EP0369477B1 - 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
EP0369477B1
EP0369477B1 EP89121340A EP89121340A EP0369477B1 EP 0369477 B1 EP0369477 B1 EP 0369477B1 EP 89121340 A EP89121340 A EP 89121340A EP 89121340 A EP89121340 A EP 89121340A EP 0369477 B1 EP0369477 B1 EP 0369477B1
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EP
European Patent Office
Prior art keywords
station
powder coating
sheet metal
metal strip
extruder
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EP89121340A
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German (de)
French (fr)
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EP0369477A3 (en
EP0369477A2 (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 sheet-like strip sheet being unwound from the roll and first pretreated and dried.
  • the invention also relates to an apparatus for performing the method.
  • thermosetting powder coating solid resin, hardener, coloring pigments, additives and extenders are mixed, plasticized in an extruder and made from the Extruder is applied, whereupon the strand-like material emerging from the extruder 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.
  • 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.
  • thermosetting powder coating in a plasticized, flowable state at a temperature which is below the reaction temperature of the hardener on the moving strip plate. 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 in the case of large bandwidths in the dry powdery state because of the necessary suction, whereby with dry powder coating these difficulties increase with increasing bandwidth and increasing transport speed of the strip plate.
  • the present method thus 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, which 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.
  • a device for carrying out a coating of continuous strip sheets which has a strip sheet holding and unwinding station, a pretreatment station, a drying station, a powder coating and surface smoothing station as well as a cooling station and a strip sheet winding station unwinding, cleaning, pretreating, spraying with powder, melting the dry powder, rolling out the melted layer and then cooling, after which the tape is wound up.
  • thermosetting powder coating in the plasticized, flowable state is applied directly to the moving strip plate at a temperature which is below the reaction temperature of the hardener, and is pressed onto the strip plate, and then the applied powder coating layer is 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 wound up into a strip roll.
  • the powder coating station is an extruder for the thermosetting powder coating with direct powder coating application has in the plasticized state on the strip plate by means of one or more nozzles, and that an aftertreatment and curing station is provided between the powder coating and surface smoothing station and the cooling station.
  • Squeeze rollers for removing 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 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 dried The strip plate 3 then arrives at an extruder 11 which is equipped with a slot die 12 which opens directly above the strip plate 3 and applies the plastic material plasticized in the extruder directly to the strip plate 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 present 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 hardener is activated so that after the powder coating material has been distributed, it hardens and dries.
  • the strip plate 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 plate coated in this way is wound up in the winding station 4 to form a strip roll, a release paper being pulled off a strip roll 19 and also wrapped between the individual windings of the strip plate in order to protect the powder coating layer applied.

Description

Die Erfindung bezieht sich auf ein Verfahren zum Beschichten von bahnförmigen Bandblechen mit Pulverlack, die auf eine Bandrolle aufgewickelt sind, wobei das bahnförmige Bandblech von der Rolle abgewickelt und zunächst vorbehandelt und getrocknet wird. 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 sheet-like strip sheet being unwound from the roll and first pretreated and dried. 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 duroplastischem 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.To produce thermosetting powder coating, solid resin, hardener, coloring pigments, additives and extenders are mixed, plasticized in an extruder and made from the Extruder is applied, whereupon the strand-like material emerging from the extruder 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.

Aus der DE-A-27 06 328 ist es bekannt, endlose Bänder mit thermoplastischem Pulverlack zu beschichten. Dabei wird das endlose Band von einer Bandrolle abgewickelt, gereinigt und mit einem lösungsmittelhaltigen Haftvermittler durch Aufsprühen beschichtet, worauf das so vorbehandelte Band getrocknet und anschließend im noch warmen Zustand einseitig mit einem thermoplastischen Kunststoff, vorzugsweise durch elektrostatisches Besprühen beschichtet wird. Nachfolgend wird durch Hitzeeinwirkung das anhaftende Pulver geschmolzen und duch Walzen auf das erforderliche Dickenmaß gewalzt, worauf das Band gekühlt wird. Bei der Beschichtung von endlosen Bändern müssen, wenn eine rationelle Fertigung angestrebt werden soll, sehr viele Pulversprühpistolen eingesetzt werden. Dies gilt sowohl für thermoplastischen als auch für duroplastischen Pulverlack. Die aus dem 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.From DE-A-27 06 328 it is known to coat endless tapes with thermoplastic powder coating. The endless strip is unwound from a roll of tape, cleaned and coated with a solvent-based adhesion promoter by spraying, whereupon the strip pretreated in this way is dried and then coated on one side with a thermoplastic material, preferably by electrostatic spraying, while still warm. Subsequently, the adhering powder is melted by the action of heat and rolled to the required thickness by rolling, after which the strip is cooled. When coating endless belts, a lot of powder spray guns have to be used if rational production is to be aimed at. This applies to both thermoplastic and thermosetting powder coating. 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 because of the high suction speed required.

