Mask

Abstract

Provided is a mask capable of improving both droplet resistance and air permeability. A mask (1) is provided with: a longitudinal direction (Y) corresponding to the vertical direction of a wearer; a transverse direction (X) corresponding to the left-right direction of the wearer; and an air-permeable mask main body (10) that covers at least the mouth of the wearer. The mask main body has a plurality of sheet layers (20) and joining parts (30) that join the sheet layers to each other. The joining section has an outer edge joining section (31) provided to the outer edge section of the mask main body section. An air passage (50) is provided between the sheet layers, and the air passage (50) extends at least in the planar direction of the sheet layers and serves as an air passage.

Description

Technical Field

[0001] The present invention relates to a mask. Background Art

[0002] Patent Documents 1 and 2 disclose a mask comprising a breathable mask body that covers at least the wearer's nose and mouth, and strip-shaped ear loops joined to either side of the mask body. The mask body is constructed by stacking multiple sheet layers. This mask allows the multiple sheet layers to cover the wearer's mouth and nose, improving droplet protection.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Utility Model Registration No. 3108216

[0006] Patent Document 2: Japanese Utility Model Registration No. 3239655 Summary of the Invention

[0007] In the masks disclosed in Patent Documents 1 and 2, the layers are joined near their outer edges. This allows the layers to be integrated, utilizing the filtering effects of the multiple layers to improve droplet protection. However, since air must pass through multiple layers, improving breathability can sometimes be difficult.

[0008] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a mask capable of improving both droplet prevention and breathability.

[0009] A mask according to one embodiment includes a longitudinal direction corresponding to the wearer's vertical direction, a transverse direction corresponding to the wearer's horizontal direction, and a breathable mask body that covers at least the wearer's mouth. The mask body includes multiple layers and a joint that joins the layers together. The joint includes an outer edge joint provided at the outer edge of the mask body. An air passage is provided between the layers, extending at least along the plane of the layers and serving as a passage for air. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a side view of the mask according to the first embodiment in a folded state.

[0011] Figure 2 This is a perspective view of the mask according to the first embodiment in the unfolded state.

[0012] Figure 3 It is along Figure 2 A schematic cross-sectional view along line AA is shown.

[0013] Figure 4 This is a perspective view of the mask according to the second embodiment in the unfolded state.

[0014] Figure 5 This is a side view of the mask according to the third embodiment in a folded state.

[0015] Figure 6 This is a perspective view of a mask according to a third embodiment in an unfolded state. DETAILED DESCRIPTION

[0016] (1) Overview of Implementation

[0017] At least the following matters will become clear from the description of this specification and the accompanying drawings.

[0018] The invention of claim 1 is a mask comprising: a longitudinal direction corresponding to the wearer's vertical direction; a transverse direction corresponding to the wearer's horizontal direction; and a breathable mask body that covers at least the wearer's mouth. The mask body comprises multiple layers and a joint that joins the layers. The joint includes an outer edge joint provided at the outer edge of the mask body. An air path is provided between the layers, extending at least in the planar direction of the layers and serving as a passage for air. The mask body comprises multiple layers, thereby enhancing droplet protection. Furthermore, joining the layers together at the outer edge joint enables the integrated filtering effect of the layers to be utilized, improving dust and blood barrier properties. An air path extending in the planar direction is provided between the layers that constitute the mask body, serving as a passage for air. A ventilation opening of the air path is provided at the outer edge of the mask body. The air opening is formed at the outer edge of the mask body, located near the outer edge of the mask body. Therefore, the air in the ventilation path is easy to flow in and out through the ventilation opening, which can improve the breathability of the mask body. Therefore, according to the mask of this embodiment, both the anti-droplet performance and the breathability can be improved.

[0019] According to a preferred embodiment, based on the invention of claim 1, the invention of claim 2 may have the following features: The length of the ventilation opening along the outer edge of the mask body may be 5 mm or greater. A ventilation opening of 5 mm or greater facilitates air flow in and out of the ventilation path through the ventilation opening, thereby appropriately improving the breathability of the mask body.

[0020] According to a preferred embodiment, based on the invention of claim 1 or 2, the invention of claim 3 may have the following features: The ventilation opening is located below the longitudinal center of the mask. According to this embodiment, the ventilation opening located below the longitudinal center of the mask can be used to guide exhaled air toward the bottom of the mask. By guiding exhaled air downward, the amount of exhaled air directed toward the top of the mask can be reduced, thereby preventing fogging of glasses and drying of the eyes.

[0021] According to a preferred embodiment, based on any of the inventions in embodiments 1 to 3, the invention of embodiment 4 may have the following features. The ventilation openings at both ends of the ventilation path are arranged across the longitudinal center of the mask. According to this embodiment, the ventilation openings are formed on both sides, above and below the longitudinal center of the mask, forming a shape that extends in the vertical direction (longitudinal direction). Airflow occurs in the vertical direction when worn, ensuring breathability of the mask body.

[0022] According to a preferred embodiment, in addition to any one of the inventions of claims 1 to 3, the invention of claim 5 may have the following features. The ventilation openings at both ends of the ventilation path are arranged across the center of the mask in the transverse direction. According to this embodiment, the ventilation openings are formed on both the left and right sides of the transverse center of the mask, forming a shape that extends in the transverse direction. Air flow in the transverse direction during wear ensures breathability of the mask body.

[0023] According to a preferred embodiment, based on the invention of any one of embodiments 1 to 5, the invention of embodiment 6 may have the following features. The joint has a central joint that joins the sheet layers to each other in the center of the transverse direction of the mask body. The ventilation openings are respectively arranged on both sides of the central joint in the transverse direction. According to this embodiment, since ventilation openings are respectively arranged on both sides of the central joint, the air permeability can be improved on the left and right sides of the mask body. By uniformly improving the air permeability on the left and right sides of the mask body, air passes through a larger area of ​​the mask body as a whole, thereby improving the air permeability of the mask body.

[0024] According to a preferred embodiment, based on the invention of embodiment 6, the invention of embodiment 7 may have the following features. The mask has a pair of ear hooks respectively connected to the two side parts of the mask main body in the transverse direction. The mask main body and the ear hooks are joined by means of an ear hook joint extending along the longitudinal direction. A pair of air openings are arranged across the center of the mask in the longitudinal direction. The pair of air openings are arranged between the ear hook joint and the central joint. According to this embodiment, since the air path and the ear hook joint both extend in the longitudinal direction, the air colliding with the ear hook joint or the central joint can be guided to the outside of the longitudinal direction Y and allowed to enter and exit through the air openings.

