CN111053310A

CN111053310A - Disposable mask

Info

Publication number: CN111053310A
Application number: CN202010044630.4A
Authority: CN
Inventors: 若杉庆; 柴田彰; 神山龙一
Original assignee: Unicharm Corp
Current assignee: Unicharm Corp
Priority date: 2015-09-04
Filing date: 2016-06-20
Publication date: 2020-04-24
Anticipated expiration: 2036-06-20
Also published as: CN111053310B; JP2017048489A; CN108348018A; WO2017038211A1; JP5937746B1; PH12018550024A1; JP2017048490A; CN108348018B; JP5937748B1; KR20180048781A

Abstract

Provided is a disposable mask in which a gap into which pollen, dust, and the like in the air can enter is not formed between the face and the mask body. In a disposable mask (10), a mask body (20) comprises: upper and lower end edges (20a, 20b), both side edges (20c, 20d), a face abutting part (22) covering the nose and mouth of the wearer, and a chin abutting part (23) protruding downward from the face abutting part (22) in a convex shape. Both ends of the ear hook part (30) are fixed to the upper and lower end edges (20a, 20b) at both side portions of the face contact part (22), and the chin contact part (23) has a high-rigidity region (55) which extends in the width direction (X) along the lower end edge (20b) and has higher rigidity than the other portions.

Description

Disposable mask

The present invention is a divisional application of an invention patent application having an application date of 2016, 6/20, an application number of 201680060093.4 (International application number of PCT/JP2016/068217), and an invention name of "disposable mask".

Technical Field

The present disclosure relates to disposable masks.

Background

Referring to fig. 5 and 6, patent document 1 and patent document 2 disclose

disposable masks

200 and 300, respectively, which include:

mask bodies

220, 320, the

mask bodies

220, 320 having

face abutting portions

222, 322 covering the nose and mouth of a wearer and

chin abutting portions

223, 323 positioned below the

face abutting portions

222, 322; and a pair of

annular ear loops

230, 330, wherein the

ear loops

230, 330 are attached to both sides of the

mask body

220, 320.

Documents of the prior art

Patent document

Patent document 1 Japanese patent laid-open publication No. 2010-279620 (P2010-279620)

Patent document 2 Japanese patent laid-open No. 2007-97904 (P2007-97904)

Disclosure of Invention

Problems to be solved by the invention

In the disposable mask 200 disclosed in patent document 1, both ends of the ear hooking portion 230 are fixed to an upper end portion which is a part of the face abutting portion 222 and a lower end portion which is a part of the chin abutting portion 223.

In the disposable mask 300 disclosed in patent document 2, the ear hanging portions 330 are attached to both side portions of the face contacting portion 322, and the non-sealing regions 340 having a rigidity lower than that of the both side sealing regions 344 are located at the lower end portions thereof, which are located at the chin contacting portion.

Referring to fig. 7(b), in the mask 200 disclosed in patent document 1, since both ends of the ear hooking portions 230 are fixed to the face abutting portion 222 and the chin abutting portion 223 of the mask main body 220, the dimension R4 in the vertical direction Y of the ear hooking portions 230 is larger than the dimension R3 in the vertical direction Y of the ears 80 of the wearer, and there is a possibility that gaps 250 into which pollen, dust, and the like in the air enter are generated without the both side edge portions of the mask main body 220 coming into close contact with the cheeks in the worn state.

Referring to fig. 7(c), in the mask 300 disclosed in patent document 2, since the low rigidity region constituted by the non-sealing region 340 is located in the chin rest portion 323 of the mask body 320, there is a possibility that the chin rest portion 323 is separated so as to float from the chin of the wearer in the worn state, and a gap 350 into which pollen, dust, and the like in the air enter is generated between the chin and the mask body 320.

The present invention is an improvement of a conventional disposable mask, and an object thereof is to provide a disposable mask in which a gap into which pollen, dust, or the like in the air enters is not formed between a face and a mask body.

Means for solving the problems

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.

In the disposable mask of the present invention, the mask body has upper and lower end edges, both side edges, a face abutting portion that covers the nose and mouth of the wearer, and a chin abutting portion that protrudes downward from the face abutting portion in a convex shape, both ends of the ear hooking portion are fixed to the upper and lower end edge sides at both side portions of the face abutting portion, and the chin abutting portion has a high rigidity region that extends in the width direction along the lower end edge and has higher rigidity than other portions.

The upper and lower fixed portions have a vertical dimension of separation of 50 to 70mm, the upper fixed portion fixes one end of the tab portion to the upper edge side of the two side portions of the face abutting portion, and the lower fixed portion fixes the other end of the tab portion to the lower edge side of the two side portions of the face abutting portion.

The upper fixing portion and the lower fixing portion are arranged in the vertical direction, so that: if the 1 st and 2 nd fixing portions are displaced from each other in the vertical direction, the dimension of separation between the lower fixing portions increases due to the pulling force applied to the ear hanging portions, and a gap is formed between the face portion and the mask body.

Since the high-rigidity region is one or more linear depressions extending along the outline of the chin rest portion, the range or the degree of rigidity of the high-rigidity region can be adjusted by controlling the size or the pitch of the linear depressions while suppressing the curling of the arcuate chin rest portion.

The contour line of the chin rest portion has a central portion extending linearly in the width direction and a pair of side curved portions located on both sides of the central portion and extending in a curved shape from the both side edges to the central portion, and the dimension of separation between the lower end of the face rest portion and the central portion in the vertical direction is 8 to 14 mm.

An intersection angle between a 1 st line and a 2 nd line is 10 to 40 degrees, the 1 st line extends in the width direction from a 1 st point located on both sides of the central portion, and the 2 nd line connects the 1 st point and a 2 nd point which is an intersection point of a lower end edge of the ear hook portion and an inner edge of the lower fixing portion, so that a line of the face abutting portion is not too sharp in front view, giving an impression that a wearer's face is longer than an actual length.

The vertical separation dimension between the high-rigidity region and the central portion is 1-5 mm, and therefore, the lower edge positioned below the high-rigidity region can be effectively prevented from rolling up during wearing.

Since the mass per unit area of the piece forming a part of the chin rest portion is larger than the mass per unit area of the piece forming the face rest portion, the chin rest portion stably fits the chin of the wearer, and the chin does not shift in position even when the chin moves up and down together with the lips during speaking.

