The present invention relates to a mask sheet and a mask.
In the related art, a mask is used, for example, to prevent infection of viruses such as influenza and pathogenic bacteria in medical facilities and cities, and to prevent pollen and dust in an environment where there are many pollen and dust. Further, the mask is also used in a site where hygiene is required, such as a food manufacturing and processing factory, and in a site where odor is generated, such as a cleaning site and a waste water treatment facility. As described above, a usage mode of the mask is diverse.
Various masks are known. For example, Patent Literature 1 discloses a mask in which a sheet-shaped body made of fibrous cellulose that supports a metal such as silver and a deodorant layer or the like are overlapped and sandwiched between nonwoven fabric layers by bringing a metal compound aqueous solution into contact with fine fibrous cellulose having a phosphoric acid group.
Patent Literature 1: JP-A-2020-2483
Incidentally, the sheet-shaped body including the fibrous cellulose described in Patent Literature 1 is excellent in an ability to capture a functional substance, but is required to further improve performance of the mask.
In order to solve the above-described problems, the present invention provides the following mask sheet and mask.
(1) A mask sheet,
in which the mask sheet is a mesh sheet in which twisted yarns are knitted into a mesh shape, the twisted yarn being provided by twisting filaments each of which is formed by coating a synthetic fiber with silver.
(2) The mask sheet according to the above (1),
in which a stitch opening of the mesh sheet is 1 mm or more.
(3) The mask sheet according to the above (1) or (2),
in which the mesh sheet is a tricot-knitted sheet.
(4) A mask for covering a peripheral portion of a mouth and nostrils of a wearer,
in which the mask includes a nonwoven fabric sheet, the mask sheet according to any one of the above (1) to (3), and a mask main body portion in this order from a face side of the wearer,
in which the mask main body portion includes a mesh material having a stitch opening of 1 mm or more, a fabric cloth sewn to the mesh material so as to open a central portion of the mesh material such that a first ventilation portion is formed by the central portion of the mesh material, and a pair of ear straps for fixing the mask main body portion to ears of the wearer, and
in which the mask sheet is overlapped with the first ventilation portion.
(5) The mask according to (4),
in which the fabric cloth is sewn to the mesh material so as to open lateral portions of the mesh material to form a pair of second ventilation portions by the lateral portions of the mesh material adjacent to the first ventilation portion in a left-right direction, and
in which the second ventilation portions are located on left and right outer sides of left and right end portions of the nonwoven fabric sheet.
(6) The mask according to (5),
in which the fabric cloth includes a pair of band pieces that are sewn to the mesh material and separate the first ventilation portion and the second ventilation portions.
(7) The mask according to any one of (4) to (6),
in which the nonwoven fabric sheet having a rectangular shape is larger than the mask sheet having a rectangular shape, and
in which the fabric cloth includes an upper band portion and a lower band portion which are sewn to the mesh material so as to form an opening to sandwich the nonwoven fabric sheet between the mesh material and the fabric cloth.
(8) The mask according to any one of (4) to (7), further including:
a double-sided tape that fixes the nonwoven fabric sheet and the mask sheet by one surface and that fixes the nonwoven fabric sheet and the mask sheet to the mask main body portion by the other surface.
(9) A mask for covering a peripheral portion of a mouth and nostrils of a wearer,
in which the mask includes a nonwoven fabric sheet, the mask sheet according to any one of the above (1) to (3), and a mask main body portion in this order from a face side of the wearer,
in which the mask main body portion includes an outside cloth, a fabric cloth having an upper band portion and a lower band portion sewn to the outside cloth so as to form a first ventilation portion by a central portion of the outside cloth and to vertically include an opening for sandwiching the nonwoven fabric sheet between the fabric cloth and the outside cloth, and a pair of ear straps for fixing the mask main body portion to ears of the wearer, and
in which the mask sheet is overlapped with the first ventilation portion.
(10) A mask main body portion for a mask for covering a peripheral portion of a mouth and nostrils of a wearer in cooperated together with the mask sheet according to any one of the above (1) to (3) and a nonwoven fabric sheet, the mask main body portion including:
a mesh material having a stitch opening of 1 mm or more;
a fabric cloth sewn to the mesh material to form a first ventilation portion in a central portion of the mesh material; and
a pair of ear straps for fixing the mask main body portion to ears of the wearer.
(11) A mask including:
a mask main body portion including the mask sheet according to any one of the above (1) to (3); and
a fixing portion connected to the mask main body portion and configured to fix the mask main body portion to a lower portion of a face of a wearer.
