EP0260533A2 - Method and apparatus for removing a liquid coating from steel strip - Google Patents
Method and apparatus for removing a liquid coating from steel strip Download PDFInfo
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- EP0260533A2 EP0260533A2 EP87112839A EP87112839A EP0260533A2 EP 0260533 A2 EP0260533 A2 EP 0260533A2 EP 87112839 A EP87112839 A EP 87112839A EP 87112839 A EP87112839 A EP 87112839A EP 0260533 A2 EP0260533 A2 EP 0260533A2
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/14—Removing excess of molten coatings; Controlling or regulating the coating thickness
- C23C2/16—Removing excess of molten coatings; Controlling or regulating the coating thickness using fluids under pressure, e.g. air knives
- C23C2/18—Removing excess of molten coatings from elongated material
- C23C2/20—Strips; Plates
Definitions
- the invention relates to a method for stripping sheet metal coated with molten material and in particular for stripping sheet metal or sheet material coated in a galvanizing or hot-dip coating system immediately after the coated sheet has left a bath of molten coating material, with both sides of the strip-like or sheet-like sheet be blown off with a curtain-like thin gas jet.
- the invention relates to an apparatus for performing this method with two glass nozzles arranged opposite one another close above the bath passing through the sheet, which form a curtain-like thin gas jet for blowing off both sides of the strip-shaped sheet or sheet material passing between them.
- the surfaces of the coated sheet can be blown off with air.
- this leads to an oxidation or other influence on the coating material, which in turn can result in defects on the coated surfaces. Therefore one has gone over to Blow off the coated sheet metal surfaces to use inert gas such as nitrogen gas.
- inert gas such as nitrogen gas.
- the invention is based on the object of being able to carry out the coating of sheet metal coated in a galvanizing or hot-coating installation and in particular continuously of strip-like sheet material passing through such an installation on the one hand without undesirable oxidation phenomena and on the other hand as inexpensively as possible.
- the method of the type mentioned at the outset is designed in that the sheet or strip-shaped sheet material is blown off with an inert gas, which is significantly heavier than air and is circulated.
- the sheet is blown off with sulfur hexafluoride or a mixture thereof.
- the inert gases such as nitrogen gas used to blow off coated sheet metal surfaces are only relatively little heavier than air and, because of their own weight, do not separate easily and precisely enough from air. The recovery of such gases is therefore poor and only possible incompletely. Also, such gases cannot adequately or completely shield the surface of the melt of the coating material in the bath of a galvanizing or hot-coating system against the action of air.
- a gas such as sulfur hexafluoride is about five times heavier than nitrogen gas and much heavier than air, so that it separates itself from air precisely due to its own weight and can therefore be aspirated and used again. There are no zones in the border area between this gas and air in which mixing between air and this gas takes place and oxidation is possible.
- the relatively heavy sulfur hexafluoride does not rise to the top and therefore only has to be ensured for the recovery that it can sink in a defined zone or space, from where it can be removed for reuse and thus recovered .
- the object of the invention is achieved with a device for stripping excess coating material from the surface of sheet metal, in which the two blowing nozzles arranged opposite one another above a bath of molten coating material are arranged in a box-like shell, the side and end walls of which are at least open reach the melt level of the bath and which contains at the top of an opening for the leaking continuous sheet material.
- This box-like shell which is to be regarded as a kind of housing and extends with its side and end walls to the melting level of the bath, forms a chamber with the melt, from which the gas blown out of the blowing nozzles cannot escape uncontrollably, as long as it is ensured that sufficient gas is removed from the casing for recovery.
- blow-in gas does not escape through the opening for the leaking sheet material provided at the top of the casing, because it is heavier than oxygen and therefore has a tendency to sink downwards. Only if the gas from the shroud would not be discharged could it escape from the top opening over time.
- a connection for discharging the gas blown out of the blow nozzles is provided on the shell below the blowing nozzles arranged in the shell .
- a suction line with a suction fan can be connected to this connection.
- the shell is always in the right way with the melt in the bath in connection, according to a further feature of the invention, the shell is provided on the lower edge with buoyancy or floating bodies that come into contact with the melt in the bath and, so to speak, on the Float melt. Accordingly, fluctuations in the level of the melt level compensate themselves automatically.
- the envelope is provided within its side and end walls with an extension section which can be designed in the manner of a bellows.
- an extension section which can be designed in the manner of a bellows.