The face contact portion has a fold portion formed by an overlapping portion formed by folding a sheet, and a non-overlapping portion located between the fold portions in the vertical direction, and the non-overlapping portion is located below a transverse center line that bisects a dimension of the mask body in the vertical direction, so that a force applied to a fixed end portion located below the ear hook portion and a vicinity of the fixed end portion and pulling the fixed portion upward can be absorbed and dispersed, and both side edge portions of the mask body are prevented from being lifted from the face portion and generating a gap.

The correlation between the size of the 1 st dimension, which is the dimension in the width direction between the upper fixing portions of the pair of ear loops, the size of the 2 nd dimension, which is the dimension in the width direction between the lower fixing portions of the pair of ear loops, and the size of the 3 rd dimension, which is the dimension in the width direction of the lower end edge of the lower jaw abutting portion, is 3 rd dimension > 1 st dimension ≈ 2 nd dimension, and therefore the width of the face abutting portion is not wide, and an impression of a sharp small face can be given to the lower jaw abutting portion.

When the 2 nd size is 115-135 mm, the 2 nd size and the 3 rd size are 240-260 mm in total. When the 2 nd size is 140-160 mm, the 2 nd size and the 3 rd size have a total size of 290-310 mm.

And under the condition that the 2 nd size is 115-135 mm, the 3 rd size is 120-140 mm. Under the condition that the 2 nd size is 140-160 mm, the 3 rd size is 145-165 mm.

Since the bending rigidity value of the chin rest portion in the width direction is 0.06 or less, the chin rest portion can be attached along the chin of the wearer.

Effects of the invention

According to the disposable mask of one or more embodiments of the present invention, it is possible to prevent the mask body from separating from the wearer's face and generating a gap into which pollen, dust, or the like in the air enters in the worn state.

Drawings

The drawings illustrate specific embodiments of the present invention, including not only the indispensable structures of the invention, but also alternative and preferred embodiments.

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

Fig. 2 is a perspective view of one side portion of the mask as viewed from the outside, taken along line II-II of fig. 1.

Fig. 3 is a plan view of the mask body.

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

Fig. 5 is a plan view of a conventional disposable mask.

Fig. 6 is a plan view of another conventional disposable mask.

Fig. 7(a) is a view showing a state where the disposable mask of the present invention is worn, viewed obliquely from the rear, fig. 7(b) is a view showing a state where the conventional disposable mask is worn, viewed obliquely from the rear, and fig. 7(c) is a view showing a state where another conventional disposable mask is worn, viewed obliquely from the rear.

Fig. 8 is a front view of the disposable mask in a worn state.

Fig. 9(a) is a plan view of mask 10 of the present invention, and fig. 9(b) is a plan view of conventional mask 400.

Fig. 10(a) is a front view of the mask 10 in a worn state, fig. 10(b) is a side view of the mask 10 in a worn state, fig. 10(c) is a front view of the conventional mask 400 in a worn state, and fig. 10(d) is a side view of the conventional mask 400 in a worn state.

Fig. 11 is a histogram relating to the prior evaluation of the effect of a small face.

Fig. 12 is a graph relating to formal evaluation of the effect of a small face.

Fig. 13 is a plan view of the disposable mask according to an example of the modification as viewed from the front.

Detailed Description

The following embodiments relate to a disposable mask shown in fig. 1 to 13, which includes not only an indispensable structure of the invention but also an alternative and preferable structure.

Referring to fig. 1 to 3, a mask 10, which is an example of a disposable mask of the present invention, has a vertical direction Y and a width direction X, and includes: a skin-facing surface and a non-skin-facing surface facing the skin-facing surface; a cross-sectional centerline Q bisecting the dimension in the up-down direction Y; a mask body 20; and a pair of annular ear portions 30 extending from both

side edges

20c and 20d of the mask body 20.

The mask body 20 is formed of a base sheet 21, and the mask body 20 includes: an upper end edge 20a extending linearly in the width direction X; a lower edge 20b extending slightly downward and convexly in the width direction X; and both

side edges

20c, 20d extending in the vertical direction Y between the upper and

lower end edges

20a, 20 b. The lower end edge (lower end edge of the chin rest portion 23) 20b of the mask body 20 includes: a central portion 19a extending linearly in the width direction X; and a pair of side curved portions (both side portions) 19b, 19c located on both sides of the central portion 19a in the width direction X and extending in a curved shape from both

side edges

20c, 20d to the central portion 19 a. The mask body 20 has both side edge portions 18, and the both side edge portions 18 are located outside the inner edges of the upper and

lower fixing portions

34A and 34B of the ear portions 30 in the width direction X.

Referring to fig. 2 and 3, the mask body 20 is divided into a face abutting part 22 that covers the nose and mouth of the wearer and a chin abutting part 23 that protrudes downward from the face abutting part 22 in a convex shape. In the present specification, the face contact portion 22 means the following region: between the both

side edges

20c, 20d, the region extending from the upper edge 20a to the vicinity of the upper and

lower fixing portions

34A, 34B for fixing the upper and

lower ends

31A, 31B of the ear hanger part 30 in the vertical direction Y preferably means the region extending from the upper edge 20a to the lower edges of the upper and

lower fixing portions

34A, 34B in the vertical direction Y. In the illustrated example, the boundary line M between the face abutment portion 22 and the chin abutment portion 23 extends in the width direction X between the lower end edges of the lower fixing portions 34B in consideration of the size of the mask body 20, the size of the wearer's face, and the like. The mask body 20 further has curved corners 27 where the upper and

lower edges

20a, 20b intersect with the

side edges

20c, 20 d. Since the corner portion 27 is curved and not sharp, the corner portion 27 does not give a stimulus even if it comes into contact with the face of the wearer.

The mask body 20 (mask 10) has a dimension in the vertical direction Y (length dimension of both

side edges

20c, 20d) W1 of 60 to 100mm and a dimension in the width direction X (length dimension of upper and

lower end edges

20a, 20b) L1 of 140 to 180 mm. When the dimension W1 in the vertical direction Y of the mask body 20 is 60mm or less, the chin of a adult wearer of a standard size cannot be sufficiently covered, whereas when the dimension W1 is larger than 100mm, the lower end of the mask body 20 may be separated downward from the chin, giving an impression of being longer than the actual length in front view.

