EP1377391B1 - Device for coating a moving material web - Google Patents

Device for coating a moving material web Download PDF

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Publication number
EP1377391B1
EP1377391B1 EP02730107A EP02730107A EP1377391B1 EP 1377391 B1 EP1377391 B1 EP 1377391B1 EP 02730107 A EP02730107 A EP 02730107A EP 02730107 A EP02730107 A EP 02730107A EP 1377391 B1 EP1377391 B1 EP 1377391B1
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EP
European Patent Office
Prior art keywords
extraction
web
curtain
guide element
slot
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EP02730107A
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German (de)
French (fr)
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EP1377391A1 (en
Inventor
Rolf Metzger
Luca Frediani
Bruno Holtmann
Hans Hardegger
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Bachofen and Meier AG Maschinenfabrik
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Bachofen and Meier AG Maschinenfabrik
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05CAPPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C5/00Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/005Curtain coaters
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S118/00Coating apparatus
    • Y10S118/04Curtain coater

Definitions

  • the invention relates to a device for coating a running material web with a slot die, from which the coating material emerges in a free-falling curtain and which has a downwardly extending guide element for the edge of the curtain on each side immediately adjacent to the outlet gap, and with one in the edge region the sheet arranged element for sucking off coating material which is fixed to the lower end of each guide element and which leads to a suction duct connected to a suction channel, which opens into a suction slot which extends at the lower end of the inside of the suction element perpendicular to the curtain plane .
  • Plastic or metal foils are known as curtain coaters, in which the Coating material (plastic dispersions, pigment coating, etc.) from a Slot nozzle is applied in a free-falling curtain on the web.
  • the Coating material plastic dispersions, pigment coating, etc.
  • the two curtain edges each with a from the slot nozzle down to near the web extending Guide element to guide.
  • the two guide elements are strip-shaped designed, with their curtain facing inside surface is formed.
  • WO-A-98/47630 is a device of the generic type for application of dispersions on a material web, at a distance behind the Slot nozzle in each edge region of the web an element for suction of dispersion is arranged. It will be in the height and across the web direction positionable suction nozzles used, which the additional order at the two web edges aspirate.
  • the additional application of coating material is caused by that the free-falling curtain something at its edges at the end of the edge guides constricts and thus the order on the web in these areas is slightly thicker and such a marginal bulge arises. This effect is called neck in.
  • the additional order at the edges leads to undesirable profile fluctuations of the coated Web and can cause problems in a subsequent dryer or when rolling up lead the coated web.
  • the invention is based on the object, a coating device of generic type to improve so that with structurally simplified design a uniform application of coating material over the entire web width with straight and sharp coating edges is possible.
  • the coating device shown in the figures is used for applying a Dispersion adhesive (eg an acrylate) in aqueous solution to a siliconized paper web. Due to their advantageous properties, the Device also for applying other dispersions to paper webs or metal or plastic films, as well as for coating paper or board webs with Insert coating color.
  • a Dispersion adhesive eg an acrylate
  • the device includes a slot nozzle 1, which is above the barrel of the coated Web is suspended in the frame of the device.
  • the slot 1 is connected to a Feeder for coating material connected and has at its bottom one over the coating width extending exit gap 3, from which the Coating emerges and forms a free-falling curtain, which on the Railway surface drops.
  • each guide element 2 On each side of the slit nozzle 1 is immediately adjacent to the exit slit 3 a fixed strip-shaped guide element 2, which extends down to near the railway extends.
  • Each guide element 2 has a curtain facing Inside on, with an influential auxiliary fluid, for example, with Water or coating material can be rinsed. Everybody points this out Guide element 2 above the outlet gap 3 of the slot 1 a through hole 4, which is connected to a supply line 5, via which the auxiliary liquid is supplied. Inside, the through hole 4 opens into a above the Exit slit 3 vertically downwardly extending channel 14, the outlet opening is located at the level of the exit gap 3 immediately adjacent to this.
