Method for producing pneumatic vehicle tyre, and pneumatic vehicle tyre

Abstract

A method for producing a pneumatic vehicle tyre (1) having a belt assembly (3) with a plurality of reinforcing element plies (4, 5) and at least one electrically conductive ply (6), the method comprises at least the following steps: b) building the belt assembly (3) on the arranged carcass (2) by at least the following two steps: b1) applying the reinforcing element plies (4, 5) of the belt assembly, the reinforcing element plies together occupying an axial region (9) delimited by two axial boundaries (8) in the axial extent thereof; b2) connecting the at least one electrically conductive line (10, 10 '; the at least one electrically conductive wire (10, 10 ', 10' ') is applied at least to the radially outermost, already built part of the tyre to be made, which is one of the reinforcing element plies (4, 5) of the carcass (2) or of the belt assembly (3), for building the electrically conductive ply (6, 6'), and the at least one electrically conductive wire (10, 10 ', 10' ') is applied to the radially outermost, already built part of the tyre to be made, which is one of the reinforcing element plies (4, 5) of the carcass (2) or of the belt assembly (3). 10 '') is arranged in such a way that, over the circumferential extent of the belt assembly (3), the at least one conductor wire repeatedly intersects over at least one of the axial boundaries (8) in each case. The invention also relates to a corresponding pneumatic vehicle tire.

Description

Technical Field

[0001] This invention relates to a method for producing a pneumatic vehicle tire having, in particular, a radial carcass and a belt ply assembly, the belt ply assembly having a plurality of reinforcing element plies and at least one conductive ply. The invention also relates to a pneumatic vehicle tire having a carcass, a belt ply assembly applied radially to the carcass from the outside, and a tread, the belt ply assembly having a plurality of reinforcing element plies and a conductive ply contacting at least one of these reinforcing element plies, and these reinforcing element plies collectively occupying an axial region defined by two axial boundaries in their axial direction. Background Technology

[0002] It is known that using tire components containing rubber compounds with low hysteresis is advantageous for reducing rolling resistance. Measures used in this regard specifically include the use of low-activity fillers, the use of small amounts of active fillers, or the use of silica (silica) instead of carbon black. Each of these measures results in an increase in the resistance of the rubber compound or components containing that compound. However, these tire components, designed to have low rolling resistance, possess such high resistance that they no longer have sufficient conductivity. This means the tire no longer provides sufficient conductivity necessary to dissipate the charge generated by the vehicle's static charge.

[0003] To resolve the conflicting objectives of rolling resistance and conductivity, various efforts are still made to ensure conductive paths, despite the increasing use of rubber compounds optimized for rolling resistance. For example, DE10 2010 037 004A1 discloses a vehicle pneumatic tire in which components, as preliminary products, have conductive wires spirally wound around them or thus encased at their peripheral edges for subsequent placement on a build drum. However, this additional process step is cumbersome in the production of the preliminary product.

[0004] The trend also lies in optimizing the rolling resistance of internal components of vehicle pneumatic tires, such as the reinforcing ply of the belt ply assembly, especially the reinforcing ply of the belt ply belt.

[0005] In particular, pneumatic tires for vehicles with a radial design typically have: an impermeable inner layer; a radial carcass, in particular, containing reinforcing elements that extend from the apex region of the tire through the sidewall to the bead region and are typically anchored in the bead region by means of a bead core wrapped around a tension-resistant bead core; a tread patterned tread located radially outward; and a belt ply assembly radially arranged between the tread and the carcass. The radial carcass has reinforcing elements that extend largely radially in the bead region, particularly at an angle of 0° to 8°, preferably 0° to 5°, relative to the radial direction.

[0006] The belt layer assembly has a belt layer that is radially outwardly covered with belt layer bands. The belt layer may have two or more reinforcing element plies that intersect at an angle and are pre-produced as plies and applied to the tire to be formed.

[0007] The belt layer may have one or more reinforcing element plies (preferably one reinforcing element plies) that at least cover the periphery of the belt layer and contain textile reinforcing elements that are parallel to each other and extend substantially in the circumferential direction, particularly at an angle of 0° to 8°, preferably 0° to 5°, relative to the circumferential direction and are embedded in the rubber compound.

[0008] If the reinforcing ply of a tire, particularly a semi-finished belt or strip, has conductive wires on its surface during its production process, these conductive wires may fall off, be damaged, or be cut during the cooling process and during various winding and coiling processes, thus making it impossible to reliably ensure the conductivity of the tire.

[0009] If the discharge resistance of a tire is at most 1 × 10^8 ohms, then the tire can be considered to have sufficient conductivity. The discharge resistance of a vehicle's pneumatic tires can be measured according to ISO 16392:2017. Summary of the Invention

[0010] One objective is to provide a method for producing pneumatic tires for vehicles that has improved processability, allowing the tire, particularly in the area of ​​the belt ply assembly, to have sufficient electrical conductivity. Simultaneously, the belt ply assembly is intended to be designed to have low rolling resistance.

[0011] Another objective is to provide a vehicle pneumatic tire that has sufficient conductivity in the area of ​​the belt layer assembly, and the belt layer assembly of the vehicle pneumatic tire can be designed to have low rolling resistance.

[0012] In contrast to this method, this objective is achieved by a method comprising at least the following steps:

[0013] a) Place the matrix on the construction drum.

[0014] b) The belt layer assembly is constructed onto the prepared tire carcass using at least the following two steps:

[0015] b1) These reinforcing element plies applied to the belt layer assembly, these reinforcing element plies collectively occupying an axial region defined by two axial boundaries within their axial range,

[0016] b2) At least one conductive wire is applied to at least the radially outermost, already constructed component of the tire to be manufactured, for the purpose of constructing the conductive ply.

