CN115968417A

CN115968417A - Skin care sheet

Info

Publication number: CN115968417A
Application number: CN202180052438.2A
Authority: CN
Inventors: 森浩喜; 山川美帆
Original assignee: Unicharm Corp
Current assignee: Unicharm Corp
Priority date: 2020-08-25
Filing date: 2021-08-13
Publication date: 2023-04-14
Also published as: WO2022044849A1; JP7361001B2; JP2022037796A

Abstract

A skin care sheet having concave and convex portions is improved in wiping performance of foreign matter on the skin surface. The skin care sheet (1) has a nonwoven fabric layer (10) disposed on the surface thereof, and has a first Direction (DA) and a second Direction (DB) which are orthogonal to each other in a plan view. The nonwoven fabric layer (10) is formed with convex portions (11) and concave portions (12) that are recessed on the back surface side of the convex portions. The recess (12) has a wave-shaped column section (13) extending in a first Direction (DA) in a plan view. The plurality of column sections are arranged at intervals in the second Direction (DB).

Description

Skin care sheet

Technical Field

The present invention relates to a skin care sheet used in contact with the skin.

Background

Patent document 1 discloses a skin care sheet used in contact with the skin. The skin care sheet of patent document 1 is configured to easily maintain the form of the sheet itself by performing a treatment such as embossing. Convex portions and concave portions are formed on a sheet subjected to embossing or the like, and the mode of movement of foreign matter on the skin surface is different from that of a flat sheet in which the convex portions and concave portions are not formed. More specifically, when the flat sheet is moved while being brought into contact with the skin, foreign matter (dirt, dust) wiped by the sheet remains directly on the sheet, and there is a possibility that the sheet cannot wipe the foreign matter. However, in the sheet in which the convex portions and the concave portions are formed, foreign matter abutting against the convex portions is guided to the concave portions, so that the foreign matter is easily wiped.

Prior art documents

Patent document

Patent document 1: japanese patent laid-open No. 2006-288604

Disclosure of Invention

However, depending on the arrangement of the concave portions and the convex portions, there is a possibility that the foreign matter cannot be sufficiently wiped, or the foreign matter once guided to the concave portions moves to the skin side again. For example, in a mode in which a plurality of convex portions and concave portions are formed at intervals over the entire sheet, when the sheet is moved while being brought into contact with the skin, foreign matter on the surface of the skin in contact with the convex portions can be temporarily guided to the concave portions. However, in a structure in which a sufficient accommodation space for the recessed portion cannot be secured and a structure in which foreign matter is easily moved from the recessed portion to the protruding portion, there is a possibility that the foreign matter once guided to the recessed portion is moved again to the skin side. That is, there is room for improvement regarding the shapes of the concave and convex portions.

The present invention has been made in view of the above problems, and an object of the present invention is to improve the wiping performance of foreign matter on the skin surface in a skin care sheet having concave portions and convex portions.

The skin care sheet of one embodiment has a nonwoven fabric layer disposed on a surface thereof, and has a first direction and a second direction orthogonal to each other in a plan view. The nonwoven fabric layer is formed with a convex portion and a concave portion depressed toward the back side from the convex portion. The concave portion has a wave-shaped row portion extending in the first direction in a plan view. The plurality of column portions are arranged at intervals in the second direction.

Drawings

Fig. 1 is a plan view of the skin care sheet according to the embodiment as viewed from the front surface side.

Fig. 2 is a partially enlarged view of the skin care sheet shown in fig. 1.

Fig. 3 is an enlarged view of the X portion shown in fig. 2.

Fig. 4 isbase:Sub>A schematic sectional view taken along linebase:Sub>A-base:Sub>A shown in fig. 3.

Detailed Description

(1) Brief description of the embodiments

At least the following matters will be made clear from the description of the present specification and the drawings.

