EP1239974B1 - Device for coating a running material web - Google Patents

Device for coating a running material web Download PDF

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Publication number
EP1239974B1
EP1239974B1 EP00985009A EP00985009A EP1239974B1 EP 1239974 B1 EP1239974 B1 EP 1239974B1 EP 00985009 A EP00985009 A EP 00985009A EP 00985009 A EP00985009 A EP 00985009A EP 1239974 B1 EP1239974 B1 EP 1239974B1
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EP
European Patent Office
Prior art keywords
coating
web
curtain
channel
dividing element
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP00985009A
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German (de)
French (fr)
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EP1239974A1 (en
Inventor
Bruno Holtmann
José Antonio MENA
Rolf Metzger
Luca Frediani
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Bachofen and Meier AG Maschinenfabrik
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Bachofen and Meier AG Maschinenfabrik
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Publication of EP1239974A1 publication Critical patent/EP1239974A1/en
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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
    • Y—GENERAL 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S118/00—Coating apparatus
    • Y10S118/04—Curtain coater

Definitions

  • the invention relates to a device for coating a moving web of material, in which the coating material is applied to the web in a free-falling curtain and with separating elements for separating the edges of the curtain to the desired coating width, wherein on each side of the curtain at least one separating element is present and that on the outer side of the separating element, which determines the coating width of the material web, a channel is provided, from which the collected coating material is discharged in or against the web running direction.
  • curtain coater For coating of moving webs such as paper or board webs, plastic or metal foils so-called curtain coater are known in which the coating material (pigment coating, plastic dispersions, etc.) is applied from a slot in a free-falling curtain on the web.
  • coating material pigment coating, plastic dispersions, etc.
  • it is known from US Pat WO 98/47630 and the DE 19735588-A
  • the curtain edges are separated before the impact of the curtain on the material web by means of separating elements, which are arranged transversely to the web running direction adjustable below the guide elements.
  • the two separating elements each have an upwardly projecting separating edge and an outwardly inclined upper collecting surface on which the material separated from the separating edge of the curtain edge is discharged to the outside.
  • the JP-A-61035880 describes a method in which the width of the curtain is limited by means of two laterally arranged next to the coating curtain collecting container.
  • the collecting containers are received via guides perpendicular to the curtain or laterally displaceable.
  • the curtain coater When the curtain coater is used for applying dispersion adhesives to a sheet-like separator in the production of self-adhesive labels, adhesive film strips, etc., or for applying a barrier layer in the production of a moistureproof packaging material, it is necessary to be able to adjust the coating width differently over a wide range because the web width of the material webs to be coated varies considerably.
  • the invention is therefore based on the object to improve a method and an apparatus of the generic type so that very different coating widths can be adjusted without affecting the coating quality.
  • This object is achieved in that an inner surface of the separating element, which determines the coating width of the material web, is rinsed with an auxiliary liquid.
  • inner separating elements can be used whose separating edge has only a small height.
  • the main part of the stream of coating material to be separated is separated from the first outer separating elements, whose separating edges extend sufficiently high to avoid overflowing of the separated coating material.
  • the inner separating elements only the remainder of the curtain edge is separated. You can do it have a low height, without that separated coating material undesirably drains inwards over the separating edge.
  • a small height of the separating edge of the inner elements is advantageous, since their running parallel to the flow direction of the curtain inner surface also serves as a guide element for the curtain edge. Too high a height will cause the curtain edge to detach too far above the web to be coated from the inside surface. Then its position fluctuates and a bead forms on the coating material which is applied to the web.
  • the coating apparatus shown in the figures serves to apply a dispersion adhesive (for example an acrylate) in aqueous solution to a siliconized paper web 1. Because of its advantageous properties, the device can also be used for applying other dispersions to paper, plastic films or thin strips or to Coat paper or board webs with coating color.
  • a dispersion adhesive for example an acrylate
  • the slot nozzle 2 contains a slot nozzle 2, which is suspended above the path of the web 1 in the frame of the applicator.
  • the slot nozzle 2 is connected to a supply for coating material, not shown, and has on its underside a slot-shaped opening from which emerges the coating material and a forms a free-falling curtain 3, which falls on the web surface.
  • the width of the slot of the nozzle 2 is greater than the maximum width of the web.
  • the web 1 is supported over its entire width by a support roller 4.
  • the support roller 4 is fed to the uncoated web 1 from below. After coating, the web 1 leaves the support roller 4 approximately in the horizontal direction.
  • the slot nozzle 2 is suspended vertically adjustable above the apex line of the support roller 4 in order to adjust the distance of the Auslrawschlitzes of the web 1 and thus the drop height of the coating material can.
  • the slit nozzle 2 is mounted horizontally in and against the web running direction, so that it can be moved against the web running direction from the region above the apex line of the support roller 4 to a region in front of the support roller 4.
  • the slot nozzle 2 is then above a drip pan 5, which is located immediately in front of the support roller 4 above the web 1. In this position, a stable curtain 3 is initially generated when starting the coating device, which falls into the drip pan 5. Subsequently, the slot nozzle 2 is moved with its attached elements in the web running direction - in Fig.
  • strip-shaped guide elements 8 extending down to the vicinity of the web 1 are attached to both sides of the slot nozzle 2.
  • the two guide elements 8 are each attached directly adjacent to the outlet slit of the slit nozzle 2, and their curtain 3 facing the inside is formed flat.
  • the inside of each guide member 8 can be flushed with a surface tension reducing auxiliary liquid, for example with water.
  • the auxiliary liquid flowing downwards from the top to the bottom on the guide elements 8 causes the curtain 3 adheres better to the guide elements 8.
  • the guide elements 8 can be designed inclined inwards.