[0017] The outermost radially constructed component is one of the reinforcing element ply layers of the carcass or the belt ply assembly, and the at least one conductive wire is arranged such that, in each case, the at least one conductive wire repeatedly crosses at at least one of the axial boundaries in the circumferential direction of the belt ply assembly.

[0018] c) Apply tread to the radially outer side of the belt layer assembly.

[0019] d) The tire is further finished by other means.

[0020] This method allows the individual reinforcing element plies of a belt ply assembly to be prefabricated as semi-finished products without additional or altered process steps, and allows them to be applied to tire production. Each reinforcing element ply has multiple reinforcing elements arranged largely parallel to each other and embedded in an elastomeric material. The method for producing a tire includes an additional step b2), in which conductive wires are applied to the radially outermost, pre-constructed component of the tire to be made.

[0021] Depending on whether the outermost radially constructed component is the carcass, the outermost radially reinforcing element ply of the belt ply assembly, or the inner radially reinforcing element ply of the belt ply assembly, step b2) is performed between the application of the two reinforcing element ply layers, before, after, or during step b1).

[0022] The conductive wire is applied only to the build-up drum, allowing upstream processes, particularly the production of semi-finished products, to remain unchanged. Damage to the conductive wire is also avoided before the tire is built. The conductive ply can be formed from at least one conductive wire.

[0023] According to the invention, the conductive wire is applied such that it contacts the radially outermost, pre-constructed component on its radially outer surface. Furthermore, the conductive wire is arranged such that it repeatedly crosses at least one of these axial boundaries over the circumferential extent of the belt ply assembly. Thus, the conductive wire protrudes beyond the axial region and therefore beyond the axial extent of the reinforcing element ply of the belt ply assembly, and there, i.e., axially outside the axial region, contacts at least one additional component of the tire, preferably the tire carcass and / or sidewall. By simply adjusting the axial extent of the wire, the overlap with at least one additional component can be set, and thus the conductive contact can be controlled.

[0024] Conductive wires form conductive connections between the axial region of the belt ply assembly and its axially outer side. This ensures the conductivity of the tire within the belt ply assembly region and improves other properties of the reinforcing element plies of the belt ply assembly, particularly the rubber compound of the reinforcing element plies radially arranged within the conductive plies. Specifically, the rubber compound of one or more reinforcing element plies of the belt ply assembly can be designed to have low rolling resistance, especially for those with insufficient conductivity.

[0025] Repeated crossings of the conductive wires in the circumferential range allow the tire's discharge capacity to be more independent of the tire's position and the interruption of the conductive wires.

[0026] The conductive ply can be formed from at least one conductive wire applied in step b2). Therefore, a conductive ply is provided that provides sufficient conductivity to the tire without requiring additional radial expansion of the tire.

[0027] A method for producing pneumatic tires for vehicles is provided, which has improved processability and allows the tire, particularly in the area of ​​the belt ply assembly, to have sufficient electrical conductivity. Simultaneously, the belt ply assembly can be designed to have low rolling resistance.

[0028] The method according to the invention is explained in more detail below based on advantageous embodiments thereof, but is not limited thereto.

[0029] An advantageous embodiment is provided by the fact that, in step b2), the conductive wire is arranged such that it repeatedly crosses the two axial boundaries of the axial region over the circumferential extent of the belt layer assembly. This allows charge to be released on both axial sides of the axial region. This improves the charge discharge capacity and the reliability of the conductive path.

[0030] Another advantageous embodiment is provided by the fact that, in step b2), the conductive wire is arranged to have turning regions on both sides of the axial boundary with an axial distance from the respective axial boundary, preferably provided by the fact that the conductive wire is arranged to oscillate, and particularly preferably provided by the fact that the wire is arranged to oscillate in a wavy, looped, or zigzag manner. This allows the conductive wire to be applied in a particularly simple manner, such that the conductive wire repeatedly crosses at at least one of the axial boundaries over the circumferential extent of the belt layer assembly.

[0031] The turning areas may have bends or kinks. These turning areas can be arranged to oscillate, preferably in a wavy, loop, or zigzag pattern. If the line is arranged to oscillate in a wavy pattern, the application of the line is particularly simple.

[0032] Another advantageous embodiment is given by the fact that, in step b2), two or more conductive wires are applied at least to the radially outermost, already constructed part of the tire to be made for constructing the conductive ply, wherein the first wire of these conductive wires is arranged such that it repeatedly intersects at at least one of the axial limits in the circumferential range of the belt ply assembly, and the second wire of these conductive wires is arranged such that it repeatedly intersects at at least another axial limit in the circumferential range of the belt ply assembly, preferably given by the fact that at least two of these conductive wires are arranged to repeatedly intersect each other in the circumferential range of the tire.

[0033] Two or more conductive wires in the same conductive fabric layer improve the conductive contact area and thus improve the discharge capacity. The conductive wires can also be arranged to repeatedly cross at both axial boundaries in each case.

[0034] Preferably, the wires are arranged to repeatedly intersect each other over the circumference of the tire. At the intersections, the wires are in conductive contact with each other. This makes the conductive path even more robust than partial interruptions. The intersections can each be located within or outside the axial region.

[0035] In the case of an oscillating arrangement with turning points on both sides of the corresponding axial limit, the lines can be arranged in a manner in which they shift relative to each other and repeatedly intersect each other.

[0036] Two or more conductive wires in the same conductive ply can be continuous wires arranged over more than one rotation of the tire. Alternatively, they can be two or more separate wires.

[0037] Another advantageous embodiment is given by the fact that, in step b2), the conductive wire is wound or coiled. This allows for a particularly simple and reliable production method on the build drum.

[0038] Another advantageous embodiment is given by the fact that in step b2), the radially outermost, already constructed component of the tire to be made is the radially outermost reinforcing element ply of the belt ply assembly or the radially inner reinforcing element ply of the belt ply assembly or the carcass, preferably the radially outermost reinforcing element ply of the belt ply assembly of the tire to be made.

