EP1167620A1 - Câble d'acier - Google Patents

Câble d'acier Download PDF

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Publication number
EP1167620A1
EP1167620A1 EP00112909A EP00112909A EP1167620A1 EP 1167620 A1 EP1167620 A1 EP 1167620A1 EP 00112909 A EP00112909 A EP 00112909A EP 00112909 A EP00112909 A EP 00112909A EP 1167620 A1 EP1167620 A1 EP 1167620A1
Authority
EP
European Patent Office
Prior art keywords
bundle
filaments
steel cord
flexural strength
single filament
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.)
Withdrawn
Application number
EP00112909A
Other languages
German (de)
English (en)
Inventor
Siegfried Doujak
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.)
Drahtcord Saar GmbH and Co KG
Original Assignee
Drahtcord Saar GmbH and Co KG
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 Drahtcord Saar GmbH and Co KG filed Critical Drahtcord Saar GmbH and Co KG
Priority to EP00112909A priority Critical patent/EP1167620A1/fr
Publication of EP1167620A1 publication Critical patent/EP1167620A1/fr
Withdrawn legal-status Critical Current

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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
    • 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
    • D07B2201/2047—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
    • 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
    • D07B2401/206—Improving radial flexibility

Definitions

  • the present invention relates to a steel cord especially for reinforcing rubber articles, comprising at least one bundle consisting of a plurality of helically shaped filaments and at least one single filament.
  • a steel cord of the above mentioned kind as well as a method of its production are disclosed in WO 97/12091.
  • the filaments of the bundle are helically pre-shaped by means of false twisters.
  • one or several single filaments are wrapped around the bundle.
  • the helical shape is necessary to avoid movement of the filaments out of the steel cord.
  • said object is achieved with a steel cord of the above mentioned kind in which the flexural strength of said at least one bundle amounts to at least fifty percent of the flexural strength of said at least one single filament.
  • said object is achieved with a steel cord of the above mentioned kind in which the flexural strength of said at least one bundle amounts to at most 150 percent of the flexural strength of said at least one single filament.
  • said two embodiments are combined so that the flexural strength of the at least one bundle amounts to at least fifty percent and at most 150 percent of the flexural strength of the at least one filament.
  • the filaments of the bundle need no longer be pre-shaped.
  • the desired helical shape is automatically achieved as soon as the bundle and the at least one single filament are twisted around each other.
  • the flexural strength of a bundle of filaments as well as of a single filament is determined in accordance with "Internationally Agreed Methods for Testing Steel Tire Cords", BISFA, The International Bureau for Standardisation of Man-Made Fibres, 1995 Edition. The disclosure of said document is incorporated by reference. Flexural strength in accordance with said document is determined by bending a bundle or single filament to be tested for a certain angle, typically 15 degrees. The torque required for bending is measured. Next, the flexural strength is determined based on the measured values. The apparatus for determining the flexural strength is referred to as Taber Stiffness Tester, and the flexural strength is accordingly expressed in Taber Stiffness Units (TSU).
  • TSU Taber Stiffness Units
  • n 1
  • the flexural strength of said bundle exceeds the flexural strength of said at least one single filament by at most 35 percent, preferably 25 percent and more preferably 5 to 15 percent.
  • the given values provide sufficient deformation of the bundle when twisting with the at least one single filament during production.
  • the flexural strength of said bundle substantially corresponds to or is slightly lower than the flexural strength of said at least one single filament.
  • the flexural strength of the single filament may be higher than that of the bundle. Accordingly, the bundle will be deformed to a greater extent than the single filament. Therefore, the steel cord in accordance with the invention can be designed to meet the current boundary conditions.
  • the filaments of said bundle feature the same diameter.
  • the steel cord comprises several single filaments featuring the same diameter, too.
  • the diameter of the single filaments is larger than the diameter of the filaments of said bundle in order to provide the required ratio of the respective flexural strength.
  • the use of filaments and single filaments with only one respective diameter allows for simplification of manufacture and storage.
  • said bundle and said at least one single filament are twisted around each other with a variable pitch.
  • the pitch may vary between 6,3 and 25 mm.
  • the properties of the steel cord in accordance with the present invention can be changed by varying the pitch.
  • the desired helical shape of the filaments of said bundle is obtained automatically when twisting said bundle and said at least one single filament.
  • the diameter of the filaments of said bundle and the diameter of said at least one single filament is between 0,15 and 0,40 mm.
  • the filaments of said bundle as well as the single filament may be provided with a coating, especially of brass.
  • another organic, inorganic or metallic coating may be provided which ensures proper adhesion to a surrounding rubber mixture. In many applications the filaments are drawn after the coating.
  • FIGS 1 to 4 show four different embodiments of a steel cord 10 in accordance with the invention in cross section.
  • the steel cord 10 comprises a bundle 11 consisting of a plurality of helically shaped filaments 12 and several single filaments 13.
  • the filaments 12 and the single filaments 13 feature the same respective diameter, the diameter of the single filaments 13 being larger than the diameter of the filaments 12 of the bundle 11.
  • a gap 14 may be formed between the bundle 11 and the single filaments 13.
  • Said gap 14 is advantageously filled with a suitable material not shown in detail in order to prevent corrosion.
  • a suitable material is e. g. disclosed in WO 97/12090 filed by the same applicant.
  • one or more single filaments 13 with a non-circular, preferably flattened cross-section may be used in order to provide openings through which the gap 14 communicates with the environment. When applying rubber to the steel cord 10 said rubber may penetrate through said openings into the gap 14.
  • the filaments 12 are combined in parallel to the bundle 11. It is not necessary to pre-shape said filaments 12.
  • the bundle 11 is twisted with the single filaments 13.
  • the desired helical shape of the filaments 12 of said bundle 11 and of said single filaments 13 is obtained automatically.
  • the required deformation of the filaments 12 of said bundle 11 during twisting is ensured by the ratio of the flexural strengths of the bundle 11 and each single filament 13 in accordance with the invention.
  • Figures 1 to 4 depict the diameters cited in the above table approximately in the scale 5:1.
  • the flexural strength of the bundle 11 exceeds the flexural strength of each single filament 13 by approximately 42 percent.
  • the flexural strength of the bundle 11 is slightly lower than the flexural strength of each single filament 13.
  • Figure 3 shows a steel cord 10 in which the flexural strength of the bundle 11 exceeds the flexural strength of each single filament 13 by approximately 14 percent.
  • the flexural strength of the bundle 11 substantially corresponds to the flexural strength of each single filament 13.
  • the ratio of the flexural strengths of the bundle 11 and each single filament may approximately be calculated by means of the formula cited at the beginning of the specification.
  • the number of filaments 12 of the bundle 11 and the ratio of diameters d 1 /d 2 may be calculated for each desired ratio of flexural strengths. With a lower value of 50 percent and an upper value of 150 percent for said ratio, it results: 0,5 ⁇ n * d 1 d 2 4 ⁇ 1,5 which may be transformed to: 4 0,5 n ⁇ d 1 d 2 ⁇ 4 1,5 n n may only be a whole number.
  • n d 1 /d 2 for values of n running from 2 to 5 and the above mentioned range from 0,5 to 1,5 for the ratio of the flexural strengths: n d 1 /d 2 2 0,707 - 0,930 3 0,639 - 0,841 4 0,595 - 0,783 5 0,562 - 0,740
  • the ratio of diameters d 1 /d 2 and/or the number n of filaments 12 of bundle 11 may be calculated from the above formulas.
  • the ratio of the flexural strengths may, accordingly, be set as desired.
  • FIG. 5 shows a schematic side view of a further embodiment of a steel cord 10 in accordance with the invention.
  • the bundle 11 consists of four filaments 12. There is provided only one, comparatively thick filaments 13.
  • the filaments 12 are combined in parallel to the bundle 11 and subsequently twisted with the single filament 13 with a pitch S. Said twisting automatically provides the desired helical shape of the bundle 11 and its filaments 12 as well as of the single filament 13.
  • the pitch S may vary between 6,3 and 25 mm.
  • the steel cord 10 in accordance with the invention allows the use of filaments 12 without pre-shaping due to the special ratio of the flexural strengths.
  • the previously required step of pre-shaping may be omitted.

