阅读说明：本技术 一次性口罩 (Disposable mask ) 是由 古屋芳织 柴田彰 于 2018-04-26 设计创作，主要内容包括：提供一次性口罩,能够由口罩主体充分覆盖佩戴者的口部及鼻部,并且能够贴合于颌下适当的位置。口罩(10)的口罩主体(20)包括将形成口罩主体(20)的片折叠成褶皱状而形成的多个褶部(60),口罩主体(20)的下端缘(20b)具有向上方呈凸状弯曲的中央部分(25)。(Provided is a disposable mask which can sufficiently cover the mouth and nose of a wearer with a mask body and can be fitted to an appropriate position under the jaw. A mask body (20) of a mask (10) is provided with a plurality of folds (60) formed by folding a sheet forming the mask body (20) into a corrugated shape, and a lower end edge (20b) of the mask body (20) is provided with a central part (25) which is convexly curved upward.)

1. A disposable mask having a vertical direction and a width direction, comprising a mask body and a pair of ear hanging portions extending from both side edges of the mask body,

the disposable mask is characterized in that,

the mask body includes a plurality of folding portions formed by folding a main body sheet forming the mask body into a folded shape,

the lower end edge of the mask body has a central part which is convexly curved upwards.

2. The mask of claim 1 wherein,

the central portion of the lower end edge is located between the lower fixed ends of the pair of ear portions in the width direction, and the uppermost portion located uppermost in the central portion is located below an upper edge of the lower fixed end of the ear portion.

3. The mask of claim 2 wherein,

the mask body has: a lower seal region extending along the central portion of the lower end edge; and a cross seal portion extending inward from the both side edges of the mask body in the width direction above the lower seal region,

the lower fixed end of the hanger part is located at a position surrounded by the lower side sealing region and the crossing sealing part.

4. The mask of claim 3 wherein,

and a lower fixing portion for fixing the lower fixing end of the pair of ear hanging portions to the mask body, wherein a part of the lower fixing portion and a part of the crossing sealing portion overlap each other.

5. The mask of claim 2 wherein,

and a distance between a virtual line connecting both ends of the central portion and extending linearly in the width direction and the uppermost portion in the up-down direction is 5 to 15 mm.

6. The mask according to any one of claims 3 to 5,

the fold portion has a 1 st fold portion, a 2 nd fold portion, a 3 rd fold portion, and a 4 th fold portion arranged in this order in the vertical direction, a fold region having a substantially Ω -shaped cross section is formed by the 2 nd fold portion and the 3 rd fold portion, and a side joining portion forming a side seal region is not disposed in a central portion of the fold region where the body panel is not folded and a portion of the 3 rd fold portion between an outer fold portion of the outer surface of the mask body extending in the width direction and an inner fold portion of the 4 th fold portion extending in the width direction at the inner surface of the mask body.

7. The mask according to any one of claims 1 to 6 wherein,

the above-described fold portion has an upper fold portion located above a transverse center line, and a pair of fold adjustment members facing each other in the width direction are arranged in the upper fold portion so as to suppress the upper fold portion from spreading, wherein the transverse center line is a line bisecting the vertical dimension of the mask body.

Technical Field

The invention relates to a disposable mask.

Background

Disposable masks have been known from the past. For example, patent document 1 discloses a disposable mask including a mask body and a pair of ear loops extending from both side edges of the mask body in a ring shape.

Disclosure of Invention

In the disposable mask disclosed in patent document 1, the mouth-nose covering portion of the mask body has a plurality of fold portions formed by folding a sheet forming the mask body into a folded shape, and an extension region which can be extended in the vertical direction of the fold portions is expanded when worn, so that the entire mouth and nose of a wearer can be covered.

In this mask, since the upper and lower end edges of the mask body have a shape extending linearly in the width direction, the center region of the mask body where the stretched regions of the pleats are located is the same as the longitudinal dimensions of the regions on both sides of the mask body where the pleats are fixed in the state before wearing, and the stretched regions are stretched and the longitudinal dimension of the center region is increased when wearing the mask. When the wearer is a child and the chin is round and small, the central region of the mask body may extend downward and further extend from the chin to the throat of the wearer, which may cause discomfort to the wearer. In order to avoid this situation, if the longitudinal dimension of the entire mask body is reduced, there is a fear that the mouth and nose of the wearer cannot be sufficiently covered.

