EP0369477A2 - Process and apparatus for coating sheet metal with powder paint - Google Patents

Process and apparatus for coating sheet metal with powder paint Download PDF

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Publication number
EP0369477A2
EP0369477A2 EP89121340A EP89121340A EP0369477A2 EP 0369477 A2 EP0369477 A2 EP 0369477A2 EP 89121340 A EP89121340 A EP 89121340A EP 89121340 A EP89121340 A EP 89121340A EP 0369477 A2 EP0369477 A2 EP 0369477A2
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EP
European Patent Office
Prior art keywords
station
powder coating
strip
strip plate
sheet metal
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EP89121340A
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German (de)
French (fr)
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EP0369477B1 (en
EP0369477A3 (en
Inventor
Adolf Berkmann
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COLUMBUS SYSTEM PATENT AG
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COLUMBUS SYSTEM PATENT AG
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    • 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
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
    • 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
    • B05D1/26—Processes for applying liquids or other fluent materials performed by applying the liquid or other fluent material from an outlet device in contact with, or almost in contact with, the surface
    • B05D1/265—Extrusion coatings
    • 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
    • B05D1/40—Distributing applied liquids or other fluent materials by members moving relatively to surface
    • 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
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
    • B05D3/0254—After-treatment

Definitions

  • the invention relates to a method for coating sheet-like strip sheets with powder coating, which are wound on a roll of tape.
  • the invention also relates to an apparatus for performing the method.
  • solid resin, hardener, coloring pigments, additives and extenders are mixed, plasticized in an extruder and discharged from the extruder, whereupon the strand-like material emerging from the extruder Material is rolled out between cooling rolls and cooled on a subsequent cooling belt. After cooling, the hardened plastic band is crushed and then crushed and sieved. The powder thus obtained can then be used as a powder coating for coating objects. Objects with finite dimensions are usually coated. If endless tapes that are to be unwound from a tape roll are now to be coated with powder coatings, then if a rational production is to be aimed for, which requires high tape speeds, a great many powder spray guns are necessary. The powdery masses emerging from the powder spray guns, which do not stick to the belt, must be vacuumed off again, which can lead to non-uniform powder distributions on the belt in the case of large belt widths due to the high suction speed required.
  • the object of the invention is to provide a method and a device by means of which sheet-like strip sheets drawn off from a strip roll at high speed can be coated with powder coating in a uniform manner with little effort.
  • the sheet-like strip is first pretreated and dried, that the powder coating is in a flowable state on the moving strip at a temperature which is below the reaction temperature of the hardener, immediately applied and pressed onto the strip plate and distributed and that the applied powder coating layer is then brought to a temperature above the reaction time of the hardener by the action of heat and thus liquefied and evenly distributed and brought to hardening, whereupon the strip plate is cooled and wound up into a strip roll.
  • the powder coating is advantageously applied directly to the strip plate by means of an extruder.
  • the flowable powder coating applied is distributed and pressed onto the strip plate by rolling.
  • This procedure makes it possible to apply a uniform layer of powder coating in a flowable state even with fast-moving belts.
  • the tape coated in this way then runs through an oven, the heat being supplied to liquefy and harden the applied powder coating layer by means of medium-wave infrared rays.
  • By heating the applied lacquer layer it is distributed even more finely and brought to hardening, whereby a completely uniformly coated strip plate is obtained after cooling.
  • strip plates can be coated with high throughput speeds and thus high economic efficiency.
  • What is essential here is the fact that the powder coating is applied in a flowable state, as a result of which the effort required in conventional powder coating is used many spray guns and the suction and recovery of the excess powder can be seen.
  • the application in the flowable state and subsequent distribution and pressing by means of rollers results in a much more uniform distribution of the lacquer layer than is possible with large bandwidths in the dry powdery state because of the necessary suction, with a dry powder coating these difficulties increase with increasing bandwidth and increasing transport speed of the strip plate.
  • the present method therefore not only enables the application of a uniform lacquer layer at large bandwidths and high belt speeds, which would not be achievable with the usual coating methods with powdery, dry lacquer, but also leads to considerable savings in the production of the powder lacquer, because of how As shown above, several process steps that are necessary for the production of the dry powder coating are omitted.
  • the strip sheet coated in this way is cooled and then wound up into a roll of tape, in which case a release paper web can advantageously also be wound up.
  • the device for carrying out the method comprises a strip plate holding and unwinding station, a pretreatment station, a drying station, an extruder for the powder coating with direct powder coating application to the strip plate by means of one or more nozzles, a powder coating distribution and surface smoothing station, a post-treatment and curing station, a cooling station and a coil winding station.
  • Squeeze rollers for squeezing surface water can advantageously be provided between the pretreatment station and the drying station.
  • the pretreatment station has a flow chamber with spray nozzles, which can optionally be connected to a source with cleaning or treatment liquid and a source with rinsing liquid.
  • the strip plate is degreased, cleaned, rinsed and phosphated.
  • the drying station has a flow chamber with infrared radiators and air-blowing nozzles in order to dry the pretreated and cleaned strip plate.
  • the extruder for applying the flowable plastic material to the strip plate can be one Embodiment variant according to the invention have a slot die, which opens directly above the moving strip plate.
  • the extruder it is also possible for the extruder to have a plurality of nozzles arranged side by side, which open directly above the moving strip plate.
  • This latter variant is possible because after the flowable plastic material has been applied to the strip plate, this applied plastic material is evenly distributed in the powder coating distribution and surface smoothing station.
  • This station has at least one pair of rollers, in which the rollers are pressed against one another on both sides against the strip plate.
  • a plurality of pairs of rollers connected in series are used in order to bring about an even distribution of the applied flowable plastic material and to bring about sufficient adhesion between this material and the strip plate by the pressing process that occurs during rolling.
  • the applied plastic material is then brought into an even more flowable state before curing begins due to the higher temperature.
  • the plastic material can be distributed extremely evenly, so that an extremely uniformly distributed and thus uniformly thick powder coating layer can be achieved even with large bandwidths.
  • the drawing shows schematically an embodiment of a device or system for coating sheet-like strip sheets.
  • a band roll 2 is rotatably mounted in a band plate holding and unwinding station 1, from which a band plate 3 is pulled off and conveyed through the individual subsequent stations at high speed, for example at 60 meters / minute, in order to then end up as coated tape in a winding station 4 to be wound into a tape roll.
  • the strip 3 pulled off the strip roll 2 first passes through a pretreatment station 5, which is designed as a flow chamber and has spray nozzles 6 on the inside, which can optionally be acted upon with a treatment liquid or a rinsing liquid, the treatment liquid being used for cleaning, degreasing and phosphating the strip plate .
  • a pair of squeeze rollers 7 is provided in order to squeeze off the water adhering to the strip plate, which was required to rinse off the treatment liquid, before the strip plate 3 runs into a drying station 8, which is designed as a pass-through chamber and has infrared emitters 9 and air-blowing nozzles inside 10 has to dry the still adhering water.
  • the cleaned, degreased, phosphated and ge Dried sheet metal 3 then arrives at an extruder 11 which is equipped with a slot die 12 which opens directly above the sheet metal 3 and applies the plastic material plasticized in the extruder directly to the sheet metal 3.
  • the plastic material directly applied to the strip plate 3 in the flowable state is then evenly distributed in a powder coating distribution and surface smoothing station 13, which has a plurality of roller pairs 14, and pressed onto the strip plate 3.
  • the roller pairs 14 can be heated or cooled depending on the requirements.
  • the temperature of the plastic material emerging from the extruder is just below the temperature at which the hardener contained in the material begins to react.
  • a post-treatment and curing station 15 which, like the pre-treatment and drying station, is designed as a tunnel-like passage chamber and has infrared radiators 16 in its interior, which are applied to the strip 3 heat the applied powder coating layer to such an extent that this layer becomes even more flowable, whereby a completely uniform distribution of the powder coating layer on the strip plate is achieved.
  • the hardening of this powder coating layer activates the hardener, so that after the powder coating material has been distributed, it hardens and dries.
  • the strip plate then arrives in a cooling station 17, which is also designed as a tunnel-like flow chamber.
  • the strip plate is cooled by means of air that emerges from blow-out nozzles 18.
  • the strip sheet coated in this way is wound up in the winding station 4 to form a roll of tape, a release paper being pulled off a roll of tape 19 and also wrapped between the individual windings of the strip sheet in order to protect the powder coating layer applied.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Coating Apparatus (AREA)

