EP0291423B1 - Booth for coating objects with powder - Google Patents

Booth for coating objects with powder Download PDF

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Publication number
EP0291423B1
EP0291423B1 EP88420144A EP88420144A EP0291423B1 EP 0291423 B1 EP0291423 B1 EP 0291423B1 EP 88420144 A EP88420144 A EP 88420144A EP 88420144 A EP88420144 A EP 88420144A EP 0291423 B1 EP0291423 B1 EP 0291423B1
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EP
European Patent Office
Prior art keywords
booth
booth according
powder coating
sheet
walls
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP88420144A
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German (de)
French (fr)
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EP0291423A1 (en
Inventor
Jean-Jacques Celant
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Individual
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Individual
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Priority to AT88420144T priority Critical patent/ATE74028T1/en
Publication of EP0291423A1 publication Critical patent/EP0291423A1/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05BSPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B16/00Spray booths
    • B05B16/20Arrangements for spraying in combination with other operations, e.g. drying; Arrangements enabling a combination of spraying operations
    • B05B16/25Arrangements for spraying in combination with other operations, e.g. drying; Arrangements enabling a combination of spraying operations for both automatic and manual spraying
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05BSPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/16Arrangements for controlling delivery; Arrangements for controlling the spray area for controlling the spray area
    • B05B12/32Shielding elements, i.e. elements preventing overspray from reaching areas other than the object to be sprayed
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05BSPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B16/00Spray booths
    • B05B16/40Construction elements specially adapted therefor, e.g. floors, walls or ceilings
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05BSPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B16/00Spray booths
    • B05B16/90Spray booths comprising conveying means for moving objects or other work to be sprayed in and out of the booth, e.g. through the booth
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B08CLEANING
    • B08BCLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B15/00Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area
    • B08B15/02Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area using chambers or hoods covering the area
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B08CLEANING
    • B08BCLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B17/00Methods preventing fouling
    • B08B17/02Preventing deposition of fouling or of dust
    • B08B17/04Preventing deposition of fouling or of dust by using removable coverings

Definitions

  • the present invention relates to a powder coating booth, in particular electrostatic powder coating, for coating objects, in particular metallic objects.
  • Document DE-A-2 704 497 describes a cabin for treating the surface of an object, the side and upper walls of which can be coated, on their inner face, with an impermeable sheet of consumable material.
  • this document does not provide means ensuring a simple plating of the sheets against the walls, and rapid interchangeability of these sheets.
  • the invention aims to remedy these drawbacks by providing a powder-coating booth of this type, in which the external walls are lined internally, over all or part of their surface, by another rigid wall "permeable to air, l interval between these walls delimiting a space in which a vacuum is applied capable of ensuring the plating on this permeable wall of each flexible, consumable and waterproof sheet, capable of covering it over all or part of its surface which is outside the zone d bottom suction.
  • this electrostatic powder coating booth 1 is a booth for automatic installation of coating of objects (not shown) which are continuously scrolled, suspended from metal hooks 40 which circulate on a conveyor 3 connected to ground of the installation.
  • the floor of the cabin is composed of an endless filtering rotating belt 14 through which a suction is applied which puts the cabin in depression with respect to the ambient atmosphere outside it.
  • This suction is achieved by a vacuum applied inside the hollow base 15 of the cabin, this base also containing the rollers 16 for supporting and advancing the endless belt 14.
  • the side faces 7, 8 of the cabin and its roof 18 are lined internally by a metal wall 19 pierced with numerous holes 20.
  • This double wall 19 is placed at a distance of 3 to 5 centimeters from the wall exterior 7,8,18.
  • the space 21 between the two walls is placed under vacuum relative to the interior of the cabin by means of a medium pressure turbine not shown.
  • the double perforated wall 19 is supported by spacers 22 (FIG. 4) and the lateral openings 9, 10, 13 and upper 6 of the cabin are bordered internally by a tube 23, of square section, the face 24 looking towards the interior of the cabin is constituted by a porous sintered material, such as porous bronze.
  • a vacuum greater than that prevailing in the space 21 is applied to the interior of the tubes 23 by another turbine, not shown.
  • the roof 18 of the cabin carries two rows of rollers 25, 26.
  • the large lateral faces 7 and 8 carry, at their lower part, two horizontal rows 27, 28 of rollers of the same diameters as the other rollers 25, 26.
  • the rollers 25, 26, the rollers 27, 28 are placed on the outer face of the walls 7 and 8. All of these rollers 25 to 28 can optionally be motorized, by conventional means not shown, so as to rotate by controlled manner in the directions indicated by the arrows in Figure 2.
  • each of the walls 7,8 and the base 1 is formed, over almost the entire length of these walls, a slender space defining for these walls 7,8 of the lower longitudinal slots 29 and 30.
  • rollers 28 and 25 respectively serve as downstream winders and upstream unwinders for a consumable sheet 31 of flexible plastic material, for example from 0.05 to 0.15 mm thick polyethylene.
  • rollers 27 and 26 serve respectively as downstream winders and upstream unwinders for another consumable sheet 32 identical to the sheet 31.
  • the installation being stopped it is first of all about coating the internal walls of the cabin, except carpet 14, with the plastic sheets 31 and 32.
  • the rollers 25 to 28 are rotated so as to allow a sufficient quantity of plastic sheet 31.32 to hang down, as drawn in dashed lines in FIG. 2.
  • rotation of the rollers, and a relatively high vacuum is applied in the space 21 using the medium pressure turbine, for example of the order of 200 to 300 millimeters of water column.
  • the operator then enters the cabin and manually applies the sheets 31 and 32 against the perforated walls 19, after having cut through the orifices for passage for the automatic pistols 11,12. Plating of the plastic sheets against the perforated walls 19 is ensured by the vacuum existing in the space 21.
  • an even stronger vacuum is applied in the tubes 23, which allows, taking into account the good regularity of suction provided by the porous walls 24, to guarantee a good seal around the openings.
  • FIGS. 5 and 6 very schematically represent, in cross section and in partial view from above, a variant of the previous cabin 1, here with a pyramidal bottom 50 and conventional suction duct 51 , and rounded angles greater than 90 degrees between the different parts of the double wall 19.
  • the format of the protective film is often greater than the dimensions of the walls to be protected, the excess will be easily cut by following the edges of these walls.
  • the four arms 65 are first of all manually removed to release the sheets 31 and 32 from their grip.
  • the sliding doors 63 and 64 are operated to allow them to obstruct the side openings 10, 13 for the passage of the powder spray guns (the latter have been previously retracted).
  • the motorized downstream rollers 27,28 are then started up to advance the plastic sheets 31,32 by a sufficient amount.
  • the four arms 65 are then unlocked, which are pressed against the ends of these sheets 31,32 under the action of the springs 67. This creates a practically closed suction space between the sheets 31,32 (which are for the dangling moment as drawn in dashed lines in FIG.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
  • Details Or Accessories Of Spraying Plant Or Apparatus (AREA)
  • Paints Or Removers (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

