EP0375511A1 - Method and installation for applying a coating product - Google Patents

Method and installation for applying a coating product Download PDF

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Publication number
EP0375511A1
EP0375511A1 EP89403465A EP89403465A EP0375511A1 EP 0375511 A1 EP0375511 A1 EP 0375511A1 EP 89403465 A EP89403465 A EP 89403465A EP 89403465 A EP89403465 A EP 89403465A EP 0375511 A1 EP0375511 A1 EP 0375511A1
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EP
European Patent Office
Prior art keywords
enclosure
coating product
frame
installation according
powder
Prior art date
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Granted
Application number
EP89403465A
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German (de)
French (fr)
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EP0375511B1 (en
Inventor
Michel Gondrand
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Sames SA
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Sames SA
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Publication of EP0375511A1 publication Critical patent/EP0375511A1/en
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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
    • B05B16/00—Spray booths
    • B05B16/40—Construction elements specially adapted therefor, e.g. floors, walls or ceilings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B16/00—Spray booths
    • B05B16/90—Spray booths comprising conveying means for moving objects or other work to be sprayed in and out of the booth, e.g. through the booth

Definitions

  • the invention relates to a method of applying a coating product such as in particular a hot-melt paint powder; it relates more particularly to an improvement making it possible to reduce the time necessary to change the coating product, that is to say most often to effect a change in color of the coating product, applied electrostatically.
  • a coating product such as in particular a hot-melt paint powder
  • the invention also relates to an installation for implementing the method.
  • the plastic sheets are passed between the rollers and the frame so as to have a clean internal surface.
  • the internal framework must be cleaned manually before unwinding of the plastic sheets and during the movement of the latter, the framework can be again soiled with powder deposited on the walls, which can then constitute a source of pollution of clean walls.
  • the solution is therefore not entirely satisfactory and it presupposes the use of complex mechanical means.
  • the operation is expensive, due to a certain consumption of plastic film and its implementation is delicate.
  • the invention provides a more economical solution and allows very rapid implementation.
  • the invention follows from the analysis according to which it is practically impossible to prevent by simple means the deposition of a part of the powder sprayed on the internal walls of the enclosure and that, on the other hand, any cleaning of the walls requires a long intervention (which therefore makes the installation unusable for a significant time) and the result of which is uncertain.
  • the basic idea of the invention therefore consists in purely and simply removing the enclosure at each change of coating product and replacing it with another, corresponding to the new coating product.
  • the invention therefore relates to a method of applying a coating product, in particular a powder, to objects to be covered, consisting in passing such objects through an enclosure and in projecting such a coating product.
  • a coating product in particular a powder
  • characteristics given to the objects during their passage through said enclosure characterized in that, an enclosure corresponding to a given coating product being detachably fixed to an external frame, a change of coating product comprises the operations consisting in depositing the enclosure in place and replace it with another enclosure corresponding to a new coating product chosen.
  • the enclosures are made of flexible material so that they can be folded up and stored in a minimum space.
  • the enclosure is deployed and takes its shape when it is attached to said frame, by external attachment means such as flexible links, possibly elastic.
  • the invention also relates to an installation for applying a coating product, characterized in that it comprises an external fixed frame and a plurality of enclosures, each enclosure being shaped and dimensioned so as to be able to be placed in said frame and attached to it to be supported by it.
  • the installation shown comprises a rigid, load-bearing frame 1 and an enclosure 2 made of flexible material, here made of plastic material such as polyethylene, deployed inside said frame and supported by it .
  • the installation comprises a plurality of enclosures 2, the other enclosures each corresponding to a particular coating product, being folded and stored while waiting to be used in place of the enclosure attached to said fixed frame 1.
  • This has approximately the shape of a rectangular parallelepiped materialized by an assembly of vertical uprights 1 a and horizontal crosspieces 1 b .
  • These elements are advantageously made of insulating material or covered with a thick layer of insulating material.
  • each enclosure When deployed, each enclosure has a shape similar to that of the frame, but of smaller dimensions and the enclosure in use is connected to the frame by flexible links 3, in this case here elastic tensioners .
  • These tensioners are provided with hooks 3 a which cooperate with connection rings 3 b defined or attached to selected points of the enclosure, in particular at its ends.
  • the enclosure 2 is constituted by panels of flexible plastic material assembled together edge to edge, for example by welding.
  • the enclosure is made up of four substantially vertical faces 2 a , 2 b , 2 c , 2 d , of two slightly inclined upper faces 2 e , 2 f and of four inclined lower faces 2 g , 2 h , 2 i , 2 d forming a hopper 10 terminated by a circular opening. Furthermore, the enclosure is provided with a wide opening 4 extending on the one hand, over its entire upper part between the faces 2 e and 2 f and extending by vertical notches on the opposite vertical faces 2 b and 2 c . This opening 4 allows the passage in translation of the objects 8 to be covered suspended from an overhead conveyor 9. The latter is arranged for transport the objects from one end to the other of the enclosure through the opening 4. This conveyor is moreover connected to the ground.
  • At least one other opening 5 is made, here in the face 2 d of the enclosure, for the passage of an electrostatic projection device 6 carried by a back-and-forth mechanism 7, located outside and which moves it vertically so that the powder jet sweeps the entire height of the objects 8 to be covered.
  • the opening 5 can simply consist of a simple slot cut on demand.
  • the cut parts can advantageously form lips for partially closing the opening 5.
  • the projection apparatus 6 is supplied with fluidized powder by a conduit 11 which is connected to a powder reservoir 12 in which the powder is kept at the fluidized state.
  • This tank is conventional and is not part of the invention. It is mounted on casters 15 so that it can be easily moved and changed when the user decides to change the coating product.
  • An electric generator 16 attached to the mechanism 7 supplies the projection apparatus 6 with electric energy by means of an electric cable 17.
  • the lower opening of the hopper 10 is connected by a quick-clamping collar 21 at the end of a conduit 19 connected to suction means not shown but conventional.
  • suction means include in particular a centrifugal separator or "cyclone".
  • the end of the duct 19 is fixed to the lower part of the frame by guy wires 20 or the like extending between the uprights of said frame and the end of the duct.
  • These guys 20 advantageously constitute a horizontal support which can be used for the folding operations of the enclosure after its use.
  • the enclosure is avoided to be cleaned at each change of coating product and the enclosure in use is replaced by another corresponding to the new coating product.
  • the coating products differ only in their color, the installation will include as many foldable speakers as there are colors.
  • Powder spraying is stopped and the mechanism 7 is immobilized in the low position.
  • the conduit 11 is disconnected from the reservoir 12 and clean air is injected therein to clean both the conduit 11 and the projection apparatus 6.
  • the enclosure 2 is shaken manually to drop most of the powder covering the walls in the hopper so that this powder is entrained towards the separator.
  • the elastic tensioners 3 are then lifted, starting from the top, which allows the enclosure to be folded over the shrouds 20.
  • the collar 21 is then opened, which completely frees the enclosure.
  • the separator is then cleaned; these operations are conventional.
  • the installation is then ready to receive another enclosure 2 corresponding to the new coating product contained in another powder reservoir 12.
  • the mounting of the new enclosure is carried out by a succession of reverse operations to those which have been described below. above.
  • the material making the enclosure will preferably be an insulating material, in order to limit the amount of powder deposited on the walls.
  • the quantity of powder liable to ignite will be relatively small and will give off little heat.
  • the use of thin and flexible sheets also increases safety in the event of ignition of the powder because the pressure cannot rise in the enclosure due to the deformation of the walls. This eliminates any risk of explosion of said enclosure.
  • the internal faces of the enclosure are at least partially conductive, for example weakly metallized, and connected to the ground.
  • the material used to make the enclosure can advantageously be translucent or transparent. This can be used to place a photoelectric flame detection cell 25 or similar means outside the enclosure, preferably facing a wall of this enclosure little exposed to the coating product. Thus, the cell can be placed opposite the wall 2 e or 2 f . It should be noted that this cell, which was conventionally placed inside the enclosure, was often covered with powder and poorly fulfilled its function.
  • enclosures of different shapes corresponding to different objects to be covered provided that the enclosures can be mounted inside the same frame with the anchoring points and the necessary attachment means.
  • FIG. 2 illustrates a variant of the enclosure provided with extensions extending laterally and / or at its upper part to form sorts of "airlocks". It is thus possible to limit the turbulence in the projection area and the leakage of powder particles in the room.
  • the external frame has not been shown but it is clear that the shape of this frame is adapted to the new shape of the enclosure. This breaks down into a projection chamber 30 and into two lateral chambers forming entry and exit "locks", 31, 32, which thus extend the lateral ends of the opening 4 shown in the embodiment of Figure 1.
  • the upper part of this opening, for the passage of object supports, is also extended upwards by a longitudinal "airlock" 33.
  • the lower parts of "airlocks 31 and 32 meet at the hopper.
  • the projection chamber 30 has an opening 35 allowing access for the operator handling, here, a manual projector.

