EP2412501A1 - Device for coating workpieces - Google Patents

Device for coating workpieces Download PDF

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Publication number
EP2412501A1
EP2412501A1 EP11005025A EP11005025A EP2412501A1 EP 2412501 A1 EP2412501 A1 EP 2412501A1 EP 11005025 A EP11005025 A EP 11005025A EP 11005025 A EP11005025 A EP 11005025A EP 2412501 A1 EP2412501 A1 EP 2412501A1
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EP
European Patent Office
Prior art keywords
plasma
coating
nozzles
feed direction
nozzle
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Granted
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EP11005025A
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German (de)
French (fr)
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EP2412501B1 (en
Inventor
Wilfried Hollmer
Helmut Hucke
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IMA Klessmann GmbH
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IMA Klessmann GmbH
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    • 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
    • B27D5/003—Other working of veneer or plywood specially adapted to veneer or plywood securing a veneer strip to a panel edge

Definitions

  • the invention relates to a device for coating workpieces.
  • edge band and plate are brought together to form a joint gap in a joint zone and firmly connected to each other, wherein edge band and workpiece are thereby moved relative to each other.
  • edge band is transferred to an adhesive state.
  • plasma radiation has recently also been used to melt the functional layer.
  • the functional layer of the edge band is heated with a radiation or flame emerging from a plasma nozzle.
  • the distance between edge band and plasma nozzle is important in order to achieve an optimal melting result.
  • edge band In relative movement between edge band and workpiece, therefore, the edge band is guided past the plasma nozzle, so that in the longitudinal direction of the edge band, a homogeneous irradiation is realized.
  • the nozzles can not be placed arbitrarily close to each other due to space constraints, so that in the exiting rays or flames adjacent nozzles usually remains too low radiation intensity left to sufficiently melt the functional layer , Consequently, one makes do with a diagonal arrangement of the nozzles, as they are in the FIG. 2 is shown.
  • the edge band 2 is guided in the direction X, the nozzles 3a are arranged at an angle to the edge band 2 in a row, which is indicated by the dashed line D.
  • the individual nozzles 3a or their effective regions on the edge band 2 in the transverse direction Z of the edge strip 2 move closer to one another than would be the case with a perpendicular to the longitudinal or feed direction X of the edge band 2.
  • this configuration also has shortcomings on.
  • the improvement of the homogeneity in the direction Z leads to a deterioration in the homogeneity in the direction X, since the material sections of the edge band 2 melted by the individual nozzles 3a on the way to the point P, at which it comes into contact with the workpiece, have different distances have covered.
  • the portion of material (in the region of the upper edge 2a) heated by the front nozzle 3a in series D travels a lesser distance to P and is warmer than the portion of material heated by the nozzle D in the row D (in the region of the lower nozzle) Edge 2b).
  • the resulting temperature gradient is disadvantageous.
  • the object of the present invention is therefore to provide a device for coating workpieces, in which the mentioned disadvantages are at least reduced.
  • nozzles can be arranged in two parallel or inclined in each case in the same direction rows.
  • the at least two rows can also be inclined in opposite directions, resulting in, for example, a V-shaped arrangement of the plasma nozzles. It is important in every case that so many nozzles are provided, that in each case the coating material lies over its full width in the effective range of the plasma nozzles.
  • the openings of at least one plasma nozzle to be slit-shaped or slot-shaped, with an opening longitudinal extent, which takes place substantially transversely to the feed direction such that the coating lies completely within the effective range of the plasma nozzle. It can be provided in succession in the feed direction a plurality of nozzles with different sized or long nozzle openings in order to work with the effective range of the plasma nozzles different width coatings can.
  • the plasma nozzles of all embodiments can be turned on or off individually in order to be able to use in particular coatings such as edge bands or the like with different widths transversely to the feed direction.
  • FIG. 1 the coating process or the device used for this purpose is shown.
  • the plate 1, whose narrow side is to be coated with the edge band 2 is fed in a direction X '.
  • From a magazine is transported via a feeder 6 usually stored on a roll edge band 2 in the direction X towards the plate 1 and added in the region of a joining zone F to the narrow plate side and pressed against the plate 1 by means of printing tools such as the pinch roller 4, wherein the pressure primarily perpendicular to the direction X 'of the plate 1 in a direction Y' is exercised.
  • P describes the area at which the edge band 2 contacts the panel 1 at the end of the joining zone F. To connect plate 1 and edge band 2, these are moved relative to each other.
  • a functional layer (not shown) provided on the edge band is activated. This is done by irradiating the same with a plasma source 3 which generates plasma jets and / or a flame which emerges through plasma jets (referred to below as nozzles) 3a in the direction of the edge band 2 (essentially in the direction Y transverse to the direction X) and to strike at the same thing.
  • a plasma source 3 which generates plasma jets and / or a flame which emerges through plasma jets (referred to below as nozzles) 3a in the direction of the edge band 2 (essentially in the direction Y transverse to the direction X) and to strike at the same thing.
  • the distance between the edge band 2 and the plasma source 3 can optionally be varied, either by moving the source 3 or by moving the guide 5 of the edge band 2 opposite the plasma source 3 by the irradiation
  • the edge band 2 is melted up or melted in the region of its functional layer as a result of the heat development, thereby rendering it "sticky” or liable.
  • the so-melted edge band 2 is pressed against the narrow side of the plate 1 as described above.
  • the functional layer solidifies and melts with the plate 1.
  • FIG. 3 are two (not necessarily parallel) nozzle rows D with the nozzles 3a and D 'shown with the nozzles 3a', which are angled or inclined to the running direction X of the edge strip 2 and to its transverse direction Z and in particular with the direction X about the angle form ⁇ or ⁇ '.
  • this arrangement is opposite to in FIG. 2
  • a larger area of the edge band 2 in the effective region of the plasma nozzles 3a, 3a ' so that the melting is more effective.
  • this arrangement achieves an overlap of the effective range of the nozzles of the row D and those of the row D ', which are not available in the prior art.
  • banding in the longitudinal direction X on the edge band 2 can be reduced by varying the heat input over the width of the edge band.
  • This can also be done by moving the rows of nozzles, such as the row D 'opposite to in FIG. 3 shown Configuration is offset by half the distance A (Z component of the distance between two nozzles 3a) in the Z direction.
  • the entire nozzle assembly which is preferably provided on a block to vibrate in the Z direction, move or swing to achieve the spaces between "stripes" on the edge band 2.
  • FIG. 4 An alternative is in the FIG. 4 where also combinations with the in FIG. 3 embodiment shown are conceivable.
  • the nozzles are activatable such that the edge band lies in the effective range of the plasma nozzles 3a, 3a "over its entire width, which is defined by the distance in the Z direction between its upper edge 2a and its lower edge 2b (this applies to all embodiments discussed here).
  • FIG. 2 well-known single-row form, that thereby the The distance between the first and the last nozzle in the running or feed direction X can be reduced, whereby the initially mentioned temporal offset between the heating of the edge region located in the effective region of the frontmost nozzle and the heating of the regions located further behind can be reduced and a more homogeneous melting result can be achieved.
  • FIG. 4 shown arrangement much more flexible, especially if wider edge bands 2 are to be used.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Coating Apparatus (AREA)
  • Plasma Technology (AREA)

