EP1375143B1 - Method for treating the surface of impression cylinders - Google Patents

Method for treating the surface of impression cylinders Download PDF

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Publication number
EP1375143B1
EP1375143B1 EP20030009299 EP03009299A EP1375143B1 EP 1375143 B1 EP1375143 B1 EP 1375143B1 EP 20030009299 EP20030009299 EP 20030009299 EP 03009299 A EP03009299 A EP 03009299A EP 1375143 B1 EP1375143 B1 EP 1375143B1
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EP
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Prior art keywords
printing
treating
cylinder
coating liquid
circumferential surfaces
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EP20030009299
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German (de)
French (fr)
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EP1375143A1 (en
Inventor
Arndt Jentzsch
Roland Kühn
Olaf Schinkel
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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

Definitions

  • the present invention relates to a method for treating the lateral surfaces of printing cylinders of printing presses according to the preamble of patent claim 1.
  • the lateral surfaces of the printing cylinders in printing presses come into contact with printed sheets during the printing process.
  • the risk of contamination by printing ink exists in particular in the production of printed on both sides sheet. These are, after the printing process has been completed on the recto printing side, turned and fed to the subsequently arranged printing units, wherein the already printed side of the printed sheet faces the lateral surface of the printing cylinder.
  • the printing units downstream of the printing unit there is the danger that printing ink builds up on the printing cylinders and deposits on subsequent printing sheets as a result of the pressure prevailing in the printing gap, which leads to quality losses.
  • the lateral surfaces of the printing cylinders are also worn, which also affects the print quality.
  • films roughened on printing cylinders with ink-repellent properties Such a film is in the DE 12 58 873 A1 described. From the DE 101 15 876 A1 is a printing machine is known, the arc-guiding cylinder are covered with films which are provided with a titanium oxide or zinc oxide-containing, ink-repellent coating. To activate or refresh the color-repellent properties of the coating, it is irradiated with UV light at specific time intervals.
  • the pressure cylinder jacket is supplied with air enriched with water vapor.
  • the DE 43 20 069 discloses a method and apparatus for repairing cylinders of printing machines by thermal spray coating.
  • the device is installed in the printing machine when the surface of the cylinder in question is worn and in need of repair.
  • a part of the cylinder jacket is removed and thermally spray-coated after the blasting and heating operations, followed by smoothing and sealing of the applied layer.
  • the coating of the cylinder proves to be expensive. Due to the process-related high process temperatures in the thermal coating, additional dangers and high stress on the other machine components.
  • the invention has for its object to provide a method for treating the lateral surfaces of printing cylinders, while avoiding the aforementioned disadvantages, which ensures permanent protection for printing cylinder against contamination with printing ink.
  • the present invention has the advantage that very good ink-repellent and / or wear-inhibiting properties can be produced on the outer surfaces of the printing cylinders of a printing press and can be obtained over virtually any desired length of time.
  • a coating liquid is applied to the blanket cylinder, which is transferred to the printing cylinder during a rotation movement carried out by the printing cylinder and the blanket cylinder and then fixed on the printing cylinder.
  • the layer thickness is made uniform, which has an advantageous effect in terms of the desired properties.
  • the layer produced in this way is subject to wear, it can easily be regenerated as often as desired in the printing press.
  • the replacement of worn elevators or the time-consuming re-stratification of the cylinders by thermal spraying is eliminated.
  • the present invention is particularly suitable for use in sheet-fed rotary printing presses with a turning device, which can print the sheet in perfecting printing, but also finds application in pure straight printing presses.
  • the regeneration of the properties can be performed as an automated process during a printing pause, which requires no manual activities, in particular no installation work to change lifts.
  • An embodiment of the invention provides, in the presence of a washing device of known type to use this for applying the coating liquid to the cylinder surface.
  • the advantage of these embodiments is that manual operations are reduced to a minimum without additional mechanical engineering effort.
  • the coating liquid is easy to handle and is in liquid form at room temperature. It consists essentially of inorganic nanoparticles modified with organic additives, the nanoparticles being dissolved in aqueous, alcoholic or mixed solvents. This makes it chemically resistant, which makes storage easier.
  • the applied to the printing cylinder layer can be performed depending on the selection of nanoparticles as an ink-repellent and / or wear-inhibiting layer.
  • the fixation of the layer is carried out in the simplest way by drying or, depending on the design of the coating by irradiation with UV light.
  • the single drawing shows a schematic representation of the side view of a printing press.
  • the inventive method can be carried out with a printing press, which corresponds in the essential components of the sheet-fed press shown in the single drawing.
  • This has a support table 13 and a feed drum 14, are supplied to the isolated sheet the first, a plurality of printing units 1 arranged one behind the other.
  • Each of the printing units 1 comprises a cylinder 5 designed as a printing cylinder leading cylinder, which is in contact with a blanket cylinder 2, which is associated with a plate cylinder 3.
  • transfer drums 4 are arranged. All sheet-guiding cylinders are in a known manner and Way equipped with gripper systems.
  • One or more of the transfer drums 4 can also be designed as turning drums. In the illustrated printing machine, viewed in the sheet running direction, the second transfer drum 4 is a turning drum.
  • the process according to the invention is carried out.
  • first coating liquid is applied to one or more blanket cylinders 2, wherein different variants are possible.
  • a conventional washing device 8 or a separate applicator 11, for example in the form of a spray bar extending over the width of the blanket cylinder can be used for application.
  • the coating liquid is introduced into the receptacle provided for receiving a washing liquid and conveyed in the same way as this.
  • the washing device 8 can operate on the roll, brush or cloth principle, wherein it is set so that coating liquid remains in a predetermined layer thickness on the blanket cylinder 2.
  • the washing device 8 provided for application of the coating liquid can also be modified such that it can optionally be used for applying the coating liquid or cleaning. It is likewise possible to transfer the coating liquid with a dampening unit 7, which may be present on the printing press, to the plate cylinder 3, which transfers the coating liquid to the blanket cylinder 2 while performing a rotational movement.
  • the coating liquid is transferred to the impression cylinder 5 employed on the blanket cylinder 2 during a printing cylinder 5 and blanket cylinder 2 executed rotary motion on the impression cylinder 5
  • a film of coating liquid is formed on the printing cylinder 5, which has a uniform layer thickness.
  • the coating liquid used is an aqueous or alcoholic solution which is liquid at room temperature and inorganic nanoparticles modified with organic additives contains.
  • the nanoparticles consist of oxides of the elements of the ll. to V. main and subgroup or mixtures thereof, in particular of silicon oxide, titanium oxide, aluminum oxide, zirconium oxide or mixtures thereof.
  • Hydrolysis products of long-chain trialkoxysilanes R-Si (OR) 3 and / or dialkoxysilanes R-Si (OR) 2 wherein R contains from 4 to 18 carbon atoms in alkyl, aralkyl, or fluoroalkyl radicals, are provided as organic additives.
  • a coating liquid whose nanocrystalline particles consist of a silicon oxide / aluminum oxide compound which has been modified with fluoroalkylsilanes or fluoroalkyl-functionalized polysiloxanes has proven to be particularly suitable.
  • the coating liquid may furthermore contain a photoinitiator which reacts in a known manner to a specific partial spectrum of electromagnetic radiation, in particular UV light, and initiates the fixing process.
  • the coating produced using such a coating liquid on the sheet-guiding cylinders has a strong ink-repelling effect, so that a sheet-guiding cylinder is protected against contamination by printing ink.
  • the coating liquid After transferring the coating liquid to the surface of the printing cylinder 5, the coating liquid is fixed. This can easily be done by heat treatment in the form of drying or depending on the composition of the coating liquid by irradiation with UV light or another suitable radiation source. This initiates crosslinking reactions which irreversibly connect the molecules contained in the coating liquid.
  • temperatures in the range between 15 and 100 ° C are provided.
  • the printing cylinders 5 are associated with drying devices 12. Even with the coating liquids which can be fixed at room temperature, the use of such drying devices 12 for shortening the drying process proves to be advantageous.
  • the drying devices 12 work with hot air or IR radiation. Instead of the drying devices 12 and UV emitters can be provided.
  • the remaining on the blanket cylinder 2 coating liquid is removed before the start of the printing process and before it dries.
  • the blanket cylinder 2 is turned off by the printing cylinder 5 and washed. This can be done manually or using a washing device.
  • the coating process is preceded by a cleaning process, for the implementation of which a separate washing device 5 or a washing device 5 which can optionally be assigned to the blanket cylinder 2, the plate cylinder 3 or the impression cylinder 5, can be provided.
  • the washing device 5 is arranged so that it can perform a pivoting movement 9.