The skin care sheet of one embodiment has a nonwoven fabric layer disposed on a surface thereof, and has a first direction and a second direction orthogonal to each other in a plan view. The nonwoven fabric layer is provided with a convex portion and a concave portion recessed toward the back surface side from the convex portion. The concave portion has a wave-shaped row portion extending in the first direction in a plan view. The plurality of column portions are arranged at intervals in the second direction. When the skin care sheet is moved while being brought into contact with the skin, foreign matter (dirt, dust) on the skin surface of the contact convex portion can be guided to the concave portion. In this case, since the recessed portions extend in a wave shape, it is possible to spread foreign matter in the recessed portions, and to easily and continuously introduce foreign matter into the recessed portions, and to suppress the foreign matter from moving to the convex portions again, as compared with the recessed portions which are intermittently arranged in a dot shape or the like. In the case where the concave portions are arranged linearly, if the sheet is moved along the concave portions, foreign matter moves along the concave portions and the convex portions, and it is difficult to introduce the foreign matter from the convex portions to the concave portions. However, since the concave portions are arranged in a wave shape, for example, even when the sheet is moved in the first direction or the sheet is moved in the second direction, the convex portions and the concave portions alternately come into contact with each other, and foreign matter can be introduced from the convex portions to the concave portions. In addition, in the sheet having the concave portions and the convex portions, the basis weights and densities of the fibers of the concave portions and the convex portions are different from each other, and therefore, the rigidity of the concave portions and the rigidity of the convex portions may be different from each other. Even in the case of the mode in which the rigidity of the concave portion and the rigidity of the convex portion are different from each other, the force can be dispersed as compared with the sheet having the point-like or linear concave portion, and it is difficult to form a bending base point due to the difference in force, and the twist of the sheet can be suppressed.

According to a preferred aspect, the convex portion is formed by a region sandwiched by the wave-shaped column portions. The convex portions are not dot-shaped regions but regions of the surface sandwiched by the wavy column portions. According to this aspect, the contact pressure to the skin can be reduced and the skin feel can be improved by reducing the ground contact area as compared with a sheet in which the concave portions and the convex portions are not formed. In addition, in the sheet in which the dotted convex portions are formed, since the area of the convex portions is extremely small, the contact pressure with the skin may be increased. However, by reducing the ground contact area as compared with a sheet having dot-shaped projections, the contact pressure against the skin can be reduced, and the skin feel can be improved.

According to a preferred aspect, the column portion is continuous in the first direction. According to this aspect, the row portion continues in the first direction, and when wiping is performed along the second direction, the foreign matter is surely brought into contact with the concave portion, and the foreign matter is drawn into the concave portion, and wiping is performed with the foreign matter remaining on the convex portion, whereby a problem that the foreign matter spreads over the convex portion can be suppressed.

According to a preferred aspect, the wave shape of the column portion is configured by a first portion extending to one side in the first direction and extending to one side in the second direction, a second portion extending to one side in the first direction and extending to the other side in the second direction, and a third portion connecting the first portion and the second portion. The third portion is curved. According to this aspect, since the first portion and the second portion extend in the second direction in different directions from each other, the foreign matter introduced into the recess can be guided in various directions. Further, since the first portion and the second portion extend in the direction opposite to the second direction, the force applied to the recess can be dispersed, and local concentration of force can be suppressed. Further, since the third portion connecting the first portion and the second portion is curved, a corner portion where straight lines intersect with each other is not formed, and retention of foreign matter in the third portion can be suppressed.

According to a preferred aspect, the column portion has a first column portion and a second column portion adjacent to the first column portion in the second direction. The phase of the wave shape of the first row portion is shifted from the phase of the wave shape of the second row portion. In a mode in which the phase of the wave shape of the first column portion and the phase of the wave shape of the second column portion are matched and the first column portion and the second column portion are provided in parallel, the length of the region sandwiched by the first column portion and the second column portion in the second direction is uniform. However, in the aspect in which the phase of the wave shape of the first column portion and the phase of the wave shape of the second column portion are different from each other, the length of the region sandwiched between the first column portion and the second column portion in the second direction is not uniform. When wiping is performed in the direction of the waveform, dirt is easily guided into the concave portion without spreading because there are narrow regions between the column portions and wide regions between the column portions.

