JP7113863B2 - mask - Google Patents

Description

The present invention relates to disposable masks.

Disposable masks made by laminating a plurality of nonwoven fabrics are widely used for purposes such as measures against viruses, pollen, and fine particulate matter.
In recent years, such masks have come to be worn for a long period of time in response to heightened awareness of hygiene and beauty. The problem is the discomfort caused by

As a mask for coping with such a problem, Patent Document 1 discloses a mask including a mask main body and ear hooks provided on both left and right sides of the mask main body, wherein the mask main body comprises: It consists of at least two nonwoven fabric layers, a mouth layer in contact with the wearer's face and a filter layer laminated on the mouth layer, and the mouth layer has a moisture transpiration rate of 40% or more and a moisture diffusion area. A mask made of nonwoven fabric having a water absorption per area of 80 μg/mm ² or more has been proposed.
The mask of Patent Document 1 is said to be able to reduce discomfort due to stuffiness inside the mask and stickiness of the skin while exhibiting high particle collection efficiency.

JP 2017-166099 A

In the mask of Patent Document 1, the nonwoven fabric forming the mouth layer absorbs moisture contained in sweat and exhalation, thereby reducing contact of water droplets with the wearer's skin. Since the absorbed moisture is retained as it is, the wearer may feel wet, resulting in discomfort.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a mask that is less likely to cause the wearer to feel wet.

One aspect (aspect 1) of the present invention is a mask in which a skin-side sheet made of a hydrophilic nonwoven fabric and a filter sheet made of a nonwoven fabric are laminated,
The average deviation of the surface roughness of the non-skin side of the skin-side sheet is 3.30 μm or less, and the inter-fiber distance of the constituent fibers of the skin-side sheet is larger than the inter-fiber distance of the constituent fibers of the filter sheet. The mask is characterized by:

The mask of this aspect can absorb moisture contained in sweat and exhalation by the hydrophilic nonwoven fabric forming the skin-side sheet, so that contact of water droplets with the wearer's skin can be reduced. Furthermore, in the mask of this aspect, since the average deviation of the surface roughness of the non-skin side of the skin-side sheet is 3.30 μm or less, a gap is less likely to be formed between the skin-side sheet and the filter sheet, and both sheets are kept in close contact. In addition, since the inter-fiber distance of the constituent fibers of the skin-side sheet is larger than the inter-fiber distance of the constituent fibers of the filter sheet, the moisture absorbed by the skin-side sheet is transferred to the non-skin side by capillary action. It can be quickly transferred to the filter sheet.
As described above, in the mask of this aspect, although the skin-side sheet easily absorbs moisture, it is difficult for the wearer to feel wet because it is difficult to retain moisture.

In another aspect (aspect 2) of the present invention, in the mask according to aspect 1, the fiber diameter of the constituent fibers of the skin-side sheet is 13 μm or less.

In the mask of this aspect, the fiber diameter of the constituent fibers of the skin-side sheet is small, and the skin-side sheet is more likely to adhere to the filter sheet. It can be transferred to the filter sheet on the side.

According to still another aspect (aspect 3) of the present invention, in the mask according to aspect 1 or 2, the nonwoven fabric forming the filter sheet is an electret-processed nonwoven fabric.

In the mask of this aspect, the filter sheet is made of electret-processed nonwoven fabric, and the adhesion between the filter sheet and the skin-side sheet is improved, so the moisture absorbed by the skin-side sheet is more quickly transferred to the non-skin-side filter sheet. can be transferred.

In still another aspect (aspect 4) of the present invention, in the mask according to any one of aspects 1 to 3, the non-skin side of the skin-side sheet is formed by a net surface of a hydrophilic nonwoven fabric forming the skin-side sheet. It is characterized by being

In the mask of this aspect, since the fiber density increases toward the non-skin side of the skin-side sheet, the moisture absorbed by the skin-side sheet can be more reliably transferred to the non-skin-side filter sheet. .

In still another aspect (aspect 5) of the present invention, in the mask according to any one of aspects 1 to 4, a non-skin side sheet made of a hydrophilic nonwoven fabric is laminated on the non-skin side of the filter sheet. Characterized by

In the mask of this aspect, the non-skin-side sheet can absorb moisture that has migrated to the filter sheet, so it is possible to more reliably prevent the wearer from feeling wet.

