US3799112A - Vat device for the treatment of articles in a fluidified medium - Google Patents

Vat device for the treatment of articles in a fluidified medium Download PDF

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Publication number
US3799112A
US3799112A US00192623A US19262371A US3799112A US 3799112 A US3799112 A US 3799112A US 00192623 A US00192623 A US 00192623A US 19262371 A US19262371 A US 19262371A US 3799112 A US3799112 A US 3799112A
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United States
Prior art keywords
powder
channel
vat
container
treatment
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Expired - Lifetime
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US00192623A
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English (en)
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A Huteaux
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SOMIP
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SOMIP
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C19/00—Apparatus specially adapted for applying particulate materials to surfaces
    • B05C19/02—Apparatus specially adapted for applying particulate materials to surfaces using fluidised-bed techniques
    • B05C19/025—Combined with electrostatic means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S118/00—Coating apparatus
    • Y10S118/05—Fluidized bed

Definitions

  • Vat device for the treatment of articles in a fluidified [30] Foreign Application Priority Data medlurn, adapted to perform the coating of various artlcles with a view to carrymg out any appropriate sur- OCI. 27, France face treatment comprising an p p vat having at least one substantially horizontal spraying pipe pro- 118/629 1 l8/DIG' vided in the upper portion of the vat in proximity to a I o a v o I I I u I I I a l a u I a a s s I I a I a I) f t 581 Field of Search ll8/DIG. 5, 50, 50.1, 308, wall the sad spraymg mg the References Cited UNITED STATES PATENTS 7/1930 Strickland 118/316 vat a thin and substantially horizontal layer of fluidified powder.
  • the present invention has essentially for its object a vat device for the treatment of articles in a fluidified medium, adapted for instance to form a coating on various articles by means of a powder suspended in a fluidified medium, in view of any appropriate surface treatment.
  • a vat device for the treatment of articles in a fluidified medium, adapted for instance to form a coating on various articles by means of a powder suspended in a fluidified medium, in view of any appropriate surface treatment.
  • articles are coated by way of electrostatic deposition of a powder, by applying different potentials to the powder and the articles.
  • the powder may be suspended in a fluidified medium in a tunnel in which the articles are displaced by a conveyor.
  • the powder-coated articles may thereafter be subjected to the treatment desired, for instance a baking treatment in a furnace if the powder-coating obtained is to be baked.
  • the present invention is directed at a simplified and relatively inexpensive device permitting small or largescale treatment of articles of any shape and dimensions.
  • the device according to the invention is in fact a vat device for the treatment of articles in a fluidified medium, which is characterized in that it is constituted by an open-top vat comprising at least one substantially horizontal spraying pipe provided in the upper portion of the vat in proximity to a wall of the latter, the said spraying pipe ejecting the fluidified powder into the vat.
  • the vat is substantially in the shape of a right-angled parallelepiped and is provided with two said spraying pipes arranged in substantially confronting relationship on two mutually opposite walls of the vat, and the upper portion of the vat is provided with a gutter-shaped powder-sucking channel preventing overflow losses, the said gutter-shaped channel being associated with a sucking and recovering device.
  • the latter is advantageously provided with an additional, inclined and porous bottom-wall, through which is blown a flow of conveying fluid forming a fluidified bottom, which flows into a channel arranged lower and in which the powder is fluidified and driven towards the said spraying pipes by means of directed injections of conveying fluid into supply ducts provided with Venturi devices or the like.
  • the device of the invention Owing to the device of the invention, the construction of which is simple, it is possible to treat intermittently (or continuously if desired) a great variety of articles of any shape, without any loss of powder and under altogether satisfactory conditions as to the re sults obtained and the hygiene conditions during work. Indeed, whether the vat device is used or not, there is never any loss of powder nor any efflux from the vat. Since the latter is open at its top, the articles to be treated can be simply introduced into the vat and withdrawn therefrom when suitably coated.
  • a plant according to the invention is formed of a vat device for the treatment of articles in a fluidified medium, comprising an open-top vat l substantially in the shape of a right-angled parallelepiped having four lateral faces 2, 3, 4 and 5 and a bottom 6.
  • Two spraying pipes 7, 8 are provided in the top of the vat in proximity to, respectively, the walls 4 and 2. The pipes 7 and 8 eject the fluidified powder into the vat as diagrammatized in the drawing.
