EP2508350B1 - Metal-back printing blanket - Google Patents

Metal-back printing blanket Download PDF

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Publication number
EP2508350B1
EP2508350B1 EP20110194900 EP11194900A EP2508350B1 EP 2508350 B1 EP2508350 B1 EP 2508350B1 EP 20110194900 EP20110194900 EP 20110194900 EP 11194900 A EP11194900 A EP 11194900A EP 2508350 B1 EP2508350 B1 EP 2508350B1
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Prior art keywords
layer
metal
printing blanket
resin
acting
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EP20110194900
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German (de)
French (fr)
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EP2508350A1 (en
Inventor
Stefan Füllgraf
Jens LÖSCHNER
Hans Jürgen Tatsch
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ContiTech Elastomer Beschichtungen GmbH
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ContiTech Elastomer Beschichtungen GmbH
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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
    • B41N10/00—Blankets or like coverings; Coverings for wipers for intaglio printing
    • B41N10/02—Blanket structure
    • B41N10/04—Blanket structure multi-layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N2210/00—Location or type of the layers in multi-layer blankets or like coverings
    • B41N2210/04—Intermediate layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N2210/00—Location or type of the layers in multi-layer blankets or like coverings
    • B41N2210/06—Backcoats; Back layers; Bottom layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N2210/00—Location or type of the layers in multi-layer blankets or like coverings
    • B41N2210/10—Location or type of the layers in multi-layer blankets or like coverings characterised by inorganic compounds, e.g. pigments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N2210/00—Location or type of the layers in multi-layer blankets or like coverings
    • B41N2210/14—Location or type of the layers in multi-layer blankets or like coverings characterised by macromolecular organic compounds

