Method for manufacturing a patterned trim element comprising two materials, and associated trim element

Abstract

Method for manufacturing a trim element with a design, comprising two materials, and associated trim element. The present invention relates to a method for manufacturing a vehicle trim element, the trim element having a visible face, the manufacturing method comprising the following steps: - arranging at least one decorative element (122) on a molding surface of a mold provided according to a design, - introducing plastic material (126) into the mold, such that the plastic material (126) extends against the molding surface and the at least one decorative element (122). One of the at least one decorative element (122) and the plastic material (126) is made of at least a first material and a second material, the other comprising at least the first material. The invention also relates to a trim element thus obtained. Figure for the abstract: Fig 3

Description

Title of the invention: Method for manufacturing a patterned trim element comprising two materials, and associated trim element

[0001] The present invention relates to a method of manufacturing a visible surface trim element with at least one pattern, and an associated trim element.

[0002] We know of the making of a trim element with a background of one colour and a pattern of another colour.

[0003] However, it is not known to produce a trim element with a background and a pattern, one of the background or the pattern not being uniform.

[0004] The aim of the invention is then to propose a manufacturing process for a trim element presenting a new visual effect.

[0005] To this end, the invention relates to a method for manufacturing a vehicle trim element, the trim element having a visible face, the manufacturing method comprising the following steps:

[0006] - supply of a mold comprising a molding surface,

[0007] - arrangement of at least one decorative element on the molding surface according to a pattern,

[0008] - introduction into the plastic material mold, so that the plastic material extends against the molding surface and at least one decorative element,

[0009] in which at least one decorative element is made with at least one first material and a second material, the plastic material comprising at least the first material, or, in which the plastic material comprises at least one first material and a second material, at least one decorative element being made with a material comprising at least the first material.

[0010] One of the at least one decorative element and the plastic material comprises the first material and the second material, the other of the at least one decorative element and the material comprises at least the first material, such that the first has a non-uniform visual appearance compared to the second. The presence of the first material in the at least one decorative element and the plastic material further ensures good bonding of the at least one decorative element and the plastic material and a continuous visual appearance of the trim element.

[0011] According to other advantageous aspects of the invention, the method comprises one or more of the following features, taken individually or in all technically possible combinations:

[0012] - the first material has a melting point strictly lower than the melting temperature of the second material, at least one decorative element being distributed at a distribution temperature between the melting temperature of the first material and the melting temperature of the second material and / or the plastic material being introduced at an introduction temperature between the melting temperature of the first material and the melting temperature of the second material;

[0013] - the second material forms inclusions in the first material in the minus one decorative element and / or in plastic material;

[0014] - at least one decorative element is made up of the first material and the second material, the plastic material being made up of the first material, or in which the plastic material is made up of the first material and the second material, at least one decorative element being made up of the first material;

[0015] - at least one decorative element is made of a material consisting of first material and second material, the first material having a melting temperature strictly lower than the melting temperature of the second material, the distribution of at least one decorative element being carried out by additive manufacturing by at least one nozzle, the first material and the second material being mixed in the nozzle upstream of the distribution at a temperature between the melting temperature of the first material and the melting temperature of the second material;

[0016] - at least one decorative element and the plastic material are each made up of of the first material and the second material, the ratio of the quantity of the first material to the quantity of the second material being different between the plastic material and at least one decorative element;

[0017] - the distribution of at least one decorative element is carried out by manufacturing additive or by extrusion of molten granules;

[0018] - at least one decorative element has a thickness between 0.2 mm and 1.5 mm; and / or

[0019] - the first material is, for example, polypropylene, polylactic acid (PLA), polymethyl methacrylate (PMMA), polyamide (PA), polycarbonate (PC); a mixture of polycarbonate and acrylonitrile butadiene styrene (PC ABS), a mixture of polypropylene and glass fibers (PP GF), or a mixture of polypropylene and natural fibers (NF PP), and the second material is, for example, polypropylene, polylactic acid (PLA), polymethyl methacrylate (PMMA), polyamide (PA), polycarbonate (PC); a mixture of polycarbonate and acrylonitrile butadiene styrene (PC ABS), a mixture of polypropylene and glass fibers (PP GF), or a mixture of polypropylene and natural fibers (NF PP).

[0020] The invention also relates to a filling element obtained by a manufacturing process as defined above.

