A method for processing laminated glass

Abstract

The application discloses a kind of laminated glass processing method, belong to glass manufacturing field, including the following steps: the scratch of glass surface before lamination is detected, if scratch does not penetrate glass and depth is within 0.3mm, then carry out repair processing, glass is roughly polished, middle polishing, fine polishing, after polishing glass is washed thoroughly, dry, then with another piece of no-loss glass middle PVB or SGP film is placed, is laminated, after laminating glass is sent into autoclave and is laminated processing.The application embodiment, by multistage polishing, eliminate scratch trace, scratch repair is complete, repair area transmittance, haze and periphery normal area difference is less than 3%, optical performance meets the standard, polishing transition is smooth, after lamination, it is not easy to appear bubble, delamination and other defects, structure is safe and reliable, the glass that is originally judged to be useless is reused, cost benefit is remarkable, can be used for toughened, semi-toughened and ordinary float glass before lamination repair, process adaptability is strong.

Description

Technical Field

[0001] This invention relates to the field of glass manufacturing technology, and in particular to a method for processing laminated glass. Background Technology

[0002] During the manufacturing process of laminated glass for building curtain walls, scratches of varying degrees often appear on the glass surface due to improper spacers, equipment contact, or human error during processes such as cutting, handling, edge grinding, drilling, and turnover. Although traditional glass polishing technology can be used to repair surface defects, it is mostly applicable to single-layer glass and requires high thickness uniformity. If it is used directly on the glass before lamination, it is easy to cause problems such as bubbles and optical distortion after lamination due to the concavity of the polished area, which cannot meet the requirements of light transmittance, haze, and safety performance of laminated glass. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a method for processing laminated glass.

[0004] A method for processing laminated glass according to an embodiment of the present invention includes the following steps: Step S1: Inspect the scratches on the surface of the glass before lamination to confirm their length, width and depth. If the scratches do not penetrate the glass and the depth is within 0.3mm, repair them; otherwise, scrap them. Step S2: Use a coarse grinding wheel with a grit range of 180-200 to roughly grind the glass; Step S3: Use a medium-fine grinding wheel with a grit range of 600-800 to perform medium polishing on the glass; Step S4: Use a fine grinding wheel with a grit range of 800-1500 to finely polish the glass; Step S5: Thoroughly clean and dry the polished glass, then place a PVB or SGP film between it and another piece of undamaged glass, and then assemble the glass. Step S6: The laminated glass is sent into an autoclave for lamination.

[0005] A method for processing laminated glass according to an embodiment of the present invention has at least the following beneficial effects: Thorough scratch repair: Scratches are eliminated through multi-stage polishing, and the original scratch location is visually unrecognizable after lamination.

[0006] Optical performance meets standards: The refractive indices of the glass, PVB (PolyVinyl Butyral) film, and SGP (SentryGlas Plus high-performance ionomer interlayer film) film are matched. After the molten film fills the polished area, the light transmittance and haze of the repaired area are less than 3% different from the surrounding normal area, which meets the optical performance requirements of architectural glass.

[0007] The structure is safe and reliable: the grinding transition is smooth, and defects such as bubbles and delamination are not likely to occur after lamination, which does not affect the overall strength and safety of the glass.

[0008] Significant cost-effectiveness: Reusing glass that would otherwise be scrapped increases yield and reduces material waste.

[0009] Highly adaptable to various processes: It is suitable for both PVB and SGP films and can be used for pre-laminated repair of tempered, semi-tempered, and ordinary float glass.

[0010] According to some embodiments of the present invention, in step S2, the coarse grinding wheel is a coarse-grained grinding wheel with a metal bond. During the grinding process, polishing fluid is sprayed on the surface of the coarse grinding wheel. The polishing fluid is a conventional water-based coolant with added lubricant and rust inhibitor.

