EP2465397B1 - Vacuum cleaner bag and method for manufacturing same - Google Patents

Description

The present invention relates to a vacuum cleaner bag having at least one inwardly folded wall portion which is held in at least one holding means in the inwardly folded position.

The DE 20 2008 016 300 discloses a vacuum cleaner bag in which an inwardly directed fold is arranged on one side. In operation, this fold may inflate outwardly, thus significantly increasing the internal volume of the vacuum cleaner bag. A disadvantage of such inwardly folded wall sections that they inflate during operation and press outwards, so that the filter material presses against the inner wall of the dust chamber of the vacuum cleaner and in large areas, a flow of air is difficult to be prevented. This deteriorates the suction power. If the inwardly folded wall section remains folded in, the suction performance is likewise impaired since the filter material is not or only insignificantly flows through in the region of the fold.

The EP 2 198 765 discloses a vacuum cleaner bag in the form of a block bottom bag, in which a spacer is provided in an interior, which limits the distance between two side walls to each other, to avoid uncontrolled inflation of the vacuum cleaner bag.

It is therefore an object of the present invention to provide a vacuum cleaner bag, in which the effective filter surface is better used and has a long life.

This object is achieved by a vacuum cleaner bag with the features of claim 1.

In the vacuum cleaner bag according to the invention, the inwardly folded wall section is held in the inwardly folded position via at least one retaining means. This avoids that the inwardly folded wall portion inflates outwardly and applies against the inner wall of a chamber of a vacuum cleaner bag, so that the voltage applied to the wall area is not traversed with air. Rather, the inwardly folded wall portion is held substantially in a permeable position, wherein at least inflation to the outside is prevented. A certain elasticity of the holding means does not impair this function. In addition, it is ensured that the inwardly folded wall portion is available as a filter surface and thus the filter area in relation to the internal volume of the vacuum cleaner bag is significantly higher than without inwardly folded wall portion.

The holding means has at least one recess or is formed from a net or grid. This ensures that the holding agent can be flowed through and does not adversely affect the suction power. The recess in the holding means is preferably arranged laterally offset from an inflow opening in the upper part or the lower part, so that the holding means also acts as an impact protection and deflects an incoming air flow. The size of the recess is preferably greater than 2 cm ² , in particular larger than the inflow opening. The geometry of the recess is freely selectable and also several recesses may be incorporated into the retaining means.

Preferably, the holding means is fixed at least in a central region of the wall portion. The inwardly folded wall portion may be fixed over the entire length by the holding means, but for the function of holding the inwardly folded portion to prevent inflation, however, it suffices if the inwardly folded wall portion at one or more points on the Hattemittel is fixed. However, a fixation on the holding means is particularly useful in the central region, since the inwardly folded wall portion is preferably also fixed to a seam of the vacuum cleaner bag edge.

According to a preferred embodiment, the vacuum cleaner bag on at least two sides on an inwardly folded wall portion. The two inwardly folded wall portions may be connected to each other via the holding means, so that in operation the holding means is loaded to train through the wall sections. The inwardly folded wall portions may be formed symmetrically in order to avoid a displacement of the holding means to a direction by unilaterally acting tensile forces.

The holding means is preferably connected via a seam with the inwardly folded wall portion. The seam is preferably directed outwards, so that the seam does not restrict the effective filter volume of the vacuum cleaner bag.

The vacuum cleaner bag preferably comprises a top and a bottom as a sheet. Also, the holding means may be formed as an air-permeable sheet. The materials used are preferably single-layer or multi-layer nonwoven materials, paper, composite materials, films or other materials. For the holding means can also be used fabrics such as meshes, scrims, yarn, paper, cardboard or foil. To form a seam, these materials can preferably be welded or glued.

According to one embodiment of the invention, at least one seam is provided, which connects the upper part, the lower part and the holding means with each other. As a result, by means of a method step, such as gluing or welding, the individual parts can be connected to one another, which enables effective production.