Abstract

The device comprises a plasma source (3) with plasma nozzles (3a), by which a functional layer of a coating (2) is heated or activated. The plasma nozzles are arranged in a primary row and a secondary row one behind the other. The two rows of plasma nozzles extend at an angle to the feed direction (X). The angle of the two rows of the plasma nozzles is equal in size to the feed direction.

Description

Die Erfindung betrifft eine Vorrichtung zur Beschichtung von Werkstücken.The invention relates to a device for coating workpieces.

Bei der Beschichtung von Schmalseiten von plattenförmigen Erzeugnissen mittels sogenannten Kantenbändern werden Kantenband und Platte aneinander unter Bildung eines Fügespaltes in einer Fügezone zusammengeführt und miteinander fest verbunden, wobei Kantenband und Werkstück dabei relativ zueinander verschoben werden. Dabei wird das Kantenband in einen haftenden Zustand überführt. Dies wurde in der Vergangenheit durch einen Schmelzkleberauftrag erreicht. Inzwischen ist es Stand der Technik, eine Funktionsschicht des Kantenbandes vor dem Fügen an das Werkstück durch Strahlung anzuschmelzen und dann durch Druck mit dem Werkstück zu verbinden.In the coating of narrow sides of plate-shaped products by means of so-called edge bands edge band and plate are brought together to form a joint gap in a joint zone and firmly connected to each other, wherein edge band and workpiece are thereby moved relative to each other. In this case, the edge band is transferred to an adhesive state. This has been achieved in the past by a hot melt application. Meanwhile, it is state of the art to melt a functional layer of the edge band before joining to the workpiece by radiation and then to connect by pressure with the workpiece.

Zum Anschmelzen der Funktionsschicht wird neben Laserstrahlung neuerdings auch Plasmastrahlung verwendet. Dabei wird die Funktionsschicht des Kantenbandes mit einer aus einer Plasmadüse austretenden Strahlung oder Flamme erwärmt. Gerade bei dem Einsatz der Plasmatechnik ist der Abstand zwischen Kantenband und Plasmadüse wichtig, um ein optimales Aufschmelzergebnis zu erzielen. Ebenso ist es wichtig, das Anschmelzen der Funktionsschicht über dessen Fläche so homogen wie möglich zu gestalten, da ansonsten die Aktivierung und infolgedessen die Verbindung mit dem Werkstück ungleichmäßig erfolgt, was insbesondere lokal dazu führen kann, dass sich das Kantenband nach dem Fügen an das Werkstück wieder von diesem lösen kann. Dies kann einerseits dadurch geschehen, dass die Funktionsschicht unvollständig angeschmolzen wird und ihre Haftwirkung gar nicht entfalten kann, andererseits kann ein zu intensives Aussetzen der Plasmastrahlung/Flamme dazu führen, dass die Funktionsschicht verbrennt und ebenfalls ihrer Funktion nicht mehr nachkommt.In addition to laser radiation, plasma radiation has recently also been used to melt the functional layer. The functional layer of the edge band is heated with a radiation or flame emerging from a plasma nozzle. Especially with the use of plasma technology, the distance between edge band and plasma nozzle is important in order to achieve an optimal melting result. Likewise, it is important to make the melting of the functional layer over its surface as homogeneous as possible, since otherwise the activation and consequently the connection with the workpiece takes place unevenly, which in particular can locally lead to the edge band after joining to the workpiece can solve this again. This can on the one hand thereby happen that the functional layer is incompletely melted and its adhesion can not develop, on the other hand, too intense exposure of the plasma radiation / flame cause the functional layer burns and also no longer fulfills its function.

