EP0437383A1 - Verfahren und Vorrichtung zum elektrostatischen Spritzlackieren von Kunststoffgegenständen - Google Patents

Verfahren und Vorrichtung zum elektrostatischen Spritzlackieren von Kunststoffgegenständen Download PDF

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Publication number
EP0437383A1
EP0437383A1 EP91400012A EP91400012A EP0437383A1 EP 0437383 A1 EP0437383 A1 EP 0437383A1 EP 91400012 A EP91400012 A EP 91400012A EP 91400012 A EP91400012 A EP 91400012A EP 0437383 A1 EP0437383 A1 EP 0437383A1
Authority
EP
European Patent Office
Prior art keywords
face
painted
air
paint
electrode
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Withdrawn
Application number
EP91400012A
Other languages
English (en)
French (fr)
Inventor
Roland Coelho
Nasreddine Bouguila
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Renault SAS
Regie Nationale des Usines Renault
Original Assignee
Renault SAS
Regie Nationale des Usines Renault
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from FR9000324A external-priority patent/FR2657030B1/fr
Priority claimed from FR9014025A external-priority patent/FR2668955B1/fr
Application filed by Renault SAS, Regie Nationale des Usines Renault filed Critical Renault SAS
Publication of EP0437383A1 publication Critical patent/EP0437383A1/de
Withdrawn legal-status Critical Current

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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
    • B05B5/08—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
    • 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
    • B05D1/045—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field on non-conductive substrates
    • 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
    • B05D2201/00—Polymeric substrate or laminate
    • B05D2201/02—Polymeric substrate

Definitions

  • the present invention relates to a method and a device for electrostatic painting on plastic parts.
  • US Patent 2,698,814 proposes methods making it possible to limit - by compensation with charges of opposite sign - the accumulation of charges which accompanies the deposition of paint on an insulating surface.
  • the compensating charge generator is placed on the same side of the surface to be painted as the paint atomizer. This process is not suitable for certain shapes of parts, and the deposition of compensating charges disturbs the deposition of paint on the surface.
  • the present invention aims to provide a method and a device for electrostatic painting of surfaces of plastic parts.
  • the method according to the invention consists in applying the paint electrostatically to one face of the part, and it is characterized in that it consists in creating a crown discharge on the opposite face of the face to be painted with the part made of plastic.
  • the method consists in creating the jet of ionized air by producing a metal corona discharge brought to a high alternating voltage at the top of a point and by entraining the ions in a jet of air through a small nozzle.
  • the device according to the invention is characterized in that it comprises an electrostatic paint applicator arranged on the side of the face to be painted and an air ionization device arranged on the side of the opposite face of the face to be painted .
  • the air ionization apparatus comprises a metal tip brought to an alternating high voltage producing an alternating corona discharge, and an air jet leaving a small nozzle and ensuring the entrainment of the ions.
  • the painting device comprises an electrostatic paint applicator 1 disposed on the side of the face to be painted of the plastic part and an electrode directly connected to ground, on the side of the opposite face of the face to to paint.
  • FIG. 1 is a diagram of an embodiment of the device according to the invention.
  • FIG. 2 is a diagram of the ion generator.
  • FIG. 4 is a diagram of another embodiment of the device according to the invention.
  • the device comprises an applicator 1 of electrostatic paint (minibol) sending paint on the face 21 of the part to be painted 2.
  • This applicator known per se, sends particles loaded with paint by an air jet towards room 2.
  • FIG. 2 Behind the workpiece 2 is arranged a device 3 producing a flow of ionized air.
  • This device known per se, is called an "ionizer”. It is shown diagrammatically in FIG. 2.
  • This device is arranged on the side of the face 22 opposite the face 21 to be painted. It produces a generally neutral ionized air jet. Its principle is based on the production of an alternative corona discharge at the top of a metal tip 35 brought to high voltage, and the entrainment of the ions by an air jet through a small metal nozzle 36.
  • the nozzle 36 in which is housed the metal tip is provided with a compressed air inlet 34.
  • the tip is connected via an insulating passage 33 to a shielded cable 32 connected to a high-voltage alternating generator 31.
  • the assembly is connected to the earth.
  • the air thus enriched in ions is conductive, so that the face 22 of the part is connected to the ground by means of the low resistance of the jet of conductive air.
  • the ionizer 3 is supplied with compressed air at a few bars.
  • the "corona" tip 35 is supplied by high voltage alternating at the mains frequency by means of a HV transformer in series with an auto-transformer, so that the voltage on the "corona” tip 35 is of the order of 10,000 Volts peak / peak ( ⁇ 3,500 Volts effective) sufficient to initiate ionization of the air at the tip at each half-wave.
  • the jet of ionized air created opposite the area to be painted a counter-electrode having a low resistance compared to the earth.
  • FIG. 3 shows a deposition of paint which is both immediate and uniform throughout the impact zone of the jet of the ionizer.
  • the device comprises an applicator 1 of electrostatic paint (minibol) sending paint on the face 21 of the part to be painted 2.
  • This applicator known per se, sends the particles loaded with paint towards the part to be painted 2, by a jet of compressed air arriving at 11.
  • This part to be painted 2 is made of plastic material or of insulating material.
  • This electrode 3 is arranged on the side of the face 22 opposite the face 21 to be painted at a short distance from the part.
  • a distance between the tip and the workpiece of the order of 10 cm gives satisfactory results.
  • It consists of at least one tip 3 connected directly by means of a cable 32 to ground.
  • the radius of curvature of the tip is advantageously less than 0.1 mm.
  • the electrode or tip 3 is housed in a protective box 4 forming with the part 2 an enclosure impermeable to paint droplets.
  • Plastic plates of the type known under the trade name Noryl and of polypropylene were painted in the presence of an electrode 3 placed at a short distance from the sample.
  • the electrode 3 can be made up of a plurality of points 3 connected directly to the ground as a function of the parts treated.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
EP91400012A 1990-01-12 1991-01-04 Verfahren und Vorrichtung zum elektrostatischen Spritzlackieren von Kunststoffgegenständen Withdrawn EP0437383A1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FR9000324A FR2657030B1 (fr) 1990-01-12 1990-01-12 Procede et dispositif de peinture electrostatique sur pieces plastiques.
FR9000324 1990-01-12
FR9014025A FR2668955B1 (fr) 1990-11-13 1990-11-13 Procede et dispositif de peinture electrostatique sur pieces plastiques.
FR9014025 1990-11-13

