CN107135641A - A kind of electromagnetic shielding film of novel metalloid system and preparation method thereof - Google Patents
A kind of electromagnetic shielding film of novel metalloid system and preparation method thereof Download PDFInfo
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- CN107135641A CN107135641A CN201710561447.XA CN201710561447A CN107135641A CN 107135641 A CN107135641 A CN 107135641A CN 201710561447 A CN201710561447 A CN 201710561447A CN 107135641 A CN107135641 A CN 107135641A
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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
- H05K9/0083—Electromagnetic shielding materials, e.g. EMI, RFI shielding comprising electro-conductive non-fibrous particles embedded in an electrically insulating supporting structure, e.g. powder, flakes, whiskers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B29/00—Layered products comprising a layer of paper or cardboard
- B32B29/002—Layered products comprising a layer of paper or cardboard as the main or only constituent of a layer, which is next to another layer of the same or of a different material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/06—Interconnection of layers permitting easy separation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
- B32B2307/212—Electromagnetic interference shielding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/30—Properties of the layers or laminate having particular thermal properties
- B32B2307/306—Resistant to heat
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/712—Weather resistant
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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 provides a kind of electromagnetic shielding film of novel metalloid system and preparation method thereof; including the first protection film layer, ink layer, nonmetallic functional layer, radio frequency gluing layer and the second protection film layer, first protection film layer, ink layer, nonmetallic functional layer, radio frequency gluing layer and the second protection film layer are sequentially fixedly linked.The electromagnetic shielding film of novel metalloid system provided by the present invention, with fabulous pliability, superpower mechanical performance, good conducting shielding properties, have the advantages that ultra-thin, ultralight skilful, heat-resisting weather-proof, current metal system electromagnetic shielding film is instead of well.Using conventional mature technology in the preparation method of the electromagnetic shielding film of novel metalloid system provided by the present invention, technique so that manufacturing process of the invention is simply easily realized, is easy to industrially popularization and application.
Description
Technical field
The present invention relates to electromagnetic shielding material preparing technical field, in particular to a kind of novel metalloid system
Electromagnetic shielding film and preparation method thereof.
Background technology
With smart mobile phone, the development of the digital electronic product such as tablet personal computer, technological progress and social demand, telecommunications
Can be in large quantities using electromagnetic shielding membrane material in product circuit.
At present, in the market FPC has money with the electromagnetic shielding film that main flow electromagnetic shielding film is metal system
Source consumption is big, and manufacturing cost is too high, the features such as performance is not enough.
In view of this, it is special to propose the present invention.
The content of the invention
The first object of the present invention is to provide a kind of electromagnetic shielding film of novel metalloid system, to solve above-mentioned ask
Topic, the electromagnetic shielding film of described novel metalloid system with fabulous pliability, superpower mechanical performance, good is led
Logical shielding properties, has the advantages that ultra-thin, ultralight skilful, heat-resisting weather-proof, and current metal system electromagnetic shielding is instead of well
Film.
The second object of the present invention is to provide a kind of preparation side of the electromagnetic shielding film of described novel metalloid system
Using conventional mature technology in method, this method technique so that manufacturing process of the invention is simply easily realized, is easy to industrially
Popularization and application.
In order to realize the above-mentioned purpose of the present invention, spy uses following technical scheme：
A kind of electromagnetic shielding film of novel metalloid system, including the first protection film layer, ink layer, nonmetallic functional layer,
Radio frequency gluing layer and the second protection film layer, first protection film layer, ink layer, nonmetallic functional layer, nonmetallic lead
Electric adhesive layer and the second protection film layer are sequentially fixedly linked.
The electromagnetic shielding film of novel metalloid system provided by the present invention, with five layers of superthin structure, with fabulous
Pliability, superpower mechanical performance, good conducting shielding properties, have the advantages that it is ultra-thin, ultralight skilful, heat-resisting weather-proof, very well
Ground instead of current metal system electromagnetic shielding film.
It is preferred that, first protection film layer and second protection film layer be selected from PET mould release membrances, PP mould release membrances, PBT from
One kind in type film, release liners.
It is preferred that, the thickness of first protection film layer and second protection film layer is 25-100 μm, and preferred thickness is
25-50μm。
It is preferred that, the ink layer is selected from epoxy resin, polyacrylic resin, modified rubber, phenolic resin, polyester tree
One kind in fat, polyurethane resin.
