KR101412710B1 - Filter having permeability and hydrophobic property - Google Patents

Abstract

A breathable polymer mesh in which monofilaments made of polymer resin are woven in a lattice to form holes of a certain size and arrangement; A polymer web laminated on at least one of an upper surface and a lower surface of the polymer mesh and having uneven fine holes formed by entanglement of a plurality of polymer fibers; And a fluororesin coating layer coated as a whole in a state where the polymer mesh and the polymer web are laminated, wherein the polymer mesh and the polymer web are adhered to each other to constitute a monolith.

Description

[0001] The present invention relates to a filter having permeability and hydrophobic property,

The present invention relates to a filter, and particularly to a filter having a fluororesin coating layer formed on a laminated structure of a polymer mesh and a polymer web or a laminated structure of a polymer mesh to improve air permeability and hydrophobicity.

BACKGROUND OF THE INVENTION [0002] Electronic devices such as flat-panel loudspeakers or smart phones are equipped with sound transducers, such as microphones, signalers, speakers or buzgers, which need to be protected from external contaminants such as liquids or dust.

An acoustic transducer is an electrical component that converts an electrical signal to sound or vice versa and is physically susceptible to damage and is mounted in a protective housing having a hole at a location corresponding to the acoustic transducer. These holes prevent the large pieces from entering the housing and damaging the acoustic transducer while allowing the system to transmit or receive sound signals with minimal acoustic loss.

However, since these holes do not protect the acoustic transducer from liquids such as effluent or rainwater or other particles and other particles, a protective cover is used which includes a filter between the acoustic transducer and the housing as a secondary barrier to the hole. In other words, the protective cover transmits sound while preventing unwanted contaminants from reaching sensitive components in the device.

Thus, it is desirable for the protective cover assembly to achieve these contamination protection while minimizing the overall impact on the acoustic losses of the system.

On the other hand, many electronic components included in a computer apparatus or the like generate heat to be discharged, and as the temperature increases due to the generated heat, the failure rate of the internal electronic components increases. Therefore, It is important. To this end, many electronic devices use an electric fan to cool and increase the flow inside. These systems require openings or holes in the housing to allow cooling air to be introduced and heated air to be released, while large openings reduce air flow resistance and thereby increase the cooling effect, but unwanted liquid and dust particles And potentially damaging sensitive components.

Thus, there is an industrial need for a protective cover that provides low air flow resistance, low acoustic loss, and prevents contaminants from entering the device housing.

Korean Patent Publication No. 2006-0085958

Therefore, an object of the present invention is to provide a filter in which adhesion is reliably performed in a laminated structure of a polymer web and a polymer mesh.

Another object of the present invention is to provide a filter improved in breathability and hydrophobicity.

Another object of the present invention is to provide a filter in which the size and number of holes of the polymer mesh are constant and the quality of sound transmission is uniform.

Another object of the present invention is to provide a filter which lowers the thermal melting temperature of the polymer mesh and increases the mechanical strength.

The above object is achieved by a breathable polymer mesh in which a monofilament made of a polymer resin is woven in a lattice shape to form holes of a predetermined size and arrangement; A polymer web laminated on at least one of an upper surface and a lower surface of the polymer mesh and having uneven fine holes formed by entanglement of a plurality of polymer fibers; And a fluororesin coating layer coated entirely on the polymer mesh and the polymer web in a laminated state, wherein the polymer mesh and the polymer web are bonded together to form a monolith. Filter.

The above object is achieved by a breathable first polymer mesh having monofilaments of a polymer resin woven in a lattice shape to form holes of a predetermined size and arrangement; A breathable second polymer mesh laminated on at least one of an upper surface and a lower surface of the first polymer mesh and having monofilaments of a polymer resin woven in a lattice shape to form holes of a predetermined size and arrangement; And a fluororesin coating layer coated as a whole in a state where the first and second polymer meshes are laminated, wherein the first and second polymer meshes are bonded by the coating to form a monolithic structure. Lt; / RTI >

Preferably, the thickness of the polymer mesh may be greater than the thickness of the polymer web.

Preferably, the monofilament of the polymer mesh may be polyester (PET).

