JP2005034618A - Mask - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mask which has excellent comfortableness in use and superior effect of removing hazardous micro-materials such as bacteria, viruses and pollen. <P>SOLUTION: This mask has a surface fabric and a lining fabric. At lest a part of the lining fabric is formed of multi-layered thread comprising two or more fiber layers. The lining fabric preferably has at least one layer comprising knitting formed by knitting the multi-layered thread. The multi-layered thread preferably is a double-layered structure thread which has a core part comprising polyester fiber and a sheath part comprising cotton fiber. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a mask, and more particularly to a mask that prevents minute harmful substances such as bacteria, viruses, and pollen in the air from entering the body.

A cotton gauze mask has been generally used for a long time, but relatively large particles can be collected by the gauze mask, but it has been difficult to collect minute harmful substances such as bacteria, viruses and pollen in the air. Even if a mask made of many gauze layers was used, the collection performance was not improved so much, but rather the bad effect of worsening the air permeability and impairing the comfort.
On the other hand, there is a mask using a synthetic fiber nonwoven fabric or the like. Such a mask has a high collection performance of fine particles, and in particular, there are masks that can collect fine particles of 1 μm or less such as bacteria and viruses. However, if the collection performance is high, the air permeability decreases. A conventional mask using a synthetic fiber nonwoven fabric has a strong feeling of stuffiness due to moisture such as exhalation, and has poor comfort during use.

  Accordingly, an object of the present invention is to provide a mask that is excellent in comfort during use and excellent in the effect of removing minute harmful substances such as bacteria, viruses and pollen.

  As a result of intensive studies in order to achieve the above object, the present inventors have used a member composed of a multilayer structure yarn composed of two or more fiber layers for the backing of the mask. The present invention has been completed by obtaining the knowledge that a mask with excellent divergence and comfort can be produced.

  That is, the present invention has been made based on the above knowledge, and the mask of the present invention is a mask having a surface portion and a lining portion, and at least a part of the lining portion has two or more layers of fibers. It is formed from a multi-layer structured yarn composed of layers.

The backing portion preferably has at least one layer made of a knitted fabric formed by knitting the multilayer structured yarn.
The multilayer structured yarn is preferably a structured yarn having a two-layer structure in which the core portion is made of polyester fiber and the sheath portion is made of cotton fiber.
Moreover, it is preferable that the said knitted fabric is antibacterial processed.
The air permeability of the knitted fabric is a value measured based on Japanese Industrial Standards JIS-L-1096 General Textile Test Method 8.27 A Method (Fragile Shape Method), and is within a range of 110 to 160 cm ³ / cm ² · s. Preferably there is.

The backing portion may further include at least one layer made of a nonwoven fabric having a basis weight of 120 to 220 g / m ² .
The backing portion may further include at least one layer capable of retaining moisture.
A sheet formed of a nonwoven fabric having a basis weight of 90 to 150 g / m ² that is interposed between the mask main body and the mouth may be further disposed on the backing portion.
Further, the air permeability at a water content of 12.5%, which is interposed between the mask body and the mouth, in the lining portion is Japanese Industrial Standard JIS-L-1096 General Textile Test Method 8.27 Method A (Fragile Method) The sheet which is the value measured based on), and is in the range of 40-60 cm < ³ > / cm < ² > * s may be arrange | positioned.

