mask

Abstract

To provide a mask in which the worn mask is hardly displaced, and harmful particles, pathogenic bacteria or the like hardly enter the inside of the mask.SOLUTION: A mask has, on a wearer side of a mask body, a strip-shaped cushioning material having a foam extending in a right-eft direction on an upper edge of the mask body covering the wearer's mouth and nose. A surface of the strip-shaped cushioning material has a high dynamic friction coefficient. By arranging the strip-shaped cushioning material with a foam that is easily deformed in a thickness direction, the strip-shaped cushioning material is deformed following the shape of the face when the mask is worn, which results in a small gap between the mask and the face. In addition, since the cushioning material has a high dynamic friction coefficient, the mask is hardly displaced when worn. Thus, harmful particles, pathogenic bacteria, and the like hardly enter the inside of the mask.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a mask covering the mouth and nose.

Background Art

[0002] In a mask covering the mouth and nose, a member for closing the gap between the upper edge of the mask and the nose is provided for the purpose of improving the adhesion between the face and the mask and preventing the intrusion of harmful particles, pathogenic bacteria and the like. For example, Patent Document 1 (Japanese Registered Utility Model No. 3135320) discloses a three-dimensional mask provided with a strip-shaped low resilience pad material that closes the gap between the upper edge of the three-dimensional mask and the nose. Patent Document 1 discloses that the pad material, which uses polyurethane foam provided on the three-dimensional mask, conforms to the shape of the gap between the upper edge of the mask body and the recess extending from the user's nose to both cheeks, closes the gap therebetween, is crushed and deformed between the mask body and the user's face, and reliably closes the gap.

Prior Art Literature

Patent Literature

[0003]

Patent Literature 1

Summary of the Invention

Problem to be Solved by the Invention

[0004] The three-dimensional mask disclosed in Patent Document 1 can close the gap between the upper edge of the mask and the user's nose by means of the pad material, and has high adhesion between the face and the mask. However, when the mask is worn, changes in facial expression of the mask wearer or the action of external force may cause the mask to move, shifting the wearing position of the mask, and harmful particles, pathogenic bacteria and the like may enter the inside of the mask through the gap generated by the shifted mask.

[0005] The present invention has been made under such circumstances, and an object of the present invention is to provide a mask that is less likely to slip after being worn, and makes it difficult for harmful particles, pathogenic bacteria and the like to enter the interior of the mask. [Means for Solving the Problem]

[0006] The invention according to claim 1 of the present invention is a mask, comprising: a mask main body covering a user's mouth and nose; fastening strings attached to both left and right sides of the mask main body; and a band-shaped cushioning member provided with a foam, wherein the cushioning member is provided extending in the left-right direction on an upper edge of the mask main body on a wearer side of the mask main body, wherein a dynamic friction coefficient of a surface of the cushioning member measured by the following [Measurement Method] is 0.86 or more. [Measurement Method] (1) Cutting the cushioning member constituting the mask into a rectangle of 1.5 cm×8.0 cm to obtain a section. Then, adhering an adhesive tape to one main surface of said section to obtain a measurement sample. For a foam having a skin layer formed by resin solidified into a film on one main surface of the foam, adhere an adhesive tape to the main surface having the skin layer of the foam; for a foam having said skin layer on both main surfaces of the foam, or a foam having no said skin layer on the foam, adhere an adhesive tape to any one main surface of said foam. (2) Adhering the side of the measurement sample having the adhesive tape to a sample stage (made of stainless steel) of a static and dynamic friction tester (manufactured by Trinity Lab Inc., product number: TL201Tt). (3) The tactile contact attached to the static and dynamic friction tester (area: 2 cm 2 ) is attached to a contact terminal of the static and dynamic friction tester, such that the entire plane of the tactile contact contacts 1 cm inward from an end in a long side direction of the measurement sample. (4) While applying a load of 100 g to the contact terminal to apply a load to the measurement sample, moving the tactile contact on the measurement sample to the other end in the long side direction of the measurement sample under conditions of a speed of 5 mm / sec. and a movement distance of 3 cm. The minimum value F of the dynamic friction force measured during said movement 1min (unit: N) is recorded. (5) The minimum value F of the dynamic friction force obtained as described above 1minThe value of the coefficient of kinetic friction (μ1') is calculated by substituting into the following equation. Note that N (unit: N) represents the normal force, and in this measurement method, the normal force is 0.98 (N) because a load of 100g was applied to the contact terminal in (4). μ1' = F 1min It is " / N".

[0007] The invention according to claim 2 of the present invention is "a mask according to claim 1, wherein the coefficient of dynamic friction of the surface of the cushioning material measured by the following [measurement method 2] is 0.76 or more." [Measurement method 2] (1) Cut the cushioning material constituting the mask into a rectangle of 1.5 cm × 8.0 cm to obtain a section. Then, attach adhesive tape to one main surface of the section to obtain a sample for measurement. Note that for foams having a skin layer of resin solidified into a film on one main surface of the foam, attach adhesive tape to the main surface of the foam having the skin layer, and for foams having the skin layer on both main surfaces of the foam, attach adhesive tape to either one of the main surfaces of the foam. (2) Attach the side of the sample for measurement with adhesive tape to the sample stand (made of stainless steel) of a static friction measuring machine (manufactured by Trinity Lab Co., Ltd., product number: TL201Tt). (3) Attach the tactile contact element (area: 2 cm²) attached to the static friction measuring machine. 2 (4) The tactile contact is attached to the contact terminal of the static friction measuring machine such that the entire flat surface of the tactile contact is in contact with the end of the long side of the measurement sample 1 cm inward. (5) A load of 300 g is applied to the contact terminal and the load is applied to the measurement sample, and the tactile contact is moved on the measurement sample to the other end of the long side of the measurement sample at a speed of 5 mm / sec. and a moving distance of 3 cm. The minimum value F of the dynamic friction force measured during this movement is 2min (Unit: N) Record the value of the kinetic friction force F obtained as described above. (5) The minimum value of the kinetic friction force F obtained as described above. 2min The value of the coefficient of kinetic friction (μ²') is calculated by substituting into the following equation. Note that N (unit: N) represents the normal force, and in this measurement method, the normal force is 2.94 (N) because a load of 300g was applied to the contact terminal in (4). μ²' = F 2min It is " / N".

[0008] The invention according to claim 3 of the present invention is "The mask according to claim 1 or 2, wherein the foam is a polyurethane foam."

[0009] The invention according to claim 4 of the present invention is "The mask according to claim 1 or 2, wherein the thickness of the cushioning material when a pressure of 0.5 kPa is applied is 2.0 mm or more."

[0010] The invention according to claim 5 of the present invention is "The amount of air passing through the cushioning material in the thickness direction measured by the Frazier method specified in JIS L 1096:2010 8.26 Method A is 56 (cm 3 / cm 2 / s) or less, the mask according to claim 1 or 2."

