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KR20160126188A - Electro magnetic shielding sheet and manufacturing method of the same - Google Patents

Electro magnetic shielding sheet and manufacturing method of the same Download PDF

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Publication number
KR20160126188A
KR20160126188A KR1020150056938A KR20150056938A KR20160126188A KR 20160126188 A KR20160126188 A KR 20160126188A KR 1020150056938 A KR1020150056938 A KR 1020150056938A KR 20150056938 A KR20150056938 A KR 20150056938A KR 20160126188 A KR20160126188 A KR 20160126188A
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KR
South Korea
Prior art keywords
layer
sheet
electromagnetic wave
magnetic sheet
wave shielding
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Application number
KR1020150056938A
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Korean (ko)
Inventor
김용상
이종일
이대희
김동현
Original Assignee
주식회사 엠피코
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Priority to KR1020150056938A priority Critical patent/KR20160126188A/en
Publication of KR20160126188A publication Critical patent/KR20160126188A/en

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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
    • 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
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • 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
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/20—Modifications to facilitate cooling, ventilating, or heating
    • H05K7/2039—Modifications to facilitate cooling, ventilating, or heating characterised by the heat transfer by conduction from the heat generating element to a dissipating body
    • H05K7/20436—Inner thermal coupling elements in heat dissipating housings, e.g. protrusions or depressions integrally formed in the housing
    • H05K7/20445—Inner thermal coupling elements in heat dissipating housings, e.g. protrusions or depressions integrally formed in the housing the coupling element being an additional piece, e.g. thermal standoff
    • H05K7/20472—Sheet interfaces
    • 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
    • H05K9/0075—Magnetic shielding materials

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Thermal Sciences (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)

Abstract

TECHNICAL FIELD The present invention relates to a multifunctional composite sheet having electromagnetic wave absorption, shielding, heat release, and shock absorption, and a method of manufacturing the same, and more particularly to a multifunctional composite sheet having electromagnetic absorption, shielding, The present invention provides a composite sheet for electromagnetic shielding and heat dissipation and a method of manufacturing the same, which can improve the emission and EMI / EMC problems.
Accordingly, the present invention provides an electromagnetic shielding layer formed of at least one magnetic sheet layer for shielding and absorbing electromagnetic waves; A graphite sheet laminated on one surface of the electromagnetic wave shielding layer for releasing heat; And a copper foil sheet layer laminated on the other surface of the electromagnetic wave shielding layer and totally reflecting electromagnetic waves incident thereon with the graphite sheet.

Description

TECHNICAL FIELD [0001] The present invention relates to a composite sheet for electromagnetic shielding and heat dissipation, and a manufacturing method thereof.

TECHNICAL FIELD The present invention relates to a multifunctional composite sheet having electromagnetic wave absorption, shielding, heat release, and shock absorption, and a method of manufacturing the same. More particularly, the present invention relates to a composite sheet having electromagnetic wave absorption, The present invention relates to a multifunctional composite sheet for electromagnetic shielding and heat dissipation and a method of manufacturing the same.

2. Description of the Related Art [0002] Recently, electronic devices have been rapidly miniaturized, and correspondingly, devices mounted on electronic devices are also accompanied by a demand for a technology for miniaturization while maintaining the same characteristics. In order to solve this problem, the development of technologies such as lowering the operating voltage of the device has been made, but the heat problem has not been completely solved. Rather, as the size of the elements is reduced and the operation voltage is lowered, the signal frequency and the noise frequency band overlap each other. As a result, problems such as electromagnetic interference (EMI) and electromagnetic compatibility And a solution to the problem is required.

In general, heat is generated mainly in semiconductor chipsets, display backlights, and battery parts of various electronic devices, and when the heat generated from the inside is not efficiently discharged, the reliability characteristics of the device are lowered due to heat generated, Lt; / RTI >

In order to solve this problem, various methods for releasing heat are applied to each element region. However, there are not many methods for simultaneously solving the EMI / EMC problem.

Recently, some methods for solving EMI / EMC problems have been proposed along with some heat dissipation, but there are insufficient complex solutions to heat emission and EMI / EMC problems.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide an electromagnetic shielding device capable of absorbing electromagnetic waves, shielding, And a heat-releasing multi-functional composite sheet, and a method for producing the same.

Accordingly, the present invention provides an electromagnetic shielding layer formed of at least one magnetic sheet layer for shielding and absorbing electromagnetic waves; A graphite sheet laminated on one surface of the electromagnetic wave shielding layer for releasing heat; And a copper foil sheet layer laminated on the other surface of the electromagnetic wave shielding layer and totally reflecting electromagnetic waves incident thereon with the graphite sheet.

