FILAMENTARY THERMOPLASTIC RECYCLING PROCESS

Abstract

METHOD FOR RECYCLING THERMOPLASTIC FILAMENTS The invention relates to a recycling method (100) applicable to thermoplastic filaments (52) mixed with unwanted materials (54). The recycling method comprises a feeding step (102), a spreading step (103). The method continues with a horizontal cutting step (104) where the sheet of thermoplastic filaments (52) and unwanted materials (54) is leveled, then a first cutting step (106) where the sheet is cut along a first vertical direction, and a second cutting step (108) where the sections of the sheet are cut along a second vertical direction orthogonal to the first vertical direction. The process continues with a shredding step (118), a threshing step (120), a pre-crushing step (122), an agglomeration step (124), a grinding step (126), a separation step (128), and finally a recovery step (130). Fig. 1

Description

Title of the invention: METHOD FOR RECYCLING FILAMENTARY THERMOPLASTICS Technical field

[0001] The present invention relates to a method for recycling filamentary thermoplastics contaminated by other materials, in particular high-density polyethylene (HDPE) nets, as well as a recycling line comprising the means for implementing said recycling method. STATE OF THE PRIOR ART

[0002] The use of HDPE nets is currently widespread. For example, such nets are used in agriculture to tie round bales of straw.

[0003] Patent EP-B-3 141 365 discloses a process for recycling filamentary thermoplastics, but under certain conditions, the separation between the filaments and the unwanted materials remains difficult. Statement of the invention

[0004] An object of the present invention is to propose a method for recycling filamentary thermoplastics, in particular from packaging, which does not have the drawbacks of the prior art and which in particular allows efficient recycling by separating the filaments and the unwanted materials.

[0005] To this end, a recycling process is proposed which applies to thermoplastic filaments mixed with undesirable materials, the recycling process successively comprising:

[0006] - a feeding step during which the thermoplastic filaments and the unwanted materials are placed in bundles on a horizontal conveyor belt,

[0007] - a spreading step during which the thermoplastic filaments and the unwanted materials are spread horizontally to form a sheet,

[0008] - a horizontal cutting step during which the sheet of thermo filaments plastics and unwanted materials are leveled in a direction parallel to the conveyor belt,

[0009] - a stretching and shaking step during which the sheet thus leveled is stretched and shaken,

[0010] - a first cutting step during which the sheet of thermo filaments plastics and unwanted materials are cut in a first vertical direction, forming sections,

[0011] - a second cutting step during which the sections of sheets of thermoplastic filaments and unwanted materials are cut according to a second vertical direction orthogonal to the first vertical direction,

[0012] - a first suction step during which the thermoplastic filaments and the unwanted materials thus cut are sucked upwards,

[0013] - a fraying step during which the thermoplastic filaments and the unwanted materials thus sucked up are frayed,

[0014] - a beating step during which the thermoplastic filaments and the unwanted materials thus frayed are beaten,

[0015] - a pre-grinding step during which the thermoplastic filaments and the unwanted materials thus beaten are ground into fibrils of 12 to 15 mm,

[0016] - an agglomeration step during which the thermoplastic filaments and the unwanted materials thus ground are compacted in the form of thermoplastic agglomerates, while the unwanted materials and a small part of the non-agglomerated thermoplastic fibrils mix and form fines,

[0017] - a grinding step during which the thermoplastic agglomerates and the fines are ground so as to standardize the size of the agglomerates to approximately 12 mm,

[0018] - a separation step during which the thermoplastic agglomerates and the fines thus ground and standardized are separated by gravimetry, and

[0019] - a recovery step during which the thermoplastic agglomerates thus separated from the fines are recovered and constitute the recycled thermoplastic.

[0020] Advantageously, the recycling process comprises between the first suction step and the shredding step:

[0021] - a misting step during which the thermoplastic filaments and the unwanted materials thus sucked up are moistened by a water mist,

[0022] - a mixing step during which the thermoplastic filaments and the unwanted materials thus moistened are stirred, and

[0023] - a second suction step during which the thermoplastic filaments and the unwanted materials thus stirred are sucked upwards.

