EP1804635B1 - Vacuum cleaner filter bag and use of said bag - Google Patents

Abstract

The filter bag (1) comprises two rectangular fleece or paper sheets (6) seam welded along the perimeter (7) with an opening (3) to receive the dust laden air stream behind which is a circular, square or rectangular deflector (2) with a baffle plate opposite the opening supported by side walls having openings for the air flow. Within the bag on the wall opposite the opening is an air permeable sheet (4) partially attached to the wall.

Description

The invention relates to a vacuum cleaner filter bag and the use of a vacuum cleaner filter bag in a vacuum cleaner.

An important goal in the development of vacuum cleaner filter bags is to increase the service life of the filter bag. The operating time over which a vacuum cleaner filter bag can be used until it is filled with dust and / or the pores of the filter material are clogged, should be as long as possible, while at the same time the highest possible suction power of the vacuum cleaner is sought over this time. In order to solve the problems associated therewith, various approaches are known from the prior art.

For example, shows the EP 0 960 645 a multi-layer vacuum cleaner filter bag assembly, wherein in the air flow direction, a coarse filter layer is disposed in front of a fine filter layer. In the vacuum cleaner filter bag sucked particles thus hit first on the coarse filter layer in which larger particles in particular should be stored. For this purpose, the coarse filter layer should have a relatively high thickness and a high pore volume. This can delay a clogging of the bag over a longer period of time.

The EP 1 123 724 shows a multi-layer vacuum cleaner bag, which comprises a support layer of paper, the raw gas side is covered by a pre-filter made of microfibers, which performs the function of a release layer and is temporarily lifted from the support layer. This separating layer completely covers the base layer to ensure that the filter bag is sufficiently stable and filter-effective even when the paper layer is completely destroyed.

From the US 5,647,881 is a vacuum cleaner filter bag is known, which has on its inside a loose, covering the entire inside of the bag diffusion layer. This diffusion layer serves to protect the filter layer following in the direction of flow from destruction by high-velocity particles.

A similar purpose is in the WO 93/21812 tracked. Here, a protective layer in the form of a strip is provided inside the vacuum cleaner filter bag, which is also intended to prevent damage to the vacuum cleaner filter bag. This protective layer is arranged such that particles entering the filter bag through an inlet opening impinge directly on the strip, so that the subsequent layer remains protected.

From the US 2,848,062 a filter bag is known in which a layer of abrasion resistant material is arranged on the inside. The dust cleaner also has a deflection screen.

Starting from the known prior art, it is an object of the present invention to provide vacuum cleaner filter bag, which have a further improved service life, so that a vacuum cleaner can be operated over a longer period of high suction power.

This object is achieved by a vacuum cleaner filter bag according to claim 1.

• im Innem des Staubsaugerfilterbeutels im Bereich der Einlassöffnung angeordnet ist und
• derart ausgebildet ist, dass ein durch die Einlassöffnung eintretender Luftstrom durch die Ablenkeinrichtung ablenkbar ist, und

einer luftdurchlässige Materiallage,

• die im Innern des Staubsaugerfilterbeutels angeordnet ist,
• die an wenigstens einer Stelle mit dem Staubsaugerfilterbeutel verbunden ist, und
• die wenigstens einen Teil aufweist, der mit dem Staubsaugerfilterbeutel unverbunden ist und einen Teil des Randes der Materiallage einschließt.

According to the invention, a vacuum cleaner filter bag is provided with an inlet opening, with
a deflector, the

• is arranged in the interior of the vacuum cleaner filter bag in the region of the inlet opening and
• is formed such that an entering through the inlet opening air flow is deflected by the deflecting, and

an air-permeable material layer,

• which is arranged inside the vacuum cleaner filter bag,
• which is connected in at least one place with the vacuum cleaner filter bag, and
• which has at least one part unconnected to the vacuum cleaner filter bag and enclosing part of the edge of the sheet of material.

It has surprisingly been found that such a combination of a deflector and a sheet of material having an unconnected portion enclosing a portion of the edge of the sheet of material provides a substantial improvement in the life of the vacuum cleaner filter bag. The deflection device ensures that an airflow entering through an inlet opening of the vacuum cleaner filter bag does not strike directly against the inside of the bag opposite the inlet opening. An incoming air stream may thus flow under the at least partially unconnected with the vacuum cleaner filter bag material layer, so that it is at least partially spaced from the inside of the vacuum cleaner filter bag. This air flow can continue to pass through the material layer away from the bag wall in the direction of the bag interior, resulting in a highly advantageous distribution of the filter cake inside the bag, whereby the service life of the vacuum cleaner filter bag is significantly increased. The special feature is therefore that the material layer can at least partially be underflowed by an air flow, which can then pass through the material layer into the interior of the bag again.

The connection of the material layer to the at least one point can be provided on the side facing the inlet opening and / or the side of the material layer facing away from the inlet opening, in FIG. The unconnected part, however, is not connected to the vacuum cleaner filter bag either on the side facing the inlet opening or on the side remote from the inlet opening. The at least one part forms a coherent piece of the material layer. The edge of the material layer comprises the side edges of the material layer; For example, if the material layer continues to have a slot, the edge also includes the edges of the material layer at the slot.

The material layer may have a smaller area than the area of the inside of the material layer. This advantageously enables an underflow of the material layer.

The area of the at least one part can make up at least 20% of the area of the material layer. By a sufficiently large unconnected part of the effect described above is enhanced.

Through the at least one part, a convex amount can be formed on a surface of the material layer.

heißt konvex, wenn mit je zwei Punkten P und Q aus dieser Menge auch alle Punkte der Verbindungsstrecke zwischen P und Q zu M gehören. Der Begriff konvex wird somit in der herkömmlichen Bedeutung verwendet, wie er beispielsweise in I. N. Bronstein, K. A. Semendjajew, Taschenbuch der Mathematik, 25. Auflage 1991, B. G. Teubner Verlagsgesellschaft und Verlag Nauka, Kapitel 3.1.2 . erwähnt ist. Zu den konvexen Mengen in der Ebene gehören beispielsweise Dreiecke, Rechtecke oder Kreisscheiben. Diese Bedeutung ist bei einer ebenen Materiallage maßgeblich.The term convex has the following meaning. A lot $M\subseteq {<figure-callout\; id="2"\; label="R"\; filenames="imgf0001.png,imgf0002.png"\; state="\{\{state\}\}">\Re </figure-callout>}^2$

is called convex if with every two points P and Q from this set also all points of the connection path between P and Q belong to M. The term convex is thus used in the conventional sense, as it is for example in IN Bronstein, KA Semendjajew, Taschenbuch der Mathematik, 25th edition 1991, BG Teubner Verlagsgesellschaft and Verlag Nauka, chapter 3.1.2 , is mentioned. For example, the convex sets in the plane include triangles, rectangles, or slices. This meaning is decisive for a flat material layer.

heißt konvex, wenn mit je zwei Punkten P und Q aus dieser Menge auch alle Punkte der Verbindungsstrecke auf der Oberfläche zwischen P und Q zu M gehören. Diese Bedeutung ist bei einer gekrümmten Materiallage maßgeblich.A set M on a two-dimensional, possibly curved surface in three-dimensional space

is called convex, if with two points P and Q from this set also all points of the connection path on the surface between P and Q belong to M. This meaning is decisive for a curved material layer.

By means of such an unconnected part of the material layer, which encloses a part of the edge of the material layer and forms a convex amount on the surface of the material layer, it is ensured in a particularly suitable manner that an air flow can sufficiently remove the material layer from the inside of the bag and flow under the material layer ,

The vacuum cleaner filter bag may be formed as a flat bag. In this case, it is preferable to judge the convexity in the flat state of the vacuum cleaner filter bag.

The at least one part may include the projection point resulting from a perpendicular projection of the geometrical center of gravity of the material layer onto the surface on one side of the material layer.

This means that the unconnected part extends from one edge of the material layer to its middle. As a result, a relatively large part of the material layer is unconnected, which increases the effect of the material layer in combination with the deflection device and results in an additional increase in service life.

The at least one part may include a path leading through the projection point on the surface whose end points each form the edge of the material layer.

