EP3178360A1 - Method for forming a strong connection between a holding plate and the wall of a vacuum cleaner filter bag and vacuum cleaner filter bag - Google Patents

Abstract

The present invention relates to methods for producing an improved cohesive composite of a holding plate with the wall of a vacuum cleaner filter bag.

Description

The present invention relates to methods for producing an improved cohesive composite of a holding plate with the wall of a vacuum cleaner filter bag. According to a first variant, the holding plate is not applied directly to the wall of the vacuum cleaner filter bag, but arranged between the holding plate and the wall, a textile material. The composite of the holding plate and the wall of the vacuum cleaner filter bag takes place via the textile material. According to a second variant, a film of a thermoplastic material between the wall of the vacuum cleaner filter bag and retaining plate is partially arranged between the holding plate and the wall of the vacuum cleaner filter bag. The composite of the holding plate and the wall of the vacuum cleaner filter bag takes place via the film. According to a third variant, the holding plate is connected directly to the wall of the vacuum cleaner filter bag. The wall is at least in the area in which the holding plate is applied, as a film made of special thermoplastic materials. The present invention also relates to vacuum cleaner filter bags in which the holding plate is materially connected to the wall of the vacuum cleaner filter bag according to the above principles.

In the case of vacuum cleaner filter bags which consist or have a partial area of a thermoplastic film, it may be necessary to attach a retaining plate in this area. Typically, the connection of a vacuum cleaner bag holding plate to the nonwoven fabric of a filter bag is by gluing by means of a thermally activated adhesive (e.g., hot melt) or by ultrasonic welding. Because of the short welding time and the high strength and process reliability of the welded joint, this is preferably used. Directional sensors on the holding plate as well as structuring on the sonotrode or on the anvil further increase the performance of the ultrasonic welding.

The ultrasonic welding of a holding plate with a film, however, proves to be surprisingly difficult. The maximum tensile forces achieved are unsatisfactory, direction sensors often even lead to worse results than the welding with flat, smooth holding plates with the film and the structuring of sonotrode or anvil hardly improves the result.

So far not yet solved is the problem, a reliable composite, in particular by welding the holding plate to the wall of the filter bag, especially if it consists of foil to produce. The welding can be further complicated if the holding plate has a mechanism for automatically closing a flap when removed from the vacuum cleaner. These mechanisms have different metallic springs anchored in the retaining plate. In the area of these often positive anchors are high material thicknesses precede the ultrasonic line. The spring itself often leads to an unwanted distribution of ultrasound in the workpiece so that at the actually desired Verschweißposition not enough energy is available.

The object of the present invention is therefore to provide reliable methods for connecting a holding plate to the wall of a vacuum cleaner filter bag, with which the aforementioned disadvantages can be avoided. In particular, the bond between the holding plate and the wall of the filter bag should be easy to implement, the composite produced should withstand high tensile loads, as well as the results obtained should be reproducible. In addition, it is an object of the present invention to provide corresponding vacuum cleaner filter bag.

This object is achieved in each case with the method for materially connecting a retaining plate to the wall of a vacuum cleaner filter bag with the features of claims 1, 15 and 16, with respect to vacuum cleaner filter bag with the features of claim 17, 21 and 22. The respective dependent claims are advantageous developments.

The invention thus relates according to a first aspect of a method for materially connecting a retaining plate to the wall of a vacuum cleaner filter bag. The wall of the vacuum cleaner filter bag in this case has a space provided for the attachment of the holding plate. Depending on the configuration of the vacuum cleaner filter bag to be produced later from the wall of the vacuum cleaner filter bag, this location can be located at different locations.

According to a first variant of this aspect, it is provided that at least partially in the region of the mounting location of the retaining plate at least in areas a material, non-positive or positive connection of the wall of the vacuum cleaner filter bag is made with at least one, in particular exactly one layer of textile material, and Holding plate is pressed against the provided with the textile material side of the wall of the vacuum cleaner filter bag at the mounting location. Subsequently, a cohesive bond between the wall of the vacuum cleaner filter bag, the textile material and the holding plate is produced.

According to this first variant of the first aspect of the invention, first at least one layer of a textile material, for example a single layer of a textile material applied to the mounting location of the holding plate on the wall of the vacuum cleaner filter bag and connected there at least partially with the wall of the vacuum cleaner filter bag.

The location of attachment is understood to be the area of the wall of the vacuum cleaner filter bag on which the holding plate is later arranged, i. the area of the wall defined in projection on the wall from the outline of the retaining plate.

The application of the textile material can be carried out only in areas of the mounting location, so that only a part of the surface on which the holding plate is arranged later, is provided with a textile material. This embodiment is particularly useful if it is sufficient only as a punctual or regional reinforcement of the composite of the holding plate with the wall of the vacuum cleaner filter bag. For reinforcement, one or more strips of textile material may be sufficient. In particular, the area of the composite, e.g. the welding, which experiences the highest stress.

It is also possible to provide the entire surface defining the mounting location of the retaining plate with a textile material.

It is also possible to choose the surface of the textile material larger than the surface of the mounting location, so that after connecting the retaining plate with the wall textile material protrudes below the retaining plate.

The at least partially connection of the textile material with the wall, for example, by selective welding, selective bonding, but also via mechanical permanent or temporary fixings, such as clamp connections, etc. happen. After the textile material has been fixed at the intended location on the wall of the vacuum cleaner filter bag according to the above procedure, the holding plate is pressed onto the textile material so that at least part of the surface of the holding plate comes to rest on the textile material. It is also possible that the entire surface of the holding plate is adapted to the textile material, in the event that the selected surface of the textile material is correspondingly large, ie at least as large as the base surface of the retaining plate.

Finally, the production of a cohesive bond between the wall of the vacuum cleaner filter bag and the holding plate through the textile material therethrough. This can be done for example by welding, in particular ultrasonic welding or by gluing. In the latter case, for example, before applying the holding plate to the textile material either on the textile material, the holding plate or the textile material and the holding plate, an adhesive is abandoned.

