TW201707664A - Absorbent article - Google Patents

Abstract

An absorbent article (1) is provided with a front surface sheet (2), a back surface sheet (3), and an absorbent body (4) interposed between these two sheets (2, 3). The absorbent article (1) has a second sheet (9) between the front surface sheet (2) and the absorbent body (4). The front surface sheet (2) has a textured structure having skin-side protrusions (21), which protrude on the skin-facing surface side and have interior spaces (S1), and non-skin-side protrusions (22), which protrude on the non-skin-facing surface side and have interior spaces (S2). Viewing the front surface sheet (2) in cross-section, the fiber basis weight of wall sections (21W) is greater than the fiber basis weight of the top sections (21T) of the skin-side protrusions (21) and the top sections (22T) of the non-skin-side protrusions (22). The absorbent body (4) is formed from a layered body of absorbent sheets and has slits (43). The slits (43) penetrate one layer of the layered body.

Description

Absorbent article

The present invention relates to an absorbent article such as menstrual napkin.

The applicant of the present application has previously proposed an absorbent article in which a front sheet is disposed directly above the absorbent body, a plurality of slits are disposed under the front sheet, and a plurality of solid portions are disposed on the upper layer of the front sheet. (Refer to Patent Document 1). Moreover, the applicant of the present invention has previously proposed an absorbent article in which a plurality of longitudinal slits are provided in the absorbent body, and a concave sheet-shaped concave portion is formed by crimping the constituent fibers on the front sheet disposed above the absorbent body. Further, a block-shaped convex portion is formed (refer to Patent Document 2).

Unlike the above-mentioned absorbent article, Patent Document 3 discloses an absorbent article comprising a front sheet directly above the absorbent body, and a plurality of convex portions are provided on the front sheet, and the front sheet is provided on the front sheet. The convex portion and the absorber have a hollow structure.

Prior technical literature Patent literature

Patent Document 1: Japanese Patent Laid-Open Publication No. 2005-319043

Patent Document 2: Japanese Patent Laid-Open No. 2015-024002

Patent Document 3: Japanese Patent Laid-Open Publication No. 2009-268559

The present invention relates to an absorbent article comprising a front sheet which forms a liquid permeability to the skin facing surface, a back sheet which forms a non-skin opposing surface, and an absorbent body interposed between the two sheets. And having an absorbent body having: when worn The excretion portion facing portion disposed opposite to the excretion portion of the wearer, the front portion of the abdomen portion that is disposed closer to the wearer than the excretion portion, and the wearer portion that is disposed closer to the excretion portion The rear side of the back side, and the absorbent article has a longitudinal direction corresponding to the front and rear directions of the wearer and a transverse direction orthogonal to the longitudinal direction. A second sheet made of a non-woven fabric is disposed between the front sheet and the absorbent body. The front sheet has a plurality of skin-side protruding portions that protrude toward the skin facing surface side and have an internal space, and a plurality of non-skin-side protruding portions that protrude toward the non-skin opposing surface side and have an internal space. Sheet. The excretory portion facing portion includes a hollow portion having a hollow structure between the skin-side protruding portion and the second sheet, and a non-pressure-bonding portion in which the non-skin-side protruding portion and the absorbent body are not pressure-bonded. When the front sheet is observed in a cross section, the fiber unit area of the wall portion between the top of the skin-side protruding portion and the top portion of the non-skin-side protruding portion is higher than the fiber unit area of the top portion of the skin-side protruding portion and the non-weight The fiber unit area at the top of the skin side projection is heavy. The absorption system is formed of a laminate of an absorbent sheet, and has a plurality of slits in the opposing portion of the excretion portion. The slit penetrates at least one layer of the laminate.

1‧‧‧Sanitary cotton

2‧‧‧Front sheet

3‧‧‧Back sheet

4‧‧‧Acceptor

4S‧‧‧Drain section slit area

5‧‧‧Side sheet

8‧‧‧Linear extrusion tank

9‧‧‧Second sheet

10‧‧‧Absorbable ontology

10S‧‧‧Flanking

10W‧‧‧wings

21‧‧‧Skin side protrusion

21H‧‧‧ Opening of internal space S1

21T‧‧‧ top of the skin side protrusion

21W‧‧‧The wall of the skin-side projection

22‧‧‧ Non-skin side projections

22H‧‧‧ Opening of internal space S2

22T‧‧‧Top of the non-skin side projection

22W‧‧‧The wall of the non-skin side projection

23‧‧‧through hole

24‧‧‧Skin side protrusion

25‧‧‧Non-skin side projections

40‧‧‧Main absorber

41‧‧‧Assistant absorber

42‧‧‧Multi-layer

43‧‧‧Slit

61‧‧‧1st bonding wire

62‧‧‧2nd bonding wire

71‧‧‧of the wing joint

72‧‧‧ body adhesion

81‧‧‧1st horizontal extrusion slot

82‧‧‧Squeezing slot

83‧‧‧2nd horizontal extrusion slot

200‧‧‧Front sheet

201‧‧‧ recess

202‧‧‧Division area

411‧‧‧Absorbable sheet

412‧‧‧Absorbable sheet

413‧‧‧Absorbable sheet

A‧‧‧ front section

B‧‧‧Excretion Department

C‧‧‧ Rear

L‧‧‧ vertical

L1‧‧‧ overlapping length

Length of L2‧‧‧ longitudinal slit

L21‧‧‧Top 21T, 21T are separated from each other

L43‧‧‧ longitudinal slits are separated from each other

P‧‧‧Space Department

R1‧‧‧ slit line

R2‧‧‧ slit line

S1‧‧‧ interior space

S2‧‧‧ interior space

S3‧‧‧Internal space

S4‧‧‧Internal space

T _L1 ‧‧‧Top 21T layer thickness

T _L2 ‧‧‧layer thickness of top 22T

T _L3 ‧‧‧ layer thickness of 21W wall

T _s ‧‧‧Sheet thickness

W43‧‧‧Width of the longitudinal slit

X‧‧‧ portrait

Y‧‧‧ horizontal

Fig. 1 is a plan view showing a skin facing surface side (front sheet side) of a menstrual sanitary napkin according to a preferred embodiment of the absorbent article of the present invention.

Fig. 2 is a cross-sectional view schematically showing a cross section taken along line II-II of Fig. 1.

Fig. 3 is an enlarged perspective view showing the main part of the front sheet provided in the menstrual napkin shown in Fig. 1.

Fig. 4 is a cross-sectional view showing the main part of the front sheet shown in Fig. 3 in an enlarged mode.

Fig. 5 is a plan view showing an absorbent body provided in the menstrual sanitary napkin shown in Fig. 1.

6(a) to 6(b) are partially enlarged plan views showing a preferred arrangement of the slits in the slit portion of the excretion portion of the absorbent body shown in Fig. 5.

Fig. 7 is an enlarged perspective view showing a main part of a front sheet according to another embodiment of the absorbent article of the present invention.

Fig. 8 is an enlarged perspective view showing a main part of a front sheet provided in the menstrual napkin of Comparative Example 1.

Since the absorbent article described in Patent Document 1 has a plurality of slits in the lower layer of the front sheet, the excreted body fluid can be quickly absorbed and quickly transferred to the absorbent body located thereunder. Further, since the absorbent article described in Patent Document 2 is provided with a plurality of longitudinal slits in the absorbent body, the front sheet is less likely to wrinkle, and the excreted body fluid can be quickly absorbed into the absorbent body. However, there is a need to suppress the diffusion of the exuded body fluid on the surface of the front sheet and to suppress the backflow of the liquid absorbed into the body fluid of the absorber.

Since the absorbent article described in Patent Document 3 has a hollow structure between the convex portion of the front sheet and the absorbent body, it is possible to suppress backflow of the liquid absorbed into the body fluid of the absorbent body. However, in Patent Document 3, there is no description of a configuration for rapidly absorbing the excreted body fluid and suppressing the diffusion of the excreted body fluid on the surface of the front sheet.

Accordingly, it is an object of the present invention to provide an absorbent article which can eliminate the disadvantages of the prior art described above.

Hereinafter, the menstrual sanitary napkin 1 (hereinafter also referred to as "sanitary cotton 1") according to an embodiment of the preferred embodiment of the absorbent article of the present invention will be described with reference to the drawings. Fig. 1 is a plan view showing the sanitary napkin 1 of the present embodiment viewed from the side of the front sheet, and Fig. 2 is a cross-sectional view showing the sanitary napkin 1 of the present embodiment. As shown in FIGS. 1 and 2, the sanitary napkin 1 has an absorbent main body 10 having a front sheet 2 which forms a liquid permeability to the skin facing surface, and a back sheet 3 which forms a non-skin opposing surface. And an absorber 4 interposed between the two sheets 2 and 3. Further, the sanitary napkin 1 is provided with a second sheet 9 made of a non-woven fabric between the front sheet 2 and the absorbent body 4. The second sheet 9 is a sheet different from the front sheet 2 and the absorbent body 4, and is also referred to in the art as a sublayer sheet. The second sheet 9 serves to enhance the permeability of the liquid from the top sheet 2 to the absorbent body 4 or to reduce the liquid backflow of the liquid absorbed into the absorbent body 4 to the front sheet 2.

As shown in Fig. 1, the absorbent body 10 of the sanitary napkin 1 has a discharge portion facing portion B that is disposed opposite to a wearer's excretion portion (vaginal opening or the like) when worn, and is disposed closer to the excretory portion opposing portion B. The front portion A of the front side (front side) of the wearer and the rear side B of the rear side (rear side) of the wearer are disposed closer to the side of the wearer. The sanitary napkin 1 and the absorbent body 10 have a longitudinal direction X corresponding to the front and rear directions of the wearer and a transverse direction Y orthogonal to the longitudinal direction X. That is, the absorbent main body 10 is sequentially divided into the front portion A, the excretion portion opposing portion B, and the rear portion C in the longitudinal direction X.

Further, in the present specification, the skin facing sanitary napkin 1 or a constituent member thereof (for example, the absorbent main body 10) faces the skin side of the wearer when the sanitary napkin 1 is worn, and the non-skin opposing surface system The sanitary napkin 1 or its constituent members face the side opposite to the skin side (cloth side) when the sanitary napkin 1 is worn. Further, the longitudinal direction X coincides with the longitudinal direction of the sanitary napkin 1 and the absorbent body 10, and the lateral direction Y coincides with the width direction of the sanitary napkin 1 and the absorbent body 10 (the direction orthogonal to the longitudinal direction).

In the present embodiment, as shown in FIGS. 1 and 2, the sanitary napkin 1 has the absorbent body 10, and further has two sides extending in the longitudinal direction X of the opposing portion B of the excretory portion of the self-absorbent body 10, respectively. A pair of wing portions 10W, 10W extending toward the outer side of the lateral direction Y.

