Classifications

• • D—TEXTILES; PAPER
  • D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
  • D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
  • D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
  • D02G3/44—Yarns or threads characterised by the purpose for which they are designed
  • D02G3/48—Tyre cords
• • D—TEXTILES; PAPER
  • D07—ROPES; CABLES OTHER THAN ELECTRIC
  • D07B—ROPES OR CABLES IN GENERAL
  • D07B1/00—Constructional features of ropes or cables
  • D07B1/02—Ropes built-up from fibrous or filamentary material, e.g. of vegetable origin, of animal origin, regenerated cellulose, plastics
• • D—TEXTILES; PAPER
  • D07—ROPES; CABLES OTHER THAN ELECTRIC
  • D07B—ROPES OR CABLES IN GENERAL
  • D07B1/00—Constructional features of ropes or cables
  • D07B1/02—Ropes built-up from fibrous or filamentary material, e.g. of vegetable origin, of animal origin, regenerated cellulose, plastics
  • D07B1/025—Ropes built-up from fibrous or filamentary material, e.g. of vegetable origin, of animal origin, regenerated cellulose, plastics comprising high modulus, or high tenacity, polymer filaments or fibres, e.g. liquid-crystal polymers
• • D—TEXTILES; PAPER
  • D07—ROPES; CABLES OTHER THAN ELECTRIC
  • D07B—ROPES OR CABLES IN GENERAL
  • D07B2201/00—Ropes or cables
  • D07B2201/10—Rope or cable structures
  • D07B2201/104—Rope or cable structures twisted
  • D07B2201/1044—Rope or cable structures twisted characterised by a value or range of the pitch parameter given
• • D—TEXTILES; PAPER
  • D07—ROPES; CABLES OTHER THAN ELECTRIC
  • D07B—ROPES OR CABLES IN GENERAL
  • D07B2201/00—Ropes or cables
  • D07B2201/10—Rope or cable structures
  • D07B2201/104—Rope or cable structures twisted
  • D07B2201/1064—Rope or cable structures twisted characterised by lay direction of the strand compared to the lay direction of the wires in the strand
• • D—TEXTILES; PAPER
  • D07—ROPES; CABLES OTHER THAN ELECTRIC
  • D07B—ROPES OR CABLES IN GENERAL
  • D07B2201/00—Ropes or cables
  • D07B2201/20—Rope or cable components
  • D07B2201/2001—Wires or filaments
  • D07B2201/2009—Wires or filaments characterised by the materials used
• • D—TEXTILES; PAPER
  • D07—ROPES; CABLES OTHER THAN ELECTRIC
  • D07B—ROPES OR CABLES IN GENERAL
  • D07B2201/00—Ropes or cables
  • D07B2201/20—Rope or cable components
  • D07B2201/2015—Strands
  • D07B2201/2024—Strands twisted
  • D07B2201/2025—Strands twisted characterised by a value or range of the pitch parameter given
• • D—TEXTILES; PAPER
  • D07—ROPES; CABLES OTHER THAN ELECTRIC
  • D07B—ROPES OR CABLES IN GENERAL
  • D07B2501/00—Application field
  • D07B2501/20—Application field related to ropes or cables
  • D07B2501/2046—Tire cords
• • D—TEXTILES; PAPER
  • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
  • D10B2201/00—Cellulose-based fibres, e.g. vegetable fibres

Definitions

• 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.
• 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. To meet the requirements of the tires, they must have a high tensile strength, a high extension modulus, good fatigue endurance and finally good adhesion to rubber matrices or other polymers they are likely to strengthen.
• twines or textile cords traditionally double twisted (T1, T2), are prepared by a twisting process in which: during a first step, each yarn or multifilament fiber (English “yarn”) constitutive of the final cable is first individually twisted on itself (according to an initial twist Tl) in a given direction Dl (respectively S or Z direction), to form a strand (in English " strand ”) in which the elementary filaments are imposed helical deformation around the fiber axis (or axis of the strand);
• 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 T1) 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 (in English "cord") or final assembly with several strands.
• the role of the twisting is to adapt the properties of the material in order to create the transverse cohesion of the reinforcement, to increase its resistance to fatigue and also to improve the adhesion with the reinforced matrix.
