WO2021094675A1 - Câble multi-torons à deux couches avec couche interne gainée à pénétrabilité améliorée - Google Patents
Câble multi-torons à deux couches avec couche interne gainée à pénétrabilité améliorée Download PDFInfo
- Publication number
- WO2021094675A1 WO2021094675A1 PCT/FR2020/051996 FR2020051996W WO2021094675A1 WO 2021094675 A1 WO2021094675 A1 WO 2021094675A1 FR 2020051996 W FR2020051996 W FR 2020051996W WO 2021094675 A1 WO2021094675 A1 WO 2021094675A1
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- WO
- WIPO (PCT)
- Prior art keywords
- cable
- layer
- strand
- internal
- outer layer
- Prior art date
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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
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B1/00—Constructional features of ropes or cables
- D07B1/16—Ropes or cables with an enveloping sheathing or inlays of rubber or plastics
- D07B1/165—Ropes or cables with an enveloping sheathing or inlays of rubber or plastics characterised by a plastic or rubber inlay
-
- 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
- D07B2201/2075—Fillers
- D07B2201/2079—Fillers characterised by the kind or amount of filling
- D07B2201/2081—Fillers characterised by the kind or amount of filling having maximum filling
-
- 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
Definitions
- the invention relates to multi-strand cables which can be used in particular for reinforcing tires, particularly tires for heavy industrial vehicles.
- a tire 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 carcass reinforcement and the tread bearing.
- This crown reinforcement comprises several plies of elastomeric composition, optionally reinforced by reinforcing elements such as cables or monofilaments, of the metallic or textile type.
- the crown reinforcement generally comprises at least two superimposed crown plies, sometimes called working plies or crossed plies, of which the reinforcing elements, generally metallic, are arranged practically parallel to each other inside the 'a ply, but crossed from one ply to another, that is to say inclined, symmetrically or not, with respect to the median circumferential plane, by an angle which is generally between 10 ° and 45 °.
- the working plies generally comprise reinforcing elements having a very low elongation so as to perform their function of guiding the tire.
- the crown reinforcement can also include various other plies or layers of auxiliary elastomeric composition, of varying widths depending on the case, with or without reinforcing elements.
- so-called protective plies responsible for protecting the rest of the belt from external attacks, perforations, or even so-called hooping plies comprising reinforcing elements oriented substantially in the circumferential direction (so-called zero plies degree), whether radially external or internal with respect to the working plies.
- Protective plies generally include reinforcing elements having a high elongation so as to deform under the effect of a stress exerted by an indenter, for example a rock.
- a working ply reinforcing element comprising a two-layer multi-strand wire rope as disclosed in the examples of WO2016051669 is known from the state of the art.
- This cable comprises an inner layer of the cable consisting of an inner strand and an outer layer of the cable consisting of seven outer strands helically wound around the inner layer of the cable.
- the inner strand comprises an inner layer of the strand consisting of two inner metal wires and an outer layer of the strand consisting of nine outer metal wires.
- each outer strand comprises an inner layer of the strand consisting of three inner metal wires and an outer layer of the strand consisting of eight outer metal wires.
- this type of tire is usually rolled over an uneven surface, sometimes leading to perforations in the tread.
- These perforations allow the entry of corrosive agents, for example air and water, which oxidize the metal reinforcing elements of the crown reinforcement, in particular of the crown plies, and considerably reduce the life of the tire. .
- One solution for increasing the life of the tire is to fight against the propagation of these corrosive agents. It is thus possible to provide for covering each metal wire with an elastomeric composition during the manufacture of the cable. During this process, the elastomeric composition present 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 force of the cable. Generally, 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.
- the object of the invention is a cable having improved penetrability of its outer strands and better accessibility of the inner strand by the elastomer composition compared to the cable of application WO2016051669, thus making it possible to reduce the entry and the propagation. corrosive agents in and along the cable without degrading the breaking force of the cable.
- the invention relates to a two-layer multi-strand cable which comprises:
- an internal layer of the cable made up of K> 1 internal strand (s), the or each internal strand being in two layers and comprising:
- the outer layer of the or each inner strand is desaturated so that the sum SI3 of the interwire distances 13 of the outer layer of the or each inner strand is greater than or equal to the diameter d3;
- the cable is obtained by a process comprising:
- Any interval of values designated by the expression “between a and b” represents the domain of values ranging 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 helix radius R2 of the outer layer of the cable is the radius of the theoretical circle passing through the centers of the outer strands of the outer layer in a plane perpendicular to the axis of the cable.