The base sheet 21 forming the mask body 20 includes an inner sheet 25 positioned on the skin-facing surface side and an outer sheet 26 positioned on the non-skin-facing surface side. The inner layer sheet 25 and the outer layer sheet 26 are joined to each other by an outer peripheral seal region (outer peripheral high rigidity region) 40 intermittently extending along the outer peripheral edge of the mask body 20. The outer peripheral seal region 40 is formed by a plurality of joint portions 41, and the plurality of joint portions 41 are arranged so as to be separated by a predetermined dimension in the extending direction of the outer peripheral seal region 40. The outer peripheral seal region 40 has: an upper side sealing region 42 formed by two lines, the upper side sealing region 42 intermittently extending along the upper end edge 20a of the mask body 20 in the width direction X; a lower sealing region 43, the lower sealing region 43 intermittently extending in the width direction X along the lower end edge 20 b; and side seal regions (seal regions) 44, the side seal regions (seal regions) 44 intermittently extending in the vertical direction Y along the side edges 20c, 20 d.

The inner layer sheet 25 and the outer layer sheet 26 are, for example, 10 to 40g/m in mass including heat-fusible fibers²The inner and

outer sheets

25 and 26 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 or a cotton cloth. Although not shown, an intermediate sheet having a filtering function of fine particles or including an antibacterial agent, an aromatic agent, and the like may be interposed between the inner and

outer sheets

25, 26. The ear portion 30 is preferably made of an elastically stretchable material, and is formed of a known material such as a nonwoven fabric, a woven fabric, a plastic film, or a rubber string.

The outer peripheral seal region 40 is a fusion seal line in which the inner layer sheet 25 and the outer layer sheet 26 are fused to each other at a plurality of intermittently arranged joint portions 41, and the two

sheets

25 and 26 are joined only at the outer peripheral seal region 40 and are not joined 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 two

sheets

25, 26 are joined to each other.

Referring to fig. 2, the joint portion 41 of the outer peripheral seal region 40 is a substantially rectangular shape defined by a pair of short sides and a pair of long sides, and the joint portion 41 is arranged so that the long side extends in the width direction X and two seal lines extending in the vertical direction Y are formed in the upper side seal region 42 and the lower side seal region 43. The vertical direction Y separation between the seal lines in the upper seal region 42 is larger than the vertical direction Y separation between the seal lines in the lower seal region 43.

Elastic band pieces (nose portions bonded) 60 extending in the width direction X are arranged between the seal lines of the upper seal region 42. The elastic band piece 60 is interposed between the inner layer sheet 25 and the outer layer sheet 26, and specifically, the elastic band piece 60 is sandwiched and fixed in a cylindrical space formed between two seal lines forming the upper seal region 42. On the outer sides of both ends of the elastic band piece 60 in the width direction, joint portions 41 for restricting the movement of the elastic band piece 60 in the width direction X are arranged.

The upper and lower end edges of the inner layer sheet 25 extend outward in the vertical direction Y than the upper and lower end edges of the outer layer sheet 26, and the upper and lower extending

portions

25a, 25b are bent inward in the vertical direction Y to be curved, and are fixed to the non-facing surface sides of the outer layer sheet 26 by the upper seal region 42 and the lower seal region 43.

The ear hook 30 has a pair of upper and lower ends (both ends) 31A, 31B positioned at the upper and lower ends of the mask body 20, and a free portion 32 extending in a ring shape between the upper and

lower ends

31A, 31B. The upper end 31A is fixed to the upper end edge 20a side of the mask body 20 via an upper fixing portion 34A, and the lower end 31B is fixed to the lower end edge 20B side by a lower fixing portion 34B. The upper and

lower fixing portions

34A, 34B are formed in a rectangular shape having a mesh-like embossed pattern, which is slightly larger than the outer shape of the upper and

lower ends

31A, 31B, and the upper and

lower ends

31A, 31B are welded or bonded to the mask body 20. By making the outer shape of the upper and

lower fixing portions

34A, 34B larger than the outer shape of the upper and

lower ends

31A, 31B, the upper and

lower ends

31A, 31B have a peeling strength necessary for the mask body 20, and even if a force to peel the upper and

lower ends

31A, 31B is applied to the upper and

lower ends

31A, 31B during wearing, the upper and

lower ends

31A, 31B are not easily peeled. Further, a part of the upper and

lower fixing portions

34A, 34B overlaps the joint portion 41 forming the upper and lower

side seal regions

42, 43, and the joint strength is increased at the overlapping portion. The upper and

lower ends

31A, 31B of the ear hook 30 are fixed to the non-skin-facing surface of the mask body 20 by the upper and

lower fixing portions

34A, 34B. By fixing both ends of the free portion 32 to the non-skin-facing surfaces of the mask body 20, both ends of the free portion 32 act to press the mask body 20 against the face in the worn state, and the close contact property of the mask body 20 can be improved.

The face contact portion 22 of the mask body 20 includes a plurality of fold portions 28 extending in the width direction X formed by folding the base sheet 21 into a folded shape. The fold 28 includes, in order from the upper side, 1 st to 3 rd folds 28A to 28C protruding upward on the non-skin-facing surface side of the mask body 20, and a 4 th fold 28D protruding downward below the 3 rd fold 28C. The base sheet 21 is bent into a cross-sectional shape Ω at the 3 rd fold portion 28C and the 4 th fold portion 28D. Therefore, the overlapped portion 29A where the substrate sheet 21 is folded to be laminated with the plurality of substrate sheets 21 and the non-overlapped portion 29B having a single-layer configuration, which non-overlapped portion 29B is located between the 3 rd fold portion 28C and the 4 th fold portion 28D and the substrate sheet 21 is not folded, are located below the transverse center line Q.

Referring to fig. 1 and 3, the chin rest portion 23 of the mask body 20 includes a high rigidity region 55 that extends in the width direction X along the lower end edge 20b and has a rigidity greater than that of the other portions of the chin rest portion 23. In the present embodiment, the high rigidity region 55 is formed by the lower side seal region 43. The chin rest portion 23 has a contour line (contour line of the lower end edge 20b) formed by a central portion 19a extending linearly in the width direction X, and a pair of side curved

portions

19b, 19c located on both sides of the central portion 19a in the width direction X and extending in a curved shape from both

side edges

20c, 20d to the central portion 19 a. The separation dimension W2 in the vertical direction Y between the lower end of the face abutting part 22 (the same as the boundary line M) and the central part 19a (the maximum dimension in the vertical direction Y of the chin abutting part 23) is 8-14 mm. In the present embodiment, the high rigidity region 55 of the chin rest portion 23 is the lower seal region 43 formed of one or more linear depressions extending along the outline, but may have higher rigidity than other portions by locally increasing the mass of the base sheet 21 or attaching a separate sheet member instead of the linear depressions.

