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EP0440679A1 - Filter for removing hydrophobic substances from electrophoretic enamel coatings - Google Patents

Filter for removing hydrophobic substances from electrophoretic enamel coatings

Info

Publication number
EP0440679A1
EP0440679A1 EP89911058A EP89911058A EP0440679A1 EP 0440679 A1 EP0440679 A1 EP 0440679A1 EP 89911058 A EP89911058 A EP 89911058A EP 89911058 A EP89911058 A EP 89911058A EP 0440679 A1 EP0440679 A1 EP 0440679A1
Authority
EP
European Patent Office
Prior art keywords
filter
nonwoven
adsorption
support
filter according
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.)
Ceased
Application number
EP89911058A
Other languages
German (de)
French (fr)
Inventor
Heinz Nabel
Thomas BRÜCKEN
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.)
BASF Farben und Fasern AG
Original Assignee
BASF Lacke und Farben 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 BASF Lacke und Farben AG filed Critical BASF Lacke und Farben AG
Publication of EP0440679A1 publication Critical patent/EP0440679A1/en
Ceased legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D13/00—Electrophoretic coating characterised by the process
    • C25D13/22—Servicing or operating apparatus or multistep processes
    • C25D13/24—Regeneration of process liquids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
    • B01D17/02—Separation of non-miscible liquids
    • B01D17/0202—Separation of non-miscible liquids by ab- or adsorption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
    • B01D17/08—Thickening liquid suspensions by filtration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
    • B01D29/13—Supported filter elements
    • B01D29/23—Supported filter elements arranged for outward flow filtration
    • B01D29/27—Filter bags
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D36/00—Filter circuits or combinations of filters with other separating devices

Definitions

  • the invention relates to a filter for removing hydrophobic substances according to the preamble of the main claim.
  • DE-Cl 36 17 995 discloses a process for removing silicone or polymeric fluorocarbon-containing impurities from aqueous emulsions or dispersions, it being proposed that the aqueous emulsion or dispersion be finely divided silicates sand, diatomaceous earth, Silica gel or quartz is filtered. The structure of such a filter! " Direction is not described in this reference.
  • a filter insert for a liquid filter which essentially consists of a liquid-permeable support tube, a filter cartridge being pushed onto this support tube.
  • This filter cartridge has a net-like cylindrical frame inside, which is surrounded by a fiber packing. With such an arrangement it is not possible that the electrolytic leaks and the like.
  • the invention has for its object to remove fats, oils, silicone and perfluorinated compounds as well as solids from electrolytic lacquers without having to fear production disruptions due to frequent clogging of the filter devices. • This object on which the invention is based is achieved by the teaching of the main claim.
  • a filter which, if necessary, can be combined with other systems, such as ultrafiltration, heat exchangers, etc.
  • a spiral module-shaped filter cloth body is used, in which an approximately 2 m large propylene film and the like. U. wound up in two layers and housed in a corresponding needle fi z bag.
  • the nonwoven web can be wound around a perforated support tube together with a coarse-mesh plastic network.
  • Filter modules or filter cartridges are only necessary once or twice a week.
  • Flake-shaped polypropylene fibers or glass fibers can be placed between the actual spiral filter cartridge and the filter bag in order to avoid blockage of the filter bag.
  • a filter is shown purely schematically, partially cut open, the adsorption fleece with its support grid being more clearly recognizable in a pulled-out representation.
  • a housing 1 of a filter is drawn, the outflow of this filter housing 1 being recognizable at 8.
  • the provided in the upper region Zuflu3 is not shown for reasons of clarity and the guided through the housing 1 medium flowing / St from the top in the longitudinal axis of the housing 1 downward and penetrates a housed in the housing 1 filter cartridge 7 transverse to the aforementioned longitudinal axis.
  • a support basket 2 is provided within the housing 1, which carries a filter bag 3 on its inside, which is designed as a needle felt filter or monofilament bag and has the task of retaining solid particles.
  • a support tube 4 provided with throughflow openings.
  • This filter cartridge 7 essentially consists of a support grid 6 and an adsorption fleece 5, it being possible for the adsorption fleece 5 to be formed from polypropylene fibers or glass fibers.
  • the adsorption fleece 5 can also be applied in two or more layers.
  • the support grid 6 consists of a coarse-meshed plastic network, preferably a fiber structure, which only has the task of mechanically supporting the adsorption fleece 5, but at the same time, since it lies in the direction of flow in front of the adsorption fleece 5, causes coarser impurities to be retained.
  • a space 9 is present between the spiral filter cartridge 7 and the inside of the filter bag 3.
  • This space 9 can additionally be filled with filter materials.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Filtering Materials (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)

