WO1991012083A1 - Device for providing homogeneity, uniformity and controllability of the electrostatic deposition of liquids or powders on ungrounded substrates in a high-voltage generator - Google Patents

Device for providing homogeneity, uniformity and controllability of the electrostatic deposition of liquids or powders on ungrounded substrates in a high-voltage generator Download PDF

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Publication number
WO1991012083A1
WO1991012083A1 PCT/FR1991/000079 FR9100079W WO9112083A1 WO 1991012083 A1 WO1991012083 A1 WO 1991012083A1 FR 9100079 W FR9100079 W FR 9100079W WO 9112083 A1 WO9112083 A1 WO 9112083A1
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WO
WIPO (PCT)
Prior art keywords
electrode
width
counter
electrodes
high voltage
Prior art date
Application number
PCT/FR1991/000079
Other languages
French (fr)
Inventor
Pierre De Mouveaux
Original Assignee
Pierre De Mouveaux
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 Pierre De Mouveaux filed Critical Pierre De Mouveaux
Publication of WO1991012083A1 publication Critical patent/WO1991012083A1/en

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Classifications

    • A—HUMAN NECESSITIES
    • A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
    • A23B—PRESERVING, e.g. BY CANNING, MEAT, FISH, EGGS, FRUIT, VEGETABLES, EDIBLE SEEDS; CHEMICAL RIPENING OF FRUIT OR VEGETABLES; THE PRESERVED, RIPENED, OR CANNED PRODUCTS
    • A23B4/00—General methods for preserving meat, sausages, fish or fish products
    • A23B4/044—Smoking; Smoking devices
    • A23B4/056—Smoking combined with irradiation or electric treatment, e.g. electrostatic smoking ; Apparatus therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/16—Arrangements for controlling delivery; Arrangements for controlling the spray area for controlling the spray area
    • 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
    • B05B5/087—Arrangements of electrodes, e.g. of charging, shielding, collecting electrodes
    • 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
    • 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
    • B05B5/082—Plant for applying liquids or other fluent materials to objects characterised by means for supporting, holding or conveying the objects
    • B05B5/084—Plant for applying liquids or other fluent materials to objects characterised by means for supporting, holding or conveying the objects the objects lying on, or being supported above conveying means, e.g. conveyor belts

