To provide a method for manufacturing a glass rod, by which stains can be easily removed in cleaning and drying processes of a glass preform, which are performed before drawing, and the glass rod having a clear surface can be manufactured by drawing of the preform.
When the glass rod having a diameter smaller than that of the glass preform is manufactured by drawing the glass preform, the glass rod is obtained by drawing the preform while heating and softening it after cleaning the surface of the glass preform with steam. It is preferable that the temperature and the pressure of the steam used for cleaning are within ranges of 120-160°C and 0.27-0.62 MPa, respectively. Preferably, the glass preform is made into a true round shape before drawing by grinding its surface with loose abrasive grains or a fixed abrasive grains, and further the preform is subjected to chemical washing using an alkali or an acid.
| JPH07109136A | 1995-04-25 | |||
| JPS58217442A | 1983-12-17 | |||
| JPS573723A | 1982-01-09 | |||
| JP2002509852A | 2002-04-02 |
Naotaka Kono
Eiichiro Shimazaki