Sanitary mask sheet
A sanitary mask sheet, in which a WC value indicating a work volume up to a maximum pressure in a thickness direction is 0.3 Pa·m or more, and a capture rate of particles having a particle diameter of more than 1 μm is 85% or more.
1 . A sanitary mask sheet assembly, comprising: a plurality of sheets, wherein the plurality of sheets include: a planar-shaped base sheet, and a projecting-and-depressed sheet with a first surface and a second surface opposite the first surface and having a plurality of projections projecting outward in a thickness direction and depress ions between the plurality of projections at least on the first surface in a natural state of the sanitary mask sheet assembly, wherein the projecting-and-depressed sheet includes: a fine fiber layer having an average fiber diameter of 3000 nm or less and a density of 0.05 g/cm 3 or more, and a protection sheet for the fine fiber layer, a density of the protection sheet being lower than the density of the fine fiber layer, wherein the protection sheet has a strength to protect the fine fiber layer, wherein the protection sheet has a shape laid along a first surface of the fine fiber layer, wherein the planar-shaped base sheet is laminated on the second surface of the projecting-and-depressed sheet, wherein the projecting-and-depressed sheet is joined with the planar-shaped base sheet at the depressions, wherein the protection sheet directly contacts the planar-shaped base sheet, wherein a capture rate of particles for the protection sheet is lower than a capture rate of particles for the fine fiber layer and wherein the fine fiber layer directly contacts the planar-shaped base sheet.
2 . The sanitary mask sheet assembly according to claim 1 , wherein
the capture rates for the protection sheet and for the fine fiber layer is for particles having particle diameter of more than 1 μm.
3 . The sanitary mask sheet assembly according to claim 2 , wherein the capture rate for the protection sheet is 60% or less than the capture rate for the fine fiber layer.
4 . The sanitary mask sheet assembly according to claim 1 , wherein the average fiber diameter of the fine fiber layer is 1000 nm or less.
5 . The sanitary mask sheet assembly according to claim 1 , wherein the density of the fine fiber layer is more than 0.2 g/cm 3 .
6 . The sanitary mask sheet assembly according to claim 1 , wherein
the average fiber diameter of the fine fiber layer is thinnest among the plurality of sheets of the sanitary mask sheet assembly.
7 . The sanitary mask sheet assembly according to claim 1 , wherein
the protection sheet is a non-woven fabric.
8 . The sanitary mask sheet assembly according to claim 1 , wherein an inside of each of the plurality of projections is hollow.
9 . The sanitary mask sheet assembly according to claim 1 , wherein the planar-shaped base sheet is a non-woven fabric and has higher strength than the fine fiber layer.
10 . The sanitary mask sheet assembly according to claim 1 ,
wherein the projecting-and-depressed sheet is joined with the planar-shaped base sheet by fusion bonding, and
a plurality of joint points between the projecting-and-depressed sheet and the planar-shaped base sheet are intermittently formed along a direction in which the depression extends and form a joint point line.
11 . The sanitary mask sheet assembly according to claim 1 , wherein a ratio of an average fiber diameter of the protection sheet to the average fiber diameter of the fine fiber layer is 5 or more.
12 . The sanitary mask sheet assembly according to claim 1 , wherein
the first surface of the projecting-and-depressed sheet is a skin contact surface, and
a bending resistance of the protection sheet is 20 mm or more.
13 . The sanitary mask sheet assembly according to claim 1 , wherein the plurality of projections and the depressions extend in a width direction of the sanitary mask sheet assembly from a first edge of the projecting-and-depressed sheet to a second edge of the projecting-and-depressed sheet opposite the first edge of the projecting-and-depressed sheet.
14 . The sanitary mask sheet assembly according to claim 1 , wherein
an air flow resistance of the projecting-and-depressed sheet is greater than 0 kPa·s/m and 0.5 kPa·s/m or less.
15 . The sanitary mask sheet assembly according to claim 1 , wherein a height of the plurality of projections is 1 mm or more and 4 mm or less.
16 . A sanitary mask comprising: a sanitary mask sheet assembly, including a plurality of sheets, the plurality of sheets including: a planar-shaped base sheet, and a projecting-and-depressed sheet with a first surface and a second surface opposite the first surface and having a plurality of projections projecting outward in a thickness direction and depressions between the plurality of projections at least on the first surface in a natural state of the sanitary mask sheet assembly, wherein the projecting-and-depressed sheet includes: a fine fiber layer having an average fiber diameter of 3000 nm or less and a density of 0.05 g/cm 3 or more, and a protection sheet for the fine fiber layer, a density of the protection sheet being lower than the density of the fine fiber layer, wherein the protection sheet has a strength to protect the fine fiber layer, wherein the protection sheet has a shape laid along a first surface of the fine fiber layer, wherein the projecting-and-depressed sheet is joined with the planar-shaped base sheet at the depressions, wherein the protection sheet directly contacts the planar-shaped base sheet, wherein a capture rate of particles having particle diameter of more than 1 μm for the protection sheet is lower than a capture rate of particles having particle diameter of more than 1 μm for the fine fiber layer, and wherein the fine fiber layer directly contacts the planar-shaped base sheet.
17 . The sanitary mask according to claim 16 , wherein the protection sheet is a non-woven fabric.
18 . The sanitary mask according to claim 17 , wherein the projecting-and-depressed sheet is joined with the planar-shaped base sheet at the depressions; an inside of each of the plurality of projections is hollow, and the planar-shaped base sheet is a non-woven fabric.
19 . The sanitary mask according to claim 16 , wherein
the first surface of the projecting-and-depressed sheet is a skin contact surface.