Definitions

  • the present invention relates to a device for
  • Electrostatic spraying of liquids or powders so as to obtain a homogeneous and controlled deposit of these fluids. Electrostatic spraying of liquids or powders usually used does not present any great difficulties because the parts to be coated are directly connected to ground and earth, and are generally re ⁇ covered with a large thickness of material, with tol 'rancid E- very wide, being either decoration or protective layers of the atmospheric corrosion with inexpensive products.
  • the layer has a smaller thickness above the atomizer, that is to say symmetrical thickness differences with respect to the central axis of transfer.
  • part of the pulverized product is sprayed outside the conveyor belt or over an excessive width on this belt.
  • REPLACEMENT SHEET a ring in the shape of a crown. This, by the transla ⁇ tion of the strip, generates a track whose middle presents a weakness of thickness and whose edges have a heterogeneity of deposit. In addition, the width of the impact is largely related to the size of the electrode.
  • the device according to the invention overcomes this drawback. It has in fact several elements which, taken together or separately, avoid the difficulties described above.
  • a closed spray chamber (1) (Fig. 1, 2, 3) consisting of walls of electrically insulating material, lined on the outside with metal plates in the form of a Faraday cage, circulates in the direction of the arrow (Fig. 1), or the opposite direction, a strip of paper (2) or of insulating material but capable of retaining enough moisture in the air to be slightly conductive.
  • This strip of transfer paper (2) is generally guided by two small side panels located in the spray chamber. In their place are fixed on the insulating bottom (1) of the spraying chamber, no longer guides, but partitions (3) whose height exceeds the level of the rotary atomizer (13) and which are made of insulating material. so that the high voltage emitted by the generator (14) charges them electrically, and their length is substantially the same as that of the electrodes.
  • partitions are made of material compatible with organic solvents in general, and they are easily removable for possible cleaning.
  • These partitions then charged by the high voltage have the effect of holding together the drops of the product sprayed by the atomizer (13). This electrical repulsion is due to the similarity of the polarities.
  • These lateral partitions installed near the edges of the conveyor belt can be completed with two transverse partitions (19) of the same height and of the same material, but notched to allow the passage of the conveyor belt and of the parts.
  • the whole device is, with these repulsion partitions, composed of: a pneumatic turbine (16) for driving the atomizer at high speed (13), a high voltage generator (14) connected to the atomizer (13) by the turbine (16) and isolated from the mass of the spray chamber, and from the opposite pole of the high-voltage generator, of an electrode (4), the sprayer and electrostatic field part being already known, constituted of two grid metal surfaces, the part closest to the axis of symmetry in their arrangement is made in the form of a comb in order to allow their nesting and to maintain a sufficient metal mass over the entire surface despite the movement of separation of these two electrode halves when the desired width is adjusted to act on the width of the electrostatic field, and situated in opposition under the conveyor belt (2), of two plates of insulating material on which are f ixed these metal grids (4), a device with two worms with inverted pitch of insulating material (5) and nuts (6) fixed to the plates (8) electrode holders (4).
  • the screws (5) are fixed to the cage (1) so that the rotation by the wheel (7) of the screws (5) integral with one another causes the two electrodes to move apart or to come together ( 4) whose comb shape (Fig. 1/3) allows the movement of the plates without removing a metallic surface under the strip (2).
  • the width of the electrodes (4) can usefully be checked by means of two pneumatic cylinders, with or without rods, the moving parts of which act in opposition are fixed to the plates (8).
  • the use of pneumatic cylinders makes the system automatic without electrical isolation. If two endless screws (5) are used, their rotation can be controlled by an electric motor, but this must be electrically isolated from the electrodes.
  • the electrode grids (4) are arranged symmetrically, their axis of separation or approximation being perpendicular to the axis of translation of the strip and situated in the same plane. Their arrangement on the plates (8) and
  • REPLACEMENT SHEET the bottom (1) will determine a cross (Fig. 1), that is to say that the corners of the grids (4) become sharp angles whose value of the sides is about a quarter of the total length of the electrode .
  • the proportions of the branches of the cross may vary depending on the behavior of the different sprayed products.
  • These electrodes are connected to the ground (9) of the metal cage of the spraying chamber, to the earth and to the second pole of the high voltage generator.
  • the upper part of the device consists of the high voltage generator (14), the turbine (16), the atomizer (13), of a counter-electrode (12) made up of metal rods.
  • this counter-electrode is composed of two parts arranged symmetrically with respect to the axis of trans ⁇ lation of the conveyor belt and is produced with re-entrant angles of a dimension of approximately a quarter of the total length of the counter-electrode.
  • the electrode is made in the shape of a cross: the proportions of the branches of this cross can vary depending on the behavior of the different sprayed products.
  • the two parts (12) of the counter-electrode can slide on the rods (11) and be blocked by the tabs and the screws (10). The mobile assembly of the two parts is ensured by the necks! isseaux (15).
  • the support rods (11) were usefully arranged with two pneumatic cylinders (18) of low strength but with suitable stroke, of small section, but with long rods located between the turbine and the frames, these being fixed to the rod of the cylinder or their extension, to allow automatic adjustment of the effective width of this counter-electrode (12) to respect the equiva ⁇ slow variation of the width of the electrode (4).
  • the width of the electrode and the counter electrode can thus be varied remotely at the same time, by means of a device characterized in that, at the entrance to the spraying chamber, the width of the substrate on which
  • REPLACEMENT SHEET must be deposited the sprayed product is measured by detectors which can be mechanical, inductive, capacitive, with compressed air, light or infrared so as to act automatically, thanks to the electrical or pneumatic systems of displacement of the electrode and against -electrode, and to adjust these to the width of the substrate to be treated while acting on the height of the atomizer with respect to the conveyor belt, and on the flow rate of the product pumps to compensate for the greatest or lowest width of the product spray track.
  • detectors can be mechanical, inductive, capacitive, with compressed air, light or infrared so as to act automatically, thanks to the electrical or pneumatic systems of displacement of the electrode and against -electrode, and to adjust these to the width of the substrate to be treated while acting on the height of the atomizer with respect to the conveyor belt, and on the flow rate of the product pumps to compensate for the greatest or lowest width of the product spray track.

Abstract

A device for providing homogeneity, uniformity and controllability of the electrostatic deposition of liquids or powders on ungrounded substrates in a high-voltage generator. The device comprises a spraying apparatus (13), a cross-shaped counter-electrode (12) having adjustable dimensions which repel the high voltage droplets of the products, an adjustable cross-shaped electrode (4) located underneath the conveyor belt for the pieces to be coated, and vertical walls (3 and 19) made of insulating material and located on either side of the spraying apparatus and above the rotating portion (13) thereof. The electrode and the counter-electrode can be remotely and automatically controlled. The device is designed particularly for the manufacture of electronic components and printed circuits.

