Patent ID: 8869851
Filing Date: 2014-10-28
Classification: D07B,Y10S

Abstract:
1. A metal cord comprised of two layers of 3+N construction, rubberized in situ, having an inner layer formed from three core wires of diameter d 1 wound together in a helix with a pitch p 1 and defining a central channel, and an outer layer of N wires, N varying from 6 to 12, of diameter d 2 , which are wound together in a helix with a pitch p 2 around the inner layer, said outer layer of N wires forming gaps lying between the three core wires of the inner layer and the N wires of the outer layer; a diene rubber composition called a “filling rubber” collectively sheathing the three core wires of the inner layer, and wherein for any length of cord of at least 2 cm, the filling rubber is present in the central channel formed by the three core wires of the inner layer and in each of the gaps lying between the three core wires of the inner layer and the N wires of the outer layer; and the content of filling rubber in the cord is between 5 and 35 mg per g of cord, wherein said cord has the following characteristics (d wherein a periphery of the cord is substantially free of the filling rubber, wherein the filling rubber is uniformly distributed inside and around the inner layer by twist balancing, whereby residual torque of at least the inner layer is cancelled by the twist balancing.