EP0107030A2 - Procédé et appareil pour le revêtement électrostatique d'objets avec des fluides - Google Patents

Procédé et appareil pour le revêtement électrostatique d'objets avec des fluides Download PDF

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Publication number
EP0107030A2
EP0107030A2 EP83109256A EP83109256A EP0107030A2 EP 0107030 A2 EP0107030 A2 EP 0107030A2 EP 83109256 A EP83109256 A EP 83109256A EP 83109256 A EP83109256 A EP 83109256A EP 0107030 A2 EP0107030 A2 EP 0107030A2
Authority
EP
European Patent Office
Prior art keywords
bell
displacer
spray
paint
liquid
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP83109256A
Other languages
German (de)
English (en)
Other versions
EP0107030A3 (en
EP0107030B1 (fr
Inventor
Roland-Andreas Meisner
Gerd Rüdiger Dr. Kissau
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.)
BASF Farben und Fasern AG
Original Assignee
BASF Farben und Fasern AG
BASF Lacke und Farben AG
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=25805239&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0107030(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by BASF Farben und Fasern AG, BASF Lacke und Farben AG filed Critical BASF Farben und Fasern AG
Priority to AT83109256T priority Critical patent/ATE31639T1/de
Publication of EP0107030A2 publication Critical patent/EP0107030A2/fr
Publication of EP0107030A3 publication Critical patent/EP0107030A3/de
Application granted granted Critical
Publication of EP0107030B1 publication Critical patent/EP0107030B1/fr
Expired 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
    • B05B5/025—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
    • B05B5/0536—Dimensional characteristics of electrodes, e.g. diameter or radius of curvature of a needle-like corona electrode
    • 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
    • B05B5/04—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces
    • B05B5/0403—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces characterised by the rotating member
    • B05B5/0407—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces characterised by the rotating member with a spraying edge, e.g. like a cup or a bell

