Classifications

• • D—TEXTILES; PAPER
  • D07—ROPES; CABLES OTHER THAN ELECTRIC
  • D07B—ROPES OR CABLES IN GENERAL
  • D07B1/00—Constructional features of ropes or cables
  • D07B1/06—Ropes or cables built-up from metal wires, e.g. of section wires around a hemp core
  • D07B1/0606—Reinforcing cords for rubber or plastic articles
  • D07B1/062—Reinforcing cords for rubber or plastic articles the reinforcing cords being characterised by the strand configuration
• • D—TEXTILES; PAPER
  • D07—ROPES; CABLES OTHER THAN ELECTRIC
  • D07B—ROPES OR CABLES IN GENERAL
  • D07B1/00—Constructional features of ropes or cables
  • D07B1/06—Ropes or cables built-up from metal wires, e.g. of section wires around a hemp core
  • D07B1/0606—Reinforcing cords for rubber or plastic articles
  • D07B1/062—Reinforcing cords for rubber or plastic articles the reinforcing cords being characterised by the strand configuration
  • D07B1/0626—Reinforcing cords for rubber or plastic articles the reinforcing cords being characterised by the strand configuration the reinforcing cords consisting of three core wires or filaments and at least one layer of outer wires or filaments, i.e. a 3+N configuration
• • D—TEXTILES; PAPER
  • D07—ROPES; CABLES OTHER THAN ELECTRIC
  • D07B—ROPES OR CABLES IN GENERAL
  • D07B2201/00—Ropes or cables
  • D07B2201/20—Rope or cable components
  • D07B2201/2001—Wires or filaments
  • D07B2201/201—Wires or filaments characterised by a coating
  • D07B2201/2011—Wires or filaments characterised by a coating comprising metals
• • D—TEXTILES; PAPER
  • D07—ROPES; CABLES OTHER THAN ELECTRIC
  • D07B—ROPES OR CABLES IN GENERAL
  • D07B2201/00—Ropes or cables
  • D07B2201/20—Rope or cable components
  • D07B2201/2015—Strands
  • D07B2201/2023—Strands with core
• • D—TEXTILES; PAPER
  • D07—ROPES; CABLES OTHER THAN ELECTRIC
  • D07B—ROPES OR CABLES IN GENERAL
  • D07B2201/00—Ropes or cables
  • D07B2201/20—Rope or cable components
  • D07B2201/2015—Strands
  • D07B2201/2024—Strands twisted
  • D07B2201/2029—Open winding
• • D—TEXTILES; PAPER
  • D07—ROPES; CABLES OTHER THAN ELECTRIC
  • D07B—ROPES OR CABLES IN GENERAL
  • D07B2201/00—Ropes or cables
  • D07B2201/20—Rope or cable components
  • D07B2201/2015—Strands
  • D07B2201/2024—Strands twisted
  • D07B2201/2029—Open winding
  • D07B2201/2031—Different twist pitch
  • D07B2201/2032—Different twist pitch compared with the core
• • D—TEXTILES; PAPER
  • D07—ROPES; CABLES OTHER THAN ELECTRIC
  • D07B—ROPES OR CABLES IN GENERAL
  • D07B2201/00—Ropes or cables
  • D07B2201/20—Rope or cable components
  • D07B2201/2015—Strands
  • D07B2201/2038—Strands characterised by the number of wires or filaments
• • D—TEXTILES; PAPER
  • D07—ROPES; CABLES OTHER THAN ELECTRIC
  • D07B—ROPES OR CABLES IN GENERAL
  • D07B2201/00—Ropes or cables
  • D07B2201/20—Rope or cable components
  • D07B2201/2015—Strands
  • D07B2201/2046—Strands comprising fillers
• • D—TEXTILES; PAPER
  • D07—ROPES; CABLES OTHER THAN ELECTRIC
  • D07B—ROPES OR CABLES IN GENERAL
  • D07B2201/00—Ropes or cables
  • D07B2201/20—Rope or cable components
  • D07B2201/2047—Cores
  • D07B2201/2052—Cores characterised by their structure
  • D07B2201/2059—Cores characterised by their structure comprising wires
  • D07B2201/2061—Cores characterised by their structure comprising wires resulting in a twisted structure
• • D—TEXTILES; PAPER
  • D07—ROPES; CABLES OTHER THAN ELECTRIC
  • D07B—ROPES OR CABLES IN GENERAL
  • D07B2201/00—Ropes or cables
  • D07B2201/20—Rope or cable components
  • D07B2201/2047—Cores
