Nanofiber laminate using spacer, method for manufacturing same, and nanofiber filter including same

Abstract

Disclosed are a nanofiber laminate, a method for manufacturing same, and a nanofiber filter including same. The nanofiber laminate according to the present invention includes a plurality of nanofiber layers. In particular, the nanofiber laminate according to the present invention has a plurality of spacer particles disposed between a nanofiber layer and another nanofiber layer, and pores are formed around the plurality of spacer particles. Due to the pores formed around the plurality of spacer particles, an increase in pressure loss of the nanofiber filter can be reduced or suppressed.

Description

Nanofiber laminate using a spacer, method of manufacturing the same, and nanofiber filter including the same

[0001] The present invention relates to a nanofiber filter manufacturing technology.

[0002] More specifically, the present invention relates to a nanofiber laminate using a spacer.

[0003] In addition, the present invention relates to a method for manufacturing the nanofiber laminate using electrospinning.

[0004] In addition, the present invention relates to a nanofiber filter comprising the above-mentioned nanofiber laminate.

[0005] An air purifier is a device that improves indoor air quality by purifying polluted indoor air. Generally, air purifiers are equipped with multiple filters that filter out fine particles, such as airborne dust, bacteria, or viruses. Fiber filters are often included among these filters.

[0006] Nanofibers are utilized as fiber-type filter materials due to their excellent dust collection performance, and are also referred to as nanofiber filters.

[0007] Nanofibers are generally manufactured in a dense sheet form through electrospinning using an electrospinning device. The fiber diameter of nanofibers is typically very thin, typically less than 100 nm.

[0008] Meanwhile, in the case of nanofiber filters, the dense arrangement of very fine nanofibers can increase the amount of dust captured, thereby providing high physical dust collection efficiency. However, if nanofibers are densely arranged to improve physical dust collection efficiency, the amount of air passing through the nanofiber filter decreases, which can lead to increased pressure loss. Since increased pressure loss reduces the airflow of the air purifier, it becomes a factor that degrades the performance of the air purifier. Furthermore, increasing the motor rotation speed to account for the increased pressure loss can lead to problems such as increased power consumption or a shortened lifespan of components.

[0009] Therefore, it is necessary to address the problem of increased pressure loss in these nanofiber filters.

[0010] The problem that the present invention aims to solve is to provide a nanofiber laminate capable of suppressing an increase in pressure loss.

[0011] In addition, the problem that the present invention aims to solve is to provide a nanofiber filter in which a spacer is included in the nanofiber laminate to reduce the increase in pressure loss.

[0012] In addition, the problem that the present invention aims to solve is to provide a method for manufacturing a nanofiber laminate with improved pressure loss.

[0013] The objects of the present invention are not limited to those mentioned above, and other unmentioned objects and advantages of the present invention may be understood from the following description and will be more clearly understood by the embodiments of the present invention. Furthermore, it will be readily apparent that the objects and advantages of the present invention can be realized by the means and combinations thereof set forth in the claims.

[0014] A nanofiber laminate according to the present invention for solving the above problem comprises a plurality of nanofiber layers, a plurality of spacer particles are disposed between the nanofiber layers, and pores are formed around the plurality of spacer particles.

[0015] The above plurality of particles for spacers may include spherical particles, elliptical particles, or rod-shaped particles.

[0016] The above plurality of particles for spacers may include hollow beads or porous beads.

[0017] The above plurality of spacer particles may have an average size of 10 to 400 μm.

[0018] For example, the plurality of spacer particles mentioned above may have an average size of 40 to 60 µm. In this case, the plurality of spacer particles are 1 mm 2 It is desirable to include 100 to 250 pieces per day.

[0019] As another example, the plurality of spacer particles may have an average size of 140 to 160 μm. In this case, the plurality of spacer particles are 1 mm 2 It is desirable to include 4 to 25 per.

[0020] As another example, the plurality of spacer particles may include a first particle having a size of 100 μm or less and a second particle having a size exceeding 100 μm. Preferably, the plurality of spacer particles may include a first particle having an average size of 40 to 60 μm and a second particle having an average size of 140 to 160 μm.

