EP2217384B1 - Device for coating web-shaped materials - Google Patents

Device for coating web-shaped materials Download PDF

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Publication number
EP2217384B1
EP2217384B1 EP09768330A EP09768330A EP2217384B1 EP 2217384 B1 EP2217384 B1 EP 2217384B1 EP 09768330 A EP09768330 A EP 09768330A EP 09768330 A EP09768330 A EP 09768330A EP 2217384 B1 EP2217384 B1 EP 2217384B1
Authority
EP
European Patent Office
Prior art keywords
transfer roll
coating medium
coating
bored holes
holes
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP09768330A
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German (de)
French (fr)
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EP2217384A1 (en
Inventor
Martin Jöhren
Frank Redetzky
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Olbrich GmbH
Original Assignee
Herbert Olbrich GmbH and Co KG
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Publication of EP2217384A1 publication Critical patent/EP2217384A1/en
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Publication of EP2217384B1 publication Critical patent/EP2217384B1/en
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Classifications

    • 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
    • B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
    • B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
    • B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
    • B05C1/0817—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line characterised by means for removing partially liquid or other fluent material from the roller, e.g. scrapers
    • 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
    • B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
    • 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
    • B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
    • B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
    • B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
    • 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
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • 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
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/10—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material
    • 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
    • Y10S118/15—Roller structure

Definitions

  • the invention relates to a device for coating sheet-like materials with a coating medium.
  • the coating medium is a mass such as dyes, dye dispersions or adhesives.
  • the object of the present invention is to provide an improved device which guarantees a uniform coating of the web reliably and reproducibly at different application weights.
  • This object is achieved with a device having the features of claim 1.
  • This new device has instead of a slot nozzle, as shown in the aforementioned prior art, a plurality of holes from which the coating medium flows out in front of the actual coating chamber in the direction of the transfer roller. These holes are distributed over the entire width of the transfer roller, all holes have the same cross-section.
  • these bores are provided in a metal or plastic block, which serves as a nozzle carrier and allows the common mounting of the individual nozzles designed as bores.
  • the nozzle carrier On the surface of the nozzle carrier has an upper plateau surface, which is particularly flat and aligned horizontally, if necessary, is inclined outwards and downwards so that escaping coating medium can flow. All holes end in this plateau surface and have the same height and the same distance to the transfer roller.
  • the bores are arranged in a line or in a row across the width of the transfer roll, this line being parallel to the axis of the transfer roll. Due to a simple manufacturing round cross sections are preferred for the holes. The most favorable diameters of the holes depend on the coating medium. The more viscous the coating medium, the larger the holes are selected. Diameters of 1 to 5 mm have proven themselves. Smaller diameters cause the holes to clog easily.
  • the holes arranged in the nozzle carrier are each provided at the same distance. It has proven to be advantageous to maintain a ratio of the diameter of the holes to the distance between two holes of 1: 4 to 1:20, preferably in the ratio of 1: 7 to 1:10.
  • the holes are supplied in an advantageous embodiment of a common inflow with coating medium.
  • the discharge of the coating medium from the bores takes place in each case as a free jet.
  • a uniform coating of the transfer roller is achieved in that the holes are arranged over the width of the device in a correspondingly advantageous distance, so that the entire width of the gravure roller is wetted with coating medium.
  • the rather narrow free jet impinges on the gravure roll, wherein the majority of the mass of the coating medium of the respective free jet, which emerges from a bore, rinses out and fills the depression of the transfer roll.
  • the free jet splits and a part of it flows directly away from the roll and takes with the air flow or on the outer surface and in the wells of the roller dirt present.
  • Another part of the stream is taken from the transfer roller to the sealing element, where the sealing element retains the excess coating medium and strips from the lateral surface of the transfer roller.
  • the coating medium collects and distributes over the entire width of the transfer roller. It is preferred that more mass of coating medium is discharged through the bores than is necessary for rinsing and prefilling the recess of the transfer roller.
  • the excess amount of coating medium is entrained to the sealing element of the transfer roller and evened out there, since this partial flow is still greater than is necessary to fill the recess of the transfer roller, necessarily results in a forced flow back away from the sealing element in the direction Outside, where the medium can drain off. Due to the existing between the holes open spaces that were not present in the known device, the excess medium can flow freely, resulting in a reproducible outflow of coating medium as a result, and thus ensures a reproducible coating result.
  • the pre-filled depressions of the transfer roller reach via the sealing element in the coating chamber, where the application weight is determined in a known manner by the present there in the coating chamber conditions, in particular pressure conditions.
  • the drawing shows a schematic diagram of a coating apparatus 1 according to the invention, which serves to coat a moving web with a coating medium 6, 6 '.
  • a coating apparatus 1 comprises a counter-roller, not shown, which is provided opposite to the application head 10, not shown in this drawing.
  • the continuous web, not shown, passes between this backing roll and transfer roll 3, receiving the coating medium 6, 6 '.
  • For transporting the coating medium 6, 6 ' has the transfer roller 3 depressions in its lateral surface 5, which are not visible in the drawings. This can be, for example, different engravings.
  • This coating medium 6 fills out the depressions of the transfer roller 3 and the entire gap between the transfer roller 3 and the sealing element 2. This process will be described later.
  • the pre-filled in front of the coating chamber 12 recesses of the transfer roller 3 pass through the sealing element 2 in the coating chamber 12, where the complete filling with coating medium 6 'takes place and the application weight is set by the overpressure selected there.
  • Output of the coating chamber 12 is stripped by means of a doctor blade 13 in a known manner excess coating medium 6 '.
  • the first partial flow 8 of the coating medium 6 still mixes with it in the wells of the transfer roller 3 existing old coating medium and rinses this. It also takes with penetrating air and flushes any existing dirt from the lateral surface 5 of the transfer roller 3 from.
  • This partial stream 8 becomes direct discharged, for example, in a discharge chamber 17.
  • the outlet openings 151 of the holes 15, 15 ' are equal to the plateau surface 141 of the nozzle carrier and all have the same distance from the lateral surface 5 of the transfer roller 3, so that due to the identically shaped holes 15, 15' and the out of the holes 15, 15 'exiting Free jets 7, 7 'show the same flow profiles.
  • the bores 15, 15 'at regular intervals along a line which is parallel to the axis 4 of the transfer roller 3 is provided.
  • these holes 15, 15 'arranged vertically, as well as from Fig. 2 can be seen.
  • Such a bore 15 could also be configured inclined against the direction of movement of the transfer roller 3.
  • the vertical configuration is preferred because for a stable arrangement with inclined holes a larger-sized nozzle carrier 14 must be provided, which should have a sufficient width B2 for the plateau surface 141 in comparison to the width B1 between the holes and the sealing element 2.
  • the sealing element 2 in a receiving space 142 of the nozzle carrier 14 is provided.
  • the nozzle carrier 14 may be made of plastic or metal.
  • the holes 15, 15 ' are fed in this embodiment by a common inflow.
  • a common inflow may be provided within the applicator 10 or a distribution chamber located outside the applicator 10 is used.
  • the holes 15, 15 ' have a round cross-section. This is the simplest solution in terms of manufacturing technology.
  • the holes 15 have a diameter of 2 mm.
  • the distance L of the holes 15, 15 ' is in this example 14 mm, so that a ratio of diameter D of the bores 15, 15' to the distance L between the holes 15, 15 'of 1: 7 results.
  • the ratio of the diameter D of the bore 15, 15 'to the distance L between the bores 15, 15' is chosen to be too large, namely greater than 1:20, then it can not be ensured that the partial flows 9, 9 ', which are up to the sealing element 2 are entrained, evenly distribute the coating medium over the width of the gravure roll 3 or it must be driven with much more mass of coating medium.
  • the prefilled depressions of the transfer roller 3 pass through the sealing element 2 into the coating chamber 12, where the complete filling with coating medium 6 'takes place and the application weight through the there selected overpressure is set.
  • Output of the coating chamber 12 is stripped by means of a doctor blade 13 in a known manner excess coating medium 6 '.
  • the invention is not limited to the embodiment.