Booth for electrostatic powder-coating with quick colour change. <??>It comprises a double wall (19) defining a space (21) in which a vacuum is applied. This double wall (19) is perforated in such a way that it permits the application thereto of an expendable plastic film (31, 32). <IMAGE>

Description

La présente invention se rapporte à une cabine de poudrage, en particulier de poudrage électrostatique, pour le revêtement d'objets, en particulier d'objets métalliques.The present invention relates to a powder coating booth, in particular electrostatic powder coating, for coating objects, in particular metallic objects.

L'application des résines organiques en poudre, en remplacement des peintures liquides traditionnelles, est devenue industrielle depuis environ une trentaine d'années, et en particulier la technique du revêtement d'objets par poudrage électrostatique est maintenant très largement répandue. Quels que soient les projecteurs de poudre utilisés, soit manuels, soit automatiques, le poudrage est réalisé dans une cabine de poudrage permettant de confiner le brouillard de poudre et, par une dépression créée dans la cabine, d'en récupérer l'excédent. La poudre récupérée est filtrée, puis recyclée.The application of powdered organic resins, replacing traditional liquid paints, has become industrial for about thirty years, and in particular the technique of coating objects by electrostatic powdering is now very widespread. Whatever powder sprayers are used, either manual or automatic, the powdering is carried out in a powdering booth making it possible to confine the powder mist and, by a vacuum created in the booth, to recover the excess. The recovered powder is filtered and then recycled.

En cas de changement de couleur, il est nécessaire, avant de projeter la nouvelle poudre, d'une autre couleur, de nettoyer au préalable l'intérieur de la cabine pour enlever toute trace de poudre de la première couleur, sans quoi il y aurait pollution de la nouvelle poudre par l'ancienne. Cette opération de nettoyage est assez longue, ce qui, du fait qu'elle nécessite d'arrêter l'installation de poudrage, pénalise lourdement le rendement de cette installation.In the event of a change of color, it is necessary, before spraying the new powder, of another color, to clean the interior of the cabin beforehand to remove all traces of powder of the first color, otherwise there would be pollution of the new powder by the old. This cleaning operation is quite long, which, due to the fact that it requires stopping the powdering installation, severely penalizes the performance of this installation.

Le document DE-A-2 704 497 décrit une cabine pour traitement de surface d'objet dont les parois latérales et supérieures peuvent être revêtues, sur leur face intérieure, d'une feuille imperméable de matériau consommable. Toutefois, ce document ne fournit pas de moyens assurant un placage simple des feuilles contre les parois, et une interchangeabilité rapide de ces feuilles.Document DE-A-2 704 497 describes a cabin for treating the surface of an object, the side and upper walls of which can be coated, on their inner face, with an impermeable sheet of consumable material. However, this document does not provide means ensuring a simple plating of the sheets against the walls, and rapid interchangeability of these sheets.

