EP3180475B1 - Coating device - Google Patents

Coating device Download PDF

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Publication number
EP3180475B1
EP3180475B1 EP15753634.3A EP15753634A EP3180475B1 EP 3180475 B1 EP3180475 B1 EP 3180475B1 EP 15753634 A EP15753634 A EP 15753634A EP 3180475 B1 EP3180475 B1 EP 3180475B1
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EP
European Patent Office
Prior art keywords
cross
medium
machine direction
distribution pipe
base body
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EP15753634.3A
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German (de)
French (fr)
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EP3180475B2 (en
EP3180475A1 (en
Inventor
Christoph Henninger
Jochen Meinel
Gerd THIEL
Jan APPRICH
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Voith Patent GmbH
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Voith Patent GmbH
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Classifications

    • 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
    • D21H23/24—Addition to the formed paper during paper manufacture
    • 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
    • B05C1/0813—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 supplying liquid or other fluent material to the roller
    • 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
    • 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
    • D21H23/52—Addition to the formed paper by contacting paper with a device carrying the material
    • D21H23/56—Rolls
    • 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
    • B05C1/0826—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 the work being a web or sheets

Definitions

  • the invention relates to a device for direct or indirect application of a liquid or pasty medium to a moving material web, in particular fibrous web, such as paper, board or tissue web, according to the preamble of patent claim 1.
  • coating units a liquid or pasty medium in the form of starch, glue or coating color is applied to the moving fibrous web.
  • coating units are well known in the art and include various embodiments andWhenverfah ren.
  • liquid or pasty medium is applied in excess directly to the fibrous web and then partially removed by means of a blade or a doctor blade to produce a defined layer thickness of the medium.
  • liquid or pasty medium is applied in excess directly to a roller, so-called application roller, and then partially removed again from the application roller to produce a defined layer thickness of the medium by means of a blade or a doctor blade before the medium is transferred in a transfer nip of the applicator roll on the fibrous web.
  • such coating units have a so-called medium distribution tube by means of which the liquid or pasty medium is first distributed in the cross-machine direction before it passes through an outlet opening of a medium discharge chamber and is applied to the roller or material web.
  • the medium distribution pipe is designed by a hollow cylindrical base body with an oval, in particular circular or elliptical cross-sectional shape
  • the body of the Mediumverteilrohrs by one or more commercially available (s) standard tube (s) can be provided inexpensively.
  • the hollow cylindrical body is made quite thick-walled, i. has a wall thickness of 3 millimeters or more, this can in addition to the task of transverse distribution -d.h.
  • the cross machine direction of the medium at least provide a part of the dimensional stability of the applicator unit against deflection in the cross machine direction.
  • the otherwise responsible for the dimensional stability support beams can be made much simpler or it can be completely dispensed with.
  • the outflow can be completely provided by holes in the hollow body without these, for example, must be provided by separate cylinder sleeves with a defined length, which is necessary in the known thin-walled Mediumverteilrohren to over provide the discharge channels necessary pressure drop, which is necessary for a uniform outflow of the medium over the length of the medium distribution pipe in the cross-machine direction.
  • a criterion for selecting the wall thicknesses of the hollow cylindrical base body may be its length in the cross machine direction, whereby different requirements for providing the dimensional stability accrue.
  • As a further criterion for the determination of the wall thickness of the hollow cylindrical body of the required pressure drop can be used by the outflow.
  • Investigations of Applicant in this connection revealed that the hollow cylindrical body preferably has a wall thickness in the range of 4 to 25 millimeters, preferably 8 to 20 millimeters.
  • the wall thickness of the medium distribution tube and its length are preferably matched to one another in such a way that the dimensional stability of the application unit relative to deflection along the transverse direction of the machine is essentially provided by the medium distribution tube.
  • the hollow cylindrical body can also have a diameter in the range of 70-200 millimeters, in particular 100-150 millimeters, which, in conjunction with the increased wall thickness compared to the prior art, whose dimensional stability against deflection in the cross-machine direction is significantly increased. If the base body does not have a circular cross-sectional shape, but if it is elliptical, for example, then this preferably has a cross-sectional area which, in the case of a circular cross-sectional shape, corresponds to the above-indicated diameter range.
  • the hollow cylindrical base body is formed by at least one metallic tube having an oval, in particular circular or elliptical cross-sectional shape.
  • the basic body is provided by one or more standard pipes, for example of stainless steel.
  • the at least one metallic tube may in this case be a welded tube or a seamless tube.
  • the base body can also be formed from a single tube with the length of the base body. It is also conceivable that the base body is formed of a plurality of tubes of lesser length than the base body, which are arranged in the machine transverse direction oriented one behind the other and connected to each other at their mutually facing end sides, in particular welded together, are.
  • the radially inner circumferential surface of the hollow cylindrical base body is ground and / or polished.