The present invention improves the conventional disposable mask, and an object of the present invention is to provide a disposable mask which can sufficiently cover the mouth and nose of a wearer with a mask body and can be attached to an appropriate position under the jaw.

In order to solve the above problems, the present invention relates to a disposable mask having a vertical direction and a width direction, and including a mask body and a pair of ear loops extending from both side edges of the mask body.

The mask body of the disposable mask of the present invention includes a plurality of folds formed by folding a body sheet forming the mask body in a corrugated shape, and the lower edge of the mask body has a central portion curved convexly upward.

The disposable mask of the present invention includes the following preferred embodiments.

(1) The central portion of the lower end edge is located between the lower fixed ends of the pair of ear portions in the width direction, and the uppermost portion located uppermost in the central portion is located below an upper edge of the lower fixed end of the ear portion.

(2) The gauze mask main part has downside sealed area and crosses the sealing, downside sealed area follows the lower extreme edge the central part extends, it is in to cross the sealing the top in downside sealed area is followed the both sides edge of gauze mask main part is inboard in extend in the width direction, the lower stiff end of hangers portion be located by downside sealed area with cross the position that the sealing surrounded.

(3) And a lower fixing portion for fixing the lower fixing end of the pair of ear hanging portions to the mask body, wherein a part of the lower fixing portion and a part of the crossing sealing portion overlap each other.

(4) And a distance between a virtual line connecting both ends of the central portion and extending linearly in the width direction and the uppermost portion in the up-down direction is 5 to 15 mm.

(5) The fold portion has a 1 st fold portion, a 2 nd fold portion, a 3 rd fold portion, and a 4 th fold portion arranged in this order in the vertical direction, a fold region having a substantially Ω -shaped cross section is formed by the 2 nd fold portion and the 3 rd fold portion, and a side joint portion forming a side seal region is not disposed in a central portion of the fold region where the body panel is not folded and a portion of the 3 rd fold portion between an outer fold portion extending in the width direction on the outer surface of the mask body and an inner fold portion extending in the width direction on the inner surface of the mask body between the 4 th fold portion.

(6) The pleat has an upper pleat located above a transverse center line bisecting the vertical dimension of the mask body, and a pair of pleat adjustment members facing each other in the width direction are arranged in the upper pleat to suppress the expansion thereof.

Effects of the invention

According to the disposable mask of the present invention, since the mask body includes the plurality of folds formed by folding the body sheet into the folded shape and the lower end edge of the mask body has the central portion curved convexly upward, the mask body is attached to the face of the wearer in the wearing state and the lower end edge of the mask body extends in the width direction at an appropriate position under the jaw, and therefore, the wearer can be prevented from feeling uncomfortable while reliably covering the chin portion.

Drawings

The drawings show specific embodiments of the present invention, including not only essential constituents of the invention but also alternative or preferred embodiments.

Fig. 1 is a plan view of a disposable mask according to embodiment 1 of the present invention, as viewed from the front.

Fig. 2 is an enlarged plan view of the mask body.

Fig. 3 (a) is a perspective view of one side portion of the mask as viewed from the outside, taken along line III-III (a) of fig. 2, and fig. 3 (b) is a partially enlarged view of the region surrounded by the dashed dotted line iv (b) of fig. 3 (a).

Fig. 4 is a side view of the mask in a worn state.

Fig. 5 is a view of the mask as viewed from below in a worn state.

Fig. 6 is a plan view of the disposable mask of embodiment 2.

Fig. 7 is a longitudinal sectional view of the disposable mask of embodiment 2 in a wearing state.

Fig. 8 is a plan view of the disposable mask of embodiment 3.

Detailed Description

The following embodiments relate to the disposable mask 10 shown in fig. 1 to 8, and include not only essential components of the present invention but also optional or preferable components.

< embodiment 1 >

Referring to fig. 1 to 4, a mask 10 according to embodiment 1, which is an example of a disposable mask of the present invention, has a vertical direction (longitudinal direction) Y and a width direction X, and includes: a skin-facing surface (inner surface) and a non-skin-facing surface (outer surface) opposite thereto; a transverse center line Q bisecting the size of the vertical direction Y; a mask body 20; and a pair of annular ear portions 30 extending from both side edges 20c, 20d of the mask body 20.