- the diameter of a strand is the diameter of the smallest circle in which the strand is circumscribed.
- a layer of desaturated threads is such that there is sufficient space between the metal threads so as to allow the passage of an uncrosslinked elastomer composition.
- the outer layer of each strand is desaturated which means that the metal wires of the outer layer do not touch each other and that there is sufficient space between two adjacent external metal wires allowing the passage of an elastomer composition, that is to say such that the sum of the interwire distances is greater than or equal to the diameter of the wire.
- the interwire distance of a layer is defined, on a section of the cable perpendicular to the main axis of the cable, as the shortest distance which separates, on average, two adjacent threads of the diaper.
- the interwire distance is calculated by dividing the sum of the interwire distances by the number of spaces separating the son of the layer. In other words, a layer can be desaturated when the interwire distance is greater than or equal to 5 ⁇ m.
- the interwire distance I3 of the outer layer of the or each inner strand is greater than or equal to 15 ⁇ m, more preferably greater than or equal to 35 ⁇ m, even more preferably greater than or equal to 50 ⁇ m and very preferably greater than or equal to 60 ⁇ m.
- the interwire distance I3 'of the outer layer of each outer strand is greater than or equal to 15 ⁇ m, more preferably greater than or equal to 35 ⁇ m, even more preferably greater than or equal to 50 ⁇ m and very preferably greater than or equal to 60 ⁇ m.
- the interwire distance of the outer layer of each strand is less than or equal to 100 ⁇ m.
- a saturated layer of threads is such that there is not enough space between the metal threads so as to allow the passage of an elastomer composition, that is to say such that the sum of the inter-wire distances is strictly less than the diameter of the wire.
- the cable has two layers of strands, that is to say it comprises an assembly made up 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.
- 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.
- the inner layer of the cable is surrounded by an elastomeric composition having a thickness G and then surrounded by an outer layer.
- the cable according to the invention has improved penetrability compared to a cable of the examples of WO2011000963 which is not penetrated due to the absence of an elastomeric composition between the inner layer and the outer layer.
- the inventors behind the invention hypothesize that this initial ratio R2 / Rt ranging from 1.02 to 1.25 makes it possible to have a sufficient thickness of elastomeric composition allowing it to infiltrate into the internal strand and to fill the gaps.
- the desaturation of the outer layers 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 (s) allowing thus pushing the elastomeric composition resulting from the sheath into the internal strand (s) in order to penetrate the central capillary.
- a final step making it possible to bring the outer strands closer to the inner layer, it is thus possible to reduce the diameter of the cable while making it very well penetrated.
- the or each internal strand has cylindrical layers.
- each outer strand has cylindrical layers.
- the or each internal strand and each external strand have cylindrical layers. It is recalled that such cylindrical layers are obtained when the different layers of a strand are wound at different pitches and / or when the winding directions of these layers are different from one layer to another.
- a strand with cylindrical layers is very strongly penetrable unlike a strand with compact layers in which the pitches of all the layers are equal and the winding directions of all the layers are identical, which has a much lower penetrability.
- 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 makes a complete turn around said axis of the cable. 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 makes a complete turn around said axis of the strand.
- the direction of winding of a layer of strands or wires is understood to mean the direction formed by the strands or wires with respect to the axis of the cable or strand.
- the direction of winding is commonly designated by the letter either Z or S.
- the strands do not undergo preformation.
- the cable is metallic.
- metallic cable is meant 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 designated hereinafter by “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.
- carbon steel When a carbon steel is advantageously used, 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 metallic layer improving, for example. the processing properties of the metallic cable and / or its constituent elements, or the usage properties of the cable and / or of the tire themselves, such as the adhesion properties, corrosion resistance or else of resistance to aging.
- the steel used is covered with a layer of brass (Zn-Cu alloy) or of zinc.
- the wires 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 wires or strands have the same diameter within industrial tolerances.
- the outer strands are wound helically around the inner strand at a pitch ranging from 40 mm to 100 mm and preferably ranging from 50 mm to 90 mm.
