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WO2021112049A1 - Fibre, procédé de fabrication de câblé revêtu de résine, et procédé de fabrication de pneu - Google Patents

Fibre, procédé de fabrication de câblé revêtu de résine, et procédé de fabrication de pneu Download PDF

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Publication number
WO2021112049A1
WO2021112049A1 PCT/JP2020/044558 JP2020044558W WO2021112049A1 WO 2021112049 A1 WO2021112049 A1 WO 2021112049A1 JP 2020044558 W JP2020044558 W JP 2020044558W WO 2021112049 A1 WO2021112049 A1 WO 2021112049A1
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WO
WIPO (PCT)
Prior art keywords
resin
cord
belt
manufacturing
peripheral surface
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2020/044558
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English (en)
Japanese (ja)
Inventor
誓志 今
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bridgestone Corp
Original Assignee
Bridgestone Corp
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Filing date
Publication date
Application filed by Bridgestone Corp filed Critical Bridgestone Corp
Publication of WO2021112049A1 publication Critical patent/WO2021112049A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • D07B1/062—Reinforcing cords for rubber or plastic articles the reinforcing cords being characterised by the strand 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
    • 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
    • B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
    • B60C9/20—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
    • D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
    • D02G3/02—Yarns or threads characterised by the material or by the materials from which they are made
    • D02G3/04—Blended or other yarns or threads containing components made from different materials
    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
    • D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
    • D02G3/02—Yarns or threads characterised by the material or by the materials from which they are made
    • D02G3/12—Threads containing metallic filaments or strips
    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
    • D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
    • D02G3/22—Yarns or threads characterised by constructional features, e.g. blending, filament/fibre
    • D02G3/40—Yarns in which fibres are united by adhesives; Impregnated yarns or threads
    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
    • D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
    • D02G3/44—Yarns or threads characterised by the purpose for which they are designed
    • D02G3/48—Tyre cords
    • 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
    • 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
    • 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
    • D07B1/167—Ropes or cables with an enveloping sheathing or inlays of rubber or plastics characterised by a plastic or rubber inlay having a predetermined shape
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B7/00—Details of, or auxiliary devices incorporated in, rope- or cable-making machines; Auxiliary apparatus associated with such machines
    • D07B7/02—Machine details; Auxiliary devices
    • D07B7/14—Machine details; Auxiliary devices for coating or wrapping ropes, cables, or component strands thereof
    • D07B7/145—Coating or filling-up interstices
    • 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
    • D07B2201/2042—Strands characterised by a coating
    • D07B2201/2044—Strands characterised by a coating comprising polymers
    • 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
    • D07B2201/2042—Strands characterised by a coating
    • D07B2201/2045—Strands characterised by a coating comprising multiple layers
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/20—Rope or cable components
    • D07B2201/2015—Strands
    • D07B2201/2046—Strands comprising fillers
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2207/00—Rope or cable making machines
    • D07B2207/40—Machine components
    • D07B2207/404—Heat treating devices; Corresponding methods
    • D07B2207/4059—Heat treating devices; Corresponding methods to soften the filler material