  • the feed channel 14 is structurally simply realized so that on the outer surface of the side wall of Slot nozzle 1 is a vertical longitudinal groove formed when attaching the Guide element 2 is sealed to the side wall.
  • each guide element 2 is designed in the form of a strip and has a Thickness of 0.1 mm - 3 mm and a width of about 10 to 20 mm.
  • the length of the Guide element 2 is adapted to the height of the curtain, ie the distance of the Exit slit of the web to be coated. In the present embodiment is the drop height of the curtain and thus the downwardly extending free Length of each guide element 2 between 50 mm and 250 mm.
  • Essential for the invention is that at the lower end of each guide element 2 a Absaugeelement 6 is fixed, the curtain facing the inside with the Inside the guide element 2 is aligned. The on the guide element 2 and The curtain edge flowing down on the suction element 6 then becomes so not disturbed his way to the train.
  • a suction 7 which is connected to a suction line 8.
  • Suction channel 7 is arranged at the lower end of the suction element 6 and opens in a suction slot 9, at the lower end of the inside of the suction element 6 runs perpendicular to the curtain.
  • the length measured in the web running direction Suction slot 9 is 0.5 mm to 15 mm, preferably 5 mm to 12 mm, so that the Extraction function ensured with appropriate variations of the curtain remains. Its height is 0.1 mm to 2 mm, preferably 0.5 mm to 1 mm. He is at the Bottom of the suction element 6 is arranged so that its distance from the web 0, 1 mm to 3 mm. So that this small distance can be maintained is the suction channel 7 below with a thin, only slightly against the web inclined bottom 10 closed in the suction slot 9 with a sharp edge ends. The suction of the thickened edge of the coating material takes place in this way essentially in a horizontal direction. This has the advantage that the the Suction counteracting forces are minimal and at the same time the edge at Suction is not smeared. The further horizontal guidance without dead spaces of the Suction channel 7 acts deposits of aspirated coating material opposite.
  • a suitable rinsing liquid for example with water, rinsed.
  • two flushing lines 11 lead parallel to the Suction 8 to the suction slot 9, which in front of these in the Suction channel 7 open.
  • the rinsing liquid is sucked together with the Coating material led away via the suction line 8.
  • the suction line 8 is connected to a pump.
  • the two guide elements 2 are made of a made limited flexible, elastically bendable material, preferably made of spring steel.
  • each guide element 2 extends outside with small distance a support bar 12 parallel to the guide member 2 down, the is also attached to the side wall of the slit nozzle 1.
  • the support bar 12 is made a stiff material, for example made of sufficiently thick steel and ends at a small distance in front of the suction element 6.
  • In the lower part of the Support strip 12 is a movable from the outside against the guide element 2 adjustment stored, in the example an adjusting screw 13.
  • the adjusting screw 13th can be the free end of the guide element 2 with the attached thereto Absaugelement 6 limited adjust transversely to the web running direction to the position of the Exhaust slot 9 can be set exactly.
  • Absaugelement 6 limited adjust transversely to the web running direction to the position of the Exhaust slot 9 can be set exactly.
  • the Adjustment also the course of the guide element 2 limited vary to the Adjust the guidance and posture of the curtain edge optimally.

Description

Technisches GebietTechnical area

Die Erfindung betrifft eine Vorrichtung zum Beschichten einer laufenden Materialbahn mit einer Schlitzdüse, aus der das Beschichtungsmaterial in einem freifallenden Vorhang austritt und die an jeder Seite unmittelbar neben dem Austrittsspalt ein sich nach unten erstreckendes Führungselement für den Rand des Vorhangs aufweist, und mit einem im Randbereich der Bahn angeordneten Element zum Absaugen von Beschichtungsmaterial, das am unteren Ende jedes Führungselementes befestigt ist und das ein an eine Saugleitung angeschlossenen Absaugkanal führt, der in einen Absaugschlitz mündet, der am unteren Ende der Innenseite des Absaugelementes senkrecht zur Vorhangebene verläuft.The invention relates to a device for coating a running material web with a slot die, from which the coating material emerges in a free-falling curtain and which has a downwardly extending guide element for the edge of the curtain on each side immediately adjacent to the outlet gap, and with one in the edge region the sheet arranged element for sucking off coating material which is fixed to the lower end of each guide element and which leads to a suction duct connected to a suction channel, which opens into a suction slot which extends at the lower end of the inside of the suction element perpendicular to the curtain plane .

