JP2022124963A - mask - Google Patents

Abstract

To provide a mask which improves collection efficiency while ventilation resistance is suppressed and can reduce discomfort of a mask inner side and a burden on skin.SOLUTION: A disposable mask (1) includes: a mask body part (2); and a pair of ear hooks (3) extending from both sides of the mask body part (2) in a lateral direction (H). Collection efficiency of the mask body part (2) is 70% or more. A ventilation resistance value of the mask body part (2) is 24 Pa or less. A transpiration rate of the mask body part (2) is 65% or more.SELECTED DRAWING: Figure 1

Description

The present invention relates to disposable masks.

Disposable masks are widely used as a countermeasure against viruses, pollen, fine particulate matter, and the like. In recent years, such masks have come to be worn for long periods of time in response to heightened awareness of health and hygiene. Along with this, there is a problem of discomfort caused by contact with the skin of the wearer due to sweat and water droplets from exhalation inside the mask, burden on the skin, and even rough skin.

Japanese Patent Application Laid-Open No. 2002-200001 discloses a mask intended to reduce discomfort due to stuffiness inside the mask and stickiness of the skin. This mask is a mask comprising a mask main body and ear hooks provided on both left and right sides of the mask main body, wherein the mask main body includes a mouth layer in contact with the face of the wearer and the mouth. At least two non-woven fabric layers of the filter layer laminated on the layer, and the mouth layer has a moisture transpiration rate of 40% or more and a moisture absorption amount per area in the moisture diffusion region of 80 μg/mm ² or more. It is a mask made of nonwoven fabric. According to Patent Document 1, this mask 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

As can be understood from the fact that the mask of Patent Document 1 measures the collection efficiency using pollen substitute particles with a particle size of about 30 μm, the main collection target is relatively large particles such as pollen. . This mask is therefore intended to reduce discomfort inside the mask while maintaining a high collection efficiency for such relatively large particles. Therefore, prioritizing facilitating evaporation of moisture absorbed by the mouth layer to the outside air, the collection efficiency common to disposable masks, including droplets containing viruses and relatively small particles such as PM2.5 does not consider increasing the

However, if an attempt is made to improve the material of the mask in order to increase the general collection efficiency of even relatively small particles, the ventilation resistance of the mask tends to increase. In addition, it becomes difficult for the sweat and moisture contained in exhalation inside the mask to escape to the outside, and when worn for a long time, the wearer may feel discomfort and the burden on the skin may increase, and the wearer may experience rough skin. may occur. On the other hand, if you try to make it easier for the moisture inside the mask to escape to the outside while keeping the ventilation resistance of the mask low, it becomes difficult to collect relatively small particles, and general collection efficiency cannot be improved. It's not easy.

Furthermore, in the mask of Patent Document 1, the characteristics of only the mouth layer are defined. However, whether or not the discomfort of the mask can be reduced depends not only on the characteristics of the mouth layer, but also on the characteristics of the mask as a whole, and the characteristics of the mouth layer alone do not necessarily reduce the discomfort of the mask. In particular, since this mask mainly collects relatively large particles, it sacrifices the collection efficiency of the mask for relatively small particles to make it easier for moisture to escape, resulting in an undesirable overall mask. It is also conceivable that it may have reduced the pleasure.

Therefore, the present invention provides a mask that can reduce ventilation resistance, increase collection efficiency, and reduce discomfort inside the mask and burden on the skin (including rough skin) even when worn for a long time. With the goal.

One aspect (aspect 1) of the present invention is a disposable mask comprising a mask main body and a pair of ear hooks extending from both sides of the mask main body in the horizontal direction, wherein the mask main body has a cap. The mask has a collection efficiency of 70% or more, a ventilation resistance value of 24 Pa or less in the mask body, and a transpiration rate of 65% or more in the mask body.

Since the mask of this aspect has a transpiration rate of 65% or more in the mask main body, it is possible to transpire (release) water droplets due to sweat and exhalation inside the mask to the outside of the mask main body, even when worn for a long time. , it is possible to suppress the adhesion and accumulation of water droplets on the inside of the mask and on the wearer's skin. At the same time, in the mask main body, the general collection efficiency is 70% or more by the method of measuring collection efficiency and airflow resistance (using particles of 0.06 to 0.1 μmφ) used in the present invention, The ventilation resistance value is 24 Pa or less. Therefore, while having a high transpiration rate as described above, while maintaining a low ventilation resistance value, not only relatively large particles such as pollen and dust, but also droplets containing viruses and relatively large particles such as PM2.5 Even small particles can be collected with high efficiency. Therefore, it is possible to increase collection efficiency while suppressing ventilation resistance, and reduce discomfort inside the mask and burden on the skin (including rough skin) not only for short-term wearing but also for long-term wearing.

