Electromagnetic shielding sheet and railway vehicle electric appliance cabinet with same

Abstract

The utility model provides an electromagnetic shielding sheet and a railway vehicle electric appliance cabinet with the same. The electromagnetic shielding sheet comprises, in order: a polyester base film; a copper foil having a thickness in the range of 50 [mu] m to 200 [mu] m; a polyvinyl alcohol film having a thickness in the range of 20 [mu] m to 100 [mu] m; a nickel foil having a thickness in the range of 30 [mu] m to 70 [mu] m; a polyolefin layer; and a first pressure sensitive adhesive layer. The electromagnetic shielding sheet is used for being adhered to the inner surface and the outer surface of the electrical cabinet of the railway vehicle or simultaneously adhered to the inner surface and the outer surface of the electrical cabinet of the railway vehicle, and can provide excellent electromagnetic shielding performance for the electrical cabinet.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of electromagnetic shielding of rail vehicle electric appliance cabinet, in particular to an electromagnetic shielding sheet and a rail vehicle electric appliance cabinet with the electromagnetic shielding sheet. BACKGROUND

[0002] In the electric appliance cabinet of the rail vehicle, numerous precise electronic components and complex circuit systems have extremely strict requirements for the electromagnetic environment. On the one hand, if the electromagnetic radiation inside the electric appliance cabinet leaks into the surrounding space, it may interfere with the normal operation of other systems (such as communication systems, signal systems, etc.) of the vehicle, leading to signal distortion, communication interruption, even control failure and other serious problems, endangering the safe operation of the rail vehicle. On the other hand, if the external electromagnetic interference (such as electromagnetic signals from nearby high-voltage lines, other electrical equipment and wireless communication equipment, etc.) enters the electric appliance cabinet, it will affect the working stability of the internal electronic components, reduce their performance, shorten their service life, increase the probability of equipment failure, and thus affect the reliability and operational efficiency of the rail vehicle.

[0003] Traditional electromagnetic shielding methods mainly include using a metal shell or coating conductive paint on the surface of the cabinet. However, the metal shell often has the disadvantages of heavy weight, high cost, inconvenient processing, and is not conducive to heat dissipation of the internal equipment of the electric appliance cabinet. The shielding effectiveness of conductive paint is relatively limited, and its durability and uniformity are difficult to guarantee in the long-term complex rail vehicle operating environment. In addition, some existing electromagnetic shielding materials have deficiencies in flexibility, adhesion, and adaptability to the electric appliance cabinet of the rail vehicle, and cannot meet the requirements of electromagnetic shielding performance of the rail vehicle under special working conditions such as high-speed operation, frequent vibration, large temperature and humidity changes, etc. For example, strong vibration during vehicle driving may cause the traditional shielding material to peel off or produce gaps on the surface of the electric appliance cabinet, thus greatly reducing the electromagnetic shielding effect.

[0004] Therefore, there is an urgent need for a new type of electromagnetic shielding sheet that can effectively overcome the above-mentioned deficiencies of the prior art, has the characteristics of light weight, high shielding effectiveness, good flexibility, strong adhesion, excellent environmental resistance, and good adaptability to the electric appliance cabinet of the rail vehicle, etc., thereby providing reliable electromagnetic shielding protection for the electric appliance cabinet of the rail vehicle, ensuring the stable operation of the electrical system of the rail vehicle and the improvement of the overall performance. SUMMARY

[0005] From the above-mentioned technical problems, one of the purposes of the utility model is to provide an electromagnetic shielding sheet and a rail vehicle electric appliance cabinet with the electromagnetic shielding sheet, which is used for pasting on the inner surface, outer surface or both inner and outer surfaces of the electric appliance cabinet of the rail vehicle, and can provide excellent electromagnetic shielding performance for the electric appliance cabinet.

[0006] In particular, according to one aspect of the present application, there is provided an electromagnetic shielding sheet material comprising, in order:

[0007] a polyester base film;

[0008] a copper foil having a thickness in the range of 50 to 200 pm;

[0009] a polyvinyl alcohol film having a thickness in the range of 20 to 100 pm;

[0010] a nickel foil having a thickness in the range of 30 to 70 pm;

[0011] a polyolefin layer; and

[0012] a first pressure sensitive adhesive layer.

