Elastic hybrid reinforcing element

Abstract

The invention relates to a reinforcing element (50) comprising a plurality of strands (T) arranged in a single-layer arrangement with each strand (T) consisting of: - a core consisting of a textile filament element (36); and - a layer comprising at least two metal filament elements (38) helically wound around the core; wherein the diameter Df of each metal filament element (38) ranges from 0.04 to 0.10 mm.

Description

[0001] Elastic hybrid reinforcement element

[0002]

[0001] The invention relates to an elastic hybrid reinforcing element and to a method for manufacturing this reinforcing element. The invention also relates to a reinforced product comprising this reinforcing element and a tire comprising this same reinforcing element.

[0003]

[0002] In the tire sector, designers have long been looking for new reinforcements that can advantageously and effectively replace conventional reinforcement elements in order to achieve higher resistances with sufficient elongations.

[0004]

[0003] Known from the state of the art and in particular from EP0976541 are reinforcing elements comprising a carbon steel core and an external layer of stainless steel.

[0005]

[0004] Also known from the state of the art is application CN1 12439799 which describes a process for producing fine metal wires for making assemblies of the 7x3x0.06 mm type with an elongation at break of 2.79%.

[0006]

[0005] Reinforcing elements described in EP1293600 and DE1027539 are also known from the state of the art.

[0007]

[0006] The disadvantage of such reinforcements is that high mechanical strengths are obtained but at the cost of elongations that are too low for use in tires.

[0007] The aim of the invention is to find an elastic reinforcement element with very high performance: very high breaking strength for a small footprint, high extension modulus and very low flexural rigidity.

[0008]

[0008] To this end, the invention relates to a reinforcing element comprising several strands arranged in a single-layer arrangement with each strand consisting of: - a core consisting of a textile wire element and;

[0009] -a layer comprising at least two metallic wire elements wound in a helix around the core; in which the diameter Df of each metallic wire element ranges from 0.04 to 0.10 mm.

[0010]

[0009] Thanks to the presence of the textile core, it is possible to manufacture assemblies having a relatively small footprint and exhibiting bimodular behavior.

[0011]

[0010] By bimodule, we mean that the modulus is lowered at low deformations due to the presence of the textile core and the modulus is relatively high at high deformations in this case that of the metallic wire elements which proves sufficient to ensure, on its own, the endurance resistance performance.

[0012]

[0011] Figure 6 shows a force-elongation curve of a reinforcing element according to the invention. One effect of using a hybrid reinforcing element comprising an assembly of a textile core and fine metal wires is in particular to increase the modulus of the force-elongation curve. Indeed, on the one hand, the modulus is lowered at low deformations due to the presence of the textile core and on the other hand, the modulus is relatively high at high deformations, in this case that of the metal wire elements. Thus, an elastic reinforcing element with very high breaking strength, high extension modulus and very low flexural rigidity is obtained.

[0012] By constituted assembly, it is meant that the assembly does not comprise any wire elements other than the textile wire element and at least the two metal wire elements.

[0013]

[0013] By wire element is meant an element extending longitudinally along a main axis and having a section perpendicular to the main axis whose largest dimension G is relatively small compared to the dimension L along the main axis. By relatively small is meant that L / G is greater than or equal to 100, preferably greater than or equal to 1000. This definition covers both wire elements of circular section and wire elements of non-circular section, for example of polygonal or oblong section. Very preferably, each metal wire element has a circular section.

[0014]

[0014] By definition, the term “textile thread element” means a non-metallic thread element consisting of one or more elementary textile monofilaments optionally coated with one or more layers of a coating based on an adhesive composition. Each elementary textile monofilament is obtained, for example, by melt spinning, solution spinning or gel spinning. Each elementary textile monofilament is made of an organic material, in particular a polymeric material, or an inorganic material, such as glass or carbon. The polymeric materials may be of the thermoplastic type, such as aliphatic polyamides, in particular polyamides 6-6, and polyesters, in particular polyethylene terephthalate. The polymeric materials may be of the non-thermoplastic type, such as aromatic polyamides, in particular aramid, and cellulose, both natural and artificial, in particular rayon.

[0015]

[0015] By definition, the term "metal wire element" means a wire element consisting mainly (i.e. for more than 50% of its mass) or entirely (for 100% of its mass) of a metallic material. Each metal wire element is preferably made of steel, more preferably of pearlitic or ferrito-pearlitic carbon steel, commonly called carbon steel by those skilled in the art, or even of stainless steel (by definition, steel comprising at least 10.5% chromium).

