KR101499216B1 - Production rate improved method of manufacturing composite magnetic sheet and its application. - Google Patents

Abstract

A green sheet unit including an aluminum plate, a release film, and a green sheet is formed. The release film of the present invention is manufactured by coating a film prepared by adding silica to polyethylene terephthalate (PET) and coating the film with a gas generated in the thermocompression bonding process. So that the residual solvent is discharged in the surface direction. Accordingly, the present invention provides a method of manufacturing a high magnetic permeability absorber by improving the density of a composite magnetic sheet that can be used as an absorber by using a thermocompression bonding method.
In addition, a plurality of compound magnetic sheets can be mounted at one time during thermocompression to increase the production efficiency, and the gas generated in the thermocompression bonding process can be efficiently removed to improve the uniformity of the surface pattern and characteristics.

Description

METHOD OF MULTIPLE MAGNETIC SHEET MANUFACTURING COMPOSITE MAGNETIC SHEET AND ITS APPLICATION.

The present invention relates to a method for manufacturing a sheet having improved permeability, and a composite magnetic sheet and an electromagnetic wave absorber using the same. The composite magnetic sheet manufactured according to the present invention can be used as an EMI (Electro-Magnetic Interference) noise absorbing material, a magnetic material for a digitizer, a magnetic material for NFC, a wireless power charging (WPC) It can also be used as a magnetic material or a heat-resistant material.

In order to obtain a composite magnetic sheet which can be used as a high permeability electromagnetic wave absorber or the like, it is effective to improve the density.

In order to improve the density of the sheet, the cross-linking step can be carried out while being pressurized using a hot press. Examples of the method for improving the density include a rolling method including a plurality of rolls, a method including a polymer rubber roll, a method using an endless belt, a method using a metal roll ), And the like.

A method capable of continuous operation using rolls has a good working efficiency, but has a limitation in obtaining a composite magnetic sheet having a high permeability.

On the other hand, a cross-linking process using a press has a disadvantage in that a composite magnetic sheet having a high permeability can be obtained, but a plurality of sheets can not be manufactured at once.

With the development of information communication technology and digital signal processing technology, products such as digital devices and IT devices are equipped with advanced functions such as light weight, miniaturization, high speed and wide bandwidth.

With the spread of such advanced electronic and electric appliances, the concentration of electromagnetic waves in the surrounding environment is increased, which causes malfunction of electronic and electric devices, and at the same time, causes many problems such as being pointed out as a factor that can harm the human body.

Transients, swells, and surges, which act as electrical noise sources in the industrial field, are affected by malfunctions, such as damage, to the automation equipment and power stabilizer of the production site, Causing a huge loss in the industry sector that causes the downsides.

To solve these noise problems, it is necessary to use anti-noise components. Demand for anti-noise components is higher than that of general electronic components, and demand is expected to steadily increase in the future.

Currently, noise countermeasures are widely used in handheld devices such as mobile phones, computers, displays, and digital cameras, and their use is increasing in industrial devices and automobiles.

There are numerous combinations to eliminate the various noise generated. EMC design and countermeasure techniques are complex technologies that require a lot of knowledge and experience to be harmonized.

Therefore, it is a very difficult and practical study, and it is required to combine the countermeasures against the countermeasures and the countermeasures. Thus, the applicability of correcting and preparing the countermeasure parts according to noise and appropriately applying them to the required areas is increasing.

EMC (Electro-Magnetic Compatibility) refers to electromagnetic compatibility or electromagnetic compatibility. It refers to electromagnetic interference (electromagnetic noise or noise) generated by electronic equipment, which can cause malfunctions in communication networks, (EMI) and Electromagnetic Susceptibility (EMS), which are implemented to prevent electromagnetic interference (EMI).

Electromagnetic interference (EMI) is an electromagnetic interference (EMI) or electromagnetic interference. Electromagnetic waves generated incidentally from electronic or electric devices are radiated into the air or transmitted to signal lines or power lines. . ≪ / RTI > Also, EMS is called electromagnetic wave protection, electromagnetic wave resistance or electromagnetic wave sensitivity. It is the ability of electronic, electric, or system to operate without deterioration in electromagnetic wave environment. When electromagnetic and electric device receives electromagnetic wave interference from the outside The degree of influence is shown.

In other words, it minimizes the electromagnetic waves emitted from the electric and electronic devices to the outside to reduce the sensitivity to external electromagnetic interference without causing electromagnetic interference to other devices, thereby enhancing electromagnetic wave immunity to the device and satisfying the EMC.

