WO2014123367A1 - Protective cover for portable terminal and method for manufacturing same - Google Patents

Abstract

A protective cover for a portable terminal, according to the present invention, can block electronic waves generated by the portable terminal and carries out an antibiotic function of removing various kinds of bacteria on the portable terminal by comprising: a cover layer; an adhesion layer stacked on the inner surface of the cover layer; and a metal layer attached to the adhesion layer so as to carry out an electronic wave shielding function. In addition, the present invention can carry out a DMB reception antenna function when the metal layer is formed in a DMB reception antenna pattern.

Description

Protective cover for mobile terminal and manufacturing method thereof

The present invention relates to a protective cover mounted on an outer surface of a portable terminal to protect the portable terminal from external impact or contact, and more particularly, to a protective cover for a portable terminal having an electromagnetic shielding, antibacterial or DMB receiving antenna function. .

In general, a portable terminal is a portable electronic device that is portable and has one or more functions such as voice and video calling, input and output of information, and a function of storing data.

Such portable terminals are being implemented in the form of a multimedia player having complex functions such as taking a picture or a video, playing a music or a video file, playing a game, or receiving a broadcast as the current functions are diversified. .

When the portable terminal has a digital multimedia broadcasting (DMB) reception function, an antenna for terrestrial DMB reception is provided. Here, in order for the antenna for terrestrial DMB reception to exhibit good reception performance, the antenna has to have a relatively large size in comparison with the size of the terminal, and thus has an external antenna structure detachable from the terminal or drawn out to the outside.

However, since the antenna for terrestrial DMB reception installed externally in the portable terminal must be drawn out when in use, it is inconvenient to use, and it is inconvenient to carry the terminal as it protrudes to a considerable size from the portable terminal. There is a high risk of breakage during use, there is a problem that must be handled with care at all times.

In addition, since the portable terminal is always carried by the user, electromagnetic waves generated from the portable terminal are transmitted to the human body as it is, causing a problem.

In addition, in the portable terminal, since the user operates the device by touching it using a finger or the like, various germs multiply on the surface of the portable terminal, causing a danger to health.

The conventional mobile terminal protective cover is manufactured by combining an opaque synthetic resin and a transparent synthetic resin having a fabric inner skin attached to the inner surface thereof, as disclosed in Korean Utility Model Publication No. 20-0377332 (February 21, 2005). A protective cover that covers the exterior of the mobile phone to protect the external surface of the mobile phone, wherein the protective cover is laminated with an electromagnetic shield having a conductive metal or conductive metal material between the opaque synthetic resin and the fabric inner surface of the opaque synthetic resin, and the outer surface of the opaque synthetic resin And a plurality of connecting plates having a connecting piece that is bent and gripped to pass through the opaque synthetic resin so as to be connected to the electromagnetic shielding body as a conductive metal plate and connected to the electromagnetic shielding body.

The conventional portable terminal has a problem that the process is complicated because the electromagnetic shielding body should be attached after laminating it between the synthetic resin and the fabric endothelium, thereby increasing the manufacturing cost.

In addition, the conventional mobile phone accessories with a built-in DMB antenna, as disclosed in Korean Patent Laid-Open Publication No. 10-2009-0002516 (January 09, 2009), the mobile phone accessory body and the nature of the electrical properties due to the molecular structural features A conductive fiber having a conductive polymer coated on the surface of the substrate fiber as a conductor, and a DM antenna for receiving a DM broadcast signal including audio and video signals, and a conductive fiber, and a DM signal of the mobile phone Consists of a transceiver that performs the function of connecting the transceiver and the DMB antenna to each other.

Such a conventional DMB antenna has a problem in that reception performance is lowered when using a conductive metal material because the conductive fiber coated with the conductive polymer on the surface of the substrate fiber is used in the accessory body.

In addition, in the process of weaving the conductive fiber into the antenna pattern, the conductive polymer coated on the substrate fiber may be peeled off, and when the conductive polymer material is peeled off, the conductive polymer may be disconnected and thus fail to function as an antenna.

SUMMARY OF THE INVENTION An object of the present invention is to provide a protective cover for a mobile terminal capable of shielding electromagnetic waves generated from the mobile terminal by providing a conductive metal layer on an inner surface of the cover layer.

Another object of the present invention is to provide a protective cover for a mobile terminal capable of providing antimicrobial function in addition to electromagnetic shielding by providing a silver or silver-bonded yarn on the inner surface of the cover layer.

Still another object of the present invention is to form a metal layer formed on the inner surface of the cover layer as an antenna pattern and use it for DMB reception, so that there is no need to install an external antenna in the portable terminal, which makes it convenient to use and can slim down the portable terminal. A protective cover for a mobile terminal is provided.

