EP1773606A1 - Reinforcing cord for elastomeric products - Google Patents

Reinforcing cord for elastomeric products

Info

Publication number
EP1773606A1
EP1773606A1 EP05752748A EP05752748A EP1773606A1 EP 1773606 A1 EP1773606 A1 EP 1773606A1 EP 05752748 A EP05752748 A EP 05752748A EP 05752748 A EP05752748 A EP 05752748A EP 1773606 A1 EP1773606 A1 EP 1773606A1
Authority
EP
European Patent Office
Prior art keywords
cord
metallic
elongation
reinforcing
reinforcing cord
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Withdrawn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
EP05752748A
Other languages
German (de)
French (fr)
Inventor
Wolfgang Reese
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.)
Continental AG
Original Assignee
Continental AG
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 Continental AG filed Critical Continental AG
Publication of EP1773606A1 publication Critical patent/EP1773606A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • B60C9/0042—Reinforcements made of synthetic materials
    • 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
    • B60C9/005—Reinforcements made of different materials, e.g. hybrid or composite 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
    • B60C9/0057—Reinforcements comprising preshaped elements, e.g. undulated or zig-zag filaments
    • 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
    • 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
    • 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
    • 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
    • D07B2201/2055—Cores characterised by their structure comprising filaments or fibers
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2205/00—Rope or cable materials
    • D07B2205/20—Organic high polymers
    • D07B2205/2039—Polyesters
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2205/00—Rope or cable materials
    • D07B2205/20—Organic high polymers
    • D07B2205/2046—Polyamides, e.g. nylons
    • D—TEXTILES; PAPER
    • D07—ROPES; CABLES OTHER THAN ELECTRIC
    • D07B—ROPES OR CABLES IN GENERAL
    • D07B2205/00—Rope or cable materials
    • D07B2205/20—Organic high polymers
    • D07B2205/2067—Viscose or regenerated cellulose, e.g. Rayon
    • 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
    • D07B2401/2005—Elongation or elasticity
    • 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
    • D07B2501/2046—Tire cords
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2331/00—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products
    • D10B2331/02—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyamides
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2331/00—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products
    • D10B2331/04—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyesters, e.g. polyethylene terephthalate [PET]