[0011] According to some embodiments of the present invention, in step S3, the medium and fine grinding wheel is a resin-bonded grinding wheel. During the grinding process of the medium and fine grinding wheel, a polishing liquid is sprayed on the surface of the medium and fine grinding wheel. A composite abrasive is added to the polishing liquid. The composite abrasive includes 8-30 parts by weight of alumina and 9-32 parts by weight of cerium oxide, wherein the alumina particle size is 100-500 nm and the cerium oxide particle size is 600-1200 nm.

[0012] According to some embodiments of the present invention, in step S4, the glass is finely polished using a fine grinding wheel, and the surface roughness Ra value of the polished glass needs to be controlled within the range of 0.4μm-0.8μm.

[0013] According to some embodiments of the present invention, in step S4, during the fine grinding wheel grinding process, a polishing liquid needs to be sprayed on the surface of the fine grinding wheel. The components of the polishing liquid, by mass percentage, include: 2%-10% cerium oxide powder, 2%-5% dispersant, 3%-5% viscosity modifier, 0.06%-1.2% surfactant, 0.04%-1% pH adjuster, 0.05%-2% preservative, and the balance being deionized water.

[0014] According to some embodiments of the present invention, the cerium oxide has a particle size of 30-1000 nm, the dispersant is at least one of sodium polyacrylate, ammonium polyacrylate, acrylate polymer, sodium tripolyphosphate, and polyethylene glycol, the viscosity modifier is at least one of ethylene glycol, glycerol, and gelatin, the surfactant is sodium lauryl ether sulfate, polyacrylate, polypropylene ether, or fatty alcohol polyoxyethylene ether, the pH adjuster is dihydroxyethyl ethylenediamine, and the pH value is preferably controlled between 8 and 12.

[0015] According to some embodiments of the present invention, in step S4, during the fine grinding wheel polishing process, a polishing liquid is sprayed on the surface of the fine grinding wheel. The polishing liquid includes 249-251 parts of cerium oxide, 4416-4418 parts of water, and 332-334 parts of nano-silica or alumina. The pH value is adjusted to 5-11 using KOH.

[0016] According to some embodiments of the present invention, in step S4, polishing liquid needs to be sprayed on the surface of the fine grinding wheel during the fine grinding wheel grinding process. The polishing liquid uses pure cerium oxide polishing powder, which does not contain fluorine or has a fluorine content of less than 3%.

[0017] According to some embodiments of the present invention, in step S2, a coarse grinding wheel is used to perform a rough grinding process on the glass. The grinding is carried out at a uniform speed along the direction of the scratches, and the grinding depth does not exceed the maximum depth of the scratches until the linear scratches disappear. It is necessary to strictly control the grinding area and edge transition to grind out a smooth concave area with a slope ratio of 1:50.

[0018] According to some embodiments of the present invention, in steps S2, S3, and S4, during the entire polishing process, it is necessary to control the smooth transition between the polished area and the surrounding normal area, control the difference in polishing depth to be within 5% of the glass thickness, and ensure that the polishing depth does not exceed 0.3 mm.

[0019] Additional aspects and advantages of the invention will be set forth in part in the description which follows. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is a schematic diagram of scratched glass that needs to be processed using the laminated glass processing method of this embodiment of the invention; Figure 2 This is a schematic diagram of the coarse grinding process of glass in the laminated glass processing method of this invention. Figure 3 This is a schematic diagram of the intermediate grinding process of glass in the laminated glass processing method of this invention. Figure 4 This is a schematic diagram of the glass after fine polishing in the laminated glass processing method of this embodiment of the invention. Figure 5 This is a schematic diagram of the grinding wheel after spraying polishing liquid during the glass grinding process in the laminated glass processing method of this embodiment of the invention. Figure 6 This is a rendering of the laminated glass after polishing using the laminated glass processing method of this embodiment of the invention; Figure 7 This is a diagram showing the effect of laminating the film using the laminated glass processing method of this embodiment of the invention; Figure 8 The image shows the effect of the laminated glass processing method of this invention after being processed in an autoclave. Detailed Implementation

[0021] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0022] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not 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 the invention. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0023] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0024] A method for processing laminated glass according to an embodiment of the present invention includes the following steps: Step S1: Refer to Figure 1Before lamination, scratches on the glass surface are inspected to confirm their length, width, and depth. If the scratch does not penetrate the glass and its depth is within 0.3mm, it is repaired; otherwise, it is scrapped. Scratch depth can be divided into three levels: 1. Safely repairable zone: scratch depth ≤ 0.1mm; 2. Cautious repair zone: scratch depth approximately 0.1mm ~ 0.3mm; 3. High-risk / Unrepairable zone: depth > 0.4mm.

