mask

Abstract

To provide a mask that can improve moisture absorption performance and achieve a smooth feel around the mouth. [Solution] The mask (1) has a planar direction extending in a vertical direction corresponding to the wearer's up-down direction and a horizontal direction corresponding to the wearer's left-right direction, a thickness direction (Z) extending to an inner side (Z1) toward the wearer and an outer side (Z2) opposite the inner side, and a breathable main body portion (2) covering at least the wearer's mouth. The main body portion has a first sheet (10) that contacts the wearer's mouth and a second sheet (20) disposed on the outer side of the first sheet. Absorbent fibers are disposed on a first outer surface (16) that constitutes the outer surface of the first sheet. The KES surface friction coefficient SMD of the first outer surface is higher than the KES surface friction coefficient SMD of the first inner surface (15) that constitutes the inner surface of the first sheet. The KES surface friction coefficient MMD of the first inner surface is lower than the KES surface friction coefficient MMD of the first outer surface.

Description

[Technical Field]

[0001] The present invention relates to a mask that covers the wearer's nose and mouth and has a breathable body portion. [Background technology]

[0002] Patent Documents 1 and 2 disclose masks that cover the wearer's nose and mouth and have a breathable main body. The main body of Patent Document 1 has an exhalation side sheet that contacts the wearer's mouth, and the exhalation side sheet is made of a mesh-like nonwoven fabric containing hydrophilic fibers. The main body of Patent Document 2 has a mouth layer that contacts the wearer's mouth, and the mouth layer has a moisture evaporation rate of 40% or more and a moisture absorption amount per area in the moisture diffusion region of 80 μg / mm 2 The nonwoven fabric is as described above.

[0003] The exhalation side sheet in Patent Document 1 is made of a mesh-like nonwoven fabric containing hydrophilic fibers, and is configured to quickly diffuse and dry water vapor and water droplets from the wearer's exhaled breath. The mouth layer in Patent Document 1 also has a moisture evaporation rate of 40% or more, and a moisture absorption rate per area in the moisture diffusion region of 80 μg / mm 2 As described above, the mask is designed to absorb moisture contained in sweat and exhaled air, and to allow moisture to easily pass from the inside of the mouth layer to the outside without remaining inside the mask. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 7142632 [Patent Document 2] Patent No. 6695177 Summary of the Invention

[0005] However, the breath-side sheet and the mouth-side layer in Patent Documents 1 and 2 have a consistent fiber structure throughout the thickness of the sheet. Therefore, increasing the moisture absorption performance of the breath-side sheet and the mouth-side layer can cause stickiness around the mouth, making it difficult to achieve a smooth texture. On the other hand, when trying to achieve a smooth texture, sufficient moisture absorption performance cannot be achieved.

[0006] The present invention has been made in consideration of such problems, and aims to provide a mask that can improve moisture absorption performance while providing a smooth texture around the mouth. [Means for solving the problem]

[0007] A mask according to one embodiment includes a main body portion that covers at least the wearer's mouth and is breathable. The main body portion has a first sheet that contacts the wearer's mouth and a second sheet that is disposed outside the first sheet. The first outer surface, which constitutes the outer surface of the first sheet, includes absorbent fibers. The KES surface friction coefficient SMD of the first outer surface is higher than the KES surface friction coefficient SMD of the first inner surface, which constitutes the inner surface of the first sheet. The KES surface friction coefficient MMD of the first inner surface is lower than the KES surface friction coefficient MMD of the first outer surface. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a side view of a mask according to an embodiment in a folded state. [Figure 2] FIG. 2 is a perspective view of the mask according to the embodiment in an unfolded state. [Figure 3] FIG. 3 is a schematic cross-sectional view of the main body of the mask. [Figure 4] FIG. 4 is a schematic enlarged plan view of the first sheet. [Figure 5]FIG. 5 is a diagram showing the measurement results of the SMD and MMD of the first sheet according to Examples 1 to 3. [Figure 6] FIG. 6 is a diagram showing the measurement results of the bending rigidity of the first sheet according to Examples 1 to 3. In FIG. [Figure 7] FIG. 7 is a cross-sectional photograph of the first sheet according to Example 1 and Example 2. As shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] (1) Overview of the embodiment At least the following matters will become clear from the description of this specification and the accompanying drawings. A first aspect of the present invention is a mask comprising a main body portion that covers at least the wearer's mouth and has a planar direction extending in a vertical direction corresponding to the up-down direction of the wearer and a horizontal direction corresponding to the left-right direction of the wearer, a thickness direction extending inward toward the wearer and outward opposite the inner side, and a breathable main body portion. The main body portion includes a first sheet that contacts the wearer's mouth and a second sheet disposed on the outside of the first sheet. A first outer surface that constitutes the outer surface of the first sheet is provided with absorbent fibers. The KES surface friction coefficient SMD of the first outer surface is higher than the KES surface friction coefficient SMD of the first inner surface that constitutes the inner surface of the first sheet. The KES surface friction coefficient MMD of the first inner surface is lower than the KES surface friction coefficient MMD of the first outer surface. The first inner surface is the inner surface of the first sheet that contacts the wearer's mouth and directly contacts the wearer's mouth. The MMD of the KES surface friction coefficient is the mean deviation of the friction coefficient, and the smaller the value, the smoother the degree of smoothness. Because the MMD of the first inner surface that touches the skin is low, it feels smooth against the skin and provides a smooth texture around the mouth. The SMD of the KES surface friction coefficient is the mean deviation of surface roughness, and the higher the value, the greater the surface irregularities. The first outer surface has a higher SMD than the first inner surface, resulting in a larger surface area. In addition, absorbent fibers are arranged on the first outer surface. Therefore, the absorbent fibers absorb moisture on the large surface area of ​​the first outer surface, improving moisture absorption performance. Because the SMD and MMD are different between the first outer surface and the first inner surface of the first sheet, it is possible to improve moisture absorption performance on the first outer surface while providing a smooth texture around the mouth on the first inner surface, achieving both.