Abstract

For the purpose of coating sheet metal conveyed at high speed, the latter is firstly cleaned, degreased, rinsed and phosphated in a pretreatment station (5). Thereafter, the sheet metal (3) is dried in a drying station (8) by means of infrared radiation and air, before it is provided with a powder paint coating. This coating is applied immediately onto the sheet metal (3) through one or more nozzles (12) by means of an extruder (11), whereupon the powder paint coating thus applied is distributed in a largely uniform fashion and pressed onto the sheet metal (3) by means of roller pairs (14) in a powder paint distribution and surface smoothing station (13). Subsequently, the powder paint coating is heated in an aftertreatment and hardening station (14) to such an extent that the plastic material can be distributed completely uniformly. Due to the higher temperature, hardening of the powder paint takes place. Subsequently hereto, the sheet metal provided with a powder paint coating is cooled and wound up in a winding station (4) to form a strip roll, release paper being wound in by a strip roll (19).

Description

Die Erfindung bezieht sich auf ein Verfahren zum Beschichten von bahnförmigen Bandblechen mit Pulverlack, die auf einer Bandrolle aufgewickelt sind. Die Erfindung bezieht sich auch auf eine Vorrichtung zur Durchführung des Verfahrens.The invention relates to a method for coating sheet-like strip sheets with powder coating, which are wound on a roll of tape. The invention also relates to an apparatus for performing the method.

Es ist bekannt, Gegenstände beliebiger Art mit Pulverlack zu beschichten. Dabei wird der Gegenstand in ein elektrostatisches Feld gebracht und mit trockenem, feinkörnigem Pulverlack besprüht, worauf der so beschich­tete Gegenstand in einen Ofen gebracht und das anhaftende Pulver geliert und ausgehärtet wird.It is known to coat objects of any kind with powder coating. The object is placed in an electrostatic field and sprayed with dry, fine-grained powder paint, whereupon the object coated in this way is placed in an oven and the adhering powder is gelled and cured.

Um diesen Vorgang durchführen zu können ist es notwendig, den Pulverlack in feinkörniger Form zur Verfügung zu stellen.In order to be able to carry out this process, it is necessary to provide the powder coating in fine-grained form.

