Hot bending tempered glass film
By using a dual-substrate composite process and precision-polished hot-bending tempered glass film, the problem of poor adhesion of traditional tempered glass films on curved screens has been solved, achieving high transparency and aesthetics, and improving user experience and device durability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-16
- Publication Date
- 2026-04-07
AI Technical Summary
Traditional tempered glass screen protectors are difficult to fit precisely to curved screens, resulting in problems such as white edges, bubbles, and lifting, which affect the user experience. In addition, the traditional screen printing process affects the aesthetics and transparency.
The process employs a dual-substrate composite technology, including a high-transparency silicone coating layer, a silicone gel filling layer, and an OCA acrylic adhesive coating layer, combined with an epoxy resin edge sealing layer. Through precise grinding and high-temperature baking, a sealed structure is formed, eliminating the need for traditional ink screen printing.
It achieves a tight fit between the glass film and the curved screen, reduces white edges and bubbles, enhances aesthetics and practicality, ensures strong adhesion and dustproof effect, and improves touch smoothness and lifespan.
Smart Images
Figure CN224089823U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of screen protector technology, and in particular to a heat-bending tempered glass film. Background Technology
[0002] With the rapid development of smartphone screen technology, 2.5D and 3D curved screen designs are gradually becoming the mainstream trend. Curved screens not only enhance the aesthetics of mobile phones but also provide users with a better feel and visual experience. However, traditional flat tempered glass screen protectors struggle to perfectly fit curved screens, leading to a series of problems that severely impact the user experience. Currently, most curved screen protectors on the market suffer from issues such as screen printing peeling, white edges, air bubbles, and poor adhesion, hindering the development of curved screen protectors.
[0003] First, traditional tempered glass screen protectors typically use screen printing to print ink on the edges to address issues like white edges and adhesive layer coverage. However, screen printing has significant drawbacks: the ink layer is prone to peeling off, affecting aesthetics; the screen-printed edges easily trap dirt and grime, making them difficult to clean; furthermore, screen printing designs cannot meet users' desire for transparency or minimalist styles, limiting the design diversity of tempered glass screen protectors. Second, due to the complex curvature of curved screens, traditional tempered glass screen protectors are prone to white edges during application. This is mainly due to a mismatch between the screen protector's curvature and the screen's, or uneven adhesive layer coating, causing light to refract at the edges, creating white gaps that severely affect the visual experience. In addition, insufficient precision in the hot bending process and poor adhesive layer air release are also important reasons for poor tempered glass screen protector adhesion. Insufficient precision in the hot bending process results in tiny gaps between the tempered glass screen protector and the screen, while poor adhesive layer air release leaves residual air bubbles at the edges, affecting touch sensitivity and user experience.
[0004] To address the aforementioned issues, existing technologies have attempted several solutions, but all have significant drawbacks. For example, using screen printing to cover the white edges and adhesive layer can temporarily solve the problem, but it sacrifices light transmission and aesthetics, failing to meet the needs of high-end users. Another solution is to use AB glue (OCA) for bonding. While this method can reduce bubble formation, the process is complex, has a low yield rate, and the edges easily attract dust, affecting long-term performance. Furthermore, traditional heat-bending films, due to material and process limitations, struggle to simultaneously resolve the white edge and bubble issues, resulting in a poor user experience. Therefore, developing a technology that can precisely fit curved screens, resolve issues such as white edges, bubbles, and edge lifting, while simultaneously meeting users' needs for both aesthetics and practicality in heat-bending tempered glass films, has become a pressing technical challenge. Utility Model Content
[0005] This utility model aims to solve at least one of the technical problems existing in the prior art. To this end, this utility model proposes a hot-bending tempered glass screen protector that can eliminate the traditional ink screen printing process, while accurately fitting curved screens and solving problems such as white edges, bubbles, and curling edges, thus meeting users' needs for both aesthetics and practicality in hot-bending tempered glass screen protectors.
[0006] The technical solution adopted by this utility model to solve its technical problem is:
[0007] A heat-bending tempered glass film, comprising:
[0008] Hot-bent glass substrate with polished edges;
[0009] A sandwich adhesive layer is disposed on the lower surface of the hot-bent glass substrate for bonding the hot-bent glass substrate and the mobile phone screen. The sandwich adhesive layer includes, from top to bottom, a high-transparency silicone coating layer, a first substrate layer, a silicone gel filling layer, a second substrate layer and an OCA acrylic adhesive coating layer.
[0010] An epoxy resin edge-sealing layer is used to seal the edges of the sandwich adhesive layer.
