EP2637799B1 - Verfahren zum elektrostatischen beschichten von gegenständen sowie applikationsvorrichtung - Google Patents

Verfahren zum elektrostatischen beschichten von gegenständen sowie applikationsvorrichtung Download PDF

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Publication number
EP2637799B1
EP2637799B1 EP11787784.5A EP11787784A EP2637799B1 EP 2637799 B1 EP2637799 B1 EP 2637799B1 EP 11787784 A EP11787784 A EP 11787784A EP 2637799 B1 EP2637799 B1 EP 2637799B1
Authority
EP
European Patent Office
Prior art keywords
counter electrode
application device
potential
painting
electrode
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP11787784.5A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2637799A1 (de
Inventor
Werner Swoboda
Jan Reichler
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.)
Eisenmann SE
Original Assignee
Eisenmann SE
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 Eisenmann SE filed Critical Eisenmann SE
Publication of EP2637799A1 publication Critical patent/EP2637799A1/de
Application granted granted Critical
Publication of EP2637799B1 publication Critical patent/EP2637799B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/007—Processes for applying liquids or other fluent materials using an electrostatic field
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/08—Plant for applying liquids or other fluent materials to objects
    • B05B5/087—Arrangements of electrodes, e.g. of charging, shielding, collecting electrodes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B14/00—Arrangements for collecting, re-using or eliminating excess spraying material
    • B05B14/40—Arrangements for collecting, re-using or eliminating excess spraying material for use in spray booths
    • B05B14/42—Arrangements for collecting, re-using or eliminating excess spraying material for use in spray booths using electrostatic means
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/08—Plant for applying liquids or other fluent materials to objects
    • B05B5/10—Arrangements for supplying power, e.g. charging power

