EP2098153A1 - Vacuum cleaner filter bag - Google Patents

Abstract

Vacuum filter bag (1) with a bag wall provided with an air inlet opening comprises an inner quadrilateral, especially rectangular material layer (5) that is completely connected to the bag wall on three side edges (6) and partially on the fourth edge so that during operation of the vacuum cleaner the upper side and under side of the material layer stand at least partly away from the bag wall. Preferred Features: The material layer is a flexible material, especially a filter paper, a fleece, especially an extrusion fleece or an air-permeable foil. The filter bag is a flat bag.

Description

The invention relates to a vacuum cleaner filter bag.

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, at the same time a high suction power of the vacuum cleaner is sought over this time. To achieve this goal, various approaches are known from the prior art.

In order to avoid clogging of the bag wall forming filter material over a longer period, discloses EP 0 960 945 a multilayer bag wall construction in which a coarse filter layer is arranged in front of a fine filter layer in the direction of air flow.

From the WO 2007/059939 a vacuum cleaner filter bag is known, which has in its interior a deflection device arranged in the region of the inlet opening for deflecting the air flow entering through the inlet opening. Furthermore, an air-permeable material layer is provided in the interior of the filter bag, which is unconnected to at least a part of the edge with the filter bag.

The object of the present invention is to further improve the filter bags known from the prior art, so that a high service life is possible with high suction power. This object is achieved by a vacuum cleaner filter bag according to claim 1.

According to the invention, a vacuum cleaner filter bag is provided, comprising
a bag wall of filter material, wherein an inlet opening is provided in the bag wall,
a deflection strip for deflecting an air flow entering through the inlet opening, the deflection strip being arranged inside the vacuum cleaner filter bag,
a strip of material disposed in the interior of the vacuum cleaner filter bag and connected to the bag wall, at least a portion of the edge of the strip of material being unconnected to the bag wall, and
a spacer means formed such that the strip of material is at least partially spaced from the bag wall during operation of the vacuum cleaner filter bag.

It has surprisingly been found that such an arrangement of a deflection strip, a material strip and a spacing means allow a high suction power over a long period of time. The deflection strip ensures that an incoming air flow does not strike the strip of material directly. Due to the spacing means, an air flow can flow to the side of the strip of material facing away from the inlet opening. The strip of material thus moves in the air flow, which has an advantageous distribution of the dust in the bag interior result.

The spacing means may in particular be designed in such a way that the strip of material with its side facing away from the inlet opening is at least partially spaced from the bag wall. In particular, it may be spaced from the bag wall opposite the inlet opening. Furthermore, the material strip to be completely spaced apart from the bag wall to joints with the bag wall.

The spacing means may comprise a piece of material which is provided on the side of the material strip facing away from the inlet opening. In particular, the spacing means may be formed in the form of the piece of material.

Thus, the invention provides a vacuum cleaner filter bag comprising a bag wall of filter material, wherein an inlet opening is provided in the bag wall, a deflecting strip for deflecting an air stream entering through the inlet opening, the deflecting strip being disposed inside the vacuum cleaner filter bag, a strip of material inside the vacuum cleaner filter bag are arranged and connected to the bag wall, wherein at least a part of the edge of the strip of material with the bag wall is unconnected, and a piece of material which is provided on the side facing away from the inlet opening of the strip of material.

The piece of material may in particular be designed such that an air flow is thereby guided on the side of the material strip facing away from the inlet opening. The piece of material carries an air flow on the side of the material strip facing away from the inlet opening (ie behind the strip) in the direction of the material strip. Thus, the strip of material is lifted in a simple manner by the air flow and spaced from the bag wall. He can move very well in the air flow, which has an advantageous distribution of the dust in the bag inside result. The piece of material may in principle be at least partially connected to the strip of material; but it can not be connected to the strip of material.

In particular, the deflection strip 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 deflection strip can be designed to split the air flow into at least two partial flows with different, in particular opposite, flow directions. In operation of the vacuum cleaner filter bag, air enters the flow direction (inlet flow direction) through the inlet port and strikes the deflection strip. By this, the air flow is deflected, so that a change in the flow direction through the deflection strip 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.

Opposite directions of flow means that both directions of flow have a component in the plane perpendicular to the flow direction with which an air stream strikes the deflection strip, ie a component perpendicular to the inlet flow direction, the two components enclosing an angle of about 180 ° and the components in each case are larger than the corresponding one 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 material strip can be arranged in particular on the inside of the vacuum cleaner filter bag on the side of the deflection strip facing away from the inlet opening. Seen from the inlet opening then the strip of material behind the deflection strip and the piece of material behind the strip of material. In particular, the material strip and / or the piece of material may lie opposite the inlet opening.

