JP7284608B2 - Mask and its manufacturing method - Google Patents

Description

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

Masks are used when sick, when dust such as pollen or yellow sand comes flying, and in other daily life, for the purpose of preventing infection and blocking dust, and are required to have a high filter effect.
Therefore, in order to obtain a high filter effect, a mask using a non-woven sheet whose main fiber is cellulose nanofiber has been proposed (see, for example, Patent Document 1).

JP 2009-185417 A

However, in the mask described in Patent Document 1, cellulose nanofibers are dispersed in the nonwoven sheet used for the mask, so the moisture retention of the mask cannot be improved, and water droplets due to exhalation cannot be improved. There is a problem that the generation cannot be suppressed.

SUMMARY OF THE INVENTION An object of the present invention is to provide a mask capable of improving the moisturizing property of the mask and suppressing the formation of water droplets due to exhalation, and a method of manufacturing the same.

In order to solve the above problems, the invention according to claim 1,
A mask comprising a mask main body made of a sheet material and covering a target portion of a wearer's face, and a pair of left and right ear hooks for engaging the mask main body with the wearer's ears ,
The mask main body includes at least a wearer-side sheet material closest to the wearer's skin, an outer surface-side sheet material farthest from the wearer's skin, the wearer-side sheet material, and the outer surface. A filter provided between the side sheet material and a filter are laminated,
The wearer-side sheet material is coated with cellulose nanofibers,
2 to 8% by weight of the cellulose nanofiber is applied to the wearer-side sheet material .
ADVANTAGE OF THE INVENTION According to this invention, the moisturizing property of a mask can be improved and the generation of water droplets due to exhalation can be suppressed.
Moreover, according to the present invention, the moisturizing property of the mask can be further improved.

The invention according to claim 2 is the mask according to claim 1 ,
The filter is characterized by being coated with cellulose nanofibers.
ADVANTAGE OF THE INVENTION According to this invention, the moisturizing property of a mask can be improved more.

The invention according to claim 3 is the mask manufacturing method according to claim 1 or 2 ,
The wearer-side sheet material is coated with a cellulose nanofiber dispersion.
According to the present invention, it is possible to save the trouble of kneading cellulose nanofibers into the fibers forming the wearer-side sheet material or forming a film.

ADVANTAGE OF THE INVENTION According to this invention, the moisturizing property of a mask can be improved and the generation of water droplets due to exhalation can be suppressed.

1 is a perspective view showing a mask according to an embodiment; FIG. It is a front view which shows the mask which concerns on embodiment. 3 is a cross-sectional view taken along line III-III of FIG. 2; FIG. It is a graph which shows the result of the moisturizing amount measurement test.

A specific aspect of the mask 100, which is an embodiment of the present invention, will be described below with reference to FIGS. 1 to 3. FIG. However, the technical scope of the present invention is not limited to the illustrated examples, and is determined based on the description of the claims.
In the following description, as shown in FIG. 1, front and rear, left and right, and up and down are defined based on the direction viewed from the wearer of the mask.

[Description of configuration]
≪Overall composition≫
As shown in FIGS. 1 and 2, the mask 100 includes a mask main body 1 that covers the wearer's face such as the nose, mouth, chin, etc., and a right ear for hanging the mask main body 1 on the wearer's right ear. It has an ear hooking part 2 and a left ear hooking part 3 for hooking the mask main body part 1 on the wearer's left ear. The mask 100 is worn with the rear side of the mask main body 1 facing the wearer's face.

<Mask body>
As shown in FIGS. 2 and 3, the mask main body 1 is formed of a plurality of sheet materials and has a generally rectangular shape when viewed from the front.
The mask main body 1 is preferably 120 mm to 210 mm, more preferably 145 mm to 175 mm in the horizontal direction, and preferably 70 mm to 100 mm, more preferably 80 mm to 90 mm in the vertical direction.

