DE19616695A1 - Electrostatic spray coating of objects with powder - Google Patents
Electrostatic spray coating of objects with powderInfo
- Publication number
- DE19616695A1 DE19616695A1 DE1996116695 DE19616695A DE19616695A1 DE 19616695 A1 DE19616695 A1 DE 19616695A1 DE 1996116695 DE1996116695 DE 1996116695 DE 19616695 A DE19616695 A DE 19616695A DE 19616695 A1 DE19616695 A1 DE 19616695A1
- Authority
- DE
- Germany
- Prior art keywords
- honeycomb
- electrodes
- electrode
- powder layer
- fluidized powder
- 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.)
- Withdrawn
Links
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/18—Processes for applying liquids or other fluent materials performed by dipping
- B05D1/22—Processes for applying liquids or other fluent materials performed by dipping using fluidised-bed technique
- B05D1/24—Applying particulate materials
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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
- B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
- B05B5/025—Discharge apparatus, e.g. electrostatic spray guns
- B05B5/053—Arrangements for supplying power, e.g. charging power
- B05B5/0533—Electrodes specially adapted therefor; Arrangements of electrodes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
- B05B5/08—Plant for applying liquids or other fluent materials to objects
- B05B5/087—Arrangements of electrodes, e.g. of charging, shielding, collecting electrodes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C19/00—Apparatus specially adapted for applying particulate materials to surfaces
- B05C19/005—Apparatus specially designed for applying particulate materials to the inside of hollow work
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C19/00—Apparatus specially adapted for applying particulate materials to surfaces
- B05C19/02—Apparatus specially adapted for applying particulate materials to surfaces using fluidised-bed techniques
- B05C19/025—Combined with electrostatic means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
- B05B5/025—Discharge apparatus, e.g. electrostatic spray guns
- B05B5/03—Discharge apparatus, e.g. electrostatic spray guns characterised by the use of gas, e.g. electrostatically assisted pneumatic spraying
- B05B5/032—Discharge apparatus, e.g. electrostatic spray guns characterised by the use of gas, e.g. electrostatically assisted pneumatic spraying for spraying particulate materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/007—Processes for applying liquids or other fluent materials using an electrostatic field
Landscapes
- Application Of Or Painting With Fluid Materials (AREA)
- Electrostatic Spraying Apparatus (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren und eine Vorrichtung zum elektrostatischen Beschichten von Gegenständen mit Pulverteilchen in einer fluidisierten PulverschichtThe invention relates to a method and an apparatus for electrostatic coating of objects with Powder particles in a fluidized powder layer
Die Pulverteilchen werden durch Elektroden, die sich in einer fluidisierten Pulverschicht befinden, elektrostatisch aufgeladen. Die fluidisierte Pulverschicht entsteht über einen porösen Anströmboden, wenn Luft in das Pulver geblasen wird. Gegenstände, die geerdet sind, werden durch Eintauchen in die aufgeladene fluidisierte Pulverschicht beschichtet. Dabei ist der Aufbau der Elektroden mitunter sehr kompliziert. Man benötigt besondere Stromzuführungselektroden. Bei größeren und komplizierten Drahtwaren und entsprechend größeren Tauchbecken ist die Beschichtung in der Mitte zwischen den Elektroden zuweilen unzureichend und die Schichtdicke zuweilen recht unterschiedlich. Auch ist die eingesetzte Aufladespannung U = +/- 20 kV noch zu hoch. Dies fährt zu einem großen Strom bei großen flächenhaften Elektroden.The powder particles are separated by electrodes, which are in a fluidized powder layer are located electrostatically charged. The fluidized powder layer is created over a porous inflow floor when air is blown into the powder. Objects that are grounded are immersed in the charged fluidized powder layer coated. It is the structure of the electrodes can be very complicated. Man requires special power supply electrodes. For larger and complicated wire goods and correspondingly larger plunge pools is the coating in the middle between the electrodes sometimes inadequate and the layer thickness sometimes quite differently. The charging voltage used is also U = +/- 20 kV still too high. This leads to a large current large flat electrodes.
In DE 43 41 157 werden elektrische Leiter, welche von elektrisch nichtleitenden Tragelementen umgeben sind, verwendet. Zusätzlich ist noch eine Abgabevorrichtung zur Abgabe des Beschichtungsmateriales in den Raum vorhanden.In DE 43 41 157 are electrical conductors, which of electrical non-conductive support elements are used. In addition is still a dispenser for dispensing the Coating material available in the room.
In OS 32 37 830 ist anstelle des porösen Anströmbodens ein leitfähiger Boden mit einer Vielzahl leitfähiger Rohre, die an Hochspannung liegen und in die Wirbelschicht ragen, angegeben.In OS 32 37 830 there is a instead of the porous inflow floor conductive floor with a variety of conductive tubes attached to it High voltage and protrude into the fluidized bed.
