EP2982821A1 - Sliding element and method for its production - Google Patents

Abstract

Sealing element, in particular joint sealing strip, for sealing a gap between an interior of a building, vehicle or the like and the environment, comprising a impregnated with a impregnating foam body (20), characterized in that the impregnating agent in the foam body (20) is distributed unevenly and that due to the uneven distribution of the impregnating agent in the foam body (20), the impregnated foam body (20) has a lower density in a first section (22) than in a second section (24).

Description

The invention relates to a sealing element, in particular a joint sealing strip, for sealing a gap between an interior of a building, vehicle or the like and the environment and a method for its production.

Sealing elements of the above type are used in particular for sealing a window frame and are known in the prior art in various embodiments. The sealing elements are therefore intended in particular for use in construction. For example, foam-like sealing elements are used in window construction, wherein these are inserted between a window frame and the masonry in a compressed state to then expand and seal a gap existing between the window frame and the masonry. The sealing elements used hitherto are partly expensive due to the materials used and / or the manufacturing process.

In the sealing of buildings, but also vehicles or the like, it has proven to be advantageous to perform the seal on the inner side facing the respective inner side closer than on the respective outer space or the environment facing outside. The reason for this is that from the rather warm in the colder season and optionally humid interior as possible no air and preferably no steam should penetrate into the seal, because the humid air would cool in the seal and liquid could possibly condense. This can lead to an accumulation of moisture in the seal and possibly to mold growth to lead. In contrast, the outer part of the gasket should be more permeable to air, and especially steam, so that any moisture contained in the gasket may well diffuse outward.

In order to realize these functions, multilayer gaskets are known in the art. For example, a relatively permeable film is attached to the side of a foam body facing the outside and a film which is relatively impermeable to air and steam is applied to the side facing the interior area. However, the production of such sealing systems is relatively complicated. In addition, sealing systems are known which contain so-called thermoexpandable substances. The thermoexpandable substances contained in the foam body are designed so that they occupy such different volumes at the usually prevailing indoor and outdoor temperatures that the surrounding foam is compressed more on the warmer side than on the colder side. This ensures that in the winter, the sealing system is closer to the side facing the interior and thus better seals than on the outside. In summer the conditions are exactly the opposite.

The invention has for its object to provide a sealing element, in particular joint sealing strip, which ensures a good seal of an interior of a building, vehicle or the like from the environment and is possible to produce inexpensively. The invention is also based on the object of specifying a method for producing such a sealing element.

The object is achieved by a sealing element according to claim 1 or claim 13 and a method according to claim 10. Preferred embodiments of the invention are specified in the dependent claims and the following description, in particular in conjunction with the accompanying figures.

The sealing element according to the invention, in particular joint sealing tape, for sealing a gap between an interior of a building, vehicle or the like and the environment comprises a impregnated with an impregnating foam body, wherein the impregnating agent is distributed unevenly in the foam body and by the uneven distribution of the impregnating agent in the foam body the impregnated foam body in a first section has a lower density than in a second section.

The inventive method for producing a sealing element, in particular a joint sealing strip, for sealing a gap between an interior of a building, vehicle or the like and the environment, comprises the following steps: producing a foam body, impregnating the foam body with an impregnating agent and different compression of the impregnated Foam body for creating (causing) an uneven (inhomogeneous) distribution of the impregnating agent in the foam body.

According to a preferred embodiment, the foam body is formed flat. The sealing element or the foam body expediently has a rectangular cross-section or a rectangular profile, wherein the width according to one embodiment is in a range of about 5 to 70 mm, for example in a range of about 10 to 50 mm. The height (narrow side) is in a range of about 1 to 25 mm, for example in a range of about 2 to 18 mm. Sealing elements of this size are advantageously suitable for a variety of applications, from the construction sector (buildings, houses, windows, etc.) to mobile applications, such as e.g. the motor vehicle construction.

Typical lengths of the sealing element are, for example, in a range of about one to several meters, for example 20 m. Over the length of the sealing element, the distribution of Imrägniermittels is advantageously constant. This is advantageous because uniform sealing properties are achieved, for example along a joint to be sealed.

