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
  • D07B1/0613—Reinforcing cords for rubber or plastic articles the reinforcing cords being characterised by the rope configuration
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
  • B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
  • B60C9/0007—Reinforcements made of metallic elements, e.g. cords, yarns, filaments or fibres made from metal
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
  • B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
  • B60C2009/0071—Reinforcements or ply arrangement of pneumatic tyres characterised by special physical properties of the reinforcements
  • B60C2009/0092—Twist structure
• • 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
  • D07B1/0633—Reinforcing cords for rubber or plastic articles the reinforcing cords being characterised by the strand configuration having a multiple-layer configuration
• • D—TEXTILES; PAPER
  • D07—ROPES; CABLES OTHER THAN ELECTRIC
  • D07B—ROPES OR CABLES IN GENERAL
  • D07B2201/00—Ropes or cables
  • D07B2201/10—Rope or cable structures
  • D07B2201/104—Rope or cable structures twisted
  • D07B2201/1048—Rope or cable structures twisted using regular lay, i.e. the wires or filaments being parallel to rope axis
• • D—TEXTILES; PAPER
  • D07—ROPES; CABLES OTHER THAN ELECTRIC
  • D07B—ROPES OR CABLES IN GENERAL
  • D07B2201/00—Ropes or cables
  • D07B2201/10—Rope or cable structures
  • D07B2201/104—Rope or cable structures twisted
  • D07B2201/1064—Rope or cable structures twisted characterised by lay direction of the strand compared to the lay direction of the wires in the strand
• • D—TEXTILES; PAPER
  • D07—ROPES; CABLES OTHER THAN ELECTRIC
  • D07B—ROPES OR CABLES IN GENERAL
  • D07B2201/00—Ropes or cables
  • D07B2201/10—Rope or cable structures
  • D07B2201/104—Rope or cable structures twisted
  • D07B2201/1076—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
  • D07B2201/2001—Wires or filaments
  • D07B2201/2006—Wires or filaments characterised by a value or range of the dimension given
• • 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
  • D07B2201/202—Strands characterised by a value or range of the dimension given
• • 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
  • D07B2201/2025—Strands twisted characterised by a value or range of the pitch parameter given
• • 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
  • D07B2201/203—Cylinder winding, i.e. S/Z or Z/S
• • 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
• • 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
  • D07B2201/2051—Cores characterised by a value or range of the dimension given
• • 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
• • 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
  • 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

Definitions

• the invention relates to multi-strand cables used in particular for the reinforcement of tires, particularly tires for heavy industrial vehicles.
• a radial carcass reinforcement tire comprises a tread, two inextensible beads, two flanks connecting the beads to the tread and a belt, or crown reinforcement, arranged circumferentially between the carcass reinforcement and the band. rolling.
• This crown reinforcement comprises several layers of elastomeric composition, possibly reinforced by reinforcing elements such as cables or monofilaments, of metal or textile type.
• the crown reinforcement generally comprises at least two superimposed vertex plies, sometimes called working plies or crossed plies, whose reinforcing elements, generally metallic, are arranged substantially parallel to each other inside the plywood. a web, but crossed from one web to another, that is to say inclined, symmetrically or otherwise, with respect to the median circumferential plane, an angle which is generally between 10 ° and 45 °.
• the working plies generally comprise reinforcement elements having a very low elongation so as to ensure their function of guiding the tire.
• the crown reinforcement may also comprise various other layers or layers of auxiliary elastomeric composition, of variable widths depending on the case, with or without reinforcing elements.
• protection plies responsible for protecting the rest of the belt from external aggressions, perforations, or so-called shrinking plies comprising reinforcing elements oriented substantially in the circumferential direction (zero-plies). degree), whether radially external or internal to the working plies.
• the protective plies generally comprise reinforcing elements having a high elongation so as to be deformed under the effect of a stress exerted by an indenter, for example a rock.
• This cable comprises an inner layer of the cable consisting of an inner strand and an outer layer of the cable consisting of six outer strands wound helically around the inner layer of the cable.
• Each inner and outer strand comprises an inner layer of the strand consisting of a single inner wire, an intermediate layer consisting of six son and an outer layer of the strand consisting of eleven external son.
• the intermediate and outer layers of the inner strand are wound in the S direction around the inner layers and intermediate of the inner strand.
• the intermediate and outer layers of each outer strand are wound in the Z-direction around the inner and outer layers of each outer strand respectively.
• the outer strands are wound helically around the inner strand in a winding direction of the cable, the latter being the direction S.
• Each pitch p2, p2 'of the intermediate layers of each inner and outer strand is equal to 14 mm and each not p3, p3 'of the outer layer of each inner and outer strand is equal to 20 mm.
• a solution to increase the life of the tire is to fight against the spread of these corrosive agents. It is thus possible to cover each inner and intermediate layer of an elastomeric composition during the manufacture of the cable. During this process, the elastomeric composition penetrates into the capillaries present between each layer of each strand and thus prevents the propagation of corrosive agents.
• Such cables generally called cables gummed in situ, are well known in the state of the art.
• Another solution to increase the life of the tire is to increase the breaking strength of the cable.
• the breaking force is increased by increasing the diameter of the wires constituting the cable and / or the number of wires and / or the unit resistance of each wire.
• further increase the diameter of the son for example beyond 0.50 mm, necessarily leads to a decrease in the flexibility of the cable which is not desirable.
• Increasing the number of yarns causes most of the time a decrease in the penetrability of the strands by the elastomer composition.
• increasing the unit resistance of each wire requires significant investment in wire manufacturing facilities.
• the invention aims a cable having improved penetrability of its outer strands and a better accessibility of the inner strand by the elastomer composition with respect to the cable of the state of the art thus reducing the input and the propagation of corrosive agents in and along the cable.
• the subject of the invention is a two-layer multi-strand cable comprising: an inner layer of the cable consisting of an internal strand with at least two layers, comprising:
• An inner layer consisting of internal wire (s), and
• An outer layer consisting of N external wires wound around the inner layer,
• an outer layer of the cable consisting of L> 1 external three-layer strands comprising:
• An intermediate layer consisting of M 'intermediate threads wrapped around the inner layer with a pitch p2', and
• the outer layer of the cable is wound around the inner layer of the cable in a winding direction of the cable;
• each outer layer of each inner and outer strand is respectively wound around the inner and intermediate layer respectively of each inner and outer strand in the same winding direction opposite to the winding direction of the cable;
• the outer layer of the cable is desaturated
• the steps p2 'and p3' satisfy 0.36 ⁇ ( ⁇ 3'- ⁇ 2 ') / ⁇ 3' ⁇ 0.57.
• the pitch of a strand represents the length of this strand, measured parallel to the axis of the cable, at the end of which the strand having this pitch performs a complete revolution about said axis of the strand. cable.
• 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 performs a complete revolution around said axis of the strand.
• the winding direction of a layer of strands or son means the direction formed by the strands or son relative to the axis of the cable or strand.
• the winding direction is commonly referred to by the letter Z or S.
• Steps, winding directions and diameters of the strands and strands are determined in accordance with ASTM D2969-04 of 2014.
• a desaturated strand layer is such that there is sufficient space between the strands so as to allow the passage of an elastomer composition.
• the outer layer of strands is desaturated which means that the outer strands do not touch each other and that there is sufficient space between two adjacent outer strands allowing the passage of an elastomer composition 'to the inner strand.
• the inter-strand distance of the layer external outer strand defined, on a section of the cable perpendicular to the main axis of the cable, as the shortest distance which separates, on average, the circular envelopes in which are inscribed two adjacent outer strands, is non-zero.
• the inter-strand distance outer layer of outer strands is greater than or equal to 30 microns, more preferably greater than or equal to 40 microns and even more preferably greater than or equal to 50 microns.
• the inter-strand distance of the external layer of outer strands is greater than or equal to 70 ⁇ m, preferably greater than or equal to 100 ⁇ m, more preferably greater than or equal to 150 ⁇ m and even more preferably higher or equal to 200 ⁇ m.
• the inner strand may be, in certain embodiments, two-layered, that is to say that it comprises only two layers but does not include two layers. only one, not three; and that in other embodiments, the inner strand may be three-layered, i.e., it comprises only three layers but does not include only two or four layers.
• the cable has two layers of strands, that is to say it comprises an assembly consisting of two layers of strands, neither more nor less, that is to say that the assembly has two layers of strands, not one, not three, but only two.
• the outer layer of the cable is wrapped around the inner layer of the cable in contact with the inner layer of the cable.
• the cable according to the invention has improved penetrability compared to a cable whose ratio ( ⁇ 3'- ⁇ 2 ') / ⁇ 3' is outside the range of reports according to the invention, such as cable examples of WO2015 / 090920 for which the ratio ( ⁇ 3'- ⁇ 2 ') / ⁇ 3' is equal to 0.30 and whose penetrability can be improved by means of the invention.
• the inventors at the origin of the invention hypothesize that this ratio makes it possible to obtain radial passage windows for the relatively large elastomer composition within each outer strand.
