EP2198975B1 - Curtain application unit - Google Patents

Curtain application unit Download PDF

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Publication number
EP2198975B1
EP2198975B1 EP09178315A EP09178315A EP2198975B1 EP 2198975 B1 EP2198975 B1 EP 2198975B1 EP 09178315 A EP09178315 A EP 09178315A EP 09178315 A EP09178315 A EP 09178315A EP 2198975 B1 EP2198975 B1 EP 2198975B1
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EP
European Patent Office
Prior art keywords
curtain
chamber
wall
edge
fluid
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Not-in-force
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EP09178315A
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German (de)
French (fr)
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EP2198975A1 (en
Inventor
Robert Reisenauer
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Voith Patent GmbH
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Voith Patent GmbH
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    • 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
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/005—Curtain coaters

Definitions

  • the invention relates to a curtain applicator for coating a running paper, cardboard or other fibrous web, comprising a disposed above the fibrous web and at least the width of the fibrous web corresponding curtain applicator for dispensing at least one liquid to pasty application medium in the form of a on or multilayer curtain, which falls substantially to gravity following the fibrous web, wherein for guiding the curtain across its fall away, ie between a trailing edge of the applicator head and the surface, the fibrous web is provided at its two edges depending an edge guide element, wherein the edge guide element in Width direction of the curtain is adjustable.
  • the invention also relates to a process for curtain coating.
  • a generic device and a method is for example from the DE 197 35 588 known.
  • a separate partial stream of coating color of the inner surface of an immediately adjacent to the outlet slit of the slot nozzle of the curtain guide element is supplied.
  • a separating element is still arranged, which separates the respective edge of the curtain and feels to the outside.
  • An embodiment of a curtain commissioned work is among others from the EP-A1- 1 255 615 known and is referred to in professional circles as "Slide Die", ie Gleit Anlagendüse.
  • This so-called Gleit Anlagense contains at least twosignmediumskammem from which the medium passes via a feed gap, which in turn merges into a slot-shaped outlet nozzle, on a sliding surface of the Gleit Mrsdüse.
  • the application medium emerging from the discharge nozzles arranged in parallel one behind the other overlaps one another. At a trailing edge or as a detachment line to be designated edge of the nozzle, this multilayer separates and falls down as a multilayer curtain either initially on an intermediate guide plate or directly on the substrate to be coated or the surface of the moving fibrous web.
  • the coating width can be equal to or less than the width of the fibrous web, which is referred to as "inboard" -Fahrweise.
  • the curtain width is greater than the width of the fibrous web.
  • edge guide elements bring the curtain, which is about 200m long, close to the fibrous web.
  • edge guide elements including the solutions shown in the cited documents
  • the structures of the edge guide elements are complicated. They are subject to high wear and can also be poorly cleaned.
  • the edge guide element has a cover plate and a bottom plate and consists of two superposed, separate chambers, each having a U-shaped cross section, wherein the first chamber is above the second chamber, the first chamber a fluid or Liquid inlet and the second chamber has a fluid or liquid drain and both chambers are closed at their respective edge of the curtain facing open side of the U-section with a continuous wall such that on the one between the cover plate and the upper edge of the wall in the first Chamber located overflow gap remains. It serves to produce a fluid or liquid film which contacts the respective curtain edge and thereby runs down a drainage surface of the wall.
  • the edge guide element according to the invention and thus also the curtain applicator are characterized by a simple construction. To guide the curtain only a small amount of fluid or liquid is needed. The unwanted color beads at the edges of the surface of the fibrous web are caused by the proper guidance of the curtain and without the curtain is constricted, avoided.
  • the edge guide element in particular its drainage surface contacting the relevant curtain edge, can be easily cleaned due to its simple construction.
  • the cleaning work but also the drainage behavior, if the drainage surface made of stainless steel or aluminum. It is advantageous if this surface is polished or has a roughness value Ra of 0.8 to 1.0.
  • the drainage surface may also be made of plastic, in particular Teflon, which shows a good flow behavior.
  • suction opening is arranged centrally in the drain wall and parallel to the fluid or liquid withdrawal faces.
  • fluid or liquid for the running fluid or liquid film preferably water is provided.
  • a water / coating mixture or, with regard to keeping the drainage surface clean, a mixture which contains surface-active substances, such as commercially available surfactants.
  • the suction opening for the discharged fluid or liquid is about 1 x 5mm in size.
  • This suction opening can be incorporated both vertically and horizontally in the drain wall. Conceivable, however, would be other opening geometries, for example, circular openings. Alternately, in the bottom plate, a lateral slot for a suction or in addition still a paragraph be incorporated.
  • the said overflow gap in the upper chamber is about 10 to 20 mm wide.
  • the bottom plate of the edge guide element is formed obliquely, so that the slope is adapted to the course of a likewise obliquely running fibrous web. It is conceivable that the bottom plate can be adjusted at a desired angle. This gives you the ability to use the marginal guide element, which is very good for the fibrous web running underneath, both for horizontally and obliquely in upwards or downwards running fibrous webs. Conceivable, of course, are also made on stock edge guide elements with differently shaped or slanted at different angles floor panels.
  • edge binding strips according to the invention can be very easily retrofitted into existing curtain coating systems.
  • various embodiments of the curtain dispensing Curtain applicator head such as sliding layer nozzle or slot nozzle as well as single-layered or multi-layered curtain possible.
  • FIG. 1 is a curtain applicator 1 shown for coating a running paper, cardboard or other fibrous web 2 with a liquid to pasty application medium. It includes, in addition to some not shown here with units such as air boundary layer control devices, start-stop-Auffang wornen or tubs, measuring equipment, feeders, etc. above the fibrous web 2 and spaced therefrom arranged and only slightly hinted curtain application head 3.
  • This gun 3 may be formed as a so-called Gleit harshdüse or slot nozzle and is machine width, so over the width of the fibrous web 2 reaching executed.
  • the application head 3 can be designed both for a multi-layer application and for a single-layer application with which a single-layer or multi-layer curtain 4 can be produced.
  • the curtain 4 drops from the tear-off edge 5 of the applicator head 3 substantially following the force of gravity down onto the fibrous web 2 and deposits on its surface as a coating layer AS.
  • the curtain applicator 1 has a lateral, columnar trained edge guide element 6 respectively on the leader side FS and Drive side TS on.
  • This edge guide element 6 serves to guide and also limit the size of the approximately 200 mm long single-layer or multi-layer curtain 4 between the tear-off edge 6 and the surface of the fibrous web 2 at its lateral edges 4a and 4b.
  • the edge guide element 6 is adjustable in the width direction of the curtain 4, as the horizontal double arrows show. In the examples shown, the two edge guide elements 6 are within the width of the fibrous web 2, which is referred to as "inboard" -Fahrweise.
  • FIG. 2 is the edge guide element 6 made FIG. 1 , seen from the side, shown in section. It can be seen that the edge guide element 6 has a cover plate 7 and a bottom plate 8.
  • the edge guide element 6 consists of two superimposed, separate chambers 9 and 10, wherein the first chamber 9 is located above the second chamber 10.
  • the first ie the upper chamber 9 has a fluid or liquid inlet 11 and the second, that is, the lower chamber 10 has a drain 12.
  • Both nozzles or pipes for inlet 11 and outlet 12 point outwards.
  • Both chambers 9 and 10 also have a wall 13 spanning them both. This wall 13 serves the actual guidance of the curtain and therefore contacted with their curtain side facing the respective curtain edge.
  • FIG. 4 It is shown that the chambers 9 and 10 each have a U-shaped cross-section. It can also be seen that the wall 13 has been inserted with its drainage surface 18 in the open side of the U-section facing the curtain edge 4a .4b.
  • overflow gap 15 and / or the suction opening 17 are adjustable in size.
  • the overflow gap is about 10 to 20mm wide. Equally wide is the drainage surface 19 and the wall 13.
  • the suction opening 17 is aligned dare and rectangular. It has a size of 1 x 5mm. In addition, this opening 17 is located directly above the bottom plate and is arranged centrally in the wall 13 parallel to the drain 12.
  • Both chambers 9 and 10 of the edge guide element 6 are otherwise separated from each other by a transverse wall 20.
  • water is preferably used as a fluid or liquid for the running fluid or liquid film 18, which is incidentally also controlled and regulated in its amount.
  • water is preferably used.
  • it is also a water / coating mixture or a mixture of water and surface-active substances, such as commercial surfactants used.
  • FIG. 5 a circuit diagram is shown. This illustrates that the liquid discharged via the outlet 12 of the edge guide element 6 or the fluid or liquid film 18 is sucked to the outside and is fed via a line 21 to a separator 22.
  • the solid-particle-containing liquid is discharged via a drain 23, while the "clean" liquid is sucked out of the separator 22 by means of a vacuum pump 24.
  • This liquid is available as a renewed liquid feed for the edge guide element 6.
  • a flow meter and control valve 25 the desired amount of fluid or liquid is fed via a line to the inlet 11 of the edge guide element.