[0025] Safely repairable areas: typically hairline scratches and minor surface abrasions. A slight sensation may be felt when a fingernail is run across the surface, but there is no sticking. The amount removed by grinding is minimal, with negligible impact on the overall thickness and strength of the glass. The transition between the ground and normal areas is very easy to achieve (gentle slope), allowing for easy filling of the PVB melt during lamination without the risk of air bubbles. After repair, the optical performance and structural safety are almost identical to the original glass.

[0026] Careful Repair Area: Clearly visible to the naked eye, with a noticeable "click" when scratched with a fingernail. This is the most valuable and common treatment area in this application. Using the laminated glass treatment method of this application, scratches can be completely eliminated through fine three-stage polishing. A micro-concave area will be created after polishing. The polishing area and edge transition must be strictly controlled. The goal is to transform a "deep and narrow" scratch into a "shallow and wide" smooth concave area. For example, for a scratch with a depth of 0.2mm, the diameter of the polishing impact should reach more than 20mm, forming a gentle slope (a slope ratio of 1:50 is recommended). The maximum removal depth is approximately 0.3mm, accounting for 5% of the 6mm glass thickness. This is an important empirical critical point in engineering. Within this range, the bending strength and fragment retention capacity of the glass will not substantially decrease. Under the premise of strict adherence to the process (especially the smooth transition), the repair success rate is high, which is the main contributing area to improving the yield.

[0027] High-risk / Unrepairable area: Obvious groove-like scratches, the depth of which can even be determined with a thin sheet. Reasons why high-risk / unrepairable areas are unrepairable: 1. Geometric shape cannot be eliminated: To eliminate such deep scratches, a large amount of glass needs to be ground away, inevitably forming a noticeable local pit. No matter how much the grinding area is expanded, the glass thickness reduction at this point exceeds 10%, creating a structural weak point. 2. Extremely high risk of "bubbling back": The deep pit is like a "basin." In the autoclave, when PVB softens, flows, and is vented, the molten PVB flows from the periphery towards the center of the pit. The steep edges of the pit (even if they appear smooth to the naked eye, they are still steep on a microscopic flow scale) will hinder the smooth escape of gas. The gas is trapped at the bottom or edge of the pit, forming "bubbling back," i.e., round or elongated bubbles that appear after lamination. These bubbles cannot be eliminated by secondary pressurization. 3. Optical distortion: Excessive local thickness variation, even with proper filling, may produce a slight lens effect (optical distortion) due to uneven light refraction, visible at specific angles. Therefore, for scratches deeper than 0.4mm, it is recommended to reject the product. Attempts to repair them not only have a low success rate but also introduce potential quality risks and safety hazards (reduced strength).

[0028] Step S2: Refer to Figure 2 and Figure 5 The glass is coarsely polished using a coarse abrasive wheel with a grit range of 180-200 mesh. The purpose is to quickly remove the main body of the scratches and eliminate linear defects, while strictly controlling the polishing depth and edge transition, transforming "deep and narrow" scratches into "shallow and wide" smooth depressions. The 180-200 mesh abrasive grain size provides sufficient cutting force to ensure that scratches are effectively eliminated within a reasonable time, while also facilitating the formation of a gentle slope (preferably a slope ratio of 1:50) to avoid excessively deep local depressions.

