Pneumatic vehicle tires with reinforcement layer

Abstract

The present invention relates to a pneumatic vehicle tire, wherein the bandage ply reinforcement has a multifilament yarn made of PA6.6 with a fineness of 100 dtex to 1500 dtex, the raw yarn having a fineness-related maximum tensile strength greater than 87 cN / tex and a heat shrinkage rate greater than 6%, the carcass ply reinforcement includes a multifilament yarn made of PET with a fineness of 50 dtex to 2500 dtex, the raw yarn having a fineness-related maximum tensile strength of ≥70 cN / tex and a heat shrinkage rate of less than 8%, and the belt ply reinforcement includes a steel filament having a tensile strength of 3000 N / mm² to 4100 N / mm² and a carbon content of 0.79 wt% to 1.10 wt%. Such a pneumatic vehicle tire, having further improved rolling resistance, is still robust enough to withstand certain stresses such as improper use.

Description

Technical Field

[0001] The present invention relates to a pneumatic vehicle tire having a carcass with carcass plies, a belt disposed radially outward of the carcass and having belt plies, and a belt bandage on the belt from the radially outer side and having bandage plies. The carcass plies, belt plies, and bandage plies each have strength members embedded in a rubber material in a manner parallel and spaced apart from each other within each ply. The strength members of the bandage plies are each a fabric strength member formed from at least one multifilament yarn made of polyamide 6.6 (PA6.6). The strength members of the carcass plies are fabric strength members, each formed from at least one multifilament yarn made of polyethylene terephthalate (PET), and the strength members of the belt plies are each formed from at least one steel filament.

Background Art

[0002] Reinforcing plies for pneumatic vehicle tires, such as carcass plies, belt plies, and / or bandage plies, are extremely important and generally known to those skilled in the art. The reinforcing plies have a number of reinforced filamentary elements called strength members. The strength members are completely embedded in an elastomeric material, for example, by calendering. The strength members of these reinforcing plies have, for example, the form of a fabric or a continuously coiled strength member treated by calendering.

[0003] A rubber-drawn reinforcing ply of appropriate size and design is joined to further components to form a pneumatic vehicle tire. In a pneumatic vehicle tire, the reinforcing ply reinforces each component of the tire. At the same time, the pneumatic vehicle tire is intended to be improved with respect to further boundary conditions, such as low rolling resistance. This can be achieved by using relatively thin and high-strength reinforcing plies.

[0004] However, reinforcing plies still have to meet stringent requirements, depending on the function of each component of the pneumatic vehicle tire. Particularly in high-stress areas, the interaction of reinforcing plies of different components of the tire should be considered to ensure sufficient technical properties of the entire tire. For example, in the crown region of a pneumatic vehicle tire, where the reinforcing plies of the carcass, belt, and belt bandage are arranged to overlap at least partially, it is necessary not only to consider the required technical properties of each individual component, but also to ensure the strength and robustness of the entire crown region.

[0005] It is known and practiced to provide sufficient thickness in the crown region of pneumatic vehicle tires to ensure their strength and robustness, and to guarantee their strength and robustness against abnormal loads such as driving over obstacles. However, this then negatively affects other characteristics, such as low rolling resistance.

[0006] In particular, radially designed pneumatic vehicle tires generally have a carcass comprising at least one carcass ply, which extends from the apex region of the tire through the sidewall into the bead region and is typically secured thereby by wrapping around a tensile bead core, a shaped tread located radially outward from the carcass, and a belt positioned between the tread and the carcass, which typically has at least two belt plies, and also include a belt bandage located on the radially outward belt, covering at least the belt edge, and having at least one bandage ply. In radially designed tires, the carcass is in the form of a radial carcass, and all or part of the strength members of the radial carcass extend substantially radially in the sidewall region.

[0007] In this application, the direction of "approximately" means making an angle of 0° to 8° with respect to a specific direction.

[0008] The carcass's structural members, particularly those in radial carcasses, must exhibit sufficient strength to withstand the forces generated during tire operation and to be durable. In particular, the carcass resists the internal pressure of the tire. Driving behavior, especially at high speeds, is further positively influenced by the high modulus of elasticity of the carcass's structural members, with elongation of approximately 2% to 4%. In addition, during tire manufacturing, the carcass's reinforcing plies are intended to allow sufficient expansion during manufacturing and within the vulcanization mold, enabling accurate tire formation. Furthermore, the carcass's structural members are intended to have high ultimate tensile strength and high elongation at break to enhance the tire's long-term durability and provide improved resistance to forced elongation, for example, when passing through potholes.

