EP3362629A1

EP3362629A1 - Corner connector with capillaries

Info

Publication number: EP3362629A1
Application number: EP16784825.8A
Authority: EP
Inventors: Katrin Frank; Karl-Theo ROES; Erol Ertugrul SACU; Wolfgang Böttcher
Original assignee: Saint Gobain Glass France SAS; Compagnie de Saint Gobain SA
Current assignee: Saint Gobain Glass France SAS; Compagnie de Saint Gobain SA
Priority date: 2015-10-13
Filing date: 2016-10-13
Publication date: 2018-08-22
Also published as: KR20180053334A; US20180252021A1; WO2017064160A1

Abstract

The invention relates to a corner connector (I) for connecting two hollow profiled strips in insulating glass units, comprising a first plug-in limb (31), a second plug-in limb (32), a corner region (34), and a capillary tube (33) with a first opening (36) and a second opening (37), wherein - the corner region (34) connects the second plug-in limb (32) to the first plug-in limb (31), - the two plug-in limbs (31, 32) form an angle α, where 45° < α ≤ 180°, - the first plug-in limb (31), the second plug-in limb (32), and the corner region (34) are injection molded, - the capillary tube (33) is solidly enclosed at least in the corner region (34), and - in an insulating glass unit (II), the capillary tube (33) produces a connection between the inner pane interspace (12) and the surroundings.

Description

Corner connector with capillary

The invention relates to a corner connector for the connection of two hollow profile strips, an insulating glass unit, a method for their production and their use.

Insulating glazing generally contains at least two panes of glass or polymeric materials. The disks are separated from each other by a gas or vacuum space defined by the spacer. The thermal insulation capacity of insulating glass is significantly higher than that of single glass and can be further increased and improved in triple glazing or with special coatings. Silver-containing coatings, for example, enable a reduced transmission of infrared radiation and thus reduce the cooling of a building in winter.

In addition to the nature and structure of the glass, the other components of a double glazing are of great importance. The seal and above all the spacers have a great influence on the quality of the insulating glazing. Above all, the contact points between the spacer and the glass pane are very susceptible to temperature and climatic fluctuations. The connection between the disc and the spacer is produced via an adhesive bond of organic polymer, for example polyisobutylene. In addition to the direct effects on the physical properties of the adhesive bond affects especially the glass itself on the adhesive bond. Due to the temperature changes, for example due to sunlight, the glass expands or contracts again when it cools. This mechanical movement simultaneously expands or compresses the adhesive bond, which can compensate for these movements only to a limited extent by its own elasticity. In the course of the operating life of the insulating glazing, the mechanical stress described may mean a partial or full-area detachment of the adhesive bond. This detachment of the adhesive bond can subsequently allow the ingress of atmospheric moisture within the insulating glazing. These climatic loads can cause fogging in the area of the panes and a lessening of the insulating effect.

The spaces between the panes are tightly sealed to minimize the humidity in the space between the panes. This is necessary to prevent the formation of condensation, since the moisture in particular could lead to the oxidation of vapor-deposited metal-containing coatings on the discs. Due to the dense design of the space between the panes, pressure equalization with the environment is not possible. When changing the environmental conditions, such as pressure and Temperature, the pressure difference between the environment and inner space between the panes leads to a bulging or bulging of the glass panes. Among other things, this results in increased stress on the edge bond. In addition, it can come to pinching built-in moving components, such as blinds, through the bulge of the discs. To alleviate these problems, a connection can be established between the inner space between the panes and the surrounding area, which allows pressure equalization. The connection must be made in such a way that accumulation of water vapor in the space between the panes is prevented and at the same time the ingress of dirt and dust is excluded.

CH 687 937 A5 discloses an insulating glazing with a drying medium-filled hollow profile spacer frame which has perforated and unperforated sections towards the interior of the pane. For the pressure balance between the disc interior and external environment, a capillary tube is provided, which opens into an unperforated section of the spacer frame. The actual capillary tube is arranged in the outer space between the panes and is surrounded by secondary sealing means. An opening of the capillary tube faces the external environment. A disadvantage of this solution is the complex production of the finished insulating glass unit. First, a circumferential hollow profile spacer frame must be made. An opening of the sensitive capillary must then be inserted through a hole in the spacer. The capillary itself is essentially open until the final sealing in the outer space between the panes. The installation of the capillary must therefore be very careful and takes a lot of time.

DE 10 2005 002 285 A1 discloses a complicated insulating glass pressure equalization system with a capillary and a membrane, intended for use in the space between the panes of thermal insulation glasses. The pressure compensation system can also be integrated into an enlarged spacer. Another disadvantage is the complex integration of the pressure compensation system, which is fastened via stainless steel brackets in holes of the spacer.

DE 1 1 2006 001 274 T5 discloses a pipe for neutralizing pressure in a double-glazed window. The tube may be provided at one or both ends with a seat for the passage of the tube. The seat can be mounted in the area of the frame, but also in the area of the panes. There is no information on how exactly the seat is mounted. The capillary must be guided through the seat, which is very costly for lengths of more than half a meter. The object of the invention is to provide a corner connector for the connection of two hollow profile spacers, which makes it easy to manufacture a pressure-equalized insulating glass unit, as well as to provide an improved insulating glass unit and an improved method for producing such an insulating glass unit.

The object of the present invention is achieved by a corner connector according to the independent claim 1. Preferred embodiments will become apparent from the dependent claims.

