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EP2852705B1 - Cascade nozzle for applying a plurality of layers - Google Patents

Cascade nozzle for applying a plurality of layers Download PDF

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Publication number
EP2852705B1
EP2852705B1 EP13721262.7A EP13721262A EP2852705B1 EP 2852705 B1 EP2852705 B1 EP 2852705B1 EP 13721262 A EP13721262 A EP 13721262A EP 2852705 B1 EP2852705 B1 EP 2852705B1
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EP
European Patent Office
Prior art keywords
nozzle
application
gap
nozzles
cascade
Prior art date
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Application number
EP13721262.7A
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German (de)
French (fr)
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EP2852705A1 (en
Inventor
Andreas Pesch
Eduard Davydenko
Robert Meitner
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Andritz Kuesters GmbH
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Andritz Kuesters GmbH
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Publication of EP2852705A1 publication Critical patent/EP2852705A1/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
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/007—Slide-hopper coaters, i.e. apparatus in which the liquid or other fluent material flows freely on an inclined surface before contacting the work
    • B05C5/008—Slide-hopper curtain coaters
    • 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
    • B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
    • B05C9/06—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying two different liquids or other fluent materials, or the same liquid or other fluent material twice, to the same side of the work
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/46—Pouring or allowing the fluid to flow in a continuous stream on to the surface, the entire stream being carried away by the paper
    • D21H23/48—Curtain coaters
    • 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
    • B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
    • B05C5/0254—Coating heads with slot-shaped outlet
    • B05C5/0262—Coating heads with slot-shaped outlet adjustable in width, i.e. having lips movable relative to each other in order to modify the slot width, e.g. to close it

Definitions

  • the invention relates to a cascade nozzle for applying a plurality of layers of liquid or pasty application medium on a moving surface, in particular of paper, cardboard or other fiber, according to the preamble of claim 1.
  • WO 2011/145172 A1 is a generic cascade nozzle known.
  • curtain applicator Cosmetic Coater
  • WO 2001/54828 A1 and WO 2005/024133 A1 known.
  • WO 2001/54828 A1 cascade nozzles are known for a multilayer web coating, which operate on the principle of a sliding nozzle.
  • the cascade nozzles are designed as individual nozzles and combined to form a structural unit.
  • the individual nozzles are arranged in parallel one behind the other.
  • the cascade nozzle has a number of individual nozzles corresponding to the number of application layers. This allows the Do not mix application media until they exit the respective nozzle. From these nozzles, the application medium reaches an inclined sliding surface, where the liquid films produced by the individual nozzles are brought together and subsequently passed in the form of a closed multilayer liquid film on the inclined sliding surface to a nozzle lip. At the trailing edge of the nozzle lip forms a multilayer curtain.
  • the application medium or the coating mass should be applied as uniformly as possible over the entire web width.
  • the application thickness must be as constant as possible over the entire web surface.
  • a basic prerequisite for this is a uniform distribution of the coating composition over the outlet width of the cascade nozzle with regard to the volume flow. In order to achieve this, it is known to vary the gap width of the discharge gaps of the application nozzles by means of a device for influencing the transverse profile of the gap width.
  • EP 0 662 386 B1 For the cross profile influencing are off EP 0 662 386 B1 and WO 2011/145172 A1 Devices are known which work with a mechanical profile correction of the gap width.
  • EP 0 662 386 B1 describes a mechanical gap adjustment on a cascade nozzle by the deformation of the nozzle body in the form of a centrally mounted bending beam via screws or piezo elements. This gap adjustment is arranged spatially far away from the nozzle gap and therefore works very inaccurate.
  • WO 2011/145172 A1 It is known to directly deform die lips via adjusting screws located behind them.
  • the adjusting devices are arranged directly on the nozzle columns. The adjustment of the outlet column for the individual layers is possible only at a standstill, since the individual nozzle modules must be moved apart for the adjustment.
  • the object of the invention is therefore to provide a cascade nozzle with a large correction potential in order to ensure a high uniformity of the distribution of the application medium over the outlet width and is inexpensive to manufacture and in operation.
  • a cascade nozzle that combines a mechanical and volumetric cross profile control.
  • the cross profile correction on the outer layers is carried out by means of a mechanical gap adjustment.
  • the transverse profile correction on the inner layers takes place with the aid of a volume flow influencing of the supplied volume flow of application medium, the device for influencing the volume flow operating in zones using valves.
  • the device for influencing the volume flow operating in zones using valves.
  • it is preferably a valve and a control cylinder with servomotor, which are each connected to a supply line for application medium per layer.
  • the volume flow control is adjusted zone by zone over the web run width. The adjustment is possible in online mode without interrupting production, resulting in significant cost advantages.
  • the flat sliding surface formed on the upper side by the end faces of the block-like nozzle parts in a cascade nozzle for forming a flow base for the application medium of the individual layers flowing in stages enables multilayer film flows with thin outer layers in a stable curtain.
  • a thin wetting layer as a lower layer and a thin layer as an upper layer Function layer are applied.
  • the outer layers which moreover usually consist of an expensive application medium, can be applied very thinly with a good transverse profile correction by means of a mechanical gap adjustment.
  • Medium thicker layers, where a sufficiently large volume flow flows, can be easily and cheaply applied by volumetric cross profile correction.
  • the invention relates to a cascade nozzle for applying a plurality of layers of liquid or pasty application medium on a moving paper, cardboard or other fibrous web.
  • the cascade nozzle has at least three individual applicator nozzles 4, 5, 6 extending over the machine width, arranged one behind the other and each having an outlet gap 1, 2, 3 for discharging layers of application medium.
  • the application nozzles 4, 5, 6 between each two nozzle parts. 7 formed and connected to a respective supply line 8 for application medium.
  • the nozzle parts 7 are combined to form a structural unit with the formation of an upper side 9, along which the application medium discharged from the application nozzles 4, 5, 6 slides over to a nozzle lip 10 where it flows off as a multilayer coating curtain.
  • the nozzle parts 7 can be clamped together using a bolt 11 to a nozzle unit, for example.
  • the outlet width of the respective outlet gap 1, 3 of outer applicator nozzles 4, 6 is adjustable via a mechanical gap adjustment 12.
  • the interposed inner application nozzle 5 is associated with a device 13 for controlling the volume flow. If a plurality of inner application nozzles 5 are provided, for example for the formation of a four-, five- or six-layered curtain, then each of these inner application nozzles 5 is preferably associated with such a device 13 for influencing the volume flow.
  • the gap width of the respective outlet gap 1, 3 of the outer application nozzles 4, 6 is set smaller by a spacer 14 than the gap width of the outlet gaps 2 of inner application nozzles 5.
  • the gap widths of the outlet gaps 1, 3 of the outer application nozzles 4, 6 are less than 400 microns, preferably less than 300 microns, set.
  • the gap width of the outlet gap 2 of the respective inner application nozzle 5 is set to 400 to 700 ⁇ m, preferably greater than 500 ⁇ m.
  • the outlet gap 1, 3 of the respective outer application nozzle 4, 6 is bounded on the outside by a nozzle wall 15 which is zonally different zones by means of a series of adjusting elements 16 in their distance to an opposite outlet gap wall 17 for a cross profile adjustment along a web width.
  • the adjustable nozzle wall 15 is preferably lip-shaped.
  • the spacer 14 is, for example, in screws as adjusting elements 16 from formed respective bolt.
  • the device 13 for controlling the volume flow operates in zones using valves 18.
  • Fig. 4 shows for a flow direction F by way of example the construction of a supply line 8 between two nozzle parts 7 under a structural design of these nozzle parts 7. Thereafter, the application medium is fed to a layer via a distribution chamber 19. Between the distribution chamber 19 and the outlet gap 2, the device 13 is provided for the flow control.
  • This device is in each case a valve 18 and a control cylinder with servomotor 20, which adjust the flow rate.
  • a compensation chamber 21 can still be formed downstream of the respective outlet gap 2 according to a machine-width flow gap 22 and in front of the outlet gap 2. It is referred to in this respect DE 10 2009 048 820 A1 ,
  • the cascade nozzle according to Fig. 2 is different from the one in Fig. 1 illustrated and described in that the distribution chamber 19 is formed in the nozzle part 7, on which the other channel elements of the supply line 8 to the outlet gap 2 of the central application nozzle 5 are formed.
  • the cascade nozzle according to Fig. 3 is different from the one in Fig. 2 represented by the fact that two inner application nozzles 5 are provided. Each of these inner application nozzles 5 is assigned to a volume control device 13, which can preferably be adjusted in zones. Incidentally, the above applies accordingly.