In the chin rest portion 23, a vertical direction Y separation dimension R1 between the high rigidity region 55 and the central portion 19a is 1 to 5 mm. The vertical separation dimension between the upper seal region 42 and the upper end edge 20a forming the outer peripheral seal region 40 and the vertical separation dimension between the side seal region 44 and the side edges 20c and 20d in the width direction X are 2 to 7mm, while the vertical separation dimension R1 between the high rigidity region 55 and the central portion 19a is 1 to 5mm, and the lower seal region 43 forming the high rigidity region 55 in the outer peripheral seal region 40 located at the outer peripheral edge portion of the mask body 20 is located closest to the outer peripheral edge of the mask body 20. By providing the outer peripheral seal region 40 with such an arrangement pattern, the lower end edge extending downward from the high rigidity region 55 in the worn state can be effectively prevented from floating.

By fixing the lower extension 25b of the inner layer sheet 25 to the non-skin-facing surface side of the outer layer sheet 26, the laminated portion of the base sheet 21 having a larger mass per unit area than the other portion of the mask body 20 (excluding the portion where the upper extension 25a of the inner layer sheet 25 is disposed) can be positioned at the lower end of the chin rest portion 23. By locating the high rigidity region 55 at the lower end of the chin rest portion 23 so as to overlap with the laminated portion, the rigidity is locally higher, and the chin rest portion 23 more stably abuts against the wearer's chin. In particular, even if the chin moves up and down together with the lips while the wearer speaks, there is no fear that the chin rest portion 23 may be positionally displaced.

Fig. 4 is a side view of the disposable mask 10 in a worn state, fig. 5 is a plan view of a conventional disposable mask (mask described in patent document 1) 200, fig. 6 is a plan view of another conventional disposable mask (disposable mask described in patent document 2) 300, fig. 7(a) is a view of a state in which the disposable mask 10 is worn as viewed obliquely from the rear, fig. 7(b) is a view of a state in which the conventional disposable mask 200 is worn as viewed obliquely from the rear, and fig. 7(c) is a view of a state in which the other conventional disposable mask 300 is worn as viewed obliquely from the rear.

Referring to fig. 7(b), the conventional mask 200 includes: a mask body 220; a pair of annular ear portions 230 extending from both side edges of the mask body 220; a face abutment portion 222 covering the nose and mouth of the wearer; and a chin rest 223 located below the face rest 222 and facing the wearer's chin. In the conventional mask 200, an outer peripheral seal region including upper and lower

side seal regions

242 and 243 and a side seal region 244 is disposed, and the outer shape of the chin rest portion 223 is formed by a central portion 219a extending linearly in the width direction X and curved side curved

portions

219b and 219c located on both sides of the central portion 219 a.

Referring to fig. 7(c), the conventional mask 300 includes: a mask body 320; a pair of annular ear portions 330 extending from both side edges of the mask body 320; a face abutment 322 covering the nose and mouth of the wearer; and a chin abutment portion 323 located below the face abutment portion 322. In the conventional mask 300, both side seal regions 344 located on both side portions of the mask body 320 are arranged, and the outer shape of the chin rest portion 323 is formed by a central portion 319a linearly extending in the width direction X and curved side curved

portions

319b, 319c located on both sides of the central portion 319 a.

In the worn state of the conventional

disposable masks

200 and 300, a force F3 directed from the center portion of the

face contacting portions

222 and 322 that contacts the nose of the wearer to the both side portions and a force F5 drawn downward in the

free portions

232 and 332 of the

ear hanging portions

230 and 330 hung from the ears 80 are generated, and a downward force F1 acts on the

upper fixing portions

234A and 334A of the

ear hanging portions

230 and 330. On the other hand, a force F4 directed from the center portion of the

chin rest portions

223 and 323 that abuts against the wearer's chin toward both side portions and a force F6 that pulls the

free portions

232 and 332 of the

ear portions

230 and 330 upward are generated, and thereby an upward force F2 acts on the

lower fixing portions

234B and 334B of the

ear portions

230 and 330.

In both side edge portions of the

mask bodies

220 and 320 of the conventional

disposable masks

200 and 300, since the force F1 directed downward from the

upper fixing portions

234A and 334A and the force F2 directed upward from the

lower fixing portions

234B and 334B are opposed to each other, both side edge portions may be separated so as to float from the face, and a gap may be generated. In this case, although the deformation can be suppressed if the forces F1 and F2 can be dispersed and absorbed in a part of both side edge portions, the high rigidity regions formed by the both

side seal regions

244 and 344 are located in both side edge portions of the mask

main bodies

220 and 320, and therefore, the forces F1 and F2 cannot be sufficiently absorbed and dispersed and escape.

In the conventional disposable mask 200, the forces F1 and F2 acting on the upper and

lower fixing portions

234A and 234B increase in proportion to the size of the dimension R4 of the separation dimension between the upper and

lower fixing portions

234A and 234B, and here, the upper fixing portion 234A of the ear portion 230 is positioned in the face abutment portion 222 of the mask body 220, and the lower fixing portion 234B is positioned in the chin abutment portion 223, and the separation dimension R4 thereof is relatively large. Specifically, the separation dimension R4 is 70-90 mm. Therefore, the forces F5 and F6 acting on the upper and

lower fixing portions

234A and 234B for pulling are large, and the forces F1 and F2 directed upward and downward are also large, so that both side portions of the mask body 220 are more easily deformed and may be separated from the wearer's face. Further, since the upper and

lower fixing portions

234A, 234B of the ear hooking portions 230 are located on the outer sides in the width direction of the side seal regions 244 in the face contact portion 222, the upward force F2 acts on the outer side edge portions 260 located on the outer sides in the width direction of the side seal regions 244, and the lifting from the face portion is easily generated. Since the lower fixing portions 234B of the ear portions 230 are fixed below the side bent portions 219B and 219c having large bends, the lower fixing portions 234B of the ear portions 230 are positioned inward in the width direction of the upper fixing portions 234A. Since the upper and

lower fixing portions

234A and 234B are not arranged in the vertical direction, the separation dimension R4 is larger than in the case where the upper and

lower fixing portions

234A and 234B are arranged in a row. From the above-described structural problem, it can be said that the gaps 250 into which pollen, dust, and the like in the air are introduced are easily generated between the both side edges of the mask body 20 and the face.