An insulating glass unit according to the invention, a method for producing the insulating glass unit according to the invention and its use according to the invention are apparent from further independent claims.

The corner connector according to the invention is suitable for the connection of two hollow profile strips in insulating glass units. These hollow profile strips are used as spacers in insulating glass units. The corner connector comprises at least a first Einsteckschenkel and a second Einsteckschenkel, and a corner connector firmly integrated capillary tube having a first opening and a second opening. The corner connects the first Einsteckschenkel with the second Einsteckschenkel. The two Einsteckschenkel include an angle α, where 45 ° <α <180 °. The two Einsteckschenkel are intended to be plugged into a respective hollow profile strip and so to connect two hollow profile strips. The corner area is the area in which the two Einsteckschenkel are connected. The first Einsteckschenkel, the second Einsteckschenkel and the corner are injection-molded. Since the Einsteckschenkel and the corner area are injection-molded, the capillary is already integrated during the injection molding process and thus particularly firmly and stably fixed in the corner connector "firmly integrated" in the sense of the invention means that the capillary tube is firmly embedded or cast in the corner connector and not Since the capillary is firmly integrated in the corner connector, there is no need to drill a hollow profile strip and to subsequently introduce a capillary tube, as described in the prior art The corner connector according to the invention is installed in the course of assembly of the spacer frame and thus no longer has to be in a separate S be installed. The corner connector combines two hollow profile strips, which are assembled to form a spacer frame. The two Einsteckschenkel lie in the cavity of the hollow profile strips and are completely hidden. The invented Corner joint according to the present invention thus provides an easy way to integrate a capillary tube into an insulating glass unit with hollow profile spacers.

A spacer frame may be formed by a continuous hollow profile strip, which is bent into a frame, and whose two ends are connected by a corner connector according to the invention. A spacer frame may also be composed of an interrupted in individual sections hollow profile strip, wherein two sections of the hollow profile strip are connected by a corner connector according to the invention and the remaining portions are connected by means of corner connectors according to the prior art.

In a preferred embodiment of the corner connector according to the invention, the capillary tube is bent or wound at least in a partial region. The capillary tube may, for example, be curved in a wave shape or wound into a cylindrical spiral. By bending the capillary tube, the length of the capillary tube to be installed is shortened compared to a stretched shape of the capillary tube. The length to be installed b of the capillary tube in a bent or wound shape is shorter than the length to be installed s of the capillary tube in an elongated form. Therefore, even in relatively small glazing with edge lengths of up to half a meter, a relatively long capillary tube can be arranged, which in stretched form would have a length of, for example, 80 cm. Suitable capillaries are typically more than half a meter in elongated form and are therefore difficult to process. The space-saving arrangement of the capillary has the additional advantage that the corner bracket is easier to store and assemble. Previously, the use of tortuous capillaries was very difficult because capillary tubes were introduced according to the prior art only later through a hole in a spacer, which is very difficult for curved capillaries. Since the corner angle according to the invention is injection-molded, the capillary can be easily integrated into the corner angle even in bent form and later be easily installed in the insulating glass unit. Preferably, the ratio of the length b of the capillary tube to be installed in curved or helical form to the length s of the capillary tube in an elongated form is 0.05 <b / s <0.55, particularly preferably 0.1 <b / s <0, 35th Particularly good results are achieved in this area.

In a further preferred embodiment of the corner connector according to the invention, the capillary tube projects out of the corner connector on an end face of the first insertion leg, is arranged within at least the first insertion leg and projects out of the corner region of the corner connector. The first opening of the capillary tube is located at the end of the capillary tube protruding from the corner region and the second opening is located at the protruding end of the first end. In this arrangement, the capillary tube in the finished insulating glass unit can connect the cavity of the hollow profile strip with the atmosphere. Since the hollow profile strip is usually permeable to gas to the inner space between the panes, a pressure equalization between the environment and the inner space between panes is made possible in the finished insulating glass unit. In addition, the capillary tube is well protected in this arrangement from damage, for example during transport or assembly of the insulating glass unit. Since the capillary is integrated in the corner region of the corner connector, is disposed within the first Einsteckschenkels and ends in a section of a hollow profile bar, it remains hidden from view of the finished insulating glass window.

The end face of a Einsteckschenkels is the surface which faces when inserting the corner connector in a hollow profile strip to the cavity. The front side is thus not on an inside of the hollow profile strip. After connecting the Einsteckschenkel with a hollow profile strip, the side surfaces of the corner and the corner surface of the corner area are exposed. The side surfaces of the corner region are the surfaces facing the outer panes in the finished insulating glass unit and arranged parallel to the outer panes of the insulating glass unit. The side surfaces of the corner area may also be connected to the outer panes. The corner surface is the surface facing the environment in the finished insulating glass unit or at least partially in contact with the secondary sealant.

In a preferred embodiment of the corner connector according to the invention, the first insertion angle and the second insertion angle include a right angle. This form is particularly stable and suitable for the production of common rectangular insulating glass windows.

In a further preferred embodiment of the corner connector according to the invention, the first opening of the two-sided open capillary tube is reversibly closed at the end protruding from the corner region, for example by a rubber cap. The closure serves to protect the first opening from the ingress of dirt or secondary sealant used in sealing the insulating glass unit.

