WO2017131210A1

WO2017131210A1 - Mask and method for manufacturing same

Info

Publication number: WO2017131210A1
Application number: PCT/JP2017/003061
Authority: WO
Inventors: 高尾　幸博; 博士矢部
Original assignee: 株式会社日本化学研究所
Priority date: 2016-01-28
Filing date: 2017-01-27
Publication date: 2017-08-03
Also published as: JPWO2017131210A1; JP6905940B2; CN108601413A

Abstract

Provided are: an inexpensive mask and a method for manufacturing the same, the mask itself having good fit and sealing to the face, being unlikely to fog glasses, and, having good adhesion to the face, being unlikely to be vertically displaced, tackiness not being so strong such that pain or other discomfort is experienced when the mask is removed, the elimination of release paper also being possible, etc., and in particular, the mask having good folding workability; and a mask and a method for manufacturing the same in which stringiness can be minimized when a hot-melt material is applied, and reduction in processability and product appearance can be minimized. This mask (1) is characterized by being provided with a hot-melt material (10) that is caused to adhere to a nonwoven cloth around the peripheral edge (4) of the mask inner surface (6), the hot-melt material (10) being in contact with the face (21) when the mask (1) is mounted on the face (21), and the A hardness of the hot-melt material (10) being less than 50. Also, the hot-melt material (10) is characterized by containing a thermoplastic elastomer, and by having a melt viscosity of 180,000 mPa∙s or less at 190°C .

Description

Mask and manufacturing method thereof

The present invention relates to a mask and a manufacturing method thereof.

Conventionally, it has been proposed that disposable masks are provided with a piece of resin such as polyethylene or a metal piece at the upper end of the mask body at the upper end of the mask main body so that the upper end is pressed against the nose (Patent Document 1). . These resin pieces and metal pieces are also called nose fitters, and disposable masks provided with these pieces are used as commercial products.

In addition, a technique has been proposed in which foamed plastic is attached to a mask nonwoven fabric with an adhesive at the contact portion with the nose as a measure to prevent fogging of glasses (Patent Documents 2 to 5). This foamed plastic is also referred to as a nose cushion, and a cushion material that prevents exhalation of breath is pasted and adhered to the mask nonwoven fabric, and exhaled air from the nose and mouth comes out upward from the mask body. Prevents the lens from fogging.

However, the conventional nose fitter alone has insufficient sealing properties on both sides of the nose, sealing properties on both sides of the mask, and cannot be shut off from the outside air. In addition, it cannot sufficiently suppress the suction of viruses such as colds, pollen, dust, dust, etc., and even if a person with a cold wears a mask, the scattering of viruses cannot be sufficiently suppressed. Also, since exhalation leaked from both sides of the nose, the effect of anti-fogging on the glasses was also poor.

Also, the nose cushion has a problem that the manufacturing process is complicated and the cost is high because a foamed plastic sheet is punched out and attached to the mask body with an adhesive. In addition, there was a feeling of pressure on both sides of the nose, and a sense of incongruity (foreign object sensation) had to be felt.

Further, the conventional mask has a problem that the mask itself is easily displaced up and down because it is difficult to fit the face and the adhesion is not sufficient.

In order to eliminate the above-mentioned problems such as sealing performance, a highly water-containing gel such as acrylic oxide or gelatin as an adhesive (Patent Document 6), double-sided adhesive tape (Patent Document 7) ) Is proposed. These techniques focus on the adhesiveness of the material to improve the adhesion to the face and improve the sealing performance.

However, in the mask of Patent Document 6, there is a concern that the cosmetic material applied to the face adheres to and peels off the highly water-containing gel, and the gel is cold at the beginning of wearing and tends to give an uncomfortable feeling. In the mask of Patent Document 7, it is necessary to fasten the mask body to the cheek surface with a double-sided adhesive tape against the elasticity of a resin piece or a metal piece, so use a double-sided adhesive tape with high strength adhesive force. Therefore, it is inevitable that a strong sense of incongruity occurs on the adhesive skin surface of the double-sided pressure-sensitive adhesive tape, and the mask is susceptible to stress when it is used continuously for a long time. In addition, it is difficult to select a double-sided adhesive tape that has high adhesive strength and does not cause itching or rash on the skin.

Disposable masks generally include so-called “pleat type” and “three-dimensional type”. In Patent Document 8, in a saddle-shaped three-dimensional mask that uses a folded left and right mask body, each left and right mask body is independently spaced apart from a portion corresponding to the center of the nose. It has been proposed to provide two hot melt pressure sensitive adhesives.

Utility Model Registration No. 3021220 Utility Model Registration No. 3112218 Japanese Patent Laid-Open No. 2003-236000 Japanese Patent No. 4471966 JP 2012-85728 A Japanese Patent Laid-Open No. 11-128378 JP 2014-223227 A Japanese Patent No. 4018024

Patent Document 8 does not disclose details of the hot melt pressure sensitive adhesive. Hot melt pressure sensitive adhesives are only described as thermoplastic polymer based solvent and water free adhesive mixtures, but thermoplastic melt based hot melt pressure sensitive adhesives are generally elastic. Since it is lacking or hard, if an additive is used for imparting adhesiveness, the adhesiveness is too strong, and when the mask is removed, an uncomfortable feeling such as pain may be felt. Further, in the embodiment of Patent Document 8, each of the two hot melt pressure sensitive adhesives provided on each of the left and right mask bodies independently at a distance corresponding to the central portion of the nose is provided with each of them. Although the release paper to cover is affixed, if the adhesive is strong like this, each hot-melt pressure-sensitive adhesive that faces when the mask body on the left and right sides is folded will stick, so the product will be packaged and sold When doing so, release paper is essential.

In terms of the continuous processing speed at the time of manufacturing the mask and the sealing property of the contact portion with the nose, the hot melt material provided linearly in the vicinity of the upper end of the peripheral edge of the mask is independent of the nose as in Patent Document 8. Rather than providing a space in the portion corresponding to the central portion, it is desirable that the wire is provided in a single line so as to fit continuously on both sides of the nose. In this case, however, the hot-melt material is required to have bending workability. Similar to the bending of the nose fitter part in which the resin piece and the metal piece are plastically deformed, when the hot melt part made of a hot melt material is folded and the workability is evaluated, it is not always possible to process the same as with the nose fitter part. If the hot-melt material is hard, there is resistance at the time of bending, and even if it can be in close contact with the face, it is difficult to be plastically deformed.

The three-dimensional mask is folded and marketed, but the hot melt material is not provided separately at intervals corresponding to the central part of the nose as in Patent Document 8, but is continuously provided on both sides of the nose. If the hot melt material is hard when it is provided in a single line over the left and right mask bodies so as to fit, there is a resistance at the time of folding, and there is a concern about the workability of folding.

In addition, when the nose fitter part of a resin piece or metal piece and a hot melt part are used in combination, the nose fitter part is plastically deformed, but the force to return to it works, and gaps are likely to be generated on both sides of the nose bridge. It is necessary to increase the adhesion between the hot melt part and the skin because it will be damaged. However, when the adhesive force is increased by applying adhesiveness with an additive or the like, the skin feels ugly when the mask itself is removed.

If the adhesiveness of the hot melt material is too strong, the release paper is essential as described above. In Patent Document 8, when a three-dimensional mask is folded, the release sheet is attached to the outer surface side of the adhesive portion because the hot melt pressure sensitive adhesives stick to each other. If a release paper is used, the material cost of the release paper and a process of attaching the release paper are required, which increases the cost. Pleat masks are packaged and sold on top of each other, but when the hot-melt material is highly sticky, the stacked masks are hot-melted just like when a three-dimensional mask is folded. There is concern that the material sticks to it. In this way, disposable masks are folded and stacked and packaged and sold, but after applying a hot melt material and cooling, it can be folded and stacked as it is, and there is no process of pasting release paper and manufacturing process It is desired that it can be simplified.

¡Hot melt guns are used to apply hot melt materials. However, when applied with a hot melt gun, stringing tends to occur in the final application process. The occurrence of stringing impairs workability, and the appearance of the product is impaired when the stringing part remains. In order to apply to the mask at high speed without stringing, it is essential that the melt viscosity at the temperature of the hot melt material at the time of application is low. Depending on the material of the mask itself when the hot melt material is applied, the mask is melted and a hole is opened. Therefore, the hot melt material must have a melting temperature of 190 ° C. or lower.

The present invention has been made in view of the circumstances as described above, and has high sealing performance with the face, glasses are not fogged, adhesion with the face is good, and the mask itself is not easily displaced up and down, and is adhesive. It is an object of the present invention to provide an inexpensive mask with good bending workability and a method for manufacturing the mask, which is not too strong and can hardly feel discomfort such as pain when removing the mask and can omit the release paper.

Another object of the present invention is to provide a mask that can suppress suction of viruses such as colds, pollen, dust, dust, etc., and that people who have colds do not scatter viruses, and a method for manufacturing the same.

Another object of the present invention is to provide a mask that can suppress stringing during application of a hot melt material, and that can prevent deterioration in workability and product appearance, and a method for manufacturing the same.

Another object of the present invention is to provide a mask that has good resin workability and excellent workability even when stringing occurs during application of a hot melt material, and a method for manufacturing the same.

