EP0120648A2 - Appareil et procédé pour charger par induction un matériau de revêtement conducteur atomisé par la force centrifuge - Google Patents

Appareil et procédé pour charger par induction un matériau de revêtement conducteur atomisé par la force centrifuge Download PDF

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Publication number
EP0120648A2
EP0120648A2 EP84301729A EP84301729A EP0120648A2 EP 0120648 A2 EP0120648 A2 EP 0120648A2 EP 84301729 A EP84301729 A EP 84301729A EP 84301729 A EP84301729 A EP 84301729A EP 0120648 A2 EP0120648 A2 EP 0120648A2
Authority
EP
European Patent Office
Prior art keywords
charge
particles
stream
coating
charged
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Withdrawn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
EP84301729A
Other languages
German (de)
English (en)
Other versions
EP0120648A3 (fr
Inventor
Ion I. Inculet
Richard G. Klein
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.)
Nordson Corp
Original Assignee
Nordson Corp
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
Application filed by Nordson Corp filed Critical Nordson Corp
Publication of EP0120648A2 publication Critical patent/EP0120648A2/fr
Publication of EP0120648A3 publication Critical patent/EP0120648A3/fr
Withdrawn legal-status Critical Current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
    • B05B5/025—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
    • 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
    • B05B5/043—Discharge apparatus, e.g. electrostatic spray guns using induction-charging
    • 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
    • B05B5/0426—Means for supplying shaping gas