A second variant of the first aspect of the invention provides that, at least in some areas, a material, non-positive or positive connection of the holding plate with at least one, in particular exactly one layer of a textile material is produced on the holding plate, and the holding plate with the the textile material side provided at the mounting location is pressed against the wall of the vacuum cleaner filter bag. Here, too, the production of a cohesive bond between the wall and the textile material takes place in the manner described above.

In contrast to the first variant discussed above, in the second variant presented here, the textile material is at least partially fixed thereto at least in areas of the holding plate, the holding plate is then pressed together with the at least partially fixed textile material at the mounting location on the wall of the vacuum cleaner filter bag and through the textile material connected to this.

The textile material can be applied, for example, only in areas of the holding plate, for example, such that the textile material does not fill the entire surface of the holding plate, or that an edge of the holding plate is dominated by the textile material, but not the entire surface of the holding plate, the later tied to the wall, covered by textile material. It is also possible that the textile material covers the entire surface of the holding plate, also such that a supernatant of the textile material beyond the edge of the holding plate is made. In the event that the retaining plate has an inlet opening for a vacuum cleaner, can be introduced into the textile material - in the event that it is so arranged on the holding plate that the input opening is partially or completely covered - a passage opening in the textile material before or after application to the holding plate , The introduction of the passage opening is also possible after making the composite of the holding plate with the wall of the vacuum cleaner filter bag.

The bonding of the textile material to the holding plate can be carried out analogously to the embodiments for connecting the textile material to the wall according to the first variant, i. as well, for example, by selective welding, selective bonding, but also on mechanical permanent or temporary fixings, such as clamp connections, etc. In addition, this gives the possibility to mold the textile material already during the manufacturing process of the holding plate with this. In particular, when the holding plate is produced by injection molding, the textile material may be e.g. already introduced into the injection mold and thus directly connected to the holding plate during the injection molding process.

The bonding of the holding plate provided with the textile material is otherwise identical to the first variant, d. H. Here too, a corresponding bonding or welding of the retaining plate to the wall can be made via the textile material.

According to a third variant of the first aspect of the method according to the invention, it is provided that at least partially, in particular exactly one layer of a textile material is introduced between the wall of the vacuum cleaner filter bag and the holding plate in the region of the mounting location of the holding plate, the holding plate together with the textile material on Attachment is pressed against the wall of the vacuum cleaner filter bag. Here too, finally, a cohesive bond between the wall and retaining plate on the textile material. According to this variant, the textile material is introduced without prior fixing between the wall and retaining plate, for example, inserted at the intended location, there is only a single binding process in which the retaining plate through the textile material is connected to the wall of the vacuum cleaner filter bag.

In this third variant as well, the textile material can be applied only in regions of the mounting location, so that only part of the surface on which the retaining plate is later disposed is provided with a textile material. It is also possible to provide the entire surface defining the mounting location of the retaining plate with a textile material. It is also possible to choose the surface of the textile material larger than the surface of the mounting location, so that after connecting the retaining plate with the wall textile material protrudes below the retaining plate.

Surprisingly, it was found that when producing a bond between a holding plate and a wall of a vacuum cleaner filter bag is a significant improvement in the welding result is recorded. In particular, it was found that the maximum tensile force that can be significantly increased for the demolition of the connected plate from the wall of the vacuum cleaner filter bag. This can be observed in particular if the wall of the vacuum cleaner filter bag is formed of a film at least in the region where the attachment of the holding plate takes place or is to take place.

A preferred embodiment provides that the wall of the vacuum cleaner filter bag at least in the region of the mounting location of the holding plate comprises a thermoplastic material or consists thereof or is formed. Preferred thermoplastic materials which are suitable for the wall of the vacuum cleaner filter bag in this case are polyolefins, in particular polyethylene, polypropylene or polystyrene, polyesters, in particular PET, PBT, PC or PLA, thermoplastic elastomers, in particular TPE-O, TPE-V, TPE U, TPE-E, TPE-S or TPE-A, poly (meth) acrylates, polyamides, polybenzimidazoles, polyethersulfones, polyetheretherketones, polyetherimides, polyphenylene oxides, polyphenylene sulfides and polytetrafluoroethylene and mixtures, blends or combinations thereof. The wall of the vacuum cleaner filter bag can be formed, for example, as a film or as a nonwoven fabric at least in the region of the mounting location of the holding plate.

It is likewise preferred if the textile material comprises or consists of thermoplastic fibers and / or thermoplastic filaments.

The thermoplastic fibers or filaments of the textile material can be formed from the identical or different materials that were previously mentioned for the wall of the vacuum cleaner filter bag.

Furthermore, it is advantageous if at least the support side of the holding plate at least partially comprises a thermoplastic material or consists entirely of a thermoplastic material or is formed or the entire holding plate consists of a thermoplastic material or is formed.

Also for the purposes of the holding plate, in particular, the thermoplastic materials mentioned above standing for the wall of the vacuum cleaner filter bag come into question. The materials of the holding plate may represent the same or different materials that are used for the wall of the vacuum cleaner filter bag or the textile material.

According to a particularly preferred embodiment, the thermoplastic fibers and / 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, preferably smaller, more preferably smaller by at least 10 ° C, in particular by at least 20 ° C, than the melting temperature of the thermoplastic material of the wall of the vacuum cleaner filter bag and / or as the melting temperature of the thermoplastic material Holding plate, wherein the melting temperature is determined in each case according to ISO 11357, and / or
has a melt flow rate (MFR) which is greater than or equal to, preferably greater, more preferably by a factor of 5 to 20, greater than the melt flow index of the thermoplastic material of the wall of the vacuum cleaner filter bag and / or the melt flow index of the thermoplastic Material of the holding plate, the melt flow index each determined according to ISO 1133, with a nominal load of 2.16 kg and a temperature of 230 ° C. These parameters for determining the melt flow index may need to be adjusted depending on the thermoplastics used. What is important is that only MFIs that have been determined with the same parameters are compared. The temperature is set at very different plastics (eg PP and TPE) such that both plastics are melted at this temperature. The rated load is determined in such a way that the discharge rate for both melts lies within a clearly measurable range. These adjustments are familiar to any person skilled in the art.

