A filtering device and a mask with an electrospun nanofiber cloth

Abstract

The object of the present invention is to provide a filtering device and a mask having an electrospun nanofiber cloth, comprising: an electrospun nanofiber cloth and a melt-blown nonwoven fabric; the melt-blown nonwoven fabric is disposed on at least one side of the electrospun nanofiber cloth and forms a filtering structure with two or more layers with the electrospun nanofiber cloth; the relationship between the fiber diameters of the electrospun nanofiber cloth and the melt-blown nonwoven fabric shows an inverse correlation; the fiber diameter of the melt-blown nonwoven fabric is 1-5 μm; the fiber diameter of the electrospun nanofiber cloth is 0.1-0.5 μm. Through the setting of the above fiber diameters, the present invention forms a filtering combination of the electrospun nanofiber cloth and the melt-blown nonwoven fabric, and has a hierarchical filtering structure with different filtering effects on substances such as solid particles, bacteria, and viruses of different sizes. Further, it has a low gram weight and a high porosity, ensuring that it will not have a large blocking effect on the air flow when there is a high-speed air flow passing through.

Description

Technical Field

[0001] The present invention belongs to the field of respiratory protection, and particularly relates to a filtering device and a mask with an electrospun nanofiber cloth. Background Art

[0002] In the prior art, masks made of melt-blown non-woven fabrics are increasingly widely used. The melt-blown layer contained in the melt-blown non-woven fabric can generate static electricity through electretization, thereby forming an adsorption effect on particles in the air; at the same time, the melt-blown non-woven fabric can form a relatively large pore size structure, which is conducive to the smooth passage of air flow, so that the wearer will not have problems with unsmooth breathing due to wearing the mask.

[0003] Although the melt-blown layer in the melt-blown non-woven fabric has a good filtering effect on particles with larger particle sizes, some particles with smaller particle sizes can still penetrate the melt-blown non-woven fabric and enter the human body, making the filtering effect of the melt-blown non-woven fabric mask unsatisfactory.

[0004] In the prior art, high-performance electrospun nanofiber filter materials need to have the characteristics of high efficiency and low resistance. Conventional high-performance electrospun nanofiber filter materials can match parameters such as pore size and packing density to achieve particle filtration. However, usually, while having high efficiency, they bring a very high pressure resistance, resulting in poor ventilation performance. Therefore, it is very difficult to effectively balance the filtration efficiency and the pressure resistance only by the structural characteristics of the high-performance electrospun nanofibers themselves.

[0005] In summary, the products of the prior art cannot take into account both the filtering effect and the air flow resistance, and it is necessary to improve the existing products. Summary of the Invention

[0006] The purpose of the present invention is to provide a filtering device and a mask with an electrospun nanofiber cloth, which can ensure excellent filtering performance while not blocking the air flow, thereby not causing an increase in the resistance pressure drop.

[0007] To achieve the above purpose, a filtering device with an electrospun nanofiber cloth provided by the present invention includes:

[0008] An electrospun nanofiber cloth;

[0009] A melt-blown non-woven fabric, which is arranged on at least one side of the electrospun nanofiber cloth and forms a filtering structure of two or more layers with the electrospun nanofiber cloth;

[0010] The relationship between the fiber diameter of the electrospun nanofiber cloth and the fiber diameter of the melt-blown non-woven fabric is inversely correlated;

[0011] If the fiber diameter of the melt-blown non-woven fabric increases, the fiber diameter of the electrospun nanofiber cloth decreases;

[0012] The fiber diameter of the meltblown non-woven fabric is 1-5 μm;

[0013] The fiber diameter of the electrospun nanofiber fabric is 0.1-0.5 μm.

[0014] Furthermore, the relationship between the fiber diameter of the electrospun nanofiber fabric and that of the meltblown non-woven fabric satisfies the following inverse proportional function:

[0015] y = 0.5 / x;

[0016] x is the fiber diameter of the meltblown non-woven fabric;

[0017] y is the fiber diameter of the electrospun nanofiber fabric.

