3D curved glass thermal forming cover plate structure and process method thereof

Abstract

The invention relates to the technical field of glass processing, and discloses a 3D curved surface glass thermal forming cover plate structure, which comprises a glass substrate in an inward bending 3D curved surface structure, and the edge corner of the glass substrate is in a radian design; the ink layer is formed in the non-visual area of the glass substrate through silk-screen printing or spraying; according to the 3D curved glass thermal forming cover plate structure and the process method thereof, through the ink layer and the hardened layer which are designed according to a special formula, the adhesive force and the high temperature resistance of the 3D curved glass thermal forming cover plate structure on the 3D curved glass are greatly improved; the problems of falling and discoloration of the ink layer in the thermal forming and subsequent processing processes are effectively avoided, and the shading effect and appearance integrity of the product are ensured.

Description

Technical Field

[0001] This invention relates to the field of glass processing technology, specifically to a 3D curved glass thermoforming cover plate structure and its processing method. Background Technology

[0002] With the rapid development of industries such as consumer electronics and automotive displays, 3D curved glass has been widely used in cover glass structures due to its advantages such as aesthetics, ergonomic fit, and the ability to achieve a larger screen-to-body ratio. Products such as smartwatches and in-vehicle central control screens are increasingly adopting 3D curved glass covers to enhance the product's appearance and user interaction experience.

[0003] The design and manufacturing of 3D curved glass covers currently face multiple challenges. Structurally, the complex shapes of 3D curved glass place high demands on the adaptability of functional layers such as ink layers and hardening layers. Traditional ink layers on 3D curved glass are prone to insufficient adhesion and poor high-temperature resistance. Especially during glass thermoforming and subsequent processing and use, the ink layer may peel off or discolor, affecting the product's light-blocking effect and appearance integrity. Simultaneously, the hardening layer in the visible area needs to balance high hardness and a refractive index compatible with the glass substrate to ensure display quality and glass surface abrasion resistance. Existing hardening layers have room for improvement in 3D curved surface adaptability and performance stability. If the refractive index differs significantly from the glass substrate, optical distortion can easily occur, affecting the visual experience. Therefore, we propose a 3D curved glass thermoforming cover structure and its processing method to address the aforementioned problems. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a 3D curved glass thermoforming cover plate structure and its processing method, which solves the problems of insufficient adhesion of traditional ink layers on 3D curved glass, poor high-temperature resistance, easy peeling, discoloration, impact on light blocking, appearance, and insufficient hardness and refractive index compatibility.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a 3D curved glass thermoforming cover plate structure and its manufacturing process, comprising:

[0006] The glass substrate has an inwardly curved 3D surface structure, and the corners of the glass substrate are designed with an arc.

[0007] An ink layer is formed on a non-visible area of ​​the glass substrate by screen printing or spraying.

[0008] A hardened layer covers the visible area of ​​the glass substrate and the outer surface of the ink layer.

[0009] Preferably, the ink layer has a thickness of 5-50 μm, and its temperature resistance is ≥300℃.

[0010] Preferably, the hardness of the hardened layer is ≥8H, and the difference in refractive index between the hardened layer and the glass substrate is ≤0.1.

[0011] Preferably, the ink layer is a UV-curable ink or a high-temperature sintering ink, and contains a light-blocking agent and a heat-resistant adhesive, with a light-blocking rate of ≥95%.

[0012] Preferably, the hardened layer is a nano-silica modified organosilicon resin with a surface roughness Ra≤0.01μm.

[0013] This invention provides a process method for a 3D curved glass thermoforming cover structure;

[0014] S1. Cut the flat glass substrate into shape and polish the edges to Ra≤0.1μm;

[0015] S2. Print the ink twice in the non-visible area. The first print is 20-30μm thick and the second print is 10-20μm thick. Pre-bake at 80-120℃ after each print.

[0016] S3. Place the glass in a hot bending mold and press it into shape by heating it in sections to 600-850℃.

[0017] S4. Chemically strengthen the formed glass by immersing it in potassium nitrate molten salt for 2-8 hours.

[0018] S5. Spray a hardening liquid onto the visible area and the surface of the ink layer, and let it cure to form a hardened layer.

[0019] Preferably, in step S2, the ink layer is printed using high-precision screen printing with a screen mesh count of 200-400 mesh and a printing accuracy error of ≤0.05mm.

[0020] Preferably, in step S3, the specific parameters for hot pressing are as follows: First stage: heating to 300-400℃ at 5-10℃ / min and holding for 10-20min; Second stage: heating to 600-850℃ at 3-5℃ / min and holding for 5-15min before pressing.

[0021] Preferably, in step S3, after hot pressing, an annealing process is also included, in which the temperature is reduced to below 200°C at a rate of 2-5°C / min to eliminate internal stress.