The A hardness specified in JIS K6301-1975 is a standard for measuring the hardness of general rubber. The indenter is pushed into the surface of a non-measured object and deformed, and the amount of deformation (indentation depth) is measured and digitized. A durometer (spring type rubber hardness tester) is used. Fits to the face and has good adhesion, does not feel skin pain when removing the mask, bends during use, especially in the range where it touches both sides of the nose Regarding the bending workability of the obtained hot melt material and the fact that the resistance to bending is small and the adhesiveness to the skin does not deteriorate due to the restoring force, attention was paid to the A hardness rather than the adhesiveness studied in Patent Documents 6-8. A hardness within a specified range and moderate softness, it is easy to deform along the face shape due to the softness, the fit to the face is improved, and even if the shear shear strength, which is an index of adhesiveness, is reduced, the face It fits well and has good adhesion, so it feels good and adheres well to the face without feeling uncomfortable, especially painful, due to the tackiness of the tackifier, etc. Become. As a result, when a plurality of pleated masks are stacked and packaged, or a three-dimensional mask is folded and packed at the center, a release paper may be required to prevent adhesion caused by the hot melt material. Absent. These points can be preferably achieved mainly by using a thermoplastic elastomer having rubber elasticity. Further, when the melt viscosity at 190 ° C. of the hot melt material is in a specific range, stringing can be suppressed, thereby improving workability and suppressing deterioration of the product appearance due to the remaining stringing part. These findings have led to the completion of the present invention.

In order to solve the above-described problems, the mask of the present invention is provided with a hot melt material that is bonded to a nonwoven fabric in the vicinity of the periphery of the inner surface of the mask and that comes into contact with the face when the mask is attached to the face. The hardness is less than 50. In addition, the melt viscosity at 190 ° C. is 180,000 mPa · s or less, and the hot melt material is characterized by containing a thermoplastic elastomer.

The mask manufacturing method of the present invention is the above-described mask manufacturing method, characterized in that a hot melt material is applied to the inner surface of the mask with a hot melt gun.

The mask manufacturing method of the present invention is the above-described mask manufacturing method, wherein when the hot melt material is applied to the inner surface of the mask with a hot melt gun, the hot melt material of the hot melt gun is used in the last step of application. After the switch for discharging the liquid is turned off, the discharge nozzle tip of the hot melt gun is instantaneously brought into contact with the inner surface of the mask near the application end of the hot melt material.

According to the present invention, by making the A hardness less than 50, the wearing sealability with the face is high, the spectacles are hardly fogged, the adhesion with the face is good, the mask itself is not easily displaced up and down, and the adhesiveness is low. When removing the mask without being too strong, it is difficult to feel discomfort such as pain, and the release paper can be omitted, and a mask with particularly good folding workability can be obtained at low cost. Use of a thermoplastic elastomer as the hot melt material is suitable for the expression of these effects.

According to the present invention, when a hot melt material is provided not only near the upper edge but also near the side edge in the vicinity of the peripheral edge of the mask inner surface, the sealing property around the mouth and nostril is further increased, and viruses such as colds and the like Suction of pollen, dust, dust, etc. can be suppressed, and people with colds are less likely to scatter viruses.

According to the present invention, by setting the melt viscosity at 190 ° C. to a specific range, stringing can be suppressed during application of the hot melt material, and workability and deterioration of the product appearance can be suppressed.

According to the mask manufacturing method of the present invention, when the hot melt material is applied to the inner surface of the mask with the hot melt gun, the switch for discharging the hot melt material of the hot melt gun is turned off in the last step of the application. The tip of the hot melt gun discharge nozzle is in contact with the inner surface of the mask in the vicinity of the hot melt material application end, so that even if stringing occurs during the application of the hot melt material, deterioration of the appearance can be suppressed and the resin cuts better. Excellent workability.

It is the figure seen from the mask inner surface side which shows typically one Embodiment of the mask of this invention. It is the figure which looked at the mask of FIG. 1 from the upper end side. It is the figure which showed the state which mounted | wore the mask of FIG. It is a flowchart which shows an example of the process of manufacturing the mask of FIG. It is the figure which showed typically one Embodiment of the manufacturing method of the mask of this invention. It is the figure seen from the mask inner surface side which shows another embodiment of the mask of this invention typically. It is the figure which looked at the mask of FIG. 6 from the upper end side. It is the figure which showed the state which mounted | wore the mask of FIG. It is the figure seen from the mask inner surface side which shows another embodiment of the mask of this invention typically. It is the figure seen from the mask inner surface side which shows another embodiment of the mask of this invention typically. It is the figure seen from the mask inner surface side which shows the modification of embodiment of FIG. 10 typically. It is the figure seen from the mask inner surface side which shows another embodiment of the mask of this invention typically. It is the figure seen from the mask inner surface side which shows another embodiment of the mask of this invention typically.

Embodiments of the present invention will be described below with reference to the drawings.
(First embodiment)
1 to 3 show an embodiment of the mask of the present invention. The mask 1 of the present embodiment shown in FIGS. 1 to 3 includes a mask body 2 for covering a face 21 (for example, around the mouth and nostrils) of the user's face 20 as shown in FIG. 3, and the mask body. 2 and the ear straps 3 and 3 attached in the vicinity of both side ends 4c and 4d.

The mask 1 is a so-called “pleated type” which is disposable, and a pleat portion 7 is provided near the center of the inner surface 6 of the mask 1 as shown in FIG.

The pleat portion 7 is formed with a plurality of pleat crease portions 7a to 7d that are folded with a predetermined width in the vertical direction of the mask body 2 in the lateral direction.

The pleat crease portions 7a to 7d are formed by folding back the mask body 2, and when the pleat portion 7 is expanded by expanding the mask body 2 in the vertical direction, the mask body 2 bulges outward toward the outside. It is comprised so that.

The mask body 2 is a laminated body in which the planar shape is a quadrangle and a plurality of nonwoven fabric sheets are overlapped, and the periphery of the overlapped nonwoven fabric sheets is fixed by welding or the like. The inner surface 6 of the mask main body 2 is provided with fixing

portions

5a, 5b, 5c, 5d in which the nonwoven fabric sheets that are overlapped are fixed linearly along the upper end 4a, the lower end 4b, and the side ends 4c, 4d. Yes.

In the mask main body 2, along the vicinity of the upper end 4 a, a resin piece such as polyethylene or a metal piece (nose fitter) that fits the nose 22 may be accommodated inside the nonwoven fabric on the inner surface 6 and the nonwoven fabric on the outer surface. .

For example, the mask main body 2 includes an outer layer nonwoven fabric sheet disposed on the outside air side and a mouth side inner layer nonwoven fabric sheet in contact with the skin, and has at least one intermediate layer between the outer layer and the inner layer. It is the laminated body which consists of a multilayer nonwoven fabric sheet. A material having air permeability is selected for the outer layer and the inner layer, and a material that functions as a filter is selected for the intermediate layer.

As the non-woven material constituting the mask body 2, generally known materials can be used as the material of the mask 1. For example, the nonwoven fabric etc. of the synthetic fiber comprised by polyolefin fiber and polyester fiber are mentioned. Specifically, for example, the core / sheath is made of polypropylene / polyethylene, polyethylene terephthalate / polyethylene, polyethylene terephthalate / low melting point polyethylene terephthalate, polypropylene / polypropylene or other core-sheath composite fiber, polypropylene alone or polyethylene terephthalate alone. The regular fiber comprised by these is used. Examples of other nonwoven materials include rayon fibers, nylon fibers, acetate fibers, wool fibers, cotton fibers, urethane fibers, and the like.

As the nonwoven fabric sheet, a spunbond nonwoven fabric, a thermal bond nonwoven fabric, a spunlace nonwoven fabric, an air-through nonwoven fabric, a melt blown nonwoven fabric, a needle punched nonwoven fabric, or the like can be used.

Instead of at least a part of the plurality of nonwoven fabric sheets, gauze, paper, a moisture-permeable resin sheet, or the like may be used.

Near the side edges 4c and 4d of the mask body 2, ear straps 3 and 3 are attached by welding or the like. As shown in FIG. 3, the ear straps 3, 3 can be attached to the face 21 by being hooked on the

ears

23, 23 from the left and right sides of the mask body 2. The material of the ear straps 3 and 3 is preferably a stretchable material such as rubber. In the mask 1 of the present embodiment, a hot melt material 10 is provided on the inner surface 6.

The hot melt material 10 is bonded to the nonwoven fabric in the vicinity of the peripheral edge 4 on the inner surface 6 of the mask body 2. Here, the vicinity of the peripheral edge 4 refers to the periphery of the portion facing the mouth when the mask 1 is mounted on the face 21, particularly the pleat portion 7, the peripheral edge 4 including the upper end 4a, the lower end 4b, and the side ends 4c and 4d. Between.

The hot melt material 10 has essential components such as resin, rubber, and elastomer, and can be applied as a coating material to the nonwoven fabric used in the mask body 2. At the time of application, the main component becomes a coating material having appropriate fluidity and viscosity by heating and melting, and after application, the fluid loses fluidity by cooling and becomes a soft elastic body, which is bonded to the nonwoven fabric itself. .

The preferable conditions of the hot melt material 10 are that it can be applied with a hot melt gun, can be thickened with an appropriate viscosity, etc., does not penetrate into the nonwoven fabric of the mask body 2 or does not melt the nonwoven fabric, and is safe and hygienic in terms of skin. In contrast, various materials can be used as the hot melt material 10 as long as they do not contain allergens and the surface easily fits the skin, and satisfy these conditions.

The main component of the hot melt material 10 is not particularly limited, and any of resin, rubber, elastomer and the like may be used. Examples of the main component of the hot melt material 10 include thermoplastic elastomers, polyolefins, synthetic rubbers, polyamides, polyesters, acrylics, and polyurethanes. These may be used alone or in combination of two or more. Polyolefin-based ethylene / vinyl acetate copolymer (EVA), ethylene / propylene copolymer, ionomer (by making metal ions such as sodium and zinc act on the ethylene / acrylic acid copolymer to form an ion bridge structure) Can also be used. In the case of an ethylene-based copolymer, the comonomer is copolymerized and softened by a method of reducing the degree of crystallinity. In the case of EVA, the VA concentration is 45 to 60% by mass and the crystallinity is lost. Such EVA can also be used, and preferably has a VA concentration of 9 to 46% by mass, more preferably a VA concentration of 19 to 46% by mass. Among them, the hot-melt material 10 is characterized by ensuring adhesion even if the shear shear strength is reduced by its lower hardness than adhesiveness. From this point, pay attention to adhesion by flexibility and elasticity. It is important to use a thermoplastic elastomer having rubber elasticity and good workability when melted due to thermoplasticity.

