KR20160082176A - Apparatus and method for manufacturing electret media - Google Patents

Apparatus and method for manufacturing electret media Download PDF

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Publication number
KR20160082176A
KR20160082176A KR1020140195706A KR20140195706A KR20160082176A KR 20160082176 A KR20160082176 A KR 20160082176A KR 1020140195706 A KR1020140195706 A KR 1020140195706A KR 20140195706 A KR20140195706 A KR 20140195706A KR 20160082176 A KR20160082176 A KR 20160082176A
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South Korea
Prior art keywords
polar solvent
filter material
filter
supply container
discharge
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KR1020140195706A
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Korean (ko)
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윤도경
국지훈
정긍식
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도레이케미칼 주식회사
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Publication of KR20160082176A publication Critical patent/KR20160082176A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/02—Loose filtering material, e.g. loose fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/10—Filtering material manufacturing

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  • Chemical Kinetics & Catalysis (AREA)
  • Filtering Materials (AREA)
  • Electrostatic Separation (AREA)

Abstract

Provided is an apparatus for producing electret media. The apparatus for producing the electret media includes: a supply container storing a polar solvent; a discharging part coupled to the supply container so as to discharge the polar solvent; and a moving part moving the media relatively with respect to the discharging part so that the media can be charged as the polar solvent discharged from the discharging part passes through. The discharging part discharges, onto the media, the polar solvent in a uniform amount along a width direction of the media.

Description

[0001] Apparatus and method for manufacturing electret media [0002]

The present invention relates to an electret filter material manufacturing apparatus and a manufacturing method thereof.

An air purifier is provided for filtering and removing various foreign substances contained in the air in various devices such as an internal combustion engine, a gas turbine, an air purifier, and an air conditioner. Various types of filter media are installed as filter media in such an air purifier .

The filter media mounted on the air purifier functions to ensure normal operation of the device and to prolong the life of the device by filtering various foreign substances contained in the air supplied for the operation of the device.

Thus, it is essential that the filter media have both high filtration efficiency and long-term filtration life for effectively collecting foreign matter.

Thus, scientists and engineers have long sought to improve the filtration performance of air filters. On the other hand, some of the most effective air filters use electret products. At this time, the electret product has a permanent or semi-permanent electrical charge.

Electret products, on the other hand, are used in a wide variety of applications, including respirators such as face masks, electronic devices such as household and industrial air conditioners, furnaces, air cleaners, vacuum cleaners, medical wiring filters, It can be used for various filtration applications such as clean system.

Conventional electret filter media manufacturing methods mainly use a method using a high voltage and a method using a contact with a polar solvent. However, the conventional electret filter material manufacturing apparatus is a pressurized spraying technique, and the amount of solvent used is large as the polar solvent is sprayed, and there is a problem in that the surface of the filter material is damaged when sprayed at a certain pressure.

Further, the conventional electret filter material manufacturing apparatus can not individually adjust the suction strength and the flow rate, and thus it is difficult to establish optimal process conditions.

An embodiment of the present invention is to provide an electret filter material manufacturing apparatus and a manufacturing method that can reduce the amount of polar solvent used and can prevent drying of the filter material surface during post-processing.

In addition, an embodiment of the present invention is to provide an apparatus and a method for producing an electret filter material by which electrostatic charge is applied to a filter material to improve trapping ability, thereby easily collecting charged particles.

Also, an embodiment of the present invention is to provide an electret filter material manufacturing apparatus and a manufacturing method which can improve the properties of the filter material and reduce the cost by separately controlling the suction strength and the flow rate of the polar solvent.

According to an aspect of the present invention, there is provided an apparatus for purifying a polar solvent, comprising: a supply container containing a polar solvent; a discharge unit connected to the supply container to discharge the polar solvent; Wherein the discharging portion discharges the polar solvent onto the filter material at a uniform flow rate along the width direction of the filter material.

At this time, one side of the supply container is provided with a discharge port for discharging the polar solvent, and the discharge port is connected to the discharge port so that the polar solvent discharged through the discharge port can be discharged to the filter medium through the discharge port have.

At this time, the discharge port may be located at an upper corner of the one side surface.

At this time, the discharge portion may be arranged to be inclined downward from the discharge port of the supply container.

At this time, the inclined angle of the discharge portion may be 10 degrees to 60 degrees.

At this time, the lower end of the discharge part may be spaced apart from the upper surface of the filter material so that the polar solvent freely falls on the filter material.

