WO2013107570A1 - Steel cord with full elastomer penetration - Google Patents

Steel cord with full elastomer penetration Download PDF

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Publication number
WO2013107570A1
WO2013107570A1 PCT/EP2012/075247 EP2012075247W WO2013107570A1 WO 2013107570 A1 WO2013107570 A1 WO 2013107570A1 EP 2012075247 W EP2012075247 W EP 2012075247W WO 2013107570 A1 WO2013107570 A1 WO 2013107570A1
Authority
WO
WIPO (PCT)
Prior art keywords
steel
steel cord
filaments
group
ple
Prior art date
Application number
PCT/EP2012/075247
Other languages
French (fr)
Inventor
Qinxia ZHANG
Xing Liu
Hongzhen Zhu
Original Assignee
Nv Bekaert 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 Nv Bekaert Sa filed Critical Nv Bekaert Sa
Priority to CN201280066317.4A priority Critical patent/CN104040070B/en
Publication of WO2013107570A1 publication Critical patent/WO2013107570A1/en

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
    • D07B1/0646—Reinforcing cords for rubber or plastic articles comprising longitudinally preformed wires
    • 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
    • D07B1/0646—Reinforcing cords for rubber or plastic articles comprising longitudinally preformed wires
    • D07B1/0653—Reinforcing cords for rubber or plastic articles comprising longitudinally preformed wires in the core
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B1/00—Constructional features of ropes or cables
    • D07B1/06—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
    • D07B1/0626—Reinforcing cords for rubber or plastic articles the reinforcing cords being characterised by the strand configuration the reinforcing cords consisting of three core wires or filaments and at least one layer of outer wires or filaments, i.e. a 3+N 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
    • D07B2201/2015—Strands
    • D07B2201/2024—Strands twisted
    • D07B2201/2029—Open winding
    • D07B2201/2031—Different twist pitch
    • D07B2201/2032—Different twist pitch compared with the 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
    • D07B2201/2047—Cores
    • D07B2201/2052—Cores characterised by their structure
    • D07B2201/2059—Cores characterised by their structure comprising wires
    • D07B2201/206—Cores characterised by their structure comprising wires arranged parallel to the axis
    • 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
    • D07B2201/2061—Cores characterised by their structure comprising wires resulting in a twisted structure
    • 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
    • D07B2401/00—Aspects related to the problem to be solved or advantage
    • D07B2401/20—Aspects related to the problem to be solved or advantage related to ropes or cables
    • D07B2401/2005—Elongation or elasticity
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2401/00—Aspects related to the problem to be solved or advantage
    • D07B2401/20—Aspects related to the problem to be solved or advantage related to ropes or cables
    • D07B2401/2005—Elongation or elasticity
    • D07B2401/201—Elongation or elasticity regarding structural elongation
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2401/00—Aspects related to the problem to be solved or advantage
    • D07B2401/20—Aspects related to the problem to be solved or advantage related to ropes or cables
    • D07B2401/208—Enabling filler penetration
    • 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 invention relates to a steel cord adapted for the reinforcement of
  • elastomers such as rubber conveyor belts, pneumatic tyres, rubber hoses, rubber timing belts or timing belts in polyurethane.
  • the steel cord has an open structure to allow full rubber penetration.
  • WO95/16816A1 discloses a technology to polygonally deform steel filaments without extra energy.
  • WO99/28547A1 discloses a technology to crimp steel filaments in two planes.
  • WO02/088459A1 discloses a steel cord comprising a first group and a second group. The second group is helically twisted around the first group with a cord twisting step. The first group comprises a first number of first steel filaments. The first number ranges between three and eight. The second group comprises a second number of second steel filaments. The second number is equal to or greater than the first number.
  • the first filaments having a twisting step greater than 300mm. At least one of the second filaments is polygonally preformed in order to allow rubber penetration.
  • the primary object of the invention is to provide a steel cord with
  • the second object of the invention is to provide a steel cord with full
