DE102020132214A1 - Sealing tape with two foam strips - Google Patents

Abstract

Sealing tape, in particular for sealing buildings, with a first foam strip (2) which extends in a longitudinal direction (L), in a width direction (B) perpendicular to the longitudinal direction (L) and in a direction that is perpendicular to the longitudinal direction (L) and the width direction (B ) vertical thickness direction (D), wherein an adhesive element (6) is arranged on at least one surface (22) of the first foam strip (2), which extends in the longitudinal direction (L) and the width direction (B), and on this adhesive element (6) a second foam strip (4) extending in the longitudinal (L), width (B) and thickness (D) directions with a surface extending in the longitudinal (L) and width (B) directions , is glued.

Description

The present invention relates to a sealing tape, in particular for sealing buildings. Such sealing tapes have long been known from the prior art. These usually have a foam element such as a foam strip, which is inserted, for example, in a joint between two parts of the building to be sealed. A problem with such foam strips is that steam, for example, can pass through them.

It is therefore known from the prior art, for example to attach a barrier layer to the surface of the foam, which prevents the passage of vapor or of liquids and gases. It is also known in the prior art that such a barrier layer is applied inside the foam body. However, these methods for producing such sealing tapes are relatively expensive.

The present invention is therefore based on the object of providing a sealing tape which is easier to produce than the prior art.

According to the invention, this is achieved by the subject matter of the independent patent claims. Advantageous embodiments and developments are the subject of the dependent claims.

A sealing tape according to the invention, in particular for sealing buildings, has a first foam element and/or a first foam strip which extends in a longitudinal direction, a width direction perpendicular to the longitudinal direction and a thickness direction perpendicular to the longitudinal direction and the width direction, with at least one surface of the first foam strip, which also extends in the longitudinal direction and the thickness direction, an adhesive element is arranged and on this adhesive element a second foam strip, which extends in the longitudinal direction, the width direction and the thickness direction, with a surface which extends in the longitudinal direction and extending in the thickness direction.

According to the invention, the first foam strip is an impregnated foam strip and the second foam strip is a non-impregnated foam strip and/or the first foam strip consists of an open-cell foam, while the second foam strip consists of a fine-cell and/or closed-cell foam.

While the applicant's internal prior art uses, for example, an airtight and mist-tight polymer film, it is now proposed to attach a further foam strip which is not impregnated and/or which consists of a fine-cell or closed-cell foam to the first impregnated foam strip. This second foam strip preferably fulfills the function of a barrier layer.

The extension of the second strip in the direction of thickness preferably corresponds to the extension of the first foam strip in the direction of thickness

In a preferred embodiment, the sealing tape described is made up as a roll, with the two foam strips being arranged next to one another, in particular in a longitudinal direction of this roll (i.e. the geometric direction along which the tape is wound into a roll).

In particular, the non-impregnated foam strip brings about strong restoring forces and improved closure, for example of a joint in which the sealing tape is arranged.

In a preferred embodiment, the first foam strip is made from an open-cell foam, or consists of an open-cell foam. The first foam is preferably a polyurethane foam or a foam that consists of polyurethane (PU) or is produced on a polyurethane basis.

In a further preferred embodiment, the second foam strip consists of a fine-cell and/or closed-cell foam. Or the second foam strip contains a fine-cell and/or closed-cell foam. In the context of this invention, fine-celled foam is to be understood to mean a foam which has a cell count/cm>25. A fine-cell foam used for a sealing tape as described above preferably has a cell number >35/cm, preferably >40/cm, particularly preferably >50/cm.

In a further preferred embodiment, the second foam strip consists of an airtight foam. This allows the second foam strip to act as a barrier. In the context of the present invention, an airtight foam is understood to mean that this has an air permeability of <200 l/(m ² s), preferably <120 l/(m ² s), more preferably <40 l/(m ² s) and particularly preferably <20 l/(m ² s) having. The above values refer to measurements of a test body 6 mm thick, a test area of 100 cm ² at a differential pressure of 2 mbar on a Frank device type 21443. A joint sealing tape can preferably be obtained in this way that meets the requirements of DIN 18542, stress group BG R and/or MF 1 and/or MF 2 corresponds.

This fine-cell/closed-cell and/or airtight foam, which is preferably also a polyurethane foam, is preferably designed as a barrier layer, in particular to ensure impermeability to driving rain. As an alternative to PU, the airtight foam could contain or consist of polyethylene (PE), polypropylene (PP), EPDM, PVC, neoprene or any other suitable polymer.