In addition, a digitizer is an input device used for reading coordinate data, which is analog data of an input original, and inputting a design drawing or a figure in a digital form to a computer.

X, and Y positions, and it is composed of a rectangular wide flat device or a cursor device with a pen or a button used thereon. It is originally a device that converts analog data to digital format. Digitizers represent functions, and tablets represent plate-like shapes. Now, small-sized ones that are used by putting large, high-resolution models on a digitizer or tabletop are often called tablets. The simplest digitizer is a touch panel that operates by pressing a pen or finger on the menu on the panel.

A digitizer is a device that can input X and Y positions and is composed of a rectangular wide flat device and a line cursor with a stylus or button on it, ) Device. When the user moves the pen or the cursor, the coordinate information is automatically read by the base plate and transferred to the screen storage area of the computer system. When the user presses the stylus or the button of the position display table, the corresponding command is executed. Used to enter pictures, diagrams, design drawings, etc.

Depending on the structure, it is divided into automatic and manual type. In manual mode, there are a key-tree method of reading the position by a rotary encoder or a linear scale, and a precursor method of reading by a cursor.

The image of the photograph or the line of the pattern is decomposed into electronic bits, stored in a computer, stored and reproduced when necessary to reproduce the original image. It is used when inputting graphic data to a computer or modifying a graphic on the graphic display screen.

The digitizer also converts the code in the same way as a barcode reader, but it is convenient because you can directly input the figure drawn on the ground so that the figure drawn by the person or machine can be input directly without using a separate input device. In recent years, a three-dimensional digitizer capable of inputting stereoscopic data has also been developed.

Researches on magnetic composite materials have been continuing to produce composite magnetic sheets that can be used for such applications.

Japanese Patent Application No. 10-1113624 relates to a method of manufacturing a magnetic sheet and a magnetic sheet, and more particularly, to a flaky powder for an electromagnetic wave absorber using a nano-sized magnetic material and a method of manufacturing the same. More specifically, the present invention relates to a method for producing a magnetic sheet suitable for use in an IC card or an IC tag for suppressing electromagnetic noise, and a magnetic sheet produced by the method. In producing the magnetic sheet, a magnetic paint prepared by mixing at least a flat soft magnetic powder and a polymer binder dissolved in a solvent is coated on a predetermined substrate and then dried to form a magnetic sheet. Then, the magnetic sheet formed by drying is further coated with a magnetic paint and dried. In this way, a very high-quality magnetic sheet can be produced with high productivity. However, there remains a need for a process that simplifies the process and improves the production rate.

In order to obtain a composite magnetic sheet which can be used as a high permeability electromagnetic wave absorber, it is effective to improve the density.

In order to improve the density of the sheet, it is possible to improve the density through a cross-linking process while pressurizing using a hot press. In addition to the hot pressing method, there are various methods for improving the density, such as a rolling method including a plurality of rolls, a method including a polymer rubber roll, a method using an endless belt, and a method using a metal roll.

A method capable of continuous operation using rolls has good working efficiency, but has a limitation in obtaining a high permeability.

The cross-linking process using a press has a disadvantage in that a high permeability can be obtained, but a large number of sheets can not be produced at once.

That is, the crosslinking gas generated during the crosslinking process can not escape between the heat plate and the sheet, causing a pattern on the surface of the sheet or causing the property to deteriorate.

In order to solve this problem, in the conventional manufacturing method, the generated gas is escaped by slightly lifting the heat plate while maintaining the vacuum around the heat plate. However, when a plurality of sheets are stacked to manufacture a plurality of sheets at one time , A problem arises in that the gas generated due to the self weight of the green sheet can not escape in the method of slightly lifting the heat plate.

In order to solve such problems, the present invention provides a method of manufacturing a metal plate, comprising the steps of preparing a metal powder, a binder, a plurality of air release films, a plurality of aluminum plates, mixing and dispersing a metal powder and a binder, (N + 1) release films and n green sheets (release films) are formed on the upper surface of the aluminum plate so that the green sheet is present between the two release films. Forming a green sheet unit by alternately laminating green sheets on the uppermost release film and then stacking the aluminum sheets on the uppermost release film to form a green sheet unit; A step of laminating m units, a step of thermocompression bonding the plurality of stacked green sheet units under pressure with a press, A step of cooling a green sheet unit while maintaining the pressure of the press, and a step of removing press pressure from the cooled green sheet unit It is possible to do.

The release film of the present invention is manufactured by coating a film prepared by adding silica to polyethylene terephthalate (PET) and coating the film with a gas generated in the thermocompression bonding process. Unevenness is formed so that the remaining solvent is discharged.