  • a product comprising a first group and a second group, the second group being helically twisted around the first group with a cord twisting step, the first group comprising a first number of first steel filaments, the first number ranging between three and eight, the second group comprising a second number of second steel filaments, the second number being equal to or greater than the first number, the first filaments having a twisting step greater than 300mm, both the first steel filaments and the second steel filaments are preformed.
  • the steel cord has a PLE at a tensile tension of 50 Newton between 0.08% and 0.25%.
  • the steel cord has a PLE at a tensile tension of 50 Newton between 0.10% and 0.18%.
  • the second steel filament has a PLE at a tensile tension of 50 Newton between 0.9% and 2.0%, and more preferable between 1 .0% and 1 .2%, while the first steel filament has a PLE at a tensile tension of 50 Newton between 0.4% and 1 .0%, and more preferable between 0.65% and 0.75%.
  • the first number is 4, while the second number is 6.
  • the first steel filaments are preformed into a spatial wavy form, and more preferable the spatial wavy form has a first crimp and a second crimp, while the first crimp lying in a plane that is substantially different from the plane of the second crimp.
  • the second steel filaments are polygonally preformed.
  • Figure 1 describes a first preferred embodiment of the invention.
  • Figure 2 illustrates the tensile tension and elongation curves for steel cords with different PLE.
  • Figure 1 illustrate a steel cord incorporating present invention, wherein steel cord 10 comprises a first group of filaments 12 and a second group of filaments 14.
  • the second group is helically twisted around the first group with a cord twisting step.
  • the first group comprises 4 first steel filaments 12, while the second group comprises 6 second steel filaments 14.
  • the first filaments 12 have a twisting step greater than 300mm. Both the first steel filaments 12 and the second steel filaments 14 are
  • the steel cord has a PLE at a tensile tension of 50 Newton between 0.08% and 0.25%. More preferably, the steel cord has a PLE at a tensile tension of 50 Newton between 0.10% and 0.18%.
  • steel cord is under a tensile tension between 8 Newton and 12 Newton in the calendaring operation, where steel cords are merged into rubber matrix.
  • the steel cord PLE at a tensile tension of 50 Newton should not below 0.08%, because too low PLE means the openings between steel filaments may close under the tensile tension between 8 Newton and 12 Newton in the calendaring operation.
  • steel cord PLE brings better rubber penetration
  • the upper limit for steel cord PLE is around 0.25%.
  • Steel cords are embedded in pneumatic tyres as tensile reinforcement
  • steel cord with PLE bigger than 0.25% means a very open cord, which may firstly cause troubles in the construction of the steel cord because the steel cord is too loose, and secondly cause troubles in tyre making process, for example rough ply or un-even spacing, which will lead to un-uniformity in tyre and destroy dynamic balance of the tyre, and thirdly cannot exert enough strength in a tyre because big PLE means big elongation under tension and steel cord with big PLE cannot exert the same strength as steel cord with small PLE in the same condition.
  • steel cord PLE should between 0.08% and 0.25%, and more preferable between 0.10% and 0.18%.
  • the second steel filament should has a PLE at a tensile tension of 50 Newton between 0.9% and 2.0%, and more preferable between 1 .0% and 1 .2%, while the first steel filament has a PLE at a tensile tension of 50 Newton between 0.4% and 1 .0%, and more preferable between 0.65% and 0.75%.
  • the second steel filament needs bigger PLE than the first steel filament, to make spaces between the second filaments to achieve full rubber penetration.
  • Second filament PLE at 50N 0.9 1 .0 1 .1 1 .2 2.0 (%)
  • FIG. 2 illustrates the tensile tension and elongation curves for steel cords with different PLE, wherein line 22 represents steel cord with PLE 0.08%, 24 for PLE 0.14%, and 26 for PLE 0.25%.
  • the three lines have same gradient because the three steel cords have same E-modulus, while the structural elongation is different because the openness of the steel cord is different. Therefore, line 22, 24, and 26 parallel and offset to each other. Under the same elongation at E, line 22 will exert F2, line 24 F4, and line 26 F6. Hence, steel cord with PLE bigger than 0.25% may not exert enough force for polymer reinforcement.
  • the first steel filament is preformed into a spatial wavy form, and more preferable the spatial wavy form has a first crimp and a second crimp, while the first crimp lying in a plane that is substantially different from the plane of the second crimp. Since the first filaments are inside the cord and not twisted or twisted in a twisting step greater than 300mm, the spatial wavy form on the first steel filaments makes sure that there are always spaces between first steel filaments to achieve full rubber penetration.

