KR101476690B1 - Soft magnetic fiber and Processed article of soft magnetic material for the shield of electromagnetic pulse or wave, appratus and method for producing the same - Google Patents

Abstract

The present invention relates to an amorphous or nano-crystalline soft magnetic fiber, an apparatus and a method for manufacturing the soft magnetic fiber, and an application thereof. More particularly, the present invention relates to a soft magnetic fiber having a width (x) and a thickness (X / y) of the width (x) to the thickness (y) of the soft magnetic fiber structure having a cross section and a length (z) extending from the cross section, .

Description

TECHNICAL FIELD The present invention relates to a soft magnetic fiber, a manufacturing method thereof, and a soft magnetic material including the soft magnetic fiber,

The present invention relates to amorphous or nano-crystalline soft magnetic fibers and to an apparatus and a method for manufacturing the same and an application application.

BACKGROUND ART In recent years, high-speed processing of electronic devices has been accelerated, and the operating frequency of ICs and LSIs such as microprocessors is rapidly increasing. This increased frequency is likely to cause unwanted noise to be emitted from such a device.

Also, in the field of communication, next generation multimedia mobile communication (2 GHz), wireless LAN (2 to 30 GHz), and high speed communication network using optical fiber are currently in use. In the field of ITS (Intelligent Transport System), in the 5.8 GHz, AHS (an advanced cruise-assist highway system) in an automated electronic toll collection (ETC) system Of 76 GHz are used. Therefore, the high frequency use range is expected to continue to expand rapidly.

In particular, recent emergence of wearable computers and IT devices that can be worn like glasses or watches can not help us to seriously consider the adverse effects of electromagnetic waves from these devices on the body in the future. . Electromagnetic waves from existing fixed or mobile electronic devices have not caused serious damage to the body up to now, because of their sharp decrease in intensity according to the distance. However, in the case of a body-contact type electronic device, Therefore, it is necessary to develop electromagnetic interference shielding.

The rapid increase in the use of hybrid cars and electric vehicles, the use of electric motors and electronic components in automobiles not only suggests that the possibility of electromagnetic wave exposure of drivers and passengers is high, but also the intensity of electromagnetic waves and body exposure time . ≪ / RTI >

In addition, electromagnetic pulses (EMP) are induced by gamma rays during a nuclear explosion, which can cause severe damage to electronic devices, communications, and power networks. These electromagnetic waves are an indispensable element in everyday life, but they can be a byproduct of industrial facilities such as high-voltage lines and EMP weapons, and they are also used as a means of warfare to cause enormous damage to mankind.

When the frequency of the radio wave rises, noise is formed and becomes easier to radiate. At the same time, there is a problem of malfunction due to EMI (Electro-Magnetic Interference) due to noise margin caused by lowering the power consumption of electronic devices in recent years, deterioration of the noise environment inside the device due to miniaturization and high density of electronic devices .

Under such circumstances, countermeasures have been taken such as disposing a radio wave absorbing material in the inside of the electronic apparatus in order to reduce the EMI inside the electronic apparatus. One of the electromagnetic wave absorbing materials used so far is a composite sheet made of an electrically insulating organic material such as rubber or resin and a magnetic loss material such as a soft magnetic metal oxide material having a spinel crystal structure or a soft magnetic metal material.

A soft magnetic material means a magnetic material which is strongly magnetized even when a slight external magnetic field is applied and has a small residual magnetization.

With respect to the soft magnetic metal material, the limit frequency that can be used as the electromagnetic wave absorbing material can be increased to about 10 GHz by the eddy current suppressing effect and the shape magnetic anisotropy by making the particle thickness thinner than the skin depth.

In addition, although an electromagnetic wave absorbing material composed of a particulate magnetic metal and a ceramic has been developed in the past, it has not been satisfactory in terms of electromagnetic wave absorption performance, and development of an electromagnetic wave absorbing material excellent in performance that can be used up to a millimeter wave region has been continuously required. Furthermore, there is a need for a structure that can be easily applied to various objects as well as its performance so that it can be applied to various electromagnetic wave absorbing workpieces using a soft magnetic material.

Disclosure of the Invention The present invention has been conceived to solve the above-mentioned problems, and an object of the present invention is to provide a soft magnetic fiber having a fine fiber structure to provide a soft magnetic fiber having excellent soft magnetic characteristics, There is.

