EP1284164B1 - Process and apparatus for coating with a melted product - Google Patents

Process and apparatus for coating with a melted product Download PDF

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Publication number
EP1284164B1
EP1284164B1 EP02017471A EP02017471A EP1284164B1 EP 1284164 B1 EP1284164 B1 EP 1284164B1 EP 02017471 A EP02017471 A EP 02017471A EP 02017471 A EP02017471 A EP 02017471A EP 1284164 B1 EP1284164 B1 EP 1284164B1
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EP
European Patent Office
Prior art keywords
roller
coating
strip
jacket
substrate
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Expired - Lifetime
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EP02017471A
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German (de)
French (fr)
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EP1284164A1 (en
Inventor
Peter Dipl.-Ing. Knupfer
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Inductotherm Coating Equipment SA
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Inductotherm Coating Equipment SA
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • 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
    • B05C1/0856—Reverse coating rollers
    • 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
    • B05C1/10—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 liquid or other fluent material being supplied from inside the roller
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/28—Processes for applying liquids or other fluent materials performed by transfer from the surfaces of elements carrying the liquid or other fluent material, e.g. brushes, pads, rollers
    • 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
    • B05C9/04—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 liquid or other fluent material to opposite sides of the work

Definitions

  • the invention relates to a method for applying a metallic or inorganic coating to a sheet-like material, wherein the material of the coating is applied in the molten state by means of at least one rotating roller, solidified by cooling and connects to the substrate, wherein at least on a portion of the jacket the roller is formed a film of the material of the coating and the substrate is guided at a distance relative to the roller, that in a contact region, the material of the coating continuously flows from the roller to the surface of the substrate and a device for applying a metallic or inorganic coating on a web-shaped material, wherein the material of the coating in the molten state by means of at least one rotatable roller can be applied, after which it solidifies by cooling and connects to the web-shaped Good, wherein at least on a portion of Mantels a film of the material of the coating can be produced and the web-like material is feasible at such a distance from the roller, that in a contact region, the material of the coating continuously flows from the shell of the roller on the web-shaped
  • Methods and apparatus for coating a substrate with molten material are used for surface treatment, environmental protection, or generally to combine properties of two materials - the substrate and the coating.
  • Coating with metallic or inorganic melts in contrast to the application of lacquers or plastic coatings, places entirely different demands on the process technology as well as on the materials used. Examples of application are the galvanizing or tinning of steel sheets, but also the coating of window glass with solar grade silicon.
  • Such dipping methods are characterized by a very high use amount of the material used for the coating in relation to the thickness of the desired coating, since the immersed components or strips must pass completely under the surface of the melt at least once.
  • the large quantities used resulted in large dimensions of the immersion baths, high energy and insulation costs and - especially when using high-quality materials for coating - a high capital commitment.
  • undesired deposits form, which can adversely affect the quality of the coating.
  • when coating metal sheets with dipping processes basically both sides are always coated. A single side coating or different coatings on both sides are not possible.
  • Document DE-A1-4412585 discloses an apparatus for applying a coating (lubricant) to a sheet-like material in a molten state.
  • the device has a rotatable roller with an inner cavity with openings through which the molten coating composition can be acted upon.
  • the object of the invention is to propose a further method and a device for molten coating, by means of which the size of the generic device can be significantly reduced.
  • this object is achieved according to the invention in that the liquid material of the coating is conveyed from an inner cavity of a roller through openings on the shell of the roller.
  • a roller of a device according to the invention has an inner cavity which can be acted upon by pressurized liquid material of the coating and is provided with openings for an escape of the liquid material from the cavity onto the casing.
  • the invention leads to structurally surprisingly simple solutions and compact designs. Also different coatings of both sides are possible.
  • the amount of material remaining in the system of the coating can advantageously - albeit with increased manufacturing costs - be reduced if the openings on the shell of the roller are connected individually via substantially radially extending channels with an axially extending inside the roller pressure line. By reducing the diameter of this pressure line and the channels, the void volume of the roller and thus the amount of material used is significantly reduced.
  • the invention then leads to a method which is particularly easy to handle when the roller is mounted in a stationary manner and the web-shaped material is moved past it in its longitudinal direction relative to the stationary roller. Moreover, if the web-like material is moved substantially vertically upward in the contact region, the acceleration due to gravity promotes the formation of a film of the material of the coating on the upper side of the roll.
  • a roller is movable in a direction having a component perpendicular to the surface of the web-shaped Guts, By adjusting the distance between the roller and substrate different flow properties of the material of the coating can be considered.
  • the coating can be very easily interrupted by removing the roller from the substrate and resumed at a later point by re-delivery. If the roller is movably mounted in its axial direction, the application point of the coating on the substrate can be varied without significant effort. In the case of a band, it is therefore possible to produce coatings with, for example, half the width of the band.
  • the invention is used particularly advantageously in the coating of metallic strips, in the coating with metals, or when the melting point of the coating is less than the melting point of the substrate.
  • a roller of the device according to the invention can be made heatable to prevent premature solidification of the material of the coating.
  • the shell of the roll can be actively heated over part of its circumference before entering the contact area from the outside.
  • the above-described formation of radial channels in the roller also allows a reduction of the external dimensions of the generic device by the arrangement of additional heating elements within the roller.
  • the substrate can be actively heated from the outside before entering the contact area and, if necessary, subjected to protective gas.
  • the flow of material from the shell of the roll to the surface of the substrate is then to be adjusted particularly well when, in the contact region, the directions of movement of the surface to be coated and of the shell of the roll are opposite to one another.
  • a collecting device in the direction of gravity below the roller, which captures the remaining material of the coating on the roller and allows recycling via a treatment in a circuit.
  • the openings leading to the surface of the roller are arranged in grooves in the casing, which run helically with constant pitch or perpendicular to the longitudinal axis of the roller circumferentially and equidistantly.
  • a uniform distribution of the material of the coating on the surface of the roller is achieved.
  • a device 1 according to FIG. 1 for double-sided coating of a web-shaped substrate 2 in the form of a steel strip with a metallic material, for example a zinc alloy, comprises two oppositely arranged devices 3 a and 3 b for respectively one-sided coating, between which the substrate 2 is continuous in one Direction 4 is guided vertically upwards. Before entering the device 1, the substrate 2 passes through an inductive heater 5.
  • the devices 3a and 3b each comprise a roller 6, a collecting device 7 arranged underneath, and a housing 8 comprising both.
  • the roller 6 dips into a bath 9 formed by the liquid material of the coating.
  • the devices 3a and 3b can be easily adapted to different properties of the substrate 2, the metallic liquid and the desired thickness of the coating , By increasing the distance between substrate 2 and roller 6 in the radial direction 18 also interruptions of the coating can be performed.

