EP2421713A1 - Multiple-layer flat structure in the form of a printing blanket or a printing plate for flexographic and letterpress printing with laser engraving - Google Patents

Multiple-layer flat structure in the form of a printing blanket or a printing plate for flexographic and letterpress printing with laser engraving

Info

Publication number
EP2421713A1
EP2421713A1 EP10711678A EP10711678A EP2421713A1 EP 2421713 A1 EP2421713 A1 EP 2421713A1 EP 10711678 A EP10711678 A EP 10711678A EP 10711678 A EP10711678 A EP 10711678A EP 2421713 A1 EP2421713 A1 EP 2421713A1
Authority
EP
European Patent Office
Prior art keywords
rubber
layer
printing
multilayer sheet
compressible
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP10711678A
Other languages
German (de)
French (fr)
Other versions
EP2421713B1 (en
Inventor
Stefan Füllgraf
Clemens Knisel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ContiTech Elastomer Beschichtungen GmbH
Original Assignee
ContiTech Elastomer Beschichtungen GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ContiTech Elastomer Beschichtungen GmbH filed Critical ContiTech Elastomer Beschichtungen GmbH
Priority to SI201030684T priority Critical patent/SI2421713T1/en
Publication of EP2421713A1 publication Critical patent/EP2421713A1/en
Application granted granted Critical
Publication of EP2421713B1 publication Critical patent/EP2421713B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N1/00—Printing plates or foils; Materials therefor
    • B41N1/12—Printing plates or foils; Materials therefor non-metallic other than stone, e.g. printing plates or foils comprising inorganic materials in an organic matrix
    • 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
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00—Forme preparation
    • B41C1/02—Engraving; Heads therefor
    • B41C1/04—Engraving; Heads therefor using heads controlled by an electric information signal
    • B41C1/05—Heat-generating engraving heads, e.g. laser beam, electron beam
    • 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
    • B41N2210/04—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
    • B41N2210/14—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 or a printing plate for flexo and high pressure with:
  • the printing layer of the generic sheet with laser engraving in the context of flexo and high pressure usually consists of a photopolymer.
  • the printing layer according to the patent EP 1 315 617 Bl consists of an elastomeric binder, a polymerizable compound, a photoinitiator or a Photoiniatorsystem and a finely divided filler, such as a fumed oxide (silica, titania, alumina).
  • a fumed oxide silicon, titania, alumina
  • a printing relief is engraved by means of a laser in the crosslinked printing layer.
  • the print layer is then also referred to as a relief layer or printing form after the laser treatment.
  • the photopolymer printing layer or printing form is characterized by low color transfer.
  • the erf ⁇ ndungswashe sheet characterized in that the polymeric material of the print layer is a vulcanizate.
  • Vulcanizate is the name for a vulcanizable by vulcanization
  • 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.
  • the vulcanizate is a vulcanized thermoplastic-free rubber mixture containing at least one rubber component and mixing ingredients.
  • rubber components may be mentioned in particular:
  • EPM Ethylene-propylene rubber
  • EPDM Ethylene-propylene-diene rubber
  • NBR Nitrile rubber
  • HNBR hydrogenated nitrile rubber
  • NR Styrene-butadiene Rubber
  • SBR Styrene-butadiene Rubber
  • BR Butadiene Rubber
  • CM Chlorinated Polyethylene
  • CSM Chlorosulfonated polyethylene
  • EVA Ethylene-vinyl acetate rubber
  • ACM Acrylate rubber
  • AEM Ethylene acrylate rubber
  • FFPM Perfluorinated propylene rubber
  • FFKM Perfluorocarbon rubber
  • PU Polyurethane
  • the aforementioned types of rubber may be unblended.
  • EPM EPM
  • EPDM SBR
  • BR BR
  • CR NR
  • NBR NBR
  • the usual compounding ingredients include at least one crosslinker or crosslinker system (crosslinker and accelerator).
  • Other compounding ingredients are usually still a filler and / or a processing aid and / or a plasticizer and / or an aging inhibitor and optionally further additives (for example color pigments).
  • crosslinker and accelerator usually still a filler and / or a processing aid and / or a plasticizer and / or an aging inhibitor and optionally further additives (for example 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).
  • rubber components are in particular EPM, EPDM, SBR, BR, CR, NR or NBR, especially in cuttable design, call.
  • the printing layer rests directly on a compressible layer, in contrast to an embodiment according to the patent EP 0 844 100 Bl, according to which the printing layer has direct contact with a reinforcement layer.
  • the compressible layer which is in direct contact with the printing layer, rests directly on a reinforcing layer, so that the following basic structure exists irrespective of the number of layers:
  • the compressible layer - also called compression layer - serves to avoid a flexing process by reducing the volume in the pressure zone and to compensate for Eind Wegungsunter Kunststoffen.
  • the compressible layer it is crucial that it does not expand when compressed, ie that its volume actually shrinks when compressed, so that no laterally spreading distortions arise.
  • microspheres made of plastic in a rubber compound or a microporous cell structure with enclosed gas chambers (foams) can be used here.
