CN104105585A - Interior trim part and manufacturing method, especially for vehicle interior space - Google Patents

Abstract

The invention relates to an interior trim part for the interior of a motor vehicle, comprising a substrate (1) and a multilayer foil (3, 4) connected thereto, to a method for producing an interior trim part for the interior of a motor vehicle, to a multilayer foil (3, 4) and to the use of a multilayer foil (3, 4), wherein the multilayer foil (3, 4) comprises polypropylene (PP) or a polypropylene copolymer, wherein a foamed intermediate layer (2) is arranged between the substrate (1) and the multilayer foil (3, 4), wherein the elasticity of the intermediate layer (2) is greater than the elasticity of the multilayer foil (3, 4).

Description

Interior trim part and manufacturing method, especially for vehicle interior space

technical field

The invention relates to an interior trim part, in particular for the interior of a vehicle, a method for its production and a tool suitable therefor.

Background technique

The interior linings of motor vehicles are currently composed of a large number of shaped bodies which consist of or have a base which is responsible for the corresponding dimensional stability of the shaped bodies and absorbs the mechanical forces that occur. The substrate is often covered with a film to enhance the visual appearance in the interior area of the vehicle. In the past the film was usually a thicker "Injection Molded Surface Decoration" (IMD) film, however it was relatively expensive and/or not scratch resistant and/or very shiny (with values greater than eg 10 or greater than 20 or greater according to VDA standard 621-409 30 brilliance).

Contents of the invention

The object of the present invention is to provide a scratch-resistant interior trim part, in particular an interior lining part, for the interior of a motor vehicle, which does not have the disadvantages of the prior art, but has a pleasant feel and can be manufactured rationally.

This object is solved according to the invention in that the interior trim part has a rigid carrier, an elastic intermediate layer at least partially covering the carrier, and a film, in particular a multilayer film, at least partially covering the intermediate layer. According to the invention, the intermediate layer is foamed and preferably has greater elasticity through foaming.

The carrier can consist, for example, of fiber-reinforced or filled olefinic plastic and can be produced by injection molding, extrusion or the like. The intermediate layer is in particular physically or chemically foamed and advantageously consists of a thermoplastic elastomer such as TPE, TPE-E or TPE-S. Alternatively, it can be advantageously provided that the foamed intermediate layer consists of polyurethane foam, which is materially bonded to the film or multilayer film and/or the carrier, in particular by using an adhesion promoter. The film or multilayer film has a thickness of especially less than 750 μm, especially less than 500 μm and particularly preferably about 400 μm, more particularly preferably 150 μm to 250 μm. The film or multilayer film consists in particular of a thicker main layer and a thinner cover layer, which later forms the decorative surface of the interior part. For its part, the main layer can consist of one or more layers which consist, in particular, of polyolefin plastic and which are produced by coextrusion. The cover layer advantageously consists of a lacquer, for example polyurethane, which imparts the desired properties to the interior part with regard to scratch resistance, chemical resistance or glare.

The interior trim part according to the invention is advantageously produced according to a first embodiment variant by providing the film or multilayer film with an elastic intermediate layer beforehand, in particular during coextrusion. This achieves particularly good adhesion between the film or multilayer film and the intermediate layer. In addition, however, it is also conceivable, for example, to cover or spray foamed substances. The film or multilayer film provided with the intermediate layer is then subsequently provided with the support from the side of the intermediate layer, for example by pressing with a prefabricated support or by post-injection. By pressing the film or multilayer film against the grained or otherwise structured surface of a mould, the interior part acquires a surface structure (in-mold texturing).

The interior trim part according to the invention is advantageously produced according to a second embodiment variant by injection molding the carrier in the mold in the first cavity and arranging the film or multilayer film in the second cavity. The film or multilayer film can be inserted as a two-dimensional semi-finished product or already three-dimensionally formed. The mold advantageously has a core defining a first cavity, which is removed after injection molding of the carrier. The film or multilayer films can then be placed into spaced apart panels with the carrier retained in the mould. An elastic intermediate layer is then advantageously injected into this space, where it cools and/or reacts chemically. The pressure film or multilayer film produced from the intermediate layer is advantageously pressed onto the grained or otherwise structured surface of the second cavity and thus obtains a surface structure (in-mold texturing).