Abstract

Changing of a coating product in an installation for spraying powder. <??>According to the invention, the powder-spraying enclosure (2) is mounted inside a rigid framework (1) and supported by this framework by means of flexible links (3) such as elastic tensioning devices; the enclosure, preferably made from flexible material, being easily replaced with another each time the coating product is changed. <??>Application to the spraying of heat-fusible powder paint. <IMAGE>

Description

L'invention concerne un procédé d'application d'un produit de revêtement tel que notamment une poudre thermofusible de peinture; elle concerne plus particulièrement un perfectionnement permettant de diminuer le temps nécessaire pour changer de produit de revêtement, c'est-à-dire le plus souvent pour réaliser un changement de couleur du produit de revêtement, appliqué par voie électrostatique.The invention relates to a method of applying a coating product such as in particular a hot-melt paint powder; it relates more particularly to an improvement making it possible to reduce the time necessary to change the coating product, that is to say most often to effect a change in color of the coating product, applied electrostatically.

L'invention concerne également une installation pour la mise en oeuvre du procédé.The invention also relates to an installation for implementing the method.

On sait que le principal problème dans l'application d'une peinture thermofusible se présentant sous la forme de poudre, réside dans le temps relativement long des opérations de changement de couleur. Classiquement, l'application de poudre se fait par voie électrostatique à l'intérieur d'une cabine dans laquelle on entretient une légère dépression par aspiration. Les moyens d'aspiration sont avantageusement associés à des moyens de récupération de poudre comportant par exemple un séparateur centrifuge, plus connu sous le nom de "cyclône" dont la sortie d'air épuré est reliée à un filtre finisseur retenant les particules de poudre non retenues par le séparateur, avant son remet dans l'atmosphère. Jusqu'à présent, chaque changement de couleur impliquait de nettoyer la cabine et les moyens d'aspiration. Les difficultés et les pertes de temps les plus importantes sont surtout occasionnées par le nettoyage de la cabine. En effet, la poudre récupérée dans le séparateur est généralement recyclée. Il est donc nécessaire de nettoyer très soigneusement toutes les surfaces sur lesquelles la poudre est susceptible de se déposer, chaque fois qu'on change la nature et/ou la couleur de la poudre, de façon à ne Jamais projeter sur les pièces un mélange de plusieurs poudres différentes. Or, les projecteurs, leurs réservoirs et les conduits d'alimentation peuvent être facilement nettoyés ou changés. Le nettoyage des moyens de filtration et notamment du séparateur ne pose généralement pas de problème et peut s'effectuer rapidement. En revanche, pour la cabine de projection, on n'a pas trouvé jusqu'à présent de solution pleinement satisfaisante pour débarrasser les parois de la cabine de toute trace de poudre. Une solution connue est décrite dans la demande PCT No 87-00771. Selon ce document, la cabine est essentiellement matérialisée par quatre faces de feuilles de matière plastique, définissant une sorte de tunnel, supportées par des rouleaux et une ossature interne. A chaque changement de couleur, on fait défiler les feuilles de matière plastique entre les rouleaux et l'ossature de façon à présenter une surface interne propre. Cependant, l'ossature interne doit être nettoyée manuellement avant déroulement des feuilles de matière plastique et pendant le déplacement de ces dernières, l'ossature peut être à nouveau salie par de la poudre déposée sur les parois, ce qui peut ensuite constituer une source de pollution des parois propres. La solution n'est donc pas totalement satisfaisante et elle suppose la mise en oeuvre de moyens mécaniques complexes. De plus, l'exploitation est coûteuse, en raison d'une certaine consommation de film de matière plastique et sa mise en oeuvre est délicate.It is known that the main problem in the application of a hot-melt paint in the form of powder, lies in the relatively long time of the color change operations. Conventionally, the application of powder is done electrostatically inside a cabin in which a slight vacuum is maintained by suction. The suction means are advantageously associated with powder recovery means comprising for example a centrifugal separator, better known under the name of "cyclone", the outlet of purified air of which is connected to a finishing filter retaining the particles of powder not retained by the separator, before returning it to the atmosphere. Until now, each change of color involved cleaning the cabin and the means of suction. The greatest difficulties and loss of time are mainly caused by cleaning the cabin. In fact, the powder recovered in the separator is generally recycled. It is therefore necessary to clean very carefully all the surfaces on which the powder is likely to deposit, each time the nature and / or the color of the powder is changed, so as never to spray on the parts a mixture of several different powders. However, the projectors, their tanks and the supply ducts can be easily cleaned or changed. The cleaning of the filtration means and in particular of the separator generally poses no problem and can be carried out quickly. On the other hand, for the projection booth, no fully satisfactory solution has so far been found to rid the walls of the booth of any trace of powder. A known solution is described in PCT Application No. 87-00771. According to this document, the cabin is essentially materialized by four faces of plastic sheets, defining a kind of tunnel, supported by rollers and an internal framework. Each time the color changes, the plastic sheets are passed between the rollers and the frame so as to have a clean internal surface. However, the internal framework must be cleaned manually before unwinding of the plastic sheets and during the movement of the latter, the framework can be again soiled with powder deposited on the walls, which can then constitute a source of pollution of clean walls. The solution is therefore not entirely satisfactory and it presupposes the use of complex mechanical means. In addition, the operation is expensive, due to a certain consumption of plastic film and its implementation is delicate.

L'invention propose une solution plus économique et permettant une mise en oeuvre très rapide.The invention provides a more economical solution and allows very rapid implementation.

L'invention découle de l'analyse selon laquelle il est pratiquement impossible d'empêcher par des moyens simples le dépôt d'une partie de la poudre projetée sur les parois internes de l'enceinte et que, d'autre part, tout nettoyage des parois nécessite une intervention longue (qui rend donc l'installation inutilisable pendant un temps important) et dont le résultat est incertain. L'idée de base de l'invention consiste donc à enlever purement et simplement l'enceinte à chaque changement de produit de revêtement et à la remplacer par une autre, correspondant au nouveau produit de revêtement. On dispose donc ainsi d'une pluralité d'enceintes interchangeables dont le nombre correspond au nombre des produits de revêtement différents susceptibles d'être appliqués. On peut aussi disposer de plusieurs jeux de telles enceintes adaptées à des objets différents.The invention follows from the analysis according to which it is practically impossible to prevent by simple means the deposition of a part of the powder sprayed on the internal walls of the enclosure and that, on the other hand, any cleaning of the walls requires a long intervention (which therefore makes the installation unusable for a significant time) and the result of which is uncertain. The basic idea of the invention therefore consists in purely and simply removing the enclosure at each change of coating product and replacing it with another, corresponding to the new coating product. We therefore have a plurality of interchangeable speakers whose number corresponds to number of different coating products that may be applied. We can also have several sets of such speakers adapted to different objects.

Dans cet esprit, l'invention concerne donc un procédé d'application d'un produit de revêtement, notamment une poudre, sur des objets à recouvrir, consistant à faire passer de tels objets dans une enceinte et à projeter un tel produit de revêtement de caractéristiques données sur les objets pendant leur passage dans ladite enceinte, caractérisé en ce que, une enceinte correspondant à un produit de revêtement donné étant fixée de façon détachable à une armature extérieure, un changement de produit de revêtement comporte les opérations consistant à déposer l'enceinte en place et à la remplacer par une autre enceinte correspondant à un nouveau produit de revêtement choisi.In this spirit, the invention therefore relates to a method of applying a coating product, in particular a powder, to objects to be covered, consisting in passing such objects through an enclosure and in projecting such a coating product. characteristics given to the objects during their passage through said enclosure, characterized in that, an enclosure corresponding to a given coating product being detachably fixed to an external frame, a change of coating product comprises the operations consisting in depositing the enclosure in place and replace it with another enclosure corresponding to a new coating product chosen.

