Method for integral connection of a retaining plate to the wall of a vacuum cleaner filter bag and also vacuum cleaner filter bag

Abstract

The present invention relates to methods for the production of an improved integral connection of a retaining plate to the wall of a vacuum cleaner filter bag. According to a first variant, the retaining plate is not applied directly on the wall of the vacuum cleaner filter bag but rather a textile material is disposed between retaining plate and the wall. The connection of the retaining plate and the wall of the vacuum cleaner filter bag is thereby effected via the textile material. According to a second variant, in regions between retaining plate and wall of the vacuum cleaner filter bag, a film made of a thermoplastic material is disposed between wall of the vacuum cleaner filter bag and retaining plate. The connection of the retaining plate and the wall of the vacuum cleaner filter bag is thereby effected via the film. According to a third variant, the retaining plate is connected directly to the wall of the vacuum cleaner filter bag. The wall is thereby formed, at least in the region in which the retaining plate is applied, as film made of special thermoplastic materials. The present invention relates likewise to vacuum cleaner filter bags in which the retaining plate is connected integrally to the wall of the vacuum cleaner filter bag according to the preceding principles.

Claims

1. A method for integral connection of a retaining plate to a wall of a vacuum cleaner filter bag at an application location, the method comprising: a) at least in regions in a region of the application location of the retaining plate, at least in regions, producing an integral, frictional or form-fitting connection of the wall of the vacuum cleaner filter bag to at least one layer of a textile material, and pressing the retaining plate onto a side of the wall, provided with the textile material, of the vacuum cleaner filter bag, at the application location, or b) at least in regions on the retaining plate, at least in regions, producing an integral, frictional or form-fitting connection of the retaining plate to at least one layer of a textile material, and pressing the retaining plate with a side, provided with the textile material, onto the wall of the vacuum cleaner filter bag, at the application location, or c) between the wall of the vacuum cleaner filter bag and the retaining plate at least in regions, in the region of the application location of the retaining plate, introducing at least one layer of a textile material, and pressing the retaining plate together with the textile material onto the wall of the vacuum cleaner filter bag, at the application location, and subsequently producing an integral connection between the wall of the vacuum cleaner filter bag, the textile material and the retaining plate.

2. The method according to claim 1, wherein the wall of the vacuum cleaner filter bag, at least in the region of the application location of the retaining plate, comprises a thermoplastic material or consists thereof or is formed therefrom, the textile material comprises thermoplastic fibres or thermoplastic filaments or consists hereof or is formed herefrom, or at least an abutment side of the retaining plate comprises a thermoplastic material, at least in regions, or consists of or is formed completely from a thermoplastic material or the entire retaining plate consists of or is formed from a thermoplastic material.

3. The method according to claim 2, wherein the thermoplastic fibres or the thermoplastic filaments of the textile material are formed from a material which has a melting temperature which is less than or equal to the melting temperature of the thermoplastic material of the wall of the vacuum cleaner filter bag or than the melting temperature of the thermoplastic material of the retaining plate, the melting temperature being determined respectively according to ISO 11357-3:2011-05, or has a melt flow index (melt mass flow rate, melt flow rate (MFR)) which is greater than or equal to the melt flow index of the thermoplastic material of the wall of the vacuum cleaner filter bag or the melt flow index of the thermoplastic material of the retaining plate, the melt flow index being determined respectively according to ISO 1133-1:2011-12, at a nominal load of 2.16 kg and a temperature of 230 C.

4. The method according to claim 2, wherein the thermoplastic material of the wall of the vacuum cleaner filter bag, the material from which the thermoplastic fibres or the thermoplastic filaments of the textile material are formed or the thermoplastic material of the retaining plate is selected, respectively independently of each other, from the group consisting of polyolefins, poly(meth)acrylates, polyamides, polyesters, thermoplastic elastomers (TPE), polybenzimidazoles, polyether sulphones, polyetheretherketones, polyetherimides, polyphenylene oxides, polyphenylene sulphides and polytetrafluoroethylene and also mixtures, blends or combinations hereof.

5. The method according to claim 1, wherein the textile material is selected from the group consisting of nonwovens, nets, woven materials, knitted materials, fabrics, braided materials, plaited materials, stitchbonded materials and felts and also combinations hereof.