[0021] It is preferable that the plurality of spacer particles between the nanofiber layers be included in an area of ​​35% or less of the nanofiber layer area.

[0022] The plurality of spacer particles mentioned above may be arranged randomly. Alternatively, the plurality of spacer particles may be arranged uniformly at predetermined intervals.

[0023] At least one of the plurality of nanofiber layers can be arranged in a uniaxial direction.

[0024] At least one of the plurality of nanofiber layers can be arranged in two or more axes.

[0025]

[0026] In addition, a nanofiber laminate according to another embodiment of the present invention for solving the above problem comprises a plurality of nanofibers, a plurality of spacer particles are disposed between the nanofibers, and pores are formed around the plurality of spacer particles.

[0027] The above plurality of particles for spacers may include spherical particles, elliptical particles, or rod-shaped particles.

[0028] The above plurality of particles for spacers may include hollow beads or porous beads.

[0029] The above plurality of spacer particles may have an average size of 10 to 400 μm.

[0030] For example, the plurality of spacer particles mentioned above may have an average size of 40 to 60 µm. In this case, the plurality of spacer particles are 1 mm 2 It is desirable to include 100 to 250 pieces per day.

[0031] As another example, the plurality of spacer particles may have an average size of 140 to 160 μm. In this case, the plurality of spacer particles are 1 mm 2 It is desirable to include 4 to 25 per.

[0032] As another example, the plurality of spacer particles may include a first particle having a size of 100 μm or less and a second particle having a size exceeding 100 μm. Preferably, the plurality of spacer particles may include a first particle having an average size of 40 to 60 μm and a second particle having an average size of 140 to 160 μm.

[0033] It is preferable that multiple spacer particles arranged in the same layer be included in an area of ​​35% or less of the nanofiber laminate.

[0034] The plurality of spacer particles mentioned above may be arranged randomly. Alternatively, the plurality of spacer particles may be arranged uniformly at predetermined intervals.

[0035] At least some of the above plurality of nanofibers may be arranged in a uniaxial direction.

[0036] At least some of the above plurality of nanofibers may be arranged in two or more axes.

[0037] A nanofiber laminate according to the present invention for solving the above problem comprises the aforementioned nanofiber laminate and a support that supports the nanofiber laminate.

[0038] A method for manufacturing a nanofiber laminate according to the present invention for solving the above problem includes the step of forming a plurality of nanofiber layers through electrospinning, and spraying a plurality of spacer particles during electrospinning so that a plurality of spacer particles are disposed between the nanofiber layers.

[0039] The above plurality of particles for spacers may include spherical particles, elliptical particles, or rod-shaped particles.

[0040] The above plurality of particles for spacers may include hollow beads or porous beads.

[0041] The above plurality of spacer particles may have an average size of 10 to 400 μm.

[0042] The above plurality of particles for spacers can be arranged randomly.

[0043] The above plurality of spacer particles can be uniformly arranged at predetermined intervals.

[0044] At least one of the plurality of nanofiber layers can be arranged in one or more directions.

[0045] To increase the dust collection effect of the filter, a nanofiber filter with small-diameter fibers arranged densely is required. However, there is a problem in that the pressure loss of the filter increases significantly as the small-diameter fibers are arranged more densely.

[0046] The nanofiber laminate and nanofiber filter according to the present invention can improve pressure loss while maintaining dust collection efficiency by arranging various types of spacer particles between the fiber layers. This resolves the problem of increased pressure loss of nanofibers and secures a space for capturing dust.

[0047] Consequently, the nanofiber laminate and nanofiber filter according to the present invention can lead to an increase in the cumulative purification amount, thereby increasing the lifespan of the nanofiber filter.

[0048] Furthermore, various functional powders can be used as spacer particles, so depending on the type of particle, oil / moisture removal efficiency can be improved, or new or unique functions can be imparted to the nanofiber filter.

[0049] In addition to the effects described above, the specific effects of the present invention are described together with the specific details for implementing the invention below.

[0050] Figure 1 schematically shows a nanofiber filter according to the prior art.