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Abstract

The unit has an edge guide element (6) provided with a cover plate (7), a base plate (8) and separate chambers (9, 10) arranged on top of each other. The former chamber is located above the latter chamber. The former chamber is provided with a fluid or liquid inlet (11), and the latter chamber is provided with an outlet (12). A suction opening (17) is provided between a lower edge (16) of a wall (13) and a base plate (8). The wall has an outlet surface (19) for a fluid or liquid film (18) at a side pointed to curtain-edges. An independent claim is also included for a method for coating continuous paper and cardboard with liquid- and pasty coating medium.

Description

Die Erfindung betrifft ein Vorhang-Auftragswerk zur Beschichtung einer laufenden Papier-, Karton- oder anderen Faserstoffbahn, aufweisend einen oberhalb der Faserstoffbahn angeordneten und mindestens der Breite der Faserstoffbahn entsprechenden Vorhang-Auftragskopf zur Abgabe wenigstens eines flüssigen bis pastösen Auftragsmediums in Form eines ein- oder mehrschichtigen Vorhangs, der im Wesentlichen der Schwerkraft folgend auf die Faserstoffbahn herabfällt, wobei zur Führung des Vorhangs über seinen Fallweg hinweg, d.h. zwischen einer Abrisskante des Auftragskopfes und der Oberfläche, der Faserstoffbahn an seinen beiden Rändern je ein Randführungselement vorgesehen ist, wobei das Randführungselement in Breitenrichtung des Vorhanges verstellbar ist.
Die Erfindung betrifft auch ein Verfahren zur Vorhangbeschichtung.The invention relates to a curtain applicator for coating a running paper, cardboard or other fibrous web, comprising a disposed above the fibrous web and at least the width of the fibrous web corresponding curtain applicator for dispensing at least one liquid to pasty application medium in the form of a on or multilayer curtain, which falls substantially to gravity following the fibrous web, wherein for guiding the curtain across its fall away, ie between a trailing edge of the applicator head and the surface, the fibrous web is provided at its two edges depending an edge guide element, wherein the edge guide element in Width direction of the curtain is adjustable.
The invention also relates to a process for curtain coating.

Eine gattungsgemäße Vorrichtung und ein Verfahren ist beispielsweise aus der DE 197 35 588 bekannt. In dieser Druckschrift ist offenbart, dass zur Spreizung des Vorhangs an jedem Rand ein getrennter Teilstrom von Streichfarbe der Innenfläche eines unmittelbar neben dem Austrittsspalt der Schlitzdüse des Vorhangs vorhandenen Führungselementes zugeführt wird. Unterhalb des Führungselementes ist noch ein Trennelement angeordnet, das den jeweiligen Rand des Vorhangs abtrennt und nach außen abfühlt.A generic device and a method is for example from the DE 197 35 588 known. In this document it is disclosed that for spreading the curtain at each edge a separate partial stream of coating color of the inner surface of an immediately adjacent to the outlet slit of the slot nozzle of the curtain guide element is supplied. Below the guide element, a separating element is still arranged, which separates the respective edge of the curtain and feels to the outside.