L'invention vise à remédier à ces inconvénients, en fournissant une cabine de poudrage de ce type, dans laquelle les parois externes sont doublées intérieurement, sur tout ou partie de leur surface, par une autre paroi rigide "perméable à l'air, l'intervalle entre ces parois délimitant un espace dans lequel est appliquée une dépression apte à assurer le placage sur cette paroi perméable de chaque feuille souple, consommable et étanche, apte à la recouvrir sur tout ou partie de sa surface qui est extérieure à la zone d'aspiration par le fond.The invention aims to remedy these drawbacks by providing a powder-coating booth of this type, in which the external walls are lined internally, over all or part of their surface, by another rigid wall "permeable to air, l interval between these walls delimiting a space in which a vacuum is applied capable of ensuring the plating on this permeable wall of each flexible, consumable and waterproof sheet, capable of covering it over all or part of its surface which is outside the zone d bottom suction.

L'invention sera bien comprise, et ses avantages et autres caractéristiques ressortiront, au cours de la description suivante de quelques exemples non limitatifs de réalisation, en référence au dessin schématique annexé dans lequel :

  • Figure 1 est une vue en perspective partiellement écorchée de cette cabine de poudrage électrostatique ;
  • Figure 2 est une vue en coupe transversale selon II-II de figure 1 ;
  • Figure 3 est une vue en coupe selon III-III de figure 2 ;
  • Figure 4 est une coupe transversale agrandie d'une des ouvertures de passage d'un projecteur de poudre ;
  • Figure 5 est une vue, similaire à figure 2, d'une variante de réalisation de cette cabine ;
  • Figure 6 est une vue partielle de dessus de la cabine de figure 5 ;
  • Figure 7 est une vue en perspective d'une autre variante de réalisation ; et
  • Figure 8 est une vue de dessus, partielle et simplifiée, de la cabine de la figure 7.
The invention will be clearly understood, and its advantages and other characteristics will emerge during the following description of some nonlimiting exemplary embodiments, with reference to the appended schematic drawing in which:
  • Figure 1 is a partially cutaway perspective view of this electrostatic powder coating booth;
  • Figure 2 is a cross-sectional view along II-II of Figure 1;
  • Figure 3 is a sectional view along III-III of Figure 2;
  • Figure 4 is an enlarged cross section of one of the passage openings of a powder sprayer;
  • Figure 5 is a view, similar to Figure 2, of an alternative embodiment of this cabin;
  • Figure 6 is a partial top view of the cabin of Figure 5;
  • Figure 7 is a perspective view of another alternative embodiment; and
  • Figure 8 is a partial and simplified top view of the cabin in Figure 7.

En se reportant aux figures 1 à 4, cette cabine de poudrage électrostatique 1 est une cabine pour installation automatique de revêtement d'objets (non représentés) qui défilent continûment, suspendus à des crochets métalliques 40 qui circulent sur un convoyeur 3 relié à la masse de l'installation.Referring to Figures 1 to 4, this electrostatic powder coating booth 1 is a booth for automatic installation of coating of objects (not shown) which are continuously scrolled, suspended from metal hooks 40 which circulate on a conveyor 3 connected to ground of the installation.

La cabine 1 a une forme générale parallélépipédique, et est pourvue de plusieurs ouvertures :

  • une ouverture frontale 4 et une ouverture arrière 5, appelées "silhouettes" et aptes à livrer passage aux objets à revêtir ;
  • une ouverture, ou fente, longitudinale 6, pratiquée dans le toit 18 de la cabine 1 et apte à livrer passage au convoyeur 3 ;
  • sur chacune des deux grandes faces latérales 7,8 de la cabine, deux ouvertures 9,10 de passage des projecteurs automatiques de poudre 11,12, et une ouverture 13 de passage d'un projecteur manuel (non représenté).
The cabin 1 has a generally parallelepiped shape, and is provided with several openings:
  • a front opening 4 and a rear opening 5, called "silhouettes" and able to give passage to the objects to be coated;
  • a longitudinal opening, or slot 6, made in the roof 18 of the cabin 1 and capable of delivering passage to the conveyor 3;
  • on each of the two large lateral faces 7, 8 of the cabin, two openings 9, 10 for passage of the automatic powder projectors 11, 12, and an opening 13 for passage of a manual projector (not shown).