The backing portion may further have a layer made of Japanese paper. Or you may raise adsorption | suction of a virus etc. by having a layer made from polyethyleneglycol instead of Japanese paper.
The said surface part is a nonwoven fabric whose air permeability measured based on Japanese Industrial Standards JIS-L-1096 General textiles test method 8.27 A method (fragile type method) is 25-40cm < ³ > / cm < ² > * s. Preferably it consists of.
The surface material portion may be formed and processed with pleats so as to widen.
The outer surface part may be provided with a belt-like core material on either one of the upper side parts.
The air permeability of the mask has a value measured based on Japanese Industrial Standard JIS-L-1096 General Textile Test Method 8.27 A Method (Fragile Form Method) in the range of 5 to 25 cm ³ / cm ² · s. It is preferable.
In addition, in this specification, the air permeability of a mask means the value measured about the thing (area: 144cm < ² >) of 16 * 9cm. The air permeability of the mask may vary depending on the size and shape of the mask. That is, the larger the mask area, the finer the density related to ventilation at one point may be, and the smaller the area, the rougher the density needs to be to ensure the necessary amount of breathing. Therefore, it is necessary to increase the air permeability of a mask having an area that is too small, and a mask that is rough at one point and easily allows bacteria and viruses to pass through is dangerous. On the other hand, a mask with an excessively large area may interfere with daily activities. For this reason, it is preferable that the mask has an area of about 70 to 700 cm ² . Note that the area of the mask means the size of the material to be used, and in reality, the volume is often considered depending on the shape to be manufactured.
It is preferable that the mask has a hooking rubber or a hooking string on the side of the mask body, and a string-like member is provided on the side of the mask body.

  According to the present invention, it is possible to provide a mask that is excellent in comfort during use and has a high effect of removing minute harmful substances such as bacteria, viruses and pollen.

Hereinafter, the mask of the present invention will be specifically described with reference to the drawings.
FIG. 1 is a partially cutaway cross-sectional view of a mask according to the first embodiment of the present invention. The mask shown in FIG. 1 is composed of a surface portion 1 and layers 2 and 2 ′ made of a knitted fabric which is a lining portion, and has a first filter layer 3 between the layers 2 and 2 ′ made of a knitted fabric. In addition, the sheet 4 is provided on the side in contact with the face when the mask is used (hereinafter also referred to as “back side” or “face side” in the present specification). Further, ear masking rubbers 5, 5 ′ are provided on the side of the mask main body, and a strip-shaped core member 12 is provided on the upper side of the surface portion 1. Further, the pleating process 11 is applied to the surface portion 1.
In the mask shown in FIG. 1, the layers 2 and 2 ′ made of a knitted fabric are formed from multi-layer structured yarns made of two or more fiber layers. This multilayer yarn will be described later. The 1st filter layer 3 and the sheet | seat 4 are formed from the nonwoven fabric. The mask main body of FIG. 1 is comprised from the surface part 1 and the lining part laminated | stacked in order of the layer 2 which consists of knitting / first filter layer 3 / layer 2 'which consists of knitting / sheet 4 in order.

Although it does not specifically limit as a raw material which forms a surface material part, Paper, cloth, a nonwoven fabric, etc. which have moderate air permeability and a filter function are mentioned. In the present invention, the air permeability is in the range of 25 to 40 cm ³ / cm ² · s as measured based on Japanese Industrial Standard JIS-L-1096 General Textile Test Method 8.27 Method A (Fragile Form Method). Is preferably used. As a nonwoven fabric which shows such air permeability, the nonwoven fabric made from a polypropylene with a density of 0.15-0.3 g / cm < ³ > is mentioned, for example.

  The surface portion may be subjected to charging treatment, adhesive treatment or the like in order to improve the collection performance of fine particles. Moreover, antibacterial processing may be given.

In the present invention, it is not always necessary to apply the pleating process 11 to the surface part 1, but as shown in FIG. 1, by applying the pleating process 11 in the lateral direction, the surface part is widened in the vertical direction and a mask is used. In doing so, it is possible to cover a wide area from the nose to the chin. Similarly, the core material 12 is not necessarily provided, but when used, the gap between the mask and the face is reduced, and bacteria and pollen are prevented from entering from the gap between the mask and the face. For this purpose, it is particularly preferable to provide a belt-like core material 12 on the upper side of the surface portion 1. The core material may be provided on any side of the outer surface portion, and the material and shape of the core material are preferably set as appropriate so as to correspond to the unevenness of the face where the core material is provided.
Moreover, since the outer surface portion is a portion that can be seen from the outside, the outer surface of the outer surface portion may be printed with a design, characters, patterns, or the like within a range that does not hinder the performance of the outer surface portion. For example, a non-woven fabric or cloth on which a design, a character, a picture, or the like is printed, a colored non-woven fabric, a cloth, a cloth, or the like can be given. In this case, as the nonwoven fabric, cloth, etc., those having an average mesh size larger than 30 μm are preferably used.