  • a reservoir containing the powder 10 to be sprayed feeds a fluidification channel 11 in which the powder is fluidified by means of an injection of a conveying fluid, such as air, supplied at 12 under a porous wall 13 forming an additional bottom wall of the channel 11.
  • a conveying fluid such as air
  • the powder thus suspended in the channel 11 is sucked into the spraying-pipe supply ducts l4 and 17, by means of air injections into the ducts 16, 17 arranged in coaxial relationship to the ducts l4, 15, according to the well-known Venturi principle.
  • Secondary air may also be supplied through ducts 18, 19 at the inlet of the spraying pipes 7, 8, so as to permit a more accurate regulation of the flow and density of the fluidified bed formed in the vat 1.
  • each spraying pipe is supplied through two successive Venturi devices such as 32, 33 fed with conveying air through the conduits 17, 19.
  • the spraying pipes 7, 8 may be of any known type, for instance of the type provided with orifices, etc
  • the latter is advantageously provided with an additional, porous bottom-wall 20 inclined towards the channel 11, a flow of conveying air being injected between the vat bottom 6 and the wall 20.
  • a fluidified bed is thus maintained at the bottom of the vat, so that the powder moving down by gravity from the spraying pipes 7, 8 forms in the vat a fluidified bed, the lower layer of which flows towards the channel ll as shown by the arrows 21.
  • the bottom 20 thus forms an aeroslide for the powder. lt also forms a protecting grate stopping any object having casually fallen into the vat.
  • the latter In order to prevent powder overflows from the vat 1, the latter is provided at its top with a gutter-shaped channel 22 arranged all around the vat and provided with an opening or slit 23 opening into the interior of the vat.
  • a negative pressure is created in the channel 22 by means of a sucking device 24 connected to the channel 22 through a duct 25.
  • the powder sucked into the channel 22 by the device 24 is recovered at 26 in a filter, or it may be conveyed back into the vat 1 through a duct 27, after being, if desired, freed from dust.
  • the spraying pipes are so designed as to admit a uniform flow of powder distributed equally over the whole length. They are provided with an electrostatic charge electrode 31 connected to a high-voltage generator 30.
  • the powder sprayed by the pipes 7, 8 forms a screen of electrostatically charged powder through which passes the articles 28 to be coated, the latter being connected to earth through the medium of a holder system, a handling means or a rod 29.
  • the articles 28 may also be heated, so that the powder may adhere thereto spontaneously.
  • a vibrating sieve-grate may advantageously be provided on the upper beam of the channel 11.
  • sucking slit 23 of the gutter-shaped channel 22 may be arranged lower than the location shown in the drawing, for instance below the spraying pipes 7, 8, so that a negative pressure may be created in the whole of the vat.
  • the bottom of the vat may also be constituted by one or several inclined metal sheets to which vibrations are imparted to ensure the flowing of the powder towards the channel 11.
  • Vat device for surface treatment of articles in a fluidized medium comprising a container having at least one horizontal spray pipe adjacent the upper end portion of the container and in proximity to a side wall thereof, said container being formed at its bottom portion with a channel, means for supplying powder to said channel, fluid supply means for supplying a fluid within said channel to fluidize said powder therein, conduit means interconnecting said spray device with said channel, and drive means cooperating with said conduit means for driving said fluidized powder from said channel to said spray pipe through said conduit means.
  • a device comprising a powder reservoir from which the powder falls into the said channel.
  • a device according to claim l wherein said drive means comprises a source of air injected into supply ducts, said air by Venturi effect driving said fluidized powder to said spray pipe.
  • a device wherein said container is substantially in the shape of a right-angled parallelpiped structure, two spray pipes being provided in substantially confronting relation, each being disposed adjacent a side wall of the container.
  • a device comprising a gutter-shaped powder-sucking channel at the upper bounds of the container which is open for preventing overflow, suction means for removing excess powder through said sucking channel, and a recovering device connected to said suction means for recovering said excess powder.
  • Treatment vat device according to claim 6, wherein the said gutter-shaped channel is provided in the upper portion of the vat.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
  • Coating Apparatus (AREA)
  • Glanulating (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
US00192623A 1970-10-27 1971-10-26 Vat device for the treatment of articles in a fluidified medium Expired - Lifetime US3799112A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7038745A FR2110699A5 (it) 1970-10-27 1970-10-27

Publications (1)

Publication Number Publication Date
US3799112A true US3799112A (en) 1974-03-26

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Family Applications (1)

Application Number Title Priority Date Filing Date
US00192623A Expired - Lifetime US3799112A (en) 1970-10-27 1971-10-26 Vat device for the treatment of articles in a fluidified medium