[0018] Furthermore, the relationship between the fiber diameter of the electrospun nanofiber fabric and that of the meltblown non-woven fabric satisfies the formula:

[0019] x = y 2 -10.6y + 6.05;

[0020] x is the fiber diameter of the meltblown non-woven fabric;

[0021] y is the fiber diameter of the electrospun nanofiber fabric.

[0022] Furthermore, the fiber diameter of the meltblown non-woven fabric is 5 μm;

[0023] The fiber diameter of the electrospun nanofiber fabric is 0.1 μm;

[0024] Or:

[0025] The fiber diameter of the meltblown non-woven fabric is 1 μm;

[0026] The fiber diameter of the electrospun nanofiber fabric is 0.5 μm.

[0027] Furthermore, the gram weight of the meltblown non-woven fabric is: 10-40;

[0028] The gram weight of the electrospun nanofiber fabric is: 0.05-0.5.

[0029] Furthermore, the porosity of the electrospun nanofiber fabric is 1.10-1.29 times that of the meltblown non-woven fabric, and the porosity of the meltblown non-woven fabric is 70-90%.

[0030] Further, the filtration efficiency of the melt-blown non-woven fabric for particles with a size of 0.02 - 10 μm ranges from 80% to 96%, and the filtration efficiency of the electrospun nanofiber fabric for particles with a size of 0.02 - 10 μm ranges from 70% to 93%. Moreover, the filtration efficiency value of the melt-blown non-woven fabric for particles with a size of 0.02 - 10 μm is 1.05 - 1.6 times that of the electrospun nanofiber fabric.

[0031] Further, the melt-blown non-woven fabric is disposed on one side of the electrospun nanofiber fabric or on both sides of the electrospun nanofiber fabric.

[0032] A mask with an electrospun nanofiber fabric, comprising:

[0033] A mask body, including an inner layer and an outer layer, wherein the inner layer is used to fit against the user's face;

[0034] The filtering device as described in the foregoing solution, which is disposed between the inner layer and the outer layer;

[0035] The melt-blown non-woven fabric is disposed on at least one side of the electrospun nanofiber fabric to support the electrospun nanofiber fabric.

[0036] Further, the inner layer includes non-woven fabric;

[0037] And / or, the outer layer includes non-woven fabric.

[0038] The mask with an electrospun nanofiber fabric as described above further includes a strap:

[0039] The strap is used to hold the mask body on the user's face.

[0040] Further, the strap includes an ear-hanging type, a strap type or a pull-on type.

[0041] Further, the mask body includes a flat type or a three-dimensional type.

[0042] The present invention has at least the following beneficial effects: By setting the above-mentioned fiber diameters, the present invention forms a filtration combination of an electrospun nanofiber fabric and a melt-blown non-woven fabric, which has a hierarchical filtration structure with different filtration efficiencies for substances such as solid particles, bacteria, and viruses of different sizes, and can ensure smooth gas flow.

[0043] The meltblown nonwoven fabric in the present invention has an electrostatic adsorption effect due to the electret effect, has a good filtering effect on particles with larger particle sizes, can form a larger pore structure, and is conducive to the smooth passage of air flow; while the electrospun layer has excellent filtering performance for ultra-fine particles, and then determines the fiber diameter by using the corresponding relationship with the fiber diameter of the meltblown nonwoven fabric, ensuring that it will not block the air flow when the high-speed air flow passes through and will not cause an increase in the resistance pressure drop. The filtering structure described in the present invention can ensure excellent filtering performance while not blocking the air flow, thereby not causing an increase in the resistance pressure drop. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0045] Figure 1 It is a stacked diagram of the meltblown nonwoven fabric and the electrospun nanofiber fabric according to an embodiment of the present invention.

[0046] Figure 2 It is an electron microscope image of the combination of the meltblown nonwoven fabric and the electrospun nanofiber fabric according to an embodiment of the present invention.

[0047] Figure 3 It is a stacked diagram of Embodiment 2 of the present invention.

[0048] Figure 4 It is a schematic diagram of a mask according to Embodiment 2 of the present invention.