The mask body 20 is formed from a body sheet and has an upper edge 20a extending linearly in the width direction X, a lower edge 20b extending in the width direction X, and both side edges 20c, 20d extending in the vertical direction Y between the upper and lower edges 20a, 20 b. Further, the mask body 20 includes: an upper end portion 21 extending in the width direction X along the upper end edge 20 a; a lower end portion 22 extending in the width direction X along the lower end edge 20 b; and an oronasal covering 23 located between the upper end 21 and the lower end 22. The mask body 20 further has a curved corner 24 where the upper and lower edges 20a, 20b intersect with the side edges 20c, 20 d. The corner portion 24 has a curved shape rather than a sharp shape, and thus no stimulus is given even if the wearer's face touches the corner portion 24.

The lower edge 20b of the mask body 20 has a shape gently curved upward. Specifically, the lower edge 20b has a central portion 25 extending in the width direction X between the corner portions 24 having a shape convexly curved downward, and having a shape convexly curved upward. The opposite ends 25a, 25b of the central portion 25 are portions that become starting points in the width direction X of the central portion 25, and are intersections of the outline of the corner portions 24 and the upwardly curved outline, and the length dimension L2 of the central portion 25 has the length of the upwardly curved outline between the opposite ends 25a, 25 b. As described above, the central portion 25 of the lower end edge 20b has a shape curved convexly upward, and thus the central portion of the lower end portion 22 of the mask body 20 also has a shape curved convexly upward. Further, the corner portion 24 has a shape curved convexly downward, but may have a shape in which, for example, a portion forming a part of the lower end edge 20b, which is angular, extends substantially linearly in the width direction X, and in this case, the central portion 25 of the lower end edge 20b has a shape curved convexly upward, and portions positioned on both sides thereof in the width direction X become both linear side portions.

Here, the transverse center line Q is a line that bisects the dimension of the mask body 20 in the vertical direction Y, and when the lower edge 20b has a shape that curves convexly upward as in the present embodiment, it can be said that the dimension in the vertical direction Y is not constant in the mask body 20. The transverse center line Q is a line that bisects the interval between the uppermost portion and the lowermost portion of the mask body 20, and in the present embodiment, it can be said that the dimension in the vertical direction Y of the side edges 20c and 20d extending in parallel in the vertical direction Y is bisected.

The mask 10 can be used for all ages and sexes without limitation, such as adults and children, and the mask body 20 has a dimension W1 in the vertical direction Y of 75 to 100mm and a dimension L1 in the width direction X of 115 to 185mm, for example. However, when the mask 10 is used as a so-called child mask for young people of 6 to 9 years old, that is, for children, it is preferable that the mask body 20 has a dimension W1 in the vertical direction Y (the length of both side edges 20c, 20 d) of 75 to 95mm and a dimension L1 in the width direction X (the length of both upper and lower end edges 20a, 20b) of 115 to 135 mm.

Since the central portion 25 of the lower end edge 20b has an upwardly curved shape in this manner, the length L2 is larger than the length L3 of a virtual line K1 that linearly connects the two ends 25a and 25b when the central portion 25 extends linearly in the width direction X. Specifically, for example, in the mask 10 for children, when the length L3 of the virtual line K1 is 105 to 125mm, the length L2 of the center portion 25 is 110 to 133mm, which is longer than the length L3 by about 5 to 8 mm.

Referring to fig. 4 (b), the main body sheet forming the mask body 20 is composed of an inner layer sheet 41 positioned on the skin-facing surface side, an outer layer sheet 42 positioned on the non-skin-facing surface side, and an intermediate layer sheet 43 positioned between the inner and outer layer sheets 41, 42. The inner and outer sheets 41, 42 and the intermediate sheet 43 are made of, for example, heat-fusible fibers and have a mass of 10 to 40g/m²The fiber nonwoven fabric sheet having air permeability may be formed of various known fiber nonwoven fabrics such as a meltblown fiber nonwoven fabric, a spunbonded fiber nonwoven fabric, an SMS fiber nonwoven fabric, and a thermal air fiber nonwoven fabric, and may be formed of a sheet material having good air permeability such as a gauze and a cotton cloth. The intermediate layer sheet 43 is preferablyA nonwoven fabric having a filtering function of preventing fine particles from passing therethrough is used.

