CN109206003B - Tempering method for preventing glass plate from warping - Google Patents
Tempering method for preventing glass plate from warping Download PDFInfo
- Publication number
- CN109206003B CN109206003B CN201811212669.1A CN201811212669A CN109206003B CN 109206003 B CN109206003 B CN 109206003B CN 201811212669 A CN201811212669 A CN 201811212669A CN 109206003 B CN109206003 B CN 109206003B
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- China
- Prior art keywords
- glass plate
- potassium nitrate
- keeping
- solution
- temperature
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Classifications
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B27/00—Tempering or quenching glass products
- C03B27/02—Tempering or quenching glass products using liquid
- C03B27/03—Tempering or quenching glass products using liquid the liquid being a molten metal or a molten salt
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B25/00—Annealing glass products
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C21/00—Treatment of glass, not in the form of fibres or filaments, by diffusing ions or metals in the surface
- C03C21/001—Treatment of glass, not in the form of fibres or filaments, by diffusing ions or metals in the surface in liquid phase, e.g. molten salts, solutions
- C03C21/002—Treatment of glass, not in the form of fibres or filaments, by diffusing ions or metals in the surface in liquid phase, e.g. molten salts, solutions to perform ion-exchange between alkali ions
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
- Y02P40/57—Improving the yield, e-g- reduction of reject rates
Abstract
A tempering method for preventing a glass plate from warping is characterized by comprising the following steps; preheating, namely placing a glass plate in a preheating furnace, heating to 420 ℃ by adopting hot gas, and keeping for 2 hours; step two, tempering, namely soaking the preheated glass plate in a solution prepared by mixing potassium nitrate and sodium nitrate, keeping the temperature of the solution at 450 ℃, and keeping the constant-temperature soaking time at 7.5 hours; annealing, namely taking the tempered glass plate out to anneal for 1.5 hours in a normal-temperature environment; step four, strengthening, namely placing the glass plate in a potassium nitrate solution, keeping the constant temperature of the potassium nitrate solution at 350 ℃, and strengthening for 0.5 hour; and step five, cooling, namely taking the glass plate out, and naturally cooling or air cooling to normal temperature to obtain the flat tempered glass plate. The process is simple, easy to realize, suitable for large-batch production and capable of greatly improving the yield. The glass warpage is greatly reduced after the tempering treatment, and the like.
Description
Technical Field
The invention relates to a tempering method for preventing a glass plate from warping.
Background
At present, the glass plates of display screens of existing smart phones, navigators, tablet computers and the like need to be tempered, a chemical tempering method is often adopted, namely, potassium ions and sodium ions on the surfaces of the glass plate structures are subjected to ion exchange to form a strengthening layer by heating single potassium nitrate to a set temperature, and the warping of the tempered glass products by the existing tempering process is 1.0mm or more. Thus, the tempering easily causes low yield and large expansion coefficient which is more than 5.2 per mill.
In order to overcome the defects, a tempering method for preventing the glass plate from warping is developed.
Disclosure of Invention
The invention aims to solve the technical problem of providing a tempering method for preventing a glass plate from warping, which has the advantages of simple process, easy realization, suitability for large-batch production and great improvement of the yield. The glass warpage is greatly reduced after the tempering treatment, and the like.
In order to achieve the above object, the present invention provides a tempering method for preventing a glass plate from warping, comprising the steps of;
preheating, namely placing a glass plate in a preheating furnace, heating to 420 ℃ by adopting hot gas, and keeping for 2 hours;
step two, tempering, namely soaking the preheated glass plate in a solution prepared by mixing potassium nitrate and sodium nitrate, keeping the temperature of the solution at 450 ℃, and keeping the constant-temperature soaking time at 7.5 hours;
annealing, namely taking the tempered glass plate out and annealing for 1.5 hours at normal temperature;
step four, strengthening, namely placing the glass plate in a potassium nitrate solution, keeping the constant temperature of the potassium nitrate solution at 350 ℃, and strengthening for 0.5 hour;
and step five, cooling, namely taking the glass plate out, and naturally cooling or air cooling to normal temperature to obtain the flat tempered glass plate.
In one or more embodiments of the present invention, the weight ratio of the potassium nitrate in the second step is 52%, and the weight ratio of the sodium nitrate is 48%.
In one or more embodiments of the present invention, the potassium nitrate solution in the fourth step is pure potassium nitrate.
In one or more embodiments of the invention, the solution of potassium nitrate and sodium nitrate in the second step is placed in a constant temperature furnace.
In one or more embodiments of the invention, the glass sheet has a thickness of 0.7 mm.
In one or more embodiments of the present invention, the length of the rectangular glass plate is 239.28mm, the width is 158.06mm, the glass warp of the tempered glass plate is: 0.4 plus or minus 0.02 mm.
Compared with the background technology, the invention has the following effects:
due to the adoption of the scheme, the process is simple, easy to realize, suitable for large-batch production and greatly improved in yield. The glass warpage is greatly reduced after the tempering treatment, and the like.
[ detailed description ] embodiments
The embodiment provides a tempering method for preventing a glass plate from warping, which comprises the following steps;
preheating, namely placing a glass plate in a preheating furnace, heating to 420 ℃ by adopting hot gas, and keeping for 2 hours;
step two, tempering, namely soaking the preheated glass plate in a solution prepared by mixing potassium nitrate and sodium nitrate, keeping the temperature of the solution at 450 ℃, and keeping the constant-temperature soaking time at 7.5 hours;
annealing, namely taking the tempered glass plate out and annealing for 1.5 hours at normal temperature;
step four, strengthening, namely placing the glass plate in a potassium nitrate solution, keeping the constant temperature of the potassium nitrate solution at 350 ℃, and strengthening for 0.5 hour;
and step five, cooling, namely taking the glass plate out, and naturally cooling or air cooling to normal temperature to obtain the flat tempered glass plate.