Zur Herstellung von Pulverlack werden Festharz, Härter, Färbpigmente, Additive und Extender gemischt, in einem Extruder plastifiziert und aus dem Extruder ausgebracht, worauf das aus dem Extruder austretende strangförmige Material zwischen Kühlwalzen ausgewalzt und auf einem anschließenden Kühlband gekühlt wird. Nach dem Kühlen wird das erhärtete Kunststoffband zerkleinert und an­schließend zermalen und gesiebt. Danach kann das so erhalten Pulver als Pulverlack zur Beschichtung von Gegenständen eingesetzt werden. Üblicherweise werden Gegenstände mit endlichen Abmessungen beschichtet. Wenn nun endlose Bänder, die von einer Bandrolle abgewickelt werden mit Pulverlacken beschichtet werden sollen, so sind, wenn eine rationelle Fertigung angestrebt werden soll, was hohe Bandgeschwindigkeiten voraussetzt, sehr viele Pulversprühpistolen notwendig. Die aus den Pulver­sprühpistolen austretenden pulverförmigen Massen, die nicht am Band haften bleiben, müssen aber wieder abgesaugt werden, was bei großen Bandbreiten wegen der notwendigen großen Absauggeschwindigkeit zu ungleichför­migen Pulververteilungen auf dem Band führen kann.To produce powder coating, solid resin, hardener, coloring pigments, additives and extenders are mixed, plasticized in an extruder and discharged from the extruder, whereupon the strand-like material emerging from the extruder Material is rolled out between cooling rolls and cooled on a subsequent cooling belt. After cooling, the hardened plastic band is crushed and then crushed and sieved. The powder thus obtained can then be used as a powder coating for coating objects. Objects with finite dimensions are usually coated. If endless tapes that are to be unwound from a tape roll are now to be coated with powder coatings, then if a rational production is to be aimed for, which requires high tape speeds, a great many powder spray guns are necessary. The powdery masses emerging from the powder spray guns, which do not stick to the belt, must be vacuumed off again, which can lead to non-uniform powder distributions on the belt in the case of large belt widths due to the high suction speed required.

Außerdem ist der Aufwand mit den vielen Sprühpistolen und der starken Absaugleistung sehr groß.In addition, the effort with the many spray guns and the strong suction power is very large.

Aufgabe der Erfindung ist es, ein Verfahren und eine Vorrichtung bereitzustellen, mit deren Hilfe von einer Bandrolle mit hoher Geschwindigkeit abgezogene bahnför­mige Bandbleche mit Pulverlack in gleichmäßiger Weise bei geringem Aufwand beschichtet werden können.The object of the invention is to provide a method and a device by means of which sheet-like strip sheets drawn off from a strip roll at high speed can be coated with powder coating in a uniform manner with little effort.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß das bahnförmige Bandblech zunächst vorbehandelt und getrocknet wird, daß auf das bewegte Bandblech der Pulverlack in fließfähigem Zustand mit einer Temperatur, die unterhalb der Reaktionstemperatur des Härters liegt, unmittelbar aufgetragen und auf das Bandblech aufgepreßt und verteilt wird und daß dann die aufgebrachte Pulver­lackschicht durch Wärmeeinwirkung auf eine Temperatur oberhalb der Reaktionszeit des Härters gebracht und damit verflüssigt und gleichmäßig verteilt und zum Aushärten gebracht wird, worauf das Bandblech gekühlt und zu einer Bandrolle aufgewickelt wird. Das Aufbringen des Pulver­lackes erfolgt dabei in vorteilhafter Weise direkt mittels eines Extruders auf das Bandblech.This object is achieved in that the sheet-like strip is first pretreated and dried, that the powder coating is in a flowable state on the moving strip at a temperature which is below the reaction temperature of the hardener, immediately applied and pressed onto the strip plate and distributed and that the applied powder coating layer is then brought to a temperature above the reaction time of the hardener by the action of heat and thus liquefied and evenly distributed and brought to hardening, whereupon the strip plate is cooled and wound up into a strip roll. The powder coating is advantageously applied directly to the strip plate by means of an extruder.

In vorteilhafter Weiterbildung der Erfindung wird der aufgebrachte fließfähige Pulverlack durch Walzen auf das Bandblech verteilt und aufgepreßt.In an advantageous development of the invention, the flowable powder coating applied is distributed and pressed onto the strip plate by rolling.

Durch diese Verfahrensweise ist es möglich, auch bei schnell laufenden Bändern eine gleichmäßige Schicht von Pulverlack in fließfähigem Zustand aufzubringen. Das so beschichtete Band läuft dann durch einen Ofen, wobei die Wärmezufuhr zum Verflüssigen und Aushärten der aufge­brachten Pulverlackschicht durch mittelwellige Infrarot­strahlen erfolgt. Durch das Erhitzen der aufgebrachten Lackschicht wird diese noch feiner verteilt und zum Aushärten gebracht, wodurch nach dem Abkühlen ein völlig gleichmäßig beschichtetes Bandblech erhalten wird.This procedure makes it possible to apply a uniform layer of powder coating in a flowable state even with fast-moving belts. The tape coated in this way then runs through an oven, the heat being supplied to liquefy and harden the applied powder coating layer by means of medium-wave infrared rays. By heating the applied lacquer layer, it is distributed even more finely and brought to hardening, whereby a completely uniformly coated strip plate is obtained after cooling.