Still another object of the present invention is to manufacture a conductive twisted yarn using a metal yarn made of a conductive metal, thereby improving antenna performance and preventing the metal yarn from being deformed or broken, thereby preventing disconnection of the antenna pattern. It is to provide a protective cover for a portable terminal.

Still another object of the present invention is to form an Ag nanoweb layer by electrospinning a spinning solution containing Ag nanomaterials on the inner surface of the cover layer, thereby shielding electromagnetic waves generated from the mobile terminal, and also have an antibacterial function and improve blood circulation. The present invention provides a protective cover for a portable terminal and a method of manufacturing the same, which can smoothly improve the health by far-infrared radiation.

Still another object of the present invention is to provide a protective cover of a mobile terminal and a method of manufacturing the same, by adding a pigment to the spinning solution, thereby preventing the oxidation of Ag exposed to the outside and making the design beautiful.

Still another object of the present invention is to attach a conductive metal plate to the cover layer to shield electromagnetic waves, and to protect the mobile terminal to perform an antibacterial function by electrospinning a spinning solution containing Ag nanomaterials on the conductive metal plate to form an Ag nanoweb layer. It is to provide a cover and a method of manufacturing the same.

In order to achieve the above object, the protective cover for a mobile terminal of the present invention includes a cover layer, an adhesive layer laminated on the inner surface of the cover layer, and a metal layer attached to the adhesive layer to serve as an electromagnetic shielding function.

The metal layer of the present invention may be formed of a conductive metal thin film, or may be formed in the form of a wire, or may be arranged orthogonal to each other to form a mesh.

The metal layer of the present invention may be formed of a silver alloy containing pure silver (Ag) or silver (Ag) to have antibacterial performance.

The metal layer of the present invention is formed of a double metal yarn, wherein the double metal yarn has a center metal layer having a strength higher than silver (Ag) and an elongation equal to or higher than silver, and a silver (Ag) layer wrapped on an outer surface of the center metal layer. It may include.

The metal layer of the present invention is formed of a conductive twisted yarn, the conductive twisted yarn is a first fiber yarn formed of synthetic fibers or natural fibers, a metal yarn wound in a spiral form on the outer circumferential surface of the first fiber yarn and having an antimicrobial and conductivity, and It may include one or more strands of the second fiber yarn that is joined with the first fiber yarn wound more than the strand of metal yarn.

The protective cover for a mobile terminal of the present invention includes a cover layer made of a resin, an adhesive layer attached to an inner surface of the cover layer, a metal layer attached to the adhesive layer to provide electromagnetic shielding, and a fiber layer laminated on the metal layer to protect the metal layer. It includes.

The protective cover for a mobile terminal of the present invention may include a cover layer and an Ag nanoweb layer laminated on an inner surface of the cover layer and formed by electrospinning a spinning solution containing Ag nanomaterials.

The spinning solution of the present invention may be formed by mixing a Ag nanomaterial, an electrospinable polymer material and a solvent in a predetermined ratio.

The spinning solution of the present invention may further comprise a pigment to prevent Ag oxidation phenomenon.

The protective cover of the present invention includes a cover layer, a conductive metal layer laminated on an inner surface of the cover layer, and an Ag nanoweb layer formed by electrospinning a spinning solution stacked on the conductive metal layer and containing Ag nanomaterials.

The conductive metal layer of the present invention may be formed of a conductive metal plate, or may be manufactured in a wire form and then formed in a mesh form arranged perpendicularly to each other.

In addition, the present invention comprises the steps of preparing a cover layer; And electrospinning the spinning solution containing the Ag nanomaterial to form an Ag nanoweb layer laminated on the inner surface of the cover layer. It provides a method for manufacturing a protective cover for a mobile terminal.

As described above, the protective cover for a mobile terminal of the present invention may include a conductive metal layer on an inner surface of the cover layer to shield electromagnetic waves generated from the mobile terminal.

In addition, the protective cover for a mobile terminal of the present invention of the present invention may be provided with a silver or silver-bonded yarn on the inner surface of the cover layer can perform an antimicrobial function as well as electromagnetic shielding.

In addition, the protective cover for a mobile terminal of the present invention forms a metal layer formed on the inner surface of the cover layer as an antenna pattern and uses the same for DMB reception, thereby eliminating the need to install an external antenna in the mobile terminal, thus making the mobile terminal more convenient. It can be slim.

In addition, the protective cover for a mobile terminal of the present invention can improve the performance of the antenna by manufacturing a conductive twisted yarn using a metal yarn made of a conductive metal, and wound the metal yarn on the fiber yarn when manufacturing the conductive twisted yarn 1 The direction of the secondary process and the direction of the secondary process of twisting the twisted yarn and the twisted yarn or the twisted yarn and the fiber yarn can be made the same to create a structure in which the metal yarn is inserted into the fiber yarn. Since it can prevent, disconnection of an antenna pattern can be prevented.