Bei relativer Bewegung zwischen Kantenband und Werkstück wird deshalb das Kantenband an der Plasmadüse vorbei geführt, so dass in Längsrichtung des Kantenbandes eine homogene Bestrahlung realisiert wird. Allerdings ist es auch wichtig, die Bestrahlung homogen über die Querrichtung des Kantenbandes zu realisieren. Dies ist mit einer Düse, welche einen runden Öffnungsquerschnitt aufweist, nicht möglich. Zwar besteht die Möglichkeit eine Mehrzahl Düsen in Querrichtung des Kantenbandes nebeneinander anzuordnen, jedoch können die Düsen bauraumbedingt nicht beliebig nah aneinander gesetzt werden, so dass bei den austretenden Strahlen oder Flammen benachbarter Düsen im Regelfall eine zu geringe Strahlungsintensität übrig bleibt, um die Funktionsschicht ausreichend anzuschmelzen. Man behilft sich dabei folglich mit einer Diagonalanordnung der Düsen, wie sie in der Figur 2 dargestellt ist. Das Kantenband 2 wird in Richtung X geführt, die Düsen 3a sind gewinkelt zum Kantenband 2 in einer Reihe angeordnet, welche durch die gestrichelte Linie D angedeutet ist. So kann erreicht werden, dass die einzelnen Düsen 3a bzw. deren Wirkbereiche auf dem Kantenband 2 in Querrichtung Z des Kantenbandes 2 betrachtet näher aneinander rücken, als dies bei einer senkrecht zur Längs- oder Vorschubrichtung X des Kantenbandes 2 der Fall wäre. Allerdings weist diese Konfiguration auch Unzulänglichkeiten auf. Denn die Verbesserung der Homogenität in Richtung Z bewirkt umgekehrt eine Verschlechterung der Homogenität in Richtung X, da die von den einzelnen Düsen 3a aufgeschmolzenen Materialanschnitte des Kantenbandes 2 auf dem Weg zu dem Punkt P, an welchem es mit dem Werkstück in Kontakt gerät, unterschiedliche Entfernungen zurückgelegt haben. Anders ausgedrückt, der von der in Reihe D vorderen Düse 3a erwärmte Materialabschnitt (im Bereich des oberen Randes 2a) legt bis P einen geringeren Weg zurück und ist wärmer als der von der in der Reihe D hinteren Düse 3a erwärmte Materialabschnitt (im Bereich des unteren Randes 2b). Das resultierende Temperaturgefälle ist nachteilig.In relative movement between edge band and workpiece, therefore, the edge band is guided past the plasma nozzle, so that in the longitudinal direction of the edge band, a homogeneous irradiation is realized. However, it is also important to realize the irradiation homogeneously over the transverse direction of the edge band. This is not possible with a nozzle which has a round opening cross-section. Although it is possible to arrange a plurality of nozzles in the transverse direction of the edge band side by side, however, the nozzles can not be placed arbitrarily close to each other due to space constraints, so that in the exiting rays or flames adjacent nozzles usually remains too low radiation intensity left to sufficiently melt the functional layer , Consequently, one makes do with a diagonal arrangement of the nozzles, as they are in the FIG. 2 is shown. The edge band 2 is guided in the direction X, the nozzles 3a are arranged at an angle to the edge band 2 in a row, which is indicated by the dashed line D. Thus, it can be achieved that the individual nozzles 3a or their effective regions on the edge band 2 in the transverse direction Z of the edge strip 2 move closer to one another than would be the case with a perpendicular to the longitudinal or feed direction X of the edge band 2. However, this configuration also has shortcomings on. Conversely, the improvement of the homogeneity in the direction Z leads to a deterioration in the homogeneity in the direction X, since the material sections of the edge band 2 melted by the individual nozzles 3a on the way to the point P, at which it comes into contact with the workpiece, have different distances have covered. In other words, the portion of material (in the region of the upper edge 2a) heated by the front nozzle 3a in series D travels a lesser distance to P and is warmer than the portion of material heated by the nozzle D in the row D (in the region of the lower nozzle) Edge 2b). The resulting temperature gradient is disadvantageous.