[0051] FIG. 2 schematically shows a nanofiber filter according to an embodiment of the present invention.

[0052] FIGS. 3a and 3b schematically illustrate nanofiber laminates according to embodiments of the present invention, where FIG. 3a shows an example in which nanofiber layers are arranged in a uniaxial direction, and FIG. 3b shows an example in which nanofiber layers are arranged in two or more axial directions.

[0053] FIGS. 4a and 4b schematically illustrate nanofiber laminates according to other embodiments of the present invention, where FIG. 4a shows an example with a high number concentration of spacer particles and FIG. 4b shows an example with a low number concentration of spacer particles.

[0054] FIGS. 5A and 5B schematically illustrate nanofiber laminates according to another embodiment of the present invention, FIG. 5A shows an example in which the sizes of the particles for the spacer vary, and FIG. 5B shows an example in which the sizes of the nanofibers vary.

[0055] FIG. 6 schematically illustrates nanofiber laminates according to another embodiment of the present invention, showing an example in which some of the particles for the spacer are functional particles.

[0056] FIG. 7 schematically illustrates nanofiber laminates according to another embodiment of the present invention, showing an example in which the particles for the spacer are porous.

[0057] Figure 8 schematically shows an example of a nanofiber spinning nozzle according to the prior art.

[0058] FIG. 9 schematically illustrates an example of a nanofiber spinning nozzle according to an embodiment of the present invention.

[0059] FIG. 10 schematically illustrates examples of various radiating nozzles that can be applied to the present invention.

[0060] Figure 11 shows the cumulative purification amount according to water concentration when average 50㎛ glass beads are applied as spacer particles.

[0061] Figure 12 shows the cumulative purification amount according to water concentration when glass beads with an average of 150 μm are applied as particles for spacers.

[0062] Figure 13 shows the cumulative purification amount according to water concentration when average 50㎛ glass beads and average 150㎛ glass beads are applied together as particles for spacers.

[0063] The aforementioned objectives, features, and advantages are described in detail below with reference to the attached drawings, thereby enabling those skilled in the art to easily implement the technical concept of the present invention. In describing the present invention, detailed descriptions of known technologies related to the present invention are omitted if it is determined that such descriptions would unnecessarily obscure the essence of the invention. Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the attached drawings. In the drawings, the same reference numerals are used to indicate the same or similar components.

[0064] In the following, the statement that any configuration is placed on the "upper (or lower)" of a component or on the "upper (or lower)" of a component may mean not only that any configuration is placed in contact with the upper (or lower) surface of said component, but also that another configuration may be interposed between said component and any configuration placed on (or below) said component.

[0065] In addition, where it is stated that one component is "connected," "combined," or "connected" to another component, it should be understood that while the components may be directly connected or connected to each other, another component may be "interposed" between each component, or each component may be "connected," "combined," or "connected" through another component.

[0066] Hereinafter, a nanofiber laminate using a spacer according to some embodiments of the present invention, a method for manufacturing the same, and a nanofiber filter including the same will be described.

[0067] Figure 1 schematically shows a nanofiber filter according to the prior art.

[0068] Referring to FIG. 1, a nanofiber filter according to the prior art includes a support (110) and a nanofiber layer (120).

[0069] In the case of a conventional nanofiber filter, the nanofiber layer (120) has a single layer or a multilayer structure. A single-layer nanofiber layer can be obtained through a single nano-spinning process. A multilayer nanofiber layer can be obtained by performing the same nano-spinning process multiple times.

[0070] In a nanofiber filter according to the prior art, both the single-layer nanofiber layer and the multi-layer nanofiber layer are formed such that nanofibers are stacked in layers according to the thickness of the fabric fiber. In this case, the porosity of the nanofiber layer (120) is small, and accordingly, the pressure loss increases when using the filter.

[0071] FIG. 2 schematically shows a nanofiber filter according to an embodiment of the present invention.

[0072] Referring to FIG. 2, a nanofiber filter according to an embodiment of the present invention includes a support (210) and a nanofiber laminate.

[0073] The support (210) can be made of various materials such as PP (Polypropylene), PE (Polyethylene), PET (Polyethylene terephthalate), PES (Polyethersulfone), or PA (Polyamide).