  • the radially inner circumferential surface has a roughness in the range of 0.1-3.0 microns R a , preferably in the range of 0.2-1.6 microns R a , more preferably in the range of 0.3-0.9 ⁇ m R a .
  • the outflow channels are preferably formed by bores in the hollow cylindrical basic body. This can further reduce manufacturing costs and material costs, since the outflow channels do not have to be provided by separate hollow cylindrical sleeves. To continue the manufacturing effort To reduce it is particularly advantageous if the holes are introduced into the hollow cylindrical body before it is ground and / or polished. As a result, burrs that arise during drilling can be removed immediately with the subsequent grinding and / or polishing.
  • the holes preferably have a diameter in the range of 4-15 millimeters at the minimum cross-sectional area.
  • the Mediumverteilrohr is usually supplied at one of its end faces by at least one, in particular a Zuströmtechnisch with the liquid or pasty medium. It is preferably provided that the at least one inflow line has an oval, in particular circular or elliptical cross-sectional shape. Preferably, the inflow line in particular has the same cross-sectional shape as the medium distribution tube.
  • the transition between the medium distribution pipe and the inflow pipe can be made particularly simple and also has no "blind spots" in which undesired deposits of the medium can accumulate, as is the case, for example, when the cross-sectional shapes of the inflow pipe and the medium distribution pipe differ from one another.
  • the inflow line at the transition to the medium distribution pipe has the same size cross-sectional area and the same cross-sectional shape as the medium distribution pipe. This is possible in particular if the cross-sectional area of the inflow line expands or tapers conically from a point further from the transition to the transition to the medium distribution tube.
  • the distance from the first transverse to the last outflow in the cross machine direction are coordinated so that the considered in the cross machine direction pressure drop of the liquid or pasty medium from the first to the last outflow channel is less than the pressure drop of the liquid or pasty medium through each of the outflow channels.
  • the distance between the first and last discharge channel in the cross-machine direction is equal to the width of the web. Is, for example, the Web width 10 000 millimeters, so the distance between the first and last discharge channel in the cross machine direction is also 10 000 millimeters.
  • the device additionally comprises a support beam, wherein the medium distribution pipe opposite the support beam a part, e.g. at least 25%, in particular the larger part, i. more than 50% providing dimensional stability.
  • the application unit additionally comprises a leveling device, by means of which the liquid or pasty medium applied to the web or roller is partially removed and / or homogenized, finally on the material web, in particular fibrous web, a layer formed from the medium in the machine direction and cross machine direction to provide the same and defined thickness.
  • a leveling device by means of which the liquid or pasty medium applied to the web or roller is partially removed and / or homogenized, finally on the material web, in particular fibrous web, a layer formed from the medium in the machine direction and cross machine direction to provide the same and defined thickness.
  • the length of the medium distribution tube is more than 1m, preferably more than 2m, more preferably more than 3m.
  • the medium distribution pipe extends over the entire cross-machine direction, or the entire width of the material web.
  • the invention will be further explained with reference to a schematic drawing.
  • the single figure shows an application unit 2 of a device 1 according to the invention for direct or indirect application of a liquid or pasty medium to a moving material web in cross-section.
  • the machine transverse direction extends perpendicular to the plane of the drawing.
  • the applicator unit 2 has a medium distribution tube 3 extending in its length in the cross machine direction of the device, which communicates via a plurality of outflow channels 4 arranged one behind the other in the cross machine direction with a medium discharge chamber 5 extending in the cross machine direction in such a way that the liquid or pasty medium first enters the Medium distribution pipe 3 is distributed in the cross-machine direction and fed through the outflow 4 of the medium discharge chamber 5 before it passes through an outlet opening 6 of the medium discharge chamber 5 and in the present case is applied to the roller 7.
  • the medium discharge chamber 5 here comprises a front and a rear lip 8, 9 and a front chamber bottom 10 and a rear chamber bottom 11th
  • the Mediumverteilrohr 3 is presently formed by a hollow cylindrical body with a circular cross-sectional shape and a wall thickness of 8-14 millimeters.
  • the hollow cylindrical body has a diameter in the range 120-150 millimeters and is formed by a stainless steel tube or more stainless steel tubes, the stainless steel tube or the plurality of stainless steel tubes is seamless or are. Furthermore, the radially inner surface of the stainless steel tube or stainless steel tubes is ground to a roughness of 0.4-0.7 microns Ra and / or polished.
  • the outflow channels 4 are formed by bores in the hollow cylindrical basic body 3.
  • the length of the medium distribution pipe 3 in the cross machine direction is usually more than 1 m. In modern plants, this length may also be significantly higher, e.g. more than 2m, up to 10m or more.
  • the hollow cylindrical body is often formed by a plurality of pipes, especially stainless steel pipes, which are e.g. are joined together by welding.

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  • Paper (AREA)
  • Coating Apparatus (AREA)

Description

Die Erfindung betrifft eine Vorrichtung zum direkten oder indirekten Auftragen eines flüssigen oder pastösen Mediums auf eine laufende Materialbahn, insbesondere Faserstoffbahn, wie Papier-, Karton- oder Tissuebahn, nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a device for direct or indirect application of a liquid or pasty medium to a moving material web, in particular fibrous web, such as paper, board or tissue web, according to the preamble of patent claim 1.

