Patent ID: 6047564
Filing Date: 2000-04-11
Classification: C03B

Abstract:
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.