Aufgabe der vorliegenden Erfindung ist es daher, eine Vorrichtung zur Beschichtung von Werkstücken anzugeben, bei welcher die erwähnten Nachteile wenigstens verringert werden.The object of the present invention is therefore to provide a device for coating workpieces, in which the mentioned disadvantages are at least reduced.

Gelöst wird diese Aufgabe durch eine Vorrichtung mit den Merkmalen der Ansprüche 1 und 6. Vorteilhafte Ausführungsformen finden sich in den Unteransprüchen.This object is achieved by a device having the features of claims 1 and 6. Advantageous embodiments can be found in the subclaims.

Erfindungsgemäß ist in einer ersten Ausführungsform vorgesehen, die Plasmadüsen in wenigstens zwei diagonal zur Vorschubrichtung verlaufenden Reihen anzuordnen. Dabei können gemäß einer Alternative Düsen in zwei parallelen oder jeweils in dieselbe Richtung geneigten Reihen angeordnet sein. Alternativ oder ergänzend hierzu können die wenigstens zwei Reihen auch entgegengesetzt geneigt sein, so dass sich beispielsweise eine V-förmige Anordnung der Plasmadüsen ergibt. Wichtig ist in jedem Fall, dass so viele Düsen vorgesehen sind, dass in jedem Fall das Beschichtungsmaterial über dessen volle Breite im Wirkbereich der Plasmadüsen liegt.According to the invention, it is provided in a first embodiment to arrange the plasma nozzles in at least two rows extending diagonally to the feed direction. In this case, according to an alternative nozzles can be arranged in two parallel or inclined in each case in the same direction rows. Alternatively or additionally, the at least two rows can also be inclined in opposite directions, resulting in, for example, a V-shaped arrangement of the plasma nozzles. It is important in every case that so many nozzles are provided, that in each case the coating material lies over its full width in the effective range of the plasma nozzles.

Gemäß einer weiteren Ausführungsform ist vorgesehen, die Öffnungen wenigstens einer Plasmadüse spalt- oder schlitzförmig, mit einer Öffnungslängserstreckung vorzusehen, welche im Wesentlichen quer zur Vorschubrichtung so erfolgt, dass die Beschichtung vollständig im Wirkbereich der Plasmadüse liegt. Es können hintereinander in Vorschubrichtung mehrere Düsen mit unterschiedlich großen bzw. langen Düsenöffnungen vorgesehen sein, um mit dem Wirkbereich der Plasmadüsen unterschiedlich breite Beschichtungen bearbeiten zu können.According to a further embodiment, provision is made for the openings of at least one plasma nozzle to be slit-shaped or slot-shaped, with an opening longitudinal extent, which takes place substantially transversely to the feed direction such that the coating lies completely within the effective range of the plasma nozzle. It can be provided in succession in the feed direction a plurality of nozzles with different sized or long nozzle openings in order to work with the effective range of the plasma nozzles different width coatings can.

Bevorzugt können die Plasmadüsen aller Ausführungsformen individuell ein- bzw. ausgeschaltet werden, um insbesondere Beschichtungen wie Kantenbänder oder dergleichen mit quer zur Vorschubrichtung verschiedener Breite einsetzen zu können.Preferably, the plasma nozzles of all embodiments can be turned on or off individually in order to be able to use in particular coatings such as edge bands or the like with different widths transversely to the feed direction.

Die Erfindung wird nachfolgend anhand der Ausführungsbeispiele in den Zeichnungsfiguren 1, 3 und 4 schematisch näher erläutert. Die Erfindung betrifft allgemein das Anbringen von Beschichtungen auf Werkstücken. Nachfolgend wird beispielhaft, aber nicht einschränkend für Beschichtung der Begriff Kantenband und für Werkstück der Begriff Platte verwendet.

  • Figur 1 zeigt eine schematische Ansicht der erfindungsgemäßen Vorrichtung als Draufsicht.
  • Figur 2 zeigt eine Plasmadüsenanordnung nach dem Stand der Technik.
  • Figur 3 zeigt eine erfindungsgemäße Plasmadüsenanordnung.
  • Figur 4 zeigt eine weitere erfindungsgemäße Plasmadüsenanordnung.
The invention will be explained in more detail below with reference to the embodiments in the drawing figures 1, 3 and 4. The invention generally relates to the application of coatings to workpieces. The term edge band is used below by way of example, but not restrictively, and the term plate is used for the workpiece.
  • FIG. 1 shows a schematic view of the device according to the invention as a plan view.
  • FIG. 2 shows a plasma nozzle assembly according to the prior art.
  • FIG. 3 shows a plasma nozzle assembly according to the invention.
  • FIG. 4 shows a further inventive plasma nozzle assembly.