Ebenfalls eine Vorrichtung und ein Verfahren sind aus der DE -A1 102 32 949 sowie der EP-A1-0 907 103 bekannt. Hierbei wurde vorgeschlagen, dass bei einem Vorhang-Auftragsverfahren der vom Vorhang-Auftragswerk abgegebene Vorhang mittels Randführungselemente und entsprechenden abgegebenen Strahlen eines Betriebsmediums, sozusagen als Gleitmittel für die Vorhangränder, geführt wird.Also an apparatus and a method are known from DE -A1 102 32 949 as well as the EP-A1-0 907 103 known. It has been proposed that, in a curtain application process, the curtain delivered by the curtain applicator is guided by means of edge guiding elements and corresponding emitted rays of an operating medium, so to speak as a lubricant for the curtain edges.

Mit den bekannten Vorhäng-Auftragswerken sind mehrere Auftragsmedien bzw. mehrere Schichten eines Auftragsmediums abgebbar. Eine Ausführungsart eines Vorhang-Auftragswerkes ist unter anderem aus der EP- A1- 1 255 615 bekannt und wird in Fachkreisen als "Slide Die", also Gleitschichtdüse bezeichnet. Diese so genannte Gleitschichtdüse enthält mindestens zwei Auftragsmediumskammem, aus denen das Medium jeweils über einen Zufuhrspalt, der wiederum jeweils in eine schlitzförmige Austrittsdüse übergeht, auf eine Gleitfläche der Gleitschichtdüse gelangt. Das aus den parallel hintereinander angeordneten Austrittsdüsen austretende Auftragsmedium legt sich dabei übereinander. An einer Abrisskante oder auch als Ablöselinie zu bezeichnenden Kante der Düse löst sich diese Mehrfachschicht ab und fällt als mehrschichtiger Vorhang herab entweder zunächst auf eine zwischengeschaltete Leitplatte oder direkt auf das zu beschichtende Substrat bzw. die Oberfläche der laufenden Faserstoffbahn.With the known curtain applicators several application media or multiple layers of a job medium can be issued. An embodiment of a curtain commissioned work is among others from the EP-A1- 1 255 615 known and is referred to in professional circles as "Slide Die", ie Gleitschichtdüse. This so-called Gleitschichtdüse contains at least two Auftragmediumskammem from which the medium passes via a feed gap, which in turn merges into a slot-shaped outlet nozzle, on a sliding surface of the Gleitschichtdüse. The application medium emerging from the discharge nozzles arranged in parallel one behind the other overlaps one another. At a trailing edge or as a detachment line to be designated edge of the nozzle, this multilayer separates and falls down as a multilayer curtain either initially on an intermediate guide plate or directly on the substrate to be coated or the surface of the moving fibrous web.

Es sind aber auch andere Ausführungen von Auftragsköpfen bekannt, bei denen eine oder mehrere Schlitzdüsen nach unten in Richtung auf die darunter laufende Faserstoffbahn zeigen. Hierzu wird beispielsweise auf die DE-A1 10012344 für einschichtigen Auftrag und die DE-A1 10359117 für Mehrschichtauftrag verwiesen.But there are also other versions of applicator heads are known in which one or more slot nozzles point down towards the underlying fibrous web. For this purpose, for example, on the DE-A1 10012344 for single-layer order and the DE-A1 10359117 directed for multi-layer order.

Beim Streichen - sowohl beim einschichtigen als auch mehrschichtigen Auftrag - mit dem Vorhang-Auftragswerk (Curtain Coater) kann die Beschichtungsbreite gleich oder auch kleiner als die Breite der Faserstoffbahn sein, was als "inboard"-Fahrweise bezeichnet wird.When painting - both single-layer and multi-layer application - with the Curtain Coater (curtain coater), the coating width can be equal to or less than the width of the fibrous web, which is referred to as "inboard" -Fahrweise.

Bei so genannter "overboard"-Fahrweise ist dagegen die Vorhangbreite größer als die Faserstoffbahnbreite.In the case of the so-called "overboard" approach, on the other hand, the curtain width is greater than the width of the fibrous web.

Insbesondere bei der inboard-Fahrweise sind Randführungselemente, wie sie in beiden erstgenannten Druckschriften offenbart sind, notwendig. Diese Randführungselemente führen den Vorhang, der ca. 200m lang ist, bis nahe an die Faserstoffbahn heran.In particular, in the inboard-driving edge management elements, as disclosed in the first two publications, necessary. These edge guide elements bring the curtain, which is about 200m long, close to the fibrous web.

In der Praxis werden derzeit säulenartige Randführungselemente aus porösem Material eingesetzt. Die als Gleitmittel dienende Fluid- bzw. Flüssigkeit bzw. Wasser ist seiner Menge noch undefiniert. Die verwendete Fluid- bzw. Flüssigkeit muss ständig laufen, weil sonst Verstopfungsgefahr droht. Die benötigte Fluid- bzw. Flüssigkeitsmenge ist dadurch enorm hoch und beträgt ca. 10 bis 15l/h.In practice, columnar edge guide elements of porous material are currently used. The fluid or liquid or water serving as lubricant is still undefined in its quantity. The fluid or fluid used must run constantly, otherwise there is a risk of clogging. The required fluid or The amount of liquid is thus enormously high and is about 10 to 15l / h.

Außerdem sind die Bauweisen der Randführungselemente (auch die in den genannten Druckschriften gezeigten Lösungen) kompliziert. Sie unterliegen einem hohen Verschleiß und lassen sich außerdem noch schlecht reinigen.In addition, the structures of the edge guide elements (including the solutions shown in the cited documents) are complicated. They are subject to high wear and can also be poorly cleaned.

