EP2838671B1 - Method and apparatus for producing a structured varnish surface - Google Patents

Method and apparatus for producing a structured varnish surface Download PDF

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Publication number
EP2838671B1
EP2838671B1 EP13707412.6A EP13707412A EP2838671B1 EP 2838671 B1 EP2838671 B1 EP 2838671B1 EP 13707412 A EP13707412 A EP 13707412A EP 2838671 B1 EP2838671 B1 EP 2838671B1
Authority
EP
European Patent Office
Prior art keywords
applicator roll
varnish
structured
decoration
substrate board
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.)
Active
Application number
EP13707412.6A
Other languages
German (de)
French (fr)
Other versions
EP2838671A1 (en
Inventor
André Wiegelmann
Royce Dodds
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.)
Fritz Egger GmbH and Co OG
Original Assignee
Fritz Egger GmbH and Co OG
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 Fritz Egger GmbH and Co OG filed Critical Fritz Egger GmbH and Co OG
Priority to PL13707412T priority Critical patent/PL2838671T3/en
Publication of EP2838671A1 publication Critical patent/EP2838671A1/en
Application granted granted Critical
Publication of EP2838671B1 publication Critical patent/EP2838671B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/06—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to wood
    • B05D7/08—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to wood using synthetic lacquers or varnishes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/28—Processes for applying liquids or other fluent materials performed by transfer from the surfaces of elements carrying the liquid or other fluent material, e.g. brushes, pads, rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/04—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases
    • B05D3/0406—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases the gas being air
    • B05D3/042—Directing or stopping the fluid to be coated with air
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/02—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain a matt or rough surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/50—Multilayers
    • B05D7/56—Three layers or more
    • B05D7/57—Three layers or more the last layer being a clear coat
    • B05D7/576—Three layers or more the last layer being a clear coat each layer being cured, at least partially, separately
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/40—Distributing applied liquids or other fluent materials by members moving relatively to surface
    • B05D1/42—Distributing applied liquids or other fluent materials by members moving relatively to surface by non-rotary members
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2203/00—Other substrates
    • B05D2203/20—Wood or similar material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2601/00—Inorganic fillers
    • B05D2601/20—Inorganic fillers used for non-pigmentation effect
    • B05D2601/26—Abrasives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/06—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain multicolour or other optical effects
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
    • E04F15/00—Flooring
    • E04F15/02—Flooring or floor layers composed of a number of similar elements