[0039] Advantageous embodiments are given by the fact that, in step b2), the radially outermost, already constructed component of the tire to be manufactured is the radially outermost reinforcing element ply of the belt ply assembly. This is typically the belt ply cord ply, whose textile reinforcing elements are preferably arranged at an angle of 0° to 5° relative to the circumferential direction.

[0040] Therefore, the conductive ply is the outermost radial ply of the belt ply assembly. In this way, at least the outermost radial reinforcing element ply, particularly the rubber compound of the belt ply band, can be designed to have particularly low rolling resistance, while simultaneously ensuring sufficient conductivity from the radially inner side of the tread to other components (such as the sidewall and / or carcass) located on the outer side of the axial region.

[0041] An advantageous embodiment is provided by the fact that, in step b2), the radially outermost, already constructed component of the tire to be manufactured is the radially inner reinforcing element ply of the belt layer assembly. This component can be the reinforcing element ply of the belt layer. A conductive ply is arranged at least partially radially between two radially adjacent reinforcing element plys of the belt layer assembly. The conductive ply arranged in this manner can also release charge from within the belt layer assembly to the axially outer side of the belt layer assembly, and thus positively influence the conductivity of the vehicle's pneumatic tire.

[0042] An advantageous embodiment is provided by the fact that, in step b2), the outermost radially constructed component of the tire to be manufactured is the tire carcass. Therefore, the conductive ply layer is at least partially radially arranged between the reinforcing element ply layer of the belt ply assembly and the tire carcass. This conductive ply layer can also positively influence the conductivity of the vehicle's pneumatic tire.

[0043] Another advantageous embodiment is given by the fact that step b2) is performed two or at least three times, with each round of step b2) taking place in the corresponding radially outermost, already constructed component, to which the conductive wires are applied differently from one another.

[0044] Therefore, the belt layer assembly has two or at least three conductive fabric layers, which in each case are at least partially separated from each other in the radial direction by at least one reinforcing element fabric layer. This further improves the discharge capacity of the belt layer assembly.

[0045] Preferably, two or at least three conductive fabric layers overlap axially outside the axial region. Particularly preferably, the conductive wires of the various conductive fabric layers intersect axially outside the axial region and contact each other conductively, thereby further improving the reliability of conductivity.

[0046] Preferably, in this case, step b2) is performed once after step b1) has been fully performed, so that in this round, the radially outermost, constructed component is the radially outermost reinforcing element cord layer of the belt layer assembly.

[0047] Vehicle pneumatic tires produced by the method according to the invention can be used in passenger vehicles, vans, light trucks, two-wheeled vehicles, or multi-purpose vehicles. The tire is preferably a radial tire.

[0048] Advantageous embodiments are provided by the fact that, in step b2), in addition to the at least one conductive wire, the conductive connecting wire is arranged such that it is largely oriented in the circumferential direction U and repeatedly intersects at least one of the conductive wires over the circumferential extent of the tire, and preferably is arranged entirely axially between the two axial boundaries. The conductive connecting wire can be embodied as a conductive wire in terms of its conductivity, construction, linear density, and / or material composition. The conductive wires and connecting wires of the tire can have the same embodiment. They can alternatively differ from each other.

[0049] At the intersections, the wires come into contact with each other conductively. This makes the conductive path even more robust than a partial interruption. Even in the event of a break in at least one conductive wire, the largely circumferential orientation of the wires and the repeated crossings allow for the most efficient possible distribution and release of charge in the tire.

[0050] In contrast to a vehicle's pneumatic tire, this objective is achieved by a conductive ply layer having at least one conductive wire arranged such that, in each case, the at least one conductive wire repeatedly crosses at at least one axial boundary in the axial limits of the belt layer assembly over the circumferential extent.

[0051] The conductive wire is arranged such that it protrudes beyond the axial extent of the reinforcing element plies of the belt ply assembly and contacts the tire components axially arranged outside the axial region, preferably the tire carcass. Thus, the conductive wire provides a conductive connection from the axial region of the belt ply assembly to its axially outer side. This ensures the conductivity of the tire within the belt ply assembly region while improving other properties of the reinforcing element plies, particularly the rubber compound of the radially arranged reinforcing element plies within the conductive plies. Specifically, the rubber compound of one or more reinforcing element plies in the belt ply assembly can be designed to have low rolling resistance, particularly poor conductivity.

[0052] Repeated crossings of the conductive wires in the circumferential range allow the tire's discharge capacity to be more independent of the tire's position and the interruption of the conductive wires.

[0053] The conductive ply can be formed from at least one conductive wire. Therefore, a conductive ply is provided that enables the tire to have sufficient conductivity without requiring additional radial expansion of the tire.

[0054] A vehicle pneumatic tire is provided that has sufficient conductivity in the region of the belt layer assembly, which can be designed to have low rolling resistance.

[0055] If the conductive wire rests on the belt layer band, it is arranged radially between the belt layer band and the tread. The conductive path can extend from the conductive components of the tread (such as the carbon center beam) to components arranged axially outside the axial region (such as the sidewall or carcass).

[0056] The following explanation of the vehicle pneumatic tire according to the invention is based on advantageous embodiments thereof, but is not limited thereto.

[0057] An advantageous embodiment is provided by the fact that the conductive lines are arranged such that they repeatedly cross at both axial boundaries over the circumferential extent of the belt layer assembly. This allows charge to be released on both axial sides of the axial region. This improves the charge discharge capacity and the reliability of the conductive path.

[0058] Another advantageous embodiment is given by the fact that the conductive wire is arranged to have turning regions on both sides of the axial limit with an axial distance from the corresponding axial limit, preferably given by the fact that the conductive wire is arranged to oscillate, and particularly preferably given by the fact that the wire is arranged to oscillate in a wavy, loop or zigzag form.

