EP2423397A2 - Foam sealing strip - Google Patents

Abstract

The strip (1) has two narrow sides that are assigned in an installation condition of interior and/or outer sides of a joint with a rectangular section. Two broad sides of the strip are assigned to objects to be sealed and/or a soffit. Each narrow side comprises a coating with a water soluble substance. A film envelope (3) comprises the water soluble substance, a water soluble material and an interface formed from a water soluble thread. The envelope is provided with a longitudinal strip part (4), which is made from the water soluble material.

Description

The invention initially relates to a foam sealing strip received in an envelope, preferably foam-backed sealing strips impregnated for delayed recovery.

Such foam sealing strips have already become known in various embodiments. From the EP 323 589 A1 ( WO 200102192 A1 ) or the US 5 072 952 A For example, a foam sealant strip in a foam wrapper is known. From the EP 1131525 A1 or the US Pat. No. 6,672,597 B1 For example, a delayed release impregnated foam sealing strip in a film wrapper is known. Next is also on the EP 1 795 664 A1 to refer.

The known, received in an envelope foam sealing strips are to open the expansion either cut or tear.

Based on the cited prior art, the invention deals with technical problems to provide a recorded in an envelope foam sealing strip, in which the expansion of the foam strip can be released in a simple manner.

A possible solution of the mentioned technical problem is given according to a first idea of the invention in an article in which the envelope consists at least partially of a water-soluble substance. Such foam sealing strips are placed in a package, preferably in roll form, on a construction site, where they are then used in sealed joints. So you will not be exposed to moisture until then. Due to the fact that such a casing now at least partly and preferably above-possibly in this sub-region-an entire length of the foam sealing strip consists of a water-soluble substance, it is possible in a simple manner to place the foam sealing strip in the envelope into a joint to be sealed use and then, at a selected time, to wet the foam sealing strip with water, so that the envelope dissolves at least in a partial area and the foam strip can expand.

Preferably, the water-soluble material consists entirely of water-soluble constituents. The water-swellable material preferably consists entirely of water-swellable constituents, optionally in combination with water-soluble constituents. Water-insoluble components are thus avoided, which could remain on the separation area (area cut through by water application) of the sealing strip.

Further features of the invention are explained below, also in the figure description and the drawing, often in their preferred assignment to the already described or illustrated concept, but they can also be assigned to only one or more individual features described herein or diagrammatically represented or be independent or in another overall concept of importance.

Preferably, the envelope comprises or consists of a film of a water-soluble material. Optionally, the sheath comprises or consists of a foil of a water-swellable material. If the wrapper consists of a water-soluble or water-swellable film, then the film preferably surrounds the foam strip over its entire circumference and / or its entire length.

According to a further development, it is preferred that the covering has a seam formed from a water-soluble thread. In this case, it is not a closed enclosure, but an envelope formed by folding, for example, wherein the marginal edges are then sewn against each other, with the example, water-soluble thread. With the exception of the water-soluble thread such an embodiment with respect to one or more further features then the embodiments of the WO 2001 021921 AI or the US Pat. No. 6,672,597 B1 also, where appropriate, with regard to combination with a bar. The disclosure of the cited documents is hereby incorporated in full in the disclosure of this application, also to include one or more features of said documents in claims of this application (in corporation by reference). However, it can also be alternatively or additionally provided that the envelope has a longitudinal strip or longitudinal section which is formed entirely from water-soluble or water-swellable material. The longitudinal strip extends here overall in the longitudinal direction of the sealing strip, it can extend in a straight line in the sealing strip longitudinal direction or zig-zag or wavy or helical, so around the sealing strip body circulating. Preferably, the longitudinal strip extends continuously over the entire length of the sealing strip. Optionally, less preferably, the longitudinal strip may also be other non-water soluble and / or non-water-swellable material sections to be broken. Preferably, the longitudinal strip extends completely on one side of the sealing strip which is accessible from one side, for example from a joint (or side of a joint), so that the longitudinal strip can be dissipated or swelled by exposure to moisture from one side and the sealing strip for delayed recovery is releasable. The longitudinal strip can extend over ≤ 25-50% or ≤ 10-15% or ≤ 5% of the circumference of the sealing strip; it can exceed ≥ 0.5-1% or ≥ 2-3% or even ≥ 5-10% extend the circumference of the sealing strip. Preferably, the respective longitudinal strip extends over 0.5-25% or 1-20% of the circumference of the sealing strip, which on the other hand, due to its selected width easily detected by applied water on the other hand is not too narrow, and thus enables a reliable detection during the application.

