EP2018111A1 - Dust filter bag - Google Patents

Abstract

The invention relates to a dust filter bag in the form of a flat bag (1) for a vacuum cleaner which is formed by a first layer (8) and a second layer (7) made from a bondable material, wherein the layers (7, 8) are bonded to each other along the length of their periphery.

Description

 Vacuum Cleaner Bags

The invention relates to a dust filter bag in the form of a flat bag for a vacuum cleaner, which is formed from a first layer and a second layer of a weldable material, wherein the layers are circumferentially welded together along its circumference. The dust filter bag according to the invention is particularly characterized in that one of the layers of the flat bag is at least partially folded on at least one side of the bag to the bag interior to form a first and second pleat leg.

A dust filter bag in the form of a flat bag with gussets is known from DE 20 2005 000 917 Ul. In this case, this flat bag consists of an outer wall and a sub-wall congruent to it, wherein the wall material is formed from a flexible, weldable material and is attached to its surrounding wall. along the peripheral edge is welded together. The characteristic of this dust filter bag is that on at least one side of the bag to the inside of a folding is provided, which has been realized by one nen formed by the upper wall pleat legs and formed by the lower wall pleat legs. In this flat bag is thus assumed by two major congruent large upper and lower walls of the flexible material and then made a weld edge. In a second step, the wrinkling is then performed, so that the weld on the side at which the folding occurs, then when the bag is folded, is disposed within the fold. In the operating state, the folding can then be everted.

The disadvantage of such a dust filter bag, however, that is formed by the symmetrical structure of the approximately congruent upper and lower wall and the folding of the dust filter bag in the operating state, a predetermined outer fold, so that an adaptation to various vacuum cleaner models is difficult. The folding in of the lateral folds is also not easy to manufacture.

Proceeding from this, it is therefore the object of the present invention to develop a flat bag as described above to the effect that the flat bag is adaptable to the geometry of the dust collection chamber of the different vacuum cleaner models. Another object of the invention is to provide a corresponding simpler method for producing such a flat bag. The invention is achieved with respect to the flat bag by the features of claim 1 and with respect to the method by the features of claim 12.

According to the invention, it is thus proposed that the folding be realized on at least one side of the bag of the flat bag in such a way that the folding in one of the two layers is made and the folding can be everted. Under

The fold-out is understood in the sense of the invention as meaning also the unfolding of the pleat legs to each other up to the complete outward protrusion of the side pleat. The dimensioning is designed in such a way that the larger pleat leg can then be welded to the second layer forming a protrusion on the edge side of the flat bag according to the present invention thus no weld seam is present in the collapsed state in the inner fold Welding takes place at the edge between the peripheral edge of the second layer and the projection of the larger pleat leg of the folded layer. there In the everted state different geometries such as trapezoid or triangle can be realized. In addition, the manufacturing technically difficult Einülpprozess is avoided for the gussets after welding.

In the flat bag according to the invention, it is preferred if a folding on two opposite sides of the bag is made.

In the case of the dust filter bag according to the invention, it is preferred that the folding be designed such that it is ejected substantially over the entire width of the bag side. The folding can be designed in such a way that a substantially trapezoidal outer fold is produced in the completely everted state. If the folding is additionally fixed in all marginal areas, then outer folds deviate from the trapezoidal shape.

A further embodiment of the invention proposes that the fold-out folding be formed in such a way, e.g. by a one-sided fixation that over at least one width of the bag side only partially an outer fold, e.g. in triangular form. In this case, a corresponding inner fold is present at the same time. By corresponding folds on two opposite sides of the bag can thus in the operating state, i. then, when the folding is completely everted, various forms are realized. So is u.a. also an offset arrangement possible, in each case the fixation of the folds have been made on opposite sides of the respective sides of the bag, so that the outer folds are arranged offset.

The dust filter bag according to the invention is preferably selected from its basic shape so that it has a rectangular or square shape. As a weldable air-permeable material for the individual layers of the flat bag according to the invention is in particular nonwoven material, here also particularly preferably composite materials of nonwoven materials with different filter properties suitable.

In the flat bag according to the invention, it is of course also possible, as hitherto known in the prior art, for the introduced inlet opening to be reinforced by a holding plate, which may also be designed to be closable.