According to the invention, the shaped body or the substrate is coated with the film at least on one side. Foils are used here as films or as multilayer films which have a thickness of at most 750 μm. In particular, the film has a layer thickness of less than 500 μm, particularly preferably less than or approximately equal to 400 μm, very particularly preferably less than or approximately equal to 300 μm or in the range between approximately 300 μm and approximately 400 μm. This makes it possible to achieve considerable cost savings for the overall structural component by using very little material for the film or multilayer film and using lower-cost materials and/or production methods for the film.

It is particularly preferred according to the invention for the film to have, on its side facing away from the substrate (decorative side), a varnish or a lacquer layer previously applied to the film. The appearance of the interior part on the side (decorative surface) covered by the film can thus advantageously be varied in a particularly simple manner and adjusted by changing or adjusting the lacquer or the lacquer layer.

Furthermore, it is preferred according to the invention that the lacquer layer has a layer thickness of from about 1 μm to about 30 μm, preferably a layer thickness of from about 5 μm to about 20 μm, particularly preferably a layer thickness of about 10 μm or preferably a layer thickness of at most about 10 μm . The rest of the film preferably passes through multiple layers from a thickness of preferably approximately 300 μm (in the case of a total film thickness of, for example, 300 μm) to approximately approximately 400 μm (in the case of a total film thickness of, for example, 400 μm) A thin-film structure is formed, that is to say formed by a thin-film structure having at least one layer and a further layer. Alternatively, it may also be a multilayer film in the form of a so-called monofilm, that is to say a multilayer film comprising only one layer but consisting of several materials, or a multilayer film comprising several layers, but where the layers have the same material composition.

For the production of finished interior parts, in particular interior linings, especially vehicle interior linings, the film comprising the lacquer is connected to a plastic carrier or to a substrate, where according to the invention foaming is provided between the substrate and the multilayer film The intermediate layer, wherein the elasticity of the intermediate layer is greater than the elasticity of the multilayer film. It is either provided here that the film, together with the lacquer layer and the foamed intermediate layer, is placed in planar form, ie flat, into the mold for producing the inner lining, and then in a single production step by injection for the substrate The plastic material carries out the forming of the plastic carrier as well as the forming of the film comprising the lacquer layer and the foamed intermediate layer, wherein during this forming step at the same time also on the decorative side of the varnish or on the decorative side of the film So-called skin textures are produced, and these textures generally differ considerably from the finish of the surface of the lining part from about 0 μm to about 300 to 400 μm. For this production process with a single shaping step both for shaping the film and for shaping the plastic carrier, it is also alternatively possible according to the invention to process the film together with the varnish and the plastic carrier in the first shaping step. The foamed intermediate layer is shaped so as to come into contact with the plastic material of the plastic carrier only in a second shaping step (in the second mold). The production method is always a so-called in-mold texturing method (IMG method), in which a texturing can, but not necessarily, be provided in the paint layer or in the film layer of the inner lining. The method can relate to both injection molding methods (injection molding) and injection molding methods (transfer molding).

When the film (or multi-layer film) and the foamed intermediate layer are processed in the flat state and directly formed into the final shape, it can be provided that the film is heated before the shaping step, so that it can be shaped easily. An important advantage of the present invention is that the gathering of the material of the film (and the foamed intermediate layer) with the material of the substrate does not result in any damage to the film. Nevertheless the film still has to be shaped slightly so that it also matches the finesse of the mold structure. It is particularly important to avoid damage to the film due to the small thickness of the film during the setting or injection of the (liquid and heated, for example, to about 270° C.) plastic material for the carrier during injection molding. In the case of a deep-drawn film, that is to say a formed film, in the first step and forming it into the final shape together with the plastic material of the carrier only in the second forming step, usually no intermediary between film and foam is provided before the second forming step. layer heating. In this case, however, a sufficient stability of the film with the foamed intermediate layer must be ensured, especially in the case of agglomeration of the (particularly hot and under pressure) material with the carrier. About 95% of the final shape is generally formed during the deep drawing of the first method step.

