Method and device for drawing a tubular strand of quartz glass
A quartz glass and pipeline technology, applied in the field of drawing quartz glass pipelines and devices, can solve the problems of uneven quartz glass lines, difficulty in remelting and the like
Inactive Publication Date: 2008-12-17
HERAEUS QUARZGLAS
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Problems solved by technology
This leads to inhomogeneities in the drawn quartz glass wire, and because of the relatively high viscosity of the quartz glass body, it is more difficult to remelt the part without problems
Method used
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[0061] The drawing furnace shown in Figure 1 comprises a crucible 1 made of tungsten, SiO 2 Granules 3 are continuously fed into the crucible 1 from above via a feed nozzle 2 .
[0062] The crucible 1 is surrounded by a water-cooled (12) furnace jacket 6 and forms an inert gas chamber 10 filled with an inert gas, the inert gas chamber 10 is equipped with a porous insulating layer 8 of oxidic insulating material and an electric resistance for heating the crucible 1 Heater 13. The shielding gas chamber 10 is opened downward, and is otherwise sealed from the outside with a bottom plate 15 and a cover plate 16 . The crucible 1 encloses a crucible interior 17 which is also sealed from the environment by means of a cover 18 and a sealing element 19 .
[0063] A drawing nozzle 4 made of tungsten is arranged in the bottom region of the crucible 1 . This nozzle consists of an annular outer part 7 of the drawing nozzle, which is used in the bottom of the crucible 1, and an inner part...
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Abstract
In a known method for drawing a tubular quartz glass strand, a crucible is fed with SiO2-containing start material, the start material is softened in the crucible and, as a softened quartz glass mass, is drawn vertically downwards as a tubular quartz glass strand along a drawing axis through an annular gap between an outer member and an inner member, which is arranged in a through hole of the outer member, of a drawing nozzle provided in the bottom area of the crucible. To improve the known method with respect to less inhomogeneity in the drawn-off tubular strand and thereby to permit the manufacture of homogeneous, defect-free hollow cylinders of quartz glass by drawing from the melt, it is suggested according to the invention that the inner member of the drawing nozzle, viewed in the direction of the drawing axis, is held suspended and radially movable inside the through hole of the outer member, and that the annular gap of the drawing nozzle has a longitudinal section 'L' in which its cross-sectional nozzle area is reduced in size from the top to the bottom.
Description
technical field [0001] The invention relates to a method for drawing quartz glass tubing, wherein a crucible is supplied with SiO-containing 2 The starting material is softened in the crucible and drawn as a softened quartz glass body vertically down the drawing axis through the annular gap between the outer part and the inner part of the drawing nozzle. A quartz glass line is drawn, the inner part is arranged in the through-hole of the outer part, and the drawing nozzle is arranged in the bottom region of the crucible. [0002] Furthermore, the present invention relates to an apparatus for drawing quartz glass tubing, comprising: a crucible for receiving 2 The starting material of the crucible is surrounded by a heater for softening the starting material; and a drawing nozzle is arranged in the bottom region of the crucible, and the drawing nozzle includes an outer part and an inner part, the The inner part is arranged in the through hole of the outer part, leaving an annul...
Claims
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IPC IPC(8): C03B17/04
CPCC03B5/0336C03B17/04
Inventor R·霍恩H·勒伯M·特罗默N·惠佩R·伯格J·贝克R·格哈特
Owner HERAEUS QUARZGLAS