Methods and glass manufacturing system for impacting compaction in a glass sheet

Patent metadata

Field	Value
Publication number	US-11174192-B2
Application number	US-201515515680-A
Country	US
Kind code	B2
Filing date	Sep 25, 2015
Priority date	Sep 30, 2014
Publication date	Nov 16, 2021
Grant date	Nov 16, 2021

Abstract

Methods and a glass manufacturing system are described herein that impact compaction in a glass sheet. For instance, a method is described herein for impacting compaction in a glass sheet made by a glass manufacturing system. In addition, a glass manufacturing system is described herein which manufactures a glass sheet that meets a compaction target. Plus, a method is described herein for maintaining an uniform compaction between glass sheets made by different glass manufacturing systems.

First claim

The invention claimed is:

1. A glass production method comprising:
selecting a first quantity of raw materials, the first quantity of raw materials comprising an anhydrous boric acid and a boric acid, the first quantity of raw materials defining a first ratio of the anhydrous boric acid to the boric acid;
producing a first quantity of molten glass by melting the first quantity of raw materials in a vessel;
producing a first glass sheet from the first quantity of molten glass;
comparing a measured compaction of the first glass sheet with a compaction target;
determining, based on the measured compaction comparison and based on the first ratio, a second ratio of the anhydrous boric acid to the boric acid for a second quantity of raw materials, the second ratio being different than the first ratio;
producing a second quantity of molten glass by melting the second quantity of raw materials in the vessel, the second quantity of raw materials comprising the anhydrous boric acid and the boric acid, the second quantity of raw materials defining the determined second ratio of the anhydrous boric acid to the boric acid; and
producing a second glass sheet from the second quantity of molten glass.

2. The glass production method of claim 1 , wherein the compaction is measured using an annealing point, such that the second ratio is determined based on a comparison of a measured annealing point of the first glass sheet and a desired annealing point of the first glass sheet.

3. The glass production method of claim 1 , comprising:
continuously producing molten glass by continuously supplying the anhydrous boric acid and the boric acid to the vessel;
continuously producing glass sheets from the molten glass; and
actively controlling a compaction of the glass sheets by continuously varying a ratio of the supplied anhydrous boric acid to the supplied boric acid.

4. The glass production method of claim 3 , comprising continuously varying the ratio of the supplied anhydrous boric acid to the supplied boric acid based on measured annealing points of the glass sheets.

5. The glass production method of claim 1 , comprising determining the second ratio based on a magnitude of disparity between the measured compaction and the compaction target.

6. The glass production method of claim 1 , wherein the first and second quantities of raw materials each comprise a dry silicon dioxide and a wet silicon dioxide, the first quantity of raw materials defining a third ratio of the dry silicon dioxide to the wet silicon dioxide, the dry silicon dioxide having a lower water content than the wet silicon dioxide.

7. The glass production method of claim 6 , comprising determining, based on the compaction comparison and based on the third ratio, a fourth ratio of the dry silicon dioxide to the wet silicon dioxide; and
wherein the second quantity of raw materials comprises the dry and the wet silicon dioxides and defines the fourth ratio of the dry silicon dioxide to the wet silicon dioxide.

8. The glass production method of claim 1 , wherein a controller comprising one or more processors is configured to:
compare the measured compaction of the first glass sheet with the compaction target; and
determine the second ratio based on the compaction comparison and the first ratio, the method comprising:
using the controller to compare the measured compaction of the first glass sheet with the compaction target; and
using the controller to determine the second ratio based on the compaction comparison and the first ratio.

9. The glass production method of claim 1 , comprising:
continuously producing molten glass by continuously supplying the anhydrous boric acid and the boric acid to the vessel;
continuously producing glass sheets from the molten glass; and
using a controller comprising one or more processors to actively control a compaction of the glass sheets by continuously varying a ratio of the supplied anhydrous boric acid to the supplied boric acid.

10. The glass production method of claim 9 , wherein the compaction is measured using an annealing point.

11. The glass production method of claim 9 , wherein the controller is configured to:
determine a first water content of the first quantity of molten glass; and
determine the second ratio of the anhydrous boric acid to the boric acid based on the first water content, the measured compaction of the first glass sheet, the compaction target, and the first ratio of the anhydrous boric acid to the boric acid.

Assignees

• Corning Inc

Inventors

• Bowden Bradley Frederick
• Rapp Douglas Benjamin

Classifications

• C03C1/006 Primary

  to produce glass through wet route · CPC title

• C03B18/02

  Forming sheets · CPC title

• C03C3/093 Primary

  containing zinc or zirconium · CPC title

• C03C3/091 Primary

  containing aluminium · CPC title

• C03B5/16

  Special features of the melting process; Auxiliary means specially adapted for glass-melting furnaces · CPC title