According to a preferred aspect, the distance between the first row portion and the second row portion in the second direction is shortest in a portion where the third portion of the first row portion and the third portion of the second row portion face each other. According to this aspect, since the interval between the first row portion and the second row portion in the second direction changes, the foreign matter on the convex portion can be guided gradually to the portion where the region between the convex portions is narrow while being drawn into the concave portion, and finally to the region where the interval is narrowest (the portion where the third portions face each other), and the foreign matter can be drawn into the concave portion adjacent to this region.

According to a preferred aspect, the shortest distance between the first row portion and the second row portion in the second direction is equal to or greater than the width of the recess and equal to or less than 1/2 of the length of each row portion in the second direction. If the shortest distance is shorter than the width of the concave portion, the convex portion constituting the distance is likely to fall down due to the concave portion disposed across the distance, and it may be difficult to maintain the shape of the convex portion. However, since the interval of the shortest portion is equal to or greater than the width of the concave portion, the shape of the convex portion is easily maintained. Further, since the interval of the shortest portion is 1/2 or less of the length of the column portion in the second direction, it is easy to obtain an effect of suppressing the region between the column portions from being too empty and collecting and guiding the foreign matter to the concave portion.

According to a preferred aspect, an angle formed by the first portion and the second portion arranged with the third portion interposed therebetween is an obtuse angle. According to this aspect, in comparison with a configuration in which the angle formed by the first portion and the second portion is an acute angle, the length extending in the first direction can be made longer than the length extending in the second direction in the concave portion. The foreign matter is easily guided to the direction in which the column portion extends, the diffusion of the foreign matter in the recess is promoted, and the foreign matter can be continuously introduced into the recess.

According to a preferred aspect, the basis weight of the fibers of the convex portion may be higher than the basis weight of the fibers of the concave portion. The convex portion protrudes more than the concave portion, and is likely to come into contact with skin and foreign matter. By increasing the basis weight of the projections, the pressing force of the hand during wiping becomes weak, and the hand is less likely to be directly transmitted to the skin, and the skin feel can be improved.

According to a preferred embodiment, the convex portion is formed with a fine concave portion having a depth shallower than the depth of the concave portion. According to this aspect, fine foreign matter can be introduced through the fine recessed portion. Further, the fine recessed portions can increase the surface area of the sheet during wiping, and the wiping properties can be further improved.

(2) Overall schematic structure of skin care sheet

Hereinafter, a skin care sheet according to an embodiment will be described with reference to the drawings. In the following description of the drawings, the same or similar reference numerals are given to the same or similar parts. However, the drawings are schematic, and it should be noted that the scale of each dimension and the like are different from those in reality. Therefore, specific dimensions and the like should be determined with reference to the following description. In addition, the drawings may include portions having different dimensional relationships and ratios from each other.

Fig. 1 is a plan view of a skin care sheet 1 according to an embodiment as viewed from the front surface side. Fig. 2 is a partially enlarged view of the skin care sheet 1 shown in fig. 1. Fig. 3 is an enlarged view of the X portion of the skin care sheet 1 shown in fig. 2. Fig. 4 isbase:Sub>A schematic sectional view taken along linebase:Sub>A-base:Sub>A shown in fig. 3. The skin care sheet 1 is used in contact with the skin of the user, and may be a facial sheet or a body sheet. The skin care sheet 1 may be a dry sheet or a wet sheet. The wet sheet of the present embodiment is a wiping sheet for wiping the vicinity of the excretory opening of an infant. The skin care sheet 1 has a first direction DA and a second direction DB extending in a planar direction and orthogonal to each other. The first direction DA may be a direction in which a column portion described later extends. In the rectangular skin care sheet 1, one of the first direction DA and the second direction DB may be a longitudinal direction and the other of the first direction DA and the second direction DB may be a width direction. In the square skin care sheet 1, the length in the first direction DA and the length in the second direction DB may be the same. The first direction DA extends toward one side DA1 and another side DA2 toward a side opposite to the one side DA 1. The second direction DB extends toward one side DB1 and the other side DB2 toward the side opposite to the one side DB 1.

