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CN-121970982-A - Multi-layer composite curtain for preventing electromagnetic information leakage and curtain system

CN121970982ACN 121970982 ACN121970982 ACN 121970982ACN-121970982-A

Abstract

The application discloses a multilayer composite curtain and a curtain system for preventing electromagnetic information leakage, wherein a curtain body comprises a front layer, an electromagnetic shielding layer and a back layer, all of which are integrally sewn, the back layer adopts full-shading technical cloth, the electromagnetic shielding layer adopts a flexible electrode material film prepared by gradient coating and low-temperature heat treatment processes of graphene-carbon nano tube composite conductive paste, the surface resistance is less than or equal to 0.1 omega/≡, and the shielding effect is more than or equal to 70dB in a 30MHz-18GHz full frequency band. The curtain is provided with a longitudinal shaping crease along the width, and a counterweight strip is arranged at the bottom. The curtain system comprises the curtain and the track structure, wherein two ends of the track extend to at least 15cm in the wall body, and are provided with the side sealing structure and the lower swinging balancing weight, so that the omnidirectional sealing around the window body is realized. The application can solve the problems of electromagnetic information leakage and optical visual leakage on the premise of not changing the building structure, and has the characteristics of low cost, easy deployment, high stability, wide frequency band and strong attenuation.

Inventors

  • ZHANG DUOHUI
  • Ye Yunguang

Assignees

  • 北京市大唐盛兴科技发展有限公司

Dates

Publication Date
20260505
Application Date
20260313

Claims (9)

  1. 1. The multi-layer composite curtain for preventing electromagnetic information leakage is characterized by comprising a curtain body, wherein the curtain body comprises a front surface layer facing the indoor side, a back surface layer facing the outdoor side and an electromagnetic shielding layer arranged between the front surface layer and the back surface layer, the front surface layer, the electromagnetic shielding layer and the back surface layer are integrally sewn through sewing threads, the back surface layer adopts full shading scientific and technological cloth, and the electromagnetic shielding layer adopts a high-conductivity flexible electrode material film; the curtain body is provided with a plurality of parallel longitudinal shaping folds at intervals along the width direction, the distance between every two adjacent longitudinal shaping folds is at least 5cm, and the longitudinal shaping folds are used for enabling the curtain to form a continuous wavy fold shape in a hanging state; the lower hem of the curtain body is provided with a counterweight strip, and the counterweight strip is used for enabling the lower hem of the curtain to drop and fit with a windowsill or a floor under a hanging state.
  2. 2. The multi-layer composite window shade for preventing leakage of electromagnetic information according to claim 1, wherein a plurality of uniformly distributed hanging positioning points are arranged on the top of the window shade body, and hanging connecting pieces matched with window shade mounting rails are arranged on the hanging positioning points.
  3. 3. The multi-layer composite window covering for preventing leakage of electromagnetic information according to claim 1, wherein the electromagnetic shielding layer comprises a conductive network formed by compounding graphene with carbon nanotubes, and the electromagnetic shielding layer has a gradient distribution structure along the thickness direction, wherein the structure is formed by gradient coating and low-temperature heat treatment of graphene-carbon nanotube composite conductive paste.
  4. 4. The multi-layer composite curtain for preventing electromagnetic information leakage according to claim 1, wherein the electromagnetic shielding layer is a general electromagnetic shielding cloth prepared by dimension reduction based on a new energy lithium battery flexible electrode technology.
  5. 5. A multi-layer composite curtain system for preventing electromagnetic information leakage, which is characterized by comprising a curtain and a track structure for installing the curtain, wherein the curtain is the multi-layer composite curtain for preventing electromagnetic information leakage according to any one of claims 1-4; the track structure comprises a horizontal track for hanging the curtain, and two ends of the horizontal track extend into the wall bodies on the left side and the right side of the window frame by at least 15cm respectively; the curtain body is tightly attached to the indoor wall body at one side of the wavy folds facing the outdoor under the hanging state.
  6. 6. The multi-layered composite window covering system for preventing leakage of electromagnetic information according to claim 5, wherein the horizontal rail is a roman pole, a manual sliding rail, or an electric rail, and the window covering body is detachably connected to the horizontal rail by a hanging connection provided at the top thereof.
  7. 7. The multi-layer composite curtain system for preventing electromagnetic information leakage according to claim 5, wherein a plurality of hanging points for hanging balancing weights are arranged on the horizontal track, each hanging point is provided with a hanging rope, each balancing weight is of a strip-shaped block structure, a plurality of hanging connection points corresponding to the hanging ropes one by one are arranged on the balancing weight, the balancing weight is located in a lower swing area of the curtain body, and the balancing weight can enable the lower swing of the curtain body to be tightly attached to a building foundation structure by means of dead weight.
  8. 8. The multi-layer composite window covering system for protecting against leakage of electromagnetic information of claim 7, further comprising a lift drive assembly for driving the weight to lift, the lift drive assembly in driving connection with the weight.
  9. 9. The multi-layered composite window covering system for preventing leakage of electromagnetic information according to claim 7, wherein the rail structure further comprises a cross bar for installing a side sealing structure, the side sealing structure comprises a connecting bar parallel to the horizontal rail and a left sealing bar and a right sealing bar respectively arranged at two ends of the connecting bar, the left sealing bar and the right sealing bar are respectively perpendicular to the connecting bar, one end of the left sealing bar is directed to the indoor side, the other end of the left sealing bar is directed to the outdoor side, the length direction of the right sealing bar is parallel to the length direction of the left sealing bar, and the left sealing bar and the right sealing bar are used for pressing and attaching the window covering body on left and right side walls of a window frame; the horizontal rod is parallel to the horizontal track, and a plurality of mounting points for hanging the connecting rods of the side sealing structures are arranged on the horizontal rod.

