WO2012095224A1 - Compact steel cord - Google Patents
Compact steel cord Download PDFInfo
- Publication number
- WO2012095224A1 WO2012095224A1 PCT/EP2011/072074 EP2011072074W WO2012095224A1 WO 2012095224 A1 WO2012095224 A1 WO 2012095224A1 EP 2011072074 W EP2011072074 W EP 2011072074W WO 2012095224 A1 WO2012095224 A1 WO 2012095224A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- diameter
- steel cord
- filaments
- core filament
- intermediate layer
- Prior art date
Links
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
- 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
- D07B2201/20—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
- D07B2201/2024—Strands twisted
- D07B2201/2027—Compact winding
- D07B2201/2028—Compact winding having the same lay direction and lay 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
- D07B2201/2015—Strands
- D07B2201/2036—Strands characterised by the use of different wires or filaments
- D07B2201/2037—Strands characterised by the use of different wires or filaments regarding the dimension of the wires or filaments
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2201/00—Ropes or cables
- D07B2201/20—Rope or cable components
- D07B2201/2047—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
Definitions
- the present invention relates to a steel cord adapted for the reinforcement of elastomer products, especially for reinforcing the carcass plies of medium to heavy truck and bus radial tires.
- the steel cord comprises a core filament with a core filament diameter and two layers of filaments twisted around the core filament in the same direction and with the same step.
- a 1 xdc I 18xdi CC is a compact cord comprising one core filament with a core filament diameter d c and eighteen layer filaments with a layer filament diameter di, arranged in an intermediate layer of six filaments and an outer layer of twelve filaments. Such a compact cord is disclosed in
- the compact cord constitutes a stable construction because the cross-section of such a steel cord has the typical form of regular hexagon which is centrosymmetric and quite stable.
- the 1 *dc I 15*di CC disclosed in WO-A1-03 069 055 comprises a core filament with a core filament diameter and fifteen layer filaments having a layer filament diameter twisted around the core filament.
- the fifteen layer filaments are arranged in an intermediate layer of five filaments and in an outer layer of ten filaments.
- the core filament diameter is smaller than the layer filament diameter.
- Such a compact cord doesn't always constitute a stable construction for the cross-section of the cord has the typical form of regular pentagon which is not centrosymmetric, it would easily lose balance by being disturbed from the twisting machine during the manufacture process. Inversion or kinks would suddenly appear.
- the invention aims at avoiding the disadvantages of the prior art.
- a steel cord adapted for the reinforcement of elastomer products.
- the steel cord comprises a core filament with a core filament diameter Do and 3N layer filaments twisted around the core filament in the same direction and with the same step, N ranges from four to five.
- the 3N layer filaments are arranged in an intermediate layer of N filaments having an intermediate layer diameter Di and in an outer layer of 2N filaments having an outer layer diameter D2, and the steel cord has the following characteristics (Do, Di , D2 in mm ) :
- the invention cord is a compact cord.
- the cord has a good corrosion
- N is preferably equal to five, which means that the steel cord comprises sixteen filaments. Five is preferred to four since five filaments in the intermediate layer fill more the intermediate layer in a stable way.
- This first preferable embodiment may further satisfy following formula:
- the first embodiment further has the advantage that only two different filament diameters are required.
- the core filament diameter Do is smaller than the intermediate layer diameter Di. This second preferable embodiment may further satisfy following formula:
- Figure 1 a andl b andl c are different cross-sections of the steel cord during the constitution in the prior art
- Figure 2 is a cross-section of a first embodiment of a steel cord according to the invention.
- Figure 3 is a cross-section of a second embodiment of a steel cord
- Figure 2 shows a cross-section of a first embodiment of a steel cord 10.
- the steel cord comprises a core filament 12 with a core filament diameter Do.
- Five intermediate layer filaments 14 having an intermediate layer diameter Di form an intermediate layer around core filament 12.
- the diameter Di is equal to the diameter Do.
- Ten outer layer filaments 16 form an outer layer having an outer layer diameter D2 around the intermediate layer. All intermediate layer filaments 14 and all outer layer filaments 16 are twisted in the same twisting direction and with the same twisting step so that a compact configuration is formed. [0017]
- the core filament diameter Do and the outer layer diameter D2 further satisfy the following relationship:
- the steel cord 10 according to the invention was built as follows.
- Starting product is a steel wire rod.
- This steel wire rod has following steel composition: a minimum carbon content of 0.65% (e.g. at least 0.80%, or at least 0.92% with a maximum of 1.2%); a manganese content ranging from 0.20% to 0.90%; a silicon content ranging from 0.15% to 0.90%; a maximum sulphur content of 0.03%; a maximum phosphorus content of 0.30%; additional elements such as chromium (up to 0.2 to 0.4%) , boron, copper, cobalt, nickel, vanadium ... may be added to the composition in order to minimize the amount of deformation needed to obtain a predetermined tensile strength; all percentages being percentages by weight.
- the steel rod is drawn in a number of consecutive steps until the required final diameter.
- the final diameters of the steel filaments range from 0.05 mm to 0.60 mm.
- the filament diameters preferably range from 0.05 to 0.35 mm.
- the drawing steps may be interrupted by one or more heat treatment steps such as patenting.
- the steel filaments are preferably provided with a coating which promotes the adhesion to rubber or with a coating which gives corrosion resistance to the wire.