[0016]

[0016] Preferably, each wire element comprises from 0.50 to 0.86% carbon.

[0017]

[0017] The reinforcing element according to the invention comprises a single layer of metal wire elements wound in a helix around the textile core. In other words, the reinforcing element according to the invention comprises a single, not two, nor more than two layers of metal wire elements wound in a helix around the textile core. The layer is made up of metal wire elements, i.e. several metal wire elements, not a single metal wire element.

[0018]

[0018] Any interval of values ​​designated by the expression "between a and b" represents the domain of values ​​going from more than a to less than b (i.e., limits a and b excluded) while any interval of values ​​designated by the expression "from a to b" means the domain of values ​​going from a up to b (i.e., including the strict limits a and b).

[0019] In the context of the invention, the carbon products mentioned in the description may be of fossil or bio-sourced origin. In the latter case, they may be, partially or totally, derived from biomass or obtained from renewable raw materials derived from biomass.

[0019]

[0020] Within the framework of the invention, it may also be envisaged that the carbon products mentioned in the description comprise isotopes of certain chemical elements.

[0020]

[0021] In one embodiment, the reinforcing element comprises a single layer of several strands, that is to say it comprises an assembly consisting of one layer of strands, no more and no less, that is to say the assembly has one layer of strands, not zero, not two, but only one.

[0021]

[0022] Advantageously, the winding direction of each strand is opposite to the winding direction of the reinforcing element.

[0022]

[0023] The winding direction of a layer of strands refers to the direction formed by the strands relative to the axis of the reinforcing element. The winding direction is commonly designated by the letter either Z or S.

[0023]

[0024] Strand winding directions are determined in accordance with ASTM D2969-04 of 2014.

[0024]

[0025] Advantageously, the number of metallic wire elements wound in a helix around the core ranges from 5 to 12 and preferably from 7 to 9.

[0025]

[0026] Advantageously, in one embodiment, the number of strands ranges from 1 to 5 and preferably from 1 to 4.

[0026]

[0027] Advantageously, the number of strands ranges from 3 to 5 and preferably it is chosen from 3 and 4.

[0027]

[0028] Advantageously, the total elongation at break of the reinforcing element At is greater than or equal to 4.00% determined by the ISO 6892-1 standard of October 2009.

[0028]

[0029] The total elongation At, a quantity well known to those skilled in the art, is determined, for example, by applying the ISO 6892-1 standard of October 2009 to a tested reinforcing element so as to obtain a stress-elongation curve. The At is deduced from the curve obtained as the elongation, in %, corresponding to the projection on the axis of elongations parallel to the elastic slope of the breaking point of the reinforcing element on the stress-elongation curve, i.e. the point at which the load increases up to a maximum stress value and then decreases abruptly after rupture. When the decrease in relation to the stress exceeds a certain threshold, this means that rupture of the reinforcing element has occurred.

[0029]

[0030] Advantageously, each metallic wire element has a breaking strength, noted Rm, such that Rm > 3400 MPa and preferably Rm > 4000 MPa.

[0030]

[0031] The breaking strength Rm is determined in mega Pascals, determined by the ISO 6892-1 standard of October 2009.

[0031]

[0032] Preferably, the diameter Df of each metal wire element ranges from 0.05 to 0.10 mm and preferably from 0.06 to 0.09 mm.

[0032]

[0033] Preferably, all wire elements have the same diameter.

[0033]

[0034] Advantageously, the diameter of each textile core wire element ranges from 0.05 to 0.20 mm and preferably from 0.10 to 0.17 mm.

[0035] Advantageously, the diameter of the reinforcing element ranges from 0.10 to 0.90 mm and preferably from 0.50 to 0.70 mm.

[0034]

[0036] The diameter or apparent diameter, noted D, is measured by means of a thickness comparator whose probe diameter is at least equal to 1.5 times the winding pitch P of the wire elements (for example, the JD50 model from the KAEFER brand can be used to achieve an accuracy of 1 / 100 of a millimeter, equipped with a type a probe, and having a contact pressure close to 0.6N). The measurement protocol consists of three repetitions of a series of three measurements (carried out perpendicular to the axis of the cable and under zero tension) of which the second and third of these measurements are carried out in a direction angularly offset from the previous one by a third of a turn, by rotating the measurement direction around the axis of the reinforcing element.