The bag wall may comprise two wall pieces of filter material, wherein the inlet opening is provided in a first wall piece. The deflection strip may be connected to the first wall piece and / or to the second wall piece. The material strip and / or the piece of material may in particular be connected to the second wall piece. The strip of material may also be connected to the first wall piece. The second wall piece may face the inlet opening. In particular, in a vacuum cleaner filter bag in flat shape, the two wall pieces may be separate pieces of filter material, which are interconnected. In a vacuum cleaner filter bag having a block or block bottom shape, the two wall pieces may be part of a continuous piece of filter material, the two wall pieces being defined by the gussets on the two sides of the block bottom bag.

The vacuum cleaner filter bag may further comprise a holding plate for holding the vacuum cleaner filter bag in a vacuum cleaner housing. The deflection strip may be connected to the retaining plate.

The deflection strip, the material strip and / or the piece of material may have a smaller area than that of the bag wall. This allows a deflection of the air flow and a movement of the two strips in an advantageous manner. For example, the deflection strip, the material strip and / or the piece of material may have a smaller area than one of the wall pieces.

The material strip and / or the piece of material may extend over the entire length of the bag wall, in particular of the second wall piece. The width of the material strip and / or the piece of material may also be less than the width of the bag wall, in particular of the second wall piece, be. The width may in particular be at most two thirds, preferably at most half the width of the bag wall, in particular of the second wall piece.

The material of the piece of material may have a lower air permeability than the material of the bag wall and / or the material strip. Thus, an air flow from the rear (ie on the side facing away from the inlet opening) is advantageously guided in the direction of the material strip and thus makes it possible to lift it from the bag wall and to space it.

The material of the material piece can (s m ²⁾ (s m ²⁾ (s ² m) having an air permeability of less than 2000 I /, more preferably less 1000 l /, in particular less than 500 l /.

In the previously described vacuum cleaner filter bags, the piece of material may be disposed inside the vacuum cleaner filter bag or outside the vacuum cleaner filter bag or may be formed as part of the bag wall. In particular, both in an arrangement inside and outside the piece of material may be connected to the bag wall. In an arrangement inside or outside the piece of material is thus formed as separate or separate from the bag wall element. The piece of material may additionally or alternatively be connected to the strip of material.

According to one possibility, the piece of material may be arranged in the interior of the vacuum cleaner filter bag and connected to the bag wall, wherein the piece of material is arranged such that the strip of material is kept with its side facing away from the inlet opening at least partially spaced from the bag wall. The spacing allows a simple way of guiding the air flow under the strip of material.

The piece of material may be formed such that the strip of material is kept at least partially spaced apart by at least 0.1 mm, preferably at least 1.5 mm, more preferably at least 4 mm, from the bag wall, in particular the second wall piece. The piece of material can therefore in particular have a thickness of at least 0.1 mm, preferably at least 1.5 mm, more preferably at least 4 mm. The spacing and thus the thickness can reach up to several centimeters.

The material strip and / or the piece of material may be formed in particular rectangular. The strip of material and / or the piece of material may be parallel to the side edges the bag wall, in particular the second wall piece to be aligned. In particular, the two longitudinal sides of the material strip and / or of the piece of material may be spaced from the corresponding (parallel) side edges of the bag wall or the second wall piece, for example centrally with respect to the width of the second wall piece.

The piece of material may be in the form of a strip. The material strip and the piece of material can be arranged one above the other or one above the other; In this case, the piece of material is arranged inside the vacuum cleaner filter bag. In particular, in the case of a strip-shaped piece of material, the two strips lie flat against one another in this way. Alternatively, the strip-shaped piece of material can also be fastened outside on the bag wall. This also makes it possible to achieve an air deflection from behind on the strip of material, since the air permeability is reduced overall in this area of the bag wall.

The piece of material and the strip of material may have the same width and / or length. Alternatively, they may have a different width and / or length. In particular, the strip of material may have a greater length and / or width than the piece of material.

The deflection strip, the material strip and / or the piece of material can be rectangular; they can, in particular if they are formed as strips, in each case along two opposite edges, in particular along the short edges, be connected to the bag wall. In particular, the deflection strip, the material strip and / or the piece of material can be connected to the bag wall only at these locations, that is, at two edges or edges. However, the strip of material may also be connected at these locations with the deflection strip.

