EP0858909B1 - Printing machine with a corrosion-resistant printing cylinder - Google Patents

Printing machine with a corrosion-resistant printing cylinder Download PDF

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Publication number
EP0858909B1
EP0858909B1 EP97119106A EP97119106A EP0858909B1 EP 0858909 B1 EP0858909 B1 EP 0858909B1 EP 97119106 A EP97119106 A EP 97119106A EP 97119106 A EP97119106 A EP 97119106A EP 0858909 B1 EP0858909 B1 EP 0858909B1
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EP
European Patent Office
Prior art keywords
cylinder
plastic
thickness
printing press
printing
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP97119106A
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German (de)
French (fr)
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EP0858909A2 (en
EP0858909A3 (en
Inventor
Frank Kropp
Joachim Sonnenschein
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Heidelberger Druckmaschinen AG
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Heidelberger Druckmaschinen AG
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Classifications

    • 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
    • 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
    • B41N10/00—Blankets or like coverings; Coverings for wipers for intaglio printing
    • 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
    • B41N2207/14—Location or type of the layers in shells for rollers of printing machines characterised by macromolecular organic compounds
    • 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
    • B41N2210/00—Location or type of the layers in multi-layer blankets or like coverings
    • B41N2210/02—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
    • B41N2210/00—Location or type of the layers in multi-layer blankets or like coverings
    • B41N2210/14—Location or type of the layers in multi-layer blankets or like coverings characterised by macromolecular organic compounds
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49544—Roller making
    • Y10T29/4956—Fabricating and shaping roller work contacting surface element
    • Y10T29/49563—Fabricating and shaping roller work contacting surface element with coating or casting about a core

Definitions

  • the printing unit cylinders used in today's printing presses especially the Blanket cylinder and the plate cylinder of roll or rotary Sheet-fed rotary offset presses are used to prevent corrosion of the Cylinder surface usually covered with protective layers.
  • easy Corrosion protection layers for cast iron or steel cylinders are made by phosphating and subsequent oiling of the cylinder jacket surface.
  • high-quality corrosion protection layers for printing unit cylinders by galvanic To produce galvanizing, nickel plating and chrome plating, such as that in the US-PS 4,643,095 is described, or such thin metal layers made of chromium, nickel etc. using a laser to melt onto the plate cylinder (DE 36 08 286).
  • Other metal layers e.g. Stainless steel, e.g. JP-OS 4-238034 teaches Plasma coatings applied to the printing cylinder in an argon atmosphere.
  • a dampening roller for the dampening unit is one Offset printing machine described, the hydrophilic between 50 microns and 150 microns thick Layer of a mixture of polyurethane and quartz powder. Apart from that it is not a pressure cylinder and an anti-corrosion layer, the surface of this dampening roller is ground after coating.
  • rollers in the inking or dampening unit are suitable Printing machine applied coatings from plastics such as polyamides (Rilsan) not particularly good as a corrosion protection layer because these layers on the Surface of the cylinder adhere poorly, so it can be shrunk on relatively thick and then require reworking of the cylinder surface.
  • plastics such as polyamides (Rilsan) not particularly good as a corrosion protection layer because these layers on the Surface of the cylinder adhere poorly, so it can be shrunk on relatively thick and then require reworking of the cylinder surface.
  • Shrink bandage is also only with completely closed cylinder surfaces possible.
  • this corrosion protection layer is produced by the Surface by turning, blasting etc. with a clean, micro-rough surface provided printing unit cylinder in a solvent or dispersant dissolved or dispersed thermally crosslinkable plastic such as Polyurethane, nitrile butadiene, phenol or epoxy resin, silicone resin, acrylic resin or acrylate is applied evenly thin on the cylinder surface, then the cylinder dried and then cured or crosslinked at elevated temperature, so that a abrasion-resistant, maximum 100 ⁇ m thick protective layer that adheres to the Cylinder surface is connected.
  • the cylinder provided with this layer then becomes assembled without further processing of the surface shape and in the printing press built-in. Because, for example, by spraying the plastic on the Have the cylinder surface produce very uniform layers Shape deviations of the cylinder surface are still within after coating the required tolerance range of typically 5 ⁇ m, so that a subsequent Post-processing can be dispensed with.
  • the cylinders designated 2 and 3 in the printing unit 1 of FIG. 1, namely the Plate cylinder 2 and the blanket cylinder 3 are made of cast iron or steel and were very precise in terms of the shape of their surface to a diameter with a Concentricity of 0.01mm brought. Before installing it in the press its surface was coated with an anti-corrosion layer in the following way Mistake:
  • the surface was cleaned by sandblasting with a defined grain size and roughened, resulting in a roughness depth of approx. 5 ⁇ m. Then was on the surface prepared in this way is a mixture of the main components nitrile butadiene (100 parts), phenolic resin (100 parts), carbon black (70 parts), vulcanizing agent (30 parts), Zinc oxide (5 parts), stearic acid (1 part), accelerator (1 part) and Hexamethyltetraamine (6 parts) dissolved as a 30% solution of a suitable organic Solvent at a temperature of around 60 degrees Celsius to around 50 Celsius sprayed on heated cylinder.
  • the cylinder 2 became uniform rotated and the spray head 4 at a constant speed over its surface performed as outlined in Figure 2 ..
  • the cylinder sprayed in this way was then at the temperature mentioned for several hours dried until the layer was solvent free. Then the temperature raised to 130 degrees and held constant for about 2 hours, which makes the shift polymerized.
  • an additional primer based on a Phenolic resin for example polybutirals in a very thin layer of approx. 10 ⁇ m spray on the cylinder surface.
  • the cylinder surface can also be phosphated before coating.
  • the through-hardened protective layer obtained in a thickness of 50 microns protects the Cylinder surface very effective against corrosion, is resistant to the at Offset printing used inks, detergents and solvents and relatively impact and abrationsfest.
  • e.g. B also one Lacquer layer based on a dissolved polyurethane compound essentially after be sprayed onto cylinder 2 using the same method.
  • suitable PU connections include in U.S. Patents 5,552,496 and 5,459,197 which is expressly referred to here.
  • Such a coating is also suitable for others because of its adhesive strength sheet-guiding printing unit cylinders that do not have a completely closed cylinder surface own, but with z. B. channels or recesses are provided, such as. B. Convicted drums.