Landscapes

  • Coating Apparatus (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)

Description

Die Erfindung betrifft eine Vorrichtung zum Beschichten bahnförmiger Materialien mit einem Beschichtungsmedium. Bei dem Beschichtungsmedium handelt es sich um Massen, wie beispielsweise Farbstoffe, Farbstoffdispersionen oder Klebstoffe.The invention relates to a device for coating sheet-like materials with a coating medium. The coating medium is a mass such as dyes, dye dispersions or adhesives.

Moderne Beschichtungsvorrichtungen, insbesondere Druckmaschinen, verwenden geschlossene Kammerrakelsysteme, da der Einsatz von Kammerrakelvorrichtungen eine gleichmäßige Einfärbung der Übertragungswalzen bei größeren Produktionsgeschwindigkeiten ermöglicht. Eine solche Vorrichtung ist in der europäischen Patentanmeldung EP 1 825 922 A2 gezeigt. Mit dieser bekannten Vorrichtung lässt sich das Beschichtungsmedium unabhängig von der Beschichtungsgeschwindigkeit gleichmäßig auf eine Bahn auftragen, wobei Lufteinschlüsse in der Beschichtungsmasse verhindert werden. Die guten Beschichtungsergebnisse sind jedoch nicht immer reproduzierbar.Modern coating devices, particularly printing machines, use closed chamber doctor blade systems because the use of chamber doctor blades enables uniform inking of the transfer rollers at higher production speeds. Such a device is in the European patent application EP 1 825 922 A2 shown. With this known device, regardless of the coating speed, the coating medium can be uniformly applied to a web, whereby air inclusions in the coating mass are prevented. However, the good coating results are not always reproducible.

