JP2012223254A - Radioactive material-blocking mask - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radioactive material-blocking mask which can separate/collect an material to which radioactive materials such as iodine 131 and cesium 137 adhere, and the steam of iodine including iodine 131, and can greatly decrease the amount of the entering radioactive materials (especially, iodine 131) in a human body.SOLUTION: The radioactive material-blocking mask includes: a mask body 1 which covers a nasal meatus; and a mounting member disposed in the mask body 1, wherein the mask body 1 includes: a micro fiber layer 10 including a micro fiber 12 in which the average fiber diameter is in the range of 1-100 μm; and a nano fiber layer 20 which is laminated on the micro fiber layer 10, and contains a nano fiber 22 in which the average fiber diameter is in the range of 10-3,000 nm, and the nano fiber 22 consists of polyvinyl alcohol.

Description

  The present invention relates to a radioactive substance blocking mask.

  Conventionally, a mask body covering a nostril and a mounting member disposed on the mask body, the mask body including a microfiber layer containing an inorganic porous material, and a nanofiber layer laminated on the microfiber layer, (For example, refer patent document 1).

  According to the conventional mask, since it has a microfiber layer and a nanofiber layer containing inorganic porous material, the microfiber layer adsorbs bacteria, viruses, fungi, etc. in the air and kills or inactivates these viruses. And the effect of collecting and removing these viruses from the air by the nanofiber layer. In addition, the nanofiber layer has high water repellency, and has the effect of allowing air and water vapor to pass through under atmospheric pressure, while preventing liquids such as organic solvents, disinfecting alcohol liquids, blood, and body fluids from penetrating.

  Therefore, the conventional mask can not only remove minute harmful particles such as dust, house dust, SPM and pollen, but also viruses floating in the air, various bacteria contained in blood, sputum, etc. It is possible to prevent various infectious diseases caused by viruses, fungi and the like. Furthermore, compared to conventional masks with multiple layers of non-woven fabrics, a thin nanofiber non-woven fabric layer can be used to reduce weight and improve air permeability. become.

JP 2008-188082 A

  By the way, in recent years, the risk of leakage of various radioactive materials into the external space has increased due to nuclear accidents, nuclear tests, radiological medical practices, etc., and so ordinary harmful substances (dust, house dust, SPM, pollen, etc.) Not only can you separate and remove harmful particles, viruses floating in the air, and various bacteria, viruses, fungi, etc. contained in blood and sputum, but also radioactive substances such as iodine 131 and cesium 137 are attached. It is necessary to have a radioactive substance blocking mask that can separate and collect the vapors of iodine and iodine containing iodine 131 and can greatly reduce the amount of radioactive substances (especially iodine 131) entering the human body. ing.

  Therefore, the present invention has been made in view of the above-described problems, and it is possible to separate and collect a substance to which a radioactive substance such as iodine 131 or cesium 137 is attached, or an iodine vapor containing iodine 131, An object of the present invention is to provide a radioactive substance blocking mask capable of greatly reducing the amount of radioactive substance (particularly iodine 131) entering the human body.

[1] The radioactive substance blocking mask includes a mask main body that covers the nose and a mounting member disposed on the mask main body, and the mask main body has a microfiber having an average fiber diameter in the range of 1 μm to 100 μm. A microfiber layer containing fibers, and a nanofiber layer containing nanofibers laminated on the microfiber layer and having an average fiber diameter in the range of 10 nm to 3000 nm, and the nanofibers are polyvinyl alcohol (PVA) It is characterized by comprising.

According to the radioactive substance blocking mask of the present invention, the mask body includes a microfiber layer including microfibers having an average fiber diameter in the range of 1 μm to 100 μm, and nanofibers having an average fiber diameter in the range of 10 nm to 3000 nm. Therefore, it is possible to efficiently separate and collect dust or dust to which radioactive substances such as iodine 131 and cesium 137 are attached.
Further, according to the radioactive substance blocking mask of the present invention, since the nanofiber is made of polyvinyl alcohol (PVA) having an iodine collecting effect, it is possible to separate and collect iodine vapor containing iodine 131.

  As a result, the radioactive substance blocking mask of the present invention can separate and collect substances with radioactive substances such as iodine 131 and cesium 137, and iodine vapor containing iodine 131, and enter the human body. It becomes a radioactive substance blocking mask capable of greatly reducing the amount of substance (particularly iodine 131).

  In the present invention, the average fiber diameter of the nanofibers is in the range of 10 nm to 3000 nm because it may be difficult to produce nanofibers when the average fiber diameter is smaller than 10 nm. This is because when the average fiber diameter is larger than 3000 nm, it may be difficult to separate and collect the dust or the dust to which the radioactive substance is attached from the viewpoint of the surface area and pores. From the above viewpoint, the average fiber diameter of the nanofibers is more preferably in the range of 50 nm to 500 nm.

  Moreover, in this invention, it is preferable that the layer thickness of a nanofiber layer exists in the range of 300 nm-5000 nm. This is because when the layer thickness is smaller than 300 nm, it may be difficult to sufficiently separate and collect iodine vapor containing iodine 131. When the layer thickness is larger than 5000 nm, This is because it may be difficult to reduce the manufacturing cost. From the above viewpoint, the thickness of the nanofiber layer is more preferably in the range of 800 nm to 2000 nm.

  In the radioactive substance blocking mask of the present invention, the microfiber layer has a certain degree of strength and serves as a mask by itself (that is, a generally distributed mask having no nanofiber layer) ) May be used.

  In the radioactive substance blocking mask of the present invention, when the bonding force between the microfiber layer and the nanofiber layer is small, an adhesive material (thermoplastic resin or the like) is provided between the microfiber layer and the nanofiber layer. You may further provide the contact bonding layer which consists of.

[2] In the radioactive substance blocking mask of the present invention, the nanofiber layer preferably further contains a substance that adsorbs iodine.

  By adopting such a configuration, it becomes possible to separate and collect the substance to which iodine 131 is adhered and iodine vapor containing iodine 131 with higher efficiency.

[3] In the radioactive substance blocking mask of the present invention, the substance that adsorbs iodine is preferably potassium iodide (KI).

  By adopting such a configuration, it becomes possible to separate and collect the substance to which iodine 131 is adhered and iodine vapor containing iodine 131 with higher efficiency.

[4] In the radioactive substance blocking mask of the present invention, the substance that adsorbs iodine is preferably boric acid (H ₃ BO ₃ ).