Alternatively or in addition to the piece of material, the spacing means may comprise a connecting device, via which the material strip is connected to the bag wall and / or the deflection strip. The invention thus also provides a vacuum cleaner filter bag comprising a bag wall of filter material, wherein an inlet opening is provided in the bag wall, a deflecting strip for deflecting an air stream entering through the inlet opening, the deflecting strip being disposed inside the vacuum cleaner filter bag, a strip of material disposed in the bag Are arranged inside the vacuum cleaner filter bag and connected to the bag wall, wherein at least part of the edge of the strip of material is unconnected to the bag wall, and connecting means by which the strip of material is connected to the bag wall and / or the deflecting strip in the said manner.

It has been found that a high suction power over a long period of time is also made possible by a suitable connection of the material strip with the bag wall and / or the deflection strip. The piece of material is not absolutely necessary in this case. Due to the connecting device, an air flow can flow to the side of the material strip facing away from the inlet opening. The strip of material thus moves in the air flow, which has an advantageous distribution of the dust in the bag interior result.

The spacing means may in particular consist of the piece of material and / or the connecting device. The connecting device may comprise at least one splice and / or a weld. In this way, the material strip can advantageously be connected to the bag wall and / or the deflection strip. The at least one splice and the at least one weld may be formed, for example, in the form of one or more adhesive or welding points or linear.

If, for example, the strip of material is rectangular, it can, in particular if it is designed as a strip, be connected along two opposite edges, in particular along the short edges, to the bag wall and / or to the deflection strip. The connection with the bag wall may in particular be at the hem or with the wall piece in which the inlet opening is provided. In addition, the strip of material may then be connected, for example glued or welded, to the deflection strip and / or the bag wall, in particular to the wall piece in which the inlet opening is provided.

In the previously described vacuum cleaner filter bags, the bag wall may have a seam and the strip of material and / or the piece of material at the seam may be connected to the bag wall (in particular if the piece of material is formed as a separate element from the bag wall). In particular, a first wall piece and a second wall piece can be connected to one another via a seam and the material strip and / or the piece of material at the seam can be connected to the second wall piece. This simplifies in particular the production of the vacuum cleaner filter bag and allows the material strip and / or the piece of material over the entire length of the second wall piece form. The seam can be formed by a connecting seam, for example by a welded or adhesive seam.

Alternatively, the material strip and / or the piece of material can also be connected to the bag wall at a distance from the seam.

The deflection strip may have a shorter length than the length of the bag wall or the first wall piece. Alternatively, however, the deflection strip may extend over the entire length of the bag wall or the first wall piece. The piece of material may have a smaller area than the strip of material. In particular, the piece of material may have a smaller width and / or a shorter length than the strip of material. Alternatively, however, the piece of material can also protrude over the strip of material in one or both dimensions, in particular be made larger in one or both dimensions.

The deflection strip, the material strip and / or the piece of material may have a width that is greater than the diameter of the inlet opening. The width of the deflection strip may be less than the width of the material strip and / or the piece of material.

In the previously described vacuum cleaner filter bags, the deflection strip, the material strip and / or the piece of material may be slotted, in particular have a plurality of slots. In this way, each sub-strips are formed, which are optionally relatively independently movable. The slitting of the piece of material is particularly advantageous for separate pieces of material. In particular, four to ten slots can be provided. The slots can be the same distance. In particular, partial strips can be formed through the slits whose width is 0.3 cm to 3.5 cm, in particular 0.5 cm to 1.5 cm. In particular, the slots may be spaced apart from each other by said dimensions.

The slots may each be formed parallel to a side edge of the deflection strip, the material strip or the spacer element. In particular, the slots may be formed parallel to a respective longitudinal edge.

One or more slots may each extend substantially the entire length of the deflection strip, the strip of material or the piece of material and / or the entire length between two connection points. In particular, all slots can extend over the entire length. This would be the partial strips on the extend the entire length of the deflection strip or the respective strip. The connection points are the locations at which the deflection strip, the material strip and / or the piece of material are connected to the bag wall, that is, for example, the connection seams at the short edges.

The connection of the deflection strip, the material strip and / or the piece of material with the bag wall and / or a holding plate can be effected in particular by gluing or welding. The deflection strip, the material strip and / or the piece of material can be glued or welded pointwise or linearly with the bag wall or the holding plate. For example, the strips may be formed rectangular and connected at their short edges pointwise or line with the bag wall. However, the piece of material can also be glued or welded to the entire surface of the bag wall.