Effects of the Invention

[0011] The mask according to claim 1 of the present invention comprises, on the wearer side of the mask body, a band-shaped cushioning material provided with a foam extending in the left-right direction at the upper edge of the mask body that covers the user's mouth and nose, and the dynamic friction coefficient under a load of 100 g on a contact terminal, which assumes pressure from the cheeks of the face when the mask is worn, on the surface of the band-shaped cushioning material is as high as 0.86 or more. By having the band-shaped cushioning material provided with foam that is easily deformable in the thickness direction, the band-shaped cushioning material deforms following the shape of the face when the mask is worn, so that the gap between the mask and the face is small. Furthermore, since the dynamic friction coefficient of the cushioning material under a 100 g load on the contact terminal is high, the mask is less likely to slip when worn. For these reasons, the mask can be a mask that makes it difficult for harmful particles, pathogenic bacteria, and the like to invade the inside.

[0012] The mask according to claim 2 of the present invention has a high dynamic friction coefficient of 0.76 or higher at a load of 300g on the contact terminals of the cushioning material surface of the mask, assuming the pressure exerted by the nose area of ​​the face, where the cushioning material is compressed more significantly than the cheek area of ​​the face when the mask is worn. Because the dynamic friction coefficient at a load of 300g on the contact terminals is high, the mask is less likely to shift when worn, even in areas where the mask and the cushioning material are compressed more significantly by the face, such as the nose area. As a result, the mask can be made less likely to allow harmful particles and pathogens to enter the inside.

[0013] The mask according to claim 3 of the present invention is characterized in that the foam used in the cushioning material of the mask is polyurethane foam. Polyurethane foam tends to have a higher coefficient of dynamic friction compared to other foams such as polyolefin foam, and a mask having a strip-shaped cushioning material made of polyurethane foam has a high coefficient of dynamic friction of the strip-shaped cushioning material, making it less likely to shift when worn. As a result, it is possible to create a mask that is less likely to allow harmful particles and pathogens to enter the inside.

[0014] The mask according to claim 4 of the present invention has a cushioning material thickness of 2.0 mm or more. Having a cushioning material thickness of 2.0 mm or more allows the strip-shaped cushioning material to conform to the shape of the face when the mask is worn, resulting in a smaller gap between the mask and the face, making it more difficult for harmful particles and pathogens to enter the mask.

[0015] The mask according to claim 5 of the present invention has a volume of air passing through the thickness direction of the cushioning material by the Frazier method of 56 cm 3 / cm 2 The airflow rate is low, below ( / s). When the amount of air passing through the thickness direction is small, the amount of air passing through the top and bottom of the mask wearer is also small. As a result, when the mask is worn, harmful particles and pathogens are less likely to enter the inside of the mask from the outside via the buffer material, and consequently, the mask can be made less likely to allow harmful particles and pathogens to enter the inside. [Brief explanation of the drawing]

[0016] [Figure 1] This is a schematic rear view of the mask of the present invention, as seen from the wearer's side. [Figure 2] This is a schematic rear view of the mask of the present invention, as seen from the wearer's side, with the upper edge region indicated by diagonal lines. [Figure 3] This schematic rear view of the mask of the present invention, as seen from the wearer's side, shows the length from the edge of the cushioning material to the outer edge of the mask. [Modes for carrying out the invention]

[0017] The basic configuration of the mask of the present invention will be explained using Figure 1, which is a schematic rear view of the mask as seen from the wearer's side.

[0018] In this invention, various configurations can be appropriately selected to solve the problem.

[0019] The mask (1) according to the present invention mainly comprises a mask body (2), a fastening string (3), and a strip-shaped cushioning material (4) made of foam. The fastening strings (3) are attached to both the left and right sides of the mask body (2), and the cushioning material (4) is provided extending in the left-right direction from the upper edge (5) of the mask body (2) on the side where the mask body (2) is worn. The left-right direction of the mask body (2) refers to the direction perpendicular to the up-down direction of the wearer (the direction parallel to the direction of gravity for the wearer) when the wearer puts on the mask (1). The wearer's side of the mask body (2) refers to the side closer to the wearer (the side that is on the inside of the mask (1) from the wearer's perspective) when the wearer puts on the mask (1) on their face. Furthermore, the upper edge (5) of the mask body (2) refers to the area within 30 mm from the upper edge of the mask body (2) that aligns with the uppermost part of the wearer in the vertical direction when the wearer is wearing the mask (1), and which is located above the line segment connecting the center of gravity (6) of the mask body (2) and the tie string (3) that is located above the wearer among the tie strings (3) attached to both the left and right sides of the mask body (2), and is the area shown by the diagonal lines in Figure 2. Furthermore, "the cushioning material is provided on the upper edge of the mask body" means that the cushioning material is present in at least a part of the upper edge. It is preferable that the entire cushioning material is present on the upper edge of the mask body, as this makes the mask less likely to slip when worn.

[0020] First, the cushioning material (4) according to the present invention will be described in detail.

[0021] The mask (1) of the present invention has a strip-shaped cushioning material (4) made of foam that is easily deformable in the thickness direction, so that when the mask (1) is worn, the strip-shaped cushioning material (4) deforms to conform to the shape of the face, and the gap between the mask and the face is small. In addition, in order to prevent a gap from occurring between the wearer and the mask body (2), the cushioning material (4) may be provided not only on the upper edge on the wearer's side of the mask body (2), but also near edges other than the upper edge (near the lower edge, near the left and right edges).

[0022] The cushioning material (4) comprises a foam. The foam can be, for example, a polyurethane foam made from polyurethane resin, a polyolefin foam made from polyolefin resin, or a polystyrene foam made from polystyrene resin. However, polyurethane foam tends to have a higher coefficient of dynamic friction than other foams such as polyolefin foam, and a mask having a strip-shaped cushioning material made of polyurethane foam has a high coefficient of dynamic friction of the strip-shaped cushioning material and tends not to shift when the mask is worn. Therefore, polyurethane foam is preferred for the foam provided in the cushioning material.

[0023] Furthermore, the foam used in the cushioning material may be an open-cell flexible foam material in which closed cells account for less than 25% of the total volume, or an open-cell flexible foam material in which closed cells account for 25% or more of the total volume, as specified in JIS K6400-3:2011. However, open-cell flexible foam material is more easily deformed in the thickness direction compared to closed-cell flexible foam material. As a result, when the mask is worn, the strip-shaped cushioning material conforms better to the shape of the face, and the gap between the mask and the face is smaller. Therefore, an open-cell flexible foam material is preferred for the foam used in the cushioning material.

[0024] Furthermore, the foam in the cushioning material may have a skin layer formed by the solidification of resin into a film on one or both of its main surfaces. However, since the skin layer has a smooth surface, there is a risk that the coefficient of dynamic friction of the cushioning material having the foam with the skin layer will decrease. As a result, there is a risk that the mask having the cushioning material having the foam with the skin layer may shift when worn. Therefore, it is preferable that the foam in the cushioning material does not have the skin layer.

[0025] Furthermore, the cushioning material (4) may consist solely of foam, or it may be a laminate of foam with other materials such as nonwoven fabric.

