TWI839473B - Absorbent articles - Google Patents

Abstract

[Topic] To provide an absorbent article that is further improved by changing the basis weight of each sheet member (nonwoven fabric, etc.). [Solution] The absorbent article (1) has a longitudinal direction, a left-right direction, and a thickness direction that intersect each other in an unfolded state, and has: an absorbent body (10) for absorbing liquid; and an outer body (2), which includes: a first nonwoven fabric area (21a, 31a) having a plurality of openings (40), and a second nonwoven fabric area (22a, 32a), wherein the first nonwoven fabric area (2 The second non-woven fabric region (22a, 32a) is arranged on the skin-most side or the non-skin-most side in the thickness direction, the second non-woven fabric region (22a, 32a) overlaps the first non-woven fabric region (21a, 31a) in the thickness direction, and the weight per unit area of the first non-woven fabric region (21a, 31a) is greater than the weight per unit area of the second non-woven fabric region (22a, 32a).

Description

Absorbent articles

The present invention relates to absorbent articles.

In the past, absorbent articles, etc., which are outer coverings composed of at least two sheet members and have a plurality of openings in at least one of the two sheet members, have been known. For example, Patent Document 1 discloses a disposable wearable article in which a barrier sheet is interposed between a top sheet and a back sheet, and a group of air permeable holes is provided that penetrates the three sheets. In addition, Patent Document 2 discloses a shorts-type absorbent article having an outer covering composed of inner and outer sheet members, each of which has an opening.

[Prior Art Literature] [Patent Literature]

[Patent document 1] Japanese Patent Application No. 3-251245

[Patent Document 2] Japanese Patent Application No. 2015-128573

However, Patent Document 1 and Patent Document 2 do not disclose the basis weight (weight per unit area) of each sheet member of the outer casing composed of a plurality of sheet members having openings.

The present invention is made in view of the above-mentioned conventional problems, and its purpose is to provide an absorbent article that is further improved by changing the basis weight of each sheet member (nonwoven fabric, etc.).

The main invention for achieving the above-mentioned purpose is an absorbent article, which has a longitudinal direction, a left-right direction and a thickness direction that intersect each other in an unfolded state, and has: an absorbent body for absorbing liquid; and an outer body, which includes: a first non-woven fabric area with a plurality of openings, and a second non-woven fabric area. The absorbent article is characterized in that: the first non-woven fabric area is arranged on the skin-most side or the non-skin-most side in the thickness direction, the second non-woven fabric area overlaps the first non-woven fabric area in the thickness direction, the weight per unit area of the first non-woven fabric area is greater than the weight per unit area of the second non-woven fabric area, and the The 2 non-woven fabric area is an area without openings, and on one of the two surfaces of the first non-woven fabric area, there is a fiber protrusion in which the fibers protrude in the thickness direction at the edge adjacent to one of the plurality of openings, and the surface on which the fiber protrusion exists faces the second non-woven fabric area, and the first non-woven fabric area and the second non-woven fabric area are joined by a hot melt adhesive, and when the one opening is used as the first hole and an opening different from the one opening is used as the second hole, the area coated with the hot melt adhesive has an area continuous from the edge of the first hole to the edge of the second hole when viewed in the thickness direction.

Other features of the present invention can be clearly seen from the description in this specification and the attached drawings.

According to the present invention, an absorbent article that is further improved by changing the basis weight of each sheet member (nonwoven fabric, etc.) can be provided.

1: Absorbent articles

2:External body

10: Absorbent body

11: Absorber

20: Abdominal waist circumference

20a: Periphery

20b: Periphery

21: No. 1 nonwoven fabric

21a: 1st nonwoven fabric area

22: Second nonwoven fabric

22a: Second non-woven fabric area

23: Filamentous elastic component

24: Covered with non-woven fabric

25: Overlapping area

25’: Overlapping area

25e1: Upper end

25e2: Lower end

27: Non-joined part

27’: Non-joined part

30: Back waist area

31: No. 1 nonwoven fabric

31a: 1st nonwoven fabric area

32: Second nonwoven fabric

32a: Second non-woven fabric area

33: Filamentous elastic component

34: Covered with non-woven fabric

40: Opening

40a: Margin

40’: Opening

40a’: Margin

40ah: Melting part

40”: Opening

40aeh: Joint

40adi: aperture

40N: Area

42: Fiber protrusion

45: Opening

45’: Opening

45a: Margin

45a’: Margin

45adi: aperture

45aeh: Joint

50: Hot melt adhesive

55: Sales

60: Area overlapping with hot melt adhesive

65: Area that does not overlap with hot melt adhesive

70: Non-joined part

210: Non-skin side

310: Non-skin side

211: Side of the skin

311: Side of the skin

N45: Non-opening area

BH: Waist opening

LH: Leg opening

C10: roughly the center in the longitudinal direction

[Figure 1] is a schematic three-dimensional diagram of the paper diaper 1.

[Figure 2] is a schematic top view of the paper diaper 1 in an unfolded and stretched state, viewed from the skin side.

[Figure 3] is a schematic top view of the paper diaper 1 in an unfolded and stretched state, viewed from the non-skin side.

[Figure 4] is a schematic cross-sectional view along line A-A in Figure 2.

[Figure 5] is an enlarged view of the X region of the first non-woven fabric region 21a in Figure 3.

[Figure 6] is an enlarged view of the X region in Figure 3 when the color of the first non-woven fabric region 21a is different from the color of the second non-woven fabric region 22a.

[Figure 7], Figure 7A is a cross-sectional schematic diagram illustrating the process of forming the opening 40, Figure 7B is a cross-sectional schematic diagram illustrating the formation of the opening 40, and Figure 7C is a cross-sectional schematic diagram illustrating the bonding of the first non-woven fabric area 21a (31a) and the second non-woven fabric area 22a (32a).

[Figure 8] is a diagram showing an example of the configuration position of the hot melt adhesive 50 in the X area of Figure 3.

[Figure 9], Figure 9A shows an example of the configuration position of the hot melt adhesive 50 in the Y area of Figure 1, and Figure 9B shows an example of the configuration position of the hot melt adhesive 50 in the Y' area of Figure 1.

[Figure 10] is a schematic top view of another embodiment of the paper diaper 1 in an unfolded and stretched state as viewed from the skin side.

[Figure 11] is a schematic top view of another embodiment of the paper diaper 1 in an unfolded and stretched state as viewed from the non-skin side.

[Figure 12] is a schematic three-dimensional diagram of a paper diaper 1 in another embodiment.

