EP1461160B1 - Device for electrostatic painting of metallic strips with increase deposition efficiency - Google Patents
Device for electrostatic painting of metallic strips with increase deposition efficiency Download PDFInfo
- Publication number
- EP1461160B1 EP1461160B1 EP02703540A EP02703540A EP1461160B1 EP 1461160 B1 EP1461160 B1 EP 1461160B1 EP 02703540 A EP02703540 A EP 02703540A EP 02703540 A EP02703540 A EP 02703540A EP 1461160 B1 EP1461160 B1 EP 1461160B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- accordance
- strip
- powder
- suction
- planes
- 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
Links
Images
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
- B05B5/14—Plant for applying liquids or other fluent materials to objects specially adapted for coating continuously moving elongated bodies, e.g. wires, strips, pipes
-
- 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
- B05B14/10—Arrangements for collecting, re-using or eliminating excess spraying material the excess material being particulate
-
- 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 present invention relates to a device for exposing a metallic strip to electrostatic painting and suction of the excess powder projected and enabling increased production velocity and finish quality.
- Such an electrostatic painting device is known from DE 7 532 679 U.
- the powder is taken to each gun through a delivery tube connected to a venturi pump fed with compressed air by means of an adjustable pressure reducing valve with pressure readable on a pressure gauge.
- the pumps suck proportionately to the supplied air pressure a certain quantity of powder to be sent to the guns through a tube drawing in a tank of fluidised powder.
- each gun must be set individually by regulating the air pressure of its venturi pump and additional compressed air termed 'dilution air'. It is clear that to increase the painted surface area in the time unit we must increase the number of electrostatic guns or increase the flow of powder to the guns in the time unit.
- Deposit on the strip surface of the electrostatically charged powder is subject basically to two types of forces, to wit:
- the amount of charge absorbed by the powder particles decisively influences deposit on the strip surface.
- the powder is charged by the corona effect (known physical effect of emission of electrons from an electrode connected to a high voltage generator which in attaching to the surrounding air molecules makes them, from neutral, electrically charged negative charges and in turn they adhere to particular zones of the surface of the powder grains known as electronegative affinity).
- the amount of charge imparted to the powder depends on several parameters, to wit:
- the increase in the electrode current under specific conditions allows charging a larger quantity of powder emitted thus approaching the 60% theoretical deposit.
- the positioning and suction device which is the object of the present invention also achieves the following purposes:
- figure 1 shows the normal positioning of the metallic strip (1) stretched by the tension rollers (2) and (3) with the electrostatic guns (4) in painting position perpendicular to the surface.
- Figure 2 shows diagrammatically the field intensity near the strip surface with the darker segment (8) occupying a portion of the strip surface approximately equal to that of the powder emission cone from the gun.
- the trend of projection of the powder (9) is characterized by zones (10) where the rebound of the particles thereof projected towards the surface causes rotary motion thereof, which is accelerated on the edges of the strip because of the air suction of the hood (11) to recover the powder particles which were not deposited. Because of the powder friction effect this acceleration can cause considerable thickness differences on the strip edges due to erosion as explained above.
- the very intense electrical field on the strip surface in the powder deposit zone has the described effect of having a repulsion force towards the powder particles which are to be deposited on the surface.
- This force tends to accelerate the powder with a direction contrary to that of their aerodynamic velocity directed towards the exposed surface. Therefore the powder particles tend to slow down their deposit velocity.
- This slowing has the effect that near the surface there is a dense layer of accumulated particles in balance between the various forces, viz electrostatic and aerodynamic, which prevents further deposit of the powder.
- Figure 4 shows graphically what happens with the repulsion effects due to the electrical fields and particle charges.
- the deposited particles (12) represent a surface charge with associated electrical field (13) represented by the arrows which repel the new powder particles (14) represented as thickened with respect to the particles (15) emitted near the gun since they are slowed by the field (13). It is clear that as the air and powder mixture emitted becomes denser this phenomenon is accentuated.
