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 for use in construction, for example, for sealing facades, frames, and the like, against masonry or other building components, such as sealing window frames against masonry. Such sealing tapes, also known as multifunctional tapes, can be used, for example, to create an airtight seal between the areas to be sealed. It is known in the prior art to use combinations of foam, in particular impregnated foam, and membranes. This impregnated foam expands and thus achieves a sufficient density to fill the gaps to be sealed. It would be desirable for the membranes to also be firmly pressed against the respective joint faces by the impregnated foam.However, practical experience has shown that in a reset state, the expansion of the foam is at least slightly hindered precisely at those points where the layers are arranged. In this way, the required airtightness values ​​(at least the BG-R according to DIN 18542:2009-07) cannot always be achieved.

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

[0003] Furthermore, so-called multifunctional tapes are known from the prior art. However, achieving the required airtightness with these tapes can sometimes be difficult or only feasible with a high material input (using strong compression during application).

[0004] Therefore, current technology sometimes strives to increase the airtightness of such tapes. This often fails because the films used do not fully adhere to the contact surface with the building element to be sealed or to the building structure itself. It can also happen that a film, for example a membrane, is self-adhesive and, when compressed with a foam, the elements stick together, preventing them from expanding or opening further, thus failing to reliably seal the element against the building structure. This is particularly problematic when the profiles of plastic or metal windows and doors have grooves or ribs on their end faces intended to allow coupling with other profiles.

[0005] Foam bodies are known in the art that incorporate a separating layer, membrane, film, or similar material to ensure the required airtightness. Various methods are known for manufacturing such sealing elements. For example, it is known to create a slit in the foam body and insert the sealing element, such as a membrane, into this slit. Therefore, these methods are sometimes relatively cumbersome in the prior art.

[0006] DE 10 2016 114227 A1 describes a method for producing a foam sealing tape starting from a foam carrier which, during its transport along a predetermined transport direction, is cut into at least two completely separate foam carrier strips. The essential feature is that the distance between these foam carrier strips is increased. In a variant of this method, an extra-wide adhesive tape strip is guided around three sides of each of the strips in such a way that, after the strips are rejoined along their width, this adhesive tape strip alternately forms an upper and lower outer surface of the resulting composite of the foam carrier strips.In a sealing tape produced according to this method, the adhesive tape strip runs along an upper or lower outer surface of the sealing tape perpendicularly or at an angle to the thickness direction between the upper outer surface of the sealing tape and the lower outer surface of the sealing tape, and then along the other outer surface.

[0007] The present invention is therefore based on the objective of producing a sealing tape which can be manufactured in a simpler manner than in the prior art.

[0008] In the prior art, the respective separating layers typically run perpendicular to the direction of extension of the tape, and, in an installed state, parallel to the room's interior and exterior surfaces. This means that if this foam body undergoes even brief expansion, it is conceivable that the membrane inside could tear or develop openings that would compromise the overall seal.

[0009] The present invention is therefore also based on the objective of increasing the durability of such sealing tapes and 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, more generally, a separating element.

[0010] These objectives 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 transported in a conveying direction. This foam carrier extends in a longitudinal direction parallel to the conveying direction, in a lateral direction perpendicular to the longitudinal direction, and in a thickness direction, the thickness direction being perpendicular to both the longitudinal and lateral directions. Preferably, the foam carrier has at least one first surface extending in both the longitudinal and lateral directions.

[0012] In a further process step, the foam carrier is preferably cut into a first foam carrier part and a second foam carrier part by a first cut, each forming a second surface, 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 in the width direction.

[0013] In a further process step, a separating layer is applied to at least one of the two foam carrier parts on a predetermined surface. The two foam carrier parts are then joined such that the separating layer is positioned between the first and second foam carrier parts. Preferably, the separating layer extends, at least partially, in a direction deviating from the longitudinal (L) and lateral (B) directions, forming at least one region with a minimum distance (D1, D2) in the thickness direction (D) to a first surface.

[0014] In a preferred embodiment, the separating layer is arranged between the two foam support parts in such a way that the thickness of at least one of the two foam support parts varies in the width direction.

[0015] Preferably, a strip extending in the longitudinal direction (L) and the 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 to the respective foam carrier part, for example, by gluing. However, it would also be possible to apply a flowable substance to the respective foam carrier part, which forms the separating layer. Combinations of these two measures are also possible. In a preferred method, this separating layer also causes the foam carrier parts to adhere to one another.

[0017] Preferably, the separating layer is at least substantially airtight. For the purposes of this invention, airtightness means that the air permeability is less than 20 l / m² < x sec, preferably 10 l / m² < x sec, more preferably less than 5 l / m² < x sec, and particularly preferably less than 2 l / m² < 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 cm² < x sec and a test negative pressure of 0.5 mbar.

[0018] In another preferred method, the two foam support parts are spaced apart from each other after cutting. For example, the first foam support part can be lifted further away from the first foam support part, thus increasing the distance between the two foam support parts.

[0019] Preferably, the separating layer does not run parallel to the lateral direction, or only partially parallel, but is at least partially inclined and / or curved relative to the lateral direction. Particularly preferably, the separating layer has a wavy shape in the aforementioned lateral direction. However, the layer is also preferably parallel to the longitudinal direction (at least partially).

[0020] In another preferred method, the foam is impregnated. It is particularly preferred that the foam is impregnated before the aforementioned (especially the first) cutting operation is carried out. It is particularly preferred that the foam be impregnated to delay its recovery.

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

[0022] In another preferred method, the foam substrate is cut in a straight line, and in particular in the width direction. Therefore, a cutting tool that is essentially straight is particularly preferred. This simplifies the cutting process. For example, a rotating cutting tool or one that moves back and forth can be used.

[0023] In this process, the foam substrate is cut in a state that is at least partially compressed. The degree of this compression can vary in the width direction of the foam substrate.

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

[0025] It is intended that the foam carrier is compressed at least section by section in its thickness direction, with the degree of this compression varying across the width direction and the first cut being made in a state of at least partial compression of the foam.

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

[0027] Furthermore, it would also be possible for the respective wave structures of the two shafts to interlock, meaning, for example, that the spacing adjustment devices of the first roller engage in corresponding recesses of the second roller without the conveyor rollers touching. 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 in the foam carrier compressed by these conveyor rollers. Preferably, overcompression of the foam carrier is also achieved, i.e., compression after which the foam (especially in sections) remains compressed (like a film). In a preferred method, the foam is therefore compressed to varying degrees in the width direction and / or conveyed in different positions (with respect to the thickness direction).

[0029] In this way, even with a straight cutting tool, a wavy cut can be produced after the foam has been reset, for example.

