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Method for producing float glass

A technology of float glass and its manufacturing method, which is applied in glass production, etc., can solve problems such as the inability to exist stably, the inability to reduce the surface tension of molten glass, etc., and achieve the effect of suppressing the increase of haze

Active Publication Date: 2014-03-26
ASAHI GLASS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] It should be noted that sulfur dioxide gas and sulfur trioxide gas will become hydrogen sulfide (H 2 S) Gas, etc. cannot exist stably, so the surface tension of the molten glass cannot be lowered

Method used

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  • Method for producing float glass
  • Method for producing float glass

Examples

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Embodiment

[0073] Hereinafter, although an Example etc. demonstrate this invention concretely, this invention is not limited to these examples.

[0074] [Measuring method of various data]

[0075] (Sulfur concentration / chlorine concentration in the atmosphere in the tank)

[0076] The atmosphere in the tank is obtained by pumping through the quartz tube on the side wall of the tank. The suction speed is set to 2NL / min (=2×10 -3 N m 3 / min), the total suction volume is set to 100NL (=0.1Nm 3 ).

[0077] The length of the quartz tube was 120 cm, and the suction port of the quartz tube was arranged at a position 70 cm inside from the inner wall surface of the tank. The suction port of the quartz tube is arranged in the center of the width direction of the molten glass. The viscosity reaches 1×10 5 Lateral to the position of dPa·s. A part of the quartz tube was exposed outside the tank, and the quartz tube was cooled with dry ice from the outside.

[0078] The atmosphere in the tank ...

example 1～ example 7

[0100] In Examples 1 to 7, float glass was produced in the same manner except that the formulation of the glass raw materials was changed. Each glass raw material is changed by changing the sulfate (CaSO 4 ) or chloride (CaCl 2 ) to prepare the amount of addition.

[0101] Example 1, Example 4, and Example 7 are comparative examples. Example 2, Example 3, Example 5 and Example 6 are examples. In addition, the addition amount of the sulfate and chloride in Examples 1-6 was trace amount, and the addition amount of the sulfate and chloride in Example 7 was 0. Therefore, the float glass obtained in each example basically has the same composition, and the float glass obtained in Example 4 contains SiO when expressed in terms of mass percentage based on oxides. 2 : 59.5%, Al 2 o 3 : 17%, B 2 o 3 : 8%, MgO: 3.3%, CaO: 4%, SrO: 7.6%, BaO: 0.1%, ZrO 2 : 0.1%, and MgO+CaO+SrO+BaO: 15%, the balance is unavoidable impurities, and the total content of alkali metal oxides is 0.1% o...

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Abstract

The present invention relates to a method for producing float glass, including a step in which molten glass is cooled on molten tin inside a float bath while being made to flow in a predetermined direction, and is moulded into a strip-shape, wherein the atmosphere on the molten glass is a hydrogen gas-containing reducing atmosphere which includes additional substances comprising sulphur or chlorine, the concentration of additional substances in the atmosphere being 1 mg / Nm3 or greater over at least part of the molten glass.

Description

technical field [0001] The present invention relates to a method of manufacturing float glass. Background technique [0002] The method for producing float glass includes a step of cooling the molten glass while flowing the molten glass in a predetermined direction on molten tin in a float tank (hereinafter also simply referred to as "tank"), and molding it into a strip shape (for example, see Patent Document 1). [0003] In order to prevent the oxidation of molten tin, the atmosphere in the tank is often a reducing atmosphere containing hydrogen. Hydrogen prevents oxidation of molten tin by reacting with oxygen mixed in from the outside. [0004] On the other hand, the aforementioned Patent Document 1 discloses that the atmosphere in the tank is made into an oxidizing atmosphere. Since the oxidizing atmosphere lowers the surface tension of the molten glass, molding of the molten glass is easy. As an oxidizing atmosphere, it is described that the atmosphere containing su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03B18/20C03C3/078C03C3/085C03C3/087C03C3/089C03C3/091C03C3/093
CPCC03C3/093C03C3/078C03C3/091C03B18/20Y02P40/57C03B18/02
Inventor 谷井史朗福原一浩
Owner ASAHI GLASS CO LTD
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