3D hot-bending full-laminated protective film

Abstract

The utility model discloses a 3D hot bending full pasting protection film, including by upper to lower setting's protection layer, use layer, AB double -faced adhesive layer and double -faced adhesive release layer, the edge of protection layer is compounded with composite material edge, and the single -edged extension length of composite material edge is greater than use layer, and the composite material edge has extension edge release film or use layer extension die cutting surplus material, after use layer central pasting in protection layer, the composite material edge with extension edge release film or use layer extension die cutting surplus material is carried out hot bending stretch forming, makes composite material edge hot bending arc stretch zone limit setting use layer edge arc, to realize use layer's 3D hot bending arc consistent. The utility model discloses through to the accurate matching of composite material edge hot bending stretch forming realization use layer and screen arc, through the limit setting of composite material edge, and use layer even stretch in the hot bending process, avoid local deformation, prevent the deformation and stress uneven in the hot bending process simultaneously, improve product reliability and production efficiency.

Description

Technical Field

[0001] This utility model relates to the field of protective film technology, and in particular to a 3D heat-bending fully laminated protective film for 2.5D or 2D display screens. This 3D heat-bending fully laminated protective film achieves a perfect match with the screen curvature through a unique layered structure and heat-bending process, providing a high degree of adhesion, bubble-free, and uniform curvature protection. This utility model is especially suitable for screen protection of consumer electronics products such as smartphones, tablets, and smartwatches, solving problems such as poor adhesion, edge lifting, and visual distortion caused by mismatched curvature in traditional protective films. Background Technology

[0002] In the electronics industry, there are currently two common types of screens: 2.5D or 2D screens and 3D curved screens. To protect the display screen, 3D curved screen protectors are made by hot bending the material and then attaching it to the 3D screen with AB double-sided adhesive. 2.5D or 2D screens typically use flat protective films, such as flat tempered glass films or flat plastic polymer material protective films, which are attached to the display screen with AB double-sided adhesive or by applying glue to the material to achieve the same protective effect.

[0003] For 2.5D or 2D small-curvature display screens, the currently common technology has the following drawbacks:

[0004] 1. Fully transparent screen protectors need to be recessed in size and cannot cover or protect the edges of the screen.

[0005] 2. Although protective films with printed borders can be larger in size and coverage, they do not adhere completely at the 2.5D curved edges, which can easily cause white edges to rebound.

[0006] 3. Consumers experience a noticeable scratchy feeling when touching the edge of the screen, which affects the user experience.

[0007] 4. From an aesthetic point of view, the protective film with a 3D feel achieved through hot bending at the edges has a more visually impactful effect.

[0008] For 3D curved display screens, the market already has relatively mature hot bending processes and products for both glass and plastic polymer materials. For 2.5D display screens, the market also has relatively mature processes and products for hot bending glass materials with small curvature edges and then bonding them with AB double-sided adhesive. However, for plastic polymer material protective films for 2.5D or 2D display screens, there is currently no relatively mature processing technology or solution for small curvature hot bending. Utility Model Content

[0009] The purpose of this invention is to provide a 3D hot-bending fully laminated protective film to solve the problems mentioned in the background art.

[0010] To achieve the above objectives, this utility model provides the following technical solution: a 3D hot-bending fully laminated protective film, comprising: a protective layer, a service layer, an AB double-sided adhesive layer, and a double-sided adhesive release layer arranged sequentially from top to bottom; the edge of the protective layer is laminated with a composite material edge, the single-sided extension length of the composite material edge is greater than that of the service layer, and the composite material edge has an extension edge release film or extension die-cutting surplus of the service layer; after the service layer is centered and laminated to the protective layer, the composite material edge with the extension edge release film or extension die-cutting surplus of the service layer is hot-bent and stretched to form a curved shape, so that the hot-bending curvature stretching area of ​​the composite material edge limits and shapes the curvature of the edge of the service layer, so as to achieve a consistent 3D hot-bending curvature of the service layer.

[0011] Furthermore, the edges of the composite material are made using the leftover material from the protective layer or the working layer.