[0010] According to a preferred embodiment, the invention according to embodiment 2 may have the following features in the invention according to embodiment 1: The first sheet is a hydrophilic sheet. The hydrophilicity of the first outer surface is higher than the hydrophilicity of the first inner surface. According to this embodiment, since the first sheet is hydrophilic, moisture around the mouth is easily drawn into the first sheet. Furthermore, the drawn moisture is easily drawn to the first outer surface, which has high hydrophilicity, making it easier for moisture to escape from the inner surface of the mask.

[0011] According to a preferred embodiment, the invention according to embodiment 3 may have the following characteristics in the invention according to embodiment 1 or 2. The first sheet is a laminated sheet in which a first inner layer and a first outer layer located outside the first inner layer are laminated. According to this embodiment, since the first sheet is composed of multiple layers, the first inner surface and the first outer surface can be formed as separate layers, and suitable surface properties and fiber arrangements can be achieved for each.

[0012] According to a preferred embodiment, the invention according to embodiment 4 may have the following features in the invention according to embodiment 3. A joint is provided that joins the first inner layer and the first outer layer. According to this embodiment, liquid migration and liquid diffusion from the first inner layer to the first outer layer can be promoted via the joint. By promoting liquid migration from the first inner layer to the first outer layer, it becomes easier to keep the first inner surface dry, and a smoother texture can be achieved around the mouth.

[0013] According to a preferred embodiment, the invention according to Aspect 5 may have the following features in the invention according to Aspect 4. The bonded portions are provided in a plurality at intervals in the planar direction. According to this embodiment, by providing a plurality of bonded portions at intervals in the planar direction, it is possible to provide a liquid transfer region formed by the bonded portions and an absorbent region without bonded portions that easily absorbs moisture. Furthermore, since a plurality of bonded portions are provided at intervals in the planar direction, the main body portion can flexibly deform using the bonded portions as deformation base points, further improving the feel against the skin.

[0014] According to a preferred embodiment, the invention according to embodiment 6 may have the following features in the invention according to embodiment 5. The first inner layer is a spunbonded nonwoven fabric and has a plurality of bonded fiber portions spaced apart in the planar direction. The pitch of the bonded portions is different from the pitch of the joined portions. The bonded portions have higher rigidity than portions where no bonded portions are provided, and the joined portions have higher rigidity than portions where no joined portions are provided. Because the pitch of the bonded portions with high rigidity is different from the pitch of the joined portions, it is possible to reduce the number of portions where both bonded portions and joined portions are provided and the rigidity is locally high, compared to a configuration in which the pitch of the bonded portions and the pitch of the joined portions are the same. This makes it possible to suppress deterioration in texture due to the formation of locally high rigidity portions.

[0015] According to a preferred embodiment, the invention according to embodiment 7 may have the following features in the invention according to any one of embodiments 4 to 6. The first inner layer and the first outer layer contain heat-sealed fibers. The joint is a fused portion formed by the fusion of the heat-sealed fibers of the first inner layer and the heat-sealed fibers of the first outer layer. The fused portion has a higher density than the surrounding area, and is therefore likely to draw moisture inside the mask into the first sheet. The moisture drawn into the first sheet can be drawn toward the high-density fused portion.

