COMPOSITE PROFILE

Description

TECHNICAL FIELD OF THE INVENTION

[0001] The invention relates to a composite profile according to the preamble of claim 1 and a frame or window profile according to the preamble of independent claim 14. The invention also relates to a method for producing a composite profile according to the preamble of independent claim 18. BACKGROUND OF THE INVENTION

[0002] Composite profiles are increasingly being used in a wide variety of applications and, as a result, must be able to withstand varying loads. The composite profile is designed to achieve optimal use of their material properties through the targeted use of at least two different materials. The transitions between the materials pose a challenge to the strength of composite profiles. The connection between the materials in a composite profile forms a weak point when the composite profile is subjected to stress. Failure of the composite profile is expected to occur at a connecting surface between two materials. For this reason, strengthening the connection between the materials in a composite profile increases the strength of the entire composite profile.

[0003] In modern buildings, high demands are placed on the thermal and acoustic insulation properties of walls. In a wall, windows and doors provide access from the inside of the wall to the outside. For this reason, windows and doors can represent a weak point for heat transfer throughout the entire wall and are therefore a particular focus when improving their insulation properties. In addition to high thermal insulation, high sound insulation of window and door panels is also required.

[0004] For thermal insulation, installing insulating bars in the frame of window and door sashes has proven effective. The insulating bars form the connection between the outer and inner shells of a window or door sash, which together form the frame of the window or door.

[0005] DE 20 2018 006 104 U1 shows a profile comprising a substrate base body and a coating applied to a surface region of the substrate base body. The substrate base body is manufactured using a first polymer material, wherein the coating comprises a second matrix polymer that is compatible with the first polymer. The substrate base body can be formed by an extruded insulating profile. The coating on the substrate preferably has an average observable thickness of approximately 100 µm or less. The coating of the substrate base body enables perfect paint coverage, i.e., a homogeneous, opaque powder application. To produce the profile, a solvent is selected that matches the matrix polymer and the first polymer of the substrate base body. The solvent can be a liquid chemical pure substance or a mixture of such pure substances.

[0006] FR 2 971 808 shows a thermal insulation profile consisting of two thermoplastic polymers. A first polymer forms a porous core, and a second polymer forms the core's sheath. Dovetail-shaped projections are provided on the longitudinal sides; these projections are formed by the first polymer and thus form part of the core. The core and sheath are preferably made of polyvinyl chloride (PVC). The thermal insulation profile is intended to be manufactured using a coextrusion process, with the polymer forming the core being injected into the sheath and subsequently filling it.

[0007] WO2015189348 discloses a spacer profile made of a plastic material, which can be formed into a composite profile by adding additives or fillers. The additives or fillers include, among other things, various fibers such as glass fibers. The spacer profile can be used as a thermoset or thermoplastic. Furthermore, it is disclosed that plastic spacer profiles can be manufactured from polyamide with a glass fiber content of 10% to 40% by extrusion. In a preferred embodiment, the disclosed spacer profile can accommodate a strand-shaped insulating material. In a further embodiment, the inclusion of foam masses in designated areas of the spacer profile is proposed, wherein the foam masses are applied flush with the spacer profile. The foam masses serve to improve the mechanical strength and thermal insulation of the spacer profile.

[0008] Another insulating bar is known from EP 2 666 949 as a composite profile. This is designed as a foamed, fine-pored plastic body, which is held on two opposite sides by plastic profiles. These plastic profiles, in turn, form a positive connection with the outer and inner shells of the sash frame.

[0009] A large temperature difference between the outside and inside of a door or window sash leads to a large temperature difference between the inner and outer shells of the sash frame. In the insulating bars that form the connection between the inner and outer shells, the temperature difference on both sides causes large tensile and shear stresses within the component.

