KR101530666B1 - Micro filter and manufacture method thereof - Google Patents

Abstract

The present invention relates to a microfiltration apparatus and a method of manufacturing the same, and more particularly, to a microfiltration apparatus and a method of manufacturing the same, in which a filter medium, which is formed into a cylindrical shape by bending a polyvinylidene difluoride nanofiber material and a space in which the filter medium is accommodated, And a capsule-type microfiltration apparatus using the filter material of the PVDF nanofiber material can be produced to remove the solid particles having a size of 1 占 퐉 or less contained in the filtration liquid.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microfilter,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microfiltration apparatus and a method of manufacturing the same, and more particularly, to a microfiltration apparatus for removing solid particles of 1 μm or less using nanofibers and a method of manufacturing the same.

Generally, a filter is used for filtration of impurities contained in liquid or gaseous fluid or various contaminants harmful to human body, and is used in various fields such as daily life, factory, and workplace.

As the industry becomes complex, specialized and refined, it is inevitable to improve the function of filters such as selective filtration technology in all industries, and it is required to develop a new type of filter that combines economy and efficiency in the field of fine filtration (MF).

Generally, a filter material such as a polymer membrane, a melt-blown nonwoven fabric, other nonwoven fabric, or glass fiber is used for microfiltration.

In the case of a polymer membrane, the price is high, and when the object to be treated has a high viscosity and a high concentration, clogging occurs instantaneously, there is a disadvantage that the object to be used is limited.

The melt blown nonwoven fabric is advantageous in that it is less expensive than the polymer separator, but has a disadvantage that the removal performance is markedly limited.

Glass fiber is known as an excellent material to remove, but it has a disadvantage in that it has a limitation in removal efficiency because it is accompanied with the risk of breaking due to the nature of the glass material.

For example, the following Patent Document 1 discloses a technology relating to a manufacturing method of a multifunctional composite filter.

Patent Document 1 discloses a two-component composite spinning fiber comprising a first thermoplastic polymer having a predetermined melting point and a second thermoplastic polymer having a melting point lower than that of the first thermoplastic polymer or a high melting point staple fiber composed of a first thermoplastic polymer and a second thermoplastic polymer A step of preparing a heat-sealable nonwoven fabric support made of mixed short fibers having low melting point short fibers mixed with the low melting point short fibers, a first heat-sealable web composed of short fibers or mixed short fibers made of composite spinning fibers on the upper surface of the non- A step of laminating deodorant powders on the top surface of the heat-sealable first web, a step of laminating a second heat-sealable web composed of short fibers or mixed short fibers made of composite spinning fibers on the top surface of the deodorized powders dispersed And heat-treating the second thermoplastic polymer component of the laminate to melt the laminate, thereby integrating the laminate.

Korean Patent Registration No. 10-0888276 (published on March 11, 2009)

However, in the conventional filter manufacturing method including Patent Document 1, the filter medium is deformed by heating by heating the filter medium by using the hot melt adhesive method or the ultrasonic adhesive method.

Therefore, the filter manufacturing method according to the related art has a problem that the filter medium is damaged due to the deformation of the filter medium due to heat, and morphology deformation of the filtration film occurs.

In the filter manufacturing method according to the related art, there is a problem that the filtration membrane is contaminated by the polypropylene resin as the filtration membrane and the end cap are bonded by the injection method.

Disclosure of the Invention An object of the present invention is to provide a microfiltration device capable of removing solid particles of 1 탆 or less by using polyvinylidene difluoride nanofibers, .

Another object of the present invention is to provide a microfiltration apparatus capable of minimizing the deformation of the filter medium due to heat during the molding of the filter medium, and a method of manufacturing the same.

It is still another object of the present invention to provide a microfiltration apparatus and a method of manufacturing the microfiltration apparatus, which can prevent contamination of a filter medium in the process of manufacturing a capsule-type microfiltration apparatus, and improve convenience and stability of a manufacturing operation.

According to an aspect of the present invention, there is provided a microfiltration apparatus comprising: a filter material formed by bending a polyvinylidene difluoride nanofiber material into a cylindrical shape; And a case part provided with a space to be accommodated.

The case includes a case formed with a nozzle at an upper portion thereof, a case formed into a cylindrical shape with a space for accommodating the filter medium therein, and an end cap coupled to a lower end of the case, Radiant heat is generated by using a high-capacity heater and is directly melted and then bonded.

