Method for producing glass sheet with bent portion and glass sheet with bent portion

Patent metadata

Field	Value
Publication number	US-9376337-B2
Application number	US-201313916686-A
Country	US
Kind code	B2
Filing date	Jun 13, 2013
Priority date	Jun 14, 2012
Publication date	Jun 28, 2016
Grant date	Jun 28, 2016

Abstract

Provided is a method capable of producing a glass sheet with a bent portion in which a flattened portion has high flatness and high smoothness. A flat glass sheet 20 is radiationally heated with a first portion 21 thereof held between first and second heat-insulating members 31, 32 . And then, a second portion 22 a, 22 b of the flat glass sheet 20 not held between the first and second heat-insulating members 31, 32 is bent.

First claim

The invention claimed is:

1. A method for producing a glass sheet with a bent portion, the glass sheet including a flattened portion and the bent portion continued to the flattened portion,
wherein a flat glass sheet is radiationally heated with a first portion of the flat glass sheet held between and in contact with first and second heat-insulating members and then a second portion of the flat glass sheet not held between the first and second heat-insulating members is bent while the first portion is held between and in contact with the first and second heat-insulating members,
wherein the flat glass sheet is heated by radiationally heating an entire region of the second portion until the first portion of the flat glass sheet reaches a temperature equal to or higher than a strain point of the flat glass sheet while the first portion is held between and in contact with the first and second heat-insulating members,
wherein the first and second heat-insulating members include a through hole and a coolant is fed through the through hole to control a temperature of the first and second heat-insulating members holding the first portion so as to avoid a temperature of the first portion from becoming above a softening point of the flat glass sheet, and
wherein the through hole is provided in an internal portion of the first and second heat-insulating members and is configured to direct coolant to the internal portion of the first and second heat-insulating members.

2. The method for producing a glass sheet with a bent portion according to claim 1 , wherein the flat glass sheet is heated so that the second portion of the flat glass sheet reaches a higher temperature than the first portion thereof.

3. The method for producing a glass sheet with a bent portion according to claim 1 , wherein the flat glass sheet used is a flat glass sheet having a linear coefficient of thermal expansion of 120×10 −7 /° C. or less at 30° C. to 380° C.

4. The method for producing a glass sheet with a bent portion according to claim 1 , wherein the heat-insulating members have a lower thermal conductivity than the flat glass sheet.

5. The method for producing a glass sheet with a bent portion according to claim 1 , wherein the heat-insulating members are formed of ceramic material.

6. The method for producing a glass sheet with a bent portion according to claim 1 , wherein the second portion is bent with the flat glass sheet pressed by the first and second heat-insulating members.

7. The method for producing a glass sheet with a bent portion according to claim 1 , wherein the flat glass sheet is heated by a heater disposed at a lateral side of the flat glass sheet.

Assignees

• Nippon Electric Glass Co

Inventors

• Odani Osamu
• Ikemoto Masayuki
• Kobayashi Masahiro
• Iwakoshi Tomoya
• Wada Masanori

Classifications

• C03B23/0066 Primary

  by bending (C03B23/02, C03B23/04, C03B23/18 take precedence) · CPC title

• Y10T428/24264

  Particular fold structure [e.g., beveled, etc.] · CPC title

• C03B23/0256

  Gravity bending accelerated by applying mechanical forces, e.g. inertia, weights or local forces · CPC title

• G06F1/1637

  Details related to the display arrangement, including those related to the mounting of the display in the housing · CPC title

• C03B40/005

  Fabrics, felts or loose covers · CPC title