PRODUCTION OF FINE GLASS PARTICLE-DEPOSITED BODY

摘要

PURPOSE:To stably obtain the fine glass particle-deposited body and to prevent the adhesion of glass particles to the inside walls of the burners at the time of producing the fine glass particle-deposited body by a soot synthesis method by improving the structure of multiple flame burners thereby lessening the decrease of a synthesizing speed than in the conventional method. CONSTITUTION:The fine glass particle-deposited body is synthesized by using the so-called multiple flame burners having the following structure: The combustion burners for synthesizing fine glass particles which are disposed concentrically in the form of multiple pipes have the structure which has outer flame ports formed of a fuel ejection port 4 and a combustion supporting gas ejection port 5 on the outer side of the fine glass particle synthesizing flame port having at least a glass raw material ejection port 1, a fuel ejection port 2 and a combustion supporting gas ejection port 3 and in which the above-mentioned outer flame port projects from the fine glass particle synthesizing flame port. The following improvement is further added to this structure: The production is executed while the pipe 6 molding the boundary of the outer flame port and the fine glass particle synthesizing flame port or the inside wall of the pipe 6 is heated (e.g.; by a built-in heater 7) to at least >=100 deg.C.