Method for manufacturing a vehicle trim part with a visible speckled and / or marbled pattern, vehicle trim part with a visible speckled and / or marbled pattern, device for simultaneously printing multiple lines on a flat or curved surface to form a marbled pattern, and device for printing multiple different shapes on a flat or curved surface to form a speckled pattern

Abstract

The present disclosure relates, inter alia, to a method for manufacturing a vehicle trim part with a visible speckled and / or marbled pattern on an externally visible side of the vehicle trim part, comprising the following steps: providing an injection mold with a first mold half and a second mold half that are movable relative to each other between an open and a closed position of the injection mold, wherein the injection mold, in the closed position, forms a cavity between the first and the second mold half; injecting a plastic melt into the cavity; curing the injected plastic melt to form the vehicle trim part; removing the vehicle trim part by opening the injection mold;wherein, prior to the injection of the plastic melt into the cavity, plastic elements are provided and arranged on a cavity surface in such a way that the plastic elements bond materially with the injected plastic melt during injection and / or curing and form a speckled and / or marbled pattern on the visible side of the vehicle trim part.

Description

The present disclosure relates to a method for manufacturing a vehicle trim part having a visible speckle and / or marmoering pattern, a vehicle trim part having a visible speckle and / or marmoering pattern, an apparatus for simultaneously printing a plurality of lines on a planar or curved surface to form a marmoering pattern, and an apparatus for printing a plurality of different shapes on a planar or curved surface to form a speckle pattern.It may be desirable to provide parts, for example vehicle trim parts, particularly for motor vehicles, with a speckle and / or marmoering pattern. For example, the choice of recycled or sustainable materials in the manufacture of the parts can be made visible to the customer.In order to provide a vehicle trim part having a desired design, an in-mold decoration (IMD) or in-mold decoration label (IMD) method is generally used, in which a film containing the design is placed in an injection mold and the design is subsequently transferred to an injection molded part with (IMD) or without (IMD) the film. However, these technologies have the drawback of high costs and, above all, of poor sustainability. Other methods, in contrast, using direct printing tools, such as fused filament fabrication or injection, may also be expensive. On the other hand, processes which already contain a raw material premixed according to the desired pattern regularly show an at least aesthetically unsatisfactory result in the finished part.It is therefore an object of this disclosure to provide an alternative and less expensive method of making a vehicle trim part having a visible speckle and / or marmoering pattern, an alternative and less expensive vehicle trim part having a visible speckle and / or marmoering pattern, an alternative and less expensive apparatus for simultaneously printing multiple lines on a planar or curved surface to form a marmoering pattern, and an alternative and less expensive apparatus for printing multiple different shapes on a planar or curved surface to form a speckle pattern.This object is achieved by a respective method, a respective vehicle trim part and two respective different devices according to the independent claims. Further embodiments of the invention are shown in the dependent claims, the figures and the following description.The proposed method for producing a vehicle trim part with a visible speckle and / or marmoering pattern on a visible side of the vehicle trim part from the outside comprises the stepsproviding an injection mold having a first mold half and a second mold half movable relative to each other between an open and a closed position of the injection mold, wherein the injection mold forms a cavity between the first and the second mold half in the closed position;injecting a plastic melt into the cavity;curing the injected plastic melt to form the vehicle cladding part;removing the vehicle trim part by opening the injection mold;wherein prior to injecting the plastic melt into the cavityplastic elements are provided and arranged on a cavity surface in such a way that the plastic elements connect to the injected plastic melt in a materially integral manner during injection and / or curing and a speckle and / or marmorie pattern is formed on the visible side of the vehicle cladding part.By applying the desired pattern directly on the cavity surface, the corresponding vehicle trim part can be produced particularly cost-effectively.The vehicle trim part can be a vehicle trim part or a vehicle exterior trim part. The vehicle trim part may be a decorative trim or a panel part. In the finished vehicle trim part, the plastic elements and the material of the injected plastic melt are joined together to form one piece by their material connection.A vehicle trim part with a visible side visible from the outside is understood in the present case to be a vehicle trim part whose visible side can be viewed by a user of the vehicle without destruction or removal of the vehicle trim part when used as intended, for example in a passenger interior. Depending on the light transmission of the vehicle trim part, its visible side can comprise only the visible outer surface of the vehicle trim part or additionally also the visible interior of the vehicle trim part. If, for example, a transparent or translucent material is used for the injected plastic melt, the visible speckle and / or marmoering pattern can comprise a projection of the plastic elements from the interior of the vehicle cladding part in the direction of the visible side. Accordingly, the plastic elements may be arranged on an inner side of the vehicle trim part facing in a direction substantially opposite to the visible side and / or on an inner side of the vehicle trim part facing in substantially the same direction as the visible side.In the present case, speckle pattern is understood to mean a pattern which, for example, forms an at least apparently random distribution of speckle-like speckle elements on the visible side of the vehicle cladding part. The speckle elements can form round, e.g. circular, or angular regions which are visually delimited from the surrounding material. Such speckle patterns are regularly associated with the use of a sustainable material or a sustainable material mixture or recyclable or recycled materials.In the present case, a marmoering pattern is understood to mean a pattern which, on the visible side of the vehicle cladding part, forms an at least apparently random distribution of curved, partially closed line elements which run parallel at least in sections and can resemble the contour lines of a mountain profile, for example. Such samples are found, for example, in Cipolino-Marmor or are formed when a color mixture is mixed in. Such marmoering patterns are regularly associated with the use of a sustainable material or a sustainable material mixture or recyclable or recycled materials.The cavity surface on which the plastic elements are arranged can substantially comprise a surface of the first mold half and / or of the second mold half facing the vehicle trim part to be produced. The respective surface of the first mold half can be a surface which points substantially in the direction opposite the visible side. The respective surface of the second mold half may be a surface facing substantially in the same direction as the visible side of the vehicle trim part to be manufactured. Accordingly, the plastic elements in the resulting vehicle trim part can be arranged on an inner side of the vehicle trim part which is substantially opposite the viewing side and / or-in particular when using a transparent or translucent material for the injected plastic melt-on an inner side of the vehicle trim part which is substantially in the same direction as the viewing side. The plastic elements and the injected plastic melt can be arranged essentially directly, i.e. without intermediate layer or intermediate material, adjacent to the cavity surface. The plastic elements may be provided and arranged on the cavity surface