EP2333178B1 - Precompressed sealing tape - Google Patents

Description

The invention relates to a precompressed sealing tape for sealing a joint, for example between a frame profile of a window or a door and a building wall.

Out EP 1 131 525 B1 For example, a pre-compressed sealing tape is known, which consists of a resiliently elastic foam strip of rectangular cross-section, which is completely enclosed in the compressed state by a sheath which is formed by a plastic film. The plastic film forms a running in the longitudinal direction of the sealing strip tear tab by the plastic film is arrested to form a Hissißstelle against itself. To fix the foam strip within the pocket formed in this way, it is glued on its underside with the wrapper, and the wrapper is in turn on its underside with separate adhesives, such as a double-sided adhesive tape, attachable to a frame profile.

A similar precompressed sealing tape is off EP 1 959 065 A1 known in which the envelope covers the bottom only in a first and a second edge region. The adhesive tape adheres both to the two edge strips as well as in a central region of the underside of the foam strip directly to the foam strip.

Sealing tapes of this type are adhered to the frame profile to be sealed, and after installation of the frame profile in a building wall opening the enclosure is torn open to allow the foam strip to resiliently reset and thus seal the frame profile on the building wall. In these known sealing tapes, however, it is disadvantageous that they can only be produced in relatively small widths, since otherwise due to the restoring force of the precompressed sealing tape, an oval to round shape results within the envelope, which is unsuitable for installation. However, in the context of ever-increasing requirements for waterproofing in buildings, it is desirable to provide precompressed sealing tapes in any widths to achieve higher sealing values, better thermal insulation and better soundproofing.

US 2008/0134595 A1 describes a sealing strip of foam, which is provided on an upper side with an adhesive strip and on a bottom, which is opposite to the top, with a rigid layer of plastic.

WO 98/45565 A describes a sealing strip of foam, which is surrounded by a sheath. In the envelope, a rigid layer of cardboard or plastic may be provided. After opening the foil-like wrapping the foam strip expands a little in the sealed joint in which he is loosely inserted.

These embodiments have the disadvantage that the rigid layer remaining in the joint does not meet the high demands on thermal insulation and high sealing values, and thus the entire sealing element is unsuitable for long-term use.

In US 4,204,373 a sealing tape is described, which consists of a flat bar for adhering to a frame profile and a foam strip arranged thereon. The foam strip is covered by a sheet of paper or plastic, which is glued to the flat bar and keeps the foam strip in the compressed state. In the edge strip of the cover run tear-open, with the help of which the film can be torn open after installation of the provided with the sealing strip frame profile in the building.

The problem with this embodiment is in particular the large space requirement of the sealing tape on both sides,

The invention has for its object to provide a precompressed sealing strip which is simple and easy to handle, which can be supplied in any widths and can be applied and transported easier.

This object is solved by the features of claim 1.

The sealing tape according to the invention has an elastically resilient, in the longitudinal direction further than transversely extending foam strip having two side surfaces and two lateral surfaces connecting these transverse surfaces, also a film-like envelope which surrounds the foam strip at least partially and in the pre-compressed state, and a strip-shaped Element which has a greater bending strength in the transverse direction than the foam strip, wherein the strip-shaped element is arranged in the region of a first transverse surface of the foam strip. In this case, a first portion of the film-like envelope between the first transverse surface of the foam strip and the strip-shaped element is arranged, and a fastening means is arranged in the region of the strelfenförmigen element.

This ensures that the compressed rectangular shape of the foam strip is maintained even with large widths of the sealing strip, while the space requirement of the sealing strip is minimal before its use in all directions. In addition, the sealing tape according to the invention can be pre-assembled so already on the frame member to be sealed, and on the site only after the insertion of the frame member in the building opening the expansion of the foam strip by opening the enclosure be enabled.

In a preferred embodiment, the first transverse surface of the foam strip is fixedly connected to the strip-shaped element. This creates a secure connection between the two layers and prevents slippage of the layers against each other.

Preferably, the fastening means is provided in the region of the side of the strip-shaped element, which faces away from the first transverse side of the foam strip, a fastening means for fastening the strip-shaped element to the component.

