EP0431711A1 - Process and apparatus for anodic or cathodic painting of hollow bodies, particularly cans, by electrophoresis - Google Patents

Process and apparatus for anodic or cathodic painting of hollow bodies, particularly cans, by electrophoresis Download PDF

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Publication number
EP0431711A1
EP0431711A1 EP90250283A EP90250283A EP0431711A1 EP 0431711 A1 EP0431711 A1 EP 0431711A1 EP 90250283 A EP90250283 A EP 90250283A EP 90250283 A EP90250283 A EP 90250283A EP 0431711 A1 EP0431711 A1 EP 0431711A1
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EP
European Patent Office
Prior art keywords
hollow body
housing
grid
paint
nozzle tubes
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP90250283A
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German (de)
French (fr)
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EP0431711B1 (en
Inventor
Karsten Ing. Loeck
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PLM Berlin Dosenwerk GmbH
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PLM Berlin Dosenwerk GmbH
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Filing date
Publication date
Priority claimed from DE19893938363 external-priority patent/DE3938363A1/en
Priority claimed from DE19904005619 external-priority patent/DE4005619A1/en
Priority claimed from DE19904005622 external-priority patent/DE4005622A1/en
Priority claimed from DE19904005620 external-priority patent/DE4005620A1/en
Application filed by PLM Berlin Dosenwerk GmbH filed Critical PLM Berlin Dosenwerk GmbH
Priority to AT90250283T priority Critical patent/ATE96476T1/en
Publication of EP0431711A1 publication Critical patent/EP0431711A1/en
Application granted granted Critical
Publication of EP0431711B1 publication Critical patent/EP0431711B1/en
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    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D13/00—Electrophoretic coating characterised by the process
    • C25D13/12—Electrophoretic coating characterised by the process characterised by the article coated
    • C25D13/14—Tubes; Rings; Hollow bodies

Definitions

  • the invention relates to a method and devices for anodic or cathodic electro-coating of hollow bodies, in particular cans, such as beverage cans or the like, by means of a water-soluble lacquer as an electrolytic liquid, which contacts with the cathode or anode and in at least one uninterrupted, producing a conductive connection Beam is directed onto the surfaces of the hollow body forming the anode or cathode.
  • the invention has for its object to provide a method of the type mentioned, which allows the anodic or cathodic electro-painting of hollow bodies, in particular cans, to be carried out in large numbers per unit of time and does not require a technically complex coating device.
  • a device for carrying out the method for cathodic electrodeposition essentially corresponds to the device for anodic electrodeposition according to the invention, however, in addition to its features, it has a dialysis circuit guided through the housing.
  • the housing is divided into an upper interior and a lower interior by means of a membrane, the upper interior communicating with the nozzle tubes and with at least one paint supply line, and the lower interior containing a large-area electrode forming the anode and via an anolyte supply line and anolyte discharge line is connected to the dialysis circuit.
  • a metallic hollow body 1 here a beverage can, is placed on the bars 4 with the bottom 2 upwards and the opening 3 downwards.
  • the latter are arranged upright next to each other and at a distance parallel to each other and held by means of spacers 6 and grub screws with nuts 7.
  • the upper sides 5 of the lattice bars 4 supporting the hollow body 1 are designed in a cutting-like manner so that a practically punctiform contact takes place between the edge of the opening 3 of the hollow body 1 and the lattice bars 4, which ensures very good electrical contact.
  • the hollow body 1, of which only one is shown here for the sake of clarity, are pushed in the direction of arrow K along the cutting-like upper sides 5 of the bars 4, as a result of which remnants of lacquer are constantly scraped off and thus always have a metallic contact between the opening edge of the hollow body 1 and the bars 4 is guaranteed.
  • the latter together with the hollow bodies 1 form the anode.
  • a housing 9, which forms the cathode and is located below the grid 4 has a plurality of nozzle tubes 8 arranged vertically thereon, which open out in the intermediate space and in the region of the upper edge 5 of the grid bars 4.
  • the housing 9 consists of an upper part 9a having a circumferential flange 13 and a lower part 9b having a circumferential flange 14, which are connected to one another by means of screws (not shown) inserted into bores 15 of the flanges 13, 14.
  • the housing 9 is connected to the nozzle tubes 8 and an electrolyte feed line 16a.
  • an electrolyte return line 16b is provided, so that a circulation in the circuit is possible for excess paint or electrolyte liquid which does not emerge from the nozzle tubes 8.
  • a large-area electrode Arranged in the interior of the housing 9 is a large-area electrode, not shown, which makes the housing 9 a cathode and is connected to the corresponding pole of a DC voltage source. The bars 4 are connected to the other pole of this DC voltage source.
  • the device shown in FIG. 2 corresponds essentially to the structure of the device according to FIG. 1, which is why the same parts are provided with the same reference numerals here. Since the device for carrying out the method for cathodic electrodeposition is provided, it has a dialysis circuit guided through the housing 9. For this purpose, as FIGS. 3 and 4 show, a membrane 12 is arranged in the housing 9 between the flanges 13 and 14 and divides the housing 9 into an upper interior 10 and a lower interior 11.
  • the upper interior 10 stands with the nozzle tubes 8, and with a paint feed line 16 and a paint drain 20 in connection, while the lower interior 12 has an anolyte feed 17 and an anolyte drain 18.
  • the partial view of the housing 9 shown in FIG. 5 shows that a cylindrical helical spring 21 or 21a is inserted into the nozzle tubes 8, whereby adjacent nozzle tubes 8 are alternately provided with a clockwise and a counterclockwise spring. By means of this spring it is caused that the paint jets rising from the nozzle tubes 8 rotate about their own axis. Practical tests have shown that an extremely rapid filling of the interior of the hollow body can be achieved if the hollow body 1 which is pushed over the lattice bars stands on at least three bars, i.e. the interior of the hollow body is acted upon by at least two oppositely rotating paint jets.
  • FIG. 6 illustrates in a partial representation the arrangement of the means used to move and guide the hollow body 1.
  • a hollow body 1 is shown here again. It is driven by a screw conveyor 22 in the direction of arrow K with the Opening 3 shifted downward on the bars 4, being guided by a guide bar 23 on the side facing away from the screw conveyor 22.
  • a hold-down bar 24 is arranged above the hollow body 1, which ensures that it is not lifted off the bars 4 by the rising paint jets.
  • its outer surface is also flooded and coated by the paint emerging from the nozzle tubes 8.
  • FIGS. 1, 2 and 6 represent only a section of an overall system, the grids 4 of which are used to move a large number of hollow bodies arranged one behind the other and side by side with the opening facing downward in the direction of arrow K.
  • the overall system is constructed in a known manner and comprises a conveyor system by means of which the hollow bodies to be coated are pretreated by a pretreatment system for cleaning, degreasing and generating conversion layers, furthermore by a rinsing zone, a dryer and finally after coating again by a rinsing zone and a dryer and one Paint baking oven can be transported.

