EP1588780B1 - Fluidising device containing electrodes for a powder coating equipement - Google Patents

Fluidising device containing electrodes for a powder coating equipement Download PDF

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Publication number
EP1588780B1
EP1588780B1 EP05003917A EP05003917A EP1588780B1 EP 1588780 B1 EP1588780 B1 EP 1588780B1 EP 05003917 A EP05003917 A EP 05003917A EP 05003917 A EP05003917 A EP 05003917A EP 1588780 B1 EP1588780 B1 EP 1588780B1
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EP
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Prior art keywords
fluidizing
powder
electrode arrangement
electrode
coating powder
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EP05003917A
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German (de)
French (fr)
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EP1588780A1 (en
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Markus Treppschuh
Hans-Georg Fritz
Thomas Dürr
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Duerr Systems AG
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Duerr Systems AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/14—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas designed for spraying particulate materials
    • B05B7/1404—Arrangements for supplying particulate material

Definitions

  • the invention relates to a fluidizing device for fluidizing a coating powder according to the preamble of claim 1.
  • the coating powder In powder coating systems, the coating powder is usually transported in a fluidized state as a powder-air mixture, wherein the powder-air mixture behaves similar to a liquid and therefore can be easily promoted.
  • the generation of the powder-air mixture is also referred to as fluidization and is usually carried out in a powder chamber, as for example from the two generic documents US 4,615,649 and WO 94/22589 is known.
  • the powder chamber is in this case filled with the coating powder, wherein the bottom of the powder chamber consists of a porous material which is permeable to air, but is powder-impermeable.
  • the bottom of the powder chamber which is also referred to as the fluid bottom, compressed air is blown into the powder chamber to produce the powder-air mixture, as a result of which the coating powder is fluidized.
  • the fluid bottom is usually made of an electrically insulating material, because the electrostatically charged powder dust particles would otherwise be attracted to the fluid bottom, which could lead to contamination on the fluid bottom.
  • a disadvantage of the above-described powder chamber for fluidizing the coating powder is the fact that between the electrostatically charged coating powder and the electrically insulating fluid floor or in the reverse direction electrical discharges can occur, which can lead to an ignition of the powder-air mixture in a coating powder with a high particulate matter and a correspondingly low minimum ignition energy.
  • a fluidization device in which two electrodes are arranged in the powder chamber.
  • the one electrode is in this case arranged within the powder chamber in the upper region and is charged during operation to high voltage.
  • the other electrode is disposed within the powder chamber in the lower region above the fluid bottom and electrically grounded.
  • an electric field is formed between these two electrodes, whereby the powder particles in the powder chamber are charged electrostatically and therefore better adhere to the workpiece to be coated, which is therefore electrically grounded.
  • the grounded electrode serves only as an earth electrode for the electrical charging of the powder particles and does not prevent their electrostatic charge, which is caused by the electrically insulating fluid bottom.
  • the grounded electrode is a separate component, which increases the production cost.
  • the invention is therefore based on the object to improve the known fluid soil described above in that inflammations of the powder-air mixture are reliably prevented by electrical discharges between the coating powder and the fluid bottom or in the reverse direction, even with a high particulate matter.
  • the invention includes the general technical teaching to provide an electrode assembly, is derived via the static electricity from the coating powder before the stored amount of charge sufficient to exceed the ignition energy of the powder-air mixture in an electrical discharge.
  • the fluidization body according to the invention thus has an electrode arrangement which is integrated into the fluidization body.
  • electrode arrangements which are structurally separated from the fluidizing body and arranged spatially spaced.
  • the electrode arrangement may be formed, for example, as a grid, wherein the grid-shaped electrode arrangement is preferably embedded in the surface of the fluidization body.
  • the grid-shaped electrode arrangement is preferably arranged on the side of the powder-air mixture.
  • the grid-shaped electrode arrangement divides the surface of the fluidization body into a plurality of grid surfaces, each having a size of less than 500 cm 2 , 250 cm 2 , 100 cm 2 , 50 cm 2 , 25 cm 2 , 20 cm 2 , 16 cm 2 or 4 cm 2 have.
  • This dimensioning of the lattice-shaped electrode arrangement is advantageous, since in this way it is also possible to use coating powders whose ignition energy is less than 3 mJ.
  • the electrode arrangement for discharging static electricity has at least one pointed electrode which is guided through the porous material of the fluidization body, the free tip of the electrode preferably protruding into the powder chamber.
  • the electrode arrangement even has a multiplicity of pointed electrodes which project through the porous material of the fluidising body and are distributed over the fluidizing body, so that the pointed electrodes form quasi a needle carpet.
  • the individual pointed electrodes of this needle carpet each include free surfaces of the fluidizing body, the size of the free surfaces preferably being less than 500 cm 2 , 250 cm 2 , 100 cm 2 , 50 cm 2 , 25 cm 2 , 20 cm 2 , 16 cm 2 or 4 cm 2 .
  • This offers the advantage that it is also possible to use coating powder which has an ignition energy of less than 3 mJ.
  • the electrode arrangement has a plurality of electrode rings, which are arranged on the surface of the fluidization body and electrically connected to each other.
  • the electrode rings may be, for example, circular or elliptical, but also non-circular configurations of the electrode rings are possible.
  • the electrode rings each include an annular area of less than 500 cm 2 , 250 cm 2 , 100 cm 2 , 50 cm 2 , 25 cm 2 , 20 cm 2 , 16 cm 2 or 4 cm 2 .
  • This in turn offers the advantage that it is also possible to use a coating powder which has an ignition energy of less than 3 mJ.
  • the porous material of the fluidization body is preferably electrically insulating in order to prevent attraction between the material of the fluidization body and the electrostatically charged powder dust particles.