• the radial passage windows are defined as the intersection between the projected space on a plane parallel to the main axis of the cable between two adjacent wires of the outer layer of an outer strand and secondly the space projected on a plane parallel to the main axis of the cable between two adjacent wires of the intermediate layer of this outer strand. Such a radial passage window is illustrated in FIG.
• the cable according to the invention has spaces between the outer strands for the passage of the elastomer composition.
• cables having a relatively high breaking force are known because of the saturation of the outer layer of the cable (the outer strands are in pairs in contact with each other) which then forms a vault taking up the tensile forces exerted on the cable.
• the vault around the inner strand is broken, the high penetrability of the outer strands made possible by the ratio ( ⁇ 3'- ⁇ 2 ') / ⁇ 3' and the desaturation of the outer layer of the
• the cable allows the elastomer composition to penetrate, on the one hand, between the outer strands and, on the other hand, between the outer strands and the inner strand.
• this feature allows the elastomer composition to infiltrate between the outer layers of the inner and outer strands so as to create an elastomeric composition mattress at least partially absorbing the radial component of the force between the inner strands. and external.
• the winding direction of the cable opposite the winding direction of each outer layer of each inner and outer strand allows better penetrability of the cable, especially between the outer strands.
• the inventors theorize that, thanks to these winding directions, the external wires of the outer strands intersect the outer wires of the inner strand by forming a relatively point-like contact zone, unlike the cables of the examples of WO2015 / 090920 in which the direction of The winding of the cable is identical to the winding directions of the outer layers of each inner and outer strand and in which the outer wires of the outer strands intersect the outer wires of the inner strand forming a less punctual and more linear contact area, preventing the passing from the elastomer composition to the inner strand.
• each outer strand is cylindrical layers.
• the inner strand has cylindrical layers that this inner strand is two or three layers. It is recalled that such cylindrical layers are obtained when the different layers of a strand are wound at different pitch and / or when the winding directions of these layers are distinct from one layer to another.
• a strand with cylindrical layers is very strongly penetrable unlike a compact strand strand in which the pitch of all layers are equal and the winding directions of all layers are identical and has a much lower penetrability.
• the cable is devoid of any polymeric composition, in particular the cable is devoid of sheath of any polymeric composition covering the inner strand.
• the cable is devoid of any elastomeric composition, in particular the cable is devoid of sheath of any elastomeric composition covering the inner strand.
• the cable is metallic.
• Wire rope is defined as a wire made up of predominantly wires (ie more than 50% of these wires) or wholly (for 100% of the wires) of a metallic material.
• Such a wire rope is preferably implemented with a steel cable, more preferably carbonaceous pearlitic (or ferrito-pearlitic) steel, hereinafter referred to as "carbon steel", or else 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 0.4% and 1.2%, especially between 0.5% and 1.1%. % these levels represent a good compromise between the mechanical properties required for the tire and the feasibility of the wires.
• the metal or steel used may 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 zinc.
• the son of the same layer of a predetermined strand all have substantially the same diameter.
• the outer strands all have substantially the same diameter.
• substantially the same diameter is meant that the son or strands have the same diameter with close industrial tolerances.
• each wire of each strand has a diameter ranging from 0.15 mm to 0.60 mm, preferably from 0.20 mm to 0.50 mm, more preferably from 0.25 mm to 0.45 mm. and still more preferably from 0.28 mm to 0.42 mm.
• polymer composition or polymeric composition it is meant that the composition comprises at least one polymer.
• a polymer may be a thermoplastic, for example a polyester or a polyamide, a thermosetting polymer, an elastomer, for example natural rubber, a thermoplastic elastomer or a mixture of these polymers.
• elastomer composition or elastomeric composition is meant that the composition comprises at least one elastomer or a rubber (both terms being synonymous) and at least one other component.
• the elastomer composition also comprises a vulcanization system, a filler. More preferably, the elastomer is diene.
• the outer strands are wound helically around the inner strand in a pitch ranging from 40 mm to 100 mm and preferably from 50 mm to 90 mm.
• the steps ⁇ 2 'and ⁇ 3' satisfy the relation 0.38 ⁇ ( ⁇ 3'- ⁇ 2 ') / ⁇ 3', preferably 0.40 ⁇ ( ⁇ 3'- ⁇ 2 ') / ⁇ 3', more preferably 0 , 43 ⁇ ( ⁇ 3'- ⁇ 2 ') / ⁇ 3' and even more preferentially 0.45 ⁇ ( ⁇ 3'- ⁇ 2 ') / ⁇ 3'.
• This mechanical strength makes it possible to prevent, on the one hand, during the manufacture of the cable, all the threads of the intermediate layer from gathering together in contact with each other under the effect of the mechanical forces exerted by the tools of assembly and, secondly, that during the manufacture of a sheet comprising the cable or tire comprising the cable, all the son of the intermediate layer are all in contact with each other under the effect of pressure of the elastomer composition penetrating the cable.
• the steps p2 'and p3' satisfy the relationship ( ⁇ 3'- ⁇ 2 ') / ⁇ 3' ⁇ 0.55 and preferably ( ⁇ 3'- ⁇ 2 ') / ⁇ 3' ⁇ 0.53.
• the size of the radial passage windows of the elastomer composition is maximum and makes it possible to optimize the penetrability of each outer strand.
• the pitch p2 ' is such that 8 mm ⁇ p2' ⁇ 16 mm, preferably 8 mm ⁇ p2 ' ⁇ 14 mm and more preferably 8 mm ⁇ p2' ⁇ 12 mm.
• the pitch p3 ' is such that 10 mm ⁇ p3' ⁇ 40 mm, preferably 15 mm ⁇ p3 ' ⁇ 35 mm, more preferably 15 mm ⁇ p3' ⁇ 25 mm and even more preferably 17 mm ⁇ p3 ' ⁇ 23 mm.
• Steps p2 'and p3' in these preferred ranges make it possible to obtain a cable having mechanical properties compatible with pneumatic use, a cost and a relatively low linear density of the cable.
• the diameter of a strand is the diameter of the smallest circle in which the strand is circumscribed.
• the internal strand T1 has a diameter D1 and each outer strand TE has a diameter DE.
• each inner wire of the inner strand has a diameter d1 greater than or equal to the diameter dV of each inner wire of each outer strand, preferably each inner wire of the inner strand has a diameter d1 equal to the diameter dV of each inner wire of each outer strand.
• the same wire diameter is used on the inner layers of each inner and outer strand which limits the number of different wires to be managed during the manufacture of the cable.
• each inner wire of the inner strand has a diameter d1 greater than or equal to the diameter d2 'of each intermediate wire of each outer strand, preferably each inner wire of the inner strand has a diameter d1 greater than the diameter d2' of each intermediate wire of each outer strand.
• each inner wire of the inner strand has a diameter d1 greater than or equal to the diameter d3 'of each outer wire of each outer strand, preferably each inner wire of the inner strand has a diameter d1 greater than the diameter d3' of each outer thread of each outer strand.
• each outer wire of the inner strand has a diameter d3 greater than or equal to the diameter d3 'of each outer wire of each outer strand, preferably each outer wire of the inner strand has a diameter d3 greater than the diameter d3' of each outer thread of each outer strand.
• each outer wire of the inner strand can support the radial component of the force exerted by the outer strands on the inner strand during the pulling of the cable.
• This characteristic d3> d3 ' makes it possible to restore or even improve the breaking strength of the cable with respect to a cable comprising a vault formed by the outer strands or with respect to a cable in which d3 d d3'.
• the outer layer of the cable is incompletely unsaturated.
• An incompletely unsaturated layer of strands is such that there is not enough room in this layer to add at least one (X + 1) th strand of the same diameter as the X strands of the layer.
• the sum SIE of the intertoron distances E of the outer layer of the cable is such that SIE ⁇ DE.
• the sum SIE is the sum of the interton distances E separating each pair of adjacent strands of the layer.
• the distance intertorons of a layer is defined, on a section of the cable perpendicular to the main axis of the cable, as the shortest distance separating, on average, two adjacent strands of the layer.
• the interton distance E is calculated by dividing the sum SIE by the number of spaces separating the strands of the layer.
• the sum SI2 'of the interlayer distances of the intermediate layer of each outer strand is such that SI2' ⁇ d3 'with d3' being the diameter of each outer wire of each outer strand, preferably SI2 ' ⁇ 0, 8 x d3 '.
• the sum SI2 ' is the sum of the interfering distances separating each pair of adjacent wires from the layer.
• the interleaf distance of a layer 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 adjacent wires of the layer.
• the interfering distance is calculated by dividing the sum SI2 'by the number of spaces separating the wires of the layer.
• the diameter d3 'external son of the outer layer of each outer strand being preferably greater than the sum SI2', prevents the outer son from entering the intermediate layer. This ensures good architectural stability, which reduces the risk of changing the radial passage windows of the elastomer composition and therefore the risk of degrading the good penetrability of each outer strand.
• the intermediate layer of each outer strand is desaturated, preferably incompletely unsaturated.
• a layer of desaturated son is such that there is sufficient space between the son so as to allow the passage of an elastomer composition.