- the outer layer of the cable is saturated.
- a saturated cable layer is such that the inter-strand distance of the outer strands is strictly less than 20 ⁇ m.
- the inter-strand distance of the outer layer of outer strands is 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 two strands are inscribed. external adjacent.
- a desaturated cable layer is such that the inter-strand distance of the outer strands is greater than or equal to 20 ⁇ m.
- L is less than or equal to the maximum number of outer strands Lmax that can be placed on the theoretical outer layer having a helix radius Rt and L is such that the outer layer is incompletely unsaturated.
- an incompletely unsaturated layer is such that there is not enough room in this layer to add at least one (P + 1) th strand of the same diameter as the P strands of the layer.
- a completely unsaturated layer is, as opposed to an incompletely unsaturated layer, such that there is enough room in this layer to add at least one (P + 1) th strand of the same diameter as the P strands of the layer, several strands may then or may not be in contact with each other. In this case, there is sufficient room in the outer layer to add at least one (L + 1) th strand of the same diameter as the L outer strands of the outer layer.
- L is equal to the maximum number of outer strands Lmax that can be arranged on the theoretical outer layer having a helix radius Rt and L is such that the outer layer is incompletely unsaturated.
- the outer layer comprises a high number of outer strands and therefore exhibits a relatively high breaking force.
- the thickness G of the sheath of elastomeric composition is strictly greater than 0 mm and preferably greater than or equal to 0.01 mm. The greater the thickness G of the elastomeric composition, the better the penetrability in the inner layer.
- the thickness G of the sheath of elastomeric composition is less than or equal to 0.80 mm, preferably less than or equal to 0.60 mm and more preferably less than or equal to 0.52 mm. This thickness optimizes the penetrability of the inner layer while limiting the outer 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.
- L 6, 7, 8, 9 or 10
- the most severe transverse forces are the transverse forces exerted by the external strands on the internal strand.
- the presence of the elastomeric composition will make it possible to relieve contact pressures towards the internal strand while ensuring good penetrability of the latter.
- This drawback can be overcome thanks to the sheath around the K internal strands making it penetrable by the elastomer composition which then prevents corrosive agents from accessing the central capillary, which is itself penetrated, and prevents the propagation of these agents. corrosive along the cable.
- cables in which K> 1 the most severe transverse forces exerted in the cable when it is under tension are the transverse forces exerted between the internal strands.
- cables are known having an architecture in which K> 1 and comprising a number of outer strands such that the outer layer of the cable is saturated so as to maximize the breaking force by adding a maximum number of outer strands.
- the cable has, on the one hand, spaces between the outer wires allowing the passage of the elastomer composition and therefore making the cable less susceptible to corrosion.
- the desaturation of the outer layer of the strands allows the elastomer composition to penetrate on the one hand, between the outer yarns and, on the other hand, to push the elastomeric composition of the sheath between the internal strands so as to form a cushion of elastomer composition at least partially absorbing the transverse forces exerted between the internal strands.
- better corrosion resistance is obtained.
- Q the inner wire of the inner strand comes out radially from the inner strand and even from the cable. Thanks to the presence of several wires in the internal layer of the internal strand (Q> 1), this risk is reduced, the compressive forces then being distributed over the plurality of wires of the internal layer.
- N 7, 8, 9 or 10.
- each internal wire of the internal strand has a diameter d1 equal to the diameter d3 of each external wire of the internal strand.
- the same wire diameter is preferably used on the internal and external layers of the internal strand, which limits the number of different wires to be managed during the manufacture of the cable.
- N 7, 8, 9 or 10.
- each inner wire of the outer strand has a diameter dT equal to the diameter d3 'of each outer wire of the outer strand.
- the same wire diameter is preferably used on the internal and external layers of the outer strand, which limits the number of different wires to be managed during the manufacture of the cable.
- each internal metal wire of each internal strand has a diameter d1 equal to the diameter d3 of each external wire of each internal strand
- each internal metal wire of each external strand has a diameter dT equal to the diameter d3 'of each external wire of each external strand
- each metal wire respectively has a diameter d1, dT, d3, d3 'ranging from 0.10 mm to 0.60 mm, preferably from 0.12 mm to 0.50 mm and more preferably from 0, 15mm to 0.42mm.