Trimming or edge processing for single-stage forming of the film (with foamed intermediate layer) usually follows the forming step. Here, both the cutting step of the film and the packaging of the film can be carried out after the shaping step. In a two-stage production method (deep-drawing of the film in the first method step) according to the invention, a punching or cutting step of the film can be carried out between the first and the second forming step. In this case it is not necessary to carry out any post-processing of the structural part following the second forming step. However, it can also be provided that the cutting or punching step is carried out only after the second forming step.

The demoulding of the finished inner lining part with the attached film on its decorative surface takes place in all forming steps according to known techniques.

According to the invention many material systems or combinations of material systems are suitable for the interior lining or vehicle interior lining. The first combination of materials provides that the lacquer or lacquer layer provided on the decorative side of the film is a polyurethane lacquer, the multilayer film is a polypropylene copolymer multilayer film and the plastic carrier is a polypropylene plastic carrier, if necessary with fillers or reinforcements Such as fibers or similar materials, wherein the plastic carrier can also be a foamed material. In the case of another material combination for vehicle interior linings, the paint layer is a polyurethane paint layer, the film is likewise a polypropylene copolymer multilayer film with special adhesion promoters and the plastic material of the carrier is ABS and/or PC Materials (ABS=acrylonitrile butadiene styrene, PC=polycarbonate). Both the carrier material of polypropylene plastic and the carrier material of ABS or PC plastic are commercially available plastic materials to which, for example, up to 30% of glass fibers and or up to 30% of talcum powder are provided, wherein the two additional materials It is theoretically possible to add up to 50% and therein the real plastic component (that is to say the polypropylene component in the case of a polypropylene-based plastic carrier or the ABS/PC component for an ABS and/or PC-based plastic carrier) in any case All down are at least 50%.

It is therefore preferred according to the invention that the lacquer layer is provided on the basis of polyurethane and preferably comprises a thermoplastic or reactive two-component polyurethane system, or that the lacquer layer has a high scratch resistance and/or a high chemical resistance and/or a high UV resistance and/or high writing insensitivity (Schreibunempfindlichkeit), or the lacquer layer has a visually matte appearance (surface with special glare in the sense of a relatively small glare), and additionally has a soft-touch Grip impression (soft touch). The glare measurement here is carried out, for example, according to VDA621-409, wherein according to the invention in particular a glare equal to 0.5 or greater than 0.5 can be achieved, for example a glare of from about 0.5 to about 1.5 or from about 0.5 to about 4.0 or from A brilliance of about 1.5 to about 4.0. The scratch resistance is determined here, for example, using a so-called Erichsen needle, wherein the scratch resistance according to the invention can reach loads of up to 20 N according to the invention. Alternatively, the force strength is carried out with a so-called grid test, in which the so-called 5-L-value is measured using colorimetry (in the case of loads such as 5N, 10N and 15N). Alternatively, the scratch resistance is determined using the so-called five-finger test (needles with different loads from 2N to 25N) or according to the production standard BMW PA0015 or PA0016. According to the invention, it is possible to achieve atraumaticity (no visible force diagram due to damage to the surface) with an applied force of up to 7 N or even up to 15 N. Write insensitivity is determined according to the invention according to manufacturing standard GM9150P (General Motors) or LP-463/PB-5401 (Chrysler). With regard to chemical resistance, it is generally the usual chemical resistance according to different manufacturing standards to, inter alia, petrol, isopropanol, methanol and a series of commercially available "car cleaners". According to the invention, it is particularly preferred that the surface of the finished inner liner has a glare of less than about 1.5 (eg according to VDA621-409) and additionally has a scratch resistance of at least eg about 10N (according to the above test method).

The film is usually a multilayer film (that is to say the film has at least one layer and a further (different) layer, for example three or five layers in total (not counting the outer paint layer)), of which at least one The layers consist of polypropylene. In particular the further layer or layers are thermoplastic materials, particularly preferably polystyrene (PS) or PS copolymers, polyolefins, polyolefin copolymers or thermoplastic elastomers (TPE). Preferred thermoplastic elastomers are based on styrene copolymer component (TEP-S), ethylene/propylene-terpolymer (TPE-V), copolyester (TPE-E) or polyurethane (TPE-U) based thermoplastic elastomers. More particularly preferably, the further layer is a combination of at least two of the aforementioned thermoplastic materials and/or thermoplastic elastomers.

