Method for reducing warpage developing in glass plate due to chemical strengthening treatment, method for producing glass plate for chemical strengthening, and method for producing chemically strengthened glass plate
A technology of strengthening treatment and manufacturing method, applied in glass production and other directions, can solve problems such as increasing manufacturing cost, and achieve the effects of fully reducing warpage, reducing warpage, and suppressing the generation of cracks
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Embodiment approach 1
[0030] Embodiments of the method of reducing the warpage generated in a glass plate by chemical strengthening treatment according to the present invention will be described. The method of this embodiment is a method for reducing the warpage of the glass sheet produced by chemically strengthening the glass sheet produced by the float method. The temperature range of the strain point of the glass of the plate -70°C to the strain point +20°C was maintained for 10 minutes or more.
[0031] Before the chemical strengthening treatment, the heat treatment of holding the glass plate at the temperature range of the glass strain point of the glass plate -70°C to +20°C for 10 minutes or more can improve (reduce warpage) by chemical strengthening. Warping caused by strengthening treatment. It is an unexpected result that the warpage of the chemically strengthened glass sheet is improved only by performing such a heat treatment prior to the chemical strengthening treatment. This is becau...
Embodiment approach 2
[0050] Embodiments of the method for producing a glass plate for chemical strengthening and the method for producing a glass plate for chemical strengthening according to the present invention will be described.
[0051] The manufacturing method of the glass plate for chemical strengthening of this embodiment includes the following steps:
[0052] (I) the process of manufacturing glass sheets consisting of soda-lime glass by the float process; and
[0053] (II) A step of holding the glass plate produced in the step (I) at a temperature ranging from the strain point of the glass of −70° C. to the strain point of +20° C. for 10 minutes or more. According to this manufacturing method, by including the process (II), even when performing a chemical strengthening process after that, the glass plate which warpage reduces can be manufactured. In addition, the mechanism by which the warpage by the chemical strengthening process performed after that is reduced by process (II) is as dem...
Embodiment 1～14 and comparative example 1～3
[0063] [manufacturing method of glass plate]
[0064] By the float method, a glass plate having a thickness of 0.55 mm was produced. In addition, this glass plate contains soda lime glass, and the glass composition, strain point, and glass transition temperature of this glass are as shown in Table 1. The glass material prepared so as to have the glass composition shown in Table 1 was melted, and the glass material melted on the molten tin in the float bath was formed into a glass ribbon. In this Example, this glass ribbon was cut|disconnected, and the square glass plate of 50 mm x 50 mm was obtained.
[0065] [Table 1]
[0066]
[0067] [Heat treatment and chemical strengthening treatment]
[0068] After the glass plate produced by the float method was washed at normal temperature, it was heated in an electric furnace (“SU-2025” manufactured by MOTOYAMA Co., Ltd.) in a state erected on a glass holder. The heating conditions except comparative example 1 are as table 2 an...
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Abstract
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