WO2001010656A1 - Metallic cord for reinforcing rubber articles, in particular tyres - Google Patents
Metallic cord for reinforcing rubber articles, in particular tyres Download PDFInfo
- Publication number
- WO2001010656A1 WO2001010656A1 PCT/EP2000/006882 EP0006882W WO0110656A1 WO 2001010656 A1 WO2001010656 A1 WO 2001010656A1 EP 0006882 W EP0006882 W EP 0006882W WO 0110656 A1 WO0110656 A1 WO 0110656A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- wires
- cord
- cords
- crown
- core wires
- Prior art date
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
- 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
-
- 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
- B60C9/2003—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel characterised by the materials of the belt cords
- B60C9/2006—Structure or arrangement of belts or breakers, crown-reinforcing or cushioning layers built-up from rubberised plies each having all cords arranged substantially parallel characterised by the materials of the belt cords consisting of steel cord plies only
-
- 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
-
- 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
- D07B1/064—Reinforcing cords for rubber or plastic articles the reinforcing cords being characterised by the strand configuration the reinforcing cords being twisted and with at least one wire exchanging place with another wire
-
- 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
- D07B2201/2023—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
- D07B2201/2015—Strands
- D07B2201/2024—Strands twisted
- D07B2201/2029—Open winding
- D07B2201/2031—Different twist pitch
- D07B2201/2032—Different twist pitch compared with the core
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T152/00—Resilient tires and wheels
- Y10T152/10—Tires, resilient
- Y10T152/10495—Pneumatic tire or inner tube
- Y10T152/10765—Characterized by belt or breaker structure
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T152/00—Resilient tires and wheels
- Y10T152/10—Tires, resilient
- Y10T152/10495—Pneumatic tire or inner tube
- Y10T152/10765—Characterized by belt or breaker structure
- Y10T152/1081—Breaker or belt characterized by the chemical composition or physical properties of elastomer or the like
Definitions
- the present invention relates to a metallic cord for reinforcing rubber articles, in particular tyres.
- the metallic cord to which the invention refers is of the type comprising three internal wires forming a core configuration and six external wires forming a crown configuration around them.
- cords are used as a metallic reinforcing element in rubber articles, and for this purpose are enclosed in an elastomeric matrix to create a ply.
- plies to which the invention refers form the reinforcing layers of tyres.
- a tyre comprises a toroidal carcass formed by at least one reinforcing ply anchored to a pair of bead wires, a tread band and a belt layer between the carcass and the tread band.
- Said belt layer may comprise at least two layers of rubber enclosing metallic cords of the type described above, where the cords of one layer are crossed with respect to those of the adjacent layer and relatively to the equatorial plane of the tyre.
- a steel cord with three core wires and six crown wires is, for example, described m the patent US-5, 609, 014.
- This cord has a "1 x 9" structure which is obtained by simultaneously unwinding nine wires from nine different bobbins and feeding said wires first to a preforming device and then to a twisting machine. In a final phase this cord is subjected to deformation by compression so as to assume a substantially elliptical shape.
- the core wires of the cord according to patent US- 5,609,014 are all of equal diameter, just as the six crown wires the diameter of which, however, is larger than the diameter of the core wires.
- the crown wires are of a diameter 1.5 to 2 times greater than that of the core wires.
- all the wires have a diameter which does not exceed 0.5 mm and preferably is comprised between 0.15 mm and 0.38 mm.
- a cord is described m which the core wires have a diameter equal to 0.2 mm and the crown wires have a diameter equal to 0.35 mm.
- the twist pitch, equal for the core and the crown wires, is preferably between 10 mm and 20 mm.
- the cord according to patent US-5,609,014 is compared with a conventional cord of the "3 + 6" type formed of three core wires and six crown wires, the former wound together and the latter wound round the former in a manufacturing cycle comprising two different phases: a first phase of stranding of the core wires and a second phase of winding of the crown wires around the core wires.
- the Applicant has, therefore, perceived the need to obtain a new structure for a metallic cord in order to improve the performance of said rubber plies, particularly when used for the belt strips of a tyre.
- the Applicant has noted that, in order to eliminate the defects found in the plies, the prior art increasingly gave the most external wires (i.e., the crown wires) of the cord the function of a sheath enclosing all the core wires. In order to do this, the tendency among designers has been to use core wires of a diameter smaller than the diameter of the crown wires. This design tendency is accompanied by a good visual assessment of the cord itself which shows a circular or elliptical transverse section which gives a sense of constructional regularity to which a certain reliability m working conditions can be conceded.
- the first aspect of the invention is therefore a steel cord for reinforcing rubber articles comprising three core wires and, wound around said core wires, six crown wires, the cord being characterized in that all the wires have the same diameter, said diameter being comprised between 0.30 mm and 0.40 mm.