In addition, the protective cover for a mobile terminal of the present invention forms a nano web layer by electrospinning a spinning solution containing Ag nanomaterials on the inner surface of the cover layer, thereby shielding electromagnetic waves generated from the mobile terminal and on the surface of the mobile terminal. It performs antibacterial function to remove various germs and radiates far infrared rays while smoothing blood circulation.

In addition, the protective cover for a mobile terminal according to the present invention can add a pigment to the spinning solution, thereby making the design beautiful and preventing the oxidation of Ag exposed to the outside.

In addition, the protective cover for a mobile terminal according to the present invention attaches a conductive metal plate to the cover layer to shield electromagnetic waves, and performs an antibacterial function by forming an Ag nanoweb layer by electrospinning a spinning solution containing Ag nanomaterials on the conductive metal plate. While the electromagnetic shielding performance can be improved.

1 is a perspective view of a portable terminal equipped with a protective cover according to a first embodiment of the present invention.

2 is a cross-sectional view of a protective cover according to an embodiment of the present invention.

3 is a plan view of a metal layer according to an embodiment of the present invention.

4 is a plan view in which an antenna pattern is formed on a metal layer according to an embodiment of the present invention.

5 is a plan view in which an antenna pattern is formed on a metal layer according to another exemplary embodiment of the present invention.

6 is a cross-sectional view of a double metal yarn used as a metal layer according to an embodiment of the present invention.

7 is a side view of a conductive twisted yarn used as a metal layer according to an embodiment of the present invention.

8 and 9 is a process flow chart showing a manufacturing process of the conductive twisted yarn according to an embodiment of the present invention.

10 is a cross-sectional view of a protective cover according to a second embodiment of the present invention.

11 is a cross-sectional view showing a form in which the fiber layer and the metal layer of the protective cover according to the second embodiment of the present invention are integrated together.

12 is a cross-sectional view of a protective cover according to a third embodiment of the present invention.

13 is a cross-sectional view of a protective cover according to a fourth embodiment of the present invention.

14 is a plan view of a mesh type metal layer according to a fourth embodiment of the present invention.

15 is a configuration diagram of an electrospinning apparatus for forming an Ag nanoweb layer of the present invention.

Figures 16a and 16b is a photograph of a state incubated to perform the antibacterial test by inoculating Staphylococcus aureus in the medium or the medium without the Ag nanoweb layer in accordance with the third and fourth embodiments of the present invention to be.

17A and 17B are photographs showing the cultured state for inoculation of pneumococcal pneumoniae inoculated into the medium containing or without the Ag nanoweb layer according to the third and fourth embodiments of the present invention to perform an antimicrobial test. to be.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In this process, the size or shape of the components shown in the drawings may be exaggerated for clarity and convenience of description. In addition, terms that are specifically defined in consideration of the configuration and operation of the present invention may vary depending on the intention or custom of the user or operator. Definitions of these terms should be made based on the contents throughout the specification.

1 is a perspective view of a portable terminal equipped with a protective cover according to an embodiment of the present invention, Figure 2 is a cross-sectional view of a protective cover according to a first embodiment of the present invention.

Referring to FIG. 1, a portable terminal according to an exemplary embodiment of the present invention includes a terminal main body 100 in which a display window 110 and a touch panel are installed on a front surface thereof, and is installed to be wrapped around an outer surface of the terminal main body 100. It includes a protective cover 200 having a structure that can be opened and closed so that the window 110 can be opened.

The portable terminal described in the present embodiment includes a portable electronic device such as a mobile phone, a smart phone, a notebook computer, a digital broadcasting terminal, a personal digital assistant (PDA), a portable multimedia player (PMP), and a navigation device. Any terminal can be applied.

The protective cover 200 includes a fixing part 210 coupled to the rear of the mobile terminal 100, a cover part 220 extending openably to the fixing part 210 to cover the front of the mobile terminal 100, and The connection part 230 may be connected between the fixing part 210 and the cover part 220 to be opened and closed.

As shown in FIG. 2, the protective cover 200 is attached to the cover layer 50 which maintains the strength of the cover, the adhesive layer 60 attached to the inner surface of the cover layer 50, and the adhesive layer 60. And a metal layer 70 formed of a conductive metal capable of shielding electromagnetic waves.

Here, the metal layer 70 may be an electrically conductive metal such as Ni, Cu, Al, and the like and alloys thereof having excellent electrical conductivity.

The metal layer 70 may be formed of a conductive metal thin film, and may have a structure in which a conductive metal as shown in FIG. 3 is manufactured in a thin wire form and then arranged in a mesh form to be bonded to the adhesive layer 60. have.