In another aspect (aspect 2) of the present invention, in the mask of aspect 1, the collection efficiency is 88% or more.

Since the mask of this aspect has a transpiration rate of 88% or more in the mask main body, it has a high transpiration rate and maintains a low ventilation resistance value, and not only relatively large particles but also relatively small particles , can be collected with higher efficiency.

In still another aspect (aspect 3) of the present invention, in the mask of aspect 1 or 2, the mask main body is composed of a plurality of sheets, and the plurality of sheets are positioned on the skin side and are hydrophilic. A skin-side sheet made of flexible nonwoven fabric or woven fabric.

The mask of this aspect has a mask main body made up of a plurality of sheets, and the plurality of sheets is provided with a skin-side sheet made of a hydrophilic non-woven fabric or woven fabric. Therefore, the hydrophilic nonwoven fabric or woven fabric that forms the skin-side sheet can easily absorb water contained in sweat or exhaled air, so that contact of water droplets with the wearer's skin can be reduced. As a result, it is possible to further reduce the discomfort inside the mask and the burden on the skin even when wearing it for a long time.

In still another aspect (aspect 4) of the present invention, in the mask of aspect 3, the average fiber diameter of the constituent fibers of the skin-side sheet is 13 μm or less.

In the mask of this embodiment, the average fiber diameter of the constituent fibers of the skin-side sheet is 13 μm or less, which is very fine, so the number of fibers per unit volume is relatively large. Therefore, the taken-in moisture can be quickly diffused over a wide area within the skin-side sheet. Thereby, it is possible to further reduce the contact of water droplets with the wearer's skin. In addition, since the fiber diameter of the constituent fibers of the skin-side sheet is small, the texture is fine and smooth to the touch, and the contact with delicate lips and skin can be improved. As a result, it is possible to further reduce the discomfort inside the mask and the burden on the skin even when wearing it for a long time.

In still another aspect (aspect 5) of the present invention, in the mask of aspect 3 or 4, the plurality of sheets further includes a filter sheet made of non-woven fabric laminated on the non-skin side of the skin-side sheet.

The mask of this aspect is formed of non-woven fabric, and a filter sheet with a relatively high fiber density is laminated on the non-skin side of a skin-side sheet with a relatively low fiber density. Therefore, the moisture taken in the hydrophilic skin-side sheet can be taken into the high fiber density filter sheet. As a result, the skin-side sheet can continuously take in water droplets, and it is possible to further reduce the discomfort inside the mask and the burden on the skin even when worn for a long time.

In yet another aspect (aspect 6) of the present invention, in the mask of aspect 5, the filter sheet is hydrophobic, and the plurality of sheets are hydrophilic, laminated on the non-skin side of the filter sheet. A non-skin-side sheet made of nonwoven fabric is further provided.

In the mask of this aspect, the filter sheet is made of a hydrophobic nonwoven fabric, and the non-skin side sheet is made of a hydrophilic nonwoven fabric. It can be made easy to be taken into the skin side sheet. Therefore, the skin-side sheet can continuously take in more water droplets, and it is possible to further reduce the discomfort inside the mask and the burden on the skin even when worn for a long time.

In still another aspect (aspect 7) of the present invention, in the mask of aspect 6, the hydrophilicity of the non-skin-side sheet is lower than the hydrophilicity of the skin-side sheet.

In the mask of this aspect, since the hydrophilicity of the non-skin-side sheet is relatively low, it is possible to make it difficult for the non-skin-side sheet to retain moisture that has migrated from the filter sheet to the non-skin-side sheet. can be released. Therefore, moisture can be continuously and efficiently discharged from the skin-side sheet to the outside through the filter sheet and the non-skin-side sheet. As a result, it is possible to further reduce the discomfort inside the mask and the burden on the skin even when wearing it for a long time.

In still another aspect (aspect 8) of the present invention, in the mask of aspect 6 or 7, the fiber density of the non-skin-side sheet is lower than the fiber density of the skin-side sheet.

In the mask of this aspect, the fiber density of the non-skin side sheet is relatively low, so air passage due to exhalation etc. release). As a result, it is possible to further reduce the discomfort inside the mask and the burden on the skin even when wearing it for a long time.

In still another aspect (aspect 9) of the present invention, in the mask according to any one of aspects 5 to 8, 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 an electret-processed nonwoven fabric, and the collection property is enhanced, and the adhesion between the filter sheet and the skin-side sheet is improved. Therefore, the collection efficiency can be increased, and the moisture taken in by the skin-side sheet can be transferred to the non-skin-side filter sheet more quickly. As a result, high collection efficiency can be obtained, and discomfort inside the mask and burden on the skin can be further reduced even when the mask is worn for a long time.

In still another aspect (aspect 10) of the present invention, in the mask according to any one of aspects 1 to 9, the mask is a pleated mask having a plurality of folds in the vertical direction of the mask main body. .

