WO2012055677A2 - Cordon en acier semi-calmé - Google Patents

Cordon en acier semi-calmé Download PDF

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Publication number
WO2012055677A2
WO2012055677A2 PCT/EP2011/067259 EP2011067259W WO2012055677A2 WO 2012055677 A2 WO2012055677 A2 WO 2012055677A2 EP 2011067259 W EP2011067259 W EP 2011067259W WO 2012055677 A2 WO2012055677 A2 WO 2012055677A2
Authority
WO
WIPO (PCT)
Prior art keywords
steel cord
cord
steel
open
filament
Prior art date
Application number
PCT/EP2011/067259
Other languages
English (en)
Other versions
WO2012055677A3 (fr
Inventor
Zhichao Cheng
Stijn Himpe
Yiwen Luo
Aijun Zhang
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 CN201190000841.2U priority Critical patent/CN203498695U/zh
Publication of WO2012055677A2 publication Critical patent/WO2012055677A2/fr
Publication of WO2012055677A3 publication Critical patent/WO2012055677A3/fr

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
    • 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
    • D07B2201/2024—Strands twisted
    • D07B2201/2029—Open winding
    • 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
    • D07B2201/2039—Strands characterised by the number of wires or filaments three to eight wires or filaments respectively forming a single layer
    • 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
    • D07B2401/208—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 present invention relates to a steel cord, particularly relates to an
  • the present invention also relates to a rubber product reinforced by the steel cord.
  • High elongation (HE) leads to a good anti-impacting or anti-cutting
  • high elongation steel cord is quite required for great anti-impacting or anti-cutting property when, for example, the rubber tire runs over a stone or like.
  • US 5707467 discloses a steel cord with high elongation at break more than 5%.
  • the steel filaments are helically preformed before being twisted into the cord, and the ratio of preforming height and filament diameter is from 1.05 to 2.0.
  • the twisting pitch (lay length) is in the range of 8-15.
  • the elongation under a load of 70N is from 1.18% to 1.57% . Due to the small preforming value, the LLE is not big although the elongation at break is great.
  • Such steel cord can not be provided for reinforcing 0° belt layer in rubber tire. And the figuration of tire reinforced by the steel cord is very bad for its low LLE. Thus the life time of the tire is too short.
  • EP 1344864 also discloses a steel cord comprising coil preformed
  • the LLE under a load of 50N is less than 0.2%.
  • Such steel cord is not suitable for reinforcing 0° belt layer or protecting layer in rubber tire for its poor LLE.
  • US 4938015 discloses an open cord for good penetration of rubber.
  • the open structure is formed by rolling the round steel cord into ellipse. But during the rolling, there will be a strength loss. Although the steel cord has high rubber penetration, the elongation at break of the steel cord is not so high. As a result the anti-impacting or anti-cutting property of rubber product is not good, thus the life time of the rubber product is low. Disclosure of Invention
  • open steel cord with a structure of ⁇ 1 has a high elongation at break being not less than 4%, the open steel cord has a lay length being more than 10 mm, the steel filaments in open steel cord are helically preformed, and the ratio of the preforming height of steel filament and the diameter of steel filament is not less than 5.0.
  • the steel cord has high elongation at break, high low load elongation (LLE) and a very open structure with full rubber penetration.
  • the high LLE and high elongation at break is obtained by preforming the steel filament before being twisted to form open steel cord.
  • the preforming ratio is defined by the ratio of the preforming height of steel filament and the diameter of steel filament.
  • the high preforming ratio leads to high LLE and elongation at break, the higher the preforming ratio, the higher the LLE and elongation at break.
  • the preforming ratio is between 5.0 and 10.0.
  • the preforming ratio is between 5.0 and 8.0.
  • the open HE steel cord has high LLE and is also easy to be manufactured.
  • the preforming length is determined by the desired LLE and determined preforming height.
  • the elongation under break is not less than 4%. Preferably the elongation under break is not less than 4.5%.
  • the elongation of open steel cord under a load of 20 N is not less than 1 .00%, preferably not less than 1 .10%, and smaller than 2.00%.
  • the elongation of open steel cord under a load of 50 N is not less than 1 .50%, preferably not less than 1 .60% , and smaller than 3.00%.
