EP0956909A1 - Verfahren und Vorrichtung zum kontinuierlichen elektrostatischen Auftragen einer pulverförmigen Substanz auf einem Substrat - Google Patents

Verfahren und Vorrichtung zum kontinuierlichen elektrostatischen Auftragen einer pulverförmigen Substanz auf einem Substrat Download PDF

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Publication number
EP0956909A1
EP0956909A1 EP98870128A EP98870128A EP0956909A1 EP 0956909 A1 EP0956909 A1 EP 0956909A1 EP 98870128 A EP98870128 A EP 98870128A EP 98870128 A EP98870128 A EP 98870128A EP 0956909 A1 EP0956909 A1 EP 0956909A1
Authority
EP
European Patent Office
Prior art keywords
powder
substrate
enclosure
cylinder
faces
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
Application number
EP98870128A
Other languages
English (en)
French (fr)
Other versions
EP0956909B1 (de
Inventor
Jean Schrijnemackers
Pierre Vanden Brande
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.)
ArcelorMittal Liege Upstream SA
Original Assignee
Cockerill Sambre 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 Cockerill Sambre SA filed Critical Cockerill Sambre SA
Publication of EP0956909A1 publication Critical patent/EP0956909A1/de
Application granted granted Critical
Publication of EP0956909B1 publication Critical patent/EP0956909B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B05B5/025—Discharge apparatus, e.g. electrostatic spray guns
    • B05B5/057—Arrangements for discharging liquids or other fluent material without using a gun or nozzle
    • 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
    • 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
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/30—Processes for applying liquids or other fluent materials performed by gravity only, i.e. flow coating
    • 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
    • B05B5/16—Arrangements for supplying liquids or other fluent material
    • B05B5/1683—Arrangements for supplying liquids or other fluent material specially adapted for particulate materials
    • 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
    • B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
    • B05C9/04—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material to opposite sides of the work
    • 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
    • B05D2401/00—Form of the coating product, e.g. solution, water dispersion, powders or the like
    • B05D2401/30—Form of the coating product, e.g. solution, water dispersion, powders or the like the coating being applied in other forms than involving eliminable solvent, diluent or dispersant
    • B05D2401/32—Form of the coating product, e.g. solution, water dispersion, powders or the like the coating being applied in other forms than involving eliminable solvent, diluent or dispersant applied as powders