Also, particularly preferably, the sheath may consist entirely of water-soluble or water-swellable material, in particular in the form of a film, as it does not depend in particular on a specific installation position of the sealing strip in the joint to ensure the application of water or moisture, and what also manufacturing technology is advantageous. In the latter two cases, it is also possible to integrally form the envelope, approximately corresponding to a sausage casing. On the other hand, however, a suturing, gluing or welding or other combination of ends of a folded wrapper may additionally be provided.

In particular, in the latter cases, then, for example, a conventional connection of the longitudinal edge edges of the enclosure may also be formed with regard to suturing etc.

The invention further relates to a foam sealing strip, in particular for delayed recovery impregnated foam sealing strip, the foam sealing strip in preferably rectangular cross-section two in the installed state of an inside or outside of a joint associated narrow sides and two sealed object or one Have soffit assigned broadsides and wherein further in any case a narrow side is coated.

Such an object is for example from the DE 3133 271 AI known. Here the coating is made to achieve a greater tightness. The coating is realized by a liquid-impermeable layer having such extensibility
owns that it can perform the recovery of the foam with.

Proceeding from this, the invention is concerned with the technical problem of specifying such a foam sealing strip, which can be advantageously installed in a joint to be sealed.

To solve this problem is based on the fact that at least one narrow side has a coating with a water-soluble or water-swellable substance. This coating is preferably not or not substantially elastic. In any case, it can not complete full recovery of the foam sealing strip. Rather, it prevents the foam sealing strip on such a provision. However, by virtue of the fact that the coating is water-soluble, the provision can be released at an appropriate time by exposure to water. Preferably, such a coating is applied on both narrow sides.

The compression of the sealing strip in the non-water-affected envelope is preferably made to be 1/2 to 1/10 of the initial thickness (fully recovered state) of the foam, for example, 1/3 to 1/5 thereof.

With regard to the coating material, reference is also made to the materials specified below. It may be undiluted or diluted such materials / especially water-activatable organic polymers.

At least one, preferably exactly one, optionally both side surfaces of the sealing strip can with a
Be provided coating, which adjusts the water vapor diffusion resistance (preferably in the sense of inside from denser than outside ") and / or driving rain of the sealing strip Such coatings are known per se, see for example the EP 1 811 111 A1 Preferably, the side surface coating is disposed on the same side of the sealing strip as the water-soluble casing or a water-soluble portion of the casing, such as a thread or longitudinal strip. By the application of water to the dissolution of the envelope at the same time the side surface coating is exposed. As a result, the side surface coating of the water-exposed surface of the sealing strip faces and penetration of water into the sealing strip is prevented or at least made more difficult by the preferably hydrophobic, eg impact rain repellent or impact rain-proof side surface coating. This combination of side surface coating and formation of the envelope is therefore particularly preferred. The coating may, for example, a rainfall activity up to 600 Pa or greater or equal to 900 Pa include, but are not limited to.

Furthermore, it will be understood that the sealing strip may also comprise a plurality of different zones of the foam material, for example different with respect to the water vapor diffusion resistance and / or the air permeability of the foam material, the material thickness (in the direction of the height of the strip) and the like.

The invention further relates to a method for sealing a building joint by means of an expandable, preferably retarded for delayed recovery foam strip, wherein the foam strip is received compressed in a sheath and opening the sheath after introducing the foam strip into the building joint, the expansion of the foam strip for sealing the building joint is released. Such methods are known from the aforementioned prior art.

In the context of the present invention, in order to solve the technical problem of achieving a simple sealing of the building joint, it is proposed that the opening of the covering is carried out by exposure to water of the at least partially water-soluble covering. For example, a spraying with water can be made. In principle, the solubility in water can also be adjusted so sensitively that a reaction with the air humidity can in most cases lead to the desired result. In this case, it is advisable, the foam sealing strip before processing still in a water or. moisture-proof total envelope.

The invention also provides a method in which is provided for sealing a building gap with an expandable, preferably soaked for delayed recovery, foam sealing strip that the foam sealing strip is first prevented by a coating of one or both narrow sides of an expansion and that the release of the expansion by application of water of at least partially water-soluble coating is performed. This is also a foam sealing strip, the two preferably in rectangular cross-section. Installation condition of an interior

Has outside of a joint associated narrow sides and two in an article to be sealed or a soffit associated broadsides. The said coating of the narrow sides can preferably be carried out when the foam sealing strip is already in roll form. is wound up. The flat sides of the roll can then be provided with a suitable water-soluble material, for example by spraying or by roller application.