[0016] According to a preferred embodiment, the invention according to embodiment 8 may have the following features in the invention according to any one of embodiments 3 to 7. The first outer layer has a high basis weight portion and a low basis weight portion having a fiber basis weight lower than that of the high basis weight portion. According to this embodiment, a deformation base point is formed due to the difference in basis weight, making the first sheet more flexible and deformable, and improving the feel against the skin. The high basis weight portion has a larger moisture retention capacity than the low basis weight portion, and can diffuse moisture more in the planar direction. Furthermore, when the low basis weight portion and the high basis weight portion have different thicknesses, the surface area of ​​the first outer surface is increased, improving the transpiration from the first outer surface.

[0017] According to a preferred embodiment, the invention according to embodiment 9 may have the following feature in the invention according to embodiment 8: The high basis weight portion and the low basis weight portion are visible from the inside surface of the mask. According to this embodiment, the user can see the high basis weight portion and the low basis weight portion from inside the mask, and can visually recognize the absorption performance and transpiration performance.

[0018] According to a preferred embodiment, the invention according to Aspect 10 may be the invention according to any one of Aspects 1 to 9, and may have the following features. The first sheet has thermoplastic fibers having a basis weight lower than that of the sheets located outside the first sheet in the main body portion, and absorbent fibers having a basis weight higher than that of the sheets located outside the first sheet in the main body portion. Because the first sheet has thermoplastic fibers having a basis weight lower than that of the sheets located outside the first sheet, the rigidity of the first sheet side of the main body portion tends to be lower, making it easier to position the main body portion along the curves of the face. When the main body portion is pulled toward the face via the ear hooks and curved along the face, the rigidity of the outer surface of the main body portion is high, making it easier to maintain the curved shape and the three-dimensional shape. Because the first sheet has absorbent fibers having a basis weight higher than that of the sheets located outside the first sheet, the first sheet in contact with the mouth can quickly absorb moisture contained in the breath.

[0019] According to a preferred embodiment, the invention according to embodiment 11 may have the following features in the invention according to any one of embodiments 1 to 10. The first sheet includes thermoplastic fibers and absorbent fibers. The weight ratio of the absorbent fibers in the first sheet is 40% or less. According to this embodiment, the absorbent fibers absorb moisture on the first outer surface side of the first sheet while preventing the first sheet from retaining too much moisture, making it easy to achieve both moisture absorption by the first sheet and prevention of stuffiness around the mouth.

[0020] According to a preferred aspect, the invention according to aspect 12 may have the following feature in the invention according to any one of aspects 1 to 11: The basis weight of the first sheet is higher than the basis weight of the other sheets constituting the main body. According to this aspect, the first sheet has a higher basis weight among the multiple sheets constituting the main body, which makes it easier for the first sheet to exhibit moisture absorption performance and the effect of suppressing stuffiness around the mouth.

[0021] (2) Mask according to the embodiment Hereinafter, a mask 1 according to an embodiment will be described with reference to the drawings. In the following description of the drawings, identical or similar parts are designated by identical or similar reference numerals. It should be noted, however, that the drawings are schematic, and the dimensional ratios and the like may differ from those of the actual product. Therefore, specific dimensions and the like should be determined with reference to the following description. Furthermore, there may be parts with different dimensional relationships and ratios between surfaces. FIG. 1 is a side view of a mask 1 according to an embodiment in a folded state. FIG. 2 is a perspective view of a mask 1 according to an embodiment in an unfolded state. FIG. 3 is a schematic cross-sectional view of the main body 2 of the mask 1. The mask 1 may be disposable or reusable. The mask 1 may be worn to protect the wearer from droplets, pollen, dust, blood, and the like.

[0022] The mask 1 has a planar direction extending in a vertical direction X corresponding to the up-down direction of the wearer and a horizontal direction Y corresponding to the left-right direction of the wearer, and a thickness direction Z extending to an inner side Z1 facing the wearer and an outer side Z2 opposite the inner side. The inner side Z1 is the direction toward the inner surface of the mask, and the outer side Z2 is the direction toward the outer surface of the mask.

[0023] The mask 1 has a main body portion 2 and a pair of ear loops 40. The main body portion 2 is configured to cover at least the wearer's mouth. The main body portion 2 may be configured to cover both the nose and mouth. At least a portion of the main body portion 2 is breathable. The main body portion 2 is folded around a central fold line FLC that extends in the vertical direction X at the center of the main body portion 2 in the horizontal direction Y. When the mask is in use, the mask unfolds from the central fold line FLC so that the outer edges of the main body portion 2 in the horizontal direction Y are separated, thereby transforming into a three-dimensional shape as shown in FIG. 2.