According to the embodiment of the present invention, the electromagnetic wave shielding layer is formed of one magnetic sheet layer for shielding and absorbing electromagnetic waves, or two or more magnetic sheet layers for electromagnetic shielding and absorption, May include a structure in which two or more magnetic sheet layers having different impedance characteristics are laminated and / or a structure in which two or more magnetic sheet layers having the same impedance characteristic are laminated.

Here, the magnetic sheet layer is formed by laminating a plurality of magnetic sheet fabrics made of a composition containing at least one of a flat metal matrix soft magnetic powder and a spherical metal magnetic powder and having a heat releasing property, Or at least one amorphous ribbon (hereinafter, referred to as " amorphous ribbon ") is formed on a magnetic sheet layer made of a composition containing at least one of a flaky metal flake component and a spherical metal magnetic powder and optionally containing a heat- Amorphous Ribbon or Nano Crystaline Ribbon may be laminated and bonded to each other.

Each of the magnetic sheet layers manufactured as described above may be selectively disposed on any one of the lowermost layer and the uppermost layer of the electromagnetic wave shielding layer.

According to an embodiment of the present invention, an impact absorbing layer for shock absorption is integrally formed on one side of the electromagnetic shielding layer on which the electromagnetic wave shielding layer is laminated, and the removable film layer is removably adhered on one side of the graphite sheet , And a protective film layer for protecting the copper foil sheet layer is adhered and formed on one side of the copper foil sheet layer.

The present invention also provides a method of manufacturing a magnetic recording medium, comprising the steps of: forming an electromagnetic wave shielding layer including at least one magnetic sheet layer for shielding and absorbing electromagnetic waves; Bonding a graphite sheet for heat dissipation to one surface of the electromagnetic wave shielding layer; And depositing a copper foil sheet layer for total reflection of electromagnetic waves on the other surface of the electromagnetic wave shielding layer.

At this time, the process of forming the electromagnetic wave shielding layer may include a process of laminating and bonding two or more magnetic sheet layers for shielding and absorbing electromagnetic waves, for example, a process of forming two or more magnetic sheet layers having different impedance characteristics Forming a laminate by bonding and / or laminating two or more magnetic sheet layers having the same impedance characteristics to form a bond.

The copper foil sheet layer may be formed by integrally forming an electromagnetic wave shielding layer on one surface of the electromagnetic shielding layer by coating an impact absorbing layer for shock absorption.

Further, in the process of bonding and forming the graphite sheet, a pressure-sensitive adhesive layer is inserted between the electromagnetic wave shielding layer and the graphite sheet and a graphite sheet is laminated on one surface of the electromagnetic wave shielding layer, or a plurality of laminated magnetic sheet fabrics are thermally bonded When the magnetic sheet layer is manufactured, a graphite sheet is laminated on the surface of the laminated magnetic sheet, and simultaneously a thermo-compression bonded laminate is formed on one surface of the electromagnetic wave shielding layer.

The multifunctional composite sheet for electromagnetic shielding and heat release according to the present invention is attached to an electronic device and, when it is used, the heat is primarily radiated through the graphite sheet of the innermost layer close to the electronic device, Is totally reflected in the sheet layer and moves in the opposite direction, and is absorbed and shielded by the material characteristics of the electromagnetic wave shielding layer between the graphite sheet and the copper foil sheet layer, and is annihilated by heat radiation.

Such a multifunctional composite sheet of the present invention can improve electromagnetic wave absorption, shielding, heat release, and shock absorption function by adjusting the kind, lamination number, stacking order, and the like of the magnetic sheet layer constituting the electromagnetic wave shielding layer between the graphite sheet and the copper foil sheet layer And the like can be adjusted in various ways.

1 is a cross-sectional view showing a multi-functional composite sheet for electromagnetic wave shielding and heat release according to a first embodiment of the present invention
Fig. 2 is a cross-sectional view showing a multi-functional composite sheet for electromagnetic wave shielding and heat radiation according to a second embodiment of the present invention
3 is a cross-sectional view showing a multi-functional composite sheet for electromagnetic wave shielding and heat radiation according to a third embodiment of the present invention
4 is a schematic view showing a manufacturing process of a first magnetic sheet layer capable of constituting a multi-functional composite sheet according to an embodiment of the present invention
5 is a schematic view showing a manufacturing process of a second magnetic sheet layer capable of constituting a multi-functional composite sheet according to an embodiment of the present invention
6 is a schematic view showing a manufacturing process of a third magnetic sheet layer which can constitute a multi-functional composite sheet according to an embodiment of the present invention
7 is a schematic view showing a manufacturing process of a fourth magnetic sheet layer capable of constituting a multi-functional composite sheet according to an embodiment of the present invention
8 is a schematic view showing a manufacturing process of a fifth magnetic sheet layer capable of constituting a multi-functional composite sheet according to an embodiment of the present invention
9 is a schematic view showing a manufacturing process of a sixth magnetic sheet layer capable of constituting a multi-functional composite sheet according to an embodiment of the present invention
10 is a schematic view showing a manufacturing process of a seventh magnetic sheet layer capable of constituting a multi-functional composite sheet according to an embodiment of the present invention

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention.

