EP2930025B1 - Seal element - Google Patents

Seal element Download PDF

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Publication number
EP2930025B1
EP2930025B1 EP14164499.7A EP14164499A EP2930025B1 EP 2930025 B1 EP2930025 B1 EP 2930025B1 EP 14164499 A EP14164499 A EP 14164499A EP 2930025 B1 EP2930025 B1 EP 2930025B1
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EP
European Patent Office
Prior art keywords
sealing
sealing element
sealing surface
anilox roller
vulcanized
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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.)
Not-in-force
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EP14164499.7A
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German (de)
French (fr)
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EP2930025A1 (en
Inventor
Ralf Willutzki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
WIGUTEC GUMMITECHNOLOGIE & CO KG GmbH
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WIGUTEC GUMMITECHNOLOGIE & CO KG GmbH
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Priority to EP14164499.7A priority Critical patent/EP2930025B1/en
Publication of EP2930025A1 publication Critical patent/EP2930025A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • B41F31/02—Ducts, containers, supply or metering devices
    • B41F31/027—Ink rail devices for inking ink rollers

Definitions

  • the present invention relates to a sealing element with a sealing body, on which a sealing surface is formed, in particular for the lateral sealing of the chamber doctor blade of a rotary printing press.
  • Such sealing elements are known in the prior art in different configurations. They are used in particular in the flexographic printing process in web-fed rotary printing presses to laterally seal the chamber doctor blade formed from two doctor blades, the doctor carrier and a segment of the circumferential surface of an anilox roller. The lateral seal creates a liquid-tight ink chamber for receiving and dispensing ink.
  • sealing surfaces of such sealing elements are exposed to strong friction due to the function. This leads to rapid wear of the material by abrasion and heating, so that the sealing elements of the chambered doctor blade must be replaced frequently.
  • the EP 0 949 074 B1 discloses, for example, a sealing element with a body of resilient material and a formed thereon Sealing surface for the lateral sealing of a chamber doctor blade relative to the circumference of an anilox roller. Its sealing surface is covered with a strip of elastic material that is harder than the material of the body. The strip is detachable and fixed at one end to the housing of the chambered doctor blade and / or a doctor blade of the chambered doctor blade, so that it completely covers the main body of the sealing element with respect to the anilox roller and is held in its position by the rotation of the anilox roller. By this measure, the wear of the body is reduced without the sealing effect of the sealing element is impaired.
  • the EP 0 438 731 A2 finally describes a sealing element with a base body made of elastomeric and / or plastic material, the sealing surface is provided to increase the abrasion resistance with a coating which consists of Teflon or a mixture of Teflon and copper or copper powder.
  • the abrasion resistance of the sealing surface can also be achieved by embedding reinforcing bodies of metal or Teflon, as is known from US Pat EP 0 941 846 A1 is known.
  • Teflon polytetrafluoroethylene, PTFE
  • PTFE polytetrafluoroethylene
  • the low coefficient of sliding friction causes the rotation of the anilox roller only a small Requires torque and the heat generated by the rotation of the anilox roller remains low.
  • the low coefficient of static friction also allows a smooth starting of the anilox roller from a stand, since no special starting resistance is overcome.
  • the typical coating thickness of such sealing elements is in the range of a few micrometers.
  • the coating is removed after a relatively short time. This danger exists in particular when so-called. Dry running when no or not enough ink in the chambered doctor blade is present.
  • abrasion-stressed PTFE surfaces can be difficult or clean only with great effort, so that even with a color change replacement of the sealing elements may be required.
  • the present invention provides a sealing element according to claim 1.
  • the sealing element has a sealing body on which a sealing surface is formed, wherein the sealing body consists of a vulcanizable material at least in the region of the sealing surface.
  • the sealing element is characterized in that a sliding material is vulcanized into the sealing surface.
  • a sliding material is vulcanized into the sealing surface.
  • the sliding material is crosslinked with the material of the sealing body.