In the mask of this aspect, the plurality of folds are vertically opened to form a three-dimensional space in the central portion of the mask body. It is possible to reduce the contact of the skin side of the main body with the delicate lips and skin, and it is possible to further reduce the discomfort inside the mask and the burden on the skin even when worn for a long time.

ADVANTAGE OF THE INVENTION According to this invention, while suppressing airflow resistance, the collection efficiency can be improved and the mask which can reduce the discomfort inside a mask, and a burden on skin 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 view of the mask 1 in FIG. 1 along line II-II. FIG. 3 is an enlarged cross-sectional view of a main part showing the structure of 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 lateral direction and the lateral direction corresponds to the vertical direction of a substantially rectangular mask body having longitudinal and lateral 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 connection, the "skin-side surface" and "non-skin-side surface" of the mask and various sheet members that constitute the mask are simply referred to as "skin-side surface" and "non-skin-side surface", respectively.

[mask]
FIG. 1 is a plan view of a disposable mask 1 according to this embodiment, and FIG. 2 is a cross-sectional view of the mask 1 along line II-II in FIG. 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. and a pair of ear hooks 3 extending from both sides in the horizontal direction H.

The mask main body 2 of the mask 1 is composed of a single sheet member or a plurality of sheet members laminated in the thickness direction. In this embodiment, as shown in FIG. 1, the mask main body 2 is deformed to fit the shape of the wearer's upper nose, which is arranged along the lateral direction H at the upper end of the mask main body 2. A possible nose fit may be provided. Further, as shown in FIGS. 1 and 2, the mask 1 may be a pleated mask provided with a plurality of folds 4 formed by folding one or more sheet members of the mask main body 2 in the vertical direction V. good.

In the mask 1, the collection efficiency indicating the performance of collecting particles in the mask body 2 is 70% or more, and the ventilation resistance value (pressure loss) indicating the performance of the ventilation resistance of the mask body 2 is 24 Pa or less. Yes, and the transpiration rate indicating the performance of water transpiration of the mask main body 2 is 65% or more.

Here, the collection efficiency and airflow resistance value (pressure loss) are measured by the following methods.
<Collection efficiency and ventilation resistance>
The measurement environment is assumed to have a temperature of 20° C. and a humidity of 60%.
(1) A circular sample is cut out from an arbitrary location on the mask main body 2 to be measured. The sample includes a circular portion (measurement target area) with a diameter of 100 mm, and further includes an excess portion with a width of at least 5 mm or more around the circular portion. For example, a circular sample with a diameter of 120 mm. However, an embossed portion or a fused portion may exist in the surplus portion outside the circular portion (measurement target area) with a diameter of 100 mm, which is not the measurement target.
(2) In a mask performance tester AP-9000 type (manufactured by Shibata Scientific Co., Ltd.), a sample is attached to a jig dedicated to the tester (measurement range 100 mmφ).
(3) NaCl: In a space containing a gas (example: air) in which particles of 0.06 to 0.1 μmφ are adjusted to a concentration of 0.5 mg/m ³ , the gas is passed through the sample at a flow rate of 30 L/min. to measure the particle concentration and pressure of the gas before passing through the sample and the particle concentration and pressure of the gas after passing through.
(4) Based on these measured values, the collection efficiency for 1 minute is calculated from the difference in particle concentration, and the pressure loss, that is, the ventilation resistance value is calculated from the pressure difference. The collection efficiency is an index of collection performance, and the higher the collection efficiency, the higher the collection performance. The ventilation resistance value is an index of ventilation performance, and the lower the value, the higher the ventilation performance.
In the case of a small mask main body that cannot be cut out from a sample having a circular measurement target area of 100 mm in diameter, a sample having a circular measurement target area of 50 mm in diameter is cut out.

Also, the transpiration rate is measured by the following method.
<transpiration rate>
The measurement environment is assumed to have a temperature of 20° C. and a humidity of 60%.
(1) Five square samples of 5 cm on each side are cut out from arbitrary locations of the mask main body to be measured. If a single mask cannot be cut out, a total of five masks are cut out from a plurality of masks of the same type. Then, these five samples, a stainless steel container of 20 cm square or more used for measurement, a tape (width of 10 mm or more), and distilled water are stored in the above measurement environment for 24 hours.
(2) Measure the mass of a stainless steel container of 20 cm square or more, a sample, and a tape (for use).
(3) Drop 0.125 ml of distilled water into the container, and measure the mass of the container (including the distilled water) (mass A).
(4) The sample is placed on top of the distilled water in the container, and two opposite sides of the square sample are fixed to the container with a weighed tape. The tape is such that a 5 mm wide portion of the total width of the tape overlaps the edge of the sample.
(5) After 40 minutes, weigh the container (including at least tape and sample) (mass B).
(6) Based on the measured mass A and mass B, the transpiration rate is calculated by the following formula.
(Transpiration rate) = (1-B/A) x 100 (%)
The transpiration rate is an index of transpiration performance, and the higher the transpiration rate, the higher the transpiration performance.
The final transpiration rate is the average of the values obtained from the five samples.