De manière traditionnelle, le sol de la cabine est composé d'un tapis rotatif filtrant sans fin 14 au travers duquel est appliquée une aspiration qui met la cabine en dépression par rapport à l'atmosphère ambiante extérieure à celle-ci. Cette aspiration est réalisée par une dépression appliquée à l'intérieur du socle creux 15 de la cabine, ce socle contenant en outre les rouleaux 16 de support et d'avancement du tapis sans fin 14.Traditionally, the floor of the cabin is composed of an endless filtering rotating belt 14 through which a suction is applied which puts the cabin in depression with respect to the ambient atmosphere outside it. This suction is achieved by a vacuum applied inside the hollow base 15 of the cabin, this base also containing the rollers 16 for supporting and advancing the endless belt 14.

La bande filtrante 14 circule en sens inverse de la direction F d'avancée des pièces sur le convoyeur 3. Une rampe d'aspiration 17 est placée à l'aval de ce tapis sans fin 14 et récupère la poudre qui s'est déposée sur ce tapis 14.The filter strip 14 circulates in the opposite direction to the direction F of advancement of the parts on the conveyor 3. A suction ramp 17 is placed downstream of this endless belt 14 and recovers the powder which has deposited on this carpet 14.

Conformément à l'invention, les faces latérales 7,8 de la cabine et son toit 18 sont doublés intérieurement par une paroi métallique 19 percée de nombreux trous 20. Cette double paroi 19 est placée à une distance de 3 à 5 centimètres de la paroi extérieure 7,8,18.According to the invention, the side faces 7, 8 of the cabin and its roof 18 are lined internally by a metal wall 19 pierced with numerous holes 20. This double wall 19 is placed at a distance of 3 to 5 centimeters from the wall exterior 7,8,18.

L'espace 21 entre les deux parois est mis en dépression par rapport à l'intérieur de la cabine au moyen d'une turbine moyenne pression non représentée. La double paroi perforée 19 est soutenue par des entretoises 22 (figure 4) et les ouvertures latérales 9,10,13 et supérieure 6 de la cabine sont bordées intérieurement par une tubulure 23, à section carrée, dont la face 24 regardant vers l'intérieur de la cabine est constituée par un matériau poreux fritté, tel que du bronze poreux. Une dépression supérieure à celle régnant dans l'espace 21 est appliquée à l'intérieur des tubes 23 par une autre turbine non représentée.The space 21 between the two walls is placed under vacuum relative to the interior of the cabin by means of a medium pressure turbine not shown. The double perforated wall 19 is supported by spacers 22 (FIG. 4) and the lateral openings 9, 10, 13 and upper 6 of the cabin are bordered internally by a tube 23, of square section, the face 24 looking towards the interior of the cabin is constituted by a porous sintered material, such as porous bronze. A vacuum greater than that prevailing in the space 21 is applied to the interior of the tubes 23 by another turbine, not shown.

De part et d'autre de la fente 6, le toit 18 de la cabine porte deux rangées de rouleaux 25,26. Pareillement, les grandes faces latérales 7 et 8 portent, à leur partie inférieure, deux rangées horizontales 27,28 de rouleaux de mêmes diamètres que les autres rouleaux 25,26. De même que pour les rouleaux 25,26, les rouleaux 27,28 sont placés sur la face extérieure des parois 7 et 8. Tous ces rouleaux 25 à 28 peuvent éventuellement être motorisés, par des moyens classiques non représentés, de façon à tourner de manière commandée dans les sens indiqués par les flèches sur la figure 2.On either side of the slot 6, the roof 18 of the cabin carries two rows of rollers 25, 26. Similarly, the large lateral faces 7 and 8 carry, at their lower part, two horizontal rows 27, 28 of rollers of the same diameters as the other rollers 25, 26. As for the rollers 25, 26, the rollers 27, 28 are placed on the outer face of the walls 7 and 8. All of these rollers 25 to 28 can optionally be motorized, by conventional means not shown, so as to rotate by controlled manner in the directions indicated by the arrows in Figure 2.

Entre la base de chacune des parois 7,8 et le socle 1 est ménagé, sur la quasi-totalité de la longueur de ces parois, un espace longiligne définissant pour ces parois 7,8 des lumières longitudinales inférieures 29 et 30.Between the base of each of the walls 7,8 and the base 1 is formed, over almost the entire length of these walls, a slender space defining for these walls 7,8 of the lower longitudinal slots 29 and 30.

Les rouleaux 28 et 25 servent respectivement d'enrouleur aval et de dérouleur amont pour une feuille consommable 31 en matière plastique souple, par exemple en polyéthylène de 0,05 à 0,15 millimètres d'épaisseur. De même, les rouleaux 27 et 26 servent respectivement d'enrouleur aval et de dérouleur amont pour une autre feuille consommable 32 identique à la feuille 31.The rollers 28 and 25 respectively serve as downstream winders and upstream unwinders for a consumable sheet 31 of flexible plastic material, for example from 0.05 to 0.15 mm thick polyethylene. Likewise, the rollers 27 and 26 serve respectively as downstream winders and upstream unwinders for another consumable sheet 32 identical to the sheet 31.