The thermoplastic materials of the textile material thus melt rather, i. at lower temperatures than the thermoplastic materials of the wall and / or the holding plate and / or are less viscous at the same temperature. By the honor melting and / or the low viscosity of the melt of these materials improved wetting of the wall and the holding plate is effected in particular in a welded joint, so that a more significant improvement of the bond between the holding plate and the wall of the vacuum cleaner filter bag is observed.

As a particularly preferred thermoplastic material for the wall of the vacuum cleaner filter bag are polyolefins, in particular polypropylene or polyethylene, polyester or - in the case that the wall is formed at least at the mounting location as a film laminate - thermoplastic polymers, in particular TPE or TPU as the holding plate facing layer of this laminate to call.

As materials for the holding plate find in particular polyolefins, such as polypropylene or polyethylene or polyester, in particular PET use.

The materials which are particularly suitable for the textile material are preferably thermoplastic elastomers, such as TPE or TPU. However, it is also possible that the textile material is formed from the same thermoplastics as the holding plate or the wall, in this case, however, it is preferred as described above, when the thermoplastic material has a lower melting point. In the case where, for example, both wall, retaining plate and textile material are formed from PP, it is advantageous to use a PP grade for the textile material which has a lower melting point and / or a higher MFI, such as the PP Varieties used for holding plate and wall.

According to a preferred embodiment, the textile material is selected from the group consisting of nonwovens, nets, woven, knitted, laid, knitted, braided, stitched and felts, and combinations thereof. Particular preference is given here to nonwovens and nets (nettings), with nonwovens in particular spunbonded nonwovens and carded webs being preferred.

According to a further preferred embodiment, that the textile material is formed flat and in particular a basis weight of 5 to 200 g / m ² , preferably 10 to 100 g / m ² , particularly preferably 15 to 50 g / m ² .

The advantages of the present invention are particularly useful when the wall of the vacuum cleaner filter bag, at least in the area in which the holding plate is to be fixed, as a film of a thermoplastic material, a film laminate, wherein at least the side to which the holding plate applied is made of a thermoplastic material, or is formed of a nonwoven fabric of a thermoplastic material.

It is particularly advantageous in this case if the thermoplastic material of the film or of the side of the film laminate to which the holding plate is applied is formed from a material which
has a melting temperature which is less than or equal to, preferably smaller, more preferably smaller by at least 10 ° C, in particular by at least 20 ° C, than the melting temperature of the thermoplastic material of the holding plate (5), wherein the melting temperature is determined according to ISO 11357, and / or
has a melt flow rate (MFR) which is greater than or equal to, preferably greater, more preferably greater by a factor of 5 to 20 is, as the melt flow index of the thermoplastic material of the holding plate (5), wherein the melt flow index is determined in each case according to ISO 1133, with a nominal load of 2.16 kg and a temperature of 230 ° C.

Due to the smooth surface of the film, it is difficult to securely weld a retaining plate to the film. It is assumed that in particular during the welding process no complete wetting of the film or the film laminate can take place. Surprisingly, the wetting, in particular of the film or of the film laminate, can be improved if a textile material is arranged between the holding plate and the film or film laminate. Particularly preferred here is when the textile material itself consists of a thermoplastic material, in particular of a thermoplastic elastomer and, for example, also melts during the welding process. As a result, a significantly better wetting of the film can be achieved, so that the resulting maximum tensile force that can act on the holding plate before partial or complete demolition of the holding plate, can be significantly improved.

In particular, it is preferred if the material, force or form-fitting connection of the wall of the vacuum cleaner filter bag with the textile material, at least in regions,
at least partially material, non-positive or positive connection joining the holding plate with the textile material, and / or
the final production of the cohesive bond between the wall of the vacuum cleaner filter bag, the textile material and the holding plate
by means of a welding operation, in particular an ultrasonic welding process or by means of adhesive bonding, in particular by means of a liquid adhesive, a 2K adhesive or a thermally liquefiable adhesive.

According to the present invention, it is possible, in each case in the wall of the vacuum cleaner filter bag, a bag inlet opening or in the textile material to introduce a passage opening and the respective openings in the various variants of the above-mentioned method in alignment with To cover. Also included in the holding plate inlet opening into which, for example, a vacuum cleaner can be inserted, is arranged in this case in alignment with the bag inlet opening and the passage opening.

In particular, in the initially mentioned variant of the method according to the invention, it is preferred to first produce an at least partially composite of the textile material with the wall of the vacuum cleaner filter bag at the attachment of the holding plate and in a subsequent step, for example by means of a punching process, at the same time a congruent bag inlet opening in the Wall of the vacuum cleaner filter bag and introduce a passage opening in the textile material. Subsequently, the holding plate can then be applied with its inlet opening in alignment with the passage opening of the textile material.

The geometric shape of the textile material may depend on the weld geometry to be achieved. Typically, the weld is round and has a width of a few mm to cm. So it is sufficient to position a corresponding ring of textile material between the film and the holding plate and to connect with the known ultrasonic welding process with film and holding plate in one step.

In principle, it is also possible to first fix the textile material lightly on the holding plate or on the film and then process it in a second step (ultrasonic welding).

The textile material may, for. B. may be formed as a material strip, which may also be wider than the desired weld to facilitate positioning.

The bag inlet opening of the wall of the vacuum cleaner filter bag and / or the passage opening of the textile material can be dimensioned smaller or equal in diameter, as the input opening of the holding plate.

This embodiment provides that either the bag inlet opening of the wall of the vacuum cleaner filter bag, or the passage opening of the textile material, or the bag inlet opening of the wall of the vacuum cleaner filter bag and the passage opening of the textile material are dimensioned smaller in diameter than the input opening of the holding plate. By this resulting projection in the direction of the recess (filling hole) while a seal is formed, which can be sealed via the inlet opening of the holding plate into the interior of the resulting vacuum cleaner filter bag to be introduced nozzle of the vacuum cleaner. In particular, with a smaller dimensioning of the passage opening of the textile material (and possibly also the bag inlet opening of the wall of the vacuum cleaner filter bag) in this case a good sealing effect is observed. In this case, for example, in the region of this resulting projection, the textile material may additionally be connected to the wall of the vacuum cleaner filter bag, for example welded. However, it is also possible to leave the textile material in this area unconnected to the wall of the vacuum cleaner filter bag.

