CN216533928U - Mask sheet, wound body, and mask - Google Patents

Abstract

The utility model provides a mask sheet, a roll body and a mask. The mask sheet (10) comprises1 fiber layer (11) and 2 nd fiber layer (12). The average fiber diameter of the constituent fibers of the 2 nd fiber layer (12) is larger than the average fiber diameter of the constituent fibers of the 1 st fiber layer (11). The average fiber diameter of the constituent fibers of the 1 st fiber layer (11) is 0.2 to 2 [ mu ] m. The grammage of the 1 st fiber layer (11) is 2g/m²Above 20g/m²The following. The ratio of the grammage of the 2 nd fiber layer (12) to the grammage of the 1 st fiber layer (11) is greater than 0 and less than 8, and the mask sheet (10) has a mouth-corresponding region (A) disposed so as to correspond to the position of the mouth of the user in a plan view, and has a joining portion for joining the fiber layers (11, 12) to each other. The mask (1) uses the mask sheet (10) as a detachable filter sheet or as a mask body (5).

Description

Sheets, wraps and masks for masks

technical field

The utility model relates to a mask sheet and a mask with the same.

Background technique

As a mask which covers a user's mouth and nose, for example, a mask having a mask body formed of a sheet such as a nonwoven fabric is known. As an effect of a mask, prevention of penetration of powder, dust, viruses, pollen, etc. from the outside can be mentioned. In order to obtain this effect, Patent Document 1 discloses a mask in which a mask body portion is constituted by a plurality of electret-treated fiber sheets. In addition, in Patent Documents 2 and 3, masks each having a mask body having a nanofiber layer are disclosed.

prior art literature

Patent Literature

Patent Document 1: Japanese Patent Laid-Open No. 2009-273726

Patent Document 2: Japanese Patent Laid-Open No. 2015-196263

Patent Document 3: Japanese Patent Laid-Open No. 2018-172806

SUMMARY OF THE INVENTION

Technical Problems to be Solved by Utility Models

None of the masks described in Patent Documents 1 to 3 can sufficiently achieve both the collection performance of fine particles and the improvement of the feeling of use.

The utility model relates to a mask sheet for improving both the collection performance of fine particles and the feeling of use.

Technical solutions for solving technical problems

The utility model provides a mask sheet, which comprises a first fiber layer and a second fiber layer arranged on one side of the first fiber layer,

The average fiber diameter of the fibers constituting the second fiber layer is larger than the average fiber diameter of the fibers constituting the first fiber layer,

The fibers constituting the first fiber layer have an average fiber diameter of 0.2 μm or more and 2 μm or less,

The basic weight of the first fiber layer is 2 g/m ² or more and 20 g/m ² or less,

The ratio of the basic weight of the second fiber layer to the basic weight of the first fiber layer is greater than 0 and less than 8.

In addition, the utility model provides a mask sheet, which comprises a first fiber layer and a second fiber layer arranged on one surface side of the first fiber layer,

The average fiber diameter of the fibers constituting the second fiber layer is larger than the average fiber diameter of the fibers constituting the first fiber layer,

The fibers constituting the first fiber layer have an average fiber diameter of 0.2 μm or more and 2 μm or less,

It has a mouth-corresponding region arranged to correspond to the position of the mouth of the user in plan view,

In a plan view, in a range of 20 mm×20 mm in the mouth corresponding region, the mouth corresponding region has one or more junctions for joining the first fiber layer and the second fiber layer,

In a plan view, the total area of the joints exceeds 0% of the area of the mouth-corresponding region and is less than or equal to 2% of the mouth-corresponding region.

Utility model effect

According to the present invention, it is possible to provide a mask sheet and a mask provided with the mask sheet, which have both fine particle collection performance and improved usability.

Description of drawings

Fig. 1 is an exploded perspective view schematically showing one embodiment when the mask sheet of the present invention is used.

Fig. 2 is an exploded perspective view schematically showing another embodiment when the mask sheet of the present invention is used.

It is a top view which shows typically another embodiment of the sheet|seat for masks of this invention.

It is sectional drawing which shows typically one Embodiment of the sheet|seat for masks of this invention.

5 is a cross-sectional view schematically showing another embodiment of the mask sheet of the present invention.

It is sectional drawing which shows typically another embodiment of the sheet|seat for masks of this invention.

It is a perspective view which shows typically one Embodiment of the manufacturing apparatus of the sheet|seat for masks of this invention.

It is a perspective view which shows typically one Embodiment when making the sheet|seat for masks of this invention into a winding body.

It is a perspective view which shows typically another embodiment when the sheet|seat for masks of this invention is made into a winding body.

Detailed ways

Hereinafter, the present invention will be described based on preferred embodiments with reference to the accompanying drawings. The mask sheet of the present invention covers the user's mouth and nose when in use, and is used to prevent foreign matter such as fine particles from invading from the mouth and nose.

In FIG. 1 and FIG. 2, one Embodiment at the time of using the sheet|seat for masks of this invention is described. The mask sheet 10 shown in FIG. 1 is a so-called pad type mask sheet, and is typically a filter sheet. Specifically, the mask 1 shown in the figure has a separate mask body 5 and a mask sheet 10 , and the mask sheet 10 is used as a filter detachable from the mask body 5 . In the present embodiment, when the mask 1 is used, the mask sheet 10 is placed between the mask body 5 and the user as a filter, and is arranged so as to face the user's mouth and nose, so that the mouth can be covered. ,nose.

As a mode different from this embodiment, for example, the mask sheet 10 and the mask main body 5 may be constituted as separate bodies, and the mask main body 5 may be provided with a sheet holding portion capable of accommodating and taking out the mask sheet 10, and the mask sheet 10 is detachable relative to the mask body 5. In this case, the mouth and nose can be covered by arranging the mask body 5 in which the mask sheet 10 is accommodated so as to face the user's mouth and nose.

The mask sheet 10 shown in FIG. 2 is a so-called integrated mask sheet. In detail, the mask 1 shown in this figure has the sheet|seat 10 for masks as the mask main body 5 itself. In the present embodiment, when the mask 1 is used, the mouth and nose can be covered by arranging the mask sheet 10 serving as the mask body 5 so as to face the user's mouth and nose.

As shown in FIGS. 1 and 2 , the mask 1 includes a mask body 5 and a pair of hanging ears 6 and 6 . It is preferable that the mask main body 5 is a rectangle which has a longitudinal direction and the width direction orthogonal to this direction. The hanging ears 6 are arranged on the peripheral edge of the mask body 5, preferably at a position outside the mouth corresponding region A in plan view, and more preferably at both outer end regions in the length direction of the mask body 5. Thereby, the ear-hook portions 6 and 6 are respectively hooked to the ears of the user, and the covering state in which the mouth and nose of the user are covered by the mask body 5 can be maintained. In the case of the mask 1 shown in FIG. 1, the hanging ears 6 and 6 are joined to the peripheral edge part of the mask main body 5, and are not joined to the mask sheet 10. In the case of the mask 1 shown in FIG. 2, the hanging ear parts 6 and 6 are directly joined to the peripheral edge part of the mask sheet 10 which is the mask body 5.

In FIG. 3, the other embodiment of the sheet|seat 10 for masks which is an integrated type is shown. Similar to the embodiment shown in FIG. 2 , the mask 1 shown in this figure is a two-fold type mask having the mask sheet 10 as the mask body 5 itself. Both the pair of hanging ear parts 6 and 6 in the present embodiment are made of sheets, and are directly joined so as to extend from the peripheral edge of the mask sheet 10 serving as the mask body 5 . In the center region of the ear-hanging portion 6, a hole for passing the ear-through portion 6A when the ear-hanging portion 6 is hooked to the ear is formed.

