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WO2025168369A1 - Brin d'acier et courroie renforcée par ledit brin d'acier - Google Patents

Brin d'acier et courroie renforcée par ledit brin d'acier

Info

Publication number
WO2025168369A1
WO2025168369A1 PCT/EP2025/051959 EP2025051959W WO2025168369A1 WO 2025168369 A1 WO2025168369 A1 WO 2025168369A1 EP 2025051959 W EP2025051959 W EP 2025051959W WO 2025168369 A1 WO2025168369 A1 WO 2025168369A1
Authority
WO
WIPO (PCT)
Prior art keywords
steel
filaments
layer
core
strand
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.)
Pending
Application number
PCT/EP2025/051959
Other languages
English (en)
Inventor
Wouter VANREYTEN
Hendrik Rommel
Tom Baekelandt
Manuel LAMPAERT
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 Advanced Cords Aalter NV
Original Assignee
Bekaert Advanced Cords Aalter NV
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 Advanced Cords Aalter NV filed Critical Bekaert Advanced Cords Aalter NV
Publication of WO2025168369A1 publication Critical patent/WO2025168369A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B7/00—Other common features of elevators
    • B66B7/06—Arrangements of ropes or cables
    • B66B7/062—Belts
    • 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
    • D07B1/0633—Reinforcing cords for rubber or plastic articles the reinforcing cords being characterised by the strand configuration having a multiple-layer 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
    • D07B1/0646—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
    • D07B2201/2001—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
    • D07B2201/2024—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
    • D07B2201/2047—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
    • 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
    • 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
    • D07B2501/2007—Elevators