[0010] As already described above, stresses in a composite profile pose a major challenge to the bond line between the different materials, as in the case of WO2015189348 between the plastic profile and the foam mass, or in the case of EP 2 666 949 between the plastic profile and the plastic body. The bond line between the two materials represents a weak point against shear stresses, so failure of a composite profile subjected to shear stress is most likely to occur at the bond line between the two materials or at the connection point with the profile shells.

[0011] DE 32 27 509 A1 discloses a composite profile with a plastic insulating web. The insulating webs, with their dovetail-shaped ends in cross-section, protrude into correspondingly formed, longitudinal grooves in the composite profile parts. The insulating web consists at least partially of foamed plastic with a porous or cellular structure. Suitable foamed plastics are polyamide, in particular polyamide 6.6, or polyethylene terephthalate. The foamed plastic can be reinforced with glass fibers. In one embodiment, the insulating web has an inner core made of foamed plastic, which is surrounded by a sheath made of unfoamed plastic, for example, polyamide or polyethylene terephthalate. Such a web can be produced, for example, by coextrusion of the inner core and sheath.The sheath particularly meets the requirements for chemical and physical resistance, for example when anodizing or hot-painting the composite profile. TASK

[0012] The aim of the subject matter of the invention is to propose a composite profile which has a higher strength than the commercially available composite profiles from the prior art.

[0013] Furthermore, it is an object to propose a frame or sash profile with a composite profile according to the invention for windows or doors, which has improved insulation properties. DESCRIPTION

[0014] This task is fulfilled by a composite profile according to claim 1.

[0015] The invention relates to a composite profile with a foamed core made of a first plastic and a sheath made of a second plastic surrounding the core, which sheath encloses the core in a form-fitting manner. The first and second plastics are compatible with one another, so that they form a material-to-material bond. Because the first plastic is completely covered by the second plastic, the composite profile can absorb greater forces. The load-bearing capacity of the composite profile can be further increased if a material-to-material bond is created between the two plastics. The composite profile is an elongated profile whose length is a multiple, in particular more than five times and preferably ten times, its width or thickness.

[0016] Dividing the composite profile into a core and a layer surrounding the core allows for the use of different materials in these two areas, with the material being selected based on the loads expected in each area. The layer surrounding the core, made of a second plastic, can be seen as increasing the rigidity of the composite profile. By attaching the layer around the core, it can absorb the tensile, compressive, and torsional forces that arise when the composite profile is bent or twisted. For this reason, a material is proposed as the second plastic that has good properties for absorbing both tensile and compressive forces. The targeted use of material properties in the two areas of the composite profile leads to optimal use of resources.

[0017] The bond is achieved because the two plastics belong to the same plastic family and are therefore compatible with each other. This property allows the two plastics to be welded together, provided certain process parameters are observed.

[0018] The material-to-material connection between the first and the second plastic has the advantage that no additional adhesive is required to create a firm connection between the first and the second plastic.

[0019] The foamed core is formed from a porous material. Porosity is defined as the ratio of the total void volume to the total volume. The foamed core preferably has a porosity between 0.6 and 0.95.

[0020] The composite profile can also be described as a so-called sandwich structure consisting of three layers, with the first plastic forming the middle layer and the second plastic forming the remaining two layers. It is important to note that in the composite profile according to the invention, the second plastic encloses the first plastic.

[0021] The advantageous design variants listed below, either alone or in combination with one another, lead to further improvements in the composite profile.

[0022] Preferably, a molded portion is provided on the end face of opposite sides of the composite profile to establish a positive, non-positive, and / or material-locking connection, preferably a positive connection, with other parts. The molded portion can be used either to attach the composite profile to an existing component or to accommodate another component through the composite profile. In contrast to a material-locking connection, the positive and non-positive connection allows the composite profile to be detached from the other part and, if necessary, reconnected simply by applying force.

