EP0956909B1 - Procédé et dispositif pour l'application électrostatique en continu d'une substance en poudre sur un substrat - Google Patents
Procédé et dispositif pour l'application électrostatique en continu d'une substance en poudre sur un substrat Download PDFInfo
- Publication number
- EP0956909B1 EP0956909B1 EP98870128A EP98870128A EP0956909B1 EP 0956909 B1 EP0956909 B1 EP 0956909B1 EP 98870128 A EP98870128 A EP 98870128A EP 98870128 A EP98870128 A EP 98870128A EP 0956909 B1 EP0956909 B1 EP 0956909B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- substrate
- enclosure
- powder
- electric field
- deposition
- 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
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Classifications
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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 invention also relates to a device for application of the above process.
- a device is provided as indicated to claim 12.
- Other embodiments of a device according to the invention are indicated in claims 13 to 20.
- 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 made up 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 allowing the passage for powder that can be poured from a continuously and at a controllable flow 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 case 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 of a particular device for implementing this method.
- 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 bottom to 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 or opening 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 evacuated 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 DC voltage, preferably negative, with respect to substrate 1, the latter being preferably grounded.
- these electrodes 9 consist of a series of conductive wires extending a certain distance above each 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 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 is moves in the deposit enclosure 2 up and down only under the effect of gravity.
- the conductive wires, forming the electrodes are arranged in such a way that, when the powder 5 falls, it basically goes in the area of enclosure 2 between these wires 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 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 high possible so as 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 achieve 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.
- Lead wires should 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 depends on the flow 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 can also have an effect on the yield of the deposit formed by the powder 5 on the substrate 1.
- this distance will be as large as possible. According to the invention, it has been found that a distance giving excellent results is around 20 cm between two consecutive wires.
- the conductive wires 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 is also a parameter important, since the crown effect is all the more intense as the wire diameter is small due to the tip 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 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 makes it possible to obtain a distribution 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. It is a kind of sprinkler that 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 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.
Landscapes
- Electrostatic Spraying Apparatus (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Description
- application verticale sur une face ; la bande défile de bas en haut.
- poudre : polyester-TGIC de répartition granulométrique comprise entre 1 et 150 µ avec un maximum de la courbe à 50 µ.
- vitesse de ligne : 30 m/min.
- débit de poudre : 5280 g/min * m de large
- 6 fils de cuivre de 100 µm de diamètre espacés de 20 cm et placés à 7 cm de la tôle
- tension appliquée = 25 kV
- épaisseur moyenne mesurée après cuisson : 80 µ (avec un Δ de 5 % maximum sur la largeur)
- application verticale sur une face ; la bande défile de bas en haut
- poudre : polyester-TGIC de répartition granulométrique comprise entre 1 et 150 µ avec un maximum de la courbe à 50 µ
- vitesse de ligne : 50 m/min
- débit de poudre : 8800 g/min * m de large
- 12 fils de cuivre de 100 µm de diamètre espacés de 20 cm et placés à 7 cm de la tôle
- tension appliquée = 25 kV
- épaisseur moyenne mesurée après cuisson : 78 µ (avec un Δ de 5 % maximum sur la largeur)
- application verticale sur une face ; la bande défile de bas en haut
- poudre : polyester-TGIC de répartition granulométrique comprise entre 1 et 150 µ avec un maximum de la courbe à 50 µ
- vitesse de ligne: 70 m/min
- débit de poudre : 8800 g/min * m de large
- 12 fils de cuivre de 100 µm de diamètre espacés de 20 cm et placés à 7 cm de la tôle
- tension appliquée = 25 kV
- épaisseur mesurée après cuisson : 58 µ (avec un Δ de 5 % maximum sur la largeur)
- application verticale sur une face ; la bande défile de bas en haut
- poudre : polyester-TGIC de répartition granulométrique comprise entre 1 et 150 µ avec un maximum de la courbe à 50 µ
- vitesse de ligne : 30 m/min
- débit de poudre : 5280 g/min * m de large
- 6 fils de cuivre de 1 mm de diamètre espacés de 5 cm et placés à 7 cm de la tôle
- tension appliquée = 22 kV
- épaisseur mesurée après cuisson : 45 µ (avec un Δ de 5 % maximum sur la largeur).
Claims (20)
- Procédé pour l'application en continu d'une substance en poudre (5), notamment d'une peinture en poudre, sur un substrat oblong (1) conducteur d'électricité ou rendu conducteur d'électricité, présentant deux faces, de préférence sous forme d'une bande continue, comprenant
un défilement sensiblement verticalement du substrat (1) suivant la direction de sa longueur à travers une enceinte de dépôt (2),
une introduction de la poudre dans l'enceinte de manière sensiblement continue, et
une création à l'aide d'électrodes (9) d'un champ électrique dans l'enceinte, permettant d'appliquer cette poudre sur le substrat,
caractérisé en ce qu'il comprend en outre
la création d'au moins un champ électrique entre au moins une électrode (9) et la ou les faces à revêtir du substrat,
une alimentation de la poudre (5) à une partie supérieure de l'enceinte de dépôt,
un écoulement par gravité d'un courant uniforme de particules de poudre le long de la ou les faces du substrat à revêtir, entre celle-ci et ladite au moins une électrode (9), et
un chargement électrostatique des particules de la poudre pendant ledit écoulement, avec attraction de celles-ci sur la face correspondante du substrat (1) à revêtir grâce audit au moins un champ électrique créé. - Procédé suivant la revendication 1, caractérisé en ce que l'on utilise une enceinte (2) dont les parois (3) sont réalisées en un ou recouverte intérieurement d'un matériau isolant électrique, de préférence en une matière plastique transparente.