At this time, the discharge portion may be formed of a guide member repeatedly formed with the same pattern along the width direction of the filter material.

At this time, the pattern may be formed such that the peak and the valley are alternately formed at equal intervals.

At this time, the cross-sectional shape of the pattern may be any one of a straight line, a prism, a semicircle, a wave pattern, and a polygon.

At this time, the supply container includes a partition wall extending from the upper surface to the lower surface, and a slit extending in the transverse direction may be formed between the partition wall and the lower surface so that the polar solvent can flow.

At this time, a suction unit may be disposed on the lower side of the filter media to suck up the polar solvent moving through the filter media.

At this time, the width of the guide member, the width of the corresponding filter member, and the width of the suction port of the suction unit are the same, and the polar solvent can move from the discharge unit to the suction unit only through the filter member.

The moving unit may include a belt installed on a lower surface of the filter material to support the filter material, and a pair of rollers positioned on both ends of the belt to move the filter material on the belt.

At this time, the belt is porous, and the belt is porous, and the material of the belt is a polyester resin such as polyethylene (PE), polyethylene terephthalate (PET), polyamide, And may be any one of conductive yarns, polyphenylene sulfide (PPS), stainless steel, bronze, and nylon.

In this case, the suction unit may include a blower for discharging the polar solvent sucked into the suction unit to the outside of the suction unit.

The recovery unit may include a solvent storage tank having one end connected to the blower and the other end capable of storing the polar solvent, and a solvent storage tank connected to the suction unit to send the polar solvent to the supply container. And a pump connected at one end to the tank and connected at the other end to the supply container to move the polar solvent stored in the solvent storage tank to the supply container.

At this time, the control unit may control the degree of charging of the filter material by adjusting the suction strength of the suction unit, the flow rate of the polar solvent, and the moving speed of the nonwoven fabric.

At this time, the QF value can be adjusted to 1.0 to 7.0 mmH 2 0 -1 .

At this time, the generated flow rate per the area of the polar solvent can be adjusted to 2 to 6 L / min · cm 2 .

The polar solvent may include water, hydrogen peroxide, alcohols (isopropanol, ethanol, methanol and 2-propanol), ketones (methyl ethyl ketone) ketone, acetone, ethylene, glycol, dimethyl sulfoxide, and dimethylformamide, or a combination thereof.

(B) discharging the polar solvent from the supply vessel at a uniform flow rate along the width direction of the supply vessel; and (c) discharging the polar solvent from the supply vessel at a uniform flow rate. According to another aspect of the present invention, And arranging a filter medium on a path through which the discharged polar solvent moves, thereby causing the polar solvent to pass through the filter medium, thereby generating a static charge on the filter medium.

At this time, in the step (b), the polar solvent may be allowed to freely fall on the filter medium after passing through the discharge part disposed downwardly inclined from the discharge port of the supply container.

At this time, in the step (c), an inlet port may be disposed on the lower side of the filter medium, and the polar solvent may be sucked into the inlet port.

At this time, after step (c), (d) recovering the polar solvent may be included.

The electret filter material manufacturing method and apparatus according to an embodiment of the present invention can produce an electret filter material capable of collecting charged particles easily by improving the collection ability by applying static electricity to the filter material.

In addition, the electret filter material manufacturing apparatus and method according to an embodiment of the present invention can reduce the amount of the solvent used in comparison with the same physical property by free dropping the polar solvent at a uniform flow rate, and can increase the efficiency of the subsequent drying process The surface of the filter material can be prevented from being damaged.

1 is a perspective view illustrating an electret manufacturing apparatus according to an embodiment of the present invention.
2 is a cross-sectional view schematically illustrating operation of an electret manufacturing apparatus according to an embodiment of the present invention.
3 to 5 are schematic views showing various pattern shapes of a guide member of an electret manufacturing apparatus according to an embodiment of the present invention.
6 is a schematic view schematically showing a suction unit and a recovery unit of an electret manufacturing apparatus according to an embodiment of the present invention.
7 is a flowchart illustrating an electret manufacturing method according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

In this specification, the terms "comprises" or "having" and the like refer to the presence of stated features, integers, steps, operations, elements, components, or combinations thereof, But do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. Also, where a section such as a layer, a film, an area, a plate, or the like is referred to as being "on" another section, it includes not only the case where it is "directly on" another part but also the case where there is another part in between. On the contrary, where a section such as a layer, a film, an area, a plate, etc. is referred to as being "under" another section, this includes not only the case where the section is "directly underneath"

Hereinafter, an apparatus and a method for manufacturing an electret filter medium according to an embodiment of the present invention will be described in detail with reference to the drawings.

