Film removing method for coated glass
By employing two ion exchange treatments and a polishing process, the problem of warping and deformation during the removal of coated glass in existing technologies has been solved, achieving efficient removal of the coating layer while maintaining the flatness and surface quality of the glass substrate.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-16
- Publication Date
- 2026-03-31
AI Technical Summary
Existing technologies struggle to efficiently remove coatings from coated glass while maintaining the flatness and surface quality of the glass substrate. Conventional methods often result in glass warping and a decline in surface quality.
The process employs a combination of two ion exchange treatments and polishing. First, the coated glass is bent through a first heat treatment, and then it is restored to flatness through a second heat treatment. Finally, the coating layer is removed through polishing.
This effectively avoids warping issues during the removal of the coating layer from coated glass, maintains the flatness and surface quality of the glass substrate, and improves the yield rate.
Smart Images
Figure CN121758078A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of film removal technology, and more specifically, to a method for removing the film from coated glass. Background Technology
[0002] Coated glass (such as ultra-hard anti-reflective coated glass) is widely used in consumer electronics, display devices, and other fields. During the production process or after a product is scrapped, in order to repair defective products or recycle substrate glass, it is necessary to effectively remove the coating layer on the glass surface, and it is essential to ensure that the surface quality, flatness, and mechanical strength of the glass after coating removal meet the requirements for reprocessing or reuse.
[0003] Current technologies typically involve chemical stripping or mechanical polishing to remove the coating after ink removal, followed by tempering and re-polishing. However, both chemical stripping and mechanical polishing negatively impact the surface smoothness and quality of the glass after coating removal. For example, strong acids can non-selectively corrode the entire glass, leading to substrate thinning and warping; while strong alkalis, due to uneven corrosion, easily leave irreparable corrosion marks on the glass surface, affecting appearance and strength; and directly removing the coating through physical grinding can cause severe and irreversible warping deformation of the glass, resulting in a low yield.
[0004] Therefore, how to efficiently remove the coating while ensuring the flatness and surface quality of the glass substrate has become an urgent problem to be solved in this field. Summary of the Invention
[0005] This application provides a method for removing the coating from coated glass, aiming to solve the problem of how to efficiently remove the coating while ensuring the flatness and surface quality of the glass substrate.
[0006] The first aspect of this application provides a method for removing the coating from coated glass, the method comprising: A coated glass is provided, the coated glass including a first side and a second side disposed opposite to each other, the first side being provided with a coating layer and the second side being provided with an ink layer; The coated glass is subjected to ink removal treatment and a first heat treatment, wherein the first heat treatment is used to change the stress state of the coated glass, causing the coated glass to bend in a direction away from the second surface. The first surface of the coated glass after the first heat treatment is polished to remove the coating layer. The coated glass with the coating layer removed is subjected to a second heat treatment to obtain coated glass without coating. The second heat treatment is used to adjust the stress state of the coated glass with the coating layer removed so that the surface of the coated glass with the coating layer removed is restored to flatness.
[0007] In one optional embodiment, the first heat treatment is an ion exchange treatment, and the first heat treatment of the coated glass includes: The coated glass is immersed in a first ion exchange solution, causing the ions in the coated glass to undergo a displacement reaction with the ions in the first ion exchange solution, thereby making the compressive stress on the second surface greater than that on the first surface.
[0008] In one optional embodiment, for the coated glass after the first heat treatment, the surface compressive stress of the second surface is greater than or equal to 80 MPa and less than or equal to 120 MPa. For the coated glass after the first heat treatment, the surface compressive stress of the first surface is greater than or equal to 160 MPa and less than or equal to 200 MPa.
[0009] In one optional embodiment, after the first heat treatment, the coated glass is convex and curved, with the height difference between its center and edge in the normal direction being greater than or equal to 0.8 mm and less than or equal to 1 mm.
[0010] In one optional embodiment, the second heat treatment is an ion exchange treatment, and the second heat treatment of the coated glass to remove the coating layer includes: The glass after the coating layer is removed is immersed in a second ion exchange solution, so that both the first and second surfaces of the glass after the coating layer is removed undergo ion exchange with ions in the second ion exchange solution, and the amount of ion exchange on the first surface is controlled to be less than that on the second surface.
[0011] In one alternative embodiment, the first heat treatment includes an ion exchange treatment based on a first ion exchange solution, the second heat treatment includes an ion exchange treatment based on a second ion exchange solution, and both the first and second ion exchange solutions contain lithium ions.