[0026] The aforementioned cushioning material (4) has a high coefficient of dynamic friction of 0.86 or higher on its surface when a load of 100g is applied to the contact terminals, as measured by the following [measurement method]. The reason for applying a load of 100g is to simulate the pressure exerted by the cheeks of the face when wearing the mask. Furthermore, "main surface" below refers to the widest surface.

[0027] [Measurement method] (1) Cut the cushioning material constituting the mask into a rectangle measuring 1.5 cm x 8.0 cm to obtain a section. Then, attach adhesive tape to one main surface of the section to obtain a sample for measurement. Note that for foams having a skin layer formed by a film of solidified resin on one main surface, attach the adhesive tape to the main surface of the foam having the skin layer. For foams having the skin layer on both main surfaces, attach the adhesive tape to either one of the main surfaces of the foam. (2) Attach the side of the sample to be measured with adhesive tape to the sample stand (made of stainless steel) of the static friction measuring machine (manufactured by Trinity Lab Co., Ltd., model number: TL201Tt). (3) A tactile contact element attached to the static friction measuring machine (area: 2 cm²) 2 The tactile contactor is attached to the contact terminal of the static friction measuring machine such that the entire flat surface of the tactile contactor contacts the end of the sample in the long side direction, 1 cm inward. (4) A load of 100g is applied to the contact terminal and the tactile contact is moved on the measurement sample to the other end of the long side of the measurement sample at a speed of 5mm / sec. and a moving distance of 3cm. The minimum value F of the kinetic friction force measured during this movement is measured. 1min (Unit: N) Record (5) The minimum value F of the kinetic friction force obtained as described above 1min The value of the coefficient of kinetic friction (μ1') can be calculated by substituting it into the following formula. Note that N (unit: N) represents the normal force, and in this measurement method, the normal force is 0.98 (N) because a load of 100g was applied to the contact terminal in (4). μ1'=F 1min / N

[0028] As measured by the above [measurement method], the dynamic friction coefficient of the cushioning material (4) when a load of 100g is applied to the contact terminal is high at 0.86 or higher, which means that the mask is less likely to slip when worn and less likely to allow harmful particles and pathogens to enter the inside. The higher the dynamic friction coefficient measured by the above [measurement method], the less likely the mask is to slip when worn, so a value of 0.88 or higher is more preferable, and 0.90 or higher is even more preferable.

[0029] Preferably, the coefficient of dynamic friction of the surface of the cushioning material (4) is 0.76 or higher when a load of 300g is applied to the contact terminal as measured by [Measurement Method 2] below. The reason for applying a load of 300g is to estimate the pressure exerted by the nose area of ​​the face, which compresses the cushioning material more significantly than the cheek area of ​​the face when the mask is worn.

[0030] [Measurement method 2] (1) Cut the cushioning material constituting the mask into a rectangle measuring 1.5 cm x 8.0 cm to obtain a section. Then, attach adhesive tape to one main surface of the section to obtain a sample for measurement. Note that for foams having a skin layer formed by a film of solidified resin on one main surface, attach the adhesive tape to the main surface of the foam having the skin layer. For foams having the skin layer on both main surfaces, attach the adhesive tape to either one of the main surfaces of the foam. (2) Attach the side of the sample to be measured with adhesive tape to the sample stand (made of stainless steel) of the static friction measuring machine (manufactured by Trinity Lab Co., Ltd., model number: TL201Tt). (3) A tactile contact element attached to the static friction measuring machine (area: 2 cm²) 2 The tactile contactor is attached to the contact terminal of the static friction measuring machine such that the entire flat surface of the tactile contactor contacts the end of the sample in the long side direction, 1 cm inward. (4) A load of 300g is applied to the contact terminal and the tactile contact is moved on the measurement sample to the other end of the long side of the measurement sample at a speed of 5mm / sec. and a moving distance of 3cm. The minimum value F of the kinetic friction force measured during this movement is measured. 2min (Unit: N) Record (5) The minimum value F of the kinetic friction force obtained as described above 2min The value of the coefficient of kinetic friction (μ²') can be calculated by substituting it into the following formula. Note that N (unit: N) represents the normal force, and in this measurement method, the normal force is 2.94 (N) because a load of 300g was applied to the contact terminal in (4). μ2'=F 2min / N

[0031] As measured by [Measurement Method 2] above, a high coefficient of dynamic friction of the cushioning material (4) when a load of 300g is applied to the contact terminals makes it possible to create a mask that is less likely to slip when worn and that prevents harmful particles and pathogens from entering the inside. The higher the coefficient of dynamic friction measured by [Measurement Method 2] above, the less likely the mask is to slip when worn, so a value of 0.90 or higher is more preferable, and 1.00 or higher is even more preferable.

[0032] The ratio of the dynamic friction coefficient of the cushioning material (4) measured by the above [measurement method] to the dynamic friction coefficient of the cushioning material (4) measured by the above [measurement method 2], which is {(dynamic friction coefficient of the cushioning material (4) measured by [measurement method 2]) / (dynamic friction coefficient of the cushioning material (4) measured by [measurement method])} (hereinafter sometimes referred to as the dynamic friction coefficient ratio), is preferable to 1.01 or higher, 1.10 or higher, and more preferably 1.15 or higher, because the higher the ratio, the less likely the mask is to shift even if the cushioning material in the mask is greatly compressed when the mask is worn.

[0033] The amount of air passing through the thickness direction of the buffer material (4), measured by the Fragile method specified in JIS L 1096:2010 8.26 A, is small. The smaller the amount of air passing through the thickness direction of the buffer material (4), the less air will pass through the buffer material when it is installed in the mask, not only in the thickness direction of the buffer material but also in the vertical direction of the mask. Therefore, when the mask is worn, it is difficult for harmful particles and pathogens to enter the inside of the mask from the outside through the buffer material. As a result, the amount of air passing through the thickness direction of the buffer material (4) is 56 cm². 3 / cm 2 It is preferable that the air volume (airflow rate) is 30 (cm³ / s) or less. A smaller airflow rate makes it more difficult for harmful particles and pathogens to enter the inside of the mask, so the air volume (airflow rate) should be 30 (cm³ / s). 3 / cm 2 / s) or less is more preferable, and 5.0 (cm 3 / cm 2 / s) The following is even more preferred It's nice.

[0034] The length of the cushioning material (4) in the left-right direction on the mask body (2) having the cushioning material (4) is preferably 8.0 to 15.0 cm, more preferably 9.0 to 14.0 cm, and even more preferably 10.0 to 13.0 cm, so as to minimize gaps between the wearer's nose and the mask body (2). The length of the cushioning material (4) in the up-down direction on the mask body (2) is preferably 1.0 to 20.0 mm, more preferably 5.0 to 15.0 mm, and even more preferably 5.0 to 10.0 mm, so as to minimize gaps between the wearer's nose and the mask body. Note that the left-right and up-down lengths of the cushioning material are values ​​measured using a caliper as specified in JIS B7507:2016 "Calipers".

