EP0123967B1 - Spray booth for electrostatic powder coating - Google Patents

Spray booth for electrostatic powder coating Download PDF

Info

Publication number
EP0123967B1
EP0123967B1 EP84103862A EP84103862A EP0123967B1 EP 0123967 B1 EP0123967 B1 EP 0123967B1 EP 84103862 A EP84103862 A EP 84103862A EP 84103862 A EP84103862 A EP 84103862A EP 0123967 B1 EP0123967 B1 EP 0123967B1
Authority
EP
European Patent Office
Prior art keywords
cabin
spray
cabin according
spray cabin
layer
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
Application number
EP84103862A
Other languages
German (de)
French (fr)
Other versions
EP0123967A1 (en
Inventor
Gerhard Friedrich Vöhringer
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.)
Esb Elektrostatische Sprueh- und Beschichtungsanlagen Gf Vohringer GmbH
Original Assignee
Esb Elektrostatische Sprueh- und Beschichtungsanlagen Gf Vohringer GmbH
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 Esb Elektrostatische Sprueh- und Beschichtungsanlagen Gf Vohringer GmbH filed Critical Esb Elektrostatische Sprueh- und Beschichtungsanlagen Gf Vohringer GmbH
Publication of EP0123967A1 publication Critical patent/EP0123967A1/en
Application granted granted Critical
Publication of EP0123967B1 publication Critical patent/EP0123967B1/en
Expired legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/08—Plant for applying liquids or other fluent materials to objects
    • B05B5/087—Arrangements of electrodes, e.g. of charging, shielding, collecting electrodes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B16/00—Spray booths
    • B05B16/40—Construction elements specially adapted therefor, e.g. floors, walls or ceilings

Definitions

  • the invention relates to a spray booth for electrostatic powder coating systems, the supporting wall of which is composed of individual, possibly attached to a supporting frame, grounded plate elements and provided on the inside with a coating forming a smooth boundary surface.
  • the invention is based on the spray booth specified at the outset and pursues the task of developing this booth in the simplest possible manner in such a way that powder particles are largely prevented from becoming stuck in the corners and cracks of the booth wall, thereby making it easier and faster to clean the booth for changing colors.
  • the coating is formed according to the invention by individual sheet-like laminate bodies made of electrically insulating material with a layer thickness of at least 0.5 mm joined together at their edges with a smooth surface.
  • the entire inner surface of the cabin not only so smooth that it can be completely cleaned very quickly with a scraper or vacuum cleaner.
  • a particular advantage of the insulating laminate on a metal structure is that the earthing mainly affects the outer surface, whereas a limited voltage can build up on the inner surface.
  • the inner surface assumes the same polarity of the sprayed powder, which has the consequence. that incoming powder particles are repelled. in any case, there is no tendency towards electronic liability. In this way the formation of an otherwise up to 10 mm thick powder layer on the cabin walls is prevented.
  • the voltage potential can thus be determined by the electrical resistance between the inner surface of the coating and the conductive, grounded plate elements. Furthermore, the resistance to the reduction of this voltage potential after switching off the charging voltage is predetermined by this resistor. This also limits the electrical energies of the wall to such an extent that dangerous sudden discharges are avoided.
  • two otherwise identical powder spray booths 2 and 3 are flanged to one another by 180 degrees. They each have a side frame 5 above a base frame 4 with an injection opening 6 and 7 with a connection opening 8 for a recovery unit 9, each two has hanging filter cartridges 11. These, like the fan arranged above, are suspended on one of the two ceiling parts 12.13. Between these ceiling parts, a slot 14 is formed for the implementation of a transport path, on which workpieces can be transported hanging through the cabins 2 and 3 and the connecting shafts 16 within the transport opening 15.
  • the cabin walls are formed by individual metallic profile plate elements 17 which are folded twice at their edges, joined together with their edge parts 18 and connected by screws 19.
  • the plate elements assembled in this way are connected to a plurality of earth connections 21 and together form a self-supporting cabin housing which acts as an earth cage. However, they can also be attached to a separate support structure.
  • the laterally joined plate elements 17 form a common inner plate 22, which is continuous except for the crack caused by rounding at the connection points, on which a coating 24 of insulating material is applied by means of an adhesive layer 23 made of insulating adhesive.
  • This coating should have a thickness of at least 0.5 mm and can consist of a suitable plastic such as PVC, Teflon, polyethylene or nylon.
  • the overall coating can be formed according to FIG. 4 by foils 25 in the form of individual webs, which either lie close together with their edges along a joint 26, possibly glued, or the edges are connected by a butt weld seam 27.
  • the film itself can also cover unevenness and be rounded in the corners, as can be seen in FIG. 5.
  • There the same film 25 of the coating of a uniform curve 28 is guided along the corner between two plates 171 and 172. In the case of thicker foils, this can possibly be done without support.
  • separate shaped bodies, such as a fillet strip 29, should be interposed on the back, and the adhesive layer 23 is also guided over this curve on the back of the film.
  • the coating is made of a harder material or has a greater thickness.
  • This weld seam like the weld seam 27, can be ground on its exposed outer surface in order to smooth unevenness.
  • fillet strips 34 are used as shown in FIG. 7. the ends 35 of which run out in the thickness of the plates 31 and are connected to them by welds 36. This is particularly recommended for thicker panels over 1.8 mm, especially in the order of 2.4 mm to 3 mm.
  • the resistance between the exposed inner surface 37 of the coating and the back of the adhesive layer 23 changes for a given electrical behavior of the layer material. However, this resistance determines how quickly the voltage absorbed by the inner surface 37 is dissipated to the ground connection 21 is or to what voltage the inner surface 37 can be charged.
  • the inner surface 37 assumes at least to a limited extent the same polarity as the sprayed powder particles during the spraying process. A counter-radiation then builds up on the inner surface 37, which results in a back-spraying, but in any case a rejection of all particles charged with the same polarity or all particles not deposited on the material.
  • the powder deposits thus prevented on the cabin walls in turn contribute to the easier and faster cleaning possibility of the cabin. If all edges are sufficiently rounded, you can get by without a vacuum cleaner and the entire wall can only be cleaned with a scraper, wiper or the like. But this can be done by a person in a few minutes.