The capillary tube is preferably made of a metal, particularly preferably made of stainless steel, aluminum or an aluminum-containing alloy. With these materials, the penetration of water vapor into the inner space between the panes is particularly effectively avoided, as has been shown in experiments. Particularly preferably, the capillary tube is surrounded by metal with a protective sheath made of a plastic. That's how it works sensitive capillary tube protected from damage during transport and installation. The capillary tube can also be made of a plastic in a further preferred embodiment. The capillary tube then has on the inside a metal-containing coating.

The capillary tube preferably has an inner diameter of 0.4 mm to 0.8 mm, particularly preferably 0.5 mm to 0.7 mm. The wall thickness of the capillary tube is preferably 0.1 mm to 0.3 mm, particularly preferably 0.2 mm. The length of the capillary tube depends on the dimensions of the insulating glass unit. It should have in stretched form a minimum length of about 60 cm, so that the pressure equalization can be realized without water vapor penetrates into the inner space between the panes.

The corner connector is preferably rigid. This means that after production of the corner connector with integrated capillary, it is no longer bendable in the corner area. The angle α can then no longer be changed significantly, that is to say changed by no more than 5 °, preferably no more than 1 °. This design improves the stability of the corner connector and prevents damage to the capillary tube in the corner area.

The Einsteckschenkel and the corner region are preferably made of a polymer and particularly preferably include polyethylene (PE), polycarbonate (PC), polypropylene (PP), polystyrene, polybutadiene, polynitriles, polyesters, polyurethanes, polymethylmethacrylates, polyacrylates, polyamides, polyethylene terephthalate (PET) , Polybutylene terephthalate (PBT), preferably acrylonitrile-butadiene-styrene (ABS), acrylic ester-styrene-acrylonitrile (ASA), acrylonitrile-butadiene-styrene / polycarbonate (ABS / PC), styrene-acrylonitrile (SAN), PET / PC, PBT / PC and / or copolymers or mixtures thereof.

In one possible embodiment, the insertion leg and the corner area are fiber-reinforced. The corner connector preferably has a fiber content of 5% to 60%, particularly preferably from 20% to 50%. The fiber content in the corner connector according to the invention improves the strength and stability. By choosing the fiber content, the coefficient of thermal expansion of the corner connector can be varied and adapted to the hollow profile spacer. Preference is given to using natural fibers or glass fibers, particularly preferably glass fibers, for reinforcing the corner connector.

In an alternative embodiment, the corner connector can also be made of metal.

In a preferred embodiment of the connector according to the invention, at least the outer surface of the corner region is provided with a water vapor-tight barrier. These Barrier is preferably a metal layer that is applied directly to the outer surface of the corner region. This metallization contains aluminum, aluminum oxides and / or

Silicon oxides and is preferably applied via a PVD (Physical Vapor Deposition) method. The coating containing aluminum, aluminum oxides and / or silicon oxides gives particularly good results in terms of tightness. Alternatively, a metal-coated film can be used. In particular, in connectors made of polymeric materials which have a high permeability to water vapor, such an additional barrier to improve the tightness of the edge bond is advantageous.

A method for producing a corner connector according to the invention initially comprises the provision of a capillary which has already been bent into the desired shape. Subsequently, the capillary is inserted into an injection mold, in which then the corner connector comprising the first and second Einsteckschenkel and the corner area, is poured. After the material has hardened, the finished corner connector can be removed from the injection molding tool.

Furthermore, the invention comprises an insulating glass unit with a corner connector with integrated capillary tube, in particular a corner connector according to the invention. The insulating glass unit according to the invention comprises at least a first disk, a second disk arranged parallel thereto, and a spacer frame arranged between the first disk and the second disk. The first disc, the second disc and the spacer frame define an inner disc space. The spacer frame comprises at least one hollow profile strip and a corner connector comprising at least a first Einsteckschenkel, a second Einsteckschenkel, a corner region and a capillary tube integrated at least in the corner. The first Einsteckschenkel is connected to the second Einsteckschenkel in the corner. The first Einsteckschenkel, the second Einsteckschenkel and the corner are injection-molded. The first Einsteckschenkel and the second Einsteckschenkel are each inserted into one end of the hollow profile strip. Thus, the corner connector connects the hollow profile strip to a complete spacer frame. The capillary tube integrated in the corner connector is arranged so that it creates a connection between the inner space between the panes and the atmosphere, thus enabling pressure equalization. Thus, in the case of the insulating glass unit according to the invention with a capillary tube integrated in the corner connector, a pressure equalization is ensured in the event of changes in the ambient conditions. Since the capillary tube according to the invention is integrated in the corner connector, the insulating glass unit can be produced particularly easily. The hollow profile strip may comprise a plurality of interrupted sections, which are each assembled in the corners of the insulating glass unit to a complete frame. The sections may be welded together, glued together or mated together via connectors. The hollow profile strip can also be made continuously and bent in the corners. Preferably, the spacer frame is rectangular. In this form most insulating glass units are manufactured.

The spacer frame is preferably fixed between the first disc and the second disc via a primary sealant. This achieves a good seal of the inner space between the panes and the outside environment. The penetration of moisture and the loss of any existing gas filling are thus prevented. The primary sealant preferably contains a polyisobutylene. The polyisobutylene may be a crosslinking or non-crosslinking polyisobutylene.

As a hollow profiled strip, a hollow profile spacer line known from the prior art can be used independently of its material composition. By way of example, polymeric or metallic hollow profile strips are mentioned here.