Also, it is also possible to process an additional seal, for example, a flat sealing element in the inventive production of cohesive composite with.

For this purpose, it is preferred if at least one planar sealing element is introduced at the mounting location of the retaining plate on the inside of the wall of the vacuum cleaner filter bag, between the wall of the vacuum cleaner filter bag and the textile material and / or between the textile material and the retaining plate, preferably of TPE or TPU is formed and having a passage opening which is arranged in alignment with the passage opening of the holding plate, but has a smaller diameter than the diameter of the passage opening of the holding plate.

It is further preferred if the support side of the holding plate is at least partially structured and / or has directional sensors for ultrasound. A direction sensor may be formed, for example, as a raised groove on the mounting side of the retaining plate.

Alternatively or in addition to this, it is also possible for the film or the film laminate to be structured at least at the mounting location, in particular high-low, in the case where the wall of the vacuum cleaner filter bag is designed as a film or as a film laminate, at least in the region of the attachment location of the retaining plate. structured, such as is knurled.

Additionally or alternatively, the film used may also be a laminate of two different thermoplastics. The more easily activated by ultrasound layer of the laminate points to the holding plate. For example, if this layer is a TPE and the retaining plate with the in the EP2311358 A1 equipped TPE welding aid is a particularly good connection is achieved. Also in this case, the additional introduction of a textile material is further advantageous.

A further particularly preferred embodiment provides that, at least in regions, a thermoplastic elastomer, at least in the mounting location of the retaining plate on the wall and / or on the side facing the wall of the textile material and / or on the side of the textile material facing the retaining plate, such as in particular TPE-O, TPE-V, TPE-U, TPE-E, TPE-S or TPE-A is applied, e.g. via a printing process, in particular by means of functional screen printing. The thermoplastic elastomer may e.g. be applied in the form of nubs or concentric circles on the respective surface.

According to a second aspect, the present invention relates to a further method for integrally connecting a retaining plate to the wall of a vacuum cleaner filter bag at a mounting location provided therefor. In contrast to the first aspect, in this case no textile material is used between the holding plate and the wall to reinforce the composite, but a foil of a thermoplastic material which is used only in one region of the mounting location. According to the first aspect, the second aspect of the method according to the invention is also designed in three variants.

According to a first variant, in some areas in the region of the mounting location of the retaining plate, at least in regions, a material, non-positive or positive fit Composite of the wall of the vacuum cleaner filter bag with at least one, in particular exactly one layer of a film made of a thermoplastic material, the holding plate pressed against the provided with the film side of the wall of the vacuum cleaner filter bag at the mounting location and then a cohesive bond between the wall of the vacuum cleaner filter bag, the film and the holding plate made.

According to a second variant, at least in regions, a material, non-positive or positive connection of the holding plate with at least one, in particular exactly one layer of a film made of a thermoplastic material is partially made on the support plate, and the holding plate with the side provided with the film Attachment pressed against the wall of the vacuum cleaner filter bag and then made a cohesive bond between the wall of the vacuum cleaner filter bag, the film and the holding plate.

According to a third variant, at least one, in particular exactly one layer of a film made of a thermoplastic material is introduced between the wall of the vacuum cleaner filter bag and the holding plate in regions in the region of attachment of the holding plate, the holding plate pressed together with the film at the mounting location on the wall of the vacuum cleaner filter bag and Subsequently, a cohesive bond between the wall of the vacuum cleaner filter bag, the film and the holding plate produced.

It must be ensured that in the production of the final bond between wall, foil and retaining plate, the composite is produced at least in the region in which the foil is present.

Surprisingly, it was also found in this aspect of the invention that when producing a bond between a holding plate and a wall of a vacuum cleaner filter bag, a significant improvement in the welding result is recorded. In particular, it was found that the maximum tensile force that can be significantly increased for the demolition of the connected plate from the wall of the vacuum cleaner filter bag. This is especially noticeable when the wall the vacuum cleaner filter bag is formed of a film at least in the region where the attachment of the holding plate takes place or should take place.

Preferably, the film is formed from a thermoplastic material which has a melting temperature which is less than or equal to, preferably smaller, more preferably smaller by at least 10 ° C, in particular by at least 20 ° C, than the melting temperature of the thermoplastic material of the wall of the Vacuum cleaner filter bag and / or as the melting temperature of the thermoplastic material of the holding plate (5), wherein the melting temperature is determined in each case according to ISO 11357, and / or
a melt flow rate (MFR), which is greater than or equal to, preferably greater, more preferably by a factor of 10 to 20 greater than the melt flow index of the thermoplastic material of the wall (1) of the vacuum cleaner filter bag and / or as the Melt flow index of the thermoplastic material of the holding plate (5), wherein the melt flow index is determined according to ISO 1133, with a nominal load of 2.16 kg and a temperature of 230 ° C.

The materials that can be used in particular for the film according to a preferred embodiment correspond to the materials that have been mentioned as preferred materials for the above-mentioned textile materials.

Preferably, the film which is introduced between the holding plate and the wall, thereby formed as a material strip.

More preferably, the film is not arranged in the region of the inlet opening of the holding plate or the bag inlet opening of the wall of the vacuum cleaner filter bag, but preferably in the edge region of the mounting location of the holding plate.

The region in which the film is arranged, makes preferably 5 to 70%, more preferably 10 to 50%, particularly preferably 15 to 25% of the surface of the mounting location of the holding plate.

The introduced between the wall and retaining plate film can be continuously formed or slotted and / or perforated.

A further particularly preferred embodiment provides that at least in the mounting location of the holding plate on the wall and / or on the side facing the wall of the film and / or on the side facing the holding plate of the film at least partially a thermoplastic elastomer, such. in particular TPE-O, TPE-V, TPE-U, TPE-E, TPE-S or TPE-A is applied, e.g. via a printing process, in particular by means of functional screen printing. The thermoplastic elastomer may e.g. be applied in the form of nubs or concentric circles on the respective surface.

Incidentally, in particular with regard to the configuration of the wall of the filter bag and the configuration of the holding plate, this second aspect of the invention is identical to the first aspect. For avoiding repetition, reference is made to the above statements made in the first aspect of the invention.

