METHOD FOR PRODUCING A FOAM SEALING TAPE AND FOAM SEALING TAPE

Description

[0001] The present invention relates to a method for producing a foam sealing tape and to a corresponding sealing tape. In particular, the invention relates to a sealing tape in the construction sector, for example for sealing facades, frames, and the like, for example against masonry or other building structures, for example for sealing window frames against masonry. Such sealing tapes, also known as multifunctional tapes, can be used, for example, to hermetically separate the corresponding areas to be sealed. It is partly known from the prior art to use combinations of foam, in particular impregnated foam, and membranes. This impregnated foam recovers and thus achieves a sufficient density to fill the gaps to be sealed accordingly. It would be desirable for the membranes to be pressed firmly against the respective joint flanks by the impregnated foam.However, practice has shown that in a retracted state, the expansion of the foam is at least slightly hindered at the very points where the layers are arranged. As a result, the required airtightness values ​​(at least the BG-R according to DIN 18542:2009-07) cannot be achieved in some cases.

[0002] Various sealing tapes and foam sealing tapes are known from the state of the art. These are used, for example, to seal window or door frames or their reveals against masonry.

[0003] In addition, so-called multifunctional tapes are known from the state of the art. Achieving the required airtightness is sometimes difficult or only feasible with a high material input (using strong compression during use).

[0004] Therefore, some efforts in the prior art are to increase the airtightness of such tapes. This often fails because the films used do not fully adhere to the contact surface of the building element to be sealed or to the building structure. It can also happen that a film, such as a membrane, is self-adhesive and, when compressed, compresses together with a foam. The elements stick together and are therefore no longer able to open up any further or expand, meaning they no longer securely seal the element from the building structure. This is particularly difficult when profiles of plastic or metal windows and doors have grooves or webs on their front sides that are intended to enable coupling with other profiles.

[0005] Therefore, foam bodies are also known from the prior art that have a separating layer or a membrane, a film, or the like inside, which ensures the required overall airtightness. Various methods are known for producing such sealing elements. For example, it is known that a slot is made in the foam body, and the sealing element, such as a membrane, is inserted into this slot. Therefore, these prior art methods are sometimes relatively complicated.

[0006] The present invention is therefore based on the object of producing a sealing tape which can be produced in a simpler manner than in the prior art.

[0007] Furthermore, in the prior art, the respective separating layers typically run perpendicular to the direction of extension of the tape, and in an installed state, for example, parallel to the inside of the room and the outside of the room. This means that if this foam body expands, even briefly, it is conceivable that the membrane inside could tear or develop openings that would compromise its overall tightness.

[0008] The present invention is therefore also based on the object of increasing the durability of such sealing tapes and of providing a sealing tape which enables improved sealing and which, in particular, also achieves a correspondingly higher level of sealing in those areas which may be impaired in their recovery by the separating layer or, in general, a separating element.

[0009] DE 10 2016 114 227 describes a method according to the preamble of claim 1 and a sealing tape according to the preamble of claim 7.

[0010] These objects are achieved according to the invention by the subject matter of the independent claims. Advantageous embodiments and further developments are the subject matter of the dependent claims.

[0011] In a method according to the invention for producing a foam sealing tape, a foam carrier is first provided, and this foam carrier is transported in a conveying direction. This foam carrier extends in a longitudinal direction parallel to the conveying direction, in a width direction perpendicular to the longitudinal direction, and in a thickness direction, with this thickness direction being perpendicular to the longitudinal direction and the width direction. The foam carrier preferably has at least one first surface extending in the longitudinal direction and the width direction.

[0012] In a further method step, the foam carrier is cut by a first cut into a first foam carrier part and a second foam carrier part, preferably forming a second surface in each case, wherein these two foam carrier parts are preferably completely separated by the cut (viewed in the width direction). This cut extends at least in a longitudinal direction and in the width direction and / or in the conveying direction and the width direction.

[0013] In a further method step, a separating layer is applied to at least one of the two foam carrier parts on a predetermined surface. Furthermore, the two foam carrier parts are brought together such that the separating layer is arranged between the first foam carrier part and the second foam carrier part. The separating layer extends, at least in sections, in a direction deviating from the longitudinal direction (L) and the width direction (B), forming at least one region of a minimum distance (D1, D2) in the thickness direction (D) from a first surface.

[0014] The separating layer is arranged between the two foam carrier parts in such a way that the thickness of at least one of the two foam carrier parts varies in the width direction.

[0015] Preferably, a strip extending in the longitudinal direction (L) and width direction (B) is separated from the composite of the joined foam carrier parts.

[0016] The separating layer can be a film-like layer, which is attached, for example, to the respective foam carrier part, such as glued. However, it would also be possible for a flowable substance to be applied to the respective foam carrier part, forming the separating layer. Combinations of these two measures would also be possible.

[0017] In a preferred method, this separating layer also causes the foam carrier parts to adhere to one another.

[0018] Preferably, the separating layer is at least substantially airtight. Airtight within the meaning of this invention means that the air permeability is below 20 l / m 2 < x sec, preferably 10 l / m 2 < x sec, more preferably below 5 l / m 2 < x sec, especially preferably below 2 l / m 2 < x sec. These values ​​refer to a measurement method according to DIN EN ISO 9237 with a thickness of 10 mm and a test area of ​​100 cm 2 < and a test negative pressure of 0.5 mbar.

[0019] In a further preferred method, the two foam carrier parts are spaced apart from one another after cutting. In this case, for example, the first foam carrier part can be lifted further away from the first foam carrier part, so that a distance between the two foam carrier parts is further increased. Preferably, the separating layer does not run parallel to the width direction or only runs parallel in sections, but rather is at least partially oblique and / or curved with respect to the width direction. Particularly preferably, the separating layer runs in a wave-like manner in the said width direction. However, the layer preferably also runs parallel to the longitudinal direction (preferably at least in sections).

[0020] In another preferred method, the foam is impregnated. Particularly preferably, the foam is impregnated before said (especially first) cutting step is performed. Particularly preferably, the foam is impregnated for delayed recovery.

[0021] Preferably, in an installed state of the sealing tape, the said separating layer is located in sections closer to one component and in distances closer to the other component, which are connected to one another by the sealing tape.

[0022] In another preferred method, the foam carrier is cut in a straight line, particularly in the width direction. Therefore, a substantially straight cutting tool is particularly preferably used. This simplifies the cutting process. For example, it is possible to use a rotating cutting tool or a reciprocating cutting tool.

[0023] According to the invention, the foam carrier is cut in an at least partially compressed state. The degree of this compression varies in the width direction of the foam carrier.

[0024] In another preferred method, the foam carrier is transported between two conveyor rollers, and the distance between these two conveyor rollers preferably varies at least in the thickness direction. This means that the foam carrier is compressed to varying degrees in the width direction of the foam carrier. For example, one of the two conveyor rollers could have a wave-like or stepped structure and thus be arranged closer to the other conveyor roller in some sections than at other locations.

[0025] It is provided that the foam carrier is compressed at least in sections in its thickness direction, wherein the degree of this compression varies across the width direction and the first cut is carried out in an at least partially compressed state of the foam.

[0026] It would also be possible, for example, for one conveyor roller to have a shaft on which spacing adjustment devices, such as discs, are arranged at predetermined intervals. This creates a corresponding wave-shaped and / or stepped structure, or a structure with different spacing. It would also be possible for the other conveyor roller to have a similar wave structure.

[0027] Furthermore, it would also be possible for the respective shaft structures of the two shafts to mesh, so that, for example, distance adjustment devices of the first roller engage in corresponding recesses of the second roller without the conveyor rollers touching each other. In other words, the conveyor rollers are preferably designed such that they have projections and recesses, with at least one projection of one conveyor roller preferably engaging in a recess of the other conveyor roller.