Definitions

  • the invention relates to a reinforcing cord for elastomeric products, in particular for the belt bandage of vehicle pneumatic tires, made of a non-metallic cord core, which is helically wound with at least one metallic filament. Further, the invention relates to a pneumatic vehicle tire comprising a belt bandage containing the reinforcing cords.
  • a pneumatic vehicle tire which generally has an air-impermeable inner layer, a radial carcass containing strength carriers, which extends from the zenith region of the tire through the sidewalls extends into the bead area and is anchored there by wrapping tensile bead cores, a radially outer, Prof ⁇ lrillen having rubber tread strip and a belt between the rubber tread and the carcass has to provide a belt bandage.
  • the belt bandage may be formed in one or more layers, covers at least the belt edges and includes parallel and substantially circumferentially extending reinforcements in the form of cords, which are embedded in rubber.
  • the bandage is applied in the manufacture of tires in the form of layers with embedded in an unvulcanized rubber compound reinforcing agents that are wound or wound on the belt.
  • the strength members are embedded in rubber for such layers by a set of substantially parallel filiform reinforcing members, which are usually thermally and / or for better adhesion to the embedding rubber in the known manner with a
  • Impregnation are pretreated, in the longitudinal direction passes through a calender or an extruder for coating with a rubber mixture.
  • a calender or an extruder for coating with a rubber mixture.
  • the Bombage and Vulcanization of the tire usually raises / expands the tire in the shoulder region by about 1 to 2% and in the middle region by about 3 to 4% compared to the unvulcanized blank when the blank is wound on a flat drum.
  • the cords of the bandage are to allow a sufficient elevation in the camber and in the vulcanization mold in the tire production, so that the tire can be formed precisely, and they should ensure a good high speed capability after the completion of the tire while driving.
  • the cords should stretch to an elongation of about 4% with relatively little effort and from an elongation of about 6% only with very high force.
  • non-metallic hybrid cords made of yarns of high modulus of elasticity (eg of aromatic polyamide) and of yarns of lower modulus of elasticity (e.g. B. nylon) are twisted together.
  • the cords point in one
  • EP-A-325475 discloses reinforcing cords for elastomeric products comprising a non-metallic cord core and at least two brass-coated steel filaments, the steel filaments being wound in opposite directions helically around the cord core.
  • the cords can z. B. are used for tires and should combine high cut resistance with high rigidity.
  • the cords known from EP-A-325475 have only a low force value of maximum 80 N in the force-elongation diagram at 6% elongation and are therefore not suitable for use as belt bandage material of high-speed tires. Furthermore, it has been found that the crossing points of the steel filaments formed by the opposite wrapping affect the durability of the cords and thus also the durability of the elastomeric product.
  • a reinforcing cord of a non-metallic cord core which is wound helically with at least one metallic filament, wherein the reinforcing cord has the following force-elongation properties: a maximum of 25 N at 1% elongation, a maximum of 40 N at 2% elongation, maximum 60 N at 3% elongation, maximum 95 N at 4% elongation and 'at least 200 N at 6% elongation.
  • the reinforcing cords according to the invention combine the properties of non-metallic yarns or cords forming the cord core in a small expansion range up to about 4% elongation with the high modulus of elasticity of metal filaments in the range from 4% elongation.
  • stretching the reinforcing cords at first only the stretching behavior of the non-metallic cord core comes into play, since the metallic filaments are wound helically and are not present in stretched form. At first, the metallic filaments only change their shape from the helix to a stretched state. Only when the filaments are in stretched form, the metallic filaments contribute significantly to the force-strain behavior.
  • the reinforcing cords of the invention are compared with non-metallic hybrid cords with z. B. aromatic polyamide as yarn with high modulus of elasticity cost.
  • the mechanical properties of the reinforcing cord according to the invention advantageously remain essentially unchanged during long-term use.
  • the reinforcing cord has the following force-elongation properties: a maximum of 25 N at 1% elongation, a maximum of 40 N at 2% elongation, a maximum of 60 N at 3% elongation, a maximum of 95 N at 4% elongation and at least 200 N at 6 % Strain.
  • Cord core at least two metallic filaments helical, wound in parallel in the same direction.
  • the metallic filaments are not twisted together. It has been found that cross-shaped overlays of metallic filaments can lead to durability problems when using the cord by friction. Due to the parallel wrapping such crossing points are excluded.
  • At least two metallic filaments are twisted together (twisted, stranded) and this thread is wound helically around the cord core.
  • this configuration the extensibility of the reinforcing cord can be further increased.
  • non-metallic cord core various textile yarns or cords having sufficient elongation properties in the lower force range can be used.
  • yarns or cords made of polyamide for example nylon 6.6 or nylon 6
  • polyester for example nylon 6.6 or nylon 6
  • non-metallic cord core has a diameter of 0.3 to 0.8 mm, preferably 0.3 to 0.65 mm (tested according to DIN 53855).
  • the metallic filaments wrapped around the cord core are preferably brassed brass filaments.
  • Steel has a particularly high modulus of elasticity and the brass layer contributes to better bonding of the cord to the surrounding elastomer matrix.
  • the steel of the steel filaments has a carbon content of 0.6 to 0.9% in order to ensure sufficient strength of the cords.
  • the metallic filaments preferably have a diameter of 0.15 to 0.25 mm in order to ensure a sufficient force-elongation behavior with the smallest possible diameter of the reinforcing cord.
  • the lay length of the winding of the metallic filaments around the cord core is preferably 5 to 14 mm, more preferably 8 to 13 mm.
  • the filaments can be arranged parallel according to the embodiment according to claim 2, the direction of impact is insignificant, it is only important that when using more than one filament, the direction of impact does not change, d. that is, the filaments do not intersect.
  • the direction of impact is insignificant.
  • the metallic filaments are preformed in the manner and wound around the cord core, that from a 4% elongation of Reinforcement cord the metallic filaments are aligned substantially parallel to the cord axis. From an elongation of the cord of 4% then the transition takes place in such a way that then determine the stretched metallic filaments with their modulus of elasticity substantially the force-strain behavior of the entire reinforcing cord. If such cords are used as belt bandage material for pneumatic vehicle tires, the tires have a particularly good high-speed capability. An elevation of the tire at high speeds is counteracted.
  • the reinforcing cords according to the invention are preferably used as belt bandage material in pneumatic vehicle tires. However, it is also possible to use the reinforcing cords for the carcass, the belt and / or the bead reinforcement of pneumatic vehicle tires.
  • Fig. 1 shows schematically the reinforcing cord according to the invention
  • Fig. 2 shows the force-strain diagram of a reinforcing cord according to the invention
  • the cord core 1 is wound with two steel filaments 2, 2 ', which lie next to each other and touch each other, helically.
  • Fig. 2 the force-elongation diagram of a reinforcing cord determined in accordance with ASTM D 885 is shown, wherein the reinforcing cord had a cord core 1 made of a polyester yarn with a diameter of 0.65 mm, which helically with two steel filaments 2, 2 ' , as shown in Fig. 1, was wrapped.
  • the steel filaments had a diameter of 0.25 mm and were wrapped around the cord core 1 with a lay length of 12 mm.
  • the cord has a moderate force increase in the range between 0 and 4% elongation up to a maximum of 95 N having. This allows when using the cord as Gürtalbandage the required slight elongation in the camber and vulcanization. From an elongation of 4% to the elongation at maximum tensile force then takes a very steep increase in the force-strain curve. Thus, after the production of the tire another survey at high speed counteracted.

Abstract

The invention relates to a reinforcing cord for elastomeric products, in particular, for the ply belts of vehicle pneumatic tyres, made from a non-metallic cord core (1), helically wound with at least one metallic filament (2, 2'). The reinforcement cord has the following force-extension properties maximum 25 N at 1 % extension, maximum 40 N at 2 % extension, maximum 60 N at 3 % extension, maximum 95 N at 4 % extension and at least 200 N at 6 % extension.