Abstract

La présence de substance hydrophobes dans les revêtements électrophorétiques peut provoquer des perturbations de surface sous la forme de cratères dans la couche de revêtement électrophorétique cuite et/ou revernie. Pour éliminer ces substances hydrophobes du revêtement électrophorétique, on a prévu un filtre qui comporte essentiellement une cartouche de filtrage hélicoïdale (7) qui consiste en un non-tissé absorbant (5) auquel peut s'ajouter un filet de protection à grosses mailles en matière synthétique (6) qui le rend plus résistant.The presence of hydrophobic substance in the electrophoretic coatings can cause surface disturbances in the form of craters in the baked and / or re-coated electrophoretic coating layer. To remove these hydrophobic substances from the electrophoretic coating, a filter is provided which essentially comprises a helical filter cartridge (7) which consists of an absorbent nonwoven (5) to which can be added a protective mesh with large mesh of material. synthetic (6) which makes it more resistant.

Description

"Fil ter zur Entfernung von hydrophoben Substanzen aus El e trotauchl ac en" "Filter for the removal of hydrophobic substances from el e trotauchl ac en"
Die Erfindung bezieht sich auf ein Filter zur Ent¬ fernung von hydrophoben Substanzen gemäß dem Ober¬ begriff des Hauptanspruches.The invention relates to a filter for removing hydrophobic substances according to the preamble of the main claim.
Durch die Anwesenheit von hydrophoben Substanzen, deren Oberflächenspannung kleiner als 35 mN/m be¬ trägt, z. B. Tiefziehfette , Kohl enwasserstofföl e , Sil iconverbindungen, perfluorierte Verbindungen usw. in El ektrotauchl acken kann es zu Oberflächen- Störungen der zu behandelnden Werkstücke kommen, z. B. in Form von Kratern im eingebrannten und/oder überlackierten Elektrotauchlackfilm. Diese Probleme verursachenenden Substanzen können sowohl in der Lackphase dispergiert sein als auch auf der Lack- Oberfläche eines El ektrotauchl ackbeckens schwimmen. Es müssen also Vorkehrungen getroffen werden, um diese störenden Substanzen zu entfernen.Due to the presence of hydrophobic substances, the surface tension of which is less than 35 mN / m, e.g. B. deep-drawing greases, Kohl enhydstofföl e, silicone icon compounds, perfluorinated compounds, etc. in El ektrotauchl acken there may be surface defects in the workpieces to be treated, eg. B. in the form of craters in the baked and / or overcoated electrocoat film. Substances causing these problems can both be dispersed in the paint phase and float on the paint surface of an electro-dip pool. Precautions must therefore be taken to remove these interfering substances.
Bisher hat man versucht, durch offene und auch ge- schlossene Filtration über Glasfasern zumeist char¬ genweise, d.h. durch Umpumpen des Inhaltes des Elek* trotauchl ackbeckens. in einen Gegenbehäl ter und zu¬ rück, diese, Probleme verursachenden Stoffe zu ent¬ fernen. Hierbei tritt der Nachteil auf, daß nur ein geringer Durchfluß möglich ist und die eingesetzten Filter blockieren und zusätzliche Filtereinrich¬ tungen notwendig werden. Die bisher bekannten Ver¬ fahren sind arbeitsintensiv und bedeuten einen Pro¬ dukt! onsausfal 1. Aus der DE-Cl 36 17 995 ist ein Verfahren zur Ent¬ fernung Silicon- oder polymerer fluorkohlenstoffhal¬ tiger Verunreinigungen aus w ssrigen Emulsionen oder Dispersionen bekannt, wobei vorgeschlagen wird, daß die wässrige Emulsion oder Dispersion durch fein= verteilte Silikate Sand, Kieselgur, Kieselgel oder Quarz filtriert wird. Der Aufbau einer solchen Fil¬ tere!" nrichtung wird in dieser Literaturstelle nicht beschrieben.Up to now, attempts have been made, mostly by batches, by open and closed filtration over glass fibers, ie by pumping around the contents of the electric immersion tank. in a counter container and back to remove these problem-causing substances. The disadvantage here is that only a low flow is possible and the filters used block and additional filter devices become necessary. The previously known methods are labor-intensive and mean a product! failure 1. DE-Cl 36 17 995 discloses a process for removing silicone or polymeric fluorocarbon-containing impurities from aqueous emulsions or dispersions, it being proposed that the aqueous emulsion or dispersion be finely divided silicates sand, diatomaceous earth, Silica gel or quartz is filtered. The structure of such a filter! " Direction is not described in this reference.