Aufgabe der vorliegenden Erfindung ist es, eine verbesserte Vorrichtung zur Verfügung zu stellen, die bei unterschiedlichen Auftragsgewichten eine gleichmäßige Beschichtung der Bahn sicher und reproduzierbar gewährleistet. Diese Aufgabe wird erfindungsgemäß mit einer Vorrichtung mit den Merkmalen des Anspruchs 1 gelöst. Diese neue Vorrichtung besitzt anstatt einer Schlitzdüse, wie sie im vorgenannten Stand der Technik gezeigt ist, mehrere Bohrungen, aus denen das Beschichtungsmedium vor der eigentlichen Beschichtungskammer in Richtung der Übertragungswalze ausströmt. Diese Bohrungen sind über die gesamte Breite der Übertragungswalze verteilt angeordnet, wobei alle Bohrungen den gleichen Querschnitt besitzen. In einer bevorzugten Ausführungsform sind diese Bohrungen in einem Metall- oder Kunststoffblock vorgesehen, der als Düsenträger dient und die gemeinsame Halterung der als Bohrungen ausgestalteten Einzeldüsen ermöglicht. An der Oberfläche besitzt der Düsenträger eine obere Plateaufläche, die insbesondere eben ausgestaltet und waagerecht ausgerichtet, ggf. nach außen und nach unten hin geneigt ist, so dass ausströmendes Beschichtungsmedium abfließen kann. Alle Bohrungen enden in dieser Plateaufläche und haben die gleiche Höhe sowie den gleichen Abstand zur Übertragungswalze. Bei einer bevorzugten Ausführungsform sind die Bohrungen in einer Linie bzw. in einer Reihe über die Breite der Übertragungswalze angeordnet, wobei diese Linie parallel zur Achse der Übertragungswalze ist. Aufgrund einer einfachen Fertigung werden runde Querschnitte für die Bohrungen bevorzugt. Die günstigsten Durchmesser der Bohrungen sind abhängig vom Beschichtungsmedium. Je viskoser das Beschichtungsmedium ist, um so größer werden die Bohrungen gewählt. Durchmesser von 1 bis 5 mm haben sich bewährt. Kleinere Durchmesser führen dazu, dass die Bohrungen leicht verstopfen. Bei größeren Durchmessern ist das Ausströmprofil des Beschichtungsmediums weniger vorhersehbar und schwieriger einstellbar. Die im Düsenträger angeordneten Bohrungen sind jeweils in gleichem Abstand vorgesehen. Es hat sich als vorteilhaft herausgestellt, ein Verhältnis der Durchmesser der Bohrungen zum Abstand zwischen zwei Bohrungen von 1:4 bis 1:20 einzuhalten, vorzugsweise im Verhältnis von 1:7 bis 1:10. Die Bohrungen werden bei einer vorteilhaften Ausführung von einem gemeinsamen Zufluss mit Beschichtungsmedium versorgt.The object of the present invention is to provide an improved device which guarantees a uniform coating of the web reliably and reproducibly at different application weights. This object is achieved with a device having the features of claim 1. This new device has instead of a slot nozzle, as shown in the aforementioned prior art, a plurality of holes from which the coating medium flows out in front of the actual coating chamber in the direction of the transfer roller. These holes are distributed over the entire width of the transfer roller, all holes have the same cross-section. In a preferred embodiment, these bores are provided in a metal or plastic block, which serves as a nozzle carrier and allows the common mounting of the individual nozzles designed as bores. On the surface of the nozzle carrier has an upper plateau surface, which is particularly flat and aligned horizontally, if necessary, is inclined outwards and downwards so that escaping coating medium can flow. All holes end in this plateau surface and have the same height and the same distance to the transfer roller. In a preferred embodiment, the bores are arranged in a line or in a row across the width of the transfer roll, this line being parallel to the axis of the transfer roll. Due to a simple manufacturing round cross sections are preferred for the holes. The most favorable diameters of the holes depend on the coating medium. The more viscous the coating medium, the larger the holes are selected. Diameters of 1 to 5 mm have proven themselves. Smaller diameters cause the holes to clog easily. For larger diameters, the outflow profile of the coating medium is less predictable and more difficult to adjust. The holes arranged in the nozzle carrier are each provided at the same distance. It has proven to be advantageous to maintain a ratio of the diameter of the holes to the distance between two holes of 1: 4 to 1:20, preferably in the ratio of 1: 7 to 1:10. The holes are supplied in an advantageous embodiment of a common inflow with coating medium.