  Even with such a configuration, it is possible to separate and collect the substance to which iodine 131 is adhered and iodine vapor containing iodine 131 with higher efficiency.

[5] In the radioactive substance blocking mask of the present invention, the substance that adsorbs iodine is preferably silver fine particles.

  Even with such a configuration, it is possible to separate and collect the substance to which iodine 131 is adhered and iodine vapor containing iodine 131 with higher efficiency.

In the radioactive substance blocking mask of the present invention, the average particle diameter of the silver fine particles is preferably in the range of 10 nm to 10 μm.
If the average particle size of the silver fine particles is smaller than 10 nm, it may be difficult to produce the silver fine particles. If the average particle size is larger than 10 μm, the silver fine particles are too large for the nanofibers. This is because there are cases where the silver fine particles are detached more often. From the above viewpoint, the average particle diameter of the silver fine particles is more preferably in the range of 50 nm to 2 μm.

[6] In the radioactive substance blocking mask of the present invention, it is preferable that the nanofiber layer further includes a substance that adsorbs cesium.

  With such a configuration, a substance containing cesium 137 can be separated and collected with higher efficiency.

[7] In the radioactive substance blocking mask of the present invention, the substance that adsorbs cesium is preferably zeolite fine particles.

  With such a configuration, a substance containing cesium 137 can be separated and collected with higher efficiency.

In the radioactive substance blocking mask of the present invention, the average particle diameter of the zeolite fine particles is preferably in the range of 10 nm to 10 μm.
If the average particle size of the zeolite fine particles is smaller than 10 nm, it may be difficult to produce the zeolite fine particles. If the average particle size is larger than 10 μm, the zeolite fine particles are too large for the nanofibers. This is because the detachment of zeolite fine particles may increase. From the above viewpoint, the average particle diameter of the zeolite fine particles is more preferably in the range of 50 nm to 2 μm.

[8] In the radioactive substance blocking mask of the present invention, the nanofiber layer is preferably prepared by an electrospinning method.

  By setting it as such a structure, it becomes possible to comprise the nanofiber layer containing the nanofiber of uniform average fiber diameter, and to comprise the radioactive substance blocking mask with stable performance. In addition, it is possible to dissolve potassium iodide or boric acid or to disperse silver fine particles or zeolite fine particles in a polymer solution containing polyvinyl alcohol. Therefore, electrospinning is performed using a polymer solution containing these substances. Thus, these substances can be included in the nanofiber layer relatively easily.

[9] In the radioactive substance blocking mask of the present invention, the mask body is a laminate of the nanofiber layer and two microfiber layers laminated on both surfaces of the nanofiber layer as the microfiber layer. Preferably it consists of.

  By adopting such a configuration, it is possible to configure a so-called sandwich structure radioactive substance blocking mask in which a nanofiber layer is sandwiched between microfiber layers. For this reason, even when potassium iodide, boric acid, silver fine particles, zeolite fine particles, etc. are included in the nanofiber layer, it becomes possible to prevent these substances from directly entering the human body, and safe radioactive materials It becomes a blocking mask.

[10] In the radioactive substance blocking mask of the present invention, the mask main body includes a pair of laminates of the nanofiber layer and the microfiber layer laminated on one surface of the nanofiber layer. It is also preferable that the laminate is arranged so that the nanofiber layer is located inside.

  Also with such a configuration, it is possible to configure a so-called sandwich structure radioactive substance blocking mask in which a nanofiber layer is sandwiched between microfiber layers. For this reason, even when potassium iodide, boric acid, silver fine particles, zeolite fine particles, etc. are included in the nanofiber layer, it becomes possible to prevent these substances from directly entering the human body, and safe radioactive materials It becomes a blocking mask.

[11] In the radioactive substance blocking mask of the present invention, the mask body is composed of a laminate of the nanofiber layer and the microfiber layer laminated on one surface of the nanofiber layer, and is attached to a human body. Sometimes, it is also preferable that the laminate is configured such that the nanofiber layer faces outward.

  Even when the nanofiber layer contains potassium iodide, boric acid, silver fine particles, zeolite fine particles, etc., the above structure can prevent these substances from directly entering the human body. It becomes possible and it becomes a safe radioactive substance blocking mask.

[12] In the radioactive substance blocking mask of the present invention, the mask main body further includes a second nanofiber layer disposed so as to be positioned closer to the nostril side than the nanofiber layer when worn on a human body. Is preferred.

  With such a configuration, even when potassium iodide, boric acid, silver fine particles, zeolite fine particles and the like are included in the nanofiber layer, these substances are directly applied to the human body due to the presence of the second nanofiber layer. It is possible to more reliably prevent entry, and a more safe radioactive substance blocking mask can be obtained.

  It is preferable that a 2nd nanofiber layer contains the 2nd nanofiber which has an average fiber diameter in the range of 10 nm-3000 nm. This is because when the average fiber diameter of the second nanofiber is smaller than 10 nm, it may be difficult to produce the second nanofiber. When the average fiber diameter is larger than 3000 nm, from the viewpoint of surface area and pores. This is because it may be difficult to separate and collect potassium iodide, boric acid, silver fine particles, zeolite fine particles and the like. From the above viewpoint, the average fiber diameter of the nanofibers is more preferably in the range of 50 nm to 500 nm.

  The material constituting the second nanofiber is not only polyvinyl alcohol (PVA) but also, for example, polylactic acid (PLA), polypropylene (PP), polyvinyl acetate (PVAc), polyethylene terephthalate (PET), polybutylene. Terephthalate (PBT), polyethylene naphthalate (PEN), polyamide (PA), polyurethane (PUR), polyacrylonitrile (PAN), polyetherimide (PEI), polycaprolactone (PCL), polylactic acid glycolic acid (PLGA), silk Various polymers such as cellulose and chitosan can be used depending on the purpose.