Definitions

  • the invention relates to a Metall Wegendrucktuch, comprising at least the following layers: a printing layer, a metal foil and a cover layer, which is connected to the side facing away from the printing layer surface of the metal foil.
  • the cover layer which is connected to the surface of the metal foil facing away from the printing layer, serves to protect against corrosion and abrasion of both the metal foil and the impression cylinder.
  • the cover layer is formed as a plastic film, which is connected by means of a hot melt adhesive to the metal foil.
  • a hot melt adhesive makes it easy to create the adhesive bond between the metal foil and the plastic foil.
  • the WO 2004/033224 A1 also discloses a blanket of the above construction in which the printing layer is a polymer layer of EVA, nylon, polyester, polyurethane or polyethylene which can be applied by brushing or spraying, or alternatively is bonded to the metal foil as a foil by means of a conventional adhesive.
  • the printing layer is a polymer layer of EVA, nylon, polyester, polyurethane or polyethylene which can be applied by brushing or spraying, or alternatively is bonded to the metal foil as a foil by means of a conventional adhesive.
  • a disadvantage of the connection of plastic films with an adhesive also that film and adhesive are incompressible and very rigid.
  • the metal back printing blankets are mounted on a printing cylinder, whereby the located on the side facing the printing cylinder materials are compressed, which can lead to variations in thickness, which in turn allows the penetration of detergents in the area between the printing cylinder and blanket. This detergent between blanket and impression cylinder enhances corrosion.
  • the thickness variations can also lead to a deteriorated print image.
  • the invention has for its object to provide a blanket that can withstand the effects of the printing blanket on the blanket environmental influences safely and allows adaptation to the dynamic mechanical requirements of the printing process.
  • the object is achieved in that the cover layer is irreversibly connected to the metal foil via at least one elastomer layer acting as an adhesive layer.
  • a layer of an elastomer As a connecting element between metal foil and cover layer, a layer of an elastomer is used.
  • the layer has elastic and cushioning properties, allowing it to adapt to the needs of the printing process. Since the ink is transferred by pressing, differences in the pressure also affect the print quality.
  • the elastic layer which is also compressible to some extent, it can now be achieved that the different speed ranges and pressures (indentations) are compensated in such a way that they have no negative effect on the printing result. Furthermore, the stiffness of the composite is reduced on the pressure cylinder facing side of the metal layer, so that the blanket can be applied to the impression cylinder without distortions.
  • the elastomer layer acting as an adhesive layer irreversibly bonds the cover layer to the metal foil, an irreversible connection being understood in the context of the invention to mean a thermal stress up to temperatures of at least 80 ° C. and the detergents used in the printing industry with the customary solvents, especially hydrocarbon solvents, withstands.
  • phenolic resins e.g. As phenolic resins, epoxy resins, MFH, urea resins, alkyd resins, polyester resins, polyurethane resins, polyamide resins, vinyl ester resins, resorcinol resins or formaldehyde resins added.
  • the elastomeric layer acting as an adhesive layer is a resorcinol-based resin system, for. B. RFL, and / or contains an isocyanate compound.
  • Resorcinol-based resin systems provide particularly good adhesion to the metal foil.
  • Are isocyanate (polyisocyanates) used in the elastomer layer there may be Desmodur ®.
  • the isocyanate compounds contribute in particular to a good adhesion to the cover layer.
  • the resorcinol-based resin system and / or the isocyanate compound are preferably used in amounts of more than 5 phr.
  • phr parts per hundred parts of rubber by weight
  • the dosage of the parts by weight of the individual substances is always based on 100 parts by weight of the total mass of all the rubbers present in the mixture.
  • the elastomer layer acting as an adhesive layer is based on the same rubber as the print layer. In this way, incompatibilities between the rubber compounds used in the production of the blanket can be avoided and there are logistical advantages.
  • the adhesive layer elastomer layer may be based on different rubber types suitable for blanket printing, such as acrylonitrile butadiene rubber (NBR), hydrogenated acrylonitrile butadiene rubber (HNBR), chloroprene rubber (CR) or butyl rubber (IIR).
  • NBR acrylonitrile butadiene rubber
  • HNBR hydrogenated acrylonitrile butadiene rubber
  • CR chloroprene rubber
  • IIR butyl rubber
  • NBR acrylonitrile-butadiene rubber
  • the elastomer layer acting as an adhesive layer may be formed in one layer. According to a preferred embodiment of the invention, however, the elastomer layer acting as an adhesive layer is formed in multiple layers. The layers can thus be adapted for optimum adhesion either to the metal or to the material of the cover layer.
  • the elastomer layer acting as an adhesive layer is formed compressible.
  • the compressible formation of the elastomer layer can be achieved by air / gas inclusions in the layer, for. B. by addition of chemical blowing agents or hollow spheres with diameters in the micron range.
  • the compressible layer acting as an adhesive elastomer layer preferably has a density of 0.5 to 1.0 g / cm 3 . In this way, the machine vibrations of the printing presses can be optimally damped.
  • the cover layer is a compact plastic film.
  • this consists of PET, PA, PTFE, PI, PEEK or PVC.
  • the advantage of this development is the fact that a plastic film can be easily produced with a uniform thickness, so that it does not come in the blanket to thickness variations due to different thicknesses of the plastic film.
  • the cover layer may be a compressible material. These compressible materials have a lower density than compact films. By the gas inclusions usually present a damping of the system is effected, which ensures a higher process stability in the subsequent application in the printing process. Thickness variations due to swelling at the printing layer of the metal back printing blankets are thereby better compensated.
  • a fleece can be used.
  • the advantage of this development is the fact that a nonwoven can absorb the moisture, which eventually passes between the blanket and the pressure roller when washing the blanket with a detergent. Moisture can occur during the rotation of the pressure roller evenly distributed in the web, so that there is no local thickening of the blanket.
  • the nonwoven offers the advantage that it leads to the chemical adhesion via the elastomer layer in addition to a mechanical toothing of the elastomer layer in the nonwoven and thus to an even better adhesion.
  • the fleece may preferably consist of PE, PP, aramid or PET.
  • porous fabrics of polymeric materials can be used.
  • it is open-pore fabrics made of elastomers or thermoplastic elastomers, such as compressible PU. Again, there is the advantage of mechanical gearing in the open pores of the material.
  • the elastomers or thermoplastic elastomers can also be chemically adapted to the elastomer layer acting as an adhesive layer.
  • the compressible material of the cover layer may be an open-pored paper.
  • the paper is preferably prepared, d. H. It is provided with a hot melt adhesive or an elastomer.
  • the metal back-printing cloth according to the invention can be prepared by methods known to those skilled in the art, wherein the elastomer layer acting as an adhesive layer z. B. in the form of rubber solutions on the cover layer and / or the metal foil can be applied.
  • the figure shows schematically a Metall Wegendrucktuch 2 with a print layer 4, a fabric layer 6, a compressible layer 8, a metal foil 10 and a cover layer 12 which is disposed on the side facing away from the printing layer 4 surface of the metal foil 10.
  • the metal foil 10 projects beyond the remaining layers of the printing blanket 2 at the edges, so that free ends of the metal foil are formed, with the aid of which the blanket 2 is clamped in the nip of a pressure roller, not shown.
  • the blanket may contain additional or alternative layers in addition to the fabric layer.
  • the cover layer 12 is irreversibly connected to the metal foil 10 over an entire area of the elastomeric layer 14 acting as an adhesive layer.
  • the elastomer layer 14 is formed so that the adhesive layer acting as elastomer layer 14, the thermal loads of at least 80 ° C and the detergents used in the printing industry with the usual solvents, in particular hydrocarbon-containing solvents, withstands.
  • Table 1 shows in the left half possible ranges for the individual ingredients and in the right part of an embodiment of a rubber composition, which acts for the adhesive layer acting as an elastomer layer 14.
  • the cover layer 12 was a compact plastic film made of PET.
  • ingredients unit quantity ranges ingredients inventive mixture rubber phr 100 NBR 100 fillers phr 30-90 silica 40 softener phr 20-40 softener 20 resins phr 25-60 phenolic resin 30 phr Cohedur ® / resorcinol 10 Anti-aging agents phr 1-3 Anti-aging agents 1.5 stearic acid phr 0-4 stearic acid 1.5 tin oxide phr 3-15 zinc oxide 10 accelerator phr 0.5-3 accelerator 1.5 sulfur phr 2-5 sulfur 3 properties Release force Metal foil cover layer N / cm ⁇ 0.5 0.8 according to DIN 53530
  • the release force of 0.8 N / cm is in the range in which the release force of metal back printing blankets with a PET film as a cover layer connected via a hot melt adhesive at about 0.5 N / cm.