Description

Multi-layer composite curtain for preventing electromagnetic information leakage and curtain system Technical Field The application relates to the technical field of electromagnetic information safety protection, in particular to a multi-layer composite curtain for preventing electromagnetic information leakage and a curtain system. Background In high security level places such as secret-related offices, financial data centers, scientific research laboratories and the like, electronic equipment (particularly a display, a host and a printing controller) can inevitably radiate electromagnetic signals in a wide frequency band (30 MHz-18 GHz) outwards during working. These signals carry information characteristics of the internal processing of the device, such as synchronization pulses at the time of CRT/LCD screen refresh, harmonic radiation of the display data bus, transient noise of USB/parallel port communication, etc. An attacker can receive such weak radiation outside several meters to tens of meters by using a directional antenna and a software radio (SDR) device, and reconstruct screen display contents, keyboard input and even document text through a signal processing algorithm (such as a TEMPEST technology), thereby constituting a serious electromagnetic information leakage (EMI LEAKAGE) risk. Aiming at the electromagnetic shielding problem, the existing protection means mainly comprise the following aspects: 1. building-level shielding means For example, copper net walls and shielding machine rooms have extremely high construction cost and great transformation difficulty, and are not suitable for the existing office environment. For example, chinese patent No. CN118890889a discloses a comprehensive electromagnetic shielding protection system for a building and a shielding effectiveness evaluation method thereof, where the protection system includes at least three levels of electromagnetic shielding protection, where the first level of electromagnetic shielding protection includes electromagnetic shielding protection for each information device, the second level of electromagnetic shielding protection includes electromagnetic shielding protection for each of a plurality of areas, and the third level of electromagnetic shielding protection includes electromagnetic shielding protection for the whole building. According to the scheme, a comprehensive protection system is constructed on a macroscopic level, and when the existing building needs to be modified, large-scale shielding construction (such as coating shielding cement and installing a shielding window) is high in cost and complex in implementation. 2. Equipment-level shielding means Such as equipment shields, filters, etc., which cover only a single piece of equipment, cannot solve the problem of integrated radiation superposition of multiple equipment co-located in a single room, and affects heat dissipation and operation. 3. Curtain shielding means In a building structure, a window is used as a main opening part, is often a key channel for electromagnetic leakage, and becomes a weak link for information safety protection. For this reason, there are also curtains in the prior art which have a shielding effect. The traditional electromagnetic shielding curtain is commonly blended by stainless steel/nickel-copper alloy, the shielding effectiveness is generally lower than 40dB (more than 1 GHz), the performance attenuation after being easily oxidized and bent is remarkable, and the requirement of more than or equal to 70dB on sensitive information protection in GB/T18975-2003 'information technology equipment immunity limit value and measurement method' is difficult to meet. Some curtains adopting silver fibers have better high-frequency shielding performance (the shielding efficiency can reach more than 40dB in the frequency range from 1GHz to 18 GHz), but the shielding efficiency of a low-frequency band (30 MHz-1 GHz) is only more than or equal to 50dB, the risk of capturing key fundamental frequency signals by a narrow-band high-sensitivity receiver still exists, and silver ion migration causes insufficient long-term stability. In addition, chinese patent No. CN117301642a discloses a functional curtain based on reduced graphene oxide and carbon nanotubes and a method for manufacturing the same, the curtain with electromagnetic shielding effect disclosed by the present invention comprises a cloth substrate, an antibacterial layer and an electromagnetic shielding layer disposed between the cloth substrate and the antibacterial layer, wherein the electromagnetic shielding layer is formed by distributing carbon nanotubes between two layers of honeycomb fabrics. And, chinese patent No. CN212666853U discloses an electromagnetic shielding curtain, and discloses a curtain comprising a cloth substrate layer, a nanocellulose-based electromagnetic shielding layer and a microcellulose layer. The curtain bears the carbon nano tube through the nano cellulose g