Method for producing a full cylinder from quartz glass
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United States of America Patent
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N/A
Issued Date -
Sep 11, 2003
app pub date -
Dec 3, 2002
filing date -
Jun 9, 2000
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
In a known method for the manufacture of a solid quartz glass cylinder (18) by drawing from a hollow quartz glass cylinder (5) in a vertical drawing process, the hollow cylinder (5) is passed to a heating zone (4), softened therein in one area after the other and the solid cylinder (18) is drawn off from the softened area (15) with a reduced inside pressure (P.sub.1) being maintained in the inside bore (19) of the hollow cylinder (5) versus an outside pressure (P.sub.2) applied on the outside thereof. To be able to specify on this basis a method by means of which a solid quartz glass cylinder can be inexpensively drawn from a hollow cylinder by largely avoiding a radial deformation, it is proposed in accordance with the invention that the vertical drawing process comprises an initial drawing phase and a drawing phase, with the inside pressure (P.sub.1) being gradually reduced in the course of the initial drawing phase, by 10 mbar per minute or slower, down to a preset nominal value, and the inside bore being collapsed at the same time.
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