EP2939583A1 - Method and device for producing a vacuum cleaner bag and vacuum cleaner bag - Google Patents

Abstract

A method for producing a vacuum cleaner bag uses a flat bag having an upper and a lower layer (2, 3) of filter material, which are circumferentially connected to each other via a first seam (4), wherein a layer (2) has an inflow opening (5) , The flat bag is then inflated with a fluid and at least one shape-changing means (12, 13) for facilitating unfolding of the vacuum cleaner bag is applied, in particular a weld. Furthermore, the invention relates to a device for carrying out the method and a dust bag, in which at least one corner (9) on the filter material, a means (12, 13) is provided for facilitating the unfolding.

Description

The present invention relates to a method for producing a vacuum cleaner bag, a device for carrying out the method, and a vacuum cleaner bag having an upper layer and a lower layer of filter material, which are connected to one another via a circumferential first seam, wherein at least one layer has an inflow opening.

The EP 1 915 939 discloses a filter bag for a vacuum cleaner in which an upper layer and a lower layer of a filter material are welded together at the edge edge edges. Such filter bags are also referred to as flat bags and are folded for transport both on two sides in a first direction and then adjacent to the holding plate in a second direction. When inserting such a flat bag in a vacuum cleaner, it may happen that the deployment of the vacuum cleaner bag is inhibited by an internal ribbing on the vacuum cleaner or jamming of the folding. To facilitate the unfolding of such a flat bag was in the DE 10 2009 044 505 proposed to provide an inwardly directed fold on at least one edge of the vacuum cleaner bag.

Furthermore, there are so-called block bottom bag, which have a cuboid or block-shaped bottom portion and therefore are better adapted to a cuboid contour of a chamber of a vacuum cleaner. In the EP 1 776 909 a vacuum cleaner bag is described in which a bottom portion is formed substantially as a block bottom bag, however, additionally has fold-out side folds outward. However, the production of such a block-shaped bottom is complicated, because to fold the bag in the bottom area devices, such as swords, must be inserted into the bag, in order then to effect a corresponding folding. As a result, the production is complicated and the production time per vacuum cleaner bag significantly extended compared to flat bags.

It is therefore an object of the present invention to provide a method and an apparatus for producing a vacuum cleaner bag, which is an effective Make a vacuum cleaner bag and ensure easy unfolding of the vacuum cleaner bag.

In the method according to the invention for producing a vacuum cleaner bag, a flat bag with an upper and a lower layer of filter material, which are circumferentially connected to each other by a first seam, wherein at least one layer has an inflow opening, is inflated with a fluid to then in the inflated state at least one shape-changing means for facilitating the unfolding of the vacuum cleaner bag to install. As a result, the flat bag is changed in shape so that it can be unfolded more easily during later insertion into the vacuum cleaner bag. As a shape-changing means, in particular connecting points, seams, folds or other means may be provided which facilitate the unfolding when inserting the vacuum cleaner bag.

Through the use of shape-changing means in addition to facilitating the unfolding of the vacuum cleaner bag can also be a better fit in the dust chamber of the vacuum cleaner, since the vacuum cleaner bag may be more cuboid and thus better adapts to the shape of the dust chamber. By the shape-changing means the vacuum cleaner bag can have more filling volume.

In addition, the vacuum cleaner bag sets the air flow less resistance to flow, since no superfluous nonwoven material must hineinzwängen into the dust chamber.

According to a preferred embodiment, the filter material of the vacuum cleaner bag is processed at least one point by welding and / or gluing in the inflated state. In order to give the flat bag a three-dimensional contour, while the upper layer of the filter material between two points can be glued or welded together and / or glued or welded the lower layer with another point on the lower layer. As a result, folding edges are produced which give the flat bag a folding edge in a direction substantially perpendicular to the plane of the first seam. The seams, in particular welds, preferably have an area of more than 4 mm ² . Welding points have a diameter of at least 2 mm.

Preferably, the flat bag is provided at least one corner with a weld, which is aligned at an angle to the peripheral edge seam. The weld can be aligned at right angles to the seam or at an angle of greater than 45 °, in particular greater than 60 °.

In a preferred embodiment, at least one corner is welded and then cut off. Preferably, two corners may be welded or cut to form a block bottom. It is also possible to weld all four corners to form a cuboid and then cut it off so that a "block bottom" is formed both at the lower layer and at the upper layer, ie a double block bottom.

The device according to the invention for carrying out the method comprises a device for inflating the flat bag and at least one welding or adhesive device for producing a shape-changing means for facilitating the unfolding of the vacuum cleaner bag.