1 to 3, a multifunctional composite sheet according to an embodiment of the present invention includes a release film layer 10, a graphite sheet 20, an electromagnetic wave shielding layer 30, an impact absorbing layer 40, A protective film layer 60, and a respective adhesive layer 70 for interlaminar adhesion, as shown in Fig.

The release film layer 10 is laminated on the upper surface of the graphite sheet 20 and may be formed of a polyethylene resin such as PET (polyethylene terephthalate) and may function to protect the graphite sheet 20.

The graphite sheet 20 is laminated on the lower surface of the release film layer 10 with the adhesive layer 70 sandwiched therebetween. By using a material such as graphite having high thermal conductivity, a sheet type And can radiate heat generated from the electronic device to the outside.

The electromagnetic wave shielding layer 30 is laminated on the lower surface of the graphite sheet 20 with the adhesive layer 70 sandwiched therebetween. The electromagnetic wave shielding layer 30 is configured to perform a function of absorbing and shielding electromagnetic waves generated in electronic equipment.

1 to 3, the electromagnetic wave shielding layer 30 may be formed by stacking one magnetic sheet layer 32 or two or more magnetic sheet layers 32 for shielding and absorbing electromagnetic waves, The magnetic sheet layer 32 may be a magnetic sheet layer having the same impedance characteristic or a magnetic sheet layer having different impedance characteristics.

When the electromagnetic wave shielding layer 30 is composed of a plurality of magnetic sheet layers 32 having different impedance characteristics, the incident electromagnetic waves sequentially pass through the magnetic sheet layer 32 having different impedance characteristics, The performance can be exerted in the broadband frequency domain. When the impedance passes through a plurality of layers different from each other, the behavior (characteristics) of the electromagnetic wave changes depending on the medium property of each layer.

The electromagnetic wave shielding layer 30 may be formed of one magnetic sheet layer 32 or a plurality of magnetic sheet layers 32 depending on the electronic device to be applied (that is, And the type and stacking order of the magnetic sheet layer 32 used at this time may also be changed according to the characteristics of the electronic device to be applied.

A detailed description of the magnetic sheet layer 32 constituting the electromagnetic wave shielding layer 30 will be described later.

The shock absorbing layer 40 is laminated on the lower surface of the electromagnetic wave shielding layer 30 with the adhesive layer 70 sandwiched therebetween and is made of urethane and polyethylene (PE), polypropylene (PP), polystyrene (PS ) Series copolymer, and foamed slurry which is prepared by mixing a carbonaceous filler in a proper ratio with a matrix material selected from a resin group and is foamed to form a foam type, (The dimensions of the multifunctional composite sheet are stably maintained), and the function of preventing the inflow of contaminants can be performed.

Here, the mixing ratio of the matrix material and the filler may vary depending on the type of the selected matrix material and the filler.

The copper foil sheet layer 50 is integrally laminated on the lower surface of the impact absorbing layer 40. The copper foil sheet layer 50 is made of a sheet type using copper or the like capable of reflecting electromagnetic waves and passes through the electromagnetic wave shielding layer 30, And reflects the electromagnetic wave in the direction opposite to the incidence direction.

Here, the one surface of the copper foil sheet layer 50 is formed of a rough, non-glossy mat type to improve the bonding strength with the impact absorbing layer 40 to enhance reliability, and the other surface (opposite surface) Is formed in a shiny type with a smooth and glossy surface and has a neat structure.

Since the impact absorbing layer 40 is formed by directly coating the foam slurry on the matte side of the copper foil sheet layer 50, the manufacturing process of the multifunctional composite sheet is reduced and the adhesion strength of the copper foil sheet layer 50 is high Can be made into an improved integral sheet.

Here, the impact absorbing layer 40 may be formed to have a thickness of 50 to 500 μm, and the copper foil sheet layer 50 may have a thickness of 10 to 100 μm.

The protective film layer 60 is provided to protect the copper foil sheet layer 50 formed on the outermost layer of the multifunctional composite sheet and has a laminated structure on the lower surface of the copper foil sheet layer 50 with the adhesive layer 70 therebetween And can be formed into a sheet type having a thickness of approximately 10 mu m using a material such as polyester.