[0013] According to another aspect of the present application, there is provided a rolling stock electrical cabinet having the electromagnetic shielding sheet material described above. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 shows a cross-sectional view of an electromagnetic shielding sheet material according to one embodiment of the present application;

[0015] Figure 2 shows a cross-sectional view of an electromagnetic shielding sheet material according to another embodiment of the present application; and

[0016] Figure 3 shows a cross-sectional view of an electromagnetic shielding sheet material according to yet another embodiment of the present application. DETAILED DESCRIPTION

[0017] The present application will be described in further detail below with reference to the accompanying drawings and specific embodiments. It will be appreciated that other embodiments can be implemented without departing from the scope or spirit of the present application. Accordingly, the following detailed description is non-limiting.

[0018] Unless otherwise indicated, all numbers expressing feature sizes, amounts and other numerical values used in the specification and claims are to be understood as being modified in all instances by the term "about." Accordingly, unless indicated to the contrary, the numerical parameters set forth in the foregoing description and attached claims are approximations that can vary depending upon the desired properties sought to be obtained by those skilled in the art utilizing the teachings of the present disclosure. At the very least, each numerical parameter should at least be construed in light of the number of reported significant digits and by applying ordinary rounding techniques. The mere fact that an amount, value or parameter is disclosed in the detailed description, and / or in the claims to accomplish a particular physical result, does not constitute an admission that a specific numerical parameter, value or amount is necessary to accomplish the physical result. Any numerical values recited herein include all values from the lower to the upper value. Any numerical value, however, can be expressed with a degree of precision by one skilled in the art to enable practitioners to recognize equivalence. Ranges can be expressed herein with endpoints understood to be "open" (unless otherwise specifically stated), and include all values and sub-ranges encompassed therein.

[0019] As described above, the utility model mainly solves the technical problem related to electromagnetic shielding of the electric appliance cabinet of the railway vehicle. There are many electrical equipment in the electric appliance cabinet, and the electromagnetic radiation leakage or interference from the outside will affect the operation of the vehicle system, the performance and the life of the components. The existing shielding methods such as metal shell and conductive paint have problems such as heavy weight, high cost, inconvenient processing, poor heat dissipation, limited shielding effectiveness, insufficient durability and uniformity, etc. And the existing shielding materials are poor in flexibility, adhesion and adaptability, which cannot meet the special working condition requirements of the railway vehicle. The utility model aims to provide a novel electromagnetic shielding sheet and an electric appliance cabinet of the railway vehicle with the electromagnetic shielding sheet. The inventors of the utility model found in the research that by specifically designing the electromagnetic shielding sheet structure with a laminated structure, an electromagnetic shielding sheet with excellent electromagnetic shielding performance can be provided.

[0020] Specifically, according to one aspect of the utility model, an electromagnetic shielding sheet is provided, which comprises in sequence:

[0021] a polyester base film;

[0022] a copper foil, the thickness of the copper foil being in the range of 50 μm to 200 μm;

[0023] a polyvinyl alcohol film, the thickness of the polyvinyl alcohol film being in the range of 20 μm to 100 μm;

[0024] a nickel foil, the thickness of the nickel foil being in the range of 30 μm to 70 μm;

[0025] a polyolefin layer; and

[0026] a first pressure-sensitive adhesive layer.

[0027] Figure 1 A cross-sectional view of the electromagnetic shielding sheet 100 according to one embodiment of the utility model is shown. In this embodiment, the electromagnetic shielding sheet 100 comprises in sequence a polyester base film 1, a copper foil 2, a polyvinyl alcohol film 3, a nickel foil 4, a polyolefin layer 5 and a first pressure-sensitive adhesive layer 6.

[0028] The polyester base film 1 serves as the base of the electromagnetic shielding sheet, and can provide good mechanical strength and dimensional stability for the electromagnetic shielding sheet. In this embodiment, the polyester base film 1 is preferably a polyethylene terephthalate (PET) base film, and the thickness thereof is in the range of 5 μm to 150 μm, more preferably in the range of 30 μm to 100 μm.

[0029] The copper foil 2 has good electrical conductivity and is an important electromagnetic shielding layer in the electromagnetic shielding sheet. The thickness of the copper foil 2 is in the range of 50 μm to 200 μm, more preferably in the range of 80 μm to 150 μm.

