EP0941145A1 - Pulversprüheinrichtung - Google Patents
PulversprüheinrichtungInfo
- Publication number
- EP0941145A1 EP0941145A1 EP96942367A EP96942367A EP0941145A1 EP 0941145 A1 EP0941145 A1 EP 0941145A1 EP 96942367 A EP96942367 A EP 96942367A EP 96942367 A EP96942367 A EP 96942367A EP 0941145 A1 EP0941145 A1 EP 0941145A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- powder
- spray device
- chamber
- earth electrode
- powder spray
- 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.)
- Granted
Links
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
- B05B5/025—Discharge apparatus, e.g. electrostatic spray guns
- B05B5/03—Discharge apparatus, e.g. electrostatic spray guns characterised by the use of gas, e.g. electrostatically assisted pneumatic spraying
- B05B5/032—Discharge apparatus, e.g. electrostatic spray guns characterised by the use of gas, e.g. electrostatically assisted pneumatic spraying for spraying particulate materials
Definitions
- the invention relates to a powder spray device for electrostatic powder coating according to the preamble of claim 1
- Such a powder spray device is known from DE 27 22 100 C2.
- the known device contains at least one chamber in which a tip discharge electrode opposite to the material current and a blunt counter electrode opposite to that which is poled are arranged upstream at a distance from the tip discharge electrode in order to improve the charging of the powder particles an embodiment with a plurality of chambers connected in series is also proposed. It is proposed to design the chamber in such a way that there are continuous expansions and constrictions which are intended to cause material particles to brake under turbulence and thus to be exposed to the force field more intensely To arrange circumferences of the at least one chamber distributed openings through which additional air is introduced, which reduce the average density of the mixture of air and powder and improve the charging
- the invention is therefore based on the object of specifying a powder spray device which leads to improved charging of the powder particles and thereby to an improved deposition rate
- One refinement relates to the arrangement of one or more external electrodes for further improving the charging or for field control and thus for increasing the efficiency
- Another embodiment relates to a variable design of the distance between the earth electrode and high-voltage electrodes, which allows an optimum to be set between good charging and disruptive effects such as jerk ionization
- FIG. 3 shows a schematic representation of a powder spray device with introduction of a
- FIG. 1 shows a powder spray device 10.
- a swirling chamber 1 is placed on a support element 6 of the powder spray device 10
- the cross-section of the chamber is larger than the cross-section of a supply line 11 for powder and air PL.
- the powder / air supply line 11 flows into the chamber 1 transversely to the main axis 12 of the chamber 1.
- the powder / air mixture PL can be sprayed in the opposite direction Spruh ⁇ chtung 13 (Fig 3) or be introduced transversely to the spray line 13.
- the spray line 13 is the main axis 12 in the direction of an outlet 3.
- the powder is charged by corona, which is generated on needle-shaped high-voltage electrodes 7, which are at high-voltage potential.
- the high voltage is generated with the aid of a high-voltage cascade 4, which is part of the powder spray device 10, and is supplied to the high-voltage needles via an electrical connection 22
- the high-voltage electrodes 7 are arranged in a ring in the area of the outlet 3 and form an intensive corona with the earth electrode 5. Due to the selected arrangement of the high-voltage needles, all powder particles are forced to move through an area with a high field strength and charge density. The internal charging thus caused can, if necessary, be additionally intensified by means of additional electrodes 8 which can be arranged in the area of the outlet 3 via external charging more or less wide, rotationally symmetrical powder cloud. Instead of the impact body 9, a slit-shaped flat nozzle 23 can also occur, which generates a flat powder jet
- FIG. 2 Such an alternative design of the outlet area is shown in FIG. 2.
- the other design of the powder spray device corresponds to that of FIG. 1, which will be described further below
- the needle-shaped high-voltage electrodes 7 are arranged in a ring in a front ring 2 distributed around the circumference.
- the outlet 3 is placed on the front ring 2.
- the chamber 1 is made of an insulating material, such as plastic, glass or ceramic.
- a chamber length of 7 to 15 cm, a diameter of 2 to 4 cm and a distance of 7 to 14 cm between the high-voltage electrodes 7 and a ground electrode 5 are advantageous is a configuration of the spray device 10, in which the distance between the earth electrode 5 and the high-voltage electrodes 7 can be changed in order to make an optimum adjustable in terms of charging and jerking
- the earth electrode 5 is tubular and is centered in the support element 6 in the direction of the main axis 12.
- the tubular earth electrode 5 preferably has a diameter of 0.3 cm on the inside and 0.5 cm on the outside.
- a head part 20 At the end of the earth electrode 5 directed towards the chamber, it is closed by a head part 20 provided with rounded edges 17.
- the earth electrode 5 and in particular its head part is 20 covered with a cover 16 made of insulating material to avoid electrical breakdowns.
- the insulating cover 16 has a cover opening 18 on the front with a diameter of approximately 0.1 to 0.5 cm
- Earth electrode cleaning air RLE is passed through earth electrode 5, which avoids powder particle accumulation on earth electrode 5.
- the cleaning air RLE provides additional swirling of the powder, and adjustment or regulation of the powder can be made by changing the air rate. Air ratio
- the tubular earth electrode 5 has openings 19 through which the cleaning air RLE comes out of the tube into a gap 21 between the earth electrode 5 and the cover 16, rewind the head part 20 and out of the cover opening 18 into the Chamber 1 can exit
- the cleaning air RLE, RLH supplied for cleaning the earth electrode 5 or the high-voltage electrodes 7 can advantageously be used to blow powder particles out of the chamber 1 after the supply of the powder / air mixture PL has been switched off, and to deposit the powder particles on the electrodes 5, 7 to avoid
- FIG. 3 shows a powder diagram of a powder spray device in which - as already mentioned above - the powder / air mixture PL is introduced via the feed line 11 against the spraying device.
