| 摘要 |
PURPOSE:The title device designed to manufacture high-quality optical fibers of uniform dimension, wherein the glass is remolten in a U-shaped conduit between the melting and the spinning crucibles for a given time to prevent the devitrification of glass and to maintain the pressure applied to the nozzle constant. CONSTITUTION:The preform rods 1 and 2 are molten in the melting crucibles 3 and 4 by the heating furnace 7, kept by the U-shaped conduits 5 and 6 at a high temperature for a given time, and spun through the crucible 8 into fibers. The furnace 7 is kept at a higher temperature then that of the heating furnace 9 to prevent devitrification during the spinning. The contamination of impurities can be prevented by the almost airtight structure between the crucibles 3 and 4 and the double crucible 8. The heating time is controlled by the inside diameters of the conduits 5 and 6 and the crucibles 3 and 4, and the head H. The molten glass surface is controlled to maintain the pressure applied to the nozzle almost constant. |
