Process for densifying flexible materials

Abstract

Method for densifying flexible materials The invention relates to a method for densifying a material (37) originating from a seat support element or intended for such a support element, comprising the following steps: - providing a first volume (40) of material in a densification device (10) comprising a grid (22) comprising through orifices (25), and a pressure roller (30), - rotating the pressure roller (30) and compressing the material between the pressure roller (30) and the grid (22), and - extruding a second volume (45) of material through the orifices (25) of the grid (22), the second volume (45) being strictly less than the first volume and the density of the material in the second volume being strictly greater than the density of the material in the first volume (40). Figure for abstract: Figure 1

Description

Title of the invention: Method for densifying flexible materials

[0001] The present invention relates to a method for densifying a material originating from a seat support element or intended for such a support element.

[0002] The materials used to produce seat support elements form in particular the padding(s) and / or the cover of the seat and the seat back. They are used to give the seat support a flexible and comfortable appearance.

[0003] The materials used to produce seat support elements are foamed materials, which are not very dense and / or contain a relatively large quantity of air and / or are textiles such as fabrics, leathers, skins.

[0004] The storage of these materials therefore requires a relatively large amount of space, due to their low density, which represents both logistical and economic constraints.

[0005] Furthermore, due to their elastic return, it proves difficult to compress these materials with conventional densification processes. Indeed, as mentioned above, once compressed, these materials tend to return to their undeformed state, and therefore cancel out the effects of compaction.

[0006] Furthermore, this type of material is sometimes difficult to recycle. Indeed, the presence of air trapped in the material disrupts the chemical reactions implemented during recycling, and also promotes the oxidation of the material.

[0007] One of the aims of the invention is then to propose a densification method making it possible to facilitate the storage and recycling of a material originating from a seat support element or intended for such a support element.

[0008] To this end, the invention relates to a method for densifying a material originating from a seat support element or intended for such a support element, comprising the following steps: - supplying at least a first volume of a material originating from a vehicle seat support element or intended for such a support element in a densification device comprising an enclosure provided with a grid comprising through-orifices in a thickness direction, and at least one compressor roller movable in rotation about a central axis of the grid and movable in rotation about an axis of rotation of the compressor roller, the grid separating the enclosure between an upper chamber and a lower chamber in the thickness direction, said compressor roller and said first volume being arranged in the upper chamber of the enclosure, - rotation of the steamroller around the axis of rotation and / or around the central axis, - compression of at least one first volume by the steamroller between the steamroller and the grid, - extrusion into the lower chamber of the enclosure of at least a second volume of material through the orifices of the grid, the second volume being strictly less than the first volume and the density of the material in the second volume being strictly greater than the density of the material in the first volume.

[0009] The compression of the at least one first volume and the extrusion into the lower chamber of the enclosure of a second volume of material through the orifices of the grid make it possible to obtain a second volume of material strictly less than the first volume and having a density strictly greater than that of the first volume.

[0010] The process then provides effective compaction and densification of the first volume of material.

[0011] The second volume of material having a reduced volume can be stored in a limited storage space, which reduces the costs associated with the transport and storage of said material.

[0012] Furthermore, the second volume of material having a higher density, it is easily handled, for example in order to feed a machine capable of carrying out chemical reactions allowing the recycling of the material. The second volume also has a reduced quantity of air due to the compression, which improves the efficiency of the recycling and limits the oxidation of the materials.

[0013] According to other advantageous aspects of the invention, the method comprises one or more of the following characteristics, taken in isolation or in all technically possible combinations:

[0014] - the material is composed of at least one padding part and at least one cover portion of a seat support element, the method comprising a step of separating the padding portion and the cover portion, the separation step preferably being carried out upstream of the step of providing the first volume;

[0015] - the method comprises a preliminary step of grinding a support element of vehicle seat, the first volume of material being derived from said grinding;

[0016] - the material is a foam, and / or is a natural or synthetic textile and / or is a natural or synthetic skin;

[0017] - the through holes of the grid have a maximum dimension, in a plane perpendicular to the thickness direction, between 2 mm and 10 mm, the second extruded volume having a maximum dimension, in a plane perpendicular to the thickness direction, between 2 mm and 10 mm;

[0018] - the grid is movable in translation along the central axis, the compression step of the au less a first volume by the steamroller between the steamroller and the grid being implemented by moving the grid along the central axis so as to bring the grid closer to the or each steamroller;