The present invention further includes a housing part having an inlet port through which the filtration fluid to be filtered flows and a discharge port through which the filtrate filtered by the filter medium is formed, the housing part shielding the outside of the case part, The upper cap which shields the upper surface of the housing and forms the inlet and the outlet, and the upper cap which is formed on the basis of the inflow flow rate of the filtration fluid so as to keep the inflow pressure of the filtration fluid constant. A first valve assembly for opening and closing the inlet port, and a second valve assembly for opening and closing the outlet port.

The first valve assembly is provided with a check valve including a plate spring elastically deformed according to an inflow pressure of the filtration fluid and a damper for opening or closing the inflow port according to elastic deformation of the leaf spring.

The second valve assembly includes a valve body installed at the discharge port, a ring spring whose one end is coupled to a nozzle provided at an upper portion of the case, and a valve body integrally coupled to a distal end of the ring spring, And a check valve is provided.

According to another aspect of the present invention, there is provided a method for fabricating a microfiltration device, comprising: (a) bending a nanofiber material to produce a filter material in a cylindrical shape; (b) And (c) joining the case of the case portion in which the filter medium is accommodated and the end cap, wherein the nanofiber material is formed of polyvinylidene difluoride nanofiber material.

(D) The step (d) further comprises the step of joining the housing of the housing part in which the case part is received and the upper cap, thereby manufacturing a capsule-type microfiltration device.

The step (a) comprises the steps of (a1) calendering the nanofiber material so that the thickness and the pore become constant, and (a2) bending the nanofiber material in a W-shaped manner to form a filter material in the form of a cylindrical wrinkle filter The method comprising the steps of:

In the step (b), both ends of the filter material are sealed by using an impulse adhesion method using heat by an impact current, and the impact current exposure time is set to 0.3 to 1.5 seconds.

In the step (c), radiant heat of 300 to 500 ° C generated in the heater is applied to the case and the end cap for 5 to 20 seconds to melt and bond the joint part of the case and the end cap to manufacture a cartridge- .

(D1) assembling a first valve assembly that opens and closes an inlet port on a lower surface of the upper cap and a second valve assembly that opens and closes an exhaust hole, and (d2) And then radiating heat at 200 to 500 DEG C for 3 to 10 seconds to melt and join the joint portion of the upper cap and the housing.

As described above, according to the microfiltration apparatus and the manufacturing method thereof according to the present invention, a capsule-type microfiltration apparatus using a filter material of PVDF nanofiber material is manufactured, and solid particles of 1 μm or less contained in the filtrate are removed Can be obtained.

Particularly, according to the microfiltration apparatus and the manufacturing method thereof according to the present invention, the PVDF nanofiber material having a certain thickness and pore size can be used to obtain a precise filtration performance.

According to the microfiltration apparatus and the method of manufacturing the same according to the present invention, the both ends of the cylindrical filter material are impulse-current-welded to seal instantaneously using impact current.

Accordingly, the microfiltration apparatus and the method of manufacturing the same according to the present invention solve the problem that the structure of the filtration membrane is finely changed by the heat during the sealing process by the conventional ultrasonic bonding method or hot melt bonding method, the morphology distortion can be minimized.

Further, according to the microfiltration apparatus and the manufacturing method thereof according to the present invention, it is possible to prevent contamination of the filter medium in the process of manufacturing a capsule-type microfiltration apparatus, and to improve the convenience and stability of the manufacturing operation.

Further, according to the microfiltration apparatus and the manufacturing method thereof according to the present invention, the durability of the filter medium is improved, and even when the filtration time has elapsed, uniform filtration performance can be obtained.

1 is a perspective view of a microfiltration apparatus according to a preferred embodiment of the present invention,
FIG. 2 is an exploded perspective view of the microfiltration apparatus shown in FIG. 1,
Fig. 3 is an enlarged view showing a post-calendering state of a conventional filter material composed of micro fibers,
4 and 5 are an enlarged view and a cross-sectional view showing the state after calendering of the nanofiber filter media,
6 and 7 are diagrams showing the porosity of the conventional filter material made of microfibers and the filter material made of the nanofibers according to the present embodiment,
8 is a graph showing the pore distribution of the conventional microfibers and the PVDF nanofibers according to the present embodiment,
9 is a graph showing the results of repeated experiments on the pore distribution of the conventional microfibers and the PVDF nanofibers according to the present embodiment,
FIG. 10 is a process diagram for explaining steps of a method for manufacturing a microfiltration apparatus according to a preferred embodiment of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a microfiltration apparatus and a method of manufacturing the same according to preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a perspective view of a microfiltration apparatus according to a preferred embodiment of the present invention, and FIG. 2 is an exploded perspective view of the microfiltration apparatus shown in FIG. 1.