Description

DISPOSITIF POUR RENDRE HOMOGENE, REGULIER, ET CONTROLABLE LE DEPOT ELECTROSTATIQUE DE LIQUIDES OU DE POUDRES SUR DES SUBSTRATS NON MIS A LA MASSE D'UN GENERATEUR DE HAUTE- TENSIONDEVICE FOR MAKING HOMOGENEOUS, REGULAR, AND CONTROLLABLE THE ELECTROSTATIC DEPOSITION OF LIQUIDS OR POWDERS ON SUBSTRATE NOT EARTHED BY A HIGH VOLTAGE GENERATOR
La présente invention concerne un dispositif pourThe present invention relates to a device for
1 ',uti 1 i sation de la pulvérisation électrostatique de liqui¬ des ou de poudres de façon à obtenir un dépôt homogène et contrôlé de ces fluides. La pulvérisation électrostatique des liquides ou des poudres utilisée habituellement ne présente pas de grandes difficultés car les pièces à enduire sont connectées direc¬ tement à la masse et à la terre, et sont généralement re¬ couvertes d'une forte épaisseur de matière, avec des tol'é- rances très larges, puisqu'il s'agit soit de décor, soit de couches de protection de la corrosion atmosphérique avec des produits peu coûteux.1 ', use of the electrostatic spraying of liquids or powders so as to obtain a homogeneous and controlled deposit of these fluids. Electrostatic spraying of liquids or powders usually used does not present any great difficulties because the parts to be coated are directly connected to ground and earth, and are generally re¬ covered with a large thickness of material, with tol 'rancid E- very wide, being either decoration or protective layers of the atmospheric corrosion with inexpensive products.
Par contre lorsqu'on veut déposer des couches fines, par exemple variables de soixante-dix microns à moins de un micron, de produits destinés à la fabrication de com¬ posants électroniques ou de circuits imprimés, ou d'autres pièces fines, on utilise le procédé du dépôt électrosta¬ tique horizontal de liquide, comme cela est décrit dans le brevet français N° 84.14475 et le brevet européen N° 0195041.On the other hand when one wants to deposit thin layers, for example variable from seventy microns to less than one micron, of products intended for the manufacture of electronic components or printed circuits, or of other fine parts, one uses the process of horizontal electrostatic deposit of liquid, as described in French patent No. 84.14475 and European patent No. 0195041.
Avec l 'utilisation du procédé horizontal de dépôt électrostatique comportant un transfert à bande et une électrode sous cette bande, on obtient des couches minces de produits difficiles à déposer par d'autres méthodes qui, en outre, donnent des performances moindres.With the use of the horizontal method of electrostatic deposition comprising a band transfer and an electrode under this band, thin layers of products are obtained which are difficult to deposit by other methods which, moreover, give poorer performance.
Cependant, la couche présente une plus faible épais¬ seur à la verticale de l'atomiseur, c'est à dire des dif¬ férences d'épaisseur symétriques par rapport à l 'axe cen¬ tral de transfert. En outre, une partie du produit pulvé- risé est projetée â l 'extérieur de la bande transporteuse ou sur une largeur trop importante sur cette bande.However, the layer has a smaller thickness above the atomizer, that is to say symmetrical thickness differences with respect to the central axis of transfer. In addition, part of the pulverized product is sprayed outside the conveyor belt or over an excessive width on this belt.
La forme de l 'impact sur le papier qui transporte les pièces au-dessus de l'électrode est représentée parThe shape of the impact on the paper which transports the parts above the electrode is represented by
FEUILLE DE REMPLACEMENT un anneau en forme de couronne. Celui-ci, par la transla¬ tion de la bande, engendre une piste dont le milieu présen¬ te une faiblesse d'épaisseur et dont les bords présentent une hétérogénéité de dépôt. En outre, la largeur de l 'impact est pour une grande part liée à la dimension de l 'électrode. Le dispositif selon l'invention permet de remédier à cet inconvénient. Il comporte en effet plusieurs éléments qui, pris emsemble ou séparément, évitent les difficultés précédemment décrites. Dans une enceinte qui est une chambre de pulvérisa¬ tion fermée (1) (Fig. 1, 2, 3) constituée de parois en ma¬ tériau isolant électriquement, doublées à l'extérieur de plaques métalliques en forme de cage de Faraday, on fait circuler suivant le sens de la flèche (Fig. 1), ou le sens opposé, une bande de papier (2) ou de matière isolante mais susceptible de retenir assez d'humidité de l 'air pour être légèrement conductrice.REPLACEMENT SHEET a ring in the shape of a crown. This, by the transla¬ tion of the strip, generates a track whose middle presents a weakness of thickness and whose edges have a heterogeneity of deposit. In addition, the width of the impact is largely related to the size of the electrode. The device according to the invention overcomes this drawback. It has in fact several elements which, taken together or separately, avoid the difficulties described above. In an enclosure which is a closed spray chamber (1) (Fig. 1, 2, 3) consisting of walls of electrically insulating material, lined on the outside with metal plates in the form of a Faraday cage, circulates in the direction of the arrow (Fig. 1), or the opposite direction, a strip of paper (2) or of insulating material but capable of retaining enough moisture in the air to be slightly conductive.