[0011] A heat-bending tempered glass film according to an embodiment of this utility model has at least the following beneficial effects: A dual-substrate composite process is employed, where a high-transparency silicone coating layer is uniformly coated onto a first substrate layer using a micron-level high-precision coating machine, while an OCA acrylic adhesive is uniformly coated onto a second substrate layer to form an OCA acrylic adhesive coating layer. A sandwich filling technology is used to fill the space between the first and second substrate layers with an elastic and semi-fluid silicone gel, forming a silicone gel filling layer. The upper low-viscosity, high-transparency silicone coating layer (dynamic viscosity ≤ 500 cP) enables rapid air venting; the lower high-viscosity OCA acrylic adhesive coating layer (adhesive strength ≥ 2 N / cm) ensures strong adhesion; and the intermediate silicone gel filling layer automatically fills the screen curvature tolerance, effectively reducing the generation of bubbles and white edges, and improving the overall bonding effect. Epoxy resin adhesive is applied to the edges of the sandwich adhesive layer using a dispensing machine. The layer is then baked in a tunnel oven at 60-80°C to cure the adhesive, forming an epoxy resin sealing layer. This layer effectively seals the edges of the sandwich adhesive layer, preventing dust and debris from entering. Therefore, this novel hot-bending tempered glass film eliminates the need for traditional ink screen printing, while precisely fitting curved screens and resolving issues such as white edges, bubbles, and curling edges, thus meeting users' needs for both aesthetics and practicality in hot-bending tempered glass films.
[0012] According to some embodiments of the present invention, the upper surface of the hot-bent glass substrate is coated with an AF coating.
[0013] The benefits include: the AF coating, with its oleophobic and hydrophobic properties, effectively reduces fingerprints and smudges, keeping the screen clean for longer and reducing the hassle of frequent cleaning. Furthermore, the AF coating reduces the coefficient of friction on the screen surface, making touch operation smoother and more fluid, further enhancing the user experience and satisfaction.
[0014] According to some embodiments of the present invention, the thickness of the hot-bent glass substrate is 0.15mm-0.3mm.
[0015] The advantages are: this range of thicknesses in the hot-bent glass substrate ensures the film has sufficient impact and bending resistance while minimizing its weight and thickness, allowing it to perfectly fit curved screens and avoiding visual jarring or inconvenient operation caused by excessive thickness. This design also allows the device to maintain its original slim and lightweight appearance, enhancing overall aesthetics and portability.
[0016] According to some embodiments of the present invention, the edge of the hot-bent glass substrate is polished to a thickness of 0.1mm-0.2mm.
[0017] The benefits include: finely polished edges on the hot-bent glass substrate ensure a smooth surface and prevent edge lifting. This edge thickness range ensures a smoother edge for the hot-bent glass substrate, reducing the possibility of edge lifting and improving the overall aesthetics and safety of the glass film. Finely polished edges also effectively prevent discomfort caused by overly sharp edges when operating devices, further enhancing the user experience. Furthermore, the thinner edge thickness helps the glass film better fit curved screens, reducing issues like poor adhesion or visual abruptness caused by excessively thick edges.
[0018] According to some embodiments of the present invention, the hot-bent glass substrate is high-alumina silicate glass.
[0019] The advantages are: the high hardness and impact resistance of high-aluminosilicate glass allow it to withstand scratches and bumps in daily use, extending the screen's lifespan. Furthermore, its high light transmittance reduces light reflection and scattering, ensuring clear and bright screen display content and providing users with a superior visual experience.
[0020] According to some embodiments of the present invention, the thickness of the high-transparency silicone coating layer is 20±10μm.
[0021] The benefits are that the high-transparency silicone coating of this thickness range can quickly expel air during the bonding process, reducing the generation of air bubbles, while ensuring a tight bond between the adhesive layer and the screen. This avoids problems such as reduced light transmittance or poor adhesion caused by local areas being too thick or too thin, thus improving the overall bonding effect.
[0022] According to some embodiments of the present invention, the thickness of the silicone gel filling layer is 25±10μm.
[0023] The benefits are that this thickness of silicone gel filler layer can fully utilize its elasticity and semi-fluidity to automatically fill the curvature tolerance between the screen and the glass film, effectively reducing the generation of bubbles and white edges, and improving the bonding effect. At the same time, this thickness design ensures the filling effect while avoiding problems such as unstable bonding or reduced light transmittance caused by being too thick or too thin, enabling the glass film to achieve uniform and tight bonding on curved screens, improving the overall user experience.
[0024] According to some embodiments of the present invention, the thickness of the OCA acrylic adhesive coating layer is 50±10μm.
[0025] The advantage is that this thickness of OCA acrylic adhesive coating can maintain good light transmittance while ensuring strong adhesion, so that the screen display effect is not affected. Its thickness design can also effectively avoid uneven bonding caused by excessively thick adhesive layers or weak bonding caused by excessively thin layers, ensuring a tight fit between the glass film and the screen.
[0026] According to some embodiments of the present invention, the thickness of the first substrate layer and the second substrate layer is 25±10μm.
