JP2006218079A - Dust mask - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dust mask having a superior storage property folded into a compact and flat shape, at the same time developed in the both of vertical and horizontal directions when being worn to produce a wide inner space, reducing the breathing resistance, fixing the shape when being worn, and comfortably worn for a long period of time by retaining a distance between the nasal cavity parts and the labia oris part. <P>SOLUTION: A mask base material is processed into a covered binding shape by using a nonwoven fabric sheet folded into a trapezoidal shape as a base material, joining the upper sides and the ends of the both hypotenuses of the trapezoids together and forming the bottom side into an opening. This dust mask can be three-dimensionally developed and folded simultaneously in the vertical and horizontal direction by previously providing embossed lines on the nonwoven fabric sheet to form triangles using the upper side of the trapezoid as the bottom and the perpendicular lines of the triangles on the nonwoven fabric sheet, and vertically folding it inward the mask along the embossed line to provide a center-broken pleated part at the mask central part. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a dust-proof mask that is foldable and has shape retaining properties, and in particular, is provided with a pleat part, and can be expanded three-dimensionally in the vertical and horizontal directions and can be folded into a compact and flat shape. The present invention relates to a dust-proof mask similar to a half-face mask (half mask) covering a side.

  Conventional dust masks are cup-shaped, and once formed, the shape is permanently retained. On the other hand, before and after the mask is attached / detached, it is difficult to store the work clothes and pockets of clothes due to the three-dimensional bulkiness. ing. This is especially true in situations where the mask is frequently attached and detached, and for those who work in such an environment, it is necessary to pay special attention to the location of the mask in terms of contamination and crushing of the inner surface of the mask. Handling is very troublesome.

As an example in which the cup-type mask is foldable, a mask in which the central portion of the portion covering the nose is high and is gradually lowered toward the outer edge so as to be folded in a bellows shape (see, for example, Patent Document 1). Foldable breathing comprising: folding a preformed article along a bisecting axis; cutting the preformed article at a desired angle; and forming a mask by tightly joining the cut article A protective device (see, for example, Patent Document 2) is disclosed. However, they cannot protect the inner surface even when folded, they cannot be folded sufficiently compactly, the face during use, especially the nostril, lip, and mask come into contact during use, and fit with the face However, it is not always satisfactory, or because the internal space of the mask cannot be sufficiently secured, the area involved in the intake and exhaust of the mask is small, and it has the disadvantage that it is difficult to breathe.
JP 2002-282373 A Special Table 2002-537209

  In view of the above-mentioned problems, the object of the present invention is to have an excellent storage property that can be folded in a compact and flat manner. An object of the present invention is to provide a collapsible dustproof mask that can comfortably wear for a long time by fixing the distance between the nostrils and the lips.

  As a result of intensive studies to solve the above problems, the present inventor has joined each side except for the lower side of the trapezoid of the nonwoven fabric sheet folded in a trapezoidal shape and has a bag binding with the lower side of the trapezoid as the opening. By embossing the embossed line to form a specific isosceles triangle at the part corresponding to the protruding part of the mask substrate processed into a shape, it can be folded compactly along the embossed line and easily stored in the pocket When it is deployed, the shape of the mask is fixed, the interior space is fixed widely, and it is found that a foldable dust mask that can be comfortably worn for a long time can be obtained, and the present invention has been completed. It was.

  That is, according to the first invention of the present invention, a bag-like shape having a nonwoven fabric sheet folded in a trapezoidal shape as a base material, the upper side of the trapezoid and the end portions of both oblique sides are joined, and the lower side is an opening. In the mask base material processed into an embossed line, an embossed line is previously formed on the nonwoven fabric sheet so as to form an isosceles triangle based on the upper side of the trapezoid and a perpendicular to the triangle, and the embossed line is vertically formed along the embossed line. A dustproof mask that can be expanded and folded three-dimensionally in the vertical and horizontal directions is provided, in which a fold pleat portion is provided at the center of the mask by folding in the direction.

  According to the second invention of the present invention, in the first invention, the length of the upper side of the trapezoid is L, the length of the lower side of the trapezoid is R ′, the height of the trapezoid is H, and the trapezoid When the height of an isosceles triangle by the embossed line attached to is set to h and the inclination angle of the isosceles triangle is set to Y, L is 4 to 10 cm, R ′ is 3L to 5L, H is 1L to 2L, and h is 0. Provided is a dust mask having 5 L to 1.7 L, H / h of 1.1 to 2, and Y of 45 to 75 degrees.

  According to a third aspect of the present invention, there is provided a dust mask according to the first or second aspect, wherein a nosepiece is provided near the center of the lower side of the trapezoid.

  According to a fourth aspect of the present invention, there is provided a dustproof mask characterized in that in any one of the first to third aspects, an exhaust valve is provided.

