KR20220121296A - Method of manufacturing fabric with electrostatic force, method of manufacturing air filtering article and mask - Google Patents

Abstract

Provided are: a method for manufacturing a fabric having an electrostatic force; a method for manufacturing an air filtration article; and a mask. The method for manufacturing a fabric having an electrostatic force according to the present invention comprises the steps of: forming an electrospun web on at least one surface of the fabric by electrospinning an electrospinning solution on at least one surface thereof; and peeling the electrospun web from the fabric.

Description

Method for manufacturing a fabric imparted with electrostatic force, a method for manufacturing an air filtration article, and a mask

The present invention relates to a method of making an electrostatically applied fabric, a method of making an air filtration article and a mask.

The mask worn to protect the respiratory tract from fine dust and microorganisms is composed of a non-woven fabric such as a cover web on the outer layer and melt blown on the inner layer. For melt blown having filtration performance, an electrostatic filter to which an electrostatic force is imparted is often used. The cover web uses a nonwoven fabric with little particle filtration efficiency and a low differential pressure, and serves to protect the inner filter. The electrostatic filter improves the protection performance by increasing the particle collection efficiency compared to the differential pressure. In addition, as the particles collected by the use of the mask block the pores of the filter fiber, the differential pressure gradually increases, thereby increasing the wearer's breathing resistance and physiological burden.

Accordingly, a method of increasing particle collection efficiency by applying static electricity to the cover web is being considered. Conventionally, methods such as corona charging and hydrocharging may be considered as a method of applying static electricity. However, the above method has a problem that the process is large-scale and complicated.

The background technology of the present invention is described in Korean Patent Application Laid-Open No. 10-2002-0041738 and the like.

An object of the present invention is to provide a method that can maintain a pressure drop compared to before electrostatic force is applied, can lower particle permeability by applying electrostatic force, and can produce a fabric to which electrostatic force is applied in a simple way will be.

One aspect of the present invention is a method of manufacturing a fabric to which an electrostatic force is imparted.

A method of manufacturing a fabric imparted with an electrostatic force comprises the steps of electrospinning an electrospinning solution on at least one surface of the fabric to form an electrospun web on at least one surface of the fabric, and peeling the electrospun web from the fabric .

Another aspect of the present invention is a method of making an air filtration article.

A method of manufacturing an air filtration article includes manufacturing a fabric to which an electrostatic force is imparted according to the method, and laminating the fabric to which the electrostatic force is applied and a filter for collecting particles.

Another aspect of the invention is a mask.

The mask is manufactured by a method comprising the step of laminating a fabric applied with an electrostatic force prepared according to the method of the present invention and a filter for collecting particles.

The present invention provides a method for manufacturing a fabric to which the electrostatic force is imparted, in which the differential pressure can be maintained compared to before the electrostatic force is applied, the particle permeability can be lowered by the electrostatic force being applied, and the electrostatic force is applied in a simple manner.

1 is a schematic diagram showing a process of electrospinning an electrospinning solution on one surface of the fabric in the present invention.
2 is a photograph showing the process of peeling the electrospun web from the fabric in the present invention and measuring the static electricity.
3 is a specific example of a cross section of a mask manufactured by the mask manufacturing method of the present invention.
4 is an evaluation result of the differential pressure and filtration performance of the fabrics prepared in Example 1 (marked in blue and yellow) and Comparative Example 1 (marked in red).
5 is an evaluation result of differential pressure and filtration performance of fabrics prepared in Example 2 (displayed in blue) and Comparative Example 2 (displayed in red).
6 is an evaluation result of the differential pressure and filtration performance of the masks prepared in Example 3 (indicated in green) and Comparative Example 3 (indicated in yellow).
7 is an evaluation result of the differential pressure and filtration performance of the masks prepared in Example 4 (displayed in blue) and Comparative Example 4 (displayed in yellow).

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Since this embodiment can apply various transformations and can have various embodiments, specific embodiments are illustrated in the drawings and described in detail. The following examples are only presented to understand the content of the present invention, and are not intended to be limited to specific embodiments, and should be understood to include all transformations, equivalents and substitutes included in the spirit and scope of the present invention. do. In describing the present invention, if it is determined that a detailed description of a related known technology may obscure the gist of the present invention, the detailed description thereof will be omitted.

The present invention provides a method capable of maintaining a pressure drop compared to before electrostatic force is applied, reducing particle permeability by applying electrostatic force, and manufacturing a fabric to which electrostatic force is applied in a simple manner.