[0012] Furthermore, the single-sided extension length of the composite material edge is 0.1mm-50mm.

[0013] Furthermore, the temperature during hot bending of the composite material is ≤130℃.

[0014] Furthermore, during hot bending, a heat-bending protective film is applied.

[0015] Furthermore, the composite material is bonded to the two opposite long sides of the protective layer.

[0016] Furthermore, the composite material is applied to the edges of the protective layer.

[0017] Furthermore, the layer is made of a plastic polymer material.

[0018] Furthermore, the plastic polymer material is one or more of polyethylene terephthalate, polycarbonate, or polymethyl methacrylate.

[0019] Furthermore, the 3D thermal bending curvature of the layer is matched with the curvature of the 2.5D or 2D display screen.

[0020] The beneficial effects of this utility model are as follows:

[0021] 1. The protective layer, the usable layer, the AB double-sided adhesive layer, and the double-sided adhesive release layer are sequentially arranged from top to bottom. The edge of the protective layer is laminated with a composite material edge, the single-sided extension length of which is greater than that of the usable layer, and has an extension edge release film or die-cut surplus of the usable layer extension. After the usable layer is centered and bonded to the protective layer, the composite material edge with the extension edge release film is hot-bent and stretched to form a shape. This limits and shapes the curvature of the usable layer edge in the hot-bending curvature stretching area, thereby ensuring that the thickness and curvature of the usable layer's curved edge remain uniform after hot bending, achieving 3D hot-bending curvature consistency of the usable layer. This D-type hot-bending fully laminated protective film has a simple structure and is highly efficient to manufacture. By hot-bending and stretching the composite material edge, the curvature of the usable layer and the screen are precisely matched. Through the limiting and shaping of the composite material edge, the usable layer is stretched uniformly during the hot bending process, avoiding local deformation and preventing deformation and uneven stress during the hot bending process, thus improving product reliability and production efficiency.

[0022] 2. High consistency of hot bending curvature, minimizing the problem of inconsistent hot bending size and arc height caused by process defects.

[0023] 3. The finished product has a full curve and is aesthetically pleasing.

[0024] 4. The product has high flatness, making it highly operable for screen fitting.

[0025] 5. High overall consistency in hot bending also greatly avoids abnormalities such as white edges and rebound after bonding to the screen. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the 3D hot-bending fully laminated protective film of this utility model after bending and forming.

[0027] Figure 2 This is a schematic diagram showing the bonding of the protective layer, the service layer, and the heat-bending protective film in this utility model. Detailed Implementation

[0028] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0029] Please see Figure 1 and Figure 2This embodiment provides a 3D hot-bending fully laminated protective film, which includes a protective layer 10, a service layer 20, an AB double-sided adhesive layer 30, and a double-sided adhesive release layer 40 arranged sequentially from top to bottom. Depending on requirements, a composite material edge 50 can be laminated to the two opposite long sides of the protective layer 10 or to the four edges of the protective layer 10. The single-sided extension length of the composite material edge 50 is greater than that of the service layer 20. That is, the outer dimensions of the protective layer 10 are larger on one side than the final outer dimensions of the service layer 20. The single-sided extension length of the composite material edge 50 is 0.1mm-50mm, enabling the use layer 20 to achieve circumferential stretching and outer dimension limitation during subsequent hot bending.

[0030] After the layer 20 is centered and bonded to the protective layer 10, the composite material edge 50 with the extended edge release film 51 or the excess material from the extended die-cutting of the layer is placed into a graphite mold for hot bending. The graphite mold presses the extended edge of the composite material edge 50, limiting and shaping the edge curvature of the layer 20 in the hot bending curvature stretching area. This ensures that the thickness and curvature of the curved edge of the layer 20 remain uniform after hot bending, achieving 3D hot bending curvature consistency of the layer 20. This allows the 3D hot bending curvature of the layer 20 to match the curvature of the 2.5D or 2D display screen, greatly avoiding abnormal problems such as white edges and rebound after bonding to the screen. To avoid air bubbles and damage to the layer 20 material after hot bending, the hot bending temperature needs to be controlled below 130℃.