[0019] - the step of compressing the first volume is carried out until a pressure value in the first volume between 20 bars and 180 bars;

[0020] - the method comprises a step of decontaminating the first volume of material, before the step of providing at least a first volume, the decontamination step being configured to reduce the quantity of non-compressible impurities present in said material;

[0021] - the method comprises a step of adding a binder to the at least one first volume of material before the step of compressing the at least one first volume, the binder being configured to improve the agglomeration of the material of the first volume during compression;

[0022] - the material is composed of at least one part of padding and / or at least one cover portion of a seat support element, the method comprising a preliminary step of dismantling a vehicle seat arranged on a vehicle floor, the preliminary step consisting of removing a portion of the padding and / or the cover from the seat frame in order to recover the material while leaving the seat frame in whole or in part in place on the vehicle floor.

[0023] The invention also relates to a cover or padding of a seat support element made from the second volume obtained at the end of the densification process as described above, the padding being preferably made with the second volume from the padding part of the material after separation of the padding part and the cover part.

[0024] The invention will appear more clearly on reading the description which follows, given solely by way of non-limiting example, and made with reference to the drawings in which:

[0025] [Fig-1] [Fig.l] is a schematic representation of a device implementing a densification method according to the invention,

[0026] [Fig.2] [Fig.2] is a schematic representation of a vehicle seat arranged on a floor of the vehicle, and

[0027] [Fig.3] [Fig.3] is a schematic representation of the seat of [Fig.2], from which the cover and padding have been removed.

[0028] [Fig.l] illustrates a device 10 implementing a densification method according to the invention.

[0029] The densification device 10 comprises an enclosure 15 formed of an upper chamber 16 and a lower chamber 17 separated along a thickness direction E. The thickness direction E is for example a vertical direction, such as in the example of [Fig.l], or a direction forming an angle with the direction vertical.

[0030] Preferably, the enclosure 15 comprises side walls 18 and an upper wall 19 sealingly closing the upper 16 and lower 17 chambers.

[0031] In a particular example, the upper chamber 16 comprises at least one inlet opening, and the lower chamber 17 comprises at least one outlet opening.

[0032] The device 10 comprises a grid 22 separating the upper chamber 16 from the lower chamber 17 along the thickness direction E.

[0033] The grid 22 comprises through orifices 25 along the thickness direction E. In other words, each through orifice 25 opens on the one hand into the upper chamber 16 and on the other hand into the lower chamber 17.

[0034] The through-orifices 25 have, for example, a rounded, circular or oblong section, or even a polygonal section.

[0035] In a particular embodiment, the through-orifices 25 have a maximum dimension, in a plane perpendicular to the thickness direction E, of between 2 mm and 10 mm. Such a dimension corresponds for example to the diameter of a through-orifice 25 when the latter has a circular section.

[0036] The device 10 further comprises at least one compressor roller 30 movable in rotation about a central axis A-A' of the grid 22 and movable in rotation about an axis of rotation R of the compressor roller 30. The central axis A-A' extends for example in the direction of thickness E. The axis of rotation R of the compressor roller 30 is for example substantially perpendicular to the central axis A-A'.

[0037] In the example of [Fig.l], the device 10 comprises at least two, for example four, compressor rollers 30 angularly distributed around the central axis A-A'.

[0038] Each compressor roller 30 is for example driven in rotation around the central axis A-A' by a rotating central shaft 35, itself driven in rotation around the central axis A-A' by a motor, not shown.

[0039] The rotating central shaft 35 passes through the grid 22 in its center, for example.

[0040] Similarly, each compressor roller 30 is for example driven in rotation around the axis of rotation R by a motor, not shown, similar to or distinct from the motor of the central shaft 35.

[0041] Each compressor roller 30 is arranged in the upper chamber 16 of the enclosure 15, and comprises a lower end 36, located at all times at a minimum distance D, taken along the central axis A-A', from the grid 22.

[0042] In a particular embodiment, the grid 22 is movable in translation along the central axis A-A' so as to adjust the distance D between the grid 22 and the lower end 36 of the compressor rollers 30.

[0043] Alternatively, the grid 22 is fixed in the enclosure 15 and the compressor rollers 30 are movable in translation along the central axis A-A' so as to adjust the distance D between the grid 22 and the lower end 36 of the compressor rollers 30.