According to the method of the present invention, since the differential pressure is maintained compared to before the electrostatic force is applied, it is possible to prevent a phenomenon in which breathing of the mask wearer becomes difficult when the fabric of the present invention is used as a cover web such as a mask. The cover web includes the cover web detailed above.

As used herein, the "differential pressure" for the fabric means the difference in pressure between the inner and outer sides of the fabric, and in the present specification, the differential pressure is 2mmH ₂ O or less, for example, 0mmH ₂ O to 2mmH ₂ O, 0.5mmH ₂ O to 2mmH Aim for ₂ O.

According to the method of the present invention, it is possible to lower the particle permeability by imparting an electrostatic force. This may reduce the overall particle transmittance of the mask when the fabric manufactured according to the method of the present invention is used as a cover web such as a mask. In addition, it is possible to further extend the particle collection life in the melt blown web in the mask. In the mask, the melt blown web is located on the wearer's side compared to the cover web, and is mainly responsible for collecting particles from the mask.

The method of the present invention can impart electrostatic force to the fabric in a remarkably simple method compared to conventional methods such as corona charging and hydrocharging for imparting electrostatic force to the fabric. In addition, the method of the present invention can impart an electrostatic force to the fabric without increasing the thickness of the fabric compared to the conventional method.

Hereinafter, the method for manufacturing the fabric to which the electrostatic force of the present invention is imparted will be described in more detail.

The method for producing a fabric imparted with an electrostatic force of the present invention comprises the steps of: forming an electrospun web on at least one surface of the fabric by electrospinning an electrospinning solution on at least one surface of the fabric, and peeling the electrospun web from the fabric includes

The fabric 2 (before electrostatic force is applied) has a differential pressure of 2 mmH ₂ O or less, for example, 0 mmH ₂ O to 2 mmH ₂ O. It may include a fabric having a very low resistance to permeation of air through the inside and outside of the fabric. . For example, the fabric may include a fabric manufactured by a method such as spunbond, carding, needle punch, spunlace, meltblown, etc., It is not limited thereto. The material for the fabric is not particularly limited, but may include, for example, felt, polypropylene (PP), and the like. The fabric may have a basis weight of 5 to 50 gsm (g/m ² ), preferably 10 to 40 gsm (g/m ² ). Within the above range, the effects of the present invention can be well realized.

(Before the electrostatic force is applied) The fabric (2) may be a fabric having a weak electrostatic force. For example, the voltage measured for the fabric may be less than or equal to 0.5 kV, such as 0 kV to 0.5 kV, specifically 0.1 kV to 0.45 kV.

In one embodiment, the fabric 2 (before the electrostatic force is applied) may have a particle transmittance of at least 90%, for example between 95% and 100%. This means that the fabric has little ability to trap particles.

In the present specification, "particle permeability" refers to NaCl particles (particle concentration of 22±1 mg/m ³ , particle size of 0.075 μm based on CMD, 0.26 μm based on MMD) with respect to the fabric, and NaCl particle flow rate of 85 lpm with respect to the effective area of 100 cm ² of the fabric. (Linear velocity 14.2 cm/sec), it means the value measured when permeated under the conditions of the maximum NaCl particle content of 35 mg.

The fabric 2 (before the electrostatic force is applied) may have a thickness of 100 μm to 500 μm, specifically 250 μm to 300 μm. In the above range, it may be applied as a cover web of the mask, and even if the electrospinning web is peeled off, there may be no damage such as tearing.

In the present invention, an electrospinning solution is electrospun on at least one surface of the fabric to form an electrospun web on at least one surface of the fabric. Here, "electrospinning web" refers to a state in which polymers contained in an electrospinning solution are entangled with each other in a network form. Referring to Figure 1, the process of forming the electrospun web will be described in more detail.

Referring to FIG. 1 , the fabric 2 is fixed in a contact state before electrostatic force is applied to the collector 1 for electrospinning. The electrospinning solution (4) is filled in the electrospinning syringe (3), and the electrospinning solution (4) is spun onto the fabric (2) before electrostatic force is applied through the electrospinning nozzle (5) at a predetermined distance. In this way, an electrospun web 6 is formed on the surface of the fabric 2 .