[0022] Preferably, in step S5, the curing of the hardening liquid is performed using UV light curing with a wavelength of 365 nm and an energy density of 500-1000 mJ / cm². 2 .

[0023] Beneficial effects

[0024] This invention provides a 3D curved glass thermoforming cover plate structure and its manufacturing process. Compared with the prior art, it has the following advantages:

[0025] This 3D curved glass thermoforming cover structure and its process significantly improves adhesion and high-temperature resistance on 3D curved glass through specially formulated ink and hardening layers. This effectively prevents ink layer peeling and discoloration during thermoforming and subsequent processing, ensuring the product's light-blocking effect and appearance integrity. Furthermore, the invention optimizes the performance of the hardening layer in the visible area, maintaining high hardness while possessing a refractive index compatible with the glass substrate, preventing optical distortion and enhancing the visual experience. In addition, this invention improves the adaptability and performance stability of the hardening layer on 3D curved surfaces. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0027] In the figure: 101, glass substrate; 102, ink layer; 103, hardening layer. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] like Figure 1 As shown:

[0030] A 3D curved glass thermoformed cover structure, comprising:

[0031] The glass substrate 101 has an inwardly curved 3D surface structure, and the corners of the glass substrate 101 are designed with an arc.

[0032] The ink layer 102 is formed on the non-visible area of ​​the glass substrate 101 by screen printing or spraying. The thickness of the ink layer 102 is 5-50μm. The temperature resistance is ≥300℃. The ink layer 102 is a UV-curable ink or a high-temperature sintering ink, and contains a light-blocking agent and a heat-resistant adhesive. The light-blocking rate is ≥95%.

[0033] The hardened layer 103 covers the visible area of ​​the glass substrate 101 and the outer surface of the ink layer 102. The hardness of the hardened layer 103 is ≥8H, the difference in refractive index between the hardened layer 103 and the glass substrate 101 is ≤0.1, the hardened layer 103 is nano-silica modified organosilicon resin, and the surface roughness Ra is ≤0.01μm.

[0034] This invention provides a process method for a 3D curved glass thermoforming cover structure;

[0035] S1. Cut the flat glass substrate 101 into shape and polish the edges to Ra≤0.1μm;

[0036] S2. Print the ink twice in the non-visible area. The first print is 20-30μm thick and the second print is 10-20μm thick. Pre-bake at 80-120℃ after each print.

[0037] S3. Place the glass in a hot bending mold and heat it in sections to 600-850℃ to press it into shape. The specific parameters for hot pressing are: First stage: heat up to 300-400℃ at 5-10℃ / min and hold for 10-20min; Second stage: heat up to 600-850℃ at 3-5℃ / min and hold for 5-15min before pressing. After hot pressing, annealing is also included, cooling down to below 200℃ at 2-5℃ / min to eliminate internal stress.

[0038] S4. Chemically strengthen the formed glass by immersing it in potassium nitrate molten salt for 2-8 hours.

[0039] S5. Spray a hardening liquid onto the visible area and the surface of ink layer 102, and cure to form hardened layer 103. The curing of the hardening liquid is performed using UV light curing at a wavelength of 365nm and an energy density of 500-1000mJ / cm². 2 .

[0040] In this implementation scheme: an aluminosilicate glass substrate 101 with a thickness of 1.5mm is selected, and a preset 3D curved surface contour is initially formed by CNC precision carving. Then, the cut glass substrate 101 is placed in a graphite mold and hot-bent by applying a pressure of 0.5MPa to form an inwardly curved 3D curved surface structure. The corners of the edges are designed with an arc of R=5.0mm. The temperature is gradually reduced to below 300℃ at a gradient of 5℃ / min to eliminate residual stress.

[0041] The ink layer 102 comprises a light-blocking agent, a heat-resistant adhesive, and an organic carrier. The light-blocking agent may be nano carbon black, with a weight ratio of 20%. The heat-resistant adhesive is zirconium silicate glass powder, with a weight ratio of 45%. The organic carrier is ethyl cellulose and terpineol, with a weight ratio of 30%, and the ratio of ethyl cellulose to terpineol is 1:3.

[0042] The hardened layer 103 is a nano-silica modified organosilicon resin with 1% fluorosilane added by weight to improve its oleophobicity.

[0043] Preparation process;

[0044] S1. The aluminosilicate flat glass substrate 101 is CNC cut into the designed shape, and the edges are polished with a diamond wheel to Ra=0.08μm;

[0045] S2. Use a 300-mesh screen to print high-temperature ink in non-visible areas. After the first printing, bake at 100°C for 15 minutes and after the second printing, bake at 110°C for 10 minutes. The total thickness is controlled at 35±2μm.

[0046] S3. Place the glass substrate 101 into the graphite mold and hot press it in sections. First stage: heat up to 380℃ at 8℃ / min and hold for 15min. Second stage: heat up to 780℃ at 4℃ / min and hold for 10min, then apply 0.5MPa pressure to form and cool down to 180℃ at 3℃ / min to relieve stress.

