Patent ID: 6827884
Filing Date: 2004-12-07
Classification: G02B

Abstract:
A method for the production of a polymeric material tube associated with at least one optical fibre accommodated therein, which comprises the following steps:a) feeding said at least one optical fibre along a path to an extruder; b) extruding polymeric material around said optical fibre to form said tube; and (c) cooling the tube to a predetermined final temperature by the following steps comprising: d) applying a first traction force to the tube containing said optical fibre in a first section of an extrusion line; e) applying a second traction force to said tube in a second section of said extrusion line, with substantial lack of congruence between said fibre and said tube, said second traction force being greater than said first traction force; and (f) applying a third traction force to said tube in a third section of said extrusion line, said third traction force being less than said second traction force; wherein the tube temperature during the step in which said second traction force is applied undergoes a limited variation.