In der Figur 1 ist der Beschichtungsvorgang bzw. die dazu verwendete Vorrichtung dargestellt. Die Platte 1, deren Schmalseite mit dem Kantenband 2 beschichtet werden soll, wird in einer Richtung X' zugeführt. Aus einem Magazin wird über eine Zuführeinrichtung 6 das üblicherweise auf einer Rolle bevorratete Kantenband 2 in Richtung X zur Platte 1 hin transportiert und im Bereich einer Fügezone F an die Plattenschmalseite angefügt sowie an die Platte 1 mittels Druckwerkzeugen wie der Andruckrolle 4 angedrückt, wobei der Druck vorrangig senkrecht zur Laufrichtung X' der Platte 1 in einer Richtung Y' ausgeübt wird. P beschreibt den Bereich, an welchem am Ende der Fügezone F der Kontakt des Kantenbandes 2 mit der Platte 1 erfolgt. Zur Verbindung von Platte 1 und Kantenband 2 werden diese relativ zueinander bewegt. Vor dem Fügen wird eine am Kantenband vorgesehene Funktionsschicht (nicht gezeigt) aktiviert. Dies geschieht mittels Bestrahlen derselben mit einer Plasmaquelle 3, welche Plasmastrahlen und/oder eine Flamme erzeugt, welche durch Plasmadüsen (kurz im Folgenden Düsen genannt) 3a in Richtung auf das Kantenband 2 (im Wesentlichen also in Richtung Y quer zur Laufrichtung X) austreten und auf dasselbe auftreffen. Der Abstand zwischen Kantenband 2 und Plasmaquelle 3 kann ggf. variiert werden, entweder durch Bewegen der Quelle 3 oder durch Bewegen der der Plasmaquelle 3 gegenüberliegenden Führung 5 des Kantenbandes 2. Durch die Bestrahlung mit dem aus den Düsen 3a austretenden Plasmastrahlen bzw. daraus erzeugten Flammen wird infolge der Wärmeentwicklung das Kantenband 2 im Bereich seiner Funktionsschicht auf- oder angeschmolzen und dadurch "klebrig" oder haftbar gemacht. Das so angeschmolzene Kantenband 2 wird gegen die Schmalseite der Platte 1 gedrückt wie oben beschrieben. Die Funktionsschicht verfestigt sich und verschmilzt mit der Platte 1.In the FIG. 1 the coating process or the device used for this purpose is shown. The plate 1, whose narrow side is to be coated with the edge band 2, is fed in a direction X '. From a magazine is transported via a feeder 6 usually stored on a roll edge band 2 in the direction X towards the plate 1 and added in the region of a joining zone F to the narrow plate side and pressed against the plate 1 by means of printing tools such as the pinch roller 4, wherein the pressure primarily perpendicular to the direction X 'of the plate 1 in a direction Y' is exercised. P describes the area at which the edge band 2 contacts the panel 1 at the end of the joining zone F. To connect plate 1 and edge band 2, these are moved relative to each other. Before joining, a functional layer (not shown) provided on the edge band is activated. This is done by irradiating the same with a plasma source 3 which generates plasma jets and / or a flame which emerges through plasma jets (referred to below as nozzles) 3a in the direction of the edge band 2 (essentially in the direction Y transverse to the direction X) and to strike at the same thing. The distance between the edge band 2 and the plasma source 3 can optionally be varied, either by moving the source 3 or by moving the guide 5 of the edge band 2 opposite the plasma source 3 by the irradiation With the plasma jets emerging from the jets 3a and the flames generated therefrom, the edge band 2 is melted up or melted in the region of its functional layer as a result of the heat development, thereby rendering it "sticky" or liable. The so-melted edge band 2 is pressed against the narrow side of the plate 1 as described above. The functional layer solidifies and melts with the plate 1.

Bevorzugt werden für die Anordnung der Plasmadüsen 3a die in den Figuren 3 und 4 gezeigten Geometrien gewählt.Are preferred for the arrangement of the plasma nozzles 3a in the FIGS. 3 and 4 selected geometries selected.