In the hot melt material 10, as additives other than the main component, tackifier resin, softener, wax, etc., for example, lubricant, deodorant, foaming agent, pigment, antioxidant, fragrance, water absorbent resin, A heat stabilizer, light stabilizer, weathering agent, ultraviolet absorber, light stabilizer, reinforcing agent, antistatic agent, antibacterial agent, antifungal agent, dispersant and the like can be blended.

Among these, examples of the lubricant include silicone oils; hydrocarbon lubricants such as paraffin wax, microwax and polyethylene wax; butyl stearate, monoglyceride stearate, pentaerythritol tetrastearate, stearyl stearate and the like. These may be used alone or in combination of two or more.

The deodorant can be used zeolite, generally a generic name of aluminosilicate having a three-dimensional skeleton structure, as a general formula, expressed in _{_{xM 2 / n O · Al 2}} O 3 · ySiO 2 · zH 2 O The Here, M represents an ion capable of ion exchange, and is usually a monovalent or polyvalent metal ion. n is the valence of an ion-exchangeable ion (metal ion). Further, x and y are the metal oxide and silica molar coefficients, respectively, and z is the number of moles of crystal water. In the present invention, natural zeolite and synthetic zeolite can be used regardless of, for example, natural zeolite includes mordenite (mordenite), erionite (molybdenite), clinobutyrolite, chabazite (orthorbite) and the like. Can be mentioned. Examples of synthetic zeolite include A-type zeolite, X-type zeolite, Y-type zeolite, L-type zeolite, and omega-type zeolite. These may be used alone or in combination of two or more.

As the thermoplastic elastomer as the main component of the hot melt material 10, a styrene-based elastomer is preferable in consideration of heat resistance and sealing properties due to the elasticity of the elastomer. The styrene elastomer is composed of a styrene polymer block and an elastomer block.

When the styrene content is high, the surface hardness is hard, and when it is low, the surface hardness is soft and can be selected from 10 to 50% by mass, preferably 20 to 40% by mass, and more preferably 28 to 33% by mass. Specific examples of styrene block copolymers include styrene-butadiene block copolymers, styrene-butadiene-styrene block copolymers, styrene-isoprene block copolymers, styrene-isoprene-styrene block copolymers, and styrene. -Ethylene / butylene block copolymer, styrene-ethylene / butylene-styrene block copolymer, styrene-ethylene / propylene block copolymer, styrene-ethylene / propylene-styrene block copolymer, styrene-isobutylene block copolymer And styrene-isobutylene-styrene block copolymer. In the above, “ethylene / butylene” represents a copolymer block of ethylene and butylene, and “ethylene / propylene” represents a copolymer block of ethylene and propylene. The thermoplastic elastomer may be used in combination of two or more kinds of triblock copolymer or a mixture with a diblock copolymer.

Examples of the styrene monomer used in the styrene polymer block include styrene, t-butylstyrene, α-methylstyrene, p-methylstyrene, divinylbenzene, 1,1-diphenylstyrene, N, N-diethyl-p-amino. Examples thereof include ethylstyrene and N, N-vinylpyridine. Of these, styrene and α-methylstyrene are preferable.

The elastomer block contains isoprene (I), butadiene (B), ethylene-butylene (EB), ethylene-propylene (EP) or ethylene-ethylene-propylene (EEP).

As the block structure, A: styrene polymer block, B: elastomer block, ABA type can be used, and one type can be used alone or two or more types can be used as a blend. For example, SEBS type and SEPS type can be preferably used.

The styrenic elastomer preferably has a melt flow rate (MFR: [g / 10 min], 200 ° C./5 kg load, (JIS K7210) of 1 to 70, a specific gravity of 0.86 to 0.98, and a solution viscosity (10 The mass% toluene solution) is preferably 5 to 2000 mPa · s (25 ° C.).

When the main component of the hot melt material 10 is a thermoplastic elastomer, it is preferable to contain a softener as an additive other than the main component. The softening agent softens the hot melt material 10 and can impart plasticity and coating processability. Examples of the softener include paraffinic, naphthenic and aromatic process oils; phthalic acid derivatives such as dioctyl phthalate and dibutyl phthalate; white oil; mineral oil; liquid co-oligomer of ethylene and α-olefin; liquid paraffin Polybutene; low molecular weight (peak top molecular weight of about 400-90000) polyisobutylene; liquid polybutadiene, liquid polyisoprene, liquid poly (isoprene-butadiene) copolymer, liquid poly (styrene-butadiene) copolymer, liquid poly (styrene) -Isoprene) liquid polydienes such as copolymers and hydrogenated products thereof. These may be used alone or in combination of two or more.

Among these, from the viewpoint of compatibility with thermoplastic elastomer, paraffinic process oil; liquid co-oligomer of ethylene and α-olefin; liquid paraffin; low molecular weight (peak top molecular weight of about 400 to 90000) polyisobutylene; liquid polydiene And hydrogenated products thereof.

The content of the softener is preferably 20 to 300 parts by weight, more preferably 50 to 300 parts by weight, and still more preferably 50 to 250 parts by weight with respect to 100 parts by weight of the thermoplastic elastomer. If the softener content is too small, the viscosity is too high to cause lining, and if too much, the softener tends to bleed on the surface of the hot melt material 10.

When the main component of the hot melt material 10 is a thermoplastic elastomer, an antioxidant, a tackifying resin, an inorganic filler, an amorphous polyalphaolefin, a wax, or the like may be added as an additive other than the main component. it can.

The antioxidant can prevent the aging of the hot melt material 10 and improve the tasteless and odorless safety and hygiene. Examples of the antioxidant include a phenolic antioxidant, a phosphite antioxidant, a sulfur antioxidant, and an antioxidant of a hydroquinone derivative. These may be used alone or in combination of two or more. The content of the antioxidant is preferably 0.01 to 5 parts by mass, and more preferably 0.1 to 3 parts by mass. If the content of the antioxidant is too small, the deterioration due to heating at the time of manufacturing the hot melt material 10 is severe, and the problem of discoloration or off-flavor tends to occur. Even if the content of the antioxidant exceeds 3 parts by mass, there is almost no effect accompanying an increase in the amount added, and if it exceeds 5 parts by mass, bleeding may occur and the appearance may deteriorate.

Examples of the tackifying resin include rosin resins such as gum rosin, tall oil rosin, wood rosin, hydrogenated rosin, disproportionated rosin, polymerized rosin, glycerin esters thereof, and rosin esters such as pentaerythritol ester; α-pinene Terpene resins such as terpene resins, aromatic terpene resins, hydrogenated terpene resins, terpene phenol resins, etc. (hydrogenated) aliphatic (C5) petroleum resins, (hydrogenated) ) Hydrogen such as aromatic (C9) petroleum resin, (hydrogenated) copolymerized (C5-C9 copolymerized) petroleum resin, (hydrogenated) dicyclopentadiene petroleum resin, alicyclic saturated hydrocarbon resin, etc. Petroleum resin which may be added; poly α-methylstyrene, α-methylstyrene-styrene copolymer, styrene monomer-aliphatic Styrenic resins such as nomer copolymers, styrene monomers-α-methylstyrene-aliphatic monomer copolymers, styrene monomers-aromatic monomers (excluding styrene monomers) copolymers; phenolic resins Xylene resin; synthetic resin such as coumarone-indene resin. These may be used alone or in combination of two or more. Among these, from the viewpoint of suppressing coloring of the thermoplastic elastomer composition, hydrogenated terpene resins, alicyclic saturated hydrocarbon resins, and (hydrogenated) aliphatic (C5) petroleum resins are preferable. When the tackifying resin is added, the content is preferably 160 parts by mass or less from the viewpoint of preventing pain when the mask is removed from the face because the adhesive force is too strong, and 110 parts by mass. Part or less is more preferable.

The inorganic filler can suppress stringing from the nozzle when the hot melt material 10 is applied, and can further improve the deodorizing effect and the like. Examples of the inorganic filler include zeolite, calcium carbonate, talc, carbon black, titanium oxide, silica, clay, barium sulfate, magnesium carbonate, glass fiber, and carbon fiber. In the case of adding an inorganic filler, the content is preferably 100 parts by mass or less, more preferably 50 parts by mass or less from the viewpoint of preventing the viscosity from being too high and hindering the application of the hot melt material 10. preferable.

Amorphous polyalphaolefin improves the adhesion between the hot melt material 10 and the non-woven fabric that is the mask substrate. In the case of adding amorphous polyalphaolefin, the content is preferably 100 parts by mass or less, more preferably 80 parts by mass or less from the viewpoint of preventing the compatibility from being deteriorated.

Examples of the wax include natural waxes derived from petroleum such as paraffin wax and microcrystalline wax, and synthetic waxes such as Fischer-Tropsch wax and polyethylene wax. These may be used alone or in combination of two or more.