1 and 2, a microfiltration apparatus according to a preferred embodiment of the present invention includes a filter medium 10 formed into a cylindrical shape by bending a nanofiber material, and a filter medium 10 And a case part 20 provided with a space to be accommodated.

In addition, the microfiltration apparatus according to the preferred embodiment of the present invention includes an inlet 31 through which the entire filtrate to be filtered is shielded and a filtrate filtered by the filter medium 10, And a housing part (30) in which an outlet (32) is formed.

That is, in the present embodiment, the microfiltration apparatus may be formed in the form of a cartridge filter composed of the filtration part 10 and the case part 20, and may be manufactured in the form of a capsule filter further including the housing part 30 .

The filter material 10 may be a pleated filter having a cylindrical shape formed by bending the nanofiber material into a W shape in order to maximize the contact area with the filtration liquid under the same conditions.

Support members (not shown) may be provided on the inside and outside of the filter medium 10 to prevent the filter medium 10 from being deformed.

The support member may be made of a polypropylene (PP) material, and may be formed in a mesh structure so that the filtration liquid or the filtrate can be easily moved.

Such a support member secures a space between the process water and the filter material, forms a flow path through which the process water can flow to each layer, and distributes the process water evenly.

In addition, the support member functions to prevent the formation of a cake in each layer and to buffer the filter medium to prevent damage to the filter medium when excessively high-pressure treatment water is introduced.

Both ends of the filter element 10 are sealed by impulse current welding using instantaneous heat using an impact current.

Accordingly, the present invention can solve the problem that the structure of the filtration membrane is finely changed by the heat during the sealing process by the conventional ultrasonic bonding method or the hot melt bonding method, and morphology deformation of the filtration membrane can be minimized.

Nanofibers are ultra-fine yarns with diameters ranging from tens to hundreds of nanometers (nm), and can be fabricated by electrospinning.

As described above, the present invention improves the problems of existing membrane separators (membranes) produced by phase-switching or biaxial stretching by using nanofiber materials as filter media, and enables high-precision filtration.

Particularly, in this embodiment, the filter material may be made of polyvinylidene difluoride (PVDF) nanofiber material.

PVDF nanofibers are produced with a three-dimensional network by welding, and they are made of laminated porous nanowebs. They are ultra-thin, light-weight, have a very high volume-to-surface ratio compared to conventional fibers, .

The PVDF nanofiber web is excellent in acid resistance and chemical resistance, and has good mechanical, thermal and electrical properties. Therefore, it is widely used in various fields such as chemical, electronics, pharmaceutical, food, paper and the like.

For example, PVDF nanofiber webs can be made to have fiber pores of 2.0 μm or less, with a thickness of 0.01 to 1 mm.

Such PVDF nanofiber webs can be fabricated by calendering to reduce pore size and provide pore stability.

FIG. 3 is an enlarged view showing a state after calendering of a conventional filter material composed of micro fibers, and FIGS. 4 and 5 are an enlarged view and a cross-sectional view showing the state after calendering of the nanofiber filter material.

As shown in FIG. 3, a conventional filter material composed of micro fibers forms pores before processing. When excessive calendering is performed to form pores of 1 μm or less, pore clogging occurs.

On the other hand, as shown in FIG. 4 and FIG. 5, the filter material composed of nanofibers can control the thickness of the nanofiber web fibers in the course of forming the pores before processing, and is formed of a thick layer of fine fibers, It is possible to prepare a filter material having excellent filtration performance.

6 and 7 are graphs showing the porosity of the conventional filter material composed of microfibers and the filter material composed of the nanofibers according to the present embodiment.

As shown in FIG. 6, a microfiber of a melt-blown non-woven fabric material has a thickness of about 1 to 3 μm and a porosity of about 20 to 35% , But there was a limit in controlling the thickness of the fibers.

On the other hand, as shown in FIG. 7, the filter material composed of the PVDF nanofibers is made to have a constant thickness of about 0.2 to 0.3 μm and has an excellent porosity of about 65 to 70%.

And FIG. 8 is a graph showing the pore distribution of the conventional microfibers (B) and the PVDF nanofibers (A) according to the present embodiment.

As shown in FIG. 8, the pore distribution of conventional microfibers is in the range of about 1 to 1.4 mu m (bulk).

On the other hand, the pore distribution range (A) of the PVDF nanofiber material according to the average thickness is narrower than the pore distribution range (B) of the microfiber material, so that it has a more precise filtration effect.