[0059] This allows for a particularly simple arrangement in which the conductive lines repeatedly cross at least one axial boundary within the axial limits of the belt layer assembly over the circumferential region. The turning regions may have bends or kinks. These turning regions can be arranged to oscillate, preferably in a wavy, loop, or zigzag pattern. Particularly preferred is that the lines are arranged to oscillate in a wavy pattern.

[0060] Another advantageous embodiment is given by the fact that the conductive ply has two or more conductive wires, the first of which is arranged such that it repeatedly crosses at least one of the axial limits over the circumferential range of the belt ply assembly, and the second of which is arranged such that it repeatedly crosses at least another axial limit over the circumferential range of the belt ply assembly, preferably given by the fact that at least two of the conductive wires are arranged to repeatedly intersect each other over the circumferential range of the tire.

[0061] Two or more wires improve the conductive contact area and thus improve the discharge capacity. The conductive wires can also be arranged to repeatedly cross at both axial boundaries in each case.

[0062] Preferably, the lines are arranged to repeatedly intersect each other. At the intersections, the lines are in conductive contact with each other. This makes the conductive path even more robust than partial interruptions. The intersections can each be located within or outside the axial region.

[0063] In the case of an oscillating arrangement with turning points on both sides of the corresponding axial limit, the lines can be arranged in a manner in which they shift relative to each other and repeatedly intersect each other.

[0064] Two or more conductive wires in the same conductive ply can be continuous wires arranged over more than one rotation of the tire. Alternatively, they can be two or more separate wires.

[0065] Another advantageous embodiment is given by the fact that one of the at least one conductive ply layers is arranged radially from the outside on the outermost radial reinforcing element ply layer of the belt layer assembly, and / or by the fact that one of the at least one conductive ply layers is arranged between the two reinforcing element ply layers of the belt layer assembly, and / or by the fact that one of the at least one conductive ply layers is arranged between the innermost radial reinforcing element ply layer of the belt layer assembly and the tire carcass.

[0066] Therefore, the belt layer assembly may have exactly one conductive ply layer, which is arranged radially from the outside on the outermost radially reinforcing element ply layer of the belt layer assembly, or between two reinforcing element ply layers of the belt layer assembly, or between the innermost radially reinforcing element ply layer of the belt layer assembly and the tire carcass. Preferably, the conductive ply layer is arranged radially from the outside on the outermost radially reinforcing element ply layer, which is typically the belt layer hoop ply layer.

[0067] The belt layer assembly may alternatively have two or at least three conductive fabric layers. Preferably, in this case, at least one of the conductive fabric layers is arranged radially from the outside onto the radially outermost reinforcing element fabric layer, which is typically the belt layer hoop fabric layer.

[0068] Therefore, the belt layer assembly has two or at least three conductive fabric layers, which are separated from each other in the radial direction by at least one reinforcing element fabric layer in each case. This further improves the discharge capacity of the belt layer assembly.

[0069] Preferably, two or at least three conductive fabric layers overlap axially in the radial direction outside the axial region. Particularly preferably, the conductive lines of the various conductive fabric layers intersect axially outside the axial region and contact each other conductively, thereby further improving the reliability of conductivity.

[0070] Advantageous embodiments are provided by the fact that the conductive ply has conductive connecting wires arranged such that the connecting wires are largely oriented in the circumferential direction U and repeatedly intersect at least one of these conductive wires over the circumferential extent of the tire, and preferably arranged entirely axially between these two axial boundaries. The conductive connecting wires can be embodied as conductive wires in terms of their conductivity, construction, linear density, and / or material composition. The conductive wires and connecting wires of the tire can have the same embodiment. They can alternatively differ from each other.

[0071] At the intersections, the wires come into contact with each other conductively. This makes the conductive path even more robust than a partial interruption. Even in the event of a break in at least one conductive wire, the largely circumferential orientation of the wires and the repeated crossings allow for the most efficient possible distribution and release of charge in the tire.

[0072] The pneumatic tires for vehicles according to the present invention can be produced by the method according to the present invention.

[0073] Vehicle pneumatic tires can be used for passenger cars, vans, light trucks, two-wheeled vehicles, or multi-purpose vehicles, or they can be industrial or agricultural tires. Preferably, the tire has a radial design.

[0074] The method according to the invention and advantageous embodiments of the vehicle pneumatic tire according to the invention are explained in more detail below, but are not limited thereto.

[0075] Advantageous embodiments are given by the fact that the conductive wire has a resistance of up to 6.5 × 10^6 ohms / 30 cm. The resistance of the conductive wire can be measured at a temperature of 22°C ± 1°C and a humidity of 55% ± 5%. This conductive wire can be used to achieve sufficient discharge capacity in the belt layer assembly.

[0076] Another advantageous embodiment is given by the fact that the conductive wire is a textile thread, which preferably comprises filaments made of PES or PA, particularly preferably filaments made of PET or PA 6.6, and is formed by impregnation with a conductive adhesive.

[0077] Such textile reinforcing elements, including conductive adhesive impregnation, are ideally suited for use as conductive wires. The adhesive impregnation ensures a simple and permanent attachment of the wire to the surrounding rubber compound. Conductive adhesive impregnation allows for the advantageous use of textile wires that may inherently have relatively low conductivity in terms of cost and process.

[0078] To ensure that the conductive adhesive impregnation of the textile yarn has sufficient conductivity, the adhesive impregnation may contain a sufficient amount of carbon black. The conductive adhesive impregnation may, for example, contain at least 20%, preferably at least 25%, and particularly preferably at least 30% carbon black as a solution content.

[0079] The properties of textile yarns can be optimized by selecting textile materials and construction.