[0028] In this way, a very pronounced wave structure can be achieved on the foam carrier compressed by these conveyor rollers. Preferably, overcompression of the foam carrier is also achieved, i.e., compression after which the foam (particularly in sections) remains compressed (in a film-like manner). In a preferred method, the foam is therefore compressed to varying degrees in the width direction and also conveyed in different positions (with respect to the thickness direction).

[0029] In this way, even with a straight cutting tool, a wave-shaped cut can be created after the foam has recovered. Therefore, a straight cutting tool is preferably used to allow the foam to recover.

[0030] Therefore, a cut is preferably created during or after compression relative to the thickness direction of the foam carrier, which cut, after recovery of the foam, has at least one minimum and at least one maximum, and preferably a plurality of minima and a plurality of maxima (where these minima and maxima preferably alternate). Preferably, the cut created has a periodically repeating shape in the width direction.

[0031] In the process, the foam is compressed in its thickness direction, the degree of this compression varying across the width direction and the first cut being carried out in an at least partially compressed state of the foam.

[0032] In a further preferred embodiment, the two foam carrier parts are reconnected and, in particular, glued together. Thus, it is possible for the separating layer to be a self-adhesive layer, which is ultimately glued to both foam carrier parts. However, a coating could also be applied, for example, sprayed, to the relevant surface of one of the foam carrier parts, and in particular to the lower foam carrier part, which coating preferably also has adhesive properties.

[0033] Preferably, in a non-compressed state in the composite of the joined foam carrier parts, the separating layer has a wave-shaped profile in the width direction, which has at least one valley region shifted in the thickness direction relative to the center line and at least one peak region shifted in the thickness direction in the opposite direction.

[0034] It is often difficult to keep the distance between the applied separating layer, for example, in the wave crest or trough, and the adjacent first surface sufficiently small to ensure that the sealing tape's airtightness in this space, which is not traversed by the separating layer, is sufficiently high. Therefore, this strip not traversed by the separating layer is preferably removed by at least a second cut.

[0035] In a preferred method variant, it is therefore provided that the severed strip extends, at least in sections, in the thickness direction over a thickness that corresponds at least to the minimum distance of the separating layer from the first surface. A greater thickness is at least to a certain extent harmless, since this would only remove the respective wave crest or trough (at least partially), but the separating layer would still reach up to the surface newly created by the cut and thus guarantee sufficient airtightness across the entire thickness.

[0036] Furthermore, it is preferred that a further strip is severed from the composite of the joined foam support parts, wherein the further strip is preferably severed from the side of the composite of the joined foam support parts opposite the first strip in the thickness direction. This method variant is particularly advantageous because it allows the area not traversed by the separating layer on both sides of the composite of the joined foam support parts to be removed. This ensures that the separating layer reaches up to the surface newly created by the respective cut, both in the area of ​​the wave crests and wave troughs, and can thus guarantee sufficient airtightness across the entire thickness.

[0037] In a further preferred method, a further layer and in particular an additional or adhesive layer is arranged on at least one surface of at least one foam carrier or at least one foam carrier part, in addition to the above-mentioned separating layer between the foam carrier parts.

[0038] This adhesive layer is preferably a self-adhesive layer, by means of which the sealing tape can be glued to at least one building structure during installation.

[0039] The adhesive layer is preferably a double-sided adhesive layer.

[0040] Particularly preferably, this adhesive layer is adhered to the respective surface (in particular a lower surface or an upper surface of the foam carrier part). This adhesion of the adhesive layer can also occur during further transport of the foam carrier or the foam carrier part.

[0041] In a further preferred method, the conveyor rollers convey the foam carrier at least temporarily such that regions of the upward-facing surface are located at least partially beneath regions of the downward-facing surface. In other words, the foam carrier is preferably curved to such an extent that, viewed in the width direction, the thickness distance between the highest regions and the lowest regions is greater than the thickness of the foam in the compressed state.

[0042] Preferably, the foam carrier is guided by conveyor rollers that at least partially interlock (but do not touch). Thus, it is possible for one conveyor roller to have projections as spacing adjustment devices, which engage in recesses in the other conveyor roller.

[0043] In the method, the foam is compressed in its thickness direction, wherein the degree of this compression varies across the width direction, and the above-mentioned first cut is performed when the foam is at least partially compressed. The cutting process is particularly preferably performed during compression or after compression, and in particular immediately after compression. For example, a cutting element could be arranged immediately after the above-mentioned conveyor rollers. The cutting element can, for example, be one or more sawing elements that perform the cuts. It would be possible for such a cutting element to move, for example, in the width direction in order to make the cut easier. An example of a preferred embodiment of such a cutting element is a rotating horizontal band knife.

[0044] In another preferred method, a further layer is applied to at least one surface of at least one foam carrier or at least one foam carrier part. This is an additional layer that is applied in addition to the above-mentioned separating layer between the foam carrier parts and also in addition to the adhesive layer used to attach the sealing tape to a building structure.

[0045] The further layer may, for example, be a coating such as a (nonwoven) fabric that is applied to the surface, but it could also and preferably be a film-like element and even more preferably a foam element that is attached or glued to the surface in question.

[0046] In another preferred method, the additional layer arranged on at least one of the aforementioned surfaces is a cover layer that covers the respective surface at least substantially over its entire area. This cover layer can, in particular, be adhered to the aforementioned surface.

[0047] In a further preferred method, this further layer or cover layer is a further foam layer.

[0048] The additional layer is a cover layer, which has a lower air permeability than the aforementioned foam carrier. This cover layer is preferably airtight.

[0049] In another preferred method, the additional layer or cover layer is applied before cutting the foam carrier. Particularly preferably, the at least one cover layer is also applied at least before compressing the foam carrier in its thickness direction.

[0050] Particularly preferably, this cover layer is applied to a (preferably first) surface which is determined by the width direction and the length direction of the foam carrier, i.e. in particular to the upper or lower surface.

[0051] In another preferred method, a cover layer is also applied to another (preferably first) surface of the foam carrier. This layer can also be a foam layer, and in particular a foam that is airtight or has a higher air resistance than the aforementioned foam carrier.

[0052] In a further preferred method, two cover layers are located opposite each other and / or are separated from each other by a foam carrier part.

[0053] In a further preferred method, the thickness direction of the foam carrier is perpendicular to the two cover layers mentioned.

[0054] In another preferred method, the (preferably first) surfaces on which the two cover layers are arranged are opposite each other. Particularly preferably, the two foam carriers are located between said cover layers.

[0055] In another preferred method, an assembly is produced in which a first cover layer is applied, followed by the first foam carrier part, the aforementioned separating layer, then the second foam carrier part, and finally another cover layer. The layer between the foam carrier parts can also be referred to as a barrier layer.

[0056] Preferably, the cover layers and the two foam carrier parts are at least temporarily adhesively bonded. Preferably, one cover layer is at least temporarily adhesively bonded to each foam carrier part.

[0057] The cover layer can serve to improve the guidance of the foam carrier during its transport. It is particularly preferred that the cover layer supports the section-by-section compression of the foam carrier before the first cut is made. In particular, the cover layer can serve to minimize the minimum distance between the cut and the nearest first surface.

[0058] The cover layer can be removed separately, especially if temporarily bonded to the foam carrier. Alternatively, and particularly preferred, the cover layer is removed together with the separated strip after the second cut has been made. By appropriately selecting the cover layer and foam carrier material, a composite material suitable for further use can be produced.

[0059] In a further preferred method, all layers are compressed, ie in particular both the foam carrier parts (or their precursor which was still present in one piece before the cut was made) and the two arranged cover layers.