[0035] Furthermore, as shown in Figure 3, the shorter the length (7) from the left end of the cushioning material (4) in the direction in which the cushioning material (4) extends to the intersection point with the outer edge of the mask, or the shorter the length (8) from the right end of the cushioning material (4) in the direction in which the cushioning material (4) extends to the intersection point with the outer edge of the mask, the better the gap between the mask body and the user's face can be sealed, making it more difficult for harmful particles and pathogens to enter the inside of the mask. Therefore, a length of 4.0 cm or less is preferable, 2.0 cm or less is more preferable, and 1.5 cm or less is even more preferable. These lengths were also measured using the caliper.

[0036] The thickness of the cushioning material (4) when a pressure of 0.5 kPa is applied is preferably 2.0 mm or more, more preferably 2.2 mm or more, and even more preferably 2.4 mm or more, in order to prevent gaps from forming between the wearer's face and the mask body (2). The upper limit of the thickness of the cushioning material (4) measured under the above conditions is realistically 8.0 mm or less, and more realistically 7.0 mm or less, as the wearer may feel discomfort when wearing the mask. Note that this "thickness" refers to the length in the depth direction of the cushioning material in the mask (the length from the surface of the cushioning material (4) that contacts the mask body (2) to the surface that contacts the nose when the mask is worn). The reason for evaluating the thickness when a pressure of 0.5 kPa is applied is that when pressure is applied to a foam, the thickness of the foam may become extremely small, and in the case of such a foam, even if the thickness when unloaded is somewhat large, there is a risk of gaps forming between the wearer's face and the mask body. Furthermore, this thickness can be measured, for example, using a high-precision digital length measuring instrument (Mitutoyo Corporation, Lightmatic®).

[0037] The cushioning material (4) is integrated with the mask body (2). "Integrated" here means that the cushioning material (4) is fixed to the main surface of the mask body (2) and cannot be easily separated from the mask body (2). The method of fixing and integrating the cushioning material (4) to the main surface of the mask body (2) can be appropriately selected. For example, methods such as fixing with adhesive, double-sided tape, or adhesive tape, or fixing by welding the components of the mask body (2) and / or cushioning material (4) can be employed. Specifically, as adhesives, solution-based adhesives in which polymers such as synthetic resins are dissolved in water or organic solvents, reaction-based adhesives such as thermosetting adhesives, and hot-melt adhesives can be used. Methods of fixing by welding the components include ultrasonic welding and heat welding. Alternatively, the cushioning material may be fixed and integrated using staples or sewing thread.

[0038] Next, the mask body (2) and the fastening string (3) according to the present invention will be described in detail.

[0039] The mask body (2) is a component that primarily filters out the target substances in the outside air, enabling the supply of clean air to the wearer, and also prevents the spread of contaminants such as viruses expelled from the body to the outside.

[0040] The mask body (2) can be constructed using, for example, only one sheet of fabric (woven, knitted, nonwoven, etc.), breathable foam, or breathable film; it can be constructed by laminating multiple sheets of the same type; or it can be constructed by laminating multiple sheets of the same type in combination; and is not particularly limited.

[0041] The method for preparing the mask body (2) by laminating multiple sheet-like materials can be appropriately selected and is not limited to this method, but for example, 1. A method of simply overlapping multiple sheet-like materials without integrating them into a single unit. 2. A method of entangling a laminate formed by stacking multiple sheet-like materials by subjecting it to, for example, a needle punching device or a water flow entanglement device. 3. A method of melting and integrating the constituent components of a laminate formed by overlapping multiple sheet-like materials by subjecting it to a heating means. 4. A method of bonding and integrating sheet-like materials by interposing an adhesive such as a binder or hot melt resin between them. 5. A method of fusing and integrating a laminate formed by overlapping multiple sheet-like materials by applying sewing, adhesive, or point sealing treatment using ultrasonic fusion to the edges. These can be used.

[0042] The mask body (2) is made of, for example, polyolefin resins (polyethylene, polypropylene, polymethylpentene, polyolefin resins with a structure in which part of the hydrocarbon is replaced with a cyano group or a halogen such as fluorine or chlorine), styrene resins, polyether resins (polyetherether ketone, polyacetal, phenolic resin, melamine resin, urea resin, epoxy resin, modified polyphenylene ether, aromatic polyether ketone, etc.), polyester resins (polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, polycarbonate, polyarylate, fully aromatic polyester resin, unsaturated polyester resin, etc.). It can be constructed using known organic polymers such as polyimide resins, polyamide-imide resins, polyamide resins (e.g., aromatic polyamide resins, aromatic polyetheramide resins, nylon resins, etc.), resins having nitrile groups (e.g., polyacrylonitrile), urethane resins, epoxy resins, polysulfone resins (e.g., polysulfone, polyethersulfone, etc.), fluorine resins (e.g., polytetrafluoroethylene, polyvinylidene fluoride, etc.), cellulose resins, polybenzimidazole resins, and acrylic resins (e.g., polyacrylonitrile resins copolymerized with acrylic acid esters or methacrylic acid esters, modacrylic resins copolymerized with acrylonitrile and vinyl chloride or vinylidene chloride, etc.).

[0043] These organic polymers may consist of either linear or branched polymers, and may be block copolymers or random copolymers. Furthermore, there are no particular limitations on the three-dimensional structure or crystalline nature of the organic polymers. Moreover, they may be mixtures of multiple organic polymers, and there are no particular limitations on this.

[0044] If the mask body (2) includes a fabric, the fibers constituting the fabric can be obtained by known methods such as melt spinning, dry spinning, wet spinning, direct spinning (meltblown, spunbond, electrostatic spinning, etc.), a method of extracting fine fibers by removing one or more resin components from composite fibers, or a method of obtaining divided fibers by beating the fibers.

[0045] The fibers constituting the fabric may be composed of one or more types of resin components, and composite fibers, such as core-sheath type, sea-island type, side-by-side type, and orange type, which are generally referred to as composite fibers, can be used. Furthermore, composite fibers having a thermoplastic resin as one of the fiber components, which is a heat-bonding component, or latent crimpable composite fibers having multiple resins with different heat shrinkage rates can also be used.

[0046] The fiber diameter of the fibers constituting the fabric is not particularly limited, but it is preferably 0.01 μm to 1 mm, and more preferably 0.1 μm to 100 μm. The fiber length is also not particularly limited, but short fibers with a fiber length of 110 mm or less, long fibers with a fiber length exceeding 110 mm, or continuous fibers can be used.

[0047] If the aforementioned fabric is a woven or knitted fabric, the material can be prepared by weaving or knitting the fibers prepared as described above.

[0048] If the fabric is a nonwoven fabric, a dry method, a wet method, or the like can be used as a method for preparing a fiber web capable of producing a nonwoven fabric. Methods for entangling and / or integrating the fibers constituting the fiber web to form a nonwoven fabric include, for example, entangling with needles or a water stream, integrating the fibers with a binder, or, if the fiber web contains a thermoplastic resin, melting the thermoplastic resin by heat treatment to integrate the fibers.

[0049] Methods for heat-treating the fiber web include, for example, heating and pressurizing using a calender roll, heating using a hot air dryer, and irradiating with infrared rays under no pressure.

[0050] Alternatively, a direct spinning method may be used to reduce the diameter of the spinning solution or molten resin and directly spin it, while simultaneously collecting the fibers to prepare a nonwoven fabric.