With regard to the water-soluble material, reference is made, for example, to a cellulosic material. Further, it may also be a vinyl acetate-based material. Further, a polyacrylamide-based material. With regard to the usable water-soluble threads or else of the water-soluble material as a whole, for example in the form of a longitudinal strip or an envelope, it may, for example, also be those based on polyvinyl alcohol. Otherwise, however, any known water-soluble materials are basically applicable here.

In particular, the embodiment of providing the coating of an at least partially water-soluble substance can also be used in combination with a conventional opening method and, if appropriate, embodiment thereof. So For example, the embodiment with a tear-off according to the aforementioned EP 1131 525 Al ( US Pat. No. 667,259 B1 ), even if the thread in the case of a sewing closure made of water-soluble material. The user has the opportunity to make the opening in a conventional manner, but can also, for example, at a difficult to reach installation point, or an installation point at which only much later, after any scaffolding is already removed, the opening is to be made to the opening Spray with water or by steam.

To accelerate the opening of the enclosure, hot water may be used, for example, but not limited to, at a temperature of 30-50 ° C.

For further acceleration or more targeted control of the opening speed of the sealing strip can be acted upon with steam. The steam may have a temperature of 55-200 ° C, avoiding too high temperatures to avoid damage to the sealing strip material or adjacent components. For this reason, and in conformity with the water-soluble / swellable material, the steam is preferably at a temperature of 60-150 ° C or 70-120 ° C. The steam can be saturated with water or have a water content of 50-100% or 75-100% rel. Have moisture. The steam may have substantially atmospheric pressure or an overpressure, for example in the range of 1.05 to 5 bar or 1.1 to 3 bar or or 1.1 to 2 bar (as the absolute pressure of the steam).

In the context of the invention, a water-swellable material may also be used instead of a water-soluble material, even if this is not explicitly stated. As a result of the swelling, the tensile strength of the casing is reduced, so that the sleeve is "blown up" or destroyed by the restoring force of the compressed sealing strip located in the casing and the sealing strip can then completely reset, or until it returns to the respective joint completely filled out. The swelling capacity of the material is adapted to the respective sealing strip in such a way that the swelling (and thus reduction in tensile strength) is sufficiently strong to allow the cover to "cake" before water is no longer taken up by the swellable material, and thus, for example Grooves of the wall structure on which the sealing strip is inserted, can penetrate. The swellability can be adjusted, for example, by using the swellable material in a compound with a compatible, non-swellable or low-swellable material, for example, cellulosic materials having different degrees of compression or compression (more strongly compressed cellulose is less susceptible to water absorption and therefore less swellable), Polyacrylamide-based materials of different degree of crosslinking (with increasing degree of crosslinking the swelling capacity decreases) etc. The water-swellable material used is preferably swelling at room temperature (20 ° C) when exposed to water, so that it loses its strength. However, it is particularly preferable in each case for the abovementioned material to be water-soluble, which in the narrower sense should always be understood in the context of the invention. Due to the solubility in water, no residues of the material remain on the sealing strip, since the dissolved constituents can be removed with the applied water. In particular, there is a rapid release of the provision of the sealing strip already when exposed to relatively small amounts of water. Furthermore, a clean transition of the cladding between dissolution-removed and remaining portions of the cladding is achieved, which is very advantageous for the application.

It is understood that the water which is applied to the dissolution / swelling of the sealing strip, may contain additives, for example. To adjust the wetting properties and / or the solution behavior with respect to the water-soluble material of the envelope, e.g. also salts, solvents or other additives. The additives are preferably selected such that they do not adversely affect the hydrophobicity of the sealing tape and thus its watertightness.

The sealing of the joint by means of the sealing strip is preferably a seal with respect to air permeability and / or driving rain. It is understood that the sealing strip is preferably permeable to water vapor. Optionally, however, the seal may also be of priority with regard to an improvement of the thermal insulation or a "mechanical" seal in the form of a backfill cord, under certain circumstances also form only an optical termination. The sealing strip may preferably as such completely seal off the respective joint or alternatively together with other sealing elements. It is understood that the body shape of the sealing strip is adapted to the respective requirements. The sealing strip may in particular also have a rectangular or square cross-section (in the fully relaxed state), the narrow side may in this case be larger or smaller than the broad side. The sealing strip can also be profiled in cross-section or in height, for example, so as to give zones of different compression and thus different water vapor diffusion resistance at full recovery in the joint.

