Electromagnetic shielding film

Abstract

The utility model relates to the field of electromagnetic shielding films, in particular to an electromagnetic shielding film, which comprises a multi-layer composite structure and is characterized in that the electromagnetic shielding film is formed by compounding at least four layers of materials, namely a base material layer 1, a conductive grid layer 2, an electromagnetic absorption layer 3 and a protective layer 4 in sequence; the base material layer 1 adopts a light high-strength polymer film as a substrate and has excellent flexibility and mechanical strength; the conductive grid layer 2 is located on the base material layer 1, is of a grid structure formed by fine metal wires or high-conductivity polymer fibers, is formed through a precise weaving or printing technology and is used for guiding and dispersing electromagnetic wave energy; the technical problem that the service life and the shielding effect of the electromagnetic shielding film are affected due to the fact that the electromagnetic shielding film is prone to abrasion, scraping and the like in the long-term use process is solved.

Description

Technical Field

[0001] This utility model relates to the field of shielding films, and in particular to an electromagnetic shielding film. Background Technology

[0002] With the widespread use of electronic devices and the development of wireless communication technology, electromagnetic radiation has become an increasingly prominent concern. Electromagnetic radiation can not only potentially harm users' health but also interfere with the normal operation of electronic devices, leading to data loss or equipment malfunction. Therefore, developing a highly efficient, transparent, and durable electromagnetic shielding film is of great significance.

[0003] Most existing electromagnetic shielding films employ single-layer or simple multi-layer structures, resulting in limited shielding effectiveness and often sacrificing transparency and optical performance. Furthermore, some electromagnetic shielding films are prone to wear and scratches during long-term use, affecting their lifespan and shielding effectiveness. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the defects of the prior art and provide an electromagnetic shielding film, which aims to solve the above-mentioned technical problems.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0006] include:

[0007] Multi-layer composite structure: The electromagnetic shielding film is composed of at least four layers of materials, namely, a substrate layer, a conductive mesh layer, an electromagnetic absorption layer, and a protective layer.

[0008] Substrate layer: A lightweight, high-strength polymer film is used as the substrate, which has excellent flexibility and mechanical strength;

[0009] Conductive mesh layer: Located above the substrate layer, it is a mesh structure made of fine metal wires or highly conductive polymer fibers, formed by precision weaving or printing technology, and is used to guide and disperse electromagnetic wave energy.

[0010] Electromagnetic absorption layer: Covering the conductive mesh layer, it is composed of polymer composite materials containing ferrite particles or carbon nanotubes and can effectively absorb electromagnetic waves in a specific frequency band.

[0011] Protective layer: Located above the electromagnetic absorption layer, it is a transparent, wear-resistant, and scratch-resistant polymer film used to protect the underlying structure from external damage.

[0012] As a preferred embodiment of this invention, the diameter of the metal wires or highly conductive polymer fibers in the conductive mesh layer is between one and one micrometer.

[0013] As a preferred technical solution of this utility model, the ferrite particles or carbon nanotubes in the electromagnetic absorption layer are uniformly dispersed in the polymer matrix by chemical or physical methods to form a continuous absorption network, and its absorption performance can be optimized by adjusting the concentration and type of particles or fibers.

[0014] As a preferred technical solution of this utility model, the surface of the protective layer is treated with anti-reflection to reduce the reflection of light on the surface, improve visual clarity and reduce glare.

[0015] As a preferred embodiment of the present invention, it further includes an adhesive layer located below the substrate layer, which is used to enhance the adhesion between the electromagnetic shielding film and the surface of the object to be shielded. The adhesive layer is made of a removable or permanent adhesive.

[0016] As a preferred embodiment of this utility model, the electromagnetic shielding film further includes a scratch-resistant layer located above the protective layer. The scratch-resistant layer is composed of inorganic materials or organic-inorganic composite materials with high hardness and good wear resistance, which is used to further enhance the durability of the film.

[0017] As a preferred technical solution of this utility model, the electromagnetic shielding film is manufactured by using a precise lamination technique to tightly bond the materials of each layer, ensuring the stability of the overall structure and the shielding effect.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] This invention's electromagnetic shielding film achieves highly efficient shielding of electromagnetic waves through a multi-layered composite structure and the selection and design of specific materials, while maintaining good transparency and optical performance. The addition of an adhesion layer 5 and an anti-scratch layer 6 enhances the film's durability and adaptability, improving its service life and shielding effectiveness. This electromagnetic shielding film is suitable for various electronic devices and has broad application prospects and market demand. Attached Figure Description

[0020] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0021] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0022] In the diagram: 1. Substrate layer; 2. Conductive mesh layer; 3. Electromagnetic absorption layer; 4. Protective layer; 5. Adhesive layer; 6. Anti-scratch layer. Detailed Implementation

[0023] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0024] In the attached diagram, all identical reference numerals refer to the same components.