Definitions

  • the invention relates to a method for producing a structured, at least partially optically transparent lacquer surface on a decorative surface of a support plate, preferably a wood-based panel, in the transparent or at least partially transparent lacquer applied to the application of the structured lacquer surface on an applicator roll and by means of the applicator roll the decor having a surface of the carrier plate is transmitted. Furthermore, the invention relates to a device for producing a structured, at least partially optically transparent lacquer surface on a surface of a carrier plate having a decoration, with an applicator roll for transferring a structured lacquer surface onto the surface of the carrier plate having a decoration.
  • WO 2006/002917 A2 a method for producing a wood-based panel having a decorative surface is described.
  • an already ground, provided with a decor, especially wood decor surface of the wood-based panel is primed, then smoothed and then printed directly to produce the decor by means of pressure rollers (printing cylinder) in gravure printing.
  • the decor paper or the decoration directly printed on the support plate is provided with a transparent sealing layer.
  • the sealing layer of the decorative surfaces thus produced is usually patterned so that it finally has a three-dimensional surface structure.
  • the three-dimensional structure improves the haptic effect of the decorative surface.
  • the haptic impression, which causes the structured decorative surface thus corresponds to the surface texture to be imitated, for example, a porous wood surface.
  • Structured press plates, structured press belts or embossing rollers are used in the prior art for producing structured surfaces on wood-based panels provided with a decor. Furthermore, this also structured lacquer application rollers are used.
  • the production of these sheets, strips and rolls is associated with considerable costs.
  • a change of these sheets, strips and rolls is very time-consuming, which is in the case of a single production plant to be made on the wood-based panels with different decors and correspondingly different surface structures, is a disadvantage.
  • the printheads work according to a blasting technique, as used by Inkjet printers is known. They are arranged for this purpose in one or more rows transversely to the feed direction of the workpiece and at a relatively small distance above it (see. DE 10 2009 044 802 A1 and EP 2 218 520 A2 ).
  • the EP 2 275 261 A1 discloses a method for printing rigid workpieces with a pattern, preferably with a woodgrain decor, in which the pattern is applied to a soft set surface applicator roll by digital printing and the pattern by rolling the applicator roll on an already structured or profiled surface of a Workpiece, for example, a profiled skirting board is transmitted.
  • An apparatus and a method is known, with which an image is applied by means of radiation energy curable ink by means of ink jet nozzles applied to an intermediate substrate, for example in the form of an applicator roll, pre-dried by means of radiation energy and then transferred to a receiving substrate.
  • the present invention has the object to provide a method and an apparatus of the type mentioned, which avoid the disadvantages mentioned above.
  • the method according to the invention is characterized in that the lacquer is converted by means of a plurality of digitally controlled gas nozzles on the applicator roll into a distribution defining a structure. Accordingly, the device according to the invention is provided with a plurality of digitally controlled gas nozzles, which are designed to transform a transparent or at least partially transparent lacquer, which was applied in the form of a lacquer film on the applicator roll on the applicator roll into a structure defining distribution.
  • gas jets areas in the paint film are displaced by means of gas jets, so that a three-dimensional structure is formed.
  • a plurality of gas nozzles e.g. Compressed air nozzles, preferably arranged in several rows along the applicator roll axis and independently controllable.
  • the nozzles of adjacent rows are preferably arranged axially offset from one another.
  • the solution according to the invention in which a film of at least partially transparent lacquer applied to the applicator roll is transformed into a distribution defining a three-dimensional structure by means of digitally controlled gas nozzles, eg compressed air nozzles or gas or compressed air jets, has several advantages over digital printing heads operating according to the inkjet printing technique , A considerable advantage is in particular that gas nozzles (eg compressed air nozzles) are not susceptible to wear compared to paint jet print heads or are hardly subject to wear and thus are very easy to maintain. In the case of paint-jet print heads, on the other hand, there is a considerable risk of clogging. Also, their susceptibility to wear is relatively high.
  • the targeted local displacement of a paint film applied to the applicator roll by means of gas or compressed air blasting according to the solution according to the invention makes it possible to add abrasion resistance-increasing particles in that for producing the three-dimensional surface structure used paint.
  • a preferred embodiment of the invention accordingly provides that the paint contains hard particles, preferably corundum particles.
  • the use of a lacquer containing hard particles is scarcely possible because of the resulting increased printhead wear and the risk of clogging.
  • suitable digital gas or compressed-air nozzles can be obtained considerably more cost-effectively than digital paint-jet print heads.
  • tests have shown that the inventive solution characterized by the use of digital gas or compressed air nozzles enables significantly higher printing speeds than an embodiment which exclusively uses conventional paint jet printing heads.
  • the nozzles are not arranged according to the invention at a small distance above the plate-shaped workpiece, but the order of the structured paint surface on the applicator roll, the nozzles are protected from collisions that can occur in their arrangement at a small distance above the plate-shaped workpiece when the plate-shaped Workpieces are uneven, for example, dished, or foreign bodies are present on the workpieces.
  • the solution according to the invention basically enables the production of an "endless", non-repeating three-dimensional surface structure. which can be produced by the method according to the invention is practically limited only by the maximum length of the plate-shaped workpiece.
  • the present invention enables the use of a smooth standard application roller, ie an applicator roller, which has a smooth or slightly structured lateral surface, typically regularly structured lateral surface.
  • a smooth standard application roller is considerably less expensive than a structured press plate or an engraved paint applicator roll.
  • a preferred embodiment of the invention provides that the paint is formed into such a distribution on the applicator roll, that the resulting from this distribution structure of the generated on the surface of the support plate structured paint surface defined pores that match the decor image of the decor. In this way, results on the plate-shaped workpiece, a three-dimensional surface structure, which is tailored to the decor, such as a wood decor, tile decor or natural stone decor.
  • a further preferred embodiment of the invention provides that prior to the transfer of the paint on the support plate, the decor image of the decor or attached to the support plate control mark is detected by means of an optical scanning and measuring signals generated by the scanning device to control the digitally controlled nozzles are used.
  • the decor preferably wood decor
  • the printheads are controlled by a computer or the like such that the decorative image as a whole or at least one decorative image area varies according to a random principle.
  • a further advantageous embodiment of the invention is characterized in that compressed air nozzles are used as digitally controlled gas nozzles. By means of such compressed air nozzles can be applied to the applicator roll film of at least partially transparent paint in a three-dimensional structure defining distribution. In this case, areas in the paint film are displaced by means of compressed air jets, so that a three-dimensional structure is formed.
  • a further advantageous embodiment of the invention is characterized in that the paint applied to the applicator roll is predried or precured on the same, or that the applicator roll is a radiation source or heating device which is adapted to pre-dry or pre-cure the paint applied to the applicator roll thereon. This makes it possible to counteract bleeding (deliquescence) of the three-dimensional lacquer structure produced on the applicator roll, as a result of which the resolution of the structured lacquer surface produced on the plate-shaped workpiece can be improved.
  • a further preferred embodiment of the invention provides that the applicator roller is rubberized and / or formed cambered. This embodiment also contributes to the improvement of the resolution of the structured paint surface produced on the plate-shaped workpieces.
  • An applicator roll shell consisting of rubber or a rubber-like material counteracts deliquescence of the lacquer structure produced on the applicator roll and can compensate for unevenness of the plate-shaped workpiece to be printed.
  • a cambered design of the applicator roll favors the achievement of a uniform coating structure height distribution across the width of the applicator roll.
  • Fig. 1 is a device or plant for the production of plate-shaped products, such as furniture panels or floor, wall or ceiling panels, with a decor having a surface represented.
  • a plurality of plate-shaped workpieces 1 are arranged on a conveyor belt 2, which are individually fed successively different processing stations 3,4, 5 and 6.
  • the feed direction of the workpieces 2 is indicated by an arrow and extends from left to right.
  • a large-area workpiece or an endlessly produced workpiece can be processed, which is divided into individual plates (blanks) after the processing described below.
  • the conveyor belt or feed rate of the workpieces 1 is for example in the range of 1 to 120 m / min.
  • the plate-shaped workpiece 1 serves as a carrier and can therefore also be referred to as a carrier plate.
  • the workpiece or the carrier plate 1 is made of wood material, of laminate and / or of at least one compact plate.
  • Compact panels are made of resin-impregnated cellulosic sheets, which are pressed under high pressure and at high temperatures in laminate presses.
  • the carrier plates 1 are ground wood-based panels, for example chipboard, medium density fiberboard (MDF), high density fiberboard (HDF) or hardboard.
  • filler is preferably applied by means of (not shown) application rollers filler, wherein an intermediate drying takes place after each stage.
  • a primer held in the basic color of a subsequently printed decoration is then again applied in several stages by means of rollers (not shown), partial drying taking place again after each application.
  • the primed support plate 1 is preferably smoothed. This is done, for example, by means of heated, polished steel rollers (not shown), which are pressed against the carrier plate 1 at a circumferential rotational speed which is greater or lower than the feed rate of the carrier plates 1, over the width of the carrier plate 1.
  • the thus treated support plate 1 then has over its entire upper surface in a color, gloss level and structure even or uniform surface.
  • a decor for example, a wood, natural stone or tile decor printed.
  • the printing of the decorative image is preferably carried out by means of one or more printing roller units 3.1, 4.1.
  • the respective printing cylinder unit 3.1.4.1 is typically constructed from an engraved printing cylinder (printing cylinder) 3.11.4.11 with inking and dampening rollers and a blanket cylinder 3.12, 4.12 with an impression cylinder. This printing process is also referred to as indirect gravure printing.
  • a digital printer device (not shown), in particular an inkjet printing device, can be used to print a desired decorative image on the carrier plates 1.
  • the digital printer device is preferably controlled in such a way that the decorative image is varied in such a way that no or practically no carrier plates 1 with identical decorative images are produced.
  • the digital printer device is connected, for example, to a computer, which determines the size, shape and / or position of one or more decorative picture elements, eg the image of a wood grain, of kernel and sapwood, of a branch, of resinous galls, measles tubers, annual rings, Feeding gears (eg woodworm holes / gangways), nail and / or screw heads, etc., varies at random and controls the digital printheads of the printer device accordingly.
  • a computer determines the size, shape and / or position of one or more decorative picture elements, eg the image of a wood grain, of kernel and sapwood, of a branch, of resinous galls, measles tubers, annual rings, Feeding gears (eg woodworm holes / gangways), nail and / or screw heads, etc., varies at random and controls the digital printheads of the printer device accordingly.
  • the respective printer device 3.2.4.2 can, for example, by means of a hot air stream or by means of a high-energy and / or electromagnetic radiation, in particular UV radiation drying or partial drying of the printed decor image cause.
  • At least one processing station 5 by means of which a sealing layer (wear protection layer) is applied to the decor, follows optionally on the digital printer device or the printing drum unit 4.1 or the post-processing device 4.2.
  • a sealing layer wear protection layer
  • a UV-curable, transparent lacquer coating is preferably applied in at least two stages.
  • the sealing lacquer may contain corundum particles and / or other abrasion-resistant particles. If the decorative panels 1 to be produced are those which are not subjected to high abrasion stress, for example furniture parts, in particular cabinet back panels, then the sealing lacquer may also be free from corundum particles or other abrasion-resistant particles.
  • the sealing lacquer may also contain further additives, for example the scratch-resistance-increasing additives and / or antistatic agents.
  • a substantially full-surface coating of a UV-curable, transparent sealing lacquer is applied.
  • the processing station 5 an applicator roll 5.1, which applies a uniform layer of paint on top of the printed with the decor support plate 1.
  • the applied coating is at least partially dried and cured.
  • the decorative image was preferably coated with a transparent seal, an at least partially optically transparent, three-dimensionally structured resist layer 1.1 is applied in a further processing station 6.
  • This is done according to the invention indirectly by means of a plurality of digitally controlled nozzles 6.1 in combination with an applicator roller 6.2.
  • the lacquer used for this purpose is preferably a UV-curable lacquer.
  • the last applied lacquer layer 1.1 is at least partially cured, so that the three-dimensional structure is fixed. 1 'denotes the finished coated carrier plate.
  • the processing station 6 for producing the structured, at least partially optically transparent lacquer surface 1.1 can be realized in various embodiments.
  • the application roller 6.2 a plurality of digitally controlled nozzles 6.1 in the form of printheads (paint spray nozzles) assigned.
  • the nozzles or printheads 6.1 are arranged in at least one row and preferably cover the complete roll width (axial roll length).
  • the print heads 6.1 of a row are preferably offset from the printheads 6.1 'of the print head row extending parallel thereto, ie arranged in the gaps between the print heads of the print head row extending parallel thereto.
  • the lateral surface of the application roller 6.2 is formed substantially smooth or slightly structured.
  • the application roller 6.2 is preferably gummed and cambered.
  • the three-dimensional structure is thus not printed directly on carrier plate 1, but digitally on applicator roller 6.2, which then transfers the printed structure onto carrier plate 1,
  • the digital control commands for generating the structure can be present in a data record matching the decorative image or are calculated or generated on the basis of the decorative image read by means of an optical scanning device (not shown).
  • an optical scanning device for example by means of a camera system (not shown) locates the decorative image on the support plate 1 and calculated or determined the zero point for printing the roll shell of the applicator roll 6.2. In this way it can be ensured that the generated three-dimensional paint surface 1.1 with the paint pores therein to the decorative image, for example, a wooden decorative image on the support plate 1 fits. In professional circles, this also refers to a "synchronous paint pore" or "synchronous surface structure".
  • Fig. 3 an embodiment of the device according to the invention is outlined.
  • the paint for the production of the surface structure is not applied by means of paint jet print heads (paint spray nozzles), but by means of a metering roller 6.4 and / or a doctor blade (not shown) on the applicator roll 6.2.
  • the metering roller 6.4 or doctor blade generates on the applicator roller 6.2 a paint film 6.5 with a defined layer thickness.
  • the paint film 6.5 is then partially displaced on the application roller 6.2 by means of gas jets, preferably compressed air jets, and thus converted into a three-dimensional structure.
  • gas jets preferably compressed air jets
  • digitally controlled gas nozzles or compressed-air nozzles 6.1 are arranged above and / or on the application roller 6.2.
  • the nozzles 6.1 are arranged in at least one row, which extends over the roll width, ie along the axis of rotation of Application roller extends.
  • several rows of nozzles are present (see. Fig. 1 ; 6.1, 6.1 '), which define a digitally switchable nozzle grid.
  • the lacquer-receiving lateral surface area of the application roller 6.2 is in turn substantially smooth or slightly structured.
  • the applicator roll is preferably rubberized and / or cambered formed.
  • the applicator roller 6.2 is preceded by an optical scanning device (not shown) in the feed direction of the carrier plate 1, which detects the decorative image or a control mark attached to the carrier plate 1.
  • the scanning device is connected to a control device (not shown) which digitally controls the nozzles 6.1, 6.1 'as a function of the measuring signals generated by the scanning device.
  • the application roller 6.2 may be associated with a radiation source or heating device 6.6, which is designed to pre-dry or pre-cure the paint applied to the application roller 6.2 and structured on the same.
  • the embodiment of the invention is not limited to the embodiments described above. Rather, numerous variants are conceivable, which make use even with fundamentally different design of the invention specified in the appended claims.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Description

Die Erfindung betrifft ein Verfahren zur Herstellung einer strukturierten, zumindest teilweise optisch transparenten Lackoberfläche auf einer ein Dekor aufweisenden Oberfläche einer Trägerplatte, vorzugsweise einer Holzwerkstoffplatte, bei dem transparenter oder zumindest teilweise transparenter Lack zur Erzeugung der strukturierten Lackoberfläche auf eine Auftragswalze aufgebracht und mittels der Auftragswalze auf die ein Dekor aufweisende Oberfläche der Trägerplatte übertragen wird. Ferner betrifft die Erfindung ein Vorrichtung zur Herstellung einer strukturierten, zumindest teilweise optisch transparenten Lackoberfläche auf einer ein Dekor aufweisenden Oberfläche einer Trägerplatte, mit einer Auftragswalze zum Übertragen einer strukturierten Lackoberfläche auf die ein Dekor aufweisende Oberfläche der Trägerplatte.The invention relates to a method for producing a structured, at least partially optically transparent lacquer surface on a decorative surface of a support plate, preferably a wood-based panel, in the transparent or at least partially transparent lacquer applied to the application of the structured lacquer surface on an applicator roll and by means of the applicator roll the decor having a surface of the carrier plate is transmitted. Furthermore, the invention relates to a device for producing a structured, at least partially optically transparent lacquer surface on a surface of a carrier plate having a decoration, with an applicator roll for transferring a structured lacquer surface onto the surface of the carrier plate having a decoration.