Landscapes

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

Description

Die Erfindung betrifft eine Sprühkabine für elektrostatische Pulverbeschichtungsanlagen, deren tragende Wandung aus einzelnen, ggf. an einem Traggerüst angebrachten leitfähigen, geerdeten Plattenelementen zusammengesetzt und innen mit einer eine glatte Begrenzungsfläche bildenden Beschichtung versehen ist.The invention relates to a spray booth for electrostatic powder coating systems, the supporting wall of which is composed of individual, possibly attached to a supporting frame, grounded plate elements and provided on the inside with a coating forming a smooth boundary surface.

Bei derartigen bekannten elektrostatischen Pulverbeschichtungsanlagen ist es von wesentlicher Bedeutung, daß der Innenraum der Kabine möglichst schnell und gründlich gereinigt werden kann. Dies insbesondere zum Farbwechsel. Man ist daher bestrebt, das Kabinengehäuse aus möglichst glatt aneinandergefügten Blechen zu bilden. Dabei kommen in herkömmlicher Technik meist an ihren Rändern scharf abgekantete Bleche zur Anwendung, die mit ihren Randflanschen zusammengeschraubt werden. Auch bei noch so scharfer Abkantung bilden sich an den Anschlußstellen stets Ritzen, in welchen sich Restpulver hält. Dies gilt auch für das Zusammennieten und selbst das Anschweißen, da die metallische Schweißstelle verhältnismäßig rauh ist. Die Reinigung der Kabine erfordert dann stets ungewöhnlichen Zeitaufwand.In such known electrostatic powder coating systems, it is essential that the interior of the cabin can be cleaned as quickly and thoroughly as possible. This is especially true for changing colors. It is therefore endeavored to form the cabin housing from sheets that are joined together as smoothly as possible. In conventional technology, sharp edges are usually used at their edges, which are screwed together with their edge flanges. Even with the sharpest bend, cracks always form in the connection points, in which residual powder is retained. This also applies to riveting together and even welding, since the metallic weld is relatively rough. Cleaning the cabin then always takes an unusual amount of time.

Gemäß DE 25 55 067A hat man schon versucht, die Ritzen zwischen den einzelnen Metallteilen ebenso auszuspachteln wie die ganze Innenfläche der Kabine. Da jedoch die Haftfläche zu klein ist, löst sich die Spachtelmasse verhältnismäßig schnell. Dieses Verfahren ist auch insoweit mit einem Unsicherheitsfaktor verbunden, als die Gleichförmigkeit der Beschichtung hinsichtlich ihrer Stärke und ihrer Ebenflächigkeit nur schwer zu gewährleisten ist.According to DE 25 55 067A, attempts have already been made to fill in the cracks between the individual metal parts as well as the entire inner surface of the cabin. However, since the adhesive surface is too small, the filler dissolves relatively quickly. This method is also associated with an uncertainty factor insofar as it is difficult to ensure the uniformity of the coating with regard to its thickness and flatness.