Description

Continental AktiengesellschaftContinental Corporation
Beschreibungdescription
Verstärkungscord für elastomere ErzeugnisseReinforcement cord for elastomeric products
Die Erfindung betrifft einen Verstärkungscord fiir elastomere Erzeugnisse, insbesondere für die Gürtelbandage von Fahrzeuglufitreifen, aus einem nicht-metallischen Cord-Kern, der mit zumindest einem metallischen Filament wendelförmig umwickelt ist. Ferner betrifft die Erfindung einen Fahrzeugluftreifen, aufweisend eine Gürtelbandage, die die Verstärkungscorde enthält.The invention relates to a reinforcing cord for elastomeric products, in particular for the belt bandage of vehicle pneumatic tires, made of a non-metallic cord core, which is helically wound with at least one metallic filament. Further, the invention relates to a pneumatic vehicle tire comprising a belt bandage containing the reinforcing cords.
Um bei Fahrzeugluftreifen, insbesondere beim Hochgeschwindigkeitseinsatz, eine Erhebung des Reifens durch die im Fahrbetrieb auftretenden Fliehkräfte zu verhindern, ist es bekannt, bei einem Fahrzeugluftreifen, der im Allgemeinen eine luftundurchlässige Innenschicht, eine Festigkeitsträger enthaltende Radialkarkasse, die vom Zenitbereich des Reifens über die Seitenwände bis in den Wulstbereich reicht und dort durch Umschlingen zugfester Wulstkerne verankert ist, einen radial außen befindlichen, Profϊlrillen aufweisenden Gummilaufstreifen und einen Gürtel zwischen dem Gummilaufstreifen und der Karkasse aufweist, eine Gürtelbandage vorzusehen. Die Gürtelbandage kann ein- oder mehrlagig ausgebildet sein, deckt zumindest die Gürtelränder ab und enthält parallel und im Wesentlichen in Umfangsrichtung verlaufende Festigkeitsträger in Form von Corden, die in Gummi eingebettet sind.In order to prevent tire elevation in the case of pneumatic vehicle tires, in particular in high-speed use, due to the centrifugal forces which occur during driving, it is known in a pneumatic vehicle tire which generally has an air-impermeable inner layer, a radial carcass containing strength carriers, which extends from the zenith region of the tire through the sidewalls extends into the bead area and is anchored there by wrapping tensile bead cores, a radially outer, Profϊlrillen having rubber tread strip and a belt between the rubber tread and the carcass has to provide a belt bandage. The belt bandage may be formed in one or more layers, covers at least the belt edges and includes parallel and substantially circumferentially extending reinforcements in the form of cords, which are embedded in rubber.
Die Bandage wird bei der Reifenherstellung in Form von Lagen mit in eine unvulkanisierte Kautschukmischung eingebetteten Festigkeitsträgern aufgebracht, die auf den Gürtel gewickelt oder gespult werden. Die Festigkeitsträger werden für solche Lagen in Kautschuk eingebettet, indem eine Schar von im Wesentlichen parallel liegenden fadenförmigen Festigkeitsträgern, die in der Regel thermisch und/oder zur besseren Haftung am einbettenden Gummi in dem Fachmann bekannter Art mit einerThe bandage is applied in the manufacture of tires in the form of layers with embedded in an unvulcanized rubber compound reinforcing agents that are wound or wound on the belt. The strength members are embedded in rubber for such layers by a set of substantially parallel filiform reinforcing members, which are usually thermally and / or for better adhesion to the embedding rubber in the known manner with a
Imprägnierung vorbehandelt sind, in Längsrichtung einen Kalander oder einen Extruder zur Ummantelung mit einer Kautschukmischung durchläuft. Bei der Bombage und Vulkanisation des Reifens erhebt/dehnt sich der Reifen in der Regel im Schulterbereich um ca. 1 bis 2 % und im Mittenbereich um ca. 3 bis 4 % im Vergleich zum unvulkanisierten Rohling, wenn der Rohling auf einer flachen Trommel gewickelt wird.Impregnation are pretreated, in the longitudinal direction passes through a calender or an extruder for coating with a rubber mixture. At the Bombage and Vulcanization of the tire usually raises / expands the tire in the shoulder region by about 1 to 2% and in the middle region by about 3 to 4% compared to the unvulcanized blank when the blank is wound on a flat drum.