Definitions

  • This disclosure relates to a method for manufacturing fibers and resin-coated cords, and a method for manufacturing pneumatic tires.
  • US Publication No. 2014/311120 describes a reinforcement cord provided on a two-layer belt that constitutes a pneumatic tire.
  • the reinforcing cord is formed by including a plurality of spirally twisted metal strands and a filled rubber filled between the plurality of metal strands.
  • a plurality of metal wires constituting the reinforcing cord provided on the belt are adhered by a filled rubber filled between the metal wires. That is, the filled rubber functions as an adhesive member for adhering a plurality of metal strands.
  • thermoplastic resin may be used as an adhesive resin as an adhesive member for adhering a plurality of metal wires.
  • the resin is filled to the central portion of the plurality of metal wires through the gaps between the narrow metal wires. There must be. Therefore, the filling pressure varies, and a hollow portion in which the adhesive resin does not exist may be formed inside the reinforcing cord.
  • An object of the present disclosure is that, as compared with the case where the reinforcing cord is formed by filling the molten resin between the plurality of metal strands from the outside, a hollow portion in which the adhesive resin does not exist is generated inside the reinforcing cord. Is to suppress.
  • the fiber according to the present disclosure is characterized by including a plurality of metal strands and a plurality of resin strands formed of a thermoplastic resin.
  • the fiber includes a plurality of metal strands and a plurality of resin strands formed of a thermoplastic resin.
  • the resin wire is melted, and the melted resin forms an adhesive resin for adhering a plurality of metal wires.
  • a reinforcing cord is formed in which a plurality of metal strands are bonded by an adhesive resin.
  • a reinforcing cord is formed by forming an adhesive resin that adheres a plurality of metal wires by melting the resin wires constituting the fiber. Therefore, as compared with the case where the reinforcing cord is formed by filling the molten resin between the plurality of metal strands from the outside, it is possible to suppress the formation of a hollow portion in which the adhesive resin does not exist inside the reinforcing cord. be able to.
  • the fibers according to the present disclosure there is a hollow portion in which no adhesive resin is present inside the reinforcing cord, as compared with the case where the reinforcing cord is formed by filling the molten resin between the plurality of metal strands from the outside. It can be suppressed from occurring.
  • (A) is a cross-sectional view showing a reinforcing cord formed by using the fiber according to the embodiment of the present disclosure and a reinforcing cord formed by using the fiber according to the comparative embodiment, respectively. It is a perspective view which showed the fiber which concerns on the comparative embodiment with respect to the embodiment of this disclosure. It is a process drawing used for explaining the manufacturing method of the resin coating cord which concerns on the comparative embodiment with respect to the embodiment of this disclosure.
  • the arrow W shown in the figure indicates the tire width direction (hereinafter, “tire width direction”), and the arrow R indicates the tire radial direction (hereinafter, “tire radial direction”).
  • the tire width direction is a direction parallel to the tire rotation axis, and the tire radial direction is a direction orthogonal to the tire rotation axis.
  • the reference numeral CL indicates the equatorial plane of the tire 10 (hereinafter, “tire equatorial plane”).
  • the pneumatic tire 10 of the present embodiment is, for example, a so-called radial tire used in a passenger car, and as shown in FIG. 1, includes a pair of bead portions 20 in which a bead core 12 is embedded, and one bead portion 20 and the other.
  • a carcass 16 composed of one carcass ply 14 straddles the bead portion 20 in a toroid shape.
  • the pneumatic tire 10 includes a belt 26 provided on the outer side of the carcass 16 in the tire radial direction and a tread 36 provided on the outer side of the belt 26 in the tire radial direction. Note that FIG. 1 shows the shape of the pneumatic tire 10 in a natural state before being filled with air.
  • the carcass ply 14 is formed by coating a plurality of cords (not shown) extending in the radial direction of the pneumatic tire 10 with coated rubber (not shown). That is, the pneumatic tire 10 of the present embodiment is a so-called radial tire.
  • the material of the cord of the carcass ply 14 is, for example, PET, but other conventionally known materials may be used.
  • the end portion of the carcass ply 14 in the tire width direction is folded outward in the tire radial direction so as to surround the bead core 12.
  • the portion extending from one bead core 12 to the other bead core 12 is referred to as a main body portion 14a
  • the portion folded back from the bead core 12 is referred to as a folded portion 14b.
  • a bead filler 18 whose thickness gradually decreases from the bead core 12 toward the outside in the tire radial direction is arranged between the main body portion 14a and the folded-back portion 14b of the carcass ply 14.
  • the bead portion 20 is formed from the outer end 18a of the bead filler 18 in the tire radial direction to the inner portion in the tire radial direction.
  • Inner liner 22, side rubber layer 24 An inner liner 22 made of rubber is arranged inside the carcass 16 in the tire width direction, and a side rubber layer 24 made of a first rubber material is arranged outside the carcass 16 in the tire width direction.
  • the tire case 25 is composed of the bead core 12, the carcass 16, the bead filler 18, the inner liner 22, and the side rubber layer 24. That is, the tire case 25 is a tire skeleton member forming the skeleton of the pneumatic tire 10.