[0035]

[0037] Advantageously, in a first embodiment, the textile core comprises a single multifilament wire element.

[0036]

[0038] Advantageously, in a second embodiment, the textile core comprises several multifilament wire elements.

[0037]

[0039] Preferably, the multifilament thread element(s) are chosen from polyesters, aliphatic polyamides, aromatic polyamides or aromatic copolyamides and mixtures of filaments of these materials, preferably chosen from polyesters.

[0038]

[0040] By aromatic polyamide filament or aromatic copolyamide, it is well known that it is a filament of linear macromolecules formed of aromatic groups linked together by amide bonds of which at least 85% are directly linked to two aromatic nuclei, and more particularly of poly (p-phenylene terephthalamide) (or PPTA) fibers, manufactured for a very long time from optically anisotropic spinning compositions.Among the aromatic polyamides or aromatic copolyamides, mention may be made of polyarylamides (or PAA, known in particular under the trade name Ixef from the company Solvay), poly(metaxylylene adipamide), polyphthalamides (or PPA, known in particular under the trade name Amodel from the company Solvay), amorphous semi-aromatic polyamides (or PA 6-3T, known in particular under the trade name Trogamid from the company Evonik), meta-aramids (or poly(metaphenylene isophthalamide or PA MPD-I known in particular under the trade name Nomex from the company Du Pont de Nemours) or para-aramids (or poly(paraphenylene terephthalamide or PA PPD-T known in particular under the trade name Kevlar from the company Du Pont de Nemours or Twaron from the company Teijin).

[0039]

[0041] Polyester filament is a filament of linear macromolecules formed from groups linked together by ester bonds. Polyesters are manufactured by polycondensation by esterification between a dicarboxylic acid or one of its derivatives and a diol. For example, polyethylene terephthalate can be manufactured by polycondensation of terephthalic acid and ethylene glycol. Known polyesters include polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polybutylene terephthalate (PBT), polybutylene naphthalate (PBN), polypropylene terephthalate (PPT) and polypropylene naphthalate (PPN).

[0040]

[0042] Preferably, the count of each multifilament yarn element ranges from 20 to 210 tex, preferably from 20 to 50 tex, more preferably from 20 to 30 tex.

[0041]

[0043] The count (or linear density) of each multifilament yarn element is determined according to ASTM D1423. The count is given in tex (weight in grams of 1000 m of product - reminder: 0.1 11 tex equals 1 denier).

[0042]

[0044] The invention also relates to a method for manufacturing a reinforcing element in which at least two metal wire elements are assembled in a helix around a core consisting of a textile wire element by twisting in one direction to form a strand in which the diameter Df of each metal wire element ranges from 0.04 to 0.10 mm.

[0043]

[0045] The invention also relates to a method for manufacturing a reinforcing element in which at least two metal wire elements are assembled in a helix around a core consisting of a textile wire element by twisting in one direction to form a strand in which the diameter Df of each metal wire element ranges from 0.04 to 0.10 mm, the assembly step is repeated to obtain at least two strands and several strands are assembled in a helix by twisting in the opposite direction to the strand assembly step to form a reinforcing element.

[0044]

[0046] By twisting assembly method according to the invention, it is meant that the wire elements or strands undergo both a collective twist and an individual twist around their own axis, which generates an untwisting torque on each of the wire elements or strands.

[0045]

[0047] Conversely, by cabling assembly process, we mean that the wire elements or strands do not undergo torsion around their own axis, due to a synchronous rotation before and after the assembly point.

[0046]

[0048] In one embodiment of the method according to the invention, upstream of the assembly of the strand, a step of balancing each strand is carried out and each strand is then stored on a receiving reel, for storage, before the subsequent assembly operation.

[0047]

[0049] Downstream of the helical assembly of the strands by twisting to form a reinforcing element, a final twist balancing step is carried out in order to stabilize the architecture of the reinforcing element.

[0048]

[0050] By "torsion balancing" is meant here, in a manner well known to those skilled in the art, the cancellation of residual torsional torques (or elastic torsional return) exerted on each wire element of the strand.

[0049]

[0051] It is recalled that, in a known manner, the pitch of a strand represents the length of this strand, measured parallel to the axis of the reinforcing element, at the end of which the strand having this pitch makes a complete turn around said axis of the reinforcing element. Similarly, the pitch of a wire represents the length of this wire, measured parallel to the axis of the strand in which it is located, at the end of which the wire having this pitch makes a complete turn around said axis of the strand.