Abstract

The invention relates to a process and an apparatus for anodic or cathodic painting of hollow bodies, particularly cans such as drink cans or the like, using a water-soluble paint as electrolyte liquid. The latter is in contact with the cathode or anode and is fed in at least one uninterrupted jet, which produces a conducting connection, to the surfaces of the hollow body which form the anode or cathode. <??>In order to be able to coat hollow bodies in large numbers per unit time with such a process, the invention proposes that the hollow bodies (1) are pushed with the opening (3) down over an electrically conducting grid (4), the paint being flooded in or over the hollow bodies in jets rising up through the free spaces between the grid or grating rods from below and the entire inside and outside surface of the hollow bodies being covered with a continuous layer in the process. <IMAGE>

Description

Die Erfindung betrifft ein Verfahren und Vorrichtungen zum anodischen oder kathodischen Elektrolackieren von Hohlkörpern, insbesondere von Dosen, wie Getränkedosen o. dgl., mittels eines wasserlöslichen Lacks als Elektrolytflüssigkeit, die mit der Kathode oder Anode kontaktiert und in mindestens einem ununterbrochenen, eine leitende Verbindung herstellenden Strahl auf die die Anode oder Kathode bildenden Oberflächen der Hohlkörper geleitet wird.The invention relates to a method and devices for anodic or cathodic electro-coating of hollow bodies, in particular cans, such as beverage cans or the like, by means of a water-soluble lacquer as an electrolytic liquid, which contacts with the cathode or anode and in at least one uninterrupted, producing a conductive connection Beam is directed onto the surfaces of the hollow body forming the anode or cathode.

Verfahren dieser Art und ebenso Vorrichtungen zu deren Durchführung sind bekannt. Die elektrophoetische Aufbringung des Beschichtungsmaterials wurde bisher im Sprüh-, Tauch- oder im Überflutungsverfahren durchgeführt. Die dazu erforderlichen Vorrichtungen sind konstruktiv relativ aufwendig, um die erforderliche ununterbrochene leitende Verbindung zwischen dem Lack und der damit zu beschichtenden Materialoberfläche herzustellen (siehe z.B. DE-AS 26 33 179 und DE-OS 25 48 414). Bei den bekannten Beschichtungsverfahren ist es ferner als nachteilig anzusehen, daß die Beschichtungszeit je Materialstück ziemlich lang ist, was dazu führt, daß in einer Fertigungsstraße, z.B. für Getränkedosen, einer Dosenherstellungsmaschine mehrere parallel arbeitende Beschichtungsvorrichtungen nachgeschaltet sein müssen.Methods of this type and also devices for their implementation are known. The electrophoetic application of the coating material has hitherto been carried out by spraying, dipping or flooding. The devices required for this are structurally relatively complex to produce the required continuous conductive connection between the paint and the material surface to be coated with it (see, for example, DE-AS 26 33 179 and DE-OS 25 48 414). It is with the known coating processes also to be regarded as disadvantageous that the coating time per piece of material is rather long, which means that in a production line, for example for beverage cans, a can manufacturing machine must have several coating devices operating in parallel.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren der eingangs genannten Art zu schaffen, das das anodische oder kathodische Elektrolackieren von Hohlkörpern, insbesondere von Dosen, in hoher Stückzahl pro Zeiteinheit durchzuführen gestattet und dafür keine technisch aufwendige Beschichtungsvorrichtung benötigt.The invention has for its object to provide a method of the type mentioned, which allows the anodic or cathodic electro-painting of hollow bodies, in particular cans, to be carried out in large numbers per unit of time and does not require a technically complex coating device.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß die zu beschichtenden Hohlkörper mit der Öffnung nach unten über ein elektrisch leitendes Gitter oder Rost geschoben werden, wobei der Lack durch die freien Zwischenräume den Gitter- bzw. Roststäbe in von unten aufsteigenden Strahlen in bzw. über die Hohlkörper gespült wird und dabei deren gesamte Innen- und Außenoberfläche mit einer ununterbrochenen Schicht bedeckt wird.
Die weitere Ausbildung des Verfahrens geht aus den Unteransprüchen 2-7 hervor.This object is achieved in that the hollow body to be coated is pushed with the opening down over an electrically conductive grid or grate, the paint through the free spaces between the grate or grate bars in rays rising from below into or over the Hollow body is rinsed and the entire inner and outer surface is covered with an uninterrupted layer.
The further development of the method is evident from subclaims 2-7.