As a means for solving the above problems, the present invention provides a method for producing a soft magnetic fiber having a fine fiber structure, comprising the steps of melting a soft magnetic material body through a supply unit having a heat source and discharging the molten soft magnetic material body through at least two The soft magnetic material melt ejected from the ejection unit is brought into contact with the outer surface of the drum of the rotary drum unit to be cooled and solidified to produce soft magnetic fibers.

According to the present invention, in manufacturing amorphous or nanocrystalline soft magnetic material fibers, it is possible to realize a fiber-like structure having a structure that melts a soft magnetic material material of a metal or an alloy material and maximizes a magnetic permeability thereof, The present invention can be applied to various applications such as a wool structure and an acicular type powder structure by using a magnetic fiber type structure and can be applied universally for electromagnetic wave shielding applications.

1 is a conceptual diagram showing the structure of a soft magnetic fiber according to the present invention.
FIGS. 2 and 3 are tables showing experimental results on characteristics of the soft magnetic fibers according to the present invention, respectively.
4 is a conceptual diagram showing an apparatus for producing soft magnetic fibers according to the present invention.
5 is a conceptual diagram showing the configuration of the injection unit of the manufacturing apparatus of Fig.
6 and 7 are conceptual diagrams showing problems in the production of the soft magnetic fibers according to the present invention.

Hereinafter, the configuration and operation according to the present invention will be described in detail with reference to the accompanying drawings. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following description of the present invention with reference to the accompanying drawings, the same components will be denoted by the same reference numerals regardless of the reference numerals, and redundant description thereof will be omitted. The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

FIG. 1 is a conceptual diagram showing the structure of the soft magnetic fibers according to the present invention, and FIGS. 2 and 3 are experimental result tables for explaining the characteristics of the soft magnetic fibers according to the present invention.

1, a soft magnetic fiber according to the present invention comprises a cross section having a width (x) and a thickness (y) and a cross section having a length (z) extending in the cross section, (X / y) of the width (x) to the thickness (y) satisfies 10 to 125. [ In particular, the cross-section of the soft magnetic fiber in the present invention is described as a preferred embodiment having a rectangular cross-section as shown in FIG. 1, but the present invention is not limited thereto. The cross section may be elliptical, circular or polygonal, And a single closed curve of < RTI ID = 0.0 > In this case, the width (x) is defined as the longest horizontal line in the horizontal direction forming the longest length in the cross section, and the thickness (y) is defined as the longest vertical line perpendicular to the width (x). In addition, the soft magnetic fibers of the present invention can be defined as a fibrous structure having a certain length z extending in the longitudinal direction in the cross section.

In particular, the soft magnetic fiber according to the present invention is characterized in that the ratio (z / x) of the width (x) or the thickness (y) of the cross section to the length (z) z / y) is 100 or more. In this case, it is preferable that the width (x) of the soft magnetic fibers is not less than 500 탆 and not more than 2500 탆, and the thickness (y) is not less than 20 탆 and not more than 50 탆. In this case, . Of course, when the soft magnetic fibers having the above-described structure are crushed to form acicular soft magnetic powder according to the processing state, the length z is 5,000 占 퐉 or less, and the width (x) and the length z It is preferable that the ratio (z / x) is formed so as to satisfy 2 or more and 10 or less.

2 is an experimental result table for explaining the characteristics of the range of the thickness of the soft magnetic fiber according to the present invention. FIG. 2 shows the effect of thickness on the soft magnetic properties of a typical amorphous soft magnetic material METGLAS (Fe78Si9B13) and an amorphous FeSiBP composition having an average width of 1000 mu m +/- 20 mu m according to the present invention, .

The results of the experiment shown in FIG. 2 are obtained by measuring the characteristics of the sample after the samples were prepared with the melt spinner (soft magnetic fiber production apparatus) of FIG. 4 and then subjected to the optimal heat treatment. In this case, the result of not performing the optimal heat treatment is important because when the amorphous soft magnetic material is subjected to the optimal heat treatment, the brittleness is increased, and the mechanical properties are lowered and the material is easily broken. Therefore, when the material is used as an electromagnetic wave absorber, This is because it is important to explore materials with excellent soft magnetic properties even without optimal heat treatment. In addition, even after the optimal heat treatment, the soft magnetic characteristics may be deteriorated due to stress acting during the process of forming the final state or during use. Therefore, in order to produce a product having excellent soft magnetic characteristics It is necessary to find a standard condition having excellent characteristics before the optimal heat treatment.

