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Method and device for producing glass article from glass melt

A glass melt and glass product technology, applied in glass manufacturing equipment, glass production, glass furnace equipment, etc., can solve the problems of undesired changes in viscosity and density, inability to dissolve and stir, economic losses, etc.

Inactive Publication Date: 2016-02-10
SCHOTT AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0027] 2. With very high demands on the homogeneity of the glass melt, known methods and devices can no longer dissolve and stir (homogenize) these more viscous glass melt components
[0028] 3. The uppermost rotating stirrer blade located below the glass surface causes eddy currents which cause an overflow movement of the glass melt on the inner wall of the stirring device; into the glass melt
These lead to undesired changes in the composition of the glass melt in the stirrer vessel, changes in viscosity and density, inhomogeneities which can no longer be eliminated or can only be eliminated with considerable effort in subsequent processing steps , and ultimately lead to defects in the glass product to be produced (such as excessively disruptive streaks and bubbles), which in turn can lead to considerable economic losses, especially if the optical properties of the glass product are important

Method used

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  • Method and device for producing glass article from glass melt
  • Method and device for producing glass article from glass melt
  • Method and device for producing glass article from glass melt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0171] Methods 1 and 2 and devices 1 and 2 according to the invention are explained in more detail by using the following examples.

[0172] 1. Device 1 and Method 1:

[0173] Continuous pull-in of glass surfaces confirmed by physical simulations is achieved by,

[0174] -5 beater blades,

[0175] - all agitator blades with conveying action,

[0176] - the three upper stirrer blades are each arranged offset by 10° on the stirrer shaft and conveyed downwards,

[0177] - the downward conveying is assisted by the geometry of the stirrer blades,

[0178] - the lower two stirrer blades convey upwards, arranged offset by -10°,

[0179] - the upward conveying is assisted by the geometry of the stirrer blades,

[0180] - The stirrer blades on the stirring shaft are equally spaced between the upper three downwardly conveying stirrer blades,

[0181] - The stirrer blades on the stirring shaft are equally spaced between the lower two upwardly conveying stirrer blades,

[0182] - the...

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PUM

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Abstract

A method for producing a glass article from a glass melt is provided that includes continuously introducing the glass melt into a stirrer vessel, stirring the glass melt in the stirrer vessel by at least one blade stirrer, continuously discharging the glass melt from the stirrer vessel, and shaping the glass melt to obtain the glass article. The blade stirrer comprises at least one stirrer blade fixed and basically vertical to a stirrer shaft of the stirrer vessel. The method is characterized in that: the stirring is sufficient to draw the glass melt located at a surface of the stirrer vessel into the stirrer vessel so that a formation of a surface layer of the glass melt with a different composition from the composition of the glass melt introduced is prevented or at least minimized; and the stirring is sufficient so that the glass melt which is located at a surface in the stirrer vessel is not drawn into the stirrer vessel or is drawn in only insubstantially.

Description

technical field [0001] The invention relates to a method for producing glass articles from glass melts. [0002] Furthermore, the invention relates to a plant for producing glass articles from a glass melt. Background technique [0003] Such methods and devices are known in principle, for example from documents DE 10 2006 060 972 A1, DE 10 2007 035 203 A1. [0004] The stirring device used here and the blade stirrer arranged in the device are usually designed in such a way that the following conditions are met: [0005] - Higher uniformity index H = N · v · ρnLD 2 m · > 6000 , in [0006] N: Number of stirring devices connected one after the other [0007] v: Stirrer speed [0008] ρ: Density of the glass [0009] n: number of stirrer blades [0010] L: Inte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03B5/187
CPCC03B5/20Y02P40/57C03B5/187B01F27/192B01F27/50B01F33/811B01F35/53B01F27/112B01F27/0722
Inventor F-T·雷特斯K·瑙曼M·布予克纳-布里高迪诺N·格豪利希-希克曼J·P·施戴格雷德
Owner SCHOTT AG
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