Local repairing method of glass cover plate

Abstract

The invention discloses a local repairing method of a glass cover plate, and relates to the field of glass polishing, and the local repairing method comprises the following steps: S1, detecting the glass cover plate, and determining a scratch area and a scratch type; s2, if the scratches are local shallow scratches, polishing liquid is smeared on the scratched areas; the polishing solution is prepared from any one of the following components: 1, red ground powder, white ground powder and water in a ratio of 3: 1: 6; 2, the ratio of red ground powder to windshield washer fluid is 3: 2; and S3, a pneumatic polishing gun is used for conducting local polishing on the scratch area smeared with the polishing solution till the scratch disappears. According to the scheme, original whole-surface polishing and grinding are replaced by local polishing and grinding, the originally needed working procedure of fading the ink layer or the AF layer is omitted, only small damage is caused to the stress layer due to the fact that the polishing removal part is small, the stress layer does not need to be reprocessed after polishing, and the production cost is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of glass polishing, in particular to a local repair method of glass cover plate. BACKGROUND

[0002] The general process of glass cover plate production process generally involves: cutting → CNC → forming → grinding machine → hardening → printing → coating → packaging inspection → product delivery, wherein printing is to add an ink layer to the glass cover plate, and according to product requirements, the ink is located at the glass edge width of about 2mm, and coating is to add an AF layer to the user surface of the glass cover plate. During processing, there is a high risk of scratching the glass product, and the grinding machine process is mainly used to polish and repair the scratches, mold marks and concave-convex points on the surface of the product, so scratches before the grinding machine process do not need to be specially picked out for rework, and scratches after the grinding machine process need to be polished again. However, because the glass cover plate has an ink layer and an AF layer after polishing by the grinding machine, the ink and AF layer need to be removed according to the process of the scratch, and then the grinding machine is used for whole surface re-polishing. Because the whole surface polishing of the grinding machine will damage the stress layer, it is also necessary to re-harden (re-add stress layer) and re-print and coat, that is, the rework process is: ink / AF removal → double-sided re-grinding → appearance inspection → re-hardening → printing → AF coating → packaging inspection. However, for shallow scratches involving a small area and not involving an ink layer, this whole surface polishing method makes the process too complex, the cost is high, and it is not conducive to rapid production.

[0003] Therefore, it is necessary to provide a local repair method of glass cover plate to solve the above problems. SUMMARY

[0004] To achieve the above purpose, the present application provides the following technical scheme: a local repair method of glass cover plate, which is suitable for repairing shallow scratches involving a small area on the glass cover plate, and characterized by comprising: S1, detecting the glass cover plate to determine the scratch area and the scratch type; S2, if it is a local shallow scratch, applying polishing liquid to the scratch area; the composition of the polishing liquid is any one of the following: (1) red grinding powder: white grinding powder: water = 3:1:6; (2) red grinding powder: glass water = 3:2; S3, using a pneumatic polishing gun to locally polish the scratch area with polishing liquid until the scratch disappears.

[0005] Further, as a preferred, the scratch has a depth of less than 2um, a length of less than 3cm, and a width of 0.05-0.3mm.

[0006] Further, as preferred, in the step S1, the specific method for detecting the glass cover plate is: under the illumination of 1200LUX, the glass cover plate is inclined 45° with the horizontal plane, and then visual detection is performed.

[0007] Further, as preferred, the pneumatic polishing gun is provided with red polishing powder with a diameter of 1-4cm.

[0008] Further, as preferred, the component ratio of the red polishing powder is: CeO2 60%-70%, La2O3 30%-40%, F 4-7%; and the component ratio of the white polishing powder is: CeO2 62%-70%, La2O3 30%-38%, F 5%.

[0009] Further, as preferred, the main component ratio of the red polishing powder is: CeO2:La2O3:Pr6O11=64%:35%:1%, and the main component ratio of the white polishing powder is: CeO2:La2O3:F=62%-70%:30%-38%:5%.

