US3556400A - Appliance for the electrostatic coating of objects with coating materials in liquid or powder form - Google Patents

Appliance for the electrostatic coating of objects with coating materials in liquid or powder form Download PDF

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Publication number
US3556400A
US3556400A US729297A US3556400DA US3556400A US 3556400 A US3556400 A US 3556400A US 729297 A US729297 A US 729297A US 3556400D A US3556400D A US 3556400DA US 3556400 A US3556400 A US 3556400A
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United States
Prior art keywords
discs
appliance
disc
paint
materials
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Expired - Lifetime
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US729297A
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English (en)
Inventor
Otto Gebhardt
Fred Luderer
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MESSRS ERNST MUELLER LUFT und
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MESSRS ERNST MUELLER LUFT und
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    • 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
    • B05B5/0418—Discharge apparatus, e.g. electrostatic spray guns characterised by having rotary outlet or deflecting elements, i.e. spraying being also effected by centrifugal forces designed for spraying particulate material
    • 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

Definitions

  • Brown ABSTRACT An electrostatic-painting appliance operating at high voltage to ionize paints has at least two parallel-rotating discs to disperse paint on their inner surfaces over a steplike ridge. A distributor ring between the discs permits one or more paint jets to disperse paint selectively to one or both discs to thereby permit mixing or selection of separate colors or constituent parts.
  • the invention concerns an apparatus for the electrostatic coating of objects with coating materials in liquid or powder form, hereinafter referred to as paint.
  • German Pat. No. 1,240,764 a process for electrostatic coating by means of a rotating sprayer-head acting as a hightension electrode with the additional application of air pressure is described, in which the paint, conducted to a sprayerhead rotating at speeds of from 4,000 to preferably 20,000 r.p.m. and higher, is whirled off and vaporized.
  • the paint emanates from centrifugal discharge ridges or points and is diverted and transported to the object being painted by the force of the electric field as well as the air pressure in a conventional manner only after reaching a certain distance from the centrifugal discharge ridge.
  • a device with a disc mounted on a rotating shaft is suggested, in which the coatingmaterial to be vaporized is applied to the backside of this disc, which has a walled ridge functioning as a centrifugal discharge ridge, and in which the disc is surrounded by a stream of air pressure directed at the work and is connected to a high-tension generator.
  • this problem is solved by installing a second rotating spray disc-of at least equal diameter closely behind the first disc and concentric to it, which has a walled ridge functioning as a centrifugal discharge ridge on its front side, to which paint to be vaporized is applied.
  • the two spray discs with their dischargeridges can be supplied with paint through one single, common source. But it is also possible, and this is particularly advantageous, to provide the two spray discs with separate, individual paint feeder jets. In the latter case then, two different materials can be simultaneously sprayed, in which case the ionization gap between the two disc ridges provides for an intensive blending action of the two paint mists.
  • This possibility opens the way to new areas in the field of multicomponent spraying, in which, for example, the one disc may be supplied with lacquer, the other with a setting agent, or, in the case of paintblending, for instance, of metallic lacquers, in which case then the basic material is sprayed from the one ridge, and the material producing the metallic effect from the other one.
  • the design incorporating the separate paint supply method can be applied to perform a rapid color changing operation, in which each of the colors is applied to one of the centrifugal discharge ridges.
  • FIG. 1 is an elevation view, partly in cross section, of the spray head
  • FIG. 2 is a similar cross section view showing a modification of the spray head
  • FIG. 3 is a fragmented view, partly in cross section, through the distributor ring of the spray head of FIG. 2 in large scale;
  • FIG. 4 is a further elevation view, partly in cross section of a modification of the spray head of this invention.
  • FIG. 5 is a fragmental view in section of a modification of the invention.
  • the spray head shown in FIG. 1 consists essentially of a first spray disc I0 and a second one 11 parallel to it on the same axis and equal to it in diameter.
  • the two spray discs 10 and II are fixed in position on the rotating shaft of a motor (not shown), for example, an air pressure motor, which is installed at the forward end of a spray gun.
  • Disc I0 has a rounded edge 12, and is equipped on its reverse side with a steplike projection at the edge of which a centrifugal discharge ridge I3 is formed.
  • the discharge ridge 13 is set back in a radial direction from the rounded edge 12.
  • the second disc 11 has a rounded edge 14, and is equipped on its forward edge with a steplike projection, at the edge of which a centrifugal discharge ridge I5 is formed.
  • the rounded edges 12 and 14, and then the two discharge ridges l3 and 15 extend the same radial distance from the revolving axis of the spray head.
  • a distributor ring 16 is installed coaxially to them, with a diameter smaller than that of the centrifugal discharge ridges I3, 15.
  • the distributor ring 16 has a cross section whose shape resembles roughly that of an equilateral triangle, whose apex 16a is pointed toward the revolving axis of the spray head.