In addition, in order to impart antimicrobiality, the metal layer 70 may be formed of silver, which may have a conductivity containing pure silver (Ag) or silver (Ag), in the form of a wire. That is, silver (Ag) or silver alloy is manufactured in the form of a wire by drawing, and then wires are arranged to be orthogonal to each other to produce a mesh. Forming a metal layer using pure silver (Ag) or a silver alloy enables antimicrobial function and electromagnetic shielding, which are inherent properties of silver (Ag).

As another embodiment of the metal layer 70 of the present embodiment, the metal layer 70 may be formed in an antenna pattern when serving as an antenna for receiving DMB.

That is, as shown in Figure 4, the metal layer 70, the antenna portion 310 is formed in a pattern form to have the same antenna pattern as the DMB antenna, and is arranged at a predetermined interval on the lower side of the antenna portion 310 antibacterial Electromagnetic shielding unit 320 to perform the function and the electromagnetic shielding function.

Connection terminals 330 electrically connected to the portable terminal are formed at both ends of the antenna unit 310. The connection structure of the connection terminal 330 is to install a connector in the connection terminal 330 of the antenna unit, can be connected by inserting the connector into the socket installed in the mobile terminal, the connection terminal 330 in the process of manufacturing the mobile terminal And may be integrally connected to the mobile terminal, and various connection structures are possible.

In addition, the metal layer 70 according to another embodiment is formed in the form of an antenna pattern over the entire surface of the cover layer 50, as shown in Figure 5 to maximize the size of the antenna to improve the reception performance Application is possible. The antenna pattern may be formed in various forms according to the reception capability of the mobile terminal.

If the conductive twisted yarn according to another embodiment of the present invention is also formed in the form of an antenna pattern on the entire surface of the fiber layer, it may simultaneously perform an antimicrobial and electromagnetic shielding function as well as an antenna function.

And, as shown in Figure 6, the metal layer may be made of a double metal yarn 80 having a double structure to enhance the strength and reduce the cost of manufacturing costs. That is, the double metal yarn 80 includes a central metal layer 82 having a higher strength than silver (Ag) and elongation similar to silver, and a silver (Ag) layer 84 wrapped on the outer surface of the central metal layer 82. .

Here, the central metal layer 82 may be a conductive Cu or Cu-Zn alloy or the like.

As such, the double metal yarns 80 are arranged in a mutually orthogonal manner to form a mesh and then attached to the cover layer 50 by the adhesive layer 60. In the case of such a double metal yarn (80) can be given an antimicrobial performance, which is a unique property of silver, it can perform an antibacterial function as well as electromagnetic shielding.

In addition, the metal layer 70 may be made of conductive twisted yarn. That is, the conductive twisted yarn 300 is wound in a spiral form on the outer circumferential surface of the first fiber yarn 10 and the first fiber yarn 10, as shown in FIG. And one or more second fiber yarns 40 joined together with the first fiber yarn 10 on which one or more metal yarns 20 are wound.

Here, the metal yarn 20 may be a conductive metal such as aluminum or copper may be used when the electromagnetic wave shielding performance, and pure silver (Ag) or a silver alloy may be used to have antimicrobial properties when combined with the antimicrobial function.

The conductive twisted yarn according to the present embodiment has a structure capable of preventing the metal yarn 20 from being deformed or broken.

As such, in the manufacturing process of the conductive twisted yarn according to the embodiment, as shown in FIGS. 8 and 9, a plurality of metal yarns 20 are formed in one direction on the outer circumferential surface of the first fiber yarn 10 used as the screening. The first step of forming the primary twisted yarn 30 by winding to a twist number (T / M) of, and as shown in Figure 7, one or more strands of the primary twisted yarn 30 and one or more strands And a second process of twisting the fiber yarn 40 to produce a secondary twisted yarn.

As the first fiber yarn 10 and the second fiber yarn 40, any one of natural fibers and synthetic fibers having sufficient strength to be used as sewing thread may be used.

For example, the natural fiber may be made of any one of Hanji, polylactic acid (PLA), cotton, hemp, wool, and silk.

As the synthetic fiber, for example, a fiber made of any one of nylon, polyester, polyvinyl chloride, polyacrylonitrile, polyamide, polyolefin, polyurethane, and polyfluoroethylene can be used.

Furthermore, the synthetic fiber can use the fiber obtained using the following polymer.

Polyethylene-based resins such as low density polyethylene resins (LDPE), ultra low density polyethylene resins (LLDPE), high density polyethylene (HDPE), ethylene-vinylacetate resins (EVA), copolymers thereof, and the like.

Polystyrene-based resins such as HIPS, GPPS, SAN, etc.

Polypropylene-based resins, for example HOMO PP, RANDOM PP, copolymers thereof

Transparent or ordinary ABS (acrylonitrile-butadiene-styrene terpolymer)

-Rigid PVC

Engineering plastics such as nylon, PRT, PET, POM (acetal), PC, urethane, powder resin, PMMA, PES, etc.