  According to a fifth aspect of the present invention, there is provided the dust mask according to any one of the first to fourth aspects, wherein the nonwoven fabric sheet is a laminate of a plurality of nonwoven fabrics.

According to the sixth invention of the present invention, in the fifth invention, the outermost layer of the nonwoven fabric laminate is provided with a photocatalyst and / or a silver-based antibacterial agent, and has a basis weight of 8 to 30 g / m ² . A dust mask is provided which is a spunbonded polypropylene or SM (M) S nonwoven fabric.

According to the seventh invention of the present invention, in the fifth or sixth invention, the nonwoven fabric of the inner layer of the laminate of nonwoven fabrics is a single melt-blown polypropylene nonwoven fabric having a basis weight of 10 to 60 g / m ² subjected to charging treatment. Alternatively, a dust mask characterized by using a plurality of dust masks is provided.

Further, according to the eighth invention of the present invention, in the seventh invention, the inner layer nonwoven fabric of the nonwoven fabric laminate is used in combination with a charged needle punched nonwoven fabric of polyolefin short fibers of 30 to 200 g / m ^2. A featured dust mask is provided.

The dust mask of the present invention can be expanded in both vertical and horizontal directions by providing a folding function with an emboss line, and this feature makes it possible to secure a large internal space when worn and to make wearing for a long time comfortable. There is. In addition, it can be folded vertically and horizontally at the time of storage, and can be folded in a smaller, more compact and flat manner, so that the storage of clothes in a pocket or the like is significantly improved.
By the way, with the conventional folding mask that is folded in two, it is either folded vertically or folded horizontally, and it is impossible to make a large internal space when worn. there were. The size of this inner space reduces the pressure loss during breathing, and also secures the distance from the nostril and lip so as to prevent unpleasant contact with the mask base material. Therefore, in order to enlarge this internal space, it is necessary to enlarge the entire mask, and this has limitations in terms of convenience in use and design related to the face size. In the present invention, the mask is bent by an embossed line and developed into a polyhedral structure, so that it can be easily adapted to the shape of the face, and a mask with significantly improved followability to the face shape than the conventional cup mold is provided. .

The shape of the mask of the present invention, the nonwoven fabric sheet constituting the mask, etc. will be described in detail below.
1. Mask Shape The shape of the mask of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a state in which the mask of the present invention is unfolded, FIG. 2 is a front view of the unfolded state, FIG. 3 is a side view illustrating a folded state, and FIG. FIG. FIG. 5 is a developed view of the mask base material, and FIG. 6 is a view showing a state in which the upper sides of the trapezoidal shape are folded and the oblique sides are joined together.
In the figure, 1 is a mask, 2 and 3 are upper and lower nonwoven fabrics constituting the mask, and each has a trapezoidal shape connected by 4 in a developed state. 4 is an embossing line for folding corresponding to the upper side of the trapezoidal shape, and 5 and 5 ′ correspond to the lower side of the trapezoidal shape. Reference numerals 6 and 6 ′ denote trapezoidal hypotenuses, each of which is a seal joining line between the upper nonwoven fabric 2 and the lower nonwoven fabric 3. 7 and 7 'are tie band attachment parts, 8 is a tie band, and 9 is a nosepiece. 10, 10 'and 11, 11' are embossed lines formed so as to form an isosceles triangle based on the upper side 4 of the trapezoidal shape, and 12, 12 'are perpendicular lines of the isosceles triangle. It is the emboss line given so that it may form.

  The dust mask of the present invention joins the ends 6 and 6 'of the trapezoid hypotenuse of the nonwoven fabric sheet in which the two trapezoids 2 and 3 sharing the trapezoid upper side 4 are integrally formed, and the both ear ends of the trapezoid lower side A dust-proof mask having folded portions 7 and 7 'formed so as to have a tie-band mounting portion on the upper side 4 of the two trapezoidal nonwoven fabric sheets 2 and 3 constituting the mask, and the lower side 5 of the trapezoid. , 5 ′, embossed lines are formed so as to form isosceles triangles 4, 10, 10 ′ and 4, 11, 11 ′ and perpendicular lines 12, 12 ′ of the triangles.

These embossed lines are applied by embossing that melt-bonds the non-woven sheets constituting the mask, preferably a plurality of non-woven sheets, and also serves to partially bond the non-woven fabric layers together with the above-mentioned trapezoid hypotenuse seal joint line. Yes. The cross-section when embossed lines are applied to a mask base material composed of a plurality of nonwoven fabric sheets has a plurality of nonwoven fabric layers fused or semi-fused as shown in FIG. As an integral hinge, it has the effect of being able to repeat circular bending and rotation. In FIG. 7, 20 is a non-woven fabric fusion or semi-melt portion by an emboss line, and 21 to 23 are non-woven fabric sheets.
The form of the embossed line is not particularly limited, and may be, for example, a solid line, a broken line, a one-dot chain line, or a two-dot chain line, and can be appropriately selected depending on the material and the number of nonwoven fabrics used for the mask substrate. A solid line is used for 6 'joining from the viewpoint of sealing properties, and a broken line, a one-dot chain line, and a two-dot chain line are preferably used for the other embossed lines.