Die Corde der Bandage sollen bei der Reifenherstellung eine ausreichende Erhebung bei der Bombage und in der Vulkanisationsform zulassen, damit der Reifen präzise ausgeformt werden kann, und sie sollen nach der Fertigstellung des Reifens im Fahrbetrieb eine gute Hochgeschwindigkeitstauglichkeit gewährleisten. Dazu sollten sich die Corde bis zu einer Dehnung von ca. 4 % mit relativ geringem Kraftaufwand und ab einer Dehnung von ca. 6 % nur noch mit sehr hohem Kraftaufwand dehnen lassen.The cords of the bandage are to allow a sufficient elevation in the camber and in the vulcanization mold in the tire production, so that the tire can be formed precisely, and they should ensure a good high speed capability after the completion of the tire while driving. For this purpose, the cords should stretch to an elongation of about 4% with relatively little effort and from an elongation of about 6% only with very high force.
In der EP-B 0335 588 und der EP-A 0 661 179 werden als Verstärkungscorde in der Gürtelbandage nicht-metallische Hybridcorde vorgeschlagen, die aus Garnen mit hohem Elastizitätsmodul (z. B. aus aromatischem Polyamid) und aus Garnen mit niedrigerem Elastizitätsmodul (z. B. Nylon) zusammengedreht sind. Die Corde weisen in einemIn EP-B 0335 588 and EP-A-0 661 179 non-metallic hybrid cords made of yarns of high modulus of elasticity (eg of aromatic polyamide) and of yarns of lower modulus of elasticity (e.g. B. nylon) are twisted together. The cords point in one
Zugkraft-Dehnungs-Diagramm bei geringer Dehnung zunächst eine geringe Steigung der Kurve auf; bei höherer Dehnung steigt dann die Kurve stark an. In diesem letzten Bereich ist eine geringe weitere Dehnung z. B. von 6 auf 7 % mit hohem Kraftaufwand verbunden.Tensile force-strain diagram at low elongation first a small slope of the curve; at higher elongation then the curve increases sharply. In this last area is a little further elongation z. B. connected from 6 to 7% with high effort.
Aus der EP-A-325475 sind Verstärkungscorde für elastomere Erzeugnisse bekannt, die einen nicht-metallischen Cord-Kern und wenigstens zwei messingüberzogene Stahlfilamente aufweisen, wobei die Stahlfilamente in entgegengesetzte Richtungen wendeiförmig um den Cord-Kern gewickelt sind. Die Corde können z. B. für Reifen verwendet werden und sollen eine hohe Schnittfestigkeit mit hoher Steifigkeit vereinen. Die aus der EP-A-325475 bekannten Corde weisen im Kraft-Dehnungs-Diagramm bei 6 %iger Dehnung nur einen geringen Kraftwert von maximal 80 N auf und sind daher für die Anwendung als Gürtelbandagenmaterial von Hochgeschwindigkeitsreifen nicht geeignet. Ferner hat sich herausgestellt, dass die Kreuzungspunkte der Stahlfilamente, die durch das entgegengesetzte Umwickeln entstehen, die Haltbarkeit der Corde und damit auch die Haltbarkeit des elastomeren Erzeugnisses beeinträchtigen. Der vorliegenden Erfindung liegt die Aufgabe zu Grunde, Verstärkungscorde für elastomere Erzeugnisse bereitzustellen, die sich durch ein Kraft-Dehnungs-Verhalten auszeichnen, das bei Verwendung der Corde als Gürtelbandage in Fahrzeugluftreifen einen problemlosen Reifenbau mit Vulkanisation ermöglicht und dem Reifen eine große Hochgeschwindigkeitstauglichkeit verleiht.EP-A-325475 discloses reinforcing cords for elastomeric products comprising a non-metallic cord core and at least two brass-coated steel filaments, the steel filaments being wound in opposite directions helically around the cord core. The cords can z. B. are used for tires and should combine high cut resistance with high rigidity. The cords known from EP-A-325475 have only a low force value of maximum 80 N in the force-elongation diagram at 6% elongation and are therefore not suitable for use as belt bandage material of high-speed tires. Furthermore, it has been found that the crossing points of the steel filaments formed by the opposite wrapping affect the durability of the cords and thus also the durability of the elastomeric product. It is an object of the present invention to provide reinforcing cords for elastomeric products characterized by a force-elongation performance which, when used as a belt bandage in pneumatic vehicle tires, enables easy tire building with vulcanization and imparts high speed capability to the tire.
Gelöst wird diese Aufgabe erfindungsgemäß durch einen Verstärkungscord aus einem nicht-metallischen Cord-Kern, der mit zumindest einem metallischen Filament wendeiförmig umwickelt ist, wobei der Verstärkungscord folgende Kraft-Dehnungs- Eigenschaften aufweist: maximal 25 N bei 1 % Dehnung, maximal 40 N bei 2 % Dehnung, maximal 60 N bei 3 % Dehnung, maximal 95 N bei 4 % Dehnung und' mindestens 200 N bei 6 % Dehnung.This object is achieved according to the invention by a reinforcing cord of a non-metallic cord core, which is wound helically with at least one metallic filament, wherein the reinforcing cord has the following force-elongation properties: a maximum of 25 N at 1% elongation, a maximum of 40 N at 2% elongation, maximum 60 N at 3% elongation, maximum 95 N at 4% elongation and 'at least 200 N at 6% elongation.
