EP0635597A1 - Stahlseilkonstruktion - Google Patents

Stahlseilkonstruktion Download PDF

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Publication number
EP0635597A1
EP0635597A1 EP94202020A EP94202020A EP0635597A1 EP 0635597 A1 EP0635597 A1 EP 0635597A1 EP 94202020 A EP94202020 A EP 94202020A EP 94202020 A EP94202020 A EP 94202020A EP 0635597 A1 EP0635597 A1 EP 0635597A1
Authority
EP
European Patent Office
Prior art keywords
filaments
steel
steel cord
cord
core
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.)
Ceased
Application number
EP94202020A
Other languages
English (en)
French (fr)
Inventor
Xavier De Vos
Frans Van Giel
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 EP94202020A priority Critical patent/EP0635597A1/de
Publication of EP0635597A1 publication Critical patent/EP0635597A1/de
Ceased legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B5/00—Making ropes or cables from special materials or of particular form
    • D07B5/12—Making ropes or cables from special materials or of particular form of low twist or low tension by processes comprising setting or straightening treatments
    • 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
    • D07B7/00—Details of, or auxiliary devices incorporated in, rope- or cable-making machines; Auxiliary apparatus associated with such machines
    • D07B7/02—Machine details; Auxiliary devices
    • D07B7/022—Measuring or adjusting the lay or torque in the rope
    • 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
    • D07B2201/2047—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
    • D07B2205/00—Rope or cable materials
    • D07B2205/30—Inorganic materials
    • D07B2205/3021—Metals
    • D07B2205/3025—Steel
    • D07B2205/3046—Steel characterised by the carbon content
    • D07B2205/3057—Steel characterised by the carbon content having a high carbon content, e.g. greater than 0,8 percent respectively SHT or UHT wires
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2207/00—Rope or cable making machines
    • D07B2207/20—Type of machine
    • D07B2207/204—Double twist winding
    • D07B2207/206—Double twist winding with means for providing less than double twist, e.g. counter rotating means
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2207/00—Rope or cable making machines
    • D07B2207/40—Machine components
    • D07B2207/4072—Means for mechanically reducing serpentining or mechanically killing of rope
    • 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
    • D07B2401/2015—Killing or avoiding twist