Landscapes

  • Coating Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Coating With Molten Metal (AREA)

Abstract

Process for applying a coating to a strip-like material (2) comprises: applying the coating material in its molten state using a rotating roller (6); solidifying by cooling; and joining to a substrate. A film of material is formed on a section of the casing (13) of the roller and the substrate is guided relative to the roller so that the coating material continuously flows from the roller onto the surface of the substrate. The coating material is conveyed from an inner hollow chamber of the roller through passages on the casing of the roller. An Independent claim is also included for a device for applying a coating to a strip-like material. Preferred Features: The strip-like material is a metallic strip and the coating material is a metal. The melting point of the coating is less than the melting point of the strip-like material.

Description

Die Erfindung betrifft ein Verfahren zum Aufbringen einer metallischen oder anorganischen Beschichtung auf ein bahnförmiges Gut, wobei das Material der Beschichtung im schmelzflüssigen Zustand mittels mindestens einer rotierenden Walze aufgebracht wird, durch Abkühlen erstarrt und sich mit dem Substrat verbindet, wobei mindestens auf einem Abschnitt des Mantels der Walze ein Film des Materials der Beschichtung erzeugt wird und das Substrat in einem solchen Abstand relativ zu der Walze geführt wird, dass in einem Kontaktbereich das Material der Beschichtung kontinuierlich von der Walze auf die Oberfläche des Substrats fließt sowie eine Vorrichtung zum Aufbringen einer metallischen oder anorganischen Beschichtung auf ein bahnförmiges Gut, wobei das Material der Beschichtung in schmelzflüssigem Zustand mittels mindestens einer rotierbaren Walze aufbringbar ist, wonach es durch Abkühlen erstarrt und sich mit dem bahnförmigen Gut verbindet, wobei mindestens auf einem Abschnitt des Mantels ein Film des Materials der Beschichtung erzeugbar ist und das bahnförmige Gut in einem solchen Abstand zu der Walze führbar ist, dass in einem Kontaktbereich das Material der Beschichtung kontinuierlich von dem Mantel der Walze auf das bahnförmige Gut fließt.The invention relates to a method for applying a metallic or inorganic coating to a sheet-like material, wherein the material of the coating is applied in the molten state by means of at least one rotating roller, solidified by cooling and connects to the substrate, wherein at least on a portion of the jacket the roller is formed a film of the material of the coating and the substrate is guided at a distance relative to the roller, that in a contact region, the material of the coating continuously flows from the roller to the surface of the substrate and a device for applying a metallic or inorganic coating on a web-shaped material, wherein the material of the coating in the molten state by means of at least one rotatable roller can be applied, after which it solidifies by cooling and connects to the web-shaped Good, wherein at least on a portion of Mantels a film of the material of the coating can be produced and the web-like material is feasible at such a distance from the roller, that in a contact region, the material of the coating continuously flows from the shell of the roller on the web-shaped material.