Mit solchen Vorrichtungen, oftmals auch Streichaggregate genannt, wird ein flüssiges oder pastöses Medium in Form von Stärke, Leim oder Streichfarbe auf die laufende Faserstoffbahn aufgetragen. Solche Streichaggregate sind im Stand der Technik hinreichend bekannt und umfassen verschiedene Ausgestaltungen und Auftragsverfah ren.With such devices, often also called coating units, a liquid or pasty medium in the form of starch, glue or coating color is applied to the moving fibrous web. Such coating units are well known in the art and include various embodiments and Auftragverfah ren.

Beim sog. direkten Auftrag wird bei einer Variante das flüssige oder pastöse Medium im Überschuss direkt auf die Faserstoffbahn aufgebracht und anschließend zur Herstellung einer definierten Schichtdicke des Mediums mittels einer Klinge oder eines Rakels teilweise abgetragen. Beim sog. indirekten Auftrag wird bei einer Variante das flüssige oder pastöse Medium im Überschuss direkt auf eine Walze, sog. Auftragswalze, aufgebracht und anschließend zur Herstellung einer definierten Schichtdicke des Mediums mittels einer Klinge oder eines Rakels teilweise wieder von der Auftragswalze abgetragen bevor das Medium in einem Übertragungsspalt von der Auftragswalze auf die Faserstoffbahn übertragen wird.In so-called direct application, in one variant, the liquid or pasty medium is applied in excess directly to the fibrous web and then partially removed by means of a blade or a doctor blade to produce a defined layer thickness of the medium. In the case of so-called indirect application, in one variant the liquid or pasty medium is applied in excess directly to a roller, so-called application roller, and then partially removed again from the application roller to produce a defined layer thickness of the medium by means of a blade or a doctor blade before the medium is transferred in a transfer nip of the applicator roll on the fibrous web.

Zur gleichmäßigen Verteilung des Mediums in Maschinenquerrichtung weisen solche Streichaggregate ein sog. Mediumverteilrohr auf mittels dem das flüssige oder pastöse Medium zuerst in Maschinenquerrichtung verteilt wird, bevor dieses durch eine Austrittsöffnung einer Mediumaustragskammer tritt und auf die Walze oder Materialbahn aufgebracht wird.For even distribution of the medium in the cross-machine direction, such coating units have a so-called medium distribution tube by means of which the liquid or pasty medium is first distributed in the cross-machine direction before it passes through an outlet opening of a medium discharge chamber and is applied to the roller or material web.

Solche Mediumverteilrohre sind bei den heute bekannten Streichaggregaten oftmals entweder durch geometrisch komplexe und aufwändige Schweißkonstruktionen oder durch geometrisch komplexe und noch aufwändigere aus dem Vollmaterial gebildete Grundkörper aufgebaut, die in der Herstellung teuer sind. Ferner übernehmen die Mediumverteilrohre bei den heute bekannten Streichaggregaten lediglich die Aufgabe der Querverteilung bzw. Verteilung in Maschinenquerrichtung des Mediums. Aufgrund von stetigem Kostendruck in der Papierindustrie ist es notwendig bei gleicher oder sogar verbesserter Performance nach kostengünstigeren als den bekannten Lösungen zu suchen, um wettbewerbsfähig zu bleiben.Such Mediumverteilrohre are often constructed in the today known Streichaggregaten either by geometrically complex and elaborate weldments or by geometrically complex and even more complex from the solid material formed body, which are expensive to manufacture. Furthermore, take over the medium distribution pipes in the currently known coating units only the task of transverse distribution or distribution in the cross-machine direction of the medium. Owing to With constant cost pressures in the paper industry, it is necessary to look for lower cost than known solutions for the same or even improved performance in order to remain competitive.

Es ist somit die Aufgabe der vorliegenden Erfindung, eine kostengünstigere Lösung für ein solches Streichaggregat vorzuschlagen.It is thus the object of the present invention to propose a less expensive solution for such a coating unit.

Die Aufgabe wird durch eine Vorrichtung mit den Merkmalen des Patentanspruchs 1 gelöst.The object is achieved by a device having the features of patent claim 1.

Dadurch dass das Mediumverteilrohr durch einen hohlzylindrischen Grundkörper mit einer ovalen, insbesondere kreisrunden oder elliptischen Querschnittsform ausgeführt ist, kann der Grundkörper des Mediumverteilrohrs durch ein oder mehrere frei im Handel verfügbare(s) Norm-Rohr(e) kostengünstig bereitgestellt werden.The fact that the medium distribution pipe is designed by a hollow cylindrical base body with an oval, in particular circular or elliptical cross-sectional shape, the body of the Mediumverteilrohrs by one or more commercially available (s) standard tube (s) can be provided inexpensively.