[0025] According to a preferred embodiment, based on any one of the inventions of claims 1 to 7, the invention of claim 8 may have the following features: The distance between the central joint and the ear loop joints in the transverse direction varies. According to this embodiment, since the distance between the central joint and the ear loop joints varies, air passing through the longitudinally extending ventilation path is more likely to collide with the central joint or the ear loop joints, generating convection. This allows all air within the ventilation path to enter and exit the mask body.

[0026] According to a preferred embodiment, based on the invention of any one of embodiments 1 to 8, the invention of embodiment 9 may have the following features. The joint has a central joint that joins the sheet layers to each other at the center of the transverse direction of the mask main body. The end of the central joint in the longitudinal direction has a curved portion that bends inwards more than the center of the longitudinal direction of the central joint. By having a curved portion at the central joint, the mask main body can be easily bent in a manner that covers the corners of the mouth when worn. By bending the mask main body, the sheet layers can be easily separated from each other, and an air passage can be easily formed, which can improve the air permeability of the mask main body.

[0027] According to a preferred embodiment, in addition to any one of the inventions of claims 1 to 9, the invention of claim 10 may have the following features: The sheets are not joined to each other in regions other than the joining portions. The unjoined portions between the sheets can function as ventilation paths. According to this embodiment, a wider ventilation path can be ensured, thereby improving the breathability of the mask body.

[0028] According to a preferred embodiment, based on the invention of any one of embodiments 1 to 10, the invention of embodiment 11 may have the following features. The plurality of sheets include a first sheet and a second sheet located more outward than the first sheet. The mask body includes a nose fitting component for fitting the mask body to the nose of the wearer. The nose fitting component is joined to the first sheet of the first and second sheets. According to this embodiment, the first sheet is brought into close contact with the help of the nose fitting component, thereby facilitating the formation of a distance between the first and second sheets. By forming a distance between the sheet layers, it is easy to generate air flow between the sheet layers, thereby improving the air permeability of the mask body.

[0029] According to a preferred embodiment, based on any one of the inventions of claims 1 to 11, the invention of claim 12 may have the following features: A ventilation path is provided between the first and second layers. According to this embodiment, by closely contacting the first layer with the nose fitting member, a distance between the first and second layers is easily formed. This facilitates the formation of a ventilation path between the first and second layers, thereby improving the air permeability of the mask body.

[0030] According to a preferred embodiment, based on the invention of any one of embodiments 1 to 12, the invention of embodiment 13 may have the following features. At least one of the sheet layers is an SMS nonwoven fabric that has been subjected to an electrified process. According to this embodiment, since the sheet layer is subjected to an electrified process, the dust collection efficiency can be improved and the dustproofness can be improved. In addition, the SMS nonwoven fabric has a spunbond layer and a meltblown layer arranged between the spunbond layers. The fiber density of the meltblown layer is relatively fine, which can further improve the blood barrier properties of the medical mask. However, the breaking strength of the meltblown layer is low and it is easy to pilling. According to the SMS nonwoven fabric, since the meltblown layer is between the spunbond layers, it is possible to improve the blood barrier properties while preventing breakage and pilling.

[0031] According to a preferred embodiment, based on the invention of any one of embodiments 1 to 13, the invention of embodiment 14 may have the following features. The plurality of sheets include a first sheet and a second sheet located more outwardly than the first sheet. The air permeability resistance value of the first sheet is less than 0.60 kPa·s / m. The first sheet is subjected to an electrification process. The bacterial droplet capture efficiency (BFE) of the first sheet is more than 95%. The first sheet is a sheet material with excellent air permeability and capture properties, which can further exert the effect of obtaining air permeability while improving the dust-proofness and blood barrier properties of the wearer's exhaled breath and the external air inhaled by the wearer. Moreover, since an air permeability path is provided, the air permeability can be further improved by the synergistic effect of the effect of improving the air permeability of the first sheet itself and the effect of improving the air permeability of the mask main body by utilizing the air permeability path.

[0032] According to a preferred embodiment, based on any one of the inventions of Schemes 1 to 14, the invention of Scheme 15 may have the following features. The plurality of sheets include a first sheet and a second sheet located outwardly relative to the first sheet. The second sheet is waterproof. The thickness of the second sheet is greater than 0.45 mm. The weight per unit area of ​​the second sheet is 65 g / m 2 According to such a second sheet layer, it is possible to suppress blood from penetrating into the mask or suppress blood from passing through the second sheet layer, thereby further improving the blood barrier properties.

[0033] According to a preferred embodiment, based on the invention of any one of embodiments 1 to 15, the invention of embodiment 16 may have the following features. The plurality of layers include a first layer, a second layer located more outward than the first layer, and a third layer located between the first layer and the second layer. The air permeability of the first layer is higher than that of the second layer. The third layer is a non-woven fabric. According to this embodiment, since the third layer is provided, the thickness and weight per unit area of ​​the mask body become larger, which can improve the dust collection efficiency and blood barrier properties. In addition, since the air permeability of the first layer located on the wearer's side is relatively high, the air permeability can be further improved by the synergistic effect of improving the air permeability of the first layer itself and improving the air permeability of the mask body by utilizing the air permeability path.

[0034] (2) Mask of the first embodiment

[0035] The following describes a first embodiment of a mask 1 with reference to the accompanying drawings. In the following drawings, identical or similar components are denoted by identical or similar reference numerals. However, it should be noted that the drawings are schematic and that the proportions of dimensions and other aspects may differ from reality. Therefore, specific dimensions and other aspects should be determined based on the following description. Furthermore, the surfaces may contain components with different dimensional relationships and proportions. Figure 1 This is a side view of the mask according to the first embodiment in a folded state. Figure 2 This is a perspective view of the mask according to the first embodiment in the unfolded state. Figure 3 It is along Figure 2 The mask 1 can be disposable or reusable. The mask 1 can be worn to protect the wearer from droplets, pollen, dust, blood, etc.