Eine Vorrichtung zur Durchführung des Verfahrens zum anodischen Elektrolackieren ist gekennzeichnet durch folgende Merkmale:

  • a) ein die zu lackierenden Hohlkörper tragendes Gitter, das mit den Hohlkörpern die Anode bildet,
  • b) ein die Kathode bildendes, unterhalb des Gitters befindliches Gehäuse mit darauf angeordneten Düsenröhren, die im Zwischenraum. und im Bereich der Oberkante der Gitterstäbe münden,
  • c) eine Auffangwanne, über der sich das Gehäuse und das Gitter befinden und die Bestandteil eines über das Gehäuse und die Düsenröhren geführten Lack-Kreislaufes ist, der in bekannter Weise eine Umwälzpumpe, einen Filter, gegebenenfalls einen Kühler und einen Vorratsbehälter aufweist.
A device for carrying out the method for anodic electro-painting is characterized by the following features:
  • a) a grid carrying the hollow bodies to be painted, which forms the anode with the hollow bodies,
  • b) a housing forming the cathode, located below the grid, with nozzle tubes arranged thereon, in the intermediate space. and open in the area of the upper edge of the bars,
  • c) a drip pan, above which the housing and the grille are located and which is part of a paint circuit guided over the housing and the nozzle tubes, which in a known manner has a circulation pump, a filter, optionally a cooler and a storage container.

Eine Vorrichtung zur Durchführung des Verfahrens zum kathodischen Elektrolackieren entspricht im wesentlichen der erfindungsgemäßen Vorrichtung zum anodischen Elektrolackieren, weist jedoch zusätzlich zu deren Merkmalen einen durch das Gehäuse geführten Dialysekreislauf auf. Dabei ist das Gehäuse mittels einer Membran in einen oberen Innenraum und einen unteren Innenraum unterteilt, wobei der obere Innenraum mit den Düsenröhren und mit mindestens einer Lackzuleitung in Verbindung steht und der untere Innenraum eine die Anode bildende großflächige Elektrode enthält und über eine Anolytzuleitung und Anolytableitung mit dem Dialysekreislauf verbunden ist.A device for carrying out the method for cathodic electrodeposition essentially corresponds to the device for anodic electrodeposition according to the invention, however, in addition to its features, it has a dialysis circuit guided through the housing. The housing is divided into an upper interior and a lower interior by means of a membrane, the upper interior communicating with the nozzle tubes and with at least one paint supply line, and the lower interior containing a large-area electrode forming the anode and via an anolyte supply line and anolyte discharge line is connected to the dialysis circuit.

Weitere Vorrichtungsmerkmale, die sowohl die Vorrichtung zum anodischen als auch zum kathodischen Elektrolackieren betreffen, gehen aus den Unteransprüchen 12-17 hervor.Further device features, which relate to both the device for anodic and for cathodic electrodeposition, emerge from subclaims 12-17.

Die mit der Erfindung erzielten Vorteile bestehen insbesondere darin, daß das Verfahren in Verbindung mit den vorgeschlagenen Vorrichtungen ein außerordentlich schnelles und wirtschaftliches Elektrolackieren von Hohlkörpern gestattet. Praktische Versuche haben gezeigt, daß das Verfahren zu einer erheblichen Einsparung von Lack führt (ca. 30-40%). Damit verbunden ist ein geringerer Lösungsmittelverbrauch, ferner die Einsparung von Energie, insbesondere von für das Trocknen benötigter Wärmeenergie. Das Verfahren verbindet also höchsten wirtschaftlichen Nutzen mit geringer Umweltbelastung.The advantages achieved by the invention consist, in particular, in the fact that the method in connection with the proposed devices allows an extremely quick and economical electro-painting of hollow bodies. Practical tests have shown that the process leads to a considerable saving in paint (approx. 30-40%). This is associated with lower solvent consumption and also the saving of energy, in particular of the thermal energy required for drying. The process therefore combines maximum economic benefit with low environmental impact.

Ausführungsbeispiele von Vorrichtungen zur Durchführung des Verfahrens sind in der Zeichnung dargestellt und werden nachstehend unter gleichzeitiger Erläuterung des Verfahrens beschrieben. Es zeigen

  • Fig. 1 eine perspektivische Ansicht einer Beschichtungsvorrichtung, die Teil einer Anlage zum anodischen Elektrolackieren ist,
  • Fig. 2 eine der Fig. 1 entsprechende Darstellung einer Vorrichtung zum kathodischen Elektrolackieren,
  • Fig. 3 eine vergrößerte Seitenansicht einer Einzelheit aus Fig. 2,
  • Fig. 4 einen Schnitt entlang der Linie 3 in Fig. 3,
  • Fig. 5 eine teilweise geschnittene Teilansicht der Fig. 3 und
  • Fig. 6 einen Ausschnitt aus Fig. 1 bzw. Fig. 2, in den die zur Verschiebung und Führung der Hohlkörper dienenden Mittel eingezeichnet sind.
Exemplary embodiments of devices for carrying out the method are shown in the drawing and are described below with simultaneous explanation of the method. Show it
  • 1 is a perspective view of a coating device, which is part of a system for anodic electro painting,
  • 2 shows a representation corresponding to FIG. 1 of a device for cathodic electro-painting,
  • 3 is an enlarged side view of a detail from FIG. 2,
  • 4 shows a section along line 3 in FIG. 3,
  • Fig. 5 is a partially sectioned partial view of Fig. 3 and
  • FIG. 6 shows a detail from FIG. 1 or FIG. 2, in which the means used for displacing and guiding the hollow bodies are drawn.