Cette bande de papier transfert (2) est généralement guidée par deux petits panneaux latéraux situés dans la chambre de pulvérisation. A leur place sont fixées sur le fond isolant (1) de la chambre de pulvérisation, non plus des guides, mais des cloisons (3) dont la hauteur dépasse le niveau de l 'atomiseur rotatif (13) et qui sont constituées de matière isolante de façon à ce que la haute tension ëmi - se par le générateur (14) les charge électriquement, et leur longueur est sensiblement la même que celle des élec¬ trodes. Ces cloisons sont en matière compatible avec les solvants organiques en général, et elles sont amovibles facilement pour un éventuel nettoyage. Ces cloisons alors chargées par la haute tension ont pour effet de maintenir entre elles les gouttes du produit pulvérisé par l 'atomiseur (13). Cette répulsion électrique est due à la similitude des polarités. Ces cloisons laté¬ rales installées près des bords de la bande transporteuse peuvent être complétées de deux cloisons transversales (19) de même hauteur et de même matière, mais échancrées pour permettre le passage de la bande transporteuse et des piè¬ ces .This strip of transfer paper (2) is generally guided by two small side panels located in the spray chamber. In their place are fixed on the insulating bottom (1) of the spraying chamber, no longer guides, but partitions (3) whose height exceeds the level of the rotary atomizer (13) and which are made of insulating material. so that the high voltage emitted by the generator (14) charges them electrically, and their length is substantially the same as that of the electrodes. These partitions are made of material compatible with organic solvents in general, and they are easily removable for possible cleaning. These partitions then charged by the high voltage have the effect of holding together the drops of the product sprayed by the atomizer (13). This electrical repulsion is due to the similarity of the polarities. These lateral partitions installed near the edges of the conveyor belt can be completed with two transverse partitions (19) of the same height and of the same material, but notched to allow the passage of the conveyor belt and of the parts.
FEUILLE DE «EMPLACEMENT L'ensemble du dispositif est, avec ces cloisons de répulsion, composé de : une turbine pneumatique (16) d'entraînement à haute vitesse de l 'atomiseur (13), d'un générateur de haute tension (14) relié à l 'atomiseur (13) par la turbine (16) et isolés de la masse de la chambre de pulvérisation, et du pôle opposé du générateur de haute tension, d'une électrode (4), la partie pulvérisateur et champ électrostatique étant déjà connue, constituée de deux surfaces métalliques en grille dont la partie la plus proche de l 'axe de symétrie dans leur disposition est réa¬ lisée en forme de peigne afin de permettre leur imbrication et conserver une masse métalliques suffisante sur toute la surface malgré le mouvement d'écartement de ces deux moitiés d'électrode lorsqu'on règle la largeur désirée pour agir sur la largeur du champ électrostatique, et situées en opposi¬ tion sous la bande transporteuse (2), de deux plaques de matière isolante sur lesquelles sont fixées ces grilles mé¬ talliques (4), d'un dispositif à deux vis sans fin à pas inversé en matière isolante (5) et d'écrous (6) fixés aux plaques (8) porte-électrodes (4). Les vis (5) sont fixées à la cage (1 ) de telle sorte que la rotation par la roue (7) des vis (5) solidaires l 'une de l 'autre provoque l 'écarte ent ou le rapprochement des deux électrodes (4) dont la forme de peigne (Fig. 1/3) permet le mouvement des plaques sans supprimer de surface métalliques sous la bande (2). Le contrôle de la largeur des électrodes (4) peut utilement s'effectuer au moyen de deux vérins pneumatiques, avec ou sans tige, dont les parties mobiles agissant en opposition sont fixées aux plaques (8). L'utilisation de vérins pneumatiques permet de rendre le système automatique sans isolation électrique. Dans le cas d'utilisation de deux vis sans fin (5), l 'asservissement de leur rotation peut être effectué par un moteur électrique, mais celui-ci doit être isolé électriquement des électrodes. Les grilles-électrodes (4) sont disposées symétrique¬ ment, leur axe d ' éloi gnement ou de rapprochement étant