Description

Die Erfindung betrifft ein Metallrückendrucktuch, aufweisend zumindest folgende Schichten: eine Druckschicht, eine Metallfolie und eine Deckschicht, die mit der von der Druckschicht abgewandten Oberfläche der Metallfolie verbunden ist.The invention relates to a Metallrückendrucktuch, comprising at least the following layers: a printing layer, a metal foil and a cover layer, which is connected to the side facing away from the printing layer surface of the metal foil.

Die Deckschicht, die mit der von der Druckschicht abgewandten Oberfläche der Metallfolie verbunden ist, dient dem Schutz vor Korrosion und Abrieb sowohl der Metallfolie als auch des Druckzylinders.The cover layer, which is connected to the surface of the metal foil facing away from the printing layer, serves to protect against corrosion and abrasion of both the metal foil and the impression cylinder.

Ein oben genanntes Drucktuch ist beispielsweise aus der DE 21 2008 0045 U1 bekannt. Bei dem aus dieser Druckschrift bekannten Drucktuch ist die Deckschicht als Kunststofffolie ausgebildet, die mit Hilfe eines Heißschmelzklebers mit der Metallfolie verbunden ist. Durch die Verwendung eines Heißschmelzklebers ist das Erstellen der Klebeverbindung der Metallfolie mit der Kunststofffolie auf einfache Art und Weise möglich.An above-mentioned blanket is for example from the DE 21 2008 0045 U1 known. In the blanket known from this document, the cover layer is formed as a plastic film, which is connected by means of a hot melt adhesive to the metal foil. The use of a hot melt adhesive makes it easy to create the adhesive bond between the metal foil and the plastic foil.

Die WO 2004/033224 A1 offenbart ebenfalls ein Drucktuch mit vorgenanntem Aufbau, bei dem die Druckschicht eine Polymerschicht aus EVA, Nylon, Polyester, Polyurethan oder Polyethylen ist, die durch Bestreichen oder Sprühen aufgebracht werden kann oder alternativ dazu als Folie mittels eines herkömmlichen Klebstoffes mit der Metallfolie verbunden wird.The WO 2004/033224 A1 also discloses a blanket of the above construction in which the printing layer is a polymer layer of EVA, nylon, polyester, polyurethane or polyethylene which can be applied by brushing or spraying, or alternatively is bonded to the metal foil as a foil by means of a conventional adhesive.

Es hat sich jedoch herausgestellt, dass derartige Verbunde den Anforderungen während des Druckprozesses nicht immer genügen.However, it has been found that such composites do not always meet the requirements during the printing process.

Es ist z. B. festzustellen, dass sich Drucktücher in einer Druckmaschine lokal stark erwärmen können. Es kann dann dazu kommen, dass bei Verwendung von Heißschmelzkleber dieser zwischen der Metallfolie und der Kunststofffolie schmilzt und sich die Kunststofffolie bereichsweise von der Metallfolie ablöst. Eine Ablösung der Kunststofffolie von der Metallfolie kann zu einer unerwünschten Dickenschwankung in dem Drucktuch und damit zu einem verschlechterten Druckbild führen.It is Z. B. determine that blankets can heat up strongly locally in a printing press. It can then happen that when using hot melt adhesive melts this between the metal foil and the plastic film and the plastic film separates partially from the metal foil. A detachment of the plastic film from the metal foil can lead to an undesirable thickness variation in the blanket and thus to a deteriorated print image.

Auch dem chemischen Angriff durch im Druckprozess verwendete Materialien, wie z. B. den zur Säuberung verwendeten Waschmitteln, halten die Verbunde aus Klebstoff und Kunststofffolie nicht in jedem Fall stand.Also the chemical attack by materials used in the printing process, such. As the detergents used for cleaning, keep the composites of adhesive and plastic film in any case.

Nachteilig ist bei der Verbindung von Kunststofffolien mit einem Klebstoff auch, dass Folie und Klebstoff inkompressibel und sehr biegesteif sind. In der Druckindustrie werden die Metallrückendrucktücher auf einen Druckzylinder aufspannt, wodurch die auf der dem Druckzylinder zugewandten Seite befindlichen Materialien gestaucht werden, was zu Dickenschwankungen führen kann, die wiederum das Eindringen von Waschmitteln in den Bereich zwischen Druckzylinder und Drucktuch ermöglicht. Dieses zwischen Drucktuch und Druckzylinder befindliche Waschmittel verstärkt die Korrosion. Die Dickenschwankungen können auch zu einem verschlechterten Druckbild führen.A disadvantage of the connection of plastic films with an adhesive also that film and adhesive are incompressible and very rigid. In the printing industry, the metal back printing blankets are mounted on a printing cylinder, whereby the located on the side facing the printing cylinder materials are compressed, which can lead to variations in thickness, which in turn allows the penetration of detergents in the area between the printing cylinder and blanket. This detergent between blanket and impression cylinder enhances corrosion. The thickness variations can also lead to a deteriorated print image.

Ferner ermöglichen die oben genannten Systeme nur in geringem Maße eine Anpassung an dynamisch-mechanische Erfordernisse des Druckprozesses. So kommt es durch die Maschinenkonfigurationen Gummi/Gummi oder Gummi/Metall(Stahl) zu unterschiedlichen Eindrückungen und damit dynamischen Belastungen. Dies kann bei einigen Druckmaschinen zu Druckaussetzern (fehlender Druck) und damit zu einer Störung der Farbübertragung führen.Furthermore, the above-mentioned systems allow only a small adaptation to dynamic mechanical requirements of the printing process. Thus, the machine configurations rubber / rubber or rubber / metal (steel) lead to different indentations and thus dynamic loads. This can lead to printouts (lack of pressure) on some printing presses and thus to a disturbance of the color transfer.

Der Erfindung liegt die Aufgabe zugrunde, ein Drucktuch zu schaffen, das den während eines Druckvorganges auf das Drucktuch einwirkenden Umgebungseinflüssen sicher standhält und eine Anpassung an die dynamisch-mechanischen Erfordernisse des Druckprozesses erlaubt.The invention has for its object to provide a blanket that can withstand the effects of the printing blanket on the blanket environmental influences safely and allows adaptation to the dynamic mechanical requirements of the printing process.

Die Aufgabe wird dadurch gelöst, dass die Deckschicht über zumindest eine als Haftschicht wirkende Elastomerschicht mit der Metallfolie irreversibel verbunden ist.The object is achieved in that the cover layer is irreversibly connected to the metal foil via at least one elastomer layer acting as an adhesive layer.

Als Verbindungselement zwischen Metallfolie und Deckschicht kommt eine Schicht aus einem Elastomer zum Einsatz. Die Schicht hat elastische und dämpfende Eigenschaften, was eine Anpassung an die Erfordernisse im Druckprozess ermöglicht. Da die Farbe mittels Pressung übertragen wird, bringen Unterschiede in der Pressung auch Einflüsse auf die Druckqualität mit sich. Durch den Einsatz der elastischen Schicht, die auch in gewissem Umfang zusammendrückbar ist, kann es nun erreicht werden, dass die unterschiedlichen Geschwindigkeitsbereiche und Pressungen (Eindrückungen) in der Art kompensiert werden, dass sie keine negativen Auswirkungen auf das Druckergebnis haben. Ferner wird die Steifigkeit des Verbundes auf der dem Druckzylinder zugewandten Seite der Metallschicht verringert, so dass sich das Drucktuch ohne Verwerfungen an den Druckzylinder anlegen lässt.As a connecting element between metal foil and cover layer, a layer of an elastomer is used. The layer has elastic and cushioning properties, allowing it to adapt to the needs of the printing process. Since the ink is transferred by pressing, differences in the pressure also affect the print quality. By using the elastic layer, which is also compressible to some extent, it can now be achieved that the different speed ranges and pressures (indentations) are compensated in such a way that they have no negative effect on the printing result. Furthermore, the stiffness of the composite is reduced on the pressure cylinder facing side of the metal layer, so that the blanket can be applied to the impression cylinder without distortions.

Die als Haftschicht wirkende Elastomerschicht verbindet die Deckschicht irreversible mit der Metallfolie, wobei unter einer irreversiblen Verbindung im Sinne der Erfindung eine Verbindung zu verstehen ist, die thermischen Belastungen bis Temperaturen von mindestens 80°C und den in der Druckindustrie verwendeten Waschmitteln mit den üblichen Lösemitteln, insbesondere kohlenwasserstoffhaltigen Lösemitteln, standhält.The elastomer layer acting as an adhesive layer irreversibly bonds the cover layer to the metal foil, an irreversible connection being understood in the context of the invention to mean a thermal stress up to temperatures of at least 80 ° C. and the detergents used in the printing industry with the customary solvents, especially hydrocarbon solvents, withstands.

Um der Elastomerschicht Hafteigenschaften zu verleihen, werden der Mischung unterschiedliche Harze, z. B. Phenolharze, Epoxidharze, MFH, Harnstoffharze, Alkydharze, Polyesterharze, Polyurethanharze, Polyamidharze,Vinylesterharze, Resorcinharze oder Formaldehydharze, zugesetzt. Um eine besonders gute Haftung zwischen Metallfolie und Deckschicht zu erzielen, hat es sich als vorteilhaft erwiesen, wenn die als Haftschicht wirkende Elastomerschicht ein Harzsystem auf Resorcinbasis, z. B. RFL, und/oder eine Isocyanatverbindung enthält. Harzsysteme auf Resorcinbasis bewirken eine besonders gute Haftung zur Metallfolie. Werden Isocyanatverbindungen (Polyisocyanate) in der Elastomerschicht eingesetzt, kann es sich um Desmodur® handeln.In order to impart adhesive properties to the elastomeric layer, different resins, e.g. As phenolic resins, epoxy resins, MFH, urea resins, alkyd resins, polyester resins, polyurethane resins, polyamide resins, vinyl ester resins, resorcinol resins or formaldehyde resins added. In order to achieve a particularly good adhesion between metal foil and cover layer, it has proved to be advantageous if the elastomeric layer acting as an adhesive layer is a resorcinol-based resin system, for. B. RFL, and / or contains an isocyanate compound. Resorcinol-based resin systems provide particularly good adhesion to the metal foil. Are isocyanate (polyisocyanates) used in the elastomer layer, there may be Desmodur ®.

Die Isocyanatverbindungen tragen insbesondere zu einer guten Haftung zum Deckschicht bei. Das Harzsystem auf Resorcinbasis und/oder die Isocyanatverbindung werden vorzugsweise in Mengen von mehr als 5 phr eingesetzt.The isocyanate compounds contribute in particular to a good adhesion to the cover layer. The resorcinol-based resin system and / or the isocyanate compound are preferably used in amounts of more than 5 phr.

Die in dieser Schrift verwendete Angabe phr (parts per hundred parts of rubber by weight) ist dabei die in der Kautschukindustrie übliche Mengenangabe für Mischungsrezepturen. Die Dosierung der Gewichtsteile der einzelnen Substanzen wird dabei stets auf 100 Gewichtsteile der gesamten Masse aller in der Mischung vorhandenen Kautschuke bezogen.The term phr (parts per hundred parts of rubber by weight) used in this document is the quantity used in the rubber industry for mixture formulations. The dosage of the parts by weight of the individual substances is always based on 100 parts by weight of the total mass of all the rubbers present in the mixture.

Gemäß einer vorteilhaften Weiterbildung der Erfindung basiert die als Haftschicht wirkende Elastomerschicht auf demselben Kautschuk wie die Druckschicht. Auf diese Weise können Unverträglichkeiten zwischen den in der Herstellung des Drucktuches verwendeten Kautschukmischungen vermieden werden und es ergeben sich logistische Vorteile.According to an advantageous embodiment of the invention, the elastomer layer acting as an adhesive layer is based on the same rubber as the print layer. In this way, incompatibilities between the rubber compounds used in the production of the blanket can be avoided and there are logistical advantages.

Die als Haftschicht wirkende Elastomerschicht kann auf unterschiedlichen Kautschuktypen,die für die Drucktuchherstellung geeignet sind,wie Acrylnitril-Butadien-Kautschuk (NBR), hydriertem Acrylnitril-Butadien-Kautschuk (HNBR), Chloroprenkautschuk (CR) oder Butylkautschuk (IIR), basieren. Als besonders vorteilhaft hat es sich jedoch erwiesen, wenn die Haftschicht wirkende Elastomerschicht auf Acrylnitril-Butadien-Kautschuk (NBR) basiert. Diese Ausgestaltung bietet den Vorteil, dass die Schicht sich dann durch eine hohe Quellbeständigkeit und eine gute Dickenkonstanz auszeichnet, was zu guter und lang anhaltenden Druckqualität beiträgt.The adhesive layer elastomer layer may be based on different rubber types suitable for blanket printing, such as acrylonitrile butadiene rubber (NBR), hydrogenated acrylonitrile butadiene rubber (HNBR), chloroprene rubber (CR) or butyl rubber (IIR). However, it has proven to be particularly advantageous if the adhesive layer-acting elastomer layer is based on acrylonitrile-butadiene rubber (NBR). This embodiment offers the advantage that the layer is then characterized by a high resistance to swelling and a good thickness consistency, which contributes to good and long-lasting print quality.

Die als Haftschicht wirkende Elastomerschicht kann einlagig ausgebildet sein. Gemäß einer bevorzugten Weiterbildung der Erfindung ist die als Haftschicht wirkende Elastomerschicht jedoch mehrlagig ausgebildet. Die Lagen können so auf eine optimale Haftung entweder zum Metall oder zum Material der Deckschicht angepasst werden.The elastomer layer acting as an adhesive layer may be formed in one layer. According to a preferred embodiment of the invention, however, the elastomer layer acting as an adhesive layer is formed in multiple layers. The layers can thus be adapted for optimum adhesion either to the metal or to the material of the cover layer.

Vorzugsweise ist die als Haftschicht wirkende Elastomerschicht kompressibel ausgebildet. Dies ermöglicht eine noch weitergehende Anpassung der an die Erfordernisse des Druckprozesses. Die kompressible Ausbildung der Elastomerschicht kann durch Luft-/Gaseinschlüsse in der Schicht, z. B. durch Zugabe von chemischen Treibmitteln oder Hohlkugeln mit Durchmessern im µm-Bereich erfolgen.Preferably, the elastomer layer acting as an adhesive layer is formed compressible. This allows an even further adaptation to the requirements of the printing process. The compressible formation of the elastomer layer can be achieved by air / gas inclusions in the layer, for. B. by addition of chemical blowing agents or hollow spheres with diameters in the micron range.

