EP0089043A2 - Method and apparatus for coating objects electronically with fluids - Google Patents

Method and apparatus for coating objects electronically with fluids Download PDF

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Publication number
EP0089043A2
EP0089043A2 EP83102488A EP83102488A EP0089043A2 EP 0089043 A2 EP0089043 A2 EP 0089043A2 EP 83102488 A EP83102488 A EP 83102488A EP 83102488 A EP83102488 A EP 83102488A EP 0089043 A2 EP0089043 A2 EP 0089043A2
Authority
EP
European Patent Office
Prior art keywords
bell
liquid
spray
speed
paint
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Withdrawn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
EP83102488A
Other languages
German (de)
French (fr)
Other versions
EP0089043A3 (en
Inventor
Roland Andreas Dipl.-Ing. Meisner
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
Application filed by BASF Farben und Fasern AG, BASF Lacke und Farben AG filed Critical BASF Farben und Fasern AG
Priority to EP83102488A priority Critical patent/EP0089043A3/en
Publication of EP0089043A2 publication Critical patent/EP0089043A2/en
Publication of EP0089043A3 publication Critical patent/EP0089043A3/en
Withdrawn legal-status Critical Current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
    • B05B3/00—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements
    • B05B3/02—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements
    • B05B3/10—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements discharging over substantially the whole periphery of the rotating member, i.e. the spraying being effected by centrifugal forces
    • B05B3/1064—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements discharging over substantially the whole periphery of the rotating member, i.e. the spraying being effected by centrifugal forces the liquid or other fluent material to be sprayed being axially supplied to the rotating member through a hollow rotating shaft
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B3/00—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements
    • B05B3/02—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements
    • B05B3/10—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements discharging over substantially the whole periphery of the rotating member, i.e. the spraying being effected by centrifugal forces
    • B05B3/1092—Means for supplying shaping gas
    • 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

  • the invention relates to a device for electrostatically coating objects with liquids, e.g. liquid color, according to the preamble of the main claim. Furthermore, the invention relates to a method using the device.
  • liquids e.g. liquid color
  • Spray systems are also known in which the paint is electrostatically drawn off as a thin film from a knife-like edge.
  • the paint is fed to the spray edge by gravity or centrifugal force.
  • the invention has for its object to provide a device with which a liquid, e.g. liquid paint, can be sprayed onto an object to be processed, whereby, in contrast to the previously known devices, difficult coating materials, such as "MetaLLic lacquers", can be processed and a uniform fine distribution of the color is ensured without fear must have air pockets.
  • a liquid e.g. liquid paint
  • difficult coating materials such as "MetaLLic lacquers”
  • the invention further proposes a method that can be carried out using the device and is defined in the characterizing part of claim 5.
  • a device consists in a bell, which is seated on a hollow axis and is driven by an external rotor drive.
  • the hollow axis itself serves as a lacquer channel, which widens like a diffuser at the transition point to the inside of the bell, before the fluid then passes through a rectifier sieve at its end.
  • the liquid is then transferred radially and rotationally symmetrically to the moving inner surface of the bell, which is grooved for positive transport. This radial toothing contributes to the transmission of the Coriolis force.
  • nozzle holes are made on one or more sub-circles, one of which is preferably larger than the diameter of the atomizing edge.
  • the pitch circle diameter and the bore geometry are selected in relation to the air flow rate so that the air balance around the rotating bell is ensured and the sprayed paint mist cone receives a defined axial thrust through the circular air curtain.
  • the fluid stream supplied centrally to the bell which rotates at a speed of preferably 15,000 to 60,000 rpm, is fed through the torus vortex formed in the free half space without detaching the moving bell inner surface and there, in a manner known per se, via frictional engagement or positive engagement of the spray edge is fed.
  • the fluid flow is almost decelerated to zero speed by means of a diffuser and a rectifier sieve.
  • the position of the swirl axis is not subject to any restrictions in wide operating areas.
  • FIG. 1 has the hollow shaft 1, which supports the bearings 10 and 10 'of the bell 2 with the rotor 5, the stator 11 and the dynamic seal 20 and the fabric bushing 16.
  • the electrical supply line 8 for the stator is guided in a groove 17 on the hollow shaft through the bearing 10 '.
  • the hollow shaft ends in a diffuser 12, which is closed by a rectifying sieve 14.
  • the inlet of the diffuser is designed as a valve seat 3, on which the fluid flow can be shut off using the valve needle 4.
  • the bell inner contour carries a radial toothing 15 for the transmission of the Coriolis force.
  • the additional nozzle bores 9 of the nozzle ring 6 produce an annular air curtain which imparts an axial thrust to the paint mist sprayed on the edge 13.
  • the paint to be sprayed is introduced via line 7.
  • a pneumatic drive with a turbine rotor 18 and nozzle ring 19 is provided instead of the electric drive.