In the mask 1 of this aspect, the transpiration rate of the mask body 2 measured by the above method is 65% or more, and the collection efficiency of the mask body 2 measured by the above method is 70% or more. The ventilation resistance value of the mask main body 2 measured by the above method is 24 Pa or less.

Thus, in the mask 1 of this aspect, since the transpiration rate of the mask main body 2 is 65% or more, water droplets due to sweat and exhalation on the inside (skin side) of the mask main body 2 are removed from the outside of the mask main body 2. It can evaporate (release) to (non-skin side), and even when worn for a long time, it is possible to suppress the adhesion and accumulation of water droplets on the inside of the mask 1 and on the wearer's skin. At the same time, in the mask main body 2, the general collection efficiency is 70% or more by the method of measuring the collection efficiency/ventilation resistance value (using particles of 0.06 to 0.1 μmφ) used in the present invention. and the ventilation resistance value (pressure loss) is 24 Pa or less. Therefore, while having a high transpiration rate as described above, while maintaining a low ventilation resistance value, not only relatively large particles such as pollen and dust, but also droplets containing viruses and relatively large particles such as PM2.5 Even small particles can be collected with high efficiency. Therefore, it is possible to increase the collection efficiency while suppressing the airflow resistance value, and reduce the discomfort inside the mask 1 and the burden on the skin and the occurrence of rough skin even when worn for a long time.

However, in the mask 1 of this aspect, it is preferable that the collection efficiency of the mask body 2 measured by the above method is 88% or more. In that case, the mask 1 can collect not only relatively large particles but also relatively small particles with a very high efficiency while maintaining a low airflow resistance value while having a high transpiration rate.

Moreover, in the mask 1 of this aspect, the transpiration rate of the mask main body 2 measured by the above method is preferably 70% or more. In that case, the mask 1 has a high collection performance, while maintaining a low ventilation resistance value, and transpires more water droplets due to sweat and exhalation inside the mask body 2 to the outside of the mask body 2 ( release).

Various members of the mask 1 according to this embodiment will be further described below.

[Mask body]
In this embodiment, as shown in FIG. 1, the mask main body 2 of the mask 1 has a substantially rectangular shape in plan view. The shape of the mask main body 2 is not particularly limited as long as it can cover the wearer's nose and mouth. can be adopted.

In this embodiment, the mask main body 2 is composed of a plurality of sheet members. FIG. 3 is an enlarged cross-sectional view of a main part showing the configuration of the mask main body 2 according to this embodiment. The mask main body 2 includes, in the thickness direction T, a skin-side sheet 21 located on the skin side T1, _a filter sheet 22 located on the non _- skin side T2 of the skin-side sheet 21, and a non-skin side of the filter sheet 22. A non-skin side sheet 23 positioned on the skin _side T2. The skin-side sheet 21 is made of a hydrophilic non-woven fabric or woven fabric, the filter sheet 22 is made of a non-woven fabric, preferably a hydrophobic non-woven fabric, and the non-skin-side sheet 23 is made of a non-woven fabric, preferably a hydrophilic non-woven fabric. The skin-side sheet 21, the filter sheet 22, and the non-skin-side sheet 23 are fused or adhered to each other 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

However, the configuration of the mask main body 2 is not limited to this example, and may be composed of two layers, the skin-side sheet 21 and the non-skin-side sheet 23, without the filter sheet 22. It may be composed of two layers, the skin-side sheet 21 and the filter sheet 22, without the side sheet 23, or it may be composed of only one layer of the skin-side sheet 21, the filter sheet 22, and the non-skin-side sheet 23. may Furthermore, in any of the above cases (including the case of FIG. 3), each sheet may be composed of a plurality of sheets, or another type of sheet (example: filter sheet 22 and An intermediate sheet arranged between the non-skin side sheet 23) may be arranged.

In this embodiment, the mask 1 is a pleated mask having a plurality of folds 4 in the vertical direction V of the mask main body 2 . Therefore, by opening the plurality of folds 4 in the vertical direction V, the central portion of the mask main body 2 can form a three-dimensional space. As a result, even if the mask main body 2 takes in water droplets due to sweat or exhalation, the surface of the mask main body 2 on the skin side can be reduced from coming into contact with delicate lips and skin, and even if worn for a long time, the inside of the mask can be prevented. It is possible to further reduce the discomfort and burden on the skin.