The first foam strip is preferably impregnated with an impregnate and in particular an acrylic impregnate. It is advantageously a flame-retardant impregnate and/or an impregnate that delays the recovery of the foam after compression.

A foam and in particular the first foam strip is particularly preferably produced without solvents, silicone and/or in particular not using (HCFC/CFC). In a particularly preferred embodiment, the sealing tape has an air permeability (measured according to DIN EN 12114) that is less than 0.1 m ³ /hm (daPA) ^2/3 . In a preferred embodiment, the sealing tape is impervious to driving rain of at least 600 Pa (determined according to DIN EN 1027).

In a further preferred embodiment, the second foam strip has a smaller width in the width direction than the first foam strip.

The width of the second foam strip in the width direction is preferably less than 80% of the width of the first foam strip, preferably less than 70%, preferably less than 60%, preferably less than 50%, preferably less than 40% and preferably less than 30%.

In particular, this is the sealing tape in a recovered state, i. H. in a state of being unrolled from the stock of, for example, a roll of sealing tape.

A width of the first foam strip is preferably between 10 mm and 200 mm. The first foam strip preferably has a width of ≧12 mm, preferably ≧15 mm, particularly preferably ≧20 mm and particularly preferably ≧30 mm. The width of the first foam strip is preferably ≦175 mm, preferably ≦150 mm, particularly preferably ≦125 mm and particularly preferably ≦100 mm.

A width of the second strip is preferably between 0.5 mm and 25 mm. The second foam strip preferably has a width of ≧1 mm, preferably ≧2 mm, particularly preferably ≧3 mm and particularly preferably ≧5 mm. The width of the second foam strip is preferably ≦20 mm, preferably ≦15 mm, particularly preferably ≦7.5 mm and particularly preferably ≦5 mm.

In a further preferred embodiment, the adhesive tape is a double-sided adhesive tape. However, it would also be conceivable to apply an adhesive layer.

The adhesive element preferably has the same dimensions as the first foam strip and/or the second foam strip.

The adhesive element preferably comprises an adhesive which is selected from a group which in particular, but not exclusively, contains silicones, PU, acrylates, rubber, hybrid sealants, PVAC, hot-melt adhesives, liquid adhesives and the like. Modifications of these materials could also be used. The adhesive element is preferably applied by a method selected from a group comprising liquid application, spraying, hotmelt application, extrusion and gluing on a self-adhesive film.

It would also be conceivable that the adhesive tape has smaller dimensions than the two foam carriers. It is pointed out here that said adhesive tape essentially fulfills the task of attaching or connecting the two foam strips to one another. It would also be possible for the adhesive element to be attached to the respective surface only at certain points or in strips. Since the tightness of the sealing tape required by the standards mentioned above is ensured by the second foam strip, it is not absolutely necessary for the adhesive element to also make a significant contribution to the tightness. Accordingly, the adhesive element can have openings through which steam could pass. The vapor diffusion resistance of the adhesive element is preferably at most 90%, preferably ≦80%, ≦75%, ≦60% or ≦50%, more preferably ≦25%, particularly preferably ≦10% of the vapor diffusion resistance of the second foam strip. In particular, if there are openings or channels in the adhesive element, its resistance to vapor diffusion can decrease due to the high mobility of the gaseous vapor can be extremely low and even almost equal to 0. It would also be possible for this adhesive tape to optionally also serve as an additional sealing layer.

In a further preferred embodiment, a second adhesive element is arranged at least on the first foam strip, this second adhesive element being arranged on a surface of the first foam strip which extends in the longitudinal direction and the thickness direction. In particular, this second adhesive tape is used to attach the sealing tape to a structure.

The sealing tape described here, in which the second foam strip makes a significant contribution to the tightness of the sealing tape, has significant advantages over a sealing tape with a polymer film arranged on the outside to improve the sealing properties. One of the main advantages is that the second non-impregnated foam strip has a supporting effect on the first foam strip due to its strong restoring forces when it rises. This in turn means that a joint is sealed better, since the non-impregnated foam can press more strongly against the joint flanks than, for example, compared to a polymer film or aluminum foil. Since such films themselves have no restoring force (in the direction of thickness) but rather, due to the adhesive mass with which they are bonded to the open-pored foam, even impede and at least delay the recovery of the compressed foam strip, the tightness of such sealing tapes cannot always be guaranteed.

