EP2755827B1 - Device and method for improved direct printing of decorative panels - Google Patents

Device and method for improved direct printing of decorative panels Download PDF

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Publication number
EP2755827B1
EP2755827B1 EP13771162.8A EP13771162A EP2755827B1 EP 2755827 B1 EP2755827 B1 EP 2755827B1 EP 13771162 A EP13771162 A EP 13771162A EP 2755827 B1 EP2755827 B1 EP 2755827B1
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EP
European Patent Office
Prior art keywords
carrier
printing unit
printing
electrostatic charges
electrostatic
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Active
Application number
EP13771162.8A
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German (de)
French (fr)
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EP2755827A1 (en
Inventor
Hans-Jürgen HANNIG
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.)
Akzenta Paneele and Profile GmbH
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Akzenta Paneele and Profile GmbH
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Priority to PL13771162T priority Critical patent/PL2755827T3/en
Priority to EP13771162.8A priority patent/EP2755827B1/en
Publication of EP2755827A1 publication Critical patent/EP2755827A1/en
Application granted granted Critical
Publication of EP2755827B1 publication Critical patent/EP2755827B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J11/00—Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
    • B41J11/02—Platens
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J3/00—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed
    • B41J3/407—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed for marking on special material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J11/00—Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
    • B41J11/0015—Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form for treating before, during or after printing or for uniform coating or laminating the copy material before or after printing

Definitions

  • the present invention relates to a device for improved direct printing of decorative panels, as well as a method for improved direct printing of decorative panels.
  • a panel printing apparatus according to the preamble of claim 1 is known from the document US 6 634 729 B1 known.
  • the term decorative panel is understood to mean wall, ceiling or floor panels which have a decor applied to a carrier plate.
  • Decorative panels are used in a variety of ways, both in the field of interior design of rooms, as well as the decorative cladding of buildings, for example in exhibition construction.
  • One of the most common uses of decorative panels is their use as floor coverings.
  • the decorative panels often have a decor that is intended to recreate a natural material.
  • simulated natural materials are wood species such as e.g. Maple, oak, birch, cherry, ash, walnut, chestnut, wenge or even exotic woods such as panga panga, mahogany, bamboo and bubinga.
  • wood species such as e.g. Maple, oak, birch, cherry, ash, walnut, chestnut, wenge or even exotic woods such as panga panga, mahogany, bamboo and bubinga.
  • many natural materials such as Steinobei vom or ceramic surfaces are modeled.
  • such decorative panels are often produced as laminates, in which on a carrier plate with a desired decor pre-printed decorative paper is applied, which in turn is then applied a so-called overlay. After optionally a Gegenzugpapier was still applied to the decorative paper opposite side of the support plate, the layer structure obtained is firmly bonded together using suitable pressure and / or heat-activated adhesive.
  • the material of the carrier can be selected depending on the field of application.
  • the support may be made of wood-based material unless the decorative panel is exposed to excessive moisture or weather conditions.
  • the carrier may for example consist of a plastic.
  • wood-based materials in addition to solid wood materials are also materials such as e.g. Cross laminated timber, glued laminated timber, composite plywood, laminated plywood, veneer plywood, veneer plywood and bent plywood.
  • wood-base materials within the meaning of the invention also include wood-chip materials, such as wood-based materials. Chipboard, extruded sheet, Oriented Structural Board (OSB) and chipboard wood, as well as wood fiber materials such as Wood fiber insulation boards (HFD), medium-hard and hard fiberboard (MB, HFH), and in particular medium-density fiberboard (MDF) and high-density fibreboard (HDF) to understand.
  • wood fiber insulation boards HFD
  • MB medium-hard and hard fiberboard
  • MDF medium-density fiberboard
  • HDF high-density fibreboard
  • WPC wood-plastic composites
  • sandwich panels of a lightweight core material such as foam, rigid foam or paper honeycomb and a wooden layer applied thereto, and mineral, e.g. with cement, bonded chipboards form wood materials in the context of the invention.
  • Cork also represents a wood material in the context of the invention.
  • Plastics which can be used in the production of corresponding panels are, for example, thermoplastics, such as polyvinyl chloride, polyolefins (for example polyethylene (PE), polypropylene (PP), polyamides (PA), polyurethanes (PU), polystyrene (PS), acrylonitrile). Butadiene-styrene (ABS), polymethyl methacrylate (PMMA), polycarbonate (PC), polyethylene terephthalate (PET), polyetheretherketone (PEEK) or Mixtures or copolymers of these.
  • the plastics may contain conventional fillers, for example calcium carbonate (chalk), alumina, silica gel, quartz flour, wood flour, gypsum. Also, they can be colored in a known manner.
  • direct printing refers to the application of a decoration directly to the support of a panel or to a non-printed fiber material layer applied to the support. Contrary to the conventional method, in which a previously printed with a desired decor decorative layer is applied to a carrier, the printing of the decoration takes place during direct printing directly in the course of panel production.
  • the inkjet process inkjet printing process is used.
  • fiber materials materials such as e.g. Paper and nonwovens based on vegetable, animal, mineral or even artificial fibers to understand, as well as cardboard.
  • fibrous materials made of vegetable fibers, in addition to papers and webs of cellulose fibers, plates of biomass such as straw, maize straw, bamboo, leaves, algae extracts, hemp, cotton or oil palm fibers.
  • animal fiber materials are keratin-based materials such as e.g. Wool or horsehair.
  • mineral fiber materials are mineral wool or glass wool.
  • a wearing and / or covering layer in the sense of the invention is a layer applied as an outer finish, which in particular protects the decorative layer from abrasion or damage by dirt, moisture or mechanical effects such as abrasion.
  • the wear layer hard materials such as Titanium nitride, titanium carbide, silicon nitride, silicon carbide, boron carbide, tungsten carbide, tantalum carbide, alumina (corundum), zirconium oxide or mixtures thereof to increase the wear resistance of the layer.
  • the hard material in an amount between 5 wt .-% and 40 wt .-%, preferably between 15 wt .-% and 25 wt .-% in the wear layer composition is included.
  • the hard material preferably has an average particle diameter between 10 ⁇ m and 250 ⁇ m, more preferably between 10 ⁇ m and 100 ⁇ m. In this way, it is advantageously achieved that the wear layer composition forms a stable dispersion and segregation or settling of the hard material in the wear layer composition can be avoided.
  • the hard material-containing and radiation-curable composition in a concentration between 10 g / m 2 and 250 g / m 2 , preferably between 25 g / m 2 and 100g / m 2 applied becomes.
  • the application can be applied for example by means of rollers, such as rubber rollers or by means of pouring devices.
  • the hard material is not present in the composition at the time of application of the wear layer composition, but is scattered as particles onto the applied wear layer composition and this is subsequently cured.
  • a matching with the decor surface structuring is introduced.
  • the surface of the decorative panel has a haptic perceptible structure which corresponds to the shape and pattern of the applied decor, so as to obtain a true to the original reproduction of a natural material also in terms of haptics.
  • the carrier plate already has a structuring and alignment of a printing tool for applying the decoration and the support plate to each other in dependence on the detected by means of optical methods structuring of the carrier plate.
  • a structuring of the decorative panels after the application of the cover and / or wear layer takes place.
  • a curable composition is applied as cover and / or wear layer and a curing process takes place only to the extent that only partial hardening of the cover and / or wear layer takes place.
  • a desired surface structure is impressed by means of suitable tools, such as a hard metal structural roll or a stamp.
  • the embossing is done in accordance with the applied decor.
  • a further hardening of the now structured covering and / or wear layer takes place.
  • the invention thus proposes a panel printing machine comprising a supply means for a support to be printed and a printing unit, characterized in that the panel printing unit comprises at least one means for discharging electrostatic charges from the support and at least one behind the means for discharging electrostatic charges Having arranged from the carrier means for supplying electrostatic charges to the carrier.
  • a device for dissipating electrostatic charges from the substrates to be printed in combination with at least one arranged behind the means for discharging electrostatic charges from the carrier device for supplying electrostatic charges to the carrier is suitable, the occurrence of Blurs in the course of the production process to avoid.
  • the undefined electrostatic charge in the substrates to be printed during the production process leads to an undefined deflection of the ink or ink drops on their way from the print head to the surface to be printed. It is assumed that the build-up electrostatic field on the carriers not predictably distracts the generally positively charged color particles, so that they do not impinge on the intended point of the surface to be printed.
  • the undefined deflection of ink drops can be prevented by an unpredictable electrostatic charge. It has surprisingly been found that the printed image compared to a mere discharge of electrostatic charges can be further improved.
  • the device for supplying electrostatic charges to the carrier behind, ie in the direction of movement of the carrier a means for dissipating electrostatic charges from the carrier and in particular spaced therefrom, can thereby a particularly accurate electrostatic charge in or on the carrier be applied.
  • the carrier may have a particularly uniform and defined electrostatic charge or charge during printing, since local charge peaks can be prevented.
  • the type, ie positive or negative polarity, and size of the charge introduced or applied can be selected depending on the material of the carrier and / or the printing process and / or other factors.
  • the device for supplying electrostatic charges to the carrier may have a charge generator for positive (+) or negative (-) polarity and in this case to a power supply or to a power supply be connected to apply a defined charge on the carrier or the carrier surface.
  • the printed image at a direct pressure on a carrier be significantly improved.
  • the device for discharging electrostatic charges from the carrier and / or the device for supplying electrostatic charges to the carrier is configured as a bar, which has a substantially parallel to a surface of the carrier and in Direction of the carrier arranged surface.
  • this surface of the strip serving as an active loading or unloading surface can extend over the entire width of the carrier, ie substantially in a direction at right angles to the direction of movement of the carrier over the entire extent of the carrier.
  • a surface of the strip running essentially parallel to a surface of the carrier may in particular mean that the strip is essentially at least in the electrostatically discharging or loading region, ie for example with a deviation of ⁇ 20%, in particular ⁇ 10%, for example ⁇ 1 %, has a uniform distance to the carrier.
  • Such a strip may in particular be such a component which is approximately rectangular in shape and has, for example, two plane-aligned surfaces, which surfaces are arranged in the direction of the carrier and in the opposite direction.
  • the device for discharging electrostatic charges from the carrier and / or the device for supplying electrostatic charges to the carrier can be designed as a ground bar.
  • corona discharges can be avoided and local charge peaks or charge changes can be effectively prevented, so that a discharge and in particular an electrostatic charge to produce a highly uniform charge distribution can be particularly uniform and defined realizable, so that the printed image can be particularly defined and high quality.
  • An electrostatic charge can be realized, for example, by applying a defined voltage to the strip, wherein the nature and amount of the voltage can influence or set the type and amount of the electrostatic charge.
  • an electrostatic charging can be improved by an electrically conductive contacting of the moving support through the bar.
  • an electrostatic discharge wherein in this case, a discharge by applying a voltage or by connecting to an electrical ground potential may be possible.
  • the means for discharging electrostatic charges comprises at least one roller, brush or lip made of a conductive material, which electrically contacts the carrier at least in the region of the printing unit and which is connected to an electrical ground potential.
  • the electrical ground potential can be provided for example by a ground.
  • the discharge of the electrostatic charge takes place via a roller, which is part of the feed device to the printing unit. This allows a compact design of the device can be achieved. According to a particularly preferred embodiment of the invention, it may be provided that a plurality of the transport of the carrier within a manufacturing line for the production of decorative panels are designed such that it can be discharged via this any occurring electrostatic charges.
  • the strip, roller, brush or lip is preferably formed at least in the contact region with the carrier of a material having a conductivity ⁇ 1 * 10 3 Sm -1 .
  • the electrical resistance between the carrier and the mass potential is ⁇ 0.5 S2, preferably ⁇ 0.05 ⁇ .
  • the strip, roller, brush or lip, by means of which the carrier is contacted may for example be formed in the contact region with the carrier of an electrically conductive metal such as steel, chromium, copper, aluminum, silver or a conductive alloy such as brass or bronze.
  • the roller, brush or lip at least partially made of an electrically conductive plastic.
  • suitable electrically conductive plastics are poly-3,4-ethylenedioxythiophene, doped polythiophene, doped polyethyne, polyaniline and polypyrrole.
  • An advantage of such conductive plastics over metals is that the plastics are softer than the metals, thereby avoiding any damage to the backing by scratching.
  • the roller, brush or lip consists of a conductive fabric at least at the contact points with the carrier. This can be for example a plastic fabric, in which metal threads are woven.
  • this has a printing unit upstream Ionticianseimichtung by means of which an ionized air jet is passed over the carrier to be printed. It has been found that the exposure to ionized air is suitable for further reducing or increasing the occurrence of electrostatic charging of the carriers.
  • the printing unit to an inkjet print head.
  • a discharge is carried out in a range of greater than or equal to 7 kV, in particular greater than or equal to 10 kV, for example in a range of greater than or equal to 7 kV to less than or equal to 15 kV.
  • an electrostatic charge in a range of greater than 0 kV to less than or equal to 15 kV, for example, to less than or equal to 10 kV, regardless of the type of charge, are performed. It has surprisingly been found that in particular a discharge by a prescribed amount of charge and / or a loading by a prescribed amount of charge can lead to a particularly good print image.
  • the means for reducing the electrostatic charge comprise the electrically conductive contacting of the carrier with a ground potential.
  • the contacting of the carrier by means of a bar, roller, brush or lip made of a material having an electrical conductivity ⁇ 1 * 10 3 Sm -1 .
  • the carrier is subjected to an ionized air flow before and / or during the feed to the printing unit. It has been shown that the admission with an ionized air stream is capable of significantly reducing or increasing an electrostatic charge in the carriers.
  • Fig. 1 1 shows a panel printing device 100.
  • the device 100 has a feed device 110 for a carrier 600 to be printed, by means of which the carrier 600 is fed to a printing unit 120.
  • the printing unit 120 comprises an inkjet printhead which, under the control of a computer system, applies a decorative image to the carrier 600.
  • the device 100 has a device 130 for discharging electrostatic charges from the carrier 600, which may touch the carrier 600 approximately, and further comprises a means disposed behind the device 130 for discharging electrostatic charges from the carrier 600 means 170 for supplying electrostatic charges on the Carrier 600, which can also touch the carrier 600.
  • the device 130 and the device 170 are arranged in the region of the feed device 110 and formed from a rectangular strip of a conductive material, wherein the discharge device 130 is connected by a ground 150 to a ground potential and the lead-in 170 with a power supply 180 or with a Voltage source is connected.