A particularly simple attachment of the sealing tape to the component is achieved if the fastening means is designed as a double-sided adhesive strip, which in turn may be covered by a cover film prior to attachment,

In one embodiment, the first portion of the envelope between the first transverse surface of the foam strip and the strip-shaped element may be formed continuously along the first transverse surfaces.

In another embodiment, the first portion of the sheath may be disposed in a first portion of the first transverse surface of the foam strip between the first transverse surface and the strip-shaped element. Thus, a simple connection between foam strip and strip-shaped element is possible because the majority of the first transverse surface of the foam strip is available as a mounting surface. In this case, precompression of the sealing tape is achieved by arranging a second section of the covering in a second subregion of the first transverse surface of the foam strip, which is opposite the first subregion, between the first transverse surface and the strip-shaped element.

Improved sealing properties are provided by the sealing tape when the strip-shaped element is formed from foam and has a higher flexural strength than the foam strip.

Advantageously, the strip-shaped element has a flexural strength of more than 200 kPa, preferably more than 250 kPa, on. In a further preferred embodiment, the strip-shaped element has a bending strength of more than 300 kPa, preferably more than 400 kPa. In a particularly preferred embodiment, the strip-shaped element has a flexural strength of more than 500 kPa, preferably more than 1,000 kPa, and more preferably more than 2,000 kPa. In this way, a deformation of the sealing tape is effectively minimized even at large widths.

Preferably, the wrapper has a longitudinally extending tear tab which serves as a tension member for opening the wrapper. Thus, after the pre-assembly of the sealing tape on a frame member to be sealed, the envelope can be opened in a simple manner by the user.

It can be advantageous in each case for the sheath to be provided with at least one predetermined breaking point, preferably a perforation line, extending in the longitudinal direction of the sealing strip, whereby the opening of the sheath is simplified.

In one embodiment, the sealing tape can be wound into a roll, which considerably simplifies the transport and storage of the sealing strip.

If a component is already equipped with the sealing tape according to the invention attached thereto, the insertion of the component on the construction site is particularly simple and straightforward. In addition, the component is additionally protected during transport.

Fig. 1

ist eine Querschnittsansicht einer Ausführungsform des erfindungsgemäßen vorkomprimierten Dichtbands zum Abdichten einer Fuge;

Fig. 2

ist eine Querschnittsansicht einer weiteren Ausführungsform des erfindungsgemäßen vorkomprimierten Dichtbands zum Abdichten einer Fuge, befestigt an einem Bauteil;

Fig. 3

ist eine Querschnittsansicht einer weiteren Ausführungsform des erfindungsgemäßen vorkomprimierten Dichtbands zum Abdichten einer Fuge; und

Fig. 4

ist eine Querschnittsansicht einer weiteren Ausführungsform des erfindungsgemäßen vorkomprimierten Dichtbands zum Abdichten einer Fuge, befestigt an einem Bauteil.

The invention will be explained in more detail with reference to embodiments shown in the drawings.

Fig. 1

Figure 11 is a cross-sectional view of one embodiment of the pre-compressed sealing tape of the invention for sealing a joint;

Fig. 2

is a cross-sectional view of another embodiment of the precompressed sealing tape according to the invention for sealing a joint, attached to a component;

Fig. 3

Figure 11 is a cross-sectional view of another embodiment of the pre-compressed sealing tape of the invention for sealing a joint; and

Fig. 4

is a cross-sectional view of another embodiment of the precompressed sealing tape according to the invention for sealing a joint, attached to a component.

In the drawings, foam strips, sheaths, adhesive tapes, strip-shaped elements and cover sheets are partially shown at a certain distance from each other to clearly distinguish the individual elements that make up the sealing strip. In reality, these elements are closely related.