Es ist daher Aufgabe der Erfindung, eine Vorrichtung anzugeben, bei der die Nachteile des Standes der Technik nicht mehr auftreten.It is therefore an object of the invention to provide a device in which the disadvantages of the prior art no longer occur.

Die Aufgabe der Erfindung wird mit einem Vorhang-Auftragswerk mit den Merkmalen des Anspruchs 1 gelöst.The object of the invention is achieved with a curtain applicator with the features of claim 1.

Erfindungsgemäß ist vorgesehen, dass das Randführungselement eine Deckplatte und eine Bodenplatte aufweist und aus zwei übereinander angeordneten, separaten Kammern besteht, die jeweils einen U-förmigen Querschnitt aufweisen, wobei sich die erste Kammer oberhalb der zweiten Kammer befindet, die erste Kammer einen Fluid- bzw. Flüssigkeitszulauf und die zweite Kammer einen Fluid- bzw. Flüssigkeitsablauf aufweist und beide Kammern an ihrer zum jeweiligen Vorhangsrand zeigenden offenen Seite des U-Querschnittes mit einer durchgehenden Wand derart verschlossen sind, dass zum Einen zwischen Deckplatte und Oberkante der Wand ein sich in der ersten Kammer befindlicher Überlaufspalt verbleibt. Er dient zur Erzeugung eines Fluid- bzw. Flüssigkeitsfilmes, der den jeweiligen Vorhangsrand kontaktiert und dabei eine Ablauffläche der Wand herabläuft. Zum Anderen besteht auch zwischen der Unterkante der Außenwand und der Bodenplatte eine sich in der unteren, zweiten Kammer angeordnete, mittige Absaugöffnung, die mit dem Fluid- bzw. Flüssigkeitsablauf in Verbindung steht.According to the invention, the edge guide element has a cover plate and a bottom plate and consists of two superposed, separate chambers, each having a U-shaped cross section, wherein the first chamber is above the second chamber, the first chamber a fluid or Liquid inlet and the second chamber has a fluid or liquid drain and both chambers are closed at their respective edge of the curtain facing open side of the U-section with a continuous wall such that on the one between the cover plate and the upper edge of the wall in the first Chamber located overflow gap remains. It serves to produce a fluid or liquid film which contacts the respective curtain edge and thereby runs down a drainage surface of the wall. On the other hand, there is also between the lower edge of the outer wall and the bottom plate arranged in the lower, second chamber, central suction opening, which is in communication with the fluid or liquid drain.

Das erfindungsgemäße Randführungselement und damit auch das Vorhang-Auftragswerk zeichnen sich durch eine einfache Bauweise aus. Zur Führung des Vorhangs wird nur eine geringe Fluid- bzw. Flüssigkeitsmenge benötigt. Die unerwünschten Farbwülste an den Rändern der Oberfläche der Faserstoffbahn werden durch die einwandfreie Führung des Vorhangs und ohne dass der Vorhang eingeschnürt wird, vermieden.The edge guide element according to the invention and thus also the curtain applicator are characterized by a simple construction. To guide the curtain only a small amount of fluid or liquid is needed. The unwanted color beads at the edges of the surface of the fibrous web are caused by the proper guidance of the curtain and without the curtain is constricted, avoided.

Das Randführungselement, insbesondere seine den betreffenden Vorhangsrand kontaktierende Ablauffläche lässt sich aufgrund seiner/ihrer einfachen Bauweise leicht reinigen.The edge guide element, in particular its drainage surface contacting the relevant curtain edge, can be easily cleaned due to its simple construction.

Vereinfacht wird die Reinigungsarbeit, aber auch das Ablaufverhalten, wenn die Ablauffläche aus Edelstahl oder Aluminium besteht. Vorteilhaft ist es, wenn diese Fläche poliert ist bzw. einen Rauigkeitswert Ra von 0,8 bis 1,0 aufweist. Die Ablauffläche kann allerdings auch aus Kunststoff, insbesondere Teflon gefertigt sein, welches ein gutes Ablaufverhalten zeigt.Simplified is the cleaning work, but also the drainage behavior, if the drainage surface made of stainless steel or aluminum. It is advantageous if this surface is polished or has a roughness value Ra of 0.8 to 1.0. However, the drainage surface may also be made of plastic, in particular Teflon, which shows a good flow behavior.

Hinsichtlich einer variabel einzustellenden Fließmenge des zur Führung bzw. besseren Gleitfähigkeit des Auftragsmediumsvorhangs dienenden Fluid- bzw. Flüssigkeitsfilmes ist es vorteilhaft, wenn der sich in der ersten Kammer befindliche Überlaufspalt und/oder die in der unteren, zweiten Kammer angeordnete Absaugöffnung jeweils in ihrer Größe verstellen lassen.With regard to a variable amount of flow to be used for guiding or better lubricity of the Auftragmediumsvorhangs fluid or liquid film, it is advantageous if the located in the first chamber overflow gap and / or arranged in the lower, second chamber suction respectively adjusted in size to let.

Vorteilhaft ist es, wenn die Absaugöffnung mittig in der Ablaufwand angeordnet ist und parallel dem Fluid- bzw. Flüssigkeitsabzug gegenübersteht. Der Abzug der Fluid- bzw. Flüssigkeit, welches mit Streichfarbenpartikeln und möglicherweise Abriebteilchen behaftet ist, kann dadurch rückstandsfrei erfolgen.It is advantageous if the suction opening is arranged centrally in the drain wall and parallel to the fluid or liquid withdrawal faces. The deduction of the fluid or liquid, which is associated with coating color particles and possibly abrasion particles, can be done without residue.

Als Fluid- bzw. Flüssigkeit für den ablaufenden Fluid- bzw. Flüssigkeitsfilm ist vorzugsweise Wasser vorgesehen. Es kann aber alternativ auch ein Wasser/ Streichfarbengemisch oder hinsichtlich der Sauberhaltung der Ablauffläche auch ein Gemisch, welches oberflächenaktive Substanzen, wie handelsübliche Tenside enthält, Verwendung finden.As fluid or liquid for the running fluid or liquid film preferably water is provided. Alternatively, however, it is also possible to use a water / coating mixture or, with regard to keeping the drainage surface clean, a mixture which contains surface-active substances, such as commercially available surfactants.