The mask 1 composed of a nonwoven fabric sheet in which three sides excluding the lower side of the trapezoidal shape of the upper nonwoven fabric 2 and the lower nonwoven fabric 3 are joined to form a convex portion having the upper side 4 of the trapezoidal shape as a tip when worn. The convex portions are provided with triangular embossed lines as described above, and before and after use, upper isosceles triangles composed of embossed lines 10, 10 ', 4 and 11, 11', 4 The constructed lower isosceles triangle is folded inside the mask along the vertical lines 12, 12 '. Accordingly, when the folded mask is unfolded for mounting, the emboss lines 10, 10 ′, 11 and 11 ′ forming the diagonal lines form the bent lines on the mask surface, and are moderate in the mask. By forming a cup-shaped polyhedral mask that forms a space and securing an appropriate internal space, the nostril portion and lip portion of the face are not pressed against the inner surface of the mask, and correspond to a trapezoidal lower side portion. The outer periphery of the mask fits to the face to give excellent sealing properties and avoids the inflow of dirty air from the side.
In order to further improve the above-described fit and air sealing performance, it is preferable to install a flexible sealing material slit to an appropriate size inside the mask along 5, 5 ′.

That is, the embossed lines 10, 10 ', 11, and 11' form an oblique line with respect to the vertical direction of the mask, so that the upper half of the embossed line is embossed along with the embossed lines 12 and 12 'applied vertically. It is divided into four sub-sections A to D, and the lower half is formed by a polyhedron consisting of four sub-sections E to H. Therefore, an appropriate space is formed inside the mask and fits well to the shape of the face. It has the feature to do.
Furthermore, each embossed line becomes a ridgeline on each surface, which functions as a reinforcing rib for the entire mask and fulfills the function of improving the shape retention.

Furthermore, when the mask of the present invention is stored in the pocket, the emboss lines 12 and 12 'form vertical lines, and the mask is folded along the emboss lines 12, 12' so that the mask is formed as shown in FIG. Thus, it can be folded vertically into a flat shape. This folding method not only has the advantage that the mask spreads in the horizontal direction when the tie band described later is stretched in the horizontal direction when the mask is mounted, but also develops the folded portion. Thus, a wide mounting space can be provided.
It should be noted that the emboss lines 12 and 12 'can be provided with a plurality of orthogonal emboss lines as appropriate and can be stabilized in shape when used.

In the mask of the present invention, when the non-woven fabric to be formed is developed, a trapezoidal shape sharing the upper side as shown in FIG. 5 is formed. Further, by joining the trapezoidal oblique sides, a mask base material having side surfaces as shown in FIG. 6 is obtained.
In this shape, the length of the upper side of the trapezoid is L, the length of the lower side of the trapezoid is R ′, the height of the trapezoid is H, the height of the isosceles triangle by the embossed line attached to the trapezoid is h, When the inclination angle of the isosceles triangle is Y, L is 4 to 10 cm, R ′ is 3L to 5L, H is 1L to 2L, h is 0.5L to 1.7L, and H / h is 1.1 to 2. , Y is 45 to 75 degrees.
When L ′ is outside the range of 3L to 5L and H is 1L to 2L with L as a unit reference, the entire outer shape of the mask spreads sideways, the mask tip becomes sharp, or the protrusion becomes unnecessarily large. It is unsuitable for use as a dust mask because of poor usability and appearance. Further, if h is out of the range of 0.5L to 1.7L and Y is out of the range of 45 to 75 degrees, the area of the half-folded pleat part becomes narrow or it becomes difficult to form the middle-folded part, This causes a problem in folding and is not preferable.

  The method for producing the mask of the present invention is obtained by punching the nonwoven fabric having the shape shown in FIG. 5, and then forming a joint seam line on the trapezoidal lower side and an embossed line such as the above defined triangular shape by a known method, Apply using ultrasonic welding. Subsequently, the trapezoid oblique sides are joined using a known method, for example, a heat fusion method, a method using an adhesive, an ultrasonic welding method, or the like to form a mask original. Here, the two trapezoids 2 and 3 in FIG. 5 can be joined as independent constituent substrates to assemble a mask, and in this case, the trapezoid upper side 4 also becomes a joint seam line. However, the two trapezoids 2 and 3 are preferably formed in an integrated shape sharing the upper side 4 as shown in FIG.