Die Erfindung geht aus von der eingangs angegebenen Sprühkabine und verfolgt die Aufgabe, diese Kabine auf möglichst einfache Weise so weiterzubilden, daß ein Festsetzen von Pulverpartikeln in Ecken und Ritzen der Kabinenwandung weitgehend verhindert und dadurch die Reinigung der Kabine zum Farbwechsel gefahrlos erleichtert und beschleunigt wird.The invention is based on the spray booth specified at the outset and pursues the task of developing this booth in the simplest possible manner in such a way that powder particles are largely prevented from becoming stuck in the corners and cracks of the booth wall, thereby making it easier and faster to clean the booth for changing colors.

Zur Lösung dieser Aufgabe wird erfindungsgemäß die Beschichtung durch einzelne an ihren Rändern glattflächig miteinander verbundene flächenhafte Schichtkörper aus elektrisch isolierendem Werkstoff mit einer Schichtstärke von mindestens 0.5 mm gebildet.To achieve this object, the coating is formed according to the invention by individual sheet-like laminate bodies made of electrically insulating material with a layer thickness of at least 0.5 mm joined together at their edges with a smooth surface.

Es kann so ohne bemerkenswerten Aufwand die ganze Innenfläche der Kabine nicht nur so glattflächig gestaltet werden, daß sie sich mit Schaber oder Staubsauger sehr schnell vollständig reinigen läßt. sondern ein besonderer Vorteil der isolierenden Schichtkörper auf metallischem Tragwerk liegt darin, daß die Erdung sich vornehmlich an der Außenfläche auswirkt, an den Innenfläche dagegen sich eine begrenzte Spannung aufbauen kann. Durch das elektrostatische Feld und unmittelbar dort auftreffende Ladungsträger nimmt daher die Innenfläche die gleiche Polarität des versprühten Pulvers an, was zur Folge hat. daß ankommende Pulverpartikel abgestoßen werden. jedenfalls aber keine Tendenz zur elektronischen Haftung entsteht. Auf diese Weise wird die Bildung einer sonst bis zu 10 mm dicken Pulverschicht an den Kabinenwänden verhindert.It can be so designed that the entire inner surface of the cabin not only so smooth that it can be completely cleaned very quickly with a scraper or vacuum cleaner. but a particular advantage of the insulating laminate on a metal structure is that the earthing mainly affects the outer surface, whereas a limited voltage can build up on the inner surface. As a result of the electrostatic field and the charge carriers hitting directly there, the inner surface assumes the same polarity of the sprayed powder, which has the consequence. that incoming powder particles are repelled. in any case, there is no tendency towards electronic liability. In this way the formation of an otherwise up to 10 mm thick powder layer on the cabin walls is prevented.

Durch den elektrischen Widerstand zwischen der Innenfläche der Beschichtung und den leitfähigen geerdeten Plattenelementen läßt sich damit das Spannungspotential bestimmen. Ferner ist durch diesen Widerstand die Zeit bis zum Abbau dieses Spannungspotentials nach Abschalten der Aufladespannung vorgegeben. Damit lassen sich auch die elektrischen Energien der Wandung soweit begrenzen, daß gefährliche schlagartige Entladungen vermieden werden.The voltage potential can thus be determined by the electrical resistance between the inner surface of the coating and the conductive, grounded plate elements. Furthermore, the resistance to the reduction of this voltage potential after switching off the charging voltage is predetermined by this resistor. This also limits the electrical energies of the wall to such an extent that dangerous sudden discharges are avoided.

