EP0042111B1 - Procédé et dispositif de poudrage électrostatique d'objets en plusieurs couches différentes - Google Patents

Procédé et dispositif de poudrage électrostatique d'objets en plusieurs couches différentes Download PDF

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Publication number
EP0042111B1
EP0042111B1 EP81104290A EP81104290A EP0042111B1 EP 0042111 B1 EP0042111 B1 EP 0042111B1 EP 81104290 A EP81104290 A EP 81104290A EP 81104290 A EP81104290 A EP 81104290A EP 0042111 B1 EP0042111 B1 EP 0042111B1
Authority
EP
European Patent Office
Prior art keywords
powder
zone
booth
spraying
ionization
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
Application number
EP81104290A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0042111A1 (fr
Inventor
Alain Gernez
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.)
Compagnie Europeenne pour lEquipement Menager SA
Original Assignee
Compagnie Europeenne pour lEquipement Menager 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 Compagnie Europeenne pour lEquipement Menager SA filed Critical Compagnie Europeenne pour lEquipement Menager SA
Publication of EP0042111A1 publication Critical patent/EP0042111A1/fr
Application granted granted Critical
Publication of EP0042111B1 publication Critical patent/EP0042111B1/fr
Expired 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
    • 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
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B16/00—Spray booths
    • B05B16/20—Arrangements for spraying in combination with other operations, e.g. drying; Arrangements enabling a combination of spraying operations
    • 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
    • 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
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/50—Multilayers
    • B05D7/52—Two layers
    • B05D7/54—No clear coat specified
    • 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
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2451/00—Type of carrier, type of coating (Multilayers)