Dadurch dass der hohlzylindrische Grundkörper recht dickwandig ausgeführt ist, d.h. eine Wandstärke von 3 Millimeter oder mehr hat, kann dieser zusätzlich zur Aufgabe der Querverteilung -d.h. Verteilung in Maschinenquerrichtung- des Mediums zumindest einen Teil der Dimensionsstabilität der Auftragseinheit gegenüber Durchbiegung in Maschinenquerrichtung bereitstellen. Hierdurch kann der sonst für die Dimensionsstabilität zuständige Tragbalken deutlich einfacher ausgeführt sein oder es kann auf diesen vollständig verzichtet werden.Due to the fact that the hollow cylindrical body is made quite thick-walled, i. has a wall thickness of 3 millimeters or more, this can in addition to the task of transverse distribution -d.h. In the cross machine direction of the medium at least provide a part of the dimensional stability of the applicator unit against deflection in the cross machine direction. As a result, the otherwise responsible for the dimensional stability support beams can be made much simpler or it can be completely dispensed with.

Durch die Wandstärke des hohlzylindrischen Grundkörpers von 3 Millimetern oder mehr können ferner die Ausströmkanäle komplett durch Bohrungen im Hohlkörper bereitgestellt werden ohne dass diese bspw. durch separate Zylinderhülsen mit einer definierten Länge bereitgestellt werden müssen, was bei den bekannten dünnwandigen Mediumverteilrohren notwendig ist, um den über die Ausströmkanäle notwendigen Druckabfall bereitzustellen, was für eine gleichmäßige Ausströmung des Mediums über die Länge des Mediumverteilrohrs in Maschinenquerrichtung notwendig ist.Due to the wall thickness of the hollow cylindrical body of 3 millimeters or more, the outflow can be completely provided by holes in the hollow body without these, for example, must be provided by separate cylinder sleeves with a defined length, which is necessary in the known thin-walled Mediumverteilrohren to over provide the discharge channels necessary pressure drop, which is necessary for a uniform outflow of the medium over the length of the medium distribution pipe in the cross-machine direction.

Vorteilhafte Ausgestaltungen und Weiterbildungen sind in den Unteransprüchen angegeben.Advantageous embodiments and further developments are specified in the subclaims.

Ein Kriterium zur Auswahl der Wandstäke des hohlzylindrischen Grundkörpers kann dessen Länge in Maschinenquerrichtung sein, wodurch unterschiedliche Anforderungen zur Bereitstellung der Dimensionsstabilität erwachsen. Als weiteres Kriterium für die Festlegung der Wandstärke des hohlzylindrischen Grundkörpers kann der benötigte Druckabfall durch die Abströmkanäle herangezogen werden. Untersuchungen der Anmelderin ergeben in diesem Zusammenhang, dass der hohlzylindrische Grundkörper vorzugsweise eine Wandstärke im Bereich von 4 - 25 Millimeter, bevorzugt 8 - 20 Millimeter hat. Vorzugsweise sind die Wandstärke des Mediumverteilrohrs und dessen Länge derart aufeinander abgestimmt, dass die Dimensionsstabilität der Auftragseinheit gegenüber Durchbiegung entlang der Maschinenquerrichtung im Wesentlichen durch das Mediumverteilrohr bereitgestellt wird.A criterion for selecting the wall thicknesses of the hollow cylindrical base body may be its length in the cross machine direction, whereby different requirements for providing the dimensional stability accrue. As a further criterion for the determination of the wall thickness of the hollow cylindrical body of the required pressure drop can be used by the outflow. Investigations of Applicant in this connection revealed that the hollow cylindrical body preferably has a wall thickness in the range of 4 to 25 millimeters, preferably 8 to 20 millimeters. The wall thickness of the medium distribution tube and its length are preferably matched to one another in such a way that the dimensional stability of the application unit relative to deflection along the transverse direction of the machine is essentially provided by the medium distribution tube.

Der hohlzylindrische Grundkörper kann ferner einen Durchmesser im Bereich von 70-200 Millimeter, insbesondere 100-150 Millimeter haben, wodurch in Verbindung mit der gegenüber dem Stand der Technik erhöhten Wandstärke, dessen Dimensionsstabilität gegenüber Durchbiegung in Maschinenquerrichtung deutlich erhöht wird. Hat der Grundkörper keine kreisrunde Querschnittsform, sondern ist dieser bspw. elliptisch ausgebildet, so hat dieser vorzugsweise eine Querschnittsfläche die der bei kreisrunder Querschnittsform im oben angegebenen Durchmesserbereich entspricht.The hollow cylindrical body can also have a diameter in the range of 70-200 millimeters, in particular 100-150 millimeters, which, in conjunction with the increased wall thickness compared to the prior art, whose dimensional stability against deflection in the cross-machine direction is significantly increased. If the base body does not have a circular cross-sectional shape, but if it is elliptical, for example, then this preferably has a cross-sectional area which, in the case of a circular cross-sectional shape, corresponds to the above-indicated diameter range.

Vorzugsweise ist der hohlzylindrische Grundkörper durch zumindest ein metallisches Rohr mit einer ovalen, insbesondere kreisrunden oder elliptischen Querschnittsform gebildet. Hierdurch wird der Grundkörper durch ein oder mehrere Norm-Rohre, bspw. aus Edelstahl, bereitgestellt. Das zumindest eine metallische Rohr kann hierbei ein geschweißtes Rohr oder ein nahtloses Rohr sein.Preferably, the hollow cylindrical base body is formed by at least one metallic tube having an oval, in particular circular or elliptical cross-sectional shape. As a result, the basic body is provided by one or more standard pipes, for example of stainless steel. The at least one metallic tube may in this case be a welded tube or a seamless tube.