As shown in FIG. 3, the mask main body 1 has an outer non-woven fabric 11 and a filter 12 positioned on the frontmost surface of the mask main body 1 (the surface farthest from the wearer's skin) in order from the surface farthest from the wearer's skin. , and the wearer-side nonwoven fabric 13 located on the rearmost surface of the mask main body 1 (the surface closest to the wearer's skin).

As a specific sheet material, for example, polypropylene spunbond, polyethylene spunbond, nylon spunbond, etc. are used as the outer surface side nonwoven fabric 11 and the wearer side nonwoven fabric 13, and polypropylene meltblown, rayon spunbond, etc. are used as the filter 12. be done. In addition, the wearer-side nonwoven fabric 11 may be coated with a moisturizing agent, a softening agent, an antibacterial agent, or the like.
Most preferably, polypropylene spunbond is used as the outer surface side nonwoven fabric 11, nylon spunbond coated with a moisturizing agent is used as the wearer side nonwoven fabric 13, and polypropylene melt blown is used as the filter 12 sandwiched between them.

Cellulose nanofibers (hereinafter sometimes referred to as CNF) are applied to the wearer-side nonwoven fabric 13 in order to enhance the moisturizing function. The coating amount of cellulose nanofibers is preferably 2 to 8% by weight. In particular, it is more preferably about 4% by weight. This is because if the coating amount of the cellulose nanofibers is too small, the moisturizing function cannot be sufficiently exhibited, and if the coating amount is too large, the nonwoven fabric becomes hard. The cellulose nanofibers need not be applied to the outer nonwoven fabric 11; for example, the cellulose nanofibers may be applied to the filter 12. FIG.

(CNF)
CNF refers to fine cellulose fibers obtained by defibrating pulp fibers, and generally refers to cellulose fibers containing cellulose fine fibers having an average fiber width of nanosize (1 nm or more and 1000 nm or less).

Pulp fibers that can be used to produce CNF include chemical pulps such as hardwood pulp (LBKP), softwood pulp (NBKP), bleached thermomechanical pulp (BTMP), stone ground pulp (SGP), pressure stone ground pulp (PGW ), refiner ground pulp (RGP), chemi ground pulp (CGP), thermo ground pulp (TGP), ground pulp (GP), thermomechanical pulp (TMP), chemithermomechanical pulp (CTMP), refiner mechanical pulp (RMP) Used paper manufactured from mechanical pulp, used tea paper, used kraft envelope paper, used magazine paper, used newspaper paper, used leaflet paper, used office paper, used corrugated paper, used white paper, used Kent paper, used imitation paper, used paper for certificates, used waste paper, etc. Pulp, deinked pulp (DIP) obtained by deinking waste paper pulp, and the like. These may be used singly or in combination of two or more as long as the effects of the present invention are not impaired.

Examples of methods for producing CNF include mechanical methods such as high-pressure homogenizer method, microfluidizer method, grinder grinding method, bead mill freeze pulverization method, and ultrasonic defibration method, but are limited to these methods. isn't it.
For example, pulp fibers subjected to a defibration treatment by a mechanical method may be subjected to a chemical treatment such as carboxymethylation, or may be subjected to an enzyme treatment. Examples of chemically treated CNF include iCNF (individualized CNF) (single nanocellulose) with a diameter of 3 to 4 nm, such as TEMPO-oxidized CNF, phosphate-esterified CNF, and phosphite-esterified CNF. be done.
In addition, CNF that has been chemically or enzymatically treated may be defibrated by a mechanical method.

The CNF used in the present embodiment preferably has an average fiber width of 1 nm to 100 nm as calculated by the method described below.

Examples of CNF that can be specifically used include 100% NBKP CNF having an average fiber width (median diameter) of 49 nm. This CNF was obtained by subjecting NBKP to refiner treatment and coarse fibrillation, followed by four treatments and fibrillation using a high-pressure homogenizer.