[0036] The mask 1 has an inward direction Z1 facing the wearer's face, an outward direction Z2 opposite thereto, a longitudinal direction Y corresponding to the wearer's vertical direction, and a transverse direction X corresponding to the wearer's horizontal direction. The mask 1 may include a mask body 10 and a pair of ear loops 40. The inward direction Z1 is toward the inner surface of the mask, and the outward direction Z2 is toward the outer surface of the mask. The mask body 10 is configured to cover at least the wearer's mouth. The mask body 10 is configured to cover at least the wearer's mouth, and may be configured to cover both the nose and mouth. At least a portion of the mask body 10 is breathable. The mask body 10 includes multiple sheet layers 20 and a joint 30 that joins the sheet layers 20. The sheet layers 20 may include a first sheet layer 21 and a second sheet layer located more outwardly than the first sheet layer 21. The first sheet layer 21 may constitute the inner surface of the mask 1, and the second sheet layer 22 may constitute the outer surface of the mask.

[0037] The joint 30 only needs to join at least the sheets 20 to each other, and may also join other components (such as the ear hook 40) together with the sheet 20. In addition, the joint 30 only needs to join at least two sheets 20 to each other. In the case of a system with three or more sheets 20, two sheets 20 may be joined without joining the remaining sheets. The joint 30 can be formed by a method using heat or ultrasonic welding, a method using an adhesive, etc. The joint 30 has an outer edge joint 31 provided on the outer edge of the mask body 10. Here, the outer edge of the mask body 10 is the outer edge of the mask body 10 when viewed from above, and the outer edge portion is the portion within a range of 10 mm from the outer edge. Since the sheets 20 are joined to each other by the outer edge joint 31, the misalignment of the sheets 20 can be suppressed, and the dustproofness can be improved. Because the joint is located at the outer edge of the mask body 10 (having an outer edge joint), curling of the layers at the outer edge of the mask body can be suppressed, and the dust resistance at the outer edge of the mask body can be improved. Furthermore, the outer edge joint 31 can be formed along the outer edge of the mask body 10, but not across the entire outer edge of the mask body 10. In other words, a non-joined portion extending along the outer edge (a portion not formed with the outer edge joint 31) can be provided in a portion of the outer edge of the mask body 10. This non-joined portion constitutes the ventilation opening 51 described below.

[0038] Furthermore, in a configuration where the outer edge joint 31 is composed of a plurality of dot-shaped joints, if the intervals between the joints are less than 5 mm, the intervals between the joints do not constitute a non-joined portion, but rather constitute the outer edge joint 31. In a configuration where the outer edge joint 31 is composed of a plurality of dot-shaped joints, if the intervals between the joints are 5 mm or greater, the intervals between the joints constitute a non-joined portion. Furthermore, the joint 30 of this embodiment is a central joint 32 located at the center of the mask body 10 in the transverse direction X. The portion of the central joint 32 located at the outer edge of the mask body 10 constitutes the outer edge joint 31. In a modified embodiment, the central joint 32 and the outer edge joint 31 may be provided separately.

[0039] The joint 30 may include a central joint 32 for joining the sheets 20 to each other in the center of the transverse direction X of the mask body 10. The central joint 32 may be continuously provided in the longitudinal direction Y of the mask body 10. The central joint 32 may be provided in the longitudinal direction Y of the mask body 10. Figure 1 In the folded state shown, the folded portion is bent in the longitudinal direction Y. In more detail, Figure 1 In the folded state shown, the center of the central joint 32 in the longitudinal direction Y protrudes outward in the transverse direction X relative to the ends of the central joint 32 in the longitudinal direction, and has a substantially curved shape that is convex in the transverse direction X. Therefore, the mask body 10 is Figure 2 In the unfolded state (when worn by a wearer), a three-dimensional shape (three-dimensional structure) that is concave relative to the wearer's face can be formed. Furthermore, in a modified embodiment, the mask body 10 that is flat in the unfolded state (e.g., the mask of the third embodiment) may not have the central joint 32, but may instead have a central fold extending in the longitudinal direction Y at the center in the transverse direction X.

[0040] The ear hooks 40 are connected to either side of the mask body 10 in the transverse direction X. The ear hooks 40 can be formed separately from the mask body 10 or integrated with it. In this embodiment, the ear hooks 40 are formed separately from the mask body 10 and joined to the two sides of the mask body 10 via the ear hook joints 25. The ear hooks 40 are formed with notches 41, which are attached to the wearer's ears when worn. The notches 41 can be linear slits extending from the outer edges of the ear hooks or holes provided separately from the outer edges of the ear hooks. The ear hooks 40 can be joined to the mask body 10 in the inward direction Z1 or outward direction Z2. The ear hook joints 25 can extend in the longitudinal direction Y. Multiple ear hook joints 25 can be formed at intervals in the longitudinal direction Y, or they can be formed continuously in the longitudinal direction Y. The ear hooks 40 can be strip-shaped. In this embodiment, the band-shaped shape refers to a shape having a certain width, for example, a width of 5 mm or greater. Furthermore, the band-shaped shape can be longer in the width direction than in the thickness direction. Because the ear hooks 40 are band-shaped, they provide a gentle contact with the ears, enhancing the wearing experience. Furthermore, the ear hooks 40 can be stretchable in the transverse direction X, and can have greater extensibility than the sheet 20 that constitutes the mask body 10.

[0041] Next, the structure for improving both the droplet protection and breathability of the mask 1 will be described in detail. The mask body 10 includes multiple sheet layers 20. Since the mask body 10 includes multiple sheet layers 20, these multiple sheet layers 20 can be utilized to improve droplet protection. An outer edge joint 31 is provided at the outer edge of the mask body 10. The sheet layers 20 are joined together using the outer edge joint 31, leveraging the integrated filtering effect of the sheet layers 20 and improving dustproofness and blood barrier properties. Furthermore, an air passage 50 is provided between the sheet layers 20, extending at least along the planar direction of the sheet layers 20 and serving as a passage for air. The air passage 50 is formed by the unjoined portions of the sheet layers 20. A ventilation opening 51 of the air passage 50 is provided at the outer edge of the mask body 10. The ventilation opening 51 is provided at the end of the air passage 50, serving as the entrance and exit of air in the air passage 50. The ventilation opening 51 is formed at the outer edge of the mask body 10, located near the outer edge of the mask body 10. Therefore, air in the ventilation path 50 easily flows in and out through the ventilation opening 51, thereby improving the breathability of the mask body 10. Therefore, the mask 1 of this embodiment can improve both droplet protection and breathability.