Referring to fig. 6 and 7(c), in the conventional disposable mask 300, the dimension R5 of separation between the upper and

lower fixing portions

334A, 334B of the ear part 330 is not so large as compared with the dimension R3 in the vertical direction Y of the ear 80, and the forces F5, F6 acting on the free portion 332 are not excessively large, but the non-sealing region 340 where there is no sealing region is located in the chin rest portion 323, so that a high rigidity region having higher rigidity than the other portions is not formed in the chin rest portion 323. Therefore, the entire chin rest portion 323 may float from the face during wearing, and a gap 350 into which pollen and dust in the air may enter may be formed between the chin rest portion 323 and the chin.

Referring to fig. 4, in the disposable mask 10 of the present embodiment, as in the case of the conventional

disposable masks

200 and 300, a force F3 directed from the center portion of the face contact portion 22 in contact with the nose of the wearer toward the both side portions and a force F5 pulling the free portions 32 of the ear hanging portions 30 rearward are generated, and a downward force F1 acts on the upper fixing portion 34A. On the other hand, a force F4 that acts from the center portion that abuts against the wearer's chin toward both side portions and a force F6 that acts on the free portions 32 of the ear portions 30 to pull the free portions 32 of the ear portions 30 obliquely upward act on the chin abutting portion 23, and a force F2 that acts toward the upward direction acts on the lower fixing portion 34B.

In the disposable mask 10 of the present embodiment, the upper and

lower fixing portions

34A, 34B of the ear hanging portions 30 are located on both sides of the face contacting portion 22, and the dimension R2 of the upper and lower fixing portions is about 50 to 70mm, and is substantially the same as the dimension R3 in the vertical direction of the ears 80 of the adult wearer. Although the dimension R3 in the vertical direction Y of the ears 80 of the adult wearer varies among individuals, the average dimension is 50 to 70mm, and by setting the dimension R2 within this range, the forces F5 and F6 that pull the free portions 32 of the ear loops 30 in the vertical direction Y extend substantially parallel to the ears 80, and forces acting on the

vertical fixing portions

34A and 34B to deform both side portions of the mask body 20 can be suppressed as compared with the conventional mask 200.

In the disposable mask 10, the high rigidity region 55 is disposed in the chin rest portion 23, so that the chin rest portion 23 does not float away from the chin even when a force to deform the lower fixing portion 34B of the ear portion 30 acts on the lower fixing portion 34B and the vicinity thereof in the worn state. Further, since the dimension R1 in the vertical direction Y of the high rigidity region 55 from the central portion 19a of the lower edge 20b is relatively small, there is no fear that a portion extending downward from the high rigidity region 55 will float. Further, since the upper and

lower fixing portions

34A and 34B of the ear portion 30 are arranged in the vertical direction Y (not displaced in the width direction X), the upper and

lower fixing portions

34A and 34B are not displaced and the separation dimension R2 is increased.

Referring to fig. 7(a), by providing the disposable mask 10 with this structure, the portions on both sides of the face abutting portion 22 and the chin abutting portion 23 are brought into contact with the face of the wearer in the worn state, and there is no fear of a gap through which pollen, dust, or the like in the air enters the interior of the mask 10. In the mask 10, the non-overlapping portion (low rigidity region) 29B having a single-layer structure is disposed below the transverse centerline Q in the face contacting portion 22, and the non-overlapping portion (low rigidity region) 29B is located between the fold portion 28C and the fold portion 28D, which are formed by the overlapping portion (high rigidity region) 29A formed by folding the base sheet 21, whereby the upward force F2 acting on the lower fixing portion 34B can be absorbed and dispersed in the non-overlapping portion 29B. By absorbing and dispersing this force F2 in the non-overlapping portion 29B, deformation of both side portions of the face abutment portion 22 can be suppressed.

Referring again to fig. 3, in the chin rest portion 23 of the mask 10, the intersection angle θ 1 between the 1 st line K1 and the 2 nd line K2 is 10 to 40 degrees, the 1 st line K1 extends in the width direction X from the 1 st point P1 located on both sides of the central portion 19a, and the 2 nd line K2 connects the 1 st point P1 and the 2 nd point P2 which is the intersection point of the lower end edge of the free portion 32 and the inner edge of the lower fixing portion 34B. On the other hand, referring to fig. 5, in the conventional mask 200, the intersection angle θ 2 of the 1 st line K1 and the 2 nd line K2 is about 45 degrees, the 1 st line K1 extends in the width direction from the 1 st point P1 located on both sides of the central portion 219a, and the 2 nd line K2 connects the 1 st point P1 and the 2 nd point P2 which is the intersection of the lower end edge of the free portion 232 and the fixing portion which fixes the lower end edge of the free portion 232. Referring to fig. 6, in the face contact portion 322 of the conventional mask 300, the intersection angle θ 3 between the 1 st line K1 and the 2 nd line K2 is about 25 degrees, the 1 st line K1 extends in the width direction from the 1 st point P1 located on both sides of the central portion 319a, and the 2 nd line K2 connects the 1 st point P1 with the 2 nd point P2 which is the intersection of the lower end edge of the free portion 332 and the fixing portion for fixing the lower end edge of the free portion 332.

Referring to fig. 8, since the chin rest portion 23 has an arc shape that follows the contour of the wearer's chin in the front view of the disposable mask 10 in the worn state, a more smooth tightening (japanese: すっきり) impression can be given compared to the case where the chin rest portion 23 does not follow the contour of the chin. Here, in order to make the chin rest portion 23 and the chin rest portion fit together to give an impression of smooth tightening, the intersection angle θ 1 in the chin rest portion 23 is at least 40 degrees or less, and preferably 35 degrees or less. When the intersection angle θ 2 is 45 degrees or more as in the conventional mask 200, the chin rest portion 23 is too sharp and may give an impression that the wearer's face is longer than the actual face before wearing the mask 10. On the other hand, when the side curved

portions

319b and 319c of the chin rest portion 323 are linear as in the conventional disposable mask 300, the entire chin cannot be covered along the outer shape of the entire chin even if the intersection angle θ 3 is 35 degrees or less. The mask 10 of the present embodiment can give an impression of tightening and smoothening the contour line of the face than the actual contour line of the face by forming a slightly sharp shape in the range from the lower side of the cheek to the chin of the wearer while following the contour line of the chin of the wearer.