In Figur 3 sind zwei (nicht notwendigerweise parallele) Düsenreihen D mit den Düsen 3a und D' mit den Düsen 3a' dargestellt, die zur Laufrichtung X des Kantenbandes 2 bzw. zu dessen Querrichtung Z gewinkelt oder schräg angeordnet sind und insbesondere mit der Laufrichtung X etwa die Winkel α bzw. α' bilden. Durch diese Anordnung liegt gegenüber dem in Figur 2 gezeigten Stand der Technik (siehe oben) beim Durchlauf des Kantenbandes durch den Bereich zwischen Plasmaquelle 3 und Führung 5 ein größerer Bereich des Kantenbandes 2 im Wirkbereich der Plasmadüsen 3a, 3a', so dass das Aufschmelzen effektiver wird. Insbesondere erreicht man durch diese Anordnung eine Überschneidung des Wirkbereiches der Düsen der Reihe D und denen der Reihe D', die beim Stand der Technik nicht zur Verfügung stehen. So kann insbesondere auch eine Streifenbildung in Längsrichtung X auf dem Kantenband 2 durch über die Breite des Kantenbandes variierenden Wärmeeintrag reduziert werden. Dies kann auch durch Versetzen der Düsenreihen geschehen, indem etwa die Reihe D' gegenüber der in Figur 3 gezeigten Konfiguration um den halben Abstand A (Z-Komponente des Abstandes zweier Düsen 3a) in Z-Richtung versetzt wird. Hierdurch überlappen die Wirkbereiche der einzelnen Düsen, so dass ein homogeneres Aufschmelzen der Funktionsschicht des Kantenbandes 2 möglich ist. Es ist auch alternativ oder ergänzend hierzu möglich, die komplette Düsenanordnung, die bevorzugt an einem Block vorgesehen ist, in Z-Richtung vibrieren, bewegen oder schwingen zu lassen, um die Zwischenräume zwischen "Streifen" auf dem Kantenband 2 zu erreichen.In FIG. 3 are two (not necessarily parallel) nozzle rows D with the nozzles 3a and D 'shown with the nozzles 3a', which are angled or inclined to the running direction X of the edge strip 2 and to its transverse direction Z and in particular with the direction X about the angle form α or α '. By this arrangement is opposite to in FIG. 2 As shown in the prior art (see above) during the passage of the edge band through the area between the plasma source 3 and guide 5, a larger area of the edge band 2 in the effective region of the plasma nozzles 3a, 3a ', so that the melting is more effective. In particular, this arrangement achieves an overlap of the effective range of the nozzles of the row D and those of the row D ', which are not available in the prior art. In particular, banding in the longitudinal direction X on the edge band 2 can be reduced by varying the heat input over the width of the edge band. This can also be done by moving the rows of nozzles, such as the row D 'opposite to in FIG. 3 shown Configuration is offset by half the distance A (Z component of the distance between two nozzles 3a) in the Z direction. As a result, overlap the effective ranges of the individual nozzles, so that a more homogeneous melting of the functional layer of the edge strip 2 is possible. It is also alternatively or additionally possible, the entire nozzle assembly, which is preferably provided on a block to vibrate in the Z direction, move or swing to achieve the spaces between "stripes" on the edge band 2.

Eine Alternative ist in der Figur 4 gezeigt, wobei auch Kombinationen mit der in Figur 3 gezeigten Ausführungsform denkbar sind. Auch die Möglichkeiten der Vibration, der Bewegung oder des Schwingenlassens der Düsen 3a, 3a', 3a" sind bei dieser Ausführungsform ergänzend denkbar. In Figur 4 sind die beiden Düsenreihen D, D" entgegengesetzt zueinander geneigt, so dass sie etwa eine V-Form bilden, deren Schenkel die einzelnen Düsenreihen bilden. Wobei (wie auch in den obigen Ausführungsformen generell möglich) die Düsen auch hier einzeln aktivierbar bzw. deaktivierbar sind. Wesentlich ist, dass die Düsen so aktivierbar sind, dass das Kantenband über seine gesamte Breite, die durch den Abstand in Z-Richtung zwischen dessen oberen Rand 2a und dessen unteren Rand 2b definiert ist, im Wirkbereich der Plasmadüsen 3a, 3a " liegt (dies gilt für alle hier diskutierten Ausführungsbeispiele). Im gezeigten Beispiel sind die jeweils äußersten Düsen der V-Form, die Düsen 3b und 3b " im Bereich des oberen Randes 2a bzw. des unteren Randes 2b. Die gezeigte Ausführungsform hat den Vorteil gegenüber der im Stand der Technik gem. Figur 2 bekannten einreihigen Form, dass sich dadurch der Abstand der ersten zur letzten Düse in Lauf- bzw. Vorschubrichtung X verringern lässt, wodurch der eingangs angesprochene zeitliche Versatz zwischen der Erwärmung des im Wirkbereich der vordersten Düse befindlichen Kantenbandabschnitts und der Erwärmung der weiter hinten liegenden Bereiche verringert und ein homogeneres Aufschmelzergebnis erzielt werden kann. Zudem ist die in Figur 4 gezeigte Anordnung wesentlich flexibler, wenn insbesondere breitere Kantenbänder 2 eingesetzt werden sollen.An alternative is in the FIG. 4 where also combinations with the in FIG. 3 embodiment shown are conceivable. The possibilities of vibration, of movement or of the oscillation of the nozzles 3a, 3a ', 3a "are additionally conceivable in this embodiment FIG. 4 the two rows of nozzles D, D "are inclined in opposite directions so that they form approximately a V-shape whose legs form the individual row of nozzles, whereby (as is generally possible in the above embodiments), the nozzles can also be individually activated or deactivated here It is essential that the nozzles are activatable such that the edge band lies in the effective range of the plasma nozzles 3a, 3a "over its entire width, which is defined by the distance in the Z direction between its upper edge 2a and its lower edge 2b ( this applies to all embodiments discussed here). In the example shown, the outermost nozzles of the V-shape, the nozzles 3b and 3b "are in the region of the upper edge 2a and the lower edge 2b, respectively. FIG. 2 well-known single-row form, that thereby the The distance between the first and the last nozzle in the running or feed direction X can be reduced, whereby the initially mentioned temporal offset between the heating of the edge region located in the effective region of the frontmost nozzle and the heating of the regions located further behind can be reduced and a more homogeneous melting result can be achieved. In addition, the in FIG. 4 shown arrangement much more flexible, especially if wider edge bands 2 are to be used.