Die erfindungsgemäßen Verstärkungscorde vereinen die Eigenschaften von nicht¬ metallischen Garnen oder Corden, die den Cord-Kern bilden, in geringem Dehnungsbereich bis ca. 4 % Dehnung mit dem hohen Elastizitätsmodul von Metallfilamenten im Bereich ab 4 % Dehnung. Bei der Dehnung der Verstärkungscorde kommt zunächst nur das Dehnungsverhalten des nicht-metallischen Cord-Kerns zum Tragen, da die metallischen Filamente wendeiförmig gewickelt und nicht in gestreckter Form vorliegen. Die metallischen Filamente ändern bei der Dehnung zunächst nur ihre Form von der Wendel zu einem gestreckten Zustand. Erst wenn die Filamente in gestreckter Form vorliegen, tragen die metallischen Filamente wesentlich zum Kraft- Dehnungs- Verhalten bei.The reinforcing cords according to the invention combine the properties of non-metallic yarns or cords forming the cord core in a small expansion range up to about 4% elongation with the high modulus of elasticity of metal filaments in the range from 4% elongation. When stretching the reinforcing cords, at first only the stretching behavior of the non-metallic cord core comes into play, since the metallic filaments are wound helically and are not present in stretched form. At first, the metallic filaments only change their shape from the helix to a stretched state. Only when the filaments are in stretched form, the metallic filaments contribute significantly to the force-strain behavior.
Die erfindungsgemäßen Verstärkungscorde sind im Vergleich zu nicht-metallischen Hybridcorden mit z. B. aromatischem Polyamid als Garn mit hohem Elastizitätsmodul kostengünstiger. Die mechanischen Eigenschaften des erfindungsgemäßen Verstärkungscordes bleiben vorteilhafterweise im Langzeiteinsatz im Wesentlichen unverändert erhalten.The reinforcing cords of the invention are compared with non-metallic hybrid cords with z. B. aromatic polyamide as yarn with high modulus of elasticity cost. The mechanical properties of the reinforcing cord according to the invention advantageously remain essentially unchanged during long-term use.
Bevorzugt weist der Verstärkungscord die folgenden Kraft-Dehnungs-Eigenschaften auf: maximal 25 N bei 1 % Dehnung, maximal 40 N bei 2 % Dehnung, maximal 60 N bei 3 % Dehnung, maximal 95 N bei 4 % Dehnung und mindestens 200 N bei 6 % Dehnung.Preferably, the reinforcing cord has the following force-elongation properties: a maximum of 25 N at 1% elongation, a maximum of 40 N at 2% elongation, a maximum of 60 N at 3% elongation, a maximum of 95 N at 4% elongation and at least 200 N at 6 % Strain.
Gemäß einer vorteilhaften Ausgestaltung der Erfindung sind um den nicht-metallischenAccording to an advantageous embodiment of the invention are the non-metallic
Cord-Kern zumindest zwei metallische Filamente wendeiförmig, in gleicher Richtung parallel gewickelt. Die metallischen Filamente sind dabei nicht untereinander verzwirnt. Es hat sich herausgestellt, dass kreuzförmige Überlagerungen von metallischen Filamenten beim Einsatz des Cordes durch Reibung zu Haltbarkeitsproblemen führen können. Durch die parallele Umwicklung werden solche Kreuzungspunkte ausgeschlossen.Cord core at least two metallic filaments helical, wound in parallel in the same direction. The metallic filaments are not twisted together. It has been found that cross-shaped overlays of metallic filaments can lead to durability problems when using the cord by friction. Due to the parallel wrapping such crossing points are excluded.
Gemäß einer alternativen Ausgestaltung der Erfindung ist es aber auch möglich, dass zumindest zwei metallische Filamente untereinander verzwirnt (vertwistet, verseilt) sind und dieser Zwirn wendeiförmig um den Cord-Kern gewickelt ist. Mit dieser Ausgestaltung lässt sich die Dehnfähigkeit des Verstärkungscordes weiter erhöhen.According to an alternative embodiment of the invention, it is also possible that at least two metallic filaments are twisted together (twisted, stranded) and this thread is wound helically around the cord core. With this configuration, the extensibility of the reinforcing cord can be further increased.
