EP0196443B1 - Intaglio printing cylinder comprising a core and a detachable sleeve - Google Patents

Intaglio printing cylinder comprising a core and a detachable sleeve Download PDF

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Publication number
EP0196443B1
EP0196443B1 EP19860102237 EP86102237A EP0196443B1 EP 0196443 B1 EP0196443 B1 EP 0196443B1 EP 19860102237 EP19860102237 EP 19860102237 EP 86102237 A EP86102237 A EP 86102237A EP 0196443 B1 EP0196443 B1 EP 0196443B1
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EP
European Patent Office
Prior art keywords
sleeve
printing cylinder
intaglio printing
core
cylinder according
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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
Application number
EP19860102237
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German (de)
French (fr)
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EP0196443A3 (en
EP0196443A2 (en
Inventor
Karl Saueressig
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Saueressig GmbH and Co KG
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Saueressig GmbH and Co KG
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Priority claimed from DE3511530A external-priority patent/DE3511530C2/en
Application filed by Saueressig GmbH and Co KG filed Critical Saueressig GmbH and Co KG
Priority to AT86102237T priority Critical patent/ATE52965T1/en
Publication of EP0196443A2 publication Critical patent/EP0196443A2/en
Priority claimed from EP87101690A external-priority patent/EP0278017A1/en
Publication of EP0196443A3 publication Critical patent/EP0196443A3/en
Application granted granted Critical
Publication of EP0196443B1 publication Critical patent/EP0196443B1/en
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    • 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
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F27/00—Devices for attaching printing elements or formes to supports
    • B41F27/10—Devices for attaching printing elements or formes to supports for attaching non-deformable curved printing formes to forme cylinders
    • B41F27/105—Devices for attaching printing elements or formes to supports for attaching non-deformable curved printing formes to forme cylinders for attaching cylindrical printing formes