  In the mask of the present invention, tie bands are attached to both ends of the lower side of the trapezoid. After joining the two trapezoidal nonwoven fabric sheets at the trapezoid hypotenuse as shown in FIG. 8, the end of the trapezoid lower side is folded as shown by the arrow in FIG. 8 (1) and passed through the tie band 8. The tip of the end is heat-sealed or ultrasonically welded to the hypotenuse joint at point 71. At that time, if the length corresponding to the lower side of the trapezoid after folding both ends is R (see FIG. 6), R is preferably 2L to 4L. By setting R within this range, it is possible to secure an appropriate internal space that takes into account the size of the cheek of the face inside the mask.

Moreover, in the mask of this invention, the nosepiece 9 can be provided along the center part of 5 equivalent to the trapezoid lower side part of an upper nonwoven fabric.
As shown in FIG. 4, the nosepiece serves as an auxiliary function for keeping the mask shape at the same time as bringing the mask into close contact with the shape of the nose when worn. Therefore, if it has such a function, the material and size are not particularly limited. For example, a wire coated with aluminum or plastic, a shape memory plastic, or the like can be given. The nosepiece can be fixed to the mask with an adhesive such as a pressure sensitive adhesive, a liquid hot melt adhesive, or ultrasonic welding. Moreover, a nosepiece can also be incorporated in the inside of the nonwoven fabric which comprises a mask.

  Furthermore, in the dust mask of this invention, an exhaust valve can be provided as needed. The exhaust valve can be used without particular limitation as long as it has a function of providing easy exhalation discharge to the mask wearer, and examples thereof include a diaphragm valve. The place where the exhaust valve is mounted is not particularly limited, and it is preferably provided at any part of A, E, D, and H shown in FIG. 2 by sonic welding, adhesion, mechanical clamping, or the like. FIG. 9 shows an example of the mask of the present invention provided with an exhaust valve. FIG. 9 shows an example in which the exhaust valve 13 is added to a portion E shown in FIG.

  Furthermore, in the dust mask of the present invention, if necessary, a seal material can be provided inside the portion in contact with the face, in particular, inside 5 or 5 'corresponding to the lower side of the trapezoid. As the sealing material, a sheet capable of absorbing facial sweat and the like and having a flexible and excellent touch is preferable. For example, a cotton sheet, a urethane foam sheet, or the like can be used.

2. Nonwoven Fabric Sheet The nonwoven fabric sheet used in the mask of the present invention may be a single layer, but is preferably a laminated nonwoven fabric sheet in which nonwoven fabrics having a plurality of different functions / performances are laminated.
As a laminated nonwoven fabric sheet, the laminated nonwoven fabric sheet which consists of at least 3 layer which comprises an outermost layer, an inner layer, and an innermost layer is still more preferable.
The resin material used for the nonwoven fabric used in the mask is not particularly limited, and examples thereof include polyolefins such as polyethylene and polypropylene, and polyesters such as polyethylene terephthalate and polybutylene terephthalate. Moreover, you may use the composite fiber of the said resin. For example, a composite fiber in which the sheath portion of the outer layer is made of polyethylene and the core portion of the inner layer is made of polypropylene can be mentioned. In this composite fiber, for example, as the polyethylene of the sheath portion, any of high density polyethylene, medium density polyethylene, low density polyethylene, ethylene-vinyl acetate copolymer, and the like can be used. In addition, it is preferable to use such a composite fiber for the below-mentioned thermal bond nonwoven fabric.

  As a nonwoven fabric which comprises the outermost layer in the said laminated nonwoven fabric sheet, it has a function which is located in the outermost layer of a mask and protects an inner layer. Moreover, the nonwoven fabric which provided the photocatalyst and / or the silver type antibacterial agent, and had the antibacterial effect as needed can be used. A photocatalyst cuts the bacteria and the splash which contains a virus adhering to an outermost layer, and disinfects with the effect of a photocatalyst and / or the effect of a silver antibacterial agent.

The photocatalyst undergoes a photocatalytic reaction when exposed to ultraviolet light, and a strong oxidizing power appears, thereby killing and decomposing the virus adhering to the outermost layer. Therefore, in order to maximize the photocatalytic effect, the outermost layer of the mask is used. It is preferable to attach to. When attached to the nonwoven fabric on the inner layer side, the ultraviolet rays may not reach sufficiently, and the photocatalytic effect may not be maximized.
The photocatalyst used in the present invention is not particularly limited, but titanium apatite obtained by synthesizing titanium and hydroxyapatite is preferable because it has an adsorption function.