- Another object of the invention is a method of manufacturing a two-layer multi-strand cable, in which:
- the internal layer is surrounded with an elastomeric composition having a thickness G to form a sheathed internal layer, the thickness G of elastomeric composition being such that the ratio R2 / Rt ranges from 1.02 to 1.25 with Rt being the radius helix the theoretical outer layer obtained when the inner layer is directly in contact with the theoretical outer layer;
- the steps of helically assembling the K> 1 internal strands and the L> 1 external strands around the internal layer of the cable are carried out by cabling.
- the means used to bring the outer layer of the cable closer to the circle in which the inner layer of the cable is circumscribed are, for example, made up of two rows of rollers mounted opposite but offset and between which one runs the cable.
- one of the rows is mobile and can be brought closer to the fixed row so that the cable undergoes a succession of bending.
- the rows of rollers are movable around the axis of the cable.
- 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 strip bearing and working frame.
- 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 vehicle of the civil engineering type.
- the tire has a dimension in which the diameter, in inches, of the seat of the rim on which the tire is intended to be mounted is greater than or equal to 40 inches.
- FIG. 1 is a sectional view perpendicular to the circumferential direction of a tire according to the invention
- FIG. 2 is a detail view of zone II of Figure 1;
- FIG. 3 is a sectional view of a reinforced product according to the invention.
- FIG. 4 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. 5 is a view similar to that of Figure 4 of a cable (60) according to a second embodiment of the invention.
- FIG. 6 is a view similar to that of Figure 4 of a cable (70) according to a third embodiment of the invention.
- FIG. 7 is a view similar to that of Figure 4 of a cable (80) according to a fourth embodiment of the invention.
- FIGS. 8 and 9 are schematic representations of an installation for manufacturing a cable (50) according to a first embodiment of the invention.
- FIG. 10 is a schematic representation of the step 400 of bringing the outer layer closer to the inner layer of a cable (50) according to a first embodiment of the invention.
- FIG. 11 is a photograph of a control cable (T1) and a cable (50) according to a first embodiment of the invention.
- FIG. 1 and 2 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 reinforcement structures. of each bead.
- the tire 10 is for a heavy vehicle of the civil engineering type, for example of the “dumper” type.
- the tire 10 has a size of the 53 / 80R63 type.
- the tire 10 comprises a crown 12 reinforced by a crown reinforcement 14, two sidewalls 16 and two beads 18, each of these beads 18 being reinforced with an annular structure, here a bead wire 20.
- the crown reinforcement 14 is radially surmounted by a tread 22 and joined to the beads 18 by the sidewalls 16.
- a carcass reinforcement 24 is anchored in the two beads 18, and is here wound around the two bead wires 20 and comprises an upturn 26 disposed towards the exterior of the tire 20 which is shown here mounted on a rim 28.
- the carcass reinforcement 24 is surmounted radially by the crown reinforcement 14.
- the carcass reinforcement 24 comprises at least one carcass ply 30 reinforced by radial carcass cables (not shown).
- the carcass cables 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 an inner rubber) which defines the radially internal face 34 of the tire 10 and which is intended to protect the carcass ply 30 from the diffusion of air. air coming from the space inside the tire 10.
- a sealing ply 32 made of an elastomer (commonly called an inner rubber) which defines the radially internal face 34 of the tire 10 and which is intended to protect the carcass ply 30 from the diffusion of air. air coming from the space inside 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 on the inside. inside the protective frame 36 and an additional frame 40 arranged radially inside the working frame 38.
- the protective frame 36 is thus radially interposed between the tread 22 and the reinforcement. working 38.
- the working frame 38 is radially interposed between the protective frame 36 and the additional frame 40.
- the protective frame 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 metals form an angle at least equal to 10 °, preferably ranging from 10 ° to 35 ° and preferably from 15 ° to 30 ° with the circumferential direction Z of the tire.
- the working frame 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 working cables 50 are crossed from one working ply to the other and form an angle at most equal to 60 °, preferably ranging from 15 ° at 40 ° with the circumferential direction Z of the tire.
- the additional reinforcement 40 also called limiting block, the function of which is to partially take up the mechanical inflation stresses, 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 forming 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 a reinforced product according to the invention and designated by the general reference 100.