As described above, in the mask 10 of the present embodiment, since it is difficult to generate a gap between the mask body 20 and the face, into which pollen, dust, and the like in the air enter, in the worn state, and the intersection angle θ 1 is in the range of 10 to 40 degrees in front view, the both side edges 20c and 20d form a gentle concave curve in the low rigidity region, and the face contacting portion has an appropriate arc shape. Thus, the range from under the cheek to the chin can give an impression of tightening and smoothing the lines of the face than the actual face, and can exert a small face effect that looks smaller than the actual face.

As described above, in the mask 10 of the present embodiment, since it is difficult to generate a gap between the mask body 20 and the face, into which pollen, dust, and the like in the air enter, in the worn state, and the intersection angle θ 1 is in the range of 10 to 40 degrees in front view, the both side edges 20c and 20d form a gentle concave curve in the low rigidity region, and the face contacting portion has an appropriate arc shape. Thus, the range from under the cheek to the chin can give an impression of tightening and smoothness as compared with the actual facial line, and can exert a small face effect that looks smaller than the actual face.

Fig. 9(a) is a plan view of the mask 10 of the present invention, fig. 9(b) is a plan view of the conventional mask 400, fig. 10(a) is a front view of the mask 10 in a worn state, fig. 10(b) is a side view of the mask 10 in a worn state, fig. 10(c) is a front view of the conventional mask 400 in a worn state, and fig. 10(d) is a side view of the conventional mask 400 in a worn state.

Referring to fig. 9(a), in the mask 10 of the present invention, the upper fixing portions 34A and the lower fixing portions 34B are arranged in the vertical direction Y, and therefore, the dot-dash lines (imaginary lines) T1 and T2 passing through the inner edges of the upper and

lower fixing portions

34A and 34B extend in parallel in the vertical direction Y. The correlation between the 1 st dimension N1, which is the dimension in the width direction X between the upper fixing portions 34A of the ear hook 30, the 2 nd dimension N2, which is the dimension in the width direction X between the lower fixing portions 34B of the ear hook 30, and the 3 rd dimension N3, which is the dimension in the width direction X of the lower end edge of the chin rest portion 23, between the dot-dash lines T1 and T2 of the mask 10 is N3 > N1 ≈ N2.

Referring to fig. 9(b), the conventional mask 400 includes a mask body 420, a pair of annular ear portions 430 extending from both side edges 420c and 420d of the mask body 420, a face abutment portion 422 covering the nose and mouth of the wearer, and a chin abutment portion 423 located below the face abutment portion 422 and facing the chin of the wearer. In the conventional mask 400, the upper edge 420a extends linearly in the width direction X, while the lower edge 420b is defined by a linear portion located at the center and inclined portions extending downward toward the linear portion on both sides of the linear portion. In the conventional mask 400, the upper fixing portion 434A and the lower fixing portion 434B of the ear hook 430 are displaced in the vertical direction Y, and therefore, the dot-dash lines (imaginary lines) T1 and T2 on the inner edges of the upper and

lower fixing portions

434A and 434B are inclined toward the center in the width direction X and extend in the intersecting direction. The correlation between the 1 st dimension N4, which is the dimension in the width direction X between the upper fixing portions 434A of the ear hook portions 430, the 2 nd dimension N5, which is the dimension in the width direction X between the lower fixing portions 434B of the ear hook portions 430, and the 3 rd dimension N6, which is the dimension in the width direction X of the lower end edge of the chin rest portion 423, is N4 > N6 > N5 between the dot-dash lines T1 and T2 of the mask 400.

Referring to fig. 10(a) and (B), in the mask 10 of the present invention, since the 1 st dimension N1 between the upper fixing portions 34A of the ear hanging portions 30 and the 2 nd dimension N2 between the lower fixing portions 34B are substantially the same, the forces F5 and F6 pulling rearward in the ear hanging portions 30 are uniformly applied to the both side edge portions 18 of the mask body, and the lifting from the face can be prevented. Further, the size of the 1 st dimension N1 is substantially the same as the size of the 2 nd dimension N2, and the upper and

lower fixing portions

34A and 34B are arranged in the vertical direction Y, so the dimension R5 of the separation between the upper fixing portion 34A and the lower fixing portion 34B is smaller than that in the case where the lower fixing portion 34B is located at a position offset, for example, inside the width direction X of the upper fixing portion 34A. Therefore, the face contact portion 22 between the lower fixing portions 34B is small, and an impression of a small face can be given.

In order to exert such a small face effect when wearing the mask 10, when a female adult is mainly used, the size differs depending on the model, and when the 2 nd size N2 is 115 to 135mm, the total size of the 2 nd size N2 and the 3 rd size N3 is 240 to 260mm, and when the 2 nd size N2 is 140 to 160mm, the total size of the 2 nd size N2 and the 3 rd size N3 is 290 to 310 mm. In addition, the No. 3 size N3 is 120 to 140mm when the No. 2 size N2 is 115 to 135mm, and the No. 3 size N3 is 145 to 165mm when the No. 2 size N2 is 140 to 160 mm. By setting the 2 nd and 3 rd dimensions N2 and N3 within this range, the impression of longer than the actual length can be given without excessively bending downward, and a sharp impression can be given.

As described above, the chin rest portion 23 has an arc shape along the contour of the wearer's chin, and thus has a downwardly convex shape in front view. By providing this feature to the fixing positions of the upper and

lower fixing portions

34A, 34B of the ear hanging portion 30 and the outer contour of the mask body 20, the base 95a of the inverted triangle 95 (line connecting the lower fixing portions 34B) connecting the

lower fixing portions

34B, 34B and the point U1 located at the center of the lower end edge 20B is located at a relatively high position, and the inner angle θ 4 on the point U1 side is relatively small.

