WO2021008853A1 - Câble en acier destiné au renforcement de caoutchouc - Google Patents

Câble en acier destiné au renforcement de caoutchouc Download PDF

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Publication number
WO2021008853A1
WO2021008853A1 PCT/EP2020/067887 EP2020067887W WO2021008853A1 WO 2021008853 A1 WO2021008853 A1 WO 2021008853A1 EP 2020067887 W EP2020067887 W EP 2020067887W WO 2021008853 A1 WO2021008853 A1 WO 2021008853A1
Authority
WO
WIPO (PCT)
Prior art keywords
steel
filament
core
steel filament
steel cord
Prior art date
Application number
PCT/EP2020/067887
Other languages
English (en)
Inventor
Haidong XI
Ming Xu
Jing Yang
Zhigao YU
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
Publication of WO2021008853A1 publication Critical patent/WO2021008853A1/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
    • D07B1/062—Reinforcing cords for rubber or plastic articles the reinforcing cords being characterised by the strand configuration
    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
    • D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
    • D02G3/44—Yarns or threads characterised by the purpose for which they are designed
    • D02G3/48—Tyre cords
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
    • B60C9/0007—Reinforcements made of metallic elements, e.g. cords, yarns, filaments or fibres made from metal
    • D—TEXTILES; PAPER
    • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
    • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
    • D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
    • D02G3/02—Yarns or threads characterised by the material or by the materials from which they are made
    • D02G3/12—Threads containing metallic filaments or strips
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
    • B60C9/18—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers
    • B60C9/20—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel
    • B60C2009/2074—Physical properties or dimension of the belt cord
    • B60C2009/2077—Diameters of the cords; Linear density thereof
    • 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
    • D07B2201/00—Ropes or cables
    • D07B2201/20—Rope or cable components
    • D07B2201/2001—Wires or filaments
    • D07B2201/2002—Wires or filaments characterised by their cross-sectional shape
    • D07B2201/2003—Wires or filaments characterised by their cross-sectional shape flat
    • 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
    • D07B2201/2048—Cores characterised by their cross-sectional shape
    • 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
    • D07B2205/3085—Alloys, i.e. non ferrous
    • D07B2205/3089—Brass, i.e. copper (Cu) and zinc (Zn) alloys