while the injection mold is in its open position.The plastic elements can form a macroscopic speckle and / or marmorie pattern on the visible side of the vehicle cladding part, which pattern is visible with the naked eye, e.g. within distances customary in a passenger compartment. In this example, the usual distances may comprise a range between 30 cm and 3 m. In particular, a minimum visible extent of individual geometric elements of the speckle and / or marmoering pattern, e.g. an average diameter of individual speckle spots or an average line width of individual marmoering lines, may be on average at least 0.1 mm, at least 0.5 mm or at least 2 mm and on average at most 5 mm, at most 10 mm or at most 15 mm. The pattern can differ in color from the injected plastic melt, in particular can be visibly different. The pattern may be single or multi-colored. Individual pattern elements may be provided by individual plastic elements or by a plurality of adjacent plastic elements. A combination of a speckle and / or marmoering pattern or different regions with in each case a speckle and / or marmoering pattern can be provided on the vehicle cladding part.The plastic elements arranged on the cavity surface can be heated before the injection of the plastic melt into the cavity. The heating of the plastic elements can be effected by directly heating the plastic elements and / or by heating the first mold half and / or the cavity, for example by blowing in hot air, thermal resistance heating, induction heating or heating with UV lamps. The heating, in particular the heating of the cavity surface, can take place before, during and / or after the provision and arrangement of the plastic elements on the cavity surface. Additionally or alternatively, the plastic elements arranged on the cavity surface can be pressed against the cavity surface by means of a pressing device, in particular a hot pressing device. The pressing device can be provided, in particular on its side facing the cavity surface during pressing, with an anti-stick coating which prevents adhesion of the plastic elements to the pressing device. By heating and / or pressing the plastic elements, these can be deformed such that their depth of extension into the vehicle trim part, measured along a surface normal of the vehicle trim part, is 100%, at most 80%, at most 50% or at most 30%. The deformation can lead to the extent of the plastic elements along the surface normal decreasing to up to 80%, 50% or 30% of their original size. Additionally or alternatively, by pressing the plastic elements, a homogeneous and in particular planar surface of the plastic elements facing the pressing device can be created. Additionally or alternatively, the heating and / or pressing of the plastic elements can lead to an improved connection or adhesion of the plastic elements to or on the cavity surface, in particular during the injection of the plastic melt into the cavity and / or during the curing of the injected plastic melt. Additionally or alternatively, by heating and / or pressing the plastic elements, a deformation and / or at least partial overlapping and / or mixing of adjacent pattern elements can be provided. Additionally or alternatively, a cohesive connection between adjacent plastic elements can be provided by heating and / or pressing. For heating and / or pressing the plastic elements, the plastic elements and / or the cavity surface and / or the pressing device can be brought to a temperature of at least 60° C., at least 100° C., at least 140° C. or at least 150° C., in particular depending on the glass transition or melting temperature of the plastic elements.The plastic elements can comprise or consist of a thermoplastic, in particular a recycled thermoplastic. The plastic elements may for example comprise or consist of polypropylene or recycled polypropylene. Alternatively or additionally, the plastic elements can comprise polylactide and / or recycled polylactide, but also polyethylene terephthalate, acrylonitrile butadiene styrene, acrylonitrile styrene acrylate and / or their recycled counterparts or consist thereof. The totality of the plastic elements and / or individual plastic elements can be single-, two- or multi-coloured, it also being possible for pearlescent or glossy element surfaces to be provided. The injected plastic melt may comprise or consist of a thermoplastic or a recycled thermoplastic. The injected plastic melt may comprise or consist of polypropylene, poly(methyl methacrylate), polycarbonate, polystyrene and / or acrylonitrile butadiene styrene. The injected plastic melt can consist at least partially of a transparent or translucent material. In particular, the material of the plastic elements and the material of the injected plastic melt should be selected such that they are compatible with one another so that a cohesive connection is formed between the plastic elements and the injected plastic melt during the injection and / or curing. The plastic elements and / or the injected plastic melt can consist of a monomaterial, i.e. of a single pure material. In addition, additives, in particular binders, can be added to or contained in the plastic elements and / or the injected plastic melt, so that a connection between individual plastic elements and / or between the plastic elements and the injected plastic melt is improved. In addition, the additives can also improve adhesion between the plastic elements and the cavity surface.The plastic elements can consist of or contain solid plastic particles, plastic granules, plastic powders, plastic filaments and the like. The plastic elements may comprise a preformed design pattern. Depending on the step of providing and arranging the plastic elements on the cavity surface, a plastic raw material can be used which, in addition to molten plastic, also consists of or comprises solid plastic particles, plastic granules, plastic powder, plastic filaments and the like. The provision and arrangement of the plastic elements on the cavity surface can be effected manually or mechanically, for example by means of a metering device, spraying, sieving, filtering, brushing, punching and in particular by granulate extrusion or fused filament fabrication. Along the surface normal of the cavity surface, which faces the vehicle trim part to be produced, the plastic elements can be arranged essentially in a single layer or at least partially stacked one above the other. The plastic elements and / or the plastic raw material can be substantially flat or extended in all three spatial directions. Depending on the method, the desired pattern, for example with regard to the distribution and arrangement of the individual pattern elements, can be predetermined in some cases arbitrarily, but at least with regard to the mean extent and density of the plastic elements visible on the visible side of the vehicle trim part to be produced. Alternatively, the desired pattern can also be predefined with respect to the distribution and arrangement of the individual pattern elements.As described here, the elements provided and arranged on the cavity surface are plastic elements which consist at least partially of plastic. Additionally or alternatively, these elements may be made of or comprise other materials, e.g. metal and / or wood. For the plastic elements, material mixtures or composite materials of plastic and metal or wood can be used in particular. The respective elements can alternatively also be connected in a form-fitting manner to the injected plastic melt, in particular if they are porous elements.The provision and arrangement of the plastic elements on the first mold half can be effected by at least one die, in particular by granulate extrusion, for example with the aid of a hot runner, or by fused filament fabrication of plastic raw material. In granulate extrusion, the plastic raw material may consist of plastic granulate and in fused filament fabrication the plastic raw material may be a plastic filament. In the granulate extrusion using a hot runner, a conduit leading molten plastic raw material to the die and / or the die may have a heat insulating coating to maintain the desired temperature of the plastic melt of the raw material. The coating can be applied to conduit and / or nozzle surfaces which come into contact with the plastic melt of the raw material. When arranging the plastic elements with at least one nozzle, the at least one nozzle