Gemäß Fig. 1 ist ein metallischer Hohlkörper 1, hier eine Getränkedose, mit dem Boden 2 nach oben und der Öffnung 3 nach unten auf Gitterstäbe 4 aufgesetzt. Letztere sind hochkant nebeneinander und mit Abstand parallel zueinander angeordnet und mittels Abstandshaltern 6 und Gewindestiften mit Muttern 7 gehalten. Die den Hohlkörper 1 unterstützenden Oberseiten 5 der Gitterstäbe 4 sind schneidenartig ausgebildet, so daß zwischen dem Rand der Öffnung 3 des Hohlkörpers 1 und den Gitterstäben 4 eine praktisch punktförmige Berührung stattfindet, die einen sehr guten elektrischen Kontakt gewährleistet. Die Hohlkörper 1, von denen aus Gründen der Übersichtlichkeit hier nur einer dargestellt ist, werden in Richtung des Pfeiles K auf den schneidenartig ausgebildeten Oberseiten 5 der Gitterstäbe 4 entlang geschoben, wodurch sich anlagernde Lackreste ständig abgeschabt werden und somit stets eine metallische Berührung zwischen dem Öffnungsrand des Hohlkörpers 1 und den Gitterstäben 4 gewährleistet ist. Letztere bilden zusammen mit den Hohlkörpern 1 die Anode. Ein die Kathode bildendes, unterhalb des Gitters 4 befindliches Gehäuse 9 weist mehrere senkrecht darauf angeordnete Düsenröhren 8 auf, die im Zwischenraum und im Bereich der Oberkante 5 der Gitterstäbe 4 münden. Unter den Gitterstäben 4 und dem Gehäuse 9 befindet sich eine Auffangwanne 10, die Bestandteil eines über das Gehäuse 9 und die Düsenröhren 8 geführten Lack-Kreislaufes ist, der in bekannter - und deshalb hier nicht dargestellter - Weise eine Umwälzpumpe, einen Filter, gegebenenfalls einen Kühler und einen Vorratsbehälter aufweist.
Das Gehäuse 9 besteht aus einem einen umlaufenden Flansch 13 aufweisenden Oberteil 9a und einem einen umlaufenden Flansch 14 aufweisenden Unterteil 9b, die miteinander mittels in Bohrungen 15 der Flansche 13, 14 gesteckter, nicht dargestellter Schrauben verbunden sind.
Das Gehäuse 9 steht mit den Düsenröhren 8 und einer Elektrolytzuleitung 16a in Verbindung. Ferner ist eine Elektrolytrückleitung 16b vorgesehen, so daß für überschüssigen, nicht aus den Düsenröhren 8 austretender Lack bzw. Elektrolytflüssigkeit eine Umwälzung im Kreislauf möglich ist.
Im Innenraum des Gehäuses 9 ist eine nichtdargestellte großflächige Elektrode angeordnet, die das Gehäuse 9 zur Kathode macht und mit dem entsprechenden Pol einer Gleichspannungsquelle verbunden ist. Die Gitterstäbe 4 sind entsprechend mit dem anderen Pol dieser Gleichspannungsquelle verbunden.1, a metallic hollow body 1, here a beverage can, is placed on the bars 4 with the bottom 2 upwards and the opening 3 downwards. The latter are arranged upright next to each other and at a distance parallel to each other and held by means of spacers 6 and grub screws with nuts 7. The upper sides 5 of the lattice bars 4 supporting the hollow body 1 are designed in a cutting-like manner so that a practically punctiform contact takes place between the edge of the opening 3 of the hollow body 1 and the lattice bars 4, which ensures very good electrical contact. The hollow body 1, of which only one is shown here for the sake of clarity, are pushed in the direction of arrow K along the cutting-like upper sides 5 of the bars 4, as a result of which remnants of lacquer are constantly scraped off and thus always have a metallic contact between the opening edge of the hollow body 1 and the bars 4 is guaranteed. The latter together with the hollow bodies 1 form the anode. A housing 9, which forms the cathode and is located below the grid 4, has a plurality of nozzle tubes 8 arranged vertically thereon, which open out in the intermediate space and in the region of the upper edge 5 of the grid bars 4. Under the bars 4 and the housing 9 there is a collecting trough 10, which is part of a paint circuit guided over the housing 9 and the nozzle tubes 8, which in a known - and therefore not shown here - manner a circulation pump, one Filters, optionally a cooler and a storage container.
The housing 9 consists of an upper part 9a having a circumferential flange 13 and a lower part 9b having a circumferential flange 14, which are connected to one another by means of screws (not shown) inserted into bores 15 of the flanges 13, 14.
The housing 9 is connected to the nozzle tubes 8 and an electrolyte feed line 16a. Furthermore, an electrolyte return line 16b is provided, so that a circulation in the circuit is possible for excess paint or electrolyte liquid which does not emerge from the nozzle tubes 8.
Arranged in the interior of the housing 9 is a large-area electrode, not shown, which makes the housing 9 a cathode and is connected to the corresponding pole of a DC voltage source. The bars 4 are connected to the other pole of this DC voltage source.