  • means for limiting the curtain 3 to the desired coating width are arranged below the guide elements 8.
  • the limiting means are respectively fixed to the frame of the nozzle 2, so that they are moved in a displacement of the nozzle 2 in or against the web running direction.
  • they are mounted displaceably transversely to the web running direction in order to adjust the width of falling on the web 1 curtain 3 to greatly different web widths can.
  • the edge limiting means of both sides are mirror images of each other and arranged. They can be adjusted transversely apart.
  • the edge limiting means each consist of two blade-shaped, substantially perpendicular and with a certain distance from each other arranged separating elements 9, 10, which are fixed to the longitudinal sides of a bottom plate 11. Both separating elements 9, 10 run in a sharp separation edge, wherein the height of the separating edge of the inner separating element 9 is chosen so small that the curtain 3 does not detach from the inner surface 12 before it impinges on the web 1.
  • the inner separating element 9 forms, together with the outer separating element 10 and the bottom plate 11, a marginal channel 13 which discharges the coating material collected between the two separating elements 9, 10.
  • the separating elements 9, 10 are extended against the web running direction to form the groove 13 so far that their end extends into the region of the guide plate 6.
  • the bottom plate 11 is inclined downwards so that the collected coating material runs in the direction of the sump 5.
  • each transverse channel 14 is attached to catch the outer edge of the curtain.
  • the measured transversely to the web running direction length of each transverse groove 14 is selected so that when setting a minimum coating width their outer end to below the associated guide element 8, that extends beyond the lateral end of the outlet slot of the nozzle 2.
  • Each transverse channel 14 has side walls 15, which extend in height up to the separating edge of the associated separating element 10.
  • the partition 10 forms the inner boundary wall of the channel 14. Its height is sufficiently large, so that the separated Volumetric flow of coating material can be collected and removed with minimal coating width, without overflowing coating material.
  • the transverse grooves 14 each extend inwardly inclined, and at its inner end in the region of the separating element 10 in each case a drainage channel 16 is attached.
  • a drainage channel 16 Via the gutter 16, which also extends against the web running direction into the area above the baffle 6, the collected coating material is discharged into the drip pan 5.
  • An inwardly inclined transverse channel 14 with a next to the separator 10 arranged gutter 16 has two advantages: Firstly, the drip tray 5 only needs to extend over the axial length of the support roller 4, since even at maximum coating width, the gutter 16 is still in the area Counter roll is located. On the other hand, the outer end of the transverse channel 14 does not collide with the support roller 4, when the separating blades 9, 10 are moved with the transverse groove 14 for setting a minimum coating width very far inward, as shown in phantom in Fig. 4.
  • the two separating elements 9, 10 adjusted with the attached transverse groove 14 so far inwardly adjusted that the inner separating knife 9 is arranged in the region of the desired coating edge.
  • the outer separator 10 of greater height separates the outer part of the curtain edge, which is collected by the transverse channel 14 and passed through the gutter 16 into the drip pan 5.
  • the result is a narrow, inner curtain 3, the edges of which are then separated from the inner separating elements 9 and derived via the edge troughs 13.
  • the inner surface 12 of each partition member 9 serves as a guide for the edge of the curtain part, which is applied to the web 1.
  • the small height of the separating element 9 ensures that the curtain edges do not become detached from the web 1 before impact.
  • a suction line 17 is arranged on the underside of each edge channel 13, which opens via a suction channel 18 in the bottom plate 11 in a suction slot 19 in the inner side 12 of the inner separating element 9.
  • the suction slot 19 extends at a distance of 0.1 mm - 1 mm from the web 1 at the bottom of the separating element 9 in the curtain 3. In the web running direction, it has a length of 2 mm - 15 mm, preferably 3 mm - 5mm so that the Absaugugsfunktion guaranteed with appropriate variations of the curtain 3.
  • the suction line 17 extends outwardly below the transverse channel 14 and is connected to a pump with a separator for the coating material.
  • the length of the suction channel 18 in the bottom plate 11 is determined by the distance between the two separating elements 9, 10 from each other. It should be kept as low as possible, so that no excessive pressure losses occur and caking in the suction channel 18 can be avoided.
  • a short suction channel 18 is made possible by a narrow-shaped edge channel 13, which only has to dissipate a small stream of separated coating material.
  • the auxiliary liquid is supplied so that it exits at the separating edge of the separating element 9 and flows down on both sides of the separating element 9.
  • the exiting auxiliary liquid thus forms a liquid cushion immediately above the separating edge of the separating element 9, which prevents caking of coating material at the separating edge.
  • the separating element 9 is constructed in two parts: on the bottom plate 11 a expiring in a sharp edge side wall 21 is fixed, in the upper part outside a vertical groove 22 is incorporated. Externally on the wall 21, a thin, blade-shaped cover plate 23 is attached, which covers the groove 22 and thus forms an open at the separating edge slot-shaped channel. A water supply 24 opens into the channel.
  • the water supplied by means of the water supply 24 exits at the top in the region of the separating edge and runs down both on the inner surface 12 of the sheet 21 as auxiliary liquid stabilizing the curtain 3 and along the wall 21 into the edge channel 13 ,
  • the entire separating element 9 is thus lapped by water, so that even with coating materials prone to sticking the adhesion of material to the 9 is prevented.

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  • Coating Apparatus (AREA)
  • Paper (AREA)
  • Reverberation, Karaoke And Other Acoustics (AREA)

Abstract

The aim of the invention is to coat running material webs (1). According to prior art, the coating material is applied to the material web (1) by means of curtain coaters. Said coating material is discharged from a slit nozzle (2) and passes through a free-falling curtain (3). The edges of the curtain (3) are separated by means of separating elements (9, 10) before the fall into the material web (1) for adjusting the coating width. According to the invention, a smaller curtain is produced on each edge by means of a first outer separating element (10). Said curtain is adjusted to the desired coating width by means of a second, inner separating element (9). In a preferred embodiment, an inner separating element (9) is used which contains a vertical channel in the interior thereof. Said channel is open on the separating edge. A water supply (24) flows into said channel.

