EP1982625B1 - Filter bag for a vacuum cleaner - Google Patents

Filter bag for a vacuum cleaner Download PDF

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Publication number
EP1982625B1
EP1982625B1 EP08101938.2A EP08101938A EP1982625B1 EP 1982625 B1 EP1982625 B1 EP 1982625B1 EP 08101938 A EP08101938 A EP 08101938A EP 1982625 B1 EP1982625 B1 EP 1982625B1
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EP
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Prior art keywords
filter
filter bag
filter material
bag according
bag
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EP08101938.2A
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German (de)
French (fr)
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EP1982625A3 (en
EP1982625A2 (en
Inventor
Wolfgang Dr. Czado
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Wolf PVG GmbH and Co KG
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Wolf PVG GmbH and Co KG
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    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
    • A47L9/10—Filters; Dust separators; Dust removal; Automatic exchange of filters
    • A47L9/14—Bags or the like; Rigid filtering receptacles; Attachment of, or closures for, bags or receptacles

Definitions

  • the present invention relates to a filter bag for a vacuum cleaner, with an inflow, can flow through the air to be cleaned in the filter bag to then flow through the filter material of the filter bag and thereby to be cleaned, wherein the filter material comprises at least one layer of nonwoven fabric.
  • the DE 201 01 466 discloses a filter bag for vacuum cleaner, which is formed from a nonwoven material which is welded to form a bag edge with each other. At a position of the nonwoven material, an inflow opening is formed, which is surrounded by a holding plate to fix the filter bag to a vacuum cleaner.
  • Such filter bags have a high filter performance, in particular, even very small dust particles can be filtered out by the appropriate choice of the nonwoven material. In the course of using the filter bag clogged this more and more, so that the filter performance and the passing through the filter bag flow decreases. This decrease in the volume flow also reduces the filter performance.
  • the DE 201 10 838 discloses a dust bag for a vacuum cleaner in which an air-permeable intermediate layer is provided between two layers of material.
  • the material layers can be characterized by calendering.
  • the filter bag is formed by a filter material that is embossed at least in regions, wherein the effective filter surface is enlarged by a profiling of the filter material.
  • a profiling gives the filter bag a three-dimensional shape, which has a larger surface area than the flat filter material used in the conventional filter bags.
  • the profiling of the filter material increases the effective filter area by more than 10%, preferably by more than 20% or 30%, compared with a flat, smooth design of the filter material. Because depending on the design of the profiling, the effective filter surface can be increased.
  • the profiling includes protrusions protruding from the plane of the filter material.
  • hemispheres are also possible to provide a profiling that differs from a flat smooth shape of the filter material.
  • the profiling preferably projects from the plane of the filter material by at least 1 to 2 mm, in particular by more than 3 mm.
  • the profiles are formed as spherical segments with a diameter of 4 mm to 40 mm, preferably 6 mm to 20 mm. The pitch for such profiles may then be in a range between 1 cm and 3 cm to provide a regular surface texture.
  • the filter bag on two layers of filter material which are welded together at the edges and at least one layer of filter material is embossed over the entire surface.
  • the filter material is multi-layered and has a pre-filter, a grobstaub precede and a fine filter.
  • the filter material to the downstream side have an increasing fiber density, so that even very small particles can be filtered on the downstream side.
  • the filter material may have a layer of ultrafine fibers, preferably with a fiber diameter between 10 nm and 1000 nm, in particular 100 nm to 500 nm.
  • the profilings on the filter material can be introduced, for example, by hot calendering into the nonwoven material, so that a permanent deformation of the filter material is achieved by the action of pressure and temperature.
  • a filter bag 1 comprises two layers 2 of a filter material, in particular a multi-layer nonwoven fabric, which are welded together peripherally at one edge 3. As a result, the filter bag 1 has a closed interior, which is accessible only via an inflow opening 5.
  • the inflow opening 5 is surrounded by a holding plate 4 made of plastic, which serves to fix the filter bag 1 in a chamber of a vacuum cleaner.
  • a closure plate for closing the inflow opening 5 may be provided.
  • the geometry of the filter bag 1 can also be designed differently instead of the quadratic design shown, for example, folded side edges or other geometries can be used.
  • At least one layer 2 of the filter bag 1 is formed embossed and comprises at regular intervals elevations 6, which are connected to one another via planar sections 7, as in FIG. 2 is shown.
  • the height h of the projections 6 may be formed in a range between 2 mm to 5 mm in order to increase the effective filter area.
  • the elevations 6 protrude from the flat sections 7, wherein the flat sections 7 form a flat filter surface, and this is the case in the filter bags according to the prior art over the entire surface.
  • the effective filter area is significantly increased.
  • the layer of filter material 2 can also store more dust, since the dust is distributed over a comparatively larger area and only to a lesser extent does a blockage take place.
  • the profiles 6 are formed in the illustrated embodiment as hemispheres, which are arranged at a grid spacing of 1.5 cm and have a diameter of 1 cm.
  • hemispheres which are arranged at a grid spacing of 1.5 cm and have a diameter of 1 cm.
  • embossing we use a pair of heated rollers, which, depending on the material, such as polypropylene, PES, polyamide or other materials, are brought to temperatures between 80 ° and 240 ° and between which the filter material under contact pressures from 0.1 bar to 50 bar is performed.