Le fonctionnement de cette cabine de poudrage est le suivant :The operation of this powder coating booth is as follows:

L'installation étant arrêtée, il s'agit de revêtir tout d'abord la majeure partie des parois internes de la cabine, tapis 14 excepté, avec les feuilles plastiques 31 et 32. Pour ceci, on entraîne en rotation les rouleaux 25 à 28 de façon à laisser pendre une quantité suffisante de feuille plastique 31,32, comme dessiné en traits mixtes à la figure 2. On arrête alors la rotation des rouleaux, et l'on applique, à l'aide de la turbine moyenne pression, une relativement forte dépression dans l'espace 21, par exemple de l'ordre de 200 à 300 millimètres de colonne d'eau. L'opérateur pénètre alors dans la cabine et applique manuellement les feuilles 31 et 32 contre les parois perforées 19, après avoir découpé au couteau des orifices de passage pour les pistolets automatiques 11,12. Le plaquage des feuilles plastiques contre les parois perforées 19 est assuré par la dépression existant dans l'espace 21. Bien entendu, une dépression encore plus forte est appliquée dans les tubes 23, ce qui permet, compte tenu de la bonne régularité d'aspiration assurée par les parois poreuses 24, de garantir une bonne étanchéité autour des ouvertures.The installation being stopped, it is first of all about coating the internal walls of the cabin, except carpet 14, with the plastic sheets 31 and 32. For this, the rollers 25 to 28 are rotated so as to allow a sufficient quantity of plastic sheet 31.32 to hang down, as drawn in dashed lines in FIG. 2. rotation of the rollers, and a relatively high vacuum is applied in the space 21 using the medium pressure turbine, for example of the order of 200 to 300 millimeters of water column. The operator then enters the cabin and manually applies the sheets 31 and 32 against the perforated walls 19, after having cut through the orifices for passage for the automatic pistols 11,12. Plating of the plastic sheets against the perforated walls 19 is ensured by the vacuum existing in the space 21. Of course, an even stronger vacuum is applied in the tubes 23, which allows, taking into account the good regularity of suction provided by the porous walls 24, to guarantee a good seal around the openings.

Les parois internes de la cabine étant revêtues de manière étanche par les feuilles 31,32, comme dessiné en traits pleins sur la figure 2, ou découpe éventuellement à travers l'orifice 13 un passage dans la feuille plastique pour un pistolet manuel et on met en route l'installation, en abaissant de préférence la dépression dans l'espace 21 pour diminuer le niveau sonore : on règle pour ceci la vitesse de la turbine jusqu'à obtenir une dépression de l'ordre de 120 millimètres de colonne d'eau.The internal walls of the cabin being coated in a sealed manner by the sheets 31, 32, as drawn in solid lines in FIG. 2, or optionally cutting through the orifice 13 a passage in the plastic sheet for a manual pistol and we put the installation on the way, preferably by lowering the vacuum in the space 21 to reduce the noise level: for this the turbine speed is adjusted until a vacuum of the order of 120 millimeters of water column is obtained .

Pour effectuer par la suite un changement de couleur, on relâche toutes les mises en dépression, de sorte que les feuilles 31 et 32 reprennent leur position lâche dessinée en traits mixtes à la figure 2, puis on entraîne en rotation les rouleaux 25 à 28 jusqu'à ce que les parties polluées de 31,32 soient remplacées par des parties propres. On recommence alors les opérations décrites ci-dessus.To make a change of color thereafter, all the depressions are released, so that the sheets 31 and 32 return to their loose position drawn in dashed lines in FIG. 2, then the rollers 25 to 28 are rotated up to 'that the polluted parts of 31.32 are replaced by clean parts. The operations described above are then repeated.