[0042] The length of the ventilation opening 51 along the outer edge of the mask body 10 can be 5 mm or greater. When the spacing between the outer edge joints 31 extends in the transverse direction X, the length of the ventilation opening 51 along the outer edge refers to the length of the spacing between the outer edge joints 31 (the ventilation opening) in the transverse direction X. When the spacing between the outer edge joints 31 extends in the longitudinal direction Y, the length of the ventilation opening 51 along the outer edge refers to the length of the spacing between the outer edge joints 31 (the ventilation opening) in the longitudinal direction Y. In this embodiment, the ventilation opening 51 is formed between the ear strap joints 25 and the central joint 32 and extends in the transverse direction X. Therefore, the length of the ventilation opening 51 along the outer edge refers to the length of the ventilation opening 51 in the transverse direction. By setting the length of the ventilation opening to 5 mm or greater, air in the ventilation path 50 can be easily flowed in and out through the ventilation opening, thereby appropriately improving the breathability of the mask body 10. Preferably, the length of the ventilation opening 51 may be greater than 10 mm, and more preferably, the length of the ventilation opening may be greater than 20 mm.

[0043] The ventilation opening 51 can be one, but preferably multiple. Providing multiple ventilation openings 51 forms an air inlet and outlet for the ventilation path 50, facilitating the flow of air in and out. At least one ventilation opening 51 can be located below the center of the mask 1 in the longitudinal direction Y. The ventilation opening 51 located below the center of the mask 1 in the longitudinal direction Y can direct exhaled air toward the bottom of the mask 1. By directing exhaled air downward, the amount of exhaled air directed toward the top of the mask 1 is reduced, thereby preventing fogging of glasses and dry eyes. The ventilation openings 51 in this embodiment include a lower ventilation opening 512 located below the center of the mask 1 in the longitudinal direction Y, and an upper ventilation opening 511 located above the center of the mask 1 in the longitudinal direction Y. This structure facilitates improved air permeability throughout the entire longitudinal direction Y of the mask body 10. In a modified embodiment, the ventilation openings 51 may include only the lower ventilation opening 512. According to this embodiment, the exhaled air guided toward the upper side of the mask 1 can be reduced, thereby effectively suppressing fogging of glasses and dry eyes.

[0044] The ventilation path 50 extends along the longitudinal direction Y. The ventilation openings 51 at either end of the ventilation path 50 can be arranged across the center of the mask 1 in the longitudinal direction Y. Specifically, the ventilation openings 51 include an upper ventilation opening 511 and a lower ventilation opening 512, which form the opening of the same ventilation path 50. The upper ventilation opening 511 is located above the center of the mask 1 in the longitudinal direction Y, while the lower ventilation opening 512 is located below the center of the mask 1 in the longitudinal direction Y. According to this embodiment, the ventilation openings 51 are formed on both sides, above and below the center of the mask 1 in the longitudinal direction Y, giving the ventilation path 50 a shape that extends in the vertical direction (longitudinal direction). This allows air to flow in the vertical direction when worn, ensuring breathability within the mask body 10. Furthermore, the configuration extending in the longitudinal direction Y in this embodiment includes not only configurations parallel to the longitudinal direction Y but also configurations inclined at an angle of 45 degrees or less relative to the longitudinal direction Y. Furthermore, the structure extending in the transverse direction X in this embodiment includes not only a structure parallel to the transverse direction X but also a structure inclined at an angle less than 45 degrees with respect to the transverse direction X.

[0045] The ventilation openings 51 can be arranged on both sides of the central joint 32 in the transverse direction X. More specifically, a first ventilation path 501, an upper ventilation opening 511 of the first ventilation path 501, and a lower ventilation opening 512 of the first ventilation path 501 can be provided on one side of the central joint 32 in the transverse direction X, while a second ventilation path 502, an upper ventilation opening 511 of the second ventilation path 502, and a lower ventilation opening 512 of the second ventilation path 502 can be provided on the other side of the central joint 32 in the transverse direction X. According to this embodiment, the ventilation openings 51 are arranged on both sides of the central joint 32, thereby improving the air permeability of the mask body 10 on both sides. By uniformly improving the air permeability on both sides of the mask body 10, air passes through a larger area of ​​the entire mask body, thereby reducing the pressure inside the mask and improving the air permeability of the mask body. In the embodiment in which the central joint 32 is not provided but a central fold is formed, ventilation openings 51 may be provided on both sides of the central joint 32 in the transverse direction X. This embodiment can also improve the air permeability on both sides of the mask body 10 .

[0046] A pair of ventilation openings 51 can be arranged between the ear strap joint 25 and the central joint 32, across the center of the mask 1 in the longitudinal direction Y. The ear strap joint 25 is provided on one side of the mask body 10 in the transverse direction X and the other side of the mask body 10 in the transverse direction X. A first ventilation path 501, an upper ventilation opening 511 of the first ventilation path 501, and a lower ventilation opening 512 of the first ventilation path 501 are provided between the ear strap joint 25 and the central joint 32 on one side in the transverse direction X. A second ventilation path 502, an upper ventilation opening 511 of the second ventilation path 502, and a lower ventilation opening 512 of the second ventilation path 502 are provided between the ear strap joint 25 and the central joint 32 on the other side in the transverse direction X. According to this embodiment, the ventilation path 50 can be provided between the central joint 32 and the ear strap joint 25. Since the ventilation path 50 and the ear strap joint 25 both extend in the longitudinal direction Y, it is easier to guide the air that collides with the ear strap joint 25 or the central joint 32 outward in the longitudinal direction Y and allow it to enter and exit through the ventilation opening 51.

[0047] In the embodiment where multiple ear strap joints 25 are provided extending along the longitudinal direction Y and spaced apart in the transverse direction X, the unjoined portions of the sheet 20 between the ear strap joints 25 can form ventilation paths 50. The outer portion of the mask body 10 is easily deformed due to its rounded shape along the cheeks when worn. When this outer portion of the mask body 10 deforms, the sheet 20 easily separates, improving the breathability of the mask body 10 through the ventilation paths 50.

[0048] The distance between the central joint 32 and the ear-hanging joint 25 in the transverse direction X can be varied. According to this embodiment, since the distance between the central joint 32 and the ear-hanging joint 25 is varied, air passing through the ventilation path 50 extending in the longitudinal direction Y is more likely to collide with the central joint 32 or the ear-hanging joint 25, causing convection. Therefore, all air in the ventilation path 50 can be moved in and out of the mask body 10. In this embodiment, it can be, for example, Figure 1 As shown, the distance in the transverse direction X between the central joint 32 and the ear strap joint 25 at the center of the mask 1 in the longitudinal direction Y is longer than the distance in the transverse direction X between the central joint 32 and the ear strap joint 25 at the upper end of the mask 1 in the longitudinal direction Y, and is also longer than the distance in the transverse direction X between the central joint 32 and the ear strap joint 25 at the lower end of the mask 1 in the longitudinal direction Y. Furthermore, the distance in the transverse direction X between the central joint 32 and the ear strap joint 25 at the upper end of the mask 1 in the longitudinal direction Y may be different from the distance in the transverse direction X between the central joint 32 and the ear strap joint 25 at the lower end of the mask 1 in the longitudinal direction Y.