Aus der gattungsbildenden DE-33 43 881 AI ist ein Filtereinsatz für einen Fl ssigke tsfilter bekannt, der im wesentlichen aus einem flüssigkeitsdurchl s¬ sigem Stützrohr besteht, wobei auf diesem Stützrohr eine Filterpatrone aufgeschoben ist. Diese Filter¬ patrone weist im Inneren einen netzartigen zylindri¬ schen Rahmen auf, der von einer Faserpackung umgeben ist. Durch eine solche Anordnung ist es nicht mög¬ lich, die in El ektrotauchl acken u. U. vorkommenden hydrophoben Substanzen und Feststoffe in einer pro¬ duktionstechnisch zufriedenstellenden Weise abzu¬ scheiden .From the generic DE-33 43 881 AI a filter insert for a liquid filter is known which essentially consists of a liquid-permeable support tube, a filter cartridge being pushed onto this support tube. This filter cartridge has a net-like cylindrical frame inside, which is surrounded by a fiber packing. With such an arrangement it is not possible that the electrolytic leaks and the like. U. Occurring hydrophobic substances and solids in a production technically satisfactory manner.
Der Erfindung liegt die Aufgabe zugrunde, Fette, öle, Sil icone und perfluorierte Verbindungen sowie Feststoffe aus El ek trotauchl acken zu entfernen, ohne daß dabei Produ tionsstörungen durch häufiges Zusetzen der Filtereinr chtungen befürchtet werden müssen . • Diese der Erfindung zugrundeliegende Aufgabe wird durch die Lehre des Hauptanspruches gelöst.The invention has for its object to remove fats, oils, silicone and perfluorinated compounds as well as solids from electrolytic lacquers without having to fear production disruptions due to frequent clogging of the filter devices. • This object on which the invention is based is achieved by the teaching of the main claim.
Vorteilhafte Ausgestaltungen sind in den Unteran- 5 Sprüchen erl utert.Advantageous configurations are explained in the subclaims.
Mit anderen Worten ausgedrückt, wird ein Filter vor¬ geschlagen, das ggf. mit weiteren Anlagen, wie Ul¬ trafil ration, Wärmetauscher usw. kombiniert werden 0 kann. Um den Lackdurchfluß nicht zu stark zu redu¬ zieren, wird ein spi ral modul förmiger Filtertuch¬ körper eingesetzt, in dem ein etwa 2 m großes Poly¬ propyl envl ies u. U. doppellagig aufgewickelt und in einem entsprechenden Nadel fi 1 zbeutel untergebracht s wird. Zwecks Verbesserung der mechanischen Stabili¬ tät des Polypropyl envl iesfi 1 tertuchkörpers kann die Vliesbahn zusammen mit einem grobmaschigen Kunst¬ stoffnetz um ein gelochtes Stützrohr aufgewickelt werden. Die Praxis hat gezeigt, daß Wechsel dieser 0In other words, a filter is proposed which, if necessary, can be combined with other systems, such as ultrafiltration, heat exchangers, etc. In order not to reduce the paint flow too much, a spiral module-shaped filter cloth body is used, in which an approximately 2 m large propylene film and the like. U. wound up in two layers and housed in a corresponding needle fi z bag. In order to improve the mechanical stability of the polypropylene fabric body, the nonwoven web can be wound around a perforated support tube together with a coarse-mesh plastic network. Practice has shown that changing this 0
55
00
5 Filtermodule oder Filterpatronen nur ein- bis zweimal pro Woche notwendig sind.5 Filter modules or filter cartridges are only necessary once or twice a week.
Flockenformige Polypropylenfasern oder auch Glasfasern kön- nen zwischen der eigentlichen Spiralfilterpatrone und dem Filterbeutel untergebracht werden, um eine Blockade des Filterbeutels zu vermeiden.Flake-shaped polypropylene fibers or glass fibers can be placed between the actual spiral filter cartridge and the filter bag in order to avoid blockage of the filter bag.
Ein Ausführungsbeispiel der Erfindung wird nachfolgend an- hand der Zeichnung erläutert.An embodiment of the invention is explained below with reference to the drawing.