Zur Herstellung von Fußboden-, Wand- oder Deckenpaneelen und Möbelbauplatten mit dekorativen Oberflächen existieren verschiedene Verfahren. Neben Verfahren, bei dem dekorative Oberflächen auf Holzwerkstoffplatten durch Beschichten derselben mit bedruckten, harzgetränkten Papieren (Dekorpapieren) hergestellt werden, sind auch Verfahren zum direkten Aufdrucken eines Dekors, insbesondere Holzdekors, auf Holzwerkstoffplatten bekannt.For the production of floor, wall or ceiling panels and furniture panels with decorative surfaces exist various methods. In addition to methods in which decorative surfaces are produced on wood-based panels by coating them with printed, resin-impregnated papers (decorative papers), methods for directly printing a decoration, in particular wood decor, on wood-based panels are also known.

Zum Beispiel ist in der auf die Anmelderin zurückgehenden WO 2006/002917 A2 ein Verfahren zum Herstellen einer Holzwerkstoffplatte mit einer ein Dekor aufweisenden Oberfläche beschrieben. Bei diesem bekannten Verfahren wird eine bereits geschliffene, mit einem Dekor, insbesondere Holzdekor zu versehene Oberfläche der Holzwerkstoffplatte grundiert, danach geglättet und anschließend zum Erzeugen des Dekors mittels Druckwalzen (Druckzylinder) im Tiefdruckverfahren direkt bedruckt.For example, in the Applicant's case WO 2006/002917 A2 a method for producing a wood-based panel having a decorative surface is described. In this known method, an already ground, provided with a decor, especially wood decor surface of the wood-based panel is primed, then smoothed and then printed directly to produce the decor by means of pressure rollers (printing cylinder) in gravure printing.

Zum Herstellen von Paneelen mit dekorativen Oberflächen werden neben Walzendruckverfahren auch Digitaldruckverfahren verwendet. So ist zum Beispiel aus der WO 98/26936 A1 ein Verfahren zum Herstellen von harzgetränkten Dekorpapieren zur Beschichtung von Trägerplatten bekannt. Dabei wird ein Papier mittels eines Digitaldruckers, insbesondere Laserdruckers bedruckt. Das Dekorpapier wird in einer Heißpresse, z.B. einer Kurztaktpresse, auf die Trägerplatte aufgepresst, wobei das Harz, mit dem das Papier imprägniert worden ist, ausgehärtet wird. Die mit dem Dekorpapier beschichteten Trägerplatten (Laminate) sind insbesondere für den Möbelbau bestimmt.For the production of panels with decorative surfaces, in addition to roller printing processes, digital printing processes are also used. So is for example from the WO 98/26936 A1 a method for producing resin-impregnated decorative paper for coating carrier plates known. In this case, a paper is printed by means of a digital printer, in particular laser printer. The decorative paper is pressed onto the carrier plate in a hot press, eg a short-cycle press, whereby the resin with which the paper has been impregnated is cured. The coated with the decor paper backing plates (laminates) are intended especially for furniture.

Um das Dekor vor Abriebverschleiß zu schützen, wird das Dekorpapier bzw. das auf die Trägerplatte direkt aufgedruckte Dekor mit einer transparenten Versiegelungsschicht versehen. Die Versiegelungsschicht der so hergestellten dekorativen Oberflächen wird üblicherweise strukturiert, so dass sie schließlich eine dreidimensionale Oberflächenstruktur aufweist. Die dreidimensionale Struktur verbessert die haptische Wirkung der dekorativen Oberfläche. Der haptische Eindruck, den die strukturierte dekorative Oberfläche bewirkt, entspricht somit der zu imitierenden Oberflächenbeschaffenheit, beispielsweise einer porigen Holzoberfläche.In order to protect the decor from abrasion wear, the decor paper or the decoration directly printed on the support plate is provided with a transparent sealing layer. The sealing layer of the decorative surfaces thus produced is usually patterned so that it finally has a three-dimensional surface structure. The three-dimensional structure improves the haptic effect of the decorative surface. The haptic impression, which causes the structured decorative surface, thus corresponds to the surface texture to be imitated, for example, a porous wood surface.

Zur Herstellung strukturierter Oberflächen auf mit einem Dekor versehenen Holzwerkstoffplatten werden im Stand der Technik strukturierte Pressbleche, strukturierte Pressbänder oder Prägewalzen verwendet. Des Weiteren werden hierzu auch strukturierte Lackauftragswalzen verwendet. Die Herstellung dieser Bleche, Bänder und Walzen ist mit erheblichen Kosten verbunden. Zudem ist ein Wechsel dieser Bleche, Bänder und Walzen sehr zeitaufwendig, was im Falle einer einzelnen Produktionsanlage, auf der Holzwerkstoffplatten mit unterschiedlichen Dekoren und entsprechend unterschiedlichen Oberflächenstrukturen hergestellt werden sollen, von Nachteil ist.Structured press plates, structured press belts or embossing rollers are used in the prior art for producing structured surfaces on wood-based panels provided with a decor. Furthermore, this also structured lacquer application rollers are used. The production of these sheets, strips and rolls is associated with considerable costs. In addition, a change of these sheets, strips and rolls is very time-consuming, which is in the case of a single production plant to be made on the wood-based panels with different decors and correspondingly different surface structures, is a disadvantage.

Zur Lösung dieses Problems wurde vorgeschlagen, die Oberflächenstrukturen durch direkten Lackauftrag auf die plattenförmigen Werkstücke mittels digitaler Druckköpfe zu erzeugen. Die Druckköpfe arbeiten dabei nach einer Strahldrucktechnik, wie sie von Tintenstrahldruckern bekannt ist. Sie werden hierzu in einer oder mehreren Reihen quer zur Vorschubrichtung des Werkstücks und in relativ geringem Abstand oberhalb desselben angeordnet (vgl. DE 10 2009 044 802 A1 und EP 2 218 520 A2 ).To solve this problem, it has been proposed to produce the surface structures by direct application of paint to the plate-shaped workpieces by means of digital printheads. The printheads work according to a blasting technique, as used by Inkjet printers is known. They are arranged for this purpose in one or more rows transversely to the feed direction of the workpiece and at a relatively small distance above it (see. DE 10 2009 044 802 A1 and EP 2 218 520 A2 ).

Ein Problem beim Betrieb dieser bekannten digitalen Auftragsvorrichtungen besteht jedoch in der Gefahr von Kollisionen, die an den digitalen Druckköpfen bei Unebenheiten der plattenförmigen Werkstücke, beispielsweise bei einer Schüsselung der Platten, und/oder bei Fremdkörpern auf den Platten auftreten können.However, a problem in the operation of these known digital application devices is the risk of collisions that can occur on the digital printheads in the case of unevenness of the plate-shaped workpieces, for example when the plates are bowed, and / or when there are foreign objects on the plates.

Die EP 2 275 261 A1 offenbart ein Verfahren zum Bedrucken von starren Werkstücken mit einem Muster, vorzugsweise mit einem Holzmaserungs-Dekor, bei dem das Muster auf eine eine weich eingestellte Oberfläche aufweisende Auftragswalze durch digitalen Aufdruck aufgebracht und das Muster durch Abrollen der Auftragswalze auf eine bereits strukturierte oder profilierte Oberfläche eines Werkstückes, beispielsweise einer profilierten Fußbodenleiste übertragen wird.The EP 2 275 261 A1 discloses a method for printing rigid workpieces with a pattern, preferably with a woodgrain decor, in which the pattern is applied to a soft set surface applicator roll by digital printing and the pattern by rolling the applicator roll on an already structured or profiled surface of a Workpiece, for example, a profiled skirting board is transmitted.

