EP0891817A2 - Method for electrostatic coating - Google Patents
Method for electrostatic coating Download PDFInfo
- Publication number
- EP0891817A2 EP0891817A2 EP98111127A EP98111127A EP0891817A2 EP 0891817 A2 EP0891817 A2 EP 0891817A2 EP 98111127 A EP98111127 A EP 98111127A EP 98111127 A EP98111127 A EP 98111127A EP 0891817 A2 EP0891817 A2 EP 0891817A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- applicators
- particles
- charge
- powder
- electrical charge
- 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- Withdrawn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
Images
Classifications
-
- 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
- B05B5/002—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means comprising means for neutralising the spray of charged droplets or particules
- B05B5/003—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means comprising means for neutralising the spray of charged droplets or particules by mixing two sprays of opposite polarity
-
- 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
- B05B5/002—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means comprising means for neutralising the spray of charged droplets or particules
- B05B5/004—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means comprising means for neutralising the spray of charged droplets or particules by alternating the polarity of the spray
-
- 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
-
- 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
- B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
- B05D1/04—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field
- B05D1/06—Applying particulate materials
-
- 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
- B05B5/047—Discharge apparatus, e.g. electrostatic spray guns using tribo-charging
Definitions
- the invention relates to a method for the electrostatic coating of Workpieces with powder materials.
- Layer thickness is generally less than 500 ⁇ m because the charge already applied powder particles to subsequent powder particles of the same name repulsive. For many technical applications, for example electrical or thermal insulation layers, the layer thickness that can be achieved in this way is not sufficient. A multiple coating with layer internal is then necessary.
- the invention has for its object to provide a method with which in a Working step a desired greater layer thickness can be achieved.
- Powder spraying devices suitable for carrying out the method are, for example known from DE 195 42 863 A1.
- a simultaneous or alternating Spraying of positively charged powder and negatively charged powder can by arranging at least one corona spray gun and at least one tribo spray gun can be achieved.
- one is earthed Workpiece arranged and there are at least two applicators 1, 2.
- Figure 1 shows a first method variant in which a one-component coating material 1 by means of two electrostatic, referred to as applicators 1, 2 Application equipment is applied.
- the applicator 1 sprays positively charged particles of the coating material 1 and the applicator 2 negatively charged particles the workpiece.
- the applicators 1, 2 work simultaneously. Instead of two applicators can also use several applicators with different particles Apply cargo. By the simultaneous deposition of particles of different electrical charge, the surface charge is lower than with a coating with particles of only one charge. The achievable powder layer thickness is thereby higher.
- FIG. 2 shows a second variant, two applicators 1, 2 likewise being used simultaneously spray, but a first material component, referred to as coating material 1, e.g. is positively charged, and a second, as a coating material 2 designated material component is negatively charged.
- a first material component referred to as coating material 1
- a second as a coating material 2 designated material component is negatively charged.
- thermoplastics filled with mica are made from thermoplastics filled with mica.
- At co-powder coating is e.g. a polymer powder with a tribospray gun applied. The powder particles are charged positively. The mica particles are simultaneously e.g. applied with a corona spray gun. With this type of electrostatic powder application negatively charges the mica particles.
- the Layer composition i.e. the mica content, is determined by coordinating the Powder mass flows controlled.
- FIG. 3 shows a third variant of the method, the same as for the second variant of the method two different materials with different electrical charges be applied.
- the alternating coating with positive and negatively charged particles is repeated until the desired total layer thickness is reached. A greater total layer thickness is also achieved here than through Spraying particles of only a uniform charge would be possible.
- the third method variant can also be used for coating with a one-component Coating material are used, alternating particles of the same type, but with different charges (not in the drawing shown).
Landscapes
- Application Of Or Painting With Fluid Materials (AREA)
- Paints Or Removers (AREA)
Abstract
Description
Die Erfindung bezieht sich auf ein Verfahren zum elektrostatischen Beschichten von Werkstücken mit Pulvermaterialien.The invention relates to a method for the electrostatic coating of Workpieces with powder materials.
Beim elektrostatischen Pulversprühen wird auf die Pulverteilchen eine positive oder negative elektrische Ladung aufgebracht. Die mit einem Beschichtungsvorgang erzielbare Schichtdicke ist im allgemeinen geringer als 500 µm, da die Ladung bereits aufgebrachter Pulverteilchen auf nachfolgende gleichnamig geladene Pulverteilchen abstoßend wirkt. Für viele technische Anwendungen, beispielsweise elektrische oder thermische Isolierschichten, ist die so erreichbare Schichtdicke nicht ausreichend. Es ist dann ein mehrfaches Beschichten mit Schichtsintern notwendig.In electrostatic powder spraying, a positive or negative electrical charge applied. The one that can be achieved with a coating process Layer thickness is generally less than 500 µm because the charge already applied powder particles to subsequent powder particles of the same name repulsive. For many technical applications, for example electrical or thermal insulation layers, the layer thickness that can be achieved in this way is not sufficient. A multiple coating with layer internal is then necessary.
Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren anzugeben, mit dem in einem Arbeitsgang eine gewünschte größere Schichtdicke erreicht werden kann.The invention has for its object to provide a method with which in a Working step a desired greater layer thickness can be achieved.
Diese Aufgabe wird durch ein Verfahren mit den im Anspruch 1 angegebenen
Merkmalen gelöst. Verfahrensvarianten und -ausgestaltungen sind in weiteren Ansprüchen
angegeben.This object is achieved by a method with those specified in
Zur Durchführung des Verfahrens geeignete Pulversprüheinrichtungen sind beispielsweise aus der DE 195 42 863 A1 bekannt. Ein gleichzeitiges oder alternierendes Sprühen von positiv geladenem Pulver und negativ geladenem Pulver kann durch Anordnung wenigstens einer Coronaspritzpistole und wenigstens einer Tribospritzpistole erreicht werden.Powder spraying devices suitable for carrying out the method are, for example known from DE 195 42 863 A1. A simultaneous or alternating Spraying of positively charged powder and negatively charged powder can by arranging at least one corona spray gun and at least one tribo spray gun can be achieved.
Die Erfindung wird nachstehend anhand der in Zeichnungsfiguren dargestellten Verfahrensvarianten näher erläutert.The invention is illustrated below with reference to that in the drawing figures Process variants explained in more detail.
Es zeigt:
- Fig. 1
- einen Beschichtungsvorgang, bei dem ein einkomponentiges Beschichtungsmaterial aufgebracht wird,
- Fig. 2
- einen Beschichtungsvorgang, bei dem ein zweikomponentiges Beschichtungsmaterial aufgebracht wird, und
- Fig. 3
- einen Beschichtungsvorgang, bei dem Materialschichten mit unterschiedlicher elektrischer Ladung alternierend aufgesprüht werden.
- Fig. 1
- a coating process in which a one-component coating material is applied,
- Fig. 2
- a coating process in which a two-component coating material is applied, and
- Fig. 3
- a coating process in which layers of material with different electrical charges are sprayed alternately.
Zur Durchführung der unterschiedlichen Verfahrensvarianten ist jeweils ein geerdetes
Werkstück angeordnet und es sind mindestens zwei Applikatoren 1, 2 vorhanden.To carry out the different process variants, one is earthed
Workpiece arranged and there are at least two
Figur 1 zeigt eine erste Verfahrensvariante, bei der ein einkomponentiges Beschichtungsmaterial
1 mittels zweier, als Applikatoren 1, 2 bezeichneter elektrostatischer
Auftragsgeräte aufgebracht wird. Der Applikator 1 sprüht positiv geladene Partikel
des Beschichtungsmaterials 1 und der Applikator 2 negativ geladene Partikel auf
das Werkstück. Die Applikatoren 1, 2 arbeiten gleichzeitig. Anstelle von zwei Applikatoren
können auch mehrere Applikatoren zugleich Partikel mit unterschiedlicher
Ladung aufbringen. Durch die gleichzeitige Ablagerung von Partikeln unterschiedlicher
elektrischer Ladung ist die Oberflächenladung geringer als bei einer Beschichtung
mit Partikeln nur einer Ladung. Die erreichbare Pulverschichtdicke ist dadurch
höher.Figure 1 shows a first method variant in which a one-
Figur 2 zeigt eine zweite Variante, wobei ebenfalls zwei Applikatoren 1, 2 gleichzeitig
sprühen, jedoch eine erste, als Beschichtungsmaterial 1 bezeichnete Materialkomponente,
z.B. positiv aufgeladen wird, und eine zweite, als Beschichtungsmaterial
2 bezeichnete Materialkomponente negativ aufgeladen wird. FIG. 2 shows a second variant, two
Nach einem solchen Verfahren kann beispielsweise eine elektrische Isolation von Kupferleitern durch mit Glimmer gefüllten Thermoplasten hergestellt werden. Bei dem Co-Pulverbeschichten wird z.B. ein Polymerpulver mit einer Tribospritzpistole aufgetragen. Die Pulverpartikel werden hierbei positiv geladen. Die Glimmerpartikel werden gleichzeitig z.B. mit einer Coronaspritzpistole aufgetragen. Bei dieser Art der elektrostatischen Pulverauftragung laden sich die Glimmerteilchen negativ auf. Die Schichtzusammensetzung, also der Glimmeranteil, wird durch eine Abstimmung der Pulvermassenströme kontrolliert.According to such a method, electrical insulation of Copper conductors are made from thermoplastics filled with mica. At co-powder coating is e.g. a polymer powder with a tribospray gun applied. The powder particles are charged positively. The mica particles are simultaneously e.g. applied with a corona spray gun. With this type of electrostatic powder application negatively charges the mica particles. The Layer composition, i.e. the mica content, is determined by coordinating the Powder mass flows controlled.