  • D07B2201/2052—Cores characterised by their structure
  • D07B2201/2059—Cores characterised by their structure comprising wires
  • D07B2201/2062—Cores characterised by their structure comprising wires comprising fillers
• • D—TEXTILES; PAPER
  • D07—ROPES; CABLES OTHER THAN ELECTRIC
  • D07B—ROPES OR CABLES IN GENERAL
  • D07B2201/00—Ropes or cables
  • D07B2201/20—Rope or cable components
  • D07B2201/2047—Cores
  • D07B2201/2052—Cores characterised by their structure
  • D07B2201/2065—Cores characterised by their structure comprising a coating
• • D—TEXTILES; PAPER
  • D07—ROPES; CABLES OTHER THAN ELECTRIC
  • D07B—ROPES OR CABLES IN GENERAL
  • D07B2201/00—Ropes or cables
  • D07B2201/20—Rope or cable components
  • D07B2201/2071—Spacers
  • D07B2201/2074—Spacers in radial direction
• • D—TEXTILES; PAPER
  • D07—ROPES; CABLES OTHER THAN ELECTRIC
  • D07B—ROPES OR CABLES IN GENERAL
  • D07B2205/00—Rope or cable materials
  • D07B2205/30—Inorganic materials
  • D07B2205/3021—Metals
  • D07B2205/3071—Zinc (Zn)
• • D—TEXTILES; PAPER
  • D07—ROPES; CABLES OTHER THAN ELECTRIC
  • D07B—ROPES OR CABLES IN GENERAL
  • D07B2205/00—Rope or cable materials
  • D07B2205/30—Inorganic materials
  • D07B2205/3021—Metals
  • D07B2205/3085—Alloys, i.e. non ferrous
  • D07B2205/3089—Brass, i.e. copper (Cu) and zinc (Zn) alloys
• • D—TEXTILES; PAPER
  • D07—ROPES; CABLES OTHER THAN ELECTRIC
  • D07B—ROPES OR CABLES IN GENERAL
  • D07B2207/00—Rope or cable making machines
  • D07B2207/40—Machine components
  • D07B2207/4072—Means for mechanically reducing serpentining or mechanically killing of rope
• • D—TEXTILES; PAPER
  • D07—ROPES; CABLES OTHER THAN ELECTRIC
  • D07B—ROPES OR CABLES IN GENERAL
  • D07B2401/00—Aspects related to the problem to be solved or advantage
  • D07B2401/20—Aspects related to the problem to be solved or advantage related to ropes or cables
  • D07B2401/2015—Killing or avoiding twist
• • D—TEXTILES; PAPER
  • D07—ROPES; CABLES OTHER THAN ELECTRIC
  • D07B—ROPES OR CABLES IN GENERAL
  • D07B2401/00—Aspects related to the problem to be solved or advantage
  • D07B2401/20—Aspects related to the problem to be solved or advantage related to ropes or cables
  • D07B2401/208—Enabling filler penetration
• • D—TEXTILES; PAPER
  • D07—ROPES; CABLES OTHER THAN ELECTRIC
  • D07B—ROPES OR CABLES IN GENERAL
  • D07B2501/00—Application field
  • D07B2501/20—Application field related to ropes or cables
  • D07B2501/2046—Tyre cords
• • D—TEXTILES; PAPER
  • D07—ROPES; CABLES OTHER THAN ELECTRIC
  • D07B—ROPES OR CABLES IN GENERAL
  • D07B5/00—Making ropes or cables from special materials or of particular form
  • D07B5/12—Making ropes or cables from special materials or of particular form of low twist or low tension by processes comprising setting or straightening treatments
• • D—TEXTILES; PAPER
  • D07—ROPES; CABLES OTHER THAN ELECTRIC
  • D07B—ROPES OR CABLES IN GENERAL
  • D07B7/00—Details of, or auxiliary devices incorporated in, rope- or cable-making machines; Auxiliary apparatus associated with such machines
  • D07B7/02—Machine details; Auxiliary devices
  • D07B7/14—Machine details; Auxiliary devices for coating or wrapping ropes, cables, or component strands thereof
  • D07B7/145—Coating or filling-up interstices

Definitions

• the invention relates to metal cables which can be used in particular for reinforcing tires, particularly tires intended to equip vehicles carrying heavy loads and traveling at sustained speed, such as, for example, trucks, tractors, trailers or buses trucks, planes ...