In the previously described vacuum cleaner filter bags, the deflecting strip may comprise or consist of an air-permeable or an air-impermeable material. The baffle may comprise a nonwoven fabric, particularly an extrusion nonwoven such as a spunbond nonwoven or a spunbond fabric, a nonwoven web, a wet laid web and / or a dry laid web, a paper, a paperboard , a net, a woven fabric and / or a foil, for example perforated. The deflection strip may comprise or consist of a laminate of a plurality of said layers. The basis weight of the deflection strip can range from 10 g / m ² to 300 g / m ² , in particular from 50 to 200 g / m ² .

The strip of material and / or the piece of material may comprise a nonwoven, in particular an extrusion nonwoven, such as a spunbond nonwoven or a spunbond nonwoven, a wet laid nonwoven and / or a dry laid web, a paper, a net, a woven fabric and / or a perforated film. The deflection strip and / or the piece of material may comprise or consist of a laminate of a plurality of said layers. For example, the strip of material and / or the piece of material may comprise a composite of two filament spunbonded fabric layers, between which a drained nonwoven fabric of staple fibers is arranged. The structure can, for example, as in the DE 10 2005 059 214 be described. The piece of material may in particular also comprise a cardboard. The basis weight of the material strip and / or the piece of material may be from 20 g / m ² to 300 g / m ² , in particular from 80 to 200 g / m ² , rich. The air permeability of the strip of material may range from 100 to 10,000 l / (m ² s), in particular from 500 to 3,000 l / (m ² s).

The piece of material can also be formed by a treatment, in particular by solidification, of the bag wall. Thus, the piece of material is then not designed as a separate element. In particular, a region of the entire bag wall or a region of one or more layers of the bag wall can be solidified. The solidification can be achieved for example by a full-scale thermal calendering. This reduces the air permeability in this area compared to the surrounding area.

The vacuum cleaner filter bags described above may be disposable bags. In particular, they can be designed as flat bags. In particular, these may consist of two rectangular wall pieces, which are interconnected along their edges, for example, welded or glued, are. On each of two opposite sides of the vacuum cleaner filter bag, one side fold can be introduced in each case. On the first wall piece may be arranged at the inlet opening, a holding plate for holding the vacuum cleaner filter bag in a vacuum cleaner housing.

Fig. 1

eine schematische Querschnittsansicht eines Beispiels eines Staubsaugerfilterbeutels;

Fig. 2

eine schematische Draufsicht auf ein Beispiel eines ersten Wandstücks;

Fig. 3

eine schematische Draufsicht auf ein Beispiel eines zweiten Wandstücks;

Fig. 4

eine schematische Querschnittsansicht eines weiteren Beispiels eines Staubsaugerfilterbeutels;

Fig. 5

eine schematische Querschnittsansicht eines weiteren Beispiels eines Staubsaugerfilterbeutels;

Fig. 6

Vergleichsmessungen für verschiedene Staubsaugerfilterbeutel.

Further features and advantages of the invention will be explained below with reference to the exemplary figures. Showing:

Fig. 1

a schematic cross-sectional view of an example of a vacuum cleaner filter bag;

Fig. 2

a schematic plan view of an example of a first wall piece;

Fig. 3

a schematic plan view of an example of a second wall piece;

Fig. 4

a schematic cross-sectional view of another example of a vacuum cleaner filter bag;

Fig. 5

a schematic cross-sectional view of another example of a vacuum cleaner filter bag;

Fig. 6

Comparative measurements for different vacuum cleaner filter bags.

In Fig. 1 schematically a cross-sectional view of a vacuum cleaner filter bag 1 is shown. The vacuum cleaner filter bag is constructed in the form of a flat bag. It consists of a first rectangular wall piece 2 and a second rectangular wall piece 3, which are each constructed of one or more layers of filter material. For example, each wall piece may consist of a multilayer composite comprising one or more nonwoven fabric layers and / or one or more nonwovens. Thus, between two extrusion nonwoven layers, z. In the form of a spunbond nonwoven fabric or a filament spunbond nonwoven fabric, a nonwoven layer of staple fibers which is solidified by means of calendering between the nonwoven fabric layers.

