| 摘要 |
PROBLEM TO BE SOLVED: To provide a new method for producing a glass pipe wherein the lowering of ultraviolet light permeability is suppressed while keeping high production efficiency, in the drawing work of a glass pipe. SOLUTION: The glass pipe 2 having a desired outside diameter, inside diameter and thickness is formed by heating, softening and lengthening the glass pipe 1 while holding pressure at the inside 3 of the glass pipe 1, 2 to be higher than that at the outside 4 of the glass pipe 1, 2. Chemically inert gas 7 at the temperature of heating and softening the glass pipe 1, 2 is a main component of an atmosphere in at least one of the inside 3 and the outside 4 of the glass pipe 1, 2. COPYRIGHT: (C)2010,JPO&INPIT
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