- Said wires are preferably in HT steel and have a diameter of 0.35 mm.
- the core wires of said cord are helically wound together according to a first winding pitch and the crown wires are twisted and helically wound around the core wires according to a second winding pitch.
- said first and second winding pitches are between 10 mm and 20 mm.
- At least one of the core wires in at least one of the cross sections along the length of the cord is positioned on the curvilinear (circular or helical) profile which externally defines said crown configuration .
- the invention relates to a reinforcing ply for rubber articles comprising a plurality of metallic cords as previously defined which are arranged parallel to each other and enclosed in an elastomeric matrix.
- the reinforcing ply comprises cords arranged with a density of between 40 cords/dm and 50 cords/dm.
- the " RM" value which defines the ratio between the area of the cross section of the etall and the area of the cross section of the elastomeric material on the cross section of the metallic ply, is not greater than 60%; this " RM” value is usually calculated as the product of the apparent diameter of the cord multiplied by the density.
- the reinforcing ply is made with a total thickness between 190 mm and 250 mm.
- the invention in a third aspect relates to a tyre comprising a belt with at least two reinforcing layers, at least one of which is formed of a ply as previously defined .
- figure 1 shows a cross section of a cord according to the invention
- figure 2 shows a partial cross section of an elastomeric ply enclosing a plurality of cords of the type shown in figure 1
- figure 3 shows a partial perspective view of a tyre provided with the ply shown m fig.
- figures 4 - 7 show partial cross sections of a cord according to the invention, said sections having been enlarged under an electron microscope
- figures 8 - 11 show partial cross sections of a cord of the known type, said sections having been enlarged under an electron microscope
- figure 12 shows a partial top view of a ply according to the invention
- figure 13 shows the ply of figure 12 prepared for a test in which the core wires of a cord according to the invention are withdrawn
- figure 14 shows a device for carrying out said withdrawal test.
- reference sign 1 indicates a steel cord according to the invention.
- Cord 1 comprises three core wires 2 and six crown wires 3.
- the core wires and the crown wires have equal diameter, said diameter being equal to 0.35 mm.
- the cord is of the "3 + 6" type and is generally constructed by means of a manufacturing cycle based on three distinct phases: a first phase in which the core wires are twisted twice, a second phase m which the core wires undergo an untwisting operation and assume a parallel configuration, a third phase in which the six crown wires are twisted twice and at the same time are helically wound around the core wires.
- a final phase the cord is passed through a suitable device in which said cord is subjected to specific deformations, known as "false twists", having the purpose of annulling the internal stresses induced in the cord by the stranding, said internal stresses being responsible for the phenomenon known as “flaring” according to which the wires separate from each other at the ends of a cut cord.
- the wires are produced m HT steel (with a high carbon content, >80%), having a specific breaking load equal to at least 3, 000 MPa.
- the resulting cord is identified by the code 3 x 0.35 + 6 x 0.35 HT with the same winding direction, preferably " S" , both for the core wires and for the crown wires.
- the first pitch of the core wires of said cord is equal to 11 mm and the second pitch of the crown wires is equal to 18 mm.
- the core wires and the crown wires have the same pitch, for example 18 mm.
- the cord of the invention can be used as a reinforcing element for rubber articles.
- the manufacture of these plies is carried out by unwinding from a plurality of bobbins an equal number of cords subjected to a predetermined traction force supplied downstream of a device known with the name of calender.
- the cords pass through a pair of rolls which, turning in opposite directions the one relative to the other, enclose said cords m the space between two sheets of elastomeric material.
- Figure 2 shows a partial cross section of a ply 4 according to the invention.
- Ply 4 can be used in the production of a plurality of rubber articles. More particularly, the ply according to the invention can be used in a tyre of the type shown in figure 3.
- Figure 3 shows a tyre 5, of the "radial" type, comprising: a carcass formed of at least one ply 6 turned up at the ends m the form of a loop to enclose a pair of bead wires 7, 8 for assembling the tyre on a wheel rim (not shown) ; a tread band 9 and a belt layer 10 placed between the tread band and the carcass ply.
- Belt layer 10 includes, m turn, three reinforcing layers: two layers 11, 12 formed of rubberized plies enclosing metallic cords crossed over each other and with respect to the direction of the equatorial plane and preferably also a third layer 13, radially more external than the first two, formed of a rubberized ply enclosing polyamidic fibres circumferentially positioned.
- the ply of the invention is used in one or both of said reinforcing layers 11, 12.
- Table 1 compares two plies which can be used in the tyre of figure 3: a first ply according to the invention and a second ply of the prior art.