In the second step, the weight ratio of potassium nitrate is 52%, and the weight ratio of sodium nitrate is 48%. The solution of potassium nitrate and sodium nitrate in proportion is placed in a constant temperature furnace. The potassium nitrate solution in the fourth step is pure potassium nitrate. The thickness of the glass plate is 0.7 mm. The length that the glass board is the rectangle is 239.28mm, width 158.06mm, the glass warpage of toughened glass board: 0.4 plus or minus 0.02 mm.
The weight ratio of potassium nitrate 52% to sodium nitrate 48% is used for tempering, and the glass warpage can be reduced to a great extent after potassium ions and sodium ions react with the glass surface in the tempering process with the soaking time of 7.5 hours, the process tempering warpage is 0.2-0.6 mm, and the warpage is obviously reduced. The process is simple, easy to realize, suitable for large-batch production and capable of greatly improving the yield. The glass warpage is greatly reduced after the tempering treatment, and the like.
While this invention has been described in terms of preferred embodiments, there are alterations, permutations, and equivalents, which fall within the scope of this invention. It should also be noted that there are many alternative ways of implementing the invention.
It is therefore intended that the following appended claims be interpreted as including all such alterations, permutations, and equivalents as fall within the true spirit and scope of the present invention. With the above structure and principle in mind, those skilled in the art should understand that the present invention is not limited to the above embodiments, and modifications and substitutions based on the known technology in the field are within the scope of the present invention, which should be limited by the claims.
Claims (3)
1. A tempering method for preventing a glass plate from warping is characterized by comprising the following steps;
preheating, namely placing a glass plate in a preheating furnace, heating to 420 ℃ by adopting hot gas, and keeping for 2 hours;
step two, tempering, namely soaking the preheated glass plate in a solution prepared by mixing potassium nitrate and sodium nitrate, keeping the temperature of the solution at 450 ℃, and keeping the constant-temperature soaking time at 7.5 hours;
annealing, namely taking the tempered glass plate out and annealing for 1.5 hours at normal temperature;
step four, strengthening, namely placing the annealed glass plate in a potassium nitrate solution, keeping the constant temperature of the potassium nitrate solution at 350 ℃, and strengthening for 0.5 hour;
step five, cooling, taking out the strengthened glass plate, and naturally cooling or air-cooling to normal temperature to obtain a flat tempered glass plate;
the weight ratio of potassium nitrate in the second step is 52%, the weight ratio of sodium nitrate is 48%, and the solution of potassium nitrate and sodium nitrate in the second step is placed in a constant temperature furnace;
the potassium nitrate solution in the fourth step is pure potassium nitrate.
2. The tempering method for preventing the glass sheet from being warped according to claim 1, wherein: the thickness of the glass plate is 0.7 mm.
3. The tempering method for preventing the glass sheet from being warped according to claim 1, wherein: the length that the glass board is the rectangle is 239.28mm, width 158.06mm, the glass warpage of toughened glass board: 0.4 plus or minus 0.02 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811212669.1A CN109206003B (en) | 2018-10-18 | 2018-10-18 | Tempering method for preventing glass plate from warping |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811212669.1A CN109206003B (en) | 2018-10-18 | 2018-10-18 | Tempering method for preventing glass plate from warping |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109206003A CN109206003A (en) | 2019-01-15 |
| CN109206003B true CN109206003B (en) | 2022-03-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811212669.1A Active CN109206003B (en) | 2018-10-18 | 2018-10-18 | Tempering method for preventing glass plate from warping |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111333348A (en) * | 2020-03-10 | 2020-06-26 | 醴陵旗滨电子玻璃有限公司 | Chemical strengthening method, chemical strengthening device and chemically strengthened glass |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107986609A (en) * | 2017-12-04 | 2018-05-04 | 广东北玻电子玻璃有限公司 | The steel process method of display screen glass plate |
| CN108516702A (en) * | 2018-05-23 | 2018-09-11 | 河北视窗玻璃有限公司 | The method and reinforcing jig of warpage are generated in a kind of reduction chemically enhancing glass |
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2018
- 2018-10-18 CN CN201811212669.1A patent/CN109206003B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107986609A (en) * | 2017-12-04 | 2018-05-04 | 广东北玻电子玻璃有限公司 | The steel process method of display screen glass plate |
| CN108516702A (en) * | 2018-05-23 | 2018-09-11 | 河北视窗玻璃有限公司 | The method and reinforcing jig of warpage are generated in a kind of reduction chemically enhancing glass |
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| CN109206003A (en) | 2019-01-15 |
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Address after: 519000 room 105-73138, No.6 Baohua Road, Hengqin New District, Zhuhai City, Guangdong Province (centralized office area) Applicant after: Huabo video (Zhuhai) Technology Co.,Ltd. Address before: 519000 basement 1-3, block a and B, No.8 Baowan Road, Xiangzhou District, Zhuhai City, Guangdong Province Applicant before: GUANGDONG NORTHGLASS ELECTRONIC GLASS Co.,Ltd. |
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