In der Zeichnung ist rein schematisch teilweise aufge¬ schnitten ein Filter dargestellt, wobei in einer herausge¬ zogenen Darstellung das Adsorptionsvlies mit seinem Stütz- gitter deutlicher erkennbar ist.In the drawing, a filter is shown purely schematically, partially cut open, the adsorption fleece with its support grid being more clearly recognizable in a pulled-out representation.
In der Zeichnung ist ein Gehäuse 1 eines Filters gezeich¬ net, wobei bei 8 der Abfluß dieses Filtergehäuses 1 er¬ kennbar ist. Der im oberen Bereich vorgesehene Zuflu3 ist aus Übersichtlichkeitsgründen nicht dargestellt und das durch das Gehäuse 1 geführte Medium flie/St von oben in Längsachse des Gehäuses 1 nach unten und durchdringt dabei eine in dem Gehäuse 1 untergebrachte Filterpatrone 7 quer zu der vorbeschriebenen Längsachse.In the drawing, a housing 1 of a filter is drawn, the outflow of this filter housing 1 being recognizable at 8. The provided in the upper region Zuflu3 is not shown for reasons of clarity and the guided through the housing 1 medium flowing / St from the top in the longitudinal axis of the housing 1 downward and penetrates a housed in the housing 1 filter cartridge 7 transverse to the aforementioned longitudinal axis.
Innerhalb des Gehäuses 1 ist ein Stützkorb 2 vorgesehen, der auf seiner Innenseite einen Filterbeutel 3 trägt, der als Nadelfilzfilter- oder Monofilamentbeutel ausgebildet ist und die Aufgabe hat, Feststoffpartikelchen zurückzuhal- ten.A support basket 2 is provided within the housing 1, which carries a filter bag 3 on its inside, which is designed as a needle felt filter or monofilament bag and has the task of retaining solid particles.
Im Inneren des Gehäuses 1 ist weiterhin zentral ein mit DurchfluSöffnungen versehenes Stützrohr 4 vor- gesehen, um das eine Filterpatrone 7 angeordnet ist. Diese Filterpatrone 7 besteht im wesentlichen aus einem Stütz¬ gitter 6 und einem Adsorptionsvlies 5, wobei das Adsorpti¬ onsvlies 5 aus Polypropylenfasern oder Glasfasern gebildet sein kann. Hierbei kann, was aus der Zeichnung nicht zu er¬ kennen ist, das Adsorptionsvlies 5 auch doppel- oder mehr¬ lagig aufgebracht werden. Das Stützgitter 6 besteht aus einem grobmaschigen Kunststoffnetz, vorzugsweise Faserge¬ bilde, das lediglich die Aufgabe der mechanischen Stützung des Adsorptionsvlieses 5 hat, dabei aber gleichzeitig, da es in Strömungsrichtung vor dem Adsorptionsvlies 5 liegt, ein Zurückhalten von gröberen Verunreinigungen bewirkt.In the interior of the housing 1 there is furthermore a support tube 4 provided with throughflow openings. seen around which a filter cartridge 7 is arranged. This filter cartridge 7 essentially consists of a support grid 6 and an adsorption fleece 5, it being possible for the adsorption fleece 5 to be formed from polypropylene fibers or glass fibers. Here, what cannot be seen from the drawing, the adsorption fleece 5 can also be applied in two or more layers. The support grid 6 consists of a coarse-meshed plastic network, preferably a fiber structure, which only has the task of mechanically supporting the adsorption fleece 5, but at the same time, since it lies in the direction of flow in front of the adsorption fleece 5, causes coarser impurities to be retained.
Wie aus der Zeichnung erkennbar, ist zwischen der Spiral- filterpatrone 7 und der Innenseite des Filterbeutels 3 ein Raum 9 vorhanden. Dieser Raum 9 kann zusätzlich mit Filter¬ werkstoffen ausgefüllt sein.As can be seen from the drawing, a space 9 is present between the spiral filter cartridge 7 and the inside of the filter bag 3. This space 9 can additionally be filled with filter materials.
Durch den Einsatz des vorbeschriebenen Filters und den Ein- satz der in Verbindung mit dem Filter angewandten Stoffe, wird ein sicheres Entfernen von Fetten, ölen, Siliconen und/oder perfluorierten Verbindungen sowie Feststoffen aus Elektrotauchlacken erreicht, so da,9 Oberflächenstörungen in Form von Kratern im eingebrannten oder überlackierten Elek- trotauchlackfilm nicht mehr auftreten können. The use of the filter described above and the materials used in connection with the filter ensure that greases, oils, silicones and / or perfluorinated compounds and solids are reliably removed from electrocoat materials, so there are 9 surface defects in the form of craters can no longer occur in the baked or overpainted electrocoat film.