[0030] Therefore, a straight-running cutting tool is preferably used, allowing the foam to spring back.

[0031] Preferably, a cut is produced along the thickness direction of the foam substrate during or after compression, which, after the foam has recovered, exhibits at least one minimum and at least one maximum, and preferably a plurality of minima and a plurality of maxima (whereby these minima and maxima preferably alternate). Preferably, the cut produced has a periodically repeating shape in the width direction.

[0032] In this process, the foam is compressed in its thickness direction, with the degree of this compression varying across the width direction, and the first cut is made in a foam that is at least partially compressed.

[0033] In another preferred embodiment, the two foam support parts are rejoined and, in particular, bonded together. The separating layer can be a self-adhesive layer that is ultimately bonded to both foam support parts. Alternatively, a coating, preferably one with adhesive properties, could be applied, for example, sprayed onto the relevant surface of one of the foam support parts, and especially onto the lower foam support part.

[0034] Preferably, in an uncompressed state, the separating layer in the composite of the joined foam carrier parts has a wavy profile in the width direction, which has at least one valley area shifted in the thickness direction relative to the center line and at least one mountain area shifted in the opposite direction in the thickness direction.

[0035] It is often difficult to keep the distance between the inserted separating layer, for example at the crest or trough of the wave, and the adjacent first surface small enough to ensure sufficient airtightness in the gap not traversed by the separating layer within the sealing tape. Therefore, this strip not traversed by the separating layer is preferably removed by at least a second cut.

[0036] In a preferred method embodiment, the separated strip is therefore designed to extend, at least section by section, over a thickness that corresponds at least to the minimum distance between the separation layer and the first surface. A greater thickness is at least to some extent harmless, since this would merely remove the respective crest or trough (at least partially), but the separation layer would still extend to the surface newly created by the cut and thus guarantee sufficient airtightness over the entire thickness.

[0037] Furthermore, it is preferred that a further strip is separated from the composite of the joined foam carrier parts, wherein the further strip is preferably separated from the side of the composite of the joined foam carrier parts opposite the first strip in the thickness direction. This method variant is particularly advantageous because it allows the area not penetrated by the separating layer on both sides of the composite of the joined foam carrier parts to be removed, thus ensuring, both in the area of ​​the wave crests and troughs, that the separating layer extends to the surface newly created by the respective cut and can therefore guarantee sufficient airtightness across the entire thickness.

[0038] In a further preferred method, a further layer and in particular an additional adhesive layer is arranged on at least one surface of at least one foam support or at least one foam support part, in addition to the separating layer between the foam support parts mentioned above.

[0039] This adhesive layer is preferably a self-adhesive layer, by means of which the sealing tape can be glued to at least one building component during assembly.

[0040] Preferably, the adhesive layer is a double-sided adhesive layer.

[0041] This adhesive layer is particularly preferably adhered to the respective surface (especially a lower surface or an upper surface of the foam support part). This adhesion of the adhesive layer can also occur during further transport of the foam support or foam support part.

[0042] In another preferred method, the conveyor rollers transport the foam carrier at least temporarily in such a way that areas of the upward-facing surface lie at least partially below areas of the downward-facing surface. In other words, the foam carrier is preferably curved so strongly that, viewed in the width direction, the thickness difference between the highest and lowest areas is greater than the thickness of the foam in the compressed state.

[0043] Preferably, the foam carrier is guided by conveyor rollers that interlock at least partially (but do not touch). Thus, it is possible for one conveyor roller to have projections as spacing adjustment devices, which engage in recesses of the other conveyor roller.

[0044] In this process, the foam is compressed in its thickness direction, with the degree of compression varying across its width. The aforementioned first cut is then performed in a foam that is at least partially compressed. The cutting process is particularly preferably carried out during or after compression, and especially immediately after compression. For example, a cutting element could be arranged directly downstream of the aforementioned conveyor rollers. This cutting element could be, for instance, one or more saw elements that perform the cuts. Such a cutting element could, for example, move across its width to facilitate the cutting process. A preferred embodiment of such a cutting element is a rotating horizontal band knife.

[0045] In a further preferred method, an additional layer is arranged on 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 aforementioned separating layer between the foam carrier parts and also in addition to the adhesive layer that serves to fasten the sealing tape to a building structure.

[0046] The additional layer could, for example, be a coating such as a (non-woven) fabric 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.

[0047] In another preferred method, the additional layer arranged on at least one of the aforementioned surfaces is a cover layer which covers the respective surface at least largely completely. This cover layer can, in particular, be bonded to the said surface.

[0048] In another preferred method, this additional layer or top layer is another foam layer.

[0049] Preferably, the additional layer is a top layer that has a lower air permeability than the aforementioned foam carrier. This top layer is preferably airtight.

[0050] In another preferred method, the additional layer or top layer is applied before cutting the foam substrate. Particularly preferably, the at least one top layer is also applied before compressing the foam substrate in its thickness direction.

[0051] This top layer is particularly preferably 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 on the upper or lower surface.

[0052] In another preferred method, a cover layer is also applied to a further (preferably first) surface of the foam substrate. 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 substrate.

[0053] In another preferred method, two cover layers are positioned opposite each other and / or are separated from each other by a foam carrier part.

[0054] In another preferred method, the thickness direction of the foam carrier is perpendicular to the two aforementioned cover layers.

[0055] 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.

[0056] In another preferred method, an assembly is produced in which a first cover layer is formed, followed by the first foam support part, then the aforementioned separating layer, then the second foam support part, and finally another cover layer. The layer between the foam support parts can also be referred to as a barrier layer.

[0057] Preferably, the cover layers and the two foam support parts are bonded together, at least temporarily, by adhesive. Preferably, one cover layer is bonded to each foam support part, at least temporarily, by adhesive.

[0058] The top layer can serve to improve the guidance of the foam carrier during transport. It is particularly preferred that the top layer facilitates the section-by-section compression of the foam carrier before the first cut is made. In particular, the top layer can serve to minimize the minimum distance between the cut and the nearest first surface.

[0059] The top layer can be removed separately, particularly if it is temporarily bonded to the foam backing. Alternatively, and more preferably, the top layer is removed along with the separated strip after the second cut. By selecting the appropriate top layer and foam backing material, a composite material suitable for further use can be produced.

[0060] In another preferred method, all layers are compressed, i.e., in particular both the foam carrier parts (or its precursor, which is still a single piece before the cut is made) and the two arranged cover layers.

[0061] To ensure that the separating layer in the sealing tape extends across its entire thickness, it is usually necessary to cut off an upper and lower strip (in the direction of thickness) that are not (completely) penetrated by the separating layer along the thickness direction. If no further profitable use of these cut-off strips is 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 stacked on top of each other in a single process and / or to manufacture the sealing tape from several layers of cut-off strips, which may be bonded together.