The skin care sheet 1 has a nonwoven fabric layer 10. The skin care sheet 1 may be composed of only one nonwoven fabric layer 10, may have a plurality of nonwoven fabric layers 10, or may be a laminate of the nonwoven fabric layer 10 and another sheet. The skin care sheet 1 of the present embodiment is composed of one nonwoven fabric layer 10. The nonwoven layer 10 can have synthetic fibers (polyethylene terephthalate rayon) as well as natural fibers (rayon).

(3) Detailed structure of convex and concave parts

The nonwoven fabric layer 10 of the skin care sheet 1 of the present embodiment has the concave portions 12 and the convex portions 11 to improve the wiping performance of foreign matter on the skin surface. Next, the structure of the concave portion 12 and the convex portion 11 will be described in detail. At least one nonwoven fabric layer 10 is formed with projections 11 and depressions 12. The convex portions 11 and the concave portions 12 are disposed on the outer surface (front surface or back surface) of the skin care sheet 1. The convex portion 11 has the thickest portion of the nonwoven fabric layer 10. The convex portion 11 of the present embodiment is arranged in a planar shape. The region of the convex portion 11 may be a region other than the portion where the concave portion 12 is processed. The area of the convex portion 11 is larger than the area of the concave portion 12. The convex portion 11 has the thinnest part of the nonwoven fabric layer 10.

The concave portion 12 has a wave-shaped column portion 13 extending in the first direction DA in plan view. The column portion 13 may extend in at least the first direction DA, and may extend in the first direction DA while being inclined with respect to the first direction DA (extending in the second direction DB as well). The column portions 13 may be arranged at intervals in the second direction DB. The concave portion 12 may be constituted only by the column portion 13, or may have a portion other than the column portion 13. For example, the convex portion 11 may be formed with a fine concave portion (described later) 14 shallower than the concave portion 12. In the present embodiment, the structure extending in the first direction DA includes not only a structure parallel to the first direction DA but also a structure having an angle of 45 degrees or less with respect to the first direction DA. In addition, the structure extending in the second direction DB includes not only the structure parallel to the second direction DB but also the structure extending in the second direction DB by less than 45 degrees.

According to the skin care sheet 1 configured as described above, since the convex portions 11 and the concave portions 12 are provided on at least one of the front surface and the back surface of the skin care sheet 1, the convex portions 11 and the concave portions 12 come into contact with the skin of the user. When the skin care sheet 1 is moved while being brought into contact with the skin, foreign matter (dirt, dust) on the skin surface in contact with the convex portions 11 can be guided to the concave portions 12. At this time, since the concave portions 12 extend in a wave shape, it is possible to diffuse foreign matter in the concave portions 12, to easily draw foreign matter into the concave portions 12 continuously, and to suppress the foreign matter from moving again toward the convex portions 11, as compared with the concave portions 12 which are intermittently arranged in a dot shape or the like. In the case where the recesses 12 are arranged linearly, if the sheet 1 is moved parallel to the direction in which the recesses 12 extend, foreign matter moves along the recesses 12 and the protrusions 11, and it becomes difficult to introduce foreign matter from the protrusions 11 side to the recesses 12 side. However, since the recesses 12 are arranged in a wave shape, for example, even when the sheet 1 is moved in the first direction DA or the sheet 1 is moved in the second direction DB, the projections 11 and the recesses 12 alternately come into contact with each other, and foreign matter can be introduced from the projection 11 side to the recess 12 side. In the sheet 1 having the concave portions 12 and the convex portions 11, the basis weights and densities of the fibers in the concave portions 12 and the convex portions 11 are different from each other, and therefore the rigidity of the concave portions 12 and the rigidity of the convex portions 11 are sometimes different from each other. Even in the case of the mode in which the rigidity of the concave portion 12 and the rigidity of the convex portion 11 are different, the force can be dispersed as compared with the sheet having the point-like or linear concave portion 12, the bending base point due to the difference in force is less likely to be formed, and the torsion of the sheet can be suppressed.