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

Description

Die vorliegende Erfindung bezieht sich auf ein Verfahren zum Behandeln der Mantelflächen von Druckzylindern von Druckmaschinen gemäß dem Oberbegriff von Patentanspruch 1.The present invention relates to a method for treating the lateral surfaces of printing cylinders of printing presses according to the preamble of patent claim 1.

Die Mantelflächen der Druckzylinder in Druckmaschinen treten während des Druckprozesses mit bedruckten Bogen in Kontakt. Die Gefahr der Verschmutzung durch Druckfarbe besteht insbesondere bei der Herstellung von beidseitig bedruckten Druckbogen. Diese werden, nachdem der Druckprozess auf der Schöndruckseite abgeschlossen ist, gewendet und den nachfolgend angeordneten Druckwerken zugeführt, wobei die bereits bedruckte Seite der Druckbogen der Mantelfläche des Druckzylinders zugewandt ist.
Insbesondere in den der Bogenwendeeinrichtung nachgeordneten Druckwerken besteht durch den im Druckspalt herrschenden Druck die Gefahr, dass sich Druckfarbe auf den Druckzylindern aufbaut und auf Folgedruckbogen ablagert, was zu Qualitätseinbußen führt. Infolge der fortgesetzten Kontakte mit den Druckbogen werden die Mantelflächen der Druckzylinder zudem abgenutzt, was ebenfalls die Druckqualität beeinflusst.The lateral surfaces of the printing cylinders in printing presses come into contact with printed sheets during the printing process. The risk of contamination by printing ink exists in particular in the production of printed on both sides sheet. These are, after the printing process has been completed on the recto printing side, turned and fed to the subsequently arranged printing units, wherein the already printed side of the printed sheet faces the lateral surface of the printing cylinder.
In particular, in the printing units downstream of the printing unit there is the danger that printing ink builds up on the printing cylinders and deposits on subsequent printing sheets as a result of the pressure prevailing in the printing gap, which leads to quality losses. As a result of the continued contact with the printing sheets, the lateral surfaces of the printing cylinders are also worn, which also affects the print quality.