Definitions

  • the invention relates to a gravure cylinder, consisting of a core and a sleeve releasably connected thereto, the core being essentially solid and made of metal and provided with channels for guiding compressed air to its outer surface, and wherein the sleeve by means of a Compressed air generated air cushion can be pushed onto and removed from the core.
  • Gravure cylinders of the type mentioned are known per se to the person skilled in the art in the field of printing press technology from tests in the relevant industry. Their purpose is to simplify the handling of the printing cylinders and to reduce the cost of transportation, since the cores remain in the printing shop and only the sleeves without a core are transported back and forth between engraving and printing. Such a gravure cylinder is described in EP-A-0 009 360.
  • Such a gravure cylinder offers the advantage that the inside diameter of the sleeve can be enlarged to an extent sufficient for being pulled onto the core and pulled off the core, and that at the same time the outside diameter and the outside shape of the sleeve are completely constant and constant.
  • the sturdy sleeve ensures exact concentricity during the printing process and thus good print quality. Since the inner layer is only slightly elastic and slightly compressible, relative movements between the core and the sleeve can practically not occur with the pressure forces customary during printing. Due to the possible variation in the thickness of both the inner layer and the middle layer of the sleeve, sleeves with a wide variety of outer diameters or circumferences can be produced with the same inner diameter.
  • the number of core diameters required can thus be drastically reduced by a relatively wide gradation. Due to its inherent stability, the sleeve of the rotogravure cylinder according to the invention is largely protected against deformation and damage during handling and transport, without the need for expensive precautionary measures.
  • a preferred material for the inner layer of the sleeve is rubber, because on the one hand it is freely adjustable in the required elasticity and on the other hand it can be machined with sufficient accuracy.
  • the material of the inner layer of the sleeve is non-porous and that recesses are provided on the outside of the material which allow an increase in the inner diameter of the inner layer.
  • the number, shape, depth and position of the recesses allow the degree of compressibility of the inner layer and thus the degree of enlargeability of the inner diameter of the sleeve to be precisely determined.
  • the arrangement of the recesses on the outside of the inner layer results in an advantageously smooth inner surface of the sleeve, which makes it easier to pull on and off and protects the inner layer from damage.
  • a Shore hardness between 70 and 110 is preferred between 85 and 90.
  • an enlargement of the inner diameter of about 0.1 mm can be achieved, which makes it easy to pull open and Pulling off the sleeve is sufficient.
  • the sleeve could not be pulled off the core with a pulling force of 1500 kp, as was shown in tests.
  • a particularly favorable and advantageous shape of the cutouts on the outside of the inner layer of the sleeve is formed by at least one spiral-shaped, flat groove.
  • This shape offers a particularly high shear stability of the inner layer, since the outside thereof is not divided into separate segments, but rather has a shape that is continuous in the circumferential direction.
  • these recesses e.g. are relatively easy and precise to produce on a lathe.
  • the roundness and concentricity of the sleeve it is provided that at least the inner layer of the sleeve including the recess is made on a nut core with the diameter of the core receiving the sleeve for the printing process.
  • the thickness of the inner layer of the sleeve can be changed.
  • the thickness of the inner layer of the sleeve is preferably between 3 and 30 mm. In this thickness range, both an adequate enlargement of the inner diameter and a sufficient stability and accuracy of the printing cylinder are guaranteed.
  • a preferred material for the middle layer of the sleeve which is responsible for generating the required stability, is glass fiber reinforced plastic. This material has a relatively low weight and offers very high mechanical stability and resilience even with low wall thicknesses, e.g. is known from boat building. To further increase stability, additional reinforcement, preferably made of metal mesh or fabric, can be incorporated into the material.
  • a nickel layer of low thickness is applied 'appropriate to the outside.
  • the application is preferably carried out by electroless nickel plating.
  • the following copper layer can then be generated galvanically, for example.
  • Another material which can advantageously be used for the middle layer of the sleeve is metal, here preferably aluminum or steel. With this, an even higher stability and rigidity of the sleeve can be achieved, but this is associated with a higher weight of the sleeve. Which material is ultimately used in a specific case depends on the needs and requirements of the user and the size of the printing cylinder.
  • a variation in the thickness of the middle layer of the sleeve can also be used to produce different outer diameters of the sleeve with a constant core diameter.
  • the thickness of the middle layer of the sleeve is preferably between 3 and 50 mm. On the one hand, this range of thickness allows a very wide gradation of the core diameter and, on the other hand, ensures sufficient rigidity of the sleeve without the weight of the sleeve becoming too high for easy handling.
  • a ring of electrically conductive material is arranged on the end face of the sleeve in the area of the inner and middle layer, the inside diameter of which is slightly larger than that of the inner layer and its outer diameter corresponds approximately to the outer diameter of the middle layer.
  • These rings can be used to conduct current during the electroplating in a known manner.
  • the end of the copper layer around the edges can also be applied to the outer surface of the rings, which improves the durability of the copper layer on the remaining part of the sleeve and thus the service life of the printing cylinder.
  • the core has, on its outer surface, circumferential flat grooves extending from the ends of the channels for guiding the compressed air. This ensures a uniform distribution of the compressed air and thus the forces generated by it on the inside of the sleeve. Forces of force on the sleeve, which lead to a deviation from the desired exact cylinder shape, are avoided.
  • the number of channels or bores to be introduced into the core for guiding the compressed air to the outside of the core can be reduced in a cost-saving manner.
  • FIG. 1 A preferred exemplary embodiment of the invention is explained in more detail below with reference to a drawing.
  • the only figure of the drawing shows a gravure cylinder according to the present invention in longitudinal section with the sleeve partially removed from the core.
  • the illustrated embodiment of the intaglio cylinder essentially consists of a core 2 and a sleeve 3 surrounding it.
  • the core 2 has the shape of a cylinder with front axle stubs 21 for mounting the printing cylinder during the printing process.
  • the core 2 which is otherwise made of solid metal, generally steel, has a central air duct 22 and a number of this air channels 23 leading radially outwards to the outer surface 25 of the core 2.
  • the central air duct 22 is led outwards on one side and is provided with a connecting piece 26 in the region of the end face of the one axle stub 21.
  • a compressed air hose 4 can be connected to this connecting piece 26 by means of a suitable coupling 41.
  • the sleeve 3 consists essentially of three layers, namely an inner layer 31, a middle layer 33 and an outer layer 34, which are each arranged concentrically to the axis of rotation of the printing cylinder 1.
  • the inner layer 31 of the sleeve 3 consists of an elastic rubber material and has on its outside recesses 32 in the form of grooves running in the circumferential direction.
  • the inside 36 of the inner layer 31, on the other hand, has a smooth surface.
  • the middle layer 33 in the illustrated embodiment consists of a rigid material, here in the exemplary embodiment glass fiber reinforced plastic.
  • a circumferential metal ring 35 which is connected to the two layers 31 and 33, for example by gluing, is arranged on the end face of the inner layer 31 and the middle layer 33.
  • the rings 35 serve to transmit the electrical current required for the galvanic application of the outer layer 34.
  • the outer layer 34 is - as is usual with gravure cylinders - a copper layer. This is also applied to the rings 35 on the end faces 34 'around the edges.
  • the copper layer forming the outer layer 34 preferably has a thickness such that the edges in the region of the end faces 34 'can be rounded off in a sufficient manner.
  • a nickel layer (not shown) can be applied between the middle layer 33 and the outer layer 34 to enable galvanic copper plating before the galvanization.
  • the inner layer 31 and the middle layer 33 are preferably connected to one another by gluing, leaving the cutouts 32 free.
  • the central air channel 22 is supplied with compressed air via the hose 4, which reaches the outside 25 of the core 2 via the radially extending channels 23.
  • circumferential flat grooves 24 are arranged on the outside 25 of the core 2, through which the compressed air is distributed uniformly over the circumference of the core 2.
  • the gap between the outside 25 of the core 2 and the inside 36 of the sleeve is shown exaggeratedly large; in practice, a gap of 0.1 mm or less is sufficient to be able to move the sleeve 3 relative to the core 2 with little effort.
  • the inside 36 of the sleeve 3 lies intimately on the outside 25 of the core 2, whereby a sufficiently firm and dimensionally stable connection between the core 2 and the sleeve 3 is produced.

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  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Printing Plates And Materials Therefor (AREA)

Description

Die Erfindung betrifft einen Tiefdruckzylinder, bestehend aus einem Kern und einer lösbar mit diesem verbundenen Hülse, wobei der Kern im wesentlichen massiv ist und aus Metall besteht und mit Kanälen zur Führung von Druckluft zu seiner Außenfläche versehen ist, und wobei die Hülse mittels eines durch die Druckluft erzeugbaren Luftpolsters auf den Kern aufschiebbar und von diesem abziehbar ist.The invention relates to a gravure cylinder, consisting of a core and a sleeve releasably connected thereto, the core being essentially solid and made of metal and provided with channels for guiding compressed air to its outer surface, and wherein the sleeve by means of a Compressed air generated air cushion can be pushed onto and removed from the core.

Tiefdruckzylinder der genannten Art sind dem Fachmann auf dem Gebiet der Druckmaschinentechnik aus Versuchen der einschlägigen Industrie an sich bekannt. Sie haben den Zweck, die Handhabung der Druckzylinder zu vereinfachen und den Transport zu verbilligen, indem die Kerne im Druckereibetrieb verbleiben und lediglich die Hülsen ohne Kern zwischen Gravurbetrieb und Drukkerei hin und her transportiert werden. Ein solcher Tiefdruckzylinder wird in EP-A-0 009 360 beschrieben.Gravure cylinders of the type mentioned are known per se to the person skilled in the art in the field of printing press technology from tests in the relevant industry. Their purpose is to simplify the handling of the printing cylinders and to reduce the cost of transportation, since the cores remain in the printing shop and only the sleeves without a core are transported back and forth between engraving and printing. Such a gravure cylinder is described in EP-A-0 009 360.

