Stirring blade for molten glass and stirring device therefor

Abstract

The invention provides a stirring blade for molten glass and stirring device therefore, capable of completely stirring the molten glass including the center area in a groove to homogenize the molten glass without increasing rotation speed. The stirring blade comprises: a cross-bar first wing (12) extending along the vertical direction at the position far away from a rotation axle (L10) along the rotation radius direction and rotating adjacent to the inner wall of a stirring groove (1) to stirring the molten glass at the perimeter area of the stirring groove; a cross-bar second wing (13) extending along the rotation radius direction and rotating in the range from the center area of the stirring groove to the perimeter area to stir the molten glass in the range of from the center area to the perimeter area; a circular disk shaped third wing (14) at the inner circle side of the first wing and extending in plane shape along the direction orthogonal with the rotation axle and guiding the molten glass in the center area of the stirring groove to the perimeter area.

Description

technical field [0001] The present invention relates to a stirring blade for molten glass for uniformly stirring molten glass in a stirring tank, and a stirring device having the stirring blade in a stirring tank. Background technique [0002] In the production of glass plates, there is a problem that the presence of inhomogeneous glass in molten glass has a large influence on the deterioration of the quality of glass products. The term "heterogeneous glass" refers to a phenomenon in which glass having a different composition exists in molten glass, and is different from surrounding molten glass in properties such as specific gravity and refractive index. When inhomogeneous glass is present in the molded and cured glass product, striae called striae are formed, causing distortion of the optical image and loss of transparency and reflectivity. [0003] Especially in the field of manufacturing glass substrates and optical glass for flat panel display (FPD), the generation of ...

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Problems solved by technology

[0019] In addition, in the case of the spiral stirring blade described in Patent Document 2, for the purpose of making the molten glass flow along the shape of the spiral blade by the rotational force, in order not to produce a speed difference in the molten glass, the shear melting The effect of the glass is weak, and there is a problem that the stirring effect to disappear the heterogeneous glass is low.

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