[Figure 13] is an enlarged view of the Z region of Figure 12, and is a view showing the state where the outer layer 2 is separated into the non-woven fabric 21 and the non-woven fabric 22.

[Figure 14] is an enlarged view of the Z region of Figure 12, and is a view of the state where the non-woven fabric 21 and the non-woven fabric 22 are overlapped.

[Figure 15], Figure 15A is a schematic enlarged view for explaining an example of opening 40 and opening 45, and Figure 15B is a schematic enlarged view for explaining an example of opening 40 and opening 45.

Based on the descriptions in this manual and the attached drawings, at least the following matters should be understood.

An absorbent article has a longitudinal direction, a left-right direction, and a thickness direction that intersect each other in an unfolded state, and has: an absorbent body that absorbs liquid; and an outer body, which includes: a first non-woven fabric area having a plurality of openings, and a second non-woven fabric area. The absorbent article is characterized in that: the first non-woven fabric area is arranged on the skin-most side or the non-skin-most side in the thickness direction, the second non-woven fabric area overlaps the first non-woven fabric area in the thickness direction, and the weight per unit area of the first non-woven fabric area is greater than the weight per unit area of the second non-woven fabric area.

According to such an absorbent article, in the first non-woven fabric region having a greater weight per unit area (i.e., fiber amount per unit area) than that of the second non-woven fabric region, the fiber amount in the edge adjacent to each opening is further increased because the fibers existing in the opening portion are gathered at the edge. As a result, the color tone of the first non-woven fabric region becomes darker at the edge of the opening when viewed from above, making the outline of the opening more clearly visible. In addition, since the fiber amount per unit area is large, light does not pass through the edge of the opening in the first non-woven fabric region, and the color tone of the non-woven fabric is easily visible. On the other hand, the second non-woven fabric area with a small amount of fiber per unit area has a sense of transparency in order to allow light to pass through. By overlapping the first and second non-woven fabric areas in this way, the contrast between the color depth of the edge of each opening and the transparency of the second non-woven fabric area creates a visual effect, making the outline of each opening more clearly visible. In this way, the user can recognize the excellent breathability. Furthermore, the overlap with the second non-woven fabric area can be seen from each opening, which can avoid giving the impression that leakage occurs from the opening.

In such an absorbent article, it is desirable that white pigment is added to the fibers constituting the aforementioned edge portion of the aforementioned first non-woven fabric region.

According to such an absorbent article, by adding white pigment to the fibers at the edges of the openings constituting the first non-woven fabric area, the whiteness (concentration) of the edges of each opening is further increased, and because the color difference with each opening is conspicuous, the visibility of each opening is improved. This can further give the user the impression of excellent breathability.

In such an absorbent article, it is desirable that the color of the first non-woven fabric area is different from the color of the second non-woven fabric area.

According to such an absorbent article, the color of the first non-woven fabric area having the openings is different from the color of the second non-woven fabric area, so that the openings of the first non-woven fabric area can be more easily seen. By making it easier for the user to see the openings, the impression that the absorbent article has good breathability can be further given.

In such an absorbent article, it is desirable that the thickness of the first non-woven fabric area is thicker than the thickness of the second non-woven fabric area.

According to such an absorbent article, by making the thickness of the first non-woven fabric area thicker, a shadow can be provided at each opening, which can make the opening more conspicuous. Since each opening is easy to become conspicuous, it can further give the user the impression that the absorbent article has good breathability.

Such an absorbent article, wherein, on one of the two surfaces of the first non-woven fabric region, there is a fiber protrusion in which the fibers protrude in the thickness direction at the edge adjacent to the one opening, and the one surface where the fiber protrusion exists is joined to the second non-woven fabric region as desired.

According to such absorbent articles, since the openings are formed using heated pins, etc., there are fiber protrusions (so-called burrs) where the fibers are concentrated and protrude in the thickness direction at the edge adjacent to the openings on the surface opposite to the side where the pins are inserted in the first non-woven fabric area. Since the side where the fiber protrusions exist is joined to the second non-woven fabric, the surface opposite to the side where the fiber protrusions exist is smooth without bumps. Thus, when the first non-woven fabric area is arranged on the side closest to the skin, the skin touch is good, and when it is used on the side closest to the non-skin, it is not easy to get caught in clothing when worn.

Such an absorbent article, wherein the outer cover is preferably provided at the abdominal waist portion located at one end side of the aforementioned longitudinal direction of the aforementioned absorbent body, or at the dorsal waist portion located at the other end side of the aforementioned longitudinal direction of the aforementioned absorbent body.

According to such an absorbent article, since an outer body is provided at the abdominal waist or dorsal waist, a plurality of openings are formed in the first non-woven fabric area at the abdominal waist or dorsal waist. This ensures the breathability of the waist of the wearer who sweats easily and prevents skin rashes.

In such an absorbent article, it is desirable that the second non-woven fabric area is composed of a spunbonded non-woven fabric.

According to such an absorbent article, the basis weight is lower because the second non-woven fabric area is made of spunbond non-woven fabric, compared to the case where the second non-woven fabric area is made of hot air non-woven fabric, etc. Therefore, it allows more light to pass through than the first non-woven fabric area as a whole, creating a sense of transparency. By overlapping such a second non-woven fabric area with the first non-woven fabric area, the openings of the first non-woven fabric area are more conspicuous, giving the user the impression that good breathability is maintained.

In such an absorbent article, it is desirable that at least a portion of the aforementioned edge adjacent to the aforementioned opening has a fusion zone.

According to such an absorbent article, when the opening is formed using a heated pin or the like, at least a portion of the fibers at the edge adjacent to the opening melt and cool to solidify, thereby improving the whiteness. Since the whiteness of the edge is improved, the outline of the opening becomes more conspicuous. This can give the wearer the impression that excellent breathability is maintained.

In such an absorbent article, the first non-woven fabric area and the second non-woven fabric area are joined by a heat-melting adhesive, and when the one opening is used as the first hole and an opening different from the one opening is used as the second hole, it is desirable that the first hole has an area overlapping with the heat-melting adhesive, and the second hole has only an area not overlapping with the heat-melting adhesive.

According to such an absorbent article, the first hole overlapping with the heat-melting adhesive maintains the shape of the opening by the heat-melting adhesive. On the other hand, the second hole in the area not overlapping with the heat-melting adhesive can ensure breathability.

Such an absorbent article is desirable in which the first hole has an area overlapping with the thermal adhesive and an area not overlapping with the thermal adhesive.