Definitions

  • the invention relates to a method for the electrostatic coating of objects, in which an electric field is generated between an application device and an object to be coated.
  • the paint particles thus charged are attracted to the object due to the electrical field formed between the application device and the object, are deposited thereon and are thereby discharged. However, only a part of the delivered by the application device passes Lacquers to the object. A partial flow of the paint, which generally contains both solid and / or binder and solvent, is not applied to the article. This partial flow is called "overspray" in the professional world.
  • This object is achieved by a method of the type mentioned in that at least one of the application device associated corona electrode to ground potential and at least one of the object associated counter electrode is at least temporarily placed on a positive potential.
  • the invention is based on the finding that directed electrostatic application of coating material can still be carried out safely even if an electric field is built up between the application device and the object, which in the direction of the application device becomes a field strength gradient from ground potential to positive High voltage potential has.
  • the article When an article is to be coated which is electrically conductive, the article advantageously becomes a counter electrode used.
  • an object is to be coated which is not electrically conductive, it is particularly favorable if at least temporarily an auxiliary counterelectrode is used as counterelectrode, which is arranged on a side of the object remote from the application device.
  • the object and the auxiliary counter electrode form a counter electrode system and are placed independently of one another on a high voltage potential whose size is adjustable.
  • Applied coating material in particular paint, is usually electrically conductive, as long as it has not cured.
  • the partially coated object can serve as a counterelectrode over time, as is the case with the electrically conductive object from the outset.
  • the cabin wall of a paint booth in which the application device, the counter electrode and the object are arranged, is set to ground potential. Then, the paint booth can be made very compact, so that even then only a small coating of the cabin wall takes place when it is arranged relative to known devices relatively close to the object. It is advantageous if a cylindrical cabin wall is used.
  • the counter electrode may advantageously be formed by the object.
  • the counterelectrode is at least temporarily formed by an auxiliary counterelectrode which is arranged on a side of the object remote from the application device.
  • the object and the auxiliary counterelectrode preferably form a counter-electrode system and are preferably independently of one another able to be laid on a high-voltage potential whose size is adjustable.
  • the cabin wall of a paint booth, in which the application device, the counter electrode and the object are arranged is at ground potential.
  • the cabin wall is cylindrical.
  • FIG. 1 Referenced.
  • the painting cabin 12 delimits, with a cylindrical cabin wall 14, an interior space 16 which is functionally subdivided into an upper painting area 18 and a deposition area 20 arranged below it.
  • a cabin ceiling 22 Via a cabin ceiling 22, which is formed in the usual way as the lower boundary of a not shown here HeilzuGermanraumes with filter cover, air can be supplied to the Lackier Scheme 18 from above and flow through it down into the separation area 20.
  • an electrostatic separating device 24 which comprises a plurality of planar and parallel to each other arranged deposition plates 26, of which only two reference numerals. Between each two Abscheideplatten 26 is in each case an electrode unit 28 with corona wires 28a and a plate or grid electrode 28b, only one of which is provided with reference numerals. Each electrode unit 28 is connected to a pole of a high voltage source not specifically shown. The separation plates 24 are connected to ground potential via the other pole of the high voltage source.
  • electrostatic precipitator is basically known from the prior art and therefore needs no further explanation.
  • cabin air After cabin air has passed through the separation device 24, it exits the spray booth 12 via a lower cabin opening 30 and can be fed back into the above-mentioned air feed space, if appropriate after further conditioning.
  • the main flow direction of the cabin air is indicated by the arrows 32.
  • an application device in the form of a stationary spray nozzle 34 is arranged, which is supplied with paint via a supply line 36 from a paint reservoir.
  • the spray nozzle 34 operates pneumatically and produces a downward spray, which is indicated schematically and the reference numeral 38 carries.
  • application devices can also be provided which function according to other operating principles. Examples include for this purpose so-called airless sprayers and atomizers such as bell sprayers and piezo atomizers called, as they are known per se.
  • the spray nozzle 34 comprises a jacket sleeve 40, whose longitudinal axis is vertical and which is mounted displaceably in the vertical direction.
  • the lower edge of the jacket sleeve 40 carries a plurality of evenly distributed in the circumferential direction and projecting downwards Ionisationsnadeln 42.
  • the jacket sleeve 40 is connected via a line 44 to a pole of a high voltage source 46 and so placed at ground potential.
  • the other pole of the high voltage source 46 is connected via a line 48 with an object to be coated 50, which must be electrically conductive.
  • the article 50 can be placed over the high voltage source 46 to a positive high voltage potential.
  • the object 50 is moved by means of a multi-axis application robot 52, as it is known per se, in a defined sequence of movements in the spray jet 38 of the spray nozzle 34.
  • the application robot 52 comprises a front free arm part 54, which carries the object 50 and is at its potential, as well as a rear part 56 insulated therefrom, which is placed at ground potential.