Die in Fig. 2 dargestellte Vorrichtung entspricht im wesentlichen Aufbau der Vorrichtung gemäß Fig. 1, weshalb hier dieselben Teile mit denselben Bezugszeichen versehen sind. Da die Vorrichtung zur Durchführung des Verfahrens zum kathodischen Elektrolackieren vorgesehen ist, weist sie einen durch das Gehäuse 9 geführten Dialysekreislauf auf. Zu diesem Zwecke ist, wie die Fig. 3 und 4 zeigen, im Gehäuse 9 zwischen den Flanschen 13 und 14 eine Membran 12 angeordnet, die das Gehäuse 9 in einen oberen Innenraum 10 und einen unteren Innenraum 11 unterteilt. Der obere Innenraum 10 steht mit den Düsenröhren 8, sowie mit einer Lackzuleitung 16 und einer Lackableitung 20 in Verbindung, während der untere Innenraum 12 eine Anolytzuleitung 17 und eine Anolytableitung 18 aufweist. Diese Leitungen 17, 18 sind mit einem hier nicht dargestellten Dialysekreislauf verbunden, der dazu dient, die an der Anode gebildeten Säurereste zu entfernen.
Im unteren Innenraum 11 ist eine großflächige Elektrode 19 angeordnet, die in nicht dargestellter Weise in elektrischer Verbindung mit dem Pluspol einer Gleichspannungsquelle steht. Die Gitterstäbe 4 sind entsprechend mit dem Minuspol dieser nicht dargestellten Gleichspannungsquelle verbunden.The device shown in FIG. 2 corresponds essentially to the structure of the device according to FIG. 1, which is why the same parts are provided with the same reference numerals here. Since the device for carrying out the method for cathodic electrodeposition is provided, it has a dialysis circuit guided through the housing 9. For this purpose, as FIGS. 3 and 4 show, a membrane 12 is arranged in the housing 9 between the flanges 13 and 14 and divides the housing 9 into an upper interior 10 and a lower interior 11. The upper interior 10 stands with the nozzle tubes 8, and with a paint feed line 16 and a paint drain 20 in connection, while the lower interior 12 has an anolyte feed 17 and an anolyte drain 18. These lines 17, 18 are connected to a dialysis circuit, not shown here, which serves to remove the acid residues formed on the anode.
Arranged in the lower interior 11 is a large-area electrode 19, which is not shown in electrical connection with the positive pole of a DC voltage source. The bars 4 are connected to the negative pole of this DC voltage source, not shown.

Die in der Fig. 5 gezeigte Teildarstellung des Gehäuses 9 zeigt, daß in die Düsenröhren 8 je eine zylindrische Schraubenfeder 21 bzw. 21a eingesetzt ist, wobei benachbarte Düsenröhren 8 abwechselnd mit einer rechtsdrehenden und einer linksdrehenden Feder versehen sind. Mittels dieser Feder wird bewirkt, daß die aus den Düsenröhren 8 aufsteigenden Lackstrahlen sich um ihre eigene Achse drehen. Praktische Versuch haben gezeigt, daß sich eine außerordentlich schnelle Befüllung des Hohlkörperinneren erzielen läßt, wenn der über der die Gitterstäbe geschobene Hohlkörper 1 auf mindestens drei Stäben aufsteht, d.h. der Hohlkörperinnenraum von mindestens zwei sich gegenläufig drehenden Lackstrahlen beaufschlagt wird.The partial view of the housing 9 shown in FIG. 5 shows that a cylindrical helical spring 21 or 21a is inserted into the nozzle tubes 8, whereby adjacent nozzle tubes 8 are alternately provided with a clockwise and a counterclockwise spring. By means of this spring it is caused that the paint jets rising from the nozzle tubes 8 rotate about their own axis. Practical tests have shown that an extremely rapid filling of the interior of the hollow body can be achieved if the hollow body 1 which is pushed over the lattice bars stands on at least three bars, i.e. the interior of the hollow body is acted upon by at least two oppositely rotating paint jets.

Fig. 6 veranschaulicht in einer ausschnittsweisen Teildarstellung die Anordnung der zum Verschieben und Führen der Hohlkörper 1 dienenden Mittel. Aus Gründen der Übersichtlichkeit wird hier wiederum nur ein Hohlkörper 1 dargestellt. Er wird von einer Transportschnecke 22 in Richtung des Pfeiles K mit der Öffnung 3 nach unten auf den Gitterstäben 4 verschoben, wobei er auf der der Transportschnecke 22 abgewandten Seite von einer Führungsleiste 23 geführt ist. Oberhalb des Hohlkörpers 1 ist eine Niederhalteleiste 24 angeordnet, die dafür sorgt, daß er von den aufsteigenden Lackstrahlen nicht von den Gitterstäben 4 abgehoben wird.
Während des Durchlaufens des Hohlkörpers über die Gitterstäbe 4 wird auch seine Außenoberfläche von dem aus den Düsenröhren 8 austretenden Lack überflutet und beschichtet.6 illustrates in a partial representation the arrangement of the means used to move and guide the hollow body 1. For reasons of clarity, only a hollow body 1 is shown here again. It is driven by a screw conveyor 22 in the direction of arrow K with the Opening 3 shifted downward on the bars 4, being guided by a guide bar 23 on the side facing away from the screw conveyor 22. A hold-down bar 24 is arranged above the hollow body 1, which ensures that it is not lifted off the bars 4 by the rising paint jets.
During the passage of the hollow body over the bars 4, its outer surface is also flooded and coated by the paint emerging from the nozzle tubes 8.

Wie bereits schon erwähnt, stellen die Fig. 1, 2 und 6 nur einen Ausschnitt aus einer Gesamtanlage dar, über deren Gitter 4 eine große Zahl hintereinander und nebeneinander mit der Öffnung nach unten stehend angeordneter Hohlkörper in Richtung des Pfeiles K verschoben werden. Die Gesamtanlage ist in bekannter Weise aufgebaut und umfaßt eine Förderanlage mittels derer die zu beschichtenden Hohlkörper durch eine Vorbehandlungsanlage zum Reinigen, Entfetten und Erzeugen von Konversionsschichten, ferner durch eine Spülzone, einen Trockner und schließlich nach dem Beschichten erneut durch eine Spülzone und einen Trockner sowie einen Lackeinbrennofen transportiert werden.As already mentioned, FIGS. 1, 2 and 6 represent only a section of an overall system, the grids 4 of which are used to move a large number of hollow bodies arranged one behind the other and side by side with the opening facing downward in the direction of arrow K. The overall system is constructed in a known manner and comprises a conveyor system by means of which the hollow bodies to be coated are pretreated by a pretreatment system for cleaning, degreasing and generating conversion layers, furthermore by a rinsing zone, a dryer and finally after coating again by a rinsing zone and a dryer and one Paint baking oven can be transported.