The syringe 3 for electrospinning may reciprocate at a speed of 10 mm/sec to 100 mm/sec in the collector length direction during the spinning process. The range of reciprocating motion of the electrospun syringe 3 may be within the width of the collector or within the distance at which the electrospun fibers are entrapped in the fabric 2 .

The collector 1 for electrospinning may be fixed in a state in which the fabric 2 is in contact, but may be rotated at a speed of 50 rpm to 200 rpm in a state in which the fabric 2 is in contact. Through this, the effects of the present invention can be better realized. The collector 1 for electrospinning may be formed of a common material known to those skilled in the art, and a drum-type collector may be used in consideration of the shape of the fabric 2 and the efficiency of electrospinning.

The fabric 2 may be fixed in a state in contact with the collector 1 for electrospinning. For example, the fabric 2 may be spread on the collector 1 for electrospinning, or the fabric 2 may be wrapped around the collector 1 for electrospinning as in FIG. 1 .

Electrospinning solution (4) is polystyrene, polyacrylonitrile, polyethylene terephthalate, polytrimethylene terephthalate, polyethylene (Polyethlene), polyvinylidene fluoride ( Polyvinylidene fluoride), polyethylene oxide, polyurethane, polylactic acid, polysulfone, polyamide-6, polyvinyl alcohol, polyvinyl It may be a polymer solution containing at least one of butyral (Polyvinyl butyral) and ABS resin (Acrylonitrile butadiene styrene). Preferably, the polymer may include at least one of polyacrylonitrile and polystyrene.

In one embodiment, the polymer contained in the electrospinning solution (4) may be of a different type than the polymer forming the fabric (2).

The electrospinning solution 4 may further include a solvent for dispersing the polymer in order to facilitate electrospinning. If the solvent does not dissolve the polymer and does not clog the electrospinning nozzle during electrospinning or interfere with voltage application during electrospinning, there is no particular limitation on the type thereof. For example, the solvent may include dimethylformamide, tetrahydrofuran, acetone, ethanol, water, and the like.

The polymer in the electrospinning solution (4) may be included in a concentration of 10 w/v% to 20 w/v%. In the above range, the electrospun web formation can be easy, and the electrostatic force can be well imparted to the fabric.

During electrospinning, the distance between the electrospinning nozzle (5) and the fabric (2) is 10 cm to 20 cm, the spinning speed of the electrospinning solution (4) from the electrospinning nozzle (5) is 1 ml/hr to 5 ml/hr, for electrospinning The voltage applied between the nozzle 5 and the collector 1 for electrospinning may be 5 kV or more, for example, 5 kV to 20 kV. In the above range, the electrospun web can be well formed on the fabric, and when the electrospun web is peeled off, the electrospun web can be peeled off from the fabric 2 without residue, so that electrostatic force can be imparted without increasing the differential pressure.

The electrospinning web can be formed by spinning the electrospinning solution 4 from the electrospinning nozzle 5 into the electrospinning solution 4' in the form of fibers through electrospinning.

The electrospinning nozzle (5) and the collector (1) are connected to each other by a power supply (6), so that the present invention can provide the required voltage.

During electrospinning, the electrospinning solution may be spun over the entire surface of the fabric to form an electrospun web over the entire surface of the fabric. Alternatively, only a portion of the surface of the fabric may be spun to facilitate subsequent peeling of the electrospun web.

An electrospun web is formed on at least one surface of the fabric 2 through the above electrospinning process. The electrospun web may have a thickness of from 1 μm to 100 μm, for example from 10 μm to 50 μm. In the above range, the electrospun web can be well delaminated from the fabric so that the electrostatic force can be well imparted. The thickness of the electrospun web may be less than the thickness of the fabric. In this way, the electrostatic force can be well imparted to the fabric by the friction force when peeling the electrospun web from the fabric. For example, the thickness of the electrospun web: the thickness of the spun web fabric may be 1:2 to 1:10, specifically 1:5 to 1:10. In the above range, the electrostatic force can be well imparted to the fabric by the friction force when peeling the electrospun web from the fabric.

In the present invention, electrostatic force is imparted to the fabric through both a voltage applied to the fabric during electrospinning and friction when peeling the electrospun web from the fabric. During electrospinning, the nozzle for electrospinning and the collector for electrospinning are electrically connected to each other and the collector for electrospinning is in contact with the fabric, so the voltage applied during electrospinning may affect the fabric. All of the above-mentioned effects of the present invention could not be obtained by the voltage applied to the fabric during electrospinning and the friction alone when peeling the electrospun web from the fabric.