Claims

Patentansprüche Claims
Filter mit einer in einem Filtergehäuse (1) angeordneten Filterpatrone (7), die aus einem Stützrohr (4) besteht, auf dessen Außenseit eine ein Stützgitter (6) aufweisen¬ de Faserpackung angeordnet ist und die Haupt¬ durchflußrichtung in Längsachse des Gehäuses (1) ausgerichtet ist, aber die Flüssigkeit die Filterpatrone (7) im wesentlichen quer zur Längsachse durchströmt, dadurch gekenn¬ zeichnet, daß zur Entfernung von hydrophoben Substanzen aus El ektrotauchl acken , a) die Faserpackung als Adsorptionsvliesbahn (5) ausgebildet ist, b) das Stützgitter (6) aus einem grob¬ maschigen Kunststoffnetz besteht, c) die Adsorptionsvliesbahn (5) in Strömungs- richtung gesehen auf der Rückseite des Stützgitters (6) angeordnet ist, d) das Stützgitter (6) und. die Adsorptions¬ vliesbahn (5) spiralför ig um das Stütz- röhr (4) aufgewickelt sind, e) die Durchströmungsrichtung vom Inneren des Stützrohres (6) nach außen gerichtet ist, f) innerhalb des Gehäuses (1) die Filter¬ patrone (7) im Abstand umgebend ein Stütz- korb (2) mit einem Filterbeutel (3) fürFilter with a filter cartridge (7) arranged in a filter housing (1), which consists of a support tube (4), on the outside of which a fiber packing having a support grid (6) is arranged and the main flow direction in the longitudinal axis of the housing (1 ) is aligned, but the liquid flows through the filter cartridge (7) essentially transversely to the longitudinal axis, characterized gekenn¬ characterized in that to remove hydrophobic substances from Electro dip, a) the fiber pack is designed as a nonwoven adsorption web (5), b) that Support grid (6) consists of a coarse-mesh plastic network, c) the nonwoven adsorption web (5) in flow seen direction is arranged on the back of the support grid (6), d) the support grid (6) and. the nonwoven adsorption web (5) is wound spirally around the support tube (4), e) the flow direction is directed outwards from the inside of the support tube (6), f) the filter cartridge (7) inside the housing (1) ) surrounding a support basket (2) with a filter bag (3) for
Feststoffparti kel angeordnet ist, wobei der Filterbeutel (3) in Durchflußrichtung des Filters gesehen auf der Innenseite des Stützkorbes (3) angeordnet ist.Solid particle is arranged, wherein the filter bag (3) seen in the flow direction of the filter is arranged on the inside of the support basket (3).
2. Filter nach Anspruch 1, dadurch gekennzeich¬ net, daß der Filterbeutel (3) als Nadelfilz¬ beutel ausgebildet ist.2. Filter according to claim 1, characterized gekennzeich¬ net that the filter bag (3) is designed as a needle felt bag.
3. Filter nach Anspruch 1, dadurch gekennzeichnet . daß der Filterbeutel (3) als Monof i 1 ament- Kunststoffnetz ausgebildet ist.3. Filter according to claim 1, characterized. that the filter bag (3) is designed as a Monof i 1 ament plastic network.
4. Filter nach Anspruch 1, 2 oder 3, dadurch ge- kennzeichnet, daß das Stützgitter (6) aus einer grobmaschigen Fasermatte besteht.4. Filter according to claim 1, 2 or 3, characterized in that the support grid (6) consists of a coarse-mesh fiber mat.
