Importance

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Abstract

A straight steel monofilament (10, 42) for the reinforcement of belt ply (40) of a pneumatic tyre wherein the straightness is determined by the arc-height of the straight steel monofilament (10, 42). The steel monofilament (10, 42) is plastically deformed by a twisting action along the axis of the steel monofilament (10) on a double-twist apparatus (2). The plastic twist deformation eliminates the surface stress difference on the steel monofilament (10, 42) and provides a straight steel monofilament (10, 42) having an arc-height of less than 30 mm By these means a simple solution is provided to manufacture a straight steel monofilament (10, 42) suitable for tire reinforcement with high speed for mass production by using a known apparatus (2).

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First Claim