[0074] The nanofiber laminate comprises a plurality of nanofiber layers (220). In the following, reference numeral 220 refers to a nanofiber layer, but also refers to a nanofiber constituting the nanofiber layer.

[0075] Various materials such as PAN (Polyacrylonitrile), PES (Polyethersulfone), PA (Polyamide), and PVDF (Polyvinylidene fluoride) can be used as raw materials for nanofibers.

[0076] Each nanofiber layer may be composed of long fibers and / or short fibers. Additionally, multiple nanofiber layers may be formed into one or more nanofiber webs in which nanofibers are stacked in layers.

[0077] The nanofibers used in the present invention may, for example, have a diameter of 100 nm or less, but are not necessarily limited thereto. That is, the nanofibers that can be used in the present invention may have a diameter of 100 nm or more, for example, nanofibers with a diameter of several hundred nm.

[0078] In the case of the present invention, a plurality of spacer particles (230) are disposed between the nanofiber layer (220) and the nanofiber layer (220). That is, in the case of the present invention, a plurality of nanofiber layers are included, and a plurality of spacer particles are disposed between the nanofiber layers. To express this differently, in the case of the present invention, a plurality of nanofibers are included, and a plurality of spacer particles are disposed between the nanofibers.

[0079] The spacer particles (230) can be made of various materials such as polymers, ceramics, and metals. It is preferable to use lightweight materials such as glass beads or polymer beads in order to suppress breakage caused by nanofibers due to the weight of the spacer particles (230).

[0080] In the case of the present invention, as shown in the example illustrated in FIG. 2, pores (225) are formed around a plurality of spacer particles (230) by a plurality of spacer particles (230) disposed between the nanofiber layer (220) and the nanofiber layer (220).

[0081] Pores (225) formed around a plurality of spacer particles (230) can serve to suppress pressure loss when using a nanofiber filter. Specifically, the spacing between nanofiber layers (220) can be increased by the plurality of spacer particles (230). That is, by placing spacer particles (230) between dense nanofibers, space can be secured at least around the spacer particles (230). Accordingly, pressure loss caused by dense nanofibers can be reduced, and the space and thickness of the fiber fabric itself can be increased, thereby increasing the space in which dust and the like can be collected.

[0082] The size of the pores (225) or the density of the pores (225) can be adjusted according to the number and size of the particles for the spacers.

[0083] The plurality of spacer particles (230) may include spherical particles, elliptical particles, or rod-shaped particles. In addition, various other shapes of spacer particles may be used.

[0084] Multiple spacer particles (230) may include hollow beads or porous beads. When spacer particles are added, the weight of the filter increases accordingly, but when such hollow beads or porous beads are applied, the increase in the weight of the filter can be minimized.

[0085] The above plurality of spacer particles may preferably have an average size of about 10 to 400 μm. If the average size of the plurality of spacer particles is less than about 10 μm, the pore enlargement effect may be insufficient, and consequently, the pressure loss improvement effect may be insufficient. Conversely, if the average size of the plurality of spacer particles exceeds about 400 μm, the nanofibers may not be uniformly spun onto the plurality of spacer particles due to the excessive particle size, and thus the efficiency may be reduced.

[0086] For example, multiple spacer particles may have an average size of 40 to 60 µm. In this case, the multiple spacer particles are 1 mm 2 It is desirable to include 100 to 250 pieces per day.

[0087] As another example, multiple spacer particles may have an average size of 140 to 160 µm. In this case, the multiple spacer particles are 1 mm 2 It is desirable to include 4 to 25 per.

[0088] As described above, the preferred number concentration of multiple spacer particles may vary depending on the average size of the multiple spacer particles.

[0089] Additionally, the plurality of spacer particles may include a first particle having a size of 100 μm or less and a second particle having a size exceeding 100 μm. Preferably, the plurality of spacer particles may include a first particle having an average size of 40 to 60 μm and a second particle having an average size of 140 to 160 μm.