Definitions

  • This invention relates to electrostatic coating, and more particularly to electrostatic coating apparatus and methods utilizing rotary atomizers for spraying alectrically conductive coatings.
  • the atomization is accomplished centrifugally as the film of coating material on the inside of the conically- shaped rotating bell is driven radially outwardly from the periphery of the bell by centrifugal force, forming a mist of atomized particles.
  • Electrostatic charging of these atomized particles is accomplished by maintaining the rotary conductive bell at an electrostatic potential sufficiently high to produce a corona discharge at the bell periphery whereat centrifugal atomization occurs.
  • the corona discharge creates ions which collide with the atomized coating particles, charging them with the same polarity as the electrostatic high voltage source to which the conductive atomizing bell is connected.
  • a very serious disadvantage of the prior art rotary conducting atomizing bell is that the bell, which functions as a capacitor of considerable electrical energy storage capability, exhibits an extremely short relaxation time constant because of its con d uc- tive properties.
  • the relaxation time constant (seconds) of an object which stores electrical energy in capacitive form, such as a conductive bell atomizer is proportional to the product of a) the dielectric constant of the material (farads/meter) and b) the resistivity of the material (ohms-meter).
  • a capacitive object such as a conductive atomizing bell
  • a short relaxation time constant will discharge capacitively stored energy at a high rate.
  • an electrostatic spray coating apparatus utilizing a rotary atomizer which does not create safety hazards by discharging electrical energy stored in capacitive form at unduly large rates sufficient to induce shock or ignition.
  • This objective has been accomplished, in accordance with this invention, by providing, in conjunction with a source of conductive coating material, a nonconductive rotating atomizer, preferably a bell, with a charging electrode located proximate the periphery of the bell whereat atomization occurs which induces a charge on the atomized conductive coating particles having a polarity which is opposite to that of the electrostatic source to which the charge-inducing electrode is connected.
  • a very important advantage of the apparatus and method of this invention is that the rotary atomizing bell, since it is fabricated of electrically nonconductive material, exhibits a large relaxation time constant for the discharge of capacitively stored electrical energy. As a consequence, it does not permit discharge of capacitively stored electrical energy at rates sufficient to induce shock or ignition if the rotating nonconductive bell of this invention is inadvertently electrically grounded or contacted by .an operator.
  • a repelling electrode maintained at the same polarity as that of the charged particles is provided rearwardly of the edge of the atomizing bell whereat atomization and charging of the particles occurs.
  • the repelling electrode functions to repel the charged coating particles, thereby inhibiting rearward movement of the coating material and deposit thereof on the atomizer housing.
  • the coating material is pre-charged prior to introduction onto the nonconductive atomizing bell.
  • the charge on the atomized conductive coating particles is substantially increased by an inductive charging electrode which is maintained at a potential less than, but of the same polarity as, the electrostatic source which pre-charged the coating.
  • the charge on the particles induced by the inducing electrode effectively increases the initial charge on the coating material to a level correlated to the difference between the electrostatic potential of the source which initially charged the coating and the electrostatic potential of the source to which the charge-inducing electrode is connected.
  • the magnitude of the electrostatic source to which the charge-inducing electrode is connected is less than that of the electrostatic source which initially charged the conductive coating material, but of the same polarity, the polarity of the pre-charged coating particles remains unchanged after inductive charging, although the charge thereon is substantially increased in magnitude.
  • An important advantage of this embodiment of the invention in addition to the substantial reduction in discharge rate of capacitively stored energy obtained by reason of the use of a nonconductive bell, is that the polarity of the charge on the atomized conductive coating particles is the same as that on the charge-inducing electrode and the repelling electrode, minimizing the deposition of charged coating particles on the repelling and charge-inducing electrodes.
  • the charge-inducing electrode is located within the mouth of the bell and provided with a dome shape. This reduces the deposition of charged conductive coating particles on the charge-inducing electrode which tends to occur as a consequence of a vortex flow pattern created by the spinning bell. That is, the dome-shaped charge-inducing electrode substantially eliminates the vortex flow, thereby minimizing deposition of charged coating material on the charge-inducing electrode.
  • the charge-inducing electrode is mounted for movement with the atomizing bell. As a consequence of rotating the charge-inducing electrode at high speed, any conductive coating material deposited thereon is centrifugally ejected, avoiding accumulation of coating material on the electrode.
  • the spray coating system of this invention in one of the preferred embodiments.thereof shown in Figures 1 and 2, includes a rotary atomizer 10 having as a principal element thereof a rotating cup or bell 12.
  • the rotating cup 12 in a manner well known to those skilled in the art, provides under the action of centrifugal force a stream of atomized coating particles 14 at an emission zone 16 located proximate the periphery 18 of the rotating atomizing cup.
  • conductive charge-inducing electrodes which, in a preferred form, include an internal particle-charging electrode 20 and an external particle-charging electrode 22.
  • the internal and external particle-charging electrodes 20 and 22 induce charges on the atomized particles in the stream 14 at the emission zone 16 which are opposite in polarity to the polarity of the charge-inducing electrodes 20 and 22.