Des Weiteren sind aus der GB 2 322 597 A eine Vorrichtung und ein Verfahren bekannt, mit der bzw. bei dem ein Bild unter Verwendung von durch Strahlungsenergie härtbarer Tinte mittels Tintenstrahldüsen auf ein Zwischensubstrat, z.B. in Form einer Auftragswalze aufgebracht, mittels Strahlungsenergie vorgetrocknet und anschließend auf ein Empfangssubstrat übertragen wird.Furthermore, from the GB 2 322 597 A An apparatus and a method is known, with which an image is applied by means of radiation energy curable ink by means of ink jet nozzles applied to an intermediate substrate, for example in the form of an applicator roll, pre-dried by means of radiation energy and then transferred to a receiving substrate.

Davon ausgehend lag der vorliegenden Erfindung die Aufgabe zugrunde, ein Verfahren und eine Vorrichtung der eingangs genannten Art anzugeben, die die oben genannten Nachteile vermeiden.Based on this, the present invention has the object to provide a method and an apparatus of the type mentioned, which avoid the disadvantages mentioned above.

Zur Lösung dieser Aufgabe werden ein Verfahren mit den Merkmalen des Anspruchs 1 und eine Vorrichtung mit den Merkmalen des Anspruchs 10 vorgeschlagen.To solve this problem, a method having the features of claim 1 and a device having the features of claim 10 are proposed.

Das erfindungsgemäße Verfahren ist dadurch gekennzeichnet, dass der Lack mittels einer Vielzahl digital gesteuerter Gasdüsen auf der Auftragswalze in eine eine Struktur definierende Verteilung umgeformt wird.
Dementsprechend ist die erfindungsgemäße Vorrichtung mit einer Vielzahl digital gesteuerter Gasüsen versehen, die ausgebildet sind, um einen transparenten oder zumindest teilweise transparenten Lack, der in Form eines Lackfilms auf die Auftragswalze aufgetragen wurde, auf der Auftragswalze in eine eine Struktur definierende Verteilung umzuformen.The method according to the invention is characterized in that the lacquer is converted by means of a plurality of digitally controlled gas nozzles on the applicator roll into a distribution defining a structure.
Accordingly, the device according to the invention is provided with a plurality of digitally controlled gas nozzles, which are designed to transform a transparent or at least partially transparent lacquer, which was applied in the form of a lacquer film on the applicator roll on the applicator roll into a structure defining distribution.

Dabei werden Bereiche in dem Lackfilm mittels Gasstrahlen verdrängt, so dass eine dreidimensionale Struktur entsteht. Hierzu sind eine Vielzahl von Gasdüsen, z.B. Druckluftdüsen, vorzugsweise in mehreren Reihen entlang der Auftragswalzenachse angeordnet und unabhängig voneinander ansteuerbar. Die Düsen benachbarter Reihen sind dabei vorzugsweise axial versetzt zueinander angeordnet. In jedem Fall wird so ermöglicht, dass die von den Düsen erzeugten Gas- oder Luftstrahlen in einem schaltbaren Raster auf die Auftragswalze bzw. einen darauf aufgebrachten Lackfilm einwirken können.In this case, areas in the paint film are displaced by means of gas jets, so that a three-dimensional structure is formed. For this purpose, a plurality of gas nozzles, e.g. Compressed air nozzles, preferably arranged in several rows along the applicator roll axis and independently controllable. The nozzles of adjacent rows are preferably arranged axially offset from one another. In any case, it is thus made possible that the gas or air jets generated by the nozzles can act on the application roller or a paint film applied thereto in a switchable grid.

Die erfindungsgemäße Lösung, bei der ein auf die Auftragswalze aufgetragener Film aus zumindest teilweise transparentem Lack in eine eine dreidimensionale Struktur definierende Verteilung mittels digital gesteuerter Gasdüsen, z.B. Druckluftdüsen, bzw. Gas- oder Druckluftstrahlen umgeformt wird, hat gegenüber nach der Tintenstrahldrucktechnik arbeitenden Digitaldruckköpfen mehrere Vorteile. Ein erheblicher Vorteil besteht insbesondere darin, dass Gasdüsen (z.B. Druckluftdüsen) im Vergleich zu Lackstrahldruckköpfen nicht verschleißanfällig sind bzw. kaum einem Verschleiß unterliegen und somit sehr wartungsfreundlich sind. Bei Lackstrahldruckköpfen besteht dagegen eine erhebliche Verstopfungsgefahr. Auch ist ihre Verschleißanfälligkeit relativ hoch. Die gezielte örtliche Verdrängung eines auf die Auftragswalze aufgetragenen Lackfilms mittels Gas- oder Druckluftstrahlen gemäß der erfindungsgemäßen Lösung ermöglicht den Zusatz von die Abriebfestigkeit erhöhenden Partikeln in dem zur Herstellung der dreidimensionalen Oberflächenstruktur verwendeten Lack. Eine bevorzugte Ausgestaltung der Erfindung sieht dementsprechend vor, dass der Lack Hartpartikel, vorzugsweise Korundpartikel enthält. Bei Lackstrahldruckköpfen ist dagegen die Verwendung eines Hartpartikel enthaltenden Lackes wegen des dadurch erhöhten Druckkopfverschleißes und der Verstopfungsgefahr kaum möglich. Ferner sind für die erfindungsgemäße Lösungsvariante geeignete digitale Gas- oder Druckluftdüsen erheblich kostengünstiger erhältlich als digitale Lackstrahldruckköpfe. Des Weiteren haben Versuche gezeigt, dass die durch die Verwendung digitaler Gas- oder Druckluftdüsen gekennzeichnete erfindungsgemäße Lösung deutlich höhere Druckgeschwindigkeiten ermöglicht als eine ausschließlich herkömmliche Lackstrahldruckköpfe verwendende Ausführungsform.The solution according to the invention, in which a film of at least partially transparent lacquer applied to the applicator roll is transformed into a distribution defining a three-dimensional structure by means of digitally controlled gas nozzles, eg compressed air nozzles or gas or compressed air jets, has several advantages over digital printing heads operating according to the inkjet printing technique , A considerable advantage is in particular that gas nozzles (eg compressed air nozzles) are not susceptible to wear compared to paint jet print heads or are hardly subject to wear and thus are very easy to maintain. In the case of paint-jet print heads, on the other hand, there is a considerable risk of clogging. Also, their susceptibility to wear is relatively high. The targeted local displacement of a paint film applied to the applicator roll by means of gas or compressed air blasting according to the solution according to the invention makes it possible to add abrasion resistance-increasing particles in that for producing the three-dimensional surface structure used paint. A preferred embodiment of the invention accordingly provides that the paint contains hard particles, preferably corundum particles. In the case of paint jet printheads, on the other hand, the use of a lacquer containing hard particles is scarcely possible because of the resulting increased printhead wear and the risk of clogging. Furthermore, for the solution variant according to the invention, suitable digital gas or compressed-air nozzles can be obtained considerably more cost-effectively than digital paint-jet print heads. Furthermore, tests have shown that the inventive solution characterized by the use of digital gas or compressed air nozzles enables significantly higher printing speeds than an embodiment which exclusively uses conventional paint jet printing heads.

Da die Düsen erfindungsgemäß nicht in geringem Abstand oberhalb des plattenförmigen Werkstücks angeordnet sind, sondern der Auftrag der strukturierten Lackoberfläche über die Auftragswalze erfolgt, sind die Düsen vor Kollisionen geschützt, die bei ihrer Anordnung in geringem Abstand oberhalb des plattenförmigen Werkstücks auftreten können, wenn die plattenförmigen Werkstücke uneben, beispielsweise geschüsselt sind, oder Fremdkörper auf den Werkstücken vorhanden sind.Since the nozzles are not arranged according to the invention at a small distance above the plate-shaped workpiece, but the order of the structured paint surface on the applicator roll, the nozzles are protected from collisions that can occur in their arrangement at a small distance above the plate-shaped workpiece when the plate-shaped Workpieces are uneven, for example, dished, or foreign bodies are present on the workpieces.

Während es insbesondere bei der Verwendung von strukturierten Prägewalzen typischerweise zu einer Wiederholung der damit erzeugbaren Oberflächenstruktur auf dem plattenförmigen Werkstück kommt, ermöglicht die erfindungsgemäße Lösung im Grunde die Herstellung einer "endlosen", sich nicht wiederholenden dreidimensionalen Oberflächenstruktur, Die Länge einer keine Wiederholungen aufweisenden Oberflächenstruktur, die sich nach dem erfindungsgemäßen Verfahren herstellen lässt, ist praktisch nur durch die maximale Länge des plattenförmigen Werkstücks begrenzt.While the surface structure which can be produced on the plate-shaped workpiece is typically repeated using structured embossing rollers, the solution according to the invention basically enables the production of an "endless", non-repeating three-dimensional surface structure. which can be produced by the method according to the invention is practically limited only by the maximum length of the plate-shaped workpiece.