  • the vulcanization thus leads to a coating to an increased mechanical Stability and a longer service life until complete abrasion of the sliding material.
  • the sliding material may comprise or consist of polytetrafluoroethylene (PTFE).
  • PTFE polytetrafluoroethylene
  • Teflon Polytetrafluoroethylene
  • the sliding material is vulcanized into the sealing surface with a penetration depth of at least 0.2 mm, in particular at least 0.3 mm. This penetration depth is well above the usual thickness of coatings, which is only a few microns.
  • the sealing element can fulfill its function longer before the vulcanized sliding material has been completely removed by the friction of an anilox roller.
  • the sealing surface is easy to clean, even in the partially abraded state, so that the sealing element can be readily used after a color change.
  • the sealing body may comprise a base body and a molded part, wherein the base body and the molded part are firmly connected to each other, in particular glued.
  • the base body is advantageously made of an elastic material, in particular of a foamed material.
  • the molded part has a lower elasticity than the main body.
  • the abrasion on the sealing surface of the molding - already significantly reduced without vulcanized sliding material - compared to the elastic material of the body.
  • this embodiment is especially superior to solutions which directly protect the elastic material of the base body from abrasion and overheating.
  • the molded part may be made of rubber or rubber. Other vulcanizable materials can also be used.
  • the sealing surface is formed such a cylindrical shell-shaped curved, that it is in close contact with the cylinder jacket-shaped peripheral surface of an anilox roller for lateral sealing of a chambered doctor blade. It is thereby achieved that the anilox roller and the molded part touch positively in such a way that lateral leakage of ink from the chambered doctor blade is prevented.
  • FIG. 1 shows an embodiment of a sealing element 1 according to the invention for the lateral sealing of a chambered doctor blade with a sealing body 2, on which a sealing surface 3 is formed.
  • a sliding material 4 is vulcanized.
  • the vulcanized sliding material 4 contains or consists of polytetrafluoroethylene (PTFE, Teflon).
  • PTFE polytetrafluoroethylene
  • Teflon polytetrafluoroethylene
  • the penetration depth of the vulcanized sliding material 4 into the sealing surface 3 is at least 0.2 mm, in particular 0.3 mm, and is thus significantly above the thickness of conventional coatings.
  • the sealing surface 3 has a high lubricity because of the low sliding friction coefficient of PTFE. This reduces the friction of a rotating screen roller and the inevitable heat development.
  • the sealing surface 3 of an adjacent anilox roller due to the low coefficient of static friction of PTFE during start-up only a small resistance, which is overcome without jerk.
  • the sealing element 1 comprises a base body 2a and a molded part 2b.
  • the main body 2a consists of an elastic, in particular foamed material, and is firmly connected to the molded part 2b, in particular glued.
  • the molded part 2b consists of a harder and less elastic material than the main body 2a, in particular of rubber or rubber.
  • the sealing surface 3 is formed on the molded part 2b in the form of a cylindrical shell, in order to enable a form-fitting close contact with the cylinder jacket-shaped circumferential surface of an anilox roller.
  • the FIG. 2 shows the main body 2a and the molded part 2b and a sliding material 4 representing PTFE film of in FIG. 1 pictured seal member 1 in unconnected state.
  • FIG. 3 shows an embodiment of a sealing element according to the invention
  • the sealing surface 3 of the sealing element 1 is in close contact with the peripheral surface 5 of the anilox roller 6 of a web-fed rotary printing machine.
  • the cylindrical shell-shaped curvature of the sealing surface 3 ensures a positive contact of the sealing element 1 with the cylinder jacket-shaped peripheral surface 5 of the anilox roller 6.
  • the elastic force of the base 2a causes the tight contact of the sealing element 1 on the anilox roller 6, so that between the sealing surface 3 and the peripheral surface 5 of the anilox roller 6 can not penetrate color from the chambered doctor blade to the outside.

Landscapes

  • Rolls And Other Rotary Bodies (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Sealing With Elastic Sealing Lips (AREA)

Description

Die vorliegende Erfindung betrifft ein Dichtungselement mit einem Dichtungskörper, an dem eine Dichtungsfläche ausgebildet ist, insbesondere zur seitlichen Abdichtung der Kammerrakel einer Rollrotationsdruckmaschine.The present invention relates to a sealing element with a sealing body, on which a sealing surface is formed, in particular for the lateral sealing of the chamber doctor blade of a rotary printing press.