Further, each adhesive layer 70 for interlayer adhesion may be formed by applying a conventional adhesive or may be composed of a laminate having adhesive properties on both sides, and may have a thickness of about 10 mu m.

For example, the adhesive layer 70 may be formed by coating a commonly used adhesive on the upper surface of the protective film layer 60, the shock absorbing layer 40, the electromagnetic wave shielding layer 30, the graphite sheet 20, Or a commonly used adhesive may be applied between the protective film layer 60 and the copper foil sheet layer 50 or between the impact absorbing layer 40 and the electromagnetic wave shielding layer 30 or between the electromagnetic wave shielding layer 30 and the graphite sheet 30, Between the graphite sheet 20 and the release film layer 10, as shown in Fig.

Hereinafter, the manufacturing process of the magnetic sheet layer 32 constituting the electromagnetic wave shielding layer 30 will be described with reference to FIGS. 4 to 10.

First, the manufacturing process of the first magnetic sheet layer which can constitute the electromagnetic wave shielding layer 30 will be described with reference to FIG.

First, any one of the magnetic powders such as FeSiCr, FeSiAl, and FeSi is selected, and the massive metal magnetic powder having an average particle size of about 30 to 70 mu m is pulverized using an apparatus such as an impact mill, ball mill, pearl mill, Mu] m and a mean particle diameter of 40 to 60 [mu] m.

The produced flat metal softening component horses are coated with a resin such as urethane resin, silicone rubber, NBR (Nitrile Butadiene Rubber), SBR (Styrene Butadiene Rubber), EPDM (Ethylene Propylene Diene Monomer), and rubber system or Epoxy And mixed with an organic binder to prepare a liquid slurry.

The prepared liquid slurry (liquid composite composition) is coated on a PET film coated with a heat-resistant releasing agent in a comma coater at a predetermined thickness and dried to prepare a dried magnetic sheet fabric having a thickness of 50 to 150 mu m.

The PET film was peeled off from the fabricated magnetic sheet fabric as described above, and the fabric of the magnetic sheet from which the PET film was removed was cut to a predetermined size, and then a plurality of sheets were stacked in a multi-layer structure.

The magnetic sheet fabric laminated by the above-described method is put into a press-press mold, and is pressurized (heated and pressed) at a temperature of 120 ° C. to 220 ° C. and a pressure of 100 to 160 kgf / cm 2 for 10 to 30 minutes, Density magnetic sheet (first magnetic sheet layer) is produced by cooling in a pressurized state (i.e., cooling and compression bonding) to suppress the expansion.

The produced high-density magnetic sheet (first magnetic sheet layer) finally has a flexible shape when it is produced by mixing a resin and a rubber-based organic binder in a flat metal soft magnetic powder, Epoxy-based organic binder is finally mixed with the binder.

Next, a manufacturing process of the second magnetic sheet layer capable of constituting the electromagnetic wave shielding layer 30 will be described with reference to FIG.

(AlN), boron nitride (BN), graphite powder, carbon black powder, and the like are added to the composition for producing the first magnetic sheet layer (the liquid composite composition) A filler made of a material having a heat releasing property is mixed at an appropriate ratio to prepare a composition for producing a second magnetic sheet layer having a heat releasing property.

At this time, the mixing ratio between the composition for manufacturing the first magnetic sheet layer and the filler can be changed and adjusted according to the required characteristics of the electromagnetic wave shielding layer, for example, from 1: 9 to 9: 1. In order to increase the magnetic property, it is possible to increase the proportion of the composition for producing the first magnetic sheet layer and increase the proportion of the filler when it is desired to improve the heat radiation property. It can be adjusted appropriately according to the applied environment.

A second magnetic sheet layer is prepared using the composition thus prepared, wherein the second magnetic sheet layer is produced by a process comprising the steps of: preparing a first magnetic sheet layer instead of a liquid composite composition for producing the first magnetic sheet layer; Is the same as the production process of the first magnetic sheet layer, except that a composition in which the filler is further mixed with a liquid composite composition for production is used.

Next, the manufacturing process of the third magnetic sheet layer will be described with reference to FIG.

A third magnetic sheet layer is prepared using CIP (Carbonyl Iron Powder) having an average particle diameter of about 3 to 20 占 퐉 or Fe-based spherical magnetic powder having an average particle diameter of about 10 to 50 占 퐉.

The third magnetic sheet layer using the metal spherical magnetic powder is superior to the first magnetic sheet layer using the flat metal flake component and has better frequency characteristics than the first magnetic sheet layer, It is possible to realize an electromagnetic wave shielding layer having an electromagnetic wave absorption and shielding function having broad band characteristics.