  • the relevant materials are in particular polyurethanes, crosslinked polyethylenes, polypropylenes, NBR, Neoprene and EPM.
  • the modulus of elasticity is usually in the range of 1 MPa to 1000 MPa.
  • a fabric such as a woven fabric or a film such as a polymer film (e.g., polyamide film) or metal foil may 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 describes a six-layer sheet with three fabric layers and one film layer (polymer film or metal foil).
  • the new multi-layered fabric in the form of a blanket or a printing plate is delivered to the customer as roll goods. This assembles the
  • the multilayer sheet can also be supplied as a self-adhesive composite.
  • a comparative experiment and its results are presented in the context of a table.
  • a three-layer printing plate is compared, each with a layer sequence of printing layer, compressible layer and reinforcement layer.
  • the printing layer consists firstly of a prior art of a photopolymer and secondly according to the teaching of the invention of a thermoplastic vulcanizate based on a peroxidically crosslinked EPDM.
  • Test criteria are in each case the most important technical data, namely the tonal range, the color intensity and the dynamic Beiwolf.
  • the printing layer rests directly on a compressible layer.
  • This compressible layer in turn has a direct contact with a reinforcement layer.
  • thermoplastic-free vulcanizate based on EPM, EPDM, SBR, BR, CR, NR or NBR.
  • the aforesaid rubber components may be unblended or form a blend, for example a BR / SBR blend.
  • the new concept is essentially independent of the material of the compressible layer and the reinforcement layer.
  • the creation of the printing form based on a laser printed layer of a vulcanizate is associated with fewer process steps than when working with photopolymers.
  • FIG. 2 shows a cross-section of a five-layered fabric with a pressure layer of a vulcanizate
  • Fig. 3 is a plan view of a printing layer of a vulcanizate with laser engraving.
  • Fig. 1 shows a three-layer sheet 1 in the form of a blanket or a printing plate with a printing layer 2 of a vulcanizate, for example based on EPDM, wherein the printing layer rests directly on a compressible layer 3, for example in the form of plastic microspheres in one rubber compound.
  • This compressible layer then in turn has direct contact with a reinforcement layer 4, for example of a fabric.
  • Second compressible layer 9 for example again in the form of plastic microspheres in a rubber compound
  • Second reinforcement layer 10 for example, again from a fabric.
  • the first Reinforcing layer of a fabric and the second reinforcement layer of a film for example, a polymer film (eg polyamide film) or a metal foil, or a film composite, for example in the form of a polyamide-polyester film composite exist.
  • a polymer film eg polyamide film
  • metal foil e.g. aluminum foil
  • a film composite for example in the form of a polyamide-polyester film composite exist.
  • the multilayer sheets in the embodiments of FIG. 1 and FIG. 2 can be supplied as roll goods.
  • the customer then carries out the laser engraving according to the specification.
  • FIG. 3 now shows a printing layer 11 with a laser engraving 12, here in the form of the year 2005.
  • the printing layer being a vulcanizate, when the printing form is created, an engraving with halftone dots can be produced under the aspect of different depths and shapes.

Abstract

The invention relates to a multiple-layer flat structure (1) in the form of a printing blanket or a printing plate for flexographic and letterpress printing with: - a printing layer (2) which is made from a polymeric material and is provided with laser engraving; - at least one compressible layer (3), and - at least one strength-support layer (4); wherein the individual layers form an adhesive connection among one another. The multiple-layer flat structure (1) according to the invention is distinguished by the fact that the polymeric material of the printing layer (2) is a vulcanisate. Advantageous materials are proposed in this regard. The printing layer (2) expediently lies directly on a compressible layer (3). The compressible layer (3) is in turn in direct contact with a strength-support layer (4).

Description

Beschreibung description
Mehrschichtiges Flächengebilde in Form eines Drucktuches oder einer Druckplatte für den Flexo- und Hochdruck mit einer LasergravurMultilayer sheet-shaped or pressure-plate for flexographic and high-pressure printing with a laser engraving
Die Erfindung betrifft ein mehrschichtiges Flächengebilde in Form eines Drucktuches oder einer Druckplatte für den Flexo- und Hochdruck mit:The invention relates to a multilayer sheet in the form of a blanket or a printing plate for flexo and high pressure with:
— einer Druckschicht aus einem polymeren Werkstoff, die mit einer Lasergravur versehen ist;- A printing layer of a polymeric material which is provided with a laser engraving;
— wenigstens einer kompressiblen Schicht sowie- at least one compressible layer as well
— wenigstens einer Festigkeitsträgerschicht;- At least one strength layer;
wobei die einzelnen Schichten untereinander einen Haftverbund bilden.wherein the individual layers form an adhesive bond with each other.
