EP1555375A1 - Composite profile - Google Patents

Abstract

The section has two parts made from different material. A connection part (40, 41) is made from a third material for connecting the two parts together so that the composite section covers a first length in a longitudinal direction. The two profile parts are also connected to a partial connecting part. The partial connecting part allows other parts to connect to it. Recesses form closure elements and made from hardened connecting mass (50).

Description

The present invention relates to a composite profile, and more particularly to a composite profile for window, door and façade elements.

Composite profiles for window, door and facade elements of the type in question have two profile parts, an outer profile and an inner profile, by one or more as insulating trained connecting parts are connected to each other, on. 90% of today conventional composite profiles are made of aluminum, the connection of the profile parts and the insulating elements is made by curling, as for example in the DE 1 101 734 is described.

Fig. 7 shows an example of such a composite profile using the example of window elements. An insulating glass pane 63 is held between seals 61, 62 in a window frame, which is formed of composite profiles. A composite profile has a profile part 200 (inner profile), the two formed as connecting parts insulating 400, 500 with a further profile part 300 (outer profile) is connected, on. At the profile part 200 is another Profile part 60 is fixed, the above the seals 61, 62, the insulating glass pane 63 on the the parts 200, 300, 400, 500 formed composite profile holds. The building side of the building Window frame is made of a further composite profile of the profile parts 700, 800, the are formed via the connecting elements formed as insulating 900, 900 formed. Seals 65, 640 seal the gap between the two composite profiles from. In Fig. 7 is the example of the connection of the profile part 300 with the connecting part 500 shown a rolled-up connection. The profile part 300 is like the profile parts 200, 700, 800 made of aluminum. A cross-sectionally dovetail-shaped connector connection area 501 is by positive engagement in a dovetailed cross-section Groove, which is formed by the connecting portion 301, 302. The one Side wall 301 of the tread connection area becomes after insertion of the connection part connection area 501 in the at that time not yet dovetailed Groove pushed towards the other wall 302 by curling, as for example in the DE 1 101 734 is described.

However, the composite profiles produced by this connection method meet with their Limits when it comes to achieving better thermal values and / or different or other materials such as wood, plastic, steel in addition to or as an alternative to aluminum to use for the inner profile parts and the outer profile parts.

The curling requires a profile design, in which only about 50% of the overall depth of the composite profile can be formed by the insulating elements. That reduces at the same Construction depth of the composite profile the achievable thermal values.

The wall thicknesses must be for inner profile parts and outer profile parts made of aluminum for a safe rolling process be greater than is necessary for the static strength. The means that about 2 mm wall thickness is needed for a safe curling while about 1.5 mm to achieve the static strength would be sufficient.

If the depth of the insulating chosen to achieve good thermal values large is, the depth of the composite profile grows strong. The result is that, for example, windows can no longer be opened with turn-tilt fittings with small joining widths.

Large depths in such composite profiles also require greater tolerances in the Overall depth. The main reasons are that with plastic insulating elements, the manufacturing tolerances are given and that even after the production of dimensional changes by post-crystallization and / or moisture absorption and / or moisture release or similar occur.

In the prior art, there are some approaches, individual features of such composite profile to improve, which are exemplified below. From EP 0 103 272 A2 a foaming known. From DE 1 260 105 a bonded composite profile is known. From DE 75 22 009 U a composite profile is known in which the profile parts in recesses snap a profile strip and the fuse by a hardenable adhesive should be done. DE-OS 2 033 442, DE-OS 27 12 956, DE 34 23 712 Al and US 3,393,487 each composite profiles are known which at a curable plastic Use compound profiles. From DE 100 33 861 Al a composite profile is known, in the inserted the insulating profile in the longitudinal direction and then with a curable plastic is connected.

All of these approaches have a problem that with prolonged use a loss the shear strength occurs in the longitudinal direction. So far, only the rolled-in composite described above, in which provided a good knurling on the inside on the aluminum profile part is, sufficient shear resistance even in continuous use. The others described Composite profiles with foaming, gluing, clipped composite profiles or the Use of thermosetting plastics all fail in continuous use due to a Aging of the foamed materials, the bonds, the casting resin, etc., resulting in a Loss of shear strength in the longitudinal direction leads.

It is therefore an object of the invention, the described disadvantages of the composite profiles at least partially overcome.

This object is achieved by a composite profile according to claim 1.