In Fig. 1 to 4 a foam strip 2 is shown, which in the illustrated example has a rectangular cross-section, is partially surrounded by a film-like envelope 4 and is held in a pre-compressed state. The foam strip 2 may be formed of any open cell or closed cell flexible foam, eg polyurethane or polyethylene, and may be impregnated for a delayed recovery. A multilayer arrangement of a plurality of different foam materials laminated on one another is just as conceivable as the arrangement of an impregnated foam layer on or next to an unimpregnated foam layer. In particular, in the transverse direction of the sealing tape, different foam layers can be arranged adjacent to each other, for example to ensure different air permeabilities of the sealing tape in the interior and exterior or a vapor diffusion gradient. The foam strip 2 extends in its longitudinal direction further than in its transverse direction and has two side surfaces 6 and two transverse surfaces 8, 9 (top 8 and bottom 9), which connect the two side surfaces 6.

The material of the envelope 4 may be a sheet material, a mesh fabric, paper or other material which is suitable for the stated purpose. In addition, laminated films composed of a plastic film laminated with a base material (eg, nonwoven fabric) or fabric-reinforced films may also be used. All these materials are circumscribed with the term "film-like". Combinations of these materials are possible. However, preference is given to a thermoplastic film or a shrink film which contracts under the influence of heat. This last-mentioned effect can also be applied only in parts of the envelope 4 in order to make them taut and wrinkle-free, for example in the area of the upper side 8 of the foam strip 2. It is also possible that the envelope 4 only in the region of the top 8 of the foam strip 2 has a gain.

In the region of at least one transverse surface, in the present example, the bottom 9 of the foam strip 2, a strip-shaped element 10 is arranged, which has a certain bending strength in the transverse direction. The bending strength should be so high that the strip-shaped element 10 absorbs the force which would result from the expansion tendency of the foam strip 2 and would normally lead to deformation of the flexible cover 4 towards an oval or even round tube, without the strip-shaped Element 10 itself is deformed too much.

As a material of the strip-shaped element 10, a foam is preferably provided, which has a higher, preferably significantly higher flexural strength than the foam strip 2. Further details will follow below. In addition, for example, cardboard is an option, but all other possible rigid materials, e.g. hard plastics, usable.

In certain embodiments, the strip-shaped element 10 should be bendable in the longitudinal direction such that the sealing strip can still be wound up into a roll.

In the illustrated example cases, a tear tab 22 is provided, which is formed by two adjoining sections of the enclosure 4. It is also possible to provide only a flag-like extension of the enclosure 4. By pulling on the tear tab, the film-like wrapping 4 is opened and the expansion of the foam strip 2 is made possible. For this purpose, at least one predetermined breaking point 14, preferably a perforation line, may be provided in the wrapping 4 in the region of the side surface 6 on which the tear tab 22 protrudes. The positions of the predetermined breaking points 14 shown in the figures are preferred because in this case no or only little material remains on the left side surface 6 after opening the sheath 4 and a large part of the sheath 4 slides along the expanding foam strip 2 and over its right Side surface 6 arranges. This can be used, for example, if the envelope 4 has special sealing properties which serve for the special sealing of the right side face 6, for example in the sense of a vapor diffusion barrier. However, a number of other positions of the predetermined breaking points 14 in the invention is conceivable.

The wrapping 4 can also be reinforced in the region adjacent to the predetermined breaking point 14, for example by thermal scumming of the film or additional application of an adhesive strip or thermal lamination of a film strip. This creates a tear limitation in the event that the enclosure 4 ruptures when cutting the desired tear 14 next to the predetermined breaking point 14 and continue to tear uncontrollably.

Likewise, it is possible to tear open the wrapper 4 by pulling on the tear tab 22 even without the break point 14 when the wrapper 4 does not resist large tensile forces, rupture the wrapper 4 over a tear thread or cut open the wrapper with a knife or open it with another tool , Finally, the entire enclosure can be removed if the attachment of the envelope on the foam strip 2 or on the strip-shaped element 10 can be released by train.

The tear tab 22 can as shown on the outside (in the figures left), for reasons of better accessibility after assembly of the component 12 (eg when used in a facade or exterior wall) but also on the inside (in the figures right) may be arranged , Likewise, two tear tabs 22 may be provided on the inside and the outside for alternative opening of the enclosure 4 from inside or outside.

A double-sided adhesive tape 16 is arranged in the illustrated example between the one transverse surface of the foam strip 2, here the bottom 9, and the strip-shaped element 10 and connects the two elements firmly together. The firm connection between foam strip 2 and strip-shaped element 10 can also be effected by other means, for example via thermoplastic lamination.