Distance is the shortest connection between the two endpoints. Thus, in this case, the part extends from one part of the edge to another part of the edge. This makes it possible for an air stream to flow through under the material layer.

The at least one part may include at least 10% of the edge of the sheet of material.

Such a lower limit allows a sufficient proportion of airflow to flow below the material layer to achieve the desired effect.

In particular, the at least one part may include at least 30%, in particular at least 50%, in particular at least 70%, in particular at least 90% and / or in particular at most 95%, in particular at most 70%, of the edge of the material layer.

The at least one part, in particular the convex amount formed thereby, can make up an area of at least 40%, in particular at least 60%, in particular at least 80%, of the surface of the material layer.

In the previously described vacuum cleaner filter bag, the material layer may have a polygonal, in particular quadrilateral, shape, and the at least one part may include a part of at least two, in particular opposite, side edges of the material layer.

The material layer may be connected to the vacuum cleaner filter bag at a predetermined amount of points, preferably at exactly two points, and / or at two seams of the vacuum cleaner filter bag.

These variants allow a simple production of the vacuum cleaner filter bag with simultaneous advantageous underflow of the material layer by an air flow.

In particular, the material layer may have a rectangular shape and be connected to the vacuum cleaner filter bag only along two, in particular opposite, side edges, in particular the short sides.

In the case of the vacuum cleaner filter bags described above, the material layer can be glued or welded to the vacuum cleaner filter bag, in particular the inside of the bag, for example.

Furthermore, the material layer can comprise a nonwoven fabric, for example comprising a fine-fiber fleece (meltblown), a spunbond, a wet-laid nonwoven and / or a dried fleece, a paper or an air-permeable film, for example a perforated or slotted film.

The strip of material may have an air permeability of 100-10000 l / (m ² s), more preferably of 1000-8000 l / (m ² s), most preferably 1500-5000 l / (m ² s).

In the vacuum cleaner filter bags, the material layer may have an area of 10 - 80%, preferably 15 - 30% of the area of the inside of the bag.

This ensures, on the one hand, that not too much of the inside of the vacuum cleaner filter bag is covered by the material layer, so that the filter function of the bag wall is maintained as possible, and on the other hand, a sufficiently large layer of material is present, which is underflowed by an air flow and thereby set in motion can.

In the above-described vacuum cleaner filter bags, the material layer may be connected to the inlet opening of the vacuum cleaner filter bag opposite to the vacuum cleaner filter bag of the vacuum cleaner filter bag.

In this way, in combination with the deflection device arranged in the part of the inlet opening, it is achieved in a particularly advantageous manner that an air flow entering through the inlet opening and emerging from an outlet opening of the deflection device does not impinge directly on the surface of the strip of material facing the interior of the vacuum cleaner filter bag and the inlet opening. Depending on the configuration of the vacuum cleaner filter bag, however, other arrangements of the material layer can be selected, through which such an effect is achieved. For example, in the case of block bottom bags, the material layer may be arranged on a side wall which does not face the inlet opening.

In the vacuum cleaner filter bags described above, the at least one part may have at least one slot. Through such a slot, an underflow of the material layer is further promoted. If the material layer has at least one slot, in particular with a large length, the material layer can, for example, cover the entire surface of the inside of the vacuum cleaner filter bag. Nevertheless, an underflow is ensured by the at least one slot. In particular, the material layer may have a plurality of slots. In a flat bag, the material layer, if it has at least one slot, cover a bag wall, in particular the bag wall opposite the inlet opening over the entire surface.

The vacuum cleaner filter bag can be designed as a flat bag with two rectangular filter material layers connected to one another along the edge. In this case, the air-permeable material layer may be connected to the filter material layer opposite the inlet opening of the vacuum cleaner filter bag, in particular in the center. In particular, the material layer may have a rectangular shape with a width of 10-80%, preferably 25-45%, the width of the associated filter material layer and / or a length of 60-100%, preferably 100%, of the length of the associated filter material layer.

In the vacuum cleaner filter bags described above, the material layer may comprise at least one laminate, in particular an SMS. In a laminate, several layers of material are bonded together. For example, a spunbond, a meltblown and a spunbond are linked together in an SMS.

The material layer may comprise a film fiber net. Such film fiber networks arise, for example, in the fibrillation of extruded films and provide a precursor of film fiber nonwovens (see eg " Nonwovens ", W. Albrecht, F. Fuchs and W. Kittelmann, Wiley VCH, Weinheim, 2000 ).

The material layer may include netting. Such a fiber network can be obtained by extrusion and deposition of the fibers.

Alternatively, the material layer may comprise, in the vacuum cleaner filter bags described above, individual interconnected fibers or may consist of individual interconnected fibers. The directions of the longitudinal axes of the individual non-bonded fibers may include an angle of less than 45 ° to each other. In particular, the fibers can therefore be arranged parallel to one another.

By unconnected and unconnected single fiber is meant here that the fibers are not interconnected substantially along their longitudinal direction. However, this should not be ruled out that they can have a local connection to one another via the at least one connection point with the vacuum cleaner filter bag.

The fibers cited in this application have relatively large fiber lengths of a few centimeters up to the length or width of the vacuum cleaner filter bag. The non-interconnected fibers may be staple fibers, in particular polypropylene.

In particular, the fibers may be oriented substantially parallel to the direction of air flow at the inlet opening prior to deflection by the deflector or perpendicular to that direction, or may include an angle substantially between 0 ° and 90 ° to this direction substantially parallel to one another. In the case of a rectangular vacuum cleaner filter bag, the fibers may thus be arranged in particular parallel to one of the edges. These individual fibers can be arranged side by side with or without spacing from one another or else overlapping one another.

Each of the fibers has first and second ends in the fiber longitudinal direction and may be attached to both the first end and the second end with the vacuum cleaner filter bag be connected. In particular, the connection may be formed by a transverse connection over the ends, such as a transverse welding or adhesive seam. Generally, all or some of the fibers perpendicular to the fiber longitudinal direction may be connected to the vacuum cleaner filter bag by one or more line or sheet connections. Alternatively, the line or area connections may be at an angle of less than 90 ° to the fiber's longitudinal direction. By means of these linear or planar connections, which serve to connect the fibers to the vacuum cleaner filter bag, the individual fibers, which are otherwise unconnected with one another, can be connected to one another.

Individual fibers are an advantageous embodiment of the air-permeable material layer in that they are easy and inexpensive to manufacture, have high air permeability and easily allow the airflow passing through the inlet opening and deflected by the deflector to flow under them and thus to a spacing of the airflow from the fibers existing or this comprehensive material situation. By aligning the fibers and spacing between them, the air flow can be finely regulated.

Furthermore, the above-described vacuum cleaner filter bags may include an additional air-permeable sheet of material disposed inside the vacuum cleaner filter bag connected at least at one location to the vacuum cleaner filter bag and / or the other air-permeable sheet of material and having at least a portion connected to the vacuum cleaner filter bag and / or the other air-permeable material layer is unconnected and includes part of the edge of the material layer.

By means of such a further material layer, the above-described effect of the other or first material layer can be further enhanced. In particular, a part of an air flow can also flow between the two material layers. The two layers of material can be connected, for example, to two hems of the vacuum cleaner filter bag. Furthermore, one of the material layers or the two material layers may have at least one slot. For example, both layers of material may have at least one slot at a different position. The material layers can be arranged at different positions or one above the other in the vacuum cleaner filter bag.

In the vacuum cleaner filter bags, the deflector may at least partially surround the inlet opening of the vacuum cleaner filter bag and be secured to the bag inner side. In particular, a stable arrangement of the deflection device is obtained which can reliably fulfill its task even at high flow velocities.

In particular, the deflecting device can be designed to split the air flow into at least two partial flows.

By such a division into two or more part streams a more uniform distribution of the filter cake in the vacuum cleaner filter bag is achieved. In addition, the number of particles per partial flow is reduced in comparison with the incoming air flow, which reduces the burden of the bag walls by the individual partial flows.

The deflecting device can be designed to divide the air stream into at least two partial streams with opposite directions of flow.