The mask 1 of the embodiment shown in FIG. 3 includes the first main body portion 21 as the mask sheet 10 and the second main body portion 22 as the mask sheet 10, and the main body portions 21 and 22 are arranged so as to be connected to form a mask main body. 5. The main-body part joining part 15 which joins the main-body parts 21 and 22 mutually is formed in the linear shape extended in one direction in the connection part of this main-body part 21,22. The main body part joint part 15 functions as a flexible shaft when the mask main body 5 is folded in half. The first body portion 21 and the second body portion 22 have substantially the same shape in plan view, and have a line-symmetric shape with the body portion joint portion 15 as an axis. Thereby, using the main-body part joint part 15 as a flexible shaft, the mask main body 5 can be three-dimensionally closely attached so that it may fit the convex shape of a mouth and a nose.

In the case of using the mask sheet 10 as a filter sheet and using the mask sheet 10 as the mask body 5, the mask sheet 10 is typically a rectangle with a width direction whose longitudinal direction is orthogonal to this direction, It is preferable to arrange|position so that the longitudinal direction of the sheet|seat 10 for masks and the longitudinal direction of the mask 1 may mutually correspond.

In the mask main body 5 of the embodiment shown in FIG. 1 , a plurality of gathers are formed so as to extend in one direction. Thereby, the mask main body 5 can be extended, and the nose, the mouth, and its surroundings can be widely covered with one mask. Alternatively, the mask body 5 may not form pleats.

Moreover, the sheet|seat 10 for masks in embodiment shown in FIG. 1 does not have a gather. Instead of this, the sheet|seat 10 for masks in this embodiment may be comprised so that several gathers may be formed so that it may extend in one direction, and the sheet|seat 10 for masks may be stretched.

The sheet|seat 10 for masks which is the mask main body 5 of embodiment shown in FIGS. 2 and 3 does not have gathers. Instead of this, the sheet|seat 10 for masks in this embodiment may be comprised so that several gathers may be formed so that it may extend in one direction, and the sheet|seat 10 for masks may be stretched.

Hereinafter, one Embodiment of the structure of the sheet|seat 10 for masks is demonstrated. In FIG. 4, one Embodiment at the time of the thickness direction cross-sectional view of the sheet|seat 10 for masks is shown typically. The sheet|seat 10 for masks is the sheet of the multilayer structure which integrated the 1st fiber layer 11 and the 2nd fiber layer 12 provided in the one surface side of the 1st fiber layer 11. In the embodiment shown in FIG. 4 , the fiber sheet has a two-layer structure in which the fiber layers 11 and 12 are arranged adjacent to each other, and the second fiber layer 12 is arranged over the entire region on the one surface side of the first fiber layer 11 . . In this embodiment, no other layer is provided between the two fiber layers 11 and 12 , but another layer may be provided between the two fiber layers 11 and 12 . It is preferable that the sheet|seat 10 for masks is inelastic as a whole.

The mask sheet 10 includes a first surface F and a second surface R, which is a surface located on the opposite side of the first surface F. In the present embodiment, the first fiber layer 11 includes the first surface F, and the second fiber layer 12 includes the second surface R. When using the mask sheet 10, the second surface R of the mask sheet 10 is preferably disposed on the skin-opposite side, which is the surface facing the nose and mouth of the user, and the first surface F is preferably disposed on the opposite side of the skin-opposing surface. The face is the side that is not the opposite of the skin. When using the sheet|seat 10 for masks as a filter, it is preferable to arrange|position so that the 1st surface F may oppose the mask main body 5. When using the sheet|seat 10 for masks as the mask main body 5 itself, it is preferable that the 1st surface F constitutes the outer surface of the mask 1.

In the relationship between the fibers constituting the first fiber layer 11 and the fibers constituting the second fiber layer 12, the average fiber diameter of the fibers constituting the second fiber layer 12 is preferably larger than the average fiber diameter of the fibers constituting the first fiber layer 11. That is, the mask sheet 10 can include, in one sheet, the first fiber layer in which the fiber density is high by using fibers with relatively small fiber diameters, and the first fiber layer in which the fiber density is high by using fibers with relatively large fiber diameters. There is a second fibrous layer of lower density.

In general, the first fiber layer with a high density of fibers can effectively trap foreign particles such as dust, pollen, and viruses between fibers even with a small grammage. The sheet strength that can withstand actual use of the mask sheet cannot be sufficiently achieved. On the other hand, when it is desired to constitute the mask sheet only by the first fiber layer, it is necessary to increase the basic weight of the first fiber layer in order to fully realize the sheet strength that can withstand actual use of the mask sheet. As a result, it is not possible to ensure air permeability to the extent that the user of the mask sheet can breathe easily, and the usability of the mask sheet is deteriorated.

In order to achieve the opposite goals as described above at the same time, by including a second fiber layer with a low density of fibers in addition to the first fiber layer, it is possible to obtain a sufficiently high sheet strength by the second fiber layer, and at the same time as the second fiber layer. The sheet 10 for masks of improved fine particle foreign matter collection performance of 1 fiber layer and moderate air permeability. Therefore, when a mask having the mask sheet 10 is used, not only can fine particles and foreign substances be sufficiently captured, but also the feeling of stuffiness during use can be reduced and breathing can be easily performed, so that the mask sheet and the mask having the mask sheet can be improved. sense of use.

Specifically, the average fiber diameter D1 of the fibers constituting the first fiber layer 11 in the mask sheet 10 is preferably 0.2 μm from the viewpoint of ensuring adequate air permeability and allowing the user of the mask sheet 10 to breathe easily. Above, more preferably 0.3 μm or more, more preferably 0.4 μm or more.

The average fiber diameter D1 is preferably 2 μm or less, more preferably 1.5 μm or less, more preferably 1 μm or less, and still more preferably 0.6 μm or less, from the viewpoint of improving the trapping performance of foreign particles.

In addition, regarding the average fiber diameter D2 of the fibers constituting the second fiber layer 12 in the mask sheet 10, it is a condition that the average fiber diameter D1 of the fibers constituting the first fiber layer is larger than the average fiber diameter D1 of the fibers constituting the first fiber layer. From the viewpoint of fully expressing and fully exhibiting the strength that can withstand actual use as a mask sheet, it is preferably 5 μm or more, more preferably 8 μm or more, and more preferably 10 μm or more.

The average fiber diameter D2 under the same conditions is preferably 30 μm or less, more preferably 25 μm or less, and more preferably 20 μm or less, from the viewpoint of taking into account the usability of the mask sheet and the strength of the sheet to withstand actual use.

The average fiber diameters D1 and D2 of the fibers constituting the first fiber layer 11 and the second fiber layer 12 can be measured with a scanning electron microscope (SEM) as the maximum span dimension in the fiber cross section perpendicular to the fiber longitudinal direction. The specific measurement sequence is as follows.

First, it is confirmed whether or not the sheet for masks can be peeled off, and if it is peelable, the constituent sheets of the sheet for masks are carefully peeled off to confirm the layer structure. Then, the fiber diameter of each fiber layer was measured.

The fiber diameter was measured by arbitrarily selecting 500 out of 500 defects of spun fibers, intersections of fibers, polymer droplets, etc., from a two-dimensional image obtained by SEM observation of each fiber layer. For the outer fibers, the fiber diameter was measured by directly reading the length of the fiber when a line orthogonal to the longitudinal direction was drawn as the fiber diameter. From the frequency distribution (histogram) of the measured fiber diameters, the median fiber diameter at which the cumulative frequency is 50% of the whole was determined, and this was taken as the average fiber diameter of each fiber.

In the case where the constituent fiber layers of the mask sheet are two, the fiber layer having a relatively small fiber diameter measured by the above-mentioned method among the respective fiber layers is designated as the first fiber layer 11, and the other fiber layer is designated as the first fiber layer 11. 2 fiber layers 12.

As will be described later, when the constituent fiber layers of the mask sheet are three, the fiber layer with the smallest fiber diameter measured by the above-described method among the respective fiber layers is used as the first fiber layer 11 . Then, one layer arranged adjacent to the first fiber layer 11 is referred to as the second fiber layer 12 , and the other layer other than the first fiber layer 11 and the second fiber layer 12 is referred to as the third fiber layer 13 .

When the constituent fiber layers of the mask sheet are four or more layers, the fiber layer with the smallest fiber diameter measured by the above-mentioned method is used as the first fiber layer 11, and the outer surface of the mask sheet on one side is used as the first fiber layer 11. The fiber layer is the second fiber layer 12, and the layer adjacent to the first fiber layer 11 and away from the second fiber layer is the third fiber layer.

When the constituent sheet of the mask sheet has a multi-layer structure that cannot be peeled off, 500 fibers are selected from one side and the other side of the constituent sheet, and based on the median fiber diameter measured by the above-mentioned method, 500 fibers including The fiber diameter in the fiber layer on the surface on the smaller fiber diameter side is referred to as the first fiber diameter D1, and the fiber diameter in the fiber layer including the surface on the larger fiber diameter side is referred to as the second fiber diameter D2.

The above-mentioned method of confirming the fiber layer and the method of measuring the average fiber diameter can be similarly applied to other measurement methods in the specification of the present invention.

In addition, in the relationship between the basic weight of the first fiber layer 11 and the basic weight of the second fiber layer 12, the ratio of the basic weight M2 of the second fiber layer 12 to the basic weight M1 of the first fiber layer 11 (M2/ M1) is within the specified range. Specifically, the ratio (M2/M1) of the basic weight M2 of the second fiber layer 12 to the basic weight M1 of the first fiber layer 11 is preferable from the viewpoint of sufficiently exhibiting the strength of the sheet that can withstand actual use. More than 0, more preferably 0.25 or more, more preferably 0.5 or more, still more preferably 1 or more, still more preferably 2 or more.

From the viewpoint of further improving the feeling of use such as moderate air permeability of the mask sheet, the ratio (M2/M1) of the basic weight M2 of the second fiber layer 12 to the basic weight M1 of the first fiber layer 11 is preferably less than 8 , more preferably 7.5 or less, more preferably 7 or less. By setting such a range, the mask 1 having the mask sheet 10 can be formed thin, so that the usability of the mask can be improved, and the usability of the mask sheet and the mask having the mask sheet can be improved.

Specifically, the basic weight M1 of the first fiber layer 11 in the mask sheet 10 is preferably 2 g/m ² or more, more preferably 2.5 g/m ² or more, more preferably 3 g/m ² or more, and preferably 20 g /m ² or less, more preferably 18 g/m ² or less, more preferably 15 g/m ² or less, still more preferably 8 g/m ² or less. By making the basic weight M1 in such a range, it is possible to effectively achieve both the improvement of the collection performance of fine particles and the improvement of the usability by making the mask 1 having the mask sheet 10 thinner.

In addition, the basic weight M2 of the second fiber layer 12 in the mask sheet 10 is preferably 5 g/m ² or more, more preferably 10 g/m ² or more, more preferably 15 g/m ² or more, and preferably 30 g/m ² Below, it is more preferable that it is 25 g/m ² or less, and it is more preferable that it is 20 g/m ² or less. By setting the grammage M2 in such a range, the thickness of the mask can be reduced, the usability of the mask can be improved, and the moderate ventilation of the mask can be realized, the feeling of stuffiness during use of the mask can be reduced, and breathing can be more easily performed. As a result, the usability of the mask sheet 10 and the mask provided with the mask sheet 10 can be further improved.

The grammage M1 of the 1st fibrous layer 11 in the mask sheet 10 and the grammage M2 of the 2nd fibrous layer 12 are calculated in the following manner: determine the existence of each fibrous layer by the above-mentioned method, after each fibrous layer is separated, separate the Each of the obtained fiber layers was cut into 20 mm squares, and the mass (g) was divided by the cut sheet area (400 mm ² =0.0004 m ² ) to calculate.

5, another embodiment of the structure of the sheet|seat 10 for masks is demonstrated. In the following description, parts different from those of the above-described embodiments will be mainly described, and the same components are denoted by the same reference numerals, and descriptions thereof will be omitted. For components that are not particularly described, the description of the above-mentioned mask sheet is appropriately adopted.

The mask sheet 10 of the embodiment shown in FIG. 5 is a fiber sheet having a multilayer structure of the first fiber layer 11 and the second fiber layer 12 as in the above-described embodiment shown in FIG. 4 . The sheet|seat 10 for masks shown in FIG. 5 has one or two or more joining parts B which join the 1st fiber layer 11 and the 2nd fiber layer 12. The joint portion B is formed by crimping, adhering, or welding the fiber layers to each other. In the joint portion B, there is no boundary interface between the fiber layers 11 and 12, or the boundary interface is not conspicuous. Moreover, the junction part B may be formed in the whole area|region of the sheet|seat 10 for masks in plan view, and may be formed in only a partial area|region. It is preferable to form a junction part by heat fusion from a viewpoint of making the flexibility and strength of a sheet|seat compatible and improving a usability more.

The junction part B is formed in a linear shape or a scattered point shape when the sheet|seat 10 for masks is planarly viewed. When the joint portion is formed in a linear shape, it may be a continuous line or a discontinuous line, or may be a straight line or a curved line. When the junctions are formed in a scattered shape, the plan shape of the junctions may be circular shapes such as perfect circles and ovals, polygonal shapes such as rectangles and hexagons, letter shapes such as X and Y, and lattices. shape or a combination thereof.

The mask sheet 10 of the present embodiment has a mouth-corresponding region A (see FIGS. 1 , 2 and 3 ) arranged to correspond to the position of the user's mouth in a plan view (plan view). The mouth corresponding area A is when the center of gravity (the center of gravity of the plane figure) in the top view of the mask sheet 10 is consistent with the center of gravity in the top view of a similar shape obtained by reducing the plane area of the mask sheet 10 to 70%, the The area represented by the top-view shape of the analogous shape. That is, the mouth-corresponding region A is located in the central region in the plan view of the mask sheet 10 . When the plan view area of the first fiber layer 11 and the plan view area of the second fiber layer 12 are different from each other, the mouth-corresponding region A is a similar shape based on the plan view shape and maximum area of the mask sheet 10.

When the mask sheet 10 is, for example, a mask of a folded type as shown in FIG. 3 , the mouth-corresponding region A is each region based on the plan view of each main body portion 21 and 22 . More specifically, the mouth corresponding area A is such that the center of gravity of each of the main body parts 21 and 22 in plan view coincides with the center of gravity in a plan view of a similar shape obtained by reducing the plane area of each of the main body parts 21 and 22 to 70% , the area represented by the top-view shape of the similar shape. That is, in the case of a half-folded type mask, one mouth corresponding area A exists in each main body, and a plurality of mouth corresponding areas A exist when viewed as the mask main body 5 .

Moreover, when the gathers are formed in the sheet|seat 10 for masks, the mouth part correspondence area|region A is the area|region based on the plane area when the gathers are extended to the maximum.

When the mask sheet 10 of the present embodiment has the mouth-corresponding region A and the joint portion B as described above, it is preferable that the number and area of the joint portion B existing in the mouth-corresponding region A have a predetermined relationship. Typically, the number and area of the bonding portion B are preferably small from the viewpoint of sufficiently exhibiting various functions related to the improvement of the usability of the mask sheet embodied by each fiber layer and the mask having the mask sheet. On the other hand, from the viewpoint of securing the overall strength of the mask sheet 10, it is preferable that the number and area of the joint portion B be large. Therefore, by having a predetermined relationship between the number and area of the junctions B existing in the mouth corresponding region A, it is possible to achieve both the fine particle trapping performance of each fiber layer and the securing of appropriate air permeability, and it is possible to achieve both. The strength of the mask sheet that can withstand actual use is fully exerted. In addition, by forming at least the joint portion B in the mouth-corresponding region A, it is possible to reduce fluffing of fibers constituting the fiber layer facing the user's mouth, and it is possible to reduce the intrusion of the fluffed fibers into the mouth of the user or contact with the nose of the user. Discomfort caused by contact with around the mouth. As a result, the usability of the mask sheet 10 and the mask provided with the mask sheet 10 can be improved.