[0021] The invention will become clearer upon reading the following description, given solely by way of non-limiting example, and made with reference to the drawings in which:

[0022] [Fig. 1] [Fig. 1] is a schematic representation of an example of a distribution step of at least one decorative element in a first embodiment of the process according to the invention,

[0023] [Fig.2] [Fig.2] is a schematic representation of an example of a step for introducing the plastic material in the first embodiment of the process according to the invention,

[0024] [Fig.3] [Fig.3] is a schematic representation of an example of a packing assembly obtained by the first embodiment of the process according to the invention,

[0025] [Fig.4] [Fig.4] is a schematic representation of an example of a packing assembly obtained by a second embodiment of the process according to the invention, and

[0026] [Fig.5] [Fig.5] is a schematic representation of an example of a packing assembly obtained by a third embodiment of the process according to the invention.

[0027] Steps of an example embodiment of the process according to the invention are shown in Figures 1 to 4.

[0028] The invention also relates to a filling element obtained by the manufacturing process according to the invention.

[0029] The process according to the invention is a process for manufacturing a vehicle trim element, the trim element having a visible face.

[0030] The process comprises the following steps:

[0031] - provide a mold 10 comprising a molding surface 16,

[0032] - arrange, here distribute, at least one decorative element 22 on the surface of molding 16 according to a pattern,

[0033] - introduce into the mold 10 of the plastic material 26.

[0034] The process further comprises the following steps:

[0035] - hardening of the plastic material, and

[0036] - removal of the assembly comprising the plastic material and at least one element of decorating the mold after the plastic material has hardened

[0037] An example of a mold 10 that can be used for the manufacturing process according to the invention is shown schematically in Figures 1 (partially) and 2.

[0038] The mold 10 has a molding surface 16.

[0039] In at least one mold configuration, the molding surface 16 delimits a molding cavity 20.

[0040] The mold 10 further includes a material inlet 18.

[0041] The material inlet 18 opens into the molding cavity 20.

[0042] The mold 10 comprises, for example, here, a plurality of mold parts 12, 14, here a first mold part 12 and a second mold part 14.

[0043] Each mold part 12, 14 comprises a portion of the molding surface 16.

[0044] The mold parts 12, 14 are movable relative to each other between an open configuration and a molding configuration.

[0045] In the open configuration, the mold parts 12, 14 are spaced apart from each other. The molding surface 16 is accessible.

[0046] In the molding configuration, the mold parts 12, 14 delimit the molding cavity 20. The mold parts 12, 14 extend against each other, so as to delimit said molding cavity.

[0047] The mold 10 is, for example, an injection mold, for example for injection overmolding.

[0048] Alternatively, the mold 10 is a rotomolding mold or an injection and blow molding mold.

[0049] At least one decorative element 22 is arranged, here distributed, on the molding surface 16 of the mold 10, more particularly here on the portion of the molding surface 16 delimited by the first part of the mold 12, more particularly only on a part of the portion of the molding surface 16 delimited by the first part of the mold 12.

[0050] A schematic representation of an example of this step, in a first embodiment of the invention, is shown in [Fig.1].

[0051] The distribution of at least one decorative element 22 is carried out by additive manufacturing, more particularly by fused filament deposition (or FDM from the English Fused deposition modeling), or by extrusion of fused granules.

[0052] More particularly, at least one decorative element 22 is distributed by at least one nozzle 24 onto the molding surface 16, more particularly only onto a part of the portion of the molding surface defined by one of the mold parts, here the first mold part 12.

[0053] At least one nozzle 24 is able to move in relation to the molding surface 16, here in relation to the portion of the molding surface delimited by the first part of the mold 12, so as to deposit material, more particularly according to a desired decoration pattern.

[0054] The material is, for example, heated upstream of the nozzle 24, so as to flow through the nozzle 24 onto the molding surface 16.

[0055] The distribution of at least one decorative element 22 is here carried out in an open configuration of the mold.

[0056] At least one decorative element 22 has a thickness, measured perpendicular to the molding surface 16.

[0057] The thickness is, for example, between 0.2 mm and 1.5 mm.

[0058] A thickness of the order of 0.2 mm allows to have a relative transparency of at least one decorative element, so that, in the trim element, the plastic material is visible through at least one decorative element.

[0059] A thickness greater than 0.5 mm prevents the plastic material from being seen through at least one decorative element.

