EP0035246B1 - Verfahren und Vorrichtung zum Wiederionisieren isolierenden Pulvers in Anlagen zur elektrostatischen Pulverbeschichtung - Google Patents

Verfahren und Vorrichtung zum Wiederionisieren isolierenden Pulvers in Anlagen zur elektrostatischen Pulverbeschichtung Download PDF

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Publication number
EP0035246B1
EP0035246B1 EP81101408A EP81101408A EP0035246B1 EP 0035246 B1 EP0035246 B1 EP 0035246B1 EP 81101408 A EP81101408 A EP 81101408A EP 81101408 A EP81101408 A EP 81101408A EP 0035246 B1 EP0035246 B1 EP 0035246B1
Authority
EP
European Patent Office
Prior art keywords
powder
tube
pins
objects
insulating
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
EP81101408A
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English (en)
French (fr)
Other versions
EP0035246A1 (de
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 EP0035246A1 publication Critical patent/EP0035246A1/de
Application granted granted Critical
Publication of EP0035246B1 publication Critical patent/EP0035246B1/de
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
    • 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
    • B05B5/08—Plant for applying liquids or other fluent materials to objects
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B14/00—Arrangements for collecting, re-using or eliminating excess spraying material
    • B05B14/40—Arrangements for collecting, re-using or eliminating excess spraying material for use in spray booths
    • B05B14/42—Arrangements for collecting, re-using or eliminating excess spraying material for use in spray booths using electrostatic means

Definitions

  • the invention relates to a method and a device for reionizing insulating powder in an installation for electrostatic powdering of objects.
  • reionization is meant the fact of electrostatically charging a powder a second time which has already been powdered, for example by passing through the electrostatic spray guns.
  • the electrostatic application of powder of high electrical resistivity is carried out by projecting, in the direction of the part to be treated, a jet of powder electrified by charges produced by needles connected to a high continuous voltage generator.
  • the electrified powder adheres to the part by the effect of electrostatic forces.
  • the present invention aims to increase the proportion of powder deposited on the parts to be treated.
  • the subject of the invention is a device for reionizing insulating powder in an installation for electrostatic powdering of moving objects, comprising a spraying enclosure, installation in which the powder not deposited on the objects is sucked towards air filtering elements. , parallel to the axis of travel of the objects, characterized in that it comprises at least one element for reionization of the non-deposited powder, located in a reionization chamber contiguous to the spray enclosure, this chamber comprising walls intended directing the powder towards the objects to be treated, and being situated between the spraying enclosure and the air suction openings by the filter elements.
  • the subject of the invention is also a method of reionizing insulating powder in an installation for electrostatic powdering of moving objects, comprising a spraying enclosure, according to which the non-deposited powder is sucked outside the spraying enclosure.
  • a spraying enclosure parallel to the axis of movement of the objects, characterized in that it consists in having, on the path of the powder not deposited and sucked, walls intended to direct the powder towards the objects to be treated and to reionize between two successive walls powder not deposited and aspirated.
  • parts 1 placed on the conveyor 2 pass through a powder coating booth comprising three modules A, B, C: module A serves as an entry airlock, module B is the spray enclosure intended for deposition of powder and contains projection elements 22, and module C is the exit airlock.
  • the input and output modules A and C contain vertical cylindrical filters 5, for example four in number.
  • a fan 8 placed in a box 12 allows the suction of air 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 the filters and to return it to a powder reserve 11 situated in the module B of the cabin.
  • the latter contains a fluidization unit 9 and a sieve shaker 20.
  • the powder deposition elements 22 are of any type, for example electrostatic spray guns.
  • the powder deposition elements 22 are connected to injectors 28 which draw the powder directly by means of plungers 10 from the powder reserve 11.
  • Each input and output module A, C comprises a reionization compartment D, E contiguous to the central module B.
  • These reionization compartments could as well be arranged in the central module B.
  • a reionization 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 when passing from the powdering chamber B to the 'filtration chamber A, C. These obstacles force the powder which participates in this transfer to go towards the central axis 18 of the cabin according to the arrows f1, f2 and, thereby, towards the parts which circulate in the cabin.
  • the fraction of powder still loaded is redeposited on the parts.
  • the reionization compartments D, E further comprise ionizing elements 21, 23, 25, 27 constituted by insulating tubes arranged vertically over the entire height of the cabin. These tubes are pierced with holes 30 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 18 for transferring the parts and pass through a conductive element 31 connected at high voltage by a conductor 32.
  • 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 31 which bring them to a high potential for carrying out the reionization of the powder.
  • the conductive element 31 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 31 could also 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 and 100 mm.
  • the insulating tube 21 is closed at one end by an insulating plug 33, crossed by the supply conductor 32 of the high voltage current so as to avoid electrostatic leaks; its other end is connected to a compressed air supply 34.
  • the tips are brought to a high electrical potential via the spring 31 so as to create an ionization of the powder and the compressed air 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 adversely affect good ionization of the air and the powder present in the compartment.
  • the implementation of the invention improves the regularity of the thickness of powder on the parts. Lateral suction through the filters ensures the same powder density over the entire height of the cabin and, consequently, a regular deposition of powder on the parts.