[0012] In one optional embodiment, the lithium ion concentration of the second ion exchange solution is greater than or equal to the lithium ion concentration of the first ion exchange solution.
[0013] In one optional embodiment, both the first ion exchange solution and the second ion exchange solution contain sodium ions and potassium ions, wherein, The potassium ion concentration of the first ion exchange solution is greater than that of the second ion exchange solution, and the sodium ion concentration of the first ion exchange solution is less than that of the second ion exchange solution.
[0014] In one optional embodiment, polishing the first surface of the coated glass after the first heat treatment includes: The first surface of the coated glass after the first heat treatment is polished to a first thickness, wherein the first thickness is greater than or equal to 0.005 mm and less than or equal to 0.01 mm.
[0015] In one optional embodiment, after obtaining the decoction glass, the method further includes: The first and second surfaces of the decoction glass are respectively subjected to fine polishing treatment to a second thickness, wherein the second thickness is greater than or equal to 0.001 mm and less than or equal to 0.003 mm.
[0016] Beneficial effects: This application provides a method for removing coating from coated glass. The method includes: providing coated glass, the coated glass including a first surface and a second surface disposed opposite to each other, the first surface having a coating layer and the second surface having an ink layer; performing an ink removal process and a first heat treatment on the coated glass, wherein the first heat treatment is used to change the stress state of the coated glass, causing the coated glass to bend in a direction away from the second surface; polishing the first surface of the coated glass after the first heat treatment to remove the coating layer; and performing a second heat treatment on the coated glass with the coating layer removed to obtain coated glass with the coating layer removed, wherein the second heat treatment is used to adjust the stress state of the coated glass with the coating layer removed, so that the surface of the coated glass with the coating layer removed is restored to flatness. This application embodiment uses the first heat treatment to bend the coated glass in a direction away from the second surface, thereby avoiding surface warping of the coated glass during the coating layer removal process, and uses the second heat treatment to restore the surface of the coated glass to flatness, thereby effectively removing the coating layer while maintaining the flatness and surface quality of the glass substrate.
[0017] The above description is merely an overview of the technical solution disclosed herein. In order to better understand the technical means of this disclosure and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this disclosure more apparent and understandable, specific embodiments of this disclosure are described below. Attached Figure Description
[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0019] Figure 1 This is a schematic flowchart of a method for removing the coating from coated glass according to an embodiment of this application; Figure 2 This is a schematic diagram of a structure in which the surface of a coated glass is in a flat state according to an embodiment of this application; Figure 3 This is a schematic diagram of a coated glass surface with an outwardly convex and curved shape, according to an embodiment of this application.
[0020] Explanation of reference numerals in the attached drawings: 10, coated glass; 11, first side; 12, second side. Detailed Implementation
[0021] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.
[0022] It should be understood that when a layer or element is referred to as being on another layer or substrate, it can mean that the layer or element is directly on the other layer or substrate, or that there is an intermediate layer between the layer or element and the other layer or substrate.
[0023] Coated glass (such as ultra-hard anti-reflective coated glass) is widely used in consumer electronics, display devices, and other fields. During the production process or after a product is scrapped, in order to repair defective products or recycle substrate glass, it is necessary to effectively remove the coating layer on the glass surface, and it is essential to ensure that the surface quality, flatness, and mechanical strength of the glass after coating removal meet the requirements for reprocessing or reuse.
[0024] In existing technologies, the typical overall process for removing the coating layer is usually as follows: first, ink removal is performed; then, the core coating removal process is executed; next, tempering is performed to restore or enhance strength; and finally, re-polishing is performed to optimize the surface appearance. Currently, the core coating removal process mainly has the following three technical solutions: Strong acid stripping method: Strong acid solutions such as hydrofluoric acid (HF) and nitric acid (HNO3) are usually used to immerse the coated glass at room temperature for 20 to 60 minutes to remove the superhard coating layer by using the corrosive properties of the strong acid.
[0025] Strong alkali stripping method: Strong alkali solutions such as sodium hydroxide (NaOH) and potassium hydroxide (KOH) are usually used to immerse the coated glass in high temperature (about 100°C) for a long time for 5 to 10 hours. The ultra-hard coating layer is removed by the corrosion of the strong alkali.
[0026] Mechanical polishing method: Using polishing brushes made of materials such as polyurethane, carpet, nylon filaments, or white abrasive leather, the coated surface of the glass is directly polished by mechanical grinding to remove 0.005 mm to 0.01 mm of surface layer thickness, thereby removing the coating layer.