Ein derartiges Flächengebilde ist beispielsweise aus folgender Literatur bekannt:Such a sheet is known, for example, from the following literature:
EP 0 844 100 BlEP 0 844 100 Bl
EP 1 315 617 Bl EP 2 070 717 AlEP 1 315 617 B1 EP 2 070 717 A1
WO 02/096648 AlWO 02/096648 Al
US 5 798 202US 5,798,202
US 5 804 353US 5,804,353
Technik des Flexodruckes, S. 173 ff, 4. Aufl., 1999, Coating Verlag, St. Gallen (CH) Nach derzeitigem Stand der Technik besteht die Druckschicht des gattungsgemäßen Flächengebildes mit Lasergravur im Rahmen des Flexo- und Hochdruckes zumeist aus einem Photopolymeren. So besteht beispielsweise die Druckschicht nach der Patentschrift EP 1 315 617 Bl aus einem elastomeren Bindemittel, einer polymerisierbaren Verbindung, einem Photoinitiator oder einem Photoiniatorsystem sowie einem feinteiligen Füllstoff, beispielsweise aus einem pyrogenen Oxid (Siliciumoxid, Titanoxid, Aluminiumoxid). Die vollflächige Vernetzung dieser Druckschicht erfolgt dabei durch Bestrahlen mit Licht, beispielsweise mit aktinischem Licht. In die vernetzte Druckschicht wird schließlich ein druckendes Relief mittels eines Lasers eingraviert. Die Druckschicht wird dann nach der Laserbehandlung auch als Reliefschicht oder Druckform bezeichnet.Technique of flexographic printing, p. 173 ff, 4th ed., 1999, Coating Verlag, St. Gallen (CH) According to the current state of the art, the printing layer of the generic sheet with laser engraving in the context of flexo and high pressure usually consists of a photopolymer. Thus, for example, the printing layer according to the patent EP 1 315 617 Bl consists of an elastomeric binder, a polymerizable compound, a photoinitiator or a Photoiniatorsystem and a finely divided filler, such as a fumed oxide (silica, titania, alumina). The full-surface crosslinking of this print layer takes place by irradiation with light, for example with actinic light. Finally, a printing relief is engraved by means of a laser in the crosslinked printing layer. The print layer is then also referred to as a relief layer or printing form after the laser treatment.
Mit einer Druckschicht aus einem Photopolymeren mit Lasergravur sind jedoch folgende Nachteile verbunden:However, the following disadvantages are associated with a printing layer of a photogravure photopolymer:
— Die Herstellung einer Druckfom ist unter Einbezug von mehreren Arbeitsschritten sehr aufwendig.- The production of a Druckfom is very expensive, including several steps.
— Zumeist ist ein Nachstellen des Anpressdruckes beim Drucken mit verschiedenen Geschwindigkeiten bedingt durch die dynamische Steifigkeit des Materials erforderlich.- In most cases, an adjustment of the contact pressure when printing at different speeds due to the dynamic stiffness of the material is required.
— Die photopolymere Druckschicht bzw. Druckform zeichnet sich durch geringe Farbüberträge aus.- The photopolymer printing layer or printing form is characterized by low color transfer.
— Es können Fehler beim Montieren des belichteten photopolymeren Flächengebildes auftreten.- Errors may occur when mounting the exposed photopolymer sheet.
— Der Ausbildung als Rollenware sind Grenzen gesetzt. Zumeist muss der Endverbraucher verschiedene Formate am Lager haben. Zwecks Behebung der vorgenannten Nachteile zeichnet sich das erfϊndungsgemäße Flächengebilde dadurch aus, dass der polymere Werkstoff der Druckschicht ein Vulkanisat ist.- Training as a commodity is limited. In most cases, the end user must have different formats in stock. To remedy the aforementioned disadvantages, the erfϊndungsgemäße sheet characterized in that the polymeric material of the print layer is a vulcanizate.
Vulkanisat ist die Bezeichnung für durch Vulkanisation einer vulkanisierbarenVulcanizate is the name for a vulcanizable by vulcanization
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 Kaltvulkanisation oder die Strahlenvulkanisation kann angewandt werden.Polymer blend manufactured products or product components - here the print 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 sind insbesondere zu nennen:The vulcanizate is a vulcanized thermoplastic-free rubber mixture containing at least one rubber component and mixing ingredients. As rubber components may be mentioned in particular:
Ethylen-Propylen-Kautschuk (EPM)Ethylene-propylene rubber (EPM)
Ethylen-Propylen-Dien-Kautschuk (EPDM) Nitrilkautschuk (NBR)Ethylene-propylene-diene rubber (EPDM) Nitrile rubber (NBR)
(teil)hydrierter Nitrilkautschuk (HNBR)(partially) hydrogenated nitrile rubber (HNBR)
Fluor-Kautschuk (FKM)Fluoro rubber (FKM)
Chloropren-Kautschuk (CR)Chloroprene rubber (CR)
Naturkautschuk (NR) Styrol-Butadien-Kautschuk (SBR)Natural Rubber (NR) Styrene-butadiene Rubber (SBR)
Isopren-Kautschuk (IR) Butylkautschuk (HR)Isoprene rubber (IR) Butyl rubber (HR)
Brombutylkautschuk (BIIR)Bromobutyl rubber (BIIR)
Chlorbutylkautschuk (CUR)Chlorobutyl rubber (CUR)
Butadien-Kautschuk (BR) Chloriertes Polyethylen (CM)Butadiene Rubber (BR) Chlorinated Polyethylene (CM)
Chlorsulfoniertes Polyethylen (CSM)Chlorosulfonated polyethylene (CSM)
Polyepichlorhydrin (ECO)Polyepichlorohydrin (ECO)
Ethylen-Vinylacetat-Kautschuk (EVA)Ethylene-vinyl acetate rubber (EVA)
Acrylat-Kautschuk (ACM) Ethylen- Acrylat-Kautschuk (AEM)Acrylate rubber (ACM) Ethylene acrylate rubber (AEM)
Siliconkautschuk (VMQ)Silicone rubber (VMQ)
Fluorierter Methylsiliconkautschuk (MFQ)Fluorinated methyl silicone rubber (MFQ)
Perfluorinierter Propylen- Kautschuk (FFPM)Perfluorinated propylene rubber (FFPM)
Perfluorcarbon-Kautschuk (FFKM) Polyurethan (PU)Perfluorocarbon rubber (FFKM) Polyurethane (PU)
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. The use of a blend, in particular in conjunction with one of the abovementioned types of rubber, for example an NR / BR blend or a BR / SBR blend, is also possible.