Here, a method for measuring the fiber width (average fiber width) of CNF will be described.
First, 100 ml of an aqueous dispersion of cellulose nanofibers with a solid content concentration of 0.01 to 0.1% by mass was filtered through a Teflon (registered trademark) membrane filter, and the solvent was filtered once with 100 ml of ethanol and 3 times with 20 ml of t-butanol. Replace.
It is then freeze-dried and coated with osmium to form a sample. For this sample, an electron microscope SEM image at a magnification of 5000 times, 10000 times or 30000 times (for the CNF described in paragraph 0021, a magnification of 30000 times was used) depending on the width of the constituent fibers Observe. Specifically, two diagonal lines are drawn on the observation image, and three straight lines passing through the intersections of the diagonal lines are arbitrarily drawn. Furthermore, the width of a total of 100 fibers intersecting with these three straight lines is visually measured. Then, the median diameter (median diameter) of the measured values is defined as the average fiber width. Note that the average fiber width is not limited to the median diameter of the measured value, and for example, the number average diameter or the mode diameter (mode diameter) may be used as the average fiber width.

Note that the outer surface side nonwoven fabric 11, the filter 12 and the wearer side nonwoven fabric 13 are not necessarily formed to have the same size as shown in FIGS. For example, only the outer surface side nonwoven fabric 11 may be formed to be large in the vertical direction, and may be formed so as to cover the upper and lower ends of the filter 12 and the wearer side nonwoven fabric 13 and be rolled back. In this case, the strength of the upper and lower ends of the filter 12 and the wearer's side nonwoven fabric 13 can be improved.

As shown in FIGS. 2 and 3, the outer surface side nonwoven fabric 11, the filter 12, and the wearer side nonwoven fabric 13 are welded back and forth by heat, ultrasonic waves, or the like in the vicinity of the upper, lower, left, and right ends. An upper end connecting portion 1a is formed near the lower end, a lower end connecting portion 1b is formed near the lower end, a right end connecting portion 1c is formed near the right end, and a left end connecting portion 1d is formed near the left end.

A nose reinforcing member 14, which will be described later, is attached to the upper part of the mask main body 1. Therefore, as shown in FIGS. A nose reinforcing member peripheral connecting portion 1e is formed by welding the non-woven fabric 13 by heat, ultrasonic waves, or the like.
The nose reinforcing member peripheral connection portion 1e is desirably formed so as to substantially match the shape of the nose reinforcing member 14 in a front view, but there is a slight gap around the nose reinforcing member 14, It may be possible to move the nose reinforcement member 14 .

2 and 3, a filter 12 and a wearer-side nonwoven fabric are arranged to surround the mouth reinforcing member 15 in order to attach the mouth reinforcing member 15, which will be described later, near the center of the mask main body 1 in the vertical direction. 13 is welded by heat, ultrasonic waves, or the like to form a peripheral connecting portion 1f of the mouth reinforcing member.
It is desirable that the mouth reinforcing member peripheral connecting portion 1f is formed so as to substantially match the shape of the mouth reinforcing member 15 when viewed from the front. It may be possible to move the mouth reinforcing member 15 .

Further, although FIGS. 1 to 3 illustrate the case where the connecting portions 1a to 1f are provided separately, the present invention is not limited to this, and there may be portions that also serve as a plurality of connecting portions. For example, the upper end connecting portion 1a and the upper portion of the nose reinforcing member peripheral connecting portion 1e may overlap, and the upper end connecting portion 1a may also serve as the upper portion of the nose reinforcing member peripheral connecting portion 1e.
Moreover, these connection portions need only be connected to the front and rear sheet materials, and need not necessarily be formed by welding using heat, ultrasonic waves, or the like.
Also, in FIGS. 1 and 2, the connecting portions are shown as solid lines, but the present invention is not limited to this, and the connecting portions may be formed as broken lines, for example.
Also, the configuration of the mask main body 1 is not limited to the one described above, and one or two or more sheet materials may be laminated, or may be formed from less than three sheet materials.

(pleats)
The mask main body 1 is folded vertically as shown in FIG. 3, thereby forming an upper pleat 1g and lower pleats 1h, 1h on the front side as shown in FIGS. It is When the mask 100 is worn, by unfolding these in the vertical direction, the mask main body 1 becomes a three-dimensional mountain-shaped shape that bulges outward, so that the nose, mouth, chin, etc. of the wearer's face are covered. It has become.

