JP6974891B2 - Mask sheet and mask - Google Patents

Description

The present invention relates to a mask sheet and a mask.

Conventionally, masks have been used, for example, to prevent infection of viruses and pathogens such as influenza in medical facilities and cities, and to prevent pollen and dust in an environment where a large amount of pollen and dust are present. Masks are also used in sites where hygiene is required, such as food manufacturing and processing factories, and sites where odors are generated, such as cleaning sites and wastewater treatment facilities. As described above, the usage mode of the mask is wide-ranging.

Various masks are known. For example, in Patent Document 1, a sheet made of fibrous cellulose carrying a metal such as silver by contacting an aqueous metal compound with a fine fibrous cellulose having a phosphate group. A mask in which a compound and a deodorant layer or the like are overlapped and sandwiched between non-woven fabric layers is described.

Japanese Unexamined Patent Publication No. 2020-2483

By the way, the sheet-like body having fibrous cellulose described in Patent Document 1 is excellent in the ability to capture functional substances, but there is a demand for further improvement in performance of the mask.

In order to solve the above problems, the present invention provides the following mask sheets and masks.
(1) A mask sheet that is attached to the inside of a mask that covers the periphery of the wearer's mouth and nostrils and is placed at a position where the moisture contained in the wearer's exhaled breath comes into contact with the mask.
It is a mesh sheet knitted in a mesh shape by tricot knitting using only twisted yarn made by twisting 5 to 20 filaments whose entire surface is covered with silver.
The stitch opening in the mesh sheet is 1 mm or more, and the stitch opening is 1 mm or more.
A mask sheet in which at least a part of the silver comes into contact with the water and changes into silver ions.
(2) The mask main body provided with the mask sheet according to (1) above, and
A fixing portion connected to the mask main body and for fixing the mask main body to the lower part of the wearer's face,
A mask characterized by having.
(3) the mask body is characterized by having a pocket portion for inserting sheet said mask (2) mask according.

According to the mask sheet and mask of the present invention, the surface area of silver constituting the mesh sheet can be significantly increased, and sterilization, sterilization, antibacterial or deodorization can be performed more effectively.

FIG. 1 is a schematic plan view showing a tricot-knitted mesh sheet as the mask sheet of the present invention. FIG. 2 is a schematic plan view showing a tulle-knitted mesh sheet as another example of the mask sheet of the present invention. FIG. 3 is a perspective view showing an example of the mask of the present invention. FIG. 4 is a perspective view showing another example of the mask of the present invention.

Hereinafter, the present invention will be described in detail with reference to the drawings, but the present invention is not limited to the following embodiments.

(Mask sheet)
The mask sheet 10 of the present invention is a mesh sheet in which a plurality of twisted yarns 1 obtained by twisting a filament formed by coating synthetic fibers with silver are knitted into a mesh shape. Examples of the synthetic fiber include polyester fiber, polyolefin fiber, nylon fiber, acrylic resin fiber and the like. Further, if the amount of the synthetic fiber is too small, the strength and durability are insufficient, and if the amount is too large, the flexibility and flexibility are insufficient. Therefore, the number of twisted synthetic fibers is 5 to 20.

As a method of knitting the twisted yarn 1, warp knitting is preferable because it is excellent in elasticity, and for example, tricot knitting can be mentioned. FIG. 1 is a plan view showing a mask sheet 10 knitted with tricot, in which a twisted yarn 1 obtained by twisting a plurality of silver-coated filaments is knitted into a hexagonal shape.

Further, as another example of warp knitting, tulle knitting as shown in FIG. 2 can be mentioned. In the illustrated tulle knitting, a mesh-shaped tulle structure C is knitted by threading all the threads through one guide of the osa. At that time, the sinker loop S is passed from the wales W to the wales W to form a substantially regular hexagonal stitch H. Further, the insertion thread L may be used to replace the position of one sinker loop S with two knitting threads SL.