Referring to the results shown in FIG. 2, in the case of METGLAS having excellent soft magnetic characteristics, relatively soft magnetic characteristics were shown at 20 to 30 μm and a coercive force of 9 to 17 A / m, 40 A / m, and the coercive force abruptly increased in a sample having a thickness exceeding 50 탆, resulting in loss of soft magnetic properties. In addition, the coercive force of FeSiBP, which is superior to METGLAS for amorphous formation, was found to be very low, about 5 to 14 A / m in the thickness range of 20 to 50 μm, while the coercive force was relatively increased in the other thickness range.

As a result of analysis of the above results, the amorphous soft magnetic fibers showed the best soft magnetic characteristics in the range of 20 μm to 30 μm, and when the amorphous forming ability was excellent, the soft magnetic properties were improved as the thickness increased, , This phenomenon is caused by the single roll melt spinning method.

That is, the stress generated due to the difference in cooling rate between the side contacting the cooling roll and the side opposite to the side contacting the cooling roll (atmospheric contact) in the manufacturing apparatus shown in FIG. 4 becomes larger as the thickness becomes thicker, On the other hand, the reason why the coercive force is increased as the thickness becomes thinner regardless of the amorphous forming ability is that the ratio of the area where the stress which is formed on the opposite side of the surface contacting with the cooling roll, As a result of having an adverse effect on the overall soft magnetic properties. (Referring to the conceptual view of FIG. 6, the cross-section of the soft magnetic fiber 1 according to the present invention shows that the upper surface of the fiber is in contact with air to produce an oxide film (a) If the thickness of the soft magnetic fiber is less than 20 mu m, the influence of the surface in contact with the air or in contact with the cooling roll becomes very large. The influence of the surface contacting with the air or the surface contacting with the cooling roll is not great but the stress is generated due to the difference of the cooling rate and the crystallization occurs from the direction of the air contact surface. This results in whiskers (c) adversely affecting the soft magnetic properties of the soft magnetic fibers, as shown in Fig. 7).

As a result, the amorphous soft magnetic fiber has an optimum soft magnetic property (low coercive force and low coercive force) regardless of the amorphous forming ability. As a result, the magnetic permeability of the amorphous soft magnetic fiber can be determined by the above- The magnetic permeability and the soft magnetic properties of the soft magnetic fiber are greatly reduced in the range of the thickness of the soft magnetic fiber according to the present invention. It is preferable to satisfy the range of 20 탆 to 50 탆.

In addition, it is preferable that the width (x) of the soft magnetic fiber according to the present invention satisfies a range of 500 μm or more and 2500 μm or less. Referring to FIG. 3, the width of the soft magnetic fiber according to the present invention is considered in consideration of the characteristics of the melt spinner equipment directly related to the manufacture of the product, cost-effectiveness (economical efficiency), material composition and physicochemical characteristics .

That is, when the width (x) of the soft magnetic fiber according to the present invention is in the range of 500 μm to 2,500 μm, it is possible to produce a product having excellent soft magnetic properties as well as excellent economy compared with products having a size less than 500 μm or exceeding 2500 μm . For example, in order to produce a product having a width of less than 500 μm, the size of the nozzle must be 0.2 mm to 0.3 mm or less. The reason why the nozzle diameter is smaller than the product width is that the smaller the diameter of the nozzle, 4, the resistance of the soft melt supplied from the supply unit to the nozzle must be increased to increase the injection pressure, thereby increasing the pressure of the molten metal (the pressure applied to the cooling roll is increased and the molten metal spreads to the periphery of the nozzle, When manufacturing an amorphous soft magnetic product having a width of 500 μm or less with a melt spinner apparatus, the diameter of the nozzle is extremely small, so that a high-pressure injection gas is required, and a nozzle and a crucible There is a risk that the equipment is destroyed or an excessive amount of gas is consumed.