Derartige Dichtungselemente sind im Stand der Technik in unterschiedlichen Ausgestaltungen bekannt. Sie werden insbesondere beim Flexodruckverfahren in Rollenrotationsdruckmaschinen verwendet, um die aus zwei Rakelmessern, dem Rakelträger und einem Segment der Umfangsfläche einer Rasterwalze gebildete Kammerrakel seitlich abzudichten. Durch die seitliche Abdichtung wird eine flüssigkeitsdichte Farbkammer zur Aufnahme und Abgabe von Druckerfarbe geschaffen.Such sealing elements are known in the prior art in different configurations. They are used in particular in the flexographic printing process in web-fed rotary printing presses to laterally seal the chamber doctor blade formed from two doctor blades, the doctor carrier and a segment of the circumferential surface of an anilox roller. The lateral seal creates a liquid-tight ink chamber for receiving and dispensing ink.

Die Dichtungsflächen derartiger Dichtungselemente sind funktionsbedingt starker Reibung ausgesetzt. Dies führt zu raschem Materialverschleiß durch Abrieb und Erhitzung, so dass die Dichtungselemente der Kammerrakel häufig ausgewechselt werden müssen.The sealing surfaces of such sealing elements are exposed to strong friction due to the function. This leads to rapid wear of the material by abrasion and heating, so that the sealing elements of the chambered doctor blade must be replaced frequently.

Zur Erhöhung der Wirtschaftlichkeit des Rollenrotationsdrucks gehen die Bestrebungen dahin, die Verschleißfestigkeit der Dichtungselemente zu erhöhen. Das gelingt durch den Einsatz von Materialen besonders großer Abrieb- und Hitzebeständigkeit sowie hoher Wärmeleitfähigkeit.To increase the economics of web-fed rotary printing, efforts are being made to increase the wear resistance of the sealing elements. This is achieved through the use of materials with particularly high abrasion and heat resistance as well as high thermal conductivity.

Die EP 0 949 074 B1 offenbart beispielsweise ein Dichtungselement mit einem Grundkörper aus nachgiebigem Material und einer daran ausgebildeten Dichtungsfläche zur seitlichen Abdichtung einer Kammerrakel gegenüber dem Umfang einer Rasterwalze. Dessen Dichtungsfläche ist mit einem Streifen aus elastischem Material bedeckt, das härter ist als das Material des Grundkörpers. Der Streifen ist lösbar und nur mit einem Ende am Gehäuse der Kammerrakel und/oder einem Rakelmesser der Kammerrakel befestigt, so dass er den Grundkörper des Dichtungselements gegenüber der Rasterwalze vollständig abdeckt und durch die Rotation der Rasterwalze in seiner Position gehalten wird. Durch diese Maßnahme wird der Verschleiß des Grundkörpers verringert, ohne dass die Dichtungswirkung des Dichtungselements beeinträchtigt ist.The EP 0 949 074 B1 discloses, for example, a sealing element with a body of resilient material and a formed thereon Sealing surface for the lateral sealing of a chamber doctor blade relative to the circumference of an anilox roller. Its sealing surface is covered with a strip of elastic material that is harder than the material of the body. The strip is detachable and fixed at one end to the housing of the chambered doctor blade and / or a doctor blade of the chambered doctor blade, so that it completely covers the main body of the sealing element with respect to the anilox roller and is held in its position by the rotation of the anilox roller. By this measure, the wear of the body is reduced without the sealing effect of the sealing element is impaired.

Aus der DE 20 2012 102 483 U1 ist ferner bekannt, an dem Grundkörper eines Dichtungselements ein austauschbares Gleitstück vorzusehen. Bei dem Gleitstück handelt es sich um ein Spritzgussteil aus Kunststoff, das Zapfen oder Steckbolzen aufweist, die in entsprechende Aufnahmen des Grundkörpers eingesetzt werden. Ein ähnliches Dichtungselement wird in der DE 20 2009 013 643 U1 offenbart.From the DE 20 2012 102 483 U1 It is also known to provide on the main body of a sealing element an exchangeable slider. In the slider is an injection molded plastic, which has pins or locking pins, which are inserted into corresponding receptacles of the body. A similar sealing element is used in the DE 20 2009 013 643 U1 disclosed.