[0060] Between the arrangement of at least one decorative element 22 and the introduction of the plastic material, the at least one decorative element 22 is, for example, optionally, kept at temperature.

[0061] The mold is then, for example, subsequently moved into the molding configuration.

[0062] The plastic material 26 is then introduced into the mold 10, more particularly into the molding cavity 20, here through the material inlet 18.

[0063] An example of the plastic material 26 introduction step, for the first embodiment of the invention, is shown in [Fig.2].

[0064] The material inlet 18 opens at the level of the molding surface 16, here delimited by a different part of the mold than that on which at least one decorative element 22 has been distributed. Here, the material inlet 18 opens at the level of the portion of the molding surface 16 defined by the second part of the mold.

[0065] The introduction of the plastic material is, for example, carried out in a closed configuration of the mold.

[0066] The plastic material is introduced, so that the plastic material spreads against the molding surface and at least one decorative element 22.

[0067] During introduction, at least one decorative element remains in position on the molding surface 16. More particularly here, at least one decorative element 22 is pressed onto the molding surface by the introduced plastic material.

[0068] The plastic material here is a thermoplastic material.

[0069] More particularly, the plastic material is in fluid form, here molten, and is introduced so as to cover at least one texture element, and here also to fill the molding cavity.

[0070] The introduction of plastic material into the mold here involves injecting the plastic material, in this case molten, into the mold cavity delimited by the mold surface. This introduction corresponds, for example, to injection overmolding. The material introduced by injection overmolding has, for example, a temperature between 160°C and 300°C.

[0071] In an alternative embodiment to injection molding as described above, the introduction of plastic material into the mold includes a step of introducing plastic material into the mold cavity through a material inlet, the mold being a rotomolding mold. The introduction of plastic material into the mold then further includes setting the mold in motion, more particularly rotating the mold, to distribute the introduced plastic material over the molding surface and cover at least one decorative element 22. More particularly, the plastic material is introduced in powder form. Thus, before rotating the mold, the plastic powder is heated to obtain a fluid plastic material that is evenly distributed over the molding surface.

[0072] In an alternative embodiment to injection as described above and to rotomolding, the introduction into the mold of plastic material includes a step of introducing a preform into an injection-blowing mold, the preform being made in the plastic material.

[0073] The material inlet of the injection-blowing mold is designed for the injection of a gas, for example air.

[0074] The preform is arranged so that the neck of the preform is maintained at the level of the material inlet, so that the material inlet is able to inject the gas into the preform, so as to blow the preform.

[0075] More specifically, the preform is heated after its introduction so as to be deformable by blowing. The preform is then, for example, heated to a temperature between 170°C and 230°C.

[0076] The introduction of plastic material into the mold then further includes the introduction of gas into the preform, so as to blow the preform.

[0077] The preform is then blown until the walls of the preform extend against the molding surface and cover at least one decorative element 22.

[0078] The hardening includes, for example, cooling the assembly formed of the plastic material 26 and at least one decorative element 22, more particularly down to 50°C.

[0079] The mold no longer heats up during the hardening stage.

[0080] The plastic material 26 and the at least one decorative element 22 bond together during the introduction of the plastic material and / or during hardening.

[0081] The assembly formed of the hardened plastic material 26 and at least one decorative element 22 is then, for example, removed from the mold 10, more particularly from the molding cavity 20, after the hardening of the plastic material.

[0082] More particularly, the mold 10 is moved into the open position, the assembly formed of the hardened plastic material 26 and at least one decorative element 22 being extracted from the mold 10 during or after this movement.

[0083] The plastic material is no longer malleable, so that the assembly maintains its shape.

[0084] The hardened plastic material 26 with at least one decorative element 22 then forms the trim element, or at least a part of the trim element.

[0085] At least one decorative element 22 forms part of the external surface of the assembly formed from the hardened plastic material 26 and at least one decorative element 22, so that the pattern made with at least one decorative element 22 is visible on a visible face of the trim element.

[0086] In the invention, at least one decorative element 22 is made with at least one first material A and a second material B, the plastic material 26 comprising at least the first material A, or, the plastic material 26 comprises at least one first material and a second material, at least one decorative element 22 being made with a material comprising at least the first material.