A fastener 18, the attachment of the sealing tape to a component to be installed 12 (see Fig. 2 and 4 ), such as a frame profile of a window, is arranged in the region of the strip-shaped element 10. In the in Fig. 1 to 3 illustrated embodiments, the fastening means 18 is formed as an adhesive strip, according to bottom facing outside is preferably covered by a peelable cover sheet 20, such as a silicone paper or the like, as long as the sealing tape is not attached to the component 12.

It should be emphasized at this point that in practice the adhesive strip is very often realized by an adhesive layer which adheres to a silicone paper or the like and which has been laminated in this form on the strip-shaped element 10. Occasionally, a mesh fabric or a carrier film, non-woven or the like may be embedded in this adhesive layer to increase the tensile strength. The term "adhesive strip" used above should therefore also include adhesive layers of this type described here. The same applies to the term "adhesive tape".

A first portion 24 of the film-like wrapping 4 is always arranged between the first transverse surface 9 of the foam strip 2 and the strip-shaped element 10.

The cladding covers in the example of Fig. 1, 2 and 4 the two side surfaces 6 and the top 8 of the foam strip 2 from. In the region of the underside 9 of the foam strip 2, in each case a first section 24 of the covering 4 is arranged over a partial area of the underside 9 of the foam strip 2. In addition, a second portion 26 of the casing 4 in a second portion of the first transverse surface, here underside 9 of the foam strip 2, which is opposite to the first portion, between the first transverse surface 9 and the strip-shaped element 10 is arranged. The two sections 24 and 26 of the envelope 4 thus comprise the two lower edges of the foam strip 2, are folded inwards and fastened there to the foam strip 2, preferably glued or laminated or welded to the foam strip 2. Between the two sections 24, 26 of the sheath 4, the bottom 9 of the foam strip 2 remains uncovered by the sheath 4. There is in Fig. 1 attached the double-sided tape 16. The adhesive tape 16 can also, as in Fig. 2 and 4 shown extending over the two sections 24, 26 of the enclosure 4.

The sealing tape according to the invention can in principle be produced both in strip form and as a roll. In particularly rigid materials of the strip-shaped element 10, the strip shape remains as a single option.

In Fig. 2 and 4 a component 12 is shown with attached sealing tape. In such a Configuration, the component 12 can be delivered as a finished kit to the site. The connection between the sealing strip and component 12 is produced by the fastening means 18. In Fig. 2 this attachment means 18 is the adhesive strip, from which the covering film 20 was previously removed. In Fig. 4 the attachment means 18 is a Keder- or plug-in profile, which ensures a secure connection and is preferably connected by lateral sliding or snapping with the component.

The sealing tape is usually fastened by means of the fastening means 18 prior to installation or even before the transport of the sealed frame member 12 thereto. After installation in the appropriate building opening on site then only the sheath 4 must be opened by a knife or by pulling on the tear tab 22. The attached to the frame member 12 strip-shaped element 10 (which is usually not expandable) remains unchanged, while the foam strip 2 expands upwards and ensures the sealing of the joint. In the process, the part of the covering 4 remaining in the joint slides along the expanding foam strip 2 and finally, in the final state, preferably covers at least a portion of its right side surface 6.

In the embodiment of the Fig. 3 The first portion 24 of the enclosure 4 is continuous between the foam strip 2 and the strip-shaped element 10. In this case, the attachment of the first portion 24 at the bottom 9 of the foam strip 2 via the double-sided adhesive tape 16, while another double-sided adhesive tape 27, the connection between the first section 24 of the enclosure 4 and the strip-shaped element 10 produces. Instead of the adhesive tapes 16, 24, the wrapper 4 may also be glued, welded or laminated to the foam strip 2 or the strip-shaped element 10 in another manner. As in the other embodiments, the envelope 4 prevents the expansion of the foam strip 2 and keeps it in the pre-compressed state.