And, PVDF nanofiber materials have a high tensile strength because they are composed and tightly bonded together in a chain.

As described above, according to the present invention, by using the filter material of the PVDF nanofiber material, it is possible to have a precise filtration performance and to improve the durability of the filter material.

9 is a graph showing a result of repetitive experiments on the pore distribution of the conventional microfibers (B) and the PVDF nanofibers (A) according to the present embodiment.

As shown in FIG. 9, the PVDF nanofiber material exhibits excellent reproducibility in comparison with other materials as a result of repeated experiments.

1 and 2, the case 20 is formed into a cylindrical shape having a space in which the filter medium 10 is received, and the filtrate filtered by the filter medium 10 is discharged And an end cap 23 coupled to a lower end of the case 21. The end cap 22 may be provided with a plurality of nozzles 22,

The case 21 serves to prevent deformation of the filter medium 10 accommodated therein and to transfer the entire filtrate introduced into the housing section 30 to the filter medium 10. [

To this end, a plurality of transmission holes 24 may be formed on the outer circumferential surface of the case 21 to transmit the filtration fluid to the filter medium 10.

The end cap 23 may be formed to have the same diameter as the case 21 so as to shield the lower portion of the case 21 by being coupled to the lower end of the case 21.

The case 21 and the end cap 23 generate radiant heat by using a heater of a high capacity and are directly melted and bonded.

For example, the temperature of the radiant heat may be set to about 300 to 500 DEG C, and the deposition time may be set to about 5 to 20 seconds.

As described above, according to the present invention, by merely instantaneously melting and joining only the joint portion of the case and the end cap, contamination of the filtration membrane by the polypropylene resin which is a disadvantage of the conventional injection molding method is prevented, .

The housing part 30 includes a housing 33 formed in a cylindrical shape having an opened upper surface so as to provide a space for accommodating the case part 20 therein. The housing part 30 shields the upper surface of the housing 33, A first valve assembly 35 for opening and closing an inlet 31 formed in the upper cap 34 and a second valve assembly 35 for opening and closing an outlet 32 formed in the upper cap 34. [ Assembly 36. As shown in FIG.

The first valve assembly 35 includes a leaf spring 351 that opens or closes the inlet 31 according to inflow pressure of the filtrate and a damper 352 that fixes the leaf spring 351 to the upper cap 34 can do.

The plate spring 351 is formed to be convex downward. When the inflow pressure of the filtration liquid is increased, the leaf spring 351 is elastically deformed to be close to the plane, and the amount of opening of the inlet 31 can be reduced.

In addition, the plate spring 351 has a function of maintaining the pressure of the filtration liquid flowing into the housing 33 constant by increasing the opening amount of the inlet 31 while restoring the original shape when the inflow pressure of the filtration liquid is lowered .

The damper 352 may be formed in a plate shape as shown in FIG. 2, and a coupling hole 353 may be formed on both sides of the damper 352 to be coupled to the upper cap 34, respectively.

A pair of coupling protrusions 341 may be formed at a position corresponding to the coupling hole 353 of the damper 352 around the inlet 31 of the upper cap 34. [

Accordingly, the first valve assembly 35 keeps the pressure of the filtration liquid flowing into the housing 33 constant.

The second valve assembly 36 includes a valve body 361 installed at the discharge port 32 of the upper cap 34, a ring spring 362 having one end coupled to the nozzle 22 provided at the upper portion of the case 21, And an opening / closing ball 363 integrally coupled to the tip of the spring 362 to open / close the discharge hole 364 formed in the valve body 361.

To this end, a coupling cylinder 342 may be provided around the discharge port 32 of the upper cap 34. The coupling cylinder 342 may have a space formed therein for the valve body 361 to be inserted therein.

Thus, the second valve assembly 36 discharges the filtered liquid to the outside of the housing 33 during the filtration operation, and closes the discharge port 32 by the opening and closing ball 363 when disposing the microfiltration apparatus.

Accordingly, the present invention can prevent the filtrate and the filtrate remaining in the housing from being discarded during disposal, thereby enhancing the stability of the operator and facilitating disposal thereof.

Next, a method of manufacturing a microfiltration apparatus according to a preferred embodiment of the present invention will be described in detail with reference to FIG.

FIG. 10 is a process diagram for explaining steps of a method for manufacturing a microfiltration apparatus according to a preferred embodiment of the present invention.