- a zinc melt (2) In a bath tank (1) of a galvanizing plant, not shown, there is a zinc melt (2), the level (3) of which can be varied within certain limits in accordance with the consumption of zinc material and the amount of refill.
- At least one deflection roller (4) is immersed in the melt, through which strip material (5) is guided, which sheet material can be and which runs through the device in the direction of an arrow (6) in a manner not shown. Further guide elements for the strip material (5) are omitted for the sake of simplifying the illustration.
- blowing nozzles (7 and 8) of known design opposite to each other, to which a blower (9) is connected via lines (10 and 11) to these blowing nozzles (7 and 8) gas, which is heavier than Air is, for example sulfur hexafluoride, under pressure.
- Air is, for example sulfur hexafluoride
- This gas is blown out of the facing slot-shaped nozzle openings (12 and 13) so that it forms an approximately horizontal curtain through which the strip material (5) passes.
- excess coating material which has been taken from the melt (2) of the bath container (1) is wiped off the surface of the strip material (5).
- blowing nozzles (7 and 8) are accommodated in a box-like casing (14), the upper wall (15) of which contains a relatively wide slot-like opening (16) through which the strip material (5) can exit.
- a circumferential floating body (21) which supports the side wall sections (17a and 18a) on the melt (2) and submerges them somewhat under their mirror (3), so that it forms a circumferential seal, which prevents the escape of gas blown into the casing (14) by the blowing nozzles (7 and 8) under the lower edge of the casing.
- connection piece (22) to which a line (23) is connected which leads to the suction side of the blower (9).
- the blower (9) thus sucks the gas used to feed the blowing nozzles (7 and 8) from the lower part of the casing (14). Since practically no gas is lost, little additional gas may be required to feed the blowing nozzles (7 and 8).
- the gas or gas mixture lying on the surface of the molten metal which is heavier than air, protects the melt against corrosion. But it is also heat-insulating and offers sound insulation.
- a siphon i.e. a U-shaped or similarly shaped pipe elbow, filled at its deepest part with sulfur hexafluoride or a mixture thereof, which is heavier than air, in order to separate two gases, a liquid and a gas or also a metal melt from the surrounding atmosphere.
- Carbon dioxide for example, is suitable as a mixed component for sulfur hexafluoride.
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Abstract
Zum Abstreifen von in einer Verzinkungs- oder Feuerbeschichtungsanlage beschichtetem Blech unmittelbar nachdem das beschichtete Blech ein Bad aus schmelzflüssigem Beschichtungsmaterial verlassen hat, werden beide Seiten des Bleches mit einem vorhangartigen dünnen Gasstrahl abgeblasen. Dabei wird ein Gas, welches deutlich schwerer als Luft ist und im Kreislauf geführt wird, benutzt, beispielsweise Schwefelhexafluorid oder ein dieses Gas enthaltendes Gasgemisch. 
Description
Die Erfindung betrifft ein Verfahren zum Abstreifen von mit schmelzflüssigem Material beschichtetem Blech und insbesondere zum Abstreifen von in einer Verzinkungs- oder Feuerbeschichtungsanlage beschichtetem Blech oder Blechmaterial unmittelbar nachdem das beschichtete Blech ein Bad aus schmelzflüssigem Beschichtungsmaterial verlassen hat, wobei beide Seiten des streifen- oder bahnförmigen Bleches mit einem vorhangartigen dünnen Gasstrahl abgeblasen werden. Außerdem betrifft die Erfindung eine Vorrichtung zum Durchführen dieses Verfahrens mit zwei einander gegenüberliegend nahe über dem von dem Blech durchlaufenden Bad angeordneten Glasdüsen, die einen vorhangartigen dünnen Gasstrahl zum Abblasen beider Seiten des zwischen ihnen hindurchlaufenden bandförmigen Bleches oder Blechmaterials bilden.The invention relates to a method for stripping sheet metal coated with molten material and in particular for stripping sheet metal or sheet material coated in a galvanizing or hot-dip coating system immediately after the coated sheet has left a bath of molten coating material, with both sides of the strip-like or sheet-like sheet be blown off with a curtain-like thin gas jet. In addition, the invention relates to an apparatus for performing this method with two glass nozzles arranged opposite one another close above the bath passing through the sheet, which form a curtain-like thin gas jet for blowing off both sides of the strip-shaped sheet or sheet material passing between them.