can be moved along the cavity surface. Alternatively or additionally, however, the cavity surface can also be moved relative to the at least one nozzle. In order to obtain different shapes of the individual pattern elements, differently shaped nozzle cross sections can be used. Corresponding nozzles are generally known. They are characterized by a nozzle inlet for receiving and a nozzle outlet for dispensing a material, wherein the dispensing takes place substantially along a nozzle main axis. The cross section of the dispensed material is essentially predefined by the nozzle cross section, which defines a shape running essentially perpendicular to the main nozzle axis. In the following, the terms nozzle main axis and nozzle cross section are used accordingly.According to an embodiment of the method in which the plastic elements are provided and arranged by means of at least one nozzle, a plurality of plastic elements can be provided and arranged simultaneously on the cavity surface by using a plurality of nozzles arranged side by side. This may be particularly suitable for producing a marmoering pattern. The nozzles can be arranged substantially in a plane, in particular in a plane parallel to the cavity surface. The nozzles may be arranged such that their major axes are substantially parallel. Depending on the pattern, the nozzles can be arranged substantially linearly or in a pack which is as compact as possible in all directions. Depending on the pattern, the nozzles can be moved individually or jointly along the side of the cavity surface and / or rotated about a nozzle main axis and / or fed with the plastic raw material and / or provided with different nozzle cross sections, whereby e.g. different line distances of individual adjacent lines, wavy lines, dashed lines and different line colors or different line shapes are produced.According to an alternative embodiment of the method, in which the plastic elements are provided and arranged by means of at least one nozzle, a cartridge with differently shaped through holes can be provided and arranged between the nozzle and the cavity surface. The through holes may be selectively aligned with the nozzle along a nozzle major axis so that differently shaped plastic elements corresponding to the through holes are provided and disposed on the cavity surface. This may be particularly suitable for producing a speckle pattern with numerous different shaped speckles of a predetermined shape.Alternatively to the direct provision and arrangement of the plastic elements on the cavity surface by the at least one nozzle, a pattern of plastic elements can be preformed by the at least one nozzle on any working surface and then transferred to the cavity surface.With regard to further features of the method steps just described using a plurality of nozzles or a cartridge, reference is made to the devices described further below and vice versa. These are not limited thereto, but are particularly well suited for carrying out the corresponding method steps in the production of a vehicle cladding part with speckle and / or marmoering patterns.The injection of the plastic melt can be effected through one or more injection channels which can be arranged in the first mold half and / or in the second mold half. The injection of the plastic melt can take place substantially along the direction of the gravitational acceleration or perpendicular thereto, depending on the arrangement of an injection device. During the provision and arrangement of the plastic elements on the cavity surface, the cavity surface is generally arranged substantially horizontally, i.e. in a plane perpendicular to the direction of the gravitational acceleration. Therefore, when plastic elements are provided on the first and second mold halves and / or when the injection of the plastic melt is performed in a direction perpendicular to the direction of gravitational acceleration, the method may comprise the step of rotating the first mold half and / or the second mold half and / or the cavity at least before the injection of the plastic melt. It may be advantageous if the above-described optional step of heating and / or pressing is carried out beforehand. The injected plastic melt can be cured by cooling, in particular by passive or active cooling of the first and second mold halves, in particular on the two surfaces of the mold halves facing the vehicle cladding part to be produced, depending on the material of the injected plastic melt.In addition, a vehicle trim part with a visible speckle and / or marmoering pattern is proposed. The vehicle trim part has a visible side visible from the outside and comprises plastic elements which are arranged in an injection-molded plastic and are connected thereto in a materially bonded manner such that a visible speckle and / or marmoering pattern is formed on the visible side.Since the plastic elements forming the pattern are arranged in the injection-molded plastic and are connected thereto in a materially integral manner, in principle more cost-effective methods can be used for their production than, for example, the IML and IMD methods described above.In particular, the vehicle trim part can be a vehicle trim part which can be produced or has been produced by one of the methods described above.The plastic elements can comprise or consist of a thermoplastic, in particular a recycled thermoplastic. The plastic elements may for example comprise or consist of polypropylene or recycled polypropylene. Alternatively or additionally, the plastic elements can comprise polylactide and / or recycled polylactide, but also polyethylene terephthalate, acrylonitrile butadiene styrene, acrylonitrile styrene acrylate and / or their recycled counterparts or consist thereof. In particular, the plastic elements can consist of a monomaterial. The totality of the plastic elements and / or individual plastic elements can be single-, two- or multi-coloured, it also being possible for pearlescent or glossy element surfaces to be provided. The injected plastic may consist of or comprise a thermoplastic or a recycled thermoplastic. The injection molded plastic may consist of or comprise polypropylene, poly(methyl methacrylate), polycarbonate, polystyrene and / or acrylonitrile butadiene styrene. In particular, the injection-molded plastic can consist of a monomaterial. The injected plastic can consist at least partially of a transparent or translucent material.The depth of extension of the plastic elements into the vehicle trim part, measured along a surface normal of the vehicle trim part, can be 100%, at most 80%, at most 50% or at most 30%. Additionally or alternatively, the extension depth may be not less than 1%, not less than 5%, not less than 10% or not less than 20%. An average extension depth of the plastic elements may be 30%.The vehicle trim part can be a vehicle trim part or a vehicle exterior trim part. The vehicle trim part can be a decorative trim or panel part, in particular as part of a door trim, a central console, a front console or a roof panel or the like. The vehicle trim part can be a trim part with a substantially planar or curved visible side.Also proposed is an apparatus for simultaneously printing a plurality of lines on a flat or curved surface to form a mark pattern. The apparatus comprises a plurality of nozzles configured to provide and arrange plastic elements on the surface. The nozzles are arranged next to one another and can be moved individually or jointly along the surface and / or can be rotated about a main nozzle axis and / or can be fed with the plastic raw material and / or is provided with different nozzle cross sections.Since the apparatus has a plurality of nozzles capable of printing simultaneously, the total cost of a printing operation performed by the apparatus can be reduced.The nozzles may be arranged for printing by means of granulate extrusion, e.g. using a hot runner, or fused filament fabrication of plastic raw material. The nozzles may be arranged in a common movable print head for feeding and controlling the nozzles. The print head can be movable in all six degrees of freedom. The nozzles can be arranged movably in the print head in such a way that a movement of the print head leads to a global movement of all nozzles and the movement of individual nozzles leads to their movement relative to one another. The nozzles can be arranged substantially in a plane, in particular in