[0062] Therefore, in a preferred method embodiment, in an uncompressed 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. 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(s) are preferably arranged such that sealing strips of equal thickness are formed. 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 the case that the first surface has been removed by a second cut, it is preferred that the third cut nearest to the surface produced by the second cut is preferably located exactly HD / (n+1) away from this surface.

[0063] It is further preferred that, in the case of multiple third cuts (n > 1), the third cuts are equidistant to each other with respect to the thickness direction.

[0064] In a further preferred method, the interconnected foam carrier parts are cut in a further process step, and preferably at least one further (second or fourth) cut is produced in a cutting plane, extending in the thickness direction and in the longitudinal direction. Preferably, this further (second or fourth) cut is made after the sealing tape has been wound into a compressed sealing tape roll, more preferably into a large roll.

[0065] Preferably, at least one further (second or fourth) cut and preferably the several further (second or fourth) cuts, which ultimately lead to the rollers, are perpendicular to the first cut that separates the foam carrier into the foam carrier parts.

[0066] In a preferred method variant, m further (second or fourth) cuts are made, wherein 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).

[0067] In order to ensure that the separating layer extends (at least almost) completely through the sealing strips produced by the further (second or fourth) cut(s) in the thickness direction, a preferred embodiment provides that these further (second or fourth) cuts are arranged in the area of ​​a minimal 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.

[0068] To increase the area where the separation layer intersects with a surface created by a third cut, it could be advantageous for the wave profile to have a lower slope and / or, for example, to pass through a plateau when the first cut is made in this area. This could be achieved, for example, by appropriately compressing the foam substrate before and / or during the first cut.

[0069] Within the scope of the present invention, an airtight foam is understood to have an air permeability of < 50 l / (m²s), preferably < 30 l / (m²s), and particularly preferably < 10 l / (m²s). The aforementioned values ​​refer to measurements of a test specimen 6 mm thick with a test area of ​​100 cm² at a differential pressure of 0.5 mbar using a Frank device type 21443. Preferably, a joint sealing tape can be obtained in this way that meets the requirements of DIN 18 542, stress group R.

[0070] Preferably, the impregnated foam sheet is transported by the aforementioned conveyor rollers, compressed, and preferably cut in the middle, particularly with a (belt) knife. Stepped rollers are especially preferred as conveyor devices, with a knife running between them, for example.

[0071] In this further (second or fourth) cut (cutting process), the aforementioned separating layer between the foam carrier parts is also cut.

[0072] In a further preferred method, an adhesive layer is applied to at least one surface of one of the two foam support parts in at least one further process step. In particular, the adhesive layer is applied to exactly one of the foam support parts. This adhesive layer preferably lies in a plane to which the width and length directions of the foam support are parallel.

[0073] This adhesive layer can preferably be applied to a surface, or outer surface, of either the first or the second foam carrier part, and thus to a top or bottom surface. The adhesive layer could also be applied to a surface, or outer surface, of either the first or the second cover layer. This adhesive layer preferably serves to bond the sealing tape to one of the two components between which the sealing tape is to be placed.

[0074] In a further preferred method, the additional (second or fourth) cut is arranged in a region of the foam carrier where the separating layer extends near one of the two surfaces of the composite formed from the foam carrier parts. In this way, it is ensured that in the finished product, for example, a sealing tape roll, the separating layer is located either close to the upper or close to the lower surface on one side. Preferably, the additional (second or fourth) cut is thus arranged in a region of the foam carrier where the first cut has created a crest or trough on the surface of one or both foam carrier parts.

[0075] Since the separating layer within the foam body is curved overall, for example in a wave-like and / or step-like manner, the further (second or fourth) cut is preferably made in such a way that the separating layer moves, as it were, from one side, for example the lower surface, to the opposite side, for example the upper surface.

[0076] In this way, as explained in detail below, an essentially complete sealing of the foam body can be achieved.

[0077] The separating layer is particularly preferably located at least partially 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.

[0078] Particularly preferably, the further (second or fourth) cuts are arranged such that in an area between two adjacent cuts the separating layer runs from a lower area of ​​the foam body to an upper area of ​​the foam body, wherein the layer preferably does not extend in a straight line in the thickness direction but assumes an oblique and / or curved course both with respect to the thickness direction and with respect to the width direction.

[0079] The present invention further relates to a sealing tape, namely a foam tape prepared as a sealing tape roll, which has a first foam carrier part and a second foam carrier part, as well as 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 longitudinal direction, a width direction perpendicular thereto, and a thickness direction perpendicular to the longitudinal and width directions, wherein preferably the foam tape has an adhesive layer on a surface and this surface extends in the longitudinal and width directions.

[0080] Preferably, this separating layer arranged between the foam carrier parts is essentially or completely airtight and can therefore also be referred to as a barrier layer.

[0081] The interface extends in the longitudinal, lateral, and thickness directions. This means that the interface does not only run in a plane parallel to any of the directions mentioned above, but that it extends in all directions. At least in the lateral direction, the interface is curved, at least in sections, namely in a wave-like or sinusoidal shape.

[0082] 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.

[0083] The separating layer preferably extends in the longitudinal direction of the sealing tape and, in particular, also runs parallel to this longitudinal direction.

[0084] Preferably, the separating layer has a lower gas permeability than the foam carrier parts.

[0085] In a further preferred embodiment, the separating layer is a film layer and / or a separating layer consisting of a substance applied and, in particular, sprayed onto at least one foam support part.

[0086] Preferably, the aforementioned separating layer also exhibits adhesive properties.

[0087] This separating layer is particularly preferably in contact with both the first foam support part and the second foam support part, at least partially and preferably substantially completely. Preferably, this separating layer can adhere to at least one foam support part and preferably to both foam support parts.

[0088] In another advantageous embodiment, the foam support parts are made of the same material.

[0089] The separating layer within the foam body is particularly preferably arranged such that it forms a predetermined angle with the thickness direction, this angle preferably varying. This angle particularly preferably varies across the width direction by at least 10°, more preferably by at least 20°, and more preferably by at least 30°.

[0090] Thus, it is possible that, for example, at the edges of the sealing tape, the angle that the separating layer forms with the thickness direction is very high, for example greater than 70°, preferably greater than 80°.

[0091] Particularly preferably, in a central region, this angle is significantly smaller, i.e., the separating layer runs 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 most preferably less than 30°. This is explained in more detail with reference to the figures.

[0092] In a particularly preferred embodiment, the area of ​​greatest slope of the separating layer is arranged off-center relative to the width direction. It is especially preferred that the area of ​​greatest slope of the separating layer is shifted in the width direction relative to the center of the sealing tape towards the side surface of the sealing tape facing the interior of the room when installed. This ensures that the sealing tape has a greater degree of tightness on the interior half than on the exterior half.