Landscapes

  • Ink Jet (AREA)
  • Printing Methods (AREA)
  • Coating Apparatus (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)
  • Delivering By Means Of Belts And Rollers (AREA)
  • Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Elimination Of Static Electricity (AREA)
  • Laminated Bodies (AREA)

Description

Die vorliegende Erfindung betrifft eine Vorrichtung zum verbesserten Direktdruck von Dekorpaneelen, sowie ein Verfahren zum verbesserten Direktdruck von Dekorpaneelen.The present invention relates to a device for improved direct printing of decorative panels, as well as a method for improved direct printing of decorative panels.

Eine Paneelbedruckungsvorrichtung nach dem Oberbegriff des Anspruchs 1 ist aus dem Dokument US 6 634 729 B1 bekannt.A panel printing apparatus according to the preamble of claim 1 is known from the document US 6 634 729 B1 known.

Unter dem Begriff Dekorpaneel sind im Sinne der Erfindung Wand-, Decken, oder Bodenpannele zu verstehen, welche ein auf eine Trägerplatte aufgebrachtes Dekor aufweisen. Dekorpaneele werden dabei in vielfältiger Weise sowohl im Bereich des Innenausbaus von Räumen, als auch zur dekorativen Verkleidung von Bauten, beispielsweise im Messebau verwendet. Eine der häufigsten Einsatzbereiche von Dekorpaneelen ist deren Nutzung als Fußbodenbelag. Die Dekorpaneele weisen dabei vielfach ein Dekor auf, welches einen Naturwerkstoff nachempfinden soll.For the purposes of the invention, the term decorative panel is understood to mean wall, ceiling or floor panels which have a decor applied to a carrier plate. Decorative panels are used in a variety of ways, both in the field of interior design of rooms, as well as the decorative cladding of buildings, for example in exhibition construction. One of the most common uses of decorative panels is their use as floor coverings. The decorative panels often have a decor that is intended to recreate a natural material.