The term "nonwoven" is used as defined in ISO standard I-SO 9092: 1988 or CEN standard EN 29092. A nonwoven fabric may be dry or wet laid in particular, or an extrusion void, for example a spunbond nonwoven fabric (melt spunbonded) Microfiber non-woven fabric, "meltblown nonwoven", the nomenclature is according to Albrecht et al., Nonwovens, Wiley-VCH, 2000, see, for example, p. 186 ) or spunbond nonwoven (spunbond nonwoven). The distinction between wet laid nonwovens and conventional wet laid paper is as defined above, as used by the International Association Serving The Nonwovens and Related Industries EDANA (www.edana.org). When referring to paper or filter paper, it is meant (conventional) wet laid paper which is excluded in the above definition of nonwoven fabric. By a web ("Web") is meant a layer of still loose, ie unconnected, fibers. By solidifying the loose fibers, a nonwoven fabric can be obtained.

For the measurements of the various parameters, the following methods were used. The basis weight was determined according to DIN EN ISO 9073-1. The thickness of the materials was determined according to DIN EN ISO 9073-2 (method A). The air permeability was determined according to EN ISO 9237 with an area of 20 cm ² and a differential pressure of 200 Pa.

The two wall pieces may for example have a structure as described in European Patent Application No. 07 013 312.9. This advantageously makes it possible to provide a disposable bag.

To produce a flat bag, the two rectangular wall pieces are stacked and joined together along its edge, so that a seam 4 is formed by the peripheral seam. It may be, for example, an adhesive or weld.

The first wall piece 2 has an inlet opening 5, through which an air stream enters the vacuum cleaner filter bag during operation of the vacuum cleaner filter bag. On the outside of the wall piece, a holding plate 6 is fastened in the region of the inlet opening and serves to hold the vacuum cleaner filter bag inside a vacuum cleaner. Such a holding plate can be glued or welded, for example, with the filter material of the wall piece.

In the interior of the vacuum cleaner filter bag, a deflection strip 7 is arranged on the first wall piece 2. The strip in the example shown is rectangular and connected along the two short edges (perpendicular to the plane of the drawing) with the filter material of the first wall piece, for example glued or welded. With the exception of the two connecting seams along the short edges, the deflecting strip 7 is loose, i. H. not connected to the bag wall. In particular, no seam is provided along the long edges. Alternatively, the deflection strip can also be connected to the holding plate and / or the second wall piece (at least along one edge).

In the example shown, the deflection strip 7 is arranged in the region of the inlet opening 5, ie does not extend over the entire length of the first wall piece 2. It may have a length of 20 cm and a width of 7 cm. The arrangement of the deflector strip with respect to the inlet opening may be asymmetrical (as in the example shown) or symmetrical. The dimensions of the deflection strip 7 may be selected such that the inlet opening 5 is covered.

In principle, the deflection strip 7 may consist of an air-impermeable or air-permeable material. It can be single or multi-layered. For example, the deflecting strip 7 may consist of a filament spunbonded nonwoven layer joined to an (air impermeable) film. The deflection strip can have a basis weight of 150 g / m ² .

In the interior of the vacuum cleaner filter bag, a material strip 9 and a spacing means are furthermore arranged. The spacer is a strip-shaped piece of material 8 trained. The material strip 9 and the piece of material 8 are both connected to the second wall piece 3. In this way, the material strip 9 and the piece of material 8 are arranged on the side opposite the inlet opening 5 side of the vacuum cleaner filter bag. As can be seen in particular from the examples described below, neither the strip of material nor the piece of material must be connected on one or both sides with the second wall piece; For example, a connection with each other and / or with the first wall piece is also possible.

The piece of material can for example also be folded or pleated. The piece of material does not have to be strip-shaped. It may, for example, also be a piece of cardboard that has a fold structure such that a spacing of the material strip is achieved by a desired amount. Furthermore, the piece of material can also be fastened in the same way on the outside of the bag wall. According to a further alternative, the piece of material can also be obtained by solidification of a region of the bag wall.

In the example shown, the strip of material extends over the entire length of the second wall piece 3; the piece of material is shorter. For example, the strip of material may have a length of 26 cm, which corresponds to the length of the wall piece, and a width of 11 cm. The piece of material may have a length of 22 cm and a width of 8 cm. Furthermore, the piece of material 8 under the strip of material 9, ie between the strip of material and bag wall, arranged.

It has been found that, for example, pieces of material with other dimensions also show very good results. For example, a 80 x 40 mm size film disposed transverse to the material strip underneath and connected to the bag wall at each of four corners via a weld point may also be used.