  The method for attaching the photocatalyst to the nonwoven fabric is not particularly limited as long as it does not easily fall off. In the case of the addition with a binder, as a preferred example, an aqueous dispersion obtained by emulsifying an acrylic resin or a styrene-butadiene rubber (SBR resin) is used for the photocatalyst addition. Alternatively, a silane compound may be used for the binder. After the photocatalyst is dispersed in water containing the binder, the photocatalyst is firmly fixed on the nonwoven fabric by impregnating the nonwoven fabric and drying at high temperature. Alternatively, a photocatalyst can be kneaded into a nonwoven fabric resin without using a binder, and a nonwoven fabric can be obtained through melt spinning.

In the mask of the present invention, the amount of the photocatalyst attached to the outermost layer nonwoven fabric is preferably 0.5 to 10 g / m ² , more preferably 1 to 6 g / m ² . When the photocatalyst adhesion amount is less than 0.5 g / m ² , the ability of the photocatalyst is poor and the bacteriostatic property of the pathogen is reduced. On the other hand, when the photocatalyst amount exceeds 10 g / m ² , the effect of increasing the amount does not appear so much. Clogging increases pressure loss, which is undesirable for mask performance.

On the other hand, the silver antibacterial agent used in the present invention is not particularly limited, but those commercially available are those in which silver ions are supported on zeolite or those in which silver ions are supported on a zirconium phosphate inorganic ion exchanger. Etc. are used. As the silver-based antibacterial agent, similarly to the above-described photocatalyst, a method of attaching using a binder and a spunbond nonwoven fabric kneaded into a nonwoven fabric raw material resin (polypropylene) can also be used. For the binder impregnated, impregnation amount to the outermost layer non-woven fabric, similar to the photocatalyst, 0.5 to 10 g / ^{m 2,} more preferably from 1 to 6 g / ^{m 2.} Moreover, when knead | mixing to raw material resin, it is 0.5 to 5 weight%. In the case of kneading, the antibacterial effect is less likely to be manifested at 0.5% by weight or less, and it is not preferable at 5% by weight or more because no significant quantitative effect is observed and the spinnability in spunbond molding is impaired.

  Moreover, in this invention, the antibacterial property can be utilized in a wide use condition by using a photocatalyst and a silver type antibacterial agent together. That is, the photocatalyst exhibits a strong bactericidal effect when irradiated with light, but the effect is not exhibited when the mask is placed in a dark place. The silver antibacterial agent used in combination also exhibits antibacterial properties even in the dark. Further, since silver-based antibacterial agents alone have poor adsorptive properties, practical antibacterial action can be effectively exhibited by using them in common with an adsorbing titanium apatite photocatalyst. That is, in the present invention, by using titanium apatite as a photocatalyst in combination with a silver antibacterial agent, both functions can be complemented and the antibacterial properties of the mask can be enhanced by mutual effects.

When a photocatalyst and a silver-based antibacterial agent are used in combination, it is possible to mix them in the same binder at the same time and attach them to the nonwoven fabric. Preferably, however, once the silver-based antibacterial agent is kneaded into the fiber material, the antibacterial span It is also possible to use a non-woven fabric in which a non-woven fabric is bonded and a photocatalyst is attached to the non-woven fabric with a binder. In this case, it is preferable to use a titanium apatite type as the photocatalyst from the viewpoint of adsorbing performance of bacteria, viruses and the like. Further, a photocatalyst and a silver-based antibacterial agent can be kneaded into fibers simultaneously to form a spunbond nonwoven fabric, which can be used as the outermost layer nonwoven fabric.
In any case, it is important in the present invention to use a non-woven fabric provided with the above-mentioned photocatalyst and / or silver antibacterial agent as the outermost layer of the mask.

Examples of the nonwoven fabric used for the outermost layer of the mask include a spunbond nonwoven fabric, a spunbond / meltblown composite nonwoven fabric (SMS nonwoven fabric), a spunbond nonwoven fabric, and a thermal bond nonwoven fabric. The preferred weight of the non-woven fabric varies depending on the non-woven fabric used.
In the case of an SMS nonwoven fabric, 8-30 g / m < ² > is preferable, More preferably, it is 15-20 g / m < ² >. For spunbonded nonwoven fabric, preferably 9~100g / ^{m 2,} more preferably from 20 to 70 g / ^{m 2.} In the case of a thermal bond nonwoven fabric, 20-200 g / m < ² > is preferable, More preferably, it is 50-150 g / m < ² >.
In each non-woven fabric, if the weight per unit area is less than the lower limit, stable production is difficult in terms of unevenness of fiber dispersion and winding strength, and if it exceeds the upper limit, ventilation resistance increases, and preferable performance as a mask. Out of range.