  • the charged particles in stream 14, in a manner well known to those skilled in the art, are electrostatically attracted toward an object 24 to be coated which is maintained, via wire 25 and grounded electrostatic voltage source 27, at a potential sufficiently different from that of the charged particles to electrostatically attract the charged particles for deposition on the object 24.
  • the rotary atomizer 10 considered in greater detail in connection with Figure 1, includes a nonrotating electrically nonconductive housing 26 which may be stationarily mounted for spraying objects 24 moving therepast on a conveyor or the like. Alternatively, the housing 26 may be portable to facilitate manual spray coating of objects 24 which are either stationary or moving.
  • the housing 26 is provided with a longitudinal bore 28 within which is located a shaft 29 rotatable about a horizontal axis 29a in a pair of bearings 30, 31.
  • the shaft 29, like the housing 26, is preferably fabricated of material which is not electrically conductive.
  • a turbine 32 of any suitable construction is mounted to the end surface 26a of the housing 26 and drivingly coupled to the rear end of the shaft 29 (left end as viewed in Figure 1) for rotating the shaft at a desired rate, such as, 30,000 revolutions per minute, sufficient for centrifugal atomization of the coating material by the rotating cup 12.
  • the rotary atomizing element, bell, or cup 12 is mounted for rotation therewith, as is the internal charge- inducer 20.
  • the cup 12 is fabricated of an electrically nonconductive material.
  • the internal inductor 20 has an external shape in the form of a dome.
  • the cup 12 includes a generally frusto-conical, tubular wall section 40 which is separated into forward and rearward' sections 40a and 40b by an integral vertical disc- shaped wall 42 having a circularly arranged array of openings 44.
  • the liquid coating material which must be conductive, such as nonconductive solvent-based paint which has been doped to render it conductive, or water-based paint which is conductive without doping, is injected into the cavity 46 formed by the rearward portion 40b of the wall 40 and the disc 42 and passes forwardly through the openings 44 in wall 42.
  • Coating material entering the forward chamber 50 via openings 44 forms a film F on the interior surface of the forward wall section 40a which advances forwardly and radially outwardly under centrifugal force, ultimately producing a stream of atomized particles 14 at the emission zone 16.
  • the conductive coating material is supplied to the conduit 48 from a suitable pressurized coating supply tank 54.
  • the stream of atomized particles 14 in the region of the emission zone 16 has a generally circular cross-section.
  • the stream of atomized particles 14 can be shaped by a suitably configured stream of air emanating from an appropriately shaped nozzle 60 formed in the forward end 26b of the housing 26.
  • the nozzle 60 can be oval-shaped.
  • a source of pressurized air 62 connects to the nozzle 60 via an air hose 64. The shaping air emanating from the nozzle 60 is directed in the forward direction, and shapes the atomized particle stream 14 when it impinges thereon from the rear.
  • the external charge inducer 22 is fabricated of electrically conductive material.
  • the external charge inducer 22 while susceptive of a variety of configurations, in a preferred form is generally frusto-conical, terminating in a leading edge 22a located slightly to the rear and outwardly of the periphery 18 of the atomizing cup whereat the atomized particles are formed.
  • the internal and external inductors 20 and 22 are charged, preferably positively, from an electrostatic potential source 70, in a manner to be described, for inductively charging the conductive coating particles of the stream 14 in the emission zone 16 with a polarity opposite to that of the polarity of the charge inducers 20 and 22.
  • the charging of the particles of the stream 14 in the emission zone 16, in addition to facilitating attraction thereof toward the object 24 to be coated which is maintained at a different potential by the suitable source 27, also functions to enhance the degree of atomization of the stream 14 since the particles, charged to the same polarity, repel each other.
  • the internal inductor 20 is electrically connected to the source of electrostatic potential 70 by an electrically conductive path which includes a wire 78 located in a suitably provided bore in the forward portion of the shaft 29, the wire 78 being connected at its forward end to the internal inductor 20 and at its rearward end to an electrically conductive ring 80 mounted on the exterior of the shaft 29 forward of the bearing 31. Also included in the conductive path between inductor 20 and source 70 is a conductive brush 82 mounted to the wall of the bore 29 in alignment with the conductive ring 80 which is in wiping contact therewith, and an electrical conductor 84 between the source 70 and the brush 82.
  • the external inductor 22 is connected to wire 78, and in turn to the electrostatic voltage source 70, by an insulated conductive wire 79 molded into the disc 42 and the wall section 40a.
  • the oylindar 86 cooperates with a forwardly extending cylinder 88 formed on the forward surface 26b of the housing 26.
  • the concentric cylinders 86 and 88 function to seal the chamber 46 from the environment.
  • a conductive repelling electrode 90 preferably in the form of a ring, is mounted exterior to the cup section 40a by a plurality of axially disposed nonconductive spokes 92 extending forwardly from the front wall 26b of the housing 26.
  • the repelling ring 90 is electrically connected to a source of electrostatic potential 94 having a polarity which is the same as the polarity of the charged particles in the stream 14, preferably a negative polarity of approximately -20Kv.
  • the connection between the ring 90 and the source 94 is established by conductive wire 98.
  • the repelling ring 90 by reason of being maintained at a polarity opposite to that of the charge on the particles of the stream 14, functions to-minimize a condition known as "sprayback" in which the charged particles in the stream 14 migrate rearwardly and deposit on the housing 26.
  • Figure 3 schematically shows another preferred embodiment of a spray coating system for conductive coatings incorporating the principles of this invention.
  • the system of Figure 3 like the system of Figure 1, includes a rotary atomizer 10 having an atomizing cup 12 driven by a shaft 29 from a turbine 32 which provides a stream of atomized particles 14 at an emission zone 16.
  • the stream of conductive spray coating particles 14 is shaped by a nozzle 60 supplied from a pressurized air source 62 via a line 64.