(12) The mask according to (11),
in which the mask main body portion includes a pocket portion for inserting the mask sheet.
According to the mask sheet of the present invention, a surface area of silver that constitutes the mesh sheet can be greatly increased, and disinfection, sterilization, anti-bacteria, or deodorization can be performed more effectively.
According to the mask of the present invention, the nonwoven fabric sheet prevents droplets from the wearer, silver ions contained in a silver filter exhibit excellent disinfection, sterilization, anti-bacteria, and deodorization effects, and in the mask main body portion, since the peripheral portion of a mouth and nostrils of the wearer is covered with the mesh material, the mask main body portion is excellent in air permeability and heat dissipation. Therefore, performance of the mask is more excellent, and the mask can also be favorably used for applications requiring the air permeability, particularly, use under a high temperature such as summer. Further, the silver filter and the mask main body portion can be cleaned and repeatedly used, which is economical.
According to the mask of the present invention, the nonwoven fabric sheet prevents droplets from the wearer, the silver ions contained in the silver filter exhibit excellent disinfection, sterilization, anti-bacteria, and deodorization effects, and the mask main body portion sandwiches the nonwoven fabric sheet between the upper and lower openings, so that the nonwoven fabric sheet and the silver filter can be easily incorporated. Therefore, performance of the mask is more excellent, and the silver filter and the mask main body portion can be cleaned and repeatedly used, which is economical.
Hereinafter, the present invention will be described in detail with reference to the drawings, but the present invention is not limited to the following embodiment.
(Mask Sheet)
A mask sheet 20 of the present invention is a mesh sheet provided by knitting a twisted yarn 21 in a mesh shape, the twisted yarn 21 being provided by twisting a plurality of filaments formed by coating synthetic fibers with silver. Examples of the synthetic fibers can include polyester fibers, polyolefin fibers, nylon fibers, and acrylic resin fibers. Further, if the number of the synthetic fibers is too small, strength and durability are insufficient, and if the number is too large, flexibility and plasticity are insufficient, so that the number of twisted synthetic fibers is suitably 5 to 20.
As a knitting method of the twisted yarn 21, warp knitting is preferable because of excellent stretchability, and for example, tricot knitting can be exemplified.
As another example of the warp knitting, tulle knitting as shown in
A size of the stitch when knitting in a mesh shape, that is, an opening is preferably 1 mm or more. A shape of the stitch is preferably a substantially regular hexagonal shape in terms of strength, and in this case, a diameter is 1 mm or more in terms of an equivalent circle diameter. When the opening is less than 1 mm, air permeability is poor. An upper limit of the opening is suitably 3 mm or less because if the stitch is too coarse, an antibacterial effect, a deodorant effect, and the like, which will be described later, may not be sufficiently provided. The shape of the stitch is not limited to the substantially regular hexagonal shape, and may be a polygonal shape including a rectangle or a parallelogram depending on shaping.
Although silver generates silver ions, the silver ions are unstable and positively charged. Therefore, the silver ions adhere to a cell wall of bacterium in association with oxygen of the bacterium negatively charged, and the cell wall is destroyed and killed (sterilization action). Further, although a cell wall is not destroyed in a bacterium having a strong cell wall, if positive ions adhere to the cell wall, protein synthesis is inhibited, division is not possible, and proliferation of the bacterium is prevented. Furthermore, the silver ions decompose water into hydroxyl radicals and hydrogen radicals as a catalyst, and the hydroxyl radicals are taken into a virus or a bacterium to destroy a cell wall. Therefore, a sterilization effect and an antibacterial effect can be expected for a wide range of viruses and bacteria.
The silver ions also have a deodorant action. Since the silver ions prevent proliferation of various bacteria, putrid odor caused by the various bacteria is prevented. Further, by adsorbing negatively charged malodorous molecules, oxidative decomposition is performed to prevent body odor caused by malodorous molecules from a perspiratory gland and a sebaceous gland and proliferation of bacterium.
Pollen and house dust (allergens) are both positively and negatively charged, but since the silver ions are positively charged, the positively charged allergen repels, and the negatively charged allergen is adsorbed to suppress an activity thereof.
The silver has these effects, and the silver is used for tableware or the like, is used for a medicine such as a sterilizer, a nasal agent, eye drops, and the like, and it is considered that there is almost no evidence that indicates toxicity in a normal clinical test, the silver is also not carcinogenic, and safety is also high.