- Procédé suivant l'une ou l'autre des revendications 1 et 2, caractérisé en ce que l'on crée le champ électrique dans l'enceinte (2) de dépôt au moyen d'électrodes (9) portées à une haute tension continue, de préférence négative par rapport au substrat (1), ce dernier étant de préférence mis à la terre.
- Procédé suivant l'une quelconque des revendications 1 à 3, caractérisé en ce que l'on crée le champ électrique dans l'enceinte de dépôt (2) au moyen d'une série de fils conducteurs s'étendant à une certaine distance l'un au-dessus de l'autre, en regard d'au moins l'une des faces du substrat, écartés des parois (3) de l'enceinte opposées à ces faces et transversalement par rapport à la direction de défilement du substrat.
- Procédé suivant l'une quelconque des revendications 1 à 4, caractérisé en ce que l'on charge la poudre dans l'enceinte de dépôt (2), électrostatiquement de manière négative par effet corona pour qu'elle soit ensuite attirée vers le substrat grâce au champ électrique présent.
- Procédé suivant l'une quelconque des revendications 1 à 5, caractérisé en ce que l'on crée dans l'enceinte de dépôt (2) un champ électrique de l'ordre de 3.500 Volts par cm.
- Procédé suivant l'une quelconque des revendications 1 à 6, caractérisé en ce qu'on introduit la poudre dans l'enceinte de dépôt (2) avec un débit jusqu'à 10.000 g par minute et par mètre de largeur du substrat à traiter.
- Procédé suivant la revendication 7, caractérisé en ce qu'on règle le débit de la poudre dans l'enceinte de dépôt (2) entre 700 et 900 grammes par minute, par mètre de largeur du substrat et par fil conducteur.
- Procédé suivant l'une quelconque des revendications 1 à 8, caractérisé en ce qu'après la fixation de la poudre (5) sur le substrat (1), celui-ci est chauffé de manière à soumettre cette poudre à une fusion au moins partielle permettant de former un revêtement sensiblement uniforme sur le substrat.
- Procédé suivant la revendication 9, caractérisé en ce que, dans le cas où le substrat (1) présente une face à revêtir constituée d'une matière conductrice d'électricité, celle-ci est soumise à une cuisson par induction après la fixation de la poudre sur cette face.
- Procédé suivant l'une ou l'autre des revendications 9 et 10, caractérisé en ce que le chauffage précité est réalisé immédiatement à la sortie de l'enceinte de dépôt (2) pendant que le substrat se déplace verticalement.
- Dispositif pour l'application en continu d'une substance en poudre (5), notamment de peinture en poudre, sur un substrat oblong (1) conducteur d'électricité ou rendu conducteur d'électricité, présentant deux faces, de préférence sous forme d'une bande continue, comprenant
une enceinte de dépôt (2) présentant une ouverture à sa partie supérieure (4) et à sa partie inférieure (6) à travers lesquelles peut défiler le substrat susdit (1) dans cette enceinte (2),
un appareil d'alimentation (10) permettant d'introduire la poudre susdite (5) d'une manière sensiblement continue dans cette enceinte (2) lors du défilement du substrat (1), et
des moyens pour créer dans cette enceinte (2) au moins un champ électrique permettant d'appliquer cette poudre (5) sur au moins l'une des faces du substrat (1),
caractérisé en ce que l'enceinte présente, à sa partie supérieure, une ouverture d'alimentation (4) pour la poudre (5) permettant d'introduire cette dernière, dans cette enceinte,
et en ce que lesdits moyens pour créer au moins un champ électrique sont constitués d'au moins une électrode et la ou les faces du substrat à revêtir, entre lesquels s'écoule par gravité un courant de particules de ladite poudre introduite, le long de ladite au moins une face du substrat à revêtir, les particules de poudre étant ainsi chargées électrostatiquement grâce audit au moins un champ électrique créé et attirées sur la face correspondante du substrat à revêtir. - Dispositif suivant la revendication 12, caractérisé en ce que les parois de l'enceinte (2) sont réalisées en un matériau isolant électrique, de préférence en une matière plastique transparente.
- Dispositif suivant l'une ou l'autre des revendications 12 et 13, caractérisé en ce que l'enceinte (2) comprend, le long de ses parois, en regard du plan suivant lequel le substrat (1) peut défiler à travers l'enceinte (2), au moins une électrode (9) à laquelle une haute tension continue peut être appliquée par rapport à ce substrat (1).