The connection possibilities with which the film can be connected at least in regions to the wall or the holding plate correspond to those which have already been discussed in the first aspect of the present invention. In particular, punctual or full-surface welding or gluing are possible.

The final production of the composite between wall, foil and retaining plate takes place analogously to the production of the composite between wall, textile material and retaining plate according to the first aspect of the invention.

A third aspect of the present invention relates to another method for integrally bonding a holding plate to the wall of a vacuum cleaner filter bag at a mounting location provided therefor. In contrast to the first and second aspects, no additional material is introduced between the wall and the retaining plate. The retaining plate is connected directly to the wall of the vacuum cleaner filter bag. According to the invention, it is provided in this aspect of the invention that the wall of the vacuum cleaner filter bag at least in the region of attachment as a sheet of a thermoplastic material or as a film laminate, wherein at least the side to which the holding plate is applied consists of a thermoplastic material or is formed wherein the thermoplastic material of the film or the film laminate
has a melting temperature which is less than or equal to, preferably smaller, more preferably smaller by at least 10 ° C, in particular by at least 20 ° C, than the melting temperature of the thermoplastic material of the holding plate, wherein the melting temperature is determined according to ISO 11357, and /or
a melt flow rate (MFR), which is greater than or equal to, preferably greater, more preferably by a factor of 10 to 20 greater than the melt flow index of the thermoplastic material of the holding plate, wherein the melt flow index is determined according to ISO 1133 , at one with a nominal load of 2.16 kg and a temperature of 230 ° C.

Surprisingly, it was also found in this aspect of the invention that when producing a bond between a holding plate and a wall of a vacuum cleaner filter bag, a significant improvement in the welding result is recorded. In particular, it was found that the maximum tensile force that can be significantly increased for the demolition of the connected plate from the wall of the vacuum cleaner filter bag. This can be observed in particular if the wall of the vacuum cleaner filter bag is formed of a film at least in the region where the attachment of the holding plate takes place or is to take place.

The thermoplastic materials of the film or of the holding plate facing side of the film thus melt rather, ie at lower temperatures than the thermoplastic materials of the holding plate and / or are lower viscosity at the same temperature. By the honor melting and / or the low viscosity of the melt of these materials improved wetting of the wall - in this case, the film - and the holding plate is effected in particular in a welded joint, so that a more significant Improvement of the bond between the holding plate and the wall of the vacuum cleaner filter bag is observed.

As a particularly preferred thermoplastic material for the film of the wall of the vacuum cleaner filter bag are polyolefins, in particular polypropylene or polyethylene, polyester or - in the case that the wall is formed at least at the mounting location as a film laminate - thermoplastic polymers, in particular TPE or TPU as the holding plate facing layer to call this laminate.

As materials for the holding plate find in particular polyolefins, such as polypropylene or polyethylene or polyester, in particular PET use.

The materials which are particularly suitable for the backing plate-facing side of the film laminate are preferably thermoplastic elastomers, e.g. TPE or TPU.

However, it is also possible that the film or the film laminate is formed from the same thermoplastics as the holding plate or the wall, in this case, however, it is preferred as described above, when the thermoplastic material has a lower melting point. In the event that e.g. both holding plate and film or the film laminate are formed from PP, it is advantageous to use for the film or the film laminate a PP grade having a lower melting point and / or a higher MFI, such as the PP grades, which are used for retaining plate and wall.

A further particularly preferred embodiment provides that, at least in some areas, a thermoplastic elastomer, such as, in particular, TPE-O, TPE-V, TPE-U, TPE-E, TPE, is applied to the film or the film laminate at least in the mounting location of the holding plate on the wall -S or TPE-A is applied, for example via a printing operation, in particular by means of functional screen printing. The thermoplastic elastomer can be applied, for example, in the form of nubs or concentric circles on the respective surface.

The holding plate can also have a closure flap which projects through the bag inlet opening into the interior of the vacuum cleaner filter bag and by means of which the bag inlet opening can be closed from the inside. This flap can e.g. have a spring by means of a self-closing of the bag inlet opening with the flap is possible.

In addition, the present invention relates to a vacuum cleaner filter bag, comprising a wall with a mounting location for a retaining plate, as well as an attachment at the attachment materially connected to the wall holding plate, which is at least partially connected via at least one, in particular exactly one layer of a textile material with the wall.

According to a preferred embodiment it is provided that the wall of the vacuum cleaner filter bag at least at the mounting location of the holding plate of a film of a thermoplastic material, a film laminate, wherein at least the side to which the holding plate is applied from a thermoplastic material or a nonwoven fabric from a thermoplastic material is formed.

In this case, it is further preferred that the wall of the vacuum cleaner filter bag has a bag inlet opening in the area of the attachment location, the textile material has a passage opening and the holding plate has an inlet opening, wherein the bag inlet opening, through opening and inlet opening are aligned one above the other, in particular that the bag inlet opening and / or the passage opening in Diameter smaller or equal to the size of the inlet opening.

A further preferred embodiment provides that at the mounting location of the holding plate on the inside of the wall of the vacuum cleaner filter bag, between the wall of the vacuum cleaner filter bag and the textile material and / or between the textile material and the holding plate at least one planar sealing element is introduced, preferably made of TPE or TPU is formed and which has a passage opening which is arranged in alignment with the passage opening of the holding plate, but has a smaller diameter than the diameter of the passage opening of the holding plate.

Furthermore, the invention relates to a vacuum cleaner filter bag comprising a wall with a mounting location for a holding plate, and a mounting plate integrally connected to the wall holding plate which is partially connected via at least one, in particular exactly one layer of a film of a thermoplastic material with the wall ,

The vacuum cleaner filter bag according to this variant is substantially identical to the previously mentioned embodiment, except for the fact that the holding plate is connected to the wall of the filter bag via a film, which is provided only partially at the mounting location.

The preferred Druchtrittsöffnung is introduced in this case in the film.