Here, the column portions 13 may be arranged at intervals in the second direction DB so long as at least a part of adjacent column portions 13 is separated, and the adjacent column portions 13 may be partially connected. Preferably, the entire areas of adjacent column portions 13 may be separated from each other. For example, if the portion where the column portions 13 are connected is formed, the force may be concentrated on the connected portion. However, by separating the column portions 13 over the entire area, the area between the column portions 13 functions as an interference area, and the force propagating along the column portions 13 can be dispersed, and the sheet torsion caused by local concentration of the force can be suppressed.

The convex portion 11 may be constituted by a region sandwiched by the wave-shaped column portions 13. That is, the convex portion 11 may be formed by a region other than the column portion 13. The convex portions 11 in this embodiment are not dot-shaped regions but regions of surfaces sandwiched by the wave-shaped column portions 13. The convex portions 11 may be continuously provided in the first direction DA. According to this aspect, the contact pressure to the skin can be reduced and the skin feel can be improved by reducing the ground contact area as compared with a sheet in which the concave portions and the convex portions are not formed. In addition, in the sheet in which the dot-shaped convex portions are formed, since the area of the convex portions is extremely small, the contact pressure with the skin may be increased. However, by reducing the ground contact area as compared with a sheet having dot-shaped projections, the contact pressure to the skin can be reduced, and the skin feel can be improved.

The column portions 13 may be continuous between both edges of the nonwoven fabric layer 10 in the first direction DA, or may have partially discontinuous portions, as long as they have portions continuous in the first direction DA. In addition, the length of the discontinuous portion of the column portion 13 may be equal to or less than the width of the column portion. According to this structure, the columnar portions have discontinuous portions and easily function as continuous column portions in practice. In addition, the column portion 13 may be continuous in the first direction DA. Since the row portions 13 are continuous in the first direction DA, when wiping is performed along the second direction DB, foreign matter is surely brought into contact with the concave portion 12, and it is possible to suppress a problem that foreign matter spreads over the convex portion 11 due to the foreign matter being drawn into the concave portion 12 and wiped in a state where the foreign matter remains on the convex portion 11.

As shown in fig. 3, the wave shape of the column portion 13 may be configured by a first portion 31 extending to one side DA1 of the first direction DA and extending to one side DB1 of the second direction DB, a second portion 32 extending to one side DA1 of the first direction DA and extending to the other side DB2 of the second direction DB, and a third portion 33 connecting the first portion 31 and the second portion 32. The column portion 13 is arranged in the order of the first portion 31, the third portion 33, and the second portion 32 in the first direction DA. More specifically, the third portion 33 includes a third left portion 331 bulging to one side (left side in the main view) of the second direction DB, and a third right portion 332 bulging to the other side (right side in the main view) of the second direction DB. The third left portions 331 and the third right portions 332 are alternately arranged in the same column portion 13, and the column portion 13 has a waveform in which portions bulging toward one side DB1 of the second direction DB and portions bulging toward the other side DB2 of the second direction DB are alternately arranged. As shown in fig. 2, the first portion 31, the third left portion 331, the second portion 32, and the third right portion 332 are arranged in this order from one side DA1 to the other side DA2 in the first direction DA, and are repeatedly arranged in the first direction DA. Thereby, a regular wave shape is formed. The length of the second direction DB of the first part 31 may be the same as the length of the second direction DB of the second part 32. In addition, the length of the first direction DA of the first portion 31 may be the same as the length of the first direction DA of the second portion 32.