A first basic idea of the invention can be seen in the provision of a sealing element, in particular joint sealing strip, which has a higher volume weight in a first section due to a different degree of impregnation and a lower density in a second section. The first portion is preferably an edge portion (edge region) of the foam body adjoining a first outside (outer surface) of the sealing element. The second section is preferably an edge section (edge region) of the foam body which adjoins a second, in particular opposite outer side (outer surface). The sealing element thus preferably has a lower density in the region of a first outer side than in the region of a second, opposite outer side. The volume weight increases within the sealing element from the first outer side to the second outer side or from the first edge region to the second edge region, in particular over a width of the sealing element. The outer sides are preferably narrow sides of a strip-shaped sealing element, wherein strip-shaped means in particular a sealing element with a rectangular cross-section. In the installed state of the sealing element, the first outer side preferably faces an outer region or the surroundings of a building, vehicle or the like to be sealed, and the second outer side faces an inner region or interior space. Due to the higher volume weight on the side of the sealing element facing the interior, the sealing element seals toward the interior more strongly than to the outside area or to the surroundings. The sealing element, or sealing strip, is thus denser inside than on the outside due to the successive increase in the weight gain. The density is inhomogeneous.

Another basic idea of the invention can be seen therein, the spatially uneven distribution of the impregnating agent in the foam body by a spatially uneven squeezing out of the impregnating after to cause a complete impregnation of the foam body. The foam body is therefore first soaked completely with impregnating agent; Subsequently, a part of the impregnating agent is removed again, wherein in a first portion of the foam body more impregnating agent is removed than in a second portion of the foam body. It is provided in particular that the foam body is compressed more strongly in the first section than in the second section. In this way, the concentration of the impregnating agent, which increases from the first outside to the second outside of the foam body, can be achieved in a simple and cost-effective manner. In addition, a desired concentration profile can be set precisely.

In a preferred embodiment, the volume weight within the foam body increases from the first section to the second section, in particular from a first edge region of the foam body to a second edge region of the foam body, continuously, continuously or successively. Due to the continuous, in particular monotonically increasing impregnating agent concentration from the first section to the second section, in particular from the first edge area to the second edge area or from the first outside to the second outside, a continuous increase in the tightness of the sealing element is achieved.

In addition, the sealing element / the foam body may also be progressively impregnated / impregnated, whereby a progressive increase in the weight gain is achieved. This allows a very differentiated setting of a (desired) space-weight gradient.

The volume weight preferably increases from the first section to the second section, in particular from the first edge area to the second edge area, by at least a factor of two. The increase in the density caused by the impregnating agent concentration allows a good seal to the interior of a building and, as it were, sufficient vapor diffusion for Outside. The ratio of the volume weight of the first portion to the density of the second portion may be less than 0.5, preferably less than 0.3, and more preferably less than 0.15.

The volume weight of the impregnated foam body in the first section or in the first edge region is preferably 25 kg / m ³ to 55 kg / m ³ , more preferably 30 kg / m ³ to 45 kg / m ³ and particularly preferably 35 kg / m ³ to 40 kg / m ³ . These values have proven to be advantageous for ensuring good vapor diffusion to the outside.

Preferably, the density of the impregnated foam body in the second section, or in the second edge region, 65 kg / m ³ to 135 kg / m ³ , more preferably 75 kg / m ³ to 120 kg / m ³ and particularly preferably 85 kg / m ³ to 100 kg / m ³ . These values have proved to be advantageous in order to achieve a good tightness.

In a further preferred embodiment of the invention, the foam body is completely penetrated by the impregnating agent. This is understood to mean, in particular, that impregnating agent is present both on all outer regions of the foam body and in its core. For this purpose, the foam body is first completely impregnated with impregnating agent, wherein the impregnating agent penetrates from the outer sides of the foam body to its core and partially or completely fills the pores of the foam body. The (homogeneous) uniform distribution of the impregnating agent is ensured in particular by impregnation, for example via a corresponding immersion bath. It is thus first produced a homogeneously impregnated foam body. After removal of part of the impregnating agent from the homogeneously impregnated foam body of the foam body is still completely or consistently impregnated, but no longer homogeneous, but inhomogeneous. The amount of saturant per volume element within the foam body increases in a first direction and falls in an opposite, second direction. This refers in particular to a change in the distribution over the width of the sealing element.