Wie bei der bekannten Vorrichtung gemäß EP 1 825 922 A 2 erfolgt der Austrag des Beschichtungsmediums aus den Bohrungen jeweils als Freistrahl. Eine gleichmäßige Beschichtung der Übertragungswalze wird dadurch erzielt, dass die Bohrungen über die Breite der Vorrichtung in einem entsprechend vorteilhaften Abstand angeordnet sind, so dass die gesamte Breite der Gravurwalze mit Beschichtungsmedium benetzt wird. Der recht schmal dimensionierte Freistrahl trifft auf die Gravurwalze auf, wobei der größte Teil der Masse am Beschichtungsmedium des jeweiligen Freistrahls, der aus einer Bohrung austritt, die Vertiefung der Übertragungswalze ausspült und füllt. Der Freistrahl teilt sich und ein Teil davon fließt direkt von der Walze weg und nimmt beim Abfließen Luft bzw. an der Mantelfläche und in den Vertiefungen der Walze vorhandenen Schmutz mit. Ein weiterer Teil des Stroms wird von der Übertragungswalze bis zum Dichtelement mitgenommen, wo das Dichtelement das überschüssige Beschichtungsmedium zurückhält und von der Mantelfläche der Übertragungswalze abstreift. In diesem Bereich vor dem Dichtelement sammelt und verteilt sich das Beschichtungsmedium über die gesamte Breite der Übertragungswalze. Es wird bevorzugt mehr Masse an Beschichtungsmedium durch die Bohrungen ausgetragen als zum Ausspülen und Vorfüllen der Vertiefung der Übertragungswalze notwendig ist. Der überschüssige Teil an Beschichtungsmedium wird dabei bis an das Dichtelement von der Übertragungswalze mitgeschleppt und vergleichmäßigt sich dort, da dieser Teilstrom immer noch größer ist, als zur Befüllung der Vertiefung der Übertragungswalze notwendig ist, ergibt sich notwendigerweise eine Zwangsströmung zurück von dem Dichtelement weg in Richtung Außenseite, wo das Medium abfließen kann. Aufgrund der zwischen den Bohrungen vorhandenen Freiräume, die bei der bekannten Vorrichtung nicht vorhanden waren, kann das überschüssige Medium ungehindert abfließen, was als Ergebnis zu einer reproduzierbaren Ausströmung an Beschichtungsmedium führt und damit ein reproduzierbares Beschichtungsergebnis gewährleistet.As in the known device according to EP 1 825 922 A 2 the discharge of the coating medium from the bores takes place in each case as a free jet. A uniform coating of the transfer roller is achieved in that the holes are arranged over the width of the device in a correspondingly advantageous distance, so that the entire width of the gravure roller is wetted with coating medium. The rather narrow free jet impinges on the gravure roll, wherein the majority of the mass of the coating medium of the respective free jet, which emerges from a bore, rinses out and fills the depression of the transfer roll. The free jet splits and a part of it flows directly away from the roll and takes with the air flow or on the outer surface and in the wells of the roller dirt present. Another part of the stream is taken from the transfer roller to the sealing element, where the sealing element retains the excess coating medium and strips from the lateral surface of the transfer roller. In this area in front of the sealing element, the coating medium collects and distributes over the entire width of the transfer roller. It is preferred that more mass of coating medium is discharged through the bores than is necessary for rinsing and prefilling the recess of the transfer roller. The excess amount of coating medium is entrained to the sealing element of the transfer roller and evened out there, since this partial flow is still greater than is necessary to fill the recess of the transfer roller, necessarily results in a forced flow back away from the sealing element in the direction Outside, where the medium can drain off. Due to the existing between the holes open spaces that were not present in the known device, the excess medium can flow freely, resulting in a reproducible outflow of coating medium as a result, and thus ensures a reproducible coating result.

Die vorgefüllten Vertiefungen der Übertragungswalze gelangen über das Dichtelement in die Beschichtungskammer, wo das Auftragsgewicht durch die dort in der Beschichtungskammer vorliegenden Bedingungen, insbesondere Druckbedingungen, in bekannter Weise bestimmt wird.The pre-filled depressions of the transfer roller reach via the sealing element in the coating chamber, where the application weight is determined in a known manner by the present there in the coating chamber conditions, in particular pressure conditions.

Weitere Maßnahmen und Vorteile der Erfindung werden anhand der nachfolgenden Beschreibung und den Zeichnungen dargestellt. Die Zeichnungen zeigen:

Fig. 1a
eine Prinzipskizze einer erfindungsgemäßen Beschichtungsvorrichtung,
Fig. 1b
eine Schnittdarstellung durch die erfindungsgemäße Beschichtungsvorrichtung gemäß Fig. 1a,
Fig.2
eine Prinzipskizze von einem Ausschnitt der erfindungsgemäßen Auftragsvorrichtung in Seitenansicht,
Fig.3
eine Prinzipskizze eines Ausschnitts der Auftragsvorrichtung in Draufsicht.
Further measures and advantages of the invention will become apparent from the following description and the drawings. The drawings show:
Fig. 1a
a schematic diagram of a coating apparatus according to the invention,
Fig. 1b
a sectional view through the coating device according to the invention according to Fig. 1a .
Fig.2
a schematic diagram of a section of the applicator device according to the invention in side view,
Figure 3
a schematic diagram of a section of the application device in plan view.

Die Fig.1 der Zeichnung zeigt eine Prinzipskizze einer erfindungsgemäßen Beschichtungsvorrichtung 1, die zur Beschichtung einer bewegten Bahn mit einem Beschichtungsmedium 6, 6' dient. Eine solche Beschichtungsvorrichtung 1 umfasst eine nicht gezeigte Gegenwalze, die gegenüberliegend zum Auftragskopf 10 vorgesehen, in dieser Zeichnung nicht dargestellt ist. Die kontinuierlich fortlaufende Bahn, nicht dargestellt, läuft zwischen dieser Gegenwalze und Übertagungswalze 3 hindurch, wobei sie das Beschichtungsmedium 6, 6' aufnimmt. Zum Transport des Beschichtungsmediums 6, 6' besitzt die Übertragungswalze 3 Vertiefungen in ihrer Mantelfläche 5, die in den Zeichnungen nicht zu sehen sind. Dies können beispielsweise unterschiedliche Gravuren sein.The Fig.1 The drawing shows a schematic diagram of a coating apparatus 1 according to the invention, which serves to coat a moving web with a coating medium 6, 6 '. Such a coating apparatus 1 comprises a counter-roller, not shown, which is provided opposite to the application head 10, not shown in this drawing. The continuous web, not shown, passes between this backing roll and transfer roll 3, receiving the coating medium 6, 6 '. For transporting the coating medium 6, 6 'has the transfer roller 3 depressions in its lateral surface 5, which are not visible in the drawings. This can be, for example, different engravings.

