EP3206876B1 - Printing sleeve and method for producing a printing sleeve - Google Patents

Printing sleeve and method for producing a printing sleeve Download PDF

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Publication number
EP3206876B1
EP3206876B1 EP15736426.6A EP15736426A EP3206876B1 EP 3206876 B1 EP3206876 B1 EP 3206876B1 EP 15736426 A EP15736426 A EP 15736426A EP 3206876 B1 EP3206876 B1 EP 3206876B1
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EP
European Patent Office
Prior art keywords
layer
outer side
arise
radially inward
printing
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German (de)
French (fr)
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EP3206876A1 (en
Inventor
Stefan Füllgraf
Armin SENNE
Jens LÖSCHNER
Torsten RASCHDORF
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ContiTech Elastomer Beschichtungen GmbH
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ContiTech Elastomer Beschichtungen GmbH
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Priority to SI201530479T priority Critical patent/SI3206876T1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00—Forme preparation
    • B41C1/18—Curved printing formes or printing cylinders
    • B41C1/182—Sleeves; Endless belts
    • 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
    • B41N1/00—Printing plates or foils; Materials therefor
    • B41N1/16—Curved printing plates, especially cylinders
    • B41N1/22—Curved printing plates, especially cylinders made of other substances
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00—Forme preparation
    • B41C1/18—Curved printing formes or printing cylinders
    • B41C1/186—Curved printing formes or printing cylinders by casting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F5/00—Rotary letterpress machines
    • B41F5/24—Rotary letterpress machines for flexographic printing

Definitions

  • the invention relates to a pressure sleeve according to the preamble of claim 1 and two methods for producing such a pressure sleeve according to claims 3 and 5.
  • flexographic printing, (printing) sleeves so-called sleeves, with a dimensionally stable reinforcement, the so-called base sleeve, are used as printing forms whose outwardly directed pressure surface consists of or comprises an elastomeric material, ie. is rubber coated.
  • These printing plates are used on printing cylinders to which they are pushed with radial expansion.
  • the dimensionally stable and radially difficult to expand pressure sleeves are widened from the inside by compressed air; For this they must be airtight. This radial expansion or widening allows pushing on the impression cylinder. After switching off the compressed air pulls the
  • a printing sleeve is constructed in three layers, namely from the inside to the outside with a base sleeve as a strength carrier, a compressible layer and a cover layer, which can act as a pressure layer; In this case, any adhesion promoters present between these layers are not considered as layers.
  • a base sleeve As a base sleeve, currently, e.g. GRP materials (glass fiber reinforced plastic) used.
  • the base sleeve serves to absorb torsional forces. Due to their design, in particular the inside of the base sleeve, the Gleitreibwert acting on the impression cylinder when pushed, can be adjusted or influenced.
  • a base sleeve elastomeric plates or mixtures are then applied, which may be either compressible or incompressible.
  • This compressible layer absorbs compressive forces, reduces vibrations and improves the area expression.
  • the compressible layer establishes the connection between the base sleeve and the cover layer.
  • the cover layer is engravable, e.g. Laserbar to map the object to be printed on this print layer can. It should ensure good color transfer and have the lowest possible swelling. All of these layers are seamlessly crafted to avoid imaging such a seam in the print image.
  • the US 6,703,095 B2 relates to a printing sleeve for a printing cylinder with a three-layer structure and a manufacturing method for producing such a sleeve.
  • the DE 10 2011 053 747 A1 describes a printing for use for high pressure, especially for flexographic printing.
  • the printing form can be formed in one layer by an extruded elastomeric printing layer.
  • the printing form can also be formed in a multi-layered manner by an outer extruded elastomeric printing layer, which on the inside has a reinforcement layer.
  • the printing plate may additionally have a compressible layer between the printing layer and the reinforcement layer in order to additionally achieve a compressible effect, ie to be able to additionally absorb pressures in the radial direction.
  • the DE 295 18 150 U1 describes a printing sleeve, in particular for a flexographic printing cylinder.
  • this pressure sleeve has a radially inner layer of fiber-reinforced plastic and a radially outer layer as a rubber layer.
  • the radially inner layer has due to the fiber-reinforced plastic as a material correspondingly high strength and rigidity.
  • An object of the present invention is therefore to provide a pressure sleeve of the type described above, which is simpler and / or more cost-effective with the same or better functionality and / or easier, cheaper and / or can be made faster.
  • the number of steps for producing such a pressure sleeve and the resulting costs should be reduced.
  • the invention relates to a pressure sleeve according to the preamble of claim 1 or claim 2.
  • This pressure sleeve is characterized by the features of the characterizing part of claim 1 or 2.
  • the first, radially inner layer comprises a (glass) fiber-reinforced compressible mixture, such that the (glass) fibers in the circumferential direction and / or longitudinal forces and the compressible mixing elements in the radial direction can absorb occurring pressures.
  • the materials that previously act separately in the base sleeve and compressible layer are combined together in a layer in which they can each perform their function. They thus compensate for the disadvantages or weaknesses of the other material, so that according to the invention, the functions of the base sleeve and the compressible layer can be used in a common layer.
  • the first, radially inner layer comprises a fleece and / or an open-pored fabric and / or a lattice structure which comprises a compressible rubber compound, so that the fleece and / or the open-pore Tissue and / or the lattice structure, the forces occurring in the circumferential direction and or or in the longitudinal direction and the compressible rubber compound can absorb the pressures occurring in the radial direction.
  • previously separate materials or layers are combined in a common layer.
  • the first, inner layer may be an incompressible layer made in the basically same manner as described above, but provided with an incompressible rubber compound instead of a compressible rubber compound. In this way, an incompressible compression sleeve with two layers can be produced.
  • the rubber compound of the compressible or incompressible first inner layer can make a better connection with the printing layer than conventional base sleeves or compressible layers, because the pressure layer has an elastomeric material and two rubber compounds in direct contact come together.
  • Both the first and second mixtures are preferably an elastomeric mixture, i. a rubber compound.
  • the application of the first (glass) fiber-reinforced compressible mixture to the cylinder takes place by means of a calendering process so that the fibers are aligned by the calendering process.
  • the implementation of this manufacturing step by means of a calender is advantageous because in a simple manner a corresponding orientation of the fibers in the material can be achieved so that they can absorb forces occurring in the finished printing sleeve in the circumferential direction and or or in the longitudinal direction.
  • Both the first and second mixtures are preferably an elastomeric mixture, i. a rubber compound.
  • Fig. 1 a schematic sectional view of a printing sleeve according to the invention.
  • Fig. 1 shows a schematic sectional view of a pressure sleeve according to the invention 1.
  • This illustration shows a cross section through a pressure sleeve 1, which extends cylindrically in the direction of its longitudinal axis L.
  • the pressure sleeve 1 has a first, radially inner layer 11, which is designed to be seamless in the circumferential direction U.
  • the pressure sleeve 1 is mounted with its first, radially inner layer 11 on a printing cylinder 10. For this purpose, it was radially expanded with compressed air from inside. In this case, the pressure sleeve 1 is frictionally engaged with the inner surface 11a of the first, radially inner layer 11 on the outer surface of the printing cylinder 10.
  • the pressure sleeve 1 also has a second, radially outer layer 12, which abuts with its inner surface 12a directly on the outer surface 11b of the first, radially inner layer 11.
  • the outer surface 12b of the second, radially outer layer 12 is formed as a pressure surface.
  • the first radially inner layer 11 is designed, for example, as a fiber-reinforced compressible mixture or as a nonwoven-reinforced compressible mixture such that it can perform both the function of a conventional base sleeve and simultaneously that of a compressible layer. In this way, the functions and modes of action of these two layers are united in a common layer according to the invention, which simplifies and reduces the construction of the pressure sleeve according to the invention compared to known pressure sleeves.