According to a further embodiment of the invention, the holding means is formed integrally with the upper part and / or the lower part. It is possible to manufacture upper part, lower part and holding means separately, but also an integral design of the holding means is possible. The holding means may be formed in one or two layers, wherein it is possible in a two-ply training to connect an upper layer to the upper part and a lower layer with the lower part, so that the retaining means with the two layers edge forms the inwardly folded wall portion ,

According to a further embodiment, the holding means is held by at least one holder on the upper part and / or lower part. Thereby, a predetermined distance of the holding means to the upper part and / or lower part can be specified, in particular it can be prevented that the holding means rests on the upper part or lower part and thus the available filter surface is reduced. Preferably, the at least one holder is formed integrally with the holding means, for example as a material strip, which is then fixed to the upper part or lower part. The strip of material can be provided by punching out the passage opening if the material strip remains at least partially connected to the holding means during punching.

In the method according to the invention for producing a vacuum cleaner bag, an upper part and a lower part are first provided from a sheet of air-permeable material, the upper part and lower part are preferably formed separately, but can also be made integrally from one piece. Subsequently, a holding means is arranged on a marginal first edge of the upper part and a first edge or fold of the lower part. Then, the first edge of the upper part is connected to the holding means and a first edge or fold of the lower part. In a further step, a second edge or fold of the upper part is then connected to the holding means and a second edge or fold of the lower part, which connects the holding means to the lower part. As a result, a folded wall section is provided with only a few steps, which can be fixed in a folded-in position via a holding means.

Preferably, upper part and lower part of sheet material are substantially tubular and promoted to form a vacuum cleaner bag then upper part and lower part perpendicular to the conveying direction and connected to each other, preferably welded. Thus, the production of the vacuum cleaner bag can be done in a continuous flow process with high efficiency.

Preferably upper part, lower part and retaining means of weldable materials, such as a single or multi-layer nonwoven fabric, which are then welded together.

To form the upper part, lower part and holding means and for producing a vacuum cleaner bag, optionally one, two or three webs of a filter material can be supplied to a processing station. Preferably two or three webs fed parallel to each other to the processing station to produce the vacuum cleaner bag according to the invention.

Figur 1

eine perspektivische Ansicht eines erfindungsgemäßen Staubsaugerbeutels;

Figur 2

eine Draufsicht auf die Einzelteile des Staubsaugerbeutels der Figur 1 ;

Figur 3

eine Seitenansicht des Staubsaugerbeutels der Figur 1 bei der Herstellung;

Figur 4

eine Draufsicht auf den Staubsaugerbeutel der Figur 1;

Figur 5

eine Draufsicht auf Einzelteile eines modifizierten Staubsaugerbeutels;

Figur 6

eine perspektivische Ansicht eines weiteren Ausführungsbeispiels eines Staubsaugerbeutels;

Figur 7

eine perspektivische Ansicht eines weiteren Ausführungsbeispiels eines Staubsaugerbeutels;

Figur 8

eine perspektivische Ansicht eines weiteren Ausführungsbeispiels eines Staubsaugerbeutels;

Figur 9

eine Seitenansicht eines weiteren Ausführungsbeispiels eines Staubsaugerbeutels mit modifiziertem Haltemittel; und

Figur 10

eine Seitenansicht eines zu Figur 9 abgewandelten Ausführungsbeispiels eines Staubsaugerbeutels.

The invention will be explained in more detail with reference to several embodiments with reference to the accompanying drawings. Show it:

FIG. 1

a perspective view of a vacuum cleaner bag according to the invention;

FIG. 2

a plan view of the items of the vacuum cleaner bag FIG. 1 ;

FIG. 3

a side view of the vacuum cleaner bag the FIG. 1 in the preparation of;

FIG. 4

a plan view of the vacuum cleaner bag the FIG. 1 ;

FIG. 5

a plan view of items of a modified vacuum cleaner bag;

FIG. 6

a perspective view of another embodiment of a vacuum cleaner bag;

FIG. 7

a perspective view of another embodiment of a vacuum cleaner bag;

FIG. 8

a perspective view of another embodiment of a vacuum cleaner bag;

FIG. 9

a side view of another embodiment of a vacuum cleaner bag with modified holding means; and

FIG. 10

a side view of an FIG. 9 modified embodiment of a vacuum cleaner bag.