The size of the stitches when knitting in a mesh shape, that is, the stitch opening is preferably 1 mm or more. The shape of the stitch is preferably a substantially regular hexagonal shape in terms of strength, but in that case, the diameter equivalent to a circle is 1 mm or more in diameter. If the opening is less than 1 mm, the air permeability will be inferior. The upper limit of the stitch opening is preferably 3 mm or less because if the stitches are too coarse, the antibacterial effect and the deodorant effect described later may not be sufficiently obtained. The shape of the stitch is not limited to a substantially regular hexagonal shape, and may be a polygon including a rectangle or a parallelogram depending on the shaping.

Silver produces silver ions, which are in an unstable state and are positively charged. Therefore, it adheres to the cell wall of the bacterium in an attempt to combine with the oxygen of the bacterium that is negatively charged, and the cell wall is destroyed to kill (bactericidal action). In addition, bacteria with strong cell walls do not destroy the cell walls, but when positive ions adhere to the cell walls, they inhibit protein synthesis and cannot divide, suppressing the growth of the bacteria. Furthermore, silver ions decompose water into hydroxy radicals and hydrogen radicals as catalysts, and the hydroxy radicals are taken up by viruses and fungi to destroy the cell wall. Therefore, bactericidal and antibacterial effects can be expected against a wide range of viruses and fungi.

Silver ions also have a deodorizing effect. Silver ions prevent the growth of germs and suppress the putrid odor caused by germs. Furthermore, by adsorbing negatively charged malodorous molecules, it is oxidatively decomposed to suppress body odor generated by the growth of malodorous molecules and bacteria from sweat glands and sebaceous glands.

Pollen and house dust (allergens) are both positively and negatively charged, but since silver ions are positively charged, positively charged allergens repel and negatively charged allergens are adsorbed. And suppress its activity.

Although silver has these effects, silver is used in tableware and other medicines such as bactericides, nasal agents, and eye drops, and there is almost no evidence of toxicity in ordinary clinical trials. , It is said that it is not carcinogenic, and it is highly safe.

Furthermore, silver is easily ionized by chlorine. Since human exhaled breath and saliva also contain chlorine, silver is easily ionized in the mask. In addition, since tap water contains a small amount of chlorine, silver is ionized when washed with water to exhibit bactericidal and deodorant effects, and the mask sheet of the present invention can be repeatedly washed with water. Can be used.

The entire surface of the fiber is preferably coated with silver, but it may be a part of the fiber. The larger the amount of silver coated, the more the above-mentioned effect can be obtained, but even if it becomes excessive, not only the effect is saturated but also the cost becomes high. Specifically, in terms of mass ratio, filament (fiber amount): silver = 60:40 to 80:20 is preferable. Further, as a coating method, electroless plating is simple and suitable.

As described above, the mask sheet 10 of the present invention has a significantly large silver surface surface, so that the amount of silver ions generated and the time for the silver ion concentration to increase can be shortened, and sterilization can be performed more effectively. Can be sterilized, antibacterial, or deodorized.
Further, since the antibacterial property of the mask sheet 10 does not deteriorate even after washing, the mask sheet 10 can be used repeatedly many times and can maintain the effect of generating silver ions for a long time.

The following tests were conducted to verify the bactericidal effect of silver. This test was conducted as follows at the Biological Testing Center of the Japan Chemical Fiber Inspection Association.

(examined goods)
The twisted yarn of the filament in which silver was electrolessly plated on the surface of nylon was tricot-knitted into a honeycomb shape to obtain a test product (MG Net 100: manufactured by Medical Aid Co., Ltd.). Coverage of silver in filaments, nylon 70 wt%, a 30 wt% silver, the size of the specimens, Ru width 90 mm × height 70 mm × thickness 0.2mm der. Further, mesh is 1.0 mm, the diameter of the twisted yarn 0.2 mm, the diameter of one fiber is 0.02 mm (the case of 12 filaments).
(Test institution)
Japan Chemical Fiber Inspection Association Biological Testing Center (test content)
Antibacterial and bactericidal (unified test method)
(Examination outline)
Based on the unified test method, the test product and a nylon standard white cloth without silver coating were dipped in the culture solution, and the same amount of various viable bacteria was inoculated therein, and the viable cell count after 18 hours was inspected. When counting the viable cell count, the culture solution is diluted 20 times, and when the viable cell count is 0, the viable cell count is displayed as 20 or less. Furthermore, based on the high temperature accelerated washing method (JIS L 0217, 103, using JAFET standard detergent), the viable cell count when the same test was performed after washing 10 times and 50 times was also examined. (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 aerugosa )
Luria broth (10 g of tryptone, 5 g of yeast extract, 0.5 g of salt dissolved in 1 liter of water)

The test results are as follows.

According to the SEK standard (standard of the Textile Product New Function Evaluation Council), the bacteriostatic activity value is 2.2 or more and the antibacterial property is good. Not only the bacteriostatic activity value but also the bactericidal activity value is the highest level.

(mask)
As shown in FIG. 3, the mask of the present invention is connected to a mask main body 11 provided with the above-mentioned mask sheet 10 (not shown in FIG. 3) and the mask main body 11, and the wearer wears the mask main body 11. It is provided with an ear hook portion 13 which is a fixing portion for fixing to the lower part of the face. The ear hook portion 13 is preferably made of a loop-shaped or string-shaped elastic material. Examples of the stretchable material include a mixed woven band of rubber thread and cotton, a mixed knitted net of resin filament, and a stretchable non-woven fabric.

The mask main body 11 is a mask sheet 10 surrounded by a non-woven fabric or gauze. For example, as shown in FIG. 4, the mask main body 11 is welded with both end portions and lower end portions (one of the upper and lower end portions) of two non-woven fabrics (front side sheet and back side sheet) having substantially the same size. A pocket portion 14 which is bonded and has an opening at the upper end portion (the other of the upper and lower end portions) of the two nonwoven fabrics may be formed by the two nonwoven fabrics, and the mask sheet 10 may be inserted through the opening of the pocket portion 14. .. Alternatively, the two non-woven fabrics may be formed by joining both end portions thereof to form a pocket portion 14 into which the mask sheet 10 can be inserted through the openings at the upper end portion and the lower end portion. Further, the mask sheet 10 may be used alone, or may be laminated with, for example, a sheet having an aromatic effect or a moisturizing effect, if necessary. Further, it is preferable that the mask main body portion 11 has creases capable of forming a pleated three-dimensional shape. Such creases are formed in a fold shape on the mask main body 11, and the shape is maintained at the ends by joining the ends on both sides. That is, the unfolding of the creases is prevented at the joints of the both end portions, and the folds are unfolded at the time of mounting in the intermediate region located between the both end portions regions, so that the pleats of the mask main body portion 11 are expanded and have a three-dimensional shape. Is formed. When not attached, the pleats can be closed to form a flat surface that is not bulky.

1 Plying 10 Mask sheet 11 Mask body 13 Ear hook (fixing part)

Claims (3)

A mask sheet that is attached to the inside of a mask that covers the periphery of the wearer's mouth and nostrils and is placed at a position where the moisture contained in the wearer's exhaled breath comes into contact with the mask.
It is a mesh sheet knitted in a mesh shape by tricot knitting using only twisted yarn made by twisting 5 to 20 filaments whose entire surface is covered with silver.
The stitch opening in the mesh sheet is 1 mm or more, and the stitch opening is 1 mm or more.
A mask sheet in which at least a part of the silver comes into contact with the water and changes into silver ions. The mask main body including the mask sheet according to claim 1 and the mask main body.
A fixing portion connected to the mask main body and for fixing the mask main body to the lower part of the wearer's face,
A mask characterized by having. The mask according to claim 2 , wherein the mask main body portion has a pocket portion for inserting the mask sheet.

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