Die kompressible als Haftschicht wirkende Elastomerschicht weist bevorzugt eine Dichte von 0,5 bis 1,0 g/cm3 auf. Auf diese Weise können die Maschinenschwingungen der Druckmaschinen optimal gedämpft werden.The compressible layer acting as an adhesive elastomer layer preferably has a density of 0.5 to 1.0 g / cm 3 . In this way, the machine vibrations of the printing presses can be optimally damped.

Gemäß einer Weiterbildung der Erfindung handelt es sich bei der Deckschicht um eine kompakte Kunststofffolie. Vorzugsweise besteht diese aus PET, PA, PTFE, PI, PEEK oder aus PVC. Der Vorteil dieser Weiterbildung ist darin zu sehen, dass eine Kunststofffolie einfach mit gleichmäßiger Dicke hergestellt werden kann, so dass es in dem Drucktuch nicht zu Dickenschwankungen aufgrund unterschiedlicher Dicken der Kunststofffolie kommt.According to one embodiment of the invention, the cover layer is a compact plastic film. Preferably, this consists of PET, PA, PTFE, PI, PEEK or PVC. The advantage of this development is the fact that a plastic film can be easily produced with a uniform thickness, so that it does not come in the blanket to thickness variations due to different thicknesses of the plastic film.

Alternativ dazu kann es sich bei der Deckschicht um ein kompressibles Material handeln. Diese kompressiblen Materialien besitzen eine geringere Dichte als kompakte Folien. Durch die in der Regel vorhandenen Gaseinschlüsse wird eine Dämpfung des Systems bewirkt, was bei der späteren Anwendung im Druckprozess eine höhere Prozessstabilität gewährleistet. Dickenschwankungen durch Quellungen an der Druckschicht der Metallrückendrucktücher werden dadurch besser kompensiert.Alternatively, the cover layer may be a compressible material. These compressible materials have a lower density than compact films. By the gas inclusions usually present a damping of the system is effected, which ensures a higher process stability in the subsequent application in the printing process. Thickness variations due to swelling at the printing layer of the metal back printing blankets are thereby better compensated.

Als kompressible Materialien für die Deckschicht sind unterschiedliche Materialen einsetzbar.As compressible materials for the cover layer different materials can be used.

Zum einen kann ein Vlies verwendet werden. Der Vorteil dieser Weiterbildung ist darin zu sehen, dass ein Vlies die Feuchtigkeit aufnehmen kann, die beim Abwaschen des Drucktuches mit einem Waschmittel eventuell zwischen das Drucktuch und die Druckwalze gelangt. Die Feuchtigkeit kann sich bei der Rotation der Druckwalze gleichmäßig in dem Vlies verteilen, so dass es nicht zu einer lokalen Verdickung des Drucktuches kommt. Ferner bietet sich bei dem Vlies der Vorteil, dass es zu der chemischen Haftung über die Elastomerschicht zusätzlich zu einer mechanischen Verzahnung der Elastomerschicht im Vlies und damit zu einer noch besseren Haftung kommt. Das Vlies kann vorzugsweise aus PE, PP, Aramid oder PET bestehen.On the one hand, a fleece can be used. The advantage of this development is the fact that a nonwoven can absorb the moisture, which eventually passes between the blanket and the pressure roller when washing the blanket with a detergent. Moisture can occur during the rotation of the pressure roller evenly distributed in the web, so that there is no local thickening of the blanket. Furthermore, the nonwoven offers the advantage that it leads to the chemical adhesion via the elastomer layer in addition to a mechanical toothing of the elastomer layer in the nonwoven and thus to an even better adhesion. The fleece may preferably consist of PE, PP, aramid or PET.

Zum anderen können porige Flächengebilde aus polymeren Werkstoffen eingesetzt werden. Vorzugsweise handelt es sich um offenporige Flächengebilde aus Elastomeren oder thermoplastischen Elastomeren, wie kompressibles PU. Auch hier bietet sich der Vorteil der mechanischen Verzahnung in den offenen Poren des Materials. Die Elastomere oder thermoplastischen Elastomere können dabei auch auf die als Haftschicht wirkende Elastomerschicht chemisch angepasst werden.On the other hand, porous fabrics of polymeric materials can be used. Preferably, it is open-pore fabrics made of elastomers or thermoplastic elastomers, such as compressible PU. Again, there is the advantage of mechanical gearing in the open pores of the material. The elastomers or thermoplastic elastomers can also be chemically adapted to the elastomer layer acting as an adhesive layer.

Alternativ dazu kann es sich bei dem kompressiblen Material der Deckschicht um ein offenporiges Papier handeln. Zur besseren Anbindung an die Elastomerschicht ist das Papier vorzugsweise präpariert, d. h. es ist mit einem Schmelzkleber oder einem Elastomer versehen.Alternatively, the compressible material of the cover layer may be an open-pored paper. For better connection to the elastomer layer, the paper is preferably prepared, d. H. It is provided with a hot melt adhesive or an elastomer.

