EP4174272A1 - Composite profile - Google Patents

Abstract

The invention relates to a composite profile (100) for producing frames for windows or doors, comprising a plastic hollow profile (10), in particular made of polyvinyl chloride, with a plurality of hollow chambers (60), on the outside of the outer wall (20) of the plastic hollow profile (10), particularly that outer wall (20) which is weathered during intended use, an outer wall reinforcement (30), preferably made of metal, in particular aluminium, is fastened, in particular fastened shear-resistant by gluing, preferably on/in a fastening groove (21) of the outer wall (20 ), wherein on the inside of the inner wall (40) pointing towards the inside of the profile and/or on an inner web (41) of the plastic hollow profile (10) lying parallel to the inner wall and at a distance from it, in particular that inner wall (40) which, when used as intended, points to the interior of a building At least one inner reinforcement (50), preferably precisely one inner reinforcement (50) made of an aggregate-reinforced plastic is materially attached, preferably by coextrusion. The invention also relates to a frame for a window or a door.

Description

The invention relates to a composite profile for the production of frames for windows or doors, comprising a plastic hollow profile, in particular made of polyvinyl chloride, with several hollow chambers, with an outer wall reinforcement, preferably made of metal, in particular aluminum, is attached. In particular, the outer wall reinforcement is fastened in a shear-resistant manner, in particular by gluing. The outer wall reinforcement is preferably fastened to/in a fastening groove of the outer wall.

The invention also relates to a frame for a window or a door.

Plastic hollow profiles, in particular extruded plastic hollow profiles for the production of window frames, door frames or the like, are usually used to form blind frames that can be connected to a supporting structure and/or a casement frame that can be movably connected thereto and can also be provided with an outer wall reinforcement, e.g. by means of a shear-resistant connection .

Pure plastic hollow profiles, preferably made of polyvinyl chloride (PVC), optionally with one or more hollow chambers running parallel to the longitudinal direction of the plastic hollow profile, do not have sufficient strength and flexural rigidity for the production of frames, especially when heated, e.g. under solar radiation.

Plastic hollow profiles, eg made of PVC, are constructed in such a way that they can absorb or transfer compressive and tensile stresses as well as bending moments with limited deflection.

That is why a wide variety of paths have been taken with regard to the reinforcement of such plastic hollow profiles:
In order to achieve sufficient rigidity, steel profiles or synthetic resin-bonded glass fiber rods, for example, are subsequently pushed into the cavity of plastic hollow profiles as reinforcements.

Push-in reinforcements of the type mentioned are disadvantageous because of the lack of bonding with the plastic hollow profile. Metal reinforcements, e.g. steel reinforcements, are susceptible to corrosion despite the protective zinc layers at the screwing points. In addition, metal reinforcements cause considerable difficulties if you want to butt weld or miter weld the frame corners together on modern plastic precision welding machines during the manufacture of the frame. For this reason, subsequent insertable reinforcements are generally shorter than the plastic hollow profile into which they are to be inserted and stand back in the corners.

Another problem in the processing of such profiles is that the reinforcements in the formation of corner areas cannot be welded like the profile itself, but either have to remain without a connection or corner connections have to be made with a separate technology using complex corner connection elements.

In order to produce a high static load-bearing capacity of plastic hollow profiles, e.g. made of PVC, in particular with wing profiles, it is state of the art to use so-called reinforcements with a higher load-bearing capacity or higher modulus of elasticity than the pure plastic material.

Such reinforcements are made of metal and are usually made of steel or aluminum. In addition to a high load-bearing capacity, they also have high thermal conductivity. However, this has increasingly negative effects in relation to the increasing demands on the thermal insulation of plastic hollow profiles in frame construction and alternative materials are being used Reinforcement of the plastic hollow profiles sought, which, in addition to a high load-bearing capacity, have the lowest possible thermal conductivity.

In order to be able to use a higher modulus of elasticity is from the patent application DE 10 2004 002 397 A1 known to glue an aluminum shell on a plastic hollow profile on both the weather and room side.

The disadvantage of this construction is the mandatory aluminum paneling on both sides to ensure the static balance of the window. The high proportion of aluminum is expensive compared to PVC and does not use the advantages of a plastic window in terms of appearance and care.

Aluminum facings of the aforementioned type are therefore often undesirable on the visible surface facing the room or on the inner wall of a window or door frame.

But even with a construction according to this state of the art, sufficient load introduction and load absorption of glass loads is only given to a limited extent.

The object of the invention is therefore to overcome the disadvantages of the prior art and to provide a frame profile for the construction of frames for windows or doors, which can largely do without aluminum facing on the room side, preferably also expensive and thermally unfavorable steel reinforcements on the inside and still convinced by high static load capacity, especially in the corner areas. In particular, the invention should have improved stability with respect to torsional forces that occur. In addition, a formed frame, e.g. for windows or doors, should have improved thermal insulation properties and preserve the optics and other advantages of a plastic hollow profile on the room side.

According to the present invention, this object is achieved, and preferably all of the objects are achieved, by a composite profile of the type mentioned at the outset, in which, on the inside of the inner wall of the plastic hollow profile pointing towards the inside of the profile and/or on a spaced-apart from the inner wall, preferably spaced parallel inner web of the plastic hollow profile, at least one inner reinforcement made of an aggregate-reinforced plastic is attached.

The inner reinforcement is preferably understood to mean that it lies inside the plastic hollow profile, ie in particular it is not visible from the outside. The inner reinforcement is preferably also understood to mean that it has a reinforcing effect in the local area surrounding the inner wall.

The inner wall mentioned is preferably that wall of the plastic hollow profile whose outer side faces the interior of a building when used as intended, ie which is visible from the interior of the room. On the other hand, the outer wall mentioned is the one whose outside faces the environment and which—at least if no outer wall reinforcement were attached—is visible from outside a building.

The respective inner sides of the outer wall and inner wall are directed towards the profile interior of the plastic hollow profile and are spaced apart from one another by cavities and/or other profile webs of the plastic hollow profile.

By attachment of the inner reinforcement to the inside of the inner wall is meant that the reinforcement is connected to the inwardly facing surface of the inner wall. An inner reinforcement on a web that is preferably spaced parallel to the inner wall can be attached to the surface of this inner web that faces the inner wall and/or the surface of this inner wall that faces the outer wall.

In the following, the plastic hollow profile means the entirety of all plastic webs which have no reinforcement by means of aggregates, ie are made of pure plastic material, eg PVC, and which are materially connected to one another. In the following, the composite profile means the entirety of all webs of the profile, regardless of whether the webs are made of pure plastic, plastic with added impact, or of materials other than plastic, such as metal.

The invention is based on the consideration of contrasting the static effect of the visible external reinforcement on the outer wall inside the plastic hollow profile with at least one internal reinforcement which, however, is invisible from the interior of the room.