[0090] It is preferable that the plurality of spacer particles disposed between the nanofiber layers be included in an area of ​​35% or less of the nanofiber layer area. That is, it is preferable that the plurality of spacer particles disposed in the same layer be included in an area of ​​35% or less of the nanofiber laminate area. If the area occupied by the plurality of spacer particles is too large, filter damage may occur due to weight.

[0091] FIGS. 3a and 3b schematically illustrate nanofiber laminates according to embodiments of the present invention, where FIG. 3a shows an example in which nanofiber layers are arranged in a uniaxial direction, and FIG. 3b shows an example in which nanofiber layers are arranged in two or more axial directions.

[0092] At least one of the plurality of nanofiber layers may have nanofibers (220) arranged in a uniaxial direction, for example, in the x-axis direction of FIG. 3a, as shown in the example of FIG. 3a.

[0093] As another example, at least one of the multiple nanofiber layers may have nanofibers (220) arranged in two or more axes, as in the example shown in FIG. 3b. In this case, some of the nanofibers (220) may be arranged in the x-axis direction and some of the nanofibers (220) may be arranged in the y-axis direction.

[0094] Furthermore, a plurality of spacer particles (230) may be uniformly arranged at predetermined intervals. Alternatively, a plurality of spacer particles (230) may be randomly arranged.

[0095] FIGS. 4a and 4b schematically illustrate nanofiber laminates according to other embodiments of the present invention, where FIG. 4a shows an example with a high number concentration of spacer particles and FIG. 4b shows an example with a low number concentration of spacer particles.

[0096] Pore ​​density or pore size may vary depending on the average size of multiple spacer particles. Accordingly, the desirable number concentration (number of spacer particles per unit area) of multiple spacer particles may vary depending on the average size of multiple spacer particles.

[0097] FIGS. 5A and 5B schematically illustrate nanofiber laminates according to another embodiment of the present invention, FIG. 5A shows an example in which the sizes of the particles for the spacer vary, and FIG. 5B shows an example in which the sizes of the nanofibers vary.

[0098] The size of the spacer particles and the size of the nanofibers can be determined as needed. The spacer particles (230) may be of a constant size. Alternatively, as shown in the example illustrated in FIG. 5a, two or more types of spacer particles (230) may coexist, such as large-sized spacer particles (230a), medium-sized spacer particles (230b), and small-sized spacer particles (230c).

[0099] The nanofibers (220) may also have a constant diameter. Alternatively, as shown in the example in FIG. 5b, the nanofibers (220) may have a small diameter nanofiber (220a) and a large diameter nanofiber (220b) coexisting.

[0100] FIG. 6 schematically illustrates nanofiber laminates according to another embodiment of the present invention, showing an example in which some of the particles for the spacer are functional particles.

[0101] The particles labeled 230d in FIG. 6 may be particles for spacers for pressure drop improvement. The particles labeled 230e in FIG. 6 may be functional particles for imparting other functionality instead of pressure drop improvement, or functional particles for imparting other functionality along with pressure drop improvement.

[0102] By imparting functionality to particle spacers, they can also serve as various functional composite fabrics and filters specialized for oil vapor, solid dust, moisture, allergens, and deodorizing substances. This extends the expected lifespan of the filter and increases the cumulative capture capacity, which can also help improve airflow in the HVAC system.

[0103] Examples of functional particles (230e) may include particles having deodorizing functionality, particles capable of selectively or simultaneously removing solid or gaseous particles, and various other functional particles may be applied.

[0104] FIG. 7 schematically illustrates nanofiber laminates according to another embodiment of the present invention, showing an example where the particles for the spacers are porous or hollow particles.

[0105] The particles indicated by reference numeral 230f in FIG. 7 may be porous or hollow particles.

[0106] As shown in the example illustrated in FIG. 7, in the case of porous or hollow spacer particles (230f), the weight of the spacer particles can be reduced, thereby providing the effect of securing a spatial structure between nanofiber layers without damaging the nanofibers.

[0107] As shown in the example illustrated in FIG. 7, only porous or hollow spacer particles (230f) may be used. As another example, porous or hollow spacer particles (230f) and non-porous or non-hollow spacer particles may be used together.