Abstract

A steel cord (10) adapted for the reinforcement of elastomers, comprises a first group and a second group, the second group being helically twisted around the first group with a cord twisting step, the first group comprising a first number of first steel filaments (12), the first number ranging between three and eight, the second group comprising a second number of second steel filaments (14), the second number being equal to or greater than the first number, the first filaments having a twisting step greater than 300mm, both the first steel filaments (12) and the second steel filaments (14) being preformed. The steel cord has a PLE at a tensile tension of 50 Newton between 0.08% and 0.25%. This steel cord has measurable deformation to achieve full elastomer penetration, but also maintains the process-ability and functionality for elastomer reinforcement.

Description

Steel cord with full elastomer penetration
Description
Technical Field
[1 ] The invention relates to a steel cord adapted for the reinforcement of
elastomers such as rubber conveyor belts, pneumatic tyres, rubber hoses, rubber timing belts or timing belts in polyurethane. The steel cord has an open structure to allow full rubber penetration.
Background Art
[2] Steel cords with twisted steel filaments are known in the art, particularly in the art of rubber reinforcement, and more particularly in the art of pneumatic tyre reinforcement.
[3] One of the major requirements put upon steel cords is full penetration of the elastomer such as rubber. This means that rubber must be able to penetrate into the cord between the composing elements and fill all possible interstices in order to reduce fretting and tension between the elements and to avoid moisture from travelling along the cord, which would cause a lot of corrosion and which would considerably reduce the life of the cord and the rubber product.
[4] To achieve full rubber penetration, prior arts provide solutions to deform the steel filaments and to construct an open steel cord. WO95/16816A1 discloses a technology to polygonally deform steel filaments without extra energy. WO99/28547A1 discloses a technology to crimp steel filaments in two planes. WO02/088459A1 discloses a steel cord comprising a first group and a second group. The second group is helically twisted around the first group with a cord twisting step. The first group comprises a first number of first steel filaments. The first number ranges between three and eight. The second group comprises a second number of second steel filaments. The second number is equal to or greater than the first number. The first filaments having a twisting step greater than 300mm. At least one of the second filaments is polygonally preformed in order to allow rubber penetration. [5] Although prior arts provide a few ways to make open steel cord and to allow rubber penetration, how much deformation on the steel cord can achieve full rubber penetration is still unknown.
Disclosure of Invention
[6] The primary object of the invention is to provide a steel cord with
measurable deformation to achieve full rubber penetration.
[7] The second object of the invention is to provide a steel cord with full
rubber penetration without weakening the process-ability and functionality of the steel cord for elastomer reinforcement.
[8] According to a first aspect of the invention a product is claimed that a steel cord comprising a first group and a second group, the second group being helically twisted around the first group with a cord twisting step, the first group comprising a first number of first steel filaments, the first number ranging between three and eight, the second group comprising a second number of second steel filaments, the second number being equal to or greater than the first number, the first filaments having a twisting step greater than 300mm, both the first steel filaments and the second steel filaments are preformed. The steel cord has a PLE at a tensile tension of 50 Newton between 0.08% and 0.25%. More preferably, the steel cord has a PLE at a tensile tension of 50 Newton between 0.10% and 0.18%. The second steel filament has a PLE at a tensile tension of 50 Newton between 0.9% and 2.0%, and more preferable between 1 .0% and 1 .2%, while the first steel filament has a PLE at a tensile tension of 50 Newton between 0.4% and 1 .0%, and more preferable between 0.65% and 0.75%. The first number is 4, while the second number is 6. The first steel filaments are preformed into a spatial wavy form, and more preferable the spatial wavy form has a first crimp and a second crimp, while the first crimp lying in a plane that is substantially different from the plane of the second crimp. The second steel filaments are polygonally preformed. Brief Description of Figures in the Drawings
[9] Figure 1 describes a first preferred embodiment of the invention.
[10] Figure 2 illustrates the tensile tension and elongation curves for steel cords with different PLE.
