| 摘要 |
PURPOSE:To simplify the process for the preparation of light-transmitting glass fiber in the spinning with a multiple crucible system composed of two crucibles, and to facilitate the preparation of the fiber, by feeding viscous glass raw material to the melting crucible with pressure. CONSTITUTION:A highly viscous oxide paste 20 is charged as a raw material of core glass in a vessel, and mixed with a small amount of pure water to adjust the viscosity to the desired level. The raw material 20 is introduced into the crucible 11 for melting core glass with compressed O2 gas. On the other hand, the raw material of clad glass is introduced into the clad glass melting crucible 13 in the similar manner. The crucibles are heated during the introduction at the desired temperatures with the ovens 18A and 18B. The molten glass 12, 13 are agitated by dried gas introduced through a pipe 15, and water is removed therefrom in the form of bubbles. After the treatment, the stopper at the end B of the spinning crucible 17 is removed, and the extruded glass fiber is wound and spun. |