Publications (1)

Publication Number Publication Date
EP0437383A1 true EP0437383A1 (de) 1991-07-17

Family

ID=26227792

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91400012A Withdrawn EP0437383A1 (de) 1990-01-12 1991-01-04 Verfahren und Vorrichtung zum elektrostatischen Spritzlackieren von Kunststoffgegenständen

Country Status (2)

Country Link
EP (1) EP0437383A1 (de)
CA (1) CA2034120A1 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998009734A1 (de) * 1996-09-06 1998-03-12 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Verfahren und vorrichtung zur elektrostatischen beschichtung von substraten
DE19730231A1 (de) * 1997-07-15 1999-01-21 Abb Research Ltd Verfahren zum elektrostatischen Beschichten
WO2001032318A2 (en) * 1999-10-29 2001-05-10 Kimberly-Clark Worldwide, Inc. Method for application of a fluid on a substrate formed as a film or web
GB2395451A (en) * 2002-11-19 2004-05-26 Ward Aylis Haviland Electrostatic coating process
WO2014095081A3 (de) * 2012-12-20 2014-08-14 Thomas Mayer Druckgasaufbereitungssystem und druckgasbetriebene beschichtungsanlage
NL2010830C2 (en) * 2013-05-21 2014-11-26 Alvimedica Vascular Res B V Method and device for depositing a material on a target and medical device obstainable therewith.

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2698814A (en) * 1952-05-01 1955-01-04 Ransburg Electro Coating Corp Electrostatic coating apparatus and method
GB1174112A (en) * 1966-01-04 1969-12-10 Ford Motor Co Electrostatic Spray Painting Method
FR2285933A1 (fr) * 1974-09-30 1976-04-23 Alfo Ag Procede et dispositif pour l'application electrostatique de revetements de poudres
FR2550963A1 (fr) * 1983-08-29 1985-03-01 Spengler Walter Installation d'enduction electrostatique
DE3611729A1 (de) * 1986-04-08 1987-10-15 Ransburg Gmbh Fluessigkeitssprueheinrichtung zum bespruehen von leder
EP0297520A2 (de) * 1987-07-01 1989-01-04 Herberts Gesellschaft mit beschränkter Haftung Verfahren und Vorrichtung zum Lackieren von Werkstücken mit elektrisch isolierender Oberfläche durch elektrostatischen Auftrag bzw. Spritzauftrag
EP0350606A2 (de) * 1988-07-13 1990-01-17 Eltex-Elektrostatik Gesellschaft mbH Vorrichtung zum Befeuchten eines bewegten Substrates