• an unsaturated layer means that the yarns of this layer do not touch each other and that there is sufficient space between two adjacent yarns of the layer allowing the passage of an elastomer composition through the layer, c that is, the inter-layer distance of the layer is non-zero.
• the interlayer distance of the intermediate layer of each outer strand is greater than or equal to 5 ⁇ m, more preferably greater than or equal to 10 ⁇ m, even more preferably greater than or equal to 20 ⁇ m and very preferably greater than or equal to 30 ⁇ m. In a very advantageous embodiment, the interlayer distance of the intermediate layer of each outer strand is greater than or equal to 35 ⁇ m, more preferably greater than or equal to 50 ⁇ m and even more preferably greater than or equal to 60 ⁇ m.
• an incompletely unsaturated layer is such that there is not enough room in this layer to add at least one (P + 1) ' th wire of the same diameter as the P son of the layer.
• Incompletely unsaturated outer strand intermediate layer is understood to mean that the sum SI2 'of the interlayer distances 12' of the intermediate layer C2 'is smaller than the diameter d2' of the intermediate strands F2 'of the intermediate layer C2'.
• each outer strand comprises a relatively large number of intermediate strands and therefore has a relatively high breaking force.
• the outer layer of each outer strand is desaturated, preferably completely unsaturated.
• the desaturation of the outer layer of each outer strand advantageously facilitates the passage of the elastomer composition in and through each outer strand.
• a layer of desaturated son is such that there is sufficient space between the son so as to allow the passage of an elastomer composition.
• an unsaturated layer means that the yarns of this layer do not touch each other and that there is sufficient space between two adjacent yarns of the layer allowing the passage of an elastomer composition through the layer, c that is, the inter-layer distance of the layer is non-zero.
• the inter-wire distance of the outer layer of each outer strand is greater than or equal to 5 ⁇ m, more preferably greater than or equal to 10 ⁇ m, even more preferably greater than or equal to 20 ⁇ m and very preferably greater than or equal to 30 ⁇ m. In a very advantageous embodiment, the inter-wire distance of the outer layer of each outer strand is greater than or equal to 35 ⁇ m, more preferably greater than or equal to 50 ⁇ m and even more preferably greater than or equal to 60 ⁇ m.
• a completely unsaturated layer is, as opposed to an incompletely unsaturated layer, such that there is sufficient space in this layer to add at least one (P + 1) ' th wire of the same diameter as the P son of the layer, several son can then be in contact with each other or not.
• an outer layer of completely unsaturated outer strand it is meant that the sum SI3 'of the interfilial distances 13' of the outer layer C3 'is greater than the diameter d3 'external son F3' of the outer layer C3 '.
• the inner wire of each outer strand has a diameter d1 'greater than or equal to the diameter d3' of each outer wire of each outer strand, preferably the inner wire of each outer strand has a diameter d1 'greater than the diameter d3' of each outer wire of each outer strand.
• the use of diameters such as d1 '> d3' makes it possible to promote the penetration of the elastomer composition through the outer layer.
• the inner wire of each outer strand has a diameter d1 'greater than or equal to the diameter d2' of each intermediate wire of each outer strand, preferably each inner wire of each outer strand has a diameter d1 'greater than the diameter d2' of each intermediate wire of each outer strand.
• the preferential use of diameters such as d1 '> d2' makes it possible to promote the penetrability of the elastomer composition through the intermediate layer.
• the inner wire of each outer strand has a diameter d1 greater than or equal to the diameter d2 'of each intermediate wire of said outer strand
• the inner wire of each outer strand has a diameter d1 greater than or equal to the diameter d3 'of each external wire of said outer strand.
• the inner wire of each outer strand has a diameter d1 'greater than the diameter d2' of each intermediate wire of said outer strand
• the inner wire of each outer strand has a diameter d1 'greater than the diameter d3' of each external wire of said outer strand.
• Such an outer strand has the advantages of architectural stability and penetrability presented above.
• the desaturation of the intermediate and outer layers, the incomplete saturation of the intermediate layer and the complete unsaturation of the outer layer are obtained by using different diameters of son.
• each intermediate wire of each outer strand having a diameter d2 'and each outer wire of each outer strand having a diameter d3', d2 ' d3'.
• the same wire diameter is used on the intermediate and outer layers of each outer strand which limits the number of different wires to be managed during the manufacture of the cable.
• the outer layer of the inner strand is desaturated, preferably completely unsaturated.
• the desaturation of the outer layer of the inner strand advantageously facilitates the passage of the elastomer composition to the center of the inner strand.
• a layer of desaturated son is such that there is sufficient space between the son so as to allow the passage of an elastomer composition.
• an unsaturated layer means that the yarns of this layer do not touch each other and that there is sufficient space between two adjacent yarns of the layer allowing the passage of an elastomer composition through the layer, c that is, the inter-layer distance of the layer is non-zero.
• the inter-wire distance of the outer layer of the inner strand is greater than or equal to 5 ⁇ m, more preferably greater than or equal to 10 ⁇ m, even more preferably greater than or equal to 20 ⁇ m and very preferably greater than or equal to 30 ⁇ m. .mu.m. In a very advantageous embodiment, the inter-wire distance of the outer layer of the inner strand is greater than or equal to 35 ⁇ m, more preferably greater than or equal to 50 ⁇ m and even more preferably greater than or equal to 60 ⁇ m.
• the outer layer of the inner strand is preferably completely unsaturated, that is to say that there is sufficient room in the outer layer to add at least one (N + 1) ' th wire of the same diameter as the N wires of the outer layer.
• the outer layer of the completely unsaturated inner strand it is meant that the sum SI3 of the interfilial distances 13 of the outer layer C3 is greater than the diameter d3 of the external wires F3 of the outer layer C3.
• each inner wire of the inner strand has a diameter d1 greater than or equal to the diameter d3 of each outer wire of the inner strand.
• the inner strand is two-layered.
• the outer layer of the inner strand is wound around the inner layer of the inner strand in contact with the inner layer of the inner strand.
• the inner strand comprises a wire assembly consisting of two layers of wires, neither more nor less, that is to say that the son assembly has two layers of son, not one, not three but only two.
• Q the inner wire of the inner strand radially out of the inner strand and even the cable. Thanks to the presence of several threads in the inner layer of internal strand (Q> 1), this risk is reduced, the compression forces then being distributed over the plurality of son of the inner layer.
• each inner wire of the inner strand has a diameter d1 equal to the diameter d3 of each outer wire of the inner strand.
• the same wire diameter is preferably used on the inner and outer layers of the inner strand which limits the number of different wires to be managed during the manufacture of the cable.
• the intermediate layer of each outer strand is wound around the inner layer of each outer strand in a winding direction identical to the winding direction of the cable.
• the intermediate layer of each outer strand is wound around the inner layer of each outer strand in a winding direction opposite to the winding direction of the cable.
• the inner strand is three-layered and comprises:
• An intermediate layer consisting of M intermediate yarns wound around the inner layer, and
• An outer layer consisting of N external wires wrapped around the intermediate layer.
• the outer layer of the inner strand is wound around the intermediate layer of the inner strand in contact with the intermediate layer of the inner strand and the intermediate layer of the inner strand is wound around the inner layer of the strand internal contact with the inner layer of the inner strand.
• the inner strand comprises a wire assembly consisting of three layers of wires, neither more nor less, that is to say that the assembly of son has three layers of son, not two, not four , but only three.
• the sum SI2 of the interlayer distances of the intermediate layer is such that SI2 ⁇ d3 with d3 being the diameter of each outer wire of the inner strand, preferably SI2 ⁇ 0.8 x d3.
• the diameter d3 of the outer son of the outer layer of the inner strand being preferably greater than the sum SI2, the outer son is prevented from entering the intermediate layer.
• the intermediate layer of the inner strand is desaturated, preferably incompletely unsaturated.
• a layer of desaturated son is such that there is sufficient space between the son so as to allow the passage of an elastomer composition.
• an unsaturated layer means that the yarns of this layer do not touch each other and that there is sufficient space between two adjacent yarns of the layer allowing the passage of an elastomer composition through the layer, c that is, the interfering distance of the layer is non-zero.
• the interlayer distance of the intermediate layer of the inner strand is greater than or equal to 5 ⁇ m, more preferably greater than or equal to 10 ⁇ m, even more preferably greater than or equal to 20 ⁇ m and very preferably greater than or equal to 30 ⁇ m. .mu.m. In a very advantageous embodiment, the interlayer distance of the intermediate layer of the inner strand is greater than or equal to 35 ⁇ m, more preferably greater than or equal to 50 ⁇ m and even more preferably greater than or equal to 60 ⁇ m.
• the desaturation of the intermediate layer of the inner strand advantageously facilitates the passage of the elastomer composition to the center of the inner strand.
• the intermediate layer of the inner strand is preferably incompletely unsaturated, that is to say that there is not enough space in the intermediate layer to include at least one (M + 1) 'th over same diameter as the M son of the intermediate layer.
• an intermediate layer of the incompletely unsaturated inner strand means that the sum SI2 of the interlayer distances 12 of the intermediate layer C2 is smaller than the diameter d2 of the intermediate strands F2 of the intermediate layer C2.