  • a belt 26 is arranged on the outside of the carcass 16 in the tire radial direction (so-called “outside of the crown portion”), and the belt 26 is in close contact with the outer peripheral surface of the carcass 16.
  • the belt 26 is formed by winding a resin-coated cord 34 having a substantially parallel quadrilateral cross section in which two reinforcing cords 30 are coated with a coating resin 32 in the tire circumferential direction. ing.
  • the fiber 304 used for forming the reinforcing cord 30, the manufacturing method for manufacturing the resin-coated cord 34 including the reinforcing cord 30, and the manufacturing method for the pneumatic tire including the resin-coated cord 34 will be described later.
  • the reinforcing cord 30 of the belt 26 is formed by forming a metal wire 300 made of a plurality of metals and an adhesive resin 310 which is a thermoplastic resin filled between the metal wires 300 and for adhering the metal wires 300. It is formed by including.
  • the coating resin 32 that coats the reinforcing cord 30 a resin material having a higher tensile elastic modulus than the rubber constituting the side rubber layer 24 and the second rubber material constituting the tread 36 described later is used.
  • an elastic thermoplastic resin, a thermoplastic elastomer (TPE), or the like can be used as the coating resin 32 that coats the reinforcing cord 30. Considering the elasticity during running and the moldability during manufacturing, it is desirable to use a thermoplastic elastomer.
  • thermoplastic elastomer examples include polyolefin-based thermoplastic elastomer (TPO), polystyrene-based thermoplastic elastomer (TPS), polyamide-based thermoplastic elastomer (TPA), polyurethane-based thermoplastic elastomer (TPU), and polyester-based thermoplastic elastomer (TPC). , Dynamic cross-linked thermoplastic elastomer (TPV) and the like.
  • TPO polyolefin-based thermoplastic elastomer
  • TPS polystyrene-based thermoplastic elastomer
  • TPA polyamide-based thermoplastic elastomer
  • TPU polyurethane-based thermoplastic elastomer
  • TPC polyester-based thermoplastic elastomer
  • TPV Dynamic cross-linked thermoplastic elastomer
  • thermoplastic resin examples include polyurethane resin, polyolefin resin, vinyl chloride resin, and polyamide resin.
  • the deflection temperature under load (at 0.45 [MPa] load) specified in ISO75-2 or ASTM D648 is 78 [° C] or more, and the tension specified in JIS K7113.
  • the yield strength is 10 [MPa] or more
  • the tensile fracture elongation specified in JIS K7113 is 50% or more
  • deflection temperature (A method) specified in JIS K7206 is 130 [° C] or more. be able to.
  • the tensile elastic modulus (specified in JIS K7113: 1995) of the coating resin 32 that coats the reinforcing cord 30 is preferably 100 [MPa] or more. Further, the upper limit of the tensile elastic modulus of the coating resin 32 covering the reinforcing cord 30 is preferably 1000 [MPa] or less. The tensile elastic modulus of the coating resin 32 that coats the reinforcing cord 30 is particularly preferably in the range of 200 to 700 [MPa]. Further, the in-plane shear rigidity of the belt 26 is preferably equal to or higher than that of the belt formed of the rubber coating.
  • the thickness dimension t of the belt 26 of the present embodiment is preferably larger than the diameter dimension of the reinforcing cord 30, in other words, it is preferable that the reinforcing cord 30 is completely embedded in the coating resin 32.
  • the thickness dimension t of the belt 26 is preferably 0.70 [mm] or more.
  • tread 36 As shown in FIG. 1, a tread 36 made of a second rubber material is arranged outside the belt 26 in the tire radial direction. As the second rubber material used for the tread 36, a conventionally known material is used. A drainage groove 37 is formed in the tread 36. Further, as the pattern of the tread 36, a conventionally known pattern is used.
  • the width BW of the belt 26 measured along the tire width direction is preferably 75% or more of the ground contact width TW of the tread 36 measured along the tire width direction.
  • the upper limit of the width BW of the belt 26 is preferably 110% with respect to the ground contact width TW.
  • the ground contact width TW of the tread 36 means that the pneumatic tire 10 is attached to the standard rim specified in JATMA YEAR BOOK (2019 version, Japan Automobile Tire Association standard), and the applicable size in JATMA YEAR BOOK.
  • the internal pressure is 100% of the air pressure (maximum air pressure) corresponding to the maximum load capacity (internal pressure-load capacity correspondence table in bold) in the ply rating, and the rotation axis becomes parallel to the horizontal flat plate in a stationary state. It is the one when the mass corresponding to the maximum load capacity is added. If the TRA standard or ETRTO standard is applied at the place of use or manufacturing, the respective standards will be followed.
  • the fiber 504 in which a plurality of metal strands 300 (so-called "steel cord”) are twisted as shown in FIG. 8 is used.
  • the diameter of the metal wire 300 is 0.3 [mm] or more and 0.5 [mm].
  • the resin coating cord 534 is manufactured by extrusion molding using the base 510 shown in FIG.
  • the fiber 504 is inserted into the base 510 in the direction of arrow A. Then, the molten resin 312 to be the adhesive resin 310 is filled inside the base 510 from the outer peripheral surface side of the fiber 504 (from the outside) into the inside of the fiber 504.
  • the molten resin 332 to be the coating resin 32 is coated on the fiber 504 inside the base 510, and the fiber 504 is cooled to produce the resin coating cord 534 according to the comparative form.
  • the molten resin 312 to be the adhesive resin 310 is filled between the metal strands 300 from the outer peripheral surface side of the fiber 504.