6. The method according to claim 5, wherein the nonwoven is selected from the group consisting of spun nonwovens and crimped nonwovens.

7. The method according to claim 1, wherein the textile material has a planar configuration and in particular a basis weight of 5 to 200 g/m2.

8. The method according to claim 1, wherein the wall of the vacuum cleaner filter bag, at least at the application location of the retaining plate, consists of a film made of a thermoplastic material, a film laminate, in which at least the side on which the retaining plate is applied, made of a thermoplastic material, or is formed from a nonwoven made of a thermoplastic material.

9. The method according to claim 8, wherein, the material of the film or of the side of the film laminate on which the retaining plate is applied is formed from a material which has a melt temperature which is less than or equal to the melting temperature of the thermoplastic material of the retaining plate, the melting temperature being determined respectively according to ISO 11357-3:2011-05, or has a melt flow index (melt mass flow rate, melt flow rate (MFR)), which is greater than or equal to the melt flow index of the thermoplastic material of the retaining plate, the melt flow index being determined respectively according to ISO 1133-1:2011-12, at a nominal load of 2.16 kg and a temperature of 230 C.

10. The method according to claim 1, comprising welding or adhering: a) the integral, frictional or form-fitting connection, at least in regions, of the wall of the vacuum cleaner filter bag to the textile material, b) the integral, frictional or form-fitting connection, at least in regions, of the retaining plate to the textile material, or c) the concluding production of the integral connection between the wall of the vacuum cleaner filter bag, the textile material and the retaining plate.

11. The method according to claim 1, wherein the wall of the vacuum cleaner filter bag, in the region of the application location, has a bag inlet opening, the textile material a through-opening, and the retaining plate and an inlet opening, the method comprising aligning the bag inlet opening, the through-opening and the inlet opening one above the other, or in the wall of the vacuum cleaner filter bag, in the region of the application location, there is introduced a bag inlet opening and in the textile material, a through-opening, the method comprising aligning the bag inlet opening, and the through-opening one above the other and with an inlet opening of the retaining plate.

12. The method according to claim 11, wherein the bag inlet opening or the through-opening are dimensioned smaller than or of equal size in diameter to the inlet opening.

13. The method according to claim 1, wherein at the application location of the retaining plate on the inside of the wall of the vacuum cleaner filter bag, at least one planar sealing element is introduced between the wall of the vacuum cleaner filter bag and the textile material or between the textile material and the retaining plate, the planar sealing element having a through-opening which is in alignment with the through-opening of the retaining plate, wherein the through opening of the planar sealing element has a smaller diameter than the diameter of the through-opening of the retaining plate.

14. The method according to claim 1, wherein an abutment side of the retaining plate is structured, at least in regions, or has energy directors for ultrasound, or when the wall of the vacuum cleaner filter bag, at least in the region of the application location of the retaining plate, is configured as a film or as a film laminate, the film or the film laminate is structured at least at the application location.

15. A method for integral connection of a retaining plate to a wall of a vacuum cleaner filter bag at an application location provided for this purpose, the method comprising: a) in regions in the region of the application location of the retaining plate, at least in regions, producing an integral, frictional or form-fitting connection of the wall of the vacuum cleaner filter bag to at least one layer of a film made of a thermoplastic material, and pressing the retaining plate onto a side, provided with the film, of the wall of the vacuum cleaner filter bag, at the application location, or b) in regions on the retaining plate, at least in regions, producing an integral, frictional or form-fitting connection of the retaining plate to at least one layer of a film made of a thermoplastic material, and pressing the retaining plate with the side, provided with the film, onto the wall of the vacuum cleaner filter bag, at the application location, or c) between the wall of the vacuum cleaner filter bag and the retaining plate, in regions, in the region of the application location of the retaining plate, introducing at least one layer of a film made of a thermoplastic material, and pressing the retaining plate together with the film onto the wall of the vacuum cleaner filter bag, at the application location, and subsequently producing an integral connection between the wall of the vacuum cleaner filter bag, the film and the retaining plate.