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2698814A (en) * 1952-05-01 1955-01-04 Ransburg Electro Coating Corp Electrostatic coating apparatus and method
GB1174112A (en) * 1966-01-04 1969-12-10 Ford Motor Co Electrostatic Spray Painting Method
FR2285933A1 (fr) * 1974-09-30 1976-04-23 Alfo Ag Procede et dispositif pour l'application electrostatique de revetements de poudres
FR2550963A1 (fr) * 1983-08-29 1985-03-01 Spengler Walter Installation d'enduction electrostatique
DE3611729A1 (de) * 1986-04-08 1987-10-15 Ransburg Gmbh Fluessigkeitssprueheinrichtung zum bespruehen von leder
EP0297520A2 (de) * 1987-07-01 1989-01-04 Herberts Gesellschaft mit beschränkter Haftung Verfahren und Vorrichtung zum Lackieren von Werkstücken mit elektrisch isolierender Oberfläche durch elektrostatischen Auftrag bzw. Spritzauftrag
EP0350606A2 (de) * 1988-07-13 1990-01-17 Eltex-Elektrostatik Gesellschaft mbH Vorrichtung zum Befeuchten eines bewegten Substrates

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998009734A1 (de) * 1996-09-06 1998-03-12 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Verfahren und vorrichtung zur elektrostatischen beschichtung von substraten
DE19636234A1 (de) * 1996-09-06 1998-03-12 Fraunhofer Ges Forschung Verfahren und Vorrichtung zur elektrostatischen Beschichtung von Substraten
DE19636234C2 (de) * 1996-09-06 2001-05-03 Fraunhofer Ges Forschung Verfahren und Vorrichtung zur elektrostatischen Beschichtung von Substraten
DE19636234C5 (de) * 1996-09-06 2005-02-17 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Verfahren und Vorrichtung zur elektrostatischen Beschichtung von Substraten
DE19730231A1 (de) * 1997-07-15 1999-01-21 Abb Research Ltd Verfahren zum elektrostatischen Beschichten
US6032871A (en) * 1997-07-15 2000-03-07 Abb Research Ltd. Electrostatic coating process
US6506456B1 (en) 1999-10-29 2003-01-14 Kimberly-Clark Worldwide, Inc. Method for application of a fluid on a substrate formed as a film or web
GB2372000A (en) * 1999-10-29 2002-08-14 Kimberly Clark Co Method for application of a fluid on a substrate formed as a film or web
WO2001032318A3 (en) * 1999-10-29 2001-12-13 Kimberly Clark Co Method for application of a fluid on a substrate formed as a film or web
GB2372000B (en) * 1999-10-29 2004-03-03 Kimberly Clark Co Method for application of a fluid on a substrate formed as a film or web
WO2001032318A2 (en) * 1999-10-29 2001-05-10 Kimberly-Clark Worldwide, Inc. Method for application of a fluid on a substrate formed as a film or web
GB2395451A (en) * 2002-11-19 2004-05-26 Ward Aylis Haviland Electrostatic coating process
WO2014095081A3 (de) * 2012-12-20 2014-08-14 Thomas Mayer Druckgasaufbereitungssystem und druckgasbetriebene beschichtungsanlage
CN105228727A (zh) * 2012-12-20 2016-01-06 托马斯·迈尔 压缩气体准备***以及压缩气体运行的涂层机组
CN105228727B (zh) * 2012-12-20 2018-11-13 托马斯·迈尔 压缩气体准备***以及压缩气体运行的涂层机组
NL2010830C2 (en) * 2013-05-21 2014-11-26 Alvimedica Vascular Res B V Method and device for depositing a material on a target and medical device obstainable therewith.
WO2014189375A1 (en) * 2013-05-21 2014-11-27 Alvimedica Vascular Research B.V. Method for depositing a coating material on a medical device and medical device

Also Published As

Publication number Publication date
CA2034120A1 (en) 1991-07-13

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