• Incomplete unsaturation of the intermediate layer of the inner strand ensures architectural stability of the intermediate layer.
• the incomplete unsaturation of the intermediate layer of the inner strand makes it possible to ensure that the inner strand comprises a relatively large number of intermediate strands and therefore has a relatively high breaking force.
• each inner wire of the inner strand has a diameter d1 greater than the diameter d3 of each outer wire of the inner strand.
• the use of diameters such as d1> d3 makes it possible to promote the penetration of the elastomer composition through the outer layer.
• each inner wire of the inner strand has a diameter d1 greater than or equal to the diameter d2 of each intermediate wire of the inner strand, preferably each inner wire of the inner strand has a diameter d1 greater than the diameter d2. of each intermediate wire of the inner strand.
• the preferential use of diameters such as d1> d2 makes it possible to promote the penetration of the elastomer composition through the intermediate layer.
• Q 1, 2, 3 or 4
• Q 1.
• the elastomer composition acts as a hooping layer around the inner strand, especially around the outer and middle layers of the inner strand preventing the release of the inner wire itself under repeated compression efforts.
• the steps p2 and p3 satisfy 0.38 ⁇ (p3-p2) / p3, preferably 0.40 ⁇ (p3-p2) / p3, more preferentially 0.43 ⁇ (p3-p2) / p3 and still more preferably 0.45 ⁇ (p3-p2) / p3.
• the steps p2 and p3 satisfy (p3-p2) / p3 ⁇ 0.55 and preferably (p3-p2) / p3 ⁇ 0.53.
• the dimension of the radial passage windows of the elastomer composition is maximum and makes it possible to optimize the penetrability of the inner strand.
• the pitch p2 is such that 8 mm ⁇ p2 ⁇ 16 mm, preferably 8 mm ⁇ p2 ⁇ 14 mm and more preferably 8 mm ⁇ p2 ⁇ 12 mm.
• the pitch p3 is such that 10 mm ⁇ p3 ⁇ 40 mm, preferably 15 mm ⁇ p3 ⁇ 35 mm, more preferably 15 mm ⁇ p3 ⁇ 25 mm and even more preferably 17 mm ⁇ p3 ⁇ 23 mm.
• P2 and p3 steps in these preferred ranges provide a cable having mechanical properties compatible with pneumatic use, a cost and a relatively low linear cable density.
• the inner wire of the inner strand has a diameter d1 greater than or equal to the diameter d2 of each intermediate wire of the inner strand
• the inner wire of the inner strand has a diameter d1 greater than or equal to the diameter d3 of each external wire of the inner strand.
• the inner wire of the inner strand has a diameter d1 greater than the diameter d2 of each intermediate wire of the inner strand
• the inner wire of the inner strand has a diameter d1 greater than the diameter d3 of each external wire of the inner strand.
• Such an inner strand has the advantages of architectural stability and penetrability presented above.
• the desaturation of the intermediate and outer layers, the incomplete saturation of the intermediate layer and the complete unsaturation of the outer layer are obtained by using different diameters of son.
• the elastomer composition prevents corrosive agents from accessing the central capillary, and in the best case where the central capillary is itself penetrated, the spread of these corrosive agents along the cable.
• the inner wires of the inner strand have a diameter d1 greater than or equal to the diameter d2 of each intermediate wire of the inner strand
• the inner wires of the inner strand have a diameter d1 greater than or equal to the diameter d3 of each external wire of the inner strand.
• the internal wires of the inner strand have a diameter d1 greater than the diameter d2 of each intermediate wire of the inner strand
• the inner wires of the inner strand have a diameter d1 greater than the diameter d3 of each external wire of the inner strand.
• Such an inner strand has the advantages of architectural stability and penetrability presented above.
• the desaturation of the intermediate and outer layers, the incomplete saturation of the intermediate layer and the complete unsaturation of the outer layer are obtained by using different diameters of son.
• each intermediate wire of the inner strand having a diameter d2 and each outer wire of the inner strand having a diameter d3, d2 d3.
• the same wire diameter is used on the intermediate and outer layers of the inner strand which limits the number of different wires to be managed during the manufacture of the cable.
• each intermediate wire of the inner strand has a diameter d2 greater than or equal to the diameter d2 'of each intermediate wire of each outer strand, preferably each intermediate wire of the inner strand has a diameter d2 greater than the diameter d2' of each intermediate wire of each outer strand.
• the intermediate layer of each outer strand is wound around the inner layer of each outer strand in a direction of winding identical to the winding direction of the cable.
• the intermediate layer of the inner strand is wound around the inner layer of the inner strand in a direction of winding identical to the winding direction of the cable.
• the intermediate layer of the inner strand is wound around the inner layer of the inner strand in a winding direction opposite to the winding direction of the cable.
• the inner layer of the inner strand is helically wound in a direction of winding identical to the direction of winding of the cable or, alternatively, in a winding direction opposite to the winding direction of the cable.
• the intermediate layer of each outer strand is wound around the inner layer of each outer strand in a winding direction opposite to the winding direction of the cable.
• the intermediate layer of the inner strand is wound around the inner layer of the inner strand in a winding direction identical to the winding direction of the cable.
• the intermediate layer of the inner strand is wound around the inner layer of the inner strand in a winding direction opposite to the winding direction of the cable.
• this second alternative of the second embodiment of the cable which is particularly preferred, it limits the friction of the wires of the adjacent layers and therefore their wear.
• the inner layer of the inner strand is helically wound in a direction of winding identical to the sense of winding of the cable or, alternatively, in a winding direction opposite to the winding direction of the cable.
• the wire has not sense because its step is infinite
• the winding direction can be either S or Z:
• the inner strand is of the gummed type in situ.
• a strand comprises, before assembly of the cable, a layer of a polymer composition, in particular an elastomer composition arranged between at least two radially adjacent layers of son, possibly between each layer of radially adjacent wires.
• a strand gummed in situ is described in particular in WO2010 / 054790.
• the inner strand is of the type not gummed in situ.
• not gummed in situ means that before assembly of the cable, the inner strand is made of the son of the different layers and devoid of polymer composition, in particular of elastomer composition.
• Another object of the invention is a tire comprising at least one cable as defined above.
• the tire comprises a carcass reinforcement anchored in two beads and radially surmounted by a crown reinforcement itself surmounted by a tread, the crown reinforcement being joined to said beads by two flanks and comprising at least one cable as defined above.
• the crown reinforcement comprises a protective armature and a working armature, the armature comprising at least one cable as defined above, the armature being radially interposed between the tread and the reinforcement.
• the cable is particularly intended for industrial vehicles chosen from heavy vehicles such as "heavy goods vehicles” - ie, metro, buses, road transport vehicles (trucks, tractors, trailers), off-the-road vehicles - agricultural or civil engineering machinery, other transport or handling vehicles.
• heavy vehicles such as "heavy goods vehicles” - ie, metro, buses, road transport vehicles (trucks, tractors, trailers), off-the-road vehicles - agricultural or civil engineering machinery, other transport or handling vehicles.
• the tire is for civil engineering type vehicle.
• the tire has a dimension in which the diameter, in inches, of the seat of the rim on which the tire is to be mounted is greater than or equal to 40 inches.
• FIG. 1 is a sectional view perpendicular to the direction circumferential of a tire according to the invention
• Fig. 2 is a detail view of zone II of Fig. 1;
• FIG. 3 is a schematic sectional view perpendicular to the axis of the cable (assumed rectilinear and at rest) of a cable [(0.38+ (6 + 11) ⁇ 0.35) + 6 ⁇ (0.38+ (6 + 11) x0.30)] + 0.28 according to a first embodiment of the invention;
• FIG. 4 is a view similar to that of FIG. 3 of a cable [(0.38 + (6 + 12) ⁇ 0.35) + 6 ⁇ (0.38 + (6 + 12) ⁇ 0.30) + 0.28 according to a second embodiment of the invention;
• FIG. 5 is a view similar to that of FIG. 3 of a cable [(0.38+ (6 + 11) ⁇ 0.35) + 6 ⁇ (0.35+ (5 ⁇ 0.35 + 11 ⁇ 0.30)] + 0.28 according to a third embodiment of the invention;
• FIG. 6 is a view similar to that of FIG. 3 of a cable [(1 + 6 + 12) ⁇ 0.40 + 7 ⁇ (0.32 + (6 + 11) ⁇ 0.26) + 0.28 according to a fourth embodiment of FIG. embodiment of the invention;
• FIG. 7 is a view similar to that of FIG. 3 of a cable [(3 + 9 + 15) ⁇ 0.38 + 6 ⁇ (0.45+ (6 + 11) ⁇ 0.38)] + 0.28 according to a fifth embodiment of FIG. embodiment of the invention;
• FIG. 8 is a view similar to that of FIG. 3 of a cable [(0.38+ (6 + 11) ⁇ 0.35) + 6 ⁇ (0.38 + (6 + 11) ⁇ 0.30) + 0.28 according to a sixth embodiment of the invention;
• FIG. 9 is a view similar to that of FIG. 3 of a cable [(0.60 + 6 ⁇ 0.4 + 11 ⁇ 0.45) + 6 ⁇ (0.45 + (6 + 11) ⁇ 0.38) + 0.28 according to a seventh embodiment of the invention.