[0023] In a preferred embodiment, the projections are arranged on the long sides of the composite profile. Since the projections serve to establish a connection with another component, attaching the projection to the long side of the composite profile ensures the longest possible connection line and, at the same time, the largest possible connection surface between the composite profile and the component connected to it. The resulting largest possible connection surface makes it possible to minimize the pressure on this surface, which arises from the transfer of force from the composite profile to the other component or vice versa.

[0024] In a further preferred embodiment, a molding in the form of a dovetail-shaped extension, a notch, or the like made of the second plastic is provided on opposite sides of the composite profile. The dovetail-shaped extension forms an ideal shape for a positive connection. The dovetail-shaped extension can be created by applying two notches on opposite sides. Preferably, the molding on the composite profile is formed by the second plastic. Due to the use of the second plastic for the design of the moldings, the core does not need to undergo any reshaping.

[0025] The second plastic preferably encloses the outer surface of the foamed core. The outer surface is formed by the largest sides of the core, excluding the two smallest sides. In a cuboid-shaped core structure, the four largest side surfaces form its outer surface. By enclosing the outer surface of the core, the largest possible area of ​​the core is encased.

[0026] In a further preferred embodiment, the composite profile has a maximum thickness of 40 mm, preferably 25 mm. The thickness has a directly proportional influence on the volume of the composite profile and thus also on the amount of material to be used in production. Reducing the amount of material has a direct impact on production costs. At the same time, the thickness influences the heat flow, which occurs when the composite profile is exposed to different temperatures on its two opposite long sides. The composite profile can be intended, among other things, for thermal insulation. To be able to fulfill this task, it must have the lowest possible thermal conductivity, which is achieved on the one hand by selecting suitable materials and on the other hand by the cross-sectional area of ​​the selected material.The heat transported through the composite profile, or heat flow, depends on the product of the thermal conductivity and the cross-sectional area of ​​the composite profile perpendicular to the connecting line between the two different temperature regions. This means that the heat flow through the composite profile depends not only on its thermal conductivity but also on its thickness. The lower the thermal conductivity of the materials used and the thickness of the composite profile, the lower the heat flow through the composite profile. Thus, reducing the thickness of the composite profile benefits thermal insulation. When using two different materials, as in the composite profile according to the invention, the distribution of the heat flow between the materials depends on their thermal conductivity.Since the foamed core offers high thermal insulation due to its porosity, the heat is willing to follow the path of least resistance and flow via the second plastic. For this reason, in addition to reducing the overall thickness of the composite profile, reducing the layer thickness of the second plastic has a significant influence on increasing the thermal insulation of the entire composite profile. The second plastic is preferably intermixed with short fibers, preferably short glass fibers, which typically have a length of between approximately 1 and 5 mm. Fibers in a composite material primarily serve to absorb tensile forces. The use of short glass fibers in the plastic increases the strength and rigidity of the plastic, enabling it to withstand higher bending and tensile loads.

[0027] Advantageously, the proportion of short glass fibers in the second plastic is 10% to 40%, preferably 20% to 30%. The percentages refer to the mass of the plastic and the short glass fibers. The proportion of short glass fibers of 10% to 40% represents the range that significantly increases the strength of the plastic and allows for comparatively inexpensive production of the plastic containing short glass fibers. The range of 20% to 30% short glass fibers in the second plastic results in an even better compromise between the achieved strength of the plastic and the cost of its production.

[0028] In a further preferred embodiment, the first plastic has a density of 120 to 450 kg / m3, preferably 150 to 350 kg / m3, and even more preferably 170 to 300 kg / m3. As described above, the first plastic forms the foamed core of the composite profile. Due to its porous structure, the first plastic has a lower density than the second plastic. Thanks to its low density, the core has a low mass, but is also ideally suited for absorbing compressive and shear forces.