In the deflection device according to the invention, air enters the flow direction (inlet flow direction) through an inlet opening of the deflection device and is deflected therein, so that a change in the flow direction in the deflection device with respect to the flow direction at the inlet opening occurs. By flow direction of the air flow or air flow direction is meant the main flow direction of the air, which runs generally parallel to a wall, for example a vacuum cleaner pipe or nozzle. During operation of the vacuum cleaner, such a main flow direction results at every point through the vacuum cleaner tube into the bag, even if turbulence may possibly occur at individual points.

Opposing flow directions means that both flow directions have a component in the plane perpendicular to the flow direction, with which an air flow enters the deflection device, ie a component perpendicular to the inlet flow direction, wherein the two components enclose an angle of about 180 ° and wherein the components are each greater in this plane than the corresponding component parallel to the inlet flow direction. This means that (in vectorial view of the flow direction) the two partial flow directions are arranged in anti-parallel in the vertical projection in the plane perpendicular to the inlet flow direction.

The deflecting device may comprise at least one, preferably plane, deflecting surface opposite the inlet opening. By means of such a deflecting or baffle surface, in particular the velocity of the particles can be reduced in a suitable manner. A deflection surface opposite the inlet opening of the deflection device may in particular have a distance therefrom or a mean distance of between 1 cm and 15 cm, in particular 2 cm to 5 cm.

The at least one deflection surface may have a larger area than the area of the inlet opening. This largely avoids that an air flow is merely deflected around the deflection surface and then strikes the bag wall opposite the inlet opening with a substantially unchanged flow velocity. Instead, it is achieved by the same or larger area that the air flow is deflected so that it can flow in a suitable manner under the material layer. Each deflection surface may have an area of 15 cm ² to 100 cm ² , in particular 40 cm ² to 60 cm ² .

The at least one deflection surface may be arranged at a predetermined angle relative to the plane of the inlet opening.

By a suitable choice of the angle, the deflection of the air flow under different parameters, such as vacuum cleaner motor power, arrangement of the vacuum cleaner filter bag, or, whose geometry and dimensions, Einströmwinkel, arrangement and dimensioning of the material layer, etc. are adjusted and optimized.

In a parallel to the plane of the inlet opening arranged deflecting a perpendicular to the plane of the inlet opening incoming air flow is deflected or deflected by up to about 90 °, which favors an underflow of the material layer in an advantageous manner. In particular, the deflection surface can be arranged perpendicular to the inlet flow direction or parallel to the plane of the inlet opening of the deflection device.

The deflection device may be designed such that an air flow passing into the deflection device can be deflected in the deflection device by at least 45 °, preferably at least 60 °, more preferably at least 80 °.

This means that the air flow direction when exiting the deflector with the flow direction when entering the deflector includes an angle of at least 45 °. This results in an advantageous direction of air flow into the vacuum cleaner filter bag.

The deflection device may comprise the shape of a cylinder, truncated cone, cuboid or truncated pyramid, which has an inlet opening in the top surface and at least one outlet opening in the side wall.

By such forms, a stable structure of the deflection is achieved, at the same time by the inlet opening opposite base a suitable deflection or baffle surface for deflecting the air flow is formed.

The deflection direction of the previously described vacuum-cleaner filter bags can be designed such that, in a first position, they have a reduced extent, compared to a second position, perpendicular to the plane of the inlet opening.

Thus, the deflection is collapsible. Due to the smaller extent in the second position, the vacuum cleaner filter bag can be brought into a very compact form, in particular before use. This is of particular advantage in the case of flat bags, which can be folded up in particular for packaging to specific formats. By means of such collapsible deflection devices, it is possible to avoid that the thickness of the folded-up bags is substantially increased. Preferably, the deflecting device may be formed substantially flat in the second position.

The deflection device described above can be designed such that it can be brought by a suction air flow from the first position to the second position.

Thus, the vacuum cleaner filter bag during transport may have a deflector in the second position with a smaller extension, which then in operation of the Filter bag in the vacuum cleaner, for example, passes through the resulting due to the suction of air in the bag negative pressure in its operating position in which it then fulfills its deflection function.

The deflection device may comprise a spring element which exerts a restoring force on a part of the deflection device in such a way that the deflection device can be brought from the second position into the first position as a function of a suction air flow.

Such a spring element makes it possible for the deflecting device to change from the first position to the second position with reduced expansion perpendicular to the plane of the inlet opening when the suction air flow decreases, for example when the vacuum cleaner is switched off.

The deflection device may have fold lines, so that the deflection device can be brought from the first or second position into the second or first position. Such fold lines allow the desired folding or folding in a simple and reliable manner.

In the above-described vacuum cleaner filter bag, the baffles may be in the shape of a parallelepiped having an inflow opening in the cover surface surrounding the inlet opening and an outflow opening in a side surface, the outflow opening occupying the entire side surface and providing the fold lines at the side edges perpendicular to the side surface of the outflow opening the vacuum cleaner filter bag are formed as a flat bag, the material layer have a quadrangular shape, and the inlet opening opposite to the vacuum cleaner filter bag, and the deflector be arranged so that one of the fold lines in the flat state of the vacuum cleaner filter bag with a rim, which from the unconnected Part included, an angle of at least 15 °.

In particular, an angle of at least 30 °, in particular at least 45 °, in particular at least 60 °, in particular 90 °, are included. By such an arrangement of the deflector with respect to the material layer ensures that a substantial part of a deflected in the deflector air flow under the material layer can flow. Preferably, the edge with which the angle is included comprises a side edge of the material layer.

In the case of the vacuum cleaner filter bags described above, the deflecting device can furthermore be designed to close the inlet opening and / or inlet opening.

Thus, an additional closure element, which is often provided on a fixed to the outside of the vacuum cleaner filter bag holding plate, avoided, which greatly simplifies the construction and manufacture of the vacuum cleaner filter bag.

As an alternative to the further developments described, however, the deflecting device can also be rigid, so that collapsing is not possible.

The deflector of the previously described vacuum cleaner filter bags may comprise a substantially air-impermeable material, in particular a plastic, a dry or wet-laid nonwoven, a paper, in particular a cardboard, or a film.

This has the advantage that an air flow and the entrained particles are substantially completely deflected, so that no particle deposits form, in particular on the deflection device. Other materials than those mentioned above are also possible; In particular, a sufficient rigidity of the material is advantageous so that the deflector is not excessively moved by the air flow.

The deflecting device may in particular be glued or welded to the filter material of the vacuum cleaner filter bag.

The invention further provides the use of a vacuum cleaner bag with a material layer in a vacuum cleaner with a deflector formed as part of a nozzle for a vacuum cleaner, further connecting means for connecting the deflector to a spigot in turn connecting the vacuum cleaner filter bag to a suction pipe of the vacuum cleaner , includes, ready,
wherein the connecting device and the deflecting device are formed such that the deflecting device is arranged in the interior of the vacuum cleaner filter bag during operation of the vacuum cleaner, and that an air flow entering the connecting device is deflected in the deflecting device, and
wherein the sheet of material is disposed inside the vacuum cleaner filter bag, connected to the vacuum cleaner filter bag at at least one location, and having at least a part unconnected to the vacuum cleaner filter bag and enclosing part of the edge of the sheet of material.

Analogous to the case of the vacuum cleaner filter bag described above, the surprising and advantageous effect is also achieved in the case of the use of a vacuum cleaner filter bag having a material layer in combination with a deflector provided on the vacuum cleaner side

In this use of a vacuum cleaner filter bag, the material layer and the deflecting device can be developed analogously to the previously described vacuum cleaner filter bag.

In particular, the material layer may have a smaller area than the area of the inside of the vacuum cleaner filter bag. Furthermore, the area of the at least one part can make up at least 20% of the surface of the material layer.

Through the at least one part, a convex amount can be formed on a surface of the material layer.

Furthermore, in use, the at least one part may include the projection point resulting from a perpendicular projection of the geometrical center of gravity of the material layer onto the surface on one side of the material layer.

In particular, the at least one part may include a path leading through the projection point on the surface, whose end points in each case touch the edge of the material layer.

In the above uses, the at least one part may include at least 10% of the edge of the material layer.

In particular, the at least one part may include at least 30%, in particular at least 50%, in particular at least 70%, in particular at least 90% and / or in particular at most 95%, in particular at most 70%, of the edge of the material layer.