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  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)

Description

Die Erfindung betrifft eine Druckhülse gemäß dem Oberbegriff des Anspruchs 1 sowie zwei Verfahren zur Herstellung einer derartigen Druckhülse gemäß der Ansprüche 3 und 5.The invention relates to a pressure sleeve according to the preamble of claim 1 and two methods for producing such a pressure sleeve according to claims 3 and 5.

Im Flexodruck werden als Druckformen (Druck-)Hülsen, sog. Sleeves, mit einem formstabilen Festigkeitsträger, der sog. Basishülse, eingesetzt, deren nach außen gerichtete Druckoberfläche aus einem elastomeren Material besteht bzw. ein solches aufweist, d.h. gummibeschichtet ist. Diese Druckformen werden auf Druckzylindern verwendet, auf die sie unter radialer Aufweitung aufgeschoben werden. Hierzu werden die formstabilen und radial schwer dehnbaren Druckhülsen von Innen durch Druckluft aufgeweitet; hierzu müssen diese luftdicht sein. Diese radiale Dehnung oder Aufweitung ermöglicht das Aufschieben auf den Druckzylinder. Nach Abschalten der Druckluft zieht sich dieIn flexographic printing, (printing) sleeves, so-called sleeves, with a dimensionally stable reinforcement, the so-called base sleeve, are used as printing forms whose outwardly directed pressure surface consists of or comprises an elastomeric material, ie. is rubber coated. These printing plates are used on printing cylinders to which they are pushed with radial expansion. For this purpose, the dimensionally stable and radially difficult to expand pressure sleeves are widened from the inside by compressed air; For this they must be airtight. This radial expansion or widening allows pushing on the impression cylinder. After switching off the compressed air pulls the

Druckhülse wieder in ihre Ausgangslage zurück, d.h. nimmt wieder ihren eigentlichen Durchmesser an. Hierdurch wird ein fester Sitz der Druckhülse auf dem Druckzylinder erreicht, dessen Außendurchmesser zumindest geringfügig größer ist als der Innendurchmesser der Basishülse der Druckhülse in zusammengezogenen, d.h. nichtgeweiteten, Zustand.Pressure sleeve back to its original position, i. returns to its actual diameter. As a result, a tight fit of the pressure sleeve is achieved on the printing cylinder whose outer diameter is at least slightly larger than the inner diameter of the base sleeve of the pressure sleeve in a contracted, i. non-expanded, condition.