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  • Coating Apparatus (AREA)

Description

Die Erfindung betrifft eine Kaskadendüse zum Auftragen mehrerer Schichten von flüssigem oder pastösem Auftragsmedium auf einen bewegten Untergrund, insbesondere aus Papier, Karton oder einem anderen Faserstoff, nach dem Oberbegriff des Anspruchs 1.The invention relates to a cascade nozzle for applying a plurality of layers of liquid or pasty application medium on a moving surface, in particular of paper, cardboard or other fiber, according to the preamble of claim 1.

Aus WO 2011/145172 A1 ist eine gattungsgemäße Kaskadendüse bekannt.Out WO 2011/145172 A1 is a generic cascade nozzle known.

Die Beschichtung einer bewegten Papier- oder Kartonbahn mit einer Streichmasse erfolgt mit einem Vorhangauftragswerk (engl. Curtain Coater). Zur Bildung eines Vorhangs werden Kaskadendüsen eingesetzt, wie beispielsweise aus WO 2001/54828 A1 und WO 2005/024133 A1 bekannt.The coating of a moving paper or board web with a coating compound takes place with a curtain applicator (Curtain Coater). To form a curtain cascade nozzles are used, such as from WO 2001/54828 A1 and WO 2005/024133 A1 known.

Aus WO 2001/54828 A1 sind Kaskadendüsen für eine mehrschichtige Bahnbeschichtung bekannt, die nach dem Prinzip einer Gleitdüse arbeiten. Die Kaskadendüsen werden als einzelne Düsen ausgeführt und zu einer baulichen Einheit zusammengefasst. Die einzelnen Düsen werden parallel hintereinander angeordnet. Die Kaskadendüse weist eine der Anzahl an Auftragsschichten entsprechende Anzahl von einzelnen Düsen auf. Dadurch können sich die Auftragsmedien bis zum Austritt aus der jeweiligen Düse nicht miteinander vermischen. Aus diesen Düsen gelangt das Auftragsmedium auf eine geneigte Gleitfläche, wo die von den einzelnen Düsen erzeugten Flüssigkeitsfilme zusammengeführt und anschließend in Form eines geschlossenen mehrschichtigen Flüssigkeitsfilms auf der geneigten Gleitfläche zu einer Düsenlippe geleitet werden. An der Abströmkante der Düsenlippe bildet sich ein mehrschichtiger Vorhang.Out WO 2001/54828 A1 cascade nozzles are known for a multilayer web coating, which operate on the principle of a sliding nozzle. The cascade nozzles are designed as individual nozzles and combined to form a structural unit. The individual nozzles are arranged in parallel one behind the other. The cascade nozzle has a number of individual nozzles corresponding to the number of application layers. This allows the Do not mix application media until they exit the respective nozzle. From these nozzles, the application medium reaches an inclined sliding surface, where the liquid films produced by the individual nozzles are brought together and subsequently passed in the form of a closed multilayer liquid film on the inclined sliding surface to a nozzle lip. At the trailing edge of the nozzle lip forms a multilayer curtain.

Wie aus DE 10 2009 058 467 A1 bekannt, ist die Bildung einer zusammengeführten mehrschichtigen Filmströmung auf einer geneigten Gleitfläche einer Kaskadendüse vor der Ausbildung des Vorhangs, ohne dass sich die einzelnen Schichten miteinander vermischen, insbesondere dann schwierig, wenn geringe Mengen in den äußeren Schichten aufgetragen werden sollen. Mittlere Schichten mit größeren Auftragsmengen können dann in einem Mehrschicht-Vorhang als stabilisierender Trägerfilm wirken.How out DE 10 2009 058 467 A1 As is known, the formation of a coalesced multilayer film flow on a sloped sliding surface of a cascade nozzle prior to formation of the curtain without intermixing the individual layers is particularly difficult when small amounts are to be applied in the outer layers. Medium sized overlays can then act as a stabilizing carrier film in a multi-layered curtain.

Bei einer Beschichtung einer Papierbahn mit einer Kaskadendüse soll das Auftragsmedium bzw. die Streichmasse möglichst gleichmäßig über die gesamte Bahnbreite aufgetragen werden. Die Auftragsdicke muss möglichst konstant über die gesamte Bahnoberfläche sein. Eine Grundvoraussetzung dafür ist eine gleichmäßige Verteilung der Streichmasse über die Auslaufbreite der Kaskadendüse hinsichtlich des Volumenstroms. Um dies zu erreichen ist es bekannt, die Spaltweite der Auslaufspalte der Auftragsdüsen zu variieren mittels einer Einrichtung zur Querprofilbeeinflussung der Spaltweite.When coating a paper web with a cascade nozzle, the application medium or the coating mass should be applied as uniformly as possible over the entire web width. The application thickness must be as constant as possible over the entire web surface. A basic prerequisite for this is a uniform distribution of the coating composition over the outlet width of the cascade nozzle with regard to the volume flow. In order to achieve this, it is known to vary the gap width of the discharge gaps of the application nozzles by means of a device for influencing the transverse profile of the gap width.

Für die Querprofilbeeinflussung sind aus EP 0 662 386 B1 und WO 2011/145172 A1 Vorrichtungen bekannt, die mit einer mechanischen Profilkorrektur der Spaltweite arbeiten. EP 0 662 386 B1 beschreibt eine mechanische Spaltjustierung an einer Kaskadendüse durch die Verformung des Düsenkörpers in Form eines mittig gelagerten Biegebalkens über Stellschrauben oder Piezoelemente. Diese Spaltverstellung ist räumlich weit weg vom Düsenspalt angeordnet und arbeitet daher sehr ungenau.For the cross profile influencing are off EP 0 662 386 B1 and WO 2011/145172 A1 Devices are known which work with a mechanical profile correction of the gap width. EP 0 662 386 B1 describes a mechanical gap adjustment on a cascade nozzle by the deformation of the nozzle body in the form of a centrally mounted bending beam via screws or piezo elements. This gap adjustment is arranged spatially far away from the nozzle gap and therefore works very inaccurate.

Aus WO 2011/145172 A1 ist bekannt, Düsenlippen über dahinter liegende Stellschrauben direkt zu verformen. Die Verstelleinrichtungen sind dazu unmittelbar an den Düsenspalten angeordnet. Die Verstellung der Auslaufspalte für die einzelnen Schichten ist nur im Stillstand möglich, da die einzelnen Düsenmodule für die Verstellung auseinandergefahren werden müssen.Out WO 2011/145172 A1 It is known to directly deform die lips via adjusting screws located behind them. The adjusting devices are arranged directly on the nozzle columns. The adjustment of the outlet column for the individual layers is possible only at a standstill, since the individual nozzle modules must be moved apart for the adjustment.

Aufgabe der Erfindung ist es daher, eine Kaskadendüse mit einem großen Korrekturpotential zu schaffen, um eine hohe Gleichmäßigkeit der Verteilung des Auftragsmediums über die Auslaufbreite zu gewährleisten und dabei kostengünstig in der Herstellung und im Betrieb ist.The object of the invention is therefore to provide a cascade nozzle with a large correction potential in order to ensure a high uniformity of the distribution of the application medium over the outlet width and is inexpensive to manufacture and in operation.

Diese Aufgabe wird durch die Merkmale des Anspruchs 1 gelöst.This object is solved by the features of claim 1.

Hierdurch wird eine Kaskadendüse geschaffen, die eine mechanische und volumetrische Querprofilsteuerung kombiniert. Die Querprofilkorrektur an den äußeren Schichten erfolgt mit Hilfe einer mechanischen Spaltverstellung. Die Querprofilkorrektur an den inneren Schichten erfolgt mit Hilfe einer Volumenstrombeeinflussung des zugeführten Volumenstroms an Auftragsmedium, wobei die Einrichtung zur Volumenstrombeeinflussung zonenweise arbeitet unter Einsatz von Ventilen. Bei dieser Einrichtung handelt es sich vorzugsweise um ein Ventil und einen Stellzylinder mit Stellmotor, die jeweils an eine Zuführleitung für Auftragsmedium je Schicht angeschlossen sind. Die Volumenstrombeeinflussung wird dabei über die Bahnlaufbreite zonenweise eingestellt. Die Einstellung ist im Online-Betrieb ohne Unterbrechung der Produktion möglich, wodurch sich erhebliche Kostenvorteile ergeben.As a result, a cascade nozzle is created that combines a mechanical and volumetric cross profile control. The cross profile correction on the outer layers is carried out by means of a mechanical gap adjustment. The transverse profile correction on the inner layers takes place with the aid of a volume flow influencing of the supplied volume flow of application medium, the device for influencing the volume flow operating in zones using valves. In this device, it is preferably a valve and a control cylinder with servomotor, which are each connected to a supply line for application medium per layer. The volume flow control is adjusted zone by zone over the web run width. The adjustment is possible in online mode without interrupting production, resulting in significant cost advantages.