Es ist bekannt, die Oberflächen von Blech und insbesondere bandförmigem Blechmaterial, das in einer Verzinkungs- oder Feuerbeschichtungsanlage mit schmelzflüssigem Beschichtungsmaterial beschichtet worden ist, mit einem vorhangartigen dünnen Gasstrahl abzublasen, um überschüssiges Beschichtungsmaterial abzustreifen und zu verhindern, daß sich auf den Oberflächen des Bleches Nasen oder Streifen aus dem Beschichtungsmaterial bilden und dadurch nicht nur unschöne Oberflächen entstehen, sondern die Beschichtung auch an unterschiedlichen Stellen unnötig dick wird, was einen unnötig hohen Verbrauch an Beschichtungsmaterial bedeutet.It is known to blow off the surfaces of sheet metal and, in particular, strip-shaped sheet material that has been coated with molten coating material in a galvanizing or hot-coating system, with a curtain-like thin gas jet in order to strip off excess coating material and to prevent noses from forming on the surfaces of the sheet metal or form strips from the coating material and this not only creates unsightly surfaces, but the coating also becomes unnecessarily thick at different points, which means an unnecessarily high consumption of coating material.
Man kann die Oberflächen des beschichteten Bleches mit Luft abblasen. Dies führt jedoch zu einer Oxidation oder sonstigen Beeinflussung des Beschichtungsmaterials, was wiederum Fehler an den beschichteten Oberflächen zur Folge haben kann. Deshalb ist man dazu übergegangen, zum Abblasen der beschichteten Blechoberflächen inertes Gas wie Stickstoffgas zu verwenden. Dadurch läßt sich zwar das Oxidationsproblem einigermaßen befriedigend vermeiden, jedoch ist der Gasverbrauch verhältnismäßig hoch, was zu unerwünschten Kostensteigerungen führt.The surfaces of the coated sheet can be blown off with air. However, this leads to an oxidation or other influence on the coating material, which in turn can result in defects on the coated surfaces. Therefore one has gone over to Blow off the coated sheet metal surfaces to use inert gas such as nitrogen gas. Although the oxidation problem can be avoided to some extent satisfactorily, the gas consumption is relatively high, which leads to undesirable cost increases.
Der Erfindung liegt die Aufgabe zugrunde, das Beschichten von in einer Verzinkungs- oder Feuerbeschichtungsanlage beschichtetem Blech und insbesondere kontinuierlich durch eine derartige Anlage hindurchlaufendem bandförmigen Blechmaterial einerseits ohne unerwünschte Oxidationserscheinungen und andererseits so preiswert wie möglich durchführen zu können.The invention is based on the object of being able to carry out the coating of sheet metal coated in a galvanizing or hot-coating installation and in particular continuously of strip-like sheet material passing through such an installation on the one hand without undesirable oxidation phenomena and on the other hand as inexpensively as possible.
Zur Lösung dieser Aufgabe wird das Verfahren der eingangs genannten Gattung dadurch ausgestaltet, daß das Blech oder bandförmige Blechmaterial mit einem inerten Gas, welches deutlich schwerer als Luft ist und in einem Kreislauf geführt wird, abgeblasen wird. Insbesondere wird erfindungsgemäß das Blech mit Schwefelhexafluorid oder einem Gemisch desselben abgeblasen.To achieve this object, the method of the type mentioned at the outset is designed in that the sheet or strip-shaped sheet material is blown off with an inert gas, which is significantly heavier than air and is circulated. In particular, according to the invention, the sheet is blown off with sulfur hexafluoride or a mixture thereof.
Ein Gas oder Gasgemisch, welches deutlich oder mehrfäch schwerer als Luft ist, fällt aufgrund seines Eigengewichtes mehr oder weniger senkrecht nach unten. Daher kann es verhältnismäßig leicht aufgefangen und einer erneuten Verwendung wieder zugeführt werden. Die bisher zum Abblasen von beschichteten Blechoberflächen verwendeten inerten Gase wie Stickstoffgas sind nur verhältnismäßig wenig schwerer als Luft und trennen sich aufgrund ihres Eigengewichtes nicht ohne weiteres und genau genug von Luft. Daher ist eine Rückgewinnung derartiger Gase schlecht und auch nur unvollständig möglich. Auch können derartige Gase die Oberfläche der im Bad einer Verzinkungs- oder Feuerbeschichtungsanlage befindlichen Schmelze des Beschichtungsmaterials nicht ausreichend bzw. vollständig genug gegen die Einwirkung von Luft Sauerstoff abschirmen.A gas or gas mixture that is significantly or several times heavier than air falls more or less vertically due to its own weight. It is therefore relatively easy to collect and reuse. The inert gases such as nitrogen gas used to blow off coated sheet metal surfaces are only relatively little heavier than air and, because of their own weight, do not separate easily and precisely enough from air. The recovery of such gases is therefore poor and only possible incompletely. Also, such gases cannot adequately or completely shield the surface of the melt of the coating material in the bath of a galvanizing or hot-coating system against the action of air.