[0024] The main body 2 has multiple sheets. The multiple sheets include at least a first sheet 10 that contacts the wearer's mouth and a second sheet 20 that is disposed on the outer side Z2 of the first sheet 10. The first sheet 10 is located on the innermost side of the multiple sheets. The second sheet 20 only needs to be located on the outer side Z2 of the first sheet 10, and may be located on the outermost side of the multiple sheets or on the inner side of the outermost sheet. The multiple sheets in this embodiment include the first sheet 10 that is located on the innermost side, a third sheet 30 that is located on the outermost side, and the second sheet 20 that is located between the first sheet 10 and the third sheet 30. The first sheet 10 has a first outer surface 16 that forms the outer surface of the first sheet 10 and a first inner surface 15 that forms the inner surface of the first sheet. The sheets of the main body 2 will be described in detail below.

[0025] The main body 2 may have a main body joint 3 formed by joining multiple sheets together. The main body joint 3 is sufficient as long as it joins at least the sheets together, and may also join other components (e.g., ear hooks 40) together with the sheets. The main body joint 3 is sufficient as long as it joins at least two sheets together. In a configuration having three or more layers of sheets, it is possible to join two sheets together and leave the remaining sheets unjoined. The main body joint 3 may be formed by a method such as thermal or ultrasonic welding, or bonding with an adhesive. The main body joint 3 may be provided along the outer edge of the main body 2. The outer edge of the main body 2 is the outer edge of the main body 2 in a plan view, and the outer edge is the portion within 10 mm from the outer edge. The main body joint 3 may be arranged in a dot-like manner with a gap between them, as in this embodiment, or may be arranged in a line.

[0026] The ear hooks 40 are connected to both sides of the main body 2 in the lateral direction Y. They may be formed separately from the main body 2 or may be integrated with the main body 2. In this embodiment, the ear hooks 40 are formed separately from the main body 2 and joined to both sides of the main body 2 via ear hook joints 5. The ear hooks 40 may be made of a string-like member as in this embodiment, or may be made of a sheet with cutouts. The ear hooks 40 may be stretchable in the lateral direction Y and may have higher stretchability than the sheet that forms the main body 2.

[0027] The mask 1 of this embodiment is configured to achieve a smooth feel around the mouth while improving moisture absorption performance. Next, the configuration for achieving a smooth feel around the mouth while improving moisture absorption performance will be described in detail. The SMD of the KES surface friction coefficient of the first outer surface 16 of the first sheet 10 is higher than the SMD of the KES surface friction coefficient of the first inner surface 15 of the first sheet 10. The MMD of the KES surface friction coefficient of the first inner surface 15 is lower than the MMD of the KES surface friction coefficient of the first outer surface 16. Absorbent fibers are arranged on the first outer surface 16 of the first sheet 10.

[0028] The first inner surface 15 is the inner surface of the first sheet 10 that contacts the wearer's mouth and is in direct contact with the wearer's mouth. The MMD of the KES surface friction coefficient is the mean deviation of the friction coefficient, and the smaller the value, the higher the degree of smoothness. Because the first inner surface 15 that contacts the skin has a low MMD, it feels smooth against the skin and provides a smooth texture around the mouth. The SMD of the KES surface friction coefficient is the mean deviation of surface roughness, and the larger the value, the greater the surface irregularities. The first outer surface 16 has a higher SMD than the first inner surface 15, resulting in a larger surface area. In addition, absorbent fibers are arranged on the first outer surface 16. Therefore, the absorbent fibers absorb moisture on the large surface area of ​​the first outer surface 16, improving moisture absorption performance. Because the SMD and MMD of the first outer surface 16 and the first inner surface 15 of the first sheet 10 are different, it is possible to achieve both improved moisture absorption performance on the first outer surface 16 and a smooth texture around the mouth on the first inner surface 15.

[0029] It is sufficient that at least a portion of the absorbent fiber is disposed on the first outer surface 16, and the absorbent fiber may be disposed inside the first sheet 10 in the thickness direction Z and / or on the first inner surface 15. Furthermore, when the first outer layer 12 constituting the first outer surface 16 has absorbent fiber, it is considered that the absorbent fiber is disposed on the first outer surface 16.

[0030] The absorbent fibers include cellulosic fibers, such as natural cellulose fibers, regenerated cellulose fibers, refined cellulose fibers, and semi-synthetic cellulose fibers. Examples of natural cellulose fibers include plant fibers, such as pulp fibers, seed hair fibers (e.g., cotton fibers), bast fibers (e.g., hemp), leaf vein fibers (e.g., Manila hemp), and fruit fibers (e.g., palm). Examples of pulp fibers include those known in the art as pulp fibers, such as wood pulp fibers and non-wood pulp fibers. Examples of wood pulp fibers include softwood pulp fibers and hardwood pulp fibers. Examples of non-wood pulp fibers include straw pulp fibers, bagasse pulp fibers, reed pulp fibers, kenaf pulp fibers, mulberry pulp fibers, bamboo pulp fibers, hemp pulp fibers, and cotton pulp fibers (e.g., cotton linter fibers).

