JP6894218B2 - mask - Google Patents

Description

The present invention relates to a mask suitable for use in preventing various infectious diseases, and relates to a mask capable of preventing the wearer's respiration, particularly the inhalation of outside air from being mixed.

In recent years, due to the diversification of social life, domestic and foreign traffic has become active, and with the rapid changes in climate, interest in various infectious diseases such as influenza has increased. The epidemic of infectious diseases, which are substantially poor in early immunity acquisition, is on the rise, and the habit of wearing masks for prevention is becoming established, not limited to already infected patients. A wide variety of mask forms have been proposed. Gauze and non-woven fabric are often used as face bodies to cover the eyes and mouth, and multiple pleats that can be expanded in the vertical direction of the face are provided to increase the filtration area of the face. It is known that a rubber cord or the like is attached in the left-right direction, and an ear hook made of, for example, a stretchable non-woven fabric is provided on both sides of the face body so that the face can be folded in half along the axis of symmetry in the left-right direction.

Now that the habit of wearing masks has become established, ingenuity has been made to improve the problems caused by wearing masks in daily life. As an example, Japanese Patent Application Laid-Open No. 2007-61585 (Patent Document 1) exemplifies a form in which an ear strap is attached to a mask body, and proposes a technique for improving the convenience of a wearer wearing glasses. .. In this literature technique, a mask has a shape in which a string-shaped ear hook is attached to a breathable mask body (hereinafter referred to as a facet in the present specification), and the inside of the facet is thin and airtight. Or, we are proposing a configuration with flakes made of a material that is difficult to pass through. In addition, this thin section has only the upper edge fixed to the facet, and the vertical width and the horizontal width are set to be less than the full width of the mask so that the lower edge does not completely block the nostrils, and from the lower edge to the upper edge of the thin section. There is a description that multiple cuts will be made toward it. When the mask is worn, the flakes adhere to the back of the nose (hereinafter, may be referred to as the bridge of the nose) to prevent leakage of exhaled breath (hereinafter, referred to as exhaust), and this cut prevents the leakage of exhaled air (hereinafter, referred to as exhaust) of the glasses. It is disclosed that fogging can be prevented.

Further, as in Patent Document 1, in addition to a form called a gauze mask or a pleated mask having a flat face body, a "folded mask" or a "three-dimensional mask" used by spreading the face in the left-right direction is used. Masks in the so-called form are also widespread. As an example thereof, Japanese Patent Application Laid-Open No. 2001-245998 (Patent Document 2) describes a mask including a face body (covering part) for the wearer's mouth and an ear hook part extending rearward from both opposite sides of the face piece. A configuration is disclosed in which the ear hook portion is made of an elastic stretchable composite sheet in which an stretchable layer made of stretchable fibers and an elastic layer having elastic stretchability are laminated and integrated. Nonwoven fabrics, woven fabrics, amorphous fiber webs, etc. using thermoplastic synthetic resin elastomers and urethane elastic threads, or films are exemplified as the elastic layers constituting the ear hooks, and polyethylene, polypropylene, etc. are used as the stretchable layers. It is bonded to the above-mentioned elastic layer in the form of a non-woven fabric made of a thermoplastic synthetic resin, a woven fabric, an amorphous fiber web, or the like. It is described that this technique allows the mask wearer to adjust the length of the ear hook, and can realize a mask having an excellent wearing feeling. In this form of mask, since the facet can be folded around the direction from the base of the nose to the mouth, it is possible to prevent the above-mentioned fogging of the glasses even when the so-called nose metal is not provided. It is possible.

In this way, various forms of masks have been proposed, and in addition to the comfort of the wearer, the filtration function, which is the original mask performance, has been pursued. As an example, in Japanese Patent Application Laid-Open No. 2015-217142 (Patent Document 3), it is composed of a non-woven fabric, at least a face body (covering portion) covering the mouth, both ends of the face body, and fixed to the upper and lower ends. A leak-preventing part having a pair of ear hooks and having a strip-shaped body whose one side is fixed to the above-mentioned face body so as to extend from both ends on the wearer side of the face body toward the center. A mask having a provided configuration has been proposed. As a specific embodiment, the facet is pleated, and the leakage prevention portion has a structure in which a band-shaped non-woven fabric that roughly corresponds to the vertical dimension of the facet is folded back, and the above-mentioned pleated shape is fixed and the wearer's shape is fixed. A configuration is disclosed in which the left and right ends in contact with the cheeks are fixed. This leak prevention part has a structure like a pocket having an opening in the central part of the face body at each of the left and right ends of the face body, and realizes a three-dimensional mask shape in cooperation with the pleated shape of the face body. There is. By adopting such a configuration, the leak prevention part has a function like a face-contact body attached to the face body, and is flexible by using a non-woven fabric having a ^{texture of about 30 to 40 g / m 2, for example, on the left and right sides of the face body.} It is described that the mask and the cheek can be brought into close contact with each other because the structure is such that the side welding portion is provided at the end so that the leakage prevention portion extends toward the center of the face piece to impart rigidity to the portion.