[0029] Preferably, the first plastic comprises PET. The use of PET as the first plastic offers several advantages. PET has been used as a material in various industries for decades without any negative experiences. Compared to metals, PET has the advantage that, as a plastic, PET does not corrode, which greatly simplifies the maintenance of products made from it. Since PET is a recyclable material, its production also has a better environmental footprint than other materials. Furthermore, PET can be processed with conventional aluminum or woodworking tools and requires no additional protective measures. Screws fastened in a PET foam core achieve an unexpectedly high extraction force. PET is also preferred in constructions due, among other things, to its fire-retardant properties.Compared to other commonly used plastics, PET, especially when crystallized, has a high temperature resistance.

[0030] The second plastic preferably comprises PET or PBT. Both PET and PBT are thermoplastics. The positive properties of PET mentioned above can be repeated here and extended to PBT, as it has a very similar chemical structure to PET and therefore belongs to the same polyester family. Compared to other commonly used plastics, such as PVC, PET and PBT exhibit higher temperature resistance.

[0031] In a further preferred embodiment, the width of the composite profile is at least four times, preferably at least six times, the thickness of the composite profile. In such an embodiment, the composite profile forms a flat component or a flat beam. Due to the use of a composite of selected materials, the thickness of the composite profile can be reduced. This, in turn, leads to a more compact and space-saving design of the composite profile.

[0032] In a further preferred embodiment, the foamed core has a cross-section in the shape of a flat rectangle and the second plastic on the flat sides of the core has a thickness of between 0.1 mm and 5 mm, preferably between 0.1 mm and 3 mm and particularly preferably between 0.1 mm and 2 mm and even more preferably between 0.1 mm and 1 mm. A thin layer of the second plastic helps to keep the thickness of the entire composite profile to a minimum. Even if the production of such a thin layer represents a challenge, it offers the advantage of lower weight and smaller volume. In particular, the thin layer of the second plastic helps to increase the thermal insulation of the composite profile.

[0033] The present invention also relates to a frame profile or sash profile for windows or doors comprising a composite profile according to the invention. Due to its high thermal and sound insulation, the composite profile according to the invention is ideal for use in a frame or sash profile. The composite profile serves as an additional barrier for both heat and sound between the interior and the exterior.

[0034] Preferably, the composite profile is arranged between an outer shell and an inner shell of the window or door. In this configuration, the advantageous properties of the composite profile according to the invention are particularly effective. Ideally, the composite profiles form the only connection between the inner and outer shells. As a result, heat must always flow from the inner shell to the outer shell, or vice versa, via the composite profile. The thermal insulation properties of the composite profile directly determine those of the entire frame or sash. The positive connection offers the possibility of an easily removable but stable connection between the composite profile and the inner or outer shell.

[0035] In another preferred embodiment, the projections in the composite profile form a positive connection with the outer and inner shells of the window or door. The projections attached to both ends of the composite profile determine the width of the composite profile as the distance between the inner and outer shells. This also allows the entire width of the composite profile to be used.

[0036] The present invention also relates to a method for producing a composite profile in which a core is formed by a PET rigid foam and this is overmolded by a plastic made of fiber-reinforced PET or PBT, wherein the overmolded core by the fiber-reinforced plastic is carried out in an extrusion process.

[0037] The extrusion process has the advantage that the production time is reduced many times compared to current processes and therefore a larger quantity of composite profiles can be produced within the same time.

[0038] Advantageously, when the core is overmolded with fiber-reinforced plastic, a material bond is created between these plastics. As already described above, this material bond ensures a stronger bond between the plastics and simultaneously leads to greater load resistance of the entire composite profile.

[0039] The composite profile is preferably anodized, powder-coated, or wet-painted after production. Manufacturing the composite profile from two thermoplastics such as PET and / or PBT using an extrusion process enables a wide range of further processing options. Further processing of the composite profile can increase its durability and / or strength.

[0040] The post-treatment of the composite profile, such as painting, is made possible, among other things, by the surface that results from the PET or PBT coating.