Mode(s) for Carrying Out the Invention
[1 1 ] Figure 1 illustrate a steel cord incorporating present invention, wherein steel cord 10 comprises a first group of filaments 12 and a second group of filaments 14. The second group is helically twisted around the first group with a cord twisting step. The first group comprises 4 first steel filaments 12, while the second group comprises 6 second steel filaments 14. The first filaments 12 have a twisting step greater than 300mm. Both the first steel filaments 12 and the second steel filaments 14 are
preformed. Therefore, there are spaces between the filaments.
[12] To achieve full rubber penetration, the steel cord has a PLE at a tensile tension of 50 Newton between 0.08% and 0.25%. More preferably, the steel cord has a PLE at a tensile tension of 50 Newton between 0.10% and 0.18%. In the tyre making process, steel cord is under a tensile tension between 8 Newton and 12 Newton in the calendaring operation, where steel cords are merged into rubber matrix. To make sure there are always spaces for rubber to penetrate between the filaments, the steel cord PLE at a tensile tension of 50 Newton should not below 0.08%, because too low PLE means the openings between steel filaments may close under the tensile tension between 8 Newton and 12 Newton in the calendaring operation. On the other hand, although bigger steel cord PLE brings better rubber penetration, the upper limit for steel cord PLE is around 0.25%. Steel cords are embedded in pneumatic tyres as tensile reinforcement, while steel cord with PLE bigger than 0.25% means a very open cord, which may firstly cause troubles in the construction of the steel cord because the steel cord is too loose, and secondly cause troubles in tyre making process, for example rough ply or un-even spacing, which will lead to un-uniformity in tyre and destroy dynamic balance of the tyre, and thirdly cannot exert enough strength in a tyre because big PLE means big elongation under tension and steel cord with big PLE cannot exert the same strength as steel cord with small PLE in the same condition.
Therefore, steel cord PLE should between 0.08% and 0.25%, and more preferable between 0.10% and 0.18%.
[13] Based on the similar reasoning, to achieve desired steel cord PLE, there are low and upper limits for the steel filaments. The second steel filament should has a PLE at a tensile tension of 50 Newton between 0.9% and 2.0%, and more preferable between 1 .0% and 1 .2%, while the first steel filament has a PLE at a tensile tension of 50 Newton between 0.4% and 1 .0%, and more preferable between 0.65% and 0.75%. Comparatively, the second steel filament needs bigger PLE than the first steel filament, to make spaces between the second filaments to achieve full rubber penetration.
[14] Contrastive test on 4+6x0.30mm steel cord also confirms above reasoning.
First filament diameter (mm) 0.30 0.30 0.30 0.30 0.30
First filament PLE at 50N (%) 0.4 0.65 0.7 0.75 1 .0
First filament lay length (mm) >300 >300 >300 >300 >300
First filament twisting direction S S S S S
Second filament diameter 0.30 0.30 0.30 0.30 0.30 (mm)
Second filament PLE at 50N 0.9 1 .0 1 .1 1 .2 2.0 (%)
Second filament lay length 18 18 18 18 18 (mm)
Second filament twisting S S s S S direction
Steel cord lay length (mm) 18 18 18 18 18
Steel cord twisting direction S S s S S
Steel cord PLE at 50N (%) 0.08 0.10 0.14 0.18 0.25
Polymer penetration (% loss in 50 5 0 0 0 pressure)
E-modulus (GPa) 175 175 175 175 175 [15] Figure 2 illustrates the tensile tension and elongation curves for steel cords with different PLE, wherein line 22 represents steel cord with PLE 0.08%, 24 for PLE 0.14%, and 26 for PLE 0.25%. The three lines have same gradient because the three steel cords have same E-modulus, while the structural elongation is different because the openness of the steel cord is different. Therefore, line 22, 24, and 26 parallel and offset to each other. Under the same elongation at E, line 22 will exert F2, line 24 F4, and line 26 F6. Hence, steel cord with PLE bigger than 0.25% may not exert enough force for polymer reinforcement.
[16] To compensate the force drop from F2 to F4 because of the increase of PLE, high tensile or super tensile, even ultra tensile steel filaments can be used. In the above contrastive test, high tensile steel filaments, tensile strength higher than 3800-2000xd (filament diameter in mm) MPa, are used to achieve a steel cord E-modulus as high as 175Gpa.
[17] The first steel filament is preformed into a spatial wavy form, and more preferable the spatial wavy form has a first crimp and a second crimp, while the first crimp lying in a plane that is substantially different from the plane of the second crimp. Since the first filaments are inside the cord and not twisted or twisted in a twisting step greater than 300mm, the spatial wavy form on the first steel filaments makes sure that there are always spaces between first steel filaments to achieve full rubber penetration.