  • a supply tube 17, fixed solidly to the gun and running parallelto the axis of the spray head projects into the space between the two discs 10 and II, and points its jet opening 17a toward the apex of the ring, that is, toward the inner edge 16a of distributor ring 16.
  • the spray head is seated, as mentioned, on the rotating shaft of a motor, and is driven by it at a speed of from 4,000 to 40,000 r.p.m.
  • a jet stream of air pressure is directed at the spray head in such a way, that the spray head is surrounded by the air current directed at the work.
  • the spray head is connected to a high-tension generator, by means of which it is kept under a tension of, for example, 50 to kv.
  • the outer sharp edges 12 and 14 of the spray head therefore, act as ionizing edges.
  • edge 16a of the rotating distributor ring 16 separates the oncoming stream of paint into two equal parts, which are moved across the sloped flanks of the distributor ring 16, and over the'reverse side of disc 10 and the forward side of disc 11, out to the ridges l3 and 15, by the centrifugal forces generated, and are whirled radially outward by these ridges at a high rate of speed.
  • the electrostatic field set up by the introduction of high-tension electricity between the discharge ridges on the one hand and the work on the other ionizes the paint mist as it crosses an imaginary plane formed by the outer edges 12 and 14 and speeds the particles of paint along the lines of the lines of the field toward the work. Since the field needs only to transport the finely atomized particles of paint and is, in addition, supported by air pressure in this transportation process, only relatively low field intensities are required.
  • the paint fed into the apparatus is distributed to two opposing centrifugal discharge ridges l3 and 15, which bring about a dispersion of the paint independent from one another.
  • a discharge ridge increased to twice the length at the same disc diameter is realized.
  • paint discharges increased by I per cent can be achieved with the spray head of this invention, without affecting adversely the quality of paint atomization, i.e., the fineness of the produced paint mist.
  • FIG. 2 represents a second embodiment of the spray head of this invention. This differs from the one described above simply with regard to the method of paint supply and the shape of the distributor ring.
  • two paint supply jets l8 and 19 are provided, in which the jet aperture l8a of the one tube is directed at the upper inclined surface of the distributor ring 16, and jet aperture 19a of tube 19 at the lower one.
  • a guide ring 20 capable of adjustment is installed coaxially to the distributor ring in such a way that the gap for the passage of paint can be adjusted at will.
  • a particularly fine atomization of the painting material can be attained when the discharge ridges l3, 15 are radially straited. It is also possible, as shown in FIG. 3, to apply radial groovings 21 to the guide ring 20, in order to achieve an especially uniform distribution of paint on its way out to the discharge ridges. These riflings in the discharge ridges and/or in the guide ring eliminate air intrusion into the paint and bring about, particularly in extremely viscous lacquers, an appreciably improved surface quality in the applied layer of paint.
  • the spray head shown in FIG. 4 reveals the same basic structure as the one in FIG. 2; however, four discharge ridges are provided. To do this, a discharge ridge 22 is also provided on the reverse side of disc 1 l, and besides, another spray disc 23 with discharge ridge 24 is added. In the space between the reverse side of disc 11 and disc 23 another distributor ring 25 with guide ring 26 is inserted.
  • the paint supply to the four discharge ridges l3, 15, 22 and 24 is done by the four jet apertures 18a, 18b, 18c and 18d of paint supply tube 18 or, perhaps, as it does not show in the drawing, by four separate, individually adjustable paint tubes.
  • the mode of operation of the spray head is obviously identical with that of FIG.
  • FIG. 5 a modification of the spray head ofthis invention is shown, for producing a spray pattern of a smaller diameter, in which, built on the same principle, eight discharge ridges 28, 29, 30, 31, 32, 33, 34 and 35 are installed behind one another.
  • the arrangement is so constructed that the paired ridges facing one another 28 and 29, 30 and 31, 32 and 33, 34 and 35 always have the same diame ter, but that the diameters of the pairs increase from front to back, so that the ridge pair 28, 29 has the-smallest diameter, and the ridge pair 34, 35 the largest one.
  • the entire spray head is encircled, with spacing, by a hull-like guide funnel 36, whose leading edge 36a facing the work functions as an ionizing edge.
  • the paint mist is not electrostatically charged until it leaves the guide funnel 36.
  • the optimum ratio between paint supply to length of discharge ridge occurs automatically.
  • An appliance for electrostatic coating of objects with coating materials in liquid or powder form with a centrifugal discharge device operated at a high electrical potential comprising in combination, at least two parallel discs mounted on a common axis of rotation, with each disc having a steplike projection in the common passageway between the discs to serve as a centrifugal discharge ridge, the discs being mounted with ridges on the discs facing each other, means supplying said materials to the inner surface of each disc to flow separately over both respective discharge ridges and an outer ionizing gap between the outer disc edges coupled with said potential positioned to react electrostatically with the coating materials discharged from each said ridge separately without electrostatic interference.
  • An appliance as defined in claim 2 including separate jets each directed to a respective one of said distributor ring surfaces and each jet separately controlled, whereby different material sources may be used.
  • An appliance as defined in claim 2 including an adjustable guide ring coupled to said distributor ring adapted to control the gap for passage of materials.