Nach dem Kontakt mit der Bahn sind diese Vertiefungen teilweise entleert, können jedoch noch Reste an Beschichtungsmedium enthalten. Durch die Rotation der Übertragungswalze 3 würden diese Reste des Beschichtungsmediums zusammen mit in den Vertiefungen enthaltener Luft in die Beschichtungskammern 12 der Auftragsvorrichtung 10 eingebracht werden. Dies wird jedoch durch ein Dichtelement 2, welches dichtend an der Mantelfläche 5 der Übertragungswalze 3 anliegt, zum Teil verhindert, da dieses Dichtelement 2 den Spalt zwischen der Beschichtungskammer 12 und der Gravurwalze 3 schließt. Da die Übertragungswalze 3 eine Bewegung ausführt, kann das Abdichten nie vollständig sein. Luft kann noch über die Gravurrillen in die Beschichtungskammer 12 eingetragen werden. Dies wird durch die aus den Bohrungen 15, 15' ausfließenden Ströme an Beschichtungsmedium 6 verhindert. Dieses Beschichtungsmedium 6 füllt die Vertiefungen der Übertragungswalze 3 und den gesamten Spalt zwischen Übertragungswalze 3 und Dichtelement 2 aus. Dieser Vorgang wird später beschrieben. Die vor der Beschichtungskammer 12 vorgefüllten Vertiefungen der Übertragungswalze 3 gelangen über das Dichtelement 2 in die Beschichtungskammer 12, wo die vollständige Befüllung mit Beschichtungsmedium 6' erfolgt und das Auftragsgewicht durch den dort gewählten Überdruck eingestellt wird. Ausgangs der Beschichtungskammer 12 wird mittels einer Rakel 13 in bekannter Weise überschüssiges Beschichtungsmedium 6' abgestreift.After contact with the web these wells are partially emptied, but may still contain residues of coating medium. As a result of the rotation of the transfer roller 3, these residues of the coating medium together with air contained in the depressions would be introduced into the coating chambers 12 of the application device 10. However, this is partially prevented by a sealing element 2, which bears sealingly against the lateral surface 5 of the transfer roller 3, since this sealing element 2 closes the gap between the coating chamber 12 and the gravure roller 3. Since the transfer roller 3 performs a movement, the sealing can never be complete. Air can still be entered via the engraving grooves in the coating chamber 12. This is prevented by the streams of coating medium 6 flowing out of the bores 15, 15 '. This coating medium 6 fills out the depressions of the transfer roller 3 and the entire gap between the transfer roller 3 and the sealing element 2. This process will be described later. The pre-filled in front of the coating chamber 12 recesses of the transfer roller 3 pass through the sealing element 2 in the coating chamber 12, where the complete filling with coating medium 6 'takes place and the application weight is set by the overpressure selected there. Output of the coating chamber 12 is stripped by means of a doctor blade 13 in a known manner excess coating medium 6 '.

Das aus den Ausgangsöffnungen 151 der Bohrungen 15, 15' austretende Beschichtungsmedium 6 strömt als Freistrahl 7, 7' aus und spült frisches Beschichtungsmedium 6 an die Mantelfläche 5 und in die Vertiefungen der Übertragungswalze 3. Der erste Teilstrom 8 des Beschichtungsmediums 6 vermischt sich mit noch in den Vertiefungen der Übertragungswalze 3 vorhandenem alten Beschichtungsmedium und spült dieses aus. Es nimmt des Weiteren eindringende Luft mit und spült ggf. vorhandenen Schmutz von der Mantelfläche 5 der Übertragungswalze 3 ab. Dieser Teilstrom 8 wird direkt abgeführt, beispielsweise in einer Ablaufkammer 17. Der zweite Teilstrom 9 wird von der Übertragungswalze 3 bis an das Dichtelement 2 mitgeschleppt und vergleichmäßigt sich dort, da dieser Teilstrom 9 immer noch größer ist und mehr Beschichtungsmasse mitführt, als zum Vorfüllen der Vertiefungen, beispielsweise der Gravuren, der Übertragungswalze 3 notwendig ist. Dabei ergibt sich nachfolgend eine zurückgerichtete Zwangsströmung, die ebenfalls in der Ablaufkammer 17 endet. Wie am besten aus Fig. 3 zu ersehen, wird diese rückfließende Zwangströmung 9 dadurch möglich, dass zwischen zwei Bohrungen 15, 15' Freiräume 11, 11' vorhanden sind, wo der rückfließende Teilstrom 9 ausreichend Raum zum ungehinderten Abfließen findet. Eine solche Rücktlussmöglichkeit ist bei bekannten Vorrichtungen nicht vorgesehen, wodurch der Rückfluß behindert und nicht reproduzierbar ist.The coating medium 6 emerging from the outlet openings 151 of the bores 15, 15 'flows out as a free jet 7, 7' and rinses fresh coating medium 6 against the lateral surface 5 and into the depressions of the transfer roller 3. The first partial flow 8 of the coating medium 6 still mixes with it in the wells of the transfer roller 3 existing old coating medium and rinses this. It also takes with penetrating air and flushes any existing dirt from the lateral surface 5 of the transfer roller 3 from. This partial stream 8 becomes direct discharged, for example, in a discharge chamber 17. The second partial stream 9 is dragged from the transfer roller 3 to the sealing element 2 and evened out there, since this partial flow 9 is still larger and carries more coating mass, as for prefilling the wells, such as engraving that transfer roller 3 is necessary. This results in the following a returned forced flow, which also ends in the discharge chamber 17. How best Fig. 3 can be seen, this refluxing forced flow 9 is possible in that between two holes 15, 15 'free spaces 11, 11' are present, where the refluxing partial flow 9 finds sufficient space for unimpeded flow. Such Rücktlussmöglichkeit is not provided in known devices, whereby the reflux obstructed and is not reproducible.