Claims (14)

Vorrichtung zur Beschichtung von Werkstücken (1) aus Holz oder Holzaustauschstoffen mit einer Beschichtung (2), insbesondere zur Bekantung der Schmalseiten plattenförmiger Werkstücke (1) mit einem Kantenband (2), wobei die Vorrichtung eine Plasmaquelle (3) mit Plasmadüsen (3a; 3a'; 3a'') aufweist, mittels derer eine Funktionsschicht der Beschichtung (2) erwärmt oder aktiviert wird und unter Andrücken gegen das Werkstück (1) im Bereich einer Fügezone (F) mittels einer Andruckvorrichtung (4) mit dem Werkstück (1) bei Relativbewegung entlang einer Vorschubrichtung (X) von Werkstück (1) und Beschichtung (2) verbunden wird, wobei die Plasmadüsen (3a; 3a'; 3a") in einer ersten Reihe (D) und in wenigstens einer zweiten Reihe (D'; D'') hintereinander angeordnet sind, wobei sich die erste und die zweite Reihe von Plasmadüsen (3a; 3a'; 3a'') jeweils in einem Winkel (α; α'; α'') zur Vorschubrichtung (X) erstrecken, wobei wenigstens eine Reihe (3a; 3a') aus so vielen Düsen gebildet ist, dass die Reihe (3a; 3a') die zwischen zwei gegenüberliegenden, in Vorschubrichtung (X) verlaufenden Seiten (2a, 2b) der Beschichtung (2) definierte Breite der Beschichtung (2) vollständig im Wirkbereich der Plasmadüsen (3a; 3a') liegt, und/oder wenigstens zwei Reihen (D, D'') die beiden Schenkel einer etwa V-förmigen Anordnung von Plasmadüsen (3a; 3a'') bilden, wobei die Spannweite der V-förmigen Anordnung so gewählt ist, dass die zwischen zwei gegenüberliegenden, in Vorschubrichtung (X) verlaufenden Seiten (2a, 2b) der Beschichtung (2) definierte Breite der Beschichtung (2) vollständig im Wirkbereich der Plasmadüsen (3a; 3a") liegt.Apparatus for coating workpieces (1) made of wood or wood substitutes with a coating (2), in particular for edging the narrow sides of plate-shaped workpieces (1) with an edge band (2), the apparatus comprising a plasma source (3) with plasma nozzles (3a; ';3a''), by means of which a functional layer of the coating (2) is heated or activated and under pressure against the workpiece (1) in the region of a joining zone (F) by means of a pressure device (4) with the workpiece (1) Relative movement along a feed direction (X) of the workpiece (1) and coating (2) is connected, wherein the plasma nozzles (3a, 3a ', 3a ") in a first row (D) and at least one second row (D'; D '') are arranged one behind the other, wherein the first and the second row of plasma nozzles (3a, 3a ', 3a'') each extend at an angle (α; α', α '') to the feed direction (X), wherein at least a row (3a, 3a ') formed from so many nozzles is that the row (3a; 3a ') the width of the coating (2) defined between two opposite sides (2a, 2b) of the coating (2) running in the feed direction (X) is completely within the effective range of the plasma nozzles (3a, 3a'), and / or at least two Rows (D, D '') form the two legs of an approximately V-shaped arrangement of plasma nozzles (3a, 3a ''), wherein the span of the V-shaped arrangement is selected so that between two opposite, in the feed direction (X ) extending sides (2a, 2b) of the coating (2) defined width of the coating (2) lies completely within the effective range of the plasma nozzles (3a, 3a "). Vorrichtung nach Anspruch 1,
dadurch gekennzeichnet,
dass die Winkel (α; α', α'') der ersten und zweiten Reihe Plasmadüsen (3a; 3a', 3a'') zur Vorschubrichtung gleich groß sind.Device according to claim 1,
characterized,
in that the angles (α; α ', α'') of the first and second row of plasma nozzles (3a; 3a', 3a '') are equal to the feed direction. Vorrichtung nach Anspruch 1 oder 2,
dadurch gekennzeichnet,
dass die Plasmadüsen an einem Düsenblock (3) montiert sind.Apparatus according to claim 1 or 2,
characterized,
that the plasma jets are mounted on a nozzle block (3). Vorrichtung nach einem der vorherigen Ansprüche,
dadurch gekennzeichnet,
dass eine Führungseinrichtung (5) für die Beschichtung (2) vorgesehen ist, wobei die Führungseinrichtung (5) den Plasmadüsen (3a, 3a', 3a'') zugewandt und so ausgebildet ist, dass die durch die Führungseinrichtung geführte Beschichtung (2) in einem definierten Abstand zu den Plasmadüsen (3a, 3a', 3a'') gehalten wird.Device according to one of the preceding claims,
characterized,
in that a guide device (5) is provided for the coating (2), wherein the guide device (5) faces the plasma nozzles (3a, 3a ', 3a'') and is designed so that the coating (2) guided through the guide device is in a defined distance to the plasma nozzles (3a, 3a ', 3a'') is maintained. Vorrichtung nach Anspruch 4,
dadurch gekennzeichnet,
dass der relative Abstand zwischen Beschichtung (2) und Plasmadüsen (3a, 3a', 3a") variabel ist.Device according to claim 4,
characterized,