  • the front free arm part 54 of the application robot 52 can be guided through an opening 58 in the cabin wall 14 into the painting area 18 of the painting cabin 12 and moved there.
  • jacket sleeve 40 with the ionization needles 42 and the rear part 52b of the application robot 52 and the cylindrical cabin wall 14 is set to ground potential.
  • the Ionisationsnadeln 42 and the object 50 are connected to the corresponding poles of the high voltage source 46 and this is activated, formed due to the potential difference between the Ionisationsnadeln 42 and the object 50, an electric field.
  • the object 50 thus operates as a counter electrode 60 to the Ionisationsnadeln 42.
  • an electric field device is formed by the Ionisationsnadeln 42, the counter electrode 60 and the high voltage source 46 through which between the spray nozzle 34 and the object to be coated 50, an electric field is generated.
  • the ionizing needles 42 form the spray nozzle 34 associated corona electrodes, which emit electrons due to the present potential difference and work as a discharge electrodes. Since the ionizing needles 42 have a greater curvature at their tip than the object 50, the polarity of the ionizing needles 42 also dictates the polarity of the corona forming.
  • the spray nozzle 34 is now activated and releases paint particles, creating a paint mist comprising air and paint particles. Both the air and the paint particles are ionized at the Ionisationsnadeln 42 and migrate due to the existing electric field to the object 50, which is thereby coated.
  • an arcuate potential line 76 is shown in the region of the spray jet 38. There is a field strength of about +10 kV in the illustrated potential conditions
  • the paint particles are repelled by the lying at ground potential spray nozzle 34 and the jacket sleeve 40 with the Ionisationsnadeln 42, but also from all other components lying at ground potential in the spray booth 12.
  • the latter are, in particular, the above-mentioned cabin wall 14 and the rear part 56 of the application robot 52.
  • the separation device 24 is provided, which operates in a manner known per se.
  • FIG. 2 is shown as a second embodiment, a modified painting device 10 '.
  • this carry components that correspond to those of the painting device 10 of Figure 1, the same reference numerals.
  • the high-voltage source 46 is set up so that a positive high-voltage potential whose size can be set can be applied to the object 50.
  • auxiliary front electrode 54 of the application robot 52 carries an auxiliary counter electrode 64.
  • This auxiliary counter electrode 64 has a lens-shaped electrode head 66 and is connected via a fixing unit 68 with the application robot 52 so that they always stationary on a remote from the spray nozzle 34 Side of the object 50 is located. In this case, one of the main surfaces of the electrode head 66 to the object 50th
  • auxiliary counter-electrode 64 can also be applied a positive high voltage potential, the size of which is adjustable, to which it is connected via a line 70 to the high voltage source 46 accordingly.
  • the line 70 is indicated by a dashed line.
  • the counter electrode 60 in the form of the article 50 and the auxiliary counter electrode 64 with the electrode head 66 form a counter electrode system 72 and can be set independently of one another to a positive high voltage potential.
  • the spray nozzle 34 is activated and the at the ionization needles 42 ionized paint particles migrate toward the object 50 and the second counter electrode 64. A proportion of these paint particles separates on the way to the auxiliary counter electrode 64 on the object 50 from.
  • the object 50 is now electrically conductive at least on its surface.
  • the contacting of the article 50 to the high voltage source 46 is formed so that the applied paint is applied at a sufficient layer thickness with high voltage.
  • the thicker the lacquer layer on the object 50 the greater the high-voltage potential applied to it, and the better the object 50 itself can act as the counterelectrode 60.
  • FIG. 3 is shown as a third embodiment, a further modified painting device 10 "in which carry components that those of the painting device 10 'after FIG. 2 correspond, the same reference numerals.
  • the auxiliary counter-electrode 64 is not connected to the application robot 52, but considered stationary in Lackier Scheme 18 and viewed in the flow direction of the cabin air just before the separation area 20 of the spray booth 12.
  • the auxiliary counterelectrode 64 has a mushroom-shaped electrode head 74 in the coating device 10 "which points in the direction of the object 50.
  • the electrode head 74 of the counterelectrode 64 is connected to the high-voltage source 46 via the line 70 so that an adjustable high-voltage potential can also be applied thereto can be created.
  • the first counter electrode 60 in the form of the article 50 and the auxiliary counter electrode 64 with the mushroom-shaped electrode head 74 form the counterelectrode system 72 and can be set independently of one another to a positive high-voltage potential.
  • the painting device 10 "works like the painting device 10 ', ie at the beginning of painting the mushroom-shaped electrode head 74 is set to a high voltage potential of +50 kV, which is successively reduced in the course of the painting process, in turn, applied to the object 50 High voltage potential is successively increased depending on the build layer thickness of the applied paint.
  • the painting 10, 10 'and 10 can be built very compact with a spray booth 12, compared to conventional spray booths smaller dimensions and less than the size of the article or objects to be coated.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
EP11787784.5A 2010-11-12 2011-10-28 Verfahren zum elektrostatischen beschichten von gegenständen sowie applikationsvorrichtung Not-in-force EP2637799B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010051086.6A DE102010051086B4 (de) 2010-11-12 2010-11-12 Verfahren und Vorrichtung zum elektrostatischen Beschichten von Gegenständen
PCT/EP2011/005472 WO2012062419A1 (de) 2010-11-12 2011-10-28 Verfahren zum elektrostatischen beschichten von gegenständen sowie applikationsvorrichtung

