Title:
METHOD FOR PRODUCING GLASS SHEET
Document Type and Number:
WIPO Patent Application WO/2012/043769
Kind Code:
A1
Abstract:
In order for the formation or air bubbles in glass to be effectively inhibited while the life span of production equipment is extended, a method for producing a glass sheet comprises a clarification step, a homogenization step, and a feeding step, and this series of steps is performed in a platinum or platinum-alloy container. The clarification step comprises: a first step in which molten glass is heated within a range of 1610 to 1700ºC and up to a maximum temperature (T1) in the series of processes in order to cause air bubbles in the molten glass to float up and thereby remove the air bubbles; and a second step in which, after the first step, the gas component of the molten glass is absorbed at a temperature lower than the maximum temperature (T1) in order to remove the air bubbles. The water vapor partial pressure of the atmosphere surrounding a clarification cell in the first step is lower than the water vapor partial pressure of the atmosphere surrounding a clarification cell in at least part of the second step. The boundary between the first step and the second step is a temperature (T2) at which the molten glass, once having reached the maximum temperature (T1), is at least 30ºC lower than the maximum temperature (T1).
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Inventors:
MURAKAMI TSUGUNOBU (JP)
Application Number:
PCT/JP2011/072471
Publication Date:
April 05, 2012
Filing Date:
September 29, 2011
Export Citation:
Assignee:
AVANSTRATE INC (JP)
MURAKAMI TSUGUNOBU (JP)
MURAKAMI TSUGUNOBU (JP)
International Classes:
C03B5/225; C03B5/43; C03B17/06
Foreign References:
| JP2001503008A | 2001-03-06 |
Attorney, Agent or Firm:
KATO, Hidetada et al. (JP)
Hidetada Kato (JP)
Hidetada Kato (JP)
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Claims: