EP1935657B1 - Method and device for coating workpieces - Google Patents

Method and device for coating workpieces Download PDF

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Publication number
EP1935657B1
EP1935657B1 EP06026431A EP06026431A EP1935657B1 EP 1935657 B1 EP1935657 B1 EP 1935657B1 EP 06026431 A EP06026431 A EP 06026431A EP 06026431 A EP06026431 A EP 06026431A EP 1935657 B1 EP1935657 B1 EP 1935657B1
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EP
European Patent Office
Prior art keywords
micro
workpiece
nozzle
curable mass
coating
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
EP06026431A
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German (de)
French (fr)
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EP1935657A1 (en
Inventor
Achim Gauss
Ludwig Albrecht
Karl Frey
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.)
Homag GmbH
Original Assignee
Homag Holzbearbeitungssysteme GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Homag Holzbearbeitungssysteme GmbH filed Critical Homag Holzbearbeitungssysteme GmbH
Priority to EP06026431A priority Critical patent/EP1935657B1/en
Priority to ES06026431T priority patent/ES2402367T3/en
Priority to US11/960,121 priority patent/US20080152819A1/en
Priority to CNA2007101600116A priority patent/CN101204690A/en
Publication of EP1935657A1 publication Critical patent/EP1935657A1/en
Application granted granted Critical
Publication of EP1935657B1 publication Critical patent/EP1935657B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27D—WORKING VENEER OR PLYWOOD
    • B27D5/00—Other working of veneer or plywood specially adapted to veneer or plywood
    • B27D5/006—Trimming, chamfering or bevelling edgings, e.g. lists
    • 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
    • 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
    • B41J11/002—Curing or drying the ink on the copy materials, e.g. by heating or irradiating
    • B41J11/0021—Curing or drying the ink on the copy materials, e.g. by heating or irradiating using irradiation
    • B41J11/00214—Curing or drying the ink on the copy materials, e.g. by heating or irradiating using irradiation using UV radiation
    • 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
    • B41J11/002—Curing or drying the ink on the copy materials, e.g. by heating or irradiating
    • B41J11/0021—Curing or drying the ink on the copy materials, e.g. by heating or irradiating using irradiation
    • B41J11/00216—Curing or drying the ink on the copy materials, e.g. by heating or irradiating using irradiation using infrared [IR] radiation or microwaves
    • 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
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
    • B05C9/08—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material and performing an auxiliary operation
    • B05C9/14—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material and performing an auxiliary operation the auxiliary operation involving heating or cooling

Definitions

  • the invention relates to a device for coating workpieces, which are preferably at least partially made of wood, wood materials, plastic or the like, according to the preamble of claim 1, and a method using this device.
  • the mini-nose is usually made by milling the respective floor panels.
  • the milled surface must be provided with a coating, eg a primer coat, prior to patterning (eg printing).
  • a coating eg a primer coat
  • the so-called vacuum technique is often used, which is offered for example by the company. Schiele (www.schielemaschinenbau.de).
  • Schiele www.schielemaschinenbau.de
  • the paint application due to the suction of the paint and the turbulence of the air is not applied very sharp edges. It can only apply a certain color which comes close to the basic color of the surface decor.
  • a high amount of paint in circulation of the vacuum device In general, a high amount of paint in circulation of the vacuum device. During a paint or varnish change, large paint losses occur due to the necessary rinsing of the system components.
  • the Vakumattechnik itself has a high energy consumption, once by the generation of negative pressure, as well as the power that must be introduced to dry the paint, the equipment costs are relatively
  • stamping foil to the respective mini-case.
  • embossing foil has the main advantage that a swelling of the milled base material is avoided.
  • the stamping foils are only available in cm wide foils, although in many applications only a few mm are required. This leads to a high waste of material.
  • the edge zones of the coating area, as in the case of application with Vakumat, are not very sharp, since the tear-off forces are not clear.
  • Another disadvantage is the storage of the many different necessary decors suitable for decor surface, as well as the quite large set-up times for changing a decor.
  • FR 2 886 880 A a device according to the preamble of claim 1.
  • the invention is based on the idea to take a new approach in a device of the type mentioned by not only known techniques are adapted for the coating of narrow or partial surfaces, which were developed for large-area components.
  • the invention provides that in a device of the type mentioned, the applicator has at least one micro nozzle for applying the curable composition, and at least one microvalve.
  • the curable composition can be very selectively and sharply applied to the respective surface portion of the workpieces, without the need for a complicated or complex arrangement would be required.
  • the applicator has at least one microvalve.
  • the applicator has at least one pressurized supply of hardenable mass.
  • This allows a particularly good response and a high throughput of the device according to the invention, as for a Coating process only a micro-valve must be opened by a suitable current pulse or the like.
  • the pressurized supply has a comparatively small volume, and that in addition an actual reservoir is provided which supplies the pressurized stock with hardenable mass and itself does not necessarily have to be under pressure.
  • the pressurized supply can also be designed to be large-volume and / or for the most part be arranged at a location remote from the respective micro-nozzle.
  • the pressurized stock can be acted upon, for example by a pressure piston which defines a desired pressure and can also provide for the elimination of air bubbles or the like, so that there is a high setting accuracy of the pressure and the discharge rate. Furthermore, it is also possible to draw conclusions about possibly clogged micro-nozzles via such a pressure piston.
  • the applicator per micro nozzle has at least one microvalve. In this way, both the type of coating and the coating area can be variably adjusted.
  • microvalves can be configured in the context of the present invention in various ways, with the use of magnetic microvalves has proved to be particularly advantageous that they can be particularly simple and precise control and operate.
  • the respective microvalve is arranged between the at least one, preferably pressurized supply of hardenable mass and the at least one micro nozzle.
  • the dimensions of the micro nozzle are not particularly limited in the context of the present invention and can rather be selected depending on the particular requirements, such as in particular the nature and viscosity of the curable composition to be applied, the required throughput, the desired order accuracy or resolution, etc.
  • the at least one micro nozzle has a diameter of at least 50 ⁇ m, preferably at least 100 ⁇ m.
  • the nozzle diameter should not be too large, otherwise, for example, the edge sharpness is impaired.
  • the at least one micro nozzle has a diameter of at most 300 ⁇ m, preferably at most 200 ⁇ m.
  • the device When milling the workpieces or similar upstream processing steps often arises, depending on the material of the workpiece, a porous and absorbent surface to be coated.
  • a porous and absorbent surface to be coated In order to prepare the surface to be coated on the subsequent coating and, for example, to reduce its absorbency or to compensate for irregularities, is provided according to a development of the invention that the device also has a Smoothing device for smoothing a to be provided with the curable material surface of the respective workpiece.
  • the smoothing device may be configured in a variety of ways, for example, as a thermal transfer smoothing device. This ensures that the surface of the workpiece is closed and swelling of the material is avoided. Furthermore, the introduction of heat promotes subsequent curing of a hardenable material in many cases. Last but not least, the hardenable mass can no longer or only less penetrate into the material, which leads to a lower consumption of hardenable mass.
  • the applicator can in principle also be designed to apply not only monochrome but also patterned coatings to the respective workpiece. Due to the high demands on the quality of the respective print image (for example, a wood grain), it has proved to be advantageous to provide for the application of a patterning a separate printing device, in particular an ink-jet printing device.
  • the device according to the invention may further comprise a pretreatment device, as described, for example, in the European patent application EP 06 004 713.1 The present applicant is disclosed and claimed and the entire disclosure of which is expressly incorporated by reference.
  • the Device further comprises at least one curing device, in particular at least one NIR curing device and / or a UV curing device.
  • the NIR curing device is primarily suitable for the curable coating composition
  • a UV curing device primarily serves for curing or drying an ink or the like applied by the printer device.
  • a particularly advantageous method for coating workpieces using the apparatus described above is the subject of claim 12. With this method, the advantages described above can be achieved particularly well. It is particularly preferred that the respective workpiece is first preferably machined in the area of the surface and is also preferably pretreated, in particular smoothed, and that at least the processed and optionally pretreated area is coated at least in sections with the hardenable mass. Alternatively or additionally, according to a development of the method according to the invention, provision is made for the workpiece to be essentially plate-shaped or strip-shaped, and for the workpiece to be coated in sections with the hardenable mass, at least in the region of a narrow surface, the narrow surface preferably being angled relative to a large surface of the workpiece is.
  • FIG Fig. 1 A coating apparatus 1 as a preferred embodiment of the present invention is shown in FIG Fig. 1 shown schematically.
  • the device is used for coating and possibly also patterning of workpieces 2, which may be, for example, floor panels, which consist at least partially of wood, wood materials, plastic or optionally also paint or the like. It should be noted, however, that the device 1 according to the invention is also suitable for coating different types of workpieces 2, although it is primarily intended for the applications mentioned.
  • the device 1 comprises a conveying device 20, which is designed as a conveyor belt or conveying table and can convey the respective workpieces 2 in a direction of passage shown by an arrow.
  • a conveying device 20 which is designed as a conveyor belt or conveying table and can convey the respective workpieces 2 in a direction of passage shown by an arrow.
  • the present embodiment thus relates to a so-called continuous machine, it should be noted that the respective workpiece can also be arranged stationary. In this case, those components of the apparatus that perform machining on the workpiece could and should be moved with respect to the workpiece. Mixed forms of both embodiments are possible within the scope of the invention.
  • the conveyor 20 several processing components are arranged in the present embodiment, and first of all a processing device (not shown in detail) for machining the workpiece, such as a milling unit, then a smoothing device 30 for smoothing a surface 2 'of the respective workpiece 2 machined by the processing device, an application device 10 for applying a curable compound 4, an NIR Hardening device 50, an ink-jet printing device 40, a UV curing device 60, a topcoat applicator 70 and another UV curing device 60.
  • the device 1 is configured such that, depending on the respective requirements, either all the components mentioned or optionally even one or more components make a machining on the continuous workpiece 2.
  • the respective components are connected to a control device not shown in detail, which is able to automatically control the operation of the individual components in dependence on the requirements.
  • the applicator 10 has in the present embodiment, as well as in Fig. 2 can be seen, a plurality of micro-nozzles 12 for applying the curable composition 4, for example a paint, on the surface 2 'of the respective workpiece.
  • the micro-nozzles 12, as in Fig. 2 can be best seen, adapted in their inclination to the orientation of the surface to be coated 2 'and can be stored for this purpose and pivoted or rotated.
  • each micro nozzle 12 is associated with a microvalve communicating with a pressurized supply of curable composition, also not shown, such that opening of the microvalve causes a predetermined amount of curable composition to escape from the respective microjets 12 can be ejected.
  • the opening and closing of the microvalve 12 also via the control device, not shown, or corresponding electrical pulses be executed.
  • the microvalves 12 may be, for example, magnetic microvalves.
  • micro-nozzles in the present embodiment have a diameter in the range of about 100 ⁇ m to 200 ⁇ m, although the present invention is not limited thereto.
  • 20 micro-nozzles are provided in a uniform arrangement, wherein the number of micro-nozzles and their (optionally staggered) arrangement can be varied to suit the respective requirements.
  • the smoothing device 30 provided upstream of the applicator 10 is configured as a thermal transfer smoothing device in the present embodiment. It is therefore in principle a heated, smooth surface, which is pressed against the workpiece surface 2 'sliding.
  • the smoothing device can also be designed in a completely different manner and cause, for example, a fine grinding of the surface 2 '.
  • the application device 10 is adjoined by the NIR curing device 50, which in the present embodiment is designed to cure a paint applied by the application device 10.
  • the curing device 50 can, of course, be adapted to the requirements.
  • the ink-jet printing device 40 which is designed to apply a desired printed image to the applied coating material 4, for example a wood grain or the like.
  • a UV curing device 60 which is designed to cure or dry the ink applied by the ink-jet printing device 40.
  • a final lacquer application device 70 follows, in order to additionally seal the printed image of the ink-jet printing device 40 by, for example, an abrasion-resistant clear ink or a lacquer in the case of very high-grade products, and finally cure or dry it by a further UV curing device 60.
  • a workpiece 2 is guided along the various components of the device 1 using the conveying device 20, and according to the requirements, one or more of the above-described machining operations on the workpiece 2 or the surface 2 'to be processed are carried out. executed.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Description

Technisches GebietTechnical area

Die Erfindung betrifft eine Vorrichtung zum Beschichten von Werkstücken, die bevorzugt zumindest teilweise aus Holz, Holzwerkstoffen, Kunststoff oder dergleichen bestehen, nach dem Oberbegriff von Anspruch 1, sowie ein Verfahren unter Einsatz dieser Vorrichtung.The invention relates to a device for coating workpieces, which are preferably at least partially made of wood, wood materials, plastic or the like, according to the preamble of claim 1, and a method using this device.