It is preferred that, the thickness of the ink layer is 5-50 μm, preferably 20-30 μm.
It is preferred that, radio frequency gluing layer, including adhesive and the radio frequency that is dispersed in adhesive
Powder, it is furthermore preferred that the adhesive be selected from modified epoxy, polyacrylic resin, polyimide resin, modified rubber,
One kind in phenolic resin, polyester resin, polyurethane resin, the preferred radio frequency powder be selected from conductive black,
One kind in CNT, graphene.
It is preferred that, the thickness of the radio frequency gluing layer is 5-20 μm, more preferably 10-15 μm.
It is preferred that, a kind of system of the nonmetallic functional layer in middle carbon body, boride, conducting polymer compound
It is standby to form.
It is preferred that, the thickness of the nonmetallic functional layer is 2-25 μm, and thickness preferably is 5-15 μm.
The preparation method of the electromagnetic shielding film of described novel metalloid system, comprises the following steps：
(1) layer of ink that oils is rolled up in the side of nonmetallic functional layer, solidifies ink layer through oven drying, in nonmetallic function
The opposite side coating radio frequency gluing layer of layer, is incorporated to oven drying；
(2) fitted respectively on ink layer and radio frequency gluing layer the first protection film layer and the second protection film layer, receipts
Volume is produced.
Compared with prior art, beneficial effects of the present invention are：
(1) electromagnetic shielding film of novel metalloid system provided by the present invention, with fabulous pliability, superpower machine
Tool performance, good conducting shielding properties, have the advantages that ultra-thin, ultralight skilful, heat-resisting weather-proof, and current gold is instead of well
Category system electromagnetic shielding film.
(2) using conventional in the preparation method of the electromagnetic shielding film of novel metalloid system provided by the present invention, technique
Mature technology so that manufacturing process of the invention is simply easily realized, is easy to industrially popularization and application.
Brief description of the drawings
, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical scheme of the prior art
The accompanying drawing used required in embodiment or description of the prior art is briefly described, it should be apparent that, in describing below
Accompanying drawing is some embodiments of the present invention, for those of ordinary skill in the art, before creative work is not paid
Put, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the electromagnetic shielding film structural representation of novel metalloid system provided by the present invention.
Reference：
The protection film layers of 1- first；2- ink layers；The nonmetallic functional layers of 3-；
4- radio frequencies gluing layer；5 second protection film layers.
Embodiment
Technical scheme is clearly and completely described below in conjunction with the drawings and specific embodiments, but
Be it will be understood to those of skill in the art that following described embodiment is a part of embodiment of the invention, it is rather than whole
Embodiment, is merely to illustrate the present invention, and is not construed as limiting the scope of the present invention.Based on the embodiment in the present invention, ability
The every other embodiment that domain those of ordinary skill is obtained under the premise of creative work is not made, belongs to guarantor of the present invention
The scope of shield.Unreceipted actual conditions person in embodiment, the condition advised according to normal condition or manufacturer is carried out.Agents useful for same
Or the unreceipted production firm person of instrument, it is the conventional products that can be obtained by commercially available purchase.
In the description of the invention, it is necessary to explanation, term " " center ", " on ", " under ", "left", "right", " vertical ",
The orientation or position relationship of the instruction such as " level ", " interior ", " outer " be based on orientation shown in the drawings or position relationship, merely to
Be easy to the description present invention and simplify description, rather than indicate or imply signified device or element must have specific orientation,
With specific azimuth configuration and operation, therefore it is not considered as limiting the invention.In addition, term " first ", " second ",
" the 3rd " is only used for describing purpose, and it is not intended that indicating or implying relative importance.
In the description of the invention, it is necessary to illustrate, unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected, or be integrally connected；Can
To be mechanical connection or electrical connection；Can be joined directly together, can also be indirectly connected to by intermediary, Ke Yishi
The connection of two element internals.For the ordinary skill in the art, with concrete condition above-mentioned term can be understood at this
Concrete meaning in invention.