Definitions

  • the invention relates to a steel cord for rubber reinforcement.
  • invention also relates to a tire reinforced by the steel cord.
  • the at least two steel filaments are twisted together to form a steel cord.
  • a type of steel cord with a construction of 1 +n is widely used.
  • the core steel filament is made to have a diameter bigger than the sheath steel filament, such as the steel cord in CN205000184.
  • this steel cord suffers from the tip rise problem during the tire making process.
  • a rubber ply which is embedded with steel cords in parallel is one component for tire making.
  • the rubberized steel cord ply is further processed by being cut into small pieces with a certain length, width and thickness.
  • the rubberized steel cord ply is being cut with an angle oblique with the longitudinal axis of the rubberized steel cord ply or being cut perpendicularly to the longitudinal axis of the rubberized steel cord ply. Subsequently, the small pieces of rubber ply, all with the same shape are spliced to a desired length for one tire by machine.
  • the primary object of the invention is to provide a steel cord to solve the problems mentioned above and in particular the tip rise problem.
  • the second object of the invention is to provide a tire reinforced by the invention steel cord.
  • a steel cord comprises one core steel filament and sheath steel filaments with a number of n, the core steel filament is untwisted and the sheath steel filaments are twisted around said core steel filament, the core steel filament is substantially linear along its longitudinal direction, the core steel filament is a flattened filament with the cross section having an aspect ratio of width to thickness being in the range of 1.08 to 1.90.
  • substantially round cross-section “substantially round cross-section” means the cross-section is not a perfect round shape because of the nature of the production, wherein the ratio of width to thickness of the filament is about 1 with minor and acceptable difference which is due to production tolerances.
  • the core steel filament is a flattened filament, i.e. the cross section in a plane perpendicular to the length dimension of the core steel filament shows two flat faces that are substantially parallel to one another, the surfaces of the core steel filament for connecting the two flat faces could be curved surfaces.
  • the perpendicular distance between two parallel lines tangent to the cross section of the wire is the ‘calliper distance’ as it corresponds to the distance between the anvils of a calliper when touching the core steel filament.
  • Width and thickness of the core steel filament are conveniently measured by micro calliper, the measurement method is as follows: first the steel cord is unravelled and the core steel filament identified; then the maximum calliper distance and the minimum calliper distance at a first place of the core steel filament is determined with micro calliper by turning the core steel filament over all angles and repeatedly measuring the distance; next, at a second and third place the same measurement is performed. The first, second and third place are sufficiently far from one another for example at least one lay length of the sheath steel filaments apart.
  • the average value of the three maximum calliper distances is the width of the core steel filament, and the average value of the three minimum calliper distances is the thickness of the core steel filament.
  • the ratio of the width to the thickness of the core steel filament is in the range of 1.08 to 1.90 and will be called‘aspect ratio’.
  • the sheath steel filaments have a round or substantially round cross- section.
  • the core steel filament is untwisted, this means that the core steel filament is almost straight without twisting, or the twist pitch of the core steel filament is more than 250mm or infinite.
  • “untwisted” does not mean that the steel filament is not subjected to any twisting process; an untwisted steel filament could be a steel filament firstly being subjected to twisting and then being subjected to un-twisting.
  • there is no other preforming on the core steel filament so that along the longitudinal direction the core steel filament is substantially linear or straight,“’substantially linear along the longitudinal direction of the core steel filament” means the core steel filament is not in a wavy or spiral form but in a linear or straight form with minor deviation caused by the production.
  • the aspect ratio of width to thickness of the core steel filament is in the range of 1.12-1.55. More preferably the aspect ratio of the core steel filament is in the range of 1.15-1.50. This reduces the tip rise problem of the steel cord in rubber ply very much.
  • the steel cord is not as flat as the core steel filament.
  • the steel cord has an aspect ratio of width to thickness being in the range of 1.0-1.1.
  • the measurement method of the width and thickness of the steel cord is almost the same as the measurement method of the width and the thickness of the core steel filament, just replacing the core steel filament by the steel cord.
  • the core steel filament has an equivalent diameter bigger than the
  • the equivalent diameter of the core steel filament is the diameter of an imaginary circle that has the same area as the perpendicular cross section of the core steel filament, wherein the area of the core steel filament is determined by dividing the core steel filament linear density by the steel density.
  • equivalent diameter of the core steel filament is bigger than the sheath steel filament diameter with a difference of at least 0.03mm, preferably the equivalent diameter difference is at most 0.08mm, for example 0.05 or 0.06mm. This can have better improvement on tip raise problem.
  • the core steel filament has an equivalent diameter in the range of 0.25mm-0.50mm.
  • the width of the core steel filament is bigger than the equivalent diameter of the core steel filament.
  • the width of the core steel filament is smaller than or equal to 0.55mm. If the width of the core steel filament is too big, it will be difficult to control the cord formation quality.
  • the thickness of the core steel filament is smaller than the equivalent diameter of the core steel filament.
  • the thickness of the core steel filament is at least 0.25mm. If the thickness of the core steel filament is too small, the tire reinforced by the steel cord may have a smaller stiffness in the radial direction that leads to a worse tread wear and bigger rolling resistance.
  • the core steel filament is a flattened filament, the stiffness in width is bigger than the stiffness in thickness. The different stiffness in different direction leads to better handling comfort and turning handling of the tire.
  • the steel cord can be any one of the existing 1 +n construction steel cord.