Further developments of the invention are specified in the dependent claims.

In the composite profile, the shear strength in the longitudinal direction of the composite profile also in case of aging-related failure of the adhesion between the hardened bonding compound and the profile parts and / or the connecting part ensured by that on the cured compound a positive connection between positive locking elements such the first and second retaining elements is made and remains. This positive connection exists in all directions and not just in the longitudinal direction. Since no more curling necessary is, all materials such as aluminum, wood, plastic, steel in any combination be used for the profile parts. In addition, there are constructive limitations that were required by the curling away, so that both the proportion of profile parts on the Bautiefe the composite profile can be reduced as well as the arrangement of the profile part connection areas and the connector connection areas without the geometric limitations, which are forced by curling, are possible.

Fig. 1

eine Querschnittsansicht senkrecht zur Längsrichtung eines Fensterrahmens, der zwei Verbundprofile nach Ausführungsformen der Erfindung aufweist;

Fig. 2

in Ansicht a) die Ansicht aus Fig. 1, und in den Ansichten b) und c) vergrößerte Teilansichten von Details, die in Ansicht a) durch Umrandung markiert sind, in einer Abfolge von Schritten der Montage und dem Endzustand;

Fig. 3

schematisch in den Ansichten a) bis c) die Montage des in Fig. 1 auf der rechten Seite gezeigten Verbundprofils;

Fig. 4

eine Modifikation der Ausführungsform aus Fig. 1 in Ansichten, die den Ansichten aus Fig. 2 entsprechen;

Fig. 5

eine weitere Modifikation der Ausführungsform aus Fig. 1 in Ansichten, die den Ansichten aus Fig. 2 entsprechen;

Fig. 6

eine weitere Modifikation der Ausführungsform aus Fig. 1, wobei die Ansichten in a) und b) den Ansichten aus Fig. 2 b) und c) entsprechen, und Ansicht c) ein noch nicht gebogenes Blech mit Rändelung zeigt; und

Fig. 7

einen Fensterrahmen mit Verbundprofilen nach dem Stand der Technik.

Further advantages and expediencies will become apparent from the description of embodiments with reference to FIGS. From the figures show:

Fig. 1

a cross-sectional view perpendicular to the longitudinal direction of a window frame having two composite profiles according to embodiments of the invention;

Fig. 2

in view a) the view of Fig. 1, and in the views b) and c) enlarged partial views of details which are marked by border in view a), in a sequence of steps of assembly and the final state;

Fig. 3

schematically in the views a) to c) the assembly of the composite profile shown in Figure 1 on the right side.

Fig. 4

a modification of the embodiment of Figure 1 in views corresponding to the views of Figure 2 ..;

Fig. 5

a further modification of the embodiment of Figure 1 in views corresponding to the views of Figure 2 ..;

Fig. 6

a further modification of the embodiment of Figure 1, wherein the views in a) and b) correspond to the views of Figure 2 b) and c), and view c) shows a not yet bent plate with knurling; and

Fig. 7

a window frame with composite profiles according to the prior art.

Fig. 1 shows a window frame with composite profiles according to embodiments of the invention. The composite profiles extend in their longitudinal direction perpendicular to the paper plane from Fig. 1. The window frame has two composite profiles. A first composite profile has a first profile part 20 (inner profile) and a second profile part 30 (outer profile). The first Profile part 20 is formed by an insulating member formed as a connecting part 40 with the second Profile part 30 connected. The connection of the first profile part and the second profile part with the connecting element is by a cured compound compound 50 as a cured cast resin or the like in a manner described in detail below produced. Thus, the parts 20, 30, 40 form a composite profile 10. On the composite profile 10th another profile part 60 is fixed in such a way that an insulating glass pane 63 between seals 61, 62 is held on this composite profile 10. The unit thus formed forms the moving part of a window frame.

The building-side part of the window frame is formed by a composite profile 11, the from a first profile part 11 and a second profile part 21, via a connecting part 41 trained insulating element are connected. The space between the two Composite profiles is through the seals 64, 65 in the closed state of the window sealed. The connection of the parts 21, 31 and 41 will again be described later Way prepared by a curable bonding compound 50.

