EP0321693B1 - Procédé pour réduire les influences ambiantes sur le revêtement par pulvérisation d'un objet et appareil pour le revêtement par pulvérisation - Google Patents

Procédé pour réduire les influences ambiantes sur le revêtement par pulvérisation d'un objet et appareil pour le revêtement par pulvérisation Download PDF

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Publication number
EP0321693B1
EP0321693B1 EP88118916A EP88118916A EP0321693B1 EP 0321693 B1 EP0321693 B1 EP 0321693B1 EP 88118916 A EP88118916 A EP 88118916A EP 88118916 A EP88118916 A EP 88118916A EP 0321693 B1 EP0321693 B1 EP 0321693B1
Authority
EP
European Patent Office
Prior art keywords
powder
chamber
air
coating
powder coating
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
Application number
EP88118916A
Other languages
German (de)
English (en)
Other versions
EP0321693A2 (fr
EP0321693A3 (en
Inventor
Hans Nussbaumer
Felix Walser
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Elpatronic AG
Original Assignee
Prazisions-Werkzeuge AG
Praezisions Werkzeuge AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Prazisions-Werkzeuge AG, Praezisions Werkzeuge AG filed Critical Prazisions-Werkzeuge AG
Publication of EP0321693A2 publication Critical patent/EP0321693A2/fr
Publication of EP0321693A3 publication Critical patent/EP0321693A3/de
Application granted granted Critical
Publication of EP0321693B1 publication Critical patent/EP0321693B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
    • B05D1/12—Applying particulate materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
    • B05B13/06—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00 specially designed for treating the inside of hollow bodies
    • B05B13/0618—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00 specially designed for treating the inside of hollow bodies only a part of the inside of the hollow bodies being treated
    • 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
    • B05B16/60—Ventilation arrangements specially adapted therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/16—Arrangements for supplying liquids or other fluent material
    • B05B5/1683—Arrangements for supplying liquids or other fluent material specially adapted for particulate materials

