EP2473358B1 - Multilayer sheet material and method for the production thereof - Google Patents

Multilayer sheet material and method for the production thereof Download PDF

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Publication number
EP2473358B1
EP2473358B1 EP10745221.1A EP10745221A EP2473358B1 EP 2473358 B1 EP2473358 B1 EP 2473358B1 EP 10745221 A EP10745221 A EP 10745221A EP 2473358 B1 EP2473358 B1 EP 2473358B1
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EP
European Patent Office
Prior art keywords
layer
multilayer sheet
additional coating
locally restricted
printing
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EP10745221.1A
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German (de)
French (fr)
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EP2473358A1 (en
Inventor
Stefan Füllgraf
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ContiTech Elastomer Beschichtungen GmbH
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ContiTech Elastomer Beschichtungen GmbH
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Publication of EP2473358A1 publication Critical patent/EP2473358A1/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
    • 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
    • B41N2210/02—Top layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N2210/00—Location or type of the layers in multi-layer blankets or like coverings
    • B41N2210/14—Location or type of the layers in multi-layer blankets or like coverings characterised by macromolecular organic compounds

Definitions

  • the invention relates to a multilayer sheet in the form of a blanket with a printing layer of a polymeric material, at least one compressible layer and at least one reinforcing layer, wherein the individual layers form an adhesive bond with each other.
  • the invention further relates to a process for its preparation.
  • Modern printing presses transfer the printing ink from a printing cylinder to sheets or webs of the printing material.
  • the transfer takes place, for example, in offset printing on a blanket, which applies the color by pressing from the printing plate on the blanket on the medium to be printed.
  • the ink is transferred to the blanket via the color-friendly areas of the printing plate. In the water-bearing areas of the printing plate no color transfer takes place.
  • a multilayer sheet in the form of a blanket with a printing layer of a polymeric material, at least one compressible layer and at least one strength support layer, wherein the individual layers together form an adhesive bond is provided, which is characterized in that Printing layer is provided locally limited at least at one point of the print layer with an additional coating which completely prevents a color transfer at this localized location, wherein the additional coating of at least one resin and / or at least one paint and / or at least one polymer is constructed.
  • Essential to the invention is that the additional coating on the surface of the print layer of the blanket is locally limited and under no circumstances completely covered, otherwise no color is transmitted, which may not be in the context of the present invention.
  • the invention can also be used to fulfill customer wishes, even if they do not require color transfer at locations which are subject to little or no mechanical stress. In this case, it is also possible to dispense with the use of printing plates and to control the ink transfer to the printing medium only via the additional locally limited coating of the blanket.
  • the multilayer sheet is used in offset printing, preferably in waterless offset printing.
  • the additional locally limited coating consists of at least one resin or at least one lacquer, for example based on polyurethanes and / or polyisocyanates, or at least one polymer. It is also conceivable to use combinations of the materials mentioned.
  • the additional locally limited coating consists of at least one polymer.
  • silicone polymers and / or fluoropolymer has proved to be expedient, usable without a spill or even in a blend.
  • any of those skilled in the art known silicone polymers can be used individually or in combination, ie at least two-component, such as MQ (methyl silicone rubber), MFQ (methyl silicone rubber with Fluoro groups, also referred to as FMQ), MPQ (methyl silicone rubber with phenyl groups, also referred to as PMQ), MVQ (methyl silicone rubber with vinyl groups, also referred to as VMQ), MPVQ (methyl silicone rubber) Rubber with phenyl and vinyl groups, also referred to as PVMQ), nitrile silicone rubber or fluorosilicone.
  • MQ methyl silicone rubber
  • FMQ methyl silicone rubber with Fluoro groups
  • MPQ methyl silicone rubber with phenyl groups
  • PMQ methyl silicone rubber with phenyl groups
  • MVQ methyl silicone rubber with vinyl groups
  • MPVQ methyl silicone rubber
  • Rubber with phenyl and vinyl groups also referred to as PVMQ
  • nitrile silicone rubber or fluorosilicone nitrile silicone rubber or fluor
  • any of fluorine polymers known to those skilled in the art may be used singly or in combination, such as polytetrafluoroethylene (PTFE), modified polytetrafluoroethylene (TFM), fluoroethylene polymer (FEP), perfluoroalkyl vinyl ether tetraethylene copolymer (PFA), ethylene tetrafluoroethylene copolymer (ETFE ), Polyvinyl fluoride (PVF), polyvinylidene fluoride (PVDF) or ultra-high molecular weight polyethylene (UHMWPE), with polytetrafluoroethylene (PTFE) or modified polytetrafluoroethylene (TFM) being particularly preferred.
  • PTFE polytetrafluoroethylene
  • TMF fluoroethylene polymer
  • FEP fluoroethylene polymer
  • PFA perfluoroalkyl vinyl ether tetraethylene copolymer
  • ETFE ethylene tetrafluoroethylene copolymer
  • PVDF polyvin
  • the additional localized coating can also be a polymeric coating based on polyvinyl chloride (PVC), based on synthetic or natural polyisoprene or based on polyurethanes (PU).
  • PVC polyvinyl chloride
  • PU polyurethanes
  • the additional locally limited coating penetrates into the printing layer directly underneath, wherein preferably the penetration depth is at most 1/5, particularly preferably at most 1/10, of the thickness of the printing layer.
  • a textile structure for example a woven fabric, or a film, for example a polymer film (eg polyamide film) or metal foil, can be used.
  • a fabric having many layers and at least two reinforcement layers it is also possible to implement a combination of a textile structure and a film or a film composite. So in the patent EP 0 844 100 B1 a six-layer sheet with three fabric layers and a film layer (polymer film or metal foil) is described.
  • At least one strength support layer of at least one metal or a metal-plastic composite also referred to as metal laminate or metal-based laminate. This applies in particular to multilayer fabrics which have more than one reinforcement layer.
  • reinforcement layer it is advantageously composed of at least one metal or a metal-plastic composite, also referred to as metal laminate or metal-based laminate.
  • metal-based for example, as a metal-based blanket
  • MBB MetalBack Blanket
  • the lowest strength support layer is metal-based.
  • the metal may also use any known metal and its alloys or at least one metal-based composite. However, it is expedient to use iron or steel, in particular stainless steel, aluminum or an aluminum compound.
  • the present invention when using a so-called metal-based multi-layered sheet, has a further advantage such that the additional locally limited coating provides improved abrasion resistance when applied to the further layers at the transition points from the metal-based strengthening support layer having a protrusion.
  • part of the additional localized coating in this case is on the print layer, one part at the edges of the further layers and one part on the surface of the supernatant of the metal-based reinforcement.
  • transition points are usually the positions at which the blanket is clamped directly into the printing cylinder.
  • it is not only by cracking of the blanket or by cracking of the printing plate alone to an undesirable color transfer, but reinforced by mechanical abrasion of the print layer of the blanket and possibly also the underlying layers.
  • a locally limited Coating of the blanket in this critical area therefore allows a higher mileage of the blanket.
  • the printing presses are equipped with an automatic over pressure controlled washing device, so that a coating also enables a better cleaning behavior, in that the remaining clamping channel of the blanket cylinder can be cleaned more easily by the additional locally limited coating, which in turn leads to lower dynamic forces the rubber edge leads to the blanket.
  • the polymeric material of the print layer is a vulcanizate.
  • Vulcanizate is the name for products or product components produced by vulcanization of a vulcanizable polymer mixture - here the printing layer.
  • the polymer mixture contains one or more rubber component (s).
  • a vulcanizate is characterized by elastic properties.
  • crosslinking is by means of sulfur (e.g., NR) or peroxides (e.g., EPDM).
  • NR sulfur
  • EPDM peroxides
  • thermal vulcanization at temperatures of 130 to 200 ° C. Cold vulcanization or radiation vulcanization can also be used.
  • the aforementioned types of rubber may be unblended. It is also possible to use a blend, in particular in combination with one of the abovementioned types of rubber, for example an NR / BR blend or a BR / SBR blend.
  • EPM EPM
  • EPDM SBR
  • BR CR
  • NR HNBR
  • NBR NBR
  • the usual compounding ingredients include at least one crosslinker or crosslinker system (crosslinker and accelerator).
  • Other mixing ingredients are usually still a filler and / or a processing aid and / or a plasticizer and / or an aging inhibitor and optionally further additives (eg color pigments).
  • crosslinker and accelerator crosslinker and accelerator
  • Other mixing ingredients are usually still a filler and / or a processing aid and / or a plasticizer and / or an aging inhibitor and optionally further additives (eg color pigments).
  • the vulcanizate is a thermoplastic vulcanizate containing at least one thermoplastic component, at least one rubber component which is at least partially cross-linked, and compounding ingredients.
  • thermoplastic components are polyethylene (PE), polypropylene (PP), polystyrene, polyamide (PA) or polyester (PES).
  • Particularly suitable rubber components are EPM, EPDM, SBR, BR, CR, NR, HNBR or NBR, in particular in a blend-free embodiment.
  • Variant A has proved to be particularly advantageous.
  • a further object of the present invention is to provide a method for producing a multi-layer sheet in the form of a blanket, whereby the blanket obtains a good crack resistance at the mechanically stressed areas of the printing layer, in particular due to the clamping and no additional unwanted Color transfer takes place. Furthermore, the method is intended to provide a multi-layered sheet-like structure in the form of a printing blanket which prevents ink transfer from the printing plate to the blanket at the locations where the printing plate is damaged.
  • This object is achieved by a method for producing a multilayer sheet in the form of a printing blanket with a printing layer of a polymeric material, at least one compressible layer and at least one reinforcing layer, wherein the individual layers together an adhesive bond which is characterized in that a locally limited additional coating is applied to the print layer of a multilayer sheet and then the locally limited additional coating is dried.
  • the additional locally limited coating applied in the context of the method according to the invention is preferably a coating of at least one silicone polymer and / or at least one fluoropolymer.
  • the additional locally limited coating penetrates into the printing layer directly underneath.
  • further materials for the additional locally limited coating and their penetration depth reference is made at this point to the above statements.
  • At least one strength support layer of the multilayer sheet is a metal or a metal-plastic composite, i. if it is a metal-based blanket, as already described above.
  • the application of the additional locally limited coating is expediently carried out by brushing or spraying.
  • all conceivable tools such as brush, squeegee, plasma, etc., can be used.
  • the drying is preferably carried out at room temperature in air until complete drying, wherein the drying time of course depends on the composition of the additional locally limited coating.
  • drying cabinets and autoclaves can also be used, for example, drying cabinets and autoclaves.
  • the printing layer consists of a vulcanizable polymeric material, that this is already completely or partially vulcanized before applying the additional locally limited coating.
  • the lowest reinforcement layer 6 has a projection, which is advantageous when clamping the fabric onto a pressure roller.
  • an additional locally limited coating 19 for example of a two-component silicone rubber.
  • Fig. 2 shows a three-layer sheet 8 in the form of a blanket with a printing layer 9, for example, a vulcanizate, for example based on EPDM, wherein the printing layer rests directly on a compressible layer 10.
  • This compressible layer then in turn has direct contact with a reinforcement layer 11, for example of a fabric or metal.
  • a reinforcement layer for example of a fabric or metal.
  • Directly resting on the printing layer 9 is an additional locally limited coating 12, for example of a polymer.
  • the first reinforcement layer of a fabric and the second reinforcement layer of a film for example of a polymer film (eg polyamide film) or a metal foil, or a film composite, for example in the form of a polyamide pad.
  • Foil composite exist.
  • an additional locally limited coating 19 for example of a two-component silicone rubber.
  • the lowest reinforcement layer 6 has a projection, which is advantageous when clamping the fabric onto a pressure roller.
  • the lowermost strength carrier layer 6 has a protective film 26, which serves as corrosion protection for the printing cylinder.
  • the protective film 26 may completely or partially cover the underside of the lowermost strength support layer, which has no contact with the further layers of the fabric.
  • an additional locally limited coating 19 for example made of Teflon.
  • Another additional localized coating 19 of a same or different material is located on the transition zone between print layer 21 and bottom most reinforcing layer 26.
  • Additional recesses or depressions in the print layer 21 and / or the protective film 26 as shown in U.S. Pat Fig. 4 are to be seen, are advantageous because they lead to the loss of pressure or for reducing the pressure at this point and support the positive effects of the present invention.
  • the recesses and / or cuts can be done mechanically, for example by scribing, cutting, pressure, or chemically, for example by etching, or else by irradiation done.
  • Part of the additional localized coating 19 is partially no longer in direct contact with the print layer 21 as a result of the described recesses and / or cuts. However, it is also possible that only the thickness of the print layer 21 is reduced by the recesses and / or cuts , for example by pressure. In this case, the additional locally limited coating 19 again has complete contact with the print layer 21 at this point.
  • Figure 5 schematically shows the ink transfer by means of printing plates 28 and blanket 29.
  • the printing plates 28 and the blankets 29 are each applied to a printing cylinder 30, 31.
  • the printing plate applies the ink to the blanket, which in turn emits the ink onto the medium 32 to be printed.
  • the difference between printing plate and blanket should be clarified once again.
  • Multilayer flat structure (blanket) 2 print layer 3 first compressible layer 4 second compressible layer 5 first reinforcement layer 6 second reinforcement layer (metal) 7 locally limited coating 8th Multilayer sheet (printing blanket) 9 print layer 10 compressible layer 11 Strengthening support layer 12 locally limited coating 13 Multilayer sheet (printing blanket) 14 print layer 15 first compressible layer 16 second compressible layer 17 first reinforcement layer 18 second reinforcement layer 19 locally limited coating 20 Multilayer sheet (printing blanket) 21 print layer 22 first compressible layer 23 second compressible layer 24 first reinforcement layer 25 second reinforcement layer (metal) 26 Protective film for second reinforcement layer 27 locally limited coating 28 printing plate 29 blanket 30 Printing cylinder of the blanket 31 Printing cylinder of the printing plate 32 to be printed medium