per- pendiculaire à l 'axe de translation de la bande et situé dans le même plan. Leur disposition sur les plaques (8) etSITE SHEET The whole device is, with these repulsion partitions, composed of: a pneumatic turbine (16) for driving the atomizer at high speed (13), a high voltage generator (14) connected to the atomizer (13) by the turbine (16) and isolated from the mass of the spray chamber, and from the opposite pole of the high-voltage generator, of an electrode (4), the sprayer and electrostatic field part being already known, constituted of two grid metal surfaces, the part closest to the axis of symmetry in their arrangement is made in the form of a comb in order to allow their nesting and to maintain a sufficient metal mass over the entire surface despite the movement of separation of these two electrode halves when the desired width is adjusted to act on the width of the electrostatic field, and situated in opposition under the conveyor belt (2), of two plates of insulating material on which are f ixed these metal grids (4), a device with two worms with inverted pitch of insulating material (5) and nuts (6) fixed to the plates (8) electrode holders (4). The screws (5) are fixed to the cage (1) so that the rotation by the wheel (7) of the screws (5) integral with one another causes the two electrodes to move apart or to come together ( 4) whose comb shape (Fig. 1/3) allows the movement of the plates without removing a metallic surface under the strip (2). The width of the electrodes (4) can usefully be checked by means of two pneumatic cylinders, with or without rods, the moving parts of which act in opposition are fixed to the plates (8). The use of pneumatic cylinders makes the system automatic without electrical isolation. If two endless screws (5) are used, their rotation can be controlled by an electric motor, but this must be electrically isolated from the electrodes. The electrode grids (4) are arranged symmetrically, their axis of separation or approximation being perpendicular to the axis of translation of the strip and situated in the same plane. Their arrangement on the plates (8) and
FEUILLE DE REMPLACEMENT le fond (1) déterminera une croix (Fig. 1), c'est à dire que les coins des grilles (4) deviennent des angles ren¬ trants dont la valeur des côtés est environ du quart de la longueur totale de l 'électrode. Les proportions des branches de la croix peuvent varier suivant le comportement des différents produits pulvérisés. Ces électrodes sont reliées à la masse (9) de la cage métallique de la chambre de pul¬ vérisation, à la terre et au deuxième pôle du générateur de haute tension. La partie supérieure du dispositif est constituée avec la générateur (14) de haute tension, la turbine (16), l 'atomiseur (13), d'une contre-électrode (12) constituée de tiges métalliques.REPLACEMENT SHEET the bottom (1) will determine a cross (Fig. 1), that is to say that the corners of the grids (4) become sharp angles whose value of the sides is about a quarter of the total length of the electrode . The proportions of the branches of the cross may vary depending on the behavior of the different sprayed products. These electrodes are connected to the ground (9) of the metal cage of the spraying chamber, to the earth and to the second pole of the high voltage generator. The upper part of the device consists of the high voltage generator (14), the turbine (16), the atomizer (13), of a counter-electrode (12) made up of metal rods.
Comme pour l 'électrode, et sensiblement de mêmes di- mensions, cette contre-électrode est composée de deux par¬ ties disposées symétriquement par rapport à l 'axe de trans¬ lation de la bande transporteuse et est réalisée avec des angles rentrants d'une dimension environ du quart de la lon¬ gueur totale de la contre-électrode. De même que l 'électrode, elle est réalisée en forme de croix : les proportions des branches de cette croix peuvent varier suivant le compor¬ tement des différents produits pulvérisés. Les deux par¬ ties (12) de la contre-électrode peuvent coulisser sur les tiges (11) et être bloquées par les pattes et les vis (10). L'assemblage mobile des deux parties est assurée par les cou! isseaux (15).As for the electrode, and substantially of the same dimensions, this counter-electrode is composed of two parts arranged symmetrically with respect to the axis of trans¬ lation of the conveyor belt and is produced with re-entrant angles of a dimension of approximately a quarter of the total length of the counter-electrode. Like the electrode, it is made in the shape of a cross: the proportions of the branches of this cross can vary depending on the behavior of the different sprayed products. The two parts (12) of the counter-electrode can slide on the rods (11) and be blocked by the tabs and the screws (10). The mobile assembly of the two parts is ensured by the necks! isseaux (15).