The convex amount can make up an area of at least 40%, in particular at least 60%, in particular at least 80%, of the surface of the material layer.

The material layer in use may have a polygonal, in particular quadrilateral, shape, and the at least one part may include a part of at least two, in particular opposite, side edges of the material layer.

In the above-described uses, the material layer may be connected to the vacuum cleaner filter bag at a predetermined amount of points, preferably at exactly two points, and / or at two seams of the vacuum bag filter bag.

The material layer may have a rectangular shape and be connected to the vacuum cleaner filter bag only along two, in particular opposite side edges, in particular the short sides.

Furthermore, the material layer with the vacuum cleaner filter bag, in particular the inside of the bag; glued or welded.

The material of the material layer may comprise, in the above-described uses, a paper, a nonwoven, in particular comprising a meltblown, a spunbond, a wet laid nonwoven and / or a dry laid nonwoven, or an air permeable film.

The material layer may have an area of 10% -80%, preferably 15% -30%, of the area of the associated inside of the vacuum cleaner bag.

In the uses described above, the material layer may be connected to the inlet opening of the vacuum cleaner filter bag opposite to the vacuum cleaner filter bag.

The at least part of the material layer may have at least one slot in the uses described above.

In particular, in the above-described uses, the vacuum cleaner filter bag can be designed as a flat bag having two rectangular filter material layers connected to one another along the edge. In this case, the air-permeable material layer may be connected to the filter material layer opposite the inlet opening of the vacuum cleaner filter bag, in particular in the center. In particular, the material layer may have a rectangular shape with a width of 10-80%, preferably 25-45%, the width of the associated filter material layer and / or a length of 60-100%, preferably 100%, of the length of the associated filter material layer.

In the uses described above, the material layer may comprise at least one laminate, in particular an SMS. In a laminate, several layers of material are bonded together. For example, a spunbond, a meltblown and a spunbond are linked together in an SMS.

The vacuum cleaner filter bags in the uses described above may comprise a sheet of material comprising or consisting of individual interconnected fibers or a film fiber web.

Here, the directions of the longitudinal axes of the individual non-bonded fibers may include an angle of less than 45 ° to each other, and at least a portion of the individual fibers may be juxtaposed with or without spacing from each other or overlapping one another.

At least part of said fibers may in this case be connected to the vacuum cleaner filter bag at the two ends of the fibers in the fiber longitudinal direction, and / or a part of said fibers may be connected to the vacuum cleaner filter bag by one or more linear or planar connections.

Further, in use, the vacuum cleaner filter bags may comprise an additional air-permeable sheet of material disposed within the vacuum cleaner filter bag connected at least at one location to the vacuum cleaner filter bag and / or the other air-permeable sheet of material and having at least a portion associated with the vacuum cleaner filter bag and / or the other air-permeable material layer is unconnected and includes a part of the edge of the material layer.
The deflection device can be designed to split the air flow into at least two partial flows.

In particular, the deflecting device for dividing the air flow into at least two partial streams may be formed with opposite directions of flow.

According to a development of the above-described uses, the deflection device may comprise the shape of a cylinder, truncated cone, cuboid or truncated pyramid, which has an inlet opening in the cover surface and at least one outlet opening in the side wall.

The deflection device may in particular comprise at least one, preferably plane, deflection surface opposite the inlet opening. In this case, the at least one deflection surface may have an area that is the same size or larger than the area of the inlet opening. In particular, the at least one deflection surface may be arranged at a predetermined angle relative to the plane of the inlet opening.

In the uses described above, the deflecting device may comprise a substantially air-impermeable material, in particular a plastic, a dry or wet-laid nonwoven, paper, in particular cardboard, or a film.

The above-described features of the vacuum cleaner filter bag and the use of a vacuum cleaner filter bag can also be combined independently of one another in ways other than explicitly described.

Figur 1

eine Querschnittsansicht eines Staubsaugerfilterbeutels mit einer Ablenkeinrichtung und einer Materiallage;

Figur 2

eine vergrößerte Ansicht einer Ablenkeinrichtung in Querschnittsansicht;

Figur 3

eine perspektivische Ansicht einer Ablenkeinrichtung;

Figur 4

eine perspektivische Ansicht eines Stutzens für einen Staubsauger;

Figur 5

eine Querschnittsansicht eines Stutzens in einem Staubsaugergehause;

Figuren 6A bis 6H

Draufsichten auf die Innenseite eines Staubsaugerfilterbeutels mit einer darauf angeordneten Materiallage;

Figur 7

eine Draufsicht auf die Innenseite eines Staubsaugerfilterbeutels mit einer Materiallage mit einer Projektion einer Ablenkeinrichtung;

Figuren 8 bis 10

Grafiken mit Messungen des Volumenstroms für verschiedene Staubsaugerfilterbeutel.

Further features and advantages of the invention will be described below with reference to the drawing. It shows

FIG. 1

a cross-sectional view of a vacuum cleaner filter bag with a deflector and a material layer;

FIG. 2

an enlarged view of a deflector in cross-sectional view;

FIG. 3

a perspective view of a deflector;

FIG. 4

a perspective view of a nozzle for a vacuum cleaner;

FIG. 5

a cross-sectional view of a nozzle in a vacuum cleaner housing;

FIGS. 6A to 6H

Top views of the inside of a vacuum cleaner filter bag with a material layer arranged thereon;

FIG. 7

a plan view of the inside of a vacuum cleaner filter bag with a material layer with a projection of a deflector;

FIGS. 8 to 10

Graphs with volume flow measurements for different vacuum cleaner filter bags.

FIG. 1 is a very schematic representation of a Staubsaugerftterbeutels 1 with a deflector 2 which is arranged in the interior of the vacuum cleaner filter bag 1 in the region of the inlet opening 3 of the filter bag 1. Furthermore, the vacuum cleaner filter bag comprises an air-permeable material layer 4 in the form of a material strip, which is connected to the inlet opening 3 opposite to the vacuum cleaner filter bag on the inside 5 thereof.

In the example shown, the vacuum cleaner filter bag 1 is formed in the form of a flat bag. Such a flat bag is obtained if, for example, two rectangular filter material layers 6 are joined together along their side edges, for example glued or welded, so that along each side edge Hem 7 is created. Non-woven fabrics and / or conventional filter papers can be used as filter materials, for example. In particular, it may be a multilayer structure, as it is for example in the EP 0 960 645 is described. In the example shown, the material layer 4 is centrally connected to the filter material layer 6 opposite the inlet opening.

In the example shown, the deflection device 2 has the shape of a cuboid, in which two side surfaces each have an outlet opening which occupies the entire side surface in each case. In the case shown, the outlet openings are arranged parallel to the plane of the drawing, so that an air stream entering the deflection device 2 through the inlet opening is split into two partial streams with opposite flow directions, these partial streams emerging from the drawing plane or into the drawing plane from the deflection device escape. A detailed description of such a deflection device will be described below with reference to FIGS FIGS. 2 and 3 performed.

The material strip 4 can be connected to the vacuum cleaner filter bag in various ways, as long as it is possible for an air flow to flow between the material layer and the inner side of the bag. Examples of different ways to connect the material layer with the vacuum cleaner filter bag, in particular the inside of the bag, are on hand of FIGS. 6A to 6F explained. The material layer can be, for example, a spunbond or an SMS. However, other materials are also possible, such as with reference to FIGS FIGS. 8 to 10 is explained below.

FIG. 2 shows schematically in cross-sectional view an example of a deflector in cuboid shape. FIG. 3 is a perspective view of such a deflector, with some details of the FIG. 2 omitted here.

The base 8 of the cuboid deflection device 2 is arranged parallel to the plane of the inlet opening 3 or parallel to the plane of the inlet opening 9 of the deflection device and fulfills the function of a deflection surface or baffle plate. Two of the side surfaces perpendicular to the baffle plate each have an outflow opening, each occupy the entire side surface of the cuboid. The two other side surfaces (left and right in the view shown) are closed. Thus, a through the Inlet opening 3 and the inlet opening 9 incoming air flow divided into two partial flows, which are deflected relative to the inlet opening by 90 ° and flow towards the rear or vome (in the view shown) in the bag.

The dimensions of the cuboid deflection device can be 8 cm × 8 cm × 3 cm (width × depth × height) in the example shown. The material may be cardboard, for example.