Verfahren und Vorrichtungen zur Beschichtung eines Substrats mit schmelzflüssigem Material werden eingesetzt zur Oberflächenvergütung, zum Schutz gegen Umwelteinflüsse oder allgemein um Eigenschaften zweier Materialien - des Substrats und der Beschichtung - zu kombinieren. Die Beschichtung mit metallischen oder anorganischen Schmelzen stellt im Gegensatz zum Aufbringen von Lacken oder Kunststoffbeschichtungen völlig andere Anforderungen an die Verfahrenstechnik wie auch an die verwendeten Materialien. Anwendungsbeispiele sind das Verzinken oder Verzinnen von Stahlblechen, aber auch das Beschichten von Fensterglas mit Solarsilizium.Methods and apparatus for coating a substrate with molten material are used for surface treatment, environmental protection, or generally to combine properties of two materials - the substrate and the coating. Coating with metallic or inorganic melts, in contrast to the application of lacquers or plastic coatings, places entirely different demands on the process technology as well as on the materials used. Examples of application are the galvanizing or tinning of steel sheets, but also the coating of window glass with solar grade silicon.

Allgemein bekannt sind Verfahren und Vorrichtungen zum schmelzflüssigen Beschichten, bei denen bandförmige Metallbleche kontinuierlich durch ein stehendes Bad einer metallischen Schmelze geführt oder Formteile aus Stahlblechen, zum Beispiel Karosserieteile einzeln in ein solches Bad getaucht werden. Die beim Herausführen eines Bandes oder beim Herausnehmen eines Formteiles aus dem Bad anhaftende Schmelze bildet nach Abkühlung und Erstarrung die Beschichtung.Well-known methods and devices for molten coating, in which strip-shaped metal sheets are continuously passed through a standing bath of a metallic melt or molded parts made of steel sheets, for example, body parts are immersed individually in such a bath. The melt adhering to the strip when removing a strip or removing a molded part from the bath forms the coating after cooling and solidification.

Derartige Tauchverfahren zeichnen sich durch eine im Verhältnis zur Dicke der gewünschten Beschichtung sehr hohe Einsatzmenge des zur Beschichtung verwendeten Materials aus, da die eingetauchten Bauteile oder Bänder mindestens einmal vollständig unter die Oberfläche der Schmelze gelangen müssen. Aus den großen Einsatzmengen resultierten große Abmessungen der Tauchbäder, hohe Energie- und Isolationsaufwände und - gerade bei der Verwendung hochwertiger Materialien zur Beschichtung - eine hohe Kapitalbindung. Zudem bilden sich in Tauchbädern mit metallischen Schmelzen unerwünschte Ablagerungen, die die Qualität der Beschichtung negativ beeinflussen können. Darüber hinaus werden bei der Beschichtung von Blechen mit Tauchverfahren grundsätzlich immer beide Seiten beschichtet. Eine Beschichtung einer einzelnen Seite oder auch unterschiedliche Beschichtungen auf beiden Seiten sind nicht möglich.Such dipping methods are characterized by a very high use amount of the material used for the coating in relation to the thickness of the desired coating, since the immersed components or strips must pass completely under the surface of the melt at least once. The large quantities used resulted in large dimensions of the immersion baths, high energy and insulation costs and - especially when using high-quality materials for coating - a high capital commitment. In addition, in immersion baths with metallic melts, undesired deposits form, which can adversely affect the quality of the coating. In addition, when coating metal sheets with dipping processes, basically both sides are always coated. A single side coating or different coatings on both sides are not possible.

Dokument DE-A1-4412585 offenbart eine Vorrichtung zum Aufbringen einer Beschichtung (Schmiermittel) auf ein bahnförmiges Gut in schmelzflüssigem Zustand. Die Vorrichtung weist eine rotierbare Walze mit einem inneren Hohlraum mit Durchbrüchen auf, durch die das schmelzflüssige Beschichtungsmittel beaufschlagbar ist.Document DE-A1-4412585 discloses an apparatus for applying a coating (lubricant) to a sheet-like material in a molten state. The device has a rotatable roller with an inner cavity with openings through which the molten coating composition can be acted upon.