10, the operator fabricates the filter material 10 having a predetermined thickness and pore through calendering of the PVDF nanofiber material, and bends the filter material 10 in multiple stages using a bending device (not shown) (S10 ).

At this time, in order to maximize the contact area with the filtration liquid under the same conditions, the filter material 10 is formed into a cylindrical shape by bending the PVDF nanofiber material in a W (W) shape.

Of course, a supporting member may be provided on the inner side and the outer side of the filter medium 10.

In step S20, the operator seals both ends of the cylindrical filter member 10 formed into a cylindrical shape.

At this time, a support member may be installed on the inside and the outside of the filter medium 10 to prevent the filter medium 10 from being deformed.

Both ends of the filter material 10 are momentarily heated and sealed by impulse bonding.

For example, Table 1 is a bubble test result table of the sealed part.

Impact Current Exposure Time (s) Air pressure (bar) Bubble point (bar) Standard Deviation 1.2 2.5 1.8 0.86 1.2 3.0 3.7 0.26 1.2 4.0 4.2 0.12 1.3 2.5 4.2 0.13 1.3 3.2 4.3 0.21 1.3 4.0 3.2 0.54

According to the test results in Table 1, the air pressure in this embodiment is set to about 1 to 5 bar, and the impact current exposure time can be set to about 0.3 to 1.5 seconds.

The operator inserts the filter element 10 into the inner space of the case 21 and joins the end cap 23 to the lower end of the opened case 21. [

At this time, the case 21 and the end cap 23 can be melted and bonded as the radiant heat of approximately 300 to 500 ° C generated in a high-capacity heater is momentarily applied directly for about 5 to 20 seconds.

Of course, the heating time may vary depending on the size of the case 21 and the end cap 23.

The operator assembles the first and second valve assemblies 35 and 36 on the lower surface of the upper cap 34 and then joins the upper cap 34 to the upper end of the housing 33 in step S40.

At this time, the housing 33 and the upper cap 34 may be momentarily melted and bonded by the radiant heat of about 200 to 500 DEG C generated in the high-capacity heater for about 3 to 10 seconds.

Of course, the heating time may vary depending on the size of the housing 33 and the upper cap 34. [

Through the above process, the microfiltration apparatus forms a capsule shape, and the filtration liquid which has flowed through the inlet port 31 is filtered using the filter medium 10, and the filtrate is discharged through the discharge port 32.

Here, the first valve assembly 35 keeps the hydraulic pressure of the entire filtration fluid flowing therein constant.

The second valve assembly 36 discharges the filtrate as the open / close ball 363 is opened by a jig (not shown) coupled to the discharge port 32 during the filtration operation. When the open / close ball 363 is separated from the jig, Is moved to the discharge port 32 side by the restoring force of the ring spring 362, and the discharge port 32 is closed.

Table 2 is a table showing filtration performance tests of a microfibre material filter according to the prior art and a microfiltration device according to a preferred embodiment of the present invention.

Measurement time (min) Control Example Filtration Efficiency (%) Filtration efficiency (%) 2 99.22 99.61 5 99.55 99.72 10 96.83 99.68 20 96.77 99.56 30 96.35 99.52 40 94.66 99.47 50 94.84 99.45 60 94.80 99.56 Average 96.63 99.56

In Table 2, it can be seen that the filtration apparatus using the microfiber material according to the prior art and the microfiltration apparatus according to the preferred embodiment of the present invention have similar filtration performance at the initial sample point.

Here, the average pores of the microfiber fibers and the PVDF nanofibers are about 0.6 탆, but the maximum pores of the microfibers are about 2.4 to 2.8 탆, and the maximum pores of the PVDF nanofibers are about 0.9 탆.

Due to the difference between the maximum pore sizes of the microfibers and the PVDF nanofibers, the filtration efficiency of the filtration apparatus using the microfibre material decreases as the large particles pass through the pores and the uniform filtration performance can not be obtained .

On the other hand, the microfiltration apparatus according to the preferred embodiment of the present invention has a uniform pore size, and uniform filtration efficiency can be obtained not only at the initial stage but also over a measurement time.

Through the process as described above, the present invention can produce a capsule-type microfiltration device using a filter material of PVDF nanofiber material to remove solid particles of 1 μm or less contained in the filtrate.

Although the present invention has been described in detail with reference to the above embodiments, it is needless to say that the present invention is not limited to the above-described embodiments, and various modifications may be made without departing from the spirit of the present invention.

The present invention is applied to a microfiltration technology that removes solid particles of 1 μm or less in the semiconductor (CMP), electron (MLCC), food and beverage, and pharmaceutical materials by producing a capsular microfiltration device using a PVDF nanofiber filter material do.