Definitions

  • the present invention relates to a method for the continuous application of a powdered substance, in particular of powder paint, on an elongated substrate, presenting preferably in the form of a continuous band, running substantially vertically in the direction of its length through an enclosure deposit into which the above powder is introduced in a manner substantially continuous and in which an electric field is created allowing this powder to be applied to at least one of the two faces of the substrate.
  • One of the essential aims of the present invention is to offer an extremely simple and reliable process to very large yield allowing to obtain a highly uniform powder deposit both over the entire width of the substrate to be coated and over its length, and this at very small thicknesses, of the order of 10 microns, up to relatively large thicknesses, of the order of 250 microns, without need to take special precautions.
  • the powder is fed to deposit on the substrate at the top of the deposit enclosure so as to allow this powder to move essentially through gravity along the substrate surface (s) on which or which this powder is to be applied.
  • the invention also relates to a device for application of the above process.
  • This device comprises a deposition enclosure having an opening at its upper part and an opening at its part lower through which the above-mentioned substrate can pass in this enclosure, a feeding device for introducing the above-mentioned powder continuously in this enclosure when the substrate and means for creating a field therein electric to apply this powder on one or both sides of the substrate.
  • This device is essentially characterized by the fact that the deposit enclosure has, at its upper part, an opening feed for the powder so that it can fall out freely as a relatively homogeneous and uniform current powdery particles along the substrate surface (s) running in the depository parallel to the downdraft of this powder.
  • the walls of the enclosure are made made of an electrical insulating material or are covered internally of such material.
  • the enclosure comprises, along its walls facing the plane according to which the substrate can pass through the enclosure, at least one electrode, but preferably a succession of electrodes formed by a series of conducting wires extending at a certain distance one on the other along the above-mentioned plane, these wires being separated from these walls and located on the passage for powder that can be spilled from a continuously and at a controllable rate across the top of the enclosure.
  • the method according to the invention is on the continuous electrostatic application of a substance in powder on an elongated substrate, consisting for example of a continuous strip, such as a steel sheet in the form of a continuous rollable tape.
  • the powdered substance can be very varied in nature, allowing for example to form on a substrate a layer of protection or an electrically insulating layer on a substrate conductive or a decorative layer in the case where the powder contains pigments or dyes.
  • this substrate is scrolled vertically following the direction of its length through a deposit enclosure in which the above-mentioned powder is introduced continuously, according to a uniform current, and at an adjustable rate while creating a field electric allowing to apply this powder on one or on two sides of the substrate.
  • This process is characterized in relation to the processes known by the fact that the powder is fed to the upper part of the depository by means of a device or installation suitable, in such a way as to allow this powder to move essentially by simple gravity along the surface (s) of the substrate to which it is to be fixed.
  • Figure 1 relates to a first embodiment a particular device for implementing this process.
  • This is in particular a device for the application electrostatic continuous powder paint 5 on one side of a continuous strip of a substrate 1 which runs vertically, from low year top or top to bottom, in a storage enclosure 2.
  • enclosure 2 It is an enclosure 2 whose walls 3 are made of an electrical insulating material, preferably a plastic material transparent, like Plexiglas or polycarbonate. In some case, the interior faces of these walls can simply be covered by electrical insulating material.
  • This enclosure is formed by a standing box having at its upper end an opening 4 for feeding the powder 5 in the deposition chamber 2 and for the passage of the substrate 1 moving vertically over the entire height of the latter. So, a slot 6 for the passage of the substrate 1 is provided in the bottom 7 of enclosure 2.
  • this bottom 7 has a hopper 8 making it possible to harvest the excess powder which may not have been deposited on the substrate, which can then be discharged through an orifice 8 '.