The figure shown in order to demonstrate the radioactive substance shielding mask which concerns on Embodiment 1. FIG. The front view of the nanofiber layer manufacturing apparatus 100 in Embodiment 1. FIG. 3 is a flowchart showing a manufacturing process of the radioactive substance blocking mask in the first embodiment. The figure shown in order to demonstrate the radioactive substance shielding mask which concerns on Embodiment 2. FIG. The figure shown in order to demonstrate the radioactive substance shielding mask which concerns on Embodiment 3. FIG. The figure shown in order to demonstrate the radioactive substance shielding mask which concerns on Embodiment 4. FIG. The figure shown in order to demonstrate the radioactive substance shielding mask which concerns on Embodiment 5. FIG. The figure shown in order to demonstrate the radioactive substance shielding mask which concerns on Embodiment 6. FIG. The figure shown in order to demonstrate the radioactive substance shielding mask which concerns on Embodiment 7. FIG. The figure shown in order to demonstrate the radioactive substance shielding mask which concerns on Embodiment 8. FIG. The figure shown in order to demonstrate the radioactive substance shielding mask which concerns on Embodiment 9. FIG.

  Hereinafter, the radioactive substance blocking mask of the present invention will be described based on the embodiments shown in the drawings.

[Embodiment 1]
1. Configuration of Radioactive Material Blocking Mask First, the configuration of the radioactive material blocking mask according to the first embodiment will be described.
FIG. 1 is a view for explaining the radioactive substance blocking mask according to the first embodiment. FIG. 1A is a perspective view of a mask body 1 in a material stage in a radioactive substance blocking mask wound around a core material (not shown), and FIG. 1B is a portion of the mask body 1. FIG. 1C is an enlarged cross-sectional view, and FIG. 1C is a diagram further enlarging the range indicated by the symbol A in FIG.
Note that all the diagrams showing the configuration and the like are schematic diagrams and do not necessarily match the actual size, thickness, and the like.

  The radioactive substance blocking mask according to Embodiment 1 includes a mask body 1 that covers the nose and a mounting member (not shown) disposed on the mask body 1, and the mask body 1 has an average fiber diameter. And the microfiber layer 10 including the microfibers 12 in the range of 1 to 100 μm (for example, 10 nm), and the average fiber diameter laminated on the microfiber layer 10 is in the range of 10 to 3000 nm (for example, 200 nm). It has the nanofiber layer 20 containing the nanofiber 22 (refer Fig.1 (a)-FIG.1 (c)). And the mask main body 1 consists of a laminated body of the nanofiber layer 20 and the two microfiber layers 10 and 30 laminated | stacked on both surfaces of the nanofiber layer 20 as a microfiber layer.

  The layer thickness of the nanofiber layer 20 is in the range of 300 nm to 5000 nm (for example, 1000 nm). The layer thickness of the microfiber layers 10 and 30 can be set arbitrarily according to the purpose.

The average fiber diameter of the nanofibers 22 is in the range of 10 nm to 3000 nm (for example, 200 nm) as described above. As described above, the average fiber diameter of the microfibers 12 is in the range of 1 to 100 μm (for example, 10 μm).
The nanofiber 22 is made of polyvinyl alcohol (PVA).

  The nanofiber layer 20 is produced by an electrospinning method.

2. Nanofiber layer manufacturing apparatus 100
Next, the structure of the nanofiber layer manufacturing apparatus 100 in Embodiment 1 is demonstrated.
FIG. 2 is a front view of the nanofiber layer manufacturing apparatus 100 according to the first embodiment. In FIG. 2, some members are shown as sectional views.

The nanofiber layer manufacturing apparatus 100 is an apparatus for manufacturing the radioactive substance blocking mask according to the first embodiment. That is, in Embodiment 1, it can be said that it is a radioactive substance blocking mask manufacturing apparatus.
As shown in FIG. 2, the nanofiber layer manufacturing apparatus 100 includes a transport device 110 and one electrospinning device 120. In addition, it is good also as a nanofiber layer manufacturing apparatus provided with two or more electrospinning apparatuses.

The transport device 110 transports the microfiber layer 10 at a predetermined transport speed. The conveying device 110 includes a feeding roller 111 that feeds out the microfiber layer 10, a winding roller 112 that winds up the microfiber layer 10, tension rollers 113 and 118 that adjust the tension of the microfiber layer 10, and a feeding roller 111 and a winding roller. Auxiliary rollers 114 positioned between the auxiliary rollers 114 are provided. The feed roller 111 and the take-up roller 112 are configured to be rotated by a drive motor (not shown).
The electrospinning device 120 forms the nanofiber layer 20 including the nanofibers 22 on the microfiber layer 10 being transported by the transport device 110.

  As shown in FIG. 2, the electrospinning device 120 includes a housing 200, a nozzle unit 210, a polymer solution supply unit 230, a collector 250, a power supply device 260, and an auxiliary belt device 270. The electrospinning apparatus 120 discharges the polymer solution from the discharge ports of a plurality of upward nozzles 220, which will be described later, to form the nanofiber layer 20.

The housing 200 is made of a conductor and is grounded.
The nozzle unit 210 has a plurality of upward nozzles 220.
In the nanofiber layer manufacturing apparatus for manufacturing the radioactive substance blocking mask of the present invention, nozzle units having various sizes and shapes can be used. When viewed, it has a block-like shape with a side that looks like a rectangle (including a square) with a side of 0.5 m to 3 m.

  The upward nozzle 220 is a nozzle that discharges the polymer solution supplied from the polymer solution supply unit 230 upward from the discharge port. As the material constituting the upward nozzle 220, a conductor can be used, and for example, copper, stainless steel, aluminum, or the like can be used.

  The upward nozzles 220 are arranged at a pitch of 1.5 cm to 6.0 cm, for example. The number of upward nozzles 220 may be, for example, 36 (6 × 6 when arranged in the same vertical and horizontal directions) to 21904 (148 × 148 when arranged in the same vertical and horizontal directions).

  In the first embodiment, the upward nozzle 220 is used as the nozzle, but the present invention is not limited to this. A horizontal nozzle may be used as the nozzle, or a downward nozzle may be used.

The polymer solution supply unit 230 includes a raw material tank 232 and a polymer solution supply device 234.
The raw material tank 232 stores a polymer solution that is a raw material of the nanofiber layer 20. The raw material tank 232 includes a stirring device 233 for preventing separation and coagulation of the polymer solution. A pipe 236 of a polymer solution supply device 234 is connected to the raw material tank 232.

  The polymer solution supply device 234 includes a pipe 236 that allows the polymer solution to pass therethrough and a valve 238 that controls the supply operation, and supplies the polymer solution stored in the raw material tank 232 to the nozzle unit 210. Note that at least one polymer solution supply device may be provided for each nozzle unit, and a plurality of polymer solution supply devices may be provided.