Specifically, as for the number of the junction parts B, in the range of 20 mm×20 mm in the mouth corresponding region A when the sheet 10 for masks is viewed in plan, the junction part B is preferably one or more, and more preferably five or more. , more preferably 10 or more, and preferably 50 or less, further preferably 40 or less, and more preferably 30 or less. By making the number of objects of a junction part into such a range, the usability of the mask sheet 10 and the mask provided with the mask sheet 10 can be further improved. The outer region of the mouth-corresponding region A in the plan view of the mask sheet 10 may or may not have the junction B.

In addition, with regard to the area of the joint portion B, in the mouth-corresponding region A in the plan view of the mask sheet 10, the percentage of the total plane area of the joint portion B relative to the plane area of the mouth-corresponding region A is preferably greater than 0%, It is more preferable that it is 0.05% or more, and it is preferable that it is 2% or less, and it is still more preferable that it is 1% or less. By making the area ratio of a junction part into such a range, the collection performance and usability of the fine particle of the mask sheet 10 and the mask provided with the mask sheet 10 can be further improved.

The average area per joint portion B is preferably 0.1 mm ² or more, more preferably 0.15 mm ² or more, and preferably 3 mm ² or less, further preferably 1 mm ² or less. By making the average area of the junction part B in such a range, the collection performance and usability of the fine particles of the mask sheet 10 and the mask having the mask sheet 10 can be further improved.

The number and average area of the bonding portion B can be measured by the following method. Specifically, the number of joints B formed and the area of each joint B were calculated using image processing software from a two-dimensional image obtained by observing the inside of the mouth-corresponding region A of the mask sheet 10 in plan view with SEM. Then, the number of all junctions B within the range of 20 mm×20 mm in the mouth-corresponding region A and the area of each junction B were obtained, and the arithmetic mean of the areas was taken as the average area. When the sheet|seat 10 for masks has gathers, it measures in the top view when this sheet|seat is extended|stretched to the maximum.

From the viewpoint of improving the air permeability of the mask sheet and further improving the usability of the mask, the ventilation resistance of the mask sheet is preferably 0.5 kPa·s/m or less, more preferably 0.4 kPa·s/m or less, and still more preferably 0.3 kPa·s/m or less. kPa·s/m or less, preferably 0.2 kPa·s/m or less, and lower is more preferable, but 0.05 kPa·s/m or more is practical. The smaller the ventilation resistance, the higher the ventilation. With regard to the ventilation resistance, an air permeability measuring instrument (KES-F8-AP1, manufactured by KESKATO Co., Ltd.) was used, and the ventilation holes were sealed with the mask sheet to be measured, and the thickness of the sheet was measured at 25°C and 50% RH. Airflow resistance (kPa·s/m) when passing in the direction. In order to keep the ventilation resistance of the mask sheet in the above-mentioned range, it can be achieved, for example, by adjusting at least one of the fiber diameter, fiber diameter distribution, and basic weight in each fiber layer, and in particular, it can be achieved by adjusting the first fiber layer 11 . to achieve at least one of fiber diameter, fiber diameter distribution, and grammage. The ventilation hole area used for the measurement of ventilation resistance was 2πcm ² , the ventilation amount was 4 cc/(cm ² ·s), and the piston speed was 2 cm/s. The size of the sheet used for the measurement was 40 mm×40 mm, and the ventilation resistance value was measured for each of 10 sheets in total, and the average value of these measurement values was used as the ventilation resistance.

In addition, in the measurement of the collection rate and the ventilation resistance, it is necessary to match the measurement positions. That is, it is necessary to align the approximate centers of the respective measurement parts at 10 points where the capture rate is measured and 10 points where the ventilation resistance is measured. In addition, in both measurements, when the sheet to be measured is brought into close contact with the measurement portion, the shape of the sheet may be broken. Therefore, in order to eliminate the influence of the shape breakage of the sheet on the measurement, it is preferable to measure the ventilation resistance with a large area of the measurement part before the measurement of the collection rate.

By suppressing fluffing and unintentional shedding of constituent fibers with relatively small fiber diameters in the first fiber layer, the fine particle trapping performance is sufficiently maintained, and discomfort during use caused by fluffed fibers and shedding fibers is reduced, and further From the viewpoint of improving the sense of use of the mask sheet and the mask having the mask sheet, as shown in FIG. Layer 13.

The sheet 10 for masks shown in FIG. 6 is composed of a first fiber layer 11 , a second fiber layer 12 provided on one side of the first fiber layer 11 , and a third fiber layer provided on the other side of the first fiber layer 11 . 13 Sheets of integrated multilayer structure. In the embodiment shown in FIG. 6 , the second fiber layer 12 and the third fiber layer 13 have the first fiber layer 11 interposed therebetween, and each fiber layer 11 , 12 , and 13 is arranged adjacent to each other. The fiber sheet has a three-layer structure. , the second fiber layer 12 is arranged on the entire area on one side of the first fiber layer 11 , and the third fiber layer 13 is arranged on the entire area on the other side of the first fiber layer 11 . In the present embodiment, other layers are not provided between the fiber layers 11 and 12 and between the fiber layers 11 and 13 , but other layers may be provided between the fiber layers 11 , 12 and 13 .

The sheet|seat 10 for masks of embodiment shown in FIG. 6 is the same as the above-mentioned embodiment, and includes 1st surface F and 2nd surface R which is the surface located on the opposite side of 1st surface F. In the present embodiment, the third fiber layer 13 is configured to include the first surface F, and the second fiber layer 12 is configured to include the second surface R. When the mask 1 having the mask sheet 10 of the embodiment shown in FIG. 6 is used, in the mask sheet 10, one of the first surface F or the second surface R is preferably arranged on the skin-opposing surface side, and the other Preferably, it is arrange|positioned at the non-skin opposing surface side.

Further, in the mask sheet 10 of the embodiment shown in FIG. 6 , the average fiber diameter D3 of the fibers constituting the third fiber layer 13 is preferably larger than the average fiber diameter D1 of the fibers constituting the first fiber layer 11 . By adopting such a structure, the 1st fiber layer which expresses the trapping performance of particulate foreign matter can be reliably protected from the influence of excessive external force generated during the use of the mask sheet 10 and the mask having the mask sheet 10, and sufficient to maintain the function of the first fiber layer. In addition, since the sheet strength can be ensured by both the second fiber layer and the third fiber layer, the fiber density of the second fiber layer and the third fiber layer can be further reduced to ensure appropriate air permeability. Thereby, the usability of the mask sheet 10 and the mask provided with the mask sheet 10 can be further improved.

The average fiber diameter D3 of the fibers constituting the third fiber layer 13 can be set to be larger than the average fiber diameter D1 of the fibers constituting the first fiber layer 11 as compared with the above-described fibers constituting the second fiber layer 12 . The average fiber diameter D2 is in the same range. In the relationship between the average fiber diameter D2 and the average fiber diameter D3, the average fiber diameter D2 may be larger than the average fiber diameter D3, the average fiber diameter D2 may be smaller than the average fiber diameter D3, or the average fiber diameter D2 may be larger than the average fiber diameter D3. The average fiber diameter D3 is the same. The average fiber diameter D3 can be measured in the same manner as the above-mentioned measurement method of each of the average fiber diameters D1 and D2.

