US3695909A - Method for electrostatic coating of objects with a powder coating material - Google Patents

Method for electrostatic coating of objects with a powder coating material Download PDF

Info

Publication number
US3695909A
US3695909A US37971A US3695909DA US3695909A US 3695909 A US3695909 A US 3695909A US 37971 A US37971 A US 37971A US 3695909D A US3695909D A US 3695909DA US 3695909 A US3695909 A US 3695909A
Authority
US
United States
Prior art keywords
objects
coating
powder
coated
electrostatic
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
US37971A
Other languages
English (en)
Inventor
Pierre Fabre
Robert Giroud-Garampon
Michel Gondrand
Fernand Raymond
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.)
Tunzini Ameliorair SA
Original Assignee
Tunzini Ameliorair SA
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 Tunzini Ameliorair SA filed Critical Tunzini Ameliorair SA
Application granted granted Critical
Publication of US3695909A publication Critical patent/US3695909A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/16—Arrangements for controlling delivery; Arrangements for controlling the spray area for controlling the spray area
    • B05B12/18—Arrangements for controlling delivery; Arrangements for controlling the spray area for controlling the spray area using fluids, e.g. gas streams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B16/00—Spray booths
    • B05B16/90—Spray booths comprising conveying means for moving objects or other work to be sprayed in and out of the booth, e.g. through the booth
    • B05B16/95—Spray booths comprising conveying means for moving objects or other work to be sprayed in and out of the booth, e.g. through the booth the objects or other work to be sprayed lying on, or being held above the conveying means, i.e. not hanging from the conveying means
    • 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
    • B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
    • B05D1/04—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field
    • B05D1/06—Applying particulate materials
    • 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
    • B05D1/32—Processes for applying liquids or other fluent materials using means for protecting parts of a surface not to be coated, e.g. using stencils, resists
    • 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

