Method for manufacturing tempered glass and device for manufacturing tempered glass
A technology for strengthening glass and a manufacturing method, which is applied in the field of equipment for strengthening glass, and can solve the problems of inability to obtain impact resistance of end faces, progression of end face cracks, damage and the like
Active Publication Date: 2018-08-28
NIPPON ELECTRIC GLASS CO LTD
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Problems solved by technology
On the other hand, in such a tempered glass sheet, a tensile stress layer is formed corresponding to the compressive stress layer on the main surface, but if the tensile stress becomes too large, it is easy to cause cracks on the end surface to progress. Damage caused (so-called self-sabotage)
In addition, in the case where the entire compressive stress layer on the surface of the glass plate is formed shallow in order to reduce such tensile stress, there is a problem that sufficient impact resistance cannot be obtained at the end surface.
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[0028] Hereinafter, the manufacturing method of the tempered glass which concerns on embodiment of this invention is demonstrated. FIG. 1 : is a figure which shows an example of the manufacturing method of the tempered glass of this invention.
[0029] First, implement Figure 1A The processing of the preparatory steps shown. A preparation process is a process of preparing raw glass G1. The raw glass G1 is glass that can be strengthened by an ion exchange method.
[0030] In raw glass G1, it is preferable to contain SiO in mass % as a glass composition 2 45~75%, Al 2 O 3 1~30%, Na 2 O 0~20%, K 2 O 0~20%. When the glass composition range is limited as described above, it becomes easy to achieve both ion exchange performance and devitrification resistance at a high level.
[0031] The plate thickness of the raw glass G1 is, for example, 1.5 mm or less, preferably 1.3 mm or less, 1.1 mm or less, 1.0 mm or less, 0.8 mm or less, 0.7 mm or less, 0.6 mm or less, 0.5 mm or les...
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Abstract
The method for manufacturing tempered glass by performing ion exchange on the surface layer of glass is characterized by including: a step of forming, on at least a portion of the surface of glass, anion permeation suppression film that suppresses permeation of ions; and a step of bringing molten salt into contact with the surface of the glass on which the ion permeation suppression film is formed and performing ion exchange. The molten salt has a pH of 6.5 or higher when mixed with water to produce an aqueous solution with a concentration of 20 mass%.
Description
technical field [0001] The present invention relates to a method for producing tempered glass and an apparatus for producing tempered glass, and more specifically, to a method for producing tempered glass that chemically strengthens a glass plate by an ion exchange method, and an apparatus for tempering glass. Background technique [0002] Conventionally, a chemically strengthened tempered glass plate has been used as a cover glass in a touch panel display mounted in an electronic device such as a smartphone or a tablet. [0003] Such a tempered glass plate is usually produced by chemically treating a glass plate containing an alkali metal as a composition with a tempering solution to form a compressive stress layer on the surface. Since such a tempered glass sheet has a compressive stress layer on the main surface, the impact resistance to the main surface is improved. On the other hand, inside such a tempered glass sheet, a tensile stress layer is formed corresponding to ...
Claims
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IPC IPC(8): C03C21/00C03C3/083C03C17/23
CPCC03C3/083C03C17/23C03C21/00
Inventor 田中敦深田睦木下清贵
Owner NIPPON ELECTRIC GLASS CO LTD