  • the LLE of present invention steel cord is much higher. While using invention steel cord as reinforcing element in rubber tire, the figuration of tire can reach the tire requirement and the life time of the tire is better.
  • US 5707467 discloses a mono-strand HE steel cord comprising preformed filaments and twisted by one step. But the preforming ratio of filament is so small that the LLE is very small. The elongation under a load of 35N is between 0.71 % and 1.00% (of course, the elongation under a load of 20N is smaller than 1.00%), and the elongation under a load of 70N is between 1.18% and 1.57%. They are quite smaller than the LLE of present invention. And the filament in US 5707467 is preformed by zigzag lined rollers which is only available for small performing ratio that big preforming ratio can not be achieved.
  • the steel filament is preformed by a sleeve that the preforming ratio is very big.
  • the open HE steel cord comprising such preformed steel filaments has high LLE.
  • the open steel cord is twisted in one step.
  • the lay length (or twisting pitch) of the open steel cord is more than 10 mm.
  • the bigger the lay length the smaller the elongation at break.
  • the bigger lay length is compensated by the great preforming ratio so that a high elongation at break is obtained.
  • the lay length is between 12mm and 20mm.
  • the lay length relates to the diameter of the steel filament and to the number of the steel filament: It means that the lay length increases with the increasing of the diameter of the steel filament and the lay length increases with an increase in the number of steel filaments.
  • open steel cord has a very open structure.
  • the steel cord will only close while putting under high tension and - since the initial elongation is mainly structural and elastic - the cord will come back to its original state when the tension is removed.
  • Such very open structure will bring a full rubber penetration to the steel cord.
  • both the elongation at break and LLE are high.
  • prior HE cord with multi-strand has high LLE
  • the steel cord is a close cord for its low lay length.
  • the rubber penetration is 0% tested by air drop method while embedding such cord into rubber. This means that the invention steel cord has full rubber penetration which means 100% rubber penetration.
  • the invention cord is more suitable for reinforcing rubber product than prior HE cord with multi-strand.
  • the diameter of the steel filament is between 0.15 and 0.5mm.
  • n is from 2 to 8 preferably. While n is more than 10, to achieve a great effect, the diameter of steel filament decreases with the increasing of the number of steel filaments.
  • the invention steel cord has better rubber penetration and lower production cost, and compared with prior HE cord with mono-strand, the invention steel cord has better LLE.
  • rubber product is 0 degree belt layer or protecting layer in a pneumatic tire.
  • Figure 1 shows the manufacturing process of 6x 1 open HE cord.
  • Figure 2a-2d show the different cross-section views of 6x 1 open HE cord.
  • Figure 3 shows the preforming height of the filament separated from 6x 1 open HE cord.
  • Figure 4 shows the cross-section view of 4x 1 open HE cord.
  • Figure 5 shows the cross-section view of 7x 1 open HE cord.
  • Figure 6 shows the tensile curve of the invention steel cord and prior steel cord.
  • the steel filament may be made from a wire rod.
  • the wire rod composition has a minimum carbon content of 0.70%, a
  • maximum carbon content of about 1.10%, a manganese content ranging from 0.40% to 0.70%, a silicon content ranging from 0.15% to 0.30%, a maximum sulphur content of 0.03%, a maximum phosphorus content of 0.30%, all percentages being percentages by weight.
  • the wire rod is firstly cleaned by mechanical descaling and / or by
  • the wire rod is then rinsed in water and is dried.
  • the dried wire rod is then subjected to a first series of dry drawing operations in order to reduce the diameter until a first intermediate diameter.
  • the dry drawn steel filament is subjected to a first intermediate heat treatment, called patenting.
  • the steel filament is then ready for further mechanical deformation.
  • the steel filament is further dry drawn from the first intermediate diameter until a second intermediate diameter in a second number of diameter reduction steps.
  • the second diameter typically ranges from 1.0 mm to 2.5 mm.
  • the steel filament is subjected to a second patenting treatment to allow for transformation to pearlite.
  • the steel filament is provided with a brass coating: copper is plated on the steel filament and zinc is plated on the copper. A thermo-diffusion treatment is applied to form the brass coating.
  • the steel filament may be provided with an organo functional silane coating upon the brass coating.
  • the final product is a round steel filament with a carbon content above 0.60 percent by weight, with a tensile strength typically above 3800-2000D MPa and adapted for the reinforcement of rubber products.
  • the steel filaments adapted for reinforcing tire typically have a final
  • filament diameter ranging from 0.15 mm to 0.50 mm, e.g. from 0.20 mm to 0.40 mm.
  • filament diameters are 0.20 mm, 0.22 mm, 0.245 mm, 0.28 mm, 0.30 mm, 0.32 mm, 0.35 mm, 0.38 mm, 0.40 mm.
  • the steel filament will be picked up by a spool for the following processes, such as deforming and twisting to form a cord.
  • FIG. 1 shows the manufacturing process of 6x 1 open HE cord.
  • Six steel filaments 10 with a diameter of 0.26mm are guided from the spools 12 to pass through the deforming device sleeves 14. Each steel filament 10 passes over one sleeve 14. Each sleeve causes a plastic bending to the steel filament. However, the steel filaments rotate when passing over the sleeves due to the downstream twisting operation. This bending combined with the rotation and with the linear speed of the steel filaments result in a helical preforming. Thus the steel filaments 10 are helically preformed by sleeves 14. Then the steel filaments 10 are gathered in device 16 wherein the steel filaments are twisted to form a 6x 1 open HE cord 18.
  • any deforming device which can make big deformation known by the person skilled in the art is available.
  • Preferably deforming device is sleeve deforming device.
  • the diameter of sleeve is determined by the desired preforming height of steel filament.
  • the high lay length is obtained.
  • the high preforming ratio of steel filament and high lay length of steel cord lead to HE, high LLE and full rubber penetration of steel cord.
  • Figure 2a to 2d show the different cross-section views of different parts along the length of 6x 1 open HE cord 18.
  • the elongation at break of steel cord 18 is 5.01 %, the elongation under a load of 20 N is 1.33% and the elongation under a load of 50 N is 1.79%.
  • the preforming ratio of the filament 10 is 5.96.
  • the lay length of steel cord 18 is 16mm.
  • the optical diameter of the steel cord 18 is 1.68. The diameter is measured by optical projection at the cross-section of the steel cord. From the diameter, it is very clear that the steel cord is very open that the rubber penetration is very good. And actually the rubber penetration is 100% measured by air drop testing method.
  • the preforming ratio is the ratio of preforming height and diameter of steel filament.
  • the preforming height is measured by optical measuring method. First cut the steel cord into short, then separate the steel filaments into individual filaments from the steel cord, then measure the preforming height by optical measuring method. Always there is a wave form of the steel filament after optical projection. The distance in perpendicular between the highest point of wave form and the lowest point of wave form is preforming height (including two times diameter).
  • Figure 3 shows the preforming height 20 of the filament 10 separated from 6x 1 open HE cord 18.
  • Figure 4 illustrates a 4x 1 open HE cord.
  • the steel cord 22 comprising 4 steel filaments 24 with a diameter of 0.35mm.
  • the elongation at break of steel cord 22 is 5.33%, and the elongation under a load of 20 N is 1.41 % and the elongation under a load of 50 N is 1.67%.
  • the preforming ratio of the filament 24 is 5.54.
  • the lay length of steel cord 22 is 14mm.
  • Figure 5 illustrates a 7x 1 open HE cord.
  • the steel cord 26 comprising
  • the elongation at break of steel cord 26 is 4.75%, and the elongation under a load of 20 N is 1.30% and the elongation under a load of 50 N is 1.53%.
  • the preforming ratio of the filament 28 is 6.07.
  • the lay length of steel cord 26 is 17mm.
  • the steel cord can be 3x 1 , 5x 1 , 8x 1 , 9x 1 and etc.
  • FIG. 7 shows tensile curve, curve 30 is steel cord 18 and curve 32 is steel cord A. From Figure 7, it is clear that the invention cord 18 has the similar strain and stress curve with prior art steel cord A. It shows the invention cord 18 has the similar elongation at break and LLE with prior art steel cord A. But the rubber penetration of invention steel cord 18 is 100%, and the rubber penetration of prior art steel cord A is 0%. Additionally the production cost of invention cord 18 is quite lower than prior art steel cord A, for steel cord 18 is twisted by one step in big lay length wherein the prior art steel cord A should be twisted by two steps at least in very small lay length.
  • Open HE cord with high LLE and full rubber penetration is suitable for reinforcing rubber product, particularly reinforcing 0 degree belt layer or protecting layer in a pneumatic tire.
  • the steel cord has a good fatigue resistance and a long lifetime.
  • the tire also has a long lifetime.

Landscapes

  • Ropes Or Cables (AREA)
  • Tires In General (AREA)

Abstract

Le cordon en acier semi-calmé faisant l'objet de la présente invention possède une structure n×1 et présente un allongement à la rupture élevé qui est supérieur ou égal à 4 % ainsi qu'un pas supérieur à 10 mm. Les filaments en acier dans le cordon en acier semi-calmé sont préformés de manière hélicoïdale, et le rapport entre la taille de préformage du filament en acier et le diamètre dudit filament en acier est supérieur ou égal à 5,0. Le cordon en acier semi-calmé présente un allongement à la rupture élevé, un allongement important sous une faible charge, ainsi qu'une excellente pénétration du caoutchouc. Ledit cordon en acier semi-calmé s'utilise comme élément de renforcement dans un produit en caoutchouc.
PCT/EP2011/067259 2010-10-27 2011-10-04 Cordon en acier semi-calmé WO2012055677A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201190000841.2U CN203498695U (zh) 2010-10-27 2011-10-04 开放式钢帘线

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN2010001707 2010-10-27
CNPCT/CN2010/001707 2010-10-27

Publications (2)

Publication Number Publication Date
WO2012055677A2 true WO2012055677A2 (fr) 2012-05-03
WO2012055677A3 WO2012055677A3 (fr) 2012-06-28

Family

ID=44785839

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2011/067259 WO2012055677A2 (fr) 2010-10-27 2011-10-04 Cordon en acier semi-calmé

Country Status (1)

Country Link
WO (1) WO2012055677A2 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140305566A1 (en) * 2011-09-22 2014-10-16 The Yokohama Rubber Co., Ltd. Pneumatic Tire
WO2016189073A1 (fr) * 2015-05-26 2016-12-01 Compagnie Generale Des Etablissements Michelin Procédé d'assemblage comprenant une étape de préformation
WO2020021006A1 (fr) 2018-07-25 2020-01-30 Compagnie Generale Des Etablissements Michelin Câble ouvert a haute compressibilite
WO2020021007A1 (fr) 2018-07-25 2020-01-30 Compagnie Generale Des Etablissements Michelin Cables metalliques bi-modules
WO2021140287A1 (fr) 2020-01-07 2021-07-15 Compagnie Generale Des Etablissements Michelin Câble multi-torons à une couche à énergie à rupture améliorée et à allongement total amélioré
WO2021140288A1 (fr) 2020-01-07 2021-07-15 Compagnie Generale Des Etablissements Michelin Câble multi-torons à deux couches à énergie à rupture améliorée et à module tangent bas
WO2022064436A1 (fr) * 2020-09-25 2022-03-31 Pirelli Tyre S.P.A. Câble de renfort métallique pour pneus de roues de véhicule et pneu comprenant ledit câble de renfort métallique
WO2023052257A1 (fr) 2021-09-28 2023-04-06 Nv Bekaert Sa Câble d'acier à propriétés d'allongement adaptées

