Abstract:
In a method of manufacturing a two-layer multistrand metal cord, N wires constituting an outer strand layer are wound in a helix around two wires constituting an inner strand layer, so as to form a strand. L>1 previously formed strands, which are incorporated as outer strands of an unsaturated outer cord layer of the cord, are wound in a helix around K>1 previously formed strands, which are incorporated as inner strands of an inner cord layer of the cord, to form a wound cord. The wound cord is overtwisted, the overtwisted cord is balanced so as to obtain zero residual torque in the overtwisted cord, and the balanced overtwisted cord is untwisted.
Abstract:
A hybrid rope (40) or a hybrid strand (50) comprising a core element (42, 52), a first (44, 54) and a second (46, 56) metallic closed layer surrounding said core element (42, 52). The core element (42, 52) includes a bundle of synthetic yarns. The first metallic closed layer (44, 54) includes a plurality of first strands of wires helically twisted together with the core element (42, 52) in a first direction. The second metallic closed layer (46, 56) includes a plurality of second wires or strands helically twisted together with said core element (42, 52) and said first metallic closed layer (44, 54) in a second direction. The cross-sectional area of the core element (42, 52) is larger than the total cross-sectional area of the first (44, 54) and second (46, 56) metallic closed layers. A corresponding method of producing such a hybrid rope or hybrid strand is also disclosed.
Abstract:
Multistrand metal cable of 4×(4+M) construction, which can especially be used for reinforcing tire belts for industrial vehicles, formed from four elementary strands assembled in a helix with a helix pitch P3, each elementary strand consisting of a two-layer cable of 4+M construction comprising an inner layer C1 formed from four wires of diameter D1, assembled in a helix with a pitch P1, and an unsaturated outer layer C2 of M wires, M being greater than or equal to 8 and smaller than or equal to 11, of diameter D2, these being assembled in a helix with a pitch P2 around the inner layer C1, P1 being smaller than P2, the four wires of the inner layer C1 being wound in a helix in the same twist direction as the M wires of the outer layer C2, and wherein each of the diameters D1 and D2 is greater than or equal to 0.10 mm but less than or equal to 0.50 mm.
Abstract:
A steel cord (30) with a high elongation at break of at least 5% comprises n strands (20), each of said strands (20) has m filaments (10) twisted together, n ranges from 2 to 7. m ranges from 2 to 9. The strands and the filaments are twisted in a same direction. The lay length of the cord is Lc and the lay length of said strand is Ls. The ratio of Ls to Lc (Ls/Lc) ranges from 0.25 to 1. Lc ranges from 16 mm to 26 mm. The strands are helically preformed. The E-modulus of the cord is more than 150000 N/mm2. The helical preforming of the strands allows to obtain a high elongation at break and a high E-modulus despite its long lay length Lc.
Abstract:
A steel cord (10) for reinforcing rubber product comprises at least one core strand (12) and outer strands (14), the outer strands (14) are helically twisted around at least one core strand (12). Each of the strands (12, 14) comprises core steel filaments (16, 20) with the number of m and outer steel filaments with the number of n. The diameter of the core steel filaments in the core strand is Dcc, the diameter of the outer steel filaments in the core strand is Doc, the diameter of the core steel filament in the outer strand is Dco, and the diameter of the outer steel filament in the outer strand is Doo. The ratio of Dcc/Doc is not less than 1.04, the ratio of Dco/Doo is not less than 1.03, and the ratio of Doc/Dco is not less than 1. The core steel filaments and outer steel filaments are polygonally preformed before being twisted into strands. The steel cord is used for reinforcing off-the-road tire.
Abstract:
The present invention relates to a method of accomplishment of a hybrid cord comprising an inner layer (1) in steel cord, an intermediate layer (2) in a high module and high toughness fibre and an outer layer (3) in a Polyolefin fibre. The present invention also refers to its application in an 8 (4×2) cords braided hybrid cable or any other type of hybrid cable presenting another construction, in braided or twisted cables.
Abstract:
Provided are a steel cord for reinforcing rubber whose fatigue resistance is increased more than ever to enable achieving high durability that was not conventionally realized, and a pneumatic radial tire including the steel cord as a reinforcement member.In a steel cord for reinforcing rubber having a double-twist structure that includes a plurality of strands twisted together in the same direction with the same pitch and including a central structure and at least one outer layer, the central structure is composed of at least two strands being twisted around each other and each being composed of at least seven filaments being twisted together. In a steel cord for reinforcing rubber including at least three core strands being twisted together and at least six sheath strands being twisted together around the core strands, the core strands and the sheath strands are twisted in the same direction.
Abstract:
A steel cord (10) comprises eight or more strands (12, 14) twisted together. Each of the strands has a substantially same cord twisting direction and a substantially same cord twisting pitch in the steel cord, and each of the strands consists of two to five individual filaments (16, 18) twisted together. Such a multi-strand steel cord can be manufactured without having to twist the individual strands separately and beforehand.
Abstract:
A metal cord having a core comprising one or more filaments for the reinforcement of rubber articles comprising a plurality of bundles of grouped filaments wherein the direction of lay of the filaments in the bundles is the same as the direction of lay of the bundles in the cord, each of the filaments having been subjected to plastic torsional deformation, and the average length of lay of each bundle in the cord being substantially equal to the average length of lay of each filament in the bundles, and wherein at any cross-section of the cord the filament or filaments which comprise the core of the cord differ along the length of the cord and belong to the same or different bundles.
Abstract:
Metal cables of improved fatigue strength, which are particularly suitable for use in an oblique folded ply of metal cables for tire tread reinforcement, comprise a visible outer layer of strands with each strand being formed of at least two elementary wires, the pitch of the strands being less than the pitch of the elementary wires, these two pitches being of the same direction (S or Z).