According to such an absorbent article, the shape of the opening is maintained in the area overlapping with the heat-melting adhesive, so that the beauty of the opening can be maintained. At the same time, the air permeability can be ensured by having an area that does not overlap with the heat-melting adhesive.

Such an absorbent article, wherein the first non-woven fabric area and the second non-woven fabric area have an overlapping area overlapping each other in the thickness direction, and it is desirable that the first non-woven fabric area and the second non-woven fabric area have a non-joined portion not joined by a thermal adhesive at one end or the other end of the overlapping area in the longitudinal direction.

According to such an absorbent article, at least a portion of the peripheral portion of the outer body does not become hard and can maintain softness because the first non-woven fabric area and the second non-woven fabric area are not bonded by a heat-sealing agent. Since the peripheral portion of the outer body is often in direct contact with the skin, such a peripheral portion is soft and has a good skin touch, and is less likely to hurt the skin.

In such an absorbent article, it is desirable that the second non-woven fabric area has a plurality of openings.

According to such an absorbent article, both the first and second non-woven fabric regions have openings, so the number of openings increases and the breathability improves.

Such an absorbent article, wherein the aforementioned one opening overlaps with one of the aforementioned multiple openings in the aforementioned second non-woven fabric area, and the edge adjacent to the aforementioned one opening and the edge adjacent to the aforementioned one opening are joined to each other as desired.

According to such an absorbent article, the openings in the first non-woven fabric area and the openings in the second non-woven fabric area become through holes, and the edges of the openings are joined by melting or welding, thereby improving the breathability and visibility of the openings.

Such an absorbent article, wherein at least a portion of the aforementioned opening overlaps with a non-opening area without openings in the aforementioned second non-woven fabric area is desirable.

According to such an absorbent article, the air permeability of the portion where the openings overlap is further improved. In addition, by comparing the portion where the openings overlap with the non-opening area without openings in the second non-woven fabric area with the transparency of the second non-woven fabric area, the shadow of the opening is emphasized, thereby improving visibility.

In such an absorbent article, it is desirable that the edge adjacent to the aforementioned opening and the aforementioned non-opening area have a non-joined portion that is not joined to each other.

According to such an absorbent article, since the edge of the above-mentioned opening and the non-opening area overlapping at least a portion of the opening are not joined to each other, the skin touch is good and softness can be maintained.

Such an absorbent article, wherein the hole diameter of the aforementioned opening is larger than the hole diameter of the opening formed in the aforementioned second non-woven fabric area, and it is desirable that the opening formed in the aforementioned second non-woven fabric area is located inside the aforementioned opening when viewed from above.

According to such an absorbent article, the openings in the first non-woven fabric area overlap with the openings in the second non-woven fabric area, thereby further improving the breathability. In addition, the overlapping openings emphasize the shadows, thereby improving the visibility of the openings.

===Implementation form===

Hereinafter, the absorbent article of the present invention will be described by taking a disposable diaper of a shorts type for infants and young children as an example. However, it is not limited to the above, and the absorbent article of the present invention can also be applied as a disposable diaper for adults, a disposable diaper of a tape type, a sanitary napkin of a panty type, etc.

<Structure of disposable diaper 1>

FIG1 is a schematic three-dimensional view of a shorts-type disposable diaper 1 (hereinafter referred to as "diaper 1"). FIG2 is a schematic top view of the diaper 1 in an unfolded and stretched state viewed from the skin side. FIG3 is a schematic top view of the diaper 1 in an unfolded and stretched state viewed from the non-skin side. FIG4 is a schematic cross-sectional view taken along line A-A of FIG2.

Here, the above-mentioned "expanded state" refers to the state in which the diaper 1 is unfolded on a plane by untying the two ends of the abdominal part (abdominal waist part 20 described later) and the two ends of the back part (back waist part 30 described later) in the left and right directions of the diaper 1, and the diaper 1 is opened in its longitudinal direction while separating the abdominal part from the back part. In addition, the "stretched state" of the diaper 1 refers to the state in which the entire diaper 1 (the entire product) is stretched to a state without wrinkles. Specifically, the size of each component constituting the diaper 1 (for example, the absorbent body 10 described later, the waist parts 20, 30, etc.) is stretched to the size that is consistent with or close to the size of the component alone.

The diaper 1 has mutually intersecting up-down direction, left-right direction and front-back direction in the pants-shaped state (Fig. 1). The diaper 1 is a so-called three-piece type, that is, it has an absorbent body 10 attached to the crotch of the wearer to absorb liquids such as excrement, and an outer body 2 covering the waist of the wearer. The outer body 2 has: an abdominal waist part 20 covering the abdomen, and a back waist part 30 covering the back. The diaper 1 is formed with a waist opening BH and a pair of leg openings LH. The upper side in the up-down direction corresponds to the waist opening BH side, and the lower side corresponds to the crotch side. In addition, the front side in the front-back direction corresponds to the abdomen of the wearer, and the back side corresponds to the back of the wearer.

In the unfolded state, as shown in FIG2, the diaper 1 has a longitudinal direction, a left-right direction, and a thickness direction that intersect each other. In the following, one side of the longitudinal direction in the unfolded state is also referred to as the "abdominal side" or the "front side", and the other side of the longitudinal direction is also referred to as the "dorsal side" or the "rear side". The longitudinal direction in the unfolded state is the direction along the up-down direction of the pants-shaped state. In addition, the thickness direction is the direction in which the materials constituting the diaper 1 are stacked, as shown in FIG4. In the thickness direction, the side that contacts the wearer is the skin side, and the opposite side is the non-skin side.

In the unfolded paper diaper 1 of FIG. 2 , the central portion of the abdominal waistline 20 in the left-right direction overlaps the end of one side in the longitudinal direction of the absorbent body 10, and the central portion of the dorsal waistline 30 in the left-right direction overlaps the end of the other side in the longitudinal direction of the absorbent body 10. The unfolded paper diaper 1 is folded in half at the approximate central portion C10 in the longitudinal direction, and the left-right side portions of the abdominal waistline 20 and the dorsal waistline 30 are respectively joined by melting or the like, thereby forming the paper diaper 1 in the pants-shaped state shown in FIG. 1

The absorbent body 10 may include an absorbent body 11, a liquid-permeable top sheet (not shown) disposed on the skin side of the absorbent body 11, and a liquid-impermeable back sheet (not shown) disposed on the non-skin side of the absorbent body 11. The absorbent body 11 may be one that absorbs and retains excreta such as urine, i.e., one that forms liquid-absorbent fibers such as pulp containing superabsorbent polymer (SAP) into a predetermined shape.