According to still another aspect (aspect 6) of the present invention, in the mask of aspect 5, the non-skin-side sheet has a fiber density lower than that of the skin-side sheet.

In the mask of this aspect, the fiber density of the non-skin side sheet is low, so that the passage of air due to exhalation or the like is improved, and transpiration can be enhanced.

In still another aspect (aspect 7) of the present invention, in the mask of aspect 5 or 6, the non-skin side of the non-skin side sheet is formed by a net surface of a hydrophilic nonwoven fabric forming the non-skin side sheet. It is characterized by

In the mask of this aspect, the non-skin side sheet is formed of a hydrophilic nonwoven fabric, so that it is easy to absorb moisture transferred to the filter sheet as described above, and the non-skin side of the non-skin side sheet is made of fibers. Since it is formed by a net surface with high density, the absorbed moisture is easily transferred to the non-skin side, and the evaporation of moisture can be performed more reliably.

According to still another aspect (aspect 8) of the present invention, the mask according to any one of aspects 1 to 7 is characterized in that the mask is a pleated mask having a plurality of folds.

In the mask of this aspect, since at least the skin-side sheet and the filter sheet are folded together at the plurality of folds and are in close contact, moisture absorbed by the skin-side sheet is more reliably transferred to the non-skin-side filter sheet. can be transferred.

ADVANTAGE OF THE INVENTION According to this invention, the mask which does not easily give a wet feeling to a wearer can be provided.

FIG. 1 is a plan view of a disposable mask 1 according to one embodiment of the invention. FIG. 2 is a cross-sectional end view of the mask 1 in FIG. 1 taken along line II--II. FIG. 3 is an enlarged cross-sectional view of a nonwoven fabric laminate forming the mask main body 2 of the mask 1. As shown in FIG.

Preferred embodiments of the mask of the present invention will be described in detail below with reference to the drawings.

Various directions and the like used in this specification are as follows unless otherwise specified.
In this specification, the “vertical direction” is the direction corresponding to the vertical direction when the mask is worn, and the “lateral direction” is the direction corresponding to the horizontal direction when the mask is worn. They are in an orthogonal relationship. For example, in the case of a pleated or flat mask, the longitudinal direction corresponds to the horizontal direction and the width direction corresponds to the vertical direction of a substantially rectangular mask main body having longitudinal and width directions.
In addition, in this specification, unless otherwise specified, in the thickness direction of the mask, "relatively proximal to the wearer's skin surface when wearing the mask" is referred to as "skin side". When the mask is worn, the "distal side relative to the wearer's skin surface" is referred to as the "non-skin side." In this regard, the “skin-side surface” and “non-skin-side surface” of the mask and various members that make up the mask (for example, the skin-side sheet, the filter sheet, the non-skin-side sheet, etc.) are simply These are referred to as "skin side" and "non-skin side".

[mask]
FIG. 1 is a plan view of a disposable mask 1 according to one embodiment of the present invention, FIG. 2 is a cross-sectional end view of the mask 1 along line II-II in FIG. 1, and FIG. FIG. 2 is an enlarged cross-sectional view of a nonwoven fabric laminate forming a mask main body 2 of the mask 1;
As shown in FIG. 1, a disposable mask 1 according to one embodiment of the present invention includes a mask main body 2 having a substantially rectangular shape that covers the wearer's nose and mouth when worn, and a mask main body 2 that covers the wearer's nose and mouth. It is composed of a pair of ear hooking portions 3 which are connected to both sides in the horizontal direction H and have an annular shape that hangs over the ears of the wearer when worn.

Furthermore, as shown in FIG. 3, the mask body 2 of the mask ₁ includes a skin-side sheet 21 made of a hydrophilic nonwoven fabric positioned on the skin side T1 in the thickness direction T, and a non-skin side of the skin-side sheet 21. It is formed by a nonwoven fabric laminate in which a filter sheet 22 made of nonwoven fabric located at T2 and a non _- skin side sheet 23 made of hydrophilic nonwoven fabric located on the non _- skin side T2 of the filter sheet 22 are laminated. 1 and 2, the mask body 2 is arranged along the lateral direction H at the upper end of the mask body 2 so as to fit the shape of the wearer's upper nose. and a plurality of folds 4 formed by folding the nonwoven fabric laminate in the vertical direction V. As shown in FIG.