  The multilayer structure yarn used for producing the mask of the present invention means a yarn composed of two or more fiber layers of an inner layer and an outer layer. For example, as a minimum fiber layer, two layers of an outermost layer and an inner layer are used. A fiber layer structure is sufficient, and no strict layer boundaries are required. The inner layer may be a single layer or a multilayer, and the innermost layer only needs to be used as the core of the multilayer structured yarn. FIG. 2 is a perspective view showing a cross section of an example of a multilayer structured yarn composed of two fiber layers, and a two-layer structured yarn composed of a fiber layer forming the core portion 21 and a fiber layer forming the sheath portion 22. It is.

Examples of the types of fibers forming each fiber layer include synthetic fibers and cellulosic fibers. Specifically, examples of the synthetic fiber include polyester fiber, nylon fiber, vinylon fiber, and acrylic fiber. Examples of the cellulosic fibers include natural fibers such as cotton fibers and hemp, regenerated fibers such as rayon and polynosic, semi-synthetic fibers such as acetate and triacetate, and the like. The fibers arranged in each fiber layer can be appropriately selected from the above fibers.
In the present invention, it is preferable to use a two-layer structured yarn in which polyester fibers are arranged in the core and cotton fibers are arranged in the sheath. Since the multilayer structured yarn having such a structure has both the hygroscopic property of the cotton fiber and the divergence of the polyester fiber, when used in a mask, the moisture content inside the mask can be adjusted appropriately. Cloudiness is reduced.

In the mask of the present invention, it is preferable to use the layers 2 and 2 'made of a knitted fabric obtained by knitting the multilayer structured yarn into a cloth shape while forming a stitch (loop). This is because the use of a knitted fabric improves air permeability, and further improves hygroscopicity and divergence. The air permeability of the knitted layers 2 and 2 'is a value measured based on Japanese Industrial Standard JIS-L-1096 General Textile Test Method 8.27 A Method (Fragile Form Method), 110 to 160 cm ³ / cm ^2. -It is preferable to be within the range of s. The knitted fabric structure is not particularly limited, and may be either a warp knitting or a weft knitting.

  The layers 2, 2 'made of the knitted fabric are preferably subjected to antimicrobial processing. The antibacterial processing can be used without particular limitation as long as it can suppress at least the growth of bacteria and viruses, and the type and method thereof are not particularly limited. For example, natural antibacterial agents such as catechin, chitin, chitosan, hinokitiol, organic antibacterial agents such as diphenyl ether antibacterial agents, chlorhexidine antibacterial agents, inorganic antibacterial agents such as titanium oxide and silver antibacterial agents, etc. And a method of impregnating or surface coating.

  The mask of the present invention can prevent fine particles from entering the body by the surface portion 1 and the layers 2 and 2 'made of the knitted fabric. The layers 2, 2 ′ comprising the filter layer 3 further.

The 1st filter layer 3 can hold | maintain a water | moisture content, for example, the nonwoven fabric, Ome cotton, gauze etc. whose basic weight is 80-300 g / m < ² > are mentioned. Thus, since the filter layer 3 is provided, it becomes possible to capture bacteria, viruses, and the like. When using a nonwoven fabric, the air permeability of the nonwoven fabric is a value measured based on Japanese Industrial Standard JIS-L-1096 General Textile Test Method 8.27 A Method (Fragile Form Method), and is 25 to 40 cm ³ / cm ^2. -It is preferable to be within the range of s. As the collection performance of the filter layer 3, one that can collect particles having a diameter of 0.4 μm is preferable. Viruses are finer than 0.4 μm, but they are usually dispersed in moisture, attached to dust, or present together with other particles such as bacteria, Unless 0.4 μm particles are allowed to pass through, it is considered that the collection performance of bacteria and viruses is sufficient.

