Abstract:
A steel cord (10) adapted for the reinforcement of elastomer products, comprises a core filament (12) with a core filament diameter and 3N layer filaments (14, 16) twisted around the core filament (12) in the same direction and with the same step. N ranges from four to five. The 3N layer filaments are arranged in an intermediate layer of N filaments (14) and in an outer layer of 2N filaments (16). The layer filaments (14) in the intermediate layer have an intermediate layer diameter. The core filament diameter is smaller than the intermediate layer diameter.
Abstract:
The present invention provides structure of steel cord in heavy duty tires, in which the adhesive strength between filament and rubber, and penetrating property of rubber are improved by making the twist direction of core and strand different in the steel cord comprising core and strand filament, and by making the pitch or the twist period of core and strand different. In particular, this structure is applied to steel cord of 3+8*d(HT) which is used in heavy duty tires. In this application, twist direction of core filament is in the S direction and twist direction of strand filament is in the Z direction, and the ratio of the pitch of core filament (CP) and the pitch of strand filament (SP) is between 0.50 and 0.94.
Abstract:
The invention relates to a composite cord (10) for reinforcement of elastomers comprising a core (12) of a high polymer material, a first layer of steel filaments (14) twisted around said core and a second layer of steel filaments (16) twisted around said first layer. The polymer material is present in a sufficient volume to create gaps between adjacent filaments of the first layer and possibly also between the filaments of the second layer. The composite cord is characterised by a decreased fretting of the steel filaments.
Abstract:
[Object] A manipulation rope having an excellent torque transmittability is provided. [Solution] A manipulation rope 2 is a rope 2 that is advantageously used as a manipulation rope for a medical instrument, and includes a side wire 6 or a side strand which is an outermost layer, the side wire 6 or the side strand having a forming rate that is greater than 100% and not greater than 110%. The side wire or the side strand having been formed has a spiral shape in which a flatness that is an aspect ratio obtained by a major axis being divided by a minor axis is preferably not less than 1.01 and preferably not greater than 1.10. Further, an elongation of the rope at a time when a tensile load that is 1.0% of a breaking load is applied, is preferably not less than 0.04% and preferably not greater than 0.10%.
Abstract:
A composite twisted wire (1) which is obtained by twisting a plurality of strands. This composite twisted wire (1) comprises: an aluminum-covered strand (2) that is obtained by forming a coating film (2b), which is formed of aluminum or an aluminum alloy, on the surface of a steel wire (2a); and an aluminum strand (3) that is formed of aluminum or an allminum alloy. This composite twisted wire is reduced in weight, while exhibiting excellent tensile strength and excellent long-term stability with respect to electrical resistance. Consequently, this composite twisted wire is suitable, for example, for use as a wiring harness for auto-mobiles.
Abstract:
The invention relates to a method for producing a metal cord having three concentric layers (C1, C2, C3), of the type that is rubberized in situ, i.e. including a composition comprising rubber in the non-crosslinked state, known as "filling rubber". The cord comprises a first inner layer or core (C1), around which N strands of diameter d 2 are wound together in the form of a helix with a pitch p 2 to form an intermediate layer (C2), N varying between 3 and 12. In addition, P strands of diameter d 3 are wound together around this second layer in the form of a helix with a pitch p 3 to form a third outer layer (C3), P varying between 8 and 20. The method includes the following steps: a first step in which the core (C1) is coated with the filling rubber; a first step in which the N strands of the second layer (C2) are assembled and twisted around the thus coated core (C1), so as to form an intermediate cord, known as the "core strand" (C1+C2), at a point known as the "assembly point"; downstream from said assembly point, a second step in which the core strand (C1+C2) is coated with the filling rubber; a second step in which the P strands of the third layer (C3) are assembled and twisted around the thus coated core strand (C1+C2); and a final twist value balancing step. The invention also relates to the device used to implement one such method.