  • a roll is usually provided with an engraving, whereas the counter roll is designed as a smooth roll. If three-dimensional geometries are embossed, the mating roll can also have a corresponding negative mold of the embossing roll. Profiles 6 in the form of boxes, diamonds, triangles, lines and serpentine lines can be embossed by the roller pair in order to enlarge the effective filter surface.
  • the filter medium can be compressed by a particularly strong compression, as a result, the pore diameter are reduced and increased the filter efficiency, especially against small particles.
  • embossing it is also possible to provide special shapes during embossing in order to achieve optical effects or to ensure a certain functionality. It is also possible not to emboss the entire bag surface but only a certain area, e.g. mechanically reinforce the area opposite the inlet opening by embossing, since this area is usually mechanically stressed particularly by impinging particles. The area opposite the inflow opening 5 can therefore be solidified by embossing, that is, have a smaller layer thickness than the surrounding area.
  • the filter material 2 of the filter bag 1 is preferably a combination of different layers, wherein a Vorfiltervlies, a Grobstaub precede and a fine filter and a stabilizing layer can be used.
  • the pre-filter coarse dirt greater than 1 mm back has an air permeability of more than 1000 1 / sqm xs, a thickness of less than 0.5 mm and a basis weight between 15 to 100 g / sqm.
  • the prefilter is preferably made of a spunbonded nonwoven, also called spunbond, a scrim or a perforated or slit film.
  • the coarse dust accumulator stores coarse dirt of less than 1 mm, has an air permeability of more than 1000 l / m2 xs, a thickness of 0.5 mm to 5 mm, preferably about 1 mm to 2 mm and a basis weight between 20 to 100 g / sqm on.
  • the coarse dust storage preferably consists of a dry or wet-laid nonwoven which may be solidified by needling or jetting, by adhesive powder or bicomponent fibers or other conventional consolidation processes.
  • the coarse dust accumulator may have a fiber gradient both in terms of the fiber diameter (increasing fiber diameter towards the upstream side) and the fiber density (increasing fiber density towards the downstream side).
  • the gradient can also be formed by a plurality of successive nonwoven layers having just mentioned properties. Also suitable is an open-cell foam.
  • the fine filter retains fine dirt larger than 0.0001 mm, and has an air permeability of more than 2001 / sqm x s, a thickness of less than 0.5 mm and a basis weight between 15 - 80 g / sqm.
  • the fine filter preferably consists of a spunbonded nonwoven fabric, a meltblown or a spunbonded meltblown combination such as SM, SMS, SMMS, SMSMS, etc.
  • the stabilizing layer has an air permeability of more than 500 l / qm xs, a thickness of less than 1 mm and a basis weight between 15 - 100 g / qm and preferably consists of a spunbonded nonwoven fabric, a scrim, or a perforated or slit film.
  • an additional ultrafine filter layer in the form of a layer of nanofibers with a fiber diameter of 10-2000 nm.
  • the nanofiber layer retains fine dirt and has an air permeability of more than 200 l / m2 x s, a thickness of less than 0.1 mm and a basis weight between 0.01 - 2 g / sqm.
  • the nanofiber layer is directly on the fine filter layer, e.g. filed a meltdown.
  • both a layer of nanofibers on the downstream side is conceivable, as well as a layer on the upstream side, as well as to increase the filter performance both on the inlet and outflow side.
  • nanofiber layer in particular spunbond
  • FIG. 3 a table is shown for the volume flow drop of different filter bags. Three bags with an area of 26 cm x 28 cm were tested, whereby the drop in the volume flow was measured when loading the bag with DMT type 8 dust.
  • the bag A consists of a five-ply air filter medium of 20 gsm spunbond, 45 gsm fleece, 20 gsm spunbond, 25 gsm meltblown, 30 gsm spunbond, in which a 1.5 cm grid of hemispheres are imprinted with a radius of 0.5 cm.
  • the filter performance with an emission of 0.3 mg / m 3 fine dust compared to the standard non-woven bag with 0.35 mg / m 3 is slightly improved.
  • the bag B consists of a six-layered air filter medium of 20 gsm spunbond, 45 gsm nonwoven, 20 gsm spunbond with an overlay of 0.2 gsm nanofibers, 25 gsm meltblown and 30 gsm spunbond are imprinted in a grid spacing of 1.5 cm hemispheres with a radius of 0.5 cm.
  • the additional nanofiber fine filter layer significantly improves the filter performance with an emission of 0.19 mg / m3 fine dust compared to the standard nonwoven bag with 0.35 mg / m3.
  • the bag C is a standard fleece bag made of a five-ply air filter medium of 20 gsm spunbond, 45 gsm fleece, 20 gsm spunbond, 25 gsm meltblown and 30 gsm spunbond which is unembossed and one smooth surface.
  • a filter bag has profiles in the form of elongated ribs arranged parallel to one another.
  • the distance between two adjacent ribs is preferably less than 1 cm, so that a corrugated structure is obtained.
  • the height of the ribs is between 2 to 7 mm.
  • the distance between the filter bag and the respective wall to the dust chamber can be ensured even without these spacer ribs. This results in a better suction performance, because the distance between the outer wall of the filter bag and the wall of the dust chamber allows better air flow.
  • the design of the dust chamber can be simplified by omitting the spacer ribs, which allows material savings in the production of the dust chamber.
  • the distance between the profiles can be 0.5 to 1.5 cm, while the height of the profilings is about 2-5 mm, preferably 3-4 mm.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Filtering Materials (AREA)
  • Filters For Electric Vacuum Cleaners (AREA)

Description

Die vorliegende Erfindung betrifft einen Filterbeutel für einen Staubsauger, mit einer Einströmöffnung, durch die zu reinigende Luft in den Filterbeutel einströmen kann, um dann durch das Filtermaterial des Filterbeutels zu strömen und dabei gereinigt zu werden, wobei das Filtermaterial mindestens eine Lage Vliesstoff umfasst.The present invention relates to a filter bag for a vacuum cleaner, with an inflow, can flow through the air to be cleaned in the filter bag to then flow through the filter material of the filter bag and thereby to be cleaned, wherein the filter material comprises at least one layer of nonwoven fabric.