In the example shown, the connection of the material strip with the second wall piece is realized in that the material strip extend into the seam 4 and are connected via the connection of the seam (for example a welded or glued seam) to the second wall piece and also to the first wall piece , The strip-shaped piece of material is glued or welded to the second wall piece. In particular, the piece of material can be glued or welded either point or line shape from the full surface with the bag wall. Alternatively to the variant shown, the Material strip also connected on one or both sides not on the hem with the bag wall but directly connected to the first wall piece 2 at spaced locations from the hem, for example, glued or welded. In this case, the material strip advantageously does not extend over the entire length of the first or second wall piece.

The two strips can, but need not, be the same. They may differ in particular in the dimensions, materials, air permeabilities and / or basis weights. Preferably, however, both strips have a width that is greater than the diameter of the inlet opening 5.

Thus, for example, the material strip and the piece of material may have two cover nonwovens in the form of a filament spunbonded nonwoven fabric, between which a web of loose fibers (in particular Crimpfasem) is arranged, which is connected by means of calendering with the Filamentspinnvliesstofflagen. The basis weight of the strip of material and the piece of material may in the example be between 100 and 200 g / m ² ; The thickness of both strips can be 3 - 4 mm. The air permeability of the piece of material is preferably below 2000 l / (m ² s). Alternatively, the piece of material may also be formed in the form of a film, which may be impermeable to air or perforated, for example. Such a film may have a thickness of, for example, 0.1 mm.

In operation, airflow enters the vacuum cleaner filter bag through inlet port 5 and is deflected by deflector strip 7. Depending on the design and arrangement of the deflection strip, the incoming air flow is divided in particular into two partial flows with different flow directions.

Due to the deflection, the air can in particular flow under and between the two strips and set them in motion, so that the sucked-in dust can be distributed evenly inside the vacuum cleaner filter bag.

The piece of material can be arranged symmetrically with respect to the inlet opening and / or the bag wall, in particular of the second wall piece (ie with the same spacing in the width and / or the length from the edge of the bag). Alternatively, the arrangement may also be asymmetrical with respect to the inlet opening and / or the bag wall, in particular the second wall piece.

In Fig. 2 schematically a plan view (from the interior of the vacuum cleaner filter bag) to an example of a first wall piece 2 is shown. The inlet opening 5 is drawn in dashed lines. Covering the inlet opening 5, a deflection strip 7 is connected to the first wall piece 2. In particular, this connection can take place via welded or adhesive seams along the short edges of the deflection strip. Otherwise, the deflection strip is unconnected, ie loose.

The deflection strip 7 has a rectangular shape and is arranged parallel to but spaced from the edges of the first wall piece.

In principle, the deflection strip can be a continuous strip. Alternatively, however, as in the example shown, slots 10 may be provided in the deflection strip. In this way, the deflection strip then consists of several partial strips, in the example shown, consisting of five partial strips.

In the example shown, the slots extend over the entire length of the deflection strip, or over the entire length between the two connecting seams at the short edges. Alternatively, however, a part of the slots or all slots may be formed shorter than the length of the deflection strip. In the example shown, the slots are arranged parallel to the longitudinal side of the deflection strip. Again, other orientations of the slots are alternatively possible. The slots allow different portions of the deflection strip to be relatively independently movable. Furthermore, air can flow through the slots relatively unhindered, so that the expression of the two partial flows is somewhat reduced.

In Fig. 3 is a plan view of the inside of a second wall piece 3 shown schematically. This page is in the prefabricated vacuum cleaner filter bag in Fig. 2 shown side and thus the inlet opening opposite. With the second wall piece 3, a strip of material 9 is connected, which is arranged over a strip-shaped piece of material, the latter can not be seen in this plan view. The material strip 9 extends over the entire length of the second wall piece 3, but it has a smaller width; In particular he may be related to FIG. 1 have mentioned dimensions. Alternatively, however, the material strip may also have a shorter length than the length of the second wall piece.

The material strip 9 is connected to the second wall piece via the peripheral seam of the vacuum cleaner filter bag. In principle, the material strip 9 may consist of a continuous piece of material. Alternatively, however, as in the example shown, the strip 9 may have slots 11 formed by the partial strips, in the example shown four partial strips. In the example shown, the slots extend the full length of the strip. Alternatively, however, the slots may be shorter or have a different orientation. The partial strips may have, for example, a width of 12.5 mm.

The strip-shaped piece of material has in the example a smaller length and width than the strip of material and is thus covered by this. The strip-shaped piece of material can also be slotted.