Definitions

  • the invention relates to a device for electrostatically coating objects with fluids according to the preamble of the main claim and a method for electrostatically coating objects with fluids according to the preamble of claim 13, claim 14 and claim 15.
  • bell atomizers For application of fluids, e.g. Lacquers, high-speed, so-called bell atomizers are used, which in their inner part act like a turbo machine due to their design, i.e. they suck in gas from the surrounding atmosphere, redirect it and transport it outside again, so that a torus vortex is created inside and in front of the bell cavity.
  • the gas contains particles, e.g. paint particles, which are deposited on the hub plate of the bell atomizer and lead to contamination of this hub plate. Since the separated particles are not or only poorly flowable, burrs rich in solids grow on the hub plate, which after a short time - depending on their size - are thrown off the hub plate, get into the lacquer film guided by the bell atomizer and grow up the object to be coated or painted comes into contact and cause considerable surface defects. This process of soiling the hub plate and the tearing off of these separated burrs takes place very quickly, so that a painting process cannot usually be ended without the above-mentioned surface defects occurring.
  • particles e.g. paint particles
  • the invention is based on the object of achieving a device and a method for applying fluids with rapid evaporation behavior by means of a high-speed rotary bell, the effect of the torus spine and thus the contamination of the hub plate of the high-speed rotary bell being switched off.
  • a method is proposed according to the invention, which is characterized in that an electrical field is generated in front of the bell cavity of the spray bell via a body electrically connected to the spray bell.
  • Another proposal according to the invention provides that a magnetic field is generated in the area of the outside of a body arranged in front of the cavity of the spray bell.
  • Another proposal according to the invention provides that the aforementioned body is designed as an aerodynamic displacement body, which causes a flow around the particles flying back in the torus vertebra.
  • the invention proposes to avoid the impact separation of already largely evaporated paint particles on the high-speed rotary bell by influencing the flight path of the paint particles returning to the high-speed rotary bell in the area of the torus vertebrae by electrical or magnetic or aerodynamic forces or by the combination of the aforementioned forces becomes.
  • each of the three above-mentioned possibilities or the combination of one or more of the above-mentioned possibilities leads to high-rotation bells, with which fluids with fast evaporation behavior, for example basic metallic lacquers, can be applied without problems, without causing any contamination tongues of the hub plate and thus tearing off these separated dirt particles from the hub plate, which would lead to faults in the surface of the object to be coated.
  • the particles flying back in the torus vortex either have a charge of the same polarity as the high-rotation bell or they have an opposite polarity or they are uncharged. All three possibilities can occur in the backflowing particle particle.
  • the body arranged in front of the high-speed rotary bell and on it in a manner fixed against relative rotation is designed such that at a point through which the paint particles, which are preferably deposited, fly back, the local field strength reaches or exceeds the breakthrough field strength in the surrounding gas, so that charges are emitted will. This creates a charge cloud at this point. The returning particles will continue in this load charged or - if the opposite polarity originally existed - reloaded. Incoming uncharged particles are recharged.
  • Influencing of the path lines of the paint particles can, however, also take place according to the invention in that an auxiliary gas flow is applied to the aerodynamic body against the direction of the approaching paint particles, which deflects the torus vortex flow away from the contour.
  • an applied gas flow can be achieved on the entire contour of the aerodynamic body.
  • the resulting drag forces force the particles away from the aerodynamic body.
  • the individual forces or the resulting force from the combinations of these individual forces ensures that paint particles that are approaching do not hit the surface of the body and thus no contamination of the body occurs, and the surface defects in the paint object to be feared up to now can be avoided with certainty.
  • 1 denotes the bell body of a high-speed rotary bell, this bell body 1 consisting of an electrically conductive material, for example aluminum.
  • the hub plate of this bell body 1 is designated 1o.
  • the paint is supplied via a supply line 11 to the back side of the hub plate 1 0th
  • the lacquer film is guided through corresponding through openings 12 in the hub plate to the inside of the rotary bell and is flung off from the outer edge of the rotary bell, as is particularly clearly shown in FIG. 5.
  • An electrode needle 6 (FIG. 6) or an aerodynamically shaped displacer body 3 is fixed on the hub plate 1o via a receiving device 2 and thereby connected in an electrically conductive manner to the high-speed rotary bell.
  • the receiving device 2 for connecting the electrode needle 6 or the displacer 3 with the hub plate 1o must consist of an electrically conductive material.
  • the displacer body 3 can be hollow, the hollow space thus created by intermediate Pieces 4 can be filled out of magnetic material.
  • An electrode needle 6 made of electrically conductive material is arranged at the tip of the displacer body 3 or, as shown in FIG. 2, the displacer body is designed at its tip in such a way that the electrode needle 6 is created by shaping.
  • a magnet 8 as permanent magnet is installed inside the displacer.
  • the displacement body is designed such that an auxiliary gas flow A is applied to the outside of the displacement body 3 with the support of the gas jet, which is directed towards the object to be coated and which leads to a deflection of the torus vortex flow, which is shown at 9 in Fig. 3.
  • the outside of the displacer body 3 has the contour of a ParabeL, while in the embodiment according to FIG. 2, the displacer body 3 has the outside contour of an inverted ParabeL.
  • the aerodynamic current lines have the reference symbol X, the magnetic field lines the reference symbol Y and the electrical field lines the reference symbol Z.
  • the high-rotation bell can be at 9o KVO high DC voltage and the radius of the electrode needle 6 can be 1mm. Then a field strength of 9o KV / mm arises. Since the breakthrough field strength in air is only 3 KV / mm, the high field strength of 9o KV / mm does not arise, but a charge current is generated which leads to counter potential, i.e. For example, a vehicle body to be coated is directed and thereby generates the charge cloud.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
EP83109256A 1982-10-21 1983-09-19 Procédé et appareil pour le revêtement électrostatique d'objets avec des fluides Expired EP0107030B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83109256T ATE31639T1 (de) 1982-10-21 1983-09-19 Vorrichtung und verfahren zum elektrostatischen ueberziehen von gegenstaenden mit fluiden.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3238917 1982-10-21
DE3238917 1982-10-21
DE3241504 1982-11-10
DE19823241504 DE3241504A1 (de) 1982-10-21 1982-11-10 Vorrichtung und verfahren zum elekrtostatischen ueberziehen von gegenstaenden mit fluiden