The A hardness of the hot melt material 10 is less than 50, preferably 48 or less, and more preferably 30 or less. Although the minimum of A hardness is not specifically limited, One or more are preferable. Here, the A hardness can be measured according to the description of JIS K6301-1975. The A hardness is obtained by using a durometer (spring type rubber hardness tester) that measures the amount of deformation (indentation depth) by pressing an indenter into the surface of a non-measurement object, and measures the amount of deformation (indentation depth). When the A hardness is less than 50, the wearing sealability with the face is high, the glasses are not easily fogged, the adhesion with the face is good, the mask itself is difficult to shift up and down, and the adhesive is not too strong when removing the mask. It is difficult to feel discomfort such as pain, and release paper can be omitted, and a mask with particularly good folding workability can be obtained at low cost. When the mask 1 is brought into close contact with the face, the nose fitter portion is bent along the nose 22, but if the hot melt material 10 is too hard, it is difficult to bend, and if the A hardness is less than 50, the hot melt material 10 is also Can be folded easily. A hardness of less than 50 and moderate softness makes it easy to deform along the face shape due to the softness, improving the fit to the face, and even if the shear shear strength, which is an index of adhesiveness, is reduced, the face Fits well and has good adhesion, so it can be attached to the face without feeling a sense of discomfort, especially pain, with the adhesiveness of the tackifier, etc. It becomes. As a result, when a plurality of masks 1 are stacked and packaged, a release paper is not required to prevent adhesion caused by the hot melt material 10.

The hot melt material 10 preferably has a shear shear strength measured by pressing a polypropylene (PP) sheet of 450 g / 5 mm or less, more preferably 10 g / 5 mm or more and 300 g / 5 mm or less, and even more preferably less than 100 g / 5 mm. It is. When the adhesive strength (adhesion strength) is in such a range, the fit with the face when the mask 1 is worn is improved without feeling the pain of the skin when the mask 1 is removed. be able to. As shown in the examples below, the shear shear strength was obtained by coating the hot melt material 10 with a width of 5 mm and a length of 150 mm, and after 1 day at room temperature, a polypropylene sheet was pressure-bonded thereon and sheared in the longitudinal direction. Measure shear strength. The polypropylene sheet is not particularly limited as long as it has a flat surface. Among them, a hard sheet can be used. For example, Sekisui Material Solutions Co., Ltd., trade name: Polyceme P8134 Natural can be used as a commercial product. The thickness of the hot melt material 10 is, for example, 1 to 3 mm.

In the present invention, a low A hardness improves the nose part bendability, and even with the above shear shear strength, the adhesion is good and the ease of removal (reducing skin pain) is improved. Adhesiveness can be made favorable. Further, even if the masks are stacked after application and cooling, they are not adhered to such an extent that they are not peeled off, and the hot melt materials are not easily stuck together, so that it is not necessary to attach release paper.

The melt viscosity of the hot melt material 10 is a value measured with a Brookfield viscometer and is 180,000 mPa · s or less at 190 ° C., preferably 150,000 mPa · s or less. When the melt viscosity is less than 180,000 mPa · s, when the hot melt material 10 is applied to the inner surface 6 of the mask 1 with a hot melt gun, the switch that discharges the hot melt material 10 from the hot melt gun in the last step of application After turning OFF, the sharpness at the tip of the discharge nozzle of the hot melt gun is good and it is easy to suppress the occurrence of stringing from the tip of the discharge nozzle. As a result, workability is improved, and deterioration of the product appearance due to the remaining yarn drawing portion can be suppressed. When the melting temperature of the hot melt material 10 or the temperature of the discharge nozzle is increased, the base material of the mask 1 is likely to be melted. Therefore, it is necessary to select the melting temperature depending on the material of the mask 1, but for example, made of polypropylene (PP) In the case of the mask 1, it is preferable to apply the hot melt material 10 at a discharge temperature of 190 ° C. or lower.

Since the hot melt material 10 can form an elastic body without using a drying oven in the normal manufacturing process of the mask 1, the application process of the hot melt material 10 is performed without changing the manufacturing process. Can be easily incorporated into the manufacturing process.

When the hot melt material 10 provided on the inner surface 6 of the mask 1 is foamed, the contact portion with the face 21 is more easily deformed along the shape of the face 21 and the fit is improved. From the viewpoint of the fit with the face 21 and the restorability, the foaming ratio of the hot melt material 10 is preferably 4 times or less, more preferably 1 to 4 times, and even more preferably 2 to 4 times. By foaming the hot melt material 10, the coating volume can be increased, and the contact portion with the face is more easily deformed along the shape and the fit is improved, but if the expansion ratio becomes too high, the hot melt gun When it is discharged from the liquid, bubbles are easily broken and defects such as intermittent application are likely to occur. Moreover, the unevenness | corrugation of the hot-melt surface becomes remarkable, and restoration property becomes low.

In order to foam the hot-melt material 10, a foaming agent is used as an additive, or the hot-melt material 10 is heated and melted, and inactive in air, carbon dioxide, nitrogen or the like while being pressurized in a tank. The hot melt-gas mixed melt in a pressurized state may be applied under atmospheric pressure with a hot melt gun or the like by mixing a gas. However, in consideration of thermal deterioration while the material is melted, nitrogen is used as an inert gas. It is preferable to mix gas.

Since the mask 1 of the present embodiment is provided with such a hot melt material 10, when the mask 1 is mounted on the face 21, the hot melt material 10 comes into contact with the face 21 and the mask 1 and the face 21. The gap can be filled.

In the mask 1 of this embodiment, the hot melt material 10 is bonded to the nonwoven fabric in the vicinity of the peripheral edge 4 on the inner surface 6 of the mask 1.

More specifically, the hot melt material 10 is linearly provided in the vicinity of the upper end 4 a in the vicinity of the peripheral edge 4 of the inner surface 6 of the mask 1.

The hot melt material 10 linearly provided in the vicinity of the upper end 4a of the peripheral edge 4 is provided with two upper end

thick portions

11 and 11 that fit on both sides of the nose 22 and a constricted portion 12 between them. On the opposite side of the

thick portions

11 and 11 from the constricted portion 12, upper

thin portions

14 and 14 are linearly provided toward the side ends 4c and 4d, respectively.

These upper-end-side

thick portions

11, 11, the constricted portion 12, and the upper-end-side

thin portions

14, 14 are entirely linear in parallel with the vicinity of the upper end 4 a of the mask 1.

The upper-end-side

thick portions

11, 11 are provided in the vicinity of the central portion in the vicinity of the upper-end 4 a of the inner surface 6 of the mask body 2, have a thick and bulging shape, and are arranged on the outer side of the pleat portion 7 with the two upper-end-side thick portions 11. , 11 are provided symmetrically. When the mask main body 2 is drawn to the face 21 by the ear straps 3 and 3 due to the thick and bulging shape, the two upper end

thick portions

11 and 11 are formed on the sides of the nose 22 as shown in FIG. Hold it. Thereby, the hot-melt material 10 fits and closely adheres to the vicinity of the nasal column and cheeks. When the mask 1 is attached to the face 21, the upper end side

thick portions

11, 11 can fill the gap between the mask body 2 and the face 21 generated on both sides of the nose 22 with a thick and bulging shape. . Therefore, the sealing performance with the face 21 is high, and it is possible to prevent the exhalation from leaking from both sides of the nose 22 and fogging of the glasses.

The constricted portion 12 and the upper-side

thin portions

14 and 14 are also fitted in contact with the face 21 on the upper side of the mask 1, and are formed into a linear shape having a smaller thickness than the upper-end

thick portions

11 and 11. A gap between the main body 2 and the face 21 can be filled.

Thus, when the mask 1 of the present embodiment is mounted on the face 20, the thickness of the hot melt material 10 changes according to the size of the gap generated between the mask 1 and the face 21. That is, depending on the size of the gap, the thickness (application amount) when the hot melt material 10 is applied as a coating material can be partially changed. Thereby, mounting | wearing sealing performance with the face 21 can be improved.

Next, a method for manufacturing the mask 1 of this embodiment will be described.

A general hot melt gun can be used for applying the hot melt material 10 as a coating material. For example, by moving the hot melt gun for coating to an arbitrary position on the mask 1 with the X-axis, Y-axis, and Z-axis by a three-axis movable robot, or arbitrarily changing the moving speed of the hot-melt gun depending on the position The coating amount can be changed for each position relative to the inner surface 6 of the mask body 2. Thereby, it can apply | coat three-dimensionally, changing thickness and a shape according to each position of the upper end side

thick part

11,11, the narrow part 12, and the upper end side

thin part

14,14.

FIG. 4 is a flowchart showing an example of a process for manufacturing the mask 1 of the present embodiment.

The flowchart in FIG. 4 is based on the manufacturing process of a general pleated disposable mask. A plurality of non-woven fabrics used for the mask body 2 are continuously unwound from a long sheet-like non-woven fabric, and are laminated and bonded together (S1). Next, a resin piece such as polyethylene that fits the nose 22 or a metal piece (nose fitter) is joined to the laminated nonwoven fabric, and the nonwoven fabric is turned over so that the resin piece or metal piece contacts the nose 22 of the mask 1. Is folded to the upper end 4a side (S2).

Next, pleats are formed in the lateral direction using a pleating machine (S3). As for the nonwoven fabric conveyed to the pleating machine, the grooves forming the pleats are folded by the metal fittings of the pleating machine, and further pressed and strongly folded.

Next, the edge covering (S4) and cut cutting (S5) of the upper end 4a and the lower end 4b of the mask body 2, edge covering (S6), cut cutting (S7), edge processing (S7) on both

sides

4c and 4d of the mask body 2 ( Through each step of S8). In these steps, the periphery of the mask body 2 made of a laminated body in which a plurality of nonwoven fabric sheets are superimposed is fixed and reinforced, and the nonwoven fabric laminated body is cut into the shape of the mask body 2.

Then, it is applied to the mask body 2 while cutting the ear straps 3 and 3 (S10). Application of the hot melt material 10 to the inner surface 6 of the mask body 2 (S9) can be performed, for example, immediately before or immediately after the step S10 of attaching the ear straps 3 and 3. The hot melt material 10 is applied by applying the hot melt material 10 as a coating material to the inner surface 6 of the mask body 2 with a hot melt gun.