[0080] The textile yarn contains or is formed from polymers. The textile yarn may contain polyamide (PA), preferably PA6.6, PA6, or PA4.6, or be formed from them. The textile yarn may contain polyester, preferably polyethylene terephthalate (PET), or be formed from them.

[0081] For the purpose of improving sustainability, at least one polymer of textile yarn, preferably PA and / or PES, particularly PA6.6 and / or PA4.6 and / or PET, can be wholly or partially recycled polymers. In the context of this invention, the expression "recycled polymer" means a polymer obtained by at least one recycling method. This recycling method can be any of those known to those skilled in the art, particularly chemical and / or mechanical recycling. The polymer of textile yarn can alternatively be wholly or partially formed from a non-recycled (original) polymer.

[0082] For the purpose of improving sustainability, at least one polymer of textile yarn, preferably PA and / or PES, particularly PA6.6 and / or PA4.6 and / or PET, can be wholly or partially bio-based polymers. In the context of this invention, the term "bio-based polymer" means a polymer that is physically formed wholly or at least partially from monomers derived from biomass. As is known to those skilled in the art, the proportion of bio-based material in a polymer, i.e., the proportion derived from renewable raw materials, can be determined according to ASTM D 6866 (method C-14). The polymer can alternatively be formed as a non-bio-based polymer, meaning that in the context of this invention, no starting monomers are directly and physically obtained from biomass. This polymer can be conventional, particularly mineral oil-based, polymers.

[0083] A textile thread can be composed of exactly one textile material. Alternatively, a textile thread can be a blended textile thread containing different textile materials. A textile thread can be formed from multifilament yarns. Textile reinforcing elements can alternatively be formed from multiple multifilament yarns twisted together at their ends. A textile thread can alternatively be formed from monofilaments or from at least two monofilaments twisted together.

[0084] Another advantageous embodiment is given by the fact that the textile yarn has a linear density of 50 to 500 dtex, preferably 75 to 450 dtex, and particularly preferably 100 to 400 dtex. This low linear density allows the conductive wire to have sufficient robustness to prevent damage. At the same time, the relatively thin conductive wire has little impact on the mechanical properties of the tire.

[0085] Another advantageous embodiment is given by the fact that the conductive wire comprises one or more conductive metal filaments. The conductivity of the conductive wire comprising one or more conductive metal filaments may then be primarily due to the conductive metal filaments.

[0086] A conductive wire, which includes one or more conductive metal filaments, can be formed from one or more conductive metal filaments.

[0087] A conductive wire comprising one or more conductive metal filaments may alternatively comprise at least one filament, particularly a multifilament yarn, wherein the at least one filament is composed of a textile material, preferably PES or PA, and particularly preferably PET, PA6.6 or PA4.6.

[0088] Another advantageous embodiment is given by the fact that the conductive wire comprises carbon fiber. Carbon fiber has advantageously high conductivity and advantageously high strength. The conductivity of the conductive wire is then likely primarily due to the conductive carbon fiber. The cumbersome additional impregnation of the conductive wire with conductive adhesive to ensure sufficient conductivity can be avoided. The conductive wire can be formed without adhesive impregnation. Simultaneously, the excellent strength properties of carbon fiber prevent damage and potential tearing of the conductive wire and associated interruptions to the conductive path during the winding process on construction machinery. Compared to textile materials such as PET or PA6.6, carbon fiber also has the advantage of lower moisture absorption, thereby reducing air entrainment due to moisture evaporation.

[0089] Preferably, the conductive wire containing carbon fibers is formed entirely of carbon fibers. Due to the carbon fibers, the conductive wire has advantageous conductivity and strength to a particularly high degree.

[0090] Conductive wires containing carbon fibers can alternatively comprise at least one filament, particularly a multifilament yarn, which is made of a textile material, preferably PES or PA, and particularly preferably PET, PA6.6, or PA4.6. In the case of such hybrid wires, the advantageous properties of the different materials and / or the advantageous properties of the wire construction are combined with each other.

[0091] Advantageous embodiments of conductive wires incorporating carbon fibers are given by the fact that these conductive wires have a linear density of 100 dtex to 800 dtex, preferably 200 dtex to 700 dtex, and particularly preferably 300 dtex to 700 dtex. This low linear density allows the conductive wire to have sufficient robustness to prevent damage. At the same time, the relatively thin conductive wire has little impact on the mechanical properties of the tire.

[0092] This invention covers all advantageous configurations, particularly those reflected in the claims. It also covers configurations resulting from combinations of different features, wherein these features have different levels of preference, and therefore the invention also covers combinations of a first feature described as “preferred” with another feature described, for example, as “particularly preferred.” Attached Figure Description

[0093] Further features, advantages, and details of the invention will be explained in more detail with reference to the illustrative drawings illustrating exemplary embodiments. In the drawings:

[0094] Figures 1 to 3The cross-section of the tire to be constructed at each stage of the method is shown;

[0095] Figures 4 to 6 Each shows a top view of the tire to be constructed according to step b2);

[0096] Figure 7 A vehicle pneumatic tire according to the present invention is shown.

[0097] List of reference numerals

[0098] 1. Vehicle pneumatic tires

[0099] 2. Fetal body

[0100] 3 Belt layer assembly

[0101] 4. Radial inner reinforcing element ply of the belt layer assembly

[0102] 5. Outermost radial reinforcing element ply of the belt layer assembly

[0103] 6. 6' Conductive fabric layer

[0104] 7. Constructing the drum

[0105] 8 Axial Limits

[0106] 9 Axial region

[0107] 10", 10'", 10" conductive wire

[0108] 11 Tread

[0109] 12 Carbon Center Beam

[0110] 13. Sidewall

[0111] 14 Turning Area

[0112] 15 Intersections

[0113] 101 connecting cable

[0114] aR Axial direction

[0115] rR radial direction Detailed Implementation

[0116] Figures 1 to 3 The diagram shows a cross-section of a tire to be constructed at various stages of a method for producing a pneumatic tire 1 for a vehicle having a carcass 2 and a belt ply assembly 3, the belt ply assembly 3 having a plurality of reinforcing element plies 4, 5 and at least one conductive ply 6.

