EP1641568B1 - Procede de revetement d'objets, systeme d'electrode et dispositif de revetement - Google Patents

Procede de revetement d'objets, systeme d'electrode et dispositif de revetement Download PDF

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Publication number
EP1641568B1
EP1641568B1 EP04738048A EP04738048A EP1641568B1 EP 1641568 B1 EP1641568 B1 EP 1641568B1 EP 04738048 A EP04738048 A EP 04738048A EP 04738048 A EP04738048 A EP 04738048A EP 1641568 B1 EP1641568 B1 EP 1641568B1
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EP
European Patent Office
Prior art keywords
electrode
coating
arrangement
air flow
articles
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.)
Expired - Lifetime
Application number
EP04738048A
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German (de)
English (en)
Other versions
EP1641568A1 (fr
Inventor
Peter Taiana
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.)
Soudronic AG
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Soudronic AG
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/14—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas designed for spraying particulate materials
    • B05B7/1481—Spray pistols or apparatus for discharging particulate material
    • B05B7/1486—Spray pistols or apparatus for discharging particulate material for spraying particulate material in dry state

Definitions

  • the invention relates to a method for electrostatically assisted coating of articles with a coating material. Furthermore, the invention relates to an electrode assembly for generating an electric field in electrostatically assisted coating equipment and an electrostatic coating system.
  • the electrostatic influence of coating material in the coating of objects is well known and aims at the best possible deposition of the coating particles on the object.
  • Application finds this type of coating in many areas, especially when coating the weld on the inside of can bodies with a powdery coating material, such as from DE-A-42 27455 known.
  • It is also known to protect the field-generating electrode by a ring against the direct impingement of the powder / air mixture and also to flush the electrode with an air flow in order to minimize the contamination of the electrode by powder particles.
  • a more or less adherent accumulation of powder on the electrode may still occur, with polyamide coating powder in particular being problematic in this respect and prone to sintering at the electrode.
  • a soiled electrode changes the operating conditions during the coating and possibly causes a breakdown in the operation of the coating system.
  • the invention has for its object to provide an improved electrostatically assisted coating process.
  • Moving objects are preferably coated in this way, since as a rule the objects are moved past the coating site once at high speed, as a result of which a reduced coating due to contamination of the electrode can no longer be corrected. In particular, this is the case when coating the weld seam area inside can bodies, which is the preferred application of the method.
  • An oscillatable design of the electrode is preferred so that it can be set into oscillation or vibrated by an excitation means.
  • the excitation means may e.g. act electromagnetically or piezoelectrically.
  • an embodiment of the electrode is preferred such that it can be set in vibration by an air flow, similar to the blown tongue of a musical wind instrument.
  • it is known to provide a scavenging air flow to the electrode, and it is preferable to use just scavenging air as the drive for generating vibration.
  • the stationary electrode arrangement and objects moved past it to make the electrode driven, for example as a rotating electrode.
  • the electrode contamination reduce or avoid by coating material.
  • the electrode movement eg rotation, can be effected by an electric motor but also pneumatically and, for example, again by the mentioned scavenging air.
  • the advantages of preferred embodiments explained with reference to the method also apply to the preferred embodiments of the electrode arrangement or the coating apparatus.
  • the vibration excitation by an air flow results in a particularly simple construction in coating systems, and especially can coating systems, which are already designed to provide an air flow (scavenge air flow). This allows a simple retrofitting of such electrode arrangements in already existing coating devices.
  • a moving electrode e.g. a rotating electrode
  • a moving electrode e.g. a rotating electrode
  • FIG. 1 shows schematically the conditions when coating can weld seams on the inside of cans as an example of objects to be coated.
  • a powdery coating material is usually used, for example a polyamide powder.
  • Such coating materials are known and are not explained here in detail.
  • liquid coating materials in drop form, wherein the present invention may also find application. Also, such materials are known and will not be explained here.
  • a can body 3 is indicated, which is located above the arm 2 of a coating device 1. The can is transported by a not shown, known transport device at high speed in the direction of arrow A.
  • the can body 3 has previously been welded in a likewise known manner between the welding rollers 11 and 12 of a not-shown can welding machine, wherein usually a Draht thoroughlyelektrode on the welding rollers 11 and 12 is used.
  • the lower welding roller 11 is rotatably mounted on the lower arm 10 of the welding machine. Passing through this lower arm 10 and thereafter into the arm 2 of the coating device, at least one line 13 for conveying a coating powder-air mixture is provided.
  • the coating powder is thereby passed through conveying air through the welding machine in a known manner conveyed along the line 13 to the coating device 1.
  • the powder-air mixture is shown in the line 13 with arrows 15 and at the exit point 4 of the coating device 1 as a cloud 15.
  • the coating powder passes at the outlet at the exit point 4 on the inside of the can body 3 on the uncoated weld and forms there a layer which subsequently baked in a known manner and cooled above the weld forms a dense coating, which completes the inner coating of the can body in the weld seam area.
  • This is known and need not be explained here. It is known, as in FIG. 1 shown to provide a tip electrode 7, which is supplied via a voltage source 8 with high voltage. The correspondingly forming electrostatic field leads in a known manner to an influence of the coating material and its better adhesion to the can body 3.