Es ist allgemein bekannt, auf Druckzylindern aufgeraute Folien mit farbabweisenden Eigenschaften anzuordnen. Eine derartige Folie ist in der DE 12 58 873 A1 beschrieben. Aus der DE 101 15 876 A1 ist eine Druckmaschine bekannt, deren bogenführende Zylinder mit Folien bespannt werden, die mit einer Titanoxid oder Zinkoxid enthaltenden, farbabweisenden Beschichtung versehen sind. Zur Aktivierung bzw. Auffrischung der farbabweisenden Eigenschaften der Beschichtung wird diese in bestimmten zeitlichen Abständen mit UV-Licht bestrahlt.It is generally known to arrange films roughened on printing cylinders with ink-repellent properties. Such a film is in the DE 12 58 873 A1 described. From the DE 101 15 876 A1 is a printing machine is known, the arc-guiding cylinder are covered with films which are provided with a titanium oxide or zinc oxide-containing, ink-repellent coating. To activate or refresh the color-repellent properties of the coating, it is irradiated with UV light at specific time intervals.

Nachteilig ist an diesen Lösungen, dass die Folien zur Aufrechterhaltung der farbabweisenden Eigenschaften und damit zur Gewährleistung guter Druckqualität nach einer vorbestimmten Benutzungsdauer ausgetauscht werden müssen.A disadvantage of these solutions that the films must be replaced after a predetermined period of use to maintain the color-repellent properties and thus to ensure good print quality.

Es ist nach der DE 199 48 311 A1 ferner die Verwendung einer Beschichtungszusammensetzung mit niedriger Oberflächenenergie für Teile einer Druckmaschine bekannt. Die mit der Beschichtungszusammensetzung erzeugte Oberfläche nutzt sich jedoch während des Betriebs der Maschine schnell ab.It is after the DE 199 48 311 A1 Further, the use of a low surface energy coating composition for parts of a printing press is known. However, the surface created with the coating composition quickly wears away during operation of the machine.

Gemäß der Druckschrift DE OS 21 27 021 soll das Ablegen von Farbe und der Farbaufbau auf den Zylindermantel durch das Auftragen einer Wasserschicht vermieden werden. Das Wasser wirkt dabei als Trennmittel. Zur Erzeugung der Wasserschicht wird dem Druckzylindermantel gezielt mit Wasserdampf angereicherte Luft zugeführt.According to the document DE OS 21 27 021 should the deposition of color and the color structure on the cylinder jacket by applying a layer of water to be avoided. The Water acts as a release agent. To generate the water layer, the pressure cylinder jacket is supplied with air enriched with water vapor.

Die DE 43 20 069 offenbart ein Verfahren und eine Vorrichtung zur Reparatur von Zylindern von Druckmaschinen durch thermische Spritzbeschichtung. Die Vorrichtung wird in die Druckmaschine eingebaut, wenn die Oberfläche des betreffenden Zylinders verschlissen und reparaturbedürftig ist. Bei der Durchführung des Verfahrens wird ein Teil des Zylindermantels abgetragen und nach den Arbeitsgängen Strahlen und Erwärmen thermisch spritzbeschichtet, woran sich das Glätten und Versiegeln der aufgebrachten Schicht anschließt. Die Beschichtung des Zylinders erweist sich als aufwändig. Durch die verfahrenstechnisch bedingten hohen Prozesstemperaturen bei der thermischen Beschichtung ergeben sich zusätzliche Gefahren und eine hohe Beanspruchung der anderen Maschinenkomponenten.The DE 43 20 069 discloses a method and apparatus for repairing cylinders of printing machines by thermal spray coating. The device is installed in the printing machine when the surface of the cylinder in question is worn and in need of repair. In carrying out the process, a part of the cylinder jacket is removed and thermally spray-coated after the blasting and heating operations, followed by smoothing and sealing of the applied layer. The coating of the cylinder proves to be expensive. Due to the process-related high process temperatures in the thermal coating, additional dangers and high stress on the other machine components.