Ein Gas wie Schwefelhexafluorid ist etwa fünfmal schwerer als Stickstoffgas und noch viel schwerer als Luft, so daß es sich allein aufgrund seines Eigengewichtes genau von Luft trennt und dementsprechend auch gezielt abgesaugt und einer erneuten Verwendung zugeführt werden kann. Es entstehen im Grenzbereich zwischen diesem Gas und Luft keine Zonen, in denen eine Vermischung zwischen Luft und diesem Gas stattfindët und eine Oxidation möglich ist. Hinzu kommt, daß das verhältnismäßig schwere Schwefelhexafluorid nicht nach oben steigt und daher für die Rückgewinnung lediglich sichergestellt sein muß, daß es in einer definierten Zone oder einem definierten Raum nach unten sinken kann, von wo es sich für eine erneute Verwendung abführen und somit rückgewinnen läßt.A gas such as sulfur hexafluoride is about five times heavier than nitrogen gas and much heavier than air, so that it separates itself from air precisely due to its own weight and can therefore be aspirated and used again. There are no zones in the border area between this gas and air in which mixing between air and this gas takes place and oxidation is possible. In addition, the relatively heavy sulfur hexafluoride does not rise to the top and therefore only has to be ensured for the recovery that it can sink in a defined zone or space, from where it can be removed for reuse and thus recovered .
Weiterhin wird die Aufgabe der Erfindung mit einer Vorrichtung zum Abstreifen von überschüssigem Beschichtungsmaterial von der Oberfläche von Blech gelöst, bei der die beiden über einem Bad aus schmelzflüssigem Beschichtungsmaterial einander gegenüberliegend angeordneten Blasdüsen in einer kastenartigen Hülle angeordnet sind, deren Seiten- und Stirnwände bis wenigstens auf den Schmelzenspiegel des Bades reichen und die an der Oberseite einer Öffnung für das auslaufende kontinuierliche Blechmaterial enthält. Diese als eine Art Gehäuse anzusehende kastenartige Hülle, die mit ihren Seiten- und Stirnwänden bis auf den Schmelzspiegel des Bades reicht, bildet mit der Schmelze eine Kammer, aus der das aus den Blasdüsen ausgeblasene Gas nicht unkontrolliert entweichen kann, solange dafür gesorgt wird, daß das Gas in ausreichender Menge aus der Hülle zur Rückgewinnung abgeführt wird. Durch die an der Oberseite der Hülle vorgesehene Öffnung für das auslaufende Blechmaterial entweicht daseingeblasene Gas nicht, weil es schwerer als Sauerstöff ist und somit die Tendenz hat, nach unten zu sinken. Nur wenn das Gas aus der Hülle nicht abgeführt werden würde, könnte es aus der oberen Öffnung mit der Zeit ausquellen.Furthermore, the object of the invention is achieved with a device for stripping excess coating material from the surface of sheet metal, in which the two blowing nozzles arranged opposite one another above a bath of molten coating material are arranged in a box-like shell, the side and end walls of which are at least open reach the melt level of the bath and which contains at the top of an opening for the leaking continuous sheet material. This box-like shell, which is to be regarded as a kind of housing and extends with its side and end walls to the melting level of the bath, forms a chamber with the melt, from which the gas blown out of the blowing nozzles cannot escape uncontrollably, as long as it is ensured that sufficient gas is removed from the casing for recovery. The blow-in gas does not escape through the opening for the leaking sheet material provided at the top of the casing, because it is heavier than oxygen and therefore has a tendency to sink downwards. Only if the gas from the shroud would not be discharged could it escape from the top opening over time.
Um das in die Hülle eingeblasene schwere Gas in ausreichender Menge, d.h. mindestens in der nachströmenden Menge abführen zu können, ist nach einem weiteren Merkmal der Erfindung unterhalb der in der Hülle angeordneten Blasdüsen an der Hülle ein Anschluß zum Abführen des aus den Blasdüsen ausgeblasenen Gases vorgesehen. An diesen Anschluß kann eine Saugleitung mit einem Sauggebläse angeschlossen werden.In order to be able to discharge the heavy gas blown into the shell in a sufficient quantity, ie at least in the inflowing quantity, a connection for discharging the gas blown out of the blow nozzles is provided on the shell below the blowing nozzles arranged in the shell . A suction line with a suction fan can be connected to this connection.