Bien entendu, l'invention n'est pas limitée à l'exemple de réalisation qui vient d'être décrit. Elle s'applique aussi bien à une cabine d'application manuelle à ouverture frontale, sans passage de convoyeur. La paroi intérieure perforée peut être en matière plastique ou autre matériau d'une rigidité suffisante pour résister à une dépression de quelques centimètres de colonne d'eau appliquée entre les deux parois. Les feuilles souples utilisées peuvent être en papier, en aluminium, en film plastique métallisé, ou autres. Ces feuilles peuvent être appliquées manuellement sous forme de laies séparées, si l'on ne dispose pas de dispositifs à rouleaux dérouleurs et enrouleurs. Pour une demi-cabine, on pourra utiliser une seule feuille de protection correspondant à la dimension du plafond, du plancher, de la paroi verticale et des parois des silhouettes. Il sera en général avantageux, pour faciliter la mise en place de la feuille, de prévoir des angles arrondis et de prévoir un angle supérieur à 90 degrés entre la paroi de fond et la paroi de la silhouette. A titre d'exemple de cette dernière caractéristique, les figures 5 et 6 représentent très schématiquement, en coupe transversale et en vue partielle de dessus, une variante de la cabine 1 précédente, avec ici un fond pyramidal 50 et gaine d'aspiration 51 classiques, et des angles arrondis et supérieurs à 90 degrés entre les différentes parties de la double paroi 19. Le format du film protecteur étant souvent supérieur aux dimensions des parois à protéger, l'excédent sera coupé facilement en suivant les arêtes de ces parois.Of course, the invention is not limited to the embodiment which has just been described. It applies equally well to a manual application booth with front opening, without passing a conveyor. The perforated inner wall may be made of plastic or other material of sufficient rigidity to withstand a depression of a few centimeters of column of water applied between the two walls. The flexible sheets used can be made of paper, aluminum, metallized plastic film, or the like. These sheets can be applied manually in the form of separate layers, if there are no devices with unwind rollers and reels. For a half cabin, you can use a single protective sheet corresponding to the size of the ceiling, floor, vertical wall and silhouetted walls. It will generally be advantageous, to facilitate the positioning of the sheet, to provide rounded corners and to provide an angle greater than 90 degrees between the bottom wall and the silhouette wall. As an example of this last characteristic, FIGS. 5 and 6 very schematically represent, in cross section and in partial view from above, a variant of the previous cabin 1, here with a pyramidal bottom 50 and conventional suction duct 51 , and rounded angles greater than 90 degrees between the different parts of the double wall 19. The format of the protective film is often greater than the dimensions of the walls to be protected, the excess will be easily cut by following the edges of these walls.

La cabine de poudrage représentée aux figures 7 et 8 est améliorée par rapport aux précédentes dans le sens qu'elle permet une mise en place semi-automatique du film protecteur. En outre, cette cabine est équipée de moyens mécaniques aidant au plaquage de ce film contre ses parois latérales.The powder coating booth shown in Figures 7 and 8 is improved compared to the previous ones in the sense that it allows semi-automatic positioning of the protective film. In addition, this cabin is equipped with mechanical means helping to press this film against its side walls.

Il s'agit dans cet exemple d'une cabine assez voisine de celle de la figure 5, en ce sens que l'aspiration de la poudre non déposée est effectuée par l'intermédiaire d'un tube fendu 60, de forme légèrement tronconique, qui est placé dans le fond de cette cabine. Pour le reste, cette cabine est essentiellement semblable à celle de la figure 1, à quelques différences mineures près : les rouleaux amont 25,26 et aval 27,28 sont chacun d'une seule pièce et reposent sur des supports à galets 61, la cabine a sur chaque face latérale trois ouvertures 10 de passage pour les projecteurs automatiques de poudre, et toujours une seule ouverture 13 de passage pour un projecteur manuel. A titre illustratif, on a aussi représenté en 62 les tubulures de mise en dépression de l'espace 21 précité.In this example, this is a cabin fairly close to that of FIG. 5, in the sense that the suction of the unposed powder is carried out via a split tube 60, of slightly frustoconical shape, which is placed at the bottom of this cabin. For the rest, this cabin is essentially similar to that of FIG. 1, with a few minor differences: the upstream rollers 25,26 and downstream 27,28 are each in one piece and rest on roller supports 61, the cabin has on each side face three openings 10 passage for automatic powder projectors, and always a single opening 13 passage for a manual projector. By way of illustration, there is also shown at 62 the tubes for bringing the above-mentioned space into depression 21.

En revanche, cette cabine présente deux moyens complémentaires destinés à permettre la mise en place des feuilles plastiques 31 et 32 sans qu'un opérateur n'ait à pénétrer à l'intérieur de la cabine. Ces deux moyens sont les suivants :

  • sur la partie externe de chacune des parois latérales 7,8 de la cabine sont prévues quatre portes coulissantes 63,64 qui sont suspendues à un rail commun 64 et qui sont aptes à obstruer totalement, et de manière pratiquement étanche à l'air, les quatre ouvertures 13 et 10 de passage des pistolets de poudrage.
  • à chacune des extrémités longitudinales de la cabine sont prévus deux bras verticaux 65, qui sont articulés autour d'un axe vertical 66 et qui sont rappelés, par des ressorts 67, en position d'appui contre les faces intérieures des parois 7 et 8 (voir figure 8). Des crochets de verrouillage non représentés permettent de maintenir, si on le souhaite, les bras 67 à distance de leurs parois d'appui 7 et 8 ; ces bras occupent la majeure partie de la hauteur de la cabine.
On the other hand, this cabin has two complementary means intended to allow the establishment of the plastic sheets 31 and 32 without an operator having to penetrate inside the cabin. These two means are as follows:
  • on the external part of each of the side walls 7,8 of the cabin are provided four sliding doors 63,64 which are suspended from a common rail 64 and which are capable of completely obstructing, and practically airtight, the four openings 13 and 10 for the passage of the powder spray guns.
  • at each of the longitudinal ends of the cabin are provided two vertical arms 65, which are articulated around a vertical axis 66 and which are recalled, by springs 67, in position of support against the faces inside walls 7 and 8 (see figure 8). Locking hooks not shown make it possible to maintain, if desired, the arms 67 at a distance from their bearing walls 7 and 8; these arms occupy most of the height of the cabin.