Japanese Unexamined Patent Publication No. 2007-61585 ([Claims], [0018], [Fig. 1], etc.) JP 2001-245998 ([Claims], [0014], [Fig. 1], [Fig. 2], etc. Japanese Unexamined Patent Publication No. 2015-217142 ([Claims], [0007], [0029] to [0042], [Fig. 2], etc.)

As can be understood from the background technique described above, in order to deal with leakage occurring at the periphery of the face piece, various components are arranged at the upper and lower ends of the face piece or near the left and right ends, and the mask adheres to the wearer. It has been devised so that it can be enhanced and a more effective mask function can be realized. In particular, Patent Document 3 exemplifies a pleated mask similar to Patent Document 1, in which a band-shaped leakage prevention portion is attached to a face body so that the face body becomes bag-shaped or box-shaped when attached to improve adhesion. It can be seen that it is an effective technology. However, the mask to which the technique of Patent Document 3 is applied requires a complicated process of attaching a leak prevention portion to the face piece and attaching an ear hook portion using a rubber cord or the like, which requires advanced processing technology. There is a problem. In addition, the structural advantage of the technique is that it adheres to the wearer's cheeks, but no specific verification has been made when using the mask.

Further, in the two-fold mask represented by Patent Document 2, the inner and outer edges (hereinafter, simply referred to as "fold lines" in the present specification), which are the axes of left-right symmetry of the mask, also function as a nose metal, and the wearer. The shape can be along the bridge of the nose, and at least upward exhaust leakage can be reduced. Further, in this form of mask, both the face piece and the ear hook portion can be made of a material such as a non-woven fabric, which is effective in preventing fogging of the glasses and is easy to process. However, in order to attach both the ear hook portion and the "leakage prevention portion" proposed in Patent Document 3 to the positions corresponding to the left and right ends of the face piece, advanced processing technology is still required, and at the time of inhalation. There is a problem that it is difficult to deal with the mixing of outside air.

The inventor according to the present application verifies the various problems described above, prevents the wearer from mixing with outside air during inspiration by improving the adhesion to the cheeks according to Patent Document 3, and is excellent like a double-folded mask. The present invention has been completed as a result of intensive studies in order to realize good workability and reduction of fogging of eyeglasses. Therefore, an object of the present invention is to realize and provide a mask having a simple structure and excellent workability, and capable of improving the function of preventing outside air from entering the intake air when the mask is worn.

In order to achieve this object, according to the configuration of the present invention, in order to cover the mouth from the nose bridge of the wearer, a face body folded in two by a fold line and ear hooks attached to both ends of the face body are provided. In a mask having an ear hook hole provided in the ear hook portion, the air permeability of the ear hook portion corresponding to the cheek contact region from the end portion of the ear hook hole on the face body side to the face body described above is described above. It is characterized by being low compared to the air permeability of the face piece.

Further, in carrying out the present invention, it is preferable that the rigidity of the ear hook portion corresponding to the above-mentioned cheek contact region is made lower than the rigidity of the above-mentioned face body.

By applying the configuration of the present invention, it has a simple structure that only appropriately selects the air permeability between the ear hook and the face piece, is highly workable, and has a function to prevent outside air from entering from the ear hook during intake. It is to realize and provide a mask that can improve the above.

In order to explain a preferable example of this invention, it is explanatory drawing which shows the shape at the time of wearing a mask perspectively. As a preferable example of the present invention, it is explanatory drawing which shows the mask shown in FIG. 1 in a folded state. It is explanatory drawing which shows in the same manner as FIG. 2 in order to explain a suitable other example of this invention.