[0009] The belt bandage plays a role in limiting tire inflation caused by centrifugal force generated during driving, especially at high speeds. The reinforcing members of at least one bandage ply of the belt bandage extend substantially circumferentially. During tire manufacturing, at least one bandage ply of the belt bandage is applied in the form of a ply, strip, or individual reinforcing member having a reinforcing member embedded in the unvulcanized rubber mixture and wrapped around the belt or coiled. The reinforcing members of the belt bandage are intended to allow sufficient inflation during the molding stage and in the vulcanization mold during tire manufacturing so that the tire can be accurately formed, and also to ensure good high-speed performance during driving once the tire is completed. To meet these requirements, the reinforcing members should have sufficient elongation at break for tire manufacturing, be able to stretch to about 3% to 4% elongation with moderate force, and require very high force to be able to stretch to greater elongation.

[0010] A belt generally has at least two belt plies arranged so that they intersect at a certain angle. The belt improves the longitudinal and lateral rigidity of the tread. During driving, it helps in power transmission, improves lateral control, and reduces tire wear.

[0011] In the case of belt bandages, efforts have also been made to further improve the properties of the components. Accordingly, European Patent Publication No. 3254870A1 and European Patent Publication No. 3254871A1 disclose reinforcing plies for belt bandages, the reinforcing members comprising at least one multifilament yarn made of polyamide 6.6, the yarn made of polyamide 6.6 having a yarn strength in the range of 1.35 cN / dtex to 1.60 cN / dtex at 4% elongation, and the reinforcing members having a yarn strength in a favorable range at 4% elongation. Reinforcing plies that can be embodied in a relatively thin manner have an elastic modulus that is favorable for use in belt bandages and are more resistant to compressive and bending fatigue stresses.

[0012] Efforts to make the carcass ply / ply of a carcass as thin as possible by using a high-strength PET reinforcing member are known from European Patent Application Publication No. 3493999A1. That document discloses a carcass ply having a cord made from two twisted multifilament yarns of PET as the reinforcing member, where the PET yarn has an ultimate tensile strength of more than 70 cN / tex based on sufficient linear density for the carcass and a heat shrinkage of less than 4%.

[0013] European Patent Application Publication No. 3544826A1 specifies a strength member with a load capacity of 3080 N / mm². 2 ~4190N / mm 2 The invention discloses a belt ply comprising steel filaments having a tensile strength of 3000 N / mm². German Patent Application Publication No. 102019218723A1 discloses a belt ply comprising steel filaments of the same diameter. 2 ~4000N / mm 2 The present invention discloses a belt ply having a 1+2 structured steel cord made from three steel filaments having a tensile strength.

[0014] This trend is toward further improving the environmental friendliness of rubber products, particularly rolling resistance, by optimizing the reinforcing plies / plies of the components of rubber products. A reduction in energy consumption during deformation of tire components during operation can be achieved as a result of a deliberate reduction in the linear density or diameter of the strength members of the reinforcing plies, and as a result of a corresponding reduction in the thickness of the reinforcing plies. However, such optimization of reinforcing plies will impair other properties, such as the robustness of the components. When several components of a tire are intended to contribute to optimization, the interaction of the individual optimized components, particularly in stressed areas of the tire, should also be considered. This relates, for example, to the crown region where different components, particularly the reinforcing plies of the carcass, belt, and belt bandage, interact. Furthermore, the tire as a whole is also intended to be robust against certain stresses that may result from improper use, such as driving with reduced air pressure or overload. [Overview of the Initiative] [Problems that the invention aims to solve]

[0015] Therefore, the main objective of the present invention was to provide a pneumatic vehicle tire that exhibits further improved rolling resistance while maintaining sufficient robustness against certain stresses, such as improper use. [Means for solving the problem]

[0016] This objective is achieved by a pneumatic vehicle tire according to the features of claim 1.

[0017] The pneumatic vehicle tire according to the present invention is characterized in that the multifilament yarn made of PA6.6 has a linear density of 100 dtex to 1500 dtex, the raw yarn made of PA6.6 of the multifilament yarn made of PA6.6 has an ultimate tensile strength based on a linear density of more than 87 cN / tex as measured according to ASTM D885, and a thermal shrinkage of more than 6% as measured with an exposure time of 2 minutes under a preload of 0.05 cN / dtex at 180°C.

[0018] The pneumatic vehicle tire according to the present invention is also characterized in that the PET multifilament yarn has a linear density of 50 dtex to 2500 dtex, the PET filament yarn of the PET multifilament yarn has an ultimate tensile strength based on a linear density of ≥70 cN / tex as measured according to ASTM D885, and a thermal shrinkage of less than 8% as measured with an exposure time of 2 minutes under a preload of 0.01 cN / dtex at 180°C.

[0019] The pneumatic vehicle tire according to the present invention is also characterized in that the steel filament has a tensile strength of 3000 N / mm² to 4100 N / mm² as measured according to ASTM D2969, and a carbon content of 0.79% to 1.10% by weight. [Modes for carrying out the invention]

[0020] "Raw yarn" refers to multifilament yarn that has been spun without any twisting and therefore has not yet been heat-stretched or impregnated.