Die Absaugöffnung für die abzuführende Fluid- bzw. Flüssigkeit ist ca. 1 x 5mm groß. Diese Absaugöffnung kann sowohl senkrecht, als auch waagerecht in die Ablaufwand eingearbeitet sein. Denkbar wären allerdings auch andere Öffnungsgeometrien, beispielsweise kreisrunde Öffnungen. Alternierend kann in der Bodenplatte ein seitlicher Schlitz für eine Absaugung oder auch zusätzlich noch ein Absatz eingearbeitet sein.The suction opening for the discharged fluid or liquid is about 1 x 5mm in size. This suction opening can be incorporated both vertically and horizontally in the drain wall. Conceivable, however, would be other opening geometries, for example, circular openings. Alternately, in the bottom plate, a lateral slot for a suction or in addition still a paragraph be incorporated.

Der besagte Überlaufspalt in der oberen Kammer ist ca. 10 bis 20 mm breit.The said overflow gap in the upper chamber is about 10 to 20 mm wide.

Vorteilhaft ist es außerdem, wenn die Bodenplatte des Randführungselementes schräg ausgebildet ist, so dass die Schräge an den Verlauf einer ebenfalls schräg laufenden Faserstoffbahn angepasst ist. Dabei ist es denkbar, dass sich die Bodenplatte in einem gewünschten Winkel verstellen läst. Damit hat man die Möglichkeit, das Randführelement, weiches ja sehr nach an die darunter laufende Faserstoffbahn heranreichen soll, sowohl für horizontal, als auch schräg in aufwärtige oder in abwärtige Richtung laufende Faserstoffbahnen einzusetzen. Denkbar sind natürlich auch auf Vorrat gefertigte Randführungselemente mit verschieden ausgebildeten bzw. in verschiedenen Winkeln abgeschrägten Bodenplatten.It is also advantageous if the bottom plate of the edge guide element is formed obliquely, so that the slope is adapted to the course of a likewise obliquely running fibrous web. It is conceivable that the bottom plate can be adjusted at a desired angle. This gives you the ability to use the marginal guide element, which is very good for the fibrous web running underneath, both for horizontally and obliquely in upwards or downwards running fibrous webs. Conceivable, of course, are also made on stock edge guide elements with differently shaped or slanted at different angles floor panels.

Die erfindungsgemäßen Randührungsleisten lassen sich sehr einfach auch nachträglich in bestehende Vorhangstreichanlagen einbauen. Dabei ist die Anwendung verschiedener Ausführungsformen eines den Vorhang abgebenden Vorhang-Auftragskopfes, wie z.B. Gleitschichtdüse oder Schlitzdüse sowie bei einschichtig oder auch mehrschichtig ausgebildetem Vorhang möglich.The edge binding strips according to the invention can be very easily retrofitted into existing curtain coating systems. In this case, the application of various embodiments of the curtain dispensing Curtain applicator head, such as sliding layer nozzle or slot nozzle as well as single-layered or multi-layered curtain possible.

Nachfolgend wird die Erfindung anhand eines Ausführungsbeispieles näher erläutert. Es zeigen in schematischer Darstellung:

Figur 1:
ein erfindungsgemäßes Vorhang-Auftragwerk mit Randführungs- elementen in schematischer perspektivischer Darstellung
Figur 2:
einen Längsschnitt durch ein erfindungsgemäßes Randführungselement aus Figur 1, von der Seite ausgesehen,
Figur 3:
einen Längsschnitt durch ein erfindungsgemäßes Randführungs- element aus Figur 1, von vorn gesehen,
Figur 4:
einen Querschnitt durch das Randführungselement gem. Figur 3,
Figur 5:
ein Flüssigkeitskreislauf-Schema für das Vorhang-Auftragswerk gem. Figur 1
The invention will be explained in more detail with reference to an embodiment. In a schematic representation:
FIG. 1:
an inventive curtain applicator with edge guiding elements in a schematic perspective view
FIG. 2:
a longitudinal section through an inventive edge guide element FIG. 1 , viewed from the side,
FIG. 3:
a longitudinal section through an inventive Randführungs- element FIG. 1 , seen from the front,
FIG. 4:
a cross section through the edge guide element acc. FIG. 3 .
FIG. 5:
a liquid circulation scheme for the curtain applicator acc. FIG. 1

In der Figur 1 ist ein Vorhang-Auftragswerk 1 zur Beschichtung einer laufenden Papier-, Karton- oder anderen Faserstoffbahn 2 mit einem flüssigen bis pastösen Auftragsmedium gezeigt. Es umfasst neben einigen hier nicht mit dargestellten Einheiten, wie Luftgrenzschicht-Bekämpfungseinrichtungen, Start-Stopp-Auffangeinrichtungen bzw. Wannen, Messeinrichtungen, Zuführleitungen usw. einen oberhalb der Faserstoffbahn 2 und von ihr beabstandet angeordneten und nur ansatzweise angedeuteten Vorhang-Auftragskopf 3. Dieser Auftragskopf 3 kann als so genannte Gleitschichtdüse oder Schlitzdüse ausgebildet sein und ist maschinenbreit, also über die Breite der Faserstoffbahn 2 reichend, ausgeführt. Der Auftragskopf 3 kann sowohl für einen Mehrschichtauftrag als auch für einschichtigen Auftrag ausgebildet sein mit dem ein ein- oder mehrschichtigen Vorhang 4 erzeugbar ist. Der Vorhang 4 fällt von der Abrisskante 5 des Auftragskopfes 3 aus im Wesentlichen der Schwerkraft folgend, auf die Faserstoffbahn 2 herab und legt sich auf deren Oberfläche als Auftragsschicht AS ab.In the FIG. 1 is a curtain applicator 1 shown for coating a running paper, cardboard or other fibrous web 2 with a liquid to pasty application medium. It includes, in addition to some not shown here with units such as air boundary layer control devices, start-stop-Auffangeinrichtungen or tubs, measuring equipment, feeders, etc. above the fibrous web 2 and spaced therefrom arranged and only slightly hinted curtain application head 3. This gun 3 may be formed as a so-called Gleitschichtdüse or slot nozzle and is machine width, so over the width of the fibrous web 2 reaching executed. The application head 3 can be designed both for a multi-layer application and for a single-layer application with which a single-layer or multi-layer curtain 4 can be produced. The curtain 4 drops from the tear-off edge 5 of the applicator head 3 substantially following the force of gravity down onto the fibrous web 2 and deposits on its surface as a coating layer AS.

