • the surface of the machine part can be structured his.
  • the structure is adjusted in such a way that it can also be applied by applying the carrier material is not leveled.
  • the functional coating 5, 6 is designed with modified compounds of silicon oxide with aluminum oxide as nanosol, which is modified using a 10% solution of fluoroalkyl-functionalized polysiloxanes, the surface also has poor wettability with respect to water. With the aforementioned embodiment, the contamination of the surfaces by the accumulation of dirt particles dissolved in water can also be counteracted.

Landscapes

  • Printing Plates And Materials Therefor (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

A surface for the machine parts of a printing machine, which contacts the printing ink and can thus become soiled, built up from a base material with a carrier layer and oleophobic functional layer overlaying the carrier layer, where the carrier layer (1) has pores (2) into the inner spaces of which the functional layers (5,6) reach, these being of thickness less than the pore diameter. A surface for the machine parts of a printing machine, especially the arched guide element (sic) or the arched guide cylinder (sic), which contacts the printing ink and can thus become soiled, built up from a base material with a carrier layer and oleophobic functional layer overlaying the carrier layer, where the carrier layer (1) has pores (2) into the inner spaces of which the functional layers (5,6) reach, these being of thickness less than the pore diameter.

Description

Die Erfindung betrifft eine Oberfläche für Maschinenteile einer Druckmaschine, insbesondere Bogenleitelemente oder bogenführende Zylinder, die mit Druckfarbe in Berührung kommen und dabei verschmutzen können. Die Oberfläche findet beispielsweise Anwendung an Bogenführungszylindern einschließlich Druckzylindern, Übergabezylindern, Wende- oder Speicherzylindern, sowie an allen Arten von Bogenleiteinrichtungen. Die Gefahr der Verschmutzung durch Druckfarbe besteht insbesondere bei der Herstellung von beidseitig bedruckten Druckbögen. Diese werden, nachdem der Druckprozess auf der Schöndruckseite abgeschlossen ist, gewendet und den nachfolgend angeordneten Druckwerken zugeführt, wobei die bereits bedruckte Seite der Druckbögen der Oberfläche der bogenführenden Zylinder zugewandt ist und mit dieser in Kontakt steht.
In der Kontaktzone kann sich dabei Druckfarbe auf den bogenführenden Zylindern aufbauen und auf den folgenden Druckbögen ablagern, was zu Qualitätseinbußen führt.The invention relates to a surface for machine parts of a printing press, in particular sheet guiding elements or sheet-guiding cylinders, which come into contact with printing ink and can thereby become dirty. The surface is used for example on sheet guiding cylinders including impression cylinders, transfer cylinders, turning or storage cylinders, as well as on all types of sheet guiding devices. There is a particular risk of contamination from printing inks when producing printing sheets printed on both sides. After the printing process on the face printing side is completed, these are turned over and fed to the printing units arranged downstream, the already printed side of the printing sheets facing the surface of the sheet-guiding cylinders and being in contact therewith.
In the contact zone, ink can build up on the sheet-guiding cylinders and deposit on the following sheets, which leads to a loss of quality.

Es ist allgemein bekannt, die Oberflächen der bogenführenden Zylinder in Druckmaschinen oder die Oberfläche von auf den Zylindern befestigten Folien aufzurauen, wodurch deren Benetzbarkeit gegenüber Druckfarbe verändert wird.
Nach der DE 12 58 873 wird vorgeschlagen, einen Zylinder mit Aluminiumblech zu überziehen, das gekörnt, sandgeblasen oder in anderer Weise behandelt worden ist, um eine bestimmte Oberflächenrauigkeit und Struktur zu erzielen.It is generally known to roughen the surfaces of the sheet-guiding cylinders in printing machines or the surface of foils attached to the cylinders, thereby changing their wettability with respect to printing ink.
According to DE 12 58 873, it is proposed to cover a cylinder with aluminum sheet which has been grained, sandblasted or treated in some other way in order to achieve a certain surface roughness and structure.