Alternatively, however, the impregnating agent may also be completely or approximately completely removed, at least in sections. Starting from a sealing element / foam body having a rectangular cross section, the sealing element can be completely or approximately completely removed, at least in the area of a narrow side, for example over a range of about 0.5 to 5 mm starting from the corresponding narrow side, based on the width of the sealing element.

According to one embodiment, the content of impregnating agent, for example in an area of at least one of the two narrow sides, is therefore constant. According to one embodiment, the content of impregnating agent is e.g. (Starting from a narrow side of a sealing element with a rectangular cross-section) over a range of about 0.5 to 5 mm constant, the content may be constant "0" or possibly greater so "0". The impregnating agent may therefore not be distributed unevenly over an entire width of the sealing element but may also be homogeneous, at least in regions. In other words, the sealing element is thus at least partially distributed unevenly. This allows a very precise and above all needs-based adjustment of the volume weight.

To distinguish the outside with the higher volume weight from the outside with the lower density of the first outer surface and / or the second outer side may be optically marked, for example. By a colored mark. The color marking can be done, for example, by a paint application or a film sticker. It is particularly preferred that the inside, ie the side of the sealing element directed towards the interior, is color-coded, that is to say the side of the sealing element with the higher volume weight.

In a further preferred embodiment it is provided that the caused by the impregnation increase in space weight of the foam body in the first section or in the first edge region is 3% to 10%, preferably about 4% to 8% and particularly preferably 5% to 6%.

The volume weight increase of the foam body in the second section (second edge area) caused by the impregnation is preferably 50% to 300%, in particular preferably 90% to 240% and particularly preferably 140% to 190%.

With regard to the method according to the invention, it is preferred that the different compression of the impregnated foam body takes place by rolling the impregnated foam body with at least one profiled roller. The profiled roller is in particular a roller, in the longitudinal direction of which recesses and elevations are formed alternately. In other words, the diameter of the roller increases and decreases alternately along its axis of rotation, in particular uniformly and / or periodically. By rolling with a profiled roller, the impregnating agent from different areas of a foam body, in particular a foam plate, is expressed to different degrees. The shape and configuration of the roll profile allows a very simple and individual adjustment of the content of impregnating agent, for example from linear to progressive or degressive etc. In this way, a foam sheet can be produced, which alternately strips having a high impregnant concentration and a lower impregnant concentration. In particular, a consistent material quality or uniform sealing properties can be provided along a length of the sealing element. The foam sheet is then preferably cut along the regions of higher saturant concentration and lower saturant concentration to produce strip-shaped seal members, particularly joint sealants.

In this context, the method according to the invention preferably comprises the further method step of cutting the foam body, in particular a foam sheet, into strip-shaped sealing elements areas of higher density and areas of lower density.

Finally, the invention relates to a sealing element which is produced by a method according to the invention. The sealing element produced in particular by impregnation in an impregnating agent and subsequent rolling by means of a profiled roller can be produced with predetermined properties, in particular a predetermined density profile.

Fig. 1

ein teilweise aufgerolltes, streifenförmiges Dichtungselement gemäß der Erfindung;

Fig. 2

ein Walzenpaar zur Verwendung bei der Herstellung eines erfindungsgemäßen Dichtungselements;

Fig.3

eine Querschnittsansicht einer Schaumstoffplatte nach einem Walzvorgang mittels mindestens einer profilierten Walze.

The invention will be further described with reference to preferred embodiments, which are illustrated in the accompanying schematic figures. Shown in the figures:

Fig. 1

a partially rolled, strip-shaped sealing element according to the invention;

Fig. 2

a pair of rollers for use in the manufacture of a sealing element according to the invention;

Figure 3

a cross-sectional view of a foam sheet after a rolling process by means of at least one profiled roll.

Identical or equivalent elements are indicated in all figures with the same reference numerals.

Fig.1 shows an embodiment of a sealing element 10 according to the invention, in particular joint sealing tape. The sealing element is provided in particular for sealing a joint, for example between a door or a window and a masonry.

The sealing element 10 is strip-shaped and has a rectangular cross-section. In principle, however, are also other cross-sectional designs possible. The sealing element 10 is designed strip-shaped and erstrecht along a longitudinal direction 2. It can be rolled up in the longitudinal direction 2 and pack in a space-saving manner.