Furthermore, it is possible, but not required, that the material strip and the strip-shaped material piece each have slots of the same type (orientation, length, width, etc.). For example, one of the two strips may have slots over the entire length and the other strip may only have shorter slots or none at all. Furthermore, the slots in the strip of material and in the strip-shaped piece of material can be arranged offset or offset from one another. In the former case, this means that the projection of the slits of the strip of material on the piece of material lie on the slots of the piece of material. In the latter case, the projection of the slots would be offset from the slots of the piece of material itself.

Basically, the deflection strip may, but need not completely, cover the inlet opening. The (geometric) center of gravity of the deflection strip may be displaced with respect to the center (or a straight line perpendicular to the plane of the inlet opening and passing through the center thereof) of the inlet opening. Furthermore, the material strip and / or the piece of material can also be displaced relative to one another and / or with respect to the inlet opening. In particular, the centers of gravity of the deflection strip, of the material strip and / or of the piece of material can be displaced relative to one another and / or with respect to the center of the inlet opening.

At the in FIG. 4 In the exemplary embodiment shown, the spacing means consists of a connection point 12 between the material strip 9 and the deflection strip 7. This connection point 12 may be a point- or line-shaped adhesive or welding point. In this example, the deflection strip is as in the case of FIG. 1 formed, even if other dimensions and arrangements on the first wall piece 2 are possible.

The material strip 9 is connected at the left edge over the seam 4 with the first and the second wall piece. At its right edge, the strip of material is connected to the first wall piece (for example glued or welded), this connection lying at a position spaced from the seam. In addition, a connection with the deflection strip 7, in order to keep the strip of material in the operation of the vacuum cleaner filter bag from the bag wall, in particular from the second wall piece 3, spaced. In this case, an additional piece of material, such as the piece of material 8 in FIG FIG. 1 , not mandatory. However, such can nevertheless be provided, in particular in order to further promote lifting of the strip of material and to reinforce it.

To the example shown in FIG. 4 Various modifications are possible. For example, two spaced connection points of the material strip 9 may be provided with the deflection strip 7. In particular, the strip of material may be connected to the deflection strip at the locations where the deflection strip is connected to the bag wall. For this purpose, a continuous weld of bag wall, deflection strips and strips of material could be formed. If the strip of material is connected in particular at two points with the deflection strip, the strip of material no longer has to extend beyond the deflection strip. This then gives a kind of doubling of the deflection strip. Further connections of the material strip with the bag wall are not required. In particular, in this case, slots in the deflection strip and strips of material, in particular in mutually offset form, advantageous.

As another alternative to the in FIG. 4 In the variant shown, the connection on the right side of the material strip can also be made via the hem on the right side of the bag.

In FIG. 5 the spacer means consists of both the piece of material 8 and the connection point 12, wherein in this example the piece of material is optional. The piece of material may in particular as associated with FIG. 1 be described described. The material strip 9 is connected on the one hand on both sides via the seam 4 with the bag wall. On the other hand, an adhesive or weld 12 is provided, so that the material strip 9 is additionally connected to the first wall piece 2.

In FIG. 6 Comparative measurements for different vacuum cleaner filter bag configurations are shown. A dust load test with DMT dust (Type 8) according to EN 60312 (Draft 4th edition) was carried out. The vacuum cleaner used is a Miele S 712 SAC. The standard engine protection filter and the standard exhaust filter were used. The basis for the investigations are the vacuum cleaner filter bags F / J / N series (batch 56 12.14) available from Wolf GmbH & Co. KG. The dimensions of this flat bag are 290 x 260 mm.

At the in FIG. 6 with "F / J / N series batch 56 12.14" designated measurement, this vacuum cleaner filter bag was examined without further modification. "290 x 260 - SR 1 + SR 2/12" refers to the same bag, but in modified form. In this bag, a deflection strip ("SR 1") with dimensions of 200 x 70 mm was used. This deflection strip extends from the hem of the filter bag via the inlet opening and is welded to the bag wall at its short edges (on one side of the bag mouth). The deflection strip consists of a filament spunbonded nonwoven layer (150 g / m ² ), which is fully bonded to a film.

Furthermore, in this variant, a material strip ("SR 2") is provided, which has a size of 260 x 110 mm and is thus attached to both short edges on the hem. This strip of material has 9 continuous slots with a width of about 12 mm. There are two Filamentspinnvliesstofflagen between which a layer Crimpfasem is arranged. The total thickness of the strip of material is about 4 mm. For a bag modified in this way, a dust volume of 400 g results in a substantially improved volume flow.