The direction x shown in Fig. 1, i. the direction in which the first profile part 20 and the second profile part 30 are opposite, is referred to below as the transverse direction. The Construction depth of the composite profiles designates the construction depth in the transverse direction. The direction vertical to the transverse direction and perpendicular to the longitudinal direction is hereinafter referred to as horizontal direction y (from left to right in Fig.1). The definitions of the longitudinal direction, the Transverse direction and horizontal direction apply to all figures and the description all embodiments and modifications.

In Fig. 2, the view from Fig. 1 is shown in view a), and in view b) is an enlarged Partial view of a detail, which is marked by border in view a), in a sequence of steps of assembly and the final state shown, and in view c) is the enlarged Partial view of the other bordered detail shown in view a).

The first profile part 20 has a first profile part connection area, which in Fig. 2a) in the border is shown. This first profile part connection region extends over at least a portion of the length of the first profile part 20 in the longitudinal direction, preferably over the entire length of the first profile part. The first profile part connection area becomes formed by a Fügeeausnehmung 22, of two longitudinally extending Walls 23, 24 is limited. In the embodiment shown in Fig. 1 is one of the two Walls, namely the wall 24, freestanding. The volume of the joining recess 22 corresponds the volume up to a line in the horizontal direction the upper edge of the freestanding Wall 24 touched.

On one of the two walls 23, 24 are first positive locking elements as holding elements 25 in Form formed by tooth-like projections. In the embodiment shown in Fig. 2 three longitudinally arranged rows of projections are provided. The majority of projections has in the longitudinal direction at a distance from each other.

The second profile part connection area, not shown in detail in FIG. 2, of the first profile part 20 is constructed in a similar manner, wherein in this both the joining recess limiting Walls are freestanding. Whether and how many walls are detached from the joining recess, i.e. projecting towards the profile part, should be formed later in the Discussed in connection with a holding device.

The connection part 40 has a connection part connection portion, which is of a Joining projection 47 is formed. The joining projection is referred to as a projection, since it is in the joining recess is to be introduced for connecting the profile part and the connecting part, i.e. must project from the connecting part at least to the extent that such an insertion is possible. On one side of the joining projection 47 positive locking elements are the second Holding elements 45 formed in the form of protrusions. In the embodiment shown in Fig. 2 are again three longitudinally arranged rows of projections, which in Longitudinally spaced from each other, provided.

In the assembled state (the illustration on the far right in view c)) is the joining projection 47 inserted into the Fügeausnehmung 22, the first and second formed as projections Retaining elements 25, 45 face each other and overlap seen in the longitudinal direction not, and the joining recess and the space between the first holding elements 25 having wall 23 and the second holding elements 45 having joining projection 47 is with the cured bonding compound 50, before insertion into the Fügeausnehmung 22 was filled in uncured state, filled.

Due to the longitudinally extending through the spaced-apart projections consists Positive locking between the first and second holding elements (projections) 25, 45 and the cured bonding compound 50. This ensures the shear strength in the longitudinal direction, regardless of whether the adhesion between the first profile part 20 and the Joining compound 50 and / or between the connecting part 40 and the connecting mass 50 persists or not.

The shear strength in the transverse direction and in the horizontal direction is also obvious by this positive engagement between the projections 25, 45 and the connecting compound 50th ensured, and also regardless of the existence of adhesion of the bonding compound 50 on the first or second profile part 20, 30 and the connecting part 40th

In the embodiment shown in Figs. 1 and 2, the connection part connecting portion in addition, extending in the longitudinal direction parallel to the joining projection 47 Wall 48, through which between the joining projection 47 and the additional wall 48 a Interspace 49 is formed. The width of the gap 49 is sized so that he is minimally smaller than or equal to the width of the freestanding wall 24. If the Joining projection 47 is now inserted into the joining recess 22, the freestanding Wall introduced into the space 49, which only happen by applying a force can, the gap 49 against the elasticity of the joint projection 47 and the additional Wall 48 turns up. This results after the joining projection 47 to the desired Dimension is introduced into the joining recess 22, a holding force by the friction between the free-standing wall 24, the joining projection 47 and the additional wall 48, the relative positioning between the first profile part 20 and the connecting part 40 independently from the curing of the bonding compound 50 holds, if no greater force than this Holding force counteracts. In this embodiment, therefore, form the freestanding Wall 24, the joining projection 47 and the additional wall 48 a holding device. from that also shows that in the event that a holding device, clamped in the wall is, should be provided, at least one free-standing wall must be present.