  • the porous material of the fluidization body according to the invention is also electrically insulating.
  • the fluidizing body may for example also be tubular, wherein the fluidizing air is blown from the interior of the tubular fluidizing body through the wall outwardly into the powder chamber.
  • the electrode arrangement for discharging the static electricity can be arranged, for example, on the jacket surface of the tubular fluidizing body, with the various variants described above being possible.
  • the coating powder used has a specific ignition energy, while between the coating powder and the fluid bottom or in the reverse direction electrical discharges can occur, which have a maximum discharge by design.
  • the construction of the fluid bottom and the other parts of the fluidizing device is in this case preferably designed so that the maximum discharge energy is less than the ignition energy of the coating powder, so that discharge-induced ignitions of the powder-air mixture are prevented. This can be achieved, for example, by virtue of the fact that the electrode arrangement for discharging static electricity has sufficiently many pointed electrodes from the coating powder.
  • the maximum discharge energy in the fluidization device according to the invention can also be reduced by reducing the free area between the individual electrodes (for example, pointed electrodes, ring electrodes) of the electrode arrangement.
  • the maximum discharge energy is below 3 mJ, so that coating powder with a high particulate matter and a correspondingly small ignition energy of less than 3 mJ can be used.
  • the electrode arrangement in the fluidizing device according to the invention is earthed or is maintained at least at a near-electrical potential.
  • the electrical voltage between the electrode assembly and ground is thus in the range between 0 V and 10 kV, with any maximum values within this interval being possible.
  • the voltage may be less than 5kV, 1kV, 500V, 250V, 100V or 20V.
  • the electrode arrangement of the fluidization body according to the invention is therefore not at high voltage potential.
  • the invention also encompasses a complete powder coating installation with such a fluidization device according to the invention and the use of a fluidization body according to the invention for fluidizing a coating powder in a coating installation.
  • FIG. 1 shows a fluidization device 1 according to the invention for fluidizing a coating powder in a powder coating plant, wherein the powder coating plant can be carried out conventionally.
  • the fluidization device 1 consists essentially of a bottom part 2, a cylindrical wall 3 placed on the bottom part 2, a lid 4 and a fluidization bottom 5 which is fixed between the wall 3 and the bottom part 2.
  • a fluid air chamber 7 in which via a fluid air line 8 compressed air is blown.
  • the Fluidleitersteil 5 consists of a porous, air-permeable, but powder-impermeable material, so that from the fluid air chamber 7 compressed air into the powder chamber 6 is blown and thereby fluidized located in the powder chamber 6 coating powder.
  • a powder extraction line 9 is arranged, via which the fluidized powder-air mixture can be sucked out of the powder chamber 6.
  • a vent is arranged in the wall 3 of the powder chamber 6, which is not shown for simplicity and allows a discharge of excess compressed air from the powder chamber 6.
  • FIG. 2 shows a perspective view of a preferred embodiment of the fluidization tray 5, the fluidization device 1 shown in Figure 1.
  • a grid-shaped electrode arrangement 10 is embedded on the upper side of the fluidization floor 5, the electrode arrangement 10 of the fluidization floor 5 being electrically grounded in order to discharge electrostatic electricity from the coating powder located in the powder chamber 6. This prevents the coating powder contained in the powder chamber 6 from charging to such an extent that discharges can occur with a discharge energy which exceeds the ignition energy of the coating powder used, which could lead to ignition of the powder-air mixture.
  • the electrode arrangement 10 is designed such that a coating powder with an ignition energy of less than 3 mJ can be used.
  • the maximum discharge energy is therefore less than 3 mJ in the fluidization device 1 and is below the powder-specific ignition energy.
  • the grid-shaped electrode assembly 10 respectively Grid surfaces having a size of less than 250 cm 2 .
  • FIG. 3 illustrated embodiment of a fluidization according to the invention is largely consistent with that described above and in FIG. 2 illustrated embodiment, so that to avoid repetition of the above description to FIG. 2 is referenced, wherein the same reference numerals are used for corresponding components.
  • a special feature of this embodiment is that the electrode assembly 10 consist of a plurality of ring electrodes, which are embedded on the surface of the Fluidmaschinesteils 5 on the powder chamber 6 side facing and electrically connected to each other, wherein the entire electrode assembly 10 is electrically grounded.
  • the individual ring electrodes each include an annular area which is smaller than 250 cm 2 , so that it is also possible to use a coating powder whose ignition energy is less than 3 mJ.
  • FIGS. 4A and 4B illustrated embodiment of a fluidization according to the invention also largely agrees with that described above and in FIG. 2 illustrated embodiment, so that to avoid repetition largely to the above description FIG. 2 is referenced, wherein the same reference numerals are used for corresponding components.
  • the electrode assembly consists of a plurality of needle-shaped electrodes 11 axially through the fluidization bottom 5, wherein the tip of the electrodes 11 protrudes on the powder chamber 6 side facing the Fluidleitersteils 5 from the Fluidmaschinesteil 5 in order to derive static electricity from the coating powder located in the powder chamber 6 can.
  • the pointed electrodes 11 each have an electrode head 12, wherein the electrode heads 12 of the individual electrodes 11 of the electrode assembly 10 are interconnected by electrical connections 13.
  • the electrode arrangement 10 thus virtually forms an electrode carpet which prevents excessive and safety-endangering charging of the powder-air mixture located in the powder chamber 6.
  • FIG. 5 shows an alternative embodiment of a tubular fluidization body 14, wherein the fluidization body 14 has a wall 15 made of a porous material which is permeable to air, but powder-impermeable.
  • the fluidization body 14 has a wall 15 made of a porous material which is permeable to air, but powder-impermeable.
  • compressed air is thus blown through the wall 15 outwardly into a powder chamber from the interior of the tubular fluidizing body 14.
  • the outer circumferential surface of the tubular fluidizing body 14 is covered in this case with a grid-shaped electrode assembly consisting of circumferentially extending electrodes 16 and axially extending electrodes 17, wherein this grid-shaped electrode assembly is electrically grounded.