Referring to fig. 10(c), in the conventional mask 400, the 1 st dimension N4 between the upper fastening portions 434A of the ear loops 430 is larger than the 2 nd dimension N5 between the lower fastening portions 434B, and the upper and

lower fastening portions

434A and 434B are displaced in the vertical direction Y, so that the separation dimension R6 between the upper fastening portion 434A and the lower fastening portion 434B is larger than the separation dimension of the mask 10. Thus, the face contact portion 422 is long in the vertical direction in the front view mask 400, and may give an impression of being larger than the actual face and protruding in the horizontal direction. Further, since the lower edge 420B of the mask body 420 is not arc-shaped and the 3 rd dimension N6 is smaller than the 1 st dimension N4, the base 495a of the inverted triangle 495 (line connecting the lower fixing portions 34B) connecting the

lower fixing portions

434B, 434B and the point U2 located at the center of the lower edge 420B is located at a relatively low position, and the internal angle θ 5 on the point U2 side is relatively large. Therefore, the lower portion of the conventional mask 400 is wider than the lower portion of the mask 10 in the lateral direction, and the outline of the face as a whole may be given a relatively large impression. In the conventional mask 200, as in the conventional mask 400, the upper fixing portion 234A and the lower fixing portion 234B are displaced in the vertical direction Y, and the separation dimension between the upper fixing portions 234A is larger than the dimension of the lower end edge of the mask body 220, so that there is a possibility that the face may be given an impression wider than the actual width in front view when worn. In addition, in the conventional mask 300, the lower edge is not in the shape of an arc, and therefore, the mask does not have a downwardly convex shape as in the mask 10, and the appearance of the face is not visually sharp.

The bending rigidity value (KES bending rigidity value) of the chin rest 23 of the mask 10 in the width direction X is preferably 0.06gf cm²Less than/cm. When the rigidity value is relatively large, the chin rest portion 23 cannot follow the shape of the wearer's chin, and may be separated by the movement of the chin to form a gap, but the bending rigidity value is set to 0.06g f · cm²The lower jaw abutting portion 23 deforms according to the movement of the lower jaw, and can maintain a state of being attached to the lower jaw.

< evaluation method of Small face Effect >

< method of evaluation in advance >

First, as a material for evaluation, the following was prepared: 540 photographic images of the face of a japanese woman (images taken above the shoulder), a 24-inch liquid crystal display, a head manikin (a model of the face of a 20's old japanese woman with standard dimensions, biosky Doll F-300S, BEAULAX). Next, the pre-evaluator (36 men and women aged 18 years or older) was seated on a chair located 60cm from the screen of the liquid crystal display disposed on the table. An image photograph is displayed on a screen of a liquid crystal display in a predetermined size (a JPEG image of 354 × 472 pixels, 9.8cm in vertical direction × 13.07cm in horizontal direction), and a head phantom is arranged beside the liquid crystal display. The pre-evaluator compares the photographic image a displayed on the screen of the liquid crystal display with the head manikin and evaluates the size of the face of the image photograph in the range of 1 to 100 (the larger the number, the larger the face) as the pre-evaluation value, when the size of the face of the head manikin is 50 (minutes). The pre-evaluator displays the pre-evaluation value by operating a mouse of a personal computer main body connected to a liquid crystal display with one hand and moving a cursor to a figure considered appropriate on a visual analog scale. The evaluation order and the number of evaluation sheets of the image photographs of each evaluator were random.

The previous evaluation values given by the previous evaluators are counted for each photo image, and an average value is calculated. The number of evaluators differs depending on the photographic image, and 18 photographic images were evaluated on average. Fig. 11 is a graph showing a histogram (the vertical axis represents the number of sheets, and the horizontal axis represents the scale of the size of the face viewed) created based on the previous evaluation value, and the distribution has an average value of 51.3, a standard deviation of 7.7, a minimum value of 32.5, and a maximum value of 77.6. A total of 66 photographic images (photographic image a) of 22 photographic images (small faces) in ascending order from the minimum value of the distribution, 22 photographic images (faces of average size) in descending order from the average value, and 22 photographic images (large faces) in descending order from the maximum value were used as images for the following formal evaluation.

< official evaluation method >

A photo image a prepared in advance and a photo image B in which the mask 10 is worn on the face of the photo image a by image editing software are prepared. The formal evaluator (11 men and women over 18 years old, and people different from the prior evaluator) evaluated 66 photo images (33 photo images A, B, respectively) one by one under the same condition as the prior evaluation method to evaluate the size of the face to be seen. In the main evaluation, adjustment is performed so that each main evaluator does not evaluate both the photo image a and the photo image B of the same person. The photo images A, B evaluated by each of the official evaluators were randomly selected. The formal evaluation values obtained by the formal evaluation are counted under six conditions of whether or not the mask 10 (photo image a, photo image B) is worn × the original face size (small face, average face size, large face), and the standard error of the average value and the average value is calculated.

< official evaluation result >

Referring to fig. 12, the average of the formal evaluation values when the mask 10 is not worn is 40.5 for "small face when the mask 10 is not worn", whereas the average of the formal evaluation values when the mask 10 is worn is 33.5. In addition, the average of the formal evaluation values when the mask is not worn is 53.3 for the "face having the average size when the mask is not worn", whereas the average of the formal evaluation values when the mask 10 is worn is 44.8 for the "face having the average size when the mask is not worn", whereas the average of the formal evaluation values when the mask is not worn is 70.6 for the "face having the average size when the mask is not worn", whereas the average of the formal evaluation values when the mask 10 is worn is 63.1, and in both cases, regardless of the size of the face having the mask 10 not worn, the face can be perceived as small when the mask 10 is worn.

Further, after performing two-factor variance analysis on the six conditions on the formal evaluation values obtained by the formal evaluation, statistically significant results were obtained as to whether or not the mask 10 was worn (F (1, 10) ═ 10.40, and p ═ 0.09), and the primary effect of the original face size (F (2, 20) ═ 91.55, and p ═ 0.01). Whether or not the mask 10 is worn is not considered to interact with the original face size. Thus, the following statistical results can be obtained: regardless of the size of the original face, the face on which the mask 10 is worn looks smaller (looks like a small face) than the face on which the mask is not worn.