  • a repelling electrode 90 is mounted exterior to the cup 12 by nonconductive spokes 92 which extend forwardly from housing wall 26b. Repelling electrode 90 functions to inhibit sprayback of coating material from the . stream 14 to the atomizer housing 26.
  • the system of Figure 3 unlike the system of Figure 1, is provided with only a single inductor 20 mounted to the forward end of the shaft 29 for rotation therewith, the function of which will be discussed in more detail hereafter.
  • the spray coating material supplied from pressurized source 54 is either inherently electrically conductive or is injected with a suitable doping agent to render it conductive. As such, it can be maintained at a substantial negative potential, for example, -60Kv, by a suitable high voltage electrostatic source 100 via an electrical conductor 102 which is in electrical contact with the coating material in the tank 54. If the tank 54 is itself fabricated of electrically conductive material, the tank is electrically isolated from ground potential by insulative supports 54a and 54b. Maintenance of the coating in tank 54 at -60Kv potential, produces some negative charging of the conductive coating prior to atomization through the contact charging technique.
  • the charging technique utilized in conjunction with the system depicted in Figure 3 involves, in addition to contact negative charging of the conductive coating material from the source 100, substantial additional negative charging as a result of inductive charging of the atomized particles in stream 14 with the inductor 20 which is connected to a source 106 of negative potential slightly lower in magnitude than the source of negative potential 100.
  • the source 106 charges the inductor 20 to -57Kv via conductor 84, brush 82, ring 80, and wire 78. Since the inductor 20 is maintained at a negative potential of -57Kv, it induces additional negative charge on the atomized particles in the stream 14.
  • the conductive coating material by reason of being maintained at -60Kv, effectively perceives the -57Kv inductor 20 as an inductor at +3Kv.
  • the +3Kv inductor 20 induces opposite polarity charge, that is, negative charge, on the coating. This induced charge is in addition to the negative charge already on the coating by reason of contact charging from the -60Kv source.
  • the negatively charged particle stream 14 is attracted to the object 24, which is maintained by the source 74 at a potential sufficiently different than the charge on the particles to attract the particles and deposit them on the object.
  • the charged particles in the stream 14 having a negative charge With the atomized particles in the stream 14 having a negative charge, the charged particles are repelled by both the repelling ring 90 and the inductor 20, thereby minimizing the tendency of the particles to coat on either the inductor 20 or the repelling ring 90. Additionally, the repelling ring 90, by reason of being located rearwardly of the emission zone 16, minimizes sprayback, that is, deposition of the negatively charged coating particles on the housing 26.
  • the inductor 20 rotates with the cup 16 to centrifugally eject from the inductor 20 any paint particles which are deposited thereon, preventing an accumulation of coating material on the inductor.
  • the spray coating systems of Figures 1, 2 and 3 provide a number of very important advantages. For example, since electrostatic charging of the conductive particles is done inductively, with or without prior contact charging in the event the coating material is pre-charged prior to atomization, a corona discharge found in prior art electrostatic charging systems using conductive atomizing cups maintained at charging potentials, is unnecessary. As a consequence, the atomizing cup can be fabricated of nonconductive material, considerably reducing the discharge rate of energy stored in the system in capacitive form, which in turn very substantially reduces the risk of electrical shock and/or ignition should the atomizing cup be electrically grounded or approach a grounded object.
  • the charging voltage levels required for a given coating transfer efficiency can be much lower than typically required in bell-type electrostatic coating systems of the type in which a conductive bell is used to charge the spray coating particles.
  • the reduction in magnitude of the electrostatic voltage required reduces the cost of the system since the cable which interconnects the high voltage source to the inductive charging electrode of this invention need not be insulated for voltages as high as typically found in prior art rotary atomizers utilizing corona charging.
  • a still further advantage attributable to the fact that the charging inductor is located proximate the forward end of the atomizing cup within the generally circular cross-section stream of atomized particles, is that the repelling electrode located exteriorly and behind the stream can be of relatively simplified shape, such as a ring.
  • a further advantage found in the embodiment of Figures 1 and 2 is that sprayback can be minimized utilizing repelling electrodes connected to relatively low voltage supplies due to the relatively high charge ⁇ on the particles induced by the inductor electrode.
  • FIG. 1 Another advantage of the invention, particularly the embodiment of Figures 1 and 2, is that since inductive particle charging is utilized, very little electrical power is required. For example, there is no electrical power consumed in the induction charging circuit which includes the induction charging electrodes 20 and 22, the high voltage source 70 to which it is connected, the wire 78, ring 80, brush 82, and wire 84.
  • the only electrical current existing in the system of Figures 1 and 2 is the negative charge flow from ground through the path which includes the grounded power supply 27, conductor 25, object 24, charged coating particles in stream 14, coating film F and the coating stream in hose 48, coating in tank 54, and the grounded tank.
  • a further advantage of the invention is that the tendency of the atomized stream of particles 14 to deposit on the inductor 20, as a consequence ' of a vortex flow established by the rotating cup, is very drastically reduced.
  • the stationary repelling ring 90 can be substituted by a plurality of stationary electrically conductive spheres arranged in a circular array about the atomizing cup 12, as best shown in Figure 4.
  • Each of these spheres 110 is mounted to the housing 26 of the atomizer by a nonconductive spoke 92 and is electrically connected, via separate resistors 112, to a common conductor 113 on the atomizer housing which connects to a suitable electrostatic voltage source.