a plane parallel to the surface. The nozzles may be arranged such that their major axes are substantially parallel. The nozzles can be arranged substantially linearly or in a pack which is as compact as possible in all directions. The shortest distance between two adjacent nozzles, in particular at right angles to the main nozzle axis, can be a maximum of 0 mm, 0.1 mm, 1 mm or 10 mm.Finally, an apparatus for printing a plurality of different shapes on a planar or curved surface to form a speckle pattern is proposed. The device comprises a die arranged for providing and arranging plastic elements on the surface, in particular by granulate extrusion or fused filament fabrication of plastic raw material, and comprises a cartridge with differently shaped through holes arranged between the die and the surface. The through holes are selectively alignable with the nozzle along a nozzle major axis.Because the device includes a cartridge disposed between the nozzle and the surface, wherein differently shaped through holes may be aligned with the nozzle major axis to print different shapes, the overall cost of a printing process performed with the device may be reduced.The through holes may be radially distributed about an axis of rotation of the cartridge, the cartridge being rotatably supported about the axis of rotation to align the through holes with the nozzle main axis. The axis of rotation of the cartridge and the main nozzle axis can run parallel to one another and spaced apart from one another. The shapes of the through-holes may be defined by a cross-section of the through-holes substantially perpendicular to the axis of rotation and / or substantially perpendicular to the nozzle main axis. The various shapes of the through-holes may be substantially circular and / or angular. The cross section of at least one or all of the through holes at an end of the through hole facing the nozzle may have a largest diameter which is substantially equal to and / or smaller than the largest diameter of the nozzle cross section at an end of the nozzle facing the cartridge. The cross section of at least one or all of the through-holes may taper towards an end of the through-hole facing away from the nozzle. The cartridge can be arranged adjacent to the nozzle, in particular directly adjacent to it. The minimum distance between the cartridge and the nozzle, measured along the nozzle main axis, can be a maximum of 0 mm, 0.1 mm or 0.5 mm. The cartridge can be shaped as a substantially flat disk, wherein the axis of rotation optionally corresponds to the principal axis of inertia running along the surface normal of the disk base surface.In particular, the device for simultaneously printing a plurality of lines on a planar or curved surface to form a marmoering pattern and the device for printing a plurality of different shapes on a planar or curved surface to form a speckle pattern are suitable for providing a speckle and / or marmoering pattern on a vehicle trim part or for use with the method described above.The methods, articles and devices presented herein relate to a speckle and / or marmoering pattern. However, it is clear to the skilled person that in principle other patterns are also conceivable.Several embodiments have been disclosed herein. From the following detailed description showing and describing embodiments of the invention, further embodiments of the present invention will become apparent to one skilled in the art. Accordingly, the drawings and detailed description are to be regarded as exemplary in nature, but not as restrictive. Repeating features are marked with the same reference numerals in the description of the figures. FIG. 1 shows the step of providing an injection mold according to an embodiment of a method for producing a vehicle trim part having a visible speckle and / or marmoering pattern, FIG. 2 shows the step of providing and arranging plastic elements according to the method, FIG. 3 shows the step of injecting a plastic melt according to the method, FIG. 4 shows the step of removing the vehicle trim part according to the method, FIG. 5 shows an example vehicle trim part having a speckle pattern, FIG. 6 shows an example vehicle trim part with a marmoering pattern, FIG. 7 shows a first alternative embodiment of the vehicle trim part which has been produced according to a first alternative embodiment of the method, FIG. 8 shows a second alternative embodiment of the vehicle trim part that was produced according to a second alternative embodiment of the method, FIG. 9 shows the step of heating and pressing the plastic elements according to a third alternative embodiment of the method, FIG. 10 shows a first embodiment of an apparatus for simultaneously printing a plurality of lines on a flat or curved surface to form a mark pattern, FIG. 11 shows a marmoering pattern produced on a surface by the apparatus of FIG. 10, FIG. 12 shows a second embodiment of an apparatus for simultaneously printing a plurality of lines on a flat or curved surface to form a mark pattern, FIG. 13 shows the device from FIG. 12 with a rotating nozzle, Fig. 14 shows a first embodiment of an apparatus for printing a plurality of different shapes on a flat or curved surface to form a speckle pattern, FIG. 15 shows a speckle pattern produced on a surface by the apparatus of FIG. 14, FIG. 16 shows the cartridge of the device from FIG. 14, and Fig. 17 shows the cartridge of a second embodiment of an apparatus for printing a plurality of different shapes on a flat or curved surface to form a speckle pattern.Reference will now be made to specific figures only when substantial differences between the exemplary embodiments are explained.FIGS. 1 to 4 schematically show an embodiment of a method for producing a vehicle trim part 10; 10'; 10" with a visible speckle and / or marmoering pattern 1; 2 on a visible side 11 of the vehicle trim part 10; 10'; 10", which is visible from the outside. The exemplary method comprises a first step (FIG. 1 ) of providing an injection mold 100 having a first mold half 110 and a second mold half 120 that are movable relative to one another between an open and a closed position of the injection mold 100, wherein the injection mold 100 forms a cavity 130 between the first mold half 110 and the second mold half 120 in the closed position. In a second step (FIG. 2 ), plastic elements 150 are provided and arranged on a cavity surface. In a third step (FIG. 3 ), a plastic melt 140 is injected into the cavity 130, where it cures, for example by passive or active cooling, to the vehicle trim part 10; 10'; 10", which is finally removed by opening the injection mold 100 (FIG. 4 ). The plastic elements 150 are provided and arranged on the first mold half 110 in such a way that the plastic elements 150 connect to the injected plastic melt 140 in a materially integral manner during injection and / or curing and form a speckle pattern 1 or marmoering pattern 2 on the visible side 11 of the vehicle cladding part 10; 10'; 10".By applying the desired pattern directly to the cavity surface, the corresponding vehicle trim part 10; 10'; 10'' can be produced particularly cost-effectively. At the same time, the use of sustainable and / or recycled materials can be visualized, in particular with the possibility of providing the desired pattern as simply and precisely as possible. A further advantage is the flexibility of the method. Thus, for example, size restrictions for the plastic melt can be avoided, as would exist with a plastic melt premixed with plastic elements.The steps illustrated in Figures 1, 3 and 4 are well known. Specific examples of how the plastic elements 150 are provided and arranged according to the second step schematically illustrated in FIG. 2 will be discussed in more detail below.The vehicle trim part 10; 10'; 10" may be a vehicle trim part or an exterior vehicle trim part. The vehicle trim part 10; 10'; 10" can be a decorative trim or panel part. In the finished vehicle cladding part 10; 10'; 10'', the plastic elements 150 and the material of the injected plastic melt 140 are integrally connected to one another by their material-bonded connection.FIGS. 5 and 6 show two exemplary vehicle trim parts 10 in a vehicle interior with a speckle pattern 1; 2. the respective vehicle trim parts 10 can be produced with the methods described here.The cavity surface on which the plastic elements 150 are arranged can substantially comprise a surface