Ziel der Erfindung ist es, ein Verfahren und eine Vorrichtung zum elektrostatischen Beschichten von Gegenständen mit Pulverteilchen in einer Wirbelschicht zu entwickeln, wo die beschriebenen Nachteile nahezu vermieden werden. The aim of the invention is a method and an apparatus for electrostatic coating of objects with To develop powder particles in a fluidized bed where the Disadvantages described can be almost avoided.
Es ist Aufgabe der Erfindung, ein Verfahren und eine Vorrichtung zum elektrostatischen Beschichten von Gegenständen mit Pulverteilchen in einer Wirbelschicht zu entwickeln, wo im Aufbau unkomplizierte Elektroden eingesetzt werden, die Aufladespannung unter +/- 20 kV gesenkt wird und die Beschichtung an allen Stellen in der Wirbelschicht gleichmäßig erfolgt.It is an object of the invention, a method and an apparatus for electrostatic coating of objects with Develop powder particles in a fluidized bed, where in the Building uncomplicated electrodes can be used Charging voltage is reduced below +/- 20 kV and the Coating uniformly at all points in the fluidized bed he follows.
Die Aufgabe wird dadurch gelöst, daß erfindungsgemäß in an sich bekannter Weise eine fluidisierte Pulverschicht über einem porösen Anströmboden angeordnet ist. In ihr sind an den vier Wänden des Tauchbeckens über einen Schutzwiderstand von 10⁹ Ohm an Hochspannung 3 kV ≦ +/- U < 20 kV liegende Wabenelektroden, die oben und unten verschlossen sind, angeordnet. Außerdem kann für komplizierte Gegenstände eine zusätzliche Wabenelektrode, die von Wand zu Wand reicht und beweglich ist, in der Wirbelschicht eingebaut sein. Damit kann der Beschichtungsraum verkleinert werden, es steigt die Aufladefeldstärke, und die Beschichtung wird verbessert. Hat eine Drahtware, die beschichtet werden soll, gekrümmte Drähte, wie z. B. bei Spüleneinsätzen, kann eine Elektrode in der Krümmung angeordnet werden, wobei ebenfalls ein besseres Beschichtungsergebnis erreicht wird. Die Wabenelektroden haben Querstege, an denen an der Elektrodenoberfläche den Kreuzungspunkten eine besonders hohe Feldstärke auftritt, welche den Beschichtungseffekt noch verstärkt ähnlich Koronaspitzen. Der spezifische Durchgangswiderstand liegt bei den Elektroden zwischen 10¹ Ohm cm und 10² Ohm cm und der spezifische Oberflächenwiderstand zwischen 10² Ohm und 10³ Ohm. Wird in die fluidisierte Pulverschicht ein Gegenstand, z. B. ein Rohr, eingetaucht, erhält man eine Beschichtung bis zur Oberfläche des Pulvers.The object is achieved in that according to the invention in itself known a fluidized powder layer over a porous inflow floor is arranged. There are four in it Walls of the plunge pool over a protective resistance of 10⁹ ohms honeycomb electrodes connected to high voltage 3 kV ≦ +/- U <20 kV, which are closed at the top and bottom. Besides, can an additional honeycomb electrode for complicated objects, that extends from wall to wall and is movable in the Fluidized bed must be installed. So that the coating room be reduced, the charging field strength increases, and the Coating is improved. Has wire goods that to be coated, curved wires such. B. at Sink inserts, an electrode can be arranged in the curve be, also a better coating result is achieved. The honeycomb electrodes have cross bars on which a special point on the electrode surface high field strength occurs, which still affects the coating effect reinforced like corona tips. The specific one Volume resistance for the electrodes is between 10 1 ohm cm and 10² ohm cm and the surface resistivity between 10² ohms and 10³ ohms. Will be in the fluidized powder layer Object, e.g. B. a tube, immersed, you get one Coating up to the surface of the powder.
Durch Hin- und Herbewegung oder kreisende Bewegungen des Gegenstandes entstehen zwischen Gegenstand und fluidisierter Pulverschicht kleine kurzzeitige Luftspalte, aus denen eine Pulverwolke austritt. Diese Pulverwolke beschichtet den Gegenstand zusätzlich auch oberhalb der fluidisierten Pulverschicht. By moving back and forth or circular movements of the Object arise between object and fluidized Powder layer small short-term air gaps, one of which Powder cloud emerges. This powder cloud coats the Item also above the fluidized Powder layer.
Die Erfindung wird nachstehend an einem Ausführungsbeispiel näher erläutert.The invention is illustrated below using an exemplary embodiment explained in more detail.
Fig. 1 zeigt die Vorrichtung zur Durchführung des Verfahrens gemäß der Erfindung. Fig. 1 shows the device for performing the method according to the invention.
In einem Tauchbecken 1 wird über einen porösen Anströmboden 2 in den Anströmraum 3 über die Luftzuführung 4 Luft geblasen. Dadurch bildet sich eine fluidisierte Pulverschicht 5 aus. In der fluidisierten Pulverschicht 5 befinden sich Wabenelektroden 6, die oben und unten verschlossen sind und einen Hochspannungsanschluß 7 besitzen. Wird ein Werkstuck S in die aufgeladene fluidisierte Pulverschicht 5 getaucht, wird es beschichtet.In a plunge pool 1 , air is blown through a porous inflow base 2 into the inflow space 3 via the air supply 4 . This forms a fluidized powder layer 5 . In the fluidized powder layer 5 are honeycomb electrodes 6, which are closed up and down and have a high voltage terminal. 7 If a workpiece S is immersed in the charged fluidized powder layer 5 , it is coated.