Definitions

  • the present invention relates to a method according to the preamble of claim 1, a powder coating system according to that of claim 7 and the use thereof.
  • the invention sets itself the goal of at least reducing influences of the environment on the result of the coating process, which is achieved in the method of the type mentioned above by its formation according to the characterizing part of claim 1.
  • the first priority is to do this in the coating zone itself, i.e. where the powder is dispensed and applied to the workpiece, an environment which can be controlled thereby preferably being maintained with respect to the workpiece with the powder application until the powder layer to be produced can no longer be impaired by changing environmental influences.
  • the extracted powder is usually fed to the powder dispenser in a conveyor circuit.
  • the powder that is always in a closed loop here is again issued at the coating zone, which is usually freely communicating with the immediate surroundings, becomes more and more dirty there and also absorbs more and more moisture.
  • Even if the problem of the powder, which is becoming increasingly humid, can at best be managed with relatively great effort in a powder preparation system, it is not possible to keep the powder, which has been dispensed again and again, with reasonable effort in the mentioned conveyor circuit. For this reason, particular importance is attached to a preferred embodiment variant of the method according to the invention. An otherwise necessary powder reprocessing plant or stage becomes superfluous.
  • the air flow is generated from the chamber by supplying more conditioned air to the chamber per unit time than air is suctioned off.
  • the mentioned balance of conditioned air supplied to the chamber and air discharged from the chamber can also be influenced in the sense mentioned, that the air flow is generated by conditioned air which is introduced into the chamber in addition to the conditioned conveying air.
  • the powder is primarily charged in one polarity and is electrostatically repelled by the chamber. This is preferably carried out when the powder coating is carried out with electrostatic support, in that an electrostatic field is generated in the region of the workpiece, the output powder is charged and is driven against the workpiece by the force of the field.
  • a metallized inner wall of the chamber mentioned which is insulated from the outside to protect against contact, is placed at the same electrical potential as an electrode in the coating zone, which together with the workpiece placed at the corresponding potential, the electrostatic field for applying the powder generated.
  • a powder coating installation according to the invention in which environmental influences are reduced, is characterized according to the wording of claim 7.
  • Preferred embodiments of this system are specified in claims 8 to 15.
  • the method according to the invention and the powder coating system according to the invention are particularly suitable for the interior coating of hollow bodies according to claim 16, and in particular also for the seam coating of can body longitudinal weld seams according to claim 17, which usually takes place immediately after a welding system, where the contamination mentioned at the outset is relatively pronounced.
  • the method or the coating system mentioned can also be used for all-round internal coatings of hollow bodies.
  • a powder coating system comprises an air conditioning system 1, in which ambient air is conditioned, for example kept at a predetermined atmospheric humidity and / or cleaned of dust, oil particles, etc.
  • the ambient air L K conditioned in the system 1 is supplied by a conveying device 3, such as a blower, to a mixing system 5, for example with a diffuser as shown schematically, on which a powder storage container 7 supplied fresh powder P F , if necessary via a quantity control device 9, is mixed with the conditioned air L K supplied with it.
  • the conditioned air L K is used to feed fresh powder P F via a feed line 11 to an outlet 13 in a coating zone 15 and to dispense it there.
  • a workpiece 17 to be coated such as a can body to be coated on the inside or outside, the longitudinal weld seam of which is to be powder-coated, is fed to the coating zone 15 by means of a schematically illustrated conveying device 19 and, after the coating process has ended, is retrieved in the same way either, as indicated by the double arrow A. or, in the case of a process which is continuous in one direction, as shown by the arrow B, is conveyed further from the coating zone 15 in the same direction.
  • a conditioning chamber 21 which, in particular, envelops the coating zone 15 and possibly also a predetermined section within which the workpiece 17 is moved after a freshly applied coating.
  • This additional distance which is at most also encased by the conditioning chamber 21, can also include further units, such as a first heating stage, by means of which the applied plastic powder layer on the workpiece 17 is heated to form a closed film or film strip.
  • the conditioning chamber 21 has, in the case of a pendulum feed according to double arrow A, an opening 23 through which the workpiece 17 is conveyed to and away from the coating zone 15 by means of the conveying device 19. If the workpiece 17 is conveyed in continuous operation in one direction, according to arrow B to the coating zone 15 and away from it, the conditioning chamber 21, as shown in dashed lines, has a second opening 23 through which the coated workpiece is then conveyed by means of the conveyor device 19 17 is promoted.
  • the conditioning chamber 21 With the provision of the conditioning chamber 21 it is achieved that, neglecting the powder quantity pro PF supplied per unit of time due to the conditioned conveying air quantity ⁇ LK supplied from the output 13 per unit of time, a flow S of conditioned air L K from one or both of the openings 23 provided is maintained which prevent unconditioned air, contaminated and / or undesirable uncontrolled atmospheric humidity, from the environment U, in particular into the coating zone 15.