Wie aus Figur 1 zu entnehmen ist, weist das Vorhang-Auftragswerk 1 ein seitliches, säulenartig ausgebildetes Randführungselement 6 jeweils an Führerseite FS und Triebseite TS auf. Diese Randführungselement 6 dient der Führung und auch Formatbegrenzung des ca. 200mm langen ein- oder mehrschichtigen Vorhanges 4 zwischen der Abrisskante 6 und der Oberfläche der Faserstoffbahn 2 an seinen seitlichen Rändern 4a und 4b.How out FIG. 1 can be seen, the curtain applicator 1 has a lateral, columnar trained edge guide element 6 respectively on the leader side FS and Drive side TS on. This edge guide element 6 serves to guide and also limit the size of the approximately 200 mm long single-layer or multi-layer curtain 4 between the tear-off edge 6 and the surface of the fibrous web 2 at its lateral edges 4a and 4b.

Die Randführungselement 6 ist in Breitenrichtung des Vorhanges 4 verstellbar, wie die waagerechten Doppelpfeile zeigen. Im gezeigten Beispielen befinden sich die beiden Randführungselemente 6 innerhalb der Breite der Faserstoffbahn 2, was als "inboard"-Fahrweise bezeichnet wird.The edge guide element 6 is adjustable in the width direction of the curtain 4, as the horizontal double arrows show. In the examples shown, the two edge guide elements 6 are within the width of the fibrous web 2, which is referred to as "inboard" -Fahrweise.

In Figur 2 ist das Randführungselement 6 aus Figur 1, von der Seite aus gesehen, im Schnitt gezeigt. Man erkennt, dass das Randführungselement 6 eine Deckplatte 7 und eine Bodenplatte 8 aufweist. Das Randführungselement 6 besteht aus zwei übereinander angeordneten, separaten Kammern 9 und 10, wobei sich die erste Kammer 9 oberhalb der zweiten Kammer 10 befindet.In FIG. 2 is the edge guide element 6 made FIG. 1 , seen from the side, shown in section. It can be seen that the edge guide element 6 has a cover plate 7 and a bottom plate 8. The edge guide element 6 consists of two superimposed, separate chambers 9 and 10, wherein the first chamber 9 is located above the second chamber 10.

In Figur 3 ist deutlicher zu sehen, dass die erste, d.h. die obere Kammer 9 einen Fluid- bzw. Flüssigkeitszulauf 11 und die zweite, also untere Kammer 10 einen Ablauf 12 aufweist. Beide Stutzen bzw. Rohre für Zulauf 11 und Ablauf 12 weisen nach außen. Beide Kammern 9 und 10 weisen auch eine sie beide überspannende Wand 13 auf. Diese Wand 13 dient der eigentlichen Führung des Vorhangs und kontaktiert mit ihrer den Vorhang zugewandten Seite daher den jeweiligen Vorhangsrand.In FIG. 3 It can be seen more clearly that the first, ie the upper chamber 9 has a fluid or liquid inlet 11 and the second, that is, the lower chamber 10 has a drain 12. Both nozzles or pipes for inlet 11 and outlet 12 point outwards. Both chambers 9 and 10 also have a wall 13 spanning them both. This wall 13 serves the actual guidance of the curtain and therefore contacted with their curtain side facing the respective curtain edge.

Wie in beiden Figuren 2 und 3 zu erkennen, ist das hohle Randführungselement 6 bzw. sind ihre Kammern 9 und 10 derart verschlossen, dass nur zwischen der Deckplatte 7 und der Oberkante 14 der Wand 13 ein sich in der ersten Kammer 9 befindlicher Überlaufspalt 15 verbleibt. Außerdem befindet sich zwischen der Unterkante 16 der Wand 13 und der Bodenplatte 8 eine damit in der unteren, zweiten Kammer 10 angeordnete Absaugöffnung 17. Diese Absaugöffnung steht mit dem Ablauf 12 in Verbindung steht. Aufgrund der über den schmalen Überlaufspalt 15 geleiteten Fluids entsteht ein sehr dünner, aber gleichmäßiger Fluid- bzw. Flüssigkeitsfilm 18, der an der Innenseite des Randführelementes 6 bzw. besser gesagt an einer Ablauffläche 19 der Wand 13 herabfließt und den jeweiligen Vorhangsrand, kontaktiert und dadurch führt, wobei der Vorhang 4 in den Figuren 2 und 3 nicht mit dargestellt ist.As in both FIGS. 2 and 3 to recognize, is the hollow edge guide element 6 and their chambers 9 and 10 are closed so that only between the cover plate 7 and the upper edge 14 of the wall 13, a located in the first chamber 9 overflow gap 15 remains. In addition, located between the lower edge 16 of the wall 13 and the bottom plate 8 so arranged in the lower, second chamber 10 suction opening 17. This suction is in communication with the drain 12. Due to the guided over the narrow overflow gap 15 fluid results in a very thin, but uniform fluid or liquid film 18, on the inside of the edge guide element 6 and better said flowing down on a run-off surface 19 of the wall 13 and the respective curtain edge, contacted and thereby leads, wherein the curtain 4 in the FIGS. 2 and 3 not shown with.