In a preferred embodiment, the second foam strip has moisture variability. This can be achieved in particular by choosing moisture-variable materials as part of the foam. As a result, the water vapor diffusion resistance of the foam changes depending on the humidity of the environment surrounding the foam.

The water vapor diffusion resistance (usually abbreviated to "µ" or also referred to as the µ value) is characteristic of the water vapor diffusion resistance. The second foam strip preferably has a μ value of from 0.1 to 500, more preferably from 0.5 to 250 or from 2 to 50, measured according to DIN EN ISO 12572 at 25% relative atmospheric humidity (RH). Regardless of this or in combination with this, the second foam strip can have a µ value of 0.01 to 250 or 0.1 to 90 or 0.5 to 30 at 72.5% rel. Have LF, also measured according to DIN EN ISO 12572. For example, the µ-value at 25% rel. LF in the range from 5 to 30 m and at 72.5% rel. LF in the range of 0.5 to 15 m. Unless otherwise specified according to DIN EN ISO 12572, the µ-values refer to a temperature of 23°C.

The μ-value of the second foam strip at 25% on the one hand and at 72.5% relative humidity on the other hand (each at 23° C.) preferably differs by a factor of ≧1.1-1.2, preferably ≧1.5-2 , optionally up to a factor of 3 to 5 or up to 10 to 20 or also up to 50 or up to 100 or 150 or more, which defines the dependence of the water vapor diffusion of the second foam strip on the humidity. The difference between the two μ-values of the second foam strip at the two specified relative atmospheric humidities can be ≧2 or ≧4 or preferably ≧8-10 m, for example up to 5-15 or up to 20-25 or more. This results in a sufficient dependency of the water vapor diffusion resistance under different ambient conditions, for example in summer or winter or in different climate zones, in order to achieve sufficient adaptation of the water vapor diffusion resistance to the ambient conditions even with different relative humidity of the environment. The µ value at 25% rel. Air humidity is preferably the higher value compared to 72.5% air humidity.

The first foam strip is preferably formed from polyurethane and is preferably impregnated for delayed compression recovery. Its density is preferably between 20 and 200 kg/m ³ . The second foam strip can be made of the same or a different material (preferably PVC) and is particularly preferably not impregnated. However, its density is preferably also between 20 and 200 kg/m ³ . The density of the two foam strips preferably deviates from one another by a maximum of 70%, preferably by a maximum of 40%.

The first foam strip and the second foam strip preferably differ in at least one optically perceptible property. This could be a different color of the foam itself. In addition or as an alternative, a visual identification by printing an identification such as a pattern or lettering would also be conceivable and also represents a preferred embodiment on the outside of the room and can also be easily checked later.

The (first) foam of the first foam strip preferably has a compressive strength of more than 2 kPa. The compression hardness is preferably more than 2.1 kPa, more preferably more than 2.2 kPa, particularly preferably more than 2.3 kPa. The compression hardness is preferably less than 9 kPa, preferably less than 6 kPa and more preferably less than 4 kPa. The compression hardness is a measure of the strength of the foam. The values given here are based on a compression of 40% compared to the initial height. Compression hardness is determined according to DIN EN ISO 3386, CV40 is specified.

The (second) foam of the second foam strip preferably has a greater compressive strength than the foam of the first foam strip. The compression hardness of the second foam preferably exceeds that of the first foam by a factor of ≥ 1.2, preferably ≥ 1.3, ≥ 1.4 or ≥ 1.5, more preferably ≥ 2. The compression hardness of the second foam is preferably more than 2 kPa, but is preferably greater than 2.25 kPa, more preferably greater than 2.5 kPa, most preferably greater than 3.0 kPa. The compression deflection of the second foam is preferably less than 20 kPa, preferably less than 17 kPa and more preferably less than 14 kPa. The values given here are also related to a compression of 40% compared to the initial height, determined according to DIN EN ISO 3386 and specifying the CV40.

In a further preferred embodiment, the sealing strip has a third foam strip which is arranged in particular on the second foam strip in such a way that the second foam strip is arranged between the first and the third foam strip. In this embodiment, the second foam strip is sandwiched between the first and third foam strips. Preferably, the third foam strip is also thicker than the second foam strip. In this embodiment, the non-impregnated foam strip is introduced as a sandwich between two preferably impregnated foam strips.