[0049] In the figure: 1 - mask body, 12 - inner layer, 11 - outer layer, 2 - filtering device, 21 - meltblown nonwoven fabric, 22 - electrospun nanofiber fabric, 3 - strap. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0050] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0051] The following describes the specific implementation of the present invention in detail with reference to specific embodiments:

[0052] Embodiment 1

[0053] Refer to the attached drawings of the specification Figure 1-2 , it is a filtering device 2 with an electrospun nanofiber fabric, including an electrospun nanofiber fabric 22 and a meltblown nonwoven fabric 21.

[0054] Such as Figure 1Shown is a preferred embodiment, where the melt-blown nonwoven fabric 21 is disposed on one side of the electrospun nanofiber fabric 22 to support the electrospun nanofiber fabric 22. When the melt-blown nonwoven fabric 21 is a single layer, the melt-blown nonwoven fabric 21 and the electrospun nanofiber fabric 22 form a two-layer filtration structure. When the melt-blown nonwoven fabric 21 is multiple layers, the melt-blown nonwoven fabric 21 and the electrospun nanofiber fabric 22 form a multi-layer filtration structure. In another embodiment, the melt-blown nonwoven fabric 21 can also be disposed on both sides of the electrospun nanofiber fabric 22 simultaneously.

[0055] In Figure 2 it, the thick fibers below are the fibers of the melt-blown nonwoven fabric 21, and the thin fibers and bead-like structures above are the fiber structure of the electrospun nanofiber fabric 22. The surface of the electrospun nanofiber fabric 22 in this embodiment has a spider-web-like microporous structure, with very complex changes such as network connectivity, pore nesting, and pore channel bending in the three-dimensional structure, making it have excellent surface filtration performance.

[0056] The relationship between the fiber diameters of the electrospun nanofiber fabric and the melt-blown nonwoven fabric satisfies an inverse proportional function relationship as follows:

[0057] y = 0.5 / x;

[0058] x is the fiber diameter of the melt-blown nonwoven fabric 21;

[0059] y is the fiber diameter of the electrospun nanofiber fabric 22.

[0060] Preferably, the fiber diameter of the melt-blown nonwoven fabric 21 is 5 μm, and the fiber diameter of the electrospun nanofiber fabric 22 is 0.1 μm.

[0061] Alternatively, the relationship between the fiber diameters of the electrospun nanofiber fabric 22 and the melt-blown nonwoven fabric 21 can also be calculated by the following formula:

[0062] x = y 2 - 10.6y + 6.05;

[0063] x is the fiber diameter of the melt-blown nonwoven fabric 21; y is the fiber diameter of the electrospun nanofiber fabric 22.

[0064] Preferably, the fiber diameter of the melt-blown nonwoven fabric 21 is 5 μm, and the fiber diameter of the electrospun nanofiber fabric 22 is 0.1 μm.

[0065] From the above two calculation methods, it can be seen that if the fiber diameter of the melt-blown nonwoven fabric 21 approaches the maximum value, the fiber diameter of the electrospun nanofiber fabric 22 approaches the minimum value to facilitate cooperation in filtration efficiency.

[0066] Further, the filtration efficiency of the melt-blown non-woven fabric for particles with a size of 0.02 - 10 μm ranges from 80% to 96%, the filtration efficiency of the electrospun nanofiber fabric for particles with a size of 0.02 - 10 μm ranges from 70% to 93%, and the filtration efficiency value of the melt-blown non-woven fabric 21 for particles with a size of 0.02 - 10 μm is 1.05 - 1.6 times that of the electrospun nanofiber fabric 22.

[0067] Further, the gram weight of the melt-blown non-woven fabric 21 is: 10 - 40; the gram weight of the electrospun nanofiber fabric 22 is: 0.05 - 0.5.

[0068] Further, the porosity of the electrospun nanofiber fabric 22 is 1.10 - 1.29 times that of the melt-blown non-woven fabric 21, and the porosity of the melt-blown non-woven fabric is 70 - 90%.