In addition, in the relationship between the basic weight of the first fiber layer 11 and the basic weight of the third fiber layer 13, the ratio of the basic weight M3 of the third fiber layer 13 to the basic weight M1 of the first fiber layer 11 (M3 /M1) is within the specified range. Specifically, the ratio (M3/M1) of the basic weight M3 of the third fiber layer 13 to the basic weight M1 of the first fiber layer 11 is preferably greater than 0, more preferably 0.25 or more, more preferably 0.5 or more, and preferably less than 8, more preferably 7.5 or less, more preferably 7 or less. By making it in such a range, even when the mask 1 having the mask sheet 10 has a multilayer structure, it can be formed thin, so that the usability of the mask can be improved, and the mask sheet and the mask having the mask can be improved. The usability of the mask of the sheet. The basic weight M3 of the third fiber layer 13 can be in the same range as the basic weight M2 of the above-described second fiber layer 12 .

It is preferable that the sheet|seat 10 for masks shown in FIG. 6 has an area|region corresponding to a mouth. In this case, the region corresponding to the mouth can be the same region as that in the above-described embodiment.

It is preferable that the sheet|seat 10 for masks shown in FIG. 6 is formed in the joining part (not shown) which joins two fiber layers at least, and this joining part is formed in the area|region corresponding to a mouth part. The joint portion is the same as or similar to the joint portion B described above, and is formed by crimping, adhering, or welding the fiber layers to each other. The bonding portion in the present embodiment may be (a) a form in which the first fiber layer 11 and the second fiber layer 12 are bonded without bonding the first fiber layer 11 and the third fiber layer 13, and (b) In order to join the first fiber layer 11 and the third fiber layer 13 without joining the first fiber layer 11 and the second fiber layer 12, (c) may be the first fiber layer 11 and the second fiber layer. 12 and the third fiber layer 13 are all joined together, or are formed in a combination of (a) to (c).

When the sheet 10 for masks shown in FIG. 6 has a junction to join at least two fiber layers, the average area of the junction takes all the junctions of the above-mentioned aspects (a) to (c) as the object, and the same as the above-mentioned The measurement method of the average area of the junction part B is the value measured in the same way.

The fibers constituting the first fiber layer 11 and the second fiber layer 12 and, if necessary, constituting the third fiber layer 13 are independent of each other, and natural fibers, synthetic fibers, and regenerated fibers can be mentioned. Examples of natural fibers include natural cellulose fibers such as pulp fibers and cotton fibers. Examples of synthetic fibers include polyolefin resins such as polyethylene and polypropylene (PP), polyester resins such as polyethylene terephthalate, polyamide resins, and vinyl resins such as polyvinyl chloride and polystyrene. , one or more fibers of thermoplastic resins such as acrylic resins such as polyacrylic acid or polymethyl methacrylate, fluororesins such as polyperfluoroethylene, and core-sheath composite fibers and side-by-side composite fibers containing the above-mentioned resin components fiber, etc. Examples of the regenerated fibers include rayon yarn, cupro yarn, tencel, and the like. These fibers can be used alone or in combination of two or more.

Among these fibers, the first fiber layer 11 and the second fiber layer 12 and, if necessary, constitute the third fiber from the viewpoint of improving the productivity of the mask sheet and improving the feeling of use, such as the feel and strength during use. As the fibers of the layer 13, synthetic fibers are preferably used independently, and each of the fiber layers 11, 12, and 13 is preferably composed of only one type of fiber, respectively.

As the fiber aggregate constituting the first fiber layer 11 and the second fiber layer 12 and, if necessary, constituting the third fiber layer 13, various fiber sheets such as paper, woven fabric, and non-woven fabric containing the above-mentioned fibers can be used independently of each other. . From the viewpoints of reducing the fluff and falling of fibers, making the hand feel good, and improving the usability of the mask sheet 10 and the mask having the mask sheet 10, it is preferable to constitute at least the surface facing the nose and mouth of the user, that is, the skin facing the user. A nonwoven fabric is used for the second fiber layer 12 of the surface, and it is more preferable to use a nonwoven fabric for both the second fiber layer 12 and the third fiber layer 13 at least.

When nonwoven fabrics are used for the respective fiber layers 11 , 12 , and 13 , hot air nonwoven fabrics, airlaid nonwoven fabrics, spunbond nonwoven fabrics, spunlace nonwoven fabrics, meltblown nonwoven fabrics, needle nonwoven fabrics, and needle nonwoven fabrics can be used. Various non-woven fabrics such as barbed non-woven fabrics and non-woven fabrics produced by electrospinning. From the viewpoint of further reducing fluff and falling of fibers, it is preferable to use a spunbond nonwoven fabric for the second fiber layer 12 and the third fiber layer 13 . In addition, it is preferable to use the fiber stack or nonwoven fabric produced by the electrospinning method for the first fiber layer 11 from the viewpoint of easily reducing the diameter of the constituent fibers. Among them, the electrospinning method is a method of spinning fibers by charging a raw material solution containing a resin as a raw material of fibers in an electric field, and releasing the charged raw material solution to an object.

When using the above-mentioned sheet 10 for masks, it is preferable that the outer surface of the 2nd fiber layer 12 or the outer surface of the 3rd fiber layer 13 is a surface which opposes a user's mouth. By arranging the mask sheet in this way, it is possible to reduce the discomfort during use due to the fluff and drop of the fibers from the first fiber layer, and to express the relatively thick fibers of the second fiber layer 12 or the third fiber layer 13 . As a result of the improvement of the texture brought about, the usability of the mask sheet 10 and the mask having the mask sheet 10 can be improved. Specifically, in the case of the mask sheet 10 shown in FIGS. 4 and 5 , it is preferable to arrange the second surface R, which is the outer surface of the second fiber layer 12, as a surface facing the mouth of the user. In addition, in the case of the mask sheet 10 shown in FIG. 6, it is preferable to use either the first surface F which is the outer surface of the third fiber layer 13 or the second surface R which is the outer surface of the second fiber layer 12. Or, it is arrange|positioned so that it may face the user's mouth.

The thickness T1 (see FIGS. 4 to 6 ) of the mask sheet 10 is preferably 0.2 mm or more, more preferably 0.4 mm or more, and more preferably 3 mm or less, further preferably 2 mm or less. By making thickness T1 into such a range, since the thickness of a sheet|seat is thin and usability is favorable, it is excellent in usability. The thickness T1 of the mask sheet 10 is 5 or more pieces under a load of 3.7 gf/m ² (36.3 mN/m ² ), based on JISK6402, using a constant pressure thickness gauge (manufactured by TECLOCK Co., Ltd., model PG-11). The thickness of the part is measured, and the arithmetic mean of the thickness is set as the thickness T1. When the sheet|seat 10 for masks has gathers, it measures based on the actual thickness of the sheet|seat in the state which extended this sheet|seat to the maximum.

The grammage of the entire mask sheet 10 is preferably 30 g/m ² or more, and preferably 100 g/m ² or less.

Others may be arranged between the first fiber layer 11 and the second fiber layer 12 and, if necessary, between the first fiber layer 11 and the third fiber layer 13 as long as the effects of the present invention are exhibited. fiber layer. In the case where other fiber layers are also arranged, the boundary surfaces between the fiber layers 11 and 12 and the other fiber layers and the boundary surfaces between the fiber layers 11 and 13 and the other fiber layers are independent of each other, which may be obvious or may be is not obvious. In addition, the first fiber layer 11 and other fiber layers may be configured to be non-peelable, and the other fiber layers and the second fiber layer 12 may be configured to be peelable, or the first fiber layer 11 and other fiber layers may be configured to be peelable. In addition, the other fiber layers and the second fiber layer 12 are configured to be non-peelable, or the fiber layers 11 and 12 and the other fiber layers may be configured to be peelable or non-peelable, respectively. Similarly, the first fiber layer 11 and other fiber layers may be configured to be non-peelable, and the other fiber layers and the third fiber layer 13 may be configured to be peelable, or the first fiber layer 11 and other fiber layers may be configured to be peelable. In addition, the other fiber layers and the third fiber layer 13 are configured to be non-peelable, or the fiber layers 11 and 13 and the other fiber layers may be configured to be peelable or non-peelable, respectively. As the other fiber layer, for example, a nonwoven fabric containing the above-mentioned synthetic fibers can be used.