[0029] Step S3: Refer to Figure 3 and Figure 5 Medium-fine grinding wheels with a grit range of 600-800 are used for medium polishing of the glass. A second polishing is then performed on the frosted areas after coarse polishing to refine the surface roughness and make the frosted texture smoother and more uniform. The 600-800 grit abrasive grains are finer than coarse polishing, eliminating deeper scratches left by coarse polishing and resulting in a more uniform and refined surface texture, preparing the surface for the subsequent fine polishing stage to reduce roughness.

[0030] Step S4: Refer to Figure 4 and Figure 5Fine grinding wheels with a grit range of 800-1500 mesh are used to polish the glass, further reducing surface roughness and giving the area a uniform, hazy appearance without noticeable graininess. If the roughness is too high (high Ra value), the film cannot completely fill the gaps, leaving behind tiny air bubbles (visible or invisible to the naked eye), affecting optics and strength. If the roughness is too low (close to a mirror finish), the improvement in film adhesion is limited, and the polishing efficiency is low.

[0031] Step S5: Thoroughly clean and dry the polished glass, then place a PVB or SGP film between it and another piece of undamaged glass, and then assemble the glass.

[0032] Step S6: The laminated glass is sent into an autoclave for lamination. The lamination process is carried out under high temperature and high pressure conditions; after the film softens due to heat, it fills the microstructure of the polished area, and after cooling and solidification, it forms a complete adhesive layer.

[0033] For scratched glass, three stages of polishing—coarse, medium, and fine—are performed before lamination to achieve a uniformly frosted surface. Then, the lamination process uses film to fill the surface microstructures under high temperature and pressure, ultimately restoring transparency. From an optical perspective, when the glass surface is roughened, light is scattered across the irregularities, resulting in a frosted appearance. However, when these tiny irregularities are filled with a material of matching refractive index, the light path becomes continuous, scattering decreases, and transparency is restored. From a material perspective, PVB or SGP film melts and flows under high temperature and pressure, filling the tiny depressions and pores on the glass surface. Because the refractive indices of the glass and film are very similar, when the interface is completely filled, light can pass through smoothly without significant reflection or scattering at the interface.

[0034] When a glass surface is roughened (polished), countless irregular, micron- or even nano-sized bumps, cracks, and pores are formed. When light shines on such a surface, it undergoes severe scattering at the air-glass interface (including diffuse reflection and disordered refraction directions). A large amount of light is scattered in all directions and cannot pass through in an orderly manner, so what the naked eye sees is a blurry, whitish, and opaque "fog" or "frosted" appearance. At this point, the interface is "air / rough glass".

[0035] Post-repair: The key steps are lamination and high-temperature, high-pressure treatment. PVB or SGP film is heated in an autoclave (typically 120-150°C) to soften to a molten, flowing state, and then extruded under high pressure (typically 1.1-1.4 MPa), completely wetting and filling all the microscopic depressions, cracks, and pores on the rough surface. After filling, the original rough "air-glass" interface is replaced by a smooth, perfectly bonded "film-glass" interface.

[0036] The refractive indices of the glass, PVB (Polyvinyl Butyral) film, and SGP (SentryGlas Plus) film are matched. The refractive index of glass is approximately 1.52, while that of PVB film is approximately 1.48-1.50, and that of SGP is also close. Their refractive indices are very similar. When refractive indices differ (e.g., air 1.0 vs. glass 1.52), light undergoes significant refraction and reflection at the interface (e.g., specular reflection, diffuse reflection). When the refractive indices are similar, the direction of light passing through the interface changes very little, and reflection and scattering losses are drastically reduced. Therefore, after the molten film is filled, light undergoes almost no scattering at the new "glass-film" interface, passing smoothly as if through a homogeneous medium, thus eliminating the visual "haze" and restoring transparency.

[0037] Thorough scratch repair: Scratches are eliminated through multi-stage polishing, and the original scratch location is visually unrecognizable after lamination.

[0038] Optical performance meets standards: After the molten film fills the polished area, the difference in light transmittance and haze between the repaired area and the surrounding normal area is less than 3%, which meets the optical performance requirements of architectural glass.