In the mask 1 of the present embodiment, the average deviation of the surface roughness of the non-skin side of the skin-side sheet 21 is 3.30 μm or less, and the inter-fiber distance of the constituent fibers of the skin-side sheet 21 is the same as that of the filter sheet. It is larger than the inter-fiber distance of 22 constituent fibers.

Here, the surface roughness average deviation (SMD) is a characteristic value of KES manufactured by Kato Tech Co., Ltd., which is generally known as a characteristic value representing the feel of the surface of the sheet (Reference: Standardization of texture evaluation and analysis (2nd edition), author Toshio Kawabata, published July 10, 1980).
Specifically, the surface roughness mean deviation (SMD) can be measured as follows.

<Measurement method of surface roughness mean deviation (SMD)>
Cut out a square sample piece of 100 mm long × 100 mm wide from an arbitrary point of the sheet (nonwoven fabric) to be measured, set it in a surface tester KES-FB-4A manufactured by Kato Tech Co., Ltd., and apply a predetermined load ( Measure the surface roughness average deviation: SMD (μm) by sliding a friction terminal to which a force of 25 gf, etc., is applied over the sample piece at a predetermined speed (e.g., 1.0 mm/sec, etc.) be able to. The average deviation (SMD) of surface roughness is obtained as the average value of the SMD value in the MD direction and the SMD value in the CD direction (that is, (SMD value in the MD direction+SMD value in the CD direction)/2).
The surface roughness mean deviation (SMD) is measured under an environment of room temperature of 20° C. and humidity of 60%, and the average value of the values measured at arbitrary five points on the sample piece is adopted.

In addition, the inter-fiber distance of each constituent fiber of the skin-side sheet 21 and the filter sheet 22, that is, the inter-fiber distance of the nonwoven fabric can be obtained as follows.

<Method for measuring distance between fibers>
A square sample piece of 5 cm square is cut out from an arbitrary point of the sheet (nonwoven fabric) to be measured, and the microscope (VHX-2000 manufactured by KEYENCE, lens VH-Z20W aperture open) Using the 3D image connection function of this sample. After obtaining a 200-fold magnified image that is in focus from the surface of the piece to a depth of 100 μm, extract the outside of the fiber that is in focus based on the magnified image, and the surface formed there As the fiber space, the area occupied by the fiber space is determined using the area measurement function of the microscope. At this time, an observation target portion of the sample piece is arbitrarily selected, and the area of the fiber space in the selected range is measured at 100 locations. From the area A [fiber space area (average value)] per fiber space in the selected range, the fiber space diameter (r) is obtained by the following formula (1), and the fiber space diameter (r) is the interfiber distance. (μm).
(r)=2×(A/π) ^1/2 (1)

As described above, the mask 1 of the present embodiment can absorb moisture contained in sweat and exhalation by the hydrophilic nonwoven fabric forming the skin-side sheet 21, so that contact of water droplets with the wearer's skin can be reduced. can. Furthermore, in the mask 1, since the average deviation of the surface roughness of the non-skin side of the skin-side sheet 21 is 3.30 μm or less, a gap is less likely to be formed between the skin-side sheet 21 and the filter sheet 22. Since the fibers can be brought into close contact with each other and the distance between the fibers constituting the skin-side sheet 21 is larger than the distance between the fibers constituting the filter sheet 22, moisture absorbed by the skin-side sheet 21 is absorbed by capillary action. It can be quickly transferred to the filter sheet 22 on the non _- skin side T2.
As described above, in the mask 1 of the present embodiment, although the skin-side sheet 21 easily absorbs moisture, it is difficult to retain moisture, so that it is difficult for the wearer to feel wet. can.

Various members constituting the mask of the present invention will be described in more detail below using the mask 1 of the above-described embodiment.

[Mask body]
In the mask 1 described above, the mask main body 2 that covers the wearer's nose and mouth when worn has a substantially rectangular shape in plan view, as shown in FIG. The shape of the mask main body 2 is not particularly limited as long as it can cover the nose and mouth of the wearer, and any shape such as a rectangular shape, an oval shape, a triangular shape, and a polygonal shape can be adopted. be able to.

