Abstract
We report unsteady experimental results on the stability of fibre diameter in a continuous glass forming process, using two unique laser systems: a high resolution diffractometer and a backward phase Doppler interferometer. For draw ratios close to those used in the industry, the glass fibre diameter exhibits small fluctuations, which cannot be considered to be a result of draw resonance. It is shown that the amplitude of fibre diameter fluctuations decreases with increasing draw ratio, while the corresponding frequency increases with the temperature of the molten glass. Although the origin of these fluctuations is still not well understood, it appears that their frequency depends on the characteristics of the molten glass jet.
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