The cross section of the sealing element 10 is bounded by a first outer side 12, an opposite, second outer side 14 (high sides or narrow sides) and a third outer side 16 and a fourth outer side 18 (transverse sides or broad sides). The respective opposite outer sides or outer surfaces are preferably arranged parallel to one another. The sealing element 10 has a quadrangular, in particular rectangular, cross-section.

In the installed state of the sealing element 10, it is provided that the first outer side 12 faces an interior, for example of a building or vehicle, and the second outer side 14 faces an outer space or an environment. The opposite outer sides 16, 18 are provided for abutment with adjacent components, such as a window or door frame or to a masonry or a vehicle body. The extension direction between the first outer side 12 and the second outer side 14 is referred to as the width of the sealing element 10. The direction of extension between the third outer side 16 and the fourth outer side 18 is referred to as the height or thickness of the sealing element 10. The sealing element 10 may be precompressed so that it expands after unrolling or after its installation in height.

• Nettorohdichte nach DIN EN ISO 845: 38 kg/m³ +/- 15%
• Luftdurchlässigkeit nach DIN EN ISO 9237 (Druckdifferenz 200 Pa, Schaumdicke: 20 mm): 80,00 - 450,00 It/m2/s
• Zellenzahl: 60 ppi +/- 10 ppi.

The sealing element 10 is essentially formed by a foam body 20, which is made of PUR foam. The foam body 20 used is in particular an open-pore foam body having the following properties:

• Net density according to DIN EN ISO 845: 38 kg / m ³ +/- 15%
• Air permeability according to DIN EN ISO 9237 (pressure difference 200 Pa, foam thickness: 20 mm): 80.00 - 450.00 It / m2 / s
• Number of cells: 60 ppi +/- 10 ppi.

The details given relate to the PU foam, in particular before impregnation.

The foam body 20 is impregnated with an impregnating agent. The impregnating agent is preferably an acrylate or rubber dispersion which may additionally contain fillers and / or auxiliaries. By impregnating the density of the impregnated sealing element is increased after its drying compared to the unimpregnated foam. In the case of the sealing element 10 according to the invention, a second section 24 (second edge region), which faces the second outer side 14, contains more impregnating agent and thus has a higher density than a first section 22 (first edge region), which faces the first outer side 12. The first section 22 and the second section 24 extend side by side in the longitudinal direction 2 of the sealing element 10. Within the sealing element 10, the concentration of the impregnating agent or the density of the space increases from the first outer side 12 to the second outer side 14. The second outer side 14 is in the installed state facing a window or a door and the first outer side 12 of an adjacent soffit or an adjacent window or lintel.

The foam body 20 is constructed in one piece or integrally or integrally and, prior to its impregnation, has homogeneous properties, in particular a homogeneous density, structure and pore distribution.

The production of a sealing element 10 according to the invention will be described below with reference to FIGS FIGS. 2 and 3 described. First, a molded body 30 made of a foam material, in particular PUR foam produced. The molded body 30 (foam body) is plate-shaped and has a thickness or height, which preferably corresponds to the thickness or height of the finished sealing element 10. The length corresponds at least to the length of the sealing element, but can also be a multiple. The molded body 30 has an upper side 32 and a lower side 34, which extend along the plane of the plate-shaped molded body 30 and form the outer sides 16 and 18 in the sealing element 10 to be produced.

The molded body 30 is impregnated with an impregnating agent. For this purpose, the molded body 30 is preferably immersed in the impregnating agent, so that the impregnating agent penetrates into the pores of the molded body 30 and completely penetrates the molded body 30. The impregnating agent thus fills the pores of the molded body 30. For this purpose, an open-pore foam body is preferably used as the foam body 30.

After impregnation, the molded body 30 is rolled by means of at least one profiled roller 40, in particular with a roller pair. By means of the profiled roller 40, a part of the impregnation is squeezed out of the molding 30. Shown in Fig. 2 is an example in which the molded body 30 is rolled between two rollers 40, 42, namely a profiled roller 40 and a non-profiled roller 42. The profiled roller 40 has elevations 44 and depressions 46 (constrictions) alternately along its longitudinal axis. The unprofiled roller 42 has a constant diameter along its longitudinal direction. As in Fig. 2 in the roller 42 shown with dashed lines, and the profiled roller 40 opposite roller 42 may elevations 44 'and recesses 46', which preferably the elevations 44 and recesses 46 opposite. By the elevations 44 and depressions 46, the distance between the rollers 40, 42 varies along their longitudinal directions, so that more impregnating agent is squeezed out of the molded body 30 in the region of the elevations 44 than in the region of the depressions 46 a lower impregnant concentration and areas with a higher saturant concentration. To Drying of the molded body 30 results in the lower impregnant concentration to a lower density and the higher impregnant concentration to a higher density. The density is in the FIGS. 1 and 3 visualized by a dot density. The distribution of the volume weight is additionally in Fig. 3 represented by a dashed line, which shows a substantially sinusoidal course.