In a preferred embodiment of the insulating glass unit according to the invention, the hollow profile strip comprises at least a first side wall, a second side wall arranged parallel thereto, a glazing interior space wall arranged perpendicular to the side walls and an outer wall. The glazing interior wall connects the side walls together. The outer wall is arranged substantially parallel to the glazing inner wall and connects the side walls together. The first side wall, the glazing interior wall, the second side wall and the outer wall enclose a cavity. The cavity improves the thermal conductivity of the hollow profile strip compared to a solid profile strip and can, for example, absorb a desiccant. The glazing interior wall contains at least one gas-permeable section, so that there is a connection between the cavity and the interior space between the panes. In the permeable section, the exchange of gas and moisture between the inner space between the panes and the cavity is possible. At least in the permeable section, the cavity contains a desiccant which possibly absorbs moisture present in the inner space between the panes and thus prevents fogging of the panes. The permeability of the glazing interior wall can be achieved by the use of a porous material and / or by at least one perforation in the glazing interior wall. The glazing interior wall preferably contains perforations in the permeable section. The total number of perforations depends on the size of the insulation glass unit off. The perforations connect the cavity to the inner space between the panes, allowing gas exchange therebetween. The perforations are preferably designed as slots, particularly preferably as slots with a width of 0.2 mm and a length of 2 mm. The slots ensure optimal air exchange without the possibility of drying agents penetrating from the cavity into the inner space between the panes.

The first side wall and the second side wall of the hollow profile strip are provided so that the first disc and the second disc are fixed there. Preferably, the first disc and the second disc are attached to the first side wall and to the second side wall via a primary sealing means. The inner space between the panes is delimited by the first pane, the second pane and the glazing interior wall of the hollow profile strip. The outer wall of the hollow profile strip and the first and second disc define an outer space between the panes. The outer space between the panes is preferably filled with a secondary sealant. The secondary sealant contributes to the mechanical stability of the insulating glass unit and absorbs part of the climatic loads that act on the edge seal.

Preferably, the secondary sealant polymers or silane-modified polymers, more preferably organic polysulfides, silicones, room temperature vulcanizing (RTV) silicone rubber, peroxidischvernetzten silicone rubber and / or addition-crosslinked silicone rubber, polyurethanes and / or butyl rubber. These sealants have a particularly good stabilizing effect.

The cavity preferably contains a desiccant, preferably silica gels, molecular sieves, CaCl 2, Na 2 SO 4, activated carbon, silicates, bentonites, zeolites and / or mixtures thereof.

In a further preferred embodiment of the insulating glass unit according to the invention, the capillary tube has a first opening which is open to the atmosphere and a second opening which is arranged in the cavity of the hollow profile strip. The capillary tube extends at least within the first Einsteckschenkels and in the corner area. Since the capillary tube opens into the hollow space of the hollow profiled strip and establishes a connection to the atmosphere, a pressure compensation can take place between inner space between the panes and the atmosphere. In the permeable portion of the glazing interior surface, a connection between the cavity and the inner space between the panes is established. The permeable portion is connected to the portion of the hollow profile strip into which the capillary opens, or it is itself a permeable portion. This makes it easy to install an insulating glass unit with pressure Equally produce by a connection between the cavity and the atmosphere is made. Since the capillary tube is integrated in the corner connector, it is optimally protected against bending during installation and also during the lifetime of the insulating glass unit.

In a preferred embodiment of the insulating glass unit according to the invention, only 40% to 0.5%, preferably 25% to 1%, particularly preferably 15% to 1% of the length s (relative to a stretched shape) of the capillary tube is arranged outside the spacer frame. Outside the spacer frame means in the outer space between the panes and in the environment of the insulating glass unit. The largest part of the capillary tube is arranged in this arrangement within the cavity of the hollow profile strip. Compared to arrangements in which more than 50% of the length of the capillary tube extend outside the spacer frame, the capillary tube within the spacer frame is optimally protected against external influences such as mechanical stress. So occur less damage to the capillary tube during assembly of the insulating glass unit. The sealing of the insulating glass unit with secondary sealing means can then be carried out automatically, since most of the sensitive capillary tube is located inside the hollow profiled strip and thus does not disturb the filling of the outer space between the panes.

In a preferred embodiment of the insulating glass unit according to the invention, the second opening of the capillary tube is arranged in a section of the hollow profiled strip with an impermeable glazing interior wall, this impermeable section being connected to a permeable section. Thus, the ambient air flowing in through the capillary tube does not get directly into the inner space between the panes, but first enters the impermeable section. Preferably, the impermeable portion is at least partially filled with a desiccant, so that the incoming air can first be pre-dried before it passes in the connected gas-permeable portion in the inner space between the panes. Particularly preferably, the gas flow is interrupted by the spacer frame or the hollow profile in the region of the corner connector. This interruption can be introduced for example by a corner connector according to the invention, which does not allow gas exchange between the connected ends of the hollow profile strip. Alternatively, a partition can be inserted into the hollow profile strip or a gas-impermeable rubber stopper. The interruption of the gas flow ensures that the ambient air flowing in through the capillary tube flows only in one direction and thus always first through the same sections, preferably filled with desiccant. This can further increase the efficiency of drying. The length d of the impermeable portion measured along the circumferential spacer frame is preferably at least 0.2 U, where U is the circumference of the spacer frame along the interior glazing wall. Preferably, d> 0.3 U, particularly preferably d> 0.5 U. This increases the drying path of the air stream in the gas-impermeable region, so that long-term stability, insulating effect and lifetime of the glazing are further optimized.