  • n is 5, 6 or 7.
  • the steel cord has a twist pitch in the range of 10 to 20mm, preferably in the range of 12 to 18mm.
  • a tire comprising the belt layer, the carcass layer, the tread layer and a pair of bead portions, the belt layer and/or the carcass layer is embedded with at least one steel cord comprising one core steel filament and sheath steel filaments with a number of n, the core steel filament is untwisted and the sheath steel filaments are twisted around said core steel filament, the core steel filament is substantially linear along the longitudinal direction of the core steel filament, the core steel filament is a flattened filament with an aspect ratio of width to thickness being in the range of 1.08 to 1.90.
  • Figure 1 describes a first preferred embodiment of the invention.
  • Figure 2 describes the flattened core steel filament of the first embodiment
  • Figure 3 describes a prior art with a construction of 1 +6.
  • Figure 5 describes a second preferred embodiment of the invention.
  • the steel filaments for steel cord are made from a wire rod.
  • 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.
  • Patenting means first austenitizing until a temperature of about 1000 °C followed by a transformation phase from austenite to pearlite at a temperature of about 600 - 650 °C. The steel filament is then ready for further mechanical deformation.
  • the steel filament is further dry drawn from the first intermediate diameter Di until a second intermediate diameter D2 in a second number of diameter reduction steps.
  • the second diameter D2 typically ranges from 1.0 mm to 2.5 mm.
  • the steel filament is subjected to a second patenting treatment, i.e. austenitizing again at a temperature of about 1000 °C and thereafter quenching at a temperature of 600 to 650 °C to allow for transformation to pearlite.
  • a second patenting treatment i.e. austenitizing again at a temperature of about 1000 °C and thereafter quenching at a temperature of 600 to 650 °C to allow for transformation to pearlite.
  • the steel filament is usually 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 can be provided with a ternary alloy coating, including copper, zinc and a third alloy of cobalt, titanium, nickel, iron or other known metal.
  • the final product is a steel filament with a carbon content above 0.60 per cent by weight, e.g. higher than 0.70 per cent by weight, or higher than 0.80 per cent by weight, or even higher than 0.90 per cent by weight, with a tensile strength typically above 2000 MPa, e.g. above 3800-2000xD (HT) MPa, or above 4100-2000xD MPa (ST) or above 4400-2000xD (UT) MPa (D is the diameter of the final steel filament) and adapted for the reinforcement of elastomer products.
  • HT 3800-2000xD
  • ST 4100-2000xD MPa
  • UT 4400-2000xD
  • Steel filaments adapted for the reinforcement of tyres typically have a final diameter ranging from 0.05 mm to 0.60 mm, e.g. from 0.10 mm to 0.40 mm.
  • Examples of wire diameters are 0.10 mm, 0.12 mm, 0.15 mm, 0.175 mm, 0.18 mm, 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 diameter the steel filament is in the range of 0.25mm-0.50mm.
  • one steel filaments as a core steel filament and n steel filaments as sheath steel filaments are prepared for further so-called cabling or bunching process to form a steel cord.
  • the steel filament for core steel filament is flattened (with a cross-section in flat shape) by passing through a group of rollers to have an aspect ratio of width to thickness being in the range of 1.08 to 1.90 before the sheath steel filaments are twisted around it, while the steel filaments for sheath steel filaments are not flattened (with a round cross-section).
  • the sheath steel filaments are twisted around the core steel filament by so-called cabling or bunching process, then a steel cord with a construction of 1 +n is obtained, wherein the core steel filament being untwisted and substantially linear and said sheath steel filaments being twisted around said core steel filament, the core steel filament has a cross-section in flat shape with an aspect ratio of width to thickness being in the range of 1.08 to 1.90.
  • the sheath steel filaments could be pre-formed or without
  • Preforming means the steel filament is preformed in a certain manner, so that the steel filament has a two-dimensional or three-dimensional form, for example wavy or spiral, regularly or repeatedly presenting along the length of the steel filament. Preforming could be any one of existing preforming, such as crimping by a pair of gears, polygonal preforming described in W095/16816, double crimping described in W099/2854 or preforming described in US4258543 or KR100635328.
  • the core steel filament is only flattened without any preforming, and this means there is no other above-mentioned preforming on the core steel filament, so that the core steel filament is substantially linear but not in a wavy or spiral form along the longitudinal direction of the core steel filament.
  • Figure 1 shows the first embodiment with a construction of 1 +6.
  • the steel cord 100 has one core steel filament 105 with flat cross-section and 6 sheath steel filaments 100 with round cross-section.
  • the core steel filament 105 is un-twisted and is linear along its longitudinal direction.
  • Figure 2 shows the cross-section of the core steel filament 105.
  • Figure 3 shows the prior art steel cord with a construction of 1 +6.
  • steel cord 300 has one core steel filament 305 with round cross-section and 6 sheath steel filaments 300 with round cross-section.
  • Figure 4 shows the measurement of tip rise value.
  • the small piece 400 cut from a rubber ply which is embedded with steel cords 100 has a
  • the value T measured from the thickness direction of the small piece 400 is the tip rise value.
  • Air Drop test method has the similar working principle with the Air permeability method described in US2012227885, the differences are: first, the specimen with steel cord in rubber has a length being 90% of lay length of steel cord and with a minimum of 8.0mm; second, for the invention air drop method the air pressure DR showing in the display is the result when the testing time is 60 seconds.
  • the DR result of“100” in the display is recorded as“0%” which means full rubber penetration of the sample steel cord
  • the DR result of“0” in the display is recorded as“100%” which means no rubber penetration
  • the DR result of “60” in the display is recorded as“40%” which means 60% rubber penetration.
  • FIG. 5 shows the second embodiment of 1 +5.
  • the steel cord 500 has one core steel filament 505 and five sheath steel filaments 510.
  • the core steel filament 505 is un-twisted and is linear along its longitudinal direction
  • the core steel filament 505 has a flat cross-section with an aspect ratio of