[0087] At least one decorative element is arranged here, during the arrangement step, at a distribution temperature higher than the melting temperature of the first material, and the plastic material is introduced, during the plastic material introduction step, at an introduction temperature higher than the melting temperature of the first material.

[0088] Here, the first material has a melting point strictly lower than the melting point of the second material. The difference between the melting points is, for example, between 20°C and 200°C.

[0089] The first material is a thermoplastic material, for example, polypropylene, polylactic acid PLA, polymethyl methacrylate PMMA, polyamide PA, polycarbonate PC; a mixture of polycarbonate and Acrylonitrile-Butadiene-Styrene PC ABS, a mixture of polypropylene and glass fibers PP GF, or a mixture of polypropylene and natural fibers NF PP.

[0090] The second material is, for example, polypropylene, polylactic acid PLA, polymethyl methacrylate PMMA, polyamide PA, polycarbonate PC, a mixture of polycarbonate and Acrylonitrile-Butadiene-Styrene PC ABS, a mixture of polypropylene and glass fibers PP GF, or a mixture of polypropylene and natural fibers NF PP.

[0091] The first material has, for example, a given color, identical between at least one decorative element 22 and the plastic material 26.

[0092] The second material is present in the form of bodies having a dimension between 0.05 mm and 1 mm.

[0093] More specifically, here, at least one decorative element is arranged at a distribution temperature between the melting temperature of the first material and the melting temperature of the second material and / or the plastic material is introduced at an introduction temperature between the melting temperature of the first material and the melting temperature of the second material.

[0094] More particularly, each of the at least one decorative element and / or plastic material comprising the first material and the second material is distributed or introduced at a temperature between the melting temperature of the first material and the melting temperature of the second material.

[0095] In the case of at least one decoration element 22, the distribution of at least one decoration element is carried out by additive manufacturing by at least one nozzle 24, the first material and the second material being mixed in the nozzle upstream of the distribution at the distribution temperature.

[0096] The second material then forms inclusions, for example like speckling, in the first material in at least one decorative element and / or in the plastic material.

[0097] Indeed, the second material is only slightly or not at all molten, while the first material is molten. The first material therefore forms a fluid matrix for the second material, so that the second material forms inclusions in the first material.

[0098] The presence of the first material as a matrix for each of the at least one decorative element 22 and the plastic material 26 allows for good bonding of the at least one decorative element 22 and the plastic material 26 to each other.

[0099] The density of inclusions, particularly speckling, is, for example, substantially constant within the at least one decorative element and / or the plastic material. In particular, the ratio of the quantity of first material to the quantity of second material supplied for the distribution step of the at least one decorative element 22 and / or for the introduction step of the plastic material 26 is substantially constant during said step.

[0100] Alternatively, said density is variable within the at least one decorative element and / or the plastic material. The ratio of the quantity of first material to the quantity of second material supplied for the distribution step of the at least one decorative element 22 and / or for the introduction step of the plastic material 26 then varies during said step.

[0101] In a first embodiment, an example of which of the resulting trim element 110 is shown in [Fig.3], at least one decorative element 122 is made with at least the first material A and the second material B, the plastic material 126 comprising at least the first material A.

[0102] More specifically, at least one decorative element 122 is made up of the first material A and the second material B.

[0103] During the distribution step, at least one decoration element 122 is distributed, as described previously, at the distribution temperature, which is between the melting temperature of the first material and the melting temperature of the second material.

[0104] More particularly, the first material and the second material are mixed in the nozzle upstream of the dispensing at the dispensing temperature.

[0105] The second material forms inclusions, like speckling, in the first material in at least one decorative element 122.

[0106] In the first embodiment, the plastic material 126 is here made up of the first material.

[0107] During the introduction step, the plastic material 126 is introduced at the introduction temperature higher than the melting temperature of the first material.

[0108] The plastic material 126 therefore has a uniform appearance of the first material A.

[0109] The first material has, for example, a given color, identical between The at least one decorative element 122 and the plastic material 126 are combined such that the at least one decorative element 122 forms an area (delimited by dotted lines in the schematic representation) in which the first material has inclusions like speckling, while the plastic material 126 has a similar appearance without said inclusions. This makes it possible, for example, to create one or more decorations with inclusions like speckling, but which have the same background across the entire final trim element.

[0110] In a second embodiment, an example of which of the resulting trim element 210 is shown in [Fig.4], at least one decorative element 222 is made with at least the first material and the second material, and the plastic material comprises at least the first material and the second material.