- a rubber adherable coating is e.g. brass; a corrosion resistant coating is e.g. zinc.
- FIG 3 shows a cross-section of a second embodiment of the steel cord 20 according to the invention.
- the steel cord 20 comprises a core filament 22 with a core filament diameter Do.
- Five intermediate layer filaments 24 with an intermediate layer diameter Di have been twisted around the core filament 22.
- An outer layer of outer layer filaments 26 having an outer layer diameter D2 is formed around the intermediate layer.
- the core filament Do is smaller than the intermediate layer diameter Di and the diameters Dos DK D2 satisfy the following relationships:
- the steel cord can be carried out in various tensile versions, ranging from a normal tensile strength to an ultra high tensile strength.
- the steel cords according to the invention can be manufactured by means of a tubular twisting machine or preferably by means of a double-twisting device.
- Both embodiments may be provided or not with a wrapping filament
- a suitable example of a cord according to the second embodiment of the invention is
- Table 1 hereunder summarizes some properties measured on the steel cord according to the second embodiment of the present invention.
Landscapes
- Ropes Or Cables (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BR112013017567-2A BR112013017567B1 (en) | 2011-01-10 | 2011-12-07 | COMPACT STEEL CORD |
CN201180064594.7A CN103298996B8 (en) | 2011-01-10 | 2011-12-07 | Compact steel cord |
EA201300815A EA024603B9 (en) | 2011-01-10 | 2011-12-07 | Compact steel cord |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2011000042 | 2011-01-10 | ||
CNPCT/CN2011/000042 | 2011-01-10 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2012095224A1 true WO2012095224A1 (en) | 2012-07-19 |
Family
ID=45346459
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2011/072074 WO2012095224A1 (en) | 2011-01-10 | 2011-12-07 | Compact steel cord |
Country Status (3)
Country | Link |
---|---|
BR (1) | BR112013017567B1 (en) |
EA (1) | EA024603B9 (en) |
WO (1) | WO2012095224A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9840808B2 (en) | 2012-02-27 | 2017-12-12 | Gripple Limited | Multiple layer wire strand |
KR20200023399A (en) * | 2017-06-27 | 2020-03-04 | 베카에르트 어드밴스드 코드즈 알테 엔브이 | Reinforcement strands for reinforcement of polymeric articles |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56122814U (en) * | 1980-02-19 | 1981-09-18 | ||
JPH08218281A (en) * | 1995-02-13 | 1996-08-27 | Bridgestone Metalpha Kk | Steel cord for reinforcing rubber article |
EP0627520B1 (en) | 1993-06-02 | 1998-12-02 | N.V. Bekaert S.A. | Compact steel cord with no wrapping filament |
WO2003069055A1 (en) | 2002-02-14 | 2003-08-21 | N.V. Bekaert S.A. | Compact steel cord |
US6863103B1 (en) * | 1999-11-11 | 2005-03-08 | Bridgestone Corporation | Steel cord for the reinforcement of a rubber article and tire |
-
2011
- 2011-12-07 WO PCT/EP2011/072074 patent/WO2012095224A1/en active Application Filing
- 2011-12-07 BR BR112013017567-2A patent/BR112013017567B1/en active IP Right Grant
- 2011-12-07 EA EA201300815A patent/EA024603B9/en not_active IP Right Cessation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56122814U (en) * | 1980-02-19 | 1981-09-18 | ||
EP0627520B1 (en) | 1993-06-02 | 1998-12-02 | N.V. Bekaert S.A. | Compact steel cord with no wrapping filament |
JPH08218281A (en) * | 1995-02-13 | 1996-08-27 | Bridgestone Metalpha Kk | Steel cord for reinforcing rubber article |
US6863103B1 (en) * | 1999-11-11 | 2005-03-08 | Bridgestone Corporation | Steel cord for the reinforcement of a rubber article and tire |
WO2003069055A1 (en) | 2002-02-14 | 2003-08-21 | N.V. Bekaert S.A. | Compact steel cord |
Non-Patent Citations (2)
Title |
---|
ANONYMOUS: "Steel cords of the 1+6+12-type", RESEARCH DISCLOSURE, MASON PUBLICATIONS, HAMPSHIRE, GB, vol. 343, no. 70, 1 November 1992 (1992-11-01), XP007118346, ISSN: 0374-4353 * |
BOURGOIS LUC: "Tire Reinforcement and Tire Performance, ASTM STP", 1979, AMERICAN SOCIETY FOR TESTING AND MATERIALS, article "Survey of Mechanical Properties of Steel Cord and Related Test Methods", pages: 694 |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9840808B2 (en) | 2012-02-27 | 2017-12-12 | Gripple Limited | Multiple layer wire strand |
KR20200023399A (en) * | 2017-06-27 | 2020-03-04 | 베카에르트 어드밴스드 코드즈 알테 엔브이 | Reinforcement strands for reinforcement of polymeric articles |
KR102653649B1 (en) | 2017-06-27 | 2024-04-03 | 베카에르트 어드밴스드 코드즈 알테 엔브이 | Reinforcement strands for reinforcement of polymer articles |
Also Published As
Publication number | Publication date |
---|---|
BR112013017567B1 (en) | 2020-09-01 |
EA024603B1 (en) | 2016-10-31 |
EA024603B9 (en) | 2018-04-30 |
BR112013017567A2 (en) | 2016-10-11 |
EA201300815A1 (en) | 2013-11-29 |
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