The mask body 20 of the present embodiment has a mass of, for example, 20 to 45g/m²The spunlace nonwoven fabric or spun-bonded nonwoven fabric is used as the outer layer sheet 42, and the mass of the spunlace nonwoven fabric or spun-bonded nonwoven fabric is 20-30 g/m²The melt-blown nonwoven fabric (2) has a mass of 20 to 30g/m as the intermediate layer sheet (43)²The inner layer sheet 41 is a spunbonded nonwoven fabric. In addition to the illustrated example, the mask body 20 may be formed of a laminate of two or more sheets, and for example, a plurality of intermediate layer sheets 43 containing an antibacterial agent, an aromatic agent, or the like may be interposed between the inner and outer layer sheets 41 and 42 in addition to the fine particle filtering function.

The mask body 20 has an upper folded part 26 at the upper end 21 and a lower folded part 27 at the lower end 22, wherein the upper folded part 26 is formed by folding a part of the inner layer sheet 41 and a part of the intermediate layer sheet 43 toward the lower side of the outer surface of the mask body 20 via the upper end edge of the outer layer sheet 42, and the lower folded part 27 is formed by folding a part of the outer layer sheet 42 toward the upper side of the outer surface of the mask body 20 along the lower end edge 20b of the mask body 20.

The inner and outer sheets 41 and 42 and the intermediate sheet 43 are joined to each other by a peripheral seal region 50 intermittently extending along the outer peripheral edge of the mask body 20. The outer peripheral seal region 50 has: an upper side seal region 51 formed by 2 lines intermittently extending in the width direction X along the upper end edge 20a of the mask body 20; a lower side seal region 52 intermittently extending in the width direction X along the lower end edge 20 b; and side seal regions 53 intermittently extending in the vertical direction Y along both side edges 20c, 20 d.

The outer peripheral seal region 50 is a fusion seal line in which the inner and outer layer sheets 41 and 42 and the intermediate layer sheet 43 are fused to each other at a plurality of intermittently arranged bonding portions, and the sheets 41 to 43 are bonded only to the outer peripheral seal region 50 and are not bonded to each other at other portions. Therefore, the mask 10 is superior in flexibility and air permeability as a whole, compared to the case where the entire inner surfaces of the respective sheets 41 to 43 are joined to each other.

The joint portions 51a, 52a forming the upper side seal region 51 and the lower side seal region 52 are formed in a substantially elliptical shape that is long in the width direction. On the other hand, the side seal region 53 is formed by large and small substantially star-shaped joint portions 53a, 53b and a substantially circular joint portion 53 c. Unlike the upper and lower side seal regions 51, 52, the side seal region 53 is formed by a plurality of designed joint portions 53a to 53c, and thus the mask 10 is superior in appearance in front view and side view compared to the case where the entire outer peripheral seal region 50 is formed by only joint portions of a substantially circular or substantially elliptical shape. In addition, since the side joining portions 53a to 53c disposed on one side edge 20c of the mask body 20 and the side joining portions 53a to 53c disposed on the other side edge 20d are disposed almost symmetrically in the side seal region 53, a uniform design is provided.

An elastic band piece (nose attachment portion) 16 extending in the width direction X is arranged between 2 seal lines of the upper seal region 51. The elastic band piece 16 is interposed between the outer layer piece 42 and the upper bent portion 26, and specifically, the elastic band piece 16 is sandwiched and fixed in a cylindrical space formed between 2 seal lines (forming the upper side seal region 52). On the outer sides of both ends of the elastic band piece 16 in the width direction X, joint portions 51b for restricting movement of the elastic band piece 16 in the width direction X are arranged.