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  • Electrostatic Spraying Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Battery Electrode And Active Subsutance (AREA)

Abstract

The fluidising plate (5) for fluidising a powder coating powder using a fluidising gas is made of a material permeable to the gas but not to the powder. The fluidising plate has an electrode (10) of electrically conductive material to remove static electricity from the coating material and reduce the risk of ignition of the air-powder mixture.

Description

Die Erfindung betrifft eine Fluidisierungsvorrichtung zur Fluidisierung eines Beschichtungspulvers gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a fluidizing device for fluidizing a coating powder according to the preamble of claim 1.

In Pulverbeschichtungsanlagen wird das Beschichtungspulver in der Regel im fluidisierten Zustand als Pulver-Luft-Gemisch transportiert, wobei sich das Pulver-Luft-Gemisch ähnlich wie eine Flüssigkeit verhält und deshalb leicht gefördert werden kann. Die Erzeugung des Pulvers-Luft-Gemischs wird auch als Fluidisierung bezeichnet und erfolgt üblicherweise in einer Pulverkammer, wie sie beispielsweise aus den beiden gattungsbildenden Dokumenten US 4 615 649 und WO 94/22589 bekannt ist. Die Pulverkammer ist hierbei mit dem Beschichtungspulver gefüllt, wobei der Boden der Pulverkammer aus einem porösen Material besteht, das luftdurchlässig ist, aber pulverundurchlässig ist. Durch den auch als Fluidboden bezeichneten Boden der Pulverkammer wird zur Erzeugung des Pulver-Luft-Gemischs Druckluft in die Pulverkammer eingeblasen, wodurch das Beschichtungspulver fluidisiert wird.In powder coating systems, the coating powder is usually transported in a fluidized state as a powder-air mixture, wherein the powder-air mixture behaves similar to a liquid and therefore can be easily promoted. The generation of the powder-air mixture is also referred to as fluidization and is usually carried out in a powder chamber, as for example from the two generic documents US 4,615,649 and WO 94/22589 is known. The powder chamber is in this case filled with the coating powder, wherein the bottom of the powder chamber consists of a porous material which is permeable to air, but is powder-impermeable. By the bottom of the powder chamber, which is also referred to as the fluid bottom, compressed air is blown into the powder chamber to produce the powder-air mixture, as a result of which the coating powder is fluidized.

Der Fluidboden besteht hierbei üblicherweise aus einem elektrisch isolierenden Material, weil die elektrostatisch aufgeladenen Pulverstaubteilchen ansonsten von dem Fluidboden angezogen würden, was zu Verunreinigungen an dem Fluidboden führen könnte.The fluid bottom is usually made of an electrically insulating material, because the electrostatically charged powder dust particles would otherwise be attracted to the fluid bottom, which could lead to contamination on the fluid bottom.

Nachteilig an der vorstehend beschriebenen Pulverkammer zur Fluidisierung des Beschichtungspulvers ist die Tatsache, dass zwischen dem elektrostatisch aufgeladenen Beschichtungspulver und dem elektrisch isolierenden Fluidboden oder in umgekehrter Richtung elektrische Entladungen auftreten können, die bei einem Beschichtungspulver mit einem hohen Feinstaubanteil und einer entsprechend geringen Mindestzündenergie zu einer Entzündung des Pulver-Luft-Gemischs führen können.A disadvantage of the above-described powder chamber for fluidizing the coating powder is the fact that between the electrostatically charged coating powder and the electrically insulating fluid floor or in the reverse direction electrical discharges can occur, which can lead to an ignition of the powder-air mixture in a coating powder with a high particulate matter and a correspondingly low minimum ignition energy.

Weiterhin ist aus US 5 518 546 eine Fluidisierungsvorrichtung bekannt, bei der in der Pulverkammer zwei Elektroden angeordnet sind. Die eine Elektrode ist hierbei innerhalb der Pulverkammer im oberen Bereich angeordnet und wird im Betrieb auf Hochspannung aufgeladen. Die andere Elektrode ist dagegen innerhalb der Pulverkammer im unteren Bereich oberhalb des Fluidbodens angeordnet und elektrisch geerdet. Im Betrieb bildet sich zwischen diesen beiden Elektroden ein elektrisches Feld aus, wodurch die in der Pulverkammer befindlichen Pulverteilchen elektrostatisch aufgeladen werden und deshalb besser an dem zu beschichtenden Werkstück anhaften, das deshalb elektrisch geerdet ist. Die geerdete Elektrode dient hierbei jedoch nur als Erdelektrode für die elektrische Aufladung der Pulverteilchen und verhindert nicht deren elektrostatische Aufladung, die durch den elektrisch isolierenden Fluidboden verursacht wird. Darüber hinaus ist die geerdete Elektrode hierbei ein separates Bauteil, was den Fertigungsaufwand erhöht.Furthermore, it is off US 5 518 546 a fluidization device is known in which two electrodes are arranged in the powder chamber. The one electrode is in this case arranged within the powder chamber in the upper region and is charged during operation to high voltage. The other electrode, however, is disposed within the powder chamber in the lower region above the fluid bottom and electrically grounded. In operation, an electric field is formed between these two electrodes, whereby the powder particles in the powder chamber are charged electrostatically and therefore better adhere to the workpiece to be coated, which is therefore electrically grounded. However, the grounded electrode serves only as an earth electrode for the electrical charging of the powder particles and does not prevent their electrostatic charge, which is caused by the electrically insulating fluid bottom. In addition, the grounded electrode is a separate component, which increases the production cost.

Weiterhin sind aus DE-OS 27 04 714 , US 3 660 136 , US 4 078 519 und DE 32 37 830 A1 Fluidisierungsvorrichtungen mit Hochspannungselektroden bekannt. Die Hochspannungselektroden dienen hierbei jedoch gerade nicht zur Ableitung statischer Elektrizität, sondern haben gerade umgekehrt die Aufgabe, die Pulverteilchen in der Pulverkammer elektrostatisch aufzuladen, damit die Pulverteilchen besser an dem zu beschichtenden Werkstück haften, das deshalb elektrisch geerdet ist.Furthermore are out DE-OS 27 04 714 . US Pat. No. 3,660,136 . US 4,078,519 and DE 32 37 830 A1 Fluidizing devices with high voltage electrodes known. However, the high-voltage electrodes are not used here for the discharge of static electricity, but just the other way have the task to charge the powder particles in the powder chamber electrostatically, so that the powder particles adhere better to the workpiece to be coated, which is therefore electrically grounded.

Ferner ist aus WO 03/097247 A1 eine weitere herkömmliche Fluidisierungsvorrichtung bekannt, die keine Elektrodenanordnung aufweist.Furthermore, it is off WO 03/097247 A1 Another conventional fluidization device is known which has no electrode assembly.

Schließlich sind aus DE 26 50 338 A1 und US-B1-6 506 455 Fluidisierungsvorrichtungen bekannt, bei denen das Beschichtungspulver elektrostatisch aufgeladen wird, damit es anschließend an den zu beschichtenden und elektrisch geerdeten Bauteilen besser anhaftet. Bei diesen Druckschriften wird das Beschichtungspulver also elektrostatisch aufgeladen, was die Gefahr von Entzündungen noch erhöht.Finally are off DE 26 50 338 A1 and US-B1-6 506 455 Fluidizing devices are known in which the coating powder is charged electrostatically so that it subsequently adheres better to the components to be coated and electrically grounded. In these publications, the coating powder is therefore charged electrostatically, which increases the risk of inflammation.