The application step S9 of the hot melt material 10 can be applied to the inner surface 6 after the ear straps 3 and 3 are welded and a normal mask is once manufactured (R2), but the ear straps 3 and 3 are welded. Application in the immediately preceding process (R1) is desirable from the standpoint that coating on the production line of the mask 1 is easy and that the coating apparatus can be easily incorporated.

After that, the manufactured mask 1 is shipped as a product after inspection (S11) and boxing (S12) such as dirt, distortion, and ear strap welding failure.

According to the mask 1 of the present embodiment described above, by setting the A hardness of the hot melt material 10 to less than 50, the wearing sealability with the face is high, the glasses are not easily fogged, and the adhesion with the face is good. Thus, the mask itself is difficult to shift up and down, and the adhesiveness is not too strong, and it is difficult to feel discomfort such as pain when removing the mask, so that the release paper can be omitted, and a mask with particularly good folding workability can be obtained at low cost. Use of a thermoplastic elastomer as the hot-melt material 10 is suitable for manifesting these effects.

Further, according to the mask 1 of the present embodiment, the hot melt material 10 is provided which is bonded to the nonwoven fabric in the vicinity of the peripheral edge 4 of the inner surface 6 of the mask 1 and comes into contact with the face 21 when the mask 1 is attached to the face 21. . The hot melt material 10 is linearly provided in the vicinity of the upper end 4 a in the vicinity of the peripheral edge 4 of the inner surface 6 of the mask 1. In particular, it is continuously provided in the vicinity of the upper end 4 a in the vicinity of the peripheral edge 4 of the inner surface 6 of the mask 1 in a range where it contacts both sides of the nose 22. Therefore, the wearing and sealing performance with the face 21 is high, and the breathing that leaks from a place close to both sides of the nose 22 does not cause fogging of the glasses in winter, and the troublesomeness caused by fogging of the glasses is eliminated. Furthermore, the adhesiveness with the face 21 is good and the mask 1 itself is not easily displaced up and down.

Further, since the mask 1 is a non-woven fabric, the edge surface is hard, and if it is rubbed at a portion that contacts the face 21, it may be irritated or painful for a person sensitive to the skin, but the hot melt material 10 applied to the inner surface 6 Since the surface touches the skin directly, it is difficult to rub the surface of the skin with the surface or edge of the nonwoven fabric.

Furthermore, since it can be manufactured simply by applying the hot melt material 10 to a commonly used mask, compared to the case where a foamed sheet is punched out and pasted with an adhesive in a subsequent process as in a conventional nose cushion. There are few extra steps and it can be manufactured at low cost.
(Second Embodiment)
FIGS. 5A to 5D are views for explaining an embodiment of the mask manufacturing method of the present invention.

In this embodiment, when the hot melt material 10 is applied to the inner surface 6 of the mask 1 with the hot melt gun 30, the switch for discharging the hot melt material 10 of the hot melt gun 30 is turned off in the last step of application. Thereafter, the discharge nozzle tip 30 a of the hot melt gun 30 is brought into contact with the inner surface 6 of the mask 1 in the vicinity of the application end of the hot melt material 10.

As shown in the front view seen from the side of the mask in FIG. 5A, the hot-melt material 10 heated and melted is applied to the inner surface 6 of the mask body 2 and applied at the last step of application with the hot-melt gun 30. In the position A, the switch for discharging the hot melt material 10 of the hot melt gun 30 is turned off. At this time, as shown in FIG. 5B, depending on the viscosity of the hot-melt material 10 heated and melted, the stringing 10a of the hot-melt material 10 may occur at the discharge nozzle tip 30a. When the hot melt gun 30 is moved, the thread drawing 10a adheres irregularly to the surroundings and impairs the appearance.

Therefore, in the present embodiment, as shown in the top view of FIG. 5C (the hot melt gun 30 is not shown) and the front view of the mask shown in FIG. In the last step of application with the gun 30, after the switch for discharging the hot melt material 10 of the hot melt gun 30 is turned off, the application end of the hot melt material 10 (in FIG. 5A to FIG. 5D, the switch The discharge nozzle tip 30a is instantaneously brought into contact with the non-woven fabric on the inner surface 6 of the mask body 2 at a position B in the vicinity of the position A. Here, the vicinity of the application end of the hot melt material 10 is, for example, a range in which the distance from the application end (position A) to the position B is within 7 mm. The hot melt gun 30 is not limited to being discharged and applied to the mask body 2 downward, but may be applied upward by being discharged upward to the mask body 2.

According to the mask manufacturing method of the present embodiment described above, the inner surface of the mask main body 2 is located at the position B near the application end of the hot melt material 10 even if the stringing 10a occurs at the discharge nozzle tip 30a. The stringing 10a can be made to adhere by contacting the specific location of the nonwoven fabric 6, and the appearance of the mask 1 can be improved. Furthermore, by bringing the discharge nozzle tip 30a into contact with the nonwoven fabric of the inner surface 6 of the mask body 2, the stringing 10a is removed from the discharge nozzle tip 30a, so that the discharge nozzle tip 30a can always be cleaned and the nozzle tip can be cleaned. Build-up (hot melt deposition) can be prevented.
(Third embodiment)
6 to 8 show another embodiment of the mask of the present invention. In addition, the same code | symbol is attached | subjected to the part which is common in the said 1st Embodiment, and detailed description is abbreviate | omitted.

In the mask 1 of this embodiment, as shown in FIG. 6, two upper end

thick portions

11 and 11 that fit on both sides of the nose 22 and a constricted portion 12 between them are provided in the vicinity of the upper end 4 a of the peripheral edge 4. Provided on the opposite side of the upper

thick portion

11, 11 from the constricted portion 12, upper

thin portions

14, 14 are linearly provided toward the side ends 4 c, 4 d, respectively.

The upper end

thick portions

11 and 11, the constricted portion 12, the upper end

thin portions

14 and 14 are centered on the constricted portion 12, and the upper end thick portion 11 and the upper end thin portion 14 are slightly inclined from both sides. It has a mountain shape when viewed from above.

In the vicinity of the side edges 4 c and 4 d of the peripheral edge 4, side end side

thick portions

13 and 13 that fit on both cheek sides of the face 21 are continuous from the outer ends of the upper end side

thin portions

14 and 14. 4c and 4d are provided linearly in parallel.

In the vicinity of the lower end 4b of the peripheral edge 4, the lower end side thin portion 15 that fits the jaw side of the face 21 is continuous from the lower ends of the side end side

thick portions

13 and 13 and is inclined slightly downward. It is provided in the shape.

The upper-end-side

thick portions

11 and 11 are provided in the vicinity of the central portion in the vicinity of the upper end 4a of the inner surface 6 of the mask body 2, and have a swelled shape with a thickness so as to be slightly inclined toward the side ends 4c and 4d. Two upper-end-side

thick portions

11, 11 are provided on the outer side of 7 so as to be symmetric. When the mask main body 2 is drawn to the face 21 by the ear straps 3 and 3 due to the thick and bulging shape, the two upper end

thick portions

11 and 11 are formed on both sides of the nose 22 as shown in FIG. Hold it. Thereby, the hot-melt material 10 fits and closely adheres to the vicinity of the nasal column and cheeks. When the mask 1 is attached to the face 21, the upper end side

thick portions

11, 11 can fill the gap between the mask body 2 and the face 21 generated on both sides of the nose 22 with a thick and bulging shape. . Therefore, the sealing performance with the face 21 is high, and it is possible to prevent the exhalation from leaking from both sides of the nose 22 and fogging of the glasses. Moreover, the suction | inhalation of viruses, such as a cold, pollen, dust, dust, etc. from the upper side of the mask 1 can be suppressed, and the person etc. who suffered from a cold are hard to disperse a virus.

The constricted portion 12 and the upper-side

thin portions

thick portions

11 and 11. A gap between the main body 2 and the face 21 can be closed.

As shown in FIG. 8, the side end side

thick portions

13 and 13 are fitted to both cheek sides of the face 21 when the mask 1 is attached to the face 21, as shown in FIG. And the face 21 can be filled. Therefore, the sealing performance with the face 21 is high, and suction of viruses such as colds, pollen, dust, dust and the like from the side as well as the upper side of the mask 1 can be suppressed.

The lower end side thin portion 15 also fits in contact with the jaw side of the face 21 on the lower side of the mask 1, and is a line having a smaller thickness than the upper end side

thick portions

11, 11 and the side end side

thick portions

13, 13. By forming the shape, the gap between the mask body 2 and the face 21 can be filled.

The mask 1 of the present embodiment is a pleated mask 1, and the hot melt material 10 (side end side thick portions 13 and 13) provided linearly in the vicinity of the side ends 4c and 4d is a pleat fold portion 7a. It is provided not to cross ˜7d.

Here, “do not cross” means that the pleat crease portions 7a to 7d are formed by folding back the mask body 2, and when the mask body 2 is expanded in the vertical direction and the pleat portion 7 is expanded, the mask body 2 Is formed so as not to cross the pleat folds 7a to 7d as long as the mask main body 2 does not hinder the outward expansion. Means that Accordingly, the hot melt material 10 is allowed to overlap the side ends 4c and 4d of the pleat folds 7a to 7d as long as the mask body 2 does not hinder the outward expansion of the mask body 2.

That is, when the hot melt material 10 is applied as a coating material, it is coated with an application pattern that avoids application across the adjacent pleat crease portions 7a to 7d. Thereby, when the pleat part 7 is expanded, it is possible to prevent the pleat part 7 from spreading.

The hot melt material 10 can be applied to the mask 1 of the present embodiment using a hot melt gun, as in the first embodiment. For example, by moving the hot melt gun for coating to an arbitrary position on the mask 1 with the X-axis, Y-axis, and Z-axis by a three-axis movable robot, or arbitrarily changing the moving speed of the hot-melt gun depending on the position The coating amount can be changed for each position relative to the inner surface 6 of the mask body 2. Thereby, thickness and shape are changed according to each position of upper end side

thick parts

11, 11, constricted part 12, side end side

thick parts

13, 13, upper end side

thin parts

14, 14, and lower end side thin part 15. Can be applied three-dimensionally.