Fig. 2 zeigt einen Schnitt durch eine Wabenelektrode 6 der Fig. 1. Die Wabenelektrode 6 besitzt Stege 9, die in den Kreuzungspunkten 11 auf die Wand 10 treffen. FIG. 2 shows a section through a honeycomb electrode 6 from FIG. 1. The honeycomb electrode 6 has webs 9 which meet the wall 10 at the crossing points 11 .
Fig. 3 zeigt das Tauchbecken 1 mit vier Wabenelektroden 6, zwischen denen sich eine weitere Wabenelektrode 12 bewegen läßt. Fig. 4 zeigt das Tauchbecken 1 mit den Wabenelektroden 6, einem eingetauchten Werkstück S und einer Zusatzelektrode 13. Fig. 3 shows the plunge pool 1 with four honeycomb electrodes 6 , between which a further honeycomb electrode 12 can be moved. Fig. 4 shows the dip tank 1 with the honeycomb electrode 6, a submerged workpiece S and an auxiliary electrode 13.
BezugszeichenlisteReference list
1 Tauchbecken
2 Anströmboden
3 Anströmraum
4 Luftzuführung
5 fluidisierte Pulverschicht
6 Wabenelektrode
7 Hochspannungsanschluß
8 Werkstück
9 Steg
10 Wand
11 Kreuzungspunkt
12 Wabenelektrode
13 Zusatzelektrode 1 plunge pool
2 inflow floor
3 inflow space
4 air supply
5 fluidized powder layer
6 honeycomb electrode
7 high voltage connection
8 workpiece
9 bridge
10 wall
11 crossing point
12 honeycomb electrode
13 additional electrode
Claims (8)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1996116695 DE19616695A1 (en) | 1996-04-26 | 1996-04-26 | Electrostatic spray coating of objects with powder |
DE1996125135 DE19625135A1 (en) | 1996-04-26 | 1996-06-18 | Electrostatic internal powder coating |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1996116695 DE19616695A1 (en) | 1996-04-26 | 1996-04-26 | Electrostatic spray coating of objects with powder |
Publications (1)
Publication Number | Publication Date |
---|---|
DE19616695A1 true DE19616695A1 (en) | 1997-11-06 |
Family
ID=7792518
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE1996116695 Withdrawn DE19616695A1 (en) | 1996-04-26 | 1996-04-26 | Electrostatic spray coating of objects with powder |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE19616695A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1999030838A1 (en) * | 1997-12-17 | 1999-06-24 | International Coatings Limited | Powder coating process |
EP2472545A1 (en) * | 2009-08-26 | 2012-07-04 | Panasonic Corporation | Discharge device and electrostatic atomization device comprising same |
DE102011055980A1 (en) * | 2011-12-02 | 2013-06-06 | Benteler Automobiltechnik Gmbh | Method for coating metal structural part i.e. motor car stabilizer, involves generating powder cloud from coating powder, and carrying out metal structural part by powder cloud, where metal structural part to be coated is deposited |
-
1996
- 1996-04-26 DE DE1996116695 patent/DE19616695A1/en not_active Withdrawn
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1999030838A1 (en) * | 1997-12-17 | 1999-06-24 | International Coatings Limited | Powder coating process |
GB2347367A (en) * | 1997-12-17 | 2000-09-06 | Int Coatings Ltd | Powder coating process |
US6280798B1 (en) | 1997-12-17 | 2001-08-28 | International Coatings Limited | Fluidized bed powder coating process utilizing tribostatic charging |
GB2347367B (en) * | 1997-12-17 | 2002-01-09 | Int Coatings Ltd | Powder coating process |
EP2472545A1 (en) * | 2009-08-26 | 2012-07-04 | Panasonic Corporation | Discharge device and electrostatic atomization device comprising same |
EP2472545A4 (en) * | 2009-08-26 | 2013-01-02 | Panasonic Corp | Discharge device and electrostatic atomization device comprising same |
DE102011055980A1 (en) * | 2011-12-02 | 2013-06-06 | Benteler Automobiltechnik Gmbh | Method for coating metal structural part i.e. motor car stabilizer, involves generating powder cloud from coating powder, and carrying out metal structural part by powder cloud, where metal structural part to be coated is deposited |
DE102011055980B4 (en) * | 2011-12-02 | 2014-10-16 | Benteler Automobiltechnik Gmbh | Process for coating metal components and plant for carrying out the process |
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Legal Events
Date | Code | Title | Description |
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OP8 | Request for examination as to paragraph 44 patent law | ||
8122 | Nonbinding interest in granting licenses declared | ||
AG | Has addition no. |
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