Abstract

A simple, compact and operationally reliable device is proposed with which a fluid, for example liquid paint, can be sprayed onto an object to be processed, the conveying speed of the fluid fed to the centre of the spraying bell being decelerated to virtually zero on entry into the bell, the speed then being increased by accelerating the fluid through the bell to 15,000 to 60,000 RPM and subsequently spinning it off from the spraying edge of the bell and supplying it to the object to be coated. <IMAGE>

Description

Die Erfindung bezieht sich auf eine Vorrichtung zum elektrostatischen überziehen von Gegenständen mit FLüssigkeiten, z.B. flüssiger Farbe, gemäß dem Oberbegriff des Hauptanspruches. Weiterhin bezieht sich die Erfindung auf ein Verfahren unter Benutzung der Vorrichtung.The invention relates to a device for electrostatically coating objects with liquids, e.g. liquid color, according to the preamble of the main claim. Furthermore, the invention relates to a method using the device.

Verfahren und Vorrichtungen zum elektrostatischen überziehen von Gegenständen mit Farbe sind in großer Zahl bekannt. So gibt es Sprühpistolen in den verschiedensten Ausführungen, bei denen das Farbgut mittels Druckluft oder Airless versprüht wird. An der Versprühungsstelle liegt eine nadelförmige Hochspannungselektrode, über die infolge der hohen Feldlinienkonzentration eine elektrische Aufladung des Spritznebels erfolgt.Methods and devices for electrostatically coating objects with paint are known in large numbers. There are spray guns in a wide variety of designs in which the paint is sprayed using compressed air or airless. At the spraying point there is a needle-shaped high-voltage electrode, via which the spray mist is electrically charged due to the high field line concentration.

Weiter sind Sprühsysteme bekannt, bei denen das Farbgut als dünner Film von einer messerartig ausgebildeten Kante elektrostatisch abgezogen wird. Dabei erfolgt die Zuführung des Farbgutes zur Sprühkante durch Schwerkraft oder Fliehkräfte.Spray systems are also known in which the paint is electrostatically drawn off as a thin film from a knife-like edge. The paint is fed to the spray edge by gravity or centrifugal force.

SchLießLich ist es bekannt, daß durch hohe Zentrifugalkräfte, mit oder ohne elektrischem Feld, eine Zerstäubung erzielbar ist, die im wesentlichen die VorteiLe der vorher genannten Verfahren beinhaltet. Dieses System hat jedoch den NachteiL, daß infolge der Sprühglockenkonstruktion, selbst bei zentraler Lackzuführung, das Farbgut vor dem Zerstäuben UnstetigkeitssteLLen passieren muß (unstetige Querschnittsveränderung, Coriolisbeschleunigungssprung) die Veränderungen im Farbgut (z. B. durch Einschlagen von Luft) nach sich ziehen. Weiter benötigen diese Systeme eine zentrale Zerstäubernabe, um das Farbgut der Sprühkante zuzuführen. Diese Zerstäubernabe unterliegt unkontrollierbarer Verschmutzung.Finally, it is known that atomization can be achieved by high centrifugal forces, with or without an electric field, which essentially contains the advantages of the aforementioned methods. However, this system has the disadvantage that, due to the construction of the spray bell, even with a central paint supply, the colored material has to pass discontinuities before atomization (discontinuous change in cross-section, Coriolis acceleration jump), which leads to changes in the colored material (e.g. due to air blowing in). These systems also require a central atomizer hub to feed the paint to the spray edge. This atomizer hub is subject to uncontrollable contamination.