In der Praxis haben sich diese Druckzylinder aber noch nicht durchsetzen können. Der Grund hierfür ist die bisher mangelhafte Qualität der Druckzylinder und des Druckergebnisses derartigerDruckzylinder. Die Ursache für die mangelnde Druckqualität sind in der Ausgestaltung der Hülse zu suchen. Die bekannten Hülsen sind so ausgeführt, daß die eine gewisse Elastizität aufweisen und unter der Einwirkung von Druckluft aufweitbar sind. Hierzu werden z.B. elastische Metalle, wie Nickel, als Hülsenmaterial unterhalb der notwendigerweise vorhandenen äußeren Kupferschicht verwendet. Zur Gewährleistung einer für die erforderliche Aufweitung noch ausreichenden Elastizität der Hülse muß diese relativ dünnwandig ausgeführt sein. Dies wiederum hat zur Folge, daß sich die äußere Kupferschicht im Einsatz leicht von ihrer Unterlage löst und daß so der Druckzylinder unbrauchbar wird. Außerdem besteht die Gefahr, daß die dünnwandigen Hülsen beim Transport oder bei der Handhabung beschädigt werden.In practice, however, these pressure cylinders have not yet been able to establish themselves. The reason for this is the previously poor quality of the printing cylinders and the printing result of such printing cylinders. The reason for the poor print quality can be found in the design of the sleeve. The known sleeves are designed so that they have a certain elasticity and can be expanded under the action of compressed air. For this, e.g. elastic metals, such as nickel, are used as the sleeve material underneath the necessarily present outer copper layer. To ensure sufficient elasticity for the necessary expansion of the sleeve, it must be made relatively thin-walled. This in turn has the consequence that the outer copper layer easily detaches from its base in use and the printing cylinder is thus unusable. There is also a risk that the thin-walled sleeves will be damaged during transport or handling.

Dies deutet bereits auf den nächsten Nachteil hin, der darin besteht, daß trotz der Trennbarkeit von Kern und Hülse die Zahl der vorzuhaltenden, unterschiedlich großen Kerne nicht oder nicht wesentlich vermindert werden kann. Bei beiden bekannten Hülsenausführungen ist die Variationsbreite des Außendurchmessers der Hülse bei festem Innendurchmesser, d.h. festem Außendurchmesser des Kerns, sehr begrenzt.This already indicates the next disadvantage, which is that despite the separability of the core and the sleeve, the number of cores of different sizes to be kept cannot be reduced or can not be significantly reduced. In both known sleeve designs, the range of variation of the outer diameter of the sleeve with a fixed inner diameter, i.e. fixed outer diameter of the core, very limited.

Es stellt sich daher die Aufgabe, einen Tiefdruckzylinder der eingangs genannten Art zu schaffen, der die aufgeführten Nachteile vermeidet, und der insbesondere ein einwandfreies, einem einstückigen Druckzylinder gleichwertiges Druckergebnis gewährleistet, der eine deutliche Reduzierung der vorzuhaltenden Kerngrößen erlaubt und bei dem die Hülse eine für den Druckbetrieb und den Transport sicher ausreichende Stabilität aufweist.It is therefore the task of creating an intaglio cylinder of the type mentioned, which avoids the disadvantages listed, and which in particular ensures a flawless printing result equivalent to a one-piece printing cylinder, which allows a significant reduction in the core sizes to be kept and in which the sleeve is one for the printing operation and transport have sufficient stability.

Die Lösung dieser Aufgabe gelingt erfindungsgemäß durch einen Tiefdruckzylinder der eingangs genannten Art, bei dem die Hülse aus zumindest drei konzentrischen Lagen besteht,This object is achieved according to the invention by a gravure cylinder of the type mentioned at the outset, in which the sleeve consists of at least three concentric layers,

  • daß die innere Lage aus einem geringelastischen Materialbesteht und geringfügig kompressibel ist,that the inner layer consists of a slightly elastic material and is slightly compressible,
  • daß die mittlere Lage aus einem starren und in sich stabilen Material besteht,that the middle layer consists of a rigid and inherently stable material,
  • daß die innere und/oder die mittlere jeweils in ihrer Dicke variieren können, undthat the inner and / or the middle can vary in thickness, and
  • daß die äußere Lage eine Kupferschicht ist.that the outer layer is a copper layer.

Ein derartiger Tiefdruckzylinder bietet den Vorteil, daß der Innendurchmesser der Hülse in einem für das Aufziehen auf den Kern und das Abziehen von dem Kern ausreichenden Maß vergrößerbar ist und daß zugleich der Außendurchmesser und die äußere Form der Hülse völlig konstant und beständig sind. Die stabile Hülse gewährleistet einen exakten Rundlauf während des Druckvorganges und damit eine gute Druckqualität. Da die innere Lage lediglich geringelastisch und geringfügig kompressibel ist, können Relativbewegungen zwischen Kern und Hülse bei den während des Druckens üblichen Andruckkräften praktisch nicht auftreten. Durch die mögliche Variation der Dicke sowohl der inneren Lage als auch der mittleren Lage der Hülse können bei gleichem Innendurchmesser Hülsen mit den unterschiedlichsten Außendurchmessern bzw. Umfängen hergestellt werden. Die Zahl der erforderlichen Kerndurchmesser kann damit durch eine relativ weite Abstufung drastisch verringert werden. Aufgrund ihrer Eigenstabilität ist die Hülse des erfindungsgemäßen Tiefdruckzylinders gegen Verformungen und Beschädigungen bei Handhabung und Transport weitestgehend geschützt, ohne daß aufwendige Vorsichtsmaßnahmen erforderlich wären.Such a gravure cylinder offers the advantage that the inside diameter of the sleeve can be enlarged to an extent sufficient for being pulled onto the core and pulled off the core, and that at the same time the outside diameter and the outside shape of the sleeve are completely constant and constant. The sturdy sleeve ensures exact concentricity during the printing process and thus good print quality. Since the inner layer is only slightly elastic and slightly compressible, relative movements between the core and the sleeve can practically not occur with the pressure forces customary during printing. Due to the possible variation in the thickness of both the inner layer and the middle layer of the sleeve, sleeves with a wide variety of outer diameters or circumferences can be produced with the same inner diameter. The number of core diameters required can thus be drastically reduced by a relatively wide gradation. Due to its inherent stability, the sleeve of the rotogravure cylinder according to the invention is largely protected against deformation and damage during handling and transport, without the need for expensive precautionary measures.