1 is a perspective view illustrating an electret manufacturing apparatus according to an embodiment of the present invention. 2 is a cross-sectional view schematically illustrating operation of an electret manufacturing apparatus according to an embodiment of the present invention.

Referring to FIG. 1, an apparatus for manufacturing an electret filter material 1 according to an embodiment of the present invention may include a supply container 10, a discharge portion 30, a moving portion 50, and a suction portion 70 have. Accordingly, the electret filter material manufacturing apparatus 1 according to an embodiment of the present invention can easily collect the charged particles by improving the trapping ability of the filter material by applying the static electricity to the filter material 5.

Further, the electret filter material manufacturing apparatus 1 according to the embodiment of the present invention can reduce the amount of solvent used in comparison with the same physical property by lowering the polar solvent 3 at a uniform flow rate, and increase the efficiency of the subsequent drying process And the surface of the filter material 5 can be prevented from being damaged.

On the other hand, the polar solvent 3 for applying the static electricity to the filter medium 5 may be water. Water is cheap and dangerous or harmful vapors are not generated when contacted with other materials.

Referring to FIG. 1, in an embodiment of the present invention, the supply vessel 10 may have a hollow portion therein to store the polar solvent 3. [ 2, an inlet 12a is formed in the upper edge of the left side of the supply container 10 so that the polar solvent 3 flows into the supply container 10 But the position of the inlet is not limited thereto.

At this time, the flow rate of the polar solvent passing through the filter medium 5 can be adjusted by controlling the flow rate of the polar solvent 3 flowing into the supply vessel 10 through the inlet 12a. This can reduce the amount of solvent used for the same property and increase the efficiency of the subsequent drying process.

2, a discharge port 12b is formed at an upper corner of the right side surface of the supply container 10 to discharge the polar solvent 3 to the discharge portion 30, But the position of the discharge port is not limited thereto.

When the polar solvent 3 flows through the inlet 12a of the supply vessel 10, the height of the water surface of the polar solvent 3 filled in the supply vessel becomes higher than the height of the discharge port 12b, The solvent 3 overflows to the discharge portion 30 through the discharge port.

Referring to FIGS. 1 and 2, the supply vessel 10 may include a first partition 13 and a second partition 15 extending from the upper surface 10a to the lower surface 10b. The partition walls 13 and 15 partition the inner space of the supply container 10 to form a flow path so that the polar solvent 3 moves to the discharge port 12b.

The first bank 13 extends from the upper surface 10a to the lower surface 10b and is provided between the first bank and the lower surface with a first slit 13a extending in the transverse direction so that the polar solvent 3 can flow. May be formed.

The second partition 15 is formed to extend from the lower surface 10b to the upper surface 10a and a second slit extending in the transverse direction so that the polar solvent 3 can flow between the second partition and the upper surface 15a may be formed.

Referring to FIG. 2, a plurality of barrier ribs may be formed, and a plurality of barrier ribs may be alternately formed. However, the shape of the partition wall disposed at the position closest to the discharge port may vary depending on the position of the discharge port 12b.

2, when the discharge port 12b is formed in the upper corner of the right side of the supply vessel 10, the polar solvent 3 must be formed to rise from the bottom to the top. In this case, The first barrier rib 13 may be included.

Referring to FIGS. 1 and 2, the discharge unit 30 may include a guide member 31 in one embodiment of the present invention. The discharge portion 30 is connected to the discharge port 12b of the supply container 10 so that the polar solvent 3 overflowed from the supply container through the discharge port is discharged onto the filter material 5 through the discharge portion.

2, one end of the discharge part 30, for example, the left end, that is, the upper end may be connected to the discharge port 12b of the supply container 10 and arranged to be inclined downward from the discharge port. At this time, the inclined angle? Of the discharge portion 30 may be 10 to 60 degrees, but is not limited thereto.

The lower end of the discharge portion 30 is spaced apart from the upper surface of the filter material 5 so that the polar solvent freely falls on the filter material. At this time, the distance L1 between the lower end of the discharge portion 30 and the upper surface of the filter material 5 may be 5 mm to 50 mm, but is not limited thereto. If the distance L1 is too far away, the uniformity of the filter medium may be deteriorated according to the suction gradient.