Definitions

  • the invention relates to a method and a device for electrostatic powdering of objects moving continuously by means of a conveyor through at least two treatment booths, in particular in the booths described in document NL-A-79 08 458.
  • These cabins each include a spray module and two air filtration modules located on either side of the spray module with, between each of these three modules, a compartment allowing the ionization of the powder.
  • the present invention aims to overcome these drawbacks and complications by presenting a method and a device of high reliability and low cost of realization, in particular by avoiding all mechanical equipment which increases the maintenance costs.
  • the subject of the invention is a method of electrostatic powdering of objects moving continuously, by means of a conveyor, through at least two treatment booths, in which in the first booth is deposited a thin layer, called layer of bottom or mass, and in the next cabin a thicker layer, called presentation layer, characterized in that said objects pass successively, in the first cabin, an ionization enclosure, a powder dispersion enclosure without electrostatic charging therefrom, a second ionization enclosure, the powder deposition intervening mainly in the ionization enclosures situated on either side of the dispersion enclosure and not in the dispersion enclosure, then, in the second cabin, an ionization enclosure and an electrostatic spray enclosure, the deposition of powder in the second cabin intervening in these two enclosures.
  • the invention also relates to an electrostatic powdering device for objects moving continuously by means of a conveyor through at least two treatment booths each comprising a powder spraying module framed by air filtration modules. , characterized in that the spray module of the first cabin comprises a non-electrostatic spray chamber disposed between two ionization compartments, and that the spray module of the cabin following the first cabin comprises an electrostatic spray chamber preceded by an ionization compartment.
  • Module A serves as an entry airlock
  • module B is the spray enclosure intended for depositing powder and contains projection elements 22 (FIG. 2)
  • module C is the exit airlock.
  • the module B2 is divided by a partition 48 into two spray compartments B2-1 and B2-2.
  • the module B1 differs from the module B2 only in the absence of this partition.
  • the input-output modules A and C contain vertical cylindrical filters 5, for example four in number per module.
  • a fan 8 allows the suction through the filters and a cleaning unit (not shown) ensures the regeneration of the filters.
  • a fluidization element 3 located at the base of the filters makes it possible to recover the powder which falls from these filters and to return it to a powder reserve 11, 12 situated at the base of the compartments B2-1, B2-2 of the cabin. These contain a fluidization unit 9.
  • the powder deposition elements 22 are of any type, for example spray guns, electrostatic or not.
  • the powder deposition elements 22 are connected to plungers 10 which draw the powder directly from one of the powder reserve tanks 11, 12, a tank for each spraying compartment.
  • the elements 22 are capped with a cover preventing the accumulation of powder thereon.
  • Each spraying module B1, B2 has two ionizing compartments E, F adjacent to the spraying chamber and to the inlet and outlet modules A, C.
  • the powder In the first cabin, the powder is first dispersed in a first enclosure B1 and then electrostatically charged in two contiguous enclosures E and F located upstream and downstream. In the second cabin, powder is pre-applied only by electrostatic forces in compartment E before entering the spraying enclosure B2.
  • An ionizer compartment consists of solid walls 13, 14, 15, 16 leaving a central passage 17 for the parts to be treated. These walls have the effect of constituting obstacles on the path of the powder and thereby further confine the powder in the powdering module B by creating a significant pressure drop during the passage from the powdering chamber B to the chamber. A or C filtration. These obstacles force the powder participating in this transfer to go towards the central axis of the cabin and thereby towards the parts which circulate in the cabin. The fraction of powder still loaded is redeposited on the parts.
  • the ionizing compartments E and F further comprise ionizing elements 21, 23, 25, 27 constituted by insulating tubes arranged vertically in the cabin.
  • These tubes are pierced with holes crossed by spikes 29 so as to leave a space between the spike and the hole.
  • the points are fixed in the wall of the tube opposite the hole according to a generatrix by a fixing means, such as nailing or the like.
  • the tips 29 are directed towards the center of the cabin, perpendicular to the axis of transfer of the parts and pass through a conductive element placed inside the tube and connected to the high voltage.
  • the high voltage source is an electrostatic generator which may be the same as that used for the spray guns in module B; the tips 29 are thus in contact with the conductive element which brings them to a high potential for achieving the ionization of the powder.
  • the conductive element is constituted by a helical spring suspended in the axis of the tube, between the turns from which the tips 29 have passed.
  • the conductive element could be constituted by a metallic braid.
  • the tips are arranged along a generator over the entire height of the tube; one can space, for example, the points of a distance ranging between 10 mm and 100 mm.
  • the insulating tube 21 is closed at one end by an insulating plug through which the high-voltage current supply conductor passes so as to avoid electrostatic leaks: its other end is connected to a supply of compressed air.
  • the tips are brought to a high electrical potential via the conductive element so as to create an ionization of the powder, and the compressed area is sent into the tube.
  • This air, exiting through the holes surrounding the tips, has the effect of preventing powder deposits on the tips, which would harm good ionization of the area and of the powder present in the compartment.
  • a sieve shaker is placed in each ionizer compartment E, F, at the bottom of these compartments, preferably of the type shown in FIGS. 4 and 5; the sieve shaker comprises a wire mesh 34 bonded to a metal frame 35 subjected to vibrations generated by a pneumatic vibrator 37 via a bracket 36.
  • the flexible suspension of the sieve shaker is provided by two rubber bands 38 and 39 which also provide the powder overflow. These bands are fixed on brackets 40, 41, 42 and 43 which can slide longitudinally in two sections 44 and 45 which avoid the retention of powder. This makes it possible to remove the sieves from the cabin for cleaning, by simple lateral extraction by means of two doors drilled in module B.
  • the separation of the metallic particles and the transport of powder to the reservoir tanks 11, 12 constituting the bottom of module B are provided by an inclined sheet 46 subjected to the vibrations of the sieve shaker and provided with parallel strips of magnetic rubber 47 bonded to the sheet. These strips 47 are separated by intervals 48 which allow the accumulation of magnetic particles between two cleanings.
  • the embodiment of the sieve machine according to FIG. 5 ensures a high efficiency of sieving and separation of the metallic particles from the powder.
  • the cabin has two completely independent air filtration compartments A and C. This makes it possible to treat separately and without mixing the powder polluted by any dropouts in the bottom powder (module A2 inlet) and clean powder (module C2 outlet).
  • the cabin having a spraying chamber and a powder reservoir bin separated into two equal or unequal parts B2-1, B2-2, by a wall 48 situated in a plane perpendicular to the axis of advance of the parts, this allows the base powder, detached from the part, preferably falls into the container adjacent to the inlet.
  • the sieving of the powder from the input-output modules by two sieves also ensuring the separation of the magnetic particles allows the polluted powder from the input module not to mix with the clean powder from the output module.
  • the magnetic particle separation device also ensures the lateral transfer of the powder between the sieve shaker and the powder half-tank corresponding to the latter.
  • FIG. 4 represents a variant in which the second cabin comprises a powder ionizer compartment D formed between the two spray half-chambers B2-1 and B2-2 by means of two walls 51, 52 so as to further reduce the exchanges of powder between the half spray chambers.
  • Compartment D comprises two ionizing tubes 49 and 50, the ionizing tips of which are directed towards the axis of travel of the parts to be treated.
  • the whole of this process and device can in particular be used for the application of powder enamel according to the "two-layer-one baking" process on ordinary steel sheet instead of decarburized sheet in the case of the application of 'direct' presentation enamel.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Electrostatic Spraying Apparatus (AREA)
EP81104290A 1980-06-13 1981-06-04 Procédé et dispositif de poudrage électrostatique d'objets en plusieurs couches différentes Expired EP0042111B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8013161A FR2484291A1 (fr) 1980-06-13 1980-06-13 Procede et dispositif de poudrage electrostatique d'objets en plusieurs couches differentes
FR8013161 1980-06-13