Ein bevorzugtes Material für die innere Lage der Hülse ist Gummi, weil es zum einen in der erforderlichen Elastizität frei einstellbar ist und zum anderen in ausreichender Exaktheit bearbeitbar ist.A preferred material for the inner layer of the sleeve is rubber, because on the one hand it is freely adjustable in the required elasticity and on the other hand it can be machined with sufficient accuracy.

Zwar könnte zur Gewährleistung der Kompressibilität ein poröses Material als inneres Material der Hülse verwendet werden, doch ergibt sich hier der Nachteil, daß das Gesamtvolumen der Porenräume und damit das Maß der Kompressibilität nicht exakt bestimmbar und gleichmäßig innerhalb des Materials verteilbar ist. Es ist deshalb bevorzugt vorgesehen, daß das Material der inneren Lage der Hülse porenfrei ist und daß auf der Außenseite des Materials eine Vergrößerung des Innendurchmessers der inneren Lage erlaubende Aussparungen angeordnet sind. Es kann so durch die Zahl, Form, Tiefe und Lage der Aussparungen das Maß der Kompressibilität der inneren Lage und damit das Maß der Vergrößerbarkeit des Innendurchmessers der Hülse exakt festgelegt werden. Die Anordnung der Aussparungen auf der Außenseite der inneren Lage ergibt eine vorteilhaft glatte Innenfläche der Hülse, was das Auf- und Abziehen erleichtert und die innere Lage vor Beschädigungen schützt.Although a porous material could be used as the inner material of the sleeve to ensure compressibility, there is the disadvantage here that the total volume of the pore spaces and thus the degree of compressibility cannot be determined exactly and can be distributed uniformly within the material. It is therefore preferably provided that the material of the inner layer of the sleeve is non-porous and that recesses are provided on the outside of the material which allow an increase in the inner diameter of the inner layer. The number, shape, depth and position of the recesses allow the degree of compressibility of the inner layer and thus the degree of enlargeability of the inner diameter of the sleeve to be precisely determined. The arrangement of the recesses on the outside of the inner layer results in an advantageously smooth inner surface of the sleeve, which makes it easier to pull on and off and protects the inner layer from damage.

Für das die innere Lage bildende Gummi ist eine Shore-Härte zwischen 70 und 110, vorzugsweise zwischen 85 und 90 vorgesehen. Hiermit läßt sich nach praktischen Versuchen bei Aussparungen im Material von etwa 5% des Geamtvolumens der inneren Lage, bei etwa 5 mm Materialstärke und einem Luftdruck von etwa 6 bar eine Vergrößerung des Innendurchmessers von etwa 0,1 mm erreichen, was für ein leichtgängiges Aufziehen und Abziehen der Hülse ausreicht. Bei nichtangelegter Druckluft konnte dagegen die Hülse mit einer Abzugkraft von 1500 kp nicht vom Kern abgezogen werden, wie sich bei Versuchen zeigte.For the rubber forming the inner layer, a Shore hardness between 70 and 110 is preferred between 85 and 90. With this, after practical tests with recesses in the material of about 5% of the total volume of the inner layer, with a material thickness of about 5 mm and an air pressure of about 6 bar, an enlargement of the inner diameter of about 0.1 mm can be achieved, which makes it easy to pull open and Pulling off the sleeve is sufficient. In contrast, when compressed air was not applied, the sleeve could not be pulled off the core with a pulling force of 1500 kp, as was shown in tests.

Eine besonders günstige und vorteilhafte Form der Aussparungen auf der Außenseite der inneren Lage der Hülse wird durch wenigstens eine wendelartig umlaufende flache Nut gebildet. Diese Form bietet eine besonders hohe Scherstabilität der inneren Lage, da deren Außenseite nicht in separate Segmente geteilt ist, sondern eine in Umfangsrichtung durchgängige Form aufweist. Hinzu kommt, daß diese Aussparungen z.B. auf einer Drehbank relativ leicht und exakt herstellbar sind.A particularly favorable and advantageous shape of the cutouts on the outside of the inner layer of the sleeve is formed by at least one spiral-shaped, flat groove. This shape offers a particularly high shear stability of the inner layer, since the outside thereof is not divided into separate segments, but rather has a shape that is continuous in the circumferential direction. In addition, these recesses e.g. are relatively easy and precise to produce on a lathe.

Zur Gewährleistung einer exakten Einhaltung des Innendurchmessers, der Rundheit und Konzentrizität der Hülse ist vorgesehen, daß zumindest die innere Lage der Hülse einschließlich der Aussparung auf einem Mutterkern mit dem Durchmesser des die Hülse für den Druckvorgang aufnehmenden Kerns hergestellt ist.To ensure exact compliance with the inner diameter, the roundness and concentricity of the sleeve, it is provided that at least the inner layer of the sleeve including the recess is made on a nut core with the diameter of the core receiving the sleeve for the printing process.

Für die Variation der Außendurchmesser der Hülse bei konstantem Kerndurchmesser ist u.a. die Dicke der inneren Lage der Hülse veränderbar. Vorzugsweise beträgt die Dicke der inneren Lage der Hülse zwischen 3 und 30 mm. In diesem Dickenbereich wird sowohl eine ausreichende Vergrößerbarkeit des Innendurchmessers als auch eine genügende Stabilität und Exaktheit des Druckzylinders gewährleistet.For the variation of the outer diameter of the sleeve with constant core diameter, the thickness of the inner layer of the sleeve can be changed. The thickness of the inner layer of the sleeve is preferably between 3 and 30 mm. In this thickness range, both an adequate enlargement of the inner diameter and a sufficient stability and accuracy of the printing cylinder are guaranteed.