[0041] The optional features mentioned can be implemented in any combination, provided they are not mutually exclusive. In particular, where preferred ranges are specified, further preferred ranges result from combinations of the minimums and maximums specified in the ranges. BRIEF DESCRIPTION OF THE CHARACTERS

[0042] Further preferred embodiments of the invention will become apparent from the following description with reference to the figures. They show, in a schematic representation not to scale: Figure 1: a sectional view of an insulating bar in a frame profile of a window sash according to the prior art; Figure 2: a sectional view of a composite profile according to the invention arranged as an insulating bar in the frame profile made of Figure 1 ; Figure 3: a sectional view of a composite profile according to the invention with laterally offset projections arranged in the frame profile of Figure 1; Figure 4: a sectional view of a composite profile according to the invention with additional cross beams arranged in the frame profile of Figure 1 ; Figure 5: a sectional view of a composite profile according to the invention with a larger profile thickness arranged in the frame profile of Figure 1; Figure 6: a cross-section of a double-T-beam as a composite profile; Figure 7: a cross-section of a double-T-beam as a composite profile with different thicknesses of the plastic layer; Figure 8: a cross-section of a rectangular composite profile with rounded edges; Figure 9: a cross-section of a round composite profile; Figure 10: a cross-section of a composite profile with two surfaces curved in the same direction; Figure 11: a cross-section of a composite profile as in Figure 10 , but with only a two-edged core. DETAILED DESCRIPTION OF THE FIGURES

[0043] In the following, identical reference numerals refer to identical or functionally identical elements (in different figures). An additional apostrophe may serve to distinguish identical or functionally identical or functionally similar elements in a further embodiment.

[0044] In Figure 1A frame profile 13 of a window sash is shown according to the current state of the art. The frame profile 13 consists of an inner shell 15, an outer shell 17, and two insulating bars 12. The insulating bars 12 establish the connection between the inner shell 15 and the outer shell 17. The cross-section of the inner shell 15 and the outer shell 17 is formed by a rectangle. The two shells are arranged in such a way that their long sides are parallel and their widths are at the same height. The inner shell 15 and the outer shell 17 are designed as a lightweight construction using extruded profiles. Projections of various shapes are attached to the corners of the rectangular cross-sections, with the help of which the frame can either accommodate additional components or be attached to another component.The outer shell has an extension of the long side on its side facing away from the inner shell. The extension of this side projects beyond the corner point of the rectangle forming the cross-section, while maintaining the rectangular shape of the cross-section. On both the inner shell 15 and the outer shell 17, two pairs of bulges 19 are provided on the mutually facing sides, each forming a groove 21, 22. The grooves 21, 22 on the inner shell 15 and the outer shell 17 are at the same height. In the frame profile, these grooves 21, 22 serve to accommodate insulating bars 12. The insulating bars 12 are each arranged in opposite grooves 21, 22 of an inner shell 15 and an outer shell 17. The insulating webs 12 have a widening 18 at both ends, which can be received by the groove 21, 22 on the outer shell 17 or inner shell 15.This creates a positive connection between the insulating bar 12 and the inner 15 or outer shell 17.

[0045] The thickness of the insulating bar 12 is approximately equal to the wall thickness of the outer sides of the inner shells 15 and 17. The insulating bars 12 are arranged such that they are parallel but mirror-inverted to one another. The opposite sides of the insulating bars 12 also form the outer side of the frame profile 13. Projections are attached to the outer side of the insulating bars 12, which are similar to those on the inner shells 15 and 17. A crossbeam 23 is arranged approximately in the middle of the inner side of the insulating bar 12 and is perpendicular to the connecting line between the inner shells 15 and 17. The crossbeams 23 of both insulating bars 12 project from both sides into the middle of the frame profile 13 so that the distance between them is approximately as large as the thickness of one insulating bar 12.