Many other embodiments of the present invention are conceivable. The referring to Fig. 1 to 4 Details shown can also be used in the other embodiments. Likewise, other designs are conceivable, as long as at least a portion of the envelope 4 between the strip-shaped element 10 and the foam strip 2 is arranged.

In practice, the foam strips 2 are usually precompressed so that they can expand when relaxing preferably to about five to ten times their occupied in the pre-compressed state thickness, but often only about half is used to secure attachment to the building part to ensure, which is opposite to the profile element to be sealed.

As the material of the strip-shaped element 10, a foam is preferably provided which has a higher flexural strength than the foam strip 2, usually a significantly higher bending strength. The strip-shaped element has a bending strength of more than 200 kPa, preferably more than 250 kPa. In a preferred embodiment, the strip-shaped element has a flexural strength of more than 300 kPa, preferably more than 400 kPa. In a particularly preferred embodiment, the strip-shaped element has a flexural strength of more than 500 kPa, preferably more than 1,000 kPa, and more preferably more than 2,000 kPa. In this way, a deformation of the sealing tape is effectively minimized even at large widths.

The material of the foam strip 2, on the other hand, has a flexural strength of less than 150 kPa, preferably less than 125 kPa, more preferably less than 100 kPa.

The bending strength of the material of the strip-shaped element 10 and the foam strip 2 is determined in accordance with the standard ISO 1209-2, third edition from the year 2007. This international standard is commonly used to measure the flexural strength of plastics, but in a slightly modified form is also excellent for measuring the flexural strength of foams.

In this case, a uniformly changed force is applied in the middle between two supports perpendicular to a sample and thus bent through. The flexural strength is calculated from the measured force / deformation curve (see Chapter 3 of ISO 1209-2). The test device is in Chapter 4, Fig. 1 shown in more detail. An example of the test equipment used is the type BZ2.5 / TN1S from Zwick of Ulm, Germany. For example, the type KAP-Z for forces up to 200 N is used as a load cell.

The pads consist of two parallel cylindrical support elements arranged in the same horizontal plane, each of which has a radius of (15 +/- 1) mm. The length of the support elements is greater than the width of the samples and is in the present case 80 mm.

The distance L between the support elements differs from the ISO 1209-2 in the present measurement and is set to (85 +/- 2) mm. The power transmission element has the same shape as the support elements. The other sizes specified in chapter 5.1 of ISO 1209-2 are also changed for the special purpose of measuring foams. Each measured foam sample is a cuboid with length l = (150 +/- 3) mm, width b = (40 +/- 2) mm and thickness d = (3.0 +/- 0.2) mm. Of the under chapter 6 of the test conditions described in ISO 1209-2, the first one is used, ie a measurement at (23 +/- 2) ° C and (50 +/- 10)% relative humidity. Contrary to the velocity value of the movement of the force transmission element specified in Chapter 7 of ISO 1209-2, this is only moved downwards by (10 +/- 1) mm per minute. In addition, the force is measured up to a maximum bending of the foam of 20 mm and recorded during the measurement occurred maximum value F _{R of} the force. The calculation of the bending strength R (in kPa) according to chapter 8.1 of ISO 1209-2 thus results from the formula R = 1.5 F _R * L / bd ² * 106, where F _{R is} the maximum applied force in kN, L the distance between the support elements in mm, b the width of the sample in mm and d the thickness of the sample in mm.

In the case of the previously specified values for L, b and d, the above-mentioned values result from the measured force F _R for the material of the strip-shaped element 10 and the foam strip 2.

The in the Fig. 1 to 4 illustrated embodiments are shown in a more idealized shape of the cross section of the foam strip 2. In fact, namely, the upper transverse surface 8 of the foam strip 2 is at least slightly expanded in the direction of a dome shape by the pressure acting from the inside, so that the cross-section of the foam strip 2 in the pre-compressed state assumes a certain extent, though not too different, shape from the rectangle , A certain transverse deflection (outer curvature) of the rigid element 10 can also be observed in practice, especially with large widths of the sealing strip.