[0044] The device 10 is intended to implement a method of densifying at least one material 37 originating from a seat support element or intended for such a support element.

[0045] Generally, the material 37 is a material used or intended to be used in a seat support element, in order to provide comfort, flexibility and / or to give its aesthetic appearance to the support element. The material 37 is more particularly used to form the padding and / or the cover of a seat support element, such as a seat and / or a seat back.

[0046] When the material 37 is used to form the padding, the material 37 is for example a foam.

[0047] When the material 37 is used to form the cap, the material 37 is for example a natural or synthetic textile and / or is a natural or synthetic skin such as leather.

[0048] The material 37 is also, for example, a combination comprising at least one portion of foam padding, and at least one portion of cover. In particular, the material 37 is, for example, solely made up of at least one portion of foam padding and at least one portion of cover.

[0049] For example, the material 37 is a trim material (i.e. padding) of an automobile seat, such as a flexible component, such as a low-density polyurethane foam, or polyethylene terephthalate, and / or is a covering material such as a cover comprising for example a coated textile (TEP) such as vinyl, and / or a woven or non-woven textile, and / or a skin such as leather, and / or imitation leather.

[0050] The material 37 comes for example from a car seat, in production or at the end of its life.

[0051] Generally speaking, the material 37 is for example polyurethane, polyethylene terephthalate, or even polyamide.

[0052] The method of densifying at least one such material 37 will now be described in detail.

[0053] In a particular embodiment, the method comprises a preliminary step of dismantling a vehicle seat S arranged on a vehicle floor P, as shown in [Fig.2].

[0054] The preliminary disassembly step consists, for example, in removing the seat support element (the padding and / or the cover) from the frame 42 of the seat S in order to recover the material 37 while leaving the frame 42 of the seat S in whole or in part in place on the floor of the vehicle, as shown in [Fig. 3].

[0055] Since the frame 42 is left intact on the floor of the vehicle, it is possible to subsequently assemble new padding and a new cover on the frame 42 in order to obtain a new seat more efficiently.

[0056] In a particular embodiment, the method comprises a preliminary step of grinding a vehicle seat support element.

[0057] Thus, in the case where the material 37 comes from an already formed seat support element, the seat support (padding and / or cover) is crushed, possibly sorted and decontaminated as will be described in more detail later, in order to recover the material 37 to be compacted.

[0058] The method then comprises a first step of providing at least a first volume 40 of at least the material 37 in the densification device 10.

[0059] According to one embodiment, the first volume 40 is formed from several materials, for example the material forming the padding and the material forming the cover of the support element.

[0060] In particular, the first volume 40 of material 37 is introduced through the inlet opening of the upper chamber 16 into the upper chamber 16.

[0061] In the aforementioned case in which the material 37 comes from an already formed seat support element, the first volume 40 comes from the grinding of the seat support element.

[0062] In the case where the material 37 is intended to be used in a seat support element, the first volume 40 is for example initially provided.

[0063] For example, each first volume 40 of material 37 has a maximum dimension, in a plane perpendicular to the thickness direction E, of between 5 mm and 50 mm, in particular of between 10 mm and 40 mm. Thus, each first volume 40 is in the form of a cluster or conglomerate of one or more materials 37.

[0064] In order to maximize the compaction efficiency, a sufficient volume of material 37 is introduced into the upper chamber 16. In particular, the level of the free surface above the volume of material 37 introduced into the upper chamber 16 is located at least above the axis of rotation R of the compacting rollers 30 along the central axis A-A'.

[0065] A lower layer of the first volumes 40 of material 37 is thus deposited, in particular by gravity, in contact with the grid 22, in particular between the grid 22 and the lower end 36 of the compressor rollers 30 along the central axis A-A'.

[0066] In a particular embodiment, the temperature of the material in the enclosure 15 is increased to a threshold temperature greater than 40°C. For example, the threshold temperature is between 50°C and 180°C.

[0067] This step is for example carried out naturally by the friction generated between the material 37 and the lower end 36 of the rollers 30, and / or is accompanied by an increase in temperature in the enclosure 15 generated by a heating system, not shown, present in the enclosure 15. The heating system makes it possible, for example, to accelerate the heating of the material 37 and thus accelerate the compaction process. Such a heating system also makes it possible to ensure better control of the temperature of the material.

[0068] The choice of using an additional heating system depends in particular on the type of material 37 to be compacted.