As shown in FIGS. 1 to 3, the upper pleat 1g is an upwardly convex fold formed above the center of the front face of the mask body 1 in the vertical direction, and can be expanded in the vertical direction. . In this embodiment, the upper pleat 1g is provided at one location on the mask main body 1. As shown in FIG.

As shown in FIGS. 1 to 3, the lower pleats 1h, 1h are folds formed below the central portion in the vertical direction of the front surface of the mask body 1 and protruding downward, and are expanded in the vertical direction. can be done. In this embodiment, the lower pleats 1h, 1h are provided at two locations on the mask main body 1. As shown in FIG.

In the upper pleat 1g and the lower pleats 1h, 1h, the interval between the upper pleat 1g and the lower pleats 1h, 1h formed upward, including the central portion in the vertical direction of the mask main body 1, is the largest. It is desirable that the portion is arranged so as to be wide, and in particular, that the portion is arranged so as to have a width of one-third or more of the width of the mask main body 1 in the vertical direction. This makes it easier to secure a space around the wearer's mouth.

Moreover, it is desirable that the upper pleat 1g and the lower pleats 1h, 1h are arranged so that the arrangement intervals thereof are all different intervals. This makes it possible to change the arrangement interval for each pleat and arrange it at an appropriate position.
The arrangement interval of the pleats includes the interval between the upper pleat 1g and the upper edge of the mask and the interval between the lower pleats 1h and 1h formed below and the lower edge of the mask.

(Nose reinforcement member)
The nose reinforcing member 14 is for the upper part of the mask main body 1 to conform to the shape of the vicinity of the nose of the wearer so as not to create a gap, and as shown in FIG. provided along the top edge.
The nose reinforcing member 14 is a member having flexibility that is long in the left-right direction, is shorter than the width of the mask main body 1, has a length of 80 to 135 mm in the left-right direction, preferably 90 mm to 120 mm, and It is formed to have a width of 3 mm to 5 mm and a thickness of 0.5 mm to 1.0 mm in the longitudinal direction.

As the material of the nose reinforcing member 14, any material having plasticity can be used. For example, polypropylene resin, polyethylene resin, polyester resin, etc. are used, and polypropylene resin is most preferably used.

The nose reinforcing member 14 is arranged between the filter 12 and the wearer-side nonwoven fabric 13 , and the outer surface-side nonwoven fabric 11 , the filter 12 and the wearer-side nonwoven fabric 13 are heated above, below, and to the left and right of the nose reinforcing member 14 . It is attached to the mask main body 1 by a nose reinforcing member peripheral connecting portion 1e formed so as to surround the nose reinforcing member 14 by welding back and forth using ultrasonic waves or the like.

Note that the nose reinforcing member 14 can be attached to the mask body 1 by any arrangement and attachment method as long as it is possible to prevent the formation of a gap in the upper portion of the mask body 1 .
For example, similar to the later-described mouth reinforcing member 15, the nose reinforcing member peripheral connecting portion 1e may be formed so that the outer nonwoven fabric 11 is not welded, and the nose reinforcing member 14 may be attached to the mask main body 1. . Further, for example, the nose reinforcing member 14 may be arranged between the outer nonwoven fabric 11 and the filter 12 .

(Mouth reinforcement member)
The mouth reinforcing member 15 is for maintaining the shape of the mask body 1 near the wearer's mouth, and as shown in FIGS. It is attached near the central portion in the vertical direction of the mask main body 1 between the pleats 1h, 1h that are formed upward.
As for the mounting position of the mouth reinforcing member 15, it is preferable that the mouth reinforcing member 15 is mounted at a position shifted downward by about 5 mm to 10 mm from the center of the mask body 1 in the vertical direction, thereby widening the space near the lower lip of the wearer. Although it is desirable because it can be secured, it is sufficient if the shape of the mask main body 1 in the vicinity of the wearer's mouth can be maintained, and the arrangement position is not limited to such.