As can be seen from the alternative in FIG. 5, however, such a holding device is not mandatory. Until curing of the bonding compound, the relative positioning the components are also held by other means.

The second profile part 30 has a profile part connection area, which in view b) in shown in greater detail. This profile part connection region has a joining projection 37, on the interlocking elements as a second holding elements 35 in the form of projections are provided in the same manner as on the joining projection 49. The connecting part 40 has another connection part connection area, which in view b) also in Detail is shown. This connection part connection region has a joining recess 42 on, in a similar manner as the joining recess 22 by two in the longitudinal direction extending walls 43, 44 is limited. On one wall 44 are positive locking elements as first holding elements in the form of projections 45 in the same way as the projections 25 provided. The positive connection between the second profile part 30 and the connecting part 40 is in the same way as they are with respect to the positive connection between the first profile part 20 and the connecting part 40 after curing the connecting compound 50 made.

A holding device is in the detail shown in view b) by the freestanding Wall 34, which is formed parallel to the joining projection 37, and another free-standing Wall 46, which is formed parallel to the wall 44 outside of the joining recess 42 is formed. The walls 44, 46 form a gap 49 whose width is minimally smaller than which is equal to or equal to the thickness of the freestanding wall 34, so that analogous to the previously described Retaining a holding force between these walls after insertion of the joining projection 37 is obtained in the joining recess 32.

The holding device in the first embodiment shown in FIGS. 1 and 2 thus consists of a freestanding wall on one component, and two parallel walls on one second component having a distance that is slightly smaller than or equal to to the thickness of the other freestanding wall, so that after insertion of the other freestanding wall in this space a holding force is obtained by the friction. Of course, these walls must be positioned so that the freestanding wall into the space is introduced when the joining projection inserted into the Fügeeausnehmung is or will be.

In the embodiment shown in FIGS. 1 and 2, the connection part has four connection part connection areas on. Each two connection parts connection areas are the associated with the first profile part 20 and the second profile part 30. The two profile parts have corresponding to two profile part connection areas, so that a total of four Verbindungsbereichspaare available. In the embodiment shown in FIGS. 1 and 2 is to notice that the connection areas are not necessarily in one plane in the horizontal Direction lie (see the connection areas between the first profile part 20th and connector 40).

Furthermore, it should be noted that the proportion of the connection part 40, i. of the insulating element, at the depth is much larger than in the prior art. This becomes possible because the Construction no longer the high, occurring during rolling forces, etc. must take.

The problems of dimensional stability in the transverse direction can also be achieved in a very simple way be solved that the joining projections to the desired extent in the Fügeeausnehmungen be introduced. The components are then in this desired level in Transverse direction either by an external holding device or by those described above integrated holding devices held until the bonding compound 50 is cured. As a result, the manufacturing tolerances of the components can be compensated, for example due to the production on different machines, from slightly different materials, the Nachkristallisation, water absorption, water, etc. always present. It Thus, therefore, a plurality of composite profiles 10, 11 can be produced which are independent from these tolerances of the starting materials always the same measure in the transverse direction (= Construction depth).

The problems described at the beginning of the composite profiles produced by a rolling-in process Thus, all can be solved without the disadvantages of the alternative solutions described above einzuhandeln. In particular, more than 50% of the overall depth of the composite profile be provided with the insulating, the wall thickness can be reduced, any Materials for the inner profile parts and the outer profile parts are combined and good thermal values are achieved without increasing the depth, and at the same time at overcome the existing aluminum profiles existing problem of Bautiefentoleranz become. At the same time any failure of the shear strength in the longitudinal direction by Age-related failure of the adhesion of the connecting material with the materials of the profile parts and the connecting part excluded.

In addition, for example, 5-head solutions, as shown in Fig. 1 and 2 for the composite profile 11 are shown to be easily possible, which have been impossible with the rolling-in method would.

The joining recess serves as a reservoir for the uncured compound. It should only be ensured that the filled volume of the compound does not exceed the volume of the joining recess. Preferably, the volume is the filled compound below the volume, after deduction of the volume the volume of the inserted joining projection still remains in the joining recess (see Fig. 2b), right figure). But at least the volume is below the volume, the between the inserted joining projection and the opposite wall of the joining recess remains (see Fig. 2c), right figure).