[0093] The separating layer inside the foam body is particularly preferably arranged in such a way that it essentially (almost completely) prevents air from passing from one side surface of the sealing tape towards the other side surface of the sealing tape.

[0094] In another preferred embodiment, the foam of the foam support part is a polyurethane foam, and in particular an impregnated polyurethane foam. Preferably, this polyurethane foam is impregnated for the purpose of delayed recovery.

[0095] A layer thickness of the two foam carrier parts together is particularly preferred to be greater than 2 mm, preferably greater than 4 mm, preferably greater than 6 mm.

[0096] Particularly preferred is the combined thickness of the two foam support parts 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.

[0097] In another 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 support part via an adhesive, and particularly preferably it can be bonded to a foam support part in such a way that the separating layer also holds the two foam support parts together.

[0098] 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.

[0099] Preferably, the separating layer is designed to be flexible and / or stretchable.

[0100] The foam preferably has a density greater than 20 kg / m³ in an unimpregnated state, preferably greater than 25 kg / m³. The foam preferably has a density less than 80 kg / m³ in an unimpregnated state, preferably less than 70 kg / m³, preferably less than 60 kg / m³, preferably less than 50 kg / m³, and particularly preferably less than 40 kg / m³.

[0101] Preferably, the impregnating agent causes an increase in density of more than 10 kg / m³, preferably more than 20 kg / m³, and preferably more than 30 kg / m³. Particularly, the impregnating agent causes an increase in density of less than 300 kg / m³, preferably less than 200 kg / m³, and most preferably less than 100 kg / m³.

[0102] The aforementioned separating layer, which is positioned between the foam supports, 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. Alternatively, instead of a film, (adhesive) materials made of rubber, acrylic resin, film-forming plastics in general, and the like can also be used.

[0103] Particularly preferably, the sealing tape is designed such that, in an assembled state, the separating layer between the foam carrier parts essentially prevents air penetration (especially in the width direction of the sealing tape).

[0104] In a preferred embodiment, the two foam carrier parts are completely separated from each other by the separating layer.

[0105] Preferably, an adhesive layer, and in particular a self-adhesive layer, is arranged on an outer surface of the composite of the two foam carrier parts. This adhesive layer preferably extends in the longitudinal and lateral directions of the sealing tape. In particular, this adhesive layer serves to fasten the sealing tape to a building structure.

[0106] In a further preferred embodiment, at least one foam support part has an additional layer, preferably a cover layer, arranged on it in addition to the separating layer and the adhesive layer. This cover layer can also consist of a foam. Particularly preferably, this is a foam that has a lower air permeability than the foam mentioned above and which can, in particular, be airtight.

[0107] This top layer, through which the adhesive layer advantageously does not extend, effectively prevents air from passing through. The release layer extends into the top layer.

[0108] Preferably, the top layer is a foam. It is advantageous that during manufacturing, at least one further foam layer is applied as a top layer to the foam carrier, and in particular to one of its upper or lower surfaces. As mentioned, this can be an airtight foam. It is particularly preferred that the foam of the at least one top layer and the foam of the foam carrier parts are different.

[0109] In a further advantageous embodiment, a cover layer is also arranged on the other foam carrier part. Preferably, this first layer and the second layer are arranged such that the two foam carrier parts are positioned between these two cover layers, particularly in the thickness direction of the sealing tape. This second cover layer is also designed in the same way as the first cover layer mentioned above. Thus, this cover layer is preferably also a foam layer and / or a substantially airtight cover layer. Preferably, the first cover layer comprises a foam that is as closed-cell as possible and preferably as airtight as possible. Besides being airtight, this foam has the task of adapting as well as possible to the commonly occurring mineral substrates of a building structure. It is possible for this first cover layer or this foam to be impregnated.However, this is not absolutely necessary.

[0110] The second outer layer preferably consists of a foam that is as closed-cell and / or as airtight as possible. However, it is also possible for both outer layers to have the same structure or to be identical. This second outer layer, or the foam in question, does not necessarily have to be impregnated.

[0111] Preferably, the aforementioned adhesive layer, preferably self-adhesive, is applied to the outer surface of this cover layer to aid assembly. This side of the product faces the building component, for example, a window frame or the like.

[0112] Another advantage is the aforementioned top layer 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.

[0113] Preferably, the at least one top layer has a layer thickness greater than 0.5 mm, preferably greater than 1 mm, preferably greater than 2 mm.

[0114] Preferably, the at least one top layer has a layer thickness that is less than 30 mm, more preferably less than 20 mm, more preferably less than 15 mm, more preferably less than 10 mm and most preferably less than 6 mm.

[0115] As mentioned, at least one of the top layers, and preferably both top layers, are made of an airtight material, and in particular an airtight foam.

[0116] In a preferred embodiment, it is provided that at least on the first surface a covering layer or, more generally, an element made of a substantially airtight foam is arranged.

[0117] It is also conceivable, however, that the cover layers are not bonded to the foam substrate or are only temporarily bonded. They thus form auxiliary layers, which are preferably applied to the foam substrate before profiling to support its profiling. In particular, they space the foam substrate away from the rollers, thereby 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.

[0118] 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 the 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 section remains even in the area of ​​the corrugations present in the foam carrier part and introduced during the cutting process described above. This ensures sufficient stability of the foam carrier part and, for example, reduces 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 portion existing on at least one side between the at least one corrugation trough and the surface of the foam carrier part cut off, so that the respective corrugation trough now (at least almost) contacts the surface newly created by the cutting process. The cut-off foam portions can be recycled.

[0119] In an alternative or supplementary embodiment, the sealing tape for sealing building structures extends in a longitudinal direction and in a lateral direction perpendicular to the longitudinal direction. Furthermore, the sealing tape has a first surface which extends at least substantially in the longitudinal and lateral directions, and a second surface which also extends in the longitudinal and lateral directions and which is spaced apart from the first surface and, in particular, is also parallel to the first surface.In this sealing tape, the first and second surfaces each serve to conform to the building components (and in particular to different building components), wherein the sealing tape comprises at least one foam core and a separating element that 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 at least on the first surface a layer or, more generally, an element made of a substantially airtight foam is arranged.

[0120] Such a layer (also referred to above as a top layer) or, more generally, such an element made of a substantially airtight foam could – as already described above – in a preferred embodiment also be provided on a (first) surface of a sealing tape as previously described (preferably intended for contact with a building structure). It should therefore be noted that all subsequent features can also be combined with the features described above with regard to the first alternative.