- the prior art ply presents, enclosed m an elastomeric matrix, a plurality of C70 carbon steel cords (carbon ⁇ 80%), each of which includes three core wires with diameter equal to 0.20 mm and six crown wires with diameter equal to 0.35 mm.
- the ply of the invention presents a plurality of steel cords with a high carbon content (C80-C82, carbon >80%) each of which includes three core wires and six crown wires with diameter equal to 0.35 mm.
- Table 1
- - RM represents, as a percentage, the metallic filler inside the ply and is expressed as the product of the density multiplied by the apparent diameter 0.
- Table 1 shows that the ply according to the invention has a larger amount of rubber between adjacent cords than a ply of the prior art.
- the increased amount of rubber is intended as an increased attachment of the cords to the rubber of the tyre according to the invention; in practice this characteristic eliminates the risk of detachments of the cords at the end of the ply due to excessive reduction of the amount of rubber between adjacent cords.
- the cord according to the invention shows good penetration of the rubber from the crown towards the core, fact which improves resistance to corrosion and the life of the cord, and therefore, of the tyre which includes elastomeric plies enclosing this type of cord.
- Tests were carried out in order to confirm this positive result by comparing two different plies: a first ply incorporating the cord of the invention and a second ply incorporating the known cord of the prior art.
- the cords had the same "3 + 6" structure, the core wires had a 11 mm pitch and the crown wires had a 18 mm pitch .
- test conditions identical for both the compared cords, were carried out according to the following steps :
- the ply comprising only one cord enclosed in raw rubber was placed m a bath of molten sulphur and kept inside of it for two days at a temperature of 105°C until it was bakelized; b)the raw ply was then placed between two plates and vulcanized at a pressure o-f 30 KN and at a vulcanizing temperature of 151°C for 40 minutes.
- figures 4 - 7 for the cord of the invention and in fi-gures 8 — 11 for, the cord of the prior art were obtained.
- figures 4, 5 and 8, -9 show the cross section of the ply at the end of stage a)
- figures 6, 7 and 10, 11 show the cross section of the ply at the end of stage b) .
- core wires 2 have -been marked with a white square .
- the light patches visible in figures 4 - 11 indicate the presence of sulphur between the wires, therefore the areas relative to -said light patches show that t e rubber has not penetrated into these zones.
- Figures 4 - 7 show an extension -of the light pat-ehes. lower than the extens-ion of the light patches- of figures 8 - 11 relative to the cord of the prior art both at the end of stage a) and at the end of stage b) . Therefore it must be concluded that the cord according to the invention allows a better penetration of tne rubber towards the core wires.
- Figure 14 shows in detail the test carried out on one of five cords 17 - 21 belonging to portion 22 of strip 16. As shown, two pairs of 10 cm-wide metallic plates 24, 25 were placed in contact with the lateral surfaces of cord 17, and pressure was applied on these plates from opposite sides by two flat clamps 25, 26. Cord 17 was subjected to traction and the force necessary to withdraw it from the rubber was measured. The same procedure was carried out on remaining cords 18 - 21.
- Table 2 shows the values of the forces necessary for the withdrawal of the core from the ply, first for the cord according to the invention and then for the cord according to the prior art.
- Table 2 show that the arithmetic average value of the withdrawal load of the core of a cord according to the invention is about five times higher than that of a cord according to the prior art.
- one of core wires 2 of the cord according to the invention is displaced from the centre towards the outside and is positioned on the theoretical curvilinear profile on which all the crown wires are to be found.