[0051] If the mask body (2) includes a breathable foam or a breathable film, the material can be prepared by known methods, such as pouring molten resin into a mold and molding or foaming it.

[0052] Furthermore, in order to impart functionality to the mask (1) of the present invention, functional components may be included in the components constituting the mask (1), such as the mask body (2). The type of functional component is not limited, as it can be appropriately selected depending on the function required of the mask (1), but examples include radioactive material adsorbents (e.g., zeolite, activated carbon, Prussian blue, etc.), antibacterial agents and disinfectants, antiviral agents, antifungal agents, catalysts (e.g., titanium dioxide, manganese dioxide, or platinum-supported alumina, etc.), humidity control agents (e.g., silica gel, silica microcapsules, etc.), deodorizers such as activated carbon and carbon black, dyes, fragrances, cation exchange resins, and anion exchange resins.

[0053] Furthermore, the functional components may exist in particulate form on and / or inside the material, or in the form of a film that covers part or all of the surface of the material (for example, the surface of a fiber).

[0054] The method for supporting the functional components on the components constituting the mask (1), such as the mask body (2), can be appropriately selected. For example, one method can be employed in which a dispersion of functional components, or a dispersion of functional components containing a binder, is supported on one or both main surfaces of the material by spraying or using a known coating method (e.g., a kiss coating method using a gravure roll, a die coating method, etc.), and then the solvent is removed from the material. Alternatively, one method can be employed in which the material is immersed in the above-mentioned dispersion, lifted out, and then the solvent is removed from the material.

[0055] In order to improve the collection performance of the mask (1) of the present invention, it is preferable that the mask body (2) is charged.

[0056] As means for charging the mask charging portion (2), known means can be appropriately selected or combined, such as means of charging by implanting ions, such as plasma charging or corona charging; means of charging by applying force through a polar liquid; and means of charging by friction between multiple types of fiber components.

[0057] When using methods that involve ion implantation, such as plasma charging or corona charging, or when using methods that involve applying force through a polar liquid, the volume resistivity is 10 14 It is preferable to use an organic polymer with an electric charge of Ω·cm or more, as this allows for the creation of a material with a higher charge.

[0058] The volume resistivity is 10 14Examples of organic polymers with a resistivity of Ω·cm or higher include polyolefin resins (e.g., polyethylene resins, polypropylene resins, polymethylpentene resins, polystyrene resins, etc.), polytetrafluoroethylene, polyvinylidene chloride, polyvinyl chloride, and polyurethane. In this invention, "volume resistivity" refers to the value obtained by measurement in accordance with JIS K6911 "General Test Methods for Thermosetting Plastics".

[0059] Furthermore, when using a method of charging by applying force through a polar liquid, in order to increase the amount of charge of the material, one or more compounds selected from, for example, hindered amine compounds, aliphatic metal salts (e.g., magnesium salt of stearate, aluminum salt of stearate, etc.) and unsaturated carboxylic acid-modified polymers can be added as additives to the organic polymer constituting the material. Among these series of additives, the addition of hindered amine compounds is preferred.

[0060] Specific examples of such hindered amine compounds include, for example, poly[{(6-(1,1,3,3-tetramethylbutyl)imino-1,3,5-triazine-2,4-diyl){(2,2,6,6-tetramethyl-4-piperidyl)imino}hexamethylene{(2,2,6,6-tetramethyl-4-piperidyl)imino}}, dimethyl-1-(2-hydroxyethyl)-4-hydroxy-2,2,6,6-tetramethylpiperidine polycondensate, and bis(1,2,2,6,6-pentamethyl-4-piperidyl) 2-(3,5-di-t-butyl-4-hydroxybenzyl)-2-n-butylmalonate.

[0061] While there are no particular limitations on the amount of these additives added to the organic polymer, it is desirable that they be added in an amount of 0.01 to 5% by mass relative to the mass of the organic polymer. If the amount of additive added is less than 0.01% by mass, the electrostatic effect exhibited by the material tends to be small, so it is preferable to add 0.05% by mass or more. Furthermore, if the amount of additive exceeds 5% by mass, the strength of the material tends to be inferior. For this reason, it is more preferable to add 4% by mass or less.

[0062] In the present invention, the method of charging by applying force through a polar liquid refers to a method of charging a material by applying force through the polar liquid simultaneously with or after applying the polar liquid to the material.

[0063] Means for applying a polar liquid to a material include, for example, applying the polar liquid in the form of a mist, droplets, or flow using a spray, shower, or nozzle, or applying it by immersing the material in a polar liquid using an impregnation device (for example, Rodney Hunt's saturator). The means for applying the polar liquid to the material are not limited as long as a charged material can be obtained, and it is preferable to select them as appropriate.

[0064] As a polar liquid, it is preferable to use a liquid with low electrical conductivity, such as water, alcohol, acetone, aqueous alcohol solution, aqueous acetone solution, or aqueous ammonia solution. The electrical conductivity referred to here is that measured according to JIS K0101 "Test Method for Industrial Water". In particular, using water as the polar liquid is preferable because it provides a superior working environment when charging the material and can avoid ignition or combustion during the drying process described later.

[0065] Furthermore, while the temperature of the polar liquid used in the liquid charging process is not limited as long as it can charge the material, it is preferably 40°C or lower.

[0066] Methods for applying force to a material via a polar liquid include, for example, applying ultrasound, applying vibration, or removing the polar liquid from the material by suction. Alternatively, force may be applied to the material via the polar liquid by bringing the polar liquid into contact with the material using the means described above for applying the polar liquid to the material.

[0067] The characteristics of the mask body (2), such as basis weight and thickness, are not particularly limited and should be adjusted as appropriate. The basis weight of the mask body (2) is 5 to 500 g / m². 2 Preferably, it is 10-400g / m 2 It is more preferable that it be 20-300 g / m² 2 It is most preferable that the mask body (2) has a thickness of 0.1 to 30 mm, more preferably 0.2 to 25 mm, and most preferably 0.3 to 20 mm.

[0068] In this invention, "basis area" refers to the area of ​​the main surface in 1 m². 2 This refers to the mass per unit area. Furthermore, in this invention, "thickness of the mask body" specifically refers to the thickness value in the aforementioned region when a load of 1.96 kPa is applied to the main surface of the object to be measured. This thickness can be measured in the same way as when measuring the thickness of the cushioning material, for example, using a high-precision digital measuring instrument (Mitutoyo Corporation, Lightmatic®). In addition, if it is difficult to measure the thickness of the mask body as is, such as with a cup-shaped mask, the mask body may be disassembled, flat components of the mask body that can be measured for thickness may be cut out from the disassembled parts, and the thickness of these components may be measured with the mask body stacked in the same way as the mask body, and this value may be considered the "thickness of the mask body".

[0069] The dimensions of the mask body (2) in the left-right direction are not particularly limited as long as it can be fitted to the wearer's face, but are preferably 8.0 to 19.0 cm, more preferably 10.0 to 17.0 cm, and even more preferably 12.0 to 15.0 cm. Similarly, the dimensions of the mask body (2) in the up-down direction are not particularly limited as long as it can be fitted to the wearer's face, but are preferably 6.0 to 17.0 cm, more preferably 10.0 to 15.0 cm, and even more preferably 10.0 to 13.0 cm.