Die bei einer Kaskadendüse oberseitig durch die Stirnflächen der blockartigen Düsenteile gebildete ebene Gleitfläche zur Ausbildung eines Fließbodens für das in Stufen ausströmende Auftragsmedium der einzelnen Schichten ermöglicht mehrschichtige Filmströmungen mit dünnen äußeren Schichten in einem stabilen Vorhang. Bei der Beschichtung einer Bahn kann deshalb eine dünne Benetzungsschicht als untere Schicht und eine dünne Schicht als obere Funktionsschicht aufgetragen werden. Erfindungsgemäß können durch eine mechanische Spaltverstellung die äußeren Schichten, die zudem meist aus einem teuren Auftragsmedium bestehen, mit einer guten Querprofilkorrektur sehr dünn aufgetragen werden. Mittlere dickere Schichten, wo ein hinreichend großer Volumenstrom fließt, können in einfacher und billiger Weise durch eine volumetrische Querprofilkorrektur eingestellt aufgetragen werden.The flat sliding surface formed on the upper side by the end faces of the block-like nozzle parts in a cascade nozzle for forming a flow base for the application medium of the individual layers flowing in stages enables multilayer film flows with thin outer layers in a stable curtain. When coating a web, therefore, a thin wetting layer as a lower layer and a thin layer as an upper layer Function layer are applied. According to the invention, the outer layers, which moreover usually consist of an expensive application medium, can be applied very thinly with a good transverse profile correction by means of a mechanical gap adjustment. Medium thicker layers, where a sufficiently large volume flow flows, can be easily and cheaply applied by volumetric cross profile correction.

Weitere Ausgestaltungen der Erfindung sind der nachfolgenden Beschreibung und den Unteransprüchen zu entnehmen.Further embodiments of the invention are described in the following description and the dependent claims.

Die Erfindung wird nachstehend anhand der in den beigefügten Abbildungen dargestellten Ausführungsbeispiele näher erläutert.

  • Fig. 1 zeigt schematisch und teilweise geschnitten ein erstes Ausführungsbeispiel einer Kaskadendüse,
  • Fig. 2 zeigt schematisch und teilweise geschnitten ein zweites Ausführungsbeispiel einer Kaskadendüse,
  • Fig. 3 zeigt schematisch und teilweise geschnitten ein drittes Ausführungsbeispiel einer Kaskadendüse,
  • Fig. 4 zeigt schematisch einen Schnitt eines Teilbereichs einer Einrichtung zur Volumenstrombeeinflussung für eine Querprofilkorrektur entlang eines Bahnbreitenabschnitts.
The invention will be explained in more detail with reference to the embodiments illustrated in the accompanying drawings.
  • Fig. 1 shows schematically and partially in section a first embodiment of a cascade nozzle,
  • Fig. 2 shows schematically and partially in section a second embodiment of a cascade nozzle,
  • Fig. 3 shows schematically and partially in section a third embodiment of a cascade nozzle,
  • Fig. 4 schematically shows a section of a portion of a device for controlling the flow rate for a cross profile correction along a web width section.

Wie Fig. 1 zeigt, betrifft die Erfindung eine Kaskadendüse zum Auftragen mehrerer Schichten von flüssigem oder pastösem Auftragsmedium auf eine bewegte Papier-, Karton- oder andere Faserstoffbahn.As Fig. 1 shows, the invention relates to a cascade nozzle for applying a plurality of layers of liquid or pasty application medium on a moving paper, cardboard or other fibrous web.

Die Kaskadendüse weist mindestens drei einzelne sich über die Maschinenbreite erstreckende, hintereinander angeordnete und jeweils einen Auslaufspalt 1, 2, 3 aufweisende Auftragsdüsen 4, 5, 6 zur Abgabe von Schichten an Auftragsmedium auf. Dazu sind die Auftragsdüsen 4, 5, 6 zwischen jeweils zwei Düsenteilen 7 ausgebildet und an jeweils eine Zuführleitung 8 für Auftragsmedium angeschlossen. Die Düsenteile 7 sind zu einer baulichen Einheit zusammengefasst unter Ausbildung einer Oberseite 9, entlang der das von den Auftragsdüsen 4, 5, 6 abgegebene Auftragsmedium sich überlagernd zu einer Düsenlippe 10 gleitet und dort als mehrschichtiger Beschichtungsvorhang abfließt. Die Düsenteile 7 können beispielsweise unter Verwendung von Bolzen 11 zu einer Düseneinheit miteinander verspannt sein.The cascade nozzle has at least three individual applicator nozzles 4, 5, 6 extending over the machine width, arranged one behind the other and each having an outlet gap 1, 2, 3 for discharging layers of application medium. For this purpose, the application nozzles 4, 5, 6 between each two nozzle parts. 7 formed and connected to a respective supply line 8 for application medium. The nozzle parts 7 are combined to form a structural unit with the formation of an upper side 9, along which the application medium discharged from the application nozzles 4, 5, 6 slides over to a nozzle lip 10 where it flows off as a multilayer coating curtain. The nozzle parts 7 can be clamped together using a bolt 11 to a nozzle unit, for example.