Der Erfindung liegt die Aufgabe zugrunde, unter Vermeidung der vorgenannten Nachteile ein Verfahren zum Behandeln der Mantelflächen von Druckzylindern zu schaffen, das einen dauerhaften Schutz für Druckzylinder gegen Verschmutzung mit Druckfarbe gewährleistet.The invention has for its object to provide a method for treating the lateral surfaces of printing cylinders, while avoiding the aforementioned disadvantages, which ensures permanent protection for printing cylinder against contamination with printing ink.

Erfindungsgemäß wird diese Aufgabe mit einem Verfahren zum Behandeln der Mantelflächen von Druckzylindern der eingangs genannten Art, das die Merkmale des Patentanspruchs 1 aufweist, gelöst.This object is achieved with a method for treating the lateral surfaces of printing cylinders of the type mentioned, having the features of claim 1, solved.

Die vorliegende Erfindung hat den Vorteil, dass sich sehr gute farbabweisende und/oder verschleißhemmende Eigenschaften auf den Mantelflächen der Druckzylinder einer Druckmaschine erzeugen und über nahezu beliebig lange Zeiträume erhalten lassen. Dazu wird auf den Gummituchzylinder eine Beschichtungsflüssigkeit aufgetragen, die während einer von Druckzylinder und Gummituchzylinder ausgeführten Drehbewegung auf den Druckzylinder übertragen und anschließend auf dem Druckzylinder fixiert wird. Durch das indirekte Aufbringen wird die Schichtdicke vergleichmäßigt, was sich vorteilhaft in Bezug auf die gewünschten Eigenschaften auswirkt.The present invention has the advantage that very good ink-repellent and / or wear-inhibiting properties can be produced on the outer surfaces of the printing cylinders of a printing press and can be obtained over virtually any desired length of time. For this purpose, a coating liquid is applied to the blanket cylinder, which is transferred to the printing cylinder during a rotation movement carried out by the printing cylinder and the blanket cylinder and then fixed on the printing cylinder. By indirect application, the layer thickness is made uniform, which has an advantageous effect in terms of the desired properties.

Die derart erzeugte Schicht unterliegt zwar einem Verschleiß, kann aber leicht und beliebig oft in der Druckmaschine regeneriert werden. Der Austausch von verschlissenen Aufzügen oder das aufwändige Neubeschichten der Zylinder durch thermisches Spritzen entfällt.Although the layer produced in this way is subject to wear, it can easily be regenerated as often as desired in the printing press. The replacement of worn elevators or the time-consuming re-stratification of the cylinders by thermal spraying is eliminated.

Die vorliegende Erfindung eignet sich besonders für den Einsatz in Bogenrotationsdruckmaschinen mit Wendeeinrichtung, die den Bogen im Schön- und Widerdruck bedrucken können, findet aber auch Anwendung in reinen Schöndruckmaschinen. Die Regeneration der Eigenschaften kann als automatisierter Prozess während einer Druckpause durchgeführt werden, wozu es keiner manuellen Tätigkeiten, insbesondere keiner Montagearbeiten zum Wechseln von Aufzügen bedarf.The present invention is particularly suitable for use in sheet-fed rotary printing presses with a turning device, which can print the sheet in perfecting printing, but also finds application in pure straight printing presses. The regeneration of the properties can be performed as an automated process during a printing pause, which requires no manual activities, in particular no installation work to change lifts.

Zur Durchführung des erfindungsgemäßen Verfahrens bedarf es keiner zusätzlichen Einrichtungen.
Eine Ausgestaltung der Erfindung sieht vor, bei Vorhandensein einer Wascheinrichtung bekannter Bauart diese zum Aufbringen der Beschichtungsflüssigkeit auf die Zylinderoberfläche zu verwenden. Der Vorteil dieser Ausgestaltungen liegt darin, dass manuelle Tätigkeiten auf ein Minimum reduziert werden, ohne dass zusätzlicher maschinenbaulicher Aufwand entsteht.To carry out the method according to the invention, there is no need for additional facilities.
An embodiment of the invention provides, in the presence of a washing device of known type to use this for applying the coating liquid to the cylinder surface. The advantage of these embodiments is that manual operations are reduced to a minimum without additional mechanical engineering effort.

Ein weiterer Vorteil der Erfindung besteht darin, dass die Beschichtungsflüssigkeit leicht zu handhaben ist und bei Raumtemperatur in flüssiger Form vorliegt. Sie besteht im Wesentlichen aus mit organischen Zusätzen modifizierten anorganischen Nanopartikeln, wobei die Nanopartikel in wässrigen, alkoholischen oder daraus gemischten Lösungsmitteln gelöst sind. Damit ist sie chemisch beständig, wodurch die Aufbewahrung erleichtert wird.Another advantage of the invention is that the coating liquid is easy to handle and is in liquid form at room temperature. It consists essentially of inorganic nanoparticles modified with organic additives, the nanoparticles being dissolved in aqueous, alcoholic or mixed solvents. This makes it chemically resistant, which makes storage easier.