Furthermore, as shown in FIG. 3, the mask main body 2 includes a skin-side sheet 21 made of a hydrophilic nonwoven fabric positioned on the skin _side T1 in the thickness direction T, and a non-skin side T2 of the skin _- side sheet 21. It is formed of a non-woven fabric laminate in which a filter sheet 22 made of non-woven fabric positioned on the filter sheet 22 and a non-skin side sheet 23 made of hydrophilic non-woven fabric positioned on the non _- skin side T2 of the filter sheet 22 are laminated. The skin-side sheet 21, the filter sheet 22, and the non-skin-side sheet 23 are fused together by a plurality of joints arranged at both ends in the vertical direction V and both ends in the horizontal direction H of the mask main body 2. It is

In the present invention, the nonwoven fabric laminate forming the mask main body is not particularly limited as long as at least two nonwoven fabrics, a skin side sheet made of a hydrophilic nonwoven fabric and a filter sheet made of a nonwoven fabric, are laminated, In addition to the three-layer nonwoven fabric laminate as in the above embodiment, for example, even a two-layer nonwoven fabric laminate in which a skin-side sheet and a filter sheet are laminated, the skin-side sheet, the filter sheet, and the non-skin A laminate of four or more layers of nonwoven fabric, in which, in addition to the side sheets, one or more optional nonwoven fabric sheets (for example, an intermediate sheet disposed between the filter sheet and the non-skin side sheet) are further laminated. may be

In the mask 1 described above, the mask main body 2 is positioned at the upper end of the mask main body 2, as shown in FIGS. and a plurality of folds 4 formed by folding the above-described nonwoven fabric laminate in the vertical direction V, but these are not essential constituents of the mask of the present invention. The body portion may not include such a nose fit portion and multiple folds.

Various sheets forming the mask main body 2 will be described in detail below.

(skin side sheet)
In the mask 1 described above, the skin-side sheet 21 is arranged on the skin _- side T1 of the mask main body 2, and is made of a hydrophilic nonwoven fabric capable of absorbing moisture contained in the wearer's sweat and exhalation. Since the skin-side sheet 21 is made of a hydrophilic nonwoven fabric, the mask 1 can reduce contact of water droplets with the wearer's skin.

The average deviation of the surface roughness of the non-skin side of the skin-side sheet 21 is 3.30 μm or less, and the inter-fiber distance of the constituent fibers of the skin-side sheet 21 is equal to the inter-fiber distance of the constituent fibers of the filter sheet 22 formed larger than Since the average deviation of the surface roughness of the non-skin side of the skin-side sheet 21 is 3.30 μm or less, a gap is less likely to be formed between the skin-side sheet 21 and the filter sheet 22, and the two sheets can be closely attached. can be contacted. Furthermore, since the inter-fiber distance of the constituent fibers of the skin-side sheet 21 is larger than the inter-fiber distance of the constituent fibers of the filter sheet 22, the moisture absorbed by the skin-side sheet 21 is transferred to the filter on the non _- skin side T2 by capillary action. A quick transition to the seat 22 is possible.

The hydrophilic nonwoven fabric forming the skin-side sheet 21 is not particularly limited except for the average deviation of surface roughness and the interfiber distance of the constituent fibers described above, and any hydrophilic nonwoven fabric can be used. Examples of such hydrophilic nonwoven fabrics include spunlace nonwoven fabrics, air-through nonwoven fabrics, spunbond nonwoven fabrics, airlaid nonwoven fabrics, meltblown nonwoven fabrics, flash spun nonwoven fabrics, thermal bond nonwoven fabrics, card nonwoven fabrics, and nonwoven fabrics made of hydrophilic fibers or subjected to hydrophilic treatment. nonwoven fabrics, and nonwoven fabrics obtained by arbitrarily combining these nonwoven fabrics (for example, SMS nonwoven fabrics), etc., but spunbond nonwoven fabrics are preferred in terms of strength, processability, and the like.

Also, the fibers constituting the nonwoven fabric are not particularly limited as long as they do not inhibit the effects of the present invention, and examples thereof include cellulose fibers and synthetic fibers.
Examples of cellulosic fibers include natural cellulosic fibers such as pulp, cotton and hemp; regenerated cellulosic fibers such as rayon, lyocell and cupra; Also, two or more types of fibers may be used in combination.
The synthetic fibers include polyolefin fibers such as polyethylene (PE) and polypropylene (PP); polyester fibers such as polyethylene terephthalate (PET) and polytrimethylene terephthalate (PTT); polyvinyl alcohol fibers such as vinylon; Polyacrylic fibers such as acrylonitrile; polyurethane (PU) fibers; polyamide fibers such as nylon; may Furthermore, the form of the synthetic fiber is not particularly limited, and examples include PP (core)/PE (sheath), high melting point PP (core)/low melting point PP (sheath), PET (core)/PE ( Synthetic fibers of any form can be used, such as core-sheath type conjugate fibers such as sheath portion); side-by-side type conjugate fibers; and modified cross-section type fibers such as flat, Y-shaped, and C-shaped.
When the nonwoven fabric is made of hydrophobic synthetic fibers, the synthetic fibers before forming the nonwoven fabric are treated with a hydrophilizing agent or the like, or the nonwoven fabric after formation is treated with a hydrophilizing agent or the like. Hydrophilization treatment may be performed by