The invention has been described above using the example of a foam strip 1 with a rectangular cross-section, because this greatly facilitates the explanation of the invention and its features. The term "rectangular" should also include "square". However, the person skilled in the art recognizes that the invention can also be implemented in a corresponding manner with foam strips 2 which have cross sections which deviate from the rectangle. The specified cross-sectional shape of the foam strip 2 should therefore not be understood as limiting.

Claims (14)

1. Pre-compressed sealing tape for sealing a joint, comprising:

   a resiliently flexible foam strip (2), extending further in a longitudinal direction than in a transverse direction, which comprises two lateral surfaces (6) and two transverse surfaces (8, 9) which connect the two lateral surfaces (6);

   a sheet-type wrapping (4), which surrounds the foam strip (2) at least in part, prevents the expansion of the foam strip (2) and keeps the foam strip (2) in the pre-compressed state; and

   a strip-shaped element (10), which has a greater flexural strength in the transverse direction than the foam strip (2), the strip-shaped element (10) being arranged in the region of a first transverse surface (9) of the foam strip (2);

   characterised in that
   a first portion (24) of the sheet-type wrapping (4) is arranged between the first transverse surface (9) of the foam strip (2) and the strip-shaped element (10), and in that a fastening means (18) which attaches the sealing tape to a component (12) is arranged in the region of the strip-shaped element (10).
2. Pre-compressed sealing tape according to claim 1, characterised in that the first transverse surface (9) of the foam strip (2) is rigidly connected to the strip-shaped element (10).
3. Pre-compressed sealing tape according to either claim 1 or claim 2, characterised in that the fastening means (18) for fastening the strip-shaped element (10) to the component (12) is provided in the region of the side of the strip-shaped element (10) which faces away from the first transverse side (9) of the foam strip (2).
4. Pre-compressed sealing tape according to claim 3, characterised in that the fastening means (18) is formed as a double-sided adhesive strip.
5. Pre-compressed sealing tape according to any of the preceding claims, characterised in that the first portion (24) of the wrapping (4) is formed between the first transverse surface (9) of the foam strip (2) and the strip-shaped element (10) all the way across the first transverse surface (9).
6. Pre-compressed sealing tape according to any of claims 1 to 4, characterised in that the first portion (24) of the wrapping (4) is arranged in a first partial region of the first transverse surface (9) of the foam strip (2) between the first transverse surface (9) and the strip-shaped element (10), and in that a second portion (26) of the wrapping (4) is arranged in a second partial region of the first transverse surface (9) of the foam strip (2), which region is opposite the first partial region, between the first transverse surface (9) and the strip-shaped element (10).
7. Pre-compressed sealing tape according to any of the preceding claims, characterised in that the strip-shaped element (10) is made of foam and has a greater flexural strength than the foam strip (2).
8. Pre-compressed sealing tape according to claim 7, characterised in that the strip-shaped element (10) has a flexural strength of greater than 200 kPa, preferably greater than 250 kPa, the flexural strength being determined on the basis of the standard ISO 1209-2, third edition, from the year 2007.
9. Pre-compressed sealing tape according to claim 8, characterised in that the strip-shaped element (10) has a flexural strength of greater than 300 kPa, preferably greater than 400 kPa, the flexural strength being determined on the basis of the standard ISO 1209-2, third edition, from the year 2007.
10. Pre-compressed sealing tape according to claim 9, characterised in that the strip-shaped element (10) has a flexural strength of greater than 500 kPa, preferably greater than 1,000 kPa, and more preferably greater than 2,000 kPa, the flexural strength being determined on the basis of the standard ISO 1209-2, third edition, from the year 2007.
11. Pre-compressed sealing tape according to any of the preceding claims, characterised in that the wrapping (4) comprises a tear-off tab (22) extending in the longitudinal direction, which serves as a pulling element for releasing the foam strip (2) and allowing its expansion.
12. Pre-compressed sealing tape according to any of the preceding claims, characterised in that the wrapping (4) is provided with at least one predetermined tear site (14), preferably a perforation line, extending in the longitudinal direction of the sealing tape.
13. Pre-compressed sealing tape according to any of the preceding claims, characterised in that the sealing tape is wound into a roll.
14. Component (12) comprising a pre-compressed sealing tape, according to any of claims 1 to 12, fastened thereto.

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