Die auf den Druckzylinder applizierte Schicht kann abhängig von der Auswahl der Nanopartikel als farbabweisende und/oder verschleißhemmende Schicht ausgeführt werden. Die Fixierung der Schicht erfolgt in einfachster Weise durch Trocknung oder je nach Ausführung der Beschichtung durch Bestrahlung mit UV-Licht.The applied to the printing cylinder layer can be performed depending on the selection of nanoparticles as an ink-repellent and / or wear-inhibiting layer. The fixation of the layer is carried out in the simplest way by drying or, depending on the design of the coating by irradiation with UV light.

Anhand eines Ausführungsbeispiels soll die nachfolgende Erfindung näher erläutert werden. Die einzige Zeichnung zeigt in schematischer Darstellung die Seitenansicht einer Druckmaschine.Reference to an embodiment, the following invention will be explained in more detail. The single drawing shows a schematic representation of the side view of a printing press.

Das erfindungsgemäße Verfahren kann mit einer Druckmaschine ausgeführt werden, die in den wesentlichen Baugruppen der in der einzigen Zeichnung dargestellten Bogendruckmaschine entspricht. Diese weist einen Anlagetisch 13 und eine Zuführtrommel 14 auf, mit der vereinzelte Bogen dem ersten, mehrerer hintereinander angeordneter Druckwerke 1 zugeführt werden. Jedes der Druckwerke 1 umfasst einen als Druckzylinder 5 ausgebildeten bogenführenden Zylinder, der mit einem Gummituchzylinder 2 in Kontakt steht, dem ein Plattenzylinder 3 zugeordnet ist. Zum Transport der Bogen zwischen den Druckwerken 1 sind Übergabetrommeln 4 angeordnet. Alle bogenführenden Zylinder sind in bekannter Art und Weise mit Greifersystemen ausgestattet. Eine oder mehrere der Übergabetrommeln 4 können zudem als Wendetrommeln ausgeführt sein. Bei der dargestellten Druckmaschine ist in Bogenlaufrichtung betrachtet die zweite Übergabetrommel 4 eine Wendetrommel.The inventive method can be carried out with a printing press, which corresponds in the essential components of the sheet-fed press shown in the single drawing. This has a support table 13 and a feed drum 14, are supplied to the isolated sheet the first, a plurality of printing units 1 arranged one behind the other. Each of the printing units 1 comprises a cylinder 5 designed as a printing cylinder leading cylinder, which is in contact with a blanket cylinder 2, which is associated with a plate cylinder 3. To transport the sheet between the printing units 1 transfer drums 4 are arranged. All sheet-guiding cylinders are in a known manner and Way equipped with gripper systems. One or more of the transfer drums 4 can also be designed as turning drums. In the illustrated printing machine, viewed in the sheet running direction, the second transfer drum 4 is a turning drum.

Sind die Mantelflächen der Druckzylinder 5 noch nicht mit einer farbabweisenden Schicht versehen, oder ist eine ursprünglich auf den Mantelflächen vorhandene farbabweisende und/oder verschleißhemmende Schicht abgenutzt, wird das erfindungsgemäße Verfahren durchgeführt.If the lateral surfaces of the printing cylinder 5 are not yet provided with an ink-repellent layer, or if an ink-repellent and / or wear-inhibiting layer originally present on the lateral surfaces is worn, the process according to the invention is carried out.

Dazu wird zunächst Beschichtungsflüssigkeit auf einem oder mehreren Gummituchzylindern 2 aufgebracht, wobei verschiedene Varianten möglich sind. So kann zum Aufbringen eine herkömmliche Wascheinrichtung 8 oder eine separate Auftrageinrichtung 11, z.B. in Form eines sich über die Breite des Gummituchzylinders erstreckenden Sprühbalkens verwendet werden.
Bei Verwendung einer herkömmlichen Wascheinrichtung 8 wird die Beschichtungsflüssigkeit in das zur Aufnahme einer Waschflüssigkeit vorgesehene Behältnis eingefüllt und auf gleichem Wege wie diese gefördert. Die Wascheinrichtung 8 kann nach dem Walzen-, Bürstenoder Tuchprinzip arbeiten, wobei sie so eingestellt ist, dass Beschichtungsflüssigkeit in einer vorbestimmten Schichtdicke auf dem Gummituchzylinder 2 verbleibt. Die zum Auftrag der Beschichtungsflüssigkeit vorgesehene Wascheinrichtung 8 kann auch derart modifiziert sein, dass sie wahlweise zum Aufbringen der Beschichtungsflüssigkeit oder Reinigen einsetzbar ist.
Ebenso ist es möglich, die Beschichtungsflüssigkeit mit einem ggf. an der Druckmaschine vorhandenen Feuchtwerk 7 auf den Plattenzylinder 3 zu übertragen, welcher die Beschichtungsflüssigkeit unter Ausführung einer Drehbewegung auf den Gummituchzylinder 2 überträgt.For this purpose, first coating liquid is applied to one or more blanket cylinders 2, wherein different variants are possible. Thus, a conventional washing device 8 or a separate applicator 11, for example in the form of a spray bar extending over the width of the blanket cylinder, can be used for application.
When using a conventional washing device 8, the coating liquid is introduced into the receptacle provided for receiving a washing liquid and conveyed in the same way as this. The washing device 8 can operate on the roll, brush or cloth principle, wherein it is set so that coating liquid remains in a predetermined layer thickness on the blanket cylinder 2. The washing device 8 provided for application of the coating liquid can also be modified such that it can optionally be used for applying the coating liquid or cleaning.
It is likewise possible to transfer the coating liquid with a dampening unit 7, which may be present on the printing press, to the plate cylinder 3, which transfers the coating liquid to the blanket cylinder 2 while performing a rotational movement.

