Abstract:
A steel cord (200) is described that is simple and cost effective to produce while solving some particular problems for the reinforcement of elastomer belts such as timing belts or the like. The cord (200) is a single lay cord that comprises a core filament (202), around which a first layer and a second layer of filaments (204, 210, 212) is twisted, all filaments being twisted with the same lay length and direction. By appropriate choice of the lay length, the core filament diameter and the filament diameters of the first layer—the latter being larger or equal to the former—an aggregate gap can form in which intermittently a filament (210′) of the second layer gets entrained. This aggregate gap must be between 40 and 70% of the core filament diameter in order to obtain the desired effect of having a core filament (202) that is deformed with the same lay length and direction as the other filaments (204,210,212). A deformed core filament (202) suppresses the effect of core filament migration. In addition the exceptional rough aspect of the cord (200) leads to good mechanical anchorage in the elastomer. Also the load exerted on the cord (200) is better distributed over all filaments. The use of the cord is not limited to timing belts: an advantageous use of the cord in tyres, hoses, hoisting belts, drive belts and reinforcing strips is anticipated.
Abstract:
A pneumatic tire includes metal cords each made of metal filaments twisted together, the metal cords having an initial elongation in a range of from 0.05 to 0.20% and a standard deviation of the initial elongation in a range of not more than 0.02. A method of manufacturing the metal cord comprises shaping metal filaments in a two-dimensional zigzag waveform, and twisting the shaped metal filaments together, wherein the number of the filaments is in a range of from 8 to 12, the metal filaments have the same diameter (d) of from 0.15 to 0.30 mm, the shaped metal filaments have the same zigzag waveforms, the zigzag waveform of each said shaped metal filament has constant wave lengths (P) and constant wave heights (h) wherein the ratio (P/d) is in the range of 100/3 to 700/3, and the ratio (h/d) is in the range of 5/3 to 80/3.
Abstract translation:充气轮胎包括金属丝,金属帘线由金属丝绞合在一起,金属帘线的初始伸长率在0.05至0.20%的范围内,初始伸长率的标准偏差不大于0.02。 一种制造金属帘线的方法包括以二维之字形波形成形金属丝,并将成形的金属丝捻合在一起,其中细丝的数量在8至12的范围内,金属细丝具有相同的直径 (d)为0.15〜0.30mm,成形金属丝具有相同的之字形波形,每个所述成形金属细丝的之字形波形具有恒定波长(P)和恒定波高(h),其中比率(P / d )在100/3〜700/3的范围内,比率(h / d)在5/3〜80/3的范围内。
Abstract:
A steel cord that is especially useful for reinforcing a crown portion of a tire is provided. In particular, a steel cord free from manufacturing problems existed in the conventional art and allowing for stable quality and good production efficiency is provided, and a rubber-steel cord composite and a tire that are equipped with the same are provided.A steel cord has a multiple-twist structure including N (N=2 to 8) strands 2 that are twisted together, each strand 2 having a plurality of wires 1 that are twisted together. When the diameter of each strand is denoted by d (mm), the diameter of a circle circumscribing the cord is denoted by D (mm), and the twisting pitch of the cord is denoted by P (mm), εc defined by the following expression, εc=√(−b/2+√(b2/4−c))−1 (where b denotes −1+π2(−4R2+d2)/P2, c denotes π2d2k(4π2R2+P2)/P4, R denotes (D−d)/2, and k denotes tan2(π/2−π/N)), satisfies εc≧0.005.
Abstract:
The present invention relates to a three-layered metal cable of construction L+M+N usable as a reinforcing element for a tire carcass reinforcement, comprising an inner layer C1 having L wires of diameter d1 with L being from 1 to 4, surrounded by an intermediate layer C2 of M wires of diameter d2 wound together in a helix at a pitch p2 with M being from 3 to 12, said layer C2 being surrounded by an outer layer C3 of N wires of diameter d3 wound together in a helix at a pitch p3 with N being from 8 to 20, said cable being characterised in that a sheath formed of a cross-linkable or cross-linked rubber composition based on at least one diene elastomer covers at least said layer C2. The invention furthermore relates to the articles or semi-finished products made of plastics material and/or rubber which are reinforced by such a multi-layer cable, in particular to tires used in industrial vehicles, more particularly heavy-vehicle tires and their carcass reinforcement plies.
Abstract:
A steel cord (10) adapted for the reinforcement of elastomers comprises: a core steel filament (12) with a core steel filament diameter dc and coated with a polymer (14); six intermediate steel filaments (16) with an intermediate steel filament diameter di smaller than or equal to the core steel filament diameter dc; these intermediate steel filaments (16) are twisted around the core steel filament (12); ten or eleven outer steel filaments (18) with an outer steel filament diameter do smaller than or equal to the intermediate steel filament diameter dl; these outer steel filaments (18) are twisted around the intermediate steel filaments (16), the outer steel filaments (18) are preformed in order to allow rubber penetration inside the core (10). The core steel filament (12), the intermediate steel filaments (16) and the outer steel filaments (18) all have a tensile strength at least 2600 MPa. The cord (10) has an outer diameter D according to following formula: D≦dc+2×di+2×do+0.1 wherein all diameters are expressed in millimeter (mm).
Abstract:
A steel cord comprises a core with one or more core steel filaments and further comprises a first layer of intermediate steel filaments twisted around the core, and a second layer of second steel filaments twisted around the first layer. At least one of the intermediate steel filaments is individually coated by means of a polymer with a minimum thickness of 0.010 mm. The polymer reduces the fretting between the coated intermediate steel filaments and the other steel filaments and makes the steel cord suitable for reinforcement of carcass plies of a tire.
Abstract:
The present invention relates to a metal cable usable for reinforcing a carcass reinforcement for a tire, such as a heavy-vehicle tire, to a composite fabric usable as a ply for such a carcass reinforcement, to a carcass reinforcement comprising this fabric and to a tire incorporating this carcass reinforcement. A metal cable according to the invention comprises a textile wrap, and is such that said wrap is formed of an aromatic thermotropic polyester or polyester amide. A composite fabric according to the invention is such that it comprises a rubber composition which is reinforced by said cables. A tire according to the invention has its carcass reinforcement comprising said composite fabric.
Abstract:
A reinforcing structure designed for handling compression stress states when the structure is molded into a composite. The structure, specifically a wrapped cord with metallic filaments contained therein, is suitable for both compression and tension load forces. The reinforcing structure has a core comprising a plurality of essentially straight, nested filaments arranged in parallel, the filaments forming a line of contact with adjacent filaments that extends along the length of the filaments. Wrapped about the core is at least one helically wound wire.
Abstract:
The invention improves rubber permeability while making a cord diameter compact. A metal cord is constituted by a layered structure having a core comprising totally 6 to 12 filaments sectioned into 1 to 4 filament bundles, and a sheath comprising 8 to 15 filaments arranged around the core. Each of the filament bundles includes a waved filament modeled in a two-dimensional wave shape and a non-waved filament, in a state before being bundled. The core makes the wave of the waved filament three-dimensional within the core by applying torsion to each of the filament bundles.
Abstract:
The invention includes a composite cable having a plurality of strands (10, 12) stranded around a composite synthetic core (5) with a concentric structure. The core (5) has a nucleus (11) formed by a bundle of parallel synthetic fibers extending along the cable longitudinal direction, and of a compact thermoplastic sheath (13) enclosing the nucleus (11) and serving as winding support for the strands.