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

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 ausgehend von dem eingangs erläuterten Verfahren erfindungsgemäß dadurch gelöst, daß auf das bewegte Bandblech duroplastischer Pulverlack in plastifiziertem, 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 on the basis of the method explained at the outset in that thermosetting powder coating in a plasticized, flowable state at a temperature which is below the reaction temperature of the hardener on the moving strip plate. 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 in the case of large bandwidths in the dry powdery state because of the necessary suction, whereby with 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 thus 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, which 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.

Aus der DE-A-27 06 328 ist eine Vorrichtung zur Durchführung einer Beschichtung von endlosen Bandblechen bekannt, die eine Bandblech-Halte- und Abwickelstation, eine Vorbehandlungsstation, eine Trockenstation, eine Pulverlackverteil- und Oberflächenglättungsstation sowie eine Kühlstation und eine Bandblechaufwickelstation aufweist, um das Band abzuwickeln, zu reinigen, vorzubehandeln, mit Pulver zu besprühen, das trockene Pulver zum Schmelzen zu bringen, die geschmolzene Schicht auszuwalzen und anschließend zu kühlen, worauf dann das Band aufgewickelt wird. Ausgehend von dieser bekannten Vorrichtung ist für die Durchführung des erfindungsgemäßen Verfahrens vorgesehen, daß auf das bewegte Bandblech duroplastischer Pulverlack in plastifiziertem, 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. Um diese Verfahrensschritte durchführen zu können, ist ausgehend von der bekannten Vorrichtung vorgesehen, daß die Pulverlackstation einen Extruder für den duroplastischen Pulverlack mit direkter Pulverlackauftragung im plastifizierten Zustand auf das Bandblech mittels einer oder mehrerer Düsen aufweist, und daß zwischen der Pulverlackverteil- und Oberflächenglättungsstation und der Kühlstation eine Nachbehandlungs- und Aushärtestation vorgesehen ist.From DE-A-27 06 328 a device for carrying out a coating of continuous strip sheets is known, which has a strip sheet holding and unwinding station, a pretreatment station, a drying station, a powder coating and surface smoothing station as well as a cooling station and a strip sheet winding station unwinding, cleaning, pretreating, spraying with powder, melting the dry powder, rolling out the melted layer and then cooling, after which the tape is wound up. Starting from this known device, it is provided for the implementation of the method according to the invention that thermosetting powder coating in the plasticized, flowable state is applied directly to the moving strip plate at a temperature which is below the reaction temperature of the hardener, and is pressed onto the strip plate, and then the applied powder coating layer is 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 wound up into a strip roll. In order to be able to carry out these process steps, it is provided on the basis of the known device that the powder coating station is an extruder for the thermosetting powder coating with direct powder coating application has in the plasticized state on the strip plate by means of one or more nozzles, and that an aftertreatment and curing station is provided between the powder coating and surface smoothing station and the cooling station.

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

Die Vorbehandlungsstation weist eine Durchlaufkammer 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 is degreased, cleaned, rinsed and phosphated.

Die Trockenstation weist in vorteilhafter Ausgestalt 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 getrocknete 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 dried The strip plate 3 then arrives at an extruder 11 which is equipped with a slot die 12 which opens directly above the strip plate 3 and applies the plastic material plasticized in the extruder directly to the strip plate 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 present 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. By heating this powder coating layer, the hardener is activated 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 plate coated in this way is wound up in the winding station 4 to form a strip roll, a release paper being pulled off a strip roll 19 and also wrapped between the individual windings of the strip plate in order to protect the powder coating layer applied.

Claims (13)