Für den nicht-metallischen Cord-Kern können unterschiedliche textile Garne oder Corde verwendet werden, die ausreichende Dehnungseigenschaften im unteren Kraftbereich aufweisen. Bevorzugt werden jedoch Garne oder Corde aus Polyamid (z. B. Nylon 6.6 oder Nylon 6), Polyester oder Reyon eingesetzt.For the non-metallic cord core, various textile yarns or cords having sufficient elongation properties in the lower force range can be used. However, preference is given to using yarns or cords made of polyamide (for example nylon 6.6 or nylon 6), polyester or rayon.
Da die Verstärkungscorde für den Einsatz als Material für die Gürtelbandage eines Fahrzeugluftreifens nicht zu dick und schwer sein sollten, um die Laufeigenschaften des Reifens nicht negativ zu beeinflussen, hat es sich als vorteilhaft herausgestellt, dass der nicht-metallische Cord-Kern einen Durchmesser von 0,3 bis 0,8 mm, vorzugsweise 0,3 bis 0,65 mm, aufweist (getestet nach DIN 53855).Since the reinforcing cords for use as a material for the belt bandage of a pneumatic vehicle tire should not be too thick and heavy, so as not to adversely affect the running properties of the tire, it has been found to be advantageous non-metallic cord core has a diameter of 0.3 to 0.8 mm, preferably 0.3 to 0.65 mm (tested according to DIN 53855).
Um die Haftung von textilen Festigkeitsträgern zum Gummi zu gewährleisten, ist es üblich, die textilen Garne oder Corde mit einer Haftimprägnierung, z. B. einem RFL-Dip, zu versehen.In order to ensure the adhesion of textile reinforcements to the rubber, it is customary, the textile yarns or cords with an adhesive impregnation, for. As an RFL dip to provide.
Bei den metallischen Filamenten, mit denen der Cord-Kern umwickelt ist, handelt es sich bevorzugt um vermessingte Stahlfilamente. Stahl hat einen besonders hohen Elastizitätsmodul und die Messingschicht trägt zur besseren Anbindung des Cordes an die umgebende Elastomermatrix bei.The metallic filaments wrapped around the cord core are preferably brassed brass filaments. Steel has a particularly high modulus of elasticity and the brass layer contributes to better bonding of the cord to the surrounding elastomer matrix.
Gemäß einer vorteilhaften Weiterbildung der Erfindung weist der Stahl der Stahlfilamente einen Kohlenstoffgehalt von 0,6 bis 0,9 % auf, um eine ausreichende Festigkeit der Corde zu gewährleisten.According to an advantageous development of the invention, the steel of the steel filaments has a carbon content of 0.6 to 0.9% in order to ensure sufficient strength of the cords.
Die metallischen Filamente weisen bevorzugt einen Durchmesser von 0,15 bis 0,25 mm auf, um ein ausreichendes Kraft-Dehnungs- Verhalten bei möglichst geringem Durchmesser des Verstärkungscordes sicherzustellen.The metallic filaments preferably have a diameter of 0.15 to 0.25 mm in order to ensure a sufficient force-elongation behavior with the smallest possible diameter of the reinforcing cord.
Die Schlaglänge der Wicklung der metallischen Filamente um den Cord-Kern beträgt bevorzugt 5 bis 14 mm, besonders bevorzugt 8 bis 13 mm. Die Filamente können dabei gemäß der Ausbildung nach Anspruch 2 parallel angeordnet sein, die Schlagrichtung ist dabei unbedeutend, wichtig ist nur, dass bei Verwendung von mehr als einem Filament die Schlagrichtung nicht wechselt, d. h., dass die Filamente sich nicht kreuzen. Für die alternative Ausgestaltung der Erfindung gemäß Anspruch 3 mit verzwirnten metallischen Filamenten, die um den Cord-Kern gewickelt werden, gelten die gleichen bevorzugten Schlaglängen und auch hier ist die Schlagrichtung unbedeutend.The lay length of the winding of the metallic filaments around the cord core is preferably 5 to 14 mm, more preferably 8 to 13 mm. The filaments can be arranged parallel according to the embodiment according to claim 2, the direction of impact is insignificant, it is only important that when using more than one filament, the direction of impact does not change, d. that is, the filaments do not intersect. For the alternative embodiment of the invention according to claim 3 with twisted metallic filaments which are wound around the cord core, apply the same preferred lay lengths and also here the direction of impact is insignificant.