[0025] Example 1

[0026] like Figure 1 As shown, this utility model provides an electromagnetic shielding film, comprising:

[0027] Example 1

[0028] An electromagnetic shielding film includes a substrate layer 1, a conductive mesh layer 2, an electromagnetic absorption layer 3, and a protective layer 4. The substrate layer 1 uses a lightweight, high-strength polymer film as a base, such as polyethylene terephthalate (PET) or polyimide (PI), which possesses excellent flexibility and mechanical strength. The conductive mesh layer 2 is a mesh structure composed of fine metal wires or highly conductive polymer fibers, formed through precision weaving or printing techniques, used to guide and disperse electromagnetic wave energy. The electromagnetic absorption layer 3 is composed of a polymer composite material containing ferrite particles or carbon nanotubes, capable of effectively absorbing electromagnetic waves in specific frequency bands. The protective layer 4 is a transparent, wear-resistant, and scratch-resistant polymer film, such as polycarbonate (PC) or polyethylene naphthalate (PEN), used to protect the underlying structure from external damage.

[0029] Example 2

[0030] Based on Example 1, the electromagnetic shielding film further includes an adhesion layer 5 located below the substrate layer 1 to enhance the adhesion between the electromagnetic shielding film and the surface of the object to be shielded. The adhesion layer 5 is made of a removable or permanent adhesive, such as an acrylic adhesive or a silicone adhesive, to meet the needs of different application scenarios.

[0031] Example 3

[0032] Based on Example 1 or Example 2, the electromagnetic shielding film further includes an anti-scratch layer 6 located above the protective layer 4. The anti-scratch layer 6 is composed of inorganic materials or organic-inorganic composite materials with high hardness and good wear resistance, such as silicon dioxide, alumina, or polytetrafluoroethylene, to further enhance the durability of the film.

[0033] Example 4

[0034] Based on any one of Examples 1 to 3, during the manufacturing process of the electromagnetic shielding film, the various layers of materials are tightly bonded together using precise lamination technology to ensure the stability of the overall structure and the shielding effect. Lamination technology can employ methods such as hot pressing, cold pressing, or ultrasonic pressing; the specific choice depends on the properties of the materials and the required process conditions.

[0035] Example 5

[0036] An application method for an electromagnetic shielding film involves attaching the electromagnetic shielding film described in any one of Examples 1 to 4 above to the surface of an electronic device requiring electromagnetic protection, such as a smartphone, tablet computer, laptop computer, automotive electronic components, smart home devices, or medical electronic instruments. By adjusting parameters such as the grid density and shape of the conductive grid layer 2 and the material and concentration of the electromagnetic absorption layer 3, efficient shielding of electromagnetic waves of different frequency bands can be achieved.

[0037] In summary, the electromagnetic shielding film of this invention achieves efficient shielding of electromagnetic waves through a multi-layer composite structure and the selection and design of specific materials, while maintaining good transparency and optical performance.

[0038] By adding an adhesion layer 5 and an anti-scratch layer 6, the durability and adaptability of the membrane are enhanced, and its service life and shielding effect are improved.

[0039] This electromagnetic shielding film is suitable for a variety of electronic devices and has broad application prospects and market demand.

[0040] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model 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 this utility model should be included within the protection scope of this utility model.

Claims

1. An electromagnetic shielding film, characterized in that, include: Multi-layer composite structure: The electromagnetic shielding film is composed of at least four layers of materials, namely, a substrate layer (1), a conductive mesh layer (2), an electromagnetic absorption layer (3), and a protective layer (4); Substrate layer (1): A lightweight and high-strength polymer film is used as the substrate, which has excellent flexibility and mechanical strength; Conductive mesh layer (2): Located above the substrate layer (1), it is a mesh structure made of fine metal wires or highly conductive polymer fibers, formed by precision weaving or printing technology, and is used to guide and disperse electromagnetic wave energy. Electromagnetic absorption layer (3): Covered on the conductive grid layer (2), it is composed of a polymer composite material containing ferrite particles or carbon nanotubes, which can effectively absorb electromagnetic waves in a specific frequency band. Protective layer (4): Located above the electromagnetic absorption layer (3), it is a transparent, wear-resistant, and scratch-resistant polymer film used to protect the underlying structure from external damage.

2. The electromagnetic shielding film according to claim 1, characterized in that, The diameter of the metal wires or highly conductive polymer fibers in the conductive mesh layer (2) is between 5 and 50 micrometers.

3. The electromagnetic shielding film according to claim 1, characterized in that, The ferrite particles or carbon nanotubes in the electromagnetic absorption layer (3) are uniformly dispersed in the polymer matrix by chemical or physical methods to form a continuous absorption network. Its absorption performance can be optimized by adjusting the concentration and type of particles or fibers.

4. The electromagnetic shielding film according to claim 1, characterized in that, The surface of the protective layer (4) is treated with an anti-reflective coating to reduce light reflection on the surface, improve visual clarity and reduce glare.

5. The electromagnetic shielding film according to claim 1, characterized in that, It also includes an adhesive layer (5) located below the substrate layer (1) to enhance the adhesion between the electromagnetic shielding film and the surface of the object to be shielded, the adhesive layer (5) being made of a removable or permanent adhesive.

6. The electromagnetic shielding film according to claim 1, characterized in that, The electromagnetic shielding film also includes a scratch-resistant layer (6) located above the protective layer (4). The scratch-resistant layer (6) is made of inorganic materials or organic-inorganic composite materials with high hardness and good wear resistance, which is used to further enhance the durability of the film.

7. The electromagnetic shielding film according to any one of claims 1 to 6, characterized in that, During the manufacturing process, the electromagnetic shielding film uses precise lamination technology to tightly bond the various layers of materials, ensuring the stability of the overall structure and the shielding effect.

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