Definitions

  • the present invention relates to a steel cord adapted for the reinforcement of elastomers such as rubber or plastic products.
  • elastomers reinforced by means of steel cords are conveyor belts, timing belts, rubber hoses and radial tyres where the carcass plies and/or the breaker plies can comprise steel cords.
  • a steel cord adapted for the reinforcement of elastomers.
  • a steel cord 'adapted for the reinforcement of elastomers' means that the steel cord has the proper features to reinforce elastomers such as rubber tyres, conveyor belts, hoses and timing belts. This means particularly, either alone or in combination, that :
  • the steel cord of the present invention comprises individual steel filaments. Some of these steel filaments have a difference in torsion saturation level in comparison with other of these steel filaments. All of the individual steel filaments have a predetermined number of residual torsions per filament, e.g. no residual torsions per filament, or in another embodiment where the cord consists of a core of one or more core filaments and a layer of layer filaments, residual torsions of the core filament which tend to open the cord and residual torsions of the layer filaments which tend to close the cord.
  • the inventors have discovered that it was not sufficient that the steel cord, taken as a whole, was free of residual torsions in order to avoid processability problems, but that it was necessary to control the residual torsions of the individual steel filaments in order to further enhance the processability and to obtain reinforced elastomeric plies with a sufficient flatness.
  • the 'number of residual torsions' is herein defined as the number of revolutions made by a specific length of cord or filament (conveniently 6 meter) when one end is held in a fixed position and the other end is allowed to turn freely. It is conveniently expressed in turns per six meters.
  • the individual steel filaments have been twisted individually around their longitudinal axes, which means that the steel cord has been manufactured by means of a double-twister or single-twister.
  • Individual filaments which have been twisted around their longitudinal axes can be distinguished from filaments which have not been twisted around their longitudinal axes by the inspection of the drawing lines which are a secondary result of the necessarily imperfect final wet drawing steps : these drawing lines form a helicoid in case the filaments have been twisted around their longitudinal axes and are substantially parallel to their longitudinal axes in case the filaments have not been twisted around their longitudinal axes.
  • the torsion saturation level of an individual steel filament is dependent upon : the material of the steel filament, and, especially, upon the diameter of the steel filament and upon the tensile strength of the steel filament.
  • the inventors have discovered that the reason why control of the number of residual torsions of the global steel cord was not sufficient to obtain the required processability was due to a difference in torsion saturation level of individual steel filaments and that it was necessary to take care of this difference.
  • steel cords according to the invention are wrapless compact cords, i.e. cords having filaments which all have the same twist pitch and the same twist direction and having no wrapping filament, and where some of the filaments have a filament diameter or a filament tensile strength or both which is different from the filament diameter or the filament tensile strength of the other filaments in the cord.
  • This difference in filament diameter and/or filament tensile strength results in a difference in torsion saturation level between the individual steel filaments of the cord.
  • Some specific examples are : - 1 x 0.20
  • Figure 1 shows the cross-section of a 1 + 6 -cord 10 according to the prior art.
  • the cord 10 has one core filament 12 and six layer filaments 14 surrounding and contacting the core filament 12.
  • the steel cord has been twisted into the Z-direction.
  • the steel cord 10 taken as a whole, is free of residual torsions, the individual steel filaments have residual torsions : the layer filaments 14 have residual torsions in the S-direction while the core filament has residual torsions in the Z-direction.
  • Figure 2 shows an end of an elastomeric ply reinforced with a steel cord according to the prior art.
  • the ends of the filaments, and particularly the end of the core filament start to rotate in case the elastomeric material 16 has not completely filled up the interstices between the core filament 12 and the layer filaments 14.
  • the layer filaments 14 no longer contact the core filament at the place of cutting.
  • disadvantages are the result.
  • the steel cord 10 has a larger diameter than designed.
  • the interstices between the filaments 12, 14 have become much greater allowing moisture to penetrate more easily into the cord.
  • the elastomeric ply no longer has its desired flatness over its complete surface, which results in a worse processability.