• the present invention relates to a cellulosic textile cord having at least three torsion (T1, T2, T3), comprising at least N strands, N being greater than 1, twisted together in a torsion T3 and a direction D2 each strand being constituted by 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 twisted beforehand on itself in a twist T1 and the direction D1, in which at least half of the N times M spun are cellulosic yarns.
• the invention also relates to the use of such a textile cord as a reinforcement element for articles or semi-finished products made of plastic or rubber such as pipes, belts, conveyor belts, tires for vehicles and that these articles, semi-finished rubber products and tires themselves, both in the raw state (that is to say before cooking or vulcanization) and in the cooked state (after cooking).
• a textile cord as a reinforcement element for articles or semi-finished products made of plastic or rubber such as pipes, belts, conveyor belts, tires for vehicles and that these articles, semi-finished rubber products and tires themselves, both in the raw state (that is to say before cooking or vulcanization) and in the cooked state (after cooking).
• the tires of the invention 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 vans, "heavy goods vehicles” - ie, metros, buses, road transport vehicles (trucks, tractors, trailers), off-the-road vehicles -, agricultural or civil engineering machinery, airplanes, other transport vehicles or Handling.
• SUV Sport Utility Vehicles
• the textile cord of the invention is particularly intended to be used in crown reinforcement (or belts) or in tire carcass reinforcement for the vehicles described above.
• FIGS. 1 to 7 relating to these examples which are diagrammatic (unless otherwise indicated, without respecting a specific scale. ): 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 Tl twist operation in the direction D1, for forming a twisted yarn on itself or "pre-stranded" (10) (Fig. 1);
• 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 designated by the expression “from a to b” means the range from a to b (i.e., including the strict limits a and b).
• the cord or cellulosic textile twister of the invention is therefore (with reference to FIGS. 1 to 3, and 5 appended) a textile cord (30, 50) of very specific construction, which has the essential characteristics of comprising: at least one triple (ie three or more than three) torsion (T1, T2, T3);
• N at least N strands (20, 20a, 20b, 20c, 20d), N being greater than 1, which are twisted together in a final twist T3 and 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 D1 opposite at D2;
• Tl initial twist
• Tlb initial twist
• Dl initial direction
• cord having at least one triple twist i.e. three or more twists
• at least three consecutive untwisting (or twisting) operations are therefore necessary for deconstruct the cable of the invention and "go back" to the initial yarns constituting it, that is to say, find the yarns (multifilamentary fibers) starting in their initial state that is to say devoid of torsion.
• Another essential feature is that at least half of the yarns constituting the cord are cellulosic yarns.
• 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; in a well known manner, 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 ⁇ .
• pre-strand 10
• the elementary filaments are thus imposed helically deformation around the fiber axis (or axis of the pre-strand).
• M pre-strands for example here three in number: 10a, 10b, 10c
• T2 second twist
• 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.
• the final textile cord (30) thus obtained, comprising N times M (here, for example new) pre-stranded, is therefore characterized by (at least) a triple twist (T1, T2, T3).
• the invention naturally applies to cases where more than three successive twists, for example four (Tl, T2, T3, T4) or five (Tl, T2, T3, T4, T5), would be applied to the yarns. (5) departure.
• the invention is preferably implemented with only three successive operations of torsion (T1, T2, T3), especially for reasons of cost.
• Figure 4, compared to Figure 3, illustrates a conventional method of preparing double twist textile cords.
• M pre-strands for example here three in number, 10a, 10b, 10c
• M pre-strands 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 formation of a double twist textile cord (40) (T1, 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 triple torsion (T1, 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.
• FIG. 6 represents, again in cross-section, another representation of the preceding cord (50), less schematic than the preceding one, recalling the well-known fact that the section of a textile cord, that it is moreover whether or not in accordance with the invention, once formed and under a minimum tension, 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 fibers (spun) starting.
• the term "textile” or “textile material” generally means 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 processing method.
• a polymer spinning process such as, for example, melt spinning, solution spinning or gel spinning.
• cellulosic yarn or cord is meant in a well-known manner any spun or cabled in a cellulosic material, that is to say based on cellulose, a cellulose derivative or cellulose regenerated from a derivative cellulosic, whatever the course of the spinning process.
• cellulose derivative is meant any compound formed, as a result of chemical reactions, by substitution of the hydroxyl groups of the cellulose, this derivative also being called a substitution derivative.
• regenerated cellulose means a cellulose obtained by a regeneration treatment carried out on a cellulose derivative.
• cellulosic fibers By way of examples of cellulosic fibers, mention may be made, for example, of the rayon or viscose fibers marketed by Cordenka or the "Lyocell” fibers marketed by Hyosung. Mention may also be made of high modulus fibers made of cellulose formate or regenerated cellulose as described in applications WO 85/05115 or WO 97/06294.
• the invention applies to cases where the cellulosic textile cord of the invention is formed of several yarns of which at least one (that is to say one or more) is of a different material of a cellulosic material to form a hybrid or composite cord, at least half of the N times spun y being cellulosic yarns.
• hybrid cellulosic cords include those based on yarns of at least cellulose and nylon, or cellulose and polyester, or cellulose and polyketone, or cellulose and aramid.
• N preferably varies in a range from 2 to 6, more preferably from 2 to 4.
• M varies in a range from 2 to 6, more preferably from 2 to 6. 4.
• the total number of yarns (equal to N times M) is in a range from 4 to 25, more preferably from 4 to 16.
• twists can be measured and expressed in two different ways, either simply and in a number of revolutions per meter (t / m), and this is more rigorous when would like to compare materials of different natures (densities) and / or titles, at helix angle of the filaments or what is equivalent in the form of a torsion factor K.
• the twist T1 expressed in revolutions per meter is between 10 and 350, more preferably between 20 and 200.
• each pre-strand presents a torsion coefficient K1 which is between 2 and 80, more preferably between 6 and 70.
• the torsion T2 expressed in revolutions per meter is preferably between 25 and 470, more preferably between 35 and 400.
• each strand has a torsion coefficient K2 which is between 10 and 150, more preferably between 20 and 130.
• the torsion T3 expressed in revolutions per meter is preferably between 30 and 600, more preferably between 80 and 500.
• the cord of the invention has a coefficient K3 torsion factor which is between 50 and 500, more preferably between 80 and 230.
• T2 is greater than T1 (T1 and T2 being in particular expressed in t / m).
• 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.
• 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.
• the majority (in number), more preferably all of the N times spun are cellulosic yarns; in the initial state, that is to say without the twist T1, these cellulosic yarns have a modulus Mi which is preferably greater than 800 cN / tex, more preferably greater than 900 cN / tex.
• the initial module in extension Mi, or Young's modulus is of course the modulus in longitudinal extension, that is to say along the axis of the yarn.
• these cellulosic yarns have a modulus Mi greater than 1000 cN / tex, especially greater than 1200 cN / tex, more particularly greater than 1400 cN / tex.
• All the properties (title, initial modulus of the yarns, breaking strength and toughness) given above are determined at 20 ° C on unbleached or glued cords (that is to say, unglued). say ready to use or extracts from the article they reinforce) that have been subjected to prior conditioning; "Prior conditioning” means the storage of 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, 1 1 1 tex equal to 1 denier).
• the mechanical properties in extension are measured in a known manner by means of an "INSTRON" traction machine equipped with "4D” type clamping tongs (for breaking strength less than 100 daN) or “4E” (for breaking strength at least equal to 100 daN), unless otherwise specified in ASTM D885 (2010).
• the tested samples are pulled over an initial length of 400 mm for 4D pliers and 800 mm for 4E pliers, 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.
• a very low preliminary torsion called "protection twist”, corresponding to a helix angle of about 6 degrees, before positioning and pulling in the clamps.
• the tenacity (force-rupture 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, 1 1 1 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 that occurs just after a standard pretension of 0.5 cN / tex.
• the elongation at break is indicated in percentage.
• the cellulosic 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, airplanes, other transport or handling vehicles.
• Figure 7 shows very schematically (without respecting a specific scale), a radial section of a tire according to the invention for example for tourism type vehicle.
• This tire 100 has a top 102 reinforced by a crown reinforcement or belt 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 on 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 disposed towards the outside of the tire 100 which is shown here mounted on its rim 109.
• the carcass reinforcement 107 is in known manner constituted by 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 bead to the other so as to form an angle of between 80 ° and 90 ° with the median circumferential plane (plane perpendicular to the axis of rotation of the tire which is situated halfway between the two beads 104 and goes 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 layers of rubber called "working plies” or “triangulation plies”, superimposed and crossed, reinforced with metal cables arranged substantially parallel to each other with respect to others and inclined relative to the median circumferential plane, these working plies may or may not be associated 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.
• this tire 100 of the invention has the essential feature that at least the shrinking web of its belt (106) and / or its carcass reinforcement (107) comprises a cellulosic textile cord according to the invention.
• the rods (105) which could consist, in whole or in part, of a cellulosic textile cord according to the invention.
• the rubber compositions used for these plies are conventional compositions for calendering textile reinforcements, typically based on rubber. natural or other diene elastomer, a reinforcing filler such as carbon black, a vulcanization system and the usual 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.
• the cellulosic textile cord of the invention has significantly improved tensile properties, as demonstrated by the following exemplary embodiments.
• 4 different tests were conducted with a total of 8 different textile cords, made of nylon or cellulose (rayon), conforming or not in accordance with the invention.
• the starting yarns are of course commercially available, for example nylon (M equal to about 440 cN / tex) sold by the company Kordsa under the name "T728", or by the company PHP under the names "Enka 140HRT or” Enka 444HRST ", for rayon (Mi equal to about 1000 cN / tex) by Cordenka under the name” C610-F Super2 ".
• toughness is the breaking force 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 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 parallel light LASER beam. with an accuracy of 0.1 micrometer.
• 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. Solidary of the moving table, the wire is moved perpendicularly to the shadow measurement system at a speed of 25 mm / s and orthogonally cuts the beam LASER. 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 0.
• control cords (denoted “T” in Table 1) are all characterized by a conventional double-twist construction T1, T2; the other cabled (comparative or in accordance with the invention) are all characterized by an unconventional construction with triple torsion Tl, T2, T3.
• T1 double-twist construction
• T2 cabled
• T3 triple torsion
• control cable C 1 the construction denoted by "N47 / - / 3/4" of the control cable C 1 signifies that this cable is a double-twist cable (T1, T2) which is obtained simply from a twisting operation (T2, D2 or S) of 4 different strands which were each prepared beforehand by a reverse twist operation (Tl, Dl or Z) of 3 nylon spun yarns (N) of title 47 tex.
• the textile cord concerned is a triple-twisted cord (T1, 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 Tl twist operation in the same direction Dl (Z).
• control cords (denoted "T") C1, C3, C5 and C7 are all characterized by a double twist construction; they were manufactured by assembly of 2, 3 or 4 strands according to a (second) final twist (denoted T2) of 180 to 260 t / m, corresponding to a torsion coefficient K2 of about 180 and a direction D2 (direction S ).
• T2 final twist
• Tl initial twist
• Dl meaning Z
• the cable example according to the invention C8 (also denoted “I” and in bold in Table 1) is characterized by a triple twist construction T1, T2, T3 (in these example, Z / Z / S); it was manufactured by assembly of 4 strands in a final twist (denoted T3) of 180 t / m, corresponding to a torsion coefficient K3 also of about 180 and a direction D2 (direction S).
• each of these strands had been previously manufactured by assembling three pre-strands according to a T2 twist (140 t / m) and an opposite direction Dl (Z direction), each of these pre-strands having been - Even prepared beforehand by a twist Tl (40 t / m) of a yarn on itself in the direction Dl (Z direction).

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• 2014
  • 2014-12-09 FR FR1462102A patent/FR3029540B1/fr not_active Expired - Fee Related
• 2015
  • 2015-12-07 WO PCT/EP2015/078836 patent/WO2016091810A1/fr active Application Filing
  • 2015-12-07 EP EP15805190.4A patent/EP3230502A1/de not_active Withdrawn
  • 2015-12-07 JP JP2017530124A patent/JP2017538051A/ja not_active Abandoned

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