Ein bevorzugtes Material für die mittlere Lage der Hülse, die für die Erzeugung der erforderlichen Stabilität verantwortlich ist, ist glasfaserverstärkter Kunststoff. Dieses Material besitzt ein relativ geringes Gewicht und bietet schon bei geringen Wandungsstärken eine sehr hohe mechanische Stabilität und Beanspruchbarkeit, wie z.B. aus dem Bootsbau bekannt ist. Zur weiteren Erhöhung der Stabilität kann in das Material nocheine zusätzliche Armierung, vorzugsweise aus Metallgitter- oder Gewebe eingebracht sein.A preferred material for the middle layer of the sleeve, which is responsible for generating the required stability, is glass fiber reinforced plastic. This material has a relatively low weight and offers very high mechanical stability and resilience even with low wall thicknesses, e.g. is known from boat building. To further increase stability, additional reinforcement, preferably made of metal mesh or fabric, can be incorporated into the material.

Zur Sicherstellung einer intensiven und dauerhaften Verbindung der äußeren Kupferschicht mit dem übrigen Teil der Hülse ist zweckmäßig auf die Außenseite der mittleren Lage eine Nickelschicht geringer Dicke' aufgebracht. Die Aufbringung erfolgt vorzugsweise durch stromlose Vernickelung. Die folgende Kupferschicht kann dann z.B. galvanisch erzeugt werden.In order to ensure a deep and durable connection of the outer copper layer with the remaining part of the sleeve of the middle layer is a nickel layer of low thickness is applied 'appropriate to the outside. The application is preferably carried out by electroless nickel plating. The following copper layer can then be generated galvanically, for example.

Ein anderes für die mittlere Lage der Hülse vorteilhaft verwendbares Material ist Metall, hier vorzugsweise Aluminium oder Stahl. Hiermit kann eine noch höhere Stabilität und Starrheit der Hülse erreicht werden, was aber mit einem höheren Gewicht der Hülse verbunden ist. Welches Material letztendlich im konkreten Fall verwendet wird, hängt von den Erfordernissen und Ansprüchen des Anwenders sowie von der Größe des Druckzylinders ab.Another material which can advantageously be used for the middle layer of the sleeve is metal, here preferably aluminum or steel. With this, an even higher stability and rigidity of the sleeve can be achieved, but this is associated with a higher weight of the sleeve. Which material is ultimately used in a specific case depends on the needs and requirements of the user and the size of the printing cylinder.

Neben der Variation der Dicke der inneren Lage der Hülse kann auch eine Variation der Dicke der mittleren Lage der Hülse zur Erzeugung unterschiedlicher Außendurchmesser der Hülse bei konstantem Kerndurchmesser dienen. Die Dicke der mittleren Lage der Hülse beträgt dabei vorzugsweise zwischen 3 und 50 mm. Dieser Dickenbereich erlaubt einerseits eine sehr weite Abstufung der Kerndurchmesser und gewährlesitet andererseits eine ausreichende Starrheit der Hülse, ohne daß deren Gewicht für eine einfache Handhabung zu hoch wird.In addition to the variation in the thickness of the inner layer of the sleeve, a variation in the thickness of the middle layer of the sleeve can also be used to produce different outer diameters of the sleeve with a constant core diameter. The thickness of the middle layer of the sleeve is preferably between 3 and 50 mm. On the one hand, this range of thickness allows a very wide gradation of the core diameter and, on the other hand, ensures sufficient rigidity of the sleeve without the weight of the sleeve becoming too high for easy handling.

Zum mechanischen Shutz der Stirnseiten der Hülse und zur Ermöglichung eines galvanischen Verkupferns entsprechend dem Verfahren bei üblichen einstückigen Druckzylindern ist vorgesehen, daß an der Hülse stirnseitig im Bereich der inneren und mittleren Lage je ein Ring aus elektrisch leitendem Material angeordnet ist, dessen Innendurchmesser geringfügig größer ist als der der inneren Lage und dessen Außendurchmesser etwa dem Außendurchmesser der mittleren Lage entspricht. Über diese Ringe kann in bekannter Weise die Stromleitung während des Galvanisierens erfolgen. Außerdem kann die Kupferschicht stirnseitig um die Kanten herum auch auf die Außenfläche der Ringe aufgebracht werden, was die Haltbarkeit der Kupferschicht auf dem übrigen Teil der Hülse und damit die Standzeit des Druckzylinders verbessert.For mechanical protection of the end faces of the sleeve and to enable galvanic copper-plating in accordance with the method in conventional one-piece pressure cylinders, it is provided that a ring of electrically conductive material is arranged on the end face of the sleeve in the area of the inner and middle layer, the inside diameter of which is slightly larger than that of the inner layer and its outer diameter corresponds approximately to the outer diameter of the middle layer. These rings can be used to conduct current during the electroplating in a known manner. In addition, the end of the copper layer around the edges can also be applied to the outer surface of the rings, which improves the durability of the copper layer on the remaining part of the sleeve and thus the service life of the printing cylinder.

Schließlich ist bei dem Druckzylinder gemäß vorliegender Erfindung noch vorgesehen, daß der Kern auf seiner Außenfläche von den Enden der Kanäle für die Führung der Druckluft ausgehende, umlaufende flache Nuten aufweist. Hierdurch wird eine gleichmäßige Verteilung der Druckluft und damit der durch diese erzeugten Kräfte auf die Innenseite der Hülse gewährleistet. Krafteinwirkungen auf die Hülse, die zu einer Abweichung von der erwünschten exakten Zylinderform führen, werden so vermieden. Außerdem kann so die Zahl der in den Kern einzubringenden Kanäle oder Bohrungen zur Führung der Druckluft zur Kernaußenseite kostensparend vermindert werden.Finally, in the case of the pressure cylinder according to the present invention it is also provided that the core has, on its outer surface, circumferential flat grooves extending from the ends of the channels for guiding the compressed air. This ensures a uniform distribution of the compressed air and thus the forces generated by it on the inside of the sleeve. Forces of force on the sleeve, which lead to a deviation from the desired exact cylinder shape, are avoided. In addition, the number of channels or bores to be introduced into the core for guiding the compressed air to the outside of the core can be reduced in a cost-saving manner.

