Preform, spetsdel av en preform, och förfarande för tillverkning av en fiber

摘要

A preform, a head part for a preform and a method for manufacturing a fiber. The head part is adapted to be attached to a preform of a fiber. The head part has such a shape that a heat load directed to the preform will be distributed to the cross section of the bulk part in a predetermined manner, like evenly distributing the heat load to the cross section of the preform. When manufacturing a fiber from a preform including such a head part the heating of the preform is more controllable thus resulting in a fiber with a better quality.