In particular, but not necessarily, the film has a composition consisting of polyethylene terephthalate (PET), polymethylmethacrylate (PMMA) or polycarbonate (PC) or at least two of these components. A layer composed of a mixture of species.

The individual layers of the film can be connected by suitable adhesion promoter layers in the case of coextrusion. Instead they can be covered together with an adhesive material.

In particular, the film has a decorative layer, which is particularly preferably applied by printing methods.

In a particularly preferred embodiment of the film it comprises polypropylene, especially PP-H (polypropylene homopolymer) or a PP copolymer. In order to obtain particularly good stability in the case of post-injection, at least in one layer or in another layer, a poly Propylene block copolymer (PP-BC). In addition, it contains less than 30% of the components of elastic material, thereby achieving formability and extensibility of the film. For this purpose thermoplastic elastomers are used, for example. In addition, the films may have minor constituents (generally less than 15%) of additives, such as color coatings, fillers, processing aids, and the like.

For the production of the film, the so-called sleeve method is used in particular for smoothing the film. In this case the polymer melt is guided between the metal belt and the cooling roll after being sprayed from the wide-mouth nozzle, so that the required Class A surface is obtained. The surface of the film essentially determines the quality of the lacquer layer to be applied on it with regard to its optical properties. Furthermore, the mechanical properties are improved in this way due to the small orientation and low crystallinity. In particular the deep drawability and formability are improved in this way and the film acquires greater toughness.

The substrate of the shaped body according to the invention is in particular a melt-processed (ie processed in the form of a melt) or alternatively a mat-shaped (ie processed in the form of a mat) thermoplastic material.

Materials processed especially in the melt are polypropylene (PP), acrylonitrile/butadiene/styrene (ABS), mixtures of ABS and polycarbonate (PC), polyamide (PA), thermoplastic elastomers (TPE) or thermoplastic elastomer based on natural rubber and/or polypropylene (PP). Furthermore, the melt-processed material consists in particular of a mixture of at least two of these materials.

Particular preference is given to materials processed in the melt having fillers. Examples of fillers are talc, chalk and wollastonite. Furthermore, the material processed in the melt can have reinforcements, for example glass fibres, natural fibres, carbon fibers or textile-type reinforcements, for example glass fiber mats or natural fiber mats, in order to increase its mechanical stability. Furthermore, preference is given to adding pore-forming, physical or chemical blowing agents or gas-loaded elastomer balls to the melt-processed material, for example.

The mat-like thermoplastic material has in particular fibers, such as natural fibers, glass fibers or carbon fibers, and a thermoplastic binder, such as polypropylene. The thermoplastic binder can be mixed with the rest of the fibers in the form of fibers or powder.

The interior lining or interior part of the invention is produced, for example, by injecting, extruding or die-casting thermoplastic material behind a film. In particular the post-injection is carried out as described in the patent specification DE 10 2005 039 600, which is hereby incorporated by reference and is therefore valid as part of the present disclosure.

The mat-like substrate is in particular preheated before it is joined to the film and then extruded or die-cast with said film in a forming tool.

The film, in particular as a 2D film, is optionally preheated or placed in a forming tool after previous shaping of the film, for example after deep drawing, and joined there to the substrate, for example by post-injection, post-extrusion or post-die-casting. The film is optionally cut to a suitable shape, for example by punching, before being placed in the forming tool.

The surface structure of the lining part according to the invention can be formed by a corresponding surface of the forming tool. The mold has both polished and textured surfaces, enabling the manufacture of liners with smooth or grained surfaces.

Description of drawings

Figure 1 shows exemplarily and schematically an embodiment of the invention.

Detailed ways

The illustrated interior part consists of a carrier 1 , an elastic middle layer 2 and a film which on its side has a main layer 3 facing the middle layer 2 and a cover layer 4 . The intermediate layer 2 consists of a foamed thermoplastic elastomer and is joined to the film beforehand, that is to say before joining to the carrier 1 , for example by coextrusion. Instead of this coextrusion for the production of a film or multilayer film provided with a foamed intermediate layer, it can also be provided according to the invention that the foamed thermoplastic elastomer (i.e. the foamed intermediate layer) be passed through the 1 and the gaps between the membranes are injected to connect them.