[0021] "Textile strength member" means a strength member made of one, two, or more multifilament yarns made of a textile material, such as PA6.6 or PET, where one or more multifilament yarns have or have already undergone a heat-stretching process including impregnation and twisting. In the case of a textile strength member made from two or more multifilament yarns, the two or more multifilament yarns may be end-twisted to form a cord.

[0022] Physical measurements, particularly those of the woven strength members and / or the multifilament yarns of the woven strength members and / or the yarns of the multifilament yarns and / or the steel strength members and / or the steel filaments of the steel strength members, may be determined before the respective strength members are embedded in each strength member ply of the pneumatic vehicle tire.

[0023] The ultimate tensile strength based on the linear density of the raw yarn or fabric strength member, and the yarn strength at 4% elongation of the raw yarn or fabric strength member, are measured in accordance with ASTM D885, respectively.

[0024] The thermal shrinkage rate of the raw yarn or fabric strength member is measured in each case with an exposure time of 2 minutes under a preload at 180°C. For PET, the preload is 0.01 cN / dtex. For PA6.6, the preload is 0.05 cN / dtex.

[0025] The tensile strength of the steel filament is determined in accordance with ASTM D2969.

[0026] Surprisingly, specifically as a result of the intentional combination of the above-mentioned reinforcing ply and the high-strength member, a tire has been found to be available that has a reinforcing ply that can be embodied in a relatively thin manner for different components such as carcass, belt bandage, and belt, while maintaining sufficient robustness against specific stresses, for example inappropriate use. What is essential here is that as a result of the high-strength design of the raw yarn and the steel filament, and the shrinkage behavior of the raw yarn made from PA6.6 cord that meets the requirements of the bandage ply, and the shrinkage behavior of the raw yarn made from PET cord that meets the requirements of the carcass ply, the strength members of at least one bandage ply and at least one carcass ply and at least one belt ply make it possible to maintain sufficient robustness of the tire against specific stresses, for example inappropriate use, even if the linear density of the individual strength members is relatively low. This applies in particular to the particularly stressed crown area where the above-mentioned components are arranged so as to overlap each other radially. In particular, the above-mentioned reinforcing ply can be arranged so as to overlap each other radially.

[0027] The high-strength design of the strength members of the bandage ply, carcass ply, and belt ply simultaneously enables a relatively thin combination with improved rolling resistance of the reinforcing ply having sufficient robustness.

[0028] Therefore, the reinforcing plies of the components can be implemented in a relatively thin manner, resulting in a further reduction in the rolling resistance of pneumatic vehicle tires. At the same time, the reinforcing plies still meet the specific requirements of each component, which are the carcass, belt, and belt bandage of the pneumatic vehicle tire, and in their combination, enable a tire that is sufficiently robust against specific stresses, such as improper use of the pneumatic vehicle tire.

[0029] The pneumatic vehicle tire according to the present invention has been found to exhibit further improved rolling resistance while maintaining sufficient robustness against certain stresses, such as improper use.

[0030] In an advantageous embodiment, the raw yarn made of PA6.6 has a yarn strength in the range of 13.5 cN / tex to 16.0 cN / tex with a 4% elongation.

[0031] Therefore, the woven strength member of the bandage ply has a relatively high modulus of elasticity for PA6.6 at a 4% elongation, and at the same time, it has favorable fatigue resistance with respect to compressive and bending fatigue stress. Thus, while the maximum elongation of approximately 3% required for tire manufacturing is maintained, greater elongation requires greater force to be applied, which is advantageous for high-speed tire operation.

[0032] In an advantageous embodiment, the fabric strength member of the bandage ply is in the form of a first bandage strength member, each first bandage strength member being formed from exactly one multifilament yarn made of PA6.6. The first bandage strength member has a yarn strength in the range of 20.5 cN / tex to 28.0 cN / tex at 4% elongation, and a twist coefficient α' of the multifilament yarn made of PA6.6 with a twist of 30 to 40.

[0033] As a result, the durability and robustness of the tire are fully guaranteed, even with the bandage ply which can be implemented in a particularly thin manner. The pneumatic vehicle tire implemented in this way is lightweight and has advantageous rolling resistance.

[0034] The twist coefficient α' of a multifilament yarn is calculated as (twist of multifilament yarn [t / m]) * (linear density of multifilament yarn [tex] / 1000). 1 / 2 It is defined as follows: The twist coefficient α' is a measure of the twist per meter of a multifilament yarn relative to the overall linear density of the multifilament yarn.

[0035] It is advantageous for the twist coefficient α' of the multifilament yarn made of PA6.6 for the first bandage strength member to be in the range of 25 to 40. This twist coefficient α' represents a favorable compromise between fatigue resistance and strength. A lower twist coefficient α' is detrimental to fatigue resistance, while a higher twist coefficient means lower strength for the fabric strength member.