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Ropes Or Cables (AREA)
  • Tires In General (AREA)

Abstract

L'invention concerne un câble en acier comprenant un filament d'âme en acier et des filaments de gaine en acier au nombre de n, le filament d'âme en acier étant non torsadé et les filaments de gaine en acier étant torsadés autour du filament d'âme en acier, le filament d'âme en acier étant sensiblement linéaire le long de sa direction longitudinale, le filament d'âme en acier étant un filament aplati ayant un rapport d'aspect entre largeur et épaisseur au niveau de sa section transversale dans la plage de 1,08 à 1,90. Le câble en acier, selon l'invention, présente un problème de relèvement de bout réduit lorsqu'il est intégré dans la nappe de caoutchouc en vue de la fabrication de pneumatiques.
PCT/EP2020/067887 2019-07-17 2020-06-25 Câble en acier destiné au renforcement de caoutchouc WO2021008853A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN2019096414 2019-07-17
CNPCT/CN2019/096414 2019-07-17

Publications (1)

Publication Number Publication Date
WO2021008853A1 true WO2021008853A1 (fr) 2021-01-21

Family

ID=71409384

Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Status (2)

Country Link
CN (2) CN212713929U (fr)
WO (1) WO2021008853A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023285075A1 (fr) * 2021-07-13 2023-01-19 Nv Bekaert Sa Câble d'acier pour renforcement de caoutchouc
EP4263933A1 (fr) * 2020-12-21 2023-10-25 NV Bekaert SA Câble d'acier pour renforcement de caoutchouc
WO2024046634A1 (fr) * 2022-08-31 2024-03-07 Nv Bekaert Sa Procédé de détection de la hauteur de l'extrémité ou de l'ondulation du bord d'une couche de caoutchouc et dispositif

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021008853A1 (fr) * 2019-07-17 2021-01-21 Nv Bekaert Sa Câble en acier destiné au renforcement de caoutchouc
CN113969511A (zh) * 2021-11-16 2022-01-25 山东大业股份有限公司 一种高渗胶密集型钢帘线