Landscapes

  • Ropes Or Cables (AREA)
  • Tires In General (AREA)
EP00112909A 2000-06-19 2000-06-19 Câble d'acier Withdrawn EP1167620A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP00112909A EP1167620A1 (fr) 2000-06-19 2000-06-19 Câble d'acier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP00112909A EP1167620A1 (fr) 2000-06-19 2000-06-19 Câble d'acier

Publications (1)

Publication Number Publication Date
EP1167620A1 true EP1167620A1 (fr) 2002-01-02

Family

ID=8169011

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00112909A Withdrawn EP1167620A1 (fr) 2000-06-19 2000-06-19 Câble d'acier

Country Status (1)

Country Link
EP (1) EP1167620A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7487928B2 (en) 2004-02-10 2009-02-10 Magotteaux International S.A. Grinding balls and their manufacturing method

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4022009A (en) * 1975-05-12 1977-05-10 Akzo N.V. Metallic cable
US4506500A (en) * 1982-04-10 1985-03-26 Tokusen Kogyo Kabushiki Kaisha Steel cord for reinforcing a rubber structure
US4545190A (en) * 1983-09-26 1985-10-08 The Goodyear Tire & Rubber Company Metallic cable and method and apparatus for making same
WO1997012091A1 (fr) * 1995-09-25 1997-04-03 Drahtcord Saar Gmbh & Co. Kg Procede de fabrication d'un cable d'acier

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4022009A (en) * 1975-05-12 1977-05-10 Akzo N.V. Metallic cable
US4506500A (en) * 1982-04-10 1985-03-26 Tokusen Kogyo Kabushiki Kaisha Steel cord for reinforcing a rubber structure
US4545190A (en) * 1983-09-26 1985-10-08 The Goodyear Tire & Rubber Company Metallic cable and method and apparatus for making same
WO1997012091A1 (fr) * 1995-09-25 1997-04-03 Drahtcord Saar Gmbh & Co. Kg Procede de fabrication d'un cable d'acier

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7487928B2 (en) 2004-02-10 2009-02-10 Magotteaux International S.A. Grinding balls and their manufacturing method

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