In addition, the first fiber yarn 10 and the second fiber yarn 40 can be used any fiber yarn that can be used as a screening in addition to the natural fibers or synthetic fibers described above.

The metal yarn 20 may be a silver alloy or aluminum, copper, or a conductive metal containing pure silver (Ag) or silver (Ag) and having conductivity so as to have antibacterial properties.

When winding the metal yarn 20 on the outer circumferential surface of the first fiber yarn 10, the number of twists (T / M) of the metal yarn 20 is higher than the prescribed formula number (T / M) calculated twist (T / M) ), The metal yarn 20 is wound on the outer circumferential surface of the first fiber yarn 10 in the same spiral shape as the coil spring.

As an example, the twist count (T / M) of the metal yarn 20 is set to 600 to 1500T / M so as to have a high twist count.

The direction in which the metal yarn 20 of the primary twisted yarn 30 manufactured in the first step is wound and the direction when the primary twisted yarn 30 and the fiber yarn 40 are twisted in the second step is the same direction. When the work proceeds to form the metal yarn 20 into the fiber yarn 40, the metal yarn 20 does not protrude out of the fiber yarn 40.

That is, since the conductive twisted yarn of the present invention has a twist number T / M greater than or equal to a predetermined value on the outer circumferential surface of the first fiber yarn 10 in the first step, it is wound in a spiral form like a coil spring. When the stretching occurs in the first fiber yarn 10, the metal yarn 20 is relaxed and contracted in the same function as the coil spring, thereby preventing the deformation of the metal yarn 20.

In addition, when the at least one of the twisted yarn 30 and at least one second fiber yarn 40 in the secondary process, the metal yarn 20 is wound in the same direction as the winding direction of the metal yarn 20. It becomes a structure that went into the two fiber yarn 40 to prevent the metal yarn 20 from protruding to the outside of the second fiber yarn (40).

Therefore, the conductive twisted yarn in which the metal yarn is inserted according to the present embodiment may prevent deformation of the metal yarn inserted in the fiber yarn even in the strength and repeated reciprocating motion necessary when weaving integrally with the fiber layer or sewing the fiber layer.

10 is a cross-sectional view of a protective cover according to a second embodiment of the present invention, Figure 11 is a cross-sectional view showing a form in which the fiber layer and the metal layer of the protective cover according to the second embodiment of the present invention are integrally woven.

Referring to FIG. 10, the protective cover according to the second embodiment of the present invention includes a cover layer 50 for maintaining the strength of the cover, an adhesive layer 60 attached to the inner surface of the cover layer 50, and an adhesive layer 60. Metal layer 70 adhered to the metal layer and formed of a conductive metal material capable of shielding electromagnetic waves, and a fiber layer 90 laminated on the metal layer 70 to protect the metal layer 70 and maintain a soft texture.

Here, the metal layer may be formed of any one of the above-described conductive metal thin film and the conductive metal form of the mesh form, and a silver made of pure silver or a silver alloy containing silver in the form of wire may be used, Conductive plywood may be used.

Here, the metal layer may be woven like a fibrous layer when silver or conductive twisted yarn is used. That is, as shown in Figure 11, when weaving the fibrous layer may have a double structure in which the metal layer is woven together under the fiber layer.

As such, when the fiber layer and the metal layer are woven together, the metal layer may be exposed between the fiber layers, which is suitable for performing an antibacterial function and simplifies the manufacturing process.

12 is a sectional view of a protective cover according to a third embodiment of the present invention, FIG. 13 is a sectional view of a protective cover according to a fourth embodiment of the present invention, and FIG. 14 is a mesh type according to a fourth embodiment of the present invention. Top view of the metal layer.

Referring to FIG. 12, the protective cover according to the third embodiment of the present invention electrospins the cover layer 510 for maintaining the strength of the cover and the spinning solution containing Ag nanomaterials on the inner surface of the cover layer 510. Ag nano web layer 520 is formed.

Here, the Ag nanoweb layer 520 contains Ag nanomaterials to perform antimicrobial function and electromagnetic shielding function.

Ag nanomaterials are silver (Ag, Silver) metal salts such as silver nitrate (AgNO ₃ ), silver sulfate (Ag ₂ SO ₄ ), and silver chloride (AgCl). Ag nanomaterials in various solid states, including powder form, may be used.

The Ag nanoweb layer 520 according to the present embodiment forms the ultrafine fiber strands by electrospinning the spinning solution containing Ag nanomaterials, and accumulates the ultrafine fiber strands to a predetermined thickness to form a nanoweb.