Von besonderer Bedeutung sind: EPM, EPDM, SBR, BR, CR, NR oder NBR.Of particular importance are: EPM, EPDM, SBR, BR, CR, NR or 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.The usual compounding ingredients include at least one crosslinker or crosslinker system (crosslinker and accelerator). Other compounding ingredients are usually still a filler and / or a processing aid and / or a plasticizer and / or an aging inhibitor and optionally further additives (for example color pigments). In this regard, reference is made to the general state of rubber mixing technology.
Variante B Das Vulkanisat ist ein thermoplastisches Vulkanisat, enthaltend wenigstens eine Thermoplastkomponente, wenigstens eine Kautschukkomponente, die zumindest teilvernetzt ist, sowie Mischungsingredienzien.Variant B 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 oder NBR, insbesondere in verschnittfreier Ausführung, zu nennen.As rubber components are in particular EPM, EPDM, SBR, BR, CR, NR or NBR, especially in cuttable design, call.
Hinsichtlich der Mischungsingredienzien wird auf die oben genannte Mischungstechnologie, insbesondere auf die Lehre gemäß der Offenlegungsschrift DE 100 04 632 Al 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.
In Verbindung mit dem neuartigen Werkstoff für die Druckschicht ist es zweckmäßig, dass die Druckschicht direkt auf einer kompressiblen Schicht aufliegt, im Gegensatz zu einer Ausführung gemäß der Patentschrift EP 0 844 100 Bl, wonach die Druckschicht unmittelbaren Kontakt zu einer Festigkeitsträgerschicht hat.In connection with the novel material for the printing layer, it is expedient that the printing layer rests directly on a compressible layer, in contrast to an embodiment according to the patent EP 0 844 100 Bl, according to which the printing layer has direct contact with a reinforcement layer.
Nach einem bevorzugten Schichtenaufbau liegt die kompressible Schicht, die in einem direkten Kontakt mit der Druckschicht steht, direkt auf einer Festigkeitsträgerschicht auf, so dass unabhängig von der Anzahl der Schichten folgender Grundaufbau existiert:According to a preferred layer construction, the compressible layer, which is in direct contact with the printing layer, rests directly on a reinforcing layer, so that the following basic structure exists irrespective of the number of layers:
— Druckschicht;- Print layer;
— kompressible Schicht;- compressible layer;
— Festigkeitsträgerschicht.- Reinforcement layer.
Bei diesem Grundaufbau können sich weitere Schichten anschließen, insbesondere unter dem Aspekt weiterer kompressibler Schichten und Festigkeitsträgerschichten. Die kompressible Schicht - auch Kompressionsschicht genannt - dient zur Vermeidung eines Walkprozesses durch Volumenverminderung in der Druckzone und zur Kompensation von Eindrückungsunterschieden. Bei der kompressiblen Schicht ist entscheidend, dass sie sich beim Zusammendrücken nicht ausdehnt, d.h. dass sich ihr Volumen beim Zusammendrücken tatsächlich verkleinert, damit keine sich seitlich ausbreitenden Verwerfungen entstehen. Verwendet werden können hier beispielsweise Mikrokugeln aus Kunststoff in einer Gummimischung oder ein mikroporöses Zellengebilde mit eingeschlossenen Gaskammern (Schaumstoffe). Die diesbezüglichen Werkstoffe sind insbesondere Polyurethane, vernetzte Polyethylene, Polypropylene, NBR, Neoprene und EPM. Der Elastizitätsmodul liegt zumeist im Bereich von 1 MPa bis 1000 MPa. Hinsichtlich weiterer Details zu der kompressiblen Schicht wird auf die eingangs zitierte Literatur, insbesondere auf die Druckschriften EP 0 844 100 Bl und EP 2 070 717 Al verwiesen.In this basic structure, further layers can follow, in particular under the aspect of further compressible layers and reinforcement layers. The compressible layer - also called compression layer - serves to avoid a flexing process by reducing the volume in the pressure zone and to compensate for Eindrückungsunterschieden. For the compressible layer, it is crucial that it does not expand when compressed, ie that its volume actually shrinks when compressed, so that no laterally spreading distortions arise. For example, microspheres made of plastic in a rubber compound or a microporous cell structure with enclosed gas chambers (foams) can be used here. The relevant materials are in particular polyurethanes, crosslinked polyethylenes, polypropylenes, NBR, Neoprene and EPM. The modulus of elasticity is usually in the range of 1 MPa to 1000 MPa. For further details on the compressible layer, reference is made to the literature cited at the beginning, in particular to the publications EP 0 844 100 B1 and EP 2 070 717 A1.