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4258543A (en) 1978-10-31 1981-03-31 Industrie Pirelli S.P.A. Metal cord
EP0264071A2 (fr) * 1986-10-16 1988-04-20 Akzo N.V. Bandage pneumatique ayant des câblés plats
WO1995016816A1 (fr) 1993-12-15 1995-06-22 N.V. Bekaert S.A. Structure ouverte pour cable metallique
WO1999002854A1 (fr) 1997-07-07 1999-01-21 Poclain Hydraulics Industrie Moteur hydraulique a frein compact
KR100635328B1 (ko) 2005-11-14 2006-10-18 주식회사 효성 고강도 스틸코드 및 그의 제조방법
WO2011029679A1 (fr) * 2009-09-11 2011-03-17 Nv Bekaert Sa Câble d'acier ovale constitué de fils ovales
US20120227885A1 (en) 2009-11-27 2012-09-13 Nv Bekaert Sa Open multi-strand cord
WO2014166673A1 (fr) * 2013-04-10 2014-10-16 Nv Bekaert Sa Câble en acier plat doté d'un cœur en zinc ou en alliage de zinc
CN205000184U (zh) 2015-09-30 2016-01-27 贝卡尔特公司 一种用于增强橡胶制品的钢帘线

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8624529D0 (en) * 1986-10-13 1986-11-19 Bekaert Sa Nv Flat cord for tyres
JP4043092B2 (ja) * 1998-03-31 2008-02-06 横浜ゴム株式会社 重荷重用空気入りラジアルタイヤ
KR100293558B1 (ko) * 1999-06-07 2001-06-15 최의박 고무보강용 스틸코드
KR100359656B1 (ko) * 2000-07-12 2002-11-04 금호산업 주식회사 트럭 및 버스용 래디얼 타이어의 벨트보강용 스틸코드 및이를 이용한 타이어
WO2021008853A1 (fr) * 2019-07-17 2021-01-21 Nv Bekaert Sa Câble en acier destiné au renforcement de caoutchouc

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4258543A (en) 1978-10-31 1981-03-31 Industrie Pirelli S.P.A. Metal cord
EP0264071A2 (fr) * 1986-10-16 1988-04-20 Akzo N.V. Bandage pneumatique ayant des câblés plats
WO1995016816A1 (fr) 1993-12-15 1995-06-22 N.V. Bekaert S.A. Structure ouverte pour cable metallique
WO1999002854A1 (fr) 1997-07-07 1999-01-21 Poclain Hydraulics Industrie Moteur hydraulique a frein compact
KR100635328B1 (ko) 2005-11-14 2006-10-18 주식회사 효성 고강도 스틸코드 및 그의 제조방법
WO2011029679A1 (fr) * 2009-09-11 2011-03-17 Nv Bekaert Sa Câble d'acier ovale constitué de fils ovales
US20120227885A1 (en) 2009-11-27 2012-09-13 Nv Bekaert Sa Open multi-strand cord
WO2014166673A1 (fr) * 2013-04-10 2014-10-16 Nv Bekaert Sa Câble en acier plat doté d'un cœur en zinc ou en alliage de zinc
CN205000184U (zh) 2015-09-30 2016-01-27 贝卡尔特公司 一种用于增强橡胶制品的钢帘线

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4263933A1 (fr) * 2020-12-21 2023-10-25 NV Bekaert SA Câble d'acier pour renforcement de caoutchouc
WO2023285075A1 (fr) * 2021-07-13 2023-01-19 Nv Bekaert Sa Câble d'acier pour renforcement de caoutchouc
WO2024046634A1 (fr) * 2022-08-31 2024-03-07 Nv Bekaert Sa Procédé de détection de la hauteur de l'extrémité ou de l'ondulation du bord d'une couche de caoutchouc et dispositif

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CN212713929U (zh) 2021-03-16
CN112239907A (zh) 2021-01-19

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