Further, silver is easily ionized by chlorine. Since exhaled air and saliva of human also contain chlorine, silver is easily ionized in the mask. Further, since tap water contains a small amount of chlorine, when washed with water, the silver is ionized to exhibit a sterilization action or a deodorant action, and the mask sheet of the present invention can be repeatedly used many times only by washing with water.
The coating with the silver is preferably performed on an entire surface of the fiber, but may be performed on a part of the fiber. The larger a coating amount of silver is, the more the effect described above can be provided, but even when the coating amount is excessive, not only the effect is saturated, but also a cost is increased. Specifically, in a mass ratio, filament (fiber amount):silver is preferably 60:40 to 80:20. Further, as a coating method, electroless plating is easy and preferable.
As described above, in the mask sheet 20 of the present invention, since a surface area of the silver is greatly increased, an amount of the silver ions generated and a time during which a silver ion concentration is increased can be shortened, and disinfection, sterilization, anti-bacteria, or deodorization can be more effectively performed. Further, since antibacterial properties of the mask sheet 20 do not deteriorate even when the mask sheet 20 is washed, the mask sheet 20 can be repeatedly used many times, and the effect of generating the silver ions can be maintained for a long period of time.
In order to verify the sterilization effect of the silver, the following test was performed. The test was performed as follows in the Judicial Foundation, the Biological Testing Center of the Japan Chemical Fiber Inspection Association.
(Test Product)
A twisted yarn of a filament provided by electroless plating the silver on a surface of nylon was tricot-knitted in a honeycomb shape to provide a test product (MG net 100: manufactured by Medical Aid Co., Ltd). A coating amount of silver of the filament was 70% by mass of nylon and 30% by mass of silver, a size of the test product was 90 mm in width×70 mm in height×0.2 mm in thickness, and a silver surface area was 0.5 m2 or more. Further, an opening was 1.0 mm, a diameter of the twisted yarn was 0.2 mm, and a diameter of one fiber was 0.02 mm (in a case of 12 filaments), and in this case, a surface area of the silver was 300 times or more a sheet area.
(Test Institution)
Judicial Foundation, Biological Testing Center of Japan Chemical Fiber Inspection Association
(Test Content)
Antibacterial properties and sterilizing properties (unified test method)
(Outline of Test)
Based on the unified test method, a test product and a nylon standard white cloth without silver coating were immersed in a culture solution, the same number of various viable bacteria were inoculated therein, and the number of viable bacteria after 18 hours was inspected. When the number of viable bacteria is counted, the culture solution is diluted 20 times, and when the number of viable bacteria is 0, the display indicates that the number of viable bacteria is 20 or less.
Further, based on a high-temperature accelerated washing method (JIS L 0217, 103, using a JAFET standard detergent), the number of viable bacteria was also inspected when the same test was performed after washing was performed 10 times and 50 times.
(Test Bacterial Species)
Staphylococcus aureus ATCC 6538P, Klebsiella pneumoniae ATCC 4352, MRSA Methicillin Resistant Staphylococcus aureus ID 1677, Escherichia coli O157:H7 ATCC 43888, Pseudomonas aeruginosa NBRC 3080, (Bacterial culture medium)
Luria broth (10 g of tryptone, 5 g of yeast extract, and 0.5 g of salt were dissolved in 1 liter of water).
Test results are as follows.
In the SEK standard (standard of the Japanese Association for the Functional Evaluation of Textiles), a bacteriostatic activity value is 2.2 or more, and antibacterial properties are considered to be good, as is clear from the above Tables 1 to 5. In the test product according to the present invention, not only the bacteriostatic activity value but also a sterilization activity value is at the highest level.
Next, when 5 g of the test product (the MG net 100: manufactured by Medical Aid Co., Ltd) that is a material of the mask sheet was put into 1 liter of ultrapure water, a generation state of a silver concentration (silver ion amount) was inspected. The test was performed at the Osaka Research Institute of Industrial Science and Technology (Headquarters, Izumi Center). Test results are shown in
As a result, it was confirmed that the silver ion concentration exceeded 100 ppb (0.1 ppm) in 1 minute after the test product was put into the ultrapure water. Therefore, although a weight of the mask sheet is 0.1 g, when the test product is used in the mask, silver ions are generated by reacting with moisture of exhaled air in a short time, a concentration of the silver ions contained in the exhaled air in the mask is increased, and disinfection, anti-bacteria, and deodorization in the mask and an allergic substance prevention effect of the pollen are exerted. Further, since the exhaled air containing the silver ions in the mask is discharged to an outside from a gap of the mask, the disinfection, the anti-bacteria, and the deodorization and the allergic substance prevention effect of the pollen are exerted on a periphery of the mask and also eyes. Therefore, the mask sheet can be expected to have an effect of preventing droplet infection and air infection.