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  • Printing Plates And Materials Therefor (AREA)
  • Laminated Bodies (AREA)

Description

Die Erfindung betrifft ein mehrschichtiges Flächengebilde in Form eines Drucktuches mit einer Druckschicht aus einem polymeren Werkstoff, wenigstens einer kompressiblen Schicht und wenigstens einer Festigkeitsträgerschicht, wobei die einzelnen Schichten untereinander einen Haftverbund bilden. Die Erfindung betrifft ferner ein Verfahren zu dessen Herstellung.The invention relates to a multilayer sheet in the form of a blanket with a printing layer of a polymeric material, at least one compressible layer and at least one reinforcing layer, wherein the individual layers form an adhesive bond with each other. The invention further relates to a process for its preparation.

Mehrschichtige Flächengebilde, insbesondere Drucktücher, sind im Stand der Technik unter anderem aus folgenden Druckschriften bekannt:

  • D1: DE 200 07 227 U1
  • D2: DE 689 19 783 T2
  • D3: DE 10 2004 023 316 A1
  • D4: EP 1 504 921 A2
  • D5: WO 91/11330 A1
Multilayer fabrics, in particular blankets, are known in the prior art inter alia from the following publications:
  • D1: DE 200 07 227 U1
  • D2: DE 689 19 783 T2
  • D3: DE 10 2004 023 316 A1
  • D4: EP 1 504 921 A2
  • D5: WO 91/11330 A1

Moderne Druckmaschinen übertragen die Druckfarbe von einem Druckzylinder auf Bögen oder Bahnen des Bedruckstoffes. Die Übertragung findet dabei beispielsweise im Offsetdruck über ein Drucktuch statt, das die Farbe durch Pressung von der Druckplatte über das Drucktuch auf das zu bedruckende Medium aufträgt. Die Farbe wird über die farbfreundlichen Bereiche der Druckplatte auf das Drucktuch übertragen. In den wasserführenden Bereichen der Druckplatte findet keine Farbübertragung statt.Modern printing presses transfer the printing ink from a printing cylinder to sheets or webs of the printing material. The transfer takes place, for example, in offset printing on a blanket, which applies the color by pressing from the printing plate on the blanket on the medium to be printed. The ink is transferred to the blanket via the color-friendly areas of the printing plate. In the water-bearing areas of the printing plate no color transfer takes place.