  1. Process for coating sheet metal strips wound on to a reel with a powder coating, the sheet metal strip being unwound from the reel and first pretreated and dried, characterised in that a free-flowing plasticised thermoset powder coating is applied directly to the moving sheet metal strip at a temperature below the reaction temperature of the hardener and is pressed on to the sheet metal strip and that the powder coating applied is then brought to a temperature above the reaction temperature of the hardener by the influence of heat and thus is liquefied and distributed in a uniform manner and hardened, after which the sheet metal strip is cooled and wound on to a reel.
  2. Process according to claim 1, characterised in that the powder coating is applied directly to the sheet metal strip by means of an extruder.
  3. Process according to claim 1 or claim 2, characterised in that the free-flowing powder coating applied is distributed over and pressed on to the sheet metal strip by rolling.
  4. Process according to one of claims 1 to 3, characterised in that the heat for liquefying and hardening the powder coating applied is applied by means of medium-wave infrared radiation.
  5. Process according to one of claims 1 to 4, characterised in that a web of interleaving paper is also wound on when rolling up the coated sheet metal strip.
  6. Apparatus for carrying out the process according to one of claims 1 to 5, comprising a sheet metal strip holding and unwinding station (1), a pretreatment station (5), a drying station (8), a powder coating application station (11), a powder coating distribution and surface smoothing station (13), a cooling station (17) and a sheet metal strip winding station (4), characterised in that the powder coating application station has an extruder (11) for the thermoset powder coating with direct application of the plasticised powder coating to the sheet metal strip (3) by means of one or more nozzles (12), and that a subsequent treatment and hardening station (15) is provided between the powder coating distribution and surface smoothing station (13) and the cooling station (17).
  7. Apparatus according to claim 6, characterised in that squeezing rolls (7) for the removal of surface water are provided between the pretreatment station (5) and the drying station (8).
  8. Apparatus according to claim 6 or claim 7, characterised in that the pretreatment station (5) has a tunnel-type chamber with spray nozzles (6) which can be connected selectively to a source with cleaning or treatment liquid and a source with rinsing liquid.
  9. Apparatus according to one of claims 6 to 8, characterised in that the drying station (8) has a tunnel-type chamber with infrared radiators (9) and air-blowing nozzles (10).
  10. Apparatus according to one of claims 6 to 9, characterised in that the extruder (11) has a flat sheeting nozzle (12) which opens directly above the moving sheet metal strip (3).
  11. Apparatus according to one of claims 6 to 9, characterised in that the extruder (11) has a plurality of nozzles arranged alongside one another and opening directly above the moving sheet metal strip (3).
  12. Apparatus according to one of claims 6 to 11, characterised in that the powder coating distribution and surface smoothing station (13) has at least one pair of rolls (14), in which the rolls are pressed against the sheet metal strip (3) on either side opposite one another.
  13. Apparatus according to one of claims 6 to 12, characterised in that the subsequent treatment and hardening station (15) has a tunnel-type chamber with infrared radiators (16).
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
DE3838928 1988-11-17
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

Publications (3)

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

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EP89121340A Revoked EP0369477B1 (en) 1988-11-17 1989-11-17 Process and apparatus for coating sheet metal with powder paint

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EP (1) EP0369477B1 (en)
DE (1) DE3838928A1 (en)
DK (1) DK575189A (en)

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US8367978B2 (en) 2006-10-05 2013-02-05 Magna International Inc. Hybrid infrared convection paint baking oven and method of using the same
KR101353241B1 (en) 2011-12-28 2014-01-20 주식회사 포스코 Continuous resin coating method directly connected to processing metal strips in high speed and continuous resin coating system using the same
US11229925B2 (en) 2020-03-12 2022-01-25 Ayotte Techno-Gaz Inc. System and process for curing a wet coating applied to a substrate

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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
DE29702967U1 (en) * 1997-02-20 1997-05-07 Vollmer Harald Device for producing a marble-like surface imitation, in particular for powder-coated metallic surfaces
US6309492B1 (en) * 1998-09-16 2001-10-30 Marc A. Seidner Polymer fill coating for laminate or composite wood products and method of making same
DE19921041A1 (en) 1999-05-07 2000-11-09 Hymmen Theodor Gmbh Manufacture process for chipboard panels involves change of decor roll and cover web effected without interruption of band press
DE60030683T2 (en) * 1999-05-26 2007-09-06 Basf Corp., Southfield METAL ROOF SHEET PRESERVE AND METHOD FOR THE PRODUCTION THEREOF
DE19933100A1 (en) * 1999-07-15 2001-01-18 Hymmen Theodor Gmbh Method for powder-coating wood panels etc has heating and pressure means to press coating at predetermined pressure onto workpiece
DE19962021A1 (en) * 1999-12-22 2001-06-28 Volkswagen Ag Powder coating method for e.g. motor vehicle industry with application of powder medium, pre-drying process, and cross-linking
AUPQ549000A0 (en) * 2000-02-08 2000-03-02 Bhp Steel (Jla) Pty Limited Coating method
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US8367978B2 (en) 2006-10-05 2013-02-05 Magna International Inc. Hybrid infrared convection paint baking oven and method of using the same
KR101353241B1 (en) 2011-12-28 2014-01-20 주식회사 포스코 Continuous resin coating method directly connected to processing metal strips in high speed and continuous resin coating system using the same
US11229925B2 (en) 2020-03-12 2022-01-25 Ayotte Techno-Gaz Inc. System and process for curing a wet coating applied to a substrate

Also Published As

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DK575189A (en) 1990-05-18
DE3838928A1 (en) 1990-05-23
EP0369477A3 (en) 1991-01-23
DK575189D0 (en) 1989-11-16
EP0369477A2 (en) 1990-05-23

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