A vacuum cleaner bag 1 comprises an upper part and a lower part 3 made of an air-permeable material, in particular a nonwoven fabric, paper, film or composite material. The vacuum cleaner bag 1 has on two opposite sides of an inwardly folded wall portion 4 on. Each inwardly folded wall portion 4 comprises an upper pleat leg 5, which is formed integrally with the upper part 2, and a lower pleat leg 6, which is formed integrally with the lower part 3.

At a folded edge 7 of the inwardly folded wall portion 4, a holding means 8 is arranged in the form of a sheet, which is at least partially connected to the inwardly folded wall portion 4. The holding means 8 is formed from a sheet of air-permeable material, in particular a nonwoven fabric, paper, foil, a scrim, mesh or other material. A training as a strip, yarn or other connection means between the opposite wall sections 4 is possible. The holding means 8 can be loaded in tension and can also have a certain elasticity. The holding means 8 prevents that the two inwardly folded wall sections 4 inflate during operation of the vacuum cleaner bag to the outside. The holding means 8 can be fixed only in a central region on the inwardly folded wall portion 4. It is also possible that the holding means 8 is fixed over the entire length of the folding edge 7. The holding means 8 is intended to prevent at least a swelling of the inwardly folded wall portion 4 to the outside.

In order to connect the holding means 8 with the inwardly folded wall portion 4, a seam 9 is provided, which is formed by welding or gluing, and on the pleat legs 5 of the upper part 2, the pleat legs 6 of the lower part 3 and an edge portion of the holding means are fixed to each other, preferably by welding or gluing. On the opposite side a seam 10 is provided, which also connects the pleat leg 5 and the pleat leg 6 and the retaining means 8. The seams 9 and 10 are each directed outwards and thus are outside the internal volume of the vacuum cleaner bag.

In FIG. 2 the items of the vacuum cleaner bag 1 are shown before the assembly. At the upper part 2, an inflow opening 12 is recessed, which is surrounded by a holding plate 11. On the holding means 8, a recess 13 is provided, which is formed larger than the inflow opening 12 and after the preparation of the vacuum cleaner bag 1 of the inflow opening 12 is opposite. It is also possible for the recess 13 to be arranged offset to the inflow opening 12, so that an incoming air flow is at least partially deflected by the holding means 8, so that the holding means 8 acts as impact protection.

In FIG. 2 the upper part 2, the lower part 3 and the holding means 8 are each shown as a rectangular sheet, wherein it is expedient for the production when upper part 2, lower part 3 and holding means 8 are fed as web material to a processing station.

In FIG. 3 an intermediate stage of the production of the vacuum cleaner bag 1 is shown. The upper part 2 and the lower part 3 are formed substantially tubular and are separated on the mutually facing side by the holding means 8 from each other. In the region of the free edges of the upper part 2 and the lower part 3 and the edges of the holding means 8, these have been connected to seams 9 and 10 with each other. In this respect, the intermediate stage of the vacuum cleaner bag 1 has an upper hose and a lower hose, which are separated from one another via the holding means 8. In the holding means 8 only recesses 13 are introduced, which allow a flow through.

Starting from FIG. 3 Now, the upper part 2 and the lower part 3 is placed flat on each other, which is prevented by the holding means 8, that the end-side edges of the upper part 2 and the lower part 3 can be moved to the outside, so that inwardly folded wall portions 4 are formed, as in FIG. 1 is shown.

The now flat superimposed track section is formed on four opposite sides of four layers, while in the central region, only the upper part 2, the holding means 8 and the lower part 3 are present. This web is now guided to a cutting and welding station, cut perpendicular to the conveying direction of the vacuum cleaner bag 1 and welded.