  • a reinforcing cord 530 in which a plurality of metal strands 300 are bonded by an adhesive resin 310 is formed.
  • the filling pressure of the resin 312 varies, and a hollow portion in which the adhesive resin 310 does not exist may be formed inside the reinforcing cord 530.
  • the plurality of metal wire 300 and the plurality of resin wires 302 formed of the thermoplastic resin, as shown in FIG. 4, are twisted.
  • Fiber 304 is used.
  • the fiber 304 is formed of a plurality of types of strands including the resin strand 302.
  • the outer diameter of the resin wire 302 is smaller than the outer diameter of the metal wire 300, and the number of resin wires 302 is larger than the number of the metal wires 300. ..
  • at least two resin wires 302 are in contact with all the metal wires 300 on the cut surface cut in the direction orthogonal to the longitudinal direction. Then, the resin-coated cord 34 is manufactured by extrusion molding using the base 410 shown in FIG.
  • the fiber 304 is conveyed in the direction of arrow A and the fiber 304 is heated before being inserted into the mouthpiece 410 (heating step).
  • the reinforcing cord 30 including the metal wire 300 and the adhesive resin 310 (see FIG. 7 (A)). Is formed.
  • the reinforcing cord 30 is inserted into the base 410, and the molten resin 332 that becomes the coating resin 32 is coated on the reinforcing cord 30 inside the base 410 (coating step), and this is cooled to form the resin coating cord 34.
  • the adhesive resin 310 is filled between the metal strands 300 by melting the resin strands 302 twisted in advance in the fibers 304. Therefore, as shown in FIG. 7A, the formation of a hollow portion in which the adhesive resin 310 does not exist is suppressed inside the reinforcing cord 30 as compared with the reinforcing cord 530.
  • the adhesive resin 310 and the resin wire 302 are made of a resin that is more difficult for water to permeate than the resin material used for the coating resin 32, in other words, a resin that is harder to absorb water.
  • the adhesive constituting the resin material used for the adhesive resin 310 and the resin wire 302 include a modified olefin resin (modified polyethylene resin, modified polypropylene resin, etc.), polyamide resin, polyurethane resin, and polyester resin. Examples thereof include those containing one or more thermoplastic resins such as resins, modified polyester resins, ethylene-ethyl acrylate copolymers, and ethylene-vinyl acetate copolymers as the main component (main agent).
  • a modified olefin resin, a polyester resin, a modified polyester resin, and an ethylene-ethyl acrylate copolymer from the viewpoint of adhesiveness to the metal member (metal wire 300) and the resin layer (coating resin 32), a modified olefin resin, a polyester resin, a modified polyester resin, and an ethylene-ethyl acrylate copolymer , And a hot melt adhesive containing at least one selected from the group consisting of an ethylene-vinyl acetate copolymer is preferable, and a hot melt adhesive containing at least one selected from a modified olefin resin and a modified polyester resin is more preferable.
  • a hot melt adhesive containing at least one selected from an acid-modified olefin resin (modified olefin resin acid-modified with an unsaturated carboxylic acid) and a modified polyester resin is more preferable, and an acid-modified polyester resin is more preferable.
  • a hot melt adhesive containing is particularly preferable.
  • the "modified olefin resin acid-modified with an unsaturated carboxylic acid” means a modified olefin resin obtained by graft-copolymerizing an unsaturated carboxylic acid with a polyolefin.
  • an unvulcanized unvulcanized outer liner 22 made of a rubber material, a bead core 12, a bead filler 18, a carcass ply 14 whose cord is coated with a rubber material, and a side rubber layer 24 are formed on the outer periphery of a known tire forming drum (not shown).
  • Tire case 25 is formed (see FIG. 1). The manufacturing method up to this point is the same as before.
  • the belt 26 is formed by spirally winding a resin-coated cord 34 having a substantially parallel quadrilateral cross section around a belt forming drum 400 having a circular cross section.
  • the cord supply device 420, the heating device 450, the pressing roller 460, and the cooling roller 470 are movably arranged in the vicinity of the belt forming drum 400.
  • the cord supply device 420 includes a reel 430 around which the resin-coated cord 34 is wound, and a guide member 440 for guiding the resin-coated cord 34 unwound from the reel 430 to the outer periphery of the belt forming drum 400. ing.
  • the guide member 440 has a tubular shape, and the resin coating cord 34 passes through the inside. Further, the resin coating cord 34 is sent out from the mouth portion 440a of the guide member 440 toward the outer peripheral surface of the belt forming drum 400.
  • the heating device 450 blows hot air onto the resin-coated cord 34 to heat and melt the blown portion.
  • the air heated by the heating wire (not shown) is blown out from the outlet 450a by the air flow generated by the fan (not shown), and the blown out hot air is blown to the resin coating cord 34.
  • the configuration of the heating device 450 is not limited to the above configuration, and may be any configuration as long as the thermoplastic resin can be heated and melted.
  • the side surface of the resin coating cord 34 may be brought into contact with a hot iron to heat and melt the side surface, the side surface may be heated and melted by radiant heat, or infrared rays may be irradiated to heat and melt the side surface.
  • the pressing roller 460 presses the resin coating cord 34 against the outer peripheral surface of the belt forming drum 400, and the pressing force F can be adjusted. Further, the roller surface of the pressing roller 460 is processed to prevent the resin material in a molten state from adhering to the roller surface.