[0010] Further, as preferred, the main components of the glass water include: PH adjuster, dispersing agent, corrosion inhibitor and surfactant.

[0011] Further, as preferred, after the step S3, the method further comprises: if the local polishing area is on the user surface of the glass cover plate, the area after local polishing is electroplated with an AF layer.

[0012] Further, as preferred, after the step S3, the method further comprises: if the local polishing area is on the user surface of the glass cover plate, the user surface is electroplated with an AF layer. Further, as preferred, in the step S4, a new AF layer can be plated to cover the glass layer.

[0013] Compared with the prior art, the method for locally repairing the glass cover plate has the following beneficial effects: The method for locally repairing the glass cover plate provided by the application has the following beneficial effects: BRIEF DESCRIPTION OF DRAWINGS

[0014] Fig. 1 A flow chart of a local repairing method of a glass cover plate; Fig. 2 A structure diagram of a glass cover plate suitable for a local repairing method of the glass cover plate.

[0015] In the figure: 1, AF layer; 2, glass layer; 3, ink layer. DETAILED DESCRIPTION

[0016] In order to make the above objectives, characteristics and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, a large number of specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be implemented in many different ways other than those described herein, and those skilled in the art can make similar improvements without departing from the scope of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0017] Please refer to Figs. 1-2 In an embodiment of the present application, a local repairing method of a glass cover plate is suitable for repairing a shallow scratch involving a small area on the glass cover plate, and the method is characterized by comprising the following steps. S1, detecting the glass cover plate to determine the scratch area and the scratch type; S2, if it is a local shallow scratch, applying polishing liquid to the scratch area; the composition of the polishing liquid is any one of the following: (1) red polishing powder: white polishing powder: water = 3:1:6; (2) red polishing powder: glass water = 3:2; S3, using a pneumatic polishing gun to locally polish the scratch area with polishing liquid until the scratch disappears.

[0018] Among them, the shallow scratch suitable for the present application specifically refers to a scratch with a depth of less than 2um, a length of less than 3cm, and a width of 0.05-0.3mm. In step S1, the scratch needs to be checked under the illumination of 1200LUX, with the glass cover plate inclined at 45° to the horizontal plane, and then visually detected. As a preferred embodiment, in a mobile phone glass panel, the scratch can be a dot or a line, but the scratch is too small to be removed in the scratch plate, and the scratch is too large to be removed, the scratch depth is within 2um, the length is within 3cm, and the width is 0.05-0.3mm. At the same time, it is necessary to determine the layer level of the scratch area, such as the AF layer side or the ink layer side or both sides.

[0019] As Fig. 2The structure of the glass cover plate to which the local repairing method of the glass cover plate is applicable is shown, wherein the AF layer and the ink layer are respectively located on the opposite surfaces of the glass layer. Generally, the AF layer is formed by electroplating, the ink layer is formed by silk printing, and the ink layer only exists within 2mm of the edge of the glass layer. It should be noted that because the prior art cannot realize local ink fading and then printing ink without color difference, but can locally or integrally electroplate the AF layer, when the scratch area involves the side of the ink layer, it is necessary to determine whether the local polishing needs to polish the ink area. If the scratch involves the ink area, the ink layer needs to be removed as a whole before polishing.

[0020] In some embodiments of the present application, the polishing liquid comprises red polishing powder, white polishing powder and water in a ratio of 3:1:6, wherein the red polishing powder comprises cerium oxide (CeO2) 60%-70%, lanthanum oxide (La2O3) 30%-40% and fluorine (F) 4-7%, and the white polishing powder comprises cerium oxide (CeO2) 62%-70%, lanthanum oxide (La2O3) 30%-38% and fluorine (F) 5%. In the polishing liquid, cerium oxide (CeO2) acts as a polishing material and a catalyst, lanthanum oxide (La2O3) is chemically active and acts as an additive or a composite component, and fluorine ion (F-) has strong chemical activity and can chemically react with the main component of the polished material, i.e. silicon dioxide SiO2 of the glass, to generate a reaction layer which is softer and easier to be mechanically removed.