[0049] The end portion of the central joint 32 in the longitudinal direction Y may have a curved portion that is bent inwards from the central portion of the central joint 32 in the longitudinal direction Y. The curved portion only needs to be bent inwards in the wearing state (expanded state) of the mask. Figure 1 In the folded state shown, the end of the central joint 32 in the longitudinal direction Y curves outward in the transverse direction X relative to the center of the central joint 32 in the longitudinal direction Y. Furthermore, when the mask 1 is unfolded, the end of the central joint 32 in the longitudinal direction Y is positioned inward in the direction Z1 relative to the center of the central joint 32 in the longitudinal direction Y, giving the mask body 10 a cup-shaped shape that covers the mouth. The curved portion of the central joint 32 makes it easier for the mask body 10 to bend to cover the corners of the mouth when worn. This curvature of the mask body facilitates separation of the sheet layers 20, facilitating the formation of ventilation paths and improving the breathability of the mask body 10.

[0050] The sheet layers 20 may not be joined to each other in areas other than the joints 30. Specifically, the sheet layers 20 may not be joined in areas other than the central joint 32 and the outer edge joint 31. In embodiments with ear loop joints 25, the sheet layers 20 may not be joined in areas other than the ear loop joints 25, the central joint 32, and the outer edge joint 31. The unjoined portions between the sheet layers 20 can function as ventilation paths 50. This embodiment allows for a wider ventilation path 50, further enhancing the breathability of the mask body.

[0051] The plurality of sheet layers 20 may be composed of sheets of the same material or of sheets of different materials. At least one of the sheet layers may be an SMS nonwoven fabric that has been subjected to an electrification process. Since the sheet layer 20 has been subjected to an electrification process, the dust capture property can be improved and the dustproof property can be improved. In addition, the SMS nonwoven fabric comprises a spunbond layer and a meltblown layer disposed between the spunbond layers. The fiber density of the meltblown layer is relatively fine, which can further improve the blood barrier property of the medical mask. However, the meltblown layer has a low breaking strength and is prone to pilling. According to the SMS nonwoven fabric, since the meltblown layer is between the spunbond layers, it is possible to improve the blood barrier property while preventing breakage and pilling. Preferably, the first sheet layer 21 and the second sheet layer 22 described later may be SMS nonwoven fabrics. Alternatively, the first sheet layer 21 and the second sheet layer 22 may also be point-bonded nonwoven fabrics.

[0052] It is appropriate that the air permeability and capture efficiency of the first layer 21 are preferably higher. In more detail, it is preferred that the first layer 21 be subjected to an electrification process. The wearer's exhaled breath and the external air inhaled by the wearer pass through the air permeable path 50 between the first layer 21 and the second layer 22 and pass through the first layer 21. Therefore, it is preferred that the first layer 21 be subjected to an electrification process to improve the dust capture property of the first layer 21. Preferably, the air permeability resistance value of the first layer 21 may be less than 0.60 kPa·s / m, the first layer 21 may be subjected to an electrification process, and the bacterial droplet capture efficiency (BFE) of the first layer 21 may be more than 95%. The first layer 21 thus constructed is a sheet material having excellent air permeability and capture properties, which can further exert the effect of obtaining air permeability while improving the dust-proofness and blood barrier properties of the wearer's exhaled breath and the external air inhaled by the wearer. Furthermore, the provision of the ventilation paths 50 can further improve the breathability by a synergistic effect of the effect of improving the breathability of the first sheet layer 21 itself and the effect of improving the breathability of the mask body 10 by the ventilation paths.

[0053] Preferably, the second layer 22 has a high blood barrier property. More specifically, the second layer 22 can be made of SMS nonwoven fabric. The fiber density of the meltblown layer included in the SMS nonwoven fabric is relatively fine, which can further improve the blood barrier property. The thickness of the second layer 22 can be greater than 0.45 mm, and the unit area weight of the second layer 22 can be 65 g / m 2 With this thickness and weight per unit area, blood is less likely to pass through the second layer 22, further improving the blood barrier properties. The second layer 22 can be waterproof, which can inhibit blood from seeping in from the outside of the mask. Furthermore, the second layer 22 can also have a high capture efficiency and can be subjected to an electrified process. This can improve the dust capture efficiency of the second layer 22 facing outward from the mask, reducing the amount of dust introduced into the mask.

[0054] Furthermore, the sheet 20 may include, in addition to the first sheet 21 forming the inner surface of the mask 1 and the second sheet 22 forming the outer surface of the mask 1, a third sheet (not shown) disposed between the first sheet 21 and the second sheet 22. The provision of the third sheet increases the thickness and weight per unit area of ​​the mask body 10, further improving the collection efficiency and blood barrier properties. The ventilation path 50 only needs to be located between the first sheet 21 and the second sheet 22. In embodiments in which the third sheet is provided, the ventilation path 50 may be located between at least one of the first sheet 21 and the third sheet or between the second sheet 22 and the third sheet. For example, the first layer 21 and the third layer may be unjoined in areas other than the joint 30 and the ear loop joint 25, with an air path formed between the first layer 21 and the third layer, and the second layer 22 and the third layer may be joined by a joint having a larger area than the first and third layers (e.g., entirely). This structure improves the air permeability of the mask 1 in the inward direction Z1 while suppressing the infiltration of blood, etc., from the outward direction Z2 of the mask 1. Furthermore, in another embodiment, the first layer 21 and the third layer may be unjoined in areas other than the joint and the ear loop joint 25, and the second layer 22 and the third layer may be unjoined in areas other than the joint and the ear loop joint 25, with an air path formed between the two layers. This structure further improves the air permeability of the mask body 10.

[0055] The third layer can be made of nonwoven fabric. A nonwoven third layer can further enhance the collection efficiency and barrier properties by utilizing the interfiber spaces between the fibers. Preferably, the third layer can be air-through nonwoven fabric. Air-through nonwoven fabrics have high hydrophilicity and diffusivity, dispersing blood that reaches the third layer and further enhancing the overall blood barrier properties of the mask body 10. Alternatively, the third layer can be a meltblown nonwoven fabric.