  • Figure 3 shows an end of an elastomeric ply reinforced with steel cord 10 according to the present invention.
  • the individual steel filaments 12, 14 are free from residual torsions.
  • the individual steel filaments 12, 14 do not rotate and contact between the core filament 12 and the layer filaments 14 is maintained.
  • the diameter of the cord 10 does not increase, the interstices between the filaments 12, 14 do not increase and the elastomeric ply remains flat.
  • Figure 4 illustrates schematically the way of manufacturing a steel cord 10 according to the present invention.
  • the core filament 12 and the layer filaments 14 are drawn from the supply spools 18 on the left side of the Figure and are led to a distributing disc 20 and to a cord forming die 22 where the cord 10 is at least partially formed.
  • the thus formed cord 10 is further guided over a guiding pulley 24, a rotating flyer 25 and over a reversing pulley 26.
  • the cord 10 has reached its final twist pitch.
  • the cord 10 is now further overtwisted by means of a first false twister 28, i.e. twisted to a twist pitch smaller than the final twist pitch of the cord 10 and untwisted until the final twist pitch of the cord 10.
  • the cord 10 is untwisted by means of a second false twister 30, i.e. untwisted to a twist pitch greater than the twist pitch of the cord 10 and twisted again to the final twist pitch of the cord 10. Finally, the cord 10 is wound on spool 32.
  • a second false twister 30 i.e. untwisted to a twist pitch greater than the twist pitch of the cord 10 and twisted again to the final twist pitch of the cord 10.
  • Figure 5 shows torsion diagrams of steel filaments of a 1 x 0.20 + 6 x 0.175 -cord according to the prior art manufactured in the convenient way, i.e. by making use of one single false twister in order to make the steel cord as a whole free of residual torsions.
  • the abscissa (horizontal axis) n a is the number of applied torsions
  • the ordinate (vertical axis) n r is the number of residual torsions.
  • the torsion curve of the core filament 12 is designated by 34
  • the torsion curve of the layer filaments 14 is designated by 36. While being twisted by means of a double-twister to the final twist pitch, core filament 12 follows curve OA, while layer filaments 14 follow curve OA' to a higher level of residual torsions, since the torsion saturation level of a layer filament 14 with a diameter of 0.175 mm is higher than for a core filament 12 with a diameter of 0.20 mm.
  • the number of torsions n LL applied by means of the double-twister corresponds to the final twist pitch.
  • a false twister the only one
  • the cord 10 is further overtwisted to a number n FT1 of applied torsions.
  • the core filament 12 follows curve AB while the layer filaments follow curve A'B'. Subsequently the cord is untwisted to the same number n FT1 of torsions in order to reach again the final twist pitch of the cord.
  • Core filament 12 follows curve BC resulting finally in residual torsions which tend to close the cord.
  • Layer filaments 14 follow curve B'C' resulting in residual torsions which tend to open the cord.
  • Figure 6 shows torsion diagrams of steel filaments of a 1 x 0.20 + 6 x 0.175 -cord according to the present invention manufactured in the way illustrated in Figure 4, i.e. by making use of two false twisters in order to make not only the steel cord as a whole free of residual torsions but also the individual steel filaments.
  • the first false twister 28 has a rotation speed which is higher than the rotation speed of the only false twister of Figure 5, which means that the number n FT1 of torsions applied by the first false twister is higher than in the case of Figure 5.
  • Core filament 12 follows curve ABC and layer filaments 14 follow curves A'B'C' while being false twisted in the first false twister 28.
  • a second false twister 30 untwists the cord 10 to a number n FT2 of applied torsions and again twists the cord 10 to its predetermined final twist pitch.
  • the revolution speed of the second false twister 30, and hence the number n FT2 of applied torsions, are so chosen that they correspond always to the point where both torsions curves 34 and 36 cross each other.
  • Core filament 12 follows curve CDE while layer filaments 14 follow curve C'DE, resulting in a steel cord consisting only of filaments which are free of residual torsions.
  • both false twisters 28 and 30 must be so tuned that the point where the both torsion curves 34 and 36 cross each other is such that it is reached after the untwisting stage of the second false twister 30 and that the twisting of the second false twister results in zero residual torsions on both kind of filaments. Too low a revolution speed of the first false twister 28 will result in residual torsions on the filaments which will open the steel cord 10, too high a revolution speed of the first false twister will result in residual torsions on the filaments which will close the steel cord 10.