Hereinafter, preferred embodiments of the invention according to the present application will be described with reference to the drawings. FIG. 1 is an explanatory view perspectively showing a state in which the two-fold mask can be attached. The illustrated mask 11 constitutes a cup-shaped face piece 13 by joining pieces of cloth that are symmetrical in the left-right direction when worn. In the illustrated example, by providing the fused portions 15a and 15b at predetermined portions of the face piece 13 in the vertical direction shown in the drawing, continuous ridge-shaped folded lines 17 are defined between the fused portions. Ear hooks 21 provided with ear hook holes 19 are attached to both ends of the face piece 13 in the left-right direction in the drawing by joints 23.

The above-mentioned face piece 13 can be prepared by a technique such as a well-known point sealing process or a hot melt spray method in which a conventionally known filter medium and a cover material laminated on the filter medium 13 are less likely to impair air permeability. Further, when joining the fused portions 15a, 15b or the bonded portion 23 by a heat sealing technique including so-called ultrasonic fusion, it is preferable to use these materials as a non-woven fabric. As a filter medium constituting such a face piece 13, the present applicant has patented No. 4659232 for a triboelectric non-woven fabric capable of realizing low pressure loss and high efficiency, or Japanese Patent Application No. 2016 in which a moisture absorption and heat generation function is added to the triboelectric non-woven fabric. No. -4218 has been proposed, and it is preferable to use a non-woven fabric according to the technique. Further, as the cover material, it is preferable to laminate a conventionally used material such as a spunbonded non-woven fabric or a spunlaced non-woven fabric made of a thermoplastic synthetic resin such as polyolefin or polypropylene on both surfaces of the filter medium.

Further, in constructing the ear hook portion 21 described above, a conventionally used thermoplastic resin such as polyolefin, polyethylene, polyester, or polyurethane is processed into a stretchable sheet such as a non-woven fabric, a woven fabric, or a film. be able to. In particular, in order to impart elasticity, crimps made of overt crimp fibers or the elastomer of the above thermoplastic resin may be used. Further, in order to facilitate the mounting operation, these materials are laminated and composited by the above-mentioned known method, and similarly to the contents of the above-mentioned Patent Document 2, the strength that can withstand processing or wearing is imparted, and the elasticity is adjusted. You may.

Further, in the invention according to the present application, the air permeability in the cheek contact region A (described later) from the end portion of the ear hook hole 19 on the face body side to the face body 13 of the ear hook portion 21 is compared with the air permeability in the face body 13. It needs to be low. This air permeability is a measurement result by a Frazier type tester specified in JIS L 1096 "General textile test method", etc., and when the above-mentioned technique of Patent No. 4659232 is used, the air permeability of the face piece 13 is ^{It is preferably 300 cc / cm 2} / s or less in order to satisfy the comfort of the wearer, ^{and 15 cc / cm 2} / s or more in order to satisfy the collection performance as a face piece. Therefore, the material constituting the ear hook portion 21 is preferably 95% or less of the air permeability of the face piece. Due to the difference in the relative air permeability between the face and the ear hook, the cheek contact area A, which is a part of the ear hook, has the effect of sticking to the cheek when the wearer inhales. The larger the difference in air permeability, the greater the effect.

Further, in carrying out the present invention, it is preferable that the rigidity of the ear hook portion 21 before mounting is lower than the rigidity of the face body described above. It is preferable to construct the face piece 13 with the filter medium proposed by the applicant as described above, and for example, the rigidity and softness by the 45 ° cantilever method specified in JIS L 1096 "General textile test method" (hereinafter referred to as "rigidity"). By setting the length (sometimes referred to as) to 5 cm or more and 18 cm or less, it is possible to wear the product comfortably and suppress the change in the shape of the face piece due to inspiration. On the other hand, the rigidity of the ear hook portion 21 before wearing is preferably 95% or less of the rigidity and softness of the face piece, which is preferable for handling during wearing. Furthermore, by satisfying both the air permeability and the rigidity as the numerical conditions of the face body and the ear hook portion described above, good adhesion can be realized after wearing the mask, especially when inhaling, and an extremely low leakage rate is realized. It becomes possible.