The collector 250 is disposed above the nozzle unit 210. The collector 250 is made of a conductor and is attached to the housing 200 via an insulating member 252 as shown in FIG.
The power supply device 260 applies a high voltage between the upward nozzle 220 and the collector 250. The positive electrode of the power supply device 260 is connected to the collector 250, and the negative electrode of the power supply device 260 is connected to the nozzle unit 210 via the housing 200.

  The auxiliary belt device 270 includes an auxiliary belt 272 that rotates in synchronization with the conveying speed of the long microfiber layer 10 and five auxiliary belt rollers 274 that assist the rotation of the auxiliary belt 272. Of the five auxiliary belt rollers 274, one or more auxiliary belt rollers are drive rollers, and the remaining auxiliary belt rollers are driven rollers. Since the auxiliary belt 272 is disposed between the collector 250 and the microfiber layer 10, the microfiber layer 10 is smoothly conveyed without being attracted to the collector 250 to which a positive high voltage is applied. become.

3. Manufacturing Method of Radioactive Material Blocking Mask Next, a manufacturing method of the radioactive material blocking mask in Embodiment 1 will be described.
FIG. 3 is a flowchart of the manufacturing method of the radioactive substance blocking mask in the first embodiment.

  The manufacturing method of the radioactive substance blocking mask in Embodiment 1 includes a microfiber layer preparation step S1, a polymer solution preparation step S2, an electrospinning step S3, and a laminating step S4, as shown in FIG. The manufacturing method of the radioactive substance blocking mask in the first embodiment is a method of manufacturing the radioactive substance blocking mask according to the first embodiment using the nanofiber layer manufacturing apparatus 100 described above.

S1. Microfiber layer preparation process The microfiber layer preparation process S1 is a process of preparing the microfiber layer 10. In Embodiment 1, in order to manufacture the radioactive substance blocking mask according to Embodiment 1, a microfiber layer made of a nonwoven fabric having an average fiber diameter of 10 μm is prepared.

S2. Polymer Solution Preparation Step The polymer solution preparation step S2 is a step of preparing a polymer solution containing a polymer material. In Embodiment 1, polyvinyl alcohol (PVA) is used as the polymer material, and water is used as the solvent. The molecular weight, concentration, and temperature of the polymer material can be appropriately determined according to the type of radioactive substance blocking mask to be manufactured.

S3. Electrospinning process In the electrospinning process S3, the nanofiber layer 20 was formed on the microfiber layer 10 as the base material layer by the electrospinning method using the polymer solution, and the microfiber layer 10 and the nanofiber layer 20 were laminated. This is a process for producing a laminated body having a structure.

First, the produced polymer solution is supplied to the nozzle unit 210 through the polymer solution supply unit 230.
Next, the microfiber layer 10 which is a long sheet is set on the conveying device 110, and then the microfiber layer 10 is conveyed from the feeding roller 111 toward the take-up roller 112 at a predetermined conveying speed, and the electrospinning device. In 120, the nanofiber layer 20 is formed on the microfiber layer 10, and a laminate having a structure in which the microfiber layer 10 and the nanofiber layer 20 are stacked is manufactured. The laminate is wound around the winding roller 112.

S4. Lamination process The lamination process S4 is another microfiber so as to cover the nanofiber layer 20 on the surface on which the nanofiber layer 20 is formed in the laminate having a structure in which the microfiber layer 10 and the nanofiber layer 20 are laminated. This is a step of forming the layer 30.

  After that, the material manufactured as described above is cut into the shape of the mask main body to produce the mask main body 1, and the mounting member is attached to the mask main body 1, whereby the radioactive substance blocking mask according to the first embodiment. Can be manufactured.

  Below, the spinning conditions in Embodiment 1 are shown as an example.

  The polymer material is polyvinyl alcohol as described above, and the solvent is water. The solvent may be used by mixing water and another solvent such as alcohol. The polymer solution may contain an additive such as a conductivity improver.

  A conveyance speed can be set to 0.2 m / min-100 m / min, for example. The voltage applied to the collector 250 and the nozzle unit 210 can be set to 10 kV to 80 kV, and is preferably set to around 50 kV.

  The temperature of the spinning zone can be set at 25 ° C., for example. The humidity of the spinning area can be set to 30%, for example.

4). Effect of radioactive substance blocking mask According to the radioactive substance blocking mask according to the first embodiment, the mask body 1 includes a microfiber layer 10 including microfibers 12 having an average fiber diameter in the range of 1 to 100 μm, and an average fiber diameter. And the nanofiber layer 20 including the nanofibers 22 within the range of 10 nm to 3000 nm, it is possible to efficiently separate and collect dust or dust to which radioactive substances such as iodine 131 and cesium 137 are attached. Become.
Further, according to the radioactive substance blocking mask according to Embodiment 1, since the nanofibers 22 are made of polyvinyl alcohol (PVA) having an iodine collecting effect, it is possible to separate and collect iodine vapor containing iodine 131. It becomes.

  As a result, the radioactive substance blocking mask according to the first embodiment can separate and collect substances with radioactive substances such as iodine 131 and cesium 137 attached thereto and iodine iodine vapor containing iodine 131. It becomes a radioactive substance blocking mask capable of greatly reducing the amount of radioactive substance (especially iodine 131) entering.

  Further, according to the radioactive substance blocking mask according to Embodiment 1, since the nanofiber layer 20 is produced by the electrospinning method, the nanofiber layer 20 including nanofibers 22 having a uniform average fiber diameter is provided, It is possible to construct a radioactive substance blocking mask with stable performance.

  Furthermore, according to the radioactive substance blocking mask according to Embodiment 1, the mask body 1 is a laminate of the nanofiber layer 20 and the two microfiber layers 10 and 30 laminated on both surfaces of the nanofiber layer 20. Therefore, a so-called sandwich structure radioactive substance blocking mask in which the nanofiber layer is sandwiched between the microfiber layers can be configured. For this reason, even when potassium iodide, boric acid, silver fine particles, zeolite fine particles, etc. are included in the nanofiber layer, it becomes possible to prevent these substances from directly entering the human body, and safe radioactive materials It becomes a blocking mask.

[Embodiment 2]
FIG. 4 is a view for explaining the radioactive substance blocking mask according to the second embodiment. FIG. 4A is a perspective view of the mask body 1a in the material stage of the radioactive substance blocking mask wound around a core material (not shown), and FIG. 4B is a portion of the mask body 1a. FIG. 4C is an enlarged cross-sectional view, and FIG. 4C is a diagram further enlarging the range indicated by the symbol A in FIG.