[0111] The at least one decorative element 222 is, for example, here similar to the at least one decorative element 122 of the first embodiment.

[0112] In particular, it is distributed similarly, at a distribution temperature between the melting temperature of the first material and the melting temperature of the second material.

[0113] The second material forms inclusions in the first material in at least one decorative element 222.

[0114] In the second embodiment, unlike the first embodiment, the plastic material further comprises the second material.

[0115] The plastic material 226 is, for example, made up of the first material and the second material.

[0116] During the plastic material introduction step, the plastic material 226 is introduced, as described above, at the introduction temperature, including between the melting point of the first material and the melting point of the second material.

[0117] The second material forms inclusions, for example like speckling, in the first material in the plastic material.

[0118] In the second embodiment, the ratio of the quantity of the first material to the quantity of the second material is, for example, different between the plastic material and at least one decorative element.

[0119] For example, the ratio of the quantity of the first material to the quantity of the second material is substantially constant within the or each decorative element 222, on the one hand, and within the plastic material 226 on the other hand, said ratio being different between the at least one decorative element 222 and the plastic material 226.

[0120] Additionally or alternatively, the distribution temperature of at least one decorative element 222 differs from the introduction temperature of the plastic material 226.

[0121] This allows, for example, to obtain inclusions of a second material having a different appearance between the at least one decorative element 222 and the plastic material 226.

[0122] The first material has, for example, similarly to before, a given color, identical between the at least one decorative element 222 and the plastic material 226, so that the resulting filling element has a similar background, but with the at least one decorative element 222 and the plastic material 226 each forming an area (delimited by dotted lines on the schematic representation), in which the first material has inclusions such as speckling.

[0123] In a third embodiment, an example of which of the resulting trim element 310 is shown in [Fig.5], the plastic material 326 comprises at least a first material and a second material, the at least one decorative element 322 being made with a material comprising at least the first material.

[0124] More specifically, the plastic material 326 consists of the first material and the second material.

[0125] During the introduction step, the plastic material 326 is introduced, as described previously, at the introduction temperature, which is between the melting temperature of the first material and the melting temperature of the second material.

[0126] More specifically, the first material and the second material are mixed upstream of the material inlet 18 at the inlet temperature.

[0127] The second material forms inclusions, like speckling, in the first material in the plastic material 326.

[0128] In the third embodiment, at least one decorative element is made of the first material.

[0129] During the distribution step, at least one decoration element 322 is distributed at the distribution temperature, which is higher than the melting temperature of the first material.

[0130] At least one decorative element 322 therefore has a uniform appearance of the first material A.

[0131] The first material has, for example, a given color, identical between the at least one decorative element 322 and the plastic material 326, such that the at least one decorative element 322 forms an area (delimited by dotted lines in the schematic representation) in which the first material has no inclusions, while the at least one decorative element 322 has a similar appearance with inclusions. This makes it possible, for example, to create one or more decorations without inclusions on a trim element that otherwise has inclusions, but which has the same background throughout the entire final trim element.

[0132] In a particular embodiment, not shown, the molding surface is partially delimited by a removable shell.

[0133] More particularly, the mold includes at least one removable shell capable of being reversibly fixed to a part of the mold, so that the removable shell forms part of the molding surface.

[0134] At least one decorative element is distributed on the part of the molding surface formed by the removable shell.

[0135] Said distribution is, for example, carried out when the removable shell is separated from the mold part.

[0136] Then, the removable shell is fixed to the mold part before the introduction of the plastic material, more particularly so that the removable shell partially delimits the molding cavity during the introduction.

[0137] In a particular embodiment, the mold comprises several copies of at least one removable shell.

[0138] The process then includes, for example, simultaneously a step of making a first filling element in the mold equipped with a first copy of at least one removable shell, for example the introduction of plastic material into the mold, and the distribution of at least one decoration element on a second copy of at least one removable shell for making a second filling element.

[0139] This allows in particular the distribution of at least one decorative element to be carried out in masked time.

[0140] As soon as the first filling element is extracted from the mold equipped with the first copy of at least one removable shell, the second copy of at least one removable shell is fixed to the mold part, so as to equip the mold with this second copy of at least one removable shell.

[0141] This makes it possible to produce trim elements using the process according to the invention more quickly.

[0142] In a particular embodiment, not shown, the method further includes a step of distributing a wall along at least a portion of at least one lateral surface of at least one decorative element 22, after the distribution of at least one decorative element 22 and before the introduction into the mold of the plastic material.

[0143] The lateral surface corresponds to one side of at least one decorative element arranged on the molding surface 16.

[0144] The wall is made of the same material as the introduced plastic material.

[0145] The wall is, for example, produced by additive manufacturing, more particularly by fused wire deposition (or FDM from the English Fused deposition modeling), or by extrusion of molten granules.

[0146] The presence of a wall against a lateral surface of the decorative element limits, or even avoids, the phenomenon of displacement of the material of the decorative element when introduced into the plastic mold, so that the contours of the pattern are particularly sharp.

Claims

Demands

1. A method for manufacturing a vehicle trim element, the trim element having a visible face, the manufacturing method comprising the following steps: - providing a mold (10) comprising a molding surface (16), - arranging at least one decorative element (22; 122; 222; 322) on the molding surface (16) according to a pattern, - introducing plastic material (26; 126; 226; 326) into the mold (10), such that the plastic material (26; 126; 226; 326) extends against the molding surface (16) and the at least one decorative element (22; 122; 222; 322), wherein the at least one decorative element (22; 122; 222) is made of at least one first material and a second material, the plastic material (26; 126; 226) comprising at least the first material, or, in which the plastic material (226; 326) comprises at least a first material and a second material, at least one decorative element (222;322) being made with a material comprising at least the first material.;

2. A manufacturing method according to claim 1, wherein the first material has a melting temperature strictly lower than the melting temperature of the second material, at least one decorative element (22; 122; 222) being distributed at a distribution temperature between the melting temperature of the first material and the melting temperature of the second material and / or the plastic material (226; 326) being introduced at an introduction temperature between the melting temperature of the first material and the melting temperature of the second material.

3. A manufacturing method according to claim 1 or 2, wherein the second material forms inclusions in the first material in at least one decorative element (22; 122; 222) and / or in the plastic material (226; 326).

4. A manufacturing method according to any one of claims 1 to 3, wherein at least one decorative element is made of the first material and the second material (22; 122), the plastic material (26; 126) being made of the first material, or in in which the plastic material (326) is made up of the first material and the second material, at least one decorative element (322) being made up of the first material.

5. A manufacturing method according to any one of claims 1 to 4, wherein at least one decorative element (22; 122; 222) is made of a material consisting of the first material and the second material, the first material having a melting temperature strictly lower than the melting temperature of the second material, the distribution of at least one decorative element (22; 122; 222) being carried out by additive manufacturing by at least one nozzle (24), the first material and the second material being mixed in the nozzle (24) upstream of the distribution at a temperature between the melting temperature of the first material and the melting temperature of the second material.

6. A manufacturing method according to any one of claims 1 to 5, wherein the at least one decorative element (222) and the plastic material (226) are each made up of the first material and the second material, the ratio of the quantity of the first material to the quantity of the second material being different between the plastic material (226) and the at least one decorative element (222).

7. A manufacturing method according to any one of claims 1 to 6, wherein the distribution of at least one decorative element (22; 122; 222; 322) is carried out by additive manufacturing or by extrusion of molten granules.

8. A manufacturing method according to any one of claims 1 to 7, wherein at least one decorative element (22; 122; 222; 322) has a thickness between 0.2 mm and 1.5 mm.

9. A manufacturing method according to any one of claims 1 to 8, wherein the first material is, for example, polypropylene, polylactic acid (PLA), polymethyl methacrylate (PMMA), polyamide (PA), polycarbonate (PC); a mixture of polycarbonate and acrylonitrile butadiene styrene (PC ABS), a mixture of polypropylene and glass fibers (PP GF), or a mixture of polypropylene and natural fibers (NF PP), and the second material is, for example, polypropylene, polylactic acid (PLA), polymethyl methacrylate (PMMA), polyamide (PA), polycarbonate (PC); a mixture of polycarbonate and acrylonitrile butadiene styrene (PC ABS), 15 a mixture of polypropylene and glass fibers (PP GF), or a mixture of polypropylene and natural fibers (NF PP).

10. Filling element (110; 210; 310) obtained by a manufacturing process according to any one of claims 1 to 9.

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