In addition to the visible weathered outer wall reinforcement, the composite profile according to the invention can also have a further (non-visible) outer reinforcement on or in the outer wall, in particular which cooperates with the weathered outer wall reinforcement, preferably which is extruded, in particular coextruded, in or on the outer wall. The outer reinforcement is preferably understood to mean a reinforcement that is reinforced in the area surrounding the outer wall, in particular on/in it.

In such a case, the static effect of the visible outer reinforcement on the outer wall and the (not visible) outer reinforcement of the outer wall inside the plastic hollow profile is countered by at least one inner reinforcement, which is however invisible from the inside of the room.

All of the features of the inner reinforcement mentioned in this description can preferably also be provided in the same way for an outer reinforcement.

The invention can therefore achieve the same static properties as the prior art with two reinforcing elements placed on the outside, without the disadvantage of showing the reinforcing element towards the interior of the room.

Preferably, the outer wall reinforcement, in particular in connection with an outer reinforcement that may be used, and the at least one inner reinforcement can be designed such that they have the same or at least essentially the same reinforcing effect, in particular with regard to bending and/or torsion of the composite profile.

Preferably, it can also be provided that all reinforcing elements of the composite profile are on one side of the center of mass (relative to the composite profile cross-section) or on one side of a median plane and all reinforcing elements of the composite profile on the other side of the center of mass (relative to the composite profile cross-section) or on the other side of a median plane have the same or at least substantially the same reinforcing effect, in particular with regard to deflection and/or torsion of the composite profile.

The named median plane can be one which is parallel to the outer wall and inner wall and lies centrally between them or in the middle of the entire composite profile.

The reinforcing elements on the one hand can be, for example, the weathered outer wall reinforcement, in particular in connection with an outer reinforcement extruded into/onto the outer wall. The at least one reinforcing element on the other side can thus be the at least one inner reinforcement, in particular attached to the inside of the inner wall and/or to an inner web spaced apart from the inner wall, preferably for coextrusion. An internal reinforcement that is attached to the inside of the inner wall, for example by coextrusion, can also be directly referred to as an inner wall reinforcement.

An inner reinforcement which is attached to an inner web spaced apart from the inner wall, in particular lying parallel to the inner wall, preferably by coextrusion, is preferably attached to such an inner web which is at a smaller distance from the inner wall than from the outer wall. It is preferably ensured in this way that an inner reinforcement arranged in this way forms a “counterpole” to the outer wall reinforcement, in particular in connection with an outer reinforcement.

This inner web is preferably one which is directly adjacent to the inner wall, in particular so that no further web lying parallel to the inner wall is arranged between the inner wall and this inner web. Preferably the inner web is one that lies with one end under the glazing bead groove of the composite profile, in particular supporting it statically.

A web is preferably selected as the inner web for fastening the inner reinforcement which, based on the width of the composite profile, has a distance between the outer surfaces of the inner wall and the outer wall and the inner surface of the inner wall which is less than 25%, more preferably less than 15%, more preferably less than 10% of this width.

The inner web and inner wall can preferably be connected by at least one web, in particular which is oriented perpendicularly to the inner wall and inner web.

The reinforcing effect of the inner reinforcement is shifted as far as possible in the direction of the inner wall or spaced as far as possible from the outer wall by the above-mentioned design options, without being attached to this inner wall itself. Optical influences caused by fastening the inner reinforcement on the inside of the inner wall, which may show up on the outer visible side, e.g. in the case of co-extrusion, can thus be avoided.

The invention can provide for an inner reinforcement to be arranged on the inside of the inner wall and/or on an inner web spaced apart from the inner wall, or for several inner reinforcements to be arranged, the latter in particular if the inner side of the inner wall or the inner web in the height direction is covered by at least one bridge is divided. If there are several inner reinforcements on the inside of the inner wall and/or on the inner web, these several inner reinforcements are preferably aligned with one another with at least one surface, in particular which is parallel to the inner wall.

Preferably, exactly one inner reinforcement is provided, that is to say in particular either on the inside of the inner wall or on the inner web mentioned.

Provision is particularly preferably made for at least one inner reinforcement, preferably all of them, to be materially attached to the inside of the inner wall and/or to the inner web of the plastic hollow profile, preferably by coextrusion, in particular which means that the inner wall and/or the inner web of the plastic hollow profile and the at least one inner reinforcement are simultaneously extruded next to each other and are thereby bonded together. The term "coextrudate" as used here in relation to the present invention means that during the extrusion of the plastic hollow profile, both the inner reinforcement, possibly also other inner reinforcements, made of plastic reinforced with aggregate, e.g. made of fiber-reinforced plastic, and the unreinforced profile parts of the Plastic hollow profile as flowable extrudates, in particular made of different materials or material compositions.

The invention can provide for the conventional reinforcement components, such as e.g . However, the invention can also provide for the outer wall and at least one inner reinforcement to be used in combination with at least one conventional reinforcement component, e.g. with a steel reinforcement profile in a hollow chamber of the composite profile.

Provision can preferably be made for the inner wall of the plastic hollow profile to form an uncovered visible surface of the composite profile on the outside.

Furthermore, it can be provided that the outer wall reinforcement, possibly in conjunction with an outer reinforcement, and the at least one inner reinforcement, in particular together with a steel reinforcement arranged in a hollow chamber of the plastic hollow profile, form the only reinforcements of the plastic hollow profile.

The reinforcing and/or stabilizing additive substances in the plastic of the inner reinforcement is preferably formed by fibers and/or flakes, in particular made of glass or carbon or aramid. In principle, natural fibers can also be used. This can also be provided for the external reinforcement.

Such additives can cause increased wear on the tools during the extrusion process. In order to counteract premature wear, the aggregate-reinforced extrudates, in particular at least the at least one inner reinforcement, are preferably extruded on or in with non-reinforced PVC at least in certain areas or, in another embodiment, completely encased, in particular so that there is no contact with extrusion tools, which results in a longer service life of the tools leads. In this case, at least the at least one inner reinforcement made of aggregate-reinforced plastic is surrounded on all sides by unreinforced plastic, in particular embedded in the unreinforced plastic by coextrusion.

The composite profiles according to the invention can be used, for example, in a casement frame combination. Even without further mention, the composite profiles can also be used for mullion and mullion constructions, as well as for fixed glazing.

The outer wall reinforcement is preferably made of metal, in particular aluminum, in particular in the form of a shell which covers the outer wall with the inside of the shell. Other materials such as stainless steel or aggregate-reinforced, e.g. fiber-reinforced plastic or WPC can also be used for the outer wall reinforcement.

A possible embodiment can provide that the at least one inner reinforcement has at least two, preferably three, connected legs in a cross section perpendicular to the direction of longitudinal extension of the plastic hollow profile, in particular at least essentially L-shaped or C-shaped or U-shaped or F-shaped or T-shaped. Different legs can preferably have different thicknesses and/or different lengths.

Provision can be made for two legs connected at a connection point to extend in different directions from the connection point, preferably with each leg running parallel to a web of non-reinforced plastic of the plastic hollow profile.