Die DE 201 01 466 offenbart einen Filterbeutel für Staubsauger, der aus einem Vliesstoffmaterial gebildet ist, das zur Bildung eines Beutels randseitig mit einander verschweißt ist. An einer Lage des Vliesstoffmaterials ist eine Einströmöffnung ausgebildet, die von einer Halteplatte umgeben ist, um den Filterbeutel an einem Staubsauger festzulegen. Solche Filterbeutel weisen eine hohe Filterleistung auf, insbesondere können auch sehr kleine Staubpartikel durch die entsprechende Wahl des Vliesstoffmaterials herausgefiltert werden. Im Laufe der Benutzung des Filterbeutels verstopft dieser mehr und mehr, so dass die Filterleistung und der durch den Filterbeutel hindurchtretende Volumenstrom absinkt. Dieses Absinken des Volumenstromes senkt auch die Filterleistung.The DE 201 01 466 discloses a filter bag for vacuum cleaner, which is formed from a nonwoven material which is welded to form a bag edge with each other. At a position of the nonwoven material, an inflow opening is formed, which is surrounded by a holding plate to fix the filter bag to a vacuum cleaner. Such filter bags have a high filter performance, in particular, even very small dust particles can be filtered out by the appropriate choice of the nonwoven material. In the course of using the filter bag clogged this more and more, so that the filter performance and the passing through the filter bag flow decreases. This decrease in the volume flow also reduces the filter performance.

Die DE 201 10 838 offenbart eine Staubbeutel für einen Staubsauger, bei dem zwischen zwei Materiallagen eine luftdurchlässige Zwischenlage vorgesehen ist. Die Materiallagen können dabei durch Kalandrieren geprägt sein.The DE 201 10 838 discloses a dust bag for a vacuum cleaner in which an air-permeable intermediate layer is provided between two layers of material. The material layers can be characterized by calendering.

Es ist daher Aufgabe der vorliegenden Erfindung einen Filterbeutel für einen Staubsauger zu schaffen, der bei möglichst guten Filterleistungen ein Absinken des Volumenstromes auch bei zunehmender Beladung so gering wie möglich ausfallen lässt.It is therefore an object of the present invention to provide a filter bag for a vacuum cleaner, which can be as low as possible with the best possible filter performance, a decrease in the flow rate even with increasing load.

Diese Aufgabe wird mit einem Filterbeutel mit den Merkmalen des Anspruches 1 gelöst.This object is achieved with a filter bag having the features of claim 1.

Erfindungsgemäß ist der Filterbeutel durch ein Filtermaterial gebildet, dass zumindest bereichsweise verprägt ist, wobei durch eine Profilierung des Filtermaterials die wirksame Filterfläche vergrößert ist. Dadurch kann bei einer vorgegebenen Geometrie eines Filterbeutels die Filterleistung verbessert werden. Eine solche Profilierung gibt dem Filterbeutel eine dreidimensionale Gestalt, die eine größere Oberfläche besitzt als das ebene Filtermaterial, das bei den gebräuchlichen Filterbeuteln eingesetzt wird.According to the invention, the filter bag is formed by a filter material that is embossed at least in regions, wherein the effective filter surface is enlarged by a profiling of the filter material. As a result, the filter performance can be improved for a given geometry of a filter bag. Such a profiling gives the filter bag a three-dimensional shape, which has a larger surface area than the flat filter material used in the conventional filter bags.

Gemäß einer bevorzugten Ausgestaltung der Erfindung ist durch die Profilierung des Filtermaterials die wirksame Filterfläche gegenüber einer ebenen glatten Gestaltung des Filtermaterials um mehr als 10 %, vorzugsweise um mehr als 20 % oder 30 % erhöht. Denn je nach Gestaltung der Profilierung kann die wirksame Filteroberfläche vergrößert werden.According to a preferred embodiment of the invention, the profiling of the filter material increases the effective filter area by more than 10%, preferably by more than 20% or 30%, compared with a flat, smooth design of the filter material. Because depending on the design of the profiling, the effective filter surface can be increased.

Die Profilierung umfasst Erhebungen, die von der Ebene des Filtermaterials hervorstehen. Zudem sind natürlich auch Halbkugeln möglich, um eine Profilierung bereitzustellen, die von einer ebenen glatten Gestalt des Filtermaterials abweicht. Die Profilierung steht von der Ebene des Filtermaterials vorzugsweise um mindestens 1 bis 2 mm, insbesondere um mehr als 3 mm hervor. Dadurch lässt sich auf einfache Weise eine erhebliche Vergrößerung der wirksamen Filteroberfläche erreichen. Die Profilierungen sind als Kugelsegmente mit einem Durchmesser von 4 mm bis 40 mm, vorzugsweise 6 mm bis 20 mm ausgebildet. Das Rastermaß für solche Profilierungen kann dann in einem Bereich zwischen 1 cm und 3 cm liegen, um eine regelmäßige Oberflächenstruktur bereitzustellen.The profiling includes protrusions protruding from the plane of the filter material. In addition, of course, hemispheres are also possible to provide a profiling that differs from a flat smooth shape of the filter material. The profiling preferably projects from the plane of the filter material by at least 1 to 2 mm, in particular by more than 3 mm. As a result, a significant increase in the effective filter surface can be achieved in a simple manner. The profiles are formed as spherical segments with a diameter of 4 mm to 40 mm, preferably 6 mm to 20 mm. The pitch for such profiles may then be in a range between 1 cm and 3 cm to provide a regular surface texture.