[0069] The value of the threshold temperature depends in particular on the type of material 37 to be compacted. Generally, the threshold temperature is strictly lower than the melting temperature of said material 37.

[0070] Thus, such a temperature in the enclosure 15 helps with the densification by compaction of the material 37 without causing vitrification of the material 37 which could complicate the delicate recycling thereafter.

[0071] In particular, vitrification of the material 37 would lead to excessive hardening of the external surface of the material 37, which would then be relatively impermeable to any chemical product used during recycling.

[0072] Thus, the method of densifying the material 37 according to the invention is such that the material 37, in the compacted state, is still slightly aerated and allows for easy recycling of the material 37, while limiting the oxidation of the material 37 due to an excessively large quantity of air present in the material 37.

[0073] The densification method then comprises steps of rotating the compressor rollers 30 around the axis of rotation R and / or around the central axis A-A', and of compressing the first volume 40 by the compressor roller 30 between the compressor roller 30 and the grid 22.

[0074] These two steps are carried out successively, in parallel or the rotation step is carried out after the compression step.

[0075] In a particular embodiment, the compression step is carried out by moving the grid 22 along the central axis A-A' so as to bring the grid 22 closer to the lower end 36 of the compressor rollers 30, or alternatively by bringing the compressor rollers 30 closer to the grid 22.

[0076] As the distance D decreases, each first volume 40 of material 37 between the grid 22 and the compressor rollers 30 is compacted against the grid 22, and in particular against the through-orifices 25 of the grid 22.

[0077] The grid 22, or alternatively the compressor rollers 30, is translated along the central axis A-A', for example until a pressure value is obtained in the first volume 40 of between 20 bars and 100 bars.

[0078] Such a pressure value is obtained for example when the distance D between the grid 22 and the lower end 36 of the compressor rollers 30 reaches a value between 8 mm and 0.05 mm and when the space between the lower end 36 and the grid 22 is occupied by the material to be densified.

[0079] Thus, each compressor roller 30 rotating around the axis of rotation R and / or around the central axis A-A', the lower end 36 of which is located at a distance D of between 8 mm and 0.05 mm from the grid 22, crushes and presses the first volumes 40 of material 37 located between the lower end 36 and the grid 22.

[0080] Such pressure applied to the first volume 40 makes it possible to pre-compact the first volume 40 in order to ensure good cohesion of the material.

[0081] The method then finally comprises a step of extruding into the lower chamber 17 of the enclosure 15 at least a second volume 45 of material 37 through the orifices 25 of the grid 22.

[0082] The pressure applied to the first volume 40 causes it to compact and move in the through orifices 25, in order to collect a second compacted volume 45 at the outlet of the orifices 25.

[0083] This step conditions the compression ratio obtained between the first volume 40 and the second volume 45. In particular, the compression ratio depends on the diameter of the orifices 25 and the thickness, taken along the thickness direction E, of the grid 22.

[0084] Ratios of the diameter of the orifices 25 to the thickness of the grid 22 of between 0.1 and 0.5 are for example used to obtain the second compacted volume 45.

[0085] Generally speaking, the diameter of the orifices 25 and the thickness of the grid 22 are parameters to be adapted according to the material 37 to be compacted.

[0086] The second volume 45 is strictly less than the first volume 40 and the density of the material 37 in the second volume 45 is strictly greater than the density of the material 37 in the first volume 40.

[0087] For example, the second extruded volume 45 has a maximum dimension, in a plane perpendicular to the thickness direction E, of between 2 mm and 10 mm, corresponding to the largest dimension of the section of a through-orifice 25. Each second volume 45 is thus in the form of a compacted element or a pellet having a shape substantially complementary to a through-orifice 25, at least in section.

[0088] Optionally, the method comprises a step of cutting the extruded second volumes 45 to obtain second volumes 45 of the same dimension along the thickness direction E. This optional step makes it possible, for example, to simplify the storage of the second volumes 45.

[0089] The cutting step is for example implemented with a blade scraping the grid 22 on the side of the lower chamber 17 in order to cut each second volume 45 for give them a height, taken along the thickness direction E, which is substantially equal.

[0090] Such a method implemented with padding made of polyurethane foam, makes it possible for example to obtain a compaction ratio, defined as the ratio of the second volume 45 to the first volume 40, of between 5% and 30%.