[0031] In this embodiment, the composite material edge 50 is made from the leftover material of the protective layer 10 or the working layer 20. This manufacturing method not only effectively utilizes materials and reduces waste, but also ensures the consistency of the composite material edge 50 with the protective layer 10 or the working layer 20 in terms of material, thereby improving the performance of the entire 3D hot-bending fully laminated protective film. In actual operation, the shape and size of the composite material edge 50 can be flexibly designed according to the shape and size of the leftover material of the protective layer 10 or the working layer 20 to meet the needs of different 3D hot-bending curvatures.

[0032] In this embodiment, layer 20 is made of a plastic polymer material, which can be one or more of polyethylene terephthalate, polycarbonate, or polymethyl methacrylate. These materials all possess good plasticity, transparency, and stability, meeting the performance requirements of layer 20 during the 3D hot bending process. The use of the plastic polymer material allows layer 20 to better conform to the mold during hot bending, forming the required 3D curvature while maintaining its original physical and chemical properties. Furthermore, these materials also have good wear and scratch resistance, effectively protecting the screen from external damage.

[0033] To prevent scratches and dents on the use layer 20 during hot bending, a heat-bending protective film 21 is applied to it. After hot bending, the protective film 21 is removed, and then the AB double-sided adhesive layer 30 is applied. The protective film 21 provides an extra layer of protection for the use layer 20 during the hot bending process. This protective film 21 is typically made of a material with good flexibility and high-temperature resistance to ensure it will not deform or be damaged by high temperatures during hot bending, while effectively resisting scratches and dents. After hot bending, the protective film 21 can be easily peeled off without leaving any marks on the surface of the use layer 20, ensuring its integrity and aesthetics.

[0034] In summary, the manufacturing process of this 3D hot-bending fully laminated protective film is as follows:

[0035] Step 1: Use Layer 20 to form the shape using a die-cutting tool or a CNC engraving machine. Die-cutting is suitable for standard shapes, such as rectangles or circles, using a precision die to ensure burr-free edges. CNC engraving is used for complex curved surfaces or high-precision requirements, using computer-controlled engraving paths to achieve a forming accuracy of ±0.05mm. The size of Layer 20 is designed according to the target screen. After forming, the surface of Layer 20 needs to be cleaned to remove dust and debris.

[0036] Step 2: The protective layer 10 is also die-cut, but its outer dimensions are larger than those of the usable layer 20. The single-sided extension length is set according to the screen curvature; for example, for a 2.5D screen, the extension length is 2mm to 5mm. During the forming of the protective layer 10, the release film in the middle is removed, while the outer release film is retained. This design prevents the adhesive surface from being exposed and contaminated, while also assisting in the curvature forming during hot bending. The dimensional tolerance of the protective layer 10 is controlled within ±0.1mm to ensure alignment accuracy with the usable layer 20.

[0037] Step 3: Center the use layer 20 and attach it to the bottom of the protective layer 10. Composite material edge 50 is then applied to the edge of the protective layer 10, so that the protective layer 10 forms a composite material that is larger than the use layer 20 and is ready for heat bending. The single-sided extension dimension of the composite material edge 50 is between 0.1mm and 50mm.

[0038] Step 4: The composite material is hot-bent using a graphite mold. The graphite mold presses the edge 50 of the composite material tightly. To avoid air bubbles and damage to the material of the working layer 20 after hot bending, the hot bending temperature needs to be controlled below 130℃. During the hot bending process, the edge 50 of the composite material is stretched by heat, and its extended part forms an arc stretching zone, which limits and shapes the edge of the working layer 20, making the overall arc of the working layer 20 consistent. At the same time, the hot bending protective film 21 attached to the working layer 20 prevents damage or oxidation.

[0039] Step 5: Apply another AB double-sided adhesive tape under the heat-bent layer 20 so that it can be attached to the desired display screen later.