[0046] In Figure 2A frame profile 13 is shown in which the insulating webs 12 between the inner shell 15 and the outer shell 17 are formed by composite profiles 11 according to the invention. The inner 15 and outer shell 17 have the same structure as in Figure 1The composite profiles 11 are composed of two different materials. The first material forms the core 25 of the composite profile 11. This is preferably made of a porous material. The core 25 is completely encased by a further material 27. The second material 27, on the one hand, accommodates the core 25 and, on the other hand, establishes the connection of the composite profile 11 to the inner 15 and outer shell 17. For the connection to the inner 15 and outer shell 17, notches 29 are provided on both flat sides at both ends, so that both ends of the composite profile 11 have a dovetail shape 18. These dovetail-shaped ends 18 of the composite profile 11 enable a positive connection to be made with the grooves 21 provided on the inner 15 and outer shell 17. Preferably, the projections are rolled into the grooves 21, 22. The composite profiles 11, like the insulating bars 12, are made of Figure 1directed parallel to each other. The core of the composite profile 25 has a rectangular cross-section, with a length several times its width. The core 25 is covered on its flat sides, which form the largest sides of the core, by a thin layer 27 of the second material. This layer 27 of the second material on the flat sides of the core is many times thinner than the thickness of the core 25. The dovetail-shaped ends 18 of the composite profile 11 are formed from the second material, so that the core 25 does not extend in the width direction of the composite profile 11 to the dovetail-shaped ends. The dovetail shape at the two ends of the composite profile is achieved by two notches 29 each, located at the same height but on opposite sides of the composite profile.

[0047] In Figure 3 is a frame profile 13 with a composite profile 11 as in Figure 2shown. However, the composite profile 11 has a different cross-section. The dovetail-shaped ends 18 of the composite profile 11 are arranged laterally offset from the central plane of the core 25. As a result, the opposite sides of the composite profiles 11 are flush with a groove 21 provided on the frame profile.

[0048] In contrast to Figure 2 In the arrangement of the frame profile 13 with the composite profiles 11 shown, the composite profiles have Figure 4Crossbeams 23. These are attached in the middle of the mutually facing sides of the composite profiles, so that the crossbeams 23 are perpendicular to the respective flat side of the composite profile 11. On the opposite flat sides of the composite profile 11, an additional projection 31 is attached approximately in the middle of both flat sides. This projection 31 has a T-shape and projects outwards so far that the projection 31 lies approximately flush with the projections on the frame profile 13. Both the projection 31 and the crossbeam 23 are formed by the second plastic 27, which encases the core 25.

[0049] In Figure 5The arrangement of the frame profile 13 known from the previous figures is shown, whereby in this embodiment the composite profiles 11 have a greater thickness. The greater thickness is reflected in the cross-section of the composite profiles 11 by a greater width. The change in the thickness of the composite profile 11 is achieved primarily by using a thicker core 25. The second plastic 27, on the other hand, has a slight increase in thickness. The thickness of the composite profiles 11 is selected such that the flat sides of the composite profiles are flush with the bulges 19 on the frame profile, which form the grooves 21, 22.

[0050] In Figure 6a cross-section of a double-T-beam is shown, which is formed from a composite profile 11. The double-T-beam consists of a web 33 and two flanges 35, 35', which are each attached to one end of the web 33 perpendicular to the latter. The web 33 has a greater thickness than the flanges 35, 35'. The ratio of the thickness of the flanges to that of the web is approximately 1 to 2. The core 25 of the composite profile 11, made of a porous, in particular foamed, material, forms the web 33 and the flanges 35, 35'. The core 25 is overmolded with a layer 27 of a plastic. This layer 27 has essentially the same wall thickness all around the core 25. The thickness of the second layer 27 is several times smaller, at least ten times smaller, than the thickness of the web 33 or the flanges 35, 35'. The edges of the double-T beam are rounded.The inner edges of the core are also rounded, whereas the outer edges of the core are rectangular.