Preferably, all sections of the hollow profile strip are filled with a desiccant, so that a maximum drying of the incoming ambient air and the inner space between the panes are guaranteed.

In an alternative preferred embodiment, at least the portion of the hollow profile strip, in which the second opening of the capillary tube is arranged, is free of desiccant. This prevents clogging of the capillary tube with desiccant and precludes damage to the capillary tube during desiccant loading. The filling of about 25% of the hollow profile strip with desiccant is sufficient to ensure a dehumidification of the inner space between the panes. Preferably, at least 30%, more preferably at least 50% of the hollow profile strip is filled with desiccant in order to increase the drying capacity.

In a preferred embodiment of the insulating glass unit, the insulating glass unit includes a corner connector according to the invention, as described above.

The first and second pane of the insulating glass unit preferably contain glass and / or polymers, preferably flat glass, float glass, quartz glass, borosilicate glass, soda-lime glass,

Polymethylmethacrylate and / or mixtures thereof. In an alternative embodiment, the first pane and / or the second pane may be formed as a laminated glass pane.

The insulating glass unit can also contain more than two panes.

The invention further comprises a method for producing an insulating glass unit according to the invention, wherein initially a hollow profile strip is provided and this is connected to at least one corner connector according to the invention to form a complete spacer frame. In the case of an interrupted hollow profile strip, the individual sections can be provided with edge connectors according to the prior art without integrated capillaries. to be bound. Subsequently, at least a portion of the hollow profile strip is filled with a desiccant. A first section, into which the capillary tube opens, is not filled with desiccant. Thereafter, the first and second disks are attached to the spacer frame via a primary sealant to form an inner disk space and an outer space between the disks. In the final step, a secondary sealant is placed in the outer space between the panes and the pan assembly is compressed. The method according to the invention for producing an insulating glass unit with pressure compensation is considerably simpler than the prior art methods of integrating capillary tubes. There is no need for a separate step for the installation of the capillary tube. It must also be made no holes, since the installation of the capillary tube is done with the corner connector.

The invention further includes the use of the insulating glass unit according to the invention as building interior glazing, building exterior glazing and / or facade glazing.

In the following the invention will be explained in more detail with reference to figures. The figures are purely schematic representations and not to scale. They do not limit the invention in any way. Show it:

FIG. 1 a shows a schematic, perspective view of an embodiment of the corner connector according to the invention,

FIG. 1 b shows a schematic cross section of the corner connector according to the invention from FIG. 1 a,

FIGS. 2 a, 2 b and 2 c each show a schematic cross section of an embodiment of the corner connector according to the invention,

FIG. 3 shows a cross-section of a spacer frame with a corner connector according to the invention,

FIG. 4 shows the corner region of an insulating glass unit according to the invention in cross section,

FIG. 5 shows a perspective cross section of a hollow profiled strip 1,

FIG. 6 shows a cross-section of a section of an insulating glass unit according to the invention, Figure 7 shows a cross section of a spacer frame with inventive corner connector.

Figure 1 a, b shows a schematic representation of a corner connector according to the invention I. The illustration is greatly simplified. Slats or retaining elements, as used in the prior art, to fix the corner connectors in a hollow profile strip, for example, are not shown. These can be added by the specialist as needed. The corner connector I comprises a first Einsteckschenkel 31 and a second Einsteckschenkel 32, which are interconnected by the corner portion 34. The two Einsteckschenkel 31 and 32 include an angle α (alpha) of 90 °. The Einsteckschenkel 31 and 32 and the corner portion 34 are made in one piece in an injection molding of a polyamide. In the first Einsteckschenkel 31 and in the corner region 34 is a capillary tube 33 made of stainless steel integrated (cast). The capillary tube 33 is disposed inside the corner connector 34 and so well protected from external influences. The capillary tube 33 has a first opening 36 and a second opening 37. The capillary tube 33 enters the corner connector on the end face 35 of the first insertion leg 31, runs along the first insertion leg 31, is angled in the corner region 34 and enters the corner region 34, more precisely in the area of the corner surface 38, the corner connector I again. The corner surface 38 is the surface facing or at least partially in contact with the secondary sealant 16 in the finished insulating glass unit. The corner surface 38 is divided into two surfaces in this case. The side surfaces 39, however, are the surfaces of the corner portion 34, which point in the finished insulating glass unit to the outer panes, parallel to the outer panes of the insulating glass unit and optionally connected to these. The capillary 33 therefore exits again in the area of the corner surface 38, then passes through the secondary sealing means of the insulating glass unit and discharges into the atmosphere (see FIG. 4). The capillary tube 33 has already been integrated during the injection molding process, so that it is firmly anchored in the corner connector I. The capillary tube 33 has, for example, a length of 80 cm and an inner diameter of 0.6 mm. The length of the capillary tube is adjusted according to the dimensions of the insulating glass unit. The majority of the capillary tube 33 extends outside the first Einsteckschenkels 31. The dimensions of the corner connector depend on the hollow profile strips used. 1 The length L of a Einsteckschenkels is 3.0 cm in the example, and the length E of the corner region about 0.7 cm. The corner region 34 protrudes in comparison to the insertion legs 31 and 32, so that a hollow profile strip 1, which is pushed onto a Einsteckschenkel 31, 32 and abuts the corner region 34, flush with the corner region 34. This projecting corner region 34 additionally has the advantage that a reinforcement of the corner region 34 is thereby achieved, whereby is optimally protected by the capillary tube 33. The corner region 34 is rigid, that is, the angle □ (alpha) can not be changed significantly. As a result, the capillary 33 is optimally protected against bending in the corner region 34.