Further, in the absorbent article of the present invention, when the sanitary napkin 1 of the present embodiment has the wing portion 10W, the excretion portion opposing portion B means the longitudinal direction of the absorbent article (absorbent article) The length direction, in the X direction in the drawing), has a region of the wing portion 10W (a region sandwiched between a root portion of one wing portion 10W extending in the longitudinal direction X and a root portion of the other wing portion 10W extending in the longitudinal direction X). In the absorbent article having no wing portion, the opposite portion of the excretion portion means a lateral direction (the width direction of the absorbent article, the Y direction in the drawing) which is generated when the absorbent article is folded into a single package form of three folds. In the two bending lines (not shown) of the absorbent article, the area surrounded by the first bending line and the second bending line is from the front end in the longitudinal direction X of the absorbent article.

In the sanitary napkin 1, as shown in FIG. 2, the front sheet 2 covers the skin of the absorbent body 4 The entire area of the face, and the side edges of the self-absorbent body 4 extending in the longitudinal direction X extend toward the outer side of the lateral direction Y. On the other hand, the back sheet 3 covers the entire area of the non-skin opposing surface of the absorbent body 4, and further extends from the both side edges of the absorbent body 4 extending in the longitudinal direction X toward the outer side of the lateral direction Y, and the side sheets described below. The materials 5 collectively form the side flaps 10S. The back sheet 3 and the side sheet 5 are extended from the both side edges of the self-absorbent body 4 extending in the longitudinal direction X, and are joined to each other by a known joining method such as an adhesive, heat sealing, or ultrasonic sealing. .

In the sanitary napkin 1, as shown in FIGS. 1 and 2, the side sheet 5 is disposed in the longitudinal direction X of the skin facing surface of the absorbent body 10 (the skin facing surface of the front sheet 2). Both sides. It is preferable that the side sheet 5 is disposed over the entire length X of the absorbent body 10 so as to overlap the left and right side portions of the absorbent body 4 extending in the longitudinal direction X in plan view.

In the sanitary napkin 1, as shown in FIG. 1, the pair of side sheets 5 and 5 are respectively provided by the first bonding wire 61 which is linear in the opposing portion B of the drain portion, and the first bonding wire 61. The linear second bonding wire 62 is formed in the longitudinal direction X (front portion A and rear portion C) to be bonded to the front sheet 2. The first bonding wire 61 has a curved shape that protrudes toward the outer side in the lateral direction Y in a plan view, and the second bonding wire 62 has a linear shape (saw-tooth shape) extending in a vertical direction so as to alternately in a plan view. As described above, when the side sheet 5 is joined to the front sheet 2 by the first bonding wire 61 and the second bonding wire 62 and is fixed to the skin facing surface of the absorbent body 10, as shown in FIG. The space portion P which is formed by the side sheet 5 and the front sheet 2 is formed on the inner side of the lateral direction Y from the first bonding wire 61 and the second bonding wire 62. Since the space portion P is opened toward the center of the lateral direction Y of the absorbent body 10, body fluid such as menstrual blood flowing from the center of the lateral direction Y to the outside is accommodated in the space portion P, and as a result, leakage of the body fluid can be effectively prevented.

In the sanitary napkin 1, as shown in Fig. 1, the side flap portion 10S largely protrudes toward the outer side of the lateral direction Y of the excretory portion opposing portion B, whereby the left and right sides of the absorbent body 10 extending in the longitudinal direction X are extended. A pair of wing portions 10W, 10W are provided. Further, as shown in FIG. 1, the front sheet 2 and the back sheet 3 are respectively extended from the front end and the rear end of the longitudinal direction X of the absorber 4 to the outer side of the longitudinal direction X, and the adhesive portion is adhered to the extension portions. Known joints such as heat sealing, ultrasonic sealing, etc. The methods are joined to each other to form an end seal.

The wing portion 10W is folded back to the non-skin opposing side of the crotch portion of the garment such as a pair of shorts and the user. In the sanitary napkin 1, as shown in FIG. 1, the wing portion 10W has a lower trapezoidal shape (longer than the upper base) in a substantially trapezoidal shape on the side of the side of the absorbent body 10 extending in the longitudinal direction X in plan view. As shown in Fig. 2, a wing-shaped adhesive portion 71 for fixing the wing portion 10W (sanitary napkin 1) to clothes (not shown) such as shorts is formed on the non-skin opposing surface of the wing portion 10W. In use, the wing portion 10W that is folded back to the non-skin opposing surface (outer surface) side of the crotch portion of the garment can be adhered and fixed to the crotch portion by the wing portion adhesive portion 71. Moreover, as shown in FIG. 2, the non-skin opposing surface of the absorbent main body 10 is also formed with the main body adhesion part 72 (anti-offset part) which fixes the absorptive main body 10 to the clothing, such as a shorts.

In the sanitary napkin 1, as shown in Figs. 1 and 2, the skin facing surface (the skin facing surface of the front sheet 2) of the absorbent body 10 is formed with the front sheet 2 and the second sheet 9 oriented. A linear extrusion groove 8 formed by integrally recessing the back sheet 3 side. The "linear shape" in the linear squeeze groove 8 means that the shape of the groove (recessed portion) is not limited to a straight line in plan view, and includes a curved line. Furthermore, each line may be a continuous line or a discontinuous line such as a broken line. For example, the linear extrusion groove 8 may also comprise a row of discrete points of embossing. The linear pressing groove 8 has a first horizontal pressing groove 81 extending in the lateral direction Y and a longitudinal pressing groove extending in the longitudinal direction X on both side portions of the opposing portion B of the drain portion, respectively, at the front portion A and the rear portion C. 82. In the sanitary napkin 1, the first lateral pressing groove 81 of the front portion A and the rear portion C has a curved shape that protrudes outward in the longitudinal direction X, and each of the vertical pressing grooves 82 has a curved shape that protrudes toward the inner side in the lateral direction Y. In the sanitary napkin 1, the first lateral pressing groove 81 of the front portion A, one vertical pressing groove 82, the first horizontal pressing groove 81 of the rear portion C, and the other longitudinal pressing groove 82 are connected to form a ring shape. The whole week slot. Further, in the sanitary napkin 1, the linear pressing groove 8 has a longitudinal direction X inside the first lateral pressing groove 81 of the front portion A and the rear portion C, and has a second horizontal pressing groove extending in the lateral direction Y, respectively. 83, 83. In the sanitary napkin 1, the second lateral pressing grooves 83 and 83 of the front portion A and the rear portion C have a curved shape that protrudes outward in the longitudinal direction X. Further, as shown in FIG. 1, the second lateral pressing grooves 83, 83 of the sanitary napkin 1 are not connected to the pair of longitudinal pressing grooves 82, 82, But they can also be connected. The linear pressing groove 8 thus formed can suppress the diffusion of the body fluid in the planar direction of the absorbent body 4, thereby effectively preventing the liquid from leaking from the periphery of the sanitary napkin 1.

The front sheet 2 of the sanitary napkin 1 is described in detail. As shown in FIG. 3 and FIG. 4, the front sheet 2 has a plurality of skin-side projections 21 that protrude toward the skin facing surface side and have an internal space S1, and A sheet of a concavo-convex structure that protrudes toward the non-skin opposing side and has a plurality of non-skin side projections 22 of the internal space S2. Preferably, when the front sheet 2 is viewed in a plan view, the skin-side protruding portion 21 and the non-skin-side protruding portion 22 are alternately arranged alternately in two different directions intersecting each other. Here, the two different directions are preferably such that any one of the first directions in the plane and the second direction intersecting therewith intersect at an angle of 30 degrees or more and 90 degrees or less, for example, at 90 degrees in the sanitary napkin 1. That is, for example, in the sanitary napkin 1, one of the two directions is the lateral direction Y, and the other of the two directions is the longitudinal direction X. Therefore, when the front sheet 2 is viewed in a plan view, the skin-side protruding portion 21 and the non-skin-side protruding portion 22 are alternately arranged alternately in the longitudinal direction X and the lateral direction Y. Further, in the embodiment shown in FIG. 4, the convex portion viewed from the skin facing surface side is the skin side protruding portion 21, and the concave portion is the non-skin side protruding portion 22. Conversely, the convex portion viewed from the non-skin opposing side is the non-skin side protruding portion 22, and the concave portion is the skin side protruding portion 21. Therefore, the skin side protrusion 21 and the non-skin side protrusion 22 share a part. The shared portion means the wall portion 21W having the following annular structure and the wall portion 22W having the following annular structure.

In the sanitary napkin 1, as shown in FIGS. 3 and 4, the front side sheet 2 has a wall portion 21W having an annular structure between the top portion 21T and the opening portion 21H of the internal space S1. Further, the non-skin side protruding portion 22 has a wall portion 22W having an annular structure between the top portion 22T and the opening portion 22H of the internal space S2. In the sanitary napkin 1, the skin-side projection 21 and the non-skin-side projection 22 have a truncated cone shape or a hemispherical shape in which the top portion 21T and the top portion 22T have a curvature. The fibers of the top portion 22T of the plurality of non-skin side projections 22 have a basis weight lower than the surrounding portion thereof, and may have a through hole 23. In the embodiment shown in FIGS. 3 and 4, the non-skin side projection 22 has a through hole 23 penetrating the top portion 22T. When the non-skin side protrusion 22 has the through hole 23, the top 22T of the plurality of non-skin side protrusions 22 may be A portion has a through hole 23, and all of the top portions 22T of the plurality of non-skin side projections 22 have through holes 23. Further, the front sheet 2 may have a non-skin side protruding portion 22 having a top portion 22T having a through hole 23 penetrating therethrough, and a top portion having no through hole 23 and having a reduced unit area of the fiber. Both of 22T.

When the skin-side protruding portion 21 and the non-skin-side protruding portion 22 of the front sheet of the sanitary napkin 1 are observed in more detail, the protruding shape of the skin-side protruding portion 21 is hemispherical, and on the other hand, the non-skin side protruding portion The protruding shape of 22 becomes a conical or truncated cone shape having a curvature at the top. Further, the protruding shape of the skin-side protruding portion 21 and the non-skin-side protruding portion 22 is not limited to the above shape, and may be any protruding shape. For example, it may be a cone shape such as a cone, a truncated cone, a pyramid, a truncated cone, or a tapered cone. In the sanitary napkin 1, the skin-side projection 21 and the non-skin-side projection 22 hold the truncated cone shape or the hemispherical internal space S1 and the internal space S2 which are similar in outer diameter to the outer diameter.

When the front sheet 2 is viewed from the skin facing side, the wall portion 21W of the skin-side protruding portion 21 has an annular structure centering on the top portion 21T of the skin-side protruding portion 21. Moreover, when the front sheet 2 is viewed from the non-skin opposing surface side, the wall portion 22W of the non-skin side protruding portion 22 has an annular structure centering on the top portion 22T of the non-skin side protruding portion 22. Further, as shown in FIG. 4, the wall portion 21W of the skin-side protruding portion 21 and the wall portion 22W of the non-skin-side protruding portion 22 share the same portion. Here, the "annular shape" is not particularly limited as long as it is a ring-shaped shape when the front sheet 2 is viewed in a plan view, and may be circular, elliptical, rectangular, polygonal, or the like when the front sheet 2 is viewed in plan. Any shape. From the viewpoint of preferably maintaining the continuous state of the front sheet 2, a circular or elliptical annular configuration is preferred. Further, the "ring" is regarded as a three-dimensional shape, and examples thereof include a columnar shape, an oblique column shape, an elliptical column shape, a truncated cone shape, a truncated cone shape, a truncated cone shape, and a truncated cone shape. The arbitrary ring structure such as a truncated oblique quadrangular pyramid shape is preferably a columnar shape, an elliptical column shape, a truncated cone shape, or a truncated cone shape from the viewpoint of realizing a continuous sheet state.