[0056] The air permeability of the first layer 21 can be higher than that of the second layer 22. This air permeability can be compared using the air permeability resistance value. Since the air permeability of the first layer 21 located on the wearer's side is relatively high, the air permeability can be further improved by the synergistic effect of improving the air permeability of the first layer 21 itself and improving the air permeability of the mask body 10 using the air permeable path 50. The layer 20 can be composed of a non-woven fabric or fabric with air permeability and a sheet material (such as a film) with low air permeability (or non-air permeability). However, since at least part of the mask body 10 needs to be air permeable, at least part of the layer 20 has air permeability. Preferably, the layer constituting the inner surface of the mask body 10 (the first layer 21 in this embodiment) can have air permeability. According to this structure, the air permeability of the inner surface of the mask body 10 can be ensured, ensuring the inhalation and exhalation of air. More preferably, the sheet layer positioned inwardly relative to the air passage 50 may be air-permeable. With this configuration, the sheet layer positioned inwardly relative to the air passage 50 ensures the flow of air in and out, and allows this air to flow in and out of the mask body 10 via the air passage 50, further improving the air permeability of the mask body 10. The sheet layer positioned outwardly relative to the air passage 50 does not need to be air-permeable, but by making all the sheet layers 20 air-permeable, the air permeability of the mask body 10 can be further improved.

[0057] As a preferred sheet structure, for example, the unit area weight of the first sheet 21 and the unit area weight of the second sheet 22 can be 65g / m 2 The above, preferably, the unit area weight of the first sheet layer 21 and the unit area weight of the second sheet layer 22 can be 70g / m 2 More than. In addition, the first layer 21 can be subjected to electrification processing while the second layer 22 can be subjected to electrification processing. The air permeability resistance value of the first layer 21 and the air permeability resistance value of the second layer 22 can be respectively less than 0.60 kPa·s / m. In addition, the air permeability resistance value in the state where the first layer 21 and the second layer 22 are overlapped can be less than 1.10 kPa·s / m. In addition, the thickness of the first layer 21 and the thickness of the second layer 22 can be respectively more than 0.45 mm. The unit area weight of the third layer can be lower than the unit area weight of the first layer 21 and the unit area weight of the second layer 22, and can preferably be 30 g / m 2 In addition, the exhalation resistance value of the mask 1 can be 6.5 Pa or less, preferably 6.0 Pa or less.

[0058] Here, the collection efficiency, the air permeability resistance value, and the exhalation resistance value were measured by the following method.

[0059] <Collection efficiency>

[0060] The measurement environment was set to a temperature of 20°C and a humidity of 60%.

[0061] (1) Cut a circular sample from any part of the mask body 10 to be measured. The sample includes a circular portion with a diameter of 100 mm (the measurement target area) and a remaining portion with a width of at least 5 mm around the circular portion. For example, a circular sample with a diameter of 120 mm is used. Since the remaining portion outside the circular portion with a diameter of 100 mm (the measurement target area) is not the measurement target, embossed portions and fused portions may also be present. When measuring the value of each layer, decompose it into each layer.

[0062] (2) In the mask performance tester AP-9000 (manufactured by Shibata Scientific Co., Ltd.), the sample is mounted on the dedicated flat jig of the tester (measurement range ).

[0063] (3) In the presence of NaCl: The particle size was adjusted to 0.5 mg / m 3 The gas (for example, air) is sucked into a space with a concentration of , through the sample at a flow rate of 30 L / min, and the particle concentration and pressure before the gas passes through the sample and the particle concentration after the gas passes through the sample are measured.

[0064] (4) Based on these measured values, the one-minute collection efficiency is calculated from the difference in particle concentration. The collection efficiency is an indicator of collection performance, and a higher collection efficiency indicates higher collection performance. Furthermore, if the mask body is too small to cut out a circular sample with a 100 mm diameter measurement area, a circular sample with a 50 mm diameter measurement area is cut out.

[0065] <Expiratory resistance value>

[0066] The measurement environment was set to a temperature of 20°C and a humidity of 60%.

[0067] (1) Prepare the mask to be measured.

[0068] (2) In the mask performance tester AP-9000 (manufactured by Shibata Scientific Co., Ltd.), the mask is mounted on a dedicated head-shaped jig. The head-shaped jig is included with the AP-9000, and its detailed dimensions are based on the Aeronautical Medical Experimental Team's "Body Measurements of Air Self-Defense Force Members - Ergonomic Data for the Design of Equipment, etc." (1972). (The air hole extends from the corner of the mouth to the measuring device, and its diameter is 50 mm.)

[0069] (3) In the presence of NaCl: The particle size was adjusted to 0.5 mg / m 3In a space containing a gas (for example, air) with a concentration of , the gas is sucked at a flow rate of 30 L / min through the sample, and the pressure before and after the gas passes through the sample is measured.

[0070] (4) Based on these measured values, the pressure loss, or expiratory resistance value, is calculated from the pressure difference. The expiratory resistance value is an indicator of air permeability, with lower expiratory resistance values ​​indicating higher air permeability. In other words, the expiratory resistance value indicates air permeability when the device is attached to a person's head.

[0071] <Breathability resistance value>

[0072] The measurement environment was set to a temperature of 20°C and a humidity of 60%.

[0073] (1) Prepare the mask to be measured, disassemble the main body of the mask, and separate it into the layers to be measured.

[0074] (2) In the mask performance tester AP-9000 (manufactured by Shibata Scientific Co., Ltd.), the sample is mounted on the dedicated flat jig of the tester (measurement range ).

[0075] (3) In the presence of NaCl: The particle size was adjusted to 0.5 mg / m 3 In a space containing a gas (for example, air) with a concentration of , the gas is sucked at a flow rate of 30 L / min through the sample, and the pressure before and after the gas passes through the sample is measured.

[0076] (4) Based on these measured values, the pressure loss, or air resistance value, is calculated from the pressure difference. The air resistance value is an indicator of air permeability, with lower air resistance values ​​indicating higher air permeability. In other words, the air resistance value indicates the air permeability of the device when mounted on a flat plate.