[0039] The structure is safe and reliable: the grinding transition is smooth, and defects such as bubbles and delamination are not likely to occur after lamination, which does not affect the overall strength and safety of the glass.

[0040] Significant cost-effectiveness: Reusing glass that would otherwise be scrapped increases yield and reduces material waste.

[0041] Highly adaptable to various processes: It is suitable for both PVB and SGP films and can be used for pre-laminated repair of tempered, semi-tempered, and ordinary float glass.

[0042] In some embodiments, in step S2, the coarse grinding wheel is a coarse-grit grinding wheel with a metal bond. During the coarse grinding process, polishing fluid is sprayed onto the surface of the coarse grinding wheel. The polishing fluid is a conventional water-based coolant with added lubricant and rust inhibitor. For example: 94-97% water, 3-6% water-based coolant additives (which may contain rust inhibitors, lubricants, etc.). The main purpose of the coarse grinding stage is to quickly remove the main body of the scratches. The grinding volume is large, so the polishing fluid must have good lubricity and cooling properties, and at the same time, be able to effectively remove grinding debris and prevent local overheating of the glass from causing new microcracks.

[0043] In some embodiments, in step S3, the medium-fine grinding wheel is a resin-bonded grinding wheel. During the grinding process, a polishing slurry is sprayed onto the surface of the medium-fine grinding wheel. The polishing slurry contains composite abrasive, comprising 8-30 parts by weight of alumina and 9-32 parts by weight of cerium oxide, wherein the alumina particle size is 100-500 nm and the cerium oxide particle size is 600-1200 nm. In the medium grinding stage, the surface roughness is further refined based on the coarse grinding, and the polishing slurry begins to play a more important role, requiring additional dispersion stability on top of lubrication.

[0044] In some embodiments, in step S4, the glass is finely polished using a fine grinding wheel, and the surface roughness Ra value of the polished glass needs to be controlled within the range of 0.4μm-0.8μm. This range ensures that the PVB / SGP film fully fills the micropores in the molten state, while providing sufficient microscopic "anchor points" for the film to enhance adhesion.

[0045] In some embodiments, during step S4, a polishing slurry is sprayed onto the surface of the fine grinding wheel during the grinding process. The polishing slurry comprises, by mass percentage: 2%-10% cerium oxide powder, 2%-5% dispersant, 3%-5% viscosity modifier, 0.06%-1.2% surfactant, 0.04%-1% pH adjuster, 0.05%-2% preservative, with the balance being deionized water. The fine grinding stage aims to achieve a uniform, fine, mist-like surface (Ra value 0.4~0.8μm) to prepare for the lamination process. The polishing slurry must possess excellent suspension and dispersibility, high purity, and good wettability to minimize surface micro-defects.

[0046] In some embodiments, the cerium oxide has a particle size of 30-1000 nm, the dispersant is at least one of sodium polyacrylate, ammonium polyacrylate, acrylate polymer, sodium tripolyphosphate, and polyethylene glycol, the viscosity modifier is at least one of ethylene glycol, glycerol, and gelatin, the surfactant is sodium lauryl ether sulfate, polyacrylate, polypropylene ether, or fatty alcohol polyoxyethylene ether, the pH adjuster is dihydroxyethyl ethylenediamine, and the pH value is preferably controlled between 8 and 12.

[0047] In some embodiments, during step S4, a polishing slurry is sprayed onto the surface of the fine grinding wheel during the grinding process. The polishing slurry comprises 249-251 parts of cerium oxide, 4416-4418 parts of water, 332-334 parts of nano-silica or alumina, and an appropriate amount of surfactant. The pH value is adjusted to 5-11 using KOH. The role of nano-silica / alumina is to buffer the scratches on the glass surface caused by hard cerium oxide particles, while simultaneously creating a resonance effect with cerium oxide to accelerate polishing efficiency and improve the suspension and rheological properties of the polishing slurry.