Stand der TechnikState of the art

Zum Beschichten laufender Materialbahnen, wie Papier- oder Kartonbahnen, Kunststoff- oder Metallfolien sind sogenannte Curtain-Coater bekannt, bei denen das Beschichtungsmaterial (Kunststoffdispersionen, Pigmentstreichfarbe etc.) aus einer Schlitzdüse in einem freifallenden Vorhang auf die Materialbahn aufgetragen wird. Um einen stabilen und über die Beschichtungsbreite gleichmäßigen Vorhang zu erzeugen, ist es aus der WO-A-99/09253 bekannt, die beiden Vorhangränder jeweils mit einem sich von der Schlitzdüse nach unten bis in die Nähe der Materialbahn erstreckenden Führungselement zu führen. Die beiden Führungselemente sind leistenförmig gestaltet, wobei ihre dem Vorhang zugewandte Innenseite flächig ausgebildet ist. Damit der Vorhang besser an den Führungselementen haftet und so einem Einschnüren an den Vorhangrändern entgegengewirkt wird, ist es aus der DE-A-197 35 558 bekannt, die Innenseite jedes Führungselementes mit einer die Oberflächenspannung beeinflussenden Hilfsflüssigkeit, beispielsweise mit Wasser oder Beschichtungsmaterial, zu benetzen. For coating running material webs, such as paper or cardboard webs, Plastic or metal foils are known as curtain coaters, in which the Coating material (plastic dispersions, pigment coating, etc.) from a Slot nozzle is applied in a free-falling curtain on the web. Around to produce a stable curtain which is uniform over the coating width, it is known from WO-A-99/09253, the two curtain edges each with a from the slot nozzle down to near the web extending Guide element to guide. The two guide elements are strip-shaped designed, with their curtain facing inside surface is formed. So that the curtain adheres better to the guide elements and so a constriction is counteracted at the curtain edges, it is known from DE-A-197 35 558 Known, the inside of each guide element with a the surface tension influencing auxiliary liquid, for example with water or coating material, to wet.

Aus der WO-A-98/47630 ist eine Vorrichtung der gattungsgemäßen Art zum Auftragen von Dispersionen auf eine Materialbahn bekannt, bei der mit Abstand hinter der Schlitzdüse in jedem Randbereich der Bahn ein Element zum Absaugen von Dispersion angeordnet ist. Es werden in der Höhe und quer zur Bahnlaufrichtung positionierbare Saugdüsen eingesetzt, die den Mehrauftrag an den beiden Bahnrändern absaugen. Der Mehrauftrag an Beschichtungsmaterial wird dadurch verursacht, daß der freifallende Vorhang an seinen Rändern am Ende der Randführungen etwas einschnürt und somit der Auftrag auf die Bahn in diesen Bereichen etwas dicker ist und so ein Randwulst entsteht. Dieser Effekt wird als "Neck in" bezeichnet. Der Mehrauftrag an den Rändern führt zu unerwünschten Profilschwankungen der beschichteten Bahn und kann zu Problemen in einem nachfolgenden Trockner oder beim Aufrollen der beschichteten Bahn führen.From WO-A-98/47630 is a device of the generic type for application of dispersions on a material web, at a distance behind the Slot nozzle in each edge region of the web an element for suction of dispersion is arranged. It will be in the height and across the web direction positionable suction nozzles used, which the additional order at the two web edges aspirate. The additional application of coating material is caused by that the free-falling curtain something at its edges at the end of the edge guides constricts and thus the order on the web in these areas is slightly thicker and such a marginal bulge arises. This effect is called neck in. The additional order at the edges leads to undesirable profile fluctuations of the coated Web and can cause problems in a subsequent dryer or when rolling up lead the coated web.