The invention further relates to a method for

Production of a flat bag as described above.

According to the invention, the procedure is such that, in departure from the procedure described in DE 20 2005 000 917 U1, the folding is first carried out and then only then the welding takes place. According to the invention, this takes place in that a first web-shaped sub-web is provided with a larger area in relation to a web-shaped top web and that the fold is then introduced into this sub-web. In the case of folding, a folding is realized, which consists of a first and second pleat leg, wherein the second pleat leg has a greater leg length and forms a projection with respect to the web. Subsequently, a welding of the upper web with the lower web, wherein the lower web is welded in the edge region of the supernatant with the longitudinal edges of the upper web then takes place. To form the filter bag, it is then only necessary to introduce transverse welds into correspondingly prescribed intervals and to carry out a separation.

The great advantage of the method according to the invention is the fact that due to the fact that First, a folding is introduced into the sub-web, can be formed by introducing punch-outs into the fold and corresponding welds, inclusions, which then lead in the everted state to outer folds in different geometries. Thus, Ausfüülpare outer folds can be realized in the fully everted state in trapezoidal and triangular shape, so that an adaptation of the dust filter bag to the different geometries of the dust collecting spaces of different vacuum cleaner models is possible.

In this case, the method according to the invention can be further developed such that a separation is carried out simultaneously with the transverse welding to form the flat bag. It is also advantageous if, in order to support the folds, preliminary breaks are introduced into the lower web. In particular, ultrasonic welding has proven to be suitable as a welding method.

Embodiments of the invention will be explained in more detail below with reference to FIGS. 1 to 8, without restricting the subject matter of the present invention thereto.

Show it:

1 shows a dust filter bag according to the invention in a schematic plan view,

2 shows the dust filter bag of Figure 1 in cross section along the section line II in an enlarged view, FIG. 3 shows a plan view of a dust filter bag with two trapezoidal protuberances.

FIG. 4 shows a further embodiment of the dust filter bag according to the invention with triangular protuberances on both sides,

FIG. 5 shows an embodiment in which a triangular protuberance is present on only one side,

Figure 6 shows an embodiment with opposite triangular protuberances.

Figure 7 in the figure sequence 7a to 7g a first

Process variant for the preparation of

Flat bag,

8 in the figure sequence 8a to 8h a second

Process variant for the preparation of

Flat bag.

In Figure 1 is shown schematically in plan view, a dust filter bag in the form of a flat bag 1 in a rectangular shape. With 2 and 3 are not visible from the plan view folds, which are formed in the example of Figure 1 on the bag sides 4 and 5 in trapezoidal shape, symbolizes. In the embodiment according to FIG. 1, an inlet opening 6 is furthermore provided in the middle of the flat bag 1. The shape of the flat bag 1, which is chosen here square, can of course also deviate from the square shape and be formed rectangular. The flat bag points a circumferential weld 11, which has been realized by means of ultrasonic welding, the material of the flat bag is a multilayer nonwoven material.

FIG. 2 now shows the cross section according to the section line I-I in the embodiment according to FIG. 1. FIG. 2 particularly clearly shows the folding 2, 3 according to the invention. The dust filter bag according to the embodiment of Figure 1 consists of a first layer 8 and a second layer 7 of the multilayer weldable material. The first layer 8 has a fold with the pleat legs 9, 10 or 9 ', 10'. The pleat legs 9, 10 and 9 ', 10' are designed so that they have an uneven length, wherein the larger of the pleat legs 9, 9 'forms a projection with respect to the layer 8. When dimensioning the web-shaped layers 7 and 8, therefore, care must be taken that a corresponding weld on the outer peripheral edge of the pleat legs 9, 9 'or at the outer peripheral edge of the second layer 7 can be done. In order to form the trapezoidal folds 2, 3 shown, it is necessary that the folds 2, 3 are closed at their short legs by an additional weld seam 20. For producing such a folding 2, 3 reference is made to Figures 8a to 8h.

The folding according to the invention causes, when the filter bag is filled in the inserted state through the inlet opening 6 with dust-laden air, a puffing, so that then expand the folds 2, 3 with the pleat legs 9, 10 and 9 ', 10' and optionally turn outward so that an enlarged volume is created. In Figure 3, the corresponding shape, which then results in the fully everted state, shown schematically in plan view. With 11 in turn the circumferential weld is designated, the reference numerals 2 and 3 denote the everted folds, which form a trapezoidal shape.