[0036] The first bandage strength member is formed from exactly one multifilament yarn made of PA6.6, and thus has a PA6.6x1 structure. It is advantageous if the multifilament yarn made of PA6.6 has a linear density of 700 dtex.

[0037] In an advantageous embodiment, the fabric strength member of the bandage ply is in the form of a second bandage strength member, and each second bandage strength member is in the form of a cord having a PA6.6x2 structure. The second bandage strength member has an ultimate tensile strength based on a linear density greater than 74 cN / tex, a yarn strength in the range of 12 cN / tex to 20 cN / tex with 4% elongation, a thermal shrinkage of 4.0% to 7.0% measured with an exposure time of 2 minutes under a preload of 0.05 cN / dtex at 180°C, and a twist coefficient α of 100 to 250 end twists of the cord.

[0038] The use of such high-strength materials allows for relatively thin reinforcing plies. Such tires are lightweight and therefore feature advantageous rolling resistance, while simultaneously possessing sufficient durability and robustness.

[0039] The twist coefficient α of the cord end twist is (twist of end twist [t / m]) * (linear density of cord [tex] / 1000) 1 / 2 It is defined as follows: The twist coefficient α is a measure of the twist per meter of the cord relative to the overall linear density of the cord.

[0040] For the PA6.6×2 structure of the second bandage strength member, it is advantageous if the twist coefficient α of the end twist of this cord is in the range of 100 to 250. This twist coefficient represents a favorable compromise between fatigue resistance and strength. A lower twist coefficient should be detrimental with respect to fatigue resistance, while a higher twist coefficient should mean lower strength of the cord.

[0041] The second bandage strength member is in the form of a PA6.6x2 structure cord, and is therefore formed from just two PA6.6 multifilament yarns, which are twisted at the ends to form the cord. It is advantageous if the two multifilament yarns made from PA6.6 each have a linear density of 470 dtex or 700 dtex.

[0042] In an advantageous embodiment, the PET yarn has a yarn strength in the range of 25 cN / tex to 37 cN / tex with a 4% elongation.

[0043] As a result of using such high-strength materials for the carcass's structural components, it becomes possible to have tires that have favorable rolling resistance while also possessing sufficient robustness.

[0044] In an advantageous embodiment, the woven strength member of the carcass ply is in the form of a first carcass strength member, and the first carcass strength member is in the form of a cord having a PETx2 structure. The first carcass strength member has an ultimate tensile strength based on a linear density greater than 68 cN / tex, a yarn strength in the range of 15 cN / tex to 25 cN / tex according to ASTM D885 with an elongation of 4%, a thermal shrinkage coefficient of less than 2.8%, preferably less than 2.5%, measured at an exposure time of 2 minutes under a preload of 0.01 cN / dtex at 180°C, and a twist coefficient α of cord end twist of 150 to 250.

[0045] The first carcass strength member is characterized by high strength properties accompanied by favorable contraction behavior. Such a tire is lightweight and therefore features favorable rolling resistance, as well as sufficient durability and robustness.

[0046] The first carcass strength member is in the form of a PET x 2 structure cord, and is therefore formed from exactly two PET multifilament yarns, which are twisted at the ends to form the cord. It is advantageous if the two PET multifilament yarns each have a linear density of 1100 dtex.

[0047] For this PET×2 cord, a twist coefficient α at the end twist is favorable if it is in the range of 150 to 250. This twist coefficient represents a favorable compromise between fatigue resistance and strength. A lower twist coefficient should be detrimental in terms of fatigue resistance, while a higher twist coefficient should mean lower strength for the cord.

[0048] It is advantageous when the woven strength member of the bandage ply is in the form of a first bandage strength member with a PA6.6×1 structure, and the woven strength member of the carcass ply is in the form of a first carcass strength member with a PET×2 structure.

[0049] However, it is also advantageous when the woven strength member of the bandage ply is in the form of a second bandage strength member with a PA6.6×2 structure, and the woven strength member of the carcass ply is in the form of a first carcass strength member with a PET×2 structure.

[0050] In advantageous embodiments, the multifilament yarn fabricated with PA6.6 has a linear density of 450 dtex to 750 dtex, preferably 470 dtex to 700 dtex. Such a linear density of multifilament yarn fabricated with PA6.6 has proven particularly effective for use in tires according to the present invention.

[0051] In an advantageous embodiment, the PET multifilament yarn has a linear density of 1000 dtex to 1200 dtex, preferably 1100 dtex. Such a linear density of PET multifilament yarn has proven particularly effective for use in tires according to the present invention.

[0052] In an advantageous embodiment, the steel filaments of the belt ply strength member have a diameter of 0.20 mm to 0.42 mm, preferably 0.20 mm to 0.32 mm, or 0.33 mm to 0.40 mm. A diameter of 0.20 mm to 0.42 mm has proven particularly effective for use in tires according to the present invention.

[0053] For the strength members of a belt ply formed from a single steel filament, a diameter of 0.33 mm to 0.42 mm, preferably 0.35 mm to 0.40 mm, has been found to be particularly suitable.

[0054] For the strength members of the belt ply formed from two or more steel filaments, it was found that a diameter of 0.20 mm to 0.35 mm, preferably 0.20 mm to 0.32 mm, and particularly preferably 0.20 mm to 0.30 mm is especially suitable.

[0055] In an advantageous embodiment, the belt ply strength members are in the form of first belt strength members, each formed from exactly one steel filament. Each steel filament has a tensile strength of 3400 N / mm² to 4100 N / mm², and the belt ply has a linear density of 30 kN / dm to 50 kN / dm.

[0056] Such tires are lightweight and therefore feature advantageous rolling resistance, while simultaneously possessing sufficient durability and robustness.

[0057] Preferably, the steel filament has a diameter of 0.33 mm to 0.42 mm, and particularly preferably 0.33 mm, 0.35 mm, or 0.40 mm.

[0058] In another advantageous embodiment, the belt ply strength member is in the form of a second belt strength member. The second belt strength member is formed from two or more steel filaments. The second belt strength member preferably has an x2, 1+2, or 1+3 structure, and particularly preferably an x2 or 1+2 structure. Each steel filament has a tensile strength of 3000 N / mm² to 4000 N / mm². Preferably, the belt ply has a strength of 30 kN / dm to 75 kN / dm.

[0059] Such tires are lightweight and therefore feature advantageous rolling resistance, while simultaneously possessing sufficient durability and robustness.

[0060] Preferably, the diameter of the steel filament of the second belt strength member is 0.20 mm to 0.35 mm, particularly preferably 0.20 mm to 0.32 mm, and most preferably 0.20 mm to 0.30 mm. This is advantageous when the strength member of the 1+2 structure has a steel filament with a diameter of 0.29 mm.

[0061] In advantageous embodiments, PET and / or PA6.6 are formed whole or partially from their respective bio-based polymers.

[0062] It is advantageous if the PET is formed entirely or partially from bio-based PET.

[0063] It is advantageous if PA6.6 is formed entirely or partially from bio-based PA6.6.

[0064] In relation to the present invention, the term "bio-based polymer" in physical terms means a polymer whose starting monomers are entirely or at least partially formed from monomers obtained directly from biomass in physical form.

[0065] The polymer can be entirely produced from biomass-derived monomers; that is, in relation to the present invention, 100% by weight of the starting monomers was obtained directly from biomass in physical form. As a result, the pneumatic vehicle tire according to the present invention is optimized, in particular with respect to sustainability, and at the same time has very good properties.

[0066] Alternatively, polymers may be produced only partially from biomass-derived monomers, particularly if some of the parent monomers of the polymer are not obtained via biomass. In relation to the present invention, the expression "produced at least partially from biomass" means that more than 0% by weight of the starting monomers are directly obtained from biomass in physical form. As a result, the pneumatic vehicle tire according to the present invention is optimized with respect to the flexibility and sustainability required depending on the availability of the starting materials, while simultaneously possessing very good properties.

[0067] As is known to those skilled in the art, the proportion of bio-derived materials, i.e., the proportion of renewable raw materials in the polymer, can be determined according to ASTM D 6866 (C-14 method).

[0068] However, PA6.6 and / or PET can also be formed from non-biobased PA6.6 and / or non-biobased PET, that is, in relation to the present invention, none of the starting monomers of each polymer are directly obtained from biomass in physical form. PA6.6 and / or PET may be conventional, particularly mineral oil-based PA6.6 and / or conventional, particularly mineral oil-based PET.

[0069] In advantageous embodiments, PET and / or PA6.6 are formed whole or partially from their respective recycled polymers.

[0070] It is advantageous if PET is formed entirely or partially from recycled PET.

[0071] It is advantageous if PA6.6 is formed entirely or partially from recycled PA6.6.

[0072] In relation to the present invention, the expression "recycled polymer" means a polymer obtained by at least one recycling method. The recycling method may be any recycling method known to those skilled in the art, such as chemical and / or mechanical recycling.

[0073] The starting materials used for recycling are, in particular, bottles, clothing, and lint.

[0074] In relation to the present invention, the mechanical recycling method also includes heat treatment such as remelting.

[0075] In relation to the present invention, chemical recycling is the chemical treatment of any type of waste and the subsequent recovery of the product or precursor material. This may also mean the complete chemical modification of the physical source, i.e., the chemical properties of the waste, to molecules that are not immediately apparent, and the subsequent synthesis from these molecules to the extent of a polymer that will then be used as the recycled polymer in each multifilament yarn.

[0076] Furthermore, industrial yarn waste can be recycled and used as material for fabric strength components, particularly in the case of PET and PA6.6. In this regard, chemical and / or mechanical recycling may be feasible depending on the properties of the yarn waste and its similarity to the required material.

[0077] Recycled PET, especially that produced by mechanical recycling from bottles, differs from unused PET due to additives such as isophthalic acid (IPA) content. These impurities, particularly IPA, are present in PET bottles, for example. Recycled PET obtained by mechanical recycling from yarn waste also has a higher polydispersity index compared to unrecycled standard yarn.

[0078] PA6.6 and / or PET can be formed whole or in part from unused PA6.6 and / or unused PET.

[0079] To ensure reliable adhesion of the woven strength member to the rubber, it is advantageous to provide an adhesive impregnation system for the woven strength member by using immersion in, for example, a one-bath or two-bath process. The immersion solution may be an RFL (resorcinol-formaldehyde) immersion solution known from the prior art, or an environmentally friendly and health-safe RFL-free alternative, as described in, for example, German Patent Application Publication No. 102014211362A1, International Publication No. 2019015792A1, European Patent Application Publication No. 3702521A1, European Patent Application Publication No. 3702522A1, or European Patent Application Publication No. 3702523A1.

[0080] The carcass of a pneumatic vehicle tire has one or more carcass plies according to the present invention. A particularly simple carcass exists when all the reinforcing plies of the carcass are embodied as carcass plies according to the present invention. Preferably, the carcass is a single ply and is formed by strictly one carcass ply according to the present invention.

[0081] A belt bandage for a pneumatic vehicle tire has one or more bandage plies according to the present invention. A particularly simple belt bandage exists when all reinforcing plies of the belt bandage are embodied as bandage plies according to the present invention. Preferably, the belt bandage is a single ply and is formed by strictly one bandage ply according to the present invention.

[0082] The belt of a pneumatic vehicle tire has one, two or more belt plies according to the present invention. Preferably, the belt has two belt plies embodied according to the present invention, and its reinforcing members are arranged to intersect at a certain angle and to have an inclination opposite to the circumferential direction. A particularly simple belt exists in which all of the reinforcing plies of the belt are embodied as belt plies according to the present invention.

[0083] Pneumatic vehicle tires are manufactured, in particular, using apparatus and methods known to those skilled in the art.

[0084] In this regard, in particular, an unvulcanized blank of an unvulcanized vehicle tire having reinforcing plies according to the present invention, including all embodiments described, is first provided by laying a corresponding component comprising an unvulcanized rubber mixture in layers. The blank is then vulcanized.

[0085] The pneumatic vehicle tire according to the present invention is preferably a tire for a passenger car, van, or light truck. It is preferably a radially designed tire.

[0086] The present invention includes, in particular, all of the advantageous configurations reflected in the patent claims. The present invention also includes configurations obtained from combinations of different features, each with a different level of preference, and therefore the present invention also includes combinations of a first feature described as "preferred" with further features described, for example, "particularly preferred".

[0087] The present invention will be described in more detail below by two exemplary embodiments of the present invention, but will not be limited thereto.

[0088] The two pneumatic vehicle tires, particularly radial in design, embodied by the present invention, each comprises a carcass formed from carcass plies, a belt positioned radially outward from the carcass and formed from two belt plies, and a belt bandage formed from at least one bandage ply and covering at least the belt edge, extending radially outward from the belt. The carcass plies, belt plies, and bandage plies each have reinforcing members embedded in the rubber material in such a manner that they are arranged parallel and spaced apart from each other within each ply. The reinforcing members of the bandage plies are woven reinforcing members, each formed from at least one multifilament yarn made of polyamide 6.6 (PA6.6), the reinforcing members of the carcass plies are woven reinforcing members, each formed from at least one multifilament yarn made of polyethylene terephthalate (PET), and the reinforcing members of the belt plies each formed from at least one steel filament. The reinforcing members of the two belt plies are positioned to intersect at a certain angle and to have an inclination opposite to the circumferential direction.

[0089] The two pneumatic vehicle tires according to the present invention have the following strength members in their reinforcing plies (bandage ply, carcass ply, belt ply, in that order): First pneumatic vehicle tire: PA6.6 700x1, PET 1100x2, steel 1x0.35 Second pneumatic vehicle tires: PA6.6 470x2, PET 1100x2, Steel 1+2x0.29

[0090] The woven strength member of the bandage ply for two pneumatic vehicle tires is characterized in that the multifilament yarn made of PA6.6 has a linear density of 100 dtex to 1500 dtex, and the raw yarn made of PA6.6 of the multifilament yarn made of PA6.6 has an ultimate tensile strength based on a linear density of more than 87 cN / tex as measured according to ASTM D885, and a thermal shrinkage of more than 6% as measured with an exposure time of 2 minutes under a preload of 0.05 cN / dtex at 180°C.

[0091] Furthermore, the yarn made from PA6.6 has a yarn strength in the range of 13.5 cN / tex to 16.0 cN / tex with a 4% elongation.

[0092] The woven strength member of the carcass ply for two pneumatic vehicle tires is characterized by a PET multifilament yarn having a linear density of 1100 dtex, the PET filament yarn of the PET multifilament yarn having an ultimate tensile strength based on a linear density of 83.5 cN / tex as measured according to ASTM D885, and a thermal shrinkage coefficient of 7.2% as measured with an exposure time of 2 minutes under a preload of 0.01 cN / dtex at 180°C.

[0093] Furthermore, the PET yarn has a yarn strength of 32.1 cN / tex with a 4% elongation. Furthermore, the woven strength members of the carcass plies of two pneumatic vehicle tires embodied according to the present invention are each in the form of a first carcass strength member, the first carcass strength member being in the form of a cord having a PET×2 structure, the PET multifilament yarn having a linear density of 1100 dtex. The first carcass strength member has an ultimate tensile strength based on a linear density of 70.9 cN / tex, a yarn strength of 20.1 cN / tex according to ASTM D885 with 4% elongation, a thermal shrinkage of 2.2% measured with an exposure time of 2 minutes under a preload of 0.01 cN / dtex at 180°C, and a twist coefficient α of 195 cord end twists.

[0094] The strength members of the belt plies of two pneumatic vehicle tires are characterized in that the steel filaments have a tensile strength of 3000 N / mm² to 4100 N / mm² and a carbon content of 0.79% to 1.10% by weight, as measured according to ASTM D2969.

[0095] With respect to bandage plies, the present invention provides a first pneumatic vehicle tire, particularly a radial design, characterized in that the fabric strength member of the bandage ply according to the present invention is in the form of a first bandage strength member, and each first bandage strength member is formed from exactly one multifilament yarn made from PA6.6. The multifilament yarn made from PA6.6 has a linear density of 700 dtex. Furthermore, the first bandage strength member has a yarn strength in the range of 20.5 cN / tex to 28.0 cN / tex with an elongation of 4%, and a twist coefficient α' of the multifilament yarn made from PA6.6 with a twist of 25 to 70.

[0096] With respect to the belt ply, the first pneumatic vehicle tire according to the present invention is characterized in that each strength member of the belt ply is formed from exactly one steel filament, the steel filament has a diameter of 0.35 mm and a tensile strength of 3742 N / mm², and the belt ply has a strength of 34 kN / dm.

[0097] With respect to the bandage ply, the second pneumatic vehicle tire according to the present invention is characterized in that the strength member of the bandage ply according to the present invention is in the form of the second bandage strength member. They have a PA6.6x2 structure, and the multifilament yarn made from PA6.6 has a linear density of 470 dtex. The second bandage strength member has an ultimate tensile strength based on a linear density of over 74 cN / tex, a yarn strength of 12 cN / tex to 20 cN / tex with 4% elongation, a thermal shrinkage coefficient of 4.0% to 7.0% measured with an exposure time of 2 minutes under a preload of 0.05 cN / dtex at 180°C, and a twist coefficient α of cord end twist of 100 to 250.

[0098] With respect to the belt ply, the second pneumatic vehicle tire according to the present invention is characterized in that the strength members of the belt ply are each formed from three steel filaments, and have a 1+2 structure. The steel filaments have a diameter of 0.29 mm and a tensile strength of 3593 N / mm². The strength of the belt ply is 64 kN / dm.

[0099] As a result of the combination of high-strength materials in the carcass, belt bandage, and belt reinforcing plies, the two pneumatic vehicle tires embodied in this invention were found to maintain sufficient robustness against specific stresses despite relatively low material usage. At the same time, rolling resistance is further improved as a result of the relatively low material usage.