Vom Gummituchzylinder 2 wird die Beschichtungsflüssigkeit bei auf dem Gummituchzylinder 2 angestelltem Druckzylinder 5 während einer von Druckzylinder 5 und Gummituchzylinder 2 ausgeführten Drehbewegung auf den Druckzylinder 5 übertragen
Bei dieser Übertragung entsteht infolge der im Druckspalt herrschenden Kräfteverhältnisse ein Film aus Beschichtungsflüssigkeit auf dem Druckzylinder 5, der eine gleichmäßige Schichtdicke aufweist.From the blanket cylinder 2, the coating liquid is transferred to the impression cylinder 5 employed on the blanket cylinder 2 during a printing cylinder 5 and blanket cylinder 2 executed rotary motion on the impression cylinder 5
As a result of the force relationships prevailing in the press nip, a film of coating liquid is formed on the printing cylinder 5, which has a uniform layer thickness.

Als Beschichtungsflüssigkeit wird eine wässrige oder alkoholische Lösung verwendet, die bei Raumtemperatur flüssig ist und mit organischen Zusätzen modifizierte anorganische Nanopartikel enthält. Die Nanopartikel bestehen aus Oxiden der Elemente der ll. bis V. Hauptund Nebengruppe oder deren Gemischen, insbesondere aus Siliziumoxid, Titanoxid, Aluminiumoxid, Zirkoniumoxid oder deren Gemischen. Als organische Zusätze sind Hydrolyseprodukte von langkettigen Trialkoxysilanen R-Si(OR)3 und/oder Dialkoxysilanen R-Si(OR)2, wobei R 4 bis 18 Kohlenstoffatome in Alkyl-, Aralkyl-, oder Fluoralkylresten enthält, vorgesehen. Als besonders geeignet hat sich eine Beschichtungsflüssigkeit erwiesen, deren nanokristalline Partikel aus einer Siiiziumoxid/Aluminiumoxid-Verbindung bestehen, die mit Fluoralkylsilanen oder fluoralkylfunktionalisierten Polysiloxanen modifiziert ist. Die Beschichtungsflüssigkeit kann weiterhin einen Photoinitiator enthalten, der in bekannter Weise auf ein bestimmtes Teilspektrum elektromagnetischer Strahlung, insbesondere UV-Licht, reagiert und den Fixierungsprozess eingeleitet. Die unter Verwendung einer derartigen Beschichtungsflüssigkeit auf den bogenführenden Zylindern erzeugte Beschichtung wirkt stark farbabweisend, so dass ein bogenführender Zylinder gegen Verschmutzung mit Druckfarbe geschützt ist. Abhängig von der Zusammensetzung der Beschichtungsflüssigkeit können alternativ oder zusätzlich zu den farbabweisenden Eigenschaften auch verschleißhemmende Eigenschaften eingestellt werden.The coating liquid used is an aqueous or alcoholic solution which is liquid at room temperature and inorganic nanoparticles modified with organic additives contains. The nanoparticles consist of oxides of the elements of the ll. to V. main and subgroup or mixtures thereof, in particular of silicon oxide, titanium oxide, aluminum oxide, zirconium oxide or mixtures thereof. Hydrolysis products of long-chain trialkoxysilanes R-Si (OR) 3 and / or dialkoxysilanes R-Si (OR) 2 , wherein R contains from 4 to 18 carbon atoms in alkyl, aralkyl, or fluoroalkyl radicals, are provided as organic additives. A coating liquid whose nanocrystalline particles consist of a silicon oxide / aluminum oxide compound which has been modified with fluoroalkylsilanes or fluoroalkyl-functionalized polysiloxanes has proven to be particularly suitable. The coating liquid may furthermore contain a photoinitiator which reacts in a known manner to a specific partial spectrum of electromagnetic radiation, in particular UV light, and initiates the fixing process. The coating produced using such a coating liquid on the sheet-guiding cylinders has a strong ink-repelling effect, so that a sheet-guiding cylinder is protected against contamination by printing ink. Depending on the composition of the coating liquid, it is also possible, as an alternative or in addition to the color-repelling properties, to adjust wear-inhibiting properties.