• a tire of the heavy-duty type with a radial carcass reinforcement comprises a tread, two inextensible beads, two sidewalls connecting the beads to the tread and a belt, or crown reinforcement, disposed circumferentially between the reinforcement carcass and tread.
• This vertex reinforcement includes several reinforcements with different functions.
• the crown frame generally comprises a working frame comprising two working plies, or crossed plies, comprising wire working metal reinforcing elements arranged substantially parallel to each other in each working ply, but crossed by one ply to the other, that is to say inclined, symmetrically or not, with respect to the median circumferential plane, by an angle generally ranging from 15 ° to 40 °.
• This working reinforcement allows, among other functions, the at least partial transmission of the transverse forces exerted by the ground on the tire during the rolling of the latter in order to ensure the directionality of the tire, that is to say the capacity of the tire. tire to allow the vehicle on which it is mounted to turn.
• the third requirement is particularly strong for tire casings for industrial vehicles such as heavy goods vehicles, designed to be able to be retreaded one or more times when the treads which they comprise reach a critical degree of wear afterwards. prolonged taxiing.
• layered steel cables consisting of a central core and one or more layers of concentric son arranged around this core.
• the most used layered cables are essentially cables of M + N or M + N + P construction, formed of a core of M wire (s) surrounded by at least one layer of N wires possibly itself surrounded by an outer layer of P wires, the M, N or even P wires generally having the same diameter for reasons of simplification and cost.
• the two-layer cables most used today in tire belts are essentially 3 + N construction cables made up of a core or internal layer of 3 internal metal wires. and an outer layer of N outer metal wires helically wound around the inner layer of the cable (eg 8 or 9 outer metal wires).
• the outer layer is relatively desaturated thanks to the large diameter of the inner layer provided by the presence of the three core threads, all the more so when the diameter of the core threads is chosen to be greater than that of the threads of the outer layer.
• This type of construction promotes, as we know, the external penetrability of the cable by the calendering rubber of the tire or other rubber article during the curing of the latter, and consequently makes it possible to improve endurance. cables in fatigue and fatigue-corrosion, particularly vis-à-vis the problem of cleavage described above.
• the construction cables (M> 1) + N however have the drawback that they are not penetrable to the core because of the presence of a channel or capillary in the center of the N core wires, which remains empty after impregnation with the rubber and therefore conducive, by a sort of "wicking" effect, to the propagation of corrosive media such as water.
• This drawback of M + N construction cables is well known, it has been explained for example in patent applications WO 01/00922, WO 01/49926, WO 2005/071157, WO 2006/013077.
• the aim of the invention is a cable with improved efficiency solving the problems mentioned above.