[0048] In some embodiments, during step S4, a polishing liquid is sprayed onto the surface of the fine grinding wheel during the grinding process. The polishing liquid uses pure cerium oxide polishing powder, which is free of fluorine or has a fluorine content of less than 3%. If pure cerium oxide polishing powder is used, it is advisable to select pure cerium oxide polishing powder with a high cerium content. The powder should have uniform particle size, high purity, good dispersibility, and regular particle shape (forming sharp corners when broken to improve polishing efficiency).

[0049] In some embodiments, in step S2, a coarse grinding wheel is used to perform a rough grinding process on the glass. Grinding is carried out at a uniform speed along the direction of the scratches, and the grinding depth does not exceed the maximum depth of the scratches until the linear scratches disappear. It is necessary to strictly control the grinding area and edge transition, and grind out a smooth concave area with a slope ratio of 1:50. The grinding transition is smooth, and there are no defects such as bubbles or delamination after lamination, which does not affect the overall strength and safety of the glass.

[0050] In some embodiments, during steps S2, S3, and S4, the transition between the polished area and the surrounding normal area must be controlled to be smooth throughout the polishing process. The difference in polishing depth should be controlled within 5% of the glass thickness, and the polishing depth should not exceed 0.3 mm. A smooth polishing transition ensures no defects such as bubbles or delamination after lamination, and does not affect the overall strength and safety of the glass.

[0051] Example 1: A linear scratch about 80mm long and 0.1mm deep appeared on the surface of a laminated glass (6mm glass + 1.52mm PVB + 6mm glass) used in a curtain wall after edge grinding.

[0052] 1) Use a 200-grit coarse grinding wheel to grind along the scratches at a uniform speed until the scratches disappear and the ground area has a frosted appearance.

[0053] 2) Replace with an 800-grit medium-fine grinding wheel for secondary polishing, resulting in a significantly finer surface texture.

[0054] 3) Then use a 1500-grit fine grinding wheel for fine polishing to obtain a uniform misty surface with a polishing depth difference ≤0.15mm.

[0055] After cleaning and drying, it is laminated with another 6mm glass sheet using PVB film and placed in an autoclave at 135℃ and 1.2MPa for 90 minutes.

[0056] After exiting the autoclave, the light transmittance of the repaired area was 88.5% (89.1% in the normal area), the haze was 1.8% (1.5% in the normal area), and there were no traces or bubbles on the surface.

[0057] Example 2: For SGP laminated glass, the scratch repair procedure is the same as in Example 1, except that the autoclave process parameters are adjusted to 145°C, 1.4 MPa, and held for 120 minutes. The repaired area exhibits the same optical properties as the normal area, meeting safety glass standards.

[0058] Example 3: See Figure 6 The laminated glass is divided into three areas. The left side shows surface #2 (the inner surface of the glass between the two original laminated glass panes, close to the middle PVB adhesive layer, which is not directly exposed to the outdoors) with scratches, and the effect after polishing. The middle area is without scratches, as shown in the comparison picture. The right side shows surface #1 (the exposed outer surface of the first glass pane facing the outdoors after the laminated glass is installed, which is the surface that directly contacts the outdoor environment) with scratches, and the effect after polishing.

[0059] The scratch repair steps are the same as in Example 1. Figure 7 This is a diagram showing the effect of laminating the film using the laminated glass processing method of this embodiment of the invention. Figure 8 The image shows the effect after laminar glass processing using the method described in this embodiment of the invention, after being processed in an autoclave. After repair, surface #2 has the same optical properties as the normal area and meets safety glass standards. Surface #1 is exposed and lacks molten film filling, resulting in a visually "foggy" appearance.