Further, according to the mask 1 of the present embodiment, the hot melt material 10 is provided which is bonded to the nonwoven fabric in the vicinity of the peripheral edge 4 of the inner surface 6 of the mask 1 and comes into contact with the face 21 when the mask 1 is attached to the face 21. . In particular, it is continuously provided in the vicinity of the upper end 4 a in the vicinity of the peripheral edge 4 of the inner surface 6 of the mask 1 in a range where it contacts both sides of the nose 22. Further, the hot melt material 10 is provided in a linear form at least near the upper end 4a and near the side edges 4c and 4d in the vicinity of the peripheral edge 4 of the inner surface 6 of the mask 1. Therefore, the gap between the mounting portion and the face 21 can be made as small as possible. Therefore, it is possible to significantly reduce the risk of sucking a cold virus, pollen, dust, dust, etc. from the gap, and the risk of a person having a cold scattering the virus. In addition, the sealing performance with the face 21 is high, and the breathing that leaks out from both sides of the nose 22 prevents the glasses from being fogged, especially in winter, so that the troublesomeness caused by the fogging of the glasses is eliminated. Furthermore, the adhesiveness with the face 21 is good and the mask 1 itself is not easily displaced up and down.

Furthermore, since it can be manufactured simply by applying the hot melt material 10 to a commonly used mask, compared to the case where a foamed sheet is punched out and pasted with an adhesive in a subsequent process as in a conventional nose cushion. There are few extra steps and it can be manufactured at low cost. When applied to the entire circumference, the sealing performance is improved, and therefore, it is also suitable for use in applications where sealing performance is required.
(Fourth embodiment)
FIG. 9 shows another embodiment of the mask of the present invention. In addition, the same code | symbol is attached | subjected to the part which is common in the said 1st Embodiment, and detailed description is abbreviate | omitted.

In the mask 1 of this embodiment, the hot melt material 10 is linearly provided in the vicinity of the upper end 4a in the vicinity of the peripheral edge 4 of the inner surface 6 of the mask 1.

In the vicinity of the upper end 4 a of the peripheral edge 4, two upper-end-side

thick portions

11, 11 that fit on both sides of the nose 22 and a constricted portion 12 therebetween are provided, and the constricted portion 12 of the upper-end-side

thick portions

11, 11 is provided. On the opposite side, the upper end side

thin portions

14, 14 are linearly provided toward the side ends 4c, 4d, respectively.

The upper end

thick portions

11 and 11, the constricted portion 12, the upper end

thin portions

The upper-end-side

thick portions

11, 11 are provided on the outer side of 7 so as to be symmetric. When the mask main body 2 is drawn to the face 21 by the ear straps 3 and 3 due to the thick and bulging shape of the two upper end

thick parts

11 and 11, the hot melt material 10 is the same as that of the first embodiment. Similarly, both sides of the nose 22 are sandwiched. Thereby, the hot-melt material 10 fits and closely adheres to the vicinity of the nasal column and cheeks. When the mask 1 is attached to the face 21, the upper end side

thick portions

11, 11 can fill the gap between the mask body 2 and the face 21 generated on both sides of the nose 22 with a thick and bulging shape. .

Furthermore, since it can be manufactured simply by applying the hot melt material 10 to a commonly used mask, compared to the case where a foamed sheet is punched out and pasted with an adhesive in a subsequent process as in a conventional nose cushion. There are few extra steps and it can be manufactured at low cost.
(Fifth embodiment)
FIG. 10 shows another embodiment of the mask of the present invention. In addition, the same code | symbol is attached | subjected to the part which is common in the said 1st Embodiment, and detailed description is abbreviate | omitted.

The hot melt material 10 forms a straight line having a uniform width and a uniform thickness as a whole in parallel with the vicinity of the upper end 4a of the mask 1. The hot melt material 10 is provided in substantially the entire range along the upper end 4a from the vicinity of the side end 4c of the inner surface 6 to the vicinity of the side end 4d, that is, from the vicinity of the fixing portion 5c to the vicinity of the fixing portion 5d.

When the mask main body 2 is drawn to the face 21 by the ear straps 3 and 3, the hot melt material 10 sandwiches both sides of the nose 22 as in the first embodiment. Thereby, the hot-melt material 10 fits and closely adheres to the vicinity of the nasal column and cheeks. For example, if the surface of the hot melt material 10 has a weak adhesive force, the mask 1 can be brought into close contact with the face 21 with a slight adhesive force, so that the gap between the face 21 and the mask body 2 is reduced. The space between the face 21 can be filled.

As in the first, third, and fourth embodiments, when the hot melt material 10 is applied as a coating material, the thickness (application amount) is partially changed so that the mask 1 is attached to the face 20. If the thickness of the hot melt material 10 is changed according to the size of the gap generated between the face 21 and the face 21, it is possible to further improve the wearing sealing performance with the face 21 as in the present embodiment. Even if the hot-melt material 10 has a linear shape with a uniform width and a uniform thickness, it is possible to ensure a tight seal with the face 21 and to prevent the exhalation from leaking from both sides of the nose 22 and clouding of the glasses. Furthermore, the adhesiveness with the face 21 is good and the mask 1 itself is not easily displaced up and down. Further, in this case, since it is a simple linear shape, the production speed can be increased as compared with the first, third, and fourth embodiments.

FIG. 11 is a modification of the present embodiment. This mask 1 is similar to FIG. 10 in that the hot melt material 10 is linearly provided in the vicinity of the upper end 4a in the vicinity of the peripheral edge 4 of the inner surface 6 of the mask 1, and in the entire range along the upper end 4a. The hot melt material 10 is provided only in the range including the central portion that contacts the nose 22. Even in such a modified example, the hot-melt material 10 provided in the central portion in contact with the nose 22 can secure the sealing with the face 21, and the exhalation leaks from both sides of the nose 22 and the glasses become cloudy. Can be prevented. Furthermore, the adhesiveness with the face 21 is good and the mask 1 itself is not easily displaced up and down. The coating amount can be reduced, the cost can be reduced, and the production speed can be increased.
(Sixth embodiment)
FIG. 12 shows another embodiment of the mask of the present invention. In addition, the same code | symbol is attached | subjected to the part which is common in the said 1st Embodiment, and detailed description is abbreviate | omitted.

In the mask 1 of the present embodiment, two hot melt materials 10 are linearly provided in the vicinity of the upper end 4a in the vicinity of the peripheral edge 4 of the inner surface 6 of the mask 1 and parallel to each other.

The two hot melt materials 10 form a straight line having a uniform width and a uniform thickness as a whole in parallel with the vicinity of the upper end 4a of the mask 1.

When the mask body 2 is attracted to the face 21 by the ear straps 3 and 3, the two hot melt materials 10 sandwich both sides of the nose 22 as in the first embodiment. Thereby, the two hot-melt materials 10 fit and closely adhere to the vicinity of the nasal column and cheeks. For example, if there are weak adhesive forces on the surfaces of the two hot melt materials 10, the mask 1 can be brought into close contact with the face 21 with a slight adhesive force, so the gap between the face 21 and the mask body 2 is reduced. The space between the mask 1 and the face 21 can be filled.

As in the first, third, and fourth embodiments, when the hot melt material 10 is applied as a coating material, the thickness (application amount) is partially changed so that the mask 1 is attached to the face 20. If the thickness of the hot melt material 10 is changed according to the size of the gap generated between the face 21 and the face 21, it is possible to further improve the wearing sealing performance with the face 21 as in the present embodiment. Even if the hot-melt material 10 has a linear shape with a uniform width and a uniform thickness, it is possible to ensure a tight seal with the face 21 and to prevent the exhalation from leaking from both sides of the nose 22 and clouding of the glasses. Furthermore, the adhesiveness with the face 21 is good and the mask 1 itself is not easily displaced up and down. In this case, since it is a simple linear shape, it is the fifth embodiment that the production speed can be increased by applying two simultaneously with a hot melt gun as compared with the first, third and fourth embodiments. It is the same as the form.
(Seventh embodiment)
FIG. 13 shows another embodiment of the mask of the present invention. In addition, the same code | symbol is attached | subjected to the part which is common in the said 1st Embodiment, and detailed description is abbreviate | omitted.

The mask 1 of this embodiment is a so-called disposable “three-dimensional”, and has mask

main bodies

2a and 2b on the left and right sides from the central portion, and the mask

main bodies

2a and 2b can be folded using the central portion as a fold. It is said that. When the left and

right mask bodies

2a and 2b in a folded state are spread as shown in FIG. 13, a bowl-shaped three-dimensional shape is obtained.

The mask 1 includes a mask body 2 composed of left and

right mask bodies

2a and 2b, and ear hooks 30 and 30 attached in the vicinity of both side ends 4c and 4d of the mask body 2.

The inner surface 6 of the mask body 2 is provided with a hot melt material 10 linearly along the vicinity of the upper end 4a, the lower end 4b, and the side ends 4c and 4d.

According to the mask 1 of the present embodiment, by setting the A hardness of the hot melt material 10 to less than 50, the wearing sealability with the face is high, the glasses are not easily fogged, the adhesion with the face is good, and the mask itself is good. It is difficult to shift up and down, and the adhesiveness is not too strong. When removing the mask, it is difficult to feel discomfort such as pain, and the release paper can be omitted, and a mask with particularly good folding workability can be obtained at a low cost. Use of a thermoplastic elastomer as the hot-melt material 10 is suitable for manifesting these effects.