In the production of a product requiring mass production such as an electromagnetic wave absorber, production of a product having a width of less than 500 μm is not realistic due to the above reasons, and whisker-like defects, which are naturally formed on both sides of the product in terms of soft magnetic properties, As the degree of influence on the increase of the width increases, the decrease of the width is directly proportional to the deterioration of the soft magnetic characteristics. On the other hand, when the width of the product is 500 mu m or more, the influence of such whiskers on the overall soft magnetic properties is negligibly small. The experimental results are the same as those shown in Fig.

The reason why the maximum width of the soft magnetic fibers according to the present invention is limited to 2500 占 퐉 is due to the soft magnetic properties and the manufacturing conditions. First, in order to maximize the magnetic permeability in the longitudinal direction by optimizing the shape magnetic anisotropy, the soft magnetic fiber to be proposed in the present invention is different from the ribbon or the strip in that the cross-sectional direction (x, y) perpendicular to the longitudinal direction z It is necessary to maximize the ratio in the longitudinal direction. In order to do this, it is necessary to minimize the thickness and the width. The thickness is limited to 20 탆 to 50 탆, which is optimized in the above description. Also, the minimum value of the width was set to 500 탆 or more in consideration of the improvement of soft magnetic characteristics and the economical efficiency of manufacturing.

The increase in the width of the amorphous soft magnetic material using the melt spinner is one of the most important tasks in terms of economy and usability. However, since the present invention aims to diversify the application field using the fiber form, production of a product having a large width is not directly connected to useful results. However, if the width is too small, the manufacturing cost will increase, and if the coating area is required in the application step, the cost may be increased by increasing the work requirement, It is necessary to set the width. When the amorphous soft magnetic material is manufactured by using the melt spinner, the shape of the nozzle is usually circular or slit shape. The slit shape is used for manufacturing a wide material and requires an expensive process such as laser processing. There is a disadvantage that the unit price increases dramatically. On the other hand, the circular nozzle shape is simpler to manufacture than the slit shape, and thus the production cost is low, but there is a limit in producing a wide product. The limit value is about 2,000 to 3,000 mu m. However, in a mass production system, since the amount of molten metal melted into a crucible may reach several hundred kg, excessive pressure is applied to the nozzle by its own weight, and the molten metal falls freely even if it does not exert any additional injection pressure.

The maximum nozzle diameter that can utilize this phenomenon may eventually be related to the maximum width of the soft magnetic material. This is because the minimum value of the width of 500 mu m as proposed in the present invention belongs to a region capable of jetting even with the pressure of the weight of the molten metal at the nozzle diameter of 0.5 mm. If the diameter of the nozzle is larger than 0.5 mm, it is possible to manufacture the product by free fall. The problem is that if the diameter of the nozzle is too large, the injection amount of the molten metal becomes excessive, and the thickness of the product becomes thick, It is impossible to produce a product with a thickness of 50 탆 or it is not solidified by a cooling roll and is hit with a cooling roll in a state of a high-temperature molten steel, and is then likely to radiate and generate a fire.

Considering the viscosity of the molten amorphous soft magnetic material whose main raw material is iron, cobalt and nickel, the maximum diameter of the nozzle, from which the molten metal may not be excessively sprayed, is about 2.0 mm, The maximum width is 2,500 mu m. Therefore, in the present invention, the range of the soft magnetic fiber width is limited to 500 mu m to 2,500 mu m. In addition, in a fiber-based application, a maximum width of about 2500 μm also affects the manufacture of soft magnetic wool and needle-like powder using fibers. In the case of manufacturing a three-dimensional electromagnetic wave shielding material as soft magnetic wool or needle- It is necessary to minimize the cross-sectional area of the fibers in order to exhibit the same shielding effect by using the magnetic wool or acicular powder in a minimum amount per unit volume. In this case, it is possible to minimize the width in order to obtain the minimum cross-sectional area in the state where the thickness is already determined. In order to prevent the sagging due to the mixed resin or filler when the electromagnetic wave shielding composite is manufactured, Of the width. Considering this point, the maximum width that can be produced in the form of soft magnetic fibers is 2500 μm.

