A cold-formed multi-layer glass product, a forming tooling and a manufacturing method thereof

Abstract

The present invention belongs to the technical field of glass, and particularly relates to a cold-formed multi-layer glass product, which comprises a back glass, a photovoltaic cell string, and a front glass arranged in sequence. A glue film is provided between the front glass and the photovoltaic cell string, and between the back glass and the photovoltaic cell string. The multi-layer glass product is integrally in a curved surface shape. Beneficial effects: The cold-formed multi-layer glass product of the present invention integrates a photovoltaic cell string, greatly expands the functions of laminated glass, realizes the combination of glass products and new energy, and has the advantages of high strength, no bubbles, good bonding strength, small thickness difference in the intermediate layer, low probability of optical deformation, low energy consumption, and high processing efficiency.

Description

Technical Field

[0001] The present invention belongs to the technical field of glass, and particularly relates to a cold-bent multi-layer glass product, a forming tooling and a manufacturing method thereof. Background Art

[0002] The light transmittance and excellent physical and chemical stability of glass determine its irreplaceable important position in the fields of architecture, aircraft, ships, vehicles, electrical appliances and new energy, etc. In many cases, it is necessary to bend glass substrates, such as the front cover glass of a curved display, and it can also be incorporated into walls, windows, modular furniture, shower doors, mirrors, etc. The existing method for bending glass uses hot forming, which has defects such as high energy consumption, high cost and optical deformation, and can only bend single-layer glass. The laminated glass obtained by hot forming bending has a single function and cannot realize the setting of a photovoltaic cell string in the middle of the laminated glass to improve the utilization rate of new energy in glass products. Summary of the Invention

[0003] In order to solve the problems existing in the prior art that bending glass by hot forming has high energy consumption, high cost and optical deformation, and the laminated glass obtained by bending has a single function, the present invention provides a cold-bent multi-layer glass product, a forming tooling and a manufacturing method thereof.

[0004] To solve the above technical problems, the technical solutions adopted by the present invention are as follows. A cold-bent multi-layer glass product includes a back glass, a photovoltaic cell string and a front glass arranged in sequence. An adhesive film is provided between the front glass and the photovoltaic cell string, and between the back glass and the photovoltaic cell string. The multi-layer glass product is in a curved surface shape as a whole.

[0005] Preferably, the front glass is selected from patterned glass or flat glass, and the back glass is also selected from patterned glass or flat glass; the patterned glass is single-sided patterned glass or double-sided patterned glass. This improves the diversity of the cold-bent multi-layer glass product.

[0006] Preferably, both the front glass and the back glass are selected from physically tempered glass; the adhesive film is selected from PVB, EVA or POE adhesive film; a sealing edge adhesive is provided around the photovoltaic cell string, and the sealing edge adhesive is located between the front glass and the back glass. This improves the strength and reliability of the cold-bent multi-layer glass product.

[0007] Furthermore, a coating layer is provided on the surface of the front glass and / or the back glass; the coating layer is an anti-reflection coating, a reflective coating, a Lowe coating, a photosensitive material coating, a conductive coating or a color paint coating.

[0008] Further, the thickness ranges of the front glass and the back glass are both 0.5 mm to 5 mm, and the thickness range of the adhesive film is 0.2 mm to 2 mm. This ensures the strength of the multi-layer glass product and facilitates the cold bending forming operation of the multi-layer glass product.

[0009] A forming tool for cold bending forming a multi-layer glass product. This forming tool is used for cold bending forming any one of the above multi-layer glass products. The forming tool includes a base, support columns, and a fixing jig arranged in sequence from bottom to top. At least two support columns are arranged in each row and each column on the base. The height of the support columns is adjustable. The number of support columns and the height of each support column are set according to the size of the curved surface shape to be cold bent formed of the multi-layer glass product. The multi-layer glass product to be cold bent formed is placed on the support columns. The multi-layer glass product is located between the fixing jig and the support columns. The fixing jig is strip-shaped, and at least two fixing jigs are arranged along the length direction of the multi-layer glass product. A C-shaped clamp is arranged between the fixing jig and the base. When the C-shaped clamp presses down the fixing jig, the fixing jig drives the multi-layer glass product to fit with each support column for cold bending forming.

[0010] Preferably, the support columns are threadedly connected to the base, and the support columns are driven to move up and down by a motor; or the support columns are slidably connected to the base, and the support columns are driven to move up and down by a cylinder. This facilitates adjusting the height of the support columns and improves the application range and use convenience of the forming tool.