Ein weiteres Verfahren zur Vorhangbeschichtung eines bewegten Trägers mit Emulsionen ist aus der EP-A-0 841 589 bekannt. Hierbei wird die Emulsion oberhalb der Gießerlippe durch Seitenbegrenzungsplatten derart geführt, dass deren beiden Ränder unter der Einwirkung der Oberflächenspannung an den Seiten der Seitenbegrenzungsplatten nicht steigen. Um eine gleichmäßige Beschichtung ohne Schichtdikkenfehler zu erzeugen, weist die begrenzende Kante der Seitenbegrenzungsplatten eine Schneide auf, dessen beiden Schenkeln einen Winkel von vorzugsweise 60° einschließen.Another method for curtain coating a moving carrier with Emulsions are known from EP-A-0 841 589. Here, the emulsion above the casting lip guided by side boundary plates such that the two Edges under the action of surface tension on the sides of the side boundary plates do not climb. For a uniform coating without Schichtdikkenfehler to produce, has the limiting edge of the side boundary plates a cutting edge, the two legs of an angle of preferably 60 ° lock in.

Ein weiteres Verfahren zum gleichmäßigen und turbulenzlosen Beschichten von Materialbahnen ist aus der US-A-6,048,582 bekannt. Der in dem beschriebenen Verfahren ebenfalls freifallende Vorhang des Beschichtungsmaterials wird seitlich mittels eines weiteren Fluids geführt, wobei das führende Fluid die gleiche Geschwindigkeit aufweist wie das Beschichtungsmaterial. Um Turbulenzen zu unterdrücken und auch im Randbereich eine gleichmäßige Materialdicke auf dem Beschichtungsmaterial zu erzeugen wird das überschüssige Beschichtungsmaterial vom Rand abgesaugt.Another method for uniform and turbuleless coating of Material webs is known from US-A-6,048,582. The described in the Method also free-falling curtain of the coating material becomes laterally guided by another fluid, wherein the leading fluid the same speed has as the coating material. To suppress turbulence and even in the edge region, a uniform material thickness on the coating material To generate the excess coating material is sucked from the edge.

Darstellung der ErfindungPresentation of the invention

Der Erfindung liegt die Aufgabe zugrunde, eine Beschichtungsvorrichtung der gattungsgemäßen Art so zu verbessern, daß bei konstruktiv vereinfachter Bauweise ein gleichmäßiger Auftrag von Beschichtungsmaterial über die gesamte Bahnbreite mit geraden und scharfen Beschichtungskanten möglich ist.The invention is based on the object, a coating device of generic type to improve so that with structurally simplified design a uniform application of coating material over the entire web width with straight and sharp coating edges is possible.

Diese Aufgabe wird dadurch gelöst, dass die dem Vorhang zugewandte Innenseite des Absaugelementes mit der Innenseite des Führungselementes fluchtet und dass der Absaugkanal unten mit einem dünnen Boden verschlossen ist, der im Absaugschlitz mit einer scharfen Kante endet. This object is achieved in that the inside of the suction element facing the curtain is aligned with the inside of the guide element and that the suction channel is closed at the bottom with a thin bottom, which ends in the suction slot with a sharp edge.

Die Gestaltung des Absaugelementes gewährleistet zum einen einen störungsfreien, exakt geführten Ablauf jedes Vorhangrandes bis unmittelbar vor die Bahn, zum anderen wird der Mehrauftrag an den Rändern horizontal nach außen abgesaugt und so der sogenannte "Neck in"-Effekt verhindert. Es entsteht ein scharfer gerader Rand der Beschichtung auf der Bahn.The design of the suction ensures on the one hand a trouble-free, exact run of each curtain edge right up to the web, to others, the additional order at the edges is sucked horizontally to the outside and so the so-called "neck in" effect prevented. The result is a sharp straight edge the coating on the web.