In the spunbond nonwoven fabric part preferably used in the outermost layer, the average fiber diameter is preferably 10 to 30 μm. The total weight per unit area of the spunbond layers is preferably 8 to 30 g / m ² . Those having an average fiber diameter of less than 10 μm are difficult to produce due to the characteristics of the production method, and are not realistic. On the other hand, if the thickness exceeds 30 μm, the number of constituent fibers is reduced, resulting in uneven dispersion of the fibers. When the total weight per unit area is less than 8 g / m ² , the strength is lowered, and the tensile strength withstanding the processing is insufficient in pasting with the supporting base nonwoven fabric in the subsequent step. On the other hand, even if it exceeds 30 g / m ² , the collection efficiency does not improve so much, the pressure loss increases unnecessarily, and becomes impractical.
An SMS nonwoven fabric is also used as a preferred nonwoven fabric for the outermost layer. This SMS nonwoven fabric is used in an amount of 8 to 30 g / m ² , more preferably 15 to 20 g / m ² .

The non-woven fabric constituting the inner layer can be selected to meet various mask standards in terms of the balance of pressure loss and particulate collection efficiency as a whole mask, and in particular, has a low-pressure loss and high collection efficiency mask performance. The applied melt blown polypropylene nonwoven fabric is suitable, and preferably, this nonwoven fabric is used in a single layer or a plurality of layers.
The melt blown nonwoven fabric preferably used in the inner layer has an average fiber diameter of preferably 2 to 8 μm, a basis weight of preferably 10 to 60 g / m ² , and a bulk density obtained by dividing the basis weight by thickness. .20 g / m ³ . If the average fiber diameter is less than 2 μm, the air permeability decreases (pressure loss increases), and the clogging of the fine particles is fast, whereas if it exceeds 8 μm, the collection efficiency of the fine particles decreases.
The nonwoven fabric constituting the inner layer may be a laminate comprising two or more types of nonwoven fabrics having different weights per unit area, or a laminate comprising a combination of nonwoven fabrics having the same basis weight, and having different bulk densities. You may combine. For example, the total basis weight weight Taking the case of a 60 g / ^{m 2} as an example, a combination two of 30 g / ^m 1 sheet ² of nonwoven fabric and 15 g / ^{m 2} nonwoven fabric was a two nonwoven 30 g / ^{m 2} Or a combination of three nonwoven fabrics of 20 g / m ² can be used in any combination such that the whole is 60 g / m ² .

  Further, the melt blown nonwoven fabric used for the inner layer is preferably subjected to charging treatment in order to improve the function of collecting fine particles. This is because by performing the charging process, fine dust can be efficiently collected by electrostatic force. The charging process is performed by a corona discharge process or the like.

Furthermore, as a nonwoven fabric used for the inner layer, a needle punch nonwoven fabric mainly composed of a charged polyolefin short fiber can be used in combination with the above melt blown nonwoven fabric. Melt blown nonwoven fabric can capture fine particles with high efficiency, but it has the disadvantage of large pressure loss. If the number of meltblown nonwoven fabrics and weight per unit weight are limited, the needle blown nonwoven fabric is charged. It is effective to use together. The weight per unit area of the needle punched nonwoven fabric, 30 to 200 g / ^{m 2} is preferred.

  The non-woven fabric constituting the innermost layer is a non-woven fabric used for enhancing the rigidity of the mask, that is, a non-woven fabric having a function of a support for shaping, and is used for imparting shape retention of the entire mask. is there. Therefore, as the nonwoven fabric constituting the innermost layer, a thermal bond nonwoven fabric is preferable, and a rayon nonwoven fabric or a cellulose nonwoven fabric may be used. The weight per unit area is not particularly limited as long as the air permeability is not impaired.

3. Mask The dust mask of the present invention has excellent storage properties that can be folded compactly and flatly as described above, determines the shape when the mask is mounted, secures the space volume in the mask, and makes wearing for a long time comfortable. It has the characteristics that can be. Furthermore, if necessary, the mask outer surface layer may be a non-woven fabric having a photocatalyst and / or silver antibacterial agent treatment, and the inner layer may be a mask using a plurality of charged melt blown nonwoven fabrics or charged needle punch nonwoven fabrics. it can. By using a mask made of such a material, it can be made into a mask that has both antibacterial properties and high dust-proof capability, and it also protects against dust from bacteria and viruses such as Mycobacterium tuberculosis in addition to dust-proofing in industrial work environments. However, the mask can be improved significantly. Therefore, it can be used not only for industrial use but also for a wide range of uses such as infection prevention and dental treatment in hospitals and prevention of epidemics.
In particular, the mask of the present invention is a half mask covering a part of the face, and its total effective surface area is 150 to 300 cm ² , and DS1, DS2, DS3 and DL1, DL2, DL3 in the standard of dust masks in Japan. Even a satisfactory mask can be handled by appropriately changing the configuration of the nonwoven fabric layer used for the inner layer.
Further, it can also be used as a mask that satisfies various mask standards established by the NIOSH (National Institute for Occupational Safety and Health), especially the N95 standard, or European standards PP1, PP2, and PP3.