The manufacturing process of the third magnetic sheet layer is the same as the manufacturing process of the first magnetic sheet layer except that a spherical metal magnetic powder (metal spherical magnetic powder) is used instead of a flat metal soft magnetic component.

Next, the manufacturing process of the fourth magnetic sheet layer will be described with reference to Fig.

The fourth magnetic sheet layer is manufactured using the magnetic powder obtained by mixing the flat metal soft magnetic material element used for manufacturing the first magnetic sheet layer and the metal spherical magnetic powder used for manufacturing the third magnetic sheet layer do.

The fourth magnetic sheet layer may be manufactured by a method comprising the steps of mixing a magnetic powder of a flat metal phase and a metal spherical magnetic powder used for producing a third magnetic sheet layer in place of a flat metal soft magnetic component, Is the same as the manufacturing process of the first magnetic sheet layer.

At this time, the mixing ratio of the flat metal flake component and the metal spherical magnetic powder may be changed and adjusted according to the required characteristics of the electromagnetic wave shielding layer, and may be, for example, from 1: 9 to 9: 1.

A flat metal flake has a relatively high magnetic permeability and excellent electromagnetic characteristics in a low frequency band, but has a lower current overlapping characteristic than a metal spherical magnetic powder. On the other hand, the metal spherical magnetic powder has a low magnetic permeability, so that the electromagnetic characteristics in the same low frequency band are lower than those of the flat metal flake components, but the current superimposition characteristics are higher. Therefore, the mixing ratio of the two materials can be appropriately adjusted according to the properties to be implemented and the environment to which they are applied.

Next, the manufacturing process of the fifth magnetic sheet layer will be described with reference to Fig.

A filler comprising a liquid composite composition (containing a metal spherical magnetic powder) used for producing the third magnetic sheet layer and a material having a heat releasing property used for producing the second magnetic sheet layer, To prepare a fifth magnetic sheet layer.

At this time, the mixing ratio between the liquid composite composition containing the metal spherical magnetic powder and the filler can be changed and adjusted according to the required characteristics of the electromagnetic wave shielding layer, for example, from 1: 9 to 9: 1. The liquid composite composition containing the metal spherical magnetic powder has excellent electromagnetic wave shielding and absorption characteristics and the filler has excellent heat dissipation property. Therefore, when it is desired to improve electromagnetic wave shielding and absorption characteristics, the ratio of the liquid composite composition is increased , And the ratio of the filler is increased when the heat dissipation property is to be improved. The mixing ratio of the two materials can be appropriately adjusted according to the applied environment.

The fifth magnetic sheet layer may be manufactured by a process comprising the steps of: preparing a liquid phase composition for use in producing a third magnetic sheet layer instead of a liquid composite composition (containing a flat metal phase transition component) used for producing the first magnetic sheet layer; Except that a composite composition (containing a spherical magnetic metal powder) is used as the magnetic powder.

Next, the manufacturing process of the sixth magnetic sheet layer will be described with reference to Fig.

(Containing a spherical metallic magnetic substance component) used for producing the first magnetic sheet layer and a liquid composite composition (containing a metallic spherical magnetic powder used for producing the third magnetic sheet layer) And a filler made of a material having a heat releasing property used for producing the second magnetic sheet layer are mixed at an appropriate ratio to prepare a sixth magnetic sheet layer.

At this time, the mixing ratio of the liquid composite composition containing the flaky metal flake component, the liquid composite composition containing the metal spherical magnetic powder, and the filler can be changed and adjusted according to the required characteristics of the electromagnetic wave shielding layer.

For example, when a liquid composite composition containing the flaky metal flake component termination is used as the base of the sixth magnetic sheet layer, the liquid composite composition containing the flaky metal flake retardant component is applied to the sixth magnetic sheet layer Wherein the mixing ratio of the liquid composite composition containing the metal spherical magnetic powder and the filler is 1: 9 to 9: 1.

Further, for example, when the liquid composite composition containing the metal spherical magnetic powder is used as the base of the sixth magnetic sheet layer, the liquid composite composition containing the metal spherical magnetic powder is used to produce the sixth magnetic sheet layer The mixing ratio of the filler to the liquid composite composition containing the flaky metal flake component may be 1: 9 to 9: 1.

Further, for example, when the filler is used as the base of the sixth magnetic sheet layer, it is preferable that the filler is at least 50% of the composition used for producing the sixth magnetic sheet layer, The mixing ratio of the liquid composite composition and the liquid composite composition containing the metal spherical magnetic powder may be 1: 9 to 9: 1.