of the first mold half 111 facing the vehicle trim part 10 to be produced or a surface of the second mold half 121. According to the method illustrated in FIGS. 1 to 4, the plastic elements 150 are arranged on the surface of the first mold half 111 which points in a direction substantially opposite to the visible side 11 of the vehicle trim part 10 to be produced. Accordingly, in the vehicle trim part 10 illustrated in FIG. 4, the resin members 150 are disposed on an inner side of the vehicle trim part 10 facing in a direction substantially opposite to the visible side 11. According to a first alternative embodiment of the method, the cavity surface on which the plastic elements 150 are arranged may substantially comprise the surface of the second mold half 121 which points substantially in the same direction as the visible side 11 of the vehicle trim part 10', which is to be produced. Accordingly, as shown in FIG. 7, the resin members 150 are disposed on an inner side of the vehicle trim 10' facing substantially the same direction as the visible side 11. According to a second alternative embodiment of the method, the cavity surface on which the plastic elements 150 are arranged may substantially comprise the surface of the first mold half 111 facing substantially in the direction opposite the visible side 11 and the surface of the second mold half 121 facing substantially in the same direction as the visible side 11 of the vehicle trim part 10" to be produced. Accordingly, as shown in FIG. 8, the plastic elements 150 are arranged on an inner side of the vehicle trim part 10" which points substantially in the direction opposite to the visible side 11 and on an opposite inner side of the vehicle trim part 10" which points substantially in the same direction as the visible side 11. The two latter embodiments of the vehicle cladding part 10', 10'' are advantageously provided with a transparent or translucent material for the injected plastic melt 140. The plastic elements 150 and the injected plastic melt 140 are arranged essentially directly, i.e. without intermediate layer or intermediate material, adjacent to the cavity surface. The plastic elements 150 may be provided and disposed on the cavity surface while the injection mold 100 is in its open position.The plastic elements 150 can form a macroscopic speckle and / or marmoering pattern 1; 2 on the visible side 11 of the vehicle cladding part 10; 10'; 10'', for example as illustrated in FIGS. 5 and 6, which is visible with the naked eye, for example at distances customary in a passenger interior. In this example, the usual distances may comprise a range between 30 cm and 3 m. In particular, a minimum visible extension of individual geometric elements of the speckle and / or marmoering pattern 1;2, e.g. an average diameter of individual speckle spots or an average line width of individual marmoering lines, may be on average at least 0.1 mm, at least 0.5 mm or at least 2 mm and on average at most 5 mm, at most 10 mm or at most 15 mm. The pattern can differ in color, in particular visible, from the material of the injected plastic melt 140. The pattern may be single or multi-colored. Individual pattern elements may be provided by individual plastic elements 150 or by a plurality of adjacent plastic elements 150. A combination of a speckle pattern and a marmoering pattern 1; 2 or different regions each having a speckle pattern or marmoering pattern 1; 2 can be provided on the vehicle cladding part 10; 10'; 10''.The injection of the plastic melt 140 may be performed through one (e.g., FIG. 3 ) or more injection channels, which may be arranged in the second mold half 120 (e.g., FIG. 3 ) and / or the first mold half 110. The injection of the plastic melt 140 can take place substantially along the direction of the gravitational acceleration or perpendicular thereto, depending on the arrangement of an injection device. During the provision and arrangement of the plastic particles 150 on the cavity surface, the cavity surface is generally arranged substantially horizontally, i.e. in a plane perpendicular to the direction of the gravitational acceleration. Thus, if plastic elements 150 are provided on the first mold half 110 and on the second mold half 120 and / or if the injection of the plastic melt 140 takes place in a direction perpendicular to the direction of the gravitational acceleration, the method can comprise the step of rotating the first mold half 110 and / or the second mold half 120 and / or the cavity 130 at least before the injection of the plastic melt 140. The injected plastic melt 140 can be cured by passive or active cooling of the first and second mold halves 110, 120, in particular on the two surfaces of the mold halves 111, 121 facing the vehicle trim part to be produced, depending on the material of the injected plastic melt 140.According to an optional method step, which is illustrated in FIG. 9, the plastic elements 150 arranged on the first cavity surface can be heated (indicated schematically by curved lines in FIG. 9 ) and pressed against the cavity surface by means of a pressing device 200 (see FIG. 9, wherein the pressing is indicated schematically by an arrow), in particular a hot pressing device, before the plastic melt 140 is injected into the cavity 130. In the example of FIG. 9, the respective plastic particle 150 is arranged on a surface 111 of the first mold half 110. Alternatively, the plastic elements 150 can also only be heated or pressed against the cavity surface. The heating of the plastic elements 150 can be effected by directly heating the plastic elements 150 and / or by heating the cavity surface and / or the cavity 130, for example by blowing hot air, thermal resistance heating, induction heating or heating by UV lamps. The heating, in particular the heating of the cavity surface, can take place before, during and / or after the provision and arrangement of the plastic elements 150 on the cavity surface. According to the example shown in FIG. 9, the pressing device 200 is provided with an anti-stick coating 210 on the side which faces the first mold half 110 during pressing. The coating 210 prevents the plastic elements 150 from adhering to the pressing device 200. The heating and / or pressing of the plastic elements 150 may result in a deformation of the plastic elements 150 such that their resulting depth of extension into the vehicle trim part 10; 10'; 10", measured along a surface normal of the vehicle trim part 10, 100%, is not more than 80%, not more than 50% or not more than 30%, thereby adapting the size of the plastic elements 150 to the aesthetic and structural requirements of the final product. The deformation can lead to the extension of the plastic elements 150 along the surface normal decreasing to up to 80%, 50% or 30% of their original size. Additionally or alternatively, by pressing the plastic elements 150, a homogeneous and in particular planar surface of the plastic elements 150 facing the pressing device 200 can be created. Additionally or alternatively, the heating and / or pressing of the plastic elements 150 can lead to an improved connection or adhesion of the plastic elements 150 to or on the cavity surface, in particular during the injection of the plastic melt 140 into the cavity 130 and / or during the curing of the injected plastic melt 140. This may allow better control of the desired pattern and may be particularly useful when the first mold half 110 and / or the second mold half 120 needs to be rotated from a substantially horizontal to a substantially vertical position prior to injection of the plastic melt 140. Additionally or alternatively, by heating and / or pressing the plastic elements 150, a deformation and / or at least partial overlapping and / or mixing of adjacent pattern elements can be achieved. This allows particular design effects to be achieved, for example when using multi-coloured patterns. Additionally or alternatively, a cohesive connection of adjacent plastic elements 150 can be produced by heating and / or pressing. For heating and / or pressing the plastic elements 150, the plastic elements 150 and / or the cavity surface and / or the pressing device 200 can be brought to a temperature of at least 60° C., at least 100° C., at least 140° C. or at least 150° C., in particular depending on the glass transition or melting temperature of the plastic elements.The plastic elements 150 can consist of or comprise