Die Verwendung von Kunststoffen oder anderem elektrisch isolierenden Material für die Wandungen in Spritzkabinen für elektrostatische Sprühanlagen und damit die Aufladung der Innenseite der Kabinenwandung mit der Polarität des elektrostatischen Feldes ist an sich durch die DE-AS 10 50 693 bekannt, ebenso die Abdeckung der Wandung einer aus leitendem Material gebildeten Kabine, etwa mit einer dünnen Schicht eines isolierenden Werkstoffes wie Papier. Dort ist aber keine leitende Verbindung zu den geerdeten Kabinenteilen vorgegeben. Es wird vielmehr besonderer Wert darauf gelegt, etwa eine zur Abschirmung verwendete Folie gut gegen Erdpotential zu isolieren, um ein Abfließen der aufgebrachten Ladung zu verhindern. Auch auf diese Weise läßt sich ein Abweisen des Sprühgutes an den Kabinenwänden erreichen, aber durch die vollständige Isolierung gegenüber Erdpotential ergibt sich eine erhebliche Gefahr des Aufbaues von elektrischer Entladungsenergie, die auch noch längere Zeit nach Abschalten des elektrischen Feldes erhalten bleibt.The use of plastics or other electrically insulating material for the walls in spray booths for electrostatic spraying systems and thus the charging of the inside of the booth wall with the polarity of the electrostatic field is known per se from DE-AS 10 50 693, as is the covering of the wall one cabin formed of conductive material, for example with a thin layer of an insulating material such as paper. There is no conductive connection to the grounded cabin parts. Rather, it is particularly important to insulate, for example, a foil used for shielding well against earth potential, in order to prevent the applied charge from flowing away. It is also possible in this way to repel the spray material on the cabin walls, but due to the complete insulation against earth potential, there is a considerable risk of the build-up of electrical discharge energy, which remains even longer after the electrical field has been switched off.

Weitere Merkmale und Vorteile der Erfindung sind in den Unteransprüchen und der folgenden Beschreibung eines Ausführungsbeispieles der Erfindung erläutert. Es zeigen :

  • Figur 1 eine Seitenansicht zweier aneinandergeflanschter Pulver-Sprühkabinen
  • Figur 2 einen Schnitt durch diese Kabinengruppe längs der Linie II-II in Fig. 1
  • Figur 3 einen Schnitt nach der Linie 111-111 in Fig. 1
  • Figur 4 die Stelle IV aus Fig. 3
  • Figur 5 eine Ecke in Fig. 2
  • Figur 6 eine Ecke aus Fig. 3 und
  • Figur 7 eine Abwandlung der Ausführung Fig. 6. jeweils im Schnitt und in vergrößerster Darstellung.
Further features and advantages of the invention are explained in the subclaims and the following description of an embodiment of the invention. Show it :
  • Figure 1 is a side view of two powder spray booths flanged together
  • FIG. 2 shows a section through this cabin group along the line II-II in FIG. 1
  • 3 shows a section along the line 111-111 in Fig. 1st
  • FIG. 4 shows position IV from FIG. 3
  • FIG. 5 shows a corner in FIG. 2
  • Figure 6 shows a corner of Fig. 3 and
  • 7 shows a modification of the embodiment of FIG. 6, each in section and in an enlarged view.

In der Grenzebene 1 sind zwei im übrigen identische Pulversprühkabinen 2 und 3 um 180 zueinander verdreht aneinandergeflanscht. Sie weisen jeweils oberhalb eines Grundrahmens 4 zwei Seitenwände 5 mit einer Einsprühöffnung 6 und 7 mit einer Anschlußöffnung 8 für ein Rückgewinnungsaggregat 9 auf, das jeweils zwei hängend angeordnete Filterpatronen 11 besitzt. Diese sind ebenso wie der darüber angeordnete Ventilator an einem der beiden Deckenteile 12.13 aufgehängt. Zwischen diesen Deckenteilen wird ein Schlitz 14 für die Durchführung einer Transportbahn gebildet, an der Werkstücke hängend innerhalb der Transportöffnung 15 durch beide Kabinen 2 und 3 und die Anschlußschachte 16 transportiert werden können.In the boundary plane 1, two otherwise identical powder spray booths 2 and 3 are flanged to one another by 180 degrees. They each have a side frame 5 above a base frame 4 with an injection opening 6 and 7 with a connection opening 8 for a recovery unit 9, each two has hanging filter cartridges 11. These, like the fan arranged above, are suspended on one of the two ceiling parts 12.13. Between these ceiling parts, a slot 14 is formed for the implementation of a transport path, on which workpieces can be transported hanging through the cabins 2 and 3 and the connecting shafts 16 within the transport opening 15.

Wie am besten aus den Fig. 4 und 6 zu ersehen, sind die Kabinenwandungen durch einzelne metallische Profilplattenelemente 17 gebildet, die an ihren Rändern zweifach abgekantet, mit ihren Randteilen 18 aneinandergefügt und durch Schrauben 19 verbunden sind. Die so zusammengefügten Plattenelemente sind mit mehreren Erdanschlüssen 21 verbunden und bilden zusammen ein als Erdungskäfig wirkendes selbsttragendes Kabinengehäuse. Sie können allerdings auch an einem gesonderten Traggerüst befestigt sein.As can best be seen from FIGS. 4 and 6, the cabin walls are formed by individual metallic profile plate elements 17 which are folded twice at their edges, joined together with their edge parts 18 and connected by screws 19. The plate elements assembled in this way are connected to a plurality of earth connections 21 and together form a self-supporting cabin housing which acts as an earth cage. However, they can also be attached to a separate support structure.