Üblicherweise ist eine Druckhülse in drei Schichten aufgebaut, nämlich von innen nach außen mit einer Basishülse als Festigkeitsträger, einer kompressiblen Schicht und einer Deckschicht, die als Druckschicht wirken kann; hierbei sind eventuell vorhandene Haftvermittler zwischen diesen Schichten nicht als Schichten berücksichtigt.Usually, a printing sleeve is constructed in three layers, namely from the inside to the outside with a base sleeve as a strength carrier, a compressible layer and a cover layer, which can act as a pressure layer; In this case, any adhesion promoters present between these layers are not considered as layers.

Als Basishülse werden derzeit z.B. GFK-Materialien (Glasfaserverstärkter Kunststoff) verwendet. Die Basishülse dient der Aufnahme von Torsionskräften. Durch ihre Ausgestaltung, insbesondere der Innenseite der Basishülse, kann der Gleitreibwert, der beim Aufschieben auf den Druckzylinder wirkt, eingestellt bzw. beeinflusst werden.As a base sleeve, currently, e.g. GRP materials (glass fiber reinforced plastic) used. The base sleeve serves to absorb torsional forces. Due to their design, in particular the inside of the base sleeve, the Gleitreibwert acting on the impression cylinder when pushed, can be adjusted or influenced.

Auf eine derartige Basishülse werden dann Elastomerplatten oder -mischungen aufgetragen, die entweder kompressibel oder inkompressibel sein können. Diese kompressible Schicht dient der Aufnahme von Druckkräften, der Reduzierung von Schwingungen und der Verbesserung des Flächenausdrucks. Die kompressible Schicht stellt die Verbindung zwischen der Basishülse und der Deckschicht her.On such a base sleeve elastomeric plates or mixtures are then applied, which may be either compressible or incompressible. This compressible layer absorbs compressive forces, reduces vibrations and improves the area expression. The compressible layer establishes the connection between the base sleeve and the cover layer.

Die Deckschicht ist gravierbar, z.B. laserbar, um das zu druckende Objekt auf dieser Druckschicht abbilden zu können. Sie soll eine gute Farbübertragung gewährleisten und eine möglichst geringe Quellung aufweisen. Alle diese Schichten werden nahtlos gefertigt, um eine Abbildung einer solchen Naht im Druckbild zu vermeiden.The cover layer is engravable, e.g. Laserbar to map the object to be printed on this print layer can. It should ensure good color transfer and have the lowest possible swelling. All of these layers are seamlessly crafted to avoid imaging such a seam in the print image.

Eine derartige dreischichtige oder dreilagige Druckhülse wird derzeit beispielsweise wie folgt hergestellt:

  • In einem ersten Arbeitsschritt wird die Basishülse erzeugt, indem z.B. ein Vlies mit z.B. Epoxidharz getränkt, um einen Zylinder gewickelt und darauf durch einen Heizvorgang mit entsprechendem Druck ausgehärtet wird. Üblicherweise wird die ausgeheizte Basishülse dann in einem weiteren Schritt übergeschliffen.
  • Auf die fertige Basishülse wird dann die kompressible oder inkompressible Schicht als z.B. Rohgummiplatte aufgebracht, aufgeheizt und anschließend geschliffen. Üblich ist auch die Verwendung eines Haftvermittlers zwischen diesen beiden Schichten, um deren Anbindung aneinander zu ermöglichen bzw. zu verstärken.
  • Auf die kompressible bzw. inkompressible Schicht wird dann die elastomere Deckschicht als Druckschicht aufgebracht.
Such a three-layer or three-layer printing sleeve is currently produced, for example, as follows:
  • In a first step, the base sleeve is produced by, for example, a nonwoven soaked with epoxy resin, for example, wound around a cylinder and cured by a heating process with appropriate pressure. Usually, the heated base sleeve is then over-ground in a further step.
  • On the finished base sleeve then the compressible or incompressible layer is applied as a raw rubber plate, heated and then ground. It is also common to use an adhesion promoter between these two layers in order to enable or enhance their connection to each other.
  • The elastomeric cover layer is then applied as a pressure layer to the compressible or incompressible layer.

Die US 6,703,095 B2 betrifft eine Druckhülse für einen Druckzylinder mit einem dreischichtigen Aufbau sowie einem Herstellungsverfahren zur Erzeugung eines derartigen Sleeves.The US 6,703,095 B2 relates to a printing sleeve for a printing cylinder with a three-layer structure and a manufacturing method for producing such a sleeve.