The skin side protrusion 21 and the non-skin side protrusion 22 provided as described above are positive The sheet 2 is formed by a curved surface that is continuous without a curved portion. Thus, it is preferable that the front sheet 2 has a structure that is continuous in the planar direction. Here, "continuous" means that there is no discontinuous portion or a small hole formed outside the through hole 23 of the top portion 22T of the non-skin side projection portion 22. However, micropores such as the gap between fibers are not included in the above-mentioned small holes. The above-mentioned small hole including the through hole 23 can be defined, for example, such that its aperture is 1.0 mm or more in terms of the diameter of the circle.

In the sanitary napkin 1, the front sheet 2 has a different weight per unit area of fibers constituting the fibers in the thickness direction thereof. Here, the basis weight of the fibers means the amount of fibers per unit area of the front sheet 2, that is, the number of the fibers. The weight per unit area of the fiber means that the amount of fibers per unit area of the front sheet 2 is large, and the distance between the fibers is small. The lower basis weight of the fiber means that the amount of fibers per unit area of the front sheet 2 is small, and the distance between the fibers is large. That is, it means that the capillary force of the portion where the fiber unit area is high is high, and the capillary force at the portion where the fiber unit area is low is low.

As shown in Fig. 4, in the sanitary napkin 1, when the front sheet 2 is viewed in section, the fiber unit area of the wall portions 21W, 22W between the top portion 21T of the skin-side projection portion 21 and the top portion 22T of the non-skin side projection portion 22 is shown. The fiber unit area of the top portion 21T which is heavier than the skin side projection 21 and the fiber unit area of the top portion 22T of the non-skin side projection 22 are heavier. Preferably, in the sanitary napkin 1, the fiber unit area of the wall portion 21W (the wall portion 22W of the non-skin side projection portion 22) of the skin-side projection portion 21 is higher than the top portion 21T of the skin-side projection portion 21 and the non-skin side projection. The fiber unit area of both the top 22T of the portion 22 is heavy. In particular, in the sanitary napkin 1, the fiber unit area is increased in the order of the top portion 22T < the top portion 21T of the skin-side protruding portion 21 < the wall portion 21W of the skin-side protruding portion 21 (the wall portion 22W of the non-skin-side protruding portion 22). . Therefore, regarding the capillary force, the capillary force also becomes higher in the order of the top portion 22T < the top portion 21T of the skin-side protruding portion 21 < the wall portion 21W of the skin-side protruding portion 21 (the wall portion 22W of the non-skin-side protruding portion 22). In this case, the fiber unit area weight and the capillary force may be the top portion 22T<the top portion 21T of the skin side protrusion portion 21<the wall portion 21W of the skin side protrusion portion 21 (the wall portion of the non-skin side protrusion portion 22) The order of 22W) is continuously increased gradually, or may be stepwisely increased stepwise. As a result, the capillary force difference generated by the change in the density of the skin-side protruding portion 21 to the non-skin-side protruding portion 22 of the front sheet 2 can easily cause the excretion of menstrual blood and the like absorbed from the skin side of the front sheet 2 To the non-skin side, thereby reducing the amount of excretion or liquid backflow on the skin side of the front sheet 2. Further, since the weight per unit area of the fiber of the top portion 22T is low, the excretion liquid is easily transferred to the absorbent body 4, so that the absorption speed of the excretory liquid is increased.

As described below, the value of the fiber unit area weight of the front sheet 2 is expressed by converting the number of fibers in the field of view of the measurement site into a value per unit area. The weight per unit area of the fiber is preferably 2/mm ² or more, particularly preferably 10 pieces/mm ² or more, and preferably 100 pieces/mm ² for the top portion 22T of the non-skin side protrusion portion 22. In particular, it is preferably 80 pieces/mm ² or less, and specifically, preferably 2 pieces/mm ² or more and 100 pieces/mm ² or less, and more preferably 10 pieces/mm ² or more and 80 pieces/mm ^{2 .} the following. Further, the top portion 21T of the skin-side protruding portion 21 is preferably 30 pieces/mm ² or more, particularly preferably 50 pieces/mm ² or more, and preferably 130 pieces/mm ² or less, and particularly preferably 120 pieces/mm ² or less, specifically, it is preferably 30 pieces/mm ² or more and 130 pieces/mm ² or less, and more preferably 50 pieces/mm ² or more and 120 pieces/mm ² or less. Further, the wall portion 21W of the skin-side protruding portion 21 (the wall portion 22W of the non-skin-side protruding portion 22) is preferably 30 pieces/mm ² or more, and particularly preferably 50 pieces/mm ² or more, and more preferably It is preferably 200 pieces/mm ² or less, particularly preferably 150 pieces/mm ² or less, and specifically, preferably 30 pieces/mm ² or more and 200 pieces/mm ² or less, and more preferably 50 pieces/mm ^{2 .} The above is 150 pieces/mm ² or less. The fiber unit area of the top portion 21T of the skin-side projection 21 is measured at a position near the center of the layer thickness T _L1 of the top portion 21T. The fiber unit area of the top portion 22T of the non-skin side projection 22 is measured at a position near the center of the layer thickness T _L2 of the top portion 22T. The fiber unit area of the wall portion 21W (the wall portion 22W of the non-skin side projection portion 22) of the skin side protrusion portion 21 is located near the center of the layer thickness T _L3 of the wall portion 21W near the middle of the sheet thickness T _s . The overall thickness was measured. The method for measuring the weight per unit area of the fiber is as follows.

<Method for measuring the weight per unit area>

Use a scanning electron microscope to magnify the cut surface of the front sheet 2 (adjusted to measure the magnification of the fiber cross section of about 30 to 60; 150 to 500 times), and count by each fixed area (0.5 mm ^{2 )} The number of sections of the fiber cut by the cut surface of the left and right sides. Next, the number of sections per 1 mm ² of the fiber is converted into a fiber basis weight. The measurement was carried out at three sites, and the average was taken as the fiber unit area weight of the sample.

‧Scanning Electron Microscope: JCM-5100 (trade name) manufactured by JEOL Ltd.

Further, even if the skin-side projection 21 is crushed by the body pressure at the time of wearing and the inward pressing force generated by the wearer's thigh, the shape of the projection 21 is restored to the original shape, and the discharged body fluid is discharged. The compression ratio of the front sheet 2 is preferably 40% from the viewpoint of suppressing the diffusion of the excreted body fluid on the surface of the front sheet 2 and suppressing the liquid reflux of the body fluid absorbed into the absorber 4, from the viewpoint of rapid absorption into the absorbent body. The above is particularly preferably 60% or more, and preferably 95% or less, particularly preferably 90% or less, and specifically, preferably 40% or more and 95% or less, and more preferably 60% or more and 90%. %the following. The compression ratio of the front sheet 2 can be measured using a KES compression tester. The larger the value measured by the KES compression tester, the more excellent the cushioning property was evaluated. The compression ratio of the front sheet 2 measured by the KES compression tester is based on the "Standardization and Analysis of Texture Evaluation (Second Edition)" [Kawabata Hiroshi, Corporate Finance, Japan Society of Fiber Machinery, Institute of Texture Measurement and Normalization) Issued (July 10, 1980)] is based on the physical properties of the compressive properties of the cloth. The method of measuring the compression ratio of the front sheet 2 by a KES compression tester is as follows.

<Method for measuring compression ratio>

As the measuring device, a KES-FB3 compression tester manufactured by Kato Tech Co., Ltd. was used. Using this tester, the thickness T ₀ of the sample (front sheet 2) under a load of 0.5 gf/cm ² was measured at a compression area of 2 cm ² . Next, the sample was compressed at a pressurization speed of 10 μm/sec. The load is increased as it is compressed. The compression was carried out until the load became 50 gf/cm ² . Then, the thickness T _m under a load of 50 gf/cm ² was measured. The value obtained by subtracting the thickness T _{0 from the} thickness T _{m was} divided by the thickness T ₀ and multiplied by 100, whereby the compression ratio (%) of the front sheet 2 measured by a compression tester was calculated. That is, the compression ratio (%) is calculated based on (T ₀ -T _m )/T ₀ ×100.

Moreover, the skin feel is good when the skin-side projection 21 comes into contact with the skin due to the body pressure at the time of wearing and the inward pressing force generated by the wearer's thigh, and the skin-side projection 21 follows the body. From the viewpoint of the operation, the compression energy of the front sheet 2 is preferably 0.98 mN‧ m/cm ² or more, particularly preferably 3.43 mN‧ m/cm ² or more, and preferably 9.8 mN‧m/cm ² Hereinafter, it is particularly preferably 6.86 mN‧m/cm ² or less, and specifically, preferably 0.98 mN‧m/cm ² or more and 9.8 mN‧m/cm ² or less, and further preferably 3.43 mN‧m/cm ² or more and 6.86 mN‧m/cm ² . The compression energy of the front sheet 2 can be measured using a KES compression tester. The larger the WC value measured by the KES compression tester, the more soft the front sheet 2 was evaluated. The method for measuring the compression energy of the front sheet 2 by a KES compression tester is as follows.

<Method for measuring compression energy>

As the measuring device, a KES-G5 small compression tester manufactured by Kato Tech Co., Ltd. was used. Using this tester, a sample (front sheet 2) of 5 cm × 10 cm was prepared and attached to a test stand. Next, the data was compressed between steel plates having a circular plane having an area of 2 cm ² . The compression speed was set to 20 μm/sec, and the maximum compression load was set to 4.9 kPa. The recovery process was also measured at the same speed. The compression energy (WC) of the front sheet 2 is represented by the following formula. T _m , T ₀ and P respectively represent the thickness at the load of 4.9 kPa (50 gf/cm ² ), the thickness at the load of 49 Pa (0.5 gf/cm ² ), and the load at the time of measurement.

Further, regarding the thickness of the front sheet 2, the thickness of the entire sheet 2 when the front sheet 2 is viewed sideways as shown in Fig. 4 is taken as the sheet thickness T _s , and the partial thickness of the front sheet 2 which is bent by the unevenness Set to the layer thickness T _L . The sheet thickness T _s can be appropriately adjusted according to the use, and when it is used as a top sheet for an absorbent article such as a physiological article, it is preferably 1 mm or more and 3.5 mm or less, more preferably 1.2 mm or more and 2.5 mm or less. By setting it as this range, the body fluid absorption speed at the time of use is quick, and it can suppress the recirculation of a liquid self-absorber, and can implement moderate cushioning property.