Further, in the present invention, it is preferable that the constituent fibers of the skin-side sheet have a fiber diameter of 13 μm or less. In this way, if the fiber diameter of the constituent fibers of the skin-side sheet is small and the skin-side sheet easily adheres to the filter sheet, the moisture absorbed by the skin-side sheet can be more reliably absorbed by the non-skin-side filter. It can be transferred to a seat.

In addition, the fiber diameter of the constituent fibers of the nonwoven fabric can be measured by magnifying and observing the fibers using a scanning electron microscope. Specifically, it can be measured as follows.

<Method for measuring fiber diameter>
(1) Cut out 10 square sample pieces of 5 mm long×5 mm wide from an arbitrary portion of the sheet (nonwoven fabric) to be measured.
(2) The surface of the cut sample piece is observed with a scanning electron microscope (VE-7800 manufactured by KEYENCE) to obtain an enlarged image of the surface of the sample piece at a magnification of 500 times. One enlarged image is obtained for each sample piece, and a total of 10 images are obtained.
(3) Measure the fiber diameter of a predetermined number (for example, 10) of fibers on the outermost surface of each enlarged image.
(4) The fiber diameter (average fiber diameter; μm) is obtained by adding up the measured fiber diameters of each fiber and dividing by the number of fibers measured.

Moreover, in the present invention, it is preferable that the non-skin side of the skin-side sheet is formed by the net surface of the hydrophilic nonwoven fabric forming the skin-side sheet. When the non-skin side of the skin-side sheet is formed by the net surface in this way, the fiber density of the skin-side sheet increases toward the non-skin side, so the moisture absorbed by the skin-side sheet is more reliably absorbed by the non-skin side. It can be transferred to the filter sheet on the side.

The net surface of the nonwoven fabric is the surface that was in contact with the support (net) of the conveying facility when the nonwoven fabric was manufactured. The fiber density of the constituent fibers is relatively high, and it is specified as a substantially uniform surface with few irregularities.

The thickness, basis weight, and the like of the skin-side sheet are not particularly limited as long as they do not inhibit the effects of the present invention, and any thickness, basis weight, or the like can be employed. The basis weight is preferably in the range of 10 g/m ² to 100 g/m ² , more preferably in the range of 15 g/m ² to 80 g/m ² in terms of ease of distance adjustment, strength and flexibility. A basis weight within is more preferred.
The basis weight can be measured as follows.

<Method for measuring basis weight>
Ten square sample pieces of 2 cm long×2 cm wide are cut out from an arbitrary portion of the sheet (nonwoven fabric) to be measured, and the mass (g) of each sample piece is measured with an electronic balance. Next, the basis weight (g/m ² ) of the sample piece is calculated by dividing the measured mass (g) by the area (m ² ) of the sample piece. For the basis weight, the average value of 10 sample pieces is adopted.

(filter sheet)
In the mask 1 described above, the filter sheet 22 is positioned on the non-skin side T2 of the skin-side sheet 21 of the mask body ₂ and sandwiched between the skin-side sheet 21 and the non-skin-side sheet 23 . The filter sheet 22 filters out substances such as viruses, bacteria, dust, pollen, and microparticulate matter (e.g., PM2.5, etc.) that have passed through the non-skin side sheet 23 together with air (hereinafter simply referred to as "microparticles"). .) is formed by a non-woven fabric that can capture

The filter sheet 22 is formed such that the inter-fiber distance of the constituent fibers is smaller than the inter-fiber distance of the constituent fibers of the skin side sheet 21 . As a result, the filter sheet 22 can quickly absorb the moisture absorbed by the skin-side sheet 21 by capillary action while exhibiting excellent catching properties for the fine substances described above.