That is, if the thickness of the soft magnetic fiber made of the single roll melt spinner is in the range of 1 탆 to 20 탆, the soft magnetic material is too thin, so that the influence of the surface oxide film on the entire material becomes large, , The provision of sufficient thickness for the skin effect in the low frequency band is limited, and when mixed with other resins or composite materials, the mechanical strength required for soft magnetic fibers can not be satisfied. For example, in order to prevent the phenomenon that the soft magnetic wool is pulled to one side when the soft magnetic wool to be described later is entangled and the soft wool wool is mixed with the filler (resin), the mechanical strength is essential.

4 is a conceptual diagram showing the structure of a manufacturing apparatus (so-called 'melt spinner') for manufacturing the soft magnetic fiber according to the present invention.

4, the manufacturing apparatus according to the present invention includes a supply unit 110 for forming and supplying a soft magnetic material melt, a spray unit 120 formed at a lower end of the supply unit and having at least two or more discharge ports, And a rotary drum unit for cooling and solidifying the soft magnetic material melt discharged from the injection unit by contacting the outer surface of the cooling roll 200. [ The soft magnetic fibers to be applied to the experiments of FIGS. 2 and 3 described above are manufactured through the present manufacturing apparatus (so-called melt spinner). The manufacturing apparatus according to the present invention has a soft magnetic fiber structure having a cross section having a width (x) and a thickness (y) and a length (z) extending in the cross section as described above, (X) is not less than 500 占 퐉 and not more than 2,500 占 퐉, and the thickness (y) is not less than 20 占 퐉 or more It is possible to efficiently produce soft magnetic fibers having a size of 50 μm or less.

The supply unit 110 includes a melting crucible of a general melt spinner apparatus and a heat source 130. The supply unit 110 will not be described in further detail. In particular, in the present invention, And an injection unit 120 that performs a function of the injection unit 120.

Preferably, the ejection unit 120 has at least two ejection openings, and the ejection opening has a diameter of 0.3 mm or more and 2.0 mm or less. When the diameter of the discharge port is less than 0.3 mm, the diameter of the melt, which is the melt of the soft magnetic material, can not easily escape. Therefore, high-pressure injection gas must be applied to the upper portion of the melt, There is a fatal problem that the molten metal and the nozzle are cooled by the gas flow and the nozzle is clogged. Furthermore, since the size of the discharge port is too small, there is a high possibility that the diameter of the nozzle is deformed or destroyed in the process of spraying at a high pressure.

In order to solve this problem, in the present invention, the diameter of the discharge port can be set to 0.3 mm or more and 2.0 mm or less. Further, in order to reduce the manufacturing cost of the product, a low pressure atmosphere is not separately formed, The width and thickness of the soft magnetic fiber can be adjusted by controlling the amount of molten metal ejected from the nozzle by adjusting the pressure of the container holding the molten metal so that the diameter of the nozzle can be increased and the free fall can be made by the weight of the molten metal. . Since it can be manufactured in the air, equipment such as a vacuum chamber or a vacuum pump is not required, and gas cost can be reduced because no gas is filled in the vacuum chamber. However, some compositions may require fabrication in a vacuum or inert gas atmosphere.

Since the amount of the molten metal sprayed per hour is small in the manufacturing method of the soft magnetic fiber according to the present invention, the cooling effect by the airflow along the cooling roll is greater than the heat transferred from the molten metal to the nozzle, The possibility of clogging of the molten metal in the inside becomes very high. Therefore, in order to prevent this, in particular, in the manufacturing apparatus according to the present invention, the nozzle opening of the injection unit 120 disposed close to the cooling roll by the air flow around the cooling roll 200 is cooled The heating unit 140 may be formed by installing an RF induction coil / heating wire. In addition, the heating unit 140 may be implemented by installing an RF induction coil / heating wire, and further, It is more preferable to install the cooling unit 160 on the outside of the cooling roll.

In addition, as the RF Induction coil / hot wire for nozzle heating approaches the cooling roll, a cooling roll induction shielding film 150 can be additionally provided between the nozzle and the cooling roll so that the cooling roll is not heated by the induction coil.

In order to optimize the soft magnetic fiber, it is important to control the temperature of the injection nozzle. Especially, in manufacturing the soft magnetic fiber, it takes a long time to complete the injection because the injection amount per unit time is small. Temperature control of the nozzle is the most important factor. Therefore, it is preferable to additionally provide a thermometer and a heating device in the injection nozzle. To this end, in order to adjust the optimum temperature of the molten metal in real time, the temperature measuring unit 141 may be further provided near the outlet of the injection nozzle. The temperature measuring unit 141 may be implemented by various methods such as a method of attaching and sensing a temperature sensor, or a method of directly placing a thermometer.