[0040] It should be noted that when bonding Step 1 and Step 2, the release film in the middle part of the heat bending protective layer 10 in Step 2 needs to be removed. The outer release film (i.e., the extended edge release film 51) in Step 2 is retained to prevent the adhesive surface of the protective layer 10 from being exposed, and together with the protective layer 10, it helps to ensure the consistency of the curvature forming of the layer 20 during the heat bending process.

[0041] In addition, when applying the AB double-sided adhesive to the application layer 20 in step five, it is necessary to simultaneously peel off the heat bending protective film 21 of the application layer 20 and the double-sided adhesive release layer 40 of the AB double-sided adhesive.

[0042] It should be noted that steps one, two, and three above can also be performed by directly laminating the working layer 20 and the protective layer 10 together and then die-cutting them. The edge material of the protective layer 10 after forming (i.e., the composite material edge 50) is 0.1 to 50 mm larger than the working layer 20 on one side. In other words, the extended edge of the protective layer 10 is used as the composite material edge 50 to create a single protective layer 10 with an outer dimension larger than the working layer 20.

[0043] In summary, by sequentially arranging a protective layer 10, a service layer 20, an AB double-sided adhesive layer 30, and a double-sided adhesive release layer 40 from top to bottom, the protective layer 10 has a composite material edge 50 bonded to its edge. The single-sided extension length of this composite material edge 50 is greater than that of the service layer 20, and it has an extension edge release film 51 or a die-cut residue from the service layer extension. After the service layer 20 is centrally bonded to the protective layer 10, the composite material edge 50 with the extension edge release film 51 or the die-cut residue from the service layer extension is hot-bent and stretched to limit the hot-bent arc stretching area of ​​the composite material edge 50. The edge curvature of the 20 layer is shaped to ensure uniform thickness and curvature of the 20 layer after hot bending, achieving 3D hot bending curvature consistency of the 20 layer. This 3D hot bending fully laminated protective film has a simple structure and is highly efficient to manufacture. By hot bending and stretching the composite material edge 50, the curvature of the 20 layer is precisely matched with that of the screen. Through the limiting and shaping of the composite material edge 50, the 20 layer is stretched evenly during the hot bending process, avoiding local deformation and preventing deformation and uneven stress during the hot bending process, thereby improving product reliability and production efficiency.

[0044] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

Claims

1. A 3D heat-bending fully laminated protective film, characterized in that, include: The layers are arranged from top to bottom as follows: protective layer, service layer, AB double-sided adhesive layer, and double-sided adhesive release layer; The protective layer has a composite material edge, and the single-sided extension length of the composite material edge is greater than that of the use layer. The composite material edge has an extension edge release film or the use layer extension die-cutting surplus. After the use layer is centered and attached to the protective layer, the composite material edge with the extension edge release film or the use layer extension die-cutting surplus is hot-bent and stretched to limit and shape the curvature of the use layer edge in the hot bending curvature stretching area of ​​the composite material edge, so as to achieve a consistent 3D hot bending curvature of the use layer.

2. The 3D hot-bending fully laminated protective film according to claim 1, characterized in that, The edges of the composite material are made from the leftover material of the protective layer or the working layer.

3. The 3D hot-bending fully laminated protective film according to claim 1, characterized in that, The single-sided extension length of the composite material edge is 0.1mm-50mm.

4. The 3D hot-bending fully laminated protective film according to claim 1, characterized in that, The temperature during hot bending of composite materials is ≤130℃.

5. The 3D hot-bending fully laminated protective film according to claim 1, characterized in that, When hot bending, a heat bending protective film is applied.

6. The 3D hot-bending fully laminated protective film according to claim 1, characterized in that, The composite material is bonded to the two long sides of the protective layer.

7. The 3D hot-bending fully laminated protective film according to claim 1, characterized in that, The composite material is bonded to the edges of the protective layer.

8. The 3D hot-bending fully laminated protective film according to claim 1, characterized in that, The working layer is made of a plastic polymer material.

9. The 3D hot-bending fully laminated protective film according to claim 1, characterized in that, Use the 3D thermal bending curvature of the layer to match the curvature of the 2.5D or 2D display screen.

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