Der Grundkörper kann ferner aus einem einzigen Rohr mit der Länge des Grundkörpers gebildet sein. Denkbar ist auch, dass der Grundkörper aus mehreren Rohren geringerer Länge als der Grundkörper gebildet ist, die ihrer Länge nach in Maschinenquerrichtung orientiert hintereinander angeordnet und an ihren zueinander gewandten Stirnseiten miteinander verbunden, insbesondere miteinander verschweißt, sind.The base body can also be formed from a single tube with the length of the base body. It is also conceivable that the base body is formed of a plurality of tubes of lesser length than the base body, which are arranged in the machine transverse direction oriented one behind the other and connected to each other at their mutually facing end sides, in particular welded together, are.

Zur Bereitstellung einer definierten Strömung im Mediumverteilrohr und zur Reduktion von Ablagerungen ist es sinnvoll, wenn die radial innen liegende Mantelfläche des hohlzylindrischen Grundkörpers geschliffen und/oder poliert ist. Vorzugsweise hat die radial innen liegende Mantelfläche eine Rauigkeit im Bereich von 0,1-3,0 µm Ra, bevorzugt im Bereich von 0,2-1,6 µm Ra, besonders bevorzugt im Bereich von 0,3-0,9 µm Ra.To provide a defined flow in the medium distribution pipe and to reduce deposits, it makes sense if the radially inner circumferential surface of the hollow cylindrical base body is ground and / or polished. Preferably, the radially inner circumferential surface has a roughness in the range of 0.1-3.0 microns R a , preferably in the range of 0.2-1.6 microns R a , more preferably in the range of 0.3-0.9 μm R a .

Wie bereits vorher erwähnt, sind die Abströmkanäle vorzugsweise durch Bohrungen im hohlzylindrischen Grundkörper gebildet. Hierdurch können weiter Fertigungsauswand und Materialkosten gesenkt werden, da die Abströmkanäle nicht durch separate hohlzylindrische Hülsen bereitgestellt werden müssen. Um den Fertigungsaufwand weiter zu reduzieren ist es insbesondere von Vorteil, wenn die Bohrungen in den hohlzylindrischen Grundkörper eingebracht werden, bevor dieser geschliffen und/oder poliert wird. Hierdurch können Grate die beim Bohren entstehen gleich mit dem nachfolgenden Schleifen und/oder Polieren entfernt werden.As already mentioned above, the outflow channels are preferably formed by bores in the hollow cylindrical basic body. This can further reduce manufacturing costs and material costs, since the outflow channels do not have to be provided by separate hollow cylindrical sleeves. To continue the manufacturing effort To reduce it is particularly advantageous if the holes are introduced into the hollow cylindrical body before it is ground and / or polished. As a result, burrs that arise during drilling can be removed immediately with the subsequent grinding and / or polishing.

Die Bohrungen haben an der minimalen Querschnittsfläche vorzugsweise einen Durchmesser im Bereich von 4-15 Millimeter.The holes preferably have a diameter in the range of 4-15 millimeters at the minimum cross-sectional area.

Das Mediumverteilrohr wird in der Regel an einer seiner Stirnseiten durch zumindest eine, insbesondere eine Zuströmleitung mit dem flüssigen oder pastösen Medium versorgt. Vorzugsweise ist vorgesehen, dass die zumindest eine Zuströmleitung eine ovale, insbesondere kreisrunde oder elliptische Querschnittsform hat. Vorzugsweise hat die Zuströmleitung insbesondere die gleiche Querschnittsform wie das Mediumverteilrohr. Hierdurch kann der Übergang zwischen Mediumverteilrohr und Zuströmleitung besonders einfach gestaltet werden und weist zudem keine "toten Winkel" auf in denen sich ungewünschte Ablagerungen des Mediums ansammeln können, wie dies bspw. der Fall ist, wenn die sich Querschnittsformen von Zuströmleitung und Mediumverteilrohr voneinander unterscheiden.The Mediumverteilrohr is usually supplied at one of its end faces by at least one, in particular a Zuströmleitung with the liquid or pasty medium. It is preferably provided that the at least one inflow line has an oval, in particular circular or elliptical cross-sectional shape. Preferably, the inflow line in particular has the same cross-sectional shape as the medium distribution tube. As a result, the transition between the medium distribution pipe and the inflow pipe can be made particularly simple and also has no "blind spots" in which undesired deposits of the medium can accumulate, as is the case, for example, when the cross-sectional shapes of the inflow pipe and the medium distribution pipe differ from one another.

