Asahi Glass Company, Limited

Agc Inc.

Kazushige Yoda

Satoshi Yoshida

Yasumasa Kato

Isao Saito

Junji Hori

Shuichi Akada

Masao Fukami

Atsushi Nakano

Toshimi Yajima

Jiro Nishihama

Nozomi Otsubo

Hiromasa Tominaga

Tomohiro Suwa

Tomohiro Yonemichi

Shinya Ohta

Shigeru Ezaki

Kiyota Miyazaki

Hiroshi Hori

To provide a tempered glass sheet having a thickness of from 1.8 to less than 2.5 mm, which is capable of satisfying the fragmentation quality and impact strength quality required for windowpanes for automobiles. A tempered glass sheet having a first surface, a second surface opposed to the first surface and a side surface connecting the first and second surfaces, and having a thickness of from 1.8 to less than 2.5 mm, wherein at the first surface, the average value of the surface compressive stress is within a range of from 100 to 160 MPa, and the average value of the surface strength is within a range of from 220 to 400 MPa.

Tempered glass sheet

There is provided a tempered glass plate, wherein a thickness of the tempered glass plate is less than or equal to 2.7 mm, wherein on a surface of the tempered glass plate, a plurality of stress marks are formed, wherein a distance between closest stress marks of the plurality of stress marks is less than or equal to 20 mm, wherein the surface of the tempered glass plate includes a first virtual circle that is formed by connecting points that are separated from a center of one of the plurality of stress marks by 2.5 mm, wherein the tempered glass plate includes a non elastic-wave region that is not affected by an elastic-wave generated during fracturing, and wherein, in the non elastic-wave region, an average number of cracks that exist in the first virtual circle is greater than or equal to 3.4.

Tempered glass plate

The method for tempering a glass sheet of the present invention comprises a heating step of heating the glass sheet to a temperature close to the softening point of the glass sheet, a quenching step of blowing a cooling medium to both surfaces in the thickness direction of the heated glass to cool it, and a pre-quenching step between the heating step and the quenching step and further has an internal heating substep of selectively heating the vicinity of the center portion in the thickness direction of the glass sheet at least in the quenching step, to create such a state that when the temperature at the center portion in the thickness direction of the glass sheet is close to the tempering point, the temperature at the surfaces in the thickness direction of the glass sheet is not higher than the annealing point.

Method for tempering glass sheet, and apparatus therefor

The present invention provides an air-cooling/tempering device and an air-cooling/tempering method for a glass sheet, which are capable of uniformly air-cooling and tempering a glass sheet as a whole without being affected by the pitch between adjacent rollers and a roller diameter. The roller body of each roller forming the air-cooling/tempering device includes a rotary shaft formed of a guide shaft permitting a bendable action; and a plurality of ring rollers carried on the guide shaft and engaged and coupled with adjacent ring rollers; and disc rollers fixedly carried at intervals on ring rollers so as not to overlap the disc rollers on an adjacent roller with respect to a conveying direction of the glass sheet. Further, outlet modules are disposed on ring rollers between adjacent disc rollers through bearings so as to be rotatable with respect to the rotary shaft. The coupled ring rollers can curve the guide shaft to curve the roller body, and the glass sheet is air-cooled and tempered by blowing cooling air to the glass sheet from the outlet modules while the glass sheet is conveyed by the disc rollers rotated via the ring rollers.

Air-cooling/tempering apparatus and air-cooling/tempering method for a glass sheet

A glass plate; a glass plate having a thickness of 2 to 3 mm; a glass plate obtained by a float process; and, a window glass for automobiles.

Glass plate and method for tempering a glass plate

A tempered glass sheet having in its front view a peripheral region including the peripheries, and a central region () occupying inside the peripheral region, wherein the average surface compressive stress in the central region () is larger than the average surface compressive stress in the peripheral region, is presented, whereby a tempered glass sheet having a thickness thinner than conventional ones can be provided.

Tempered glass sheet, process and apparatus therefor

There is provided a tempered glass sheet, which is air-cooled and tempered by a cooling medium blown from a plurality of nozzles provided in rows so as to have a stress pattern formed therein, comprising a stress pattern formed in the glass sheet such that a plurality of cells range to form the stress pattern, the respective cells have centers just under the respective nozzles; each of the cells having a central region with a membrane stress in a compression state; each of the cells having a peripheral region with a membrane stress in a compression state; and each of the cells having a region between the central region and the peripheral region with a membrane stress in a tension state. There is also provided a method for producing the tempered glass sheet.

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Chiyoda-ku, Japan

Kazushige Yoda