Beispiele für solche nachempfundenen Naturwerkstoffe sind Holzart wie z.B. Ahorn, Eiche, Birke, Kirsche, Esche, Nussbaum, Kastanie, Wenge oder auch exotische Hölzer wie Panga-Panga, Mahagoni, Bambus und Bubinga. Darüber hinaus werden vielfach Naturwerkstoffe wie Steinobeiflächen oder Keramikoberflächen nachempfunden.Examples of such simulated natural materials are wood species such as e.g. Maple, oak, birch, cherry, ash, walnut, chestnut, wenge or even exotic woods such as panga panga, mahogany, bamboo and bubinga. In addition, many natural materials such as Steinobeiflächen or ceramic surfaces are modeled.

Bisher werden solche Dekorpaneele vielfach als Laminate hergestellt, bei welchen auf eine Trägerplatte ein mit einem gewünschten Dekor vorbedrucktes Dekorpapier aufgebracht wird, auf welches dann wiederum ein sogenanntes Overlay aufgebracht wird. Nachdem gegebenenfalls noch auf der dem Dekorpapier gegenüberliegenden Seite der Trägerplatte ein Gegenzugpapier aufgebracht wurde, wird der erhaltene Schichtenaufbau unter Verwendung geeigneter druck- und/oder wärmeaktivierter Klebemittel fest miteinander verbunden.So far, such decorative panels are often produced as laminates, in which on a carrier plate with a desired decor pre-printed decorative paper is applied, which in turn is then applied a so-called overlay. After optionally a Gegenzugpapier was still applied to the decorative paper opposite side of the support plate, the layer structure obtained is firmly bonded together using suitable pressure and / or heat-activated adhesive.

In Anhängigkeit des gewünschten Einsatzbereiches der Dekorpaneele können diese aus unterschiedlichen Materialen gefertigt sein. Insbesondere kann dabei das Material des Trägers in Abhängigkeit des Einsatzbereichs gewählt sein. So kann der Träger beispielsweise aus einem Holzwerkstoff bestehen, sofern das Dekorpaneele keiner übermäßigen Feuchtigkeit oder Witterungsbedingungen ausgesetzt ist. Soll das Paneel hingegen z.B. in Feuchträumen oder im Außenbereich eingesetzt werden, kann der Träger beispielsweise aus einem Kunststoff bestehen.Depending on the desired field of application of the decorative panels, these can be made of different materials. In particular, the material of the carrier can be selected depending on the field of application. For example, the support may be made of wood-based material unless the decorative panel is exposed to excessive moisture or weather conditions. On the other hand, if the panel is to be e.g. used in wet rooms or outdoors, the carrier may for example consist of a plastic.

Holzwerkstoffe im Sinne der Erfindung sind dabei neben Vollholzwerkstoffen auch Materialien wie z.B. Brettsperrholz, Brettschichtholz, Stabsperrholz, Funiersperrholz, Furnierschichtholz, Funierstreifenholz und Biegesperrholz. Darüber hinaus sind unter Holzwerkstoffen im Sinne der Erfindung auch Holzspanwerkstoffe wie z.B. Spanpressplatten, Strangpressplatten, Grobspanplatten (Oriented Structural Board, OSB) und Spanstreifenholz sowie auch Holzfaserwerkstoffe wie z.B. Holzfaserdämmplatten (HFD), mittelharte und harte Faserplatten (MB, HFH) , sowie insbesondere mitteldichte Faserplatten (MDF) und hochdichte Faserplatten (HDF) zu verstehen. Auch moderne Holzwerkstoffe wie Holz-Polymer-Werkstoffe (Wood Plastic Composite, WPC), Sandwichplatten aus einem leichten Kernmaterial wie Schaumstoff, Hartschaum oder Papierwaben und einer darauf aufgebrachten Holzschicht, sowie mineralisch, z.B. mit Zement, gebundene Holzspanplatten bilden Holzwerkstoffe im Sinne der Erfindung. Auch Kork stellt dabei einen Holzwerkstoff im Sinne der Erfindung dar.For the purposes of the invention, wood-based materials in addition to solid wood materials are also materials such as e.g. Cross laminated timber, glued laminated timber, composite plywood, laminated plywood, veneer plywood, veneer plywood and bent plywood. In addition, wood-base materials within the meaning of the invention also include wood-chip materials, such as wood-based materials. Chipboard, extruded sheet, Oriented Structural Board (OSB) and chipboard wood, as well as wood fiber materials such as Wood fiber insulation boards (HFD), medium-hard and hard fiberboard (MB, HFH), and in particular medium-density fiberboard (MDF) and high-density fibreboard (HDF) to understand. Also, modern wood materials such as wood-plastic composites (WPC), sandwich panels of a lightweight core material such as foam, rigid foam or paper honeycomb and a wooden layer applied thereto, and mineral, e.g. with cement, bonded chipboards form wood materials in the context of the invention. Cork also represents a wood material in the context of the invention.

Kunststoffe, welche bei der Herstellung entsprechender Paneele eingesetzt werden können, sind beispielsweise thermoplastische Kunststoffe, wie Polyvinylchlorid, Polyolefine (beispielsweise Polyethylen (PE), Polypropylen (PP), Polyamide (PA), Polyurethane (PU), Polystyrol (PS), Acrylnitril-Butadien-Styrol (ABS), Polymethylmethacrylat (PMMA), Polycarbonat (PC), Polyethylenterephthalat (PET), Polyetheretherketon (PEEK) oder Mischungen oder Co-Polymerisate dieser. Die Kunststoffe können übliche Füllstoffe enthalten, beispielsweise Kalziumcarbonat (Kreide), Aluminiumoxid, Kieselgel, Quarzmehl, Holzmehl, Gips. Auch können sie in bekannter Weise eingefärbt sein.Plastics which can be used in the production of corresponding panels are, for example, thermoplastics, such as polyvinyl chloride, polyolefins (for example polyethylene (PE), polypropylene (PP), polyamides (PA), polyurethanes (PU), polystyrene (PS), acrylonitrile). Butadiene-styrene (ABS), polymethyl methacrylate (PMMA), polycarbonate (PC), polyethylene terephthalate (PET), polyetheretherketone (PEEK) or Mixtures or copolymers of these. The plastics may contain conventional fillers, for example calcium carbonate (chalk), alumina, silica gel, quartz flour, wood flour, gypsum. Also, they can be colored in a known manner.

Unter dem Begriff "Direktdruck" wird im Sinne der Erfindung das Aufbringen eines Dekors direkt auf den Träger eines Paneels oder auf eine auf dem Träger aufgebrachte nicht bedruckte Faserwerkstoffschicht verstanden. Entgegen der konventionellen Verfahren, bei welchen auf einen Träger eine zuvor mit einem gewünschten Dekor bedruckte Dekorschicht aufgebracht wird, erfolgt beim Direktdruck das Aufdrucken des Dekors unmittelbar im Zuge der Paneel-Herstellung. Dabei gelangt das Inkjet-Vefahren (Tintenstrahldruckverfahren) zum Einsatz.For the purposes of the invention, the term "direct printing" refers to the application of a decoration directly to the support of a panel or to a non-printed fiber material layer applied to the support. Contrary to the conventional method, in which a previously printed with a desired decor decorative layer is applied to a carrier, the printing of the decoration takes place during direct printing directly in the course of panel production. The inkjet process (inkjet printing process) is used.