The nonwoven fabric forming the filter sheet 22 is not particularly limited except for the inter-fiber distance of the constituent fibers described above, and any nonwoven fabric can be used according to the desired capture properties. Examples of such nonwoven fabrics include the same hydrophilic nonwoven fabrics as the hydrophilic nonwoven fabrics forming the skin-side sheet described above, but the filter sheet is preferably a hydrophobic nonwoven fabric made of hydrophobic synthetic fibers. When the filter sheet is formed of such a hydrophobic nonwoven fabric, it can exhibit better transpiration. Polyolefin fibers such as PE and PP are preferably used as the hydrophobic synthetic fibers.

Moreover, in the present invention, the nonwoven fabric forming the filter sheet is preferably an electret-processed nonwoven fabric. When the filter sheet is formed of an electret-processed nonwoven fabric, it can exhibit excellent trapping properties for minute substances due to the force of static electricity, and the adhesion between the filter sheet and the skin-side sheet is further improved. Therefore, the moisture absorbed by the skin-side sheet can be transferred to the non-skin-side filter sheet more quickly.

The electret processing is a process of injecting charges into a dielectric nonwoven fabric by a method such as direct current corona discharge or high electric field. It is believed that the charge injected into the nonwoven fabric exists mainly near the surface of the constituent fibers of the nonwoven fabric. The amount of electric charge injected into the nonwoven fabric can be adjusted by the conditions of direct current corona discharge or application of a high electric field, but it can also be adjusted by the fiber diameter and fiber density of the constituent fibers of the nonwoven fabric.

The thickness, basis weight, and the like of the filter sheet are not particularly limited as long as they do not inhibit the effects of the present invention, and any thickness, basis weight, or the like can be employed. In addition, from the viewpoint of capturing properties for minute substances, the basis weight is preferably in the range of 15 g/m ² to 200 g/m ² , more preferably in the range of 12 g/m ² to 150 g/m ² . more preferred.

(non-skin side sheet)
In the mask 1 described above, the non-skin side sheet 23 is positioned on the non-skin side T 2 of the mask main body ₂ , more specifically, on the non-skin side T ₂ of the filter sheet 22, and is located on the skin side T ₁ of the filter sheet 22. It is formed of a hydrophilic non-woven fabric that can sandwich and hold the filter sheet 22 together with the skin-side sheet 21 located at .

The hydrophilic nonwoven fabric forming the non-skin-side sheet 23 is not particularly limited as long as it does not impair the effects of the present invention, and any nonwoven fabric can be employed according to desired strength, flexibility, and the like. Examples of such nonwoven fabrics include the same nonwoven fabrics as the hydrophilic nonwoven fabrics forming the skin-side sheet described above.

In the present invention, the non-skin side sheet is not limited to a hydrophilic nonwoven fabric, and can be formed of a hydrophobic nonwoven fabric similar to the filter sheet. is preferably formed. If the non-skin-side sheet located on the non-skin side of the filter sheet is formed of a hydrophilic non-woven fabric, the non-skin-side sheet can absorb moisture transferred to the filter sheet. It is possible to more reliably make it difficult to generate the sensation.

Moreover, in the present invention, the fiber density of the non-skin-side sheet is preferably lower than that of the skin-side sheet. If the fiber density of the non-skin side sheet is low, the passage of air by exhalation and the like can be improved, and transpiration can be enhanced.
The fiber density can be measured as follows.

<Method for measuring fiber density>
(1) The basis weight of each sample piece (that is, 10 sample pieces) cut out from the sheet (nonwoven fabric) to be measured is measured according to the above-described <Method for measuring basis weight>.
(2) The thickness of each sample piece used for measuring the basis weight was measured using a thickness gauge (manufactured by Daiei Kagaku Seiki Seisakusho Co., Ltd., model FS-60DS) equipped with a 15 cm ² probe. Measured under a measuring load of cm ² . As for the thickness of the sample piece, the thickness of the sample piece is measured at three arbitrary points, and the average value thereof is adopted.
(3) The fiber density (g/m ³ ) of each sample piece is obtained by dividing the basis weight of each sample piece measured in (1) above by the thickness of each sample piece measured in (2) above. Calculate For the fiber density, the average value of 10 sample pieces is adopted.