The layer thickness T _L may be different between the respective portions in the front sheet 2, and may be appropriately adjusted depending on the use. In the case of being used as a front sheet for an absorbent article such as a physiological article, it is preferable that the layer thickness T _L1 of the top portion 21T of the skin-side protruding portion 21 > the wall portion 21W of the skin-side protruding portion 21 (non-skin side projection) The layer thickness T _L3 of the wall portion 22W of 22 is smaller than the layer thickness T _L2 of the top portion 22T of the non-skin side projection portion 22. Thereby, the top portion 21T of the skin-side protruding portion 21, particularly on the opposite side of the skin, has a low fiber unit area, and a good skin feel can be achieved. On the other hand, the wall portion 21W of the skin-side protruding portion 21 (the wall portion 22W of the non-skin-side protruding portion 22) has a high fiber unit area, is not easily crushed, and can be made to have a good cushioning property without deformation. The front sheet 2 is excellent in the absorption speed of the liquid.

The sheet thickness T _s and the layer thickness T _L were measured by the following methods.

The measurement method of the sheet thickness T _s was measured using a thickness measuring device in a state where a load of 0.05 kPa was applied to the front sheet 2 . The thickness gauge was a laser displacement meter manufactured by OMRON. The thickness measurement was performed at 10 points, and the average value of these was calculated to be the thickness. Further, the layer thickness T _L was measured by using a FEATHER razor (model FAS-10, manufactured by FEATHER Safety Razor) to cut the front sheet 2 in the thickness direction. Then, the thickness of each layer was measured by magnifying the cross section of the cut sheet by about 20 times with a digital microscope VHX-900 manufactured by KEYENCE.

The distance between the top portion 21T of the skin-side protruding portion 21 and the top portion 22T of the non-skin-side protruding portion 22 at the closest position when the front sheet 2 is viewed in a plan view can be appropriately adjusted according to the use, and can be used as a top sheet for an absorbent article such as a physiological product. In the case of a material, it is preferably 1 mm or more and 15 mm or less, more preferably 3 mm or more and 10 mm or less. Further, the distance L21 (see FIG. 4) between the top portions 21T and 21T of the skin-side protruding portions 21 adjacent to each other in the lateral direction Y of the front sheet 2 is preferably 2 mm or more and 30 mm or less, more preferably 3 mm or more and 15 mm or less. . Further, the distance between the top portions 21T and 21T of the skin-side protruding portions 21 adjacent to each other in the longitudinal direction X of the front sheet 2 is preferably 2 mm or more and 30 mm or less, more preferably 3 mm or more and 15 mm or less. In addition, the weight per unit area of the front sheet 2 may be appropriately selected according to the use, and when it is used as a top sheet for an absorbent article such as a physiological article, the average value of the entire sheet is preferably 15 g/m ² or more. 50 g/m ² or less, more preferably 20 g/m ² or more and 40 g/m ² or less.

As described above, in the sanitary napkin 1, as shown in FIGS. 1 and 2, the second sheet 9 is disposed between the front sheet 2 and the absorber 4. The second sheet 9 is disposed on the skin facing surface of the absorbent body 4, and covers the entire area of the skin facing surface of the auxiliary absorbent body 41 of the absorbent body 4 as the multilayered portion 42 in the sanitary napkin 1 described below. The both side edges of the auxiliary absorbent body 41 extending in the longitudinal direction X extend toward the outer side of the lateral direction Y. In the sanitary napkin 1, the side edge of the second sheet 9 extending in the longitudinal direction X is located between the side edge of the auxiliary absorbent body 41 extending in the longitudinal direction X and the side edge of the main absorbent body 40 extending in the longitudinal direction X. Further, the front end edge of the longitudinal direction X of the second sheet 9 is located at the rear end edge of the longitudinal direction X of the sanitary napkin 1, and extends over the entire area of the longitudinal direction X of the sanitary napkin 1.

The second sheet 9 preferably contains a hydrophilic nonwoven fabric or a hydrophilic fiber assembly. Examples of the non-woven fabric include hot air non-woven fabric, dot-bonded non-woven fabric, resin-bonded non-woven fabric, spunlace non-woven fabric, and air-laid non-woven fabric. As the fiber constituting the nonwoven fabric, natural fibers, semi-synthetic fibers, and synthetic fibers can be used. Examples of the natural fiber include pulp, cotton, hemp, and the like. Examples of the semisynthetic fiber include a triacetate fiber and a diacetate fiber. Examples of the synthetic fiber include polyethylene, polyethylene terephthalate, polypropylene, and individual fibers of polyvinyl alcohol, and composite fibers containing two or more of these resins. Examples of the conjugate fiber include a core sheath type, a side-by-side type, and an eccentric type.

The basis weight of the second sheet 9 is preferably 10 g/m ² or more and 50 g/m ² or less, and more preferably 15 g/m ² or more and 40 g/m ² or less. Further, the thickness of the second sheet 9 is preferably 0.1 mm or more and 5 mm or less.

In the excretory portion facing portion B, the sanitary napkin 1 includes a hollow portion having a hollow structure between the skin-side protruding portion 21 of the front sheet 2 and the second sheet 9, and a non-skin side protruding portion 22 of the front sheet 2. A non-crimped portion that is not crimped to the absorber 4. Hereinafter, the portion including the hollow portion and the non-pressure-bonding portion in the excretion portion opposing portion B is referred to as a hollow maintaining portion. Specifically, in the portion other than the linear pressing groove 8 in the opposing portion B of the excretion portion of the sanitary napkin 1, the front sheet 2 and the second sheet 9 are not crimped, but are formed on the front sheet 2 A hollow portion having a hollow structure is formed between the skin-side protruding portion 21 and the second sheet 9. Further, in the portion other than the linear pressing groove 8 in the opposing portion B of the excretion portion of the sanitary napkin 1, the front sheet 2 and the second sheet 9 are not crimped, and the non-skin of the front sheet 2 is formed. The non-crimped portion of the side protrusion 22 and the absorber 4 is not crimped. That is, the hollow maintaining portion in the opposing portion B of the excretion portion means a portion other than the linear pressing groove 8 in the opposing portion B of the excretion portion in the sanitary napkin 1. Further, it is preferable that the front sheet 2 and the second sheet 9 are not subjected to thermocompression bonding in the pressure bonding. Here, "thermocompression bonding" is different from heat fusion in which the constituent fibers constituting the front sheet 2 are fixed to each other to form a nonwoven fabric shape, meaning that a heat is applied to the front sheet 2 and the second sheet 9 by pressing The embossing or the like is compressed and recessed, thereby crimping the front sheet 2 and the second sheet 9.

The hollow maintaining portion of the front sheet 2 and the second sheet 9 in the opposing portion B of the excretion portion need not be provided in the entire region of the opposing portion B of the excretory portion, as long as it exists in the center of the lateral direction Y in the opposing portion B of the excretory portion The area is fine. Here, the central area refers to an area located in the center of the portion where the excretion portion facing portion B is equally divided in the lateral direction Y. If a hollow maintaining portion is present in this region, rapid absorption of body fluid is easily achieved.

Further, the hollow maintaining portion may be present in an area of 50% or more with respect to the total area of the opposing portion B of the excretory portion, and preferably may be present in an area of 70% or more. If it is this range, it is easy to maintain the favorable texture by a hollow structure.

In the portion other than the linear pressing groove 8 in the opposing portion B of the excretion portion of the sanitary napkin 1, when the front sheet 2 is viewed in a cross section in one of two different directions intersecting each other, the front sheet 2 is formed. The inside of the hollow structure between the plurality of skin side protrusions 21 and the second sheet 9 The space S1 is connected to each other. Preferably, in the sanitary napkin 1, each of the internal spaces S1 is not separated (not independent), as shown in FIG. 4, for example, when the front sheet 2 is viewed in a lateral Y cross section in one of the two directions, The inner spaces S1, S1 of the plurality of skin-side projections 21 which are obliquely upwardly adjacent between the longitudinal direction X and the lateral direction Y are connected to each other, and the internal spaces S1, S1 are connected to each other in the direction of the plane formed by the longitudinal direction X and the lateral direction Y. .

In the sanitary napkin 1, the absorbent body 4 is formed of a laminate of the absorbent sheets 411 to 413, and has a plurality of slits 43 in the opposing portion B of the excretion portion. Preferably, as shown in FIG. 5, when the absorber 4 is viewed in a plan view, the absorber 4 has a main absorber 40 having a shape in which the absorber 4 is formed, and a smaller absorber than the main absorber 40 disposed in the opposing portion B of the drain portion. The auxiliary absorber 41 is provided.

In the sanitary napkin 1, as shown in FIG. 2, the main absorbent body 40 is a substantially rectangular shape having a curvature of a corner portion in a plan view, and two pieces extending from the front portion A through the excretory portion opposing portion B toward the rear portion C. The absorbent sheets 411, 412 having the same shape and the same size are formed. Moreover, in the sanitary napkin 1, as shown in FIG. 2, the auxiliary absorber 41 is a substantially rectangular shape in planar view, and is arrange|positioned by the discharge part opposing part B. The auxiliary absorbent body 41 is formed by folding one sheet of the absorbent sheet 413 into a two-layer structure, and is disposed between the two sheets of absorbent sheets 411 and 412 constituting the main absorbent body 40. As described above, the sanitary napkin 1 is formed by enclosing the auxiliary absorbent body 41 having the two-layer structure formed of the absorbent sheet 413 by the main absorbent body 40 formed of the two absorbent sheets 411 and 412.

As shown in Fig. 2, the absorbent body 4 formed of the absorbent sheets 411 to 413 has four layers of a main absorbent body 40 having a two-layer structure and an auxiliary absorbent body 41 having a two-layer structure in the excretion portion opposing portion B. The multilayer portion 42 is constructed. Further, the portion other than the multilayer portion 42 of the absorber 4 also has a laminated structure of a two-layer structure formed of the main absorber 40 having a two-layer structure. Here, as shown in FIG. 2, the multilayered portion 42 means a portion in which the number of laminated sheets constituting the absorbent sheet 4 is larger than the portion around the absorbent sheet 4. In the sanitary napkin 1, the thickness of the multi-layered portion 42 is thicker than the portion located around it, and the bulging portion B is formed on the side of the front sheet 2 (the opposite side of the skin of the sanitary napkin 1). . By arranging the auxiliary absorber 41 having a two-layer structure in one portion of the main absorbent body 40, the absorption capacity of a portion of the absorbent body 4 can be easily and efficiently increased. The absorbent sheets may be joined without being joined, or may be joined by a sparsely spread adhesive or the like.

The thickness of the absorbent body 4 of the sanitary napkin 1 in the multilayer portion 42 is preferably 0.7 mm or more, more preferably 1 mm or more, further preferably 5 mm or less, further preferably 4 mm or less, and more specifically, preferably It is 0.7 mm or more and 5 mm or less, More preferably, it is 1 m or more and 4 mm or less. By setting the thickness of the multilayer portion 42 to such a range, it is easy to achieve both a good wearing feeling and a high absorption performance of the excretion portion opposing portion B in which the multilayer portion 42 is formed. In the case where the absorbent article is provided with the airfoil portion as in the sanitary napkin 1 of the present embodiment, wrinkles of the absorbent body 4 in the opposing portion B of the excretory portion are easily suppressed during wearing. Further, the thickness of the portion of the absorber 4 other than the multilayer portion 42 is preferably 0.3 mm or more, more preferably 0.5 mm or more, further preferably 3 mm or less, further preferably 2.5 mm or less, and more specifically, It is preferably 0.3 mm or more and 3 mm or less, and more preferably 0.5 mm or more and 2.5 mm or less. From the viewpoint of higher absorption performance and improvement of followability to the wearer's action, this range is preferred.