• the invention relates to a two-layer cable, comprising:
• the cable is obtained by a process comprising a manufacturing step of the sheathed inner layer in which the inner layer is surrounded with an elastomeric composition having a thickness G then N external metal wires to form the external layer, with N being strictly greater than Nmax which is the maximum number of external metal wires that can be placed on the theoretical external layer obtained when the internal layer is directly in contact with the theoretical outer layer.
• 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 (that is to say limits a and b excluded) while any interval of values designated by the expression “from a to b” signifies the range of values going from the limit “a” to the limit “b”, that is to say including the strict limits “a” and “b ".
• the cable has two layers of son, that is to say it comprises an assembly consisting of two layers of son, no more and no less, that is to say that the assembly has two layers of wires, not one, not three, but only two.
• the inner layer of the cable is surrounded by an elastomeric composition having a thickness G and then it is surrounded by an outer layer.
• elastomer composition or elastomeric composition is meant that the composition comprises at least one elastomer or one rubber (the two terms being synonymous) and at least one other component.
• Nmax The maximum number of outer wires having a diameter d3 which can be placed on the theoretical outer layer having a helix radius Rt and a helix angle at obtained when the inner layer is directly in contact with the theoretical outer layer, hereinafter referred to as Nmax is defined by the following formula:
• Nmax E (TÎ / arctan [(d3 / 2) 2 / ((Rt 2 - (d3 / 2) 2 ) x cos 2 at))] 1/2 ) with, by definition, E is the integer value of the formula in parenthesis, the helix radius Rt of the theoretical outer layer of the cable is the radius of the theoretical circle passing through the centers of the outer wires of the theoretical outer layer in a plane perpendicular to the axis of the cable.
• the cable according to the invention has N> Nmax wires thus making it possible to increase the breaking force of the cable by adding at least minus one extra thread.
• the inventors behind the invention put forward the hypothesis that the presence of the sheath makes it possible, on the one hand, to create a sufficient arch around the internal layer making it possible to add an additional thread and, on the other hand, to relieve the contact pressures by a cushion effect between the inner layer and the outer layer thereby improving the performance of each of the son of the cable.
• the pitch of a wire represents the length of this wire, measured parallel to the axis of the cable in which it is located, at the end of which the wire having this pitch makes one turn. complete around said axis of the wire.
• the direction of winding of a layer of wires is understood to mean the direction formed by the wires relative to the axis of the cable.
• the direction of winding is commonly designated by the letter either Z or S.
• the cable is metallic.
• metallic cable is understood to mean by definition a cable formed of wires consisting mainly (that is to say for more than 50% of these wires) or entirely (for 100% of the wires) of a metallic material.
• Such a metallic cable is preferably implemented with a steel cable, more preferably made of pearlitic (or ferrito-pearlitic) carbon steel hereinafter referred to as "carbon steel”, or even stainless steel (by definition, steel comprising at least 11% chromium and at least 50% iron). But it is of course possible to use other steels or other alloys.
• its carbon content (% by weight of steel) is preferably between 0.05% and 1.2%, in particular between 0.4% and 1.1. %; these contents represent a good compromise between the mechanical properties required for the tire and the feasibility of the cords.
• the metal or steel used can itself be coated with a metal layer improving, for example, the setting properties.
• a metal layer improving, for example, the setting properties.
• the steel used is covered with a layer of brass (Zn-Cu alloy) or of zinc.
• the wires of the same layer all have substantially the same diameter.
• the outer cords all have substantially the same diameter.
• substantially the same diameter is meant that the wires have the same diameter within industrial tolerances.
• the outer threads are wound helically around the inner thread at a pitch ranging from 10 to 30 mm.
• the threads do not undergo preformation.
• the outer layer comprises a relatively high number of outer threads and therefore exhibits a relatively high breaking strength.
• the ratio of the diameter d1 of the or each internal metal wire to the diameter d3 of each external metal wire ranges from 0.9 to 1.2.
• the diameter d1 of the or each internal metal wire is equal to the diameter d3 of each external metal wire.
• the same diameter is preferably used for the internal metal wire (s) and for the external metal wires, which limits the number of different diameters to be managed during the manufacture of the cable.