[0070] Known methods can be used to prepare the mask body (2). For example, the mask body material can be laminated and integrated by methods such as fusion bonding, and then a folded mask can be prepared by cutting or punching it out. Alternatively, the mask body material can be molded into a cup shape.

[0071] The mask body (2) may also be pleated. Any well-known technique can be used to pleat the mask body (2), and there are no particular limitations.

[0072] Furthermore, the mask body (2) may be equipped with shape-retaining members such as cup keepers to prevent the mask body (2) from deforming due to the wearer's breathing, a facet seal, an exhaust valve, and / or a pressing member to press the mask body toward the wearer's nose when the mask is worn.

[0073] The fastening strap (3) is a component that plays the role of securing the mask body (2) to the wearer's face. As long as it can perform this role, its shape can be appropriately selected and can be an elastic cord, a sheet-like component with an opening that can be hooked over the ears, or a long, thin tape-like component like a cord. Furthermore, the fastening strap (3) can be made from the same known organic polymer as the mask body (2). Moreover, it is preferable that the fastening strap (3) is elastic, as this makes it possible to realize a mask (1) that is easy to put on and can effectively secure the mask body (2) to the wearer's face. Components that can make up a fastening strap (3) that exhibits such effects can be an elastic cord or a long, thin tape-like component like an elastic cord. Furthermore, as a method of attaching the fastening strap to the mask body, ultrasonic welding or adhesive bonding can be used, but it is not particularly limited. [Examples]

[0074] The following describes the results of studies on embodiments and comparative examples of the present invention, but these are not intended to limit the scope of the present invention.

[0075] (Method for preparing the mask body) (i) Preparation of the mask filter layer The volume resistivity is 10 16 Using commercially available polypropylene resin with a density of approximately (Ω·cm), spinning is performed using the melt-blown method to produce melt-blown nonwoven fabric (basis weight: 50g / m²). 2 Fibers with an average diameter of 6 μm were prepared. The resulting meltblown nonwoven fabric was transported to a bath containing pure water (equivalent to secondary distilled water that has undergone distillation and ion exchange) maintained at a temperature of 20±5°C with an electrical conductivity of 3.2 (μS / cm) as a polar liquid. After adding the pure water, ultrasonic waves at a frequency of 20 kHz were applied. Subsequently, the ultrasonically treated meltblown nonwoven fabric was dried at 105°C using a conveyor-type dryer to obtain liquid-charged meltblown nonwoven fabric (basis weight: 50 g / m²). 2 Fibers with an average diameter of 6 μm were prepared. Next, the volume resistivity is 10 16Commercially available polypropylene fibers (fineness: 2.2 dtex, fiber length: 51 mm) and acrylic fibers (fineness: 2.2 dtex, fiber length: 51 mm) with a density of approximately (Ω·cm) were washed with 60°C hot water. The amount of fiber oil adhering to the fibers was adjusted to 0.1% or less of the fiber mass. Then, the fibers were uniformly mixed in a ratio of (polypropylene fibers:acrylic fibers = 40% by mass:60% by mass) and dried. This mixed fiber is formed into a fiber web using a carding device and subjected to frictional electrostatic charging, and this fiber web is then converted into a polypropylene spunbond nonwoven fabric (basis weight: 15g / m²). 2 After lamination, the fabric is subjected to needle punching from the fiber web side and then triboelectric treatment to create a needle-punched composite nonwoven fabric (basis weight: 120g / m²). 2 ) was prepared. Next, a cover layer with a basis weight of 20g / m² is applied. 2 We prepared spunbond nonwoven fabric (made of polypropylene). The prepared nonwoven fabrics were layered in the following order from top to bottom: spunbond nonwoven fabric (made of polypropylene) - meltblown nonwoven fabric - needle-punched composite nonwoven fabric with polypropylene spunbond nonwoven fabric on the lower side - needle-punched composite nonwoven fabric with polypropylene spunbond nonwoven fabric on the upper side - meltblown nonwoven fabric - spunbond nonwoven fabric (made of polypropylene), forming a laminated nonwoven fabric consisting of a total of six nonwoven fabrics. This laminated nonwoven fabric was ultrasonically cut into a sine wave shape, resulting in a roughly semicircular shape with a single convex section, while the layers of the nonwoven fabric were fused together at the cut section. Next, by unfolding the straight portion of the roughly semicircular laminated nonwoven fabric to the left and right, with the fusion line formed by the fusion bonding of the laminated nonwoven fabrics as the center, a cup-shaped filter layer was prepared in which spunbond nonwoven fabric (made of polypropylene), meltblown nonwoven fabric, and a needle-punched composite nonwoven fabric with polypropylene spunbond nonwoven fabric on the lower side were laminated in that order from the top layer to the bottom layer, and the nonwoven fabrics were fused together at the fusion line.

[0076] (ii) Preparation of mask reinforcement material By mixing fibers of the following composition and subjecting them to a carding machine, a basis weight of 40 g / m² is achieved. 2 The first reinforcing web was fabricated. • Polyethylene / polypropylene core-sheath type composite fiber (fineness: 6.6 dtex, fiber length: 102 mm): 70% by mass • Polyethylene terephthalate / polyethylene terephthalate copolymer side-by-side composite fiber (fineness: 2.2 dtex, fiber length: 51 mm): 25% by mass • Ethylene-ethylene vinyl acetate copolymer / polypropylene core-sheath type composite fiber (fineness: 3.3 dtex, fiber length: 64 mm): 5% by mass Next, by mixing fibers of the following composition and subjecting them to a carding machine, the basis weight is 40 g / m². 2 We fabricated the second reinforcing web. • Polyethylene / polypropylene core-sheath type composite fiber (fineness: 20 dtex, fiber length: 102 mm): 30% by mass • Polyethylene / polypropylene core-sheath type composite fiber (fineness: 6.6 dtex, fiber length: 102 mm): 65% by mass • Ethylene-ethylene vinyl acetate copolymer / polypropylene core-sheath type composite fiber (fineness: 3.3 dtex, fiber length: 64 mm): 5% by mass Then, the first reinforcing web and the second reinforcing web are laminated, and needle punching is performed from the first reinforcing web side, resulting in a needle-punched laminated nonwoven fabric (basis weight: 80g / m²). 2 ) was prepared. Two of the needle-punched laminated nonwoven fabrics prepared in this way were stacked and placed in an oven, where they were heated at 145°C for 5 minutes. After being removed from the oven, they were immediately pressed for 5 seconds using a mask mold to obtain a cup-shaped reinforcing material.