- the reinforced product 100 comprises at least one cable 50, in the species several cables 50, embedded in the elastomeric matrix 102.
- FIG. 3 shows the elastomeric matrix 102, the cables 50 in an X, Y, Z reference in which the Y direction is the radial direction and the X and Z directions are the axial and circumferential directions.
- 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.
- FIG. 4 shows the cable 50 according to a first embodiment of the invention.
- the cable 50 is shown before step 400 of bringing the outer layer CE of the cable closer to the circle in which the inner layer C1 of the cable is circumscribed.
- the cable 50 is metallic and is of the multi-strand type with two cylindrical layers. Thus, it is understood that the layers of strands 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 K> 1 internal strand (s) Tl.
- the internal layer C1 is surrounded by an elastomeric composition having a thickness G then forming the sheathed internal layer CIG.
- the outer layer CE consists of L> 1 outer strands TE wound around the inner layer CIG sheathed of the cable having a helix radius R2.
- R2 is here equal to 2.50 mm.
- the thickness G of elastomeric composition is such that the ratio R2 / Rt ranges from 1.02 to 1.25 with Rt being the helix radius the theoretical outer layer CET obtained when the internal layer C1 is directly in contact with the theoretical external layer CET.
- the cable 50 is finally obtained by a method comprising a step 500 for bringing the outer layer CE of the cable closer to the circle in which the inner layer C1 of the cable is circumscribed so that the ratio R2 / Rt goes to 1 , 00 to 1, 10.
- the cable 50 also includes a hoop F, not shown, consisting of a single hoop wire.
- the outer layer C3 of each inner strand Tl is desaturated and is incompletely unsaturated. Being desaturated, the interwire distance of the outer layer of each inner strand is greater than or equal to 15 ⁇ m, more preferably greater than or equal to 35 ⁇ m, even more preferably greater than or equal to 50 ⁇ m and very preferably greater than or equal to 60 ⁇ m and here equal to 66 pm.
- the sum SI3 of the interwire distances I3 of the external layer of each internal strand is greater than or equal to the diameter d3 of the external wires of the external layer of each internal strand
- Each internal and external wire of each internal strand Tl respectively has a diameter d1 and d3.
- Each diameter of the internal d1 and external d3 wires of each internal strand T1 ranges from 0.10 mm to 0.60 mm, preferably from 0.12 mm to 0.50 mm and more preferably from 0.14 mm to 0.42 mm.
- the outer layer C3 ′ of each outer strand TE is desaturated. Being desaturated, the interwire distance I3 ′ of the outer layer C3 ′ separating on average the N ′ outer yarns is greater than or greater than or equal to 15 ⁇ m, more preferably greater than or equal to 35 ⁇ m, even more preferably greater than or equal to 50 ⁇ m and very preferably greater than or equal to 60 ⁇ m and here equal to 66 ⁇ m.
- the sum SI3 'of the interwire distances I3' of the outer layer of each outer strand is greater than or equal to the diameter d3 of the outer son of the outer layer of each outer strand
- Each inner and outer wire of each outer strand TE has a diameter dT and d3 ’, respectively.
- Each diameter of the internal dT and external d3 'wires of each external strand TE ranges from 0.10 mm to 0.60 mm, preferably from 0.12 mm to 0.50 mm and more preferably from 0.14 mm to 0, 42 mm.
- the CE outer layer of the cable is desaturated.
- the mean inter-strand distance E separating two adjacent external strands TE is therefore greater than or equal to 20 ⁇ m.
- the mean inter-strand distance E separating two adjacent external strands TE is greater than or equal to 40 ⁇ m and more preferably to 50 ⁇ m.
- the inter-strand distance E is equal to 125 ⁇ m.
- Each wire has a tensile strength, denoted Rm, such that 2500 ⁇ Rm ⁇ 3100 MPa.
- the steel of these wires is said to be 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 ”).
- a step 100 K> 1 internal strands T1 are assembled in a helix by cabling to form an internal layer C1 of the cable.
- the internal layer C1 is surrounded with an elastomeric composition having a thickness G to form an internal sheathed layer CIG, the thickness G of the elastomeric composition being such that the ratio R2 / Rt ranges from 1, 02 to 1, 25 with Rt being the helix radius of the theoretical outer layer CET obtained when the inner layer C1 is directly in contact with the theoretical outer layer CET.
