| 摘要 |
PURPOSE:To enhance adhesion of soot to generate no drift to initial base material in sintering by heating the initial base material immediately before accumulating glass soot in production of base material of optical fiber with accumulating glass soot on the initial base material in outside covering method. CONSTITUTION:Powder of SiO2 is adhered to initial base material rotating in the direction of arrow 12 by ejecting glass raw material such as SiCl4 together from three oxyhydrogen burners 21, 22 and 23 and reacting, and simultaneously the oxyhydrogen burners 21-23 are traversed to left and right to accumulate glass soot. In said case, raw material gas is not fed to the first oxyhydrogen burner 21 used to heat the initial base material 10. Deposition on the initial base material immediately after heated by the first burner 21 is performed by the second oxyhydrogen burner 22 and further deposition on the resultant surface is performed by the third burner 23. |