  • This 8 'orifice can be connected to an installation of recycling, not shown, in which the collected powder is sucked so that it can be reused.
  • the electric field is created in the deposit enclosure 2 at means of electrodes 9 which can be brought to a high continuous voltage, preferably negative, with respect to substrate 1, the latter being preferably grounded.
  • these electrodes consist of a series of conductive wires 9 extending at a certain distance one above the other opposite the face of the substrate 1, on which the powder 5 must be fixed, transversely to the direction of travel of the latter, parallel to each other and fixed by their ends to the side walls extending in planes perpendicular to the plane in which the substrate 1 moves.
  • these conductive wires 9 are located at a certain distance from the wall 3 of the box 2 opposite to the face of the substrate 1 to cover with powder 5. They can, for example be made of copper, in tungsten or steel.
  • this powder 5 moves in deposit enclosure 2 up and down only under the effect of gravity.
  • the conducting wires 9, forming the electrodes are arranged in such a way that, when the powder 5 falls, it essentially passes in the area of enclosure 2 between these wires 9 and the substrate 1 and is negatively electrostatically charged by corona effect to then be attracted to substrate 1 thanks to the field intense electric prevailing in the powder passage zone between the substrate and the wires.
  • Working parameters and conditions can be set in such a way that the powder 5 arises with a very high application yield on substrate 1, generally greater than 95%.
  • the conducting wires 9 are brought to a high voltage continuous negative and that the substrate is grounded reduces maximum risk of breakdown and powder deposition on the wires.
  • the value of the high voltage should be the most as high as possible to form a crown discharge around the wires, but in practice this value is limited by the breakdown limit which could ignite the powder. Furthermore, too low a voltage does not not allow to obtain the desired crown discharge around the wires and negatively influences the efficiency of the deposit on the substrate.
  • an ideal and safe value of the electric field is located around 3500 volts per cm.
  • the breakdown limit changes within air when it contains powder. So the powder, at the concentration used, halves the breakdown voltage, which is around 10 kV per cm in dry air. However, none notable influence of the humidity level of the air in the enclosure on the effectiveness of the deposit has not been established. According to the invention, it is however recommended to work in a controlled atmosphere of dry air and fresh at a temperature of at most 20 ° C, in order to avoid, on the one hand, agglomeration of the powder and, on the other hand, any chemical preaction anticipated.
  • the conducting wires 9 must be located at a certain distance from the substrate which must at least be such as to avoid the physical contact between the wires and the substrate. This distance cannot be too large for economic and technical reasons, in particular to avoid having to use too high voltages.
  • a possible value of wire-substrate distance is approximately 5 to 12 cm. A preference is given for a distance of the order of 7 cm with a voltage of the order of 25 kV.
  • the number of conducting wires 9 is a function of the flow rate of the powder 5 which enters the deposit vessel 2 and which must be deposited on the substrate 1.
  • An ideal value for obtaining a deposit yield greater than 95%, the other conditions being optimal, is of the order of 700 to 900 g of powder per minute, per meter of width of the substrate and by common thread.
  • the distance between the wires 9 can also have an effect on the yield of the deposit formed by the powder 5 on the substrate 1. In fact, the closer the wires 9 are to each other, the less they behave independently and minus the total passing electrical current between the wires 9 and the substrate 1, formed for example by a strip continues, is high. Ideally, this distance will be as large as possible. According to the invention, it has been found that a distance giving excellent results is of the order of 20 cm between two consecutive wires.
  • the conducting wires 9 are not applied against the wall 3 of the enclosure 2 opposite and parallel to the substrate 1. It has indeed been found that, in this case, the deposition efficiency is relatively reduced. Ideally, the wires 9 must be at least 5 to 10 cm away from this wall 3.
  • the diameter of the wires 9 is also a parameter important, since the crown effect is all the more intense as the wire diameter is small, due to the peak effect. It was found that excellent results have been obtained with wires of a diameter about 100 to 250 microns.