Stand der TechnikState of the art

Zum Beschichten von Werkstücken, die beispielsweise zumindest teilweise aus Holz, Holzwerkstoffen, Kunststoff oder dergleichen bestehen, sind vielfältige Techniken bekannt. Eine zuletzt gestellte Anforderung im Bereich der Fußbodenherstellung besteht darin, bei Fußbodenpaneelen wie Fertigparkett oder Laminat eine so genannte "Minifase" zu beschichten und zu bemustern. Die Anordnung einer derartigen Minifase 2' an einem Fußbodenpaneel (Werkstück) 2 ist schematisch und rein beispielhaft in Fig. 3 dargestellt.For coating workpieces, which for example consist at least partially of wood, wood-based materials, plastic or the like, various techniques are known. One last requirement in the field of floor production is to coat and pattern a so-called "mini-foot" in floor panels such as prefinished parquet or laminate. The arrangement of such a mini-base 2 'on a floor panel (workpiece) 2 is schematically and purely by way of example in FIG Fig. 3 shown.

Die Minifase wird üblicherweise durch Anfräsen der jeweiligen Fußbodenpaneele hergestellt. Die angefräste Oberfläche muss vor dem Bemustern (z.B. Bedrucken) mit einer Beschichtung, z.B. einem Grundierungslack, versehen werden. Hierfür kommt gegenwärtig oft die so genannte Vakumattechnik zum Einsatz, die beispielsweise von der Fa. Schiele (www.schielemaschinenbau.de) angeboten wird. Bei dieser Technik ist allerdings der Lackauftrag infolge des Absaugens des Lackes und der Verwirbelung der Luft nicht sehr randscharf aufzubringen. Es kann nur eine bestimmte Farbe aufgebracht werden, welche der Grundfarbe des Oberflächendekors nahe kommt. Generell ist eine hohe Menge an Lack im Umlauf der Vakumateinrichtung. Bei einem Farb- oder Lackwechsel entstehen große Lackverluste durch die notwendigen Spülvorgänge der Systemkomponenten. Die Vakumattechnik selbst hat einen hohen Energieverbrauch, einmal durch die Erzeugung des Unterdruckes, sowie die Leistung die zur Abtrocknung des Lackes eingebracht werden muss, die Anlagenkosten sind relativ hoch.The mini-nose is usually made by milling the respective floor panels. The milled surface must be provided with a coating, eg a primer coat, prior to patterning (eg printing). For this purpose, the so-called vacuum technique is often used, which is offered for example by the company. Schiele (www.schielemaschinenbau.de). In this technique, however, the paint application due to the suction of the paint and the turbulence of the air is not applied very sharp edges. It can only apply a certain color which comes close to the basic color of the surface decor. In general, a high amount of paint in circulation of the vacuum device. During a paint or varnish change, large paint losses occur due to the necessary rinsing of the system components. The Vakumattechnik itself has a high energy consumption, once by the generation of negative pressure, as well as the power that must be introduced to dry the paint, the equipment costs are relatively high.

Alternativ ist es auch bekannt, eine Prägefolie auf die jeweilige Minifase aufzubringen. Der Auftrag durch Prägefolie hat den Hauptvorteil, dass ein Aufquellen des angefrästen Grundmateriales vermieden wird. Allerdings sind die Prägefolien, um diese prozesssicher verarbeiten zu können, nur in cm breiten Folien verfügbar, obwohl in vielen Anwendungsfällen nur wenige mm benötigt werden. Dies führt zu einer hohen Materialverschwendung. Die Randzonen des Beschichtungsbereichs sind wie beim Auftrag mit Vakumat nicht sehr randscharf, da die Abrisskräfte nicht eindeutig sind. Ein weiterer Nachteil ist das Bevorraten der vielen verschiedenen notwendigen Dekore passend zur Dekoroberfläche, sowie die recht grossen Rüstzeiten zum Wechsel eines Dekores.Alternatively, it is also known to apply a stamping foil to the respective mini-case. The application of embossing foil has the main advantage that a swelling of the milled base material is avoided. However, in order to be able to process these reliably, the stamping foils are only available in cm wide foils, although in many applications only a few mm are required. This leads to a high waste of material. The edge zones of the coating area, as in the case of application with Vakumat, are not very sharp, since the tear-off forces are not clear. Another disadvantage is the storage of the many different necessary decors suitable for decor surface, as well as the quite large set-up times for changing a decor.

Ferner offenbart die FR 2 886 880 A eine Vorrichtung nach dem Oberbegriff von Anspruch 1.Further, the FR 2 886 880 A a device according to the preamble of claim 1.

Darstellung der ErfindungPresentation of the invention

Es ist daher Aufgabe der Erfindung, eine Vorrichtung der eingangs genannten Art bereitzustellen, die eine einfache und dennoch präzise und hochwertige Beschichtung von Werkstücken insbesondere im Bereich von Schmal- oder Teilflächen ermöglicht, sowie ein Verfahren hierfür bereitzustellen.It is therefore an object of the invention to provide a device of the type mentioned, which allows a simple, yet precise and high-quality coating of workpieces, especially in the field of narrow or partial surfaces, and to provide a method for this.

Diese Aufgabe wird erfindungsgemäß durch eine Vorrichtung nach Anspruch 1 und ein Verfahren unter Einsatz der erfindungsgemäßen Vorrichtung nach Anspruch 10 gelöst.This object is achieved by a device according to claim 1 and a method using the device according to the invention according to claim 10.

Besonders bevorzugte Weiterbildungen der Erfindung sind Gegenstand der abhängigen Ansprüche.Particularly preferred developments of the invention are the subject of the dependent claims.