When all the fiber layers of the mask sheet 10 can be peeled off, the contamination of foreign matter between the fiber layers can be easily confirmed, which is preferable from the viewpoint of improving the quality of the mask sheet. As shown in the above-mentioned embodiment, in the form in which the first fiber layer 11 and the second fiber layer 12 are adjacent to each other, the first fiber layer 11 and the second fiber layer 12 are preferably configured to be releasable. Moreover, when the 3rd fiber layer 13 and the 1st fiber layer 11 are arrange|positioned adjacently, it is preferable that the 1st fiber layer 11 and the 3rd fiber layer 13 are comprised so that peeling is possible.

The above-mentioned sheet 10 for masks has been described as an example of the embodiment in a single-piece state, but the sheet 10 for masks can be wound up, for example, to be a wound body. Specifically, the mask sheet 10 of the present embodiment is configured as an elongated continuous body, and the mask sheet can be wound in the longitudinal direction to form a wound body.

When the mask sheet is in the form of a wound body, it is preferable that the mask sheet 10 is arranged at predetermined intervals in the longitudinal direction, and has perforation lines (formed in a linear shape) formed in a direction intersecting the longitudinal direction. multiple eyelets). By adopting such a structure, the mask sheet 10 can be cut every time the mask sheet 10 is to be used, and the mask sheet can be used as a single piece, so that the clean feeling can be ensured, and the use of the mask sheet 10 and the mask having the mask sheet 10 feeling further improved. In particular, this form is advantageous when using the mask sheet 10 as a filter.

Hereinafter, the manufacturing method of the sheet|seat 10 for masks is demonstrated. Taking the form of the two-layer structure shown in FIG. 5 as an example, the description will be made with reference to the manufacturing apparatus 100 shown in FIG. 7 . Preferably, the manufacturing apparatus 100 suitable for manufacturing the mask sheet 10 includes the original roll 110 , the spinning nozzle 120 , the junction forming part 130 , and the perforation line forming part 140 .

First, the fiber sheet raw material which comprises the 2nd fiber layer 12 is sent out from the original roll 110, and it is conveyed in the conveyance direction MD. As the raw material sent out from the original roll 110, for example, a raw material of a nonwoven fabric such as a spunbonded nonwoven fabric can be used.

Next, the first fiber layer 11 is laminated on the raw material of the second fiber layer 12 conveyed in the conveyance direction MD. In the present embodiment, the fibers constituting the first fiber layer 11 are directly and continuously spun from the spinning nozzles 120 arranged in the width direction CD perpendicular to the conveyance direction MD until they are conveyed in the conveyance direction MD. The upper surface of the raw material of the second fiber layer 12 (hereinafter, this production method is also referred to as the first production method.). Therefore, it is preferable to deposit the constituent fibers of the first fiber layer 11 on the upper surface of the raw material of the second fiber layer 12 over the entire upper surface of the raw material of the second fiber layer 12 to form the laminate 1S. This laminated body 1S is comprised in the belt shape extended in the conveyance direction MD, and the 1st fiber layer 11 and the 2nd fiber layer 12 are adjacent to each other.

As the spinning nozzle 120, for example, a device used for a melt blowing method or an electrospinning method can be used. From the viewpoint of efficiently forming fibers having a relatively small diameter, it is preferable to use an apparatus for electrospinning. An apparatus used for electrospinning typically includes: a conductive nozzle for releasing a raw material solution containing a resin; a conductive electrode disposed opposite to the nozzle and generating an electric field between the nozzle and the electrical field; and a voltage The generating unit is a power source for applying a voltage between the nozzle and the electrode, and this device can release the raw material liquid from the nozzle to the object in the electric field.

In the formation of the laminated body 1S, instead of spinning the constituent fibers of the first fiber layer 11 by the spinning nozzle 120, for example, the spinning nozzle 120 may not be provided, and the first fiber layer 11 and the second fiber layer may be The nonwoven fabric material of the laminated two-layer structure is produced in advance as the original roll 110 , and the nonwoven fabric material is fed out from the original roll 110 and conveyed in the conveyance direction MD. In addition, the original roll of the first fiber layer 11 and the original roll of the second fiber layer 12 may be used independently, the raw material may be fed from each original roll, and the first fiber layer (hereinafter, also referred to as the first fiber layer) may be laminated on the upper surface of the second fiber layer 12. This production method is referred to as the second production method.).

In addition, in the case of forming the mask sheet 10 of the three-layer structure shown in FIG. 6 , after laminating the first fiber layer 11 on the raw material of the second fiber layer 12, for example, the fiber sheet constituting the third fiber layer 13 is laminated. The raw material is fed out from the second original roll (not shown) and conveyed in the conveying direction MD, and the third fiber layer 13 is laminated on the upper surface of the first fiber layer 11 to form a three-layer structure laminate 1S. In this case, the original roll 110 and the second original roll are separated. The laminated body 1S of this form is a belt-shaped laminated body extending in the conveyance direction MD, the third fiber layer 13 and the second fiber layer 12 are arranged with the first fiber layer 11 interposed therebetween, and the first fiber layer 11 and the third fiber layer 13 , the first fiber layer 11 and the second fiber layer 12 are adjacent to each other. As the raw material discharged from the second original roll, for example, a raw material of a nonwoven fabric such as a spunbonded nonwoven fabric can be used.

As another method of forming the mask sheet 10 of the three-layer structure shown in FIG. 6, the following methods can be mentioned. First, fibers are spun by a predetermined method to form the second fiber layer 12 . Next, on the second fiber layer 12 , the fibers are spun so that the average fiber diameter is smaller than that of the constituent fibers of the second fiber layer 12 to form the first fiber layer 11 . The constituent fibers of the first fiber layer 11 are preferably spun so as to be 0.2 μm or more and 2 μm or less. Then, on the first fiber layer 11, the fibers are spun so that the average fiber diameter is larger than that of the constituent fibers of the first fiber layer 11 to form the third fiber layer 13, and the laminated body 1S of the three-layer structure is obtained (hereinafter, referred to as This production method is also referred to as the third production method.).

Then, the laminated body 1S is passed through an embossing roll or a joining portion forming portion 130 described later to integrate the respective fiber layers. That is, the sheet obtained by the present production method has the same form as the so-called spunbond-meltblown-spunbond (SMS) nonwoven fabric, and the meltblown layer in the SMS nonwoven fabric corresponds to the first fiber layer 11. The number of layers of the first fiber layer 11 at this time can be appropriately changed according to the intended mask sheet, and, for example, the same structure as SMMS nonwoven fabric and SMMMS nonwoven fabric can be adopted.

In the above-mentioned first to third production methods, the first fiber layer has high adhesion to other fiber layers, and from the viewpoint of easily obtaining a sheet with a strong sense of unity as a whole sheet, it is preferable to use the second production method. Method 1 or Method 3. That is, as a preferable manufacturing method, it is preferable to employ|adopt in the order of 2nd manufacturing method <1st manufacturing method or 3rd manufacturing method.

Next, the laminated body 1S is introduced into the junction part forming part 130 to form the junction part B for joining the first fiber layer 11 and the second fiber layer 12, and the fiber layers are integrated. The junctions B in the present embodiment are formed in a scattered shape. For the bonding portion forming portion 130, for example, an ultrasonic embossing device, a thermal embossing device, or the like can be used. The bonding portion B may be formed over the entire area of the laminate 1S in plan view, or may be formed only at the portion to be formed in the mouth-corresponding area A instead of this. In the case of the laminated body 1S having a three-layer structure, the joining portion B may join at least the first fiber layer 11 and the second fiber layer 12, and may join the third fiber layer 13 in addition to the respective fiber layers 11 and 12. , the fiber layers can be integrated. In the case of the laminated body 1S having a three-layer structure, the fiber layers 11 , 12 , and 13 are stacked together and introduced into the joint portion forming portion 130 to simultaneously integrate the respective fiber layers, so that the number of joint portions B can be reduced. The number of formed objects is preferable in order to ensure moderate air permeability and to improve sheet strength.