Nachteilig ist bei den üblichen Druckhülsen in bzw. bei deren Herstellung, dass diese verschiedene Schichten aufweisen, die jeweils im Wesentlichen eine Funktion bei der fertigen Druckhülse übernehmen, und für die verschiedenen Schichten auch entsprechend viele verschiedene Herstellungsschritte erforderlich sind. Dies führt zu Aufwand und Kosten.A disadvantage of the usual printing sleeves in or during their production that they have different layers, each of which essentially assumes a function in the finished printing sleeve, and for the different layers also correspondingly many different manufacturing steps are required. This leads to effort and costs.

Die DE 10 2011 053 747 A1 beschreibt eine Druckform zur Verwendung für den Hochdruck, insbesondere für den Flexodruck. Die Druckform kann einschichtig durch eine extrudierte elastomere Druckschicht ausgebildet sein. Die Druckform kann jedoch auch mehrschichtig durch eine äußere extrudierte elastomere Druckschicht ausgebildet sein, welche innenseitig eine Festigkeitsträgerschicht aufweist. Die Druckform kann zusätzlich zwischen der Druckschicht und der Festigkeitsträgerschicht eine kompressible Schicht aufweisen, um zusätzlich eine kompressible Wirkung zu erreichen, d.h. um zusätzlich Drücke in radialer Richtung aufnehmen zu können.The DE 10 2011 053 747 A1 describes a printing for use for high pressure, especially for flexographic printing. The printing form can be formed in one layer by an extruded elastomeric printing layer. However, the printing form can also be formed in a multi-layered manner by an outer extruded elastomeric printing layer, which on the inside has a reinforcement layer. The printing plate may additionally have a compressible layer between the printing layer and the reinforcement layer in order to additionally achieve a compressible effect, ie to be able to additionally absorb pressures in the radial direction.

Die DE 295 18 150 U1 beschreibt eine Druckhülse, insbesondere für einen Flexodruckzylinder. In einer zweischichtigen Ausführungsform weist diese Druckhülse eine radial innere Lage aus faserverstärktem Kunststoff und eine radial äußere Lage als Gummischicht auf. Die radial innere Lage besitzt aufgrund des faserverstärkten Kunststoffs als Material eine entsprechend hohe Festigkeit und Starrheit.The DE 295 18 150 U1 describes a printing sleeve, in particular for a flexographic printing cylinder. In a two-layered embodiment, this pressure sleeve has a radially inner layer of fiber-reinforced plastic and a radially outer layer as a rubber layer. The radially inner layer has due to the fiber-reinforced plastic as a material correspondingly high strength and rigidity.

Eine Aufgabe der vorliegenden Erfindung ist es daher, eine Druckhülse der eingangs beschriebenen Art bereit zu stellen, welche bei gleicher oder besserer Funktionalität einfacher und bzw. oder kostengünstiger aufgebaut ist und bzw. oder einfacher, kostengünstiger und bzw. oder schneller hergestellt werden kann. Insbesondere soll die Anzahl der Arbeitsschritte zur Herstellung einer derartigen Druckhülse sowie die hierdurch entstehenden Kosten reduziert werden.An object of the present invention is therefore to provide a pressure sleeve of the type described above, which is simpler and / or more cost-effective with the same or better functionality and / or easier, cheaper and / or can be made faster. In particular, the number of steps for producing such a pressure sleeve and the resulting costs should be reduced.

Die Aufgabe wird erfindungsgemäß durch eine Druckhülse mit den Merkmalen gemäß Anspruch 1 oder Anspruch 2 sowie durch ein Verfahren zur Herstellung einer Druckhülse mit den Schritten gemäß Anspruch 3 bzw. 5 gelöst. Vorteilhafte Weiterbildungen sind in den Unteransprüchen beschrieben.The object is achieved by a printing sleeve with the features of claim 1 or claim 2 and by a method for producing a printing sleeve with the steps according to claim 3 or 5. Advantageous developments are described in the subclaims.

Somit betrifft die Erfindung eine Druckhülse gemäß des Oberbegriffs des Anspruchs 1 oder des Anspruchs 2. Diese Druckhülse ist durch die Merkmale des kennzeichnenden Teils von Anspruch 1 oder 2 gekennzeichnet.Thus, the invention relates to a pressure sleeve according to the preamble of claim 1 or claim 2. This pressure sleeve is characterized by the features of the characterizing part of claim 1 or 2.