After drying of the molded body 30, it is cut along areas having a maximum impregnant concentration or a maximum density and areas of a minimum impregnant concentration or a minimum density. The cutting lines are in Fig. 3 visualized by the reference numeral 38. This results in strip-shaped sealing elements 10, whose volume weight continuously increases from the first outer side 12 to the second outer side 14.

To distinguish the outer side 12 and 14, one of the outer sides, preferably the second outer side 14, may be provided with a color marking. Due to the space weight gradient within the sealing element 10, a vapor diffusion to the outside, ie to the first outer side 12, is given. The volume weight increases from the outside, ie the first outer side 12 inwards, ie to the second outer side 14, for example from 40 kg / m ³ to 100 kg / m ³ .

The inventive, progressively impregnated or impregnated sealing element (multifunction belt) is inexpensive to produce and has along its width increasing or decreasing tightness / diffusibility.

LIST OF REFERENCE NUMBERS

2

longitudinal direction

10

sealing element

12

first outside

14

second outside

16

third outside

18

fourth outside

20

foam body

22

first section

24

second part

30

moldings

32

top

34

bottom

38

cutting line

40

roller

42

roller

44

survey

46

deepening

Claims (13)

Sealing element, in particular joint sealing tape, for sealing a gap between an interior of a building, vehicle or the like and the environment, comprising
a foam body impregnated with an impregnating agent (20), characterized
that the impregnating agent is distributed unevenly in the foam body (20) and
that due to the uneven distribution of the impregnating agent in the foam body (20), the impregnated foam body (20) has a lower density in a first section (22) than in a second section (24). Sealing element according to claim 1, characterized in that the volume weight within the foam body continuously increases from the first portion (22) to the second portion (24). Sealing element according to claim 1 or 2, characterized in that the volume weight of the first portion (22) to the second portion (24) increases by at least a factor of two. Sealing element according to one of claims 1 to 3, characterized in that the density of the impregnated foam body (20) in the first section (22) 25 kg / m ³ to 55 kg / m ³ , and / or that the density of the impregnated foam body (20) in the second section (24) is 65 kg / m ³ to 135 kg / m ³ . Sealing element according to one of claims 1 to 4, characterized in that the foam body (20) is completely penetrated by the impregnating agent. Sealing element according to one of claims 1 to 5, characterized in that the caused by the impregnation increase in space weight of the foam body (20) in the first section (22) is 3% to 10%, and / or
the volume weight increase of the foam body (20) caused by the impregnation in the second section (24) is 50% to 300%. Sealing element according to one of the preceding claims,
wherein the foam body (20) is flat, in particular having a rectangular cross-section. Sealing element according to one of the preceding claims,
wherein the foam body (20) is impregnated with the impregnating agent. Sealing element according to one of the preceding claims,
wherein the foam body (20) is progressively impregnated. Method for producing a sealing element (10), in particular a joint sealing strip, for sealing a gap between an interior of a building, vehicle or the like and the environment, in particular a sealing element (10) according to one of claims 1 to 6, comprising the method steps: Producing a foam body (20, 30), - Impregnating the foam body (20, 30) with an impregnating agent and - Different degrees of compression of the impregnated foam body (20) for generating a non-uniform distribution of the impregnating agent in the foam body (20, 30). A method according to claim 10, characterized in that the different degrees of compression of the impregnated foam body (20, 30) by rolling the impregnated foam body (20, 30) with at least one profiled roller (40). A method according to claim 10 or 11, characterized by the further method step of cutting the foam body (20, 30) into strip-shaped sealing elements (10) along areas with a higher density and / or areas with a lower density. Sealing element, in particular joint sealing strip, for sealing a gap between an interior of a building, vehicle or the like and the environment, in particular according to one of claims 1 to 6, produced by a method according to one of claims 10 to 12.

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