De préférence, les enceintes sont en matériau souple de façon à pouvoir être repliées et rangées dans un espace minimum. L'enceinte est déployée et prend sa forme lorsqu'elle est rattachée à ladite armature, par des moyens d'attachement extérieurs tels que des liens souples, éventuellement élastiques.Preferably, the enclosures are made of flexible material so that they can be folded up and stored in a minimum space. The enclosure is deployed and takes its shape when it is attached to said frame, by external attachment means such as flexible links, possibly elastic.

L'invention concerne également une installation d'application d'un produit de revêtement caractérisée en ce qu'elle comprend une armature fixe extérieure et une pluralité d'enceintes, chaque enceinte étant conformée et dimensionnée pour pouvoir être placée dans ladite armature et rattachée à celle-ci pour être soutenue par elle.The invention also relates to an installation for applying a coating product, characterized in that it comprises an external fixed frame and a plurality of enclosures, each enclosure being shaped and dimensioned so as to be able to be placed in said frame and attached to it to be supported by it.

L'invention sera mieux comprise et d'autres avantages de celle-ci apparaîtront plus clairement à la lumière de la description qui va suivre de plusieurs modes de réalisation conformes à son principe, donnée uniquement à titre d'exemple et faite en référence aux dessins annexés dans lesquels:

  • - la figure 1 est une vue schématique en perspective d'une installation d'application d'un produit de revêtement conforme au principe de l'invention; et
  • - la figure 2 est une vue schématique en perspective d'un autre mode de réalisation d'une enceinte utilisable dans une telle installation.
The invention will be better understood and other advantages thereof will appear more clearly in the light of the following description of several embodiments in accordance with its principle, given solely by way of example and made with reference to the drawings annexed in which:
  • - Figure 1 is a schematic perspective view of an installation for applying a coating product according to the principle of the invention; and
  • - Figure 2 is a schematic perspective view of another embodiment of an enclosure usable in such an installation.

En se référant plus particulièrement à la figure 1, l'installation représentée comporte une armature rigide 1, porteuse et une enceinte 2 en matériau souple, ici en matière plastique telle que du polyéthylène, déployée à l'intérieur de ladite ossature et supportée par elle. En fait, l'installation comporte une pluralité d'enceintes 2, les autres enceintes correspondant chacune à un produit de revêtement particulier, étant repliées et rangées en attendant d'être utilisées à la place de l'enceinte rattachée à ladite armature fixe 1. Celle-ci a approximativement la forme d'un parallélépipède rectangle matérialisé par un assemblage de montants verticaux 1a et de traverses horizontales 1b. Ces éléments sont avantageusement en matériau isolant ou recouverts d'une épaisse couche de matériau isolant. Lorsqu'elle est déployée, chaque enceinte a une forme analogue à celle de l'armature, mais de dimensions plus faibles et l'enceinte en utilisation est raccordée à l'armature par des liens souples 3, en l'occurrence ici des tendeurs élastiques. Ces tendeurs sont munis de crochets 3a qui coopèrent avec des anneaux de raccordement 3b définis ou rattachés à des points choisis de l'enceinte, notamment à ses extrémités. L'enceinte 2 est constituée par des panneaux de matière plastique souple assemblés entre eux bord à bord, par exemple par soudure. Ainsi, selon l'exemple de la figure 1, l'enceinte est constituée de quatre faces sensiblement verticales 2a, 2b, 2c, 2d, de deux faces supérieures légèrement inclinées 2e, 2f et de quatre faces inférieures inclinées 2g, 2h, 2i, 2j formant une trémie 10 terminée par une ouverture circulaire. Par ailleurs, l'enceinte est pourvue d'une large ouverture 4 s'étendant d'une part, sur toute sa partie supérieure entre les faces 2e et 2f et se prolongeant par des échancrures verticales sur les faces verticales opposées 2b et 2c. Cette ouverture 4 permet le passage en translation des objets 8 à recouvrir suspendus à un convoyeur aérien 9. Ce dernier est disposé pour transporter les objets d'une extrémité à l'autre de l'enceinte au travers de l'ouverture 4. Ce convoyeur est par ailleurs relié à la terre. Au moins une autre ouverture 5 est pratiquée, ici dans la face 2d de l'enceinte, pour le passage d'un appareil de projection électrostatique 6 porté par un mécanisme de va-et-vient 7, situé à l'extérieur et qui le déplace verticalement pour que le jet de poudre balaye toute la hauteur des objets 8 à recouvrir. L'ouverture 5 peut simplement consister en une simple fente découpée à la demande. Les parties découpées peuvent avantageusement former des lèvres d'obturation partielle de l'ouverture 5. L'appareil de projection 6 est alimenté en poudre fluidisée par un conduit 11 qui est relié à un réservoir de poudre 12 dans lequel la poudre est maintenue à l'état fluidisé. Ce réservoir est classique et ne fait pas partie de l'invention. Il est monté sur des roulettes 15 pour pouvoir être facilement déplacé et changé lorsque l'utilisateur décide de changer de produit de revêtement. Un générateur électrique 16 accolé au mécanisme 7 alimente l'appareil de projection 6 en énergie électrique au moyen d'un câble électrique 17. L'ouverture inférieure de la trémie 10 est raccordée par un collier à serrage rapide 21 à l'extrémité d'un conduit 19 relié à des moyens d'aspiration non représentés mais classiques. Ces moyens d'aspiration comportent notamment un séparateur centrifuge ou "cyclône". L'extrémité du conduit 19 est fixée à la partie inférieure de l'armature par des haubans 20 ou analogues s'étendant entre les montants de ladite armature et l'extrémité du conduit. Ces haubans 20 constituent avantageusement un support horizontal utilisable pour les opérations de pliage de l'enceinte après son utilisation.Referring more particularly to FIG. 1, the installation shown comprises a rigid, load-bearing frame 1 and an enclosure 2 made of flexible material, here made of plastic material such as polyethylene, deployed inside said frame and supported by it . In fact, the installation comprises a plurality of enclosures 2, the other enclosures each corresponding to a particular coating product, being folded and stored while waiting to be used in place of the enclosure attached to said fixed frame 1. This has approximately the shape of a rectangular parallelepiped materialized by an assembly of vertical uprights 1 a and horizontal crosspieces 1 b . These elements are advantageously made of insulating material or covered with a thick layer of insulating material. When deployed, each enclosure has a shape similar to that of the frame, but of smaller dimensions and the enclosure in use is connected to the frame by flexible links 3, in this case here elastic tensioners . These tensioners are provided with hooks 3 a which cooperate with connection rings 3 b defined or attached to selected points of the enclosure, in particular at its ends. The enclosure 2 is constituted by panels of flexible plastic material assembled together edge to edge, for example by welding. Thus, according to the example of FIG. 1, the enclosure is made up of four substantially vertical faces 2 a , 2 b , 2 c , 2 d , of two slightly inclined upper faces 2 e , 2 f and of four inclined lower faces 2 g , 2 h , 2 i , 2 d forming a hopper 10 terminated by a circular opening. Furthermore, the enclosure is provided with a wide opening 4 extending on the one hand, over its entire upper part between the faces 2 e and 2 f and extending by vertical notches on the opposite vertical faces 2 b and 2 c . This opening 4 allows the passage in translation of the objects 8 to be covered suspended from an overhead conveyor 9. The latter is arranged for transport the objects from one end to the other of the enclosure through the opening 4. This conveyor is moreover connected to the ground. At least one other opening 5 is made, here in the face 2 d of the enclosure, for the passage of an electrostatic projection device 6 carried by a back-and-forth mechanism 7, located outside and which moves it vertically so that the powder jet sweeps the entire height of the objects 8 to be covered. The opening 5 can simply consist of a simple slot cut on demand. The cut parts can advantageously form lips for partially closing the opening 5. The projection apparatus 6 is supplied with fluidized powder by a conduit 11 which is connected to a powder reservoir 12 in which the powder is kept at the fluidized state. This tank is conventional and is not part of the invention. It is mounted on casters 15 so that it can be easily moved and changed when the user decides to change the coating product. An electric generator 16 attached to the mechanism 7 supplies the projection apparatus 6 with electric energy by means of an electric cable 17. The lower opening of the hopper 10 is connected by a quick-clamping collar 21 at the end of a conduit 19 connected to suction means not shown but conventional. These suction means include in particular a centrifugal separator or "cyclone". The end of the duct 19 is fixed to the lower part of the frame by guy wires 20 or the like extending between the uprights of said frame and the end of the duct. These guys 20 advantageously constitute a horizontal support which can be used for the folding operations of the enclosure after its use.