According to the invention, it is advantageously possible to achieve a so-called shallow soft behavior, that is to say both an IMG surface and a simultaneously soft feel (press-in softness). Preferably a very thin film (that is to say the film) is equipped with a foam back as a foamed middle layer in the in-line process (coextrusion), thereby producing very good adhesion between the layers and avoiding additional post-processing for setting the foam. deal with. Films thus provided with a foamed intermediate layer are textured in the in-mold texturing process. This results in a very uniform and clean surface structure, in which different structures or even strokes and symbols can be introduced. The film is then placed on a previously produced support, in particular from thermoplastics or from natural fibers or a combination of both, or the support is provided by post-injection in the direct process. Furthermore, so-called deep soft ground features can be realized according to the invention. This variant is based on the use of a very thin foil or a very thin film (for example 400 μm thick) instead of a film-like or skin-like decoration. The very thin film or the very thin film consists of the in particular coextruded main layer 3 represented in FIG. . The main layer is flexible and consists of one or more polyolefin layers; the cover layer consists of a lacquer, which is essentially responsible for very good surface properties, such as scratch resistance, chemical resistance or adjustable glare. The weight is greatly reduced by using this very thin film or film. Furthermore, the basis of the invention is that the soft part 2 or the foamed intermediate layer shown in FIG. Carrier 1 gave very good adhesion. The soft part 2 (or the foamed intermediate layer) can consist of TPE, TPE-E or TPE-S, which in particular can be foamed either chemically or physically; alternatively according to the invention, the soft part 2 ( That is to say the foamed middle layer) is realized as a PUR foam, which is preferably, but not necessarily, attached to the carrier and to the very thin foil by means of an adhesion promoter. Alternatively, the very thin, previously ungrained film can be embossed in a tool with a texture, which is provided on the mold surface, by means of the injection pressure and the high temperature of the soft part.

reference sign

1 carrier

2 Foamed middle layer

3 main floor

4 Overlays

Claims (52)