Further, even if the hot melt material 10 is provided in a single linear shape across the left and

right mask bodies

2a, 2b so as to continuously fit on both sides of the nose 22, the A hardness of the hot melt material 10 is less than 50. Therefore, there is little resistance at the time of bending and the processability of folding is favorable. The three-dimensional mask 1 is usually packaged and sold with the

mask bodies

2a and 2b of the mask 1 folded at the center, but if the A hardness is less than 50, the hot melt material 10 can be easily obtained. Can be folded. In addition, by making the A hardness less than 50 and having an appropriate softness, the softness easily deforms along the face shape, thereby improving the fit to the face and reducing the shear shear strength, which is also a stickiness index. Since it fits on the face and has good adhesion, it fits on the face and improves adhesion without feeling uncomfortable, particularly painful, with the adhesiveness of the tackifier. As a result, when a plurality of masks 1 are stacked and packaged, a release paper is not required to prevent adhesion caused by the hot melt material 10. In other words, even when the three-dimensional mask is folded, it does not stick to the adhesive between the hot melt materials 10, and after the hot melt material is applied and cooled, it can be folded and stacked as it is, and there is no step of attaching release paper, simplifying the manufacturing process. Can be

Further, according to the mask 1 of the present embodiment, the hot melt material 10 is provided which is bonded to the nonwoven fabric in the vicinity of the peripheral edge 4 of the inner surface 6 of the mask 1 and comes into contact with the face 21 when the mask 1 is attached to the face 21. . In particular, it is continuously provided in the vicinity of the upper end 4 a in the vicinity of the peripheral edge 4 of the inner surface 6 of the mask 1 in a range where it contacts both sides of the nose 22. Further, the hot melt material 10 is linearly provided over the entire circumference at least near the upper edge 4a, near the lower end 4b, and near the side edges 4c and 4d in the vicinity of the peripheral edge 4 of the inner surface 6 of the mask 1. Therefore, the gap between the mounting portion and the face 21 can be made as small as possible. Therefore, it is possible to significantly reduce the risk of sucking a cold virus, pollen, dust, dust, etc. from the gap, and the risk of a person having a cold scattering the virus. In addition, the sealing performance with the face 21 is high, and the breathing that leaks out from both sides of the nose 22 prevents the glasses from being fogged, especially in winter, so that the troublesomeness caused by the fogging of the glasses is eliminated. Furthermore, the adhesiveness with the face 21 is good and the mask 1 itself is not easily displaced up and down.

Furthermore, since it can be manufactured by simply applying the hot melt material 10 to a commonly used three-dimensional mask, when foamed sheets are punched out and pasted with an adhesive in a subsequent process like a nose cushion of the prior art Compared with fewer extra steps, it can be manufactured at low cost.

As mentioned above, although embodiment of this invention was described, this invention is not limited to these embodiment at all, and various changes are possible in the range which does not deviate from the summary.

For example, in the above-described embodiment, the pleated and three-dimensional disposable mask 1 is shown as an example, but the present invention can be applied to other masks.

Further, the shape and thickness of the hot melt material 10 in each part of the inner surface 6 of the mask main body 2 can be appropriately determined in consideration of the sealing performance of the gap between the mask 1 and the face 21, for example, sealing It is possible to increase the thickness of the weak part.

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples. However, the present invention is not limited to these examples.
<Example 1>
As a hot melt material, synthetic rubber hot melt adhesive “Imelt PA-14B (melt viscosity at 170 ° C .: 1600 mPa · s)” marketed by Daihyo Co., Ltd. is melted at 170 ° C. to form a hot melt gun. Then, it was applied to the inner surface of a commercially available pleated mask to produce a mask as shown in FIG.

When this mask's ear strap is worn on the face and attached to the face, the hot melt material fits the face, the gap between the face and the mask body is small, and the mask and the face can be blocked from outside air. It was. In addition, sighs were not leaked from near the sides of the nose and the glasses were not clouded. The shear shear strength measured by the method described later was less than 100 g / 5 mm, and no particular pain was felt when removing the mask.
<Example 2>
As a hot melt material, a synthetic rubber hot melt adhesive “Imelt PA-41 (melt viscosity at 170 ° C .: 1700 mPa · s)” commercially available from Daihyo Co., Ltd. is melted at 170 ° C. to form a hot melt gun. Then, it was applied to the inner surface of a commercially available pleated mask to produce a mask as shown in FIG.

When the ear straps of this mask are put on the ear and attached to the face, the hot melt material fits the face, and this hot melt material has a weak adhesive force on the surface, with a slight adhesive force at the contact area with the face. Since the mask could be brought into close contact, the gap between the face and the mask body was small, and the space between the mask and the face could be blocked from outside air. Moreover, although the sighs were not leaked from near the sides of the nose and the glasses were not clouded, the following shear shear strength, which is an index of adhesive strength, was 510 g / 5 mm. There was a feeling of pulling the skin.
<Examples 3 to 27, Comparative Examples 1 to 3, Reference Example 1>
Masks were manufactured using the hot melt materials shown in Table 1 and Table 2, and the following evaluation was performed.

The raw materials for the hot melt material were as follows.
Thermoplastic elastomer A: SEBS, styrene content 30%, MFR (g / 10 min) (230 ° C./5 kg): 5, specific gravity 0.91, 10% toluene solution viscosity (mPa · s, 25 ° C.): 30
Thermoplastic elastomer B: SEBS, styrene content 31%, MFR (g / 10 min) (230 ° C./2.16 kg): <0.1, specific gravity 0.91, 10% viscosity in toluene solution (mPa · s, 30 ° C): 40
Thermoplastic elastomer C: SEPS, styrene content 30%, MFR (g / 10 minutes) (230 ° C./2.16 kg): 70, specific gravity 0.91, 15% toluene solution viscosity (mPa · s, 30 ° C.): 25
Thermoplastic elastomer D: SEPS, styrene content 65%, MFR (g / 10 min) (230 ° C./2.16 kg): 0.4, specific gravity 0.98, 15% toluene solution viscosity (mPa · s, 30 ° C. ): 23
Softener: Petroleum hydrocarbon, odorless colorless transparent liquid, flash point 250 ° C, density 0.868g / cm ³ (15 ° C), pour point -12.5 ° C, insoluble in water (20 ° C), kinematic viscosity 40 ° C mm ^{2 / s (} cSt): 67.65, average molecular weight 483
Antioxidant: Phenolic antioxidant: Pentaerythritol tetrakis "3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate"
Wax: low molecular weight polypropylene resin: softening point 152 ° C., specific gravity 0.89 (20 ° C.), viscosity: 200 mPa · s (160 ° C.)
Silicone oil: polydimethylsiloxane, density 0.97g / ^cm 3/25 ℃, viscosity 350mPa · s / 25 ℃ (Test Method: DIN 53019)
Tackifying resin A: alicyclic saturated hydrocarbon resin Softening point (ring and ball method) 90 ° C
Tackifying resin B: alicyclic saturated hydrocarbon resin Softening point (ring and ball method) 125 ° C
Amorphous polyalphaolefin: Viscosity: 3000 mPa · s (190 ° C), softening point (ring and ball method) 90 ° C
Inorganic filler A: dwarf barium sulfate, average particle size (D50%: μm): 10
Inorganic filler B: zeolite, cation type, BET specific surface area (m ³ / g): 390, average particle diameter (D50%: μm): 4.0
[A hardness of hot melt material, bending workability, fit to face (adhesion)]
Using the materials shown in Table 1 as hot melt materials, the same manufacturing method as in Example 1 was applied to the inner surface of a pleated mask that was melted at 170 ° C. and marketed with a hot melt gun. A mask as shown in FIG.

For each hardness, the hot melt part was folded in the same manner as the bending of the nose fitter part, which is commonly used for the mask coated product, and the workability was evaluated. As with the nose fitter part, ◎ can be processed without problems, ◯ is resistant when folded but easy to process, △ is hard and difficult to bend, and △ is too hard to bend very difficult Things were evaluated as x. In addition, as the fit with the face, particularly good is evaluated as ◎, good is evaluated as ◯, the fit is inferior from the beginning of contact with the face, or it is not sustained even after being in close contact and evaluated as △. did. The results are shown in Table 1.

As the hot melt material, it is desired that the mask nose fitter bends easily and fits to the face. However, when the A hardness is 50 or more, there is resistance at the time of bending, and it can be in close contact with the face once. However, since it is hard to be plastically deformed, it tends to return to its original state by elastic repulsion, and the adhesiveness to the skin is reduced by the restoring force. As the A hardness of the hot melt material, when it is less than 50, both the bending workability and the fit with the face can be satisfied, and when it is 30 or less, the adhesion to the skin is good.
[Ease of removing the mask (skin pain)]
Using the materials shown in Table 2 as hot melt materials, the same manufacturing method as in Example 1 was applied to the inner surface of a pleated mask that was melted at 170 ° C. and marketed with a hot melt gun. A mask as shown in FIG. 6 was manufactured, and the ease of removal of the mask due to the difference in adhesive force (adhesion force) was examined.

The adhesion strength is generally measured as peel strength such as T peel, but when measured as peel strength, the measured value is small and difficult to measure. Therefore, the shear strength was measured as the adhesion strength. In other words, the adhesive strength is 5 mm wide and 150 mm long coated with hot melt material, and after 1 day at room temperature, a polypropylene (PP) sheet (manufactured by Sekisui Material Solutions Co., Ltd., trade name: Polyceme P8134 Natural, (Dimensions 950 × 1000 × thickness 0.2 mm and cut into a 10 mm-wide strip) were pressure-bonded, and the shear shear strength in the length direction was measured to obtain the adhesion strength.

In Examples 11 to 27 of Table 2, when wearing a mask, the evaluation of “fitness with face” in Table 1 is ◎ or ○, and this is indicated as “possible” in Table 2. did. The measurement results of the A hardness of the hot melt material are also shown in Table 2.