Die Auslaufbreite des jeweiligen Auslaufspaltes 1, 3 von äußeren Auftragsdüsen 4, 6 ist über eine mechanische Spaltverstellung 12 verstellbar. Der dazwischen angeordneten inneren Auftragsdüse 5 ist eine Einrichtung 13 zur Volumenstrombeeinflussung zugeordnet. Sind mehrere innere Auftragsdüsen 5 vorgesehen, beispielsweise für die Ausbildung eines vier-, fünf- oder sechsschichtigen Vorhangs, dann ist jeder dieser inneren Auftragsdüsen 5 vorzugsweise eine solche Einrichtung 13 zur Volumenstrombeeinflussung zugeordnet.The outlet width of the respective outlet gap 1, 3 of outer applicator nozzles 4, 6 is adjustable via a mechanical gap adjustment 12. The interposed inner application nozzle 5 is associated with a device 13 for controlling the volume flow. If a plurality of inner application nozzles 5 are provided, for example for the formation of a four-, five- or six-layered curtain, then each of these inner application nozzles 5 is preferably associated with such a device 13 for influencing the volume flow.

Die Spaltweite des jeweiligen Auslaufspaltes 1, 3 der äußeren Auftragsdüsen 4, 6 ist durch einen Abstandshalter 14 kleiner eingestellt als die Spaltweite der Auslaufspalte 2 von inneren Auftragsdüsen 5.The gap width of the respective outlet gap 1, 3 of the outer application nozzles 4, 6 is set smaller by a spacer 14 than the gap width of the outlet gaps 2 of inner application nozzles 5.

Die Spaltweiten der Auslaufspalte 1, 3 der äußeren Auftragsdüsen 4, 6 sind kleiner 400 µm, vorzugsweise kleiner 300 µm, eingestellt. Die Spaltweite des Auslaufspaltes 2 der jeweiligen inneren Auftragsdüse 5 ist auf 400 bis 700 µm, bevorzugt größer 500 µm, eingestellt.The gap widths of the outlet gaps 1, 3 of the outer application nozzles 4, 6 are less than 400 microns, preferably less than 300 microns, set. The gap width of the outlet gap 2 of the respective inner application nozzle 5 is set to 400 to 700 μm, preferably greater than 500 μm.

Der Auslaufspalt 1, 3 der jeweiligen äußeren Auftragsdüse 4, 6 ist außenseitig begrenzt durch eine Düsenwand 15, die mittels einer Reihe von Stellelementen 16 in ihrem Abstand zu einer gegenüberliegenden Auslaufspaltwand 17 zonenweise unterschiedlich einstellbar ist für eine Querprofileinstellung längs einer Bahnbreite. Die einstellbare Düsenwand 15 ist vorzugsweise lippenförmig ausgebildet. Der Abstandshalter 14 wird beispielsweise bei Schrauben als Stellelemente 16 vom jeweiligen Schraubbolzen gebildet.The outlet gap 1, 3 of the respective outer application nozzle 4, 6 is bounded on the outside by a nozzle wall 15 which is zonally different zones by means of a series of adjusting elements 16 in their distance to an opposite outlet gap wall 17 for a cross profile adjustment along a web width. The adjustable nozzle wall 15 is preferably lip-shaped. The spacer 14 is, for example, in screws as adjusting elements 16 from formed respective bolt.