- torsional balancing is meant here, 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 of the strand, in the middle layer as in the outer layer.
- each strand is wound on one or more receiving spools, for storage, before the subsequent cabling operation of the elementary strands to obtain the multi-strand cable.
- a step 300 L> 1 outer strands TE is helically assembled by cabling around the inner layer Cl of the cable.
- means 500 are used to bring the outer layer CE of the cable closer to the circle in which the inner layer C1 of the cable is circumscribed so that the ratio R2 / Rt ranges from 1.00 to 1.10 .
- This step 400 is described with reference to FIG. 10.
- the means 500 used to bring the outer layer CE of the cable closer to the circle in which the inner layer C1 of the cable is circumscribed for example, consist of two rows of rollers mounted opposite but offset and between which we run the cable. Each row contains between 6 and 8 rollers. One of the rows is mobile and can be brought closer to the fixed row so that the cable undergoes a succession of bending. These rows of rollers can be fixed or movable around the axis of the cable.
- the cable undergoes a succession of bends which make it possible to reduce its diameter as illustrated in FIG. 10.
- L is equal to the maximum number of outer strands (TE) Lmax that can be placed on the theoretical outer layer (CET) having a helix radius Rt and L is such that the outer layer (CE) is incompletely unsaturated.
- TE outer strands
- CET theoretical outer layer
- the thickness G of the sheath of elastomeric composition is strictly greater than 0 mm and preferably greater than or equal to 0.01 mm. and the thickness G is less than or equal to 0.80 mm, preferably less than or equal to 0.60 mm and more preferably less than or equal to 0.52 mm.
- G 0.05 mm.
- 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 S 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 1 and 4 mm.
- the calendering pitch (laying the cables in the fabric of elastomeric composition) ranges from 4 mm to 8 mm.
- FIG. 5 shows a cable 60 according to a second embodiment of the invention.
- the cable 60 is shown before the step 400 of bringing the outer layer CE of the cable closer to the circle in which the inner layer C1 of the cable is circumscribed.
- Elements similar to the first embodiment are designated by references identical.
- FIG. 6 shows a cable 70 according to a third embodiment of the invention after step 400 of bringing the outer layer CE closer together. cable of the circle in which the internal layer C1 of the cable is circumscribed.
- FIG. 7 shows a cable 80 according to a fourth embodiment of the invention after step 400 of bringing the outer layer CE closer together. cable of the circle in which the internal layer C1 of the cable is circumscribed.
- This test makes it possible to determine the longitudinal permeability to air of the cables tested, by measuring the volume of air passing through a test piece 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 standard ASTM D2692-98.
- Such a test is carried out on cables resulting from manufacture and not aged.
- the raw cables are coated beforehand from the outside with an elastomeric composition called coating.
- a series of 10 cables arranged in parallel is placed between two layers or "skims" (two rectangles of 80 x 200 mm) of an elastomeric diene composition in the uncured state, each skim having a thickness of 5 mm; the whole is then locked in a mold, each of the cables being maintained under sufficient tension (for example 3 daN) to guarantee its straightness during installation in the mold, using clamping modules; then vulcanization (baking) is carried out for approximately 10 to 12 hours at a temperature of approximately 120 ° C and under a pressure of 15 bar (piston rectangular 80 x 200 mm). After which, the assembly is removed from the mold and 10 test pieces of cables thus coated, in the form of parallelepipeds of dimensions 7 ⁇ 7 ⁇ 60 mm, for characterization.
- the elastomeric coating composition is a composition of diene elastomer (s) conventional for tires, based on natural rubber (peptized) and carbon black N330 (65 phr), further comprising the following usual additives: sulfur (7 pce), sulfenamide accelerator (1 pce), ZnO (8 pce), stearic acid (0.7 pce), antioxidant (1, 5 pce), cobalt naphthenate (1, 5 pce) ( phr meaning parts by weight per hundred parts of elastomer); the E10 modulus of the elastomeric coating composition is approximately 10 MPa.
- the test is carried out over 6 cm of cable length, therefore coated with its surrounding elastomeric composition (or elastomeric coating composition) in the baked state, as follows: air is sent to the entry of the cable, under a pressure of 1 bar, and the volume of air at the outlet is measured using a flowmeter (calibrated for example from 0 to 500 cm 3 / min).