Bei der in der DE 101 15 876 A1 beschriebenen Lösung wird eine farbabweisende Beschichtung für ein einen Bedruckstoff kontaktierendes Element dargestellt. Die Beschichtung besteht aus Titanoxid oder Zinkoxid und ist photosensitiv. Die beschichteten Elemente werden einmalig oder wiederholt mit UV-Licht bestrahlt, um die farbabweisende Eigenschaft des Titanoxids oder Zinkoxids hervorzurufen und von Zeit zu Zeit wiederaufzufrischen.
Nachteilig ist an dieser Lösung, dass das Farbannahmeverhalten der beschichteten Elemente nicht zeitlich konstant ist und zur Reaktivierung der chemischen Eigenschaften weiterer zeitlicher und ggf. auch maschinenbaulicher Aufwand entsteht.In the solution described in DE 101 15 876 A1, an ink-repellent coating for an element contacting a printing material is shown. The coating consists of titanium oxide or zinc oxide and is photosensitive. The coated elements are irradiated once or repeatedly with UV light in order to bring about the color-repellent property of the titanium oxide or zinc oxide and to refresh it from time to time.
The disadvantage of this solution is that the ink acceptance behavior of the coated elements is not constant over time and further time and, if appropriate, mechanical engineering expenditure is also required to reactivate the chemical properties.

Gemäß der DE 199 14 136 A1 ist bekannt, Maschinenteile an Bogendruckmaschinen, die mit Farbe oder Schmutz in Berührung kommen können, mit einer eine mikrostrukturierten Oberfläche aufweisenden sich selbstreinigenden Beschichtung zu versehen. According to DE 199 14 136 A1, machine parts on sheet-fed printing machines are known can come into contact with paint or dirt, with a microstructured one To provide surface self-cleaning coating.

In der DE 199 48 311 A1 wird die Verwendung einer Beschichtungszusammensetzung mit niedriger Oberflächenenergie für Teile einer Druckmaschine dargestellt. Die Beschichtung ist für die mit der Farbe auf dem Weg vom Farbbehälter zum zu bedruckenden Material in Berührung kommenden Oberflächen von Rasterwalzen oder Farbschläuchen vorgesehen.DE 199 48 311 A1 describes the use of a coating composition low surface energy for parts of a printing machine. The coating is for the material with the ink on the way from the ink container to the material to be printed on Touching surfaces of anilox rollers or ink hoses are provided.

Aus der DE 198 50 968 A1 ist bekannt eine farbabweisende Beschichtung aus einer hartmetallischen oder metalloxidischen Schicht, die mit einem Polyorganosilan als Siegelstoff behandelt wurde.DE 198 50 968 A1 discloses an ink-repellent coating made of a hard metal or metal oxide layer treated with a polyorganosilane as a sealant has been.

Die derart beschichteten Oberflächen zeigen anfänglich gute farbabweisende Eigenschaften, nutzen sich jedoch schnell ab.The surfaces coated in this way initially show good color-repellent properties, however, wear out quickly.

Aus den genannten Nachteilen resultiert die Aufgabe der Erfindung, eine Oberfläche der eingangs genannten Art zu schaffen, die keine oder nur wenig Druckfarbe annimmt, verschleißbeständig ist und die regeneriert werden kann.The object of the invention results from the disadvantages mentioned, a surface of the to create the type mentioned above, which accepts little or no ink, wear-resistant and that can be regenerated.

Zur Lösung der Aufgabe wird eine Oberfläche eines bogenführenden Zylinders einer Druckmaschine vorgeschlagen, die die Merkmale des Anspruchs 1 aufweist.
Weitere vorteilhafte Ausgestaltungen ergeben sich aus den Unteransprüchen.To achieve the object, a surface of a sheet-guiding cylinder of a printing press is proposed, which has the features of claim 1.
Further advantageous embodiments result from the subclaims.