Zudem ermöglicht die vorliegende Erfindung die Verwendung einer glatten Standard-Auftragswalze, d.h. einer Auftragswalze, die eine glatte oder leicht strukturierte Mantelfläche, typischerweise regelmäßig strukturierte Mantelfläche aufweist. Eine solche glatte Standard-Auftragswalze ist erheblich kostengünstiger als ein strukturiertes Pressblech oder eine gravierte Lackauftragswalze.In addition, the present invention enables the use of a smooth standard application roller, ie an applicator roller, which has a smooth or slightly structured lateral surface, typically regularly structured lateral surface. Such a smooth standard application roller is considerably less expensive than a structured press plate or an engraved paint applicator roll.

Eine bevorzugte Ausgestaltung der Erfindung sieht vor, dass der Lack in eine solche Verteilung auf der Auftragswalze umgeformt wird, dass die aus dieser Verteilung resultierende Struktur der auf der Oberfläche der Trägerplatte erzeugten strukturierten Lackoberfläche Poren definiert, die zu dem Dekorbild des Dekors passen. Auf diese Weise ergibt sich auf dem plattenförmigen Werkstück eine dreidimensionale Oberflächenstruktur, die auf das Dekor, beispielsweise ein Holzdekor, Fliesendekor oder Natursteindekor abgestimmt ist.A preferred embodiment of the invention provides that the paint is formed into such a distribution on the applicator roll, that the resulting from this distribution structure of the generated on the surface of the support plate structured paint surface defined pores that match the decor image of the decor. In this way, results on the plate-shaped workpiece, a three-dimensional surface structure, which is tailored to the decor, such as a wood decor, tile decor or natural stone decor.

Eine weitere bevorzugte Ausgestaltung der Erfindung sieht vor, dass vor der Übertragung des Lacks auf die Trägerplatte das Dekorbild des Dekors oder eine auf der Trägerplatte angebrachte Steuermarke mittels einer optischen Abtastvorrichtung erfasst wird und von der Abtastvorrichtung erzeugte Messsignale zur Steuerung der digital gesteuerten Düsen genutzt werden. Auf diese Weise lässt sich eine automatische Anpassung der dreidimensionalen Oberflächenstruktur an das Dekorbild insbesondere auch dann erzielen, wenn sich das Dekorbild selbst nach einem Zufallsprinzip ändert. Beispielsweise kann das Dekor, vorzugsweise Holzdekor, erfindungsgemäß mittels einer digitale Druckköpfe, insbesondere Tintenstrahldruckköpfe aufweisenden Druckervorrichtung aufgedruckt werden, wobei die Druckköpfe von einem Computer oder dergleichen derart angesteuert werden, dass das Dekorbild als Ganzes oder mindestens ein Dekorbildbereich nach einem Zufallsprinzip variiert.A further preferred embodiment of the invention provides that prior to the transfer of the paint on the support plate, the decor image of the decor or attached to the support plate control mark is detected by means of an optical scanning and measuring signals generated by the scanning device to control the digitally controlled nozzles are used. In this way, an automatic adaptation of the three-dimensional surface structure to the decorative image can be achieved, in particular, even if the decorative image changes itself according to a random principle. For example, the decor, preferably wood decor, according to the invention by means of a digital printheads, in particular inkjet printheads having printer device to be printed, the printheads are controlled by a computer or the like such that the decorative image as a whole or at least one decorative image area varies according to a random principle.

Eine weitere vorteilhafte Ausgestaltung der Erfindung ist dadurch gekennzeichnet, dass als digital gesteuerte Gasdüsen Druckluftdüsen verwendet werden. Mittels solcher Druckluftdüsen lässt sich ein auf die Auftragswalze aufgetragener Film aus zumindest teilweise transparentem Lack in eine eine dreidimensionale Struktur definierende Verteilung umformen. Dabei werden Bereiche in dem Lackfilm mittels Druckluftstrahlen verdrängt, so dass eine dreidimensionale Struktur entsteht.
Eine weitere vorteilhafte Ausgestaltung der Erfindung ist dadurch gekennzeichnet, dass der auf die Auftragswalze aufgetragene Lack auf derselben vorgetrocknet oder vorgehärtet wird, bzw. dass der Auftragswalze eine Strahlenquelle oder Heizvorrichtung zugeordnet wird, die ausgebildet ist, um den auf die Auftragswalze aufgetragenen Lack auf derselben vorzutrocknen oder vorzuhärten. Hierdurch lässt sich einem Verlaufen (Zerfließen) der auf der Auftragswalze erzeugten dreidimensionalen Lackstruktur entgegenwirken, wodurch die Auflösung der auf dem plattenförmigen Werkstück hergestellten strukturierten Lackoberfläche verbessert werden kann.A further advantageous embodiment of the invention is characterized in that compressed air nozzles are used as digitally controlled gas nozzles. By means of such compressed air nozzles can be applied to the applicator roll film of at least partially transparent paint in a three-dimensional structure defining distribution. In this case, areas in the paint film are displaced by means of compressed air jets, so that a three-dimensional structure is formed.
A further advantageous embodiment of the invention is characterized in that the paint applied to the applicator roll is predried or precured on the same, or that the applicator roll is a radiation source or heating device which is adapted to pre-dry or pre-cure the paint applied to the applicator roll thereon. This makes it possible to counteract bleeding (deliquescence) of the three-dimensional lacquer structure produced on the applicator roll, as a result of which the resolution of the structured lacquer surface produced on the plate-shaped workpiece can be improved.

Eine weitere bevorzugte Ausgestaltung der Erfindung sieht vor, dass die Auftragswalze gummiert und/oder bombiert ausgebildet ist. Diese Ausgestaltung trägt ebenfalls zur Verbesserung der Auflösung der auf den plattenförmigen Werkstücken hergestellten strukturierten Lackoberfläche bei. Ein aus Gummi oder einem gummiartigen Werkstoff bestehender Auftragswalzenmantel wirkt einem Zerfließen der auf der Auftragswalze erzeugten Lackstruktur entgegen und kann Unebenheiten des zu bedruckenden plattenförmigen Werkstücks kompensieren. Eine bombierte Ausgestaltung der Auftragswalze begünstigt die Erzielung einer gleichmäßigen Lackstrukturhöhenverteilung über die Breite der Auftragswalze.A further preferred embodiment of the invention provides that the applicator roller is rubberized and / or formed cambered. This embodiment also contributes to the improvement of the resolution of the structured paint surface produced on the plate-shaped workpieces. An applicator roll shell consisting of rubber or a rubber-like material counteracts deliquescence of the lacquer structure produced on the applicator roll and can compensate for unevenness of the plate-shaped workpiece to be printed. A cambered design of the applicator roll favors the achievement of a uniform coating structure height distribution across the width of the applicator roll.

Weitere bevorzugte und vorteilhafte Ausgestaltungen der Erfindung ergeben sich aus den Unteransprüchen.Further preferred and advantageous embodiments of the invention will become apparent from the dependent claims.

Nachfolgend wird die Erfindung anhand einer verschiedene Ausführungsbeispiele darstellenden Zeichnung näher erläutert. Es zeigen schematisch:

Fig. 1
eine mehrere Druckstationen aufweisende Vorrichtung bzw. Anlage zur Herstellung plattenförmiger Produkte mit einer ein Dekor aufweisenden Oberfläche, in Seitenansicht;
Fig. 2
eine Auftragsvorrichtung; und
Fig. 3
ein Ausführungsbeispiel einer erfindungsgemäßen Auftragsvorrichtung.
The invention will be explained in more detail with reference to a drawing illustrating various embodiments. They show schematically:
Fig. 1
a plurality of printing stations having apparatus or plant for the production of plate-shaped products with a decorative surface having, in side view;
Fig. 2
an applicator; and
Fig. 3
An embodiment of an applicator device according to the invention.

In Fig. 1 ist eine Vorrichtung bzw. Anlage zur Herstellung von plattenförmigen Produkten, beispielsweise von Möbelbauplatten oder Fußboden-, Wand- oder Deckenpaneelen, mit einer ein Dekor aufweisenden Oberfläche, dargestellt.In Fig. 1 is a device or plant for the production of plate-shaped products, such as furniture panels or floor, wall or ceiling panels, with a decor having a surface represented.

Mehrere plattenförmige Werkstücke 1 sind auf einem Förderband 2 angeordnet, die einzeln der Reihe nach verschiedenen Bearbeitungsstationen 3,4, 5 und 6 zugeführt werden. Die Vorschubrichtung der Werkstücke 2 ist mit einem Pfeil angedeutet und verläuft von links nach rechts. Anstelle mehrerer einzelner Werkstücke 1 kann auch ein großflächiges Werkstück oder ein endlos hergestelltes Werkstück bearbeitet werden, das nach der im Folgenden beschriebenen Bearbeitung in einzelne Platten (Zuschnitte) zerteilt wird. Die Förderband- bzw. Vorschubgeschwindigkeit der Werkstücke 1 liegt beispielsweise im Bereich von 1 bis 120 m/min.A plurality of plate-shaped workpieces 1 are arranged on a conveyor belt 2, which are individually fed successively different processing stations 3,4, 5 and 6. The feed direction of the workpieces 2 is indicated by an arrow and extends from left to right. Instead of a plurality of individual workpieces 1, a large-area workpiece or an endlessly produced workpiece can be processed, which is divided into individual plates (blanks) after the processing described below. The conveyor belt or feed rate of the workpieces 1 is for example in the range of 1 to 120 m / min.