Preferably, the monofilament may be coated with a fluororesin or a fluoropolymer resin.

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Preferably, the monofilaments of the first and second polymer meshes have different diameters, and the fluororesin coating layer may have irregular shapes and thicknesses depending on the different diameters.

Preferably, the fluororesin is PTFE (Polytetrafluoroethylene).

Preferably, the fibers may be formed by at least one of curing or evaporation of a solvent by spraying a liquid polymer.

Preferably, the overlapping fibers in the polymer web can be adhered to each other.

Preferably, the filter is manufactured in a roll state and cut to a certain size by a blade.

According to the above structure, adhesion can be reliably performed by the fluororesin coating layer in the laminated structure between the polymer web and the polymer mesh or the polymer mesh.

In addition, since the adhesion of the polymer web and the polymer web having the fine pores is surely formed over the entire surface by the fluororesin coating layer, the size of the pores is reduced as a whole and the fluororesin, which is a hydrophobic material, The hydrophobicity is greatly improved.

The present invention also provides a filter in which the size and number of holes of the polymer mesh are constant and the quality of sound transmission is uniform.

In addition, the diameter of the monofilaments can be sufficiently secured by increasing the number of the mesh holes by the lamination between the polymer meshes, thereby lowering the heat melting temperature of the polymer mesh and increasing the mechanical strength.

1 is a perspective view showing a filter according to an embodiment of the present invention.
2 is a cross-sectional view showing a filter.
Fig. 3 shows a process for producing a filter according to the present invention.
4 shows a monofilament of a filter according to another embodiment of the present invention.
5 shows a filter according to another embodiment of the present invention.
6 shows a filter according to another embodiment of the present invention.
7 shows a filter according to another embodiment of the present invention.
8 shows an example in which the filter of the present invention is applied.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a perspective view showing a filter according to an embodiment of the present invention, and FIG. 2 is a sectional view showing a filter.

The filter 100 is composed of a polymer mesh 110 and a polymer web 120 laminated on the polymer mesh 110. The laminate of the polymer mesh 110 and the polymer web 120 is coated with a fluororesin to form a fluororesin coating layer 130, .

Preferably, the thickness of the polymer mesh 110 may be greater than the thickness of the polymer web 120.

The fluororesin constituting the fluororesin coating layer 130 is not particularly limited, but may preferably be PTFE (Polytetrafluoroethylene).

The polymer mesh 110 is formed by weaving monofilaments 112 made of a polymer resin in a lattice shape and has holes 114 of a predetermined size and arrangement. The shape of the holes 114 is not particularly limited, It can be a square.

If the number of the holes of the polymer mesh 110 is large, the waterproof effect is good but the air permeability is low. Preferably, the mesh count of the mesh may be 130 mesh to 450 mesh. Here, as the number of holes in the mesh increases, the thickness of the mesh becomes thinner, and as a result, the heat melting temperature becomes low.

The monofilament 112 may be polyester (PET) having good mechanical strength and good heat resistance, and may preferably be coated with a fluororesin or a fluorine-containing polymer resin. The monofilament 112 may also be plated with metal to provide an anti-static or electromagnetic shielding effect.

Monofilaments 112 having the same diameter or different diameters in at least one of longitudinal and transverse directions may be alternately arranged.

The polymer web 120 has a plurality of polymer fibers 122 entangled to form a fiber web structure and forms uneven fine holes 124 in which one or more plies are overlapped and connected in the thickness direction.

The diameter of the fiber constituting the fiber web may vary, but may be a nanofiber having a diameter of 1000 nm or less, and the material of the fiber 122 may be a usual polymer resin or a fluorine-containing polymer resin.

The elasticity of the polymer web 120 is improved by the fiber web structure, and the hydrophobicity can be improved by the use of the hydrophobic fluorine material and the structural characteristic by the fine holes 124.

The polymer mesh 110 and the polymer web 120 are coated with a fluorocarbon resin and thermally cured to form a monolithic filter 100. The polymer web 110 and the polymer web 120 are coated with a fluororesin coating, Are adhered firmly to each other and have overall hydrophobicity.