Description

Technisches GebietTechnical area

Die Erfindung betrifft eine Vorrichtung zum Beschichten einer laufenden Materialbahn, bei dem das Beschichtungsmaterial in einem freifallenden Vorhang auf die Bahn aufgetragen wird und mit Trennelementen zur Abtrennung der Ränder des Vorhanges bis auf die gewünschte Beschichtungsbreite, wobei an jeder Seite des Vorhanges mindestens ein Trennelement vorhanden ist und daß an der Außenseite des Trennelementes, das die Beschichtungsbreite der Materialbahn bestimmt, eine Rinne vorhanden ist, von der das aufgefangene Beschichtungsmaterial in oder gegen Bahnlaufrichtung abgeführt wird.The invention relates to a device for coating a moving web of material, in which the coating material is applied to the web in a free-falling curtain and with separating elements for separating the edges of the curtain to the desired coating width, wherein on each side of the curtain at least one separating element is present and that on the outer side of the separating element, which determines the coating width of the material web, a channel is provided, from which the collected coating material is discharged in or against the web running direction.

Stand der TechnikState of the art

Zum Beschichten von laufenden Materialbahnen wie Papier- oder Kartonbahnen, Kunststoff- oder Metallfolien sind sogenannte Curtain-Coater bekannt, bei denen das Beschichtungsmaterial (Pigmentstreichfarbe, Kunststoffdispersionen etc.) aus einer Schlitzdüse in einem freifallenden Vorhang auf die Materialbahn aufgetragen wird. Um eine stabilen und über die Beschichtungsbreite gleichmäßigen Vorhang zu erzeugen, ist es aus der WO 98/47630 und der DE 19735588-A bekannt, die beiden Vorhangränder jeweils mit einem sich von der Schlitzdüse nach unten bis in die Nähe der Materialbahn erstreckenden Führungselement zu führen. Zur Einstellung der gewünschten Beschichtungsbreite werden die Vorhangränder vor dem Aufprall des Vorhangs auf die Materialbahn mittels Trennelementen abgetrennt, die quer zur Bahnlaufrichtung verstellbar unterhalb der Führungselemente angeordnet sind. Die beiden Trennelemente weisen jeweils eine nach oben ragende Trennkante und eine nach außen geneigte obere Auffangfläche auf, auf der das von der Trennkante abgetrennte Material des Vorhangrandes nach außen abgeleitet wird.For coating of moving webs such as paper or board webs, plastic or metal foils so-called curtain coater are known in which the coating material (pigment coating, plastic dispersions, etc.) is applied from a slot in a free-falling curtain on the web. In order to produce a stable curtain which is uniform over the coating width, it is known from US Pat WO 98/47630 and the DE 19735588-A It is known to guide the two curtain edges in each case with a guide element extending from the slot nozzle down to the vicinity of the material web. To set the desired coating width, the curtain edges are separated before the impact of the curtain on the material web by means of separating elements, which are arranged transversely to the web running direction adjustable below the guide elements. The two separating elements each have an upwardly projecting separating edge and an outwardly inclined upper collecting surface on which the material separated from the separating edge of the curtain edge is discharged to the outside.

Um die Möglichkeit zu haben, die Breite eines Beschichtungsvorhanges in der Breite zu verändern, wird in der JP A-61035880 ein Verfahren beschrieben, bei dem mittels zweier seitlich neben dem Beschichtungsvorhang angeordneter Auffangbehälter die Breite des Vorhanges begrenzt wird. Um die Beschichtungsbreite individuell und stufenlos einstellen zu können, sind die Auffangbehälter über Führungen senkrecht zum Vorhang bzw. seitlich verschiebbar aufgenommen.In order to have the possibility to change the width of a coating curtain in width, in the JP-A-61035880 describes a method in which the width of the curtain is limited by means of two laterally arranged next to the coating curtain collecting container. In order to be able to adjust the coating width individually and steplessly, the collecting containers are received via guides perpendicular to the curtain or laterally displaceable.

Wird der Curtain-Coater zum Auftragen von Dispersionshaftklebstoffen auf ein bahnförmiges Trennelement bei der Herstellung von selbstklebenden Etiketten, Haftfolienstreifen etc. oder zum Auftragen einer Barriereschicht bei der Herstellung eines feuchtigkeitsundurchlässigen Verpackungsmaterials benutzt, ist es erforderlich, die Beschichtungsbreite über einen großen Bereich unterschiedlich einstellen zu können, da die Bahnbreite der zu beschichtenden Materialbahnen erheblich variiert.When the curtain coater is used for applying dispersion adhesives to a sheet-like separator in the production of self-adhesive labels, adhesive film strips, etc., or for applying a barrier layer in the production of a moistureproof packaging material, it is necessary to be able to adjust the coating width differently over a wide range because the web width of the material webs to be coated varies considerably.

Darstellung der ErfindungPresentation of the invention

Der Erfindung liegt daher die Aufgabe zu Grunde, ein Verfahren und eine Vorrichtung der gattungsgemäßen Art so zu verbessern, daß stark unterschiedliche Beschichtungsbreiten ohne Beeinträchtigung der Beschichtungsqualität eingestellt werden können.The invention is therefore based on the object to improve a method and an apparatus of the generic type so that very different coating widths can be adjusted without affecting the coating quality.

Diese Aufgabe wird dadurch gelöst, daß eine Innenfläche des Trennelementes, das die Beschichtungsbreite der Materialbahn bestimmt, mit einer Hilfsflüssigkeit bespült wird. This object is achieved in that an inner surface of the separating element, which determines the coating width of the material web, is rinsed with an auxiliary liquid.