This design makes it possible to achieve the highest possible intrinsic inertia with as little material as possible.

The variations of the geometric designs are manifold. Since the aggregate-reinforced extrudate is flowable and weldable, it is advantageous to design the corner regions where legs are connected to have a greater wall thickness than the remaining regions of the legs.

In particular, it can be provided that an accumulation of material made of plastic reinforced with aggregate is arranged in the region of the inner angle between two legs at a connection point. The interior angle is preferably understood to mean the angle which lies in the interior of a triangle formed from/with the legs. In particular, the interior angle is the smaller of the two angles included between the two legs under consideration. For example, the accumulation of material can be distributed unevenly or asymmetrically around the bisector of the inner angle and/or one of the legs can be thicker than the other due to the accumulation of material and/or the accumulation of material can form an at least partially planar surface in the inner angle area between the legs, preferably which has a different inclination to one of the legs than to the other leg.

Preferably, the inner reinforcement made of aggregate-reinforced plastic is greatest in a connecting area between at least two legs Material accumulation in favor of a high connection strength in this area.

These possible designs also lead to greater strength in the frame corners and the task of introducing the glass loads from the center of the profile into the inner reinforcement made of aggregate-reinforced material is taken into account.

It can also be provided that a leg which runs parallel to the inner wall of the plastic hollow profile has the longest extension and/or greatest thickness of all the legs of the same reinforcement in a cross section perpendicular to the longitudinal direction of the plastic hollow profile.

Furthermore, it can preferably be provided that the at least one inner reinforcement has a height in the cross section perpendicular to the longitudinal direction of the hollow plastic profile that is at least 40%, preferably at least 50%, preferably at least 60%, preferably at least 70% of the height of the inner wall on its outside .

A preferred embodiment can provide that the at least one inner reinforcement, in particular on one leg, has at least one recess, preferably an undercut recess, in which non-reinforced plastic of the plastic hollow profile is arranged, in particular by coextrusion, preferably being on top of the recess opposite side of the inner reinforcement a projection of aggregate-reinforced material is arranged. This results in a particularly secure bond between the reinforced and non-reinforced plastic.

In addition to the loading forces and the absorption of load on the visible surface of the outer wall reinforcement, for example by wind, loads from the fillings and their own weight act primarily in the plane of the plastic hollow profile.

Among other things, this dead weight permanently loads the corners of a welded frame made of plastic hollow profiles made of the composite material. To here one To ensure the highest possible resistance of the frame corner against these loading forces, it is necessary to be able to use the largest possible weldable area. Aggregate-reinforced materials can be welded, but do not achieve the high material and force-fitting properties of non-reinforced plastic.

Since the corner area in the outer wall reinforcement, e.g. made of aluminum, is firmly connected, it cannot be used for this task and the material of the outer wall reinforcement cannot be welded. The outer wall reinforcement is milled back before the corner welding process, so that only the unreinforced PVC core (the hollow plastic profile) and the reinforcements made of plastic reinforced with aggregate are melted and welded together with heating elements.

In order to be able to do this, the invention is based on a material for the at least one inner reinforcement made of reinforced plastic, which can be welded together with the unreinforced material of the plastic hollow profile, in particular in order to provide the highest possible resistance to the loading forces on the corners . In one possible embodiment, the matrix plastic in which the aggregate is embedded and which is used for the internal reinforcement is the same plastic as is present in the plastic hollow profile. In another embodiment, the matrix plastic can be a partially crystalline, thermoplastic, saturated polyester based on polybutylene terephthalate (PBT).

The load forces on the plastic hollow profile are mainly caused by the weight of the glass pane, the wind load and the thermal loads. The glass blocks, which are arranged between the glass pane and the frame in the diagonally opposite corners, direct the flow of forces in the frame.

The load force is largely due to the outer outer wall reinforcement, eg made of aluminum (possibly in conjunction with an outer reinforcement) and the added at least one inner reinforcement made of aggregate-reinforced plastic.

In the weather-side area, the load is in the area of the outer wall reinforcement, e.g. made of aluminum, and the outer wall reinforcement acts directly against this load.

According to the invention, the at least one inner reinforcement is arranged at the greatest possible distance from the center of gravity of the plastic hollow profile cross-section in order to absorb as high a load force as possible from the visible surface.

However, this is disadvantageous with regard to the absorption of the loading forces.

In order to also be able to optimally absorb loading forces in the plane of the plastic hollow profile, it can preferably be provided that the loading force is guided through the above-mentioned preferably provided legs, in particular which run perpendicular to the plane of the inner wall.

In order to bring the loading forces, for example of the glass pane, optimally from the plastic hollow profile into such legs and to transfer them to other legs, the increased stresses/moment stresses that can arise in the corner transition between the legs must be absorbed. This is preferably achieved in the invention in that the legs have greater wall thicknesses towards the connection area, in particular increasing wall thicknesses in the direction of the connection area, in particular as mentioned above. Depending on the load, the wall thicknesses can vary in thickness in order to optimally absorb stress peaks.

The at least one inner reinforcement with increased surcharge preferably has an outer and an inner contour, which are preferably not congruent to one another, in particular also do not become congruent to one another as a result of scaling. The outer contour preferably forms the contact line with the unreinforced plastic of the plastic hollow profile, in particular of the casement or window frame profile. Accordingly, those mentioned above are preferred Material accumulations arranged on the inner contour. The aggregate-reinforced material of the inner reinforcement(s) forms, together with the non-reinforced plastic material, a flowable extrudate during extrusion, which is extruded in one operation. The aggregate-reinforced plastic reinforcement adheres very well to the non-reinforced plastic, especially the PVC, due to its rough surface finish.

The geometric design of the outer contour forms the contacting surface. Preferably, this can have at least one undercut recess, e.g., in dovetail shape or indentations or cam formations. These lead to an additional form-fit connection due to a larger bond area with the unreinforced plastic of the frame, in particular the sash frame, window frame or setting post, which promotes the transmission of forces through shapes that fit into one another. In particular, glass loads can be derived better this way.

The inner contour forms the surface pointing towards the interior of a hollow chamber, in particular the surface visible from the hollow chamber, preferably which is extruded at least partially in contact with or into the unreinforced plastic.

In the embodiment of an inner reinforcement with at least two legs, in particular which are fastened to a base leg, the ends of the legs can be received in a fastening groove which is formed from non-reinforced plastic.

The invention further proposes forming the outer wall reinforcement from a metallic material, preferably aluminum. The largest possible synergistic effect of both reinforcements is achieved by the greatest possible spacing from the inner reinforcement, which is associated with a desired large distance between the stiffening elements and the center of gravity of the plastic hollow profile or the composite profile.