  The radioactive substance blocking mask according to the second embodiment basically has the same configuration as the radioactive substance blocking mask according to the first embodiment, but the configuration of the nanofiber layer is different from that of the radioactive substance blocking mask according to the first embodiment. . That is, in the radioactive substance blocking mask according to Embodiment 2, the nanofiber layer 20a further includes potassium iodide as a substance that adsorbs iodine in addition to the nanofibers 22a, as shown in FIG.

  As described above, the radioactive substance blocking mask according to the second embodiment is different from the radioactive substance blocking mask according to the first embodiment in the configuration of the nanofiber layer 20a, but the mask body 1a has an average fiber diameter in the range of 1 to 100 μm. In addition to the microfiber layer 10 including the microfibers 12 inside and the nanofiber layer 20a including the nanofibers 22a having an average fiber diameter in the range of 10 nm to 3000 nm, the nanofibers 22a have an iodine collecting effect. Since it is made of polyvinyl alcohol (PVA), the substance to which radioactive substances such as iodine 131 and cesium 137 are attached and iodine iodine vapor containing iodine 131 are separated and separated as in the case of the radioactive substance blocking mask according to the first embodiment. Release that can be collected and can greatly reduce the amount of radioactive material (especially iodine 131) that enters the human body. The sex material blocking mask.

  Further, in the radioactive substance blocking mask according to the second embodiment, the nanofiber layer 20a further includes potassium iodide as a substance that adsorbs iodine in addition to the nanofibers 22a. It becomes possible to separate and collect iodine vapor containing 131 with higher efficiency.

  The radioactive substance blocking mask according to the second embodiment is the same as the radioactive substance blocking mask according to the first embodiment, except that the polymer solution is prepared by dissolving polyvinyl alcohol and potassium iodide in water as a solvent in the polymer solution manufacturing step S2. It can manufacture by implementing the process similar to this manufacturing method.

[Embodiment 3]
FIG. 5 is a view for explaining the radioactive substance blocking mask according to the third embodiment. FIG. 5A is a perspective view of the mask body 1b at the material stage in the radioactive substance blocking mask wound around a core material (not shown), and FIG. 5B is a portion of the mask body 1b. FIG. 5C is an enlarged cross-sectional view, and FIG. 5C is a view further enlarging the range indicated by the symbol A in FIG. 5B.

The radioactive substance blocking mask according to the third embodiment basically has the same configuration as the radioactive substance blocking mask according to the second embodiment, but the configuration of the nanofiber layer is different from that of the radioactive substance blocking mask according to the second embodiment. . That is, in the radioactive substance blocking mask according to Embodiment 3, as shown in FIG. 5, the nanofiber layer 20b further contains boric acid (H ₃ BO ₃ ) as a substance that adsorbs iodine in addition to the nanofibers 22b. Including.

  Thus, the radioactive substance blocking mask according to the third embodiment is different from the radioactive substance blocking mask according to the second embodiment in the configuration of the nanofiber layer 20b, but the mask body 1b has an average fiber diameter in the range of 1 to 100 μm. In addition to the microfiber layer 10 including the microfibers 12 inside and the nanofiber layer 20b including the nanofibers 22b having an average fiber diameter in the range of 10 nm to 3000 nm, the nanofibers 22b have an iodine collecting effect. Since it is made of polyvinyl alcohol (PVA), the substance to which radioactive substances such as iodine 131 and cesium 137 are attached and iodine iodine vapor containing iodine 131 are separated and separated as in the case of the radioactive substance blocking mask according to the second embodiment. Release that can be collected and can greatly reduce the amount of radioactive material (especially iodine 131) that enters the human body. The sex material blocking mask.

  Further, in the radioactive substance blocking mask according to Embodiment 3, since the nanofiber layer 20b further includes potassium iodide as a substance that adsorbs iodine in addition to the nanofibers 22b, It becomes possible to separate and collect iodine vapor containing 131 with higher efficiency.

The radioactive substance blocking mask according to Embodiment 3 is the same as that in Embodiment 2 except that, in the polymer solution preparation step S2, polyvinyl alcohol and boric acid (H ₃ BO ₃ ) are dissolved in water as a solvent to prepare a polymer solution. It can manufacture by implementing the process similar to the manufacturing method of a radioactive substance shielding mask.

[Embodiment 4]
FIG. 6 is a view for explaining the radioactive substance blocking mask according to the fourth embodiment. 6A is a perspective view of the mask body 1c in the material stage of the radioactive substance blocking mask wound around a core material (not shown), and FIG. 6B is a portion of the mask body 1c. FIG. 6C is an enlarged cross-sectional view, and FIG. 6C is a diagram further enlarging the range indicated by the symbol A in FIG. 6B.

  The radioactive substance blocking mask according to the fourth embodiment has basically the same configuration as the radioactive substance blocking mask according to the first embodiment, but the configuration of the nanofiber layer is different from that of the radioactive substance blocking mask according to the first embodiment. . That is, in the radioactive substance blocking mask according to Embodiment 4, the nanofiber layer 20c further includes silver fine particles 24c as a substance that adsorbs iodine in addition to the nanofibers 22c, as shown in FIG. The average particle diameter of the silver fine particles 24c is in the range of 10 nm to 10 μm (for example, 100 nm).

  Thus, the radioactive substance blocking mask according to the fourth embodiment is different from the radioactive substance blocking mask according to the first embodiment in the configuration of the nanofiber layer 20c, but the mask body 1c has an average fiber diameter in the range of 1 to 100 μm. The microfiber layer 10 including the microfibers 12 inside and the nanofiber layer 20c including the nanofibers 22c having an average fiber diameter in the range of 10 nm to 3000 nm, and the nanofibers 22c have an iodine collecting effect. Since it is made of polyvinyl alcohol (PVA), the substance to which radioactive substances such as iodine 131 and cesium 137 are attached and iodine iodine vapor containing iodine 131 are separated and separated as in the case of the radioactive substance blocking mask according to the first embodiment. Release that can be collected and can greatly reduce the amount of radioactive material (especially iodine 131) that enters the human body. The sex material blocking mask.

  Further, in the radioactive substance blocking mask according to the fourth embodiment, the nanofiber layer 20c further includes silver fine particles 24c as a substance that adsorbs iodine in addition to the nanofibers 22c. It becomes possible to separate and collect iodine vapor containing 131 with higher efficiency.