Der Erfindung liegt der Gedanke zugrunde, bei einer Vorrichtung der eingangs genannten Art einen neuen Weg einzuschlagen, indem zum Beschichten von Schmal- oder Teilflächen nicht lediglich bekannte Techniken adaptiert werden, die für großflächige Bauteile entwickelt wurden. Zu diesem Zweck ist erfindungsgemäß vorgesehen, dass bei einer Vorrichtung der eingangs genannten Art die Auftrageinrichtung mindestens eine Mikrodüse zum Auftragen der aushärtbaren Masse, und mindestens ein Mikroventil aufweist.The invention is based on the idea to take a new approach in a device of the type mentioned by not only known techniques are adapted for the coating of narrow or partial surfaces, which were developed for large-area components. For this purpose, the invention provides that in a device of the type mentioned, the applicator has at least one micro nozzle for applying the curable composition, and at least one microvalve.

Durch das Vorsehen mindestens einer Mikrodüse lässt sich die aushärtbare Masse sehr gezielt und randscharf auf den jeweiligen Oberflächenabschnitt der Werkstücke aufbringen, ohne dass hierfür eine komplizierte oder aufwändige Anordnung erforderlich wäre. Für den Ausstoßvorgang der aushärtbaren Masse aus den Mikrodüsen im Rahmen der vorliegenden Erfindung weist die Auftrageinrichtung mindestens ein Mikroventil auf. So hat sich gezeigt, dass sich diese Art der Zufuhr und Steuerung der aushärtbaren Masse in Verbindung mit einer zugehörigen Mikrodüse besonders gut für Lacke und ähnliche Beschichtungsstoffe eignet, da sich eine präzise und einfache Steuerbarkeit mit gutem Ansprechverhalten ergibt. Ferner verhindert das jeweilige Mikroventil ein unerwünschtes Aushärten der bereitstehenden, aushärtbaren Masse bei geringem Wartungsaufwand und hoher Lebensdauer.By providing at least one micro nozzle, the curable composition can be very selectively and sharply applied to the respective surface portion of the workpieces, without the need for a complicated or complex arrangement would be required. For the ejection process of the hardenable mass from the micro-nozzles in the context of the present invention, the applicator has at least one microvalve. Thus, it has been found that this type of supply and control of the curable composition in conjunction with an associated micro nozzle is particularly well suited for paints and similar coating materials, as results in a precise and easy controllability with good response. Furthermore, the respective microvalve prevents unwanted hardening of the curable composition which is available with low maintenance and a long service life.

Gemäß der Erfindung ist ferner vorgesehen, dass die Auftrageinrichtung mindestens einen unter Druck stehenden Vorrat von aushärtbarer Masse aufweist. Hierdurch werden ein besonders gutes Ansprechverhalten und ein hoher Durchsatz der erfindungsgemäßen Vorrichtung ermöglicht, da für einen Beschichtungsvorgang lediglich ein Mikroventil durch einen geeigneten Stromimpuls oder dergleichen geöffnet werden muss. Dabei kann es in vielen Fällen ausreichend sein, dass der unter Druck stehende Vorrat ein vergleichsweise geringes Volumen besitzt, und dass zusätzlich ein eigentlicher Vorratsbehälter vorgesehen ist, der den unter Druck stehenden Vorrat mit aushärtbarer Masse versorgt und selbst nicht notwendigerweise unter Druck stehen muss. Andererseits kann der unter Druck stehende Vorrat auch großvolumig ausgestaltet sein und/oder größtenteils an einem von der jeweiligen Mikrodüse entfernt gelegenen Ort angeordnet sein. Dabei kann der unter Druck stehende Vorrat beispielsweise durch einen Druckkolben beaufschlagt werden, der einen gewünschten Druck definiert und auch für die Beseitigung von Luftblasen oder dergleichen sorgen kann, so dass sich eine hohe Einstellgenauigkeit des Drucks und der Ausstoßmenge ergibt. Ferner kann über einen derartigen Druckkolben auch auf möglicherweise verstopfte Mikrodüsen rückgeschlossen werden.According to the invention it is further provided that the applicator has at least one pressurized supply of hardenable mass. This allows a particularly good response and a high throughput of the device according to the invention, as for a Coating process only a micro-valve must be opened by a suitable current pulse or the like. It may be sufficient in many cases that the pressurized supply has a comparatively small volume, and that in addition an actual reservoir is provided which supplies the pressurized stock with hardenable mass and itself does not necessarily have to be under pressure. On the other hand, the pressurized supply can also be designed to be large-volume and / or for the most part be arranged at a location remote from the respective micro-nozzle. In this case, the pressurized stock can be acted upon, for example by a pressure piston which defines a desired pressure and can also provide for the elimination of air bubbles or the like, so that there is a high setting accuracy of the pressure and the discharge rate. Furthermore, it is also possible to draw conclusions about possibly clogged micro-nozzles via such a pressure piston.

Im Hinblick auf eine hohe Variabilität und Anpassungsfähigkeit der erfindungsgemäßen Vorrichtung ist gemäß einer Weiterbildung vorgesehen, dass die Auftrageinrichtung pro Mikrodüse mindestens ein Mikroventil aufweist. Hierdurch lassen sich sowohl die Art der Beschichtung als auch der Beschichtungsbereich variabel einstellen.In view of a high variability and adaptability of the device according to the invention, it is provided according to a development that the applicator per micro nozzle has at least one microvalve. In this way, both the type of coating and the coating area can be variably adjusted.

Die Mikroventile können im Rahmen der vorliegenden Erfindung auf unterschiedlichste Art und Weise ausgestaltet sein, wobei sich der Einsatz von Magnetmikroventilen als besonders vorteilhaft erwiesen hat, das sich diese besonders einfach und präzise steuern und betätigen lassen.The microvalves can be configured in the context of the present invention in various ways, with the use of magnetic microvalves has proved to be particularly advantageous that they can be particularly simple and precise control and operate.

Das jeweilige Mikroventil ist dabei zwischen dem mindestens einen, bevorzugt unter Druck stehenden Vorrat von aushärtbarer Masse und der mindestens einen Mikrodüse angeordnet.The respective microvalve is arranged between the at least one, preferably pressurized supply of hardenable mass and the at least one micro nozzle.