Weiter ist es in diesem Zusammenhang insbesondere von Vorteil, wenn die Zuströmleitung am Übergang zum Mediumverteilrohr die gleich große Querschnittsfläche und die gleiche Querschnittsform wie das Mediumverteilrohr hat. Dies ist insbesondere dann möglich, wenn sich die Querschnittsfläche der Zuströmleitung von einer vom Übergang weiter entfernten Stelle zum Übergang zum Mediumverteilrohr hin konisch erweitert oder verjüngt.Furthermore, it is particularly advantageous in this context if the inflow line at the transition to the medium distribution pipe has the same size cross-sectional area and the same cross-sectional shape as the medium distribution pipe. This is possible in particular if the cross-sectional area of the inflow line expands or tapers conically from a point further from the transition to the transition to the medium distribution tube.

Um eine in Maschinenquerrichtung gleichmäßige Ausströmung des Mediums durch die Ausströmkanäle zu erreichen ist es insbesondere sinnvoll, wenn die Summe der minimalen Querschnittsflächen der Abströmkanäle, die Wandstärke des Grundkörpers und die Summe der Querschnittsflächen des zumindest einen Zuströmkanals, insbesondere die Querschnittsfläche des stirnseitig eingeführten einen einzigen Zuströmkanals, sowie der Abstand vom in Maschinenquerrichtung ersten zum letzten Abströmkanal derart aufeinander abgestimmt sind, dass der in Maschinenquerrichtung betrachtete Druckabfall des flüssigen oder pastösen Mediums vom ersten zum letzten Abströmkanal geringer ist als der Druckabfall des flüssigen oder pastösen Mediums durch jeden der Abströmkanäle. Vorzugsweise ist hier der Abstand zwischen dem ersten und letzten Abströmkanal in Maschinenquerrichtung gleich der Bahnbreite. Ist bspw. die Bahnbreite 10 000 Millimeter, so ist der Abstand zwischen dem ersten und letzten Abströmkanal in Maschinenquerrichtung auch 10 000 Millimeter.In order to achieve a uniform outflow of the medium through the outflow channels in the cross machine direction, it is particularly useful if the sum of the minimum cross-sectional areas of the outflow channels, the wall thickness of the base body and the sum of the cross-sectional areas of the at least one inflow channel, in particular the cross-sectional area of the front side introduced a single inflow channel , And the distance from the first transverse to the last outflow in the cross machine direction are coordinated so that the considered in the cross machine direction pressure drop of the liquid or pasty medium from the first to the last outflow channel is less than the pressure drop of the liquid or pasty medium through each of the outflow channels. Preferably, the distance between the first and last discharge channel in the cross-machine direction is equal to the width of the web. Is, for example, the Web width 10 000 millimeters, so the distance between the first and last discharge channel in the cross machine direction is also 10 000 millimeters.

Denkbar ist ferner, dass die Vorrichtung zusätzlich einen Tragbalken umfasst, wobei das Mediumverteilrohr gegenüber dem Tragbalken einen Teil, z.B. zumindest 25%, insbesondere den größeren Teil, d.h. mehr als 50%, der Dimensionsstabilität bereitstellt.It is also conceivable that the device additionally comprises a support beam, wherein the medium distribution pipe opposite the support beam a part, e.g. at least 25%, in particular the larger part, i. more than 50% providing dimensional stability.

Üblicherweise umfasst die Auftragseinheit zusätzlich noch eine Egalisierungseinrichtung, mittel der das auf die Materialbahn oder Walze aufgebrachte flüssige oder pastöse Medium teilweise abgetragen und/oder vergleichmäßigt wird, um schlussendlich auf der Materialbahn, insbesondere Faserstoffbahn, eine aus dem Medium gebildete Schicht mit in Maschinenrichtung und Maschinenquerrichtung gleicher und definierter Dicke bereitzustellen.Usually, the application unit additionally comprises a leveling device, by means of which the liquid or pasty medium applied to the web or roller is partially removed and / or homogenized, finally on the material web, in particular fibrous web, a layer formed from the medium in the machine direction and cross machine direction to provide the same and defined thickness.

In vorteilhaften Ausführungen beträgt die Länge des Mediumverteilrohrs mehr als 1m, bevorzugt mehr als 2m, besonders bevorzugt mehr als 3m. In einer weiteren besonders bevorzugten Ausführung der Erfindung erstreckt sich das Mediumverteilrohr über die gesamte Maschinenquerrichtung, bzw. die gesamte Breite der Materialbahn.In advantageous embodiments, the length of the medium distribution tube is more than 1m, preferably more than 2m, more preferably more than 3m. In a further particularly preferred embodiment of the invention, the medium distribution pipe extends over the entire cross-machine direction, or the entire width of the material web.

Die Erfindung wird nachfolgend anhand einer schematischen Zeichnung weiter erläutert. Es zeigt die einzige Figur eine Auftragseinheit 2 einer erfindungsgemäßen Vorrichtung 1 zum direkten oder indirekten Auftragen eines flüssigen oder pastösen Mediums auf eine laufende Materialbahn im Querschnitt. Vorliegend erstreckt sich die Maschinenquerrichtung senkrecht zur Zeichnungsebene.The invention will be further explained with reference to a schematic drawing. The single figure shows an application unit 2 of a device 1 according to the invention for direct or indirect application of a liquid or pasty medium to a moving material web in cross-section. In the present case, the machine transverse direction extends perpendicular to the plane of the drawing.