  • the amount of conditioned conveying air supplied to the chamber 21 per unit of time via the feed line 11 is to be set per se at the coating zone 15 primarily because of the requirements of the coating process. If this conditioned conveying air quantity supplied to the chamber 21 with a view to a desired coating process is therefore not sufficient to ensure a sufficient flow S from one or both openings 23, the conditioning chamber 21 is additionally conditioned by the conveying device 3 and by the conditioning system 1 K fed, with which the flow S can now be set to a sufficient value regardless of the coating process.
  • FIG. 2 schematically shows a coating system according to the invention, as shown in FIG. 1. Identical parts or functional blocks are provided with the same reference numbers as in FIG. 1.
  • a return suction 25 is provided in the area of the outlet 13, downstream and / or upstream, which is guided to a corresponding suction unit 27, such as a pump. With this suction 25, powder which has not adhered to the workpiece 17 is sucked back with conditioned air L K.
  • the powder sucked back with conditioned air from the suckbacks 25 and 29 is again fed to the feed line 11 in order to be discharged again in a closed circuit at the outlet 13 against the workpiece 17.
  • the back-sucked powder P which is no longer fresh, is mixed with the fresh powder P F from the powder container 7, for example, in a metering device or a mixer 33.
  • the balance per time unit is favored by conditioned air ⁇ LKin fed to the chamber 21 via the feed line 11 and the amount of air sucked back by the suckbacks 25 and 29 per time unit ⁇ LKout of the amount introduced into the chamber 21 is chosen to be positive.
  • a conditioning air line is additionally proposed here from the conveying device 3 35 provide, with the help of additional conditioned air L K , in the sense of positively influencing the above balance, is fed into the chamber 21.
  • the flow S is generated from the openings 23 of the chamber 21 provided exclusively by conditioned air, which means that a relatively powerful conditioning system 1 is provided.
  • FIG. 3 schematically shows a further embodiment variant that can be used on both arrangements according to FIGS. 1 and 2 to generate the flow S.
  • the same reference numerals are used here for the same parts.
  • all elements of the system according to FIGS. 1 and 2 that are not necessary to explain the procedure for generating the flow S according to the invention are omitted.
  • a nozzle arrangement 37 is provided in the region of the opening 23, for example a slot nozzle arrangement along the periphery of said opening 23 or a plurality of individual nozzles, which are fed together through a channel 39.
  • a jet 43 emerges from the one or more nozzles 41 as a free jet. Characterized in that the jet 43 is directed at least in a component S 'transversely to the nozzle opening 23, air is torn from the interior of the chamber 21 by the jet formation and conveyed into the environment: This creates the desired flow S from the opening 23.
  • the jet 43 from the nozzle arrangement 37 can now be generated by means of a delivery unit 45 with ambient air L U , with which the delivery unit 45 is arranged in the immediate vicinity of the chamber 21 only short lines 47 are necessary, and less conditioned air L K is used for the flow S.
  • the jet 43 has a suction effect on the interior of the chamber 21 according to the jet pump principle.
  • FIG. 4 schematically shows a preferred embodiment variant of a coating system according to the invention, working according to the method according to the invention, designed for the internal coating of welded metal cans.
  • the feed line 11 and the back suction 25 are arranged in a cantilevered working arm 49 which, in FIG. 4, is attached to a welding station for said longitudinal weld seam on the left hand and projects from there to the right.
  • welded can bodies 51 along their longitudinal edges are moved by means of a conveying device, not shown here, in the direction of arrow B over the arm 49, with respect to the openings of the feed line 11 or the back suction 25 at a distance.
  • the weld seam area 53 of the can body 51 is coated by the powder discharged from the line 11 by means of conditioned air L K. Excess powder which falls back from the can body 51 is, as mentioned, sucked back through the suction 25 and the powder which is dispensed upwards between the can bodies 51 which follow in rapid succession is sucked off by the suction 29.
  • the conditioning chamber 21 surrounds in particular the coating zone 15 and possibly also a part of the downstream heating units, not shown in FIG. 4, with the aid of which the applied powder layer is melted.
  • the chamber 21 is supplied with additional conditioned air L K through the conditioning air line 35 in such a way that, according to the invention, a flow S takes place from the openings 23 of the conditioning chamber 21.
  • an electrode 55 is arranged in the area of the outlet 13, which electrode is set to a high electrostatic potential V with respect to ground, while the can body 51 is connected to ground, for example via the transport device (not shown). This creates a high electrostatic field in the coating zone 13, which is directed in such a way that, whether due to friction in the feed line 11 and / or the effect of the electrode 55, powder particles charged primarily with one polarity, driven by the force of the field against the can body and be held there.
  • the latter and in particular its inner wall area is also set to an electrostatic potential, such as to the electrostatic potential V of the electrode 55, as a result of which in the wall area of the conditioning chamber 21 field E repelling charged powder particles.
  • an electrostatic potential such as to the electrostatic potential V of the electrode 55
  • the outer wall of the chamber 21 is provided with an insulating jacket.
  • the line 35 is galvanically decoupled from the chamber 21, as are other organs and parts which are in contact with it and lead to the outside.
  • the method or the coating arrangement it is achieved that, without complex precautions, environmental influences cannot have an effect on the quality of the powder coating and a consistently controlled coating can be carried out.