Preferably, on the envelope of the foam sealing strip on the outside, particularly preferably outside the range of water-soluble or wasserquellfähigem material, a fastening means for attaching the sealing strip to a Component has. The fastening means may be, for example, a self-adhesive film or another retaining strip or, for example, suitable force or positive locking means. At the level of the outside fastener (but possibly also elsewhere) may be provided on the inside of the envelope, a fastener such as an adhesive, a self-adhesive layer or a stitching to the foam sealing strip with the cover open to the rest of the envelope and / or opposite to fix the outside fastening means in its position. The area of the envelope, (usually the complete enclosure consists of the same water-soluble material) on which inside and / or outside a fastener is arranged, is preferably not or possibly only partially made of water-soluble or wasserquellfähigem material, groove partially preferably such in that, as a result of the other subregions of the envelope, they also have a strength when exposed to water (preferably also when water is applied in excess), so that this area can carry the weight of the sealing strip in order to be able to hold the sealing strip on the respective component.

• Fig. 1 in perspektivischer Ansicht einen im komprimierten Zustand in einer Folienumhüllung befindlichen Schaumstoff-Dichtstreifen;
• Fig. 2 eine schematische Ansicht eines in einer Bauwerksfuge befindlichen Schaumstoff-Dichtstreifens, nach Öffnen der Folienumhüllung;
• Fig. 3 eine perspektivische Ansicht eines zu einer Rolle aufgewickelten Schaumstoff-Dichtstreifens, wobei ein Ende abgewickelt ist;
• Fig. 4 eine Einbausituation des Dichtstreifens gemäß
• Fig. 3 in eine Fuge;
• Fig. 5 eine Darstellung gemäß Fig. 4, nach Beaufschlagung mit Wasser.

In the following, the invention will be explained further with reference to the attached drawing, which, however, represents only one embodiment. Hereby shows:

• Fig. 1 in a perspective view in the compressed state in a film wrapping foam sealing strip;
• Fig. 2 a schematic view of a present in a building joint foam sealing strip, after opening the film wrapping;
• Fig. 3 a perspective view of a wound into a roll foam sealing strip, wherein one end is unwound;
• Fig. 4 an installation situation of the sealing strip according to
• Fig. 3 into a fugue;
• Fig. 5 a representation according to Fig. 4 , after exposure to water.

Shown and described is a sealing strip 1, which consists of an open-cell, impregnated for delayed recovery foam 2 and is accommodated in a film envelope 3 in the compressed state.

The foam 2 may have a rectangular or square blank in the uncompressed state, for example.

The compression in the enclosure is preferably made to 1/2 to 1/10 of the initial thickness (fully recovered state) of the foam.

It is indicated that the film wrapping 3 has a longitudinal strip area 4 made of a water-soluble material. The other envelope may consist of conventional film material, such as a PVC film. The water-soluble strip 4 may be connected by gluing with the other film about. Also, the film wrapping 3 may be made entirely of said water-soluble material.

By spraying with water 5, for example by means of a simple water spray gun 6, as in Fig. 2 is hinted, then the opening of a so-built Schaumstoft sealing strip can be brought about. The Ex- Foaming foam 2 then presses the film edges against the soffit 7 or an object to be sealed, such as a window frame. 8

The foam sealing strip accommodated in the envelope can also fulfill the requirement of being denser inside than outside "(cf., for example, US Pat EP 1 811 111 A2 ). In such a case, an installation position is predetermined, so that, for example, only one side trained longitudinal strip of the envelope of water-soluble material is necessarily on the outside and thus may be sufficient. Even with a seam design or design with a tear-off results in such a clear installation position. Additionally or alternatively, however, a double-sided, the narrow sides of the expanded foam sealing strip associated configuration may be provided with water-soluble material. Also, a mounting position, for example, predetermining marking, such as a color marking, can be provided. The thus formed side surface, for example by a corresponding side surface coating or impregnation of the sealing strip is thus preferably arranged on the side of the sealing strip with water-soluble or wasserquellfähiger enclosure.

In addition, as in particular in the already mentioned publications WO 2001 021921 AI respectively. US Pat. No. 6,672,597 B1 described, for arresting the envelope with the foam strip inside a self-adhesive strip be provided, in addition or alternatively for attaching the foam sealing strip in a joint may on the outside of the envelope, preferably then provided on the inside and a self-adhesive strip is provided in coverage for this, a self-adhesive strip be.

Related to the Fig. 3 to 5 is another embodiment of a recoverable foam Sealing strip shown.