- the other cross sections of the same cord, illustrated in figures 6, 7, show all the three core wires in an internal position with respect to the crown wires.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Textile Engineering (AREA)
- Ropes Or Cables (AREA)
- Tires In General (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BR0012986-0A BR0012986A (en) | 1999-08-04 | 2000-07-19 | Reinforcement canvas for rubber articles comprising a plurality of parallel cords, e, tire |
AU66955/00A AU6695500A (en) | 1999-08-04 | 2000-07-19 | Metallic cord for reinforcing rubber articles, in particular tyres |
EP00954532A EP1200275A1 (en) | 1999-08-04 | 2000-07-19 | Metallic cord for reinforcing rubber articles, in particular tyres |
JP2001515145A JP2003506585A (en) | 1999-08-04 | 2000-07-19 | Metal cord to reinforce rubber articles in certain tires |
US10/060,352 US20020157754A1 (en) | 1999-08-04 | 2002-02-01 | Metallic cord for reinforcing rubber articles, in particular tyres. |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP99830507.2 | 1999-08-04 | ||
EP99830507 | 1999-08-04 | ||
US15643399P | 1999-09-28 | 1999-09-28 | |
US60/156,433 | 1999-09-28 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/060,352 Continuation US20020157754A1 (en) | 1999-08-04 | 2002-02-01 | Metallic cord for reinforcing rubber articles, in particular tyres. |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001010656A1 true WO2001010656A1 (en) | 2001-02-15 |
Family
ID=8243541
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2000/006882 WO2001010656A1 (en) | 1999-08-04 | 2000-07-19 | Metallic cord for reinforcing rubber articles, in particular tyres |
Country Status (8)
Country | Link |
---|---|
US (1) | US20020157754A1 (en) |
EP (1) | EP1200275A1 (en) |
JP (1) | JP2003506585A (en) |
AR (1) | AR025024A1 (en) |
AU (1) | AU6695500A (en) |
BR (1) | BR0012986A (en) |
TR (1) | TR200200292T2 (en) |
WO (1) | WO2001010656A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1344954A1 (en) * | 2000-12-20 | 2003-09-17 | Nok-Vibracoustic Co., Ltd | Elastic coupler |
WO2009144746A1 (en) * | 2008-04-21 | 2009-12-03 | Pirelli Tyre S.P.A. | Metallic cord comprising preformed and non-preformed wires |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10357999B2 (en) | 2011-12-27 | 2019-07-23 | Pirelli Tyre S.P.A. | Tyre for motorcycles |
EP3710286B1 (en) * | 2017-11-17 | 2021-12-01 | NV Bekaert SA | A steel cord for rubber reinforcement |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0301776A1 (en) * | 1987-07-23 | 1989-02-01 | TOYO TIRE & RUBBER CO., LTD . | Radial tire |
US5688597A (en) * | 1994-08-08 | 1997-11-18 | Sumitomo Rubber Industries, Ltd. | Tire core |
EP0849098A1 (en) * | 1996-12-17 | 1998-06-24 | The Goodyear Tire & Rubber Company | Tyres with high strength reinforcement |
US6065518A (en) * | 1995-08-01 | 2000-05-23 | Sumitomo Rubber Industries, Ltd. | Heavy duty pneumatic tire with high elongation steel belt cord |
-
2000
- 2000-07-19 WO PCT/EP2000/006882 patent/WO2001010656A1/en not_active Application Discontinuation
- 2000-07-19 AU AU66955/00A patent/AU6695500A/en not_active Abandoned
- 2000-07-19 BR BR0012986-0A patent/BR0012986A/en not_active Application Discontinuation
- 2000-07-19 JP JP2001515145A patent/JP2003506585A/en active Pending
- 2000-07-19 TR TR2002/00292T patent/TR200200292T2/en unknown
- 2000-07-19 EP EP00954532A patent/EP1200275A1/en not_active Withdrawn
- 2000-08-03 AR ARP000104002A patent/AR025024A1/en unknown
-
2002
- 2002-02-01 US US10/060,352 patent/US20020157754A1/en not_active Abandoned
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0301776A1 (en) * | 1987-07-23 | 1989-02-01 | TOYO TIRE & RUBBER CO., LTD . | Radial tire |
US5688597A (en) * | 1994-08-08 | 1997-11-18 | Sumitomo Rubber Industries, Ltd. | Tire core |
US6065518A (en) * | 1995-08-01 | 2000-05-23 | Sumitomo Rubber Industries, Ltd. | Heavy duty pneumatic tire with high elongation steel belt cord |
EP0849098A1 (en) * | 1996-12-17 | 1998-06-24 | The Goodyear Tire & Rubber Company | Tyres with high strength reinforcement |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1344954A1 (en) * | 2000-12-20 | 2003-09-17 | Nok-Vibracoustic Co., Ltd | Elastic coupler |
EP1344954B1 (en) * | 2000-12-20 | 2006-11-22 | Nok-Vibracoustic Co., Ltd | Elastic coupler |
WO2009144746A1 (en) * | 2008-04-21 | 2009-12-03 | Pirelli Tyre S.P.A. | Metallic cord comprising preformed and non-preformed wires |
US8381505B2 (en) | 2008-04-21 | 2013-02-26 | Pirelli Tyre S.P.A. | Metallic cord comprising preformed and non-preformed wires, rubber sheet comprising said cord and tyre comprising at least one layer derived from said rubber sheet |
Also Published As
Publication number | Publication date |
---|---|
JP2003506585A (en) | 2003-02-18 |
US20020157754A1 (en) | 2002-10-31 |
AU6695500A (en) | 2001-03-05 |
BR0012986A (en) | 2002-04-23 |
TR200200292T2 (en) | 2002-06-21 |
AR025024A1 (en) | 2002-11-06 |
EP1200275A1 (en) | 2002-05-02 |
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