Die Erfindung baut auf der Erkenntnis auf, dass die Beständigkeit der auf den Bauteilen einer Druckmaschine aufgebrachten äußersten Beschichtung (Funktionsbeschichtung), die diese gegen Verschmutzen mit Druckfarbe schützt, entscheidend von der Verankerung der Beschichtung in der darunterliegenden Schicht abhängt.
Dazu sind bei der vorliegenden Erfindung als Verankerungspunkte geeignet geformte Poren vorgesehen, in die die Funktionsbeschichtung, die in flüssiger Form aufgetragen wird, eindringen kann, bevor sie durch Trocknen und anschließendes thermisches Nachbehandeln ausgehärtet wird. Wesentlich ist hierbei, dass die Größe der Poren so eingestellt ist, dass bei wiederholtem Auftrag der Funktionsbeschichtung nach ausreichend Porenvolumen zur Verfügung steht, um auch die nach der ersten aufgebrachten, weiteren Funktionsbeschichtungen zu verankern. Damit ist gewährleistet, dass die Oberfläche durch erneutes Beschichten regeneriert werden kann. The invention is based on the knowledge that the durability of the outermost coating (functional coating) applied to the components of a printing press, which protects it from soiling with printing ink, depends crucially on the anchoring of the coating in the layer below.
For this purpose, in the present invention, suitably shaped pores are provided, into which the functional coating, which is applied in liquid form, can penetrate before it is cured by drying and subsequent thermal aftertreatment. It is important here that the size of the pores is set such that when the functional coating is applied repeatedly, sufficient pore volume is available to anchor the additional functional coatings applied after the first. This ensures that the surface can be regenerated by renewed coating.

Als vorteilhaft hat sich dabei die Ausbildung von Poren mit unregelmäßigen Durchmessern erwiesen, d.h. dass sowohl die Durchmesser von Pore zu Pore, wie auch der Durchmesser der einzelnen Poren in einem bestimmten Bereich schwanken. Eine Oberfläche mit besonders beständigen Eigenschaften lässt sich erzeugen, wenn auch die Ausrichtung der Poren unregelmäßig ist und die Poren insbesondere nicht radial zur Zylinderachse verlaufen.
Eine diesen Forderungen genügende Porenstruktur lässt sich in einfacher Weise durch thermisches Spritzen erzeugen.The formation of pores with irregular diameters has proven to be advantageous, ie both the diameter from pore to pore and the diameter of the individual pores fluctuate in a certain range. A surface with particularly stable properties can be produced if the alignment of the pores is also irregular and the pores in particular do not run radially to the cylinder axis.
A pore structure that meets these requirements can be produced in a simple manner by thermal spraying.

Anhand des nachfolgenden Ausführungsbeispiels soll die Erfindung näher erläutert werden.The invention will be explained in more detail with the aid of the following exemplary embodiment.

Es zeigt

Fig. 1
die Oberfläche einer Trägerschicht mit Poren und
Fig. 2
die erfindungsgemäße Oberfläche, bestehend aus einer Trägerschicht mit aufgebrachter zweischichtiger Funktionsbeschichtung.
It shows
Fig. 1
the surface of a carrier layer with pores and
Fig. 2
the surface according to the invention, consisting of a carrier layer with an applied two-layer functional coating.

Die erfindungsgemäße Oberfläche ist am Umfang eines bogenführenden Zylinders wie des Druckzylinder, Übergabezylinder, Wende- oder Speicherzylinder ausgebildet, kann jedoch ebenso an jedem anderen Maschinenteil, das mit Farbe in Berührung kommt und dadurch verschmutzen kann, vorgesehen sein.
Auf dem gegossenen Grundkörper des Zylinders ist eine im Plasmabeschichtungsverfahren erzeugte Trägerschicht 1 appliziert. Diese wird unter Verwendung von metallischen oder metalloxidischen Pulvern, die vorzugsweise Korngrößen zwischen 5 und 50 µm aufweisen, hergestellt. Zwischen Trägerschicht 1 und Grundkörper kann eine in den Figuren nicht dargestellte Haftvermittlerschicht vorgesehen sein.
Durch die gezielte Einstellung der Parameter beim Plasmaspritzen entstehen dabei in zufälliger Verteilung unausgerichtete Poren 2 in der Trägerschicht 1, die in ihrer Größe variieren und Durchmesser von 5 bis 10 µm aufweisen. In Abhängigkeit von der Parametern bei der Beschichtung können auch Mikrorisse auftreten. Die Trägerschicht 1 kann raustrukturiert, oder durch mechanische Oberflächenbehandlung geglättet sein.The surface according to the invention is formed on the circumference of a sheet-guiding cylinder such as the impression cylinder, transfer cylinder, turning or storage cylinder, but can also be provided on any other machine part that comes into contact with paint and can thereby become dirty.
A carrier layer 1 produced by the plasma coating process is applied to the cast base body of the cylinder. This is produced using metallic or metal oxide powders, which preferably have grain sizes between 5 and 50 µm. An adhesion promoter layer, not shown in the figures, can be provided between the carrier layer 1 and the base body.
The targeted setting of the parameters in plasma spraying results in random distribution of unaligned pores 2 in the carrier layer 1, which vary in size and have diameters of 5 to 10 μm. Depending on the parameters of the coating, microcracks can also occur. The carrier layer 1 can be structured out or smoothed by mechanical surface treatment.