Figure 2a shows a schematic cross section of an embodiment of the inventive corner connector I. The corner connector shown differs from the corner connector shown in Figure 1 a, b in the corner 34. The corner portion 34 is compared to the Einsteckschenkeln 31 and 32 does not protrude and is therefore not additionally reinforced. As a result, the production of the corner connector I is simplified.

FIG. 2b shows a cross section of a further embodiment of the corner connector I according to the invention. The corner connector I shown differs from the corner connector shown in FIGS. 1a, b in the form of the capillary tube 33. The capillary tube 33 is wound in the form of a spiral. This variant is particularly suitable for smaller insulating glass units, since with less space required the same length capillary tube can be installed.

FIG. 2c shows a cross section of a further embodiment of the corner connector I according to the invention. The corner connector I shown differs from the corner connector shown in FIGS. 1a, b by the arrangement of the capillary tube 33 in the corner region 34. The capillary tube 33 is not angled, but extends straight through the first insertion angle 31 and the corner region 34 and exits in the area of the corner surface 38 again. This variant is easier to manufacture, since the capillary tube 33 does not have to be bent before the injection molding process.

FIG. 3 shows a cross section through a spacer frame 8 with a corner connector I according to the invention. The spacer frame 8 comprises four hollow profile strips 1. The shorter strips are each 100 cm long, while the longer strips are each 200 cm long. The four hollow profile strips 1 are connected by three corner connectors according to the prior art and a corner connector I according to the invention and form a rectangular spacer frame 8. A corner connector I according to the invention is described in FIG. The first Einsteckschenkel 31 and the second Einsteckschenkel 32 are each inserted into one of the hollow profile strips 1. The corner region 34 of the corner connector I is exposed, while the first Einsteckschenkel 31 and the second Einsteckschenkel 32 are each hidden in the hollow profile strip 1. The end faces 35 of the Einsteckschenkel 31 and 32 face the cavity 5 and are not on an inner sides of the hollow profile strip. The structure of a hollow profile strip 1 is shown by way of example in FIG. The hollow profile strip 1 contains a cavity 5. The cavity 5 is along three sides of the spacer frame 8 with a Trok- kenmittel 1 1, for example with Molsieb filled. The cavity 5 is in the finished insulating glass unit via perforations 7 in the glazing interior wall 3 of the hollow profile strip 1 in conjunction with the inner pane space 12. All glazing interior walls 3 are provided with perforations 7 and thus designed as permeable sections 1 a. The desiccant 1 1 can absorb moisture from the inner space between the panes 12 and prevent fogging of the discs. The section of the hollow profile strip 1, in which the second opening 37 of the capillary tube 33 is arranged, is not filled with a desiccant. Since this section is free of desiccant 1 1, the first opening 37 of the capillary tube is protected from clogging by dust from molecular sieve. In the finished insulating glass unit, a connection of the inner space between the panes 12 and the cavity 5 is ensured via the perforations 7 in the interior glazing wall 3. The second opening 36 of the capillary tube 33 opens into the atmosphere. The capillary tube 33 thus establishes a connection between the cavity 5 and the atmosphere and allows pressure equalization between the environment and the inner space between the panes 12. The capillary tube 33 has a total length of 80 cm. Of these, only about 7 cm, this corresponds to 9% of the total length, outside the spacer frame 8. The largest part of the capillary tube 33 is disposed within the cavity 5 of the first section 1 .1 of the hollow profile strip 5. Thus, the capillary tube 33 is optimally protected, both during installation of the spacer frame 8 in the insulating glass unit and during the entire life of the insulating glass unit.

Figure 4 shows a cross section through a section of an insulating glass unit according to the invention in the corner. The corner connector I according to the invention corresponds in its basic features to that shown in FIG. 1 and differs only in the shape of the capillary tube 33 in the corner region 34. The capillary tube 33 is bent in the corner region 34 at an angle of approximately 145 °, in contrast to an angle of approximately 90 ° In FIG. 1, the first insertion leg 31 and the second insertion leg 32 are each arranged within a hollow profile 1 or in a cavity 5 of the hollow profile. In this example, the capillary tube 33 opens into a filled with desiccant 1 1 section of the hollow profile strip. 1 The second opening 37 of the capillary tube 33 is located in the cavity 5 of the hollow profile strip 1. The glazing interior wall 3 of the hollow profile strip 1 is made gas-permeable, for example, made of a porous plastic, so that a gas exchange between the inner space between the panes and cavity 5 can take place. The outer wall 4 is provided with the use of a gas-permeable material for the hollow profile strip 1 with a barrier film 6, which improves the tightness of the edge bond. Adjacent to the outer wall 4 and the corner surface 38 of the corner connector I, a secondary sealing means 16 is arranged in the outer pane cavity 24, which improves the mechanical stability of the insulating glass unit. sert. The capillary tube 33 passes through the secondary sealant 16 so that the first opening 36 of the capillary tube 36 is open to the atmosphere. The secondary sealant 16 is, for example, an organic polysulfide.