[0117] exist Figure 1In the process, steps a) and b1) have been performed. According to step a), the tire carcass 2 is placed on the construction drum 7. According to step b1), the reinforcing element ply layers 4 and 5 of the not-yet-complete belt layer assembly 3 are applied to the placed tire carcass 2. The reinforcing element ply layers 4 and 5 together occupy an axial region 9 defined by two axial boundaries 8 within their axial range. For example, the belt layer assembly 3 that is not yet complete through the conductive ply layer (see...) Figure 2 It has two reinforcing element ply layers 4 that intersect at an angle and are covered by the radially outermost reinforcing element ply layer 5, in which case the radially outermost reinforcing element ply layer is a belt layer hoop ply layer that at least covers the periphery of the angled ply layer 4.

[0118] Figure 2 The construction process according to step b2) is illustrated, wherein, in order to complete the belt layer assembly 3, conductive wire 10 has been applied to at least the radially outermost, already constructed component (in this case, the belt layer hoop ply 5) of the tire to be manufactured for constructing the conductive ply 6. The conductive wire 10 is arranged such that, over the circumferential extent of the belt layer assembly, the conductive wire repeatedly crosses at at least one of the axial boundaries 8 (in this case, for example, at both axial boundaries 8). The conductive wire 10 may have been wound or coiled in step b2).

[0119] exist Figure 3 In step c), the tread 11 has been applied to the radially outer side of the belt ply assembly 3. The tread 11 has a carbon center beam 12, which forms a conductive connection between the tire tread surface and the conductive ply 6. Furthermore, in... Figure 3 Sidewall 13 has already been applied. Further finishing of the tire by other means includes, for example, applying additional components such as sidewall 13 (in...). Figure 3 (Already implemented in China) and final vulcanization.

[0120] The conductive ply 6 contacts other components, such as the carcass 2 and sidewall 13, on the axially outer side of the axial region 9. A conductive connection can be established between the conductive ply 6 and the bead region.

[0121] Figures 1 to 7The components shown can be formed as follows: conductive wires 10, 10', 10” and conductive connecting wire 101 each have a resistance of up to 6.5 × 10^6 ohms / 30 cm. The resistance can be measured at a temperature of 22°C + / - 1°C and a humidity of 55% + / - 5%. In each case, wires 10, 10', 10”, and 101 can be textile threads, preferably comprising filaments made of PES or PA, particularly preferably comprising filaments made of PET or PA6.6, which are formed by impregnation with a conductive adhesive. Textile threads 10, 10', 10”, and 101 can have a linear density of 50 dtex to 500 dtex, preferably 75 dtex to 450 dtex, and particularly preferably 100 dtex to 400 dtex. Wires 10, 10', 10”, and 101 can comprise one or more conductive metal filaments or can be formed from one or more conductive metal filaments. The conductive wires 10, 10', and 10" may contain carbon fibers. The conductive wires may be formed wholly or partially from carbon fibers. The conductive wires containing carbon fibers may have a linear density of 100 dtex to 800 dtex, preferably 200 dtex to 700 dtex, and particularly preferably 300 dtex to 700 dtex. The conductive wires may be formed without adhesive impregnation.

[0122] All conductive wires 10, 10', 10” and conductive connecting wires 101 of the tire can have the same design.

[0123] The vehicle pneumatic tire 1 can be used for passenger cars, vans, light trucks, two-wheeled vehicles, or multi-purpose vehicles, or it can be an industrial tire or an agricultural tire. The tire is preferably a radial tire.

[0124] Figure 4 , Figure 5 and Figure 6 Different variations of the conductive cord layer 6 are shown. In each case, a top view of the tire component already constructed according to step b2) is presented. In step b2), the conductive wires 10, 10' are arranged in such a way that the conductive wires have turning regions 14 on both sides of the respective axial boundary 8, with an axial distance from the respective axial boundary 8. Figure 4 , Figure 5 and Figure 6 In the circuit, lines 10 and 10' are arranged to oscillate in a wavy manner. Alternatively, an arrangement in a loop or zigzag pattern is also possible. At the intersection 15 of the conductive lines 10 and 10' with the connecting line 101, the lines are in conductive contact with each other.

[0125] Figure 4A top view of the constructed tire component according to step b2) is shown. The radially outermost, constructed component of the tire to be manufactured is, for example, the radially outermost reinforcing element ply 5 (shown in shaded lines), particularly the belt ply. This tire component can be... Figure 2 The structure shown. The conductive wire 10 is arranged such that it repeatedly crosses the two axial boundaries 8 of the axial region 9 in the circumferential range of the belt layer assembly. In step b2), the conductive connecting wire 101 is further arranged such that it is oriented at an angle of 0° to 8°, preferably 0° to at most 5°, in the circumferential direction U, particularly relative to the circumferential direction U, and repeatedly intersects the conductive wire 10 in a conductive contact manner in the circumferential range of the tire at the intersection point 15, and is arranged completely axially between the two axial boundaries 8.

[0126] Figure 5 A top view of a constructed tire component according to an alternative embodiment of step b2) is shown. Here, in step b2), at least two or more conductive wires 10, 10' are applied to the radially outermost, constructed component of the tire to be manufactured (in this case, for example, the radially inner reinforcing element ply 4 of the belt ply assembly 3 to be manufactured (shown in shaded lines)) to construct a conductive ply 6. The first wire 10 of the conductive wires is arranged such that it repeatedly crosses at least one of the axial boundaries 8 in the circumferential range of the belt ply assembly 3, and the second wire 10' of the conductive wires is arranged such that it repeatedly crosses at at least another axial boundary 8 in the circumferential range of the belt ply assembly. Thus, the conductive ply 6 constructed in this way is formed by two conductive wires 10, 10'. The two conductive wires 10, 10' are arranged to repeatedly intersect each other at intersection 15 and to be in conductive contact with each other. In the illustrated embodiment, lines 10, 10' intersect at one of the axial boundaries 8 in each case. In the illustrated case, step b2) is performed between the two reinforcing element plies of the belt layer assembly during step b1).