[0047] S4. After immersion in potassium nitrate molten salt at 420℃ for 6 hours, the surface compressive stress after ion exchange is ≥800MPa.

[0048] Spraying nano-silica hardener, solid content 30%, UV curing wavelength 365nm, energy density 800mJ / cm³ 2 , forming a hardened layer 103.

[0049] This solution, through a specially formulated ink layer 102 and hardening layer 103, significantly improves the adhesion and high-temperature resistance of the ink layer 102 on 3D curved glass, effectively preventing the ink layer 102 from peeling off and discoloring during thermoforming and subsequent processing, ensuring the product's light-blocking effect and appearance integrity. Simultaneously, this invention pays special attention to optimizing the performance of the hardening layer 103 in the visible area, ensuring it maintains high hardness while possessing a refractive index compatible with the glass substrate 101, avoiding optical distortion and enhancing the visual experience. Furthermore, this invention also improves the compatibility and performance stability of the hardening layer 103 on 3D curved surfaces.

[0050] It should be noted that if the glass deformation is uneven after molding and the deviation exceeds ±0.1mm, the mold pressure should be adjusted first (pressure adjustment range is ±5%-15%), and the glass should be re-pressed using the following process: "First stage: heat up to 300-400℃ at 5-10℃ / min and hold for 10-20min; Second stage: heat up to 600-850℃ at 3-5℃ / min and hold for 5-15min". If the problem is still not resolved after adjusting the pressure, the process can be traced back to step S1, and the flat glass substrate 101 can be cut and polished again to eliminate the influence of defects in the original glass blank.

[0051] It should be noted that: R ≥ 2 × glass thickness (e.g., for 1.5mm glass, R = 3.0mm at least).

[0052] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A 3D curved glass thermoforming cover structure, characterized in that: include: The glass substrate (101) has an inwardly curved 3D surface structure, and the corners of the glass substrate (101) are designed with an arc. An ink layer (102) is formed on a non-visible area of ​​the glass substrate (101) by screen printing or spraying; A hardened layer (103) covers the visible area of ​​the glass substrate (101) and the outer surface of the ink layer (102).

2. The 3D curved glass thermoforming cover plate structure according to claim 1, characterized in that: The ink layer (102) has a thickness of 5-50 μm and a temperature resistance of ≥300℃.

3. The 3D curved glass thermoforming cover plate structure according to claim 2, characterized in that: The hardened layer (103) has a hardness ≥8H and a refractive index difference ≤0.1 from that of the glass substrate.

4. The 3D curved glass thermoforming cover plate structure according to claim 2, characterized in that: The ink layer (102) is a UV-curable ink or a high-temperature sintering ink, and contains a light-blocking agent and a heat-resistant adhesive, with a light-blocking rate of ≥95%.

5. The 3D curved glass thermoforming cover plate structure according to claim 1, characterized in that: The hardened layer (103) is a nano-silica modified organosilicon resin with a surface roughness Ra≤0.01μm.

6. The process method for a 3D curved glass thermoforming cover plate structure according to any one of claims 1-5, characterized in that... ； S1. Cut the flat glass substrate (101) into shape and polish the edges to Ra≤0.1μm; S2. Print the ink twice in the non-visible area. The first print is 20-30μm thick and the second print is 10-20μm thick. Pre-bake at 80-120℃ after each print. S3. Place the glass in a hot bending mold and press it into shape by heating it in sections to 600-850℃. S4. Chemically strengthen the formed glass by immersing it in potassium nitrate molten salt for 2-8 hours. S5. Spray a hardening liquid onto the visible area and the surface of the ink layer, and cure to form a hardened layer (103).

7. The process method for the 3D curved glass thermoforming cover plate structure according to claim 6, characterized in that: In step S2, the ink layer (102) is printed using high-precision screen printing with a screen mesh count of 200-400 mesh and a printing accuracy error of ≤0.05mm.

8. The process method for the 3D curved glass thermoforming cover plate structure according to claim 6, characterized in that: In S3, the specific parameters for hot pressing are as follows: First stage: heat up to 300-400℃ at 5-10℃ / min and hold for 10-20min; Second stage: heat up to 600-850℃ at 3-5℃ / min and hold for 5-15min before pressing.

9. The process method for the 3D curved glass thermoforming cover plate structure according to claim 6, characterized in that: In step S3, after hot pressing, an annealing process is also included, in which the temperature is reduced to below 200°C at a rate of 2-5°C / min to eliminate internal stress.

10. The process method for the 3D curved glass thermoforming cover plate structure according to claim 6, characterized in that: In step S5, the curing liquid is cured using UV light with a wavelength of 365 nm and an energy density of 500-1000 mJ / cm². 2 .

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