Die Ausgangsöffnungen 151 der Bohrungen 15, 15' sind in Höhe der Plateaufläche 141 des Düsenträgers und haben alle den gleichen Abstand zur Mantelfläche 5 der Übertragungswalze 3, so dass aufgrund der gleichgestalteten Bohrungen 15, 15' auch die aus den Bohrungen 15, 15' austretenden Freistrahlen 7, 7' gleiche Strömungsprofile zeigen.The outlet openings 151 of the holes 15, 15 'are equal to the plateau surface 141 of the nozzle carrier and all have the same distance from the lateral surface 5 of the transfer roller 3, so that due to the identically shaped holes 15, 15' and the out of the holes 15, 15 'exiting Free jets 7, 7 'show the same flow profiles.

Wie insbesondere der Fig. 1b zu entnehmen, sind die Bohrungen 15, 15' in gleichmäßigen Abständen entlang einer Linie, die parallel zur Achse 4 der Übertragungswalze 3 ist, vorgesehen. Im Düsenträger 14 sind diese Bohrungen 15, 15' senkrecht angeordnet, wie dies auch aus Fig. 2 zu ersehen ist. Eine solche Bohrung 15 könnte auch entgegen der Bewegungsrichtung der Übertragungswalze 3 geneigt ausgestaltet sein. Die senkrechte Ausgestaltung ist jedoch bevorzugt, da für eine stabile Anordnung mit geneigten Bohrungen ein größer dimensionierter Düsenträger 14 vorgesehen werden muss, der eine ausreichende Breite B2 für die Plateaufläche 141 im Vergleich zur Breite B1 zwischen den Bohrungen und dem Dichtelement 2 besitzen sollte. In vorteilhafter Weise wird das Dichtelement 2 in einem Aufnahmeraum 142 des Düsenträgers 14 vorgesehen. Der Düsenträger 14 kann aus Kunststoff oder Metall gefertigt sein.How the particular Fig. 1b can be seen, the bores 15, 15 'at regular intervals along a line which is parallel to the axis 4 of the transfer roller 3 is provided. In the nozzle carrier 14, these holes 15, 15 'arranged vertically, as well as from Fig. 2 can be seen. Such a bore 15 could also be configured inclined against the direction of movement of the transfer roller 3. However, the vertical configuration is preferred because for a stable arrangement with inclined holes a larger-sized nozzle carrier 14 must be provided, which should have a sufficient width B2 for the plateau surface 141 in comparison to the width B1 between the holes and the sealing element 2. Advantageously, the sealing element 2 in a receiving space 142 of the nozzle carrier 14 is provided. The nozzle carrier 14 may be made of plastic or metal.

Die Bohrungen 15, 15' werden in diesem Ausführungsbeispiel von einem gemeinsamen Zufluss gespeist. Ein solcher gemeinsamer Zufluss kann innerhalb der Auftragsvorrichtung 10 vorgesehen sein oder es wird eine außerhalb der Auftragsvorrichtung 10 angeordnete Verteilkammer benutzt. Es sind auch Einzelzuflüsse in Form von Rohrleitungen und Schläuchen möglich. Eine solche Ausführung ist jedoch gegenüber der vorgeschlagenen und gezeigten Ausführung aufwendiger. Die Bohrungen 15, 15' haben einen runden Querschnitt. Dies ist herstellungstechnisch die einfachste Lösung. Die Bohrungen 15 besitzen einen Durchmesser von 2 mm. Der Abstand L der Bohrungen 15, 15' beträgt in diesem Beispiel 14 mm, so dass sich ein Verhältnis von Durchmesser D der Bohrungen 15, 15' zum Abstand L zwischen den Bohrungen 15, 15' von 1:7 ergibt.The holes 15, 15 'are fed in this embodiment by a common inflow. Such a common inflow may be provided within the applicator 10 or a distribution chamber located outside the applicator 10 is used. There are also individual inflows in the form of pipes and hoses possible. However, such an embodiment is more expensive than the proposed and shown embodiment. The holes 15, 15 'have a round cross-section. This is the simplest solution in terms of manufacturing technology. The holes 15 have a diameter of 2 mm. The distance L of the holes 15, 15 'is in this example 14 mm, so that a ratio of diameter D of the bores 15, 15' to the distance L between the holes 15, 15 'of 1: 7 results.

Durch den kleinen Durchmesser D der Bohrungen 15, 15' wird ein Freistrahl 7, 7' erzielt, der einen wenig aufgefächerten Kernstrahl mit einer ungestörten Strömung besitzt. 1st das Verhältnis des Durchmessers D der Bohrung 15, 15' zum Abstand L zwischen den Bohrungen 15, 15' kleiner als 1:4, so besteht die Gefahr, dass die ungestört ausfließende Strömung des Freistrahls 7 von dem Freistrahl 7' beeinflusst wird. Wird dagegen das Verhältnis von Durchmesser D der Bohrung 15, 15' zum Abstand L zwischen den Bohrungen 15, 15' zu groß gewählt, nämlich größer 1:20, so kann nicht sichergestellt werden, dass die Teilströme 9, 9', die bis an das Dichtelement 2 mitgeschleppt werden, das Beschichtungsmedium gleichmäßig über die Breite der Gravurwalze 3 verteilen bzw. es muss mit wesentlich mehr Masse an Beschichtungsmedium gefahren werden.Due to the small diameter D of the holes 15, 15 ', a free jet 7, 7' is achieved, which has a little fanned nuclear jet with an undisturbed flow. If the ratio of the diameter D of the bore 15, 15 'to the distance L between the bores 15, 15' is less than 1: 4, there is the danger that the undisturbed outflow of the free jet 7 will be influenced by the free jet 7 '. If, on the other hand, the ratio of the diameter D of the bore 15, 15 'to the distance L between the bores 15, 15' is chosen to be too large, namely greater than 1:20, then it can not be ensured that the partial flows 9, 9 ', which are up to the sealing element 2 are entrained, evenly distribute the coating medium over the width of the gravure roll 3 or it must be driven with much more mass of coating medium.

Die vorgefüllten Vertiefungen der Übertragungswalze 3 gelangen über das Dichtelement 2 in die Beschichtungskammer 12, wo die vollständige Befüllung mit Beschichtungsmedium 6' erfolgt und das Auftragsgewicht durch den dort gewählten Überdruck eingestellt wird. Ausgangs der Beschichtungskammer 12 wird mittels einer Rakel 13 in bekannter Weise überschüssiges Beschichtungsmedium 6' abgestreift.The prefilled depressions of the transfer roller 3 pass through the sealing element 2 into the coating chamber 12, where the complete filling with coating medium 6 'takes place and the application weight through the there selected overpressure is set. Output of the coating chamber 12 is stripped by means of a doctor blade 13 in a known manner excess coating medium 6 '.

Die Erfindung ist nicht auf das Ausführungsbeispiel beschränkt.The invention is not limited to the embodiment.

Bezugszeichenliste:LIST OF REFERENCE NUMBERS

11
Vorrichtungcontraption
22
Dichtelementsealing element
33
Übertragungswalzetransfer roller
44
Achse von 3Axis of 3
55
Mantelfläche von 3Lateral surface of 3
6, 6'6, 6 '
Mediummedium
7, 7'7, 7 '
Freistrahlfree jet
88th
Teilstrompartial flow
9, 9'9, 9 '
Teilstrompartial flow
1010
Auftragsvorrichtungapplicator
11, 11'11, 11 '
Freiraumfree space
1212
Beschichtungskammercoating chamber
13 313 3
Rakeldoctor
1414
Düsenträgernozzle carrier
141 1141 1
Plateauflächeplateau surface
142142
Aufnahme für 2Recording for 2
15, 15'15, 15 '
Bohrungdrilling
151 1151 1
Ausgangsöffnungoutput port
17 717 7
Ablaufkammerdrain chamber
B 1B 1
Teilbreite von 14Part width of 14
B2B2
Teilbreite vcn 14Part width vcn 14
DD
Durchmesser von 15Diameter of 15
LL
Abstand von 15, 15'Distance of 15, 15 '

Claims (14)

  1. Apparatus for the coating of web-shaped materials with a coating medium (6),
    with a rotating transfer roll (3), which comprises depressions on its circumferential surface (5) for the transfer of the coating medium (6),
    with an application apparatus (10) for the filling of the depressions of the transfer roll (3) with coating medium (6, 6'), whereby the application apparatus (10) comprises a coating chamber (12) for the coating medium (6'), which coating chamber (12) is bounded on a free outer side by the circumferential surface (5) of the transfer roll (3),
    whereby a rear gap in the motion direction of the transfer roll (3) between circumferential surface (5) and coating chamber (12) is bounded by a doctor blade (13), which lies in a sealed manner on the circumferential surface (5) of the transfer roll (3),
    whereby the forward gap in the motion direction of the transfer roll (3) between circumferential surface (5) and coating chamber (12) is bounded by a seal element (2),
    characterized in that the transfer roll (3) can impinged upon with coating medium (6) before the seal element (2) in the motion direction of the transfer roll (3),
    whereby the coating medium (6) streams out of plural bored holes (15, 15') which are arranged distributed over the width of the transfer roll (3), whereby all of the bored holes (15, 15') have the same cross-section.
  2. Apparatus according to claim 1, characterized in that the bored holes (15, 15') are provided in a common mounting support in the application apparatus (10), preferably in a nozzle carrier (14) of metal or plastic.
  3. Apparatus according to claim 2, characterized in that the outlet openings (151) of the bored holes (15, 15') are provided in equal height, preferably in the height of an upper plateau surface (141) of the nozzle carrier (14).
  4. Apparatus according to one of the claims 1 to 3, characterized in that the outlet openings (151) of the bored holes (15, 15') are arranged in a line parallel to the axis (31) of the transfer roll (3).
  5. Apparatus according to one of the claims 2 to 4, characterized in that a receiver (142) for the seal element (2) is provided in the nozzle carrier (14).
  6. Apparatus according to one of the claims 1 to 5, characterized in that the bored holes (15, 15') have a round cross-section with a diameter (D).
  7. Apparatus according to one of the claims 1 to 6, characterized in that respectively the same spacing distance (L) exists between two neighboring bored holes (15, 15').
  8. Apparatus according to one of the claims 6 or 7, characterized in that the ratio of diameter (D) to spacing distance (L) amounts to 1:4 to 1:20, preferably 1:7 to 1:10.
  9. Apparatus according to one of the claims 2 to 8, characterized in that the bored holes (15, 15') are arranged vertically or perpendicularly in the nozzle carrier (14) so that the coating medium (6) is emitted vertically or perpendicularly to the transfer roll (3).
  10. Apparatus according to one of the claims 2 to 8, characterized in that the bored holes (15, 15') are arranged inclined in the nozzle carrier (14), so that the coating medium (6) is emitted counter to the motion direction of the transfer roll (3).
  11. Apparatus according to one of the claims 1 to 10, characterized in that the discharge of the coating medium (6) out of the bored holes (15, 15') respectively can occur as a free stream (7, 7').
  12. Apparatus according to claim 11, characterized in that at least the largest part of the mass of coating medium (6) of the respective free stream (7, 7') can serve for the pre-filling of the depressions of the transfer roll (3).
  13. Apparatus according to claim 12, characterized in that by means of the free stream (7, 7') more mass of coating medium (6) can be discharged than is necessary for the pre-filling of the depressions, whereby the excess mass of coating medium (6) directly can drain away as partial stream (8) and can be deflected in a direction of the seal element (2) as partial stream (9, 9').
  14. Apparatus according to claim 13, characterized in that by means of the directly draining-away partial stream (8) simultaneously air and present dirt are discharged.
EP09768330A 2008-12-05 2009-11-30 Device for coating web-shaped materials Active EP2217384B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE202008016098U DE202008016098U1 (en) 2008-12-05 2008-12-05 Apparatus for coating web-like materials
PCT/EP2009/008505 WO2010063429A1 (en) 2008-12-05 2009-11-30 Device for coating web-shaped materials