[0030] According to some preferred embodiments of the present application, the copper foil 2 has copper particles (not shown) uniformly dispersed on the surface facing the polyvinyl alcohol film 3, the average particle size of the copper particles is in the range of 20-50 nm, preferably 30-40 nm, and the copper particles cover 40-70%, preferably 40-65% of the total surface area of the copper foil 2. The inventors of the present application have found in their research that these copper particles can further significantly improve the electromagnetic shielding performance of the copper foil, without being bound by theory, it is believed that by increasing the reflection and scattering of electromagnetic waves on the surface of the copper foil, the penetration of electromagnetic waves is reduced.

[0031] The polyvinyl alcohol film 3 is located between the copper foil 2 and the nickel foil 4, and has a thickness in the range of 20-100 μm, preferably in the range of 40-80 μm. The polyvinyl alcohol film 3 has good flexibility and adhesion, and can effectively buffer the stress generated between the copper foil 2 and the nickel foil 4 due to the difference in the coefficient of thermal expansion, while helping to improve the structural stability of the entire electromagnetic shielding sheet. In addition, the polyvinyl alcohol film 3 has a weight average molecular weight in the range of 10,000-200,000, and a suitable molecular weight helps to further improve its performance.

[0032] The thickness of the nickel foil 4 is in the range of 30-70 μm, preferably in the range of 40-60 μm. The nickel foil 4 has a high magnetic permeability, and when used in combination with the copper foil 2, it can effectively shield low and high frequency electromagnetic waves, improving the overall shielding effectiveness of the electromagnetic shielding sheet.

[0033] The polyolefin layer 5 can provide some protection for the electromagnetic shielding sheet, preventing damage to the internal structure from the external environment. The polyolefin layer 5 can be a polyethylene layer or a polypropylene layer, and has a thickness in the range of 20-200 μm, more preferably in the range of 50-150 μm.

[0034] The first pressure-sensitive adhesive layer 6 is used to adhere the electromagnetic shielding sheet to the surface of the electrical cabinet of the railway vehicle, and has a thickness in the range of 10-200 μm, preferably in the range of 30-150 μm. The first pressure-sensitive adhesive layer 6 can be a rubber-type pressure-sensitive adhesive layer, a resin-type pressure-sensitive adhesive layer, or a silicone pressure-sensitive adhesive layer, etc. These types of pressure-sensitive adhesives have good adhesion, flexibility and weather resistance, and can ensure that the electromagnetic shielding sheet is firmly adhered to the surface of the electrical cabinet under complex environments during the operation of the railway vehicle (such as high-speed driving, frequent vibration, large temperature and humidity changes, etc.), while maintaining good electromagnetic shielding performance.

[0035] Each of the materials used in the above specific embodiments can be commercially available or prepared according to known methods. In the manufacture of the electromagnetic shielding sheet according to the above embodiments, the various materials in the stack can be combined together by a conventional hot pressing method in the art.

[0036] Figure 2 A cross-sectional view of the electromagnetic shielding sheet 100 according to another embodiment of the present application is shown. As shown, the polyester base film 1, the copper foil 2, the polyvinyl alcohol film 3, the nickel foil 4, and the polyolefin layer 5 are sequentially bonded together by the second pressure-sensitive adhesive layer 7. The thickness of the second pressure-sensitive adhesive layer 7 is in the range of 10 μm to 200 μm, preferably in the range of 30 μm to 100 μm, and its type can also be a rubber type pressure-sensitive adhesive layer, a resin type pressure-sensitive adhesive layer, or a silicone pressure-sensitive adhesive layer, etc. By providing the second pressure-sensitive adhesive layer 7, the bonding strength between the layers can be further enhanced, and the overall structural stability of the electromagnetic shielding sheet can be improved. Figure 2

[0037] Each of the materials used in the above specific embodiments can be commercially available or prepared according to known methods. In the manufacture of the electromagnetic shielding sheet according to the above embodiments, the sequentially stacked polyester base film 1, copper foil 2, polyvinyl alcohol film 3, nickel foil 4, and polyolefin layer 5 can be bonded together by a method of bonding by a conventional pressure-sensitive adhesive in the art, which corresponds to the second pressure-sensitive adhesive layer 7.