Landscapes

  • Application Of Or Painting With Fluid Materials (AREA)
  • Electrostatic Spraying Apparatus (AREA)
  • Coating Apparatus (AREA)
  • Details Or Accessories Of Spraying Plant Or Apparatus (AREA)
  • Nozzles (AREA)
  • Prevention Of Fouling (AREA)
  • Pigments, Carbon Blacks, Or Wood Stains (AREA)

Claims (18)

  1. Procédé de revêtement par poudre de pièces en réduisant les influences ambiantes sur le revêtement, dans lequel on fait passer les pièces en série l'une derrière l'autre dans une zone de revêtement, dans laquelle on pulvérise sur les pièces un jet de poudre entraîné par un courant d'air et on aspire la poudre en excès, caractérisé en ce que la zone de revêtement est entourée d'un chambre ouverte à chaque extrémité pour laisser passer les pièces et qu'on produit un courant d'air de la chambre vers l'environnement et que la poudre est apportée aux pièces au moyen d'air conditionné.
  2. Procédé selon la revendication 1, caractérisé en ce qu'on produit un courant d'air, dans lequel, par unité de temps, on introduit plus d'air conditionné dans la chambre qu'on aspire d'air.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce qu'en plus on introduit de l'air conditionné dans la chambre.
  4. Procédé selon l'une ou plusieurs des revendications 1 à 3, caractérisé en ce qu'on extrait de l'air dans le domaine d'au moins un orifice de chambre de sorte que, par effet de pompe à jet dans la chambre, on crée un courant d'air (S) conditionné dans cet orifice vers l'extérieur.
  5. Procédé selon l'une ou plusieurs des revendications 1 à 4, caractérisé en ce que la poudre et chargée préférentiellement électriquement d'une polarité et qu'elle est repoussée électrostatiquement par la chambre.
  6. Procédé selon l'une ou plusieurs des revendications 1 à 5, caractérisé en ce qu'on recycle la poudre aspirée vers la zone de pulvérisation de poudre.
  7. Unité de revêtement par poudre avec une zone de revêtement dans laquelle on prévoit un dispositif de pulvérisation pour déposer de la poudre entraînée par de l'air sur une pièce à recouvrir ainsi qu'un dispositif de recyclage par aspiration pour entraîner et recycler de la poudre en excès, et avec des moyens de convoyage pour entraîner des pièces par passage dans la zone de revêtement, en face du dispositif de pulvérisation et du dispositif d'aspiration et de recyclage, et pour les faire sortir de la zone de revêtement, caractérisée en ce qu'on place la zone de revêtement (15) dans une chambre (21), qui est ouverte de chaque côté pour laisser le passage des pièces (17) et à laquelle on adjoint des moyens de production d'un courant d'air (S) sortant de la chambre (21) vers l'environnement, et que le dispositif de pulvérisation (13) est relié à un dispositif (1) qui conditionne l'air véhiculant la poudre.
  8. Unité de revêtement par poudre selon la revendication 7, caractérisée en ce que les moyens de production du courant d'air (S) entourent le dispositif de pulvérisation (13).
  9. Unité de revêtement par poudre selon la revendication 7 ou 8, caractérisée en ce qu'au moins une autre conduite (35) d'air conditionné (LK) débouche dans la chambre (21) pour produire le courant d'air (S).
  10. Unité de revêtement par poudre selon l'une ou plusieurs des revendications 7 à 9, caractérisée en ce que les moyens de production du courant d'air (S) comprennent un dispositif de buse (37) dans le domaine d'au moins un orifice (23) de la chambre (21), ce dispositif est constitué de telle façon que, par son effet de jet (43), de l'air est entraîné de la chambre (21) vers l'extérieur.
  11. Unité de revêtement par poudre selon l'une ou plusieurs des revendications 7 à 10, caractérisée en ce que le dispositif de pulvérisation (13) est disposé sur un bras en saillie pénétrant dans la chambre (49).
  12. Unité de revêtement par poudre selon la revendication 11, caractérisé en ce qu'on prévoit sur le bras (49) au moins une partie du dispositif d'aspiration en recyclage (25) et qu'il est lié en recyclage au dispositif (13) de pulvérisation.
  13. Unité de revêtement par poudre selon l'une des revendications 11 ou 12, caractérisée en ce qu'une partie (29) du dispositif d'aspiration en recyclage est disposée en face du dispositif de pulvérisation (13).
  14. Unité de revêtement par poudre selon l'une ou plusieurs des revendications 7 à 13, caractérisée en ce que le dispositif de pulvérisation (13) a une implantation de buses en symétrie axiale pour recouvrir de poudre l'intérieur de corps creux.
  15. Unité de revêtement par poudre selon l'une ou plusieurs des revendications 7 à 14, caractérisée en ce qu'on prévoit des moyens (V) pour Créer dans le domaine de la paroi de chambre (21) un champ électrique (E) qui repousse la poudre.
  16. Utilisation du procédé selon l'une des revendications 1 à 6 ou de l'unité de revêtement par poudre selon l'une des revendications 7 à 15 pour recouvrir l'intérieur de corps creux.
  17. Utilisation selon la revendication 16, pour le revêtement de soudure de lignes de soudures longitudinales de corps de boîtes.
  18. Utilisation du procédé selon l'une des revendications 1 à 6 en revêtement par poudre, dans lequel on recycle la poudre en excès dans un circuit de transfert.
EP88118916A 1987-12-23 1988-11-14 Procédé pour réduire les influences ambiantes sur le revêtement par pulvérisation d'un objet et appareil pour le revêtement par pulvérisation Expired - Lifetime EP0321693B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873743864 DE3743864A1 (de) 1987-12-23 1987-12-23 Verfahren zur reduzierung von umgebungseinfluessen auf die pulverbeschichtung eines werkstueckes und pulverbeschichtungsanlage
DE3743864 1987-12-23