Die Auftragseinheit 2 hat ein sich in seiner Länge in Maschinenquerrichtung der Vorrichtung erstreckendes Mediumverteilrohr 3, welches über eine Vielzahl von in Maschinenquerrichtung hintereinander angeordneten Abströmkanälen 4 mit einer sich in ihrer Länge in Maschinenquerrichtung erstreckenden Mediumaustragskammer 5 derart kommuniziert, dass das flüssige oder pastöse Medium zuerst im Mediumverteilrohr 3 in Maschinenquerrichtung verteilt und durch die Abströmkanäle 4 der Mediumaustragskammer 5 zugeführt wird, bevor dieses durch eine Austrittsöffnung 6 der Mediumaustragskammer 5 tritt und vorliegend auf die Walze 7 aufgebracht wird. Die Mediumaustragskammer 5 umfasst vorliegend eine vordere und eine hintere Lippe 8, 9 sowie einen vorderen Kammerboden 10 und einen hinteren Kammerboden 11.The applicator unit 2 has a medium distribution tube 3 extending in its length in the cross machine direction of the device, which communicates via a plurality of outflow channels 4 arranged one behind the other in the cross machine direction with a medium discharge chamber 5 extending in the cross machine direction in such a way that the liquid or pasty medium first enters the Medium distribution pipe 3 is distributed in the cross-machine direction and fed through the outflow 4 of the medium discharge chamber 5 before it passes through an outlet opening 6 of the medium discharge chamber 5 and in the present case is applied to the roller 7. The medium discharge chamber 5 here comprises a front and a rear lip 8, 9 and a front chamber bottom 10 and a rear chamber bottom 11th

Das Mediumverteilrohr 3 ist vorliegend durch einen hohlzylindrischen Grundkörper mit einer kreisrunden Querschnittsform und einer Wandstärke von 8-14 Millimeter gebildet ist.The Mediumverteilrohr 3 is presently formed by a hollow cylindrical body with a circular cross-sectional shape and a wall thickness of 8-14 millimeters.

Der hohlzylindrische Grundkörper hat einen Durchmesser im Bereich 120-150 Millimeter und ist durch ein Edelstahlrohr oder mehrere Edelstahlrohre gebildet, wobei das Edelstahlrohr oder die mehreren Edelstahlrohre nahtlos ist bzw. sind. Des Weiteren ist die radial innen liegende Mantelfläche des Edelstahlrohrs oder der Edelstahlrohre auf eine Rauigkeit von 0,4-0,7 µm Ra geschliffen und/oder poliert.The hollow cylindrical body has a diameter in the range 120-150 millimeters and is formed by a stainless steel tube or more stainless steel tubes, the stainless steel tube or the plurality of stainless steel tubes is seamless or are. Furthermore, the radially inner surface of the stainless steel tube or stainless steel tubes is ground to a roughness of 0.4-0.7 microns Ra and / or polished.

Wie zu erkennen ist, sind die Abströmkanäle 4 durch Bohrungen im hohlzylindrischen Grundkörper 3 gebildet.As can be seen, the outflow channels 4 are formed by bores in the hollow cylindrical basic body 3.

Die Länge des Mediumverteilrohrs 3 in Maschinenquerrichtung beträgt üblicherweise mehr als 1m. Bei modernen Anlagen kann diese Länge auch deutlich darüber liegen, z.B. mehr als 2m, bis hin zu 10m oder mehr. Gerade bei derart großen Längen des Medienverteilrohrs wird der hohlzylindrische Grundkörper oft durch mehrere Rohre, speziell Edelstahlrohre gebildet, welche z.B. durch Schweißen miteinander verbunden sind. Hier ist es vorteilhaft, wenn die gesamte radial innen liegende Mantelfläche des hohlzylindrischen Grundkörpers, insbesondere auch im Bereich der Verbindungsstellen der Rohre eine Rauigkeit im Bereich von 0,1-3,0 µm Ra, insbesondere im Bereich von 0,3-0,9 µm Ra hat.The length of the medium distribution pipe 3 in the cross machine direction is usually more than 1 m. In modern plants, this length may also be significantly higher, e.g. more than 2m, up to 10m or more. Especially with such large lengths of the media distribution pipe, the hollow cylindrical body is often formed by a plurality of pipes, especially stainless steel pipes, which are e.g. are joined together by welding. Here, it is advantageous if the entire radially inner circumferential surface of the hollow cylindrical base body, in particular in the region of the connection points of the tubes roughness in the range of 0.1-3.0 microns Ra, in particular in the range of 0.3-0.9 μm Ra has.