[0038] In yet another embodiment, as shown in Figure 3 The electromagnetic shielding sheet 100 further comprises a release layer 8 attached to the first pressure-sensitive adhesive layer 6. The function of the release layer 8 is to protect the first pressure-sensitive adhesive layer 6 when the electromagnetic shielding sheet is not in use, preventing it from being contaminated or prematurely deactivated. When the electromagnetic shielding sheet is in use, the release layer 8 can be peeled off, and the electromagnetic shielding sheet can be attached to the surface of the electrical cabinet of the railway vehicle. The release layer 8 can be made of conventional release materials, such as release paper, silicone oil-coated polyester film, etc.

[0039] It is particularly noteworthy that according to the technical solution of the present application, a composite electromagnetic shielding sheet with a multi-layered structure of a copper foil with a specific thickness (50 μm-200 μm) + a polyvinyl alcohol film with a specific thickness (20 μm-100 μm) + a nickel foil with a specific thickness (30 μm-70 μm) is provided. The inventors of the present application have found in their research that by specifically selecting the copper foil + nickel foil bimetallic electromagnetic shielding layer and using a polyvinyl alcohol film to control the distance between the two metal films, the technical effect of significantly improving the electromagnetic shielding performance can be achieved. Compared with an electromagnetic shielding sheet using a copper foil with a specific thickness (50 μm-200 μm) as a metal shielding layer alone or an electromagnetic shielding sheet using a nickel foil with a specific thickness (30 μm-70 μm) as a metal shielding layer alone, the electromagnetic shielding performance can be improved by more than 5 times by using the specific copper foil + nickel foil bimetallic electromagnetic shielding layer structure designed in the present application, which is obviously beyond the expectation of the person skilled in the art.

[0040] ​The rail vehicle electrical cabinet has the electromagnetic shielding sheet material in the above embodiments. The electromagnetic shielding sheet material can be pasted to the inner surface, outer surface or both of the rail vehicle electrical cabinet.

[0041] When the electromagnetic shielding sheet material is pasted to the inner surface of the electrical cabinet, it can effectively prevent electromagnetic radiation inside the electrical cabinet from leaking to the surrounding space, avoiding interference with other systems of the vehicle. At the same time, it can also reduce electromagnetic interference between internal electronic components, improving the working stability and reliability of the electronic components.

[0042] When the electromagnetic shielding sheet material is pasted to the outer surface of the electrical cabinet, it is mainly used to block external electromagnetic interference from entering the electrical cabinet, protecting the internal electronic components from the external electromagnetic environment.

[0043] Pasting the electromagnetic shielding sheet material to both the inner and outer surfaces of the electrical cabinet can provide all-around electromagnetic shielding protection, maximizing the stable operation of the electrical system of the rail vehicle.

[0044] In actual application, according to the specific structure of the rail vehicle electrical cabinet and the electromagnetic shielding requirements, a suitable electromagnetic shielding sheet material embodiment can be selected and pasted to the surface of the electrical cabinet using a suitable pasting process. For example, the surface of the electrical cabinet can be cleaned and pretreated first to ensure that the surface is flat, dry and free of oil stains, etc., and then the electromagnetic shielding sheet material can be pasted according to the predetermined position and direction, and the surface of the electrical cabinet can be fully adhered by applying appropriate pressure to ensure firm adhesion.

[0045] In summary, the electromagnetic shielding sheet material and the rail vehicle electrical cabinet with the electromagnetic shielding sheet material of the present application overcome the problems of large weight, low shielding effectiveness, poor flexibility, insufficient adhesion and poor environmental resistance of the electromagnetic shielding materials in the prior art through reasonable structural design and material selection. It can provide reliable electromagnetic shielding protection for the rail vehicle electrical cabinet, meet the electromagnetic shielding performance requirements of the rail vehicle under various special working conditions, and has significant practicality and promotional value.

[0046] Various exemplary embodiments of the present application are further illustrated by the following list of embodiments, which should not be interpreted as unduly limiting the present application:

[0047] Specific embodiment 1 is an electromagnetic shielding sheet material, characterized in that the electromagnetic shielding sheet material comprises, in order:

[0048] a polyester base film;

[0049] a copper foil, the thickness of the copper foil being in the range of 50 μm to 200 μm;

[0050] a polyvinyl alcohol film having a thickness in the range of 20 to 100 μm;

[0051] a nickel foil having a thickness in the range of 30 to 70 μm;

[0052] a polyolefin layer; and

[0053] a first pressure-sensitive adhesive layer.