A kind of electromagnetic shielding film of novel metalloid system of the specific embodiment of the invention, including the first protection film layer 1, oil
Layer of ink 2, nonmetallic functional layer 3, radio frequency gluing layer 4 and the second protection film layer 5, first protection film layer 1, ink layer
2nd, nonmetallic functional layer 3, radio frequency gluing layer 4 and the second protection film layer 5 are sequentially fixedly linked.
Wherein, nonmetallic functional layer 3 is main shield functional layer, and conductive, radiating, shielding simultaneously have superelevation mechanical strength,
And carbon body in carrying effect, nonmetalloid film is played to ink layer 2 and radio frequency gluing layer 4, boride is led
One kind in electric high-molecular compound is made, and thickness is 2-25 μm.
Ink layer 2 has the function of insulation, is epoxy resin, polyacrylic resin, modified rubber, phenolic resin, polyester
One or more of mixtures in resin, polyurethane resin, thickness is 5-50 μm.
Radio frequency gluing layer 4 is made up of adhesive main body and the conducting powder being distributed in adhesive main body, foregoing
Conductive adhesive layer is made up of adhesive main body and radio frequency powder body material.Adhesive main body is modified epoxy, polypropylene
One or more of mixing in acid resin, polyimide resin, modified rubber, phenolic resin, polyester resin, polyurethane resin
Thing；Radio frequency powder body material be conductive black, CNT, graphene, one kind of organic functions high polymer material or
Compound；The thickness of Conductive adhesive layer is 5-20 μm.
The electromagnetic shielding film of novel metalloid system provided by the present invention, with five layers of superthin structure, with fabulous
Pliability, superpower mechanical performance, good conducting shielding properties, have the advantages that it is ultra-thin, ultralight skilful, heat-resisting weather-proof, very well
Ground instead of current metal system electromagnetic shielding film.
In a kind of preferred embodiment of the present invention, first protection film layer 1 and second protection film layer 5 are selected
One kind from PET mould release membrances, PP mould release membrances, PBT mould release membrances and release liners.
PET mould release membrances are a kind of commonly used materials of thermal transfer, and ground is PET, are formed by being coated with silicone oil so also crying
Silicon oil membrane.General thickness is from 25um to 150um.There is cold and hot point torn with the mute face of light, handled by antistatic and anti-scratch, product
With good adsorptivity and stickiness.
PP, polypropylene, be by propylene polymerization prepared by a kind of thermoplastic resin.PP mould release membrances are that a kind of ground is PP
Mould release membrance.
PBT, polybutylene terephthalate (PBT), English name polybutylene terephthalate (abbreviation PBT), category
It is by 1.4-pbt butanediols (1.4-Butylene glycol) and terephthalic acid (TPA) (PTA) or to benzene two in polyester series
Formic acid esters (DMT) polycondensation is formed, and the milky being made via mixing program is translucent to opaque, crystal type thermoplastic poly
Ester resin.Thermoplastic polyester, or saturated polyester are referred to as together with PET.PBT mould release membrances are the mould release membrances that a kind of ground is PBT.
Release liners, i.e. separate paper, also referred to as silicone oil paper.It is made up of three-decker, first layer：Base stock；The second layer：Drench
Film：Third layer：Silicone oil.In a kind of preferred embodiment of the present invention, first protection film layer 1 and second protection
The thickness of film layer 5 is 25-100 μm, and preferred thickness is 25-50 μm.
The thickness control of diaphragm is at 25-100 μm, preferably 25-50 μm, in order to avoid the pliability of influence screened film.
In a kind of preferred embodiment of the present invention, the ink layer 2 be selected from epoxy resin, polyacrylic resin,
One kind in modified rubber, phenolic resin, polyester resin, polyurethane resin.
In a kind of preferred embodiment of the present invention, the thickness of the ink layer 2 is 5-50 μm, and the present invention is a kind of excellent
It is 20-30 μm in the embodiment of choosing.
In a kind of preferred embodiment of the present invention, the radio frequency gluing layer 4, including adhesive and point
The radio frequency powder in adhesive is dispersed in, it is furthermore preferred that the adhesive is selected from modified epoxy, polyacrylic acid tree
One kind in fat, polyimide resin, modified rubber, phenolic resin, polyester resin, polyurethane resin, it is furthermore preferred that described non-
The one kind of metallic conduction powder in conductive black, CNT, graphene.