3 to 5 are schematic views showing various pattern shapes of a guide member of an electret manufacturing apparatus according to an embodiment of the present invention.

1 and 3 to 5, the discharge unit 30 may include a guide member 31 having the same pattern repeatedly formed along the width direction W2 of the filter material 5. [

The guide member 31 allows the polar solvent 3 overflowing from the supply container 10 to be discharged onto the filter medium. At this time, in the polar solvent 3, a uniform flow rate is discharged along the width direction of the filter medium 5.

In this case, polar solvents are polar solvents such as water, hydrogen peroxide, alcohols (isopropanol, ethanol, methanol and 2-propanol), ketones (methyl ethyl ketone ethyl ketone, acetone, ethylene glycol, dimethyl sulfoxide and dimethylformamide, or a combination of these.

3 to 5, the pattern 33 may be formed such that the peak portions 33a, 33a ', 33a "and the valleys 33b, 33b', 33b" are alternately formed at equal intervals. At this time, the pattern 33 may be any one of the straight lines 33a and 33b, the semicircles 33a 'and 33b', the wavy patterns 33a 'and 33b', and the polygon. However, since these patterns 33 have the same cross-sectional shape, the polar solvent 3 discharged along the pattern is discharged at a uniform flow rate.

3 to 5, the pattern 33 has a pitch W4 which is the interval between the peak portions 33a, 33a ', 33a "and the peak portions or between the valleys 33b, 33b', 33b" And the height (h) from the valley to the mountain can be controlled to control the flow rate of the polar solvent 3 passing through the pattern 33. [

1 and 2, the suction unit 70 may be disposed on the lower side of the filter material 5 to suck the polar solvent 3 that has passed through the filter material 5. [ 2, the suction unit 70 may include a suction chamber 71 and an air inlet (not shown).

The suction chamber 71 is formed with a suction port 72 on the upper side to suck the polar solvent 3 through the suction port. In addition, the inlet port is provided inside the suction chamber 71 to allow the polar solvent 3 to flow into the suction chamber.

1, in order to allow the polar solvent 3 to move from the discharge portion 30 to the suction portion 70 only through the filter media 5, the width W1 of the guide member 31 The width W2 of the corresponding filter medium and the width W3 of the suction port 72 may be the same.

6 is a schematic view schematically showing a suction unit and a recovery unit of an electret manufacturing apparatus according to an embodiment of the present invention.

Referring to FIG. 6, in an embodiment of the present invention, in order to suck the polar solvent through the suction port 73, the suction unit 70 is in a state of a negative pressure lower than the atmospheric pressure so that the polar solvent flows into the suction chamber do. At this time, the air inlet may be a blower, but is not limited thereto.

When the polar solvent is contacted with the filter material 5 through the suction unit 70 and the filter material is charged, the inside of the filter material can be easily charged and the surface of the filter material can be prevented from being damaged by the polar solvent.

6, the polar solvent sucked into the suction unit 70 is transferred to the recovery unit 90, and the air is discharged to the atmosphere. At this time, the recovery unit 90 may include a solvent recovery unit 91, a solvent storage tank 93, and a pump 95.

Referring to FIG. 6, the recovery unit 90 may reduce the amount of the polar solvent by moving the inhaled polar solvent to the supply container without discharging it.

On the other hand, the solvent recovery device 91 has one end connected to the inlet port 73 and the other end connected to the solvent storage tank 93 to move the polar solvent sucked through the inlet port to the solvent storage tank.

In addition, the pump 95 is connected to the solvent storage tank 93 at one end and connected to the supply vessel 10 at the other end, and the polar solvent stored in the solvent storage tank is transferred to the supply vessel to circulate the polar solvent. This makes it possible to reduce the amount of the polar solvent (5) used.

At this time, the amount of the polar solvent to be transferred to the supply vessel 10 can be adjusted by controlling the pressure of the pump 95, and when a large amount of polar solvent is transferred to the pump, the solvent is returned to the solvent storage tank 93 again.

2, the moving unit 50 includes a belt 51, a pair of rollers 53, a driving motor (not shown), and a storage roller 55, The polar solvent can be passed through the filter medium (5).

On the other hand, the belt 51 is provided on the lower surface of the filter material 5 and can support the filter material. Further, the pair of rollers 53 can be positioned on both end sides of the belt 51 to move the filter material 5 on the belt.