[0060] To ensure that the separating layer in the sealing tape extends across the entire thickness, it is usually necessary to separate an upper and lower strip (in the thickness direction) that is not completely traversed by the separating layer (along the thickness direction). If further profitable utilization of the separated strips is not possible, this has the disadvantage of increasing the amount of waste to be disposed of. Therefore, it can be advantageous to produce several sealing tapes as stacks lying one above the other in the thickness direction in a single process and / or to produce the sealing tape from several layers of separated strips, which can be glued together if necessary.

[0061] Therefore, in a preferred method variant, it is provided that, in a non-compressed state, n further third cuts are made in the composite of the joined foam carrier parts, which run parallel to a first surface (i.e. preferably along the longitudinal direction (L) and the width direction (B)), where n is at least 1. In order to produce a stack of two sealing strips arranged one above the other in the thickness direction, a single third cut (n = 1) is sufficient. The third cut or cuts are preferably arranged such that sealing strips of equal thickness are produced. The nearest of these third cuts is therefore preferably at least HD / (n+1) away from a first surface, where HD is the height of the foam carrier in the thickness direction.In case the first surface has been removed by a second cut, it is preferred that the third cut closest to the surface created by the second cut is preferably exactly HD / (n+1) away from this surface.

[0062] It is further preferred that in the case of several third cuts (n > 1), the third cuts are equidistant from each other with respect to the thickness direction.

[0063] In a further preferred method, the interconnected foam carrier parts are cut in a further method step, and preferably at least one further (second or fourth) cut is created in a cutting plane, extending in the thickness direction and in the longitudinal direction. This further (second or fourth) cut is preferably made after the sealing tape has been wound into a compressed sealing tape roll, more preferably into a large roll.

[0064] Preferably, the at least one further (second or fourth) cut and preferably the plurality of further (second or fourth) cuts, which ultimately lead to the rollers, are perpendicular to the first cut which separates the foam carrier into the foam carrier parts.

[0065] In a preferred method variant, m further (second or fourth) cuts are introduced, where m is at least 1 and these further (second or fourth) cuts run in a plane which extends parallel to the length direction (L) and the thickness direction (D).

[0066] In order to ensure that the separating layer extends (at least almost) completely through the sealing tape produced by the further (second or fourth) cut(s) in the thickness direction, a preferred variant provides that these further (second or fourth) cuts are arranged in the region of a minimum distance of the separating layer from a first surface or an intersection point of the separating layer with a surface produced by a third cut.

[0067] To enlarge the area of ​​the intersection point(s) of the separating layer with a surface created by a third cut, it could be advantageous for the wave profile to have a lower gradient and / or, for example, to pass through a plateau when the first cut is made in this area(s). This could be achieved, for example, by appropriately compressing the foam carrier before and / or during the first cut.

[0068] For the purposes of the present invention, an airtight foam is understood to have an air permeability of < 50 l / (m 2 < s), preferably < 30 l / (m 2 < s), and particularly preferably < 10 l / (m 2 < s). The above values ​​refer to measurements of a test specimen 6 mm thick, a test area of ​​100 cm 2 < at a differential pressure of 0.5 mbar using a Frank device type 21443. This preferably allows the production of a joint sealing tape that meets the requirements of DIN 18 542, stress group R.

[0069] Preferably, the impregnated foam sheet is transported by the aforementioned conveyor rollers, compressed, and preferably cut in the middle, particularly with a (band) knife. Stepped rollers are particularly preferably used as conveyor devices, between which, for example, a knife can run in the middle.

[0070] During the next (second or fourth) cut (cutting process), the separating layer between the foam carrier parts is also cut.

[0071] In a further preferred method, an adhesive layer is applied to at least one surface of one of the two foam carrier parts in at least one further method step. In particular, the adhesive layer is applied to exactly one of the foam carrier parts. This adhesive layer preferably lies in a plane to which the width direction and the length direction of the foam carrier are parallel.

[0072] This adhesive layer can preferably be arranged on a surface or an outer surface of either the first or the second foam carrier part, and thus overall on a top or bottom side. The adhesive layer could also be arranged on a surface or an outer surface of either the first or the second cover layer. This adhesive layer preferably serves to adhere the sealing tape to one of the two components between which the sealing tape is to be arranged.

[0073] In a further preferred method, the further (second or fourth) cut is arranged in a region of the foam carrier in which the separating layer extends close to one of the two surfaces of the composite formed from the foam carrier parts. In this way, it is achieved that in the finished product, for example a roll of sealing tape, the said separating layer lies on one side either close to the upper or close to the lower surface. Preferably, the further (second or fourth) cut is thus arranged in a region of the foam carrier in which a wave crest or a wave trough was formed in the surface of one foam carrier part or both foam carrier parts by the first cut.

[0074] Since the separating layer within the foam body is curved overall, for example, wave-shaped and / or stepped, the further (second or fourth) cut is preferably made in such a way that the separating layer migrates, as it were, from one side, for example the lower surface, to the opposite side, for example the upper surface.

[0075] In this way, as explained in detail below, an essentially complete sealing of the foam body can be achieved.

[0076] Particularly preferably, the separating layer is located at least in sections in an upper or lower third of the foam body, particularly preferably in an upper or lower quarter and particularly preferably in an upper or lower fifth of the foam body.

[0077] Particularly preferably, the further (second or fourth) cuts are arranged such that in a region between two adjacent cuts, the separating layer runs from a lower region of the foam body into an upper region of the foam body, wherein the layer preferably does not extend in a straight line in the thickness direction but takes an oblique and / or curved course both with respect to the thickness direction and with respect to the width direction.

[0078] The present invention is further directed to a sealing tape according to claim 7, which is made up as a sealing tape roll and has a first foam carrier part and a second foam carrier part and a separating layer which is arranged between the first foam carrier part and the second foam carrier part, wherein this foam tape extends in a length direction, a width direction perpendicular thereto and a thickness direction perpendicular to the length direction and the width direction, wherein the foam tape preferably has an adhesive layer on one surface and this surface extends in the length direction and the width direction.

[0079] Preferably, this separating layer arranged between the foam carrier parts is substantially or completely airtight and can therefore also be referred to as a barrier layer.

[0080] The separating layer extends in the length direction, the width direction, and the thickness direction. This means that the separating layer not only runs in a plane parallel to one of the aforementioned directions, but rather in all directions. Preferably, the separating layer is curved, in particular, wave-shaped or sinusoidally curved.

[0081] Preferably, the layer extends in the width direction from a lower n-th of the foam strip to an upper n-th of the foam strip, where n is greater than 3, preferably greater than 4, preferably greater than 5 and particularly preferably greater than 6.

[0082] The separating layer preferably extends in the longitudinal direction of the sealing tape and in particular also runs parallel to this longitudinal direction.

[0083] Preferably, the separating layer has a lower gas permeability than the foam carrier parts.

[0084] In a further preferred embodiment, the separating layer is a film layer and / or a separating layer which results from a substance applied and in particular sprayed onto at least one foam carrier part.

[0085] Preferably, said separating layer also has adhesive properties.

[0086] Particularly preferably, this separating layer is at least partially, and preferably substantially completely, adhered to both the first foam carrier part and the second foam carrier part. This separating layer can preferably adhere to at least one foam carrier part and preferably to both foam carrier parts.

[0087] In a further advantageous embodiment, the foam carrier parts are made of the same material.

[0088] Particularly preferably, the separating layer extends within the foam body such that it encloses a predetermined angle with the thickness direction, with this angle preferably varying. Particularly preferably, this angle varies across the width direction by at least 10°, preferably by at least 20°, preferably by at least 30°.

[0089] It is therefore possible that, for example, at the edge sides of the sealing tape, the angle formed by the separating layer with the thickness direction is very high, for example greater than 70°, preferably greater than 80°.

[0090] Particularly preferably, this angle is significantly smaller in a central region, ie, the separating layer extends in a direction that forms an angle with the thickness direction that is less than 60°, preferably less than 50°, preferably less than 40°, and particularly preferably less than 30°. This situation is explained in more detail with reference to the figures.

