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Manufacturing method of float glass

A float glass and manufacturing method technology, applied in glass production and other directions, can solve the 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 rise of haze

Active Publication Date: 2016-02-03
ASAHI GLASS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Manufacturing method of float glass
  • Manufacturing method of float glass

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Experimental program
Comparison scheme
Effect test

Embodiment

[0073] Hereinafter, the present invention will be specifically explained through examples and the like, but the present invention is not limited to these examples.

[0074] [Measurement 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 the quartz tube through the side wall of the tank with a pump. The suction speed is set to 2NL / min (=2×10 -3 Nm 3 / min), the total suction volume is set to 100NL (=0.1Nm 3 ).

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

example 1～ example 7

[0100] In Examples 1 to 7, except for changing the formula of the glass raw material, the same operation was performed to manufacture float glass. Each glass raw material changes the sulfate (CaSO) 4 ) Or chloride (CaCl 2 ) To prepare.

[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 sulfate and chloride in Examples 1 to 6 is a trace amount, and the addition amount of sulfate and chloride in Example 7 is zero. 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 by 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, the total content of alkali metal oxides is 0.1% or less.

[0102] The above data of the float glass of E...

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Abstract

The present invention relates to a method for producing float glass, which is characterized in that it includes a step of cooling the molten glass while flowing the molten glass in a predetermined direction on molten tin in a float tank, and molding it into a strip shape. In the above-mentioned molten glass, the atmosphere on the above-mentioned molten glass is a reducing atmosphere containing hydrogen, the atmosphere contains additives including sulfur or chlorine, and the concentration of the additives in the atmosphere is 1 mg / Nm3 or more above at least a part of the molten glass.

Description

Technical field [0001] The present invention relates to a manufacturing method of float glass. Background technique [0002] The manufacturing method of float glass includes a process of cooling the molten glass while flowing the molten glass in a predetermined direction on the molten tin in the float tank (hereinafter also referred to as the "tank") to form a strip (for example, refer to Patent Document 1). [0003] In order to prevent the oxidation of molten tin, the atmosphere in the tank is mostly a reducing atmosphere containing hydrogen. The hydrogen gas reacts with oxygen mixed in from the outside to prevent the oxidation of molten tin. [0004] On the other hand, the aforementioned Patent Document 1 discloses that the atmosphere in the tank is an oxidizing atmosphere. Since the oxidizing atmosphere reduces the surface tension of molten glass, the molding of molten glass is easy. As the oxidizing atmosphere, it contains sulfur dioxide (SO 2 ) Gas, sulfur trioxide (SO 3 ) T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03B18/20C03C3/078C03C3/085C03C3/087C03C3/089C03C3/091C03C3/093
CPCC03B18/20C03C3/078C03C3/091C03C3/093Y02P40/57C03B18/02
Inventor 谷井史朗福原一浩
Owner ASAHI GLASS CO LTD