[0024] Advantageously, the recycling process comprises, before the feeding step, a drying step during which the thermoplastic filaments and the waste undergo a reduction in humidity to 15%.

[0025] Advantageously, the recycling process comprises, after the recovery step, an extrusion step during which the recovered thermoplastic agglomerates undergo extrusion.

[0026] The invention also proposes a recycling line applicable to thermoplastic filaments mixed with undesirable materials and comprising successively:

[0027] - feeding means configured to deposit the thermoplastic filaments and unwanted materials onto a horizontal conveyor belt,

[0028] - spreading means configured to horizontally spread the thermal filaments- moplastics and unwanted materials in order to form a web,

[0029] - horizontal cutting means configured to level the web of thermal filaments plastics and unwanted materials in a direction parallel to the conveyor belt,

[0030] - stretching and shaking means configured to stretch and shake the web of thermoplastic filaments and unwanted materials,

[0031] - first cutting means configured to cut the sheet of thermal filaments moplastics and undesirable materials in a first vertical direction,

[0032] - second cutting means configured to cut sections of thermoplastic filaments and unwanted materials in a second vertical direction orthogonal to the first vertical direction,

[0033] - first suction means configured to suck the filaments upwards thermoplastics and unwanted materials,

[0034] - fraying means configured to fray thermoplastic filaments and unwanted materials,

[0035] - beating means configured to beat the thermoplastic filaments and the unwanted materials,

[0036] - pre-grinding means configured to grind the thermoplastic filaments and unwanted materials in the form of fibrils of 12 to 15 mm,

[0037] - agglomeration means configured to compact thermo fibrils plastics and unwanted materials in the form of thermoplastic agglomerates,

[0038] - grinding means configured to grind and uniformize the thermoplastic agglomerates moplastics to a size of approximately 12 mm,

[0039] - separation means configured to separate the agglomerates by gravimetry thermoplastics and fines, and

[0040] - recovery means configured to recover the thermo agglomerates plastics.

[0041] Advantageously, the stretching and shaking means comprise a grid having an upward slope along a transport direction between an inlet through which the web of thermoplastic filaments and undesirable materials is introduced and an outlet through which the web of thermoplastic filaments and undesirable materials is discharged, a plurality of combs with teeth and arranged horizontally and one after the other along the transport direction above the grid, and motorized means for moving the teeth in a rocking movement around a tilting axis horizontal and perpendicular to the transport direction.

[0042] Advantageously, the recycling line further comprises between the first suction means and the shredding means:

[0043] - misting means configured to humidify the thermo- filaments plastics and unwanted materials by water misting,

[0044] - stirring means configured to stir the thermoplastic filaments and unwanted materials, and

[0045] - second suction means configured to suck upwards the thermoplastic filaments and unwanted materials.

[0046] Advantageously, the recycling line comprises, before the feeding means, drying means configured to reduce the humidity level of the thermoplastic filaments and undesirable materials to 15%.

[0047] Advantageously, the recycling line comprises, after the recovery means, extrusion means configured to carry out extrusion of the thermoplastic agglomerates. Brief description of the drawings

[0048] The above-mentioned characteristics of the invention, as well as others, will appear more clearly on reading the following description of an exemplary embodiment, said description being made in relation to the attached drawings, among which:

[0049] [Fig-1] represents an algorithm of a recycling method according to the invention, and

[0050] [Fig.2] is a schematic representation of a pendulum shaker implemented within the framework of the invention.

[0051] DETAILED DESCRIPTION OF EMBODIMENTS

[0052] In the following description, terms relating to a position are taken with reference to the ground.

[0053] The single FIG. shows a recycling method 100 according to the invention.

[0054] The recycling method 100 applies to products made from thermoplastic filaments 52, in particular HDPE, contaminated by materials of different natures 54, called undesirable materials. These are, for example, nets made from HDPE loaded with straw residues and dust after use. The recycling method 100 makes it possible to best separate the thermoplastic filaments 52 and the undesirable materials 54 and to provide a recycled raw material based on the original thermoplastic called “secondary raw material”.

