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method for producing 3D protective glass

A manufacturing method and technology for protecting glass, applied in glass manufacturing equipment, glass forming, glass reshaping, etc.

Active Publication Date: 2019-03-05
ASAHI GLASS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The cover glass of the image display device requires not only thinner thickness but also a certain level of strength, so chemical strengthening treatment is carried out, but the 3D glass with three-dimensional curved surface in the peripheral part In cover glass, the occurrence of warpage caused by chemical strengthening treatment becomes a problem

Method used

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  • method for producing 3D protective glass

Examples

Experimental program
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Effect test

Embodiment 1、2

[0096] (Examples 1, 2, Comparative Example 1)

[0097] In this embodiment (1, 2), the control temperature T2 [℃] of the male mold in the heating process and the control temperature T1 [℃] of the female mold are controlled to the same temperature, and the control temperature of the male mold in the cooling process is changed. The temperature difference (T2-T1) [°C] between the temperature T2 [°C] and the control temperature T1 [°C] of the cavity mold performed the glass forming step. Thereafter, the amount of warpage when taken out from the mold was evaluated by the following procedure. Specifically, use as image 3 As shown, the central part 211, 221 is a flat surface and the peripheral parts 212, 222 are three-dimensional curved surface shapes throughout the entire circumference of the convex mold 21 and the concave mold 22, manufactured as figure 1 The center portion 110 is shown as a 3D cover glass 100 and the peripheral portion 120 is a three-dimensional curved surface, and w...

Embodiment 3

[0110] In this example, the 3D cover glass obtained in Example 1 and Comparative Example 1 was subjected to chemical strengthening treatment, and the shape change before and after the chemical strengthening treatment was evaluated by the following procedure.

[0111] First, the 3D cover glass obtained in Example 1 and Comparative Example 1 was immersed in potassium nitrate heated to 450 [°C] and melted for 2 hours to perform ion exchange treatment. After that, the 3D cover glass was lifted from the molten salt and slowly cooled to room temperature over 1 hour, thereby performing a chemical strengthening treatment. Furthermore, the 3D cover glass was immersed in an alkali solution (trade name: Sunwash TL-75, manufactured by Lion Corporation) for 4 hours to perform alkali treatment, thereby obtaining a chemically strengthened 3D cover glass.

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Abstract

A method for producing a 3D protective glass, comprises the steps of a glass forming step and a chemical strengthening treatment step, wherein the glass forming step includes a heating step of heatinga flat glass material to a transition temperature Tg [DEG C] or more of the glass material, applying a bending in a thickness direction to at least a portion of a peripheral portion of the glass material using a pair of dies including a punch and a die, and a cooling step of cooling the glass material below the temperature of Tg after the heating step; the chemical strengthening treatment step isa step of performing a chemical strengthening treatment on the glass material after the glass forming step; and the cooling step includes the steps of: recording the control temperature of the die asa control temperature T1 [ DEG C]; when the control temperature of the die is recorded as the control temperature T2 [DEG C], and setting at least one of the T2 and the T1 to be equal to or lower than the Tg of the glass material, wherein the T2 is greater than the T1 and the (T2-T1) is maintained at 10 DEG C or higher.

Description

Technical field [0001] The present invention relates to a three-dimensional protective glass (3D protective glass) used in image display devices used in mobile devices such as mobile phones, smart phones, and tablet terminals, information display centers (CenterInformation Display, CID), and dashboards. ) The manufacturing method. Background technique [0002] In order to improve the design of mobile devices such as mobile phones, smart phones, and tablet terminals, we are studying the application of image display devices used in mobile devices such as figure 1 The 3D protective glass shown. figure 1 To illustrate a configuration example of the 3D cover glass 100, the central portion 110 is a flat surface, and the peripheral portion 120 is a three-dimensional curved surface. [0003] In addition to thinning, the cover glass of the image display device requires a certain strength or more, so it is chemically strengthened. However, in the 3D cover glass with a three-dimensional curve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03B23/03C03C21/00
CPCC03B23/03C03C21/002
Inventor 金杉谕福士恭基和智俊司
Owner ASAHI GLASS CO LTD
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