The mixing ratio of the above three materials can be appropriately adjusted according to the applied environment.

The manufacturing process of the sixth magnetic sheet layer is used for manufacturing the first magnetic sheet layer in the composition used for producing the fifth magnetic sheet layer instead of the composition used for manufacturing the fifth magnetic sheet layer Is the same as that of the fifth magnetic sheet layer except that a liquid composite composition (containing a flat metal matrix component) is further mixed and used.

Finally, the manufacturing process of the seventh magnetic sheet layer will be described with reference to FIG.

A seventh magnetic sheet layer is prepared using amorphous ribbons or Nano Crystaline ribbons having high magnetic permeability.

A magnetic sheet fabric having a certain thickness is prepared by using any one of the compositions selected from the compositions used for manufacturing the first to sixth magnetic sheet layers, and then the prepared magnetic sheet fabric is cut to a predetermined size.

Next, at least one amorphous ribbon or Nano Crystaline Ribbon is laminated on the fabricated magnetic sheet fabric, and the resulting laminate is put into a press-pressing mold, and subjected to a heat-pressing process and a cold-pressing process, A seventh magnetic sheet layer) is produced.

Alternatively, the magnetic sheet may be formed by laminating a plurality of layers of the cut magnetic sheet fabrics and thermo-compression-bonding the magnetic sheets (any one of the first to sixth magnetic sheet layers), that is, It is also possible to manufacture a seventh magnetic sheet layer by a lamination process using a roller and an amorphous ribbon or a Nano Crystaline Ribbon cut to a predetermined size and a predetermined size.

At this time, the amorphous ribbons or the Nano Crystaline ribbons have an advantage of forming a magnetic sheet layer for shielding and absorbing electromagnetic waves together with the magnetic sheet fabric, thereby forming a more excellent electromagnetic wave shielding function .

The amorphous ribbons are made of amorphous ribbons and the nano crystal ribbons are made of amorphous ribbons which are subjected to a heat treatment process at about 300 to 600 ° C to form ribbons having nanoparticles Type.

The electromagnetic shielding layer 30 may be formed by selectively using the first to seventh magnetic sheet layers as described above. The electromagnetic wave shielding layer 30 may be formed of a magnetic sheet selected from the first to seventh magnetic sheet layers, Characteristics such as electromagnetic wave shielding, absorption, reflection, and heat release can be adjusted according to the type of layer, the number of layers, and the stacking order.

For example, the electromagnetic wave shielding layer 30 constituting the multifunctional composite sheet may be constituted of a single layer using any one of the magnetic sheet layers selected from the first to seventh magnetic sheet layers, 7 magnetic sheet layers, or may be formed in a multi-layer structure using two or more magnetic sheet layers selected from the first to seventh magnetic sheet layers, and in addition to this, And can be stacked in various structures.

Therefore, when the electromagnetic wave shielding layer 30 is formed in a multilayer structure, the magnetic sheet layer selected from the first to seventh magnetic sheet layers may be selectively formed on any one of the lowermost layer to the uppermost layer of the electromagnetic wave shielding layer 30 .

In other words, the electromagnetic shielding, absorption, reflection, and reflection characteristics required by the electronic device using any one of the magnetic sheet layers or the two or more magnetic sheet layers selected from the first to seventh magnetic sheet layers according to the function to be implemented and augmented It is possible to form the electromagnetic wave shielding layer 30 having characteristics such as heat dissipation and the like. At this time, it is possible to use the same magnetic sheet layer and / or different magnetic sheet layers repeatedly depending on the characteristics required in the electronic device, The kind of the magnetic sheet layer, the number of layers and the stacking order can be adjusted according to the characteristics required in the apparatus.

When the electromagnetic shielding layer 30 is composed of a plurality of magnetic sheet layers, the magnetic sheet layers are put into a press-pressing die, and hot-pressed under the conditions of high temperature and high pressure, Can be manufactured by a press method.

The multi-functional composite sheet according to the embodiment of the present invention including the electromagnetic shielding layer 30 may be manufactured by the following manufacturing process.

First, an electromagnetic wave shielding layer 30 including a magnetic sheet layer 32 for shielding and absorbing electromagnetic waves is formed and formed.

The electromagnetic shielding layer 30 may be formed of any one of the first to seventh magnetic sheet layers for shielding and absorbing electromagnetic waves in consideration of electromagnetic wave shielding, absorption, reflection, (See Fig. 1), or formed of two or more magnetic sheet layers 32 selected from the first to seventh magnetic sheet layers (see Figs. 2 and 3).