De façon classique, l'air est constamment aspiré dans l'enceinte en entraînant une partie de la poudre qui n'est pas déposée sur les objets. La plus grande partie de cette poudre est récupérée dans le séparateur centrifuge et recyclée vers le réservoir 12. L'air sortant du séparateur est rejeté à l'atmosphère après avoir traversé un filtre qui retient les dernières particules de poudre qui n'ont pu être récupérées dans le séparateur. Le filtre est nettoyé de temps en temps, la poudre captée par lui n'étant pas recyclée. On sait que le séparateur peut être nettoyé très rapidement et facilement par une simple aspiration d'air propre, au moment du changement de produit de revêtement, éventuellement aussi par passage d'un chiffon introduit dans les moyens d'aspiration. Cependant, lorsque la poudre chargée électrostatiquement est projetée sur les objets 8 mis à la terre, une partie se dépose sur les parois internes de l'enceinte.Conventionally, air is constantly drawn into the enclosure, entraining part of the powder which is not deposited on the objects. Most of this powder is collected in the centrifugal separator and recycled to the reservoir 12. The air leaving the separator is discharged into the atmosphere after passing through a filter which retains the last particles of powder which could not be recovered in the separator. The filter is cleaned from time to time, the powder collected by it not being recycled. It is known that the separator can be cleaned very quickly and easily by a simple suction of clean air, when changing the coating product, possibly also by passing a cloth introduced into the suction means. However, when the electrostatically charged powder is sprayed onto the grounded objects 8, a part is deposited on the internal walls of the enclosure.

Selon l'invention, on évite de nettoyer l'enceinte à chaque changement de produit de revêtement et on remplace l'enceinte en utilisation par une autre correspondant au nouveau produit de revêtement. Ainsi, si les produits de revêtement ne diffèrent que par leur couleur, l'installation comprendra autant d'enceintes pliables que de couleurs. Les opérations à mettre en oeuvre pour le changement de produit de revêtement sont les suivantes:According to the invention, the enclosure is avoided to be cleaned at each change of coating product and the enclosure in use is replaced by another corresponding to the new coating product. Thus, if the coating products differ only in their color, the installation will include as many foldable speakers as there are colors. The operations to be carried out for the change of coating product are as follows:

On arrête la projection de poudre et on immobilise le mécanisme 7 en position basse. Le conduit 11 est déconnecté du réservoir 12 et de l'air propre y est injecté pour nettoyer à la fois le conduit 11 et l'appareil de projection 6. L'enceinte 2 est secouée manuellement pour faire tomber la plus grande partie de la poudre recouvrant les parois dans la trémie afin que cette poudre soit entraînée vers le séparateur. On décroche alors les tendeurs élastiques 3 en commençant par le haut, ce qui permet de plier l'enceinte sur les haubans 20. On ouvre ensuite le collier 21, ce qui libère totalement l'enceinte. On procède ensuite au nettoyage du séparateur; ces opérations sont classiques.Powder spraying is stopped and the mechanism 7 is immobilized in the low position. The conduit 11 is disconnected from the reservoir 12 and clean air is injected therein to clean both the conduit 11 and the projection apparatus 6. The enclosure 2 is shaken manually to drop most of the powder covering the walls in the hopper so that this powder is entrained towards the separator. The elastic tensioners 3 are then lifted, starting from the top, which allows the enclosure to be folded over the shrouds 20. The collar 21 is then opened, which completely frees the enclosure. The separator is then cleaned; these operations are conventional.