The method of producing a composite magnetic sheet according to the present invention proposes a method of manufacturing a high permeability absorber by improving the density of a composite magnetic sheet which can be used as an absorber by using a thermocompression method.

In addition, a plurality of compound magnetic sheets can be mounted at one time during thermocompression to increase the production efficiency, and the gas generated in the thermocompression bonding process can be efficiently removed to improve the uniformity of the surface pattern and characteristics.

1 shows a method of manufacturing a composite magnetic sheet according to the present invention.
Fig. 2 shows a conventional method for producing a composite magnetic sheet.
FIG. 3 shows a path through which a gas and a residual solvent are discharged in the method of manufacturing a composite magnetic sheet according to the present invention.
Fig. 4 shows a lamination step in the method for producing a composite magnetic sheet according to the present invention.
5 shows a cross-sectional view of a composite magnetic sheet according to the present invention.

FIG. 1 shows a method for manufacturing a composite magnetic sheet 400 according to the present invention.

The metal powder 410 and the binder 420 may be mixed and dispersed to prepare a metal powder 410, a binder 420, a plurality of air release films 200 and a plurality of aluminum plates 300, The green sheet 100 is formed between the two release films 200 at the upper portion of the aluminum plate 300 so that the green sheet 100 N + 1 pieces of the release film 200 and n pieces of the green sheet 100 are alternately stacked on the uppermost release film 200, A step of forming a green sheet unit 1000 by stacking the aluminum sheet 300 again, a step of stacking m pieces of the green sheet unit 1000, Pressing the plurality of stacked green sheet units 1000 under pressure with a press, A step of cooling the thermo-compressed green sheet unit 1000 while maintaining the pressure of the press, pressing the green sheet unit 1000 in the cooled green sheet unit 1000, (Press) pressure,

It is possible that the gas generated by the thermocompression bonding step and the residual solvent are discharged in the direction of the plane through the release film 200 so as to be a thermocompression step consisting of a single compression without a pressing process .

In the conventional method for manufacturing a composite magnetic sheet, a plurality of green sheets are stacked in order to discharge gas generated during thermocompression in a pressing step, and then a press is performed so that gas generated during thermocompression can be discharged. And a step of pumping.

However, if a plurality of green sheets are laminated at one time, there is a problem that the gas generated due to the self weight of the green sheet can not escape by pumping the press .

In order to solve such a problem, in the present invention, a release film (200) capable of ensuring air permeability in the plane direction is used, and a gas generated without a pumping step, which is a pressing process, Allow them to escape.

In more detail, the release film 200 is manufactured by coating a film made by adding silica to polyethylene terephthalate (PET) by coating silicon, Unevenness is formed so that gas (gas) generated in the process is discharged in the surface direction.

It is possible to ensure the ventilation in the plane direction through the space between the concavities and convexities and to serve as a path through which the gas generated in the thermocompression step can be discharged to the outside.

As can be seen from the path through which the gas and the residual solvent are discharged in the composite magnetic sheet manufacturing method of FIG. 3, the gas generated in the thermocompression bonding process, that is, the crosslinking gas generated during the crosslinking process and the residual solvent, Are dispersed in the vertical direction of the green sheet (100) by the applied pressure and gathered out. At this time, in the conventional method for producing a composite magnetic sheet in which the release film 200 is not used, the gas and the residual solvent discharge passage are not secured, which may interfere with the densification of the composite magnetic sheet.

Further, the breathable release film 200 is excellent in flexibility and is easy to remove the breathable release film 200 after the composite magnetic sheet is manufactured. Silicon coated on the breathable release film 200 can increase the releasing force of the breathable release film 200.

The aluminum plate 300 may be a physical barrier having a production control function in units of the green sheet unit 1000.

If the aluminum plate 300 is not included, for example, when foreign matter enters the stacked green sheets and a bad composite magnetic sheet is generated, a plurality of stacked green sheet units ) 1000 can not be used as defective.

In order to prevent this, only one green sheet unit 1000, which is divided into two defective aluminum sheets 300, is removed and another green sheet unit 1000 is removed. Is to be made available.

The metal powder 410 may include at least one or more of Fe, Si, Al, Cr, Ni, and Mn.

More preferably from 8 to 10 wt% of Fe - Si, from 4 to 7 wt% of Al, or from Fe - Si - Al (sandstead series) and Fe - Si - Cr (Ferro Alloy series) 10 to 12 wt% -Cl to 1 to 3 wt% is most preferable, but is not limited thereto.

Shear stress should not be applied to the powder during the flattening process of the metal powder (410).

This is because when the powder is stressed by the shear stress, the permeability drops.