The ear loops 30 are formed of various known elastic materials such as nonwoven fabric, woven fabric, plastic film, rubber string, and knitted string, and have a pair of upper and lower fixed ends 31 and 32 positioned at the upper end 21 and the lower end 22 of the mask body 20, and a free portion 33 extending in a loop shape between the upper and lower fixed ends 31 and 32. The upper fixing ends 31 of the ear straps 30 are fixed to the outer surface of the upper end 21 of the mask body 20 via the upper fixing portions 17, and the lower fixing ends 32 are fixed to the outer surface of the lower end 22 of the mask body 20 via the lower fixing portions 18. In the present embodiment, a braided rope having a width of 4 to 8mm is used as the ear portion 30. By using a wide braided cord instead of a rubber cord in this manner, the rubber cord can be gently brought into contact with the ear of the wearer without causing a rubber mark, and the child wearer can be prevented from breaking or losing elasticity even if the child wearer is not used with a seal.

The upper and lower fixing portions 17, 18 are larger than the upper and lower fixing ends 31, 32 of the ear portions 30 by one turn, have a substantially rectangular shape formed by a mesh-like embossed pattern, and the upper and lower fixing ends 31, 32 are bonded or welded to the mask body 20. The upper and lower fixing portions 17, 18 are larger than the upper and lower fixing ends 31, 32 of the ear portion 30, so that the upper and lower fixing ends 31, 32 have a peeling strength necessary for peeling the mask body 20, and are not easily peeled even if a force for peeling the upper and lower fixing ends 31, 32 is applied thereto during wearing.

Further, a part of the upper and lower fixing portions 17 and 18 overlaps with the joint portions 51a and 52a forming the upper and lower side seal regions 51 and 52, and the joint strength is higher at the overlapping portions. The upper and lower fixing ends 31, 32 of the ear hanging part 30 are fixed to the non-skin-facing surface of the mask body 20 by the upper and lower fixing parts 17, 18. By fixing the upper and lower fixed ends 31 and 32, which are both end portions of the free portion 33 of the ear hanging portion 30, to the non-skin-facing surface of the mask body 20 in this manner, the upper and lower fixed ends 31 and 32 function to bring the mask body 20 into contact with the face in the worn state, and the close contact of the mask body 20 with the face can be improved as compared with the case where the upper and lower fixed ends are fixed to the inner surface side of the mask body 20.

The crossing seal portions 67 intermittently extending in the width direction X are arranged above both sides of the lower seal region 52. The crossing seal portion 67 is a seal portion for fixing the upper end edge portion of the lower folded portion 27, and the lower fixed end 32 of the tab portion 30 is attached to the outer surface of the mask body 20 via the lower fixing portion 18 so as to be surrounded by the crossing seal portion 67 and the lower seal region 52 in a region 80 located between the crossing seal portion 67 linearly extending in the width direction X and the lower seal region 52 extending while being bent upward along the lower end edge 20 b. The crossing seal portion 67 is formed by a plurality of joint portions 67a arranged at intervals in the width direction X, and a part of the joint portion 67a and the lower fixing portion 18 overlap each other. By overlapping the joining portion 67a crossing the seal portion 67 and the lower fastening portion 18 with each other in this manner, a portion having higher rigidity is locally formed in the lower fastening portion 18, and the mask body 20 can be more stably brought into contact with the face portion via the lower fastening end 32 of the ear clip portion 30.

Referring to fig. 2 and 3, the oronasal covering portion 23 of the mask body 20 includes a plurality of folds (wrinkles) 60 extending in the width direction X formed by folding a body sheet into a wrinkle shape. The fold 60 includes a 1 st fold 61, a 2 nd fold 62, a 3 rd fold 63, and a 4 th fold 64 arranged in this order from the upper end edge 20a side to the lower end edge 20b side of the mask body 20.

Each of the folds 61 to 64 is folded into a fold shape and is folded in different directions in the upper and lower directions on the outer surface side and the inner surface side of the mask body 20, the 1 st fold 61 has an outer folded portion 61A located on the outer surface side and protruding upward and an inner folded portion 61B located on the inner surface side and protruding downward, the 2 nd fold 62 has an outer folded portion 62A located on the outer surface side and protruding upward and an inner folded portion 62B located on the inner surface side and protruding downward, the 3 rd fold 63 has an outer folded portion 63A located on the outer surface side and protruding downward and an inner folded portion 63B located on the inner surface side and protruding upward, and the 4 th fold 64 has an outer folded portion 64A located on the outer surface side and protruding downward and an inner folded portion 64B located on the inner surface side and protruding upward.