Here, the radiation method applied to the present invention is a general electrospinning, air electrospinning (AES: Air-Electrospinning), electrospray (electrospray), electrobrown spinning, centrifugal electrospinning Flash-electrospinning can be used.

That is, the Ag nanoweb layer 520 of the present invention can be applied to any spinning method of the spinning method that can be made in the form of the ultra-fine fiber strands accumulated.

The spinning solution is formed by mixing Ag nanomaterial, an electrospinable polymer material and a solvent in a proportion. Here, it is preferable that Ag nanomaterial is specifically used silver nitrate (AgNO ₃ ).

In addition, since Ag is attached to the inner surface of the cover layer 510 and exposed to the outside, the color may change due to Ag oxidation. In order to prevent this, a pigment may be added to the spinning solution to prevent Ag oxidation from being seen and to beautify the design of the protective cover.

Here, the color of the pigment may be used black or gray, in addition to a variety of colors that can not be seen Ag oxidation.

Herein, the electrospun polymer material may be, for example, polyvinylidene fluoride (PVDF), poly (vinylidene fluoride-co-hexafluoropropylene), perfuluropolymer, polyvinylchloride or polyvinylidene chloride And copolymers thereof and polyethylene glycol derivatives including polyethylene glycol dialkyl ether and polyethylene glycol dialkyl ester, polyoxides including poly (oxymethylene-oligo-oxyethylene), polyethylene oxide and polypropylene oxide, polyvinyl Polyacrylonitrile copolymers including acetates, poly (vinylpyrrolidone-vinylacetate), polystyrene and polystyrene acrylonitrile copolymers, polyacrylonitrile methyl methacrylate copolymers, polymethylmethacrylates, polymethyl Methacrylate copolymers and mixtures thereof Can be used.

As described above, since the Ag nanoweb layer 520 of the present invention is formed on the surface of the cover layer by an electrospinning method, the Ag nanoweb layer 520 may be manufactured in various thicknesses according to the radiation amount of the spinning solution, and the surface is smooth, and thus the contact feeling is good. have.

In addition, when forming the Ag layer for electromagnetic shielding and antimicrobial function by forming the electrospinning method, it is easy to manufacture and can prevent the phenomenon that the Ag layer is separated and can be manufactured in various thicknesses.

As shown in FIG. 13, the protective cover for a mobile terminal according to the fourth embodiment includes a cover layer 510 for maintaining the strength of the cover and a metal layer attached to an inner surface of the cover layer 510 to perform electromagnetic shielding. 530 and an Ag nanoweb layer 520 formed by electrospinning a spinning solution that is stacked on the metal layer 530 and contains Ag nanomaterials.

Here, the metal layer 530 may be an electrically conductive metal such as Ni, Cu, Al, or an alloy thereof having excellent electrical conductivity.

The metal layer 530 may be formed of a conductive metal thin film, and may be formed in a mesh form in which a conductive metal as shown in FIG. 14 is formed in a thin wire 532 and arranged orthogonally.

In addition, the metal layer 530 may be made of pure silver or silver-containing silver alloy in the form of a wire, and may be used in the form of a mesh-shaped silver yarn orthogonally arranged.

The metal layer 530 and the Ag nanoweb layer 520 may be manufactured separately from each other and then laminated to a subsequent process, and may be manufactured by directly electrospinning the Ag nanoweb layer 520 on the surface of the metal layer 530.

15 is a block diagram showing an electrospinning apparatus for forming an Ag nanoweb layer according to the present invention.

The electrospinning apparatus of the present invention is a mixing tank (550) in which a spinning solution in which Ag nanomaterials, a polymer material, and a solvent are mixed in a predetermined ratio is stored, and a high voltage generator is connected to the mixing tank (550). Spinning nozzle 54 for radiating the ultra-fine nanofibers, and is located on the lower surface of the spinning nozzle 554 and installed so as to be movable in the front and rear or left and right directions to collect the ultra-fine nanofibers emitted from the spinning nozzle 554 to a certain thickness And a collector 556 that forms the Ag nanoweb layer 520.

The mixing tank 550 is provided with a stirrer 558 to uniformly mix Ag nanomaterials, polymer materials and solvents, and to maintain a constant viscosity of the spinning solution.

By applying a high voltage electrostatic force of 90 to 120 Kv between the collector 556 and the radiation nozzle 554, the ultra-fine fiber strand 516 is radiated, and the ultra-fine fiber strand 516 is accumulated in the collector 556, so that the Ag nanoweb layer 520 ).

The spinning nozzle 554 is provided with an air injector 574 to prevent the ultra-fine fiber strands 516 emitted from the spinning nozzle 554 from being collected by the collector 556 and flying.