  In the present invention, the number of layers of the knitted fabric or the filter layer and the layer configuration such as the order of laminating each layer are not particularly limited, but it is preferable to take a layer configuration in which the knitted layer sandwiches the filter layer. This is because when the moisture retained in the knitted layer is transferred to the filter layer, the particulate collection performance of the filter layer is improved, and when the knitted layer is antibacterial processed This is because the effect of inhibiting the growth of bacteria / viruses collected in the filter layer can also be expected.

It is preferable that a sheet 4 interposed between the mask main body and the mouth is further disposed on the backing portion of the mask of the present invention. This sheet is preferably formed of a material that can be directly touched by the mouth and has an appropriate softness, and that can be used by adding moisture to the sheet as necessary to prevent passage of fine particles. For example, the nonwoven fabric made from polyester whose basic weight is 90-150 g / m < ² > is mentioned. Moreover, the nonwoven fabric made of polyester can be used by wrapping with gauze, and gauze, cotton cloth, etc. can also be used. Further, when the sheet is used with moisture contained therein, for example, the air permeability at a water content of 12.5% is determined by Japanese Industrial Standard JIS-L-1096 General Textile Test Method 8.27 Method A so that breathing does not become difficult. It is preferably a value measured on the basis of the Frazier type method) within a range of 40 to 60 cm ³ / cm ² · s. Further, the shape of the sheet is not particularly limited, but is preferably a shape that can cover the mouth and the nose.

Next, a mask according to a second embodiment of the present invention will be described with reference to the drawings.
FIG. 3 is a partially cutaway cross-sectional view of a mask according to the second embodiment of the present invention. In FIG. 3, the 1st filter layer 3 and the 2nd filter layer 6 are arrange | positioned in the layer 2 which consists of the knitted fabric formed in the bag. In addition to the ear hooking rubbers 5 and 5 ′, string-like members 7 and 7 ′ are further provided on the side of the outer surface portion 1.

  In the present invention, the number and type of filter layers provided in the mask backing can be appropriately selected according to the purpose. However, when priority is given to improving the collection performance of the fine particles, the first filter layer 3 and the second filter layer 3 The filter layer 6 is preferably provided. For example, the first filter layer 3 may be a combination using the aforementioned non-woven fabric, and the second filter layer 6 may be a combination using Japanese paper.

  As Japanese paper used, it may be used as it is, or it may be softened by holding Japanese paper.

  In the mask shown in FIG. 3, the knitted layer 2 is a bag, but the upper side may be cut so that the filter layer can be replaced.

  The mask shown in FIG. 3 is further provided with string-like members 7 and 7 ′ on the side of the top surface portion for the purpose of improving the degree of adhesion between the mask body and the face. The material of the string-like members 7 and 7 'is not particularly limited, and examples thereof include an elastic material such as a rubber string. As shown in FIG. 3, in the case of having two string-like members 7, 7 ', when using the mask, the mask body is obtained by turning the string-like members 7, 7' to the back side of the face and tying them. Can be fixed so that there is no gap between the side of the mask body and the cheek. A tape portion may be provided on the string-like member so that it can be easily connected, or a string-like member having elasticity that is connected to a single string may be fixed without being tied. The thickness and cross-sectional shape of the string-like member are not particularly limited.

  In the present invention, the shape and thickness of the mask, the layer configuration of the backing portion, and the like can be appropriately set according to the purpose. For example, each material constituting the mask is cut into a horizontally long rectangle, and the surroundings are laminated in the order of the outer layer / knitted layer / filter layer / knitted layer, and the sheet is used between the mouth and the mask when used. You may make it arrange | position between. As described above, the number of layers of the knitted fabric, the number of filter layers, the order of lamination, and the like are not particularly limited.

The mask of the present invention has a gas permeability of 5 to 25 cm ³ / cm ² · s measured based on Japanese Industrial Standard JIS-L-1096 General Textile Test Method 8.27 Method A (Fragile Form Method). It is preferable to be within the range. If the breathability of the mask is within such a range, breathing does not become difficult while maintaining the particulate collection performance.