  • the present invention relates to a method and apparatus for the partial surface coating of objects moving past an electrostatic coating station, and more particularly a powder coating station producing a cloud of electrified powder particles.
  • Apparatus of this type is presently used in order to obtain the coating of objects with a powder which is then melted or fused, so as to form a continuous film and to ensure a uniform protective or decorative coating.
  • the coating does not extend onto these electric conductors, or at least extends only partially thereon so as not to prevent a good connection contact.
  • the present invention aims to reduce or overcome these drawbacks and provides a method and apparatus wherein the partial superficial coating of objects passing a coating station is ensured in a particularly clean manner, without any depositing of particles on the portions of the objects which are not to be coated thereon.
  • the method according to the invention is characterised in that at least one elongated zone is created under slight pneumatic over-pressure and free from any particles, the said zone extending through and across the said cloud of particles, and a portion not to be covered of each object is constantly within the zone under slight over-pressure.
  • Apparatus using this method and applied to objects being carried on a conveyor comprises, at the location of the electrostatic coating station, at least one elongated enclosure for a zone under slight over-pressure, having at least one longitudinal opening parallel to the direction of displacement of the conveyor. '][n this way, the portions not to be coated of the objects travelling past the coating station are located through the opening or openings, whilst the portions to be coated pass through the zone subjected to the effect of the electrostatic powder.
  • FIG. 1 is a perspective view, having portions broken away, of one embodiment of coating apparatus according to the invention
  • FIG. 2 is a transverse section. through the apparatus of FIG. 1;
  • FIG. 3 is a partial sectional view of a further embodiment of apparatus according to the invention.
  • FIG. 4 is a partial sectional view of yet another embodiment of apparatus according to the invention.
  • the coating apparatus comprises a fiuidisation tank 1, formed in a manner known per se, having a porous bottom 2, associated with electrification means 3, and an intake 4 for fluidisation air.
  • the powder which is deposited above the porous bottom is fluidised within a chamber 5, and is attracted towards the objects to be coated, which are maintained at earth potential, by the effect of the electric field.
  • the apparatus also comprises two elongated boxes forming longitudinal enclosures 6 and 7, each formed from a member 8 of parallelepipedal form having a narrow opening 9 extending from end to end, according to the direction of displacement of a conveyor.
  • Each of the enclosures 6 and 7 is connected to at least one air inlet pipe 10 which slight- 1y over-pressurizes the enclosures 6 and 7.
  • the objects 11 to be coated are shown herein as resistors, capacitors or other electronic components, and comprises a body 12 and lateral conductors 13 and 14. These components are attached, at the ends of the conductors 13 and 14, to lateral bands 15, 16 forming conveyor belts, and during their passage across the coating station, these conductors 13 and 14 rest on the lower edge 17 defining the lower longitudinal portion of each opening 9.
  • input and. output screens 18 and 19 are positioned on the chamber 5, the boxes 8 forming the pressurised enclosures extending on both sides of the fluidisation chamber beyond its input and output screens.
  • FIG. 3 there is shown a pneumatic and electrostatic spray nozzle 20 of a type known per se, which sprays a current of air 21 transporting particles of powder in the direction of the electronic components 22 whose conductors 23 and 24 are inserted into pressurized enclosures 25, 26, which are supported by pillars 27 and 28.
  • the lower edge 29 of the openings is recessed so that the openings do not face the powder station, but in a direction such that the path of the particles towards an enclosure follows a meandering course terminating in an upward direction, which is advantageous.
  • An aspirator 30 is located below the sprayed cloud and allows recovery of the particles not deposited.
  • each enclosure 41 under slight over-pressure is formed at the side of the coating sation above and below by double walls 43 and 44 thereby defining two flat conduits 45 and 46 discharging at the location of the opening 47, these conduits communicating with narrow chambers 48 and 49.
  • the chamber 48 is under pressure whilst the chamber 49 is kept at subatmospheric pressure by means of an air supplying duct 51 and an air extracting duct 52 respectively, so that an extended jet of air is issued from the conduit 45 across the opening 47 and is collected by the conduit 46.
  • a curtain of air is thus formed, as shown by the arrows 1, very clearly separating the area of the enclosure under slight over-pressure from the outer space wherein the cloud of electrified powder particles is located.
  • one or more vibrators 50 are arranged on the enclosure 41, and preferably adjacent each upper wall defining the opening, which prevents the powder from collecting on these walls.
  • the invention applies to the coating of objects not only by electrostatic powdering but also by electrostatic paintmg.
  • Method of continuously applying a partial surface coating to objects by passing said objects through a cloud of electrified particles of a coating product comprises the steps of maintaining at least one elongated zone adjacent said cloud under a gaseous pressure higher than that prevailing within said cloud and free of any particles, the said zone extending in the direction of displacement of the objects to be coated, and passing said objects through said cloud with a portion of said objects not to be coated within said zone under higher pressure.
  • Method as claimed in claim 1 which comprises the step of establishing a curtain of air extending laterally of said zone in said direction of displacement, which curtain separates said zone from said cloud substantially at the region of separation between the portion of said objects to be coated and the portion which is to remain uncoated.
  • Method as claimed in claim 1 which comprises the step of maintaining said zone within an elongated enclosure having a longitudinal opening extending in said direction of displacement, through which opening the portions of said objects to remain uncoated project into said zone.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Details Or Accessories Of Spraying Plant Or Apparatus (AREA)
US37971A 1969-05-23 1970-05-18 Method for electrostatic coating of objects with a powder coating material Expired - Lifetime US3695909A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR6916009A FR2044908A5 (de) 1969-05-23 1969-05-23

Publications (1)

Publication Number Publication Date
US3695909A true US3695909A (en) 1972-10-03

Family

ID=9034186

Family Applications (1)

Application Number Title Priority Date Filing Date
US37971A Expired - Lifetime US3695909A (en) 1969-05-23 1970-05-18 Method for electrostatic coating of objects with a powder coating material

Country Status (7)

Country Link
US (1) US3695909A (de)
JP (1) JPS4824806B1 (de)
BE (1) BE750809A (de)
DE (1) DE2025082A1 (de)
FR (1) FR2044908A5 (de)
GB (1) GB1259246A (de)
NL (1) NL148813B (de)