Gemäß einer weiteren Ausgestaltung der Erfindung weist der Filterbeutel zwei Lagen aus Filtermaterial auf, die randseitig miteinander verschweißt sind und mindestens eine Lage Filtermaterial ist vollflächig verprägt. Durch die Erhöhung der wirksamen Filteroberfläche an zumindest einer Lage Filtermaterial ist es möglich, die zweite Lage Filtermaterial kostengünstig herzustellen, beispielsweise durch eine Kunststofffolie, so dass die Gesamtkosten des Filterbeutels reduziert werden. Denn durch die Vergrößerung der wirksamen Filteroberfläche kann bei selber Filterleistung ein Teil der Filterfläche kostengünstig durch eine Folie oder ein einfaches Vliesstoffmaterial gebildet sein.According to a further embodiment of the invention, the filter bag on two layers of filter material, which are welded together at the edges and at least one layer of filter material is embossed over the entire surface. By increasing the effective filter surface on at least one layer of filter material, it is possible to inexpensively produce the second layer of filter material, for example by a plastic film, so that the total cost of the filter bag can be reduced. Because by enlarging the effective filter surface part of the filter surface can be inexpensively formed by a film or a simple nonwoven material at even filter performance.

Für eine gute Filterleistung ist das Filtermaterial mehrlagig aufgebaut und weist einen Vorfilter, einen Grobstaubspeicher und einen Feinfilter auf. Dabei kann das Filtermaterial zur Abströmseite eine zunehmende Faserdichte aufweisen, so dass an der Abströmseite auch sehr kleine Partikel gefiltert werden können. Für eine besonders feine Abscheidung von Staubpartikeln kann das Filtermaterial eine Schicht aus Feinstfasern, vorzugsweise mit einem Faserdurchmesser zwischen 10 nm und 1000 nm, insbesondere 100 nm bis 500 nm aufweisen.For a good filter performance, the filter material is multi-layered and has a pre-filter, a grobstaubspeicher and a fine filter. In this case, the filter material to the downstream side have an increasing fiber density, so that even very small particles can be filtered on the downstream side. For a particularly fine separation of dust particles, the filter material may have a layer of ultrafine fibers, preferably with a fiber diameter between 10 nm and 1000 nm, in particular 100 nm to 500 nm.

Die Profilierungen an dem Filtermaterial können beispielsweise durch Heißkalandrierung in das Vliesstoffmaterial eingebracht sein, so dass durch Einwirkung von Druck und Temperatur eine dauerhafte Verformung des Filtermaterials erreicht wird.The profilings on the filter material can be introduced, for example, by hot calendering into the nonwoven material, so that a permanent deformation of the filter material is achieved by the action of pressure and temperature.

Die Erfindung wird nachfolgend anhand eines Ausführungsbeispieles mit Bezug auf die beigefügten Zeichnungen näher erläutert. Es zeigen:

Figur 1
eine Draufsicht auf einen erfindungsgemäßen Filterbeutel;
Figur 2
eine geschnittene Ansicht durch das geprägte Filtermaterial des Filterbeutels der Figur 1, und
Figur 3
eine Graphik zum Volumenstromabfall bei zunehmender Beladung von Filterbeuteln.
The invention will be explained in more detail using an exemplary embodiment with reference to the accompanying drawings. Show it:
FIG. 1
a plan view of a filter bag according to the invention;
FIG. 2
a sectional view through the embossed filter material of the filter bag the FIG. 1 , and
FIG. 3
a graphic of the volume flow drop with increasing loading of filter bags.

Ein Filterbeutel 1 umfasst zwei Lagen 2 aus einem Filtermaterial, insbesondere einem mehrlagigen Vliesstoff, die an einem Rand 3 umlaufend miteinander verschweißt sind. Dadurch besitzt der Filterbeutel 1 einen geschlossenen Innenraum, der nur über eine Einströmöffnung 5 zugänglich ist. Die Einströmöffnung 5 ist von einer Halteplatte 4 aus Kunststoff umgeben, die zur Festlegung des Filterbeutels 1 in einer Kammer eines Staubsaugers dient. Zudem kann auch eine Verschlussplatte zum Verschließen der Einströmöffnung 5 vorgesehen sein. Die Geometrie des Filterbeutels 1 kann statt der gezeigten quadratischen Ausbildung auch anders ausgestaltet sein, beispielsweise können eingefaltete Seitenkanten oder andere Geometrien verwendet werden.A filter bag 1 comprises two layers 2 of a filter material, in particular a multi-layer nonwoven fabric, which are welded together peripherally at one edge 3. As a result, the filter bag 1 has a closed interior, which is accessible only via an inflow opening 5. The inflow opening 5 is surrounded by a holding plate 4 made of plastic, which serves to fix the filter bag 1 in a chamber of a vacuum cleaner. In addition, a closure plate for closing the inflow opening 5 may be provided. The geometry of the filter bag 1 can also be designed differently instead of the quadratic design shown, for example, folded side edges or other geometries can be used.

Zumindest eine Lage 2 des Filterbeutels 1 ist geprägt ausgebildet und umfasst in regelmäßigen Abständen Erhebungen 6, die über ebene Abschnitte 7 miteinander verbunden sind, wie dies in Figur 2 dargestellt ist. Die Höhe h der Erhebungen 6 kann in einem Bereich zwischen 2 mm bis 5 mm ausgebildet sein, um die wirksame Filterfläche zu vergrößern. Die Erhebungen 6 stehen von den ebenen Abschnitten 7 hervor, wobei die ebenen Abschnitte 7 eine ebene Filterfläche ausbilden, sowie dies bei den Filterbeuteln nach dem Stand der Technik vollflächig der Fall ist. Durch das Einprägen der Profilierungen 6 wird jedoch die wirksame Filterfläche deutlich vergrößert. Dadurch kann die Lage aus Filtermaterial 2 auch mehr Staub speichern, da der Staub auf einer vergleichsweise größeren Fläche verteilt wird und nur in geringerem Maße eine Verstopfung stattfindet.At least one layer 2 of the filter bag 1 is formed embossed and comprises at regular intervals elevations 6, which are connected to one another via planar sections 7, as in FIG. 2 is shown. The height h of the projections 6 may be formed in a range between 2 mm to 5 mm in order to increase the effective filter area. The elevations 6 protrude from the flat sections 7, wherein the flat sections 7 form a flat filter surface, and this is the case in the filter bags according to the prior art over the entire surface. By impressing the profiles 6, however, the effective filter area is significantly increased. As a result, the layer of filter material 2 can also store more dust, since the dust is distributed over a comparatively larger area and only to a lesser extent does a blockage take place.