[0027] The advantage is that this substrate layer thickness range ensures sufficient mechanical strength and support while minimizing the overall structure's thickness and weight, allowing it to better adapt to the curvature of curved screens. This design not only improves the fit but also makes the glass film thinner and lighter, enhancing user comfort.
[0028] According to some embodiments of the present invention, both the first substrate layer and the second substrate layer are made of PET material.
[0029] The advantages are: the high flexibility of PET material allows it to adapt to the curvature of curved screens, preventing breakage or deformation caused by bending. Its high light transmittance and mechanical strength also ensure that the glass film maintains clear display and stable performance during long-term use, while improving the product's durability and lifespan.
[0030] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description
[0031] To more clearly illustrate the technical solutions of the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0032] Figure 1 This is a schematic diagram of the structure of a heat-bent tempered glass film according to an embodiment of the present utility model;
[0033] Figure 2 for Figure 1 Enlarged view of point A in the middle;
[0034] Figure 3 for Figure 1 A schematic diagram of the sandwich adhesive layer.
[0035] Reference numerals: Hot-bent glass substrate 100, sandwich adhesive layer 110, high-transparency silicone coating layer 120, first substrate layer 130, silicone gel filling layer 140, second substrate layer 150, OCA acrylic adhesive coating layer 160, epoxy resin edge sealing layer 170, AF coating 180. Detailed Implementation
[0036] The embodiments of this utility model 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 this utility model, and should not be construed as limiting this utility model.
[0037] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model.
[0038] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" and "second" are mentioned, this is only for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features or the order of the indicated technical features.
[0039] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation, connection, and linkage" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0040] The following is for reference. Figures 1-3 A hot-bending tempered glass film is described in detail with reference to a specific embodiment. It is to be understood that the following description is merely illustrative and not intended to limit the scope of the invention.
[0041] In this embodiment, a hot-bent tempered glass film includes a hot-bent glass substrate 100, a sandwich adhesive layer 110, and an epoxy resin edge-sealing layer 170. The edges of the hot-bent glass substrate 100 are finely polished to ensure smooth edges and prevent edge lifting. The sandwich adhesive layer 110 is disposed on the lower surface of the hot-bent glass substrate 100 and is used to bond the hot-bent glass substrate 100 and the mobile phone screen. The sandwich adhesive layer 110 includes, from top to bottom, a high-transparency silicone coating layer 120, a first substrate layer 130, a silicone gel filling layer 140, a second substrate layer 150, and an OCA acrylic adhesive coating layer 160. The epoxy resin edge-sealing layer 170 is used to seal the edges of the sandwich adhesive layer 110 to prevent dust and debris from entering. This structural design, through fine polishing of the edges of the hot-bent glass substrate 100, effectively reduces edge lifting problems and improves the overall aesthetics and safety of the glass film. The multi-layer design of the sandwich adhesive layer 110, combining a high-transparency silicone coating layer 120, a silicone gel filling layer 140, and an OCA acrylic adhesive coating layer 160, enables rapid air venting, strong adhesion, and automatic filling of screen curvature tolerances, significantly reducing the generation of bubbles and white edges, and improving the bonding effect. The epoxy resin sealing layer 170 further enhances the sealing performance of the sandwich adhesive layer 110, preventing dust and debris from entering and extending the lifespan of the glass film.
[0042] Specifically, such as Figure 1 and Figure 2As shown, the thickness of the hot-bent glass substrate 100 is 0.15mm-0.3mm. This thickness range ensures both the strength and durability of the glass film while allowing for a thinner design, resulting in a more natural fit to curved screens without affecting the device's appearance or feel. The edges of the hot-bent glass substrate 100 are ground to a thickness of 0.1mm-0.2mm. This edge thickness range ensures smoother edges, reducing the possibility of edge lifting and improving the overall aesthetics and safety of the glass film. The finely ground edges also effectively prevent discomfort caused by overly sharp edges when operating the device, further enhancing the user experience. Furthermore, the thinner edge thickness helps the glass film better fit the curved screen, reducing issues of poor fit or visual abruptness caused by excessively thick edges. The hot-bent glass substrate 100 uses high-aluminosilicate glass, whose high hardness and impact resistance allow it to withstand scratches and collisions during daily use, extending the screen's lifespan, while also possessing high light transmittance to ensure clear display. The upper surface of the hot-bent glass substrate 100 is coated with an AF coating 180. The AF coating 180, through its oleophobic and hydrophobic properties, effectively reduces fingerprint and smudge residue, keeping the screen clean for extended periods and reducing the need for frequent cleaning. Furthermore, the AF coating 180 also reduces the coefficient of friction on the screen surface, making touch operation smoother and more fluid, further enhancing the user experience and satisfaction.