Pour effecteur le changement de couleur avec cette cabine, on écarte tout d'abord manuellement les quatre bras 65 pour libérer les feuilles 31 et 32 de leur emprise. On manoeuvre les portes coulissantes 63 et 64 pour leur permettre d'obstruer les ouvertures latérales 10,13 de passage des pistolets de poudrage (ces derniers ont été préalablement escamotés). On met alors en route les rouleaux aval motorisés 27,28 pour faire avancer les feuilles plastiques 31,32 d'une quantité suffisante. On déverrouille alors les quatre bras 65, qui viennent se plaquer contre les extrémités de ces feuilles 31,32 sous l'action des ressorts 67. Il est ainsi créé un espace d'aspiration pratiquement clos entre les feuilles 31,32 (qui sont pour le moment pendantes comme dessiné en traits mixtes sur la figure 2) et les parois internes de la cabine, de sorte que, en appliquant alors la dépression dans l'espace inter-parois 21 précité, on entraîne le plaquage automatique de ces feuilles 31,32 contre ces parois internes, ce qui représente une amélioration intéressante par rapport aux cabines précédemment décrites. A remarquer bien entendu que, quoi qu'il en soit, il sera toujours avantageux de prévoir des bras 65, même sur les cabines décrites précédemment, afin d'améliorer le maintien des feuilles 31,32 contre les parois internes de la cabine.To effect the color change with this cabin, the four arms 65 are first of all manually removed to release the sheets 31 and 32 from their grip. The sliding doors 63 and 64 are operated to allow them to obstruct the side openings 10, 13 for the passage of the powder spray guns (the latter have been previously retracted). The motorized downstream rollers 27,28 are then started up to advance the plastic sheets 31,32 by a sufficient amount. The four arms 65 are then unlocked, which are pressed against the ends of these sheets 31,32 under the action of the springs 67. This creates a practically closed suction space between the sheets 31,32 (which are for the dangling moment as drawn in dashed lines in FIG. 2) and the internal walls of the cabin, so that, by applying the vacuum in the aforementioned inter-wall space 21, the automatic plating of these sheets 31 is brought about, 32 against these internal walls, which represents an interesting improvement over the previously described cabs. Note of course that, in any event, it will always be advantageous to provide arms 65, even on the booths described above, in order to improve the retention of the sheets 31, 32 against the internal walls of the booth.

Claims (14)

1. Powder coating booth with rigid external walls and suction through the bottom, at least some of the internal surface of which is capable of being covered with a sheet of impermeable disposable flexible material, characterised in that these external walls (7, 8, 18) are lined on the inside, over all or part of their surface, by another rigid wall (19) permeable to air, the gap between these walls defining a space (21) in which a negative pressure is applied in order to ensure the application to this permeable wall (19) of each impermeable disposable flexible sheet (31, 32), suitable for covering it over all or part of its surface outside the bottom suction area.
2. Powder coating booth according to claim 1, characterised in that the width of the gap (21) between the walls is of the order of a few centimetres.
3. Powder coating booth according to claim 1 or claim 2, characterised in that it has, for the supply of a flexible sheet or sheets (31, 32), one or more unwinding (25, 26) and winding (28, 27) roller devices.
4. Powder coating booth according to one of claims 1 to 3, characterised in that at least one of the openings (9, 10, 13, 16) in the booth is at least partially bordered by a duct (23) which is suitable for being put under a negative pressure greater than the one prevailing in the space (21) between the walls, the face (24) of this duct which is directed towards the inside of the booth being formed from a porous material.
5. Powder coating booth according to one of claims 1 to 4, characterised in that the double wall (19) permeable to air has rounded corners to facilitate the application of the sheet.
6. Powder coating booth according to one of claims 1 to 5, characterised in that the flexible sheet (31, 32) is made from plastic material.
7. Booth according to claim 6, characterised in that the flexible sheet (31, 32) is made from a metallised plastic material.
8. Booth according to one of claims 1 to 5, characterised in that the flexible sheet (31, 32) is made from aluminium.
9. Booth according to one of claims 1 to 8, characterised in that it is equipped with means for applying, in the said space (21), a powerful negative pressure during the positioning of the flexible sheet (31, 32), and then a less powerful negative pressure during the use of the powder coating booth.
10. Booth according to one of claims 1 to 9, characterised in that the double wall (19) permeable to air has corners which are rounded and/or greater than 90 degrees, suitable for facilitating the positioning of the flexible sheet (31, 32).
11. Booth according to one of claims 1 to 10, characterised in that it has in addition means (63 to 67) for enabling the sheet (31, 32) to be positioned without an operator having to enter the booth.
12. Booth according to claim 11, characterised in that these means comprise devices (63, 64) for closing off the openings (10, 13) through which the powder spray guns pass.
13. Booth according to claim 12, characterised in that these closing devices consist of sliding doors (63, 64).
14. Booth according to one of claims 1 to 13, characterised in that it has, at each end, articulated arms (65) suitable for applying the ends of the sheet (31, 32) to the internal wall of the booth.
EP88420144A 1987-05-05 1988-05-04 Booth for coating objects with powder Expired - Lifetime EP0291423B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88420144T ATE74028T1 (en) 1987-05-05 1988-05-04 CABIN FOR POWDER COATING OF OBJECTS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8706679A FR2614805B1 (en) 1987-05-05 1987-05-05 POWDER CABINET FOR COATING OBJECTS
FR8706679 1987-05-05

