Abstract: Pneumatic tires are rendered less susceptible to blow or blister defects by providing, in at least one cord reinforcement ply of a tire, a plurality of gas absorbing cords with the reinforcement cords and gas absorbing cords lying in the same general plane and with the gas absorbing cords consisting of staple hollow filaments. The gas absorbing cords may be used as fill yarn in weaving fabric employing parallel reinforcement cords.

Abstract: A pneumatic radial tire for automotive vehicles comprising a least one rubber coated steel cord consisting of a pair of intertwisted filaments and having a flatness ratio f in the range of 0.6.ltoreq.f .ltoreq.0.9, where f is defined by 2d/h, where d is a diameter of a filament and h is the maximum diameter of the flattened 1.times.2 cord. This cord is obtained by deforming the cord with a force applied transversely and unidirectionally over its length.

Abstract: A steel cord comprising a core and a sheath arranged around the core. The core consists of two steel filaments, and the sheath consists of eight steel filaments. The diameter of each of the filaments is in a range from 0.30 to 0.42 mm, and a difference D.sub.c -D.sub.s between the diameter D.sub.c of the filaments of the core and that D.sub.s of the sheath is not less than 0.04 mm. The twisted direction of the core is the same as that of the sheath, and a ratio P.sub.s /P.sub.c between a pitch P.sub.s of the sheath and that of P.sub.c of the core is in a range from 1.4 to 3.0.

Abstract: A steel strip (1) comprises two to seven round steel filaments (2) lying in parallel adjacent to one another so as to form a single plane of core filaments and one or more filaments (4) which are wrapped around the core filaments in one single wrapping direction. One or more core filaments, individually, or the plane of the core filaments as a whole have residual elastic torsions to such an extent that the strip remains substantially flat over the whole length of the strip if the strip is not subjected to external forces.

Abstract: An apparatus for calendering cords with elastomeric material which has a main guide board and guide rolls located at the entrance side of the main guide board, with the guide rolls being located along columns of holes in the main guide board and being freely rotatably supported, the guide rolls making the inclined angles of cords, relative to the centerline of the holes, smaller near the holes in order to reduce the friction between the cords and the holes so as to consequently reduce the problem of curling of the coated cords.

Abstract: A steel cord is disclosed for use in reinforcing rubber products, especially automobile tires. In order to provide desirable rubber penetrability and break-resistance, three to six material wires are intertwisted into a steel cord having an elliptically shaped cross section having a ratio of its major diameter to its minor diameter of between 1.1 and 2.2. The cord is formed such that its material wires substantially contact each other near the ends of the major axis of the ellipse and are separated from each other near the end of the minor axis. The cord of the invention is normally formed such that a ratio the twist pitch to the material wire diameter is in the range of 30-80. However, if a high elongation of more than 5% is necessary, such can be imparted by intertwisting material wires such that the ratio of the twist pitch to the material wire diameter is in the range of 10-28.

Abstract: An improved steel cord for reinforcing rubber is formed of three steel filaments, one having a smaller diameter than the other two, twisted together. The thinner filament is twisted with the two filaments at least partially in contact with them and with the same pitch. When the steel cord is cut at both ends, the thinner filament is retracted inwardly from the ends of the two filaments. This improves the penetration of rubber into the cord and prevents edge separation.

Abstract: A pneumatic tire bead is formed into a spiral coil consisting of a plurality of convolutions or turns of wire. The wire may be round, square, oval or hexagonal in cross section. A crimp or offset bend is made in each of the convolutions a distance of one wire width or a fraction of the wire width in each full 360 degree wire turn such that the ends of the bead wire permit the bead side walls to remain in flat parallel planes. This offset relationship reduces nonuniformity in the tire heretofore produced by spirally wound wire beads. The bead wire can be wound in a vertical plane or in a radial spiral clock-like spring fashion. In another embodiment a pair of mirror image offset coils are joined together to form a composite bead preferably for use in heavy duty applications. In still another embodiment a single flat hoop may be placed between a pair of mirror image offset coils to increase resistance to circumferential distortion.

Abstract: A polyamide yarn having on the surface of the polyamide yarn a hydrophobic organic ester dip penetration regulator having a melting point greater than 27.degree. C. and convertible by conventional means into a tire cord having low stiffness and high air permeability and a process for making polymeric tire yarns is disclosed.