In this embodiment, the polymer web 110 is laminated on one side of the polymer mesh 110. However, the polymer web 110 may be laminated on both sides of the polymer mesh 110 without limitation.

The fiber 122 is formed by at least one of curing or evaporation of a solvent by spraying a liquid polymer. Preferably, the upper and lower fibers 122 in the polymer web 120 are bonded together.

Hereinafter, a method of manufacturing a filter according to an embodiment of the present invention will be described.

Fig. 3 shows a process for producing a filter according to the present invention.

Polyester (PET) monofilaments made of rolls having a certain width and having a diameter of about 30 microns are roll-woven in a lattice pattern having a uniform hole size of 130 to 450 mesh 10) is prepared.

The polymer web 120 is formed in one layer or multiple layers on the polymer mesh 110 by, for example, electro spinning. When the liquid polymer is sprayed through the fine diameter nozzle of the spray gun 12, And the polymer web 120 is deposited on the polymer mesh 110.

In this way, the polymer web 110 is impregnated in the impregnation tank 20 containing the liquid fluorine resin in the state that the polymer web 110 is laminated on the polymer mesh 110. During the transportation, the tension is always maintained and the polymer mesh 110 The polymer web 120 is coated with a liquid fluororesin while being pressed by the rolls 21, 22 and 23 provided in the impregnation tank 20.

Although the impregnation is shown by the coating method in this embodiment, it is needless to say that it can be coated by the spray method.

The polymer web 110 coated with the liquid fluororesin and the polymer web 120 are thermally cured while passing through the oven 30 to form the fluororesin coating layer 130 to finally form the filter 100 And is wound by the roll 40.

According to the embodiment, the polymer web and the polymer web having the fine pores are reliably adhered to the entire surface by the fluororesin coating layer 130, thereby reducing the size of the pores as a whole, The hydrophobicity is greatly improved because the coating is performed by the fluorine resin.

In addition, although the polymer web is laminated, the sound transmission is uniformed by the holes having the constant size of the polymer mesh, thereby improving the quality uniformity of sound transmission.

4 shows a monofilament of a filter according to another embodiment of the present invention.

The filter is composed of a polymer mesh and a polymer web laminated on the polymer mesh, and the laminate of the polymer mesh and the polymer web is coated with a fluororesin to form a fluororesin coating layer, as in the above embodiment.

According to this embodiment, the powder 123 is arranged in the longitudinal direction inside the fiber 122 constituting the polymer web 120 and the surface of the fiber 122 in the portion corresponding to the position of the powder 123 And the powder 123 itself is exposed to form the protrusions 122a and 122b.

With this configuration, the projections 122a and 122b protruding from the surface of the fiber 122 cause the fiber 122 itself to have a Lotus effect, and the fiber 122 is intertwined with the polymer web 120 ) Is improved.

In the present invention, the protrusions 122a and 122b are formed on the surface of the fiber 122 by the powder 123 arranged inside the fiber 122, so that the hydrophobic property is obtained by constituting the rough surface.

Powder 123 may be a ceramic or a polymer, which may be a metal oxide, thermally conductive alumina or boron, and the like.

The powder 123 may be a metal, a metal oxide, a carbon, a ceramic, or a polymer. In particular, in the case of a polymer, fluorine powder containing a fluorine component may be used to improve hydrophobicity, and carbon may be carbon black or carbon nanotube (CNT).

The size of the powder 123 may be larger or smaller than the diameter of the fiber 122 so that the protrusions 122a and 122b are more easily formed on the surface of the fiber 122 in a large case. Even when the size of the powder 123 is small, a large number of the powders 123 can be gathered in one place to form a large mass, and the protrusions 122a and 122b can be easily formed.

As the number of the projections 122a and 122b increases, hydrophobicity improves. The shapes of the projections 122a and 122b vary depending on the size, shape and amount of the powder 123.

If the powder 123 is too much, the viscosity becomes too high to manufacture the fiber 122 containing the powder 123, and the fiber 122 may be easily broken. If the powder 123 is put too much, You can not contribute.

Therefore, the fiber 122 is manufactured by adding the size, shape, and amount of the powder 123 suitable for use such as mechanical strength and degree of hydrophobicity.