[0011] Further, buffer materials are provided on the surfaces of the support columns and the fixing jig facing the multi-layer glass product. This effectively prevents damage to the appearance or mechanical integrity of the multi-layer glass product.

[0012] A manufacturing method for cold bending forming a multi-layer glass product includes the following steps:

[0013] S1. Select materials: The front glass is selected from patterned tempered glass or flat tempered glass, and the back glass is also selected from patterned tempered glass or flat tempered glass; the patterned tempered glass is single-sided patterned tempered glass or double-sided patterned tempered glass; coatings are provided on the surfaces of the front glass and / or the back glass.

[0014] S2. Stack the materials: The back glass, the first adhesive film, the photovoltaic cell string, the second adhesive film, and the front glass are placed in sequence in a flat shape.

[0015] S3. Pre-press: Put the stacked materials into a pre-pressing device, heat and apply pressure to make them pre-cured and formed, thus forming a multi-layer glass product to be cold bent formed.

[0016] S4. Cold bending forming: Set the number of support columns and the height of each support according to the size of the curved surface shape of the multi-layer glass product to be cold bent. Then place the multi-layer glass product to be cold bent on the support columns, set at least two fixing jigs along the length direction of the multi-layer glass product, and then install the C-shaped clamp between the fixing jig and the base. The C-shaped clamp presses down the fixing jig, and the fixing jig drives the multi-layer glass product to be cold bent to fit with each support column for cold bending forming;

[0017] S5. Stress relief: Preheat the high-pressure equipment to 60°C - 200°C, then put the forming tooling and the multi-layer glass product into the high-pressure equipment together, heat up and pressurize until the shape of the multi-layer glass product is solidified;

[0018] S6. Finished product inspection: Clean the surface of the multi-layer glass product and detect the power-on function of the photovoltaic cell string;

[0019] Furthermore, in step S1, the coating is applied by spraying, electroplating, physical or chemical deposition, roll coating or screen printing processes; in step S2, when placing the photovoltaic cell string, a sealing adhesive is set on the back glass or the front glass. The sealing adhesive is located around the photovoltaic cell string and is between the front glass and the back glass. The coating process is mature and the coating accuracy is high; the sealing adhesive is selectively added according to requirements such as safety or customer needs.

[0020] Beneficial effects: The cold-bent multi-layer glass product and its manufacturing method of the present invention stack the back glass, the first layer of adhesive film, the photovoltaic cell string, the second layer of adhesive film and the front glass in sequence into a flat shape. When placing the photovoltaic cell string, a sealing adhesive is set on the back glass or the front glass. The sealing adhesive is located around the photovoltaic cell string and is between the front glass and the back glass. Then pre-press the stacked materials, and then cold-bend the pre-pressed multi-layer glass product to be cold-bent at room temperature. After cold bending, heat up and pressurize in a high-pressure equipment until the shape of the multi-layer glass product is solidified to eliminate the internal stress of cold bending. This cold-bent multi-layer glass product integrates the photovoltaic cell string, greatly expands the function of the laminated glass, realizes the combination of the glass product and new energy, and has the advantages of high strength, no bubbles, good bonding strength, small thickness difference of the intermediate layer, low probability of optical deformation, low energy consumption and high processing efficiency; the forming tooling of the cold-bent multi-layer glass product of the present invention has the advantages of simple and reliable structure, ingenious design, easy operation, high efficiency, high processing quality, low cost and wide application range. Description of the Drawings

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0022] Figure 1 is a cross-sectional schematic view of Embodiment 1 of the cold-bent multi-layer glass product of the present invention;

[0023] Figure 2 is a cross-sectional schematic view of the forming tooling of Embodiment 1 of the cold-bent multi-layer glass product of the present invention;

[0024] Figure 3 is an assembly schematic view of the base and support columns of the forming tooling of Embodiment 1 of the cold-bent multi-layer glass product of the present invention;

[0025] Figure 4 is a front view schematic view of Embodiment 2 of the cold-bent multi-layer glass product of the present invention;

[0026] Figure 5 is a partial cross-sectional schematic view of Embodiment 2 of the cold-bent multi-layer glass product of the present invention;

[0027] In the figure: 11, back glass; 12, photovoltaic cell string; 13, front glass; 14, adhesive film; 15, edge sealant; 21, base; 22, support column; 23, fixing jig; 24, cushioning material. Detailed implementation manners

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. The description of at least one exemplary embodiment is actually only illustrative and in no way restrictive of the present invention and its application or use. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0029] Embodiment 1

[0030] As Figure 1As shown in the figure, a cold-formed multi-layer glass product includes a rear glass 11, a photovoltaic cell string 12, and a front glass 13 arranged in sequence. An adhesive film 14 is provided between the front glass 13 and the photovoltaic cell string 12, and between the rear glass 11 and the photovoltaic cell string 12. An edge-sealing adhesive 15 is provided around the photovoltaic cell string 12, and the edge-sealing adhesive 15 is located between the front glass 13 and the rear glass 11. The overall shape of this multi-layer glass product is a curved surface. The multi-layer glass product in this embodiment is a car sunroof, and the photovoltaic cell string 12 in this embodiment is a crystalline silicon photovoltaic cell string.