[0021] In some other embodiments of the present application, the polishing liquid comprises red polishing powder, white polishing powder and water in a ratio of 3:1:6, wherein the red polishing powder comprises cerium oxide (CeO2), lanthanum oxide (La2O3) and praseodymium oxide (Pr6O 11 ) in a ratio of 64%:35%:1%, and the white polishing powder mainly comprises cerium oxide (CeO2), lanthanum oxide (La2O3) and fluorine (F) in a ratio of 62%-70%:30%-38%:5%. The functions of cerium oxide (CeO2), lanthanum oxide (La2O3) and fluorine (F) are the same as in the above-mentioned embodiments, and praseodymium oxide (Pr6O 11 ) as a polishing agent has a hardness smaller than glass, a smaller grinding amount, and can react with the main component of the polished material, i.e. silicon dioxide SiO2 of the glass, to generate a reaction layer which is easily dissolved in water or easily removed mechanically.

[0022] In some embodiments of the present application, the composition of the polishing liquid is red polishing powder: glass water = 3:2, wherein: the composition of the red polishing powder is: cerium oxide (CeO2) is greater than 60%, lanthanum oxide (La2O3) is greater than 30%, and fluorine (F) is 4-7%; the main components of the glass water are PH adjuster, dispersant, corrosion inhibitor and surfactant. Among them, the PH adjuster is used to determine the direction of chemical reaction, when in acidic environment (pH 4-6), organic acids such as citric acid and oxalic acid are added to inhibit the excessive hydrolysis of glass, reduce surface corrosion pits, and are suitable for fine polishing; when in alkaline environment (pH 8-10), ammonia, KOH and the like are added to accelerate the hydrolysis of glass surface (SiO2+2H2O→Si(OH)4), improve the material removal rate, and are suitable for rough polishing. The dispersant (such as sodium polyacrylate, PEG) is used to prevent the agglomeration of polishing powder, reduce scratches, and improve surface uniformity. The corrosion inhibitor, such as BTA benzotriazole, is used to protect metal ions in glass, such as Na⁺ in soda-lime glass, from being excessively dissolved out, and to avoid pitting. The surfactant is used to reduce the surface tension of the liquid, enhance the wettability of the glass micro-pores / grooves, and remove invisible dirt.

[0023] In the above three groups of embodiments, the physical indicators of the red polishing powder are D 10 : 0.4-0.7 μm, D50: 0.8-1.8 μm, D max : less than 15.56 μm, and the physical indicators of the white polishing powder are D 50 : 1.0±0.2 μm, D 90 : less than 5.0 μm. The white polishing powder is smaller in particle size than the red polishing powder, and is more delicate. Because the red polishing powder has a larger grinding amount than the white polishing powder, the red polishing powder is usually used for rough polishing, and the white polishing powder is usually used for fine polishing. In step 2, when the composition of the polishing liquid is red polishing powder: white polishing powder: water = 3:1:6, small-area single-point polishing is performed during polishing. The mixture of red polishing powder with large particle size and white polishing powder with small particle size can effectively remove scratch marks. However, problems of polishing powder sedimentation and stratification may occur during use, and there is also a problem of insufficient heat dissipation performance of pure water. Therefore, during the repair process of the product, it is easy to heat, resulting in that some repaired products have excessive local grinding amount after subsequent electroplating of AF film layer, and there are color difference defects, i.e., whitening or blackening, under the light source lamp on the user's face.