FIG. 5 shows the structure of the injection unit 120 shown in FIG. 4. FIG. 5 shows a structure of a nozzle unit 120 having a structure that a width becomes narrower toward the bottom, and a plurality of discharge ports 121 and 122 have. In this case, the discharge port may be arranged so as not to form a straight line with the center of the adjacent discharge port. That is, although the discharge ports 121 may be arranged in a row, a plurality of discharge ports may be arranged in a row, but it is more preferable that the discharge amount is formed in a zigzag form in two rows so as to maximize the injection amount per unit time and maintain the mechanical strength of the nozzle .

4, the soft magnetic material material is melted through the supply unit including the heat source, and the molten soft magnetic material melt is sprayed through the spray unit having at least two discharge ports , The soft magnetic material melt injected from the injection unit is brought into contact with the outer surface of the cooling roll of the rotary drum unit to cool and solidify the soft magnetic material. In this manufacturing process, the injection unit is heated to prevent the entrance of the narrow injection nozzle from being clogged by the melt (molten metal), and the cooling roll shielding film which prevents heat from being applied to the cooling roll by heating, The air flow blocking film for preventing the injection nozzle from being clogged by the air flow blocking film is provided so that an efficient manufacturing process can be realized.

The soft magnetic material which is a raw material for producing the soft magnetic fiber according to the present invention is selected from the group consisting of ferrite, Permalloy, Supermalloy, Isoperm, Finemet and sendust Or a mixture of two or more of them may be used.

In this case, the permalloy and the supermalloy may be Fe-Ni, Fe-Si-B, Fe-Si-B-Cu-Nb, Fe-Zr- . In addition, Fe (Co, Ni) -Si-B, Fe (Co, Ni) -BC, Fe (Co, Ni) BP, Fe (Co, Ni) -B-Cr, Fe (Co, Ni) -Si-B- Fe-Al-Ga-PCB, Fe-Al-Ga-PCB-Nb, Fe-Zr- Fe-Al-Ga-PCB-Co, Fe-Al-Ga-PCB-Si, Fe-Co-Ni-Zr-B, Fe-Co-Ni-Zr-B, Fe-Co- -Zr-Mo-WB, and Fe-Si-BP-Cu.

In the manufacturing apparatus shown in FIG. 4 according to the present invention, one rotary cooling roll is used as an example. However, in the melt spinning apparatus, a single roll type single rotary drum or twin rotary drum roll) type.

In the production of soft magnetic filament fibers according to the present invention, it is preferable to use spinning by spinning of the soft magnetic material melt or spinning by natural fall of the soft magnetic material melt.

Unlike the conventional production of a soft magnetic material strip of a wide width or manufacturing of a fiber through fine grooves along a roll, a plurality of discharge ports are formed in the nozzle while smoothly maintaining the roll (drum) surface and the spinning speed of the melt is set at a free fall level And a relatively small amount of molten metal is allowed to be radiated so that a very thin fiber can be produced.

Hereinafter, application products of various soft magnetic materials including the soft magnetic fibers according to the present invention will be described.

Electromagnetic wave shields suitable for applying the soft magnetic material workpiece of the present invention include tiles, paints, spray solutions, wallpaper, adhesives, protective facilities, walls, heat insulation materials, doorways, vents, vents, bedding, cloths, . For military use, it can be applied to aircraft housing, aircraft propeller, etc. which require stealth function, and it is applicable to walls, windows, entrances and ventilations of protection facilities.

For example, the soft magnetic material fibers according to the present invention are suitable for application to electromagnetic wave shields (e.g., bedding, cloths, clothing, communication cables, power cables, etc.) by woven or nonwoven fabrics alone or with other materials, Is suitable for application to electromagnetic wave shields (eg, protective facilities, doors, entrances, vents, etc.), and soft magnetic whiskers and acicular powders are suitable for electromagnetic wave shielding (eg, (Eg, tiles, walls, and insulation) that can be molded into a product after mixing with a substrate. Specific application products are as follows.