In the example shown, the deflector 2 is designed such that it can be brought from a first to a second position. For this purpose, at the edges between the base 8 and the two side surfaces or between the side surfaces and the top surface creasing lines 10 are provided which allow a folding of the deflector to reduce the expansion of the deflector perpendicular to the plane of the inlet opening. Thus, appropriately equipped vacuum cleaner filter bag can be folded into this position in a compact manner and transport.

In the example shown, an (optional) spring element 11 is furthermore provided, which is designed here in the form of a bending spring. If a suction air flow is present, for example, by sucking air and thus a negative pressure is generated inside the bag, the deflector 2 is unfolded against the restoring force of the bending spring 11 and assumes its cuboid shape. With a weak or vanishing suction air flow, the bending spring 11 acts so that the side surfaces and the base 8 to the side (in the view shown to the left) are folded, so that the deflector is folded flat. In the flat folded state then the right side surface is substantially in a plane with the base 8. The bending spring 11 may be glued, for example, with the base and the right side surface. Alternatively, the bending spring between two layers of material (for example, cardboard), through which the base 8 and the side surface are formed, be clamped.

Such a collapsible deflection device can in particular also serve to securely close the inlet opening and the inlet opening. This eliminates the need for another closure element.

With the outside of the vacuum cleaner filter bag 1, a holding plate 12 is connected, with which the filter bag can be fixed in a vacuum cleaner housing. This holding plate can be glued or welded, for example, with the filter material 6.

As an alternative to the bending spring 11, for example, a permanent magnet in or on the holding plate 4 and a ferromagnetic element in or on one of the side surfaces or the base 8 of the deflector may be provided. Thus, a return device is also formed, which allows a folding of the deflection device with decreasing suction air flow.

In addition, as shown in the example, a sealing member 13 may be provided to be interposed between the deflector and the bag inner side. Alternatively, the sealing element can also be arranged within the deflecting device on the upper surface in which the inlet opening 9 is located. The sealing member 13 is provided around the entire inlet opening 3 around. By means of this sealing element 13, in particular, a suitable seal is achieved after insertion of a connecting piece 14, which establishes a connection to a vacuum cleaner tube. The sealing element may comprise, for example, an elastomer, a rubber or a closed-cell foam.

The deflection device can be connected in different ways to the inside of the bag. According to one possibility, the deflector is glued to the bag inner wall. Alternatively, the top of a deflection device, which is made of cardboard, for example, be coated with PP (polypropylene), so that at a welding of a PP-holding plate by means of ultrasound at the same time the deflector is welded to the bag wall.

As an alternative to the described cuboid shape, the deflection device can also assume a different shape. Possible shapes are for example a truncated cone, truncated pyramid or cylindrical shape.

In the embodiments described above, the deflector is provided on the bag side, ie, the vacuum cleaner filter bag itself comprises the deflector. An alternative to this is in the FIGS. 4 and 5 Illustrated in which a neck for a Vacuum cleaner is illustrated schematically, with which a vacuum cleaner filter bag can be used with a correspondingly arranged material layer.

FIG. 4 schematically shows a cylindrical nozzle 14 for a vacuum cleaner with a deflector 15 and a connecting device 16. The nozzle shown can be provided for example as a retrofit element for conventional vacuum cleaners.

During operation of the vacuum cleaner with such a nozzle, an air flow with a flow direction, which is schematically indicated by the arrow 17, enters the connecting device 16. The connecting device 16 serves to establish a connection of the nozzle 14 with a (not shown) connecting piece of a vacuum cleaner. The deflection device 14 has an inlet opening 18, into which an air flow from the connection device 16 of the connection piece enters the deflection device 15.

Analogous to the in FIG. 2 In the case shown, a planar deflection surface 19, which is formed by the base surface of the cylinder, is arranged opposite to the inlet opening 17 and parallel to the plane of the inlet opening 18. In the side wall 20 of the cylindrical deflector 15, two opposite outlet openings 21 are provided.

In the example shown, the nozzle 14 is integrally formed, for example as an injection molded part. In the direction of air flow 17, the connecting device 16 ends directly above the upper edge of the outlet openings 21. The side wall 20 of the deflecting device 15 thus only comprises a narrow edge area above the outlet openings 21.

In the example shown, two outlet openings are provided in the cylindrical neck. Alternatively, however, a different number of outlet openings, for example only one outlet opening or more than two outlet openings, may be provided. Furthermore, the neck can for example also be cuboid, truncated pyramidal or truncated cone-shaped.

In FIG. 5 is the arrangement of a nozzle 14, as in FIG. 4 is shown schematically in a vacuum cleaner housing in cross-sectional view. In the wall 22 of a vacuum cleaner housing, an opening 23 for receiving a fitting 24 of a suction pipe or a vacuum cleaner hose is provided. Such a connector 24 can be inserted into the opening 23 and fixed there, for example with a snap closure. This puts the connector 24 then also in the vacuum cleaner side provided connecting piece 25 of the vacuum cleaner.

The connecting piece 25 is connected to the wall 22 of the vacuum cleaner housing, for example glued. Alternatively, the connecting piece 25 may also be formed integrally with the wall 22. As a further alternative, the connecting piece 25 may also be arranged non-destructively releasably on the wall 22, for example, by being screwed thereto. The connecting piece 25 engages in the inlet opening 3 of a vacuum cleaner filter bag 1. This corresponds to the connecting piece 25 FIG. 5 the nozzle 14 in FIG. 2 ,

In the in FIG. 5 In the embodiment shown, the holding plate with which the vacuum cleaner filter bag is fixed in the vacuum cleaner is not shown.

The nozzle 14 may be connected in various ways with the connecting piece 25. For example, the nozzle 14 may be plugged or screwed on the outside of the connecting piece 25. Alternatively, the deflector can also be inserted into the connecting piece 25 (as shown in the figure) or screwed. Furthermore, it is possible to glue or weld the connecting piece and the nozzle with each other. Another alternative is to integrally form the connecting piece and the neck, for example as an injection molded part.

The connecting piece 14 comprises a connecting device 16 and a deflecting device 15. The connecting device 16 opens in the flow direction 17 into the inlet opening 18 of the deflecting device 15.

During operation of the vacuum cleaner, a stream of air is sucked through a vacuum cleaner tube or vacuum cleaner hose. The flow direction of this air flow runs in particular within the vacuum cleaner hose or pipe parallel to the wall. At the in FIG. 5 As shown, the flow direction is also when entering the vacuum cleaner housing and the connecting piece parallel to the wall of both the connecting piece 24 and the connecting piece 25, as shown schematically by the arrow 17, even if locally at individual points of the air flow Verwirbe-, lungs can occur.

By deflecting or baffle 19 of the deflector 15 of the air flow is divided into two partial streams whose flow directions at the outlet openings 21, as indicated by corresponding arrows, is rotated by about 90 ° with respect to the flow direction when entering the connecting device 16. Furthermore, the flow directions at the outlet openings are opposite to each other.

In the FIGS. 6A to 6F are various ways to connect a material layer with a vacuum cleaner filter bag, illustrated schematically. Shown is in each case the plan view of an inner side of the bag 5. It is the inside of the bag facing a rectangular filter material layer for a flat bag, said filter material layer is opposite to the inlet opening of the bag in prefabricated vacuum cleaner filter bag. This filter material layer is, for example, welded to the opposite filter material layer in which the inlet opening is located along the side edges, so that a seam 7 is formed on each edge.

In FIG. 6A a material layer 4 in the form of a rectangular strip is arranged centrally on the inside of the bag 5. The material layer has an area of about one third of the area of the associated filter material layer (bag wall) and thus an area of about one sixth of the inside of the entire vacuum cleaner filter bag. In this example, the material layer is connected to only two seams of the filter bag, in the view shown above and below, with the vacuum cleaner filter bag. This can be achieved, for example, by placing the material layer 4 in the manufacture of the vacuum cleaner filter bag between the two filter material layers and, during welding of the two filter material layers along the side edges, likewise being welded thereto. The material layer is thus connected in this way via two continuous welds with the vacuum cleaner filter bag.