Since the first portion 31 and the second portion 32 extend in the opposite direction of the second direction DB, foreign substances introduced into the recess 12 can be guided in various directions. Further, since the first portion 31 and the second portion 32 extend in the direction opposite to the second direction DB, the force applied to the recess 12 can be dispersed, and local concentration of force can be suppressed. The third portion 33 may be linear with a corner. Preferably, the third portion 33 may be curved. Since the third portion 33 connecting the first portion 31 and the second portion 32 is curved, a corner portion where straight lines intersect with each other is not formed, and retention of foreign matter in the third portion 33 can be suppressed.

The column part 13 may have a first column part 21 and a second column part 22 adjacent to the first column part 21 in the second direction DB. In addition, the column part 13 may further have a third column part 23 adjacent to the first column part 21 in the second direction DB. The third row portion 23 is disposed on the opposite side of the second row portion 22 with respect to the first row portion 21. That is, the first row portion 21 is disposed between the second row portion 22 and the third row portion 23. The phase of the wave shape of the first column portion 21 and the phase of the wave shape of the second column portion 22 may be shifted and the phase of the wave shape of the first column portion 21 and the phase of the wave shape of the third column portion 23 may be shifted. The phase of the wave shape of the second column portion 22 and the phase of the wave shape of the third column portion 23 may coincide. Here, the wave shape is shifted in phase in the first direction such that the portion (third right portion 332) of the first column portion 21 that bulges toward the second direction DB1 and the portion (third right portion 332) of the second column portion 22 that bulges toward the second direction DB1 are not adjacent to each other. More preferably, the third right portion 332 of the first column portion 21 and the third left portion 331 of the second column portion 22 are disposed on an extension line in the second direction, that is, the first column portion 21 and the second column portion 22 are in a state of line symmetry centered on a straight line extending in the first direction between the first column portion 21 and the second column portion 22. In a mode in which the phase of the wave shape of the first column portion 21 and the phase of the wave shape of the second column portion 22 coincide, the length of the region sandwiched by the first column portion 21 and the second column portion 22 in the second direction DB is uniform. However, in the mode in which the phase of the wave shape of the first column portion 21 and the phase of the wave shape of the second column portion 22 are different, the length of the region sandwiched between the first column portion 21 and the second column portion 22 in the second direction DB is not uniform. When wiping is performed in the direction of the wave shape, dirt is easily guided into the concave portion without spreading because a narrow region exists between the row portions.

In addition, the first portion 31 of the first column portion 21 and the second portion 32 of the second column portion 22 may be adjacent. In other words, the second portion 32 of the second column portion 22 may be arranged on an extension line of the first portion 31 of the first column portion 21 in the second direction DB. In addition, it may be that the third left portion 331 of the first column portion is adjacent to the third right portion 332 of the second column portion 22, and the third right portion 332 of the first column portion 21 is adjacent to the third left portion 331 of the second column portion 22. It may be that the length of the first direction DA of the first part 31 is longer than the length of the second direction DB of the first part 31, and the length of the first direction DA of the second part 32 is longer than the length of the second direction DB of the second part DB. With this configuration, the region sandwiched between the first column portion 21 and the second column portion 22 has a rhombus shape. The interval in the second direction DB between the first column portion 21 and the second column portion 22 may be shortest at a portion where the third portion of the first column portion and the third portion of the second column portion face each other. More specifically, as shown in fig. 3, the distance G11 is the shortest at the portion where the third right portion 332 of the first column portion 21 and the third left portion 331 of the second column portion 22 face each other, and the distance G12 is the longest at the portion where the third left portion 331 of the first column portion 21 and the third right portion 332 of the second column portion 22 face each other. Since the interval in the second direction DB between the first row portion 21 and the second row portion 22 varies, the foreign matter on the convex portions 11 can be guided gradually to the narrow region between the convex portions 11 while being drawn into the concave portions 12, and can be guided finally to the region having the narrowest interval to be drawn into the concave portions 12 adjacent to the region.