[0054] Specific Embodiment 2 is the electromagnetic shielding sheet according to Specific Embodiment 1, characterized in that the copper foil has copper particles uniformly dispersed on a surface facing the polyvinyl alcohol film, wherein the average particle diameter of the copper particles is in the range of 20 to 50 nm, and the copper particles cover 40-70% of the total surface area of the copper foil.

[0055] Specific Embodiment 3 is the electromagnetic shielding sheet according to Specific Embodiment 1, characterized in that the polyester-based film is a polyethylene terephthalate (PET)-based film.

[0056] Specific Embodiment 4 is the electromagnetic shielding sheet according to Specific Embodiment 1, characterized in that the polyester-based film has a thickness in the range of 5 to 150 μm.

[0057] Specific Embodiment 5 is the electromagnetic shielding sheet according to Specific Embodiment 1, characterized in that the copper foil has a thickness in the range of 80 to 150 μm.

[0058] Specific Embodiment 6 is the electromagnetic shielding sheet according to Specific Embodiment 1, characterized in that the polyvinyl alcohol film has a weight average molecular weight in the range of 10,000 to 200,000.

[0059] Specific Embodiment 7 is the electromagnetic shielding sheet according to Specific Embodiment 1, characterized in that the polyolefin layer is a polyethylene layer or a polypropylene layer.

[0060] Specific Embodiment 8 is the electromagnetic shielding sheet according to Specific Embodiment 1, characterized in that the polyolefin layer has a thickness in the range of 20 to 200 μm.

[0061] Specific Embodiment 9 is the electromagnetic shielding sheet according to Specific Embodiment 1, characterized in that the first pressure-sensitive adhesive layer has a thickness in the range of 10 to 200 μm.

[0062] Specific Embodiment 10 is the electromagnetic shielding sheet according to Specific Embodiment 1, characterized in that the first pressure-sensitive adhesive layer is a rubber-type pressure-sensitive adhesive layer, a resin-type pressure-sensitive adhesive layer, or a silicone pressure-sensitive adhesive layer.

[0063] Specific embodiment 11 is the electromagnetic shielding sheet according to specific embodiment 1, characterized in that the polyester-based film, the copper foil, the polyvinyl alcohol film, the nickel foil, the polyolefin layer are sequentially bonded together by a second pressure-sensitive adhesive layer.

[0064] Specific embodiment 12 is the electromagnetic shielding sheet according to specific embodiment 11, characterized in that the thickness of the second pressure-sensitive adhesive layer is in the range of 10 μm to 200 μm.

[0065] Specific embodiment 13 is the electromagnetic shielding sheet according to specific embodiment 11, characterized in that the second pressure-sensitive adhesive layer is a rubber type pressure-sensitive adhesive layer, a resin type pressure-sensitive adhesive layer or a silicone pressure-sensitive adhesive layer.

[0066] Specific embodiment 14 is the electromagnetic shielding sheet according to specific embodiment 1, characterized in that the electromagnetic shielding sheet further comprises a release layer, which is attached to the first pressure-sensitive adhesive layer.

[0067] Specific embodiment 15 is a rail vehicle electrical cabinet, characterized in that the rail vehicle electrical cabinet has the electromagnetic shielding sheet according to any one of the preceding specific embodiments 1-14.

[0068] Specific embodiment 16 is the rail vehicle electrical cabinet according to specific embodiment 15, characterized in that the electromagnetic shielding sheet is attached to the inner surface, the outer surface or both the inner surface and the outer surface of the rail vehicle electrical cabinet.

[0069] Compared with the damping member in the prior art, the electromagnetic shielding sheet according to the utility model has the advantages that:

[0070] 1. Lightweight: The material combination (such as polyester-based film, copper foil, polyvinyl alcohol film, nickel foil, polyolefin layer and pressure-sensitive adhesive layer) of the electromagnetic shielding sheet of the utility model can achieve a significant reduction in weight compared to traditional metal shells.

[0071] 2. High shielding effectiveness: Through the specific design of the laminated structure, including the combination of copper foil and nickel foil, the electromagnetic shielding sheet of the utility model can provide better electromagnetic shielding performance, especially in the shielding of low-frequency and high-frequency electromagnetic waves.

[0072] 3. Flexibility and adhesion: The use of polyvinyl alcohol film provides good flexibility and adhesion, so that the electromagnetic shielding sheet can better adapt to the shape changes of the surface of the electrical cabinet and maintain stable adhesion under various working conditions.