Definitions

  • the invention relates to a steel strand and a belt that is reinforced with such steel strands.
  • the steel strands are designed to reinforce a belt for use in an elevator.
  • the king strand and the outer strands consist of a king wire around which six sheath wires are twisted.
  • Another configuration is 19+8x7 where the king strand comprises a king wire around which first six filaments are twisted, whereon subsequently twelve filaments are twisted in a subsequent operation.
  • the belt behaviour becomes more sensitive to minor differences in strand properties. If some of the strands, or certain lengths in a single strand are stretched during use, the elongation may become permanent. And this acquired elongation results in an uneven, irregularly waved, sometimes curled belt when the load is removed from the belt: the wrinkled belt problem.
  • the used belt Although remaining generally straight - cannot be laid flat on a surface anymore.
  • the main object of the invention is to solve the ‘wrinkled belt’ problem.
  • the origin of the problem is related to the tension members in the belt, also a steel cord construction is proposed that solves this problem.
  • the sum of all angles spanned by the filaments of the second layer with vertex at the centre of the steel strand can also be less than 260°, or even less than 250°. In any case the total sum of angles must be larger 200° as otherwise the second layer barely adds to the breaking load of the strand.
  • the breaking load of the strand is that tensile force (in N) at which the strand catastrophically fails.
  • the first layer filaments can now by contacted by the polymer of the belt (see further), the first layer filaments are also held by the polymer.
  • the number of second layer filaments is preferably ‘N’.
  • a special case of such configuration is called a Seale configuration, wherein the number of second layer filaments is equal to the number of first layer filaments and the steel filaments of the second layer have a diameter such that the second layer is completely closed, or in other words: the total spanning angle of the second layer steel filaments is 360° or at least very close to 360°.
  • At least the core lay length is different than the strand lay length.
  • the lay directions of core and strand may be equal or opposite.
  • the core lay length is smaller than the strand lay length.
  • the lay length of the core is smaller than one third, a fourth, fifth or even a tenth of the strand lay length.
  • the core can simply be two, three, four or five steel filaments that are twisted together. Most preferred is three as this forms a stable configuration.
  • a 12 wire semi-Warrington construction can be envisioned comprising a core-core existing of 3 filaments twisted together.
  • a ‘corecore’ should be interpreted as ‘the core of a core strand’. In the recesses formed by the filaments 3 larger outer filaments are nested. In between each pair of the 3 larger outer filaments a pair of smaller filaments is positioned.
  • An example is given in US 4829760 herewith incorporated in its entirety by reference.
  • Another equally well preferred embodiment is a 9 wire semi-Warrington construction comprising a core-core of 3 fine wires and a jacket of six wires of alternating medium and large size. Such a cord is described in US 3358435.
  • crimped steel filaments In order to impart even more elongation to the core, the use of crimped steel filaments helps.
  • a crimped steel wire shows bends with straight segments in between. With ‘straight’ is meant that the bends have a radius of curvature larger than 100 times the wire diameter.
  • already one crimped steel filaments will have an influence on the extension behaviour of the core. More preferred is that all core steel filaments are crimped.
  • the core is pre-coated with a polymer.
  • this polymer is the same as that of the jacket of the belt.
  • the core polymer is made to enter the gaps between the first layer steel filaments.
  • the polymer forms a resilient cushion in between the first layer steel filaments.
  • the polymer of the core also helps to prevent motion of the first layer steel filaments: it fixes in the steel filaments in position.
  • the steels strand is coated with an organic primer that promotes adhesion between the steel filaments and the polymer.
  • the primer is chosen to improve adhesion to the polymer wherein the reinforcement strand is intended to be used.
  • Typical organic primers are phenolic resin, epoxy, cyanoacrylate, or acrylic based such as for example those marketed under the brand name Loctite®.
  • the organo functional silanes described above are commercially available products. These primers are particularly suited to obtain adhesion with polyurethanes.
  • the organic coating has a thickness of less than 1 micrometer, preferably less than 500 nanometer, such as between 5 and 200 nm. Thin coatings of this size are preferred as they follow the outer surface of the reinforcement strand in a conformal way and do not obstruct the filling of the polymer in the valleys between the outer layer filaments thanks to their thinness. In the case of the inventive strand this is important as the outer surface of the steel strand shows a very curvy surface.
  • substantially round steel wires with a diameter of between 0.02 to 0.40 mm, more preferred between 0.04 and 0.35 mm or between 0.10 and 0.30 are meant. These filaments have a high tensile strength - that is the breaking load (in N) of the filament divided by its cross-sectional area (in mm 2 ) - that is above 2000 N/mm 2 , preferable above 2350 N/mm 2 , for example above 2700 N/mm 2 . An upper limit of tensile strength is currently 4000 N/mm 2 and that for plain carbon steel (see further). [0035] With ‘steel’ any type of steel is meant. Plain carbon steel is preferably used.
  • Such carbon steel filaments can be produced at strengths in excess of 2000 MPa, preferably above 2700 MPa, while now strengths above 3000 MPa are becoming current and inroads are being made for strengths over 3500 MPa.
  • stainless steels contain a minimum of 12 wt% Cr and a substantial amount of nickel. More preferred are austenitic stainless steels, which lend themselves more to cold forming. The most preferred compositions are known in the art as AISI (American Iron and Steel Institute) 302, AISI 301 , AISI 304 and AISI 316 or duplex stainless steels known under EN 1 .4462.
  • a belt is presented.
  • the belt comprises a plurality of steel strands and a polymer jacket, said steel strands being oriented along the length dimension of the belt and held in parallel relationship by the polymer jacket.
  • in parallel relationship it is meant that the steel strands are organised in a single surface, for example a plane surface.
  • the belt differs from prior art belts in that the steel strands are those according the first aspect of the invention.
  • the polymer fills the openings between the second layer filaments, down to the first layer filaments.
  • the polymer jacket is encasing, surrounding, holding the steel strands in position.
  • Practical usable polymers are thermohardening polymers like rubber and thermoplastic polymers, the latter being preferred for their ease of processing and the possibility to easily alter the mechanical properties of the polymer.
  • Most preferred thermoplastic materials are thermoplastic polyurethane (TPU) and thermoplastic polyolefins (TPO).
  • FIG 1 shows a first embodiment of a belt according the invention.
  • FIG 2 shows a first embodiment of the steel strand according the invention.
  • Figure 1 shows a first embodiment of a belt 100 according the invention.
  • the belt comprises steel strands 102 arranged in parallel. Typically from 5 to 15 steel cords can arranged like this in a single belt, but normally 8 to 10 suffice to impart sufficient strength to the belt.
  • the jacket 110 is a poly carbonate polyol based polyurethane. Also indicated in the steel strand 102 is the core 108, the first layer filaments 106 and the second layer filaments 104.
  • the first layer filament 206 has a diameter d1 of 0.31 mm and the second layer filament 204 has a diameter d2 of 0.33.
  • the total angular gap angle in the first layer is then 38.3°.
  • an organofunctional silane adhesive was applied and during drying the polyurethane of the core is molten into the gaps indicated 214. The polyurethane thus fills the gap in between the first layer filaments.
  • the core was not extruded.
  • the first layer filament 306 diameter and the second layer filament 304 diameter was set equal to 0.31 mm.
  • the total angle spanned by second layer filaments was 243° that is below 270°.
  • the circumscribed circle is indicated 312 and has diameter 1.77 mm and thus a perimeter of 5.56 mm.
  • the contacting contour is indicated 314 and has a length of 9.74 mm.
  • the ratio C/TTD is 1 .75.