[0108] The nanofiber laminate and nanofiber filter according to the present invention may be formed by a method comprising the step of forming a plurality of nanofiber layers through electrospinning, wherein a plurality of spacer particles are sprayed during electrospinning so that a plurality of spacer particles are disposed between the nanofiber layers.

[0109] The nanofibers (220) of the nanofiber laminate and nanofiber filter can be formed through electrospinning. Spacer particles (230) can be placed on the nanofibers (220) by methods such as simultaneous scattering in air, electrostatic spraying, or bead-on-string. In terms of productivity, scattering the spacer particles in air during electrospinning is the most preferable method.

[0110] Hereinafter, with reference to FIGS. 8 to 10, an apparatus and method for manufacturing a nanofiber laminate and a nanofiber filter including particles for spacers will be described. In FIGS. 8 to 10, nanofibers are formed through electrospinning, and particles for spacers are placed on the nanofibers using a simultaneous scattering method in air.

[0111] Meanwhile, the inclusion of inorganic particles in the electrospinning solution for manufacturing nanofibers can be considered. However, since the nanofibers and inorganic particles constitute part of the nanofibers, it is difficult for them to function as spacers.

[0112] Accordingly, in the present invention, spacer particles are directly sprayed, that is, scattered into the air, separately from the electrospinning solution, so that spacer particles are placed between nanofibers or nanofibers are placed on top of spacer particles. Due to the presence of these spacer particles, it is difficult to arrange nanofibers densely at least in the parts where the spacer particles are present; therefore, pores exist near the spacers in the nanofiber laminate according to the present invention. The presence of these pores allows for the smooth passage of air, and thus can contribute to suppressing an increase in pressure loss.

[0113] FIG. 8 schematically illustrates an example of a nanofiber spinning nozzle according to the prior art. FIG. 9 schematically illustrates an example of a nanofiber spinning nozzle according to an embodiment of the present invention.

[0114] A nanofiber spinning nozzle according to the present invention comprises a pair of spinning nozzles (910). Nanofibers can be spun through the tips (915) of the pair of spinning nozzles (910). A polymer solution supplied to the nanofiber spinning nozzles can be formed into droplets at the tips (915) of the nozzles. This allows the pair of spinning nozzles (810) and tips (815) of a conventional nanofiber spinning nozzle to be used as is.

[0115] Additionally, the nanofiber spinning nozzle according to the present invention includes a spinning plate (920) on which nanofibers are accumulated. A support may be disposed on the spinning plate (920). The spinning plate (920) may be charged with opposite polarity to a pair of spinning nozzles (910) or connected to ground. In this case, the existing spinning plate (820) may also be used as is.

[0116] For example, a high voltage (+HV) of 20 kV or more may be applied to the radiation nozzle (910), and a high voltage (-HV) of -12 kV may be applied to the radiation plate (920).

[0117] The distance between the tip (915) of the spinning nozzle (910) and the spinning plate (920) can be determined by the voltage applied to the spinning nozzle (910) or the voltage difference between the spinning nozzle (910) and the spinning plate (920). When an electric field greater than the surface tension of the droplet generated at the tip (915) of the nozzle is formed between the spinning nozzle (910) and the spinning plate (920), the droplet can be ejected from the spinning nozzle (910) toward the spinning plate (920) as a nanofiber having a diameter of tens to hundreds of nanometers. Accordingly, the nanofibers ejected from the spinning nozzle (910) can be attached to the spinning plate (920). At this time, since the spinning plate (920) can function as a corresponding electrode of the spinning nozzle (910), the nanofibers can be attached more strongly to the spinning plate (920) due to the enhanced electrical effect.

[0118] Meanwhile, the nanofiber spinning nozzle according to the present invention illustrated in FIG. 9 is provided with a spacer particle injection nozzle (930) as shown in FIG. 8, unlike the one illustrated in FIG. 8. Through this spacer particle injection nozzle (930), spacer particles can be placed between nanofiber layers and pores can be formed around the spacer particles.

[0119] Meanwhile, the particle injection nozzle (930) for the spacer can be positioned higher than the tip (915) of the radiating nozzle (910). This facilitates the control of scattering of the particles for the spacer, allowing the particles for the spacer to be distributed more uniformly.