  The radioactive substance blocking mask according to Embodiment 4 is the same as that in Embodiment 1 except that, in the polymer solution preparation step S2, polyvinyl alcohol is dissolved in water as a solvent and silver fine particles 24c are dispersed to prepare a polymer solution. It can manufacture by implementing the process similar to the manufacturing method of a substance blocking mask.

[Embodiment 5]
FIG. 7 is a view for explaining the radioactive substance blocking mask according to the fifth embodiment. FIG. 7A is a perspective view of the mask body 1d in the material stage of the radioactive substance blocking mask wound around a core (not shown), and FIG. 7B is a portion of the mask body 1d. FIG. 7C is an enlarged cross-sectional view, and FIG. 7C is a diagram further enlarging the range indicated by the symbol A in FIG.

  The radioactive substance blocking mask according to the fifth embodiment basically has the same configuration as the radioactive substance blocking mask according to the first embodiment, but the configuration of the nanofiber layer is different from that of the radioactive substance blocking mask according to the first embodiment. . That is, in the radioactive substance blocking mask according to the fifth embodiment, as shown in FIG. 7, the nanofiber layer 20d further includes zeolite fine particles 24d as a substance that adsorbs cesium in addition to the nanofibers 22d. The average particle diameter of the zeolite fine particles 24d is in the range of 10 nm to 10 μm (for example, 100 nm).

  As described above, the radioactive substance blocking mask according to the fifth embodiment is different from the radioactive substance blocking mask according to the first embodiment in the configuration of the nanofiber layer 20d, but the mask main body 1d has an average fiber diameter in the range of 1 to 100 μm. The microfiber layer 10 including the microfibers 12 inside and the nanofiber layer 20d including the nanofibers 22d having an average fiber diameter in the range of 10 nm to 3000 nm, and the nanofibers 22d have an iodine collecting effect. Since it is made of polyvinyl alcohol (PVA), the substance to which radioactive substances such as iodine 131 and cesium 137 are attached and iodine iodine vapor containing iodine 131 are separated and separated as in the case of the radioactive substance blocking mask according to the first embodiment. Release that can be collected and can greatly reduce the amount of radioactive material (especially iodine 131) that enters the human body. The sex material blocking mask.

  Further, in the radioactive substance blocking mask according to the fifth embodiment, the nanofiber layer 20d further includes zeolite fine particles 24d as a substance that adsorbs cesium in addition to the nanofibers 22d, so that a substance containing cesium 137 can be obtained with high efficiency. Separation and collection are possible.

  The radioactive substance blocking mask according to Embodiment 5 is the same as that in Embodiment 1 except that, in the polymer solution preparation step S2, polyvinyl alcohol is dissolved in water as a solvent and the zeolite fine particles 24d are dispersed to prepare a polymer solution. It can manufacture by implementing the process similar to the manufacturing method of a substance blocking mask.

[Embodiment 6]
FIG. 8 is a view for explaining the radioactive substance blocking mask according to the sixth embodiment. FIG. 8A is a perspective view of the mask body 1e in the material stage of the radioactive substance blocking mask wound around a core (not shown), and FIG. 8B is a portion of the mask body 1e. FIG. 8C is an enlarged cross-sectional view, and FIG. 8C is a diagram further enlarging the range indicated by the symbol A in FIG. 8B.

  The radioactive substance blocking mask according to the sixth embodiment basically has the same configuration as the radioactive substance blocking mask according to the first embodiment, but the configuration of the nanofiber layer is different from that of the radioactive substance blocking mask according to the first embodiment. . That is, in the radioactive substance blocking mask according to Embodiment 6, as shown in FIG. 8, in addition to the nanofibers 22e, the nanofiber layer 20e is a substance that adsorbs silver fine particles 24e as a substance that adsorbs iodine and cesium. Further, zeolite fine particles 26e are included. The average particle size of the silver fine particles 24e is in the range of 10 nm to 10 μm (for example, 100 nm), and the average particle size of the zeolite fine particles 26e is in the range of 10 nm to 10 μm (for example, 100 nm).

  Thus, the radioactive substance blocking mask according to the sixth embodiment is different from the radioactive substance blocking mask according to the first embodiment in the configuration of the nanofiber layer 20e, but the mask body 1e has an average fiber diameter in the range of 1 to 100 μm. The microfiber layer 10 including the microfibers 12 inside and the nanofiber layer 20e including the nanofibers 22e having an average fiber diameter in the range of 10 nm to 3000 nm, and the nanofibers 22e have an iodine collecting effect. Since it is made of polyvinyl alcohol (PVA), the substance to which radioactive substances such as iodine 131 and cesium 137 are attached and iodine iodine vapor containing iodine 131 are separated and separated as in the case of the radioactive substance blocking mask according to the first embodiment. Release that can be collected and can greatly reduce the amount of radioactive material (especially iodine 131) that enters the human body. The sex material blocking mask.

  In the radioactive substance blocking mask according to the sixth embodiment, the nanofiber layer 20e further includes silver fine particles 24e as a substance that adsorbs iodine and zeolite fine particles 26e as a substance that adsorbs cesium in addition to the nanofibers 22e. Therefore, it is possible to separate and collect substances with iodine 131 and iodine vapor containing iodine 131 with higher efficiency, and with high efficiency it is possible to separate and collect substances containing cesium 137. It becomes.

  The radioactive substance blocking mask according to Embodiment 6 is implemented in the polymer solution preparation step S2 except that the polymer solution is prepared by dissolving the polyvinyl alcohol in water as a solvent and dispersing the silver particles 24e and the zeolite fine particles 26e. It can manufacture by implementing the process similar to the manufacturing method of the radioactive substance blocking mask in the form 1.

[Embodiment 7]
FIG. 9 is a view for explaining the radioactive substance blocking mask according to the seventh embodiment. FIG. 9A is a perspective view of the mask body 1f in the material stage of the radioactive substance blocking mask wound around a core material (not shown), and FIG. 9B is a portion of the mask body 1f. FIG. 9C is an enlarged cross-sectional view, and FIG. 9C is a diagram further enlarging the range indicated by the symbol A in FIG.

