The drawing of biocompatible phosphate glass fibres is considered in this article. The fibres are drawn from a crucible through a nozzle, the fibre diameter, the hydrostatic pressure in the crucible and the force necessary to draw the fibres are determined as a function of the time and the drawing speed. Additionally, the jet angle at the drop formed at the nozzle is studied. The hydrostatic pressure and mass flow decreases with increasing time. The fibre diameter decreases with increasing time and drawing speed. An increase in the drawing stress is observed along with increasing drawing times, which is explained through the decrease in the hydrostatic pressure and the jet angle of the drop formed in the nozzle of the crucible. Correlations found facilitate to optimise the fibre drawing conditions with respect to fibre properties and quality control.