The shortest distance G11 in the second direction DB between the first row portion 21 and the second row portion 22 may be equal to or greater than the width W12 of the recess 12 and equal to or less than 1/2 of the length L132 (see fig. 3) of the second direction DB of each row portion 13. If the shortest distance G11 is shorter than the width W12 of the concave portion 12, the convex portion 11 constituting the distance G11 is likely to fall down due to the concave portion 12 disposed with the distance G11 therebetween, and it may be difficult to maintain the shape of the convex portion 11. However, since the distance G11 of the shortest portion is equal to or greater than the width W12 of the concave portion 12, the shape of the convex portion 11 is easily maintained. Further, since the shortest distance G11 is equal to or less than 1/2 of the length L132 of the column portion 13 in the second direction DB, the region between the column portions 13 is suppressed from being too empty, and the effect of guiding foreign matter to the concave portion 12 in a concentrated manner is easily obtained. The length L132 of the second direction DB of the column portion 13 is both end edges (the distance between the left end edge of the third left portion and the right end edge of the third right portion) of the second direction DB of the column portion 13. In addition, the longest interval G12 of the first column portion 21 and the second column portion 22 in the second direction DB may be 20mm or less. Since the interval of the convex portions 11 in the second direction DB is 20mm or less, foreign matters easily come into contact with the convex portions 11, and the wiping property can be improved. In addition, the length of the first direction DA of one side of the diamond shape (for example, the pitch between the third portions in the first direction DA) may be 20mm or less. With this configuration, the foreign matter can easily come into contact with the projection 11, and the wiping performance can be improved.

As shown in fig. 3, the angle θ formed by the first portion 31 and the second portion 32 arranged with the third portion 33 therebetween may be an obtuse angle. In the concave portion 12, the length extending in the first direction DA can be made longer than the length extending in the second direction DB, compared to a structure in which the angle θ formed by the first portion 31 and the second portion 32 is an acute angle. The foreign matter is easily guided to the direction in which the column portion 13 extends, the diffusion of the foreign matter in the concave portion 12 is promoted, and the foreign matter can be continuously introduced into the concave portion 12.

The concave portion 12 of the present embodiment is formed by the convex portion 11 provided on the surface of the roll-shaped member for processing the nonwoven fabric. When the fibers of the portion corresponding to the concave portion 12 are moved around when the concave portion 12 is formed, the basis weight of the fibers of the convex portion 11 can be lower than the basis weight of the fibers of the concave portion 12. The convex portion protrudes more than the concave portion, and is likely to come into contact with skin and foreign matter. By increasing the basis weight of the projections, the pressing force of the hand during wiping becomes weak, and the hand is less likely to be directly transmitted to the skin, and the skin feel can be improved. The fiber density of the protrusions 11 may be substantially the same as the fiber density of the recesses 12. Since there is almost no density difference between the convex portions 11 and the concave portions 12, the movement of the body fluid due to the density gradient can be suppressed, the body fluid can be diffused over the entire sheet, and the wiping properties can be improved. Alternatively, the concave portions 12 may be formed by embossing, and when the concave portions 12 are formed, the portions corresponding to the concave portions 12 are compressed, the basis weight of the fibers in the concave portions 12 is substantially the same as the basis weight of the fibers in the convex portions, and the density of the fibers in the concave portions 12 is higher than the density of the fibers in the convex portions. As shown in fig. 4, the convex portions 11 and the concave portions 12 may be provided only on the front surface of the nonwoven fabric layer 10 (the surface located on the outer side of the skin care sheet 1) and not on the back surface of the nonwoven fabric layer 10.

The orientation direction of the fibers of the nonwoven fabric layer 10 may be along the second direction DB. The foreign matter can be guided by the fibers so as to span between the adjacent row portions 13, and the foreign matter can be suppressed from remaining between the row portions 13. Depending on the user, the skin care sheet 1 may be folded for use instead of being unfolded into a flat state. In this case, the wiping sheet is oriented in parallel with the fiber orientation of the nonwoven fabric, so that wiping is facilitated and foreign matter is easily guided to the recessed portions of the row portions.