Furthermore, the invention relates to a vacuum cleaner filter bag, comprising a wall with a mounting location for a holding plate, and at the attachment cohesively connected to the wall holding plate, wherein the wall of the vacuum cleaner filter bag, at least in the region of mounting location as a film of a thermoplastic material or as a film laminate, at the at least the side on which the holding plate is applied is or is formed from a thermoplastic material, wherein the thermoplastic material of the film or of the film laminate
has a melting temperature which is less than or equal to, preferably smaller, more preferably smaller by at least 10 ° C, in particular by at least 20 ° C, than the melting temperature of the thermoplastic material of the holding plate (5), wherein the melting temperature is determined according to ISO 11357, and / or
a melt flow rate (MFR), which is greater than or equal to, preferably greater, more preferably by a factor of 10 to 20 greater than the melt flow index of the thermoplastic material of the holding plate (5), wherein the melt flow index is determined in each case according to ISO 1133, one at a nominal load of 2.16 kg and a temperature of 230 ° C.
The vacuum cleaner filter bags according to all embodiments can be made of the walls described above, according to the invention be assembled on known from the prior art manufacturing methods, for example as a flat bag or as a block bottom bag.

The present invention will be explained in more detail with reference to the following figures, but without restricting the present invention to the specifically illustrated embodiments.

Show here

FIG. 1

a first variant for producing a vacuum cleaner filter bag according to the invention,

FIG. 2

a second variant of a vacuum cleaner filter bag according to the invention and

FIG. 3

a third variant for producing a vacuum cleaner filter bag according to the invention.

FIG. 1 shows a first inventive method for producing a wall according to the invention having an inlet opening for a vacuum cleaner filter bag. In the first step, in FIG. 1a ), a wall 1 of a vacuum cleaner filter bag is provided. The wall may be, for example, a nonwoven material or a film. Likewise, laminates of nonwovens or films are conceivable. These materials can be provided, for example, from roll goods and processed endlessly. In FIG. 1a ) (as well as in all subsequent figures), only a small section of the material of the wall 1 of the vacuum cleaner filter bag is shown.

FIG. 1b ) shows the state after a textile material 2 has been applied by means of four separate individual welding spots 3 on one side of the wall 1 of the vacuum cleaner filter bag. The remaining surface of the textile material 2 is loose and not connected to the wall of the filter bag. As an alternative to the individual spot welds 3, it is also possible for the textile material 2 to be adhesively bonded at points to the wall 1 of the vacuum cleaner filter bag. Likewise, it is also possible to perform a full-surface bonding, for example, welding or bonding of the textile material 2 to the wall 1 of the vacuum cleaner filter bag.

In the in FIG. 1b ) is subsequently (see Figure 1c )) introduced a common opening (bag inlet opening 4 in the textile material 2 and passage opening 4 'in the textile material 2). The introduction of this opening can be done for example by common punching, cutting or similar processes.

Figure 1d ) shows the state in which a holding plate 5 with an associated inlet opening 6 has been applied in alignment with the common opening (4, 4 ') of the composite of wall 1 of the filter material and textile material 2. It can be seen that the passage opening 6 of the holding 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 projection, which is visible within the entrance opening of the holding plate, acts as a seal for a through the input port 6 of the holding plate 5 to be introduced nozzle of a vacuum cleaner.

The common bond between the holding plate 5 with the wall 1 of the vacuum cleaner filter bag on the textile material 2, for example, by an ultrasonic welding process, in which ultrasound is introduced into the holding plate by means of sonotrode and anvil. The weld can be performed, for example, annularly around the inlet opening 6 of the holding plate 5, but it is also possible to weld the holding plate 5 only selectively over the textile material 2 with the wall 1 of the vacuum cleaner filter bag. It is also possible to weld the holding plate 5 over the entire surface of the textile material 2 with the wall 1 of the vacuum cleaner filter bag.

Both the wall 1, the textile material 2 and the holding plate 5 are formed in this example of thermoplastic materials.

FIG. 2 shows a further embodiment for producing a vacuum cleaner filter bag according to the invention.

The illustrated steps are essentially identical to the sequence of steps as described in FIG. 1 was presented.

The only and essential difference from the embodiment according to FIG. 1 is that the textile material is smaller in size. In the case of the example FIG. 2 the textile material is fixed only over two points 3 (for example, by welding or gluing) with the wall 1 of the vacuum cleaner filter bag.

Due to the smaller dimensioning, the textile material 2 does not cover the bag inlet opening 4, which is in Figure 2c ) is now introduced only in the wall of the vacuum cleaner filter bag.

When superimposing the holding plate 5, wherein also the input opening of the holding plate 6 is brought into alignment with the bag inlet opening 4, the holding plate 5 is thus only more partially on the textile material 2. During the final production of a composite of the holding plate by the textile material 2 with the wall 1 of the vacuum cleaner filter bag (for example via a welding process), only its area is thus particularly intensified by the textile material 2 being present. This is sufficient, for example, in the case of previously known tensile loading on the vacuum cleaner filter bag.

FIG. 3 shows a further embodiment of a method according to the invention for producing a vacuum cleaner filter bag according to the invention. FIG. 3a ) is identical to FIG. 1a ) or. FIG. 2a ). In the case of the example FIG. 3 In this case, the material of the wall of the vacuum cleaner filter bag is formed as a nonwoven fabric.

In a first step, in FIG. 3b ), a recess A is now introduced into the wall 1 of the vacuum cleaner filter bag. This can be done for example by punching or cutting.

As in Figure 3c ), is now on the perspective shown back of the wall 1 of the vacuum cleaner filter bag, a thermoplastic film F the recess A covering on the wall 1 of the vacuum cleaner filter bag, for example, by welding or gluing, fixed.

Below, as in 3d figures ), is seen from the perspective front, a textile material 2 fixed, for example by means of four welds 3 on the film F.

The final steps e) and f) are essentially identical to the statements already made for Figure 1c ) or 1d).

Here, too, a common introduction of an opening through all of the material layers, d. H. Seen from above the textile material 2, the wall of the vacuum cleaner filter bag 1 and the underlying film F.

After applying the holding plate 5 with the inlet opening 6, a fixing of the holding plate by the textile material 2 takes place with the film F, which forms the wall 1 of the vacuum cleaner filter bag in this area.