Als vorteilhaft hat es sich erwiesen, dass die metallischen Filamente in der Art vorverformt und um den Cord-Kern gewickelt sind, dass ab einer 4 %igen Dehnung des Verstärkungscordes die metallischen Filamente im Wesentlichen parallel zur Cordachse ausgerichtet sind. Ab einer Dehnung des Cordes von 4 % erfolgt dann der Übergang dahingehend, dass dann die gestreckten metallischen Filamente mit ihrem Elastizitätsmodul im Wesentlichen das Kraft-Dehnungs- Verhalten des gesamten Verstärkungscordes bestimmen. Verwendet man solche Corde als Gürtelbandagenmaterial für Fahrzeugluftreifen, so weisen die Reifen eine besonders gute Hochgeschwindigkeits- tauglichkeit auf. Einer Erhebung des Reifens bei hohen Geschwindigkeiten wird entgegengewirkt.It has proven to be advantageous that the metallic filaments are preformed in the manner and wound around the cord core, that from a 4% elongation of Reinforcement cord the metallic filaments are aligned substantially parallel to the cord axis. From an elongation of the cord of 4% then the transition takes place in such a way that then determine the stretched metallic filaments with their modulus of elasticity substantially the force-strain behavior of the entire reinforcing cord. If such cords are used as belt bandage material for pneumatic vehicle tires, the tires have a particularly good high-speed capability. An elevation of the tire at high speeds is counteracted.
Die erfindungsgemäßen Verstärkungscorde werden bevorzugt als Gürtelbandagematerial in Fahrzeugluftreifen eingesetzt. Es ist aber auch möglich, die Verstärkungscorde für die Karkasse, den Gürtel und/oder den Wulstverstärker von Fahrzeugluftreifen zu verwenden.The reinforcing cords according to the invention are preferably used as belt bandage material in pneumatic vehicle tires. However, it is also possible to use the reinforcing cords for the carcass, the belt and / or the bead reinforcement of pneumatic vehicle tires.
Im Folgenden wird die Erfindung anhand eines vorteilhaften Ausfuhrungsbeispiels unter Bezugnahme auf die beigefügten Figuren näher erläutert. Dabei zeigtIn the following the invention will be explained in more detail with reference to an advantageous exemplary embodiment with reference to the attached figures. It shows
Fig. 1 schematisch den erfindungsgemäßen VerstärkungscordFig. 1 shows schematically the reinforcing cord according to the invention
Fig. 2 das Kraft-Dehnungs-Diagramm eines erfindungsgemäßen VerstärkungscordesFig. 2 shows the force-strain diagram of a reinforcing cord according to the invention
In der Fig. 1 ist ein Verstärkungscord mit einem Cord-Kern 1 z. B. aus einem Polyestergarn dargestellt. Der Cord-Kern 1 ist mit zwei Stahlfilamenten 2, 2', die nebeneinander liegen und sich berühren, wendelfδrmig umwickelt.In Fig. 1, a reinforcing cord with a cord core 1 z. B. shown from a polyester yarn. The cord core 1 is wound with two steel filaments 2, 2 ', which lie next to each other and touch each other, helically.
In Fig. 2 ist das Kraft-Dehnungs-Diagramm eines Verstärkungscordes ermittelt gemäß ASTM D 885 dargestellt, wobei der Verstärkungscord einen Cord-Kern 1 aus einem Polyestergarn mit einem Durchmesser von 0,65 mm aufwies, der mit zwei Stahlfilamenten 2, 2' wendeiförmig, wie in Fig. 1 dargestellt, umwickelt war. Die Stahlfilamente wiesen einen Durchmesser von 0,25 mm auf und wurden mit einer Schlaglänge von 12 mm um den Cord-Kern 1 gewickelt. Aus dem Diagramm wird ersichtlich, dass der Cord einen moderaten Kraftanstieg im Bereich zwischen 0 und 4 % Dehnung bis maximal 95 N aufweist. Dies ermöglicht bei Verwendung des Cordes als Gürtalbandage die erforderliche leichte Dehnung bei der Bombage und Vulkanisation. Ab einer Dehnung von 4 % bis zur Dehnung bei Höchstzugkraft erfolgt dann eine sehr steiler Anstieg der Kraft-Dehnungs- Kurve. So wird nach der Herstellung des Reifens einer weiteren Erhebung bei schneller Fahrt entgegengewirkt. In Fig. 2, the force-elongation diagram of a reinforcing cord determined in accordance with ASTM D 885 is shown, wherein the reinforcing cord had a cord core 1 made of a polyester yarn with a diameter of 0.65 mm, which helically with two steel filaments 2, 2 ' , as shown in Fig. 1, was wrapped. The steel filaments had a diameter of 0.25 mm and were wrapped around the cord core 1 with a lay length of 12 mm. From the diagram it can be seen that the cord has a moderate force increase in the range between 0 and 4% elongation up to a maximum of 95 N having. This allows when using the cord as Gürtalbandage the required slight elongation in the camber and vulcanization. From an elongation of 4% to the elongation at maximum tensile force then takes a very steep increase in the force-strain curve. Thus, after the production of the tire another survey at high speed counteracted.