Wherein, conducting polymer compound is selected from polyacetylene, polybutadiene alkynes, polyparaphenylene, poly-phenylene vinylene (ppv), poly- thiophene
One kind in fen, polythiofuran derivative, polyaniline, polyphenylene sulfide, polyphenylene oxide.
In a kind of preferred embodiment of the present invention, the thickness of the radio frequency gluing layer 4 is 5-20 μm, excellent
Elect 10-15 μm as.
In a kind of preferred embodiment of the present invention, the nonmetallic functional layer 3 selected from middle carbon body, boride,
One kind in conducting polymer compound is prepared from.
In a kind of preferred embodiment of the present invention, the thickness of the nonmetallic functional layer 3 is 2-25 μm, the present invention
Thickness is 5-15 μm in a kind of preferred embodiment.
The preparation method of the electromagnetic shielding film of described novel metalloid system, comprises the following steps：
(1) layer of ink 2 that oils is rolled up in the side of nonmetallic functional layer 3, solidifies ink layer 2 through oven drying, nonmetallic
The opposite side coating radio frequency gluing layer 4 of functional layer 3, is incorporated to oven drying；
(2) fitted respectively on ink layer 2 and radio frequency gluing layer 4 first protection film layer 1 and the second protection film layer
5, winding is produced.
Embodiment 1
The preparation method of the electromagnetic shielding film for the novel metalloid system that the present embodiment is provided, comprises the following steps：
(1) upper 5 μm of ink layers 2 (epoxy resin) are rolled up in the side of 2 μm of nonmetallic functional layer 3 (carbon body), through baking oven
Drying solidifies ink layer 2, and 5 μm of radio frequency gluing layers 4 are coated with (in epoxy resin in the opposite side of nonmetallic functional layer 3
Dispensing of conductive carbon black), it is incorporated to oven drying；
(2) on ink layer 2 and radio frequency gluing layer 4 first protection film layer 1 (PET mould release membrances) of 25 μm of laminating and
25 μm of second protection film layer 5 (PET mould release membrances), winding is produced.
Embodiment 2
The preparation method of the electromagnetic shielding film for the novel metalloid system that the present embodiment is provided, comprises the following steps：
(1) upper 50 μm of ink layers 2 (polyacrylic resin) are rolled up in the side of 25 μm of nonmetallic functional layer 3 (boride),
Solidify ink layer 2 through oven drying, 20 μm of radio frequency gluing 4 (phenolic aldehyde of layer are coated with the opposite side of nonmetallic functional layer 3
Distribution CNT in resin), it is incorporated to oven drying；
(2) on ink layer 2 and radio frequency gluing layer 4 first protection film layer 1 (PP mould release membrances) of 100 μm of laminating and
100 μm of second protection film layer 5 (PP mould release membrances), winding is produced.
Embodiment 3
The preparation method of the electromagnetic shielding film for the novel metalloid system that the present embodiment is provided, comprises the following steps：
(1) upper 20 μm of ink layers 2 (modified rubber) are rolled up in the side of 5 μm of nonmetallic functional layer 3 (boride), through baking oven
Drying solidifies ink layer 2, and 10 μm of radio frequency gluing 4 (polyimides trees of layer are coated with the opposite side of nonmetallic functional layer 3
Distribution graphene in fat), it is incorporated to oven drying；
(2) on ink layer 2 and radio frequency gluing layer 4 first protection film layer 1 (PBT mould release membrances) of 25 μm of laminating and
25 μm of second protection film layer 5 (PBT mould release membrances), winding is produced.
Embodiment 4
The preparation method of the electromagnetic shielding film for the novel metalloid system that the present embodiment is provided, comprises the following steps：
(1) upper 30 μm of ink layers 2 are rolled up in the side of 15 μm of nonmetallic functional layer 3 (conducting polymer compound) (to be modified
Rubber), solidify ink layer 2 through oven drying, 20 μm of radio frequency gluing layers are coated with the opposite side of nonmetallic functional layer 3
4 (distribution graphenes in polyimide resin), are incorporated to oven drying；
(2) on ink layer 2 and radio frequency gluing layer 4 50 μm of laminating the first protection film layer 1 (release liners) and 50 μ
The second protection film layers of m 5 (release liners), winding is produced.