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 PatentschriftAs the strength support layer, a fabric such as a woven fabric or a film such as a polymer film (e.g., polyamide film) or metal foil may 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 Bl ein sechsschichtiges Flächengebilde mit drei Gewebeschichten und einer Folienschicht (Polymerfolie oder Metallfolie) beschrieben.EP 0 844 100 B1 describes a six-layer sheet with three fabric layers and one film layer (polymer film or metal foil).
Das neue mehrschichtige Flächengebilde in Form eines Drucktuches oder einer Druckplatte wird als Rollenware an den Kunden ausgeliefert. Dieser montiert dieThe new multi-layered fabric in the form of a blanket or a printing plate is delivered to the customer as roll goods. This assembles the
Rollenware auf einen Sleeve (Adaptor, Druckzylinder) und lasert dann die Druckschicht, verbunden mit einer anschließenden Reinigung. In Verbindung mit den heutigen Lasertechnologien kann in die neue Druckschicht aus einem Vulkanisat eine Gravur mit Rasterpunkten mit verschiedenen Tiefen und Formen eingebracht werden. Die Gravurbildung erfolgt schnell, sauber und ohne Lösungsmittel. Es ist dabei eine 100%-ige Passergenauigkeit und Reproduzierbarkeit gewährleistet. Von großer wirtschaftlicher Bedeutung ist die Tatsache, dass der Kunde bei der Erstellung der Druckform deutlich weniger Verfahrensschritte benötigt.Rolled goods on a sleeve (adapter, printing cylinder) and then lasiert the print layer, combined with a subsequent cleaning. In conjunction with today's laser technologies, engraving with halftone dots of different depths and shapes can be introduced into the new printing layer from a vulcanizate. The engraving is done quickly, cleanly and without solvents. It ensures a 100% registration accuracy and reproducibility. Of great economic Significance is the fact that the customer requires significantly fewer process steps when creating the printing form.
Das mehrschichtige Flächengebilde kann auch als selbstklebender Verbund geliefert werden.The multilayer sheet can also be supplied as a self-adhesive composite.
Im folgenden wird ein Vergleichsversuch und dessen Ergebnisse im Rahmen einer Tabelle vorgestellt. Verglichen wird jeweils eine dreischichtige Druckplatte mit jeweils einer Schichtenabfolge von Druckschicht, kompressibler Schicht und Festigkeitsträgerschicht. Die Druckschicht besteht zum einen nach dem Stand der Technik aus einem Photopolymeren und zum anderen nach der erfindungsgemäßen Lehre aus einem thermoplastfreien Vulkanisat auf der Basis eines peroxidisch vernetzten EPDM. Prüfkriterien sind dabei jeweils die wichtigsten drucktechnischen Daten, nämlich des Tonwertumfanges, der Farbintensität und der dynamischen Beistellung.In the following, a comparative experiment and its results are presented in the context of a table. In each case a three-layer printing plate is compared, each with a layer sequence of printing layer, compressible layer and reinforcement layer. The printing layer consists firstly of a prior art of a photopolymer and secondly according to the teaching of the invention of a thermoplastic vulcanizate based on a peroxidically crosslinked EPDM. Test criteria are in each case the most important technical data, namely the tonal range, the color intensity and the dynamic Beistellung.
Tabelletable
Hinsichtlich der Bewertung der Prüfkriterien bedeuten:With regard to the evaluation of the test criteria mean:
+ Standard+ Standard
++ über Standard++ over standard
+++ weit über Standard Unter Bezug auf diesen Vergleichsversuch wie auch ergänzender Untersuchungen bleibt folgendes festzuhalten:+++ far beyond standard With reference to this comparative experiment as well as supplementary investigations, the following must be stated:
— Mit der neuen Druckschicht aus einem Vulkanisat tritt eine signifikante Verbesserung der Druckleistung auf.- With the new printing layer of a vulcanizate occurs a significant improvement in printing performance.
— In diesem Zusammenhang ist es von Vorteil, wenn die Druckschicht direkt auf einer kompressiblen Schicht aufliegt. Diese kompressible Schicht hat wiederum einen direkten Kontakt zu einer Festigkeitsträgerschicht.In this context, it is advantageous if the printing layer rests directly on a compressible layer. This compressible layer in turn has a direct contact with a reinforcement layer.