In Figur 4 ist gezeigt, dass die Kammern 9 und 10 jeweils einen U-förmigen Querschnitt aufweisen. Man erkennt außerdem, dass sich die Wand 13 mit ihrer Ablauffläche 18 in die zum Vorhangsrand 4a bzw.4b zeigende offenen Seite des U-Querschnittes eingefügt worden ist.In FIG. 4 It is shown that the chambers 9 and 10 each have a U-shaped cross-section. It can also be seen that the wall 13 has been inserted with its drainage surface 18 in the open side of the U-section facing the curtain edge 4a bzw.4b.

Die Ablauffläche 19 der Wand 13 besteht im Beispiel aus Edelstahl mit einem Rauigkeitswert Ra= 0,8-1,0, was sich hinsichtlich Verschmutzung der Ablauffläche 19 und Ablaufverhalten des Filmes sehr positiv auswirkt.The drainage surface 19 of the wall 13 consists in the example of stainless steel with a roughness value Ra = 0.8-1.0, which has a very positive effect on pollution of the drainage surface 19 and flow behavior of the film.

Zu erwähnen ist noch, dass der Überlaufspalt 15 und/oder die Absaugöffnung 17 in ihrer Größe verstellbar sind. Der Überlaufspalt ist ca. 10- 20mm breit. Ebenso breit ist auch die Ablauffläche 19 bzw. die Wand 13.It should also be mentioned that the overflow gap 15 and / or the suction opening 17 are adjustable in size. The overflow gap is about 10 to 20mm wide. Equally wide is the drainage surface 19 and the wall 13.

Im Beispiel ist die Absaugöffnung 17 wagerecht ausgerichtet und rechteckig gestaltet. Sie weist eine Größe von 1 x 5mm auf. Außerdem befindet sich diese Öffnung 17 unmittelbar oberhalb der Bodenplatte und ist mittig in der Wand 13 parallel zum Ablauf 12 angeordnet.In the example, the suction opening 17 is aligned dare and rectangular. It has a size of 1 x 5mm. In addition, this opening 17 is located directly above the bottom plate and is arranged centrally in the wall 13 parallel to the drain 12.

Beide Kammern 9 und 10 des Randführungselements 6 sind im Übrigen durch eine Querwand 20 voneinander getrennt.Both chambers 9 and 10 of the edge guide element 6 are otherwise separated from each other by a transverse wall 20.

Als Fluid- bzw. Flüssigkeit für den ablaufenden Fluid- bzw. Flüssigkeitsfilm 18, der in seiner Menge übrigens auch steuer- und regelbar ist, wird vorzugsweise Wasser verwendet. Es ist aber auch ein Wasser/Streichfarbengemisch oder ein Gemisch aus Wasser und oberflächenaktiven Substanzen, wie handelsübliche Tenside verwendbar.As a fluid or liquid for the running fluid or liquid film 18, which is incidentally also controlled and regulated in its amount, water is preferably used. However, it is also a water / coating mixture or a mixture of water and surface-active substances, such as commercial surfactants used.

Mit dem erfindungsgemäßen Randführungselement 6 wird eine Vorhangsbreite eingestellt, die geringer als die Breite der Faserstoffbahn 2 ist.With the edge guide element 6 according to the invention a curtain width set, which is smaller than the width of the fibrous web 2.

In Figur 5 ist ein Kreislaufschema dargestellt. Dieses verdeutlicht, dass die über den Ablauf 12 des Randführungselements 6 abgeführte Flüssigkeit bzw. der Fluid- bzw. Flüssigkeitsfilm 18 nach außen abgesaugt wird und über eine Leitung 21 einem Abscheider 22 zugeführt wird. Die mit festen Partikeln behaftete Flüssigkeit wird über einen Ablauf 23 abgeführt, während die "saubere" Flüssigkeit mittels einer Vakuumpumpe 24 aus dem Abscheider 22 gesaugt wird. Diese Flüssigkeit steht als erneuter Flüssigkeitszulauf für das Randführelement 6 zur Verfügung. Mit einem Durchflussmesser und Regelventil 25 wird die gewünschte Fluid- bzw. Flüssigkeitsmenge über eine Leitung dem Zulauf 11 des Randführungselementes zugeführt.In FIG. 5 a circuit diagram is shown. This illustrates that the liquid discharged via the outlet 12 of the edge guide element 6 or the fluid or liquid film 18 is sucked to the outside and is fed via a line 21 to a separator 22. The solid-particle-containing liquid is discharged via a drain 23, while the "clean" liquid is sucked out of the separator 22 by means of a vacuum pump 24. This liquid is available as a renewed liquid feed for the edge guide element 6. With a flow meter and control valve 25, the desired amount of fluid or liquid is fed via a line to the inlet 11 of the edge guide element.

Bezugszeichen listeReference number list

11
Vorhang-AuftragswerkCurtain applicator
22
FaserstoffbahnFibrous web
33
Vorhang-AuftragskopfCurtain applicator head
44
Vorhangcurtain
4a, 4b4a, 4b
seitlicher Vorhangrandlateral curtain edge
55
Abrisskantetear-off edge
66
RandführungselementEdge guide element
77
Deckplattecover plate
88th
Bodenplattebaseplate
99
erste Kammerfirst chamber
1010
zweite Kammersecond chamber
1111
Fluid- bzw. FlüssigkeitszulaufFluid or liquid feed
1212
Ablaufprocedure
1313
Wandwall
1414
Oberkantetop edge
1515
ÜberlaufspaltOverflow gap
1616
Unterkantelower edge
1717
Absaugöffnungsuction
1818
Fluid- bzw. FlüssigkeitsfilmFluid or liquid film
1919
Ablaufflächedrainage area
2020
Querwandpartition
2121
Leitungmanagement
2222
Abscheiderseparators
2323
Ablaufprocedure
2424
Vakuumpumpevacuum pump
2525
Regelventilcontrol valve
LL
Längsrichtunglongitudinal direction
MM
Auftragsmediumapplication medium
FSFS
Führerseitetender side
TSTS
Triebseitedrive side