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1535245B1 (de) * 1964-04-03 1970-08-20 Sulzer Ag Schaftmaschine fuer Webmaschinen
US3817211A (en) * 1972-02-22 1974-06-18 Owens Corning Fiberglass Corp Apparatus for impregnating strands, webs, fabrics and the like
US3828729A (en) * 1972-05-18 1974-08-13 Electrostatic Equip Corp Electrostatic fluidized bed
US3865610A (en) * 1972-05-24 1975-02-11 Electrostatic Equip Corp Coating method with precure and apparatus therefor
US3874333A (en) * 1972-09-28 1975-04-01 Nat Steel Corp Preventing edge wrap-around in one-side electrostatic coating
US3901185A (en) * 1972-05-24 1975-08-26 Electrostatic Equip Corp Coating method with precure and apparatus therefor
US3914461A (en) * 1972-05-18 1975-10-21 Electrostatic Equip Corp Electrostatic coating method
US3919437A (en) * 1972-02-22 1975-11-11 Owens Corning Fiberglass Corp Method for electrostatically impregnating strand
US3937179A (en) * 1972-05-18 1976-02-10 Electrostatic Equipment Corporation Particle cloud coating method and apparatus
US4002144A (en) * 1974-07-17 1977-01-11 Ato Chimie Installation for coating substantially U-shaped or V-shaped articles
US4011832A (en) * 1975-02-26 1977-03-15 Westinghouse Electric Corporation Build control for fluidized bed wire coating
US4035521A (en) * 1975-02-26 1977-07-12 Westinghouse Electric Corporation Build control for fluidized bed wire coating
US4053661A (en) * 1974-03-25 1977-10-11 Electrostatic Equipment Corporation Particle cloud coating method and apparatus
US4472451A (en) * 1983-01-21 1984-09-18 Nordson Corporation Mold masking apparatus and method
US5044312A (en) * 1989-11-07 1991-09-03 Hughes Aircraft Company Conformal coat contact insertion strip mask
US5417830A (en) * 1992-12-02 1995-05-23 Kabushiki Kaisha Toshiba Injection plating apparatus
US6397840B1 (en) * 1998-11-05 2002-06-04 Delsys Pharmaceutical Corporation Dry powder dispensing device
US9162245B1 (en) * 2012-03-29 2015-10-20 BTD Wood Powder Coating, Inc. Powder coating conveyor support
WO2017055165A1 (de) * 2015-09-28 2017-04-06 Von Ardenne Gmbh Verfahren zur substratbeschichtung mit partikeln und vorrichtung zur ausführung des verfahrens

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS644272A (en) * 1987-06-24 1989-01-09 Hideo Nagasaka Electrostatic powder coating device
GB2260091A (en) * 1991-09-20 1993-04-07 Enco Ind Limited Spray painting using a mask and a shielding air flow