16. A method for integral connection of a retaining plate to a wall of a vacuum cleaner filter bag at an application location, the method comprising: applying the retaining plate to at least a side of the wall of the vacuum cleaner filter bag, wherein the wall of the vacuum cleaner filter bag, at least in a region of the application location, consists of or is formed from, a film, a thermoplastic material or, a film laminate having a melting temperature which is less than or equal to, preferably less than the melting temperature of the thermoplastic material of the retaining plate, the melting temperature being determined respectively according to ISO 11357-3:2011-05, or having a melt flow index (melt mass flow rate, melt flow rate (MFR)), which is greater than or equal to the melt flow index of the thermoplastic material of the retaining plate, the melt flow index being determined respectively according to ISO 1133-1:2011-12, at a nominal load of 2.16 kg and a temperature of 230 C.

17. A vacuum cleaner filter bag comprising a wall with an application location for a retaining plate, and also the retaining plate which is connected integrally to the wall at the application location and is connected to the wall, at least in regions, via at least one layer of a textile material or layer of a film made of a thermoplastic material.

18. The vacuum cleaner filter bag according to claim 17, wherein the wall of the vacuum cleaner filter bag, at least at the application location of the retaining plate, is formed from a film made of a thermoplastic material, from a film laminate, in which at least the side on which the retaining plate is applied, made of a thermoplastic material or from a nonwoven made of a thermoplastic material.

19. The vacuum cleaner filter bag according to claim 17, wherein the wall of the vacuum cleaner filter bag, in the region of the application location, has a bag inlet opening, the textile material a through-opening and the retaining plate an inlet opening, the bag inlet opening, the through-opening and the inlet opening being brought into alignment one above the other, wherein the bag inlet opening or the through-opening is dimensioned smaller than or of equal size in diameter to the inlet opening.

20. The vacuum cleaner filter bag according to claim 17, wherein at the application location of the retaining plate on an inside of the wall of the vacuum cleaner filter bag, at least one planar sealing element is introduced between the wall of the vacuum cleaner filter bag and the textile material or between the textile material and the retaining plate, the planar sealing element has a through-opening which is in alignment with the through-opening of the retaining plate, wherein the through-opening of the planar sealing element has a smaller diameter than the diameter of the through-opening of the retaining plate.

21. The vacuum cleaner filter bag according to claim 17, wherein the wall of the vacuum cleaner filter bag, at least in the region of the application location, consisting of or being formed from, the film, the thermoplastic material, or a film laminate, in which at least the side on which the retaining plate is applied, the thermoplastic material, the thermoplastic material of the film or of the film laminate having a melting temperature which is less than or equal to the melting temperature of the thermoplastic material of the retaining plate, the melting temperature being determined respectively according to ISO 11357-3:2011-05, or having a melt flow index (melt mass flow rate, melt flow rate (MFR)), which is greater than or equal to the melt flow index of the thermoplastic material of the retaining plate, the melt flow index being determined respectively according to ISO 1133-1:2011-12, at a nominal load of 2.16 kg and a temperature of 230 C.

Description

(1) The present invention is explained in more detail with reference to the subsequent Figures without the present invention being restricted however to the specially illustrated embodiments.

(2) There are hereby shown

(3) FIG. 1 a first variant for the production of a vacuum cleaner filter bag according to the invention,

(4) FIG. 2 a second variant of a vacuum cleaner filter bag according to the invention and also

(5) FIG. 3 a third variant for the production of a vacuum cleaner filter bag according to the invention.

(6) FIG. 1 shows a first method according to the invention for the production of a wall according to the invention for a vacuum cleaner filter bag, which wall has an inlet opening. In the first step, which is illustrated in FIG. 1a), a wall 1 of a vacuum cleaner filter bag is prepared. The wall can thereby be for example a nonwoven material or else a film. Likewise laminates made of nonwovens or films are conceivable. These materials can be prepared for example as rolled goods and be wound endlessly. In FIG. 1 a) (as also in all the subsequent Figures), only a small section of the material of the wall 1 of the vacuum cleaner filter bag is illustrated.

(7) FIG. 1b) shows the state after a textile material 2 was applied by means of four separate individual weld points 3 on one side of the wall 1 of the vacuum cleaner filter bag. The remaining area of the textile material 2 is thereby loose and not connected to the wall of the filter bag. Alternatively to the individual weld points 3, also gluing, at points, of the textile material 2 to the wall 1 of the vacuum cleaner filter bag can be effected. Likewise, it is also possible to undertake full-area connection, by means of welding or gluing of the textile material 2 to the wall 1 of the vacuum cleaner filter bag.