Publications (2)

Publication Number Publication Date
EP2637799A1 EP2637799A1 (de) 2013-09-18
EP2637799B1 true EP2637799B1 (de) 2017-06-07

Family

ID=45033913

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11787784.5A Not-in-force EP2637799B1 (de) 2010-11-12 2011-10-28 Verfahren zum elektrostatischen beschichten von gegenständen sowie applikationsvorrichtung

Country Status (6)

Country Link
US (1) US9795986B2 (pt)
EP (1) EP2637799B1 (pt)
BR (1) BR112013006981A8 (pt)
DE (1) DE102010051086B4 (pt)
RU (1) RU2590927C2 (pt)
WO (1) WO2012062419A1 (pt)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202014005013U1 (de) * 2014-02-20 2014-07-21 Shikhnabel S. Nabiev Vorrichtung zum Auftragen von Stofffolien auf verschiedene Unterlagen
DE102014018903A1 (de) * 2014-12-17 2016-06-23 Eisenmann Se Vorrichtung und Verfahren zum Abscheiden von Partikeln aus einem Abluftstrom einer Beschichtungskabine
EP4098369A1 (de) * 2021-05-31 2022-12-07 KRAUSE Besitz GmbH & Co. KG Vorrichtung und verfahren zur partikelbeeinflussung
JP2023016116A (ja) * 2021-07-21 2023-02-02 トヨタ自動車株式会社 絶縁体の塗装方法および塗装装置

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU142553A1 (ru) * 1961-04-20 1961-11-30 М.С. Демиденко Способ нанесени покрыти в электростатическом поле высокого напр жени на полуфабрикаты из дерева
US3680779A (en) * 1970-10-05 1972-08-01 Oxy Dry Sprayer Corp Method and apparatus for electrostatic spraying
SU679115A3 (ru) * 1977-03-21 1979-08-05 Хайтомювек Еш Фештеберендезешек Дьяра (Инопредприятие) Устройство дл электростатического напылени частиц материала
WO1982002154A1 (en) * 1980-12-24 1982-07-08 Smead Robert G Electrodynamic painting system and method
JPS6475077A (en) 1987-09-12 1989-03-20 Taikisha Kk Spray electrostatic coating method
US5527564A (en) * 1990-03-19 1996-06-18 Stanley C. Napadow Method and apparatus for repelling overspray in spray paint booths
DE9011204U1 (de) 1990-07-30 1990-10-04 Siemens AG, 8000 München Vorrichtung zum elektrischen Beschichten von Substraten
US6475572B2 (en) * 2000-04-06 2002-11-05 3M Innovative Properties Company Electrostatically assisted coating method with focused web-borne charges
MXPA02009852A (es) * 2000-04-06 2003-05-27 3M Innovative Properties Co Metodo y aparato de revestimiento electrostaticamente asistido con campo de electrodo enfocado.
GB2442210B (en) 2006-09-27 2011-12-07 Yu Tung Invest Holdings Ltd Powder spray coating discharge assembly

Also Published As

Publication number Publication date
DE102010051086B4 (de) 2014-06-05
RU2590927C2 (ru) 2016-07-10
WO2012062419A1 (de) 2012-05-18
RU2013126708A (ru) 2014-12-20
CN103201043A (zh) 2013-07-10
BR112013006981A2 (pt) 2016-07-26
BR112013006981A8 (pt) 2017-10-10
US20130216725A1 (en) 2013-08-22
DE102010051086A1 (de) 2012-05-16
US9795986B2 (en) 2017-10-24
EP2637799A1 (de) 2013-09-18

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