5. Filter nach einem oder mehreren der vorher¬ gehenden Ansprüche, dadurch gekennzeich- net, daß zwischen der Außenseite der Filter¬ patrone (7) und der Innenseite des Filter¬ beutels (3) flockenformige Polypropylenfasern eingefüllt sind.5. Filter according to one or more of the preceding claims, characterized in that flake-like polypropylene fibers are filled in between the outside of the filter cartridge (7) and the inside of the filter bag (3).
6. Filter nach einem oder mehreren der vorher- gehenden Ansprüche, dadurch gekennzeichnet, daß die Adsorptionsvliesbahn (5) durch ein Polypropylenvlies gebildet ist.6. Filter according to one or more of the previously going claims, characterized in that the adsorption nonwoven web (5) is formed by a polypropylene nonwoven.
Filter nach einem oder mehreren der vorher¬ gehenden Ansprüche 1 bis 5, dadurch gekenn¬ zeichnet, daß die Adsorptionsvliesbahn (5) durch ein Glasfaservlies gebildet ist.Filter according to one or more of the preceding claims 1 to 5, characterized gekenn¬ characterized in that the nonwoven adsorption web (5) is formed by a glass fiber fleece.
10 Filter nach einem oder mehreren der vorher¬ gehenden Ansprüche, dadurch gekennzeichnet, daß die Adsorptionsvl esbahn (5) ein- oder mehrlagig auf dem Stützgitter (6) angeordnet st. 10 Filter according to one or more of the preceding claims, characterized in that the adsorption membrane (5) is arranged in one or more layers on the support grid (6).
EP89911058A 1988-10-31 1989-09-30 Filter for removing hydrophobic substances from electrophoretic enamel coatings Ceased EP0440679A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3836973 1988-10-31
DE3836973A DE3836973A1 (en) 1988-10-31 1988-10-31 FILTERS FOR THE REMOVAL OF HYDROPHOBIC SUBSTANCES FROM ELECTRO Dipped Coatings

Publications (1)

Publication Number Publication Date
EP0440679A1 true EP0440679A1 (en) 1991-08-14

Family

ID=6366211

Family Applications (2)

Application Number Title Priority Date Filing Date
EP89118204A Pending EP0366947A1 (en) 1988-10-31 1989-09-30 Filter for removing hydrophobic substances from electrodeposition paints
EP89911058A Ceased EP0440679A1 (en) 1988-10-31 1989-09-30 Filter for removing hydrophobic substances from electrophoretic enamel coatings

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP89118204A Pending EP0366947A1 (en) 1988-10-31 1989-09-30 Filter for removing hydrophobic substances from electrodeposition paints

Country Status (4)

Country Link
EP (2) EP0366947A1 (en)
BR (1) BR8907748A (en)
DE (1) DE3836973A1 (en)
WO (1) WO1990005012A1 (en)

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* Cited by examiner, † Cited by third party
Title
See references of WO9005012A1 *

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DE3836973A1 (en) 1990-05-03
BR8907748A (en) 1991-08-27
EP0366947A1 (en) 1990-05-09
DE3836973C2 (en) 1990-12-06
WO1990005012A1 (en) 1990-05-17

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