Der Erfindung Liegt die Aufgabe zugrunde, eine Vorrichtung zu schaffen, mit der eine FLüssigkeit, z.B. flüssige Farbe, auf einen zu bearbeitenden Gegenstand aufgesprüht werden kann, wobei im Unterschied zu den bisher bekannten Einrichtungen auch schwierige überzugs-Materialien, wie beispielsweise "MetaLLic-Lacke", verarbeitet werden können und eine gleichmäßige Feinverteilung der Farbe gewährleistet ist, ohne daß befürchtet werden muß, daß LufteinschLüsse vorhanden sind. Der Wirkungsgrad soll wesentlich erhöht werden und eine einfache, handliche und betriebssichere Vorrichtung geschaffen werden.The invention has for its object to provide a device with which a liquid, e.g. liquid paint, can be sprayed onto an object to be processed, whereby, in contrast to the previously known devices, difficult coating materials, such as "MetaLLic lacquers", can be processed and a uniform fine distribution of the color is ensured without fear must have air pockets. The efficiency should be increased significantly and a simple, handy and reliable device should be created.

Diese der Erfindung zugrundeliegende Aufgabe wird durch die Merkmale des kennzeichnenden TeiLs des Hauptanspruches gelöst.This object on which the invention is based is achieved by the features of the characterizing part of the main claim.

Die Erfindung schlägt weiterhin ein Verfahren vor, daß unter Benutzung der Vorrichtung durchgeführt werden kann und im kennzeichnenden Teil des Anspruches 5 definiert ist.The invention further proposes a method that can be carried out using the device and is defined in the characterizing part of claim 5.

Eine Vorrichtung gemäß der Erfindung besteht in einer auf einer Hohlachse sitzenden Glocke, die durch einen Außenläuferantrieb angetrieben wird. Die Hohlachse selbst dient dabei als Lackkanal, der sich an der Übergangsstelle zur Glockeninnenseite diffusorartig erweitert, bevor das Fluid dann an dessen Ende ein Gleichrichtersieb passiert. RadiaL und rotationssymmetrisch wird dann die Flüssigkeit der bewegten, zum formschlüssigen Transport gerillten Glockeninnenfläche übergeben. Diese RadiaLverzahnung trägt zur übertragung der Corioliskraft bei. Nach rückwärts versetzt sind Düsenbohrungen auf einem oder mehreren TeiLkreisen angebracht, von denen einer vorzugsweise größer ist als der Durchmesser der Zerstäubungskante. Der TeiLkreisdurchmesser und die Bohrungsgeometrie werden in Relation zum Luftdurchsatz so gewählt, daß einmal der Lufthaushalt um die rotierende GLocke sichergestellt wird und zum zweiten der abgesprühte Lacknebelkegel durch den kreisringförmigen Luftschleier einen definierten Axialschub erhält.A device according to the invention consists in a bell, which is seated on a hollow axis and is driven by an external rotor drive. The hollow axis itself serves as a lacquer channel, which widens like a diffuser at the transition point to the inside of the bell, before the fluid then passes through a rectifier sieve at its end. The liquid is then transferred radially and rotationally symmetrically to the moving inner surface of the bell, which is grooved for positive transport. This radial toothing contributes to the transmission of the Coriolis force. Set backwards, nozzle holes are made on one or more sub-circles, one of which is preferably larger than the diameter of the atomizing edge. The pitch circle diameter and the bore geometry are selected in relation to the air flow rate so that the air balance around the rotating bell is ensured and the sprayed paint mist cone receives a defined axial thrust through the circular air curtain.

Bei der erfindungsgemäßen Arbeitsweise wird also der der mit einer Drehzahl von vorzugsweise 15.000 bis 60.000 UPM rotierenden Glocke zentral zugeführte FLuidstrom durch den sich im freien Halbraum ausbildenden ToruswirbeL ohne Ablösung der bewegten Glockeninnenfläche zugeführt und dort in an sich bekannter Weise über Reibschluß bzw. Formschluß der Sprühkante zugeführt wird. Hierbei wird der Fluidstrom mittels eines Diffusors und eines Gleichrichtersiebes nahezu auf die Geschwindigkeit Null abgebremst. Die Lage der Drallachse unterliegt dabei in weiten Betriebsbereichen keinen Einschränkungen.In the mode of operation according to the invention, the fluid stream supplied centrally to the bell, which rotates at a speed of preferably 15,000 to 60,000 rpm, is fed through the torus vortex formed in the free half space without detaching the moving bell inner surface and there, in a manner known per se, via frictional engagement or positive engagement of the spray edge is fed. Here, the fluid flow is almost decelerated to zero speed by means of a diffuser and a rectifier sieve. The position of the swirl axis is not subject to any restrictions in wide operating areas.