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

(skin side sheet)
In this embodiment, 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 or woven fabric that absorbs moisture contained in the wearer's sweat and exhalation. Therefore, the skin-side sheet 21 can easily absorb moisture contained in sweat or exhaled air by the hydrophilic nonwoven fabric or woven fabric. As a result, it is possible to reduce the contact of water droplets with the wearer's skin, and it is possible to further reduce the discomfort inside the mask 1 and the burden on the skin even when the mask is worn for a long time. The skin-side sheet 21 may be formed of a single layer, or may be formed of multiple layers.

When a hydrophilic nonwoven fabric is used as the skin-side sheet 21, any hydrophilic nonwoven fabric having desired properties can be used as long as the effects of the present invention are not impaired. Such hydrophilic nonwoven fabrics include, for example, spunlace nonwoven fabrics, air-through nonwoven fabrics, spunbond nonwoven fabrics, airlaid nonwoven fabrics, meltblown nonwoven fabrics, spunmelt nonwoven fabrics, and flash-spun nonwoven fabrics made of hydrophilic fibers or subjected to hydrophilic treatment. , thermal bond nonwoven fabric, carding nonwoven fabric, or a nonwoven fabric obtained by arbitrarily combining these nonwoven fabrics (example: SMS nonwoven fabric, etc.). Among them, a spunbond nonwoven fabric is preferable from the viewpoint of strength, workability, and the like.

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

In the present invention, the constituent fibers of the skin-side sheet 21 preferably have an average fiber diameter of 13 μm or less. In this case, since the average fiber diameter of the constituent fibers of the skin-side sheet 21 is very small, the number of fibers per unit volume is relatively large. Therefore, the taken-in moisture can be quickly diffused over a wide area within the skin-side sheet 21 . Thereby, it is possible to further reduce the contact of the moisture taken in the skin-side sheet 21 with the wearer's skin. In addition, since the fiber diameter of the constituent fibers of the skin-side sheet 21 is small, the texture is fine and smooth to the touch, and the contact with delicate lips and skin can be improved. As a result, even when worn for a long time, the discomfort inside the mask and the burden on the skin can be further reduced.

The average fiber diameter of the constituent fibers of the nonwoven fabric is measured by the following method.
<Average 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 (example: 10) of fibers on the outermost surface of each enlarged image.
(4) Add up the measured fiber diameters of each fiber and divide by the number of fibers measured to obtain the average fiber diameter (μm).

When a hydrophilic woven fabric is used for the skin-side sheet 21, any hydrophilic woven fabric having desired properties can be used as long as the effects of the present invention are not impaired. Examples of such hydrophilic woven fabrics include plain weave fabrics of natural fibers, and examples of natural fibers include cotton, silk, and hemp. A specific example of such a fabric is gauze made by plain weaving cotton. Cotton includes, for example, Hirszum cotton (example: Upland cotton), Barbadense cotton, Arboreum cotton, and Helvaceum cotton. Organic cotton or pre-organic cotton (trademark) may be used as cotton. However, organic cotton means cotton certified by GOTS (Global Organic Textile Standard).

In the present invention, when the skin-side sheet 21 is a non-woven fabric, it is preferable that the non-skin side of the skin-side sheet 21 is formed by the net surface of the non-woven fabric. When the non-skin side surface of the skin-side sheet 21 is formed by the net surface in this way, the fiber density of the skin-side sheet 21 increases toward the non-skin side surface, so the moisture absorbed by the skin-side sheet 21 from the skin side surface increases. can be reliably transferred to the non-skin side. As a result, when the non-skin side surface of the skin-side sheet 21 is exposed to the outside, the moisture can be easily evaporated to the outside. Alternatively, when a sheet member (example: filter sheet 22, non-skin side sheet 23) is laminated on the non-skin side of the skin side sheet 21, the moisture can be easily transferred to the sheet member.

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 the surface is substantially uniform with few irregularities.

When a non-woven fabric sheet member (example: filter sheet 22, non-skin side sheet 23) is laminated on the non-skin side of the skin side sheet 21, the inter-fiber distance of the constituent fibers of the skin side sheet 21 is the same as that of the sheet It is preferably formed to be larger than the inter-fiber distance of the constituent fibers of the member. As a result, the moisture taken in by the skin-side sheet 21 can be quickly transferred to the non-skin-side sheet member by capillary action.

The interfiber distance of the constituent fibers of the nonwoven fabric is measured by the following method.
<Distance between fibers>
(1) A 5 cm square square sample piece is cut out from an arbitrary portion of the sheet (nonwoven fabric) to be measured.
(2) Using the 3D image linking function of a microscope (VHX-2000 manufactured by KEYENCE, lens VH-Z20W aperture open), obtain a 200-fold enlarged image that is in focus from the surface of the sample piece to a depth of 100 μm.
(3) Based on the magnified image, the outside of the focused fiber is extracted, the surface formed there is taken as the fiber space, and 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.
(4) 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, and the fiber space diameter (r) is Let distance be (μm).
(r)=2×(A/π) ^1/2

The thickness, basis weight, and the like of the skin-side sheet 21 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 .