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  • Ropes Or Cables (AREA)
EP94202020A 1993-07-20 1994-07-12 Stahlseilkonstruktion Ceased EP0635597A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP94202020A EP0635597A1 (de) 1993-07-20 1994-07-12 Stahlseilkonstruktion

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP93202122 1993-07-20
EP93202122 1993-07-20
EP94202020A EP0635597A1 (de) 1993-07-20 1994-07-12 Stahlseilkonstruktion

Publications (1)

Publication Number Publication Date
EP0635597A1 true EP0635597A1 (de) 1995-01-25

Family

ID=26133923

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94202020A Ceased EP0635597A1 (de) 1993-07-20 1994-07-12 Stahlseilkonstruktion

Country Status (1)

Country Link
EP (1) EP0635597A1 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997012092A1 (de) * 1995-09-25 1997-04-03 Drahtcord Saar Gmbh & Co. Kg Drahtfilament, insbesondere zur verstärkung von gummi- oder kunststoffartikeln, verfahren zu dessen herstellung und vorrichtung zum durchführen des verfahrens
WO1998013546A1 (de) * 1996-09-23 1998-04-02 Drahtcord Saar Gmbh & Co. Kg Stahlcord und verfahren zu dessen herstellung
FR2943691A1 (fr) * 2009-03-31 2010-10-01 Michelin Soc Tech Procede et dispositif de fabrication d'un cable a trois couches du type gomme in situ
FR2943690A1 (fr) * 2009-03-31 2010-10-01 Michelin Soc Tech Procede et dispositif de fabrication d'un cable a trois couches du type gomme un situ
WO2015169521A1 (en) * 2014-05-08 2015-11-12 Nv Bekaert Sa Steel cord with reduced residual torsions
WO2022135850A1 (en) * 2020-12-21 2022-06-30 Nv Bekaert Sa A steel cord for rubber reinforcement

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0143767A1 (de) * 1983-09-02 1985-06-05 N.V. Bekaert S.A. Seil aus Stahldrähten für Kautschukerzeugnisse
EP0387803A1 (de) * 1989-03-15 1990-09-19 Sumitomo Electric Industries, Ltd. Stahlkabel zur Verstärkung von Gummi

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0143767A1 (de) * 1983-09-02 1985-06-05 N.V. Bekaert S.A. Seil aus Stahldrähten für Kautschukerzeugnisse
EP0387803A1 (de) * 1989-03-15 1990-09-19 Sumitomo Electric Industries, Ltd. Stahlkabel zur Verstärkung von Gummi

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997012092A1 (de) * 1995-09-25 1997-04-03 Drahtcord Saar Gmbh & Co. Kg Drahtfilament, insbesondere zur verstärkung von gummi- oder kunststoffartikeln, verfahren zu dessen herstellung und vorrichtung zum durchführen des verfahrens
US6151879A (en) * 1995-09-25 2000-11-28 Drahtcord Saar Gmbh & Co. Kg Wire filament, especially for reinforcing rubber of plastic items, process for its production and device for implementing the process
CN1079863C (zh) * 1995-09-25 2002-02-27 德拉特科德萨尔股份有限两合公司 螺旋形钢丝和生产这种钢丝的方法及实施该方法的装置
WO1998013546A1 (de) * 1996-09-23 1998-04-02 Drahtcord Saar Gmbh & Co. Kg Stahlcord und verfahren zu dessen herstellung
WO2010112445A1 (fr) * 2009-03-31 2010-10-07 Societe De Technologie Michelin Procede et dispositif de fabrication d' un cable a trois couches
FR2943690A1 (fr) * 2009-03-31 2010-10-01 Michelin Soc Tech Procede et dispositif de fabrication d'un cable a trois couches du type gomme un situ
FR2943691A1 (fr) * 2009-03-31 2010-10-01 Michelin Soc Tech Procede et dispositif de fabrication d'un cable a trois couches du type gomme in situ
WO2010112444A1 (fr) * 2009-03-31 2010-10-07 Societe De Technologie Michelin Procede et dispositif de fabrication d' un cable a trois couches
US8720176B2 (en) 2009-03-31 2014-05-13 Michelin Recherche Et Technique S.A. Method and device for producing a three-layer cord
US8720177B2 (en) 2009-03-31 2014-05-13 Michelin Recherche Et Technique S.A. Method and device for producing a three-layer cord
WO2015169521A1 (en) * 2014-05-08 2015-11-12 Nv Bekaert Sa Steel cord with reduced residual torsions
EA031220B1 (ru) * 2014-05-08 2018-12-28 Нв Бекаэрт Са Стальной корд с уменьшенным остаточным напряжением кручения
US10487448B2 (en) 2014-05-08 2019-11-26 Nv Bekaert Sa Steel cord with reduced residual torsions
WO2022135850A1 (en) * 2020-12-21 2022-06-30 Nv Bekaert Sa A steel cord for rubber reinforcement

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