Diese Verfahrensweise bringt viele Vorteile mit sich. Ein wesentlicher Vorteil besteht darin, daß Bandbleche mit großen Durchlaufgeschwindigkeiten und damit hoher Wirt­schaftlichkeit beschichtet werden können. Wesentlich ist hierbei die Tatsache, daß der Pulverlack in fließfähigem Zustand aufgebracht wird, wodurch der beim üblichen Pulverbeschichten notwendige Aufwand, der im Einsatz vieler Sprühpistolen und der Absaugung und Rückgewinnung der überschüssigen Pulvermenge zu sehen ist, entfällt. Außerdem wird durch das Aufbringen im fließfähigem Zustand und anschließendem Verteilen und Verpressen mittels Walzen eine wesentlich gleichmäßigere Verteilung der Lackschicht erzielt, als dies bei großen Bandbreiten im trockenen pulverförmigen Zustand wegen der notwendigen Absaugung möglich ist, wobei bei einer trockenen Pulver­beschichtung diese Schwierigkeiten mit zunehmender Band­breite und zunehmender Transportgeschwindigkeit des Bandbleches zunehmen.This procedure has many advantages. A major advantage is that strip plates can be coated with high throughput speeds and thus high economic efficiency. What is essential here is the fact that the powder coating is applied in a flowable state, as a result of which the effort required in conventional powder coating is used many spray guns and the suction and recovery of the excess powder can be seen. In addition, the application in the flowable state and subsequent distribution and pressing by means of rollers results in a much more uniform distribution of the lacquer layer than is possible with large bandwidths in the dry powdery state because of the necessary suction, with a dry powder coating these difficulties increase with increasing bandwidth and increasing transport speed of the strip plate.

Ein weiterer wesentlicher Vorteil, der sich aus dieser Verfahrensweise ergibt besteht darin, daß der Aufwand zur Herstellung des Pulverlackes wesentlich verringert werden kann. Da nach dem vorliegenden Verfahren der Pulverlack unmittelbar aus dem Extruder auf das Bandblech aufge­bracht wird, entfällt das bei der üblichen Pulverlackher­stellung notwendige Kühlen, Zerkleinern, Zermahlen und Sieben des aus dem Extruder ausgebrachten Kunststoffma­terials.Another significant advantage that results from this procedure is that the effort for producing the powder coating can be significantly reduced. Since, according to the present process, the powder coating is applied directly from the extruder to the strip plate, the cooling, comminution, grinding and sieving of the plastic material which is brought out from the extruder is not necessary in the conventional production of powder coating.

Das vorliegende Verfahren ermöglicht also nicht nur das Aufbringen einer gleichmäßigen Lackschicht bei großen Bandbreiten und hohen Bandgeschwindigkeiten, die mit den üblichen Beschichtungsmethoden mit pulverförmigem, trockenem Lack gar nicht erzielbar wäre, sondern führt auch zu einer erheblichen Einsparung bei der Herstellung des Pulverlackes, da, wie oben aufgezeigt, mehrer Verfahrensschritte, die zur Herstellung des trockenen Pulverlackes notwendig sind, entfallen.The present method therefore not only enables the application of a uniform lacquer layer at large bandwidths and high belt speeds, which would not be achievable with the usual coating methods with powdery, dry lacquer, but also leads to considerable savings in the production of the powder lacquer, because of how As shown above, several process steps that are necessary for the production of the dry powder coating are omitted.

Nach dem Aushärten der auf das Bandblech aufgebrachten Lackschicht wird das so beschichtete Bandblech gekühlt und anschließend zu einer Bandrolle aufgewickelt, wobei in vorteilhafter Weise eine Trennpapierbahn mit aufge­wickelt werden kann.After the lacquer layer applied to the strip sheet has hardened, the strip sheet coated in this way is cooled and then wound up into a roll of tape, in which case a release paper web can advantageously also be wound up.

Die Vorrichtung zur Durchführung des Verfahrens umfaßt eine Bandblech-Halte- und Abwickelstation, eine Vorbe­handlungsstation, eine Trockenstation, einen Extruder für den Pulverlack mit direkter Pulverlackauftragung auf das Bandblech mittels einer oder mehrere Düsen, eine Pulver­lackverteil- und Oberflächenglättungsstation, eine Nach­behandlungs- und Aushärtstation, eine Kühlstation und eine Bandblechaufwickelstation.The device for carrying out the method comprises a strip plate holding and unwinding station, a pretreatment station, a drying station, an extruder for the powder coating with direct powder coating application to the strip plate by means of one or more nozzles, a powder coating distribution and surface smoothing station, a post-treatment and curing station, a cooling station and a coil winding station.

In vorteilhafter Weise können zwischen der Vorbehand­lungsstation und der Trockenstation Abquetschwalzen für das Abquetschen von Oberflächenwasser vorgesehen sein.Squeeze rollers for squeezing surface water can advantageously be provided between the pretreatment station and the drying station.

Die Vorbehandlungsstation weist eine Durchlaufskammer mit Sprühdüsen auf, die wahlweise an eine Quelle mit Reinigungs- oder Behandlungsflüssigkeit und eine Quelle mit Spülflüssigkeit anschließbar sind. Dabei wird das Bandblech entfettet, gereinigt, gespült und phosphatiert.The pretreatment station has a flow chamber with spray nozzles, which can optionally be connected to a source with cleaning or treatment liquid and a source with rinsing liquid. The strip plate is degreased, cleaned, rinsed and phosphated.