Figur 3 zeigt eine dritte Verfahrensvariante, wobei wie bei der zweiten Verfahrensvariante
zwei verschiedene Materialien mit unterschiedlicher elektrischer Ladung
aufgebracht werden. Die Beschichtungsmaterialien 1, 2 werden jedoch alternierend
in relativ dünnen Schichten aufgebracht, beginnend z.B. mit einer Beschichtung mit
dem Material 1, wie im oberen Teil der Figur 3 dargestellt ist. Anschließend wird
eine Schicht des zweiten Materials aufgebracht, das eine andere Ladung hat, wie im
unteren Teil der Figur 3 gezeigt. Die abwechselnde Beschichtung mit positiv und
negativ geladenen Teilchen wird wiederholt, bis die gewünschte Gesamtschichtdicke
erreicht ist. Auch dabei wird eine größere Gesamtschichtdicke erreicht, als durch
Aufsprühen von Partikeln nur einer einheitlichen Ladung möglich wäre.FIG. 3 shows a third variant of the method, the same as for the second variant of the method
two different materials with different electrical charges
be applied. The
Die dritte Verfahrensvariante kann auch zur Beschichtung mit einem einkomponentigen Beschichtungsmaterial genutzt werden, wobei abwechselnd gleichartige Partikel, jedoch mit unterschiedlicher Ladung aufgebracht werden (nicht in der Zeichnung dargestellt).The third method variant can also be used for coating with a one-component Coating material are used, alternating particles of the same type, but with different charges (not in the drawing shown).
Claims (5)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19730231 | 1997-07-15 | ||
DE19730231A DE19730231A1 (en) | 1997-07-15 | 1997-07-15 | Process for electrostatic coating |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0891817A2 true EP0891817A2 (en) | 1999-01-20 |
EP0891817A3 EP0891817A3 (en) | 1999-05-26 |
Family
ID=7835727
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98111127A Withdrawn EP0891817A3 (en) | 1997-07-15 | 1998-06-17 | Method for electrostatic coating |
Country Status (5)
Country | Link |
---|---|
US (1) | US6032871A (en) |
EP (1) | EP0891817A3 (en) |
JP (1) | JPH1190309A (en) |
CA (1) | CA2243031A1 (en) |
DE (1) | DE19730231A1 (en) |
Cited By (7)
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---|---|---|---|---|
WO2000064592A1 (en) * | 1999-04-27 | 2000-11-02 | Microdose Technologies, Inc. | Method and apparatus for producing uniform small portions of fine powders and articles thereof |
US6428809B1 (en) | 1999-08-18 | 2002-08-06 | Microdose Technologies, Inc. | Metering and packaging of controlled release medication |
WO2005011091A1 (en) * | 2003-07-22 | 2005-02-03 | Robert Bosch Gmbh | Method for applying an electrical insulation |
WO2010054985A1 (en) * | 2008-11-12 | 2010-05-20 | Chemetall Gmbh | Method for coating surfaces with particles and use of the coatings produced by this method |
ITRM20090039A1 (en) * | 2009-01-29 | 2010-07-30 | Uni Degli Studi Di Roma To R Vergata | SOLID MICRO OR NANOPARTICLE DISPERSION SYSTEM IN A LIQUID PHASE |
US9974909B2 (en) | 2010-01-05 | 2018-05-22 | Microdose Therapeutx, Inc. | Inhalation device and method |
EP4245426A1 (en) * | 2022-03-16 | 2023-09-20 | Enviral Oberflächenveredelung GmbH | Optimised powder coating technique for the coating of metal surfaces |
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US6952504B2 (en) * | 2001-12-21 | 2005-10-04 | Neophotonics Corporation | Three dimensional engineering of planar optical structures |
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US6919054B2 (en) * | 2002-04-10 | 2005-07-19 | Neophotonics Corporation | Reactant nozzles within flowing reactors |
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US7575784B1 (en) * | 2000-10-17 | 2009-08-18 | Nanogram Corporation | Coating formation by reactive deposition |
US20090075083A1 (en) * | 1997-07-21 | 2009-03-19 | Nanogram Corporation | Nanoparticle production and corresponding structures |
US20040011901A1 (en) * | 2000-07-10 | 2004-01-22 | Rehman William R. | Unipolarity powder coating systems including improved tribocharging and corona guns |
US20030038193A1 (en) * | 2000-07-11 | 2003-02-27 | Rehman William R. | Unipolarity powder coating systems including improved tribocharging and corona guns |
US6645300B2 (en) | 2000-07-11 | 2003-11-11 | Nordson Corporation | Unipolarity powder coating systems including improved tribocharging and corona guns |
