• 专利附录
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    • 专利摘要:
    Textile cord (50) with at least triple twist (T1, T2, T3), having at least N strands (20a, 20b, 20c, 20d), N being greater than 1, twisted together in a final twist T3 and a final direction D2, each strand consisting of M pre-strands (10a, 10b, 10c), M being greater than 1, themselves twisted together according to an intermediate torsion T2 (T2a, T2b, T2c, T2d) and an intermediate direction D1 opposite at D2, each pre-strand itself consisting of a yarn (5) which has been previously twisted on itself by an initial twist T1 (T1a, T1b, Tic) and the direction D1, in which at least half of the N times M yarn has an initial module in extension noted Mi which is greater than 800 cN / tex. This textile cord is advantageously usable as a reinforcement in vehicle tires, in particular in the belt or in the carcass reinforcement of these tires.
    公开号:FR3029539A1
    申请号:FR1462101
    申请日:2014-12-09
    公开日:2016-06-10
    发明作者:Richard Cornille；Jeremy Guillaumain；Clerc Christophe Le；Augustin Bosquet
    申请人:Michelin Recherche et Technique SA Switzerland ；Compagnie Generale des Etablissements Michelin SCA；Michelin Recherche et Technique SA France；
    IPC主号:
    专利说明:

    [0001] FIELD OF THE INVENTION The present invention relates to textile reinforcing elements or "reinforcements" that can be used for reinforcing plastic articles or rubber articles such as tires for vehicles. It relates more particularly to cords or twists textile used in particular for the reinforcement of such tires. 2. STATE OF THE ART The textile is used as reinforcement since the origins of the tire.
    [0002] Textile cords, made from continuous textile fibers such as polyester, nylon, cellulose or aramid fibers, play an important role in tires, including high-performance tires approved for use at very high speeds. In order to meet the requirements of the tires, they must have a high tensile strength, a high extension modulus, good fatigue endurance and good adhesion to the rubber matrices or other polymers that they are likely to reinforce. . It will be recalled here simply that these twisted or cabled textiles, traditionally double twist (Ti, T2), are prepared by a twisting process in which: - during a first step, each yarn or fiber multifilamentary (in English "yarn") constitutive of the final cable is first individually twisted on itself (according to an initial twist Ti) in a given direction Dl (respectively S or Z direction), to form a strand (in English "Strand") in which the elementary filaments are imposed a helical deformation around the fiber axis (or axis of the strand); and then, during a second step, several strands, generally two, three or four in number, of identical or different natures in the case of so-called hybrid or composite cords, are then twisted together according to a final twist T2 (which may be be equal to or different from Ti) in the opposite direction D2 (respectively Z or S direction, according to a recognized nomenclature designating the orientation of the turns according to the transverse bar of an S or Z), to obtain the cable (English "card") or final assembly with several strands.
    [0003] P10-3471 3029539 - 2 - The role of the twisting is to adapt the properties of the material in order to create the transversal cohesion of the reinforcement, to increase its resistance in fatigue and also to improve the adhesion with the reinforced matrix.
    [0004] Such textile cords, their constructions and manufacturing processes are well known to those skilled in the art. They have been described in detail in a large number of documents, to mention only a few examples in the documents EP 021 485, EP 220 642, EP 225 391, EP 335 588, EP 467 585, US 3,419,060, US 3. 977,172, US 4,155,394, US 5,558,144, WO97 / 06294 or EP 848,767, or more recently WO2012 / 104279, WO2012 / 146612, WO2014 / 057082. To be able to reinforce rubber articles such as tires, the resistance to fatigue (endurance in extension, flexion, compression) of these textile cords is essential. It is known that, in general, for a given material, it is all the greater in that the twists used are important, but that in return, their tensile strength in extension (called toughness when it is reduced to weight unit) decreases inexorably when increases torsion, which of course is penalizing from the point of view of reinforcement.
    [0005] Also, designers of textile cords, such as tire manufacturers, are constantly looking for textile cords whose mechanical properties, particularly breaking strength and toughness, for a given material and twist, could be improved. BRIEF DESCRIPTION OF THE INVENTION In the course of their research, the Applicants have precisely found a new textile cord whose specific architecture and construction unexpectedly allow, for a given material and a final twist, to improve strength-breaking and toughness properties. Thus, according to a first object, the present invention relates to a textile cord with at least three twist (Ti, T2, T3), comprising at least N strands, N being greater than 1, twisted together in a twist T3 and a direction D2, each strand consisting of M pre-strands, M being greater than 1, themselves twisted together in a twisting T2 and a direction D1 opposite to D2, each pre-strand itself consisting of a yarn which has been previously twisted on itself according to a twist Ti and the direction Dl, wherein at least half of the N times M spun has an initial modulus in extension noted Mi which is greater than 800 cN / tex.
    [0006] The invention also relates to the use of such a textile cord as reinforcing element for articles or semi-finished products made of plastics or rubber such as pipes, belts, belts or belts. pneumatic vehicles, as well as these articles, semi-finished products of rubber and tires themselves, both in the green state (that is to say before cooking or vulcanization) and in the state cooked (after cooking). The tires of the invention, in particular, may be intended for motor vehicles of the tourism, 4x4, SUV (Sport Utility Vehicles) type, but also for two-wheeled vehicles such as motorcycles, or for industrial vehicles. selected from among 10 vans, "heavy goods vehicles" - ie, metro, buses, road transport vehicles (trucks, tractors, trailers), off-the-road vehicles -, agricultural or civil engineering machinery, other transport vehicles or handling. The textile cord of the invention is particularly intended for use in crown reinforcement (or belts) or in tire carcass reinforcement for vehicles described above. The invention as well as its advantages will be readily understood in the light of the detailed description and the following exemplary embodiments, as well as FIGS. 1 to 7 relating to these examples which are diagrammatic (unless otherwise indicated, without respect of a scale specific): - in cross section, a conventional multifilament textile fiber (or spun), first in the initial state (5) that is to say devoid of torsion, then after a first T1 twist operation in the direction D1, for forming a spun yarn on itself or "pre-strand" (10) (Fig. 1); - In cross section, the assembly of 3 yarns (10a, 10b, 10c) as above fulfilling the function of pre-strands (previously bent according to Tla, Tlb, Tlc in the same direction D1) which are assembled by a second torsion operation T2 always in the same direction D1, for forming a strand (20) for the cord 30 according to the invention (FIG 2); - In cross section, the assembly of 3 strands (20a, 20b, 20c) as above (previously twisted according to T2a, T2b, T2c in the same direction D1) which are assembled by a third T3 twist operation this time in the direction D2 opposite to the direction D1, for forming a final textile cord (30) with triple torsion (T1, T2, T3) according to the invention (FIG. - In cross section, the conventional assembly of 3 yarns (10a, 10b, 10c) as above filling this time directly the function of strands (all pre-twisted according to Tla, Tlb, Tlc in the direction D1) which are assembled by a second twisting operation T2 in the direction D2 opposite to the direction D1, for forming a textile cord according to the prior art (40) with double torsion (Ti, T2) (FIG. 4); in cross-section, the assembly of 4 strands (20a, 20b, 20c, 20d) (previously twisted according to T2a, T2b, T2c, T2d in the same direction D1) which are joined by a third T3 torsion operation in the direction D2 opposite the direction D1, for forming a final textile cord (50) with a triple twist (Ti, T2, T3) according to the invention (FIG. - In cross section, another representation of the cord (50) above, less schematic than the previous one, illustrating that the final section of a textile cord 10 (whether or not it complies with the invention), once formed and under minimal tension, is closer in fact to a circular contour section, due to the high lateral plasticity provided by the multifilament nature of the starting material (Fig. 6); finally, in radial section (that is to say in a plane containing the axis of rotation of the tire), an example of a tire according to the invention incorporating a textile cord according to the invention (FIG. ). 4. DETAILED DESCRIPTION OF THE INVENTION In the present application, unless expressly indicated otherwise, all the percentages (%) indicated are percentages by weight. Any range of values designated by the expression "between a and b" represents the range of values from more than a to less than b (i.e., terminals a and b excluded) while any range of values denoted by "from a to b" means the range of values from a to b (i.e., including the strict limits a and b). The cord or yarn of the invention is therefore (with reference to FIGS. 1 to 3, and 5 appended) a textile cord (30, 50) of very specific construction, whose essential characteristics include: at least one triple (that is, three or more than three) torsion (Ti, T2, T3); at least N strands (20, 20a, 20b, 20c, 20d), N being greater than 1, which are twisted together in a final twist T3 and in the same final direction D2; each strand consisting of M pre-strands (10, 10a, 10b, 10c), M being greater than 1, themselves twisted together according to an intermediate torsion T2 (T2a, T2b, T2c, T2d) and an intermediate direction Dl opposite to D2; each pre-strand consisting of a yarn (5) which has been previously twisted on itself according to an initial twist Ti (Tla, Tb 1, Tic) and the initial direction Dl. By cable having at least one triple twist (i.e., three or more twists), one skilled in the art will immediately recognize that at least three consecutive untwisting (or twisting in inverse) are therefore necessary to "deconstruct" the cabled of the invention and "back" to the initial yarns constituting it, that is to say to find the yarns (multifilamentary fibers) starting in their initial state that is that is to say devoid of torsion. In other words, there are at least three (three or more) successive twisting operations to constitute the cable of the invention, and not two as is usually the case.
    [0007] Another essential feature is that at least half of the yarns constituting the cord must have an initial modulus in extension Mi greater than 800 cN / tex (which excludes in particular nylon fibers), otherwise the gain in force-rupture and toughness is not observed. The structure of the textile cord of the invention as well as its manufacturing steps will now be described in detail. Firstly, FIG. 1 schematizes, in transverse section, a conventional multifilament textile fiber (5), also called "yarn" (in English "yarn"), in the initial state, that is to say devoid of twist; as is well known, such a yarn is formed of a plurality of elementary filaments (50), typically several tens to several hundred, of very fine diameter generally less than 25 μm. After a twisting operation Ti (first twist) in a direction D1 (S or Z), the initial yarn (5) is transformed into a twisted yarn on itself called "pre-strand" (10). In this pre-filament, the elementary filaments are thus imposed a helical deformation around the fiber axis (or axis of the pre-strand). Then, as illustrated by way of example in FIG. 2, M pre-strands (for example here three in number: 10a, 10b, 10c) are themselves twisted together, in the same direction D1 as before, according to an intermediate torsion T2 (second twist) for forming a "strand" (20). Each pre-strand is characterized by a first specific torsion Ti (for example here, T la, T lb, Tic) which may be equal (in the general case, that is to say that here we have for example Tla = Tlb = Tic) or different from one pre-strand to another.
    [0008] Finally, as shown diagrammatically in FIG. 3, N strands (for example here three in number: 20a, 20b, 20c) are themselves twisted together, in the direction D2 opposite to D1, according to a final twist T3 (third twist) for forming the final textile cord (30) according to the invention. Each strand is characterized by a second specific T2 twist (for example here, T2a, T2b, T2c) which may be equal (in the general case, that is to say that here is for example T2a = T2b = T2c) or different from one strand to another. P10-3471 3029539 - 6 - The final textile cord (30) thus obtained, comprising N times M (here, for example new) pre-strand, is therefore characterized by (at least) a triple twist (Ti, T2, T3) .
    [0009] The invention naturally applies to cases where more than three successive twists, for example four (T 1, T 2, T 3, T 4) or five (T 1, T 2, T 3, T 4, T 5), would be applied to spun yarns (5). However, the invention is preferably implemented with only three successive operations of torsion (Ti, T2, T3), especially for reasons of cost.
    [0010] FIG. 4, as compared with FIG. 3, illustrates a conventional method of preparing double twisted textile cords. M pre-strands (for example here three in number, 10a, 10b, 10c) - in fact directly filling the function of strands - are twisted together in a (second) direction D2 opposite the (first) direction of torsion D1 for direct forming of a double-twisted textile cord (40) (Ti, T2) according to the prior art. FIG. 5 schematizes, in cross section, the assembly of 4 strands (20a, 20b, 20c, 20d) (previously twisted according to T2a, T2b, T2c, T2d in the same direction D1) which are assembled by a third torsion operation T3 in the direction D2 opposite to the direction D1, for forming another example of a final cord (50) with a triple twist (Ti, T2, T3) according to the invention. Each strand is characterized by a second specific T2 twist (here, T2a, T2b, T2c, T2d) which may be equal to or different from one strand to another. As a reminder, FIG. 6 shows, again in cross-section, another representation of the preceding cord (50), less schematic than the previous one, recalling the well-known fact that the section of a textile cord, whether of Moreover, whether or not in accordance with the invention, once formed and under a minimum tension, it is closer in fact to a cylindrical structure with a substantially circular section, because of the high radial, lateral plasticity of the strands (20a). 20b, 20c, 20d) and pre-strands (10a, 10b, 10c) provided by the multifilament nature of the starting (spun) fibers. In the present application, the term "textile" or "textile material", in a very general manner, any material made of a material other than metal, whether natural or synthetic, capable of being transformed into yarn, fiber or film by any suitable method of transformation. For example, without the following examples being limiting, there may be mentioned a polymer spinning process such as, for example, melt spinning, solution spinning or gel spinning. Although materials of non-polymeric material (for example of mineral material such as glass or non-polymeric organic material such as carbon) are included in the definition of textile material, the invention is preferentially implemented with polymeric materials, both thermoplastic type and non-thermoplastic type.
    [0011] By way of examples of polymeric materials, of the thermoplastic or non-thermoplastic type, mention may be made, for example, of celluloses, in particular rayon, polyvinyl alcohols (abbreviated as "PVA"), polyketones, aramids (aromatic polyamides), polyesters aromatic compounds, polybenzazoles (abbreviated "PBO"), polyimides, polyesters, especially those chosen from PET (polyethylene terephthalate), PEN (polyethylene naphthalate), PBT (polybutylene terephthalate), PBN (polybutylene naphthalate), PPT (polypropylene terephthalate), PPN (polypropylene naphthalate). Of course, the invention applies to cases where the textile cord of the invention is formed of several yarns of different materials to constitute a hybrid or composite cord, for example based on yarns of at least polyester and nylon, or polyester and cellulose, or polyester and polyketone, or polyketone and nylon, or cellulose and nylon, or cellulose and polyketone, or cellulose and aramid, or aramid and polyketone, to name just a few examples, at least half of the N times M yarns of course with a Mi module greater than 800 cN / tex.
    [0012] In the cable of the invention, N preferably varies in a range from 2 to 6, more preferably from 2 to 4. According to another preferred embodiment, M varies in a range from 2 to 6, more preferably from 2 to 6. 4. According to another preferred embodiment, the total number of yarns (equal to N times M) is in a range from 4 to 25, more preferably from 4 to 16. In a manner well known to humans Twists can be measured and expressed in two different ways, either simply and in terms of the number of revolutions per meter (t / m), and which is more rigorous when it is desired to compare materials of different natures ( densities) and / or different titles, at helix angle of the filaments or equivalent in the form of a torsion factor K. The torsion factor K is related to the torsion T (here, for example, respectively Ti, T2 and T3) according to the following known relationship: K = (T orion T) x [(Title / (1000.p)] "2 in which the torsion T of the elementary filaments (constituting the pre-strand, strand or twisted) is expressed in revolutions per meter (t / m), the title is expressed in tex (weight in grams of 1000 40 meters pre-strand, strand or plied), and finally p is the density or density (in g / cm3) of the P10-3471 3029539 - 8 - constituent material of the pre-strand stranded or twisted (e.g., about 1.50 g / cm 3 for cellulose, 1.44 g / cm 3 for aramid, 1.38 g / cm 3 for a polyester such as PET, 1.14 g / cm 3 for nylon); in the case of a hybrid cable, it is of course an average of the densities weighted by the respective titles of the constituent materials of the pre-strands, strands or twists. In the cable of the invention, preferably, the twist Ti expressed in revolutions per meter (t / m) is between 10 and 350, more preferably between 20 and 200. According to another preferred embodiment, each pre-strand presents a torsion coefficient K1 which is between 2 and 80, more preferably between 6 and 70. According to another preferred embodiment, the torsion T2 expressed in revolutions per meter is preferably between 25 and 470, more preferably between 35 and 400. According to another preferred embodiment, each strand has a torsion coefficient K2 which is between 10 and 150, more preferably between 20 and 130. According to another preferred embodiment, the torsion T3 expressed in revolutions per meter is preferably between 30 and 600, more preferably between 80 and 500. According to another preferred embodiment, the cord of the invention has a coefficient K 3 twist factor which is between 50 and 500, more preferably between 80 and 230. Preferably, T2 is greater than T1 (Ti and T2 being in particular expressed in t / m). According to another preferred mode, combined or not with the preceding one, T2 is lower than T3 (T2 and T3 being in particular expressed in t / m), T2 being more preferably between 0.2 and 0.95 times T3, in particular between 0 , 4 and 0.8 times T3. According to another preferred embodiment, the sum T1 + T2 is between 0.8 and 1.2 times T3, more preferably between 0.9 and 1.1 times T3 (T1, T2 and T3 being in particular expressed in t / m), T1 + T2 being in particular equal to T3.
    [0013] In the cable of the invention, preferably the majority, more preferably all of the N times M spun (in the initial state, that is to say without the T1 twist) has a modulus Mi which is greater than 800 cN / tex, especially at 1000 cN / tex. The initial module in extension Mi, or Young's modulus, is of course the module in longitudinal extension-that is to say along the axis of the yarn.
    [0014] More preferably, at least half, in particular the majority, of the spun N times M has a modulus Mi greater than 1200 cN / tex, more particularly greater than 1400 cN / tex. Even more preferably, it is the totality of the N times spun which has a modulus Mi greater than 1000 cN / tex, especially greater than 1200 cN / tex, and more particularly greater than 1400 cN / tex.
    [0015] All the properties (title, initial modulus of the yarns, tensile strength and toughness) indicated above are determined at 20 ° C on unbleached cords (ie unsized) or glued (ie ready for use or extracts from the article they reinforce) which have been subjected to prior conditioning; by "prior conditioning" is meant the storage of the cords (after drying) for at least 24 hours, before measurement, in a standard atmosphere according to the European standard DIN EN 20139 (temperature of 20 ± 2 ° C., hygrometry of 65 ± 2%). The titre (or linear density) of the pre-strands, strands or cords is determined on at least three samples, each corresponding to a length of at least 5 m per weighing of this length; the title is given in tex (weight in grams of 1000 m of product - recall: 0, 111 tex equal to 1 denier). The mechanical properties in extension (toughness, initial modulus, elongation at break) are measured in known manner using an "INSTRON" traction machine equipped with "4D" type clamping tongs (for lower breaking force). at 100 daN) or "4E" (for breaking strength not less than 100 daN), unless otherwise specified in accordance with ISO 6892 of 1984. Tested samples are pulled to an initial length of 400 mm for 4D and 800 clamps mm for the 4E clamps, at a nominal speed of 200 mm / min, under a standard pretension of 0.5 cN / tex. All results given are an average of 10 measurements. When the properties are measured on yarns, the latter are well known in a known manner a very low preliminary torsion, called "protection twist", corresponding to a helix angle of about 6 degrees, before positioning and pulling in the clamps.
    [0016] The tenacity (breaking strength divided by the title) and the initial modulus in extension (or Young's modulus) are indicated in cN / tex or centinewton by tex (for recall, 1 cN / tex equal to 0.111 g / den ( gram per denier)). The initial modulus is represented by the tangent at the origin of the Force-Elongation curve, defined as the slope of the linear part of the Force-Elongation curve which occurs just after a standard pretension of 0.5 cN / tex. The elongation at break is indicated in percentage. 5. EXEMPLARY EMBODIMENTS OF THE INVENTION The textile cord of the invention is advantageously usable for reinforcing tires of all types of vehicles, in particular motorcycles, passenger vehicles or industrial vehicles such as heavy vehicles, civil engineering, other transport or handling vehicles. By way of example, FIG. 7 very schematically shows (without respecting a specific scale) a radial section of a tire according to the invention, for example for a vehicle of the tourism type. .
    [0017] This tire 100 comprises a crown 102 reinforced by a crown reinforcement 106, two sidewalls 103 and two beads 104, each of these beads being reinforced with a rod 105. The top 102 is surmounted by a tread, not shown. in this schematic figure. A carcass reinforcement 107 is wrapped around the two rods in each bead, the upturn 108 of this armature 107 being for example 10 disposed towards the outside of the tire 100 which is shown here mounted on its rim 109. The carcass reinforcement 107 is in a manner known per se consisting of at least one rubber ply reinforced by so-called "radial" textile cords, that is to say that these cords are arranged substantially parallel to one another and extend from one to the other. bead to the other so as to form an angle between 80 ° and 90 ° with the median circumferential plane (plane perpendicular to the axis of rotation of the tire which is located halfway between the two beads 104 and passes through the middle of the vertex frame 106). The belt 106 is for example constituted, in a manner known per se, by at least two so-called "working plies" or "triangulation plies", superimposed and crossed, reinforced with metal cables arranged substantially parallel to one another with respect to each other. the others and inclined relative to the median circumferential plane, these working plies may be associated or not with other plies and / or fabrics of rubber. These working plies have the primary function of giving the tire a high rigidity of drift. The belt 106 further comprises in this example a rubber sheet called "shrink web" reinforced by so-called "circumferential" reinforcing son, that is to say that these reinforcing son are arranged substantially parallel to each other and extend substantially circumferentially around the tire so as to form an angle preferably within a range of 0 to 10 ° with the medial circumferential plane. These circumferential reinforcing son have the primary function, it is recalled, to resist the centrifugation of the top at high speed. For example, this tire 100 of the invention has the essential feature that at least the belt of its belt (106) and / or its carcass reinforcement (107) comprises a textile cord according to the invention. According to another example of a possible embodiment of the invention, it is for example the rods (105) which could consist, in whole or in part, of a textile cord according to the invention. The rubber compositions used for these webs are conventional compositions for calendering textile reinforcements, typically based on natural rubber or other diene elastomer, a reinforcing filler such as carbon black, a system vulcanization and customary additives. The adhesion between the composite textile cord of the invention and the rubber layer which coats it is ensured for example by a usual adhesive composition, for example an adhesive of the RFL type or equivalent adhesive.
    [0018] Due to its specific construction, the textile cord of the invention has significantly improved tensile properties, as demonstrated by the following exemplary embodiments.
    [0019] In these exemplary embodiments, 6 different tensile tests were conducted with a total of 13 different textile cords made of nylon, rayon or aramid, whether or not in accordance with the invention. The nature of each exemplary cord ("T" for indicator, "C" for comparative and "I" for the invention), the material used ("N" for nylon, "R" for rayon, "A" For aramid), its construction and its final properties are summarized in the attached Table 1. The starting yarns are of course commercially available, for example for nylon sold by Kordsa under the name "T728", or by the company PHP 20 under the names "Enka 140HRT or" Enka 444HRST ", for the rayon by the Cordenka company under the name "C610-F Super2", for the aramid by the company Teijin under the name "Twaron 1000". As already mentioned, toughness is the breaking strength reported in the title, it is expressed in cN / tex. Also indicated is the apparent toughness (in daN / mm 2), in this case the breaking force is referred to the apparent diameter noted 0 which is measured according to the following method. An apparatus is used which, using a receiver composed of a collecting optical system, a photodiode and an amplifier, makes it possible to measure the shadow of a wire illuminated by a LASER beam of light. parallel with an accuracy of 0.1 micrometer. Such a device is marketed for example by the company Z-Mike, under the reference "1210". The method consists in fixing on a motorized moving table, under a standard pretension of 0.5 cN / tex, a sample of the wire to be measured, having been pre-conditioned. In solidarity with the moving table, the wire is moved perpendicular to the drop shadow measurement system at a speed of 25 mm / sec and orthogonally cuts the LASER beam. At least 200 measurements of shadows are made over a length of 420 mm of wire; the average of these drop shadow measurements represents the apparent diameter O. For each test, breaking strength, toughness and apparent toughness were also indicated in relative values, with the base 100 being used for the control cord of each test. The control cords (denoted "T" in Table 1) are all characterized by a conventional double-twist construction Ti, T2; the other cabled (comparative or in accordance with the invention) are all characterized by an unconventional construction with triple torsion Ti, T2, T3. However, only the cords according to the invention combine the triple twist characteristic and an initial yarn modulus greater than 800 cN / Tex. To help reading this table 1, it will be noted here that, for example, the construction denoted by "N47 / - / 3/4" of the control cable C 1 signifies that this cord is a double twist cable 10 (Ti, T2) which is simply the result of a twisting operation (T2, D2 or S) of 4 different strands which were each prepared beforehand by a reverse twist operation (Ti, Dl or Z) of 3 individual nylon (N) spun yarns of title 47 tex. Comparatively, for the construction denoted "N47 / 1/3/4" (wired C2), the textile cord 15 concerned is a triple-twisted cord (Ti, T2, T3) which is derived from a final twisting operation (T3 , D2 or S) of 4 different strands which have each been prepared beforehand by an intermediate twisting operation (T2) in the opposite direction (D1 or Z) of 3 pre-strands, each of the pre-strands consisting of 1 single nylon spun yarn (N) of title 47 tex which has been previously twisted on itself during a first torsion operation Ti in the same direction D1 (Z). The 6 examples of control cords (denoted "T") C1, C3, C5, C7, C9 and C12 are all characterized by a double twist construction; they were manufactured by assembling 2, 3 or 4 strands according to a (second) final twist (denoted T2) of 150 to 300 t / m, corresponding to a torsion coefficient K2 ranging from 175 to 215, and a direction D2 (S direction). Conventionally, each of these strands was previously manufactured by a (initial) initial twist (denoted Ti) of 150 to 300 t / m depending on the case of a yarn on itself in the opposite direction Dl (Z direction) .
    [0020] The 4 examples of cords according to the invention (denoted "I" and in bold in Table 1) C8, C10, C11 and C13 are all characterized by a triple torsion construction Ti, T2, T3 (in these examples, Z / Z / S); they were manufactured by assembling 3 or 4 strands in a final twist (denoted T3) of 150 to 300 t / m, corresponding to a torsion coefficient K3 ranging from 180 to 215, and a direction D2 (direction S). According to the invention, each of these strands was previously manufactured by assembling 3 pre-strands according to a T2 twist (110 to 240 rpm depending on the case) and an opposite direction D1 (Z direction), each of these pre-strand having itself been prepared beforehand by a twist Ti (40 to 120 t / m depending on the case) of a yarn on itself in the direction Dl (Z direction). As for the 3 comparative examples of cords not according to the invention (denoted "C") C2, C4 and C6, they are all characterized by a triple torsion construction T1, T2, T3. They were rigorously prepared like the cables according to the invention, the only difference being that the constituent yarns of these cords, all made of nylon, had an initial modulus Mi which is clearly less than 800 cN / tex. A detailed reading of this table 1, we note first, for tests 1 to 3, all conduits with nylon yarns (initial module 440 cN / tex approximately), that the passage of the double twist (Cl , C3 and C5) at triple torsion (C2, C4 and C6) is not accompanied by any noticeable change in breaking strength or other properties (0 and title). On the other hand, for tests 4 to 6, carried out with yarns whose initial modulus Mi is greater than 800 cN / tex, more precisely rayon yarns (M n of about 1000 cN / tex) or aramid (mw of 4000 cN / tex about), it can be seen that the passage of the double torsion construction (C7, C9 and C12) to the triple torsion construction (C8, C10, C11 and C13), all things being equal, is accompanied by unexpected: - an improvement of at least 5% of the force at break, which is quite significant for the skilled person; 20 - combined with a significant decrease in the apparent diameter 0 and the title, clear indicators of a better compactness of the cord according to the invention and ultimately the quality of the reinforcement, thanks to its very specific construction; - all resulting finally in an increase of more than 10% of the apparent tenacity; The gains in breaking strength and apparent toughness may even exceed 15% and 25%, respectively, in the case of the C13 cord according to the invention. In conclusion, thanks to the invention, it is now possible, for a given material and a final twist, to improve the properties of compactness, breaking strength and toughness of textile cords used for reinforcing tires, and thus to further optimize the architecture of these. P10-3471 3029539 -14- Table 1 No. Ref. Nature Wired Construction Module Twist t / m Tensile Coefficient Mechanical Properties Wired Initial Wired Wire Test Strength 0 Title Toughness Tenacity apparent apparent failure cN / tex - T1 T2 - K1 K2 daN mm tex cN / tex daN / mm2 T1 T2 T3 K1 K2 K3 1 Cl T N47 / - / 3/4 440 0 250Z 250S 0 88 176 35.3 100 1.05 638 55 100 41 100 C2 C N47 / 1/3/4 440 100Z 150Z 250S 20 53 176 34.1 97 1.02 642 53 96 42 102 2 C3 T N94 / - / 2/3 440 0 260Z 260S 0 106 183 41.2 100 1.03 636 65 100 50 100 C4 C N94 / 1/2/3 440 100Z 160Z 260S 29 65 183 42.3 103 1.04 640 66 102 50 100 3 C5 T N140 / - / 2/2 440 0 250Z 250S 0 124 175 44.5 100 1.02 613 73 100 54 100 C6 C N140 / 1 / 2/2 440 100Z 150Z 250S 35 74 175 43.5 98 1.03 608 72 99 52 96 4 C7 T R122 / - / 3/4 1000 0 180Z 180S 0 90 180 46.5 100 1.56 1730 27 100 24 100 C8 I R122 / 1/3/4 1000 40Z 140Z 180S 12 70 180 48.7 105 1.52 1719 28 105 27 113 5 C9 T A55 / - / 3/4 4000 0 300Z 300S 0 102 203 110.6 100 1.07 777 142 100 122 100 C10 I A55 / 1/3/4 4000 60Z 240Z 300S 12 81 203 119, 4 108 1,03 764 156 110 143 117 C11 I A55 / 1/3/4 4000 120Z 180Z 300S 23 61 203 116.9 106 1.04 765 153 108 137 112 6 C12 T A330 / - / 3/3 4000 0 150Z 150S 0 124 215 404.2 100 2.48 3482 116 100 84 100 C13 I A330 / 1/3/3 4000 40Z 110Z 150S 19 91 215 467.8 116 2.37 3428 136 117 106 126 P10-3471
    权利要求:
    Claims (22)
    [0001]
    REVENDICATIONS1. A textile cord (30, 50) of at least triple twist (Ti, T2, T3), having at least N strands (20, 20a, 20b, 20c, 20d), N being greater than 1, twisted together in a twist T3 and a direction D2, each strand consisting of M pre-strands (10, 10a, 10b, 10c), M being greater than 1, themselves twisted together according to a T2 twist (T2a, T2b, T2c, T2d) and a direction D1 opposite D2, each pre-strand itself consisting of a yarn (5) which has been previously twisted on itself in a twist Ti (Tla, T lb, T1c) and the direction Dl, in which at least half of the N times M spun has an initial modulus in extension noted Mi which is greater than 800 cN / tex.
    [0002]
    The cable of claim 1, wherein N varies in a range from 2 to 6, preferably from 2 to 4.
    [0003]
    The cable of any of claims 1 or 2, wherein M varies in a range from 2 to 6, preferably from 2 to 4.
    [0004]
    4. The cable of any one of claims 1 to 3, wherein the total number N times M of yarns is in a range from 4 to 25, preferably from 4 to 16.
    [0005]
    5. Wired according to any one of claims 1 to 4, wherein the twist Ti expressed in revolutions per meter is between 10 and 350, preferably between 20 and 200.
    [0006]
    The cable of any one of claims 1 to 5, wherein each pre-strand has a torsion coefficient K1 of between 2 and 80, preferably between 6 and 70.
    [0007]
    7. The cable of any one of claims 1 to 6, wherein the T2 twist expressed in revolutions per meter is between 25 and 470, preferably between 35 and 400.
    [0008]
    The cord according to any one of claims 1 to 7, wherein each strand has a torsion coefficient K2 which is between 10 and 150, preferably between 20 and 130.
    [0009]
    The cord according to any one of claims 1 to 8, wherein the twist T3 expressed in revolutions per meter is between 30 and 600, preferably between 80 and 500. P10-3471 3029539 -16-
    [0010]
    Wired according to any one of claims 1 to 9, having a torsion coefficient K3 which is between 50 and 500, preferably between 80 and 230.
    [0011]
    The cable of any one of claims 1 to 10, wherein T2 is greater than T1.
    [0012]
    The cable of any one of claims 1 to 11, wherein T3 is greater than T2. 10
    [0013]
    The cable of claim 12, wherein T2 is 0.2 to 0.95 times T3, preferably 0.4 to 0.8 times T3.
    [0014]
    14. A wired according to any one of claims 1 to 13, wherein the sum T1 + T2 is between 0.8 and 1.2 times T3, preferably between 0.9 and 1.1 times T3.
    [0015]
    The cable of claim 14, wherein the sum T1 + T2 is equal to T3.
    [0016]
    The cable of any one of claims 1 to 15, wherein the majority, preferably all, of the spun N times have a Mi modulus greater than 800 cN / tex.
    [0017]
    The cable of any of claims 1 to 16, wherein at least half, preferably most, of the spun N times have a Mi modulus greater than 1000 cN / tex. 25
    [0018]
    The cable of claim 17, wherein all of the N times spun have a Mi modulus greater than 1000 cN / tex, preferably greater than 1200 cN / tex.
    [0019]
    19. Use of a cord according to any of claims 1 to 18 for reinforcing an article or semi-finished product of plastics material or rubber.
    [0020]
    20. A semi-finished product or article of plastics material or cord-reinforced rubber according to any one of claims 1 to 18.
    [0021]
    21. Use of a cord according to any one of claims 1 to 18 for the reinforcement of a tire.
    [0022]
    22. A tire reinforced with a cord according to any one of claims 1 to 18. P10-3471
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    同族专利:
    公开号 | 公开日
    CN107002354B|2019-11-01|
    JP6778191B2|2020-10-28|
    EP3230505B1|2019-07-17|
    EP3230505A1|2017-10-18|
    US20170327976A1|2017-11-16|
    WO2016091809A1|2016-06-16|
    JP2017538049A|2017-12-21|
    FR3029539B1|2017-05-19|
    CN107002354A|2017-08-01|
    KR20170093824A|2017-08-16|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US1632201A|1925-10-15|1927-06-14|Goodyear Tire & Rubber|Pneumatic tire|
    US1708668A|1928-01-17|1929-04-09|Goodyear Tire & Rubber|Tire-fabric construction|
    US2116937A|1935-12-11|1938-05-10|Gen Tire & Rubber Co|Tire cord|
    US3607499A|1969-02-24|1971-09-21|Owens Corning Fiberglass Corp|Method of making power transmission belts|
    EP2186652A1|2007-09-05|2010-05-19|Sumitomo Rubber Industries, Ltd.|Tire for motor bicycle for uneven terrain travel|
    CN201132908Y|2007-11-27|2008-10-15|中国水产科学研究院东海水产研究所|Small dimension and high-strength three-ply polyethylene to-lay for deep sea cage|FR3029542B1|2014-12-09|2017-07-28|Michelin & Cie|TEXTILE CABLE HIGH MODULE AT AT LEAST TRIPLE TORSION|
    FR3034435B1|2015-03-31|2018-03-02|Compagnie Generale Des Etablissements Michelin|HYBRID REINFORCING ELEMENT WITH DIFFERENTIATED TORSIONS|
    WO2019180369A1|2018-03-20|2019-09-26|Compagnie Generale Des Etablissements Michelin|Improved aramid textile cord with an at least triple twist|
    EP3768883A1|2018-03-20|2021-01-27|Compagnie Générale des Etablissements Michelin|Pneumatic tyre comprising an improved aramid textile cord with an at least triple twist|
    FR3102097A1|2019-10-16|2021-04-23|Compagnie Generale Des Etablissements Michelin|PNEUMATIC WITH REDUCED NOISE EMISSION AND ITS MANUFACTURING PROCESS|
    FR3102089A1|2019-10-16|2021-04-23|Compagnie Generale Des Etablissements Michelin|PNEUMATICS PRESENTING AN IMPROVED UNIFORMITY AND ITS MANUFACTURING PROCESS|
    法律状态:
    2015-12-21| PLFP| Fee payment|Year of fee payment: 2 |
    2016-06-10| PLSC| Publication of the preliminary search report|Effective date: 20160610 |
    2016-12-22| PLFP| Fee payment|Year of fee payment: 3 |
    2017-12-21| PLFP| Fee payment|Year of fee payment: 4 |
    2019-09-27| ST| Notification of lapse|Effective date: 20190906 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1462101A|FR3029539B1|2014-12-09|2014-12-09|TEXTILE CABLE WITH AT LEAST TRIPLE TORSION|FR1462101A| FR3029539B1|2014-12-09|2014-12-09|TEXTILE CABLE WITH AT LEAST TRIPLE TORSION|
    KR1020177015330A| KR20170093824A|2014-12-09|2015-12-07|Textile cord having an at least triple twist|
    EP15807849.3A| EP3230505B1|2014-12-09|2015-12-07|Textile cord having an at least triple twist|
    JP2017530113A| JP6778191B2|2014-12-09|2015-12-07|Textile cord with at least triple twist|
    CN201580067302.3A| CN107002354B|2014-12-09|2015-12-07|Textile cord at least three kinds twists|
    PCT/EP2015/078833| WO2016091809A1|2014-12-09|2015-12-07|Textile cord having an at least triple twist|
    US15/532,757| US20170327976A1|2014-12-09|2015-12-07|Textile cord having an at least triple twist|
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