Die Trockenstation weist in vorteilhafter Ausgestaltung eine Durchlaufkammer mit Infrarotstrahlern und Luft­ausblasedüsen auf, um das vorbehandelte und gereinigte Bandblech zu trocknen.In an advantageous embodiment, the drying station has a flow chamber with infrared radiators and air-blowing nozzles in order to dry the pretreated and cleaned strip plate.

Der Extruder zum Aufbringen des fließfähigen Kunst­stoffmaterials auf das Bandblech kann entsprechend einer Ausführungsvariante nach der Erfindung eine Breitschlitz­düse aufweisen, die direkt über dem bewegten Bandblech mündet. Es ist aber auch möglich, daß der Extruder mehrer nebeneinander geordnete Düsen aufweist, die direkt über dem bewegten Bandblech münden. Diese letztere Variante ist deshalb möglich, weil nach dem Auftragen des fließfähigen Kunststoffmaterials auf das Bandblech, dieses aufgetragene Kunststoffmaterial in der Pulverlack­verteil- und Oberflächenglättungsstation gleichmäßig verteilt wird. Dabei weist diese Station zumindest ein Walzenpaar auf, bei dem die Walzen einander gegenüber­liegend zu beiden Seiten gegen das Bandblech angedrückt sind. In vorteilhafter Weise kommen mehrere hintereinan­der geschaltete Walzenpaare zum Einsatz, um eine gleich­mäßige Verteilung des aufgetragenen fließfähigen Kunst­stoffmaterials zu bewirken und dabei eine ausreichende Haftung zwischen diesem Material und dem Bandblech durch den beim Walzen eintretenden Preßvorgang herbeizuführen.The extruder for applying the flowable plastic material to the strip plate can be one Embodiment variant according to the invention have a slot die, which opens directly above the moving strip plate. However, it is also possible for the extruder to have a plurality of nozzles arranged side by side, which open directly above the moving strip plate. This latter variant is possible because after the flowable plastic material has been applied to the strip plate, this applied plastic material is evenly distributed in the powder coating distribution and surface smoothing station. This station has at least one pair of rollers, in which the rollers are pressed against one another on both sides against the strip plate. Advantageously, a plurality of pairs of rollers connected in series are used in order to bring about an even distribution of the applied flowable plastic material and to bring about sufficient adhesion between this material and the strip plate by the pressing process that occurs during rolling.

In der Nachbehandlungs- und Aushärtstation, die in vorteilhafter Weise eine Durchlaufkammer mit Infrarot­strahlen aufweist, wird dann das aufgetragene Kunst­stoffmaterial in einen noch fließfähigeren Zustand versetzt bevor aufgrund der höheren Temperatur die Aushärtung beginnt. In diesem fließfähigen Zustand kann sich das Kunststoffmaterial äußerst gleichmäßig vertei­len, so daß auch bei großen Bandbreiten eine äußerst gleichmäßig verteilte und damit gleichmäßig dicke Pulver­lackschicht erzielbar ist.In the post-treatment and curing station, which advantageously has a flow chamber with infrared rays, the applied plastic material is then brought into an even more flowable state before curing begins due to the higher temperature. In this flowable state, the plastic material can be distributed extremely evenly, so that an extremely uniformly distributed and thus uniformly thick powder coating layer can be achieved even with large bandwidths.

Die Erfindung wird nachstehend anhand eines bevorzugten Ausführungsbeispieles einer Vorrichtung zur Durchführung des Verfahrens näher erläutert.The invention is described below with the aid of a preferred exemplary embodiment of a device for carrying it out of the procedure explained in more detail.

Die Zeichnung zeigt in schematischer Weise ein Ausfüh­rungsbeispiel einer Vorrichtung bzw. Anlage zum Be­schichten von bahnförmigen Bandblechen.The drawing shows schematically an embodiment of a device or system for coating sheet-like strip sheets.

Wie aus der Zeichnung ersichtlich ist in einer Band­blech-Halte- und Abwickelstation 1 eine Bandrolle 2 drehbar gelagert, von der ein Bandblech 3 abgezogen und mit hoher Geschwindigkeit beispielsweise mit 60 Meter/­Minute durch die einzelnen nachfolgenden Stationen gefördert wird, um dann am Ende als beschichtetes Band in einer Aufwickelstation 4 zu einer Bandrolle aufgewickelt zu werden.As can be seen from the drawing, a band roll 2 is rotatably mounted in a band plate holding and unwinding station 1, from which a band plate 3 is pulled off and conveyed through the individual subsequent stations at high speed, for example at 60 meters / minute, in order to then end up as coated tape in a winding station 4 to be wound into a tape roll.