[0027] However, the aforementioned existing technologies all have obvious drawbacks, resulting in poor glass quality and low yield after film removal: First, while strong acid stripping is highly efficient, it's difficult to selectively avoid simultaneously eroding the non-coated surfaces and edges of the glass while the acid corrodes the coating. This results in uneven thinning of the glass and warping, severely impacting its dimensional stability and subsequent performance.
[0028] Secondly, although the strong alkali stripping method can remove the coating, the coating layer does not peel off evenly during the long-term corrosion process, which will cause a large number of corrosion-like indentations on the coating surface, resulting in roughening of the glass surface and seriously affecting the appearance quality and optical performance.
[0029] Finally, mechanical polishing, which directly removes the surface material, drastically alters the stress balance on the glass surface, leading to severe and irreversible warping deformation. This deformation cannot be effectively corrected by subsequent processes, resulting in product scrap and an extremely low yield.
[0030] In summary, existing film removal methods struggle to effectively remove the coating while maintaining the flatness and surface quality of the glass substrate. Therefore, there is an urgent need in the art for a novel and efficient film removal method for coated glass that can solve these problems.
[0031] In view of this, embodiments of this application propose a method for removing the coating from coated glass. Figure 1 This application provides a schematic flowchart of a method for removing the coating from coated glass according to an embodiment of the present application. Figure 1 As shown, the membrane removal method includes the following steps: S101. Provide coated glass, the coated glass including a first side and a second side disposed opposite to each other, the first side being provided with a coating layer and the second side being provided with an ink layer.
[0032] S102. The coated glass is subjected to ink removal treatment and a first heat treatment, wherein the first heat treatment is used to change the stress state of the coated glass, causing the coated glass to bend in a direction away from the second surface.
[0033] S103. Polish the first surface of the coated glass after the first heat treatment to remove the coating layer.
[0034] S104. The coated glass with the coating layer removed is subjected to a second heat treatment to obtain a decoated glass, wherein the second heat treatment is used to adjust the stress state of the coated glass with the coating layer removed so that the surface of the coated glass with the coating layer removed is restored to flatness.
[0035] When implementing specific step S101, Figure 2 This invention provides a schematic diagram illustrating a structure in which the surface of a coated glass is in a flat state, according to an embodiment of this application. Figure 2 As shown, the coated glass 10 includes a first surface 11 and a second surface 12 disposed opposite to each other. The first surface 11 is provided with a coating layer, and the second surface is provided with an ink layer 12.
[0036] In this embodiment, the main function of the coating layer is to improve the optical performance of the glass. For example, the coating layer can be an anti-reflective (anti-reflective) film to reduce surface reflectivity and increase light transmittance; or, the coating layer can be an anti-fingerprint film for easy cleaning. Optionally, the coating layer can be a coating structure composed of metal oxides such as silicon dioxide and titanium dioxide, which has the characteristics of high hardness and high wear resistance.
[0037] In this embodiment, the second surface 12 is provided with the ink layer. The ink layer is typically black or dark ceramic ink, and it is used to achieve optical shielding, preventing internal components or adhesives from being seen, thus improving the product's aesthetics; and / or, the ink layer is also used to print specific logos or patterns. It is readily understood that, in the solution of this embodiment, the ink layer is a structure that needs to be removed before the coating layer.
[0038] In specific implementation step S102, the second surface of the coated glass 10 is treated with a deinking solution to remove the ink layer from the second surface of the coated glass 10. In a specific embodiment, the coated glass 10 is completely immersed in a deinking solution heated to a specific temperature. Key process parameters are controlled as follows: the immersion temperature must be maintained within the range of 80°C to 100°C. If the temperature is too low, the reaction rate will be too slow, resulting in low removal efficiency; if the temperature is too high, it may lead to excessive evaporation of the solution or potential damage to the glass substrate. The immersion time must be controlled between 5 minutes and 20 minutes. This time window is sufficient to ensure that the ink layer is sufficiently softened, peeled off, and detached from the glass surface, while avoiding unnecessary corrosion of the glass surface due to prolonged immersion. After this process, the ink layer is effectively removed, resulting in a clean second surface 12, which is ready for subsequent stress adjustment treatment.