(8) In the structure produced in FIG. 1b), subsequently (see FIG. 1c)), a common opening (bag inlet opening 4 in the textile material 2 and also through-opening 4 in the textile material 2) is introduced. Introduction of this opening can be effected for example by mutual punching, cutting or similar processes.

(9) FIG. 1d) shows the state after which a retaining plate 5 with an associated inlet opening 6 was applied in alignment on the common opening (4, 4) of the composite made of wall 1 of the filter material and textile material 2. It is thereby detectable that the through-opening 6 of the retaining plate 5 has a larger diameter than the common opening (4, 4) of the wall of the filter bag and of the textile material. This excess which is visible inside the inlet opening of the retaining plate, thereby acts as seal for a connection piece of a vacuum cleaner which is to be introduced through the inlet opening 6 of the retaining plate 5.

(10) The common connection between retaining plate 5 to the wall 1 of the vacuum cleaner filter bag via the textile material 2 is effected for example by an ultrasonic welding process in which ultrasound is introduced into the retaining plate by means of sonotrode and anvil. The weld seam can thereby be configured for example annularly about the inlet opening 6 of the retaining plate 5, however it is likewise possible to weld the retaining plate 5 only at points over the textile material 2 to the wall 1 of the vacuum cleaner filter bag. It is likewise possible to weld the retaining plate 5 over the entire area of the textile material 2 to the wall 1 of the vacuum cleaner filter bag.

(11) Both the wall 1, the textile material 2 and also the retaining plate 5 are formed, in this example, from thermoplastic materials.

(12) FIG. 2 shows a further embodiment for the production of a vacuum cleaner filter bag according to the invention.

(13) The illustrated steps are thereby essentially identical to the step sequence which was presented in FIG. 1.

(14) The only and substantial difference from the embodiment according to FIG. 1 is thereby that the textile material is dimensioned smaller. In the case of the example of FIG. 2, the textile material is thereby fixed to the wall 1 of the vacuum cleaner filter bag merely via two points 3 (for example via welding or gluing).

(15) As a result of the smaller dimensioning, the textile material 2 does not overlap the bag inlet opening 4 which, in FIG. 2c), is now introduced merely into the wall of the vacuum cleaner filter bag.

(16) By covering the retaining plate 5, the inlet opening of the retaining plate 6 being likewise made congruent and in alignment with the bag inlet opening 4, the retaining plate 5 abuts, only more in regions, on the textile material 2. In the concluding production of a connection of the retaining plate by means of the textile material 2 to the wall 1 of the vacuum cleaner filter bag (for example via a welding process), merely its region is hence particularly reinforced by the textile material 2 being present. This is adequate for example with already known tensile load on the vacuum cleaner filter bag.

(17) FIG. 3 shows a further embodiment of a method according to the invention for the production of a vacuum cleaner filter bag according to the invention. FIG. 3a) is thereby identical to FIG. 1a) or FIG. 2a). In the case of the example of FIG. 3, the material of the wall of the vacuum cleaner filter bag is thereby configured as nonwoven.

(18) In a first step, which is illustrated in FIG. 3b), now a recess A is introduced into the wall 1 of the vacuum cleaner filter bag. This can be effected for example by stamping out or cutting out.

(19) As is illustrated in FIG. 3c), now on the rear-side of the wall 1 of the vacuum cleaner filter bag illustrated in perspective, a thermoplastic film F fixes the recess A overlapping at the wall 1 of the vacuum cleaner filter bag, for example by welding or gluing.

(20) Subsequently, as illustrated in FIGS. 3d), a textile material 2 is fixed on the film F, for example by means of four weld points 3 viewed from the front-side in perspective.

(21) The concluding steps e) and f) are thereby essentially identical to the embodiments which were presented already with respect to FIG. 1c) or 1d).

(22) Common introduction of an opening through all the material layers, i.e. viewed from above, textile material 2, the wall of the vacuum cleaner filter bag 1 and also the film F situated behind, is also hereby effected.

(23) After applying the retaining plate 5 with the inlet opening 6, fixing of the retaining plate by the textile material 2 to the film F which in this region forms the wall 1 of the vacuum cleaner filter bag is effected.