In order to achieve maximum load-bearing capacity, the outer wall reinforcement is preferably connected to the plastic hollow profile in a shear-resistant manner. This is preferably done by gluing the outer wall reinforcement to the outer wall of the plastic hollow profile, preferably in a fastening groove on the outside. The inner reinforcement made of the aggregate-reinforced material is also connected to the non-reinforced plastic of the plastic hollow profile in a shear-resistant manner due to the preferred extrusion process. In particular, it is cohesively bonded to the non-reinforced plastic at all contact points by extrusion. The combination of a metallic outer outer wall reinforcement and at least one reinforced inner reinforcement achieves a high load-bearing capacity while maintaining a high level of thermal insulation, while maintaining the appearance of the room and with the simultaneous high absorption of glass loads.

For the aggregate-reinforced inner reinforcement according to the invention, it can be provided that plastic is melted as granules and an aggregate is added as a reinforcing additive, e.g. glass fibers. The material mixture used for the inner plastic reinforcement is preferably a semi-crystalline, thermoplastic, saturated polyester based on polybutylene terephthalate (PBT). Depending on the requirements, various material mixtures with different levels of reinforcement additives are available as standard. This material mixture is characterized by very good flowability and can therefore be processed on extrusion systems.

A proportion, in particular a small proportion, of anisotropic fillers and reinforcing materials makes it possible to produce large-area, dimensionally stable components with little distortion, which poses a major challenge for plastics processors in particular.

Polybutylene terephthalate with reinforcement additive, especially fiber-reinforced polybutylene terephthalate (PBT) is characterized by high rigidity and strength, very good dimensional stability under temperature influences, low water absorption and good resistance to many chemicals.

In the co-extrusion process, polybutylene terephthalate (PBT) with reinforcement surcharge, in particular fiber-reinforced PBT, with the unreinforced plastic, in particular PVC, forms a highly rigid material combination that is excellently suited for the mechanical reinforcement of plastic hollow profiles for windows or doors. Compared to steel reinforcement, the composite profile is lighter, can be produced more cost-effectively and with reduced heat conduction. Potentially slimmer window profile geometries are feasible.

In one possible embodiment, the positioning and shaping of the at least one inner reinforcement with additional impact is designed in such a way that it can replace a conventional steel reinforcement in the plastic hollow profile in terms of load-bearing capacity. When installed, the composite profile has a high degree of dimensional stability and shows almost no post-shrinkage after installation. The significantly lower weight also makes processing and handling easier.

The co-extruded composite profile can be welded, in particular using the usual heating element welding process for window frame production, and can be further processed mechanically on the existing machine park.

The material mixture for the aggregate-reinforced plastic reinforcement can be used in several color gradations, in particular from white-opaque to black.

In all versions, it can preferably be provided that the ratio of the outer wall reinforcement to the area moment of inertia to the ratio of the at least one inner reinforcement to the area moment of inertia of the composite profile is 1:3.5 to 1:7, preferably 1:4 to 1:6, further preferably 1:4.5 to 1:5.5, especially when the outer wall reinforcement is made of metal, preferably aluminium, preferably in order to achieve essentially the same proportion of both reinforcements in the stiffening of the plastic hollow profile.

Furthermore, the outer wall, in particular the profile web of the plastic hollow profile that forms the groove base of the fastening groove, can preferably have at least essentially the same thickness as the web of the inner wall of the plastic hollow profile or as the web of the inner wall of the plastic hollow profile plus the thickness of a web of the plastic hollow profile, the one inner Reinforcement materially covered. These web parts mainly contribute to the stability of the corner welding.

1. a. an jedem von zwei Verbundprofilen wird jeweils ein Gehrungsschnitt unter einem vorbestimmten Winkel, insbesondere von 45 Grad, vorgenommen, bevorzugt der das Kunststoffhohlprofil und alle Verstärkungen des Verbundprofils gleichzeitig fluchtend durchtrennt,
2. b. an jedem von zwei Verbundprofilen wird parallel zur Gehrungsschnittebene in einer vorbestimmten Abtragungslänge Material von der Außenwandverstärkung entfernt, insbesondere wobei nach außen über den Grund der Befestigungsnut in der Außenwand vorstehendes Kunststoffmaterial und/oder zuschlagverstärktes Kunststoffmaterial entfernt wird, bevorzugt ohne einen Materialabtrag an dem Steg der Außenwand vorzunehmen, welcher den Grund einer Befestigungsnut bildet,
3. c. eine ggfs. vorhandene Stahlverstärkung wird in der Länge eingekürzt,
4. d. die auf Gehrung geschnittenen Endbereiche der zwei Verbundprofile werden nach Erwärmen und Aufschmelzen von unverstärktem und zuschlagverstärktem Kunststoffmaterial in der Gehrungsschnittfläche aneinandergepresst und hierdurch über Eck miteinander verschweißt, wobei die Außenwandverstärkungen der zwei Verbundprofile miteinander in Kontakt gebracht werden.

The invention includes the method for corner connection of two composite profiles in the following steps:

1. a. a miter cut is made at a predetermined angle, in particular of 45 degrees, on each of two composite profiles, preferably cutting through the plastic hollow profile and all reinforcements of the composite profile at the same time in alignment,
2. b. on each of two composite profiles, material is removed from the outer wall reinforcement parallel to the miter cutting plane in a predetermined removal length, in particular wherein plastic material protruding outwards beyond the bottom of the fastening groove in the outer wall and/or plastic material reinforced with aggregate is removed, preferably without material removal on the web of the outer wall to be made, which forms the bottom of a fastening groove,
3. c. any existing steel reinforcement is shortened in length,
4. i.e. After heating and melting unreinforced and reinforced plastic material, the mitred end areas of the two composite profiles are pressed together in the miter cut surface and thereby welded to one another at an angle, the outer wall reinforcements of the two composite profiles being brought into contact with one another.

Here, the fibre-reinforced plastic reinforcements can also be melted and form an additional, material and non-positive, load-bearing connection, which is otherwise essentially guaranteed by the PVC welding ribs.

The co-extrudate has good weldability in the frame corner area and connects with each other in a material and non-positive manner. This allows for a larger area to be welded, which is reflected in greater wall thicknesses.

The invention can provide that the plastic web of the plastic hollow profile, which forms the base of the fastening groove for the outer wall reinforcement, is the web with the greatest wall thickness in the plastic hollow profile. In the finished frame, this web of the PVC fastening groove forms a material and non-positive connection that is very stable.

In particular, the PVC webs that border the plastic profile on the outside represent the largest areas to be welded in the frame corner areas.

A preferred embodiment can provide that the PVC welding rib, which serves as a fastening groove for the outer outer wall reinforcement, has the same wall thickness or a greater wall thickness than the PVC welding ribs together, which have an inner reinforcement extruded with aggregate on both sides, i.e. on the inner as well as on the outer contour.

Due to the embodiment with legs that is provided, for example, the slam-reinforced inner reinforcement preferably offers at least one horizontal and at least one vertical leg.