FIG. 5 shows a perspective cross section of a hollow profiled strip 1. The hollow profile strip 1 comprises two parallel side walls 2.1 and 2.2, which make contact with the panes of an insulating glass unit. The side walls 2.1 and 2.2 are connected via an outer wall 4 and a glazing inner wall 3. The outer wall 4 extends substantially parallel to the glazing interior wall 3. The hollow profile strip 1 is made of a polymer and additionally glass fiber reinforced and contains, for example, styrene-acrylonitrile (SAN) and about 35 wt .-% glass fiber. The hollow profile strip 1 has a cavity 5 and the wall thickness of the polymeric hollow profile 1 is, for example, 1 mm. On the outer wall 4, a barrier film 6 is attached, which comprises at least one metal-containing barrier layer and a polymeric layer. The entire hollow profile strip has a thermal conductivity of less than 10 W / (m K) and a gas permeation of less than 0.001 g / (m ² h).

Figure 6 shows a cross-section of a section of an insulating glass unit according to the invention along the line A ¹ - A in Figure 4 (viewing direction is indicated in Figure 4.) The insulating glass unit II contains the hollow profile strip 1 described in Figure 5. Between a first disc 13 and a second The glass fiber-reinforced polymeric hollow profiled strip 1 with the barrier film 6 fastened thereon is arranged on the pane 14. The barrier film 6 is arranged on the outer wall 4 and on a part of the side walls 2.1 and 2.2 The first pane 13, the second pane 14 and the barrier film 6 delimit the pane The outer pane cavity 24 contains the secondary sealant 16, which contains polysulfide, for example, and the barrier film 6 together with the secondary sealant 16 isolates the inner pane space 12 and reduces the heat transfer from the glass fiber reinforced polymer hollow profile strip 1 in the inner space between the panes 12. The barrier film 6 can be fixed, for example, with a polyurethane (PUR) -Hotmeltkleber on the hollow profile strip 1. Between the side walls 2.1, 2.2 and the discs 13, 14, a primary sealing means 10 is preferably arranged. This contains, for example, a butyl. The primary sealant 10 overlaps with the barrier film 6 to prevent potential interfacial diffusion. The first disk 13 and the second disk 14 preferably have the same dimensions and thicknesses. The discs preferably have an optical transparency of> 85%. The disks 13, 14 preferably contain glass and / or polymers, preferably flat glass, float glass, quartz glass, borosilicate glass, soda lime glass, polymethyl methacrylate and / or mixtures thereof. In an alternative Embodiment, the first disc 13 and / or the second disc 14 may be formed as a laminated glass pane. The insulating glass unit II according to the invention forms in this case a triple or quadruple glazing. Within the hollow profile strip 1, a desiccant 1 1, for example Molsieb, within the hollow chamber 5 is arranged. This desiccant 1 1 can be filled into the hollow chamber 5 of the hollow profile strip 1 prior to assembly of the insulating glass unit. The glazing interior wall 3 comprises smaller perforations 7 or pores, which allow a gas exchange with the inner space between the panes 12.

FIG. 7 shows a cross-section of a spacer frame 8 with a corner connector I according to the invention. The spacer frame 8 comprises a hollow profile 1, which is bent into a rectangular frame. The two ends of the hollow profile 1 are connected via the corner connector I according to the invention. The first Einsteckschenkel 31 is inserted into a portion 1 b with impermeable glazing inner wall of the hollow section 1 and the second Einsteckschenkel 32 is inserted into a portion 1 a with permeable glazing inner wall 3. The hollow profile strip 1 is filled over the entire length with a desiccant 1 1. The glazing interior wall 3 in the region of the sections 1 a is designed to be permeable to gas, ie there are perforations 7 mounted there, so that in the finished insulating glass unit, a gas exchange between the inner pane space 12 and the cavity 5 of the hollow section 1 can take place. The corner region 34 of the corner connector I according to the invention is solid, that is, it separates the sections connected by the corner connector I according to the invention from each other and prevents gas exchange between these two sections. In the finished insulating glass unit, the ambient air flows from the second opening 37 into the cavity 5 of a gas-impermeable portion 1 b and is pre-dried there by contact with the desiccant 1 1. Only in the region of the permeable section 1 a, the air can pass through the perforations 7 in the glazing interior wall 3 in the inner space between the panes. This achieves efficient drying of the ambient air. LIST OF REFERENCE NUMBERS

I corner connector

II insulating glass unit

1 hollow profile strip

1 a Section with permeable glazed interior wall / permeable section

I b Section with impermeable glazing interior wall / impermeable section

2.1 first side wall

2.2 second side wall

3 glazing interior wall

4 outer wall

5 cavity or hollow chamber

6 barrier film

7 perforations in the glazing interior wall

8 spacer frame

10 primary sealant

I I desiccant

12 inside pane space

13 first disc

14 second disc

16 secondary sealant

21 edge of the first disc

22 edge of the second disc

24 outer pane space

31 first Einsteckschenkel

32 second Einsteckschenkel

33 capillary

34 corner area

35 front side of a Einsteckschenkels

36 First opening of the capillary

37 second opening of the capillary

38 Corner area of the corner area

39 side surface of the corner area

L Length of a Einsteckschenkels

E length of the corner area

s to be installed length of the capillary tube in stretched form

b to be installed length of the capillary tube in bent or wound form

Claims

claims

1 . Corner connector (I) for connecting two hollow profile strips in insulating glass units, at least comprising

a first Einsteckschenkel (31), a second Einsteckschenkel (32), a corner region (34) and a capillary tube (33) having a first opening (36) and a second opening (37), wherein

the corner region (34) the second Einsteckschenkel (32) with the first

Einsteckschenkel (31) connects,

the two Einsteckschenkel (31, 32) enclose an angle α, with 45 ° <a <180 °, the first Einsteckschenkel (31), the second Einsteckschenkel (32) and the