[0024] When the composition of the polishing liquid is red polishing powder: glass water = 3:2, the dispersant in the glass water optimizes the problems of polishing powder sedimentation and stratification of the above polishing liquid. At the same time, because the glass water uses PH adjuster and corrosion inhibitor corresponding to the glass and polishing requirements, the time in the repair process is reduced, and the polishing amount in the repair is uniform, thereby solving the problem of easy heating during the repair process. Furthermore, the problem of color difference defect after subsequent electroplating of AF film layer is solved. However, the glass water needs to be replaced and adjusted according to the type of repaired product and repair requirements, such as the PH adjuster and corrosion inhibitor in the glass water need to be changed frequently.

[0025] It is found through the control experiment that when the polishing liquid is composed of red polishing powder, white polishing powder and water in a ratio of 3:1:6, the subsequent AF film plating has a color difference defect rate of 12% when the surface roughness Ra of the repaired polishing is 1.2 nm; and when the polishing liquid is composed of red polishing powder and glass water in a ratio of 3:2, the color difference defect rate is less than 0.5% when the surface roughness Ra of the repaired polishing is 0.65 nm.

[0026] In the embodiment of the application, in step 3, the local polishing uses a pneumatic polishing gun, the pneumatic polishing gun is provided with a red polishing leather, the red polishing leather is a circular grinding sheet with a diameter of 1-4 cm, the main material is polyurethane, the Shore hardness is 80±5, and the thickness is about 3 mm, the rotation speed of the pneumatic polishing gun is 0-7500 rpm, and the red polishing leather is used in cooperation with the polishing liquid in step 2 to polish the scratch area on the glass panel. In the prior art, the equipment used for polishing is large equipment such as a grinding machine and a motor, which has high energy consumption and is inconvenient for personnel to operate, and it is basically difficult to achieve local processing effect. The pneumatic polishing gun in the embodiment of the application can be held by one hand of an operator, and the index finger can be used to start and stop the gun, so that the gun can be started and stopped at any time, and the operation is simple. The minimum polishing area is related to the point polishing gun head, the point polishing gun head contains an easy-to-tear patch and a black gasket, the easy-to-tear patch can be quickly replaced to bond the red polishing leather and the polishing gun, and the black gasket is between the easy-to-tear patch and the red polishing leather, which serves to buffer and reduce the hand holding reaction force and improve the service life of the point polishing gun. The pneumatic polishing gun has low energy consumption and high safety.

[0027] It should be noted that after step 3, if the AF layer 1 is polished and removed in the local polishing in step 3, the area where the AF layer 1 is polished and removed needs to be electroplated to supplement the AF layer 1 after step 3. If the AF layer 1 is polished and removed to a large extent, the AF layer 1 can be supplemented by full-surface electroplating.

[0028] Specifically, the local polishing in step 3 involves three cases: local polishing of the user side, local polishing of the back side, and double-sided local polishing.

[0029] The local polishing of the user side refers to that when the scratch area is on the glass layer 2 close to the AF layer 1 or on the AF layer 1, the pneumatic polishing gun is used to polish and grind from the side of the AF layer 1 until the scratch is polished smooth, and then the AF layer 1 polished and removed needs to be filled, which can be filled by partial electroplating AF or full-surface electroplating AF.

[0030] The local polishing of the back surface refers to: when the scratch area is on the glass layer 2 on the side close to the ink layer 3 or on the ink layer 3, the pneumatic polishing gun is used to polish the glass layer 3 from the side of the ink layer 3 until the scratch is polished smooth. Since the AF layer 1 is not damaged in the above process, it is not necessary to supplement the AF layer 1. Since the prior art cannot achieve the ink printed after the local polishing of the ink and the previous non-color difference, it is said that the local polishing is only performed on the area of the ink layer 3 where the scratch does not involve the part with the ink, that is, the transparent part of the glass panel, so it is not necessary to fill the ink layer 3. When the polishing involves the part with the ink, that is, the product edge 2mm, it is necessary to remove the ink on the entire ink layer 3.

[0031] The double-sided local polishing refers to: there are shallow scratches on the user side and the back side. At this time, the pneumatic polishing gun is used to polish the user side and the back side in turn. When the scratch area is on the AF layer 1 or on the glass layer 2 on the side close to the AF layer 1, only the AF layer 1 needs to be plated to supplement.