Nach dem Übertragen der Beschichtungsflüssigkeit auf die Oberfläche des Druckzylinders 5 wird die Beschichtungsflüssigkeit fixiert. Das kann in einfacher Weise durch Wärmebehandlung in Form einer Trocknung oder abhängig von der Zusammensetzung der Beschichtungsflüssigkeit durch Bestrahlung mit UV-Licht oder einer anderen geeigneten Strahlungsquelle erfolgen. Damit werden Vernetzungsreaktionen ausgelöst, über die die in der Beschichtungsflüssigkeit enthaltenen Molekülen irreversibel miteinander verbunden werden.
Zur Trocknung sind Temperaturen im Bereich zwischen 15 und 100°C vorgesehen. Um diese zu erreichen, sind den Druckzylindern 5 Trocknungseinrichtungen 12 zugeordnet. Auch bei den bei Raumtemperatur fixierbaren Beschichtungsflüssigkeiten erweist sich der Einsatz derartiger Trocknungseinrichtungen 12 zur Verkürzung des Trocknungsprozesses als vorteilhaft. Die Trocknungseinrichtungen 12 arbeiten mit Heißluft oder IR-Strahlung. Anstelle der Trocknungseinrichtungen 12 können auch UV-Strahler vorgesehen sein.After transferring the coating liquid to the surface of the printing cylinder 5, the coating liquid is fixed. This can easily be done by heat treatment in the form of drying or depending on the composition of the coating liquid by irradiation with UV light or another suitable radiation source. This initiates crosslinking reactions which irreversibly connect the molecules contained in the coating liquid.
For drying, temperatures in the range between 15 and 100 ° C are provided. To achieve this, the printing cylinders 5 are associated with drying devices 12. Even with the coating liquids which can be fixed at room temperature, the use of such drying devices 12 for shortening the drying process proves to be advantageous. The drying devices 12 work with hot air or IR radiation. Instead of the drying devices 12 and UV emitters can be provided.

Die auf dem Gummituchzylinder 2 verbliebene Beschichtungsflüssigkeit wird vor Beginn des Druckprozesses und bevor es antrocknet entfernt. Dazu wird der Gummituchzylinder 2 vom Druckzylinder 5 abgestellt und gewaschen. Das kann manuell oder unter Verwendung einer Wascheinrichtung erfolgen.The remaining on the blanket cylinder 2 coating liquid is removed before the start of the printing process and before it dries. For this purpose, the blanket cylinder 2 is turned off by the printing cylinder 5 and washed. This can be done manually or using a washing device.

Vor dem Aufbringen der Beschichtungsflüssigkeit muss sichergestellt werden, dass die 0-berfläche der Druckzylinder 5 frei von Verschmutzungen ist. Ist das nicht der Fall, geht dem Beschichtungsvorgang ein Reinigungsvorgang voraus, zu dessen Durchführung eine separate Wascheinrichtung 5 oder eine Wascheinrichtung 5 die wahlweise dem Gummituchzylinder 2, dem Plattenzylinder 3 oder dem Druckzylinder 5 zuordenbar ist, vorgesehen sein kann. Dazu ist die Wascheinrichtung 5 so angeordnet, dass sie eine Schwenkbewegung 9 ausführen kann.Before applying the coating liquid, it must be ensured that the surface of the printing cylinder 5 is free from contamination. If this is not the case, the coating process is preceded by a cleaning process, for the implementation of which a separate washing device 5 or a washing device 5 which can optionally be assigned to the blanket cylinder 2, the plate cylinder 3 or the impression cylinder 5, can be provided. For this purpose, the washing device 5 is arranged so that it can perform a pivoting movement 9.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Druckwerkprinting unit
22
GummituchzylinderBlanket cylinder
33
Plattenzylinderplate cylinder
44
ÜbergabetrommelTransfer drum
55
Druckzylinderpressure cylinder
66
Farbwerkinking
77
Feuchtwerkdampening
88th
Wascheinrichtungwash
99
Schwenkbewegungpivotal movement
1010
Tuchcloth
1111
Auftrageinrichtungapplicator
1212
Trocknungseinrichtungdrying device
1313
Anlagetischfeed table
1414
Zuführtrommelfeed drum

Claims (16)