Das von der Bandrolle 2 abgezogene Bandblech 3 durchläuft zunächst eine Vorbehandlungsstation 5, welche als Durch­laufkammer ausgebildet ist und im Inneren Sprühdüsen 6 aufweist, die wahlweise mit einer Behandlungsflüssigkeit oder einer Spülflüssigkeit beaufschlagt werden können, wobei die Behandlungsflüssigkeit zum Reinigen, Entfetten und Phosphatieren des Bandbleches dient. Im Anschluß an diese Vorbehandlungsstation ist ein Quetschwalzenpaar 7 vorgesehen, um das am Bandblech anhaftende Wasser, welches zum Abspülen der Behandlungssflüssigkeit benötigt wurde, abzuquetschen, bevor das Bandblech 3 in eine Trockenstation 8 einläuft, die als Durchlaufkammer ausgebildet ist und im Inneren Infrarotstrahler 9 sowie Luftausblasedüsen 10 aufweist, um das noch anhaftende Wasser abzutrocknen.The strip 3 pulled off the strip roll 2 first passes through a pretreatment station 5, which is designed as a flow chamber and has spray nozzles 6 on the inside, which can optionally be acted upon with a treatment liquid or a rinsing liquid, the treatment liquid being used for cleaning, degreasing and phosphating the strip plate . Following this pretreatment station, a pair of squeeze rollers 7 is provided in order to squeeze off the water adhering to the strip plate, which was required to rinse off the treatment liquid, before the strip plate 3 runs into a drying station 8, which is designed as a pass-through chamber and has infrared emitters 9 and air-blowing nozzles inside 10 has to dry the still adhering water.

Das so gereinigte, entfettet, phosphatierte und ge­ trocknete Bandblech 3 gelangt dann zu einem Extruder 11, der mit einer Breitschlitzdüse 12 ausgerüstet ist, die unmittlelbar über dem Bandblech 3 mündet und das im Extruder plastifizierte Kunststoffmaterial direkt auf das Bandblech 3 aufträgt.The cleaned, degreased, phosphated and ge Dried sheet metal 3 then arrives at an extruder 11 which is equipped with a slot die 12 which opens directly above the sheet metal 3 and applies the plastic material plasticized in the extruder directly to the sheet metal 3.

Das im fließfähigen Zustand auf das Bandblech 3 un­mittelbar aufgebrachte Kunststoffmaterial wird dann in einer Pulverlackverteil- und Oberflächenglättungsstation 13, die mehrere Walzenpaare 14 aufweist, gleichmäßig verteilt und auf das Bandblech 3 aufgepreßt.The plastic material directly applied to the strip plate 3 in the flowable state is then evenly distributed in a powder coating distribution and surface smoothing station 13, which has a plurality of roller pairs 14, and pressed onto the strip plate 3.

Die Walzenpaare 14 können je nach den vorliegenden Erfordernissen beheizt oder gekühlt sein. Die Temperatur des aus dem Extruder austretenden Kunststoffmaterials liegt dabei knapp unterhalb derjenigen Temperatur, bei welcher der im Material enthaltene Härter zu reagieren beginnt.The roller pairs 14 can be heated or cooled depending on the requirements. The temperature of the plastic material emerging from the extruder is just below the temperature at which the hardener contained in the material begins to react.

Nach dem Verteilen und Aufpressen einer weitgehend gleichmäßigen Pulverlackschicht auf das Bandblech 3, läuft dieses in eine Nachbehandlungs- und Aushärtstation 15, die ebenso wie die Vorbehandlungs- und Trockenstation als tunnelartige Durchlaufskammer ausgebildet ist und in ihrem Inneren Infrarotstrahler 16 aufweist, die die auf das Bandblech 3 aufgebrachte Pulverlackschicht soweit erwärmen, daß diese Schicht in einen noch fließfähigeren Zustand gelangt, wodurch eine vollständig gleichmäßige Verteilung der Pulverlackschicht auf dem Bandblech erzielt wird. Durch die Erhitzung dieser Pulverlack­schicht wird der Härter aktiviert, so daß nach der Verteilung des Pulverlackmaterials dieses aushärtet und trocknet. Anschließend gelangt das Bandblech in eine Kühlstation 17, die ebenfalls als tunnelartige Durchlauf­kammer ausgebildet ist. Hier wird das Bandblech mittels Luft, die aus Ausblasedüsen 18 austritt, gekühlt. Im Anschluß hieran wird das so beschichtete Bandblech in der Aufwickelstation 4 zu einer Bandrolle aufgewickelt, wobei von einer Bandrolle 19 ein Trennpapier abgezogen und zwischen die einzelnen Wicklungen des Bandbleches mit eingewickelt wird, um die aufgebrachte Pulverlackschicht zu schonen.After distributing and pressing a largely uniform layer of powder coating onto the strip 3, it runs into a post-treatment and curing station 15, which, like the pre-treatment and drying station, is designed as a tunnel-like passage chamber and has infrared radiators 16 in its interior, which are applied to the strip 3 heat the applied powder coating layer to such an extent that this layer becomes even more flowable, whereby a completely uniform distribution of the powder coating layer on the strip plate is achieved. The hardening of this powder coating layer activates the hardener, so that after the powder coating material has been distributed, it hardens and dries. The strip plate then arrives in a cooling station 17, which is also designed as a tunnel-like flow chamber. Here, the strip plate is cooled by means of air that emerges from blow-out nozzles 18. Following this, the strip sheet coated in this way is wound up in the winding station 4 to form a roll of tape, a release paper being pulled off a roll of tape 19 and also wrapped between the individual windings of the strip sheet in order to protect the powder coating layer applied.