Claims

Claims
1. a steel cord (10) comprising a first group and a second group, said second group being helically twisted around said first group with a cord twisting step, said first group comprising a first number of first steel filaments (12), said first number ranging between three and eight, said second group comprising a second number of second steel filaments (14), said second number being equal to or greater than said first number, said first filaments (12) having a twisting step greater than 300mm, both said first steel filaments (12) and said scond steel filaments (14) being preformed, characterized in that said steel cord (10) has a PLE at a tensile tension of 50 Newton between 0.08% and 0.25%.
2. a steel cord according to claim 1 , wherein said steel cord (10) has a PLE at a tensile tension of 50 Newton between 0.10% and 0.18%.
3. a steel cord according to claim 1 , wherein said second steel filament (14) has a PLE at a tensile tension of 50 Newton between 0.9% and 2.0%.
4. a steel cord according to claim 3, wherein said second steel filament (14) has a PLE at a tensile tension of 50 Newton between 1.0% and 1.2%.
5. a steel cord according to claim 1 , wherein said first steel filament (12) has a PLE at a tensile tension of 50 Newton between 0.4% and 1.0%.
6. a steel cord according to claim 5, wherein said first steel filament (12) has a PLE at a tensile tension of 50 Newton between 0.65% and 0.75%.
7. a steel cord according to claim 1 , wherein said first number is 4.
8. a steel cord according to clainn 7, wherein said second number is 6.
9. a steel cord according to claim 1 , wherein said first filament (12) is
preformed into a spatial wavy form.
10. a steel cord according to claim 9, wherein said spatial wavy form has a first crimp and a second crimp, the first crimp lying in a plane that is
substantially different from the plane of the second crimp.
1 1. a steel cord according to claim 1 , wherein said second filament (14) is
polygonally preformed.
PCT/EP2012/075247 2012-01-18 2012-12-12 Steel cord with full elastomer penetration WO2013107570A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201280066317.4A CN104040070B (en) 2012-01-18 2012-12-12 The steel cord of full elastomer penetration

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN2012070520 2012-01-18
CNPCT/CN2012/070520 2012-01-18

Publications (1)

Publication Number Publication Date
WO2013107570A1 true WO2013107570A1 (en) 2013-07-25

Family

ID=47522499

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PCT/EP2012/075247 WO2013107570A1 (en) 2012-01-18 2012-12-12 Steel cord with full elastomer penetration

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WO (1) WO2013107570A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016131862A1 (en) * 2015-02-19 2016-08-25 Compagnie Generale Des Etablissements Michelin Multi-strand cable of 1xn structure for protective reinforcement of a tire

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0533277A (en) * 1991-07-30 1993-02-09 Kanai Hiroyuki Steel cord for reinforcing rubber product
WO1995016816A1 (en) 1993-12-15 1995-06-22 N.V. Bekaert S.A. Open steel cord structure
WO1999028547A1 (en) 1997-11-27 1999-06-10 N.V. Bekaert S.A. Steel cord with waved elements
WO2002088459A1 (en) 2001-04-26 2002-11-07 N.V. Bekaert S.A. Steel cord for reinforcing rubber articles

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0533277A (en) * 1991-07-30 1993-02-09 Kanai Hiroyuki Steel cord for reinforcing rubber product
WO1995016816A1 (en) 1993-12-15 1995-06-22 N.V. Bekaert S.A. Open steel cord structure
WO1999028547A1 (en) 1997-11-27 1999-06-10 N.V. Bekaert S.A. Steel cord with waved elements
WO2002088459A1 (en) 2001-04-26 2002-11-07 N.V. Bekaert S.A. Steel cord for reinforcing rubber articles

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016131862A1 (en) * 2015-02-19 2016-08-25 Compagnie Generale Des Etablissements Michelin Multi-strand cable of 1xn structure for protective reinforcement of a tire
US10704195B2 (en) 2015-02-19 2020-07-07 Compagnie Generale Des Etablissements Michelin Multi-strand cable of 1×N structure for protective reinforcement of a tire

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