  EXAMPLES The present invention will be described below with reference to examples, but the present invention is not limited to only the examples. In addition, the test method used by the Example and the comparative example and the nonwoven fabric material used are as follows.

1. Test method (1) Weight per unit area of non-woven fabric: A test piece of 100 × 100 mm was taken from the sample length direction, the weight in a moisture equilibrium state was measured, and calculated per 1 m ² .
(2) Photocatalytic ability: A part of the mask was cut out and sampled, and the effect was determined by the following liquid phase film adhesion method established by the Photocatalyst Product Technical Council.
Test liquid: 10ppm methylene blue 0.1ml
Covering film: 50 μm, 30 mm square LDPE film Ultraviolet intensity: 1 mW / cm ² (using two 20 W black lights)
Operation: 0.1 ml of the test solution is dropped on the surface of the sample, and the test solution is spread evenly by covering with a coating film. Irradiate ultraviolet rays, and visually confirm the decolored state of the test solution after the elapsed time.
Effect determination: If decolorization is observed within 2 hours of ultraviolet irradiation, it is determined that the photocatalytic ability is present.
(3) Pressure loss, transmittance: A mask is attached to a TSI 8130 type filter tester, and air containing NaCl particles having a median NaCl particle size distribution (Count Medium Diameter) of 0.075 μm is 85 liters / minute. The sample was allowed to flow under the conditions, and the collection efficiency of NaCl particles was measured. The pressure loss was measured under the conditions of 40 liters / minute and 85 liters / minute.

2. Material (1) Photocatalyst: Calcium titanium hydroxyphosphate synthesized from titanium and hydroxyapatite ((Ca, Ti) ₁₀ (OH) ₂ (PO ₄ ) ₆ (PHOTOHAP PCAP-100 manufactured by Taihei Chemical Industry) was used. A water-dispersed acrylic resin equivalent to a colleague was used as a solid content in order to fix the non-woven fabric.
(2) Silver-based antibacterial agent: A silver-based antibacterial agent (manufactured by Sinanen Zeomic Co., Ltd.) in which silver ions and the like were incorporated into the structure of a zeolite having a three-dimensional framework structure by aluminosilicate was used.
(3) The following nonwoven fabric-1 to nonwoven fabric-7 were used as the nonwoven fabric sheet.
(I) Non-woven fabric-1: Polypropylene spunbonded non-woven fabric having a weight per unit area of 20 g / cm ² (ii) Non-woven fabric-2: Charge-treated polypropylene SMS non-woven fabric having a per unit weight of 20 g / cm ² (iii) Non-woven fabric-3: Per unit weight 25 g / cm ² charging the treated polypropylene meltblown nonwoven fabric (iv) non-woven -4: basis weight of 30 g / cm ² charging the treated polypropylene meltblown nonwoven fabric (v) non-woven -5: charging of basis weight of 50 g / cm ² Polyolefin short fiber needle punch nonwoven fabric.
(Vi) Non-woven fabric-6: Polyolefin short fiber thermal bond non-woven fabric having a weight per unit area of 130 g / cm ² (vii) Non-woven fabric -7: 1% by weight of the above-mentioned (2) polypropylene spunbond non-woven fabric having a per unit weight of 20 g / m ² Nonwoven fabric with kinaenzeomic silver antibacterial agent shown

Example 1
A non-woven fabric-1 with 4 g / m ^{2 of} photocatalyst attached as the surface layer, non-woven fabric-3 as the inner layer, and non-woven fabric-6 as the innermost lip layer is punched into a shape as shown in FIG. Then, an emboss line was applied with ultrasonic waves. With respect to the dimensional specifications at this time, L was 9 cm, R was 20 cm, R ′ was 24 cm, H was 9 cm, h was 7.5 cm, H / h was 1.2, and Y was 67 degrees.
Next, a plastic nosepiece (length 100 mm × width 6 mm × thickness 1 mm: manufactured by Sekisui Chemical Co., Ltd.) was attached and joined at a position as shown in FIG.
Further, tie bands were attached to the ears at both ends as shown in FIG. 8 to obtain a dust mask. At this time, the size (one side) of the folded state (FIG. 3) was about 100 cm ² . The evaluation results of the obtained mask are shown in Table 1.

(Example 2)
A dust mask was obtained in the same manner as in Example 1 except that Non-woven fabric-4 and Non-woven fabric-5 were used as the inner layer. The evaluation results of the obtained mask are shown in Table 1.

(Example 3)
Use non-woven fabric-7 kneaded with silver antibacterial agent as the outermost layer non-woven fabric, 2 g / m ^{2 of} photocatalyst added on top, non-woven fabric-4 and non-woven fabric-3 as inner layers, and attach exhaust valve Except for the above, a dust mask was obtained in the same manner as in Example 1. Table 1 shows the evaluation results of the obtained mask.