Publications (3)

Publication Number Publication Date
EP0321693A2 EP0321693A2 (fr) 1989-06-28
EP0321693A3 EP0321693A3 (en) 1990-05-02
EP0321693B1 true EP0321693B1 (fr) 1994-07-27

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ID=6343471

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88118916A Expired - Lifetime EP0321693B1 (fr) 1987-12-23 1988-11-14 Procédé pour réduire les influences ambiantes sur le revêtement par pulvérisation d'un objet et appareil pour le revêtement par pulvérisation

Country Status (7)

Country Link
US (1) US5061510A (fr)
EP (1) EP0321693B1 (fr)
JP (1) JP2522695B2 (fr)
AT (1) ATE109032T1 (fr)
CA (1) CA1307928C (fr)
DE (2) DE3743864A1 (fr)
ES (1) ES2058217T3 (fr)

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FR2705591B1 (fr) * 1993-05-24 1995-08-11 Sames Sa Procédé et dispositif d'alimentation d'une installation de projection de produit pulvérulent.
DE19625099A1 (de) * 1996-06-24 1998-01-02 Heidelberger Druckmasch Ag Verfahren zum Pudern einer bedruckten Oberfläche eines Bedruckstoffes
US6607573B1 (en) 1997-02-06 2003-08-19 Northrop Grumman Corporation Portable air pollution control apparatus
US6143048A (en) * 1997-02-06 2000-11-07 Northrop Grumman Corporation Portable air pollution capture apparatus with painting tray
US6146687A (en) * 1998-11-24 2000-11-14 Gillette Canada Inc. Method of coating a fiber
US6264743B1 (en) * 1999-10-29 2001-07-24 Nordson Corporation Vacuum assisted overspray controller and method
US7014808B2 (en) * 2002-03-05 2006-03-21 The Coca-Cola Company Method and apparatus for coating the interior surface of a straw
CA2537348A1 (fr) * 2006-02-22 2007-08-22 Shawcor Ltd. Methode de revetement de tuyaux ayant un cordon de soudure
JP4664344B2 (ja) * 2007-10-31 2011-04-06 旭サナック株式会社 粉体塗装装置
ITFI20120205A1 (it) * 2012-10-10 2014-04-11 Eurosider Sas Di Milli Ottavio & C Metodo e apparato per la verniciatura elettrostatica
EP2799152B8 (fr) * 2013-05-03 2016-02-24 Oerlikon Metco AG, Wohlen Dispositif de traitement destiné à traiter une surface de pièce
CN104275263B (zh) * 2014-08-06 2017-02-08 裕东（中山）机械工程有限公司 一种半围闭、可变风速展翼式喷粉室
CN106824644A (zh) * 2016-12-30 2017-06-13 天津赛智科技发展有限公司 一种循环风结构的喷漆房
CN112718281B (zh) * 2019-10-14 2022-07-19 上海中国弹簧制造有限公司 弹簧静电喷粉系统

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EP0268126A1 (fr) * 1986-11-15 1988-05-25 Präzisions-Werkzeuge AG Procédé pour augmenter la quantité de poudre délivrée à un appareil de revêtement à poudre, et appareil de revêtement à poudre

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Publication number Priority date Publication date Assignee Title
CH603249A5 (fr) * 1976-02-20 1978-08-15 Hero Conserven
US4205621A (en) * 1979-01-08 1980-06-03 The Continental Group, Inc. System for inside powder striping of welded food cans
EP0268126A1 (fr) * 1986-11-15 1988-05-25 Präzisions-Werkzeuge AG Procédé pour augmenter la quantité de poudre délivrée à un appareil de revêtement à poudre, et appareil de revêtement à poudre

Also Published As

Publication number Publication date
EP0321693A2 (fr) 1989-06-28
ES2058217T3 (es) 1994-11-01
JPH01207155A (ja) 1989-08-21
EP0321693A3 (en) 1990-05-02
DE3743864C2 (fr) 1992-03-19
JP2522695B2 (ja) 1996-08-07
DE3850868D1 (de) 1994-09-01
US5061510A (en) 1991-10-29
CA1307928C (fr) 1992-09-29
DE3743864A1 (de) 1989-07-06
ATE109032T1 (de) 1994-08-15

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