Description

Die in den heutigen Druckmaschinen eingesetzten Druckwerkszylinder, insbesondere der Gummituchzylinder und der Plattenzylinder von Rollenrotations- oder Bogenrotations-Offsetdruckmaschinen werden zur Vermeidung von Korrosion der Zylinderoberfläche üblicherweise mit Schutzschichten überzogen. Einfache Korrosionsschutzschichten für Grauguß- oder Stahlzylinder werden durch Phosphatieren und nachfolgendes Einölen der Zylindermantelfläche erzeugt. Daneben ist es bekannt, hochwertige Korrosionsschutzschichten für Druckwerkszylinder durch galvanisches Verzinken, Vernickeln und Verchromen zu erzeugen, wie das beispielsweise in der US-PS 4,643,095 beschrieben ist, oder solche dünne Metallschichten aus Chrom, Nickel etc. mit Hilfe eines Lasers auf den Plattenzylinder aufzuschmelzen (DE 36 08 286). Andere Metallschichten, z.B. Edelstahl werden, wie z.B. die JP-OS 4-238034 lehrt, durch Plasmabeschichten in einer Argonatmosphäre auf den Druckzylinder aufgebracht.The printing unit cylinders used in today's printing presses, especially the Blanket cylinder and the plate cylinder of roll or rotary Sheet-fed rotary offset presses are used to prevent corrosion of the Cylinder surface usually covered with protective layers. easy Corrosion protection layers for cast iron or steel cylinders are made by phosphating and subsequent oiling of the cylinder jacket surface. It is also known high-quality corrosion protection layers for printing unit cylinders by galvanic To produce galvanizing, nickel plating and chrome plating, such as that in the US-PS 4,643,095 is described, or such thin metal layers made of chromium, nickel etc. using a laser to melt onto the plate cylinder (DE 36 08 286). Other metal layers, e.g. Stainless steel, e.g. JP-OS 4-238034 teaches Plasma coatings applied to the printing cylinder in an argon atmosphere.