Die Einrichtung 13 zur Volumenstrombeeinflussung arbeitet zonenweise unter Einsatz von Ventilen 18. Fig. 4 zeigt für eine Strömungsrichtung F beispielhaft den Aufbau einer Zuführleitung 8 zwischen zwei Düsenteilen 7 unter einer konstruktiven Gestaltung dieser Düsenteile 7. Danach wird das Auftragsmedium einer Schicht über eine Verteilerkammer 19 zugeführt. Zwischen der Verteilerkammer 19 und dem Auslaufspalt 2 ist die Einrichtung 13 zur Volumenstrombeeinflussung vorgesehen. Bei dieser Einrichtung handelt es sich jeweils um ein Ventil 18 und einen Stellzylinder mit Stellmotor 20, die den Volumenstrom einstellen. In der Zuführleitung 8 kann vor dem jeweiligen Auslaufspalt 2 noch eine Ausgleichskammer 21 nach einem maschinenbreiten Strömungsspalt 22 und vor dem Auslaufspalt 2 ausgebildet sein. Verwiesen wird insoweit auf DE 10 2009 048 820 A1 .The device 13 for controlling the volume flow operates in zones using valves 18. Fig. 4 shows for a flow direction F by way of example the construction of a supply line 8 between two nozzle parts 7 under a structural design of these nozzle parts 7. Thereafter, the application medium is fed to a layer via a distribution chamber 19. Between the distribution chamber 19 and the outlet gap 2, the device 13 is provided for the flow control. This device is in each case a valve 18 and a control cylinder with servomotor 20, which adjust the flow rate. In the supply line 8, a compensation chamber 21 can still be formed downstream of the respective outlet gap 2 according to a machine-width flow gap 22 and in front of the outlet gap 2. It is referred to in this respect DE 10 2009 048 820 A1 ,

Die Kaskadendüse gemäß Fig. 2 unterscheidet sich von der in Fig. 1 dargestellten und beschriebenen dadurch, dass die Verteilerkammer 19 in dem Düsenteil 7 ausgebildet ist, an dem auch die übrigen Kanalelemente der Zuführleitung 8 zum Auslaufspalt 2 der mittleren Auftragsdüse 5 ausgebildet sind.The cascade nozzle according to Fig. 2 is different from the one in Fig. 1 illustrated and described in that the distribution chamber 19 is formed in the nozzle part 7, on which the other channel elements of the supply line 8 to the outlet gap 2 of the central application nozzle 5 are formed.

Die Kaskadendüse gemäß Fig. 3 unterscheidet sich von der in Fig. 2 dargestellten dadurch, dass zwei innere Auftragsdüsen 5 vorgesehen sind. Jede dieser inneren Auftragsdüsen 5 ist einer Einrichtung 13 zur Volumensteuerung zugeordnet, wobei diese vorzugsweise zonenweise einstellbar ist. Im Übrigen gilt das vorstehend Gesagte entsprechend.The cascade nozzle according to Fig. 3 is different from the one in Fig. 2 represented by the fact that two inner application nozzles 5 are provided. Each of these inner application nozzles 5 is assigned to a volume control device 13, which can preferably be adjusted in zones. Incidentally, the above applies accordingly.

Für alle Ausführungsbeispiele gilt, dass die Düsenteile 7, ausgenommen die endseitigen, jeweils beidseitig Auftragsdüsen 4, 5, 6 ausbilden. Alle inneren Düsenteile 7 sind vorder- und rückseitig für die Bildung der Auftragsdüsen 4, 5, 6 mit zugehörigen Zuführleitungen 8 konstruktiv ausgelegt. Hierdurch wird eine kompakte Bauweise aus miteinander verklemmten Düsenteilen 7 erreicht, wobei vorzugsweise alle Düsenteile 7 zu einer Düseneinheit fixiert sind. Dies kann über die durchgehende Klemmung mittels des Bolzens 11 erfolgen. Zwischen endseitigen Düsenteilen 7 angeordnete Düsenteile 7 bilden dann vorder- und rückseitig eine Auftragsdüse 4, 5, 6 mit jeweils einem benachbart anschließenden Düsenteil 7 aus.For all embodiments, the nozzle parts 7, with the exception of the end-side, in each case application nozzles 4, 5, 6 on both sides, form. All inner nozzle parts 7 are designed front and back for the formation of the application nozzles 4, 5, 6 with associated supply lines 8 constructive. As a result, a compact construction of jammed-together nozzle parts 7 is achieved, wherein preferably all the nozzle parts 7 are fixed to a nozzle unit. This can be over the continuous Clamping done by means of the bolt 11. Nozzle parts 7 arranged between end-side nozzle parts 7 then form an application nozzle 4, 5, 6 with an adjoining adjoining nozzle part 7 on the front and on the back.