Auf diese Weise können die Eigenschaften bzw. Funktionen, die bisher bei bekannten Druckhülsen auf die Basishülse und die kompressible Schicht separat aufgeteilt waren, durch eine gemeinsame Schicht übernommen werden. Hierdurch wird der Aufbau und die Herstellung einer erfindungsgemäßen Druckhülse von bisher drei Schichten auf nur noch zwei Schichten vereinfacht und vergünstigt. Auch kann die Dicke der Druckhülse in radialer Richtung reduziert werden.In this way, the properties or functions that were previously split separately in known compression sleeves on the base sleeve and the compressible layer, be taken over by a common layer. As a result, the structure and the production of a printing sleeve according to the invention of previously three layers is simplified and reduced to only two layers. Also, the thickness of the pressure sleeve can be reduced in the radial direction.

Gemäß einem Aspekt der vorliegenden Erfindung weist die erste, radial innere Schicht eine (glas-)faserverstärkte kompressible Mischung aufweist, so dass die (Glas-)Fasern die in Umfangsrichtung und bzw. oder in Längsrichtung auftretenden Kräfte und die kompressiblen Mischungselemente die in radialer Richtung auftretenden Drücke aufnehmen können. Auf diese Weise werden die Materialien, die bisher getrennt in der Basishülse und kompressiblen Schicht wirken, gemeinsamen in einer Schicht kombiniert, in der sie jeweils ihrer Funktion nachgehen können. Sie gleichen somit die Nachteile bzw. Schwächen des jeweils anderen Materials aus, so dass erfindungsgemäß die Funktionen der Basishülse und der kompressiblen Schicht in einer gemeinsamen Schicht genutzt werden können.According to one aspect of the present invention, the first, radially inner layer comprises a (glass) fiber-reinforced compressible mixture, such that the (glass) fibers in the circumferential direction and / or longitudinal forces and the compressible mixing elements in the radial direction can absorb occurring pressures. In this way, the materials that previously act separately in the base sleeve and compressible layer are combined together in a layer in which they can each perform their function. They thus compensate for the disadvantages or weaknesses of the other material, so that according to the invention, the functions of the base sleeve and the compressible layer can be used in a common layer.

Gemäß einem weiteren Aspekt der vorliegenden Erfindung weist die erste, radial innere Schicht ein Vlies und bzw. oder ein offenporiges Gewebe und bzw. oder eine Gitterstruktur auf, welche(s) eine kompressible Gummimischung aufweist, so dass das Vlies und bzw. oder das offenporige Gewebe und bzw. oder die Gitterstruktur die in Umfangsrichtung und bzw. oder in Längsrichtung auftretenden Kräfte und die kompressible Gummimischung die in radialer Richtung auftretenden Drücke aufnehmen können. Auch in dieser Ausführungsvariante werden bisher getrennte Materialien bzw. Schichten in einer gemeinsamen Schicht kombiniert.According to a further aspect of the present invention, the first, radially inner layer comprises a fleece and / or an open-pored fabric and / or a lattice structure which comprises a compressible rubber compound, so that the fleece and / or the open-pore Tissue and / or the lattice structure, the forces occurring in the circumferential direction and or or in the longitudinal direction and the compressible rubber compound can absorb the pressures occurring in the radial direction. Also in this embodiment, previously separate materials or layers are combined in a common layer.

Von der vorliegenden Erfindung ist auch umfasst, dass die erste, innere Schicht eine inkompressible Schicht sein kann, welche auf die grundsätzlich gleiche Art und Weise wie zuvor beschrieben hergestellt jedoch statt mit einer kompressiblen Gummimischung mit einer inkompressiblen Gummimischung versehen wird. Auf diese Weise kann auch eine inkompressible Drückhülse mit zwei Schichten hergestellt werden.It is also contemplated by the present invention that the first, inner layer may be an incompressible layer made in the basically same manner as described above, but provided with an incompressible rubber compound instead of a compressible rubber compound. In this way, an incompressible compression sleeve with two layers can be produced.

Vorteilhaft ist in allen Fällen, dass die Gummimischung der kompressiblen bzw. inkompressiblen ersten, inneren Schicht eine bessere Anbindung mit der Druckschicht eingehen kann als bei üblichen Basishülsen bzw. kompressiblen Schichten, weil auch die Druckschicht ein elastomeres Material aufweist und sich zwei Gummimischungen in direkten Kontakt miteinander kommen.It is advantageous in all cases that the rubber compound of the compressible or incompressible first inner layer can make a better connection with the printing layer than conventional base sleeves or compressible layers, because the pressure layer has an elastomeric material and two rubber compounds in direct contact come together.