However, the other two side edges (left and right in the view shown) are unconnected to the filter material layer, so that an air stream entering the vacuum cleaner filter bag is located between the material layer 4 and the inlet opening Bag inside 5 of the filter material layer can flow. In this way, the material layer is raised during operation of the vacuum cleaner or removed from the filter material layer and set in motion. The air flow can flow from below through the material layer in the direction of the interior of the vacuum cleaner filter bag. It has surprisingly been found that this leads to a significantly better service life and dust storage capacity of the bag over a longer period of time, as described below with reference to the FIGS. 8 to 13 is explained in more detail.

By the in FIG. 6A shown connection of the material layer with the vacuum cleaner filter bag, the surface of the material layer on the associated filter material layer side facing an unconnected part, which is shown by dashed lines. This part includes the left and right side edges of the material layer except for their corners and forms a convex amount in the form of a rectangle. This convex amount makes up almost the entire area (except for the weld at the top and bottom edges) of the surface of the material layer.

In the example of FIG. 6B is the material layer 4 connected only at two points 26 with the bag inner side 5. These points may, for example, be spot welds or glue dots. In the embodiment shown, the material strip is also arranged centrally, but does not extend in the longitudinal direction up to the hems 7 of the vacuum cleaner bag. In the example shown, a convex amount, which is formed by an unconnected part of the surface of the material layer and lies between the two connection points, is also drawn in a dashed line. As in the example of FIG. 6A The unconnected part closes both the vertical projection of the center (geometric center of gravity) of the material layer on its surface facing away from the inlet opening and a distance leading through this projection point, which extends from the left to the right edge of the material layer. In this way, an air flow can flow under the material layer.

The material strip 4 in FIG. 6C has rounded corners and is connected at four points 26 to the bag inner side 5 of the vacuum cleaner filter bag. In FIG. 6D the material layer 4 is given in the form of a rectangular strip. This strip of material is connected via a single weld 27 with the inside 5 of the vacuum cleaner filter bag. This weld 27 runs parallel to the left and right Side edge and through the center of the material layer. Two convex sets, each formed by an unconnected part, are indicated by dashed lines.

In FIG. 6E is the strip of material 4 as in FIG. 6A connected at two seams with the vacuum cleaner filter bag. Furthermore, an additional weld 27 is provided on the right side edge of the material layer 4. Thus, an air flow can flow only from the left side under the material layer.

FIG. 6F shows a circular layer of material, which is arranged centrally on the filter material layer of the Staubaugerfilterbeutels. This material layer is connected to the inner side of the bag at a single point 26, which is arranged in the middle of the material layer 4. Here, two unconnected parts each form a convex amount in the form of a circle segment.

In FIG. 6G The material layer 4 completely covers the filter material layer opposite the inlet opening and is connected to the seams 7 with the latter. The material layer has three slots 28 through which an air flow can flow under the material layer. In the example shown, a convex surface between two slits is indicated by dashed lines

In FIG. 6H the material layer again has a smaller area than the area of the bag wall connected therewith to the hems. Here, four slots 28 are provided perpendicular to the open side edges of the material layer, in order to further promote an underflow of the material layer.

In addition to the in FIGS. 6A to 6H shown embodiments, other alternatives are possible. In particular, the shape, the extent and the arrangement of the material layer can be modified. Furthermore, the material layer can also be otherwise connected, for example via a plurality of welding points, with the filter material layer on the inside of the bag. In addition, two or more layers of material may be provided, for example, two superimposed rectangular strips, as shown in FIG. 6A connected to the hem with the vacuum cleaner filter bag.

In particular, in the FIGS. 6A to 6H shown material layer of individual substantially (except via connections with the vacuum cleaner filter bag) with each other consist of unconnected fibers. These can be z. B. parallel or perpendicular to the longitudinal direction of the in the FIGS. 6a to 6e be aligned strip and connected at each end of the fibers in the fiber longitudinal direction with the bag inner side 5.

Alternatively or additionally, the fibers may pass through a weld or adhesive seam along or oblique to the width of the in the FIGS. 6a to 6e strip shown with each other and be connected to the bag inside 5. That is, in an example where the strip shown is made up of fibers arranged parallel to the strip direction, the fibers may be attached to the bag inner side 5 after parallel alignment by welding or gluing perpendicular to the fiber longitudinal direction. All fibers can be attached to the in Fig. 6a shown upper seam 7 of the vacuum cleaner filter bag are attached simultaneously in one operation and fastened to the lower seam 7 at the same time in another operation. Except for these attachments to the hems, the fibers are not interconnected.

FIG. 7 shows the top view of the inside 5 of a vacuum cleaner filter bag with a material layer 4 arranged thereon. In addition, the outlines of a collapsible deflector 2 are projected onto the surface of the material layer and the filter material layer. In the example shown, the deflection device comprises two outlet openings, each occupy an entire side surface of the cuboid shape, as soon as the vacuum cleaner filter bag is in operation. The outflow directions are indicated by two arrows. The deflecting device shown thus corresponds to the in FIG. 2 shown embodiment.

As FIG. 7 can be taken, includes each fold line 10 with a (in the view shown perpendicular) edge or a side edge of the material layer, which is enclosed by the unconnected part and thus not connected to the bag inner side, an angle α. This angle α is preferably at least 15 °. This makes it possible for a stream of air flowing out of the deflection device during operation of the vacuum cleaner filter bag to flow into the vacuum cleaner filter bag in such a manner that it can advantageously flow below the material layer 4. An angle α = 90 ° is particularly preferred in which the discharge directions are in the case of the deflection device shown stand perpendicular to the side edges of the material layer.

to you FIGS. 8 to 10 illustrate the surprising improvement of conventional vacuum cleaner filter bags through the use of a deflector and a sheet of material as previously described. In particular dust dusting tests were carried out with various vacuum cleaner filter bags, in which defined amounts of dust were sucked into the dust filter bag and the remaining volume flow was measured.

The investigations were carried out according to DIN EN 60312: 2005-02 and E DIN IEC 60312 / A100: 2005-06 available from Beuth Verlag, Berlin. Specifically, the tests correspond to the draft standard E DIN IEC 60312 / A100: 2005-06 with the changes described in Section 2.9 of DIN EN 60312: 2005-02. The experimental set-up was carried out as described in 2.9.1.1 to 2.9.1.3.

For the measurement of the volume flow (determination from the differential pressure in a measuring chamber in front of / behind the measuring orifice with a diameter of 40 mm) the measuring device described in the DIN EN 60312: 2005-02 under point 5.2.8.2 to 5.2.8.4 (version B) used. The test dust used was the premixed DMT Type 8 from the German Montan Technologie GmbH.

The vacuum cleaner used was a Miele S 5220, whose performance was set to maximum. The size of the flat bag was 317 x 330 mm. The material layer in the form of a rectangular strip connected to the inside of the bag of the filter material layer of a filter bag had a width of 130 mm. The deflector had the shape of a cuboid as in FIG. 3 shown and was analogous to FIG. 2 connected to the filter material of the vacuum cleaner filter bag. The material of the deflector was cardboard; the dimensions were 80 mm x 80 mm x 30 mm (length x width x height).

During the inspection, the vacuum cleaner filter bag to be tested was installed in the apparatus after the vacuum cleaner had warmed up for 10 minutes. The volume flow without dust load was read after 1 minute of running time of the device. Subsequently, the first 50 g portion of dust was sucked in within 30 seconds. After 1 minute, the self-adjusting volume flow (in m ³ / h) was read. This step was repeated for the following dust additions until 400 grams of dust had been added.

In this case, vacuum cleaner filter bags were compared to neither a deflection device nor a material layer which has a deflection device or a material layer, as well as a deflection device and a material layer.

In the figures, the volumetric flow readings (in l / s) are plotted against the amount of dust sucked in. Furthermore, below each graph is a table with the exact values of the respective measurement results at 0g, 50g, 100g, ..., 400g amount of dust.

The filter media used were obtained from Airflo Europe N.V., Overpelt, Belgium. The terms in the graphics have the following meaning.