Die Unteransprüche enthalten bevorzugte, da besonders vorteilhafte Ausführungsformen einer erfindungsgemäßen Vorrichtung. The subclaims contain preferred, as particularly advantageous embodiments a device according to the invention.

Kurze Beschreibung der ZeichnungShort description of the drawing

Figur 1FIG. 1
zeigt den Randbereich der Beschichtungsvorrichtung als Querschnitt durch den Vorhang,shows the edge region of the coating device as a cross section through the curtain,
Figur 2FIG. 2
zeigt eine Seitenansicht der Vorrichtung nach Figur 1 undshows a side view of the device of Figure 1 and
Figur 3FIG. 3
eine Draufsicht von oben auf das Absaugeelement.a top view of the suction element.
Wege zur Ausführung der ErfindungWays to carry out the invention

Die in den Figuren dargestellte Beschichtungsvorrichtung dient zum Auftragen eines Dispersionshaftklebstoffes (z. B. eines Acrylats) in wässriger Lösung auf eine silikonisierte Papierbahn. Aufgrund ihrer vorteilhaften Eigenschaften läßt sich die Vorrichtung auch zum Auftragen anderer Dispersionen auf Papierbahnen oder Metall- oder Kunststoffolien, sowie zum Beschichten von Papier- oder Kartonbahnen mit Streichfarbe einsetzen.The coating device shown in the figures is used for applying a Dispersion adhesive (eg an acrylate) in aqueous solution to a siliconized paper web. Due to their advantageous properties, the Device also for applying other dispersions to paper webs or metal or plastic films, as well as for coating paper or board webs with Insert coating color.

Die Vorrichtung enthält eine Schlitzdüse 1, die oberhalb des Laufs der zu beschichtenden Bahn im Gestell der Vorrichtung aufgehängt ist. Die Schlitzdüse 1 ist an eine Zufuhr für Beschichtungsmaterial angeschlossen und weist an ihrer Unterseite einen sich über die Beschichtungsbreite erstreckenden Austrittsspalt 3 auf, aus dem das Beschichtungsmaterial austritt und einen freifallenden Vorhang bildet, der auf die Bahnoberfläche fällt.The device includes a slot nozzle 1, which is above the barrel of the coated Web is suspended in the frame of the device. The slot 1 is connected to a Feeder for coating material connected and has at its bottom one over the coating width extending exit gap 3, from which the Coating emerges and forms a free-falling curtain, which on the Railway surface drops.

An jeder Seite der Schlitzdüse 1 ist unmittelbar neben dem Austrittspalt 3 ein leistenförmiges Führungselement 2 befestigt, das sich nach unten bis in die Nähe der Bahn erstreckt. Jedes Führungselement 2 weist eine dem Vorhang zugewandte Innenseite auf, die mit einer beeinflussenden Hilfsflüssigkeit, beispielsweise mit Wasser oder Beschichtungsmaterial, gespült werden kann. Dazu weist jedes Führungselement 2 oberhalb des Austrittsspalts 3 der Schlitzdüse 1 eine Durchgangsbohrung 4 auf, die an eine Zufuhrleitung 5 angeschlossen ist, über die die Hilfsflüssigkeit zugeführt wird. Innen mündet die Durchgangsbohrung 4 in einen oberhalb des Austrittsspalts 3 senkrecht nach unten verlaufenden Kanal 14, dessen Austrittsöffnung sich in Höhe des Austrittsspalts 3 unmittelbar neben diesem befindet. Der Zufuhrkanal 14 wird konstruktiv einfach so realisiert, daß auf der Außenfläche der Seitenwand der Schlitzdüse 1 eine senkrechte Längsnut gebildet ist, die beim Befestigen des Führungselementes 2 an der Seitenwand abgedichtet wird.On each side of the slit nozzle 1 is immediately adjacent to the exit slit 3 a fixed strip-shaped guide element 2, which extends down to near the Railway extends. Each guide element 2 has a curtain facing Inside on, with an influential auxiliary fluid, for example, with Water or coating material can be rinsed. Everybody points this out Guide element 2 above the outlet gap 3 of the slot 1 a through hole 4, which is connected to a supply line 5, via which the auxiliary liquid is supplied. Inside, the through hole 4 opens into a above the Exit slit 3 vertically downwardly extending channel 14, the outlet opening is located at the level of the exit gap 3 immediately adjacent to this. The feed channel 14 is structurally simply realized so that on the outer surface of the side wall of Slot nozzle 1 is a vertical longitudinal groove formed when attaching the Guide element 2 is sealed to the side wall.