Wie Fig. 4 erkennen läßt, bilden die seitlich aneinandergefügten Plattenelemente 17 eine gemeinsame und bis auf die durch Rundungen an den Anschlußstellen bedingten Ritze durchgehend ebene Innenplatte 22, auf der mittels einer Klebeschicht 23 aus isolierendem Klebstoff eine Beschichtung 24 aus Isolierstoff aufgebracht ist. Diese Beschichtung sollte wenigstens eine Dicke von 0,5 mm haben und kann aus einem geeignten Kunststoff wie PVC, Teflon, Polyäthylen oder Nylon bestehen. Die Gesamtbeschichtung kann nach Fig. 4 durch Folien 25 in Form einzelner Bahnen gebildet sein, die entweder mit ihren Rändern entlang einer Stoßstelle 26 dicht aneinander liegen, evtl. verklebt sind, oder die Ränder werden durch eine Stoß-Schweißnaht 27 verbunden.As can be seen in FIG. 4, the laterally joined plate elements 17 form a common inner plate 22, which is continuous except for the crack caused by rounding at the connection points, on which a coating 24 of insulating material is applied by means of an adhesive layer 23 made of insulating adhesive. This coating should have a thickness of at least 0.5 mm and can consist of a suitable plastic such as PVC, Teflon, polyethylene or nylon. The overall coating can be formed according to FIG. 4 by foils 25 in the form of individual webs, which either lie close together with their edges along a joint 26, possibly glued, or the edges are connected by a butt weld seam 27.

Bei dünnen Folien in der Größenordnung von 0,5 mm bis 0,7 mm kommen unter Umständen auch Überlappungsschweißungen in Betracht. aber dann muß wieder für eine Ausdünnung oder Abrundung an dem überstehenden Rand gesorgt werden. Bei dickeren Folien, etwa in der Größenordnung von 1 mm, sollte die Verbindung möglichst in der gleichen Ebene liegen.In the case of thin foils in the order of magnitude of 0.5 mm to 0.7 mm, overlap welding may also be considered. but then again thinning or rounding must be provided on the protruding edge. In the case of thicker foils, approximately on the order of 1 mm, the connection should preferably be in the same plane.

Dabei kann auch die Folie selbst Unebenheiten überdecken und in den Ecken abgerundet sein, wie dies Fig. 5 erkennen läßt. Dort ist die gleiche Folie 25 der Beschichtung einer gleichförmigen Rundung 28 der Ecke zwischen zwei Platten 171 und 172 entlanggeführt. Dies kann bei dickeren Folien ggf. ohne Abstützung erfolgen. Bei dünnen Folien sollten jedoch rückseitig gesonderte Formkörper wie eine Hohlkehlenleiste 29 zwischengefügt werden, und auch die Klebeschicht 23 ist auf der Rückseite der Folie über diese Rundung hinweggeführt.The film itself can also cover unevenness and be rounded in the corners, as can be seen in FIG. 5. There the same film 25 of the coating of a uniform curve 28 is guided along the corner between two plates 171 and 172. In the case of thicker foils, this can possibly be done without support. In the case of thin films, however, separate shaped bodies, such as a fillet strip 29, should be interposed on the back, and the adhesive layer 23 is also guided over this curve on the back of the film.

Sofern die Beschichtung aus härterem Werkstoff besteht oder größere Dicke hat. verwendet man einzelne ebene Platten 31. die in der gleichen Ebene in Stoßstellung 26 aneinanderliegen oder durch Schweißnähte 27 verbunden sind. In den Ecken können sie jedoch gemäß Fig. 6 mit der Stirnfläche 32 einer Platte aneinanderstoßen und durch eine Hohlkehlen-Schweißnaht 33 verbunden werden. Diese Schweißnaht kann ebenso wie die Schweißnaht 27 an ihrer freiliegenden Außenfläche überschliffen sein, um Unebenheiten zu glätten.If the coating is made of a harder material or has a greater thickness. one uses individual flat plates 31 which lie against one another in the same plane in the butt position 26 or are connected by weld seams 27. In the corners, however, they can meet with the end face 32 of a plate as shown in FIG. 6 and be connected by a fillet weld 33. This weld seam, like the weld seam 27, can be ground on its exposed outer surface in order to smooth unevenness.