Landscapes

  • Application Of Or Painting With Fluid Materials (AREA)
  • Electrostatic Spraying Apparatus (AREA)
  • Paints Or Removers (AREA)

Claims (12)

1. Vorrichtung zum Wiederionisieren von isolierendem Pulver in einer Einrichtung zum elektrostatischen Pulverbeschichten von vorbeigeführten Gegenständen, die einen Pulverisierbereich (B) aufweist, wobei in dieser Einrichtung das nicht auf den Gegenständen haftende Pulver zu Luftfilterelementen (5) parallel zur Fortbewegungsachse der Gegenstände angesaugt wird, dadurch gekennzeichnet, dass sie mindestens ein Wiederionisierelement (21 ) des nicht haftenden Pulvers aufweist, das sich in einer Wiederionisierkammer (D) befindet, die an den Pulverisierbereich (B) anschliesst, wobei diese Kammer Wände (13,14) aufweist, die dazu bestimmt sind, das Pulver auf die zu behandelden Gegenstände zu richten, und wobei sie zwischen dem Pulverisierbereich (B) und den Öffnungen zum Ansaugen der Luft durch Filterelemente (5) angeordnet ist.
2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass das Wiederionisierelement (21 ) ein Rohr aus Isoliermaterial mit Nadeln (29), die eine Wand des Rohrs durchdringen und auf der entgegengesetzten Innenwand befestigt sind, und ein Leitermittel (31) im Inneren des Rohrs aufweist, das die Nadeln auf ein hohes elektrisches Potential bringt.
3. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, dass das Leitermittel (31), das die Nadeln auf ein elektrisches Potential bringen soll, aus einer Spiralfeder besteht, die in der Achse des Rohrs angeordnet ist und deren Windungen mit den Nadeln in Kontakt stehen.
4. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, dass das Leitermittel, das die Nadeln auf ein elektrisches Potential bringt, aus einer Metallschnur besteht, die von den Nadeln (29) durchquert wird.
5. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, dass die auf der Innenwand eines Rohrs befestigten Nadeln durch die Mitte eines Lochs (30) verlaufen, das in die gegenüberliegende Isolierwand des Rohrs gebohrt ist, und rund um die Nadel eine Öffnung freilässt, die von einem Strom der aus dem Rohr kommenden Luft durchflossen wird.
6. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, dass die Nadeln (29) auf einer Mantellinie auf der ganzen Höhe des Rohrs angeordnet sind.
7. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, dass die Nadeln (29) auf einer Mantellinie des Rohrs in gleichmässigen gegenseitigen Abständen zwischen 10 und 100 mm angeordnet sind.
8. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, dass das Isolierrohr an einem Ende (33) verschlossen ist und an seinem anderen Ende mit einer Druckluftquelle (34) verbunden ist.
9. Vorrichtung nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass sie vier Wiedersionisierkammern aufweist, die auf beiden Seiten des Wegs der Gegenstände am Eingang und am Ausgang des Pulverisierbereichs (B) angeordnet sind.
10. Vorrichtung nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass der elektrostatische Generator, der das oder die Wiederionisierelemente speist, der gleiche ist wie der, der die Pulversprühpistolen versorgt.
11. Vorrichtung nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass mehrere Wiederionisierabteile hintereinander angeordnet sind.
12. Verfahren zum Wiederionisieren von isolierendem Pulver in einer Einrichtung zum elektrostatischen Beschichten von defilierenden Gegenständen, die einen Pulverisierbereich aufweist, gemäss dem das nicht verwendete Pulver parallel zur Fortbewegungsachse der Gegenstände aus dem Pulverisierbereich herausgesaugt wird, dadurch gekennzeichnet, dass es darin besteht, auf dem Weg des nicht anhaftenden und angesaugten Pulvers Wände anzuordnen, die das Pulver auf die zu behandelnden Gegenstände richten sollen, und zwischen zwei aufeinanderfolgenden Wänden das nicht verwendete und angesaugte Pulver wieder zu ionisieren.
EP81101408A 1980-03-05 1981-02-26 Verfahren und Vorrichtung zum Wiederionisieren isolierenden Pulvers in Anlagen zur elektrostatischen Pulverbeschichtung Expired EP0035246B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8004906A FR2477431A1 (fr) 1980-03-05 1980-03-05 Procede et dispositif de reionisation de poudre isolante dans une installation de poudrage electrostatique d'objets
FR8004906 1980-03-05