  The radioactive substance blocking mask according to the seventh embodiment basically has the same configuration as the radioactive substance blocking mask according to the sixth embodiment, except that the laminated structure of the mask body is the radioactive substance blocking mask according to the sixth embodiment. Is different. That is, in the radioactive substance blocking mask according to the seventh embodiment, as shown in FIG. 9, the mask body 1f includes a nanofiber layer 20f and a microfiber layer 10 laminated on one surface of the nanofiber layer 20f. A pair of laminates are provided, and the pair of laminates are arranged so that the nanofiber layer 20f is located inside.

  Thus, the radioactive substance blocking mask according to the seventh embodiment is different from the radioactive substance blocking mask according to the sixth embodiment in the laminated structure of the mask body, but the mask body 1f has an average fiber diameter of 1 to 100 μm. The microfiber layer 10 including the microfibers 12 within the range and the nanofiber layer 20f including the nanofibers 22f having the average fiber diameter in the range of 10 nm to 3000 nm are provided, and the nanofibers 22f have an iodine collection effect. Since it is made of a certain polyvinyl alcohol (PVA), a substance to which radioactive substances such as iodine 131 and cesium 137 are attached and iodine iodine vapor containing iodine 131 are separated in the same manner as the radioactive substance blocking mask according to the sixth embodiment. -Capable of collecting and greatly reducing the amount of radioactive material (particularly iodine 131) entering the human body The radioactive material blocking mask.

  In the radioactive substance blocking mask according to Embodiment 7, the mask body 1f includes a pair of laminates of the nanofiber layer 20f and the microfiber layer 10 laminated on one surface of the nanofiber layer 20f. Since the laminated body is arranged so that the nanofiber layer 20f is located on the inner side, a so-called sandwich structure radioactive substance blocking mask in which the nanofiber layer is sandwiched between the microfiber layers can be configured. For this reason, as in the case of the radioactive substance blocking mask according to the sixth embodiment, even when the nanofiber layer contains potassium iodide, boric acid, silver fine particles, zeolite fine particles, etc., these substances are directly applied to the human body. It becomes possible to prevent entering, and it becomes a safe radioactive substance blocking mask.

  The radioactive substance blocking mask according to the seventh embodiment prepares a pair of stacked bodies of the nanofiber layer 20f and the microfiber layer 10 stacked on one surface of the nanofiber layer 20f in the stacking step S4. The laminated body is manufactured by carrying out the same process as the manufacturing method of the radioactive substance blocking mask in the embodiment 6 except that the pair of laminated bodies are laminated so that the nanofiber layer 20f is located inside. be able to.

[Embodiment 8]
FIG. 10 is a view for explaining the radioactive substance blocking mask according to the eighth embodiment. FIG. 10A is a perspective view of the mask body 1g in the material stage of the radioactive substance blocking mask wound around a core (not shown), and FIG. 10B is a portion of the mask body 1g. FIG. 10C is an enlarged cross-sectional view, and FIG. 10C is a diagram further enlarging the range indicated by the symbol A in FIG.

  The radioactive substance blocking mask according to the eighth embodiment has basically the same configuration as the radioactive substance blocking mask according to the sixth embodiment, but the laminated structure of the mask body is the radioactive substance blocking mask according to the sixth embodiment. Is different. That is, in the radioactive substance blocking mask according to Embodiment 8, as shown in FIG. 10, a mask body 1g is composed of a nanofiber layer 20g and a microfiber layer 10 laminated on one surface of the nanofiber layer 20g. It consists of a laminated body, and when the human body is worn, the laminated body is configured such that the nanofiber layer 20g faces outward.

  As described above, the radioactive substance blocking mask according to the eighth embodiment is different from the radioactive substance blocking mask according to the sixth embodiment in the laminated structure of the mask body, but the mask body 1g has an average fiber diameter of 1 to 100 μm. The microfiber layer 10 including the microfibers 12 within the range and the nanofiber layer 20g including the nanofibers 22g having the average fiber diameter within the range of 10 nm to 3000 nm, and the nanofibers 22g have an iodine collecting effect. Since it is made of a certain polyvinyl alcohol (PVA), a substance to which radioactive substances such as iodine 131 and cesium 137 are attached and iodine iodine vapor containing iodine 131 are separated in the same manner as the radioactive substance blocking mask according to the sixth embodiment. -Capable of collecting and greatly reducing the amount of radioactive material (particularly iodine 131) entering the human body The radioactive material blocking mask.

  In addition, the radioactive substance blocking mask according to Embodiment 8 includes a mask body 1g including a laminate of a nanofiber layer 20g and a microfiber layer 10 laminated on one surface of the nanofiber layer 20g, and is attached to a human body. In this case, since the laminate is configured so that the nanofiber layer 20g faces outward, even if the nanofiber layer contains potassium iodide, boric acid, silver fine particles, zeolite fine particles, etc., these It becomes possible to prevent the substance from directly entering the human body, and it becomes a safe radioactive substance blocking mask.

  The radioactive substance blocking mask according to Embodiment 8 can be manufactured by performing the same process as the manufacturing method of the radioactive substance blocking mask in Embodiment 6 except that the stacking step S4 is not performed.

[Embodiment 9]
FIG. 11 is a view for explaining the radioactive substance blocking mask according to the ninth embodiment. 11A is a perspective view of the mask body 1h in the material stage of the radioactive substance blocking mask wound around a core (not shown), and FIG. 11B is a portion of the mask body 1h. FIG. 11C is an enlarged cross-sectional view, and FIG. 11C is a diagram further enlarging the range indicated by the symbol A in FIG.

  The radioactive substance blocking mask according to the ninth embodiment basically has the same configuration as the radioactive substance blocking mask according to the sixth embodiment, except that the laminated structure of the mask body is the radioactive substance blocking mask according to the sixth embodiment. Is different. That is, the radioactive substance blocking mask according to Embodiment 9 further includes a second nanofiber layer 40 in the mask body 1h, as shown in FIG.

As shown in FIG. 11B, the second nanofiber layer 40 is located on the nose mouth side of the microfiber layer 30 so as to be located on the nose mouth side (inner side) of the nanofiber layer 20h when worn on the human body. (Inside). The second nanofiber layer is made of the second nanofiber.
The second nanofiber has an average fiber diameter in the range of 10 nm to 3000 nm (for example, 200 nm), and is made of, for example, polyvinyl alcohol (PVA). The second nanofiber may be made of a polymer other than polyvinyl alcohol (PVA).