• the outer layer of the cable is saturated so that the inter-wire distance of the outer metal wires is strictly less than 20 ⁇ m.
• a saturated cable layer is such that the inter-wire distance of the outer metal wires is strictly less than 20 ⁇ m.
• the inter-wire distance of the outer layer of outer wires is defined, on a section of the cable perpendicular to the main axis of the cable, as the shortest distance that separates, on average, two metallic wires external adjacent.
• the inter-wire distance of the outer metal wires is less than or equal to 100 ⁇ m.
• a desaturated cable layer is such that the inter-wire distance of the outer metal wires is greater than or equal to 20 ⁇ m.
• the thickness G of the sheath of elastomeric composition is strictly greater than 10 ⁇ m, preferably greater than or equal to 12 ⁇ m and more preferably greater than or equal to 15 ⁇ m.
• the thickness G of the sheath of elastomeric composition is less than or equal to 300 ⁇ m, preferably less than or equal to 250 ⁇ m and more preferably less than or equal to 230 ⁇ m. This thickness makes it possible to optimize the relatively high number of external metal wires and therefore to have a relatively high breaking force while limiting the external diameter of the cable.
• the elastomeric composition comprises an elastomer chosen from the group consisting of polybutadienes, natural rubber, synthetic polyisoprenes, butadiene copolymers, isoprene copolymers, and mixtures of these elastomers.
• the elastomeric composition comprises an elastomer chosen from the group consisting of natural rubber, synthetic polyisoprenes, isoprene copolymers, and mixtures of these elastomers.
• the elastomer composition also comprises a vulcanization system, a filler. More preferably, the elastomer is diene.
• the elastomeric composition comprises carbon black as reinforcing filler.
• the most severe transverse forces exerted in the cable when the latter is placed in tension are the transverse forces exerted between internal metal wires.
• cables having an architecture in which M> 1 and comprising a number of external metal wires such that the external layer of the cable is saturated so as to maximize the breaking force by adding a maximum number of external metal wires.
• M> 1 the cable according to the invention having an architecture in which M> 1, thanks to the formation of a cushion of elastomer composition at least partially absorbing the transverse forces exerted between the internal metal wires, the cable exhibits a markedly improved breaking strength.
• each metal wire respectively has a diameter d 1, d3 ranging from 0.22 mm to 0.60 mm and preferably from 0.22 mm to 0.50 mm.
• the transverse forces exerted between the internal metal wires are absorbed by the sheath and the cable has an improved breaking force due to the presence of an external metal wire. additional while limiting its external diameter.
• Another object of the invention is a reinforced product comprising an elastomeric matrix and at least one cable as defined above.
• the reinforced product comprises one or more cables according to the invention embedded in the elastomeric matrix, and in the case of several cables, the cables are arranged side by side in a main direction.
• Another object of the invention is a tire comprising at least one cable or a reinforced product as defined above.
• the tire comprises a carcass reinforcement anchored in two beads and surmounted radially by a crown reinforcement itself surmounted by a tread, the crown reinforcement being joined to said beads by two sidewalls and comprising at least one cable as defined above.
• the crown frame comprises a protective frame and a working frame, the working frame comprising at least one cable as defined above, the protective frame being radially interposed between the tread and the working reinforcement.
• the cable is particularly intended for industrial vehicles chosen from heavy vehicles such as "Heavy goods” - ie, metro, bus, road transport vehicles (trucks, tractors, trailers), off-road vehicles - , agricultural or civil engineering machinery, other transport or handling vehicles.
• heavy vehicles such as "Heavy goods” - ie, metro, bus, road transport vehicles (trucks, tractors, trailers), off-road vehicles - , agricultural or civil engineering machinery, other transport or handling vehicles.
• the tire is for a heavy vehicle type vehicle.
• FIG. 1 is a sectional view perpendicular to the circumferential direction of a tire according to the invention
• FIG. 2 is a sectional view of a reinforced product according to the invention.
