METHOD FOR PRODUCING QUARTZ GLASS FIBER, QUARTZ GLASS STRAND, QUARTZ GLASS YARN AND QUARTZ GLASS CLOTH

摘要

PROBLEM TO BE SOLVED: To provide a method for producing a quartz glass fiber capable of stably producing an extra-fine quartz glass fiber having a diameter of 7μm or less. SOLUTION: The method for producing a quartz glass fiber comprises heating and drawing a quartz glass material which is a quartz glass rod or a quartz glass fiber having a diameter (mm) D of 0.10-1.40 mm by a burner flame from a direction substantially orthogonal to the travel direction of the material to produce an extra-fine quartz glass fiber having a diameter (mm) of d. The linear velocity of the burner flame is set at 80 m/s or less. The draw-down ratio (D/d) is 14-200. The width of a burner nozzle used in the travel direction of the quartz glass material is at most 3.0 mm. These conditions allows the leading end of a conical fusion zone, in which the diameter changes from the quartz glass material to the extra-fine quartz fiber, to shift to the outside of the burner flame. As a result, an extra-fine quartz glass fiber having a diameter of 7μm or less can be produced with a range of fluctuation of the diameter of within±5%. COPYRIGHT: (C)2007,JPO&INPIT