  • Figure 2 relates to a second embodiment of a device according to the invention.
  • This device is distinguished from that shown in the Figure 1 by the fact that it is provided for the simultaneous fixing of powder 5 on both sides of a substrate 1.
  • the enclosure deposit 2 extends symmetrically on either side of the plane in which must pass the substrate 1 on which the powder 5 must be fixed.
  • the powder is fed on either side of this plane and the wires conductors 9 are also provided on each side of this plane.
  • the apparatus 10 used to introduce the powder by gravity in the upper part of the enclosure can be very varied in nature. What matters above all is that it allows a distribution to be obtained uniform and controllable flow rate of the powder 5 introduced by gravity by the feed opening 4 in the deposit enclosure 2.
  • this device 10 should preferably make it possible to adapt the width of feeding the powder as a function of the width of the substrate to be coated.
  • it must make it possible to deliver a relatively large quantity powder in a continuous, regular and homogeneous way across the width desired.
  • the powder flow can vary from 0 g to a value of the order 10,000 g per minute and per meter of width of the substrate.
  • this device 10 allows to regulate the powder flow linearly.
  • a supply apparatus 10 meeting these requirements has was shown schematically in Figure 3. This is a kind of sprinkler which is mounted directly above the opening supply 4 of the storage enclosure 2.
  • This device includes a mounted feed hopper 11 above a cylinder 12 which can rotate, at an adjustable speed, around a horizontal axis 13 in the direction of arrow 14.
  • the surface of the cylinder 12 is coated with metal studs 15, so as to allow, during the rotation of the cylinder 12 about its axis 13, to cause, by the lower opening 16 of the hopper 11, a metered quantity of powder, contained in the hopper, on the cylindrical surface of cylinder 12 in the direction of the arrow 14.
  • a rotary brush 17 which can rotate at a speed adjustable around a horizontal axis 18 in the direction of arrow 19 is applied against this cylindrical surface, on the side of the hopper 11 where the powder 5 is removed from the latter by the pins 15 on this cylindrical surface and is applied against said surface to allow detach the powder, break up any agglomerates and spray the powder down.
  • the axis of rotation 18 of this brush 17 is preferably located substantially at the same level as the axis 13 of the cylinder 12 and its rotation speed is generally continuously adjustable between 0 and 4500 rpm.
  • this brush 17 includes pins relatively rigid metals, for example steel, of a length between 1 and 2 cm, and the distance from the axis 13 of cylinder 12 is such that the end of the pins 20 is just in contact with the surface of it, as these pass into the plane defined by the axes of rotation 13 and 18.
  • the width of the powder feed on the surface of the cylinder 12 can be adjusted by positioning two cheeks, not shown, located in the hopper 11 and parallel to the walls transverse of the latter. Thus, a width of more than 2 m is easily conceivable.
  • the powder flow is linearly adjustable by playing only on the speed of rotation of the cylinder 12 around its axis 13.
  • the latter can optionally be heated so as to subject this powder to at least partial melting to form a coating substantially uniform and durable on this substrate.
  • This heating can be provided directly at the place where the substrate leaves the deposit enclosure.
  • the substrate has a face to be coated made of an electrically conductive material, such as a sheet metal steel, it can advantageously be subjected to firing by induction after fixing the powder on the substrate.
  • This subsequent heating is advantageously carried out as the substrate moves vertically, in the same way so that when applying the powder and this in order to reduce the surface on the ground, to precisely position the substrate 1 between the turns of the inductor, not shown in the figures, and to avoid the need use intermediate support cylinders.
  • the object of the invention is further illustrated by a few concrete examples of applying a powder paint on a substrate formed by a steel strip in a device of the type such as shown in the accompanying figures.
  • the invention is not limited to the use of a specific powder supply system.
  • this powder can move substantially by gravity through the depository, and this in a continuous and homogeneous manner at a relatively high throughput.
  • the method according to the invention is not only applicable on a metallic substrate, such as steel, coated steel or aluminum for example, but also on a substrate made electrically conductive, such as paper, cardboard, plastic, textiles, etc., for example covered with a film driver