Der Erfindung liegt deshalb die Aufgabe zugrunde, den eingangs beschriebenen bekannten Fluidboden dahingehend zu verbessern, dass Entzündungen des Pulver-Luft-Gemischs durch elektrische Entladungen zwischen dem Beschichtungspulver und dem Fluidboden oder in umgekehrter Richtung auch bei einem hohen Feinstaubanteil sicher verhindert werden.The invention is therefore based on the object to improve the known fluid soil described above in that inflammations of the powder-air mixture are reliably prevented by electrical discharges between the coating powder and the fluid bottom or in the reverse direction, even with a high particulate matter.

Diese Aufgabe wird durch eine erfindungsgemäße Fluidisierungsvorrichtung gemäß Anspruch 1 gelöst.This object is achieved by a fluidization device according to the invention according to claim 1.

Die Erfindung umfasst die allgemeine technische Lehre, eine Elektrodenanordnung vorzusehen, über die statische Elektrizität von dem Beschichtungspulver abgeleitet wird, bevor die gespeicherte Ladungsmenge ausreicht, um bei einer elektrischen Entladung die Zündenergie des Pulver-Luft-Gemischs zu überschreiten.The invention includes the general technical teaching to provide an electrode assembly, is derived via the static electricity from the coating powder before the stored amount of charge sufficient to exceed the ignition energy of the powder-air mixture in an electrical discharge.

Der erfindungsgemäße Fluidisierungskörper weist also eine Elektrodenanordnung auf, die in den Fluidisierungskörper integriert ist. Davon zu unterscheiden sind Elektrodenanordnungen, die baulich von dem Fluidisierungskörper getrennt und räumlich beabstandet angeordnet sind.The fluidization body according to the invention thus has an electrode arrangement which is integrated into the fluidization body. A distinction must be made between electrode arrangements, which are structurally separated from the fluidizing body and arranged spatially spaced.

Die Elektrodenanordnung kann beispielsweise als Gitter ausgebildet sein, wobei die gitterförmige Elektrodenanordnung vorzugsweise in die Oberfläche des Fluidisierungskörpers eingelassen ist. Bei einem plattenförmigen Fluidisierungskörper entsprechend dem eingangs erwähnten Stand der Technik ist die gitterförmige Elektrodenanordnung vorzugsweise auf der Seite des Pulver-Luft-Gemischs angeordnet.The electrode arrangement may be formed, for example, as a grid, wherein the grid-shaped electrode arrangement is preferably embedded in the surface of the fluidization body. In a plate-shaped fluidizing body according to the above-mentioned prior art, the grid-shaped electrode arrangement is preferably arranged on the side of the powder-air mixture.

Vorzugsweise unterteilt die gitterförmige Elektrodenanordnung die Oberfläche des Fluidisierungskörpers in mehrere Gitterflächen, die jeweils eine Größe von weniger als 500 cm2, 250 cm2, 100 cm2, 50 cm2, 25 cm2, 20 cm2, 16 cm2 oder 4 cm2 aufweisen. Diese Dimensionierung der gitterförmigen Elektrodenanordnung ist vorteilhaft, da sich auf diese Weise auch Beschichtungspulver verwenden lassen, deren Zündenergie kleiner als 3 mJ ist.Preferably, the grid-shaped electrode arrangement divides the surface of the fluidization body into a plurality of grid surfaces, each having a size of less than 500 cm 2 , 250 cm 2 , 100 cm 2 , 50 cm 2 , 25 cm 2 , 20 cm 2 , 16 cm 2 or 4 cm 2 have. This dimensioning of the lattice-shaped electrode arrangement is advantageous, since in this way it is also possible to use coating powders whose ignition energy is less than 3 mJ.

In einer anderen Variante der Erfindung weist die Elektrodenanordnung zur Ableitung statischer Elektrizität dagegen mindestens eine spitze Elektrode auf, die durch das poröse Material des Fluidisierungskörpers hindurch geführt ist, wobei die freie Spitze der Elektrode vorzugsweise in die Pulverkammer hineinragt.In another variant of the invention, however, the electrode arrangement for discharging static electricity has at least one pointed electrode which is guided through the porous material of the fluidization body, the free tip of the electrode preferably protruding into the powder chamber.

In einem bevorzugten Ausführungsbeispiel der Erfindung weist die Elektrodenanordnung sogar eine Vielzahl von spitzen Elektroden auf, die durch das poröse Material des Fluidisierungskörpers hindurch ragen, und über den Fluidisierungskörper verteilt angeordnet sind, so dass die spitzen Elektroden quasi einen Nadelteppich bilden.In a preferred embodiment of the invention, the electrode arrangement even has a multiplicity of pointed electrodes which project through the porous material of the fluidising body and are distributed over the fluidizing body, so that the pointed electrodes form quasi a needle carpet.

Die einzelnen spitzen Elektroden dieses Nadelteppichs schließen jeweils freie Flächen des Fluidisierungskörpers ein, wobei die Größe der freien Flächen vorzugsweise geringer als 500 cm2, 250 cm2, 100 cm2, 50 cm2, 25 cm2, 20 cm2, 16 cm2 oder 4 cm2 ist. Dies bietet den Vorteil, dass sich auch Beschichtungspulver einsetzen lässt, das eine Zündenergie von weniger als 3 mJ aufweist.The individual pointed electrodes of this needle carpet each include free surfaces of the fluidizing body, the size of the free surfaces preferably being less than 500 cm 2 , 250 cm 2 , 100 cm 2 , 50 cm 2 , 25 cm 2 , 20 cm 2 , 16 cm 2 or 4 cm 2 . This offers the advantage that it is also possible to use coating powder which has an ignition energy of less than 3 mJ.

In einer anderen Variante der Erfindung weist die Elektrodenanordnung dagegen mehrere Elektrodenringe auf, die an der Oberfläche des Fluidisierungskörpers angeordnet und elektrisch miteinander verbunden sind. Die Elektrodenringe können beispielsweise kreisförmig oder ellipsenförmig sein, jedoch sind auch unrunde Gestaltungen der Elektrodenringe möglich.In another variant of the invention, however, the electrode arrangement has a plurality of electrode rings, which are arranged on the surface of the fluidization body and electrically connected to each other. The electrode rings may be, for example, circular or elliptical, but also non-circular configurations of the electrode rings are possible.