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  • Application Of Or Painting With Fluid Materials (AREA)
  • Electrostatic Spraying Apparatus (AREA)
EP84301729A 1983-03-24 1984-03-14 Appareil et procédé pour charger par induction un matériau de revêtement conducteur atomisé par la force centrifuge Withdrawn EP0120648A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US47859583A 1983-03-24 1983-03-24
US478595 1983-03-24

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EP0120648A2 true EP0120648A2 (fr) 1984-10-03
EP0120648A3 EP0120648A3 (fr) 1985-10-16

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EP84301729A Withdrawn EP0120648A3 (fr) 1983-03-24 1984-03-14 Appareil et procédé pour charger par induction un matériau de revêtement conducteur atomisé par la force centrifuge

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JP (1) JPS59225762A (fr)

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0157872A1 (fr) * 1983-10-03 1985-10-16 Graco Inc Dispositif de pistolage de peinture a atomiseur rotatif.
EP0186342A1 (fr) * 1984-12-24 1986-07-02 General Motors Corporation Méthode et appareil pour pulvériser un matériau de revêtement
EP0186983A1 (fr) * 1984-12-20 1986-07-09 Imperial Chemical Industries Plc Pulvérisateur électrostatique
GB2190606A (en) * 1986-05-19 1987-11-25 Graco Inc Rotary spray atomizer
DE3709508A1 (de) * 1987-03-23 1988-10-06 Behr Industrieanlagen Vorrichtung zum elektrostatischen beschichten von werkstuecken
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
EP0519191A1 (fr) * 1991-05-03 1992-12-23 Ppv-Verwaltungs-Ag Dispositif de pulvérisation de liquides électriquement conducteurs et de poudres très fines
FR2692501A1 (fr) * 1992-06-22 1993-12-24 Sames Sa Dispositif de projection électrostatique de produit de revêtement liquide à tête de pulvérisation rotative.
EP0796663A2 (fr) * 1996-03-22 1997-09-24 Dürr Systems GmbH Pulvérisateur rotatif pour le revêtement assisté par voie électrostatique d'objets par des peintures ou des lacques
EP1134026A3 (fr) * 2000-03-14 2002-12-11 Illinois Tool Works Inc. Système de revêtement électrostatique et bol de pulvérisation à deux arêtes
EP1384515A1 (fr) * 2002-07-22 2004-01-28 Dürr Systems GmbH Compensateur de charge pour un atomiseur rotatif
DE102005015604A1 (de) * 2005-04-05 2006-10-19 Dürr Systems GmbH Rotationszerstäuberbauteil, insbesondere Lenkluftring oder Glockenteller
DE102005044154A1 (de) * 2005-09-15 2007-04-05 Dürr Systems GmbH Rotationszerstäuberbauteil
DE102006057596A1 (de) * 2006-12-06 2008-06-19 Dürr Systems GmbH Lenkluftring mit einer Ringmulde und entsprechender Glockenteller
US8430340B2 (en) 2005-04-05 2013-04-30 Dürr Systems Inc. Rotary atomizer component
RU2483254C1 (ru) * 2011-11-25 2013-05-27 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Московский государственный университет природообустройства" Устройство для увлажнения воздуха
DE102014019309A1 (de) * 2014-12-20 2016-06-23 Eisenmann Se Düsenkopf und Rotationszerstäuber mit einem solchen
CN107638969A (zh) * 2017-11-07 2018-01-30 西安智水环境科技有限公司 一种消霾***喷头专用静电加载装置

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JPH0415310Y2 (fr) * 1986-01-17 1992-04-07
JPH0641647Y2 (ja) * 1989-11-17 1994-11-02 マツダ株式会社 回転霧化塗装装置
JP4568631B2 (ja) * 2005-03-30 2010-10-27 日産自動車株式会社 静電塗装機

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GB1154014A (en) * 1966-08-12 1969-06-04 Mueller Ernst Kg Process for Electrostatically Coating Objects with Paint and means for carrying the process into effect
US3900000A (en) * 1973-11-28 1975-08-19 Thomas J Gallen Apparatus for spray coating articles
FR2370519A1 (fr) * 1976-11-10 1978-06-09 Hajtomuevek Es Festoberendeze Dispositif de peinture par pulverisation electrostatique
US4215818A (en) * 1977-09-20 1980-08-05 National Research Development Corporation Induction charging electrostatic spraying device and method
US4337895A (en) * 1980-03-17 1982-07-06 Thomas Gallen High speed rotary atomizers
GB2093734A (en) * 1981-02-27 1982-09-08 Nat Res Dev Inductively charged spraying apparatus
EP0029302B1 (fr) * 1979-11-19 1984-12-05 Imperial Chemical Industries Plc Procédé et appareil de pulvérisation électrostatique

