EP0442019A1 - Procédé de mise en oeuvre d'un pistolet électrostatique et pneumatique pour la pulvérisation de peintures - Google Patents

Procédé de mise en oeuvre d'un pistolet électrostatique et pneumatique pour la pulvérisation de peintures Download PDF

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Publication number
EP0442019A1
EP0442019A1 EP90103066A EP90103066A EP0442019A1 EP 0442019 A1 EP0442019 A1 EP 0442019A1 EP 90103066 A EP90103066 A EP 90103066A EP 90103066 A EP90103066 A EP 90103066A EP 0442019 A1 EP0442019 A1 EP 0442019A1
Authority
EP
European Patent Office
Prior art keywords
compressed air
paint
outlet opening
electrostatic
pressure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP90103066A
Other languages
German (de)
English (en)
Other versions
EP0442019B1 (fr
Inventor
Gerhard Dipl.-Ing. Gebauer (Fh)
Johann Ing. Htl Gruber
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.)
J Wagner GmbH
Original Assignee
J Wagner GmbH
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 J Wagner GmbH filed Critical J Wagner GmbH
Priority to EP90103066A priority Critical patent/EP0442019B1/fr
Priority to DK90103066.8T priority patent/DK0442019T3/da
Priority to DE90103066T priority patent/DE59004556D1/de
Priority to US07/654,342 priority patent/US5188290A/en
Publication of EP0442019A1 publication Critical patent/EP0442019A1/fr
Application granted granted Critical
Publication of EP0442019B1 publication Critical patent/EP0442019B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B05B5/03—Discharge apparatus, e.g. electrostatic spray guns characterised by the use of gas, e.g. electrostatically assisted pneumatic spraying