Therefore, according to the mask sheet 20 of the present embodiment, the surface area of the silver that constitutes the mesh sheet can be greatly increased, and the disinfection, the sterilization, the anti-bacteria, or the deodorization can be performed more effectively.
(Mask)
A mask 1 of the present embodiment includes the mask main body portion 10, the rectangular mask sheet 20 described above, and a rectangular nonwoven fabric sheet 30. Further, the mask 1 is worn by arranging the nonwoven fabric sheet 30, the mask sheet 20, and the mask main body portion 10 in this order from the face side of the wearer.
As also shown in
As also shown in
The upper band portion 57 and the lower band portion 58 are sewn respectively along upper and lower edge portions of the mesh material 60, and a lower edge portion 55 of the upper band portion 57 and an upper edge portion 56 of the lower band portion 58 are separated from the mesh material 60 to form openings 59a and 59b (see
In a state where the upper band portion 57 and the lower band portion 58 are in contact with the mesh material 60 to close the openings, as shown in
The first ventilation portion 51 is opened in an area corresponding to a peripheral portion of a mouth or nostrils. Specifically, the first ventilation portion 51 has a width in the upper-lower direction that is substantially equal to an upper-lower dimension of the mask sheet 20, and a width in the left-right direction that is wider than a left-right dimension of the mask sheet 20 and is slightly narrower than a left-right dimension of the nonwoven fabric sheet 30. Further, the pair of second ventilation portions 52 and 52 are provided on left and right outer sides of left and right end portions of the nonwoven fabric sheet 30, and serve as passages for the wearer to breathes out on which the nonwoven fabric sheet 30 and the mask sheet 20 are not overlapped. Therefore, breathing becomes easy, and breath is prevented from remaining in the mask. The upper band portion 57 and the lower band portion 58 may have upper-lower dimensions that sandwich the nonwoven fabric sheet 30. Therefore, upper-lower dimensions of the first ventilation portion 51 and the second ventilation portions 52 and 52 can be increased (in the present embodiment, 50% or more of an upper-lower dimension of the mask main body portion 10), and the air permeability can be further improved. In the present embodiment, the upper band portion 57 and the lower band portion 58 of the fabric cloth 50 are integrally formed by sewing two left and right components, and the mesh material 60 is also integrally formed by sewing two left and right components.
A pair of ear straps 40 and 40 for fixing the mask main body portion 10 to ears of the wearer are connected to both left and right ends of the mask main body portion 10 in the drawing. The ear straps 40 and 40 are preferably made of loop-shaped or string-shaped stretchable materials. Examples of the stretchable material can include a union band of rubber yarn and cotton, an interwoven net of a resin filament, and a stretchable nonwoven fabric. The ear straps 40 and 40 are inserted into the tubular folded portions 11 formed by folding the sewn folded portions 61 of the mesh material 60 and the sewn band portions 54 of the fabric cloth 50, and are connected to the mask main body portion 10. The ear straps 40 and 40 may be attached by being sewn to at least one of the mesh material 60 and the fabric cloth 50.
Since the nonwoven fabric sheet 30 is in contact with lower portions of lips and the nose of the wearer, the nonwoven fabric sheet 30 has an action of improving attachment properties of the mask 1 and preventing droplets from the wearer from being discharged to an outside of the mask 1 through the ventilation portion 51 of the mask main body portion 10.
A dimension of the mask sheet 20 in the upper-lower direction has a size substantially equal to that of the first ventilation portion 51 in the upper-lower direction, but the nonwoven fabric sheet 30 needs to be sandwiched between the mesh material 60 and the fabric cloth 50, and thus has a dimension larger than that of the mask sheet 20 in the upper-lower direction, that is, larger than that of the first ventilation portion 51 of the mask main body portion 10 in the upper-lower direction. Further, the nonwoven fabric sheet 30 also has a dimension larger than that of the mask sheet 20 in the left-right direction in order to be bonded with double-sided tapes 80 described later.
