Sumitomo (sei) Steel Wire Corp.

Sumitomo Rubber Industries Limited

Nippon Steel Sumitomo Metal Corporation

Sumitomo Electric Tochigi Co., Ltd.

Sumitomo Electric Industries, Limited

Yuichi Sano

Kenichi Okamoto

Shinichi Miyazaki

Keisuke Aramaki

Junichi Kodama

Yasuo Sakai

Hitoshi Wakahara

Osamu Toda

Koji Kato

Hiroshi Sasabe

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

A method for making a metallic cord made up of one or more metallic wires comprises: making at least two layers of at least two metallic elements including copper and zinc on the surface of a base wire; heating the layers to cause the metallic elements thermodiffusion to transform into a primary alloy layer; making a layer of copper on the primary alloy layer; drawing the wire provided with the primary alloy layer and outer copper layer into a metallic wire through dies so that the outer copper layer is diminished during passing through the dies, and a secondary alloy layer is formed as a result of transformation of the primary alloy layer and the outer copper layer which is caused by frictional heat during passing through the dies.

Method for making metallic cord

Growing community of inventors

Utsunomiya, Japan

Yuichi Sano