Auf der Trägerschicht 1 ist eine Funktionsbeschichtung 5, 6 vorgesehen. A functional coating 5, 6 is provided on the carrier layer 1.

Die Funktionsbeschichtung 5, 6 kann aus einer oder mehreren Schichten bestehen. Sie ist so ausgeführt, dass zwischen Profilhöhe 3 und Profiltiefe 4 eine Höhendifferenz erhalten bleibt. Zudem ist die Gesamtschichtdicke der Funktionsbeschichtung 5, 6 kleiner als der Durchmesser der Poren 2 des Trägermaterials, d.h. das die aussummierte Dicke der sich im Inneren der Poren 2 gegenüberliegenden Bereiche der Funktionsbeschichtung 5, 6 stets kleiner als der Porendurchmesser ist.The functional coating 5, 6 can consist of one or more layers. she is executed in such a way that a height difference is obtained between profile height 3 and profile depth 4 remains. In addition, the total layer thickness of the functional coating 5, 6 is smaller than that Diameter of the pores 2 of the carrier material, i.e. which is the total thickness of the Areas of the functional coating 5, 6 that always lie opposite the pores 2 is smaller than the pore diameter.

Als Beschichtungsmaterial finden modifizierte anorganische Nanopartikel Verwendung, die in wässrigen, alkoholischen oder daraus gemischten Lösungsmitteln gelöst sind und durch Hydrolyseprodukte von langkettigen Trialkoxysilanen R-Si(OR)3 und/oder Dialkoxysilanen R-Si(OR)2 modifiziert sind, wobei R 4 bis 18 Kohlenstoffatome in Alkyl-, Aralkyl, oder Fluoralkylresten enthält. Ebenso kann für die Modifikation der anorganischen Nanosole die Verwendung von Polysiloxanen mit endständigen Alkyl-, Aryl-, Hydroxyalkyl, Epoxy- oder Polyether-Resten vorgesehen sein. Die Nanopartikel, deren Durchmesser kleiner 10 nm ist, sind Bestandteil einer flüssigen Dispersion.
Die Beschichtung ist in einfacher Weise unter Anwendung des Sol-Gel-Verfahrens zu erzeugen. Dazu wird das erzeugte Nanosol durch bekannte Beschichtungsverfahren, wie Sprüh-, Streich-, Tauch-, Schleuder- oder Tauchbegussbeschichtung mit definierter Beschichtungsdicke aufgebracht. Die Beschichtungslösung verteilt sich gleichmäßig auf der Oberfläche der Trägerschicht 1 und dringt auch in das Innere der Poren 2 in der Trägerschicht 1 ein, ohne jedoch die Poren 2 zuzusetzen.
In ihrem Bestreben, das extrem große Oberflächen/Volumenverhältnis zu reduzieren, orientieren sich die Nanopartikel und das Sol geliert. Der Schicht wird im weiteren Verlauf durch Trocknung das Lösungsmittel entzogen. Die angetrocknete Schicht kann anschließend durch Tempern bei Temperaturen zwischen 100 und 400°C fixiert werden.
Die in dieser Weise erzeugte Funktionsbeschichtung 5, 6 ist oleophob und wirkt einer Verschmutzung mit ölbasierter Druckfarbe entgegen. Die relative Beständigkeit der Funktionsbeschichtung 5, 6 ergibt sich aus der Tatsache, dass Teile der Beschichtung in den Poren 2 der Trägerschicht 1 verankert sind. Sollte sich die Funktionsbeschichtung 5, 6 durch mechanischen Verschleiß abnutzen, kann der Beschichtungsprozess wiederholt werden. Die Poren 2 bieten auch für weitere Beschichtungsprozess ausreichend Angriffspunkte für die Verankerung der Funktionsbeschichtung 5, 6. Das wird in Fig. 2 deutlich, in der einer ersten Schicht der Funktionsbeschichtung 5 eine zweite Schicht 6 überlagert ist. Damit ist es möglich, die Oberfläche und damit auch deren Eigenschaften zu regenerieren.Modified inorganic nanoparticles are used as coating material, which are dissolved in aqueous, alcoholic or mixed solvents and modified by hydrolysis products of long-chain trialkoxysilanes R-Si (OR) 3 and / or dialkoxysilanes R-Si (OR) 2 , where R 4 to Contains 18 carbon atoms in alkyl, aralkyl, or fluoroalkyl radicals. Likewise, the use of polysiloxanes with terminal alkyl, aryl, hydroxyalkyl, epoxy or polyether radicals can be provided for the modification of the inorganic nanosols. The nanoparticles, whose diameter is less than 10 nm, are part of a liquid dispersion.
The coating can be produced in a simple manner using the sol-gel process. For this purpose, the nanosol produced is applied by known coating methods, such as spray, brush, dip, spin or dip coating, with a defined coating thickness. The coating solution is distributed uniformly on the surface of the carrier layer 1 and also penetrates into the interior of the pores 2 in the carrier layer 1, but without clogging the pores 2.
In their endeavor to reduce the extremely large surface / volume ratio, the nanoparticles are oriented and the sol gels. The solvent is subsequently removed from the layer by drying. The dried layer can then be fixed by tempering at temperatures between 100 and 400 ° C.
The functional coating 5, 6 produced in this way is oleophobic and counteracts contamination with oil-based printing ink. The relative resistance of the functional coating 5, 6 results from the fact that parts of the coating are anchored in the pores 2 of the carrier layer 1. If the functional coating 5, 6 wears out due to mechanical wear, the coating process can be repeated. The pores 2 also offer sufficient points of attack for anchoring the functional coating 5, 6 for further coating processes. This becomes clear in FIG. 2, in which a second layer 6 is superimposed on a first layer of the functional coating 5. This makes it possible to regenerate the surface and thus its properties.