Abgesehen davon, daß diese bekannten Verfahren relativ aufwendig und damit teuer sind, ist oft auch noch eine Nachbearbeitung der Zylindermantelfläche erforderlich, um sicherzustellen, daß die Formabweichungen des Zylinders nach dem Beschichten innerhalb der für die Zylinder vorgegebenen Toleranz von typisch 5µm bleiben.Apart from the fact that these known methods are relatively complex and therefore expensive, it is often also necessary to rework the surface of the cylinder in order to ensure that the shape deviations of the cylinder after coating remain within the tolerance of typically 5 µm specified for the cylinders.

Aus der EP 0 583 543 A1 sowie der US 4,643,095 ist es weiterhin bekannt, nicht den Platten- oder Gummituchzylinder, sondern den Gegendruckzylinder im Druckwerk einer Rotationsdruckmaschine mit einer allerdings relativ dicken, nämlich 0,4 bis 1 mm starken Kunststoffschicht aus Polyurethan zu versehen. Dabei geht es jedoch nicht darum, diesen Zylinder vor Korrosion zu schützen, sondern die nachgiebigen bzw. elastischen Eigenschaften einer solchen Schicht bei den dort beschriebenen direkten Druckverfahren auszunutzen, um das Abdruckverhalten zu optimieren. From EP 0 583 543 A1 and US 4,643,095 it is also known, not the Plate or blanket cylinder, but the impression cylinder in a printing unit Rotary printing machine with a relatively thick, namely 0.4 to 1 mm thick To provide a plastic layer made of polyurethane. However, this is not about this To protect cylinders from corrosion, but the compliant or elastic Properties of such a layer in the direct printing processes described there exploit to optimize the impression behavior.

In der JP-OS 61-79697 ist eine Feuchtwalze für das Feuchtwerk einer Offsetdruckmaschine beschrieben, die eine zwischen 50 µm und 150 µm dicke hydrophile Schicht aus einer Mixtur von Polyurethan und Quarzpulver trägt. Abgesehen davon, daß es sich hierbei nicht um einen Druckzylinder und eine Korrosionsschutzschicht handelt, wird die Oberfläche dieser Feuchtwalze nach dem Beschichten geschliffen.In JP-OS 61-79697 a dampening roller for the dampening unit is one Offset printing machine described, the hydrophilic between 50 microns and 150 microns thick Layer of a mixture of polyurethane and quartz powder. Apart from that it is not a pressure cylinder and an anti-corrosion layer, the surface of this dampening roller is ground after coating.

Generell eignen sich die bekannten, auf Walzen im Farb- oder Feuchtwerk von Druckmaschinen aufgebrachten Beschichtungen aus Kunststoffen wie Polyamiden (Rilsan) nicht sonderlich gut als Korrosionsschutzschicht, weil diese Schichten an der Oberfläche der Zylinder schlecht haften, deshalb relativ dick aufgeschrumpft werden und dann eine Nachbearbeitung der Zylinderoberfläche erfordern. Ein solcher Schrumpfverband ist außerdem nur bei vollständig geschlossenen Zylinderoberflächen möglich.In general, the well-known on rollers in the inking or dampening unit are suitable Printing machine applied coatings from plastics such as polyamides (Rilsan) not particularly good as a corrosion protection layer because these layers on the Surface of the cylinder adhere poorly, so it can be shrunk on relatively thick and then require reworking of the cylinder surface. Such a Shrink bandage is also only with completely closed cylinder surfaces possible.

Es ist die Aufgabe der vorliegenden Erfindung, ein möglichst einfaches und preiswertes Verfahren zum Aufbringen einer Korrosionsschutzschicht auf die Oberfläche von Zylindern im Druckwerk einer Druckmaschine anzugeben, sowie eine Druckmaschine mit derartig korrosionsgeschützten Druckzylindem zu schaffen.It is the object of the present invention to be as simple and inexpensive as possible Process for applying a corrosion protection layer to the surface of Specify cylinders in the printing unit of a printing press, and a printing press with to create such corrosion-protected printing cylinders.

Diese Aufgabe wird mit den in den Ansprüchen 1 bzw 9 angegebenen Maßnahmen gelöst.This object is achieved with the measures specified in claims 1 and 9, respectively solved.