- a flowmeter calibrated for example from 0 to 500 cm 3 / min.
- the cable sample is blocked in a compressed airtight seal (e.g. a dense foam or rubber seal) such 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 measurement; the tightness of the tight seal itself is checked beforehand using a test specimen of solid elastomeric composition, that is to say without cable.
- the measured average air flow rate (average over the 10 specimens) is all the lower as the longitudinal impermeability of the cable is high.
- the measured values less than or equal to 0.2 cm 3 / min are considered to be zero; they correspond to a cable which can be qualified as airtight (totally airtight) along its axis (ie, in its longitudinal direction).
- Table 2 summarizes the characteristics of the indicator cables T1 and T2 and of the cable of the state of the art EDT (example 3 of WO2016051669).
- Table 2 respectively for the various indicator cables T 1 and T2, the cable of the state of the art EDT, and the cables according to the invention 50, 60 and 80. The results of these tests are given in base 100. Thus, a result 100 to either of these tests means that the tested cable exhibits maximum penetrability, i.e. the cable is completely airtight.
- Table 5 greater than that of the control cable T1 and therefore a penetrability close to 100% and this, only because of the ratio R2 / Rt in accordance with the invention. It can also be seen in FIG. 11 that the central capillary is completely penetrated for the cable 50 while that of T1 is not, the arrows indicating the areas where the elastomeric composition is lacking. Likewise, the cable 60 according to the invention has a penetrability greater than that of the cable of the state of the art EDT.
- the cable 80 according to the invention has a penetrability markedly greater than that of the control cable than that of the control cable T2.
- Tables 3 to 5 show that, for various cable constructions, the penetration of the elastomeric composition into the cable, and therefore the accessibility of the internal strand by this elastomeric composition, is significantly improved for an R2 / ratio.
Landscapes
- Ropes Or Cables (AREA)
- Tires In General (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202080079296.4A CN114729504B (zh) | 2019-11-15 | 2020-11-05 | 具有包覆的内层和改善的渗透性的双层多线股帘线 |
JP2022527169A JP2023502224A (ja) | 2019-11-15 | 2020-11-05 | 被覆内層を有する、浸透性が改善された2層マルチストランドケーブル |
CA3154431A CA3154431A1 (fr) | 2019-11-15 | 2020-11-05 | Cable multi-torons a deux couches avec couche interne gainee a penetrabilite amelioree |
AU2020383800A AU2020383800A1 (en) | 2019-11-15 | 2020-11-05 | Two-layer multi-strand cable having a sheathed inner layer and improved penetrability |
EP20817460.7A EP4058627A1 (fr) | 2019-11-15 | 2020-11-05 | Câble multi-torons à deux couches avec couche interne gainée à pénétrabilité améliorée |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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FRFR1912767 | 2019-11-15 | ||
FR1912767 | 2019-11-15 |
Publications (1)
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WO2021094675A1 true WO2021094675A1 (fr) | 2021-05-20 |
Family
ID=70008639
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/FR2020/051996 WO2021094675A1 (fr) | 2019-11-15 | 2020-11-05 | Câble multi-torons à deux couches avec couche interne gainée à pénétrabilité améliorée |
Country Status (6)
Country | Link |
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EP (1) | EP4058627A1 (fr) |
JP (1) | JP2023502224A (fr) |
CN (1) | CN114729504B (fr) |
AU (1) | AU2020383800A1 (fr) |
CA (1) | CA3154431A1 (fr) |
WO (1) | WO2021094675A1 (fr) |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS4740188Y1 (fr) * | 1969-12-16 | 1972-12-05 | ||
FR2419181A1 (fr) | 1978-03-10 | 1979-10-05 | Michelin & Cie | Perfectionnements aux pneumatiques a carcasse radiale |