[0120] FIG. 10 schematically illustrates examples of various radiating nozzles that can be applied to the present invention.

[0121] Referring to FIG. 10, the spinning nozzle may include a nanofiber spinning nozzle (1010) and a spacer particle spray nozzle (1020a, 1020b, 1020c). The nanofiber spinning nozzle (1010) and the spacer particle spray nozzle (1020a, 1020b, 1020c) do not exist on the same plane, and, for example, the spacer particle spray nozzle (1020a, 1020b, 1020c) may be located at a higher position. FIG. 10(a) shows an example in which the spacer particle spray nozzle is in the form of a plurality of slits. FIG. 10(b) shows an example in which four nozzles (1020b) are provided to spray into four zones. FIG. 10(c) shows an example in which spray is applied over the entire area by a single nozzle (1020c). Each nozzle (1020a, 1020b, 1020c) illustrated in FIG. 10 (a) to (c) may correspond to the particle injection nozzle (930) for the spacer in FIG. 9. The particle injection nozzles for the spacer (1020a, 1020b, 1020c) may be arranged in various forms depending on the injection area, surface area, particle size, etc.

[0122] In the case exemplified in FIG. 10 (a), a plurality of particle spray nozzles (1020a) for spacers are arranged at regular intervals, which is advantageous for uniform emission of particles for spacers. In the case exemplified in FIG. 10 (c), a single particle spray nozzle (1020c) for spacers may be used, which can simplify the configuration of the device. When a plurality of particle spray nozzles (1020b) for spacers are used as exemplified in FIG. 10 (b), an effect between FIG. 10 (a) and FIG. 10 (c) can be obtained.

[0123] Figure 11 shows the cumulative purification amount according to water concentration when average 50㎛ glass beads are applied as spacer particles. Figure 12 shows the cumulative purification amount according to water concentration when average 150㎛ glass beads are applied as spacer particles. Figure 13 shows the cumulative purification amount according to water concentration when average 50㎛ glass beads and average 150㎛ glass beads are applied together as spacer particles.

[0124] Number concentration refers to the number (count) of glass beads contained in a specific volume or area.

[0125] The cumulative purification amount refers to the amount of dust removed when NaCl dust is injected consistently into a nanofiber laminate for 10 minutes using the TSI 8130A, a dust collection efficiency measuring device. In FIGS. 11 to 13, the cumulative purification amount is expressed as a relative value with the target amount of NaCl dust removal set to 100%. Additionally, in FIGS. 11 to 13, a cumulative purification amount of 5% is the result measured for a nanofiber laminate without spacer particles applied, and corresponds to a value relative to the aforementioned 100%. A cumulative purification amount of 10% means that the cumulative purification amount is twice that of the case where spacer particles are not applied. A cumulative purification amount of 35% means that the cumulative purification amount is seven times that of the case where spacer particles are not applied.

[0126] Referring to Figures 11 to 13, it is shown that, except for cases with low pressure loss, the cumulative purification amount is improved according to a specific water concentration regardless of particle size compared to the case where particles for the spacer are not applied (5%), and it can have a maximum cumulative purification amount of about 7 times.

[0127] Meanwhile, referring to FIGS. 11 to 13, the cumulative purification amount increases as the number concentration of spacer particles increases, but when it exceeds a certain value, the cumulative purification amount tends to decrease. This can be seen as the number concentration of spacer particles having almost no effect on the nanofibers up to a certain level, but if the number concentration of spacer particles and the resulting increase in weight become excessive, damage to the nanofibers occurs, causing the cumulative purification amount to decrease.

[0128] Although the present invention has been described above with reference to the illustrated drawings, the present invention is not limited by the embodiments and drawings disclosed in this specification, and it is obvious that various modifications can be made by a person skilled in the art within the scope of the technical concept of the present invention. Furthermore, even if the effects of the configuration according to the present invention were not explicitly described while describing the embodiments of the present invention above, it is natural to acknowledge that the effects predictable by said configuration should also be recognized.