[0051] Figure 7 shows a double-T beam, which has similar dimensions to the one in Figure 6 Here, too, the web 33 and the flanges 35, 35' are formed by a porous plastic, which forms the core 25 of the composite profile 11. In contrast to the core made of Figure 6 the core 25 in Figure 7 only has right-angled edges. The core 25, like the carrier, is made of Figure 6surrounded by a plastic layer 27. The plastic layer 27 has a greater wall thickness on the outward-facing surfaces of the core 25 than on the inward-facing surfaces of the core 25. This is one way to use the second plastic, which is mixed with glass fibers and forms the layer 27 surrounding the core 25, in accordance with the expected loads in the component. In this design, it is expected that greater forces will occur at those points where the plastic layer is thicker. At the interfaces between the thinner and thicker plastic layers, the thicker layer protrudes beyond the interface.

[0052] Figure 8shows a composite profile 11 having a rectangular cross-section with rounded edges. The shape of the composite profile 11 is determined by the core 25. The plastic layer 27 applied to the core 25 has a constant thickness, thus resulting in the shape of the composite profile 11 being determined by the core 25. In this embodiment, the thickness of the composite profile can be considered the width of the rectangular cross-section.

[0053] The Figure 9 shows a composite profile 11 with a circular cross-section. The core 25 is formed by a round rod. The outer surface of the core is surrounded by a second layer 27. The thickness of the second layer 27 is constant over the entire circumference of the cross-section. In this embodiment, the diameter of the circular cross-section can be considered the thickness.

[0054] The core 25 of the Figure 10The composite profile 11 shown comprises two curved flat sides and broad sides connecting these two flat sides. The two curved flat sides are curved to the same side. The curvature of the top side 37 is greater than that of the bottom side 39. This results in a varying thickness in the width direction of the profile 11. The core 25 has the greatest thickness in its center. The broad sides are aligned such that they run approximately parallel to one another. The core is surrounded by a plastic layer 27. The plastic layer 27 has the same wall thickness on both flat sides. At the corners of the core 25, the thickness of the second layer is increased so that the edges of the composite profile are not rounded but angled.

[0055] In Figure 11 is a composite profile similar to that of Figure 10 The composite profile in Figure 11 differs from that of Figure 10in that the top side 37 and bottom side 39 are not connected by two sides, but share two common edges. These two edges are the only edges of the core. In this design, the top side 37 also has a greater curvature than the bottom side 39, so that the core 25 has the greatest thickness in its center. The core 25 is surrounded by a plastic layer 27 that has the same thickness on both flat sides. At the edges of the core 25, the plastic layer 27 is arranged in such a way that an acute-angled edge is created.

[0056] A preferred manufacturing process for a composite profile according to the invention is described below: The first plastic is placed in a foamed mold. The first plastic can be produced in the desired shape during its production. Otherwise, the plastic must be post-processed to achieve the shape of the core of the composite profile to be formed. The second plastic is applied around the first plastic, which forms the core, in an extrusion process. In a suitable extrusion device, the core moves at a constant speed through the nozzle of the extrusion device during production and is overmolded up to the front and rear end faces of the profile.The extrusion process allows the temperature of the second plastic and the speed of the first plastic to be selected such that the first plastic is melted at the surface, creating a bond between the two plastics without causing plastic deformation of the first plastic. At the same time, this allows for a higher production speed compared to conventional manufacturing processes.

[0057] It is also conceivable that a connecting profile according to the invention is produced in a pultrusion process, ideally using glass fiber-filled epoxy resin, or a similar process, such as double belt pressing.

[0058] While specific embodiments have been described above, it is obvious that different combinations of the embodiments shown may be used, provided that the embodiments are not mutually exclusive.

