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A method for the preparation of a hollow cylinder consists of a synthetic quartz glass, according to the method of thick-walled hollow cylinder and a process for the preparation of a preform for optical fibers
A method for the preparation of a hollow cylinder consists of a synthetic quartz glass, according to the method of thick-walled hollow cylinder and a process for the preparation of a preform for optical fibers
A method for the preparation of a hollow cylinder (1) is made of synthetic quartz glass comprising the steps of:(a) providing an inner tube (3 '') is made of synthetic quartz glass, the one of an inner wall has limited internal bore (2),(b) coating of the inner tube (3 '') with an sio2-Soot layer (4''),(c) sintering of the sio2-Soot layer with the formation of the hollow cylinder,characterized in that measures are provided, which a limitation of the surface temperature on the inner wall of the inner tube (3 '') to less than 1400°C. and the deformation of the inner tube - inner wall during the sintering is to counteract in such a way that the maximum values of the diameter of the internal boreholes of the inner pipe (3'') and quartz glass - hollow cylinder (1) in order to not more than + / differ – 5% (based on the original inner diameter of the inner tube (3'')).
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