— Die Besten Ergebnisse werden erzielt bei einem thermoplastfreien Vulkanisat auf der Basis EPM, EPDM, SBR, BR, CR, NR oder NBR. Die vorgenannten Kautschukkomponenten können unverschnitten sein oder einen Verschnitt bilden, beispielsweise einen BR/SBR- Verschnitt.The best results are achieved with a thermoplastic-free vulcanizate based on EPM, EPDM, SBR, BR, CR, NR or NBR. The aforesaid rubber components may be unblended or form a blend, for example a BR / SBR blend.
— Das neue Konzept ist im Wesentlichen unabhängig von dem Werkstoff der kompressiblen Schicht und der Festigkeitsträgerschicht.- The new concept is essentially independent of the material of the compressible layer and the reinforcement layer.
— Es lassen sich eine Vielzahl von Schichtenaufbauten unter dem Aspekt der Auslieferung als Rollenwaren realisieren, wobei das Schichtenkonzept gemäß- It can be a variety of layer structures under the aspect of delivery as a roll goods realize, the layer concept according to
Patentanspruch 10 oder 12 vorteilhafte Gestaltungsvarianten sind, die in Verbindung mit der Figurenbeschreibung noch etwas näher vorgestellt werden.Claim 10 or 12 advantageous design variants, which will be presented in more detail in connection with the description of the figures.
— Die Erstellung der Druckform auf der Grundlage einer gelaserten Druckschicht aus einem Vulkanisat ist mit weniger Verfahrensschritten verbunden als beim Arbeiten mit Photopolymeren.- The creation of the printing form based on a laser printed layer of a vulcanizate is associated with fewer process steps than when working with photopolymers.
Die Erfindung wird nun anhand von Ausführungsbeispielen unter Bezugnahme auf schematische Zeichnungen erläutert. Es zeigen: Fig. 1 einen Querschnitt eines dreischichtigen Flächengebildes mit einer Druckschicht aus einem Vulkanisat;The invention will now be explained by means of exemplary embodiments with reference to schematic drawings. Show it: 1 shows a cross section of a three-layer sheet with a printing layer of a vulcanizate.
Fig. 2 einen Querschnitt eines fünfschichtigen Flächengebildes mit einer Druckschicht aus einem Vulkanisat;FIG. 2 shows a cross-section of a five-layered fabric with a pressure layer of a vulcanizate; FIG.
Fig. 3 eine Draufsicht einer Druckschicht aus einem Vulkanisat mit Lasergravur.Fig. 3 is a plan view of a printing layer of a vulcanizate with laser engraving.
Fig. 1 zeigt ein dreischichtiges Flächengebilde 1 in Form eines Drucktuches oder einer Druckplatte mit einer Druckschicht 2 aus einem Vulkanisat, beispielsweise auf der Basis von EPDM, wobei die Druckschicht direkt auf einer kompressiblen Schicht 3 aufliegt, beispielsweise in Form von Mikrokugeln aus Kunststoff in einer Gummimischung. Diese kompressible Schicht hat dann wiederum direkten Kontakt zu einer Festigkeitsträgerschicht 4, beispielsweise aus einem Gewebe.Fig. 1 shows a three-layer sheet 1 in the form of a blanket or a printing plate with a printing layer 2 of a vulcanizate, for example based on EPDM, wherein the printing layer rests directly on a compressible layer 3, for example in the form of plastic microspheres in one rubber compound. This compressible layer then in turn has direct contact with a reinforcement layer 4, for example of a fabric.
Fig. 2 zeigt ein fünfschichtiges Flächengebilde 5 mit folgender Schichtenabfolge:2 shows a five-layer sheet 5 with the following layer sequence:
— Druckschicht 6 aus einem Vulkanisat;- Print layer 6 of a vulcanizate;
— erste kompressible Schicht 7, beispielsweise in Form von Mikrokugeln aus Kunststoff in einer Gummimischung;- First compressible layer 7, for example in the form of plastic microspheres in a rubber compound;
— erste Festigkeitsträgerschicht 8, beispielsweise aus einem Gewebe;- First reinforcement layer 8, for example of a fabric;
— zweite kompressible Schicht 9, beispielsweise wiederum in Form von Mikrokugeln aus Kunststoff in einer Gummimischung;Second compressible layer 9, for example again in the form of plastic microspheres in a rubber compound;
— zweite Festigkeitsträgerschicht 10, beispielsweise wiederum aus einem Gewebe.- Second reinforcement layer 10, for example, again from a fabric.
Bei einem Flächengebilde gemäß Fig. 2 ist es auch 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 the case of a fabric according to FIG. 2, it is also possible to work with different reinforcement layers by, for example, the first Reinforcing layer of a fabric and the second reinforcement layer of a film, for example, a polymer film (eg polyamide film) or a metal foil, or a film composite, for example in the form of a polyamide-polyester film composite exist.