Bei einer anderen Ausführungsformen kann die Oberfläche des Maschinenteils raustrukturiert sein. Die Raustruktur wird so eingestellt, dass sie auch durch das Aufbringen des Trägermaterials nicht eingeebnet wird. Durch die Ausbildung der Raustruktur der Oberfläche des Maschinenteils wird erreicht, dass der zu transportierende Druckbogen nur mit einem Teil der Oberfläche des bogenführenden Elements, nämlich den erhabenen Stellen der Topographie der beschichteten Oberfläche in Kontakt kommt. Das Abziehen der Druckfarbe wird bedingt durch die geometrische Struktur der Bereiche zusätzlich begünstigt.In another embodiment, the surface of the machine part can be structured his. The structure is adjusted in such a way that it can also be applied by applying the carrier material is not leveled. Through the formation of the surface structure of the machine part is achieved that the printed sheet to be transported with only one Part of the surface of the arch-guiding element, namely the raised areas of the topography the coated surface comes into contact. Peeling off the ink is additionally favored due to the geometric structure of the areas.

Durch das Zusammenwirken der sich aus der Oberflächenstruktur ergebenden physikalischen Effekte zusammen mit den sich aus der Beschaffenheit der Funktionsbeschichtung 5, 6 ergebenden chemischen Effekten wird die Benetzbarkeit der Oberfläche gegenüber Druckfarbe auf ein Minimum reduziert.Through the interaction of the physical resulting from the surface structure Effects together with those resulting from the nature of the functional coating 5, The resulting chemical effects are compared to the wettability of the surface Printing ink reduced to a minimum.