Nach dem in der deutschen Patentschrift DE 44 28 741 beschriebenen Verfahren wird eine schmelzflüssige Beschichtung auf ein Substrat aufgegossen. Mittels einer Vorrichtung wird lokal begrenzt über der Aufgießstelle ein Fluss des Materials der Beschichtung erzeugt, der die Bildung unerwünschter Ablagerungen verhindert. Beim Abziehen des Substrates aus der Vorrichtung heraus haftet eine dünne Schicht des aufgebrachten Materials an dem Substrat und bildet nach Erstarrung eine Beschichtung. Dieses Verfahren ermöglicht gegenüber Tauchverfahren bereits eine deutliche Reduzierung des Einsatzmaterials. Auch die Beschichtung einer einzelnen Seite eines bandförmigen Guts oder unterschiedliche Beschichtungen beider Seiten sind so möglich.After the process described in German Patent DE 44 28 741 a molten coating is poured onto a substrate. By means of a device, a flow of the material of the coating is generated locally limited over the pouring point, which prevents the formation of undesirable deposits. When the substrate is removed from the device, a thin layer of the applied material adheres to the substrate and forms a coating after solidification. This process already allows a significant reduction of the feed material compared to dipping processes. The coating of a single side of a band-shaped Guts or different coatings on both sides are possible.

Gattungsgemäße Verfahren und Vorrichtungen nach den Oberbegriffen der unabhängigen Ansprüche ermöglichen auf einfache Weise durch Zustell- und Rückzugsbewegungen des bahnförmigen Guts oder einer Walze darüber hinaus eine kurzfristige Unterbrechung des Beschichtungsvorgangs oder den kurzfristigen Wechsel des Beschichtungsmaterials. Ein gattungsgemäßes Verfahren und eine Vorrichtung zur Aufbringung einer Beschichtung aus einer Metallschmelze beschreibt die DE 29 21 124 Al. Die Vorrichtung weist zwei Beschichtungsstationen auf, deren Beschichtungswalzen horizontal auf verschiedenen Seiten einer Durchlaufstrecke für ein Band angeordnet sind. Zur wahlweisen Beschichtung des Bandes auf einer, beiden oder keiner Seite sind die Beschichtungsstationen und/oder die Umlenkwalzen quer zur Bandoberfläche verschiebbar. Gemäß den Ausführungsbeispielen dieser Schrift wird das Material der Beschichtung mittels jeweils einer Sekundärwalze auf die Beschichtungswalzen übertragen.Generic methods and devices according to the preambles of the independent claims allow in a simple way by advancing and retracting movements of the web-shaped Guts or a roller beyond a short-term interruption of the coating process or the short-term change of the coating material. A generic method and apparatus for applying a coating from a molten metal is described in DE 29 21 124 Al. The apparatus has two coating stations, the coating rollers of which are arranged horizontally on different sides of a conveyor belt passage. For optional coating of the tape on one, two or neither side, the coating stations and / or the guide rollers are displaceable transversely to the belt surface. According to the embodiments In this document, the material of the coating is transferred to the coating rollers by means of a respective secondary roller.

Aufgabe der Erfindung ist es, ein weiteres Verfahren und eine Vorrichtung zum schmelzflüssigen Beschichten vorzuschlagen, mittels derer die Baugröße der gattungsgemäßen Vorrichtung deutlich reduziert werden kann.The object of the invention is to propose a further method and a device for molten coating, by means of which the size of the generic device can be significantly reduced.

Ausgehend von dem gattungsgemäßen Verfahren wird diese Aufgabe nach der Erfindung dadurch gelöst, dass das flüssige Material der Beschichtung aus einem inneren Hohlraum einer Walze durch Durchbrüche auf den Mantel der Walze gefördert wird. Ausgehend von der gattungsgemäßen Vorrichtung weist eine Walze einer erfindungsgemäßen Vorrichtung einen inneren Hohlraum auf, der mit unter Druck stehendem flüssigen Material der Beschichtung beaufschlagbar ist und ist mit Durchbrüchen für einen Austritt des flüssigen Materials aus dem Hohlraum auf den Mantel versehen. Die Erfindung führt zu konstruktiv überraschend einfachen Lösungen und kompakten Bauformen. Auch unterschiedliche Beschichtungen beider Seiten sind möglich.Based on the generic method, this object is achieved according to the invention in that the liquid material of the coating is conveyed from an inner cavity of a roller through openings on the shell of the roller. Starting from the generic device, a roller of a device according to the invention has an inner cavity which can be acted upon by pressurized liquid material of the coating and is provided with openings for an escape of the liquid material from the cavity onto the casing. The invention leads to structurally surprisingly simple solutions and compact designs. Also different coatings of both sides are possible.