  • FIGS. 2 and 3 Now show an embodiment of an electrode assembly 6 according to the invention and to explain the inventive method.
  • This electrode arrangement 6 can be used directly instead of the electrode arrangement 6 'shown in FIG.
  • the same reference numerals show the same elements, in particular again the scavenging air line is denoted by 14 and the scavenging air with the arrows 17.
  • the arrow 15 above the electrode assembly 6 shows the course of the air-powder mixture 15 accordingly FIG. 1
  • the electrode assembly 6 is usually in the device 1 of FIG. 1 arranged so that there is a similar, substantially constant from the object surface to be coated spaced position of the electrode 9 of the inventive electrode assembly 6, as corresponds to the electrode 7 according to the prior art.
  • a high voltage source 8 which preferably also generates DC voltage in the range of 20 kV.
  • the electrode 9 is designed as a vibrating or oscillating electrode.
  • the electrode is designed as a spring tongue-like, one end fixed electrode and the other end exposed electrode, which is preferably arranged in front of the opening 25 'of a resonance chamber 25.
  • FIG. 2 shows a vertical section through the electrode assembly 6 with the electrode 9 and
  • FIG. 3 shows a frontal view in the direction of arrow B of FIG. 2 , It can be seen that the vibratable electrode 9 is arranged with a fastening means 20 in front of the opening 25 'of the resonance chamber 25 and in its outer shape substantially corresponds to this opening, so that only a narrow gap 19 between the opening 25' and the electrode. 9 formed.
  • the width of this gap is for example only 1/10 mm. Smaller gap sizes are usually to be avoided for conventional coating powder for cans, since otherwise powder particles in the gap 19 can clamp. A slightly larger width of the gap 19 can be selected, but this must be such that a swinging of the tongue-shaped electrode 9 results due to the purge air 17.
  • the purge air exits through the gap and thereby stimulates the electrode 9 to the vibration or vibration desired according to the invention. In this preferred embodiment, therefore, the oscillation of the electrode is generated by an air flow, which preferably consists of the purge air flow 17.
  • other means of vibrational excitation of the electrode may be used, such as piezoelectric or electromagnetic vibrational excitation.
  • an oscillation frequency of about 500 Hz at an amplitude at the free end of the electrode 9 of about 0.5 mm can be given.
  • the oscillation frequency and the amplitude can be freely selected within a fairly wide range.
  • the above-mentioned oscillation frequency is set at the conventional air amount of 1 to 2 liters / minute, when for the electrode assembly 6 of FIG. 2 about the following mass be chosen.
  • the vibration excitation and the maintenance of the vibration is better when the resonance chamber 25 such a space 24 is connected upstream, instead of the direct insertion of the line 14 in the resonance chamber 25.
  • the resonance chamber 25 itself has a height v of about 10 mm and a width u of about 5 mm has proven suitable if the height h of the free tongue part of the electrode 9 is about 6-7 mm and the width b of the electrode is about 2 mm and the thickness is about 0 , 05 mm.
  • the electrode is formed from a spring steel and preferably has the in FIG. 3 shown tongue-like shape. But it is also possible to provide an eg rectangular shaped electrode 9 ', as in FIG. 3 indicated by broken lines.
  • the housing of the electrode assembly 6 is preferably made of plastic.
  • the voltage source 8 applied to the electrode 9 is the same voltage source as used in the conventional tip electrode.
  • other coating applications may take a different shaped and other dimensions design Electrode be used.
  • the dimensions of the electrode assembly 6 are variable in a wide range and a resonance chamber is usually only required if the vibration excitation is carried out by an air flow. If another possibility of vibrational excitation is used, for example a piezoelectric or an electromagnetic vibrational excitation, by means of which the oscillatable electrode is forcibly vibrated directly, then of course the air supply and the spaces 24 and 25 are not needed.
  • vibration excitation by a beating element which causes the electrode 9 only temporarily by a blow to the electrode or possibly an adjacent housing part or support member in vibration, can also be used to avoid the deposition of coating material and satisfy.
  • the excitation for oscillation of the electrode can be done periodically or at random intervals.
  • FIG. 4 schematically shows a further embodiment in which a per se conventional tip electrode is provided within the electrode assembly 6.
  • This tip electrode 29, which is again connected to the voltage source 8, is mounted on a base 30, which forms the actual vibrating element.
  • the electrode 29 is rigid and follows only the movement of the vibrating base.
  • This pedestal may in turn be driven piezoelectrically, electromagnetically or electromotively, or in some other known way to effect vibration. These vibrations can be done in the direction of arrow C and / or arrow D.
  • a cylindrical and rigid tip electrode in its lower region can be vibrated, for example in a range from 100 Hz to also 500 Hz or higher. Also in this way, the deposition of coating material by vibration of the electrode can be prevented.
  • scavenging air 17 can be used in a known manner, so that the scavenging air the rinse serves and is not used for vibration generation.
  • the electrode is not vibrated, but moved in another way, preferably rotated about an axis E.
  • the electrode arrangement 6 two electrodes 39 are arranged on a support 38, which together with the shaft 37 is rotatable about the said axis of rotation E.
  • the electrodes are in turn connected to the voltage source U.
  • the rotation can take place, for example, by an electric motor, or in turn an air flow, for example the scavenging air flow 17, could be used to drive the electrodes 39, which is possible by means of a corresponding wind-wheel-shaped design of the carrier 38.
  • the electrode assembly 6 is stationary with respect to the again moving objects 3 and only the single electrode or the individual electrodes 39 are moved.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Claims (17)