[0091] In a particularly preferred embodiment, the region of the greatest gradient of the separating layer's profile is arranged off-center relative to the width direction. In particular, it is preferred that the region of the greatest gradient of the separating layer's profile be offset from the center of the sealing strip in the width direction, toward the side surface of the sealing strip facing the interior of the room when installed. This ensures that the sealing strip has a greater seal on the half arranged on the interior side of the room than on the half arranged on the exterior side.

[0092] Particularly preferably, the separating layer extends in the interior of the foam body in such a way that it substantially (almost completely) prevents air from passing through from one side surface of the sealing tape towards the other side surface of the sealing tape.

[0093] In a further preferred embodiment, the foam of the foam carrier part is a polyurethane foam, and in particular an impregnated polyurethane foam. This polyurethane foam is preferably impregnated for the purpose of delayed recovery.

[0094] Particularly preferably, a layer thickness of the two foam carrier parts together is greater than 2 mm, preferably greater than 4 mm, preferably greater than 6 mm.

[0095] Particularly preferably, the layer thickness of the two foam carrier parts together is less than 500 mm, preferably less than 400 mm, preferably less than 200 mm, preferably less than 150 mm and particularly preferably less than 120 mm and preferably less than 100 mm.

[0096] In a further preferred embodiment, the separating layer is a film, in particular a plastic film. This film can particularly preferably be bonded to at least one foam carrier part via an adhesive, and particularly preferably, it can be adhesively bonded to a foam carrier part, so that the separating layer also holds the two foam carrier parts together.

[0097] Advantageously, this separating layer has a thickness greater than 5 µm, preferably greater than 7 µm, preferably greater than 10 µm, and particularly preferably greater than 15 µm. Particularly preferably, this separating layer has a thickness less than 800 µm, preferably less than 700 µm, preferably less than 600 µm, preferably less than 500 µm, preferably less than 300 µm, preferably less than 200 µm, and particularly preferably less than 100 µm.

[0098] The separating layer is preferably flexible and / or stretchable.

[0099] The foam particularly preferably has a density which, in a non-impregnated state, is greater than 20 kg / m 3< , preferably greater than 25 kg / m 3< . The foam particularly preferably has a density in a non-impregnated state which is less than 80 kg / m 3< , preferably less than 70 kg / m 3< , preferably less than 60 kg / m 3< , preferably less than 50 kg / m 3< and particularly preferably less than 40 kg / m 3< . The impregnate preferably brings about an increase in density of more than 10 kg / m 3< , preferably more than 20 kg / m 3< and preferably more than 30 kg / m 3< . In particular, the impregnate causes an increase in density which is less than 300 kg / m 3< , preferably less than 200 kg / m 3< and particularly preferably less than 100 kg / m 3< .

[0100] The aforementioned separating layer, which is arranged between the foam carriers, can be, for example, a stretch film, such as a PE stretch film or a thin PVC film and / or a moisture-variable polyolefin film. In addition, (adhesive) materials made of rubber, acrylic resin, film-forming plastics in general, and the like can also be used instead of a film.

[0101] Particularly preferably, the sealing tape is designed such that, in an assembled state, the separating layer between the foam carrier parts essentially prevents air from passing through (in particular in the width direction of the sealing tape).

[0102] The separating layer completely separates the two foam carrier parts from each other.

[0103] A self-adhesive layer is applied to an outer surface of the composite of the two foam carrier parts. This adhesive layer preferably extends in the longitudinal and width directions of the sealing tape. This adhesive layer serves to attach the sealing tape to a building structure.

[0104] In addition to the release layer and the adhesive layer, a cover layer is arranged on at least one foam carrier part. This cover layer can also be made of a foam. Particularly preferably, this is a foam that has lower air permeability than the aforementioned foam and can, in particular, be designed to be airtight.

[0105] This cover layer, through which the adhesive layer advantageously does not extend, effectively prevents the passage of air. The release layer preferably extends into the cover layer, up to the cover layer, or at least into the immediate vicinity of the cover layer. If there are no points of contact between the cover layer and the release layer, the distance between these layers should be a maximum of 3 mm, preferably < 2 mm, and particularly preferably < 1 mm.

[0106] The cover layer is preferably a foam. It is advantageous that, during production, at least one additional foam sheet is attached as a cover layer to the foam carrier, in particular to one of its top and bottom sides. As mentioned, this can be an airtight foam. It is particularly preferred that the foam of the at least one cover layer and the foam of the foam carrier parts are different.

[0107] In a further advantageous embodiment, a cover layer is also arranged on the respective other foam carrier part. This first layer and the second layer are preferably arranged such that the two foam carrier parts are arranged between these two cover layers, in particular in the thickness direction of the sealing strip. This second cover layer is also designed in the same way as the above-mentioned first cover layer. This cover layer is therefore preferably also a foam layer and / or a substantially airtight cover layer.

[0108] The first covering layer preferably comprises a foam that is as closed-cell and preferably as airtight as possible. In addition to providing airtightness, this foam also has the task of adapting as well as possible to the mineral substrates commonly found in a building structure. It is possible for this first covering layer or foam to be impregnated, but this is not absolutely necessary.

[0109] The second cover layer preferably comprises a foam that is as closed-cell and / or as air-impermeable as possible. However, it is also possible for the two cover layers to have the same structure or be identical. This second cover layer or the foam in question does not need to be impregnated.

[0110] The above-mentioned adhesive layer, preferably self-adhesive, is preferably applied to the outer side of this cover layer as an assembly aid. This product side faces the component, for example, a window frame or the like, during application.

[0111] Advantageously, the cover layer is also made of a foam. This foam can be selected from a group of foams including PVC foam, PE foam, EPDM foam, neoprene foam, and the like.

[0112] Preferably, the at least one cover layer has a layer thickness that is greater than 0.5 mm, preferably greater than 1 mm, preferably greater than 2 mm.

[0113] Preferably, the at least one cover layer has a layer thickness that is less than 30 mm, preferably less than 20 mm, preferably less than 15 mm, preferably less than 10 mm and particularly preferably less than 6 mm.

[0114] As mentioned, at least one of the cover layers and preferably both cover layers are made of an airtight material and in particular an airtight foam.

[0115] In a preferred embodiment, it is provided that a cover layer or generally an element made of a substantially air-impermeable foam is arranged at least on the first surface.

[0116] However, it would also be conceivable for the cover layers to be unattached or only temporarily attached to the foam carrier. They thus form auxiliary layers that are preferably added to the foam carrier before profiling to assist its profiling. In particular, they space the foam carrier from the rollers, thus enabling cutting with the cutting device described above at a certain distance from the rollers. After profiling, the auxiliary layers can be removed and reused.

[0117] In a further preferred embodiment, the foam carrier is provided with a greater thickness than the sealing tape to be produced. After partial compression by the rollers described above and cutting into two foam carrier parts by the cutting device, profiled foam carrier parts with a greater thickness than necessary are obtained. This has the advantage that a comparatively thick foam part remains even in the area of ​​the wave troughs present in the foam carrier part and introduced during the cutting process described above. This can ensure sufficient stability of the foam carrier part and, for example, reduce the risk of tearing during transport.Only in a subsequent process step, preferably after the two foam carrier parts have been joined with the separating layer, is the foam part located at least on one side between the at least one wave trough and the foam carrier part surface cut off, so that the respective wave trough now (at least almost) contacts the surface newly created by the cutting process. The separated foam parts can be recycled.