  In the mask of the present invention, the string-like member may be removable. A means for making the string-like member detachable will be described with reference to FIG. FIG. 4 is a perspective view of the string-like member. In FIG. 4, the clip 43 is connected to the string-like member 41, and the clip-like member 41 sandwiches the side of the outer surface portion of the mask. Is attached to the side of the mask's outer surface. Attaching the string-like member 41 shown in FIG. 4 to both sides of the side surface of the mask's outer surface portion, attaching the mask to the face, and then fixing the mask body by turning the string-like member 41 to the back side of the face and tying it, It can be used so that there is no gap between the side of the mask body and the cheek. A tape portion may be provided on the string-like member so that it can be easily connected, or a string-like member having elasticity that is connected to one string may be used so that it can be fixed without being tied.

  A means for making the string-like member detachable will be described with reference to FIG. FIG. 5 is a perspective view of a mask according to the third embodiment of the present invention. In FIG. 5, a string-like member attaching portion 33 is provided on the side of the outer surface portion of the mask. The string-like member attaching part 33 is formed in an annular shape, and can pass the string-like member through the cavity, and like the mask shown in FIG. 3, the string-like member attaching part 33 is passed through the cavity of the string-like member attaching part 33. To fix the mask body by attaching the string member to the face and then tying the string member to the back side of the face to fix the mask body, so that there is no gap between the side of the mask body and the cheek can do. The string-like member attaching portion 33 may be made of metal, or may be made of a fiber or a nonwoven fabric used for manufacturing the mask of the present invention.

Next, a mask according to a fourth embodiment of the present invention will be described with reference to the drawings.
FIG. 6 is a perspective view of a mask according to the fourth embodiment of the present invention. The mask shown in FIG. 6 is provided with a cushioning material 31 along the side of the layer made of knitted fabric. Examples of the buffer 31 include those made of urethane, ether, ester, and the like, and any buffer having the same function can be used without particular limitation. Commercially available materials can also be used as the buffer material, for example, Rendell HSS2000, ESW-4, EGR-12, etc. manufactured by Tohoku Inoac Co., Ltd. can be used. In addition, urethanes manufactured by Bridgestone Corporation, Sanwa Corporation, and Achilles Corporation can also be used. By providing such a cushioning material 31, the cushioning material 31 can be deformed according to the shape of the cheek, so that no gap is generated between the side of the mask body and the cheek. The buffer material 31 preferably has a thick central portion in the longitudinal direction. By forming the central portion in the longitudinal direction to be thick, a gap between the side of the mask main body and the cheek becomes even less likely to occur. The size of the buffer material 31 is not particularly limited, but the width is preferably about 2 to 15 mm, the length is preferably about 40 to 100 mm, and the lateral width is preferably about 3 to 20 mm. The thickness is preferably about 0.5 to 8 mm. Further, the central portion in the longitudinal direction is preferably formed thick as described above, and may be about 1 to 4 mm. The cushioning material 31 may be attached to a layer formed of a knitted fabric using an adhesive, or may be sewn with a thread or the like.

  Hereinafter, the present invention will be described in more detail with reference to examples. Needless to say, the scope of the present invention is not limited to such examples.

About the physical-property value and evaluation of the raw material which were used for the Example, and the produced mask, it calculated | required with the following test method.

<Test method>
-Density, thickness, weight About the density, thickness, and weight of the used raw material, it measured based on the method of Japanese Industrial Standard JIS-L-1096. However, when the material was Japanese paper, the measurement was performed based on the method of Japanese Industrial Standard JIS-P-8118.

-Air permeability The air permeability of the used material and the produced mask was measured based on Japanese Industrial Standard JIS-L-1096 General Textile Test Method 8.27 Method A (Fragile Form Method). In addition, the measurement was performed 3 to 5 times, and the average value was shown.