L'installation est alors prête à recevoir une autre enceinte 2 correspondant au nouveau produit de revêtement contenu dans un autre réservoir de poudre 12. Le montage de la nouvelle enceinte se fait par une succession d'opérations inverses de celles qui ont été décrites ci-dessus.The installation is then ready to receive another enclosure 2 corresponding to the new coating product contained in another powder reservoir 12. The mounting of the new enclosure is carried out by a succession of reverse operations to those which have been described below. above.

L'expérience a montré qu'un opérateur pouvait réaliser l'ensemble des opérations indiquées ci-dessus en environ le dixième du temps nécessaire au nettoyage d'une enceinte unique fixe, tout en éliminant de façon beaucoup plus sure tout risque de pollution d'un produit de revêtement récupéré par un autre. Les enceintes en matière plastique souple sont peu coûteuses.Experience has shown that an operator can carry out all of the operations indicated above in approximately one tenth of the time necessary to clean a single fixed enclosure, while eliminating in a much safer way any risk of pollution of one coating product recovered by another. The flexible plastic enclosures are inexpensive.

Le matériau réalisant l'enceinte sera de préférence un matériau isolant, afin de limiter la quantité de poudre déposée sur les parois. Ainsi, en cas d'inflammation de la poudre à la suite, par exemple, d'une étincelle, la quantité de poudre susceptible de s'enflammer sera relativement faible et dégagera peu de chaleur. Il est à noter d'ailleurs que, l'emploi de feuilles minces et souples augmente aussi la sécurité en cas d'inflammation de la poudre car la pression ne peut s'élever dans l'enceinte en raison de la déformation des parois. On élimine ainsi tout risque d'explosion de ladite enceinte.The material making the enclosure will preferably be an insulating material, in order to limit the amount of powder deposited on the walls. Thus, in the event of ignition of the powder following, for example, a spark, the quantity of powder liable to ignite will be relatively small and will give off little heat. It should also be noted that the use of thin and flexible sheets also increases safety in the event of ignition of the powder because the pressure cannot rise in the enclosure due to the deformation of the walls. This eliminates any risk of explosion of said enclosure.

Cependant, pour éviter des décharges rampantes dues au dépôt de particules chargées sur les parois, on peut envisager que les faces internes de l'enceinte soient au moins en partie conductrices, par exemple faiblement métallisées, et reliées à la terre.However, to avoid creeping discharges due to the deposition of charged particles on the walls, it can be envisaged that the internal faces of the enclosure are at least partially conductive, for example weakly metallized, and connected to the ground.

Par ailleurs, le matériau utilisé pour réaliser l'enceinte peut avantageusement être translucide ou transparent. Ceci peut être mis à profit pour placer une cellule photo-électrique de détection de flammes 25 ou un moyen analogue à l'extérieur de l'enceinte, de préférence en regard d'une paroi de cette enceinte peu exposée au produit de revêtement. Ainsi, la cellule peut être placée en regard de la paroi 2e ou 2f. Il est à noter que cette cellule, qui était classiquement disposée à l'intérieur de l'enceinte était souvent recouverte de poudre et remplissait mal sa fonction.Furthermore, the material used to make the enclosure can advantageously be translucent or transparent. This can be used to place a photoelectric flame detection cell 25 or similar means outside the enclosure, preferably facing a wall of this enclosure little exposed to the coating product. Thus, the cell can be placed opposite the wall 2 e or 2 f . It should be noted that this cell, which was conventionally placed inside the enclosure, was often covered with powder and poorly fulfilled its function.

On peut aussi envisager de mettre en oeuvre des enceintes de formes différentes correspondant à des objets à recouvrir différents, pourvu que les enceintes puissent être montées à l'intérieur de la même armature présentant les points d'ancrage et les moyens d'attachement nécessaires.It is also possible to envisage using enclosures of different shapes corresponding to different objects to be covered, provided that the enclosures can be mounted inside the same frame with the anchoring points and the necessary attachment means.