- the system invented allows diminishing the effect of the gun electrical fields, cancelling the effects due to powder emission velocity and hence cancellation of the erosion effects and allowing greater production velocity.
- the invention consists of a tension means or roller (22) placed in any position between the rollers normally used (2) and (3) so as to form a more or less acute angle and the two suction means or hoods (16) and (17) positioned so as to suck air only in parallel and not laterally with respect to the two new running planes of the strip (19) and (18).
- the paint guns are positioned at the height of the corner (20) formed by the two planes (19) and (18).
- the particles deposited along the plane (18) must have an electrical charge such as to allow adhesion to the surface and overcome both the suction force of the hood (17) and the force of gravity which tends to detach them. It is clear that the layer of powder deposited on this plane is made up only of particles having an excellent electrical charge with those having an insufficient charge to overcome the forces of suction and gravity being eliminated.
- This type of coating made up of particles with strong adhesion ensures a surface with excellent spreading and visual finish once it is polymerized in the baking oven as known.
- the suction hood (16) is shifted into a position closer to the corner (20) and this is done in such a manner that its suction velocity is greater than that of the hood (17) so as to make up for the force of gravity effect which would oblige the uncharged particles to fall back on the strip.
- the powder emission is divided mechanically along the two running planes.
- deflectors can be provided.
- Known shifting means in painting system (4) enable distribution of the painting powder on the two planes in a chosen manner by shifting the painting system upward or downward relative to the corner.
- the present invention enables:
- the device in accordance with the present invention is easy and economical to construct despite the considerable advantages which it brings to the industrial process of electrostatic painting of metallic strips.
Abstract
Description
- the electrode emission current which in turn depends on the voltage applied and the distance thereof from the painting surface, and
- the density of the air & powder mixture emitted; the denser it is the denser is the dispersion of the electrical charges and the smaller the quantity of powder charged electrostatically.
- Figure 1 shows the normal positioning of a metallic strip and electrostatic guns in a painting plant.
- Figure 2 shows diagrammatically the field intensity in the device of figure 1.
- Figure 3 shows the trend of the powder near the surface in the device of figure 1.
- Figure 4 shows graphically the repulsion effects in the device of figure 1.
- Figure 5 shows a possible embodiment of a device of the present invention.
- Figure 6 shows the tendency of the gun electrical field lines in the device of figure 5.
- elimination of the electrical field effect of the guns,
- dilution of the density of the powder emitted because of its distribution over a greater surface area and because of the suction which increases its velocity along the deposit surfaces independently of the projection density,
- elimination of the counter corona effects caused by the electrical fields, and
- increase of production speed thanks to the fact that increased powder dilution does not allow slowing effects as described of deposit near the surfaces.
Claims (17)
- Device for painting metallic strips (1) with electrostatic powder, comprising a painting system which emits the powder toward the strip (1), characterized by strip tension means (22) positioned in such a manner as to form around it a more or less acute angle with the strip (1); two suction means (16, 17) located along strip planes coming out of said angle, the suction means (16, 17) having suction parallel to said planes and the painting system (4) emitting perpendicular to said angle formed by said planes.
- Device in accordance with claim 1 characterized by a tension means (22) comprising a roller.
- Device in accordance with claim 1 characterized by the suction means (16, 17) comprising a suction hood.
- Device in accordance with claim 3 characterized by air suction by the two hoods parallel to the two planes in which the strip (1) is divided around the tension means (22).
- Device in accordance with claim 1 characterized in that the two suction means (16, 17) have different suction flow.
- Device in accordance with claim 1 characterized in that one suction means is located at a smaller distance than the other from the corner formed by said angle.
- Device in accordance with claim 1 characterized in that one of said strip planes is over the other strip plane.
- Device in accordance with claim 7 characterized in that the suction means (16, 17) corresponding the said one strip plane has suction velocity greater than the suction velocity of suction means corresponding the other strip plane.