This is useful, for example, when fastening strike plates in the window rebate of the frame using screws. For burglary protection, this must not only be done in PVC. Here, the horizontal leg of the reinforced inner reinforcement serves as an additional, stable mounting material, preferably in addition to the one that may be provided steel reinforcement. In particular, the design of the inner reinforcement with increased impact offers the screw more hold.

The vertical leg of the inner reinforcement preferably also offers additional stability when a rotary hinge is fixed to the frame with screws, in particular in addition to the fixation in the steel reinforcement.

The invention is explained in more detail below with reference to the drawings.

Fig. 1a

ein Verbundprofil eines Flügelrahmens im Schnitt mit einer wetterseitig, schubfest verbundenen Außenwandverstärkung aus Aluminium und einer zusätzlichen äußeren Verstärkung der Außenwand aus anextrudiertem zuschlagverstärkten Kunststoff,

Fig. 1b

eine Ausführung wie Fig. 1a mit einer abgewandelten Ausführung der zusätzlichen anextrudierten äußeren Verstärkung

Fig. 2a

ein Verbundprofil eines Blendrahmens im Schnitt mit einer wetterseitig, schubfest verbundenen Außenwandverstärkung aus Aluminium, einer anextrudierten äußeren Verstärkung und einer inneren Verstärkung aus anextrudiertem zuschlagverstärkten Kunststoff,

Fig. 2b

eine Ausführung wie Fig. 2a mit einer abgewandelten Ausführung der anextrudierten äußeren Verstärkung

Fig. 3

Verbundprofile einer Flügel- Blendrahmenkombination mit einer weiteren Ausführungsform der inneren Verstärkung

Fig. 3a

zeigt eine Detailansicht der inneren Verstärkung im Verbundprofil des Flügelrahmens gemäß der Figur 3

Fig. 3aa

zeigt eine weitere Ausführungsform der inneren Verstärkung in einem Verbundprofil eines Flügelrahmens

Fig. 3b

zeigt die Verbundprofile einer Flügel-Blendrahmenkombination mit einer Handbetätigung und zusätzlicher Befestigung eines Schließbleches in der inneren Verstärkung

Fig. 3c

zeigt die Verbundprofile einer Flügel-Blendrahmenkombination mit Dreh-Kipplager und dessen Befestigung in der innere Verstärkung.

Figur 4

zeigt die Verbundprofile mit einer inneren Verstärkung die statt an der Innenseite der Innenwand an einem zur Innenwand unmittelbar benachbarten und zur Innenwand parallelen Innensteg anextrudiert ist.

The figures show in detail:

Fig. 1a

a cross-section of a composite profile of a sash frame with a weather-side, shear-resistant connected outer wall reinforcement made of aluminum and an additional outer reinforcement of the outer wall made of extruded, aggregate-reinforced plastic,

Fig. 1b

an execution like Fig. 1a with a modified version of the additional extruded outer reinforcement

Figure 2a

a cross-section of a composite profile of a window frame with a weather-side, shear-resistant connected outer wall reinforcement made of aluminum, an extruded outer reinforcement and an inner reinforcement made of extruded, aggregate-reinforced plastic,

Figure 2b

an execution like Figure 2a with a modified version of the extruded outer reinforcement

3

Composite profiles of a sash and frame combination with a further embodiment of the inner reinforcement

Figure 3a

shows a detailed view of the internal reinforcement in the composite profile of the casement according to FIG figure 3

Fig. 3aa

shows another embodiment of the internal reinforcement in a composite profile of a casement

Figure 3b

shows the composite profiles of a sash/frame combination with manual operation and additional fastening of a locking plate in the inner reinforcement

3c

shows the composite profiles of a sash/frame combination with pivoting/tilting bearing and its attachment to the inner reinforcement.

figure 4

shows the composite profiles with an inner reinforcement which is extruded onto an inner web directly adjacent to the inner wall and parallel to the inner wall instead of on the inside of the inner wall.

In Figure 1a a composite profile 100 of a casement is shown in section. It includes a plastic hollow profile 10 made of unreinforced plastic, eg PVC. The outer wall 20, which faces the environment when used as intended, is provided with an outer wall reinforcement 30 that is connected on the weather side and is shear-resistant, with the shear-resistant connection being achieved in that the outer wall reinforcement 30 has adhesive feet 31 that point to the outside of the outer wall 20 and are attached to the outer wall 20 are attached with adhesive 32, here in an area that forms the groove bottom of a fastening groove 21 of the outer wall 20. In addition, the outer wall reinforcement 30 is fastened to the groove walls of the fastening groove with fastening webs, or is at least adjusted in the correct position. The outer wall reinforcement 30 made of aluminum forms a shell here, which completely covers, in particular overlaps, the outer visible surface of the outer wall 20 of the plastic hollow profile 10 .

On the inside of the inner wall 40 is an inner reinforcement 50 made of aggregate-reinforced plastic, for example plastic reinforced with glass fibers, by the coextrusion process with the unreinforced plastic of the plastic hollow profile 10 cohesively connected, ie extruded on. The inner wall 40 is that wall of the plastic hollow profile 10 which, when used as intended Use to room interior of a building points. The inside of the inner wall 40 points to the inside of the plastic hollow profile, e.g. to or into a cavity 60.

The outer outer wall reinforcement 30 in the form of a shell made of a metallic material, primarily aluminum, has a significantly higher modulus of elasticity and flexural strength as a metallic material compared to a plastic or fiber-reinforced plastic. As a result, the flexural rigidity of the composite profile is significantly increased and so, with the same geometry of the plastic hollow profile, a higher moment of inertia and a significantly higher load force can be absorbed than with a pure plastic hollow profile or one with additional reinforced plastic material.

In the present invention, the area moment of inertia of the outer outer wall reinforcement 30 made of aluminum is used as an individual component in relation to the geometry for absorbing glass loads or for absorbing partial glass loads on the weather-side wing rollover.

The aim of the load-bearing effect is to arrange the outer outer wall reinforcement made of e.g.

Due to the high resistance of a metallic material, the outer outer wall reinforcement 30 is attached on the weather side in order to achieve maximum load-bearing capacity here.

If the individual components are not connected, only the respective individual moments of inertia are added to the total moment of inertia according to Steiner.

The aim of the invention is therefore not just an addition of the individual components through a shear-resistant composite of all reinforcing components, in particular apart from a possibly inserted steel reinforcement profile To be able to bring moments of inertia to the approach, but also to bring the distance to the reference axis of the composite of the individual components into effect in the total moment of inertia.

By gluing the outer outer wall reinforcement 30 made of e.g. aluminum to the plastic hollow profile 10 e.g. made of unreinforced PVC, there is a very high composite effect and the associated shear strength and shear spring stiffness according to EN 14024 and an almost shear-resistant bond can be achieved.

In addition to the pure inertia portions of the components, the reference axes can also be adjusted using Steiner's theorem. The static effect of the composite here represents a significantly higher resistance, primarily against the load force on the visible shell surface, for example wind, and thus a significant increase in the flexural rigidity of the composite is achieved compared to the individual components.