[0031] The cotton fiber includes Hirsutum cotton fiber (e.g., upland cotton), Barbadense cotton fiber, Arboreum cotton fiber, and Helbaceum cotton fiber. The cotton fiber may also be organic cotton fiber or Pre-Organic Cotton (trademark) fiber. Organic cotton fiber refers to cotton certified by GOTS (Global Organic Textile Standard).

[0032] Examples of the regenerated cellulose fibers include rayon, such as viscose rayon, polynosic, and modal obtained from viscose, and cuprammonium rayon (also known as "cupra") obtained from a cuprammonium salt solution of cellulose. Examples of the purified cellulose fibers include lyocell, specifically, pulp dissolved in an aqueous solution of N-methylmorpholine N-oxide to form a spinning solution (dope), which is then extruded into a dilute solution of N-methylmorpholine N-oxide to form fibers. The purified cellulose is commercially available, for example, under the trademark Tencel. Examples of the semi-synthetic fibers include semi-synthetic cellulose, such as acetate fibers, for example, triacetate and diacetate fibers.

[0033] The first sheet 10 may be a hydrophilic sheet. The hydrophilic sheet may be a sheet having hydrophilic fibers or a sheet that has been subjected to a hydrophilic treatment. The hydrophilicity of the first sheet 10 makes it easier to absorb moisture contained in the wearer's sweat and exhaled breath, and to draw moisture around the mouth into the first sheet 10. The hydrophilicity of the first outer surface 16 may be higher than the hydrophilicity of the first inner surface 15. According to this embodiment, by drawing the drawn moisture to the first outer surface side, which has a higher hydrophilicity, the moisture on the inner surface of the mask is more easily released.

[0034] The hydrophilicity of a sheet can be measured using the following method. The measurement environment is set to a temperature of 20°C and humidity of 60%. (1) Cut k square samples (k is a natural number equal to or greater than 2, e.g., k = 2) with sides of 5 cm from any location of the measurement target. (2) Place each sample on 10 pieces of filter paper cut to a size of 10 cm x 10 cm, and set a buret so that the drop nozzle is positioned 1 cm above the surface of each sample. (3) Drop one droplet of deionized water (approximately 0.05 mL) from the buret onto each sample, and measure the time it takes for the droplet to disappear. When measuring the hydrophilicity of the first outer surface, place the sample with the first outer surface facing up, and drop the droplet onto the first outer surface. (4) The burette drop tests (2) and (3) above are performed on m (m: a natural number equal to or greater than 5, e.g., m=5) spots on one sample, and the number n of spots that disappear in less than 3 seconds is calculated, and (n / m) x k is used as a score. The hydrophilicity is evaluated such that a higher score indicates higher hydrophilicity than a lower score.

[0035] The first sheet 10 may be a laminated sheet formed by laminating a first inner layer 11 and a first outer layer 12 located outside the first inner layer. According to this embodiment, since the first sheet 10 is composed of multiple layers, the first inner surface 15 and the first outer surface 16 can be formed as separate layers, thereby achieving surface properties and fiber arrangements suitable for each. The first sheet 10 of this embodiment is composed of a laminated sheet of the first inner layer 11 made of a hydrophilic spunbond nonwoven fabric and the first outer layer 12 made of a spunlace nonwoven fabric.

[0036] A joint 13 may be provided that joins the first inner layer 11 and the first outer layer 12. The joint 13 may be formed by a welded portion that welds the first inner layer 11 and the first outer layer 12 together. According to this embodiment, liquid migration and liquid diffusion from the first inner layer 11 to the first outer layer 12 can be promoted via the joint 13. By promoting liquid migration from the first inner layer 11 to the first outer layer 12, it becomes easier to keep the first inner surface 15 dry, and a smoother texture can be achieved around the mouth.