Claims (10)

  1. Curtain applicator (1) for coating a moving paper, board or other fibrous web (2), having a curtain applicator head (3) which is arranged above the fibrous web (2) and corresponds at least to the width of the fibrous web (2) for dispensing at least one liquid to pasty application medium (M) in the form of a single-layer or multiple-layer curtain (4) which falls onto the fibrous web (2) in a manner which substantially follows gravity, in each case one edge guiding element (6) being provided to guide the curtain (4) over its falling path, that is to say between a breakaway edge (5) of the applicator head (3) and the surface of the fibrous web (2) at the two edges (4a, 4b) of the said curtain, the edge guiding element (6) being adjustable as desired in the width direction of the curtain (4),
    characterized in that
    the edge guiding element (6) has a top plate (7) and a bottom plate (8) and comprises two separate chambers (9, 10) arranged one above the other, the first chamber (9) being located above the second chamber (10), the first chamber (9) having a fluid or liquid feed (11) and the second chamber (10) having a discharge (12), and both chambers (9, 10) being closed by a wall (13) in such a way that there remain only an overflow slot (15) belonging to the first chamber (9) between the top plate (7) and the upper edge (14) of the wall (13) in order to produce a fluid or liquid film (18), and also an extraction opening (17) arranged in the lower, second chamber (10) between the lower edge (16) of the wall (13) and the bottom plate (8), and the wall (13) has a run-off surface (19) for the fluid or liquid film (18) on the side of the said wall that points towards the respective curtain edge (4a, 4b).
  2. Curtain applicator according to Claim 1,
    characterized in that
    the first chamber (9) and the second chamber (10) in each case have a U-shaped cross section, the wall (13) being let into the open side of the U-shaped cross section.
  3. Curtain applicator according to Claim 1 or 2,
    characterized in that
    the first chamber (9) and the second chamber (10) are separated from each other by a transverse wall (20).
  4. Curtain applicator according to either of Claims 1 and 2,
    characterized in that
    the run-off surface (19) of the wall (13) is polished and consists of a material such as stainless steel or aluminium or of a plastic, such as Teflon.
  5. Curtain applicator according to Claim 4,
    characterized in that
    the run-off surface (19) has a roughness Ra of about 0.8 to 1.0.
  6. Curtain applicator according to one of Claims 1 to 5,
    characterized in that
    the size of the overflow slot (15) and/or the extraction opening (17) can be adjusted.
  7. Curtain applicator according to one of Claims 1 to 6,
    characterized in that
    the extraction opening (17) is located centrally in the wall (13) and immediately above the bottom plate (8).
  8. Curtain applicator according to one of Claims 1 to 7,
    characterized in that
    the fluid or liquid which can be used for the fluid or liquid film (18) that runs off is preferably water but also a water/coating colour mixture or a mixture of water and surface active substances, such as commercially available surfactants.
  9. Curtain applicator according to one of the preceding claims,
    characterized in that
    the extraction opening (17) is about 1 x 5 mm in size and is machined vertically or horizontally into the wall (13).
  10. Curtain applicator according to one of the preceding claims,
    characterized in that
    the overflow slot (15) and also the run-off surface (19) are 10 to 20 mm wide.
EP09178315A 2008-12-18 2009-12-08 Curtain application unit Not-in-force EP2198975B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102008054892A DE102008054892A1 (en) 2008-12-18 2008-12-18 Curtain applicator

Publications (2)

Publication Number Publication Date
EP2198975A1 EP2198975A1 (en) 2010-06-23
EP2198975B1 true EP2198975B1 (en) 2012-05-02

Family

ID=41566261

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09178315A Not-in-force EP2198975B1 (en) 2008-12-18 2009-12-08 Curtain application unit

Country Status (3)

Country Link
EP (1) EP2198975B1 (en)
AT (1) ATE555858T1 (en)
DE (1) DE102008054892A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010031576A1 (en) 2010-07-20 2012-01-26 Voith Patent Gmbh Curtain applicator
EP3180475B2 (en) 2014-08-15 2021-11-03 Voith Patent GmbH Coating device

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5390900A (en) * 1994-04-26 1995-02-21 Int Rolling Mill Consultants Metal strip cooling system
DE19735588A1 (en) 1997-04-21 1999-02-18 Jagenberg Papiertech Gmbh Coating a moving web
DE59702151D1 (en) * 1997-10-03 2000-09-14 Troller Schweizer Engineering Process and apparatus for curtain coating of a moving support
SE515824C2 (en) 2000-01-26 2001-10-15 Tetra Laval Holdings & Finance Method for manufacturing a multilayered packaging laminate by wet coating, as well as laminates made according to the procedure
DE10012344A1 (en) 2000-03-14 2001-09-20 Voith Paper Patent Gmbh Continuous liquid curtain coating, for paper or card operates under specified conditions of temperature, pressure and viscosity, leaving thin wet film on surface
DE10117668A1 (en) * 2001-04-09 2002-10-10 Bachofen & Meier Ag Buelach Device for coating a running material web
DE10232949A1 (en) 2002-07-19 2004-01-29 Voith Paper Patent Gmbh Web coating curtain applicator, for wide paper/cardboard webs moving at high speeds, has side guides with jet openings to stabilize the falling curtain coating to give a consistent edge coating application
DE10359117A1 (en) 2003-12-17 2005-07-28 Voith Paper Patent Gmbh Curtain applicator unit
DE102004056270A1 (en) * 2004-11-22 2006-05-24 Basf Ag Side guide for the curtain coating
FI121189B (en) * 2007-10-17 2010-08-13 Metso Paper Inc Edge Guide and Method for Extending the Life of Curtain Edge Edge Guide

Also Published As

Publication number Publication date
DE102008054892A1 (en) 2010-06-24
ATE555858T1 (en) 2012-05-15
EP2198975A1 (en) 2010-06-23

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