Um die Druckplatte in einer modernen Druckmaschine zu befestigen, muss diese im Einspannbereich gebogen werden. Durch das Biegen, insbesondere bei Druckplatten, die mit einer Beschichtung versehen sind, kommt es zu einer Beschädigung der sich an der Oberfläche befindlichen Beschichtung, was in diesem Bereich zu einer ungewollten Farbübertragung von der Druckplatte auf das Drucktuch führt. Durch die sich bildenden Risse zeichnet sich letztendlich die Farbe auf dem Bedruckstoff ab. Des Weiteren kommt es zu einem Farbaufhau auf der Druckschicht, was zu einer Zerstörung der Druckschicht oder des gesamten Drucktuches und / oder der gesamten Druckplatte führen kann. Besonders kritisch ist dieser Effekt im wasserlosen Offsetdruck, bei dem die Druckschicht vollständig, d.h. flächendeckend, beschichtet ist. Es kommt in diesem Fall zu einer Schädigung der Beschichtung, die immer weiter zunimmt und sich ausbreitet und massive Ausdruckprobleme mit sich bringt.In order to fix the printing plate in a modern printing press, it must be bent in the clamping area. By bending, especially with printing plates, which are provided with a coating, it comes to a damage to the Surface coating, resulting in this area to an unwanted color transfer from the printing plate on the blanket. Due to the cracks forming, the color on the printing material finally becomes apparent. Furthermore, there is a buildup of color on the print layer, which can lead to a destruction of the print layer or the entire blanket and / or the entire printing plate. This effect is particularly critical in waterless offset printing, in which the printing layer is completely coated, ie covering the whole area. In this case, damage to the coating occurs, which continues to increase and spread, causing massive expression problems.

Es ist daher die Aufgabe der vorliegenden Erfindung, ein mehrschichtiges Flächengebilde in Form eines Drucktuches bereitzustellen, dass sich durch eine gute Rissbeständigkeit an den insbesondere durch das Einspannen des Drucktuches verursachten mechanisch stark beanspruchten Stellen der Druckschicht auszeichnet, wodurch an diesen Stellen kein zusätzlicher unerwünschter Farbübertrag stattfindet. Des Weiteren soll das mehrschichtige Flächengebilde in Form eines Drucktuches gewährleisten, dass kein Farbübertrag von der Druckplatte auf das Drucktuch an den Stellen, an denen die Druckplatte beschädigt ist, stattfindet und somit die oben genannten Probleme gelöst werden.It is therefore an object of the present invention to provide a multilayer sheet in the form of a blanket that is characterized by a good resistance to cracking caused in particular by the clamping of the blanket mechanically heavily stressed areas of the print layer, which takes place at these locations no additional undesirable color transfer , Furthermore, the multi-layered sheet-like fabric is intended to ensure that no ink transfer from the printing plate to the blanket occurs at the locations where the printing plate is damaged, thus solving the above problems.

Gelöst wird diese Aufgabe dadurch, dass ein mehrschichtiges Flächengebilde in Form eines Drucktuches mit einer Druckschicht aus einem polymeren Werkstoff, wenigstens einer kompressiblen Schicht und wenigstens einer Festigkeitsträgerschicht, wobei die einzelnen Schichten untereinander einen Haftverbund bilden, bereitgestellt wird, welches sich dadurch auszeichnet, dass die Druckschicht an wenigstens einer Stelle der Druckschicht lokal begrenzt mit einer zusätzlichen Beschichtung versehen ist, die einen Farbübertrag an dieser lokal begrenzten Stelle vollständig verhindert, wobei die zusätzliche Beschichtung aus wenigstens einem Harz und / oder wenigstens einem Lack und / oder wenigstens einem Polymer aufgebaut ist.This object is achieved in that a multilayer sheet in the form of a blanket with a printing layer of a polymeric material, at least one compressible layer and at least one strength support layer, wherein the individual layers together form an adhesive bond, is provided, which is characterized in that Printing layer is provided locally limited at least at one point of the print layer with an additional coating which completely prevents a color transfer at this localized location, wherein the additional coating of at least one resin and / or at least one paint and / or at least one polymer is constructed.

Überraschenderweise hat sich gezeigt, dass ein derartige zusätzliche Beschichtung auf einem mehrschichtigen Flächengebilde in Form eines Drucktuches die Rissbildung an den mechanisch stark beanspruchten Stellen verhindern bzw. deutlich reduzieren kann, so dass kein unerwünschter Farbübertrag stattfindet. Ebenso wird ein Farbübertrag von der Druckplatte auf das Drucktuch an den beschädigten Stellen der Druckplatte verhindert. Es findet somit kein Farbübertrag von der Druckplatte auf das Drucktuch und dadurch auch kein Farbübertrag von dem Drucktuch auf das zu bedruckende Medium statt.Surprisingly, it has been found that such an additional coating on a multi-layered fabric in the form of a blanket, the cracking of the Prevent mechanically strong stressed areas or can significantly reduce, so that no unwanted color transfer takes place. Likewise, a transfer of ink from the printing plate is prevented on the blanket at the damaged areas of the printing plate. There is thus no ink transfer from the printing plate to the blanket and thus no ink transfer from the blanket to the medium to be printed instead.

Erfindungswesentlich ist, dass die zusätzliche Beschichtung auf der Oberfläche der Druckschicht des Drucktuches lokal begrenzt ist und diese auf keinen Fall vollständig bedeckt, da sonst gar keine Farbe übertragen wird, was nicht im Sinne der vorliegenden Erfindung sein kann.Essential to the invention is that the additional coating on the surface of the print layer of the blanket is locally limited and under no circumstances completely covered, otherwise no color is transmitted, which may not be in the context of the present invention.

Die Erfindung kann auch zur Erfüllung von Kundenwünschen herangezogen werden, wenn diese auch an Stellen, die keiner oder nur sehr geringer mechanischer Beanspruchung unterliegen, keinen Farbübertrag wünschen. In diesem Fall ist es auch möglich, auf den Einsatz von Druckplatten zu verzichten und den Farbübertrag auf das Druckmedium lediglich über die zusätzliche lokal begrenzte Beschichtung des Drucktuches zu steuern.The invention can also be used to fulfill customer wishes, even if they do not require color transfer at locations which are subject to little or no mechanical stress. In this case, it is also possible to dispense with the use of printing plates and to control the ink transfer to the printing medium only via the additional locally limited coating of the blanket.

Vorteilhafterweise findet das mehrschichtige Flächengebilde im Offsetdruck Verwendung, bevorzugt im wasserlosen Offsetdruck.Advantageously, the multilayer sheet is used in offset printing, preferably in waterless offset printing.

Die zusätzliche lokal begrenzte Beschichtung besteht aus wenigstens einem Harz oder wenigstens einem Lack, beispielsweise auf Basis von Polyurethanen und / oder Polyisocyanaten, oder wenigstens einem Polymer. Es ist auch vorstellbar Kombinationen der genannten Materialien einzusetzen.The additional locally limited coating consists of at least one resin or at least one lacquer, for example based on polyurethanes and / or polyisocyanates, or at least one polymer. It is also conceivable to use combinations of the materials mentioned.

Vorteilhafterweise besteht die zusätzliche lokal begrenzte Beschichtung aus wenigstens einem Polymer. Als zweckmäßig hat sich der Einsatz von Silikonpolymere und / oder Fluorpolymer erwiesen, verwendbar verschnittfrei oder auch im Verschnitt.Advantageously, the additional locally limited coating consists of at least one polymer. The use of silicone polymers and / or fluoropolymer has proved to be expedient, usable without a spill or even in a blend.