[0037] A plurality of the bonded portions 13 may be provided at intervals in the planar direction. FIG. 4 is a schematic enlarged plan view of each layer of the first sheet 10. FIG. 4(A) is a schematic diagram of the first inner layer 11, showing the bonded portion described below. FIG. 4(B) is a schematic diagram of the first outer layer 12, showing the high basis weight portion and the low basis weight portion described below. FIG. 4(C) is a schematic diagram of a sheet in which the first inner layer 11 and the first outer layer 12 are laminated, showing the bonded portions 13. In this embodiment, the bonded portions 13 are arranged at intervals in the longitudinal direction X and at intervals in the transverse direction Y. By providing a plurality of bonded portions 13 at intervals in the planar direction, it is possible to provide a liquid transfer region formed by the bonded portions and an absorbent region without the bonded portions 13 that easily absorbs moisture. Alternatively, the bonded portions 13 may be arranged at intervals in the planar direction throughout the entire first sheet 10. Since a plurality of joints 13 are provided at intervals in the planar direction, the main body 2 can flexibly deform with the joints 13 as deformation base points, thereby further improving the feel against the skin.

[0038] The first inner layer 11 and the first outer layer 12 may contain heat-sealed fibers. The joint 13 may be a fused portion formed by the fusion of the heat-sealed fibers of the first inner layer 11 and the heat-sealed fibers of the first outer layer 12. The fused portion has a higher density than the surrounding area and easily draws moisture inside the mask into the first sheet 10. Moisture drawn into the first sheet 10 can be drawn toward the high-density fused portion. In this embodiment, the first outer layer 12 contains CoPET, the first inner layer 11 contains polypropylene, and the joint 13 is formed by ultrasonic sealing.

[0039] The first inner layer 11 may be a spunbonded nonwoven fabric having a plurality of bonded fiber portions 111 spaced apart in the planar direction. The pitch of the bonded portions 111 may differ from the pitch of the bonded portions 13. As shown in FIG. 4(A), the first inner layer 11 has a plurality of bonded portions 111, each of which bonds the fibers constituting the first inner layer 11. The bonded portions 111 have higher rigidity than portions where the bonded portions 111 are not provided, and the bonded portions 13 have higher rigidity than portions where the bonded portions 13 are not provided. Because the pitch of the highly rigid bonded portions 111 is different from the pitch of the bonded portions 13, the number of portions where the bonded portions 111 and the bonded portions 13 are both provided and where the rigidity is locally increased can be reduced compared to a configuration where the pitch of the bonded portions 111 and the pitch of the bonded portions 13 are the same. This prevents deterioration of the texture due to the formation of locally high rigid portions. Furthermore, as shown in FIG. 4, the pitch of the bonded portions 111 may be shorter than the pitch of the bonded portions 13.

[0040] The first outer layer 12 may be provided with a high basis weight portion 121 and a low basis weight portion 122 having a fiber basis weight lower than that of the high basis weight portion 121. According to this embodiment, a deformation base point is formed due to the difference in basis weight, making the first sheet 10 more flexible and deformable, and improving the feel against the skin. The high basis weight portion 121 has a larger moisture retention capacity than the low basis weight portion 122 and can diffuse moisture more in the planar direction. As shown in FIG. 3, the thickness of the high basis weight portion 121 may be greater than the thickness of the low basis weight portion 122. According to this embodiment, the low basis weight portion 122 and the high basis weight portion 121 form unevenness, increasing the surface area of ​​the first outer surface 16 and improving transpiration from the first outer surface 16. As shown in FIG. 4(B), the high basis weight portions 121 may extend in the longitudinal direction X and be spaced apart in the transverse direction Y, and may also extend in the transverse direction Y and be spaced apart in the longitudinal direction X. The low basis weight portion 122 may be surrounded by the high basis weight portion 121 .

[0041] The high basis weight portion 121 and the low basis weight portion 122 may be visible from the inside surface of the mask 1. According to this embodiment, the user can see the high basis weight portion 121 and the low basis weight portion 122 from inside the mask 1, and visually recognize the absorption performance and transpiration performance. In this specification, "visible" means that a subject with good visual acuity (1.0 or better) can see the high basis weight portion 121 and the low basis weight portion 122 when looking at an object at a distance of approximately 30 to 50 cm in a brightly lit room (approximately 500 to 750 lux) with daylight white light (approximate color temperature 4600 to 5400 K (Kelvin)). The high basis weight portion 121 and the low basis weight portion 122 may also be visible from the outside surface of the mask 1.