Die Anordnung von zwei Trennelementen an jeder Seite ermöglicht es, zur Einstellung einer sehr geringen Beschichtungsbreite große seitliche Bereiche des Vorhangs abzutrennen, ohne daß Beschichtungsfehler an den Längsrändern auftreten. Zur Vermeidung von Beschichtungsfehlern (Schwankungen des Auftragsgewichts oder der Beschichtungsbreite, Vorhangabriß etc.) können innere Trennelemente eingesetzt werden, deren Trennkante nur eine geringe Höhe aufweist. Der Hauptteil des abzutrennenden Stroms an Beschichtungsmaterial wird von den ersten äußeren Trennelementen abgetrennt, deren Trennkanten ausreichend hoch reichen, um ein Überlaufen des abgetrennten Beschichtungsmaterials zu vermeiden. Mittels der inneren Trennelemente wird nur der Rest des Vorhangrandes abgetrennt. Sie könnendaher eine geringe Höhe aufweisen, ohne daß abgetrenntes Beschichtungsmaterial unerwünschterweise nach innen über die Trennkante abfließt. Eine geringe Höhe der Trennkante der inneren Elemente ist vorteilhaft, da ihre parallel zur Fließrichtung des Vorhanges verlaufende Innenfläche zugleich als Führungselement für den Vorhangrand dient. Eine zu große Höhe führt dazu, daß sich der Vorhangrand zu weit oberhalb der zu beschichtenden Bahn von der Innenfläche löst. Dann schwankt seine Position, und es bildet sich ein Wulst am Beschichtungsmaterial, der auf die Materialbahn aufgetragen wird.The arrangement of two separators on each side makes it possible to cut large lateral areas of the curtain to set a very small coating width, without coating defects occur at the longitudinal edges. In order to avoid coating errors (fluctuations in the coating weight or the coating width, curtain breakage, etc.) inner separating elements can be used whose separating edge has only a small height. The main part of the stream of coating material to be separated is separated from the first outer separating elements, whose separating edges extend sufficiently high to avoid overflowing of the separated coating material. By means of the inner separating elements only the remainder of the curtain edge is separated. You can do it have a low height, without that separated coating material undesirably drains inwards over the separating edge. A small height of the separating edge of the inner elements is advantageous, since their running parallel to the flow direction of the curtain inner surface also serves as a guide element for the curtain edge. Too high a height will cause the curtain edge to detach too far above the web to be coated from the inside surface. Then its position fluctuates and a bead forms on the coating material which is applied to the web.

Kurze Beschreibung der ZeichnungShort description of the drawing

Die Zeichnungen dienen zur Erläuterung der Erfindung anhand vereinfacht dargestellter Ausführungsbeispiele.The drawings serve to explain the invention with reference to simplified examples.

Es zeigen:

Fig.1
einen Längsschnitt durch einen Curtain-Coater nach der Erfindung,
Fig. 2
den Randbereich als Querschnitt durch den Vorhang,
Fig. 3
eine Draufsicht auf den Randbereich,
Fig. 4
in einem Querschnitt die Verstellmöglichkeit der Randbegrenzung,
Fig. 5
einen Längsschnitt durch ein Trennelement,
Fig. 6
die zugehörige Draufsicht und
Fig. 7
den zugehörigen Querschnitt
Show it:
Fig.1
a longitudinal section through a curtain coater according to the invention,
Fig. 2
the edge area as a cross section through the curtain,
Fig. 3
a top view of the edge area,
Fig. 4
in a cross-section the adjustment of the deckle,
Fig. 5
a longitudinal section through a separating element,
Fig. 6
the associated plan view and
Fig. 7
the corresponding cross section

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 1. Aufgrund ihrer vorteilhaften Eigenschaften läßt sich die Vorrichtung auch zum Auftragen anderer Dispersionen auf Papier, Kunststoffolien oder dünne Bänder oder zum Beschichten von Papier- oder Kartonbahnen mit Streichfarbe einsetzen.The coating apparatus shown in the figures serves to apply a dispersion adhesive (for example an acrylate) in aqueous solution to a siliconized paper web 1. Because of its advantageous properties, the device can also be used for applying other dispersions to paper, plastic films or thin strips or to Coat paper or board webs with coating color.

Sie enthält eine Schlitzdüse 2, die oberhalb des Laufs der Bahn 1 im Gestell der Auftragsvorrichtung aufgehängt ist. Die Schlitzdüse 2 ist an eine nicht dargestellte Zufuhr für Beschichtungsmaterial angeschlossen und weist an ihrer Unterseite eine schlitzförmige Öffnung auf, aus der das Beschichtungsmaterial austritt und einen freifallenden Vorhang 3 bildet, der auf die Bahnoberfläche fällt. Die Breite des Schlitzes der Düse 2 ist größer als die maximale Breite der Bahn 1.It contains a slot nozzle 2, which is suspended above the path of the web 1 in the frame of the applicator. The slot nozzle 2 is connected to a supply for coating material, not shown, and has on its underside a slot-shaped opening from which emerges the coating material and a forms a free-falling curtain 3, which falls on the web surface. The width of the slot of the nozzle 2 is greater than the maximum width of the web. 1

Unterhalb der Schlitzdüse 2 wird die Bahn 1 über ihre gesamte Breite von einer Stützwalze 4 abgestützt. Der Stützwalze 4 wird die unbeschichtete Bahn 1 von unten zugeführt. Nach dem Beschichten verläßt die Bahn 1 die Stützwalze 4 etwa in waagerechter Richtung.Below the slot nozzle 2, the web 1 is supported over its entire width by a support roller 4. The support roller 4 is fed to the uncoated web 1 from below. After coating, the web 1 leaves the support roller 4 approximately in the horizontal direction.