Next, with reference to FIG. 2, the morphology and the action and effect of the ear hook portion 21 will be mainly described in detail. FIG. 2 is an explanatory view showing the shape of the mask shown in FIG. 1 before mounting in a plane in a state of being folded in two by the fold line 17. Although some reference numerals are omitted, the same components as those in FIG. 1 are designated by the same reference numerals. As described above, the mask of the present invention is composed of the face piece 13 and the ear hook portion 21. These components are bonded and fixed at a joint portion 23 which is substantially strip-shaped so as to overlap each other. At the time of actual wearing, the ends of the two overlapping ear hooks 21 are pulled, and the portions are stretched to insert the wearer's ear into the ear hook hole 19. After that, the relative position between the mask and the face is determined with the wearer's ears in the ear hook holes, and the extended dimension of the ear hook portion 21 is restored to complete the wearing. During this time, the end portion of the ear hook portion can be easily picked by setting the rigidity of the ear hook portion 21 within the above-mentioned preferable range at the time of wearing.

Focusing on the relationship between the cheek contact area A and the ear contact area B with the three alternate long and short dash lines in FIG. 2 during the series of wearing operations, the ear contact area B including the side end portion of the ear hook portion 21 is usually taken into consideration. Since the wearer picks and pulls the ear contact area B, the dimensional change is relatively large in the ear contact area B, and the dimensional change is small as it approaches the joint portion 23 side of the cheek contact area A. According to the result of the examination of the standard wearing state conducted by the present inventor, the dimensional change of the cheek contact area A is substantially in front of the wearer's ear (face body side), although it depends on the face size of the wearer. The extension is negligible. In order to perform this verification, when a "test human head" (hereinafter, may be referred to as a man head) specified in JIS T 8151 and used for a nationally certified dust mask is used, the joint portion 23 constitutes a face body 13. Since the material and the material constituting the ear hook portion 21 are thermally fixed, even if the side end of the ear hook portion 21 on the ear contact portion side is pinched and pulled, the cheek contact region A including the joint portion 23 Substantial dimensional changes were not observed.

In the present invention, since the air permeability of the ear hook portion 21 corresponding to the cheek contact area A after the above-mentioned wearing operation is lower than the air permeability of the face body 13, when the wearer takes in air through the face body 13, the face body The ear hook portion 21 of the cheek contact area A is configured to be in close contact with the cheek first before it comes into close contact with the face. The numerical relationship between these two air permeability is as described above, but as long as the basic performance such as intake resistance as a mask is satisfied, the magnitude relationship between them must be relatively satisfied in order to achieve such an action effect. Just do it. Further, as described above, since the ear hook portion 21 in the cheek contact region A does not substantially stretch, the air permeability of the constituent material itself can be maintained even after wearing. At this time, since the joint portion 23 is joined in a state where the materials of both the face piece and the ear hook portion are overlapped, the air permeability is the lowest among the masks and the rigidity is the highest component, and the mask. It can contribute to the overall shape retention.

Hereinafter, other embodiments of the present invention will be described with reference to FIG. FIG. 3 is an explanatory view showing the same as FIG. 2, but in the form of FIG. 3, the joint portion 23 in FIG. 2 is configured as a wider joint portion 23'. This is because the region where the face piece 13 and the ear hook portion 21 overlap is widely taken as the region leading to the ear hook hole 19, so that the texture of the joint portion 23'is hardened, but the two materials are overlapped. It is joined with. Therefore, if the rigidity is relatively low enough to exhibit the followability in consideration of the close contact with the cheek, the air permeability of the joint portion 23'that does not contribute to the ease of breathing can be effectively reduced over a wide range. There are advantages that can be.

As described above, specific shapes, arrangement relationships, numerical conditions, etc. have been exemplified as preferred embodiments of the present invention in order to facilitate their understanding, but these are merely examples and are arbitrarily suitable within the scope of the object of the present invention. Can be changed or transformed into.

Hereinafter, as an example of the present invention, an evaluation sample will be prototyped in the shape of the mask illustrated in FIG. 2, and the results of the examination will be described.