The first abbreviation ("SMS" or "75CS") designates the filter material of the vacuum cleaner filter bag, ie the filter material layers from which the flat bag was made. "SMS" refers to a composite nonwoven fabric (composite) in the air flow direction, ie from the inside of the bag to the outside - a spunbond (17 g / m ² basis weight), a fine fiber fleece (meltblown) (24 g / m ² ) and a spunbonded nonwoven ( 25 g / m ² ). "75CS" is a composite nonwoven fabric consisting of - in the air flow direction - a spunbonded nonwoven (17 g / m ² ), a drained nonwoven of electrostatically charged split fibers (75 g / m ² ), a fine fiber nonwoven (24 g / m ² ) and a spunbonded nonwoven (25 g / m ² ).

The abbreviation "30K" indicates the presence of a deflector; if additionally an angle is indicated, then this is the angle α in FIG. 7 between the side edge of the deflector (perpendicular to the plane of the exit opening) and the unconnected side edge of the sheet of material.

"St" indicates that a material layer was connected to the inside of the filter material layer. The following abbreviation ("130CS" or 60SB ") explains what the material layer consisted of." 130CS "refers to a composite nonwoven fabric of a spunbonded fabric (17 g / m ² ), a drained nonwoven fabric of electrostatically charged split fibers (130 g / m ² ), a fine fiber fleece (24 g / m ² ) and a spunbonded nonwoven (25 g / m ² ). "60SB" is a spunbond with a basis weight of 60 g / m ^2. Without further specification, the material layer at the filter bag seams is connected to the inside ( FIG. 6A ); for the indication "2 points" a connection is according to FIG. 6B available.

Thus, for example, at "SMS + 30K 90 ° + St 130CS" a filter bag made of SMS material (as described above) comprising a deflector, whose fold lines are oriented perpendicular to the unconnected side edge of the material layer, and a material layer of 130CS material examined.

Out FIG. 8 one recognizes first that a filter bag only with a material layer but without deflection device ("SMS + 130CS ''and" SMS + 60SB ") has a deterioration in performance compared to a bag without material layer and without deflector (" SMS ") has the consequence The combination of a deflector with a layer of material, on the other hand, leads to a significant improvement with both a 60SB strip and a 130CS strip FIG. 6B with two points again an increase in performance.

Out FIG. 9 It can be seen that even with a filter material of the bag with a high dust holding capacity ("75CS", especially due to the drained nonwoven fabric), the combination of a deflector and a loose strip of material according to FIG. 6A a significant improvement in performance.

In FIG. 10 the influence of the arrangement of the deflector with respect to the loose strip of material is shown. The specified angle corresponds to the angle α in FIG. 7 ,

Even at an angle of 0 °, i. a parallel alignment of the fold lines of the deflector with respect to the unconnected side edges of the material layer, results in the long term (at higher amounts of dust) an improvement. However, the best result is achieved at an angle α = 90 °.

Claims (66)