Vorzugweise schließen die Elektrodenringe hierbei jeweils eine Ringfläche von weniger als 500 cm2, 250 cm2, 100 cm2, 50 cm2, 25 cm2, 20 cm2, 16 cm2 oder 4 cm2 ein. Dies bietet wiederum den Vorteil, dass sich auch ein Beschichtungspulver einsetzen lässt, das eine Zündenergie von weniger als 3 mJ aufweist.Preferably, the electrode rings each include an annular area of less than 500 cm 2 , 250 cm 2 , 100 cm 2 , 50 cm 2 , 25 cm 2 , 20 cm 2 , 16 cm 2 or 4 cm 2 . This in turn offers the advantage that it is also possible to use a coating powder which has an ignition energy of less than 3 mJ.

Es wurde bereits vorstehend bei der Erörterung des Standes der Technik darauf hingewiesen, dass das poröse Material des Fluidisierungskörpers vorzugsweise elektrisch isolierend ist, um eine Anziehung zwischen dem Material des Fluidisierungskörpers und den elektrostatisch aufgeladenen Pulverstaubteilchen zu verhindern. Aus dem gleichen Grund ist das poröse Material des erfindungsgemäßen Fluidisierungskörpers ebenfalls elektrisch isolierend.It has already been pointed out above in the discussion of the prior art that the porous material of the fluidization body is preferably electrically insulating in order to prevent attraction between the material of the fluidization body and the electrostatically charged powder dust particles. For the same reason, the porous material of the fluidization body according to the invention is also electrically insulating.

Weiterhin ist zu erwähnen, dass die Erfindung nicht auf plattenförmige Fluidisierungskörper beschränkt ist, wie sie in dem eingangs zitierten Stand der Technik beschrieben werden.It should also be mentioned that the invention is not limited to plate-shaped fluidization bodies, as described in the cited prior art.

Vielmehr kann der Fluidisierungskörper beispielsweise auch schlauchförmig sein, wobei die Fluidisierungsluft aus dem Inneren des schlauchförmigen Fluidisierungskörpers durch dessen Wandung hindurch nach außen in die Pulverkammer geblasen wird.Rather, the fluidizing body may for example also be tubular, wherein the fluidizing air is blown from the interior of the tubular fluidizing body through the wall outwardly into the powder chamber.

Bei einer derartigen schlauchförmigen Gestaltung des Fluidisierungskörpers kann die Elektrodenanordnung zur Ableitung der statischen Elektrizität beispielsweise auf der Mantelfläche des schlauchförmigen Fluidisierungskörpers angeordnet sein, wobei die vorstehend beschriebenen verschiedenen Varianten möglich sind.With such a tubular design of the fluidizing body, the electrode arrangement for discharging the static electricity can be arranged, for example, on the jacket surface of the tubular fluidizing body, with the various variants described above being possible.

Hierbei weist das verwendete Beschichtungspulver eine bestimmte Zündenergie auf, während zwischen dem Beschichtungspulver und dem Fluidboden oder in umgekehrter Richtung elektrische Entladungen auftreten können, die konstruktionsbedingt eine maximale Entladeenergie aufweisen. Die Konstruktion des Fluidbodens und der sonstigen Teile der Fluidisierungsvorrichtung ist hierbei vorzugsweise so ausgelegt, dass die maximale Entladeenergie kleiner als die Zündenergie des Beschichtungspulvers ist, damit entladungsbedingte Zündungen des Pulver-Luft-Gemischs verhindert werden. Dies lässt sich beispielsweise dadurch erreichen, dass die Elektrodenanordnung zur Ableitung statischer Elektrizität von dem Beschichtungspulver hinreichend viele spitze Elektroden aufweist. Die maximale Entladeenergie lässt sich bei der erfindungsgemäßen Fluidisierungsvorrichtung auch dadurch senken, dass die freie Fläche zwischen den einzelnen Elektroden (z.B. spitze Elektroden, Ringelektroden) der Elektrodenanordnung verkleinert wird.In this case, the coating powder used has a specific ignition energy, while between the coating powder and the fluid bottom or in the reverse direction electrical discharges can occur, which have a maximum discharge by design. The construction of the fluid bottom and the other parts of the fluidizing device is in this case preferably designed so that the maximum discharge energy is less than the ignition energy of the coating powder, so that discharge-induced ignitions of the powder-air mixture are prevented. This can be achieved, for example, by virtue of the fact that the electrode arrangement for discharging static electricity has sufficiently many pointed electrodes from the coating powder. The maximum discharge energy in the fluidization device according to the invention can also be reduced by reducing the free area between the individual electrodes (for example, pointed electrodes, ring electrodes) of the electrode arrangement.

Vorzugsweise liegt die maximale Entladeenergie hierbei unterhalb von 3 mJ, so dass sich auch Beschichtungspulver mit einem hohen Feinstaubanteil und einer entsprechend kleinen Zündenergie von weniger als 3 mJ einsetzen lässt.Preferably, the maximum discharge energy is below 3 mJ, so that coating powder with a high particulate matter and a correspondingly small ignition energy of less than 3 mJ can be used.

Zur Ableitung der statischen Elektrizität von dem Beschichtungspulver ist die Elektrodenanordnung bei der erfindungsgemäßen Fluidisierungsvorrichtung geerdet oder wird zumindest auf einem erdnahen elektrischen Potential gehalten. Vorzugsweise liegt die elektrische Spannung zwischen der Elektrodenanordnung und Masse also im Bereich zwischen 0 V und 10 kV, wobei beliebige Maximalwerte innerhalb dieses Intervalls möglich sind. Beispielsweise kann die Spannung kleiner als 5 kV, 1kV, 500 V, 250 V, 100 V oder 20 V sein. Im Gegensatz zu dem eingangs zitierten Stand der Technik liegt die Elektrodenanordnung des erfindungsgemäßen Fluidisierungskörpers also gerade nicht auf Hochspannungspotential.In order to dissipate the static electricity from the coating powder, the electrode arrangement in the fluidizing device according to the invention is earthed or is maintained at least at a near-electrical potential. Preferably, the electrical voltage between the electrode assembly and ground is thus in the range between 0 V and 10 kV, with any maximum values within this interval being possible. For example, the voltage may be less than 5kV, 1kV, 500V, 250V, 100V or 20V. In contrast to the cited prior art, the electrode arrangement of the fluidization body according to the invention is therefore not at high voltage potential.