Gemäß der Erfindung wird diese Korrosionsschutzschicht erzeugt, indem auf die Oberfläche des durch Drehen, Strahlen etc. mit einer sauberen, mikrorauhen Oberfläche versehenen Druckwerkszylinders ein in einem Lösungsmittel bzw. Dispersionsmittel gelöster bzw. dispergierter thermisch vernetzbarer Kunststoff wie beispielsweise Polyurethan, Nitrilbutadien, Phenol oder Epoxyharz, Silikonharz, Acrylharz oder Acrylat gleichmäßig dünn auf die Zylinderoberfläche aufgetragen wird, der Zylinder anschließend getrocknet und dann bei erhöhter Temperatur ausgehärtet bzw. vernetzt wird, so daß eine abrasionsfeste, höchstens 100 µm starke Schutzschicht entsteht, die haftend mit der Zylinderoberfläche verbunden ist. Der mit dieser Schicht versehene Zylinder wird dann ohne weitere Bearbeitung der Oberflächenform montiert und in die Druckmaschine eingebaut. Da sich beispielsweise durch Aufsprühen des Kunststoffes auf die Zylinderoberfläche sehr gleichmäßige Schichten erzeugen lassen, liegen die Formabweichungen der Zylinderoberfläche nach dem Beschichten immer noch innerhalb der geforderten Toleranzbreite von typisch 5 µm, so daß auf eine anschließende Nachbearbeitung verzichtet werden kann.According to the invention, this corrosion protection layer is produced by the Surface by turning, blasting etc. with a clean, micro-rough surface provided printing unit cylinder in a solvent or dispersant dissolved or dispersed thermally crosslinkable plastic such as Polyurethane, nitrile butadiene, phenol or epoxy resin, silicone resin, acrylic resin or acrylate is applied evenly thin on the cylinder surface, then the cylinder dried and then cured or crosslinked at elevated temperature, so that a abrasion-resistant, maximum 100 µm thick protective layer that adheres to the Cylinder surface is connected. The cylinder provided with this layer then becomes assembled without further processing of the surface shape and in the printing press built-in. Because, for example, by spraying the plastic on the Have the cylinder surface produce very uniform layers Shape deviations of the cylinder surface are still within after coating the required tolerance range of typically 5 µm, so that a subsequent Post-processing can be dispensed with.

Weitere Vorteile der vorliegenden Erfindung ergeben sich aus der nachfolgenden Beschreibung eines Ausführungsbeispiels anhand der Figuren 1 bis 2 der beigefügten Zeichnungen.

Figur 1
ist eine vereinfachte Prinzipskizze, die das Druckwerk einer Offsetdruckmaschine mit dem Plattenzylinder und dem Gummituchzylinder im Schnitt zeigt.
Figur 2
ist eine einfache Schemazeichnung, die den Beschichtungsvorgang des Zylinders 2 aus Figur 1 skizziert.
Further advantages of the present invention result from the following description of an exemplary embodiment with reference to FIGS. 1 to 2 of the accompanying drawings.
Figure 1
is a simplified schematic diagram that shows the printing unit of an offset printing machine with the plate cylinder and the blanket cylinder in section.
Figure 2
is a simple schematic drawing that outlines the coating process of the cylinder 2 of Figure 1.

Die im Druckwerk 1 der Figur 1 mit 2 und 3 bezeichneten Zylinder, nämlich der Plattenzylinder 2 und der Gummituchzylinder 3 bestehen aus Grauguß oder Stahl und wurden bzgl. der Form ihrer Oberfläche sehr genau auf einen Durchmesser mit einer Rundlaufgenauigkeit von 0,01mm gebracht. Vor ihrem Einbau in die Druckmaschine wurde ihre Oberfläche auf folgende Art und Weise mit einer Korrosionsschutzschicht versehen:The cylinders designated 2 and 3 in the printing unit 1 of FIG. 1, namely the Plate cylinder 2 and the blanket cylinder 3 are made of cast iron or steel and were very precise in terms of the shape of their surface to a diameter with a Concentricity of 0.01mm brought. Before installing it in the press its surface was coated with an anti-corrosion layer in the following way Mistake:

Zuerst wurde die Oberfläche durch Strahlen mit Sand mit definierter Körnung gesäubert und aufgerauht, wodurch sich eine Rauhtiefe von ca.5 µm ergab. Anschließend wurde auf die so vorbereitete Oberfläche eine Mischung aus den Hauptkomponenten Nitrilbutadien (100 Teile), Phenolharz (100 Teile), Ruß (70 Teile), Vulkanisationsmittel (30 Teile), Zinkoxid (5 Teile), Stearinsäure (1 Teil), Beschleuniger (1 Teil) und Hexamethyltetraamin (6 Teile) gelöst als 30%ige Lösung eines geeigneten organischen Lösungsmittels bei einer Temperatur von ungefähr 60 Grad Celsius auf den auf ca. 50 Grad Celsius erwärmten Zylinder aufgesprüht. Hierbei wurde der Zylinder 2 gleichförmig gedreht und der Sprühkopf 4 mit konstanter Geschwindigkeit über seine Oberfläche geführt, wie das in Figur 2 skizziert ist..First the surface was cleaned by sandblasting with a defined grain size and roughened, resulting in a roughness depth of approx. 5 µm. Then was on the surface prepared in this way is a mixture of the main components nitrile butadiene (100 parts), phenolic resin (100 parts), carbon black (70 parts), vulcanizing agent (30 parts), Zinc oxide (5 parts), stearic acid (1 part), accelerator (1 part) and Hexamethyltetraamine (6 parts) dissolved as a 30% solution of a suitable organic Solvent at a temperature of around 60 degrees Celsius to around 50 Celsius sprayed on heated cylinder. Here, the cylinder 2 became uniform rotated and the spray head 4 at a constant speed over its surface performed as outlined in Figure 2 ..

Der so besprühte Zylinder wurde dann bei der genannten Temperatur mehrere Stunden getrocknet, bis die Schicht lösungsmittel frei war. Anschließend wurde die Temperatur auf 130 Grad erhöht und über ca. 2 Stunden konstant gehalten, wodurch die Schicht polymerisierte.The cylinder sprayed in this way was then at the temperature mentioned for several hours dried until the layer was solvent free. Then the temperature raised to 130 degrees and held constant for about 2 hours, which makes the shift polymerized.

Auf diese Weise erhält man je nach Konzentration des gelösten Harzes und aufgesprühter Menge die gewünschte, ca. 50 µm starke Korrosionsschutzschicht, die sehr gut auf der Zylinderoberfläche haftet. Durch die Verfabrensführung lassen sich die Toleranzen für die Dickenvariation der Schicht von +/- 2,5 µm leicht einhalten, so daß der so beschichtete Zylinder ohne weitere Nachbearbeitung montiert und in die Druckmaschine eingebaut werden kann.In this way, depending on the concentration of the dissolved resin and sprayed on Quantity the desired, about 50 µm thick anti-corrosion layer, which very well on the Cylinder surface sticks. The tolerances for the Adhere to the thickness variation of the layer of +/- 2.5 µm slightly, so that the coated one Cylinder assembled without further post-processing and installed in the printing press can be.

Im Hinblick auf möglichst gute Haftung auf der Zylinderoberfläche hat es sich als sinnvoll erwiesen, vor der Beschichtung zusätzlich einen Primer auf der Basis eine Phenolharzes, zum Beispiel Polybutiralen in einer sehr dünnen Schicht von ca. 10 µm auf die Zylinderoberfläche aufzusprühen. Alternativ dazu kann die Zylinderoberfläche auch vor dem Beschichten phosphatiert werden.With regard to the best possible adhesion to the cylinder surface, it has proven to be proven sensible, an additional primer based on a Phenolic resin, for example polybutirals in a very thin layer of approx. 10 µm spray on the cylinder surface. Alternatively, the cylinder surface can also be phosphated before coating.

Die erhaltene durchgehärtete Schutzschicht in einer Stärke von 50 µm schützt die Zylinderoberfläche sehr effektiv gegen Korrosion, ist resistent gegen die beim Offsetdrucken verwendeten Farben, Wasch- und Lösungsmittel und relativ schlag- und abrationsfest. The through-hardened protective layer obtained in a thickness of 50 microns protects the Cylinder surface very effective against corrosion, is resistant to the at Offset printing used inks, detergents and solvents and relatively impact and abrationsfest.