Die EP 0 438 731 A2 beschreibt schließlich ein Dichtungselement mit einem Grundkörper aus elastomerem und/oder plastischem Material, dessen Dichtungsfläche zur Erhöhung der Abriebbeständigkeit mit einer Beschichtung versehen ist, die aus Teflon oder einer Mischung aus Teflon und Kuper bzw. Kupferpulver besteht. Alternativ lässt sich die Abriebbeständigkeit der Dichtungsfläche auch durch Einbetten von Verstärkungskörpern aus Metall oder Teflon erreichen, wie es aus der EP 0 941 846 A1 bekannt ist.The EP 0 438 731 A2 finally describes a sealing element with a base body made of elastomeric and / or plastic material, the sealing surface is provided to increase the abrasion resistance with a coating which consists of Teflon or a mixture of Teflon and copper or copper powder. Alternatively, the abrasion resistance of the sealing surface can also be achieved by embedding reinforcing bodies of metal or Teflon, as is known from US Pat EP 0 941 846 A1 is known.

Bei Teflon (Polytetrafluorethylen, PTFE) handelt es sich um einen Stoff, der einen sehr geringen Gleitreibungskoeffizienten und einen ebenso geringen, gleich großen Haftreibungskoeffizienten aufweist. Der geringe Gleitreibungskoeffizient bewirkt, dass die Rotation der Rasterwalze nur ein kleines Drehmoment erfordert und die durch die Rotation der Rasterwalze entstehende Wärme gering bleibt. Der geringe Haftreibungskoeffizient ermöglicht überdies ein ruckloses Anlaufen der Rasterwalze aus dem Stand, da kein besonderer Anlaufwiderstand zu überwinden ist.Teflon (polytetrafluoroethylene, PTFE) is a material that has a very low coefficient of sliding friction and an equally low static friction coefficient. The low coefficient of sliding friction causes the rotation of the anilox roller only a small Requires torque and the heat generated by the rotation of the anilox roller remains low. The low coefficient of static friction also allows a smooth starting of the anilox roller from a stand, since no special starting resistance is overcome.

Die typische Beschichtungsdicke solcher Dichtungselemente liegt im Bereich einiger Mikrometer. Dies führt dazu, dass die Beschichtung trotz ihrer hohen Abriebbeständigkeit und ihrer guten Gleiteigenschaften nach relativ kurzer Zeit abgetragen ist. Diese Gefahr besteht insbesondere beim sog. Trockenlauf, wenn keine oder nicht genügend Druckfarbe in der Kammerrakel vorhanden ist. Zudem lassen sich durch Abrieb beanspruchte PTFE-Oberflächen schwierig oder nur mit hohem Aufwand reinigen, so dass auch bei einem Farbwechsel ein Austausch der Dichtungselemente erforderlich sein kann.The typical coating thickness of such sealing elements is in the range of a few micrometers. As a result, despite its high abrasion resistance and good sliding properties, the coating is removed after a relatively short time. This danger exists in particular when so-called. Dry running when no or not enough ink in the chambered doctor blade is present. In addition, abrasion-stressed PTFE surfaces can be difficult or clean only with great effort, so that even with a color change replacement of the sealing elements may be required.

Ausgehend von diesem Stand der Technik ist es eine Aufgabe der vorliegenden Erfindung, ein Dichtungselement der eingangs genannten Art zu schaffen, das eine besonders hohe Laufleistung aufweist und dessen Dichtungsfläche leicht zu reinigen ist.Based on this prior art, it is an object of the present invention to provide a sealing element of the type mentioned, which has a particularly high mileage and the sealing surface is easy to clean.

Zur Lösung dieser Aufgabe schafft die vorliegende Erfindung ein Dichtungselement gemäß Anspruch 1.To achieve this object, the present invention provides a sealing element according to claim 1.

Das Dichtungselement weist einen Dichtungskörper auf, an dem eine Dichtungsfläche ausgebildet ist, wobei der Dichtungskörper zumindest im Bereich der Dichtungsfläche aus einem vulkanisierbaren Material besteht.The sealing element has a sealing body on which a sealing surface is formed, wherein the sealing body consists of a vulcanizable material at least in the region of the sealing surface.