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4938015A (en) 1988-11-11 1990-07-03 Bridgestone Bekaert Steel Cord Co., Ltd. Reinforcing steel cords
US5707467A (en) 1993-12-27 1998-01-13 Tokyo Rope Manufacturing Co., Ltd. Steel cords, radial tire reinforced with same, and apparatus for producing same
EP1344864A2 (fr) 2002-03-13 2003-09-17 Sumitomo Rubber Industries, Ltd. Cable d'acier, procédé pour sa fabrication et pneumatique comportant un tel cable

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07133598A (ja) * 1993-09-14 1995-05-23 Sumitomo Electric Ind Ltd 金属コードの製造方法及び製造装置
JPH0874187A (ja) * 1994-08-31 1996-03-19 Toyo Tire & Rubber Co Ltd スチールコードおよびこれを用いた空気入りタイヤ
JP3887789B2 (ja) * 1997-03-13 2007-02-28 金井 宏彰 タイヤ補強用スチールコード
ZA9810315B (en) * 1997-11-27 1999-05-18 Bekaert Sa Nv Steel cord with spatially waved elements
JP4675738B2 (ja) * 2005-09-30 2011-04-27 金井 宏彰 スチールコードおよび自動車用タイヤ
US20100218872A1 (en) * 2006-01-20 2010-09-02 Bridgestone Corporation Rubber-steel cord composite and tire using the same
US7975463B2 (en) * 2006-05-10 2011-07-12 Pirelli Tyre S.P.A. Metal cord and process for manufacturing a metal cord
JP4848944B2 (ja) * 2006-12-01 2011-12-28 横浜ゴム株式会社 ゴム補強用スチールコード及びそれを用いた空気入りラジアルタイヤ

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4938015A (en) 1988-11-11 1990-07-03 Bridgestone Bekaert Steel Cord Co., Ltd. Reinforcing steel cords
US5707467A (en) 1993-12-27 1998-01-13 Tokyo Rope Manufacturing Co., Ltd. Steel cords, radial tire reinforced with same, and apparatus for producing same
EP1344864A2 (fr) 2002-03-13 2003-09-17 Sumitomo Rubber Industries, Ltd. Cable d'acier, procédé pour sa fabrication et pneumatique comportant un tel cable

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140305566A1 (en) * 2011-09-22 2014-10-16 The Yokohama Rubber Co., Ltd. Pneumatic Tire
US9150052B2 (en) * 2011-09-22 2015-10-06 The Yokohama Rubber Co., Ltd. Pneumatic tire
WO2016189073A1 (fr) * 2015-05-26 2016-12-01 Compagnie Generale Des Etablissements Michelin Procédé d'assemblage comprenant une étape de préformation
WO2020021006A1 (fr) 2018-07-25 2020-01-30 Compagnie Generale Des Etablissements Michelin Câble ouvert a haute compressibilite
WO2020021007A1 (fr) 2018-07-25 2020-01-30 Compagnie Generale Des Etablissements Michelin Cables metalliques bi-modules
US11760128B2 (en) 2018-07-25 2023-09-19 Compagnie Generale Des Etablissements Michelin Highly compressible open cord
WO2021140287A1 (fr) 2020-01-07 2021-07-15 Compagnie Generale Des Etablissements Michelin Câble multi-torons à une couche à énergie à rupture améliorée et à allongement total amélioré
WO2021140288A1 (fr) 2020-01-07 2021-07-15 Compagnie Generale Des Etablissements Michelin Câble multi-torons à deux couches à énergie à rupture améliorée et à module tangent bas
WO2022064436A1 (fr) * 2020-09-25 2022-03-31 Pirelli Tyre S.P.A. Câble de renfort métallique pour pneus de roues de véhicule et pneu comprenant ledit câble de renfort métallique
WO2023052257A1 (fr) 2021-09-28 2023-04-06 Nv Bekaert Sa Câble d'acier à propriétés d'allongement adaptées

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