Damit die Hülle stets in der richtigen Weise mit der Schmelze im Bad in Verbindung steht, ist nach einem weiteren Merkmal der Erfindung die Hülle an der Unterkante mit Auftriebs- oder Schwimmkörpern versehen, die mit der im Bad befindlichen Schmelze in Kontakt treten und sozusagen auf der Schmelze schwimmen. Dementsprechend gleichen sich Schwankungen in der Schmelzenspiegelhöhe selbstätig aus.So that the shell is always in the right way with the melt in the bath in connection, according to a further feature of the invention, the shell is provided on the lower edge with buoyancy or floating bodies that come into contact with the melt in the bath and, so to speak, on the Float melt. Accordingly, fluctuations in the level of the melt level compensate themselves automatically.
Um einen solchen Ausgleich besonders günstig zu ermöglichen, ist nach noch einem anderen Merkmal der Erfindung die Hülle innerhalb ihrer Seiten- und Stirnwände mit einem Verlängerungsabschnitt versehen, der nach Art eines Faltenbalges ausgebildet sein kann. Somit kann der untere Teil der Hülle auf der Schmelze schwimmen, während der obere Teil der Hülle an einem Festpunkt angebracht ist. Die Lage der Hülle in der Vorrichtung läßt sich dadurch genau fixieren, ohne daß die Anpassbarkeit an die Höhe des Schmelzenspiegels beeinträchtigt würde.In order to enable such a compensation particularly cheaply, according to yet another feature of the invention, the envelope is provided within its side and end walls with an extension section which can be designed in the manner of a bellows. Thus, the lower part of the shell can float on the melt while the upper part of the shell is attached at a fixed point. The position of the casing in the device can thereby be fixed precisely without the adaptability to the height of the melt level being impaired.
In der Zeichnung ist schematisch in Seitenansicht eine Ausführungsform der erfindungsgemäßen Vorrichtung zum Absteifen von überschüssigem Beschichtungsmaterial von der Oberfläche von durch diese Vorrichtung hindurchlaufendem bandförmigen Blech dargestellt.In the drawing, an embodiment of the device according to the invention for stiffening excess coating material from the surface of strip-shaped sheet metal passing through this device is shown schematically in side view.
In einem Badbehälter (1) einer nicht näher dargestellten Verzinkungsanlage befindet sich eine Zinkschmelze (2), deren Spiegel (3) entsprechend dem Verbrauch von Zinkmaterial und der Nachfüllmenge in seiner Höhe innerhalb gewisser Grenzen variabel ist.In a bath tank (1) of a galvanizing plant, not shown, there is a zinc melt (2), the level (3) of which can be varied within certain limits in accordance with the consumption of zinc material and the amount of refill.
In die Schmelze eingetaucht ist zumindest eine Umlenkrolle (4) gelagert, über die Bandmaterial (5) geführt ist, welches Blechmaterial sein kann und welches in Richtung eines Pfeiles (6) in nicht näher dargestellter Weise durch die Vorrichtung hindurchläuft. Weitere Führungselemente für das Bandmaterial (5) sind aus Gründen der Vereinfachung der Darstellung weggelassen.At least one deflection roller (4) is immersed in the melt, through which strip material (5) is guided, which sheet material can be and which runs through the device in the direction of an arrow (6) in a manner not shown. Further guide elements for the strip material (5) are omitted for the sake of simplifying the illustration.
Oberhalb des Badbehälters (1) befinden sich einander gegenüberliegend zwei Blasdüsen (7 und 8) bekannter Ausführung, an die ein Gebläse (9) über Leitungen (10 und 11) angeschlossen ist, um diesen Blasdüsen (7 und 8) Gas, das schwerer als Luft ist, beispielsweise Schwefelhexafluorid, unter Druck zuführen. Dieses Gas wird aus den einander zugewandten schlitzförmigen Düsenöffnungen (12 und 13) ausgeblasen, so daß es einen etwa horizontalen Vorhang bildet, durch den das Bandmaterial (5) hindurchtritt. Dadurch wird überschüssiges Beschichtungsmaterial, das aus der Schmelze (2) des Badbehälters (1) mitgenommen worden ist, von der Oberfläche des Bandmaterials (5) abgestreift.Above the bath tank (1) there are two blowing nozzles (7 and 8) of known design opposite to each other, to which a blower (9) is connected via lines (10 and 11) to these blowing nozzles (7 and 8) gas, which is heavier than Air is, for example sulfur hexafluoride, under pressure. This gas is blown out of the facing slot-shaped nozzle openings (12 and 13) so that it forms an approximately horizontal curtain through which the strip material (5) passes. As a result, excess coating material which has been taken from the melt (2) of the bath container (1) is wiped off the surface of the strip material (5).