Die Abmessungen der Mikrodüse (bzw. der Düsenöffnung) sind im Rahmen der vorliegenden Erfindung nicht besonders beschränkt und können vielmehr in Abhängigkeit von den jeweiligen Anforderungen ausgewählt werden, wie insbesondere der Art und Viskosität der aufzutragenden, aushärtbaren Masse, dem erforderlichen Durchsatz, der gewünschten Auftraggenauigkeit bzw. Auflösung, etc. Für die im Rahmen der vorliegenden Erfindung bevorzugten Anwendungsfälle wie beispielsweise das Beschichten von Minifasen, hat es sich jedoch als vorteilhaft erwiesen, dass die mindestens eine Mikrodüse einen Durchmesser von mindestens 50 µm, bevorzugt mindestens 100 µm aufweist. Hierdurch lassen sich Lacke und ähnliche aushärtbare Massen bei ausreichendem Durchsatz zuverlässig und zügig auf die Werkstücke auftragen. Andererseits sollte der Düsendurchmesser auch nicht zu groß gewählt werden, da andernfalls beispielsweise die Randschärfe beeinträchtigt wird. Vor diesem Hintergrund ist gemäß einer Weiterbildung der Erfindung vorgesehen, dass die mindestens eine Mikrodüse einen Durchmesser von höchsten 300 µm, bevorzugt höchsten 200 µm aufweist.The dimensions of the micro nozzle (or the nozzle opening) are not particularly limited in the context of the present invention and can rather be selected depending on the particular requirements, such as in particular the nature and viscosity of the curable composition to be applied, the required throughput, the desired order accuracy or resolution, etc. For the preferred applications in the context of the present invention, such as, for example, the coating of minifases, it has proved to be advantageous that the at least one micro nozzle has a diameter of at least 50 μm, preferably at least 100 μm. As a result, coatings and similar curable materials can be reliably and quickly applied to the workpieces with sufficient throughput. On the other hand, the nozzle diameter should not be too large, otherwise, for example, the edge sharpness is impaired. Against this background, according to a development of the invention, it is provided that the at least one micro nozzle has a diameter of at most 300 μm, preferably at most 200 μm.

Um darüber hinaus eine flächige und gleichmäßige Beschichtung der jeweiligen Werkstückoberflächen zu erzielen, ist gemäß einer Weiterbildung der Erfindung vorgesehen, dass sie eine Mehrzahl von Mikrodüsen aufweist, die bevorzugt in Richtung einer Relativbewegung zwischen der Auftrageinrichtung und dem jeweiligen Werkstück versetzt angeordnet sind.Moreover, in order to achieve a flat and uniform coating of the respective workpiece surfaces, it is provided according to a development of the invention that it has a plurality of micro-nozzles, which are preferably arranged offset in the direction of a relative movement between the applicator and the respective workpiece.

Beim Anfräsen der Werkstücke oder ähnlichen vorgelagerten Bearbeitungsschritten entsteht häufig, je nach Material des Werkstücks, eine poröse und saugfähige, zu beschichtende Fläche. Um die zu beschichtende Fläche auf die nachfolgende Beschichtung vorzubereiten und beispielsweise auch deren Saugvermögen zu vermindern bzw. Ungleichmäßigkeiten auszugleichen, ist gemäß einer Weiterbildung der Erfindung vorgesehen, dass die Vorrichtung ferner eine Glättungseinrichtung zum Glätten einer mit der aushärtbaren Masse zu versehenden Oberfläche des jeweiligen Werkstücks aufweist.When milling the workpieces or similar upstream processing steps often arises, depending on the material of the workpiece, a porous and absorbent surface to be coated. In order to prepare the surface to be coated on the subsequent coating and, for example, to reduce its absorbency or to compensate for irregularities, is provided according to a development of the invention that the device also has a Smoothing device for smoothing a to be provided with the curable material surface of the respective workpiece.

Die Glättungseinrichtung kann, wie anhand der untenstehenden ausführlichen Beschreibung noch besser deutlich werden wird, auf unterschiedlichte Art und Weise ausgestaltet sein, beispielsweise als Thermotransferglättungseinrichtung. Dadurch wird erreicht, dass die Oberfläche des Werkstücks verschlossen und ein Aufquellen des Materials vermieden wird. Ferner wird durch das Einbringen von Wärme das nachfolgende Aushärten eines aushärtbaren Materials in vielen Fällen gefördert. Nicht zuletzt kann die aushärtbare Masse nicht mehr oder nur weniger in das Material eindringen, was zu einem geringeren Verbrauch an aushärtbarer Masse führt.The smoothing device, as will become more apparent from the detailed description below, may be configured in a variety of ways, for example, as a thermal transfer smoothing device. This ensures that the surface of the workpiece is closed and swelling of the material is avoided. Furthermore, the introduction of heat promotes subsequent curing of a hardenable material in many cases. Last but not least, the hardenable mass can no longer or only less penetrate into the material, which leads to a lower consumption of hardenable mass.

Die Auftrageinrichtung kann im Rahmen der vorliegenden Erfindung prinzipiell auch dazu ausgelegt sein, nicht nur einfarbige sondern auch gemusterte Beschichtungen auf das jeweilige Werkstück aufzutragen. Aufgrund der hohen Anforderungen an die Qualität des jeweiligen Druckbildes (beispielsweise einer Holzmaserung), hat es sich jedoch als vorteilhaft erwiesen, für das Aufbringen einer Bemusterung eine separate Druckeinrichtung vorzusehen, insbesondere eine Ink-Jet-Druckeinrichtung. Um die Oberfläche des durch die Auftrageinrichtung aufgetragenen Beschichtungsmaterials für das nachfolgende Bedrucken vorzubereiten, kann die erfindungsgemäße Vorrichtung ferner eine Vorbehandlungseinrichtung aufweisen, wie sie beispielsweise in der europäischen Patentanmeldung EP 06 004 713.1 der vorliegenden Anmelderin offenbart und beansprucht ist und auf deren gesamte Offenbarung ausdrücklich Bezug genommen wird.In the context of the present invention, the applicator can in principle also be designed to apply not only monochrome but also patterned coatings to the respective workpiece. Due to the high demands on the quality of the respective print image (for example, a wood grain), it has proved to be advantageous to provide for the application of a patterning a separate printing device, in particular an ink-jet printing device. In order to prepare the surface of the coating material applied by the application device for the subsequent printing, the device according to the invention may further comprise a pretreatment device, as described, for example, in the European patent application EP 06 004 713.1 The present applicant is disclosed and claimed and the entire disclosure of which is expressly incorporated by reference.