[0055] The recycling method 100 successively comprises:

[0056] - a feeding step 102 during which the thermoplastic filaments 52 mixed with unwanted materials 54 are placed in bundles on a horizontal conveyor belt,

[0057] - a spreading step 103 during which the thermoplastic filaments 52 and the unwanted materials 54 are spread horizontally so as to form a uniform sheet of thermoplastic filaments 52 and the unwanted materials 54 which is conducted to the next step,

[0058] - a horizontal cutting step 104 during which the sheet of thermal filaments moplastics 52 and unwanted materials 54 is leveled in a direction parallel to the conveyor belt, in particular to a thickness of the order of 8 to 10 cm,

[0059] - a stretching and shaking step 140 during which the sheet of filaments thermoplastics 52 and unwanted materials 54 thus leveled is stretched and shaken,

[0060] - a first cutting step 106 during which the sheet of thermo filaments plastics 52 and unwanted materials 54 is cut in a first vertical direction, in particular using a guillotine, forming sections,

[0061] - a second cutting step 108 during which the sections of sheets of thermoplastic filaments 52 and unwanted materials 54 are cut in a second vertical direction orthogonal to the first vertical direction, in particular using a guillotine,

[0062] - a first suction step 110 during which the thermo filaments plastics 52 and unwanted materials 54 thus cut are sucked upwards while the heavy elements fall downwards and are recovered and separated from the thermoplastic filaments 52,

[0063] - a fraying step 118 during which the thermoplastic filaments 52 and the unwanted materials 54 thus sucked up are frayed, that is to say unraveled by stretching which causes among other things the detachment of dust,

[0064] - a beating step 120 during which the thermoplastic filaments 52 and the unwanted materials 54 thus frayed are beaten allowing the separation of the thermoplastic filaments 52 and the unwanted materials 54,

[0065] - a pre-grinding step 122 during which the thermoplastic filaments 52 and the unwanted materials 54 thus beaten are ground into fibrils of 12 to 15 mm,

[0066] - an agglomeration step 124 during which the thermoplastic fibrils 52 and the unwanted materials 54 thus ground are compacted in the form of thermoplastic agglomerates, while the unwanted materials 54 and a small portion of non-agglomerated thermoplastic fibrils mix and form fines,

[0067] - a grinding step 126 during which the thermoplastic agglomerates and the fines are ground in such a way as to standardize the size of the agglomerates to approximately 12 mm (i.e. + / - 3 mm) which makes it possible to increase the apparent density and to have agglomerates which can be worked better subsequently,

[0068] - a separation step 128 during which the thermoplastic agglomerates and the fines thus ground and made uniform are separated by gravity, and

[0069] - a recovery step 130 during which the thermo agglomerates Plastics thus separated from the fines are recovered and stored and constitute recycled thermoplastic.

[0070] Such a recycling method 100 makes it possible to gradually eliminate the majority of the undesirable materials 54 mixed with the thermoplastic filaments 52, in particular in the case of HDPE nets, by separating the straw from the HDP. The method comprises a succession of steps which deconstruct the original materials according to different methods to separate each time a portion of the undesirable materials 54 from the thermoplastic filaments 52. In addition, the recycling method 100 does not use water, which avoids having to purify this water after treatment and thus makes the recycling method 100 particularly ecological and the stretching and shaking step 140 improves the separation of the thermoplastic filaments 52 and the undesirable materials 54.

[0071] According to a particular embodiment, in order to eliminate static electricity, the recycling method 100 comprises between the first suction step 110 and the shredding step 118:

[0072] - a misting step 112 during which the thermoplastic filaments 52 and the unwanted materials 54 thus sucked up are moistened by a water mist,

[0073] - a mixing step 114 during which the thermoplastic filaments 52 and the unwanted materials 54 thus moistened are stirred, and

[0074] - a second suction step 116 during which the thermo filaments plastics 52 and unwanted materials 54 thus mixed are sucked upwards, while the heavy elements fall downwards and are recovered to exit the process.

[0075] The spreading step 103 makes it possible to form a sheet of thermoplastic filaments 52 and undesirable materials 54 which is sufficiently dense and regular to then be able to undergo the horizontal cutting step 104.

[0076] The cutting steps 104, 106 and 108 make it possible to cut the thermoplastic filaments 52 in three directions and to limit the size of the thermoplastic filaments 52 and the undesirable materials 54 and thus to prevent these thermoplastic filaments 52 from catching during subsequent steps.