Publications (2)

Publication Number Publication Date
EP0042111A1 EP0042111A1 (fr) 1981-12-23
EP0042111B1 true EP0042111B1 (fr) 1984-11-14

Family

ID=9243064

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81104290A Expired EP0042111B1 (fr) 1980-06-13 1981-06-04 Procédé et dispositif de poudrage électrostatique d'objets en plusieurs couches différentes

Country Status (12)

Country Link
US (2) US4376136A (es)
EP (1) EP0042111B1 (es)
JP (1) JPS5727174A (es)
AR (1) AR226730A1 (es)
BR (1) BR8103756A (es)
DE (1) DE3167167D1 (es)
ES (1) ES502998A0 (es)
FR (1) FR2484291A1 (es)
GR (1) GR74934B (es)
NO (1) NO811974L (es)
SU (1) SU1120919A3 (es)
YU (1) YU137381A (es)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4723505A (en) * 1986-03-17 1988-02-09 Nordson Corporation Powder booth
US4704953A (en) * 1986-11-12 1987-11-10 Nordson Corporation Powder spray system
EP0439670A1 (de) * 1989-12-23 1991-08-07 Columbus System Patent Ag Verfahren zur Vorbehandlung von Blech
DE4013063C1 (es) * 1990-04-24 1992-01-02 Metri Airfluid Ag, Altstaetten, Ch
US5454872A (en) * 1993-07-28 1995-10-03 Nordson Corporation System for controlling and utilizing finer powder particles in a powder coating operation
DE4447818C2 (de) * 1994-12-22 2003-11-06 Eisenmann Kg Maschbau Verfahren zur Pulverbeschichtung und Lackieranlage zur Durchführung des Verfahrens
US5891524A (en) * 1995-05-25 1999-04-06 American Standard Inc. Overspray recycling process
US7017208B2 (en) * 1995-08-04 2006-03-28 Hill-Rom Services, Inc. Hospital bed
US6099898A (en) * 1998-03-20 2000-08-08 Haden, Inc. Method for applying powder paint
US6968637B1 (en) * 2002-03-06 2005-11-29 Nike, Inc. Sole-mounted footwear stability system
US20080191378A1 (en) * 2007-02-14 2008-08-14 Brian Paul Microsphere reinforcement of composite materials

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1735494A (en) * 1925-02-12 1929-11-12 Chapman Electric Neutralizer C Neutralizer bar
US2795512A (en) * 1953-08-28 1957-06-11 Gen Electric Electrostatic method and apparatus for lining molds
FR1337469A (fr) * 1962-08-03 1963-09-13 Sames Mach Electrostat Dispositif automatique de poudrage en cabine, ou enceinte fermée
FR1532144A (fr) * 1966-07-29 1968-07-05 Sfb Spezial Filterbau M Ofner Procédé et dispositif pour l'enduction électrostatique superficielle avec des matières pulvérulentes
GB1413964A (en) * 1972-01-24 1975-11-12 Volstatic Coatings Ltd Electrostatic coating
FR2182403A5 (es) * 1972-04-27 1973-12-07 Air Ind
FR2300625A1 (fr) * 1975-02-13 1976-09-10 Air Ind Installation de poudrage electrostatique
FR2360356A1 (fr) * 1975-11-24 1978-03-03 Air Ind Procede et installation de poudrage electrostatique
FR2332809A1 (fr) * 1975-11-26 1977-06-24 Air Ind Procede et installation de poudrage electrostatique
FR2358933A1 (fr) * 1976-07-23 1978-02-17 Air Ind Procede et installation de poudrage electrostatique
GB1530508A (en) * 1976-05-27 1978-11-01 Volstatic Coatings Ltd Electrostatic coating equipment
FR2442080A1 (fr) * 1978-11-21 1980-06-20 Europ Equip Menager Installation de poudrage electrostatique d'objets
FR2467022A2 (fr) * 1978-11-21 1981-04-17 Europ Equip Menager Installation de poudrage electrostatique d'objets

Also Published As

Publication number Publication date
YU137381A (en) 1983-10-31
ES8203649A1 (es) 1982-04-01
ES502998A0 (es) 1982-04-01
FR2484291B1 (es) 1984-11-16
FR2484291A1 (fr) 1981-12-18
JPS5727174A (en) 1982-02-13
NO811974L (no) 1981-12-14
US4376136A (en) 1983-03-08
AR226730A1 (es) 1982-08-13
SU1120919A3 (ru) 1984-10-23
EP0042111A1 (fr) 1981-12-23
DE3167167D1 (en) 1984-12-20
US4454832A (en) 1984-06-19
BR8103756A (pt) 1982-03-02
GR74934B (es) 1984-07-12

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