In diesem Zusammenhang kann es auch wichtig sein, dass das aufgebrachte Beschichtungsmaterial vor dem nachfolgenden Druckvorgang weitgehend ausgehärtet ist. Zu diesem Zweck ist gemäß einer Weiterbildung der Erfindung vorgesehen, dass die Vorrichtung ferner mindestens eine Aushärtungseinrichtung aufweist, insbesondere mindestens eine NIR-Aushärtungseinrichtung und/oder eine UV-Aushärtungseinrichtung. Dabei bietet sich die NIR-Aushärtungseinrichtung primär für die aushärtbare Beschichtungsmasse an, während eine UV-Aushärtungseinrichtung primär zum Aushärten bzw. Trocknen einer durch die Druckeinrichtung aufgebrachten Tinte oder dergleichen dient.In this context, it may also be important that the applied coating material is substantially cured before the subsequent printing process. For this purpose, it is provided according to a development of the invention that the Device further comprises at least one curing device, in particular at least one NIR curing device and / or a UV curing device. In this case, the NIR curing device is primarily suitable for the curable coating composition, while a UV curing device primarily serves for curing or drying an ink or the like applied by the printer device.

Ein besonders vorteilhaftes Verfahren zum Beschichten von Werkstücken unter Einsatz der oben beschriebenen Vorrichtung ist Gegenstand von Anspruch 12. Mit diesem Verfahren lassen sich die oben beschriebenen Vorteile besonders gut erzielen. Dabei ist es besonders bevorzugt, dass das jeweilige Werkstück zunächst im Bereich der Oberfläche bevorzugt spanend bearbeitet und besonders bevorzugt auch vorbehandelt, insbesondere geglättet wird, und dass zumindest der bearbeitete und gegebenenfalls vorbehandelte Bereich zumindest abschnittsweise mit der aushärtbaren Masse beschichtet wird. Alternativ oder zusätzlich ist gemäß einer Weiterbildung des erfindungsgemäßen Verfahrens vorgesehen, dass das Werkstück im wesentlichen platten- oder leistenförmig ist, und dass das Werkstück zumindest im Bereich einer Schmalfläche abschnittsweise mit der aushärtbaren Masse beschichtet wird, wobei die Schmalfläche gegenüber einer Großfläche des Werkstücks bevorzugt abgewinkelt ist.A particularly advantageous method for coating workpieces using the apparatus described above is the subject of claim 12. With this method, the advantages described above can be achieved particularly well. It is particularly preferred that the respective workpiece is first preferably machined in the area of the surface and is also preferably pretreated, in particular smoothed, and that at least the processed and optionally pretreated area is coated at least in sections with the hardenable mass. Alternatively or additionally, according to a development of the method according to the invention, provision is made for the workpiece to be essentially plate-shaped or strip-shaped, and for the workpiece to be coated in sections with the hardenable mass, at least in the region of a narrow surface, the narrow surface preferably being angled relative to a large surface of the workpiece is.

Kurze Beschreibung der ZeichnungenBrief description of the drawings

  • Fig. 1 zeigt schematisch eine Ansicht einer Beschichtungsvorrichtung als bevorzugte Ausführungsform der vorliegenden Erfindung; Fig. 1 shows schematically a view of a coating apparatus as a preferred embodiment of the present invention;
  • Fig. 2 zeigt schematisch eine Teilansicht der Vorrichtung aus Fig. 1; Fig. 2 schematically shows a partial view of the device Fig. 1 ;
  • Fig. 3 zeigt schematisch zwei miteinander verbundene Werkstücke, die sich zur Bearbeitung durch die erfindungsgemäße Vorrichtung eignen. Fig. 3 schematically shows two interconnected workpieces, which are suitable for processing by the device according to the invention.

Ausführliche Beschreibung bevorzugter AusführungsformenDetailed description of preferred embodiments

Bevorzugte Ausführungsformen der vorliegenden Erfindung werden nachfolgen ausführlich unter Bezugnahme auf die begleitenden Zeichnungen beschrieben.Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

Eine Beschichtungsvorrichtung 1 als bevorzugte Ausführungsform der vorliegenden Erfindung ist in Fig. 1 schematisch dargestellt. Die Vorrichtung dient zum Beschichten und gegebenenfalls auch Bemustern von Werkstücken 2, bei denen es sich beispielsweise um Fußbodenpaneele handeln kann, die zumindest teilweise aus Holz, Holzwerkstoffen, Kunststoff oder gegebenenfalls auch Lack oder dergleichen bestehen. Es ist jedoch zu beachten, dass die erfindungsgemäße Vorrichtung 1 auch zum Beschichten andersartiger Werkstücke 2 geeignet ist, obgleich sie primär für die genannten Anwendungen gedacht ist.A coating apparatus 1 as a preferred embodiment of the present invention is shown in FIG Fig. 1 shown schematically. The device is used for coating and possibly also patterning of workpieces 2, which may be, for example, floor panels, which consist at least partially of wood, wood materials, plastic or optionally also paint or the like. It should be noted, however, that the device 1 according to the invention is also suitable for coating different types of workpieces 2, although it is primarily intended for the applications mentioned.

Die Vorrichtung 1 umfasst in der vorliegenden Ausführungsform eine Fördereinrichtung 20, die als Förderband bzw. Fördertisch ausgestaltet ist und die jeweiligen Werkstücke 2 in einer durch einen Pfeil gezeigten Durchlaufrichtung fördern kann. Obgleich sich die vorliegende Ausführungsform somit auf eine sogenannte Durchlaufmaschine bezieht, ist zu beachten, dass das jeweilige Werkstück auch stationär angeordnet sein kann. In diesem Falle könnten und müssten diejenigen Komponenten der Vorrichtung, die eine Bearbeitung an dem Werkstück ausführen, in Bezug auf das Werkstück bewegt werden. Auch Mischformen beider Ausgestaltungen sind im Rahmen der Erfindung möglich.In the present embodiment, the device 1 comprises a conveying device 20, which is designed as a conveyor belt or conveying table and can convey the respective workpieces 2 in a direction of passage shown by an arrow. Although the present embodiment thus relates to a so-called continuous machine, it should be noted that the respective workpiece can also be arranged stationary. In this case, those components of the apparatus that perform machining on the workpiece could and should be moved with respect to the workpiece. Mixed forms of both embodiments are possible within the scope of the invention.