[0039] In one optional embodiment, after removing the ink layer, the de-inked coated glass 10 undergoes a first heat treatment. The first heat treatment is an ion exchange treatment, the specific process of which includes immersing the coated glass 10 in a first ion exchange solution, causing the ions in the glass to undergo a displacement reaction with the ions in the exchange solution, thereby forming a specific stress distribution inside the glass, so that the compressive stress of the second surface 12 is less than the compressive stress of the first surface 11.
[0040] In one specific embodiment, the first ion exchange solution is a high-temperature molten salt, whose composition, by mass fraction, includes: 80% to 95% potassium nitrate (KNO3), 1% to 10% sodium nitrate (NaNO3), and 1% to 10% lithium nitrate (LiNO3). The coated glass 10 is completely immersed in this first ion exchange solution, with the key process parameters controlled as follows: the immersion temperature must be maintained within the range of 400°C to 500°C, and the immersion time must be controlled between 10 minutes and 120 minutes. Under these conditions, the lithium ions (LiNO3) in the exchange solution... + Due to its small ionic radius and high migration activity, it preferentially binds to sodium ions (Na+) in the surface network of the coated glass. + () Displacement occurs. Figure 3 This illustration shows a schematic diagram of a coated glass surface with an outwardly convex and curved shape, according to an embodiment of this application. Figure 3 As shown, the mechanism of this deformation is as follows: For the second surface 12, since the ink layer has been removed, the glass surface is directly exposed to the exchange solution, and the sodium ions on its surface can be largely replaced by lithium ions. Because the radius of the incoming lithium ions is smaller than the radius of the replaced sodium ions, a compressive stress layer is formed on this surface, but the final surface compressive stress value is relatively low. For the first surface 11, the coating layer on its surface can effectively block the ion exchange reaction during the temperature and time of the first heat treatment, protecting the sodium ions on the underlying glass surface from being almost completely replaced, thus maintaining a high original surface compressive stress. Finally, because the compressive stress of the first surface 11 is significantly greater than that of the second surface 12, this stress difference (i.e., stress gradient) across the glass cross section drives the coated glass 10 to bend in a direction away from the second surface 12, forming a stable convex shape.
[0041] In this embodiment, the first heat treatment actively and controllably pre-shapes the coated glass 10 into a convex, curved shape before the coating layer is removed. This pre-deformation cleverly counteracts the opposite stress that may be introduced during subsequent polishing to remove the coating layer, thereby fundamentally avoiding the warping problem of the final product and ensuring that the flatness and surface quality of the glass substrate are well maintained while efficiently removing the coating.
[0042] In some optional embodiments, for the coated glass 10 after the first heat treatment, the surface compressive stress of the second surface 12 is greater than or equal to 80 MPa and less than or equal to 120 MPa; for the coated glass 10 after the first heat treatment, the surface compressive stress of the first surface 11 is greater than or equal to 160 MPa and less than or equal to 200 MPa. For example, for the coated glass 10 after the first heat treatment, the surface compressive stress of the second surface 12 is approximately 100 MPa, and the surface compressive stress of the first surface 11 is approximately 180 MPa.
[0043] In some optional embodiments, after the first heat treatment, the coated glass 10 is convex and curved, with the height difference between its center and edge in the normal direction being greater than or equal to 0.8 mm and less than or equal to 1 mm.
[0044] In specific implementation step S103, the first surface 11 of the coated glass 10 after the first heat treatment is polished to a first thickness, wherein the first thickness is greater than or equal to 0.005 mm and less than or equal to 0.01 mm. Optionally, the polishing process can be performed using a polishing brush (the material of the polishing brush can be polyurethane, carpet, nylon filament, white frosted leather, etc.). Through the polishing process, the coating layer on the first surface 11 is removed, and since the coated glass 10 forms an outwardly convex curved shape after the first heat treatment, the opposite stress introduced during polishing to remove the coating layer is effectively counteracted, thus avoiding the warping problem of the final product and ensuring that the flatness and surface quality of the glass substrate are well maintained while efficiently removing the coating.
[0045] In specific implementation step S104, after removing the coating layer by polishing, the glass without coating undergoes a second heat treatment. This second heat treatment is also an ion exchange treatment, the purpose of which is to adjust the stress distribution inside the glass to eliminate the bending introduced by the first heat treatment and restore the glass's flat shape. The specific process of the second heat treatment includes immersing the coated glass 10 in a second ion exchange solution with a composition different from the first ion exchange solution, and then performing another ion exchange reaction.