(Preparation of filter media for facepiece)
As the face piece in this example, the laminated non-woven fabric prepared by the following procedure was used in a unified manner. First, commercially available rayon short fibers [fineness 1.7 decitex, fiber length 40 mm, weight composition ratio 55%], rayon short fibers [fineness 1.6 decitex, fiber length 44 mm, weight composition ratio 15%], polyester short fibers [ Fineness 1.5 decitex, fiber length 38 mm, weight composition ratio 20%], polyolefin short fibers [fineness 1.7 decitex, fiber length 51 mm, weight composition ratio 10%] are applied to a card machine, and then water flow entanglement at a water pressure of 9 MPa. Then, a half mat having a grain size of 30 g / m ² and an apparent density of 0.08 g / cm ^{3 was obtained.} Then, also by a carding machine, ^{a triboelectric fiber of about 65 g / m 2} (commercially available polypropylene short fiber [fineness 2.2 decitex, fiber length 51 mm, weight composition ratio 40%]] and a commercially available acrylic short fiber [fineness 2.2]. A fiber layer composed of decitex, fiber length 51 mm, weight composition ratio 60%]) was laminated on the above-mentioned half mat to obtain a web. Subsequently, a crossbarb needle having a needle count of 40 is subjected to needle punching under the conditions of a needle ^{depth of 13 mm and a needle density of 34 / cm 2} from the fiber layer side of the web made of triboelectric fibers to form a face piece 13. It was used as a filter medium.

(Manufacturing of octahedron and evaluation of characteristics)
Next, as the surface material of this filter medium (corresponding to the outer layer of the face piece), a short fiber having a core-sheath structure made of commercially available polypropylene short fiber [fineness 2.2 decitex, fiber length 51 mm, weight composition ratio 64%] and polypropylene / polyethylene. After applying [fineness 3.3 decitex, fiber length 64 mm, weight composition ratio 36%] to a card machine, water flow entanglement was performed at a water pressure of 9 MPa to obtain a grain size of 50 g / m ² . ^{A spunbonded non-woven fabric (with a grain of 30 g / m 2} ) made of a commercially available polypropylene / polyethylene core-sheath type composite fiber was arranged as a surface material (corresponding to the inner layer of the face piece) on the downstream side at the time of intake on the other side. The air permeability of this face piece on a flat plate was measured with a Frazier type tester and found to be 150 cc / cm ² / s. Moreover, as a result of measuring the rigidity of this face piece by the 45 ° cantilever method, it was 15 cm. In the mask verified in this example, this facet was used in a unified manner for all the samples.

(Preparation of each material for ear hook)
First, as the material a for the ear hook according to the first embodiment, a melt-blown non-woven fabric made of polyurethane resin (with a grain of 20 g / m ² ) and a short polyester fiber spunlace non-woven fabric (with a grain of 30 g / m ² ) are point-sealed. (Circular shape with a diameter of 1 mm, seal density 16 pieces / cm ² ) were used for bonding. Further, for the material b according to the second embodiment, a commercially available double-sided tape "Proself general purpose double-sided tape S" (manufactured by Nitoms Co., Ltd., trade name) is attached to the portion corresponding to the cheek contact area A of the material a described above. Only the sticking part was made non-breathable without causing a substantial change in the rigidity of the material. Further, in Comparative Example 1, a needle having a diameter of 1 mm was used only in the cheek contact region A of the material a described above to make a ^{needle hole at a needle density of 1 piece / cm 2} , and a highly breathable material c was used. As the material d of Comparative Example 2, a cloth tape "cloth tape" (sold by ASKUL Corporation, trade name) was attached to the cheek contact area A of the material a to make it non-breathable and highly rigid. The manufacturing method and structure will be described later, but as a reference example, a strip-shaped member made of the material a is joined as a constituent component extending from the joint to the face piece, and a portion similar to the "leakage prevention portion" of Patent Document 1 described above. Was arranged. At this time, the same material a as in Example 1 was used as the constituent material of the ear hook portion.

(Preparation of mask sample)
The above-mentioned various facets and materials were combined to form a mask shape. Specifically, the prepared filter media for the face piece, the surface material, and the like are stacked and folded in half, and two materials for the ear hooks (described above) are sandwiched between them by a dimension corresponding to the width of the joint portion 23 described above. In this state, welding was performed by an ultrasonic welding machine, and the welding portions 15a and 15b and the bonding portion 23 were formed at the same time. Further, each mask sample was obtained by cutting with a punching die having an ear hook hole and an approximate shape of the mask. The dimensions and shape of the produced mask are such that the height of the joint between the facet and the ear hook is 6.0 cm, and the distance to the unjoined ear hook hole in the cheek contact area A is 1.5 cm. It was designed in a unified manner. The height of this joint is a numerical condition selected as the standard ear height.

(Evaluation measurement of mask sample)
Table 1 shows the evaluation measurement results and configurations of these facepieces and flat plates of each material such as air permeability and rigidity. In Table 1, the ear hook portion 21 shown in FIG. 2 is divided into a cheek contact area A and an ear contact area B, the material composition of each is shown, and the ear contact area B is picked to be attached to a predetermined length. The air permeability and rigidity were evaluated and measured in a state where the shape was restored after being stretched to. This predetermined length is an extension dimension required when the ear hook is attached to the man head, and is extended by 25 mm with respect to the actual size of the ear hook portion of 75 mm, and is uniformly extended to 100 mm. Furthermore, the leakage rate of each mask attached to this man head was measured with "Labor Lab Mask Fitting Tester M-03" (manufactured by Shibata Chemical Co., Ltd., trade name). With this measuring device, the number of atmospheric dust inside and outside the mask was monitored, the number ratio of atmospheric dust was calculated, and the leakage rate was calculated as a percentage. Therefore, if the outside air containing air dust passes through the mask surface layer and flows into the mask, the target particles are filtered by the surface layer, so that the particles inside the mask are measured less than the particles of the outside air, while the mask. When outside air is mixed in through the gap between the mask and the face, the number of particles in the mask increases. Therefore, the smaller the leakage rate, the higher the airtightness between the mask and the face. For the "leakage rate", a value calculated by the following formula was used.
Leakage rate (%) = (Pi / Po) x 100
[In the formula, Pi is the number of target particles in the mask, and Po is the number of target particles outside the mask]
All of these measurements were carried out three times and calculated as the average value. The measurement order was the measurement of the leakage rate, the air permeability measurement of each region with the man head removed, and the rigidity measurement.

From Table 1, a comparison between Example 1 to which the configuration of the present invention is applied and Comparative Example 1 in which the ear hook portion is made of the same material except that the air permeability of the cheek contact region A is intentionally increased is compared. , The phenomenon that the leakage rate increases in the configuration of Comparative Example 1 can be seen. Further, in the comparison between Example 2 and Comparative Example 2, the air permeability of the cheek contact region is lost, but the rigidity of the cheek contact region belonging to the ear hook portion is higher than the rigidity of the face piece. It can be understood that this increases the leakage rate. From these two results, by satisfying the two requirements of "the air permeability of the ear material is relatively low with respect to the face body" and "the rigidity of the ear material is relatively low with respect to the face body". It can be understood that the effect of reducing the leakage rate becomes greater.
Further, as a reference example, as described above, the technique of Patent Document 3 described above was applied to the mask of Comparative Example 1. First, the material a used for the ear hook was folded in half to prepare a strip-shaped member having a width of 1 cm and a length of 6 cm. Next, the strip-shaped member was attached at the time of joining so that the folding line of the strip-shaped member faced the face body side, and a "leakage prevention portion" was provided. However, its production requires a high degree of processing, and the effect of reducing the leakage rate as in the examples to which the configuration of the present invention is applied cannot be obtained.
The structure of the ear hook portion 21 corresponding to the ear contact area B changes due to the dimensional change when the mask is attached and detached, but the air permeability is higher and the rigidity is lower in all measurement targets than the initial value of the material. I was able to confirm a very slight effect. On the other hand, in the cheek contact area A, there was no effect on the measurement result due to the desorption.

11: Mask, 13: Octahedron, 15a, 15b: Fused part, 23: Joint part, 17: Folded line,
19: Ear hook hole, 21 ear hook, 23, 23': Joint,
A: cheek contact area, B: ear contact area.

Claims (1)

In a mask having an ear hook that is folded in two by a fold line, ear hooks attached to both ends of the face, and ear hook holes provided in the ear hook to cover the wearer's nose bridge to the mouth. The mask contains a friction-charged non-woven fabric or a filter medium obtained by adding a moisture-absorbing and heat-generating function to the friction-charged non-woven fabric, and ventilates the ear hook portion corresponding to the cheek contact region from the end of the ear hook hole on the face body side to the face body. A mask characterized in that the degree is lower than the air permeability of the face body and the rigidity of the ear hook portion corresponding to the cheek contact region is lower than the rigidity of the face body (however, on the lower part of the face body). ^{A mask provided with a seat member having a air permeability of 2 cm 3} / (cm ² · s) or less according to the Frazier method, and having a lower pocket portion forming a space for accommodating the tip of the lower jaw of the wearer. except for).

Images