In this embodiment, as shown in FIGS. 1 and 2, the belt is rotated using four rollers, and the suction unit 70 is positioned inside the belt. However, only the suction port of the suction unit And the rest of the configuration may be located outside the belt.

In this case, it is possible to move the belt by using two rollers instead of four rollers as in this embodiment. The driving motor can rotate the pair of rollers 53 to move the belt. At this time, the moving speed of the belt may be 10 m / min.

Further, the belt 51 can move continuously around the endless path so that the filter material 5 can be continuously produced. At this time, the belt is made of a polyester resin such as polyethylene (PE), polyethylene terephthalate (PET), polyamide, conductive yarns, polyphenylene sulfide (PPS) stainless steel, bronze, and nylon.

On the other hand, since the polar solvent moves through the belt 51 supporting the filter media 5 to the suction unit 70, the belt may be a porous material having fine holes and uniform distribution.

Referring to FIG. 2, the storage roller 55 is connected to one end of the filter material 5, for example, the right end of the filter material 5, so that the filter material to which the static charge is applied can be wound around and easily stored.

Meanwhile, the apparatus for manufacturing electret material according to an embodiment of the present invention may include a controller (not shown). At this time, the controller can adjust the suction strength (%) of the suction portion, the supply flow rate (l / min) of the polar solvent, and the moving speed (m / min) of the nonwoven fabric to control the degree of charging of the filter media.

Figure pat00001

Where R is the collection efficiency and? P is the differential pressure.

The QF value is an abbreviation of quality factor. The QF value includes the pressure loss and the removal rate expressing the performance of the air filter. The larger the QF value, the better the performance of the filter.

If the QF value of the air filter having the same removal efficiency is higher, the lower the pressure loss value, and the higher the QF value of the air filter having the same pressure loss value, the higher the removal efficiency.

One QF value in the embodiment of the present invention is 1.0 mmH 2 0 - may be greater than or equal to 1. If the QF value is less than 1.0 mmH 2 0 - 1, it means that the performance such as pressure loss and removal efficiency of the filter medium is deteriorated.

Therefore, the air filter of the present invention must satisfy the removal efficiency, that is, the collection efficiency is 80% or more. Also, the QF value should satisfy 1.0 mmH 2 0 - 1 or more. As a result, it is possible to improve the collecting efficiency relative to the pressure loss and achieve the energy efficiency of the filter with the same collecting efficiency.

Meanwhile, in order to adjust the QF value to 1.0 to 7.0 mmH 2 0 -1 , the controller controls the suction strength of the suction part to 60 to 100% and the flow rate of the polar solvent to 2.0 to 6.0 L / min · cm 2 , The speed can be adjusted from 5 to 15 m / min.

On the other hand, the filter material (5) uses a large amount of nonwoven fabric. Therefore, when the mist particles pass through the filter medium, the filter material is forced to have a polarized electric charge. Thus, the filter material having a polarized electric charge has fine particles .

The filter material 5 applicable to the present invention is not limited as long as it is a commonly used nonwoven fabric and may be a dry nonwoven fabric, a spunlaced nonwoven fabric, a spunbond nonwoven fabric, a melt blown nonwoven fabric, a needle punch nonwoven fabric or a stitch- And can be produced by a conventional nonwoven fabric manufacturing method.

In one embodiment of the present invention, the material of the nonwoven fabric may be a thermoplastic polymer resin, and the thermoplastic polymer may be an alpha-olefin such as ethylene, propylene, 1-butene, 1-hexene, (Low density polyethylene (LLDPE), high density polyethylene (HDPE), polypropylene (propylene homopolymer), polypropylene random copolymer, poly 1-butene, poly 4-methyl-1-pentene (Polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, etc.) such as ethylene-propylene random copolymer, ethylene 1-butene random copolymer and propylene 1-butene random copolymer, polyamide (nylon- 6, nylon-66, polymethoxyl adipamide and the like), polyvinyl chloride, ethylene-vinyl acetate copolymer, ethylene-vinyl acetate-vinyl alcohol copolymer (Meth) acrylic acid copolymer, an ethylene-acrylic ester-carbon monoxide copolymer, a polyacronitrile, a polycarbonate, a polystyrene, an ionomer (a copolymer of ethylene and methyl acrylate) Na), calcium (Ca) ammonium (NH4), etc.), or a mixture of two or more thereof, more preferably selected from the group consisting of nylon, polyester, polyurethane, Nitrile, polyolefin, and cellulose.