Bevorzugt ist jedes Führungselement 2 in Form einer Leiste gestaltet und weist eine Dicke von 0,1 mm - 3 mm und eine Breite von ca. 10 bis 20 mm auf. Die Länge des Führungselementes 2 wird der Höhe des Vorhanges angepaßt, also dem Abstand des Austrittsspalts von der zu beschichtenden Bahn. Im vorliegenden Ausführungsbeispiel beträgt die Fallhöhe des Vorhanges und somit die sich nach unten erstreckende freie Länge jedes Führungselementes 2 zwischen 50 mm und 250 mm.Preferably, each guide element 2 is designed in the form of a strip and has a Thickness of 0.1 mm - 3 mm and a width of about 10 to 20 mm. The length of the Guide element 2 is adapted to the height of the curtain, ie the distance of the Exit slit of the web to be coated. In the present embodiment is the drop height of the curtain and thus the downwardly extending free Length of each guide element 2 between 50 mm and 250 mm.

Wesentlich für die Erfindung ist, daß am unteren Ende jedes Führungselementes 2 ein Absaugeelement 6 befestigt ist, dessen dem Vorhang zugewandte Innenseite mit der Innenseite des Führungselementes 2 fluchtet. Der an dem Führungselement 2 und anschließend an dem Absaugeelement 6 herabfließende Vorhangrand wird so auf seinem Weg zu der Bahn nicht gestört. Durch das Absaugeelement 6 führt von außen nach innen ein Absaugkanal 7, der an eine Saugleitung 8 angeschlossen ist. Der Absaugkanal 7 ist am unteren Ende des Absaugeelementes 6 angeordnet und mündet in einen Absaugeschlitz 9, der am unteren Ende der Innenseite des Absaugeelementes 6 senkrecht zum Vorhang verläuft. Die in Bahnlaufrichtung gemessene Länge des Absaugschlitzes 9 beträgt 0,5 mm bis 15 mm, bevorzugt 5 mm bis 12 mm, damit die Absaugfunktion bei entsprechenden Schwankungen des Vorhangs gewährleistet bleibt. Seine Höhe beträgt 0,1 mm bis 2 mm, bevorzugt 0,5 mm bis 1 mm. Er ist an der Unterseite des Absaugeelementes 6 so angeordnet, daß sein Abstand von der Bahn 0, 1 mm bis 3 mm beträgt. Damit dieser geringe Abstand eingehalten werden kann, ist der Absaugkanal 7 unten mit einem dünnen, nur geringfügig gegen die Bahn geneigten Boden 10 verschlossen, der im Absaugschlitz 9 mit einer scharfen Kante endet. Die Absaugung des verdickten Randes des Beschichtungsmaterials erfolgt so im wesentlichen in einer horizontalen Richtung. Dies hat den Vorteil, daß die dem Absaugen entgegenwirkenden Kräfte minimal sind und zugleich der Rand beim Absaugen nicht verschmiert wird. Die weitere horizontale Führung ohne Toträume des Absaugkanals 7 wirkt Ablagerungen von abgesaugtem Beschichtungsmaterial entgegen.Essential for the invention is that at the lower end of each guide element 2 a Absaugeelement 6 is fixed, the curtain facing the inside with the Inside the guide element 2 is aligned. The on the guide element 2 and The curtain edge flowing down on the suction element 6 then becomes so not disturbed his way to the train. Through the suction element 6 leads from the outside inside a suction 7, which is connected to a suction line 8. Of the Suction channel 7 is arranged at the lower end of the suction element 6 and opens in a suction slot 9, at the lower end of the inside of the suction element 6 runs perpendicular to the curtain. The length measured in the web running direction Suction slot 9 is 0.5 mm to 15 mm, preferably 5 mm to 12 mm, so that the Extraction function ensured with appropriate variations of the curtain remains. Its height is 0.1 mm to 2 mm, preferably 0.5 mm to 1 mm. He is at the Bottom of the suction element 6 is arranged so that its distance from the web 0, 1 mm to 3 mm. So that this small distance can be maintained is the suction channel 7 below with a thin, only slightly against the web inclined bottom 10 closed in the suction slot 9 with a sharp edge ends. The suction of the thickened edge of the coating material takes place in this way essentially in a horizontal direction. This has the advantage that the the Suction counteracting forces are minimal and at the same time the edge at Suction is not smeared. The further horizontal guidance without dead spaces of the Suction channel 7 acts deposits of aspirated coating material opposite.