[0032] Example 1 In this embodiment, the glass panel is scratched after the film plating process in production, and the specific repair process is as follows: First, place the table lamp, polishing liquid, pneumatic polishing gun and cleaning tools on the workbench. When preparing the polishing liquid, use the measuring cup and weighing equipment to measure the abrasive powder according to the specified ratio, pour it into the abrasive powder barrel, add water and stir thoroughly, and continuously measure the number of 15 scales with a specific gravity meter. In the preparation of the pneumatic polishing gun, the red abrasive and black gasket are all glued together, and according to the needs, they are engraved into the required specifications. Before use, tear off the easy-to-tear sticker and stick the red abrasive on the head of the pneumatic polishing gun. Then, under the illumination of 1200LUX, the product is inclined at an angle of 45°, and the type and size of the scratch are confirmed by visual inspection. In this embodiment, the scratch has a depth of 1μm, a length of 2cm and a width of 0.1mm, and is a linear scratch. The scratch is on the side of the AF layer 1. Then, the repair personnel use a cotton swab to apply the prepared polishing liquid to the scratch area. The polishing liquid is red abrasive: glass water = 3:2, and the PH adjuster in the glass water makes the glass water acidic. Then, the repair personnel hold the pneumatic polishing gun with the right hand and the glass with the left hand, and make the red abrasive and the polishing liquid contact by sticking the glass scratch position with the pneumatic polishing gun. Adjust the speed, press the switch with the index finger to start the polishing gun, and keep polishing for 10-15s. Then, take the polishing gun to avoid high temperature, wipe it clean with cleaning tools, and observe whether the scratch disappears. If it still does not disappear, aim the polishing gun at the scratch area again and polish it. Repeat the operation until the scratch disappears. Then, use the flat machine to clean the polished glass with glass water, and finally plate the AF layer on the polished area to complete the repair of the glass panel.

[0033] Example 2 In this embodiment, the glass panel is scratched after coating in production, and the specific repair process is as follows: First, as in Example 1, the material preparation is carried out, wherein when the polishing liquid is configured, a clean ink mixer is used for stirring, the product is inclined at 45° under 1200LUX light, and the type and size of the scratch are confirmed by visual inspection. In this embodiment, the scratch depth is 2μm, the length is 2cm, the width is 0.2mm, and the scratch is linear. The scratch is on the side of the AF layer 1, and there are multiple groups of scratches in an area. The repair personnel use a cotton swab to apply the prepared polishing liquid to the scratch area. The polishing liquid is red polishing powder: glass water = 3:2, and the PH adjuster in the glass water makes the glass water alkaline. Then, the repair personnel hold the glass with the left hand and hold the pneumatic point polishing gun with the right hand. Adjust the speed, press the switch with the index finger to start the polishing gun, and keep polishing for 10-15s. Then, pick up the polishing gun to avoid high temperature, wipe clean with a cleaning tool, and observe whether the scratch disappears. If it still does not disappear, aim the polishing gun at the scratch area again and polish. Repeat the operation multiple times until the scratch disappears. Then, move to the next group of scratch areas until the glass surface scratches are completely repaired. Then, clean the polished and repaired glass with a flat machine and glass water. Finally, electroplate the AF layer on the user side of the glass to complete the repair of the glass panel.