Claims (13)

1. Verfahren zum beschichten von bahnförmigen Bandblechen mit Pulverlack, die auf eine Bandrolle aufgewickelt sind, dadurch gekennzeichnet, daß das bahnförmige Bandblech von der Rolle abgewickelt und zunächst vorbehandelt und getrocknet wird, daß auf das bewegte Bandblech der Pulverlack in fließfähigem Zustand mit einer Temperatur, die unterhalb der Reaktionstempera­tur des Härters liegt, unmittelbar aufgetragen und auf das Bandblech aufgepreßt wird und daß dann die aufgebrachte Pulverlackschicht durch Wärmeeinwirkung auf eine Temperatur oberhalb der Reaktionstemperatur des Härters gebracht und damit verflüssigt und gleichmäßig verteilt und zum Aushärten gebracht wird, worauf das Bandblech gekühlt und zu einer Bandrolle aufgewickelt wird.1. A process for coating sheet-like strip sheets with powder coating, which are wound onto a roll of tape, characterized in that the sheet-like strip sheet is unwound from the roll and is first pretreated and dried, that the powder coating in the flowable state at a temperature on the moving strip sheet, which is below the reaction temperature of the hardener, is immediately applied and pressed onto the strip plate and that the applied powder coating layer is then brought to a temperature above the reaction temperature of the hardener by the action of heat and thus liquefied and evenly distributed and brought to hardening, whereupon the strip plate is cooled and is wound up into a roll of tape. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das Aufbringen des Pulverlackes direkt mittels eines Extruders auf das Bandblech erfolgt.2. The method according to claim 1, characterized in that the application of the powder coating is carried out directly by means of an extruder on the strip plate. 3. Verfahren nach Anspruch 1 oder 2, dadurch gekenn­zeichnet, daß der aufgebrachte fließfähige Pulverlack durch Walzen auf das Bandblech verteilt und aufgepreßt wird.3. The method according to claim 1 or 2, characterized in that the applied flowable powder coating is distributed by rolling onto the strip plate and pressed becomes. 4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Wärmezufuhr zum Verflüssigen und Aushärten der aufgebrachten Pulverlackschicht durch mittelwellige Infrarotstrahlung erfolgt.4. The method according to any one of claims 1 to 3, characterized in that the heat supply for liquefying and curing the applied powder coating layer is carried out by medium-wave infrared radiation. 5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß beim Aufrollen des beschichteten Bandbleches eine Trennpapierbahn mit aufgewickelt wird.5. The method according to any one of claims 1 to 4, characterized in that when the coated strip sheet is rolled up, a separating paper web is also coiled. 6. Vorrichtung zur Durchführung des Verfahrens nach einem der Ansprüche 1 bis 5, gekennzeichnet durch ein Bandblech-Halte- und Abwickelstation, eine Vorbehand­lungsstation, eine Trockenstation, einen Extruder für den Pulverlack mit direkter Pulverlackauftragung auf das Bandblech mittels einer oder mehrer Düsen, eine Pulverlackverteil- und Oberflächenglättungsstation, eine Nachbehandlungs- und Aushärtestation, eine Kühl­station und eine Bandblechaufwickelstation.6. Device for carrying out the method according to one of claims 1 to 5, characterized by a strip plate holding and unwinding station, a pretreatment station, a drying station, an extruder for the powder coating with direct powder coating application to the strip plate by means of one or more nozzles, a powder coating distribution - And surface smoothing station, a post-treatment and curing station, a cooling station and a strip plate winding station. 7. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, daß zwischen der Vorbehandlungsstation und der Trockenstation Quetschwalzen für das Abführen von Oberflächenwasser vorgesehen sind.7. The device according to claim 6, characterized in that squeeze rollers are provided for the removal of surface water between the pretreatment station and the drying station. 8. Vorrichtung nach Anspruch 6 oder 7, dadurch ge­kennzeichnet, daß die Vorbehandlungsstation eine Durchlaufkammer mit Sprühdüsen aufweist, die wahlweise an eine Quelle mit Reinigungs- oder Behandlungs­flüssigkeit und eine Quelle mit Spülflüssigkeit anschließbar sind.8. The device according to claim 6 or 7, characterized in that the pretreatment station has a flow chamber with spray nozzles, which optionally to a source with cleaning or treatment liquid and a source with rinsing liquid can be connected. 9. Vorrichtung nach einem der Ansprüche 6 bis 8, dadurch gekennzeichnet, daß die Trockenstation eine Durchlauf­kammer mit Infrarotstrahlern und Luftausblasedüsen aufweist.9. Device according to one of claims 6 to 8, characterized in that the drying station has a continuous chamber with infrared radiators and air blowing nozzles. 10. Vorrichtung nach einem der Ansprüche 6 bis 9, dadurch gekennzeichnet, daß der Extruder eine Breitschlitz­düse aufweist, die direkt über dem bewegten Band mündet.10. Device according to one of claims 6 to 9, characterized in that the extruder has a slot die which opens directly above the moving belt. 11. Vorrichtung nach einem der Ansprüche 6 bis 9, dadurch gekennzeichnet, daß der Extruder mehrere nebeneinan­der angeordnete Düsen aufweist, die direkt über dem bewegten Blechband münden.11. Device according to one of claims 6 to 9, characterized in that the extruder has a plurality of nozzles arranged side by side, which open directly above the moving sheet metal strip. 12. Vorrichtung nach einem der Ansprüche 6 bis 11, dadurch gekennzeichnet, daß die Pulverlackverteil- und Oberflächenglättungsstation zumindest ein Walzen­paar aufweist, bei dem die Walzen einander gegenüber­liegend zu beiden Seiten gegen das Bandblech ange­drückt sind.12. The device according to one of claims 6 to 11, characterized in that the powder coating and surface smoothing station has at least one pair of rollers, in which the rollers are pressed opposite each other on both sides against the strip plate. 13. Vorrichtung nach einem der Ansprüche 6 bis 12, dadurch gekennzeichnet, daß die Nachbehandlungs- und Aushärtestation eine Durchlaufkammer mit Infrarot­strahlern aufweist.13. The device according to one of claims 6 to 12, characterized in that the post-treatment and curing station has a continuous chamber with infrared radiators.
EP89121340A 1988-11-17 1989-11-17 Process and apparatus for coating sheet metal with powder paint Revoked EP0369477B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19883838928 DE3838928A1 (en) 1988-11-17 1988-11-17 METHOD FOR COATING SHEET-SHAPED TAPE SHEETS WITH POWDER LACQUER AND DEVICE FOR CARRYING OUT THE METHOD
DE3838928 1988-11-17