Next ("290 x 260 - SR 1 + SR 2/12 + SR3 / 12.5") again the same vacuum cleaner bag was used, also with the already mentioned deflection strips and strips of material. In addition, a piece of material ("SR3") is provided. The piece of material has the dimensions 220 x 80 mm and is made of the same material as the material strip. The piece of material is arranged symmetrically with respect to the inlet opening and the second wall piece. The piece of material has 6 continuous strips with a width of about 12.5 mm. "290 x 260 - SR 1 + SR 2/12 + SR3 / 12.5 SB" again refers to the same vacuum cleaner bag with the aforementioned deflection strips and strips of material. Here, the piece of material in the form of a filament spunbonded fabric is provided, which is about 0.2 mm thick.

For "290 x 260 - SR 1 + SR 2/12 + Support", the piece of material is in the form of a (unslotted) strip 2cm wide and the same length as the strip of material. The piece of material again has the same material as the strip of material (see above).

"290 x 260 - SR 1 + SR 2/12 + Support film" refers to a bag as in the previous examples, where the piece of material is a form of a 40 x 80 mm PP film, which is transverse to the strip of material in the middle the second wall piece is arranged; the longitudinal dimension of the strip of material is thus perpendicular to the longitudinal dimension of the piece of material.

From these examples, it can be seen that a piece of material with which the air is directed from the back to the strip of material significantly improves the volume flow even with a dust load of 400 g compared to a conventional vacuum cleaner bag. The same applies in a corresponding manner if, instead of the piece of material, a connecting device, for example an additional adhesive or welding point, is used in order to keep the strip of material spaced from the bag wall during operation.

Claims (16)

Vacuum cleaner filter bag (1) with
a bag wall made of filter material, wherein an inlet opening is provided in the bag wall,
a deflecting strip (7) for deflecting an air stream entering through the inlet opening, the deflecting strip being arranged inside the vacuum cleaner filter bag,
a strip of material (9) disposed in the interior of the vacuum cleaner filter bag and connected to the bag wall, at least a portion of the edge of the strip of material being unconnected to the bag wall, and
a spacer means (8; 12) formed such that the strip of material is at least partially spaced from the bag wall during operation of the vacuum cleaner filter bag. Vacuum cleaner filter bag according to claim 1, wherein the spacing means comprises a piece of material (9) which is provided on the side facing away from the inlet opening of the material strip. Vacuum cleaner filter bag according to claim 2, wherein the material of the piece of material has a lower air permeability than the material of the bag wall and / or the material strip. Vacuum cleaner filter bag according to one of the preceding claims, wherein the piece of material is arranged inside the vacuum cleaner filter bag or outside of the vacuum cleaner filter bag or is formed as part of the bag wall. Vacuum cleaner filter bag according to one of the preceding claims, wherein the piece of material is connected to the bag wall and / or the strip of material. A vacuum cleaner filter bag according to any one of the preceding claims, wherein the piece of material is disposed inside the vacuum cleaner filter bag and connected to the bag wall, the piece of material being arranged such that the Material strip is held with its side facing away from the inlet opening at least partially spaced from the bag wall. Vacuum cleaner filter bag according to one of the preceding claims, wherein the piece of material is designed in the form of a strip. Vacuum cleaner filter bag according to one of the preceding claims, wherein the material strip and / or the piece of material extend over the entire length of the bag wall. Vacuum cleaner filter bag according to one of the preceding claims, wherein the spacing means comprises a connecting means (12) via which the strip of material is connected to the bag wall and / or the deflection strip. Vacuum cleaner filter bag according to claim 9, wherein the connecting device comprises at least one splice and / or weld. Vacuum cleaner filter bag according to one of the preceding claims, wherein the bag wall has a seam (4) and the material strip and / or the piece of material are connected to the hem with the bag wall. Vacuum cleaner filter bag according to one of the preceding claims, wherein the deflection strip has a smaller length than the length of the bag wall and / or a smaller width than the width of the bag wall. Vacuum cleaner filter bag according to one of the preceding claims, wherein the deflection strip, the material strip and / or the piece of material have a width which is greater than the diameter of the inlet opening. Vacuum cleaner filter bag according to one of the preceding claims, wherein the width of the deflection strip is smaller than the width of the material strip and / or the piece of material. Vacuum cleaner filter bag according to one of the preceding claims, wherein the deflection strip, the material strip and / or the piece of material are slotted, in particular have a plurality of slots. Vacuum cleaner filter bag according to one of the preceding claims, wherein the piece of material is formed by a treatment, in particular by a solidification, the bag wall.

Images