Die Blasdüsen (7 und 8) sind in einer kastenartigen Hülle (14) untergebracht, deren obere Wand (15) eine verhältnismäßig breite schlitzartige Öffnung (16) enthält, durch die das Bandmaterial (5) austreten kann.The blowing nozzles (7 and 8) are accommodated in a box-like casing (14), the upper wall (15) of which contains a relatively wide slot-like opening (16) through which the strip material (5) can exit.
Die Seitenwände (17 und 18) enthalten ebenso wie die Stirnwände, was in der Zeichnung nicht im einzelnen dargestellt ist, faltenbalgartige Expansions- oder Verlängerungsabschnitte (19 und 20), die es ermöglichen, daß sich die unteren Abschnitte (17a und 18a) der Wände in senkrechter Richtung relativ zu dem oberen Teil der Hülle (14) oder umgekehrt bewegen können. Am unteren Rand der unteren Abschnitte (17a und 18a) der Seitenwände befindet sich ein umlaufender Schwimmkörper (21), der die Seitenwandabschnitte (17a und 18a) auf der Schmelze (2) abstützt und etwas unter deren Spiegel (3) untertaucht, so daß er eine umlaufende Dichtung bildet, welche ein Entweichen von in die Hülle (14) durch die Blasdüsen (7 und 8) eingeblasenem Gas unter dem unteren Rand der Hülle verhindert.The side walls (17 and 18) as well as the end walls, which is not shown in detail in the drawing, contain bellows-like expansion or extension sections (19 and 20) which allow the lower sections (17a and 18a) of the walls to be located can move in the vertical direction relative to the upper part of the shell (14) or vice versa. At the lower edge of the lower sections (17a and 18a) of the side walls there is a circumferential floating body (21) which supports the side wall sections (17a and 18a) on the melt (2) and submerges them somewhat under their mirror (3), so that it forms a circumferential seal, which prevents the escape of gas blown into the casing (14) by the blowing nozzles (7 and 8) under the lower edge of the casing.
In dem unteren Abschnitt (18a) der Seitenwand (18) befindet sich ein Anschlußstutzen (22), an den eine Leitung (23) angeschlossen ist, die zur Saugseite des Gebläses (9) führt. Somit saugt das Gebläse (9) das zum Beschicken der Blasdüsen (7 und 8) benutzte Gas aus dem unteren Teil der Hülle (14) ab. Da praktisch kein Gas verloren geht, braucht allenfalls wenig zusätzliches Gas für die Beschickung der Blasdüsen (7 und 8) zugeführt werden.In the lower section (18a) of the side wall (18) there is a connection piece (22) to which a line (23) is connected which leads to the suction side of the blower (9). The blower (9) thus sucks the gas used to feed the blowing nozzles (7 and 8) from the lower part of the casing (14). Since practically no gas is lost, little additional gas may be required to feed the blowing nozzles (7 and 8).
Das auf der Oberfläche der Metallschmelze liegende Gas oder Gasgemisch, das schwerer als Luft ist, schützt die Schmelze gegen Korrosion. Es ist aber auch wärmeisolierend und bietet einen Schallschutz.The gas or gas mixture lying on the surface of the molten metal, which is heavier than air, protects the melt against corrosion. But it is also heat-insulating and offers sound insulation.
Die Erfindung ist auch für andere Anwendungsfälle geeignet, in denen eine gasförmige Isolationsschicht wünschenswert oder zweckmäßig ist. So kann beispielsweise ein Siphon , d.h. ein U-förmig oder ähnlich ausgebildeter Rohrkrümmer, an seinem tiefsten Abschnitt mit Schwefelhexafluorid oder einem Gemisch desselben, das schwerer als Luft ist, gefüllt werden, um zwei Gase, eine Flüssigkeit und ein Gas oder auch eine Metallschmelze von der umliegenden Atmosphäre zu trennen.The invention is also suitable for other applications in which a gaseous insulation layer is desirable or expedient. For example, a siphon, i.e. a U-shaped or similarly shaped pipe elbow, filled at its deepest part with sulfur hexafluoride or a mixture thereof, which is heavier than air, in order to separate two gases, a liquid and a gas or also a metal melt from the surrounding atmosphere.
