Process for the continuous formation, without any internal support, of a hollow cylindrical body in the soot, which serves as a preform for the manufacture of optical fibers.

摘要

The body in suie8 is essentially composed of silicon dioxide. It is the form of a stand, by means of at least one burner of hydrolyse1 for the production of soot. The start of the formation, the soot is filed on a body auxiliaire2, which is rotated relative to the bruleur1 during the formation. The orifice of the burner of formation1 is held approximately to the medium to the - the top of the cross section of the free - predetermined end which increases towards the top of the wall cylindrique8 -. It is stop the penetration of soot in the cavity axiale9 of the cylinder by means of a gas current directed, in particular by a burner auxiliaire10.