1. A vacuum cleaner filter bag (1) with an inlet opening (3), with an air-permeable material layer (4) which is disposed inside the vacuum cleaner filter bag and is connected with the vacuum cleaner filter bag at at least one location,
   characterised in that
   the air-permeable material layer has at least one part which is not connected with the vacuum cleaner filter bag and includes one part of the edge of the material layer, and
   the vacuum cleaner filter bag comprises a deflection device (2) which is arranged inside the vacuum cleaner filter bag in the vicinity of the inlet opening and is designed so that an air flow entering through the inlet opening can be deflected by the deflection device.
2. A vacuum cleaner filter bag according to Claim 1, wherein the material layer has a smaller area than the area of the inside of the vacuum cleaner filter bag.
3. A vacuum cleaner filter bag according to Claim 1 or 2, wherein the area of the at least one part constitutes at least 20 % of the area of the material layer.
4. A vacuum cleaner filter bag according to any one of the preceding Claims, wherein a convex set is formed by the at least one part on an upper surface of the material layer.
5. A vacuum cleaner filter bag according to any one of the preceding Claims, wherein the at least one part includes the projection point which results from a perpendicular projection of the geometrical centre of gravity of the material layer on the upper surface on one side of the material layer
6. A vacuum cleaner filter bag according to Claim 4, wherein the at least one part includes a course on the upper surface passing through the projection point, the end points of which each contact the edge of the material layer.
7. A vacuum cleaner filter bag according to any one of the preceding Claims, wherein the at least one part includes at least 10 % of the edge of the material layer.
8. A vacuum cleaner filter bag according to any one of the preceding Claims, wherein the material layer is of polygonal, in particular quadrangular shape, and the at least one part includes one part of at least two, in particular opposing, side edges of the material layer.
9. A vacuum cleaner filter bag according to any one of the preceding Claims, wherein the material layer is connected with the vacuum cleaner filter bag at a predetermined number of points, preferably at exactly two points, and/or at two seams of the vacuum cleaner filter bag.
10. A vacuum cleaner filter bag according to any one of the preceding Claims, wherein the material layer is of rectangular shape and is connected with the vacuum cleaner filter bag only along two, in particular opposing, side edges, in particular of the short sides.
11. A vacuum cleaner filter bag according to any one of the preceding Claims, wherein the material layer comprises a non-woven fabric, in particular comprising a melt blown, a spun bond, a wet-laid .non-woven fabric and/or a dry-laid non-woven fabric, a paper or an air-permeable sheet.
12. A vacuum cleaner filter bag according to any one of the preceding Claims, wherein the material layer has an area of 10 to 80 %, preferably 15 to 30 %, of the area of the inside of the vacuum cleaner filter bag.
13. A vacuum cleaner filter bag according to any one of the preceding Claims, wherein the material layer is connected with the vacuum cleaner filter bag opposite the inlet opening of the vacuum cleaner filter bag.
14. A vacuum cleaner filter bag according to any one of the preceding Claims, wherein the at least one part has at least one slit.
15. A vacuum cleaner filter bag according to any one of the preceding Claims, wherein the vacuum cleaner filter bag is in the form of a flat bag with two rectangular filter material layers joined together along the edge and the material layer is connected, in particular centrally, with the filter material layer opposite the inlet opening of the vacuum cleaner filter bag, and is of rectangular shape with a width of 10 to 80 %, preferably 25 to 45 %, of the width of the filter material layer connected therewith, and/or a length of 60 to 100 %, preferably 100 %, of the length of the filter material layer of the vacuum cleaner filter bag connected therewith.
16. A vacuum cleaner filter bag according to any one of the preceding Claims, wherein the material layer comprises a laminate, in particular an SMS.
17. A vacuum cleaner filter bag according to any one of the preceding Claims, wherein the material layer comprises individual non-interconnected fibres or a sheet fibre network.
18. A vacuum cleaner filter bag according to Claim 17, wherein the directions of the longitudinal axes of the individual non-interconnected fibres form an angle of at least 45° with one another.
19. A vacuum cleaner filter bag according to Claim 17 or 18, wherein at least one part of the individual fibres is arranged adjacent with or without spacing from one another or overlapping one another.
20. A vacuum cleaner filter bag according to any one of Claims 17 to 19, wherein at least one part of the fibres is connected with the vacuum cleaner filter bag at both ends of the fibres in the longitudinal direction of the fibres.
21. A vacuum cleaner filter bag according to any one of Claims 17 to 20, wherein at least one part of the fibres is connected with the vacuum cleaner filter bag by one or more linear or areal connections.
22. A vacuum cleaner filter bag according to any one of Claims 17 to 21, wherein the material layer consists of individual non interconnected fibres.
23. A vacuum cleaner filter bag according to any one of the preceding Claims, further comprising an additional air-permeable material layer which is arranged inside the vacuum cleaner filter bag, which at at least one location is connected with the vacuum cleaner filter bag and/or the other air-permeable material layer, and which has at least one part which is not connected with the vacuum cleaner filter bag and/or the other air-permeable material layer, and includes one part of the edge of the material layer.
24. A vacuum cleaner filter bag according to any one of the preceding Claims, wherein the deflection device at least partly surrounds the inlet opening of the vacuum cleaner filter bag and is fastened to the inside of the bag.
25. A vacuum cleaner filter bag according to any one of the preceding Claims, wherein the deflection device is designed to divide the air flow into at least two split streams.
26. A vacuum cleaner filter bag according to any one of the preceding Claims, wherein the deflection device is designed to divide the air flow into at least two split streams with mutually opposed flow directions.
27. A vacuum cleaner filter bag according to any one of the preceding Claims, wherein the deflection device comprises at least one, preferably flat, deflection surface situated opposite the inlet opening.
28. A vacuum cleaner filter bag according to Claim 27, wherein the at least one deflection device has an equal or larger area than the area of the inlet opening.
29. A vacuum cleaner filter bag according to Claim 27 or 28, wherein the at least one deflection device is arranged at a predetermined angle relative to the plane of the inlet opening.
30. A vacuum cleaner filter bag according to any one of the preceding Claims, wherein the deflection device comprises the shape of a cylinder, truncated cone, rectangular solid or truncated pyramid, which in the top surface has an inlet opening and in the side wall has at least one outlet opening.
31. A vacuum cleaner filter bag according to any one of the preceding Claims, wherein the deflection device is designed so that in a first position it has, compared with a second position, a reduced extension perpendicular to the plane of the inlet opening.
32. A vacuum cleaner filter bag according to Claim 31, wherein the deflection device is designed so that it can be brought from the first position into the second position by a suction air flow.
33. A vacuum cleaner filter bag according to Claim 31 or 32, wherein the deflection device comprises a spring element which exerts a restoring force on to one part of the deflection device so that the deflection device can be brought from the second position into the first position depending on a suction air flow.
34. A vacuum cleaner filter bag according to any one of Claims 31 to 33, wherein the deflection device has fold lines so that the deflection device can be brought from the first or second position into the second or first position respectively.
35. A vacuum cleaner filter bag according to Claim 34, wherein the deflection device has the shape of a rectangular solid which in the top surface surrounding the inlet opening has an inflow opening and in a lateral surface has an outflow opening, wherein
    the outflow opening occupies the entire lateral surface and the fold lines are provided on the lateral edges perpendicular to the lateral surface of the outflow opening,
    the vacuum cleaner filter bag is in the form of a flat bag,
    the material layer is of quadrangular shape and is connected with the vacuum cleaner filter bag opposite the inlet opening, and
    the deflection device is arranged so that in the flat condition of the vacuum cleaner filter bag one of the fold lines forms an angle of at least 15° with an edge which is enclosed by the non-connected part.
36. A vacuum cleaner filter bag according to any one of the preceding Claims, wherein the deflection device comprises a substantially air-impermeable material, in particular a plastics material, a dry-laid or wet-laid non-woven fabric or paper, in particular paperboard, or a foil.
37. Use of a vacuum cleaner filter bag with an air-permeable material layer in a vacuum cleaner with a deflection device which is designed as part of nozzle for a vacuum cleaner, which further comprises a connecting device for connecting the deflection device to a connector nozzle which, in turn, connects the vacuum cleaner filter bag to a suction tube of the vacuum cleaner,
    wherein the connecting device and the deflection device are designed so that during operation of the vacuum cleaner the deflection device is arranged inside the vacuum cleaner filter bag, and in that an air flow entering the connecting device is deflected in the deflection device, and
    wherein the material layer is arranged inside the vacuum cleaner filter bag, at at least one location is connected with the vacuum cleaner filter bag and has at least one part which is not connected with the vacuum cleaner filter bag and includes a part of the edge of the material layer.
38. Use according to Claim 37, wherein the material layer has a smaller area than the area of the inside of the vacuum cleaner filter bag.
39. Use according to Claim 37 or 38, wherein the area of the at least one part constitutes at least 20 % of the area of the material layer.
40. Use according to any one of Claims 37 to 39, wherein a convex set is formed by the non-connected part on an upper surface of the material layer.
41. Use according to Claims 37 to 40, wherein the at least one part includes the projection point which results from a perpendicular projection of the geometrical centre of gravity of the material layer on the upper surface on one side of the material layer.
42. Use according to Claim 41, wherein the at least one part includes a course on the upper surface passing through the projection point, the end points of which each contact the edge of the material layer.
43. Use according to any one of Claims 37 to 42, wherein the at least one part includes at least 10 % of the edge of the material layer.
44. Use according to any one of Claims 37 to 43, wherein the material layer is of polygonal, in particular quadrangular shape, and the at least one part includes one part of at least two, in particular opposing, side edges of the material layer.
45. Use according to any one of Claims 37 to 44, wherein the material layer is connected with the vacuum cleaner filter bag at a predetermined number of points, in particular at exactly two points, and/or at two seams of the vacuum cleaner filter bag.
46. Use according to any one of Claims 37 to 45, wherein the material layer is of rectangular shape and is connected with the vacuum cleaner filter bag only along two, in particular opposing, side edges, in particular of the short sides.
47. Use according to any one of Claims 37 to 46, wherein the material of the material layer is a paper, a non-woven fabric, in particular comprising a melt blown, a spun bond, a wet-laid non-woven fabric and/or a dry-laid non-woven fabric, or an air-permeable sheet.
48. Use according to any one of Claims 37 to 47, wherein the material layer has an area of 10 to 80 %, preferably 15 to 30 %, of the area of the inside of the vacuum cleaner filter bag connected therewith.
49. Use according to any one of Claims 37 to 48, wherein the material layer is connected with the vacuum cleaner filter bag opposite the inlet opening of the vacuum cleaner filter bag.
50. Use according to any one of Claims 37 to 49, wherein the at least one part has at least one slit.
51. Use according to any one of Claims 37 to 50, wherein the vacuum cleaner filter bag is in the form of a flat bag with two rectangular filter material layers joined together along the edge and the material layer is connected, in particular centrally, with the filter material layer opposite the inlet opening of the vacuum cleaner filter bag, and is of rectangular shape with a width of 10 to 80 %, preferably 25 to 45 %, of the width of the filter material layer connected therewith, and/or a length of 60 to 100 %, preferably 100 %, of the length of the filter material layer of the vacuum cleaner filter bag connected therewith.
52. Use according to any one of Claims 37 to 51, wherein the material layer comprises at least one laminate, in particular an SMS.
53. Use according to any one of Claims 37 to 52, wherein the material layer comprises individual non-interconnected fibres or a sheet fibre network.
54. Use according to Claim 53, wherein the directions of the longitudinal axes of the individual non-interconnected fibres form an angle of at least 45° with one another.
55. Use according to Claim 53 or 54, wherein at least one part of the individual fibres is arranged adjacent with or without spacing from one another or overlapping one another.
56. Use according to any one of Claims 53 to 55, wherein at least one part of the fibres is connected with the vacuum cleaner filter bag at both ends of the fibres in the longitudinal direction of the fibres.
57. Use according to any one of Claims 53 to 56, wherein at least one part of the fibres is connected with the vacuum cleaner filter bag by one or more linear or areal connections.
58. Use according to any one of Claims 53 to 57, wherein the material layer consists of individual non-interconnected fibres.
59. Use according to any one of Claims 37 to 58, further comprising an additional air-permeable material layer which is arranged inside the vacuum cleaner filter bag, which at at least one location is connected with the vacuum cleaner filter bag and/or the other air-permeable material layer, and which has at least one part which is not connected with the vacuum cleaner filter bag and/or the other air-permeable material layer, and includes one part of the edge of the material layer.
60. Use according to any one of Claims 37 to 59, wherein the deflection device is designed to divide the air flow into at least two split streams.
61. Use according to any one of Claims 37 to 60, wherein the deflection device is designed to divide the air flow into at least two split streams with mutually opposed flow directions.
62. Use according to any one of Claims 37 to 61, wherein the deflection device comprises the shape of a cylinder, truncated cone, rectangular solid or truncated pyramid, which in the top surface has an inlet opening and in the side wall has at least one outlet opening.
63. Use according to any one of Claims 37 to 62, wherein the deflection device comprises at least one, preferably flat, deflection surface situated opposite the inlet opening.
64. Use according to Claim 63, wherein the at least one deflection device has an equal or larger area than the area of the inlet opening.
65. Use according to Claim 63 or 64, wherein the at least one deflection device is arranged at a predetermined angle relative to the plane of the inlet opening.
66. Use according to any one of Claims 63 to 65, wherein the deflection device comprises a substantially air-impermeable material, in particular a plastics material, a dry-laid or wet-laid non-woven fabric or paper, in particular paperboard, or a foil.

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