FR2419182A1 (fr) | 1978-03-10 | 1979-10-05 | Michelin & Cie | Pneumatique a carcasse radiale, notamment pour engins de genie civil |
US20040045652A1 (en) * | 2000-12-01 | 2004-03-11 | Stijn Vanneste | Steel cord for reinforcing off-the-road tires and conveyor belts |
WO2011000963A2 (fr) | 2009-07-03 | 2011-01-06 | Societe De Technologie Michelin | Cable multitorons dont les torons elementaires sont des cables a deux couches gommes in situ |
WO2016051669A1 (fr) | 2014-10-01 | 2016-04-07 | 株式会社ブリヂストン | Câblé en acier pour renforcer un article en caoutchouc, et pneumatique l'utilisant |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2841573A1 (fr) * | 2002-06-26 | 2004-01-02 | Michelin Soc Tech | Cables hybrides a couches utilisables pour renforcer des pneumatiques |
FR2959517B1 (fr) * | 2010-04-28 | 2012-09-21 | Michelin Soc Tech | Cable metallique multitorons elastique a haute permeabilite. |
FR2990962B1 (fr) * | 2012-05-25 | 2014-06-27 | Michelin & Cie | Procede de fabrication d'un cable metallique multi-torons a deux couches. |
FR2997410B1 (fr) * | 2012-10-30 | 2016-01-01 | Michelin & Cie | Cable gomme in situ comprenant une composition comprenant un copolymere de styrene-butadiene. |
FR3032978B1 (fr) * | 2015-02-19 | 2017-10-27 | Michelin & Cie | Cable multitorons de structure 1xn pour armature de protection de pneumatique |
FR3017885A1 (fr) * | 2015-06-16 | 2015-08-28 | Michelin & Cie | Cable metallique multi-torons |
EP3728730B1 (fr) * | 2017-12-19 | 2022-06-29 | Compagnie Générale des Etablissements Michelin | Câbles multi-torons à deux couches à très bas, bas et moyen modules |
WO2019122724A1 (fr) * | 2017-12-19 | 2019-06-27 | Compagnie Generale Des Etablissements Michelin | Câbles multi-torons à deux couches à très bas, bas et moyen modules |
-
2020
- 2020-11-05 CA CA3154431A patent/CA3154431A1/fr active Pending
- 2020-11-05 EP EP20817460.7A patent/EP4058627A1/fr active Pending
- 2020-11-05 WO PCT/FR2020/051996 patent/WO2021094675A1/fr unknown
- 2020-11-05 AU AU2020383800A patent/AU2020383800A1/en active Pending
- 2020-11-05 JP JP2022527169A patent/JP2023502224A/ja active Pending
- 2020-11-05 CN CN202080079296.4A patent/CN114729504B/zh active Active
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS4740188Y1 (fr) * | 1969-12-16 | 1972-12-05 | ||
FR2419181A1 (fr) | 1978-03-10 | 1979-10-05 | Michelin & Cie | Perfectionnements aux pneumatiques a carcasse radiale |
FR2419182A1 (fr) | 1978-03-10 | 1979-10-05 | Michelin & Cie | Pneumatique a carcasse radiale, notamment pour engins de genie civil |
US20040045652A1 (en) * | 2000-12-01 | 2004-03-11 | Stijn Vanneste | Steel cord for reinforcing off-the-road tires and conveyor belts |
WO2011000963A2 (fr) | 2009-07-03 | 2011-01-06 | Societe De Technologie Michelin | Cable multitorons dont les torons elementaires sont des cables a deux couches gommes in situ |
US8863490B2 (en) * | 2009-07-03 | 2014-10-21 | Michelin Recherche Et Techniques S.A. | Multi-strand cord in which the basic strands are dual layer cords, rubberized in situ |
WO2016051669A1 (fr) | 2014-10-01 | 2016-04-07 | 株式会社ブリヂストン | Câblé en acier pour renforcer un article en caoutchouc, et pneumatique l'utilisant |
Non-Patent Citations (1)
Title |
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ANONYMOUS: "Micro-alloyed steel cord constructions for tyres", RESEARCH DISCLOSURE, KENNETH MASON PUBLICATIONS, HAMPSHIRE, UK, GB, vol. 349, no. 84, 1 May 1993 (1993-05-01), XP007119044, ISSN: 0374-4353 * |
Also Published As
Publication number | Publication date |
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CN114729504B (zh) | 2023-07-11 |
EP4058627A1 (fr) | 2022-09-21 |
CN114729504A (zh) | 2022-07-08 |
JP2023502224A (ja) | 2023-01-23 |
AU2020383800A1 (en) | 2022-05-19 |
CA3154431A1 (fr) | 2021-05-20 |
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