Claims

1. A pneumatic vehicle tire comprising a carcass having carcass plies, a belt having belt plies positioned radially outward of the carcass, and a belt bandage having bandage plies positioned radially outward on the belt, The carcass ply, the belt ply, and the bandage ply each have a strength member embedded in the rubber material in such a manner that they are arranged parallel to and spaced apart from each other within each ply. The strength members of the bandage ply are each woven strength members formed from at least one multifilament yarn made of polyamide 6.6 (PA6.6), The strength members of the carcass ply are each woven strength members formed from at least one multifilament yarn made of polyethylene terephthalate (PET), Each of the strength members of the belt ply is formed from at least one steel filament. The multifilament yarn made of PA6.6 has a linear density of 100 dtex to 1500 dtex, The multifilament yarn made from PA6.6, the original yarn made from PA6.6, - Ultimate tensile strength based on linear density exceeding 87 cN / tex, as measured according to ASTM D885, - It has a thermal shrinkage of more than 6% as measured by an exposure time of 2 minutes under a preload of 0.05 cN / dtex at 180°C, The PET multifilament yarn has a linear density of 50 dtex to 2500 dtex, The PET yarn of the PET multifilament yarn is - Ultimate tensile strength based on linear density of ≥70 cN / tex, as measured according to ASTM D885, - It has a thermal shrinkage of less than 8% as measured under a preload of 0.01 cN / dtex at 180°C with an exposure time of 2 minutes, The aforementioned steel filament is - Tensile strength of 3000 N / mm² to 4100 N / mm² as measured according to ASTM D2969, A pneumatic vehicle tire characterized by having a carbon content of 0.79% to 1.10% by weight.

2. The pneumatic vehicle tire according to claim 1, wherein the yarn made from PA6.6 has a yarn strength in the range of 13.5 cN / tex to 16.0 cN / tex with a 4% elongation.

3. The fabric strength member of the bandage ply is in the form of a first bandage strength member, and the first bandage strength member is formed from at least one multifilament yarn made of PA6.6, and the first bandage strength member is - Yarn strength in the range of 20.5 cN / tex to 28.0 cN / tex with a 4% elongation, A pneumatic vehicle tire according to at least one of claim 1 or 2, characterized in that the multifilament yarn made of PA6.6 with a twist coefficient α' of the twist.

4. The fabric strength member of the bandage ply is in the form of a second bandage strength member, and the second bandage strength member is in the form of a cord having the PA6.6x2 structure. - Ultimate tensile strength based on linear density exceeding 74 cN / tex, - Yarn strength in the range of 12 cN / tex to 20 cN / tex with a 4% elongation. - A thermal shrinkage rate of 4.0% to 7.0% measured at 180°C under a preload of 0.05 cN / dtex with an exposure time of 2 minutes, and A pneumatic vehicle tire according to at least one of claim 1 or 2, characterized in that the end twist of the cord has a twist coefficient α of 100 to 250.

5. A pneumatic vehicle tire according to at least one of claims 1 to 4, characterized in that the PET yarn has a yarn strength in the range of 25 cN / tex to 37 cN / tex at a 4% elongation.

6. The woven strength member of the carcass ply is in the form of a first carcass strength member, and each of the first carcass strength members is in the form of a cord having the PETx2 structure. - Ultimate tensile strength based on linear density exceeding 68 cN / tex, - With a 4% elongation, the yarn strength is in the range of 15 cN / tex to 25 cN / tex according to 25 ASTM D885. - Thermal shrinkage of less than 2.8%, preferably less than 2.5%, measured at 180°C under a preload of 0.01 cN / dtex for an exposure time of 2 minutes, and A pneumatic vehicle tire according to at least one of claims 1 to 5, characterized in that the end twist coefficient α of the 150 to 250 cords.

7. - The multifilament yarn produced in PA6.6 has a linear density of 450 dtex to 750 dtex, preferably 470 dtex to 700 dtex, and / or A pneumatic vehicle tire according to at least one of claims 1 to 6, characterized in that the PET multifilament yarn has a linear density of 1000 dtex to 1200 dtex, preferably 1100 dtex.

8. The pneumatic vehicle tire according to at least one of claims 1 to 7, characterized in that the steel filament has a diameter of 0.20 mm to 0.42 mm, preferably 0.20 mm to 0.32 mm, or 0.33 mm to 0.42 mm.

9. A pneumatic vehicle tire according to at least one of claims 1 to 8, characterized in that the strength member of the belt ply is in the form of a first belt strength member, each of the first belt strength members is formed from a precise one of the steel filaments, each of the steel filaments has a tensile strength of 3400 N / mm² to 4100 N / mm², and the belt ply has a strength of particularly 30 kN / dm to 50 kN / dm.

10. A pneumatic vehicle tire according to at least one of claims 1 to 8, characterized in that the strength member of the belt ply is in the form of a second belt strength member, the second belt strength member is preferably formed from two or more steel filaments of the steel filament forming the x2 or 1+2 or 1+3 structure, particularly preferably the x2 or 1+2 structure, the steel filament has a tensile strength of 3000 N / mm² to 4000 N / mm², and the belt ply has a strength of particularly 30 kN / dm to 75 kN / dm.

11. The pneumatic vehicle tire according to at least one of claims 1 to 10, characterized in that the PET and / or PA6.6 are formed entirely or partially from the respective bio-based polymers.

12. The pneumatic vehicle tire according to at least one of claims 1 to 11, characterized in that the PET and / or PA6.6 are formed entirely or partially from the respective recycled polymers.

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