On a utilement aménagé les tiges support (11) avec deux vérins pneumatiques (18) de faible force mais à course convenable, de faible section, mais à tiges longues situés entre la turbine et les cadres, ceux-ci étant fixés à la tige du vérin ou à leur prolongement, pour permettre l'ajustement automatique de la largeur effective de cette contre-électrode (12) pour respecter la variation équiva¬ lente de la largeur de l 'électrode (4). On peut ainsi à distance faire varier en même temps la largeur de l 'électrode et de la contre-électrode, grâce à un dispositif caractérisé en ce que à l 'entrée de la chambre de pulvérisation, la largeur du substrat sur lequelThe support rods (11) were usefully arranged with two pneumatic cylinders (18) of low strength but with suitable stroke, of small section, but with long rods located between the turbine and the frames, these being fixed to the rod of the cylinder or their extension, to allow automatic adjustment of the effective width of this counter-electrode (12) to respect the equiva¬ slow variation of the width of the electrode (4). The width of the electrode and the counter electrode can thus be varied remotely at the same time, by means of a device characterized in that, at the entrance to the spraying chamber, the width of the substrate on which
FEUILLE DE REMPLACEMENT doit être déposé le produit pulvérisé est mesurée par des dé¬ tecteurs qui peuvent être mécaniques, inductifs, capacitifs, à air comprimé, lumineux ou à infrarouges de façon à agir automatiquement, grâce aux systèmes électriques ou pneuma- tiques de déplacement des électrode et contre-électrode, et d'ajuster celles-ci à la largeur du substrat à traiter tout en agissant sur la hauteur de l 'atomiseur par rapport à la bande transporteuse, et sur le débit des pompes de produits pour compenser la plus grande ou plus faible largeur de la piste de produit à pulvériser.REPLACEMENT SHEET must be deposited the sprayed product is measured by detectors which can be mechanical, inductive, capacitive, with compressed air, light or infrared so as to act automatically, thanks to the electrical or pneumatic systems of displacement of the electrode and against -electrode, and to adjust these to the width of the substrate to be treated while acting on the height of the atomizer with respect to the conveyor belt, and on the flow rate of the product pumps to compensate for the greatest or lowest width of the product spray track.
Puisqu'on sait déjà faire varier la hauteur de l 'atomiseur (13) par rapport à la bande transporteuse (2), on peut par l 'ajustement du débit des pompes d'alimentation (17) en produit à pulvériser obtenir des dépôts d'épaisseur recherchées sur des largeurs contôlées.Since it is already known to vary the height of the atomizer (13) relative to the conveyor belt (2), it is possible by adjusting the flow rate of the supply pumps (17) of product to be sprayed to obtain deposits of 'thickness sought on controlled widths.
La combinaison des parois verticales (3) qui main¬ tiennent le champ électrostatique, de l 'électrode (4) qui ferme le champ électrostatique, de la contre-électrode (12) qui oriente préférentiel lement le champ électrostatique par sa liaison à la turbine, donc à la haute tension, associée â la forme en croix décrite plus haut, permet d'obtenir sur une surface bien définie un impact de produit déposé qui a la forme légèrement arrondie des croix constituées par l 'électrode et la contre-électrode. Lorsque cette forme d'image sur le papier est produite pendant que le papier transfert avance, on obtient avec des bords très nets une piste de produit déposé dont l 'épaisseur est régulière sur toute la largeur avec précisément une largeur choisie. Le but recherché d'un dépôt homogène avec une largeur précise et contrôlable allié à une économie de produit est atteint par l 'utilisation du dispositif objet de l 'invention.The combination of vertical walls (3) which hold the electrostatic field, the electrode (4) which closes the electrostatic field, the counter-electrode (12) which preferentially orient the electrostatic field by its connection to the turbine. , therefore with high voltage, associated with the cross shape described above, makes it possible to obtain on a well defined surface an impact of deposited product which has the slightly rounded shape of the crosses formed by the electrode and the counter electrode. When this form of image on the paper is produced while the transfer paper is advancing, there is obtained with very sharp edges a track of deposited product whose thickness is regular over the entire width with precisely a chosen width. The aim of a homogeneous deposit with a precise and controllable width combined with product savings is achieved by using the device that is the subject of the invention.
FEUILLE DE REMPLACEMENT REPLACEMENT SHEET