  • the pressing roller 460 is rotatable, and when the resin coating cord 34 is pressed against the outer periphery of the belt forming drum 400, the pressing roller 460 is driven to rotate with respect to the belt forming drum 400 rotating in the arrow B direction. It has become.
  • the cooling roller 470 is arranged downstream of the pressing roller 460 in the rotation direction of the belt forming drum 400, and cools the resin coating cord 34 while pressing the resin coating cord 34 against the outer peripheral surface of the belt forming drum 400. Is. Like the pressing roller 460, the cooling roller 470 is processed so that the pressing force can be adjusted and the surface of the roller is prevented from adhering to the molten resin material. Further, the cooling roller 470 is rotatable like the pressing roller 460, and when the resin coating cord 34 is pressed against the outer peripheral surface of the belt forming drum 400, the belt forming drum 400 rotates in the arrow B direction. It is designed to rotate in a driven manner.
  • a liquid for example, water or the like
  • a member for example, resin coating cord 34 in the present embodiment
  • the cooling roller 470 may be omitted.
  • the belt forming drum 400 is rotated in the direction of arrow B, and the resin coating cord 34 is sent out from the mouth portion 440a of the cord supply device 420 toward the outer peripheral surface of the belt forming drum 400.
  • the molten portion of the coating resin 32 comes into contact with the cooling roller 470 and is solidified, and welding of the adjacent resin coating cords 34 is completed.
  • the resin coating cord 34 is spirally wound around the outer peripheral surface of the belt forming drum 400 and pressed against the outer peripheral surface to form the belt 26 on the outer peripheral surface of the belt forming drum 400.
  • the position of the mouth portion 440a of the cord supply device 420 may be moved in the tire width direction with the rotation of the belt forming drum 400, or the belt forming drum 400 may be moved in the tire width direction. You can move it in the direction.
  • the belt 26 in which the coating resin 32 is solidified is removed from the belt forming drum 400, placed outside the tire case 25 (see FIG. 1) in the radial direction, and the tire case 25 is expanded to cover the outer peripheral surface of the tire case 25.
  • the outer peripheral surface of the carcass 16 is crimped to the inner peripheral surface of the belt 26.
  • the unvulcanized tread 36 is attached to the outer peripheral surface of the belt 26 to complete the raw tire.
  • the raw tire produced in this way is vulcanized by a vulcanization molding mold to complete the pneumatic tire 10.
  • the fiber 304 according to the present embodiment includes a plurality of metal wire 300 and a resin wire 302 formed of a plurality of thermoplastic resins. Therefore, as compared with the case where the reinforcing cord 30 is formed by using the fiber 304, the reinforcing cord 530 is formed by filling the inside of the fiber 504 with resin from the outer peripheral surface side of the fiber 504 (from the outside). Therefore, it is possible to suppress the formation of a hollow portion in which the adhesive resin 310 does not exist inside the reinforcing cord 30.
  • the fiber 304 at least two resin wires 302 are in contact with all the metal wires 300 on the cut surface cut in the direction orthogonal to the longitudinal direction. Therefore, as compared with the case where at least two resin wires 302 are not in contact with all the metal wires 300, the molten resin surrounds the metal wires 300, so that the adhesive resin is inside the reinforcing cord 30. It is possible to suppress the formation of a hollow portion in which 310 does not exist.
  • the plurality of metal strands 300 and the plurality of resin strands 302 are in a twisted state. Therefore, it is possible to prevent the metal wire 300 and the resin wire 302 from being separated from each other as compared with the case where they are not twisted.
  • the resin-coated cord 34 is manufactured using the fiber 304. Therefore, it is possible to prevent the formation of a hollow portion in which the adhesive resin 310 does not exist inside the reinforcing cord 30 constituting the resin-coated cord 34 manufactured by the method for manufacturing the resin-coated cord. Thereby, for example, when a repeated load in the tensile direction is applied to the resin coating cord 34, it is possible to prevent peeling from occurring between the metal wire 300 and the adhesive resin 310.
  • the pneumatic tire 10 is manufactured by using the belt 26 formed by the resin-coated cord 34. Therefore, in the tire 10 manufactured by the method for manufacturing a pneumatic tire, it is possible to improve the fatigue durability performance in which a particularly high load is repeatedly applied to the tire 10.
  • the resin wire 302 is melted by heating the fiber 304 (so-called “preheating”) before being inserted into the mouthpiece 410, but the resin wire is inside the mouthpiece 410. 302 may be melted. That is, the heating step and the coating step may be performed inside the base 410.
  • At least two resin wires 302 are in contact with the metal wire 300 on the cut surface cut in the direction orthogonal to the longitudinal direction, but one metal wire is used. At least two resin strands 302 may come into contact with the wire 300. As a result, it is possible to suppress the formation of a hollow portion in which the adhesive resin 310 does not exist inside the reinforcing cord 30, as compared with the case where only one resin wire 302 is in contact with one metal wire 300. Can be done.
  • the plurality of metal wires 300 and the plurality of resin wires 302 are in a twisted state, but they do not have to be twisted. However, in this case, the effect of twisting does not work.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Tires In General (AREA)
  • Ropes Or Cables (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)