Landscapes

  • Ropes Or Cables (AREA)

Abstract

L'invention se rapporte à un brin d'acier et une courroie comprenant les brins d'acier. La courroie est particulièrement conçue pour être utilisée comme courroie d'ascenseur. De telles courroies sont très longues et doivent soutenir de nombreux cycles. L'invention résout le problème selon lequel, lors de l'incorporation des brins d'acier dans des courroies, la courroie ne suit pas bien la trajectoire sur une poulie bombée et est ondulée après le retrait de la charge. Ce problème est résolu avec des brins d'acier ayant un noyau, une première couche de filaments d'acier et une seconde couche de filaments, le total des angles couverts par les filaments de la seconde couche avec un sommet au centre des brins étant inférieur à 270°. De cette manière, la surface de contact entre le polymère et le brin d'acier est fortement augmentée par rapport aux brins d'acier de l'état de la technique, ce qui conduit à un meilleur ancrage mécanique et, lorsqu'un adhésif est utilisé, à une force d'adhérence considérablement améliorée.
PCT/EP2025/051959 2024-02-09 2025-01-27 Brin d'acier et courroie renforcée par ledit brin d'acier Pending WO2025168369A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP24156912.8 2024-02-09
EP24156912 2024-02-09

Publications (1)

Publication Number Publication Date
WO2025168369A1 true WO2025168369A1 (fr) 2025-08-14

Family

ID=89900922

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2025/051959 Pending WO2025168369A1 (fr) 2024-02-09 2025-01-27 Brin d'acier et courroie renforcée par ledit brin d'acier

Country Status (2)

Country Link
CN (1) CN120465310A (fr)
WO (1) WO2025168369A1 (fr)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3358435A (en) 1964-11-12 1967-12-19 Trefileries Leon Bekaert Sprl Cord composed of filaments or strands of different diameters
FR2547776A1 (fr) * 1983-06-01 1984-12-28 Toyo Tire & Rubber Co Cable d'acier pour armature de bandage pneumatique
US4829760A (en) 1987-05-04 1989-05-16 N.B. Bekaert S.A. Compact steel cord structure
EP1280958A1 (fr) 2000-05-08 2003-02-05 N.V. Bekaert S.A. Cable d'acier revetu de zinc a resistance a la fatigue amelioree
EP1699973B1 (fr) * 2003-12-24 2007-09-19 Societe de Technologie Michelin Cable metallique a trois couches pour armature de carcasse de pneumatique
WO2010002162A2 (fr) 2008-07-03 2010-01-07 팅크웨어(주) Procédé pour fournir des données de contenus au moyen d'un dispositif de communications sans fil, et dispositif de navigation mettant en oeuvre ledit procédé
WO2012095224A1 (fr) * 2011-01-10 2012-07-19 Nv Bekaert Sa Câble en acier compact
WO2019002162A1 (fr) 2017-06-27 2019-01-03 Bekaert Advanced Cords Aalter Nv Brin de renfort pour renforcer un article polymère

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3358435A (en) 1964-11-12 1967-12-19 Trefileries Leon Bekaert Sprl Cord composed of filaments or strands of different diameters
FR2547776A1 (fr) * 1983-06-01 1984-12-28 Toyo Tire & Rubber Co Cable d'acier pour armature de bandage pneumatique
US4829760A (en) 1987-05-04 1989-05-16 N.B. Bekaert S.A. Compact steel cord structure
EP1280958A1 (fr) 2000-05-08 2003-02-05 N.V. Bekaert S.A. Cable d'acier revetu de zinc a resistance a la fatigue amelioree
EP1699973B1 (fr) * 2003-12-24 2007-09-19 Societe de Technologie Michelin Cable metallique a trois couches pour armature de carcasse de pneumatique
WO2010002162A2 (fr) 2008-07-03 2010-01-07 팅크웨어(주) Procédé pour fournir des données de contenus au moyen d'un dispositif de communications sans fil, et dispositif de navigation mettant en oeuvre ledit procédé
WO2012095224A1 (fr) * 2011-01-10 2012-07-19 Nv Bekaert Sa Câble en acier compact
WO2019002162A1 (fr) 2017-06-27 2019-01-03 Bekaert Advanced Cords Aalter Nv Brin de renfort pour renforcer un article polymère

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