EP1474566A1 - Kompaktes stahlseil - Google Patents

Kompaktes stahlseil

Info

Publication number
EP1474566A1
EP1474566A1 EP02792969A EP02792969A EP1474566A1 EP 1474566 A1 EP1474566 A1 EP 1474566A1 EP 02792969 A EP02792969 A EP 02792969A EP 02792969 A EP02792969 A EP 02792969A EP 1474566 A1 EP1474566 A1 EP 1474566A1
Authority
EP
European Patent Office
Prior art keywords
filaments
diameter
intermediate layer
layer
steel cord
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.)
Granted
Application number
EP02792969A
Other languages
English (en)
French (fr)
Other versions
EP1474566B1 (de
Inventor
Dirk Meersschaut
Johan Pille
Stijn Vanneste
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.)
Bekaert NV SA
Original Assignee
Bekaert NV SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Bekaert NV SA filed Critical Bekaert NV SA
Priority to EP02792969A priority Critical patent/EP1474566B1/de
Publication of EP1474566A1 publication Critical patent/EP1474566A1/de
Application granted granted Critical
Publication of EP1474566B1 publication Critical patent/EP1474566B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • 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
    • D07B2201/2023—Strands with core
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/20—Rope or cable components
    • D07B2201/2015—Strands
    • D07B2201/2024—Strands twisted
    • D07B2201/2025—Strands twisted characterised by a value or range of the pitch parameter given
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/20—Rope or cable components
    • D07B2201/2015—Strands
    • D07B2201/2024—Strands twisted
    • D07B2201/2027—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
    • D07B2201/2015—Strands
    • D07B2201/2038—Strands characterised by the number of wires or filaments
    • D07B2201/204—Strands characterised by the number of wires or filaments nine or more wires or filaments respectively forming 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
    • D07B2201/2047—Cores
    • D07B2201/2051—Cores characterised by a value or range of the dimension given
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2201/00—Ropes or cables
    • D07B2201/20—Rope or cable components
    • D07B2201/2047—Cores
    • D07B2201/2052—Cores characterised by their structure
    • D07B2201/2059—Cores characterised by their structure comprising wires
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2501/00—Application field
    • D07B2501/20—Application field related to ropes or cables
    • D07B2501/2046—Tire cords

Definitions

  • the present invention relates to a steel cord adapted for the reinforcement of elastomer products.
  • the steel cord comprises a core filament with a core filament diameter and layer filaments twisted around the core filament in the same direction and with the same step.
  • 9d/ CC is a compact cord comprising three core filaments with a core filament diameter d c and nine layer filaments with a layer filament diameter d/.
  • the core filament diameter d c is somewhat greater than the layer filament d .
  • 18xd/ 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 d , arranged in an intermediate layer of six filaments and an outer layer of twelve filaments.
  • Such a compact cord is disclosed in EP-B1-0 627 520. Both compact cords constitute stable constructions and may be used to reinforce the carcass plies of medium to heavy truck and bus radial tires.
  • 18xd CC construction with its nineteen filaments is used for the higher breaking loads and a 3xd c
  • the required breaking load is then met by a suitable choice of the filament diameters d c and d;.
  • d c and d By varying the diameters it is technically possible to cover such a broad range of breaking loads so that the carcass plies of practically all current medium and heavy truck and bus radial tires can be reinforced. Although such a broad range is technically possible, it is, however, not always technically desirable. Increasing the filament diameters in order to obtain higher breaking loads results in decreasing values of fatigue resistance. So the filament diameter range has an upper limit due to technical reasons.
  • a steel cord adapted for the reinforcement of elastomer products.
  • the steel cord comprises a core filament with a core filament diameter d c and 3N layer filaments twisted around said 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 intermediate layer filaments and in an outer layer of 2N outer layer filaments.
  • the layer filaments in the intermediate layer have an intermediate layer diameter d,.
  • the core filament diameter d c is smaller than the intermediate layer diameter d ; .
  • This invention cord is a compact cord.
  • the cord has a good fretting behavior, a high breaking load per unit of cross-section and a small diameter.
  • the cord has a symmetric stable construction. It has thirteen to sixteen filaments and fills in the gap between the 3xd c
  • the steel cord is adapted for the reinforcement of elastomer products, which means that it has a steel composition along the following lines : a minimum carbon content of 0.60 % (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 % and a silicon content ranging from 0.10 to 0.90 % ; the sulphur and phosphorous contents are each preferably kept below 0.03 % ; additional elements such as chromium (up to 0.2 a 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.
  • the steel filaments are generally covered with a coating layer to increase the resistance against corrosion or to enhance the adhesion with rubber.
  • This coating may be a chemical primer or may be a metallic coating. The exact type of coating depends upon the eventual application.
  • Corrosion resistant coatings are zinc or a zinc aluminum alloy.
  • Adhesion coatings are brass in the case of rubber, or a so-called ternary brass such as copper-zinc- nickel (e.g. 64% / 35.5% / 0.5%) and copper-zinc-cobalt (e.g. 64% / 35.7% / 0.3%), or a copper-free adhesion layer such as zinc-cobalt or zinc-nickel.
  • the final diameters of the steel filaments range from 0.05 mm to 0.60 mm.
  • the filament diameters preferably range from 0.05 mm to 0.35 mm.
  • 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.
  • the core filament diameter d c is greater than the diameter of a circle tangent to each of the cross-sections of the intermediate layer filaments in the hollow space that remains free when their cross-sections have the highest packing density.
  • all 3N layer filaments i.e. all N intermediate layer filaments and all 2N outer layer filaments have a same intermediate layer filament diameter d,.
  • This first preferable embodiment may be summarized by following formula : 1xd c
  • This first embodiment has the advantage that only two different filament diameters are required.
  • the outer layer of 2N filaments has N filaments facing two intermediate layer filaments with a diameter equal to the intermediate layer diameter d, and has N filaments facing only one intermediate layer filament with a diameter smaller than the intermediate layer diameter d,-.
  • This second embodiment has the advantage of a so-called Warrington construction with a round cross-section.
  • FIGURE 1 is a cross-section of a first embodiment of a steel cord according to the invention
  • FIGURE 2 is an explanatory drawing
  • FIGURE 3 is a cross-section of a second embodiment of a steel cord according to the invention.
  • FIGURE 1 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 d c .
  • Five intermediate layer filaments 14 form an intermediate layer around core filament 12.
  • the intermediate layer filaments have a diameter d ; .
  • Ten outer layer filaments 16 form an outer layer around the intermediate layer.
  • the outer layer filaments 16 also have the same intermediate layer filament diameter d,-. 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.
  • the cross-section has the typical form of a pentagon.
  • the core filament diameter d c is smaller than the intermediate layer filament diameter d ; .
  • the core filament diameter d c is greater than the diameter of a circle 15 tangent to each of the cross-sections of the intermediate layer filaments 16 in the hollow space that remains free when their cross-sections have the highest packing density.
  • a suitable example of a cord according to the first embodiment of the invention is :
  • FIGURE 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.
  • Five intermediate layer filaments 24 with an intermediate layer filament d, have been twisted around the core filament 22.
  • An outer layer of outer layer filaments 26, 28 is formed around the intermediate layer.
  • those five outer layer filaments 26 facing two intermediate layer filaments 24 have a diameter equal to said intermediate layer diameter d,.
  • Five outer layer filaments 28 facing only one intermediate layer filament 24 have a diameter smaller than the intermediate layer diameter d,.
  • the cross-section has a round form.
  • 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 wrapped around the other filaments.
  • the non wrapped version is preferred.
  • non sleeving of the steel cord may be obtained by suitably preforming the outer layer steel filaments so that the outer layer filaments exert a force which is directed radially inward. Such a preforming is disclosed in EP- B1-0 627 520.
  • Table 1 hereunder summarizes some properties measured on steel cords according to the first embodiment of the present invention.
  • PLE or part load elongation expresses the elongation at very small loads below 50 Newton.