Bei einer anderen Eckverbindung werden gemäß Fig. 7 Hohlkehlenleisten 34 eingesetzt. deren Enden 35 in der Dicke der Platten 31 auslaufen und mit diesen durch Schweißnähte 36 verbunden sind. Dies empfiehlt sich vor allem für dikkere Platten über 1,8 mm, insbesondere in der Großenordnung von 2.4 mm bis 3 mm.In another corner connection, fillet strips 34 are used as shown in FIG. 7. the ends 35 of which run out in the thickness of the plates 31 and are connected to them by welds 36. This is particularly recommended for thicker panels over 1.8 mm, especially in the order of 2.4 mm to 3 mm.

Je härter der Beschichtungswerkstoff ist und je größer die Schichtstärke, umso formsteifer ist die Beschichtung selbst. Sie kann unter Umständen über begrenzte Flächen ohne rückseitige Abstützung hinweggeführt werden und trägt auch zur Formbeständigkeit des ganzen Kabinengehäuses bei. Vor allem steigt die Ebenflächigkeit der Beschichtung mit ihrer Dicke und der Formbeständigkeit des verwendeten Werkstoffes. Je formsteifer die Kabinenwandung selbst ist. umso geringere Anforderungen werden an die Formbeständigkeit der Beschichtung gestellt.The harder the coating material and the greater the layer thickness, the more dimensionally stable the coating itself. Under certain circumstances, it can be guided over limited areas without rear support and also contributes to the dimensional stability of the entire cabin housing. Above all, the flatness of the coating increases with its thickness and the dimensional stability of the material used. The more rigid the cabin wall itself is. all the less stringent requirements are placed on the dimensional stability of the coating.

Mit der tatsächlichen Dicke der Beschichtung ändert sich bei gegebenem elektrischen Verhalten des Schichtwerkstoffes der Widerstand zwischen der freiliegenden Innenfläche 37 der Beschichtung und der Rückseite der Klebeschicht 23. Durch diesen Widerstand ist aber bestimmt, wie schnell die von der Innenfläche 37 aufgenommene Spannung zum Erdanschluß 21 abgeleitet wird bzw. bis zu welcher Spannung die Innenfläche 37 aufgeladen werden kann.With the actual thickness of the coating, the resistance between the exposed inner surface 37 of the coating and the back of the adhesive layer 23 changes for a given electrical behavior of the layer material. However, this resistance determines how quickly the voltage absorbed by the inner surface 37 is dissipated to the ground connection 21 is or to what voltage the inner surface 37 can be charged.

Es muß sorgfältig darauf geachtet werden, daß sich nicht aus dem Spannungspotential und der Restleitfähigkeit des Beschichtungswerkstoffes Energien aufbauen, die schlagartig entladen werden können. Wesentlich ist aber, daß beim Sprühvorgang die Innenfläche 37 wenigstens in begrenzter Weise die gleiche Polarität wie die versprühten Pulverteilchen annimmt. An der Innenfläche 37 baut sich dann eine Gegenstrahlung auf, die ein Rücksprühen, jedenfalls aber ein Abweisen aller mit der gleichen Polarität aufgeladenen Teilchen bzw. aller nicht am Werkstoff niedergeschlagenen Teilchen zur Folge hat. Die dadurch verhinderten Pulver-Ablagerungen an den Kabinenwänden tragen wiederum zur erleichterten und schnelleren Reinigungsmöglichkeit der Kabine bei. Wenn nämlich alle Kanten hinreichend abgerundet sind, kommt man unter Umständen selbst ohne Staubsauger aus und kann die ganze Wandung lediglich mit einem Schaber, Wischer oder dgl. reinigen. Dies aber kann eine Person in wenigen Minuten bewerkstelligen.Care must be taken to ensure that energies that can be discharged suddenly do not build up from the voltage potential and the residual conductivity of the coating material. It is essential, however, that the inner surface 37 assumes at least to a limited extent the same polarity as the sprayed powder particles during the spraying process. A counter-radiation then builds up on the inner surface 37, which results in a back-spraying, but in any case a rejection of all particles charged with the same polarity or all particles not deposited on the material. The powder deposits thus prevented on the cabin walls in turn contribute to the easier and faster cleaning possibility of the cabin. If all edges are sufficiently rounded, you can get by without a vacuum cleaner and the entire wall can only be cleaned with a scraper, wiper or the like. But this can be done by a person in a few minutes.