• FIG. 10 is a view similar to that of FIG. 3 of a cable [(2 + 7) ⁇ 0.45 + 6 ⁇ (0.38 + (6 + 11) ⁇ 0.30) + 0.28 according to an eighth embodiment of FIG. the invention;
• FIG. 11 is a view similar to that of FIG. 3 of a cable [(3 + 8) ⁇ 0.42 + 6 ⁇ (0.38 + (6 + 11) ⁇ 0.30) + 0.28 according to a ninth mode of embodiment of the invention
• FIG. 12 is a view similar to that of FIG. 3 of a cable [(4 + 9) ⁇ 0.40 + 6 ⁇ (0.38 + (6 + 11) ⁇ 0.30) + 0.28 according to a tenth embodiment of FIG. the invention
• Figure 13 is a schematic view in projection on a plane comprising the axis of an outer strand before assembly of the cable according to the first embodiment of the invention.
• FIG. 14 is a detail view of the zone XIV showing a radial passage window delimited by intermediate layer wires and wires of an outer layer of the outer strand of FIG. 13.
• a reference X, Y, Z corresponding to the usual orientations respectively axial (X), radial (Y) and circumferential (Z) 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 equidistant from the annular reinforcing structures of each bead.
• FIGS. 1 and 2 show a tire according to the invention and designated by the general reference 10.
• the tire 10 is for a heavy vehicle of the civil engineering type, for example of the "dumper" type.
• the tire 10 has a dimension of 53 / 80R63 type.
• the tire 10 has a vertex 12 reinforced by a crown reinforcement 14, two flanks 16 and two beads 18, each of these beads 18 being reinforced with an annular structure, here a rod 20.
• the crown reinforcement 14 is radially surmounted by a tread 22 and joined to the beads 18 by the flanks 16.
• a carcass reinforcement 24 is anchored in the two beads 18, and here is wound around the two rods 20 and comprises a reversal 26 disposed towards the outside the tire 20 which is shown here mounted on a rim 28.
• the carcass reinforcement 24 is radially surmounted by the crown reinforcement 14.
• the carcass reinforcement 24 comprises at least one carcass ply 30 reinforced by radial carcass ropes (not shown).
• the carcass ropes are arranged substantially parallel to each other and extend from one bead 18 to the other so as to form an angle of between 80 ° and 90 ° with the median circumferential plane M (plane perpendicular to the axis of rotation of the tire which is located midway between the two beads 18 and passes through the middle of the crown reinforcement 14).
• the tire 10 also comprises a sealing ply 32 made of an elastomer (commonly called inner liner) which defines the radially inner face 34 of the tire 10 and which is intended to protect the carcass ply 30 from the diffusion of the tire. air from the interior space to the tire 10.
• a sealing ply 32 made of an elastomer (commonly called inner liner) which defines the radially inner face 34 of the tire 10 and which is intended to protect the carcass ply 30 from the diffusion of the tire. air from the interior space to the tire 10.
• the crown reinforcement 14 comprises, radially from the outside towards the inside of the tire 10, a protective reinforcement 36 arranged radially inside the tread 22, a working reinforcement 38 arranged radially at the inside of the protective armature 36 and an additional armature 40 arranged radially inside the armature 38.
• the armature 36 is thus radially interposed between the tread 22 and the armature of the armature. 38.
• the reinforcement 38 is radially interposed between the protective reinforcement 36 and the additional reinforcement 40.
• the protective armature 36 comprises first and second protective plies 42, 44 comprising protective metal cables, the first ply 42 being arranged radially inside the second ply 44.
• the cables protective metal form an angle at least equal to 10 °, preferably from 10 ° to 35 ° and preferably from 15 ° to 30 ° with the circumferential direction Z of the tire.
• the working armature 38 comprises first and second working plies 46, 48, the first ply 46 being arranged radially inside the second ply 48.
• Each ply 46, 48 comprises at least one cable 50.
• the metal ropes 50 are crossed from one working ply to the other and make an angle at most equal to 60 °, preferably from 15 ° to 40 ° with the circumferential direction Z of the tire.
• the additional reinforcement 40 also called limiter block, whose function is to partially recover the mechanical stresses of inflation, comprises, for example and in a manner known per se, additional metal reinforcing elements, for example such as described in FR 2 419 181 or FR 2 419 182 making an angle at most equal to 10 °, preferably ranging from 5 ° to 10 ° with the circumferential direction Z of the tire 10.
• FIG. 3 shows the cable 50 according to a first embodiment of the invention.
• the cable 50 is metallic and is of the multi-strand type with two cylindrical layers. Thus, it is understood that the strand layers constituting the cable 50 are in number two, no more, no less. The layers of strands are adjacent and concentric.
• the cable 50 is devoid of polymeric composition and elastomer composition when it is not integrated with the tire.
• the cable 50 comprises an inner layer C1 of the cable 50 and an outer layer CE of the cable 50.
• the inner layer C1 consists of a single inner strand T1.
• the cable 50 also comprises a band F consisting of a single wire hoop.
• the inner strand T1 has an infinite pitch.
• the outer layer CE is wound around the inner layer C1 in a winding direction of the cable, here the direction S.
• the outer strands TE are helically wound around the inner strand T1 at a pitch p such that 40 mm ⁇ p ⁇ 100 mm and preferably 50 mm ⁇ p
• the hoop F is wrapped around the outer layer CE in a direction of winding of the hoop, here opposite to the winding direction of the cable, in this case in the direction Z.
• the hoop wire is wound in helix around outer strands TE in a pitch pf such that 2 mm ⁇ pf
• the assembly constituted by the internal layers C1 and external CE, that is to say the cable 50 without the band F, has a diameter D greater than or equal to 4 mm and less than or equal to 6 mm, of preferably at 5 mm and more preferably at 4.3 mm.
• D 4.9 mm.
• the outer layer CE of the cable 50 is desaturated.
• the mean inter-strand distance E separating two adjacent outer TE strands is greater than or equal to 30 ⁇ m, more preferably greater than or equal to 40 ⁇ m, and still more preferably greater than or equal to 50 ⁇ m.
• the inter-strand distance of the external layer of outer strands is greater than or equal to 70 ⁇ m.
• E 87.3 ⁇ m.
• the inner strand T1 has a diameter D1 and each outer strand TE has a diameter DE such that the ratio DI / DE> 1, preferably DI / DE ⁇ 1, 05 and more preferably DI / DE ⁇ 1, 10.
• This DI / DE ratio is also such that DI / DE ⁇ 1, 40 and preferably DI / DE ⁇ 1, 35 and more preferably DI / DE ⁇ 1, 30.
• D1 1.78 mm
• DE 1.580 mm
• DI / DE 1.13.
• the inner strand T1 is at least two layers. In this case, the inner strand T1 is three-layered.
• the inner strand Tl comprises, here is made up of three layers, no more, no less.
• the inner strand T1 comprises an inner layer C1 consisting of Q internal thread (s) F1, an intermediate layer C2 consisting of M intermediate threads F2 wound helically around the inner layer C1 and an outer layer C3 constituted of N external wires F3 wound helically around the inner layer C1 and around and in contact with the intermediate layer C2.
• the inner wire F1 has an infinite pitch.
• the intermediate layer C2 of the inner strand T1 is wound around the inner layer C1 of the inner strand T1 in a winding direction Z opposite to the winding direction of the cable S.
• the intermediate threads F2 F are wound helically around internal wire F1 in a pitch p2 such that 8 mm ⁇ p2 ⁇ 16 mm, preferably 8 mm ⁇ p2 ⁇ 14 mm.
• p2 14 mm.
• the outer layer C3 of the inner strand T1 is wound around the inner and outer layers C1 and C2 of the inner strand T1 in a winding direction Z opposite to the winding direction of the cable S and in the same direction Z as the stratum intermediate C2 of the inner strand T1.
• the N external wires F3 are helically wound around the M intermediate wires F2 in a pitch p3 such that 10 mm ⁇ p3 ⁇ 40 mm, preferably 15 mm ⁇ p3 ⁇ 35 mm, more preferably 15 mm ⁇ p ⁇ 25 mm and even more preferably 17 mm ⁇ p ⁇ 23 mm.
• p3 20 mm.
• the intermediate layer C2 of the inner strand T1 is desaturated and incompletely unsaturated.
• the interfilial distance 12 of the intermediate layer C2 separating, on average, the M intermediate wires is greater than or equal to 5 ⁇ m.
• the interfilial distance 12 is preferably greater than or equal to 10 ⁇ m and here equal to 11.6 ⁇ m. Since the intermediate layer C2 is incompletely unsaturated, the sum SI2 of the interlayer distances 12 of the intermediate layer C2 is smaller than the diameter d2 of the intermediate wires F2 of the intermediate layer C2.
• the sum SI2 of the interlayer distances 12 of the intermediate layer C2 is smaller than the diameter d3 of the external wires F3 of the outer layer C3 and preferably less than or equal to 0.8 x d3.