The present invention includes peeling the electrospun web from the fabric. This will be described in more detail with reference to FIG. 2 .

Referring to Fig. 2, in the method of the present invention, the electrospun web is peeled from the fabric (in Fig. 2, a spunbond web is used as an example of the fabric).

The process of delamination of the electrospun web from the fabric creates friction in the fabric, which can help to impart an electrostatic force to the fabric. In the present invention, in the application of electrostatic force through peeling, instead of adhering different types of fabrics to the fabric using an adhesive or the like, an electrospun web is formed on the fabric through electrospinning, so that the electrospun web is removed from the fabric without increasing the differential pressure of the fabric. can be easily peeled off to impart electrostatic force to the fabric.

The peeling method is not particularly limited when peeling the electrospun web from the fabric. For example, the electrospun web may be peeled from the fabric by hand, or the electrospun web may be peeled from the fabric using a peeler known to those skilled in the art.

The fabric to which the electrostatic force produced by the method of the present invention is imparted has a differential pressure of 2mmH ₂ O or less, for example, 0mmH ₂ O to 2mmH ₂ O. Through this, it can be sufficiently used as a cover web when manufacturing a mask or the like.

The method of the present invention can be used as a cover web in a mask or the like because the difference in pressure difference between the fabric before electrostatic force is applied (ie, before electrospinning) and the fabric to which electrostatic force is applied is very small. For example, the difference between the differential pressure of the fabric before electrostatic force is applied (i.e., before electrospun) and the differential pressure of the fabric subjected to electrostatic force is 2 mmH ₂ O or less, for example, 0 mmH ₂ O to 2 mmH ₂ O. .

For the fabric imparted with an electrostatic force produced by the method of the present invention, the electrostatic force can be measured by a conventional method. For example, as shown in FIG. 2 , one surface of the fabric may be measured at 25° C. using an electrostatic measuring device. The electrostatic force applied fabric produced by the method of the present invention may have a measured voltage of 2.0 kV or more, for example, 2.0 kV to 6.0 kV. In the above range, the particle trapping efficiency is increased to provide a certain degree of particle trapping effect in the cover web such as a mask.

The fabric to which the electrostatic force produced by the method of the present invention is imparted has a lower particle transmittance compared to the fabric before electrospinning, so that when used as a cover web for a mask, it is possible to exhibit a particle trapping effect. For example, in the method of the present invention, the difference in particle transmittance between the fabric before electrospinning and the fabric to which the electrostatic force is applied may be 10% or more, for example, 10% to 30%. The electrostatically applied fabric produced by the method of the present invention may have a particle transmittance of 95% or less, for example, 70% to 95%. In the above range, the particle trapping efficiency is increased to provide a certain degree of particle trapping effect in the cover web such as a mask.

As described above, the fabric with electrostatic force produced according to the method of the present invention has a low differential pressure and low particle transmittance, so it has a particle collection function. can be used

Hereinafter, the manufacturing method of the air filtering article of this invention is demonstrated.

A method of manufacturing an air filtration article comprises electrospinning an electrospinning solution on at least one surface of a fabric to form an electrospun web on at least one surface of the fabric, and peeling the electrospun web from the fabric to form a fabric imparted with an electrostatic force. and laminating the fabric to which the electrostatic force is applied and a filter for collecting particles.

The steps for producing the electrostatically applied fabric are substantially the same as described above. Therefore, here, the step of laminating the fabric to which the electrostatic force is applied and the filter for collecting particles will be described in more detail.

The filter for collecting particles may include a conventional filter as long as it substantially serves to collect particles in an air filtration article including an air purifying filter for masks, air purifiers, air conditioners, automobiles, and the like. For example, the filter for collecting particles may include a filter manufactured by a melt blown method. The filter manufactured by the melt blown method has significantly smaller pores than the cover web, so the particle collection performance is relatively high compared to the cover web.

The filter for collecting particles and the fabric imparted with an electrostatic force may be laminated by a conventional method known to those skilled in the art. For example, it may be carried out by a method of simply layering a filter for collecting particles and a fabric to which an electrostatic force is applied without an adhesive.

Referring to FIG. 3 , a method for manufacturing a mask in an air filtering article will be described in detail.