Das Dichtungselement ist dadurch gekennzeichnet, dass ein Gleitmaterial in die Dichtungsfläche einvulkanisiert ist. Durch eine Einvulkanisierung des Gleitmaterials in die Dichtungsfläche wird im Unterschied zu einer bloßen Beschichtung der Dichtungsfläche das Gleitmaterial mit dem Material des Dichtungskörpers vernetzt. Die Einvulkanisierung führt also gegenüber einer Beschichtung zu einer erhöhten mechanischen Stabilität und einer längeren Nutzungsdauer bis zum vollständigen Abrieb des Gleitmaterials.
Vorteilhaft kann das Gleitmaterial Polytetrafluorethylen (PTFE) aufweisen oder daraus bestehen. Polytetrafluorethylen (PTFE, Teflon) besitzt hohe Abriebbeständigkeit und Wärmeleitfähigkeit sowie einen sehr niedrigen Gleitreibungskoeffizienten. Daraus folgt, dass bei der rotationsbedingten Reibung einer Rasterwalze an der Dichtungsfläche nur wenig Wärme entsteht und das einvulkanisierte Gleitmaterial kaum abgetragen wird. Die hohe Wärmeleitfähigkeit wirkt überdies dem Entstehen von Stauwärme entgegen. Dieser Vorteil kommt insbesondere im sog. Trockenlauf zur Geltung, wenn sich keine oder nicht genügend Druckfarbe in der Kammerrakel befindet.
Gemäß einer weiteren Ausführungsform ist es bevorzugt, dass das Gleitmaterial in die Dichtungsfläche mit einer Eindringtiefe von wenigstens 0,2 mm, insbesondere wenigstens 0,3 mm einvulkanisiert ist. Diese Eindringtiefe liegt deutlich über der üblichen Dicke von Beschichtungen, die lediglich einige Mikrometer beträgt. Demzufolge kann das Dichtungselement länger seine Funktion erfüllen, bevor das einvulkanisierte Gleitmaterial durch die Reibung einer Rasterwalze vollständig abgetragen ist. Zudem ist die Dichtungsfläche auch im teilweise abgeriebenen Zustand leicht zu reinigen, so dass das Dichtungselement nach einem Farbwechsel ohne weiteres weiterverwendet werden kann.The sealing element is characterized in that a sliding material is vulcanized into the sealing surface. By vulcanization of the sliding material into the sealing surface, in contrast to a mere coating of the sealing surface, the sliding material is crosslinked with the material of the sealing body. The vulcanization thus leads to a coating to an increased mechanical Stability and a longer service life until complete abrasion of the sliding material.
Advantageously, the sliding material may comprise or consist of polytetrafluoroethylene (PTFE). Polytetrafluoroethylene (PTFE, Teflon) has high abrasion resistance and thermal conductivity as well as a very low sliding friction coefficient. It follows that in the rotation-related friction of an anilox roller at the sealing surface only little heat is produced and the vulcanized sliding material is hardly removed. The high thermal conductivity also counteracts the formation of heat accumulation. This advantage is particularly noticeable in the so-called dry run to advantage when there is no or not enough ink in the chambered doctor blade.
According to a further embodiment, it is preferred that the sliding material is vulcanized into the sealing surface with a penetration depth of at least 0.2 mm, in particular at least 0.3 mm. This penetration depth is well above the usual thickness of coatings, which is only a few microns. As a result, the sealing element can fulfill its function longer before the vulcanized sliding material has been completely removed by the friction of an anilox roller. In addition, the sealing surface is easy to clean, even in the partially abraded state, so that the sealing element can be readily used after a color change.

Bei einer weiteren Ausführungsform kann der Dichtungskörper einen Grundkörper und ein Formteil umfassen, wobei der Grundkörper und das Formteil fest miteinander verbunden, insbesondere verklebt sind. Der Grundkörper besteht dabei vorteilhaft aus einem elastischen Material, insbesondere aus einem geschäumten Material. Der zweiteilige Aufbau des Dichtungselements aus einem Grundkörper und einem Formteil, an dem die Dichtungsfläche angeordnet ist, ermöglicht es, für das Formteil ein im Hinblick auf die gewünschten Funktionen Beständigkeit und Wärmeleitung optimales Material auszuwählen.In a further embodiment, the sealing body may comprise a base body and a molded part, wherein the base body and the molded part are firmly connected to each other, in particular glued. The base body is advantageously made of an elastic material, in particular of a foamed material. The two-part construction of the sealing element of a base body and a molded part, on which the Sealing surface is arranged, makes it possible to select an optimal material in terms of the desired functions resistance and thermal conductivity for the molded part.

In bevorzugter Weise weist das Formteil eine geringere Elastizität als der Grundkörper auf. Bei der Verwendung eines festen, gummi- oder kautschukartigen Materials ist der Abrieb an der Dichtungsfläche des Formteils - bereits ohne einvulkanisiertes Gleitmaterial - gegenüber dem elastischen Material des Grundkörpers deutlich herabgesetzt. Diese Ausgestaltung ist im Hinblick auf die Aufgabenstellung insbesondere solchen Lösungen überlegen, die unmittelbar das elastische Material des Grundkörpers vor Abrieb und Überhitzung schützen.In a preferred manner, the molded part has a lower elasticity than the main body. When using a solid, rubber or rubber-like material, the abrasion on the sealing surface of the molding - already significantly reduced without vulcanized sliding material - compared to the elastic material of the body. With regard to the task, this embodiment is especially superior to solutions which directly protect the elastic material of the base body from abrasion and overheating.

Das Formteil kann aus Gummi oder Kautschuk bestehen. Andere vulkanisierbare Materialien können aber auch eingesetzt werden.The molded part may be made of rubber or rubber. Other vulcanizable materials can also be used.

Bei einer weiteren vorteilhaften Ausgestaltung des erfindungsgemäßen Dichtungselementes ist die Dichtungsfläche derart zylinderschalenförmig gekrümmt ausgebildet, dass sie mit der zylindermantelförmigen Umfangsfläche einer Rasterwalze zur seitlichen Abdichtung einer Kammerrakel in engem Kontakt steht. Dadurch wird erreicht, dass sich Rasterwalze und Formteil formschlüssig derart berühren, dass ein seitliches Austreten von Druckerfarbe aus der Kammerrakel verhindert wird.In a further advantageous embodiment of the sealing element according to the invention, the sealing surface is formed such a cylindrical shell-shaped curved, that it is in close contact with the cylinder jacket-shaped peripheral surface of an anilox roller for lateral sealing of a chambered doctor blade. It is thereby achieved that the anilox roller and the molded part touch positively in such a way that lateral leakage of ink from the chambered doctor blade is prevented.

Weitere Merkmale und Varianten der vorliegenden Erfindung werden anhand der nachfolgenden Beschreibung von Ausführungsbeispielen erfindungsgemäßer Dichtungselemente unter Bezugnahme auf die beiliegenden Zeichnungen deutlich. In der Zeichnung zeigt

Figur 1
eine perspektivische Ansicht eines Ausführungsbeispiels eines erfindungsgemäßen Dichtungselements und
Figur 2
eine perspektivische Explosionsansicht eines Ausführungsbeispiels eines erfindungsgemäßen Dichtungselements und
Figur 3
eine Seitenansicht eines Ausführungsbeispiels eines erfindungsgemäßen Dichtungselements im engen Kontakt zur in Schnittansicht abgebildeten Rasterwalze.
Further features and variants of the present invention will become apparent from the following description of embodiments of inventive sealing elements with reference to the accompanying drawings. In the drawing shows
FIG. 1
a perspective view of an embodiment of a sealing element according to the invention and
FIG. 2
an exploded perspective view of an embodiment of a sealing element according to the invention and
FIG. 3
a side view of an embodiment of a sealing element according to the invention in close contact with the anilox roller shown in sectional view.

Die Figur 1 zeigt ein Ausführungsbeispiel eines erfindungsgemäßen Dichtungselements 1 zur seitlichen Abdichtung einer Kammerrakel mit einem Dichtungskörper 2, an dem eine Dichtungsfläche 3 ausgebildet ist. In die Dichtungsfläche 3 des Dichtungskörpers 1 ist ein Gleitmaterial 4 einvulkanisiert.The FIG. 1 shows an embodiment of a sealing element 1 according to the invention for the lateral sealing of a chambered doctor blade with a sealing body 2, on which a sealing surface 3 is formed. In the sealing surface 3 of the seal body 1, a sliding material 4 is vulcanized.