The resin is poly [[6- (1,1,3,3-tetramethylbutyl) amino] -s-triazine-2,4-diyl] as a charge agent to a polypropylene polymer resin having a melt index of 1300 g / - [[(2,2,6,6-tetramethyl-4-piperidyl) imino] hexamethylene [(2,2,6,6-tetramethyl-4-piperidyl) imino] (Chima Sob 911, Shiba Geiger) 0.5% by weight was master batch processed and mixed.

The spinning composition is sprayed with a single spinning melt blown and processed into a meltblown nonwoven fabric.

1. Measurement of collection efficiency and pressure loss

It was measured according to the air filter measurement method generally used. Specifically, an aerosol containing sodium chloride was passed through a nonwoven fabric sample at an air flow rate of 32 LPM (linear velocity: 5.33 cm / sec), and the number of sodium chloride particles before and after the passage was measured, And then divided by the number of sodium chloride particles before passing through it. At this time, the aerosol was prepared by dissolving sodium chloride in distilled water to make an aqueous solution of 2 wt% sodium chloride, and then vaporizing water by a heater to make sodium chloride to have a size of about 0.3 탆.

The collection efficiency (%) of the particles in this way was measured by an automated efficiency tester (TSI, Model 8130). The pressure loss (mmH 2 O) was measured from the pressure loss before and after the passage of the nonwoven fabric at the air flow rate of 32 LPM (linear velocity: 5.33 cm / s) while measuring the collection efficiency.

2. Measurement of QF value (mmH 2 0 -1 )

The QF value is a kind of means for expressing filter performance combining filtration efficiency and pressure loss. Generally, the QF value is calculated according to Equation 1, and the higher the value, the better the air filter performance.

7 is a flowchart illustrating an electret manufacturing method according to an embodiment of the present invention.

Referring to FIG. 7, the method for manufacturing an electret filter material according to another embodiment of the present invention includes the steps of supplying a polar solvent to a supply container (S10), supplying a polar solvent from the supply container along a width direction of the supply container at a uniform flow rate And discharging the polar solvent through the filter medium by arranging the filter medium on the path through which the discharged polar solvent moves, thereby generating a static charge on the filter medium (S30).

Through this, the polar solvent (3) is passed through the filter material (5) to provide static electricity to improve the collection ability and to produce an electret filter material in which the surface of the filter material is not damaged when the polar solvent passes through the filter material.

Referring to FIG. 7, in a step S10 of supplying a polar solvent to a supply container, a polar solvent 3 necessary for applying a static charge to the filter medium 5 is supplied to the supply container 10.

At this time, the flow rate of the polar solvent passing through the filter medium 5 can be adjusted by controlling the flow rate of the polar solvent 3 flowing into the supply vessel 10 through the inlet 12a.

1, in the step S20 of discharging the polar solvent from the supply container along the width direction of the supply container at a uniform flow rate, the width direction of the supply container 10, that is, the width W1 of the guide member 31 ) Direction, the polar solvent is discharged from the supply container at a uniform flow rate using a guide member.

The same pattern 33 may be repeatedly formed in the guide member along the width direction of the filter media in order to discharge the uniform flow rate of the polar solvent 3 using the guide member 31 onto the filter media 5. [

At this time, the pattern 33 may be formed such that the peak 33a and the valley 33b are alternately formed at equal intervals, and the cross-sectional shape of the pattern may be any of a straight line, a prism, a semicircle, a wave pattern and a polygon.

The polar solvent 3 having the same cross-sectional area as that of the crests 33a and the valleys 33b of the pattern 33 is discharged through the guide members 31 along the width direction of the filter media 5 .

In step S20, in which the polar solvent is discharged at a uniform flow rate from the supply vessel along the width direction of the supply vessel, the polar solvent 3 is discharged from the discharge port 12b of the supply vessel 10 30 to allow the polar solvent 3 to freely fall onto the filter material 5 to prevent the surface of the filter material from being damaged when the polar solvent is discharged onto the filter material.

Referring to FIG. 7, in step S30 in which static electricity is generated on the filter medium by arranging the filter medium on the path through which the discharged polar solvent moves, the filter medium 5 is wound around the belt 51 and the belt is moved so that the filter medium is disposed on the movement path through which the polar solvent 3 is discharged to allow the polar solvent to pass on the filter medium.

Further, an air inlet may be disposed on the lower side of the filter medium 5 to suck the polar solvent 3 through the air inlet. At this time, depending on the suction strength of the suction port, the amount of static charge generated in the filter material 5 may be varied. This is related to the performance of filter media (5).