  1. Method of treating the circumferential surfaces of printing cylinders of printing machines in the state of being installed in the printing machine, wherein a plate cylinder (3) which co-operates with an inking mechanism (6) or with an inking mechanism (6) and a moistening mechanism (7) is associated with the respective printing cylinder (5) by way of a rubber blanket cylinder (2), characterised in that a coating liquid, which fixes an ink repelling layer and/or forms a wear-inhibiting layer, is coated on the rubber blanket cylinder (2) and is transferred to the printing cylinder (5) and fixed there when the rubber blanket cylinder (2) is placed against the printing cylinder (5) and during a rotational movement executed by printing cylinder (5) and rubber blanket cylinder (2).
  2. Method of treating the circumferential surfaces of printing cylinders according to claim 1, wherein the coating liquid is coated by a washing device (8) associated with the rubber blanket cylinder (2).
  3. Method of treating the circumferential surfaces of printing cylinders according to claim 2, wherein the coating liquid is coated by a washing device (8) selectably usable for coating the coating liquid or for cleaning.
  4. Method of treating the circumferential surfaces of printing cylinders according to claim 1, wherein the coating liquid is coated on the plate cylinder (3) by the moistening mechanism (7) or the inking mechanism (6) and is transferred to the rubber blanket cylinder (2) during a rotational movement executed by plate cylinder (3) and rubber blanket cylinder (2).
  5. Method of treating the circumferential surfaces of printing cylinders according to claim 1, wherein the coating liquid is coated on the rubber blanket cylinder (2) by a spray bar extending over the width of the rubber blanket cylinder.
  6. Method of treating the circumferential surfaces of printing cylinders according to one of claims 1 to 5, wherein the coating liquid is fixed by drying at temperatures between 15 and 100° C.
  7. Method of treating the circumferential surfaces of printing cylinders according to one of claims 1 to 5, wherein the coating liquid is fixed by irradiation with ultraviolet light.
  8. Method of treating the circumferential surfaces of printing cylinders according to one of the preceding claims, wherein the printing cylinder (5) is cleaned before the coating of the coating liquid.
  9. Method of treating the circumferential surfaces of printing cylinders according to claim 8, wherein the cleaning takes place with a washing device (8) able to be selectably associated with the printing cylinder (5) or the rubber blanket cylinder (2).
  10. Method of treating the circumferential surfaces of printing cylinders according to one of the preceding claims, wherein an alcoholic or aqueous solution, which contains inorganic nanoparticles modified by organic additives, is used as coating liquid.
  11. Method of treating the circumferential surfaces of printing cylinders according to claim 10, wherein the nanoparticles consist of oxides of the elements of the II to V principal and subsidiary groups or mixtures thereof, particularly silicon oxide, titanium oxide, aluminium oxide, zirconium oxide or mixtures thereof.
  12. Method of treating the circumferential surfaces of printing cylinders according to claim 10 or 11, wherein hydrolysis products of long-chain trialkoxysilanes R-Si(OR)3 and/or dialkoxysilanes R-Si(OR)2 are used as organic additives, wherein R contains 4 to 18 carbon atoms in alkyl, aralkyl or fluoralkyl groups.
  13. Method of treating the circumferential surfaces of printing cylinders according to claim 10 or 11, wherein polysiloxanes with end alkyl, aryl, hydroxyalkyl, epoxy or polyether groups are used as organic additives.
  14. Method of treating the circumferential surfaces of printing cylinders according to claim 11, wherein the nanoparticles consist of a silicon oxide / aluminium oxide compound, which is modified by fluoralkylsilanes or fluoralkyl-functionalised polysiloxanes.
  15. Method of treating the circumferential surfaces of printing cylinders according to one of the preceding claims, wherein the coating liquid contains a photo-initiator.
  16. Method of treating the circumferential surfaces of printing cylinders according to one of the preceding claims, wherein the rubber blanket cylinder (2) after transfer of the coating liquid to the printing cylinder is set away and coating liquid remaining on the rubber blanket cylinder (2) is removed.
EP20030009299 2002-06-21 2003-04-24 Method for treating the surface of impression cylinders Expired - Fee Related EP1375143B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2002127759 DE10227759A1 (en) 2002-06-21 2002-06-21 Process for treating the outer surface of printing cylinders
DE10227759 2002-06-21

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EP1375143A1 EP1375143A1 (en) 2004-01-02
EP1375143B1 true EP1375143B1 (en) 2008-02-27

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1802721A4 (en) * 2004-10-05 2007-12-26 Newsouth Innovations Pty Ltd Hydrophobic and lyophobic coating
DE102005027789A1 (en) * 2005-06-15 2006-12-21 Nano-X Gmbh Alkali-stable sol-gel coating
DE102006041219A1 (en) * 2006-09-02 2008-03-06 Koenig & Bauer Aktiengesellschaft Inline method for printing paper sheet, involves applying color rejected coating on printing lacquer-coating, delivering paper sheet to turnover device, turning paper sheet, and printing rear side of paper sheet

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3161130A (en) 1963-05-27 1964-12-15 Miller Printing Machinery Co Printing apparatus
US3686771A (en) 1970-07-23 1972-08-29 Polygraph Leipzig Humidity regulating system for printing machines
CH620863A5 (en) * 1977-06-24 1980-12-31 Von Roll Ag Metal foil with sheet-bearing surface
DE4320069A1 (en) 1993-06-17 1995-01-12 Roland Man Druckmasch Method and device for repairing cylinders of printing machines
DE19948311A1 (en) 1999-10-06 2001-04-12 Nanogate Gmbh Process for improving print quality and/or down time of printing machines comprises adjustment of surface energies of surfaces that come into contact with ink to single transition point
DE10115876A1 (en) 2000-04-27 2001-10-31 Heidelberger Druckmasch Ag Colour rejecting coating for an element that comes into contact with a printing material, consists of a material which rejects colour after being irradiated with light.

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DE10227759A1 (en) 2004-01-22
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