Experimental example properties of product are detected
The electromagnetic shielding film of nonmetallic system prepared by embodiment 1-4 is entered using the quality inspection standard shown in table 1
Row quality testing.
The quality inspection standard of table 1
Testing result shows that the every test result of electromagnetic shielding film of nonmetallic system provided herein can reach
Correspondence index, and metal material is not used completely, it is a kind of new screened film, has saved the consumption of metal, environmental protection.
Although illustrate and describing the present invention with specific embodiment, but it will be appreciated that various embodiments above is only used
To illustrate technical scheme, rather than its limitations；It will be understood by those within the art that：Without departing substantially from this hair
In the case of bright spirit and scope, the technical scheme described in foregoing embodiments can be modified, or to wherein
Some or all of technical characteristic carries out equivalent substitution；And these modifications or replacement, do not make the essence of appropriate technical solution
Depart from the scope of various embodiments of the present invention technical scheme；It is, therefore, intended that including belonging to the present invention in the following claims
In the range of all these substitutions and modifications.
Claims (10)
1. a kind of electromagnetic shielding film of novel metalloid system, it is characterised in that including the first protection film layer, ink layer, non-gold
Function of dominant layer, radio frequency gluing layer and the second protection film layer, first protection film layer, ink layer, nonmetallic functional layer,
Radio frequency gluing layer and the second protection film layer are sequentially fixedly linked.
2. the electromagnetic shielding film of novel metalloid system according to claim 1, it is characterised in that first diaphragm
Layer and the one kind of second protection film layer in PET mould release membrances, PP mould release membrances, PBT mould release membrances, release liners.
3. the electromagnetic shielding film of novel metalloid system according to claim 1, it is characterised in that first diaphragm
Layer and the thickness of second protection film layer are 25-100 μm, and preferred thickness is 25-50 μm.
4. the electromagnetic shielding film of novel metalloid system according to claim 1, it is characterised in that the ink layer is selected from
One kind in epoxy resin, polyacrylic resin, modified rubber, phenolic resin, polyester resin, polyurethane resin.
5. the electromagnetic shielding film of novel metalloid system according to claim 1, it is characterised in that the thickness of the ink layer
Spend for 5-50 μm, preferably 20-30 μm.
6. the electromagnetic shielding film of novel metalloid system according to claim 1, it is characterised in that the radio frequency
Adhesive layer, including adhesive and the radio frequency powder that is dispersed in adhesive, it is preferred that the adhesive, which is selected from, to be modified
In epoxy resin, polyacrylic resin, polyimide resin, modified rubber, phenolic resin, polyester resin, polyurethane resin
One kind, the one kind of the radio frequency powder in conductive black, CNT, graphene preferably.
7. the electromagnetic shielding film of novel metalloid system according to claim 1, it is characterised in that the radio frequency
The thickness of adhesive layer is 5-20 μm, preferably 10-15 μm.
8. the electromagnetic shielding film of novel metalloid system according to claim 1, it is characterised in that the nonmetallic function
Layer choosing is prepared from from one kind in middle carbon body, boride, conducting polymer compound.
9. the electromagnetic shielding film of novel metalloid system according to claim 1, it is characterised in that the nonmetallic function
The thickness of layer is 2-25 μm, and thickness preferably is 5-15 μm.
10. the preparation method of the electromagnetic shielding film of the novel metalloid system according to claim any one of 1-9, its feature
It is, comprises the following steps：
(1) layer of ink that oils is rolled up in the side of nonmetallic functional layer, solidifies ink layer through oven drying, in nonmetallic functional layer
Opposite side coating radio frequency gluing layer, is incorporated to oven drying；
(2) fitted respectively on ink layer and radio frequency gluing layer the first protection film layer and the second protection film layer, winding is
.
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| CN108495544A (en) * | 2018-07-02 | 2018-09-04 | 蔡志浩 | A kind of electromagnetic shielding film |
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| WO2019010973A1 (en) * | 2017-07-11 | 2019-01-17 | 苏州城邦达力材料科技有限公司 | Novel nonmetal-system electromagnetic shielding film and preparation method therefor, and flexible printed circuit board |
| CN108495544A (en) * | 2018-07-02 | 2018-09-04 | 蔡志浩 | A kind of electromagnetic shielding film |
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