A plurality of skin care sheets 1 are generally stacked in a folded state before use and are housed in a package. The fold of the sheet at this time may also extend in the second direction DB. According to this configuration, the foreign matter can be guided by the fold so as to span between the adjacent row portions 13, and the foreign matter can be prevented from remaining between the row portions 13. In another embodiment, the first direction DA extending along the column portion 13 may be used. With this configuration, foreign matter such as excrement can be easily guided in the first direction DA by the fold.

The fine recessed portions 14 having a depth smaller than that of the recessed portions 12 may be formed in the projecting portions 11. The depth F14 of the fine recessed portion is shallower than the depth F12 of the recessed portion 12. The fine recesses 14 may be dot-shaped and arranged at intervals in the first direction DA and the second direction DB. The fine recessed portions 14 allow fine foreign matter to be introduced. Further, the fine recessed portions 14 increase the surface area of the wiping sheet 1 during wiping, thereby further improving wiping performance.

While the present invention has been described in detail with reference to the above embodiments, it will be apparent to those skilled in the art that the present invention is not limited to the embodiments described in the present specification. The present invention can be implemented as modifications and variations without departing from the spirit and scope of the present invention defined by the claims. Therefore, the description of the present specification is for the purpose of illustration and description, and the present invention is not intended to be limited thereto.

In addition, japanese patent application No. 2020-142120, filed on 25/8/2020, is incorporated herein by reference in its entirety.

Industrial applicability of the invention

According to this aspect, a skin care sheet having concave portions and convex portions and capable of improving wiping performance of foreign matter on a skin surface can be provided.

Description of the reference numerals

1: a skin care sheet; 10: a non-woven fabric layer; 11: a convex portion; 12: a recess; 13: a row unit; 14: a fine concave portion; 21: a first column section; 22: a second column section; 23: a third column part; 31: a first portion; 32: a second portion; 33: a third portion; DA: a first direction; DB: a second direction.

Claims

1. A skin care sheet comprising a nonwoven fabric layer disposed on the surface thereof and having a first direction and a second direction orthogonal to each other in a plan view,

convex portions and concave portions recessed from the convex portions toward the back surface side are formed in the nonwoven fabric layer,

the concave portion has a wave-shaped column portion extending in the first direction in a plan view,

the plurality of column portions are arranged at intervals in the second direction.

2. The skin care sheet according to claim 1,

the convex portion is constituted by a region sandwiched by the wave-shaped column portions.

3. The sheet for skin care according to claim 1 or 2,

the column portions are continuous in the first direction.

4. The sheet for skin care according to any one of claims 1 to 3,

the wave shape of the column portion is composed of a first portion extending to one side of the first direction and extending to one side of the second direction, a second portion extending to one side of the first direction and extending to the other side of the second direction, and a third portion connecting the first portion and the second portion,

the third portion is curved.

5. The skin care sheet according to claim 4,

the column portion has a first column portion and a second column portion adjacent to the first column portion in the second direction,

the phase of the wave shape of the first row portion is shifted from the phase of the wave shape of the second row portion.

6. The skin care sheet according to claim 5,

the distance between the first row portion and the second row portion in the second direction is shortest in a portion where the third portion of the first row portion and the third portion of the second row portion face each other.

7. The skin care sheet according to claim 6,

the shortest distance between the first row portion and the second row portion in the second direction is equal to or greater than the width of the recess and equal to or less than 1/2 of the length of each row portion in the second direction.

8. The sheet for skin care according to any one of claims 4 to 7,

an angle formed by the first portion and the second portion arranged with the third portion interposed therebetween is an obtuse angle.

9. The sheet for skin care according to any one of claims 1 to 8,

the basis weight of the fibers of the protrusions is higher than the basis weight of the fibers of the recesses.

10. The sheet for skin care according to any one of claims 1 to 9,

the convex portion is formed with a fine concave portion having a depth shallower than the depth of the concave portion.