[0118] In an alternative or additional embodiment, the sealing strip for sealing building structures extends in a longitudinal direction and in a width direction perpendicular to the longitudinal direction. Furthermore, the sealing strip has a first surface that extends at least substantially in the longitudinal direction and in the width direction, and a second surface that also extends in the longitudinal direction and the width direction and is spaced from the first surface and, in particular, is also parallel to the first surface.In this sealing tape, the first surface and the second surface each serve to engage the structural elements (and in particular, different structural elements), wherein the sealing tape comprises at least one foam body and a separating element which extends at least partially from the first surface to the second surface and which is suitable and intended to at least impede the passage of a flowable medium through the sealing tape. In this variant, it is provided that a layer or generally an element made of a substantially air-impermeable foam is arranged at least on the first surface.

[0119] Such a layer (also referred to above as a cover layer) or, more generally, such an element made of a substantially air-impermeable foam could - as already described above - in a preferred embodiment also be provided on a (first) surface of a sealing tape as described above (preferably intended for application to a building structure). It is therefore pointed out that all of the following features can also be combined with the features described above with regard to the first alternative.

[0120] In a preferred embodiment, the separating element is suitable and intended to substantially prevent and preferably prevent a passage of a flowable medium through the sealing tape.

[0121] In a further preferred embodiment, the layer covers the surface on which it is arranged to more than 30%, preferably to more than 50%, preferably to more than 70%, preferably to more than 80%, preferably to more than 90% and particularly preferably substantially completely.

[0122] However, it would also be conceivable that only a comparatively thin band would be applied to the surface as a layer, which would accordingly only cover a small area of ​​10% or even less.

[0123] The separating element is a separating layer that extends at least partially from the first surface to the second surface. This separating layer may be arranged on an outer surface of the foam body, but the separating layer is at least partially arranged and / or extends at least partially within the interior of the foam body.

[0124] The foam body has a first foam body section and a second foam body section, which are completely separated from each other by the separating layer.

[0125] In a further advantageous embodiment, the first foam body section is a first foam body and the second foam body section is a second foam body and the separating layer completely separates these foam bodies.

[0126] This layer (which is arranged on the first surface) is advantageously a flexible layer. Particularly preferably, this layer is arranged flatly on the respective surface, and in particular on the surfaces of both foam bodies. This further airtight layer is particularly preferably pressed against the structural elements in an installed state. It is possible and preferred for the separating layer to adjoin this layer or foam layer, thus increasing the contact area with the respective structural element, particularly with the aid of the foam layer.

[0127] In a preferred embodiment, the sealing tape has a sandwich-like structure and can, for example, have a firmer and airtight foam base that is arranged between a mounting self-adhesive and the respective multifunctional tape.

[0128] In a further advantageous embodiment, the foam in a fully recovered state has a density which is at least 30 kg / m 3< , preferably at least 40 kg / m 3< , and particularly preferably at least 50 kg / m 3<.

[0129] In a further advantageous embodiment, the foam in a fully recovered state has a density of at most 250 kg / m 3< , preferably at most 200 kg / m 3< , and particularly preferably at most 150 kg / m 3<.

[0130] In a further advantageous embodiment, the material of the first foam body and / or the material of the second foam body or generally, if only one foam body is present, is open-pored.

[0131] In a further advantageous embodiment, the further layer or the air-impermeable layer has a density which is at least 5 kg / m 3< , preferably at least 7 kg / m 3< , and particularly preferably at least 10 kg / m 3<.

[0132] In a further advantageous embodiment, the further layer or the air-impermeable layer has a density which is at most 100 kg / m 3< , preferably at most 70 kg / m 3< , and particularly preferably at most 50 kg / m 3<.

[0133] In a further advantageous embodiment, the material of the foam body is a PU foam.

[0134] The separating layer is particularly preferably a separating film. However, it can also be formed from an adhesive layer or an adhesive.

[0135] In a further advantageous embodiment, the separating layer has a thickness which is greater than 2 µm, preferably greater than 4 µm, preferably greater than 6 µm, preferably greater than 8 µm and particularly preferably greater than 10 µm.

[0136] In a further advantageous embodiment, the separating layer has a thickness of less than 400 µm, preferably less than 300 µm, preferably less than 200 µm. Particularly preferably, the separating layer is attached to at least one foam body by means of an adhesive. This adhesive is particularly preferably an acrylate-based adhesive. However, a rubber-based adhesive could also be used. Other self-adhesive materials could also be used.

[0137] In a further advantageous embodiment, the separating layer is a liquid-tight separating layer. This prevents the passage of liquid and / or vapor through said layer (or, in the case of vapor, slows it down).

[0138] In a further advantageous embodiment, the separating layer is attached to the first foam body and / or the second foam body. Particularly preferably, the separating layer is attached to both foam bodies and / or foam body sections. In a further advantageous embodiment, the separating layer is adhesively bonded to at least one of the two foam bodies and / or foam body sections. Particularly preferably, the separating layer is adhesively bonded to said foam body and / or foam body section.

[0139] According to the invention, an adhesive layer is arranged at least on the further (preferably the second or fourth) surface, i.e., in particular, on the surface opposite the first surface. This is a self-adhesive mounting layer. In this way, the sealing tape can be attached to a building structure. Particularly preferably, the separating layer adjoins said further layer, and in this way, the contact area with the building structure can be increased with the help of this foam layer.

[0140] In a further advantageous embodiment, the first foam body and / or the second foam body (or the foam body and / or the first and second foam body sections) are made of an impregnated and / or resilient foam. Preferably, the further layer is not impregnated or resilient.

[0141] The foam body is made up as a sealing tape roll and it is possible that after unrolling the foam will reset, especially in the area to be sealed.

[0142] In a further advantageous embodiment, the layer is made of a closed-cell foam. This also ensures airtightness.

[0143] In general, the contact area is greatly increased by the airtight foam layer on the building side (compared to the edge of a membrane).

[0144] A soft, airtight foam that adapts to uneven surfaces adheres better to the building surface. It is preferably connected airtight to the inner membrane. On the profile side, the foam layer offers advantages. For example, it can bridge webs and prevent uncontrolled swelling between grooves and webs. Furthermore, the additional layer prevents air from migrating around the membrane on the profile side between the webs.

[0145] In a further preferred embodiment, the layer has a smaller thickness than the foam body. In particular, in a restored state of the foam body, the layer has a smaller thickness than this foam body. Particularly preferably, the thickness of this layer is at most 50% of the thickness of the foam body, preferably at most 40%, preferably at most 30%, preferably at most 20%, and particularly preferably at most 10%.

[0146] The separating layer extends in the length, width, and thickness directions of the sealing tape. It would be conceivable for the separating layer to run diagonally between the foam elements, thus extending in the width direction of the sealing tape.

[0147] The sealing tape comprises at least two, and preferably more than two, foam bodies, each separated from one another by separating layers. For example, there may be three foam bodies separated by two such separating layers. These separating layers may run essentially parallel to one another.

[0148] In a further advantageous embodiment, when the foam body is in a fully recovered state, the separating layer extends in the thickness direction over a smaller area than the foam body. This is particularly preferably a slightly smaller area. For example, in the areas where the separating layer ends, depressions can be formed in the region of the foam body in the recovered state. The above-mentioned layer preferably rests in the region of this depression, thus ensuring greater impermeability.

[0149] For example, the invention further relates to a construction arrangement comprising a first structural body and a second structural body, wherein a sealing strip of the type described above is arranged at least in sections between these structural bodies.

[0150] Advantageously, the assembly comprises a window or window frame and the adjacent part of the building. However, the invention can also be applied to doors, door frames, and facade profiles. In this way, the sealing tape described here seals, in particular, the gaps between a window or window frame and the corresponding building part, for example, a brickwork (or a door or door frame and a facade profile).

[0151] The present invention further relates to a method for producing a sealing tape according to claim 1.

[0152] The first foam body is bonded to a second foam body, with a separating layer being placed between the first and second foam bodies. This is done using the method already described above.