Mittels der aus dem inneren Hohlraum der Walze an die Oberfläche führenden Durchbrüche, durch die das flüssige Material auf den Mantel austreten kann, können zum einen Energieverluste durch abstrahlende Wärme wirksam reduziert werden. Zum andern wird die Wärme des Materials der Beschichtung zur Aufheizung der Walze ausgenutzt.By means of the leading from the inner cavity of the roller to the surface breakthroughs through which the liquid material can escape to the jacket, on the one hand energy losses can be effectively reduced by radiating heat. On the other hand, the heat of the material of the coating is utilized for heating the roller.

Besonders einfach können solche Durchbrüche gestaltet werden, wenn die Walze als Stahlblechzylinder ausgeführt ist. Als nachteilig erweist sich hier der große innere Durchmesser der Walze, der nahezu dem äußeren Durchmesser entspricht, da ein gleichmäßiges Austreten des flüssigen Materials der Beschichtung über dem gesamten Umfang des Mantels eine vollständige Füllung des Hohlraums erfordert.Particularly simple such breakthroughs can be designed when the roller is designed as a sheet steel cylinder. A disadvantage here proves the large inner diameter of the roller, which corresponds almost to the outer diameter, since a uniform emergence of the liquid material of the coating over the entire circumference of the shell requires a complete filling of the cavity.

Die im System verbleibende Einsatzmenge des Materials der Beschichtung kann vorteilhaft - wenn auch mit erhöhtem Fertigungsaufwand - reduziert werden, wenn die Durchbrüche auf dem Mantel der Walze einzeln über im Wesentlichen radial verlaufende Kanäle mit einer axial im Innern der Walze verlaufenden Druckleitung verbunden sind. Durch eine Reduzierung der Durchmesser dieser Druckleitung und der Kanäle wird das Leervolumen der Walze und damit die Einsatzmenge des Materials signifikant reduziert.The amount of material remaining in the system of the coating can advantageously - albeit with increased manufacturing costs - be reduced if the openings on the shell of the roller are connected individually via substantially radially extending channels with an axially extending inside the roller pressure line. By reducing the diameter of this pressure line and the channels, the void volume of the roller and thus the amount of material used is significantly reduced.

Die Erfindung führt dann zu einem besonders einfach handhabbaren Verfahren, wenn die Walze ortsfest montiert ist und das bahnförmige Gut in seiner Längsrichtung relativ zu der ortsfesten Walze an dieser vorbei bewegt wird. Wird das bahnförmige Gut darüber hinaus im Kontaktbereich im Wesentlichen vertikal aufwärts bewegt, so unterstützt die Erdbeschleunigung die Ausbildung eines Films des Materials der Beschichtung auf der Oberseite der Walze.The invention then leads to a method which is particularly easy to handle when the roller is mounted in a stationary manner and the web-shaped material is moved past it in its longitudinal direction relative to the stationary roller. Moreover, if the web-like material is moved substantially vertically upward in the contact region, the acceleration due to gravity promotes the formation of a film of the material of the coating on the upper side of the roll.

In einer besonders vorteilhaften Ausführungsform einer erfindungsgemäßen Vorrichtung ist eine Walze in eine Richtung bewegbar, die eine Komponente senkrecht zu der Oberfläche des bahnförmigen Guts besitzt, Durch die Einstellung des Abstandes zwischen Walze und Substrat können unterschiedliche Fließeigenschaften des Materials der Beschichtung berücksichtigt werden. Darüber hinaus kann die Beschichtung durch Entfernen der Walze vom Substrat sehr einfach unterbrochen und an einer späteren Stelle durch erneutes Zustellen wieder aufgenommen werden. Wird die Walze in ihrer Achsrichtung beweglich gelagert, so kann die Aufbringstelle der Beschichtung auf das Substrat ohne nennenswerten Aufwand variiert werden. Bei einem Band lassen sich somit Beschichtungen mit beispielsweise der halben Breite des Bandes herstellen.In a particularly advantageous embodiment of a device according to the invention, a roller is movable in a direction having a component perpendicular to the surface of the web-shaped Guts, By adjusting the distance between the roller and substrate different flow properties of the material of the coating can be considered. In addition, the coating can be very easily interrupted by removing the roller from the substrate and resumed at a later point by re-delivery. If the roller is movably mounted in its axial direction, the application point of the coating on the substrate can be varied without significant effort. In the case of a band, it is therefore possible to produce coatings with, for example, half the width of the band.