Abstract: A pneumatic radial tire including at least one ply of carcass layer comprising a number of cords disposed at right angle with respect to a circumferential direction of the tire and anchored at a pair of beads, said cords of the carcass layer being treated with adhesive treating agents, i.e. an epoxy treating agent and a RFL treating agent, at the stage of both yarns and cords, said cords being formed by twisting at least two treated strands which are formed by twisting yarns treated with both the epoxy treating agent and the RFL treating agent and said cords being further treated with at least the RFL treating agent.

Abstract: An assembly (100) for the reinforcing of an article of plastic and/or rub, characterized by the following features:(a) it comprises two adjacent concentric layers (1, 2) of filaments (10, 20), the filaments (10, 20) having their axis (O.sub.1, O.sub.2) arranged, within each of the layers, substantially on a circle (C.sub.1, C.sub.2) of radius R.sub.1, R.sub.2 ; in each layer (1, 2) the filaments (10, 20) are wound in the same direction and have the same pitch (P.sub.1, P.sub.2);(b) the layers (1, 2) have the same direction of winding;(c) R.sub.1, R.sub.2, P.sub.1, P.sub.2 are in accord with the relationship:P.sub.1 >P.sub.2 >P.sub.1 .times.[1-2(R.sub.2 -R.sub.1)/R.sub.2 ].Articles reinforced by such assemblies, for instance pneumatic tires.

Abstract: A protective garment 10, such as a glove, arm guard or the like of wire 24 and fiber strands 26, 28, 30 and an elastomeric coating 16. The preferred garment is knitted from yarn 12 having a core 22 of one or more wire strands 24 and a fiber strand 26, and two wrappings of fiber strands 28, 30, preferably polyester. The knitted garment is coated, preferably by dipping in nitrile rubber, and the coating is cured in place. The garment is highly cut-resistant, nonabsorbent, highly slip-resistant, liquid in weight and flexible.

Abstract: Polyethylene terephthalate yarn is prepared by spinning under very high-stress conditions wherein oriented-crystalline undrawn yarns are obtained. Selection of process parameters yields a partially oriented semicrystalline undrawn yarn with a crystallinity of 16 to 24 percent and a melting point elevation of 14.degree. to 22.degree. C. which is drawn to produce the resulting unique combination of properties: (A) a terminal modulus of at least 20 g/d, (B) a dimensional stability defined by E.sub.4.5 +FS<11.5 percent, (C) a tenacity of at least 5 grams per denier, (D) a melting point elevation of 14.degree. to 22.degree. C., preferably 17.degree. to 20.degree. C., and (E) an amorphous orientation function of less than 0.75. The resulting treated tire cord unexpectedly provides high ultimate elongation and high toughness in combination with improved dimensional stability.

Abstract: One or more plies of reinforced elastomer, particularly two plies (10),(12) of rubber reinforced with twisted filament metallic cords (14) and more particularly a tire belt made up of the two plies (10),(12) is disclosed having cords (14) of 2x.30HT construction with opposed 23.degree. angles to the direction of reinforcement of the belt.

Abstract: A steel cord for the reinforcement of rubber articles is disclosed, which comprises a central base structure composed of 1 to 4 steel filaments, and at least one coaxial layer composed of plural steel filaments arranged around the central base structure so as to adjoin them to each other, these steel filaments being twisted in the same direction at the same pitch. In the steel cord of this type, the steel filaments constituting the central base structure have the same diameter (dc), while at least one steel filament of the coaxial layer has a diameter (dso) smaller than the diameter (dc) of the steel filament in the central base structure.

Abstract: Disclosed is a polyethylene terephthalate untwisted multifilament which satisfies the following requirements (A), (B), (C) and (D);(A) the intrinsic viscosity [IV] is 0.97 to 1.15;(B) the amorphous orientation function [fa] is not larger than 0.55;(C) the tenacity [T] (g/d), the shrinkage [.DELTA.S] (%) as measured after standing in dry air at 150.degree. C. for 30 minutes, the medium elongation [ME] (%) under a load of 4.5 g/d, and the dimensional stability index [Y] expressed by the formula: Y=ME.sup.0.81 +.DELTA.S+1.32 are within ranges defined by the following formulae (a), (b), (c), (d) and (e):0.33Y+5.55.ltoreq.T.ltoreq.0.33Y+6.50 (a),8.0.ltoreq.T.ltoreq.9.5 (b),8.5.ltoreq.Y.ltoreq.10.5 (c),5.ltoreq.ME.ltoreq.10 (d),and2.ltoreq..DELTA.S.ltoreq.g (e);and (d) the elongation at break is at least 11% and the product of the tenacity and elongation, which is defined by: ##EQU1## is 30 to 36.