Die Schlitzdüse 2 ist oberhalb der Scheitellinie der Stützwalze 4 höhenverstellbar aufgehängt, um den Abstand des Auslaßschlitzes von der Bahn 1 und somit die Fallhöhe des Beschichtungsmaterials einstellen zu können. Zusätzlich ist die Schlitzdüse 2 horizontal in und gegen Bahnlaufrichtung beweglich gelagert, so daß sie gegen Bahnlaufrichtung von dem Bereich oberhalb der Scheitellinie der Stützwalze 4 bis in einen Bereich vor der Stützwalze 4 bewegt werden kann. Die Schlitzdüse 2 steht dann oberhalb einer Auffangwanne 5, die unmittelbar vor der Stützwalze 4 oberhalb der Bahn 1 angeordnet ist. In dieser Position wird beim Start der Beschichtungsvorrichtung zunächst ein stabiler Vorhang 3 erzeugt, der in die Auffangwanne 5 fällt. Anschließend wird die Schlitzdüse 2 mit den an ihr befestigten Elementen in Bahnlaufrichtung - in Fig. 1 nach rechts - in ihrer Arbeitsposition oberhalb der Stützwalze 4 bewegt. Der Bereich zwischen dem auslaufseitigen Ende der Auffangwanne 5 und dem Scheitelbereich der Gegenwalze 4 wird von einem über die Arbeitsbreite reichenden Leitblech 6 abgedeckt. Am Ende des Leitblech 6 ist ein Schaber 7 angeordnet, der die auf der Bahn 1 anhaftende Luftgrenzschicht vor dem Aufprall des Vorhangs 3 verringert.The slot nozzle 2 is suspended vertically adjustable above the apex line of the support roller 4 in order to adjust the distance of the Auslaßschlitzes of the web 1 and thus the drop height of the coating material can. In addition, the slit nozzle 2 is mounted horizontally in and against the web running direction, so that it can be moved against the web running direction from the region above the apex line of the support roller 4 to a region in front of the support roller 4. The slot nozzle 2 is then above a drip pan 5, which is located immediately in front of the support roller 4 above the web 1. In this position, a stable curtain 3 is initially generated when starting the coating device, which falls into the drip pan 5. Subsequently, the slot nozzle 2 is moved with its attached elements in the web running direction - in Fig. 1 to the right - in its working position above the support roller 4. The area between the outlet-side end of the collecting trough 5 and the apex region of the counter-roller 4 is covered by a guide plate 6 extending over the working width. At the end of the guide plate 6, a scraper 7 is arranged, which reduces the adhering to the web 1 air boundary layer before the impact of the curtain 3.

Da der freifallende Vorhang 3 dazu neigt, sich aufgrund der Oberflächenspannung an seinen Rändern einzuschnüren, sind an beiden Seiten der Schlitzdüse 2 sich nach unten bis die Nähe der Bahn 1 erstreckende leistenförmige Führungselemente 8 befestigt. Bevorzugt sind die beiden Führungselemente 8 jeweils unmittelbar neben dem Austrittsspalt der Schlitzdüse 2 befestigt, und ihre dem Vorhang 3 zugewandte Innenseite ist flächig ausgebildet. Wie in der DE 19735558-A beschrieben, kann die Innenseite jedes Führungselements 8 mit einer die Oberflächenspannung reduzierenden Hilfsflüssigkeit gespült werden, beispielsweise mit Wasser. Die von oben nach unten innen auf den Führungselementen 8 herabfließende Hilfsflüssigkeit bewirkt, daß der Vorhang 3 besser an den Führungselementen 8 haftet. Alternativ können die Führungselemente 8 nach innen geneigt gestaltet werden.Since the free-falling curtain 3 tends to constrict at its edges due to the surface tension, strip-shaped guide elements 8 extending down to the vicinity of the web 1 are attached to both sides of the slot nozzle 2. Preferably, the two guide elements 8 are each attached directly adjacent to the outlet slit of the slit nozzle 2, and their curtain 3 facing the inside is formed flat. Like in the DE 19735558-A described, the inside of each guide member 8 can be flushed with a surface tension reducing auxiliary liquid, for example with water. The auxiliary liquid flowing downwards from the top to the bottom on the guide elements 8 causes the curtain 3 adheres better to the guide elements 8. Alternatively, the guide elements 8 can be designed inclined inwards.

An beiden Längsseiten der Beschichtungsvorrichtung sind unterhalb der Führungselemente 8 Mittel zur Begrenzung des Vorhangs 3 auf die gewünschte Beschichtungsbreite angeordnet. Die Begrenzungsmittel sind jeweils am Gestell der Düse 2 befestigt, so daß sie bei einer Verschiebung der Düse 2 in oder gegen Bahnlaufrichtung mitbewegt werden. Zusätzlich sind sie quer zur Bahnlaufrichtung verschiebbar gelagert, um die Breite des auf die Bahn 1 fallenden Vorhangs 3 auf stark unterschiedliche Bahnbreiten einstellen zu können. Die Randbegrenzungsmittel beider Seiten sind spiegelbildlich zueinander aufgebaut und angeordnet. Sie können getrennt voneinander quer verstellt werden.On both longitudinal sides of the coating device, means for limiting the curtain 3 to the desired coating width are arranged below the guide elements 8. The limiting means are respectively fixed to the frame of the nozzle 2, so that they are moved in a displacement of the nozzle 2 in or against the web running direction. In addition, they are mounted displaceably transversely to the web running direction in order to adjust the width of falling on the web 1 curtain 3 to greatly different web widths can. The edge limiting means of both sides are mirror images of each other and arranged. They can be adjusted transversely apart.

Die Randbegrenzungsmittel bestehen jeweils aus zwei klingenförmigen, im wesentlichen senkrecht und mit einem gewissen Abstand voneinander angeordneten Trennelementen 9, 10, die an den Längsseiten einer Bodenplatte 11 befestigt sind. Beide Trennelemente 9, 10 laufen in einer scharfen Trennkante aus, wobei die Höhe der Trennkante des inneren Trennelementes 9 so gering gewählt ist, daß der Vorhang 3 sich nicht von der Innenfläche 12 löst, bevor er auf die Bahn 1 auftrifft. Das innere Trennelement 9 bildet mit dem äußeren Trennelement 10 und der Bodenplatte 11 eine Randrinne 13, die das zwischen den beiden Trennelementen 9,10 aufgefangene Beschichtungsmaterial abführt. Wie aus Fig. 3 ersichtlich, sind die Trennelemente 9,10 gegen Bahnlaufrichtung zur Bildung der Rinne 13 soweit verlängert, daß ihr Ende bis in den Bereich des Leitblechs 6 reicht. Die Bodenplatte 11 verläuft geneigt nach unten, damit das aufgefangene Beschichtungsmaterial in Richtung zur Auffangwanne 5 abläuft.The edge limiting means each consist of two blade-shaped, substantially perpendicular and with a certain distance from each other arranged separating elements 9, 10, which are fixed to the longitudinal sides of a bottom plate 11. Both separating elements 9, 10 run in a sharp separation edge, wherein the height of the separating edge of the inner separating element 9 is chosen so small that the curtain 3 does not detach from the inner surface 12 before it impinges on the web 1. The inner separating element 9 forms, together with the outer separating element 10 and the bottom plate 11, a marginal channel 13 which discharges the coating material collected between the two separating elements 9, 10. As can be seen from FIG. 3, the separating elements 9, 10 are extended against the web running direction to form the groove 13 so far that their end extends into the region of the guide plate 6. The bottom plate 11 is inclined downwards so that the collected coating material runs in the direction of the sump 5.