Referring to FIG. 3 , the first fabric 11 may be laminated on the lower surface of the particle collecting filter 10 , and the second fabric 12 may be laminated on the upper surface of the particle collecting filter 10 . The second fabric 12 may comprise an electrostatically applied fabric made according to the method of the present invention. The first fabric 11 may be a non-electrostatically applied fabric or an electrostatically applied fabric manufactured according to the method of the present invention.

The second fabric 12 may be laminated on the upper surface of the particle collecting filter 10 in one or more layers, for example, one or two layers.

A reinforcing material 13 may be further laminated between the second fabric 12 and the particle collecting filter 10 to increase the strength of the mask. The stiffener 13 may comprise a stiff web having a range of voids.

Air filtration articles produced by the methods of the present invention may include, but are not limited to, masks, air filters, air purifiers, air filters in air conditioners, and the like.

Hereinafter, the present invention will be described in more detail by way of Examples and Comparative Examples.

Example 1

[Preparation of electrospinning solution]

Polyacrylonitrile (PAN) was added to a solvent N,N-dimethylformamide (DMF) and stirred at room temperature for at least 24 hours to prepare a 10w/v% PAN solution.

Polystyrene (PS) was placed in a mixed solvent of N,N-dimethylformamide (DMF) and tetrahydrofuran (THF) in a 1:1 weight ratio and stirred at room temperature for at least 24 hours to prepare a concentration of 16w/v% PS solution .

[Electrospinning condition setting]

PAN and PS electrospun webs were manufactured using electrospinning equipment (ESR200D, NanoNC). Each web production condition was set as follows.

The prepared 10w/v% PAN solution was put into a syringe of 10ml electrospinning equipment, and a 25 gauge (OD 0.51mm, ID 0.26mm) metal spray nozzle mounted on the syringe ejection area was used. The syringe containing the electrospinning solution was connected to a metering pump, and the metering pump sprayed a total of 1.0 ml of the solution at a rate of 3 ml per hour. A voltage of 16 kV was constantly applied to the syringe nozzle to generate electrospun fibers. The syringe was reciprocated by 15 cm left and right at a speed of 60 mm/sec. The distance between the nozzle and the collector was fixed at 11 cm.

The prepared 16w/v% PS solution was put into a syringe of 10ml electrospinning equipment, and a metal spray nozzle mounted on the syringe discharge site was 22 gauge (OD 0.72mm, ID 0.41mm). The syringe containing the solution was connected to a metering pump, and the metering pump dispensed a total of 1.2 ml of solution at a rate of 3 ml per hour. A 20 kV voltage was constantly applied to the syringe nozzle to generate electrospun fibers. The syringe was reciprocated by 15 cm left and right at a speed of 60 mm/sec. The distance between the nozzle and the collector was fixed at 15 cm.

The collector was connected to the ground and rotated at 100 rpm.

[Give electrostatic force to the cover web]

A basis weight of 20 gsm (g/m ² ) A polypropylene (PP) material spunbond web was wrapped around a collector, and electrospinning was performed under the above conditions to form an electrospun web on the spunbond web. The spunbond web and electrospun web were manually separated from the collector. By peeling the electrospun web from the spunbond web, an electrostatically applied fabric was prepared.

Example 2

In Example 1, the same method as in Example 1 was performed except that the electrospinning conditions were changed for the PS solution prepared above on the basis weight of 20 g/m ² spunbond and additionally on the basis weight of 40 g/m ² spunbond web, and the electrostatic force was The given fabric was prepared.

Comparative Example 1

Measurements were made on the spunbond web in Example 1 (state before electrostatic treatment).

Comparative Example 2

Measurements were made on the spunbond web in Example 2 (state before electrostatic treatment).

Experimental Example 1

[Measure the voltage on the fabric]

In order to check whether static electricity was generated, static electricity on the fabric surface was measured using a static electricity measuring device (Trek 542A-2). The cover web of Comparative Example 1 was measured to be 0.13 to 0.42 kV. On the other hand, the cover web of Example 1 measured between 2.32 kV and 5.74 kV. Through this, it was confirmed that the method of the present invention imparted static electricity to the cover web.

[Differential pressure and particle permeability measurement]

In order to measure the filter efficiency (filtration performance) for particles, the performance of the fabrics of Example 1 and Comparative Example 1 was evaluated using a TSI 8130A automated filter tester. The results are shown in FIG. 4 .

The differential pressure was measured by intake resistance. Particle permeability was measured to be 85 lpm, NaCl (CMD~0.075 μm, MMD~0.26 μm) particles up to 35 mg.