• FIG. 3 is a schematic sectional view perpendicular to the cable axis (assumed rectilinear and at rest) of a cable (50) according to a first embodiment of the invention
• FIG. 4 is a view similar to that of Figure 3 of a cable (50 ’) according to a second embodiment of the invention
• FIG. 5 is a view similar to that of Figure 3 of a cable (50 ") according to a third embodiment of the invention.
• FIG. 1 there is shown a reference X, Y, Z corresponding to the usual respectively axial (X), radial (Y) and circumferential (Z) orientations of a tire.
• the “median circumferential plane” M of the tire is the plane which is normal to the axis of rotation of the tire and which is located equidistant from the annular reinforcing structures of each bead.
• the tire 10 is for a heavy-duty vehicle.
• the tire 10 has a dimension of the 315/80 R 22.5 type.
• This tire 10 comprises a crown 2 reinforced by a crown reinforcement or belt 6, two sidewalls 3 and two beads 4, each of these beads 4 being reinforced with a bead wire 5.
• the crown 2 is surmounted by a strip of bearing not shown in this schematic figure.
• a carcass reinforcement 7 is wound around the two bead wires 5 in each bead 4, the upturn 8 of this reinforcement 7 being for example disposed towards the outside of the tire 10 which is shown here mounted on its rim 9.
• the carcass reinforcement 7 is in a manner known per se consisting of at least one ply reinforced by so-called "radial" cables, that is to say that these cables are arranged practically parallel to each other and extend from one bead to the other.
• the tire according to the invention is characterized in that its belt 6 comprises at least, as reinforcement of at least one of the belt plies, a two-layer metal cable according to the invention.
• this belt 6 it will be understood that the cables of the invention can for example reinforce all or part of the so-called working belt plies.
• this tire 10 also comprises, in a known manner, an inner layer of rubber or elastomer (commonly called “inner rubber") which defines the radially internal face of the tire and which is intended to protect the ply from casing of the air diffusion coming from the space inside the tire.
• FIG. 2 EXAMPLE OF A REINFORCED PRODUCT ACCORDING TO THE INVENTION
• the reinforced product 100 comprises at least one cable 50, in the species several cables 50, embedded in the elastomeric matrix 102.
• the reinforced product 100 comprises several cables 50 arranged side by side in the main direction X and extending parallel to each other within the reinforced product 100 and collectively embedded in the elastomeric matrix 102.
• the cable 50 is metallic and has two layers. Thus, it is understood that the layers of metal son constituting the cable 50 are two in number, no more, no less.
• the cable 50 comprises an internal layer C1 of the cable consisting of M> 1 internal metal wires F1.
• the internal layer C1 is surrounded by an elastomeric composition having a thickness G then forming the internal sheathed layer CIG.
• the outer layer C3 consists of N> Nmax outer metal wires F3 wound around the internal sheathed layer CIG of the cable.
• Each internal metal wire F1 and each external metal wire F3 respectively has a diameter d1 and d3.
• the outer layer C3 of the cable is saturated.
• the inter-wire distance of the outer wires is strictly less than 20 ⁇ m and here is equal to 0 ⁇ m.
• Each wire has a tensile strength, denoted Rm, such that 2500 ⁇ Rm ⁇ 3100 MPa.
• the steel of these wires is said to be of SHT (“Super High Tensile”) grade.
• Other yarns can be used, for example lower grade yarns, for example of grade NT ("Normal Tensile") or HT ("High Tensile”), such as higher grade yarns, for example of UT grade (" Ultra Tensile ”) or MT (“ Mega Tensile ”).
• the cable according to the invention is manufactured using a process comprising steps well known to those skilled in the art.