that the relative distance between coating (2) and plasma nozzles (3a, 3a ', 3a ") is variable. Vorrichtung zur Beschichtung von Werkstücken (1) aus Holz oder Holzaustauschstoffen mit einer Beschichtung (2), insbesondere zur Bekantung der Schmalseiten plattenförmiger Werkstücke (1) mit einem Kantenband (2), wobei die Vorrichtung eine Plasmaquelle (3) mit wenigstens einer Plasmadüse aufweist, mittels derer eine Funktionsschicht der Beschichtung (2) erwärmt oder aktiviert wird und unter Andrücken gegen das Werkstück (1) im Bereich einer Fügezone (F) mittels einer Andruckvorrichtung (4) mit dem Werkstück (1) bei Relativbewegung entlang einer Vorschubrichtung (X) von Werkstück (1) und Beschichtung (2) verbunden wird, wobei die wenigstens eine Plasmadüse so ausgebildet ist, dass der aus ihr austretende Plasmastrahl oder die aus ihr austretende Flamme so dimensioniert ist, dass die in Vorschubrichtung (X) verlaufenden Seiten (2a, 2b) der Beschichtung (2) definierte Breite der Beschichtung (2) vollständig im Wirkbereich der Plasmadüse liegt.Apparatus for coating workpieces (1) made of wood or wood substitutes with a coating (2), in particular for edging the narrow sides of plate-shaped workpieces (1) with an edge band (2), wherein the device comprises a plasma source (3) with at least one plasma nozzle, by means of which a functional layer of the coating (2) is heated or activated and under pressure against the workpiece (1) in the region of a joining zone (F) by means of a pressure device (4) is connected to the workpiece (1) during relative movement along a feed direction (X) of the workpiece (1) and coating (2), wherein the at least one plasma nozzle is formed so that the emerging from her plasma jet or emerging from it Flame is dimensioned so that in the feed direction (X) extending sides (2a, 2b) of the coating (2) defined width of the coating (2) is completely within the effective range of the plasma nozzle. Vorrichtung nach Anspruch 6,
dadurch gekennzeichnet,
dass die wenigstens eine Plasmadüse eine schlitz- oder spaltförmige Düsenöffnung aufweist.Device according to claim 6,
characterized,
the at least one plasma nozzle has a slit-or slot-shaped nozzle opening. Vorrichtung nach Anspruch 7,
dadurch gekennzeichnet,
dass die Längserstreckung der Düsenöffnung im Wesentlichen in einer Richtung (Z) quer zur Vorschubrichtung (X) verläuft.Device according to claim 7,
characterized,
in that the longitudinal extension of the nozzle opening extends substantially in one direction (Z) transversely to the feed direction (X). Vorrichtung nach Anspruch 6, 7 oder 8,
dadurch gekennzeichnet,
dass eine Mehrzahl Plasmadüsen vorgesehen sind.Apparatus according to claim 6, 7 or 8,
characterized,
that a plurality of plasma nozzles are provided. Vorrichtung nach Anspruch 9,
dadurch gekennzeichnet,
dass die Plasmadüsen in Vorschubrichtung hintereinander angeordnet sind.Device according to claim 9,
characterized,
that the plasma nozzles are arranged in the feed direction one behind the other. Vorrichtung nach einem der vorherigen Ansprüche,
dadurch gekennzeichnet,
dass die Plasmadüsen Öffnungen unterschiedlicher Größe aufweisen.Device according to one of the preceding claims,
characterized,
that the plasma nozzle openings have different sizes. Vorrichtung nach einem der vorherigen Ansprüche,
dadurch gekennzeichnet,
dass die Plasmadüsen so ausgelegt sind, dass sie einzeln oder in Gruppen ein- oder ausgeschaltet werden können.Device according to one of the preceding claims,
characterized,
that the plasma jets are designed so that they can be switched on or off individually or in groups. Vorrichtung nach einem der vorherigen Ansprüche,
dadurch gekennzeichnet,
dass die Plasmadüsen wenigstens senkrecht zur Vorschubrichtung (X) beweglich angeordnet sind, um in Schwingungen versetzt werden zu können.Device according to one of the preceding claims,
characterized,
that the plasma jet at least perpendicular to the feed direction (X) are movably arranged to be vibrated to. Vorrichtung nach einem der vorherigen Ansprüche,
dadurch gekennzeichnet,
dass die Düsenreihen (D, D') in Richtung (Z) quer zur Vorschubrichtung (X) zueinander versetzt angeordnet sind.Device according to one of the preceding claims,
characterized,
in that the rows of nozzles (D, D ') are arranged offset from one another in the direction (Z) transversely to the feed direction (X).
EP20110005025 2010-07-30 2011-06-21 Device for coating workpieces Not-in-force EP2412501B1 (en)

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US10807121B2 (en) 2012-08-03 2020-10-20 Homag Gmbh Method and device for coating workpieces
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