[0046] In one specific embodiment, the second ion exchange solution is a high-temperature molten salt, whose composition by mass fraction includes: 80% to 99% sodium nitrate (NaNO3), 1% to 20% potassium nitrate (KNO3), and 0.03% to 0.3% lithium nitrate (LiNO3). The coated glass 10 is completely immersed in this second ion exchange solution, and the key process parameters are controlled as follows: the immersion temperature needs to be maintained in the range of 450°C to 500°C, and the immersion time needs to be controlled between 30 minutes and 180 minutes. Under these conditions, lithium ions in the exchange solution will continue to exchange with sodium ions on the glass surface. Since the coating layer on the first surface 11 of the glass has been completely removed at this time, its surface is directly exposed to the exchange solution, so that both the first surface 11 and the second surface 12 are simultaneously ready for ion exchange.
[0047] In some alternative embodiments, the second ion exchange solution contains lithium ions, and the lithium ion concentration of the second ion exchange solution is greater than or equal to the lithium ion concentration of the first ion exchange solution.
[0048] In some optional embodiments, the second ion exchange solution contains sodium ions and potassium ions, wherein the potassium ion concentration of the first ion exchange solution is greater than the potassium ion concentration of the second ion exchange solution, and the sodium ion concentration of the first ion exchange solution is less than the sodium ion concentration of the second ion exchange solution.
[0049] In this embodiment, by making the potassium ion concentration in the second ion exchange solution lower than that in the first ion exchange solution, the tendency for potassium ions to form excessive compressive stress on the glass surface (especially the first surface 11) during this treatment can be mitigated. Simultaneously, by making the lithium ion concentration in the second ion exchange solution greater than or equal to that in the first ion exchange solution, the replacement effect of lithium ions on sodium ions can be enhanced.
[0050] Because the second surface 12 has already formed a surface layer with relatively low compressive stress and a more "loose" structure during the first treatment, its ion exchange activity is higher. Therefore, under the same second heat treatment conditions, the ion replacement amount of the second surface 12 will be greater than that of the first surface 11. This differentiated replacement significantly enhances the newly formed compressive stress layer on the second surface 12, while the compressive stress growth on the first surface 11 is relatively moderate. With this trade-off, the huge stress difference that originally spanned the glass cross section is reduced or even eliminated, thereby reducing the bending amplitude of the coated glass 10 away from the second surface 12, and ultimately restoring it to a flat state.
[0051] In some alternative embodiments, after the second heat treatment, the height difference between the center and the edge of the resulting decoction glass in the normal direction can be controlled within the range of 0 mm to 0.2 mm, achieving an excellent planarization effect.
[0052] In some optional embodiments, to further improve surface quality, after obtaining the decoated glass, the method may further include a fine polishing step: polishing the first and second surfaces of the decoated glass respectively, with a thickness removal of 0.001 mm to 0.003 mm on each side. This step is mainly used to remove surface microcracks and attached dirt that may have occurred after the glass under high-temperature ion exchange. Because the amount removed is extremely small, it will not disrupt the established stress balance and flattening morphology, ultimately resulting in a high-quality, uncoated, and flat glass product.
[0053] This application provides a method for removing coating from coated glass. The method includes: providing coated glass, the coated glass including a first surface and a second surface disposed opposite to each other, the first surface having a coating layer and the second surface having an ink layer; performing an ink removal process and a first heat treatment on the coated glass, wherein the first heat treatment is used to change the stress state of the coated glass, causing the coated glass to bend in a direction away from the second surface; polishing the first surface of the coated glass after the first heat treatment to remove the coating layer; and performing a second heat treatment on the coated glass with the coating layer removed to obtain coated glass with the coating layer removed, wherein the second heat treatment is used to adjust the stress state of the coated glass with the coating layer removed, so that the surface of the coated glass with the coating layer removed is restored to flatness. This application embodiment uses the first heat treatment to bend the coated glass in a direction away from the second surface, thereby avoiding surface warping of the coated glass during the coating layer removal process, and uses the second heat treatment to restore the surface of the coated glass to flatness, thereby effectively removing the coating layer while maintaining the flatness and surface quality of the glass substrate.
[0054] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.
[0055] In the description of this specification, it should be understood that the terms "center," "thickness," "upper," "lower," "front," "rear," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this disclosure and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure.
[0056] In this disclosure, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.