Im folgenden wird ein bevorzugtes Ausführungsbeispiel der Erfindung anhand einer Zeichnung näher erläutert. Die einzige Figur der Zeichnung zeigt einen Tiefdruckzylinder gemäß der vorliegenden Erfindung im Längsschnitt mit teilweise vom Kern abgezogener Hülse.A preferred exemplary embodiment of the invention is explained in more detail below with reference to a drawing. The only figure of the drawing shows a gravure cylinder according to the present invention in longitudinal section with the sleeve partially removed from the core.

Wie aus der Figur ersichtlich ist, besteht das dargestellte Ausführungsbeispiel des Tiefdruckzylinders im wesentlichen aus einem Kern 2 und einer diesen umgebenden Hülse 3. Der Kern 2 hat die Form eines Zylinders mit stirnseitigen Achsstummeln 21 zur Lagerung des Druckzylinders während des Druckvorganges. In seinem Inneren weist der ansonsten aus massivem Metall, im allgemeinen Stahl, bestehende Kern 2 einen zentralen Luftkanal 22 sowie eine Anzahl von von diesem radial nach außen zur Außenfläche 25 des Kerns 2 führenden Luftkanälen 23 auf. Einseitig ist der zentrale Luftkanal 22 nach außen durchgeführt und im bereich der Stirnseite des einen Achsstummels 21 mit einem Anschlußstück 26 versehen. An dieses Anschlußstück 26 ist mittels einer passenden Kupplung 41 ein Druckluftschlauch 4 anschließbar.As can be seen from the figure, the illustrated embodiment of the intaglio cylinder essentially consists of a core 2 and a sleeve 3 surrounding it. The core 2 has the shape of a cylinder with front axle stubs 21 for mounting the printing cylinder during the printing process. Inside, the core 2, which is otherwise made of solid metal, generally steel, has a central air duct 22 and a number of this air channels 23 leading radially outwards to the outer surface 25 of the core 2. The central air duct 22 is led outwards on one side and is provided with a connecting piece 26 in the region of the end face of the one axle stub 21. A compressed air hose 4 can be connected to this connecting piece 26 by means of a suitable coupling 41.

Die Hülse 3 besteht im wesentlichen aus drei Lagen, nämlich einer inneren Lage 31, einer mittleren Lage 33 und einer äußeren Lage 34, die jeweils konzentrisch zur Rotationsachse des Druckzylinders 1 angeordnet sind. Die innere Lage 31 der Hülse 3 besteht aus einem elastischen Gummimaterial, und weist auf ihrer Außenseite Aussparungen 32 in Form von in Umfangsrichtung verlaufenden Nuten auf. Die Innenseite 36 der inneren Lage 31 ist dagegen glattflächig ausgeführt. Die mittlere Lage 33 besteht im dargestellten Ausführungsbeispiel aus einem starren Material, hier im Ausführungsbeispiel glasfaserverstärkter Kunststoff. An die innere Lage 31 und die mittlere Lage 33 ist stirnseitig auf jeder Seite ein umlaufender Metallring 35 angeordnet, der mit den beiden Lagen 31 und 33 beispielsweise durch Verklebung verbunden ist. Außer als mechanischer Shutz für die beiden Lagen 31 und 33 dienen die Ringe 35 der Übertragung des für eine galvanische Aufbringung der äußeren Lage 34 erforderlichen elektrischen Stromes. Bei der äußeren Lage 34 handelt es sich-wie bei Tiefdruckzylindern üblich-um eine Kupferschicht. Diese ist an den Stirnseiten 34' kantenumgreifend auch auf die Ringe 35 aufgebracht. Dabei weist die die äußere Lage 34 bildende Kupferschicht vorzugsweise eine solche Dicke auf, daß die Kanten im Bereich der Stirnseiten 34' in ausreichender Weise abgerundet werden können.The sleeve 3 consists essentially of three layers, namely an inner layer 31, a middle layer 33 and an outer layer 34, which are each arranged concentrically to the axis of rotation of the printing cylinder 1. The inner layer 31 of the sleeve 3 consists of an elastic rubber material and has on its outside recesses 32 in the form of grooves running in the circumferential direction. The inside 36 of the inner layer 31, on the other hand, has a smooth surface. The middle layer 33 in the illustrated embodiment consists of a rigid material, here in the exemplary embodiment glass fiber reinforced plastic. A circumferential metal ring 35, which is connected to the two layers 31 and 33, for example by gluing, is arranged on the end face of the inner layer 31 and the middle layer 33. In addition to providing mechanical protection for the two layers 31 and 33, the rings 35 serve to transmit the electrical current required for the galvanic application of the outer layer 34. The outer layer 34 is - as is usual with gravure cylinders - a copper layer. This is also applied to the rings 35 on the end faces 34 'around the edges. The copper layer forming the outer layer 34 preferably has a thickness such that the edges in the region of the end faces 34 'can be rounded off in a sufficient manner.

Zwischen der mittleren Lage 33 und der äußeren lage 34 kann zur Ermöglichung einer galvanischen Verkupferung vor der Galvanisierung eine Nickelschicht (nicht dargestellt) aufgebracht werden.A nickel layer (not shown) can be applied between the middle layer 33 and the outer layer 34 to enable galvanic copper plating before the galvanization.

Die innere Lage 31 und die mittlere Lage 33 sind vorzugsweise unter Freilassung der Aussparungen 32 miteinander durch Verklebung verbunden.The inner layer 31 and the middle layer 33 are preferably connected to one another by gluing, leaving the cutouts 32 free.