Das plattenförmige Werkstück 1 dient als Träger und kann daher auch als Trägerplatte bezeichnet werden.The plate-shaped workpiece 1 serves as a carrier and can therefore also be referred to as a carrier plate.

Das Werkstück oder die Trägerplatte 1 ist aus Holzwerkstoff, aus Schichtstoff und/oder aus mindestens einer Compactplatte hergestellt. Compactplatten werden aus harzgetränkten Zellulosebahnen hergestellt, die unter großem Druck und bei hohen Temperaturen in Laminatpressen verpresst werden. Vorzugsweise handelt es sich bei den Trägerplatten 1 jedoch um geschliffene Holzwerkstoffplatten, beispielsweise um Spanplatten, mitteldichte Faserplatten (MDF-Platten), hochdichte Faserplatten (HDF-Platten) oder Hartfaserplatten.The workpiece or the carrier plate 1 is made of wood material, of laminate and / or of at least one compact plate. Compact panels are made of resin-impregnated cellulosic sheets, which are pressed under high pressure and at high temperatures in laminate presses. Preferably, however, the carrier plates 1 are ground wood-based panels, for example chipboard, medium density fiberboard (MDF), high density fiberboard (HDF) or hardboard.

Nach einer optionalen (nicht dargestellten) Bürststation, die etwaige Verunreinigungen oder Schleifstaub entfernt, wird vorzugsweise mittels (nicht gezeigter) Auftragswalzen mehrstufig Füller aufgebracht, wobei nach jeder Stufe eine Zwischentrocknung erfolgt. Auf die so vorliegende Trägerplatte 1 wird dann wiederum mehrstufig eine im Grundfarbton eines nachfolgend aufgedruckten Dekors gehaltene Grundierung mittels (nicht gezeigter) Walzen aufgetragen, wobei wieder nach jedem Auftrag eine teilweise Trocknung erfolgt.After an optional (not shown) brushing station, which removes any impurities or grinding dust, filler is preferably applied by means of (not shown) application rollers filler, wherein an intermediate drying takes place after each stage. On the support plate 1 thus present, a primer held in the basic color of a subsequently printed decoration is then again applied in several stages by means of rollers (not shown), partial drying taking place again after each application.

Sodann wird die grundierte Trägerplatte 1 vorzugsweise geglättet. Dies erfolgt beispielsweise mittels beheizter, polierter Stahlwalzen (nicht gezeigt), die unter Anpressen gegen die Trägerplatte 1 mit einer Umfangsdrehgeschwindigkeit, welche größer oder niedriger als die Vorschubgeschwindigkeit der Trägerplatten 1 ist, über die Breite der Trägerplatte 1 betrieben werden. Die so behandelte Trägerplatte 1 weist dann über ihre gesamte Oberseite eine in Farbe, Glanzgrad und Struktur ebene bzw. gleichmäßige Oberfläche auf.Then, the primed support plate 1 is preferably smoothed. This is done, for example, by means of heated, polished steel rollers (not shown), which are pressed against the carrier plate 1 at a circumferential rotational speed which is greater or lower than the feed rate of the carrier plates 1, over the width of the carrier plate 1. The thus treated support plate 1 then has over its entire upper surface in a color, gloss level and structure even or uniform surface.

Unmittelbar an die optionale (nicht dargestellte) Glättvorrichtung wird auf die Trägerplatte 1 ein Dekor (Dekorbild), beispielsweise ein Holz-, Naturstein- oder Fliesendekor aufgedruckt. Das Aufdrucken des Dekorbildes erfolgt vorzugsweise mittels eines oder mehrerer Druckwalzenwerke 3.1, 4.1. Das jeweilige Druckwalzenwerk 3.1,4.1 ist typischerweise aus einer gravierten Druckwalze (Druckzylinder) 3.11,4.11 mit Farb- und Feuchtwalzen und einem Gummituchzylinder 3.12, 4.12 mit Gegendruckzylinder aufgebaut. Dieses Druckverfahren wird auch als indirekter Tiefdruck bezeichnet.Immediately to the optional (not shown) smoothing device is on the support plate 1, a decor (decorative image), for example, a wood, natural stone or tile decor printed. The printing of the decorative image is preferably carried out by means of one or more printing roller units 3.1, 4.1. The respective printing cylinder unit 3.1.4.1 is typically constructed from an engraved printing cylinder (printing cylinder) 3.11.4.11 with inking and dampening rollers and a blanket cylinder 3.12, 4.12 with an impression cylinder. This printing process is also referred to as indirect gravure printing.

Anstelle eines oder mehrerer Druckwalzenwerke 3.1, 4.1 kann erfindungsgemäß auch eine digitale Druckervorrichtung (nicht gezeigt), insbesondere eine Tintenstrahldruckvorrichtung, verwendet werden, um ein gewünschtes Dekorbild auf die Trägerplatten 1 aufzudrucken. Die digitale Druckervorrichtung wird vorzugsweise so angesteuert, dass das Dekorbild derart variiert wird, dass keine oder praktisch keine Trägerplatten 1 mit identischen Dekorbildern erzeugt werden. Hierzu ist die digitale Druckervorrichtung beispielsweise an einem Computer angeschlossen, der die Größe, Form und/oder Position eines oder mehrerer Dekorbildelemente, z.B. das Bild einer Holzmaserung, von Kern- und Splintholz, eines Astes (Astquerschnittes), von Harzgallen, Maserknollen, Jahresringen, Fraßgängen (z.B. Holzwurmlöcher/-gänge), Nagel- und/oder Schraubköpfen, etc., nach dem Zufallsprinzip variiert und die digitalen Druckköpfe der Druckervorrichtung entsprechend ansteuert.Instead of one or more printing cylinder units 3.1, 4.1, according to the invention, a digital printer device (not shown), in particular an inkjet printing device, can be used to print a desired decorative image on the carrier plates 1. The digital printer device is preferably controlled in such a way that the decorative image is varied in such a way that no or practically no carrier plates 1 with identical decorative images are produced. For this purpose, the digital printer device is connected, for example, to a computer, which determines the size, shape and / or position of one or more decorative picture elements, eg the image of a wood grain, of kernel and sapwood, of a branch, of resinous galls, measles tubers, annual rings, Feeding gears (eg woodworm holes / gangways), nail and / or screw heads, etc., varies at random and controls the digital printheads of the printer device accordingly.

Der digitalen Druckervorrichtung bzw. den Druckwalzenwerken 3.1, 4.1 sind Nachbearbeitungsvorrichtungen 3.2,4.2 nachgeordnet, Die jeweilige Nachbearbeitungsvorrichtung 3.2,4.2 kann beispielsweise mittels eines Warmluftstroms oder mittels einer energiereichen und/oder elektromagnetischen Strahlung, insbesondere UV-Strahlung eine Trocknung bzw. Teiltrocknung des aufgedruckten Dekorbildes bewirken.The respective printer device 3.2.4.2 can, for example, by means of a hot air stream or by means of a high-energy and / or electromagnetic radiation, in particular UV radiation drying or partial drying of the printed decor image cause.

Auf die digitale Druckervorrichtung oder das Druckwalzenwerk 4.1 bzw. die Nachbearbeitungsvorrichtung 4.2 folgt optional mindestens eine Bearbeitungsstation 5, mittels der auf das Dekor eine Versiegelungsschicht (Verschleißschutzschicht) aufgebracht wird.Optionally, at least one processing station 5, by means of which a sealing layer (wear protection layer) is applied to the decor, follows optionally on the digital printer device or the printing drum unit 4.1 or the post-processing device 4.2.

Als Versiegelung des Dekors wird vorzugsweise eine mit UV-Strahlung härtbare, transparente Lackbeschichtung in mindestens zwei Stufen aufgebracht. Der Versiegelungslack kann Korundpartikel und/oder andere die Abriebfestigkeit erhöhende Partikel enthalten. Handelt es sich bei den herzustellenden dekorativen Platten 1 um solche, die keiner hohen Abriebbeanspruchung ausgesetzt werden, beispielsweise um Möbelteile, insbesondere um Rückwände für Schränke, so kann der Versiegelungslack auch frei von Korundpartikeln oder sonstigen die Abriebfestigkeit erhöhenden Partikeln sein. Alternativ oder ergänzend zu Abriebfestigkeit erhöhenden Partikeln kann der Versiegelungslack noch weitere Additive enthalten, beispielsweise die Kratzfestigkeit erhöhende Additive und/oder Antistatika.As a seal of the decoration, a UV-curable, transparent lacquer coating is preferably applied in at least two stages. The sealing lacquer may contain corundum particles and / or other abrasion-resistant particles. If the decorative panels 1 to be produced are those which are not subjected to high abrasion stress, for example furniture parts, in particular cabinet back panels, then the sealing lacquer may also be free from corundum particles or other abrasion-resistant particles. As an alternative or in addition to abrasion resistance-increasing particles, the sealing lacquer may also contain further additives, for example the scratch-resistance-increasing additives and / or antistatic agents.

In der Bearbeitungsstation 5 wird eine im Wesentlichen vollflächige Beschichtung aus einem UV-härtbaren, transparenten Versiegelungslack aufgebracht. Hierzu weist die Bearbeitungsstation 5 eine Auftragswalze 5.1 auf, die eine gleichmäßige Schicht aus Lack auf die Oberseite der mit dem Dekor bedruckten Trägerplatte 1 aufbringt. In der nachgeschalteten Nachbearbeitungsvorrichtung 5.2 wird die aufgebrachte Beschichtung zumindest teilweise getrocknet und ausgehärtet.In the processing station 5, a substantially full-surface coating of a UV-curable, transparent sealing lacquer is applied. For this purpose, the processing station 5 an applicator roll 5.1, which applies a uniform layer of paint on top of the printed with the decor support plate 1. In the downstream post-processing device 5.2, the applied coating is at least partially dried and cured.

Auf die das Dekor aufweisenden Oberfläche der Trägerplatte 1, deren Dekorbild vorzugsweise mit einer transparenten Versiegelung beschichtet wurde, wird in einer weiteren Bearbeitungsstation 6 eine zumindest teilweise optisch transparente, dreidimensional strukturierte Lackschicht 1.1 aufgetragen. Dies erfolgt erfindungsgemäß indirekt mittels einer Vielzahl digital gesteuerter Düsen 6.1 in Kombination mit einer Auftragswalze 6.2. Der hierzu verwendete Lack ist vorzugsweise ein UV-härtbarer Lack.On the decor having the surface of the support plate 1, the decorative image was preferably coated with a transparent seal, an at least partially optically transparent, three-dimensionally structured resist layer 1.1 is applied in a further processing station 6. This is done according to the invention indirectly by means of a plurality of digitally controlled nozzles 6.1 in combination with an applicator roller 6.2. The lacquer used for this purpose is preferably a UV-curable lacquer.

Mittels einer auf die Auftragswalze 6.2 folgenden Nachbearbeitungsvorrichtung 6.3 wird dann die zuletzt aufgebrachte Lackschicht 1.1 zumindest teilweise ausgehärtet, so dass die dreidimensionale Struktur fixiert ist. Mit 1' ist die fertig beschichtete Trägerplatte bezeichnet. Die Bearbeitungsstation 6 zur Herstellung der strukturierten, zumindest teilweise optisch transparenten Lackoberfläche 1.1 kann in verschiedenen Ausführungsformen realisiert werden.By means of a subsequent to the application roller 6.2 post-processing device 6.3 then the last applied lacquer layer 1.1 is at least partially cured, so that the three-dimensional structure is fixed. 1 'denotes the finished coated carrier plate. The processing station 6 for producing the structured, at least partially optically transparent lacquer surface 1.1 can be realized in various embodiments.

Bei dem in Fig. 2 dargestellten Ausführungsbeispiel sind der Auftragswalze 6.2 eine Vielzahl von digital gesteuerten Düsen 6.1 in Form von Druckköpfen (Lackstrahldüsen) zugeordnet. Die Düsen bzw. Druckköpfe 6.1 sind in mindestens einer Reihe angeordnet und decken vorzugsweise die komplette Walzenbreite (axiale Walzenlänge) ab. Je nach gewünschter Druckgeschwindigkeit können auch mehrere Reihen von Druckköpfen vorgesehen sein, was in den Figuren 1 und 2 durch eine gepunktete Druckkopfreihe angedeutet ist. Die Druckköpfe 6.1 einer Reihe sind dabei vorzugsweise versetzt zu den Druckköpfen 6.1' der parallel dazu verlaufenden Druckkopfreihe, d.h. in den Lücken zwischen den Druckköpfen der parallel dazu verlaufenden Druckkopfreihe angeordnet. Die Druckköpfe 6.1, 6.1' sind in einem geringen Abstand über der Auftragswalze 6.2 positioniert, wohingegen die Auftragswalze 6.2 durch Kontakt den aufgedruckten Strukturlack an die Trägerplatte 1 abgibt. Die Mantelfläche der Auftragswalze 6.2 ist im Wesentlichen glatt oder leicht strukturiert ausgebildet. Des Weiteren ist die Auftragswalze 6.2 vorzugsweise gummiert und bombiert. Durch die Bombierung, d.h. die gezielte fassartige Verdickung der Auftragswalze 6.2 zu ihrer Mitte hin, wird die Durchbiegung der Walze 6.2, die bei einer rein zylindrisch geformten Walze zu einer über die Breite nicht gleichmäßigen Auftragsdicke führen würde, kompensiert.At the in Fig. 2 illustrated embodiment, the application roller 6.2 a plurality of digitally controlled nozzles 6.1 in the form of printheads (paint spray nozzles) assigned. The nozzles or printheads 6.1 are arranged in at least one row and preferably cover the complete roll width (axial roll length). Depending on the desired printing speed and several rows of print heads can be provided, which in the FIGS. 1 and 2 is indicated by a dotted Druckkopffreihe. The print heads 6.1 of a row are preferably offset from the printheads 6.1 'of the print head row extending parallel thereto, ie arranged in the gaps between the print heads of the print head row extending parallel thereto. The print heads 6.1, 6.1 'are positioned at a small distance above the applicator roller 6.2, whereas the applicator roller 6.2 delivers by contact the printed structural paint to the support plate 1. The lateral surface of the application roller 6.2 is formed substantially smooth or slightly structured. Furthermore, the application roller 6.2 is preferably gummed and cambered. By the crowning, ie the targeted barrel-like thickening of the applicator roller 6.2 towards its center, the Deflection of the roller 6.2, which would result in a purely cylindrically shaped roller to a non-uniform width across the order thickness compensated.

Analog zum indirekten Tiefdruck des Dekorbildes wird somit die dreidimensionale Struktur nicht direkt auf Trägerplatte 1, sondern digital auf die Auftragswalze 6.2 gedruckt, welche dann die aufgedruckte Struktur auf die Trägerplatte 1 überträgt,Analogous to the indirect gravure printing of the decorative image, the three-dimensional structure is thus not printed directly on carrier plate 1, but digitally on applicator roller 6.2, which then transfers the printed structure onto carrier plate 1,

Die digitalen Steuerbefehle zur Erzeugung der Struktur können in einem Datensatz passend zum Dekorbild vorliegen oder werden anhand des mittels einer optischen Abtastvorrichtung (nicht gezeigt) eingelesenen Dekorbildes berechnet bzw. erzeugt. Hierzu wird beispielsweise mittels eines Kamerasystems (nicht gezeigt) das Dekorbild auf der Trägerplatte 1 lokalisiert und der Nullpunkt zum Bedrucken des Walzenmantels der Auftragswalze 6.2 berechnet bzw. bestimmt. Auf diese Weise kann sichergestellt werden, dass die erzeugte dreidimensionale Lackoberfläche 1.1 mit den darin vorhandenen Lackporen zu dem Dekorbild, beispielsweise einem Holzdekorbild auf der Trägerplatte 1 passt. In Fachkreisen wird diesbezüglich auch von einer "synchronen Lackpore" oder "synchronen Oberflächenstruktur" gesprochen.The digital control commands for generating the structure can be present in a data record matching the decorative image or are calculated or generated on the basis of the decorative image read by means of an optical scanning device (not shown). For this purpose, for example by means of a camera system (not shown) locates the decorative image on the support plate 1 and calculated or determined the zero point for printing the roll shell of the applicator roll 6.2. In this way it can be ensured that the generated three-dimensional paint surface 1.1 with the paint pores therein to the decorative image, for example, a wooden decorative image on the support plate 1 fits. In professional circles, this also refers to a "synchronous paint pore" or "synchronous surface structure".

In Fig. 3 ist ein Ausführungsbeispiel der erfindungsgemäßen Vorrichtung skizziert. Bei diesem Ausführungsbeispiel wird der Lack zur Herstellung der Oberflächenstruktur nicht mittels Lackstrahldruckköpfen (Lackstrahldüsen), sondern mittels einer Dosierwalze 6.4 und/oder einer Rakel (nicht gezeigt) auf die Auftragswalze 6.2 aufgebracht. Die Dosierwalze 6.4 oder Rakel erzeugt auf der Auftragswalze 6.2 einen Lackfilm 6.5 mit definierter Schichtdicke.In Fig. 3 an embodiment of the device according to the invention is outlined. In this embodiment, the paint for the production of the surface structure is not applied by means of paint jet print heads (paint spray nozzles), but by means of a metering roller 6.4 and / or a doctor blade (not shown) on the applicator roll 6.2. The metering roller 6.4 or doctor blade generates on the applicator roller 6.2 a paint film 6.5 with a defined layer thickness.