(1) soft magnetic body workpiece of three-dimensional structure

As an application example of the soft magnetic fiber according to the present invention, it can be implemented as a soft magnetic material workpiece for electromagnetic wave shielding, which is a structure including the soft magnetic fiber and the resin type filling material filled in a three-dimensional housing with an inner space. In the manufacturing method, the soft magnetic wool, which is a structure in which the soft magnetic fibers according to the present invention are embedded, is uniformly filled in the three-dimensional structure, and then the filling space such as resin is filled in the hollow space to form a three- .

(2) Shielding workpiece of planar structure

Furthermore, at least one of the soft magnetic wool according to the present invention as a planar structure shielding material or the soft magnetic powder having an acicular structure formed by grinding the soft magnetic fibers is pressurized and deformed into a wide flat structure, It is also possible to manufacture a shield.

(3) Laminated type shielding workpiece

A structure in which soft magnetic fibers or soft magnetic wool structures according to the present invention are applied to form a mesh structure (net or mesh structure), and then laminated on one side or both sides of the mesh structure using glass, paper, And can be applied as a workpiece for realizing an electromagnetic wave shielding body.

(4) Flexible soft magnetic sheet workpiece

When the soft magnetic fiber according to the present invention is mixed with a general fibrous material to prepare a sheet or cloth type workpiece, it is also possible to realize a flexible shield having flexibility.

(5) Architectural Structural Shielding Workpiece

The soft magnetic fiber, the soft magnetic wool, or the acicular soft magnetic powder structure according to the present invention can be mixed with cement, concrete or the like to realize electromagnetic wave shielding as a building material and a structure for enhancing mechanical strength.

(6) Cable type shielding workpiece

It is also possible to wind the soft magnetic fiber, the soft magnetic wool, or the acicular soft magnetic powder structure according to the present invention in a filament winding manner on the outside of a power cable, a communication cable, a high voltage transmission line, etc., It is possible.

(7) Painted Shielding Workpiece

The soft magnetic fiber, the soft magnetic wool or the acicular soft magnetic powder structure according to the present invention may be mixed with paint, resin, enamel or the like and spray coated on the surface of a wall or a three-dimensional structure by spraying or the like to form a shielding film It is also possible to implement a paint-type shielding workpiece.

(8) Insulation type shielding workpiece

It is also possible to realize a workpiece having a function capable of simultaneously exhibiting electromagnetic wave shielding and heat insulation by mixing the soft magnetic fiber, soft magnetic wool or acicular soft magnetic powder structure according to the present invention with styrofoam, gypsum and the like.

(9) Ventilated Shielding Workpiece

The soft magnetic fiber, the soft magnetic wool or the acicular soft magnetic powder structure according to the present invention may be manufactured in the form of net (mesh) and fixed to one side and / or both sides of the soft magnetic material frame of a ventilating structure, When combined, it is also possible to implement a shielded workpiece of a ventilated structure.

As described above, the embodiments of the present invention have been described in detail with reference to the drawings. However, various modifications are possible within the scope of the present invention. The technical idea of the present invention should not be limited to the embodiments of the present invention but should be determined by the equivalents of the claims and the claims.

1: soft magnetic fiber
110: supply unit
120: injection unit
130: Heat source
140: Heating unit for nozzle heating
150: cooling roll induction shielding film
160: air flow blocking film
200: cooling roll

Claims (23)