[0129] <Explanation of Symbols>

[0130] 110 : Support

[0131] 120: Nanofiber layer

[0132] 210 : Support

[0133] 220 : Nanofiber layer (nanofiber)

[0134] 220a: Small-diameter nanofibers

[0135] 220b: Large-diameter nanofiber

[0136] 225 : Aircraft

[0137] 230: Particles for spacers

[0138] 230a: Large-sized particles for spacers

[0139] 230b: Medium-sized particles for spacers

[0140] 230c: Small-sized particles for spacers

[0141] 230d: Spacer particles

[0142] 230e: Functional particles

[0143] 230f: Porous or hollow particles

[0144] 810: Radiation nozzle

[0145] 815 : High-tech section

[0146] 820 : Radiation plate

[0147] 910: Radiation nozzle

[0148] 915 : High-tech section

[0149] 920 : Radiation plate

[0150] 930: Particle injection nozzle for spacers

Claims

1. Includes multiple nanofiber layers, Multiple spacer particles are arranged between the nanofiber layers, and A nanofiber laminate having pores formed around the plurality of spacer particles.

2. In Paragraph 1, The above plurality of spacer particles comprises a nanofiber laminate including spherical particles, elliptical particles, or rod-shaped particles.

3. In Paragraph 1, The above plurality of spacer particles comprise a nanofiber laminate including hollow beads or porous beads.

4. In Paragraph 1, The above plurality of spacer particles are a nanofiber laminate having an average size of 10 to 400 μm.

5. In Paragraph 4, The above plurality of spacer particles have an average size of 40 to 60 μm, and The above plurality of spacer particles are 1 mm 2 Nanofiber laminates containing 100 to 250 pieces per layer.

6. In Paragraph 4, The above plurality of spacer particles have an average size of 140 to 160 μm, and The above plurality of spacer particles are 1 mm 2 Nanofiber laminates containing 4 to 25 of each.

7. In Paragraph 4, A nanofiber laminate comprising a plurality of spacer particles, the plurality of spacer particles including a first particle having a size of 100 μm or less and a second particle having a size exceeding 100 μm.

8. In Paragraph 7, The above plurality of spacer particles comprises a first particle having an average size of 40 to 60 μm and a second particle having an average size of 140 to 160 μm, forming a nanofiber laminate.

9. In Paragraph 1, A nanofiber laminate in which a plurality of spacer particles between the nanofiber layers are included in an area of ​​35% or less of the nanofiber layer area.

10. In Paragraph 1, The above plurality of spacer particles are a randomly arranged nanofiber laminate.

11. In Paragraph 1, The above plurality of spacer particles are a nanofiber laminate uniformly arranged at predetermined intervals.

12. In Paragraph 1, A nanofiber laminate in which at least one of the plurality of nanofiber layers is arranged in a uniaxial direction.

13. In Paragraph 1, A nanofiber laminate in which at least one of the plurality of nanofiber layers is arranged in two or more axes.

14. A method for manufacturing a nanofiber laminate according to claim 1, A method for manufacturing a nanofiber laminate, comprising the step of forming a plurality of nanofiber layers through electrospinning, wherein a plurality of spacer particles are sprayed during electrospinning so that a plurality of spacer particles are disposed between the nanofiber layers.

15. In Paragraph 14, A method for manufacturing a nanofiber laminate, wherein the plurality of spacer particles include spherical particles, elliptical particles, or rod-shaped particles.

16. In Paragraph 14, A method for manufacturing a nanofiber laminate, wherein the plurality of spacer particles include hollow beads or porous beads.

17. In Paragraph 14, A method for manufacturing a nanofiber laminate, wherein the plurality of spacer particles have an average size of 10 to 400 μm.

18. In Paragraph 14, A method for manufacturing a nanofiber laminate in which the plurality of spacer particles are randomly arranged.

19. In Paragraph 14, A method for manufacturing a nanofiber laminate in which the plurality of spacer particles are uniformly arranged at predetermined intervals.

20. In Paragraph 1, A method for manufacturing a nanofiber laminate, wherein at least one of the plurality of nanofiber layers is arranged in one or more directions.

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