[0153] In a further method step, a further layer is arranged on a surface of the first foam body and the second foam body. In particular, this is a surface that serves to contact one of the structural elements. In particular, this further layer is a foam layer. This further layer preferably runs parallel to the first foam body and / or the second foam body.

[0154] This layer is preferably a flexible layer. This further layer is particularly preferably a substantially airtight layer.

[0155] In another preferred method, the foam bodies are attached to one another. It is possible for the separating layer to be glued to the first foam body, and then for the second foam body to be glued to this layer as well. For example, it is possible for the separating layer to be double-sided adhesive.

[0156] In another preferred method, the foam bodies are impregnated. Particularly preferably, the foam bodies are impregnated before they are brought together with the said separating layer.

[0157] In a further advantageous embodiment, an adhesive layer is arranged on the opposite surface of the first layer of foam bodies. In this way, the foam bodies can be sandwiched between the adhesive layer and the aforementioned layer.

[0158] However, it would also be possible to arrange a further foam layer on the foam bodies in addition to the aforementioned layer. This makes it possible for the foam bodies to be sandwiched between two further layers, especially foam layers.

[0159] Further advantages and embodiments can be seen from the attached drawings:

[0160] Showing: Fig. 1 shows an arrangement according to the internal state of the art for producing a sealing tape; Fig. 2 shows a diagram illustrating the functioning of the Fig. 1shown arrangement; Fig. 3 a representation of a sealing tape to be produced according to the applicant's internal prior art; Fig. 4 a representation of a sealing tape produced according to the applicant's internal prior art; Fig. 5 a further representation to illustrate a manufacturing process; Fig. 6 a sectional representation of a process product according to a process according to the applicant's internal prior art; Fig. 7 a representation to illustrate the problems with the applicant's internal prior art; Fig. 8: a representation for the production of a sealing tape according to an embodiment of the invention; Fig. 9 a representation of a sealing tape; Fig. 10 a representation to illustrate characteristics of a sealing tape; Fig. 11 a representation of a method for producing a sealing tape; Fig. 12 a representation of a product used in the method according to Fig. 11manufactured sealing tape; Fig. 13 a sectional view of an intermediate product of a preferred process variant; Fig. 14 a schematic view of a preferred process variant; Fig. 15 a schematic view of a further preferred process variant; Fig. 16 a sealing tape arrangement according to the prior art; Fig. 17 a sealing tape arrangement in an assembled state; and Fig. 18 a further view of a preferred sealing tape arrangement.

[0161] Figure 1 shows a schematic representation of a procedure for producing a sealing strip. A first conveyor roller or conveyor roll 12 is provided, as well as a second conveyor roller or conveyor roll 14. A foam carrier 2 is conveyed between these two rollers. It can be seen that the conveyor roll 12 has spacing adjustment devices, for example, additional discs 12a, and recesses 12b are formed between these discs 12a.

[0162] Accordingly, the conveyor roller 14 also has projections or discs 14a, as well as recesses 14b arranged therebetween. The two conveyor rollers 12 and 14 are offset relative to one another (along their longitudinal direction or the width direction of the foam carrier) such that the projections 12a of the conveyor roller 12 engage in the recesses 14b or are at least opposite them.

[0163] In this way, the foam carrier 2, as shown in Fig. 1 shown, conveyed in a wave-like manner. Reference number 5 denotes a cutting blade, which cuts the foam during or after conveyance through the rollers or rolls. This cuts the impregnated foam sheet or foam carrier 2 (in Fig. 1 ) come out of the figure plane and is transported by the rollers 12, 14, compressed and here preferably cut in its middle with the cutting element 5.

[0164] Figure 2 shows a further illustration of a foam carrier 2 conveyed in the direction of arrow F. This has a longitudinal direction L as well as a thickness direction D. The width direction B is in the Fig. 2 not shown and extends perpendicular to the plane of the figure. This creates a cut in the deformed foam carrier, which extends, on the one hand, in the width direction B and, on the other hand, due to the conveyance of the foam 2, in the conveying direction F and thus also in the longitudinal direction L.

[0165] As can be seen from Fig.1 and Fig.2 Step rollers are used here to ensure the wave-like compression of the foam. This also allows Fig. 2Stepped rollers 12, 14 are shown at the top and bottom, and a cutting blade runs through the center. As mentioned above, the foam carrier is a known and preferably impregnated foam carrier. The foam carrier is advantageously already impregnated before the cutting and conveying process.

[0166] Fig. 3shows a further process step for producing a sealing tape. After compression (by the rollers or rolls 12, 14), cutting, and preferably subsequent decompression of the cut foam, wave-shaped foam carrier parts 22 and 24 are obtained. The foam carrier part 22, and preferably also the foam carrier part 24, has "peak regions" 22b and 24b, respectively, and "valley regions" 22a and 24a, respectively. A separating layer, such as a barrier layer in this case, is inserted into the space created by the cut between the foam carrier parts 22 and 24.

[0167] Corresponding to the "peak areas" 22b and "valley areas" 22a, the foam carrier part 24 also has "valley areas" 24a and "peak areas" 24b. However, the respective "valley areas" are also too thick with regard to their distance from the lower surface 36 or upper surface 38 of the respective foam carrier parts, and accordingly, the problem can arise that the inserted film only inadequately seals the subsequent product or ensures sufficient airtightness (the air can flow above and / or below the film or generally the sealing element, as described below with reference to Figure 7 is described in more detail.

[0168] Fig. 4shows a representation of a corresponding sealing tape 100 with inserted film 4. The foam carrier parts 22 and 24 are positioned toward one another so that they rest against the separating layer 4. Preferably, they are each glued to the separating layer 4. Here, too, it can be seen that above the respective maxima and minima of the sealing tape path, there are large distances to the respective lower and upper sides 36 and 38 of the sealing tape.

[0169] In a further step, which is Fig. 5 As shown, the tape produced in this way is again compressed and preferably provided with a self-adhesive layer 8. This creates a so-called dock. The arrows in Fig. 5 indicate the compression of the foam carrier in the thickness direction D.

[0170] Fig. 6 shows a representation of the sealing tape product manufactured according to the applicant's internal state of the art.

[0171] Here you can see the two foam carrier parts 22 and 24 as well as the sealing element or the separating layer 4, which runs between these foam carrier parts 22 and 24.

[0172] Reference numerals 32 and 34 refer to side surfaces of the sealing tape that, when installed, face the outside and inside of the room, respectively. It can be seen that across the width B of the sealing tape, the layer does not run horizontally, but rather extends upwards in the thickness direction.

[0173] Fig. 7shows the problems of a corresponding sealing tape in the prior art. It can be seen that although air does not pass through the sealing tape in a central area of ​​the sealing tape (as indicated by arrow P3), secondary air paths still exist, as indicated by arrows P1 and P2. In particular, in the valley area of ​​the sealing strip, there is an area of ​​impregnated foam that still allows too much air to pass through. Reference numeral 8 denotes a self-adhesive layer with which the sealing tape can be attached to a building structure.

[0174] Fig. 8shows a procedure for advantageously manufacturing a sealing tape. Here, too, the foam carrier 2 is guided between two conveyor rollers 12 and 14, with shafts 13 and 15 also shown. Compared to the internal state of the art, the two rollers are positioned closer together, and it can be seen that the projections overlap. This is not absolutely necessary, but it is advantageous.

[0175] By bringing the two waves, or rather the conveyor rollers 12 and 14, closer together, the beam is curved even more sharply, thus significantly increasing the wave characteristics. This allows the transition from a wave crest to a wave trough to be made even steeper.

[0176] The result of this is in Fig. 9in the form of a sealing tape 1. Here, too, the foam carrier parts 22 and 24 are shown, but with the reference symbols D1 and D2 the significantly minimized thickness sections through which air can still pass from the inside side surface 32 to the outside side surface 34 or from the outside side surface 34 to the inside side surface 32. Here, too, an adhesive strip 8 is shown on the underside of the sealing tape.