The finished vacuum cleaner bag is in the plan view in FIG. 4 shown. Parallel to the conveying direction, the inwardly folded wall sections 4 are arranged with a folding edge 7. The wall sections 4 have a width which is between 10% and 40% of the width of the vacuum cleaner bag, preferably in a range between 1 cm and 8 cm, in particular 2 cm to 5 cm. On the sides perpendicular to the conveying direction cutting edges 14 are provided, which are arranged adjacent to a seam 15, for example by welding or gluing. As can be clearly seen in the plan view, the recess 13 is laterally offset from the inflow opening 12. It is of course also possible to arrange the recess 13 in alignment with the inflow opening 12. Further, a plurality of recesses 13 may be provided, for example, on both sides of the inflow opening 12 at least one recess 13th be provided. In addition, the holding means 8 may also consist of a net or scrim, so that the introduction of recesses 13 is not necessary.

In FIG. 5 a modified embodiment for a vacuum cleaner bag 1 is shown, which corresponds in shape substantially to the previous embodiment. Only the holding means 8 'is formed integrally with the lower part 3, so that instead of the three individual parts ( FIG. 2 ) only two items are available. The upper part 2 corresponds to the previous embodiment. In the manufacture of the vacuum cleaner bag, a seam 9 is now produced on one side, in which an edge of the upper part 2 with an edge of the holding means 8 'and an edge of the lower part 3 are interconnected. On the opposite side is a modified seam 10 ', in which an edge of the upper part 2 is connected to a fold, a strip or a transition region 10' between the holding means 8 'and the lower part 3. In this respect, only one edge and one fold or strip are connected to each other.

It is also possible to produce the vacuum cleaner bag 1 from a single web, so that upper part 2, holding means 8 'and lower part 3 are formed integrally. Then, at the seams 9 and 10, only one edge of the upper part 2 or of the lower part 3 is fixed to one another with a transition section 10 'between holding means and lower part 3 or holding means and upper part 2.

At the in FIG. 4 shown vacuum bags 1 extend the seams 9 and 10 over the entire length of the vacuum cleaner bag 1. It is of course possible to provide the fixation of the holding means 8 only in a central region, so shorter form. For example, the inwardly folded wall sections 4 could also be held together only in a central region, while in the peripheral region, the seams 15 prevent outward swelling. In addition, the holding means 8 need not extend over the entire length of the vacuum cleaner bag 1. It is possible to form the retaining means 8 only as a transverse strip, which is arranged in the region of the inflow opening 12 and is connected at opposite end faces with the inwardly folded wall sections 4.

FIG. 6 shows a perspective view of another embodiment of a vacuum cleaner bag, in which compared to the in FIG. 1 embodiment shown still a holder 20 is provided and otherwise the same components are denoted by the same reference numerals. The holder 20 is formed by a strip of material which is formed during the punching of the passage opening 13 when at least a part of the material strip remains connected to the holding means 8, as shown at an edge 22. The holder 20 is fixed at the free end to the upper part 2 adjacent to the inflow opening 12, so that an incoming air flow initially strikes the holder 20, which acts as a deflection device and impact protection. The holder 20 also ensures that the holding means 8 does not rest on the lower part 3 but spaced from the lower part 3 is held.

In FIG. 7 is one opposite FIG. 6 modified embodiment shown in which a holder 30 is formed integrally with a holding means 8. The holder 30 is connected at a transition to the holding means 8 and fixed on the opposite side 32 on the lower part 3 in a central region opposite to the inflow opening 12. The holder 30 can also form an impact protection and also ensures that the incoming air flow pulls the lower part 3 away from the upper part 2 and the retaining means 8 is also pulled away from the upper part 2 by the holder 30. This ensures that the holding means 8 is spaced from the upper part 2 and held by the lower part 3 and the corresponding filter surfaces can be flowed through.

At the in FIG. 8 the embodiment shown, a holder 40 is provided, which is arranged in a loop shape and unlike the holder 20 in FIG. 6 is fixed at the free end 41 on the opposite side of the inflow opening 12. As a result, an air flow entering through the inflow opening 12 can flow through the through-opening 13 onto the lower part 3, then being pulled away from the holding means 8 and the upper part 2, so that a secure unfolding of the vacuum cleaner bag after insertion into a vacuum cleaner is ensured.