a thermoplastic, in particular a recycled thermoplastic, for example to improve sustainability. The plastic elements 150 may consist of or comprise, for example, polypropylene or recycled polypropylene, which in particular leads to an improved sustainability and CO 2- reduction in order to minimize the global footprint. Alternatively or additionally, the plastic elements 150 can consist of or contain polylactide and / or recycled polylactide, but also of polyethylene terephthalate, acrylonitrile butadiene styrene, acrylonitrile styrene acrylate and / or their recycled counterparts. The totality of the plastic elements 150 and / or individual plastic elements 150 can be single-, two- or multi-colored in order to achieve the desired design, wherein pearlescent or glossy element surfaces can also be provided. The injected plastic melt 140 may consist of or comprise a thermoplastic or a recycled thermoplastic, e.g. for improving sustainability. The injected plastic melt 140 may comprise or consist of polypropylene, poly(methyl methacrylate), polycarbonate, polystyrene and / or acrylonitrile butadiene styrene. The injected plastic melt 140 can consist at least partially of a transparent or translucent material. In particular, the material of the plastic elements 150 and the material of the injected plastic melt 140 should be selected such that they are compatible with one another so that a cohesive connection is produced between the plastic elements 150 and the injected plastic melt during the injection and / or curing. The plastic elements 150 and / or the injected plastic melt 140 may consist of a monomaterial. In addition, additives, in particular binders, can be added to or contained in the plastic elements 150 and / or the injected plastic melt 140, so that a connection between individual plastic elements 150 and / or between the plastic elements 150 and the injected plastic melt 140 is improved. In addition, the additives may also improve adhesion between the plastic members 150 and the cavity surface.The plastic elements 150 may consist of or comprise solid plastic particles, plastic granules, plastic powders, plastic filaments and the like. The plastic elements 150 may comprise a preformed design pattern. Depending on the step of providing and arranging the plastic elements 150 on the cavity surface, a plastic raw material can be used which, in addition to molten plastic, also consists of or comprises solid plastic particles, plastic granules, plastic powder, plastic filaments and the like. The provision and arrangement of the plastic elements 150 on the cavity surface can be effected manually or mechanically, for example by means of a metering device, by spraying, sieving, filtering, brushing, punching and in particular by granulate extrusion or fused filament fabrication. Along the surface normal of the first cavity surface, which faces the vehicle trim part 10; 10'; 10" to be produced, the plastic elements 150 can be arranged essentially in a single layer or at least partially stacked one above the other. The plastic elements 150 and / or the plastic raw material can be substantially flat or extended in all three spatial directions. Depending on the method, the desired pattern, for example with regard to the distribution and arrangement of the individual pattern elements, can be predefined in some cases arbitrarily, but at least with regard to the mean extent and density of the plastic elements 150 visible on the visible side of the vehicle trim part 10; 10'; 10". Alternatively, the desired pattern can also be predefined with respect to the distribution and arrangement of the individual pattern elements.As described herein, the elements provided and arranged on the cavity surface are plastic elements 150 which consist at least partially of plastic. Additionally or alternatively, these elements may be made of or comprise other materials, e.g. metal and / or wood. For the plastic elements 150, material mixtures or composite materials of plastic and metal or wood can be used in particular. The respective elements can alternatively also be connected in a form-fitting manner to the injected plastic melt, in particular if they are porous elements.The provision and arrangement of the plastic elements 150 on the first mold half 110 can be effected by at least one die, in particular by granulate extrusion, e.g. using a hot runner, or by fused filament fabrication of plastic raw material. In granulate extrusion, the plastic raw material may consist of plastic granulate and in fused filament fabrication the plastic raw material may be a plastic filament. In the granulate extrusion using a hot runner, a conduit leading molten plastic raw material to the die and / or the die may have a heat insulating coating to maintain the desired temperature of the plastic melt of the raw material. The coating can be applied to conduit and / or nozzle surfaces which come into contact with the plastic melt of the raw material. When arranging the plastic elements 150 with at least one nozzle, the at least one nozzle can be moved along the cavity surface. Alternatively or additionally, however, the cavity surface can also be moved relative to the at least one nozzle. In order to obtain different shapes of the individual pattern elements, differently shaped nozzle cross sections can be used.A method performed by means of a nozzle for printing the desired patterns has the advantage that it is particularly precise. At the same time, however, it can be very time-consuming, in particular if different shaped and / or multi-coloured speckle elements of a speckle pattern 1 or line elements of a speckle pattern 2 are to be provided with only one nozzle or nozzle shape.According to an embodiment of the method in which the plastic elements 150 are provided and arranged by means of at least one nozzle, a plurality of plastic elements 150 can be provided and arranged simultaneously on the cavity surface by using a plurality of nozzles arranged side by side. This may be particularly suitable for producing a marmoering pattern 2. the nozzles may be arranged substantially in a plane, in particular in a plane parallel to the cavity surface. The nozzles may be arranged such that their major axes are substantially parallel. Depending on the pattern, the nozzles can be arranged substantially linearly or in a pack which is as compact as possible in all directions. Depending on the pattern, the nozzles can be moved individually or jointly along the side of the cavity surface and / or rotated about a nozzle main axis and / or fed with the plastic raw material and / or provided with different nozzle cross sections, whereby e.g. different line distances of individual adjacent lines, wavy lines, dashed lines and different line colors or different line shapes are produced.According to an alternative embodiment of the method, in which the plastic elements 150 are provided and arranged by means of at least one nozzle, a cartridge with differently shaped through holes can be provided and arranged between the nozzle and the cavity surface. The through holes may be selectively aligned with the nozzle along the nozzle main axis so that differently shaped plastic elements 150 corresponding to the through holes are provided and arranged on the cavity surface. This may be particularly suitable for producing a speckle pattern 1 with numerous differently shaped speckles of a predetermined shape, as illustrated for example in FIG. 15.Alternatively to providing and placing the plastic elements directly on the cavity surface through the at least one nozzle, a pattern of plastic elements 150 may be preformed through the at least one nozzle on any working surface and then transferred to the cavity surface.Two embodiments of an apparatus 300; 300' for simultaneously printing a plurality of lines on a flat or curved surface 311 to form a mark pattern 2 and an apparatus 400 for printing a plurality of different shapes on a flat or curved surface 411 to form a mark pattern 1 will be described below, respectively. These are particularly suitable for carrying out step 2 of the process described above by way of example. In particular, the devices 300; 300'; 400 can be used to provide and arrange plastic elements 150 directly on the cavity surface.In FIGS. 10, 12 and 13, two embodiments of an apparatus 300; 300' for simultaneously printing a plurality of lines on a flat or curved surface 311 for forming a mark pattern 