Im Sinne der Erfindung sind unter dem Begriff Faserwerkstoffe Materialien wie z.B. Papier und Vliese auf Basis pflanzlicher, tierische, mineralischer oder auch künstlicher Fasern zu verstehen, ebenso wie Pappen. Beispiele sind Faserwerkstoffe aus pflanzlichen Fasern sind neben Papieren und Vliesen aus Zellstofffasern Platten aus Biomasse wie Stroh, Maisstroh, Bambus, Laub, Algenextrakte, Hanf, Baumwolle oder Ölpalmenfasern. Beispiele für tierische Faserwerkstoffe sind keratinbasierte Materialien wie z.B. Wolle oder Rosshaar. Beispiele für mineralische Faserwerkstoffe sind aus Mineralwolle oder Glaswolle.For the purposes of the invention, by the term fiber materials, materials such as e.g. Paper and nonwovens based on vegetable, animal, mineral or even artificial fibers to understand, as well as cardboard. Examples are fibrous materials made of vegetable fibers, in addition to papers and webs of cellulose fibers, plates of biomass such as straw, maize straw, bamboo, leaves, algae extracts, hemp, cotton or oil palm fibers. Examples of animal fiber materials are keratin-based materials such as e.g. Wool or horsehair. Examples of mineral fiber materials are mineral wool or glass wool.

Zum Schutz der aufgebrachten Dekorschicht sind in der Regeln Verschleiß- oder Deckschichten oberhalb der Dekorschicht aufgebracht. Eine Verschleiß- und/oder Deckschicht im Sinne der Erfindung ist eine als äußerer Abschluss aufgebrachte Schicht, welche insbesondere die Dekorschicht vor Abnutzung oder Beschädigung durch Schmutz, Feuchtigkeitseinfluss oder mechanische Einwirkungen wir beispielsweise Abrieb schützt. Dabei kann es vorgesehen sein, dass die Verschleißschicht Hartstoffe wie beispielsweise Titannitrid, Titancarbid, Siliciumnitrid, Siliciumcarbid, Borcarbid, Wolframcarbid, Tantalcarbid, Aluminiumoxid (Korund), Zirconiumoxid oder Mischungen dieser aufweist, um die Verschleißfestigkeit der Schicht zu erhöhen. Dabei kann es vorgesehen sein, dass der Hartstoff in einer Menge zwischen 5 Gew.-% und 40 Gew.-%, vorzugsweise zwischen 15 Gew.-% und 25 Gew.-% in der Verschleißschichtzusammensetzung enthalten ist. Vorzugsweise weist der Hartstoff dabei einen mittleren Korndurchmesser zwischen 10 µm und 250 µm, weiter vorzugsweise zwischen 10µm und 100µm auf. Hierdurch wird vorteilhafter Weise erreicht, dass die Verschleißschichtzusammensetzung eine stabile Dispersion ausbildet und eine Entmischung bzw. ein Absetzten des Hartstoffes in der Verschleißschichtzusammensetzung vermieden werden kann. Zur Ausbildung einer entsprechenden Verschleißschicht ist es in einer Ausgestaltung der Erfindung vorgesehen, dass die Hartstoff enthaltende und strahlungshärtbare Zusammensetzung in einer Konzentration zwischen 10 g/m2 und 250 g/m2, vorzugsweise zwischen 25 g/m2 und 100g/m2 aufgetragen wird. Dabei kann die Auftragung beispielsweise mittels Walzen, wie Gummiwalzen oder mittels Gießvorrichtungen aufgetragen werden. In einer weiteren Ausgestaltung der Erfindung kann es vorgesehen sein, dass der Hartstoff zum Zeitpunkt des Auftrages der Verschleißschichtzusammensetzung nicht in der Zusammensetzung enthalten ist, sondern als Partikel auf die aufgetragenen Verschleißschichtzusammensetzung aufgestreut wird und diese im Anschluss gehärtet wird.To protect the applied decorative layer wear or cover layers are applied above the decorative layer in the rules. A wearing and / or covering layer in the sense of the invention is a layer applied as an outer finish, which in particular protects the decorative layer from abrasion or damage by dirt, moisture or mechanical effects such as abrasion. It may be provided that the wear layer hard materials such as Titanium nitride, titanium carbide, silicon nitride, silicon carbide, boron carbide, tungsten carbide, tantalum carbide, alumina (corundum), zirconium oxide or mixtures thereof to increase the wear resistance of the layer. It may be provided that the hard material in an amount between 5 wt .-% and 40 wt .-%, preferably between 15 wt .-% and 25 wt .-% in the wear layer composition is included. The hard material preferably has an average particle diameter between 10 μm and 250 μm, more preferably between 10 μm and 100 μm. In this way, it is advantageously achieved that the wear layer composition forms a stable dispersion and segregation or settling of the hard material in the wear layer composition can be avoided. To form a corresponding wear layer, it is provided in one embodiment of the invention that the hard material-containing and radiation-curable composition in a concentration between 10 g / m 2 and 250 g / m 2 , preferably between 25 g / m 2 and 100g / m 2 applied becomes. In this case, the application can be applied for example by means of rollers, such as rubber rollers or by means of pouring devices. In a further embodiment of the invention, it may be provided that the hard material is not present in the composition at the time of application of the wear layer composition, but is scattered as particles onto the applied wear layer composition and this is subsequently cured.

Vielfach ist es vorgesehen, dass in solche Verschleiß- oder Deckschichten eine mit dem Dekor übereinstimmende Oberflächenstrukturierung eingebracht ist. Unter einer mit dem Dekor übereinstimmenden Oberflächenstrukturierung ist zu verstehen, dass die Oberfläche des Dekorpaneels eine haptisch wahrnehmbare Struktur aufweist, welche ihrer Form und ihrem Muster dem aufgebrachten Dekor entspricht, um so eine möglichst originalgetreue Nachbildung eines natürlichen Werkstoffes auch hinsichtlich der Haptik zu erhalten. Dabei kann es vorgesehen sein, dass Trägerplatte bereits eine Strukturierung aufweist und eine Ausrichtung eines Druckwerkzeuges zur Aufbringung des Dekors und der Trägerplatte zueinander in Abhängigkeit mittels der mittels optischer Verfahren erfassten Strukturierung der Trägerplatte erfolgt. Zur Ausrichtung des Druckwerkzeuges und der Trägerplatte zueinander kann es dabei vorgesehen sein, das s eine zur Ausrichtung notwendige Relativbewegung zwischen Druckwerkzeug und Trägerplatte zueinander durch eine Verschiebung der Trägerplatte oder durch eine Verschiebung des Druckwerkzeugs erfolgt. Gemäß einer weiteren Ausgestaltung der Erfindung ist es vorgesehen, dass eine Strukturierung der Dekorpaneele nach dem Auftrag der Deck- und/oder Verschleißschicht erfolgt. Hierzu kann es bevorzugt vorgesehen sein, dass als Deck- und/oder Verschleißschicht eine härtbare Zusammensetzung aufgetragen wird und ein Aushärtungsprozess nur in dem Maße erfolgt, dass lediglich eine Teilhärtung der Deck- und/oder Verschleißschicht erfolgt. In die so teilgehärtete Schicht wird mittels geeigneter Werkzeuge, wie beispielsweise einer Hartmetall-Strukturwalz oder eines Stempels, eine gewünschte Oberflächenstruktur eingeprägt. Dabei erfolgt die Prägung in Übereinstimmung mit dem aufgebrachten Dekor. Zur Gewährleistung einer hinreichenden Übereinstimmung der einzubringenden Struktur mit dem Dekor kann es vorgesehen sein, dass die Trägerplatte und das Prägewerkzeug durch entsprechende Relativbewegungen zueinander ausgerichtet werden. Im Anschluss an die Einbringung der gewünschten Struktur in die teilgehärtete Deck- und/oder Verschleißschicht erfolgt eine weitere Härtung der nun strukturierten Deck- und/oder Verschleißschicht.In many cases it is provided that in such wear or cover layers a matching with the decor surface structuring is introduced. Under a matching with the decor surface structuring is to be understood that the surface of the decorative panel has a haptic perceptible structure which corresponds to the shape and pattern of the applied decor, so as to obtain a true to the original reproduction of a natural material also in terms of haptics. It may be provided that the carrier plate already has a structuring and alignment of a printing tool for applying the decoration and the support plate to each other in dependence on the detected by means of optical methods structuring of the carrier plate. For alignment of the pressure tool and the support plate to each other, it may be provided that the s necessary for alignment relative movement between the pressure tool and support plate to each other by a displacement of the support plate or by a displacement of the pressure tool. According to a further embodiment of the invention, it is provided that a structuring of the decorative panels after the application of the cover and / or wear layer takes place. For this purpose, it can preferably be provided that a curable composition is applied as cover and / or wear layer and a curing process takes place only to the extent that only partial hardening of the cover and / or wear layer takes place. In the thus partially cured layer, a desired surface structure is impressed by means of suitable tools, such as a hard metal structural roll or a stamp. The embossing is done in accordance with the applied decor. In order to ensure sufficient conformity of the structure to be introduced with the decor, provision may be made for the carrier plate and the embossing tool to be aligned with one another by corresponding relative movements. Subsequent to the introduction of the desired structure into the partially cured cover and / or wear layer, a further hardening of the now structured covering and / or wear layer takes place.

Ein Problem, welches beim direkten Bedrucken von Dekorpaneelen auftreten kann, ist das im Laufe des Produktionsprozesses eine Verschlechterung des Druckbildes auftritt. In Abhängigkeit des gewählten Druckverfahrens kann es während des Produktionsprozesses zu einer sichtbaren Unschärfe des Druckbildes kommen. Wird beispielsweise ein Inkjet-Verfahren bzw. Tintenstrahlverfahren zur Aufbringung des Dekors verwendet, tritt nach einem gewissen Produktionszeitrum eine deutliche Unschärfe im Dekordruck auf, welche nicht auf etwaige Verschmutzungen des Druckkopfes oder Veränderung der Druckfarbe zurückzuführen ist.A problem that can occur when direct printing on decorative panels, is that during the production process deterioration of the printed image occurs. Depending on the selected printing process, there may be a visible blurring of the printed image during the production process. If, for example, an inkjet method or inkjet method is used to apply the decoration, after a certain production time a clear blurring of the decor pressure occurs, which is not due to any soiling of the print head or change in the printing ink.

Dies berücksichtigend ist es die Aufgabe der vorliegenden Erfindung, eine Vorrichtung und ein Verfahren anzugeben, welche das aus dem Stand der Technik bekannte Problem zu überwinden vermögen.With this in mind, it is the object of the present invention to provide an apparatus and a method which can overcome the problem known from the prior art.

Gelöst wir diese Aufgabe durch eine Vorrichtung gemäß Anspruch 1 sowie ein Verfahren gemäß Anspruch 8. Ausgestaltungen der Erfindung befinden sich in den abhängigen Ansprüchen sowie der weiteren Beschreibung.We solve this object by a device according to claim 1 and a method according to claim 8. Embodiments of the invention are in the dependent claims and the further description.

Mit der Erfindung wird somit eine Paneelbedruckungsvomichtung vorgeschlagen, welche eine Zuführeinrichtung für einen zu bedruckenden Träger und ein Druckwerk aufweist, welche dadurch gekennzeichnet ist, dass die Paneelbedruckungsvomichtung wenigstens eine Einrichtung zur Ableitung elektrostatischer Ladungen aus dem Träger und wenigstens eine hinter der Einrichtung zur Ableitung elektrostatischer Ladungen aus dem Träger angeordnete Einrichtung zur Zuleitung elektrostatischer Ladungen auf den Träger aufweist.The invention thus proposes a panel printing machine comprising a supply means for a support to be printed and a printing unit, characterized in that the panel printing unit comprises at least one means for discharging electrostatic charges from the support and at least one behind the means for discharging electrostatic charges Having arranged from the carrier means for supplying electrostatic charges to the carrier.

Überraschender Weise hat sich gezeigt, dass das Vorsehen einer Einrichtung zur Ableitung elektrostatischer Ladungen aus den zu bedruckenden Trägern in Kombination mit wenigstens einer hinter der Einrichtung zur Ableitung elektrostatischer Ladungen aus dem Träger angeordneten Einrichtung zur Zuleitung elektrostatischer Ladungen auf den Träger geeignet ist, das Auftreten von Unschärfen im Laufe des Produktionsprozesses zu vermeiden. Die sich im Laufe des Produktionsprozesses aufbauende Undefinierte elektrostatische Ladung in den zu bedruckenden Trägern führt zu einer undefinierten Ablenkung der Farb- bzw. Tintentropfen auf Ihrem Weg vom Druckkopf zur zu bedruckenden Oberfläche. Dabei wird davon ausgegangen, dass das sich aufbauende elektrostatische Feld auf den Trägern die in der Regel positiv geladenen Farbpartikel nicht vorhersagbar ablenkt, so dass diese nicht auf dem vorgesehenen Punkt der zu bedruckenden Oberfläche auftreffen. Die so hervorgerufene Ungenauigkeit des Farbauftrags führt zu der wahrnehmbaren Unschärfe des Druckbildes. In Abhängigkeit der Produktionsgeschwindigkeit und des gewählten Trägermaterials tritt dieser Effekt in unterschiedlicher Ausprägung auf, so dass davon ausgegangen wird, dass die Träger, in Abhängigkeit des Trägermaterials, durch den Transport innerhalb der Fertigungsanlage elektrostatisch aufgeladen werden und diese Aufladung hinreichend ist, um den beobachteten Effekt hervorzurufen.Surprisingly, it has been found that the provision of a device for dissipating electrostatic charges from the substrates to be printed in combination with at least one arranged behind the means for discharging electrostatic charges from the carrier device for supplying electrostatic charges to the carrier is suitable, the occurrence of Blurs in the course of the production process to avoid. The undefined electrostatic charge in the substrates to be printed during the production process leads to an undefined deflection of the ink or ink drops on their way from the print head to the surface to be printed. It is assumed that the build-up electrostatic field on the carriers not predictably distracts the generally positively charged color particles, so that they do not impinge on the intended point of the surface to be printed. The thus caused inaccuracy of the ink application leads to the noticeable blurring of the printed image. Depending on the production speed and the selected carrier material this occurs Effect to varying degrees, so that it is assumed that the carriers, depending on the carrier material, are electrostatically charged by the transport within the manufacturing plant and this charge is sufficient to cause the observed effect.

Dadurch, dass eine Einrichtung zur Zuleitung elektrostatischer Ladungen auf den Träger vorgesehen ist, kann durch das Einstellen einer definierten elektrostatischen Ladung des Trägers beziehungsweise insbesondere der Trägeroberfläche das undefinierte Ablenken von Tintentropfen durch eine nicht vorhersagbare elektrostatische Aufladung verhindert werden. Dabei hat sich in überraschender Weise herausgestellt, dass das Druckbild im Vergleich zu einem bloßen Abführen elektrostatischer Ladungen noch weiter verbessert werden kann.By providing a device for supplying electrostatic charges to the carrier, by setting a defined electrostatic charge of the carrier or, in particular, of the carrier surface, the undefined deflection of ink drops can be prevented by an unpredictable electrostatic charge. It has surprisingly been found that the printed image compared to a mere discharge of electrostatic charges can be further improved.

Dadurch, dass die Einrichtung zur Zuleitung elektrostatischer Ladungen auf den Träger hinter, also in Bewegungsrichtung des Trägers nach, einer Einrichtung zur Ableitung elektrostatischer Ladungen aus dem Träger und insbesondere beabstandet zu dieser angeordnet ist, kann dabei eine besonders genaue elektrostatische Aufladung in beziehungsweise auf den Träger aufgebracht werden. Denn dadurch, dass zunächst die elektrostatischen Ladungen vollständig entfernt werden können, kann der Träger eine besonders einheitliche und definierte elektrostatische Ladung beziehungsweise Aufladung beim Drucken aufweisen, da lokale Ladungsspitzen verhindert werden können. Die Art, also positive oder negative Polarität, und Größe der eingebrachten beziehungsweise aufgebrachten Ladung kann dabei in Abhängigkeit des Materials des Trägers und/oder des Druckverfahrens und/oder anderer, Faktoren gewählt werden.Characterized in that the device for supplying electrostatic charges to the carrier behind, ie in the direction of movement of the carrier, a means for dissipating electrostatic charges from the carrier and in particular spaced therefrom, can thereby a particularly accurate electrostatic charge in or on the carrier be applied. Because the fact that initially the electrostatic charges can be completely removed, the carrier may have a particularly uniform and defined electrostatic charge or charge during printing, since local charge peaks can be prevented. The type, ie positive or negative polarity, and size of the charge introduced or applied can be selected depending on the material of the carrier and / or the printing process and / or other factors.