Die Profilierungen 6 sind in dem dargestellten Ausführungsbeispiel als Halbkugeln ausgebildet, die in einem Rasterabstand von 1,5 cm angeordnet sind und einen Durchmesser von 1 cm aufweisen. Es ist natürlich auch möglich, statt der Halbkugeln, Kästchen, Rauten, Dreiecke, Linien oder Schlangenlinien in das Filtermaterial 2 einzuprägen.The profiles 6 are formed in the illustrated embodiment as hemispheres, which are arranged at a grid spacing of 1.5 cm and have a diameter of 1 cm. Of course it is also possible, instead of the hemispheres, to impress boxes, diamonds, triangles, lines or serpentine lines in the filter material 2.

Für das Prägen wir ein Paar aus beheizten Walzen eingesetzt, die je nach Material, wie Polypropylen, PES, Polyamid oder anderen Materialien, auf Temperaturen zwischen 80° und 240° gebracht werden und zwischen denen das Filtermaterial unter Anpressdrücken von 0,1 bar bis 50 bar durchgeführt wird. Zum Einprägen eines Musters ist in der Regel eine Walze mit einer Gravur versehen, wohingegen die Gegenwalze als Glattwalze ausgeführt ist. Wenn dreidimensionale Geometrien eingeprägt werden, kann auch die Gegenwalze eine entsprechende Negativform der Prägewalze aufweisen. Durch das Walzenpaar können Profilierungen 6 in Form von Kästchen, Rauten, Dreiecken, Linien und Schlangenlinien eingeprägt werden, um die wirksame Filteroberfläche zu vergrößern. Durch Variationen der Prägebedingungen, insbesondere der Temperatur und dem Anpressdruck ist es möglich, das Filtermaterial in seiner Dichte und somit seiner Luftdurchlässigkeit und seinem Filtervermögen zu modifizieren. So kann durch eine besonders starke Verpressung das Filtermedium komprimiert werden, in Folge dessen werden die Porendurchmesser vermindert und die Filtereffizienz insbesondere gegenüber kleinen Partikeln gesteigert.For embossing we use a pair of heated rollers, which, depending on the material, such as polypropylene, PES, polyamide or other materials, are brought to temperatures between 80 ° and 240 ° and between which the filter material under contact pressures from 0.1 bar to 50 bar is performed. For embossing a pattern, a roll is usually provided with an engraving, whereas the counter roll is designed as a smooth roll. If three-dimensional geometries are embossed, the mating roll can also have a corresponding negative mold of the embossing roll. Profiles 6 in the form of boxes, diamonds, triangles, lines and serpentine lines can be embossed by the roller pair in order to enlarge the effective filter surface. By varying the embossing conditions, in particular the temperature and the contact pressure, it is possible to modify the filter material in its density and thus in its air permeability and filterability. Thus, the filter medium can be compressed by a particularly strong compression, as a result, the pore diameter are reduced and increased the filter efficiency, especially against small particles.

Es ist natürlich auch möglich, beim Verprägen besondere Formen vorzusehen, um auch optische Effekte zu erreichen oder eine bestimmte Funktionalität zu gewährleisten. Auch ist es möglich, nicht die gesamte Beuteloberfläche zu prägen, sondern nur einen bestimmten Bereich, z.B. den Bereich, der der Einströmöffnung gegenüberliegt, durch Verprägen mechanisch zu verstärken, da dieser Bereich meist durch auftreffende Partikel mechanisch besonders beansprucht ist. Der Bereich gegenüber der Einströmöffnung 5 kann daher durch Verprägen verfestigt werden, also eine geringere Schichtdicke aufweisen als der umgebende Bereich.Of course, it is also possible to provide special shapes during embossing in order to achieve optical effects or to ensure a certain functionality. It is also possible not to emboss the entire bag surface but only a certain area, e.g. mechanically reinforce the area opposite the inlet opening by embossing, since this area is usually mechanically stressed particularly by impinging particles. The area opposite the inflow opening 5 can therefore be solidified by embossing, that is, have a smaller layer thickness than the surrounding area.

Das Filtermaterial 2 des Filterbeutels 1 ist vorzugsweise eine Kombination verschiedener Lagen, wobei ein Vorfiltervlies, ein Grobstaubspeicher und ein Feinfilter und eine stabilisierende Lage eingesetzt werden können. Hierbei hält der Vorfilter groben Schmutz größer 1 mm zurück, weist eine Luftdurchlässigkeit von mehr als 1000 1/qm x s, eine Dicke von weniger als 0,5 mm und ein Flächengewicht zwischen 15 bis 100 g/qm auf. Der Vorfilter besteht vorzugsweise aus einem Spinnvlies, auch Spunbond genannt, einem Gittergelege oder einer perforierten oder geschlitzten Folie. Der Grobstaubspeicher speichert groben Schmutz von kleiner als 1 mm, weist eine Luftdurchlässigkeit von mehr als 1000 1 /qm x s, eine Dicke von 0,5 mm bis 5 mm, vorzugsweise etwa 1 mm bis 2 mm und ein Flächengewicht zwischen 20 bis 100 g/qm auf.The filter material 2 of the filter bag 1 is preferably a combination of different layers, wherein a Vorfiltervlies, a Grobstaubspeicher and a fine filter and a stabilizing layer can be used. Here, the pre-filter coarse dirt greater than 1 mm back, has an air permeability of more than 1000 1 / sqm xs, a thickness of less than 0.5 mm and a basis weight between 15 to 100 g / sqm. The prefilter is preferably made of a spunbonded nonwoven, also called spunbond, a scrim or a perforated or slit film. The coarse dust accumulator stores coarse dirt of less than 1 mm, has an air permeability of more than 1000 l / m² xs, a thickness of 0.5 mm to 5 mm, preferably about 1 mm to 2 mm and a basis weight between 20 to 100 g / sqm on.