- Dispositif suivant la revendication 14, caractérisé en ce que l'enceinte (2) comprend une série d'électrodes successives (9) réparties suivant la hauteur de l'enceinte (2) en regard du plan dans lequel le substrat (1) peut se déplacer dans cette dernière.
- Dispositif suivant la revendication 15, caractérisé en ce que les électrodes précitées (9) sont constituées par une série de fils conducteurs s'étendant à une certaine distance l'un de l'autre le long du plan suivant lequel le substrat peut défiler à travers l'enceinte, ces fils étant écartés des parois de l'enceinte (2) opposées à ce plan en permettant le passage de la poudre pouvant se déplacer par gravité à travers cette enceinte.
- Dispositif suivant l'une quelconque des revendications 12 à 16, caractérisé en ce que des moyens (8') sont prévus pour recycler la poudre collectée au bas de l'enceinte qui n'aurait pas été appliquée sur le substrat (1).
- Dispositif suivant la revendication 17, caractérisé en ce que les fils conducteurs présentent un diamètre de 100 à 250 microns.
- Dispositif suivant l'une quelconque des revendications 12 à 18, caractérisé en ce que l'appareil d'alimentation (10) comprend une trémie (11) montée au-dessus d'un cylindre (12) pouvant tourner autour d'un axe sensiblement horizontal (13) et présentant en son fond une ouverture (16) contre laquelle est agencée la surface du cylindre (12), cette surface étant pourvue d'organes d'entraínement (15), tels que des picots métalliques, de manière à permettre, lors de la rotation du cylindre (12) autour de son axe (13), de retirer, par l'ouverture précitée (16), une quantité dosée de poudre (5) contenue dans la trémie (11) sur la surface cylindrique du cylindre (12), une brosse rotative (17) étant prévue pour permettre d'enlever d'une manière continue la poudre de la surface cylindrique susdite.
- Dispositif suivant la revendication 19, caractérisé en ce que l'axe de rotation (18) de la brosse (17) est situé sensiblement au même niveau que celui de l'axe de rotation (13) du cylindre (12), cette brosse (17) présentant des picots relativement rigides (20) s'étendant jusqu'à la surface du cylindre (12) au moment où ils se trouvent sensiblement dans le plan passant par les axes de rotation (13) et (18).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
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. |
BE9800367 | 1998-05-14 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0956909A1 EP0956909A1 (fr) | 1999-11-17 |
EP0956909B1 true EP0956909B1 (fr) | 2003-03-05 |
Family
ID=3891248
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98870128A Expired - Lifetime EP0956909B1 (fr) | 1998-05-14 | 1998-06-05 | Procédé et dispositif pour l'application électrostatique en continu d'une substance en poudre sur un substrat |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0956909B1 (fr) |
AT (1) | ATE233609T1 (fr) |
BE (1) | BE1011917A6 (fr) |
DE (1) | DE69811858T2 (fr) |
ES (1) | ES2193506T3 (fr) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4954669A (en) | 1989-01-25 | 1990-09-04 | W. L. Gore & Associates, Inc. | Coaxial cable connector assembly |
BE1013690A3 (fr) * | 2000-09-19 | 2002-06-04 | Cockerill Rech & Dev | Dispositif d'application electrostatique de poudre de revetement. |
ES2317140T3 (es) | 2005-02-10 | 2009-04-16 | Demo Consult Sprlu | Instalacion y metodo para el recubrimiento electostatico en continuo de sustratos con polvo. |
FI125920B (en) * | 2013-09-09 | 2016-04-15 | Beneq Oy | A method of coating a substrate |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT243954B (de) * | 1963-07-17 | 1965-12-10 | Jan Gunnar Myhre | Vorrichtung zur kontinuierlichen Beschichtung von profilierten bzw. gelochten Bändern aus Metall mit Kunststoff |
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 |
AU2590195A (en) * | 1994-05-26 | 1995-12-21 | Electrostatic Technology, Inc. | Vertical electrostatic coater having vortex effect |
-
1998
- 1998-05-14 BE BE9800367A patent/BE1011917A6/fr active
- 1998-06-05 EP EP98870128A patent/EP0956909B1/fr not_active Expired - Lifetime
- 1998-06-05 DE DE69811858T patent/DE69811858T2/de not_active Expired - Fee Related
- 1998-06-05 ES ES98870128T patent/ES2193506T3/es not_active Expired - Lifetime
- 1998-06-05 AT AT98870128T patent/ATE233609T1/de not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
ES2193506T3 (es) | 2003-11-01 |
DE69811858T2 (de) | 2004-03-04 |
EP0956909A1 (fr) | 1999-11-17 |
DE69811858D1 (de) | 2003-04-10 |
ATE233609T1 (de) | 2003-03-15 |
BE1011917A6 (fr) | 2000-03-07 |
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