The basis weight of each sheet is measured by the following method.
<Basis weight>
(1) Cut out 10 square sample pieces of 2 cm long×2 cm wide from an arbitrary portion of a sheet (nonwoven fabric) to be measured.
(2) Measure the mass (g) of each sample piece with an electronic balance.
(3) Calculate the basis weight (g/m ² ) of the sample piece by dividing the measured mass (g) by the area (m ² ) of the sample piece.
(4) Calculate the average value of 10 sample pieces and use it as the basis weight of the sheet.

(filter sheet)
In this embodiment, 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 captures substances (hereinafter simply referred to as “micro substances”) such as droplets including viruses coming from the non-skin side, bacteria, dust, pollen, and fine particulate matter (example: PM2.5). It is formed by a non-woven fabric obtained from In addition, the filter sheet 22 may be formed of a single layer, or may be formed of multiple layers.

The filter sheet 22 is preferably formed such that the fiber density of the constituent fibers is higher than the fiber density of the constituent fibers of the skin-side sheet 21 . In this way, the filter sheet 22 with a relatively high fiber density is laminated on the non-skin side of the skin-side sheet 21 with a relatively low fiber density, so it exhibits excellent trapping properties for minute substances. At the same time, moisture taken into the skin-side sheet 21 can be taken into the filter sheet 22 having a high fiber density. As a result, the skin-side sheet 21 can continuously take in water droplets, and it is possible to further reduce the discomfort inside the mask 1 and the burden on the skin even when the mask is worn for a long time.

Here, fiber density is measured by the following method.
<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 method for measuring <basis weight> described above.
(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.

As the nonwoven fabric forming the filter sheet 22, any nonwoven fabric having desired properties can be used as long as the effects of the present invention are not impaired. Such a nonwoven fabric includes, for example, the same nonwoven fabric as the hydrophilic nonwoven fabric forming the skin-side sheet 21 described above. However, the nonwoven fabric of the filter sheet 22 is preferably a hydrophobic nonwoven fabric made of hydrophobic synthetic fibers. Since the filter sheet 22 is made of such a hydrophobic non-woven fabric, the moisture taken in from the skin side can be easily released to the non-skin side, and excellent transpiration can be exhibited. Polyolefin fibers such as polyethylene (PE) and polypropylene (PP) are preferably used as the hydrophobic synthetic fibers.

In the present invention, the nonwoven fabric forming the filter sheet 22 is preferably an electret-processed nonwoven fabric. When the filter sheet 22 is formed of an electret-processed nonwoven fabric, it is possible to exhibit excellent trapping properties for minute substances due to the force of static electricity, and the adhesion between the filter sheet 22 and the skin-side sheet 21 is improved. Since the performance is further improved, the moisture taken in by the skin-side sheet 21 can be transferred to the non-skin-side filter sheet 22 more quickly. As a result, high collection efficiency can be obtained, and discomfort inside the mask 1 and burden on the skin can be further reduced even when the mask is worn for a long time.

Electret processing is a process of injecting electric charges into a dielectric nonwoven fabric by a method such as DC corona discharge or a 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. For electret processing, the nonwoven is preferably hydrophobic. Furthermore, in order to increase the electrolytic density, it is more preferable that the filter sheet 22 is composed of fibers having a relatively large surface area and a small average fiber diameter (eg, 1 to 10 μm).

The thickness, grammage, etc. of the filter sheet 22 are not particularly limited as long as they do not inhibit the effects of the present invention, and any thickness, grammage, etc. can be employed. The amount is preferably in the range of 15 g/m ² to 200 g/m ² and more preferably in the range of 20 g/m ² to 150 g/m ² .

In addition, in the present invention, the skin-side sheet 21 (or, when the non-skin-side sheet 23 is provided, the skin-side sheet 21 and/or the non-skin-side sheet 23 ) can sufficiently exhibit the function of the filter sheet 22 . In such cases, the mask 1 may not have the filter sheet 22 .

(non-skin side sheet)
In this embodiment, the non-skin side sheet 23 is positioned on the non-skin side T _{2 of the mask main body 2, that is, on the non-skin side T 2 of} the filter sheet 22, and is positioned on the skin side T ₁ of the filter sheet 22. The filter sheet 22 is sandwiched together with the skin side sheet 21. - 特許庁The non-skin-side sheet 23 is made of a hydrophilic nonwoven fabric. In addition, the non-skin side sheet 23 may be formed of a single layer, or may be formed of multiple layers.