Claims (17)

1. Verfahren zum anodischen oder kathodischen Elektrolackieren von Hohlkörpern, insbesondere von Dosen, wie Getränkedosen o. dgl., mittels eines wasserlöslichen Lacks als Elektrolytflüssigkeit, die mit der Kathode oder Anode kontaktiert und in mindestens einem ununterbrochenen, eine leitende Verbindung herstellenden Strahl auf die die Anode oder Kathode bildenden Oberflächen der Hohlkörper geleitet wird,
dadurch gekennzeichnet,
daß die Hohlkörper mit der Öffnung nach unten über ein elektrisch leitendes Gitter oder Rost geschoben werden, wobei der Lack durch die freien Zwischenräume zwischen den Gitter- bzw. Roststäben in von unten aufsteigenden Strahlen in bzw. über die Hohlkörper gespült wird und dabei deren gesamte Innen- und Außenoberfläche mit einer ununterbrochenen Schicht bedeckt wird.1. A method for the anodic or cathodic electro-coating of hollow bodies, in particular cans, such as beverage cans or the like, by means of a water-soluble lacquer as an electrolytic liquid which contacts the cathode or anode and in at least one uninterrupted, conductive connection to the beam Anode or cathode-forming surfaces of the hollow body is passed
characterized,
that the hollow body is pushed with the opening down over an electrically conductive grid or grate, the paint being rinsed through the free spaces between the grid or grate bars in rays rising from below into or over the hollow body and thereby their entire interior - and the outer surface is covered with an uninterrupted layer. 2. Verfahren nach Anspruch 1,
dadurch gekennzeichnet,
daß die Hohlkörper auf dem Gitter oder Rost taktweise oder stetig verschoben werden.2. The method according to claim 1,
characterized,
that the hollow bodies on the grid or grate are shifted cyclically or continuously. 3. Verfahren nach einem der vorstehenden Ansprüche,
dadurch gekennzeichnet,
daß sich die aufsteigenden Lackstrahlen um ihre eigene Achse drehen.3. The method according to any one of the preceding claims,
characterized,
that the rising paint jets rotate on their own axis. 4. Verfahren nach Anspruch 3,
dadurch gekennzeichnet,
daß jeweils benachbarte Lackstrahlen sich gegenläufig drehen.4. The method according to claim 3,
characterized,
that neighboring paint jets rotate in opposite directions. 5. Verfahren nach Anspruch 1, 3 oder 4,
dadurch gekennzeichnet,
daß die Lackstrahlen einen Austrittsdruck von weniger als 1 bar (= 0,1 MPa) haben.5. The method according to claim 1, 3 or 4,
characterized,
that the paint jets have an outlet pressure of less than 1 bar (= 0.1 MPa). 6. Verfahren nach einem der vorstehenden Ansprüche,
dadurch gekennzeichnet,
daß der Innenraum der Hohlkörper von den aufsteigenden Lackstrahlen kurzzeitig völlig befüllt wird.6. The method according to any one of the preceding claims,
characterized,
that the interior of the hollow body is temporarily completely filled by the rising paint jets. 7. Verfahren nach Anspruch 6,
dadurg gekennzeichnet,
daß die Füllzeit ca. 15-20 ms (Millisekunden) beträgt.7. The method according to claim 6,
marked dadurg,
that the filling time is approx. 15-20 ms (milliseconds). 8. Vorrichtung zur Durchführung des Verfahrens zum anodischen Elektrolackieren nach den Ansprüchen 1 bis 7, gekennzeichnet durch folgende Merkmale: a) ein die zu lackierenden Hohlkörper (1) tragendes Gitter (4), das mit den Hohlkörpern die Anode bildet, b) ein die Kathode bildendes, unterhalb des Gitters (4) befindliches Gehäuse (9) mit darauf angeordneten Düsenröhren (8), die im Zwischenraum und im Bereich der Oberkante (5) der Gitterstäbe (4) münden, c) eine Auffangwanne (10), über der sich das Gehäuse (9) und das Gitter (4) befinden und die Bestandteil eines über das Gehäuse (9) und die Düsenröhren (8) geführten Lack-Kreislaufes ist, der in bekannter Weise eine Umwälzpumpe, einen Filter, gegebenenfalls einen Kühler und einen Vorratsbehälter aufweist. 8. Device for carrying out the method for anodic electro-painting according to claims 1 to 7, characterized by the following features: a) a grid (4) supporting the hollow body to be painted (1), which forms the anode with the hollow body, b) a housing (9) forming the cathode, located below the grid (4), with nozzle tubes (8) arranged thereon, which open into the intermediate space and in the region of the upper edge (5) of the grid bars (4), c) a drip pan (10), above which the housing (9) and the grille (4) are located and which is part of a paint circuit guided via the housing (9) and the nozzle tubes (8), which in a known manner is a Circulation pump, a filter, optionally a cooler and a storage container. 9. Vorrichtung nach Anspruch 8,
dadurch gekennzeichnet,
daß das Gehäuse (9) und die Düsenröhren (8) aus Isoliermaterial bestehen und die Kathode von einer im Gehäuse (9) angeordneten großflächigen Elektrode gebildet ist.9. The device according to claim 8,
characterized,
that the housing (9) and the nozzle tubes (8) consist of insulating material and the cathode is formed by a large-area electrode arranged in the housing (9). 10. Vorrichtung zur Durchführung des Verfahrens zum kathodischen Elektrolackieren nach den Ansprüchen 1 bis 7,