[0077] The stretching and shaking step 140 ensures better separation of the thermoplastic filaments 52 and unwanted materials 54 before subsequent steps.

[0078] The suction steps 110, 116 make it possible to separate the light elements (thermoplastic filaments 52 and the plant fibers of the undesirable materials 54) from the heavy elements (certain undesirable materials 54) which are too heavy to be sucked up, such as for example piles of wet straw or gravel. In fact, the thermoplastic filaments 52 and the light elements of the undesirable materials 54 which remain mixed therein are sucked upwards while the heavy waste is evacuated downwards.

[0079] When present, the misting step 112 also promotes the sliding of the thermoplastic filaments 52 and unwanted materials 54 relative to each other. and subsequent combing and detangling.

[0080] The fraying step 118 is carried out for example using a machine called an “opener” which disentangles the tufts using opening cylinders fitted with points. The high-speed rotation of the cylinders divides and parallelizes the thermoplastic filaments 52 and retains part of the waste 54. The elements which are not disentangled are rejected.

[0081] The threshing step 120 is carried out for example using a machine called a “threshing machine” which comprises a plurality of spiked rollers arranged upwardly one after the other. By successive actions, the thermoplastic filaments 52 and the undesirable materials 54 are combed, which tends to separate and clean them. A portion of the undesirable materials 54 thus separated is rejected downwards while the thermoplastic filaments 52 and the remainder of the undesirable materials 54 (in particular plant fibers) continue their ascent until they exit the threshing machine.

[0082] The agglomeration step 124 consists of introducing the thermoplastic fibrils 52 and undesirable materials 54 into a machine called a “compactor” which generally has a fixed disk and a rotating mobile disk. The disks are radially grooved and the friction allows a rise in temperature which will agglomerate the thermoplastic fibrils 52 in the form of thermoplastic agglomerates. The compactor takes advantage of the agglomeration conditions which are different between the thermoplastic fibrils 52 and the undesirable materials 54 (in particular the plant fibers) which prevents the agglomeration of the thermoplastic fibrils 52 and the undesirable materials 54 between them.

[0083] The various steps are carried out by suitable machines. Between the various machines, the materials are preferably transported by a pneumatic conveyor which allows dust removal before entering the next machine, in particular by removing the dust which has been separated from the thermoplastic filaments 52 during the previous step. A particular embodiment of the separation consists of arranging a suction fan which generates sufficient depression to suck the materials leaving the machine into a pipe. Depending on the power of the fan, elements which are too heavy to be sucked up fall onto a collection belt. A particular embodiment of dust removal consists of separating the dust and the materials to be treated by means of filters and gravity.The small dust particles then pass through the filters and are evacuated with the air, while the thermoplastic filaments 52 and the larger unwanted materials 54 are blocked by the filters and fall, with the disappearance of the air flow lift, into the machine carrying out the subsequent treatment step.

[0084] A recycling line applying to thermoplastic filaments 52 mixed with undesirable materials 54, and implementing the recycling method 100 above then successively comprises:

[0085] - feeding means configured to deposit the thermoplastic filaments 52 mixed with unwanted materials 54 on the horizontal conveyor belt,

[0086] - spreading means configured to spread the thermoplastic filaments 52 and the unwanted materials 54 in order to form a uniform sheet of thermoplastic filaments 52 and unwanted materials 54 and conduct it to the following means,

[0087] - horizontal cutting means configured to level the sheet of thermal filaments moplastics 52 and undesirable materials 54 in a direction parallel to the conveyor belt, in particular with a thickness of the order of 8 to 10 cm,

[0088] - stretching and shaking means configured to stretch and shake the web of thermoplastic filaments 52 and unwanted materials 54 from the horizontal cutting means,

[0089] - first cutting means, such as for example a guillotine, configured to cutting the sheet of thermoplastic filaments 52 and unwanted materials 54 in a first vertical direction, in order to form sections,

[0090] - second cutting means, such as for example a guillotine, configured to cut the sections of sheets of thermoplastic filaments 52 and of undesirable materials 54 in a second vertical direction orthogonal to the first vertical direction,