Ein Ausführungsbeispiel der Vorrichtung wird nachfolgend anhand der Zeichnung erläutert. Die Zeichnung zeigt dabei in

  • Fig. 1 einen Schnitt durch eine erste Ausführungsform mit elektrischem Antrieb und in
  • Fig. 2 einen Schnitt durch eine abgeänderte Ausführungsform mit pneumatischem Antrieb.
An embodiment of the device is explained below with reference to the drawing. The drawing nation shows in
  • Fig. 1 shows a section through a first embodiment with an electric drive and in
  • Fig. 2 shows a section through a modified embodiment with a pneumatic drive.

Die Ausführungsform der Fig. 1 weist die Hohlwelle 1 auf, welche die Lagerungen 10 und 10' der Glocke 2 mit dem Rotor 5, dem Stator 11 sowie die dynamische Dichtung 20 und die Stoffbuchse 16 trägt. Die elektrische ZuLeitung 8 für den Stator wird in einer Nut 17 auf der Hohlwelle durch das Lager 10' geführt. Die HohLweLLe endet in einem Diffusor 12, der durch ein Gleichrichtsieb 14 abgeschlossen ist. Der Einlauf des Diffusors ist als Ventilsitz 3 ausgebildet, an dem der Fluidstrom mit Hilfe der Ventilnadel 4 abgesperrt werden kann. Die Glockeninnenkontur trägt zur übertragung der Corioliskraft eine Radialverzahnung 15. Die zusätzlichen Düsenbohrungen 9 des Düsenkranzes 6 erzeugen einen kreisringförmigen Luftschleier, der dem an der Kante 13 versprühten Lacknebel einen Axialschub aufprägt. Die Einführung des zu versprühenden Lackes erfolgt über die Leitung 7.The embodiment of FIG. 1 has the hollow shaft 1, which supports the bearings 10 and 10 'of the bell 2 with the rotor 5, the stator 11 and the dynamic seal 20 and the fabric bushing 16. The electrical supply line 8 for the stator is guided in a groove 17 on the hollow shaft through the bearing 10 '. The hollow shaft ends in a diffuser 12, which is closed by a rectifying sieve 14. The inlet of the diffuser is designed as a valve seat 3, on which the fluid flow can be shut off using the valve needle 4. The bell inner contour carries a radial toothing 15 for the transmission of the Coriolis force. The additional nozzle bores 9 of the nozzle ring 6 produce an annular air curtain which imparts an axial thrust to the paint mist sprayed on the edge 13. The paint to be sprayed is introduced via line 7.

Bei der in Fig. 2 dargestellten Ausführungsform ist anstelle des elektrischen Antriebes ein pneumatischer Antrieb mit Turbinenrotor 18 und Düsenring 19 vorgesehen.In the embodiment shown in FIG. 2, a pneumatic drive with a turbine rotor 18 and nozzle ring 19 is provided instead of the electric drive.

Claims (5)