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JP2002066443A (en) * | 2000-08-29 | 2002-03-05 | Kansai Paint Co Ltd | Coating film forming method |
KR100934679B1 (en) * | 2000-10-17 | 2009-12-31 | 네오포토닉스 코포레이션 | Coating Formation by Reactive Deposition |
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US20070087048A1 (en) * | 2001-05-31 | 2007-04-19 | Abrams Andrew L | Oral dosage combination pharmaceutical packaging |
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US20040159282A1 (en) * | 2002-05-06 | 2004-08-19 | Sanner Michael R | Unipolarity powder coating systems including improved tribocharging and corona guns |
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US6817553B2 (en) * | 2003-02-04 | 2004-11-16 | Efc Systems, Inc. | Powder paint spray coating apparatus having selectable, modular spray applicators |
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US20080081112A1 (en) * | 2006-09-29 | 2008-04-03 | Paul Brabant | Batch reaction chamber employing separate zones for radiant heating and resistive heating |
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US8439033B2 (en) | 2007-10-09 | 2013-05-14 | Microdose Therapeutx, Inc. | Inhalation device |
US8413914B2 (en) | 2010-03-04 | 2013-04-09 | Hanson Group, Llc | Electrostatic fast-set sprayable polymer system and process |
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US8715787B2 (en) * | 2011-05-24 | 2014-05-06 | Alfonz Morav{hacek over (c)}ík | Method of making a compact layer of enamel coatings on moulded products |
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JP2018069157A (en) * | 2016-10-28 | 2018-05-10 | 有光工業株式会社 | Electrostatic atomization device, flying unit, and electrostatic atomization method |
CN115106263A (en) * | 2022-07-20 | 2022-09-27 | 陈凡 | Spraying method capable of enabling coating to meet high-voltage insulation requirement |
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-
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- 1998-06-17 EP EP98111127A patent/EP0891817A3/en not_active Withdrawn
- 1998-07-13 CA CA002243031A patent/CA2243031A1/en not_active Abandoned
- 1998-07-14 JP JP10199300A patent/JPH1190309A/en active Pending
- 1998-07-15 US US09/115,880 patent/US6032871A/en not_active Expired - Fee Related
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JPS60227852A (en) * | 1984-04-26 | 1985-11-13 | Hitachi Plant Eng & Constr Co Ltd | Electrostatic agricultural chemical sprinkler |
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Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000064592A1 (en) * | 1999-04-27 | 2000-11-02 | Microdose Technologies, Inc. | Method and apparatus for producing uniform small portions of fine powders and articles thereof |
US6428809B1 (en) | 1999-08-18 | 2002-08-06 | Microdose Technologies, Inc. | Metering and packaging of controlled release medication |
US6702683B2 (en) | 1999-08-18 | 2004-03-09 | Microdose Technologies, Inc. | Metering and packaging of controlled release medication |
US7404968B2 (en) | 1999-08-18 | 2008-07-29 | Microdose Technologies, Inc. | Metering and packaging of controlled release medication |
WO2005011091A1 (en) * | 2003-07-22 | 2005-02-03 | Robert Bosch Gmbh | Method for applying an electrical insulation |
US7572488B2 (en) | 2003-07-22 | 2009-08-11 | Robert Bosch Gmbh | Method for applying an electrical insulation |
WO2010054985A1 (en) * | 2008-11-12 | 2010-05-20 | Chemetall Gmbh | Method for coating surfaces with particles and use of the coatings produced by this method |
ITRM20090039A1 (en) * | 2009-01-29 | 2010-07-30 | Uni Degli Studi Di Roma To R Vergata | SOLID MICRO OR NANOPARTICLE DISPERSION SYSTEM IN A LIQUID PHASE |
US9974909B2 (en) | 2010-01-05 | 2018-05-22 | Microdose Therapeutx, Inc. | Inhalation device and method |
US10434267B2 (en) | 2010-01-05 | 2019-10-08 | Microdose Therapeutx, Inc. | Inhalation device and method |
EP4245426A1 (en) * | 2022-03-16 | 2023-09-20 | Enviral Oberflächenveredelung GmbH | Optimised powder coating technique for the coating of metal surfaces |
Also Published As
Publication number | Publication date |
---|---|
US6032871A (en) | 2000-03-07 |
EP0891817A3 (en) | 1999-05-26 |
JPH1190309A (en) | 1999-04-06 |
CA2243031A1 (en) | 1999-01-15 |
DE19730231A1 (en) | 1999-01-21 |
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