In order to remove the stress obtained during the flattening process of the metal powder 410, it is preferable to perform the heat treatment in an inert gas atmosphere. The heat treatment may be performed at a temperature of 100 ° C to 1200 ° C and a heat treatment at 250 ° C to 1000 ° C More preferable. Most preferred is heat treatment at 800 占 폚 for 10 minutes to 30 minutes.

The binder 420 may be at least one selected from the group consisting of a phenol resin, a urea resin, a melamine resin, a Teflon, a polyamide, a polyvinyl chloride, a flame retardant polyethylene, a flame retardant polypropylene, a flame retardant polystyrene, a polyphenyline sulfide, , At least one of epoxy resin, chlorinated polyethylene, ethylene propylene dimethyl, acrylic resin, amide resin, polyester resin, polyethylene resin, ethylene-propylene rubber, polyvinyl butyral resin, polyurethane resin and nitrile- It would be desirable to include one or more.

Most preferably, EPDM (Ethylene Prophlene Diene Monomer) is used as the binder 420, but the present invention is not limited thereto.

The metal powder 410 and the binder 420 may be mixed and dispersed to prepare a green sheet 100 so that the metal powder 410 and the binder 420 have a solid content ratio of 75:25 to 95 : 5. ≪ / RTI >

Most preferably, the metal powder 410 and the binder 420 are mixed at a solid weight ratio of 83:17, but are not limited thereto.

The thickness of the green sheet 100 may be in the range of 5 to 200 占 퐉 in the step of mixing and dispersing the metal powder 410 and the binder 420 to produce a green sheet 100, Lt; / RTI >

Most preferably, the thickness of the green sheet 100 is not limited to 100 탆.

In the step of mixing and dispersing the metal powder 410 and the binder 420 to prepare a green sheet 100, at least one of the liquid powder mixing method and the dry kneading method may be used to mix the metal powder It is possible to disperse the binder 410 and the binder 420, but the present invention is not limited thereto.

(N + 1) release films (release films) are formed on the aluminum plate 300 so that the green sheet 100 is present between the two release films 200. [ The green sheet 200 is alternately laminated with the n green sheets 100 and the aluminum plate 300 is laminated on the uppermost release film 200 to form a green sheet Sheet unit 1000, it is possible that the n is 2 to 30.

Preferably, n is 5 to 7 and most preferably 6.

In the step of laminating the above green sheet unit 1000, m may be 10 to 50, preferably m is 20 to 30 and most preferably 25.

In the step of compressing and bonding the plurality of stacked green sheet units 1000 by applying pressure with a press, the air permeability of the green sheet unit 1000, which is received on the press and the press plate, It is possible to laminate Kraft paper on the release film 200. [

It is preferable that 10 to 20 sheets of the Kraft paper are laminated, which has the effect of uniformly dispersing heat during the thermocompression bonding process and can exhibit an effect as a buffer.

It is also possible to improve the heat dispersion and buffering effect by laminating a Sus plate before laminating the kraft paper.

In the step of pressing and pressing the plurality of stacked green sheet units 1000 under pressure with a press, it is possible to thermocompression at 70 ° C to 200 ° C for 60 minutes to 180 minutes will be.

Most preferably, the heat treatment is performed at a temperature of about 150 캜 for 120 minutes.

In addition, it is preferable that the pressure in a step of applying pressure and thermocompression to a plurality of stacked green sheet units 1000 by press is preferably thermocompression at a pressure of 2 MPa to 30 MPa , But is not limited thereto.

After the thermocompression process, the thermo-compressed green sheet unit 1000 is cooled in a state where the pressure of the press is maintained, and then the cooled green sheet unit The step of removing the press pressure from the step (1000) is performed by removing the pressure immediately at a high temperature except for the cooling step. Even if the green sheet is a crosslinked green sheet, In order to prevent it from falling again.

The composite magnetic sheet 400 produced by the present invention can have a density of 2 g / cm 3 to 5 g / cm 3, and it is possible that the magnetic permeability thereof is 30 μ to 250 μ.

More preferably, the composite magnetic sheet 400 has a density of 3.5 g / cm3 to 4 g / cm3 and a permeability of 30 mu m to 40 mu.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it should be understood that various changes and modifications will be apparent to those skilled in the art. It is to be understood that the present invention is not limited to the above-described embodiments. Accordingly, the scope of protection of the present invention should be construed according to the following claims, and all technical ideas which fall within the scope of equivalence by alteration, substitution, substitution, Range. In addition, it should be clarified that some configurations of the drawings are intended to explain the configuration more clearly and are provided in an exaggerated or reduced size than the actual configuration.