Definitions

  • the invention relates to an electrostatic compressed air paint spray gun according to the preamble of claim 1.
  • electrostatic compressed air paint spray guns have been known for decades and, based on the basic structure mentioned, in a wide variety of designs on the market.
  • electrostatic compressed air paint spray guns are comparatively simple. This means that no rotary drive and no rotating parts are required, as is the case with the electrostatic rotary paint spray guns.
  • the paint-guiding parts, valves and seals are not exposed to high pressures, because one color print is sufficient to ensure that the paint is conveyed properly to the paint outlet nozzle;
  • the compressed air atomizes and transports the paint.
  • the compressed air supply can be made by connecting to the usually existing compressed air network; the pressure of around 6 to 8 bar, which usually prevails in these compressed air networks, is fully sufficient.
  • the high voltage is either supplied by a cable from a separate high voltage generator or generated by means of so-called high voltage cascades in the gun itself.
  • the object of the present invention is now to improve an electrostatic compressed air paint spray gun of the type mentioned in such a way that, while maintaining the previous advantages, that is to say the constructional simplicity mentioned, values for the precipitation efficiency and the encompassment are ensured, as have hitherto only been essential complex electrostatic rotary paint spray guns have been achieved.
  • the solution to this problem results from the characterizing features of patent claim 1.
  • the invention is based on the knowledge gained from numerous test series that the disadvantages of the electrostatic compressed air atomizing guns mentioned hitherto are primarily due to the fact that the compressed air emerging from the ring of holes or the annular gap has considerable turbulence.
  • This turbulence means that even if the middle path of the kinetic energy of the atomized paint particles or their average speed remains within limits, individual areas of the spray jet and thus parts of the paint particles get such a high speed that the particles in question not only as a result of their high kinetic energy tend to bounce off the workpiece or fly past it (lack of color change), but especially due to its short dwell time within of the corona area of the electrode arrangement are only insufficiently charged, as a result of which the first-mentioned effect (rebound, lack of wrap) is significantly increased.
  • the invention now ensures that the compressed air emerges from its outlet opening in a substantially laminar flow, that is to say as a calmed and uniform air flow. This is achieved by working below the specified limit for the ratio between the pressure before and after the compressed air outlet openings, that is to say in the so-called subsonic flow area. Of course, one will remain close to this limit in order to ensure sufficient atomization of the paint and proper transport of the atomized paint particles to the workpiece, and in particular an amount of air (air throughput through the outlet openings) is required that is at least as high as and possibly higher than at the previously known, with a pressure ratio of, for example, 6: 1 electrostatic compressed air atomizing guns.
  • the front end of the spray gun on the spray side also called the spray head, has a paint feed pipe 10, which ends at its spray end in a central paint outlet nozzle 11.
  • the ink outlet opening 11 is surrounded concentrically by a compressed air outlet in the form of an annular gap 12, which is delimited by the edge of a so-called air cap 13.
  • a flange 14 of the paint feed pipe 10, which is provided with holes 15, encloses an air chamber 16 between Paint feed pipe 10 and air cap 13 from the rear.
  • the air cap 13 is made of insulating material; the ink supply pipe 10 with nozzle 11 is preferably also made of insulating material, but could also consist of metal.
  • Needle electrodes 17 protrude from the spray-side end face of the air cap 13, specifically as a needle ring concentric with the paint outlet nozzle 11.
  • the needle electrodes 17 are conductively connected via lines 17a running in the air cap 13 to a contact ring 18 located on the rear face of the air cap 13.
  • the spray head shown in the drawing sits at the front end of the - not shown - pistol tube of the paint spray gun, the paint being supplied via the paint supply pipe 10, the compressed air through the bores 15 and the high voltage via the contact ring 18.