[0060] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0061] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A method for processing laminated glass, characterized in that, Includes the following steps: Step S1: Inspect the scratches on the surface of the glass before lamination to confirm their length, width and depth. If the scratches do not penetrate the glass and the depth is within 0.3mm, repair them; otherwise, scrap them. Step S2: Use a coarse grinding wheel with a grit range of 180-200 to roughly grind the glass; Step S3: Use a medium-fine grinding wheel with a grit range of 600-800 to perform medium polishing on the glass; Step S4: Use a fine grinding wheel with a grit range of 800-1500 to finely polish the glass; Step S5: Thoroughly clean and dry the polished glass, then place a PVB or SGP film between it and another piece of undamaged glass, and then assemble the glass. Step S6: The laminated glass is sent into an autoclave for lamination.

2. The method for processing laminated glass according to claim 1, characterized in that, In step S2, the coarse grinding wheel is a coarse-grit grinding wheel with a metal bond. During the grinding process, polishing fluid needs to be sprayed on the surface of the coarse grinding wheel. The polishing fluid is a conventional water-based coolant with added lubricant and rust inhibitor.

3. The method for processing laminated glass according to claim 1, characterized in that, In step S3, the medium and fine grinding wheels are resin-bonded grinding wheels. During the grinding process of the medium and fine grinding wheels, polishing liquid needs to be sprayed on the surface of the medium and fine grinding wheels. Composite abrasive is added to the polishing liquid. The composite abrasive includes 8-30 parts by weight of alumina and 9-32 parts by weight of cerium oxide, wherein the alumina particle size is 100-500nm and the cerium oxide particle size is 600-1200nm.

4. The method for processing laminated glass according to claim 1, characterized in that, In step S4, the glass is finely polished using a fine grinding wheel. The surface roughness Ra value of the polished glass needs to be controlled within the range of 0.4μm-0.8μm.

5. The method for processing laminated glass according to claim 1, characterized in that, In step S4, during the fine grinding wheel polishing process, polishing liquid needs to be sprayed on the surface of the fine grinding wheel. The components of the polishing liquid, by mass percentage, include: 2%-10% cerium oxide powder, 2%-5% dispersant, 3%-5% viscosity modifier, 0.06%-1.2% surfactant, 0.04%-1% pH adjuster, 0.05%-2% preservative, and the balance being deionized water.

6. The method for processing laminated glass according to claim 5, characterized in that, The particle size of cerium oxide is 30-1000nm. The dispersant is at least one of sodium polyacrylate, ammonium polyacrylate, acrylate polymer, sodium tripolyphosphate, and polyethylene glycol. The viscosity modifier is at least one of ethylene glycol, glycerol, and gelatin. The surfactant is sodium lauryl ether sulfate, polyacrylate, polypropylene ether, or fatty alcohol polyoxyethylene ether. The pH adjuster is dihydroxyethyl ethylenediamine. The pH value should be controlled between 8 and 12.

7. The method for processing laminated glass according to claim 1, characterized in that, In step S4, during the fine grinding wheel polishing process, a polishing liquid needs to be sprayed on the surface of the fine grinding wheel. The polishing liquid includes 249-251 parts of cerium oxide, 4416-4418 parts of water, and 332-334 parts of nano-silica or alumina. The pH value is adjusted to 5-11 using KOH.

8. The method for processing laminated glass according to claim 1, characterized in that, In step S4, during the fine grinding wheel polishing process, polishing liquid needs to be sprayed on the surface of the fine grinding wheel. The polishing liquid uses pure cerium oxide polishing powder, which contains no fluorine or has a fluorine content of less than 3%.

9. A method for processing laminated glass according to claim 1, characterized in that, In step S2, a coarse grinding wheel is used to rough polish the glass. Grinding is carried out at a uniform speed along the direction of the scratches, and the grinding depth does not exceed the maximum depth of the scratches until the linear scratches disappear. It is necessary to strictly control the grinding area and edge transition to create a smooth concave area with a slope ratio of 1:

50.

10. A method for processing laminated glass according to claim 1, characterized in that, In steps S2, S3, and S4, the transition between the polished area and the surrounding normal area must be smooth throughout the polishing process. The difference in polishing depth should be controlled within 5% of the glass thickness, and the polishing depth should not exceed 0.3 mm.

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