Die mehrschichtigen Flächengebilde in den Ausführungsbeispielen gemäß Fig. 1 und Fig. 2 können als Rollenwaren geliefert werden. Der Kunde führt dann entsprechend der Vorgabe die Lasergravur durch.The multilayer sheets in the embodiments of FIG. 1 and FIG. 2 can be supplied as roll goods. The customer then carries out the laser engraving according to the specification.
Fig. 3 zeigt nun eine Druckschicht 11 mit einer Lasergravur 12, und zwar hier in Form der Jahreszahl 2005. Dadurch dass die Druckschicht ein Vulkanisat ist, kann bei der Erstellung der Druckform eine Gravur mit Rasterpunkten unter dem Aspekt verschiedener Tiefen und Formen erzeugt werden. FIG. 3 now shows a printing layer 11 with a laser engraving 12, here in the form of the year 2005. As a result of the printing layer being a vulcanizate, when the printing form is created, an engraving with halftone dots can be produced under the aspect of different depths and shapes.
BezugszeichenlisteLIST OF REFERENCE NUMBERS
(Teil der Beschreibung)(Part of the description)
I Mehrschichtiges Flachengebilde (Drucktuch, Druckplatte) 2 DruckschichtI Multilayer flat structure (printing blanket, printing plate) 2 printing layer
3 kompressible Schicht3 compressible layer
4 Festigkeitsträgerschicht4 reinforcement layer
5 Mehrschichtiges Flächengebilde (Drucktuch, Druckplatte)5 multilayer sheet (blanket, printing plate)
6 Druckschicht 7 erste kompressible Schicht6 print layer 7 first compressible layer
8 erste Festigkeitsträgerschicht8 first reinforcement layer
9 zweite kompressible Schicht9 second compressible layer
10 zweite Festigkeitsträgerschicht10 second reinforcement layer
I I Druckschicht 12 Lasergravur I I printing layer 12 laser engraving

Claims

Patentansprüche claims
1. Mehrschichtiges Flächengebilde (1, 5) in Form eines Drucktuches oder einer Druckplatte für den Flexo- und Hochdruck mit:1. multilayer sheet (1, 5) in the form of a blanket or a printing plate for flexo and high pressure with:
— einer Druckschicht (2, 6, 11) aus einem polymeren Werkstoff, die mit einer Lasergravur (12) versehen ist;- A printing layer (2, 6, 11) made of a polymeric material, which is provided with a laser engraving (12);
— wenigstens einer kompressiblen Schicht (3, 7, 9) sowie- At least one compressible layer (3, 7, 9) and
— wenigstens einer Festigkeitsträgerschicht (4, 8, 10);- At least one strength support layer (4, 8, 10);
wobei die einzelnen Schichten untereinander einen Haftverbund bilden, dadurch gekennzeichnet, dass der polymere Werkstoff der Druckschicht (2, 6, 11) einwherein the individual layers form an adhesive bond with each other, characterized in that the polymeric material of the printing layer (2, 6, 11) a
Vulkanisat ist.Vulcanizate is.
2. Mehrschichtiges Flächengebilde nach Anspruch 1, dadurch gekennzeichnet, dass das Vulkanisat eine vulkanisierte thermoplastfreie Kautschukmischung ist, enthaltend wenigstens eine Kautschukkomponente sowie Mischungsingredienzien.2. A multilayer sheet according to claim 1, characterized in that the vulcanizate is a vulcanized thermoplastic rubber mixture containing at least one rubber component and Mischingingredienzien.
3. Mehrschichtiges Flächengebilde nach Anspruch 2, dadurch gekennzeichnet, dass die Kautschukkomponente Ethylen-Propylen-Kautschuk (EPM), Ethylen-Propylen-Dien- Kautschuk (EPDM), Nitrilkautschuk (NBR), (teil)hydrierter Nitrilkautschuk (HNBR), Fluor-Kautschuk (FKM), Chloropren-Kautschuk (CR), Naturkautschuk (NR), Styrol-3. Multilayer sheet according to claim 2, characterized in that the rubber component is ethylene-propylene rubber (EPM), ethylene-propylene-diene rubber (EPDM), nitrile rubber (NBR), (partially) hydrogenated nitrile rubber (HNBR), fluorine Rubber (FKM), chloroprene rubber (CR), natural rubber (NR), styrene
Butadien-Kautschuk (SBR), Isopren-Kautschuk (IR), Butylkautschuk (HR), Brombutylkautschuk (BIIR), Chlorbutylkautschuk (CUR), Butadien-Kautschuk (BR), Chloriertes Polyethylen (CM), Chlorsulfoniertes Polyethylen (CSM), Polyepichlorhydrin (ECO), Ethylen-Vinylacetat-Kautschuk (EVA), Acrylat- Kautschuk (ACM), Ethylen-Acrylat-Kautschuk (AEM), Siliconkautschuk (VMQ),Butadiene rubber (SBR), isoprene rubber (IR), butyl rubber (HR), bromobutyl rubber (BIIR), chlorobutyl rubber (CUR), butadiene rubber (BR), chlorinated polyethylene (CM), chlorosulfonated polyethylene (CSM), polyepichlorohydrin ( ECO), ethylene-vinyl acetate rubber (EVA), acrylate rubber (ACM), ethylene-acrylate rubber (AEM), silicone rubber (VMQ),
Fluorierter Methylsiliconkautschuk (MFQ), Perfluorinierter Propylen-Kautschuk (FFPM), Perfluorcarbon-Kautschuk (FFKM) oder Polyurethan (PU) ist, wobei die vorgenannten Kautschuktypen verschnittfrei oder in einem Verschnitt, insbesondere in Verbindung mit einem der vorgenannten Kautschuktypen, zum Einsatz gelangen.Fluorinated methyl silicone rubber (MFQ), perfluorinated propylene rubber (FFPM), perfluorocarbon rubber (FFKM) or polyurethane (PU), the abovementioned types of rubber being used without offcuts or in a blend, in particular in combination with one of the abovementioned types of rubber.