gekennzeichnet durch folgende Merkmale: a) ein die zu lackierenden Hohlkörper (1) tragendes Gitter (4), das mit den Hohlkörpern die Kathode bildet, b) ein die Anode enthaltendes, unterhalb des Gitters (4) befindliches, aus Isoliermaterial bestehendes Gehäuse (9) mit darauf angeordneten Düsenröhren (8), die im Zwischenraum und im Bereich der Oberkante (5) der Gitterstäbe (4) münden, c) eine Auffangwanne (10), über der sich das Gehäuse (9) und das Gitter (4) befinden und die Bestandteil eines über das Gehäuse (9) und die Düsenröhren (8) geführten Lack-Kreislaufes ist, der in bekannter Weise eine Umwälzpumpe, einen Filter, gegebenenfalls einen Kühler und einen Vorratsbehälter aufweist, und d) einen durch das Gehäuse (9) geführten Dialysekreislauf. 10. Device for carrying out the method for cathodic electro-painting according to claims 1 to 7,
characterized by the following features: a) a grid (4) carrying the hollow body to be painted (1), which forms the cathode with the hollow body, b) a housing (9) which contains the anode and is located below the grid (4) and is made of insulating material and has nozzle tubes (8) arranged thereon, which open into the intermediate space and in the region of the upper edge (5) of the grid bars (4), c) a drip pan (10), above which the housing (9) and the grille (4) are located and which is part of a paint circuit guided via the housing (9) and the nozzle tubes (8), which in a known manner is a Circulating pump, a filter, optionally a cooler and a reservoir, and d) a dialysis circuit guided through the housing (9). 11. Vorrichtung nach Anspruch 10,
dadurch gekennzeichnet,
daß das Gehäuse (9) mittels einer Membran (12) in einen oberen Innenraum (10) und einen unteren Innenraum (11) unterteilt ist, wobei der obere Innenraum (10) mit den Düsenröhren (8) und mit mindestens einer Lackzuleitung (16) in Verbindung steht und der untere Innenraum (11) eine die Anode bildende großflächige Elektrode (19) enthält und über eine Anolytzuleitung (17) und eine Anolytableitung (18) mit dem Dialysekreislauf verbunden ist.11. The device according to claim 10,
characterized,
that the housing (9) is divided by means of a membrane (12) into an upper interior (10) and a lower interior (11), the upper interior (10) with the nozzle tubes (8) and with at least one paint feed line (16) is connected and the lower interior (11) contains a large-area electrode (19) forming the anode and is connected to the dialysis circuit via an anolyte feed line (17) and an anolyte drain line (18). 12. Vorrichtung nach einem der Ansprüche 8 bis 11,
dadurch gekennzeichnet,
daß der Abstand der Gitterstäbe (4) voneinander so gewählt ist, daß die darüber geschobenen Hohlkörper (1) auf mindestens drei Stäben aufstehen, d.h. der Hohlkörperinnenraum von mindestens zwei sich gegenläufig drehenden Lackstrahlen beaufschlagt wird.12. The device according to one of claims 8 to 11,
characterized,
that the spacing of the lattice bars (4) from one another is selected such that the hollow bodies (1) pushed over them stand on at least three bars, ie the hollow body interior is acted upon by at least two lacquer jets rotating in opposite directions. 13. Vorrichtung nach einem der Ansprüche 8 bis 12,
dadurch gekennzeichnet,
daß in die Düsenröhren (8) je eine zylindrische Schraubenfeder (21) bzw. (21a) eingesetzt ist, wobei benachbarte Düsenröhren (8) abwechselnd mit einer rechtsdrehenden und einer linksdrehenden Feder versehen sind.13. The device according to one of claims 8 to 12,
characterized,
that a cylindrical helical spring (21) or (21a) is inserted in each of the nozzle tubes (8), adjacent nozzle tubes (8) being alternately provided with a clockwise and a counterclockwise spring. 14. Vorrichtung nach einem der Ansprüche 8 bis 13,
dadurch gekennzeichnet,
daß die Oberseite (5) der Gitterstäbe (4) schneidenartig ausgebildet ist.14. The device according to one of claims 8 to 13,
characterized,
that the top (5) of the bars (4) is designed like a knife. 15. Vorrichtung nach einem der Ansprüche 8 bis 14,
dadurch gekennzeichnet,
daß zum Verschieben der Hohlkörper (1) mindestens eine Transportschnecke (22) vorgesehen ist.15. The device according to one of claims 8 to 14,
characterized,
that at least one screw conveyor (22) is provided for moving the hollow body (1). 16. Vorrichtung nach Anspruch 15,
dadurch gekennzeichnet,
daß die Hohlkörper (1) auf der der Transportschnecke (22) abgewandten Seite von einer Führungsleiste (23) geführt sind.16. The apparatus of claim 15,
characterized,
that the hollow body (1) on the side facing away from the screw conveyor (22) are guided by a guide bar (23). 17. Vorrichtung nach einem der Ansprüche 8 bis 16,
dadurch gekennzeichnet,
daß oberhalb der über das Gitter (4) geführten Hohlkörper (1) mindestens eine Niederhalteleiste (24) angeordnet ist.17. The device according to one of claims 8 to 16,
characterized,
that at least one hold-down bar (24) is arranged above the hollow body (1) guided over the grid (4).
EP90250283A 1989-11-16 1990-11-15 Process and apparatus for anodic or cathodic painting of hollow bodies, particularly cans, by electrophoresis Expired - Lifetime EP0431711B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90250283T ATE96476T1 (en) 1989-11-16 1990-11-15 PROCESSES AND DEVICES FOR ANODIC OR CATHODIC ELECTRIC COATING OF HOLLOW BODIES, ESPECIALLY CANS.