[0042] The first sheet 10 may have thermoplastic fibers with a basis weight lower than that of the sheets located outside the first sheet 10 in the main body portion 2, and absorbent fibers with a basis weight higher than that of the sheets located outside the first sheet 10 in the main body portion 2. The sheets located outside the first sheet 10 include all sheets located outside the first sheet 10, and in this embodiment, include the second sheet 20 and the third sheet 30. The basis weight of the thermoplastic fibers in the first sheet 10 is lower than the combined basis weight of the thermoplastic fibers in the second sheet 20 and the third sheet 30, and the basis weight of the water-absorbent fibers in the first sheet 10 is higher than the combined basis weight of the water-absorbent fibers in the second sheet 20 and the third sheet 30. According to this embodiment, the first sheet 10 has thermoplastic fibers with a basis weight lower than that of the sheets located outside the first sheet 10, which tends to reduce the rigidity of the first sheet 10 side of the main body portion 2, making it easier to position the main body portion 2 along the curvature of the face. When the main body 2 is pulled toward the face via the ear hooks 40 and curves along the face, the rigidity of the outer surface of the main body 2 tends to increase, making it easier to maintain the curved shape and maintaining a three-dimensional shape. The first sheet 10 has absorbent fibers with a higher basis weight than the sheets positioned outside the first sheet 10, so that the first sheet 10 in contact with the mouth can quickly absorb moisture contained in the breath.

[0043] Table 1 shows the configuration of the sheet of the main body portion of this embodiment. [Table 1]

[0044] The first sheet 10 may contain thermoplastic fibers and absorbent fibers. The weight ratio of the absorbent fibers in the first sheet 10 may be 40% or less. According to this embodiment, the absorbent fibers absorb moisture on the first outer surface 16 side of the first sheet 10 while preventing the first sheet 10 from retaining too much moisture, making it easy to achieve both moisture absorption by the first sheet 10 and prevention of stuffiness around the mouth. Furthermore, from the viewpoint of ensuring the moisture absorption by the first sheet 10, the weight ratio of the absorbent fibers in the first sheet 10 may be 10% or more.

[0045] The basis weight of the first sheet 10 may be higher than the basis weight of the other sheets constituting the main body 2. That is, the basis weight of the first sheet 10 may be higher than the basis weight of the second sheet 20, and may be higher than the basis weight of the third sheet 30. According to this embodiment, of the multiple sheets constituting the main body 2, the basis weight of the first sheet 10 is higher, which makes it easier for the first sheet 10 to exhibit moisture absorption performance and the effect of suppressing stuffiness around the mouth. Furthermore, the basis weight of the first sheet 10 may be higher than the total basis weight of the other sheets constituting the main body 2, and may be higher than the total basis weight of the second sheet 20 and the third sheet 30.

[0046] 5 is a diagram showing the measurement results of SMD, MMD, and MIU for the first sheet according to the embodiment (Example 1) and the first sheets according to other embodiments (Examples 2 and 3). The first outer layer of Example 2 was the same as that of Example 1, and the first inner layer of Example 2 was 30 g / m 2 The first outer layer of Example 3 is a spunbond nonwoven fabric of 30 g / m2 containing 60% rayon, 30% PET, and 10% Co-pet, and the first outer layer is entangled with the first inner layer to form a composite to form the first sheet. 2 The first inner layer of Example 3 is a spunlace nonwoven fabric of 15 g / m 2 The first outer layer is entangled with the first inner layer to form a composite, thereby forming the first sheet.

[0047] Here, MIU is an index of the slipperiness or non-slipperiness perceived by a wearer when rubbing the surface of a sheet; the larger this value, the more non-slip the wearer perceives it. The method for measuring SMD (surface roughness), MIU (mean coefficient of friction), and MMD (variation of mean coefficient of friction) is as follows: After cutting out a test piece of a predetermined size (e.g., 100 mm x 10 mm) from the sheet to be measured, the SMD, MIU, and MMD in each direction of the test piece are measured using a friction tester KES SE (manufactured by Kato Tech Co., Ltd.), and the average values ​​for each direction are calculated, thereby obtaining the SMD, MIU, and MMD of the sheet. New measurement terminal ·FB4-A:Optional ·SENS-MIU:STD SENS-SMD:STD ·Frictional static load: 50g Roughness static load: 10g ·Operating speed: 1mm / sec

[0048] In all of Examples 1 to 3, absorbent fibers are arranged on the first outer surface that constitutes the outer surface of the first sheet, and the SMD of the KES surface friction coefficient of the first outer surface is higher than the SMD of the KES surface friction coefficient of the first inner surface of the first sheet, and the MMD of the KES surface friction coefficient of the first inner surface is lower than the MMD of the KES surface friction coefficient of the first outer surface.

[0049] 6 is a diagram showing the measurement results of the bending rigidity of the first sheets according to Examples 1 to 3. In the first sheet according to Example 1, the first inner layer and the first outer layer are joined at a fused joint, while in the first sheets according to Examples 2 and 3, the first inner layer and the first outer layer are joined by entanglement of the fibers and do not have a fused joint. It was found that the first sheet according to Example 1 has a lower bending rigidity than the first sheets according to Examples 2 and 3 and is more likely to flexibly deform around the fused joint.