The advantage of this configuration is also given here as above. In addition, such a sealing strip has the advantage that the installation direction is irrelevant here. The above-mentioned second adhesive element is preferably also arranged here at least on the third foam strip, so that it can be attached to a structure. The second adhesive tape preferably extends from the third foam strip over the second foam strip to the first foam strip, so that the entire surface of one side of the sealing tape (extending in the longitudinal and width directions) can be bonded to a structure.

The present invention is further directed to a method for manufacturing a sealing tape and in particular a sealing tape of the type described above. First of all, a first foam carrier is made available, which extends in a longitudinal direction, in a width direction and in a thickness direction. This foam carrier is transported in the longitudinal direction. In a further method step, a first adhesive element is attached to a surface of the first foam carrier which extends in the longitudinal direction and in the width direction.

Preferably, a second foam backing is attached to a surface of the first adhesive member that extends in the longitudinal direction and the width direction.

The second foam carrier preferably comprises a fine-cell, semi-closed and/or closed-cell foam, preferably PU, PE or PP. More preferably, the second foam carrier consists of such a fine-cell, semi-closed and/or closed-pore foam.

Preferably, both the first foam (the foam of the first foam backing) and the second foam (the foam of the second foam backing) are provided in roll form. A supply roll for such a foam includes the respective foam as a wound foam web. Such a foam web preferably has a length of between 3 m and 300 m, preferably between 10 m and 200 m, and a width of between 0.03 m and 3 m, preferably between 0.1 m and 1.5 m. The thickness of a foam sheet is preferably between 5 mm and 30 cm, more preferably between 1 cm and 20 cm. Preferably, the thickness of a first sheet of foam is significantly greater than that of the second sheet of foam (each in the uncompressed state). The thickness of the second foam sheet in the thickness direction is preferably less than 80% of the thickness of the first foam sheet, preferably less than 70%, preferably less than 60%, preferably less than 50%, preferably less than 40% and preferably less than 30%.

Optionally it is possible that on the opposite of the first foam carrier Side of the second foam carrier another third foam carrier is arranged. This is also preferably glued to the second foam carrier. The third foam carrier is preferably an open-pore foam. In principle, a foam that is identical or at least similar to the first foam could be used as the third foam. In such an embodiment, the second foam carrier is arranged between the first foam carrier and the third foam carrier and is preferably attached to these two foam carriers via an adhesive element.

At least one cut extending in the longitudinal direction is preferably made in the composite of the two foam carriers, which cut separates the composite into at least two composite strips. A large number of cuts extending in the longitudinal direction are preferably made in the composite.

A second adhesive element is preferably applied to each composite strip, in particular to a surface which extends in the longitudinal direction and in the thickness direction.

In a further preferred method, the individual composite strips are each rolled up to form a roll. It is preferred that the contact surfaces of the foam carrier with the first adhesive element each extend in the circumferential direction and in the radial direction. If a second adhesive element is provided, this extends in its main directions of extent in the circumferential direction and width direction of the roll (which is also the axial direction).

Optionally, it is also possible to produce a stack of several first and/or second foam carriers that are glued together. Such a stack can then be divided into a sealing tape as described above in a subsequent method step. In the simplest of these embodiments, the stack comprises three foam supports, namely two first and one second foam supports or a first and two second foam supports. Such a stack can be produced in a particularly simple manner in terms of the process by feeding one of the other first or second foam carriers on the top and bottom of a central first or second foam carrier and gluing it thereto.

If the central foam backing is then cut along its width direction (preferably in the middle) parallel to the first or second foam backing glued on the top and bottom, two of the composite foam backings described above are obtained, each of which (exactly) comprises a first foam backing and (exactly) a second foam backing . This can be done before or after (as described above) cutting the foam backing into foam strips (by making at least one cut perpendicular to the direction of the width of the foam backing).

The cutting preferably takes place after the composite of foam supports has been cut perpendicularly to the width direction of the foam supports and thus the formation of foam strips.

After the foam strip has been formed, the central first or second foam carrier can be cut particularly easily if the stack of sections of the first and second foam carrier has been rotated 90° beforehand and (preferably compressed) is wound up into a roll. In such a roll, the sections of the different foams are alternately arranged one after the other along the axial direction. Severing this roll by making a cut along the radial direction of the roll (also referred to as "cutting off") in the area of a single type of foam, preferably in the (central) area of the first foam (since this is usually wider than the second foam and thus the risk of damage to the adhesive bond due to inaccuracies when inserting the cut is lower) leads to a sealing tape in roll form as described above.

