JPS57188424A - Manufacture of base material for glass fiber - Google Patents

Abstract

PURPOSE:To manufacture the titled base material with high productivity by feeding fixed amounts of liq. compounds as starting materials for glass to an evaporator connected to the rear end of a multiply tubed burner, vaporizing the compounds, and immediately introducing the vaporized compounds into the burner to form fine glass powder at an increased rate. CONSTITUTION:Each of compounds 6 as starting materials for glass such as SiCl4, BBr3 and POCl3 is stored in a container 7 kept at the m.p. or above, and fixed amounts of the compounds 6 are fed into the inner tube 12a of an evaporator 12 with constant volume pumps 9 through a check valve 11. The compounds 6 dropped from the narrowed tip of the tube 12a are vaporized by absorption of heat from surroundings, and the vaporized compounds are introduced into the innermost layer tube of a multiply tubed burner 13 through a pipe 12d feeding starting materials for glass with gaseous Ar or the like introduced from a pipe 12c for introducing a carrier gas. Gaseous H2 is fed to the 2nd layer tube of the burner 13, and gaseous O2 to the outermost layer tube. By igniting the burner 13, the compounds 6 are subjected to a vapor phase chemical reaction to form fine glass powder. This powder is deposited on the tip or the outside of a rodlike substrate to manufacture a base material for a glass fiber.