The inner reinforcement 50 made of plastic with reinforced plastic, which acts as an inner support element, should also be connected as shear-resistant as possible, this is achieved by extrusion. It forms the static balance to the opposite outer wall reinforcement 30.

The inner reinforcement 50 made of reinforced plastic represents a counterpoint to the outer outer wall reinforcement 30 made of e.g. aluminum and thus ensures that the distance between the outer outer wall reinforcement, which is the main load-bearing task in relation to the absorption of loads on the Visible shell surface, for example wind, is increased by an inner inner reinforcement 50 made of plastic reinforced with aggregate to the reference axis of the overall supporting structure or the composite profile 100.

In order to be able to bring the load-bearing effect of the inner reinforcement 50 made of reinforced plastic into effect here and to arrange the reference axis as centrally as possible in the overall load-bearing structure and so on In order to achieve maximum distances between the reinforcements and the reference axis, the inner reinforcement made of plastic with reinforced plastic should preferably also have a higher modulus of elasticity and a higher flexural strength than the hollow plastic profile 10 made of unreinforced PVC.

In order to achieve this opposite pole, it is preferably provided to bring the geometric moment of inertia including the material-specific modulus of elasticity of the inner reinforcement made of a surcharge-reinforced plastic into a predetermined ratio with the outer wall reinforcement made primarily of aluminum and to achieve a balance here. The aggregate-reinforced, preferably fiber-reinforced plastics considered for the invention have a modulus of elasticity of 5000 to 22000 N/mm ² , preferably between 10000 and 20000 N/mm ² and particularly preferably between 12000 and 16000 N/mm ² . The ratio of the external wall reinforcement to the area moment of inertia to the ratio of the at least one inner reinforcement to the area moment of inertia of the composite profile should be 1:3.5 to 1:7, preferably 1:4 to 1:6, more preferably 1:4.5 to 1 : 5.5, in particular when the outer wall reinforcement is made of metal, preferably aluminum, preferably in order to achieve essentially the same proportion of both reinforcements in the reinforcement of the plastic hollow profile.

Preferably, the respective proportions of both reinforcements in the total area moment of inertia of the composite profile (incl.

Calculate outer wall reinforcement, plastic profile and inner reinforcement) in a manner known to those skilled in the art using Steiner's theorem.

This active principle is solved in the invention by an inner reinforcement made of aggregate-reinforced, preferably fiber-reinforced plastic.

Since the optics and surface properties on the room side are to be permanently provided by the unreinforced plastic hollow profile 10, the inner reinforcement 50 made of reinforced plastic is not attached to the visible surface of the inner wall 40, but is optically concealed, but as much as possible large distance from the center of gravity integrated on/into the unreinforced PVC plastic hollow profile 10 or completely extruded in and/or on, in particular on the inside of the inner wall 50.

In order to further strengthen the connection to the plastic hollow profile 10 made of e.g. PVC, an additional geometric design of the contacting surfaces of inner wall 40 and inner reinforcement 50 is preferably provided in this embodiment, e.g. by at least one recess 52, preferably an undercut recess 52 of the inner reinforcement 50, in which non-reinforced plastic of the plastic hollow profile is arranged, or alternatively by a recess, preferably an undercut recess of the inner wall 40, in which reinforced plastic of the inner reinforcement is arranged, in particular by co-extrusion, e.g. by a rectangular indentation or a dovetail connection ..

The material of the inner reinforcement 50 together with the non-reinforced plastic of the plastic hollow profile 10 forms a free-flowing extrudate which is extruded in one operation. The material of the inner reinforcement 50 adheres very well to the plastic of the plastic hollow profile 10 due to the rough surface finish. Forces (torques) are thus transmitted by form-fitting connections through molds that fit into one another.

In contrast to the connection of the metallic outer wall reinforcement 30 to the unreinforced plastic hollow profile 10, where a shear-resistant connection is achieved by a material connection, this task is achieved in the invention by a material connection and preferably also a form-fit connection between the aggregate-reinforced plastic of the inner reinforcement 50 and the ensures unreinforced plastic hollow profile 10 and achieves the supporting effect.

In the embodiment of the inner reinforcement shown in the figures, this is formed from a plurality of legs 50a, 50b, 50c. The legs 50a, 50b, 50c are connected via connecting areas 51, from which two legs extend away.

The impact-reinforced inner reinforcement 50 is provided with more material in the connection areas 51, ie an accumulation of material. This results in greater strength in the connection areas 51 and the task of introducing the glass loads from the center of the profile into the inner reinforcement 50 made of aggregate-reinforced material is taken into account.

In order to be able to optimally introduce the loading forces in the preferred C-shaped, inner reinforcement 50 made of plastic with added value, the connecting areas 51 preferably have a greater wall thickness than the straight sections of the legs 50a, 50b, 50c outside the connecting areas 51. This thickening of the material in the connection areas 51 optimizes the power flow transmission and absorbs stress peaks.

The C-shaped, impact-reinforced inner reinforcement 50 is formed here from three legs 50a, 50b and 50c and forms three hollow chambers 60a, 60b, 60c with the plastic hollow profile. The C-shaped inner reinforcement 50 has two open ends of legs 50a, 50c with one free end being received in a small mounting groove 14. As shown in FIG. The outer contour of the inner reinforcement 50 pointing towards the inner wall 40 is at least partially in contact with the inner wall 40 and is extruded completely onto the inner wall 40 in the contact area.

The stress peaks and the transmission of forces from the legs 50a, 50b, 50c can be absorbed in the invention or higher stresses can be transmitted by the inner reinforcement 50 made of plastic reinforced with aggregate, preferably C-shaped with 3 legs 50a, 50b, 50c is formed and two legs 50a, 50c depart at an angle, in particular a right angle, from a leg 50b forming the base. Preferably, the legs 50a, 50b, 50c are each aligned parallel to certain profile webs of the plastic hollow profile 10. The outer and inner contour of the inner reinforcement 50 are preferably not congruent to one another and are characterized by different contours and wall thicknesses.

For greater rigidity in the area of the outer wall, at least one further reinforcement of the outer wall 20, referred to as outer reinforcement 70, e.g. This outer reinforcement 70 is therefore in the profile cross section of the plastic hollow profile 10.

If, in addition to the weathered outer wall reinforcement 30, an outer reinforcement 70 of the outer wall 20 made of aggregate-reinforced plastic is provided, the invention can provide that the aforementioned proportion of the contributions to the area moment of inertia with regard to the outer wall reinforcement together with the outer reinforcement made of aggregate-reinforced plastic on the one hand and the at least an internal reinforcement on the other hand.

Extruding in instead of on-extruding, which can also be provided for the internal reinforcement, prevents increased wear on the tools during the extrusion process. In this embodiment, the slam-reinforced inner reinforcement 70 is above the ground level of the fastening groove 21 where the adhesive feet 31 are fastened and lies between them or between their adhesive 32. It is milled back together with the outer wall reinforcement 30 in preparation for a corner weld.