The mouth reinforcing member 15 is a member having plasticity that is elongated in the left-right direction, and as shown in FIG. It is formed to have a width of 3 mm to 5 mm in the vertical direction and a thickness of 0.5 mm to 1.0 mm in the front-rear direction.

As the material of the mouth reinforcing member 15, any material having plasticity can be used. , polypropylene resin is used.

As shown in FIG. 3 , the mouth reinforcing member 15 is arranged between the filter 12 and the wearer-side nonwoven fabric 13 . , it is attached to the mask main body 1 by the mouth reinforcing member peripheral connecting portion 1f formed so as to surround the mouth reinforcing member 15 by welding back and forth using heat, ultrasonic waves, or the like.
As a result, the mouth reinforcing member 15 is fixed to the filter 12 and the wearer-side nonwoven fabric 13, and the filter 12, the wearer-side nonwoven fabric 13, and the mouth reinforcing member 15 are fixed near the wearer's mouth. However, the outer surface side nonwoven fabric 11 is not fixed to other members except near the ends of the four sides of the mask main body 1 .

As the mask main body 1, any configuration can be used as long as it can cover the target part of the wearer and function as a mask when the ear hooks are attached.

≪Ear hook section≫
The right ear hook portion 2 and the left ear hook portion 3 are string-like members formed of polyurethane or the like, for example. 1 is provided on the left side. The right ear hook portion 2 and the left ear hook portion 3 are attached to the end portions of the mask main body portion 1 by welding, for example, with heat, ultrasonic waves, or the like.

[Description of manufacturing method]
(1) A cellulose nanofiber dispersion is spray-coated on the nonwoven fabric 13 on the wearer's side. In the case of spray coating, the viscosity of the cellulose nanofiber dispersion is temporarily lowered to such an extent that the dispersion can be sprayed. Dip coating may be performed instead of spray coating. Alternatively, the cellulose nanofiber dispersion may be transferred to the nonwoven fabric 13 on the wearer's side using a printer. When the cellulose nanofiber dispersion is applied, it may be applied to only one surface of the nonwoven fabric 13 on the wearer's side, or may be applied to both surfaces.
(2) In order from the farthest side from the wearer's face, the sheet material is stacked in the order of the outer nonwoven fabric 11, the filter 12, and the wearer's nonwoven fabric 13, and the predetermined space between the filter 12 and the wearer's nonwoven fabric 13 The nose reinforcing member 14 and the mouth reinforcing member 15 are placed in position.
(3) The outer surface side nonwoven fabric 11, the filter 12 and the wearer side nonwoven fabric 13 are welded back and forth using heat, ultrasonic waves, etc. on the top, bottom, left and right of the nose reinforcing member 14, and the nose reinforcing member peripheral connecting portion 1e is formed. Form. In addition, the filter 12 and the wearer-side nonwoven fabric 13 are welded back and forth using heat, ultrasonic waves, etc. on the top, bottom, left and right of the mouth reinforcing member 15 to form the mouth reinforcing member peripheral connecting portion 1f.
(4) The stacked sheet materials are folded so as to form an upper pleat 1g and lower pleats 1h, 1h.
(5) The vicinity of the upper and lower and left and right ends of the folded sheet material is welded back and forth using heat, ultrasonic waves, etc., and the upper end connection part 1a, the lower end connection part 1b, the right end connection part 1c and the left end are welded. 1d is formed.
(6) Both ends of the right ear hook portion 2 are welded to the top and bottom of the right end portion of the sheet material using heat, ultrasonic waves, etc., and both ends of the left ear hook portion 3 are welded to the top and bottom of the left end portion of the sheet material. It is welded using heat, ultrasonic waves, or the like.