Das erfindungsgemäße Metallrückendrucktuch kann nach dem Fachmann bekannten Verfahren hergestellt werden, wobei die als Haftschicht wirkende Elastomerschicht z. B. in Form von Kautschuklösungen auf die Deckschicht und/oder die Metallfolie aufgebracht werden kann.The metal back-printing cloth according to the invention can be prepared by methods known to those skilled in the art, wherein the elastomer layer acting as an adhesive layer z. B. in the form of rubber solutions on the cover layer and / or the metal foil can be applied.

Ein Ausführungsbeispiel und weitere Vorteile der Erfindung werden im Zusammenhang mit der nachstehenden Figur und der Tabelle erläutert.An embodiment and further advantages of the invention will be explained in connection with the following figure and the table.

Die Figur zeigt schematisch ein Metallrückendrucktuch 2 mit einer Druckschicht 4, einer Gewebelage 6, einer kompressiblen Schicht 8, einer Metallfolie 10 und einer Deckschicht 12, die auf der von der Druckschicht 4 abgewandten Oberfläche der Metallfolie 10 angeordnet ist. Die Metallfolie 10 steht an den Rändern jeweils über die übrigen Schichten des Drucktuches 2 hinaus, so dass freie Enden der Metallfolie entstehen, mit deren Hilfe das Drucktuch 2 in den Spalt einer nicht gezeigten Druckwalze eingespannt wird. Das Drucktuch kann neben der Gewebelage weitere oder alternative Schichten enthalten.The figure shows schematically a Metallrückendrucktuch 2 with a print layer 4, a fabric layer 6, a compressible layer 8, a metal foil 10 and a cover layer 12 which is disposed on the side facing away from the printing layer 4 surface of the metal foil 10. The metal foil 10 projects beyond the remaining layers of the printing blanket 2 at the edges, so that free ends of the metal foil are formed, with the aid of which the blanket 2 is clamped in the nip of a pressure roller, not shown. The blanket may contain additional or alternative layers in addition to the fabric layer.

Die Deckschicht 12 ist über eine als Haftschicht wirkende Elastomerschicht 14 ganzflächig mit der Metallfolie 10 irreversibel verbunden. Der Elastomerschicht 14 wird dazu so ausgebildet, dass die als Haftschicht wirkende Elastomerschicht 14 den thermischen Belastungen von mindestens 80°C und den in der Druckindustrie verwendeten Waschmitteln mit den üblichen Lösemitteln, insbesondere kohlenwasserstoffhaltigen Lösemitteln, standhält. Tabelle 1 zeigt in der linken Hälfte mögliche Mengebereiche für die einzelnen Inhaltsstoffe sowie im rechten Teil eine Ausführungsbeispiel für eine Kautschukmischung, die für die als Haftschicht wirkende Elastomerschicht 14. Bei der Deckschicht 12 handelte es sich um eine kompakte Kunststofffolie aus PET. Tabelle 1 Bestandteile Einheit Mengenbereiche Bestandteile erfindungsgemäße Mischung Kautschuk phr 100 NBR 100 Füllstoffe phr 30-90 Kieselsäure 40 Weichmacher phr 20-40 Weichmacher 20 Harze phr 25-60 Phenolharz 30 phr Cohedur®/Resorcin 10 Alterungsschutzmittel phr 1-3 Alterungsschutzmittel 1,5 Stearinsäure phr 0-4 Stearinsäure 1,5 Zinoxid phr 3-15 Zinkoxid 10 Beschleuniger phr 0,5-3 Beschleuniger 1,5 Schwefel phr 2-5 Schwefel 3 Eigenschaften Trennkraft Metallfolie-Deckschicht N/cm ≥ 0,5 0,8 gemäß DIN 53530 The cover layer 12 is irreversibly connected to the metal foil 10 over an entire area of the elastomeric layer 14 acting as an adhesive layer. The elastomer layer 14 is formed so that the adhesive layer acting as elastomer layer 14, the thermal loads of at least 80 ° C and the detergents used in the printing industry with the usual solvents, in particular hydrocarbon-containing solvents, withstands. Table 1 shows in the left half possible ranges for the individual ingredients and in the right part of an embodiment of a rubber composition, which acts for the adhesive layer acting as an elastomer layer 14. The cover layer 12 was a compact plastic film made of PET. <b> Table 1 </ b> ingredients unit quantity ranges ingredients inventive mixture rubber phr 100 NBR 100 fillers phr 30-90 silica 40 softener phr 20-40 softener 20 resins phr 25-60 phenolic resin 30 phr Cohedur ® / resorcinol 10 Anti-aging agents phr 1-3 Anti-aging agents 1.5 stearic acid phr 0-4 stearic acid 1.5 tin oxide phr 3-15 zinc oxide 10 accelerator phr 0.5-3 accelerator 1.5 sulfur phr 2-5 sulfur 3 properties Release force Metal foil cover layer N / cm ≥ 0.5 0.8 according to DIN 53530

Aus der Tabelle wird ersichtlich, dass die Trennkraft mit 0,8 N/cm in dem Bereich liegt, in dem auch die Trennkraft von Metallrückendrucktüchern mit eine PET-Folie als Deckschicht angebunden über einen Heißschmelzklebstoff mit ca. 0,5 N/cm liegt.It can be seen from the table that the release force of 0.8 N / cm is in the range in which the release force of metal back printing blankets with a PET film as a cover layer connected via a hot melt adhesive at about 0.5 N / cm.