[0091] - first suction means configured to suck the filaments upwards thermoplastics 52 and unwanted materials 54, while heavy elements fall downwards and are recovered,

[0092] - fraying means configured to fray thermoplastic filaments 52 and unwanted materials 54,

[0093] - beating means configured to beat the thermoplastic filaments 52 and unwanted materials 54,

[0094] - pre-grinding means configured to grind thermoplastic filaments 52 and unwanted materials 54 in the form of fibrils of 12 to 15 mm,

[0095] - agglomeration means configured to compact thermo fibrils plastics 52 in the form of thermoplastic agglomerates,

[0096] - grinding means configured to grind and thus standardize the agglomerates thermoplastics with a size of approximately 12 mm,

[0097] - separation means configured to separate the agglomerates by gravimetry thermoplastics and fines, and

[0098] - recovery means configured to recover the thermo agglomerates plastics.

[0099] In the case of the presence of misting, the recycling line comprises between the first suction means and the shredding means:

[0100] - misting means configured to humidify the thermo filaments plastics 52 and unwanted materials 54 by water misting,

[0101] - stirring means configured to stir the thermoplastic filaments 52 and unwanted materials 54, and

[0102] - second suction means configured to suck upwards the thermoplastic filaments 52 and unwanted materials 54.

[0103] The spreading means and the horizontal cutting means are for example constituted by an automatic loader from the company Pierret Industries called a “robot” which allows, thanks to retractable teeth animated by a back-and-forth movement, to spread the thermoplastic filaments 52 and the undesirable materials 54 towards an outlet channel where a sheet is formed and which has at the outlet a horizontal cutting system constituting the horizontal cutting means.

[0104] The stretching and shaking means consist for example of a pendulum shaker 200 such as that shown in side view in [Fig.2].

[0105] The pendulum shaker 200 has an inlet 200a through which the elements to be shaken, i.e., the web of thermoplastic filaments 52 and unwanted materials 54, are introduced and an outlet 200b through which the elements are discharged after being shaken and the elements move between the inlet 200a and the outlet 200b along a conveying direction 200c. The discharged elements comprise the web of thermoplastic filaments 52 and unwanted materials 54 minus a portion of the unwanted materials 54 which are extracted during shaking.

[0106] The pendulum shaker 200 comprises a frame 202 on which is mounted a grid 204 which has an upward slope along the transport direction 200c between the inlet 200a and the outlet 200b and which is perforated to allow the extraction of at least a portion of the undesirable materials 54 by gravity through the grid 204.

[0107] The pendulum shaker 200 comprises a plurality of combs 206 with teeth 206a where the combs 206 are arranged horizontally and one after the other along the transport direction 200c above the grid 204.

[0108] Each comb 206 is mounted to rotate on the chassis 202 around a tilting axis 206b horizontal and perpendicular to the transport direction 200c.

[0109] The pendulum shaker 200 also comprises motorized means for moving the teeth 206a in a pendulum movement around the tilting axis 206b.

[0110] In the embodiment of the invention presented here, the motorized means comprise a bar 208, a motor 210 and a connecting rod 212.

[0111] All the combs 206 are coupled to the bar 208 and each comb 206 is mounted articulated on the bar 208 around an axis of rotation 206c.

[0112] The motorized means also comprise the motor 210 whose motor shaft 210a is rotatable around a motor axis 210b horizontal and perpendicular to the transport direction 200c.

[0113] The motorized means also comprise the connecting rod 212, a first end of which is mounted to be able to rotate on the motor shaft 210a around a first axis 212a parallel to the motor axis 210b and offset relative to the latter, and a second end of which is mounted to be able to rotate on the bar 208 around a second axis 212b parallel to the motor axis 210b.

[0114] Thus, when the drive shaft 210a rotates, the first end of the connecting rod 212 makes a back and forth movement, which is transmitted to the second end.

[0115] Due to the movement of the second end, the bar 208 also performs a movement from bottom to top and vice versa and due to the pivot connection of the combs 206 around the tilting axis 206b, the combs 206 and therefore the teeth 206a perform rocking movements (double arrow 220) around the tilting axis 206b, which causes a stretching and shaking of the elements which separate and rise along the grid 204.