[0177] Fig. 10shows a schematic illustration of the course of the sealing strip or the sealing element between the foam carrier parts 22 and 24. It is shown that a gradient of the course of the separating layer 4 or the barrier layer 4 changes continuously. In a central region II with respect to the width direction B of the foam carrier, the film runs with a very steep gradient, which can be seen from the relatively small angle α1 that this gradient or an imaginary geometric tangent T1 forms with the thickness direction D of the strip. In regions I and III, i.e. in the vicinity of the side surface 32 on the inside of the room and the side surface 38 on the outside of the room, this gradient is relatively small, which is made clear by the high angle α2 (only shown for the left-hand region I). As already mentioned above as an advantageous embodiment, the region of the greatest gradient of the course of the separating layer is arranged off-center with respect to the width direction.The central area II is therefore preferably located inside the sealing tape, but does not have to be located centrally.

[0178] In the prior art, layer 4 also extends over a larger area in the thickness direction of the strip. Reference symbol D4 denotes the thickness section of the sealing strip within which layer 4 extends. Preferably, a ratio between this thickness section D4 and the total thickness D (of the substantially recovered sealing strip) is greater than 0.6, preferably greater than 0.7, preferably greater than 0.8, and particularly preferably greater than 0.9.

[0179] This shows that the gradient of the separating layer 4 or the barrier layer 4 preferably changes significantly within the foam body. Therefore, the separating layer 4 is preferably arranged neither horizontally nor vertically and particularly preferably also has a curved profile, but in any case a profile with a changing gradient.

[0180] In addition to the possibilities shown in the figures, i.e. overcompression such that the foam remains compressed like a film, a thermal treatment could also be carried out with the same aim. For example, it would be conceivable for the surfaces 36 and / or 38 of the foam carrier part(s) to be treated thermally or chemically in such a way that a skinning of the surfaces 36 and / or 38 occurs. A thermal exposure which leads to the destruction of the foam structure would be conceivable here. For PU foams, for example, exposure to a temperature in the range of approximately 250 - 350 °C, particularly preferably in the range of 280 - 290 °C, has proven suitable. Simultaneous pressure application has proven advantageous. In addition or alternatively, a chemical surface treatment could be carried out which destroys the molecular bonds between or within the polymer chains.An acid or base treatment followed by neutralization would be conceivable.

[0181] As mentioned above, the separating layer 4 can be a film-like layer, but it would also be possible for this separating layer to be sprayed on. For example, a film-forming plastic dispersion could be used for this purpose. Thus, it is possible for the foam carrier to first be cut into the two foam carrier parts 22 and 24, and then a substance to be sprayed into the intermediate area, which subsequently forms the separating layer 4.

[0182] According to the invention, to produce the foam body, the foam carrier 2 is cut, then one of the carrier parts is spaced or removed from the others, and the separating layer 4 is introduced. Subsequently, the two foam carrier parts 22, 24 are brought back together.

[0183] Fig. 11shows a further advantageous procedure for producing a sealing strip. Here, two additional elements or cover layers or plies 16 and 18 are arranged on the top and bottom of the foam carrier 2. These two cover layers, for example, also consist of a foam or a foam sheet. However, these foams 16 and 18 are airtight foams. These can, but do not have to, be impregnated. They are preferably bonded to the respective foam carrier part, e.g., by means of a self-adhesive bond.

[0184] However, it would also be conceivable for the cover layers 16 and 18 to be provided as auxiliary layers unconnected to the foam carrier 2. Preferably, they extend toward the foam carrier 2 prior to profiling and support the profiling. In particular, they space the foam carrier 2 from the rollers 12 and 14, thus enabling cutting with the cutting device described above at a certain distance from the rollers. After profiling, the auxiliary layers 16 and 18 can be removed and reused. They serve to achieve a steeper profiling and a desired narrower shape of the areas P1 and P2.The minimum distance between the separating layer 4 and the upper and lower surfaces of the respective foam carrier part can be minimized to such an extent that the transfer of air from the inside side surface 32 to the outside side surface 34 or from the outside side surface 34 to the inside side surface 32 is minimized.

[0185] Fig. 12shows a corresponding representation of a sealing tape 1, in which several layers or elements are present. First, an upper foam sheet 16, i.e. the airtight foam or the upper cover layer, is provided. This is followed by a first foam carrier part 22, then the separating layer 4 and the second foam carrier part 24. Below the second foam carrier part 24, there is another foam sheet or cover layer 18 (made of airtight foam 18) and finally the adhesive layer 8 already mentioned above. As already mentioned above as a preferred embodiment, in Fig. 12 It is shown that the separating layer 4 not only approaches or clings to the respective cover layers, but also penetrates into them in sections.

[0186] Reference numerals 32 and 34 again indicate the interior and exterior side surfaces of the sealing tape, respectively. As mentioned above, the sealing tape is manufactured as a roll, i.e., it would be wound onto a roll, with a roll axis extending parallel to the width direction B.

[0187] It can be seen that in this embodiment, air penetration is prevented by the separating layer 4 in the central region. Air cannot penetrate the upper and lower regions either, since the cover layers 16 and 18 are airtight foam elements.

[0188] This means that the valleys, which are not airtight in themselves, can be closed by the cover layers 16 and 18.

[0189] The two procedures can also be combined; on the one hand, relatively steep flanks of the separating layer 4 and, on the other hand, the additional covering layers 16 and 18 can be applied.

[0190] This preferably allows the following process steps to be carried out. First (optionally) a foam sheet and in particular a PU flexible foam sheet can be impregnated. In a further (optional) process step, this flexible foam sheet can be dried. In a further process step, one and preferably two very airtight and preferably also thin foam sheets can be attached to the top and bottom sides of the foam sheet. This can be done, for example, using double-sided adhesive tape (SK). In a further process step, the foam sheet and the two foam sheets arranged on it are profiled with rollers, in particular with very closely adjusted rollers. This results in a steeper wave flank, as mentioned above. The partially compressed foam sheet is then cut into two foam carrier parts.

[0191] In a further (optional) process step, the web is unfolded or one of the two foam carrier parts is spaced from the other in order to insert a separating layer, for example a film or a coating.

[0192] In a further process step, the foam carrier parts 22, 24 are joined together.

[0193] In a further (optional) process step, cutting to length is preferably performed. This cutting step can also be performed after profiling. Finally, the foam carriers are compressed (optionally), preferably with a self-adhesive layer 8, into a roll, in particular a large roll. This large roll is then cut to length in a final process step, thus creating the individual rolls.

[0194] Figure 13shows a sectional view of an intermediate product of a preferred process variant. The foam carrier 2 has already been cut by a first cut into a first foam carrier part 22 and a second foam carrier part 24. A separating layer 4 has been introduced into the gap created by this cut. This separating layer 4 contacts the second surfaces created by the cut over their entire surface. The first cut, and thus also the separating layer 4, follows a wave-like course. Valley regions 22a and peak regions 22b follow one another in the width direction and are offset from one another with respect to the thickness direction D. In the peak regions 22b, the separating layer 4 approaches the upper first surface 38, and in the valley regions, it approaches the lower first surface 36.

[0195] Despite this approximation, however, thickness sections D1 and D2 remain that are not completely traversed (along the thickness direction) by the separating layer 4. To prevent air penetration through these areas in the final product (the sealing tape), it is preferably provided to separate these strips forming the thickness sections D1 and D2.