100: Green sheet 200: Release film
300: aluminum plate 400: composite magnetic sheet
410: metal powder 420: binder
500: Gas discharge path 1000: Green sheet Unit:

Claims (15)

In the composite magnetic sheet manufacturing method,
(i) preparing a metal powder, a binder, a plurality of air release films, and a plurality of aluminum plates;
(ii) mixing and dispersing the metal powder and the binder to prepare a green sheet;
(iii) On the upper side of the aluminum plate
And the green sheet is present between the two release films.
n + 1 pieces of the breathable release film and n pieces of green sheets are alternately laminated,
The aluminum plate is laminated again on the uppermost air permeable release film,
Forming a green sheet unit;
(iv) laminating the above green sheet units;
(v) thermocompression bonding the plurality of stacked green sheet units under pressure with a press;
(vi) cooling the thermo-pressed green sheet unit while maintaining the pressure of the press;
(vii) removing press pressure from the cooled green sheet unit,
The step (v)
The generated gas and the residual solvent are discharged in the plane direction through the release film,
It is a thermo-compression step consisting of one pressing without pressing process
Wherein the composite magnetic sheet is produced by a method comprising the steps of: The method according to claim 1,
In the step (i)
The breathable release film is manufactured by coating a film made by adding silica to polyethylene terephthalate (PET)
And the gas (gas) generated in the thermocompression bonding process and unevenness is formed so that the residual solvent is discharged in the surface direction
Wherein the composite magnetic sheet is produced by a method comprising the steps of: The method according to claim 1,
The aluminum plate is a physical barrier having a production control function in units of the green sheet unit
Wherein the composite magnetic sheet is produced by a method comprising the steps of: The method according to claim 1,
In the step (i)
The metal powder includes at least one or more of iron (Fe), silicon (Si), aluminum (Al), chromium (Cr), nickel (Ni)
Wherein the composite magnetic sheet is produced by a method comprising the steps of: The method according to claim 1,
In the step (i)
The binder may be selected from the group consisting of phenol resin, urea resin, melamine resin, Teflon, polyamide, polyvinyl chloride, flame retardant polyethylene, flame retardant polypropylene, flame retardant polystyrene, polyphenyline sulfide, flame retardant PET, flame retardant polytetrafluoroethylene, , At least one of chlorinated polyethylene, ethylene propylene dimethyl, acrylic resin, amide resin, polyester resin, polyethylene resin, ethylene-propylene rubber, polyvinyl butyral resin, polyurethane resin and nitrile-butadiene rubber Wherein the composite magnetic sheet is produced by a method comprising the steps of: The method according to claim 1,
In the step (ii)
Mixing the metal powder and the binder at a solid weight ratio of 75:25 to 95: 5
Wherein the composite magnetic sheet is produced by a method comprising the steps of: The method according to claim 1,
In the step (ii)
The thickness of the green sheet is in the range of 5 탆 to 200 탆
Wherein the composite magnetic sheet is produced by a method comprising the steps of: The method according to claim 1,
In the step (ii)
The metal powder may be dispersed in a binder by using at least one of a liquid-phase mixing method and a dry-kneading method
Wherein the composite magnetic sheet is produced by a method comprising the steps of: The method according to claim 1,
In the step (iii)
Wherein n is from 2 to 30
Wherein the composite magnetic sheet is produced by a method comprising the steps of: The method according to claim 1,
In the step (iv)
M is from 10 to 50
Wherein the composite magnetic sheet is produced by a method comprising the steps of: The method according to claim 1,
Prior to step (v)
Kraft paper is laminated on the breathable release film that is received on the press and the press plate
Wherein the composite magnetic sheet is produced by a method comprising the steps of: The method according to claim 1,
In the step (v)
At 70 DEG C to 200 DEG C,
Thermocompression for 60 to 180 minutes
Wherein the composite magnetic sheet is produced by a method comprising the steps of: The method according to claim 1,
In the step (v)
Thermocompression bonding at a pressure of 2 MPa to 30 MPa
Wherein the composite magnetic sheet is produced by a method comprising the steps of: In the composite magnetic sheet,
A process for the preparation of a compound according to any one of claims 1 to 13
The composite magnetic sheet having a density of 2 g / cm 3 to 5 g / cm 3
Wherein the composite magnetic sheet is a composite magnetic sheet. In the composite magnetic sheet,
A process for the preparation of a compound according to any one of claims 1 to 13
Wherein the composite magnetic sheet has a permeability of 30 占 퐉 to 250 占
Wherein the composite magnetic sheet is a composite magnetic sheet.

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