Der Grobstaubspeicher besteht vorzugsweise aus einem trocken oder nassgelegten Vlies, das durch vernadeln oder wasserstrahlen, durch Klebepulver oder Bicomponentenfasern oder andere übliche Verfestigungsverfahren verfestigt sein kann. Weiterhin kann der Grobstaubspeicher einen Fasergradienten sowohl bezüglich des Faserdurchmessers (zunehmender Faserdurchmesser zur Anströmseite hin) als auch der Faserdichte (zunehmende Faserdichte zur Abströmseite hin) aufweisen. Der Gradient kann dabei auch durch mehrere aufeinanderfolgenden Vlieslagen mit ebengenannten Eigenschaften ausgebildet werden. Ebenso geeignet ist ein offenporiger Schaum.The coarse dust storage preferably consists of a dry or wet-laid nonwoven which may be solidified by needling or jetting, by adhesive powder or bicomponent fibers or other conventional consolidation processes. Furthermore, the coarse dust accumulator may have a fiber gradient both in terms of the fiber diameter (increasing fiber diameter towards the upstream side) and the fiber density (increasing fiber density towards the downstream side). The gradient can also be formed by a plurality of successive nonwoven layers having just mentioned properties. Also suitable is an open-cell foam.

Der Feinfilter hält feinen Schmutz größer als 0.0001 mm zurück, und weist eine Luftdurchlässigkeit von mehr als 2001/qm x s, einer Dicke kleiner 0.5 mm und einem Flächengewicht zwischen 15 - 80 g/qm auf.The fine filter retains fine dirt larger than 0.0001 mm, and has an air permeability of more than 2001 / sqm x s, a thickness of less than 0.5 mm and a basis weight between 15 - 80 g / sqm.

Der Feinfilter besteht vorzugsweise aus einem Spinnvlies, einem Meltblow oder einer Spinnvlies-Meltblow Kombination wie SM,SMS, SMMS, SMSMS, etc. Die stabilisierenden Lage weist eine Luftdurchlässigkeit von mehr als 500 1/qm x s, eine Dicke kleiner 1 mm und ein Flächengewicht zwischen 15 - 100 g/qm auf und besteht vorzugsweise aus einem Spinnvlies, einem Gittergelege oder einer perforierten oder geschlitzten Folie.The fine filter preferably consists of a spunbonded nonwoven fabric, a meltblown or a spunbonded meltblown combination such as SM, SMS, SMMS, SMSMS, etc. The stabilizing layer has an air permeability of more than 500 l / qm xs, a thickness of less than 1 mm and a basis weight between 15 - 100 g / qm and preferably consists of a spunbonded nonwoven fabric, a scrim, or a perforated or slit film.

Alternativ ist es möglich, bei reißfester Ausführung des Grobstaubspeichers auf die Vorfilterschicht zu verzichten.Alternatively, it is possible to dispense with tear-resistant design of the coarse dust storage on the prefilter.

Weiterhin vorteilhaft ist es, neben der Feinfilterschicht eine zusätzliche Feinstfilterschicht in Form einer Lage aus Nanofasern mit einem Faserdurchmesser von 10 - 2000 nm einzubringen.In addition to the fine filter layer, it is also advantageous to introduce an additional ultrafine filter layer in the form of a layer of nanofibers with a fiber diameter of 10-2000 nm.

Die Nanofaserschicht hält feinen Schmutz zurück und weist eine Luftdurchlässigkeit von mehr als 200 1/qm x s, einer Dicke kleiner 0.1 mm und ein Flächengewicht zwischen 0.01 - 2 g/qm auf.The nanofiber layer retains fine dirt and has an air permeability of more than 200 l / m² x s, a thickness of less than 0.1 mm and a basis weight between 0.01 - 2 g / sqm.

Vorzugsweise ist die Nanofaserschicht direkt auf der Feinfilterschicht, z.B. einem Meltblow abgelegt.Preferably, the nanofiber layer is directly on the fine filter layer, e.g. filed a meltdown.

Hierbei ist sowohl eine Schicht Nanofasern auf der Abströmseite denkbar, als auch eine Schicht auf der Anströmseite, sowie zur Erhöhung der Filterleistung sowohl auf der An- wie Abströmseite.Here, both a layer of nanofibers on the downstream side is conceivable, as well as a layer on the upstream side, as well as to increase the filter performance both on the inlet and outflow side.

Alternativ sind aber auch andere Trägermedien für die Nanofaserschicht geeignet, insbesondere SpunbondAlternatively, however, other carrier media are suitable for the nanofiber layer, in particular spunbond

In Figur 3 ist eine Tabelle zu dem Volumenstromabfall unterschiedlicher Filterbeutel gezeigt. Dabei wurden drei Beutel mit einer Fläche von 26 cm x 28 cm getestet, wobei der Abfall des Volumenstromes bei Beladung des Beutels mit DMT-Typ 8 Staub gemessen wurde.In FIG. 3 a table is shown for the volume flow drop of different filter bags. Three bags with an area of 26 cm x 28 cm were tested, whereby the drop in the volume flow was measured when loading the bag with DMT type 8 dust.