[0091] Advantageously, the pressure applied to the first volume 40, in particular coupled with a slightly elevated temperature in the enclosure 15, makes it possible, during compression, to compact the first volume 40 of material 37, while ensuring that the material 37 does not return to its initial volume by elastic return.

[0092] In a particular embodiment, when the material 37 is composed of at least one padding part and at least one cover part of a seat support element, the method comprises for example a step of separating the padding part and the cover part.

[0093] Preferably, this separation step is carried out upstream of the step of supplying the first volume 40.

[0094] For example, before grinding the seat support element in order to recover the material 37, a cut of the support element is made in order to separate the padding from the cover.

[0095] The densification process is then implemented with the recovered padding alone, or with the recovered cover alone.

[0096] In a variant, the step of separating the padding part and the cover part is carried out after obtaining the second volume 45 of material 37.

[0097] In this case, the separation is carried out, for example, using a chemical process or using a mechanical process such as sorting by infrared light, for example.

[0098] In a particular embodiment, the method comprises a step of decontaminating the material 37, following the grinding of the seat support element and implemented before the step of supplying the first volume 40 of material 37.

[0099] The decontamination step makes it possible to reduce the quantity of non-compressible impurities present in said material 37.

[0100] For example, the soft materials, such as foam, fabric or skins such as leather, of the seat support element are separated from the hard materials being in particular elements for fixing the cover and / or the padding on the seat, such as metals, rigid plastics, etc.

[0101] The elements for fixing the cover and / or the padding to the seat are, for example, metal rods or rigid plastic clips.

[0102] For example, the separation of soft materials and hard materials is done, among other things, according to an apparent density value of the materials. For example, materials are considered soft when their apparent density is less than 100 kg / m3, and materials are considered hard when their apparent density is greater than 800 kg / m3. For materials with an apparent density between these two values, the selection of materials to be compacted is made according to parameters other than their apparent density alone, such as their hardness or elasticity or other.

[0103] In a particular embodiment, the method also comprises a step of adding a binder to the first volume 40 of material 37, carried out simultaneously or after the step of supplying the first volume 40 in the upper chamber 16.

[0104] The binder is configured to improve the agglomeration of the material 37 of the first volume 40 during compression.

[0105] For example, the binder used is chosen from starch, polyurethane, high or low density polyethylene, or even an epoxy resin, or a combination of these.

[0106] The binder is for example initially supplied in powder form.

[0107] In order to add the binder to the material 37 in the upper chamber 16, the method may comprise a step of diluting the binder, for example in an ethanol or dichloromethane solution, until a binder concentration of 0.5% to 10% is obtained. The first volumes 40 are then impregnated with said concentrated solution. After drying the first volumes 40, the steps of rotating the compressor rollers 30, compressing the first volume 40 and extruding the second volume 45 are implemented.

[0108] Alternatively, in order to add the binder to the material 37 in the upper chamber 16, the method may comprise a step of heating the binder. The heated binder is then mixed with the first volumes 40 in the upper chamber 16. Heating the binder in particular makes it possible to activate its cohesion properties.

[0109] Advantageously, the binder makes it possible to accelerate the agglomeration of the material 37 during compression in order to obtain a second dense and compact volume 45.

[0110] In a particular embodiment, the method advantageously comprises a final step of recycling the second volume 45 of material 37 in order to form a recycled seat support element.

[0111] For example, when the second volume 45 comprises only a cover material (for example because the first volume 40 comprises only a cover material or after separation of the mattress and the cover after obtaining the second volume 45), the second volume 45 obtained is recycled in order to manufacture a new cover of a seat support element.

[0112] Similarly, when the second volume 45 comprises only a sure mattress material (for example because the first volume 40 comprises only a padding material or after separation of the padding and the cover after obtaining the second volume 45), the second volume 45 obtained is recycled in order to manufacture a new padding of a seat support element.

[0113] In another example, it is possible to recycle the second volume 45, comprising a padding part and a cover part (which has therefore not undergone the optional step of separating the padding part and the cover part) in order to manufacture new padding for a seat support element.

[0114] Such a densification process has many advantages.

[0115] First of all, the method allows efficient compaction and densification of the first volume of material, into a second volume strictly less than the first volume and having a density strictly greater than that of the first volume.

[0116] Thus, the method facilitates the storage and transport of the second volume of material which can be stored in a limited storage space. The costs related to logistics (transport and storage of the material) are then minimized.