Further, in the absorbent body 4 of the sanitary napkin 1, the difference in thickness (step difference) between the intermediate portion 42 and the peripheral portion thereof or the vicinity thereof is preferably 2 mm or less, and more preferably 1.5 mm or less. The purpose of this is to prevent wrinkles from occurring in the vicinity of the boundary between the middle portion 42 and the portion of the peripheral portion where only the main absorber 40 is present in the opposing portion B of the excretory portion. If the step is large, the sanitary napkin 1 may follow the wearer's movement during wearing, and the result is that the gap due to the step is filled, and the result is likely to be wrinkled due to the influence of the step difference. When the step is set within the above range, the effect of suppressing wrinkles in the opposing portion B of the excretion portion is improved. The thickness of each part of the above-mentioned absorber 4 is measured by the following method.

<Method for Measuring Thickness of Absorber>

The absorber as the object to be measured was placed in a horizontal position so as not to be wrinkled or bent, and the thickness under a load of 5 cN/cm ² was measured. The thickness was measured using a dial gauge type thickness gauge (PEACOCK DIAL UPRIGHT GAUGES R5-C (manufactured by OZAKI MFG. CO. LTD.)). In this case, a plate having a circular or square shape (acrylic resin plate having a thickness of about 5 mm) is disposed between the end portion of the thickness gauge and the measurement portion of the object to be measured, and the load is 5 cN/cm ² . Adjust the size of the board.

Further, in the sanitary napkin 1, as shown in FIGS. 1 and 5, each slit 43 is disposed in parallel with the longitudinal direction X. That is, each slit 43 is a longitudinal slit extending in the longitudinal direction X. In the sanitary napkin 1, the slit (long slit) 43 extending in the longitudinal direction X has a drain portion slit region 4S formed in a state of being dispersed in both the longitudinal direction X and the lateral direction Y.

In the sanitary napkin 1, the slit 43 penetrates at least one layer of the laminated body of the absorbent sheets 411 to 413 which form the absorber 4. In the sanitary napkin 1, as shown in Fig. 2, when the absorbent body 4 is observed in the transverse direction Y cross section, the slit (long slit) 43 penetrates not only one layer of the absorbent body 4 having the multi-layered portion 42 having a four-layer structure, but also Through all the layers of the laminate. That is, the slit (long slit) 43 penetrates all the layers of the absorber 4 throughout the thickness direction of the absorber 4. It is preferable that the vertical slits 43 are formed by cutting the slits penetrating the thickness direction of the absorber 4 in the portions other than the multilayer portion 42 and the multilayer portion 42 in the opposing portion B of the excretion portion. As shown in Fig. 5, the excretory portion slit region 4S in which the plurality of vertical slits 43 are disposed extends over not only the excretory portion opposing portion B but also one of the front portion A and the rear portion C. That is, the slit 43 is present at least in the excretion portion opposing portion B, and the region including the slit 43 located in the excretion portion opposing portion B is referred to as a drain portion slit region 4S. Therefore, the excretory portion slit region 4S does not mean a portion in which a slit is formed in the region of the opposing portion B of the excretory portion. Since the slits 43 are formed with a minute space and the excretion liquid from the front sheet 2 is easily introduced, and the cut portion of the slits 43 is slightly compressed during the slit processing, the absorption speed is further increased. Further, by allowing the vertical slits 43 to completely penetrate the absorbent body 4, the liquid reaching the absorbent body 4 easily reaches the non-skin opposing surface side of the absorbent body 4, and can be efficiently absorbed by the absorbent body 4.

In the sanitary napkin 1, as shown in FIG. 1, the lateral length of each of the longitudinal slits 43, that is, the width W43 (refer to FIG. 5) is formed to be narrower than the skin-side projection adjacent to the lateral direction Y in the front sheet 2. The top 21T and 21T of 21 are spaced apart from each other by L21 (see Fig. 4). Further, the interval L21 between the top portions 21T and 21T is formed to be narrower than the vertical slit in the same slit row extending in the lateral direction Y. The slits 43 are spaced apart from each other by L43 (see Fig. 5). Here, the width W43 of the slit means the length of the slit in a direction orthogonal to the extending direction of the slit. Here, the width of the slit refers to the maximum width of the width in the natural state in which the absorbent article is fixed to the crotch portion of the clothing or the like before the body is absorbed, and the width of the absorbent body 4 before the body fluid is absorbed. Specifically, the width W43 of the slit (long slit) 43 when the slits (long slits) 43 are viewed in plan is preferably 0.1 mm or more, more preferably 0.3 mm or more, and further preferably 1 mm or less. Further, it is preferably 0.8 mm or less, more preferably 0.1 mm or more and 1 mm or less, further preferably 0.3 mm or more and 0.8 mm or less.

In order to minimize the position of the bending of the top portion 21T occurring during the wearing operation, the position of the vertical slit 43 is overlapped with the position of the top portion 21T of the skin-side protruding portion 21, and the conformability of the product is maintained and maintained. The degree of goodness of the skin feel of the middle sheet 2, the ratio of the distance L21 (refer to FIG. 4) of the top portions 21T of the skin-side projections 21 to each other with respect to the longitudinal slits 43 (refer to FIG. 5) ((L21) /L43)×100) is preferably 10% or more, more preferably 30% or more, and is preferably 70% or less, further preferably 55% or less, and thus preferably 10% or more and 70% or less. Further, it is preferably 30% or more and 55% or less.

Specifically, in the sanitary napkin 1, the distance L43 (see FIG. 5) between the slits 43 is preferably 3 mm or more, more preferably 7 mm or more, further preferably 20 mm or less, and further preferably 15 mm or less. Further, it is preferably 3 mm or more and 20 mm or less, and more preferably 7 mm or more and 15 mm or less.

In the sanitary napkin 1, the arrangement of the slits in the slit portion 4S of the excretion portion is not particularly limited as long as the slits are arranged to be dispersed in both the longitudinal direction X and the lateral direction Y, as shown in FIG. In the case of a longitudinal slit 43 extending in the longitudinal direction X, it is preferable that the longitudinal line L including the plurality of longitudinal slits 43 arranged along the longitudinal X of the sanitary napkin 1 is formed with a plurality of rows in the lateral direction Y. . Further, in the sanitary napkin 1, it is preferable that the longitudinal slits 43 of the wales L and L adjacent in the lateral direction Y do not coincide with each other in the longitudinal direction X.

In the sanitary napkin 1, as shown in FIG. 5, the drain portion slit region 4S is composed of a plurality of layers. The way of 42 is formed. In the multilayer portion 42, it is preferable to form two or more slit rows including two or more longitudinal slits 43 separated in the lateral direction Y in the longitudinal direction X, and it is preferable to form three or more rows in the longitudinal direction X. It is particularly preferable to form four or more rows. Further, the number of the slits 43 separated by the slits in the lateral direction X is preferably two or more, and more preferably three or more. Preferably, in addition to the slit row included in the multilayer portion 42 in the longitudinal direction X of the drain portion slit region 4S, the plurality of layer portions 42 further have a front side or a rear side or a front side and a rear side of the longitudinal layer X. Line or more than 2 rows of slit lines.

A preferred arrangement example of the slits 43 in the drain portion slit region 4S is shown in FIG. In the arrangement shown in the figures, the slit rows R1, R2 of the plurality of longitudinal slits 43 separated in the transverse direction Y of the sanitary napkin 1 are alternately formed with a plurality of rows in the longitudinal direction X of the sanitary napkin 1. In the arrangement example shown in FIG. 6, the slit row R1 including the two vertical slits 43 separated in the lateral direction Y and the slit row R2 including the three vertical slits 43 separated in the lateral direction Y are attached to The longitudinal direction X is alternately formed.

In a preferred arrangement example of the slits 43 shown in FIG. 6, as shown in FIGS. 6(a) and 6(b), regarding the two slit rows R1, R2 adjacent in the longitudinal direction X The vertical slits 43 and the slits 43 of the slit row R1 are disposed at the central portion between the slits R2 and the longitudinal slits 43 and 43 adjacent to each other in the lateral direction Y. Further, there is no space between the slit rows R1, R2 adjacent to the longitudinal direction X of the sanitary napkin 1. That is, no space is provided between the two slit rows R1 and R2 adjacent in the longitudinal direction X. The difference between the adjacent slit rows without the interval includes the positions where the end portions of the slit slits R1 and R2 adjacent to each other are adjacent to each other as shown in FIG. 6(a), and FIG. 6 ( b) The case where the ends of the longitudinal slits 43 of the adjacent slit rows R1, R2 overlap each other in the longitudinal direction X. When the end portions of the longitudinal slits 43 of the two slit rows R1 and R2 overlap each other in the longitudinal direction X as shown in FIG. 6(b), the length L1 of the overlap preferably constitutes a slit row. The longitudinal slit 43 has a length L2 of 20% or less in the direction X, and is more preferably 10% or less. In the sanitary napkin 1, the length L2 of the longitudinal slit 43 (refer to FIG. 6) is preferably formed to be larger than the top 21T of the skin-side projection 21 adjacent to the longitudinal direction X in the front sheet 2, The distance between 21T and each other is preferably 10 mm or more, more preferably 15 mm or more, further preferably 35 mm or less, further preferably 25 mm or less, further preferably 10 mm or more and 35 mm or less, and further preferably 15 mm or more. And 25mm or less.

In the sanitary napkin 1, an adhesive is applied between the front sheet 2 and the second sheet 9, and between the second sheet 9 and the absorber 4, and is fixed. The subsequent agent can be applied using a well-known mechanism such as a slit coating gun, a spiral spray gun, a spray gun, or a spot gun, and the sanitary napkin 1 is preferably coated in a spiral shape using a spiral spray gun. As the adhesive to be applied, for example, a hot melt adhesive is preferably used. The coating amount of the hot melt adhesive is preferably 1.5 g/m ² or more and 10 g/m ² or less. Further, the absorber 4 and the back sheet 3 may be joined by an adhesive.

The material for forming each constituent member of the sanitary napkin 1 of the present embodiment will be described.

As the front sheet 2, a sheet which is a nonwoven fabric of a multi-layer structure in which a single layer structure or a plurality of layers is laminated is used as a raw material non-woven fabric, and is disclosed, for example, in Japanese Laid-Open Patent Publication No. 2013-133574 It is preferably manufactured by the method described. The front sheet 2 produced by the method described in JP-A-2013-133574 has no shape for forming a sheet having the skin-side projection 21 and the non-skin-side projection 22. The composition of the heat fusion joint.

As the back sheet 3, various sheets and the like which have been used as the back sheet of the absorbent article can be used without particular limitation, and for example, a liquid impervious or water-repellent resin film, a moisture permeable film, a resin film, and the like can be used. Non-woven laminate sheets, etc.

