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Glass plate

A glass plate, quality technology, applied in glass tempering, glass manufacturing equipment, manufacturing tools, etc., can solve problems such as unusable

Inactive Publication Date: 2005-06-08
AGC INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the thickness of the glass plate is 2-3 mm, the degree of quenching needs to be greatly increased, and the conventional method cannot be used

Method used

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Embodiment Construction

[0038] Now, the present invention will be described in detail with reference to some preferred embodiments.

[0039] The average linear coefficient of thermal expansion of the glass plate used for the quenching method of the present invention is at least 88×10 at a temperature of 50-300° C. -7 / °C. If the average linear thermal expansion coefficient is lower than this value, the quenchability of the glass plate will be deteriorated. The average linear thermal expansion coefficient is preferably at least 89×10 -7 / ℃, preferably at least 90×10 -7 / °C. In many cases, however, glasses with extremely high average linear thermal expansion coefficients have significantly different physical properties, such as softening points, compared to commonly used soda lime silicate glasses. Therefore, in order to use this glass, the production method must be changed, which is not practical. The upper limit of the average linear thermal expansion coefficient between 50-300°C is actually 92×...

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PUM

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Abstract

The invention provides a glass plate, which has the following composition: 66.0-74.0% by mass SiO2, 2.0-4.0% by mass Al2O3, 7.0-10.0% by mass CaO, 3.8-6.0% by mass MgO, 12.6-14.6% by mass Na2O and 0.4- 2.0% by mass K2O, the total amount of the above components is at least 96% by mass, and the total amount of SiO2+Al2O3 is 70.0-74.4% by mass, the total amount of CaO+MgO is 12.0-14.5% by mass, the total amount of Na2O+K2O 13.5-15.5% by mass, CaO / MgO mass ratio is 1.7-2.2. The above-mentioned glass sheet is easy to quench, has a high softening point, and does not substantially impair stability during float manufacturing.

Description

[0001] This application is a divisional application of a Chinese patent application with an application date of March 26, 2002, an application number of 02107692.8 and an invention title of "glass plate and quenching method thereof". technical field [0002] The present invention relates to a glass plate that can be easily tempered by heating and a tempering method thereof. Background technique [0003] A glass plate made of common soda lime silicate (soda lime silicate) is generally used as a substrate for heating tempered glass. This tempered glass is usually made by heating the substrate to a predetermined initial glass quenching temperature and then quenching it. In many cases, this quenching is by blowing air against the heated glass sheet. [0004] In recent years, in order to reduce the weight of automobiles, it is necessary to manufacture automobile window panes with thinner glass sheets. However, if the thickness of the glass plate is 2-3 mm, the degree of quenchi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03B27/00C03B27/04C03C3/087C03C23/00
CPCC03B27/04C03B27/0413C03C3/087C03C23/007C03B27/00
Inventor 依田和成加藤保真赤田修一
Owner AGC INC
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