[0117] Furthermore, the second volume of material having a higher density, it is easily handled and recycled. Indeed, its high density allows it to be easily introduced into a machine capable of carrying out chemical reactions allowing the recycling of the material, without risk of loss of materials, as could be the case with a friable, low-density material.

[0118] Finally, since the second volume of material has a reduced quantity of air due to compression, the efficiency of recycling is improved. Indeed, the chemical reactions implemented for recycling are not disturbed by the presence of air and the oxidation of the materials is limited.

[0119] Finally, the compacting process makes it possible to recycle the support elements of a seat efficiently, in order to manufacture a seat comprising recycled padding and / or a cover.

Claims

Claims

1. Method for densifying at least one material (37) originating from a seat support element (S) or intended for such a support element, comprising the following steps: - providing at least a first volume (40) of a material (37) originating from a vehicle seat support element or intended for such a support element in a densification device (10) comprising an enclosure (15) provided with a grid (22) comprising through-orifices (25) in a thickness direction (E), and at least one compressor roller (30) rotatable about a central axis (A-A') of the grid (22) and rotatable about an axis of rotation (R) of the compressor roller (30), the grid (22) separating the enclosure (15) between an upper chamber (16) and a lower chamber (17) in the thickness direction (E), said compressor roller (30) and said first volume (40) being arranged in the upper chamber (16) of the enclosure (15), - rotating the steamroller (30) around the axis of rotation (R) and / or around the central axis (A-A'), - compression of the at least one first volume (40) by the compressor roller (30) between the compressor roller (30) and the grid (22), - extrusion into the lower chamber (17) of the enclosure (15) of at least a second volume (45) of material (37) through the orifices (25) of the grid (22), the second volume (45) being strictly less than the first volume (40) and the density of the material in the second volume (45) being strictly greater than the density of the material in the first volume (40).

2. Method according to claim 1, in which the material (37) is composed of at least one padding part and at least one cover part of a seat support element, the method comprising a step of separating the padding part and the cover part, the separation step preferably being carried out upstream of the step of providing the first volume (40).

3. Method according to claim 1 or 2, comprising a preliminary step of grinding a vehicle seat support element (S), the first volume (40) of material (37) being derived from said grinding.

4. A method according to claim 1 or 2, wherein the material (37) is a foam, and / or is a natural or synthetic textile and / or is a natural or synthetic skin.

5. Method according to any one of the preceding claims, in which the through orifices (25) of the grid (22) have a maximum dimension, in a plane perpendicular to the thickness direction, of between 2 mm and 10 mm, the second extruded volume (45) having a maximum dimension, in a plane perpendicular to the thickness direction (E), of between 2 mm and 10 mm.

6. Method according to any one of the preceding claims, in which the grid (22) is movable in translation along the central axis (A-A'), the step of compressing the at least one first volume (40) by the compressor roller (30) between the compressor roller (30) and the grid (22) being implemented by moving the grid (22) along the central axis (A-A') so as to bring the grid (22) closer to the or each compressor roller (30).

7. Method according to claim 6, in which the step of compressing the first volume (40) is carried out until a pressure value in the first volume (40) of between 20 bars and 180 bars is obtained.

8. Method according to any one of the preceding claims, comprising a step of decontaminating the first volume (40) of material (37), before the step of providing at least a first volume (40), the decontamination step being configured to reduce the quantity of non-compressible impurities present in said material (37).

9. A method according to any one of the preceding claims, comprising a step of adding a binder to the at least one first volume (40) of material (37) before the step of compressing the at least one first volume (40), the binder being configured to improve the agglomeration of the material (37) of the first volume (40) during compression.

10. A method according to any preceding claim, wherein the material (37) is composed of at least one part of a mattress and / or at least one part of a cover of a seat support element (S), the method comprising a preliminary step of dismantling a vehicle seat (S) placed on a vehicle floor (P), the preliminary step consisting of removing part of the padding and / or the cover of the frame (42) of the seat (S) in order to recover the material (37) while leaving the seat frame (42) in whole or in part in place on the floor (P) of the vehicle.

11. Cover or padding of a seat support element made from the second volume (45) obtained at the end of the densification process according to claim 2, the padding being preferentially made with the second volume (45) from the padding part of the material (37) after separation of the padding part and the cover part.

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