In the present specification, a pleat located above the cross center line Q in the pleat 60 is referred to as an upper pleat, and a pleat located below the cross center line Q is referred to as a lower pleat. In the present embodiment, the 1 st and 2 nd pleats 61, 62 are upper pleats, and the 3 rd and 4 th pleats 63, 64 are lower pleats, but the upper pleats may be 1 or 2 or more pleats, and the lower pleats may be 1 or 2 or more pleats. In the mask body 20 of the present embodiment, the 2 nd fold portion 62 is curved convexly upward and the opposite 3 rd fold portion 63 is curved convexly downward on the outer surface side, and thus a bent region having an Ω -shaped cross section is formed in the center portion of the mask body 20, and a large internal space can be formed when the mask is worn.

In the 1 st to 4 th pleats 61 to 64, the folded state of the main body sheet is maintained in the side seal region 53 and becomes a non-stretching region, whereas the region between the side joining portions 53a to 53c constituting the side seal region 53 becomes a stretching region capable of stretching in the vertical direction. Specifically, the regions between the inner edges of the side joining portions 53a to 53c located closest to the inner side in the width direction X among the side joining portions 53a to 53c of the respective pleats 61 to 64 are extension regions. For example, in the 4 th fold portion 64, the region between the side joining portions 53a located closest to the inner side in the width direction X becomes an expanded region.

Referring to fig. 3, the side joint portions 53A to 53c are not provided with the side joint portions 53A to 53c in the non-folded portion 55, which is the central portion of the main body panel between the 2 nd fold portion 62 and the 3 rd fold portion 63, and the portion 56 between the outer fold portion 63A of the 3 rd fold portion 63 and the inner fold portion 64B of the 4 th fold portion 64. Since the side joint portions 53a to 53c are not disposed in these portions 55 and 56, both side edge portions of the mask body 20 can be bent from these portions 55 and 56 by the rearward tensile force generated by the ear portions 30. By controlling the starting points of the folding of the both side edge portions of the mask body 20 in this manner, the mask body 20 can be made to follow the shape of the wearer's face.

Referring to fig. 2, the mask body 20 is divided into a central region 14 and both side regions 15 located at both sides thereof in the width direction X for convenience of description. The central region 14 has an expansion region of the 1 st fold 61 to the 4 th fold 64, and means a region which can be completely expanded in a worn state. On the other hand, the side regions 15 are regions between the central region 14 and the side edges 20c and 20d of the mask body 20, and refer to regions including the side seal regions 52 where the outer fold portions 61A to 64A do not extend completely in the worn state. In the worn state of the mask 10, the extended region of the fold portion 60 extends in accordance with the longitudinal length of the wearer's face (the length from the nose to the submandibular region) and the longitudinal dimension (the dimension in the vertical direction Y) of the central region 14 of the mask body 20 becomes large, while the outer bent portions 61A to 64A do not extend at all in the both side regions 15, and therefore extend only slightly compared to before wearing.

When wearing the mask 10, the lower end 22 of the mask body 20 is pulled downward after the ear hanging portions 30 are put around the ears, and the plurality of pleats 60 are stretched. At this time, in a state where the upper and lower end portions 21 and 22 of the mask body 20 are brought into contact with the face by the ear portions 30, the 1 st to 4 th fold portions 61 to 64 are pulled downward and the respective stretched regions are stretched, and the vertical dimension of the central region 14 of the mask body 20 is increased.

When the central portion 25 of the lower edge 20b of the mask body 20 extends linearly in the width direction X as indicated by a virtual line K1 shown in fig. 2, the vertical dimension of the central region 14 of the mask body 20 is the same as the vertical dimension of the side regions 15 before wearing. For example, when the wearer is a child and the chin is round and small, when the fold portion 60 of the mask body 20 is stretched, the central portion 25 extending linearly in the width direction X extends downward beyond both side portions thereof, that is, the longitudinal dimension of the central region 14 of the mask body 20 is larger than the longitudinal dimension of both side regions 15, and thus the lower end portion 22 of the mask body 20 may come loose under the jaw and not sufficiently fit to form a gap. In order to eliminate such looseness, the lower end portion 22 may be further pulled to approach the throat, and therefore, particularly for children, there is a fear that the wearer feels uncomfortable.

