Surface cable patterns for tyre reinforcement fabrics - for enhanced matrix anchorage to metallic fabrics
Reinforcement fabrics for tyre carcasses comprise obliquely oriented metallic cables, and laid with the edge folded inwards or outwards depending upon whether the twists or bands (S or Z) are identical or different on the outer faces, where the cables, of the outermost layers of the fabrics are twisted from cords each incorporating >=2 elementary filaments wound in the same hand as the cords and where the cords are wound with a shorter pitch than the pitch of the constituent elementary filaments. Used for reinforcement fabrics made of either elastic cables or coreless cables or cored cables. Matching the direction of twist of the components of the surface cables increases the flexural fatigue resistance of a composite structure of the fabrics in a rubber matrix, because the gum can penetrate teh core structure relatively readily prior to curing.