[0069] In a specific embodiment, it is set that the filtration device 2 includes an electrospun nanofiber fabric 22 and a melt-blown non-woven fabric 21. The melt-blown non-woven fabric 21 is disposed on one side of the electrospun nanofiber fabric 22 to support the electrospun nanofiber fabric 22, and the melt-blown non-woven fabric 21 and the electrospun nanofiber fabric 22 form a two-layer filtration structure. The gram weight of the melt-blown non-woven fabric 21 is 30, and the gram weight of the electrospun nanofiber fabric 22 is 0.3. The filtration efficiency of the melt-blown non-woven fabric for particles with a size of 0.02 - 10 μm is 93%, and the filtration efficiency of the electrospun nanofiber fabric for particles with a size of 0.02 - 10 μm is 72%. The porosity of the melt-blown non-woven fabric is 80%, and the porosity of the electrospun nanofiber fabric 22 is 92%.

[0070] In the above specific embodiment, the fiber diameter of the melt-blown non-woven fabric is 1 - 5 μm, and the fiber diameter of the electrospun nanofiber fabric is 0.1 - 0.5 μm. Taking the fiber diameters of the melt-blown non-woven fabric and the electrospun nanofiber fabric as variables, various combinations as shown in Table I can be obtained:

[0071] Melt-blown non-woven fabric Electrospun nanofiber fabric The first combination Fiber diameter 1μm 0.5μm The second combination Fiber diameter 3μm 0.16μm The third combination Fiber diameter 5μm 0.1μm The fourth combination Fiber diameter 6μm 0.6μm The fifth combination Fiber diameter 0.5μm 0.01μm

[0072] As can be seen from Table I, the data of the first combination to the third combination are respectively within the scope of this embodiment; the fourth combination and the fifth combination exceed the scope of this embodiment and are used as the control group.

[0073] In this embodiment, the combination schemes pointed out in Table I are respectively constituted into five different embodiments. Under the standard of GB / T 32610 - 2016, the filtration efficiency for saline aerosol and the saline filtration resistance are respectively tested. The test data of each scheme in this embodiment are the averages obtained from testing 10 samples. The test results are shown in Table II:

[0074]

[0075] Specific principle analysis: If the fiber diameter of the melt-blown non-woven fabric 21 is relatively large, its pore size will be relatively large, and the physical barrier effect will be weak (even if there is an electrostatic adsorption effect caused by electret, a physical barrier effect must be used in combination to achieve the best filtration efficiency). At this time, if the fiber diameter of the electrospun nanofiber cloth 22 used in combination is not considered, or the fiber diameter of the electrospun nanofiber cloth 22 is also relatively large, such as in Comparative Scheme 1, the filtration device formed by the combination of the two will not meet the filtration efficiency standard, and the effect of such a combination will be far less than expected; while if specifically, the fiber diameter of the electrospun nanofiber cloth 22 used in combination is coordinated with the fiber diameter of the melt-blown non-woven fabric 21 to obtain the fiber diameter of the electrospun nanofiber cloth 22, the defect of the melt-blown non-woven fabric 21 in terms of physical barrier can be compensated for.

[0076] On the contrary, if the fiber diameters of the melt-blown non-woven fabrics 21 are all relatively small, such as in Comparative Scheme 2, the pore sizes will be relatively small, and the physical barrier effect will be relatively ideal. At this time, if the fiber diameter of the electrospun nanofiber cloth 22 used in combination is not considered, or the diameter of the electrospun nanofiber cloth 22 is also relatively small, the breathing resistance after the two are combined will be too large, resulting in a serious decline in application value. In the present invention, the fiber diameter of the electrospun nanofiber cloth 22 used in combination is coordinated with the fiber diameter of the melt-blown non-woven fabric 21 to obtain the fiber diameter of the electrospun nanofiber cloth 22, which can improve the breathing resistance to the greatest extent while achieving an increase in filtration efficiency.