[0077] (3) Mask of the second embodiment

[0078] Next, refer to Figure 4 A mask 1X according to a second embodiment will be described. Figure 4This is a perspective view of the unfolded state of the mask 1X according to the second embodiment. In addition, in the following description, the same figure marks are used for the same structures as the first embodiment described above, and the description is omitted. The mask body 10 of the mask 1X according to the second embodiment has a nose fitting member 60. The nose fitting member 60 is bonded to the first layer 21 of the first layer 21 and the second layer 22. In other words, the nose fitting member 60 is bonded to the first layer 21 but not to the second layer 22. According to this structure, by making the first layer 21 close to the nose fitting member 60, it is easy to form a distance between the first layer 21 and the second layer 22. By forming a distance between the layers, it is easy to generate air flow between the layers, which can improve the air permeability of the mask body 10. The air flow path 50 can be provided between the first layer 21 and the second layer 22. With this structure, the nose fitting member 60 brings the first sheet 21 into close contact, making it easier to create a distance between the first and second sheets 21, 22. This facilitates the formation of an air path between the first and second sheets 21, 22, improving the breathability of the mask body 10. Preferably, at least a portion of the nose fitting member 60 can be arranged so as to overlap the air path 50 in the thickness direction. With this structure, the first sheet 21 is in close contact with the skin via the nose fitting member 60, allowing the diameter of the air path to be increased.

[0079] The mask 1X of the second embodiment is provided with outer edge joints 31 at the upper and lower ends of the mask body 10. The outer edge joints 31 are located on either side of the center of the mask body 10 in the transverse direction X. The area between the left and right outer edge joints 31 is where the first and second layers 21 and 22 are not joined, and constitutes a ventilation opening 51 of the ventilation path 50. An upper ventilation opening 511 is provided between the outer edge joints 31 provided at the upper end of the mask body 10, spanning the center of the mask body 10 in the transverse direction X. A nose fitting member 60 is provided near the upper ventilation opening 511 (e.g., within a range of 20 mm). A lower ventilation opening 512 is provided between the outer edge joints 31 provided at the lower end of the mask body 10, spanning the center of the mask body 10 in the transverse direction X. This mask 1X improves the air permeability of the center of the mask body 10 in the transverse direction X, located near the mouth and nose, and enhances the wearing comfort.

[0080] (4) Mask of the third embodiment

[0081] Next, refer to Figure 5 and Figure 6 A mask 1Y according to a third embodiment will be described. Figure 5 This is a side view of the mask 1Y according to the third embodiment in a folded state. Figure 6This is a perspective view of a mask according to a third embodiment in its unfolded state. In the folded state, the mask 1Y according to the third embodiment has the mask body 10 unfolded at its center in the transverse direction X, and the ear straps 40 folded to overlap the mask body 10. The mask body 10 is formed with multiple pleats extending in the transverse direction X, allowing it to unfold in the longitudinal direction Y when worn. The outer edge joint 31, serving as the joint 30, is formed along the outer edge of the mask body 10. On the outer side of the mask body 10 in the transverse direction X, a non-joined portion without the outer edge joint 31 is formed within a certain range (at least 5 mm) in the longitudinal direction Y. This non-joined portion constitutes a ventilation opening 51. The ventilation openings 51 are located at either end of a ventilation path 50 extending in the transverse direction X, one on either side of the center of the mask body 10 in the transverse direction X. With this structure, the ventilation openings are formed on both the left and right sides of the center of the mask in the transverse direction X, forming a ventilation path extending in the transverse direction. When worn, air can flow in the transverse direction X, ensuring the breathability of the mask body 10 .

[0082] (5) Other Implementation Methods

[0083] The present invention has been described in detail above using the aforementioned embodiments. However, it will be apparent to those skilled in the art that the present invention is not limited to the embodiments described herein. The present invention can be implemented with modifications and variations without departing from the spirit and scope of the invention as defined by the claims. Therefore, the descriptions in this specification are for illustrative purposes only and are not intended to limit the present invention in any way. For example, a mask may have only one of the ventilation paths 50 extending in the longitudinal direction Y and the ventilation paths extending in the transverse direction X, or it may have both ventilation paths extending in the longitudinal direction Y and the ventilation paths extending in the transverse direction X. Furthermore, the mask may be a dust mask for protection against viruses and pollen, or a medical mask due to its high blood barrier properties.

[0084] (6) Example

[0085] Next, the blood barrier properties and exhalation resistance values ​​based on the presence or absence of ventilation openings were measured using the masks of Examples 1 to 3 and Comparative Examples 1 to 6. The measurement results are shown in Table 1. The test conditions for each sample were the same except for the structure of the mask body 10. Example 1, Comparative Example 1 and Comparative Example 2 are composed of sheets of the same material, and the structure of the outer edge joint 31 is different. In addition, Example 2, Comparative Example 3 and Comparative Example 4 are composed of sheets of the same material, and the structure of the outer edge joint 31 is different. Example 3, Comparative Example 5 and Comparative Example 6 are composed of sheets of the same material, and the structure of the outer edge joint 31 is different. The masks of Examples 1, 2 and 3 are provided with ventilation openings 51. The ventilation opening 51 has an upper ventilation opening 511 and a lower ventilation opening 512, forming a ventilation path 50 extending along the longitudinal direction Y. The masks of Comparative Examples 1, 3, and 5 do not have a ventilation path 50 formed, and the sheets 20 are not fully joined to each other. Instead, they are joined using an outer edge joint 31 provided along the entire circumference of the outer edge of the mask body 10. The masks of Comparative Examples 2, 4, and 6 do not have a ventilation path 50 formed, and the sheets are fully bonded to each other. The exhalation resistance value is measured based on the above method. Blood barrier properties are measured using the test method of JIS T9001 and ASTM F1862 and are classified as Grade 1, Grade 2, or Grade 3 in the quality standards for medical masks. Grade 3 has the highest blood barrier properties, and Grade 1 has the lowest blood barrier properties.