Als Mischkomponente für Schwefelhexafluorid ist beispielsweise Kohlendioxyd geeignet.Carbon dioxide, for example, is suitable as a mixed component for sulfur hexafluoride.
Claims (7)
dadurch gekennzeichnet, daß das Blech mit einem Gas, welches deutlich schwerer als Luft ist und im Kreislauf geführt wird, abgeblasen wird.1. A method for stripping sheet metal coated in a galvanizing or hot-dip coating plant immediately after the coated sheet has left a bath of molten coating material, both sides of the sheet being blown off with a curtain-like thin gas jet,
characterized in that the sheet is blown off with a gas which is significantly heavier than air and is circulated.
dadurch gekennzeichnet, daß die beiden Blasdüsen (7, 8) in einer kastenartigen Hülle (14) angeordnet sind, deren Seitenund Stirnwände (17, 18) bis wenigstens auf den Schmelzenspiegel (3) des Bades (2) reichen und die an der Oberseite (15) eine Öffnung (16) für das auslaufende Blechmaterial (5) enthält.3. Apparatus for stripping excess coating material from the surface of sheet metal which has passed through a bath of molten coating material in a galvanizing or hot-coating installation, with two blowing nozzles arranged opposite one another close above the bath, which have a curtain-like thin gas jet for blowing off both sides of the form between them band-shaped sheet metal material to carry out the method according to claim 1 or 2,
characterized in that the two blowing nozzles (7, 8) are arranged in a box-like casing (14), the side and end walls (17, 18) of which extend at least to the melt level (3) of the bath (2) and which are located on the top ( 15) contains an opening (16) for the leaking sheet material (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT87112839T ATE73176T1 (en) | 1986-09-19 | 1987-09-03 | METHOD AND APPARATUS FOR STRIPING METAL COATED METAL SHEET METAL. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3631893 | 1986-09-19 | ||
| DE19863631893 DE3631893A1 (en) | 1986-09-19 | 1986-09-19 | METHOD AND DEVICE FOR STRIPING SHEET COATED WITH MELT LIQUID MATERIAL |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0260533A2 true EP0260533A2 (en) | 1988-03-23 |
| EP0260533A3 EP0260533A3 (en) | 1989-03-15 |
| EP0260533B1 EP0260533B1 (en) | 1992-03-04 |
Family
ID=6309928
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP87112839A Expired - Lifetime EP0260533B1 (en) | 1986-09-19 | 1987-09-03 | Method and apparatus for removing a liquid coating from steel strip |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US4862825A (en) |
| EP (1) | EP0260533B1 (en) |
| JP (1) | JPS6386854A (en) |
| AT (1) | ATE73176T1 (en) |
| AU (1) | AU600019B2 (en) |
| DE (2) | DE3631893A1 (en) |
| ES (1) | ES2030406T3 (en) |
| GR (1) | GR3004037T3 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2857280A1 (en) * | 2003-07-08 | 2005-01-14 | Dominique Laurain | Tank for the uniform coating of components with a liquid coating material incorporating a system for the evacuation of surplus coating material, notably for zinc coating strip |
| CN107881451A (en) * | 2017-12-12 | 2018-04-06 | 蒋丁贵 | A tinning equipment |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4010801C2 (en) * | 1990-04-04 | 1998-07-23 | Unitas Sa | Device for stripping running tape material |
| US6861159B2 (en) | 1992-03-27 | 2005-03-01 | The Louis Berkman Company | Corrosion-resistant coated copper and method for making the same |
| US6080497A (en) * | 1992-03-27 | 2000-06-27 | The Louis Berkman Company | Corrosion-resistant coated copper metal and method for making the same |
| US6794060B2 (en) | 1992-03-27 | 2004-09-21 | The Louis Berkman Company | Corrosion-resistant coated metal and method for making the same |
| US6652990B2 (en) * | 1992-03-27 | 2003-11-25 | The Louis Berkman Company | Corrosion-resistant coated metal and method for making the same |
| US5491036A (en) * | 1992-03-27 | 1996-02-13 | The Louis Berkman Company | Coated strip |