Entlang der Fördereinrichtung 20 sind in der vorliegenden Ausführungsform mehrere Bearbeitungskomponenten angeordnet, und zwar zunächst eine nicht näher gezeigte Bearbeitungseinrichtung zum spanenden Bearbeiten des Werkstücks, wie beispielsweise ein Fräsaggregat, anschließend eine Glättungseinrichtung 30 zum Glätten einer durch die Bearbeitungseinrichtung bearbeiteten Oberfläche 2' des jeweiligen Werkstücks 2, eine Auftrageinrichtung 10 zum Auftragen einer aushärtbaren Masse 4, eine NIR-Aushärtungseinrichtung 50, eine Ink-Jet-Druckeinrichtung 40, eine UV-Aushärtungseinrichtung 60, eine Decklackauftrageinrichtung 70 und eine weitere UV-Aushärtungseinrichtung 60. Dabei ist die Vorrichtung 1 derart ausgestaltet, dass in Abhängigkeit von den jeweiligen Anforderungen entweder alle genannten Komponenten oder gegebenenfalls auch nur eine oder mehrere Komponenten eine Bearbeitung an dem durchlaufenden Werkstück 2 vornehmen. Um dies zu erreichen, sind die jeweiligen Komponenten mit einer nicht näher gezeigten Steuereinrichtung verbunden, die in der Lage ist, den Betrieb der einzelnen Komponenten in Abhängigkeit von den Anforderungen automatisch zu steuern.Along the conveyor 20 several processing components are arranged in the present embodiment, and first of all a processing device (not shown in detail) for machining the workpiece, such as a milling unit, then a smoothing device 30 for smoothing a surface 2 'of the respective workpiece 2 machined by the processing device, an application device 10 for applying a curable compound 4, an NIR Hardening device 50, an ink-jet printing device 40, a UV curing device 60, a topcoat applicator 70 and another UV curing device 60. In this case, the device 1 is configured such that, depending on the respective requirements, either all the components mentioned or optionally even one or more components make a machining on the continuous workpiece 2. To achieve this, the respective components are connected to a control device not shown in detail, which is able to automatically control the operation of the individual components in dependence on the requirements.

Die Auftrageinrichtung 10 besitzt in der vorliegenden Ausführungsform, wie auch in Fig. 2 zu erkennen ist, eine Mehrzahl von Mikrodüsen 12 zum Auftragen der aushärtbaren Masse 4, beispielsweise eines Lacks, auf die Oberfläche 2' des jeweiligen Werkstücks. Dabei sind die Mikrodüsen 12, wie in Fig. 2 am besten zu erkennen ist, in ihrer Neigung an die Ausrichtung der zu beschichteten Oberfläche 2' angepasst und können zu diesem Zweck auch verschwenkbar bzw. verdrehbar gelagert sein. Obgleich in den Figuren nicht näher gezeigt, ist jeder Mikrodüse 12 ein Mikroventil zugeordnet, das mit einem ebenfalls nicht gezeigten, unter Druck stehenden Vorrat von aushärtbarer Masse in Verbindung steht, sodass durch ein Öffnen des Mikroventils eine vorbestimmte Menge an aushärtbarer Masse aus der jeweiligen Mikrodüsen 12 ausgestoßen werden kann. Dabei kann das Öffnen und Schließen des Mikroventils 12 ebenfalls über die nicht gezeigte Steuereinrichtung bzw. entsprechende elektrische Impulse ausgeführt werden. Bei den Mikroventilen 12 kann es sich beispielsweise um Magnetmikroventile handeln.The applicator 10 has in the present embodiment, as well as in Fig. 2 can be seen, a plurality of micro-nozzles 12 for applying the curable composition 4, for example a paint, on the surface 2 'of the respective workpiece. In this case, the micro-nozzles 12, as in Fig. 2 can be best seen, adapted in their inclination to the orientation of the surface to be coated 2 'and can be stored for this purpose and pivoted or rotated. Although not shown in detail in the figures, each micro nozzle 12 is associated with a microvalve communicating with a pressurized supply of curable composition, also not shown, such that opening of the microvalve causes a predetermined amount of curable composition to escape from the respective microjets 12 can be ejected. In this case, the opening and closing of the microvalve 12 also via the control device, not shown, or corresponding electrical pulses be executed. The microvalves 12 may be, for example, magnetic microvalves.

Die Mikrodüsen besitzen in der vorliegenden Ausführungsform einen Durchmesser im Bereich von etwa 100 µm bis 200 µm, obgleich die vorliegende Erfindung nicht hierauf beschränkt ist. In der vorliegenden Ausführungsform sind rein beispielhaft 20 Mikrodüsen in gleichmäßiger Anordnung vorgesehen, wobei die Anzahl der Mikrodüsen und deren (gegebenenfalls versetzte) Anordnung vielfältig an die jeweiligen Anforderungen angepasst werden kann.The micro-nozzles in the present embodiment have a diameter in the range of about 100 μm to 200 μm, although the present invention is not limited thereto. In the present embodiment, by way of example only, 20 micro-nozzles are provided in a uniform arrangement, wherein the number of micro-nozzles and their (optionally staggered) arrangement can be varied to suit the respective requirements.

Die stromaufwärts der Auftrageinrichtung 10 vorgesehene Glättungseinrichtung 30 ist in der vorliegenden Ausführungsform als Thermotransferglättungseinrichtung ausgestaltet. Es handelt sich folglich im Prinzip um eine beheizte, glatte Fläche, die gegen die Werkstückoberfläche 2' gleitend gepresst wird. Allerdings kann die Glättungseinrichtung auch auf völlig andersartige Weise ausgestaltet sein und beispielsweise einen Feinschliff der Oberfläche 2' bewirken.The smoothing device 30 provided upstream of the applicator 10 is configured as a thermal transfer smoothing device in the present embodiment. It is therefore in principle a heated, smooth surface, which is pressed against the workpiece surface 2 'sliding. However, the smoothing device can also be designed in a completely different manner and cause, for example, a fine grinding of the surface 2 '.