Corner area (34) are injection-molded,

the capillary tube (33) is firmly cast at least in the corner region (34) and the capillary tube (33) in an insulating glass unit (II) establishes a connection between the inner space between the panes (12) and the surroundings.

2. corner connector (I) according to claim 1, wherein the capillary tube (33) is bent or wound at least in a partial area, so that the length to be installed b of the capillary tube (33) in curved or tortuous shape is shorter than the length to be installed s the capillary tube (33) in an elongated form.

3. corner connector (I) according to claim 2, wherein for the ratio of the length to be installed b of the capillary tube in a curved or tortuous shape to the length s of the capillary in an elongated form, b / s is: 0.05 <b / s <0, 55, preferably 0.1 <b / s <0.35.

4. corner connector (I) according to one of claims 1 to 3, wherein the capillary tube (33) on an end face (35) of the first Einsteckschenkels (31) protrudes from the corner connector (I) is disposed within at least the first Einsteckschenkels (31) and protrudes from the corner region (34) of the corner connector (I).

5. corner connector (I) according to one of claims 1 to 4, wherein the first Einsteckschenkel (31) and the second Einsteckschenkel (32) form a right angle.

6. Corner connector according to claim 5, wherein a first opening (36) of the capillary tube (33) at the em from the corner region (34) protruding end is reversibly closed, preferably with a rubber cap is closed.

7. corner connector according to one of claims 1 to 6, wherein the capillary tube (33) made of a metal, preferably made of stainless steel or aluminum.

8. Insulating glass unit (II) at least comprising

a first disc (13), a second disc (14),

a spacer frame (8) arranged between the panes (13, 14), comprising at least one hollow profiled strip (1) and a corner joint (I),

an inner disc space (12) delimited by the first disc (13), the second disc (14) and the spacer frame (8),

wherein the corner connector (I) at least one first Einsteckschenkel (31), a second Einsteckschenkel (32) which is connected in the corner region (34) with the first Einsteckschenkel (31), and at least in the corner region (34) integrated capillary tube (33) comprising, wherein the first Einsteckschenkel (31), the second Einsteckschenkel (32) and the corner region (34) are injection-molded,

wherein the first Einsteckschenkel (31) and the second Einsteckschenkel (32) are respectively inserted into one end of the at least one hollow profile strip (1) and

the capillary tube (33) establishes a connection between the inner space between the panes (12) and the atmosphere.

9. insulating glass unit (II) according to claim 8, wherein the hollow profile strip (1) at least a first side wall (2.1); a second side wall (2.2) arranged parallel thereto; a vertical glazing interior wall (3) arranged perpendicular to the side walls (2.1, 2.2) connecting the side walls (2.1, 2.2) with each other; an outer wall (4) arranged substantially parallel to the glazing inner wall (3) connecting the side walls (2.1, 2.2) and a cavity (5) defined by the side walls (2.1, 2.2), the glazing inner wall (3) and the outer wall (4) is enclosed comprises, wherein the glazing inner wall (3) at least one permeable portion (1 a) contains and

the cavity (5) at least in the permeable section (1 a) contains a desiccant (1 1).

Insulating glass unit (II) according to claim 9, wherein the capillary tube (33) has a first opening (36) which is open to the atmosphere and has a second opening (37) formed in the cavity (5). the hollow profile strip (1) is arranged, and the capillary tube (33) at least within the first Einsteckschenkels (31) and in the corner region (34) is arranged.

1 1. Insulating glass unit (II) according to claim 9 or 10, wherein 40% to 0.5%, preferably 25% to 1%, particularly preferably 15% to 1% of the length s of the capillary tube (33) outside the spacer frame (8) are arranged.

12. insulating glass unit (II) according to any one of claims 10 to 1 1, wherein

the second opening (37) of the capillary tube (33) is arranged in a section (1 b) of the hollow profiled strip (1) with impermeable glazing interior wall (3) and the impermeable section (1 b) with a permeable one Section (1 a) is connected.

13. insulating glass unit (II) according to claim 8 wherein the corner connector (I) is a corner connector according to one of claims 1 to 7.

14. A process for producing an insulating glass unit (II) comprising at least the steps:

Provision of a hollow profiled strip (1),

Connecting the hollow profiled strip (1) to a complete spacer frame (8) by means of at least one corner connector (I) according to one of claims 1 to 7,

Filling the hollow profile strip (1) with a desiccant (1 1),

Attaching a first disc (13) and a second disc (14) to the spacer frame (8) via a primary sealant (10), wherein an inner disc space (12) and an outer space between discs (24) are formed,

Attaching a secondary sealant (16) in the outer space between the panes

(24).

14. Use of the insulating glass unit (II) according to one of claims 8 to 13 as building interior glazing, building exterior glazing and / or facade glazing.