Beutel ABag A

Der Beutel A besteht aus einem fünflagigem Luftfiltermedium aus 20 g/qm Spunbond, 45 g/qm Vlies, 20 g/qm Spunbond, 25 g/qm Meltblow, 30 g/qm Spunbond, in das in einem Rasterabstand von 1,5 cm Halbkugeln mit einem Radius von 0.5 cm eingeprägt sind.The bag A consists of a five-ply air filter medium of 20 gsm spunbond, 45 gsm fleece, 20 gsm spunbond, 25 gsm meltblown, 30 gsm spunbond, in which a 1.5 cm grid of hemispheres are imprinted with a radius of 0.5 cm.

Hierdurch ist es möglich, die Oberfläche des Beutels um ca. 30% gegenüber einem nichtgeprägten Beutel zu vergrößern.This makes it possible to increase the surface of the bag by about 30% compared to a non-embossed bag.

Diese Oberflächenvergrößerung führt zu einer deutlich verbesserten Saugleistung bei Befüllung mit Prüfstaub im Vergleich zum Standard Vlies-Beutel.This increase in surface area leads to a significantly improved suction performance when filled with test dust compared to the standard nonwoven bag.

Auch ist die Filterleistung mit einer Emission von 0.3 mg/m3 Feinstaub gegenüber dem Standard Vlies-Beutel mit 0.35 mg/m3 leicht verbessert.Also, the filter performance with an emission of 0.3 mg / m 3 fine dust compared to the standard non-woven bag with 0.35 mg / m 3 is slightly improved.

Beutel BBag B

Der Beutel B besteht aus einem sechslagigem Luftfiltermedium aus 20 g/qm Spunbond, 45 g/qm Vlies, 20 g/qm Spunbond mit einer Auflage von 0.2 g/qm Nanofasern, 25 g/qm Meltblow und 30 g/qm Spunbond, in das in einem Rasterabstand von 1,5 cm Halbkugeln mit einem Radius von 0.5 cm eingeprägt sind.The bag B consists of a six-layered air filter medium of 20 gsm spunbond, 45 gsm nonwoven, 20 gsm spunbond with an overlay of 0.2 gsm nanofibers, 25 gsm meltblown and 30 gsm spunbond are imprinted in a grid spacing of 1.5 cm hemispheres with a radius of 0.5 cm.

Durch die zusätzliche Nanofaser-Feinfilterschicht ist die Filterleistung mit einer Emission von 0.19 mg/m3 Feinstaub gegenüber dem Standard Vlies-Beutel mit 0.35 mg/m3 deutlich verbessert.The additional nanofiber fine filter layer significantly improves the filter performance with an emission of 0.19 mg / m3 fine dust compared to the standard nonwoven bag with 0.35 mg / m3.

Allerdings nimmt aufgrund der erhöhten Filterleistung die Saugleistung nicht in dem Maße zu, wie es aufgrund der Beuteloberflächenvergrößerung zu erwarten wäre.However, due to the increased filter performance, the suction power does not increase to the extent that would be expected due to bag surface enlargement.

Beutel CBag C

Der Beutel C ist ein Standard Vlies-Beutel aus einem fünflagigem Luftfiltermedium aus 20 g/qm Spunbond, 45 g/qm Vlies, 20 g/qm Spunbond, 25 g/qm Meltblow sowie 30 g/qm Spunbond, der nicht verprägt ist und eine glatte Oberfläche aufweist.The bag C is a standard fleece bag made of a five-ply air filter medium of 20 gsm spunbond, 45 gsm fleece, 20 gsm spunbond, 25 gsm meltblown and 30 gsm spunbond which is unembossed and one smooth surface.

Gemäß einer weiteren Ausführungsform weist ein Filterbeutel Profilierungen in Form von länglichen parallel zueinander angeordneter Rippen auf. Der Abstand zwischen zwei benachbarten Rippen ist dabei vorzugsweise kleiner 1 cm, so dass eine gewellte Struktur erhalten wird. Die Höhe der Rippen liegt zwischen 2 bis 7 mm. Durch dir Rippen wird die Luftleitung außerhalb des Filterbeutels zu dem Saugkanal verbessert. Denn im Staubsauger liegt der Filterbeutel an den Innenwänden der Staubkammer an und die Luft muss nicht nur den Beutel durchströmen, sondern dann auch noch zwischen der Außenwand des Filterbeutels und der Staubsaugerkammer hindurch zum Motor geleitet werden. Da der Filterbeutel sich im Betrieb aufbläst, liegt er relativ dicht an die Wand der Kammer an. Dadurch ist der Weg für die Luft teilweise versperrt, was zu einem Saugleistungsverlust führt. Dieser Erscheinung wirken die Gerätehersteller meist durch Einbringung von Abstandsrippen in den Staubraum entgegen, um Kanäle zur Lufthinleitung zum Motor bilden.According to a further embodiment, a filter bag has profiles in the form of elongated ribs arranged parallel to one another. The distance between two adjacent ribs is preferably less than 1 cm, so that a corrugated structure is obtained. The height of the ribs is between 2 to 7 mm. By ripping the air line outside the filter bag is improved to the suction channel. Because in the vacuum cleaner, the filter bag rests on the inner walls of the dust chamber and the air must not only flow through the bag, but then also between the outer wall of the filter bag and the vacuum cleaner chamber are passed through to the engine. Since the filter bag inflates during operation, it rests relatively close to the wall of the chamber. As a result, the path for the air is partially blocked, resulting in a Saugleistungsverlust. Device manufacturers usually counteract this phenomenon by introducing spacer ribs into the dust chamber to form ducts for air intake to the engine.