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

22
MetallrückendrucktuchMetal-backed blanket
44
Druckschichtprint layer
66
Gewebelagefabric layer
88th
kompressible Schichtcompressible layer
1010
Metallfoliemetal foil
1212
Deckschichttopcoat
1414
Klebeschichtadhesive layer

Claims (12)

  1. Metal-backed printing blanket (2), having at least the following layers:
    - a printing layer (4),
    - a metal foil (10),
    - an outer layer (12) joined to the surface of the metal foil (10) remote from the printing layer,
    characterized in that the outer layer (12) is joined irreversibly to the metal foil (10) via at least one elastomer layer (14) acting as tie layer, the elastomer layer (14) comprising at least one resin selected from the group consisting of phenolic resin, epoxy resin, MFR, urea resin, alkyd resin, polyester resin, polyurethane resin, polyamide resin, vinyl ester resin, resorcinol resin or formaldehyde resin.
  2. Metal-backed printing blanket (2) according to Claim 1, characterized in that the elastomer layer (14) acting as tie layer comprises a resorcinol-based resin system and/or an isocyanate compound.
  3. Metal-backed printing blanket (2) according to Claim 1 or 2, characterized in that the elastomer layer (14) acting as tie layer is based on the same rubber as the printing layer (4).
  4. Metal-backed printing blanket (2) according to any of Claims 1 to 3, characterized in that the elastomer layer (14) is based on an acrylonitrile-butadiene rubber (NBR).
  5. Metal-backed printing blanket (2) according to any of Claims 1 to 4, characterized in that the elastomer layer (14) acting as tie layer is of multi-ply construction.
  6. Metal-backed printing blanket (2) according to any of Claims 1 to 5, characterized in that the elastomer layer (14) acting as tie layer is of compressible construction.
  7. Metal-backed printing blanket (2) according to Claim 6, characterized in that the elastomer layer (14) acting as tie layer has a density of 0.5 to 1.0 g/cm3.
  8. Metal-backed printing blanket (2) according to any of Claims 1 to 7, characterized in that the outer layer (12) is a compact polymeric film.
  9. Metal-backed printing blanket (2) according to any of Claims 1 to 7, characterized in that the outer layer (12) is a compressible material.
  10. Metal-backed printing blanket (2) according to Claim 9, characterized in that the compressible material is a nonwoven web.
  11. Metal-backed printing blanket (2) according to Claim 9, characterized in that the compressible material is an open-pored sheetlike structure composed of a polymeric material.
  12. Metal-backed printing blanket (2) according to Claim 9, characterized in that the compressible material is an open-pored paper, preferably treated for attachment to the elastomer layer (14).
EP20110194900 2011-12-21 2011-12-21 Metal-back printing blanket Active EP2508350B1 (en)

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Publication number Priority date Publication date Assignee Title
DE102013108460A1 (en) * 2013-08-06 2015-02-12 Manroland Web Systems Gmbh MetalBack
JP6134835B1 (en) * 2016-04-12 2017-05-24 株式会社金陽社 Rubber blanket for printing

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004033224A1 (en) 2002-10-11 2004-04-22 Day International, Inc. Printing blanket and method for reducing corrosion and abrasion of printing blankets and blanket cylinders
US6912955B2 (en) * 2003-08-21 2005-07-05 Reeves Brothers, Inc. Metal-backed printing blanket
FR2884753B1 (en) * 2005-04-22 2008-08-08 Macdermid Graphic Arts Sas Soc PRINTING BLANKET TO BE MOUNTED ON A ROTARY SUPPORT CYLINDER OF A PRINTING MACHINE.
ITMI20071350A1 (en) * 2007-07-06 2009-01-07 Trelleborg Engineered Systems METHOD FOR THE REALIZATION OF A COATING (METAL BACK PRINTING BLANKET) OF A TYPOGRAPHIC CYLINDER WITH NON-ADHESIVE PLASTIC SHEET, AND METAL BACK PRINTING BLANKET SO OBTAINED
ITMI20071348A1 (en) * 2007-07-06 2009-01-07 Trelleborg Engineered Systems METHOD FOR THE REALIZATION OF A FINISH (METAL BACK PRINTING BLANKET) OF TYPOGRAPHIC CYLINDER WITH THERMO-ADHESIVE PLASTIC SHEET AS A UNDERWEAR
DE202008000045U1 (en) 2008-05-05 2008-07-03 SGS Genießer Service GmbH & Co. KG overpack

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