(Comparative Example 1)
A dust mask was obtained in the same manner as in Example 3 except that no emboss line was applied and no photocatalyst or silver antibacterial agent was added. At this time, when no center folding the distal portion of the mask, that is, the size in the upper body as shown in FIG. 6 was approximately 140cm ^2. The evaluation results of the obtained mask are shown in Table 1.

  As is clear from Table 1, Examples 1 to 3 have a sufficient photocatalytic function, exhibiting low pressure loss and low dust permeability. Further, in Example 3, the photocatalytic effect comparable to that of the low photocatalyst addition amount is shown. Moreover, about the mask of Examples 1-3, the area (one side) after folding becomes 75% with respect to a comparative example, and since it folded more compactly, the storing property in a pocket is improving.

The dust-proof mask of the present invention has an excellent storage property that can be folded compactly and flatly, can fix the shape when the mask is mounted, fix the mask internal volume, and can be folded for a long period of comfort. Since it is a dust mask, it can be used not only for industrial purposes but also in a wide range of applications such as prevention of infection and dental treatment in hospitals, and prevention of epidemics.
In particular, the mask of the present invention is a half mask covering a part of the face, and its total effective surface area is 150 to 300 cm ² , and DS1, DS2, DS3 as well as DL1, DL2, DL3 in the Japanese dust mask standard. Even a satisfactory mask can be handled by appropriately changing the configuration of the nonwoven fabric layer used for the inner layer.
Further, it can also be used as a mask that satisfies various mask standards established by the NIOSH (National Institute for Occupational Safety and Health), especially the N95 standard, or European standards PP1, PP2, and PP3.

It is a perspective view of the state where the mask of the present invention developed. It is a front view of the state which the mask of the present invention developed. It is a side view of the folded state of the mask of this invention. It is a figure of the state equipped with the mask of the present invention. It is an expanded view of the mask base material of this invention. It is a figure explaining the shape of the mask of this invention. It is sectional drawing of the nonwoven fabric sheet explaining an emboss line. It is a figure explaining the process of attaching a tie band. It is a side view of the folded state which attached the exhaust valve of the mask of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Dust mask 2 Upper nonwoven fabric 3 Lower nonwoven fabric 4 Trapezoid upper side 5, 5 'Trapezoid lower side 6, 6' Trapezoid hypotenuse 7 Tie band attachment part 8 Tie band 9 Nosepiece 10, 10 ', 11, 11', 12, 12 'Emboss Line 13 Exhaust valve

Claims (8)

  In the mask base material processed into a bag binding shape with the upper side of the trapezoid and the end portions of both oblique sides joined together and the lower side as the opening, using the nonwoven fabric sheet folded in a trapezoidal shape as a base, Is provided with an embossed line so as to form an isosceles triangle based on the upper side of the trapezoid and a perpendicular to the triangle, and is folded in the longitudinal direction inside the mask along the embossed line so as to be folded in the middle of the mask. A dust mask that can be expanded and folded in three dimensions in the vertical and horizontal directions at the same time.   The length of the upper side of the trapezoid is L, the length of the lower side of the trapezoid is R ′, the height of the trapezoid is H, the height of the isosceles triangle by the embossed line attached to the trapezoid is h, and the height of the isosceles triangle When the inclination angle is Y, L is 4 to 10 cm, R ′ is 3 L to 5 L, H is 1 L to 2 L, h is 0.5 L to 1.7 L, H / h is 1.1 to 2, Y is 45. The dust mask according to claim 1, wherein the dust mask is -75 degrees.   The dust mask according to claim 1 or 2, wherein a nosepiece is provided near the center of the lower side of the trapezoid.   The dust mask according to any one of claims 1 to 3, wherein an exhaust valve is provided.   The dust mask according to any one of claims 1 to 4, wherein the nonwoven fabric sheet is a laminate of a plurality of nonwoven fabrics. The outermost layer of the laminate of nonwoven fabrics is a polypropylene spunbond or SM (M) S nonwoven fabric with a basis weight of 8 to 30 g / m ² to which a photocatalyst and / or a silver antibacterial agent is applied. Item 6. A dust mask according to Item 5. 7. The dust mask according to claim 5, wherein the nonwoven fabric of the inner layer of the laminate of nonwoven fabrics uses one or more melt blown polypropylene nonwoven fabrics having a weight per unit weight of 10 to 60 g / m ² subjected to electrification treatment. The dust mask according to claim 7, wherein the nonwoven fabric of the inner layer of the nonwoven fabric laminate is used in combination with a charged needle punched nonwoven fabric of polyolefin short fibers of 30 to 200 g / m ² .

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