[0127] Figure 6Another embodiment of the method is shown. The diagram shows a top view of the constructed tire component if step b2) is performed twice, with each round of step b2) performed on the corresponding radially outermost constructed component, to which conductive lines 10, 10” are applied differently. In the first round of step b2), the radially inner reinforcing element ply 4 of the belt layer assembly 3 (shown in discontinuous shading) is the radially outermost constructed component to which conductive line 10 is applied. Subsequently, according to step b1), at least one remaining reinforcing element ply 5 of the belt layer assembly (shown in shading) is applied. Then, in the second round of step b2), another conductive line 10” is applied, in this case, the radially outermost constructed component is the radially outermost reinforcing element ply 5 of the belt layer assembly to be manufactured. The conductive lines 10, 10” are arranged such that, circumferentially, they each repeatedly cross at the two axial boundaries 8 of the axial region 9. Therefore, the belt layer assembly has two conductive plies 6, 6' that axially overlap outside the axial region 9. The conductive lines 10 of the conductive plies 6 and 10” of the conductive plies 6' are in conductive contact with each other outside the axial region 9. The conductive lines 10 of the conductive plies 6 are radially arranged, at least in some portions, between the reinforcing element plies 4 and 5.

[0128] Figure 7 A schematic cross-section of a vehicle pneumatic tire 1 according to the invention is shown. The vehicle pneumatic tire 1 has: an impermeable inner layer (not shown); a radial carcass 2, in particular, which includes reinforcing elements and extends from the apex region of the tire through the sidewall to the bead region and is generally anchored in the bead region by surrounding a tension-resistant bead core; a patterned tread 11 located radially outward; and a belt layer assembly 3, which is radially arranged between the tread 11 and the carcass 2 and rests on the carcass. The radial carcass has reinforcing elements that extend largely radially in the bead region, particularly at an angle of 0° to 8°, preferably 0° to 5°, relative to the radial direction.

[0129] The belt layer assembly 3 has a belt layer comprising: a plurality of reinforcing element plies 4, which are arranged at an angle of at least 15° relative to the circumferential direction; a radially outermost reinforcing element plies 5, which are formed in particular as belt layer hoop plies; and, in the illustrated exemplary embodiment, at least one conductive plies 6 that radially contacts the radially outermost reinforcing element plies 5 from the outside. The reinforcing element plies 4 and 5 together occupy an axial region 9 defined by two axial boundaries 8 in their axial direction. The conductive plies 6 are formed by at least one conductive wire 10. The conductive wire is arranged such that it repeatedly crosses at at least one of the axial boundaries 8 in the circumferential direction of the belt layer assembly 3.

[0130] For example, the tread 11 has a carbon center beam 12, which forms a conductive connection between the tread surface of the tire and the conductive ply 6.

[0131] Vehicle pneumatic tire 1 can have according to Figure 4 or Figure 5 The conductive cord layer 6 is shown. The vehicle's pneumatic tire 1 may also have two conductive cord layers 6, 6' (not shown), which, for example, are based on... Figure 6 This is to be reflected. The vehicle's pneumatic tire 1 can be... Figures 1 to 3 as well as Figure 4 , Figure 5 and / or Figure 6 The method shown is for production according to the present invention.

Claims

1. A method for producing a vehicle pneumatic tire (1) having a carcass (2) and a belt ply assembly (3), the belt ply assembly (3) having a plurality of reinforcing element plies (4, 5) and at least one conductive ply (6), the method comprising at least the following steps: a) Place the body (2) on the construction drum (7), b) The belt layer assembly (3) is constructed on the prepared carcass (2) by at least the following two steps: b1) The reinforcing element plies (4, 5) of the belt layer assembly are applied, and these reinforcing element plies collectively occupy an axial region (9) defined by two axial boundaries (8) in their axial direction. b2) At least one conductive wire (10, 10', 10”) is applied to at least the radially outermost, already constructed component of the tire to be manufactured for constructing the conductive ply (6, 6'). The outermost radially constructed component is one of the reinforcing element ply layers (4, 5) of the carcass (2) or the belt ply assembly (3), and The at least one conductive wire (10, 10', 10”) is arranged such that, in each case, the at least one conductive wire repeatedly crosses at at least one of the axial boundaries (8) over the circumferential extent of the belt layer assembly (3). c) Apply tread (11) to the radial outer side of the belt layer assembly (3), d) The tire (1) is finished by other means.

2. The method as described in claim 1, characterized in that, In step b2), the conductive lines (10, 10', 10”) are arranged such that they repeatedly cross at the two axial boundaries (8) of the axial region (9) over the circumferential range of the belt layer assembly (3).

3. The method as described in at least one of the preceding claims, characterized in that, In step b2), the conductive lines (10, 10', 10”) are arranged to have turning regions (14) on both sides of the axial boundary (8), preferably, characterized in that the conductive lines are arranged to oscillate, particularly preferably, characterized in that the lines are arranged to oscillate in a wavy, loop or zigzag form.

4. The method as described in at least one of the preceding claims, characterized in that, In step b2), two or more conductive wires (10, 10') are applied at least to the outermost radially constructed component of the tire to be manufactured to construct the conductive ply (6). The first line (10) of these conductive lines is arranged such that it repeatedly crosses at least one of the axial boundaries (8) over the circumferential extent of the belt layer assembly (3), and the second line (10') of these conductive lines is arranged such that it repeatedly crosses at least another axial boundary (8) over the circumferential extent of the belt layer assembly. Preferably, at least two of these conductive wires are arranged to repeatedly intersect each other over the circumferential range of the tire.