[0116] The web of thermoplastic filaments 52 and the remaining unwanted materials 54 are then transported from the outlet 200b to the first cutting means.

[0117] The first cutting means and the second cutting means consist, for example, of two guillotine cutters from the company Pierret Industries and called CT60.

[0118] The suction means consist, for example, of a transfer fan from the company Laroche and called VT 540 TR, and combined with a heavy body trapping system from the company Laroche and called ODT.

[0119] The misting means consist, for example, of a piping sizing unit from the Laroche company and called OT.

[0120] The mixing means consist, for example, of a mixing box from the company Laroche and called SM 3900. Such a device makes it possible to homogenize the elements to be separated.

[0121] The fraying means consist, for example, of an opener from the company Laroche and called Excel 2000.

[0122] The threshing means consist, for example, of a cleaning-threshing machine from the company Laroche NB 6T 2000.

[0123] The pre-crushing means consist, for example, of a grinder from the company Herbold and called SML 60 / 100-S5-2.

[0124] The agglomeration means consist, for example, of a buffer silo with an endless screw which forces the materials between the discs of the compactor consisting, for example, of a densifier from the company Herbold and called HV 70 / 250.

[0125] The grinding means consist, for example, of a grinder from the company Herbold and called SML 45 / 100-S4-2.

[0126] The separation means consist, for example, of a gravimetric separator from the company Herbold and called SZS 630 / 200.

[0127] The recovery means consist of any means allowing thermoplastic agglomerates to be stored, such as a silo for example.

[0128] The entire recycling line is grounded and the humidity level is controlled to eliminate static electricity that can form from friction of the plastic waste.

[0129] Prior to the feeding step 102, the thermoplastic filaments 52 and the undesirable materials 54 undergo a drying step. For this purpose, the recycling line comprises, before the feeding means, drying means such as, for example, a pulsed hot air dryer. This drying step makes it possible to lower the humidity level of the thermoplastic filaments 52 and the undesirable materials 54 to 15% (i.e. + / - 3%). Such drying subsequently prevents the overly wet elements from sticking together or in the machines.

[0130] The recycling method 100 may also have, after the recovery step 130, an extrusion step during which the recovered thermoplastic agglomerates undergo extrusion. To this end, the recycling line comprises, after the recovery means, extrusion means such as, for example, a suitable extruder.

Claims

Claims

1. Recycling method (100) applying to thermoplastic filaments (52) mixed with undesirable materials (54), the recycling method (100) successively comprising: - a feeding step (102) during which the thermoplastic filaments (52) and the unwanted materials (54) are deposited in bundles on a horizontal conveyor belt, - a spreading step (103) during which the thermoplastic filaments (52) and the unwanted materials (54) are spread horizontally so as to form a sheet, - a horizontal cutting step (104) during which the sheet of thermoplastic filaments (52) and unwanted materials (54) is leveled in a direction parallel to the conveyor belt, - a stretching and shaking step (140) during which the sheet thus leveled is stretched and shaken, - a first cutting step (106) during which the sheet of thermoplastic filaments (52) and undesirable materials (54) is cut in a first vertical direction, forming sections, - a second cutting step (108) during which the sections of sheets of thermoplastic filaments (52) and of undesirable materials (54) are cut in a second vertical direction orthogonal to the first vertical direction, - a first suction step (110) during which the thermoplastic filaments (52) and the unwanted materials (54) thus cut are sucked upwards, - a fraying step (118) during which the thermoplastic filaments (52) and the unwanted materials (54) thus sucked up are frayed, - a beating step (120) during which the thermoplastic filaments (52) and the unwanted materials (54) thus frayed are beaten, - a pre-grinding step (122) during which the thermoplastic filaments (52) and the unwanted materials (54) thus beaten are ground into fibrils of 12 to 15 mm, - an agglomeration step (124) during which the thermoplastic filaments (52) thus ground are compacted in the form of thermoplastic agglomerates, while the unwanted materials (54) and a small part of the non-agglomerated thermoplastic fibrils mix and form fines, - a grinding step (126) during which the thermoplastic agglomerates and the fines are ground so as to standardize the size of the agglomerates to approximately 12 mm, - a separation step (128) during which the thermoplastic agglomerates and the fines thus ground and standardized are separated by gravimetry, and - a recovery step (130) during which the thermoplastic agglomerates thus separated from the fines are recovered and constitute the recycled thermoplastic.