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Publication number Priority date Publication date Assignee Title
GB1154014A (en) * 1966-08-12 1969-06-04 Mueller Ernst Kg Process for Electrostatically Coating Objects with Paint and means for carrying the process into effect
US3900000A (en) * 1973-11-28 1975-08-19 Thomas J Gallen Apparatus for spray coating articles
FR2370519A1 (fr) * 1976-11-10 1978-06-09 Hajtomuevek Es Festoberendeze Dispositif de peinture par pulverisation electrostatique
US4215818A (en) * 1977-09-20 1980-08-05 National Research Development Corporation Induction charging electrostatic spraying device and method
EP0029302B1 (fr) * 1979-11-19 1984-12-05 Imperial Chemical Industries Plc Procédé et appareil de pulvérisation électrostatique
US4337895A (en) * 1980-03-17 1982-07-06 Thomas Gallen High speed rotary atomizers
GB2093734A (en) * 1981-02-27 1982-09-08 Nat Res Dev Inductively charged spraying apparatus

Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0157872A1 (fr) * 1983-10-03 1985-10-16 Graco Inc Dispositif de pistolage de peinture a atomiseur rotatif.
EP0157872A4 (fr) * 1983-10-03 1986-09-04 Graco Inc Dispositif de pistolage de peinture a atomiseur rotatif.
EP0186983A1 (fr) * 1984-12-20 1986-07-09 Imperial Chemical Industries Plc Pulvérisateur électrostatique
EP0186342A1 (fr) * 1984-12-24 1986-07-02 General Motors Corporation Méthode et appareil pour pulvériser un matériau de revêtement
US4887770A (en) * 1986-04-18 1989-12-19 Nordson Corporation Electrostatic rotary atomizing liquid spray coating apparatus
GB2190606A (en) * 1986-05-19 1987-11-25 Graco Inc Rotary spray atomizer
GB2190606B (en) * 1986-05-19 1990-02-14 Graco Inc A rotary spray atomizer
DE3709508A1 (de) * 1987-03-23 1988-10-06 Behr Industrieanlagen Vorrichtung zum elektrostatischen beschichten von werkstuecken
US5100057A (en) * 1990-03-30 1992-03-31 Nordson Corporation Rotary atomizer with onboard color changer and fluid pressure regulator
EP0519191A1 (fr) * 1991-05-03 1992-12-23 Ppv-Verwaltungs-Ag Dispositif de pulvérisation de liquides électriquement conducteurs et de poudres très fines
FR2692501A1 (fr) * 1992-06-22 1993-12-24 Sames Sa Dispositif de projection électrostatique de produit de revêtement liquide à tête de pulvérisation rotative.
EP0576329A1 (fr) * 1992-06-22 1993-12-29 Sames S.A. Dispositif de projection électrostatique de produit de revêtement liquide à tête de pulvérisation rotative
US5358182A (en) * 1992-06-22 1994-10-25 Sames S.A. Device with rotating atomizer head for electrostatically spraying liquid coating product
DE19611369A1 (de) * 1996-03-22 1997-09-25 Duerr Gmbh & Co Rotationszerstäuber zum elektrostatisch unterstützten Beschichten von Gegenständen mit Farben bzw. Lacken
EP0796663A3 (fr) * 1996-03-22 1998-12-23 Dürr Systems GmbH Pulvérisateur rotatif pour le revêtement assisté par voie électrostatique d'objets par des peintures ou des lacques
EP0796663A2 (fr) * 1996-03-22 1997-09-24 Dürr Systems GmbH Pulvérisateur rotatif pour le revêtement assisté par voie électrostatique d'objets par des peintures ou des lacques
EP1134026A3 (fr) * 2000-03-14 2002-12-11 Illinois Tool Works Inc. Système de revêtement électrostatique et bol de pulvérisation à deux arêtes
US8840050B2 (en) 2002-07-22 2014-09-23 Durr Systems, Inc. Potential neutralization arrangement for an electrostatic rotary atomizer
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Publication number Publication date
JPS59225762A (ja) 1984-12-18
EP0120648A3 (fr) 1985-10-16

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