초록 ▼

In a known process for the production of quartz glass bodies, SiO.sub.2 particles are deposited of the mantle surface of a cylindrical carrier rotating about its longitudinal axis, forming an elongated, porous preform, where the SiO.sub.2 particles are formed in a plurality of flame hydrolysis burne

In a known process for the production of quartz glass bodies, SiO.sub.2 particles are deposited of the mantle surface of a cylindrical carrier rotating about its longitudinal axis, forming an elongated, porous preform, where the SiO.sub.2 particles are formed in a plurality of flame hydrolysis burners which are arranged in at least one burner row parallel to the longitudinal axis of the carrier and are moved at a preset translational speed forward and back between turnaround points at which points their direction of movement is reversed, and in which process the preform is sintered. In order to make available on this basis an easily accomplished process that makes it possible to manufacture a preform which is largely free of localized density variations, the invention proposes on the one hand that the base value of the surface temperature of the preform being formed be kept in a range between 1,050.degree. C. and 1,350.degree. C., that the average peripheral velocity of the preform be kept in the range between 8 m/min and 15 m/min and the average translational velocity of the burner row be kept in a range between 300 mm/min and 800 mm/min. On the other hand, the object is also accomplished according to the invention and on the basis of the known process in that in the area of the turnaround points (A, B) the peripheral velocity of the preform being formed is increased and/or the flame temperature is lowered and/or the distance of the burners from the preform surface is changed.

대표청구항 ▼

[ We claim:] [1.] A process for the production of quartz glass bodies by deposition of SiO.sub.2 particles on the mantle surface of a cylindrical carrier rotating about its longitudinal axis and forming an elongated porous preform, said process comprising:forming the SiO.sub.2 particles in a plurali

[ We claim:] [1.] A process for the production of quartz glass bodies by deposition of SiO.sub.2 particles on the mantle surface of a cylindrical carrier rotating about its longitudinal axis and forming an elongated porous preform, said process comprising:forming the SiO.sub.2 particles in a plurality of hydrolysis burners which are arranged in at least one burner row disposed parallel to the longitudinal axis of the carrier;providing for relative reciprocating movement of the burner row relative to the preform parallel to the longitudinal axis of the carrier so that each burner reciprocates between respective turnaround points located between longitudinal ends of the preform at which turnaround points the direction of reciprocating movement is reversed, where the burners move at preset transitional speed forward and back between respective transitional areas adjacent the turnaround points in which transitional areas the burners move slower that said preset transitional speed; andsintering of the preform thus produced;wherein, when the burners are in the transitional area adjacent the turnaround points, the peripheral velocity of the forming preform is increased, the flame temperature of the hydrolysis burners is lowered, or the distance of the hydrolysis burners from the preform surface is changed.