An der Außenseite des äußeren Trennelementes 10 ist eine Querrinne 14 zum Auffangen des äußeren Vorhangrandes befestigt. Die quer zur Bahnlaufrichtung gemessene Länge jeder Querrinne 14 ist so gewählt, daß bei Einstellung einer minimalen Beschichtungsbreite ihr äußeres Ende bis unter das zugehörige Führungselement 8, also bis über das seitliche Ende des Auslaufschlitzes der Düse 2, reicht. Jede Querrinne 14 weist Seitenwände 15 auf, die in der Höhe bis an die Trennkante des zugehörigen Trennelementes 10 reichen. Das Trennelement 10 bildet die innere Begrenzungswand der Rinne 14. Seine Höhe ist ausreichend groß, so daß der abgetrennte Volumenstrom an Beschichtungsmaterial bei minimaler Beschichtungsbreite aufgefangen und abgeführt werden kann, ohne daß Beschichtungsmaterial überläuft. Bevorzugt verlaufen die Querrinnen 14 jeweils nach innen geneigt, und an ihrem inneren Ende ist im Bereich des Trennelementes 10 jeweils eine Ablaufrinne 16 befestigt. Über die Ablaufrinne 16, die gegen Bahnlaufrichtung ebenfalls bis in den Bereich oberhalb des Leitblechs 6 reicht, wird das aufgefangene Beschichtungsmaterial in die Auffangwanne 5 abgeleitet. Eine nach innen geneigte Querrinne 14 mit einer neben dem Trennelement 10 angeordneten Ablaufrinne 16 hat zwei Vorteile: Zum einen braucht die Auffangwanne 5 sich nur über die axiale Länge der Stützwalze 4 zu erstrecken, da auch bei maximaler Beschichtungsbreite sich die Ablaufrinne 16 noch im Bereich der Gegenwalze befindet. Zum anderen kollidiert das äußere Ende der Querrinne 14 nicht mit der Stützwalze 4, wenn die Trennmesser 9, 10 mit der Querinne 14 zur Einstellung einer minimalen Beschichtungsbreite sehr weit nach innen verschoben werden, wie in Fig. 4 gestrichelt dargestellt ist.On the outside of the outer separator 10, a transverse channel 14 is attached to catch the outer edge of the curtain. The measured transversely to the web running direction length of each transverse groove 14 is selected so that when setting a minimum coating width their outer end to below the associated guide element 8, that extends beyond the lateral end of the outlet slot of the nozzle 2. Each transverse channel 14 has side walls 15, which extend in height up to the separating edge of the associated separating element 10. The partition 10 forms the inner boundary wall of the channel 14. Its height is sufficiently large, so that the separated Volumetric flow of coating material can be collected and removed with minimal coating width, without overflowing coating material. Preferably, the transverse grooves 14 each extend inwardly inclined, and at its inner end in the region of the separating element 10 in each case a drainage channel 16 is attached. Via the gutter 16, which also extends against the web running direction into the area above the baffle 6, the collected coating material is discharged into the drip pan 5. An inwardly inclined transverse channel 14 with a next to the separator 10 arranged gutter 16 has two advantages: Firstly, the drip tray 5 only needs to extend over the axial length of the support roller 4, since even at maximum coating width, the gutter 16 is still in the area Counter roll is located. On the other hand, the outer end of the transverse channel 14 does not collide with the support roller 4, when the separating blades 9, 10 are moved with the transverse groove 14 for setting a minimum coating width very far inward, as shown in phantom in Fig. 4.

Im Betrieb werden die beiden Trennelemente 9, 10 mit der daran befestigten Querrinne 14 soweit nach innen verschoben eingestellt, daß das innere Trennmesser 9 im Bereich der gewünschten Beschichtungskante angeordnet ist. Das äußere Trennelement 10 mit größerer Höhe trennt den äußeren Teil des Vorhangrandes ab, der von der Querrinne 14 aufgefangen und über die Ablaufrinne 16 in die Auffangwanne 5 geleitet wird. Es entsteht so ein schmaler, innerer Vorhang 3, dessen Ränder danach von den inneren Trennelementen 9 abgetrennt und über die Randrinnen 13 abgeleitet werden. Die Innenfläche 12 jedes Trennelements 9 dient dabei als Führung für den Rand des Vorhangteils, der auf die Bahn 1 aufgetragen wird. Die geringe Höhe des Trennelements 9 gewährleistet, daß sich die Vorhangränder nicht vor dem Aufprall auf die Bahn 1 von ihm ablösen.In operation, the two separating elements 9, 10 adjusted with the attached transverse groove 14 so far inwardly adjusted that the inner separating knife 9 is arranged in the region of the desired coating edge. The outer separator 10 of greater height separates the outer part of the curtain edge, which is collected by the transverse channel 14 and passed through the gutter 16 into the drip pan 5. The result is a narrow, inner curtain 3, the edges of which are then separated from the inner separating elements 9 and derived via the edge troughs 13. The inner surface 12 of each partition member 9 serves as a guide for the edge of the curtain part, which is applied to the web 1. The small height of the separating element 9 ensures that the curtain edges do not become detached from the web 1 before impact.