Als Silikonpolymer können alle der fachkundigen Person bekannten Silikonpolymere einzeln oder in Kombination, d.h. mindestens zweikomponentig, verwendet werden, wie beispielsweise MQ (Methyl-Silikon-Kautschuk), MFQ (Methyl-Silikon-Kautschuk mit Fluor-Gruppen, auch als FMQ bezeichnet), MPQ (Methyl-Silikon-Kautschuk mit PhenylGruppen, auch als PMQ bezeichnet), MVQ (Methyl-Silikon-Kautschuk mit Vinyl-Gruppen, auch als VMQ bezeichnet), MPVQ (Methyl-Silikon-Kautschuk mit Phenyl- und Vinyl-Gruppen, auch als PVMQ bezeichnet), Nitril-Silikonkautschuk oder Fluorsilikon.As the silicone polymer, any of those skilled in the art known silicone polymers can be used individually or in combination, ie at least two-component, such as MQ (methyl silicone rubber), MFQ (methyl silicone rubber with Fluoro groups, also referred to as FMQ), MPQ (methyl silicone rubber with phenyl groups, also referred to as PMQ), MVQ (methyl silicone rubber with vinyl groups, also referred to as VMQ), MPVQ (methyl silicone rubber) Rubber with phenyl and vinyl groups, also referred to as PVMQ), nitrile silicone rubber or fluorosilicone.

Als Fluorpolymer können alle der fachkundigen Person bekannten Fluorpolymere einzeln oder in Kombination verwendet werden, wie beispielsweise Polytetrafluorethylen (PTFE), modifiziertem Polytetrafluorethylen (TFM), Fluorethylenpolymer (FEP), Perfluoralkylvinylether-Tetraethylen-Copolymer (PFA), Ethylen-Tetrafluorethylen-Copolymer (ETFE), Polyvinylfluorid (PVF), Polyvinylidenflourid (PVDF) oder ultrahochmolekulares Polyethylen (UHMWPE), wobei Polytetrafluorethylen (PTFE) oder modifiziertes Polytetrafluorethylen (TFM) besonders bevorzugt sind.As the fluoropolymer, any of fluorine polymers known to those skilled in the art may be used singly or in combination, such as polytetrafluoroethylene (PTFE), modified polytetrafluoroethylene (TFM), fluoroethylene polymer (FEP), perfluoroalkyl vinyl ether tetraethylene copolymer (PFA), ethylene tetrafluoroethylene copolymer (ETFE ), Polyvinyl fluoride (PVF), polyvinylidene fluoride (PVDF) or ultra-high molecular weight polyethylene (UHMWPE), with polytetrafluoroethylene (PTFE) or modified polytetrafluoroethylene (TFM) being particularly preferred.

Eine Kombination von Silikonpolymer und Fluorpolymer ist möglich.A combination of silicone polymer and fluoropolymer is possible.

Bei der zusätzlichen lokal begrenzten Beschichtung kann es sich allerdings auch um eine polymere Beschichtung auf der Basis von Polyvinylchlorid (PVC), auf der Basis von synthetischem oder natürlichem Polyisopren oder auf der Basis von Polyurethanen (PU) handeln.However, the additional localized coating can also be a polymeric coating based on polyvinyl chloride (PVC), based on synthetic or natural polyisoprene or based on polyurethanes (PU).

Vorteilhafterweise dringt die zusätzliche lokal begrenzte Beschichtung in die sich direkt darunter befindende Druckschicht ein, wobei vorzugsweise die Eindringtiefe maximal 1/5, besonders bevorzugt maximal 1/10, der Dicke der Druckschicht beträgt.Advantageously, the additional locally limited coating penetrates into the printing layer directly underneath, wherein preferably the penetration depth is at most 1/5, particularly preferably at most 1/10, of the thickness of the printing layer.

Als Festigkeitsträgerschicht kann ein Textilgebilde, beispielsweise ein Gewebe, oder eine Folie, beispielsweise eine Polymerfolie (z.B. Polyamidfolie) oder Metallfolie, zur Anwendung gelangen. Bei einem Flächengebilde mit vielen Schichten und wenigstens zwei Festigkeitsträgerschichten kann auch eine Kombination von einem Textilgebilde und einer Folie oder eines Folienverbundes umgesetzt werden. So wird in der Patentschrift EP 0 844 100 B1 ein sechsschichtiges Flächengebilde mit drei Gewebeschichten und einer Folienschicht (Polymerfolie oder Metallfolie) beschrieben.As a reinforcement layer, a textile structure, for example a woven fabric, or a film, for example a polymer film (eg polyamide film) or metal foil, can be used. In the case of a fabric having many layers and at least two reinforcement layers, it is also possible to implement a combination of a textile structure and a film or a film composite. So in the patent EP 0 844 100 B1 a six-layer sheet with three fabric layers and a film layer (polymer film or metal foil) is described.

Die genannten Vorteile zeigen sich insbesondere, wenn wenigstens eine Festigkeitsträgerschicht aus wenigstens einem Metall oder einem Metall-Kunstoffverbund, auch als Metall-Laminat oder metallbasierendes Laminat bezeichnet, basiert. Dies gilt insbesondere bei mehrschichtigen Flächengebilden, die mehr als eine Festigkeitsträgerlage aufweisen.The advantages mentioned are particularly evident if at least one strength support layer of at least one metal or a metal-plastic composite, also referred to as metal laminate or metal-based laminate. This applies in particular to multilayer fabrics which have more than one reinforcement layer.

Existiert nur eine Festigkeitsträgerlage, so ist diese vorteilhafterweise aus wenigstens einem Metall oder einem Metall-Kunstoffverbund, auch als Metall-Laminat oder metallbasierendes Laminat bezeichnet, bestehend.If only one reinforcement layer exists, it is advantageously composed of at least one metal or a metal-plastic composite, also referred to as metal laminate or metal-based laminate.

In der Fachwelt wird dies häufig ganz allgemein auch als metallbasierend bezeichnet, beispielsweise als metallbasierendes Drucktuch, in der englischsprachigen Fachwelt ist dies auch als MBB (MetalBack Blanket) bekannt.In the art, this is often referred to as metal-based, for example, as a metal-based blanket, in the English-speaking world this is also known as MBB (MetalBack Blanket).

Bevorzugt ist jeweils die unterste Festigkeitsträgerschicht metallbasierend.Preferably, in each case the lowest strength support layer is metal-based.

Bei dem Metall können auch alle bekannten Metall und deren Legierungen oder auf wenigstens einem Metall basierende Verbundwerkstoffe verwendet werden. Zweckmäßig ist allerdings der Einsatz von Eisen oder Stahl, insbesondere Edelstahl, Aluminium oder einer Aluminiumverbindung.The metal may also use any known metal and its alloys or at least one metal-based composite. However, it is expedient to use iron or steel, in particular stainless steel, aluminum or an aluminum compound.

Die vorliegende Erfindung zeigt bei Verwendung eines so genannten metallbasierenden mehrschichtigen Flächengebildes einen weiteren Vorteil derart, dass die zusätzliche lokal begrenzte Beschichtung eine verbesserte Abriebbeständigkeit gewährleistet, wenn sie an den Übergangstellen von der metallbasierenden Festigkeitsträgerschicht, die einen Überstand besitzt, zu den weiteren Schichten aufgebracht wird. Dies bedeutet, dass ein Teil der zusätzlichen lokal begrenzten Beschichtung sich in diesem Fall auf der Druckschicht befindet, ein Teil an den Rändern der weiteren Schichten und ein Teil auf der Oberfläche des Überstandes des metallbasierenden Festigkeitsträgers.The present invention, when using a so-called metal-based multi-layered sheet, has a further advantage such that the additional locally limited coating provides improved abrasion resistance when applied to the further layers at the transition points from the metal-based strengthening support layer having a protrusion. This means that part of the additional localized coating in this case is on the print layer, one part at the edges of the further layers and one part on the surface of the supernatant of the metal-based reinforcement.

Diese Übergangstellen sind in der Regel die Positionen, an denen das Drucktuch in den Druckzylinder direkt eingespannt wird. Hier kommt es nicht nur durch Rissbildung des Drucktuches oder durch Rissbildung der Druckplatte alleine zu einem unerwünschten Farbübertrag, sondern verstärkt durch mechanischen Abrieb der Druckschicht des Drucktuches und eventuell auch der darunter liegenden Schichten. Eine lokal begrenzte Beschichtung des Drucktuches in diesem kritischen Bereich ermöglicht daher eine höhere Laufleistung des Drucktuches.These transition points are usually the positions at which the blanket is clamped directly into the printing cylinder. Here, it is not only by cracking of the blanket or by cracking of the printing plate alone to an undesirable color transfer, but reinforced by mechanical abrasion of the print layer of the blanket and possibly also the underlying layers. A locally limited Coating of the blanket in this critical area therefore allows a higher mileage of the blanket.