The foam sealing strip 9 according to Fig. 3 is wound up on a roll. An end area is already shown unwound. Preferably, the entire flat side 10 of the roll 11 is uniformly provided with a coating material which is water-soluble. This coating material may, for example, be sprayed on previously. As a result of the band shape of the sealing strip, during unwinding since, in addition, the coating material is preferably also set in a brittle manner, progressive tearing along the strip boundary can take place, namely in the illustration according to FIG Fig. 3 in the area 12.

The side surface of the sealing strip, which faces the Ümhüllungsbereich with the water-soluble or wasserquellfähigem material (and preferably facing the arrangement of the sealing strip in the joint of the open joint side) is at the same time provided with a coating to increase the driving rain, for example. To achieve a Watertightness of greater than or equal to 600 Pa. The thus unwound tape can then be inserted into a joint, according to Fig. 4 , By itself, no provision is made, so that it only on one side, here by means of a self-adhesive strip 13, and the above-described embodiment, as shown have such a self-adhesive strip 13, can be supported.

After spraying with water 5 from a spray gun 6, wherein the spraying is preferably carried out here from both sides, the coating material dissolves accordingly and the provision of the foam sealing strip is released. It comes to the sealing situation according Fig. 5 ,

All disclosed features are essential to the invention. The disclosure of the associated / attached priority documents (copy of the prior application) is hereby also incorporated in full in the disclosure of the application, also for the purpose of including features of these documents in claims of the present application. The subclaims characterize in their optional sibling version independent inventive development of the prior art, in particular to make on the basis of these claims divisional applications.

LIST OF REFERENCE NUMBERS

1

sealing strips

2

foam

3

film wrap

4

Longitudinal strip area

5

water

6

Spray gun

7

soffit

8th

window frame

9

sealing strips

10

Flat side 11 roll 12 area

13

Selfglue

Claims (12)

In a sheath (3) recorded foam sealing strip (2), preferably for delayed recovery impregnated foam sealing strip (2), characterized in that the sheath (3) consists at least partially of a water-soluble or water swellable material. Foam sealing strip according to claim 1 or in particular according thereto, characterized in that the sheath (3) has a seam formed from a water-soluble or water-swellable thread. Foam sealing strip according to one or more of the preceding claims or in particular according thereto, characterized in that the envelope (3) has a longitudinal strip (4) which is formed from water-soluble or water-swellable material. Foam sealing strip according to one or more of preceding claims or in particular according thereto, characterized in that the envelope (3) is formed entirely of water-soluble or water-swellable material. Foam sealing strip according to one or more of the preceding claims or in particular according thereto, characterized in that the sheath (3) comprises a film of water-soluble or water-swellable material or is formed overall as a film of water-soluble or wasserquellfähigem material. Foam sealing strip according to one or more of the preceding claims or in particular according thereto, characterized in that the sheath (3) on the outside, preferably outside the range of water-soluble or wasserquellfähigem material has a fastening means for attaching the sealing strip to a component. Foam sealing strip, in particular according to one of claims 1-6, in particular for delayed recovery impregnated foam sealing strip, wherein the foam sealing strip in preferably rectangular cross-section two in the installed state of an inner or outer side of a joint associated narrow sides and two to be sealed object or A broadside associated with a soffit, characterized in that one or both narrow sides has a coating with a water-soluble or water-swellable substance. Building with a joint with a sealing strip arranged in the joint according to one of the preceding claims. A method for sealing a building gap with an expandable, preferably soaked for delayed recovery, foam sealing strip (2), wherein the foam sealing strip (2) compressed in a sheath (3) is received and by opening the sheath (3) after introduction of the Schaumstoff-Dichtstreifens (2) in the building joint expansion of the foam sealing strip (2) for sealing the building joint is released, characterized in that the opening of the enclosure (3) by applying water at least partially water-soluble or wasserquellfähig formed envelope (3 ) is carried out. A method for sealing a building gap with an expandable, preferably soaked for delayed recovery, foam sealing strip (2), the foam sealing strip in preferably rectangular cross-section two in the installed state of an inside or outside of a joint associated narrow sides and two sealed in an object or a soffit associated broadsides, characterized in that the foam sealing strip is first prevented by a coating of one or both narrow sides of an expansion and that the release of the expansion is carried out by exposure to water of at least partially water-soluble or wasserquellfähig formed coating. Method according to claim 9 or 10 with a sealing strip according to one of claims 1 to 7. Method according to one of claims 9 to 11, characterized in that the water in the form of a spray or in the form of steam is applied to the sealing strip.

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