CN113766821A - Electromagnetic pulse protective film - Google Patents
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- CN113766821A CN113766821A CN202111065952.8A CN202111065952A CN113766821A CN 113766821 A CN113766821 A CN 113766821A CN 202111065952 A CN202111065952 A CN 202111065952A CN 113766821 A CN113766821 A CN 113766821A
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- 230000001681 protective effect Effects 0.000 title claims abstract description 31
- 229910052751 metal Inorganic materials 0.000 claims abstract description 42
- 239000002184 metal Substances 0.000 claims abstract description 42
- GXDVEXJTVGRLNW-UHFFFAOYSA-N [Cr].[Cu] Chemical compound [Cr].[Cu] GXDVEXJTVGRLNW-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000002131 composite material Substances 0.000 claims abstract description 20
- 238000001704 evaporation Methods 0.000 claims abstract description 18
- 230000008020 evaporation Effects 0.000 claims abstract description 15
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 7
- 238000003486 chemical etching Methods 0.000 claims abstract description 7
- 229910052802 copper Inorganic materials 0.000 claims abstract description 7
- 239000010949 copper Substances 0.000 claims abstract description 7
- 239000000126 substance Substances 0.000 claims abstract description 7
- 230000000694 effects Effects 0.000 claims description 28
- 238000000034 method Methods 0.000 claims description 24
- 238000002474 experimental method Methods 0.000 claims description 19
- 238000012360 testing method Methods 0.000 claims description 19
- 230000001939 inductive effect Effects 0.000 claims description 17
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 10
- 238000005530 etching Methods 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 238000004806 packaging method and process Methods 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 5
- 238000005516 engineering process Methods 0.000 claims description 4
- 238000004804 winding Methods 0.000 claims description 4
- 229920002799 BoPET Polymers 0.000 claims description 3
- 238000011049 filling Methods 0.000 claims description 3
- 238000010329 laser etching Methods 0.000 claims description 3
- 230000005389 magnetism Effects 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 238000001771 vacuum deposition Methods 0.000 claims description 3
- 239000000853 adhesive Substances 0.000 claims 1
- 230000001070 adhesive effect Effects 0.000 claims 1
- 230000006698 induction Effects 0.000 abstract description 2
- 238000002360 preparation method Methods 0.000 abstract description 2
- 150000003839 salts Chemical class 0.000 description 16
- 239000007921 spray Substances 0.000 description 16
- 230000009471 action Effects 0.000 description 4
- 238000010998 test method Methods 0.000 description 4
- 238000002834 transmittance Methods 0.000 description 3
- 238000002955 isolation Methods 0.000 description 2
- 238000011005 laboratory method Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 241000532927 Lagerstroemia Species 0.000 description 1
- 206010033799 Paralysis Diseases 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000002845 discoloration Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000004377 microelectronic Methods 0.000 description 1
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
- H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
- H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
- H05K9/0084—Electromagnetic shielding materials, e.g. EMI, RFI shielding comprising a single continuous metallic layer on an electrically insulating supporting structure, e.g. metal foil, film, plating coating, electro-deposition, vapour-deposition
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
The invention discloses an electromagnetic pulse protection film which comprises a PET medium, wherein copper-chromium metal grids are arranged at the top and the bottom of the PET medium, the copper-chromium metal grids are formed by chemical etching after evaporation of a metal copper simple substance, an induction and reflection-increasing composite layer is arranged inside the copper-chromium metal grids, and a protection film is adhered to the outer sides of the copper-chromium metal grids. According to the invention, the copper-chromium metal grid is arranged, electromagnetic pulses can be greatly weakened under the conductive condition, the shielding efficiency of each frequency band is strong, the electromagnetic pulse resistance indexes of different degrees can be achieved according to the actual user requirements by setting a plurality of adjustable parameters in the preparation process of the PET medium, and the problems that the low, medium and high frequency bands are required to be simultaneously shielded by the existing shielding measures, and protective filters need to be installed at conductive paths entering an electric system in large quantity, and when one protective filter is damaged, the whole system can be damaged or even destroyed are solved.