Another advantage of the embodiment shown in Figs. 1 and 2 is that the joining the components are transversely, i. e. that no pushing in as well any kind of projections, components, dovetails, fasteners or similar must be done in the longitudinal direction of the composite profiles, as this in conventional Solutions with curling and many other conventional solutions is the case. This is solved another tolerance problem.

As materials for the profile parts 20, 21, 30, 31 all materials can be freely selected, e.g. Wood, steel, plastic, aluminum. It can e.g. weather-resistant for the outer profile Materials and for the inner profile more selected by appearance materials be used. The insulating elements selected as connecting part are made of a good heat-insulating plastic, e.g. Polyamide or PET formed.

The curable bonding compound may be a cast resin such as PUR, PIR or an epoxy resin system be.

The resin should preferably be powder-coatable, i. a temperature of 200 to 220 ° C survive for 20 to 30 minutes and / or it should preferably be resistant to cleaning baths be as they are used in anodizing.

Preferably, at least the visible surfaces of the connector 40 are conductive such that the resistance is less than 10 ^-9 Ω. This serves to allow the materials to be coated. This conductivity is achieved either with an applied conductive primer and / or by introducing a conductive material into the insulating element.

In Fig. 3, a method for producing the composite profile is shown schematically. First the first profile part 20 and the second profile part 30 and the connecting part 40 are provided. Then the joining recesses with a predetermined volume of curable bonding compound 50, e.g. via filling nozzles 102 of a corresponding Filling machine 101 (see Fig. 3a)). Subsequently, in the transverse direction, the joining projections introduced into the Fügeeausnehmungen (see Fig. 3b)). When shown in Fig. 3 Embodiment of the composite profile, the described holding devices are provided, so that after insertion, holding the components on the desired in the transverse direction Dimension (= depth) can be done without the use of an external holding device.

FIG. 4 is a modification of the embodiments shown in FIGS. 1 and 2. Of the The only difference is that the holding devices are designed differently. at the modification shown in Fig. 4 are the spaces 49 in the holding means so formed so that they are in the direction of the opening in cross-section perpendicular to the longitudinal direction rejuvenate. On the gap facing inner sides of the walls 44, 46 and 47, 48 are knurls or rasters 46r, 48r formed. On the in the spaces between freestanding walls to be inserted are corresponding knurls or grids, which are not shown formed. When inserting the space is now against the elastic force of the bounding walls bent up and the grids engage in the Endposition into each other, so that the holding force not only by the elastic force of the walls and the resulting friction, but in particular by the intermeshing Screening or knurling is applied. As a result, the holding force can be essential be increased and keeping it safer.

FIG. 5 shows a further modification of the embodiments shown in FIGS. 1 and 2. The modification shown in Fig. 5 differs in that no holding devices are provided. In the embodiment shown in Fig. 5 it would still be possible to omit the freestanding wall 34 (see Fig. 5b)).

In Fig. 6, a further modification is shown. The first and second retaining elements are partially formed as knurling 25r, 45r. Even such knurling exists last End of protrusions and / or incisions and results in a suitable choice of the curable Joining compound the same effects and advantages as larger protrusions. The Profile parts 20 and 30 shown in FIG. 6 can be produced by bending a pre-knurled sheet, As shown in Fig. 6c, are produced in a simple manner.

Alternatively, the first and / or second holding elements, i. the projections and / or Incisions, also through reticular structures, screened structures, embossments, especially rough surface structures such as roughened wood, etc. are obtained.

In all embodiments described and shown in the figures, the orientation correspond the depth direction of the joining recess and the direction of protrusion of the Joining projection and the resulting direction of inserting the joining projection into the Fügeeausnehmung each of the transverse direction. Among other things, this is the tolerance compensation possible. The tolerance compensation is of course also possible for an orientation of the depth direction the joining recess and the direction of protrusion of the joining projection and the resulting direction of insertion of <± 90 ° relative to the transverse direction. But even with appropriate orientations and an insertion perpendicular to the transverse direction All advantages except tolerance compensation are obtained.

The first, second and third materials of the claims can be freely chosen and are not limited to a single material. For example, the third material have multiple materials, i. the connecting part may e.g. partly made of polyamide and partly made of PU foam, and / or the first profile part (first material) may be partially made of plastic and partially made of wood and / or the second Profile part (second material) may be formed partly of metal and partly of plastic be.

