| 摘要 |
PURPOSE:To uniformize the actions of a dehydration agent and a reduction suppressing agent in the longitudinal direction of a porous deposit of glass soot and uniformize the characteristics of an optical fiber produced from the soot in longitudinal direction by uniformizing the concentration distributions of the atmospheric gas, the dehydration agent, the reduction suppressing agent, etc., in a muffle. CONSTITUTION:A gas-introducing pipe 2 for introducing an atmospheric gas, a dehydration agent, a reduction suppressing agent, etc., into a muffle 1 is connected to the bottom of the muffle 1. A baffle plate 3 is placed in the muffle 1 at a part near the opening of the gas-introducing pipe 2. In the dehydration process of a porous deposit 5 of glass soot inserted into the muffle 1, a gaseous mixture of the atmospheric gas, the dehydration agent, the reduction suppressing agent, etc., is introduced into the muffle 1 from outer sources, blown through the opening of the gas-introducing pipe 2 into the muffle 1, retained near the opening by colliding with the baffle plate 3 placed near the opening of the pipe and then filled in the muffle 1. |
