METHOD AND DEVICE FOR MANUFACTURING A SHEATH SOLD IN INSULATING MATERIAL AROUND A CONDUCTOR, AND COAXIAL CABLE EQUIPPED WITH SUCH A SHEATH

摘要

The present invention relates to a method for manufacturing an aerated sheath (5) made of an insulating material around a conductor (4), this sheath comprising a longitudinal passage (51) in which the conductor (4) is housed. as well as closed cells (52) extending longitudinally and separated from each other by radial walls (53), the method comprising the following operations: BR/ - the insulating material (35) is extruded in the state viscous by giving it the desired shape by means of forming means (2, 3) to form the cells (52), BR/ - the insulating material thus formed is applied to the conductor, BR/ the insulating material is cooled to obtain the sheath, characterized in that the insulating material is applied to the conductor at a distance from the outlet of the shaping means such that the material is sufficiently stretched so that the walls (53, 54) of the cells (52) do not collapse, without the use of an overpressure inside the cells. / P