As the hydrophilic nonwoven fabric forming the non-skin side sheet 23, any nonwoven fabric having desired properties can be employed as long as the effects of the present invention are not impaired. Examples of such a nonwoven fabric include the same nonwoven fabric as the hydrophilic nonwoven fabric forming the skin-side sheet 21 described above.

In the present invention, the non-skin side sheet 23 is not limited to a hydrophilic nonwoven fabric, and may be formed of a hydrophobic nonwoven fabric similar to the filter sheet 22, but is preferably formed of a hydrophilic nonwoven fabric. The non-skin-side sheet 23 located on the non-skin side of the filter sheet 22 made of hydrophobic non-woven fabric is made of hydrophilic non-woven fabric, so that moisture migrated from the skin-side sheet 21 to the hydrophobic filter sheet 22. can be easily taken into the hydrophilic non-skin-side sheet 23 . Therefore, the skin-side sheet can continuously take in more water droplets, and it is possible to further reduce the discomfort inside the mask and the burden on the skin even when worn for a long time.

In the present invention, the hydrophilicity of the non-skin-side sheet 23 is preferably lower than the hydrophilicity of the skin-side sheet 21 . In that case, since the hydrophilicity of the non-skin side sheet 23 is relatively low, it is possible to make it difficult for the non-skin side sheet 23 to retain moisture that has migrated from the filter sheet 22 to the non-skin side sheet 23, so that the moisture can be quickly removed from the outside. can be released to Therefore, moisture can be continuously and efficiently discharged from the skin-side sheet 21 to the outside through the filter sheet 22 and the non-skin-side sheet 23 . As a result, it is possible to further reduce the discomfort inside the mask 1 and the burden on the skin even when the mask is worn for a long time.

The hydrophilicity of the sheet member can be measured by the following method.
<Hydrophilicity>
The measurement environment is assumed to have a temperature of 20° C. and a humidity of 60%.
(1) Cut out k (k: a natural number of 2 or more, example: k=2) square samples of 5 cm on a side from an arbitrary location of the mask main body 2 to be measured.
(2) Each sample is placed on 10 pieces of filter paper cut to a size of 10 cm x 10 cm, and the burette is set so that the drip port is positioned at a height of 1 cm from the surface of each sample.
(3) A drop of deionized water (approximately 0.05 mL) is dropped on each sample from a burette, and the disappearance time after the drop is dropped is measured.
(4) The burette drop test of (2) and (3) above is performed at m (m: a natural number of 5 or more, example: m = 5) per sample, and the disappearance time is less than 3 seconds. The number n of is calculated, and (n/m) x k is used as the score. As a comparison of hydrophilicity, a sample with a larger score is evaluated to have a higher hydrophilicity than a sample with a smaller score.

In the present invention, it is preferable that the fiber density of the non-skin-side sheet 23 is lower than the fiber density of the skin-side sheet 21 . In that case, since the fiber density of the non-skin side sheet 23 is relatively low, the passage of air due to exhalation etc. can be improved, and sweat inside the mask 1 and water droplets due to exhalation transpire to the outside of the mask body 2 ( release). This makes it possible to further reduce the discomfort inside the mask 1 and the burden on the skin.

In the present invention, the non-skin side of the non-skin-side sheet 23 is preferably formed by the net surface of the hydrophilic non-woven fabric forming the non-skin-side sheet 23 . Since the non-skin side sheet 23 is made of a hydrophilic non-woven fabric, the non-skin side sheet 23 easily absorbs moisture transferred to the filter sheet 22, and the non-skin side of the non-skin side sheet 23 is made of fibers. If the net surface is formed with a high density, the taken-in moisture will easily move to the non-skin side, and the moisture will evaporate more reliably even when worn for a long period of time.

The thickness, grammage, etc. of the non-skin-side sheet 23 are not particularly limited as long as they do not impede the effects of the present invention, and any thickness, grammage, etc. 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 the present invention, the highly rigid skin-side sheet 21 and the filter sheet 22 are firmly joined together, and the filter sheet 22 can be sufficiently supported by the skin-side sheet 21 alone. The mask 1 may not include the non-skin-side sheet 23 if the mask 1 can perform its function with only the sheet.

[Ear hook]
In the mask 1, the pair of ear hooks 3 are hooked on the wearer's ears when the mask 1 is worn, so that the mask main body 2 is brought into close contact with the wearer's nose and mouth. As shown in FIG. 1, the ear hooking part 3 has an annular shape in which both ends of a flat string-like, round string-like or band-like elastic member are joined to both ends of the mask main body 2 in the horizontal direction H. ing.

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, less likely to become narrowed). If the ear hooking portion 3 is formed of such a stretchable member that is less likely to be widened, the width of the ear hooking portion 3 is less likely to become narrow when the ear hooking portion 3 is hung on the ear of the wearer. Since a large area can be secured for the portion that contacts the wearer's 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.

