Laser-Structured Glass Plate for Stronger Scratch-Resistant Cut Edges
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Solution Overview
Problem
The existing glass plate production methods face challenges in handling glass substrates during chemical strengthening, leading to difficulties in ensuring the quality of strength and external appearance of the final glass articles, with issues such as scratches and insufficient strength at the end faces.
Innovation Solution
A method involving laser irradiation to create in-plane void regions and internal void rows in a glass material, followed by chemical strengthening, which allows for the formation of a compressive stress layer even at the cut surfaces, enhancing the strength and reducing the risk of scratches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If glass substrates are handled from cutting to chemical strengthening in the related-art method, then the glass substrates can be chemically strengthened, but the glass substrates are prone to scratches on the end face and require careful handling
Solution Approach 1:
The patent applies chemical strengthening treatment to the glass material before cutting it into substrates. This preliminary action ensures that the glass is already strengthened before handling and processing, eliminating the risk of scratches on end faces that would occur if strengthening were done after cutting. The glass material is chemically strengthened in its bulk form, then cut into final substrate shapes.
2Ease of manufacture
If chemical strengthening is applied to a large-sized glass material in advance, then the glass material can be cut into glass articles, but the end face of the glass articles will not be chemically strengthened and insufficient strength is acquired
Solution Approach 1:
The patent creates virtual end faces with specific void structures (in-plane void regions with voids of 0.2-10 μm diameter arranged at intervals of 1-20 μm) at the locations where end faces will eventually form. These localized void structures enable selective chemical strengthening at the end face regions while maintaining the ability to cut the glass into final article shapes. The void structures are precisely positioned to ensure that when the glass is cut, the end faces will have the necessary void patterns for chemical strengthening.
3Strength
If the surface of glass material is chemically strengthened, then the glass material has improved strength, but cutting the glass articles becomes difficult
Solution Approach 1:
The patent performs chemical strengthening after cutting the glass material into final article shapes, not before. This sequencing allows easy cutting of the glass material while still achieving chemical strengthening of the final substrates. The process order is: (1) cut glass material into substrates, (2) apply chemical strengthening to the cut substrates. This resolves the contradiction by performing strengthening at the appropriate stage when cutting is no longer needed.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method produces glass articles with improved strength and reduced risk of scratches, while maintaining the external appearance quality, by forming a compressive stress layer throughout the glass plate, including the cut surfaces, thus addressing the challenges of handling and strength consistency.
Implementation Method 1
irradiating the first main surface of the glass material with a laser to form an in-plane void region having a plurality of voids arranged on the first main surface
Implementation Method 2
The chemical strengthening treatment is a process of immersing a glass substrate in a molten salt containing an alkali metal to replace alkali metal ions having a smaller atomic diameter present on the surface of the glass substrate with alkali metal ions having a larger atomic diameter present in the molten salt
Data Source
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AI summary
A glass plate production method includes (1) preparing a glass material having a first main surface and a second main surface opposite to each other; (2) irradiating the first main surface of the glass material with a laser to form an in-plane void region having a plurality of voids arranged on the first main surface, and forming a plurality of internal void rows each having one void or two or more voids arranged from the in-plane void region toward the second main surface of the glass material; and (3) chemically strengthening the glass material having the internal void rows formed therein.