[0057] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0058] The foregoing application provides many different implementations or examples for carrying out different structures of this disclosure. To simplify this disclosure, the components and arrangements of specific examples are described above. Of course, these are merely examples and are not intended to limit this disclosure. Furthermore, reference numerals and / or reference letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various implementations and / or arrangements discussed.
[0059] The terms "an embodiment," "embodiment," or "one or more embodiments" as used herein mean that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment of this disclosure. Furthermore, please note that the examples of the phrase "in one embodiment" do not necessarily all refer to the same embodiment.
[0060] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of this disclosure may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.
[0061] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes said element.
[0062] The above provides a detailed description of a method for removing the coating from coated glass. Specific examples have been used to illustrate the principles and implementation methods of this disclosure. The descriptions of the above embodiments are only for the purpose of helping to understand the method and its core ideas. At the same time, those skilled in the art will recognize that there will be changes in the specific implementation methods and application scope based on the ideas of this disclosure. Therefore, the content of this specification should not be construed as a limitation of this disclosure.
Claims
1. A method for removing the coating from coated glass, characterized in that, The membrane removal method includes: A coated glass is provided, the coated glass including a first side and a second side disposed opposite to each other, the first side being provided with a coating layer and the second side being provided with an ink layer; The coated glass is subjected to ink removal treatment and a first heat treatment, wherein the first heat treatment is used to change the stress state of the coated glass, causing the coated glass to bend in a direction away from the second surface. The first surface of the coated glass after the first heat treatment is polished to remove the coating layer. The coated glass with the coating layer removed is subjected to a second heat treatment to obtain coated glass without coating. The second heat treatment is used to adjust the stress state of the coated glass with the coating layer removed so that the surface of the coated glass with the coating layer removed is restored to flatness.
2. The method for removing the coating from coated glass according to claim 1, characterized in that, The first heat treatment is an ion exchange treatment, and the first heat treatment of the coated glass includes: The coated glass is immersed in a first ion exchange solution, causing the ions in the coated glass to undergo a displacement reaction with the ions in the first ion exchange solution, thereby making the compressive stress on the second surface greater than that on the first surface.
3. The method for removing the coating from coated glass according to claim 1, characterized in that, For the coated glass after the first heat treatment, the surface compressive stress of the second surface is greater than or equal to 80 MPa and less than or equal to 120 MPa; For the coated glass after the first heat treatment, the surface compressive stress of the first surface is greater than or equal to 160 MPa and less than or equal to 200 MPa.
4. The method for removing the coating from coated glass according to claim 1, characterized in that, After the first heat treatment, the coated glass is convex and curved, and the height difference between its center and edge in the normal direction is greater than or equal to 0.8 mm and less than or equal to 1 mm.
5. The method for removing the coating from coated glass according to claim 1, characterized in that, The second heat treatment is an ion exchange treatment. The second heat treatment of the coated glass to remove the coating layer includes: The glass after the coating layer is removed is immersed in a second ion exchange solution, so that both the first and second surfaces of the glass after the coating layer is removed undergo ion exchange with ions in the second ion exchange solution, and the amount of ion exchange on the first surface is controlled to be less than that on the second surface.
6. The method for removing the coating from coated glass according to claim 1, characterized in that, The first heat treatment includes an ion exchange treatment based on a first ion exchange solution, and the second heat treatment includes an ion exchange treatment based on a second ion exchange solution, wherein both the first ion exchange solution and the second ion exchange solution contain lithium ions.
7. The method for removing the coating from coated glass according to claim 6, characterized in that, The lithium ion concentration of the second ion exchange solution is greater than or equal to the lithium ion concentration of the first ion exchange solution.
8. The method for removing the coating from coated glass according to claim 6, characterized in that, Both the first and second ion exchange solutions contain sodium and potassium ions, wherein, The potassium ion concentration of the first ion exchange solution is greater than that of the second ion exchange solution, and the sodium ion concentration of the first ion exchange solution is less than that of the second ion exchange solution.
9. The method for removing the coating from coated glass according to claim 1, characterized in that, The polishing process of the first surface of the coated glass after the first heat treatment includes: The first surface of the coated glass after the first heat treatment is polished to a first thickness, wherein the first thickness is greater than or equal to 0.005 mm and less than or equal to 0.01 mm.
10. The method for removing the coating from coated glass according to claim 1, characterized in that, After obtaining the removed glass, the method further includes: The first and second surfaces of the decoction glass are respectively subjected to fine polishing treatment to a second thickness, wherein the second thickness is greater than or equal to 0.001 mm and less than or equal to 0.003 mm.