The outer body 2 (abdominal waistline portion 20 and dorsal waistline portion 30) comprises, as shown in FIG4, first nonwoven fabrics 21, 31 arranged on the non-skin side in the thickness direction thereof, second nonwoven fabrics 22, 32 arranged on the skin side of the wearer more than the first nonwoven fabrics 21, 31, a plurality of filamentary elastic members 23, 33, and covering nonwoven fabrics 24, 34. The first nonwoven fabrics 21, 31 and the second nonwoven fabrics 22, 32 are arranged on the non-skin side more than the absorbent body 10. The covering nonwoven fabrics 24 and 34 are arranged closer to the skin than the absorbent body 10, and are shorter in length in the vertical direction than the second nonwoven fabrics 22 and 32, etc., and cover the ends of the absorbent body 10 in the longitudinal direction.

The first nonwoven fabrics 21, 31; the second nonwoven fabrics 22, 32; and the covering nonwoven fabrics 24, 34 are made of thermoplastic resin fibers. For example, single fibers of thermoplastic resins such as polypropylene (PP) and polyethylene (PE); composite fibers of sheath-core structures of PP and PE, etc. can be exemplified.

The plurality of thread-like elastic members 23, 33 are arranged in the vertical direction between the first non-woven fabrics 21, 31 and the second non-woven fabrics 22, 32 and fixed in a state of being stretched in the left and right directions. Moreover, stretchability is imparted to the abdominal waistline 20 and the back waistline 30. In addition, thread-like elastic members 23, 33 can be exemplified by thread-like rubber, elastic fiber, etc.

In addition, a plurality of openings 40 are formed at intervals in the first non-woven fabrics 21 and 31. The shape of the openings 40 is not limited to the circular shape shown in the figure, and can be various shapes.

In addition, although there is also an outer body formed with a plurality of openings penetrating the first non-woven fabric 21, 31 and the second non-woven fabric 22, 32, such an outer body may give the wearer the impression that good breathability is maintained and leakage may occur from each opening. In order to eliminate the anxiety about leakage, it is also considered to configure the opening part not to be a through hole, but to overlap the opening with other sheet components. However, if other sheet components are simply overlapped, there is a possibility that the outline of the opening will be difficult to see.

In this regard, the outer body 2 of the present invention is described. As shown in FIG. 3 and FIG. 4, the outer body 2 is a first non-woven fabric 21, 31 having a first non-woven fabric region 21a, 31a with a plurality of openings 40. In addition, the outer body 2 is a second non-woven fabric 22, 32 having a second non-woven fabric region 22a, 32a. In the present embodiment, the first non-woven fabric region 21a, 31a is arranged on the non-skin side in the thickness direction, and when viewed in the thickness direction, overlaps with the second non-woven fabric 22, 32 respectively. In the present embodiment, the second non-woven fabric area 22a, 32a is the entire area of the second non-woven fabric 22, 32, and as shown in FIG4, when viewed in the thickness direction, it overlaps the area of the first non-woven fabric area 21a, 31a. In addition, even if other sheet members are provided in a part closer to the non-skin side than the first non-woven fabric 21, 31, the area that is most disposed on the non-skin side and overlaps with the second non-woven fabric 22, 32 becomes the first non-woven fabric area 21a, 31a.

Fig. 5 is an enlarged view of the X region of the first non-woven fabric region 21a of Fig. 3. The openings 40 provided in the first non-woven fabric regions 21a and 31a can be formed, for example, using a heated pin member (a pin 55 described later). When each opening 40 is formed, the edge 40a adjacent to the opening 40 is usually melted and solidified (for example, the portion with a width of 2 mm from the opening 40 toward the outside is regarded as the "edge"). Furthermore, in order to improve the visibility of the openings 40 formed in the first non-woven fabric regions 21a and 31a superimposed on the second non-woven fabric regions 22a and 32a when viewed in the thickness direction, it is desirable that the weight per unit area (so-called basis weight) of the first non-woven fabric regions 21a and 31a is greater than the weight per unit area of the second non-woven fabric regions 22a and 32a.

Here, "weight per unit area (basis weight)" refers to, for example, the average value of the results of measuring the basis weight at a plurality of locations (e.g., 10 locations) in the first non-woven fabric regions 21a and 31a. Specifically, the weight per unit area of the first non-woven fabric regions 21a and 31a obtained in this way is preferably 18 g/ ^m2 . Furthermore, the weight per unit area of the second non-woven fabric regions 22a and 32a is preferably 13 g/ ^m2 . The measurement of the weight per unit area of the second non-woven fabric regions 22a and 32a is also the average value of the results of measuring at a plurality of locations (e.g., 10 locations).

The weight per unit area of the first non-woven fabric region 21a, 31a and the second non-woven fabric region 22a, 32a here refers to the fiber amount per unit area. That is, the edge 40a (40a') adjacent to each opening 40 (40') provided in the first non-woven fabric region 21a, 31a having a larger weight per unit area than the second non-woven fabric region 22a, 32a, has a larger fiber amount because the fibers existing in the opening portion are gathered. By gathering the fibers at the edges 40a (40a'), the color tone of the edges 40a (40a') of the openings 40 (40') in the first non-woven fabric regions 21a and 31a becomes darker when viewed from above, resulting in a color difference with the openings 40 (40'). As a result, the outline of the openings 40 (40') becomes more clearly visible. In addition, the edges 40a (40a') of the openings 40 (40') of the first non-woven fabric regions 21a and 31a, which have a large amount of fibers per unit area, do not allow light to pass through, making the color tone of the non-woven fabric easy to see clearly. On the other hand, the second non-woven fabric regions 22a and 32a, which have a small amount of fibers per unit area, have a sense of transparency in order to allow light to pass through. By overlapping the first non-woven fabric areas 21a, 31a and the second non-woven fabric areas 22a, 32a, the contrast between the color depth of the edge 40a (40a') of each opening and the transparency of the second non-woven fabric areas 22a, 32a produces a visual effect. As a result, the outline of each opening 40 (40') becomes more visible. Since each opening 40 (40') is easy to see, the user can recognize the excellent breathability. Furthermore, the overlap of each opening 40 (40') with the second non-woven fabric areas 22a, 32a can be seen, which can avoid giving the impression that leakage occurs from each opening 40 (40').