On the other hand, after the step S30 of generating static electricity on the filter media by arranging the filter medium on the path through which the discharged polar solvent moves, the polar solvent is recovered (S40 ).

In step S40 of recovering the polarized solvent inhaled, the polar solvent 3 sucked into the suction unit 70 is moved to the solvent storage tank 93 through the solvent recovery unit 91, To the supply container 10 and circulated. At this time, the pressure of the pump 95 may be adjusted to adjust the amount of the polar solvent 3 that is transferred to the supply vessel 10. Accordingly, the method of manufacturing an electret filter material according to an embodiment of the present invention can reduce the amount of solvent used in comparison with the same physical property.

On the other hand, in one embodiment of the present invention, the filter material (5) can be used for a filter with a nonconductive polymer. At this time, the nonwoven fabric is often used as the filter material (5).

The nonconductive material has a volume resistivity of more than about 10 < 14 > ohm-cm at room temperature (22 DEG C), and the nonconductive polymer is a material suitable for producing a usable material.

In addition, the polymer may be a synthetic organic macromolecule essentially comprising a monolithic long chain structural unit prepared as a plurality of monomers. Polymers used to produce filter media (5) should be able to retain large amounts of trapped charge.

While the polymer includes polyolefins, polypropylene, poly-4-methyl-1-pentene, blends or copolymers containing one or more polymers, and mixtures of these polymers.

Other polymers include polyethylene, other polyolefins, polyvinyl chloride, polystyrene, polycarbonate, polyethylene terephthalate, other polyesters, and mixtures of these polymers and other nonconductive polymers.

Figure pat00002

Table 1 shows that as the suction strength of the polar solvent increases as the effect of the suction strength, the removal rate and the QF value are increased. It also shows that the removal rate and the QF value are increased rather than causing no occurrence of the suction strength.

When the suction strength is weak, the polar solvent (3) and the filter material (5) do not sufficiently collide with each other and the physical properties thereof deteriorate. If the suction strength is too strong, the charging of the filter material may be reduced due to the collision between the polar solvent and the filter material .

Figure pat00003

Table 2 shows that as the effect of the supply amount of the polar solvent per reference area, the QF value increases as the supply amount of the polar solvent increases.

Figure pat00004

Table 3 shows that the QF value increases when the moving speed of the nonwoven fabric is 10 m / min as an effect of the moving speed of the nonwoven fabric.

Figure pat00005

Table 4 shows that the QF value increases as the pressure loss of the filter medium (5) decreases under the same charging condition as the change in the QF value due to the filter media pressure.

The apparatus and method for producing an electret filter material according to an embodiment of the present invention can prevent the surface of the filter material from being damaged when the polar solvent is passed through the filter material 5 by freely dropping the polar solvent 3, It is possible to reduce the amount of solvent used for the same property,

In addition, the electret filter material manufacturing method and manufacturing method according to one embodiment of the present invention can improve the physical properties and cost of the filter material 5 by separately controlling the suction strength and the flow rate of the polar solvent.

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, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

1: electret filter material manufacturing apparatus 3: polar solvent
5: filter media 10: supply container
10a: upper surface 10b: lower surface
12a: Inlet port 12b: Outlet port
13: first partition 13a: first slit
15: second partition 15a: second slit
30: discharge part 31: guide member
33: pattern 33a:
33b: valley 50: moving part
51: Belt 53: A pair of rollers
55: Storage roller 70: Suction part
71: Suction chamber 72: Suction chamber
73: inlet port 90:
91: Solvent storage tank 93: Solvent recovery tank
95: Pump

Claims (24)