FIG. 4 shows a further embodiment of a flat bag according to the invention. In the case of the flat bag according to FIG. 4, the fold was formed in such a way that it was then welded to the side of the weld 11 on one side of the bag as in FIG. 4 on the same side 23, so that only one side on the side 24 is a protuberance forming an outer fold 13, 13 'takes place and on the bag side 23, in which a welding of the folds takes place simultaneously with the circumferential weld 11, an inner fold 14, 14' is formed, so that a total conical design of the dust filter bag in fully everted

Condition results. The manufacturing method for this purpose is explained in more detail in FIG. 8 (bag side 24) and FIG. 7 (bag side 23).

FIG. 5 now shows a further modification of the flat bag, in which a folding, as shown in FIG. 4, has been carried out only on one side of the bag.

Finally, FIG. 6 also shows an embodiment in which an offset arrangement of the outer folds 13 and 13 'has been carried out by correspondingly fixing on the sides 23 and 24 of the respective side folds so that the outer folds 13, 13' are offset. FIG. 7 now shows in the sequence of FIGS. 7a to 7g a first production method for the flat bag according to the invention.

In this process is in a first

Step a web-shaped sub-web made of a nonwoven fabric provided. The dimensioning of this sub-web is in width (designated b) chosen so that after folding a width c realized (Figure 7c), which corresponds approximately to the then to be connected to the lower web top web. In Figure 7a, the direction of the lower web is indicated by the arrow.

In order to form the fold according to the invention, the procedure is such that, preferably, in a first step, the web-shaped lower web is folded over. This is shown in FIG. 7b. Subsequently, as shown in Figure 7c, a refolding is then carried out, so that a folding to form a first pleat leg 10 and a second pleat leg 9 and 9 'or 10' is formed. The second pleat leg 9 or 9 ', which forms a supernatant, is chosen to be greater in its leg length than the pleat legs 10 and 10'.

In the next process step, a top web is placed on the so-folded sub-web. The dimensioning of the top sheet is chosen so that the longitudinal edges are approximately flush with the edges of the pleat legs 9 and 9 '. The upper web is, as shown here in FIG. 7d, already provided with a filling opening 6 and a holding plate (not shown). Subsequently, a longitudinal welding is then carried out (Figure 7e).

For the completion of the filter bag, it is still only necessary to introduce transverse welds at a predetermined spacing, as shown in FIG. 7f. Finally, a separation takes place in the region of the transverse welds 11 so that a finished filter bag is then produced (FIG. 7g). In the manufacturing process of the filter bag according to the invention, as shown in FIGS. 7a to 7g, a filter bag is now formed in which folds 2, 3 are present which are fixed to the bag sides 23, 24 by the circumferential weld seam 11. In the operating state is then carried out in the embodiment, as is realized with the method according to FIG 7, an expansion of the pleat legs or a protuberance.

In the figure sequence 8a to 8h is a variant of

Production method of the flat bag according to the invention shown. As a modification to the method described above, as shown in FIG. 8b, after the folding over, punched-out portions 30 are introduced into the folded-over region. These punches 30 are preferably welded circumferentially to form the weld 31 (see Figure 8c). After the welding of the punched-out portions 30, a folding-back takes place, as already shown in FIG. 7d. Analogously to the method, as has been described in FIG. 7, the upper web (8e) is subsequently applied and the longitudinal edges are welded together to form the weld seam 11 (8f).

It is essential, as shown in FIG. 8g, that during the transverse welding, the transverse weld 11 is so tight. is selected to pass through the respective punched holes 30, respectively. In the manufacturing method according to FIG. 8, an embodiment is shown in which the punched-out portions 30 are arranged symmetrically and the respective transverse welds 11 are guided centrally through the punched-out portions 30. This results in a flat bag, as shown in Figure 8h, which has a trapezoidal fold 2, 3, which describes additional welds 20 of the short legs of the trapezoid. The flat bag produced by the production method according to FIG. 8 corresponds to the flat bag according to FIG. 1,

The sequence of FIGS. 8a to 8h likewise makes it clear that the method according to the invention has great flexibility. Thus, it is always possible to produce flat bags, in which by selecting and spacing the recesses 30 corresponding dust bags are realized, in which the folds are still fixed on one side in a modification of the example of FIG. As a result, dust filter bags are produced, which have in the everted state forms, as they have been shown in Figures 4 to 6. The inventive method thus has an extremely high flexibility with respect to the dust filter bag to be produced and at the same time is technically easy to perform.

