# US 2014/0196501 A1 · Manufacturing method for sheet glass and manufacturing method for glass substrate

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- Number: US 2014/0196501 A1
- Document ID: US20140196501A1
- Status: Published application
- Kind: A1
- Application number: 14/212,433
- Filed: 2014-03-14
- Published: 2014-07-17
- Earliest claimed: 2011-11-10
- Assignees: Furukawa Electric Co., Ltd.
- Applicants: Furukawa Electric Co., Ltd.
- Inventors: Kousuke Nakao; Toshiyuki Asai
- Web page: https://patentgrep.com/patent/US20140196501A1

## CPC

- C03B 23/037: by drawing
- C03B 21/00: Severing glass sheets, tubes or rods while still plastic
- C03B 21/04: by punching out
- G01B 5/00: Measuring arrangements characterised by the use of mechanical techniques
- G01B 5/06: for measuring thickness
- G01B 21/08: for measuring thickness
- C03B: MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- G01B: MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS

## Abstract

A method of manufacturing a sheet glass includes: a re-draw process forming a sheet glass by, heating and softening a glass preform manufactured by float method, and extending the glass preform to a desirable plate thickness. An extension direction in which the glass preform is extended by the re-draw process is 90 degrees with respect to a direction in which molten glass is fed in the float method.

## Claims

### Claim 1

A method of manufacturing a sheet glass, the method comprising a re-draw process forming a sheet glass by, heating and softening a glass preform manufactured by float method, and extending the glass preform to a desirable plate thickness, wherein
an extension direction in which the glass preform is extended by the re-draw process is 90 degrees with respect to a direction in which molten glass is fed in the float method.

### Claim 2 (depends on 1)

The method according to claim 1, further comprising a control process controlling at least one of feed speed of the glass preform and pull-in speed at which the glass preform is pulled based on plate thickness profile of the glass preform.

### Claim 3 (depends on 1)

The method according to claim 1, further comprising a pull-in-speed control process controlling, based on plate thickness profile of the glass preform, pull-in speed at which the glass preform is pulled, wherein
the pull-in-speed control process comprises a pull-in speed compensation process which comprises
measuring plate thickness profile along the extension direction of the sheet glass formed by a preceding first glass preform, calculating a compensation value compensating for the pull-in speed, at which the first glass preform is pulled, based on profile of difference between the measured plate thickness profile of the sheet glass and a target plate thickness of the sheet glass, and compensating for pull-in speed of a second succeeding glass preform by using the compensation value.

### Claim 4 (depends on 3)

The method according to claim 3, wherein the first glass preform and the second glass preform are cut out from positions adjacent in a direction in which molten glass is fed in the float method.

### Claim 5 (depends on 1)

A method of manufacturing a glass substrate, the method comprising:
sheet-glass-manufacturing process manufacturing a sheet glass by the method according to claims 1; and
coring process coring in one line so that a center of the glass substrate is positioned substantially on a center in a width direction of the sheet glass.