Der Lackfilm 6.5 wird dann auf der Auftragswalze 6.2 mittels Gasstrahlen, vorzugsweise Druckluftstrahlen partiell verdrängt und somit in eine dreidimensionale Struktur umgeformt. Hierzu sind über und/oder an der Auftragswalze 6.2 digital gesteuerte Gasdüsen oder Druckluftdüsen 6.1 angeordnet. Die Düsen 6.1 sind dabei in mindestens einer Reihe angeordnet, die sich über die Walzenbreite, d.h. entlang der Drehachse der Auftragswalze erstreckt. Vorzugsweise sind mehrere Düsenreihen vorhanden (vgl. Fig. 1; 6.1, 6.1'), die ein digital schaltbares Düsenraster definieren.The paint film 6.5 is then partially displaced on the application roller 6.2 by means of gas jets, preferably compressed air jets, and thus converted into a three-dimensional structure. For this purpose, digitally controlled gas nozzles or compressed-air nozzles 6.1 are arranged above and / or on the application roller 6.2. The nozzles 6.1 are arranged in at least one row, which extends over the roll width, ie along the axis of rotation of Application roller extends. Preferably, several rows of nozzles are present (see. Fig. 1 ; 6.1, 6.1 '), which define a digitally switchable nozzle grid.

Der den Lack aufnehmende Mantelflächenbereich der Auftragswalze 6.2 ist wiederum im Wesentlichen glatt oder leicht strukturiert ausgebildet. Auch ist die Auftragswalze vorzugsweise gummiert und/oder bombierte ausgebildet.The lacquer-receiving lateral surface area of the application roller 6.2 is in turn substantially smooth or slightly structured. Also, the applicator roll is preferably rubberized and / or cambered formed.

Der Auftragswalze 6.2 ist in Vorschubrichtung der Trägerplatte 1 eine optische Abtastvorrichtung (nicht dargestellt) vorgeordnet, die das Dekorbild oder eine auf der Trägerplatte 1 angebrachte Steuermarke erfasst. Die Abtastvorrichtung ist an einer Steuervorrichtung (nicht gezeigt) angeschlossen, welche die Düsen 6.1,6.1' in Abhängigkeit der von der Abtastvorrichtung erzeugten Messsignale digital steuert.The applicator roller 6.2 is preceded by an optical scanning device (not shown) in the feed direction of the carrier plate 1, which detects the decorative image or a control mark attached to the carrier plate 1. The scanning device is connected to a control device (not shown) which digitally controls the nozzles 6.1, 6.1 'as a function of the measuring signals generated by the scanning device.

Der Auftragswalze 6.2 kann eine Strahlenquelle oder Heizvorrichtung 6.6 zugeordnet sein, die ausgebildet ist, um den auf die Auftragswalze 6.2 aufgetragenen und strukturierten Lack auf derselben vorzutrocknen oder vorzuhärten.The application roller 6.2 may be associated with a radiation source or heating device 6.6, which is designed to pre-dry or pre-cure the paint applied to the application roller 6.2 and structured on the same.

Die Ausführung der Erfindung ist nicht auf die vorstehend beschriebenen Ausführungsbeispiele beschränkt. Vielmehr sind zahlreiche Varianten denkbar, die auch bei grundsätzlich abweichender Gestaltung von der in den beiliegenden Ansprüchen angegebenen Erfindung Gebrauch machen. So liegt es beispielsweise auch im Rahmen der Erfindung, das Aufbringen des Dekors (Dekorbildes) auf die Trägerplatte 1 durch Aufpressen von harzgetränktem Dekorpapier zu verwirklichen. Insbesondere liegt es im Rahmen der Erfindung, verschiedene Merkmale der beschriebenen Ausführungsbeispiele miteinander zu kombinieren.The embodiment of the invention is not limited to the embodiments described above. Rather, numerous variants are conceivable, which make use even with fundamentally different design of the invention specified in the appended claims. For example, it is also within the scope of the invention to realize the application of the decoration (decorative image) on the carrier plate 1 by pressing resin-impregnated decorative paper. In particular, it is within the scope of the invention to combine different features of the described embodiments with each other.

Claims (17)

  1. Method for producing a structured, at least partly optically transparent varnish surface on the surface of a substrate board (1), preferably of a wood material board, which has a decoration, wherein transparent or at least partly transparent varnish is applied to an applicator roll (6.2) to produce the structured varnish surface and is transferred to the surface of the substrate board (1) having a decoration by the applicator roll (6.2), characterised in that the varnish is transformed on the applicator roll (6.2) by a plurality of digitally controlled gas nozzles (6.1,6.1') into a distribution defining a structure.
  2. Method according to claim 1, characterised in that the varnish is transformed into such a distribution on the applicator roll (6.2) that the structure, resulting from this distribution, of the structured varnish surface produced on the surface of the substrate board (1) defines pores which match the decor image of the decoration.
  3. Method according to claim 1 or claim 2, characterised in that before the varnish is transferred to the substrate board (1), the decor image of the decoration or a guide mark placed on the substrate board is detected by an optical scanning device, and measuring signals generated by the scanning device are used to control the digitally controlled gas nozzles (6.1, 6.1').
  4. Method according to any of claims 1 to 3, characterised in that compressed air nozzles are used as digitally controlled gas nozzles (6.1, 6.1').
  5. Method according to any of claims 1 to 4, characterised in that the varnish applied to the applicator roll (6.2) is pre-dried or pre-cured on the applicator roll (6.2).
  6. Method according to any of claims 1 to 5, characterised in that the varnish is applied as a film of varnish (6.5) to the applicator roll (6.2) by a metering roll (6.4) and/or by a doctor.
  7. Method according to any of claims 1 to 6, characterised in that an applicator roll (6.2), the varnish-receiving lateral surface region of which is substantially smooth, is used as the applicator roll.
  8. Method according to any of claims 1 to 7, characterised in that a rubberised and/or bowed applicator roll (6.2) is used as the applicator roll.
  9. Method according to any of claims 1 to 8, characterised in that the varnish contains hard particles, preferably corundum particles.
  10. Device for producing a structured, at least partly optically transparent varnish surface on the surface of a substrate board (1), preferably of a wood material board, which has a decoration, comprising an applicator roll (6.2) for transferring a structured varnish surface to the surface of the substrate board (1) having a decoration, characterised by a plurality of digitally controlled gas nozzles (6.1, 6.1') which are configured to transform on the applicator roll (6.2) a transparent or at least partly transparent varnish, which has been applied to the applicator roll (6.2) as a film of varnish, into a distribution defining a structure.
  11. Device according to claim 10, characterised in that the digitally controlled gas nozzles (6.1, 6.1') are arranged in at least one row which runs along the rotational axis of the applicator roll (6.2).
  12. Device according to claim 10 or claim 11, characterised in that arranged upstream of the applicator roll (6.2) in the feed direction of the substrate board (1) is an optical scanning device which detects the decor image of the decoration or a guide mark placed on the substrate board (1), the scanning device being connected to a control device which digitally controls the gas nozzles (6.1, 6.1'), subject to the measuring signals generated by the scanning device.
  13. Device according to any of claims 10 to 12, characterised in that the digitally controlled gas nozzles (6.1, 6.1') are formed as compressed air nozzles.
  14. Device according to any of claims 10 to 13, characterised in that associated with the applicator roll (6.2) is a radiation source or a heating device (6.6) which is configured to pre-dry or pre-cure the varnish applied and structured on the applicator roll (6.2) on said applicator roll.
  15. Device according to any of claims 10 to 14, characterised in that associated with the applicator roll (6.2) is a metering roll (6.4) and/or a doctor, which is/are configured to produce the film of varnish (6.5) on the applicator roll 6.2.
  16. Device according to any of claims 10 to 15, characterised in that the varnish-receiving lateral surface region of the applicator roll (6.2) is substantially smooth.
  17. Device according to any of claims 10 to 16, characterised in that the applicator roll (6.2) is rubberised and/or bowed.
EP13707412.6A 2012-04-20 2013-03-06 Method and apparatus for producing a structured varnish surface Active EP2838671B1 (en)

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EP2873535A1 (en) * 2013-11-15 2015-05-20 Flooring Technologies Ltd. Workpieces with structured decorative surface
EP2902211B1 (en) * 2014-01-31 2019-01-02 OCE-Technologies B.V. Ghosting compensation in relief images for directional prints
US20170087586A1 (en) * 2015-09-30 2017-03-30 Toto Ltd. Method for forming a coating film and a functional member comprising the same
EP3453464B1 (en) * 2017-09-11 2020-11-04 Hesse GmbH & Co. KG Roller application of lacquers and wood surfaces

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US9782797B2 (en) 2017-10-10
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US20150064342A1 (en) 2015-03-05
PT2838671T (en) 2017-10-30
ES2644300T3 (en) 2017-11-28
DE102012103491A1 (en) 2013-10-24
EP2838671A1 (en) 2015-02-25

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