Method for the manufacture of a preform

Details Method for the manufacture of a preform Method for the manufacture of a preform

C - Chemistry, Metallurgy

03

B

C03B 23/047 (2006.01) C03B 37/012 (2006.01)

Patent

CA 2088495

2088495 9221625 PCTABS00017 In order to improve a process for manufacturing rod-like preforms (12), in particular for optical fibres, according to which a tubular base body (1) having in the radial direction a varying index of refraction is introduced in a heating zone (4), is softened therein and is formed into a preform (12) in the softened state, a process is disclosed for manufacturing high purity, defect-free preforms (12). For that purpose, a base body is used whose index of refraction, seen in the radial direction, decreases inwardly from at least one interface sufficiently spaced from the outer surface of the base body (1), the zone softened in the heating zone (4) is turned inwardly up to an outer skin (2), and the preform (12) is formed in the longitudinal axis of the tubular base body, in the opposite direction to its direction of transport into the heating zone (4). The remaining outer skin (2) is drawn in the shape of a rod (11) in the direction of transport of the base body.

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