This method can also be carried out analogously with stacks of more than three foam carriers. Preferably, only the top and bottom foam carriers of this stack have a thickness that corresponds to the width of this foam in the sealing tape provided, although this is not absolutely necessary, but this foam can optionally be brought to the desired width in a later process step. The remaining foam carriers (or foam carrier sections) of this stack preferably have a thickness that corresponds to twice the width of this foam in the sealing tape provided. By severing these foam portions, each of which is twice as thick as the intended width (preferably by cutting off), these foam portions are brought to the extent that is also desired as their width in the sealing tape.

In a possible method step, it is therefore provided that the composite (or stack) consists of the at least three foam carriers and the adhesive element is rolled up onto a roll, in particular a large roll. Preferably, the composite has previously been cut into stacks by longitudinal cuts perpendicular to the width direction of the foam backing, each of which has a width which corresponds to the thickness of the desired sealing tape. After rotating this stack by 90° or 270°, a composite of several sealing tapes of the desired thickness is obtained, this composite however having a multiple of the width of the desired sealing tape. This composite can be wound up into a large roll for further processing, this preferably being done in such a way that the composite is wound around an axis in its longitudinal direction in such a way that the first and second foam carriers are arranged alternately one after the other along the axial direction. In a further process step, individual rolls are separated or cut off from this large roll.

The composite is preferably in compressed form on the large roll (in the thickness direction of the sealing strips).

Irrespective of whether the foam carriers are connected to form a foam carrier composite of two or more foam carriers, it is preferable for the foam carrier composite to first be cut into strips by making longitudinal cuts and perpendicular to the width direction of the foam carrier.

These strips preferably have a width which corresponds to the thickness of the intended sealing strips in the fully recovered state. These strips are preferably compressed along this direction and are preferably provided with a self-adhesive layer which extends along the longitudinal direction and perpendicular to the direction of compression and which is preferably suitable for adhering the sealing tape to a structural part.

Two process variants have proven particularly suitable for this purpose. In one of these variants, the strip is rotated through 90° (or 270°) and, after the self-adhesive layer has been applied, wound up around an axis to form a roll whose axis is aligned in the width direction of the foam backing while it is being bonded to one another. In such a roll, the main directions of extension of the self-adhesive layer follow along the axial direction and the circumferential direction. Thus, the self-adhesive layer is essentially perpendicular to the interface between the first and second foam sections within a turn.

Instead of rotating the strip by 90° as described above, the second preferred variant provides for the strip to be wound up around an axis to form a roll, the axis of which is aligned in the direction of the thickness of the foam carrier while they are being bonded to one another. For this purpose, an individual strip from the multiplicity of parallel composite strips produced by cutting the composite of the foam supports is removed in the width direction with respect to the foam supports and wound up to form a roll. Compression is done with respect to the strip as described above. Likewise the bonding with the self-adhesive layer. Due to the fact that the foam is not rotated by 90° in this variant, the corresponding parts of the plant are oriented rotated by 90° compared to the method variant described above.

Alternatively, it would also be conceivable, in a further method step, to wind up the composite of foam carriers, which have not yet been separated, about an axis extending in the direction of their width to form a large roll. Individual rolls are then separated or cut off from such a large roll. The foam on these rolls is preferably not compressed, so that a side surface of such a roll can be coated with a second adhesive element. This second adhesive element can be used to fix the sealing tape to a building. For better handling of such a sealing tape, the previously described roll is preferably unwound, the sealing tape is rotated and then made up again into a roll in the compressed state. The foam is preferably compressed in the direction of the second adhesive element. The rotation preferably takes place by 90° or 270° with respect to the longitudinal axis of the sealing tape, such that the second adhesive element contacts the previous winding of the sealing tape on the roll, i.e. the winding of the sealing tape adjacent in the direction of the core of the roll, when it is wound up again. The sealing tape is made up as a roll, preferably with foam compressed in the direction of the core of the roll.

In a further preferred method, the first foam carrier is impregnated. In particular, it is preferred that the impregnation takes place before the adhesive bonding to the second foam carrier.

The adhesive element is also preferably designed as an adhesive tape, which is unrolled from a roll, for example.