When the electromagnetic shielding layer 30 is formed by using two or more magnetic sheet layers 32, a process of laminating two or more magnetic sheet layers 32 and joining them in a hot press method may be used. For example, The electromagnetic shielding layer 30 may be formed and formed by laminating and bonding the magnetic sheet layers having the same impedance characteristics and / or laminating and bonding the magnetic sheet layers having different impedance characteristics.

After the electromagnetic wave shielding layer 30 is manufactured, a graphite sheet 20 is laminated on one side of the electromagnetic wave shielding layer 30 with the adhesive layer 70 interposed therebetween, and an adhesive layer 70 are sandwiched between the graphite sheet 20 and the copper foil sheet layer 50 on both sides of the electromagnetic wave shielding layer 30 by pressing them using a roller.

At this time, the impact absorption layer 40 is integrally formed on one surface (upper surface) of the copper foil sheet layer 50 so that the impact absorption layer 40 is laminated between the copper foil sheet layer 50 and the electromagnetic wave shielding layer 30 .

Alternatively, the electromagnetic shielding layer 30 and the graphite sheet 20 may be bonded to each other without using the adhesive layer 70 as shown in Fig. In this case, in the process of manufacturing the magnetic sheet layer 32 constituting the electromagnetic wave shielding layer 30, the graphite sheet 20 is laminated on the surface of the magnetic sheet which has not been thermally pressed yet, And the graphite sheet 20 is bonded to one surface of the magnetic sheet layer 32 while the magnetic sheet layer 32 is produced.

Alternatively, in a process of stacking and bonding a plurality of magnetic sheet layers 32 constituting the electromagnetic wave shielding layer 30, a graphite sheet 20 is laminated on the uppermost magnetic sheet layer 32 It is also possible to bond the graphite sheet 20 to one side of the electromagnetic wave shielding layer 30 by thermocompression bonding.

When the electromagnetic shielding layer 30 and the graphite sheet 20 are bonded to each other without using the adhesive layer 70, the thickness of the multi-functional composite sheet is reduced by the thickness of the adhesive layer 70, have.

The release film layer 10 is laminated on one side (upper surface) of the graphite sheet 20 with the adhesive layer 70 therebetween and the adhesive layer 70 is formed on one surface (lower surface) of the copper foil sheet layer 50, A release film layer 10 is adhered to the graphite sheet 20 and a protective film layer 60 is formed on the lower surface of the copper foil sheet layer 50. The protective film layer 60 is laminated on the protective film layer 60, ).

The multifunctional composite sheet according to the present invention thus manufactured is used after attaching to the electronic device after removing the release film layer 10. The heat is primarily released through the graphite sheet 20 in the innermost layer close to the electronic device The electromagnetic waves incident on the inside of the electromagnetic shielding layer 30 are totally reflected in the opposite direction by the copper foil sheet layer 50 of the outermost layer, It is absorbed and shielded by material characteristics and is annihilated by heat radiation.

In addition, in the case of the copper foil sheet layer 50, electromagnetic waves are totally trapped and trapped between the graphite sheet 20 and the copper foil sheet layer 50 so as to be discharged as heat. In addition, And has a straight-line heat emission characteristic.

For example, in the case of the graphite sheet 20, the heat conduction characteristics are excellent both in the lateral and longitudinal directions parallel to the plane and in various directions perpendicular to the plane, but in the case of the copper foil sheet layer 50, The heat conduction characteristic is excellent only in one direction of the heat transfer characteristic and the heat radiation characteristic of the linearity is obtained.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the scope of the present invention is not limited to the disclosed exemplary embodiments. Modifications are also included in the scope of the present invention.

10: release film layer
20: Graphite sheet
30: electromagnetic wave shielding layer
32: magnetic sheet layer
40: shock absorbing layer
50: copper foil sheet layer
60: protective film layer
70: Adhesive layer

Claims (20)