[0086] [Table 1]

[0087]

[0088] It was found that the provision of ventilation openings improves breathability. Specifically, a comparison of Example 1, Comparative Example 1, and Comparative Example 2, all made of the same sheet material, shows that Example 1 has the lowest exhalation resistance and the highest breathability. Similarly, a comparison of Example 2, Comparative Example 3, and Comparative Example 4, all made of the same sheet material, shows that Example 2 has the lowest exhalation resistance and the highest breathability of the mask body. Similarly, a comparison of Example 3, Comparative Example 5, and Comparative Example 6, all made of the same sheet material, shows that Example 3 has the lowest exhalation resistance and the highest breathability of the mask body. These results demonstrate that the presence of the ventilation path 50 and ventilation opening 51 enhances the breathability of the mask body 10. A comparison of blood barrier properties using samples made of the same sheet material reveals that Comparative Examples 2, 4, and 6, where the sheets are fully bonded, have lower blood barrier properties. On the other hand, Examples 1 to 3, Comparative Examples 1, 3, and 5, where the sheets are not fully bonded, have higher blood barrier properties. These results indicate that, when the sheets are not fully bonded to each other, air layers are formed between the sheets. The presence of the air layers makes it difficult for blood to pass through in the thickness direction, thereby achieving high blood barrier properties.

[0089] Furthermore, the mask bodies of Examples 2, Comparative Examples 3, and 4 have a third layer added compared to Examples 1, 1, and 2. The addition of the third layer reduces the exhalation resistance, meaning that air permeability decreases, but blood barrier properties increase. Therefore, by varying the placement of the third layer depending on the intended use of the mask, such as medical applications, a mask with desired air permeability and blood barrier properties can be obtained.

[0090] Next, the results of measuring the air permeability resistance values ​​of the sheets of Example 1 and Example 2 are shown in Table 2. The first sheet (SMS nonwoven fabric with a unit weight of 70 / m 2 The air permeability resistance value of the first layer (SMS nonwoven fabric with a unit weight of 70 / m2) was 0.598 kPa·s / m2, which was less than 0.60 kPa·s / m2. 2 With electrification processing) and the second layer (SMS non-woven fabric unit area weight of 70 / m 2 The air permeability resistance value of the sheet layer (without electrification processing) is 1.094 kPa·s / m, which is less than 1.10 kPa·s / m. As described above, it can be seen that good air permeability can be obtained in the mask of any one of Examples 1 and 2, and it can be seen that the air permeability resistance value of the first sheet layer 21 can be less than 0.60 kPa·s / m, and the air permeability resistance value of the state in which the first sheet layer 21 and the second sheet layer 22 are overlapped can be less than 1.10 kPa·s / m.

[0091] [Table 2]

[0092]

[0093] Note that the entire contents of Japanese Patent Application No. 2023-031790 filed on March 2, 2023 are incorporated herein by reference.

[0094] Industrial applicability

[0095] According to this aspect, a mask capable of improving both droplet prevention and breathability can be provided.

[0096] Description of Reference Numerals

[0097] 1. 1X, 1Y, mask; 10. mask body; 20. sheet layer; 30. joint; 31. outer edge joint; 40. ear loop; 50. ventilation path; 51. ventilation opening; X, horizontal direction; Y, longitudinal direction; Z1, inward direction; Z2, outward direction.

Claims

1. A mask comprising: the longitudinal direction, which corresponds to the up-down direction of the wearer; a transverse direction, which corresponds to the left-right direction of the wearer; and A breathable mask body covering at least the wearer's mouth, wherein The mask body has a plurality of sheet layers and a joint portion for joining the sheet layers to each other. The joint portion includes an outer edge joint portion provided on the outer edge of the mask body portion. An air path is provided between the sheets, and the air path extends at least along the plane direction of the sheets and serves as an air passage. A ventilation opening serving as an inlet and outlet of air in the ventilation path is provided at an outer edge of the mask body.

2. The mask according to claim 1, wherein The length of the ventilation opening in a direction along the outer edge of the mask body is greater than or equal to 5 mm.

3. The mask according to claim 1 or 2, wherein: The ventilation opening is arranged below the center of the mask in the longitudinal direction.

4. The mask according to claim 3, wherein The ventilation openings arranged at both ends of the ventilation path are arranged across the center of the mask in the longitudinal direction.

5. The mask according to claim 1 or 2, wherein: The ventilation openings arranged at both ends of the ventilation path are arranged across the center of the mask in the transverse direction.

6. The mask according to claim 1 or 2, wherein: The joint portion includes a central joint portion for joining the sheet layers to each other at the center in the transverse direction of the mask body. The ventilation openings are respectively arranged on both sides of the central joint in the transverse direction.

7. The mask according to claim 6, wherein The mask has a pair of ear hooks connected to both sides of the mask body in the transverse direction. The mask body and the ear hanging portion are joined by means of an ear hanging joint portion extending along the longitudinal direction. A pair of the ventilation openings are arranged across the center of the mask in the longitudinal direction. The pair of ventilation openings are arranged between the ear hook joint portion and the central joint portion.

8. The mask according to claim 7, wherein The distance between the central joint portion and the ear hook joint portion in the transverse direction varies.

9. The mask according to claim 1 or 2, wherein: The joint portion includes a central joint portion for joining the sheet layers to each other at the center in the transverse direction of the mask body. An end portion of the central joint portion in the longitudinal direction has a curved portion that curves inward relative to a central portion of the central joint portion in the longitudinal direction.

10. The mask according to claim 1 or 2, wherein: The sheet layers are not joined to each other in regions other than the joining portions.

11. The mask according to claim 1 or 2, wherein: The plurality of sheet layers include a first sheet layer and a second sheet layer located outward from the first sheet layer. The mask body has a nose fitting member for fitting the mask body to the wearer's nose. The nose fitting member is bonded to the first sheet layer of the first sheet layer and the second sheet layer.

12. The mask according to claim 11, wherein The ventilation path is provided between the first sheet layer and the second sheet layer.

13. The mask according to claim 1 or 2, wherein: At least one of the sheet layers is an SMS nonwoven fabric subjected to an electrification process.

14. The mask according to claim 1 or 2, wherein: The plurality of sheet layers include a first sheet layer and a second sheet layer located outward from the first sheet layer. The air permeability resistance value of the first sheet layer is less than 0.60 kPa·s / m, The first sheet is subjected to electrification processing, The bacterial droplet collection efficiency (BFE) of the first layer is greater than 95%.

15. The mask according to claim 1 or 2, wherein: The plurality of sheet layers include a first sheet layer and a second sheet layer located outward from the first sheet layer. The second layer is waterproof. The thickness of the second layer is greater than 0.45 mm. The unit area weight of the second layer is 65g / m 2 above.

16. The mask according to claim 1 or 2, wherein: The plurality of sheet layers include a first sheet layer, a second sheet layer positioned outward from the first sheet layer, and a third sheet layer positioned between the first sheet layer and the second sheet layer. The air permeability of the first layer is higher than that of the second layer. The third sheet layer is non-woven fabric.

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