Claims

claims 1. dust filter bag in the form of a flat bag (1) for a vacuum cleaner, which consists of a first layer (8) and a second layer (7) made of a weldable material, wherein the two layers (7,8) circumferentially along each other are welded and that in one of the two layers at least one inlet opening (6) is introduced, characterized in that one of the layers of the flat bag on at least one side of the bag to Bag inside out to form a first and second pleat leg (9, 9 ', 10, 10') which are unequal length, ausstülpbar folded. 2. Dust filter bag according to claim 1, characterized in that on two opposite sides of the bag (4.5) in each case the position is folded ausstülpbar. 3. dust filter bag according to claim 1 or 2, characterized in that the ausstülpbare folding is designed so that it is ausstülpbar substantially over the entire width of the bag side (s) (4,5). 4. dust filter bag according to claim 3, characterized in that the fold (2,3) is formed so that it forms a substantially trapezoidal outer fold in the fully everted state. 5. Dust filter bag according to claim 1 or 2, characterized in that the ausstülpbare folding (2,3) is formed so that it is ausstülpbar only partially over the width of the bag side (s) (4,5). 6. dust filter bag according to claim 5, characterized in that the fold is formed so that they are in the fully everted state, a substantially triangular-shaped External fold (13,13 ') forms. 7. dust filter bag according to claim 5, characterized in that on two opposite sides of the bag (4.5), the outer folds (13,13 ') are arranged opposite. 8. Dust filter bag according to at least one of claims 1 to 8, characterized in that the dust filter bag has a rectangular or square shape. 9. Dust filter bag according to at least one of claims 1 to 8, characterized in that the material of the layers of the dust filter bag is a nonwoven material. 10. dust filter bag according to claim 9, characterized in that the nonwoven material is a composite material of a plurality of layers. 11. Dust filter bag, according to at least one of claims 1 to 10, characterized in that the at least one Inlet opening (6) is reinforced with a retaining plate. 12. A method for producing a dust filter flat bag according to at least one of claims 1 to 11, characterized a) that a web-shaped sub-web is provided with a larger area than a web-shaped upper web, b) that in the sub-web at least one Side folding is performed to form a first and second pleat leg, wherein the second pleat leg has a greater leg length and forms a supernatant, c) that the upper web is brought over the lower web, d) that the lower web is welded in the edge region of the supernatant with the longitudinal edges of the upper web, e) that the lower web are transversely welded to the upper web by a predetermined distance, and f) that a separation in the region of the transverse welds to form the flat bag takes place with a first and second position. 13. The method according to claim 12, characterized in that the folding is carried out on two opposite sides of the web-shaped lower web. 14. The method according to claim 12 or 13, characterized in that for the formation of the folding (feature b)) in the lower web in a first step, a refolding and in a second step, a refolding to form a supernatant is performed. 15. The method according to claim 14, characterized in that introduced into the unfolded region of the lower web punched and whose edges are at least partially welded together and that subsequently the refolding is performed. 16. The method according to claim 15, characterized in that the number and the spacing of the cut-outs in the lower web are chosen so that at the Querverschwei- tion (feature e)) leads at least one Querverschwei- tion through a recess. 17. The method according to claim 16, characterized in that the Querverschwei- ßungen (feature e)) each lead by two arranged on each side punch outs. 18. The method according to at least one of claims 16 or 17, characterized in that the punched-out sections are substantially trapezoidal, triangular or semicircular. 19. The method according to at least one of claims 12 to 18, characterized in that in the upper web at least one inlet opening is introduced. 20. The method according to at least one of claims 12 to 19, characterized in that the Quergewwei- ßungen and the separation (features e) and f)) are performed in one operation. 21. The method according to at least one of claims 12 to 20, characterized in that are introduced to support the folds Vorbrüche in the sub-web. 22. The method according to at least one of claims 12 to 21, characterized in that the welding takes place by means of ultrasonic welding.