- an inner baffle plate 24 is shown in FIG. 3, which closer to the powder particles leads to the high-voltage needles 7. The powder then emerges through bores 25 and strikes the outer baffle plate 9
Landscapes
- Electrostatic Spraying Apparatus (AREA)
Abstract
Description
Claims
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP1996/005462 WO1998024555A1 (de) | 1996-12-06 | 1996-12-06 | Pulversprüheinrichtung |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0941145A1 true EP0941145A1 (de) | 1999-09-15 |
EP0941145B1 EP0941145B1 (de) | 2002-09-18 |
Family
ID=8166433
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96942367A Expired - Lifetime EP0941145B1 (de) | 1996-12-06 | 1996-12-06 | Pulversprüheinrichtung |
Country Status (7)
Country | Link |
---|---|
US (1) | US6254684B1 (de) |
EP (1) | EP0941145B1 (de) |
JP (1) | JP3866295B2 (de) |
AU (1) | AU1177497A (de) |
CA (1) | CA2273830A1 (de) |
DE (1) | DE59609702D1 (de) |
WO (1) | WO1998024555A1 (de) |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0978319B1 (de) | 1998-08-07 | 2000-09-20 | ABB Research Ltd. | Pulversprüheinrichtung mit interner und externer Aufladung |
US6814318B2 (en) * | 1999-08-18 | 2004-11-09 | The Procter & Gamble Company | Disposable cartridge for electrostatic spray device |
US20040011901A1 (en) * | 2000-07-10 | 2004-01-22 | Rehman William R. | Unipolarity powder coating systems including improved tribocharging and corona guns |
US20030038193A1 (en) * | 2000-07-11 | 2003-02-27 | Rehman William R. | Unipolarity powder coating systems including improved tribocharging and corona guns |
US20020121240A1 (en) * | 2000-07-11 | 2002-09-05 | Rehman William R. | Unipolarity powder coating systems including improved tribocharging and corona guns |
DE10113299A1 (de) * | 2001-03-16 | 2002-09-19 | Alstom Switzerland Ltd | Verfahren zum Herstellen eines Leiterstabes |
US20040159282A1 (en) * | 2002-05-06 | 2004-08-19 | Sanner Michael R | Unipolarity powder coating systems including improved tribocharging and corona guns |
US6874712B2 (en) * | 2002-09-27 | 2005-04-05 | Abb Inc. | Swirl gun for powder particles |
US20050098659A1 (en) * | 2002-09-27 | 2005-05-12 | Milojevic Dragoslav K. | Swirl gun for powder particles |
US7240861B2 (en) * | 2003-08-12 | 2007-07-10 | The University Of Western Ontario | Method and apparatus for dispensing paint powders for powder coatings |
ITBG20050034A1 (it) * | 2005-06-03 | 2006-12-04 | Trasmetal Spa | Dispositivo elettrostatico di verniciatura. |
DE102005045176A1 (de) * | 2005-09-21 | 2007-03-22 | Ramseier Technologies Ag | Applikator |
US8763936B2 (en) * | 2006-06-23 | 2014-07-01 | Terronics Development Company | Nozzle assembly and methods related thereto |
US20200001311A1 (en) * | 2017-01-30 | 2020-01-02 | Sumitomo Chemical Company, Limited | Electrostatic atomization device, information processing terminal, and control method |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4228961A (en) * | 1979-05-07 | 1980-10-21 | Onoda Cement Co., Ltd. | Electrostatic power painting head |
SU1313511A1 (ru) * | 1985-11-26 | 1987-05-30 | Криворожский горнорудный институт | Трибоэлектростатический сепаратор дл разделени минералов-диэлектриков |
JPH0636891B2 (ja) * | 1986-03-10 | 1994-05-18 | 秀雄 長坂 | 粉体荷電装置および静電粉体塗着装置 |
US4811898A (en) * | 1987-09-21 | 1989-03-14 | Nordson Corporation | Electrostatic powder spray gun with adjustable deflector and electrostatic shield |
WO1991006376A1 (en) * | 1989-11-06 | 1991-05-16 | Frederick David Haig | Spray gun with corona and tubular electrodes |
DE19502522A1 (de) * | 1995-01-27 | 1996-08-01 | Gema Volstatic Ag | Sprühvorrichtung für Beschichtungsmaterial |
-
1996
- 1996-12-06 DE DE59609702T patent/DE59609702D1/de not_active Expired - Lifetime
- 1996-12-06 CA CA002273830A patent/CA2273830A1/en not_active Abandoned
- 1996-12-06 EP EP96942367A patent/EP0941145B1/de not_active Expired - Lifetime
- 1996-12-06 WO PCT/EP1996/005462 patent/WO1998024555A1/de active IP Right Grant
- 1996-12-06 AU AU11774/97A patent/AU1177497A/en not_active Abandoned
- 1996-12-06 JP JP52509598A patent/JP3866295B2/ja not_active Expired - Fee Related
-
1999
- 1999-06-07 US US09/327,007 patent/US6254684B1/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO9824555A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE59609702D1 (de) | 2002-10-24 |
AU1177497A (en) | 1998-06-29 |
WO1998024555A1 (de) | 1998-06-11 |
CA2273830A1 (en) | 1998-06-11 |
JP2001505125A (ja) | 2001-04-17 |
US6254684B1 (en) | 2001-07-03 |
EP0941145B1 (de) | 2002-09-18 |
JP3866295B2 (ja) | 2007-01-10 |
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