Figure 1b shows a cross-section of a composite profile 100 of a wing frame with an outer wall reinforcement 30 connected in a shear-resistant manner on the weather side and an inner reinforcement 50 extruded onto the inner wall 40, as well as an outer reinforcement 70 extruded in in another embodiment. In contrast to Figure 1a another variant of the shear-resistant connection of the extrudates is selected here. The inner reinforcement 50 has here not undercut recesses 52, which lead to a larger composite surface and with the Inner wall 40 of the plastic hollow profile 10 form a comb-like positive connection, in particular in addition to the material connection by coextrusion.

The aggregate-reinforced outer reinforcement 70 is designed in such a way that it remains as a weldable strip of aggregate-reinforced plastic even after the outer wall reinforcement has been milled back down to the bottom of the fastening groove 21 contacted by the adhesive feet. For this purpose, the outer reinforcement 70 is extruded in the outer wall 20 lying parallel to it, in particular in the bottom of the fastening groove 21, and has ends 70a that are tapered in thickness compared to a thicker central region, the tapered ends 70a lying behind the bottom of the fastening groove 21 , which is contacted by the adhesive feet 31 and the thicker central area between the adhesive feet 31 or their adhesive 32 is located.

In the statements of Figure 1a and 1b no inserted steel reinforcement profile is provided in the plastic hollow profile, but one can be used in addition.

Figure 2a shows a cross-section of a composite profile 100 of a window frame with an outer wall reinforcement 30 connected with shear resistance on the weather side and an inner reinforcement 50 as well as an outer reinforcement 70. The C-shaped inner reinforcement, on the outer contour of which is completely extruded onto the plastic hollow profile 10, is on the outer contour Inner wall has recesses 52 and projections 53 provided. On the one hand, this offers an additional form fit and, on the other hand, thickened material areas if required for fastening means, for example for screws. In this embodiment, a wall of the plastic hollow profile 10 parallel to the inner wall 40 is supported on the inner contour of the inner reinforcement 50 . In addition, this version shows an inserted steel reinforcement profile. The outer reinforcement 70 is in accordance with the features of the outer reinforcement of Figure 1a arranged.

Figure 2b shows a cross section of a composite profile 100 of a window frame with an outer wall reinforcement 30 connected to the weather side in a shear-resistant manner and an inner one Reinforcement 50, as for Figure 2a described, and an outer reinforcement 70, as for Figure 1b described. This version is with Figure 1b comparable and differs only in the dimensions.

figure 3 shows the composite profiles 100 of a sash/frame combination with a further embodiment of the respective inner reinforcement 50. The further development consists above all in the fact that the slam-reinforced outer reinforcement facing the weather side is omitted. Instead, the inner reinforcement 50 with reinforced slamming on the room side is characterized by greater wall thicknesses. The legs 50b forming a base of the internal reinforcement are thicker than the adjoining legs 50a, 50cf and preferably at least substantially twice as long or more than twice as long.

The additional reinforced inner reinforcement 50 of the composite profile 100 forming the casement frame does not extend into the casement overlap 11 of the plastic hollow profile 10 . Instead, the corner regions 51, from which the legs 50a, 50c extend in different directions, are compact and dense nodal points with the greatest accumulation of material. On the wing, the design of the internal reinforcement 50 is chosen such that it has a portion 50d that extends the leg 50b forming the base and which extends beyond the connecting portion 51 but does not extend into the wing flap. The base leg 50b and the extended portion 50d are parallel to the inner wall 40.

In this embodiment, the slam-reinforced inner reinforcements 50 are firmly embedded in the plastic of the plastic hollow profile 10, preferably extruded in, in particular thereby surrounded on all sides by the non-reinforced plastic of the plastic hollow profile 10 with contact. The inner reinforcements 50 are provided with a dovetail recess 52 for the inner wall 40 , which forms a positive connection with the inner wall 40 .

The composite profile 100 of the wing frame is preferably free of additional steel reinforcements. The composite profile 100 of the window frame can preferably have a beam reinforcement.

Figure 3a shows a detailed view of the inner reinforcement in the casement according to FIG figure 3 .

The outer contour of the inner reinforcement 50 is not congruent to the inner contour, not even by scaling, and while the outer contour in the connecting area 51 merges with a radius between the legs, the inner contour in the connecting area 51 between the legs is provided with a chamfer or flat surface 56. This contouring with a chamfer/flat surface 56 leads to an even greater wall thickness with an increased accumulation of material in the connection area 51. In FIG Figure 3a It can be seen more clearly that the inner reinforcement 50 is surrounded on all sides with non-reinforced plastic, in particular on the inner contour with the wall 41 which is thinner than the inner wall and which runs parallel to the inner wall 40 in some areas.

Figure 3aa 14 shows another embodiment relating to the placement of the undercut recess 52 on the inner reinforcement 50. FIG. In this embodiment, this is formed facing away from the inner wall 40 made of plastic, in particular on the inner contour of the inner reinforcement 50 . The aggregate-reinforced inner reinforcement 50 is also completely embedded in pure PVC here.

Figures 3b and 3c show the composite profiles of a sash/frame combination with manual operation 90 and additional attachment of a striker plate 91 in the reinforced inner reinforcement 50 and with a rotating hinge 92 and its attachment in the inner reinforcement 50.

Due to the angled geometry, the slammed inner reinforcement 50 provides at least one horizontal leg 50a and one vertical leg 50b.

This is useful, for example, when fastening locking plates 91 in the window rebate of the plastic hollow profile 10 by means of screws 93. This must not only be done in the pure plastic of the plastic hollow profile 10 for burglary protection. Here, the horizontal leg 50a of the inner reinforcement 50 serves as an additional, stable assembly material, in addition to the steel reinforcement 80. In particular, the design of the inner reinforcement with thickened base legs compared to the other legs offers the screw 93 more support.

The vertical leg 50b of the inner reinforcement 50 also offers additional stability when a rotary hinge 92 is fixedly mounted on the composite profile 100 of a window frame with screws 93', in particular in addition to the fixation in the steel reinforcement 80.

In a modification of the previous figures shows the figure 4 an embodiment variant in which the inner reinforcement 50 is not extruded on the inside of the inner wall 40, but on an inner web 41 of the plastic hollow profile 10, which is immediately adjacent to the inner wall 40. The inner web 41 is thus viewed in the direction from the inner wall 40 inwards into the profile 10 to the inner wall 40 of the next adjacent web, ie between the inner wall 40 and the inner web 41 there is no other web parallel to the inner wall 40 .

This has the advantage that the inner reinforcement 50—if it is not to be extruded onto the inner wall 40—occupies the maximum possible distance from the center of gravity of the profile or also from the outer wall 20 . Such an arrangement can be desired if it turns out that the co-extrusion on the inside of the inner wall 40 causes an optical change on its outer visible side, which is then avoided with this embodiment.