Referring to fig. 6, in the disposable mask 10 of the present embodiment, the lower end edge 20b of the mask body 20 has the central portion 25 which is bent upward, and thus the vertical dimension of the central region 14 of the mask body 20 before stretching is adjusted to be small, so that the lower end portion 22 does not collapse even when the vertical dimension increases during stretching, and the lower end edge 20b fits under the jaw in a substantially linear state.

In fig. 4, a virtual line K1 and a virtual line K2 are shown by two-dot chain lines in the non-worn state, and the virtual line K2 is a line indicating the side edge 20d of the mask body 20 in the case where the center portion 25 extends linearly in the width direction X along the virtual line K1. When the central portion 25 is linear along the virtual line K1, the lower end portion 22 does not spread laterally because the dimension of the mask body 20 in the width direction X does not change greatly. On the other hand, in the mask 10 of the present embodiment, although the central portion 25 of the lower edge 20b has a shape curved convexly upward in the non-worn state, the stretched region of each fold portion 61 to 64 stretches in the worn state, and the central portion 25 deforms linearly in the width direction X, so that the width dimension of the lower end portion 22 becomes larger than the width dimension of the upper end portion 21 and the mouth-nose covering portion 23. Therefore, the side edges 20d are positioned further outward than the virtual line K2, and the lower end portion 22 can widely cover the vicinity of the chin of the wearer in a laterally expanded state. As described above, it can be said that the lower end portion 22 is appropriately positioned under the jaw of the wearer, and the vicinity of the chin is widely covered in a planar manner, so that the lower end portion 22 can be more stably attached to the face.

Referring to fig. 2, in order to pull down the lower end portion 22 so that the central portion 25 of the lower end edge 20b becomes substantially linear when worn, it is preferable that a part of the central portion 25 be positioned between the lower fixed ends 32 of the ear loops 30. Since a part of the central portion 25 is located between the lower fixed ends 32, the curved portion including the central portion 25 located therebetween can be pulled downward effectively from the lower fixed end 32 in contact with the face portion. Further, it is more preferable that the uppermost portion 25c of the central portion 25 is located lower than the upper edge of the lower fixed end 32 of the ear portion 30. In this case, the curved portion of the lower end portion 22 along the central portion 25 can be reliably deformed linearly by a force that acts rearward and is pulled in the width direction X by the lower fixed end 32 of the ear portion 30.

Further, in the present embodiment, the lower fixing end 32 is located in the region 80 surrounded by the cross seal portion 67 and the lower side seal region 52. Since the lower fixing end 32 does not overlap the cross seal region 67 and the lower seal region 52, the welded and hardened joining portions 52a and 67a do not directly contact the skin and give a sense of discomfort. Further, a part of the lower fixing end 32 may overlap with the joint portion 67a crossing the seal region 67 and/or the joint portion 52a of the lower seal region 52, and even in this case, the joint portions 52a and 67a are independent small elliptical shapes, and therefore, even if they overlap with each other, they are not excessively hardened and give a feeling of discomfort to the skin.

In the present embodiment, the bottom gusset includes a 3 rd gusset 63 and a 4 th gusset 64, and the longitudinal dimension thereof before stretching (the total dimension of the longitudinal dimension of the 3 rd gusset 63 and the longitudinal dimension of the 4 th gusset 64) is 20 to 30 mm. Therefore, the total longitudinal dimension becomes 55 to 65mm by fully extending the extension regions, and the chin of the wearer can be covered. Referring to fig. 5, virtual line K1 is located at a position on the back side toward the throat of the wearer, and may give a sense of discomfort particularly to children, whereas in the present embodiment, central portion 25 has a convex curved shape and central portion 25 extends substantially linearly in the width direction X at an appropriate position under the jaw. Specifically, the central portion 25 is spaced from the lower edge of the mandible by about 15 to 25mm, so that the mandible can be stably covered without giving a feeling of discomfort such as pinching the throat by a part of the lower end portion 22.