A cross section having a width (x) of 500 mu m or more and 2,500 mu m or less and a thickness (y) of 20 mu m or more and 50 mu m or less,
A soft magnetic fiber structure having a length (z) extending in said cross-section,
Wherein the ratio (x / y) of the width (x) to the thickness (y) satisfies 10 or more and 125 or less.
(Where the width x is defined as the longest horizontal line in the horizontal direction of the cross section and the thickness y is defined as the longest vertical line in the direction orthogonal to the width)
The method according to claim 1,
The soft magnetic fibers may include,
The ratio (z / x) of the width (x) of the cross section or the thickness (y) of the cross section to the length (z) of the soft magnetic fibers satisfies a condition of 10 or more and (z / y) Soft magnetic fibers.
delete delete delete delete A supply unit for forming and supplying a soft magnetic material melt;
An ejection unit formed at a lower end of the supply unit and having at least two ejection openings, the ejection openings being arranged so as not to form a straight line with the center of the adjacent ejection openings;
A rotary drum unit for cooling and solidifying the soft magnetic material melt discharged from the injection unit by contacting the outer surface of the cooling roll;
/ RTI >
Wherein the injection unit and the rotary drum unit are disposed apart from each other,
The apparatus for manufacturing soft magnetic fibers according to claim 1, further comprising a cooling roll induction shielding film for blocking the movement of heat between the ejection unit and the rotary drum unit.
The method of claim 7,
Wherein the injection unit comprises:
Wherein the diameter of the discharge port is not less than 0.3 mm and not more than 2.0 mm.
delete The method of claim 7,
The manufacturing apparatus includes:
And a heating unit for applying heat to the ejection unit to remove clogging of the ejection port.
delete The method of claim 7,
The manufacturing apparatus includes:
And a temperature measuring unit for measuring a temperature of an end of the ejecting unit.
The method of claim 12,
The manufacturing apparatus includes:
And an air flow blocking film spaced apart from an outer surface of the rotary drum unit and formed below the cooling roll inductance shielding film to block air flow by the cooling roll of the rotary drum unit.
Melting the soft magnetic material through the supply unit including the heat source,
The molten soft magnetic material is sprayed through a spray unit having at least two or more discharge ports arranged in such a structure that the discharge port does not form a straight line with the center of the adjacent discharge port,
Wherein the soft magnetic material melt ejected from the ejection unit is brought into contact with an outer surface of a cooling roll of a rotary drum unit disposed apart from the ejection unit to cool and solidify to produce the soft magnetic fiber of claim 1.
A soft magnetic material workpiece for electromagnetic wave shielding comprising the soft magnetic fibers of claim 1 or claim 2.
16. The method of claim 15,
The soft magnetic material-
A soft magnetic material workpiece for shielding electromagnetic interference, the structure including the soft magnetic fiber and the resin type filling material filled in a three-dimensional housing having an inner space.
18. The method of claim 16,
The soft magnetic fibers may include,
A soft magnetic wool having a wool structure in which linear soft magnetic fibers are entangled, or a soft magnetic powder having an acicular structure formed by grinding the soft magnetic fibers, the soft magnetic material for shielding electromagnetic wave for electromagnetic wave shielding.
16. The method of claim 15,
The soft magnetic material-
A structure of a mesh structure formed by soft magnetic wool having a wool structure in which the soft magnetic fibers or the linear soft magnetic fibers are entangled;
And a cover member laminated on one side or both sides of the structure of the mesh structure.
16. The method of claim 15,
The soft magnetic material-
Wherein the soft magnetic material for shielding electromagnetic wave is a fabric structure formed by mixing the soft magnetic fibers and the fibers of the fibrous material.
16. The method of claim 15,
The soft magnetic material-
At least one of the soft magnetic wool having a wool structure in which the soft magnetic fibers and the linear soft magnetic fibers are entangled or the soft magnetic powder having an acicular structure formed by grinding the soft magnetic fibers,
Cement, concrete, styrofoam, gypsum, or the like, which is formed by mixing with a material containing at least one of cement, concrete, styrofoam, and gypsum.
16. The method of claim 15,
The soft magnetic material-
A liquid paint type shielding material in which an acicular powder of an acicular structure formed by pulverizing the soft magnetic fibers is mixed with a liquid resin; and a soft magnetic material for electromagnetic wave shielding.
16. The method of claim 15,
The soft magnetic material-
At least one of the soft magnetic wool having a wool structure in which the soft magnetic fibers and the linear soft magnetic fibers are entangled or the soft magnetic powder having an acicular structure formed by grinding the soft magnetic fibers,
A cable-type shielding workpiece which is wound and embossed on the outside of a cable, which is a soft magnetic body for shielding electromagnetic waves.
16. The method of claim 15,
The soft magnetic material-
A mesh type sheet structure formed by using any one of the soft magnetic fibers, the soft magnetic wool having a wool structure in which the linear soft magnetic fibers are intertwined, or the soft magnetic powder having an acicular structure formed by grinding the soft magnetic fibers;
Wherein the mesh-like sheet structure is fixed to a soft-magnetic frame having an open structure or coupled to the soft-magnetic frame in such a manner as to be filled therein.

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