The vacuum cleaner bag according to the invention comprises an upper layer and a lower layer of filter material, which are connected to one another via a circumferential first seam, wherein at least one layer has an inflow opening. At least one corner of the vacuum cleaner bag, a means for facilitating the unfolding is provided on the filter material. This should be improved when inserting the vacuum cleaner bag handling.

Preferably, a weld is provided at least at one corner at an angle to the first seam, for example at an angle greater than 60 °. It is also possible to provide only one or more welding spots or adhesive spots instead of the weld. In addition, embossing or folding edges may be provided on the filter material to facilitate unfolding.

Figuren 1A und 1B

zwei Ansichten eines Flachbeutels im aufgeblähten Zustand;

Figur 2

eine Ansicht des Flachbeutels der Figur 1 bei der Herstellung einer Schweißnaht im Eckbereich;

Figur 3

eine Ansicht eines Staubsaugerbeutels, der auf einer Seite eine quaderförmige Kontur besitzt;

Figuren 4A und 4B

zwei Ansichten eines Staubsaugerbeutels, der eine quaderförmige Kontur besitzt, und

Figuren 5A und 5B

zwei Ansichten eines Staubsaugerbeutels mit im Wesentlichen quaderförmiger Kontur gemäß einem modifizierten Ausführungsbeispiel.

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

Figures 1A and 1B

two views of a flat bag in the inflated state;

FIG. 2

a view of the flat bag of the FIG. 1 in the production of a weld in the corner area;

FIG. 3

a view of a vacuum cleaner bag having a cuboid contour on one side;

FIGS. 4A and 4B

two views of a vacuum cleaner bag, which has a cuboid contour, and

FIGS. 5A and 5B

two views of a vacuum cleaner bag with a substantially cuboid contour according to a modified embodiment.

A flat bag 1 serves as a blank for producing a vacuum cleaner bag according to the invention. The flat bag 1 comprises an upper layer 2 and a lower layer 3 of filter material, which are peripherally connected by a seam 4, in particular a weld, connected to each other. On the upper layer 2, an inflow opening 5 is provided which is surrounded by a holding plate 6 for holding the vacuum cleaner bag in a vacuum cleaner. The inflow opening 5 can be closed via a closure element, in particular a closure flap or a closure slide. As a filter material for the upper and the lower layer 2, 3, a single or multi-layer nonwoven fabric or a composite material of nonwoven fabric and paper can be used. Preferably, a filter material of a multilayer nonwoven fabric is used, which can be welded.

In the Figures 1A and 1B the flat bag 1 is shown in a inflated state, so that the flat bag has a pillow-shaped contour, in which the circumferential seam 4 is arranged in a central region. To inflate the flat bag 1, a connection piece can be inserted into the inflow opening 5 in order then to blow air into the flat bag 1. Such a connection piece can be provided on a production device, for example on a rotating rim. Air is used as the fluid for inflating the flat bag 1, but other fluids, in particular gases or liquid media, can also be used, if appropriate with provision of a corresponding intermediate layer. For inflating the flat bag 1, a liquid could also be used which is pumped into the flat bag 1 within a flexible material, for example a balloon.

In FIG. 2 a corner 9 of the flat bag 1 is shown, which is provided with a shape-changing means for facilitating the unfolding of the vacuum cleaner bag. For this purpose, the flat bag 1 in the inflated state with a Weld 12 provided by a sonotrode 10 and an anvil 11. The weld 12 forms with the corner 9 in the plan view of a triangle, which is welded to the upper layer with the upper layer and the lower layer with the lower layer during welding. The line-shaped weld 12 seals the vacuum cleaner bag so that the corner 9 on the outer side of the weld 12 can be severed without the vacuum cleaner bag becoming leaky.

Of course, it is also possible, instead of a continuous weld 12, to provide only individual spot welds, adhesions, fold edges or folding aids which facilitate the unfolding of the vacuum cleaner bag.

When producing a weld seam 12 at a corner 9 of the vacuum cleaner bag, a three-dimensional contour results at this corner, wherein preferably at least two corners 9 are provided with a corresponding weld seam 12, as shown in FIG FIG. 3 is shown. The two corners 9 next to the weld 12 are cut off. At two corners of the vacuum cleaner bag, a weld 12 is provided, which extends substantially perpendicular to the seam 4 between the upper layer 2 and the lower layer 3. As a result, the vacuum cleaner bag in this area has a seam 4 and two welds 12, which have the shape of a double-T. On the opposite side, the corners are formed as in a flat bag, so that only in the region of the welds 12 a block bottom is formed.