  1. Procédé pour le revêtement électrostatiquement assisté d'objets (3) avec un matériau de revêtement (15),
    caractérisé en ce que
    au moins une électrode (9; 29) génératrice d'un champ est mise en vibration pendant l'opération de revêtement, de façon au moins temporaire, de préférence de façon continue.
  2. Procédé selon la revendication 1,
    caractérisé en ce que
    les objets (3) sont déplacés en passant devant l'électrode stationnaire vibrante (9; 29), et sont notamment des corps de boîtes dont la zone de joint intérieure est soumise à un revêtement, en particulier avec un matériau de revêtement poudreux.
  3. Procédé selon la revendication 1 ou 2,
    caractérisé en ce que
    l'électrode est configurée comme un élément oscillateur (9) et est excitée pour entrer en vibration par un moyen excitateur (17).
  4. Procédé selon la revendication 3,
    caractérisé en ce que
    l'électrode est excitée pour entrer en vibration par un jet d'air (17), en particulier par un jet d'air de balayage.
  5. Procédé selon la revendication 4,
    caractérisé en ce que
    l'électrode (9) est disposée en forme de lamelle, et notamment en forme de languette, devant l'ouverture (25') d'une chambre de résonance (25), et que l'air (17) est amené à travers un interstice (19) entre l'électrode (9) et l'ouverture (25').
  6. Procédé selon la revendication 1 ou 2,
    caractérisé en ce que
    l'électrode (29) est réalisée sous forme d'un élément essentiellement rigide, qui est entraîné en oscillation par un moyen d'entraînement (30).
  7. Procédé selon la revendication 6,
    caractérisé en ce que
    l'électrode (29) est exposée à un jet d'air de balayage s'écoulant autour.
  8. Procédé pour le revêtement électrostatiquement assisté d'objets en mouvement (3), avec un matériau de revêtement (15), au moyen d'un agencement d'électrode (6) stationnaire, espacé des objets, comprenant au moins une électrode (39),
    caractérisé en ce que
    l'électrode (39) est entraînée en mouvement au moins temporairement pendant le revêtement, en particulier entraînée en mouvement rotatoire autour d'un axe de rotation (E).
  9. Procédé selon la revendication 8,
    caractérisé en ce que
    l'électrode (39) est entraînée en mouvement par un jet d'air (17) ou par un moteur électrique.
  10. Agencement d'électrode (6) permettant de créer un champ électrique dans le cadre de dispositifs de revêtement pour le revêtement électrostatiquement assisté,
    caractérisé en ce que
    l'agencement (6) comprend au moins une électrode (9; 29) apte à être entraînée en vibration.
  11. Agencement d'électrode selon la revendication 10, caractérisé en ce que l'électrode (9) est réalisée sous forme d'une électrode flexible (9) apte à être excitée pour entrer en oscillation, en particulier sous forme d'une électrode (9) apte à être excitée par un jet d'air pour entrer en oscillation.
  12. Agencement d'électrode selon la revendication 11,
    caractérisé en ce que
    l'électrode (9) est configurée, pour l'essentiel, sous forme d'une lamelle, en particulier sous forme d'une languette, et est d'un seul côté fixée.
  13. Agencement d'électrode selon l'une des revendications 10 à 12,
    caractérisé en ce que
    l'électrode est fixée devant l'ouverture (25') d'une chambre (25) de l'agencement, en formant un interstice d'air (19), la chambre communiquant avec une entrée d'air de l'agencement (6).
  14. Agencement d'électrode selon la revendication 10,
    caractérisé en ce que
    l'électrode (29) est réalisée, sous forme d'un élément essentiellement rigide, en particulier sous forme d'une électrode à pointe, qui est fixée sur un élément vibreur (30).
  15. Agencement d'électrode (36) pour la génération d'un champ électrique dans le cadre de dispositifs de revêtement pour le revêtement électrostatiquement assisté,
    caractérisé en ce que
    l'agencement (36) comprend au moins une électrode (39) disposée et apte à être entraînée en rotation autour d'un axe de rotation.
  16. Agencement d'électrode selon la revendication 15,
    caractérisé en ce que
    l'agencement comprend un moyen d'entraînement à moteur électrique pour la mise en mouvement de rotation, ou un moyen d'entraînement rotatif (38) à entraînement en rotation par un jet d'air.
  17. Dispositif de revêtement (1) pour le revêtement d'objets (3), en particulier des objets en mouvement,
    comprenant un agencement d'électrode selon l'une des revendications 10 à 16.
EP04738048A 2003-07-07 2004-06-29 Procede de revetement d'objets, systeme d'electrode et dispositif de revetement Expired - Lifetime EP1641568B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH11902003 2003-07-07
PCT/CH2004/000407 WO2005002738A1 (fr) 2003-07-07 2004-06-29 Procede de revetement d'objets, systeme d'electrode et dispositif de revetement