Publications (3)

Publication Number Publication Date
EP0107030A2 true EP0107030A2 (fr) 1984-05-02
EP0107030A3 EP0107030A3 (en) 1985-09-25
EP0107030B1 EP0107030B1 (fr) 1988-01-07

Family

ID=25805239

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83109256A Expired EP0107030B1 (fr) 1982-10-21 1983-09-19 Procédé et appareil pour le revêtement électrostatique d'objets avec des fluides

Country Status (7)

Country Link
US (1) US4744513A (fr)
EP (1) EP0107030B1 (fr)
AU (1) AU566090B2 (fr)
BR (1) BR8305799A (fr)
CA (1) CA1202215A (fr)
DE (2) DE3241504A1 (fr)
ES (2) ES526686A0 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999049982A1 (fr) * 1998-04-01 1999-10-07 Sames S.A. Bol de pulverisation et projecteur rotatif electrostatique equipe d'un tel bol

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4887770A (en) * 1986-04-18 1989-12-19 Nordson Corporation Electrostatic rotary atomizing liquid spray coating apparatus
US5100057A (en) * 1990-03-30 1992-03-31 Nordson Corporation Rotary atomizer with onboard color changer and fluid pressure regulator
FR2692501B1 (fr) * 1992-06-22 1995-08-04 Sames Sa Dispositif de projection electrostatique de produit de revetement liquide a tete de pulverisation rotative.
US5647543A (en) * 1995-01-31 1997-07-15 Graco Inc Electrostatic ionizing system
EP0734777A3 (fr) * 1995-03-28 1997-08-20 Graco Inc Système d'ionisation électrostatique
US5934574A (en) * 1995-12-05 1999-08-10 Van Der Steur; Gunnar Rotary atomizer
US6322011B1 (en) * 2000-03-14 2001-11-27 Illinois Tool Works Inc. Electrostatic coating system and dual lip bell cup therefor
US6409104B1 (en) 2000-04-19 2002-06-25 Ford Global Technologies, Inc. Silicon-doped amorphous carbon coating for paint bell atomizers
US6578779B2 (en) 2000-10-18 2003-06-17 Behr Systems, Inc. Rotary atomizer with bell element
DE10159588A1 (de) * 2001-12-05 2003-06-12 Duerr Systems Gmbh Glockentellerkonstruktion für Pulverzerstäuber
DE102009010248A1 (de) 2009-02-24 2010-09-02 Dürr Systems GmbH Beschichtungsvorrichtung und Beschichtungsverfahren zur Beschichtung eines Werkstücks
DE102012021218A1 (de) * 2012-10-27 2014-04-30 Volkswagen Aktiengesellschaft Lackiervorrichtung und Verfahren zum Betrieb einer Lackiervorrichtung

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1359208A (fr) * 1963-03-09 1964-04-24 Procédé de réalisation d'un revêtement sur articles divers
US3221992A (en) * 1962-02-08 1965-12-07 Jr John Sedlacsik Coating material motive agent atomizer head
EP0032391A1 (fr) * 1980-01-15 1981-07-22 Behr, Hans Dispositif de pulvérisation de peinture liquide
DE3201753A1 (de) * 1981-03-09 1982-09-16 Champion Spark Plug Co., Toledo, Ohio Verfahren und vorrichtung zum aufbringen von fluessiger farbe auf gegenstaende