[0077] (iii) Preparation of the mask body The cup-shaped filter layer and cup-shaped reinforcing material, prepared as described above, were laminated so that the filter layer was located on the protruding side of the cup shape. Then, the entire outer circumference of both the filter layer and the reinforcing material was integrated with each other by ultrasonic welding to prepare the cup-shaped mask body. (Length in the vertical direction of the central part, which is the longest in the vertical direction: 13.0 cm; length in the vertical direction of the left and right ends, which are the shortest in the vertical direction: 7.0 cm; length in the horizontal direction: 14.5 cm)

[0078] (Preparing cushioning material) (i) Preparation of cushioning material A The apparent density is 58 kg / m³. 3 , The thickness when a pressure of 0.5 kPa is applied (hereinafter sometimes referred to as thickness) is 4.2 mm. The coefficient of dynamic friction measured by [Measurement Method] (hereinafter sometimes referred to as the coefficient of dynamic friction (load 100g)) was 0.86. The coefficient of dynamic friction measured by [Measurement Method 2] (hereinafter sometimes referred to as the coefficient of dynamic friction (load 300g)) was 0.76. The dynamic friction coefficient ratio, which is (dynamic friction coefficient measured by [Measurement Method 2]) / (dynamic friction coefficient measured by [Measurement Method]), is 0.88. The amount of air passing through the cushioning material (hereinafter sometimes referred to as air permeability) measured by the Frazier method specified in JIS L 1096:2010 8.26 Method A is 3.0 cm 3 / cm 2 / s A cushioning material A was prepared, consisting of polyurethane foam without a skin layer.

[0079] (ii) Preparation of cushioning material B The apparent density is 48 kg / m³. 3 , The thickness is 2.5 mm. The coefficient of kinetic friction (with a load of 100g) is 0.89. The coefficient of kinetic friction (with a load of 300g) is 1.19. The ratio of the coefficient of dynamic friction is 1.34. Air permeability: 4.3 cm 3 / cm 2 / s A cushioning material B was prepared, consisting of a polyurethane foam having a skin layer on one of its main surfaces.

[0080] (iii) Preparation of cushioning material C The apparent density is 48 kg / m³. 3 , The thickness is 5.0 mm. The coefficient of kinetic friction (with a load of 100g) is 1.74. The coefficient of kinetic friction (with a load of 300g) is 3.33. The ratio of the coefficient of kinetic friction is 1.91. Air permeability: 1.0 cm 3 / cm 2 / s A cushioning material C was prepared, consisting of a polyurethane foam having a skin layer on one of its main surfaces.

[0081] (iv) Preparation of cushioning material D Apparent density is 40 kg / m³ 3 , The thickness is 4.4 mm. The coefficient of kinetic friction (with a load of 100g) is 0.89. The coefficient of kinetic friction (with a load of 300g) is 1.04. The ratio of the coefficient of dynamic friction is 1.17. Air permeability: 26.4 cm 3 / cm 2 / s A cushioning material D was prepared, consisting of polyurethane foam without a skin layer.

[0082] (v) Preparation of cushioning material E The apparent density is 35 kg / m³. 3 , The thickness is 3.2 mm. The coefficient of kinetic friction (with a load of 100g) is 1.40. The coefficient of kinetic friction (with a load of 300g) is 1.31. The ratio of the coefficient of kinetic friction is 0.94. Air permeability: 56.0 cm 3 / cm 2 / s A cushioning material E was prepared, consisting of polyurethane foam without a skin layer.

[0083] (vi) Preparation of cushioning material F The apparent density is 45 kg / m³. 3 , The thickness is 3.0 mm. The coefficient of kinetic friction (with a load of 100g) is 0.55. The coefficient of kinetic friction (with a load of 300g) is 0.61. The ratio of the coefficient of kinetic friction is 1.11. Air permeability: 176.3 cm 3 / cm 2 / s A cushioning material F was prepared, consisting of polyurethane foam without a skin layer.

[0084] (vii) Preparation of cushioning material G The apparent density is 45 kg / m³. 3 , The thickness is 4.6 mm. The coefficient of kinetic friction (with a load of 100g) is 0.61. The coefficient of kinetic friction (with a load of 300g) is 0.57. The ratio of the coefficient of kinetic friction is 0.93. Air permeability: 69.2 cm 3 / cm 2 / s A cushioning material G was prepared, consisting of polyurethane foam without a skin layer.

[0085] (Example 1) First, cushioning material A was cut into a rectangle with a long side of 110 mm and a short side of 7.0 mm. Next, cushioning material A was attached to the wearer's side of the cup-shaped mask body using adhesive, so that the long side of cushioning material A extended in the left-right direction of the mask body, thereby joining the mask body and cushioning material A together. Finally, tie strings made of elastic cords with a length of 300 mm and a width of 4.0 mm were attached to both the left and right sides of the mask body using ultrasonic welding, and a mask as shown in Figure 1 was prepared.

[0086] (Example 2) A mask was prepared in the same manner as in Example 1, except that cushioning material B was used instead of cushioning material A, and the side without a skin layer was positioned in the direction that contacted the face.

[0087] (Example 3) A mask was prepared in the same manner as in Example 1, except that cushioning material C was used instead of cushioning material A, and the side without a skin layer was positioned in the direction that contacted the face.

[0088] (Example 4) A mask was prepared in the same manner as in Example 1, except that cushioning material D was used instead of cushioning material A.

[0089] (Example 5) A mask was prepared in the same manner as in Example 1, except that cushioning material E was used instead of cushioning material A.

[0090] (Comparative Example 1) A mask was prepared in the same manner as in Example 1, except that cushioning material F was used instead of cushioning material A.

[0091] (Comparative Example 2) A mask was prepared in the same manner as in Example 1, except that cushioning material G was used instead of cushioning material A.

[0092] The physical properties of the cushioning material used in the masks of the examples and comparative examples are shown in Table 1 below.

[0093] [Table 1]

[0094] The masks of the examples and comparative examples obtained as described above were evaluated by subjecting them to the following tests.

[0095] (Mask fit test) The shortened quantitative fit test described in JD.6.3.3, Fit Test Procedure, of Annex JD, Fit Test Procedure, of JIS T 8150:2021 "Selection, Use and Maintenance of Respiratory Protective Equipment," was performed. The fit test procedure followed the normal breathing exercise for 60 seconds and the procedure described in JD.6.3.3.4 Fit Test Procedure b) for disposable dust masks. The mask fit test measuring instrument used was the AccuFIT 9000 PRO MODEL 3000-J1 (manufactured by Nippon Kanomax Co., Ltd.). As an evaluation method, the fit factor was calculated using the following formulas when the subject performed normal breathing for 60 seconds and when they performed the four movements specified in the aforementioned shortened quantitative fit test (bending forward, vocalizing, left-right, and up-down). (Fit factor) = C out / C in C out : Particle concentration outside the mask C in : Particle concentration inside the mask For the overall evaluation, a "○" was given if the fit factor was 100 or higher when performing normal breathing for 60 seconds and in all four movements specified in the shortened quantitative fit test, while a "×" was given if the fit factor was less than 100 when performing normal breathing for 60 seconds and in at least one of the four movements specified in the shortened quantitative fit test.

[0096] Table 2 below shows the fit factors and overall evaluations for the masks used in the examples and comparative examples, including the fit factor during 60 seconds of normal breathing and the fit factor for each movement. Note that 60 seconds of normal breathing is labeled as "stopped" because no specific movement was performed.