Bei einer Ausführung der Funktionsbeschichtung 5, 6 mit modifizierten Verbindungen von Siliziumoxid mit Aluminiumoxid als Nanosol, das unter Verwendung einer 10 %igen Lösung von fluoralkylfunktionalisierten Polysiloxanen modifiziert ist, weist die Oberfläche auch verstärkt gegenüber Wasser schlechte Benetzbarkeit auf.
Mit der vorgenannten Ausführung kann damit auch der Verschmutzung der Oberflächen durch Anlagerung von in Wasser gelösten Schmutzpartikeln entgegengewirkt werden. When the functional coating 5, 6 is designed with modified compounds of silicon oxide with aluminum oxide as nanosol, which is modified using a 10% solution of fluoroalkyl-functionalized polysiloxanes, the surface also has poor wettability with respect to water.
With the aforementioned embodiment, the contamination of the surfaces by the accumulation of dirt particles dissolved in water can also be counteracted.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Trägerschichtbacking
22
Porepore
33
Profilhöheprofile height
44
Profiltiefetread depth
55
erste Schicht der Funktionsbeschichtungfirst layer of functional coating
66
zweite Schicht der Funktionsbeschichtungsecond layer of functional coating

Claims (18)

Oberfläche für Maschinenteile einer Druckmaschine, insbesondere Bogenleitelemente oder bogenführende Zylinder, die mit Druckfarbe in Berührung kommen und dabei verschmutzen können, aufgebaut aus einem Grundmaterial mit Trägerschicht und einer die Trägerschicht überziehenden oleophoben Funktionsbeschichtung, dadurch gekennzeichnet, dass die Trägerschicht (1) Poren (2) aufweist in deren Innenraum die ein- oder mehrschichtige Funktionsbeschichtung (5, 6) hineinreicht und deren Gesamtschichtdicke kleiner ist als der Durchmesser der Poren (2) der Trägerschicht (1).Surface for machine parts of a printing press, in particular sheet guiding elements or sheet-guiding cylinders which come into contact with printing ink and can thereby become dirty, built up from a base material with a base layer and an oleophobic functional coating covering the base layer, characterized in that the base layer (1) has pores (2) has in the interior of the single or multi-layer functional coating (5, 6) and the total layer thickness is smaller than the diameter of the pores (2) of the carrier layer (1). Oberfläche nach Anspruch 1, dadurch gekennzeichnet, dass die Poren (2) unausgerichtet zueinander verlaufen und unregelmäßigen Durchmesser aufweisen.Surface according to claim 1, characterized in that the pores (2) run unaligned with each other and have irregular diameters. Oberfläche nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Poren (2) Durchmesser im Bereich von 5 bis 10 µm aufweisen.Surface according to Claim 1 or 2, characterized in that the pores (2) have diameters in the range from 5 to 10 µm. Oberfläche nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Trägerschicht (1) durch thermisches Spritzen erzeugt ist.Surface according to one of claims 1 to 3, characterized in that the carrier layer (1) is produced by thermal spraying. Oberfläche nach Anspruch 4, dadurch gekennzeichnet, dass die Trägerschicht (1) durch Plasmabeschichtung mit metallischen oder metalloxidischen Pulvern der Korngrößen von 5 bis 50 µm aufgebracht ist.Surface according to claim 4, characterized in that the carrier layer (1) is applied by plasma coating with metallic or metal oxide powders with grain sizes of 5 to 50 µm. Oberfläche nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die Trägerschicht (1) oleophobe Eigenschaften aufweist.Surface according to one of claims 1 to 5, characterized in that the carrier layer (1) has oleophobic properties. Oberfläche nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass zur Funktionsbeschichtung (5, 6) ein anorganisches Nanosol verwendet wird, das beim Trocknen geliert.Surface according to one of claims 1 to 6, characterized in that an inorganic nanosol is used for the functional coating (5, 6), which gels during drying. Oberfläche nach Anspruch 7, dadurch gekennzeichnet, dass die Beschichtung im Sol-Gel-Verfahren aufgebracht ist.Surface according to claim 7, characterized in that the coating is applied in the sol-gel process. Oberfläche nach Anspruch 7, dadurch gekennzeichnet, dass die Nanosol-Beschichtung durch Sprüh-, Streich-, Tauch-, Schleuder- oder