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US1832096A (en) * 1925-04-11 1931-11-17 Chaffee Emory Leon Electrical system
GB288904A (en) * 1926-08-31 1928-04-19 Hundertfeuer Ges Fuer Moderne Improvements in liquid spraying devices
US2607574A (en) * 1946-03-15 1952-08-19 Jr John W Hession Aerosol generator
US2896571A (en) * 1955-02-11 1959-07-28 American Can Co Spray head with protective shield
US2926106A (en) * 1956-07-16 1960-02-23 Ransburg Electro Coating Corp Apparatus and methods for electrostatic coating utilizing an inner electrode to substantially reduce the central void of the annular spray pattern
US3055592A (en) * 1956-12-17 1962-09-25 Ransburg Electro Coating Corp Liquid atomizing apparatus
US2967667A (en) * 1957-06-17 1961-01-10 Edward O Norris Electrostatic spray apparatus
US3004714A (en) * 1958-01-14 1961-10-17 Cochrane Corp Heating system
US3131091A (en) * 1960-03-08 1964-04-28 Harry S Jones Spray gun having means to control heat concentration in metal substrate
NL290138A (fr) * 1962-03-14
US4114564A (en) * 1963-06-13 1978-09-19 Ransburg Corporation Electrostatic coating apparatus
US3580509A (en) * 1969-01-06 1971-05-25 John B Goss Control apparatus for high-pressure water system
US3592222A (en) * 1969-12-03 1971-07-13 American Aero Ind Relief valve
US3690067A (en) * 1971-01-25 1972-09-12 American Aero Eng Co Blast cleaning system
US3698635A (en) * 1971-02-22 1972-10-17 Ransburg Electro Coating Corp Spray charging device
FR2158582A5 (fr) * 1971-08-02 1973-06-15 Tunzini Sames
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SU725714A1 (ru) * 1975-01-06 1980-04-05 Научно-Исследовательский Институт Технологии Лакокрасочных Покрытий Научно-Производственного Объединения "Лакокраспокрытие" Центробежный электростатический распылитель
FR2336182A1 (fr) * 1975-12-26 1977-07-22 Marchand Bernard Procede et appareil pour application d'un revetement de peinture liquide sur des objets sous l'effet d'une pulverisation mecanique et d'une precipitation au moyen d'un champ electrique
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3221992A (en) * 1962-02-08 1965-12-07 Jr John Sedlacsik Coating material motive agent atomizer head
FR1359208A (fr) * 1963-03-09 1964-04-24 Procédé de réalisation d'un revêtement sur articles divers
EP0032391A1 (fr) * 1980-01-15 1981-07-22 Behr, Hans Dispositif de pulvérisation de peinture liquide
DE3201753A1 (de) * 1981-03-09 1982-09-16 Champion Spark Plug Co., Toledo, Ohio Verfahren und vorrichtung zum aufbringen von fluessiger farbe auf gegenstaende

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999049982A1 (fr) * 1998-04-01 1999-10-07 Sames S.A. Bol de pulverisation et projecteur rotatif electrostatique equipe d'un tel bol
FR2776946A1 (fr) * 1998-04-01 1999-10-08 Sames Sa Bol de pulverisation et projecteur rotatif electrostatique equipe d'un tel bol
US6347754B1 (en) 1998-04-01 2002-02-19 Sames S.A Atomizing bowl and electrostatic rotary sprayhead unit equipped therewith

Also Published As

Publication number Publication date
DE3241504A1 (de) 1984-04-26
EP0107030A3 (en) 1985-09-25
EP0107030B1 (fr) 1988-01-07
CA1202215A (fr) 1986-03-25
ES535228A0 (es) 1985-05-01
AU566090B2 (en) 1987-10-08
DE3375085D1 (en) 1988-02-11
ES8501642A1 (es) 1984-12-01
US4744513A (en) 1988-05-17
ES8504495A1 (es) 1985-05-01
BR8305799A (pt) 1984-05-29
ES526686A0 (es) 1984-12-01
AU2017883A (en) 1984-05-03

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