-Fine particle collection performance McFarland No. A bacterial solution of Streptococcus pneumoniae (diameter: about 0.4 μm) prepared to a concentration of 4 was sprayed into a safety cabinet using an ultrasonic humidifier. Subsequently, the air in the cabinet was sucked at 100 liters / minute for 2 minutes by an air sampler covered with the produced mask. Thereafter, the mask member (sheet 4 in the mask shown in FIG. 1) that finally forms a layer through which air passes is cut into a size of 3 cm × 3 cm, placed on a medium, and cultured at 35 ° C. for 20 hours. . By dividing the measured number of bacteria by the suction area of the mask, the number of permeated bacteria per 1 cm ³ of the mask was determined.

Example 1
As the surface material portion, a polypropylene nonwoven fabric (density: 0.21 g / cm ³ , air permeability: 33.4 cm ³ / cm ² · s) subjected to pleating was used. As the lining part, a knitted fabric (thickness: 0.53 mm, basis weight: 201.0 g / m ² ) using commercially available two-layer structured yarn (core part: polyester fiber, sheath part: cotton fiber), control bacteria by pyridine Processed), polyester non-woven fabric (thickness: 1.40 mm, basis weight: 122.1 g / m ² ) as a first filter, and polyester non-woven fabric (thickness: 0.33 mm, basis weight as a sheet) : 98.9 g / m ² ).
The above-mentioned member is cut into a predetermined shape, the outer surface member / knitted fabric / first filter / knitted fabric are stacked in this order, the surroundings are bonded together, and the sheet is stacked on the outer knitted fabric, as shown in FIG. Was made.

About the produced mask, the air permeability of the direction from the surface part side to the lining part side and the air permeability of the direction from the lining part side to the surface part part were measured. Furthermore, the same measurement was performed under the condition where moisture was contained in the sheet. The water content of the sheet was 12.5% (* 14.1 / (98.9 + 14.1) × 100). Further, the air permeability after 5 minutes from the addition of moisture was also measured in the same manner.
Incidentally, the air permeability of the sheet, 203.0cm ³ / ^cm 2 · s in a dry state, was 48.8cm ³ / cm ² · s in a state of containing moisture.
Further, the fine particle collection performance of the produced mask was also evaluated under both conditions of the sheet in a dry state and a state in which moisture was contained.
The obtained results are shown in Table 1.

Example 2
In Example 1, Japanese paper (“A-250”, thickness: 0.10 mm, basis weight: 37.6 g / m ² ) was used as the second filter for the lining portion, and the outer material / knitted fabric / second A mask was prepared in the same manner except that the order was filter / first filter / knitted fabric / sheet.
The obtained mask was evaluated, and the obtained results are shown in Table 1.

Example 3
A mask was produced in the same manner as in Example 2 except that Japanese paper (“A-380”, thickness: 0.08 mm, basis weight: 32.0 g / m ² ) was used instead of Japanese paper “A-250”. did.
The obtained mask was evaluated, and the obtained results are shown in Table 1.

Example 4
In Example 2, the same procedure except that Japanese paper (“A-380”, thickness: 0.07 mm, basis weight: 28.7 g / m ² ) subjected to hand scissors was used instead of the Japanese paper “A-250”. Thus, a mask was produced.
The obtained mask was evaluated, and the obtained results are shown in Table 1.

Comparative Example 1
A commercially available gauze mask (average mesh size was about 100 μm) was evaluated in the same manner as in the examples. The obtained results are shown in Table 1.

As shown in Table 1, it was found that the mask of Example 1 was excellent in air permeability and excellent in particulate collection performance. Moreover, it turned out that the mask of Examples 2-4 which has Japanese paper is excellent in particulate collection performance.
On the other hand, the commercially available gauze mask had a large number of penetrating bacteria and low particulate collection performance.