2 from the perspective of the surface 311 to be printed are shown. The apparatus 300; 300' comprises a plurality of nozzles 310 configured to provide and arrange the plastic elements 150 on the surface 311. The nozzles 310 are arranged side by side. The nozzles 310 can be moved individually or jointly along the surface 311 and / or can be rotated about a main nozzle axis and / or can be fed with the plastic raw material and / or is provided with different nozzle cross sections. As shown in FIGS. 12 and 13, for example, dashed lines can be produced by the individual feeding of the nozzles 310, different line thicknesses can be produced by different nozzle cross sections, and wavy lines (marked by the corresponding black arrow) can be produced by the rotation of individual nozzles 310 (marked by a white arrow in FIG. 13 ). Also, the nozzles 310 may be individually movable along the surface 311. The dies 310 may be configured for compression by granulate extrusion, e.g. with a hot runner, or fused filament fabrication of plastic raw material. The nozzles 310 are mounted in a common movable print head 350 for feeding and controlling the nozzles 310. The arrangement of a plurality of nozzles 310 in a print head 350 enables a particularly compact arrangement of the nozzles 310, in which adjacent lines can be printed simultaneously and closer together. The print head 350 is movable in all six degrees of freedom. The nozzles 310 may be movably disposed in the print head 350 such that movement of the print head 350 results in global movement of all the nozzles 310 and movement of individual nozzles 310 results in movement thereof relative to each other. The nozzles 310 are arranged substantially in a plane parallel to the surface 311. The nozzles 310 are arranged such that their main nozzle axes are substantially parallel. The nozzles 310 may be arranged substantially linearly, as shown in FIG. 10, or in a pack as compact as possible in all directions, as shown in FIGS. 12 and 13. The shortest distance between two adjacent nozzles 310, in particular at right angles to the main nozzle axis, can be a maximum of 0 mm, 0.1 mm, 1 mm or 10 mm. In the present illustration, the nozzles 310 are arranged immediately adjacent to one another.An exemplary arrangement of plastic elements 150 forming a marmoering pattern printed on a surface 311 is illustrated in Fig. 11. This pattern can be achieved with the device 300 shown in FIG. 10 by, for example, simultaneously moving and rotating the print head 350 of the device 300 along the surface 311.In Fig. 14, along a plane of a nozzle main axis N, there is shown an embodiment of an apparatus 400 for printing a plurality of different shapes on a plane or curved surface 411 to form a speckle pattern 1. The apparatus 400 comprises a nozzle 410 configured to provide and arrange plastic elements 150 on the surface 411, in particular by granulate extrusion or fused filament fabrication of plastic raw material, and comprises a cartridge 450 having differently shaped through holes 460 arranged between the nozzle 410 and the surface 411. The pick-up and discharge of plastic raw material by the apparatus 400 are schematically illustrated by straight black arrows. Exemplary cartridges 450; 450' are shown in Figs. 16 and 17 in a plane along the nozzle main axis N. The through holes 460 are selectively alignable with the nozzle 410 along the nozzle main axis N. Since the device 400 comprises a cartridge 450; 450' arranged between the nozzle 410 and the surface 411, in which differently shaped through holes 460 can be aligned with the nozzle main axis N in order to print different shapes, predetermined and more complex speckle patterns 1 can be printed in a shorter time. The through-holes 460 are radially distributed about an axis of rotation R of the cartridge 450; 450', wherein the cartridge 450; 450' is rotatably mounted about the axis of rotation R for aligning the through-holes 460 with the nozzle main axis N. The rotation of the cartridges 450; 450' about the axis of rotation R is schematically illustrated by curved black arrows. The axis of rotation R of the cartridge 450; 450' and the main nozzle axis N run parallel to one another and spaced apart from one another. The shapes of the through holes 460 are defined by a cross section of the through holes 460 that is substantially perpendicular to the rotational axis R and substantially perpendicular to the nozzle main axis N. The various shapes of the through-holes 460 may be substantially circular and / or angular, as shown in FIGS. 17 and 16, respectively. The cross-section of at least one or all of the through-holes 460 at an end of the through-hole 460 facing the nozzle 410 may have a largest diameter that is substantially equal to and / or smaller than the largest diameter of the nozzle cross-section at an end of the nozzle facing the cartridge 450; 450', as shown in FIG. 14. The cross-section of at least one or all of the through-holes 460 may taper towards an end of the through-hole 460 facing away from the nozzle 410, as shown in FIG. 14. The cartridge 450; 450' is disposed immediately adjacent to the nozzle 410. The minimum distance between the cartridge 450; 450' and the nozzle 410 measured along the nozzle main axis N may be a maximum of 0 mm, 0.1 mm or 0.5 mm. The exemplary cartridges 450; 450' shown in FIGS. 14, 16 and 17 are designed as a substantially planar disk, wherein the axis of rotation R corresponds to the principal axis of inertia, which runs along the surface normal of the disk base surface. In Figures 16 and 17, possible nozzle areas in which nozzle 410 is alignable with through holes 460 are identified as shaded circle segments.An exemplary arrangement of plastic elements 150 for forming a speckle pattern printed on a surface 411 is illustrated in Figure 15. This pattern can be achieved with the device 400 shown in Figure 14 using the cartridge 450 shown in Figure 16.FIGS. 5 and 6 show two exemplary vehicle trim parts 10 in a vehicle interior with a speckle pattern 1; 2. the vehicle trim part 10 has a visible side visible from the outside and comprises plastic elements 150 which are arranged in an injection-molded plastic and are connected thereto in a materially integral manner such that a visible speckle pattern and / or marshalling pattern 1; 2 is formed on the visible side. In particular, both exemplary vehicle trim parts 10 can be vehicle trim parts 10 which can be produced or are produced by a method and / or with a device 300; 300'; 400 as described above. The exemplary vehicle trim parts 10 illustrated in FIGS. 5 and 6 are vehicle trim parts. These are in particular decorative parts of a door cladding and a front console. Alternatively, the vehicle trim part can also be an outer vehicle part, a part of a central console or a roof trim or the like. The vehicle trim part can be a trim part with a substantially planar or curved visible side.The plastic elements 150 may consist of or comprise a thermoplastic, in particular a recycled thermoplastic. The plastic elements 150 may consist of or comprise, for example, polypropylene or recycled polypropylene. Alternatively or additionally, the plastic elements 150 can consist of or comprise polylactide and / or recycled polylactide, but also polyethylene terephthalate, acrylonitrile butadiene styrene, acrylonitrile styrene acrylate and / or their recycled counterparts. The plastic elements 150 may be made of a mono-material. The totality of the plastic elements 150 and / or individual plastic elements 150 can be single-, two- or multi-coloured, wherein pearlescent or glossy element surfaces can also be provided. The injected plastic may consist of or comprise a thermoplastic or a recycled thermoplastic. The injection molded plastic may consist of or comprise polypropylene, poly(methyl methacrylate), polycarbonate, polystyrene and / or acrylonitrile butadiene styrene. The injected plastic can consist of a mono-material. The injection-molded plastic can consist at least partially of a transparent or translucent material.The depth of extension of the plastic elements 150 into the vehicle trim part, measured along a surface normal of the vehicle trim part, may be 100%, at most 80%, at most 50% or at most 30%. Additionally or alternatively, the extension depth may be not less than 1%, not less than 5%, not less than 10% or not less than 20%. An average extension depth of the plastic elements 150 may be 30%.