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
DE19893938363 DE3938363A1 (en) 1989-11-16 1989-11-16 Lacquer coating of cans - for drinks by spraying-electrodeposition technique with endless conveyor
DE3938363 1989-11-16
DE19904005619 DE4005619A1 (en) 1990-02-22 1990-02-22 Lacquer coating appts. for can bodies
DE4005619 1990-02-22
DE4005622 1990-02-22
DE19904005622 DE4005622A1 (en) 1990-02-22 1990-02-22 Lacquer coating appts. for can bodies
DE4005620 1990-02-22
DE19904005620 DE4005620A1 (en) 1990-02-22 1990-02-22 Lacquer coating appts. for can bodies

Publications (2)

Publication Number Publication Date
EP0431711A1 true EP0431711A1 (en) 1991-06-12
EP0431711B1 EP0431711B1 (en) 1993-10-27

Family

ID=27434791

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90250283A Expired - Lifetime EP0431711B1 (en) 1989-11-16 1990-11-15 Process and apparatus for anodic or cathodic painting of hollow bodies, particularly cans, by electrophoresis

Country Status (8)

Country Link
US (1) US5164056A (en)
EP (1) EP0431711B1 (en)
JP (1) JPH03207896A (en)
AT (1) ATE96476T1 (en)
CA (1) CA2030033C (en)
DE (1) DE59003239D1 (en)
DK (1) DK0431711T3 (en)
ES (1) ES2045779T3 (en)

Cited By (4)

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Publication number Priority date Publication date Assignee Title
EP0529409A2 (en) * 1991-08-22 1993-03-03 Klaus Jörgens Method and device for testing the porosity of coated objects
DE4325631A1 (en) * 1993-07-30 1995-02-02 Joergens Klaus Device for the electrophoretic coating of the inner surface of hollow bodies
US5474610A (en) * 1992-05-21 1995-12-12 Joergens; Klaus Process and device for coating hollow objects
US5720647A (en) * 1995-02-18 1998-02-24 Wernicke & Co. Gmbh Device for mounting a retaining part on an optical surface of an ophthalmic blank

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DE4205672C2 (en) * 1992-02-25 1995-04-20 Doerken Ewald Ag Device for the electrolytic coating of small parts
US5409585A (en) * 1993-04-05 1995-04-25 Ppg Industries, Inc. Nozzle arrangement for electrocoating container interiors
US6358566B1 (en) 1998-10-22 2002-03-19 Alcan International Limited Process for producing decorative beverage can bodies
US7947160B2 (en) * 2004-08-13 2011-05-24 Ppg Industries Ohio, Inc. System for coating objects
US7943028B2 (en) * 2004-08-13 2011-05-17 Ppg Industries Ohio, Inc. Method for coating objects
US7767070B2 (en) * 2004-08-13 2010-08-03 Ppg Industries Ohio, Inc. Processes for coating of objects
US20060032730A1 (en) * 2004-08-13 2006-02-16 Kaufman Paul J Belt conveyor apparatus
US8524065B2 (en) * 2008-09-19 2013-09-03 Metokote Corporation Systems and methods for electrocoating a part
ES2381348B1 (en) * 2010-10-27 2013-05-06 Industrias Peñalver, S.L. REBARNIZED HEAD FOR CIRCULAR GEOMETRY COVERS.
ES2396845B1 (en) * 2010-12-17 2014-01-16 Industrias Peñalver, S.L. REBARNIZED HEAD FOR COVERS.
DE102012207699A1 (en) 2012-01-05 2013-07-11 Keiper Gmbh & Co. Kg Hollow semifinished product, process for its preparation and method for producing a hollow body
CA2902066C (en) * 2013-03-06 2018-01-02 Quaker Chemical Corporation High temperature conversion coating on steel and iron substrates
CN115537897B (en) * 2022-11-28 2023-04-18 成都图南电子有限公司 Magnet surface treatment device

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Cited By (6)

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Publication number Priority date Publication date Assignee Title
EP0529409A2 (en) * 1991-08-22 1993-03-03 Klaus Jörgens Method and device for testing the porosity of coated objects
DE4127740A1 (en) * 1991-08-22 1993-03-04 Klaus Joergens METHOD AND DEVICE FOR CHECKING THE POROSITY OF COATED ITEMS
EP0529409A3 (en) * 1991-08-22 1994-09-28 Klaus Joergens Method and device for testing the porosity of coated objects
US5474610A (en) * 1992-05-21 1995-12-12 Joergens; Klaus Process and device for coating hollow objects
DE4325631A1 (en) * 1993-07-30 1995-02-02 Joergens Klaus Device for the electrophoretic coating of the inner surface of hollow bodies
US5720647A (en) * 1995-02-18 1998-02-24 Wernicke & Co. Gmbh Device for mounting a retaining part on an optical surface of an ophthalmic blank

Also Published As

Publication number Publication date
DE59003239D1 (en) 1993-12-02
ATE96476T1 (en) 1993-11-15
CA2030033C (en) 1997-06-24
EP0431711B1 (en) 1993-10-27
JPH0433874B2 (en) 1992-06-04
ES2045779T3 (en) 1994-01-16
JPH03207896A (en) 1991-09-11
DK0431711T3 (en) 1993-12-13
US5164056A (en) 1992-11-17
CA2030033A1 (en) 1991-05-17

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