[0097] [Table 2]

[0098] The fit test results showed that the mask described in the example, which has a high coefficient of dynamic friction of the cushioning material in the mask body, is less likely to shift when the face moves, and is less likely to allow harmful particles and pathogens to enter the inside of the mask. [Industrial applicability]

[0099] The mask of the present invention can be suitably used in masks such as dust masks and household masks. [Explanation of symbols]

[0100] 1: Mask 2: Mask body 3: Tie string 4: Cushioning material 5: Upper edge 6: Center of gravity

Claims

1. The mask has a main body that covers the user's mouth and nose, fastening strings attached to both the left and right sides of the main body, and a strip-shaped cushioning material made of foam. The cushioning material is provided extending in the left-right direction from the upper edge of the mask body on the wearer's side of the mask body, The amount of air passing through the thickness direction of the cushioning material, as measured by the Frazier method specified in JIS L 1096:2010 8.26 Method A, is 56 (cm³ / cm² / s) or less. The coefficient of dynamic friction of the surface of the cushioning material, as measured by the following [measurement method], is 0.86 or higher. mask. [Measurement method] (1) Cut the cushioning material constituting the mask into a rectangle measuring 1.5 cm x 8.0 cm to obtain a section. Then, attach adhesive tape to one main surface of the section to obtain a sample for measurement. Note that for foams having a skin layer formed by a film of resin on one main surface, attach the adhesive tape to the main surface of the foam having the skin layer. For foams having the skin layer on both main surfaces, or foams not having the skin layer, attach the adhesive tape to either one of the main surfaces of the foam. (2) Attach the side of the sample to be measured with adhesive tape to the sample stand (made of stainless steel) of the static friction measuring machine (manufactured by Trinity Lab Co., Ltd., model number: TL201Tt). (3) A tactile contact element attached to the static friction measuring machine (area: 2 cm²) ２ The tactile contactor is attached to the contact terminal of the static friction measuring machine such that the entire flat surface of the tactile contactor contacts the end of the long side of the measurement sample 1 cm inward. (4) A load of 100 g is applied to the contact terminal and the load is applied to the measurement sample, and the tactile contact is moved on the measurement sample to the other end of the long side of the measurement sample at a speed of 5 mm / sec. and a moving distance of 3 cm. The minimum value F of the kinetic friction force measured during this movement is １ｍｉｎ Record the value (in Newtons). (5) The minimum value F of the kinetic friction force obtained as described above. １ｍｉｎ By substituting this into the following equation, the coefficient of kinetic friction (μ) can be calculated. １ Calculate the value of '). Note that N (unit: N) represents the normal force, and in this measurement method, the normal force is 0.98 (N) because a load of 100g was applied to the contact terminal in (4). m １ '=F １ｍｉｎ / N

2. The mask according to claim 1, wherein the amount of air passing through the thickness direction of the cushioning material, as measured by the Frazier method specified in JIS L 1096:2010 8.26 A, is 30 (cm³ / cm² / s) or less.

3. The mask comprises a main body portion that covers the mouth and nose of the user, fastening strings attached to both the left and right sides of the main body portion, and a strip-shaped cushioning material made of foam, The cushioning material is provided extending in the left-right direction from the upper edge of the mask body on the wearer's side of the mask body, The coefficient of dynamic friction of the surface of the cushioning material, measured using the following [measurement method], is 0.86 or higher. The coefficient of dynamic friction of the surface of the cushioning material measured by the following [Measurement Method 2] is 0.76 or higher. mask. [Measurement method] (1) Cut the cushioning material constituting the mask into a rectangle measuring 1.5 cm x 8.0 cm to obtain a section. Then, attach adhesive tape to one main surface of the section to obtain a sample for measurement. Note that for foams having a skin layer formed by a film of resin on one main surface, attach the adhesive tape to the main surface of the foam having the skin layer. For foams having the skin layer on both main surfaces, or foams not having the skin layer, attach the adhesive tape to either one of the main surfaces of the foam. (2) Attach the side of the sample to be measured with adhesive tape to the sample stand (made of stainless steel) of the static friction measuring machine (manufactured by Trinity Lab Co., Ltd., model number: TL201Tt). (3) The tactile contact (area: 2 cm²) attached to the static friction measuring machine is attached to the contact terminal of the static friction measuring machine such that the entire flat surface of the tactile contact is in contact with the end of the long side of the sample to be measured, 1 cm inward. (4) A load of 100 g is applied to the contact terminal and the load is applied to the sample to be measured, and the tactile contact is moved on the sample to the other end of the long side of the sample at a speed of 5 mm / sec. and a moving distance of 3 cm. The minimum value of the kinetic friction force measured during this movement, F 1 min (unit: N), is recorded. (5) The value of the coefficient of kinetic friction (μ 1') is calculated by substituting the minimum value of the kinetic friction force F 1min obtained as described above into the following equation. Note that N (unit: N) represents the normal force, and in this measurement method, the normal force is 0.98 (N) because a load of 100g was applied to the contact terminal in (4). μ1'=F1min / N [Measurement method 2] (1) Cut the cushioning material constituting the mask into a rectangle measuring 1.5 cm x 8.0 cm to obtain a section. Then, attach adhesive tape to one main surface of the section to obtain a sample for measurement. Note that for foams having a skin layer formed by a film of resin on one main surface, attach the adhesive tape to the main surface of the foam having the skin layer, and for foams having the skin layer on both main surfaces, attach the adhesive tape to either one of the main surfaces of the foam. (2) Attach the side of the sample to be measured with adhesive tape to the sample stand (made of stainless steel) of the static friction measuring machine (manufactured by Trinity Lab Co., Ltd., model number: TL201Tt). (3) A tactile contact element attached to the static friction measuring machine (area: 2 cm²) ２ The tactile contactor is attached to the contact terminal of the static friction measuring machine such that the entire flat surface of the tactile contactor contacts the end of the long side of the measurement sample 1 cm inward. (4) A load of 300 g is applied to the contact terminal and the load is applied to the sample to be measured, and the tactile contact is moved on the sample to the other end of the long side of the sample at a speed of 5 mm / sec. and a moving distance of 3 cm. The minimum value F of the kinetic friction force measured during this movement is ２ｍｉｎ Record the value (in Newtons). (5) the minimum value F of the kinetic friction force obtained as described above ２ｍｉｎ is substituted into the following formula to calculate the value of the kinetic friction coefficient (μ ２ '). Note that N (unit: N) represents the normal force, and in this measurement method, the normal force is 2.94 (N) because a load of 300g was applied to the contact terminal in (4). m ２ '=F ２ｍｉｎ / N

4. The mask according to any one of claims 1 to 3, wherein the foam is polyurethane foam.

5. The mask according to any one of claims 1 to 3, wherein the thickness of the cushioning material when a pressure of 0.5 kPa is applied is 2.0 mm or more.

6. The amount of air passing through the thickness direction of the cushioning material, as measured by the Frazier method specified in JIS L 1096:2010 8.26 Method A, was 56 cm. ３ / cm ２ / s) is less than or equal to The mask according to claim 3.

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