Die Erfindung wird besonders vorteilhaft eingesetzt bei der Beschichtung metallischer Bänder, bei der Beschichtung mit Metallen, oder wenn der Schmelzpunkt der Beschichtung kleiner ist als der Schmelzpunkt des Substrats.The invention is used particularly advantageously in the coating of metallic strips, in the coating with metals, or when the melting point of the coating is less than the melting point of the substrate.

In einer Ausführungsform kann eine Walze der erfindungsgemäßen Vorrichtung beheizbar gestaltet werden um einem vorzeitigen Erstarren des Materials der Beschichtung vorzubeugen. Der Mantel der Walze kann über einen Teil seines Umfangs vor dem Eintreten in den Kontaktbereich von außen aktiv erhitzt werden. Die oben beschriebene Ausformung von radialen Kanälen in der Walze ermöglicht auch hier eine Reduzierung der äußeren Abmessungen der gattungsgemäßen Vorrichtung durch die Anordnung zusätzlicher Heizelemente innerhalb der Walze. Auch das Substrat kann vor dem Eintreten in den Kontaktbereich von außen aktiv erhitzt und erforderlichenfalls mit Schutzgas beaufschlagt werden.In one embodiment, a roller of the device according to the invention can be made heatable to prevent premature solidification of the material of the coating. The shell of the roll can be actively heated over part of its circumference before entering the contact area from the outside. The above-described formation of radial channels in the roller also allows a reduction of the external dimensions of the generic device by the arrangement of additional heating elements within the roller. Also, the substrate can be actively heated from the outside before entering the contact area and, if necessary, subjected to protective gas.

Der Materialstrom vom Mantel der Walze auf die Oberfläche des Substrats ist dann besonders gut einzustellen, wenn im Kontaktbereich die Bewegungsrichtungen der zu beschichtenden Oberfläche und des Mantels der Walze einander entgegengesetzt sind.The flow of material from the shell of the roll to the surface of the substrate is then to be adjusted particularly well when, in the contact region, the directions of movement of the surface to be coated and of the shell of the roll are opposite to one another.

Weiterhin ist vorgesehen, in Schwerkraftrichtung unterhalb der Walze eine Auffangeinrichtung anzuordnen, der das auf der Walze verbliebene Material der Beschichtung auffängt und über eine Aufbereitung die Rückführung in einen Kreislauf ermöglicht. Durch die Kombination einer Walze mit einer Auffangeinrichtung und die Kapselung innerhalb eines gemeinsamen Gehäuses können Verunreinigungen des eingesetzten Materials der Beschichtung wie auch Energieverluste durch abstrahlende Wärme deutlich reduziert werden. Bei der Beschichtung eines bahnförmigen Gutes kann die Führung des bahnförmigen Guts durch zwei schlitzförmige Öffnungen leicht in ein solches Gehäuse integriert werden, wodurch störende Einflüsse wiederum leichter kontrollierbar werden.Furthermore, it is provided to arrange a collecting device in the direction of gravity below the roller, which captures the remaining material of the coating on the roller and allows recycling via a treatment in a circuit. By combining a roller with a collecting device and the encapsulation within a common housing contaminants of the material used of the coating as well as energy losses can be significantly reduced by radiating heat. When coating a web-like material, the leadership of the web-shaped Guts can be easily integrated into two such slot-shaped openings in such a housing, which disturbing influences in turn are easier to control.

Vorteilhaft ist es, wenn die an die Oberfläche der Walze führenden Durchbrüche in Nuten im Mantel angeordnet sind, die wendelförmig mit konstanter Steigung oder senkrecht zur Längsachse der Walze umlaufend und äquidistant verlaufen. So wird eine gleichmäßige Verteilung des Materials der Beschichtung auf der Oberfläche der Walze erreicht.It is advantageous if the openings leading to the surface of the roller are arranged in grooves in the casing, which run helically with constant pitch or perpendicular to the longitudinal axis of the roller circumferentially and equidistantly. Thus, a uniform distribution of the material of the coating on the surface of the roller is achieved.