In addition, in the above-mentioned embodiment, although the first non-woven fabric area 21a, 31a is arranged on the non-skin side in the thickness direction, it can also be arranged on the skin side. In this way, the user can be aware that the inner side (skin side) of the absorbent article has good air permeability. This will be described later.

In addition, in the first nonwoven fabric area 21a, 31a, white pigment can also be added to the fiber constituting the edge 40a adjacent to the opening 40. As for the white pigment, titanium oxide and the like can be exemplified. By adding white pigment, the whiteness (concentration) of the edge 40a of each opening 40 is further increased, and because the color difference with each opening 40 is conspicuous, the visibility of each opening 40 is improved. In this way, the user can be further impressed with the excellent breathability. Here, "whiteness" refers to the degree of whiteness of the diaper 1 as a fiber product that can be measured by the whiteness measurement method for fiber products specified in JIS L 1916.

Furthermore, the color of the first non-woven fabric area 21a, 31a may be different from the color of the second non-woven fabric area 22a, 32a. FIG. 6 is an enlarged view of the X region of the first non-woven fabric area 21a of FIG. 3 when the color of the first non-woven fabric area 21a is different from the color of the second non-woven fabric area 22a. Here, the color of the second non-woven fabric area 22a is represented by a checkered pattern, and the color of the second non-woven fabric area 22a can be seen from each opening 40 (40') of the first non-woven fabric area 21a. In addition, the different colors mentioned here refer to the situation where the color difference between the colors of the two areas can be seen as two colors with the naked eye. "Color difference" can be obtained by measuring the color of two points (two areas) to be measured using a commercially available colorimeter and comparing the digitized values according to the CIE1976 (L*a*b*) color space specified in JIS Z 8729, etc. Specifically, when the difference in L* between the two points to be measured is △L*, the difference in a* is △a*, and the difference in b* is △b*, the color difference can be obtained by the formula △E*ab=[(△L*) ² +(△a*) ² +△b*) ² ] ^1/2 . Then, if the △E*ab value is 1.5 or more, it can be said that there is a color difference to the extent that the human eye can perceive it. Therefore, here, when the color difference △E*ab is 1.5 or more, and is expected to be 3.0 or more, it means that the colors are "different from each other." In addition, in this embodiment, the difference in brightness of the two colors (the above-mentioned ΔL*) is ideal. By making the colors different from each other, the openings 40 (40') of the first non-woven fabric area 21a can be more easily seen according to such an absorbent article. By making it easier for the user to see and recognize the openings 40 (40'), the absorbent article 1 can be further given the impression that it has good air permeability.

Furthermore, it is desirable that the thickness of the first non-woven fabric area 21a, 31a is thicker than the thickness of the second non-woven fabric area 22a, 32a. "Thickness" refers to the average value of the results of measuring a plurality of locations (e.g., 10 locations) in each edge 40a adjacent to a plurality of openings 40 in the first non-woven fabric area 21a, 31a using a thickness meter (e.g., digital microscope VHX-2000 manufactured by KEYENCE). When measuring the thickness, the non-woven fabric sample is immersed in liquid nitrogen to freeze it, cut with a razor, and after returning to room temperature, the thickness is measured by a digital microscope at a magnification of 50 times or more. The thickness of the first non-woven fabric area 21a, 31a measured using this method is 480μm as expected, and the thickness of the second non-woven fabric area 22a, 32a is 190μm as expected. In addition, the measurement of the thickness of the second non-woven fabric area 22a, 32a is also the average value of the results of measuring multiple locations (for example, 10 locations) in the second non-woven fabric area 22a, 32a using the above-mentioned measuring device.

By making the thickness of the first non-woven fabric regions 21a and 31a thicker, a shadow can be provided at each opening 40, making the opening 40 more conspicuous. Since each opening 40 is easily conspicuous, the user can be further impressed that the absorbent article 1 has good breathability.

FIG. 7A is a schematic cross-sectional view illustrating the process of forming the opening 40, FIG. 7B is a schematic cross-sectional view illustrating the formed opening 40, and FIG. 7C is a schematic cross-sectional view illustrating the bonding of the first non-woven fabric area 21a (31a) and the second non-woven fabric area 22a (32a).

In this embodiment, the opening 40 is formed by the heated pin 55. As a result, the fibers (thermoplastic resin fibers) around the pin 55 soften and then harden, and the shape of the opening 40 is easily maintained. In addition, as shown in FIG. 7A, if the two surfaces of the first non-woven fabric area 21a, 31a are the non-skin side surfaces 210, 310 and the skin side surfaces 211, 311, the heated pin 55 is inserted from the non-skin side surfaces 210, 310, penetrates, and then is pulled out, whereby the fibers existing in the portion of the opening 40 (for example, one opening 40') protrude from one of the two surfaces (the skin side surfaces 211, 311). Thus, the presence of a fiber protrusion 42 (FIG. 7B) in which the fiber protrudes in the thickness direction at the edge 40a' adjacent to an opening 40' may also cause concern of irritating the wearer's skin.

In this regard, the present embodiment is as shown in FIG. 7C, where the side where the fiber protrusion 42 exists (skin-facing side 211, 311) is joined to the second non-woven fabric area 22a, 32a. Because the side where the fiber protrusion 42 exists is joined to the second non-woven fabric area 22a, 32a, the non-skin-facing side 210, 310 of the first non-woven fabric area 21a, 31a is smooth without any bumps. Thus, when the first non-woven fabric area 21a, 31a is arranged closest to the skin in the present embodiment, the skin touch is good. In addition, when the first non-woven fabric area 21a, 31a is arranged closest to the non-skin side, it is not easy to get caught in clothes when worn.

In addition, the outer body 2 having the first non-woven fabric area 21a, 31a and the second non-woven fabric area 22a, 32a in the present embodiment can also be provided at either the abdominal waist circumference portion 20 located at one end side (abdomen side) in the longitudinal direction of the absorbent body 1 or the back waist circumference portion 30 located at the other end side (back side) in the longitudinal direction of the absorbent body 1. The outer body 2 having the first non-woven fabric area 21a (or 31a) and the second non-woven fabric area 22a (or 32a) is provided, and a plurality of openings 40 of the first non-woven fabric area 21a (or 31a) are provided at the abdominal waist circumference portion 20 or the back waist circumference portion 30. In this way, the breathability of the waist of the wearer who is prone to sweating can be ensured, and skin rashes can be prevented.