Ferner umfasst die Erfindung auch eine vollständige Pulverbeschichtungsanlage mit einer derartigen erfindungsgemäßen Fluidisierungsvorrichtung sowie die Verwendung eines erfindungsgemäßen Fluidisierungskörpers zur Fluidisierung eines Beschichtungspulvers in einer Beschichtungsanlage.Furthermore, the invention also encompasses a complete powder coating installation with such a fluidization device according to the invention and the use of a fluidization body according to the invention for fluidizing a coating powder in a coating installation.

Andere vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen gekennzeichnet oder werden nachstehend zusammen mit der Beschreibung der bevorzugten Ausführungsbeispiele der Erfindung anhand der Figuren näher erläutert. Es zeigen:

Figur 1
eine vereinfachte Querschnittsansicht einer erfindungsgemäßen Fluidisierungsvorrichtung,
Figur 2
ein Ausführungsbeispiel des Fluidbodens der Fluidisierungsvorrichtung aus Figur 1 mit einer gitterförmigen Elektrodenanordnung,
Figur 3
ein anderes Ausführungsbeispiel des Fluidisierungsbodens der Fluidisierungsvorrichtung aus Figur 1 mit einer Elektrodenanordnung mit mehreren ringförmigen Elektroden,
Figur 4A und 4B
ein weiteres Ausführungsbeispiel des Fluidisierungsbodens der Fluidisierungsvorrichtung aus Figur 1 mit zahlreichen nadelförmigen Elektroden zur Ableitung statischer Elektrizität sowie
Figur 5
einen schlauchförmigen Fluidisierungskörper mit einer gitterförmigen Elektrodenanordnung zur Ableitung statischer Elektrizität.
Other advantageous developments of the invention are characterized in the subclaims or are explained in more detail below together with the description of the preferred embodiments of the invention with reference to FIGS. Show it:
FIG. 1
a simplified cross-sectional view of a fluidization device according to the invention,
FIG. 2
an embodiment of the fluid bottom of the fluidizing device FIG. 1 with a grid-shaped electrode arrangement,
FIG. 3
another embodiment of the fluidization bottom of the fluidization device out FIG. 1 with an electrode arrangement with a plurality of annular electrodes,
FIGS. 4A and 4B
a further embodiment of the fluidization bottom of the fluidization device FIG. 1 with numerous needle-shaped electrodes for dissipation of static electricity as well
FIG. 5
a tubular fluidizing body with a grid-shaped electrode arrangement for discharging static electricity.

Die Querschnittsansicht in Figur 1 zeigt eine erfindungsgemäße Fluidisierungsvorrichtung 1 zur Fluidisierung eines Beschichtungspulvers in einer Pulverbeschichtungsanlage, wobei die Pulverbeschichtungsanlage herkömmlich ausgeführt sein kann.The cross-sectional view in FIG. 1 shows a fluidization device 1 according to the invention for fluidizing a coating powder in a powder coating plant, wherein the powder coating plant can be carried out conventionally.

Die Fluidisierungsvorrichtung 1 besteht im Wesentlichen aus einem Bodenteil 2, einer auf das Bodenteil 2 aufgesetzten zylindrischen Wandung 3, einem Deckel 4 sowie einem Fluidisierungsboden 5, der zwischen der Wandung 3 und dem Bodenteil 2 fixiert ist.The fluidization device 1 consists essentially of a bottom part 2, a cylindrical wall 3 placed on the bottom part 2, a lid 4 and a fluidization bottom 5 which is fixed between the wall 3 and the bottom part 2.

Der Deckel 4, die Wandung 3 und der Fluidisierungsboden 5 begrenzen hierbei eine Pulverkammer 6, in der sich im Betrieb ein fluidisiertes Pulver-Luft-Gemisch befindet.The cover 4, the wall 3 and the Fluidisierungsboden 5 in this case limit a powder chamber 6, in which there is a fluidized powder-air mixture in operation.

Unterhalb des Fluidisierungsbodens 5 befindet sich in dem Bodenteil 2 eine Fluidluftkammer 7, in die über eine Fluidluftleitung 8 Druckluft eingeblasen wird.Below the Fluidisierungsbodens 5 is located in the bottom part 2, a fluid air chamber 7, in which via a fluid air line 8 compressed air is blown.

Der Fluidisierungsboden 5 besteht hierbei aus einem porösen, luftdurchlässigen, aber pulverundurchlässigen Material, so dass aus der Fluidluftkammer 7 Druckluft in die Pulverkammer 6 eingeblasen wird und dadurch das in der Pulverkammer 6 befindliche Beschichtungspulver fluidisiert.The Fluidisierungsboden 5 consists of a porous, air-permeable, but powder-impermeable material, so that from the fluid air chamber 7 compressed air into the powder chamber 6 is blown and thereby fluidized located in the powder chamber 6 coating powder.

In der Wandung 3 der Pulverkammer 6 ist eine Pulverentnahmeleitung 9 angeordnet, über die das fluidisierte Pulver-Luft-Gemisch aus der Pulverkammer 6 abgesaugt werden kann.In the wall 3 of the powder chamber 6, a powder extraction line 9 is arranged, via which the fluidized powder-air mixture can be sucked out of the powder chamber 6.

Darüber hinaus ist in der Wandung 3 der Pulverkammer 6 eine Entlüftung angeordnet, die zur Vereinfachung nicht dargestellt ist und eine Ableitung überschüssiger Druckluft aus der Pulverkammer 6 ermöglicht.In addition, a vent is arranged in the wall 3 of the powder chamber 6, which is not shown for simplicity and allows a discharge of excess compressed air from the powder chamber 6.

Figur 2 zeigt eine perspektivische Ansicht eines bevorzugten Ausführungsbeispiels des Fluidisierungsbodens 5, der in Figur 1 gezeigten Fluidisierungsvorrichtung 1. FIG. 2 shows a perspective view of a preferred embodiment of the fluidization tray 5, the fluidization device 1 shown in Figure 1.