Referring to FIG. 4 , it was found that the cover web of Comparative Example 1 had no filtration performance with a differential pressure of 1.5 mmH ₂ O or less and an initial particle transmittance of 100%. On the other hand, in the cover web of Example 1, the differential pressure was 1.5 mmH ₂ O or less, the initial particle permeability (1.1 mg injection) was 81.7% and 75.7%, respectively, and the maximum particle transmission rate (34.5 mg injection) was 95.8% and 92.9%, respectively. became Through this, it was confirmed that the method of the present invention has a function of collecting particles by lowering the particle permeability without increasing the differential pressure. After 35 mg of NaCl (CMD ~ 0.075 μm, MMD ~ 0.26 μm) particles were sprayed, the cover web of Comparative Example 1 had no collecting function, whereas it can be confirmed that the cover web of Example 1 had a collecting function.

Experimental Example 2

For Example 2 and Comparative Example 2, the differential pressure and particle permeability were measured in the same manner as in Experimental Example 1. The results are shown in FIG. 5 .

Referring to FIG. 5 , the cover web of Comparative Example 2 exhibited a particle transmittance close to 100% and a differential pressure of 1 mmH ₂ O. On the other hand, it can be seen that the cover web of Example 2 has a differential pressure of 1 mmH ₂ O and a particle permeability is lowered to 80%, thereby providing a particle filtration efficiency of 20%.

Example 3

An air filtration article was prepared by laminating one layer of the spunbond web to which the electrostatic force was applied and the first layer of the melt blown filter prepared in Example 1.

Comparative Example 3

An air filtration article was made with one layer of a melt blown filter, without the spunbond web imparted with electrostatic forces in Example 3.

Experimental Example 3

For Example 3 and Comparative Example 3, the differential pressure and particle permeability were measured in the same manner as in Experimental Example 1. The results are shown in FIG. 6 .

Referring to FIG. 6 , the particle transmittance of Example 3 decreased from 17.3% to 13.5%. After the injection of 2.3 mg particles, the differential pressure difference started to appear, and the differential pressure decreased by 1.78% to 27.90% compared to Comparative Example 3. The particle injection amounts were 49.52 mg and 55.09 mg, respectively, until the maximum differential pressure (150 mmH ₂ O) was reached.

Example 4

An air filtration article was prepared by sequentially stacking one layer of a melt blown filter on two layers of the spunbond web to which the electrostatic force was applied, prepared in Example 1.

Comparative Example 4

An air filtration article was made with one layer of a melt blown filter without the electrostatically applied spunbond web in Example 4.

Experimental Example 4

For Example 4 and Comparative Example 4, the differential pressure and particle permeability were measured in the same manner as in Experimental Example 1. The results are shown in FIG. 7 .

Referring to FIG. 7 , the initial particle transmittance was about 16.6% in Comparative Example 4, while it was lowered to about 10.9% in Example 4. The differential pressure showed a reduction effect of 1.35%~39.47% after 1.87mg particle injection.

Simple modifications or changes of the present invention can be easily carried out by those of ordinary skill in the art, and all such modifications or changes can be considered to be included in the scope of the present invention.

Claims (7)

electrospinning an electrospinning solution on at least one surface of the fabric to form an electrospun web on at least one surface of the fabric;
and peeling the electrospun web from the fabric.
The method of claim 1, wherein the fabric has a differential pressure of 2mmH ₂ O or less.
The method of claim 1, wherein the forming of the electrospun web comprises: fixing the fabric in contact with an electrospinning collector, filling an electrospinning syringe with the electrospinning solution, and passing the electrospinning nozzle through the electrospinning nozzle. electrospinning a spinning solution onto the fabric;
The voltage applied between the electrospinning nozzle and the electrospinning collector is 5 kV or more.
The method of claim 1, wherein the thickness of the electrospun web: the thickness of the fabric is 1:2 to 1:10.
5. A method of making an air filtration article comprising the step of laminating the electrostatically applied fabric produced according to any one of claims 1 to 4 and a filter for collecting particles.
The method for manufacturing an air filtration article according to claim 5, wherein the filter for collecting particles comprises a filter manufactured by a melt blown method.
[Claim 5] A mask manufactured by a method comprising the step of laminating a fabric to which an electrostatic force is applied and a filter for collecting particles according to any one of claims 1 to 4.

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