[0121] In a preferred embodiment, the separating element is suitable and intended to substantially prevent, and preferably prevent, the passage of a flowable medium through the sealing tape.

[0122] In a further preferred embodiment, the layer covers the surface on which it is arranged to more than 30%, preferably more than 50%, preferably more than 70%, preferably more than 80%, preferably more than 90%, and most preferably substantially completely.

[0123] However, it would also be conceivable that only a relatively thin band is applied to the surface as a layer, which accordingly only covers a small area of ​​10% or even less.

[0124] In a preferred embodiment, the separating element is a separating layer which extends at least section by section from the first surface to the second surface. It is possible for this separating layer to be arranged on an outer surface of the foam body, but it would also be possible and preferred for the separating layer to be arranged inside and / or run within the foam body.

[0125] In a further advantageous embodiment, the foam body comprises a first foam body section and a second foam body section, which are at least partially separated from each other by the separating layer. It is possible that these sections are completely separated from each other, but it would also be conceivable that these sections are connected to each other via a connecting section.

[0126] 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 essentially completely separates these foam bodies.

[0127] However, it would also be conceivable that a slot is arranged in the foam body and the separating layer runs inside this slot.

[0128] Advantageously, this layer (arranged on the first surface) is a flexible layer. It is particularly preferred that this layer is arranged across the entire surface of the respective foam body, and especially on the surfaces of both foam bodies. This additional airtight layer is particularly preferably pressed against the building components during installation. It is possible and preferred that the separating layer adjoins this layer or foam layer, thereby increasing the contact area with the respective building component, particularly with the aid of the foam layer.

[0129] 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 self-adhesive mounting layer and the respective multifunctional tape.

[0130] In a further advantageous embodiment, the foam in a fully rebounded state has a density of at least 30 kg / m 3< , preferably at least 40 kg / m 3< , and particularly preferably at least 50 kg / m 3< .

[0131] In a further advantageous embodiment, the foam in a fully rebounded 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< .

[0132] 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.

[0133] In a further advantageous embodiment, the additional layer or the airtight layer has a density of at least 5 kg / m 3< , preferably at least 7 kg / m 3< , and particularly preferably at least 10 kg / m 3< .

[0134] In a further advantageous embodiment, the additional layer or the airtight layer has a density of at most 100 kg / m 3< , preferably at most 70 kg / m 3< , and particularly preferably at most 50 kg / m 3< .

[0135] In another advantageous embodiment, the material of the foam bodies is a PU foam.

[0136] Preferably, the separating layer is a release film. However, a separating layer can also consist of an adhesive layer or an adhesive.

[0137] In a further advantageous embodiment, the separating layer has a thickness 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.

[0138] 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.

[0139] Preferably, the separating layer is attached to at least one foam body by means of an adhesive. This adhesive is preferably an acrylate-based adhesive. However, a rubber-based adhesive could also be used. Other self-adhesive materials could also be used.

[0140] In a further advantageous embodiment, the separating layer is a liquid-tight separating layer. In this way, the passage of liquid and / or vapor through said layer can be prevented (or, in the case of vapor, slowed down).

[0141] 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 glued to at least one of the two foam bodies and / or foam body sections. Particularly preferably, the separating layer is glued over its entire surface to said foam body and / or foam body section.

[0142] In a further advantageous embodiment, an adhesive layer is arranged at least on the further (preferably the second or fourth) surface, that is, in particular the surface opposite the aforementioned first surface. This can, for example, be a self-adhesive mounting layer. In this way, the sealing tape can be attached to a building component. Particularly preferably, the separating layer adjoins the aforementioned further layer, and in this way, the contact area with the building component can be increased with the aid of this foam layer.

[0143] 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 additional layer is not impregnated or resilient.

[0144] The foam tape is packaged as a sealing tape roll, and it is possible that after unrolling the foam will spring back, especially in the area to be sealed.

[0145] In another advantageous embodiment, the layer is made of a closed-cell foam. This also ensures airtightness.

[0146] In general, the contact area is greatly increased by the help of the airtight foam layer on the building structure (compared to the edge of a membrane).

[0147] A soft, airtight foam that adapts to uneven surfaces adheres better to the building surface. It is preferably airtightly connected to the inner membrane.

[0148] The foam layer offers advantages on the profile side. For example, it allows bridges to be filled and prevents uncontrolled swelling between grooves and ribs. Furthermore, the additional layer prevents air from circulating around the membrane on the profile side between these ribs.

[0149] In a further preferred embodiment, the layer has a lesser thickness than the foam body. In particular, the layer has a lesser thickness than the foam body when it is in its returned state. The thickness of this layer is most preferably at most 50% of the thickness of the foam body, more preferably at most 40%, more preferably at most 30%, more preferably at most 20%, and most preferably at most 10%.

[0150] The separating layer also extends in the thickness direction of the sealing tape. In the width direction, the separating layer runs in a wavy pattern and thus, at least in sections, obliquely between the foam elements, and therefore also extends in the width direction of the sealing tape.

[0151] In a further advantageous embodiment, the sealing tape comprises several foam bodies, which are particularly preferably separated from one another by separating layers. For example, there can be three foam bodies separated by two such separating layers. These separating layers can run essentially parallel to each other.

[0152] In a further advantageous embodiment, when the foam body is fully reset, the separating layer extends over a smaller area in the thickness direction than the foam body itself. A slightly smaller area is particularly preferred. For example, in the areas where the separating layer ends, depressions may be formed in the foam body when it is reset. The aforementioned layer preferably rests in this depression, thus resulting in a higher degree of sealing.

[0153] For example, a building arrangement with a first building structure and a second building structure is still provided, wherein at least in sections a sealing strip of the type described above is arranged between these building structures.

[0154] Advantageously, the construction arrangement consists of a window or window frame and the adjoining 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 component, for example, a wall (or between a door or door frame and a facade profile).

[0155] The present invention further relates to a method for producing a sealing tape according to claim 1. First, a foam body is provided. Preferably, this foam body is provided with a separating element which at least hinders (i.e., hinders more than the foam body) the passage of a flowable and, in particular, gaseous medium through the sealing tape.

[0156] The first foam body is joined to a second foam body, with a separating layer being arranged between the first and second foam bodies. This is done according to the method defined in the claims.

[0157] In a further process step, another layer is applied to a surface of both the first and second foam bodies. Specifically, this is a surface that serves to adhere to one of the building components.

[0158] In particular, this additional layer is a foam layer.

[0159] Preferably, this additional layer runs parallel to the first foam body and / or the second foam body.

[0160] Preferably, this layer is a flexible layer. Particularly preferably, this further layer is an essentially airtight layer.