Furthermore, it is desirable that the second non-woven fabric regions 22a and 32a are made of spunbond non-woven fabric. Compared with the case where the second non-woven fabric regions 22a and 32a are made of hot air non-woven fabric, SMS non-woven fabric (spunbond, melt-blown, spunbond non-woven fabric), etc., the spunbond non-woven fabric has a lower basis weight of the fiber. Thus, the second non-woven fabric regions 22a and 32a as a whole can allow light to pass through more than the first non-woven fabric regions 21a and 31a, thereby creating a sense of transparency. By overlapping the second non-woven fabric areas 22a and 32a with the first non-woven fabric areas 21a and 31a, the openings of the first non-woven fabric areas 21a and 31a are made more conspicuous, giving the user the impression that good breathability is maintained.

In addition, the opening 40 of the present embodiment is formed using a heated pin 55. Here, as shown in FIG. 5 and FIG. 6, at least a portion of the edge 40a' adjacent to an opening 40' has a melting portion 40ah. That is, when the opening 40 is formed, at least a portion of the fiber of the edge 40a' adjacent to an opening 40' is melted, cooled, and solidified to improve the whiteness. Because the whiteness of the edge 40a' is improved, the outline of the opening 40' becomes more conspicuous. Thereby, the wearer can more easily see each opening 40.

Furthermore, the first non-woven fabric area 21a, 31a and the second non-woven fabric area 22a, 32a may be joined by a hot melt adhesive 50. FIG. 8 shows an example of the configuration position of the hot melt adhesive 50 in the X area of FIG. 3. FIG. 9A shows an example of the configuration position of the hot melt adhesive 50 in the Y area of FIG. 1, and FIG. 9B shows an example of the configuration position of the hot melt adhesive 50 in the Y' area of FIG. 1.

Here, as shown in FIG8 , when an opening 40' is used as the first hole 40', the first hole 40' has an area 60 (a portion indicated by a downward slash) overlapping with the hot melt adhesive 50. Furthermore, when an opening different from the opening 40' is used as the second hole 40", the second hole 40" has only an area 65 that does not overlap with the hot melt adhesive 50. In this case, the first hole 40' overlapping with the hot melt adhesive 50 maintains the shape of the opening 40' by the hot melt adhesive 50. On the other hand, the second hole 40" having an area that does not overlap with the hot melt adhesive 50 ensures air permeability.

Furthermore, if the first hole 40' is viewed, the first hole 40' has an area 60 overlapping with the hot melt adhesive 50 and an area 65 not overlapping with the hot melt adhesive 50. In the first hole 40' having both the area 60 overlapping with the hot melt adhesive 50 and the area 65 not overlapping with the hot melt adhesive 50, the shape of the opening 40' is maintained by the overlapping area 60, so that the beauty of the opening 40' can be maintained. At the same time, the air permeability can be ensured by the area 65 not overlapping.

In addition, as for the hot melt adhesive, for example, EVA system, elastic system, olefin system, polyester‧polyamide system, etc. can be used. In addition, it is necessary to prevent the surface of the hot melt adhesive 50 applied from the opening 40 from sticking, and it is desired to use a low-adhesive or non-adhesive hot melt adhesive with low adhesive force (that is, low adhesion). As for the low-adhesive or non-adhesive hot melt adhesive, as for the base polymer, a hot melt adhesive using an olefin material can be exemplified. In addition, as for the application method of the hot melt adhesive, well-known application methods such as spiral coating that can be applied in a spiral shape, omega coating that can be applied in a wavy shape, and controlled stitch coating can be exemplified.

Next, the Y region of FIG. 1 shown in FIG. 9A is a part of the abdominal waistline portion 20 of the absorbent article 1, and has an overlapping region 25 (FIG. 9A) where the first non-woven fabric region 21a and the second non-woven fabric region 22a overlap each other in the thickness direction. At the upper end (one end) 25e1 in the vertical direction (longitudinal direction) of the overlapping region 25, there is a non-joined portion 27 where the first non-woven fabric region 21a and the second non-woven fabric region 22a are not joined by a thermal adhesive. The upper end (one end) 25e1 of the overlapping region 25 is a portion that rubs against the skin of the wearer particularly much not only when putting on and taking off the absorbent article 1, but also during wearing. Since the upper end 25e1 of the overlapping area 25 is not bonded by the hot melt adhesive 50, the end 25e1 will not become hard and can maintain its softness. As a result, even if there are many opportunities for direct contact with the skin, the skin touch is good and it is not easy to hurt the skin.

Similarly, the Y' region of FIG. 1 shown in FIG. 9B is a part of the lower side of the abdominal waistline portion 20 of the absorbent article 1, and has an overlapping region 25' (FIG. 9B) where the first non-woven fabric region 31a and the second non-woven fabric region 32a overlap each other in the thickness direction. At the lower end (the other end) 25e2 in the vertical direction (longitudinal direction) of the overlapping region 25', there is a non-joined portion 27' where the first non-woven fabric region 31a and the second non-woven fabric region 32a are not joined by a hot melt adhesive. The lower end (the other end) 25e2 of the overlapping region 25' is the portion that contacts the wearer's thigh more. Moreover, as shown in FIG. 9B , since the lower end portion 25e2 has a non-joined portion 27' that is not joined by the hot melt adhesive 50, the lower end portion 25e2 will not become hard and can maintain its softness. Thus, even if the lower end portion 25e2 has many opportunities to directly contact the skin in coordination with the movement of the wearer's foot, the skin touch is good and it is not easy to hurt the skin.

===Other implementation forms===

Although the above is an explanation of the implementation form of the present invention, the above implementation form is for the purpose of facilitating the understanding of the present invention, and is not intended to limit the interpretation of the present invention. In addition, the present invention can be changed and improved as long as it does not deviate from its purpose, and it goes without saying that the present invention also includes its equivalents.

In the above-mentioned embodiment, the first non-woven fabric area 21a, 31a is arranged on the non-skin side, but it can also be arranged on the skin side. Fig. 10 is a schematic top view of the diaper 1 of another embodiment in the unfolded and stretched state viewed from the skin side, showing an example of the first non-woven fabric area 21a, 31a arranged on the skin side. Here, the first non-woven fabric 21, 31 is arranged on the skin side in the thickness direction, and the second non-woven fabric 22, 32 is arranged on the non-skin side closer to the wearer than the first non-woven fabric 21, 31. Thus, the first non-woven fabric area 21a, 31a having a plurality of openings 40 is arranged on the skin-most side, and the second non-woven fabric area 22a, 32a is arranged on the non-skin side relative to the first non-woven fabric area 21a, 31a. The plurality of openings 40 of the present invention are present in the area in contact with the wearer's skin, and even if the wearer sweats, the excellent breathability reduces the stuffiness, and the wearer can wear the garment comfortably for a long time. In addition, because the second non-woven fabric area 22a, 32a is provided on the non-skin side relative to each opening 40, the concern about leakage from each opening 40 can be eliminated.