Durch die Prägung, insbesondere durch die Vorsehung länglicher Rippen kann der Abstand zwischen Filterbeutel und der jeweiligen Wand zur Staubkammer auch ohne diese Abstandsrippen sicherstellt werden. Dadurch ergibt sich eine bessere Saugleistung, weil der Abstand zwischen Außenwand des Filterbeutels und der Wand der Staubkammer eine bessere Luftströmung erlaubt. Zudem kann die Gestaltung des Staubraumes durch Weglassen der Abstandsrippen vereinfacht werden, was Materialeinsparungen bei der Herstellung der Staubkammer erlaubt.By embossing, in particular by the provision of elongated ribs, the distance between the filter bag and the respective wall to the dust chamber can be ensured even without these spacer ribs. This results in a better suction performance, because the distance between the outer wall of the filter bag and the wall of the dust chamber allows better air flow. In addition, the design of the dust chamber can be simplified by omitting the spacer ribs, which allows material savings in the production of the dust chamber.

Zur Herstellung solcher Luftleitkanäle können neben länglicher Rippen auch andere Profilierungen oder eine Kombination verschiedener Profilierungen verwendet werden. Der Abstand zwischen den Profilierungen kann dabei 0,5 bis 1,5 cm betragen, während die Höhe der Profilierungen rund 2-5 mm, vorzugsweise 3-4 mm beträgt. For the production of such air ducts other profiles or a combination of different profiles can be used in addition to elongated ribs. The distance between the profiles can be 0.5 to 1.5 cm, while the height of the profilings is about 2-5 mm, preferably 3-4 mm.

Claims (9)

  1. Filter bag (1) for a vacuum cleaner, with an inflow opening (5) through which air to be cleaned can flow into the filter bag (1) in order to then flow through the filter material of the filter bag and in that case be cleaned, wherein the filter material comprises at least one layer of non-woven material and wherein the filter material is stamped at least in a region and the effective filter area is increased by a profiling of the filter material, characterised in that the profilings (6) are formed as spherical segments with a diameter of 4 millimetres to 40 millimetres.
  2. Filter bag according to claim 1, characterised in that the effective filter area is increased by the profiling (6) of the filter material relative to a planar smooth form of the filter material by more than 10%, preferably by more than 20%.
  3. Filter bag according to claim 1 or 2, characterised in that the profilings (6) protrude from the plane of the filter material by at least 2 millimetres, preferably by more than 3 millimetres.
  4. Filter bag according to any one of claims 1 to 3, characterised in that the profilings (6) are formed as spherical segments with a diameter of 6 millimetres to 20 millimetres.
  5. Filter bag according to any one of claims 1 to 4, characterised in that the filter bag (2) comprises two layers of filter material which are welded together at the edge and at least one layer of filter material is stamped over the whole area.
  6. Filter bag according to any one of claims 1 to 5, characterised in that the filter material is of multi-layered construction and comprises a pre-filter, a coarse dust store and a fine filter.
  7. Filter bag according to any one of claims 1 to 6, characterised in that the filter material has an increasing fibre density towards the outflow side.
  8. Filter bag according to any one of claims 1 to 7, characterised in that the filter material comprises a layer of very-fine fibres, preferably with a fibre diameter between 10 nanometres and 1,000 namometres, particularly 100 nanometres to 500 nanometres.
  9. Filter bag according to any one of claims 1 to 8, characterised in that the profilings (6) are stamped by hot-calendering in the non-woven material.
EP08101938.2A 2007-04-20 2008-02-25 Filter bag for a vacuum cleaner Active EP1982625B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200720005847 DE202007005847U1 (en) 2007-04-20 2007-04-20 Filter bag for a vacuum cleaner

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EP1982625A2 EP1982625A2 (en) 2008-10-22
EP1982625A3 EP1982625A3 (en) 2014-02-12
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Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006014236A1 (en) 2006-03-28 2007-10-04 Irema-Filter Gmbh Fleece material used as a pleated air filter in a motor vehicle comprises thinner fibers homogeneously incorporated into thicker fibers
DE102009006583A1 (en) * 2009-01-29 2010-06-17 Neenah Gessner Gmbh Multi-layer filter material for liquid filtration, for manufacturing filter element, has three layers, where former layer is of wet fleece made of cellulose or synthetic fibers or mixture
ES2537101T3 (en) 2010-03-19 2015-06-02 Eurofilters Holding N.V. Vacuum cleaner filter bag
DE102010052155A1 (en) 2010-11-22 2012-05-24 Irema-Filter Gmbh Air filter medium with two mechanisms of action
DE102012011065A1 (en) * 2012-06-04 2013-12-05 Irema-Filter Gmbh Process for producing a nonwoven fabric
DE102012219341A1 (en) * 2012-10-23 2014-04-24 BSH Bosch und Siemens Hausgeräte GmbH Dust collector bag for vacuum cleaner, has inlet opening that is provided to intake the duct-acted upon suction air, and air-permeable foam layer that is arranged on the exhaust side of filter layer
DE102013008391A1 (en) * 2013-04-23 2014-10-23 Mann + Hummel Gmbh Filter medium, in particular air filter medium, and filter element, in particular air filter element, with a filter medium
DE102013008402A1 (en) 2013-05-16 2014-11-20 Irema-Filter Gmbh Nonwoven fabric and process for producing the same
DE102014009707A1 (en) * 2014-07-02 2016-01-07 Mann+Hummel Gmbh Filter medium, filter element with a filter medium, filter system and method for producing a filter medium
DE102014117506A1 (en) * 2014-11-28 2016-06-02 Filta Co., Ltd Filter medium with large pleat spacing

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Publication number Priority date Publication date Assignee Title
DE20101466U1 (en) 2001-01-27 2001-04-19 Wolf Gmbh Filter device that can be used in a vacuum cleaner
DE20110838U1 (en) * 2001-06-30 2001-08-23 Melitta Haushaltsprodukte Dust bag for a vacuum cleaner

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EP1982625A2 (en) 2008-10-22
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