Patent ID: 6500365
Filing Date: 2002-12-31
Classification: B29C,B29D,G02B

Abstract:
Process for the manufacture of an optical core for a telecommunications cable, comprising at least one central support with a first polymeric coating layer, a plurality of optical fibres arranged longitudinally around the support and a second polymeric coating layer extruded around said first polymeric layer and around said optical fibres, which comprises the steps of:a) arranging said optical fibres longitudinally around said first polymeric coating layer so that the optical fibres are substantially tangential to the surface of said coating and circumferentially separated from each other in a predetermined way; b) extruding the second polymeric layer around said first layer and around said optical fibres, maintaining a condition of substantial tangency and circumferential separation at least as far as the exit of the extruder, wherein the temperature of the first polymeric layer is kept at least 30Â° C. below the melting temperature of the polymer before extruding the second polymeric layer on it, and said second layer is extruded at a temperature sufficiently high such that the polymer material of said second layer has a viscosity lower than a predetermined value, so to avoid the fibres from being displaced from their relative positions, both in the axial direction and along the circumference.