Publications (2)

Publication Number Publication Date
EP2217384A1 EP2217384A1 (en) 2010-08-18
EP2217384B1 true EP2217384B1 (en) 2012-08-29

Family

ID=40418635

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EP09768330A Active EP2217384B1 (en) 2008-12-05 2009-11-30 Device for coating web-shaped materials

Country Status (7)

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US (1) US8424482B2 (en)
EP (1) EP2217384B1 (en)
JP (1) JP5596700B2 (en)
KR (1) KR101628862B1 (en)
DE (1) DE202008016098U1 (en)
ES (1) ES2394300T3 (en)
WO (1) WO2010063429A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019111200A1 (en) * 2019-04-30 2020-11-05 Airbus Operations Gmbh Device for paint application
CN113560112B (en) * 2021-07-26 2022-12-06 山东恒智一建净化工程有限公司 Paint surface device capable of automatically brushing and having supply function

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DE1176528B (en) 1957-07-29 1964-08-20 Boewe Boehler & Weber K G Masc Device for applying liquid, e.g. B. Adhesive
DE3725545A1 (en) * 1987-08-01 1989-02-09 Jagenberg Ag DEVICE FOR COATING A MATERIAL RAIL
US5010840A (en) * 1989-10-30 1991-04-30 Beloit Corporation Short dwell coater apparatus
US5366551A (en) * 1992-03-11 1994-11-22 Institute Of Paper Science And Technology, Inc. Coating device for traveling webs
US5538557A (en) * 1993-08-24 1996-07-23 Beloit Technologies, Inc. Short dwell coater apparatus
US5665163A (en) * 1995-08-22 1997-09-09 Beloit Technologies, Inc. Film applicator with entrained air removal and surface control
US5735957A (en) * 1995-10-02 1998-04-07 Beloit Technologies, Inc. Dual chamber film applicator with in-pond overflow
US5826509A (en) * 1995-10-18 1998-10-27 Deneka; P. Kenneth Printing coating head device
GB9626130D0 (en) 1996-12-17 1997-02-05 Robert Leighton Ltd Improved doctor assembly
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DE19845427A1 (en) 1998-10-02 2000-04-06 Basf Ag Fluid applicator, for applying a polymer or adhesive dispersion onto a moving surface, has a separation element between initial and main fluid supply chambers for defining a separation gap with the surface
JP2002192050A (en) * 2000-12-26 2002-07-10 Fuji Photo Film Co Ltd Coating apparatus and coating method
DE10241251B4 (en) 2002-09-06 2006-05-11 Maschinenfabrik Max Kroenert Gmbh & Co. Method and arrangement for applying a liquid medium to a moving surface
JP2006327198A (en) * 2005-05-23 2006-12-07 Heidelberger Druckmas Ag Apparatus for applying liquid
DE202006003265U1 (en) 2006-02-28 2006-04-27 Herbert Olbrich Gmbh & Co. Kg Device for coating
US20070283826A1 (en) * 2006-06-07 2007-12-13 Morin Philip K Synchronous flexographic printing press with fluid distribution and control system

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US20110048318A1 (en) 2011-03-03
KR101628862B1 (en) 2016-06-09
EP2217384A1 (en) 2010-08-18
DE202008016098U1 (en) 2009-03-05
KR20110091435A (en) 2011-08-11
JP2012510889A (en) 2012-05-17
US8424482B2 (en) 2013-04-23
WO2010063429A1 (en) 2010-06-10
ES2394300T3 (en) 2013-01-30
JP5596700B2 (en) 2014-09-24

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