[0161] In another preferred method, the foam bodies are attached to one another. It is possible that the separating layer is glued to the first foam body, and then the second foam body is also glued to this layer. For example, the separating layer can be designed as a double-sided adhesive.

[0162] In another preferred method, the foam bodies are impregnated. It is particularly preferred that the foam bodies are impregnated before they are brought together with the aforementioned separating layer.

[0163] In a further advantageous embodiment, an adhesive layer is applied to the surface opposite the first layer of the foam bodies. In this way, the foam bodies can be sandwiched between the adhesive layer and the aforementioned layer.

[0164] However, it would also be possible to arrange another layer of foam on the foam bodies in addition to the aforementioned layer. Thus, it is possible that the foam bodies are sandwiched between two further layers, and especially between layers of foam.

[0165] Further advantages and embodiments are shown in the attached drawings: These show: Fig. 1 an arrangement according to the internal prior art for producing a sealing tape; Fig. 2 a representation to illustrate the functioning of the Fig. 1arrangement shown; 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 view of a process product according to a method according to the applicant's internal prior art; Fig. 7 a representation to illustrate the problems in 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 produced in the method according to Fig. 11manufactured sealing tape; Fig. 13 a sectional view of an intermediate product of a preferred method variant; Fig. 14 a schematic representation of a preferred method variant; Fig. 15 a schematic representation of a further preferred method variant; Fig. 16 a sealing tape arrangement according to the prior art; Fig. 17 a sealing tape arrangement in an assembly state; and Fig. 18 a further representation of a preferred sealing tape arrangement.

[0166] Figure 1 Figure 1 shows a schematic representation of a procedure for manufacturing a sealing tape. A first conveyor roller 12 and a second conveyor roller 14 are provided. A foam carrier 2 is conveyed between these two rollers. It can be seen that the conveyor roller 12 has spacer adjustment devices, for example, projections or additional discs 12a, and that recesses 12b are formed between these discs 12a.

[0167] Accordingly, the conveyor roller 14 also has projections or discs 14a, as well as recesses 14b arranged between them. The two conveyor rollers 12 and 14 are offset from each other (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 at least lie opposite them.

[0168] In this way, the foam carrier 2, as in Fig. 1 shown, conveyed in a wave-like manner. Reference symbol 5 denotes a cutting blade that cuts the foam during or after conveying it through the rollers or cylinders. This cuts the impregnated foam sheet or foam carrier 2 (in Fig. 1 ) come out of the plane of the figure and are transported by the rollers 12, 14, thereby being compressed and preferably cut in its middle by the cutting element 5.

[0169] Figure 2 Figure 1 shows another representation of a foam carrier 2 conveyed in the direction of arrow F. This carrier 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 conveying of the foam 2, in the conveying direction F and thus also in the longitudinal direction L.

[0170] As can be seen from Fig. 1 and Fig. 2 This results in the use of stepped rollers, which ensure the wave-like compression of the foam. This also applies to... Fig. 2The stepped rollers 12 and 14 are shown at the top and bottom, and a cutting blade runs through the middle. As mentioned above, the foam carrier is a foam carrier known from the prior art and preferably impregnated. Advantageously, the foam carrier was impregnated before the cutting and conveying process.

[0171] Fig. 3Figure 1 shows a further process step for the production of a sealing tape. After compression (by the rollers 12, 14), cutting, and preferably subsequent decompression of the cut foam, corrugated foam carrier parts 22 and 24 are obtained. The foam carrier part 22, and preferably also the foam carrier part 24, has "peak areas" 22b and 24b, respectively, and "valley areas" 22a and 24a, respectively. A separating layer, such as a barrier layer, is inserted into the space created by the cut between the foam carrier parts 22 and 24.

[0172] Corresponding to the "mountain areas" 22b and "valley areas" 22a, the foam carrier part 24 also has "valley areas" 24a and "mountain areas" 24b. However, the respective "valley areas" are also too thick with respect to their distance from the lower surface 36 or upper surface 38 of the respective foam carrier parts, and consequently the problem can arise that the inserted film does not adequately seal the final product or ensure sufficient airtightness (air can flow past above and / or below the film or the sealing element in general, as described below with reference to Figure 7 is described in more detail.

[0173] Fig. 4Figure 1 shows a representation of a corresponding sealing tape 100 with an inserted film 4. The foam carrier parts 22 and 24 are positioned against each other so that they rest against the separating layer 4. Preferably, they are each bonded to the separating layer 4. Here again, it can be seen that there are large distances above the respective maxima and minima of the sealing tape's path to the respective lower and upper surfaces 36 and 38 of the sealing tape.

[0174] In a further step, which takes place in Fig. 5 As shown, the tape produced in this way is compressed again and preferably provided with a self-adhesive backing. This creates a so-called dock. The arrows in Fig. 5 This indicates the compression of the foam carrier in the thickness direction D.

[0175] Fig. 6 shows a representation of the sealing tape product manufactured according to the applicant's internal prior art.

[0176] Here you can see the two foam support parts 22 and 24 as well as the sealing element or separating layer 4, which runs between these foam support parts 22 and 24.

[0177] Reference numbers 32 and 34 refer to side surfaces of the sealing tape that, in a mounted state of the sealing tape, face the outside of the room and the inside of the room, respectively.

[0178] It can be seen that across the width B of the sealing tape, the layer does not run horizontally, but extends upwards in the thickness direction.

[0179] Fig. 7This illustrates the problems associated with a corresponding sealing tape in the prior art. It shows that while air does not pass through the sealing tape in a central area (as illustrated by arrow P3), parallel air paths still exist, as indicated by arrows P1 and P2. In particular, in the valley 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.

[0180] Fig. 8Figure 1 shows a procedure for the advantageous production of 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 prior art, the two rollers are positioned closer together, and it can be seen that the projections overlap. This is not strictly necessary, but advantageous.

[0181] By bringing the two shafts or the conveyor rollers 12 and 14 closer together, the support becomes significantly more curved, and in this way the wave profiles can be greatly increased. Preferably, the transition from a wave crest to a wave trough can thus be made even steeper.

[0182] The result of this is in Fig. 9shown in the form of a sealing tape 1. Here again, the foam support parts 22 and 24 are shown, but with the reference numerals D1 and D2, the significantly reduced thickness sections are indicated, through which air can still pass from the inner side surface 32 to the outer side surface 34 or from the outer side surface 34 to the inner side surface 32. Here again, an adhesive strip 8 is shown on the underside of the sealing tape.