As the absorbent sheets 411 to 413 constituting the absorbent body 4, it is preferable to use an adhesive force generated by a water-absorbent polymer in a wet state or an adhesive such as an adhesive or an adhesive which is additionally added to form an interfiber. Or a combination of a constituent fiber and a water-absorptive polymer to form a sheet or the like. In addition, as the absorbent sheet, an absorbent sheet produced by the method described in JP-A-H08-246395, a pulverized pulp supplied by a gas flow, and a water-absorbent polymer are deposited as an adhesive ( For example, a vinyl acetate-based adhesive, PVA (Polyvinyl Alcohol, etc.), a fixed dry sheet, paper or non-woven An absorbent sheet obtained by dispersing a water-absorbent polymer after applying a hot-melt adhesive or the like between the cloths, an absorbent sheet obtained by blending a water-absorbing polymer in a step of producing a spunbond or melt-blown nonwoven fabric, or the like. These absorbent sheets can be cut into a specific shape and used as a sheet-like absorbent body.

Further, when a slit is formed in the absorbent body 4 as in the case of the sanitary napkin 1, the laminated body of the absorbent sheet may be partially cut by a known cutting mechanism. For example, the cutting device may be used. The apparatus includes: a cutter roll having a plurality of circumferentially extending cutters dispersedly formed on a circumferential surface of the roller in a circumferential direction and an axial length direction of the roller; and an anvil roller receiving the cutter roller .

Further, examples of the water-absorptive polymer constituting the absorber 4 include sodium polyacrylate, (acrylic acid-vinyl alcohol) copolymer, sodium polyacrylate crosslinked body, (starch-acrylic acid) graft copolymer, and (isobutylene- Maleic anhydride) copolymer and saponified product thereof, polyaspartic acid, and the like. Further, the absorbent sheet constituting the absorbent body 4 is preferably a water-absorbent sheet containing a water-absorptive polymer, and may be a combination of a water-absorbent sheet containing a water-absorbent polymer and a water-absorbent polymer. The water-absorbent sheet constitutes a laminate of the water-absorbent sheet of the absorbent body.

As the side sheet 5, various sheets previously used in the art can be used without limitation, and for example, a liquid impervious or water-repellent resin film, a laminate of a resin film and a non-woven fabric, or the like can be used. Examples of other materials include a spunbonded nonwoven fabric, a sheet obtained by combining a spunbonded nonwoven fabric (S) and a melt-blown nonwoven fabric (M) (for example, SM, SMS, SMMS, etc.), a hot-rolled nonwoven fabric, and a hot air non-woven fabric. Water-based (hydrophobic) non-woven fabric. In terms of the degree of skin feel and the prevention of leak detection, it is particularly preferred to use a water-repellent hot air non-woven fabric.

As a method of forming the wing-shaped adhesive portion 71 or the body-adhered portion 72 (anti-offset portion), a method of using an absorbent article previously fixed to a garment such as underwear can be used without particular limitation. For example, the adhesive may be applied directly to the back sheet 3, or the other side of the tape coated with the adhesive may be bonded to the back sheet. Examples of the adhesive for forming the adhesive portion include an emulsion-based, water-based, and solvent-based adhesive. Further, from the viewpoint of obtaining excellent misalignment resistance and stable productivity, the anti-offset portion is preferably formed by applying an adhesive such as a hot-melt adhesive. As such an adhesive, those generally used for such articles can be used without limitation, and it is preferred to mainly use a synthetic rubber-based block copolymer having a basic structure similar to natural rubber. Examples of such a block copolymer include styrene-isoprene-styrene block copolymer (SIS), styrene-ethylene-propylene-styrene copolymer (SEPS), and styrene-butadiene. - styrene block copolymer (SBS), styrene-ethylene-butylene-styrene copolymer (SEBS), and the like. Preferably, the adhesive comprises 10 to 65 wt%, particularly preferably 30 to 50 wt%, of one or more base polymers selected from the group of the block copolymers. Further, the anti-offset portion may not have adhesiveness as long as it can prevent the offset between the absorbent main body and the clothing to be fixed.

The linear pressing groove 8 (the first horizontal pressing groove 81, the vertical pressing groove 82, and the second horizontal pressing groove 83) can be processed by extrusion or with or without heat (so-called embossing), or super Acoustic embossing and the like are formed by embossing in accordance with a conventional method.

The effect of the above sanitary napkin 1 will be described.

In the sanitary napkin 1, as shown in FIG. 3, the topsheet 2 is provided with a plurality of skin-side projections 21 having an internal space S1 and a plurality of non-skin-side projections 22 having an internal space S2. By using the slit 43 of the absorbent body 4 to improve the conformability of the product, the skin-side protruding portion 21 is easy to follow the wearer's movement during wearing. Further, in the sanitary napkin 1, the fiber unit area of the wall portions 21W and 22W is higher than the fiber unit area of the top portion 21T of the skin-side protruding portion 21 and the top portion 22T of the non-skin-side protruding portion 22, so that the skin-side projection is utilized. The top 21T of 21 quickly absorbs the excreted body fluid or the body fluid attached to the skin, and the liquid is quickly transferred by the top pressing against the second sheet 9 during the wearing operation. At the same time, by the slits 43 of the absorbent body 4, the excreted body fluid can be quickly absorbed into the absorbent body 4, and the diffusion of the body fluid can be suppressed on the surface of the front sheet 2. Moreover, since the hollow structure and the second sheet 9 are disposed between the skin-side protruding portions 21 of the front sheet 2 and the second sheet 9, the liquid backflow of the body fluid absorbed into the absorber 4 can be suppressed. especially In the sanitary napkin 1, a portion other than the linear pressing groove 8 in the opposing portion B of the excretion portion is formed as shown in FIG. 4, and a plurality of skin-side projections of the front sheet 2 are formed. The inner spaces S1 and S1 of the hollow structure between the second sheet 9 and the second sheet 9 are connected to each other, and the inner spaces S1 and S1 are connected to each other in the direction of the surface formed by the longitudinal direction X and the lateral direction Y, so that the discharged body fluid can be discharged. The absorption into the absorbent body 4 is more rapidly performed, whereby the diffusion of the body fluid can be further suppressed, and the liquid reflux of the body fluid absorbed into the absorbent body 4 can be further suppressed.

Further, as shown in Fig. 4, in the front sheet 2 of the sanitary napkin 1, the fiber unit area of the wall portions 21W, 22W of the skin-side projection 21 is higher than the fiber unit area of the top portion 21T of the skin-side projection 21. weight. Further, the fiber unit area of the top portion 22T of the non-skin side projection portion 22 is lower than the fiber unit area of the wall portions 21W and 22W. Therefore, the body fluid can be quickly absorbed by the capillary force, and the body fluid can be transferred to the absorber 4 through the through hole 23 of the top portion 22T of the non-skin side projection 22. Especially in the sanitary napkin 1, the through hole 23 is formed in the top portion 22T, so the effect is remarkable.

In the sanitary napkin 1, the top sheet 2 is a sheet in which the skin-side projection 21 and the non-skin-side projection 22 are alternately arranged alternately in two different directions in the plan view. Therefore, the skin-side projection 21 easily follows the movement of the wearer in all directions, and the wearability at the time of wearing is improved. Further, the slit 43 of the absorber 4 is a vertical slit, and as shown in FIG. 5, the drain portion slit region 4S in which the plurality of slits 43 are disposed is not only spread over the drain portion facing portion B but also in the front portion. One part of A and one part of rear part C. Therefore, it is easy to bend with the longitudinal slit 43 as a starting point, and the conformability at the time of wearing is improved. In particular, the interval L21 between the top portions 21T and 21T is formed to be narrower than the distance L43 between the longitudinal slits 43 in the same slit row extending in the lateral direction Y, so that the slit 43 is less likely to be formed when viewed in cross section as shown in FIG. The portion where the position overlaps with the position of the top portion 21T of the skin-side protruding portion 21 does not easily enter the inner space S1 of the skin-side protruding portion 21, and does not easily interfere with the skin feel of the front sheet 2 itself.

Further, as shown in FIG. 2, in the sanitary napkin 1, the slit (long slit) 43 has a four-layer structure. All the layers of the absorbent body 4 of the multilayered portion 42 are formed by applying an adhesive between the second sheet 9 and the absorbent body 4. Therefore, it is possible to prevent the slit (long slit) 43 from being opened too much by the action of the wearer during wearing, and it is possible to prevent wrinkles or liquid accumulation of the sanitary napkin 1 due to opening of the excessive slit (long slit) 43. Thereby improving the sense of wearing.

As described above, the present invention has been described based on preferred embodiments thereof, but the absorbent article of the present invention is not limited to the sanitary napkin 1 of the above embodiment, and can be appropriately changed.

For example, as shown in FIG. 3, the sanitary sheet 1 has a front sheet 2 having a plurality of skin-side projections 21 having an internal space S1 and a plurality of non-skin-side projections 22 having an internal space S2, a front sheet. When the material 2 is viewed in a plan view, the skin-side protruding portion 21 and the non-skin-side protruding portion 22 are alternately arranged in two different directions in which they intersect each other, but a plurality of skin-side projections having the internal space S1 are provided. 21 and a plurality of non-skin side projections 22 having an internal space S2 may be used. For example, as shown in FIG. 7, a skin-side projection 24 having a strip-shaped inner space S3 extending in the longitudinal direction X and a non-skin side projection having a strip-shaped inner space S4 extending in the longitudinal direction X may be used. 25 sheets of the uneven structure which are alternately arranged in the lateral direction Y. Further, the skin-side projection 24 having the strip-shaped inner space S3 extending in the lateral direction Y and the non-skin side projection 25 having the strip-shaped inner space S4 extending in the lateral direction Y may be alternated in the longitudinal direction X. A sheet of uneven structure is disposed. The concavo-convex structure sheet shown in Fig. 7 is formed by forming a concavo-convex structure by stretching the nonwoven fabric sheet by one of the mutually engageable concave rollers, and the top portion and the non-skin side of the skin-side projection 24 are protruded in cross section. The fiber unit area weight of the side region between the bottom regions of the portion may also be formed to be less than the fiber unit area weight of the skin side top region and the fiber unit area weight of the bottom region.

Further, in the sanitary napkin 1, as shown in Figs. 1 and 2, the front surface 2 and the absorbent body 4 are formed on the skin facing surface of the absorbent main body 10 (the skin facing surface of the front sheet 2). a linear extrusion groove 8 formed by integrally recessing the back sheet 3 side, but may not form a linear extrusion groove 8.

Further, in the sanitary napkin 1, the absorbent body 4 is formed of a laminate in which the absorbent sheets 411 to 413 are folded, but it may be formed by laminating a plurality of sheets of the absorbent sheet. Further, the folding method of the absorbent sheet can also employ various folding methods.