It is expressly stated that all features described in the description and / or the claims are disclosed for the purpose of original disclosure as well as Purposes of limiting the claimed invention independently of the compilation the features in the embodiments and / or the claims separately and independently should be disclosed from each other. It is expressly stated that all areas of Values or specified groups of objects any intermediate value or any item from the group for the purpose of the original revelation as well as for the purpose of limiting the claimed invention, also as a range limit, reveal.

Claims (10)

Composite profile, in particular for window, door and facade elements, with
a first profile part (20, 21) made of a first material,
a second profile part (30, 31) made of a second material, and
a connecting part (40, 41) of a third material for connecting the first profile part and the second profile part such that the composite profile (10, 11) extends in a longitudinal direction over a first length,
wherein at least one of the first and second profile parts (20, 21, 30, 31) has at least one tread connection region (22, 37) and the connection part (40, 41) has at least one connection part connection region (42, 47) connected to the tread connection region (22, 37 ),
characterized in that the tread part connection portion or the connection part connection part has a joining recess (22, 42) extending longitudinally over at least a part of the first length, and the corresponding other tread part connection part or connection part connection part has a joining projection (37, 47) shown in Figs the joining recess (22, 42) is inserted,
in that the joining recess has a plurality of positive-locking elements (25, 45, 25r), that the joining projection has a plurality of positive-locking elements (35, 45, 35r), and that the positive-locking elements (25, 45, 25r, 35, 45, 35r) pass through a cured bonding compound (50), which is located in the Fügeausnehmung, are positively connected. Composite profile according to claim 1, in which
the joining recess has a plurality of first holding elements (25, 45, 25r) as form-locking elements, which are arranged in the longitudinal direction and at a distance in the longitudinal direction and which protrude perpendicular to the longitudinal direction and / or are cut,
that the joining projection has a plurality of second holding elements (35, 45, 35r) as form-locking elements, which are arranged in the longitudinal direction and at a distance in the longitudinal direction and projecting perpendicular to the longitudinal direction and / or cut, and
in that the joining recess is filled with a hardened bonding compound (50) at least in the area in which the first and second retaining elements (25, 45, 25r, 35, 45, 35r) of the joining recess and the joining projection are located. Composite profile according to one of claims 1 or 2, in which
the first profile part and / or the second profile part each have at least two profile part connection areas and the connection part has a number of connection part connection areas corresponding to the total number of profile part connection areas,
wherein each one profiled part connecting portion and one connecting part connecting portion are assigned to each other as a connection area pair, and the profile part connection portion or the connection part connection portion comprises the joint recess (22, 42) and the corresponding other profile part connection portion or joint portion of the connection region pair has the joint projection (37, 47). Composite profile according to one of claims 1 to 3, wherein the joining recess and extend the joining projection over the first length. Composite profile according to one of claims 2 to 4, wherein the first Holding elements (25, 45, 25r) and second holding elements (35, 45, 35r) perpendicular to In each case extend longitudinally such that, seen in the longitudinal direction, the first Holding elements and the second holding elements do not overlap. Composite profile according to one of claims 1 to 5, in which
a holding device (24, 47, 48, 48r, 34, 44, 46, 46r) for holding the relative position of the first profile part (20) and the connecting part and / or the second profile part (30) and the connecting part (40) independently of the cured compound (50) is provided. Composite profile according to one of claims 1 to 6, in which
the joining recess is bounded on at least one side by a first wall (24, 44) which projects in relation to the corresponding profile part (20) or connecting part (40). Composite profile according to claim 7, in which
adjacent and parallel to the joining projection (47) over at least a part of the first length, a projecting second wall (48) is provided such that the first wall (24) is located between the joining projection and the second wall, and the first and second Wall and the joining projection a holding device (24, 47, 48, 48r) form, which holds the located between the joining projection and the second wall first wall with a holding force. Composite profile according to claim 7 or 8, wherein
adjacent to and parallel to the first wall (44) over at least a portion of the first length a projecting third wall (46) is provided and adjacent and parallel to the joining projection (37) a projecting fourth wall (34) is provided such that the fourth Wall (34) between the first wall (44) and the third wall (46) is located, and the first, third and fourth wall (44, 46, 34) a holding device (34, 44, 46, 46r) form, the holding the fourth wall located between the first wall and the third wall with a holding force. Composite profile according to one of claims 2 to 9, in which
the first and / or second holding elements are at least partially formed as knurling (25r, 35r).

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