[0034] Example Three In this embodiment, the glass panel is scratched after coating in production, and the specific repair process is as follows: First, as in Example 1 or 2, the material preparation is carried out, and the product is inclined at 45° under 1200LUX light. The type and size of the scratch are confirmed by visual inspection. In this embodiment, the scratch depth is 2μm, the length is 2cm, the width is 0.2mm, and the scratch is linear. The scratch is on the side of the ink layer 3, and is located at the center of the glass panel. The repair personnel use a cotton swab to apply the prepared polishing liquid to the scratch area. The polishing liquid is red polishing powder: white polishing powder: water = 3:1:6, and the ratio of red polishing powder is cerium oxide (CeO2): lanthanum oxide (La2O3): praseodymium oxide (Pr6O 11) = 64%: 35%: 1%, the main component ratio of white polishing powder is cerium oxide (CeO2): lanthanum oxide (La2O3): fluorine (F) = 62%-70%: 30%-38%: 5%. Then, the repairer holds the glass with the left hand and holds the pneumatic point polishing gun with the right hand, and the red polishing skin and the polishing liquid are in contact with the glass scratch position, the speed is adjusted, the index finger is pressed on the switch to start the polishing gun, the polishing gun is held for 10-15s to avoid high temperature, and the glass is cleaned with a cleaning tool, and at the same time, whether the scratch disappears is observed, if the scratch still does not disappear, the polishing gun is aimed at the scratch area again, and the point polishing is performed, and the operation is repeated for several times until the scratch disappears. Finally, the repaired glass is cleaned by a dust-free cloth with alcohol or a flat machine with glass water to complete the repair of the glass panel.

[0035] In summary, when the glass panel surface scratch is on both sides, polishing of the AF layer 1 side needs to be performed after electroplating, and polishing of the ink layer 3 needs to be performed after cleaning, and when the polishing liquid for local polishing of the ink layer 3 is selected, the problem of color difference caused by subsequent processing does not need to be considered.

[0036] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be combined appropriately to form other embodiments that those skilled in the art can understand.

Claims

1. A method for local repair of a glass cover plate, suitable for repairing a shallow scratch on a glass cover plate involving a small area, characterized in that: The application relates to a method for repairing a glass cover plate. S1, detecting the glass cover plate to determine a scratch area and a scratch type; S2, if the scratch is a local shallow scratch, polishing liquid is applied to the scratch area; the polishing liquid comprises any one of the following components: (1) red polishing powder: white polishing powder: water = 3:1:6; (2) red polishing powder: glass water = 3:2; S3, using a pneumatic polishing gun to polish the scratch area with the polishing liquid until the scratch disappears.

2. The method of claim 1, wherein the glass cover plate is a cover plate for a display device. The local shallow scratch refers to a scratch with a depth less than 2 um, a length less than 3 cm and a width of 0.05-0.3 mm.

3. The method of claim 1, wherein: In the step S1, the specific method for detecting the glass cover plate is as follows: the glass cover plate is inclined at an angle of 45 degrees with the horizontal plane under the illumination of 1200LUX, and then visual detection is carried out.

4. The method of claim 1, wherein: The pneumatic polishing gun is provided with red polishing leather with a diameter of 1-4 cm.

5. The method of claim 1, wherein: The component ratio of the red polishing powder is as follows: cerium oxide (CeO2) 60%-70%, lanthanum oxide (La2O3) 30%-40% and fluorine (F) 4-7%; the component ratio of the white polishing powder is as follows: cerium oxide (CeO2) 62%-70%, lanthanum oxide (La2O3) 30%-38% and fluorine (F) 5%.

6. The method of claim 1, wherein: The main component ratio of the red mill powder is cerium oxide (CeO2) : lanthanum oxide (La2O3) : praseodymium oxide (Pr6O 11 ) = 64%:35%:1%, and the main component ratio of the white mill powder is cerium oxide : lanthanum oxide : fluorine = 62%-70%:30%-38%:5%.

7. The method of claim 1, wherein: The main components of the glass water include a PH regulator, a dispersing agent, a corrosion inhibitor and a surfactant.

8. The method of claim 1, wherein: After the step S3, the method further comprises the following steps: if the local polishing area is on the user surface of the glass cover plate, an AF layer is electroplated on the local polishing area.

9. The method of claim 1, wherein: After the step S3, the method further comprises the following steps: if the local polishing area is on the user surface of the glass cover plate, an AF layer is electroplated on the user surface.

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