Claims (15)

  1. Device for the direct or indirect application of a liquid or pasty medium to a moving material web, in particular a fibrous web such as a paper, board or tissue web, having at least one application unit by means of which the liquid or pasty medium can be applied to a roll or the material web, and the application unit has a medium distribution pipe, the length of which extends in the cross-machine direction of the device and which, via a multiplicity of outflow channels arranged one after another in the cross-machine direction, communicates with a medium discharge chamber, the length of which extends in the cross-machine direction, in such a way that the liquid or pasty medium is first distributed in the cross-machine direction in the medium distribution pipe and is fed to the medium discharge chamber through the outflow channels, before the said medium emerges through an outlet opening of the medium discharge chamber and is applied to the roll or material web, characterized in that the medium distribution pipe is formed by a hollow cylindrical base body having an oval, in particular circular or elliptical, cross-sectional shape and a wall thickness of 3 mm or more.
  2. Device according to Claim 1, characterized in that the hollow cylindrical base body has a wall thickness in the range from 4-25 mm, preferably 8-20 mm.
  3. Device according to Claim 1 or 2, characterized in that the hollow cylindrical base body has a diameter in the range from 70-200 mm, in particular 100-150 mm.
  4. Device according to one of Claims 1 to 3, characterized in that the hollow cylindrical base body is formed by at least one metallic pipe having an oval, in particular circular or elliptical, cross-sectional shape.
  5. Device according to one of Claims 1 to 4, characterized in that the at least one metallic pipe is a welded pipe or a seamless pipe.
  6. Device according to one of Claims 1 to 5, characterized in that the radially inner circumferential surface of the hollow cylindrical base body is ground and/or polished.
  7. Device according to Claim 6, characterized in that the radially inner circumferential surface has a roughness in the range from 0.1-3.0 µm Ra, in particular in the range from 0.3-0.9 µm Ra.
  8. Device according to one of Claims 1 to 7, characterized in that the outflow channels are formed by bores in the hollow cylindrical base body.
  9. Device according to one of Claims 1 to 8, characterized in that the medium distribution pipe is supplied with the liquid or pasty medium at one of its ends by a feed line, which medium distribution pipe has an oval, in particular circular or elliptical, cross-sectional shape.
  10. Device according to Claim 9, characterized in that the feed line has an equally large cross-sectional area at the transition distance to the medium distribution pipe and the same cross-sectional shape as the medium distribution pipe, and the cross-sectional area of the feed line widens or tapers conically, in particular from a point further removed from the transition to the transition.
  11. Device according to one of Claims 1 to 10, characterized in that the sum of the minimum cross-sectional areas of the outflow channels, the wall thickness of the base body and the cross-sectional area of the feed channel and the distance from the first to last outflow channel in the cross-machine direction are matched to one another in such a way that the pressure drop of the liquid or pasty medium from the first to the last outflow channel, considered in the cross-machine direction, is lower than the pressure drop of the liquid or pasty medium through each of the outflow channels.
  12. Device according to one of Claims 1 to 11, characterized in that the base body is formed from multiple pipes of a shorter length than the base body, which are arranged to be oriented one after another with their length in the cross-machine direction and are connected to one another, in particular welded to one another, at their mutually facing ends.
  13. Device according to one of Claims 1 to 12, characterized in that the wall thickness of the medium distribution pipe and its length are matched to each other in such a way that the dimensional stability of the application unit with respect to deflection along the cross-machine direction is provided substantially by the medium distribution pipe.
  14. Device according to one of Claims 1 to 13, characterized in that the device additionally comprises a supporting beam, wherein, as compared with the supporting beam, the medium distribution pipe provides at least 25%, in particular the greater part, i.e. more than 50%, of the dimensional stability.
  15. Device according to one of Claims 1 to 14, characterized in that the application unit additionally comprises an equalization device for the partial removal and/or for equalization of the liquid or pasty medium applied to the material web or roll.
EP15753634.3A 2014-08-15 2015-08-04 Coating device Active EP3180475B2 (en)

Applications Claiming Priority (2)

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DE102014216256 2014-08-15
PCT/EP2015/067917 WO2016023791A1 (en) 2014-08-15 2015-08-04 Coater

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EP3180475B1 true EP3180475B1 (en) 2018-10-10
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DE1810599A1 (en) 1967-12-18 1969-09-18 Black Clawson Co Fountain coater
DE3046960C2 (en) 1979-12-17 1984-07-19 Aktiebolaget Karlstads Mekaniska Werkstad, Karlstad Flow distributor for generating a liquid film
US4534309A (en) 1983-11-17 1985-08-13 Consolidated Papers, Inc. Paper coating apparatus
EP0536649A1 (en) 1991-10-10 1993-04-14 J.M. Voith GmbH Apparatus for applying a coating colour onto a fibrous web
DE69323214T2 (en) 1992-09-11 1999-09-09 Consolidated Papers Inc. DEVICE AND METHOD FOR MINIMIZING COATING GAPS ON A PAPER RAIL
DE4432178A1 (en) 1994-09-09 1996-03-14 Voith Gmbh J M Machine for direct or indirect coating of fluid or paste mediums onto running material web
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US20130273253A1 (en) 2012-04-17 2013-10-17 Fujifilm Corporation Coating apparatus and method of manufacturing coated film

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EP3180475B2 (en) 2021-11-03
CN107073504A (en) 2017-08-18
EP3180475A1 (en) 2017-06-21
WO2016023791A1 (en) 2016-02-18

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