Alternativ zu dem beschriebenen Ausführungsbeispiel kann aber z. B. auch eine Lackschicht auf der Basis einer gelösten Polyurethanverbindung im wesentlichen nach dem gleichen Verfahren auf den Zylinder 2 aufgesprüht werden. Geeignete PU-Verbindungen sind u.a. in den US-Patenten 5,552,496 und 5,459,197 beschrieben, auf die an dieser Stelle ausdrücklich Bezug genommen wird.As an alternative to the described embodiment, e.g. B. also one Lacquer layer based on a dissolved polyurethane compound essentially after be sprayed onto cylinder 2 using the same method. suitable PU connections include in U.S. Patents 5,552,496 and 5,459,197 which is expressly referred to here.

Eine derartige Beschichtung eignet sich wegen ihrer Haftfestigkeit auch für andere bogenführende Druckwerkszylinder, die keine völlig geschlossene Zylindermantelfläche besitzen, sondern mit z. B. Kanälen oder Ausnehmungen versehen sind, wie z. B. Überführtrommeln.Such a coating is also suitable for others because of its adhesive strength sheet-guiding printing unit cylinders that do not have a completely closed cylinder surface own, but with z. B. channels or recesses are provided, such as. B. Convicted drums.

Claims (11)

  1. Method of applying an anti-corrosion layer to the surface of a cylinder for a printing unit of a printing press, wherein
    the cylinder is provided with a clean, micro-rough surface by turning, blasting etc, a plastic dissolved in a solvent and thermally cross-linkable is uniformly sprayed onto the cylinder surface,
    the plastic layer is subsequently dried and cured and/or cross-linked at an elevated temperature, and wherein
    the cylinder is then installed without any further treatment of the surface form.
  2. Method according to claim 1,
    wherein the dissolved material is applied to the cylinder at an elevated temperature.
  3. Method according to claim 2,
    wherein the temperature of the cylinder is brought to between 40 and 80 degrees Celsius and the dissolved plastic is also applied in the temperature range between 40 degrees Celsius and 80 degrees Celsius.
  4. Method according to claim 1,
    wherein the plastic is cross-linked at temperatures above 120 degrees.
  5. Method according to claim 1,
    wherein the dissolved plastic is sprayed onto the cylinder surface.
  6. Method according to one of claims 1 to 5,
    wherein an adhesive primer is applied to the surface of the cylinder prior to the application of the plastic.
  7. Method according to one of claims 1 to 5,
    wherein the surface of the cylinder is phosphated prior to the application of the plastic.
  8. Method according to one of claims 1 to 7,
    wherein the plastic contains one of the materials polyurethane, phenolic resin, epoxy resin, polyester resin, silicone resin, acrylic resin, acrylate, nitrite butadiene, or a mixture of these materials.
  9. Printing press haying a printing unit cylinder the surface of which carries an anti-corrosion layer, wherein the anti-corrosion layer is at most 100 µm in thickness, consists of a wear-proof and abrasion-proof plastic that is thermally cross-linkable and adhesively bonded to the surface, and wherein the thickness of the layer does not vary by more than 20% of its thickness or 5 µm, whichever is greater.
  10. Printing press according to claim 9,
    wherein the anti-corrosion layer is applied with a thickness of up to 50 µm and with a thickness tolerance of 5 µm.
  11. Printing press according to one of claims 9 to 10,
    wherein the printing unit cylinder is the plate cylinder or blanket cylinder of an offset printing press.
EP97119106A 1997-02-14 1997-11-03 Printing machine with a corrosion-resistant printing cylinder Expired - Lifetime EP0858909B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19705671A DE19705671A1 (en) 1997-02-14 1997-02-14 Printing machine with a corrosion-protected printing unit cylinder
DE19705671 1997-02-14

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EP0858909A2 EP0858909A2 (en) 1998-08-19
EP0858909A3 EP0858909A3 (en) 1999-09-01
EP0858909B1 true EP0858909B1 (en) 2003-05-21

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US (1) US6006663A (en)
EP (1) EP0858909B1 (en)
JP (1) JPH10226183A (en)
DE (2) DE19705671A1 (en)

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DE59710124D1 (en) 2003-06-26
JPH10226183A (en) 1998-08-25
DE19705671A1 (en) 1998-08-20
EP0858909A2 (en) 1998-08-19
EP0858909A3 (en) 1999-09-01
US6006663A (en) 1999-12-28

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