Description
Technical Field
The invention relates to the technical field of military field operations, in particular to an electromagnetic pulse protection film.
Background
With the development of pulse power technology, high-power electromagnetic pulse poses a serious threat to the safety of electronic information equipment, based on densely packaged microelectronic equipment on a modern military platform and the realization of non-nuclear property of electromagnetic pulse, the electromagnetic pulse weapon is a novel information system attack weapon which emits the action energy to enemy at the speed of light, and strong electromagnetic pulse enters an electronic system and equipment through cables, antennas or wiring terminals and the like to generate very high instantaneous induced voltage and current to break down a circuit and even burn the electronic system and equipment, so that the enemy system, the air defense system and other military electronic equipment are paralyzed.
The main countermeasure of the EMP weapon is to use conductive or magnetic conductive material to make a shield, and limit the electromagnetic energy in a certain space range, so that the electromagnetic energy is greatly weakened when being transmitted from one side of the shield to the other side, but the existing shield measures must simultaneously shield low, medium and high frequency bands, and need to install a protection filter at a large number of conductive paths entering an electrical system, when a certain protection filter is damaged, the whole system can be damaged or even destroyed.
Disclosure of Invention
In order to solve the problems in the background art, the present invention provides an electromagnetic pulse protection film, which has the advantages of reducing the shielding difficulty and the production cost of the EMP model, and solves the problems that the existing shielding measures must shield low, medium and high frequency bands simultaneously, and a large number of protection filters need to be installed at conductive paths entering an electrical system, and when one protection filter is damaged, the whole system may be damaged or even destroyed.
In order to achieve the purpose, the invention provides the following technical scheme: the electromagnetic pulse protection film comprises a PET medium, wherein copper-chromium metal grids are arranged at the top and the bottom of the PET medium, the copper-chromium metal grids are formed by chemical etching after evaporation of a metal copper simple substance, an inducing and anti-reflection composite layer is arranged inside the copper-chromium metal grids, and a protection film is adhered to the outer sides of the copper-chromium metal grids.
3. The manufacturing method of the electromagnetic pulse protection film, which is preferred by the invention, comprises the following steps of a) evaporation, b) etching, c) coating, d) film combination and e) packaging:
step a) evaporation: evaporating a metal copper simple substance to two sides of an evaporation carrier by a vacuum coating technology;
step b) etching: constructing a micron-sized metal mesh grid layer capable of conducting and conducting magnetism by a micron-sized laser etching machine in a chemical etching mode with a controllable structure;
step c) smearing: coating an inducing and anti-reflection composite material on the surface of the cooled film, completely filling the inducing and anti-reflection composite material into the copper-chromium metal grid and making the inducing and anti-reflection composite material flush with the copper-chromium metal grid in height, and waiting for the inducing and anti-reflection composite material to be dried into an inducing and anti-reflection composite layer to obtain an electromagnetic pulse protection film product;
step d) film combination: the electromagnetic pulse protection film product and two protection films with the same width as the electromagnetic pulse protection film product are synchronously transported and are pressed, covered and adhered by two pressing wheels;
step e) packaging: and winding the electromagnetic pulse protection film product attached with the protection film by a full-automatic winding machine to form a plurality of coils, and storing the coils after appearance testing.
Preferably, in the step b), the micron-sized metal mesh grid layer is etched, and has a hexagonal structure, a line width of 5 microns and a thickness of 2 to 40 microns.
Preferably, in the step a), the thickness of the selected PET film is 50 to 200 microns.
Preferably, in the step B), the adhesion force of the micron-sized metal mesh grid layer is greater than 4B.
The detection method of the electromagnetic signal of the electromagnetic pulse protection film, which is preferred by the invention, comprises the following embodiments: in the first embodiment, the electromagnetic pulse protection film shields electromagnetic models of various frequency bands in a normal environment; example electromagnetic pulse protection films shield electromagnetic models of various frequency bands in a demisting environment.