Das einvulkanisierte Gleitmaterial 4 enthält oder besteht aus Polytetrafluorethylen (PTFE, Teflon). Dadurch besitzt die Dichtungsfläche 3 eine hohe Abrieb- und Hitzebeständigkeit sowie eine hohe Wärmeleitfähigkeit, die eine hohe Verschleißfestigkeit bewirken. Die Eindringtiefe des einvulkanisierten Gleitmaterials 4 in die Dichtungsfläche 3 beträgt mindestens 0,2 mm, insbesondere 0,3 mm, und liegt damit deutlich über der Dicke herkömmlicher Beschichtungen. Darüber hinaus besitzt die Dichtungsfläche 3 wegen des niedrigen Gleitreibungskoeffizienten von PTFE eine hohe Gleitfähigkeit. Das reduziert die Reibung einer rotierenden Rasterwalze sowie die dabei unvermeidliche Wärmeentwicklung. Weiterhin setzt die Dichtungsfläche 3 einer anliegenden Rasterwalze aufgrund des geringen Haftreibungskoeffizienten von PTFE beim Anlaufen nur einen geringen Widerstand entgegen, der ohne Ruck überwunden wird.The vulcanized sliding material 4 contains or consists of polytetrafluoroethylene (PTFE, Teflon). As a result, the sealing surface 3 has a high abrasion and heat resistance and a high thermal conductivity, which cause high wear resistance. The penetration depth of the vulcanized sliding material 4 into the sealing surface 3 is at least 0.2 mm, in particular 0.3 mm, and is thus significantly above the thickness of conventional coatings. In addition, the sealing surface 3 has a high lubricity because of the low sliding friction coefficient of PTFE. This reduces the friction of a rotating screen roller and the inevitable heat development. Furthermore, the sealing surface 3 of an adjacent anilox roller due to the low coefficient of static friction of PTFE during start-up only a small resistance, which is overcome without jerk.

In dem dargestellten Ausführungsbeispiel umfasst das Dichtungselement 1 einen Grundkörper 2a und ein Formteil 2b. Der Grundkörper 2a besteht aus einem elastischen, insbesondere geschäumten Material, und ist fest mit dem Formteil 2b verbunden, insbesondere verklebt. Das Formteil 2b besteht aus einem härteren und weniger elastischen Material als der Grundkörper 2a, insbesondere aus Gummi oder Kautschuk.
Die Dichtungsfläche 3 ist an dem Formteil 2b zylinderschalenförmig ausgebildet, um einen formschlüssigen engen Kontakt mit der zylindermantelförmigen Umfangsfläche einer Rasterwalze zu ermöglichen.
Die Figur 2 zeigt den Grundkörper 2a und das Formteil 2b sowie eine das Gleitmaterial 4 darstellende PTFE-Folie des in Figur 1 abgebildeten Dichtungselements 1 in unverbundenem Zustand.In the illustrated embodiment, the sealing element 1 comprises a base body 2a and a molded part 2b. The main body 2a consists of an elastic, in particular foamed material, and is firmly connected to the molded part 2b, in particular glued. The molded part 2b consists of a harder and less elastic material than the main body 2a, in particular of rubber or rubber.
The sealing surface 3 is formed on the molded part 2b in the form of a cylindrical shell, in order to enable a form-fitting close contact with the cylinder jacket-shaped circumferential surface of an anilox roller.
The FIG. 2 shows the main body 2a and the molded part 2b and a sliding material 4 representing PTFE film of in FIG. 1 pictured seal member 1 in unconnected state.

Die Figur 3 zeigt ein Ausführungsbeispiel eines erfindungsgemäßen DichtungselementsThe FIG. 3 shows an embodiment of a sealing element according to the invention