Die vorliegende Erfindung betrifft auch ein Verfahren zur Herstellung einer Druckhülse wie zuvor beschrieben mit den Schritten:

  • Aufbringen einer ersten (glas-)faserverstärkten kompressiblen Mischung auf einen Zylinder,
  • Ausformen der ersten Mischung auf dem Zylinder zu einer ersten, radial inneren Schicht, die sowohl in Umfangsrichtung und bzw. oder in Längsrichtung auftretende Kräfte als auch in radialer Richtung auftretende Drücke aufnehmen kann,
  • Aufbringen einer zweiten Mischung auf die Außenseite der ersten, radial inneren Schicht, und
  • Ausformen der zweiten Mischung auf der Außenseite der ersten, radial inneren Schicht zu einer zweiten, radial äußeren Schicht, dessen Außenseite als Druckoberfläche ausgebildet ist.
The present invention also relates to a method for producing a printing sleeve as described above with the steps:
  • Applying a first (glass) fiber-reinforced compressible mixture to a cylinder,
  • Forming the first mixture on the cylinder into a first, radially inner layer which can absorb forces occurring in the circumferential direction and / or in the longitudinal direction as well as in the radial direction occurring pressures,
  • Applying a second mixture to the outside of the first radially inner layer, and
  • Forming the second mixture on the outside of the first, radially inner layer to a second, radially outer layer whose outer side is formed as a pressure surface.

Mittels eines derartigen Verfahrens kann eine erfindungsgemäße Druckhülse hergestellt werden, welche die zuvor beschriebenen Vorteile aufweist. Sowohl die erste als auch die zweite Mischung ist vorzugsweise eine elastomere Mischung, d.h. eine Gummimischung.By means of such a method, a pressure sleeve according to the invention can be produced, which has the advantages described above. Both the first and second mixtures are preferably an elastomeric mixture, i. a rubber compound.

Gemäß einem weiteren Aspekt der vorliegenden Erfindung erfolgt das Aufbringen der ersten (glas-)faserverstärkten kompressiblen Mischung auf den Zylinder mittels eines Kalanderprozesses, so dass die Fasern durch den Kalanderprozess ausgerichtet werden. Die Umsetzung dieses Fertigungsschrittes mittels eines Kalanders ist vorteilhaft, weil auf einfache Art und Weise eine entsprechende Ausrichtung der Fasern in dem Material erreicht werden kann, so dass diese in der fertigen Druckhülse in Umfangsrichtung und bzw. oder in Längsrichtung auftretende Kräfte aufnehmen können.According to a further aspect of the present invention, the application of the first (glass) fiber-reinforced compressible mixture to the cylinder takes place by means of a calendering process so that the fibers are aligned by the calendering process. The implementation of this manufacturing step by means of a calender is advantageous because in a simple manner a corresponding orientation of the fibers in the material can be achieved so that they can absorb forces occurring in the finished printing sleeve in the circumferential direction and or or in the longitudinal direction.

Die vorliegende Erfindung betrifft auch ein Verfahren mit den Schritten:

  • Aufbringen eines Vlieses und/oder eines offenporigen Gewebes und/oder einer Gitterstruktur auf einen Zylinder,
  • Einbringen einer kompressiblen Gummimischung in das Vlies und bzw. oder in das offenporige Gewebe und bzw. oder in die Gitterstruktur zur Ausbildung einer ersten, radial inneren Schicht, die sowohl in Umfangsrichtung und bzw. oder in Längsrichtung auftretende Kräfte als auch in radialer Richtung auftretende Drücke aufnehmen kann,
  • Aufbringen einer zweiten Mischung auf die Außenseite der ersten, radial inneren Schicht, und
  • Ausformen der zweiten Mischung auf der Außenseite der ersten, radial inneren Schicht zu einer zweiten, radial äußeren Schicht, dessen Außenseite als Druckoberfläche ausgebildet ist.
The present invention also relates to a method comprising the steps of:
  • Applying a fleece and / or an open-pored fabric and / or a lattice structure to a cylinder,
  • Introducing a compressible rubber mixture into the fleece and / or into the open-pored tissue and / or into the lattice structure to form a first, radially inner layer, the forces which occur both in the circumferential direction and / or in the longitudinal direction and also in the radial direction can record
  • Applying a second mixture to the outside of the first radially inner layer, and
  • Forming the second mixture on the outside of the first, radially inner layer to a second, radially outer layer whose outer side is formed as a pressure surface.

Auch mittels eines derartigen Verfahrens kann eine erfindungsgemäße Druckhülse hergestellt werden, welche die zuvor beschriebenen Vorteile aufweist. Sowohl die erste als auch die zweite Mischung ist vorzugsweise eine elastomere Mischung, d.h. eine Gummimischung.Also by means of such a method, a pressure sleeve according to the invention can be produced, which has the advantages described above. Both the first and second mixtures are preferably an elastomeric mixture, i. a rubber compound.

Ein Ausführungsbeispiel und weitere Vorteile der Erfindung werden nachstehend im Zusammenhang mit den folgenden Figuren erläutert. Darin zeigt:
Fig. 1 eine schematische Schnittdarstellung einer erfindungsgemäßen Druckhülse.An embodiment and further advantages of the invention are explained below in connection with the following figures. It shows:
Fig. 1 a schematic sectional view of a printing sleeve according to the invention.