La figure 2 illustre une variante d'enceinte munie de prolongements s'étendant latéralement et/ou à sa partie supérieure pour former des sortes de "sas". On peut ainsi limiter les turbulences dans la zone de projection et les fuites de particules de poudre dans le local. Sur la figure 2, l'armature externe n'a pas été représentée mais il est clair que la forme de cette armature est adaptée à la nouvelle forme de l'enceinte. Celle-ci se décompose en une chambre de projection 30 et en deux chambres latérales formant des "sas" d'entrée et de sortie, 31, 32, qui prolongent ainsi les extrémités latérales de l'ouverture 4 représentée dans le mode de réalisation de la figure 1. La partie supérieure de cette ouverture, pour le passage des supports d'objets, est également prolongée vers le haut par un "sas" longitudinal 33. Les parties inférieures des "sas 31 et 32 se réunissent à la trémie. Dans l'exemple représenté, la chambre de projection 30 comporte une ouverture 35 permettant l'accès de l'opérateur manipulant, ici, un projecteur manuel.FIG. 2 illustrates a variant of the enclosure provided with extensions extending laterally and / or at its upper part to form sorts of "airlocks". It is thus possible to limit the turbulence in the projection area and the leakage of powder particles in the room. In Figure 2, the external frame has not been shown but it is clear that the shape of this frame is adapted to the new shape of the enclosure. This breaks down into a projection chamber 30 and into two lateral chambers forming entry and exit "locks", 31, 32, which thus extend the lateral ends of the opening 4 shown in the embodiment of Figure 1. The upper part of this opening, for the passage of object supports, is also extended upwards by a longitudinal "airlock" 33. The lower parts of "airlocks 31 and 32 meet at the hopper. the example shown, the projection chamber 30 has an opening 35 allowing access for the operator handling, here, a manual projector.

Claims (15)

1- Procédé d'application d'un produit de revêtement, notamment une poudre, sur des objets à recouvrir, consistant à faire passer de tels objets (8) dans une enceinte (2) et à projeter un tel produit de revêtement de caractéristiques données sur les objets pendant leur passage dans ladite enceinte, caractérisé en ce que, une enceinte (2) correspondant à un produit de revêtement donné étant fixée de façon détachable à une armature extérieure (1), un changement de produit de revêtement comporte les opérations consistant à déposer l'enceinte en place et à la remplacer par une autre enceinte correspondant à un nouveau produit de revêtement choisi.1- Method for applying a coating product, in particular a powder, to objects to be covered, consisting in passing such objects (8) through an enclosure (2) and in projecting such a coating product with given characteristics on objects during their passage through said enclosure, characterized in that, an enclosure (2) corresponding to a given coating product being detachably attached to an external frame (1), a change of coating product comprises the operations consisting place the enclosure in place and replace it with another enclosure corresponding to a new coating product chosen. 2- Procédé selon la revendication 1, caractérisé en ce qu'il consiste à mettre en oeuvre des enceintes (2) en matériau souple, en nombre correspondant à celui des produits de revêtement et susceptibles d'être, chacune, rattachée à ladite armature (1) par des moyens d'attachement (3) extérieurs, et en ce qu'il consiste, à chaque changement de produit de revêtement, à décrocher et replier l'enceinte utilisée pour la remplacer par une nouvelle enceinte correspondant au nouveau produit de revêtement.2- A method according to claim 1, characterized in that it consists in using enclosures (2) made of flexible material, in a number corresponding to that of the coating products and capable of being, each, attached to said frame ( 1) by external attachment means (3), and in that it consists, at each change of coating product, to unhook and fold the enclosure used to replace it with a new enclosure corresponding to the new coating product . 3- Procédé selon la revendication 1 ou 2, caractérisé en ce que la mise en place d'une telle enceinte comporte l'opération consistant à raccorder une ouverture inférieure de ladite enceinte à des moyens d'aspiration.3- A method according to claim 1 or 2, characterized in that the establishment of such an enclosure comprises the operation of connecting a lower opening of said enclosure to suction means. 4- Installation d'application d'un produit de revêtement caractérisée en ce qu'elle comprend une armature fixe (1) et une pluralité d'enceintes (2), chaque enceinte étant conformée et dimensionnée pour pouvoir être placée dans ladite armature et rattachée à celle-ci pour être soutenue par elle.4- Installation for applying a coating product, characterized in that it comprises a fixed frame (1) and a plurality of enclosures (2), each enclosure being shaped and dimensioned so as to be able to be placed in said frame and attached to it to be supported by it. 5- Installation selon la revendication 4, caractérisée en ce que ladite armature (1) a approximativement la forme d'un parallélépipède rectangle matérialisé par un assemblage de montants et traverses rigides, en ce que chaque enceinte (2) a une forme analogue de dimensions plus réduites, et en ce que l'enceinte en utilisation est raccordée à ladite armature par des liens souples (3), de préférence élastiques.5- Installation according to claim 4, characterized in that said frame (1) has approximately the shape of a rectangular parallelepiped materialized by an assembly of uprights and crosspieces rigid, in that each enclosure (2) has a similar shape of smaller dimensions, and in that the enclosure in use is connected to said frame by flexible links (3), preferably elastic. 