In a further process step, after the second foam carrier has been attached to the first foam carrier, this composite is pressed together in at least one direction. To this end, pressure is preferably applied in the thickness direction, ie at for example from the direction of the second foam carrier in the direction of the first foam carrier. Such an application of pressure can support the adhesion of the foam strips to the adhesive element and thus also to one another via this.

In particular, however, it is preferable that pressure is applied along the width direction. Such pressurization compresses both the second foam backing and the first foam backing to approximately the same extent. The sealing tape thus obtained is preferably made up in the compressed state as a roll. After such a sealing tape has been unrolled from the roll, the foams recover, with parts of the second (closed-pore and/or fine-cell) foam backing accelerating the recovery of the first foam backing due to its stronger restoring force compared to the foam of the first foam backing. This can be due to the first foam being pulled along by the second (fine-cell and/or closed-pore) foam via the adhesive connection.

• Darin zeigen:
  • 1 eine Anordnung eines erfindungsgemäßen Dichtbands in einer Bauwerksfuge;
  • 2 eine Darstellung einer weiteren Ausgestaltung eines erfindungsgemäßen Dichtbands in einer Bauwerksfuge;
  • 3 schematische Darstellung eines Verfahrens zur Herstellung eines Dichtbands.

Further advantages and embodiments result from the attached symbol:

• Show in it:
  • 1 an arrangement of a sealing tape according to the invention in a building joint;
  • 2 a representation of a further embodiment of a sealing tape according to the invention in a building joint;
  • 3 schematic representation of a method for producing a sealing tape.

1 shows a representation of a sealing strip 1, which is arranged between two structures 12 and 14. This sealing tape 1 has a first foam strip 2 and a second foam strip 4. As mentioned above, the first foam strip 2 is an impregnated and open-cell foam. In contrast to this, the second foam strip 4 is not impregnated and is particularly preferably made of a fine-cell and/or closed-cell foam. Reference A refers to an outside of a building and reference I to an inside of the building.

Reference number 6 denotes an adhesive element with which the two foam strips 2 and 4 are attached to one another. The second foam strip 4 brings about, in particular as mentioned above, impermeability to driving rain. The reference character B refers to a width direction of the sealing strip, the reference character L, which here runs perpendicular to the plane of the figure, to a longitudinal direction, and the reference character D to a thickness direction. It can be seen that the first foam strip has a significantly greater extent in the width direction than the second foam strip 4.

2 shows a further embodiment of a sealing strip 1 according to the invention. In addition to the already in 1 In addition to the first and second foam strips described, a third foam strip 8 is provided here, with the second foam strip 4 being sandwiched between this third foam strip 8 and the first foam strip 2 . Correspondingly, two adhesive tapes 6 are also provided here, which glue the total of three foam strips 2, 4 and 8 to one another. The reference numerals 12 and 14 in turn relate to parts of the building.

In 3 a possible variant of the method for producing a sealing tape as described above is shown schematically. To produce such a sealing tape, a first foam carrier 3 is first provided, which extends in a longitudinal direction (L), a width direction (B) and a thickness direction (D). This foam carrier 3 could be provided in the form of a roll, for example, and unwound from the roll for further processing. For this purpose, it is guided in the transport direction T. During this transport, a surface 22 of the first foam substrate 3, which extends in the longitudinal direction (L) and width direction (B), is provided with an adhesive element (not shown), for example a liquid adhesive is sprayed on. The adhesive element serves to connect a surface 24 of a second foam carrier 5, which also extends in the longitudinal direction (L) and width direction (B), to the surface 22 of the first foam carrier 3. Again 3 can be seen, it is preferred that the second foam carrier 5 compared to the first foam carrier 3 has a much smaller extent in the direction of thickness. By connecting the first foam backing 3 to the second foam backing 5 by means of the adhesive element, a composite 15 of two foam backings is created in the example shown.

During transport of the composite 15 along the transport direction (T), cuts 16 are made in the composite by cutting elements (not shown), as a result of which a multiplicity of composite strips 17a, 17b, 17c . . . is formed. These are rotated by 90° about their longitudinal axis in the rotation area 18 (during transport). This changes the orientation of the main first stretching axes of the foam sections. After the rotation of the composite strips, the second foam strip 4 extends essentially in the direction of the longitudinal direction (L) and the direction of thickness (D). The extension of the second foam strip 4 along the width direction (B) corresponds (after rotation) to the extension of the second foam carrier 5 in the thickness direction (D).

