Asahi Glass Company, Limited

Masanobu Shirai

Nobuaki Ikawa

Ryosuke Kato

Satoshi Miyasaka

Junichi Miyashita

Daisuke Kobayashi

Kunio Watanabe

Koji Nakagawa

Yasuo Hayashi

Naoki Okahata

Makoto Fukawa

Shiro Tanii

Kazuhiko Yamanaka

Kuniaki Hiromatsu

Tomohiro Yonemichi

Hideko Nakada

Toshifumi Nihei

Takeo Endo

A method for manufacturing a float glass includes a step of melting a glass raw material, a step of forming the glass melted in the melting step into a glass ribbon while floating the glass on a molten metal, and a step of annealing the glass ribbon. In the forming step, a gas or a liquid containing a molecule having a fluorine atom present therein is blown to the glass ribbon having a viscosity of from 1.0&#xd7;10to 2.5&#xd7;10Pa&#xb7;s.

Method for producing glass sheet

A glass sheet has one surface and the other surface facing the one surface in a thickness direction, wherein a fluorine concentration (average fluorine concentration by SIMS at a depth of 1 to 24 &#x3bc;m) in the one surface is higher than that in the other surface. The following expression is satisfied: 0.07&#x2266;&#x394;F/&#x394;HO. &#x394;F (mol %) is a value obtained by subtracting an average fluorine concentration in the surface having the lower fluorine concentration from that in the surface having the higher fluorine concentration, and &#x394;HO (mol %) is an absolute value of a value obtained by subtracting an average HO concentration in the surface having the higher fluorine concentration from that in the surface having the lower fluorine concentration.

Glass sheet capable of being inhibited from warping through chemical strengthening

An area S (m) of a facing surface of each of injectors which faces a glass ribbon is set so as to satisfy: S&#x2266;(0.0116&#xd7;P&#xd7;Cg&#xd7;T)/{&#x3b5;&#xd7;F&#xd7;&#x3c3;(T&#x2212;T)}, wherein P is an output (ton/day) of the glass ribbon; Cg is a specific heat (J/(kg&#xb7;&#xb0; C.)) of the glass; T is an acceptable temperature drop (&#xb0; C.); &#x3b5; is radiation factor; F is a surface-to-surface view factor; &#x3c3; is Boltzmann's constant; Tis a temperature (K) of the glass ribbon represented by K=(T+T)/2 where Tand Tare measured values of the glass ribbon at the inlet and outlet of the injector, respectively; and Tis a temperature (K) of the facing surface of the injector.

Method for manufacturing glass substrate with layered film

Growing community of inventors

Tokyo, Japan

Masanobu Shirai