Fig. 1 zeigt eine schematische Schnittdarstellung einer erfindungsgemäßen Druckhülse 1. Diese Darstellung zeigt einen Querschnitt durch eine Druckhülse 1, welche sich zylindrisch in Richtung ihrer Längsachse L erstreckt. Die Druckhülse 1 weist eine erste, radial innere Schicht 11 auf, welche in Umfangsrichtung U nahtlos geschlossen ausgebildet ist. Fig. 1 shows a schematic sectional view of a pressure sleeve according to the invention 1. This illustration shows a cross section through a pressure sleeve 1, which extends cylindrically in the direction of its longitudinal axis L. The pressure sleeve 1 has a first, radially inner layer 11, which is designed to be seamless in the circumferential direction U.

Die Druckhülse 1 ist mit ihrer ersten, radial inneren Schicht 11 auf einen Druckzylinder 10 aufgezogen. Hierzu wurde sie mit Druckluft von Innen radial geweitet. Hierbei liegt die Druckhülse 1 mit der Innenoberfläche 11a der ersten, radial inneren Schicht 11 auf der Außenoberfläche des Druckzylinders 10 kraftschlüssig auf. Die Druckhülse 1 weist ferner eine zweite, radial äußeren Schicht 12 auf, welche mit ihrer Innenoberfläche 12a direkt an der Außenoberfläche 11b der ersten, radial inneren Schicht 11 anliegt. Die Außenoberfläche 12b der zweiten, radial äußeren Schicht 12 ist als Druckoberfläche ausgebildet.The pressure sleeve 1 is mounted with its first, radially inner layer 11 on a printing cylinder 10. For this purpose, it was radially expanded with compressed air from inside. In this case, the pressure sleeve 1 is frictionally engaged with the inner surface 11a of the first, radially inner layer 11 on the outer surface of the printing cylinder 10. The pressure sleeve 1 also has a second, radially outer layer 12, which abuts with its inner surface 12a directly on the outer surface 11b of the first, radially inner layer 11. The outer surface 12b of the second, radially outer layer 12 is formed as a pressure surface.

Die erste radial innere Schicht 11 ist z.B. als faserverstärkte kompressible Mischung oder als vliesverstärkte kompressible Mischung derart ausgebildet, dass sie sowohl die Funktion einer herkömmlichen Basishülse als auch gleichzeitig die einer kompressiblen Schicht übernehmen kann. Auf diese Weise werden erfindungsgemäß die Funktionen und Wirkungsweisen dieser beiden Schichten in einer gemeinsamen Schicht vereint, was den Aufbau der erfindungsgemäßen Druckhülse gegenüber bekannten Druckhülsen vereinfacht und vergünstigt.The first radially inner layer 11 is designed, for example, as a fiber-reinforced compressible mixture or as a nonwoven-reinforced compressible mixture such that it can perform both the function of a conventional base sleeve and simultaneously that of a compressible layer. In this way, the functions and modes of action of these two layers are united in a common layer according to the invention, which simplifies and reduces the construction of the pressure sleeve according to the invention compared to known pressure sleeves.

BezugszeichenlisteLIST OF REFERENCE NUMBERS (Teil der Beschreibung)(Part of the description)

LL
Längsrichtunglongitudinal direction
RR
radiale Richtung, Radius, senkrecht zur Längsrichtung Lradial direction, radius, perpendicular to the longitudinal direction L
UU
Umfangsrichtungcircumferentially
11
Druckhülse, Hülse, SleevePressure sleeve, sleeve, sleeve
1010
Druckzylinderpressure cylinder
1111
erste, radial innere Schicht bzw. Lage der Druckhülse 1first, radially inner layer or position of the pressure sleeve 1
11a11a
Innenoberfläche bzw. Innenseite der ersten, inneren Schicht 11Inner surface or inner side of the first inner layer 11
11b11b
Außenoberfläche bzw. Außenseite der ersten, inneren Schicht 11Outer surface or outside of the first, inner layer 11th
1212
zweite, radial äußere Schicht bzw. Lage der Druckhülse 1second, radially outer layer or position of the pressure sleeve. 1
12a12a
Innenoberfläche bzw. Innenseite der zweiten, äußeren Schicht 11Inner surface or inner side of the second outer layer 11
12b12b
Außenoberfläche bzw. Außenseite der zweiten , äußeren Schicht 11Outer surface or outside of the second, outer layer 11th

Claims (5)

  1. Printing sleeve (1) having
    a first and radially inward layer (11) having
    a n inner side (11a) for directly contacting the outer side of a printing cylinder (10), and
    a n outer side (11b) which is radially opposite the inner side (11a), and
    a second and radially outward layer (12) having
    an outer side (12b) for configuring a printing surface, and
    an inner side (12a) which is radially opposite the outer side (12b),
    wherein the outer side (11b) of the first and radially inward layer (11) and the inner side (12a) of the second and radially outward layer (12) bear directly on one another, and wherein the first and radially inward layer (11) is configured to be able to absorb both forces that arise in the circumferential direction (U) and/or in the longitudinal direction (L) as well as pressures that arise in the radial direction (R),
    characterized in that
    the first and radially inward layer (11) has a (glass) fiber reinforced compressible compound such that the (glass) fibers may absorb the forces that arise in the circumferential direction (U) and/or in the longitudinal direction, and the compressible compound elements may absorb the pressures that arise in the radial direction (R).
  2. Printing sleeve (1) having a first and radially inward layer (11) having
    an inner side (11a) for directly contacting the outer side of a printing cylinder (10), and
    an outer side (11b) which is radially opposite the inner side (11a), and
    a second and radially outward layer (12) having
    an outer side (12b) for configuring a printing surface, and
    an inner side (12a) which is radially opposite the outer side (12b),
    wherein the outer side (11b) of the first and radially inward layer (11) and the inner side (12a) of the second and radially outward layer (12) bear directly on one another, and wherein the first and radially inward layer (11) is configured to be able to absorb both forces that arise in the circumferential direction (U) and/or in the longitudinal direction (L) as well as pressures that arise in the radial direction (R),
    characterized in that
    the first and radially inward layer (11) has a non-woven and/or an open-pore woven fabric and/or a mesh structure which have/has a compressible rubber compound such that the non-woven and/or the open-pore woven fabric and/or the mesh structure may absorb the forces that arise in the circumferential direction (U) and/or in the longitudinal direction (L), and the compressible rubber compound may absorb the pressures that arise in the radial direction (R).
  3. Method for producing a printing sleeve (1) according to Claim 1, said method comprising the following steps:
    applying a first (glass) fiber reinforced compressible compound onto a cylinder,
    molding the first compound on the cylinder, so as to form a first and radially inward layer (11) which may absorb both forces that arise in the circumferential direction (U) and/or in the longitudinal direction (L) as well as pressures that arise in the radial direction (R),
    applying a second compound to the outer side (11b) of the first and radially inward layer (11), and
    molding the second compound on the outer side (11b) of the first and radially inward layer (11), so as to form a second and radially outward layer (12), the outer side (12b) thereof being configured as a printing surface.
  4. Method according to Claim 3,
    wherein the application of the first (glass) fiber reinforced compressible compound onto the cylinder is performed by means of a calendering process such that the fibers are oriented by way of the calendering process.
  5. Method for producing a printing sleeve (1) according to Claim 2, said method comprising the following steps:
    applying a non-woven and/or an open-pore woven fabric and/or a mesh structure onto a cylinder,
    incorporating a compressible rubber compound into the non-woven and/or into the open-pore woven fabric and/or into the mesh structure, so as to configure a first and radially inward layer (11) which may absorb both forces that arise in the circumferential direction (U) and/or in the longitudinal direction (L) as well as pressures that arise in the radial direction (R),
    applying a second compound to the outer side (11b) of the first and radially inward layer (11), and
    molding the second compound on the outer side (11b) of the first and radially inward layer (11), so as to form a second and radially outward layer (12), the outer side (12b) thereof being configured as a printing surface.
EP15736426.6A 2014-10-15 2015-07-06 Printing sleeve and method for producing a printing sleeve Active EP3206876B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SI201530479T SI3206876T1 (en) 2014-10-15 2015-07-06 Printing sleeve and method for producing a printing sleeve

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014220850.5A DE102014220850A1 (en) 2014-10-15 2014-10-15 Pressure sleeve and method for producing a pressure sleeve
PCT/EP2015/065275 WO2016058714A1 (en) 2014-10-15 2015-07-06 Printing sleeve and method for producing a printing sleeve

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EP3206876A1 EP3206876A1 (en) 2017-08-23
EP3206876B1 true EP3206876B1 (en) 2018-09-19

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EP (1) EP3206876B1 (en)
JP (1) JP6396586B2 (en)
CN (1) CN107073997B (en)
DE (1) DE102014220850A1 (en)
HU (1) HUE040573T2 (en)
SI (1) SI3206876T1 (en)
WO (1) WO2016058714A1 (en)

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EP3698969B1 (en) 2019-02-20 2022-04-20 Flint Group Germany GmbH Low-vibration cylinder
EP3785915B1 (en) * 2019-08-30 2024-04-03 tesa SE Adhesive printing form attachment layer in tube shape, method for its manufacture, and method of operating a printing machine using the same

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Publication number Publication date
US20170239935A1 (en) 2017-08-24
HUE040573T2 (en) 2019-03-28
DE102014220850A1 (en) 2016-04-21
JP2017529266A (en) 2017-10-05
JP6396586B2 (en) 2018-09-26
WO2016058714A1 (en) 2016-04-21
US10471704B2 (en) 2019-11-12
SI3206876T1 (en) 2018-12-31
CN107073997A (en) 2017-08-18
CN107073997B (en) 2019-06-11
EP3206876A1 (en) 2017-08-23

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