Furthermore shows 3 that then a second adhesive element 20, in this case a self-adhesive, is applied to one side of the composite strip. This self-adhesive extends perpendicularly to the adhesive element 6 (not shown), which connects the foam carriers 3 and 5 or the first foam strip 2 and the second foam strip 4 to one another. The sealing tape 1 thus obtained is then wound up into a sealing tape roll 26. Unlike in FIG 3 shown, the winding is preferably carried out by bending the sealing tape 1 in the direction of the second adhesive element 20. This has the advantage that the sealing tape can be fixed directly to a roll core with the second adhesive element 20 and the roll is also easy to handle, since the Outside of the roll is formed by the (non-adhesive) foam and not by the self-adhesive.

The applicant reserves the right to claim all features disclosed in the application documents as essential to the invention, provided they are new compared to the prior art, either individually or in combination. It is also pointed out that the individual figures also describe features which can be advantageous in and of themselves. The person skilled in the art recognizes immediately that a specific feature described in a figure can also be advantageous without adopting further features from this figure. Furthermore, the person skilled in the art recognizes that advantages can also result from a combination of several features shown in individual figures or in different figures.

Reference List

1

sealing tape

2

first foam strip

3

first foam carrier

4

second foam strip

5

second foam carrier

6

adhesive element

8th

third foam strip

12, 14

structural parts

15

Composite of foam carriers

16

cut

17, 17a, 17b, 17c

compound strips

18

turning range

20

second adhesive element/self-adhesive

22

Surface of the first foam strip/backing

23

Surface of the first foam strip/backing

24

Surface of the second foam strip/backing

26

sealing tape roll

A

exterior of a building

I

inside of a building

L

longitudinal direction

B

latitude direction

D

thickness direction

Claims (10)

Sealing tape, in particular for sealing buildings, with a first foam strip (2) which extends in a longitudinal direction (L), in a width direction (B) perpendicular to the longitudinal direction (L) and in a direction that is perpendicular to the longitudinal direction (L) and the width direction (B ) vertical thickness direction (D), wherein an adhesive element (6) is arranged on at least one surface (22) of the first foam strip (2), which extends in the longitudinal direction (L) and the thickness direction (D), and on this adhesive element (6) a second foam strip (4) extending in the longitudinal direction (L), the width direction (B) and the thickness direction (D) with a surface (24) which extends in the longitudinal direction (L) and the thickness direction ( D) extends, is glued, characterized in that the first foam strip (2) is an impregnated foam strip and the second foam strip (4) is a non-impregnated foam strip. sealing tape after claim 1 , characterized in that the first foam strip consists of an open-cell foam. Sealing tape according to at least one of the preceding claims, characterized in that the second foam strip (4) consists of a fine-cell and/or closed-cell foam. Sealing tape according to at least one of the preceding claims, characterized in that the second foam strip (4) consists of an airtight foam. Sealing tape according to at least one of the preceding claims, characterized in that the second foam strip (4) has a smaller width in the width direction than the first foam strip (2). Sealing tape according to the preceding claim, characterized in that the width of the second foam strip (4) in the width direction (B) is less than 80% of the width of the first foam strip (2), preferably less than 70%, preferably less than 60% preferably less than 50%, preferably less than 40% and preferably less than 30%. Sealing tape according to at least one of the preceding claims, characterized in that the adhesive element (6) is an adhesive tape and in particular double-sided adhesive tape. Sealing tape according to at least one of the preceding claims, characterized in that a second adhesive element (20) is arranged on the first foam strip, this second adhesive element being arranged on a surface (23) of the first foam strip which extends in the longitudinal direction and the width direction ( B) extends. Sealing tape according to at least one of the preceding claims, characterized in that the sealing tape has a third foam strip which is arranged on the second foam strip (4) in such a way that the second foam strip (4) is arranged between the first and the third foam strip (8). is. Method for manufacturing a sealing tape with the steps: - Providing a first foam carrier (3) which extends in a longitudinal direction (L), a width direction (B) and a thickness direction (D) and transporting this first foam carrier (3) in the longitudinal direction (L, T), - attaching an adhesive element (6) to a surface of the first foam carrier (22) which extends in the longitudinal direction (L) and the width direction (B), - attaching a second foam support (5) to a surface of the adhesive element (6) which extends in the longitudinal direction (L) and the width direction (B).

Images