In the mask 1 having such a configuration, first, as shown in
Next, with the upper and lower openings of the mask main body portion 10 open, upper and lower edge portions of the nonwoven fabric sheet 30 are inserted, the nonwoven fabric sheet 30 is sandwiched between the mesh material 60 and the upper band portion 57 and the lower band portion 58 of the fabric cloth 50, and the nonwoven fabric sheet 30 and the mask sheet 20 are fixed to the mask main body portion 10 by the other surfaces of the double-sided tapes 80. Accordingly, the mask 1 shown in
As described above, the mask sheet 20 and the mask main body portion 10 can be cleaned and repeatedly used. Specifically, after use, the double-sided tapes 80 are peeled off, the used nonwoven fabric sheet 30 is discarded, and in the same manner as described above, the mask sheet 20 and the mask main body portion 10 can be repeatedly used by using the new double-sided tapes 80 and the new nonwoven fabric sheet 30 and assembling the new double-sided tapes 80 and the new nonwoven fabric sheet 30 together with the cleaned mask sheet 20 to the mask main body portion 10.
As described above, according to the mask 1 of the present embodiment, the nonwoven fabric sheet 30 prevents the droplets from the wearer, the silver ions contained in the mask sheet 20 exhibit excellent disinfection, sterilization, anti-bacteria, and deodorant effects, and in the mask main body portion 10, the peripheral portions of the mouth and the nostrils of the wearer are covered with the mesh material 60, so that the mask 1 is excellent in air permeability and heat dissipation. Therefore, performance of the mask 1 is more excellent, and the mask 1 can also be favorably used for applications requiring the air permeability, particularly, use under a high temperature such as summer. Further, since the mask sheet 20 and the mask main body portion 10 can be cleaned and repeatedly used, it is economical. Particularly, by converting an odor substance adhered to the mask main body portion 10 into a compound by the silver ions of the mask sheet 20, it is also possible to deodorize the mask main body portion 10. Therefore, even when the mask main body portion 10 is not washed frequently, the mask main body portion 10 can be used continuously without worrying about odor.
Regarding the mask of the above-described embodiment, the mask 1 may be assembled by fixing only the mask sheet 20 and the nonwoven fabric sheet 30 with adhesive tapes having adhesive surfaces only on one surface, and simply sandwiching the nonwoven fabric sheet 30 between the upper band portion 57 and the lower band portion 58 and the mesh cloth 60 in the mask main body portion 10.
Further, the mask of the above-described embodiment is configured to include the first ventilation portion 51 and the pair of second ventilation portions 52 and 52, but the mask of the present invention may be configured to include only the first ventilation portion 51. Alternatively, the first ventilation portion 51 and the pair of second ventilation portions 52 and 52 may be configured to be continuously formed without including the pair of band pieces 53 and 53.
In the above-described embodiment, the fabric cloth 50 includes the upper band portion 57, the lower band portion 58, the pair of band pieces 53 and 53, and the pair of folded pieces 54 and 54, but the present invention is not limited thereto, and may be sewn to the mesh material 60 by opening the central portion of the mesh material 60 such that the first ventilation portion 51 is formed by the central portion of the mesh material 60.
In the above-described embodiment, the mask main body portion 10 uses the mesh material 60 as the outside cloth, but the present invention is not limited thereto. As shown in
Accordingly, the nonwoven fabric sheet 30 prevents droplets from the wearer, silver ions contained in the mask sheet 20 exhibit excellent disinfection, sterilization, anti-bacteria, and deodorization effects, and the mask main body portion 10 sandwiches the nonwoven fabric sheet 30 between upper and lower openings, so that the nonwoven fabric sheet 30 and the mask sheet 20 can be easily incorporated. Therefore, performance of the mask is more excellent, and the mask sheet 20 and the mask main body portion 10 can be cleaned and repeatedly used, which is economical.
(Other Masks)
A mask shown in
The mask main body portion 111 is formed by surrounding the mask sheet 20 with nonwoven fabrics or gauze. For example, as shown in
The present invention is not limited to the above-described embodiment, and modifications, improvements, and the like can be made as appropriate.
This application is based on the Japanese utility model registration application filed on Feb. 28, 2020 (Japanese Utility Model Application 2020-000699) and the Japanese patent application filed on Jun. 30, 2020 (Japanese Patent Application No. 2020-113219), and contents of which are incorporated herein by reference.
Number | Date | Country | Kind |
---|---|---|---|
2020-000699 | Feb 2020 | JP | national |
2020-113219 | Jun 2020 | JP | national |
Filing Document | Filing Date | Country | Kind |
---|---|---|---|
PCT/JP2020/039301 | 10/19/2020 | WO | 00 |