1. Vorrichtung zum elektrostatischen überziehen von Gegenständen mit Flüssigkeiten, insbesondere flüssiger Farbe, mit einer um eine feststehende Achse rotierenden Hochrotationsglocke, in die zentrisch die Flüssigkeit eingebracht wird und die von einer Anzahl von Druckluftdüsen umgeben sowie mit einem Hochspannungsgenerator verbunden ist, dadurch gekennzeichnet, daß die Innenseite der Sprühglocke (2) mit einer Radialverzahnung (15) versehen ist, so daß die Energieübertragung von der Sprühglocke (2) auf die Flüssigkeit formschlüssig erfolgt.1.Device for the electrostatic coating of objects with liquids, in particular liquid paint, with a high-rotation bell rotating about a fixed axis, into which the liquid is introduced centrally and which is surrounded by a number of compressed air nozzles and connected to a high-voltage generator, characterized in that the inside of the spray bell (2) is provided with radial teeth (15) so that the energy transfer from the spray bell (2) to the liquid takes place in a positive manner. 2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß in der ZuführLeitung (7) für die Flüssigkeit im Bereich des zerstäubernabenlosen Endes ein Diffusor (12) vorgesehen ist.2. Device according to claim 1, characterized in that a diffuser (12) is provided in the feed line (7) for the liquid in the region of the end without a hub. 3. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß im Strömungsweg der Flüssigkeit in Strömungsrichtung gesehen auf den Diffusor (12) ein Gleichrichtsieb (14) folgt.3. Apparatus according to claim 2, characterized in that in the flow path of the liquid seen in the flow direction on the diffuser (12) follows a rectifying sieve (14). 4. Vorrichtung zumindest nach Anspruch 1, gekennzeichnet durch einen im rückwärtigen Bereich der Sprühglocke (2) zusätzlich angeordneten Düsenkranz (6) zur Erzeugung eines ringförmigen Luftmantels.4. The device at least according to claim 1, characterized by a nozzle ring (6) additionally arranged in the rear region of the spray bell (2) for producing an annular air jacket. 5. Verfahren zum elektrostatischen überziehen von Gegenständen mit FLüssigkeiten, insbesondere flüssiger Farbe, unter Verwendung der Vorrichtung nach Anspruch 1 bis 4 durch Zuführen der Flüssigkeit zu einer unter Hochspannung stehenden, mit hoher Drehzahl umlaufenden Sprühglocke und Abschleudern der Flüssigkeit von der Sprühkante der Glocke auf den zu beschichtenden Gegenstand unter Zuhilfenahme eines ringförmigen Luftmantels, dadurch gekennzeichnet, daß die Fördergeschwindigkeit der der Sprühglocke zugeführten, dem sich bildenden Toruswirbel ausgesetzen FLüssigkeit in axialer Richtung vor übergabe an die Glocke nahezu Null ist, dann die Fördergeschwindigkeit der an die Glocke übergebenen FLüssigkeit durch die Umlaufgeschwindigkeit der Glocke von 15.000 bis 60.000 UPM erhöht wird.5. A method for electrostatically coating objects with liquids, in particular liquid paint, using the device according to claims 1 to 4 by supplying the liquid to a high voltage the, rotating at high speed spray bell and throwing the liquid from the spray edge of the bell onto the object to be coated with the aid of an annular air jacket, characterized in that the conveying speed of the liquid supplied to the spray bell, exposed to the toroidal vortex which forms, is transferred in the axial direction before transfer the bell is almost zero, then the conveying speed of the liquid transferred to the bell is increased by the circulating speed of the bell from 15,000 to 60,000 rpm.
EP83102488A 1981-01-28 1981-01-28 Method and apparatus for coating objects electronically with fluids Withdrawn EP0089043A3 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP83102488A EP0089043A3 (en) 1981-01-28 1981-01-28 Method and apparatus for coating objects electronically with fluids

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP83102488A EP0089043A3 (en) 1981-01-28 1981-01-28 Method and apparatus for coating objects electronically with fluids

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP81100609A Division EP0034278B1 (en) 1980-02-15 1981-01-28 Method and apparatus for the electrostatic coating of articles by means of a fluid
EP81100609.7 Division 1981-01-28

Publications (2)

Publication Number Publication Date
EP0089043A2 true EP0089043A2 (en) 1983-09-21
EP0089043A3 EP0089043A3 (en) 1984-01-11

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EP83102488A Withdrawn EP0089043A3 (en) 1981-01-28 1981-01-28 Method and apparatus for coating objects electronically with fluids

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2282084A (en) * 1993-09-23 1995-03-29 Remtox Chemicals Limited Liquid Injector

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2850322A (en) * 1956-05-31 1958-09-02 Rheem Mfg Co Centrifugal spray head
US2893894A (en) * 1958-11-03 1959-07-07 Ransburg Electro Coating Corp Method and apparatus for electrostatically coating
DE1148167B (en) * 1954-05-24 1963-05-02 Harper J Ransburg Co Rotary atomizer for the electrostatic application of paint or similar fluids
DE1933147A1 (en) * 1969-06-30 1971-01-21 Mueller Ernst Kg Paint spray gun for electrostatic paint spraying

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1148167B (en) * 1954-05-24 1963-05-02 Harper J Ransburg Co Rotary atomizer for the electrostatic application of paint or similar fluids
US2850322A (en) * 1956-05-31 1958-09-02 Rheem Mfg Co Centrifugal spray head
US2893894A (en) * 1958-11-03 1959-07-07 Ransburg Electro Coating Corp Method and apparatus for electrostatically coating
DE1933147A1 (en) * 1969-06-30 1971-01-21 Mueller Ernst Kg Paint spray gun for electrostatic paint spraying

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2282084A (en) * 1993-09-23 1995-03-29 Remtox Chemicals Limited Liquid Injector

Also Published As

Publication number Publication date
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