  • the drawn and described spray head corresponds completely to the usual state of the art in terms of structure and mode of operation.
  • the pressure p 1 of the compressed air in the air chamber 16 that is to say immediately upstream of the annular gap 12, is limited to a certain maximum value, namely such that the ratio V L of the pressure p 1 to Pressure p2 in front of the spray head, i.e. downstream of the annular gap 12, is less than 2: 1.
  • V L the ratio of the pressure p 1 to Pressure p2 in front of the spray head, i.e. downstream of the annular gap 12
  • the pressure p1 must remain below 2 bar absolute or below 1 bar overpressure. Is sprayed in a closed spray booth with suction, in which the pressure p2 is slightly below atmospheric pressure, the pressure P1 must be chosen accordingly lower.
  • This comparatively low pressure in the air chamber 16 is achieved by, for example, connecting the paint spray gun to a conventional compressed air system which has a substantially higher pressure, but using pressure reducing valves in or in front of the bores 15.
  • a motor-driven blower to spray the paint gun to supply with compressed air that delivers compressed air corresponding to low pressures, for example a so-called “vacuum cleaner motor blower”.
  • the delivered blower air experiences a temperature rise, and in order to avoid that the atomized paint particles "dry" by the heated air before reaching the workpiece, it is advisable to provide a cooling element, such as a cooling ring, as is the case with 19 in the drawing is indicated.
  • the amount of air is sufficient, ie the throughput of compressed air through the annular gap 12 in the unit of time. Practical tests have shown that the amount of air must be as large as or greater than the amount of air that is passed through with the usual compressed air guns with a supply pressure of the compressed air of about 6 bar. This requires a considerable size of the passage area of the annular gap 12, which must be much larger than in the case of the conventional compressed air paint spray guns, for example by a factor of 2 or 3.
  • the procedure is such that the pressure and amount of the compressed air supplied and the size of the exit area of the annular gap are matched to the maximum paint throughput of the paint spray gun when using the toughest paints and by externally actuated air valves, namely a pressure reducing valve and / or a quantity reducing valve, the operator is given the opportunity to make an adjustment with lower ink throughput and / or with more easily atomizable colors.
  • the electrode arrangement can be designed in the usual way, but it is expedient to arrange the electrodes close to the paint outlet, for example also as a central needle electrode in the paint outlet nozzle, in order to ensure that all paint particles pass through the corona area, i.e. the area with the highest field strength. It is also important that part of the droplet transport energy is supplied by the electrostatic field. The level of the applied voltage is therefore also an important factor and must be included in the coordination, especially when spraying paints of different electrical conductivity (water-based paint).
  • electrostatic compressed air paint spray gun according to the invention achieves an unusually high precipitation efficiency, which not only leads to cost savings, but also significantly reduces environmental pollution.
  • an excellent color change is achieved, for example when spraying pipes, as was previously only possible with electrostatic rotary paint spray guns.
  • color chosen here should of course include all electrostatically sprayable coating liquids, in particular varnishes of any consistency.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
EP90103066A 1990-02-16 1990-02-16 Procédé de mise en oeuvre d'un pistolet électrostatique et pneumatique pour la pulvérisation de peintures Expired - Lifetime EP0442019B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP90103066A EP0442019B1 (fr) 1990-02-16 1990-02-16 Procédé de mise en oeuvre d'un pistolet électrostatique et pneumatique pour la pulvérisation de peintures
DK90103066.8T DK0442019T3 (da) 1990-02-16 1990-02-16 Fremgangsmåde til drift af en elektrostatisk trykluftfarvesprøjtepistol
DE90103066T DE59004556D1 (de) 1990-02-16 1990-02-16 Verfahren zum Betreiben einer elektrostatischen Druckluft-Farbspritzpistole.
US07/654,342 US5188290A (en) 1990-02-16 1991-02-12 Electrostatic compressed air paint spray gun