6- Installation selon la revendication 4 ou 5, caractérisée en ce que chaque enceinte (2) est en matériau souple et de ce fait, repliable.6- Installation according to claim 4 or 5, characterized in that each enclosure (2) is made of flexible material and therefore foldable. 7- Installation selon la revendication 6, caractérisée en ce que chaque enceinte est constituée par des panneaux de matériau souple, par exemple des feuilles de matière plastique, assemblés entre eux bord à bord et en ce que ladite enceinte (2) est déployée en utilisation par son raccordement à ladite armature (1) des moyens d'attachement (3b) étant prévus extérieurement en des emplacements choisis de ladite enceinte.7- Installation according to claim 6, characterized in that each enclosure is constituted by panels of flexible material, for example sheets of plastic material, assembled together edge to edge and in that said enclosure (2) is deployed in use by its connection to said frame (1) attachment means ( 3b ) being provided externally at selected locations of said enclosure. 8- Installation selon la revendication 7, caractérisée en ce que chaque enceinte est pourvue d'une large ouverture (4) s'étendant sur toute sa partie supérieure et sur deux faces verticales opposées, pour le passage en translation desdits objets (8).8- Installation according to claim 7, characterized in that each enclosure is provided with a large opening (4) extending over its entire upper part and on two opposite vertical faces, for the passage in translation of said objects (8). 9- Installation selon la revendication 8, caractérisée en ce que chaque enceinte comporte au moins une autre ouverture (5), éventuellement de simples fentes pratiquées à la demande, pour le passage d'un appareil de projection (6) dudit produit de revêtement.9- Installation according to claim 8, characterized in that each enclosure has at least one other opening (5), possibly simple slots made on demand, for the passage of a projection device (6) of said coating product. 10- Installation selon l'une des revendications 4 à 9, caractérisée en ce que la partie inférieure de ladite enceinte est conformée en trémie (10), en ce que cette dernière est munie d'un orifice susceptible d'être raccordé à un conduit (19) placé à la partie inférieure de ladite armature et en ce que ce conduit est raccordé à des moyens d'aspiration, de préférence munis d'un séparateur centrifuge, connu en soi.10- Installation according to one of claims 4 to 9, characterized in that the lower part of said enclosure is shaped as a hopper (10), in that the latter is provided with an orifice capable of being connected to a conduit (19) placed at the bottom of said frame and in that this duct is connected to suction means, preferably provided with a centrifugal separator, known per se. 11- Installation selon la revendication 10, caractérisée en ce que l'extrémité dudit conduit est fixée à la partie inférieure de l'armature par des haubans (20) ou analogues et en ce que ceux-ci forment avantageusement un support pour les opérations de pliage d'une enceinte après utilisation.11- Installation according to claim 10, characterized in that the end of said duct is fixed to the lower part of the frame by stays (20) or the like and in that these advantageously form a support for folding the enclosure after use. 12- Installation selon l'une des revendications 5 à 11, caractérisée en ce que le matériau souple de l'enceinte est électriquement isolant.12- Installation according to one of claims 5 to 11, characterized in that the flexible material of the enclosure is electrically insulating. 13- Installation selon l'une des revendications 6 à 11, caractérisée en ce que les faces internes de l'enceinte sont, au moins en partie, conductrices, par exemple métallisées et mises à la terre.13- Installation according to one of claims 6 to 11, characterized in that the internal faces of the enclosure are, at least in part, conductive, for example metallized and earthed. 14- Installation selon la revendication 8, caractérisée en ce que ladite ouverture est prolongée latéralement et/ou à sa partie superieure par des parties formant "sas" (31, 32, 33).14- Installation according to claim 8, characterized in that said opening is extended laterally and / or at its upper part by parts forming "airlock" (31, 32, 33). 15- Installation selon l'une des revendications 6 à 14, caractérisée en ce que le matériau souple est translucide ou transparent et en ce qu'une cellule photo­électrique (25) de détection de flamme ou moyen analogue, est placée à l'extérieur de ladite enceinte, de préférence en regard d'une paroi de celle-ci peu exposée au produit de revêtement.15- Installation according to one of claims 6 to 14, characterized in that the flexible material is translucent or transparent and in that a photoelectric cell (25) for flame detection or the like, is placed outside of said enclosure, preferably facing a wall thereof exposed little to the coating product.
EP89403465A 1988-12-21 1989-12-13 Method and installation for applying a coating product Expired - Lifetime EP0375511B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8816912A FR2640526B1 (en) 1988-12-21 1988-12-21 METHOD AND INSTALLATION FOR APPLYING A COATING PRODUCT
FR8816912 1988-12-21