• the cable described above is manufactured according to known processes comprising the following steps, preferably carried out online and continuously:
• the internal layer C1 is surrounded with an elastomeric composition having a thickness G then the N external metal wires F3 are assembled by twisting around the internal layer CIG at the pitch p3 and in the S direction to form the assembly of the CIG and C3 layers, with N being strictly greater than Nmax which is the maximum number of external metal wires F3 that can be placed on the theoretical external layer C3T obtained when the internal layer C1 is directly in contact with the theoretical outer layer C3T;
• torsional balancing is understood here to mean, in a manner well known to those skilled in the art, the cancellation of the residual torsional torques (or of the elastic torsional return) exerted on each wire, in the layer. intermediate as in the outer layer.
• the thickness G of the sheath of elastomeric composition is strictly greater than 10 ⁇ m, preferably greater than or equal to 12 ⁇ m and more preferably greater than or equal to 15 ⁇ m and the thickness G is less than or equal to 300 ⁇ m, preferably less than or equal to 250 ⁇ m and more preferably less than or equal to 230 ⁇ m.
• G 71 ⁇ m.
• the elastomeric composition comprises a vulcanization system, a filler and a diene elastomer.
• elastomeric composition use is made of a composition of diene elastomer (s) conventional for tires, based on natural rubber (peptized) and carbon black N330 (65 phr), further comprising the usual additives.
• the hoop F is wound at the pitch pf in the Z direction around the assembly obtained previously.
• the cord is then incorporated by calendering into composite fabrics formed from a known composition based on natural rubber and carbon black as reinforcing filler, conventionally used for the manufacture of crown reinforcements for radial tires.
• This composition essentially comprises, in addition to the elastomer and the reinforcing filler (carbon black), an antioxidant, stearic acid, an extender oil, cobalt naphthenate as an adhesion promoter, finally a vulcanization system (sulfur, accelerator, ZnO).
• the composite fabrics reinforced by these cables comprise a matrix of elastomeric composition formed of two thin layers of elastomeric composition which are superimposed on either side of the cables and which respectively have a thickness ranging from 0.6 and 1.5. mm.
• the calendering pitch (laying of cables in the fabric of elastomeric composition) ranges from 1 mm to 4 mm.
• FIG. 4 shows a cable 50 ’according to a second embodiment of the invention. Elements similar to the first embodiment are designated by identical references.
• FIG. 5 shows a cable 50 ”according to a third embodiment of the invention. Elements similar to the first embodiment are designated by identical references.
• Table 1 summarizes the characteristics for the different cables 50, 50 'and 50 ".
• Table 5 summarizes the characteristics of the indicator cable T1, of comparative cables C1 and C2 not in accordance with the invention.
• Table 5 the indicator cable T1, the comparative cables C1 and C2 and the cable 50 ′ according to the invention. The results of these tests are given in base 100. Thus, a result greater than 100 for one or other of these tests means that the cable tested has a breaking force greater than the control cable. In the same table, we also compared the breaking force related to the diameter of the cable.
• the cable 50 ’ according to the invention has a breaking force of the same order as that of the comparative cable C2 and better compared to the control cable T1 and the comparative cable C1.
• the breaking force reduced to the diameter of the cable is significantly greater than that of the control cable T1 and that of the comparative cables C1 and C2 with improved penetrability.
• the cable according to the invention has a better arrangement of the wires in the same space. This test clearly demonstrates that the presence here of the sheath of elastomeric composition making it possible to put two additional threads on the outer layer in accordance with the invention makes it possible to obtain an arching effect and thus a more effective participation of each thread in the breaking force. of the cable compared to the T1 cable and thus solve the problems mentioned in the preamble.

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• 2019
  • 2019-11-15 FR FR1912766A patent/FR3103200A1/fr not_active Withdrawn
• 2020
  • 2020-11-05 EP EP20819811.9A patent/EP4058629B1/de active Active
  • 2020-11-05 WO PCT/FR2020/051995 patent/WO2021094674A1/fr not_active Ceased
  • 2020-11-05 AU AU2020382109A patent/AU2020382109A1/en active Pending

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