• the outer layer C3 of the inner strand T1 is desaturated and completely unsaturated.
• the interfilial distance 13 of the outer layer C3 separating, on average, the N external wires is greater than or equal to 5 ⁇ .
• the interfilial distance 13 is preferably greater than or equal to 10 ⁇ , more preferably greater than or equal to 20 ⁇ m and even more preferably 30 ⁇ m. In this embodiment, the interfilial distance 13 is preferably greater than or equal to 35 ⁇ m and here equal to 45 ⁇ .
• the sum SI3 of the distances Interfilers 13 of the outer layer C3 is greater than the diameter d3 of the external wires F3 of the outer layer C3.
• Each inner, intermediate and outer wire of the inner strand T1 has a diameter d1, d2 and d3, respectively.
• Each diameter of the inner wires d1, intermediate d2 and external d3 of the inner strand T1 is from 0.15 mm to 0.60 mm, preferably from 0.20 mm to 0.50 mm, more preferably from 0.25 mm to 0 , 45 mm and even more preferably from 0.28 mm to 0.42 mm.
• the inner wire F1 of the inner strand T1 has a diameter d1 greater than or equal to the diameter d2 of each intermediate wire F2 of the inner strand T1.
• the inner wire F1 of the inner strand T1 has a diameter d1 greater than or equal to the diameter d3 of each outer wire F3 of the inner strand T1.
• each outer strand TE is three-layered.
• each outer strand TE comprises, here is made up of three layers, no more, no less.
• the internal wire F1 ' has an infinite pitch.
• the intermediate layer C2 'of each outer strand TE is wound around the inner layer C1' of each outer strand TE in a winding direction Z opposite to the winding direction S of the cable.
• the intermediate threads F 2 ' are helically wound around the internal thread (s) F1' in a pitch p2 'such that 8 mm ⁇ p2' ⁇ 16 mm, preferably 8 mm ⁇ p2 ' ⁇ 14 mm and more preferably 8 mm ⁇ p2 ' ⁇ 12 mm.
• p 2 ' 10 mm.
• each outer strand TE is wound around the intermediate layer C2' of each outer strand TE in a winding direction Z opposite to the winding direction S of the cable and in the same direction Z as the intermediate layer C2 'of each outer strand TE and in the same direction Z as the outer layer C3 of the inner strand Tl.
• the N' external strands F3 ' are helically wound around the intermediate threads M' F2 'in a pitch p3' such that 10 mm ⁇ p ⁇ 3> ⁇ 40 mm, preferably 15 mm ⁇ p ⁇ 3> ⁇ 35 mm, more preferably 15 mm ⁇ 3 ' ⁇ 25 mm and even more preferably 17 mm ⁇ p3' ⁇ 23 mm.
• p3 ' 20 mm.
• the intermediate layer C2 'of each outer strand TE is desaturated and incompletely unsaturated.
• the interfilial distance 12 'of the intermediate layer C2' separating, on average, the M 'intermediate threads is greater than or equal to 5 ⁇ m.
• the interfilial distance 12 ' is preferably greater than or equal to 10 ⁇ m, more preferably greater than or equal to 20 ⁇ m and even more preferably 30 ⁇ m. In this embodiment, the interfilial distance 12 'is preferably greater than or equal to 35 ⁇ m and here equal to 35.4 ⁇ m.
• the sum SI2' of the interlayer distances 12 'of the intermediate layer C2' is smaller than the diameter d2 'of the intermediate wires F2' of the intermediate layer C2 '.
• the sum SI2 'of the interlayer distances 12' of the intermediate layer C2 ' is smaller than the diameter d3' of the external wires F3 'of the outer layer C3' and preferably less than or equal to 0.8 x d3 .
• the outer layer C3 'of each outer strand TE is desaturated and completely unsaturated.
• the interfilial distance 13 'of the outer layer C3' separating, on average, the N 'external wires is greater than or equal to 5 ⁇ m.
• the interfilial distance 13 ' is preferably greater than or equal to 10 ⁇ m, more preferably greater than or equal to 20 ⁇ m and even more preferably 30 ⁇ m.
• the interfilial distance 13 ' is preferably greater than or equal to 35 ⁇ m and more preferably greater than or equal to 50 ⁇ m and here equal to 55.4 ⁇ m.
• the sum SI3 'of the interfilial distances 13' of the outer layer C3 ' is greater than the diameter d3' of the external wires F3 'of the outer layer C3'.
• Each inner, intermediate and outer wire of each outer strand TE has a diameter d1 ', d2' and d3 ', respectively.
• Each diameter of the inner wires d1 ', intermediate d2' and external d3 'of the inner strand T1 is from 0.15 mm to 0.60 mm, preferably from 0.20 mm to 0.50 mm, more preferably from 0.25 to mm to 0.45 mm and even more preferably from 0.28 mm to 0.42 mm.
• the internal wire F1 'of each outer strand TE has a diameter d1' greater than or equal to the diameter d2 'of each intermediate wire F2' of each outer strand TE.
• Thread internal FV of each outer strand TE has a diameter dV greater than or equal to the diameter d3 'of each outer wire F3' of each outer strand TE.
• Each internal wire F1 of the inner strand T1 has a diameter d1 greater than or equal to the diameter dV of each inner wire F1 'of each outer strand TE, preferably each inner wire F1 of the inner strand T1 has a diameter d1 equal to the diameter dV of each inner wire F1 'of each outer strand TE.
• Each inner wire F1 of the inner strand T1 has a diameter d1 greater than or equal to the diameter d2 'of each intermediate wire F2' of each outer strand TE, preferably each inner wire F1 of the inner strand T1 has a diameter d1 greater than diameter d2 'of each intermediate wire F2' of each outer strand TE.
• Each internal wire F1 of the inner strand T1 has a diameter d1 greater than or equal to the diameter d3 'of each outer wire F3' of each outer strand TE, preferably each inner wire F1 of the inner strand T1 has a diameter d1 greater than diameter d3 'of each outer wire F3' of each outer strand TE.
• Each intermediate wire F2 of the inner strand T1 has a diameter d2 greater than or equal to the diameter d2 'of each intermediate wire F2' of each outer strand TE.
• Each outer wire F3 of the inner strand T1 has a diameter d3 greater than or equal to the diameter d3 'of each outer wire F3 of each outer strand TE.
• Each wire has a breaking strength, denoted Rm, such that 2500 ⁇ Rm ⁇ 3100 MPa.
• the steel of these threads is said to be of grade SHT ("Super High Tensile").
• Other yarns may be used, for example lower grade yarns, for example of grade NT ("Normal Tensile") or HT ("High Tensile"), such as yarns of higher grade, for example of UT grade (" Ultra Tensile ”) or MT (" Mega Tensile ").
• the cable according to the invention is manufactured using a method comprising steps that are well known to those skilled in the art.
• steps that are well known to those skilled in the art.
• the son or strands do not undergo torsion around their own axis, due to a synchronous rotation before and after the assembly point; either by twisting: in such a case, the strands or strands undergo both a twist collective and an individual twist around their own axis, which generates a torque of detorsion on each son or strands.
• the internal strand previously described is manufactured according to known methods comprising the following steps, preferably carried out online and continuously:
• a first assembly step by twisting or cabling the M intermediate threads around the internal thread (s) the inner layer C1 at the pitch p2 and in the direction Z to form the intermediate layer C2 in a first assembly point;
• torque balancing is meant here in a manner well known to those skilled in the art the cancellation of residual torsional torques (or elastic torsion return) exerted on each wire of the strand, in the intermediate layer as in the outer layer.
• each strand is wound on one or more reception coils, for storage, before the subsequent operation of assembling wiring of the elementary strands to obtain the multi-strand cable.
• the manufacture of the multi-strand cable of the invention one proceeds in a manner well known to those skilled in the art, by wiring or twisting the previously obtained strands, using twisting or cabling machines sized to assemble strands.
• the L outer strands TE are assembled around the inner strand T1 at pitch p and in the direction S to form the cable 50.
• the band F is wound at pitch pf in the Z direction around the assembly previously obtained.
• the cable is then incorporated by calendering to composite fabrics formed of a known composition based on natural rubber and carbon black as a reinforcing filler, conventionally used for the manufacture of radial tire crown reinforcement.
• This composition essentially comprises, in addition to the elastomer and the reinforcing filler (carbon black), an antioxidant, stearic acid, an extension oil, cobalt naphthenate as adhesion promoter, finally a vulcanization system (sulfur, accelerator, ZnO).
• the composite fabrics reinforced by these cables comprise an elastomeric composition matrix formed of two thin layers of elastomeric composition which are superimposed on both sides of the cables and which respectively have a thickness of between 1 and 4 mm included terminals.
• the calender pitch (no laying of the cables in the elastomeric composition fabric) ranges from 4 mm to 8 mm.
• FIG. 4 shows a cable 51 according to a second embodiment of the invention.
• the elements similar to the first embodiment are designated by identical references. Unless otherwise stated, only the differences from the first embodiment are described.
• the interfilial distance 13 of the outer layer C3 separating, on average, the N external wires is equal to 12 ⁇ m.