Claims (9)

1. Spray cabin (2. 3) for electrostatic powder coating systems. the supporting wall of said cabin being composed of individual, conductive. earthed panel members (17) possibly mounted on a supporting frame and being internally provided with a covering forming a smooth area of contact, characterised in that the covering is formed by individual, laminar layer bodies (25, 31) which are interconnected by smooth surfaces at their edges and are made from an electrically insulating material having a layer thickness of at least 0.5 mm.
2. Spray cabin according to claim 1, characterised in that the layer bodies (25, 31) are made from a plastics material selected, in particular, from the PVC, Teflon, polyethylene and nylon group.
3. Spray cabin according to claim 1 or 2, characterised in that at least relatively thick layer bodies (25. 31) are welded or adhered so as to abut one another.
4. Spray cabin according to claim 1. 2 or 3, characterised in that the layer bodies (25, 31) are bonded to the cabin wall (17, 22) by means of an electrically insulating adhesive layer (23).
5. Spray cabin according to one of claims 1 to 4, characterised in that the layer bodies (25) are formed by flexible films.
6. Spray cabin according to claim 5, characterised in that concave portions (28), which are covered by the film (25) and are formed, in particular, by moulded bodies (29), are provided in the corners of the supporting cabin wall (17, 22).
7. Spray cabin according to one of claims 1 to 4, characterised in that the layer bodies (25) are formed by panels (31) made from a largely stable material having a maximum thickness of 3 mm. more especially having a thickness of from 1.8 mm to 2.6 mm.
8. Spray cabin according to claim 7, characterised in that the panels (31) are welded in the cabin corners so as to abut one another at right angles by means of a flat-lap seam (33), more especially a smoothed-over seam.
9. Spray cabin according to claim 7, characterised in that the panels (31), abutting one another with their edges in the corners of the cabin, are attached to concavely shaped bars (34), more especially they are welded (36) thereto, said bars taperingoff so as to correspond with the thickness of the panels (31).
EP84103862A 1983-04-28 1984-04-07 Spray booth for electrostatic powder coating Expired EP0123967B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19833315426 DE3315426A1 (en) 1983-04-28 1983-04-28 SPRAY CABIN FOR ELECTROSTATIC POWDER COATING SYSTEMS
DE3315426 1983-04-28

Publications (2)

Publication Number Publication Date
EP0123967A1 EP0123967A1 (en) 1984-11-07
EP0123967B1 true EP0123967B1 (en) 1986-06-18

Family

ID=6197596

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84103862A Expired EP0123967B1 (en) 1983-04-28 1984-04-07 Spray booth for electrostatic powder coating

Country Status (3)

Country Link
EP (1) EP0123967B1 (en)
DE (2) DE3315426A1 (en)
WO (1) WO1984004260A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4134702A1 (en) * 1991-10-21 1993-04-22 Gema Volstatic Ag CAB FOR SPRAY COATING OBJECTS WITH POWDER

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH668008A5 (en) * 1985-04-30 1988-11-30 H U Ramseier Fa ELECTROSTATIC POWDER COATING SYSTEM.
EP0306390A1 (en) * 1987-08-18 1989-03-08 Jean-Louis Morer Method and apparatus for coating, not needing any cleaning
FR2619519B1 (en) * 1987-08-18 1991-03-15 Romain Louisette COATING PROCESS AND INSTALLATION NOT REQUIRING CLEANING
FR2620355B1 (en) * 1987-09-16 1990-01-12 Romain Louisette MOBILE ELEMENT FOR COATING INSTALLATION, PARTICULARLY BY PAINT
WO1989002787A1 (en) * 1987-09-30 1989-04-06 Stephen Mervyn Fox Demountable spray booth with arcuate walls
DE3919614A1 (en) * 1989-06-15 1990-12-20 Gema Ransburg Ag SYSTEM FOR ELECTROSTATIC SPRAY COATING WITH POWDER
HU209374B (en) * 1989-06-16 1994-05-30 Farb Tec Beschichtung Cabin for spray-coating objects carried out with dusty coating material
DE4223819A1 (en) * 1992-07-20 1994-01-27 Gema Volstatic Ag St Gallen Electrostatic powder coating cabin - has separate electrically insulating material inside walls, made from polystyrene in polyurethane base sandwiched between PVC layers
DE4242543A1 (en) * 1992-12-16 1994-06-23 Gema Volstatic Ag St Gallen Cabin for electrostatic spray coating with powder
NL9500266A (en) * 1995-02-14 1996-09-02 Balak Coatings N V Powder spray booth.
DE19712619C1 (en) * 1997-03-26 1999-01-07 Thomas Robert Metall Elektro Chamber or tunnel dryer and preheater for ceramic moldings
DE102005040774A1 (en) * 2005-08-29 2007-03-01 Eisenmann Maschinenbau Gmbh & Co. Kg Work piece surface e.g. motor vehicle body, pretreatment arrangement e.g. dipping pretreatment arrangement, has cabin with cabin units that are connected with sealing component or adhesive
DE202012010569U1 (en) * 2012-11-07 2013-01-15 Berliner Wartungs- und Kundendienst GmbH Housing or chamber for receiving filters, heat exchangers, humidifiers, evaporators, air conditioners, fans, blower and suction devices and lightweight wall for repairing such housing