Claims (6)

  1. Cascade nozzle for applying a plurality of layers of liquid or pasty application medium to a moving paper, cardboard or other fibrous web having at least three individual application nozzles (4, 5, 6), which extend over the machine width, are arranged behind one another, and have in each case one outlet gap (1, 2, 3), for discharging layers of application medium, to which end the application nozzles (4, 5, 6) are configured between in each case two nozzle parts (7) and are connected to in each case one feed line (8) for application medium, the nozzle parts (7) are combined to form one structural unit, with the formation of an upper side (9), along which the application medium which is output by the application nozzles (4, 5, 6) slides in a manner superimposed on itself to a nozzle lip (10) and flows away there as a multiple-layer coating curtain, the outlet width of the respective outlet gap (1, 3) of outer application nozzles (4, 6) can be adjusted via a mechanical gap adjustment means (12), and the inner application nozzle or nozzles (5) which is/are arranged in between is/are assigned in each case one device (13) for influencing the volumetric flow, characterized in that the gap width of the outlet gap (2) of an inner application nozzle (5) is set to from 400 to 700 µm, preferably more than 500 µm, and the transverse profile correction on the inner layers takes place with the aid of a volumetric flow influence of the volumetric flow of application medium which is fed in, the device (13) for influencing the volumetric flow operating in zones with the use of valves (18).
  2. Cascade nozzle according to Claim 1, characterized in that the gap width of the respective outlet gap (1, 3) of the outer application nozzles (4, 6) is set by way of a spacer element (14) to be smaller than the gap width of the outlet gaps (2) of inner application nozzles (5).
  3. Cascade nozzle according to Claim 1 or 2, characterized in that the gap widths of the outlet gaps (1, 3) of the outer application nozzles (4, 6) are selected to be smaller than 400 µm, preferably smaller than 300 µm.
  4. Cascade nozzle according to one of Claims 1 to 3, characterized in that the outlet gap (1, 3) of the respective outer application nozzle (4, 6) is delimited on the outer side by way of a nozzle wall (15) which can have its spacing from an opposite outlet gap wall (17) set differently in zones by means of a series of setting elements (16).
  5. Cascade nozzle according to Claim 4, characterized in that the adjustable nozzle wall (15) is of lip-shaped configuration.
  6. Cascade nozzle according to one of Claims 1 to 5, characterized in that nozzle parts (7) which are arranged between end-side nozzle parts (7) configure, on the front side and rear side, an application nozzle (4, 5, 6) with in each case one adjacently neighbouring nozzle part (7).
EP13721262.7A 2012-05-22 2013-05-02 Cascade nozzle for applying a plurality of layers Active EP2852705B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012010050A DE102012010050A1 (en) 2012-05-22 2012-05-22 Cascade nozzle for applying several layers
PCT/EP2013/001291 WO2013174474A1 (en) 2012-05-22 2013-05-02 Cascade nozzle for applying a plurality of layers

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EP2852705A1 EP2852705A1 (en) 2015-04-01
EP2852705B1 true EP2852705B1 (en) 2017-11-22

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EP13721262.7A Active EP2852705B1 (en) 2012-05-22 2013-05-02 Cascade nozzle for applying a plurality of layers

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EP (1) EP2852705B1 (en)
DE (1) DE102012010050A1 (en)
WO (1) WO2013174474A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2894254B1 (en) * 2014-01-08 2019-08-21 Valmet Technologies, Inc. Coating device for applying coating color onto a fiber web and method for coating of a fiber web

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5464577A (en) 1994-01-04 1995-11-07 Minnesota Mining And Manufacturing Company Method of thickness control for dies
SE515824C2 (en) 2000-01-26 2001-10-15 Tetra Laval Holdings & Finance Method for manufacturing a multilayered packaging laminate by wet coating, as well as laminates made according to the procedure
JP3823820B2 (en) * 2001-08-24 2006-09-20 三菱マテリアル株式会社 Coating device
FI114726B (en) 2003-09-10 2004-12-15 Metso Paper Inc Arrangement in the nozzle beam of a fiber web coating device
DE102009048820A1 (en) 2009-10-09 2011-04-14 Andritz Küsters Gmbh Curtain applicator
DE102009058467B4 (en) 2009-12-16 2012-12-06 Andritz Küsters Gmbh Curtain applicator
JPWO2011145172A1 (en) 2010-05-18 2013-07-22 フォイト パテント ゲゼルシャフト ミット ベシュレンクテル ハフツングＶＯＩＴＨ ＰＡＴＥＮＴ ＧｍｂＨ DF coater head

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EP2852705A1 (en) 2015-04-01
WO2013174474A1 (en) 2013-11-28
DE102012010050A1 (en) 2013-11-28

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