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP90103066A EP0442019B1 (fr) 1990-02-16 1990-02-16 Procédé de mise en oeuvre d'un pistolet électrostatique et pneumatique pour la pulvérisation de peintures

Publications (2)

Publication Number Publication Date
EP0442019A1 true EP0442019A1 (fr) 1991-08-21
EP0442019B1 EP0442019B1 (fr) 1994-02-09

Family

ID=8203660

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90103066A Expired - Lifetime EP0442019B1 (fr) 1990-02-16 1990-02-16 Procédé de mise en oeuvre d'un pistolet électrostatique et pneumatique pour la pulvérisation de peintures

Country Status (4)

Country Link
US (1) US5188290A (fr)
EP (1) EP0442019B1 (fr)
DE (1) DE59004556D1 (fr)
DK (1) DK0442019T3 (fr)

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CN103263988A (zh) * 2013-06-03 2013-08-28 江苏大学 农用气力式静电雾化喷枪
US11950677B2 (en) 2019-02-28 2024-04-09 L'oreal Devices and methods for electrostatic application of cosmetics

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US5765761A (en) * 1995-07-26 1998-06-16 Universtiy Of Georgia Research Foundation, Inc. Electrostatic-induction spray-charging nozzle system
US5873523A (en) * 1996-02-29 1999-02-23 Yale University Electrospray employing corona-assisted cone-jet mode
US6405936B1 (en) 1996-05-13 2002-06-18 Universidad De Sevilla Stabilized capillary microjet and devices and methods for producing same
US6595202B2 (en) 1996-05-13 2003-07-22 Universidad De Sevilla Device and method for creating aerosols for drug delivery
US6197835B1 (en) * 1996-05-13 2001-03-06 Universidad De Sevilla Device and method for creating spherical particles of uniform size
US5947377A (en) * 1997-07-11 1999-09-07 Nordson Corporation Electrostatic rotary atomizing spray device with improved atomizer cup
US6244522B1 (en) * 1999-05-10 2001-06-12 Nordson Corporation Nozzle assembly for dispensing head
MXPA05006958A (es) * 2002-12-26 2006-03-10 Maintech Co Ltd Metodo para proporcionar a una lona de maquina para fabricar papel con agente antitincion mediante aspersion y un dispositivo de aspersion deslizante y un agente antiticion para utilizarse en el.
US6915966B2 (en) * 2003-01-29 2005-07-12 Specialty Minerals (Michigan) Inc. Apparatus for the gunning of a refractory material and nozzles for same
US20100022414A1 (en) * 2008-07-18 2010-01-28 Raindance Technologies, Inc. Droplet Libraries
GB0307403D0 (en) 2003-03-31 2003-05-07 Medical Res Council Selection by compartmentalised screening
US20060078893A1 (en) * 2004-10-12 2006-04-13 Medical Research Council Compartmentalised combinatorial chemistry by microfluidic control
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US7128283B1 (en) 2004-02-02 2006-10-31 Shahin Yousef A Paint spraying nozzle assembly
US20050221339A1 (en) * 2004-03-31 2005-10-06 Medical Research Council Harvard University Compartmentalised screening by microfluidic control
JP4379473B2 (ja) * 2004-04-23 2009-12-09 パナソニック電工株式会社 静電霧化器を備えた加熱送風装置
US7968287B2 (en) 2004-10-08 2011-06-28 Medical Research Council Harvard University In vitro evolution in microfluidic systems
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US7854397B2 (en) * 2005-01-21 2010-12-21 Specialty Minerals (Michigan) Inc. Long throw shotcrete nozzle
US7886990B2 (en) * 2005-04-22 2011-02-15 Ingo Werner Scheer Atomizing device with precisely aligned liquid tube and method of manufacture
US7700016B2 (en) * 2005-08-02 2010-04-20 Solidscape, Inc. Method and apparatus for fabricating three dimensional models
EP1984738A2 (fr) 2006-01-11 2008-10-29 Raindance Technologies, Inc. Dispositifs microfluidiques et leurs procédés d'utilisation dans la formation et le contrôle de nanoréacteurs
US9562837B2 (en) 2006-05-11 2017-02-07 Raindance Technologies, Inc. Systems for handling microfludic droplets
EP4190448A3 (fr) 2006-05-11 2023-09-20 Bio-Rad Laboratories, Inc. Dispositifs microfluidiques
US9012390B2 (en) 2006-08-07 2015-04-21 Raindance Technologies, Inc. Fluorocarbon emulsion stabilizing surfactants
US7735748B1 (en) * 2006-10-10 2010-06-15 Ingo Werner Scheer Spray nozzle with improved tip and method of manufacture
US8772046B2 (en) 2007-02-06 2014-07-08 Brandeis University Manipulation of fluids and reactions in microfluidic systems
US8592221B2 (en) 2007-04-19 2013-11-26 Brandeis University Manipulation of fluids, fluid components and reactions in microfluidic systems
US12038438B2 (en) 2008-07-18 2024-07-16 Bio-Rad Laboratories, Inc. Enzyme quantification
US8528589B2 (en) 2009-03-23 2013-09-10 Raindance Technologies, Inc. Manipulation of microfluidic droplets
EP2486409A1 (fr) 2009-10-09 2012-08-15 Universite De Strasbourg Nanomatériau marqué à base de silice à propriétés améliorées et ses utilisations
EP2517025B1 (fr) 2009-12-23 2019-11-27 Bio-Rad Laboratories, Inc. Procédés pour réduire l'échange de molécules entre des gouttelettes
US10351905B2 (en) 2010-02-12 2019-07-16 Bio-Rad Laboratories, Inc. Digital analyte analysis
US9399797B2 (en) 2010-02-12 2016-07-26 Raindance Technologies, Inc. Digital analyte analysis
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US9364803B2 (en) 2011-02-11 2016-06-14 Raindance Technologies, Inc. Methods for forming mixed droplets
EP2675819B1 (fr) 2011-02-18 2020-04-08 Bio-Rad Laboratories, Inc. Compositions et méthodes de marquage moléculaire
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Cited By (2)

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Publication number Priority date Publication date Assignee Title
CN103263988A (zh) * 2013-06-03 2013-08-28 江苏大学 农用气力式静电雾化喷枪
US11950677B2 (en) 2019-02-28 2024-04-09 L'oreal Devices and methods for electrostatic application of cosmetics

Also Published As

Publication number Publication date
DE59004556D1 (de) 1994-03-24
EP0442019B1 (fr) 1994-02-09
US5188290A (en) 1993-02-23
DK0442019T3 (da) 1995-03-13

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