The multi-hole spin pack nozzle of the present invention is set to the air pressure of the air injection in the range of 0.1 ~ 0.6MPa. In this case, if the air pressure is less than 0.1MPa, it does not contribute to the collection / accumulation. If the air pressure is more than 0.6MPa, the end of the spinning nozzle is hardened to block the needle, which causes radiation trouble.

The release film 540 is disposed when only the Ag nanoweb layer 520 is formed in the collector 56, and the cover layer is disposed when directly electrospinning the inner surface of the cover layer, and the metal layer is disposed when directly electrospinning the metal layer. do.

That is, as in the third embodiment of the present invention, when the Ag nanoweb layer 520 is directly formed on the inner surface of the cover layer, the cover layer is disposed on the upper surface of the collector 556 and then the inner surface of the cover layer in the radiation nozzle. The ultrafine fiber strands are radiated, and the ultrafine fiber strands are accumulated on the inner surface of the cover layer to form Ag nanoweb layer 520 having a predetermined thickness.

When the metal layer is attached to the cover layer as in the fourth embodiment of the present invention, after the metal layer is disposed on the top surface of the collector, the ultrafine fiber strands are radiated onto the metal layer by the spinning nozzle, and the ultrafine fiber strands are accumulated on the surface of the metal layer. As a result, Ag nanoweb layer 520 having a predetermined thickness is formed.

In addition, when the metal layer and the Ag nanoweb layer 520 are manufactured separately and then laminated together, the release film is placed on the upper surface of the collector, and then the ultra-fine fiber strands are radiated onto the surface of the release film in the spinning nozzle, and the surface of the release film is formed. The ultrafine fiber strands are accumulated on the Ag nanoweb layer 520 having a predetermined thickness.

Here, as described above, the conductive metal plate may be used, the conductive metal plate in the form of a mesh may be used, and the silver formed in the mesh form using Ag wire may be used as described above.

The rear side of the collector 564 is provided with a pressure roller 580 for pressing (calendering) the Ag nanoweb layer 520 to a predetermined thickness.

Thus, the process of manufacturing an Ag nanoweb layer using the electrospinning apparatus comprised is demonstrated below.

First, when the collector 564 is operated, the table is moved in the front-rear direction or the front-rear / left-right direction. Then, by applying a high voltage electrostatic force between the collector 564 and the first radiation nozzle 554, the spinning solution is made into ultra-fine fiber strands 516 in the first radiation nozzle 554 to emit to the collector.

As a result, the ultrafine fiber strands 516 are accumulated in the collector to form the Ag nanoweb layer 520.

At this time, when spinning the fiber strands 516 in the air injector 574 installed in the spinning nozzle 554, by spraying air to the fiber strands 516 is collected in the collector without flying the strands 516 To be integrated.

Herein, any one of a release film, a cover layer, or a metal layer is disposed on the collector to form an Ag nanoweb layer 520 on the release film, an Ag nanoweb layer 520 is formed on the cover layer, or an Ag nanoweb layer 520 on the metal layer. ) May be formed.

Figures 16a and 16b is a photograph of a state incubated to perform the antibacterial test by inoculating Staphylococcus aureus in the medium or the medium without the Ag nanoweb layer in accordance with the third and fourth embodiments of the present invention 17A and 17B are photographed the cultured to perform the antimicrobial test by inoculating pneumococcal pneumoniae in the medium with or without the Ag nanoweb layer in accordance with the third and fourth embodiments of the present invention One picture.

In order to test the Ag nanoweb layer applied to the third and fourth embodiments of the present invention for antibacterial activity, first, a polyacrylonitrile (PAN) polymer and silver nitrate (AgNO ₃ , a purity of 99.999%, a first-class reagent) were mixed. A spinning solution was prepared by dissolving 12 wt.% In solvent DMAc. At this time, the content of the silver nitrate was configured to be 5wt.% Relative to the PAN.

Thereafter, the prepared spinning solution was transferred to a spinning nozzle pack and electrospun in a spinning atmosphere at 30 ° C. and a relative humidity of 60% so that the applied voltage was 25 kV, the distance between the spinning nozzle and the current collector was 20 cm, and the discharge amount was 0.05 cc / ghole per minute. Was carried out to obtain an Ag nanoweb layer.

As described above, the Ag nanoweb layer thus prepared was formed by laminating PAN nanofibers containing 5 wt.% Of silver nitrate. Strains used were inoculated with Staphylcoccus aureus ATCC 6538 (strain 1), a major cause of food poisoning, and Klebsiella pneumoniae ATCC 4352 (strain 2), a pneumococcal strain, on a 0.05% nonionic surfactant (Snogen). And bacteria cultured at 37 ° C. for 24 hours were used as inoculum. As a result of test results at the FITI (Friend of Industry Technology Information) tester, the inoculated and cultured in the medium (# 1) with the Ag nanoweb layer applied in the present invention was inoculated in the medium without the Ag nanoweb layer (BLANK). As a result, the bactericidal reduction rate was 99.9% than that of the culture.