In the embodiment of the FIGS. 4A and 4B all four corners are provided with a weld 12 which extend substantially perpendicular to the circumferential seam 4. As a result, the vacuum cleaner bag has a cuboid contour and can also be referred to as a vacuum cleaner bag with double block bottom. The inflow opening 5 within the holding plate 6 is aligned in a plane substantially perpendicular to side wall portions on which the circumferential seam 4 is provided. The welds 12 can have a length between 1 cm and 15 cm, in particular 2 cm to 8 cm, so that the vacuum cleaner bag optimally fits into an interior of a vacuum cleaner. The welds 12 have a higher strength than the filter material, so that the welds 12 form edges for reinforcement, which are aligned substantially perpendicular to the plane of the circumferential seam 4.

In the in the FIGS. 5A and 5B shown embodiment welds 13 are provided at four corners alone, which unlike in the embodiment of FIG. 4 not linear, but have a kink. The welds 13 converge to a tip 14, so that the finished vacuum cleaner bag is not exactly cuboid, but in the region of the plane of the peripheral seam 4 has a greater circumference than in the region of the plane of the inflow opening at the top or at a bottom of the vacuum cleaner bag. The angle between the welds 13 may be in a range between 180 ° to 60 °, in particular 160 ° to 120 °.

In the illustrated embodiments, line-shaped welds 12 and 13 are provided, wherein after production of the welds 12 and 13, the corners 9 are cut off from the vacuum cleaner bag. As a result, the vacuum cleaner bag, starting from a flat bag, is given a rather cuboidal contour, even if the edges do not necessarily have to run perpendicularly to the plane of the seam 4, as is the case with the exemplary embodiment of FIG FIGS. 5A and 5B shows.

In the manufacturing method according to the invention, the flat bag is first inflated or filled with a fluid, so that the flat bag receives a pillow-shaped contour. The term "inflation" is also intended to include the use of a liquid fluid. In the inflated state, shape changing means, in particular welds 12 or 13 or adhesive seams, are then provided to facilitate unfolding of the vacuum cleaner bag. Preferably, a weld 12 or 13 is provided, which is provided at a corner 9 of the flat bag 1, so that after production of the weld 12 and 13, the corner 9 can be cut off. This can be done both at two corners 9, but preferably at all four corners, so that the vacuum cleaner bag receives a rather cuboid contour. After welding, the vacuum cleaner bag can then be folded and flattened to minimize the storage volume in a package. By arranged at an angle to the seam 4 welds 12 and 13 or corresponding welding points or folding edges the unfolding of the vacuum cleaner bag is facilitated after insertion into a vacuum cleaner.

In the illustrated embodiments, welds are used as shape-changing means. It is also possible additionally or alternatively to provide adhesive bonds, punched out and / or folds on the filter material.

LIST OF REFERENCE NUMBERS

1

flat bags

2

location

3

location

4

seam

5

inflow

6

Retaining plate

9

corner

10

sonotrode

11

anvil

12

Weld

13

Weld

14

top

Claims (11)

Method for manufacturing a vacuum cleaner bag, comprising the following steps: - Producing a flat bag (1) having an upper and a lower layer (2, 3) of filter material, the peripherally peripherally connected by a seam (4), wherein at least one layer (2) has an inflow opening (5); - Inflating the flat bag (1) with a fluid, and - Attaching at least one shape-changing means (12, 13) for facilitating the unfolding of the vacuum cleaner bag. A method according to claim 1, characterized in that the filter material is processed at least one point (12, 13) by welding and / or gluing in the inflated state. A method according to claim 1 or 2, characterized in that at at least one corner (9) of the flat bag (1) a weld (12, 13) is mounted, which is aligned at an angle to the peripheral edge seam (4). A method according to claim 3, characterized in that at least one corner (9) is welded and then cut off. A method according to claim 3 or 4, characterized in that two corners (9) are welded and cut to form a block bottom. A method according to claim 3 or 4, characterized in that four corners (9) are welded and cut to form a cuboid. Device for carrying out the method, with a device for inflating the flat bag (1) and at least one welding or adhesive device for producing a shape-changing means (12, 13) for facilitating the unfolding of the vacuum cleaner bag. Vacuum cleaner bag with an upper layer (2) and a lower layer (3) made of filter material, which via a peripheral circumferential first seam (4) with each other wherein at least one layer (2, 3) has an inflow opening (5), characterized in that at least one corner (9) of the vacuum cleaner bag to the filter material, a means (12, 13) is provided to facilitate unfolding. Vacuum cleaner bag according to claim 8, characterized in that at least one corner (9) is provided a weld seam (12, 13) at an angle to the first seam (4). Vacuum cleaner bag according to claim 9, characterized in that the weld seam (12, 13) is aligned at an angle greater than 60 ° to the first seam (4). Vacuum cleaner bag according to one of claims 8 to 10, characterized in that at least one folding edge or embossing is provided as a means for facilitating the unfolding at a corner (9).

Images