[0050] The bending stiffness can be measured using, for example, a KES-FB2-A pure bending tester manufactured by Kato Tech Co., Ltd., or an equivalent device. The measurement direction (bending direction) is the vertical or horizontal direction of the mask 1. The test piece is clamped and fixed at both ends in the measurement direction (bending direction) by the chucks of the tester, and the test piece is bent in the measurement direction. At this time, the bending deformation rate is 0.5 cm. -1 / sec, maximum curvature +2.5cm -1 Bend it to the front side up to a maximum curvature of -2.5cm. -1 Bending stiffness B (gf cm 2 / cm) is calculated from the average value of the slope of the bending moment M (slope of the MK curve) for the curvature K = 0.5 to 1.5 when bending on the front side and the slope of the bending moment M (slope of the MK curve) for the curvature K = -0.5 to -1.5 when bending on the back side.

[0051] FIG. 7 shows cross-sectional photographs of the first sheet of Example 1 and the first sheet of Example 2. FIGS. 7(A) and (B) show the first sheet of Example 1, and FIGS. 7(C) and (D) show the first sheet of Example 2. As shown in FIG. 7, the first inner surface of Example 1 has fewer protruding fibers and is smoother overall than the first inner surface of Example 2. It was also found that the first outer surface of Example 1 has deeper irregularities and a larger surface area than the first inner surface of Example 1.

[0052] Although the present invention has been described in detail using the above-described embodiments, it will be apparent to those skilled in the art that the present invention is not limited to the embodiments described herein. The present invention can be implemented in modified and altered forms without departing from the spirit and scope of the present invention as defined by the claims. Therefore, the description in this specification is intended to be illustrative and does not have any limiting meaning on the present invention. [Explanation of symbols]

[0053] 1: Mask 2: Main body 10: First sheet 11: First inner layer 12: 1st outer layer 13:Joint part 15: First inner surface 16: 1st outer surface 20: Second sheet 111:Joining part 121: High basis weight part 122:Low basis weight part X: Vertical direction Y: Horizontal direction Z: Thickness direction Z1: Inside Z2 :Outside

Claims

1. A planar direction extending in a vertical direction corresponding to the up-down direction of the wearer and a horizontal direction corresponding to the left-right direction of the wearer; a thickness direction extending inward toward the wearer side and outward opposite the inner side; A mask comprising: a main body portion that covers at least the mouth of the wearer and has breathability; The main body portion has a first sheet that contacts the mouth of the wearer and a second sheet that is disposed outside the first sheet, a first outer surface that constitutes the outer surface of the first sheet has absorbent fibers arranged thereon; the KES surface friction coefficient SMD of the first outer surface is higher than the KES surface friction coefficient SMD of a first inner surface constituting the inner surface of the first sheet; the MMD of the KES surface coefficient of friction of the first inner surface is lower than the MMD of the KES surface coefficient of friction of the first outer surface; the first sheet is a laminated sheet in which a first inner layer and a first outer layer located outside the first inner layer are laminated together, the first outer layer is provided with a high basis weight portion and a low basis weight portion having a fiber basis weight lower than that of the high basis weight portion, The thickness of the high basis weight portion is greater than the thickness of the low basis weight portion, the high basis weight portions extend in the longitudinal direction and are spaced apart in the transverse direction, and also extend in the transverse direction and are spaced apart in the longitudinal direction; The mask, wherein the low basis weight portion is surrounded by the high basis weight portion.

2. the first sheet is a hydrophilic sheet, The mask of claim 1 , wherein the first outer surface is more hydrophilic than the first inner surface.

3. The mask according to claim 1 or 2, further comprising a joint portion that joins the first inner layer and the first outer layer.

4. The mask according to claim 3 , wherein a plurality of the joints are provided at intervals in the planar direction.

5. the first inner layer is a spunbond nonwoven fabric having a plurality of fiber bonded portions arranged at intervals in the planar direction, The mask of claim 4 , wherein the pitch of the coupling portions and the pitch of the joint portions are different.

6. the first inner layer and the first outer layer have heat-sealable fibers; The mask according to claim 3 , wherein the joint portion is a fused portion formed by fusion of the heat-fusible fibers of the first inner layer and the heat-fusible fibers of the first outer layer.

7. 3. The mask according to claim 1, wherein the high basis weight portion and the low basis weight portion are visible from an inner surface of the mask.

8. the first sheet has thermoplastic fibers and water-absorbent fibers; 3. The mask according to claim 1, wherein the weight ratio of the absorbent fiber in the first sheet is 40% or less.

9. The mask according to claim 1 or 2, wherein the first sheet has a basis weight greater than that of the other sheets constituting the main body portion.

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