Tauchbegussbeschichtung aufgebracht ist. Surface according to claim 7, characterized in that the nanosol coating is applied by spray, brush, dip, spin or dip coating. Oberfläche nach Anspruch 7, dadurch gekennzeichnet, dass die Nanosol-Beschichtung aus mit organischen Zusätzen modifizierten anorganischen Nanopartikeln besteht.Surface according to claim 7, characterized in that the nanosol coating consists of inorganic nanoparticles modified with organic additives. Oberfläche nach Anspruch 10, dadurch gekennzeichnet, dass die Nanopartikel aus Oxiden der Elemente der II. bis V. Haupt- und Nebengruppe oder deren Gemischen bestehen.Surface according to claim 10, characterized in that the nanoparticles consist of oxides of the elements of the II. To V. main and sub-group or mixtures thereof. Oberfläche nach Anspruch 10 oder 11, dadurch gekennzeichnet, dass die Nanopartikel aus Siliziumoxid, Titanoxid, Aluminiumoxid, Zirkoniumoxid oder deren Gemischen bestehen.Surface according to claim 10 or 11, characterized in that the nanoparticles consist of silicon oxide, titanium oxide, aluminum oxide, zirconium oxide or mixtures thereof. Oberfläche nach Anspruch 10, dadurch gekennzeichnet, dass als organische Zusätze Hydrolyseprodukte von langkettigen Trialkoxysilanen R-Si(OR)3 und/oder Dialkoxysilanen R-Si(OR)2 bestehen, wobei R 4 bis 18 Kohlenstoffatome in Alkyl-, Aralkyl, oder Fluoralkylresten enthält.Surface according to claim 10, characterized in that as organic additives there are hydrolysis products of long-chain trialkoxysilanes R-Si (OR) 3 and / or dialkoxysilanes R-Si (OR) 2 , where R has 4 to 18 carbon atoms in alkyl, aralkyl or fluoroalkyl radicals contains. Oberfläche nach Anspruch 10, dadurch gekennzeichnet, dass als organische Zusätze Polysiloxane mit endständigen Alkyl-, Aryl-, Hydroxyalkyl, Epoxy- oder Polyether-Resten vorgesehen sind.Surface according to Claim 10, characterized in that polysiloxanes with terminal alkyl, aryl, hydroxyalkyl, epoxy or polyether radicals are provided as organic additives. Oberfläche nach Anspruch 10, dadurch gekennzeichnet, dass die nanokristalllinen Partikel aus einer Siliziumoxid/Aluminiumoxid Verbindung bestehen, die mit Fluoralkylsilanen oder fluoralkylfunktionalisierten Polysiloxanen modifiziert ist.Surface according to claim 10, characterized in that the nanocrystalline particles consist of a silicon oxide / aluminum oxide compound which is modified with fluoroalkylsilanes or fluoroalkyl-functionalized polysiloxanes. Oberfläche nach einem der Ansprüche 7 bis 15, dadurch gekennzeichnet, dass die Nanosol-Beschichtung mittels thermischer Nachbehandlung im Bereich von 100 bis 400°C fixiert wird.Surface according to one of Claims 7 to 15, characterized in that the nanosol coating is fixed in the range from 100 to 400 ° C by means of thermal aftertreatment. Oberfläche nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die oleophoben Eigenschaften durch Aufbringen der Funktionsbeschichtung (5, 6) mit anschließender Temperung regenerierbar sind. Surface according to one of the preceding claims, characterized in that the oleophobic properties can be regenerated by applying the functional coating (5, 6) with subsequent tempering. Oberfläche nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Grundmaterial und/oder die Trägerschicht (1) eine raustrukturierte Oberfläche aufweisen.Surface according to one of the preceding claims, characterized in that the base material and / or the carrier layer (1) have a structured surface.
EP20030002783 2002-03-01 2003-02-07 Surface of machine parts of a printing machine Expired - Lifetime EP1340616B1 (en)

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US20100092842A1 (en) * 2007-02-09 2010-04-15 The University Of British Columbia Densified ceramic materials and related methods
US8153834B2 (en) 2007-12-05 2012-04-10 E.I. Dupont De Nemours And Company Surface modified inorganic particles

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US8153834B2 (en) 2007-12-05 2012-04-10 E.I. Dupont De Nemours And Company Surface modified inorganic particles

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DE50313196D1 (en) 2010-12-02
EP1340616A3 (en) 2008-03-05
DE10209297A1 (en) 2003-09-18

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