An electromagnetic wave shielding layer formed of at least one magnetic sheet layer for shielding and absorbing electromagnetic waves;
A graphite sheet laminated on one surface of the electromagnetic wave shielding layer for releasing heat;
A copper foil sheet layer laminated on the other surface of the electromagnetic wave shielding layer and totally reflecting the electromagnetic wave incident therebetween;
Wherein the composite sheet for electromagnetic shielding and heat dissipation is formed of a thermoplastic resin.
The method according to claim 1,
Wherein the electromagnetic wave shielding layer is formed of one magnetic sheet layer for shielding and absorbing electromagnetic waves or formed of a structure in which two or more magnetic sheet layers for shielding and absorbing electromagnetic waves are laminated. Composite sheet.
The method according to claim 1,
Wherein the electromagnetic wave shielding layer comprises a structure in which two or more magnetic sheet layers having different impedance characteristics are laminated.
The method according to claim 1,
Wherein the electromagnetic wave shielding layer is formed to include a structure in which two or more magnetic sheet layers having the same impedance characteristics are laminated.
The method according to claim 1,
Characterized in that the electromagnetic wave shielding layer selectively includes a magnetic sheet layer made of a composition containing at least one of a flat metal flake component and a spherical metal magnetic powder and having a heat releasing property. Multifunctional composite sheet for shielding and heat release.
The method according to claim 1,
Wherein the electromagnetic wave shielding layer comprises at least one amorphous ribbon (hereinafter referred to as " amorphous ribbon ") on a magnetic sheet layer made of a composition containing at least one of a flat metal flake component and a spherical metal magnetic powder, ) Or a nano crystal ribbon (Nano Crystaline Ribbon) laminated and bonded to each other to form a magnetic sheet layer.
The method according to claim 5 or 6,
Wherein the flat metal phase transition metal powder is produced by pulverizing one of magnetic powders selected from magnetic powders of FeSiCr, FeSiAl and FeSi into flat particles.
The method according to claim 5 or 6,
Wherein the spherical metal magnetic powder is a CIP (Carbonyl Iron Powder) or an Fe-based spherical magnetic powder.
The method according to claim 5 or 6,
Wherein the filler is one or more selected from the group consisting of alumina, aluminum nitride (AlN), boron nitride (BN), graphite powder and carbon black powder. Composite sheet.
The method according to claim 5 or 6,
Wherein the magnetic sheet layer is selectively disposed on any one of the lowermost layer and the uppermost layer of the electromagnetic wave shielding layer.
The method according to claim 1,
Wherein the copper foil sheet layer is formed integrally with an impact absorbing layer for shock absorption on one surface of the electromagnetic shielding layer.
The method according to claim 1,
Wherein the graphite sheet has a removable release film layer on one side thereof and a protective film layer for protecting the copper foil layer is attached to the one side of the copper foil sheet layer. Sheet.
Forming an electromagnetic wave shielding layer including at least one magnetic sheet layer for shielding and absorbing electromagnetic waves;
Bonding a graphite sheet for heat dissipation to one surface of the electromagnetic wave shielding layer;
Depositing a copper foil sheet layer for total reflection of electromagnetic waves on the other surface of the electromagnetic wave shielding layer;
The method of manufacturing a multi-functional composite sheet for electromagnetic wave shielding and heat dissipation according to claim 1,
14. The method of claim 13,
Wherein the step of forming the electromagnetic wave shielding layer comprises the step of laminating and bonding two or more magnetic sheet layers for shielding and absorbing electromagnetic waves.
14. The method of claim 13,
Wherein the step of forming the electromagnetic wave shielding layer comprises the step of laminating and bonding two or more magnetic sheet layers having different impedance characteristics to each other.
14. The method of claim 13,
Wherein the step of forming the electromagnetic wave shielding layer comprises the step of laminating and bonding two or more magnetic sheet layers having the same impedance characteristic.
The method according to any one of claims 13 to 16,
Wherein the magnetic sheet layer is formed by laminating a plurality of magnetic sheet fabrics made of a composition containing at least one of a flat metal matrix component and a spherical metal magnetic powder and having a heat releasing property, Wherein the heat-radiating sheet is made of a thermoplastic resin.
The method according to any one of claims 13 to 16,
Wherein the magnetic sheet layer comprises at least one amorphous ribbon (hereinafter, also referred to as " amorphous ribbon ") on a magnetic sheet layer made of a composition containing at least one of a flat metal matrix component and a spherical metal magnetic powder, ) Or a nano crystal ribbon (Nano Crystaline Ribbon) laminated and bonded to each other. The method of manufacturing a multi-functional composite sheet for electromagnetic wave shielding and heat radiation according to claim 1,
14. The method of claim 13,
Wherein the copper foil sheet layer is integrally formed by coating an impact absorbing layer for shock absorption on one surface of the electromagnetic shielding layer.
14. The method of claim 13,
In the process of bonding and forming the graphite sheet, a pressure-sensitive adhesive layer is inserted between the electromagnetic wave shielding layer and the graphite sheet, and a graphite sheet is laminated on one surface of the electromagnetic wave shielding layer. Alternatively, A composite sheet for electromagnetic shielding and heat releasing according to claim 1, wherein a graphite sheet is laminated on the surface of the laminated magnetic sheet at the time of producing the sheet layer and simultaneously thermally bonded to form a graphite sheet on one surface of the electromagnetic shielding layer Gt;
KR1020150056938A 2015-04-23 2015-04-23 Electro magnetic shielding sheet and manufacturing method of the same KR20160126188A (en)

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