Um Anbackungen oder Ablagerungen im Absaugeschlitz 9 und dem Absaugkanal 7 zu verhindern, werden diese zusätzlich mit einer geeigneten Spülflüssigkeit, beispielsweise mit Wasser, gespült. Dazu führen zwei Spülleitungen 11 parallel zu der Absaugleitung 8 zu dem Absaugschlitz 9, die mit geringem Abstand vor diesen in den Absaugkanal 7 münden. Die Spülflüssigkeit wird gemeinsam mit dem abgesaugten Beschichtungsmaterial über die Absaugleitung 8 weggeführt. Die Absaugleitung 8 ist dazu an eine Pumpe angeschlossen.To caking or deposits in the suction slot 9 and the suction 7 too prevent these are additionally with a suitable rinsing liquid, for example with water, rinsed. For this purpose, two flushing lines 11 lead parallel to the Suction 8 to the suction slot 9, which in front of these in the Suction channel 7 open. The rinsing liquid is sucked together with the Coating material led away via the suction line 8. The suction line 8 is connected to a pump.

Damit der auf die Bahn auftreffende Rand des Vorhangs quer zur Bahnlaufrichtung begrenzt eingestellt werden kann, sind die beiden Führungselemente 2 aus einem begrenzt flexiblem, elastisch biegbaren Material gefertigt, bevorzugt aus Federstahl. Zur Abstützung und Verstellung jedes Führungselementes 2 erstreckt sich außen mit geringem Abstand eine Stützleiste 12 parallel zum Führungselement 2 nach unten, die ebenfalls an der Seitenwand der Schlitzdüse 1 befestigt ist. Die Stützleiste 12 ist aus einem steifen Material, beispielsweise aus ausreichend dickem Stahl gefertigt und endet mit geringem Abstand vor dem Absaugeelement 6. Im unteren Bereich der Stützleiste 12 ist ein von außen gegen das Führungselement 2 bewegbares Verstellelement gelagert, im Beispiel eine Verstellschraube 13. Mittels der Verstellschraube 13 läßt sich das freie Ende des Führungsselementes 2 mit dem daran befestigten Absaugelement 6 begrenzt quer zur Bahnlaufrichtung verstellen, um die Position des Absaugeschlitzes 9 exakt einstellen zu können. Zusätzlich läßt sich mit dem Verstellelement auch der Verlauf des Führungselementes 2 begrenzt variieren, um die Führung und Haltung des Vorhangrandes optimal einzustellen.Thus, the impact on the web edge of the curtain transverse to the web running direction can be set limited, the two guide elements 2 are made of a made limited flexible, elastically bendable material, preferably made of spring steel. For supporting and adjusting each guide element 2 extends outside with small distance a support bar 12 parallel to the guide member 2 down, the is also attached to the side wall of the slit nozzle 1. The support bar 12 is made a stiff material, for example made of sufficiently thick steel and ends at a small distance in front of the suction element 6. In the lower part of the Support strip 12 is a movable from the outside against the guide element 2 adjustment stored, in the example an adjusting screw 13. By means of the adjusting screw 13th can be the free end of the guide element 2 with the attached thereto Absaugelement 6 limited adjust transversely to the web running direction to the position of the Exhaust slot 9 can be set exactly. In addition, can be with the Adjustment also the course of the guide element 2 limited vary to the Adjust the guidance and posture of the curtain edge optimally.