In dem meisten Fällen sind die Druckmaschinen mit einer automatischen über andruckgesteuerten Wascheinrichtung ausgerüstet, so dass eine Beschichtung auch ein besseres Reinigungsverhalten ermöglicht, dadurch, dass sich der verbleibende Einspannkanal des Drucktuchzylinders durch die zusätzliche lokal begrenzte Beschichtung einfacher reinigen lässt, was wiederum zu geringeren dynamischen Kräften der Gummikante am Drucktuch führt.In most cases, the printing presses are equipped with an automatic over pressure controlled washing device, so that a coating also enables a better cleaning behavior, in that the remaining clamping channel of the blanket cylinder can be cleaned more easily by the additional locally limited coating, which in turn leads to lower dynamic forces the rubber edge leads to the blanket.

Es hat sich weiterhin als vorteilhaft gezeigt, wenn der polymere Werkstoff der Druckschicht ein Vulkanisat ist.It has also been shown to be advantageous if the polymeric material of the print layer is a vulcanizate.

Vulkanisat ist die Bezeichnung für durch Vulkanisation einer vulkanisierbaren Polymermischung hergestellte Produkte oder Produktbauteile - hier die Druckschicht. Dabei enthält die Polymermischung eine oder mehrere Kautschukkomponente/n. Ein Vulkanisat zeichnet sich durch elastische Eigenschaften aus. Je nach dem eingesetzten Kautschuktyp erfolgt die Vernetzung mittels Schwefel (z.B. bei NR) oder Peroxiden (z.B. bei EPDM). Von besonderer Bedeutung ist die thermische Vulkanisation bei Temperaturen von 130 bis 200 °C. Auch die Kaltwlkanisation oder die Strahlenvulkanisation kann angewandt werden.Vulcanizate is the name for products or product components produced by vulcanization of a vulcanizable polymer mixture - here the printing layer. In this case, the polymer mixture contains one or more rubber component (s). A vulcanizate is characterized by elastic properties. Depending on the type of rubber used, crosslinking is by means of sulfur (e.g., NR) or peroxides (e.g., EPDM). Of particular importance is the thermal vulcanization at temperatures of 130 to 200 ° C. Cold vulcanization or radiation vulcanization can also be used.

Hinsichtlich des Vulkanisates kommen insbesondere folgende beiden Varianten zur Anwendung:With regard to the vulcanizate, the following two variants are used in particular:

Variante Aoption A

Das Vulkanisat ist eine vulkanisierte thermoplastfreie Kautschukmischung, enthaltend wenigstens eine Kautschukkomponente sowie Mischungsingredienzien. Als Kautschukkomponenten, aber nicht beschränkt auf diese, sind insbesondere zu nennen:

  • Ethylen-Propylen-Kautschuk (EPM)
  • Ethylen-Propylen-Dien-Kautschuk (EPDM)
  • Nitrilkautschuk (NBR)
  • (teil)hydrierter Nitrilkautschuk (HNBR)
  • Fluor-Kautschuk (FKM)
  • Chloropren-Kautschuk (CR)
  • Naturkautschuk (NR)
  • Styrol-Butadien-Kautschuk (SBR)
  • Isopren-Kautschuk (IR)
  • Butylkautschuk (IIR)
  • Brombutylkautschuk (BIIR)
  • Chlorbutylkautschuk (CIIR)
  • Butadien-Kautschuk (BR)
  • Chloriertes Polyethylen (CM)
  • Chlorsulfoniertes Polyethylen (CSM)
  • Polyepichlorhydrin (ECO)
  • Ethylen-Vinylacetat-Kautschuk (EVA)
  • Acrylat-Kautschuk (ACM)
  • Ethylen-Acrylat-Kautschuk (AEM)
The vulcanizate is a vulcanized thermoplastic-free rubber mixture containing at least one rubber component and mixing ingredients. As rubber components, but not limited to these, are to be mentioned in particular:
  • Ethylene-propylene rubber (EPM)
  • Ethylene-propylene-diene rubber (EPDM)
  • Nitrile rubber (NBR)
  • (partially) hydrogenated nitrile rubber (HNBR)
  • Fluoro rubber (FKM)
  • Chloroprene rubber (CR)
  • Natural rubber (NR)
  • Styrene butadiene rubber (SBR)
  • Isoprene rubber (IR)
  • Butyl rubber (IIR)
  • Bromobutyl rubber (BIIR)
  • Chlorobutyl rubber (CIIR)
  • Butadiene rubber (BR)
  • Chlorinated polyethylene (CM)
  • Chlorosulfonated polyethylene (CSM)
  • Polyepichlorohydrin (ECO)
  • Ethylene-vinyl acetate rubber (EVA)
  • Acrylate rubber (ACM)
  • Ethylene acrylate rubber (AEM)

Die vorgenannten Kautschuktypen können unverschnitten sein. Auch der Einsatz eines Verschnittes, insbesondere in Verbindung mit einem der vorgenannten Kautschuktypen, beispielsweise ein NR/BR-Verschnitt oder ein BR/SBR-Verschnitt, ist möglich.The aforementioned types of rubber may be unblended. It is also possible to use a blend, in particular in combination with one of the abovementioned types of rubber, for example an NR / BR blend or a BR / SBR blend.

Von besonderer Bedeutung sind: EPM, EPDM, SBR, BR, CR, NR, HNBR oder NBR. Die üblichen Mischungsingredienzien umfassen wenigstens einen Vernetzer oder ein Vernetzersystem (Vernetzungsmittel und Beschleuniger). Weitere Mischungsingredienzien sind zumeist noch ein Füllstoff und/oder ein Verarbeitungshilfsmittel und/oder ein Weichmacher und/oder ein Alterungsschutzmittel sowie gegebenenfalls weitere Zusatzstoffe (z.B. Farbpigmente). Diesbezüglich wird auf den allgemeinen Stand der Kautschukmischungstechnologie verwiesen.Of particular importance are: EPM, EPDM, SBR, BR, CR, NR, HNBR or NBR. The usual compounding ingredients include at least one crosslinker or crosslinker system (crosslinker and accelerator). Other mixing ingredients are usually still a filler and / or a processing aid and / or a plasticizer and / or an aging inhibitor and optionally further additives (eg color pigments). In this regard, reference is made to the general state of rubber mixing technology.

Variante BVariant B

Das Vulkanisat ist ein thermoplastisches Vulkanisat, enthaltend wenigstens eine Thermoplastkomponente, wenigstens eine Kautschukkomponente, die zumindest teilvernetzt ist, sowie Mischungsingredienzien.The vulcanizate is a thermoplastic vulcanizate containing at least one thermoplastic component, at least one rubber component which is at least partially cross-linked, and compounding ingredients.

Die bevorzugten Thermoplastkomponenten sind Polyethylen (PE), Polypropylen (PP), Polystyrol, Polyamid (PA) oder Polyester (PES).The preferred thermoplastic components are polyethylene (PE), polypropylene (PP), polystyrene, polyamide (PA) or polyester (PES).

Als Kautschukkomponenten sind insbesondere EPM, EPDM, SBR, BR, CR, NR, HNBR oder NBR, insbesondere in verschnittfreier Ausführung, zu nennen.Particularly suitable rubber components are EPM, EPDM, SBR, BR, CR, NR, HNBR or NBR, in particular in a blend-free embodiment.

Hinsichtlich der Mischungsingredienzien wird auf die oben genannte Mischungstechnologie, insbesondere auf die Lehre gemäß der Offenlegungsschrift DE 100 04 632 A1 verwiesen.With regard to the mixture ingredients, reference is made to the above-mentioned mixture technology, in particular to the teaching according to the published patent application DE 100 04 632 A1 directed.

Die Variante A hat sich hierbei als besonders vorteilhaft erwiesen.Variant A has proved to be particularly advantageous.