Claims

REVENDICATIONS
1. Dispositif pour l 'utilisation de la pulvérisation électrostatique horizontale de liquides ou de poudres de façon à obtenir un dépôt homogène et contrôlé sur des sub¬ strats non mis à la masse d'un générateur de haute tension. Ce dispositif est caractérisé par le fait que dans un en¬ semble pulvérisateur rotatif vertical à très haute vitesse alimenté en courant haute tension et à transport par bande transporteuse au-dessus d'une électrode, procédé déjà connu, on a disposé, de part et d'autre de cette bande transpor- teuse (2) et du générateur, des cloisons en matière isolan¬ te (3) et (19) plus hautes que 1 ' atomi seur (13) et destinées à être chargées par la haute tension du générateur (14) pour repousser les goutelettes chargées par cette même haute tension et produite par le pulvéri sateur, qu'on a disposé autour du pulvérisateur et parallèlement à la bande trans¬ porteuse (2) une contre-électrode métallique (12) destinée à agir sur le champ électrostatique du fait de sa connection à la haute tension (14), qu'on a réalisé l'électrode (4) en grille métallique et la contre-électrode (12) en tiges mé- talliques, chacune en deux parties symétriques par rapport à l 'axe du transfert de la bande (2) de façon à pouvoir augmenter ou réduire la largeur de l 'électrode et de la contre-électrode et agir sur la largeur de l 'impact de pro¬ duit pulvérisé, qu'on a réalisé ces électrode et contre- électrode symétriques en forme de croix; c'est à dire que les coins de ces éléments forment des angles rentrants pour réaliser cette forme de croix, et qu'on a réalisé un systè¬ me automatique d'ajustement de ces électode et contre- électrode métalliques. Les proportions des branches de la croix peuvent varier suivant le comportement des différents produits pulvérisés.1. Device for the use of horizontal electrostatic spraying of liquids or powders so as to obtain a uniform and controlled deposit on ungrounded substrates of a high voltage generator. This device is characterized by the fact that in a very high-speed vertical rotary sprayer supplied with high-voltage current and transported by a conveyor belt over an electrode, a process already known, we have arranged, on the part and on the other side of this conveyor belt (2) and of the generator, partitions made of insulating material (3) and (19) higher than the atomizer (13) and intended to be charged by the high voltage of the generator (14) for repelling the droplets charged by this same high voltage and produced by the sprayer, which is placed around the sprayer and parallel to the carrier strip (2) a metal counter-electrode (12) intended for act on the electrostatic field due to its connection to the high voltage (14), that the electrode (4) has been made of a metal grid and the counter-electrode (12) of metal rods, each in two parts symmetrical with respect to the axis of the transfer of the strip (2) so as to be able to increase or reduce the width of the electrode and of the counter-electrode and act on the width of the impact of the sprayed product, which has been produced these symmetrical cross-shaped electrode and counter-electrode; that is to say that the corners of these elements form re-entrant angles in order to produce this form of cross, and that an automatic system for adjusting these metal electrode and counter electrode has been produced. The proportions of the branches of the cross may vary depending on the behavior of the different sprayed products.
2. Dispositif selon la revendication 1 caractérisé en ce que les cloisons en matière isolante sont plus hautes que la partie tournante de l'atomiseur et que leur longueur est sensiblement la même que celle des électrodes et que ces cloisons sont en matière compatible avec les solvants orga¬ niques en général, et qu'elle sont amovibles facilement pour un éventuel nettoyage.2. Device according to claim 1 characterized in that the partitions made of insulating material are higher than the rotating part of the atomizer and that their length is substantially the same as that of the electrodes and that these partitions are made of material compatible with solvents orga ¬ lunches in general, and it is easily removable for possible cleaning.
3. Dispositif selon la revendication 1 caracté¬ risé en ce que les électrodes symétriques, en forme de croix, situées sous la bande transporteuse sont consti¬ tuées de grilles métalliques dont la partie la plus pro¬ che de l 'axe de symétrie dans leur disposition est réali¬ sée en forme de peigne afin de permettre leur imbrication et conserver une masse métallique suffisante sur toute la surface malgré le mouvement d'écartement de ces deux moi¬ tiés d'électrode lorsqu'on règle la largeur désirée pour agir sur la largeur du champ électrostatique.3. Device according to claim 1 caracté¬ ized in that the symmetrical electrodes, in the shape of a cross, located under the conveyor belt are consti¬ killed by metal grids, the part closest to the axis of symmetry in their arrangement is made in the form of a comb in order to allow their nesting and to maintain a sufficient metallic mass over the entire surface despite the spacing movement of these two parts of the electrode when the desired width is adjusted to act on the width of the electrostatic field.