Claims (22)

Method for integrally connecting a holding plate (5) to the wall (1) of a vacuum cleaner filter bag at a location provided for this purpose, in which a) at least partially in the region of the mounting location of the holding plate (5) at least in areas a material, non-positive or positive bond (3) of the wall (1) of the vacuum cleaner filter bag with at least one, in particular exactly one layer of a textile material (2) produced is, the holding plate (5) pressed against the textile material (2) provided side of the wall of the vacuum cleaner filter bag at the mounting location, or b) at least partially on the holding plate (5) at least in areas a material, non-positive or positive connection of the holding plate (5) with at least one, in particular exactly one layer of a textile material (2) is produced, and the holding plate (5) pressed with the textile material (2) provided side at the mounting location on the wall (1) of the vacuum cleaner filter bag, or c) between the wall (1) of the vacuum cleaner filter bag and the holding plate (5) at least partially in the region of the mounting location of the holding plate (5) at least one, in particular exactly one layer of a textile material (2) introduced, the holding plate (5) together with the textile material (2) pressed at the mounting location on the wall (1) of the vacuum cleaner filter bag, and then a cohesive bond between the wall (1) of the vacuum cleaner filter bag, the textile material (2) and the holding plate (5) is produced. Method according to claim 1, characterized in that the wall (1) of the vacuum cleaner filter bag comprises or consists of a thermoplastic material at least in the region of the attachment location of the retaining plate (5)
the textile material (2) comprises or consists of thermoplastic fibers and / or thermoplastic filaments, and / or
at least the support side of the holding plate (5) at least partially comprises a thermoplastic material or consists entirely of a thermoplastic material or is formed or the entire holding plate (5) consists of a thermoplastic material or is formed. Method according to the preceding claim, characterized in that the thermoplastic fibers and / or the thermoplastic filaments of the textile material (2) are formed from a material which
has a melting temperature which is less than or equal to, preferably smaller, more preferably smaller by at least 10 ° C, in particular by at least 20 ° C, than the melting temperature of the thermoplastic material of the wall (1) of the vacuum cleaner filter bag and / or as the melting temperature of the thermoplastic material of the holding plate (5), wherein the melting temperature is determined in each case according to ISO 11357, and / or
a melt flow rate (MFR), which is greater than or equal to, preferably greater, more preferably by a factor of 5 to 20 greater than the melt flow index of the thermoplastic material of the wall (1) of the vacuum cleaner filter bag and / or as the Melt flow index of the thermoplastic material of the holding plate (5), wherein the melt flow index is determined according to ISO 1133, with a nominal load of 2.16 kg and a temperature of 230 ° C. Method according to one of the two preceding claims, characterized in that the thermoplastic material of the wall (1) of the vacuum cleaner filter bag, the material from which the thermoplastic fibers and / or the thermoplastic filaments of the textile material (2) are formed and / or the thermoplastic material of the holding plate (5) is in each case independently selected from the group consisting of polyolefins, in particular polyethylene, polypropylene or polystyrene, poly (meth) acrylates, polyamides, polyesters, in particular PET, PBT, PC or PLA, thermoplastic elastomers (TPE), in particular TPE-O, TPE-V, TPE-U, TPE-E, TPE-S or TPE-A, polybenzimidazoles, polyethersulfones, polyetheretherketones , Polyetherimides, polyphenylene oxides, polyphenylene sulfides and polytetrafluoroethylene and mixtures, blends or combinations thereof. Method according to one of the preceding claims, characterized in that the textile material (2) is selected from the group consisting of nonwovens, nets, woven, knitted, laid, knitted, braided, stitched and felts, and combinations thereof. Method according to the preceding claim, characterized in that the nonwoven fabric is selected from the group consisting of spunbonded nonwovens and carded webs. Method according to one of the preceding claims, characterized in that the textile material (2) is formed flat and in particular a basis weight of 5 to 200 g / m ² , preferably 10 to 100 g / m ² , particularly preferably 15 to 50 g / m ² has. Method according to one of the preceding claims, characterized in that the wall (1) of the vacuum cleaner filter bag at least at the mounting location of the holding plate (5) of a film (F) of a thermoplastic material, a film laminate, wherein at least the side on which the holding plate (5) is applied from a thermoplastic material, or is formed from a nonwoven fabric made of a thermoplastic material. Method according to the preceding claim, characterized in that the thermoplastic material of the film or the side of the film laminate to which the holding plate (5) is applied is formed from a material which
has a melting temperature which is less than or equal to, preferably smaller, more preferably smaller by at least 10 ° C, in particular by at least 20 ° C, than the melting temperature of the thermoplastic material of the holding plate (5), wherein the melting temperature is determined according to ISO 11357, and / or has a melt flow rate (MFR), which is greater than or equal to, preferably greater, more preferably by a factor of 5 to 20 greater than the melt flow index of the thermoplastic material of the holding plate (5), wherein the melt flow index is determined according to ISO 1133, with a nominal load of 2.16 kg and a temperature of 230 ° C. Method according to one of the preceding claims, characterized in that a) the at least partially material, non-positive or positive connection of the wall (1) of the vacuum cleaner filter bag with the textile material (2), b) the at least partially material, non-positive or positive connection of the holding plate (5) with the textile material (2), and / or c) the final production of the integral bond between the wall (1) of the vacuum cleaner filter bag, the textile material (2) and the holding plate (5) by means of a welding operation, in particular an ultrasonic welding process or by means of adhesive bonding, in particular by means of a liquid adhesive, a 2K adhesive or a thermally liquefiable adhesive. Method according to one of the preceding claims, characterized in that