[0050]

[0052] The winding direction of a layer of strands or wire elements means the direction formed by the strands or wire elements relative to the axis of the reinforcing element or strand. The winding direction is commonly designated by the letter either Z or S.

[0051]

[0053] The pitches, winding directions and diameters of the wire elements and strands are determined in accordance with ASTM D2969-04 of 2014. The winding radii are measured by microscopic observation on a section of the reinforcing element made along an axis perpendicular to the axis of the reinforcing element.

[0052]

[0054] Another subject of the invention is a reinforced product comprising a reinforcing element as described above.

[0053]

[0055] Such reinforced products are pipes, belts, conveyor belts, tracks, tires for vehicles, both in the raw state (i.e. before crosslinking or vulcanization) and in the cured state (after crosslinking or vulcanization). Such reinforced products take, in preferred embodiments, the form of a sheet or strips.

[0054]

[0056] Finally, another subject of the invention is a tire comprising at least one reinforcing element as described above or a reinforced product as described above.

[0055]

[0057] Preferably, the tire comprises a crown comprising a tread and a crown reinforcement, two sidewalls, two beads, each sidewall connecting each bead to the crown, the crown reinforcement extending in the crown in a circumferential direction of the tire, the tire comprising a carcass reinforcement anchored in each of the beads and extending in the sidewalls and in the crown, the crown reinforcement being radially interposed between the carcass reinforcement and the tread, the crown reinforcement comprising at least one reinforcing element as defined above.

[0056]

[0058] In an advantageous embodiment, the hoop reinforcement comprises a single hoop ply. The hoop reinforcement is preferably constituted by a hoop ply comprising the reinforcing element according to the invention. This embodiment is particularly suitable for a tire for passenger vehicles, two-wheeled vehicles, industrial vehicles chosen from vans, "Heavy goods vehicles", for example metro, bus, road transport vehicles (trucks, tractors, trailers), and preferably for passenger vehicles.

[0057]

[0059] In an advantageous embodiment, the hoop reinforcement is radially interposed between the working reinforcement and the tread. Thus, thanks to the use of metal cables, the hoop reinforcement performs, in addition to its hooping function, a much more effective protection function against perforations and impacts than a hoop reinforcement comprising textile hoop reinforcement wire elements.

[0058]

[0060] In an advantageous embodiment, the or each wire reinforcement element of the hooping makes an angle strictly less than 10°, preferably less than or equal to 7° and more preferably less than or equal to 5° with the circumferential direction of the tire.

[0061] The invention will be better understood by reading the examples which follow, given solely as non-limiting examples and made with reference to the drawings in which:

[0059] - Figure 1 is a sectional view perpendicular to the circumferential direction of a tire (10) according to the invention;

[0060] - Figure 2 is a sectional view of a reinforced product (R) according to the invention;

[0061] - figure 3 is a sectional view perpendicular to its axis of a reinforcing element (50) according to an embodiment of the invention (assumed to be rectilinear and at rest);

[0062] - figure 4 is a sectional view perpendicular to its axis of a reinforcing element (60) according to another embodiment of the invention (assumed to be rectilinear and at rest);

[0063] - Figure 5 is a photograph of a reinforcing element (50) according to one embodiment of the invention; and

[0064] - Figure 6 illustrates part of the stress-elongation curve for a reinforcing element according to the second embodiment of the invention and a reinforcing element of the state of the art.

[0065] EXAMPLE OF A TIRE ACCORDING TO THE INVENTION

[0066]

[0062] In Figure 1, there is shown a reference X, Y, Z corresponding to the usual directions respectively axial (X), radial (Y) and circumferential (Z) of a tire.

[0067]

[0063] Figure 1 schematically shows a radial sectional view of a tire according to the invention and designated by the general reference 10. The tire 10 is substantially of revolution around an axis substantially parallel to the axial direction X. The tire 10 is here intended for a passenger vehicle.