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  • Application Of Or Painting With Fluid Materials (AREA)
  • Electrostatic Spraying Apparatus (AREA)
EP98870128A 1998-05-14 1998-06-05 Verfahren und Vorrichtung zum kontinuierlichen elektrostatischen Auftragen einer pulverförmigen Substanz auf einem Substrat Expired - Lifetime EP0956909B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE9800367 1998-05-14
BE9800367A BE1011917A6 (fr) 1998-05-14 1998-05-14 Procede et dispositif pour l'application electrostatique en continu d'une substance en poudre sur un substrat.

Publications (2)

Publication Number Publication Date
EP0956909A1 true EP0956909A1 (de) 1999-11-17
EP0956909B1 EP0956909B1 (de) 2003-03-05

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Application Number Title Priority Date Filing Date
EP98870128A Expired - Lifetime EP0956909B1 (de) 1998-05-14 1998-06-05 Verfahren und Vorrichtung zum kontinuierlichen elektrostatischen Auftragen einer pulverförmigen Substanz auf einem Substrat

Country Status (5)

Country Link
EP (1) EP0956909B1 (de)
AT (1) ATE233609T1 (de)
BE (1) BE1011917A6 (de)
DE (1) DE69811858T2 (de)
ES (1) ES2193506T3 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990009043A2 (en) 1989-01-25 1990-08-09 W.L. Gore & Associates, Inc. A coaxial cable connector assembly
BE1013690A3 (fr) * 2000-09-19 2002-06-04 Cockerill Rech & Dev Dispositif d'application electrostatique de poudre de revetement.
EP1690600A1 (de) 2005-02-10 2006-08-16 Dmsys Anlage und Verfahren zum kontinuierlichen, elektrostatischen Beschichten von Substraten mit Pulver
WO2015033021A1 (en) * 2013-09-09 2015-03-12 Beneq Oy Method of coating a substrate
WO2024182808A1 (en) * 2023-03-02 2024-09-06 AM Batteries, Inc. Electrostatic coating system

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1075946A (en) * 1963-07-17 1967-07-19 Jan Gunnar Myhre Apparatus for coating strips of metal or the like with plastics material
US3857362A (en) * 1972-05-23 1974-12-31 D Brooks Metal powder coating apparatus
US3916826A (en) * 1973-09-18 1975-11-04 Electrostatic Equip Corp Electrostatic coating apparatus
US4084019A (en) * 1976-02-05 1978-04-11 Armco Steel Corporation Electrostatic coating grid and method
US4188413A (en) * 1976-10-18 1980-02-12 General Electric Company Electrostatic-fluidized bed coating of wire
US4243696A (en) * 1979-01-22 1981-01-06 W. S. Rockwell Company Method of making a particle-containing plastic coating
US4795339A (en) * 1985-09-09 1989-01-03 Terronics Development Corp. Method and apparatus for depositing nonconductive material onto conductive filaments
US5279863A (en) * 1989-10-10 1994-01-18 David A. Lundy Electrostatic powder coating apparatus and method
WO1995032809A1 (en) * 1994-05-26 1995-12-07 Electrostatic Technology, Inc. Vertical electrostatic coater having vortex effect

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1075946A (en) * 1963-07-17 1967-07-19 Jan Gunnar Myhre Apparatus for coating strips of metal or the like with plastics material
US3857362A (en) * 1972-05-23 1974-12-31 D Brooks Metal powder coating apparatus
US3916826A (en) * 1973-09-18 1975-11-04 Electrostatic Equip Corp Electrostatic coating apparatus
US4084019A (en) * 1976-02-05 1978-04-11 Armco Steel Corporation Electrostatic coating grid and method
US4188413A (en) * 1976-10-18 1980-02-12 General Electric Company Electrostatic-fluidized bed coating of wire
US4243696A (en) * 1979-01-22 1981-01-06 W. S. Rockwell Company Method of making a particle-containing plastic coating
US4795339A (en) * 1985-09-09 1989-01-03 Terronics Development Corp. Method and apparatus for depositing nonconductive material onto conductive filaments
US5279863A (en) * 1989-10-10 1994-01-18 David A. Lundy Electrostatic powder coating apparatus and method
WO1995032809A1 (en) * 1994-05-26 1995-12-07 Electrostatic Technology, Inc. Vertical electrostatic coater having vortex effect

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990009043A2 (en) 1989-01-25 1990-08-09 W.L. Gore & Associates, Inc. A coaxial cable connector assembly
BE1013690A3 (fr) * 2000-09-19 2002-06-04 Cockerill Rech & Dev Dispositif d'application electrostatique de poudre de revetement.
EP1690600A1 (de) 2005-02-10 2006-08-16 Dmsys Anlage und Verfahren zum kontinuierlichen, elektrostatischen Beschichten von Substraten mit Pulver
WO2015033021A1 (en) * 2013-09-09 2015-03-12 Beneq Oy Method of coating a substrate
WO2024182808A1 (en) * 2023-03-02 2024-09-06 AM Batteries, Inc. Electrostatic coating system

Also Published As

Publication number Publication date
ATE233609T1 (de) 2003-03-15
DE69811858T2 (de) 2004-03-04
EP0956909B1 (de) 2003-03-05
BE1011917A6 (fr) 2000-03-07
ES2193506T3 (es) 2003-11-01
DE69811858D1 (de) 2003-04-10

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