  As described above, the radioactive substance blocking mask according to the ninth embodiment is different from the radioactive substance blocking mask according to the sixth embodiment in the laminated structure of the mask body, but the mask body 1h has an average fiber diameter of 1 to 100 μm. The microfiber layer 10 including the microfibers 12 within the range and the nanofiber layer 20h including the nanofibers 22h having an average fiber diameter in the range of 10 nm to 3000 nm, and the nanofibers 22h have an iodine collecting effect. Since it is made of a certain polyvinyl alcohol (PVA), a substance to which radioactive substances such as iodine 131 and cesium 137 are attached and iodine iodine vapor containing iodine 131 are separated in the same manner as the radioactive substance blocking mask according to the sixth embodiment. -Capable of collecting and greatly reducing the amount of radioactive material (particularly iodine 131) entering the human body The radioactive material blocking mask.

  In addition, the radioactive substance blocking mask according to Embodiment 9 further includes a second nanofiber layer 40 that is disposed so that the mask body 1h is positioned closer to the nostril side than the nanofiber layer 20h when the mask body 1h is attached to a human body. Accordingly, even when potassium iodide, boric acid, silver fine particles, zeolite fine particles, etc. are included in the nanofiber layer, the presence of the second nanofiber layer 40 ensures that these substances directly enter the human body. It becomes possible to prevent, and it becomes a safer radioactive substance blocking mask.

  The radioactive substance blocking mask according to the ninth embodiment is the same as the manufacturing method of the radioactive substance blocking mask in the sixth embodiment, except that the second nanofiber layer 40 is further formed after the microfiber layer 30 is formed in the stacking step. It can manufacture by implementing the process of. The formation of the second nanofiber layer 40 can be performed by, for example, an electrospinning method.

  As mentioned above, although this invention was demonstrated based on said embodiment, this invention is not limited to said embodiment. The present invention can be implemented in various forms without departing from the spirit thereof, and for example, the following modifications are possible.

(1) The number, positional relationship, and size of each component in each of the above embodiments are examples, and the present invention is not limited to this.

(2) In the radioactive substance blocking mask of the present invention, the microfiber layer may contain a substance that adsorbs iodine. Further, a substance that adsorbs cesium may be included in the microfiber layer.

(3) In the ninth embodiment, the present invention has been described by taking the mask body 1h in which the second nanofiber layer 40 is disposed on the nostril side (inside) of the microfiber layer 30 as an example. It is not limited to. As long as the second nanofiber layer is located on the nostril side of the nanofiber layer, the mask body in which the second nanofiber layer is disposed at any position may be used.

(4) In Embodiment 1, the radioactive substance blocking mask was manufactured using the nanofiber manufacturing apparatus 100 described above, but the present invention is not limited to this. The radioactive substance blocking mask can also be manufactured using a manufacturing apparatus other than the nanofiber manufacturing apparatus.

1, 1a, 1b, 1c, 1d, 1e, 1f, 1g, 1h ... mask body, 10, 30 ... microfiber layer, 12 ... microfiber, 20, 20a, 20b, 20c, 20d, 20e, 20f, 20g, 20h ... nanofiber layer, 22, 22a, 22b, 22c, 22d, 22e, 22f, 22g, 22h ... nanofiber, 24c, 24e, 24f, 24g, 24h ... silver fine particles, 24d, 26e, 26f, 26g, 26h ... Zeolite fine particles, 100 ... nanofiber layer production apparatus, 110 ... conveying apparatus, 111 ... feeding roller, 112 ... winding roller, 113, 118 ... tension roller, 114 ... auxiliary roller, 120 ... electrospinning apparatus, 200 ... casing, 210 ... Nozzle unit, 220 ... Upward nozzle, 230 ... Polymer solution supply unit, 232 ... Raw material tank 233 ... Stirring device, 234 ... Polymer solution supply device, 236 ... Pipe, 238 ... Valve, 250 ... Collector, 252 ... Insulating member, 260 ... Power supply device, 270 ... Auxiliary belt device, 272 ... Auxiliary belt, 274 ... For auxiliary belt roller

Claims (12)

A mask body covering the nostril, and a mounting member disposed on the mask body,
The mask body includes a microfiber layer including microfibers having an average fiber diameter in the range of 1 to 100 μm, and nanofibers laminated in the microfiber layer and having an average fiber diameter in the range of 10 nm to 3000 nm. And including a nanofiber layer,
The radioactive substance blocking mask, wherein the nanofiber is made of polyvinyl alcohol. The radioactive substance mask according to claim 1.
The radioactive substance blocking mask, wherein the nanofiber layer further includes a substance that adsorbs iodine. The radioactive substance mask according to claim 2,
The radioactive substance blocking mask, wherein the substance that adsorbs iodine is potassium iodide. The radioactive substance blocking mask according to claim 3,
The radioactive substance blocking mask, wherein the substance that adsorbs iodine is boric acid (boron dioxide). The radioactive substance blocking mask according to claim 3,
The radioactive substance blocking mask, wherein the substance that adsorbs iodine is silver fine particles. The radioactive substance blocking mask according to any one of claims 1 to 5,
The radioactive substance blocking mask, wherein the nanofiber layer further includes a substance that adsorbs cesium. The radioactive substance mask according to claim 6.
The radioactive substance blocking mask, wherein the substance that adsorbs cesium is zeolite fine particles. The radioactive substance blocking mask according to any one of claims 1 to 7,
2. The radioactive substance blocking mask according to claim 1, wherein the nanofiber layer is produced by an electrospinning method. The radioactive substance blocking mask according to any one of claims 1 to 8,
The mask main body is composed of a laminate of the nanofiber layer and two microfiber layers laminated on both surfaces of the nanofiber layer as the microfiber layer. The radioactive substance blocking mask according to any one of claims 1 to 8,
The mask main body includes a pair of laminates of the nanofiber layer and the microfiber layer laminated on one surface of the nanofiber layer, and the pair of laminates is positioned such that the nanofiber layer is located inside. A radioactive substance blocking mask characterized by being arranged in The radioactive substance blocking mask according to any one of claims 1 to 8,
The mask body is composed of a laminate of the nanofiber layer and the microfiber layer laminated on one surface of the nanofiber layer, and the laminate has the nanofiber layer facing outward when worn on a human body. A radioactive substance blocking mask characterized by being configured as described above. The radioactive substance blocking mask according to any one of claims 1 to 11,
The radioactive substance blocking mask, wherein the mask body further includes a second nanofiber layer disposed so as to be positioned closer to the nostril side than the nanofiber layer when worn on a human body.

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