10: filter medium 20: case portion
21: Case 22: Nozzle
23: End cap 24: Forwarding ball
30: housing part 31: inlet
32: outlet 33: housing
34: upper cap 341: engaging projection
342: engagement barrel 35: first valve assembly
351: leaf spring 352: damper
353: engagement hole 36: second valve assembly
361: valve body 362: ring spring
363: opening / closing ball 364: exhausting hole

Claims (11)

A filter material manufactured by bending polyvinylidene difluoride nanofiber material into a cylindrical shape, and
And a case having a space in which the filter medium is accommodated,
The filter material is prepared so that the polyvinylidene difluoride nanofiber material has a predetermined thickness and fiber pore size so as to improve the filtration performance by controlling the fiber thickness. The volume ratio, the surface area ratio, and the porosity Is made of a highly porous web,
Both ends of the filter material are sealed in accordance with a preset air pressure and impact current exposure time by an impulse adhesion method in order to prevent the structural change of the filtration membrane due to heat and minimize the morphological deformation of the filtration membrane,
A filter portion and a case portion,
And a housing part having an inlet port through which the entire filtration fluid to be filtered flows and a discharge port through which the filtrate fluid filtered by the filter medium is formed is formed in the form of a capsule filter,
Wherein the housing part includes a housing having a cylindrical shape with an upper surface opened to provide a space for accommodating the case part therein,
An upper cap which shields an upper surface of the housing and has an inlet and an outlet,
A first valve assembly for opening and closing the inlet so as to keep the inflow pressure of the filtration constant,
And a second valve assembly for opening and closing the outlet. The method according to claim 1,
The casing may have a cylindrical shape and may have a space in which the filter medium is received. The casing may have a nozzle at an upper portion thereof to discharge the filtrate filtered by the filter medium to the discharge port.
And an end cap coupled to a lower end of the case,
Wherein the case and the end cap are radiant heat generated by using a heater of a high capacity to be directly melted and then bonded. delete 3. A valve assembly according to claim 1 or 2, wherein the first valve assembly
The leaf spring which is elastically deformed according to the inflow pressure of the filtration whole
And a damper for opening or closing the inlet according to the elastic deformation of the leaf spring. 3. A valve assembly according to claim 1 or 2, wherein the second valve assembly
A valve body installed at the discharge port,
A ring spring whose one end is coupled to a nozzle provided on the upper portion of the case,
And a check valve which is integrally coupled to the tip of the ring spring and includes an opening / closing ball for opening / closing an exhaust hole formed in the valve body. (a) bending a nanofiber material to produce a filter material in a cylindrical shape,
(b) sealing both ends of the filter media; and
(c) joining the case of the case portion in which the filter medium is accommodated and the end cap,
(d) joining the housing of the housing part and the upper cap to the inside of which the case part is accommodated, thereby manufacturing a capsule-type microfiltration device,
The step (a) may include: (a1) performing a de-aeration process so that the thickness and pore of the nanofiber material become constant; and
(a2) bending the nanofiber material in a W-shaped manner to produce a filter material in a cylindrical wrinkle filter shape,
The nanofiber material is prepared so as to have a predetermined thickness and fiber pore size so as to improve the filtration performance by controlling the thickness of the fiber. As compared with the conventional fiber material, the volume-to-surface ratio and the porosity A high-porosity web,
Wherein both ends of the filter medium are sealed according to an air pressure and an impact current exposure time set in advance by an impulse adhesion method in order to prevent the structural change of the filtration membrane due to heat and minimize the morphological deformation of the filtration membrane. delete delete The method according to claim 6,
In the step (b), the air pressure is set to 1 to 5 bar,
And the impact current exposure time is set to 0.3 to 1.5 seconds. 10. The method of claim 9,
In the step (c), radiant heat of 300 to 500 ° C generated in the heater is applied to the case and the end cap for 5 to 20 seconds to melt and bond the joint part of the case and the end cap to manufacture a cartridge- Wherein said microfiltration device is a microfiltration device. 7. The method of claim 6, wherein step (d)
(d1) assembling a first valve assembly for opening and closing an inlet formed on the lower surface of the upper cap and a second valve assembly for opening and closing the outlet,
(d2) applying a radiant heat of 200 to 500 DEG C generated in the heater to the upper cap and the housing for 3 to 10 seconds to melt and join the joint portion of the upper cap and the housing. ≪ / RTI >

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