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EP0369477A2 true EP0369477A2 (en) 1990-05-23
EP0369477A3 EP0369477A3 (en) 1991-01-23
EP0369477B1 EP0369477B1 (en) 1993-09-29

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WO1996020086A1 (en) * 1994-12-23 1996-07-04 Sms Schloemann-Siemag Aktiengesellschaft Process for coating one or two faces of metallic strips with an extruded duroplastic artificial resin
WO2000015357A2 (en) * 1998-09-16 2000-03-23 Seidner Marc A Polymer fill coating for laminate or composite wood products and method of making same
WO2000071834A3 (en) * 1999-05-26 2001-09-27 Basf Corp Metal roofing shingle stock and method for making it
ES2164607A1 (en) * 1999-07-15 2002-02-16 Hymmen Theodor Method for powder-coating wood panels etc has heating and pressure means to press coating at predetermined pressure onto workpiece
WO2002026406A1 (en) * 2000-09-29 2002-04-04 Advanced Photonics Technologies Ag Method for producing a product from whose surface foreign matter can be removed
KR100309392B1 (en) * 1992-07-08 2002-05-30 리타 버어그스트롬 Coating Process and Coating Composition
EP1255617A1 (en) * 2000-02-08 2002-11-13 Bhp Steel (Jla) Pty. Ltd. A coating method
US6488800B1 (en) 1999-05-07 2002-12-03 Firma Theodor Hynmen Method for changing pulling off a cover web of a production roll to a storing roll
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KR100309392B1 (en) * 1992-07-08 2002-05-30 리타 버어그스트롬 Coating Process and Coating Composition
WO1994001224A3 (en) * 1992-07-08 1994-11-10 Courtaulds Coatings Holdings Coating process and compositions
US5639514A (en) * 1992-07-08 1997-06-17 Courtaulds Coatings (Holdings) Limited Process for coating a metal substrate for packaging end use
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WO1994001224A2 (en) * 1992-07-08 1994-01-20 Courtaulds Coatings (Holdings) Limited Coating process and compositions
WO1996020086A1 (en) * 1994-12-23 1996-07-04 Sms Schloemann-Siemag Aktiengesellschaft Process for coating one or two faces of metallic strips with an extruded duroplastic artificial resin
WO2000015357A2 (en) * 1998-09-16 2000-03-23 Seidner Marc A Polymer fill coating for laminate or composite wood products and method of making same
WO2000015357A3 (en) * 1998-09-16 2000-05-25 Marc A Seidner Polymer fill coating for laminate or composite wood products and method of making same
US6488800B1 (en) 1999-05-07 2002-12-03 Firma Theodor Hynmen Method for changing pulling off a cover web of a production roll to a storing roll
US6485781B2 (en) 1999-05-26 2002-11-26 Basf Corporation Metal roofing shingle stock and method for making it
WO2000071834A3 (en) * 1999-05-26 2001-09-27 Basf Corp Metal roofing shingle stock and method for making it
US6540829B2 (en) 1999-05-26 2003-04-01 Basf Corporation Metal roofing shingle stock and method for making it
AU778541B2 (en) * 1999-05-26 2004-12-09 Basf Corporation Metal roofing shingle stock and method for making it
ES2164607A1 (en) * 1999-07-15 2002-02-16 Hymmen Theodor Method for powder-coating wood panels etc has heating and pressure means to press coating at predetermined pressure onto workpiece
EP1255617A1 (en) * 2000-02-08 2002-11-13 Bhp Steel (Jla) Pty. Ltd. A coating method
EP1255617A4 (en) * 2000-02-08 2003-07-02 Bhp Steel Ltd A coating method
WO2002026406A1 (en) * 2000-09-29 2002-04-04 Advanced Photonics Technologies Ag Method for producing a product from whose surface foreign matter can be removed
WO2006049070A1 (en) 2004-11-01 2006-05-11 Asahi Kasei Chemicals Corporation Easy-to-open bag

Also Published As

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DK575189A (en) 1990-05-18
EP0369477B1 (en) 1993-09-29
DE3838928A1 (en) 1990-05-23
EP0369477A3 (en) 1991-01-23
DK575189D0 (en) 1989-11-16

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