[0077] Combined with Table I and Table II, it can be seen that by comparing Embodiments 1 to 3, at this time, coordinating the fiber diameter of the electrospun nanofiber cloth 22 used in combination with the fiber diameter of the melt-blown non-woven fabric 21 can improve the filtration effect on the premise of ensuring air permeability. In the above Table I and Table II, compared with the national standard GB / T 32610-2016 for daily protective masks, it can be clearly seen that Embodiments 1 to 3 are stable in terms of the filtration efficiency of saline aerosol and the saline filtration resistance, and improve the filtration effect on the premise of ensuring air permeability. If the optimal combination is selected, the effect of Embodiment 3 is relatively balanced and can be used as the optimal combination.

[0078] Example 2

[0079] See the attached Figure 1-4, a mask with an electrospun nanofiber cloth 22, including a mask body 1 and a filtering device 2. The mask body 1 includes an outer layer 11 and an inner layer 12. In this embodiment, the inner layer 12 and the outer layer 11 are non-woven fabrics. The inner layer 12 is used to fit the user's face, and the filtering device 2 is arranged between the inner layer 12 and the outer layer 11. Specifically, the filtering device 2 includes an electrospun nanofiber cloth 22 and a melt-blown non-woven fabric 21, and the melt-blown non-woven fabric 21 is arranged on the inner side of the electrospun nanofiber cloth 22 to support the electrospun nanofiber cloth 22.

[0080] As Figure 2 shown, the surface of the electrospun nanofiber cloth 22 in this embodiment has a spider-web-like microporous structure, with very complex changes such as network connectivity, pore nesting, and pore channel bending in the three-dimensional structure, making it have excellent surface filtration performance.

[0081] Figure 2 is the fiber structure diagram of the melt-blown non-woven fabric 21 and the electrospun nanofiber cloth 22 in a stacked state. In Figure 2 , the thick fibers below are the fibers of the melt-blown non-woven fabric 21, and the thin fibers and bead-like structures above are the fiber structure of the electrospun nanofiber cloth 22.

[0082] The filtration efficiency value of the melt-blown non-woven fabric 21 for particles with a diameter of 0.02 - 10 μm is 1.05 - 1.6 times that of the electrospun nanofiber cloth 22.

[0083] Furthermore, the relationship between the fiber diameters of the electrospun nanofiber cloth and the melt-blown non-woven fabric satisfies an inverse proportional function relationship, as follows:

[0084] y = 0.5 / x;

[0085] x is the fiber diameter of the melt-blown non-woven fabric 21;

[0086] y is the fiber diameter of the electrospun nanofiber cloth 22.

[0087] Preferably, the fiber diameter of the melt-blown non-woven fabric 21 is 5 μm, and the fiber diameter of the electrospun nanofiber cloth 22 is 0.1 μm.

[0088] Alternatively, the relationship between the fiber diameters of the electrospun nanofiber cloth 22 and the melt-blown non-woven fabric 21 can also be calculated by the following formula:

[0089] x = y 2 - 10.6y + 6.05;

[0090] x is the fiber diameter of the melt-blown non-woven fabric 21; y is the fiber diameter of the electrospun nanofiber cloth 22.

[0091] Preferably, the fiber diameter of the melt-blown nonwoven fabric 21 is 5 μm, and the fiber diameter of the electrospun nanofiber fabric 22 is 0.1 μm.

[0092] As can be seen from the above two calculation methods, if the fiber diameter of the melt-blown nonwoven fabric 21 approaches the maximum value, the fiber diameter of the electrospun nanofiber fabric 22 approaches the minimum value to facilitate cooperation in filtration efficiency.

[0093] The mask of this embodiment with the electrospun nanofiber fabric 22 further includes a strap 3: the strap 3 is used to hold the mask body 1 on the user's face. Preferably, the strap 3 includes an ear-hanging type, a strap type, or a head-loop type.

[0094] In this embodiment, the mask body 1 includes a flat type or a three-dimensional type according to needs.