Country Status (7)

Country Link
US (1) US3799112A (it)
JP (1) JPS5153267Y2 (it)
BE (1) BE774388A (it)
DE (1) DE7140137U (it)
FR (1) FR2110699A5 (it)
GB (1) GB1344113A (it)
IT (1) IT940052B (it)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3921576A (en) * 1973-12-07 1975-11-25 Charles R Vertue Spray booth
US3937179A (en) * 1972-05-18 1976-02-10 Electrostatic Equipment Corporation Particle cloud coating method and apparatus
US3951099A (en) * 1974-04-11 1976-04-20 Electrostatic Equipment Corporation Automatic feed fluidized bed system
US4053661A (en) * 1974-03-25 1977-10-11 Electrostatic Equipment Corporation Particle cloud coating method and apparatus
US4101687A (en) * 1973-09-18 1978-07-18 Electrostatic Equipment Corporation Electrostatic coating method
US4338878A (en) * 1980-11-26 1982-07-13 United Technologies Corporation Fluidized bed with sloped aperture plate
US4950497A (en) * 1989-06-15 1990-08-21 S.L. Electrostatic Technology, Inc. Method and apparatus for coating interior surfaces of objects
US5041301A (en) * 1989-06-15 1991-08-20 S. L. Electrostatic Technology, Inc. Method and apparatus for coating interior surfaces of objects with abrasive materials
US5141767A (en) * 1991-01-15 1992-08-25 Northern Telecom Limited Method for providing a measure of tackiness of a body surface
US5242718A (en) * 1987-06-15 1993-09-07 Electrostatic Technology, Inc. Coating apparatus and method with fluidized bed feed effect

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4008685A (en) * 1976-04-20 1977-02-22 Westinghouse Electric Corporation Electrostatic fluidized bed build control
JPS53165707U (it) * 1977-05-31 1978-12-26

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1769397A (en) * 1928-11-21 1930-07-01 Erve C Strickland Clothes-starching machine
US2768903A (en) * 1953-06-18 1956-10-30 Otto W Schick Method and apparatus for applying flocking to an article
US2818043A (en) * 1954-03-18 1957-12-31 Powers Chemco Inc Photoengraver's powdering cabinet
US3439649A (en) * 1965-03-15 1969-04-22 Ransburg Electro Coating Corp Electrostatic coating apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1769397A (en) * 1928-11-21 1930-07-01 Erve C Strickland Clothes-starching machine
US2768903A (en) * 1953-06-18 1956-10-30 Otto W Schick Method and apparatus for applying flocking to an article
US2818043A (en) * 1954-03-18 1957-12-31 Powers Chemco Inc Photoengraver's powdering cabinet
US3439649A (en) * 1965-03-15 1969-04-22 Ransburg Electro Coating Corp Electrostatic coating apparatus

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3937179A (en) * 1972-05-18 1976-02-10 Electrostatic Equipment Corporation Particle cloud coating method and apparatus
US4101687A (en) * 1973-09-18 1978-07-18 Electrostatic Equipment Corporation Electrostatic coating method
US3921576A (en) * 1973-12-07 1975-11-25 Charles R Vertue Spray booth
US4053661A (en) * 1974-03-25 1977-10-11 Electrostatic Equipment Corporation Particle cloud coating method and apparatus
US3951099A (en) * 1974-04-11 1976-04-20 Electrostatic Equipment Corporation Automatic feed fluidized bed system
US4338878A (en) * 1980-11-26 1982-07-13 United Technologies Corporation Fluidized bed with sloped aperture plate
US5242718A (en) * 1987-06-15 1993-09-07 Electrostatic Technology, Inc. Coating apparatus and method with fluidized bed feed effect
US4950497A (en) * 1989-06-15 1990-08-21 S.L. Electrostatic Technology, Inc. Method and apparatus for coating interior surfaces of objects
US5041301A (en) * 1989-06-15 1991-08-20 S. L. Electrostatic Technology, Inc. Method and apparatus for coating interior surfaces of objects with abrasive materials
US5141767A (en) * 1991-01-15 1992-08-25 Northern Telecom Limited Method for providing a measure of tackiness of a body surface

Also Published As

Publication number Publication date
DE7140137U (de) 1972-01-27
JPS47463U (it) 1972-08-02
JPS5153267Y2 (it) 1976-12-20
FR2110699A5 (it) 1972-06-02
GB1344113A (en) 1974-01-16
IT940052B (it) 1973-02-10
BE774388A (fr) 1972-02-14

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