1. An interior part for an automobile interior space, comprising a substrate and a multilayer film connected to the substrate, wherein the multilayer film comprises polypropylene (PP) or a polypropylene copolymer, characterized in that the substrate and the multilayer A foamed intermediate layer is arranged between the films, wherein the elasticity of the intermediate layer is greater than that of the multilayer film. 2. Interior part according to claim 1, characterized in that the layer thickness of the multilayer film is less than or equal to about 750 μm, preferably less than or equal to about 500 μm, particularly preferably less than or equal to about 400 μm, or greater than or equal to about 300 μm and less than or equal to about 400 μm. 3 . The interior part as claimed in claim 1 , characterized in that the multilayer film has a lacquer layer on its side facing away from the substrate and the foamed intermediate layer. 4 . 4. Interior part according to claim 3, characterized in that the layer thickness of the paint layer is from approximately 1 μm to approximately 30 μm, preferably from approximately 5 μm to approximately 20 μm, particularly preferably approximately 10 μm. 5. Interior part according to claim 3 or 4, characterized in that the paint layer is provided on the basis of polyurethane, preferably comprising a reactive two-component polyurethane system. 6. Interior part according to claim 3, 4 or 5, characterized in that the paint layer has high scratch resistance and/or high chemical resistance and/or high UV resistance and/or high writing insensitivity sex. 7. The interior part as claimed in one of claims 3 to 6, characterized in that the varnish layer has a visually matte appearance and additionally has a soft-touch grip impression. 8. Interior part according to one of the preceding claims, characterized in that the multilayer film has a melt flow index (MFI, melt flow index) of less than or equal to 1 g/10min (230 ° C / 2.16 kg) of polypropylene or polypropylene. Propylene copolymers, wherein the polypropylene is preferably a polypropylene block copolymer (PP-BC). 9. Interior part according to claim 8, characterized in that the polypropylene or polypropylene copolymer (PP-BC) is mixed with a thermoplastic elastomer (TPE), wherein based on the mixture, the thermoplastic elastomer (TPE ) content is preferably less than or equal to 30%. 10. Interior part according to claim 7 or 8, characterized in that the further layer is a thermoplastic material, especially PS or PS copolymers, polyolefins, polyolefin copolymers; or a thermoplastic elastomer, especially TPE - S, TPE-V, TPE-E or TPE-U; or a combination of at least two materials. 11. Interior part according to one of claims 7 to 10, characterized in that the multilayer film has a cover layer, wherein the cover layer comprises PET, PMMA or PC or mixtures thereof. 12 . The interior trim part as claimed in claim 7 , characterized in that the layer and the further layer are connected to one another via an adhesion promoter. 13 . 13. Interior part according to one of the preceding claims, characterized in that the multilayer film has a decorative layer applied in a pressing method. 14. The interior part as claimed in claim 1, characterized in that the substrate is a thermoplastic material processed in the form of a melt or in the form of a mat. 15. Interior part according to claim 14, characterized in that the material processed in the melt is PP, ABS, ABS and PC, PA, TPE, TPV or a mixture of at least two of these materials. 16. The interior part as claimed in claim 14 or 15, characterized in that the material processed in the melt has fillers. 17. The interior part as claimed in claim 14, characterized in that the thermoplastic material processed in the form of a mat has fibers and/or a binder. 18. A method for producing an interior trim for an automobile interior, wherein the interior trim comprises a substrate and a multilayer film connected to the substrate, wherein the multilayer film has polypropylene (PP) or a polypropylene copolymer It is characterized in that a foamed intermediate layer is arranged between the substrate and the multilayer film, wherein the elasticity of the foamed intermediate layer is greater than the elasticity of the multilayer film, wherein the multilayer film and the foamed intermediate layer Manufactured in a coextrusion step. 19. The method for producing interior trim parts according to claim 18, characterized in that the layer thickness of the multilayer film is less than or equal to about 750 μm, preferably less than or equal to about 500 μm, particularly preferably less than or equal to about 400 μm, or greater than or equal to or within a range equal to about 300 μm and less than or equal to about 400 μm. 20. The method for producing interior trim parts according to claim 18 or 19, characterized in that the multilayer film has a lacquer layer on its side facing away from the substrate and the foamed intermediate layer. 21. The method for producing interior trim parts according to claim 20, characterized in that the layer thickness of the paint layer is from approximately 1 μm to approximately 30 μm, preferably from approximately 5 μm to approximately 20 μm, particularly preferably approximately 10 μm. 22. The method for producing interior trim parts according to claim 20 or 21, characterized in that the paint layer is provided on the basis of polyurethane, preferably comprising a reactive two-component polyurethane system. 23. The method for producing interior trim parts according to claim 20, 21 or 22, characterized in that the lacquer layer has high scratch resistance and/or high chemical resistance and/or high UV resistance and/or or high writing insensitivity. 24. The method for producing an interior trim part according to claim 20, characterized in that the lacquer layer has a visually matte appearance and additionally has a soft-touch grip impression. 25. The method for producing interior trim parts according to one of claims 18 to 24, characterized in that the multilayer film has a melt flow index (MFI, melt flow index) less than or equal to 1 g/10min (230°C/2.16 kg) of polypropylene or polypropylene copolymer, wherein the polypropylene is preferably a polypropylene block copolymer (PP-BC). 