5. The method as described in at least one of the preceding claims, characterized in that, In step b2), the outermost radially constructed component of the tire to be manufactured is the outermost radially reinforcing element ply (5) of the belt ply assembly (3) or the inner radially reinforcing element ply (4) of the belt ply assembly (3) or the tire carcass (2), preferably the outermost radially reinforcing element ply of the belt ply assembly of the tire to be manufactured.

6. The method as described in at least one of the preceding claims, characterized in that, Step b2) is performed two or at least three times, with each round of step b2) taking place in the corresponding radially outermost, already constructed component, and the corresponding conductive lines (10, 10”) are applied to the component differently from each other.

7. The method as described in at least one of the preceding claims, characterized in that, In step b2), in addition to the at least one conductive wire (10, 10', 10”), the conductive connecting wire (101) is arranged such that the conductive connecting wire is oriented largely in the circumferential direction U and repeatedly intersects at least one of the conductive wires (10, 10', 10”) in the circumferential range of the tire, and preferably is arranged completely axially between the two axial boundaries (8).

8. A vehicle pneumatic tire (1) having a carcass (2), a belt ply assembly (3) applied radially to the carcass from the outside, and a tread (11), the belt ply assembly (3) having a plurality of reinforcing element plies (4, 5) and at least one conductive ply (6, 6') contacting at least one of the reinforcing element plies (4, 5), and the reinforcing element plies (4, 5) collectively occupying an axial region (9) defined by two axial boundaries (8) in their axial direction, characterized in that, The conductive fabric layer (6, 6') has at least one conductive wire (10, 10', 10”), which is arranged such that, in each case, the at least one conductive wire repeatedly crosses at at least one of the axial boundaries (8) over the circumferential range of the belt layer assembly (3).

9. The vehicle pneumatic tire (1) as claimed in the preceding claims, characterized in that, The conductive lines (10, 10', 10") are arranged such that they repeatedly cross at the two axial boundaries (8) over the circumferential extent of the belt layer assembly (3).

10. The vehicle pneumatic tire (1) as claimed in any one of claims 8 and 9, characterized in that, The conductive lines (10, 10', 10”) are arranged to have turning regions (14) on both sides of the axial boundary (8) with an axial distance from the corresponding axial boundary (8). Preferably, the conductive lines (10, 10', 10”) are arranged to oscillate. More preferably, the lines are arranged to oscillate in a wavy, loop, or zigzag manner.

11. The vehicle pneumatic tire (1) as described in any one of claims 8 to 10, characterized in that, The conductive fabric layer (6) has two or more conductive wires (10, 10'), wherein the first wire (10) is arranged such that it repeatedly crosses at least one of the axial boundaries (8) over the circumferential extent of the belt layer assembly, and the second wire (10') is arranged such that it repeatedly crosses at least another axial boundary (8) over the circumferential extent of the belt layer assembly. Preferably, at least two of these conductive wires (10, 10') are arranged to repeatedly intersect each other over the circumferential range of the tire.

12. The vehicle pneumatic tire (1) as described in any one of claims 8 to 11, characterized in that, One of the at least one conductive fabric layers (6, 6') is arranged radially from the outside on the outermost radial reinforcing element fabric layer (5) of the belt layer assembly (3). And / or characterized in that one of the at least one conductive ply layers (6) is disposed between the two reinforcing element ply layers (4, 5) of the belt layer assembly, and / or characterized in that one of the at least one conductive ply layers is disposed between the radially innermost reinforcing element ply layer (4) of the belt layer assembly and the tire carcass (2).

13. The vehicle pneumatic tire as described in at least one of claims 8 to 12, characterized in that, The conductive ply (6) has a conductive connecting line (101) arranged such that the conductive connecting line is oriented in the circumferential direction U to a large extent and repeatedly intersects at least one of the conductive lines (10, 10', 10") in the circumferential range of the tire, and preferably is arranged axially between the two axial boundaries (8).

14. The method as described in at least one of claims 1 to 7, and / or The vehicle pneumatic tire as described in at least one of claims 8 to 13 is characterized in that, The conductive wire (10, 10', 10”) has a resistance of up to 6.5 × 10^6 ohms / 30 cm.

15. The method as described in at least one of claims 1 to 7 and 14, and / or The vehicle pneumatic tire as described in at least one of claims 8 to 14 is characterized in that, The conductive wire (10, 10', 10") is a textile thread, which preferably comprises filaments made of polyester (PES) or polyamide (PA), particularly preferably comprises filaments made of polyethylene terephthalate (PET) or PA6.6, and is characterized in that the textile thread is formed by impregnation with a conductive adhesive.

16. The method as claimed in claims 1 to 7 and at least one of claims 14 and 15 and / or the vehicle pneumatic tire as claimed in claims 8 to 15. Its features are, The textile yarn (10, 10', 10") has a linear density of 50 to 500 dtex, preferably 75 to 450 dtex, and particularly preferably 100 to 400 dtex.

17. The method as described in at least one of claims 1 to 7 and 14 to 16 and / or the vehicle pneumatic tire as described in at least one of claims 8 to 16. Its features are, The conductive line (10, 10', 10") comprises one or more conductive metal filaments.

18. The method according to at least one of claims 1 to 7 and 14 and / or the vehicle pneumatic tire according to at least one of claims 8 to 14, Its features are, The conductive wire (10, 10', 10") comprises or is formed of carbon fiber, and particularly has a linear density of 100 dtex to 800 dtex, preferably 200 dtex to 700 dtex, and especially preferably 300 dtex to 700 dtex.

Images