Publications (2)

Publication Number Publication Date
EP0291423A1 EP0291423A1 (en) 1988-11-17
EP0291423B1 true EP0291423B1 (en) 1992-03-25

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EP88420144A Expired - Lifetime EP0291423B1 (en) 1987-05-05 1988-05-04 Booth for coating objects with powder

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US (1) US4924803A (en)
EP (1) EP0291423B1 (en)
AT (1) ATE74028T1 (en)
DE (1) DE3869467D1 (en)
FR (1) FR2614805B1 (en)

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US5162132A (en) * 1990-10-10 1992-11-10 Reclaim Collapsible, interchangeable spray booth apparatus and method
SE467446B (en) * 1990-11-16 1992-07-20 Ingemar Loeoef SPRAY BOX WITH RESTRICTIVE SURFACE MATERIALS
US5236506A (en) * 1991-07-03 1993-08-17 Russell Mazakas Method for installing a portable spray booth liner
US5240504A (en) * 1991-07-03 1993-08-31 Russell Mazakas Spray booth liner
US5229171A (en) * 1991-12-23 1993-07-20 Research Triangle Institute Apparatus and method for uniformly coating a substrate in an evacuable chamber
US5248524A (en) * 1992-01-27 1993-09-28 Paragon Trade Brands Method and apparatus for zoned application of particles in fibrous material with dual dispensing nozzles
AU671437B2 (en) * 1992-07-15 1996-08-29 Brain Flash-Patententwicklungs Gmbh Spraying device
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EP0839581A1 (en) * 1996-11-02 1998-05-06 Josef Hasler Powder coating booth comprising flexible inner liner
DE19645261A1 (en) * 1996-11-02 1998-05-07 Gema Volstatic Ag Device for spray coating objects
US6730167B2 (en) 2000-10-05 2004-05-04 Nordson Corporation Powder coating spray booth with a powder extraction system
US6866717B2 (en) * 2000-10-05 2005-03-15 Nordson Corporation Powder coating spray booth with air curtain
ITVI20020177A1 (en) * 2002-08-05 2004-02-06 Ind Meccaniche Bergi Ofb Spa PLANT FOR THE PURIFICATION OF SMOKES, VAPORS AND OTHER SUSPENSION POLLUTING SUBSTANCES.
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CN100460083C (en) * 2006-05-17 2009-02-11 裕东(中山)机械工程有限公司 Powder-spraying chamber for electrostatic powder spray coated
US20090283031A1 (en) * 2008-05-16 2009-11-19 Michael Grasso Portable shake sprayer assembly
US9358566B2 (en) * 2012-05-18 2016-06-07 Pem, Inc. In-line pretreatment system for machine parts
DE102012211135A1 (en) * 2012-06-28 2014-01-02 Dürr Systems GmbH Sealing device for slot-shaped aperture extending in longitudinal direction in e.g. wall of paint spray booth in workpieces coating system, has seal elements arranged movably supported at holding device that is fixed stationary to wall
CN104998792A (en) * 2015-07-30 2015-10-28 芜湖市海联机械设备有限公司 Remaining mist treatment device for bearing cleaning line
FR3041549A1 (en) * 2015-09-28 2017-03-31 Patrice Ruez ASPERSION CABIN
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Also Published As

Publication number Publication date
FR2614805A1 (en) 1988-11-10
FR2614805B1 (en) 1989-10-20
DE3869467D1 (en) 1992-04-30
US4924803A (en) 1990-05-15
ATE74028T1 (en) 1992-04-15
EP0291423A1 (en) 1988-11-17

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