The degree of curvature of the central portion 25 of the lower end edge 20b can be adjusted appropriately according to the longitudinal length of the wearer's face, and for example, in the case of an adult mask, the longitudinal length of the face is longer than that of a child, so that it is not necessary to largely adjust the longitudinal dimension of the central region 14 after wearing, and the degree of curvature is smaller than that for a child. Referring again to fig. 2, for example, when the mask 10 is for children and the dimension L3 of the virtual line K1 is 105 to 125mm, the longitudinal dimension of the central portion 25, that is, the vertical dimension R1 between the virtual line K1 connecting both ends 25a, 25b of the central portion 25 and extending linearly in the width direction X and the uppermost portion 52c, is 5 to 15mm, preferably 8 to 15mm, in the case of the mask 10 for children, and 5 to 25mm in the case of the mask 10 including those for children and adults.

Although not shown, a decorative element may be disposed on the outer surface of the mask body 20 so that the wearer can easily distinguish the inner and outer surfaces of the mask 10. The decorative elements can be formed by printing the main body sheet, and for example, animal-like images, various known figures, decorative patterns, designs, characters, symbols, colored portions different from the mask main body, and the like can be suitably used.

< test on wearing level of mask >

The mask of the present embodiment (for children) was used as example 1, the mask having the same configuration as the mask of the present embodiment and extending linearly in the width direction X so that the center portion 25 of the lower edge 20b extends along the virtual line K1 was used as comparative example 1, the mask having substantially the same configuration as comparative example 1 and having a nonwoven fabric sheet fixed to the body sheet so as to wrap the both side edge portions of the mask body was used as comparative example 2, and the following test was performed on the wearing level of the mask (the degree of the contact area with the wearer's face). In the mask of comparative example 2, in order to stably fix the divided nonwoven fabric sheet, a joint portion forming the side seal region was disposed on the entire surface of each fold portion, and no elastic band sheet (nose attachment portion) was disposed on the upper end portion of the mask body.

To explain the sequence of the test method, first, a sample of each mask was put on a doll having a standard child head size, and the doll was removed after fitting the mask to the doll for about 1 minute. Next, a coloring matter (for example, a skin color foundation which is generally used for makeup for women) is applied to a portion of the doll to which the mask is attached (for example, a lower portion of the nose, both eyes, cheek, chin, and submaxillary portion). Next, each sample was put on an appropriate position of the doll for 30 seconds, and the colored matter was transferred to the inner surface side thereof.

Next, the sample with the coloring matter transferred on the inner surface side was taken out from the doll, and placed on a test bed with the inner surface side being the upper side, and a yen coin (mass 0.20g, area 3.14 cm) was placed in the substantially central portion of the inner surface side²). In this state, the sample was photographed from directly above with a digital camera, and a color photograph was printed out from a printer. The weight of the 1 yen coin was measured by cutting out an area a of the coin and the total area of the portion to which the coloring matter was transferred, i.e., a contact area B, from the printed color photograph. The area of a 1 yen coin was defined as 3.14cm²Calculating the contact area B (cm) from the ratio of the weight of the area A to the weight of the contact area B²). The same test was carried out three times for each sample of examples and comparative examples 1 and 2, and the average value was defined as the contact area B (cm) of each mask²)。

As a result of this test, the contact area B of the mask of example was 33.2cm²In comparative example 1, the contact area B was 31.2cm²Comparative example 2 has a contact area B of 19.7cm². In comparative example and comparative example 1, the mask 10 of example had a central portion 25 of the lower edge 20b curved convexly upward,therefore, although the area of the mask 10 of the example before wearing is smaller than that of the mask of comparative example 1, the contact area B of the mask 10 of the example is larger than that of the mask of comparative example 1. This is considered to be because, in the mask of comparative example 1, the pulling force of the ear hook is less likely to be transmitted to the portion facing the chin of the wearer and is lifted from the skin, while, in the mask of the embodiment, the central portion 25 has a shape curved convexly upward, so that the lower end portion 22 comes into contact with the face over a large range, and the longitudinal dimension of the central portion 14 of the mask body 20 is reduced, so that the pulling force of the ear hook 30 is more likely to be transmitted to the entire portion facing the chin, and the contact area with the chin increases.