Claims

A method for manufacturing a vehicle trim part (10; 10'; 10") with a visible speckle and / or marmoering pattern (1; 2) on an externally visible visible side (11) of the vehicle trim part (10; 10'; 10"), the method comprising the steps of: providing an injection mold (100) having a first mold half (110) and a second mold half (120) movable relative to each other between an open and a closed position of the injection mold (100), wherein the injection mold (100), in the closed position, forms a cavity (130) between the first and the second mold half (110; 120); injecting a plastic melt (140) into the cavity (130); curing the injected plastic melt (140) to the vehicle trim part (10); removing the vehicle trim part (10; 10'; 10") by opening the injection mold (100); wherein plastic elements (150) are provided before the injection of the plastic melt (140) into the cavity (130) and are arranged on a cavity surface such that the plastic elements (150) connect in a materially bonded manner to the injected plastic melt (140) during the injection and / or curing and a speckle and / or marmoering pattern (1; 2) is formed on the visible side (11) of the vehicle cladding part (10; 10'; 10").Method according to claim 1, wherein the cavity surface on which the plastic elements (150) are arranged substantially comprises a surface of the first mold half (111) and / or of the second mold half (121) facing the vehicle trim part (10; 10'; 10") to be produced.The method of claim 1 or 2, wherein the plastic elements (150) and the injected plastic melt (140) are arranged substantially immediately adjacent to the cavity surface.Method according to one of the preceding claims, wherein the plastic elements (150) on the visible side (11) of the vehicle cladding part (10; 10'; 10") form a macroscopic speckle and / or marmoering pattern (1; 2), wherein in particular a minimum visible extent of individual geometric elements of the speckle and / or marmoering pattern (1; 2) is on average at least 0.1 mm, at least 0.5 mm or at least 2 mm and on average at most 5 mm, at most 10 mm or at most 15 mm.Method according to one of the preceding claims, wherein, before the injection of the plastic melt (140) into the cavity (130), the plastic elements (150) arranged on the cavity surface are heated and / or pressed against the cavity surface by means of a pressing device (200), wherein the plastic elements (150) are deformed such that their resulting depth of extension into the vehicle trim part (10; 10'; 10") measured along a surface normal of the vehicle trim part (10; 10'; 10") is 100%, at most 80%, at most 50% or at most 30%, and wherein optionally the plastic elements (150) and / or the cavity surface and / or the pressing device (200) are brought to a temperature of at least 60°C, at least 100°C, at least 140°C or at least 150°C.Method according to any one of the preceding claims, wherein the plastic elements (150) are provided and arranged on the cavity surface by at least one die (310; 410), in particular by means of granulate extrusion or fused filament fabrication of plastic raw material, wherein the die (310; 410) is moved along the cavity surface.Method according to claim 6, in particular for forming the marmoering pattern (2) on the visible side (11) of the vehicle cladding part (10; 10'; 10"), wherein a plurality of plastic elements (150) are provided and arranged simultaneously on the cavity surface by a plurality of nozzles (310) arranged adjacent to one another, wherein the nozzles (310) are moved individually or jointly along the cavity surface and / or rotated about a nozzle main axis and / or fed with the plastic raw material and / or provided with different nozzle cross sections depending on the pattern.Method according to claim 6, in particular for forming the speckle pattern (1) on the visible side (11) of the vehicle cladding part (10; 10'; 10"), wherein a cartridge (450; 450') with differently shaped through holes (460) is provided and arranged between the nozzle (410) and the cavity surface, and wherein the through holes (460) are selectively brought into alignment with the nozzle (410) along a nozzle main axis (N) such that differently shaped plastic elements (150) corresponding to the through holes (460) are provided and arranged on the cavity surface.Vehicle trim part (10; 10'; 10") with a visible speckle and / or marmoering pattern (1; 2), wherein the vehicle trim part (10; 10'; 10") has a visible side (11) visible from the outside and comprises plastic elements (150) which are arranged in an injection-molded plastic and are connected thereto in a materially integral manner such that a visible speckle and / or marmoering pattern (1; 2) is formed on the visible side (11), wherein optionally the vehicle trim part (10; 10'; 10") has been produced by a method according to one of the preceding claims.Vehicle trim part (10; 10'; 10") according to claim 9, wherein the plastic elements (150) consist of or comprise a thermoplastic polymer, in particular polypropylene and / or recycled polypropylene and / or polylactide and / or recycled polylactide and / or wherein the injection molded plastic consists of or comprises polypropylene, poly(methyl methacrylate), polycarbonate, polystyrene and / or acrylonitrile butadiene styrene.The vehicle trim part (10; 10'; 10") according to claim 9 or 10, wherein a depth of extension of the plastic elements (150) into the vehicle trim part (10; 10'; 10") measured along a surface normal of the vehicle trim part is 100%, not more than 80%, not more than 50% or not more than 30%.Device (300; 300') for simultaneously printing a plurality of lines on a planar or curved surface (311) in order to form a mark pattern (2), wherein the device comprises a plurality of nozzles (310) which are configured for providing and arranging plastic elements (150) on the surface (311), in particular by means of granulate extrusion or fused filament fabrication of plastic raw material, wherein the nozzles (310) are arranged adjacent to one another and are individually or jointly movable along the surface (311) and / or rotatable about a main nozzle axis and / or speisatable with the plastic raw material and / or provided with different nozzle cross sections.The apparatus (300; 300') of claim 12, wherein the nozzles (310) are disposed in a common movable print head (350) for feeding and controlling the nozzles (310), and optionally wherein a shortest distance between two adjacent nozzles (310) is not greater than 0 mm, 0.1 mm, 1 mm or 10 mm.Apparatus (400) for printing a plurality of different shapes on a planar or curved surface (411) in order to form a speckle pattern (1), wherein the apparatus (400) comprises a nozzle (410) which is configured for providing and arranging plastic elements (150) on the surface (411), in particular by means of granulate extrusion or fused filament fabrication of plastic raw material, wherein the apparatus (400) comprises a cartridge (450; 450') having differently shaped through-holes (460) which are arranged between the nozzle (410) and the surface (411), and wherein the through-holes (460) can be selectively aligned with the nozzle (410) along a nozzle main axis (N).The apparatus (400) of claim 14, wherein the through-holes (460) are radially distributed about an axis of rotation (R) of the cartridge (450; 450'), and wherein the cartridge (450; 450') is rotatably mounted about the axis of rotation (R) for aligning the through-holes (460) with the nozzle major axis (N), optionally wherein the axis of rotation (R) of the cartridge (450; 450') and the nozzle major axis (N) are parallel and spaced apart from each other.

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