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE508469A (en) * 1951-02-11
US3505769A (en) * 1965-03-29 1970-04-14 Chevron Res Corrosion-resistant storage tank and method of forming
FR2038730A5 (en) * 1969-03-27 1971-01-08 Rg Sa
DE7822478U1 (en) * 1978-07-24 1979-01-18 Schaad, Hans J., 4600 Dortmund Powder spray booth

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4134702A1 (en) * 1991-10-21 1993-04-22 Gema Volstatic Ag CAB FOR SPRAY COATING OBJECTS WITH POWDER

Also Published As

Publication number Publication date
DE3315426A1 (en) 1984-10-31
EP0123967A1 (en) 1984-11-07
DE3460241D1 (en) 1986-07-24
WO1984004260A1 (en) 1984-11-08

Similar Documents

Publication Publication Date Title
EP0123967B1 (en) Spray booth for electrostatic powder coating
EP0402604A2 (en) Device for electrostatic spray-coating with powder
DE3631270C2 (en)
EP2318149B1 (en) Device for separating paint overspray
EP2512690B1 (en) Process and apparatus for electrostatical precipitation of overspray
DE19711319C1 (en) Solar module for space satellite
EP0055686A1 (en) Device for the corona treatment of thermoplastic external faces of shaped bodies
DE4134702A1 (en) CAB FOR SPRAY COATING OBJECTS WITH POWDER
DE3721703A1 (en) METHOD AND DEVICE FOR LACQUERING WORKPIECES WITH ELECTRICALLY INSULATING SURFACE BY ELECTROSTATIC APPLICATION OR. SPRAY ORDER
DE2012518A1 (en) Method and device for precipitating particles of a powdery substance
DE2039876A1 (en) Method and apparatus for producing a layered structure
DE8312480U1 (en) SPRAY CABIN FOR ELECTROSTATIC POWDER COATING SYSTEMS
WO2013020641A1 (en) Device for precipitating overspray
EP0588003B1 (en) Spraying booth
DE2135968C2 (en) Method for repelling particles from a substrate and device for carrying out the method
DE2054242C3 (en) Device for the electrostatic surface treatment of workpieces
DE4223819A1 (en) Electrostatic powder coating cabin - has separate electrically insulating material inside walls, made from polystyrene in polyurethane base sandwiched between PVC layers
DE3408014A1 (en) Method for conveying dust-like or powder-like substances using a stream of air and device for implementing the method
DE4207308C2 (en) Method of manufacturing a sheet metal housing
EP0486886B1 (en) Sealing arrangement for joints between two elements essentially consisting of plastic
DE2036279C3 (en) Method for repelling particles from a substrate and device for carrying out the method
DE202008001317U1 (en) RF sealing element
DE10317919B4 (en) Apparatus and method for coating a substrate with a liquid or particulate coating material
DD265340A1 (en) METHOD OF APPLYING A COATING MATERIAL, ESPECIALLY IN POWDER FORM, TO A MOVING SURFACE, AND A DEVICE FOR CARRYING OUT SAID METHOD
DE2330769C3 (en) Electrode arrangement for generating constant electrical fields in an electric air conditioning system

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): CH DE FR GB IT LI

17P Request for examination filed

Effective date: 19841120

ITF It: translation for a ep patent filed

Owner name: INTERPATENT ST.TECN. BREV.

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): CH DE FR GB IT LI

REF Corresponds to:

Ref document number: 3460241

Country of ref document: DE

Date of ref document: 19860724

ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19920313

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 19920317

Year of fee payment: 9

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19920429

Year of fee payment: 9

ITTA It: last paid annual fee
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19920616

Year of fee payment: 9

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19930407

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Effective date: 19930430

Ref country code: CH

Effective date: 19930430

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19930407

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19931229

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19940101

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST