Patent ID: 11940648
Assignee: HERAEUS QUARZGLAS GMBH & CO. KG
Field: Other special machines (Mechanical engineering)
Classification: CPC C  G | IPC C  G

Claim 3:
4. Method according to claim 1, characterized in that, during elongation, the primary preform is continuously supplied to a heating zone at a feed rate, softened zone by zone in the heating zone, and removed from the heating zone at a removal rate, wherein the feed rate is set so as to result in a throughput of at least 0.8 g/m in, preferably a throughput in the range from 0.8 g/min to 85 g/min, and particularly preferably a throughput in the range of 3.3 g/min to 85 g/min, and an average dwell time in the heating zone of less than 25 min, preferably an average dwell time in the range of 5 to 25 min.