Beispielsweise kann die Einrichtung zur Zuleitung elektrostatischer Ladungen auf den Träger, etwa als Aufladungssystem, einen Ladungsgenerator für positive (+) oder negative (-) Polarität aufweisen und dabei an ein Netzteil beziehungsweise an eine Spannungsversorgung angeschlossen sein, um eine definierte Ladung auf den Träger beziehungsweise die Trägeroberfläche aufzubringen.By way of example, the device for supplying electrostatic charges to the carrier, for example as a charging system, may have a charge generator for positive (+) or negative (-) polarity and in this case to a power supply or to a power supply be connected to apply a defined charge on the carrier or the carrier surface.

Somit kann durch das Vorsehen einer Einrichtung zur Ableitung elektrostatischer Ladungen aus dem zu bedruckenden Träger in Kombination mit wenigstens einer hinter der Eis-wichtung zur Ableitung elektrostatischer Ladungen aus dem Träger angeordneten Einrichtung zur Zuleitung elektrostatischer Ladungen auf den Träger das Druckbild bei einem Direktdruck auf einen Träger signifikant verbessert werden.Thus, by providing a means for dissipating electrostatic charges from the substrate to be printed in combination with at least one downstream of the ice weighting for discharging electrostatic charges from the carrier arranged means for supplying electrostatic charges to the carrier, the printed image at a direct pressure on a carrier be significantly improved.

In einer Ausgestaltung der Erfindung ist es vorgesehen, dass die Einrichtung zur Ableitung elektrostatischer Ladungen aus dem Träger und/oder die Einrichtung zur Zuleitung elektrostatischer Ladungen auf den Träger als eine Leiste ausgestaltet ist, welche eine zu einer Oberfläche des Trägers im Wesentlichen parallel verlaufende und in Richtung des Trägers angeordnete Oberfläche aufweist. Insbesondere kann diese als aktive Lade- beziehungsweise Entladeoberfläche dienende Oberfläche der Leiste über die gesamte Breite des Trägers verlaufen, also im Wesentlichen in einer zu der Bewegungsrichtung des Trägers rechtwinkligen Ausrichtung über die gesamte Ausdehnung des Trägers. Eine zu einer Oberfläche des Trägers im Wesentlichen parallel verlaufende Oberfläche der Leiste kann dabei insbesondere bedeuten, dass die Leiste zumindest in dem elektrostatisch entladenden oder beladenden Bereich im Wesentlichen, also beispielsweise mit einer Abweichung von ≤ 20%, insbesondere ≤10%, beispielsweise ≤1%, einen einheitlichen Abstand zu dem Träger aufweist.In one embodiment of the invention, it is provided that the device for discharging electrostatic charges from the carrier and / or the device for supplying electrostatic charges to the carrier is configured as a bar, which has a substantially parallel to a surface of the carrier and in Direction of the carrier arranged surface. In particular, this surface of the strip serving as an active loading or unloading surface can extend over the entire width of the carrier, ie substantially in a direction at right angles to the direction of movement of the carrier over the entire extent of the carrier. A surface of the strip running essentially parallel to a surface of the carrier may in particular mean that the strip is essentially at least in the electrostatically discharging or loading region, ie for example with a deviation of ≦ 20%, in particular ≦ 10%, for example ≦ 1 %, has a uniform distance to the carrier.

Eine derartige Leiste kann insbesondere ein derartiges Bauteil sein, welches etwa rechteckförmig ausgestaltet ist und beispielsweise zwei plan ausgerichtete Oberflächen aufweist, welche Oberflächen in Richtung des Trägers und in der entgegengesetzten Richtung angeordnet sind. Beispielsweise kann die Einrichtung zur Ableitung elektrostatischer Ladungen aus dem Träger und/oder die Einrichtung zur Zuleitung elektrostatischer Ladungen auf den Träger als plangeschliffene Leiste ausgestaltet sein. Insbesondere in dieser Ausgestaltung können Koronaentladungen vermieden und lokale Ladungsspitzen oder Ladungsveränderungen wirksam verhindert werden, so dass eine Entladung und insbesondere eine elektrostatische Aufladung unter Erzeugung einer hoch gleichmäßigen Ladungsverteilung besonders einheitlich und definiert realisierbar sein können, so dass auch das Druckbild besonders definiert und hochwertig sein kann. Eine elektrostatische Aufladung kann dabei etwa durch das Anlegen einer definierten Spannung an die Leiste realisierbar sein, wobei durch die Art und den Betrag der Spannung die Art und der Betrag der elektrostatischen Aufladung beeinflusst beziehungsweise eingestellt werden kann. Dabei kann durch ein elektrisch leitendes Kontaktieren des sich bewegenden Trägers durch die Leiste eine elektrostatische Aufladung verbessert werden. Entsprechendes gilt für eine elektrostatische Entladung, wobei auch in diesem Fall ein Entladen durch das Anlegen einer Spannung oder durch das Verbinden mit einem elektrischen Massepotential möglich sein kann.Such a strip may in particular be such a component which is approximately rectangular in shape and has, for example, two plane-aligned surfaces, which surfaces are arranged in the direction of the carrier and in the opposite direction. By way of example, the device for discharging electrostatic charges from the carrier and / or the device for supplying electrostatic charges to the carrier can be designed as a ground bar. Especially in this Design corona discharges can be avoided and local charge peaks or charge changes can be effectively prevented, so that a discharge and in particular an electrostatic charge to produce a highly uniform charge distribution can be particularly uniform and defined realizable, so that the printed image can be particularly defined and high quality. An electrostatic charge can be realized, for example, by applying a defined voltage to the strip, wherein the nature and amount of the voltage can influence or set the type and amount of the electrostatic charge. In this case, an electrostatic charging can be improved by an electrically conductive contacting of the moving support through the bar. The same applies to an electrostatic discharge, wherein in this case, a discharge by applying a voltage or by connecting to an electrical ground potential may be possible.

In einer Ausgestaltung der Erfindung ist es vorgesehen, dass die Einrichtung zur Ableitung elektrostatischer Ladungen wenigstens eine Rolle, Bürste oder Lippe aus einem leitfähigen Material aufweist, welche den Träger zumindest im Bereich des Druckwerks elektrisch leitend kontaktiert und welche mit einem elektrischen Massenpotential verbunden ist. Das elektrische Massenpotential kann beispielsweise durch eine Erdung bereitgestellt werden.In one embodiment of the invention, it is provided that the means for discharging electrostatic charges comprises at least one roller, brush or lip made of a conductive material, which electrically contacts the carrier at least in the region of the printing unit and which is connected to an electrical ground potential. The electrical ground potential can be provided for example by a ground.

In einer Ausgestaltung der Erfindung ist es vorgesehen, dass die Ausleitung der elektrostatischen Aufladung über eine Rolle erfolgt, welche Bestandteile der Zuführeinrichtung zum Druckwerk ist. Hierdurch kann eine kompakte Bauweise der Vorrichtung erreicht werden. Gemäß einer besonders bevorzugten Ausgestaltung der Erfindung kann es dabei vorgesehen sein, dass eine Mehrzahl der zum Transport der Träger innerhalb einer Fertigungsstrecke zur Herstellung von Dekorpaneelen derart ausgeführt sind, dass über diese etwaige auftretende elektrostatische Ladungen ausgeleitet werden können.In one embodiment of the invention, it is provided that the discharge of the electrostatic charge takes place via a roller, which is part of the feed device to the printing unit. This allows a compact design of the device can be achieved. According to a particularly preferred embodiment of the invention, it may be provided that a plurality of the transport of the carrier within a manufacturing line for the production of decorative panels are designed such that it can be discharged via this any occurring electrostatic charges.

Die Leiste, Rolle, Bürste oder Lippe ist vorzugsweise zumindest im Kontaktbereich mit dem Träger aus einem Material mit einer Leitfähigkeit ≥ 1*103 Sm-1 gebildet. Insbesondere kann es dabei vorgesehen sein, das s der elektrische Widerstand zwischen Träger und Massenpotential ≤ 0,5 S2, vorzugsweise ≤ 0,05 Ω ist.The strip, roller, brush or lip is preferably formed at least in the contact region with the carrier of a material having a conductivity ≥ 1 * 10 3 Sm -1 . In particular, can it may be provided that the electrical resistance between the carrier and the mass potential is ≦ 0.5 S2, preferably ≦ 0.05 Ω.

Die Leiste, Rolle, Bürste oder Lippe, mittels welcher der Träger kontaktiert wird, kann beispielsweise im Kontaktbereich mit dem Träger aus einem elektrisch leitfähigen Metall wie Stahl, Chrom, Kupfer, Aluminium, Silber oder einer leitfähigen Legierung wie Messing oder Bronze gebildet sein. Gemäß einer weiteren Ausgestaltung der Erfindung besteht die Rolle, Bürste oder Lippe zumindest teilweise aus einem elektrisch leitfähigen Kunststoff. Beispiele für geeignete elektrisch leitfähige Kunststoffe sind Poly-3,4-ethylendioxythiophen, dotiertes Polythiophen, dotiertes Polyethin, Polyanilin und Polypyrrol. Ein Vorteil solcher leitfähiger Kunststoffe gegenüber Metallen ist, dass die Kunststoffe weicher als die Metalle sind, wodurch eine etwaige Beschädigung des Trägers durch verkratzen vermieden werden kann. Alternativ kann es vorgesehen sein, dass die Rolle, Bürste oder Lippe zumindest an den Kontaktstellen mit dem Träger aus einem leitfähigen Gewebe besteht. Dies kann beispielsweise ein Kunststoffgewebe sein, in welches Metallfäden eingewebt sind.The strip, roller, brush or lip, by means of which the carrier is contacted, may for example be formed in the contact region with the carrier of an electrically conductive metal such as steel, chromium, copper, aluminum, silver or a conductive alloy such as brass or bronze. According to a further embodiment of the invention, the roller, brush or lip at least partially made of an electrically conductive plastic. Examples of suitable electrically conductive plastics are poly-3,4-ethylenedioxythiophene, doped polythiophene, doped polyethyne, polyaniline and polypyrrole. An advantage of such conductive plastics over metals is that the plastics are softer than the metals, thereby avoiding any damage to the backing by scratching. Alternatively, it can be provided that the roller, brush or lip consists of a conductive fabric at least at the contact points with the carrier. This can be for example a plastic fabric, in which metal threads are woven.

Gemäß einer weiteren Ausgestaltung der Erfindung kann es vorgesehen sein, dass diese eine dem Druckwerk vorgelagerte Ionisierungseimichtung aufweist, mittels welcher ein ionisierter Luftstrahl über den zu bedruckenden Träger geleitet wird. Es hat sich gezeigt, dass die Beaufschlagung mit ionisierter Luft geeignet ist, das Auftreten von elektrostatischer Aufladung der Träger weiter zu verringern oder zu vergrößern.According to a further embodiment of the invention, it may be provided that this has a printing unit upstream Ionisierungseimichtung by means of which an ionized air jet is passed over the carrier to be printed. It has been found that the exposure to ionized air is suitable for further reducing or increasing the occurrence of electrostatic charging of the carriers.

Gemäß einer besonders bevorzugten Ausgestaltung der Erfindung weist das Druckwerk einen Tintenstrahldruckkopf auf.According to a particularly preferred embodiment of the invention, the printing unit to an inkjet print head.

Hinsichtlich des Verfahrens wird die Aufgabe durch Verfahren zum direkten Bedrucken von Dekorpaneelen, aufweisend die Verfahrensschritte:

  • Bereitstellen eines zu bedruckenden Trägers;
  • Zuführen des Trägers zu einem Druckwerk;
  • Aufdrucken eines Dekors auf den Träger mittels des Druckwerks, welches dadurch gekennzeichnet ist, dass der Träger vor der Zuführung zum Druckwerk und/oder während des Druckvorgangs im Druckwerk mit Mitteln zur Veränderung der elektrostatischen Aufladung des Trägers behandelt wird, indem der Träger zunächst elektrostatisch entladen wird und dem Träger anschließend ein definierter Ladungsbetrag zugeführt wird.
With regard to the method, the object is achieved by methods for direct printing of decorative panels, comprising the method steps:
  • Providing a support to be printed;
  • Feeding the carrier to a printing unit;
  • Printing a decoration on the carrier by means of the printing unit, which is characterized in that the carrier is treated before being supplied to the printing unit and / or during the printing process in the printing unit with means for varying the electrostatic charge of the carrier by the carrier is first discharged electrostatically and the carrier then a defined amount of charge is supplied.

Bezüglich der technischen Merkmale und Vorteile des Verfahrens wird hiermit vollumfänglich auf die Beschreibung der Vorrichtung verwiesen und umgekehrt.With regard to the technical features and advantages of the method, reference is hereby made in full to the description of the device and vice versa.

Gemäß einer Ausgestaltung des Verfahrens wird eine Entladung in einem Bereich von größer oder gleich 7kV, insbesondere größer oder gleich 10kV, beispielsweise in einem Bereich von größer oder gleich 7kV bis kleiner oder gleich 15kV, durchgeführt. Alternativ oder zusätzlich kann eine elektrostatische Aufladung in einem Bereich von größer 0kV bis kleiner oder gleich 15 kV, beispielsweise bis kleiner oder gleich 10 kV, unabhängig von der Art der Ladung, durchgeführt werden. Es hat sich überraschender Weise gezeigt, dass insbesondere ein Entladen um einen vorbeschriebene Ladungsbetrag und/oder eine Beladung um einen vorbeschriebenen Ladungsbetrag zu einem besonders guten Druckbild führen kann.According to one embodiment of the method, a discharge is carried out in a range of greater than or equal to 7 kV, in particular greater than or equal to 10 kV, for example in a range of greater than or equal to 7 kV to less than or equal to 15 kV. Alternatively or additionally, an electrostatic charge in a range of greater than 0 kV to less than or equal to 15 kV, for example, to less than or equal to 10 kV, regardless of the type of charge, are performed. It has surprisingly been found that in particular a discharge by a prescribed amount of charge and / or a loading by a prescribed amount of charge can lead to a particularly good print image.

Gemäß einer Ausgestaltung des Verfahrens umfassen die Mittel zur Verringerung der elektrostatischen Aufladung die elektrisch leitfähige Kontaktierung des Trägers mit einem Massenpotential. Hierzu kann es vorgesehen sein, dass die Kontaktierung des Trägers mittels einer Leiste, Rolle, Bürste oder Lippe aus einem Material mit einer elektrischen Leitfähigkeit ≥ 1*103 Sm-1 erfolgt.According to one embodiment of the method, the means for reducing the electrostatic charge comprise the electrically conductive contacting of the carrier with a ground potential. For this purpose, it may be provided that the contacting of the carrier by means of a bar, roller, brush or lip made of a material having an electrical conductivity ≥ 1 * 10 3 Sm -1 .

Gemäß einer weiteren Ausgestaltung des erfindungsgemäßen Verfahrens kann es vorgesehen sein, dass der Träger vor und/oder während der Zuführung zum Druckwerk mit einem ionisierten Luftstrom beaufschlagt wird. Es hat sich gezeigt, dass die Beaufschlagung mit einem ionisierten Luftstrom geeignet ist, eine elektrostatische Aufladung in den Trägern signifikant zu verringern oder vergrößern.According to a further embodiment of the method according to the invention, it can be provided that the carrier is subjected to an ionized air flow before and / or during the feed to the printing unit. It has been shown that the admission with an ionized air stream is capable of significantly reducing or increasing an electrostatic charge in the carriers.

Die Erfindung wird nachfolgend anhand einer Figur weiter erläutert.The invention will be explained below with reference to a figure.