Um eine Wulstbildung an den Längsrändern der Beschichtung auf der Bahn 1 zu vermeiden, ist an der Unterseite jeder Randrinne 13 eine Absaugleitung 17 angeordnet, die über einen Absaugkanal 18 in der Bodenplatte 11 in einem Absaugschlitz 19 in der Innenseite 12 des inneren Trennelements 9 mündet. Der Absaugschlitz 19 verläuft mit einem Abstand von 0,1 mm - 1 mm von der Bahn 1 an der Unterseite des Trennelements 9 im Bereich Vorhangs 3. In Bahnlaufrichtung weist er eine Länge von 2 mm - 15 mm, bevorzugt 3 mm - 5mm, auf, damit die Absaugsaugfunktion bei entsprechenden Schwankungen des Vorhangs 3 gewährleistet bleibt. Die Absaugleitung 17 erstreckt sich unterhalb der Querrinne 14 nach außen und ist an eine Pumpe mit einem Abscheider für das Beschichtungsmaterial angeschlossen. Um Anbackungen im Absaugschlitz 19 zu verhindern, wird dieser mit Wasser gespült. Parallel zu der Absaugleitung 17 führen zu diesem Zweck zwei Wasserleitungen 20 unterhalb der Bodenplatte 11 zum Absaugschlitz 19, die in geringem Abstand vor diesem in den Absaugkanal 18 münden. Das Spülwasser wird gemeinsam mit dem abgesaugten Beschichtungsmaterial über die Absaugleitung 17 weggeführt.In order to avoid beading at the longitudinal edges of the coating on the web 1, a suction line 17 is arranged on the underside of each edge channel 13, which opens via a suction channel 18 in the bottom plate 11 in a suction slot 19 in the inner side 12 of the inner separating element 9. The suction slot 19 extends at a distance of 0.1 mm - 1 mm from the web 1 at the bottom of the separating element 9 in the curtain 3. In the web running direction, it has a length of 2 mm - 15 mm, preferably 3 mm - 5mm so that the Absaugugsfunktion guaranteed with appropriate variations of the curtain 3. The suction line 17 extends outwardly below the transverse channel 14 and is connected to a pump with a separator for the coating material. To prevent caking in the suction slot 19, this is rinsed with water. Parallel to the suction line 17 lead for this purpose, two water pipes 20 below the bottom plate 11 to the suction slot 19, which open at a short distance in front of this in the suction channel 18. The rinsing water is led away together with the extracted coating material via the suction line 17.

Die Länge des Absaugkanals 18 in der Bodenplatte 11 wird von dem Abstand der beiden Trennelemente 9,10 voneinander bestimmt. Sie soll möglichst gering gehalten werden, damit keine zu großen Druckverluste auftreten und Anbackungen im Absaugkanal 18 vermieden werden. Ein kurzer Absaugkanal 18 wird durch eine schmal gestaltete Randrinne 13 ermöglicht, die nur einen geringen Strom an abgetrenntem Beschichtungsmaterial abführen muß.The length of the suction channel 18 in the bottom plate 11 is determined by the distance between the two separating elements 9, 10 from each other. It should be kept as low as possible, so that no excessive pressure losses occur and caking in the suction channel 18 can be avoided. A short suction channel 18 is made possible by a narrow-shaped edge channel 13, which only has to dissipate a small stream of separated coating material.

Um die Vorhangränder an den Innenflächen 12 der Trennelemente 9 zu halten, werden diese mit einer Hilfsflüssigkeit bespült. Bevorzugt wird die Hilfsflüssigkeit so zugeführt, daß sie an der Trennkante des Trennelements 9 austritt und an beiden Seiten des Trennelements 9 herabfließt. Die austretende Hilfsflüssigkeit bildet so ein Flüssigkeitspolster unmittelbar oberhalb der Trennkante des Trennelements 9, das Anbackungen von Beschichtungsmaterial an der Trennkante verhindert.In order to hold the curtain edges on the inner surfaces 12 of the separating elements 9, they are rinsed with an auxiliary liquid. Preferably, the auxiliary liquid is supplied so that it exits at the separating edge of the separating element 9 and flows down on both sides of the separating element 9. The exiting auxiliary liquid thus forms a liquid cushion immediately above the separating edge of the separating element 9, which prevents caking of coating material at the separating edge.

Wie aus Fig. 7 ersichtlich, ist das Trennelement 9 zweiteilig aufgebaut: an der Bodenplatte 11 ist eine in einer scharfen Kante auslaufende Seitenwand 21 befestigt, in deren oberen Teil außen eine senkrechte Nut 22 eingearbeitet ist. Außen auf der Wand 21 ist ein dünnes, klingenförmiges Abdeckblech 23 befestigt, das die Nut 22 abdeckt und so einen an der Trennkante offenen schlitzförmigen Kanal bildet. In den Kanal mündet eine Wasserzufuhr 24. Das mittels der Wasserzufuhr 24 zugeführte Wasser tritt oben im Bereich der Trennkante aus und läuft sowohl an der Innenfläche 12 des Blechs 21 als den Vorhang 3 stabilisierende Hilfsflüssigkeit, als auch entlang der Wand 21 in die Randrinne 13 herunter. Das gesamte Trennelement 9 ist somit von Wasser umspült, so daß auch bei zum Ankleben neigenden Beschichtungsmaterialien das Anhaften von Material an dem 9 verhindert wird.As can be seen from Fig. 7, the separating element 9 is constructed in two parts: on the bottom plate 11 a expiring in a sharp edge side wall 21 is fixed, in the upper part outside a vertical groove 22 is incorporated. Externally on the wall 21, a thin, blade-shaped cover plate 23 is attached, which covers the groove 22 and thus forms an open at the separating edge slot-shaped channel. A water supply 24 opens into the channel. The water supplied by means of the water supply 24 exits at the top in the region of the separating edge and runs down both on the inner surface 12 of the sheet 21 as auxiliary liquid stabilizing the curtain 3 and along the wall 21 into the edge channel 13 , The entire separating element 9 is thus lapped by water, so that even with coating materials prone to sticking the adhesion of material to the 9 is prevented.