[0095] In a specific embodiment, it is set that the strap 3 is of the ear-hanging type and the mask body 1 is of the three-dimensional type. It is also set that the filtering device 2 includes the electrospun nanofiber fabric 22 and the melt-blown nonwoven fabric 21, and the melt-blown nonwoven fabric 21 is arranged on one side of the electrospun nanofiber fabric 22 to support the electrospun nanofiber fabric 22, and the melt-blown nonwoven fabric 21 and the electrospun nanofiber fabric 22 form a two-layer filtering structure. The gram weight of the melt-blown nonwoven fabric 21 is 30, and the gram weight of the electrospun nanofiber fabric 22 is 0.3. The filtration efficiency of the melt-blown nonwoven fabric for particles with a size of 0.02 - 10 μm is 93%, and the filtration efficiency of the electrospun nanofiber fabric for particles with a size of 0.02 - 10 μm is 72%. The porosity of the melt-blown nonwoven fabric is 80%, and the porosity of the electrospun nanofiber fabric 22 is 92%.

[0096] In the above specific embodiment, the fiber diameter of the melt-blown nonwoven fabric is 1 - 5 μm, and the fiber diameter of the electrospun nanofiber fabric is 0.1 - 0.5 μm. Taking the fiber diameters of the melt-blown nonwoven fabric and the electrospun nanofiber fabric as variables, various combinations as shown in Table III can be obtained:

[0097] Melt-blown non-woven fabric Electrospun nanofiber fabric The sixth combination Fiber diameter 1μm 0.5μm The seventh combination Fiber diameter 3μm 0.16μm The eighth combination Fiber diameter 5μm 0.1μm The ninth combination Fiber diameter 6μm 0.6μm The tenth combination Fiber diameter 0.5μm 0.01μm

[0098] As can be seen from Table III, the data of the sixth combination to the eighth combination are respectively within the scope of this embodiment; the ninth combination and the tenth combination exceed the scope of this embodiment and are used as the control groups.

[0099] In this embodiment, the sixth combination scheme to the tenth combination scheme are allocated to form the inner layer and the outer layer of the mask. It is set that the inner layer is a nonwoven fabric and the outer layer is a nonwoven fabric, and then the implementation scheme 4, the implementation scheme 5, the implementation scheme 6, the comparative scheme 3, and the comparative scheme 4 are respectively constituted.

[0100] Further, tests were carried out separately under the standard of GB / T 32610-2016: the filtration efficiency of saline aerosol and the saline filtration resistance were tested. In this embodiment, the test data of each scheme are the average values obtained from the tests of 10 samples, and the test results are shown in Table IV:

[0101]

[0102] Specific principle analysis: If the fiber diameter of the melt-blown non-woven fabric 21 is relatively large, then its pore size is relatively large, and the physical barrier effect is relatively weak (even if there is an electrostatic adsorption effect caused by electret, it is necessary to have a physical barrier effect to cooperate to achieve the best filtration efficiency). At this time, if the fiber diameter of the electrospun nanofiber cloth 22 used in combination is not considered, or the fiber diameter of the electrospun nanofiber cloth 22 is also relatively large, such as in Comparative Scheme 3, the filtration device formed by the combination of the two will not meet the standard in terms of filtration efficiency, and the effect of such a combination will be far less than expected; and if specifically, the fiber diameter of the electrospun nanofiber cloth 22 used in combination is matched with the fiber diameter of the melt-blown non-woven fabric 21, and the fiber diameter of the electrospun nanofiber cloth 22 is obtained, the defect of the melt-blown non-woven fabric 21 in terms of physical barrier can be made up for.

[0103] On the contrary, if the fiber diameters of the melt-blown non-woven fabrics 21 are all relatively small, such as in Comparative Scheme 4, then the pore sizes are all relatively small, and the physical barrier effect will be relatively ideal. At this time, if the fiber diameter of the electrospun nanofiber cloth 22 used in combination is not considered, or the diameter of the electrospun nanofiber cloth 22 is also relatively small, then the breathing resistance after the two are added will be too large, resulting in a serious decline in application value. Only by matching the fiber diameter of the electrospun nanofiber cloth 22 used in combination with the fiber diameter of the melt-blown non-woven fabric 21, and obtaining the fiber diameter of the electrospun nanofiber cloth 22, can the breathing resistance be improved to the greatest extent while the filtration efficiency is improved.