Nachfolgend wird die Erfindung anhand eines Ausführungsbeispiels, das in einer schematischen Skizze und zwei Detailansichten dargestellt ist, erläutert. Es zeigt

Fig. 1
einen axialen Schnitt einer erfindungsgemäßen Vorrichtung mit zwei gegenläufigen Walzen zur beidseitigen Beschichtung eines bandförmigen Substrats,
Fig. 2
eine Walze mit umlaufenden Nuten, einer zugeordneten Versorgungseinrichtung und einem Auffangbehälter in einer Ansicht auf die Längsachse der Walze und
Fig. 3
eine perspektivische Ansicht einer Walze mit dem zugeordneten Auffangbehälter.
The invention will be explained with reference to an embodiment which is shown in a schematic sketch and two detailed views. It shows
Fig. 1
an axial section of a device according to the invention with two counter-rotating rollers for coating both sides of a strip-shaped substrate,
Fig. 2
a roller with circumferential grooves, an associated supply device and a collecting container in a view on the longitudinal axis of the roller and
Fig. 3
a perspective view of a roller with the associated receptacle.

Eine Vorrichtung 1 nach Figur 1 zur beidseitigen Beschichtung eines bahnförmigen Substrats 2 in Form eines Stahlbandes mit einem metallischen Material, zum Beispiel einer Zinklegierung, umfasst zwei einander gegenüberliegend angeordnete Vorrichtungen 3a und 3b zur jeweils einseitigen Beschichtung, zwischen denen das Substrat 2 kontinuierlich in einer Richtung 4 vertikal nach oben geführt wird. Vor dem Eintritt in die Vorrichtung 1 durchläuft das Substrat 2 eine induktive Heizung 5.A device 1 according to FIG. 1 for double-sided coating of a web-shaped substrate 2 in the form of a steel strip with a metallic material, for example a zinc alloy, comprises two oppositely arranged devices 3 a and 3 b for respectively one-sided coating, between which the substrate 2 is continuous in one Direction 4 is guided vertically upwards. Before entering the device 1, the substrate 2 passes through an inductive heater 5.

Die Vorrichtungen 3a und 3b umfassen jeweils eine Walze 6, eine darunter angeordnete Auffangeinrichtung 7 und ein beide umfassendes Gehäuse 8. Im Auffangbehälter 7 taucht die Walze 6 in ein durch das flüssige Material der Beschichtung gebildetes Bad 9.The devices 3a and 3b each comprise a roller 6, a collecting device 7 arranged underneath, and a housing 8 comprising both. In the collecting container 7, the roller 6 dips into a bath 9 formed by the liquid material of the coating.

Zusätzlich fördert eine in axialer Richtung der Walze 6 seitlich an der Auffangeinrichtung 7 angeordnete Pumpe 10 nach Figur 2 das Material der Beschichtung aus dem Bad 9 in einen (nicht dargestellten) inneren Hohlraum der Walze 6. Von hier dringt das Material der Beschichtung durch in umlaufenden Nuten 11a oder 11b angeordnete Durchbrüche 12 auf die Oberfläche 13 der Walze 6. Die Nuten 11a und 11b stellen alternative Ausführungsformen dar, die zweckmäßiger Weise jeweils die Walzenoberfläche insgesamt betreffen.In addition, promotes a arranged in the axial direction of the roller 6 side of the catcher 7 pump 10 of Figure 2, the material of the coating from the bath 9 in a (not shown) inner cavity of the roller 6. From here penetrates the material of the coating by in circumferential Grooves 11a or 11b arranged openings 12 on the surface 13 of the roller 6. The grooves 11a and 11b represent alternative embodiments, which expediently relate respectively to the roll surface as a whole.

Durch die Rotation 14 der Walze 6 entgegen der Bewegungsrichtung 4 des Substrats 2 bildet sich oberhalb der Achsebene 15 der Walzen 6 ein Kontaktbereich 16, in dem das Material der Beschichtung von der Oberfläche 13 der Walze 6 auf das Substrat 2 übertritt.By the rotation 14 of the roller 6 counter to the direction of movement 4 of the substrate 2 is formed above the axial plane 15 of the rollers 6, a contact region 16 in which the material of the coating from the surface 13 of the roller 6 on the substrate 2 passes.

Durch eine Verstellung der Walze 6 nach Figur 3 in der Achsebene 15 sowohl in axialer Richtung 17 als auch in radialer Richtung 18 können die Vorrichtungen 3a und 3b leicht an unterschiedliche Eigenschaften des Substrats 2, der metallischen Flüssigkeit und an die gewünschte Dicke der Beschichtung angepasst werden. Durch Vergrößern des Abstandes zwischen Substrat 2 und Walze 6 in radialer Richtung 18 können außerdem Unterbrechungen der Beschichtung ausgeführt werden.By adjusting the roller 6 of Figure 3 in the axial plane 15 both in the axial direction 17 and in the radial direction 18, the devices 3a and 3b can be easily adapted to different properties of the substrate 2, the metallic liquid and the desired thickness of the coating , By increasing the distance between substrate 2 and roller 6 in the radial direction 18 also interruptions of the coating can be performed.