Aus dieser Darstellung ist ersichtlich, dass an der Oberseite des Fluidisierungsbodens 5 eine gitterförmige Elektrodenanordnung 10 eingelassen ist, wobei die Elektrodenanordnung 10 des Fluidisierungsbodens 5 elektrisch geerdet ist, um elektrostatische Elektrizität von dem in der Pulverkammer 6 befindlichen Beschichtungspulver abzuleiten. Dies verhindert, dass das in der Pulverkammer 6 befindliche Beschichtungspulver soweit aufgeladen werden kann, dass Entladungen mit einer Entladeenergie auftreten können, welche die Zündenergie des verwendeten Beschichtungspulvers übersteigt, was zu einer Entzündung des Pulver-Luft-Gemischs führen könnte.It can be seen from this illustration that a grid-shaped electrode arrangement 10 is embedded on the upper side of the fluidization floor 5, the electrode arrangement 10 of the fluidization floor 5 being electrically grounded in order to discharge electrostatic electricity from the coating powder located in the powder chamber 6. This prevents the coating powder contained in the powder chamber 6 from charging to such an extent that discharges can occur with a discharge energy which exceeds the ignition energy of the coating powder used, which could lead to ignition of the powder-air mixture.

Die Elektrodenanordnung 10 ist hierbei so ausgelegt, dass sich ein Beschichtungspulver mit einer Zündenergie von weniger als 3 mJ einsetzen lässt. Die maximale Entladeenergie ist also bei der Fluidisierungsvorrichtung 1 kleiner als 3 mJ und liegt unterhalb der pulverspezifischen Zündenergie. Hierzu schließt die gitterförmige Elektrodenanordnung 10 jeweils Gitterflächen ein, die eine Größe von weniger als 250 cm2 aufweisen.In this case, the electrode arrangement 10 is designed such that a coating powder with an ignition energy of less than 3 mJ can be used. The maximum discharge energy is therefore less than 3 mJ in the fluidization device 1 and is below the powder-specific ignition energy. For this purpose, the grid-shaped electrode assembly 10 respectively Grid surfaces having a size of less than 250 cm 2 .

Das in Figur 3 dargestellte Ausführungsbeispiel eines erfindungsgemäßen Fluidisierungsbodens stimmt weitgehend mit dem vorstehend beschriebenen und in Figur 2 dargestellten Ausführungsbeispiel überein, so dass zur Vermeidung von Wiederholungen auf die vorstehende Beschreibung zu Figur 2 verwiesen wird, wobei für entsprechende Bauteile dieselben Bezugszeichen verwendet werden.This in FIG. 3 illustrated embodiment of a fluidization according to the invention is largely consistent with that described above and in FIG. 2 illustrated embodiment, so that to avoid repetition of the above description to FIG. 2 is referenced, wherein the same reference numerals are used for corresponding components.

Eine Besonderheit dieses Ausführungsbeispiels besteht darin, dass die Elektrodenanordnung 10 aus einer Vielzahl von Ringelektroden bestehen, die an der Oberfläche des Fluidisierungsbodens 5 auf der der Pulverkammer 6 zugewandten Seite eingelassen und elektrisch miteinander verbunden sind, wobei die gesamte Elektrodenanordnung 10 elektrisch geerdet ist.A special feature of this embodiment is that the electrode assembly 10 consist of a plurality of ring electrodes, which are embedded on the surface of the Fluidisierungsbodens 5 on the powder chamber 6 side facing and electrically connected to each other, wherein the entire electrode assembly 10 is electrically grounded.

Die einzelnen Ringelektroden schließen hierbei jeweils eine Ringfläche ein, die kleiner als 250 cm2 ist, so dass sich auch ein Beschichtungspulver einsetzen lässt, dessen Zündenergie kleiner als 3 mJ ist.The individual ring electrodes each include an annular area which is smaller than 250 cm 2 , so that it is also possible to use a coating powder whose ignition energy is less than 3 mJ.

Das in den Figuren 4A und 4B dargestellte Ausführungsbeispiel eines erfindungsgemäßen Fluidisierungsbodens stimmt ebenfalls weitgehend mit dem vorstehend beschriebenen und in Figur 2 dargestellten Ausführungsbeispiel überein, so dass zur Vermeidung von Wiederholungen weitgehend auf die vorstehende Beschreibung zu Figur 2 verwiesen wird, wobei für entsprechende Bauteile dieselben Bezugszeichen verwendet werden.That in the FIGS. 4A and 4B illustrated embodiment of a fluidization according to the invention also largely agrees with that described above and in FIG. 2 illustrated embodiment, so that to avoid repetition largely to the above description FIG. 2 is referenced, wherein the same reference numerals are used for corresponding components.

Eine Besonderheit dieses Ausführungsbeispiels besteht darin, dass die Elektrodenanordnung aus einer Vielzahl von nadelförmigen Elektroden 11 besteht, die axial durch den Fluidisierungsboden 5 hindurch geführt sind, wobei die Spitze der Elektroden 11 auf der der Pulverkammer 6 zugewandten Seite des Fluidisierungsbodens 5 aus dem Fluidisierungsboden 5 herausragt, um statische Elektrizität von dem in der Pulverkammer 6 befindlichen Beschichtungspulver ableiten zu können.A peculiarity of this embodiment is that the electrode assembly consists of a plurality of needle-shaped electrodes 11 axially through the fluidization bottom 5, wherein the tip of the electrodes 11 protrudes on the powder chamber 6 side facing the Fluidisierungsbodens 5 from the Fluidisierungsboden 5 in order to derive static electricity from the coating powder located in the powder chamber 6 can.

Auf der gegenüberliegenden Seite weisen die spitzen Elektroden 11 jeweils einen Elektrodenkopf 12 auf, wobei die Elektrodenköpfe 12 der einzelnen Elektroden 11 der Elektrodenanordnung 10 untereinander durch elektrische Verbindungen 13 miteinander verbunden sind.On the opposite side, the pointed electrodes 11 each have an electrode head 12, wherein the electrode heads 12 of the individual electrodes 11 of the electrode assembly 10 are interconnected by electrical connections 13.

Die Elektrodenanordnung 10 bildet hierbei also quasi einen Elektrodenteppich, der eine übermäßige und sicherheitsgefährdende Aufladung des in der Pulverkammer 6 befindlichen Pulver-Luft-Gemischs verhindert.In this case, the electrode arrangement 10 thus virtually forms an electrode carpet which prevents excessive and safety-endangering charging of the powder-air mixture located in the powder chamber 6.

Figur 5 zeigt ein alternatives Ausführungsbeispiel eines schlauchförmigen Fluidisierungskörpers 14, wobei der Fluidisierungskörper 14 eine Wandung 15 aus einem porösen Material aufweist, das luftdurchlässig, aber pulverundurchlässig ist. Zur Fluidisierung von Beschichtungspulver wird hierbei also aus dem Inneren des schlauchförmigen Fluidisierungskörpers 14 Druckluft durch die Wandung 15 hindurch nach außen in eine Pulverkammer geblasen. FIG. 5 shows an alternative embodiment of a tubular fluidization body 14, wherein the fluidization body 14 has a wall 15 made of a porous material which is permeable to air, but powder-impermeable. For the fluidization of coating powder, in this case, compressed air is thus blown through the wall 15 outwardly into a powder chamber from the interior of the tubular fluidizing body 14.