[0104] Combining Table III and Table IV, it can be seen that by comparing Embodiments 4 to 6, matching the fiber diameter of the electrospun nanofiber cloth 22 used in combination with the fiber diameter of the melt-blown non-woven fabric 21 can improve the filtration effect on the premise of ensuring air permeability. In the above Table III and Table IV, compared with the national standard GB / T 32610-2016 for daily protective masks, it can be clearly seen that Embodiments 4 to 6 are stable in terms of the filtration efficiency of saline aerosol and the saline filtration resistance, and the exhalation resistance and inhalation resistance are significantly lower than the above standards, improving the filtration effect on the premise of ensuring air permeability. If the optimal combination is selected, the effect of Embodiment 6 is more balanced and can be used as the optimal combination.

[0105] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A filtering device with an electrospun nanofiber cloth, characterized in that, it includes: an electrospun nanofiber cloth; a meltblown nonwoven fabric, which is arranged on at least one side of the electrospun nanofiber cloth and forms a filtering structure with two or more layers with the electrospun nanofiber cloth; The relationship between the fiber diameters of the electrospun nanofiber cloth and the meltblown nonwoven fabric shows an inverse correlation; If the fiber diameter of the meltblown nonwoven fabric increases, the fiber diameter of the electrospun nanofiber cloth decreases; The fiber diameter of the meltblown nonwoven fabric is 1-5 μm; The fiber diameter of the electrospun nanofiber cloth is 0.1-0.5 μm; The relationship between the fiber diameters of the electrospun nanofiber cloth and the meltblown nonwoven fabric satisfies the following formula: y = 0.5 / x, or x = y 2 -10.6y + 6.05; x is the fiber diameter of the meltblown nonwoven fabric; y is the fiber diameter of the electrospun nanofiber cloth; The porosity of the electrospun nanofiber cloth is 1.10-1.29 times that of the meltblown nonwoven fabric, and the porosity of the meltblown nonwoven fabric is 70-90%; The filtration efficiency of the meltblown nonwoven fabric for particles with a size of 0.02-10 μm ranges from 80% to 96%, and the filtration efficiency of the electrospun nanofiber cloth for particles with a size of 0.02-10 μm ranges from 70% to 93%, and the filtration efficiency of the meltblown nonwoven fabric for particles with a size of 0.02-10 μm is 1.05-1.6 times that of the electrospun nanofiber cloth.

2. A filtering device with an electrospun nanofiber cloth according to claim 1, characterized in that, the fiber diameter of the meltblown nonwoven fabric is 5 μm; the fiber diameter of the electrospun nanofiber cloth is 0.1 μm; or: the fiber diameter of the meltblown nonwoven fabric is 1 μm; the fiber diameter of the electrospun nanofiber cloth is 0.5 μm.

3. A filtering device with an electrospun nanofiber cloth according to claim 1, characterized in that, the grammage of the meltblown nonwoven fabric is: 10-40; the grammage of the electrospun nanofiber cloth is: 0.05-0.

5.

4. A filtering device with an electrospun nanofiber cloth according to claim 1, characterized in that, the meltblown nonwoven fabric is arranged on one side of the electrospun nanofiber cloth.

5. A mask with an electrospun nanofiber cloth, characterized in that, it includes: a mask body, including an inner layer and an outer layer, and the inner layer is used to fit the user's face; the filtering device according to any one of claims 1-3, which is arranged between the inner layer and the outer layer; the meltblown nonwoven fabric is arranged on at least one side of the electrospun nanofiber cloth to support the electrospun nanofiber cloth.

6. A mask with an electrospun nanofiber cloth according to claim 5, characterized in that, the inner layer includes a nonwoven fabric; and / or, the outer layer includes a nonwoven fabric.

7. A mask with an electrospun nanofiber cloth according to claim 5, characterized in that, it further includes a strap: the strap is used to hold the mask body on the user's face.

8. A mask with an electrospun nanofiber cloth according to claim 7, characterized in that: the belt body includes an ear-hanging type, a strap type or a pull-on type.

9. A mask with an electrospun nanofiber cloth according to claim 5, wherein the mask body includes a flat type or a three-dimensional type.

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