Sumitomo Electric Industries, Limited

Sumitomo (sei) Steel Wire Corp.

Sumitomo Rubber Industries Limited

Sumitomo Electric Tochigi Co., Ltd.

Nippon Steel Sumitomo Metal Corporation

Kenichi Okamoto

Hidekazu Nakata

Yuichi Sano

Yasuo Sakai

Hitoshi Wakahara

Shinichi Miyazaki

Keisuke Aramaki

Junichi Kodama

Kazuhiko Kawamura

Yoshifumi Nishimura

Akira Nagamine

Hiroshi Sasabe

Koji Kato

Kazuhiko Saito

Masaki Saito

A rubber-cord complex having an improved wet heat adhesive property between a rubber and a cord comprising a drawn plated wire, and including a metal cord comprising a drawn plated wire prepared by providing a brass plated layer on the surface of an element wire and drawing the resulting plated wire, and a rubber vulcanized and bonded to the cord, wherein in a wet heat deterioration state of the drawn plated wire after being subjected to the vulcanization to bond the rubber thereto and further held under an atmosphere having a temperature of 50 to 100&#xb0; C. and a humidity of 60 to 100% for one hour to 20 days, the average grain size of crystal grains present in the brass plated layer is not more than 50 nm, and the grain boundary of the crystal grains has a fractal dimension of 1.001 to 1.500.

Metal cord, rubber-cord complex and pneumatic tire using the same

Rubber-cord complexhaving improved wet heat adhesive property between rubber and cord. The rubber-cord complex includes cordcomprising drawn plated wireprepared by providing brass plated layerE on surface of element wireand drawing the resulting plated wire and rubbervulcanized and bonded to cord. The rubber-cord complexhas adhesion reaction layer(formed by cross-linking sulfur and copper) between rubberand brass plated layerE. Adhesion reaction layerhas average thickness of 50-1,000 nm. Interface S between adhesion reaction layerand the rubber has a fractal dimension of 1.001-1.300 in a wet heat deterioration state after being subjected to vulcanization to bond rubberthereto and being held at a temperature of 50-100&#xb0; C. and a humidity of 60-100% for one hour to 20 days.

A method of manufacturing an annular concentric stranded bead cord, wherein, while rotating an annular core at a fixed position in a peripheral direction, a reel, upon which a lateral wire is wound, repeatedly performs a pendulum swinging movement and a perpendicular movement with respect to the annular core, thereby spirally winding the lateral wire upon the annular core to form a sheath layer. When forming the sheath layer, a fulcrum of the pendulum swinging movement of the reel is determined so that, with reference to a tangential line of a circle of the annular core passing through a winding point where the lateral wire is wound upon the annular core, the lateral wire is wound upon the winding point of the annular core within 15 degrees at a position above the tangential line and within a range of 55 degrees at a position below the tangential line.

Method and apparatus of manufacturing annular concentric stranded bead cord

An annular metal cord includes an annular core portion and an outer layer portion. The annular core portion is formed by connecting together both ends of a first strand material which is made up of six twisted first metal filaments. The outer layer portion is formed by winding spirally a second strand material which is made up of six twisted second metal filaments around the annular core portion. The second strand material is wound at a predetermined winding angle relative to a center axis of the annular core portion, and a winding initiating end portion and a winding terminating end portion are connected together. As a result, the breaking strength of the annular metal cord can be made large, and the production thereof can be facilitated.

Annular metal cord and endless metal belt

The disclosed bead cord which is lightweight and inexpensive and high in formability includes an annular core and a wrap wire helically wrapped around the annular core, the annular core being made of a medium carbon steel or an alloy steel having a lower carbon content and containing specific elements in suitable amounts. The diameter dof alular core satisfies 1.04&#x2266;d/d&#x2266;1.30 where dis the diameter of the wrap wire. The wrap wire has a coil diameter Dwhich is 0.5 to 1.3 times diameter Dof an annular shape of the annular core. The annular core may be formed with a plating layer of an Al&#x2014;Zn alloy or a thick plating layer of Zn, or the annular core may be made of stainless steel.

Annular concentric-lay bead cord

A rubber product-reinforcing metallic cord is provided which comprises three to five metallic filaments, which shows a high degree of penetration of rubber without reducing compressive rigidity, and which can be manufactured at low facility and production costs. A rubber product-reinforcing metallic cordis formed by twisting together a pre-strandcomprising a first metallic filamentand a second metallic filamenthelically wrapped around the first filament, and a fifth metallic filament(or) with a twist pitch P. The metallic cordmay be formed by twisting together two of such pre-strands, or by twisting together two of such pre-strands and the fifth metallic filament.

Rubber product-reinforcing metallic cord and method for manufacturing such a cord

The present invention relates to a composite cord for reinforcing rubber comprising an organic chemical fiber cord and a high-carbon steel fine wire used by being buried in the rubber, for reinforcing rubber products such as various kinds of tires and conveyor belts. The composite cord comprises an organic chemical fiber cord wrapped by brass plated high-carbon steel fine wire.

Composite cord for reinforcing rubber

A metal cord for reinforcing a rubber article is made by twisting three or more metal filaments. At least one or at most the total number minus two of the metal filaments have a larger shaping ratio in the diametrical direction of the cord than the other metal filaments. At least one of the metal filaments having a larger shaping ratio is kept out of contact at portions in the longitudinal direction with a metal filament or filaments arranged in juxtaposition at one side or both sides thereof. At least two adjacent ones of the metal filaments having a smaller shaping ratio are in contact with each other.

Metal cord for reinforcing rubber article

A metal cord is formed by twisting two spirally preshaped metal filaments together with a twisting pitch P. The metal filament has not only the spiral shape formed by twisting, but retains so much of its spiral preshape as to have a pitch p equal to 0.20-0.50 times the twisting pitch and a diametric height h of 0.05-0.25 mm. The retained spiral shape is in the same rotary direction as the direction in which the filaments are twisted together.

Metal cord and composite material comprising the metal cord and rubber

A steel cord for reinforcing rubber. It is made of three steel filaments all having different diameters from one another. The small-diameter and medium-diameter ones of the three filaments have internal stresses adapted to be released when the cord is cut at both ends thereof. Owing to these stresses, the diameter of the cord is adapted to increase after it is cut at both ends. At the same time, the medium-diameter and small-diameter filaments retract inwardly from the ends of the large-diameter and medium-diameter ones, respectively.

Steel cord for reinforcing rubber

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.

A high-elongation composite cord used for reinforcing a rubber composite such as a wheel tire and a conveyor belt. It is made by twisting a plurality of strands each made by twisting a plurality of brass-plated steel filaments and monofilaments of organic fiber. Before twisting the cord, monofilaments of organic fiber are put in the gaps formed between the adjacent strands so as to prevent fluidized rubber from penetrating into a center core formed in the cord after the cord has been covered with rubber. The monofilaments should have a diameter small enough not to protrude from a circle circumscribing the cord and large enough to close the gaps between the adjacent strands.

Steel composite cord

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.

Growing community of inventors

Itami, Japan

Kenichi Okamoto