4. Mehrschichtiges Flächengebilde nach Anspruch 3, dadurch gekennzeichnet, dass die Kautschukkomponente EPM, EPDM, SBR, BR, CR, NR oder NBR ist4. The multilayer sheet according to claim 3, wherein the rubber component is EPM, EPDM, SBR, BR, CR, NR or NBR
5. Mehrschichtiges Flächengebilde nach Anspruch 1, dadurch gekennzeichnet, dass das Vulkanisat ein thermoplastisches Vulkanisat ist, enthaltend wenigstens eine Thermoplastkomponente, wenigstens eine Kautschukkomponente, die zumindest teilvernetzt ist, sowie Mischungsingredienzien.5. A multilayer sheet according to claim 1, characterized in that the vulcanizate is a thermoplastic vulcanizate, comprising at least one thermoplastic component, at least one rubber component which is at least partially crosslinked, and Mischingingredienzien.
6. Mehrschichtiges Flächengebilde nach Anspruch 5, dadurch gekennzeichnet, dass die Thermplastkomponente Polyethylen (PE), Polypropylen (PP), Polystyrol, Polyamid (PA) oder Polyester (PES) ist.6. Multilayer sheet material according to claim 5, characterized in that the Thermplastkomponente polyethylene (PE), polypropylene (PP), polystyrene, polyamide (PA) or polyester (PES) is.
7. Mehrschichtiges Flächengebilde nach Anspruch 5 oder 6, dadurch gekennzeichnet, dass die Kautschukkomponente EPM, EPDM, SBR, BR, CR, NR oder NBR ist.7. A multilayer sheet according to claim 5 or 6, characterized in that the rubber component is EPM, EPDM, SBR, BR, CR, NR or NBR.
8. Mehrschichtiges Flächengebilde nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass die Druckschicht (2, 6, 11) direkt auf einer kompressiblen Schicht (3, 7) aufliegt.8. Multilayer sheet material according to one of claims 1 to 7, characterized in that the printing layer (2, 6, 11) rests directly on a compressible layer (3, 7).
9. Mehrschichtiges Flächengebilde nach Anspruch 8, dadurch gekennzeichnet, dass die kompressible Schicht (3, 7), die in einem direkten Kontakt mit der Druckschicht9. Multilayer sheet according to claim 8, characterized in that the compressible layer (3, 7), in direct contact with the printing layer
(2, 6, 11) steht, direkt auf einer Festigkeitsträgerschicht (4, 8) aufliegt.(2, 6, 11), rests directly on a reinforcement layer (4, 8).
10. Mehrschichtiges Flächengebilde nach Anspruch 9, dadurch gekennzeichnet, dass das Flächengebilde (1) dreischichtig ist, und zwar in folgender Schichtenabfolge: — Druckschicht (2);10. Multilayer sheet material according to claim 9, characterized in that the sheet (1) is three-layered, in the following layer sequence: - Print layer (2);
— kompressible Schicht (3);- compressible layer (3);
— Festigkeitsträgerschicht (4).- Reinforcing layer (4).
11. Mehrschichtiges Flächengebilde nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass das Flächengebilde (5) wenigstens vierschichtig ist.11. A multilayer sheet according to any one of claims 1 to 9, characterized in that the sheet (5) is at least four layers.
12. Mehrschichtiges Flächengebilde nach Anspruch 11 in Verbindung mit Anspruch 9, dadurch gekennzeichnet, dass das Flächengebilde (5) fünfschichtig ist, und zwar in folgender Schichtenabfolge:12. The multilayer sheet according to claim 11 in combination with claim 9, characterized in that the sheet (5) is five-layered, in the following layer sequence:
— Druckschicht (6);- Print layer (6);
— erste kompressible Schicht (7);- first compressible layer (7);
— erste Festigkeitsträgerschicht (8);- first reinforcement layer (8);
— zweite kompressible Schicht (9);- second compressible layer (9);
— zweite Festigkeitsträgerschicht (10). - Second reinforcement layer (10).
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