[0183] Fig. 10Figure 1 schematically illustrates the course of the sealing strip or sealing element between the foam carrier parts 22 and 24. It shows that the slope of the separating layer 4 or barrier layer 4 changes continuously. In a central region II with respect to the width direction B of the foam carrier, the film has a very steep slope, which is evident from the relatively small angle α1 that this slope, or an imaginary geometric tangent T1, forms with the thickness direction D of the strip. In regions I and III, i.e., near the inner side surface 32 and the outer side surface 38, this slope is relatively small, which is clearly indicated by the large angle α2 (shown only for the left region I). As mentioned above as an advantageous embodiment, the region with the steepest slope of the separating layer is positioned 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 positioned in the center.

[0184] In the prior art, layer 4 extends over a larger area in the thickness direction of the tape. Reference numeral D4 designates the thickness section of the sealing tape within which layer 4 extends. Preferably, the ratio between this thickness section D4 and the total thickness D (of the substantially recessed sealing tape) is greater than 0.6. Preferably greater than 0.7, preferably greater than 0.8, and particularly preferably greater than 0.9.

[0185] This shows that the slope of the separating layer 4 or the barrier layer 4 within the foam body preferably changes significantly. Therefore, the separating layer 4 is preferably neither horizontally nor vertically arranged and has a curved profile, or at least a profile with a changing slope.

[0186] In addition to the possibilities shown in the figures, i.e., overcompression such that the foam remains compressed like a film, a thermal treatment with the same objective could also be carried out. For example, it would be conceivable to treat the surfaces 36 and / or 38 of the foam carrier part(s) thermally or chemically in such a way that a skin forms on the surfaces 36 and / or 38. Thermal exposure leading 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. Additionally or alternatively, a chemical surface treatment could be carried out, which would destroy the molecular bonds between or within the polymer chains.An acid or base treatment followed by neutralization would be conceivable.

[0187] As mentioned above, the separating layer 4 can be a film-like layer, but it is also possible that this separating layer is sprayed on. For example, a film-forming polymer dispersion could be used for this purpose. Thus, it is possible that the foam carrier is first cut into the two foam carrier parts 22 and 24, and then a substance is sprayed into the intermediate area, which subsequently forms the separating layer 4.

[0188] Preferably, to produce the foam body, the foam carrier 2 is cut, then one of the carrier parts is spaced apart from or removed from the others, and the separating layer 4 is inserted. Subsequently, the two foam carrier parts 22, 24 are brought back together.

[0189] Fig. 11Figure 1 shows another advantageous method for producing a sealing tape. Here, two further elements or cover layers or layers 16 and 18 are arranged on the upper and lower sides of the foam carrier 2. These two cover layers also consist of a foam or a foam sheet, for example. However, these foams 16 and 18 are airtight. They can be impregnated, but need not be. Preferably, they are bonded to the respective foam carrier part, for example, by means of a self-adhesive.

[0190] It would also be conceivable, however, that the cover layers 16 and 18 could be provided as auxiliary layers unconnected to the foam carrier 2. Preferably, they run towards the foam carrier 2 before profiling and support the profiling process. In particular, they space the foam carrier 2 away 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 create a steeper profile and a desired narrower definition of 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 room-side side surface 32 to the room-side side surface 34 or from the room-side side surface 34 to the room-side side surface 32 is minimized.

[0191] Fig. 12Figure 1 shows a corresponding representation of a sealing tape 1, in which several layers or elements are present. First, an upper foam layer 16, i.e., the airtight foam or the upper cover layer, is provided. This is followed by a first foam support part 22, then the separating layer 4, and the second foam support part 24. Below the second foam support part 24 is another foam layer 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 hugs the respective cover layers, but penetrates them section by section.

[0192] Reference numerals 32 and 34 again designate the interior and exterior surfaces of the sealing tape, respectively. As mentioned above, the sealing tape is supplied as a roll, meaning it would be wound onto a spool, with the spool's axis extending parallel to the width direction B. It can be seen that in this embodiment, air penetration through the separating layer 4 is prevented in the central area. Air also cannot pass through the upper and lower areas, as the cover layers 16 and 18 are airtight foam elements.

[0193] This allows the valleys, which are not airtight in themselves, to be closed off by the cover layers 16 and 18.

[0194] The two approaches can also be combined; on the one hand, relatively steep flanks of the separation layer 4 can be applied, and on the other hand, the additional cover layers 16 and 18 can also be applied.

[0195] This allows the following process steps to be preferably carried out. First, a foam sheet, and in particular a flexible polyurethane foam sheet, can be impregnated (optionally). 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 surfaces of the foam sheet. This can be done, for example, with double-sided adhesive tape. In a further process step, the foam sheet and the two foam sheets attached to it are profiled with rollers, in particular with very closely spaced rollers. In this way, as mentioned above, a steeper wave flank is obtained. Subsequently, the partially compressed foam sheet is cut into two foam carrier parts.

[0196] In a further (optional) process step, the web is unfolded or one of the two foam carrier parts is spaced apart from the other in order to insert a separating layer, for example a film or a coating.

[0197] In a further process step, the foam carrier parts 22, 24 are joined together.

[0198] In a further (optional) process step, the material is preferably cut to length. This cutting step can also be carried out after profiling. Finally, the foam carriers are (optionally) compressed into a roll, in particular a large roll, preferably with a self-adhesive layer 8. This large roll is cut off in a final process step to produce the individual rolls.

[0199] Figure 13Figure 1 shows a cross-sectional view of an intermediate product of a preferred process variant. The foam carrier 2 has already been cut into a first foam carrier part 22 and a second foam carrier part 24 by a first cut. A separating layer 4 has been introduced into the gap created by this cut. This layer makes full contact with the second surfaces created by the cut. The first cut, and thus also the separating layer 4, follows a wave-like profile. Valley regions 22a and peak regions 22b follow each other in the width direction and are shifted relative to each other 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.

[0200] Despite this approximation, thickness sections D1 and D2 remain, which are not completely penetrated (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 thickness sections D1 and D2.

[0201] Figure 14Figure 1 shows a schematic representation of a preferred method variant for separating the strips forming the thickness sections D1 and D2. In the example shown, two second cuts 40 are provided along the hatched planes. This separates the strips forming the thickness sections D1 and D2 and produces an intermediate product 42 with 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 extends over the entire thickness D of the intermediate product in every region between a maximum and a minimum, so that there are no areas where a gas could flow through the intermediate product 42 in the lateral direction B without being stopped by the (airtight) separating layer 4.

[0202] Figure 15Figure 1 shows a schematic representation of another preferred method variant in which the proportion of foam unusable for producing 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 introducing at least one third cut 44. If, as in the example shown, only a single third cut 44 is provided, the amount of unusable foam can be kept the same even with twice the amount of intermediate product 42 usable for producing sealing tapes. To ensure that every section of the intermediate product 42 is penetrated by the separating layer over its entire thickness, only two strips (namely the upper and lower thickness sections D1 and D2) are separated, so that, compared to the example shown, Figure 14In the variant shown, the amount of unusable foam is not increased. However, the usable portion of intermediate product 42 is doubled, since the third cut 44 adds two of the Figure 14 equivalent intermediate products 42 are produced.