4. Dispositif selon la revendication 1 caractérisé en ce que la contre-électrode en tiges métalliques et en forme de croix est fixée à la partie turbine à haute vi¬ tesse et reliée à la haute tension, et sa largeur peut être réglée manuellement pour s'adapter à la largeur de l 'électrode, ceci au moyen de pattes et vis de bloquage. Le guidage des variations de largeur est réalisé par des coulisseaux disposés symétriquement par rapport à l 'atomiseur et sur l 'axe de translation de la bande trans¬ porteuse.4. Device according to claim 1 characterized in that the counter-electrode in metal rods and in the shape of a cross is fixed to the turbine part at high speed and connected to the high voltage, and its width can be adjusted manually to s 'adapt to the width of the electrode, by means of lugs and locking screws. The width variations are guided by slides arranged symmetrically with respect to the atomizer and on the axis of translation of the carrier strip.
5. Dispositif selon les revendications 1 , 3 et 4 caractérisé en ce que l 'adaptation des largeurs des élec¬ trodes est automatisée par la disposition sous les deux moitiés d'électrode d'une vis sans fin à deux pas inver¬ sés depuis le milieu et tournant dans les pièces formant écrous et fixés au support de ces électrodes, tandis que la vis est tenue à la partie fixe du système. Le dépla¬ cement des électrodes étant produit par la rotation de la vis, actionné soit par ùnë roue manuelle, soit par un mo¬ teur électrique isolé.5. Device according to claims 1, 3 and 4 characterized in that the adaptation of the widths of the electrodes is automated by the arrangement under the two electrode halves of a worm screw with two steps inverted from the middle and turning in the parts forming nuts and fixed to the support of these electrodes, while the screw is held in the fixed part of the system. The displacement of the electrodes being produced by the rotation of the screw, actuated either by a manual wheel or by an isolated electric motor.
6. Dispositif selon la revendication 5 caractérisé en ce que le déplacement des supports des électrodes se fait au moyen de deux vérins pneumatiques qui peuvent être sans tiges et dont la partie mobile est fixée au support des électrodes.6. Device according to claim 5 characterized in that the displacement of the electrode supports is done by means of two pneumatic cylinders which can be without rods and whose movable part is fixed to the electrode support.
7. Dispositif selon les revendications* 1 et 4 carac¬ térisé en ce que le déplacement latéral des parties cadre des contre-électrodes est réalisé au moyen de vérins pneu-7. Device according to claims * 1 and 4 carac¬ terized in that the lateral displacement of the frame parts of the counter-electrodes is achieved by means of pneumatic cylinders
FEUILLE DE REMPLACEMENT atiques de faible section mais à tiges longues situés en¬ tre la turbine et les cadres, ceux-ci étant fixés à la tige du vérin ou à leur prolongement. Les vérins pneumatiques agissant symétriquement permettent, à distance, le rappro- chement ou l 'écartement des parties mobiles de ces contre- électrodes .REPLACEMENT SHEET Aticas of small section but with long rods located between the turbine and the frames, these being fixed to the rod of the jack or to their extension. The pneumatic cylinders acting symmetrically allow the moving parts of these counter-electrodes to be brought closer or apart from a distance.
8. Dispositif selon les revendications 1, 5, 6 et 7 caractérisé en ce que à l 'entrée de Ta chambre de pulvéri¬ sation, la largeur du substrat sur lequel doit être dépo- se le produit pulvérisé est mesurée par des détecteurs qui peuvent être mécaniques, inductifs, capacitifs, à air com¬ primé, lumineux ou à infrarouges de façon à agir automati¬ quement, grâce aux systèmes électriques ou pneumatiques de déplacement des électrode et contre-électrode, et d'ajuster celles-ci à la largeur du substrat à traiter tout en agis¬ sant sur la hauteur de l 'atomiseur par rapport à la bande transporteuse et sur le débit des pompes de produits pour compenser la plus grande ou plus faible largeur de la piste de produit à pulvériser.8. Device according to claims 1, 5, 6 and 7 characterized in that at the entrance of your spray chamber, the width of the substrate on which the sprayed product is to be deposited is measured by detectors which can be mechanical, inductive, capacitive, with compressed air, light or infrared so as to act automatically, thanks to the electrical or pneumatic systems for moving the electrode and counter electrode, and to adjust these to the width of the substrate to be treated while acting on the height of the atomizer relative to the conveyor belt and on the flow rate of the product pumps to compensate for the greater or lesser width of the track of product to be sprayed.
FEUILLE DE REMPLACEMENT REPLACEMENT SHEET
PCT/FR1991/000079 1990-02-06 1991-02-05 Device for providing homogeneity, uniformity and controllability of the electrostatic deposition of liquids or powders on ungrounded substrates in a high-voltage generator WO1991012083A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9001580A FR2657794A1 (en) 1990-02-06 1990-02-06 DEVICE FOR MAKING HOMOGENEOUS, REGULAR AND CONTROLLABLE THE ELECTROSTATIC DEPOSITION OF LIQUIDS OR POWDERS ON SUBSTRATE NOT EARTHED BY A HIGH VOLTAGE GENERATOR.
FR90/01580 1990-02-06

Publications (1)

Publication Number Publication Date
WO1991012083A1 true WO1991012083A1 (en) 1991-08-22

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EP3275559B1 (en) 2016-07-27 2021-09-15 Exel Industries Coating system with an ultrasonic spray head and electrostatic field

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WO1994014545A1 (en) * 1992-12-19 1994-07-07 Robert Bosch Gmbh Process for applying a coat of lacquer on a workpiece
WO2005018832A1 (en) * 2003-08-26 2005-03-03 Darren John Blade Coating method and apparatus

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