[0059] While the invention has been described above with reference to specific embodiments, it will be obvious that changes, modifications, variations and combinations may be made without departing from the spirit of the invention. LIST OF REFERENCE SYMBOLS:

[0060] 11Composite profile 12Insulating web 13Frame profile 15Inner shell 17Outer shell 18Shaping / widening 19Convexity 21Groove on the inner shell 22Groove on the outer shell 23Crossbeam 25Core of the composite profile 27Cover of the core 29Notch 31Protrusion on the composite profile 33Web 35, 35'Flange 37Top of the core 39Bottom of the core

Claims

1. A composite profile (11) comprising a foamed core (25) made of a first plastic and an envelope (27) made of a second plastic enclosing the core (25), which envelops the core (25) in a form-fitting manner, wherein the first and the second plastic are compatible with one another, i.e. can enter into an integrally bonded connection with one another. characterised in that the first plastic (25) comprises PET.

2. The composite profile (11) according to claim 1, characterised in that a moulding (18) is provided at the end face on opposite sides of the composite profile (11), in order to enter into a form-fitting, force-fitting and / or integrally bonded connection, but preferably a form-fitting connection, with other parts.

3. The profile (11) according to claim 2, characterised in that the mouldings (18) are arranged on longitudinal sides of the composite profile (11).

4. The composite profile (11) according to any one of claims 1 to 3, characterised in that the moulding (18) from the second plastic is provided on opposite sides of the composite profile (11) in the form of a dovetail-shaped extension, a notch (29) or suchlike.

5. The composite profile (11) according to any one of claims 1 to 4, characterised in that the second plastic (27) encloses the lateral surface of the foamed core (25) .

6. The composite profile (11) according to any one of claims 1 to 5, characterised in that the composite profile (11) has a thickness of at most 40 mm, preferably of 25 mm.

7. The composite profile (11) according to any one of claims 1 to 6, characterised in that the second plastic (27) is mixed with short glass fibres.

8. The composite profile (11) according to claim 7, characterised in that the proportion of short glass fibres in the second plastic (27) is 10 % to 40 %, preferably 20 % to 30 %.

9. The composite profile (11) according to any one of claims 1 to 8, characterised in that the first plastic (25) has a density of 120 to 450 kg / m3, preferably of 150 to 350 kg / m3 and more preferably of 170 to 300 kg / m3.

10. The composite profile (11) according to any one of claims 1 to 9, characterised in that the second plastic (27) comprises PET or PET.

11. The composite profile (11) according to any one of claims 1 to 10, characterised in that the width of the composite profile is at least a four-fold, preferably at least a six-fold thickness of the composite profile.

12. The composite profile (11) according to any one of claims 1 to 11, characterised in that the foamed core (25) has a cross-section in the form of a flat rectangle and the second plastic (27) on the flat sides of the core has a thickness between 0.1 mm and 5 mm, preferably between 0.1 mm and 2 mm, particularly preferably between 0.1 mm and 1 mm.

13. A frame profile or wing profile (13) for windows or doors with a composite profile (11) according to any one of claims 1 to 12.

14. The frame profile or wing profile (13) according to claim 13, characterised in that the composite profile (11) is arranged between an outer shell (17) and an inner shell (15) of the window or of the door and preferably enters into a form-fitting connection with the outer shell (17) and inner shell (15) of the window or the door.

15. Frame profile or wing profile (13) according to any one of claims 13 to 14, characterised in that the mouldings (18) in the composite profile (11) enter into a form-fitting connection with the outer shell (17) and inner shell (15) of the window or the door.

16. A method for producing a composite profile (11), in which a core (25) is formed by a PET rigid foam and this core (25) is encapsulated with a fibre-reinforced plastic from PET or PBT, characterised in that the encapsulation of the core (25) with the fibre-reinforced plastic is carried out in an extrusion process.

17. The method according to claim 16, characterised in that, when the core (25) is encapsulated by the fibre reinforced plastic, an integrally bonded connection is brought about between these plastics.

18. The method according to claim 16 or 17, characterised in that the composite profile (11), after the production thereof, is anodised, powder-painted or wet-painted.