That is, it can be seen that the culture strains of FIG. 16B and FIG. 17B having the Ag nanoweb layer (1) with respect to the culture medium are significantly reduced than those of FIG. 16A and FIG. 17A having the Ag nanoweb layer without the medium (BLANK).

In the above, the present invention has been illustrated and described with reference to specific preferred embodiments, but the present invention is not limited to the above-described embodiments, and the present invention is not limited to the spirit of the present invention. Various changes and modifications will be possible by those who have the same.

The present invention provides a protective cover for a mobile terminal having an electromagnetic shielding, antibacterial or antenna function for receiving DMB.

Claims (20)

1. Cover layer;

   An adhesive layer laminated on an inner surface of the cover layer; And

   A protective cover for a mobile terminal comprising a metal layer attached to the adhesive layer to shield the electromagnetic waves.
2. The method of claim 1,

   The metal layer is a protective cover for a mobile terminal, characterized in that formed of a conductive metal thin film.
3. The method of claim 1,

   The metal layer is formed in the form of a wire, the protective cover for a mobile terminal, characterized in that arranged in orthogonal to each other to form a mesh.
4. The method of claim 1,

   The metal layer is a protective cover for a mobile terminal, characterized in that the pure silver (Ag) or silver alloy so as to have an antimicrobial performance.
5. The method of claim 1,

   The metal layer is formed of a double metal yarn,

   The double metal yarn includes a center metal layer having a strength higher than silver and having an elongation equal to or higher than silver, and a silver layer wrapped on an outer surface of the center metal layer. .
6. The method of claim 1,

   The metal layer is formed of a conductive twisted yarn, the conductive twisted yarn is a first fiber yarn formed of synthetic fibers or natural fibers;

   A metal yarn wound in a spiral form on the outer circumferential surface of the first fiber yarn and having antimicrobial activity and conductivity; And

   A protective cover for a mobile terminal, characterized in that it comprises one or more strands of the second fiber yarn is joined with the first fiber yarn wound one or more metal yarns.
7. The method of claim 6,

   The metal yarn is a protective cover for a mobile terminal, characterized in that formed of pure silver, silver alloy or other conductive metal.
8. The method of claim 1,

   The metal layer is formed of an antenna pattern for receiving DMB protective cover for a mobile terminal, characterized in that to perform the function of the antenna for receiving DMB.
9. The method of claim 8,

   Connection terminals are formed at both ends of the antenna pattern, and the connection terminal is a protective cover for a mobile terminal, characterized in that it is electrically connected to the mobile terminal.
10. The method of claim 1,

    A protective cover for a mobile terminal further comprising a fiber layer laminated on the metal layer to protect the metal layer.
11. The method of claim 10,

    The metal layer is formed of any one of a silver yarn, a conductive twisted yarn, and a double metal yarn, when weaving the fiber layer, the protective cover for a mobile terminal, characterized in that weave together as the lower side of the fiber layer.
12. Cover layer; And

    A protective cover for a mobile terminal, comprising: an Ag nanoweb layer laminated on an inner surface of the cover layer and formed by electrospinning a spinning solution containing Ag nanomaterials.
13. The method of claim 12,

    The spinning solution is a protective cover for a mobile terminal, characterized in that the Ag nanomaterial, the electrospinable polymer material and the solvent is formed by mixing at a predetermined ratio.
14. The method of claim 12,

    The radiation solution is a protective cover for a mobile terminal, characterized in that it further comprises a pigment to prevent the Ag oxidation phenomenon.
15. The method of claim 12,

    Further comprising a conductive metal layer laminated on the inner surface of the cover layer,

    The radiation solution containing the Ag nanomaterial is electrospun into the conductive metal layer, and the Ag nano web layer is laminated on the conductive metal layer.
16. The method of claim 15,

    The conductive metal layer is a protective cover for a mobile terminal, characterized in that formed of a conductive metal plate.
17. The method of claim 15,

    The conductive metal layer is manufactured in the form of a wire protective cover for a mobile terminal, characterized in that formed in the form of a mesh arranged perpendicular to each other.
18. The method of claim 15,

    The conductive metal layer is a protective cover for a mobile terminal, characterized in that the use of pure silver or silver-containing silver alloy in the form of a wire after the mesh is arranged to be orthogonal to each other.
19. Preparing a cover layer; And

    And electrospinning a spinning solution containing Ag nanomaterial to form an Ag nanoweb layer laminated on the inner surface of the cover layer.
20. The method of claim 19,

    A conductive metal layer is further laminated on the inner surface of the cover layer,

    And electrospinning the spinning solution onto the conductive metal layer to form the Ag nanoweb layer on the conductive metal layer.

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