| 摘要 |
PURPOSE:To provide a method for forming a porous glass body in which the yield of non-defectives can be enhanced by a precise and simple forming means and operating efficiency can also be enhanced. CONSTITUTION:A cylinder 11 having an extrusion port 12, a plunger 21 having a through-hole 22 and an operation rod 31 to be inserted into the through-hole 22 are used to place a forming material 51 in the cylinder 11. A glass rod 41 is set in the through-hole 22 of the plunger 21 to form a porous glass body 52 on the outer periphery of the glass rod 41. Thereby, the objective porous glass body of high quality without any cracking, breakage, bending, slippage in positions of the glass rod and the porous glass body, etc., and further residual bubbles after transparent vitrification can be produced in good yield. Reduction in equipment cost, rationalization of operation and facilitation of maintenance can be carried out at the same time. |