Landscapes

  • Ropes Or Cables (AREA)
EP02792969A 2002-02-14 2002-12-03 Kompaktes stahlseil Expired - Lifetime EP1474566B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP02792969A EP1474566B1 (de) 2002-02-14 2002-12-03 Kompaktes stahlseil

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP02100137 2002-02-14
EP02100137 2002-02-14
PCT/EP2002/014077 WO2003069055A1 (en) 2002-02-14 2002-12-03 Compact steel cord
EP02792969A EP1474566B1 (de) 2002-02-14 2002-12-03 Kompaktes stahlseil

Publications (2)

Publication Number Publication Date
EP1474566A1 true EP1474566A1 (de) 2004-11-10
EP1474566B1 EP1474566B1 (de) 2006-07-26

Family

ID=27675738

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02792969A Expired - Lifetime EP1474566B1 (de) 2002-02-14 2002-12-03 Kompaktes stahlseil

Country Status (6)

Country Link
EP (1) EP1474566B1 (de)
AT (1) ATE334251T1 (de)
AU (1) AU2002358672A1 (de)
DE (1) DE60213473T2 (de)
ES (1) ES2269799T3 (de)
WO (1) WO2003069055A1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BRPI0722065A2 (pt) * 2006-12-29 2014-04-01 Bekaert Sa Nv Cordão de aço de arranjo único para reforço de elastômero
CN103298996B8 (zh) * 2011-01-10 2019-12-03 贝卡尔特公司 紧密型钢帘线
BR112013017567B1 (pt) * 2011-01-10 2020-09-01 N.V. Bekaert S.A Cordão de aço compacto

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0627520B1 (de) * 1993-06-02 1998-12-02 N.V. Bekaert S.A. Kompaktes Stahlseil ohne Umhüllungselement
EP0675223A1 (de) * 1994-03-24 1995-10-04 N.V. Bekaert S.A. Mehrlagiges Stahlseil
JP4705302B2 (ja) * 1999-12-30 2011-06-22 ソシエテ ド テクノロジー ミシュラン タイヤカーカス用多層スチールケーブル

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO03069055A1 *

Also Published As

Publication number Publication date
EP1474566B1 (de) 2006-07-26
DE60213473D1 (de) 2006-09-07
ATE334251T1 (de) 2006-08-15
AU2002358672A1 (en) 2003-09-04
ES2269799T3 (es) 2007-04-01
WO2003069055A1 (en) 2003-08-21
DE60213473T2 (de) 2007-03-29

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