The shape of the powder 123 is not particularly limited, and may be spherical, polygonal, dendrite, or amorphous. However, when the shape of the powder is polygonal, there is an advantage that the outer area is widened to improve the hydrophobicity.

The powder 123 is arranged in the longitudinal direction inside the fiber 122 in the process of forming the fiber 122 by being sprayed through a nozzle having a fine diameter in a state of being uniformly dispersed in the liquid polymer and then curing or evaporating the solvent, The projections 122a and 122b are formed on the surface of the fiber 122. [

Particularly, when the powder 123 has electrical conductivity or electrical reversal conductivity, the polymer web 120 made of the fiber 122 containing the powder 123 can prevent the static electricity or shield the electromagnetic wave.

5 shows a filter according to another embodiment of the present invention.

When the fluororesin powder remaining from the liquid fluororesin impregnated on the monofilament 212 of the polymer mesh 210 is melted by heat until the temperature of the monofilament 212 is lower than the melting temperature and before the time of melting, The fluororesin coating layer 216 is formed with an irregular shape and thickness while being connected to each other.

According to the above structure, a fluororesin coating layer having irregular shape and thickness can be formed, thereby securing a mesh hole of a certain size by a relatively thin portion, and using a nonwoven fabric having excellent air permeability and having a very uneven hole It is possible to provide a uniform air permeability.

In addition, since the fluororesin coating layer has an irregular shape and thickness like the dumbbell shape, the surface area is increased, and the irregular shape of the fluororesin coating layer acts like a projection to have a lotus effect, thereby improving the hydrophobicity. As a result, The hydrophobicity is improved.

Further, since the melted material is melted by heating up to the melting temperature of the monofilament and the time before the melting, the manufacturing speed is fast and the manufacturing time is shortened, and the production yield is excellent and the working equipment is simple.

6 shows a filter according to another embodiment of the present invention.

The fluororesin coating layer 316 having irregular shapes and thickness can be formed by applying the polymer mesh 310 formed by weaving monofilaments 312 and 313 having different diameters.

In the embodiment of Fig. 5, since the diameter of the monofilaments is the same, the working conditions for heat melting of the fluororesin powder, i.e., the working temperature and the working time are controlled and provided in order to form the fluororesin coating layer having irregular shape and thickness have.

However, according to this embodiment, the fluororesin coating layer having irregular shape and thickness can be formed by applying the polymer mesh 310 formed by weaving the monofilaments 312, 313 having different diameters.

Specifically, as shown in Fig. 6, monofilament 313 having a diameter of 25 microns and monofilament 312 having a diameter of 40 microns in at least one of longitudinal and transverse directions are alternately arranged and weaving Thereby forming a polymer mesh 310.

As shown in FIG. 7, the polymer mesh 310 is bent according to each mesh hole 314, and as a result, the surface of the polymer mesh 310 as a whole increases and the irregular plane structure The irregularity in the shape and thickness of the fluororesin coating layer results in an improvement in hydrophobicity due to the effect of the longevity.

Further, the monofilaments having a large diameter are difficult to melt by heat, thereby increasing the heat melting temperature of the polymer mesh 310 as a whole, thereby facilitating the formation of a fluororesin coating layer which melts at high temperatures.

It is needless to say that the polymer mesh of this embodiment can be applied to the embodiment of Fig. That is, since the fluorine resin powder is thermally melted in the polymer mesh formed by weaving the monofilaments having different diameters, it is possible to provide the working temperature and the working time until the adjacent fluororesin powders are evenly joined together to form irregular dumbbell shape And a fluororesin coating layer having a thickness can be formed.

7 shows a filter according to another embodiment of the present invention.

According to this embodiment, the polymer web 420 in the embodiment of FIG. 1 is replaced with the polymer web 420, and as a result, the polymer mesh 410 and the polymer mesh 420 are stacked.

Generally, it is difficult to make the holes of the polymer mesh woven with polymer monofilaments to a very small size such as the number of holes of 700 mesh. When the number of holes is increased, the diameter of the monofilaments becomes thinner and the thermal melting temperature as a whole lowers. It is not only difficult to form a resin coating layer but also has a low mechanical strength.