[0196] Figure 14shows a schematic representation of a preferred method variant for separating these strips forming the thickness sections D1 and D2. In the example shown, two second cuts 40 are provided along the hatched planes. As a result, the strips forming the thickness sections D1 and D2 are separated and an intermediate product 42 is produced which has a reduced thickness compared to the total height HD of the foam carrier 2. This intermediate product comprises two interconnected foam carrier parts 22 and 24, between which a separating layer 4 is arranged. The separating layer 4 runs in each region between a maximum and a minimum over the entire thickness D of the intermediate product, so that there are no regions in which a gas could flow through the intermediate product 42 in the width direction B without being stopped by the (airtight) separating layer 4.

[0197] Figure 15shows a schematic representation of a further preferred process variant, in which the proportion of foam that cannot be used to produce the desired sealing tape is reduced. This can be achieved by using a foam carrier 2 of greater thickness (in the thickness direction D) and by introducing at least one third cut 44. If, as in the example shown, a single third cut 44 is provided, the amount of unusable foam can be kept the same with twice the amount of intermediate product 42 that can be used to produce sealing tapes. To ensure that every section of the intermediate product 42 is traversed by the separating layer over its entire thickness, here too only two strips (namely the upper and lower thickness sections D1 and D2) are separated, so that compared to the Figure 14In the variant shown, the amount of unusable foam is not increased. However, the usable portion of the intermediate product 42 is doubled, since the third cut 44 creates two Figure 14 equivalent intermediate products 42 are produced.

[0198] Fig. 16 shows a sealing tape according to the prior art. This sealing tape has a first foam body 102 and a second foam body 104. A separating layer 106 runs between these two foam bodies.

[0199] It can be seen that in the end sections of this separating layer between the two foam bodies, depressions can form, which promote the passage of air and thus impair the insulating effect.

[0200] Fig. 17 shows that in Fig. 16shown sealing tape in an assembled state between two structures 130 and 140. As indicated by the arrows P, air can pass here between the structures 130 and 140 and past the sealing tape.

[0201] Fig. 18 shows a representation of a preferred sealing tape. Here, too, two foam bodies 102 and 104 are provided, between which the separating layer 106 runs. This separating layer runs essentially perpendicularly between a first surface 112 and a second surface 114. These two surfaces are each intended to be applied to the building structures.

[0202] The reference numeral 108 denotes the further layer of an air-impermeable material, which is arranged here on the surface 112 and preferably covers it substantially completely.

[0203] An adhesive layer 118 is arranged on the second surface 114, which serves to adhere the sealing tape 100 to a building structure. A further layer (not shown) of an air-impermeable material could also be arranged on this surface. In particular, this additional layer 108 can cover the depressions that form at the boundary areas between the two foam bodies 102 and 104.

[0204] It is further noted that features are also described in the individual figures which may be advantageous in themselves. The skilled person will immediately recognize that a particular feature described in a figure may also be advantageous without the adoption of further features from that figure. Furthermore, the skilled person will recognize that advantages also arise from a combination of several features shown in individual or different figures.

[0205] It is understood that the invention is defined solely by the appended claims. List of reference symbols

[0206] 1Sealing tape 2Foam carrier 4Separating layer, barrier layer (film, sprayed / applied layer) 5Cutting element 8Adhesive strips 12, 14Rollers or rollers 12a, 14aProtrusions 12b, 14bRecesses 13, 15Corrugations of the rollers or rollers 16Upper airtight material layer, cover layer 18Lower airtight material layer, cover layer 22First foam carrier part 22a, 24aValley areas 22b, 24bMountain areas 24Second foam carrier part 32Inside side surface 34Outside side surface 36Lower (first) surface of the foam carrier part 38Upper (first) surface of the foam carrier part 40Second cut 42Intermediate product, connected foam carrier parts with separating layer 44Cut 100Sealing tape (internal state of the Technology) 102first foam body 104second foam body 106separating layer 108further layer 112first surface 114second surface 118adhesive layer 130building body 140building body LLongitudinal direction BBidth direction DDickness direction D1, D2Thickness sections D4Thickness section over which the layer extends FConveying direction SSections for cutting off the rolls P1, P2, P3Flows T1, T2Tangents α1, α2Angles I, II, IIAreas

Claims

1. Method for producing a sealing tape (1) and in particular a foam sealing tape (1), comprising the steps of: - providing a foam carrier (2) and transporting this foam carrier (2) in a conveying direction (F), wherein this foam carrier (2) extending in a longitudinal direction (L) parallel to the conveying direction, in a width direction (B) perpendicular to the longitudinal direction (L) and in a thickness direction (D), wherein this thickness direction (D) being perpendicular to the longitudinal direction (L) and the width direction (B), - cutting this foam carrier (2) into a first foam carrier part (22) and a second foam carrier part (24), wherein the cut extending at least in the longitudinal direction (L) and the width direction (B), - applying a separating layer (4) to at least one of the two foam carrier parts (22, 24) on a predetermined surface of this foam carrier part, - bringing together the two foam carrier parts (22, 24) in such a way that the separating layer (4) is arranged between the first foam carrier part (22) and the second foam carrier part (24), wherein the layer (4) being arranged between the two foam carrier parts (22, 24) in such a way that the thickness of at least one of the two foam carrier parts (22, 24) varies as viewed in the width direction (B), wherein the two interconnected foam carrier parts (22, 24) being cut in a further method step and the separating layer (4) between the foam carrier parts (22, 24) also being cut during the further cut, characterized in that when the foam carrier is cut into a first foam carrier part and a second foam carrier part, the foam is compressed in its thickness direction (D), wherein the degree of this compression varying over the width direction (B) and the first cut being carried out in an at least partially compressed state of the foam.

2. Method according to claim 1, characterized in that the further cut is produced in a cutting plane that extends in the thickness direction and in the longitudinal direction (L).

3. Method according to at least one of the preceding claims, characterized in that the further cut is arranged in a region of the foam carrier in which the separating layer (4) extends in the vicinity of one of the two upper sides of the composite formed from the foam carrier parts (22, 24).

4. Method according to at least one of the preceding claims, characterized in that a strip extending in the longitudinal direction (L) and width direction (B) is separated from the composite of the joined foam carrier parts (22, 24).

5. Method according to at least one of the preceding claims, characterized in that the conveyor rollers are designed such that they have projections (12a, 14a) and recesses (12b, 14b), wherein at least one projection (12a, 14a) of one conveyor roller engages in a recess (14b, 12b) of the other conveyor roller.

6. Method according to at least one of the preceding claims, characterized in that a straight cutting tool is used and the foam is allowed to reset after the cutting process.

7. Sealing tape made up as a sealing tape roll (10), namely a foam tape (1) having a first foam carrier part (22) and a second foam carrier part (24) and a separating layer (4) which is arranged between the first foam carrier part (22) and the second foam carrier part, wherein the foam tape extending in a length direction (L), a width direction (B) perpendicular thereto and a thickness direction (D) perpendicular to the length direction (L) and the width direction (B), wherein the foam tape (1) having on one surface an adhesive layer (4) and this surface extends in the length direction (L) and the width direction (B), wherein the separating layer (4) completely separates the two foam carrier parts (22, 24) from one another and extends at least in sections from a first surface to a second surface and extends both in the length direction (L) and in the width direction (B) as well as in the thickness direction (D), characterized in that the adhesive layer (8) is arranged on a surface opposite the said first surface, wherein the adhesive layer (8) being an assembly self-adhesive layer (8), by which the sealing tape (1) can be fastened to a building structure, and a cover layer is arranged on the first surface, wherein this cover layer having a lower air permeability than the foam carrier.

8. Foam tape according to claim 7, characterized in that a further layer (16, 18) is provided, which is a cover layer that at least largely covers the entire respective surface.

9. Foam tape according to claim 8, characterized in that the further layer (16, 18) consists of a foam and in particular an airtight foam.

10. Foam tape according to at least one of claims 7 - 9, characterized in that the separating layer (4) extends into the cover layer (18) or up to the cover layer (18).