[0068]

[0064] The tire 10 comprises a crown 12 comprising a crown reinforcement 14 comprising a working reinforcement 15 comprising two working plies 16, 18 respectively comprising working reinforcing wire elements and a hoop reinforcement 17 comprising a hoop ply 19 comprising at least one hoop reinforcement wire element. The crown reinforcement 14 extends in the crown 12 in the circumferential direction Z of the tire 10. The crown 12 comprises a tread 20 arranged radially outside the crown reinforcement 14. Here, the hoop reinforcement 17, here the hoop ply 19, is radially interposed between the working reinforcement 15 and the tread 20. Here, the working reinforcement 15 comprises only two working plies 16, 18 and the hoop reinforcement 17 comprises a single hoop ply 19.Here, the working reinforcement 15 is made up of the two working plies 16, 18 and the hoop reinforcement 17 is made up of the hoop reinforcement 19. The crown reinforcement 14 is made up of the working reinforcement 15 and the hoop reinforcement 17.

[0069]

[0065] The tire 10 also comprises two sidewalls 22 extending the crown 12 radially inwards. The tire 10 further comprises two beads 24 radially inside the sidewalls 22 and each comprising an annular reinforcing structure 26, in this case a bead wire 28, surmounted by a mass of rubber 30 for bead-core filling, as well as a radial carcass reinforcement 32. Each sidewall 22 connects each bead 24 to the crown 12.

[0066] The carcass reinforcement 32 comprises a carcass ply 34 comprising several carcass reinforcing wire elements, the carcass ply 34 being anchored to each of the beads 24 by a turn-up around the bead wire 28, so as to form in each bead 24 a forward strand 38 extending from the beads through the sidewalls towards the crown 12, and a return strand 40, the radially outer end 42 of the return strand 40 being radially outside the annular reinforcing structure 26.The carcass reinforcement 32 thus extends from the beads 24 into and through the sidewalls 22 into the crown 12. The carcass reinforcement 32 is arranged radially inside the crown reinforcement 14 and the hoop reinforcement 17. The crown reinforcement 14 is therefore radially interposed between the carcass reinforcement 32 and the tread 20. The carcass reinforcement 32 comprises a single carcass ply 34. Here, the carcass reinforcement 32 is made up of the carcass ply 34.

[0070]

[0067] The tire 10 also comprises an internal sealing layer, preferably made of butyl, located axially inside the sidewalls 22 and radially inside the crown reinforcement 14 and extending between the two beads 24.

[0071]

[0068] Each working ply 16, 18, hooping ply 19 and carcass ply 34 comprises an elastomeric matrix in which reinforcing elements of the corresponding ply are embedded. Each elastomeric matrix of the working ply 16, 18, hooping ply 19 and carcass ply 34 is based on a conventional elastomeric composition for calendering reinforcing elements conventionally comprising a diene elastomer, for example natural rubber, a reinforcing filler, for example carbon black and / or silica, a crosslinking system, for example a vulcanization system, preferably comprising sulfur, stearic acid and zinc oxide, and optionally a vulcanization accelerator and / or retarder and / or various additives.

[0072]

[0069] Here the hooping sheet 19 comprises at least one reinforcing element 50 as described below.

[0073]

[0070] EXAMPLE OF REINFORCED PRODUCT ACCORDING TO THE INVENTION

[0074]

[0071] Figure 2 shows a reinforced product according to the invention and designated by the general reference R. The reinforced product R comprises at least one reinforcing element 50, in this case several reinforcing elements 50, embedded in the polymer matrix Ma.

[0075]

[0072] In Figure 2, the polymer matrix Ma is represented, the reinforcing elements 50 in a reference frame X, Y, Z in which the direction Y is the radial direction and the directions X and Z are the axial and circumferential directions. In Figure 2, the reinforced product R comprises several reinforcing elements 50 arranged side by side in the main direction X and extending parallel to each other within the reinforced product R and collectively embedded in the polymer matrix Ma.

[0076]

[0073] Here, the polymeric matrix Ma is an elastomeric matrix based on an elastomeric composition.

[0077]

[0074] METHOD FOR MANUFACTURING THE REINFORCING ELEMENT ACCORDING TO THE INVENTION

[0075] We will now describe an example of a method for manufacturing the reinforcing element 50.

[0078]

[0076] 9 metal wire elements are assembled in a helix around a core made of a polyester textile wire element by twisting at a twist of 145 turns per meter in one direction to form a strand.

[0079]

[0077] 3 strands are then assembled by twisting at a twist of 570 turns per meter in the opposite direction to the twisting of the strand to form the reinforcing element 50.

[0080]

[0078] EXAMPLE OF A REINFORCING ELEMENT ACCORDING TO THE INVENTION

[0081]

[0079] Figure 3 shows the reinforcing element 50 according to one embodiment of the invention.