the wall (1) of the vacuum cleaner filter bag has a bag inlet opening (4) in the region of the attachment location, the textile material (2) has an entry opening (4) and the holding plate (5) has an entry opening (6), the bag inlet opening (4), through opening (4 ) and input opening (6) are aligned over one another, or in the wall (1) of the vacuum cleaner filter bag in the region of attachment a bag inlet opening (4) and / or in the textile material (2) a passage opening (4) is introduced, and Bag inlet opening (4), passage opening (4) and with an input opening (6) of the holding plate (5) are brought one above the other in alignment. Method according to the preceding claim, characterized in that the bag inlet opening (4) and / or the passage opening (4) are dimensioned to be smaller or equal in diameter than the inlet opening (6). Method according to one of the preceding claims, characterized in that at the mounting location of the holding plate (5) on the inside of the wall (1) of the vacuum cleaner filter bag, between the wall (1) of the vacuum cleaner filter bag and the textile material (2) and / or between the textile Material (2) and the holding plate (5) at least one planar sealing element is introduced, which is preferably made of TPE or TPU and which has a passage opening which is arranged in alignment with the passage opening of the holding plate (5), but a smaller diameter than that Has diameter of the passage opening of the holding plate (5). Method according to one of the preceding claims, characterized in that
the support side of the holding plate (5) is at least partially structured and / or has directional sensors for ultrasound, and / or for the case that the wall (1) of the vacuum cleaner filter bag at least in the region of attachment of the holding plate (5) is formed as a film (F) or as a film laminate, the film (F) or the film laminate structured at least at the mounting location, in particular high deeply textured, such as knurled. Method for integrally connecting a holding plate (5) to the wall (1) of a vacuum cleaner filter bag at a location provided for this purpose, in which a) partially in the region of the mounting location of the holding plate (5) at least in areas a material, non-positive or positive bond (3) of the wall (1) of the vacuum cleaner filter bag with at least one, in particular exactly one layer of a film (F) of a thermoplastic Material is produced, the holding plate (5) pressed against the provided with the film side of the wall of the vacuum cleaner filter bag at the mounting location, or b) in regions on the holding plate (5) at least in areas a material, non-positive or positive connection of the holding plate (5) with at least one, in particular exactly one layer of a film (F) is made of a thermoplastic material, and the retaining plate ( 5) pressed with the film side provided at the mounting location on the wall (1) of the vacuum cleaner filter bag, or c) between the wall (1) of the vacuum cleaner filter bag and the holding plate (5) partially in the region of the mounting location of the holding plate (5) at least one, in particular exactly one layer of a film (F) made of a thermoplastic material, the holding plate (5) together pressed with the film at the mounting location on the wall (1) of the vacuum cleaner filter bag, and then a cohesive bond between the wall (1) of the vacuum cleaner filter bag, the film (F) and the holding plate (5) is produced. Method for integrally connecting a holding plate (5) to the wall (1) of a vacuum cleaner filter bag at a location provided therefor, wherein the wall (1) of the vacuum cleaner filter bag at least in the region of attachment as a film (F) made of a thermoplastic material or as a film laminate, in which at least the side to which the holding plate (5) is applied is made of a thermoplastic material, wherein the thermoplastic material of the film (F) or of the film laminate
has a melting temperature which is less than or equal to, preferably smaller, more preferably smaller by at least 10 ° C, in particular by at least 20 ° C, than the melting temperature of the thermoplastic material of the holding plate (5), wherein the melting temperature is determined according to ISO 11357, and / or
a melt flow rate (MFR), which is greater than or equal to, preferably greater, more preferably by a factor of 5 to 20 greater than the melt flow index of the thermoplastic material of the holding plate (5), wherein the melt flow index is determined in each case according to ISO 1133, with a nominal load of 2.16 kg and a temperature of 230 ° C. Vacuum cleaner filter bag, comprising a wall (1) with a mounting location for a retaining plate (5), as well as a retaining plate (5) connected to the wall (1) at the attachment location, which at least partially has at least one, in particular exactly one, layer of a textile material ( 2) is connected to the wall (1). Vacuum cleaner filter bag according to the preceding claim, characterized in that the wall (1) of the vacuum cleaner filter bag at least at the mounting location of the holding plate (5) of a film (F) of a thermoplastic material, a film laminate, wherein at least the side to which the holding plate (5 ) is formed from a thermoplastic material or from a nonwoven fabric made of a thermoplastic material. Vacuum cleaner filter bag according to one of the two preceding claims, characterized in that the wall (1) of the vacuum cleaner filter bag in the region of attachment a bag inlet opening (4), the textile material has a passage opening (4 ') and the holding plate (5) has an inlet opening (6) in which bag inlet opening (4), passage opening (4 ') and inlet opening (6) are aligned over one another, in particular that the bag inlet opening (4) and / or the passage opening (4') are dimensioned smaller or equal in diameter than the inlet opening ( 6). Vacuum cleaner filter bag according to one of claims 15 to 19, characterized in that at the mounting location of the holding plate (5) on the inside of the wall (1) of the vacuum cleaner filter bag, between the wall (1) of the vacuum cleaner filter bag and the textile material (2) and / or between the textile material (2) and the holding plate (5) at least one planar sealing element is introduced, which is preferably made of TPE or TPU and which has a passage opening which is arranged in alignment with the passage opening (6) of the holding plate (5), however Having a smaller diameter than the diameter of the passage opening (6) of the holding plate (5). Vacuum cleaner filter bag, comprising a wall (1) with a mounting location for a retaining plate (5), as well as a holding plate (5) integrally connected to the wall (1) at the mounting location, which in certain areas has at least one, in particular exactly one, layer of film (F). made of a thermoplastic material with the wall (1) is connected. Vacuum cleaner filter bag, comprising a wall (1) with a mounting location for a holding plate (5), as well as a mounting plate (5) integrally connected to the wall (1), wherein the wall (1) of the vacuum cleaner filter bag at least in the region of the mounting location as a film (F) made of a thermoplastic material or as a film laminate, in which at least the side on which the holding plate (5) is applied or formed from a thermoplastic material, wherein the thermoplastic material of the film (F) or the film laminate
has a melting temperature which is less than or equal to, preferably smaller, more preferably smaller by at least 10 ° C, in particular by at least 20 ° C, than the melting temperature of the thermoplastic material of the holding plate (5), wherein the melting temperature is determined according to ISO 11357, and / or
a melt flow rate (MFR), which is greater than or equal to, preferably greater, more preferably by a factor of 5 to 20 greater than the melt flow index of the thermoplastic material of the holding plate (5), wherein the melt flow index is determined in each case according to ISO 1133, with a nominal load of 2.16 kg and a temperature of 230 ° C.

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