Steel wire for reinforcing rubber

Abstract

The rubber reinforcement steel wire of the invention respectively turns n singles (n is equal to 3 to 6) into spiral shape and a monolayer is twisted by the means of forming a gap among the singles to obtain the open twisting structure of 1 multiplied by n. The spiral shape of each single is flat. And the section of a cable line approximates ellipse. The single is arranged to be inegalitarian arrangement as defined, the major axis of the cable line of the single has different spiral width in defined shape, or the ratio of the spiral angle (Alpha) of the major axis and the spiral angle (Beta) of a minor axis is set within prescribed limit. Therefore, extension in the direction of cable line in an under load area, which results from stretching, can be inhibited, with the result that the invasive property of the rubber can be well kept.

Description

technical field [0001] The present invention relates to steel wires for rubber reinforcement used as embedding reinforcements for rubber products such as tires and conveyor belts, and more particularly to steel wires for rubber reinforcement with a single-layer structure, open twisting, flat helical shape of monofilaments, and elliptical cross-section Steel wire (elliptical open cable). Background technique [0002] As steel wires for rubber reinforcement embedded in rubber products such as tires and conveyor belts, for example, so-called 1×n (n=3 to 6) steel wires in which 3 to 6 monofilaments (steel wires) are twisted into a single layer structure have been used. . The single-layer steel wire has a straw-shaped gap in its center in the length direction of the wire. Especially in the case of closed twisting in which the monofilaments are closely attached to each other by densely twisting, the center portion of the wire gap closed. At this time, for example, when the stee...

AI Technical Summary

Problems solved by technology

[0005] In contrast, as shown in JP-A No. 2-91291 and JP-A-10-266083, steel wires of the following structures have also been used as measures to ensure the rubber permeability of single-layer steel wires. It is known that the cross-section of the wire is approximately elliptical, and that parts where the monofilaments do not contact each other at all and parts where at least two monofilaments contact each other are alternately arranged in the length direction of the wire, but in this case, although The shape stability of the wire becomes good, but the part that is tightly twisted is too much and sufficient rubber impregnation cannot be obtained

[0006] In addition, the steel wire for rubber reinforcement (elliptical open cable) with a single-layer structure of open twisting, in which the helical shape of the monofilament is flat and the cable cross-section is approximately elliptical, due to the contact on the short diameter part of the monofilament It acts as a constraint to suppress the stretching and deformation of the cable, and it is easy to maintain the gap on the long diameter part, so the rubber immersion property is better than that of the cable with a circular cross section. In the calendering process of the incoming wire, even under the action of tension when the wire is pulled out from the reel installed on the reel holder, the gap between the monofilaments is still reduced, resulting in a state where the rubber cannot be immersed.

Images