[0031] In order to improve the diversity of the cold-formed multi-layer glass product, the front glass 13 is selected from patterned glass or flat glass, and the rear glass 11 is also selected from patterned glass or flat glass. The patterned glass is single-sided patterned glass or double-sided patterned glass. The front glass 13 and the rear glass 11 in this embodiment are both selected as flat glass. In order to improve the strength and reliability of the cold-formed multi-layer glass product, the front glass 13 and the rear glass 11 in this embodiment are both selected as physically tempered glass; the adhesive film 14 is selected from PVB, EVA or POE adhesive film, and the adhesive film 14 in this embodiment is selected as PVB adhesive film; a coating layer is provided on the surface of the front glass 13 and / or the rear glass 11, and the coating layer adopts anti-reflection coating, reflective coating, Lowe coating, photosensitive material coating, conductive coating or color paint coating. An anti-reflection coating is provided on the outer surface of the front glass 13 in this embodiment, and a black paint coating is provided on the opposite surfaces of the front glass 13 and the rear glass 11 in this embodiment; in order to ensure the strength of the multi-layer glass product and facilitate the cold-forming operation of the multi-layer glass product, the thickness ranges of the front glass 13 and the rear glass 11 are both 0.5 mm to 5 mm, the thicknesses of the front glass 13 and the rear glass 11 in this embodiment are both 1.6 mm, the thickness range of the adhesive film 14 is 0.2 mm to 2 mm, and the thickness of the adhesive film 14 in this embodiment is 1 mm.

[0032] As Figure 2 and 3As shown in the figure, a forming tool for cold bending a multi-layer glass product is used to cold bend the above-mentioned multi-layer glass product. The forming tool includes a base 21, a support column 22, and a fixing jig 23 arranged in sequence from bottom to top. At least two support columns 22 are arranged in each row and each column on the base 21. The height of the support column 22 is adjustable. The number and height of each support column 22 are set according to the size of the curved surface shape to be cold bent of the multi-layer glass product. The multi-layer glass product to be cold bent is placed on the support column 22. The multi-layer glass product is located between the fixing jig 23 and the support column 22. The fixing jig 23 is strip-shaped, and at least two fixing jigs 23 are arranged along the length direction of the multi-layer glass product. In this embodiment, the fixing jig 23 is selected as a steel strip, and the number is two. The two fixing jigs 23 are located at both ends of the multi-layer glass product. A C-shaped clamp (not shown in the figure) is arranged between the fixing jig 23 and the base 21. The two ends of the fixing jig 23 extend 5 cm longer than the workpiece, which is convenient to fix the fixing jig 23 on the base 21 with the C-shaped clamp. When the C-shaped clamp presses down the fixing jig 23, the fixing jig 23 drives the multi-layer glass product to fit with each support column 22 for cold bending and forming.

[0033] In this embodiment, the height adjustment range of the support column 22 is 0 cm to 50 cm, and the distance between adjacent support columns 22 is greater than or equal to 5 cm. To facilitate the adjustment of the height of the support column 22 and improve the applicable range and use convenience of the forming tool, in this embodiment, the support column 22 is threadedly connected to the base 21, and the support column 22 is driven by a motor to move up and down (not shown in the figure); or the support column 22 is slidably connected to the base 21, and the support column 22 is driven by a cylinder to move up and down (not shown in the figure). To prevent the forming tool from damaging the appearance or mechanical integrity of the multi-layer glass product, buffer materials 24 are arranged on the surfaces of the support column 22 and the fixing jig 23 facing the multi-layer glass product. The buffer materials 24 can be selected from silica gel, felt, or rubber.

[0034] A manufacturing method for cold bending a multi-layer glass product. The multi-layer glass product in this embodiment is the above-mentioned automotive sunroof. The manufacturing method includes the following steps:

[0035] S1. Select materials: The front glass 13 and the rear glass 11 in this embodiment are both selected as flat glass. An anti-reflection coating is arranged on the outer surface of the front glass 13 in this embodiment. Black paint coatings are arranged on the opposite surfaces of the front glass 13 and the rear glass 11 by screen printing process.