2. Recycling method (100) according to claim 1, characterized in that it comprises between the first suction step (110) and the fraying step (118): - a misting step (112) during which the thermoplastic filaments (52) and the unwanted materials (54) thus sucked are moistened by a mist of water, - a mixing step (114) during which the thermoplastic filaments (52) and the unwanted materials (54) thus moistened are mixed, and - a second suction step (116) during which the thermoplastic filaments (52) and the unwanted materials (54) thus mixed are sucked upwards.

3. Recycling method (100) according to one of claims 1 or 2, characterized in that it comprises, before the feeding step (102), a drying step during which the thermoplastic filaments (52) and the undesirable materials (54) undergo a reduction in the humidity level to 15%.

4. Recycling method (100) according to one of claims 1 to 3, characterized in that it comprises, after the recovery step (130), an extrusion step during which the recovered thermoplastic agglomerates undergo extrusion.

5. Recycling line applying to thermoplastic filaments (52) mixed with unwanted materials (54) and successively comprising: - feed means configured to deposit the thermoplastic filaments (52) and the unwanted materials (54) on a horizontal conveyor belt, - spreading means configured to horizontally spread the thermoplastic filaments (52) and the unwanted materials (54) in order to form a sheet, - horizontal cutting means configured to level the sheet of thermoplastic filaments (52) and unwanted materials (54) in a direction parallel to the conveyor belt, - stretching and shaking means configured to stretch and shake the web of thermoplastic filaments (52) and unwanted materials (54), - first cutting means configured to cut the sheet of thermoplastic filaments (52) and unwanted materials (54) in a first vertical direction, - second cutting means configured to cut sections of thermoplastic filaments (52) and unwanted materials (54) in a second vertical direction orthogonal to the first vertical direction, - first suction means configured to suck upwards the thermoplastic filaments (52) and the unwanted materials (54), - fraying means configured to fray the thermoplastic filaments (52) and the unwanted materials (54), - beating means configured to beat the thermoplastic filaments (52) and the unwanted materials (54), - pre-grinding means configured to grind the thermoplastic filaments (52) and the unwanted materials (54) in the form of fibrils of 12 to 15 mm, - agglomeration means configured to compact thermoplastic fibrils (52) in the form of thermoplastic agglomerates, - grinding means configured to grind and uniformize the thermoplastic agglomerates to a size of approximately 12 mm, - separation means configured to gravimetrically separate thermoplastic agglomerates and fines, and - recovery means configured to recover thermoplastic agglomerates.

6. Recycling line according to claim 5, characterized in that the stretching and shaking means (200) comprise a grid (204) having an upward slope along a transport direction (200c) between an inlet (200a) through which the web of thermoplastic filaments (52) and undesirable materials (54) is introduced and a outlet (200b) through which the web of thermoplastic filaments (52) and unwanted materials (54) is discharged, a plurality of combs (206) with teeth (206a) and arranged horizontally and one after the other along the transport direction (200c) above the grid (204), and motorized means for moving the teeth (206a) in a rocking motion around a tilting axis (206b) horizontal and perpendicular to the transport direction (200c).

7. Recycling line according to one of claims 5 or 6, characterized in that it further comprises between the first suction means and the fraying means: - misting means configured to moisten the thermoplastic filaments (52) and the unwanted materials (54) by a water mist, - stirring means configured to stir the thermoplastic filaments (52) and the unwanted materials (54), and - second suction means configured to suck upwards the thermoplastic filaments (52) and the unwanted materials (54).

8. Recycling line according to one of claims 5 to 7, characterized in that it comprises, before the feeding means, drying means configured to reduce the humidity level of the thermoplastic filaments (52) and the undesirable materials (54) to 15%.

9. Recycling line according to one of claims 5 to 8, characterized in that it comprises, after the recovery means, extrusion means configured to carry out an extrusion of the thermoplastic agglomerates.

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