EXAMPLES The present invention will be described below with reference to Examples, but the present invention is not limited to these Examples.

(A) Samples As samples of Examples and Comparative Examples, masks having mask main bodies having the following configurations were prepared. However, the masks of Comparative Examples 1 and 2 are commercially available products of other companies. All the masks were pleated masks as shown in FIG.
(1) Example 1
Skin side sheet: Spunbond nonwoven fabric (hydrophilicity: basis weight 30 g/m ² )
Filter sheet: Meltblown nonwoven fabric (hydrophobicity: basis weight 10 g/m ² )
Non-skin side sheet: spunbond nonwoven fabric (hydrophilicity: basis weight 20 g/m ² )
(2) Example 2
Skin-side sheet (also used as a filter sheet): gauze (hydrophilic: basis weight 55 g/m ² )
Filter sheet: None Non-skin side sheet: Spunbond nonwoven fabric (hydrophilicity: basis weight 30 g/m ² )
(3) Comparative Example 1
Skin side sheet: spunbond nonwoven fabric (hydrophilicity: basis weight 25 g/m ² )
Filter sheet: Meltblown nonwoven fabric (hydrophobicity: basis weight 25 g/m ² )
Non-skin side sheet: spunbond nonwoven fabric (hydrophobicity: basis weight 30 g/m ² )
(4) Comparative Example 2
Skin side sheet: spunbond nonwoven fabric (hydrophobicity: basis weight 40 g/m ² )
Filter sheet: Meltblown nonwoven fabric (hydrophobicity: basis weight 15 g/m ² )
Non-skin side sheet: spunbond nonwoven fabric (hydrophobicity: basis weight 30 g/m ² )
*note:
The average fiber diameter of the constituent fibers of the skin-side sheets of Examples 1 and 2 is 13 μm or less.
The average fiber diameters of the constituent fibers of the skin-side sheets of Comparative Examples 1 and 2 are 20 μm and 17 μm, respectively.
The fiber densities of the non-skin-side sheets of Examples 1 and 2 are lower than the fiber densities of the skin-side sheets.
The hydrophilicity of the non-skin-side sheets of Examples 1 and 2 is lower than that of the skin-side sheets.
(B) Evaluation The collection efficiency (%), ventilation resistance value (Pa), and transpiration rate (%) of the masks of Examples and Comparative Examples were measured by the above methods.
(C) Evaluation Results Evaluation results are shown in Table 1 below. In Examples 1 and 2, the conditions that the collection efficiency of the mask body is 70% or more, the ventilation resistance value of the mask body is 24 Pa or less, and the transpiration rate of the mask body is 65% or more were all satisfied. Therefore, with the masks of Examples 1 and 2, it was found that the airflow resistance was suppressed, the collection efficiency was increased, and the discomfort inside the mask and the burden on the skin were sufficiently reduced even when worn for a long time. . On the other hand, in Comparative Example 1, the collection efficiency and transpiration rate were not satisfied, and in Comparative Example 2, the transpiration rate was not satisfied. Therefore, it was found that the masks of Comparative Examples 1 and 2 did not sufficiently reduce the discomfort inside the mask and the burden on the skin, and in some cases, did not sufficiently collect particles.

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 mask 2 mask main body 3 ear hook

Claims (10)

A disposable mask comprising a mask main body and a pair of ear hooks extending from both lateral sides of the mask main body,
The collection efficiency of the mask body is 70% or more, the ventilation resistance value of the mask body is 24 Pa or less, and the transpiration rate of the mask body is 65% or more.
mask. The collection efficiency is 88% or more,
A mask according to claim 1. The mask main body is composed of a plurality of sheets,
The plurality of sheets are located on the skin side and comprise a skin-side sheet made of a hydrophilic nonwoven fabric or woven fabric.
A mask according to claim 1 or 2. The average fiber diameter of the constituent fibers of the skin-side sheet is 13 μm or less,
4. A mask according to claim 3. The plurality of sheets further includes a filter sheet made of nonwoven fabric laminated on the non-skin side of the skin side sheet,
A mask according to claim 3 or 4. The filter sheet is hydrophobic,
The plurality of sheets further comprises a non-skin side sheet made of a hydrophilic non-woven fabric laminated on the non-skin side of the filter sheet,
6. A mask according to claim 5. The hydrophilicity of the non-skin-side sheet is lower than the hydrophilicity of the skin-side sheet,
7. Mask according to claim 6. The fiber density of the non-skin-side sheet is lower than the fiber density of the skin-side sheet,
A mask according to claim 6 or 7. The nonwoven fabric forming the filter sheet is an electret-processed nonwoven fabric,
9. A mask according to any one of claims 5-8. The mask is a pleated mask having a plurality of folds in the vertical direction of the mask main body,
10. Mask according to any one of claims 1-9.

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