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1535245B1 (de) * 1964-04-03 1970-08-20 Sulzer Ag Schaftmaschine fuer Webmaschinen
US3817211A (en) * 1972-02-22 1974-06-18 Owens Corning Fiberglass Corp Apparatus for impregnating strands, webs, fabrics and the like
US3919437A (en) * 1972-02-22 1975-11-11 Owens Corning Fiberglass Corp Method for electrostatically impregnating strand
US3828729A (en) * 1972-05-18 1974-08-13 Electrostatic Equip Corp Electrostatic fluidized bed
US3914461A (en) * 1972-05-18 1975-10-21 Electrostatic Equip Corp Electrostatic coating method
US3937179A (en) * 1972-05-18 1976-02-10 Electrostatic Equipment Corporation Particle cloud coating method and apparatus
US3865610A (en) * 1972-05-24 1975-02-11 Electrostatic Equip Corp Coating method with precure and apparatus therefor
US3901185A (en) * 1972-05-24 1975-08-26 Electrostatic Equip Corp Coating method with precure and apparatus therefor
US3874333A (en) * 1972-09-28 1975-04-01 Nat Steel Corp Preventing edge wrap-around in one-side electrostatic coating
US4053661A (en) * 1974-03-25 1977-10-11 Electrostatic Equipment Corporation Particle cloud coating method and apparatus
US4002144A (en) * 1974-07-17 1977-01-11 Ato Chimie Installation for coating substantially U-shaped or V-shaped articles
US4011832A (en) * 1975-02-26 1977-03-15 Westinghouse Electric Corporation Build control for fluidized bed wire coating
US4035521A (en) * 1975-02-26 1977-07-12 Westinghouse Electric Corporation Build control for fluidized bed wire coating
US4472451A (en) * 1983-01-21 1984-09-18 Nordson Corporation Mold masking apparatus and method
US5044312A (en) * 1989-11-07 1991-09-03 Hughes Aircraft Company Conformal coat contact insertion strip mask
US5417830A (en) * 1992-12-02 1995-05-23 Kabushiki Kaisha Toshiba Injection plating apparatus
US6397840B1 (en) * 1998-11-05 2002-06-04 Delsys Pharmaceutical Corporation Dry powder dispensing device
US9162245B1 (en) * 2012-03-29 2015-10-20 BTD Wood Powder Coating, Inc. Powder coating conveyor support
WO2017055165A1 (de) * 2015-09-28 2017-04-06 Von Ardenne Gmbh Verfahren zur substratbeschichtung mit partikeln und vorrichtung zur ausführung des verfahrens
KR20180050756A (ko) * 2015-09-28 2018-05-15 폰 아르덴네 아세트 게엠베하 운트 콤파니 카게 입자를 사용한 기판 코팅 방법 및 이 방법을 실행하기 위한 장치
KR101941830B1 (ko) 2015-09-28 2019-01-23 폰 아르덴네 아세트 게엠베하 운트 콤파니 카게 입자를 사용한 기판 코팅 방법 및 이 방법을 실행하기 위한 장치
JP2019502020A (ja) * 2015-09-28 2019-01-24 フォン アルデンヌ アセット ゲーエムベーハー ウント コー カーゲー 粒子で基板をコーティングする方法及び当該方法を実施するための装置
US10476084B2 (en) 2015-09-28 2019-11-12 VON ARDENNE Asset GmbH & Co. KG Method for substrate coating with particles and device for carrying out the method

Also Published As

Publication number Publication date
DE2025082A1 (de) 1970-12-17
GB1259246A (de) 1972-01-05
JPS4824806B1 (de) 1973-07-24
FR2044908A5 (de) 1971-02-26
NL148813B (nl) 1976-03-15
BE750809A (fr) 1970-11-03
NL7007425A (de) 1970-11-25

Similar Documents

Publication Publication Date Title
US3695909A (en) Method for electrostatic coating of objects with a powder coating material
US3809011A (en) Apparatus for the surface coating of objects
US4323030A (en) Spray coating device
EP0238238B1 (de) Pulversprühkabinen
US3921574A (en) Coating method with cleaning and apparatus therefor
GB1467299A (en) Process for forming multi-layer moulds
JPH0330851A (ja) 基板上に液状被覆を静電噴霧し乾燥させる方法および装置
US3799112A (en) Vat device for the treatment of articles in a fluidified medium
US2994618A (en) Method and apparatus for electrostatic coating
US3881653A (en) Powder deposition system
US2446953A (en) Apparatus for electrostatically coating articles
JPH01272190A (ja) プリント回路板の静電ラッカー塗布方法およびその実施のための装置
US2794751A (en) Electrostatic depositing method
US5773097A (en) Vertical electrostatic coater having vortex effect
SU1120919A3 (ru) Установка дл электростатического напылени покрытий на издели
US3620190A (en) Spraying apparatus
RU2060099C1 (ru) Способ непрерывного литья металла и машина для его осуществления
CA1065128A (en) Method of and apparatus for coating objects with powdered or granular particles, flakes or fibres
JPH03254879A (ja) 除水乾燥装置
US3329490A (en) Electrostatic deposition of parting materials in method of bending superposed glass sheets
US3970035A (en) Powder deposition system
GB1126620A (en) Improvements in or relating to methods and apparatus for applying powder coatings to articles
EP0220055B1 (de) System zum Beschichten einer Oberfläche
US4729340A (en) Method and apparatus for powder coating elongated objects
US2550657A (en) Electrostatic coating method and apparatus