Claims (7)

  1. Device for coating a moving material web, comprising a slot nozzle (1), from which the coating material emerges in a free-falling curtain and which, on each side, immediately beside the outlet gap (3) has a guide element (2) extending downwards for the edge of the curtain, and having an extraction element (6) arranged in the edge region of the web in order to extract coating material, which element is fixed at the lower end of each guide element (2) and which guides an extraction duct (7), which is connected to a suction line (8) and opens into an extraction slot (9) which extends on the lower end of the inner side of the extraction element (6), perpendicular to the plane of the curtain, characterized in that the inner side of the extraction element (6), facing the curtain, is aligned with the inner side of the guide element, and in that the extraction duct (7) is closed at the bottom by a thin base (10) which ends with a sharp edge in the extraction slot (9).
  2. Device according to Claim 1, characterized in that the extraction slot (9) is arranged at the lower end of the extraction element (6) at a distance of 0.1 mm to 3 mm from the web and has a length in the web running direction of 0.5 mm to 15 mm, preferably 5 mm to 12 mm.
  3. Device according to Claim 1 or 2, characterized in that the height of the extraction slot (9) is 0.1 mm to 2 mm, preferably 0.5 mm to 1 mm.
  4. Device according to one of Claims 1 to 3, characterized in that at least one line (11) for the supply of washing liquid opens into the extraction duct (7).
  5. Device according to one of Claims 1 to 4, characterized in that the base of the extraction duct (7) is inclined only slightly with respect to the web.
  6. Device according to one of Claims 1 to 5, characterized in that each guide element (2) is configured in the form of a strip and is fabricated from a material which can be bent elastically but has limited flexibility, in particular of spring steel.
  7. Device according to Claim 6, characterized in that the free end of the guide element (2) with the extraction element (6) fixed thereto can be displaced transversely with respect to the web running direction by means of a displacement element.
EP02730107A 2001-04-09 2002-04-05 Device for coating a moving material web Expired - Lifetime EP1377391B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10117668A DE10117668A1 (en) 2001-04-09 2001-04-09 Device for coating a running material web
DE10117668 2001-04-09
PCT/EP2002/003776 WO2002081103A1 (en) 2001-04-09 2002-04-05 Device for coating a moving material web

Publications (2)

Publication Number Publication Date
EP1377391A1 EP1377391A1 (en) 2004-01-07
EP1377391B1 true EP1377391B1 (en) 2005-06-08

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP02730107A Expired - Lifetime EP1377391B1 (en) 2001-04-09 2002-04-05 Device for coating a moving material web

Country Status (4)

Country Link
US (1) US7081163B2 (en)
EP (1) EP1377391B1 (en)
DE (2) DE10117668A1 (en)
WO (1) WO2002081103A1 (en)

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Also Published As

Publication number Publication date
US7081163B2 (en) 2006-07-25
EP1377391A1 (en) 2004-01-07
DE50203346D1 (en) 2005-07-14
DE10117668A1 (en) 2002-10-10
WO2002081103A1 (en) 2002-10-17
US20050126479A1 (en) 2005-06-16

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