[0073] 4. Environmental resistance: The electromagnetic shielding sheet of the present application has good environmental resistance and can maintain performance under special working conditions such as high-speed operation, frequent vibration, large temperature and humidity changes, etc.

[0074] 5. Structural stability: By using a pressure-sensitive adhesive layer, the electromagnetic shielding sheet can be firmly attached to the surface of the electrical cabinet under complex environments during the operation of the rail vehicle, while maintaining good electromagnetic shielding performance.

[0075] 6. Improve the stability and reliability of electronic components: By reducing electromagnetic interference between internal electronic components and preventing external electromagnetic interference from entering the electrical cabinet, the stability and reliability of electronic components are improved.

[0076] 7. All-around electromagnetic shielding protection: The electromagnetic shielding sheet can be attached to the inner surface, outer surface or both inner and outer surfaces of the electrical cabinet, providing all-around electromagnetic shielding protection.

[0077] 8. Adaptability: The electromagnetic shielding sheet of the present application can be well adapted to the electrical cabinet of the rail vehicle, meeting the requirements of electromagnetic shielding performance of the rail vehicle under various special working conditions.

[0078] 9. Improve electromagnetic shielding performance: Compared with the electromagnetic shielding sheet using copper foil or nickel foil alone, the specific copper foil + nickel foil bimetallic electromagnetic shielding layer structure designed in the present application can improve the electromagnetic shielding performance by more than 5 times.

[0079] Obviously, those skilled in the art can make various modifications and variations to the present disclosure without departing from the spirit and scope of the present disclosure. Thus, if these modifications and variations of the present disclosure fall within the scope of the claims of the present application and their equivalents, the present disclosure also intends to include these modifications and variations.

Claims

1. An electromagnetic shielding sheet, characterized by, The electromagnetic shielding sheet sequentially comprises: a polyester-based film; a copper foil having a thickness in the range of 50 to 200 μm; a polyvinyl alcohol film having a thickness in the range of 20 to 100 μm; a nickel foil having a thickness in the range of 30 to 70 μm; a polyolefin layer; and a first pressure-sensitive adhesive layer.

2. The electromagnetic shielding sheet according to claim 1, characterized by The copper foil has copper particles uniformly dispersed on a surface facing the polyvinyl alcohol film, wherein the copper particles have an average particle diameter in the range of 20 to 50 nm, and the copper particles cover 40-70% of the total surface area of the copper foil. 3.The electromagnetic shielding sheet according to claim 1, wherein: the polyester-based film is a polyethylene terephthalate-based film, or the polyester-based film has a thickness in the range of 5 to 150 μm. 4.The electromagnetic shielding sheet according to claim 1, wherein: the polyvinyl alcohol film has a weight average molecular weight in the range of 10,000 to 200,000, or the polyolefin layer is a polyethylene layer or a polypropylene layer, or the polyolefin layer has a thickness in the range of 20 to 200 μm. 5.The electromagnetic shielding sheet according to claim 1, wherein: the first pressure-sensitive adhesive layer has a thickness in the range of 10 to 200 μm, or the first pressure-sensitive adhesive layer is a rubber-type pressure-sensitive adhesive layer, a resin-type pressure-sensitive adhesive layer, or a silicone pressure-sensitive adhesive layer.

6. The electromagnetic shielding sheet of claim 1, wherein, The polyester-based film, the copper foil, the polyvinyl alcohol film, the nickel foil, and the polyolefin layer are sequentially bonded together by a second pressure-sensitive adhesive layer. 7.The electromagnetic shielding sheet according to claim 6, wherein: the second pressure-sensitive adhesive layer has a thickness in the range of 10 to 200 μm, or the second pressure-sensitive adhesive layer is a rubber-type pressure-sensitive adhesive layer, a resin-type pressure-sensitive adhesive layer, or a silicone pressure-sensitive adhesive layer.

8. The electromagnetic shielding sheet of claim 1, wherein, The electromagnetic shielding sheet further comprises a release layer attached to the first pressure-sensitive adhesive layer.

9. A rail vehicle electrical cabinet, characterized in that The rail vehicle electrical cabinet has the electromagnetic shielding sheet according to any one of the preceding claims 1-8.

10. The rail vehicle electrical cabinet of claim 9, wherein, The electromagnetic shielding sheet is attached to an inner surface, an outer surface, or both of the inner and outer surfaces of the rail vehicle electrical cabinet.

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