Preferably, the method comprises the following steps:
s1: selecting the same batch of electromagnetic pulse protection films, and dividing the same batch of electromagnetic pulse protection films into 5 parts;
s2: respectively wrapping 5 parts of electromagnetic pulse protection films on the surfaces of five identical sealed objects, and placing an electromagnetic signal receiver inside the objects;
s3: in an EMC darkroom environment, electromagnetic signals of different frequency bands are transmitted to the box body from the outside of the box body, the signals are received through an electromagnetic signal receiver inside the box body, and the shielding effect is calculated;
s4: the above experiment was repeated 6 times and the data was recorded.
8. Preferably, the embodiment comprises the following steps:
s1: selecting the same batch of electromagnetic pulse protection films, and dividing the same batch of electromagnetic pulse protection films into 5 parts;
s2: respectively wrapping 5 parts of electromagnetic pulse protection films on the surfaces of five identical sealed objects, and placing an electromagnetic signal receiver inside the objects;
s3: placing the box body stored with the receiver into the salt spray test box, then transmitting electromagnetic signals of different frequency bands to the box body from the outside of the box body, receiving the signals in the salt spray environment through the electromagnetic signal receiver in the box body and calculating the shielding effect;
s4: the above experiment was repeated 6 times and the data was recorded.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention can greatly weaken electromagnetic pulse under the conductive condition by arranging the copper-chromium metal grid, has strong shielding efficiency of each frequency band, can achieve electromagnetic pulse resistance indexes of different degrees according to the requirements of actual users by arranging a plurality of adjustable parameters in the preparation process of the PET medium, has certain advantages on cost and material control, ensures that the electromagnetic pulse resistance film with high protection performance and high transmittance can be realized by the structure of the copper-chromium metal grid and the characteristics of the PET medium layer, has wider application range than a conventional protection device, is a soft flexible material, can be attached with back glue in various protection scenes, has wide application scenes, solves the problems that the existing shielding measures need to simultaneously shield low, medium and high frequency bands, and needs to install a protection filter at a large number of conductive paths entering an electric system, when one protective filter is damaged, the whole system can be damaged or even destroyed.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic front view of the present invention;
FIG. 3 is a perspective view of a portion of the present invention;
FIG. 4 is an enlarged view of the structure at A in FIG. 1 according to the present invention;
table 1 shows the shielding effect of the electromagnetic pulse protection film on the electromagnetic model of each frequency band.
In the figure: 1. a PET medium; 2. a copper-chromium metal grid; 3. an induction and anti-reflection composite layer; 4. and (5) protecting the film.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 to 4, the electromagnetic pulse protection film provided by the present invention includes a PET medium 1, wherein both the top and the bottom of the PET medium 1 are provided with a copper-chromium metal grid 2, the copper-chromium metal grid 2 is formed by chemical etching after evaporation of a metal copper simple substance, an inducing-reflecting composite layer 3 is provided inside the copper-chromium metal grid 2, and a protection film 4 is adhered to the outer side of the copper-chromium metal grid 2.
The manufacturing method of the electromagnetic pulse protection film comprises the following steps of a) evaporation, b) etching, c) coating, d) film combination and e) packaging:
step a) evaporation: evaporating a metal copper simple substance to two sides of an evaporation carrier by a vacuum coating technology;
step b) etching: constructing a micron-sized metal mesh grid layer capable of conducting and conducting magnetism by a micron-sized laser etching machine in a chemical etching mode with a controllable structure;
step c) smearing: coating an inducing and anti-reflection composite material on the surface of the cooled film, completely filling the inducing and anti-reflection composite material into the copper-chromium metal grid and making the inducing and anti-reflection composite material flush with the copper-chromium metal grid in height, and waiting for the inducing and anti-reflection composite material to be dried into an inducing and anti-reflection composite layer to obtain an electromagnetic pulse protection film product;
step d) film combination: the electromagnetic pulse protection film product and two protection films with the same width as the electromagnetic pulse protection film product are synchronously transported and are pressed, covered and adhered by two pressing wheels;
step e) packaging: and (3) rolling the electromagnetic pulse protection film product attached with the protective film by using a full-automatic rolling machine with the model number of PPMC-009 to form a plurality of coils, performing visual testing by using a test method 6.1 in H/T4605-2014, and storing the coils in a warehouse after the apparent quality meets the requirement.