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  • Electrostatic Spraying Apparatus (AREA)
  • Details Or Accessories Of Spraying Plant Or Apparatus (AREA)
US729297A 1967-05-17 1968-05-15 Appliance for the electrostatic coating of objects with coating materials in liquid or powder form Expired - Lifetime US3556400A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1967M0074016 DE1652390B2 (de) 1967-05-17 1967-05-17 Vorrichtung zum elektrostatischen ueberziehen von gegenstaenden mit fluessigem oder pulverfoermigem ueberzugsmaterial

Publications (1)

Publication Number Publication Date
US3556400A true US3556400A (en) 1971-01-19

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Family Applications (1)

Application Number Title Priority Date Filing Date
US729297A Expired - Lifetime US3556400A (en) 1967-05-17 1968-05-15 Appliance for the electrostatic coating of objects with coating materials in liquid or powder form

Country Status (8)

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US (1) US3556400A (es)
BE (1) BE715226A (es)
CH (1) CH466100A (es)
DE (1) DE1652390B2 (es)
ES (1) ES353953A1 (es)
FR (1) FR1562746A (es)
GB (1) GB1198946A (es)
SE (1) SE330847B (es)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE31590E (en) * 1977-02-07 1984-05-29 Ransburg Japan, Ltd. Atomization in electrostatic coating
US4458844A (en) * 1977-02-07 1984-07-10 Ransburg Japan Ltd. Improved rotary paint atomizing device
US6105886A (en) * 1995-05-19 2000-08-22 Nordson Corporation Powder spray gun with rotary distributor
WO2001084947A2 (en) * 2000-05-10 2001-11-15 Wilevco, Inc. Atomizing device for coating apparatus
US6634568B1 (en) * 1998-09-25 2003-10-21 Sandvik Ab Method and means for drying cemented carbide and similar
US20050006496A1 (en) * 2000-08-03 2005-01-13 Barry Partington Apparatus and method for producing porous polymer particles
US7017836B1 (en) * 2004-04-16 2006-03-28 Wilevco, Inc. Rotary atomizer coating distribution apparatus
US8141797B2 (en) 2001-01-25 2012-03-27 Durr Systems Inc. Rotary atomizer for particulate paints

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2659428C2 (de) * 1976-12-29 1981-11-19 Ransburg Gmbh, 6056 Heusenstamm Vorrichtung zum elektrostatischen Versprühen von auf Werkstücken aufzutragendem flüssigen Überzugsmaterial
JPS53147740A (en) * 1977-05-31 1978-12-22 Ransburg Japan Ltd Rotary atomizing apparatus for electrostatic coating of liquid paint
GB8611460D0 (en) * 1986-05-10 1986-06-18 Case Systems Ltd Spray devices
DE3716692C2 (de) * 1987-05-19 1995-02-09 Lactec Gmbh Rotationszerstäuber
DE4024805C1 (es) * 1990-08-04 1992-02-06 Metallgesellschaft Ag, 6000 Frankfurt, De
DE10053292C1 (de) * 2000-10-27 2002-05-23 Eisenmann Lacktechnik Kg Hochrotationszerstäuber zur Aufbringung von Pulverlack

