Method for producing tubes of quartz glass

A technology of quartz glass tube and quartz glass, which is applied in glass forming, glass reshaping, glass production, etc. It can solve the problems of damage to the inner wall of the tube, complexity, and complexity of sealing plugs, and achieve a simple method and reduce material Loss, to achieve the effect of following the movement

Inactive Publication Date: 2007-09-19
HERAEUS QUARZGLAS
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Problems solved by technology

[0009] This method is also complex, the introduction of the sealing plug and the removal of the retaining tube from the separate pipe piece proves to be complicated and may damage the inner wall of the tube to be produced

Method used

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  • Method for producing tubes of quartz glass

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Embodiment Construction

[0036] The drawing plant according to FIG. 1 comprises a vertically arranged furnace which can be heated to temperatures above 2300° C. and which comprises an annular resistance heating element 1 , a gas supply system and a pulling device 22 .

[0037] During the drawing process, a hollow cylinder 2 of synthetic quartz glass (shown shaded) with a vertically oriented longitudinal axis 3 is continuously supplied to the heating element 1 from above and heated in a zone-wise manner between them, and is drawn from the The softened area of ​​the brewing 26 draws the tubing.

[0038]The hollow cylinder 2 and the tube wire 21 have a joint bore 4 . The hole is open downwards and closed upwards by a plug 5 . A purge gas line 6 protrudes through the plug 5 into the bore 4 , the purge gas being supplied from a process vessel 7 with a gas mixture consisting of oxygen and nitrogen. The process container 7 is connected to a mixing container 10 via a mixed gas line 8 which can be closed by ...

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Abstract

In a known method for producing tubes of quartz glass, a hollow cylinder (2) of quartz glass is continuously supplied to a heating zone (1) and is softened therein in regions, and a tube strand (21) is drawn off at a drawing speed from the softened region with formation of a drawing bulb (26), and the tubes to be produced are cut to length in the form of tube strand pieces by separating the tube strand (21) at a desired separation point (T,Vu, Vo) and an internal pressure differing from the external pressure applied to the outer cladding is maintained in the inner bore (4) of the hollow cylinder (2) in that the inner bore (4) of the tube strand is provided with a flow obstacle. Starting therefrom to indicate a simple method which permits the manufacture of particularly largevolume quartz glass tubes with utmost precision, while observing narrow tolerances, it is suggested according to the invention that the flow obstacle should be configured as a constriction (28, 29) of the inner bore which is produced by softening and plastic deformation of the tube strand in the area of a deformation zone (Vu, Vo).

Description

technical field [0001] The invention relates to a method for the production of quartz glass tubes, in which a hollow quartz glass cylinder is continuously supplied to a heating zone and is softened zone-wise therein, and from the softening with a drawing bulb formed The zone draws the tubing at a certain drawing rate and cuts the tube to be produced to length in the form of tubing pieces by separating the tubing at the desired separation point, wherein the inner bore of the tubing is provided with flow obstacles, so An internal pressure different from the external pressure applied to the outer cladding is maintained within the inner bore of the hollow cylinder. Background technique [0002] Quartz glass tubes are used in the chemical industry, in the manufacture of semiconductors, in the field of optics in the form of semi-finished or finished products and in particular for the manufacture of preforms for optical fibers. [0003] DE 195 36 960 A1 describes a method for prod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03B23/047
CPCC03B23/0473C03B23/047Y02P40/57
Inventor N·西比斯O·冈茨
Owner HERAEUS QUARZGLAS
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