In the figure 4 The embodiment shown does not have an extruded outer reinforcement of the outer wall 20, but it can also include one, as shown in FIG figures 1 and 2 shown. The statements made there also apply accordingly to such an embodiment figure 4 .

Reference List

10

plastic hollow profile

11

rollover

14

Fastening groove for leg end

20

outer wall

21

mounting groove

30

outer wall reinforcement

31

adhesive feet

32

adhesive

40

inner wall

41

Inner bar parallel to the inner wall

50

internal reinforcement

50a,b,c

Legs of internal reinforcement

50d

extended portion of base leg 50b

51

connection area

52

Recess, preferably undercut

53

protrusions

56

Chamfer, flat surface at connection area

60

cavity

70

outer reinforcement (of the outer wall)

70a

tapered ends of the outer reinforcement

80

steel profile

90

manual operation

91

locking plate

92

rotating tape

93

screws

Claims (16)

Composite profile (100) for producing frames for windows or doors, comprising a plastic hollow profile (10), in particular made of polyvinyl chloride, with a plurality of hollow chambers (60), on the outside of the outer wall (20) of the plastic hollow profile (10), in particular that outer wall ( 20), which is weathered during intended use, an outer wall reinforcement (30), preferably made of metal, in particular aluminum, is fastened in a shear-resistant manner, preferably on/in a fastening groove (21) of the outer wall (20), characterized in that on the On the inside of the inner wall (40) pointing towards the inside of the profile and/or on an inner web (41) of the plastic hollow profile (10) which is at a distance from the inner wall, in particular that inner wall (40) which, when used as intended, faces the interior of a building, at least one inner reinforcement (50 ), Preferably exactly a single inner reinforcement (50) made of an aggregate-reinforced plastic is materially attached, preferably by coextrusion. Composite profile according to Claim 1, characterized in that the inner wall (40) forms an uncovered visible surface on the outside. Composite profile according to one of the preceding claims, characterized in that the outer wall (20) of the plastic hollow profile (10) in addition to the weathered outer wall reinforcement (30) has at least one outer reinforcement (70) made of aggregate-reinforced plastic extruded on or into the outer wall (20). Composite profile according to one of the preceding claims, characterized in that the weathered outer wall reinforcement, in particular in connection with an on or in the outer wall (20) extruded outer reinforcement (70) on the one hand and the at least one inner reinforcement (50) on the other hand are arranged on opposite sides around the center of mass of the plastic hollow profile (10) or around a central plane of the plastic hollow profile (10). Composite profile according to one of the preceding claims, characterized in that the inner reinforcement (50) is arranged on an inner web (41) which is at a smaller distance from the inner wall (40) than from the outer wall (20), in particular at the distance from the inner wall (40 ) immediately adjacent inner web (41) is arranged. Composite profile according to one of the preceding claims, characterized in that the outer wall reinforcement (30), in particular in connection with an outer reinforcement (70) according to claim 3, and the at least one inner reinforcement (50), in particular together with a hollow chamber (60 ) of the plastic hollow profile (10) arranged steel reinforcement (80) form the only reinforcements of the plastic hollow profile (10). Composite profile according to one of the preceding claims, characterized in that at least the at least one inner reinforcement (50) made of aggregate-reinforced plastic is surrounded on all sides by unreinforced plastic, in particular embedded in the unreinforced plastic by coextrusion. Composite profile according to one of the preceding claims, characterized in that the at least one inner reinforcement (50) has at least two, preferably three connected legs (50a, 50b, 50c), in particular at least essentially L -shaped or C-shaped or U-shaped or F-shaped or T-shaped, preferably with different legs (50a, 50b, 50c) having different thicknesses and/or lengths, with two legs connected at a connection point (51). (50a, 50b, 50c) extending in different directions, preferably with each leg (50a, 50b, 50c) runs parallel to a web made of unreinforced plastic. Composite profile according to Claim 8, characterized in that in the area of the inner angle between two legs (50a, 50b, 50c) at a connection point (51) there is an accumulation of material made of plastic with added impact, in particular a. the accumulation of material is unevenly or asymmetrically distributed around the bisector of the interior angle, and/or b. the accumulation of material thickens one of the legs (50a, 50b, 50c) more than the other and/or c. the accumulation of material in the inner angle area between the legs forms an at least partially planar surface (56), preferably which has a different inclination towards one of the legs (50a, 50b, 50c) than towards the other leg (50a, 50b, 50c). Composite profile according to Claim 8 or 9, characterized in that a leg (50b) which runs parallel to the inner wall (40) of the plastic hollow profile (10) has the longest extent and/or greatest thickness of all the legs (50a , 50b, 50c) of the same gain (50). Composite profile according to one of the preceding claims, characterized in that the at least one inner reinforcement (50) has a height in cross section perpendicular to the longitudinal extension direction of the plastic hollow profile (10) which is at least 40%, preferably at least 50%, preferably at least 60%, preferably at least 70% of the height of the inner wall (40) on the outside thereof. Composite profile according to one of the preceding claims, characterized in that the at least one inner reinforcement (50), in particular on a leg (50a, 50b, 50c), at least one recess (52), preferably an undercut recess (52) in which non-reinforced plastic of the plastic hollow profile (10) is arranged, in particular by coextrusion, preferably with a projection made of aggregate-reinforced material being arranged on the side of the inner reinforcement (50) opposite the recess (52). Composite profile according to one of the preceding claims, characterized in that the supplement in the plastic of the inner reinforcement (50) is formed by fibers and/or flakes, in particular made of glass, carbon, aramid. Composite profile according to one of the preceding claims, characterized in that the proportion of the outer wall reinforcement (30) in the area moment of inertia, in particular together with an outer reinforcement (70) extruded on or into the outer wall (20), contributes to the proportion of the at least one inner reinforcement (50) for The area moment of inertia of the composite profile is 1:3.5 to 7, preferably 1:4 to 6, more preferably 1:4.5 to 5.5, in particular when the outer wall reinforcement (30) is made of metal, preferably aluminum, preferably by im To achieve substantially the same proportion of both reinforcements (30, 50) in the stiffening of the plastic hollow profile (10). Composite profile according to one of the preceding claims, characterized in that the outer wall (20), in particular the profile web of the plastic hollow profile (10) forming the bottom of the fastening groove (21), has at least essentially the same thickness as the web of the inner wall (40) of the Plastic hollow profile (10) or like the web of the inner wall (40) of the plastic hollow profile (10) plus the thickness of a web (41) of the plastic hollow profile (10) which covers an inner reinforcement (50) in a materially bonded manner. Frame for a window or a door, characterized in that it is formed from composite profiles (100) according to any one of the preceding claims, the composite profiles (100) in the corner areas of the frame are thermally welded to one another in the contacting miter cut surface areas made of unreinforced and reinforced plastic.

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