The invention is further set in that in the step b), etching is carried out, the structure of the micron-sized metal mesh grid layer is hexagonal, the line width is 5 microns, and the thickness is 2 microns to 40 microns.
The invention is further set in that in the step a), evaporation is carried out, the thickness of the selected PET film is between 50 micrometers and 200 micrometers, and the thickness is tested and selected according to 2.1.1 strips in GB/T6672-2001 in a measuring mode.
The invention is further set in that in the step B), the adhesion force of the micron-sized metal mesh grid layer is larger than 4B.
After the product is produced, the following index tests are required:
1. and (3) testing appearance quality indexes:
the assessment method comprises the following steps: visual method appearance test is carried out according to test method 6.1 in H/T4605-2014, the apparent mass item is tested according to 5.1 in H/T4605-2014, and the index requirements are as follows: the defect that the apparent mass does not exceed the requirement is qualified.
2. And (3) testing the thickness index:
the assessment method comprises the following steps: thickness measurement is carried out by a thickness gauge (with the precision of 1 micron) according to 2.1.1 strips in GB/T6672-2001, wherein the thickness h is (h1+ h2+ h3+. h20)/20, and the index requirements are as follows: the thickness h is less than or equal to 100 microns.
3. Testing the indexes of light transmittance and haze:
the assessment method comprises the following steps: adjusting for 40h under the condition of GB/T2918(23 +/-2 ℃), and performing a test according to a haze meter method A of 7.1 in GB/T2410-2008, wherein the indexes are as follows: light transmittance: t is more than or equal to 0.1%, haze: h is less than or equal to 0.6 percent.
4. Testing the sheet resistance uniformity index:
the assessment method comprises the following steps: a square resistance method, a dispersion method; the sample is adjusted for 2h under the condition of GB/T2918(23 +/-2 ℃), and the indexes are as follows: the sheet resistance uniformity is as follows: r' is less than or equal to 88.
5. And (3) testing the electromagnetic shielding effect indexes:
the assessment method comprises the following steps: according to the 5 th shielding laboratory method experiment in GJB6190-2008, the index requirements are as follows: shielding effectiveness: SE is less than or equal to 80
6. And (3) testing the protection isolation index:
the assessment method comprises the following steps: according to the 14 th method 501 electromagnetic pulse test method and threat level irradiation test method in GJB8848, the indexes require: protection isolation degree: SH is less than or equal to 100.
7. Testing indexes of a salt spray experiment:
the assessment method comprises the following steps: test according to GJB150.11A: the test conditions are 24-hour spraying and 24-hour drying, and the total time is 2 cycles for 96 hours, and the indexes are as follows: no foaming, discoloration, film falling and cracks appear in the appearance.
The method for detecting the electromagnetic signal of the electromagnetic pulse protection film comprises the following embodiments:
the first embodiment is as follows: shielding electromagnetic models of various frequency bands by the electromagnetic pulse protection film under normal environment:
selecting the same batch of electromagnetic pulse protection films, adding the electromagnetic pulse protection films to equipment, and placing an electromagnetic signal receiver in an object; in an EMC darkroom environment, electromagnetic signals of different frequency bands are transmitted to the box body from the outside of the box body, the signals are received through an electromagnetic signal receiver inside the box body, and the shielding effect is calculated according to a No. 5 screen Wei laboratory test in GJB 6190-2008; the above experiment was repeated and the data recorded.
Example two: shielding electromagnetic models of various frequency bands by the electromagnetic pulse protection film in a salt spray environment:
selecting the same batch of electromagnetic pulse protection films, adding the electromagnetic pulse protection films to equipment, placing an electromagnetic signal receiver inside an object, placing a box body with the receiver inside a salt spray test box, then transmitting electromagnetic signals of different frequency bands to the box body from the outside of the box body, receiving the signals in a salt spray environment through the electromagnetic signal receiver inside the box body, calculating the shielding effect according to the 5 th Lagerstroemia Specification laboratory method test in GJB6190-2008, repeating the above test and recording data.