Abstract: High strength polyester multifilament yarn of improved dimensional stability, which has the proper combination of an intrinsic viscosity of at least 0.90, relatively low work loss and a high degree of toughness, is incorporated as tire cord into a rubber tire for reinforcement to provide an important improvement in fatigue life and retained fatigue strength. The continuous melt-spin process comprises the steps of feeding prepolymer to a first finisher vessel to achieve at least 0.4 intrinsic viscosity transferring polymer to a second finisher vessel for a period sufficient to achieve an intrinsic viscosity of at least 0.95, and supplying this polymer to an extrusion spinnerette.

Abstract: A heavy duty pneumatic radial tire including between a tread and at least one carcass layer, at least two belt layers, wherein an outermost belt layer disposed most closely to the tread out of all belt layers comprises a steel cord which has a cord structure of 2+7 made of an element wire having a carbon content of 0.77 to 0.92% by weight and a diameter d of 0.28 to 0.40 mm and which has a tenacity at break of (1700.about.2050)d.sup.1.872 (kgf/cord) and a ratio of an elongation at break .epsilon. to P.L.E., .epsilon./P.L.E., of at least 30, and a coat rubber having a 50% modulus of 10 to 40 kg/cm.sup.2, and wherein the outermost belt layer has a thickness of at least 1.67 times the minor diameter but at greatest 1.79 times the major diameter, of the steel cord.

Abstract: A tire steel cord formed of more than three strands twisted together, at least one of the strands being marked so as to formed therein with zig-zagging marked parts which form gaps between strands, rubber accordingly immersing the steel cord into its center part through the thus formed gaps so as to fill in a cavity in the center part of the steel cord.

Abstract: A heavy duty radial tire comprises a tread portion, a pair of sidewall portions, a pair of bead portions, a carcass of at least two plies and a breaker, wherein each ply is composed of cords of aromatic copolyamide fiber having particular units A and B and a specific rubber composition having 100% modulus of 35-50 kg/cm.sup.2.

Abstract: Low profile radial tires for trucks and buses reinforced with steel cords which comprise two layers of a core and an outer layer, the number of core filaments being 3 to 4 and the number of outer filaments being equal to or less than the number 5 greater than the number of the core filaments, all filaments being substantially equal in diameter and both the core filaments and the outer filaments being twisted in the same direction with a different pitch, and the aspect ratio of the tire being at most 0.85.

Abstract: A conjugated fiber having a sheath-core conjugated structure comprising a polyester core component composed mainly of polyethylene terephthalate and a polyamide sheath component composed mainly of polyhexamethylene adipamide, is disclosed, which has excellent mechanical properties such as a high tenacity, a high modulus, and an improved dimensional stability, and an improved adhesion to a rubber, especially a high-temperature adhesion, an improved heat resistance in a rubber, and a high fatigue resistance, and thus is useful as an industrial material. By adopting a high-speed spinning procedure in the fiber preparing process, the peel resistance in the interface of the sheath-core conjugated structure is greatly improved, and the following valuable characteristics not possessed by conventional conjugated yarns can be obtained:(1) Excellent adhesion and high-temperature adhesion comparable to those of a polyamide, which cannot be obtained in a polyester.

Abstract: High strength polyester multifilament yarn of improved dimensional stability, which has the proper combination of an intrinsic viscosity of at least 0.90, relatively low work loss and a high degree of toughness, is incorporated as tire cord into a rubber tire for reinforcement to provide an important improvement in fatigue life and retained fatigue strength. The continuous melt-spin process comprises the steps of feeding prepolymer to a first finisher vessel to achieve at least 0.4 intrinsic viscosity transferring polymer to a second finisher vessel for a period sufficient to achieve an intrinsic viscosity of at least 0.95, and supplying this polymer to an extrusion spinnerette.

Abstract: A pneumatic tire reinforced by steel cords embedded as a reinforcing layer in rubber is disclosed in which each of the steel cords has a multilayer structure composed of a core layer made of a number of element wires twisted together, and at least one sheath layer made of a larger number of element wires surrounding the core layer. The ends of some of the element wires are located at a distance of 1 to 10 mm from those of the other element wires in the longitudinal direction of each of the steel cords at the end portion thereof so that the end portion is unflat.

Abstract: Strand for application as reinforcement in objects of polymer material comprising at least one core and less than six outside wires arranged round it, the core having an outside diameter larger than the diameter of the circle tangent to each of the outside wires in the hollow space that remains free when their cross-sections have the highest packing density and smaller than the diameter of the outside wires, whereby the outside wires are made of carbon steel wire with a tensile strength of at least 2250-1130 log d N/mm.sup.2, d being the wire diameter in mm.

Abstract: In a heavy duty radial tire, metal cords of a single layer construction obtained by twisting 3.about.5 metallic filaments having a filament diameter of 0.13.about.0.32 mm, each of which cords having an elongation P.sub.1 under a load of 0.25.about.5 kgf/cord of 0.35.about.1.0% as an arithmetic mean value are arranged as a carcass ply so that a distance between cords at an end of the carcass ply is not less than 0.25 mm. Thus, it is possible to largely reduce the tire weight, avoid problems on the operability such as bead rising and the like, and considerably improve the fracture resistance, corrosion fatigue resistance and fretting resistance at carcass ply end as well as resistance to external damage in sidewall (resistance to cord breaking up) of the radial tire.

Abstract: A metal cord for reinforcing elastomeric articles, such as earth mover tires, comprises a plurality of metal wire-filament strands, including a center strand and multiple peripheral strands concentrically surrounding the center strand. Each of the center and peripheral strands includes multiple individual wire filaments of similar diameter having identical strand lay direction and length. Each strand has a hexagonally close-packed longitudinally uniform polygonal outline in which filaments are in concentric layers, with each individual filament being tangential to all adjacently surrounding filaments. The peripheral strands are tangential to the center strand and have a predetermined cord lay length and direction either the same as (Lang's Lay) or opposite to that of the center strand.

Abstract: A steel cord for reinforcing rubber is made by twisting a plurality of strands each made by twisting a plurality of element wires. The cord and the strands are twisted in the same direction. The product of the twisting ratio of the cord and that of the strands, the elongation coefficient of the cord and other factors are determined so that the rubber penetration and the rigidity and tenacity of the cord will be suitable for the carcass cord of steel radial tire.

Abstract: A wire strand for reinforcing elastomers such as tires and conveyor belts comprises multiple individual filaments bundled in a core and an outer layer on a common axis. Each individual filament is tangential to all adjacent surrounding filaments and all filaments have identical lay direction and length in a hexagonally close-packed cross section, which is to say that the strand filaments are of bunched configuration. In accordance with the invention, the outer layer includes filaments of differing diameters so disposed with respect to each other and with respect to the filaments of the core that the outer edges of all filaments in the outer layer, viewed cross sectionally, lie substantially on a common radius from the strand axis.

Abstract: A steel cord for the reinforcement of rubber products and the like has an open twisted structure comprised of 3 to 6 steel filaments each having an ellipsoidally helical shape, and has a particular tensile elongation under a load of 5 kg.

Abstract: A pneumatic tire is reinforced with cords made of polyvinyl alcohol based fibers, and meets the following requirements:(1) A tenacity, S (g/d) of the cords taken out from the tire meets a relation: S.gtoreq.14.5-12N.sub.T in which N.sub.T is a coefficient of twist, which is represented by N.sub.T =N.times..sqroot.0.139.times.D/.rho..times.10-3. N, D and .rho. are a number of twist (turns/10 cm), a half of a total denier of the cords, and a specific density of the cords, respectively.(2) A tenacity-retaining percentage of the cords in an absolutely dried state is not less than 90% of that before the treatment with boiling water. The absolutely dried state means that after the cord is treated with boiling water at 120.degree. C. while being maintained at a constant length, the cord is dried.

Abstract: Very high strength cords are made and described which are composed of a core and a sheath of twisted yarns plied around the core in such a way that the cord exhibits greatly improved retained strength after use.

Abstract: This invention relates to metal wire used to produce reinforcing elements for articles of elastomeric material. The wire is provided with a coating ensuring at the same time a good resistance to corrosion, good values of initial adhesion, and a low decay, due to ageing, of the bond with the elastomeric material, said coating being constituted by two concentric layers of a Zn/Ni alloy, where the radially inner layer contains Zn in an amount ranging between 60% and 90% based on total layer and the radially outer layer contains Ni in an amount ranging between 60% and 80% based on the total layer.

Abstract: This invention discloses a copolyester which has been found to be optically anisotropic in the melt and which readily undergoes melt processing to form quality fibers and molded articles. These copolyesters are particularly suitable for use in making tire cord which has an outstanding combination of properties including tenacity, modulus, toughness and flex life. This invention specifically reveals a copolyester which is comprised of repeat units which are derived from (A) at least one member selected from the group consisting of phenyl hydroquinone, hydroxy benzoic acid and hydroxy naphthoic acid; (B) at least one diol selected from the group consisting of 1,4-bis(4-hydroxycumyl) benzene, 1,3-bis(4-hydroxycumyl) benzene, alkyl substituted 1,4-bis(4-hydroxycumyl) benzene, and alkyl substituted 1,3-bis(4-hydroxycumyl) benzene; and (C) a diacid component which is comprised of terephthalic acid and optionally up to about 10 mole percent isophthalic acid.

Abstract: A reinforcing cable (40) comprises at least two yarns (41,42,43) each of which consists only of aramid filaments, and a single core yarn (44) which consists only of filaments selected from the group consisting of polyamides having a structure which is at least partially oriented and polyesters having a structure which is at least partially oriented. The aramid yarns (41,42,43) are adjacent to one another and twisted about the core yarn (44) to manufacture a cable (40), but the aramid yarns are not twisted about one another. Articles of manufacture, such as tires, which contain the new cables are also disclosed.

Abstract: A carbon fiber cord for rubber reinforcement comprising a carbon fiber bundle having coated thereon from 5 to 50% by weight, based on the total weight of the carbon fiber bundle thus treated, of a resin composition comprising a mixture of 100 parts by weight of a butadiene-acrylonitrile copolymer having a carboxyl group on at least both terminals of the molecule of the copolymer and from 5 to 40 parts by weight of an epoxy resin, or a reaction mixture obtained therefrom, and a curing agent for the epoxy resin, and further coated thereon from 0.5 to 5% by weight, based on the total weight of the carbon fiber bundle and the resin composition coated thereon, of a mixture of a phenolformalin-rubber latex type adhesive for rubber. The carbon fiber cord exhibits excellent adhesion to rubber and fatigue resistance.

Abstract: A composite reinforcing rope is made of a cylindrical core of twisted filaments of aromatic polyamides around which a plurality of steel wires of a rectangular configuration are coiled. The steel wires are wound side-by-side in one layer. Each wire is twisted around its own axis to such a degree that its broader side fully engages the periphery of the polyamide core. The edges of respective wires are rounded whereby the convex narrow dides of adjoining wires contact one another substantially along a line.

Abstract: A nonmetallic cable (20) having utility in an overlay ply (39) of a tire (10) comprises two yarns (21,22). One of the yarns (21,22) has a yarn twist of either zero or is twisted in a first direction. The other yarn (21,22) has a yarn twist that is not zero, but is twisted in a direction opposite to the direction of yarn twist in the first yarn (21,22). The cable (20) has a cable twist that is opposite in direction to the twist of the yarn (21,22) having the larger of the two yarn twists. The cable has an elongation of 4% when it is subjected to a force of not greater than 12 Newtons. A tire (10) having a belt structure (30) has an overlay (39) comprising said cables disposed radially outwardly of at least one of the belt plies (31-35).

Abstract: A reinforcing strip, and method of making same, specifically adapted for use in reinforcing plies in the belt of rubber tires. The strip comprises a number, preferably 4 to 7, of parallel wires, tightly bound together by a wrapping wire or a binder. This strip form allows to combine the advantages of steel strip, i.e. high lateral and low radial stiffness and thinner piles, with those of conventional steel cord, i.e. high tensile strength and fatigure resistance.

Abstract: An improved yarn, fabric and protective garment made from such yarn where the yarn, fabric and garment exhibit increased cut resistance. The yarn includes a core made of fiber and a covering wrapped around the core, the covering includes at least one strand of wire wrapped around the core.

Abstract: A metal cord is constructed by twisting three metal filaments in the same direction, and satisfies Lmax.gtoreq.1.05d, Lmin.gtoreq.1d and Lmax/Lmin.gtoreq.1.05 (Lmax : center distance between longest separated metal filaments, Lmin : center distance between shortest separated metal filaments, d : diameter of metal filament), and has specified twisting pitch and elongation under a load of 5 kg/cord. A pneumatic tire comprises a belt composed of plural belt layers each containing the above metal cords arranged at a given inclination angle with respect to the circumferential direction of the tire.

Abstract: Textile cables (10) used for reinforcing tires comprise a plurality of yarns (11, 12, 13) which each consist of a plurality of aramid filaments (14) and each yarn has a twist imparted thereto. The yarns (11, 12, 13) are twisted together with one another to form cables (10). The twist ratio and the twist multiplier of the cable are dependent upon the intended end use of the cable. If the cable (10) is to be used in a high flex application, such as a reinforcing element in a carcass ply of a tire, the twist ratio is in the range of 1.0 to 1.9, and the twist multiplier is in the range of 8 to 12. If the cable (10) is to be used as a reinforcing element in the tread reinforcing structure of a tire, where there is some flexing but strength is very important, the twist ratio is in the range of 1.0 to 3.0, and the twist multiplier is in the range of 5 to 7. A preferred spacing between the cables is also disclosed.

Abstract: A steel cord comprises a central bundle of three twisted steel filaments (1) with a diameter d.sub.1 and nine steel filaments twisted around said central bundle with the same twist pitch and twist direction as the central bundle. Three filaments (2) of said nine steel filaments have a diameter d.sub.2 and contact two adjacent steel filaments of the central bundle. Six steel filaments (3) of said nine steel filaments have a diameter d.sub.3 and contact both one steel filament of the central bundle and one steel filament of the three filaments with diameter d.sub.2. The ratio d.sub.2 /d.sub.1 is greater than 1.05 and smaller than 1.16. The raio d.sub.3 /d.sub.1 is greater than-0.205=0.814.times.d.sub.2 /d.sub.1 and smaller than-0.105+0.814=d.sub.2 /d.sub.1.

Abstract: A steel cord comprises at least nine filaments which are twisted in substantially the same direction with substantially the same pitch. A coil formed by each filament has a diameter which is variable along the cord central line. Most of the filaments are interwined with one another without forming layers.

Abstract: A strand for reinforcing objects made of polymer material comprising at least one core wire and less than six outside wires arranged round it, the core wire having an outside diameter larger than the diameter of the circle tangent to each of the outside wires in the hollow space that remains free when their cross-sections have the highest packing density and smaller than the diameter of the outside wires, whereby the outside wires are made of carbon steel wire with a tensile strength of at least 2250-1130 log d N/mm.sup.2, d being the wire diameter in mm. The core wire has a tensile strength less than 2250-1130 log d N/mm.sup.2.

Abstract: A pneumatic tire includes a composite rope made of a cylindrical core of twisted filaments of aromatic polyamides around which a plurality of steel wires of a rectangular configuration are coiled. The steel wires are wound side-by-side in one layer. Each wire is twisted around its own axis to such a degree that its broader side fully engages the periphery of the polyamide core. The edges of respective wires are rounded whereby the convex narrow sides of adjoining wires contact one another substantially along a line.

Abstract: Tire cord having enough high tensile strength, high initial modulus, and high fatigue resistance required for radial tire and belted bias tire can be obtained from polyvinyl alcohol polymer. Said cord is constituted by multifilament yarns composed of a polyvinyl alcohol polymer having a degree of polymerization of at least 2000, having a tensile strength of 15 g/d or more and an initial modulus of 250 g/d or more, and undergoing substantially no fusion between single filaments. It has cord properties of not less than 8.5 g/d in tensile strength, 0.5 to 2.2% in middle degree of elongation (MDE), and 0.2 to 2.0% in dry heat shrinkage factor (.DELTA.S).

Abstract: A power transmission belt having a load carrier in which a twisted cord of synthetic fiber such as polyester fiber or of inorganic fiber such as glass fiber is embedded. Said load carrier is made by final twisting a plurality of twisted yarn (one or plural single yarns first twisted) in the direction contrary to the first twisting direction. The first twisting angle should be in the range between 87.degree. and 93.degree. and the final twist multiplier should preferably be in the range between 400 and 1,600.

Abstract: A steel cord for the reinforcement of rubber articles is disclosed, which comprises a central base structure composed of 1 to 4 steel filaments, and at least one coaxial layer composed of plural steel filaments arranged around the central base structure so as to adjoin them to each other, these steel filaments being twisted in the same direction at the same pitch. In the steel cord of this type, the steel filaments constituting the central base structure have the same diameter (dc), while at least one steel filament of the coaxial layer has a diameter (dso) smaller than the diameter (dc) of the steel filament in the central base structure.

Abstract: Rubber-reinforcing polyamide fiber cords are disclosed which are each obtained by primarily twisting an aromatic polyamide filament yarn, doubling a plurality of thus primarily twisted yarns and finally twisting doubled yarns in a twisting direction opposite to that of the primary twist yarn to obtain a plied yarn, and applying a rubber adhesive to the thus obtained plied yarn. N and M satisfy the following relation: 1.05.ltoreq.M/N.ltoreq.1.6 in which N and M are the number of primary twists and the number of the twists in the cord, respectively.