Zur Ermöglichung eines Abziehens der Hülse 3 vom Kern 2 bzw. eines Aufschiebens der Hülse 3 auf den Kern 2 wird der zentrale Luftkanal 22 über den Schlauch 4 mit Druckluft beschickt, die über die radial verlaufenden Kanäle 23 zur Außenseite 25 des Kerns 2 gelangt. Im Bereich der äußeren Enden der radial verlaufenden Kanäle 23 sind auf derAußenseite 25 des Kerns 2 in Umfangsrichtung umlaufende flache Nuten 24 angeordnet, durch welche sich die Druckluft gleichmäßig auf dem Umfang des Kerns 2 verteilt. Hierdurch wird zwischen der Außenseite 25 des Kerns 2 und der Innenseite 36 der Hülse 3 ein Luftpolster von einer für ein leichtes Aufschieben bzw. Abziehen der Hülse 3 ausreichenden Dicke erzeugt. In der Figur ist der Spaltraum zwischen der Außenseite 25 des Kerns 2 und der Innenseite 36 der Hülse übertrieben groß dargestellt; in der Praxis genügt bereits ein Spaltraum von 0,1 mm oder weniger, um die Hülse 3 gegenüber dem Kern 2 mit geringem Kraftaufwand bewegen zu können. Nach Wegnahme des Druckes der zugeführten Luft, z.B. durch Abnehmen des Schlauches 4 vom Schlauchanschluß 26 des Kerns 2 legt sich die Innenseite 36 der Hülse 3 innig an die Außenseite 25 des Kerns 2 an, wodurch eine ausreichend feste und formstabile Verbindung zwischen Kern 2 und Hülse 3 hergestellt wird.To enable the sleeve 3 to be pulled off the core 2 or the sleeve 3 to be pushed onto the core 2, the central air channel 22 is supplied with compressed air via the hose 4, which reaches the outside 25 of the core 2 via the radially extending channels 23. In the area of the outer ends of the radially extending channels 23, circumferential flat grooves 24 are arranged on the outside 25 of the core 2, through which the compressed air is distributed uniformly over the circumference of the core 2. As a result, an air cushion of a thickness sufficient for easy sliding on or pulling off the sleeve 3 is generated between the outside 25 of the core 2 and the inside 36 of the sleeve 3. In the figure, the gap between the outside 25 of the core 2 and the inside 36 of the sleeve is shown exaggeratedly large; in practice, a gap of 0.1 mm or less is sufficient to be able to move the sleeve 3 relative to the core 2 with little effort. After removing the pressure of the supplied air, e.g. by removing the hose 4 from the hose connection 26 of the core 2, the inside 36 of the sleeve 3 lies intimately on the outside 25 of the core 2, whereby a sufficiently firm and dimensionally stable connection between the core 2 and the sleeve 3 is produced.

Claims (14)

1. Intaglio printing cylinder, consisting of a core (2) and a sleeve (3) detachably connected thereto, the core being substantially solid and made of metal and being provided with ducts (22, 23) for guidance of compressed air to the outer surface thereof, and the sleeve being slidable onto the core by means of an air cushion which can be generated by the compressed air, and being removable from said core,
characterised in that the sleeve (3) consists of at least three concentric layers (31, 33, 34),
that the inner layer (31) consists of a slightly elastic material and is slightly compressible,
that the middle layer (33) consists of a rigid material which is stable in itself,
that the inner and/or the middle (31, 33) layers may each vary in thickness, and
that the outer layer (34) is a copper layer.
2. Intaglio printing cylinder according to Claim 1, characterised in that the inner layer (31) of the sleeve (3) is made of rubber.
3. Intaglio printing cylinder according to Claim 1 or 2, characterised in that the material of the inner layer (31) of the sleeve (3) is pore-free and that recesses (32) permitting enlargement of the internal diameter of the inner layer (31) are arranged on the outside of the material.
4. Intaglio printing cylinder according to Claims 1 to 3, characterised in that the rubber forming the inner layer (31) of the sleeve (3) has a Shore hardness of between 70 and 110, preferably between 85 and 90.
5. Intaglio printing cylinder according to Claims 1 to 4, characterised in that the recesses (32) on the outside of the inner layer (31) of the sleeve (3) are formed by at least one surface groove which circulates in helical manner.
6. Intaglio printing cylinder according to Claims 1 to 5, characterised in that at least the inner layer (31) of the sleeve (3) including the recess (32) is produced on a mother core having the diameter of the core (2) receiving the sleeve (3) for the printing operation.
7. Intaglio printing cylinder according to Claims 1 to 6, characterised in that the thickness of the inner layer (31) of the sleeve (3) is between 3 and 30 mm.
8. Intaglio printing cylinder according to Claim 1, characterised in that the middle layer (33) of the sleeve (3) is made of glass fibre- reinforced plastic.
9. Intaglio printing cylinder according to Claims 1 and 8, characterised in that the middle layer (33) of the sleeve (3) has a reinforcement, preferably made out of metal grid or mesh.
10. Intaglio printing cylinder according to Claims 1, 8 and 9, characterised in that a nickel layer of low thickness is applied to the outside of the middle layer (33) of the sleeve (3).
11. Intaglio printing cylinder according to Claim 1, characterised in that the middle layer (33) of the sleeve (3) is made of metal, preferably aluminium or steel.
12. Intaglio printing cylinder according to Claims 1 and 8 to 11, characterised in that the thickness of the middle layer (33) of the sleeve (3) is between 3 and 50 mm.
13. Intaglio printing cylinder according to Claims 1 to 12, characterised in that one ring (15) in each case of electrically conductive material is disposed on the ends of the sleeve (3) in the region of the inner and middle layers (31, 33), the internal diameter of which ring is slightly larger than that of the inner layer (31), and the external diameter of which ring corresponds approximately to the external diameter of the middle layer (33).
14. Intaglio printing cylinder according to Claims 1 to 13, characterised in that the core (2) has peripheral surface grooves (24) starting from the ends of the ducts (23) for the guidance of the compressed air on its outer surface (25).
EP19860102237 1985-03-29 1986-02-20 Intaglio printing cylinder comprising a core and a detachable sleeve Expired - Lifetime EP0196443B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86102237T ATE52965T1 (en) 1985-03-29 1986-02-20 GRAVITY PRESSURE CYLINDER, CONSISTING OF A CORE AND A SLEEVE DETACHABLE WITH THIS CONNECTED.