| US5597656A (en) * | 1993-04-05 | 1997-01-28 | The Louis Berkman Company | Coated metal strip |
| BR0311470A (en) * | 2002-06-28 | 2005-03-15 | Sms Demag Ag | Use of separating gas during continuous hot bath dip finishing process |
| DE10333766B4 (en) * | 2003-07-23 | 2009-01-22 | Thyssenkrupp Steel Ag | Method and apparatus for hot dip coating of metal strip |
| DE102004021214B4 (en) * | 2004-04-29 | 2007-11-22 | Air Liquide Gmbh | Method and device for inerting the environment of a running strip material after a dip treatment |
| BE1018124A3 (en) * | 2008-07-01 | 2010-05-04 | Ct Rech Metallurgiques Asbl | Metal products i.e. steel wires, coating method, involves coating metal products by molten metal using heavy gas at molecular weight greater than or equal to specific value, where gas does not decompose at temperatures below specific value |
| KR101222346B1 (en) | 2010-12-13 | 2013-01-14 | 동부제철 주식회사 | apparatus to produce galvanizing steel sheets |
| US11357341B2 (en) | 2019-02-26 | 2022-06-14 | Fasteners For Retail, Inc. | Retail merchandise display device with security shield |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE369436C (en) * | 1920-11-12 | 1923-02-19 | Childe Harold Wills | Circulation fan for hydrocarbon engines |
| DE617024C (en) * | 1929-06-12 | 1935-08-10 | Karl Daeves Dr Ing | Process to prevent the formation of white rust on galvanized goods |
| AU421751B2 (en) * | 1968-03-08 | 1972-02-25 | Australian Wire Industries Pty, Ltd | Improved method of and apparatus for wiping galvanised wire or strip |
| US3842896A (en) * | 1973-06-04 | 1974-10-22 | Monsanto Co | Method for producing composite metal wire |
| JPS5591967A (en) * | 1978-12-30 | 1980-07-11 | Nippon Steel Corp | One-side hot dipping method for steel strip |
| US4330574A (en) * | 1979-04-16 | 1982-05-18 | Armco Inc. | Finishing method for conventional hot dip coating of a ferrous base metal strip with a molten coating metal |
| AU538925B2 (en) * | 1979-04-16 | 1984-09-06 | Ak Steel Corporation | Finishing of hop dip coating of ferrous base metal |
| US4287238A (en) * | 1980-04-11 | 1981-09-01 | Bethlehem Steel Corporation | Protective atmosphere gas wiping apparatus and method of using |
| FR2544337B1 (en) * | 1983-04-13 | 1985-08-09 | Ziegler Sa | METHOD AND INSTALLATION FOR THE CONTINUOUS COATING OF A STRIP USING AN OXIDIZABLE COATING |
-
1986
- 1986-09-19 DE DE19863631893 patent/DE3631893A1/en not_active Withdrawn
-
1987
- 1987-09-03 EP EP87112839A patent/EP0260533B1/en not_active Expired - Lifetime
- 1987-09-03 DE DE8787112839T patent/DE3777040D1/en not_active Expired - Lifetime
- 1987-09-03 AT AT87112839T patent/ATE73176T1/en not_active IP Right Cessation
- 1987-09-03 ES ES198787112839T patent/ES2030406T3/en not_active Expired - Lifetime
- 1987-09-08 AU AU78160/87A patent/AU600019B2/en not_active Ceased
- 1987-09-14 US US07/096,554 patent/US4862825A/en not_active Expired - Lifetime
- 1987-09-16 JP JP62233629A patent/JPS6386854A/en active Pending
-
1992
- 1992-03-11 GR GR920400430T patent/GR3004037T3/el unknown
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2857280A1 (en) * | 2003-07-08 | 2005-01-14 | Dominique Laurain | Tank for the uniform coating of components with a liquid coating material incorporating a system for the evacuation of surplus coating material, notably for zinc coating strip |
| CN107881451A (en) * | 2017-12-12 | 2018-04-06 | 蒋丁贵 | A tinning equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| ES2030406T3 (en) | 1992-11-01 |
| DE3631893A1 (en) | 1988-03-31 |
| AU600019B2 (en) | 1990-08-02 |
| US4862825A (en) | 1989-09-05 |
| AU7816087A (en) | 1988-03-24 |
| ATE73176T1 (en) | 1992-03-15 |
| EP0260533B1 (en) | 1992-03-04 |
| JPS6386854A (en) | 1988-04-18 |
| GR3004037T3 (en) | 1993-03-31 |
| EP0260533A3 (en) | 1989-03-15 |
| DE3777040D1 (en) | 1992-04-09 |
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