[Explanation of effect]
The mask 100 according to the embodiment is formed of a sheet material, and includes a mask main body 1 that covers a target portion of the wearer's face, and a pair of left and right ear hooks for locking the mask main body 1 to the wearer's ears. A mask 100 having portions 2 and 3, in which cellulose nanofibers are applied to the wearer-side surface of the mask main body 1. FIG. As a result, the moisturizing function of the face of the mask main body 1 on the wearer's side can be enhanced, so that the moisturizing property of the mask can be improved and the formation of water droplets due to exhalation can be suppressed.

The mask main body 1 includes a wearer-side nonwoven fabric 13 closest to the wearer's skin, an outer nonwoven fabric 11 farthest from the wearer's skin, the wearer-side nonwoven fabric 13 and the outer nonwoven fabric. 11 and the filter 12 provided between the filter 11 and the filter 12 are respectively laminated, and the wearer-side nonwoven fabric 13 is coated with cellulose nanofibers. As a result, the moisturizing function of the surface of the wearer-side nonwoven fabric 13 can be enhanced, so that the moisturizing property of the mask can be improved and the generation of water droplets due to exhalation can be suppressed.

In addition, since the mask 100 has 2 to 8% by weight of cellulose nanofiber applied to the nonwoven fabric 13 on the wearer's side, it is possible to further improve the moisturizing property of the mask.

Cellulose nanofibers are applied to the wearer-side nonwoven fabric 13 of the mask 100 of this embodiment.
Hereinafter, the results of the moisture content measurement test performed on the nonwoven fabric coated with the cellulose nanofibers will be described.

<Sample creation>
First, 11 sheets of nonwoven fabric (100 mm long×100 mm wide) used for the nonwoven fabric 13 on the wearer's side were prepared.
Next, the coating amount (content) of cellulose nanofiber is 0.2 wt%, 1 wt%, 2 wt%, 3 wt%, 4 wt%, 5 wt%, 6 wt%, 8 wt%, and 10 wt%, respectively. A 2% dispersion of cellulose nanofibers was spray-coated on each of 10 non-woven fabrics so as to have a concentration of 15% by weight. The remaining one nonwoven fabric was left as it was without being spray-coated with the cellulose nanofiber dispersion.

<Moisturizing amount measurement test>
First, after measuring the weight of each sample described above (sheet weight before the test), each sample was placed in a constant temperature and humidity chamber at a humidity of 90% and a temperature of 40° C. for 1 hour. Then, after 10 minutes from the rest for 1 hour, the weight of each sample (seat weight at 10 minutes after the test) was measured again, and the weight change amount and weight change rate of each sample were calculated.
The test results are shown in Table 1 and FIG.

As shown in Table 1 and FIG. 4, it was found that the weight change rate was 1% or more when the coating amount (content) of the cellulose nanofibers was 2 to 10% by weight. It was also found that the weight change rate was highest when the coating amount was 4% by weight, and that the weight change rate decreased after 8% by weight. Furthermore, it was found that the sample becomes hard when the coating amount is 8% by weight or more.
In this way, the present inventor found that it is preferable to apply 2 to 8% by weight of cellulose nanofibers to the nonwoven fabric 13 on the wearer's side, and particularly preferably 4% by weight.

100 Mask 1 Mask main body 11 Outer surface side nonwoven fabric (outer surface side sheet material)
12 filter 13 wearer-side nonwoven fabric (wearer-side sheet material)

Claims (3)

A mask comprising a mask main body made of a sheet material and covering a target portion of a wearer's face, and a pair of left and right ear hooks for engaging the mask main body with the wearer's ears ,
The mask main body includes at least a wearer-side sheet material closest to the wearer's skin, an outer surface-side sheet material farthest from the wearer's skin, the wearer-side sheet material, and the outer surface. A filter provided between the side sheet material and a filter are laminated,
The wearer-side sheet material is coated with cellulose nanofibers,
A mask , wherein the cellulose nanofiber is applied in an amount of 2 to 8% by weight to the wearer-side sheet material . 2. The mask according to claim 1 , wherein the filter is coated with cellulose nanofibers. A method for manufacturing a mask according to claim 1 or 2 ,
A method for manufacturing a mask, comprising applying a cellulose nanofiber dispersion to the wearer-side sheet material.

Images