< modification example >

Fig. 13 is a plan view of the disposable mask 10 according to an example of the modification as viewed from the front. In the present modification, the non-seal region 91 where the joint portion 41 is not disposed is located in the non-overlapping portion (low rigidity region) 29B. By disposing the non-seal region 91 in the non-overlapping portion 29B in this manner, the rigidity of the non-overlapping portion 29B can be made smaller than the rigidity of the overlapping portion 29A located adjacent to and vertically above the non-overlapping portion 29B, and the upward force F2 can be reliably absorbed and dispersed in the non-overlapping portion 29B. Further, the width joining region 92 in which the joining portions 41 are arranged in line in the width direction X is located below the non-seal region 91. By thus positioning the width joining region 92 adjacent to and below the non-overlapping portion 29B, the upward force F2 can be received and dispersed over a wide range in the non-overlapping portion 29B.

In this manner, the non-seal region 91 is a region for assisting the function of the bending guide portion as the low rigidity region. In order to achieve this effect, the dimension in the vertical direction Y of the non-seal region 91 is preferably larger than the separation dimension (pitch) between the plurality of joint portions 41 of the side seal region 44. If the dimension Y in the vertical direction of the non-seal region 91 is equal to or smaller than the dimension between the joint portions 41, the upward force F2 may not be absorbed and dispersed at the separation portion between the joint portions 41 in the side seal region 44 in the non-seal region 91, and the separation portion may be bent, so that the mask body 20 may not be bent into a predetermined shape as a whole.

As for the members constituting the mask 10, any known material commonly used in the art can be used without limitation, except for the materials described in the present specification, unless otherwise specifically mentioned. In addition, the terms "1 st" and "2 nd" are used in the present specification only for distinguishing the same elements, positions, and the like.

Description of the reference numerals

10: disposable masks (mouthpieces); 19 a: a central portion; 19b, 19 c: a side curved portion; 20: a mask body; 20 a: the upper end edge of the mask main body; 20 b: the lower end edge of the mask main body; 20c, 20 d: the side edge of the mask body; 22: a face abutment portion; 23: a chin rest portion; 28A to 28D: a fold portion; 29A: an overlapping portion; 29B: a non-overlapping portion; 30: hanging ear parts; 31A, 31B: the upper end and the lower end of the ear hanging part; 34A, 34B: an upper and lower fixing portion; 40: a peripheral seal area; 43: a lower side sealing area; 41: a joint portion; 55: a high stiffness region; k1: a 1 st line extending in the width direction from 1 st points located on both side edges of the central portion; k2: a 2 nd line connecting the 1 st point and a 2 nd point which is an intersection point of the lower end edge of the free portion and the inner edge of the lower fixing portion; n1: dimension 1 in the width direction between the upper fixing parts of the ear hanging parts; n2: the 2 nd dimension in the width direction between the lower fixing portions of the ear hanging portions; n3: a 3 rd dimension which is a dimension in the width direction of the lower end edge of the chin rest portion; p1: points located on both side edges of the central portion; p2: points located at the upper edges of the two side portions; q: intersecting the center line; r1: a separation dimension in the vertical direction Y between the high-rigidity region and the central portion; w2: a separation dimension from a lower end of the face contact portion to a central portion; x: a width direction; y: up and down direction; θ 1: and (4) an intersection angle.

Claims

1. A disposable mask having a vertical direction and a width direction and including a mask body and a pair of ear hanging portions, the disposable mask being characterized in that,

the mask body has: upper and lower end edges, both side edges, a face abutting part covering the mouth and nose of the wearer, and a chin abutting part protruding downward from the face abutting part in a convex shape,

both ends of the ear hanging part are fixed on the upper and lower end edges at both side parts of the face abutting part,

the chin rest portion has a high rigidity region extending in the width direction along the lower end edge and having a rigidity higher than that of the other portion,

the face contacting portion has a fold portion formed by folding a sheet and a non-overlapping portion located between the fold portions in the up-down direction, the non-overlapping portion is located below a transverse center line that bisects the dimension of the mask body in the up-down direction,

the bending rigidity value of the lower jaw abutting part in the width direction is 0.06gf cm²Less than/cm.

2. The disposable mask of claim 1 wherein,

go up fixed part and lower fixed part the separation size of upper and lower direction is 50 ~ 70mm, it will to go up fixed part the one end of hangers portion is fixed in the both sides part of face butt portion one side of last end edge, lower fixed part will the other end of hangers portion is fixed in the both sides part of face butt portion one side of lower end edge.

3. The disposable mask of claim 1 or 2 wherein,

the upper fixing portion and the lower fixing portion are arranged in the vertical direction.

4. The disposable mask of claim 1 or 2 wherein,

the high rigidity region is one or more linear depressions extending along a contour line of the chin abutment portion.

5. The disposable mask of claim 4 wherein,

the contour line of the chin rest part has a central part linearly extending in the width direction and a pair of side curved parts located on both sides of the central part and extending in a curved shape from the edges to the central part, and the dimension separating the lower end of the face rest part from the central part in the vertical direction is 8-14 mm.

6. The disposable mask of claim 4 wherein,

an intersection angle between a 1 st line and a 2 nd line is 10 to 40 degrees, the 1 st line extends in the width direction from 1 st points located on both sides of the central portion, and the 2 nd line connects the 1 st point and a 2 nd point which is an intersection point of a lower end edge of the ear hook portion and an inner edge of the lower fixing portion.

7. The disposable mask of claim 1 or 2 wherein,

the separation dimension between the high-rigidity area and the central part in the vertical direction is 1-5 mm.

8. The disposable mask of claim 1 or 2 wherein,

the mass per unit area of a sheet forming a part of the chin abutting portion is larger than the mass per unit area of a sheet forming the face abutting portion.

9. The disposable mask of claim 2 wherein,

a correlation between the size of the 1 st dimension, which is the dimension in the width direction between the upper fixing portions of the pair of ear portions, the size of the 2 nd dimension, which is the dimension in the width direction between the lower fixing portions of the pair of ear portions, and the size of the 3 rd dimension, which is the dimension in the width direction of the lower end edge of the lower jaw abutting portion, is 3 rd dimension > 1 st dimension ≈ 2 nd dimension.

10. The disposable mask of claim 9 wherein,

the sum of the 2 nd size and the 3 rd size is 240-260 mm when the 2 nd size is 115-135 mm, and the sum of the 2 nd size and the 3 rd size is 290-310 mm when the 2 nd size is 140-160 mm.

11. The disposable mask of claim 9 wherein,

under the condition that the 2 nd size is 115-135 mm, the 3 rd size is 120-140 mm, and under the condition that the 2 nd size is 140-160 mm, the 3 rd size is 145-165 mm.