Further, as shown in FIGS. 1 and 5, the plurality of slits 43 of the absorbent body 4 of the sanitary napkin 1 are longitudinal slits, but may be transverse slits extending in the lateral direction of the sanitary napkin 1, or The slit extending obliquely with respect to both the longitudinal direction X and the lateral direction Y may also have a longitudinal slit and a transverse slit mixed. Moreover, as shown in FIG. 2, the plurality of slits 43 of the absorbent body 4 of the sanitary napkin 1 penetrate all the layers of the absorber 4 throughout the thickness direction of the absorber 4, but it is sufficient to pass through at least one layer. From the viewpoint of further improving the conformability of the front sheet 2, it is preferable to penetrate at least one layer on the non-skin side, and the bend of the slit 43 is convex toward the skin side, and the auxiliary portion is provided in the multi-layer portion 42. In the case of the absorber 41, it is more preferable to penetrate the auxiliary absorber 41 as well.

Further, the excretion portion slit region 4S of the absorbent body 4 of the sanitary napkin 1 may be formed only in the excretory portion opposing portion B, or may extend from the excretory portion opposing portion B to one of the rear portion C, or may be self-draining portion pair The portion B extends to a portion of the front portion A and a portion of the rear portion C. Further, the number of layers of the absorbent sheet in the multilayer portion 42 may be two or three, or five or more. Further, the difference in the number of laminated sheets of the absorbent sheet of the multilayer portion 42 and the other portions thereof may be one sheet or three or more sheets.

Further, the absorbent article of the present invention may be a sanitary pad (vaginal secretion pad), an incontinence pad or the like in addition to the menstrual napkin.

In the above embodiment of the present invention, the following absorbent article is further disclosed.

<1> An absorbent article comprising: a front sheet forming a liquid permeability of a skin facing surface; a back sheet forming a non-skin opposing surface; and an absorbent body interposed between the two sheets, and An absorbent body having a portion opposite to the excretion portion disposed opposite to the excretion portion of the wearer when worn, and disposed closer to the opposite portion of the excretion portion The front side of the ventral side and the rear side of the wearer facing the opposing portion of the excretory portion, and the absorbent article has a longitudinal direction corresponding to the front and rear directions of the wearer and is orthogonal to the longitudinal direction In the lateral direction, a second sheet composed of a non-woven fabric is disposed between the front sheet and the absorbent body, and the front sheet has a plurality of skin-side projections that protrude toward the skin facing surface side and have an internal space. And a sheet having a concave-convex structure of a plurality of non-skin-side protruding portions that protrude toward the non-skin opposing surface side and having an internal space, and the excretion portion opposing portion includes the skin-side protruding portion and the second sheet a hollow portion of the hollow structure, and a non-pressure-bonding portion in which the non-skin-side protruding portion and the absorbent body are not pressure-bonded, and the top surface of the skin-side protruding portion and the non-skin-side protruding portion when the front sheet is viewed in cross section The fiber unit area weight of the wall portion between the top portions is higher than the fiber unit area weight of the top portion of the skin side protrusion portion and the fiber unit area of the top portion of the non-skin side protrusion portion, the absorption System is formed of a laminated sheet of the absorbent body and to the drain portion having a plurality of slits of the unit, and the slit passes through the laminated body of at least one layer.

(2) The absorbent article according to the above aspect, wherein the hollow portion of the excretion portion facing the hollow portion and the non-crimp portion is present at least in a lateral center of the excretion portion region.

<3> The absorbent article according to <2>, wherein the hollow maintaining portion is present in an area of 50% or more with respect to a total area of the opposing portion of the excretory portion.

The absorbent article according to any one of the above aspects, wherein the front surface sheet and the second sheet are formed on the skin facing surface of the absorbent body toward the back sheet side. a linear extrusion groove formed by being integrally recessed, and the front sheet and the second sheet are not pressure-bonded to the portion other than the linear pressing groove in the opposing portion of the drain portion.

The absorbent article according to any one of the above aspects, wherein the skin-side protruding portion and the non-skin-side protruding portion are alternately arranged in the lateral direction.

<6> The absorbent article according to any one of <1> to <5> wherein When the front sheet is observed, the skin-side protruding portion and the non-skin-side protruding portion are alternately arranged alternately in two different directions intersecting each other.

The absorbent article according to any one of the above aspects, wherein the top surface of the front side of the skin-side projections in the lateral sheet is spaced apart from each other by 2 mm or more and 30 mm. the following.

The absorbent article according to any one of the aspects of the present invention, wherein the slit is a longitudinal slit extending in the longitudinal direction, and is dispersed in two directions of the longitudinal direction and the transverse direction. The tops of the skin-side protrusions adjacent to the laterally adjacent ones are spaced apart from each other by a gap narrower than the slits adjacent to each other in the lateral direction.

<9> The absorbent article according to <8>, wherein the length of the longitudinal slit is formed to be longer than a distance between the tops of the skin-side projections adjacent to the longitudinal direction in the front sheet.

<10> The absorbent article according to <8>, wherein the longitudinal slit has a length of 10 mm or more and 35 mm or less.

<11> The absorbent article according to <10>, wherein the longitudinal slit has a length of 15 mm or more and 25 mm or less.

The absorbent article according to any one of the above aspects, wherein the second sheet and the absorber are fixed by an adhesive, and the slit penetrates all the layers of the laminate. .

The absorbent article according to the above aspect, wherein the distance between the tops of the skin-side protruding portions or the tops of the non-skin-side protruding portions is 3 mm or more and 15 mm or less.

The absorbent article according to any one of the above aspects, wherein the fiber portion area of the wall portion of the skin-side protruding portion is higher than the fiber unit area of the top portion of the skin-side protruding portion.

<15> The absorbent article according to any one of <1> to <14> wherein The density of the fibers at the top of the non-skin side projection is lower than the surrounding portion.

<16> The absorbent article according to <15>, wherein the top of the plurality of non-skin side projections has a through hole.

<17> The absorbent article according to <15>, wherein the relationship between the weight per unit area of the fibers is the top of the non-skin side projections <the top of the skin-side projections < the wall portion of the skin-side projections .

The absorbent article according to any one of the aspects of the present invention, wherein the protruding shape of the skin-side protruding portion is a hemispherical shape or a pyramidal shape.

<19> The absorbent article according to <18>, wherein the protruding shape of the skin-side protruding portion is a hemisphere or a cone, a truncated cone, a pyramid, a truncated cone, and an oblique cone.

The absorbent article according to any one of <1> to <19> wherein the non-skin-side projection has a protruding shape of a cone or a truncated cone shape having a curvature at the top.

The absorbent article according to any one of <1> to <20> wherein the front sheet has a compression ratio of 40 to 95%.

The absorbent article according to any one of the above aspects, wherein the surface sheet has a compression energy of 0.98 mN‧m/cm ² or more and 9.8 mN‧m/cm ² or less.

The absorbent article according to any one of the above aspects, wherein the sheet of the front sheet has a thickness of 1 mm or more and 3.5 mm or less.

The absorbent article according to any one of <1> to <23> wherein the second sheet has a basis weight of 10 g/m ² or more and 50 g/m ² or less.

<25> The absorbent article according to <24>, wherein the second sheet has a basis weight of 15 g/m ² or more and 40 g/m ² or less.

The absorbent article according to any one of <1> to <25> wherein the thickness of the second sheet is 0.1 mm or more and 5 mm or less.

<27> The absorbent article according to any one of <1> to <26> wherein The slit is a longitudinal slit extending in the longitudinal direction, and is dispersed in both the longitudinal direction and the lateral direction, and in the lateral direction, the tops of the skin-side projections are spaced apart from each other with respect to the longitudinal slits The ratio is 10% or more and 70% or less.

<28> The absorbent article according to <27>, wherein the ratio is 30% or more and 55% or less.

<29> The absorbent article according to any one of <1> to <28> which is a menstrual period cotton.

Example

Hereinafter, the absorbent article of the present invention will be described in further detail by way of examples. However, the scope of the invention is not limited by the embodiment.

<Example 1>

The menstrual sanitary napkin having the same basic structure as the menstrual sanitary napkin 1 shown in Figs. 1 and 2 including the front sheet shown in Figs. 3 and 4 is prepared as the sample of the first embodiment. . As the top sheet, a sheet produced by the method described in JP-A-2013-133574 is used. The top sheet is composed of polyethylene terephthalate in a core and 2.4 dtex of polyethylene in a sheath to form a weight per unit area of 10 gsm, the lower layer comprises polyethylene terephthalate in a core and the sheath comprises polyethylene. The 2.9 dtex fiber was formed to have a basis weight of 15 gsm, adjusted to a total of 25 g/m ² , and the thickness T _s of the entire surface material was adjusted to 1.7 mm. The fiber unit area weight of the top portion 22T of the non-skin side projection is 32 pieces/mm ² , and the fiber unit area weight of the top portion 21T of the skin side protrusion portion is 39 pieces/mm ² , and the wall portion of the skin side protrusion portion The unit weight of the fiber of 21W is 46 pieces/mm ² . Further, the distance L21 between the top portions 21T and 21T of the skin-side protruding portions adjacent to each other in the lateral direction Y is 5 mm, and the top portions 21T and 21T of the skin-side protruding portions adjacent to each other in the longitudinal direction X are spaced apart from each other by 7 mm. As the second sheet, a hot air non-woven fabric having a basis weight of 25 g/m ² was used. Regarding the longitudinal slit of the absorbent body formed of the absorbent sheet, the transverse length, that is, the width W43 is 0.3 mm, the longitudinal length L2 is 20 mm, and the longitudinal slits are spaced apart from each other by L43.

<Example 2>

A menstrual sanitary napkin was produced in the same manner as in Example 1 except that the following was used as the front sheet. The top sheet is composed of polyethylene terephthalate in a core and 2.4 dtex of polyethylene in a sheath to form a weight per unit area of 10 gsm, the lower layer comprises polyethylene terephthalate in a core and the sheath comprises polyethylene. The 2.9 dtex fiber was formed to have a basis weight of 15 gsm, adjusted to a total of 25 g/m ² , and the thickness T _s of the entire surface material was adjusted to 1.6 mm, and a through hole portion was provided near the bottom. The fiber unit area weight of the top portion 22T of the non-skin side projection is 29 pieces/mm ² , and the fiber unit area weight of the top portion 21T of the skin side protrusion portion is 40 pieces/mm ² , and the wall portion of the skin side protrusion portion The unit weight of 21W fiber is 45/mm ²

<Comparative Example 1>

A sample of Comparative Example 1 was produced in the same manner as in Example 1 except that the front sheet was replaced with the top sheet 200 shown in Fig. 8 in the sample of Example 1. The front sheet 200 includes a fiber sheet having a single-layer structure, and the concave portion 201 formed by crimping the constituent fibers thereof is arranged in a diagonal lattice shape. A plurality of divided regions 202 which are lumped by the oblique lattice-shaped recesses 201 are formed in the front sheet 200. Each of the divided regions 202 is a convex portion that is raised relative to the concave portion 201. Therefore, the front sheet 200 is a sheet having a plurality of concave portions 201 formed in a diagonal lattice shape and a concave-convex shape as a divided portion 202 of the convex portion surrounded by the concave portion 201. Further, the divided regions 202 as the convex portions are filled with the constituent fibers of the front sheet 200. Further, the front sheet 200 has a basis weight of 25 g/m ² , the concave portion 201 has a width of 0.5 mm, and the divided region 202 has an area of 0.45 cm ² .

