Abstract:
The invention relates to a multi-strand metal cord (C-1) having two layers (Ci, Ce) with a J+K construction, in particular for reinforcing the tyres of industrial vehicles, consisting of a core comprising J strand(s) forming an inner layer (Ci), J varying from 1 to 4, K outer strands being helically wound around said core at a pitch P κ of 20 to 70 mm, forming an outer layer (Ce) around said inner layer (Ci), each outer strand: comprising a cord (10) with two layers (C1, C2) with an L+M construction, rubberised in situ, comprising an inner layer (C1) consisting of L wires (11) with a diameter d 1 , L varying from 1 to 4, and an outer layer (C2) of M wires (12), M being no lower than 5, having a diameter d 2 helically wound together at a pitch p 2 around the inner layer (C1); and having the following characteristics (d 1 , d 2 and p 2 being given in mm): - 0.10 1 2 2 κ , the filling rubber (14) is present in each of the capillaries (15) delimited by the L wires (11) of the inner layer (C1) and the M wires (12) of the outer layer (C2) and, when L is equal to 3 or 4, the rubber is present in the central channel (13) delimited by the L wires (11) of the inner layer (C1); and the level of filling rubber in said outer strand is 5 to 40 mg/g of strand.
Abstract:
A steel cord especially useful for reinforcing the crown part of a tire, a steel cord being free from conventional production problems and capable of being produced with a constant quality and good efficiency, a rubber-steel cord composite and a tire using this. The steel cord which has a multiple-twist structure consisting of twisted N (N=2-8) strands (2) each formed by twisting a plurality of wires (1), and in which ϵc, defined by ϵc = √(-b/2+√(b2 /4-c))-1 (in the expression, b; -1+π2(-4R2+d2)/P2, c; π2 d2k(4π2 R2+P2)/P4, R; (D-d)/2, k; tan2(π/2-π/N)) when the diameter of the strand is d (mm), the diameter of circumscribing circle of the cord D (mm), and the twisting pitch of the cord P (mm), satisfies ϵc ≥0.005.
Abstract:
Stranded composite cables include a single wire (2) defining a center longitudinal axis, a first multiplicity of composite wires (4) helically stranded around the single wire in a first lay direction at a first lay angle defined relative to the center longitudinal axis and having a first lay length, and a second multiplicity of composite wires (6) helically stranded around the first multiplicity of composite wires in the first lay direction at a second lay angle defined relative to the center longitudinal axis and having a second lay length, the relative difference between the first lay angle and the second lay angle being no greater than about 4°. The stranded composite cables may be used as intermediate articles that are later incorporated into final articles,, such as overhead electrical power transmission cables including a multiplicity of ductile wires stranded around the composite wires. Methods of making and using the stranded composite cables are also described.
Abstract:
The present invention refers to a metal rope with improved features, in particular having high ultimate tensile strength and a high number of sustainable fatigue cycles. The metal rope (10) according to the present invention consists of a plurality of strands (12) wound around a central core (14) and is characterised in that the central core (14) is made of a fibre spun from a liquid-crystal polymer. Preferably, this fibre spun from a liquid-crystal polymer is Vectran ™ .
Abstract:
Individual elongate elements (wires 2 or strands 4) are drawn off stationary coils (21) in such a manner that the element (2,4) is elastically twisted. The elements (2,4) are guided to a stationary closing means (23) in which a bundle of the elements is formed, the elements immediately before being formed into the bundle being substantially free from any curvature that will result in residual slackness in the elongate member (1,3) being manufactured. The bundle is withdrawn from the closing means (23) and is simultaneously rotated about its axis so as to form the elongate member (strand 1 or rope 3) and substantially untwist the elongate elements (2,4). The product can be at least 300 m long.
Abstract:
A product comprising a plurality of interlaced yarns wherein at least a first yarn having a tensile strength, having a value TS in N/tex, said first yarn containing a plurality of UHMWPE fibers having a titer, having a value T in den, wherein the ratio T/TS is at least 5 den.tex/N. The tensile strength is obtained by adjusting the drawing ratio or the UHMWPE filaments/fibers accordingly. The product shows resistance to abrasion. The product can be a rope or round slings, comprising a sheath/jacket comprising said first yarn.
Abstract:
A rope comprising polyethylene elongate elements oriented in the length direction of the rope wherein for at least part of the elongate elements the distance of the element to a central longitudinal rope axis varies over the length of the rope, the polyethylene elongate elements comprising tapes of ultra-high molecular weight polyethylene, the tapes having a width to thickness ratio of at least 10 and a polymer solvent content below 0.05 wt.%. The distance of at least part of the elements to the central longitudinal rope axis varies over the length of the rope between a longitudinal line which is at most 30% from the outside of the rope and a longitudinal line which is at most 30% from the central longitudinal axis of the rope. A rope with these properties, shows a high strength-strength ratio, defined as the ratio between the strength under use conditions and the fresh strength of the rope. A strength-strength ratio of at least 50%, preferably at least 70%, in particular at least 80% can be achieved.