An die Auftrageinrichtung 10 schließt sich die NIR-Aushärtungseinrichtung 50 an, die in der vorliegenden Ausführungsform auf das Aushärten eines durch die Auftrageinrichtung 10 aufgetragenen Lacks ausgelegt ist. Bei andersartigen Beschichtungsmaterialien kann die Aushärtungseinrichtung 50 selbstverständlich an die Anforderungen angepasst werden.The application device 10 is adjoined by the NIR curing device 50, which in the present embodiment is designed to cure a paint applied by the application device 10. In the case of different coating materials, the curing device 50 can, of course, be adapted to the requirements.

Danach folgt die Ink-Jet-Druckeinrichtung 40, die dazu ausgelegt ist, auf das aufgebrachte Beschichtungsmaterial 4 ein gewünschtes Druckbild aufzubringen, beispielsweise eine Holzmaserung oder dergleichen. An diese schließt sich wiederum eine UV-Aushärtungseinrichtung 60 an, die dazu ausgelegt ist, die durch die Ink-Jet-Druckeinrichtung 40 aufgebrachte Tinte auszuhärten bzw. zu trocknen.This is followed by the ink-jet printing device 40, which is designed to apply a desired printed image to the applied coating material 4, for example a wood grain or the like. This in turn is followed by a UV curing device 60, which is designed to cure or dry the ink applied by the ink-jet printing device 40.

Schließlich folgt eine abschließende Lackauftragseinrichtung 70, um bei sehr hochwertigen Produkten das Druckbild der Ink-Jet-Druckeinrichtung 40 zusätzlich durch beispielsweise ein abriebfeste Klartinte oder einen Lack zu versiegeln und schließlich durch eine weitere UV-Aushärtungseinrichtung 60 auszuhärten bzw. zu trocknen.Finally, a final lacquer application device 70 follows, in order to additionally seal the printed image of the ink-jet printing device 40 by, for example, an abrasion-resistant clear ink or a lacquer in the case of very high-grade products, and finally cure or dry it by a further UV curing device 60.

Beim Betrieb der erfindungsgemäßen Vorrichtung 1 wird ein Werkstück 2 an den verschiedenen Komponenten der Vorrichtung 1 unter Einsatz der Fördervorrichtung 20 entlang geführt, und es werden entsprechend den Anforderungen einzelne oder mehrere der oben beschriebenen Bearbeitungsvorgänge an dem Werkstück 2 bzw. der zu bearbeitenden Oberfläche 2' ausgeführt.During operation of the device 1 according to the invention, a workpiece 2 is guided along the various components of the device 1 using the conveying device 20, and according to the requirements, one or more of the above-described machining operations on the workpiece 2 or the surface 2 'to be processed are carried out. executed.

Claims (12)

  1. Device (1) for coating workpieces (2) which preferably consist at least partially of wood, wood-based materials, synthetic material or the like, said device comprising:
    an application means (10) for applying a curable mass(4), in particular a varnish, and
    a conveying means (20) for causing a relative movement between said application means (10) and the respective workpiece (2),
    characterized in that
    said application means (10) comprises at least one micro-nozzle (12) for applying said curable mass (4), and preferably at least one micro-valve,
    said application means (10) comprises at least one pressurized store of curable mass, and
    said at least one micro-valve is arranged between said at least one store and said at least one micro-nozzle (12).
  2. Device according to claim 1, characterized in that said application means (10) comprises at least one micro-valve per micro-nozzle (12), in particular a solenoid micro-valve.
  3. Device according to claim 1 or 2, characterized in that said at least one micro-nozzle (12) has a diameter of at least 50 µm, preferably at least 100 µm.
  4. Device according to any one of the preceding claims, characterized in that said at least one micro-nozzle (12) has a maximum diameter of 300 µm, preferably 200 µm.
  5. Device according to any one of the preceding claims, characterized in that said device has a plurality of micro-nozzles (12) which are preferably arranged in an offset manner in the direction of a relative movement between said application means (10) and the respective workpiece (2).
  6. Device according to any one of the preceding claims, characterized in that said device further comprises a smoothing means (30) for smoothing a surface (2') of the respective workpiece (2) which is to be provided with said curable mass (4).
  7. Device according to any one of the preceding claims, characterized in that said device further comprises a machining means for preferably machining the respective work-piece by way of cutting.
  8. Device according to any one of the preceding claims, characterized in that said device further comprises at least one printing means (40), in particular an ink-jet printing means.
  9. Device according to any one of the preceding claims, characterized in that said device further comprises at least one curing means (50, 60), in particular at least one UV-curing means (60) and/or at least one NIR-curing means (50).
  10. Process for coating workpieces using a device (1) according to any one of the preceding claims, said process comprising the steps of:
    providing a workpiece (2) which preferably consists at least partially of wood, wood-based materials, synthetic material or the like,
    coating said workpiece (2) in the region of its surface (2') with said curable mass (4).
  11. The process according to claim 10, characterized in that said workpiece is first of all preferably machined by way of cutting and is particularly preferred also pre-treated, in particular smoothened, in the region of the surface (2'), and that at least the machined and, optionally, pre-treated region (2') is coated at least in sections with said curable mass (4).
  12. The process according to claim 10 or 11, characterized in that said workpiece (2) is substantially plate- or strip-shaped, and that said workpiece is coated with said curable mass (4) in sections at least in the region of a narrow surface (2'), said narrow surface (2') preferably being at an angle with respect to a large surface (2") of said workpiece.
EP06026431A 2006-12-20 2006-12-20 Method and device for coating workpieces Active EP1935657B1 (en)

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EP06026431A EP1935657B1 (en) 2006-12-20 2006-12-20 Method and device for coating workpieces
ES06026431T ES2402367T3 (en) 2006-12-20 2006-12-20 Device and procedure for coating parts
US11/960,121 US20080152819A1 (en) 2006-12-20 2007-12-19 Device And Process For Coating Workpieces
CNA2007101600116A CN101204690A (en) 2006-12-20 2007-12-20 Method and device for coating workpieces

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EP06026431A EP1935657B1 (en) 2006-12-20 2006-12-20 Method and device for coating workpieces

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EP1935657B1 true EP1935657B1 (en) 2013-02-13

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US20080152819A1 (en) 2008-06-26
ES2402367T3 (en) 2013-05-03
EP1935657A1 (en) 2008-06-25
CN101204690A (en) 2008-06-25

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