Moreover, in the present invention, it is preferable that the non-skin side of the non-skin side sheet is formed by the net surface of the hydrophilic nonwoven fabric forming the non-skin side sheet. As mentioned above, the non-skin side sheet is made of hydrophilic non-woven fabric, making it easier for the non-skin side sheet to absorb moisture transferred to the filter sheet, and the non-skin side of the non-skin side sheet has a fiber density If it is formed by a net surface with a high density, the absorbed water will easily move to the non-skin side, and the water will be able to evaporate more reliably.

The thickness, grammage, etc. of the non-skin side sheet are not particularly limited as long as they do not impede the effects of the present invention, and any thickness, grammage, etc. can be adopted. The basis weight is preferably in the range of 10 g/m ² to 100 g/m ² , more preferably in the range of 15 g/m ² to 80 g/m ² .

In the present invention, since it is not an essential constituent element for the mask to have a non-skin-side sheet, for example, the skin-side sheet and the filter sheet are firmly joined, and the filter sheet is sufficiently supported only by the skin-side sheet. If possible, the mask need not have a non-skin side sheet.

[Ear hook]
In the mask 1 described above, the pair of ear hooks 3, which hook the mask main body 2 to the wearer's nose and mouth by hooking on the wearer's ears when worn, has a flat cord shape and a round cord shape, as shown in FIG. It has an annular shape in which both ends of a shaped or belt-like elastic member are joined to both ends in the horizontal direction H of the mask main body 2 .

The elastic member that can be used as the ear hook portion 3 is not particularly limited as long as it can be hung on the wearer's ear to bring the mask body 2 into close contact with the wearer's nose and mouth. Examples include rubber and elastic nonwoven fabric. In addition, it is preferable that the stretchable member is less likely to be reduced in width even when stretched (that is, it is less likely to become wide). When the ear hook is formed of such a stretchable member that is less likely to be widened, the width of the ear hook is less likely to be narrowed when the ear hook is hung on the wearer's ear, and the ear hook is more likely to fit the wearer's ear. Since a large area can be secured for the part that contacts the ear, the wearer's ear is less likely to hurt.

The mask of the present invention has been described above using the disposable mask 1 as one embodiment, but the mask of the present invention is a so-called pleated mask having a plurality of folds 4 like the mask 1 described above. It is not limited, and can be applied to any mask such as a flat mask having a flat mask main body, or a three-dimensional mask having a three-dimensional structure such as a cup-shaped mask main body.
However, when the mask of the present invention is a pleated mask having a plurality of folds, at least the skin-side sheet and the filter sheet are folded together and adhered to each other at the plurality of folds, so that the skin-side sheet absorbs There is an advantage that the absorbed moisture can be transferred to the filter sheet on the non-skin side more reliably.

It should be noted that the mask of the present invention is not limited to the above-described embodiments and the like, and can be appropriately combined, substituted, changed, etc. without departing from the purpose and gist of the present invention.

1 disposable mask 2 mask main body 21 skin side sheet 22 filter sheet 23 non-skin side sheet 3 ear hook 4 folds

Claims (8)

A mask in which a skin-side sheet made of hydrophilic nonwoven fabric and a filter sheet made of nonwoven fabric are laminated,
The average deviation of the surface roughness of the non-skin side of the skin-side sheet is 3.30 μm or less, and the inter-fiber distance of the constituent fibers of the skin-side sheet is larger than the inter-fiber distance of the constituent fibers of the filter sheet. The mask, characterized in that: 2. The mask according to claim 1, wherein the fibers constituting the skin-side sheet have a fiber diameter of 13 [mu]m or less. 3. The mask according to claim 1, wherein the nonwoven fabric forming said filter sheet is an electret-processed nonwoven fabric. The mask according to any one of claims 1 to 3, wherein the non-skin side of the skin-side sheet is formed by a net surface of a hydrophilic nonwoven fabric forming the skin-side sheet. The mask according to any one of claims 1 to 4, characterized in that a non-skin side sheet made of a hydrophilic non-woven fabric is laminated on the non-skin side of the filter sheet. The mask according to claim 5, wherein the non-skin-side sheet has a fiber density lower than that of the skin-side sheet. 7. The mask according to claim 5, wherein the non-skin side of the non-skin side sheet is formed by a net surface of a hydrophilic nonwoven fabric forming the non-skin side sheet. The mask according to any one of claims 1 to 7, characterized in that said mask is a pleated mask having a plurality of folds.

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