Experiments show that:
in a normal experimental environment, when the frequency point of the electromagnetic pulse is 15MHZ, the protective film can achieve an electromagnetic shielding effect of 64.5dB, and in a salt spray experimental environment, the protective film can achieve an electromagnetic shielding effect of 56 dB;
in a normal experimental environment, when the frequency point of the electromagnetic pulse is 450MHZ, the protective film can achieve 77dB of electromagnetic shielding effect, and in a salt spray experimental environment, the protective film can achieve 67.5dB of electromagnetic shielding effect;
in a normal experimental environment, when the frequency point of the electromagnetic pulse is 950MHZ, the protective film can achieve 66dB of electromagnetic shielding effect, and in a salt spray experimental environment, the protective film can achieve 56dB of electromagnetic shielding effect;
in a normal experiment environment, when the frequency point of the electromagnetic pulse is 3GHZ, the protective film can achieve 61.5dB of electromagnetic shielding effect, and in a salt spray experiment environment, the protective film can achieve 52.5dB of electromagnetic shielding effect;
in a normal experiment environment, when the frequency point of the electromagnetic pulse is 6GHZ, the protective film can achieve 55dB of electromagnetic shielding effect, and in a salt spray experiment environment, the protective film can achieve 47dB of electromagnetic shielding effect;
in a normal experiment environment, when the frequency point of the electromagnetic pulse is 10GHZ, the protective film can achieve 55dB of electromagnetic shielding effect, and in a salt spray experiment environment, the protective film can achieve 47dB of electromagnetic shielding effect;
in a normal experiment environment, when the frequency point of the electromagnetic pulse is 12GHZ, the electromagnetic shielding effect of the protective film can reach 49.5dB, and in a salt spray experiment environment, the electromagnetic shielding effect of the protective film can reach 40.5 dB;
in a normal experimental environment, when the frequency point of the electromagnetic pulse is 18GHZ, the protective film can achieve the electromagnetic shielding effect of 43.5dB, and in a salt spray experimental environment, the protective film can achieve the electromagnetic shielding effect of 46 dB;
in a normal experiment environment, when the frequency point of the electromagnetic pulse is 26GHZ, the protective film can achieve the electromagnetic shielding effect of 50dB, and in a salt spray experiment environment, the protective film can achieve the electromagnetic shielding effect of 41.5 dB;
in a normal experiment environment, when the frequency point of the electromagnetic pulse is 39.5GHZ, the protective film can achieve the electromagnetic shielding effect of 50dB, and in a salt spray experiment environment, the protective film can achieve the electromagnetic shielding effect of 36.5 dB;
table 1 shows the shielding effect of the electromagnetic pulse protection film on the electromagnetic model of each frequency band.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. An electromagnetic pulse protection film comprising a PET medium (1), characterized in that: the PET medium is characterized in that copper-chromium metal grids (2) are arranged at the top and the bottom of the PET medium (1), the copper-chromium metal grids (2) are formed by chemical etching after evaporation of metal copper simple substances, an inducing and anti-reflection composite layer (3) is arranged inside the copper-chromium metal grids (2), and a protective film (4) is adhered to the outer sides of the copper-chromium metal grids (2).
2. A method for manufacturing an electromagnetic pulse protective film according to claim 1, wherein: the method comprises the following steps of a) evaporation, b) etching, c) smearing, d) film combining and e) packaging:
step a) evaporation: evaporating a metal copper simple substance to two sides of an evaporation carrier by a vacuum coating technology;
step b) etching: constructing a micron-sized metal mesh grid layer capable of conducting and conducting magnetism by a micron-sized laser etching machine in a chemical etching mode with a controllable structure;
step c) smearing: coating an inducing and anti-reflection composite material on the surface of the cooled film, completely filling the inducing and anti-reflection composite material into the copper-chromium metal grid and making the inducing and anti-reflection composite material flush with the copper-chromium metal grid in height, and waiting for the inducing and anti-reflection composite material to be dried into an inducing and anti-reflection composite layer to obtain an electromagnetic pulse protection film product;
step d) film combination: the electromagnetic pulse protection film product and two protection films with the same width as the electromagnetic pulse protection film product are synchronously transported and are pressed, covered and adhered by two pressing wheels;
step e) packaging: and winding the electromagnetic pulse protection film product attached with the protection film by a full-automatic winding machine to form a plurality of coils, and storing the coils after appearance testing.