• the sum SI3 of the interfilial distances 13 of the outer layer C3 is smaller than the diameter d3 of the external wires F3 of the outer layer C3.
• the outer layer C3 'of each outer strand TE is desaturated, here completely unsaturated.
• the interfilial distance 13 'of the outer layer C3' separating, on average, the N 'external wires is equal to 25.7 ⁇ m.
• the sum SI3 'of the interfilial distances 13' of the outer layer C3 ' is greater than the diameter d3' of the external wires F3 'of the outer layer C3'.
• FIG. 5 shows a cable 52 according to a third embodiment of FIG. the invention.
• the elements similar to the first embodiment are designated by identical references. Unless otherwise stated, only the differences from the first embodiment are described.
• the inner strand of the cable 52 according to the third embodiment is identical to the inner strand of the cable 50 according to the first embodiment.
• the steps p2 'and p3' satisfy 0.36 ⁇ ( ⁇ 3'- ⁇ 2 ') / ⁇ 3' ⁇ 0.57.
• (p3'-p2 ') / p3' 0.50.
• the intermediate layer C2 'of each outer strand TE is desaturated and incompletely unsaturated.
• the interfilential distance 12 'of the intermediate layer C2' separating, on average, the M 'intermediate wires is equal to 57.5 ⁇ m.
• the sum SI2 'of the interlayer distances 12' of the intermediate layer C2 ' is smaller than the diameter d3' of the external wires F3 'of the outer layer C3' and preferably less than or equal to 0.8 x d3 '.
• the outer layer C3 'of each outer strand TE is desaturated and completely unsaturated.
• the interfilial distance 13 'of the outer layer C3' separating, on average, the N 'external wires is equal to 74.7 ⁇ m.
• the sum SI3 'of the interfilial distances 13' of the outer layer C3 ' is greater than the diameter d3' of the external wires F3 'of the outer layer C3'.
• the internal wire F1 'of each outer strand TE has a diameter d1' equal to the diameter d2 'of each intermediate wire F2' of each outer strand TE.
• the internal wire F1 'of each outer strand TE has a diameter d1' greater than the diameter d3 'of each wire external F3 'of each outer strand TE.
• Each diameter d2 'of each intermediate wire F2' of each outer strand TE and each diameter d3 'of each outer wire F3' of each outer strand TE are such that d2 '>d3'.
• Each intermediate wire F2 of the inner strand T1 has a diameter d2 equal to the diameter d2 'of each intermediate wire F2' of each outer strand TE.
• each inner wire F1 of the inner wire T1 of the cable 52 according to the third embodiment has a diameter d1 greater than or equal to the diameter d1 'of each inner wire F1' each outer strand TE.
• each inner wire F1 of the inner strand T1 has a diameter d1 greater than the diameter d1 'of each inner wire FV of each outer strand TE.
• FIG. 6 shows a cable 53 according to a fourth embodiment of the invention.
• the elements similar to the first embodiment are designated by identical references. Unless otherwise stated, only the differences from the first embodiment are described.
• the diameter D1 of the inner strand T1 and the diameter DE of each outer strand TE are such that the ratio DI / DE ⁇ 1, 30, preferably DI / DE ⁇ 1, 35 and more preferably DI / DE ⁇ 1, 40.
• This ratio DI / DE is also such that DI / DE ⁇ 1, 70, preferably DI / DE ⁇ 1, 65 and more preferably DI / DE ⁇ 1, 60.
• D1 2.01 mm
• DE 1, 36 mm
• the intermediate layer C2 of the inner strand T1 is saturated.
• the interfilial distance 12 of the intermediate layer C2 separating on average the M intermediate wires is equal to 0 ⁇ m.
• the interfilial distance 13 of the outer layer C3 separating on average the N external son is less than 5 microns. Here, it is equal to 4.9 ⁇ m.
• the intermediate layer C2 'of each outer strand TE is desaturated and incompletely unsaturated.
• the interfilial distance 12 'of the intermediate layer C2' separating on average the M 'intermediate threads is equal to 27.1 microns.
• the sum SI2 'of the interlayer distances 12' of the intermediate layer C2 ' is smaller than the diameter d3' of the external wires F3 'of the outer layer C3' and preferably less than or equal to 0.8 x d3 '.
• the outer layer C3 'of each outer strand TE is desaturated and completely unsaturated.
• the interfilial distance 13 'of the outer layer C3' separating, on average, the N 'external wires is equal to 46.6 ⁇ m.
• the sum SI3 'of the interfilial distances 13' of the outer layer C3 ' is greater than the diameter d3' of the external wires F3 'of the outer layer C3'.
• FIG. 7 shows a cable 54 according to a fifth embodiment of the invention.
• the elements similar to the first embodiment are designated by identical references. Unless otherwise stated, only the differences from the first embodiment are described.
• the inner layer C1 of the inner strand T1 is wound in a winding direction Z opposite to the winding direction S of the cable.
• this direction could be identical to the direction in the direction of winding S of the cable.
• the internal Q F1 son are helically wound in a pitch p1 such that 5 mm ⁇ p1 ⁇ 10 mm.
• p1 6.5 mm.
• the intermediate layer C2 of the inner strand T1 is desaturated and completely unsaturated.
• the interfilial distance 12 of the intermediate layer C2 separating the average M intermediate son is equal to 14.6 microns.
• the sum SI2 of the interlayer distances 12 of the intermediate layer C2 is smaller than the diameter d3 of the external wires F3 of the outer layer C3 and preferably less than or equal to 0.8 ⁇ d3.
• the interfilial distance 13 of the outer layer C3 separating on average the N external son is equal to 7 microns.
• the intermediate layer C2 'of each outer strand TE is desaturated and incompletely unsaturated.
• the interfilial distance 12 'of the intermediate layer C2' separating, on average, the M 'intermediate wires is equal to 25.7 ⁇ m.
• the sum SI2 'of the interlayer distances 12' of the intermediate layer C2 ' is smaller than the diameter d3' of the external wires F3 'of the outer layer C3' and preferably less than or equal to 0.8 x d3 '.
• the outer layer C3 'of each outer strand TE is desaturated and completely unsaturated.
• the interfilial distance 13 'of the outer layer C3' separating, on average, the N 'external wires is equal to 57.5 ⁇ m.
• the sum SI3 'of the interfilial distances 13' of the outer layer C3 ' is greater than the diameter d3' of the external wires F3 'of the outer layer C3'.
• the cable 54 according to the fifth embodiment is such that:
• each intermediate wire F2 of the inner strand T1 has a diameter d2 equal to the diameter d2 'of each intermediate wire F2' of each outer strand TE.
• each outer wire F3 of the inner strand T1 has a diameter d3 equal to the diameter d3 'of each outer wire F3 of each outer strand TE.
• FIG. 8 shows a cable 55 according to a sixth embodiment of the invention.
• the elements similar to the first embodiment are designated by identical references. Unless otherwise stated, only differences from the first embodiment are described.
• the cable 55 according to the sixth embodiment differs from the cable 50 according to the first embodiment by its inner strand Tl.
• the inner strand T1 of the cable 55 according to the sixth embodiment is such that the steps p2 and p3 satisfy 0.36 ⁇ (p3-p2) / p3 ⁇ 0.57.
• the steps p2 and p3 satisfy 0.38 ⁇ (p3-p2) / p3, preferably 0.40 ⁇ (p3-p2) / p3, more preferably 0.43 ⁇ (p3-p2) / p3 and even more preferentially 0.45 ⁇ (p3-p2) / p3.
• the steps p2 and p3 also satisfy (p3-p2) / p3 ⁇ 0.55 and preferably (p3-p2) / p3 ⁇ 0.53.
• the interfilial distance 12 of the intermediate layer C2 separating the average M intermediate son is equal to 8.2 microns.
• the outer layer C3 of the inner strand is desaturated and completely unsaturated.
• the interfilial distance 13 of the outer layer C3 separating, on average, the N external wires is equal to 45 ⁇ m.
• the sum SI3 of the interfilial distances 13 of the outer layer C3 is greater than the diameter d3 of the external wires F3 of the outer layer C3.
• FIG. 9 shows a cable 56 according to a seventh embodiment of the invention.
• the elements similar to the first embodiment are designated by identical references. Unless otherwise stated, only the differences from the first embodiment are described.
• the intermediate layer C2 of the inner strand T1 is desaturated and incompletely unsaturated.
• the interfilial distance 12 of the intermediate layer C2 separating on average the M intermediate wires is equal to 39.1 ⁇ m.
• the sum SI2 of the interlayer distances 12 of the intermediate layer C2 is smaller than the diameter d3 of the external wires F3 of the outer layer C3 and preferably less than or equal to 0.8 ⁇ d3.
• the outer layer C3 of the inner strand T1 is desaturated and completely unsaturated.
• the interfilial distance 13 of the outer layer C3 separating, on average, the N external wires is equal to 107.2 ⁇ m.
• the sum SI3 of the interfilial distances 13 of the outer layer C3 is greater than the diameter d3 of the external wires F3 of the outer layer C3.