In the above-mentioned embodiment, as shown in FIG3, a three-component disposable diaper 1 is illustrated as an example of an absorbent article, but the invention is not limited thereto. FIG11 is a schematic top view of another embodiment of a diaper 1 in an unfolded and stretched state as viewed from the non-skin side. The diaper 1 of FIG11 is a two-component disposable diaper 1. The two-component disposable diaper refers to a diaper having an outer body 2 having a two-layer structure with an abdominal portion, a crotch portion, and a back portion as a first part, and an absorbent body 10 fixed to the skin side of the outer body 2 as a second part. Here, a first non-woven fabric 21 (first non-woven fabric area 21a) is arranged on the non-skin side of the outer body 2. Moreover, the second non-woven fabric area 22a is arranged closer to the skin than the first non-woven fabric area 21a in a manner that overlaps the first non-woven fabric area 21a in the thickness direction. In the case of the two-component type, the area of the first non-woven fabric area 21a including the crotch can be made larger. In this case, the user can clearly see that there are many openings 40, and can recognize better breathability. Furthermore, the overlap with the second non-woven fabric area 22a can be seen from each opening 40, which can avoid giving the impression that leakage occurs from the opening 40.

In addition, in the above-mentioned embodiment, although the second non-woven fabric area 22a, 32a is provided with openings, the second non-woven fabric area 22a, 32a may also have a plurality of openings. FIG. 12 is a schematic three-dimensional view of a paper diaper 1 in another embodiment. FIG. 13 is an enlarged view of the Z area of FIG. 12, and is a view showing the state where the outer layer 2 is separated into the first non-woven fabric 21 and the second non-woven fabric 22. In addition, in FIG. 13, elastic components that may exist between the first non-woven fabric 21 and the second non-woven fabric 22 are omitted.

In this embodiment, as an example, a portion of the abdominal waistline 20 of the outer body 2 is provided with a plurality of openings 45 formed in a state where the first non-woven fabric 21 and the second non-woven fabric 22 are overlapped. Similarly, a portion of the back waistline 30 of the outer body 2 is also provided with a plurality of openings 45 formed in a state where the first non-woven fabric 31 and the second non-woven fabric 32 are overlapped. In this embodiment, although the openings 45 are provided on both sides of the abdominal waistline 20 and the back waistline 30, it may be provided on only one side. In the following, the abdominal waistline 20 is described as representing both.

Even in this embodiment, the first non-woven fabric region 21a is arranged on the non-skin side in the thickness direction and is the region overlapping with the second non-woven fabric 22 when viewed in the thickness direction, and the second non-woven fabric region 22a is the entire region of the second non-woven fabric 22 and is the region overlapping with the first non-woven fabric region 21a when viewed in the thickness direction. Moreover, in this embodiment, the first non-woven fabric region 21a and the second non-woven fabric region 22a have a plurality of openings 45 in a portion of the region that does not overlap with the absorbent body 10 when viewed in the thickness direction. Thus, when the Z region of FIG. 12 is viewed, as shown in FIG. 13, the first non-woven fabric 21 (first non-woven fabric region 21a) side has openings 40 and 45, and the second non-woven fabric 22 (second non-woven fabric region 22a) side has openings 45. In addition, since the overlapping portion of the openings 40 and 45 usually becomes the opening portion, the outline of each opening becomes invisible, but in FIG. 12 and FIG. 13 (and FIG. 14 and FIG. 15 described later), the outline of each opening is left as a solid line for the convenience of explanation. Not only the first non-woven fabric region 21a, but also the second non-woven fabric region 22a has a plurality of openings 45, and overall, the number of openings increases, making it easier to ensure breathability. In addition, since the opening 45 is a through hole that penetrates the first non-woven fabric area 21a and the second non-woven fabric area 22a, visibility is good. Moreover, as in the present embodiment, the opening 45 is provided in an area that does not overlap with the absorbent body 10 when viewed in the thickness direction, so there is no sense of uneasiness about leakage of the absorbed liquid. Furthermore, the side of the first non-woven fabric 21 with a large weight per unit area has good cushioning properties by gathering fibers at each edge 40a, so when the first non-woven fabric 21 is used on the inner or outer side of the waistline (20, 30), a difference in cushioning properties can also be given.

Fig. 14 is an enlarged view of the Z region of Fig. 12, and is a view showing a state where the first non-woven fabric 21 and the second non-woven fabric 22 are overlapped. If one opening 40' among the plurality of openings 40 of the first non-woven fabric 21 (first non-woven fabric region 21a) is viewed as an example, the opening 40' may overlap with one opening 45' among the plurality of openings 45 provided on the side of the second non-woven fabric 22 (second non-woven fabric region 22a). In addition, the edge 40a' adjacent to the one opening 40' and the edge 45a' adjacent to the one opening 45' have at least a portion of the joints 40aeh and 45aeh joined to each other. The joints 40aeh and 45aeh are formed by melting and cooling at least a portion of the overlapping portion of the edge 40a of the opening 40 and the edge 45a of the opening 45 when the opening 45 is formed in a manner penetrating the first non-woven fabric 21 and the second non-woven fabric 22. Moreover, even if the overlapping portion of the edge 40a and the edge 45a is not melted, if a hot melt adhesive is used for bonding the first non-woven fabric 21 and the second non-woven fabric 22, the joints 40aeh and 45aeh can be formed by such an adhesive.

As mentioned above, the overlapping portion of the opening 40 (40') and the opening 45 (45') can further improve the breathability. In addition, since the joints 40aeh and 45aeh are made of gathered fibers, the outline of the opening 40 (45) becomes clearer, making it more visible.