Thus, by stacking the polymer mesh 410 and the polymer mesh 420 having the same or different mesh hole numbers, the total number of mesh holes can be increased and the diameter of the monofilaments 412 and 422 of the polymer meshes 410 and 420 So that the fluororesin coating can be easily performed and the sufficient diameter of the monofilaments 412 and 422 can be ensured and the mechanical strength is increased.

8 shows an example in which the filter of the present invention is applied.

Here, the filter 100 is manufactured in a roll state and can be cut and supplied to a predetermined size by a blade.

Referring to FIG. 8A, the double-sided adhesive tape 140 is adhered along the edge of the filter 100 except for the central portion, and the release sheet 150 is adhered to the upper surface of the adhesive tape 140 to form a protective cover.

Preferably, a tab 152 protrudes at one side of the release sheet 150 to facilitate gripping when the release sheet 150 is removed from the double-sided adhesive tape 140.

8 (b), an opening, that is, an input / output hole 52, is formed in the housing 50 corresponding to a speaker or a receiver mounted on a cellular phone. A filter 100 is disposed inside the input / output hole 52 Respectively. That is, the release sheet 150 of the filter 100 is removed, and the double-sided adhesive tape 140 adhered to the edge of the filter 100 is adhered to the housing 50.

As described above, since the filter 100 has air permeability and hydrophobicity, it can effectively block the water 60 from the outside, and the sound outputted from the speaker (not shown) And is smoothly outputted through the hole 114 formed over.

In this embodiment, the use of the filter 100 in the opening for sound transmission of a mobile communication device is exemplified, but not limited thereto, can be used for anti-static or electromagnetic shielding applications.

In addition, it can be used for wrapping a printed circuit board or a module on which electronic parts sensitive to immersion of water are mounted in a mobile communication device. In this case, the filter 100 is electrically insulated. When the filter 100 is used for wrapping a printed circuit board or module on which an electronic component is mounted, there is an advantage that the printed circuit board or module can be protected from water when the mobile communication device is submerged for a while.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. Accordingly, the scope of the present invention should not be construed as being limited to the embodiments described above, but should be construed in accordance with the following claims.

10; housing
12; Output hole
20: Dust
100, 200: filter
110, 210: Polymer mesh
112, 124, 212, 214, 215, 216:
120, 220: Polymer web

Claims (11)

A breathable polymer mesh in which monofilaments made of polymer resin are woven in a lattice to form holes of a certain size and arrangement;
A polymer web laminated on at least one of an upper surface and a lower surface of the polymer mesh and having uneven fine holes formed by entanglement of a plurality of polymer fibers; And
And a fluororesin coating layer coated on the entire laminate in which the polymer mesh and the polymer web are laminated,
Wherein the polymer mesh and the polymer web are bonded by the coating to form a monolithic body. A breathable first polymer mesh having monofilaments of a polymer resin woven in a lattice to form holes of a predetermined size and arrangement;
A breathable second polymer mesh laminated on at least one of an upper surface and a lower surface of the first polymer mesh and having monofilaments of a polymer resin woven in a lattice shape to form holes of a predetermined size and arrangement; And
Wherein the first and second polymer meshes are stacked on one another,
Wherein the first and second polymeric meshes are adhered by the coating to form a monolithic structure. The method according to claim 1,
Wherein the thickness of the polymer mesh is greater than the thickness of the polymer web. The method according to claim 1 or 2,
Wherein the monofilament of the polymer mesh is polyester (PET). The method of claim 4,
Wherein the monofilament is coated with a fluorine-containing polymer resin. delete The method of claim 2,
Wherein the monofilaments of the first and second polymer meshes have different diameters and the fluororesin coating layer is formed to have irregular shape and thickness by the different diameters. The method according to claim 1 or 2,
Wherein the fluororesin is PTFE (Polytetrafluoroethylene). The method according to claim 1,
Wherein the fiber is formed by at least one of curing or evaporation of a solvent in which a liquid polymer is injected. The method according to claim 1,
Characterized in that the overlapping fibers in the polymer web are bonded together. The method according to claim 1 or 2,
Wherein the filter is manufactured in a roll state and is cut to a predetermined size by a blade.

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