[0036] S2. Stack the material layers: The rear glass 11, the first layer of adhesive film 14, the photovoltaic cell string 12, the second layer of adhesive film 14, and the front glass 13 are placed in sequence in a flat shape.

[0037] S3. Pre-pressing: Place the stacked materials into the pre-pressing equipment. The pre-pressing equipment in this embodiment can be a flat vulcanizer, a multi-chamber laminator, or a shell laminator. The pre-pressing equipment has the working capabilities of heating, pressurizing, and vacuuming. The pre-pressing equipment is preheated to 120°C, vacuumed, and then pressurized to 90 kPa and kept warm for 5 minutes to make it pre-cured and formed, thus forming a multi-layer glass product to be cold-bent and formed.

[0038] S4. Cold-bending and forming: Set the number of the support columns 22 and the height of each of the support columns 22 according to the size of the curved surface shape of the multi-layer glass product to be cold-bent and formed. Then place the multi-layer glass product to be cold-bent and formed on the support columns 22. At least two fixing jigs 23 are arranged along the length direction of the multi-layer glass product. Then install the C-clamps between the fixing jigs 23 and the base 21. The C-clamps then press down the fixing jigs 23, and the fixing jigs 23 drive the multi-layer glass product to be cold-bent and formed to fit with each support column 22 for cold-bending and forming.

[0039] S5. Stress relief: Heat up and preheat the high-pressure equipment to 60°C - 200°C. In this embodiment, the high-pressure equipment is a autoclave. The autoclave is heated up and preheated to 150°C. Then put the forming tooling and the multi-layer glass product into the high-pressure equipment together, heat up and pressurize until the shape of the multi-layer glass product is solidified. In this embodiment, it is pressurized to 5 times the atmospheric pressure, keep warm and pressurized for 10 minutes. This process relieves the internal stress caused by the bending of the multi-layer glass product in the room temperature environment, and keeps the shape after cooling without springback.

[0040] S6. Finished product inspection: Clean the surface of the multi-layer glass product and detect the power-on function of the photovoltaic cell string 12.

[0041] Embodiment 2

[0042] As Figure 4 and Figure 5 shown, in this embodiment, the difference from Embodiment 1 is that the multi-layer glass product in this embodiment is a building-use curved photovoltaic module; there is a sealing edge glue 15 arranged around the photovoltaic cell string 12, and the sealing edge glue 15 is located between the front glass 13 and the back glass 11. The sealing edge glue 15 is selectively added according to requirements such as the safety of building design or customer needs, etc.; the front glass 13 in this embodiment uses ultra-clear float glass, and the back glass 11 in this embodiment uses ordinary float glass; the adhesive film 14 in this embodiment selects an EVA adhesive film.

[0043] When manufacturing the bent photovoltaic module for buildings: in step S1, the front glass 13 of this embodiment is selected as ultra-clear float glass, and the back glass 11 of this embodiment is selected as ordinary float glass; in step S2, when placing the photovoltaic cell string 12, an edge-sealing adhesive 15 is set on the back glass 11 or the front glass 13. The edge-sealing adhesive 15 is located around the photovoltaic cell string 12 and is between the front glass 13 and the back glass 11; in step S3, after the pre-pressing equipment is preheated to 145 °C, evacuated, and then pressurized to 90 kPa and kept warm for 20 min to make it pre-cured and formed, a multi-layer glass product to be cold-bent and formed is obtained; in step S5, the autoclave of this embodiment is heated and preheated to 150 °C, and then the forming tooling and the multi-layer glass product are put into the high-pressure equipment together, heated and pressurized until the shape of the multi-layer glass product is solidified. In this embodiment, it is pressurized to 10 times the atmospheric pressure, kept warm and pressurized for 15 min. This process eliminates the internal stress caused by bending the multi-layer glass product at room temperature, and the shape is maintained after cooling without springback.