Claims (10)

  1. A method for applying a metallic or inorganic coating to a strip-like material, with the material of the coating being applied in the molten state by means of at least one rotating roller, being solidified by cooling, and being joined with the substrate, with a film of the material of the coating being produced at least on one section of the jacket of the roller and the substrate being guided relative to the roller at such a distance that in a contact region the material of the coating flows continuously from the roller to the surface of the substrate, characterized in that the liquid material of the coating is conveyed from an inner cavity of the roller through passages onto the jacket of the roller.
  2. A method according to the preceding claim, characterized in that the strip-like material is moved in its longitudinal direction relative to the stationary roller and in the contact region in a substantially vertically upward direction.
  3. A method according to at least one of the preceding claims, characterized in that the strip-like material is a metallic strip and the material of the coating is a metal, with the melting point of the coating being lower than the melting point of the strip-like material.
  4. A method according to at least one of the preceding claims, characterized in that in the contact region the directions of movement of the surface to be coated and the jacket of the roller are mutually opposite.
  5. An apparatus (1) for applying a metallic or inorganic coating to a strip-like material (2), with the material of the coating being applied in the molten state by means of at least one rotating roller (6), whereupon it solidifies by cooling and joins with the strip-like material (2), with a film of the material of the coating being producible at least on one section of the jacket (13) and with the strip-like material (2) being guidable at such a distance from the roller (6) that in a contact region (16) the material of the coating flows continuously from the jacket (13) of the roller (6) to the strip-like material (2), characterized in that a roller (6) comprises an inner cavity which can be supplied with pressurized liquid material of the coating, and that the roller (6) is provided with passages (12) for an outlet of the liquid material from the cavity to the jacket (13).
  6. An apparatus according to the preceding claim, characterized in that at least one roller (6) each is arranged on opposite sides of the strip-like material (2).
  7. An apparatus according to at least one of the preceding apparatus claims, characterized in that rollers (6) are arranged behind one another in the direction of the relative movement of roller (6) and strip-like material (2) on a surface to be coated, with which different materials for coating can be applied.
  8. An apparatus according to at least one of the preceding apparatus claims, characterized in that a roller (6) is heatable at least over a part of its circumference.
  9. An apparatus according to one of the preceding apparatus claims, characterized in that passages (12) are arranged within grooves (11a) in the jacket (13) of a roller (6), which grooves extend in a helical manner with constant ascent.
  10. An apparatus according to one of the preceding apparatus claims, characterized in that passages (12) are arranged within grooves (11b) in the jacket (13) of a roller (6), which grooves extend perpendicularly to the longitudinal axis of a roller (6) and are arranged in an equidistant manner relative to each other.
EP02017471A 2001-08-14 2002-08-05 Process and apparatus for coating with a melted product Expired - Lifetime EP1284164B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10139923 2001-08-14
DE10139923A DE10139923A1 (en) 2001-08-14 2001-08-14 Method and device for molten coating

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EP1284164A1 EP1284164A1 (en) 2003-02-19
EP1284164B1 true EP1284164B1 (en) 2006-03-15

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AT (1) ATE320319T1 (en)
DE (2) DE10139923A1 (en)
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CN101362127B (en) * 2007-08-10 2011-07-20 宝山钢铁股份有限公司 Silicon steel double-roller type coating machine frame swaying device

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CN101477949A (en) * 2008-01-04 2009-07-08 陈科 Silicon chip, manufacturing method and apparatus thereof
CN103094376A (en) * 2011-11-01 2013-05-08 智盛全球股份有限公司 Polycrystalline silicon substrate of combined type solar cell and solar cell thereof
CN115478238A (en) * 2022-08-29 2022-12-16 上海天阳钢管有限公司 Photovoltaic solder strip processing is with scribbling tin device

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JPS54155128A (en) * 1978-05-29 1979-12-06 Nippon Steel Corp Hot dipping apparatus
US4370356A (en) * 1981-05-20 1983-01-25 Integrated Technologies, Inc. Method of meniscus coating
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CN101362127B (en) * 2007-08-10 2011-07-20 宝山钢铁股份有限公司 Silicon steel double-roller type coating machine frame swaying device

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EP1284164A1 (en) 2003-02-19
DE50206063D1 (en) 2006-05-11
ES2260364T3 (en) 2006-11-01
ATE320319T1 (en) 2006-04-15
DE10139923A1 (en) 2003-03-06

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