Claims

Patentansprüche claims
1. Verstärkungscord für elastomere Erzeugnisse, insbesondere für die Gürtelbandage von Fahrzeugluftreifen, aus einem nicht-metallischen Cord-Kern (1), der mit zumindest einem metallischen Filament (2, 2 ') wendeiförmig umwickelt ist, wobei der Verstärkungscord folgende Kraft-Dehnungs-Eigenschaften aufweist: maximal 25 N bei 1 % Dehnung, maximal 40 N bei 2 % Dehnung, maximal 60 N bei 3 % Dehnung, maximal 95 N bei 4 % Dehnung und mindestens 200 N bei 6 % Dehnung.A reinforcing cord for elastomeric products, in particular for the belt bandage of pneumatic vehicle tires, of a non-metallic cord core (1) which is wound helically with at least one metallic filament (2, 2 '), the reinforcing cord having the following force-elongation Characteristics: maximum 25 N at 1% elongation, maximum 40 N at 2% elongation, maximum 60 N at 3% elongation, maximum 95 N at 4% elongation and at least 200 N at 6% elongation.
2. Verstärkungscord nach Anspruch I5 dadurch gekennzeichnet, dass zumindest zwei metallische Filamente (2, 2') um den nicht-metallischen Cord-Kern (1) wendeiförmig, in gleicher Richtung parallel gewickelt sind.2. reinforcing cord according to claim I 5, characterized in that at least two metallic filaments (2, 2 ') around the non-metallic cord core (1) helically, are wound in parallel in the same direction.
3. Verstärkungscord nach Anspruch 1, dadurch gekennzeichnet, dass zumindest zwei metallische Filamente untereinander verzwirnt sind und dieser Zwirn wendelförmig um den Cord-Kern (1) gewickelt ist.3. reinforcing cord according to claim 1, characterized in that at least two metallic filaments are twisted together and this thread is wound helically around the cord core (1).
4. Verstärkungscord nach zumindest einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass der nicht-metallische Cord-Kern (1) ein Garn oder Cord aus Polyester, Polyamid- oder Reyon ist.4. reinforcing cord according to at least one of claims 1 to 3, characterized in that the non-metallic cord core (1) is a yarn or cord made of polyester, polyamide or rayon.
5. Verstärkungscord nach zumindest einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass der nicht-metallische Cord-Kern (1) einen Durchmesser von 0,3 bis 0,8 mm, vorzugsweise 0,3 bis 0,65 mm, aufweist.5. reinforcing cord according to at least one of claims 1 to 4, characterized in that the non-metallic cord core (1) has a diameter of 0.3 to 0.8 mm, preferably 0.3 to 0.65 mm.
6. Verstärkungscord nach zumindest einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die metallischen Filamente (2, 2') vermessingte Stahlfilamente sind. 6. reinforcing cord according to at least one of claims 1 to 5, characterized in that the metallic filaments (2, 2 ') are brassed brassfilamente.
7. Verstärkungscord nach Ansprach 6, dadurch gekennzeichnet, dass der Stahl der Stahlfilamente einen Kohlenstoffgehalt von 0,6 bis 0,9 % aufweist.7. reinforcing cord according to claim 6, characterized in that the steel of the steel filaments has a carbon content of 0.6 to 0.9%.
8. Verstärkungscord nach zumindest einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass die metallischen Filamente (2, 2') einen Durchmesser von 0,15 bis 0,25 mm aufweisen.8. reinforcing cord according to at least one of claims 1 to 7, characterized in that the metallic filaments (2, 2 ') have a diameter of 0.15 to 0.25 mm.
9. Verstärkungscord nach zumindest einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass die metallischen Filamente (2, 2') eine Schlaglänge von 5 bis 14 mm, vorzugweise von 8 bis 13 mm, aufweisen.9. reinforcing cord according to at least one of claims 1 to 8, characterized in that the metallic filaments (2, 2 ') has a lay length of 5 to 14 mm, preferably from 8 to 13 mm.
10. Verstärkungscord nach zumindest einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass die metallischen Filamente (2, 2') in der Art vorverformt und um den Cord-Kern (1) gewickelt sind, dass ab einer 4 %igen Dehnung des10. reinforcing cord according to at least one of claims 1 to 9, characterized in that the metallic filaments (2, 2 ') are pre-deformed in the manner and wound around the cord core (1) that from a 4% elongation of
Verstärkungscordes die metallischen Filamente (2, 2') im Wesentlichen parallel zur Cordachse ausgerichtet sind.Reinforcement cord the metallic filaments (2, 2 ') are aligned substantially parallel to the cord axis.
11. Fahrzeugluftreifen, aufweisend eine Gürtelbandage, die Verstärkungscorde nach zumindest einem der Ansprüche 1 bis 10 enthält. A pneumatic vehicle tire comprising a belt bandage containing reinforcing cords according to at least one of claims 1 to 10.
EP05752748A 2004-07-24 2005-05-30 Reinforcing cord for elastomeric products Withdrawn EP1773606A1 (en)

Applications Claiming Priority (2)

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DE200410036129 DE102004036129A1 (en) 2004-07-24 2004-07-24 Reinforcement cord for elastomeric products
PCT/EP2005/052443 WO2006010658A1 (en) 2004-07-24 2005-05-30 Reinforcing cord for elastomeric products

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EP2748015B1 (en) * 2011-12-27 2017-03-29 Pirelli Tyre S.p.A. Tyre for motorcycles
RU2662890C2 (en) 2013-12-23 2018-07-31 Пирелли Тайр С.П.А. High-capacity transport vehicles wheels tire
KR101869147B1 (en) * 2016-01-25 2018-06-19 한국타이어 주식회사 Hybrid cord and tire using the same
FR3092343A1 (en) * 2019-02-05 2020-08-07 Compagnie Generale Des Etablissements Michelin High energy breaking multi-strand 1xN cable
IT202000014521A1 (en) 2020-06-17 2021-12-17 Pirelli TIRE FOR VEHICLE WHEELS

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JPH0538075Y2 (en) * 1988-01-20 1993-09-27
JP2757940B2 (en) * 1988-03-28 1998-05-25 住友ゴム工業株式会社 Pneumatic tire
JPH0641881A (en) * 1992-05-20 1994-02-15 Bridgestone Corp Composite cord for reinforcing elastomer product
JP3118958B2 (en) * 1992-06-04 2000-12-18 住友電気工業株式会社 Composite cord for reinforcing rubber articles
DE10144833A1 (en) * 2001-09-12 2003-04-30 Continental Ag reinforcing cord
FR2841573A1 (en) * 2002-06-26 2004-01-02 Michelin Soc Tech LAYERED HYBRID CABLES FOR REINFORCING TIRES

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