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1870099A (en) * 1930-09-01 1932-08-02 Walter B Croan Atomizer
US2166772A (en) * 1937-03-28 1939-07-18 Salsas-Serra Francisco Atomizer for liquids
US2220275A (en) * 1939-02-17 1940-11-05 Murray D J Mfg Co Spray producer
FR877857A (fr) * 1941-08-01 1943-01-05 Perfectionnements aux procédés et appareils permettant d'activer l'excitation superficielle, résultant de la force centrifuge, utilisée pour la mise en suspension dans l'air d'un fluide ultra-dispersé ou autres produits secs en poudre
US2369216A (en) * 1942-05-27 1945-02-13 George B Crisp Combustible preparing device
DE884325C (de) * 1948-07-10 1953-07-27 Hauser & Cie Ag Neumuehle Toes Vorrichtung zum Zerstaeuben von Fluessigkeiten
US3346192A (en) * 1963-12-18 1967-10-10 Hege Hermann Atomizing apparatus

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1870099A (en) * 1930-09-01 1932-08-02 Walter B Croan Atomizer
US2166772A (en) * 1937-03-28 1939-07-18 Salsas-Serra Francisco Atomizer for liquids
US2220275A (en) * 1939-02-17 1940-11-05 Murray D J Mfg Co Spray producer
FR877857A (fr) * 1941-08-01 1943-01-05 Perfectionnements aux procédés et appareils permettant d'activer l'excitation superficielle, résultant de la force centrifuge, utilisée pour la mise en suspension dans l'air d'un fluide ultra-dispersé ou autres produits secs en poudre
US2369216A (en) * 1942-05-27 1945-02-13 George B Crisp Combustible preparing device
DE884325C (de) * 1948-07-10 1953-07-27 Hauser & Cie Ag Neumuehle Toes Vorrichtung zum Zerstaeuben von Fluessigkeiten
US3346192A (en) * 1963-12-18 1967-10-10 Hege Hermann Atomizing apparatus

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE31590E (en) * 1977-02-07 1984-05-29 Ransburg Japan, Ltd. Atomization in electrostatic coating
US4458844A (en) * 1977-02-07 1984-07-10 Ransburg Japan Ltd. Improved rotary paint atomizing device
US6105886A (en) * 1995-05-19 2000-08-22 Nordson Corporation Powder spray gun with rotary distributor
US7036748B2 (en) 1998-09-25 2006-05-02 Sandvik Ab Method and apparatus for the drying of cemented carbide powder and the like
US6634568B1 (en) * 1998-09-25 2003-10-21 Sandvik Ab Method and means for drying cemented carbide and similar
US20040050957A1 (en) * 1998-09-25 2004-03-18 Sandvik Ab Method and apparatus for the drying of cemented carbide powder and the like
WO2001084947A3 (en) * 2000-05-10 2002-03-28 Spinning Disc Inc Atomizing device for coating apparatus
WO2001084947A2 (en) * 2000-05-10 2001-11-15 Wilevco, Inc. Atomizing device for coating apparatus
KR100778323B1 (ko) 2000-05-10 2007-11-27 와일브코, 인코포레이티드 겉에 덧입히는 장치 및 사용 방법
US20050006496A1 (en) * 2000-08-03 2005-01-13 Barry Partington Apparatus and method for producing porous polymer particles
US7207499B2 (en) * 2000-08-03 2007-04-24 Prometic Biosciences Ltd Apparatus and method for producing porous polymer particles
US8141797B2 (en) 2001-01-25 2012-03-27 Durr Systems Inc. Rotary atomizer for particulate paints
US7017836B1 (en) * 2004-04-16 2006-03-28 Wilevco, Inc. Rotary atomizer coating distribution apparatus

Also Published As

Publication number Publication date
DE1652390A1 (de) 1970-07-16
BE715226A (es) 1968-10-16
SE330847B (es) 1970-11-30
GB1198946A (en) 1970-07-15
FR1562746A (es) 1969-04-04
DE1652390B2 (de) 1977-03-17
ES353953A1 (es) 1970-02-01
CH466100A (de) 1968-11-30

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