3. A method for manufacturing an electromagnetic pulse protective film according to claim 2, wherein: etching is carried out in the step b), the structure of the micron-sized metal mesh grid layer is hexagonal, the line width is 5 microns, and the thickness is 2 microns to 40 microns.
4. A method for manufacturing an electromagnetic pulse protective film according to claim 2, wherein: the evaporation in the step a) is carried out, and the thickness of the selected PET film is between 50 microns and 200 microns.
5. A method for manufacturing an electromagnetic pulse protective film according to claim 2, wherein: and B) etching, wherein the adhesive force of the micron-sized metal mesh grid layer is larger than 4B.
6. The method for detecting an electromagnetic signal of an electromagnetic pulse protection film according to claim 1, wherein:
s1: selecting the same batch of electromagnetic pulse protection films, and dividing the same batch of electromagnetic pulse protection films into 5 parts;
s2: respectively wrapping 5 parts of electromagnetic pulse protection films on the surfaces of five identical sealed objects, and placing an electromagnetic signal receiver inside the objects;
s3: in an EMC darkroom environment, electromagnetic signals of different frequency bands are transmitted to the box body from the outside of the box body, the signals are received through an electromagnetic signal receiver inside the box body, and the shielding effect is calculated;
s4: the above experiment was repeated 6 times and the data was recorded.
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| CN202111065952.8A CN113766821A (en) | 2021-09-14 | 2021-09-14 | Electromagnetic pulse protective film |
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| CN202111065952.8A CN113766821A (en) | 2021-09-14 | 2021-09-14 | Electromagnetic pulse protective film |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007137486A1 (en) * | 2006-05-25 | 2007-12-06 | 72G International Company Limited | Electromagnetic shielded film and its manufacturing method |
| CN101222840A (en) * | 2008-02-04 | 2008-07-16 | 哈尔滨工业大学 | Electromagnetic shielding optical window with double-layer pane metal gridding structure |
| CN103813702A (en) * | 2014-02-14 | 2014-05-21 | 哈尔滨工业大学 | Double layer staggered orthogonal tangent circular ring and internally tangent sub-circular ring array electromagnetic shielding light window |
| KR20180020346A (en) * | 2016-08-17 | 2018-02-28 | 주식회사 이레테크 | Method for constructing an electromagnetic pulse shielding facilitiy at protection room and the electromagnetic pulse shielding facilitiy |
| CN109406899A (en) * | 2018-11-12 | 2019-03-01 | 中国科学院长春光学精密机械与物理研究所 | Active light transmission shielding membrane shield effect test method, apparatus and system |
| CN211507150U (en) * | 2020-03-31 | 2020-09-15 | 长沙韶光铬版有限公司 | Light-transmitting conductive metal grid structure |
-
2021
- 2021-09-14 CN CN202111065952.8A patent/CN113766821A/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007137486A1 (en) * | 2006-05-25 | 2007-12-06 | 72G International Company Limited | Electromagnetic shielded film and its manufacturing method |
| CN101222840A (en) * | 2008-02-04 | 2008-07-16 | 哈尔滨工业大学 | Electromagnetic shielding optical window with double-layer pane metal gridding structure |
| CN103813702A (en) * | 2014-02-14 | 2014-05-21 | 哈尔滨工业大学 | Double layer staggered orthogonal tangent circular ring and internally tangent sub-circular ring array electromagnetic shielding light window |
| KR20180020346A (en) * | 2016-08-17 | 2018-02-28 | 주식회사 이레테크 | Method for constructing an electromagnetic pulse shielding facilitiy at protection room and the electromagnetic pulse shielding facilitiy |
| CN109406899A (en) * | 2018-11-12 | 2019-03-01 | 中国科学院长春光学精密机械与物理研究所 | Active light transmission shielding membrane shield effect test method, apparatus and system |
| CN211507150U (en) * | 2020-03-31 | 2020-09-15 | 长沙韶光铬版有限公司 | Light-transmitting conductive metal grid structure |
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