Die äußere Mantelfläche des schlauchförmigen Fluidisierungskörpers 14 ist hierbei mit einer gitterförmigen Elektrodenanordnung bedeckt, die aus in Umfangsrichtung umlaufenden Elektroden 16 und axial verlaufenden Elektroden 17 besteht, wobei diese gitterförmige Elektrodenanordnung elektrisch geerdet ist.The outer circumferential surface of the tubular fluidizing body 14 is covered in this case with a grid-shaped electrode assembly consisting of circumferentially extending electrodes 16 and axially extending electrodes 17, wherein this grid-shaped electrode assembly is electrically grounded.

Claims (15)

  1. Fluidizing apparatus (1) comprising
    a) a fluidizing body (5, 14) for fluidizing a coating powder with a fluidizing gas,
    b) wherein the fluidizing body (5, 14) at least partially consists of a material which is permeable for the fluidizing gas and impermeable for the coating powder,
    c) wherein the fluidizing body consists of an electrically insulating porous material,
    characterized in
    d) that an electrode arrangement (10) is provided, which is made from an electrically insulating material,
    e) that the electrode arrangement (10) is electrically grounded or is on an near-ground electrical potential,
    f) that the electrode arrangement (10) is integrated in the fluidizing body (5, 14) and
    g) that the electrode arrangement (10) serves for discharging static electricity from the coating powder.
  2. Fluidizing apparatus (1) according to claim 1, characterized in that the electrode arrangement (10) comprises a lattice.
  3. Fluidizing apparatus (1) according to claim 2, characterized in that the lattice is embedded in the surface of the fluidizing body (5, 14).
  4. Fluidizing apparatus (1) according to claim 3, characterized in that the lattice divides the surface of the fluidizing body (5, 14) into lattice areas each having a size of less than 500 cm2, 250 cm2, 100 cm2, 50 cm2, 25 cm2, 20 cm2, 16 cm2 or 4 cm2.
  5. Fluidizing apparatus (1) according to claim 1, characterized in that the electrode arrangement comprises at least one sharp electrode (11) which is fed through the porous material.
  6. Fluidizing apparatus (1) according to claim 5, characterized in that the electrode arrangement (10) comprises a plurality of sharp electrodes (11) which are fed through the porous material and which are arranged in a distributed manner over the fluidized body (5).
  7. Fluidizing apparatus (1) according to claim 6, characterized in that there is a free surface of the fluidizing body (5) between the sharp electrodes (11) having a size of less than 500 cm2, 250 cm2, 100 cm2, 50 cm2, 25 cm2, 20 cm2, 16 cm2 or 4 cm2.
  8. Fluidizing apparatus (1) according to claim 1, characterized in that the electrode arrangement (10) comprises several electrode rings which are arranged on the surface of the fluidizing body (5) and which are electrically connected with each other.
  9. Fluidizing apparatus (1) according to claim 8, characterized in that the electrode rings each enclose a ring area of less than 500 cm2, 250 cm2, 100 cm2, 50 cm2, 25 cm2, 20 cm2, 16 cm2 or 4 cm2.
  10. Fluidizing apparatus (1) according to one of the preceding claims, characterized in that the fluidizing body (5, 14) is plate-shaped or tube-shaped.
  11. Fluidizing apparatus (1) according to claim 10, characterized in that the electrode arrangement (16, 17) is arranged on the circumferential surface of the tube-shaped fluidizing body (14).
  12. Fluidizing apparatus (1) according to one of the preceding claims, characterized in that the coating powder comprises a specific ignition energy, wherein electrical discharges between the coating powder and the electrode arrangement (10) comprise a maximum discharge energy, wherein the maximum discharge energy is smaller than the ignition energy.
  13. Fluidizing apparatus (1) according to claim 12, characterized in that the ignition energy of the coating powder is smaller than 3mJ and/or that the maximum discharge energy is smaller than 3mJ.
  14. Powder coating installation comprising a fluidizing apparatus (1) according to one of the preceding claims.
  15. Use of a fluidizing apparatus (1) according to one of the preceding claims for fluidizing a coating powder in a coating installation.
EP05003917A 2004-04-23 2005-02-23 Fluidising device containing electrodes for a powder coating equipement Not-in-force EP1588780B1 (en)

Applications Claiming Priority (2)

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DE102004019946 2004-04-23
DE102004019946A DE102004019946A1 (en) 2004-04-23 2004-04-23 Fluidizing body for a powder coating system

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EP1588780B1 true EP1588780B1 (en) 2010-04-21

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EP2070510A1 (en) * 2007-12-10 2009-06-17 Takasago International Corporation Personal cleansing system
CN114572693A (en) * 2022-02-16 2022-06-03 湖南远阳智能装备有限公司 Inhale airtight powder center that supplies of powder, blowback integral type

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Publication number Priority date Publication date Assignee Title
US3660136A (en) * 1970-11-23 1972-05-02 Gen Electric Method of coating slotted articles
DD123644A1 (en) 1976-01-27 1977-01-12
US4084019A (en) * 1976-02-05 1978-04-11 Armco Steel Corporation Electrostatic coating grid and method
US4078519A (en) * 1977-02-02 1978-03-14 Poly-Clad Equipment Corporation Electrostatically charged fluidized bed
CA1156452A (en) * 1981-10-19 1983-11-08 Jorg-Hein Walling Electrode for a fluidizable bed coating apparatus
JP3489035B2 (en) 1993-04-07 2004-01-19 ノードソン株式会社 Powder coating equipment
US5518546A (en) * 1994-10-05 1996-05-21 Enexus Corporation Apparatus for coating substrates with inductively charged resinous powder particles
FR2795004A1 (en) 1999-06-15 2000-12-22 Atofina METHOD FOR COVERING AN OBJECT WITH A FILM AND APPARATUS FOR CARRYING OUT SAID METHOD
WO2003097247A1 (en) * 2002-05-13 2003-11-27 Nordson Corporation Simplified powder fluidization apparatus and method

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DE102004019946A1 (en) 2005-11-17
ATE464953T1 (en) 2010-05-15
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