Publications (2)

Publication Number Publication Date
EP0035246A1 EP0035246A1 (de) 1981-09-09
EP0035246B1 true EP0035246B1 (de) 1983-11-23

Family

ID=9239328

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81101408A Expired EP0035246B1 (de) 1980-03-05 1981-02-26 Verfahren und Vorrichtung zum Wiederionisieren isolierenden Pulvers in Anlagen zur elektrostatischen Pulverbeschichtung

Country Status (12)

Country Link
US (1) US4385079A (de)
EP (1) EP0035246B1 (de)
JP (1) JPS56168852A (de)
AR (1) AR226346A1 (de)
BR (1) BR8101249A (de)
DE (1) DE3161466D1 (de)
ES (1) ES500063A0 (de)
FR (1) FR2477431A1 (de)
GR (1) GR74474B (de)
MX (1) MX150050A (de)
NO (1) NO810710L (de)
YU (1) YU54481A (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6358319B1 (en) 1999-11-30 2002-03-19 Owens Corning Fiberglass Technology, Inc. Magnetic method and apparatus for depositing granules onto an asphalt-coated sheet
DE10028553A1 (de) * 2000-06-09 2001-12-13 Itw Gema Ag Pulversprühbeschichtungskabine

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1413964A (en) * 1972-01-24 1975-11-12 Volstatic Coatings Ltd Electrostatic coating
FR2300625A1 (fr) * 1975-02-13 1976-09-10 Air Ind Installation de poudrage electrostatique
FR2333585A1 (fr) * 1975-09-30 1977-07-01 Brennenstuhl Kg Hugo Procede d'application sur des objets d'une couche de particules pulverulentes ou granuleuses, de flocs ou de fibres
GB1530508A (en) * 1976-05-27 1978-11-01 Volstatic Coatings Ltd Electrostatic coating equipment
FR2403117A1 (fr) * 1977-09-14 1979-04-13 Volstatic Holdings Ltd Dispositif pour le depot electrostatique de particules d'un materiau dielectrique de revetement
FR2442080A1 (fr) * 1978-11-21 1980-06-20 Europ Equip Menager Installation de poudrage electrostatique d'objets

Family Cites Families (3)

* 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
FR2182403A5 (de) * 1972-04-27 1973-12-07 Air Ind
DE2433789A1 (de) * 1974-07-13 1976-01-29 Bosch Gmbh Robert Kabine zur pulverbeschichtung

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1413964A (en) * 1972-01-24 1975-11-12 Volstatic Coatings Ltd Electrostatic coating
FR2300625A1 (fr) * 1975-02-13 1976-09-10 Air Ind Installation de poudrage electrostatique
FR2333585A1 (fr) * 1975-09-30 1977-07-01 Brennenstuhl Kg Hugo Procede d'application sur des objets d'une couche de particules pulverulentes ou granuleuses, de flocs ou de fibres
GB1530508A (en) * 1976-05-27 1978-11-01 Volstatic Coatings Ltd Electrostatic coating equipment
FR2403117A1 (fr) * 1977-09-14 1979-04-13 Volstatic Holdings Ltd Dispositif pour le depot electrostatique de particules d'un materiau dielectrique de revetement
FR2442080A1 (fr) * 1978-11-21 1980-06-20 Europ Equip Menager Installation de poudrage electrostatique d'objets

Also Published As

Publication number Publication date
MX150050A (es) 1984-03-05
NO810710L (no) 1981-09-07
JPS56168852A (en) 1981-12-25
ES8201444A1 (es) 1981-12-16
YU54481A (en) 1983-06-30
BR8101249A (pt) 1981-09-08
US4385079A (en) 1983-05-24
DE3161466D1 (en) 1983-12-29
GR74474B (de) 1984-06-28
FR2477431A1 (fr) 1981-09-11
EP0035246A1 (de) 1981-09-09
ES500063A0 (es) 1981-12-16
AR226346A1 (es) 1982-06-30
FR2477431B1 (de) 1984-09-28

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