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE3511530 1985-03-29
DE3511530A DE3511530C2 (en) 1985-03-29 1985-03-29 Gravure cylinder
EP87101690A EP0278017A1 (en) 1987-02-07 1987-02-07 Intaglio printing cylinder comprising a core and a detachable sleeve

Publications (3)

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EP0196443A2 EP0196443A2 (en) 1986-10-08
EP0196443A3 EP0196443A3 (en) 1987-12-02
EP0196443B1 true EP0196443B1 (en) 1990-05-23

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4341262A1 (en) * 1993-01-22 1994-07-28 Heidelberger Druckmasch Ag Device for reducing bulges of material on a tubular pressure sleeve
US7316183B2 (en) 2002-09-06 2008-01-08 Polywest Kunststofftechnik Saueressig & Partner Gmbh & Co. Kg Sleeve with multiple layer structure for printing presses and method for its manufacture
DE10345562B4 (en) * 2003-10-01 2014-09-04 Sächsische Walzengravur GmbH Disposable sleeve for releasable attachment either on a support roller or on an adapter sleeve of the support roller for printing, painting and coating

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EP0278017A1 (en) * 1987-02-07 1988-08-17 Saueressig Gmbh & Co. Intaglio printing cylinder comprising a core and a detachable sleeve
ES2022212B3 (en) * 1987-06-19 1991-12-01 Saueressig Gmbh + Co ENGRAVING HOLLOW CYLINDER CONSISTING OF A NUCLEUS AND A RELEASABLE SLEEVE ATTACHED WITH SUCH NUCLEUS
FR2684924B1 (en) * 1991-12-11 1994-03-04 Jean Francille SLEEVE HOLDER FOR FLEXOGRAPHIC PRINTING CYLINDER.
EP0683040B1 (en) 1994-05-19 1998-09-30 Jean Francille Process for the manufacture of a sleeve for a printing machine, and sleeve obtained thereby
DE4432816A1 (en) * 1994-09-15 1996-03-21 Roland Man Druckmasch Printing roller for channelless printing
ATE212582T1 (en) * 1995-11-30 2002-02-15 Criado Manuel Montenegro ANVIL FOR ROTATING SLOTTING AND CUTTING DEVICES
US5906149A (en) * 1995-11-30 1999-05-25 Montenegro Criado; Manuel Anvil for rotary slotting and cutting machines
US5840386A (en) * 1996-02-22 1998-11-24 Praxair S.T. Technology, Inc. Sleeve for a liquid transfer roll and method for producing it
DE19918432A1 (en) * 1999-04-23 2000-10-26 Saueressig Gmbh & Co Expansion layer of compressible material between core cylinder and its sleeve is provided with depressions on its outer or inner circumferential surface
DE10039744B4 (en) * 2000-08-16 2008-06-05 Hueck Folien Gesellschaft M.B.H. Clamping cylinder for holding and fixing a cylindrical embossing mold with a structured surface
FR2815572B1 (en) * 2000-10-24 2003-06-27 Jean Francille RADIAL EXPANSION MOUNT PRINT SLEEVE
US6905119B2 (en) * 2002-06-19 2005-06-14 Hewlett-Packard Development Company, L.P. Pressurized roller
ATE470570T1 (en) * 2005-07-18 2010-06-15 Hueck Folien Gmbh PRINT CYLINDER WITH REMOVABLE EMBOSSING MOLD
LU91741B1 (en) * 2010-09-24 2012-03-26 Euro Composites Multi-layer expandable sleeve for a printing press cylinder, in particular for flexographic printing
US8871431B2 (en) 2011-08-08 2014-10-28 Timothy Gotsick Laminated flexographic printing sleeves and methods of making the same
CN107351519B (en) * 2017-08-22 2019-11-12 赣州彩盛印刷有限公司 A kind of intaglio press

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US3015268A (en) * 1958-04-04 1962-01-02 Russell U Garrett Laminated printing plate and process for making same
IN146438B (en) * 1976-01-08 1979-06-02 Strachan & Henshaw Ltd
DE2966610D1 (en) * 1978-09-13 1984-03-08 Drg Uk Ltd Manufacture of printing sleeves
IT8268063A0 (en) * 1982-09-02 1982-09-02 Saiag Spa RUBBER-COATED ROLLER FOR TEXTILE FIBER STRIPPING MACHINES AND SIMILAR APPLICATIONS

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4341262A1 (en) * 1993-01-22 1994-07-28 Heidelberger Druckmasch Ag Device for reducing bulges of material on a tubular pressure sleeve
DE4341262C2 (en) * 1993-01-22 1999-04-08 Heidelberger Druckmasch Ag Device for reducing bulges of material on a tubular pressure sleeve
US7316183B2 (en) 2002-09-06 2008-01-08 Polywest Kunststofftechnik Saueressig & Partner Gmbh & Co. Kg Sleeve with multiple layer structure for printing presses and method for its manufacture
DE10241800B4 (en) * 2002-09-06 2014-04-30 Polywest Kunststofftechnik Saueressig & Partner Gmbh & Co. Kg Multilayer sleeve for printing machines and method for its production
DE10345562B4 (en) * 2003-10-01 2014-09-04 Sächsische Walzengravur GmbH Disposable sleeve for releasable attachment either on a support roller or on an adapter sleeve of the support roller for printing, painting and coating

Also Published As

Publication number Publication date
EP0196443A3 (en) 1987-12-02
EP0196443A2 (en) 1986-10-08

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