Abstract

Une fibre comprend une pluralité de brins métalliques et une pluralité de brins de résine formés à partir d'une résine thermoplastique. En chauffant les fibres, les brins de résine sont fondus et une résine de liaison est formée et lie la pluralité de brins métalliques à la résine fondue.
PCT/JP2020/044558 2019-12-05 2020-11-30 Fibre, procédé de fabrication de câblé revêtu de résine, et procédé de fabrication de pneu Ceased WO2021112049A1 (fr)

Applications Claiming Priority (2)

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JP2019-220529 2019-12-05
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4656410A1 (fr) * 2024-05-27 2025-12-03 Continental Reifen Deutschland GmbH Bandage pneumatique pour véhicule avec renforcement annulaire

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JPS53119356A (en) * 1977-03-25 1978-10-18 Sumitomo Rubber Ind Tyre cord
WO2017222046A1 (fr) * 2016-06-24 2017-12-28 株式会社ブリヂストン Procédé de fabrication d'un pneu
WO2019082939A1 (fr) * 2017-10-25 2019-05-02 株式会社ブリヂストン Pneumatique
JP2019202638A (ja) * 2018-05-23 2019-11-28 株式会社ブリヂストン 空気入りタイヤ

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53119356A (en) * 1977-03-25 1978-10-18 Sumitomo Rubber Ind Tyre cord
WO2017222046A1 (fr) * 2016-06-24 2017-12-28 株式会社ブリヂストン Procédé de fabrication d'un pneu
WO2019082939A1 (fr) * 2017-10-25 2019-05-02 株式会社ブリヂストン Pneumatique
JP2019202638A (ja) * 2018-05-23 2019-11-28 株式会社ブリヂストン 空気入りタイヤ

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4656410A1 (fr) * 2024-05-27 2025-12-03 Continental Reifen Deutschland GmbH Bandage pneumatique pour véhicule avec renforcement annulaire

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