When the junctions B are formed in a scattered point shape, the intervals along the conveyance direction MD of the junctions B are independent of each other, preferably 1 mm or more, more preferably 3 mm or more, and preferably 20 mm or less, more preferably 10 mm or less .

The intervals along the width direction CD of the bonding portions B are independent of each other, preferably 1 mm or more, more preferably 3 mm or more, and preferably 20 mm or less, more preferably 10 mm or less. Each interval between the joints B is measured from the distance between the centers of gravity of the joints B to be measured.

Since the laminated body 1S in which the junction part B was formed is an elongated sheet, it can be made into the elongated sheet|seat 10 for masks. By winding this long sheet 10 for masks, it can be stored or distributed as a wound body in which the sheet 10 is wound. This wound body is, for example, a blank roll of the mask sheet 10 .

Moreover, the sheet|seat 10 for masks of the form of a single piece can be obtained by carrying out processing, such as cutting, so that the elongated sheet|seat 10 for masks may become predetermined size. The mask sheet 10 can preferably be used as a filter sheet. The sheet 10 for masks in the form of a single sheet can also be stored or distributed in the market in the form of a package that is housed in a packaging bag in a state where a plurality of these are stacked.

As another processing method of the long sheet 10 for masks, for the long sheet 10 for masks, hooks are attached to both ends in the width direction CD of the sheet 10 at predetermined intervals along the conveying direction MD And the sheet|seat 10 can be formed as the sheet|seat 10 for masks which has a hook part by cutting|disconnecting the sheet|seat 10 in the width direction between the hook parts along the conveyance direction MD. Also can replace this mode, be cut into a single piece in the mode that the strip 10 for masks becomes a predetermined size, then the hanging ear portion is installed on the peripheral portion, thus can obtain the mask with the single piece of the hanging ear portion Use tablet 10. It is preferable that the above-mentioned sheet 10 for masks can be used as the mask body 5 itself, and can be used as the mask 1 as it is.

As another processing method of the long sheet 10 for masks, the sheet 10 for masks is introduced into the perforation line forming part 140, and the perforation line C composed of the row of discontinuous cut parts is formed. The perforation line C is formed in the direction intersecting with the longitudinal direction (that is, the conveyance direction MD) of the sheet 10 for masks, preferably in the width direction CD. The perforation line C extends in the direction intersecting with the longitudinal direction of the mask sheet 10, and is formed at predetermined intervals in the longitudinal direction of the laminated body 1S. The perforation line forming part 140 can be processed by using, for example, a device or the like that intermittently irradiates the sheet 10 for masks with a laser and cuts the sheet 10 in the thickness direction.

The lengths of the cut portions of the perforated lines C along the extending direction of the perforated lines C are independent of each other, preferably 1 mm or more, more preferably 3 mm or more, and preferably 20 mm or less, more preferably 10 mm or less. In addition, the interval between adjacent incisions in the extending direction of the perforation line C is independent of each other, preferably 1 mm or more, more preferably 3 mm or more, and preferably 20 mm or less, more preferably 10 mm or less.

When the perforation line C is formed in the long sheet 10 for masks, the sheet 10 for masks is not completely broken, so the sheet 10 for masks in which the perforation C is formed is in the form of a long strip. Then, the long sheet 10 for masks in which the perforation line C is formed is wound, and is stored or distributed as a wound body 10A formed by winding the sheet 10.

The winding body 10A of the elongated mask sheet 10 having the perforation line C formed thereon can be cut, for example, in the direction orthogonal to the axial direction of the winding body 10A, and can be the same diameter as the winding body 10A and the same diameter as the winding body 10A. The winding body 10A is the second winding body 10B (refer to FIG. 8 ) that is smaller in size in the width direction CD. Furthermore, as shown in FIG. 8, the mask sheet 10 in the 2nd wound body 10B can be wound into a roll shape, for example, can be individually divided into small rolls, and can be a third diameter smaller than that of the second wound body 10B. Wound body 10C.

10 C of 3rd winding bodies of such an embodiment are rolls of the long sheet|seat 10 for masks in which the perforation line C extended in the axial direction was formed. The third wound body 10C is smaller in size in the width direction CD than the wound body 10A, and smaller in diameter than the second wound body 10B.

As shown in Fig. 9 , the third wound body 10C can be stored or distributed in the market as a package body 80 that accommodates it in the packaging bag 50, for example. The packaging bag 50 shown in the figure is provided with an opening 51 for extracting the mask sheet 10 accommodated in the packaging bag 50 at any position thereof, and the mask sheet 10 can be extracted from the opening 51 . After pulling out the mask sheet 10 in the package body 80 from the opening 51, the mask sheet 10 is torn at a predetermined position, for example, at the position where the perforation line C is formed, and the long mask sheet 10 can be obtained. 3. The single-piece mask sheet 10 of the wound body 10C. It is preferable that this mask sheet 10 can be used as a filter sheet.

By adopting this method, a clean and unused sheet can be taken out every time it is used, and a single sheet having a predetermined size can be easily obtained. Moreover, the sheet|seat 10 for masks of several single sheets can be obtained more easily from one winding body. As a result, the usability as a filter and the convenience at the time of use are further improved.

Through the above steps, the mask sheet 10 of each embodiment can be obtained. In addition, it is clear from the above description that the present invention not only provides a mask sheet and a mask, but also provides a method of using the mask sheet. As this usage method, the mask sheet can be used as a filter which is detachable from the mask body in the mask. Instead of this method, the mask sheet may be used as the mask body.

As mentioned above, although this invention was demonstrated based on preferable embodiment, this invention is not limited to the said embodiment.

[Example]

Hereinafter, the present invention will be described in more detail using examples. However, the scope of the present invention is not limited to this embodiment.

[Example 1]

As the sheet 10 for masks, a sheet having a three-layer structure as shown in FIG. 6 was obtained. First, as the second fiber layer 12, the raw material of the spunbond nonwoven fabric made of PP resin is conveyed in the conveying direction MD, and the entire upper surface area thereof is directed toward the 16 spinning nozzles 120, thereby performing electrospinning. The first fiber layer 11 is formed on the upper surface of the second fiber layer 12 . The spinning conditions of the constituent fibers of the first fiber layer 11 are as follows. Next, as the third fiber layer 13 , a raw material of a spunbonded nonwoven fabric made of PP resin was laminated on the upper surface of the first fiber layer 11 to obtain a laminated body 1S having a three-layer structure. The bonding portion B is not formed in each of the fiber layers 11 , 12 , and 13 in the laminated body 1S.

This laminated body 1S is introduced into the joint part forming part 130 and subjected to ultrasonic embossing to form the sporadic joint parts B where the respective fiber layers 11, 12 and 13 are joined, and the elongated mask sheet 10 is obtained. The joint portion B has a shape of a perfect circle in plan view with a diameter of 1 mm, and the average area of each joint portion B is 0.785 mm ² . The space|interval along the conveyance direction MD of the junction part B was 5.1 mm, and the space|interval of the width direction CD of the junction part B was 3.42 mm. The number of the junctions B formed in the range of 20 mm×20 mm in the mouth-corresponding region A was 15 pieces.

Then, the long sheet 10 for masks was cut so that the length along the conveyance direction MD was 150 mm, and the length along the width direction CD was 100 mm, to obtain the single-piece mask sheet 10 of the present example.