- Device in accordance with claim 7 characterized in that the suction means (16, 17) corresponding the said one strip plane is located at a smaller distance than the other from the corner formed by said angle.
- Device in accordance with claim 1 characterized by the positioning of the painting system (4) perpendicular to corner formed by said angle.
- Device in accordance with claim 1 characterized in that the powder emission is divided mechanically along the two running planes.
- Device in accordance with claim 1 characterized in that it enables dilution of the powder emitted by means of an external suction system.
- Device in accordance with claim 1 characterized by dilution of the powder dividing its flow along two independent surfaces.
- Device in accordance with claim 1 characterized by decreasing the electrical fields by causing them to close on a salient part such as the corner formed by the said angle.
- Device in accordance with the claim 1 characterized by distributing the painting powder on the two planes in a chosen manner by shifting means which shift the painting system (4) upward or downward relative to the corner.
- Device in accordance with the claim 1 characterized in that the tension means (22) forming a curve around itself for a metallic strip.
- Device in accordance with claim 1 characterized by at least two suction hoods.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP2002/000116 WO2003055609A1 (en) | 2002-01-02 | 2002-01-02 | Device for electrostatic painting of metallic strips with increase deposition efficiency |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1461160A1 EP1461160A1 (en) | 2004-09-29 |
EP1461160B1 true EP1461160B1 (en) | 2005-03-16 |
Family
ID=8164770
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02703540A Expired - Lifetime EP1461160B1 (en) | 2002-01-02 | 2002-01-02 | Device for electrostatic painting of metallic strips with increase deposition efficiency |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP1461160B1 (en) |
AT (1) | ATE290930T1 (en) |
AU (1) | AU2002237262A1 (en) |
DE (1) | DE60203326D1 (en) |
ES (1) | ES2236484T3 (en) |
WO (1) | WO2003055609A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7626602B2 (en) | 2006-09-15 | 2009-12-01 | Mcshane Robert J | Apparatus for electrostatic coating |
GB0911260D0 (en) * | 2009-06-30 | 2009-08-12 | British American Tobacco Co | Applicator |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE7215571U (en) * | 1974-04-18 | Voith J Gmbh | Device for applying liquid or powdery agents to a moving paper web | |
DE7532679U (en) * | 1977-05-05 | Roeth + Co, 6700 Ludwigshafen | Device for the electrostatic spraying of a flat object, in particular a moving paper web | |
GB1072951A (en) * | 1964-03-23 | 1967-06-21 | Gevaert Photo Prod Nv | Method and apparatus for coating liquid compositions onto webs of paper and other material |
US4826703A (en) * | 1987-06-01 | 1989-05-02 | Polaroid Corporation | Method and apparatus for electrically controlling coating layer dimensions |
DE69115380T2 (en) * | 1990-08-09 | 1996-06-13 | Ici Plc | Spraying liquids |
US6040004A (en) * | 1995-03-09 | 2000-03-21 | 3M Innovative Properties Company | Method and apparatus for fabricating a particle-coated substrate, and such substrate |
-
2002
- 2002-01-02 ES ES02703540T patent/ES2236484T3/en not_active Expired - Lifetime
- 2002-01-02 AU AU2002237262A patent/AU2002237262A1/en not_active Abandoned
- 2002-01-02 WO PCT/EP2002/000116 patent/WO2003055609A1/en not_active Application Discontinuation
- 2002-01-02 EP EP02703540A patent/EP1461160B1/en not_active Expired - Lifetime
- 2002-01-02 AT AT02703540T patent/ATE290930T1/en not_active IP Right Cessation
- 2002-01-02 DE DE60203326T patent/DE60203326D1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
EP1461160A1 (en) | 2004-09-29 |
DE60203326D1 (en) | 2005-04-21 |
ATE290930T1 (en) | 2005-04-15 |
ES2236484T3 (en) | 2005-07-16 |
AU2002237262A1 (en) | 2003-07-15 |
WO2003055609A1 (en) | 2003-07-10 |
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