26. The method for producing interior trim parts according to claim 25, characterized in that the polypropylene or polypropylene copolymer (PP-BC) is mixed with a thermoplastic elastomer (TPE), wherein based on the mixture, the The thermoplastic elastomer (TPE) content is preferably less than or equal to 30%. 27. The method for producing interior trim parts according to one of claims 24 to 26, characterized in that the further layer is a thermoplastic material, especially PS or PS copolymers, polyolefins, polyolefin copolymers; or A thermoplastic elastomer, especially TPE-S, TPE-V, TPE-E or TPE-U; or a combination of at least two materials. 28. The method for producing interior trim parts according to claim 24, characterized in that the multilayer film has a cover layer, wherein the cover layer comprises PET, PMMA or PC or mixtures thereof. 29. The method for producing an interior trim part according to one of claims 24 to 28, characterized in that the layer and the further layer are connected to one another via an adhesion promoter. 30. The method for producing an interior trim part as claimed in one of claims 18 to 29, characterized in that the multilayer film has a decorative layer applied in a pressing process. 31. The method for producing an interior trim part according to claim 18, characterized in that the substrate is a thermoplastic material processed in the form of a melt or in the form of a mat. 32. The method for manufacturing interior trim parts according to claim 31, characterized in that the material processed in the form of a melt is PP, ABS, ABS and PC, PA, TPE, TPV or at least two of these materials mixture of species. 33. The method for producing an interior trim part according to claim 31 or 32, characterized in that the material processed in the melt has fillers. 34. The method for producing interior trim parts according to one of claims 31 to 33, characterized in that the thermoplastic material processed in the form of a mat has fibers and/or binders. 35. Multilayer film, wherein said multilayer film comprises polypropylene (PP) or a polypropylene copolymer, characterized in that said multilayer film is provided with a foamed middle layer, wherein said middle layer has an elasticity greater than The elasticity of the multilayer film. 36. The multilayer film according to claim 35, characterized in that the layer thickness of the multilayer film is less than or equal to about 750 μm, preferably less than or equal to about 500 μm, particularly preferably less than or equal to about 400 μm, or greater than or equal to about 300 μm and less than or equal to about 400 μm. 37. The multilayer film as claimed in claim 1, characterized in that it has a lacquer layer on its side facing away from the foamed intermediate layer. 38. The multilayer film according to claim 37, characterized in that the lacquer layer has a layer thickness of from about 1 μm to about 30 μm, preferably from about 5 μm to about 20 μm, particularly preferably about 10 μm. 39. Multilayer film according to claim 37 or 38, characterized in that the lacquer layer is provided on the basis of polyurethane, preferably comprising a reactive two-component polyurethane system. 40. Multilayer film according to claim 37, 38 or 39, characterized in that the lacquer layer has high scratch resistance and/or high chemical resistance and/or high UV resistance and/or high writing insensitivity sex. 41. Multilayer film according to one of claims 37 to 40, characterized in that the lacquer layer has a visually matte appearance and additionally has a soft-touch grip impression. 42. The multilayer film according to one of claims 35 to 41, characterized in that the multilayer film has a polypropylene with a melt index (MFI, melt flow index) less than or equal to 1 g/10min (230°C/2.16kg) Or a polypropylene copolymer, wherein the polypropylene is preferably a polypropylene block copolymer (PP-BC). 43. Multilayer film according to claim 42, characterized in that the polypropylene or polypropylene copolymer (PP-BC) is mixed with a thermoplastic elastomer (TPE), wherein based on the mixture, the thermoplastic elastomer (TPE ) content is preferably less than or equal to 30%. 44. Multilayer film according to claim 41 or 42, characterized in that the additional layer is a thermoplastic material, especially PS or PS copolymers, polyolefins, polyolefin copolymers; or a thermoplastic elastomer, especially TPE - S, TPE-V, TPE-E or TPE-U; or a combination of at least two materials. 45. The multilayer film as claimed in one of claims 41 to 44, characterized in that the multilayer film has a cover layer, wherein the cover layer comprises PET, PMMA or PC or mixtures thereof. 46. Multilayer film according to one of claims 41 to 45, characterized in that the layer and the further layer are connected to one another via an adhesion promoter. 47. The multilayer film as claimed in one of claims 35 to 46, characterized in that it has a decorative layer applied in a pressing process. 48. Multilayer film according to one of claims 35 to 47, characterized in that the substrate is a thermoplastic material processed in the form of a melt or in the form of a mat. 49. Multilayer film according to claim 48, characterized in that the material processed in the melt is PP, ABS, ABS and PC, PA, TPE, TPV or a mixture of at least two of these materials. 50. Multilayer film according to claim 48 or 49, characterized in that the material processed in the melt has fillers. 51. The multilayer film as claimed in one of claims 48 to 49, characterized in that the thermoplastic material processed in the form of a mat has fibers and/or binders. 52. Use of the multilayer film according to one of claims 35 to 51, in particular for producing an interior part for the interior of a motor vehicle, wherein the interior part has a substrate, which is bonded to the multilayer film, Wherein the multilayer film comprises polypropylene (PP) or a polypropylene copolymer, it is characterized in that a foamed intermediate layer is arranged between the substrate and the multilayer film.