<Spinning conditions>

·Spinning environment: 25℃, 50%RH

Raw material solution for electrospinning: 95% by mass of PP (manufactured by PolyMirae, MF650Y, melting point 155°C), and 5% by mass of acyl alkyl taurate (N-stearoyl-N- Sodium methyl taurine; Nikko Chemicals Co., Ltd. product, NIKKOL SMT) heating melt of the resin composition.

·Applied voltage to spinning nozzle: -10kV

The shortest distance between spinning nozzle and fiber layer: 300mm

·Nozzle diameter: 0.25mm

[Examples 2 to 6]

The transport speed and applied voltage of the second fiber layer 12 during electrospinning were adjusted, and the first fiber layer 11 having the basic weight and average fiber diameter shown in Table 1 was produced on the upper surface of the second fiber layer 12. Otherwise, it carried out similarly to Example 1, and obtained the single-piece mask sheet 10 of the three-layer structure.

[Examples 7 to 9]

The transport speed and applied voltage of the second fiber layer 12 during electrospinning were adjusted, and the first fiber layer 11 having the basic weight and average fiber diameter shown in Table 1 was produced on the upper surface of the second fiber layer 12. Otherwise, it carried out similarly to Example 1, and obtained the single-piece mask sheet 10 of the three-layer structure.

[Comparative Example 1]

A single sheet with a three-layer structure was obtained in the same manner as in Example 1, except that the first, second, and third fiber layers were changed to have the basic weights shown in Table 1, respectively, and that the bonding portion B was not formed. Sheet 10 for masks.

[Evaluation of thickness and ventilation resistance]

The thickness T1 of the mask sheet of the Example and the ventilation resistance of the mask sheet of the Example and the comparative example were measured according to the above-mentioned method. The results are shown in Table 1.

[Evaluation of the collection rate of fine particles]

The collection rate of the fine particles of the mask sheets of Examples and Comparative Examples was measured by the following method.

A gaseous particle counter (MET ONE HHPC6+, manufactured by BECKMAN COULTER Co., Ltd.) was held in hand, and the sheet was fixed so that the measurement terminal of the counter was sealed with the sheet for mask to be evaluated. Then, the number P1 of particles passing in the sheet thickness direction was measured using fine particles (particle diameter of 1.0 µm or more) in the air at 25°C and 50% RH as objects. In addition, in the state in which the sheet|seat was not arrange|positioned, the particle number P2 was measured. From the measured particle numbers P1 and P2, the fine particle collection rate (%) was calculated based on the following formula. The higher the fine particle collection rate, the higher the fine particle collection performance of the mask sheet. The results are shown in Table 1.

Fine particle capture rate (%) = 100×(P2-P1)/P1

[Evaluation of usability]

The following items (1) and (2) were evaluated for the feeling of use of the mask sheets of the examples and comparative examples by the following methods. The results are shown in Table 1. In addition, in the mask sheet used for the evaluation of the feeling of use, the ear part is provided in the area other than the area corresponding to the mouth of the mask sheet with a rubber band or the like, and a simple mask shape is formed. The evaluation members were made to wear the mask for evaluation.

(1) Ease of breathing

A total of five evaluation members, men and women in their 20s to 30s, were put on the mask sheet, and the ease of breathing was evaluated according to the following criteria. The evaluation is the value of the points of the most selected evaluations.

3 points: It can breathe naturally when wearing it, and the feeling of use is excellent.

2 o'clock: I felt some breathing difficulties when wearing it, but there was no problem in using it.

1 point: It is generally possible to breathe when wearing it, but it is difficult to wear it for a long time, and the feeling of use is poor.

(2) Wearing feeling

A total of five evaluation members, men and women in their 20s to 30s, were put on the mask sheet, and the feeling of wearing the sheet was evaluated according to the following criteria. The evaluation is the value of the points of the most selected evaluations.

3 points: The mask sheet can be worn without feeling the hardness and thickness of the mask sheet when grasping or wearing, and the feeling of use is excellent.

2 points: The hardness and thickness of the mask sheet were slightly felt when grasped or worn, but there was no problem with the feeling of use.

1 point: It is easy to feel the hardness and thickness of the mask sheet when grasping or wearing it, and it will feel uncomfortable when worn for a long time, and the feeling of use is poor.

[Table 1]

As shown in Table 1, the mask sheet 10 of the present Example was excellent in the trapping performance of particulate foreign matter, was thin, and had good air permeability, and accordingly, the feeling of use was also high.

In particular, the masks for masks of Examples 1 and 2, and more preferably, the mask for masks of Example 2, were evaluated for both a high collection rate of particulate foreign matter, a reduction in ventilation resistance, and a high sense of use.

Description of reference numerals

1 mask

5 The main body of the mask

10 Sheets for masks

10A, 10B, 10C winding body

11 The first fiber layer

12 2nd fiber layer

13 3rd fiber layer

50 bags

80 pack

100 Manufacturing Units

A Corresponding area of mouth

B joint

C perforated line.

Claims (13)

1. a mask sheet is characterized in that: including a first fiber layer and a second fiber layer provided on one side of the first fiber layer, The average fiber diameter of the fibers constituting the second fiber layer is larger than the average fiber diameter of the fibers constituting the first fiber layer, The fibers constituting the first fiber layer have an average fiber diameter of 0.2 μm or more and 2 μm or less, The basic weight of the first fiber layer is 2 g/m ² or more and 20 g/m ² or less, The ratio of the basic weight of the second fiber layer to the basic weight of the first fiber layer is greater than 0 and less than 8. 2. mask sheet as claimed in claim 1, is characterized in that: The ventilation resistance is 0.5 kPa·s/m or less. 3. a mask sheet is characterized in that: including a first fiber layer and a second fiber layer provided on one side of the first fiber layer, The average fiber diameter of the fibers constituting the second fiber layer is larger than the average fiber diameter of the fibers constituting the first fiber layer, The fibers constituting the first fiber layer have an average fiber diameter of 0.2 μm or more and 2 μm or less, It has a mouth-corresponding region arranged to correspond to the position of the mouth of the user in plan view, In a plan view, in a range of 20 mm×20 mm in the mouth corresponding region, the mouth corresponding region has one or more joint portions for joining the first fiber layer and the second fiber layer, In a plan view, the total area of the joints exceeds 0% of the area of the mouth-corresponding region and is less than or equal to 2% of the mouth-corresponding region. 4. mask sheet as claimed in claim 3 is characterized in that: The joint portion is formed by thermal fusion. 5. mask sheet as claimed in claim 3 is characterized in that: The average area of each of the joint portions is 0.1 mm ² or more and 3 mm ² or less. 6. mask sheet as claimed in claim 1 or 3, is characterized in that: The basic weight of the second fiber layer is 5 g/m ² or more and 30 g/m ² or less. 7. mask sheet as claimed in claim 1 or 3, is characterized in that: The second fiber layer is a non-woven fabric. 8. mask sheet as claimed in claim 1 or 3, is characterized in that: On the surface side of the first fiber layer on which the second fiber layer is not disposed, a third fiber layer is further provided, The average fiber diameter of the fibers constituting the third fiber layer is larger than the average fiber diameter of the fibers constituting the first fiber layer. 9. mask sheet as claimed in claim 1 or 3, is characterized in that: On the surface side of the first fiber layer on which the second fiber layer is not disposed, a third fiber layer is further provided, The outer surface of the second fiber layer or the outer surface of the third fiber layer is a surface facing the user's mouth. 10. A winding body, characterized in that: be wound with the mask sheet described in claim 1 or 3, The mask sheet is in the shape of a long strip. 11. The winding body of claim 10, wherein: There are perforation lines in the direction crossing the length direction. 12. A mask, characterized in that: Have the mask sheet described in claim 1 or 3 as the mask main body. 13. A mask, characterized in that: Including a mask body and a removable filter relative to the mask body, The filter sheet is the mask sheet according to claim 1 or 3.

Images