[Evaluation]

With respect to the samples of Example 1 and Comparative Example 1 (menstrual sanitary napkin), the liquid absorption time, the absorption residual amount, the liquid return flow rate, and the diffusion area were evaluated by the following methods, respectively. These results are shown in Table 1 below.

<Liquid absorption time>

Each of the samples of the examples and the comparative examples was placed on a test bench, and an elliptical cylinder having a long axis of 50 mm and a short axis of 22.5 mm and an acrylic resin having a height of 30 mm were integrally molded into the elliptical tube portion. The acrylic resin liquid-filled sheet is placed such that the liquid-filled hole is placed on the center of the opposite portion of the excretion portion of the skin opposite surface (front sheet side) of the sample, and the appropriate weight plate is placed (including the injection) The liquid plate itself was adjusted so that the load became 5 g/m ² . The horse hair fiber blood produced by NIPPON BIO-TEST was prepared in advance at room temperature (23 ° C), and 6 g was placed in a 10 cc injection beaker. The blood was once injected into the cylinder of the liquid-filling plate, and the time (seconds) from when the injection was completed until the blood in the cylinder disappeared to expose the front sheet of the sample was measured. Each sample was measured three times, and the average value thereof was set as the liquid absorption time of the sample.

<Absorption residual amount>

1 g of defibrinated horse blood (manufactured by NIPPON BIO-TEST Co., Ltd.) was dropped on a glass-made smooth surface plate placed horizontally. The menstrual sanitary napkin is placed thereon in such a manner that the front sheet is downward. After maintaining this state for 1 minute, the menstrual napkin was removed, and the amount of defibrinated horse blood remaining on the plate was measured. Each sample was measured three times, and the average value thereof was set as the absorption residual amount of the sample.

<Liquid return flow after 2 minutes of placement>

After measuring the liquid absorption time, the sample is kept under pressure for 2 minutes, and then the liquid injection plate is removed together with the weight, and the liquid absorption portion of the sample (the liquid portion is injected in the measurement of the liquid absorption time), 10 pieces of pre-weighed absorbent paper (length 170mm, width 70mm, weight per unit area 30g/cm ² ) were superimposed on the surface of the sample, and the sample was quickly attached to the crotch portion of the shorts and the exercise walking model was Wear it and let it walk for 1 minute. After the walking, the operation of the model was stopped, and the absorbent paper was taken out and weighed, and the amount (g) of the liquid absorbed by the absorbent paper was calculated. Each sample was measured 3 times, and the average value was set as the liquid return flow rate of the sample.

<Liquid diffusion area>

Immediately after the measurement of the liquid return flow rate, the film for OHP (Over Head Projector) was placed on the front sheet, and the outline of the portion where the front sheet was diffused into red was written. Using a dedicated software (Image-ProPlus, manufactured by NIPPON ROPER Co., Ltd.) which can measure the area inside the outline, a liquid diffused area is obtained by inputting an image written to the OHP film to a personal computer by a scanner. Each sample was measured three times, and the average value thereof was defined as the liquid diffusion area of the sample.

According to the results of Table 1, it was found that the menstrual sanitary napkin of Example 1 had a smaller absorption time than the menstrual sanitary napkin of Comparative Example 1, although the liquid absorption time was the same. It can be seen that the menstrual sanitary napkin of Example 2 has a shorter liquid absorption time and less absorption residual amount than the menstrual sanitary napkin of Comparative Example 1. Therefore, the menstrual sanitary napkins of Examples 1 and 2 can be expected to quickly absorb the excreted body fluid into the absorbent body as compared with the menstrual sanitary napkin of Comparative Example 1. Further, it can be seen that the menstrual sanitary napkins of Examples 1 and 2 have a smaller liquid return flow rate and a smaller liquid diffusion area after being left for 2 minutes as compared with the menstrual sanitary napkin of Comparative Example 1. Therefore, the menstrual sanitary napkins of the first embodiment and the second embodiment can be expected to suppress the diffusion of the excreted body fluid on the surface of the front sheet as compared with the menstrual sanitary napkin of the comparative example 1, and can suppress the body fluid absorbed into the absorbent body. The liquid is refluxed.

[Industrial availability]

According to the absorbent article of the present invention, the excreted body fluid can be quickly absorbed to the absorption In the body, the diffusion of the excreted body fluid can be suppressed on the surface of the front sheet, and the liquid backflow of the body fluid absorbed into the absorber can be suppressed.

1‧‧‧Sanitary cotton

2‧‧‧Front sheet

3‧‧‧Back sheet

4‧‧‧Acceptor

5‧‧‧Side sheet

8‧‧‧Linear extrusion tank

9‧‧‧Second sheet

10‧‧‧Absorbable ontology

10W‧‧‧wings

21‧‧‧Skin side protrusion

22‧‧‧ Non-skin side projections

23‧‧‧through hole

40‧‧‧Main absorber

41‧‧‧Assistant absorber

42‧‧‧Multi-layer

43‧‧‧Slit

61‧‧‧1st bonding wire

71‧‧‧of the wing joint

72‧‧‧ body adhesion

82‧‧‧Squeezing slot

411‧‧‧Absorbable sheet

412‧‧‧Absorbable sheet

413‧‧‧Absorbable sheet

P‧‧‧Space Department

Claims (29)

An absorbent article comprising a liquid-permeable front sheet forming a skin facing surface, a back sheet forming a non-skin opposing surface, and an absorbent body interposed between the two sheets, and including absorbency The main body, the absorbent body is disposed in a front portion of the excretion portion disposed opposite to the excretion portion of the wearer when worn, disposed in a front side of the abdomen of the wearer facing the excretion portion, and disposed in the front side The excretory portion is opposite to the rear side of the wearer, and the absorbent article has a longitudinal direction corresponding to the front and rear directions of the wearer and a transverse direction orthogonal to the longitudinal direction, and the front sheet and the absorber are A second sheet composed of a non-woven fabric is disposed, and the front sheet includes a plurality of skin-side protruding portions that protrude toward the skin facing surface side and have an internal space, and protrudes toward the non-skin opposing surface side and has a sheet of a plurality of non-skin-side protruding portions having an uneven structure in the internal space, wherein the excretion portion facing portion includes a hollow portion having a hollow structure between the skin-side protruding portion and the second sheet, and the non- a non-crimping portion of the skin-side protruding portion and the absorbent body that is not pressure-bonded, and a fiber unit of the wall portion between the top of the skin-side protruding portion and the top portion of the non-skin-side protruding portion when the front sheet is viewed in cross section The area weight is higher than the fiber unit area weight of the top of the skin side protrusion and the fiber unit area of the top of the non-skin side protrusion, and the absorption system is formed of a laminate of the absorbent sheet and is opposed to the excretion portion. The portion has a plurality of slits, and the slit penetrates at least one layer of the laminate. The absorbent article according to claim 1, wherein the hollow maintaining portion including the hollow portion and the non-crimping portion in the opposing portion of the excretion portion exists at least in the excretion portion The central area of the landscape in the department. The absorbent article according to claim 2, wherein the hollow maintaining portion is present in an area of 50% or more with respect to a total area of the opposing portion of the excretory portion. The absorbent article according to claim 1, wherein the surface of the absorbent body is formed with a linear extrusion groove in which the front sheet and the second sheet are integrally recessed toward the back sheet side, and The front sheet and the second sheet are not pressure-bonded to the portion of the excretion portion opposite to the linear pressing groove. The absorbent article according to claim 1, wherein the skin-side projection and the non-skin-side projection are alternately arranged in the lateral direction. The absorbent article according to claim 1, wherein the skin-side protruding portion and the non-skin-side protruding portion are alternately arranged alternately in two different directions intersecting each other when the front sheet is viewed in a plan view. The absorbent article according to claim 5, wherein a distance between the tops of the skin-side projections adjacent to each other in the lateral direction in the front sheet is 2 mm or more and 30 mm or less. The absorbent article of claim 5, wherein the slit is a longitudinal slit extending in the longitudinal direction, and is dispersed in the longitudinal direction and the transverse direction, and the lateral sheet is adjacent to the laterally adjacent The tops of the skin-side projections are spaced apart from each other to be narrower than the slits adjacent to each other in the lateral direction. The absorbent article of claim 8, wherein the length of the longitudinal slit is formed to be longer than the top of the longitudinally adjacent skin side projections in the front sheet. The absorbent article of claim 8, wherein the longitudinal slit has a length of 10 mm or more and 35 mm or less. The absorbent article of claim 10, wherein the longitudinal slit has a length of 15 mm or more and 25 mm or less. The absorbent article according to claim 1, wherein the second sheet and the absorbent body are fixed by an adhesive, and the slit penetrates through all the layers of the laminated body. The absorbent article according to claim 12, wherein the top of the skin-side protruding portion is spaced apart from each other or the top of the non-skin-side protruding portion is spaced apart from each other by 3 mm or more and 15 mm or less. The absorbent article of claim 1, wherein the fiber unit area of the wall portion of the skin-side projection is heavier than the fiber unit area of the top of the skin-side projection. The absorbent article of claim 1, wherein the density of the fibers at the top of the non-skin side projection is lower than the peripheral portion thereof. The absorbent article of claim 15, wherein the top of the plurality of non-skin side projections has a through hole. The absorbent article according to claim 15, wherein the relationship between the weight per unit area of the fibers is the top of the non-skin side projections < the top of the skin-side projections < the wall portion of the skin-side projections. The absorbent article of claim 1, wherein the protruding shape of the skin-side projection is a hemispherical shape or a pyramidal shape. The absorbent article of claim 18, wherein the protruding shape of the skin-side projection is a hemisphere or a cone, a truncated cone, a pyramid, a truncated cone, and an oblique cone. The absorbent article of claim 1, wherein the protruding shape of the non-skin side projection is a conical or truncated cone shape having a curvature at the top. The absorbent article of claim 1, wherein the compression ratio of the front sheet is 40 to 95%. The absorbent article of claim 1, wherein the front sheet has a compression energy of 0.98 mN‧m/cm ² or more and 9.8 mN‧m/cm ² or less. The absorbent article according to claim 1, wherein the sheet of the above-mentioned front sheet has a thickness of 1 mm or more and 3.5 mm or less. The absorbent article of claim 1, wherein the second sheet has a basis weight of 10 g/m ² or more and 50 g/m ² or less. The absorbent article of claim 24, wherein the second sheet has a basis weight of 15 g/m ² or more and 40 g/m ² or less. The absorbent article of claim 1, wherein the thickness of the second sheet is 0.1 mm or more and 5 mm or less. The absorbent article of claim 1, wherein the slit is a longitudinal slit extending in the longitudinal direction, and is dispersed in both the longitudinal direction and the transverse direction, and in the lateral direction, the tops of the skin-side projections are spaced apart from each other The ratio of the distance between the longitudinal slits is 10% or more and 70% or less. The absorbent article of claim 27, wherein the ratio is 30% or more and 55% or less. An absorbent article according to claim 1 which is a menstrual napkin.