Claims (12)

  1. Device for coating a running material web (1), in which the coating material is applied to the web in a free-falling curtain (3), and having dividing elements for dividing off the edges of the curtain (3) to the desired coating width, there being at least one dividing element on each side of the curtain (3), and there being a channel (13), by means of which the caught coating material is led away in or counter to the web running direction, on the outer side of the dividing element that determines the coating width of the material web (1), characterized in that an inner surface (12) of the dividing element that determines the coating width of the material web is flushed with an auxiliary liquid.
  2. Device for coating according to Claim 1, characterized in that the coating material emerges from a slot nozzle.
  3. Device for coating according to either of Claims 1 and 2, characterized in that the dividing element (9) contains inside it a vertical channel which is open at the dividing edge and into which a water supply (24) opens out.
  4. Device for coating according to one or more of Claims 1 to 3, characterized in that the dividing element (9) is constructed in two parts from a side wall (21) and a thin metal covering sheet (23) fastened to the latter, a groove (22) into which a water supply (24) opens out being made in the side wall (21).
  5. Device for coating according to one of Claims 1 to 4, characterized in that two blade-shaped dividing elements (9, 10) are arranged at a distance from each other on each side, the respectively outer dividing element (10) having a greater height than the inner dividing element (9).
  6. Device for coating according to one of Claims 1 to 5, characterized in that a base plate (11) is arranged between the two dividing elements (9, 10) and with the dividing elements (9, 10) forms a channel (13), from which the caught coating material is led away in or counter to the web running direction.
  7. Device for coating according to one of Claims 1 to 6, characterized in that a transverse channel (14), which reaches beyond the lateral end of the outlet slot of the nozzle (2) when the minimum coating width is set, is fastened to the outer dividing element (10).
  8. Device for coating according to Patent Claim 7, characterized in that the transverse channel (14) runs in an inwardly inclined manner, and in that a run-off channel (16), which extends in or counter to the web running direction, is fastened to the inner end of the said transverse channel, in the region of the dividing element (10).
  9. Device for coating according to one of Patent Claims 1 to 8, characterized in that a suction extraction slot (19), which is connected to a suction extraction line (17), is arranged on the inner side (12) of an inner dividing element (9).
  10. Device for coating according to Claim 9, characterized in that the suction extraction slot is arranged on the underside of the dividing element (9) at a distance of 0.1 mm - 1 mm from the web (1) and has a length in the web running direction of 2 mm - 15 mm, preferably 3 mm - 5 mm.
  11. Device for coating according to Claim 9 or 10, characterized in that the suction extraction slot (19) is connected to the suction extraction line (17) via a suction extraction channel (18) in the base plate (11), and in that at least one line (20) for supplying flushing water opens out into the suction extraction channel (18).
  12. Device for coating according to one of Patent Claims 1 to 11, characterized in that the inner dividing element (9) has a cooling system.
EP00985009A 1999-12-23 2000-11-11 Device for coating a running material web Expired - Lifetime EP1239974B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19962844 1999-12-23
DE19962844A DE19962844A1 (en) 1999-12-23 1999-12-23 Method and device for coating a running material web
PCT/EP2000/011170 WO2001047643A1 (en) 1999-12-23 2000-11-11 Method and device for coating a running material web

Publications (2)

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EP1239974A1 EP1239974A1 (en) 2002-09-18
EP1239974B1 true EP1239974B1 (en) 2007-08-22

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US (1) US6709517B1 (en)
EP (1) EP1239974B1 (en)
AT (1) ATE370797T1 (en)
AU (1) AU2157401A (en)
DE (2) DE19962844A1 (en)
WO (1) WO2001047643A1 (en)

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DE10228114A1 (en) † 2002-06-24 2004-01-15 Voith Paper Patent Gmbh Device for painting on both sides and for drying a material web, in particular made of paper or cardboard
DE10316999A1 (en) * 2003-04-11 2004-10-28 Bachofen & Meier Ag Device for coating a running material web
DE10349117A1 (en) * 2003-10-22 2005-05-25 Voith Paper Patent Gmbh Machine for applying a liquid or pasty application medium to the surface of a moving material web
DE10359676A1 (en) * 2003-12-18 2005-07-14 Voith Paper Patent Gmbh Machine for one-sided or two-sided application of a liquid or pasty application medium on the surface of a moving material web and associated operating method
DE10359677A1 (en) * 2003-12-18 2005-07-14 Voith Paper Patent Gmbh Method for one-sided or double-sided curtain or veiling application to the surface of a moving material web, in particular of paper or cardboard
DE102005059966B4 (en) * 2005-12-15 2007-10-31 Polytype Converting S.A. Curtain coater with laterally adjustable fold
JP5169571B2 (en) * 2008-07-22 2013-03-27 株式会社リコー Curtain coating method and apparatus
EP2147724B1 (en) * 2008-07-22 2012-06-20 Ricoh Company, Ltd. Curtain coating apparatus
FI120885B (en) * 2008-11-20 2010-04-15 Metso Paper Inc Kantstyrare
JP2017170365A (en) * 2016-03-24 2017-09-28 デクセリアルズ株式会社 Painting apparatus

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US4559896A (en) * 1983-09-15 1985-12-24 Ciba Geigy Corporation Coating apparatus
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DE50014595D1 (en) 2007-10-04
WO2001047643A1 (en) 2001-07-05
US6709517B1 (en) 2004-03-23
DE19962844A1 (en) 2001-07-05
ATE370797T1 (en) 2007-09-15
EP1239974A1 (en) 2002-09-18
AU2157401A (en) 2001-07-09

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