Eine weitere Aufgabe der vorliegenden Erfindung ist es, ein Verfahren zur Herstellung eines mehrschichtigen Flächengebildes in Form eines Drucktuches bereitzustellen, wodurch das Drucktuch eine gute Rissbeständigkeit an den insbesondere durch das Einspannen verursachten mechanisch stark beanspruchten Stellen der Druckschicht erlangt und wodurch an diesen Stellen kein zusätzlicher unerwünschter Farbübertrag stattfindet. Des Weiteren soll durch das Verfahren ein mehrschichtiges Flächengebilde in Form eines Drucktuches bereitgestellt werden, dass einen Farbübertrag von der Druckplatte auf das Drucktuch an den Stellen, an denen die Druckplatte beschädigt ist, verhindert.A further object of the present invention is to provide a method for producing a multi-layer sheet in the form of a blanket, whereby the blanket obtains a good crack resistance at the mechanically stressed areas of the printing layer, in particular due to the clamping and no additional unwanted Color transfer takes place. Furthermore, the method is intended to provide a multi-layered sheet-like structure in the form of a printing blanket which prevents ink transfer from the printing plate to the blanket at the locations where the printing plate is damaged.

Gelöst wird diese Aufgabe ein Verfahren zur Herstellung eines mehrschichtigen Flächengebildes in Form eines Drucktuches mit einer Druckschicht aus einem polymeren Werkstoff, wenigstens einer kompressiblen Schicht und wenigstens einer Festigkeitsträgerschicht, wobei die einzelnen Schichten untereinander einen Haftverbund bilden, welches sich dadurch auszeichnet, dass eine lokal begrenzte zusätzliche Beschichtung auf die Druckschicht eines mehrschichtigen Flächengebildes aufgebracht wird und anschließend die lokal begrenzte zusätzliche Beschichtung getrocknet wird.This object is achieved by a method for producing a multilayer sheet in the form of a printing blanket with a printing layer of a polymeric material, at least one compressible layer and at least one reinforcing layer, wherein the individual layers together an adhesive bond which is characterized in that a locally limited additional coating is applied to the print layer of a multilayer sheet and then the locally limited additional coating is dried.

Bevorzugt handelt es sich bei der im Rahmen des erfindungsgemäßen Verfahrens aufgebrachten zusätzlichen lokal begrenzten Beschichtung um eine Beschichtung aus wenigstens einem Silikonpolymer und / oder wenigstens einem Fluorpolymer.The additional locally limited coating applied in the context of the method according to the invention is preferably a coating of at least one silicone polymer and / or at least one fluoropolymer.

Die zusätzliche lokal begrenzte Beschichtung dringt in die sich direkt darunter befindende Druckschicht ein. Bezüglich weiterer Materialien für die zusätzliche lokal begrenzte Beschichtung und deren Eindringtiefe wird an dieser Stelle auf obige Ausführungen verwiesen. Ebenso wird bezüglich des weiteren Aufbaus des mehrschichtigen Flächengebildes und der Materialien der einzelnen Schichten auf die bereits obig angegebenen Ausführungen verwiesen.The additional locally limited coating penetrates into the printing layer directly underneath. With regard to further materials for the additional locally limited coating and their penetration depth, reference is made at this point to the above statements. Likewise, with regard to the further construction of the multilayer sheet and the materials of the individual layers, reference is made to the statements already made above.

Im Rahmen des Verfahrens erscheint es vorteilhaft, wenn wenigstens eine Festigkeitsträgerschicht des mehrschichtigen Flächengebildes ein Metall oder ein Metall-Kunststoffverbund ist, d.h. wenn es sich um ein metallbasierendes Drucktuch, wie bereits oben beschrieben, handelt.In the context of the process, it appears advantageous if at least one strength support layer of the multilayer sheet is a metal or a metal-plastic composite, i. if it is a metal-based blanket, as already described above.

Das Aufbringen der zusätzlichen lokal begrenzten Beschichtung erfolgt zweckmäßig mittels Aufstreichen oder Aufsprühen. Hierzu können alle erdenklichen Hilfsmittel, wie beispielsweise Pinsel, Rakel, Plasma, etc., verwendet werden.The application of the additional locally limited coating is expediently carried out by brushing or spraying. For this purpose, all conceivable tools, such as brush, squeegee, plasma, etc., can be used.

Die Trocknung erfolgt bevorzugt bei Raumtemperatur an der Luft bis zur vollständigen Trocknung, wobei die Trockendauer selbstverständlich von der Zusammensetzung der zusätzlichen lokal begrenzten Beschichtung abhängig ist.The drying is preferably carried out at room temperature in air until complete drying, wherein the drying time of course depends on the composition of the additional locally limited coating.

Es können aber auch beispielsweise Trockenschränke und Autoklaven verwendet werden.But it can also be used, for example, drying cabinets and autoclaves.

Als vorteilhaft hat es sich erwiesen, wenn die Druckschicht aus einem vulkanisierbaren polymeren Werkstoff besteht, dass dieser vor Aufbringen der zusätzlichen lokal begrenzten Beschichtung bereits vollständig oder teilweise vulkanisiert ist.It has proven to be advantageous if the printing layer consists of a vulcanizable polymeric material, that this is already completely or partially vulcanized before applying the additional locally limited coating.

Die Erfindung wird nun anhand von Ausführungsbeispielen unter Bezugnahme auf schematische Zeichnungen erläutert. Es zeigen:

Fig. 1
einen Querschnitt eines fünfschichtigen Flächengebildes mit einer Druckschicht aus einem Vulkanisat und einer auf der Druckschicht aufgebrachten zusätzlichen lokal begrenzten Beschichtung und einer unterste Festigkeitsträgerschicht mit Überstand;
Fig. 2
einen Querschnitt eines dreischichtigen Flächengebildes mit einer Druckschicht aus einem Vulkanisat und einer auf der Druckschicht aufgebrachten zusätzlichen lokal begrenzten Beschichtung;
Fig. 3
einen Querschnitt eines fünfschichtigen Flächengebildes mit einer Druckschicht aus einem Vulkanisat und einer auf der Druckschicht aufgebrachten zusätzlichen lokal begrenzten Beschichtung;
Fig. 4
einen Querschnitt eines fünfschichtigen Flächengebildes mit einer Druckschicht aus einem Vulkanisat und einer unteren Festigkeitsträgerschicht mit Überstand und einer jeweils auf der Druckschicht und auf der Übergangszone zwischen Druckschicht und unterster Festigkeitsträgerschicht aufgebrachten zusätzlichen lokal begrenzten Beschichtung;
Fig. 5
schematische Darstellung einer Farbübertragung mittels Drucktuch und Druckplatte.
The invention will now be explained by means of exemplary embodiments with reference to schematic drawings. Show it:
Fig. 1
a cross-section of a five-layer sheet with a pressure layer of a Vulkanisat and an applied on the print layer additional localized coating and a lowermost strength support layer with supernatant;
Fig. 2
a cross section of a three-layer sheet with a pressure layer of a Vulkanisat and applied to the print layer additional locally limited coating;
Fig. 3
a cross-section of a five-layer sheet with a pressure layer of a vulcanizate and an applied on the print layer additional locally limited coating;
Fig. 4
a cross-section of a five-layer sheet having a pressure layer of a vulcanizate and a lower strength support layer with supernatant and an applied on the pressure layer and on the transition zone between the print layer and the lower strength support layer additional localized coating;
Fig. 5
schematic representation of a color transfer by means of blanket and printing plate.

Fig. 1 zeigt ein fünfschichtiges Flächengebilde 1 mit folgender Schichtenabfolge:

  • Druckschicht 2 beispielsweise aus einem Vulkanisat;
  • erste kompressible Schicht 3, beispielsweise in Form von expandierendem Material einer Gummimischung;
  • erste Festigkeitsträgerschicht 5, beispielsweise aus einem Gewebe;
  • zweite kompressible Schicht 4, beispielsweise wiederum in Form von Mikrokugeln aus Kunststoff in einer Gummimischung;
  • zweite Festigkeitsträgerschicht 6, beispielsweise aus Metall oder Metall-Kunststoffverbund.
Fig. 1 shows a five-layer sheet 1 with the following layer sequence:
  • Print layer 2, for example, from a vulcanizate;
  • first compressible layer 3, for example in the form of expanding material of a rubber compound;
  • first reinforcement layer 5, for example of a fabric;
  • second compressible layer 4, for example again in the form of plastic microspheres in a rubber compound;
  • second reinforcement layer 6, for example made of metal or metal-plastic composite.

Die zweite und gleichzeitig unterste Festigkeitsträgerschicht 6 besitzt einen Überstand, der vorteilhaft beim Einspannen des Flächengebildes auf eine Druckwalze ist. Direkt auf der Druckschicht 14 aufliegend befindet sich eine zusätzliche lokal begrenzte Beschichtung 19 beispielsweise aus einem zwei-komponentigen Silikonkautschuk.The second and at the same time the lowest reinforcement layer 6 has a projection, which is advantageous when clamping the fabric onto a pressure roller. Directly resting on the printing layer 14 is an additional locally limited coating 19, for example of a two-component silicone rubber.

Fig. 2 zeigt ein dreischichtiges Flächengebilde 8 in Form eines Drucktuches mit einer Druckschicht 9 beispielsweise aus einem Vulkanisat, beispielsweise auf der Basis von EPDM, wobei die Druckschicht direkt auf einer kompressiblen Schicht 10 aufliegt. Diese kompressible Schicht hat dann wiederum direkten Kontakt zu einer Festigkeitsträgerschicht 11, beispielsweise aus einem Gewebe oder Metall. Direkt auf der Druckschicht 9 aufliegend befindet sich eine zusätzliche lokal begrenzte Beschichtung 12 beispielsweise aus einem Polymer. Fig. 2 shows a three-layer sheet 8 in the form of a blanket with a printing layer 9, for example, a vulcanizate, for example based on EPDM, wherein the printing layer rests directly on a compressible layer 10. This compressible layer then in turn has direct contact with a reinforcement layer 11, for example of a fabric or metal. Directly resting on the printing layer 9 is an additional locally limited coating 12, for example of a polymer.

Fig. 3 zeigt ein fünfschichtiges Flächengebilde 13 mit folgender Schichtenabfolge:

  • Druckschicht 14 beispielsweise aus einem Vulkanisat;
  • erste kompressible Schicht 15, beispielsweise in Form von Mikrokugeln aus Kunststoff in einer Gummimischung;
  • erste Festigkeitsträgerschicht 17, beispielsweise aus einem Gewebe;
  • zweite kompressible Schicht 16, beispielsweise in Form von expandierendem Material einer Gummimischung;
  • zweite Festigkeitsträgerschicht 18, beispielsweise wiederum aus einem Gewebe oder Metall oder Metall-Kunststoffverbund.
Fig. 3 shows a five-layer sheet 13 with the following layer sequence:
  • Printing layer 14, for example, from a vulcanizate;
  • first compressible layer 15, for example in the form of plastic microspheres in a rubber compound;
  • first reinforcement layer 17, for example made of a fabric;
  • second compressible layer 16, for example in the form of expanding material of a rubber compound;
  • second reinforcement layer 18, for example, in turn made of a fabric or metal or metal-plastic composite.

Bei einem Flächengebilde gemäß Fig. 3 ist es möglich, mit unterschiedlichen Festigkeitsträgerschichten zu arbeiten, indem beispielsweise die erste Festigkeitsträgerschicht aus einem Gewebe und die zweite Festigkeitsträgerschicht aus einer Folie, beispielsweise aus einer Polymerfolie (z.B. Polyamidfolie) oder einer Metallfolie, oder einem Folienverbund, beispielsweise in Form eines Polyamid-Polester-Folienverbundes, bestehen.In a fabric according to Fig. 3 For example, it is possible to work with different reinforcement layers by, for example, the first reinforcement layer of a fabric and the second reinforcement layer of a film, for example of a polymer film (eg polyamide film) or a metal foil, or a film composite, for example in the form of a polyamide pad. Foil composite exist.

Direkt auf der Druckschicht 14 aufliegend befindet sich eine zusätzliche lokal begrenzte Beschichtung 19 beispielsweise aus einem zwei-komponentigen Silikonkautschuk.Directly resting on the printing layer 14 is an additional locally limited coating 19, for example of a two-component silicone rubber.

Fig. 4 zeigt ein fünfschichtiges Flächengebilde 20 mit folgender Schichtenabfolge:

  • Druckschicht 21 beispielsweise aus einem Vulkanisat;
  • erste kompressible Schicht 22;
  • erste Festigkeitsträgerschicht 24, beispielsweise aus einem Gewebe;
  • zweite kompressible Schicht 23, beispielsweise in Form von Mikrokugeln aus Kunststoff in einer Gummimischung oder geschäumter Kunstofffolie;
  • zweite Festigkeitsträgerschicht 25, beispielsweise aus Metall oder Metall-Kunststoffverbund.
Fig. 4 shows a five-layer sheet 20 with the following layer sequence:
  • Printing layer 21, for example, from a vulcanizate;
  • first compressible layer 22;
  • first reinforcement layer 24, for example of a fabric;
  • second compressible layer 23, for example in the form of plastic microspheres in a rubber compound or foamed plastic film;
  • second reinforcement layer 25, for example made of metal or metal-plastic composite.

Die zweite und gleichzeitig unterste Festigkeitsträgerschicht 6 besitzt einen Überstand, der vorteilhaft beim Einspannen des Flächengebildes auf eine Druckwalze ist. Des Weiteren besitzt die unterste Festigkeitsträgerschicht 6 eine Schutzfolie 26, die als Korrosionsschutz für den Druckzylinder dient. Die Schutzfolie 26 kann die Unterseite der untersten Festigkeitsträgerschicht, die keinen Kontakt zu den weiteren Schichten des Flächengebildes hat, vollständig oder teilweise bedecken.The second and at the same time the lowest reinforcement layer 6 has a projection, which is advantageous when clamping the fabric onto a pressure roller. Furthermore, the lowermost strength carrier layer 6 has a protective film 26, which serves as corrosion protection for the printing cylinder. The protective film 26 may completely or partially cover the underside of the lowermost strength support layer, which has no contact with the further layers of the fabric.

Direkt auf der Druckschicht 14 aufliegend befindet sich eine zusätzliche lokal begrenzte Beschichtung 19 beispielsweise aus Teflon. Eine weitere zusätzliche lokal begrenzte Beschichtung 19 aus einem gleichen oder verschiedenen Material befindet sich auf der Übergangszone zwischen Druckschicht 21 und unterster Festigkeitsträgerschicht 26. Zusätzliche Aussparungen oder Vertiefungen in der Druckschicht 21 und / oder der Schutzfolie 26, wie sie in Fig. 4 zu sehen sind, sind vorteilhaft, weil sie zum Pressungsverlust bzw. zur Pressungsreduzierung an dieser Stelle führen und die positiven Effekte der vorliegenden Erfindung unterstützen. Die Aussparungen und / oder Einschnitte können mechanisch, beispielsweise durch Ritzen, Schneiden, Druck, erfolgen oder chemisch, beispielsweise durch Ätzen, oder aber auch durch Bestrahlen, erfolgen. In Fig. 4 befindet sich ein Teil der zusätzlichen lokal begrenzten Beschichtung 19 durch die beschriebenen Aussparungen und / oder Einschnitte teilweise nicht mehr in direktem Kontakt zur Druckschicht 21. Es ist aber auch möglich, dass durch die Aussparungen und / oder Einschnitte lediglich die Dicke der Druckschicht 21 reduziert wird, beispielsweise durch Druck. In diesem Fall hat die zusätzliche lokal begrenzte Beschichtung 19 an dieser Stelle wieder vollständigen Kontakt zur Druckschicht 21.Directly resting on the printing layer 14 is an additional locally limited coating 19, for example made of Teflon. Another additional localized coating 19 of a same or different material is located on the transition zone between print layer 21 and bottom most reinforcing layer 26. Additional recesses or depressions in the print layer 21 and / or the protective film 26 as shown in U.S. Pat Fig. 4 are to be seen, are advantageous because they lead to the loss of pressure or for reducing the pressure at this point and support the positive effects of the present invention. The recesses and / or cuts can be done mechanically, for example by scribing, cutting, pressure, or chemically, for example by etching, or else by irradiation done. In Fig. 4 Part of the additional localized coating 19 is partially no longer in direct contact with the print layer 21 as a result of the described recesses and / or cuts. However, it is also possible that only the thickness of the print layer 21 is reduced by the recesses and / or cuts , for example by pressure. In this case, the additional locally limited coating 19 again has complete contact with the print layer 21 at this point.