Fig. 1 zeigt eine Paneelbedruckungsvorrichtung 100. Die Vorrichtung 100 weist eine Zuführeinrichtung 110 für einen zu bedruckenden Träger 600 auf, mittels welcher der Träger 600 einem Druckwerk 120 zugeführt wird. Das Druckwerk 120 umfasst einen Tintenstrahldruckkopf, welcher über ein Rechnersystem gesteuert ein Dekorbild auf den Träger 600 aufbringt. Die Vorrichtung 100 weist eine Einrichtung 130 zur Ableitung elektrostatischer Ladungen aus dem Träger 600 auf, welche etwa den Träger 600 berühren kann, und weist ferner eine hinter der Einrichtung 130 zur Ableitung elektrostatischer Ladungen aus dem Träger 600 angeordnete Einrichtung 170 zur Zuleitung elektrostatischer Ladungen auf den Träger 600 auf, welche ebenfalls den Träger 600 berühren kann. Die Einrichtung 130 und die Einrichtung 170 sind dabei im Bereich der Zuführeinrichtung 110 angeordnet und aus einer rechteckförmigen Leiste aus einem leitfähigen Material gebildet, wobei die Ableiteinrichtung 130 durch eine Erdung 150 mit einem Massenpotential verbunden ist und die Einleiteinrichtung 170 mit einem Netzteil 180 beziehungsweise mit einer Spannungsquelle verbunden ist. Fig. 1 1 shows a panel printing device 100. The device 100 has a feed device 110 for a carrier 600 to be printed, by means of which the carrier 600 is fed to a printing unit 120. The printing unit 120 comprises an inkjet printhead which, under the control of a computer system, applies a decorative image to the carrier 600. The device 100 has a device 130 for discharging electrostatic charges from the carrier 600, which may touch the carrier 600 approximately, and further comprises a means disposed behind the device 130 for discharging electrostatic charges from the carrier 600 means 170 for supplying electrostatic charges on the Carrier 600, which can also touch the carrier 600. The device 130 and the device 170 are arranged in the region of the feed device 110 and formed from a rectangular strip of a conductive material, wherein the discharge device 130 is connected by a ground 150 to a ground potential and the lead-in 170 with a power supply 180 or with a Voltage source is connected.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

100100
PaneelbedruckungsvorrichtungPaneelbedruckungsvorrichtung
110110
Zuführeinrichtungfeeding
120120
Druckwerkprinting unit
130130
Ableiteinrichtungdiverter
150150
Erdunggrounding
170170
Einleiteinrichtunginducer
180180
Netzteilpower adapter
600600
Trägercarrier

Claims (13)

  1. Panel printing device (100) comprising a supply means (110) for a carrier (600) to be printed and a printing unit (120) for an inkjet process, wherein
    the panel printing device (100) comprises at least one means (130) for discharging electrostatic charges from the carrier (600),
    characterized in that
    the panel printing device (100) further comprises at least one means (170) for supplying electrostatic charges onto the carrier (600) disposed downstream of the means (130) for discharging electrostatic charges from the carrier (600).
  2. Device according to claim 1, characterized in that the means (130) for discharging electrostatic charges from the carrier (600) and/or the means (170) for supplying electrostatic charges onto the carrier (600) is configured as a bar, which comprises a surface which extends substantially parallel to a surface of the carrier (600) and is arranged in the direction of the carrier (600).
  3. Device according to claim 1, wherein the means (130) for discharging electrostatic charges comprises at least one roller, brush or lip made of a conductive material which electrically conductive contacts the carrier (600) at least in the area of the printing unit (120) and which is connected to an electrical ground potential.
  4. Device according to claim 2 or 3, wherein the bar, the roller, the brush or the lip at least in the contact area with the carrier is formed of a material having a conductivity ≥ 1*103 Sm-1.
  5. Device according to any one of claims 2 to 4, wherein the bar, the roller, the brush or the lip at least partially is made of an electrically conductive plastic material.
  6. Device according to any one of the preceding claims, wherein the device comprises an ionization means (140) which is disposed upstream of the printing unit (120) and by means of which an ionized air flow is passed over the carrier (600) to be printed.
  7. Device according to any one of the preceding claims, wherein the printing unit (120) comprises an inkjet printhead.
  8. Method for direct printing decorative panels, including an inkjet process comprising the process steps of:
    - providing a carrier (600) to be printed;
    - supplying the carrier (600) to a printing unit (120);
    - printing a decoration onto the carrier (600) by means of the printing unit (120), wherein
    the carrier (600) prior to being supplied to the printing unit (120) and/or during the printing process in the printing unit (120) is treated by means for changing the electrostatic charging of the carrier (600) by initially electrostatically discharging the carrier (600) and subsequently supplying a defined charge amount to the carrier (600).
  9. Method according to claim 8, characterized in that a discharge is carried out in a range of greater than or equal 7 kV.
  10. Method according to claim 8 or 9, characterized in that the electrostatic charge is carried out in a range of greater 0 kV to less than or equal to 15 kV.
  11. Method according to any one of claims 8 to 10, wherein the means for reducing the electrostatic charge includes electrically conductive contacting of the carrier (600) to a ground potential.
  12. Method according to any one of claims 8 to 11, wherein the contacting of the carrier is realized by means of a rectangular bar, roller, brush or lip of a material having an electric conductivity ≥ 1*103Sm-1.
  13. Method according to any of one of claims 8 to 12, wherein the carrier (600) prior to and/or during its supply to the printing unit (120) is exposed to an ionized air flow.
EP13771162.8A 2012-10-04 2013-10-02 Device and method for improved direct printing of decorative panels Active EP2755827B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PL13771162T PL2755827T3 (en) 2012-10-04 2013-10-02 Device and method for improved direct printing of decorative panels
EP13771162.8A EP2755827B1 (en) 2012-10-04 2013-10-02 Device and method for improved direct printing of decorative panels

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP12187205.5A EP2716462B1 (en) 2012-10-04 2012-10-04 Device and method for improved direct printing of decorative panels
PCT/EP2013/070586 WO2014053569A1 (en) 2012-10-04 2013-10-02 Device and method for improved direct printing of décor panels
EP13771162.8A EP2755827B1 (en) 2012-10-04 2013-10-02 Device and method for improved direct printing of decorative panels

Publications (2)

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EP2755827A1 EP2755827A1 (en) 2014-07-23
EP2755827B1 true EP2755827B1 (en) 2016-12-07

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US (1) US9132671B2 (en)
EP (2) EP2716462B1 (en)
JP (1) JP2015508337A (en)
KR (1) KR20140090146A (en)
AU (1) AU2013311107B2 (en)
BR (1) BR112014008110B1 (en)
CA (1) CA2850605C (en)
CL (1) CL2014000598A1 (en)
ES (2) ES2630017T3 (en)
MX (1) MX2014004919A (en)
MY (1) MY170987A (en)
PL (2) PL2716462T3 (en)
PT (2) PT2716462T (en)
RU (1) RU2563215C1 (en)
UA (1) UA110285C2 (en)
WO (1) WO2014053569A1 (en)

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Publication number Publication date
WO2014053569A1 (en) 2014-04-10
PL2755827T3 (en) 2017-06-30
ES2630017T3 (en) 2017-08-17
PT2716462T (en) 2017-07-11
KR20140090146A (en) 2014-07-16
AU2013311107A1 (en) 2014-04-24
BR112014008110A2 (en) 2017-04-11
CA2850605C (en) 2016-04-12
CA2850605A1 (en) 2014-04-10
RU2563215C1 (en) 2015-09-20
PL2716462T3 (en) 2017-09-29
US9132671B2 (en) 2015-09-15
US20140285604A1 (en) 2014-09-25
MY170987A (en) 2019-09-23
EP2755827A1 (en) 2014-07-23
MX2014004919A (en) 2014-07-16
BR112014008110B1 (en) 2021-10-13
EP2716462B1 (en) 2017-04-19
JP2015508337A (en) 2015-03-19
CN103842180A (en) 2014-06-04
UA110285C2 (en) 2015-12-10
AU2013311107B2 (en) 2015-07-23
ES2615079T3 (en) 2017-06-05
EP2716462A1 (en) 2014-04-09
CL2014000598A1 (en) 2014-11-21
PT2755827T (en) 2017-02-14

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