METHOD AND EQUIPMENT FOR SINTERING POROUS GLASS BASE MATERIAL

摘要

A method and equipment for sintering a porous glass base material which do not cause displacement of the core or elliptical deformation of the outer circumference of the base material. When it is dehydrated and turned into transparent glass by being sintered. The sintering method of a porous glass base material for sintering a rod-like porous glass base material by passing it through a heating furnace while being suspended, characterized in that the porous glass base material is lowered into the heating furnace where the temperature is raised to a sintering point, each part of the porous glass base material is passed through a preheating region from the upper end of the heat insulating material of the heating furnace body to the upper end of a heater over 4.5 hr or longer and then sintered by means of the heater to produce transparent glass.