[0044] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A manufacturing method of a cold-formed multi-layer glass product, characterized in that: The cold-formed multi-layer glass product described above includes a rear glass (11), a photovoltaic cell string (12), and a front glass (13) arranged in sequence. A glue film (14) is provided between the front glass (13) and the photovoltaic cell string (12), and between the rear glass (11) and the photovoltaic cell string (12). The multi-layer glass product as a whole is in a curved surface shape; The manufacturing method of the cold-formed multi-layer glass product includes the following steps: S1. Select materials: The front glass (13) is selected from patterned tempered glass or flat tempered glass, and the rear glass (11) is also selected from patterned tempered glass or flat tempered glass; the patterned tempered glass is single-sided patterned tempered glass or double-sided patterned tempered glass; a coating is provided on the surface of the front glass (13) and / or the rear glass (11); S2. Stack the material layers: The rear glass (11), the first glue film (14), the photovoltaic cell string (12), the second glue film (14), and the front glass (13) are placed in sequence in a flat shape; S3. Pre-press: Put the stacked materials into a pre-pressing device, heat and press them to pre-cure and form a multi-layer glass product to be cold-formed; S4. Cold-forming: Set the number of support columns (22) and the height of each support column (22) according to the size of the curved surface shape of the multi-layer glass product to be cold-formed. Then place the multi-layer glass product to be cold-formed on the support columns (22), set at least two fixing jigs (23) along the length direction of the multi-layer glass product, and then install a C-shaped clamp between the fixing jig (23) and the base (21). The C-shaped clamp presses down the fixing jig (23), and the fixing jig (23) drives the multi-layer glass product to be cold-formed to fit with each support column (22) for cold-forming; S5. Eliminate internal stress: Heat up and preheat the high-pressure device to 60°C to 200°C, then put the forming tooling and the multi-layer glass product into the high-pressure device together, heat up and pressurize until the shape of the multi-layer glass product is solidified; S6. Final product inspection: Clean the surface of the multi-layer glass product and detect the power-on function of the photovoltaic cell string (12).

2. The manufacturing method of the cold-formed multi-layer glass product according to claim 1, characterized in that: In step S1, the coating is plated by spraying, electroplating, physical or chemical deposition, roll coating or screen printing; in step S2, when placing the photovoltaic cell string (12), a sealing glue (15) is provided on the rear glass (11) or the front glass (13). The sealing glue (15) is located around the photovoltaic cell string (12), and the sealing glue (15) is located between the front glass (13) and the rear glass (11).

3. The manufacturing method of the cold-formed multi-layer glass product according to claim 1, characterized in that: The front glass (13) is selected from patterned glass or flat glass, and the rear glass (11) is also selected from patterned glass or flat glass; the patterned glass is single-sided patterned glass or double-sided patterned glass.

4. The manufacturing method of the cold-formed multi-layer glass product according to claim 1, characterized in that: Both the front glass (13) and the rear glass (11) are selected from physically tempered glass; the glue film (14) is selected from PVB, EVA or POE glue film (14); the photovoltaic cell string (12) is provided with a sealing glue (15) around it, and the sealing glue (15) is located between the front glass (13) and the rear glass (11).

5. The manufacturing method of the cold-formed multi-layer glass product according to claim 4, characterized in that: The surfaces of the front glass (13) and / or the back glass (11) are both provided with coatings; the coatings are anti-reflection coatings, reflective coatings, Low-E coatings, photosensitive material coatings, conductive coatings or color paint coatings.

6. The manufacturing method of the cold-formed multi-layer glass product according to claim 4, characterized in that: The thickness ranges of the front glass (13) and the back glass (11) are both 0.5 mm to 5 mm, and the thickness range of the adhesive film (14) is 0.2 mm to 2 mm.

7. The manufacturing method of the cold-formed multi-layer glass product according to any one of claims 1 to 6, characterized in that: The forming tooling includes a base (21), a support column (22) and a fixing jig (23) which are arranged in sequence from bottom to top. At least two support columns (22) are arranged in each row and each column on the base (21). The height of the support column (22) is adjustable. The number of the support columns (22) and the height of each support column (22) are set according to the size of the curved surface shape of the multi-layer glass product to be cold-bent and formed. The multi-layer glass product to be cold-bent and formed is placed on the support columns (22). The multi-layer glass product is located between the fixing jig (23) and the support columns (22). The fixing jig (23) is strip-shaped, and at least two fixing jigs (23) are arranged along the length direction of the multi-layer glass product. A C-clamp is arranged between the fixing jig (23) and the base (21). After the C-clamp presses down the fixing jig (23), the fixing jig (23) drives the multi-layer glass product to be in fit with each support column (22) for cold-bending and forming.

8. The manufacturing method of the cold-formed multi-layer glass product according to claim 7, characterized in that: The support column (22) is threadedly connected to the base (21), and the support column (22) is driven by a motor to move up and down; or the support column (22) is slidably connected to the base (21), and the support column (22) is driven by a cylinder to move up and down.

9. The manufacturing method of the cold-formed multi-layer glass product according to claim 7, characterized in that: Buffer materials (24) are provided on the surfaces of the support columns (22) and the fixing jig (23) facing the multi-layer glass product.

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