Example 5
The mask obtained in Example 3 was washed (hand-washed) for 7 consecutive days in the presence of a detergent, and the air permeability was measured. As a result, the air permeability was 14.8 cm ³ / cm ² · S. . In addition, the appearance (hand washing) was continued for 10 days without adding detergent, and the air permeability was measured. As a result, the air permeability was 14.6 cm ³ / cm ² · S. In the presence of detergent, a mask was placed in a net and washed for 3 minutes in a washing machine. This was performed for 7 consecutive days, and the air permeability was measured. As a result, the air permeability was 14.6 cm ³ / cm ² · S. It was. Since the air permeability of those not washed is 15.7 cm ³ / cm ² · S, it can be seen that the air permeability of the washed ones is recovered despite the small amount of moisture. This means that the sealing degree is restored by moisture by making a hole in Japanese paper by hand or minimizing it.

1 is a partially cutaway sectional view of a mask according to a first embodiment of the present invention. It is a perspective view which shows the cross section of the multilayer structure yarn which consists of a two-layer fiber layer used for this invention. It is a partially cutaway sectional view of a mask according to a second embodiment of the present invention. It is a perspective view of a string-like member. It is a perspective view of the mask which concerns on the 3rd Embodiment of this invention. It is a perspective view of the mask which concerns on the 4th Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Surface layer part 2, 2 'Layer 3 Knitted fabric 1st filter 4 Sheet 5 Ear hook rubber 6 2nd filter 7, 7' String-like member 11 Pleated process 12 Core material 21 Core part 22 Sheath part

Claims (16)

A mask having a surface portion and a lining portion, wherein at least a part of the lining portion is formed of a multilayered yarn composed of two or more fiber layers. The mask according to claim 1, wherein the backing portion has at least one layer made of a knitted fabric formed by knitting the multilayer structured yarn. 3. The mask according to claim 1, wherein the multilayer structured yarn is a structured yarn having a two-layer structure in which a core portion is made of polyester fiber and a sheath portion is made of cotton fiber. The mask according to any one of claims 2 to 3, wherein the knitted fabric is antibacterial processed. The air permeability of the knitted fabric is a value measured based on Japanese Industrial Standard JIS-L-1096 General Textile Test Method 8.27 A Method (Fragile Shape Method), and within a range of 110 to 160 cm ³ / cm ² · s. The mask according to claim 2, wherein the mask is provided. The backing portion is further any one mask according to claim 1, characterized in that basis weight has at least one layer made of a nonwoven fabric is 120~220g / m ^2. The mask according to any one of claims 1 to 5, wherein the backing portion further includes at least one layer capable of retaining moisture. A sheet interposed between the mask main body and the mouth is further disposed on the lining part, and the sheet is formed from a nonwoven fabric having a basis weight of 90 to 150 g / m ^2. The mask according to claim 1. Further, a sheet interposed between the mask main body and the mouth is disposed on the lining, and the air permeability at a moisture content of 12.5% of the sheet is determined by the Japanese Industrial Standard JIS-L-1096 General Textile Test Method The value measured based on the 8.27 A method (Fragile method) is in the range of 40 to 60 cm ³ / cm ² · s, according to any one of claims 1 to 7. mask. The mask according to claim 1, wherein the backing portion further has a layer made of Japanese paper. Nonwoven fabric in which the outer surface portion has an air permeability measured in accordance with Japanese Industrial Standards JIS-L-1096 General Textile Test Method 8.27 A Method (Fragile Shape Method) in the range of 25 to 40 cm ³ / cm ² · s The mask according to claim 1, comprising: The mask according to any one of claims 1 to 11, wherein pleats are formed and processed so that the surface portion is widened. The mask according to any one of claims 1 to 12, wherein the surface portion includes a strip-shaped core material on one of the upper sides. The value measured based on the Japanese Industrial Standard JIS-L-1096 General Textile Test Method 8.27 A Method (Fragile Form Method) is within the range of 5 to 25 cm ³ / cm ² · s. The mask according to claim 1, wherein the mask is a mask. 15. The mask body has a hooking rubber or a hooking string on a side of the mask body, and a string-like member is provided on the side of the mask body. mask. The mask according to any one of claims 1 to 15, further comprising a polyethylene glycol layer on a part of the backing or the mask body.

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