# US 10,309,041 B2 · Steel cord and method of manufacturing rubber product

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- Number: US 10,309,041 B2
- Document ID: US10309041B2
- Status: Granted
- Kind: B2
- Application number: 14/783,742
- Filed: 2014-04-03
- Published: 2016-07-14
- Granted: 2019-06-04
- Earliest claimed: 2013-04-11
- Assignees: The Yokohama Rubber Co., Ltd.
- Applicants: The Yokohama Rubber Co., LTD.
- Inventors: Ryotaro Suefuji
- Web page: https://patentgrep.com/patent/US10309041B2

## CPC

- D02G 3/48: Tyre cords {(tyre reinforcements B60C9/00; metal cords for reinforcing rubber or plastic articles D07B1/0606)}
- B29C 48/154: Coating solid articles, i.e. non-hollow articles
- B29C 71/02: Thermal after-treatment {(B29C71/0063 and B29C71/0072 take precedence)}
- B60C 9/0007: {Reinforcements made of metallic elements, e.g. cords, yarns, filaments or fibres made from metal}
- D07B 1/0613: {the reinforcing cords being characterised by the rope configuration}
- D07B 1/062: {the reinforcing cords being characterised by the strand configuration}
- B29K 2009/06: SB polymers, i.e. butadiene-styrene polymers
- B29K 2305/12: Iron
- B29L 2031/7092: {Conveyor belts}
- D07B 1/0686: {characterised by the core design}
- D07B 2201/2052: characterised by their structure
- D07B 2201/2061: resulting in a twisted structure
- D07B 2201/2074: in radial direction
- D07B 2501/2046: Tyre cords
- D02G: CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- B60C: VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- D07B: ROPES OR CABLES IN GENERAL (joining ropes or cables to one another or to other objects B65H69/00, F16G11/00; {mountaineering ropes A63B29/02}; mechanical finishing or dressing of ropes D02J; {braiding D04C}; decorative ropes or cords D04D; suspension cables for bridges E01D19/16; specially adapted for driving, or for being driven by, pulleys or other gearing elements F16G9/00; electric cables or joints insofar as electrical aspects are essential H01B, H01R)
- B29K: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR {MOULDS, } REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29L: INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES

## Abstract

A steel cord has a stranded structure comprising a plurality of sheath strands intertwined around the outer circumferential surface of a core strand; and a filament having a linear mass density of at least 560 dtex and not more than 2,200 dtex wrapped in a spiral around the outer circumferential surface of the core strand. The steel cord is embedded in an unvulcanized rubber member to mold a molded rubber article, which is then vulcanized.

## Claims

### Claim 1

A stranded steel cord comprising a plurality of sheath strands intertwined around an outer circumferential surface of a core strand, the cord being characterized in that an intertwined cord having a linear mass density of at least 1401 dtex and not more than 2,200 dtex is wrapped in a spiral around the outer circumferential surface of the core strand, wherein the intertwined cord comprises a plurality of intertwined filaments, and a wrapping pitch of the intertwined cord is at least ⅕ a cord pitch and not more than five times the cord pitch, the cord pitch being the pitch of the sheath strands intertwined around the core strand.

### Claim 2 (depends on 1)

The steel cord according to claim 1, wherein only the intertwined cord is Resorcinol Formaldehyde Latex dip-treated.

### Claim 3 (depends on 2)

The steel cord according to claim 2, wherein the intertwined cord is wrapped in a direction opposite a twist direction of the core strand.

### Claim 4 (depends on 3)

A method of manufacturing a rubber product, the method comprising the steps of: molding a molded rubber article by embedding the steel cord described in claim 3 in an unvulcanized rubber member; and vulcanizing the molded rubber article.

### Claim 5 (depends on 4)

The method of manufacturing a rubber product according to claim 4, wherein the rubber product is a conveyor belt, and the steel cord is embedded in the unvulcanized rubber member as a core.

### Claim 6 (depends on 2)

A method of manufacturing a rubber product, the method comprising the steps of: molding a molded rubber article by embedding the steel cord described in claim 2 in an unvulcanized rubber member; and vulcanizing the molded rubber article.

### Claim 7 (depends on 6)

The method of manufacturing a rubber product according to claim 6, wherein the rubber product is a conveyor belt, and the steel cord is embedded in the unvulcanized rubber member as a core.

### Claim 8 (depends on 1)

The steel cord according to claim 1, wherein the intertwined cord is wrapped in a direction opposite a twist direction of the core strand.

### Claim 9 (depends on 8)

A method of manufacturing a rubber product, the method comprising the steps of: molding a molded rubber article by embedding the steel cord described in claim 8 in an unvulcanized rubber member; and vulcanizing the molded rubber article.

### Claim 10 (depends on 9)

The method of manufacturing a rubber product according to claim 9, wherein the rubber product is a conveyor belt, and the steel cord is embedded in the unvulcanized rubber member as a core.

### Claim 11 (depends on 1)

The steel cord according to claim 1, wherein the sheath and core strands each comprise a plurality of metal filaments and an outer diameter of each of the metal filaments is at least 0.2 mm and not more than 1.0 mm.

### Claim 12 (depends on 1)

A method of manufacturing a rubber product, the method comprising the steps of: molding a molded rubber article by embedding the steel cord described in claim 1 in an unvulcanized rubber member; and vulcanizing the molded rubber article.

### Claim 13 (depends on 12)

The method of manufacturing a rubber product according to claim 12, wherein the rubber product is a conveyor belt, and the steel cord is embedded in the unvulcanized rubber member as a core.