Fig. 15A is a schematic enlarged view for explaining an example of the opening 40 and the opening 45. As in Fig. 14, one of the plurality of openings 40 of the first non-woven fabric 21 (first non-woven fabric region 21a) is defined as an opening 40', and one of the plurality of openings 45 provided on the side of the second non-woven fabric 22 (second non-woven fabric region 22a) is defined as an opening 45'. Furthermore, in the second non-woven fabric 22 (second non-woven fabric region 22a), the region without the opening 45 is defined as a non-opening region N45 (a portion indicated by a downward slash). As shown in Fig. 15A, at least a portion of the opening 40' has a region 40N (a portion indicated by a grid pattern) overlapping with the non-opening region N45 of the second non-woven fabric region 22a. Thus, the overlapped openings (40', 45') further enhance the breathability, and the overlapped openings 40' and the non-opening area N45 enhance the visibility by emphasizing the shadow of the openings 40' through the contrast of the transparency of the second non-woven fabric area 22a.

Furthermore, it is ideal that the edge 40a' adjacent to an opening 40' and the non-opening area N45 have a non-joined portion 70 that is not joined to each other. Since there is no joining of the edge 40a' where the fibers are easily hardened and the non-opening area N45 where there is no opening 45 in the second non-woven fabric 22 (second non-woven fabric area 22a), the edge 40a' will not harden, and the softness of the outer body 2 can be maintained.

FIG. 15B is a schematic enlarged view for explaining an example of the opening 40 and the opening 45. A view showing an example of the relationship between the sizes of the opening 40 and the opening 45. If the aperture diameter of one opening 40' in the opening 40 is set to 40adi, and the aperture diameter of one opening 45' in the plurality of openings 45 provided on the second non-woven fabric 22 (second non-woven fabric region 22a) is set to 45adi, it is ideal that the aperture diameter 40adi is larger than the aperture diameter 45adi. In the present example, when the aperture diameters 40adi and 45adi are viewed from above, if the edge of the lower aperture (the edge of the aperture 45' in FIG. 15B) is visible, the aperture diameter of the upper aperture (opening 40') is larger, and if it is not visible, the aperture diameter of the upper aperture (40') is smaller. Furthermore, when viewed from above, it is ideal that the opening 45' is located inside the opening 40'. Thus, the air permeability of the outer body 2 is improved in the portion where the opening 40' and the opening 45' overlap. Furthermore, when viewed from above, a shadow is formed in the portion where the openings 40' and 45' overlap, thereby improving the visibility of the opening.

C10: roughly the center in the longitudinal direction

1: Absorbent articles

2:External body

10: Absorbent body

20: Abdominal waist circumference

21: No. 1 nonwoven fabric

21a: 1st nonwoven fabric area

22: Second nonwoven fabric

22a: Second non-woven fabric area

23: Filamentous elastic component

24: Covered with non-woven fabric

30: Back waist area

31: No. 1 nonwoven fabric

31a: 1st nonwoven fabric area

32a: Second non-woven fabric area

32: Second nonwoven fabric

33: Filamentous elastic component

34: Covered with non-woven fabric

40: Opening

Claims (12)

An absorbent article has a longitudinal direction, a left-right direction and a thickness direction that intersect each other in an unfolded state, and has: an absorbent body for absorbing liquid; and an outer body, which includes: a first non-woven fabric area having a plurality of openings, and a second non-woven fabric area, wherein the absorbent article is characterized in that: the first non-woven fabric area is arranged on the skin-most side or the non-skin-most side in the thickness direction, the second non-woven fabric area overlaps the first non-woven fabric area in the thickness direction, the weight per unit area of the first non-woven fabric area is greater than the weight per unit area of the second non-woven fabric area, and the second non-woven fabric area is not There is a region with openings, and on one of the two surfaces of the first non-woven fabric region, there is a fiber protrusion in which the fibers protrude in the thickness direction at the edge adjacent to one of the plurality of openings, and the surface on which the fiber protrusion exists faces the second non-woven fabric region, and the first non-woven fabric region and the second non-woven fabric region are joined by a hot melt adhesive, and when the one opening is used as the first hole and an opening different from the one opening is used as the second hole, the hot melt adhesive application region has a region continuous from the edge of the first hole to the edge of the second hole when viewed in the thickness direction. An absorbent article as recited in claim 1, wherein white pigment is added to the fibers constituting the edge adjacent to one of the plurality of openings in the first non-woven fabric region. An absorbent article as described in claim 1 or claim 2, wherein the color of the first non-woven fabric area is different from the color of the second non-woven fabric area. An absorbent article as recited in claim 1, wherein the thickness of the first non-woven fabric area is thicker than the thickness of the second non-woven fabric area. The absorbent article as recited in claim 1, wherein the surface of the one side where the fiber protrusion exists is joined to the second non-woven fabric area. The absorbent article as recited in claim 1, wherein the outer cover is provided at the abdominal waist portion located at one end of the absorbent body in the longitudinal direction, or at the back waist portion located at the other end of the absorbent body in the longitudinal direction. The absorbent article as recited in claim 1, wherein the second non-woven fabric area is composed of a spunbond non-woven fabric. An absorbent article as recited in claim 1, wherein at least a portion of the edge adjacent to one of the plurality of openings has a molten portion. The absorbent article as described in claim 1, wherein, when one of the plurality of openings is used as the first opening and an opening different from the one opening is used as the second opening, the first opening has an area overlapping with the heat-melting adhesive, and the second hole has only an area not overlapping with the heat-melting adhesive. The absorbent article as recited in claim 9, wherein the first hole has an area overlapping with the thermal adhesive and an area not overlapping with the thermal adhesive. The absorbent article as recited in claim 1, wherein the first non-woven fabric area and the second non-woven fabric area have an overlapping area overlapping each other in the thickness direction, and at one end or the other end of the overlapping area in the longitudinal direction, the first non-woven fabric area and the second non-woven fabric area have a non-joined portion that is not joined by a thermal adhesive. An absorbent article has a longitudinal direction, a left-right direction and a thickness direction that intersect each other in an unfolded state, and has: an absorbent body for absorbing liquid; and an outer body, which includes: a first non-woven fabric area having a plurality of openings, and a second non-woven fabric area. The absorbent article is characterized in that: the first non-woven fabric area is arranged on the skin-most side or the non-skin-most side in the thickness direction, the second non-woven fabric area overlaps the first non-woven fabric area in the thickness direction, the weight per unit area of the first non-woven fabric area is greater than the weight per unit area of the second non-woven fabric area, and the second non-woven fabric area has a plurality of openings. At least a portion of one of the plurality of openings in the first non-woven fabric region overlaps with a non-opening region without openings in the second non-woven fabric region, the aperture of the one opening is larger than the aperture of the opening formed in the second non-woven fabric region, and the one opening formed in the second non-woven fabric region is located on the inner side of the one opening when viewed from above.

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