Table 2 shows the evaluation results of shear shear strength (adhesion strength) and ease of mask removal (skin pain).

The ease of removal of the mask was evaluated as “Good”, “Good” as “Good”, “△” when the skin was pulled and felt painful, and “X” when the skin was pulled and felt very painful.

The ease of removal of the mask attached to the face is as shown in Table 2, and if it is larger than 450 g / 5 mm, the skin will be pulled during removal and the skin will feel painful. Therefore, the adhesion strength is less than 450 g / 5 mm. preferable. Whether or not the skin feels tension and pain is different depending on whether it is male or female, and the feeling varies depending on the person. Therefore, it is more preferably less than 100 g / 5 mm in that the skin is difficult to feel tension and pain.
[Bleed]
The hot melt material was discharged onto the paper surface and left for 30 days in a room temperature atmosphere, and the surface of the molded product was visually observed to check for bleed out. Here, the bleed out is a phenomenon in which a part of the blend in the hot melt material oozes out on the surface of the molded product and was evaluated according to the following criteria.
○: There is no change in the appearance of the surface of the molded product, and there is no oily bleeding.
Δ: Although there is no change in the appearance of the surface of the molded product, oily oozing is slightly felt.
X: An oil-like thing oozes out on the surface of the molded product and becomes sticky.

The evaluation results for Examples 11 to 16 are shown in Table 2. When the softening agent exceeds 300 parts by mass with respect to 100 parts by mass of the thermoplastic elastomer, the softening agent tends to bleed on the surface of the hot melt material.
[Melting viscosity of hot melt material, ease of sharpening at nozzle tip]
Using the materials shown in Table 1 and Table 2 as hot melt materials, the same manufacturing method as in Example 1 was applied to the inner surface of a pleated mask that was melted at 190 ° C. and marketed with a hot melt gun. Then, a mask as shown in FIG. 6 was manufactured.

Regarding the melt viscosity, the viscosity at a speed of 20 rpm at 190 ° C. was measured with a Brookfield viscometer, and the relationship with the ease of sharpening of the hot melt material at the tip of the discharge nozzle (hardness of stringing) was evaluated. The evaluation was evaluated as ◎, where the sharpness of the hot-melt material at the nozzle tip was particularly good, ◯, where it was good, △, where slight stringing occurred, and x, where stringing occurred significantly. The results are shown in Tables 1 and 2.

Also, using the hot melt material of Example 12, in order to investigate the limit of the melt viscosity at which the hot melt material can be discharged, the discharge temperature was evaluated according to the above criteria by changing the resin temperature. The results are shown in Table 3.

From Table 3, when the melt viscosity exceeds 180,000 mPa · s, the sharpness at the tip of the discharge nozzle is reduced, and stringing tends to occur from the tip of the discharge nozzle. Therefore, the melt viscosity is preferably 180,000 mPa · s or less. It was.

When the melting temperature of the hot melt material 10 and the temperature of the discharge nozzle are increased, the base material of the mask 1 is easily melted. Therefore, the hot melt material 10 is preferably applied at a discharge temperature of 190 ° C. or lower. Therefore, if the melt viscosity at 190 ° C. is 180,000 mPa · s or less, the nozzle breakage can be improved by appropriately adjusting the discharge temperature of the hot melt material 10.

<Example 28>
Using a hot melt material having a melt viscosity at 190 ° C. of 182000 mPa · s, the same manufacturing method as in Example 1 was applied to the inner surface of a pleated mask that was melted at 190 ° C. and marketed with a hot melt gun. A mask as shown in FIG. 6 was manufactured.

After applying the hot melt gun in the normal operation and in the last step of applying with the hot melt gun, turn off the hot melt material discharge switch in the vicinity of the hot melt material application end. The mask nonwoven fabric (near the position where the switch was turned off) in which the tip of the discharge nozzle was brought into contact was compared.

As a result, those that were applied with a hot melt gun by normal operation, after turning off the switch that discharges the hot melt material than the hot melt gun, the sharpness at the tip of the discharge nozzle is bad, so a thin stringing phenomenon is seen, Along with the movement of the hot melt gun, it irregularly attached to the surroundings and damaged the appearance.

On the other hand, in the last step of application with the hot melt gun, the switch for discharging the hot melt material from the hot melt gun was turned off, and then the tip of the discharge nozzle was brought into contact with the mask nonwoven fabric near the application end of the hot melt material. Even if stringing occurs at the tip of the discharge nozzle, the threaded part can be attached by contacting a specific part of the mask nonwoven fabric near the application end of the hot melt material, and at the same time the tip of the discharge nozzle is clean. I was able to.

In each of the embodiments described above, the application pattern of the hot melt material is the application pattern shown in FIG. 6, but the present invention is not limited to this application pattern and does not necessarily cover the entire periphery in the vicinity of the peripheral edge of the mask inner surface. There is no need, for example, when emphasizing only the prevention of fogging of the glasses and the prevention of displacement of the mask, as shown in FIG. 1 and FIGS. Needless to say, it may be applied only.
<Example 29>
The same hot melt material as in Example 12 was used, and the melt was melted at 160 ° C., and a commercially available nitrogen gas mixed melting applicator was used to mix the nitrogen gas into a uniform state. A mask as shown in FIG. 11 was manufactured by applying with a gun. Coating was performed with foaming ratios of 2 times, 3 times, 4 times, and 5 times, respectively, and masks with four different magnifications were manufactured. Table 4 shows the results of the fit with the face when the mask is worn and the restoring property of the hot melt material. The evaluation was good as ◯, and the one slightly lower than that was evaluated as △.

By foaming the hot melt material, the contact portion with the face is more easily deformed along the shape and the fit is improved.However, if the foaming ratio is too high, the unevenness of the hot melt surface becomes significant. Since it has low regenerative properties, it tends to break when discharged from a hot melt gun, and defects such as intermittent application are likely to occur. The preferred magnification is 2 to 4 times from the viewpoint of the property and the appearance.

<Example 30>
A patch test of the hot-melt material used for the mask was performed by the following method, and the safety when the hot-melt material contacted the skin was confirmed.
1. Test method 1) After bathing, wipe off the water well and dry it, and the rounded convex side of the hot-melt material molded into a sealant material (16mmφ circle) inside the upper arm (soft part of the skin) is predetermined on the skin surface Secure with band-aid tape.
2) Leave it until 24 hours have passed and check whether itching or redness has occurred.

The composition of the subjects is as follows.
Subjects: 36 male / female ratio: 15 males and 21 females Age structure of subjects 60 years or older 4 people 55-59 years 3 people 45-49 years 6 people 35-39 years 4 people 25-29 years 4 people 20 to 24 years old 3 people 15 to 19 years old 4 people 10 years old or younger 2 people Materials used 1) Example 5
2) Size: 16 mmφ × 2.7 mm thickness Test results No abnormalities such as itching and redness of the skin were observed in all 36 subjects.

Claims

A mask that is bonded to a non-woven fabric in the vicinity of the periphery of the inner surface of the mask, is provided with a hot melt material that comes into contact with the face when the mask is attached to the face, and the A hardness of the hot melt material is less than 50.
The mask according to claim 1, wherein the hot melt material has an A hardness of 1 or more and less than 50.
3. The mask according to claim 1, wherein the hot melt material is continuously provided at least in the vicinity of the upper edge of the periphery of the inner surface of the mask within a range in contact with both sides of the nose.
The mask according to any one of claims 1 to 3, wherein the hot melt material has a shear shear strength of 450 g / 5 mm or less measured by pressing a polypropylene sheet.
The mask according to claim 4, wherein the hot melt material has a shear shear strength of 10 g / 5 mm or more and 300 g / 5 mm or less measured by pressing a polypropylene sheet.
The mask according to any one of claims 1 to 5, wherein the hot melt material has a melt viscosity of 180,000 mPa · s or less at 190 ° C.
The mask according to any one of claims 1 to 6, wherein the hot melt material is foamed.
The mask according to any one of claims 1 to 7, wherein the hot melt material contains a thermoplastic elastomer.
The mask according to claim 8, wherein the thermoplastic elastomer is a styrene elastomer.
The mask according to claim 8 or 9, wherein the hot melt material further contains a softening agent.
A mask having a melt viscosity at 190 ° C. of 180,000 mPa · s or less, which is adhered to a non-woven fabric in the vicinity of the periphery of the inner surface of the mask and provided with a hot melt material that comes into contact with the face when the mask is attached to the face.
A hot melt material that is bonded to a non-woven fabric in the vicinity of the periphery of the inner surface of the mask and that comes into contact with the face when the mask is attached to the face is provided. The hot melt material contains a thermoplastic elastomer.
The mask according to claim 12, wherein the thermoplastic elastomer is a styrene-based elastomer.
The mask according to claim 12 or 13, wherein the hot melt material further contains a softening agent.
The mask according to any one of claims 1 to 14, wherein when the mask is attached to the face, the thickness of the hot-melt material changes according to the size of the gap formed between the mask and the face.
The mask according to any one of claims 1 to 15, wherein the hot melt material is linearly provided at least near the upper end and near the side edge in the vicinity of the periphery of the mask inner surface.
The mask according to claim 16, which is a pleat-type mask, and the hot melt material provided linearly in the vicinity of the side end is provided so as not to cross the pleat crease.
A method for manufacturing a mask according to any one of claims 1 to 17, wherein a hot melt material is applied to the inner surface of the mask with a hot melt gun.
When applying hot melt material to the inner surface of the mask with a hot melt gun, in the last step of application, after turning off the switch that discharges the hot melt material of the hot melt gun, The method for manufacturing a mask according to claim 18, wherein the mask inner surface is instantaneously brought into contact with the vicinity of the end of application of the melt material.