[0082]

[0080] Figure 5 shows a photograph of the reinforcing element 50 in the polymer matrix.

[0083]

[0081] The reinforcing element 50 comprises at least one assembly consisting of:

[0084] - a core consisting of a textile wire element 36 and;

[0085] - a layer comprising at least two metal wire elements 38 wound helically around the core; wherein the diameter Df of each metal wire element (38) ranges from 0.04 to 0.10 mm. Here there are 9 metal wires 36 with a diameter Df = 0.06 mm. And the assembly is arranged in the form of one or more strands arranged in a single-layer arrangement, here there are 3 strands with 3 assemblies, each consisting of a core which is a PET monofilament with a diameter of 0.15 mm and 9 metal wires wound around this textile core.

[0086]

[0082] Table 1 below summarizes the characteristics for the different reinforcing elements 50 according to one embodiment of the invention, 60 according to another embodiment of the invention which is shown in Figure 4 and that of the state of the art EDT of application CN1 12439799. The term NC means that there is no data in the patent application.

[0087] The total elongation is determined for the reinforcing elements 50 and 60 on the force elongation curve which is shown in Figure 6.

[0088] 083] [Table 1] 84] It can be seen that the cables 50 and 60 according to the invention make it possible to obtain a very high breaking strength for a small footprint; they have a high elongation at break compared to that of the state of the art.

[0089]

[0085] The invention is not limited to the embodiments previously described.

[0086] For the method of manufacturing the reinforcing element, it is also possible to assemble the metal wire elements around the core by cabling to form a strand and then, in a second step, assemble the strands by cabling to form the reinforcing element.

Claims

CLAIMS 1. Reinforcing element (50), characterized in that it comprises several strands (T) arranged in a single-layer arrangement with each strand (T) consisting of: - a core consisting of a textile wire element (36) and; - a layer comprising at least two metallic wire elements (38) wound in a helix around the core; in which the diameter Df of each metallic wire element (38) ranges from 0.04 to 0.10 mm.

2. Reinforcing element (50) according to the preceding claim, in which the number of metallic wire elements (38) wound in a helix around the core (36) ranges from 5 to 12 and preferably from 7 to 9.

3. Reinforcing element (50) according to any one of the preceding claims, in which the number of strands (T) is chosen from 3 and 4.

4. Reinforcing element (50) according to any one of the preceding claims, in which the total elongation at break of the reinforcing element (50) At is greater than or equal to 4.00% determined by the ISO 6892-1 standard of October 2009.

5. Reinforcing element (50) according to any one of the preceding claims, in which each metal wire element (38) has a breaking strength, noted Rm, greater than or equal to 3,400 MPa and preferably greater than or equal to 4,000 MPa determined by the ISO 6892-1 standard of October 2009.

6. Reinforcing element (50) according to any one of the preceding claims, in which the diameter Df of each metallic wire element (38) ranges from 0.05 to 0.10 mm and preferably from 0.06 to 0.09 mm.

7. Reinforcing element (50) according to any one of the preceding claims, in which the diameter of each textile core wire element (36) ranges from 0.05 to 0.20 mm and preferably from 0.10 to 0.17 mm.

8. Reinforcing element (50) according to any one of the preceding claims, wherein the diameter of the reinforcing element (50) ranges from 0.10 to 0.90 mm and preferably from 0.50 to 0.70 mm.

9. Reinforcing element (50) according to any one of claims 1 to 8, in which the textile core (36) comprises a single multifilament wire element.

10. Reinforcing element (50) according to any one of claims 1 to 8, in which the textile core (36) comprises several multifilament wire elements.

11. Method for manufacturing a reinforcing element (50) characterized in that at least two metal wire elements (38) are assembled in a helix around a core consisting of a textile wire element (36) by twisting in one direction to form a strand (T) in which the diameter Df of each metal wire element (38) ranges from 0.04 to 0.10 mm, the assembly step is repeated to obtain at least two strands (T) and several strands are assembled in a helix (T) by twisting in the opposite direction to the step of assembling the strands (T) to form a reinforcing element (50).

12. Reinforced product (R) comprising a reinforcing element (50) according to any one of claims 1 to 10.

13. Tire comprising at least one reinforcing element (50) according to any one of claims 1 to 10 or a reinforced product (R) according to claim 12.

Images