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Method and device for drawing a quartz glass cylinder from a melt crucible

A technology of quartz glass and melting crucible, which is applied in glass forming, glass forming, glass production, etc. It can solve the problems of sensitive temperature fluctuation, complicated design and operation, etc., and achieve the reduction of melting energy, improvement of homogeneity, and reduction of Effect of temperature load

Active Publication Date: 2012-05-23
SHIN ETABU QUARTZ PRODS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The devices used in the known drawing method are relatively complex in their design and operation, while the method proves to be relatively sensitive to temperature fluctuations in the crucible inner cavity

Method used

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  • Method and device for drawing a quartz glass cylinder from a melt crucible
  • Method and device for drawing a quartz glass cylinder from a melt crucible
  • Method and device for drawing a quartz glass cylinder from a melt crucible

Examples

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Effect test

example 1

[0050] SiO 2 The particles 3 are conveyed continuously via the supply pipe 2 into the melting crucible 1 and heated therein to a temperature of approximately 2100° C. to 2200° C. Here, in the region of the lower part of the melting crucible 1, a softer quartz glass frit 9 is formed, on which the SiO 2 Particle layer composed of particles 3. from SiO 2 The particles 3 form two approximately equally sized main mass flows 20a, 20b with softened quartz frit 9 in the direction of the two drawing dies 4a, 4b. These main mass flows 20a, 20b are in figure 1 are shown by hatching and square arrows.

[0051] Since the quartz glass frit 9 is exposed to an average higher temperature in the region of the melting crucible 1 near the edges than in the middle region, it is therefore more effective in the two main mass flows near the edges than at a given melting crucible temperature. The situation in the middle area is better homogenized. The magazine flow through the melting crucible r...

example 2

[0053] Alternatively to this, SiO 2 The particles 3 are heated in the melting crucible 1 to a temperature of approximately 2050° C. to 2150° C., ie approximately 50° C. lower than in Example 1 .

[0054] Here, from SiO 2 The granule 3 is also formed in the direction of the two drawing dies 4 a , 4 b with two approximately equally sized peripheral main mass flows 20 a , 20 b of the quartz frit 9 .

[0055] Here, the quartz glass frit 9 in the main mass flows 20a, 20b is exposed to a temperature load approximately as in a "silo flow" in a conventional drawing method, and the solid cylindrical bundles 11a, 11b thus obtained thus have Approximately the same homogeneity as the intermediate bundle produced in conventional drawing methods. However, since the temperature load on the crucible wall 1 and the crucible bottom 7 is lower, less penetration of the crucible from wear (Abrieb) and other impurities into the softened quartz frit and a longer service life of the melting crucibl...

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Abstract

The invention relates to a known method for drawing a quartz glass cylinder from a melt crucible comprising an inner crucible chamber extending in the direction of a center crucible axis and bounded by a side wall and a floor, wherein SiO2 granulate is fed into the melt crucible and therein softened into a quartz glass mass, and said mass is drawn vertically downward as a cylindrical quartz glass strand by means of a first draw-off device through a first draw nozzle provided in the floor of the melt crucible, and the quartz glass cylinder is cut off therefrom. In order to disclose a method starting herefrom and allowing the production of homogenous quartz glass cylinder at simultaneously high levels of productivity, the invention proposes that at least one second quartz glass strand is drawn off through at least one further second draw nozzle provided in the floor of the melt crucible, wherein the first draw nozzle and the second draw nozzle are disposed eccentrically to the center crucible axis and at a distance from each other.

Description

technical field [0001] The invention relates to a method for drawing a quartz glass cylinder from a melting crucible (Schmelztiegel), the melting crucible comprising a crucible inner cavity, which extends in the direction of the crucible central axis and is delimited by side walls and a bottom, wherein SiO 2 The particles are supplied to the melting crucible, where they are softened into a viscous quartz frit and which are drawn vertically downwards as cylindrical quartz by means of a first drawing device through a first drawing die arranged in the bottom of the melting crucible. A glass strand (quarzglassrang) and a cylinder of quartz glass is cut from it. [0002] Furthermore, the invention relates to a device for drawing a quartz glass cylinder with: for containing SiO 2 Particle melting crucible comprising a crucible cavity extending in the direction of the crucible central axis and delimited by side walls and a bottom; for softening SiO 2 heating means for the particles...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03B17/04
CPCC03B17/04Y02P40/57
Inventor H·勒贝尔R·贝格N·怀佩
Owner SHIN ETABU QUARTZ PRODS
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