METHOD OF PREPARING OPTICAL INORGANIC FIBERS Russian patent published in 1996 - IPC

FIELD: fiber optics. SUBSTANCE: optical inorganic fibers are prepared by melting glasses with different refraction coefficients in melting chambers of a vessel, transferring melts into producing chambers and shaping fibers. Path that glass melt follows from melting chamber to producing zone twice inverts its direction. One of these directions is contrary to gravitation one. In its top point glass melt comes in contact with atmosphere, transition layer thickness not exceeding 10 mm. Temperature of glass melt in zone where direction of its movement is contrary to gravitation direction provides melt viscosity equal to 1.5-35 Pa. EFFECT: enhanced efficiency of process. 2 dwg