• each outer strand TE of the cable 56 according to the seventh embodiment is such that the M intermediate wires F2 'are wound helically around the inner wire F1' according to a pitch p2 'such that 8 mm ⁇ p2' ⁇ 16 mm, preferably 8 mm ⁇ p2 ' ⁇ 14 mm.
• p 2 ' 12.5 mm.
• the N external wires F3 'are helically wound around the intermediate wires F2' in a pitch p3 ' 25 mm.
• the intermediate layer C2 'of each outer strand TE is desaturated and incompletely unsaturated.
• the inter-wire distance 12 'of the intermediate layer C2' separating, on average, the M 'intermediate wires is equal to 29.1 ⁇ m.
• the sum SI2 'of the interlayer distances 12' of the intermediate layer C2 ' is smaller at the diameter d3 'of the outer threads F3' of the outer layer C3 'and preferably less than or equal to 0.8 x d3'.
• the outer layer C3 'of each outer strand TE is desaturated and completely unsaturated.
• the interfilial distance 13 'of the outer layer C3' separating, on average, the N 'external wires is equal to 61.3 ⁇ m.
• the sum SI3 'of the interfilial distances 13' of the outer layer C3 ' is greater than the diameter d3' of the external wires F3 'of the outer layer C3'.
• each intermediate wire F2 of the inner strand T1 has a diameter d2 greater than or equal to the diameter d2 'of each intermediate wire F2' of each outer strand TE.
• each outer thread F3 of the inner strand T1 has a diameter d3 greater than or equal to the diameter d3 'of each outer thread F3 of each outer strand TE.
• FIG. 10 shows a cable 57 according to an eighth embodiment of the invention.
• the elements similar to the first embodiment are designated by identical references. Unless otherwise stated, only the differences from the first embodiment are described.
• the cable 57 according to the eighth embodiment differs from the cable 50 according to the first embodiment by its inner strand Tl.
• the inner strand T1 is two-layered.
• the inner strand Tl comprises, here is made up of two layers, no more, no less.
• the inner strand T1 comprises an inner layer C1 consisting of Q internal thread (s) F1, and an outer layer C3 consisting of N external wires F3 helically wound around and in contact with the inner layer C1.
• the inner layer C1 of the inner strand T1 is wound helically in a winding direction Z opposite to the winding direction of the cable S.
• the outer layer C3 of the inner strand T1 is wound around the inner layer C1 of the inner strand T1 in a winding direction Z opposite to the winding direction of the cable S and in the same direction Z as the inner layer C1
• the outer N wires F3 are helically wound around the internal wires F1 in a pitch p3 such that 10 mm ⁇ p3 ⁇ 40 mm, preferably 15 mm ⁇ p3 ⁇ 35 mm and more preferably 15 mm ⁇ p3 ⁇ 25 mm.
• p3 15.4 mm.
• the outer layer C3 of the inner strand T1 is desaturated and completely unsaturated.
• the interfilial distance 13 of the outer layer C3 separating, on average, the N external wires is equal to 124.2 ⁇ m.
• the sum SI3 of the interfilial distances 13 of the outer layer C3 is greater than the diameter d3 of the external wires F3 of the outer layer C3.
• FIG. 11 a cable 58 according to a ninth embodiment of the invention. Elements similar to the eighth embodiment are designated by identical references. Unless otherwise stated, only differences from the eighth embodiment are described.
• the cable 58 according to the ninth embodiment differs from the cable 57 according to the eighth embodiment by its inner strand Tl.
• the outer layer C3 of the inner strand T1 is desaturated and completely unsaturated.
• the interfilial distance 13 of the outer layer C3 separating, on average, the N external wires is equal to 75.8 ⁇ m.
• the sum SI3 of the interfilial distances 13 of the outer layer C3 is greater than the diameter d3 of the external wires F3 of the outer layer C3.
• FIG. 12 There is shown in Figure 12 a cable 59 according to a tenth embodiment of the invention. Elements similar to the eighth embodiment are designated by identical references. Unless otherwise stated, only differences from the eighth embodiment are described.
• the cable 59 according to the tenth embodiment differs from the cable 50 according to the eighth embodiment by its inner strand Tl.
• the outer layer C3 of the inner strand T1 is desaturated and completely unsaturated.
• the interfilial distance 13 of the outer layer C3 separating, on average, the N external wires is equal to 56.4 ⁇ m.
• the sum SI3 of the interfilial distances 13 of the outer layer C3 is greater than the diameter d3 of the external wires F3 of the outer layer C3.
• Such a permeability test is well known to those skilled in the art and makes it possible to determine the longitudinal permeability to air of the cables tested, by measuring the volume of air passing through a specimen under constant pressure for a given time.
• the principle of such a test is to demonstrate the effectiveness of the treatment of a cable to make it impermeable to air; it has been described for example in ASTM D2692-98.
• Such a test is performed on cables from manufacturing and not aged.
• the raw cables are pre-coated from the outside by an elastomeric coating composition.
• a series of 10 cables arranged in parallel is placed between two layers or "skims" (two rectangles of 80 x 200 mm) of a diene elastomeric composition composition in the raw state each skim having a thickness of 5 mm; the whole is then locked in a mold, each of the cables being kept under a sufficient tension (for example 3 daN) to ensure its straightness during the establishment in the mold, using clamping modules; then the vulcanization (baking) is carried out for about 10 to 12 hours at a temperature of about 120 ° C and a pressure of 15 bar (rectangular piston 80 x 200 mm). After which, the assembly is demolded and cut 10 pieces of cables thus coated, in the form of parallelepipeds of dimensions 7x7x60 mm, for characterization.
• elastomeric coating composition As elastomeric coating composition is used a conventional elastomer (s) diene (s) composition for tire, based on natural rubber (peptized) and carbon black N330 (65 phr), further comprising the usual additives: sulfur (7 phr), sulfenamide accelerator (1 phr), ZnO (8 phr), stearic acid (0.7 phr), antioxidant (1.5 phr), cobalt naphthenate (1.5 phr) ( pce means parts by weight per hundred parts of elastomer); the modulus E10 of the elastomeric coating composition is approximately 10 MPa.
• the test is carried out on 6 cm of cable length, thus coated by its surrounding elastomeric composition (or elastomeric coating composition) in the fired state, in the following manner: air is sent to the cable inlet, under a pressure of 1 bar, and the volume of air at the outlet is measured using a flow meter (calibrated for example from 0 to 500 cm 3 / min).
• a flow meter calibrated for example from 0 to 500 cm 3 / min.
• the cable sample is locked in a compressed seal (eg a dense foam or rubber seal) in such a way that only the amount of air passing through the cable from one end to the other, along its longitudinal axis, is taken into account by the measure; the tightness of the seal itself is checked beforehand using a test piece of solid elastomeric composition, that is to say without cable.
• the average air flow measured (average of the 10 specimens) is even lower than the longitudinal imperviousness of the cable is high.
• measured values less than or equal to 0.2 cm3 / min are considered to be zero; they correspond to a cable that can be described as airtight (totally airtight) along its axis (ie, in its longitudinal direction).
• Such an indicator of penetrability of the strand is an image of the impermeability of the strand to the air. Indeed, the larger the size of the windows, the higher the penetration indicator, the more likely the elastomer composition to enter the strand and the strand is impervious to air.
• the permeability could also be determined by the permeability test described above applied to the strand. Nevertheless, for the purposes of speed for the evaluation of the strands, the inventors preferred the simulation and the calculation of the windows S with respect to the permeability test.
• a result greater than 100 at one or the other of these tests means that the cable or the strand tested has impermeability or penetrability greater than the cable or control cable, here the T1 cable or the T1 cable strands.
• the cable 50 according to the invention has a greater imperviousness than twice that of the control cable T1 and only because of the ratio ( ⁇ 3'- ⁇ 2 ') / ⁇ 3' intermediate layers C2 ' and external C3 'of the outer strand TE according to the invention.
• control cables T1, T2 shows that the fact that the outer layers C3 and C3 'are wound in the same direction which is opposite to the winding direction of the L outer strands TE (T1 cable) is an essential characteristic of the invention to ensure good impermeability of the cable.
• Each table 2 to 6 corresponds respectively to a pitch p3 'equal to 15, 17, 20, 23, 25 mm.
• the value of the penetration indicator is significantly greater than that obtained for the corresponding control strand.
• linear son that is to say right, and conventional circular cross section.
• the intermediate layer of each outer strand is wound around the inner layer of each outer strand according to the invention. a winding direction identical to the winding direction of the cable.
• the inner layer of the inner strand is wound helically in a winding direction identical to the winding direction of the cable.
• the inner layer of the inner strand is wound helically in a winding direction opposite to the winding direction of the cable.
• the intermediate layer of each outer strand is wound around the inner layer of each strand external in a winding direction opposite to the winding direction of the cable.
• the inner layer of the inner strand is wound helically in a winding direction identical to the winding direction of the cable.
• winding directions of the embodiments and alternatives envisaged above may be indifferently S or Z.

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• 2016
  • 2016-12-20 FR FR1662936A patent/FR3060616A1/fr not_active Withdrawn
• 2017
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  • 2017-12-20 US US16/470,477 patent/US11535982B2/en active Active
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