A supply container storing a polar solvent;
A discharge unit connected to the supply container and discharging the polar solvent; And
And a moving unit relatively moving the filter material to the discharge unit so that the polar solvent discharged from the discharge unit passes and the filter material is charged,
And the discharging portion discharges the polar solvent onto the filter material at a uniform flow rate along the width direction of the filter material. The method according to claim 1,
And a discharge port for discharging the polar solvent is provided on one side of the supply container,
Wherein the discharging portion is connected to the discharging port so that the polar solvent discharged through the discharging port passes through the discharging portion and is discharged onto the filter material. The method according to claim 1,
And the outlet is positioned at an upper corner of the one side surface. The method according to claim 1,
And the discharge portion is disposed downwardly inclined from the discharge port of the supply container. 5. The method of claim 4,
Wherein the inclined angle of the discharge portion is in the range of 10 to 60 degrees. 5. The method of claim 4,
And the lower end of the discharge portion is spaced apart from the upper surface of the filter material so that the polar solvent freely falls on the filter material. The method according to claim 1,
The outlet
And a guide member repeatedly formed with the same pattern repeatedly along the width direction of the filter medium. 8. The method of claim 7,
Wherein the pattern is formed such that the crests and the valleys are alternately formed at equal intervals. 9. The method of claim 8,
Wherein the pattern is one of a straight line, a prism, a semicircle, a wavy pattern, and a polygon in cross-sectional shape. The method according to claim 1,
Wherein the supply container includes a partition wall extending from an upper surface to a lower surface, wherein a slit extending in a transverse direction is formed between the partition wall and the lower surface so that the polar solvent can flow. The method according to claim 1,
And a suction unit located at a lower side of the filter medium and sucking the polar solvent moving through the filter medium. 12. The method of claim 11,
The width of the filter member corresponding to the width of the guide member and the width of the suction port of the suction unit are the same so that the polar solvent moves from the discharge unit to the suction unit only through the filter member. The method according to claim 1,
The moving unit
A belt provided on a lower surface of the filter media for supporting the filter media,
And a pair of rollers located on both end sides of the belt for moving the filter material on the belt. 13. The method of claim 12,
The belt is porous and the material of the belt is selected from the group consisting of polyester resin such as polyethylene (PE), polyethylene terephthalate (PET), polyamide, conductive yarns, polyphenylene Wherein the electret filter material is one of sulfide (PPS), stainless steel, bronze, and nylon. 11. The method of claim 10,
Wherein the suction unit includes a blower for discharging the polar solvent sucked into the suction unit to the outside of the suction unit. 12. The method of claim 11,
And a recovery unit connected to the suction unit for sending the sucked polar solvent to the supply container,
The collecting unit
A solvent storage tank having one end connected to the blower and the other end capable of storing the polar solvent; And
And a pump connected at one end to the solvent storage tank and connected at the other end to the supply container to move the polar solvent stored in the solvent storage tank to the supply container. The method according to claim 1 or 11,
And a control unit for adjusting the degree of charging of the upper storage roll by adjusting the suction strength of the suction unit, the supply flow rate of the polar solvent, and the moving speed of the nonwoven fabric. 18. The method of claim 17,
And the QF value is adjusted to 1.0 to 7.0 mmH 2 0 -1 . 18. The method of claim 17,
And the generated flow rate per area of the polar solvent is adjusted to 2 to 6 L / min · cm 2 . The method according to claim 1,
The polar solvent may be a polar solvent such as water, hydrogen peroxide, alcohols (isopropanol, ethanol, methanol and 2-propanol), ketones (methyl ethyl ketone ethyl ketone, acetone), ethylene, glycol, dimethyl sulfoxide, and dimethylformamide, or a combination thereof. . (a) supplying a polar solvent to a supply vessel;
(b) discharging the polar solvent from the supply vessel at a uniform flow rate along the width direction of the supply vessel; And
(c) disposing a filter medium on a path through which the discharged polar solvent moves, passing the polar solvent through the filter medium, thereby generating a static charge on the filter medium; ≪ / RTI > 22. The method of claim 21,
Wherein the polar solvent allows the polar solvent to freely fall on the filter medium after passing through a discharge part disposed downwardly inclined from the discharge port of the supply container. 22. The method of claim 21,
In the step (c)
And an inlet port is disposed at the lower side of the filter medium, and the polar solvent is sucked into the inlet port. 22. The method of claim 21,
After the step (c)
(d) recovering the polar solvent.
KR1020140195706A 2014-12-31 2014-12-31 Apparatus and method for manufacturing electret media KR20160082176A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190053959A (en) * 2016-09-30 2019-05-20 타피러스 컴퍼니 리미티드 Electret article manufacturing apparatus and charging method of nonconductive sheet
KR102186039B1 (en) * 2019-11-20 2020-12-03 재단법인 한국탄소융합기술원 Method for manufacturing high conductive carbon fiber composite

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190053959A (en) * 2016-09-30 2019-05-20 타피러스 컴퍼니 리미티드 Electret article manufacturing apparatus and charging method of nonconductive sheet
KR102186039B1 (en) * 2019-11-20 2020-12-03 재단법인 한국탄소융합기술원 Method for manufacturing high conductive carbon fiber composite

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