Publications (2)

Publication Number Publication Date
EP1641568A1 EP1641568A1 (fr) 2006-04-05
EP1641568B1 true EP1641568B1 (fr) 2008-05-21

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EP04738048A Expired - Lifetime EP1641568B1 (fr) 2003-07-07 2004-06-29 Procede de revetement d'objets, systeme d'electrode et dispositif de revetement

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Country Link
US (1) US20060153980A1 (fr)
EP (1) EP1641568B1 (fr)
DE (1) DE502004007234D1 (fr)
ES (1) ES2303074T3 (fr)
WO (1) WO2005002738A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BR112012012502A2 (pt) * 2009-11-24 2016-04-19 Klaus Kalwar processo para o tratamento de superfície de um substrato e dispositivo para a concretização do processo
CH713662A2 (de) * 2017-03-30 2018-10-15 Soudronic Ag Pulversprühkopf und Pulverbeschichtungsanlage mit einem solchen.
CN114007764B (zh) * 2019-06-11 2024-03-26 系统陶瓷股份公司 用于粒状材料的分配设备

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2173078A (en) * 1933-10-04 1939-09-12 Behr Manning Corp Production of pile surfaces
US2447374A (en) * 1934-04-25 1948-08-17 Granne Trust Company Method of applying coating materials
GB789581A (en) * 1956-05-31 1958-01-22 Schweitzer Electrostatic Compa Coating composition atomizing head
NL250925A (fr) * 1959-05-12
AT231041B (de) * 1962-02-26 1964-01-10 Gluecksbandwerk G Roth & Cie Vorrichtung zur Herstellung von ein- und mehrfarbig beflockten Materialien
US3290169A (en) * 1962-09-10 1966-12-06 Interplanetary Res & Dev Corp Process and apparatus for electrostatic detearing
FR1367496A (fr) * 1963-04-24 1964-07-24 Sames Mach Electrostat Perfectionnements au revêtement électrostatique d'objets
US4808432A (en) * 1986-08-18 1989-02-28 Electrostatic Technology Incorporated Electrostatic coating apparatus and method
DE4227455C2 (de) * 1992-08-19 1996-04-04 Wagner Int Vorrichtung zum elektrostatischen Nachbeschichten der Innenflächen von Schweißnähten

Also Published As

Publication number Publication date
DE502004007234D1 (fr) 2008-07-03
EP1641568A1 (fr) 2006-04-05
ES2303074T3 (es) 2008-08-01
WO2005002738A1 (fr) 2005-01-13
US20060153980A1 (en) 2006-07-13

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