Fig.5 zeigt schematisch den Farbübertrag mittels Druckplatten 28 und Drucktuch 29. Die Druckplatten 28 und die Drucktücher 29 sind jeweils auf einem Druckzylinder 30, 31 aufgebracht. Die Druckplatte trägt die Farbe auf das Drucktuch auf, welches dann wiederum die Farbe auf das zu bedruckende Medium 32 abgibt. Der Unterschied zwischen Druckplatte und Drucktuch soll dadurch noch einmal verdeutlicht werden. Figure 5 schematically shows the ink transfer by means of printing plates 28 and blanket 29. The printing plates 28 and the blankets 29 are each applied to a printing cylinder 30, 31. The printing plate applies the ink to the blanket, which in turn emits the ink onto the medium 32 to be printed. The difference between printing plate and blanket should be clarified once again.

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

11 Mehrschichtiges Flachengebilde (Drucktuch)Multilayer flat structure (blanket) 22 Druckschichtprint layer 33 erste kompressible Schichtfirst compressible layer 44 zweite kompressible Schichtsecond compressible layer 55 erste Festigkeitsträgerschichtfirst reinforcement layer 66 zweite Festigkeitsträgerschicht (Metall)second reinforcement layer (metal) 77 lokal begrenzte Beschichtunglocally limited coating 88th Mehrschichtiges Flächengebilde (Drucktuch)Multilayer sheet (printing blanket) 99 Druckschichtprint layer 1010 kompressible Schichtcompressible layer 1111 FestigkeitsträgerschichtStrengthening support layer 1212 lokal begrenzte Beschichtunglocally limited coating 1313 Mehrschichtiges Flächengebilde (Drucktuch)Multilayer sheet (printing blanket) 1414 Druckschichtprint layer 1515 erste kompressible Schichtfirst compressible layer 1616 zweite kompressible Schichtsecond compressible layer 1717 erste Festigkeitsträgerschichtfirst reinforcement layer 1818 zweite Festigkeitsträgerschichtsecond reinforcement layer 1919 lokal begrenzte Beschichtunglocally limited coating 2020 Mehrschichtiges Flächengebilde (Drucktuch)Multilayer sheet (printing blanket) 2121 Druckschichtprint layer 2222 erste kompressible Schichtfirst compressible layer 2323 zweite kompressible Schichtsecond compressible layer 2424 erste Festigkeitsträgerschichtfirst reinforcement layer 2525 zweite Festigkeitsträgerschicht (Metall)second reinforcement layer (metal) 2626 Schutzfolie für zweite FestigkeitsträgerschichtProtective film for second reinforcement layer 2727 lokal begrenzte Beschichtunglocally limited coating 2828 Druckplatteprinting plate 2929 Drucktuchblanket 3030 Druckzylinder des DrucktuchesPrinting cylinder of the blanket 3131 Druckzylinder der DruckplattePrinting cylinder of the printing plate 3232 zu bedruckendes Mediumto be printed medium

Claims (15)

  1. Multilayer sheet-like structure (1, 8, 13, 20, 29) in the form of a printing blanket with:
    - a printing layer (2, 9, 14, 21) made of a polymeric material,
    - at least one compressible layer (3, 4, 10, 15, 16, 22, 23), and
    - at least one reinforcement layer (5, 6, 11, 17, 18, 24, 25),
    where the individual layers together form a bonded composite, characterized in that the printing layer (2, 9, 14, 21) has been provided in locally restricted manner, at at least one location of the printing layer (2, 9, 14, 21), with an additional coating (7, 12, 19, 27) which completely prevents ink transfer at said locally restricted location, where the additional coating (7, 12, 19, 27) is composed of at least one resin and/or of at least one lacquer and/or of at least one polymer.
  2. Multilayer sheet-like structure according to Claim 1, characterized in that the locally restricted additional coating (7, 12, 19, 27) is composed of at least one polymer.
  3. Multilayer sheet-like structure according to either of Claims 1 and 2, characterized in that the locally restricted additional coating (7, 12, 19, 27) is composed of at least one silicone polymer and/or of at least one fluoropolymer.
  4. Multilayer sheet-like structure according to any of Claims 1 to 3, characterized in that the polymeric material of the printing layer (2, 9, 14, 21) is a vulcanizate.
  5. Multilayer sheet-like structure according to Claim 4, characterized in that the vulcanizate is a vulcanized thermoplastic-free rubber mixture comprising at least one rubber component, and also mixture ingredients.
  6. Multilayer sheet-like structure according to Claim 4, characterized in that the vulcanizate is a thermoplastic vulcanizate comprising at least one thermoplastic component, at least one rubber component which has been at least partially crosslinked, and also mixture ingredients.
  7. Multilayer sheet-like structure according to Claim 6, characterized in that the thermoplastic component is polyethylene (PE), polypropylene (PP), polystyrene (PS), polyamide (PA), or polyester (PES).
  8. Multilayer sheet-like structure according to any of Claims 1 to 7, characterized in that the locally restricted additional coating (7, 12, 19, 27) penetrates into the printing layer (2, 9, 14, 21).
  9. Multilayer sheet-like structure according to Claim 8, characterized in that the depth to which the locally restricted additional coating (7, 12, 19, 27) penetrates into the printing layer (2, 9, 14, 21) is at most 1/5 of the thickness of the printing layer (2, 9, 14, 21).
  10. Process for producing a multilayer sheet-like structure (1, 8, 13, 20, 29) in the form of a printing blanket with a printing layer (2, 9, 14, 21) made of a polymeric material, at least one compressible layer (3, 4, 10, 15, 16, 22, 23), and at least one reinforcement layer (5, 6, 11, 17, 18, 24, 25), where the individual layers together form a bonded composite, characterized in that a locally restricted additional coating (7, 12, 19, 27) is applied to the printing layer (2, 9, 14, 21) of a multilayer sheet-like structure (1, 8, 13, 20, 29), and then the locally restricted additional coating (7, 12, 19, 27) is dried.
  11. Process according to Claim 10, characterized in that the locally restricted additional coating (7, 12, 19, 27) is composed of at least one silicone polymer and/or of at least one fluoropolymer.
  12. Process according to Claim 10 or 11, characterized in that the locally restricted additional coating (7, 12, 19, 27) penetrates into the printing layer (2, 9, 14, 21).
  13. Process according to any of Claims 10 to 12, characterized in that the locally restricted additional coating (7, 12, 19, 27) is applied via spreading or spraying.
  14. Process according to any of Claims 10 to 13, characterized in that the drying of the locally restricted additional coating (7, 12, 19, 27) takes place at room temperature in air.
  15. Process according to any of Claims 10 to 14, characterized in that if a printing layer (2, 9, 14, 21) made of a vulcanizable polymeric material is used, said vulcanizable polymeric material has already been completely or to some extent vulcanized prior to application of the locally restricted coating (7, 12, 19, 27).
EP10745221.1A 2009-09-01 2010-08-18 Multilayer sheet material and method for the production thereof Not-in-force EP2473358B1 (en)

Applications Claiming Priority (2)

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DE102009043921A DE102009043921A1 (en) 2009-09-01 2009-09-01 Multilayer sheet and method for its production
PCT/EP2010/062020 WO2011026731A1 (en) 2009-09-01 2010-08-18 Multilayer sheet material and method for the production thereof

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EP2473358A1 EP2473358A1 (en) 2012-07-11
EP2473358B1 true EP2473358B1 (en) 2013-05-15

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EP (1) EP2473358B1 (en)
JP (1) JP2013503755A (en)
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WO (1) WO2011026731A1 (en)

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US10086602B2 (en) 2014-11-10 2018-10-02 Rexam Beverage Can South America Method and apparatus for printing metallic beverage container bodies
EP3028856B2 (en) 2014-12-04 2023-07-26 Ball Beverage Packaging Europe Limited Printing apparatus
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JP2013503755A (en) 2013-02-04
US20120204746A1 (en) 2012-08-16
BR112012004509A2 (en) 2016-03-29
EP2473358A1 (en) 2012-07-11
DE102009043921A1 (en) 2011-03-03
WO2011026731A1 (en) 2011-03-10

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