[0203] Fig. 16 Figure 1 shows a sealing tape according to the state of the 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.

[0204] It can be seen that depressions can form in the end sections of this separating layer between the two foam bodies, which can promote the passage of air and thus impair the insulation effect.

[0205] Fig. 17 This shows in Fig. 16The sealing tape shown is installed between two building elements 130 and 140. As indicated by the arrows P, air can pass between building elements 130 and 140 and past the sealing tape.

[0206] Fig. 18 Figure 1 shows a representation of a preferred sealing tape. Here again, 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 in contact with the building components.

[0207] Reference numeral 108 identifies the further layer of an airtight material which is arranged here on the surface 112 and preferably covers it substantially completely.

[0208] On the second surface 114, an adhesive layer 118 is arranged, which serves to adhere the sealing tape 100 to a building structure. A further layer (not shown) made of an airtight material could also be arranged on this surface.

[0209] In particular, this additional layer 108 can cover the depressions that form at the boundary areas between the two foam bodies 102 and 104.

[0210] It should be noted that the individual figures also describe features which, considered individually, may be advantageous. The person skilled in the art will immediately recognize that a particular feature described in a figure can be advantageous even without incorporating further features from that figure. Furthermore, the person skilled in the art will recognize that advantages can also arise from a combination of several features shown in individual or different figures. However, it should be noted that the invention is defined exclusively by the accompanying claims. Reference symbol list

[0211] 1 Sealing tape 2 Foam carrier 4 Separating layer, barrier layer (film, sprayed / applied layer) 5 Cutting element 8 Adhesive strip 12, 14 Rollers or rolls 12a, 14a Projections 12b, 14b Recesses 13, 15 Waves of the rollers or rolls 16 Upper airtight material layer, top layer 18 Lower airtight material layer, top layer 22 First foam carrier part 22a, 24a Valley areas 22b, 24b Peak areas 24 Second foam carrier part 32 Interior side surface 34 Exterior side surface 36 Lower (first) surface of the foam carrier part 38 Upper (first) surface of the foam carrier part 40 Second cut 42 Intermediate product, bonded foam carrier parts with separating layer 44 Cut 100 Sealing tape (internal state of the art) 102 First foam body 104 Second foam body 106 Separating layer 108 Further layer 112 First surface 114 Second surface 118 Adhesive layer 130 Building element 140 Building element L Longitudinal direction B Width direction D Thickness direction D1, D2 Thickness sections D4 Thickness section over which the layer extends F Conveyor direction S Cuts for cutting off the rolls P1, P2, P3 Flows T1, T2 Tangents α1, α2 Angles I, II, II Areas

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) extends 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) is perpendicular to the longitudinal direction (L) and the width direction (B), - at least partially compressing the foam carrier in its thickness direction, wherein the degree of this compression varies across the width direction - cutting this foam carrier (2) in an at least partially compressed state of the foam into a first foam carrier part (22) and a second foam carrier part (24), wherein the cut extends at least in the longitudinal direction (L) and the width direction (B) - attaching 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 the two foam carrier parts (22, 24) together 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) is 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 in the width direction (B).

2. Method according to claim 1, characterized in that the separating layer is not arranged parallel to the width direction or only arranged parallel in sections, but is introduced curved at least in sections relative to the width direction and is preferably introduced in a wave-like manner in the width direction.

3. Method according to at least one of the preceding claims, characterized in that the foam is transported between two conveyor rollers (12, 14) and the distance between these two conveyor rollers (12, 14) varies.

4. Method according to at least one of claim 3, characterized in that a straight cutting tool is used and the foam is allowed to return to its original position after the cutting process.

5. Method according to at least one of claims 3-4, 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 in a further method step, the two foam carrier parts (22, 24) connected to each other are cut and, preferably, a further cut is made in a cutting plane extending in the thickness direction and in the longitudinal direction (L).

7. Method according to claim 6, characterized in that the further cut is made in an area of the foam carrier in which the separating layer (4) runs close to one of the two upper sides of the composite formed from the foam carrier parts (22, 24).

8. Method according to claim 6 or 7, characterized in that the separating layer (4) between the foam carrier parts (22, 24) is also cut during the further cut.

9. Method according to at least one of the preceding claims, characterized in that in an uncompressed state, n further third cuts are made in the composite of the joined foam carrier parts (22, 24), which run parallel to a first surface (36, 38), where n is at least 1 and the closest of these third cuts is at least HD / (n+1), where HD is the height of the foam carrier (2) in the thickness direction (D).

10. Foam tape (1) assembled as a sealing tape roll (10) with 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 foam carrier part, wherein the foam tape extends in a longitudinal 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) has an adhesive layer (8) on one surface and this surface extends in the length direction (L) and the width direction (B), wherein the separating layer (4) extends both in the longitudinal direction (L) and in the width direction (B) and in the thickness direction (D) and does not extend parallel to the width direction or only extends parallel to it in sections, but instead extends at least in sections in a curved manner relative to the width direction, wherein the separating layer runs in a wave-like manner in said width direction, wherein, in addition to the separating layer (4) and the adhesive layer (8), at least one further layer, namely a cover layer (18), is arranged on at least one foam carrier part (22, 24), and the separating layer (4) extends into the cover layer (18).

11. Foam tape according to claim 10, characterized in that the separating layer is arranged within the foam body in such a way that it forms a predetermined angle with the thickness direction, wherein this angle varies, preferably this angle varies across the width direction by at least 10°, further preferably by at least 20°, and in particular preferably by at least 30°.

12. Foam tape according to at least one of claims 10-11, characterized in that the area of greatest slope of the course of the separating layer relative to the width direction is arranged off-center, wherein preferably the area of greatest slope of the course of the separating layer relative to the width direction is shifted relative to the center of the sealing tape in the width direction toward the side surface of the sealing tape facing the interior of the room in the installed state.

13. Foam tape according to at least one of claims 10-12, characterized in that in addition to the separating layer (4) and the adhesive layer (8), a further layer, preferably a further cover layer (18), is arranged on at least one further foam carrier part (22, 24).

14. Foam tape according to claim 13, characterized in that the separating layer (4) extends into the further cover layer (18) or up to the further cover layer (18).

15. Foam tape according to at least one of claims 10-14, characterized in that the sealing tape is designed such that, when installed, the separating layer between the foam carrier parts essentially prevents air from passing through in the width direction of the sealing tape.