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EP (1) EP0375511B1 (en)
CA (1) CA2002112A1 (en)
ES (1) ES2015843T3 (en)
FR (1) FR2640526B1 (en)
PT (1) PT92635B (en)

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WO1991014509A1 (en) * 1990-03-19 1991-10-03 Eric Von Gertten Ab A device for spray painting and similar treatment of objects
EP0520398A1 (en) * 1991-06-27 1992-12-30 Ransburg Corporation Powder coating booth
EP0611605A1 (en) * 1993-02-13 1994-08-24 Roger Walter Britton Coating system
ITUB20152198A1 (en) * 2015-07-15 2017-01-15 Siver S R L PAINTING CABIN

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DE29521972U1 (en) * 1994-10-24 1998-12-24 Kraemer Erich Powder coating booth
WO1996020792A1 (en) * 1995-01-07 1996-07-11 Peter Weigert Spray-painting cubicle
DE19837878A1 (en) * 1998-08-20 2000-02-24 Matthias Kraemer Treatment facility
US20110033607A1 (en) * 2003-07-17 2011-02-10 Enamelite, Llc Aerosolized fingerprint powder compositions
DE102006058350A1 (en) * 2006-12-11 2008-06-12 Dürr Systems GmbH Coating plant and process for serial coating of workpieces
CN105618314B (en) * 2016-03-16 2017-11-10 沙洲职业工学院 A kind of adjustable T-shaped guide rail automatic oil sprayer

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WO1991014509A1 (en) * 1990-03-19 1991-10-03 Eric Von Gertten Ab A device for spray painting and similar treatment of objects
EP0520398A1 (en) * 1991-06-27 1992-12-30 Ransburg Corporation Powder coating booth
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EP0611605A1 (en) * 1993-02-13 1994-08-24 Roger Walter Britton Coating system
ITUB20152198A1 (en) * 2015-07-15 2017-01-15 Siver S R L PAINTING CABIN

Also Published As

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PT92635A (en) 1990-06-29
EP0375511B1 (en) 1993-07-21
FR2640526B1 (en) 1991-04-05
ES2015843A4 (en) 1990-09-16
PT92635B (en) 1995-09-12
ES2015843T3 (en) 1993-12-16
US5149373A (en) 1992-09-22
CA2002112A1 (en) 1990-06-21
FR2640526A1 (en) 1990-06-22

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