The in the FIGS. 6 to 8 shown holders 20, 30 and 40 may be combined with each other, for example, a plurality of holders may be fixed to the holding means 8 in order to ensure a predetermined spacing between the upper part 2, holding means 8 and lower part 3.

In addition, it is possible to provide further elements in the vacuum cleaner bag. In FIG. 9 For example, a vacuum cleaner bag is shown in which a dividing wall 50 is arranged in an upper chamber between upper part 2 and a holding means 8 "', the dividing wall 50 being adjacent to an edge 52 Inflow opening 12 fixed to the upper part 2 and on the opposite side to a seam 51 between the upper part 2 and a pleat leg 5. The partition may be formed as a rectangular piece of material, preferably made of a non-woven, and at the edges, not shown, at the seams 15 of the vacuum cleaner bag ( FIG. 4 ).

At the in FIG. 9 In the exemplary embodiment shown, the holding means 8 "is formed in two layers, with an upper layer forming the upper pleat leg 5 and a lower layer forming the lower pleat leg 6. The pleat legs 5 and 6 are connected to one another at at least one connection point 18, preferably a weld includes a frame-shaped portion surrounding a through-hole 13.

At the in FIG. 10 embodiment shown is opposite to in FIG. 9 embodiment shown, the partition 50 omitted and arranged on opposite sides an additional spacer 60 between the upper pleat leg 5 and the lower pleat leg 6. The spacer 60 is formed from a shaped body, for example made of foam, and has upper ribs 61 for abutment with the upper fold leg 5 and lower ribs 62 for engagement with the lower fold leg 6.

In the FIG. 9 shown partition 50 and the spacer 60 can also in the embodiments of FIGS. 1 to 8 be provided.

Claims (12)

1. Vacuum cleaner bag (1), with at least one inwardly folded wall section (4), which is held in the inwardly folded position by way of at least one holding means (8, 8'), characterised in that the holding means (8, 8') is formed by an air-permeable areal structure and the areal structure has at least one cut-out (13) or is formed from a net or mesh.
2. Vacuum cleaner bag according to claim 1, characterised in that the holding means (8, 8') is fixed at least in a centre region of the inwardly folded wall section (4).
3. Vacuum cleaner bag according to claim 1 or 2, characterised in that an inwardly folded wall section (4) is provided at at least two sides.
4. Vacuum cleaner bag according to any one of the preceding claims, characterised in that two inwardly folded wall sections (4) are connected together by way of the holding means (8, 8').
5. Vacuum cleaner bag according to any one of the preceding claims, characterised in that the holding means (8, 8') are connected with the inwardly folded wall section (4) by way of a seam (9, 10).
6. Vacuum cleaner bag according to claim 5, characterised in that the seam (9, 10) is oriented outwardly.
7. Vacuum cleaner bag according to any one of the preceding claims, characterised in that the vacuum cleaner bag (1) comprises an upper part (2) and a lower part (3) as areal structure.
8. Vacuum cleaner bag according to claim 7, characterised in that at least one seam (9, 10) connecting the upper part (2), the lower part (3) and the holding means (8, 8') together is provided.
9. Vacuum cleaner bag according to any one of claims 1 to 8, characterised in that the cut-out (13) is arranged to be laterally offset with respect to an inflow opening (12) in the upper part (2) or the lower part (3).
10. Vacuum cleaner bag according to any one of the preceding claims, characterised in that the holding means (8') is constructed integrally with the upper part (2) and/or the lower part (3).
11. Vacuum cleaner bag according to any one of the preceding claims, characterised in that the vacuum cleaner bag (1) is constructed as a flat bag and has at opposite sides a four-layered edge section with an inwardly folded wall section (4).
12. Vacuum cleaner bag according to any one of the preceding claims, characterised in that the holding means (8, 8') is held at the upper part (2) and/or lower part (3) by way of at least one holder (20, 30, 40).

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