[0043] It should be said that, as Figure 3 As shown, the thickness of the high-transparency silicone coating layer 120 is 20±10μm. This thickness range ensures that the high-transparency silicone layer maintains good light transmittance and adhesion while achieving rapid air venting, avoiding problems such as bubbles or poor adhesion caused by uneven thickness. The thickness of the silicone gel filler layer 140 is 25±10μm. This thickness range fully utilizes its elasticity and semi-fluidity properties to automatically fill the curvature tolerance between the screen and the glass film, effectively reducing the generation of bubbles and white edges, and improving the adhesion effect. At the same time, this thickness design ensures the filling effect while avoiding problems such as unstable adhesion or reduced light transmittance caused by being too thick or too thin, enabling the glass film to achieve uniform and tight adhesion on the curved screen, improving the overall user experience. The thickness of the OCA acrylic adhesive coating layer 160 is 50±10μm. This thickness range ensures that the OCA acrylic adhesive layer provides sufficient adhesion (≥2N / cm), while avoiding problems such as poor adhesion or reduced light transmittance caused by the adhesive layer being too thick or too thin.
[0044] It is worth mentioning that, such as Figure 3As shown, the thickness of the first substrate layer 130 and the second substrate layer 150 is 25±10μm. This thickness range ensures that the substrate layers provide sufficient support while maintaining the overall thinness of the structure, facilitating adhesion to curved screens and improving the user experience. Both the first substrate layer 130 and the second substrate layer 150 are made of PET material, whose high flexibility allows it to adapt to the curvature of the curved screen, preventing cracking or deformation caused by bending. Its high light transmittance and mechanical strength also ensure that the glass film maintains clear display and stable performance during long-term use, while improving the product's durability and lifespan.
[0045] In summary, epoxy resin adhesive is applied to the perimeter of the sandwich adhesive layer 110 using a dispensing machine, and then baked in a tunnel oven at a high temperature of 60-80℃ to cure the adhesive and form an epoxy resin edge-sealing layer 170, which is used to seal the edges of the sandwich adhesive layer 110. This process effectively seals the edges of the sandwich adhesive layer 110, preventing dust and debris from entering. Therefore, the hot-bending tempered glass film of this invention can eliminate the traditional ink screen printing process, while accurately fitting curved screens and solving problems such as white edges, bubbles, and edge lifting, thus meeting users' needs for both aesthetics and practicality in hot-bending tempered glass films.
[0046] In the description of this specification, references to terms such as "an embodiment," "some embodiments," "illustrative embodiments," "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 present invention. In this specification, 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.
[0047] The terms "first," "second," "third," "fourth," etc. (if applicable) in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments described herein can be implemented in a sequence other than that illustrated or described herein.
[0048] It should also be noted that, in the description of this specification, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.
[0049] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion, such that a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may also include other steps or units that are not explicitly listed or that are inherent to such processes, methods, products, or apparatus.
[0050] Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
[0051] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.
Claims
1. A heat-bending tempered glass film, characterized in that, include: Hot-bent glass substrate (100); A sandwich adhesive layer (110) is disposed on the lower surface of the hot-bent glass substrate (100) for bonding the hot-bent glass substrate (100) and the mobile phone screen. The sandwich adhesive layer (110) includes a high-transparency silicone coating layer (120), a first substrate layer (130), a silicone gel filling layer (140), a second substrate layer (150), and an OCA acrylic adhesive coating layer (160) disposed sequentially from top to bottom. An epoxy resin sealing layer (170) is used to seal the edges of the sandwich adhesive layer (110).
2. The hot-bending tempered glass film according to claim 1, characterized in that, The upper surface of the hot-bent glass substrate (100) is coated with an AF coating (180).
3. The hot-bending tempered glass film according to claim 1, characterized in that, The thickness of the hot-bent glass substrate (100) is 0.15mm-0.3mm.
4. The hot-bending tempered glass film according to claim 3, characterized in that, The edges of the hot-bent glass substrate (100) are polished to 0.1mm-0.2mm.
5. The hot-bending tempered glass film according to claim 1, characterized in that, The hot-bent glass substrate (100) is high-alumina silicate glass.
6. The hot-bending tempered glass film according to claim 1, characterized in that, The thickness of the high-transparency silicone coating (120) is 20±10μm.
7. The hot-bending tempered glass film according to claim 1, characterized in that, The thickness of the silica gel filling layer (140) is 25±10μm.
8. The hot-bending tempered glass film according to claim 1, characterized in that, The thickness of the OCA acrylic adhesive coating (160) is 50±10μm.
9. The hot-bending tempered glass film according to claim 1, characterized in that, The thickness of the first substrate layer (130) and the second substrate layer (150) is 25±10μm.
10. A hot-bending tempered glass film according to claim 1, characterized in that, Both the first substrate layer (130) and the second substrate layer (150) are made of PET material.