1 im bestimmungsgemäßen Zustand am seitlichen Ende einer Kammerrakel. Dabei steht die Dichtungsfläche 3 des Dichtungselements 1 in engem Kontakt mit der Umfangsfläche 5 der Rasterwalze 6 einer Rollenrotationsdruckmaschine. Die zylinderschalenförmige Krümmung der Dichtungsfläche 3 sorgt für einen formschlüssigen Kontakt des Dichtungselementes 1 mit der zylindermantelförmigen Umfangsfläche 5 der Rasterwalze 6. Durch die elastische Kraft des Grundkörpers 2a wird das enge Anliegen des Dichtungselements 1 an der Rasterwalze 6 bewirkt, so dass zwischen der Dichtungsfläche 3 und der Umfangsfläche 5 der Rasterwalze 6 keine Farbe aus der Kammerrakel nach außen dringen kann.1 in the intended condition at the lateral end of a chambered doctor blade. In this case, the sealing surface 3 of the sealing element 1 is in close contact with the peripheral surface 5 of the anilox roller 6 of a web-fed rotary printing machine. The cylindrical shell-shaped curvature of the sealing surface 3 ensures a positive contact of the sealing element 1 with the cylinder jacket-shaped peripheral surface 5 of the anilox roller 6. The elastic force of the base 2a causes the tight contact of the sealing element 1 on the anilox roller 6, so that between the sealing surface 3 and the peripheral surface 5 of the anilox roller 6 can not penetrate color from the chambered doctor blade to the outside.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Dichtungselementsealing element
22
Dichtungskörperseal body
2a2a
Grundkörperbody
2b2 B
Formteilmolding
33
Dichtungsflächesealing surface
44
Gleitmaterialsliding
55
Umfangsfläche der RasterwalzePeripheral surface of the anilox roller
66
Rasterwalzeanilox roller

Claims (7)

  1. Sealing element (1) with a sealing body (2) on which a sealing surface (3) is formed, with the sealing body (2) made of a material that can be vulcanized at least in the area of the sealing surface (3), characterized in that a sliding material (4) is vulcanized into the sealing surface (3).
  2. Sealing element (1) according to claim 1, characterized in that the sliding material (4) comprises polytetrafluorethylene (PTFE) or is made of it.
  3. Sealing element (1) according to one of the preceding claims, characterized in that the sliding material (4) is vulcanized into the sealing surface (3) with a penetration depth of at least 0.2 mm, in particular at least 0.3 mm.
  4. Sealing element (1) according to one of the preceding claims, characterized in that the sealing body (2) comprises a basic body (2a) of an elastic material and a formed part (2b), with the basic body (2a) and the formed part (2b) being firmly connected and particularly bonded with each other.
  5. Sealing element (1) according to claim 4, characterized in that the formed part (2b) has a lower elasticity than the basic body (2a).
  6. Sealing element (1) according to claim 4 or 5, characterized in that the formed part (2b) is made of elastic or rubber.
  7. Sealing element (1) according to one of the preceding claims, characterized in that the sealing surface (3) is curved in a cylinder-shell shape so that it is in close contact with the cylinder-jacket-shaped outer surface (5) of an anilox roller (6) for lateral sealing of a chamber blade.
EP14164499.7A 2014-04-11 2014-04-11 Seal element Not-in-force EP2930025B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP14164499.7A EP2930025B1 (en) 2014-04-11 2014-04-11 Seal element

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP14164499.7A EP2930025B1 (en) 2014-04-11 2014-04-11 Seal element

Publications (2)

Publication Number Publication Date
EP2930025A1 EP2930025A1 (en) 2015-10-14
EP2930025B1 true EP2930025B1 (en) 2018-05-30

Family

ID=50542821

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14164499.7A Not-in-force EP2930025B1 (en) 2014-04-11 2014-04-11 Seal element

Country Status (1)

Country Link
EP (1) EP2930025B1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202018101422U1 (en) * 2018-03-14 2019-06-17 Wigutec Gummitechnologie Gmbh & Co. Kg sealing element
US11686391B1 (en) * 2022-12-02 2023-06-27 AJ Flexo Incorporated End seal with self-sealing insert

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4001733A1 (en) 1990-01-22 1991-07-25 Windmoeller & Hoelscher Squeegee device for a reel inking unit of a rotary printing machine
DE59800788D1 (en) 1998-01-28 2001-07-05 Fischer & Krecke Gmbh & Co Squeegee seal
EP0941846A1 (en) * 1998-03-07 1999-09-15 Fischer & Krecke Gmbh & Co. Sealing device for a chambered doctor blade
DE202009013643U1 (en) * 2009-10-26 2011-03-17 Zeljko, Kitic sealing element
DE202012102483U1 (en) 2012-07-05 2012-08-06 MÖLLERING Gummi- und Kunststofftechnik GmbH Chamber knife seal with slider

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP2930025A1 (en) 2015-10-14

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