JP2013132523A - Absorptive article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorptive article which improves the liquid permeability of an uneven surface sheet, and the liquid diffusivity within an absorptive body.SOLUTION: The surface sheet 1 disposed on the side of a skin abutting surface includes: a first protrusion 11 which protrudes toward a first surface side Z1, and has an internal space 11S; and a second protrusion 12 which protrudes toward a second surface side Z2 opposite to the first surface side Z1, and has an internal space 12S. The first and second protrusions 11, 12 are continuously disposed alternately in each different direction intersecting with each other in a planar view over the whole surface of the surface sheet 1. A wall portion 13 having an annular structure exists between the top 12T and the opening 12H of the second protrusion. The absorptive body 3 includes: a first basis weight part 31; a second basis weight part 32; and a groove-like depressed portion 33 which is depressed toward the side of the surface sheet 1 from the side of a rear surface sheet 2 with the second basis weight part 32 as a bottom surface, and extends at least in a longitudinal direction. At least a part of the adjacent first and second protrusions 11, 12 and the depressed portion are disposed opposite to each other with the absorptive body therebetween.

Description

  The present invention relates to an absorbent article.

Absorbent articles such as sanitary napkins, panty liners, and disposable diapers are usually applied directly to the wearer's skin. In this case, it is often used in a place where rough skin is likely to be worn, and it may be worn for a long time. Therefore, a gentle touch per skin is desired. On the other hand, this type of absorbent article is required to have liquid absorbency and liquid retention as basic functions.
As a conventional absorptive article, there exists a thing of composition which has arranged flat surface sheet 1 on absorber 3 as shown in FIG. In this configuration, when the absorber 3 approaches the liquid absorption limit, the amount of absorbed liquid decreases, so that the diffusion of the liquid on the top sheet 1 is most dominant, and the liquid is diffused on the top sheet 1. For this reason, side leakage occurred and there was a feeling of stickiness to the skin.

Then, development of the surface sheet for absorbent articles is tried. Patent Document 1 discloses a surface sheet having a large number of convex portions that are formed of an upper layer sheet and a lower layer sheet and have a hollow inside. In this surface sheet, the bottom surface of the convex portion has a rectangular shape, and the convex portion has a rectangular parallelepiped shape or a truncated pyramid shape as a whole.
However, in the surface sheet disclosed in Patent Document 1, the amount of liquid flowing into the cavity in the convex portion is not sufficiently large because the fiber amount of the top portion of the convex portion and the wall portion is substantially the same.
Further, in Patent Document 2, a part or all of the surface is formed by alternately combining multiple rows of ridges and groove portions, the ridge portions are curved in a convex shape, and the groove portions are curved in a concave shape. A surface sheet is disclosed in which a large number of apertures are arranged at intervals. In the peripheral part of the opening part, it has a three-dimensional rib which stands up from the surface of this surface sheet toward the back surface.
However, in the surface sheet disclosed in Patent Document 2, the amount of fiber on the side wall of the opening is the same as that on the top, so the liquid permeability of the wall is not high, and the amount of liquid outflow to the cavity in the collar is low. Not enough. For this reason, the liquid movement on the surface sheet is superior to the liquid movement through the fiber layer of the surface sheet.
Further, in Patent Document 3, the first fiber layer disposed on the skin side and the second fiber layer disposed on the absorber side are laminated and partially joined at a joint portion of a predetermined pattern. As for the layer, the surface sheet for absorbent articles in which portions other than the joint portion are convex on the skin side is disclosed.
However, in the surface sheet disclosed in Patent Document 3, there is no disclosure about the amount of fibers in the convex portion, and the amount of liquid flowing into the cavity in the convex portion is not sufficiently large.

JP 2004-174234 A Japanese Patent Laid-Open No. 09-299402 JP 2004-000466 A

  An object of the present invention is to provide an absorbent article having improved liquid permeability of a surface sheet having irregularities and improved liquid diffusibility in an absorbent body.

The present invention has a top sheet disposed on the skin contact surface side, a back sheet disposed on the non-skin contact surface side, and an absorber interposed between the both sheets,
The top sheet protrudes on the first surface side on the liquid supply side and has an internal space; and a second protrusion portion protrudes on the second surface side opposite to the first surface side and has an internal space; The first and second protrusions are alternately and continuously arranged in different directions intersecting in plan view over the entire surface sheet, and the top of the second protrusion and the opening thereof A wall portion having an annular structure in between, and the wall portion has fiber orientation in a direction connecting the top portion of the second projecting portion and the opening,
The absorbent body has a first basis weight part and a second basis weight part having a lower basis weight and surrounding the first basis weight part, and is in contact with the top of the second protrusion of the topsheet. And having a groove-like recess extending at least in the longitudinal direction with the second basis weight portion being a bottom surface, recessed from the back sheet side to the top sheet,
At least a part of the first and second protrusions adjacent to each other and the concave portion provide an absorbent article that is disposed at a position facing each other with the absorbent body interposed therebetween.

  When a large amount of liquid is supplied, the absorbent article of the present invention can temporarily hold the liquid in the internal space of the second protrusion due to the fiber orientation, and the liquid can be retained from the wall to the first protrusion. A large amount of liquid can be quickly transferred to the absorber through the internal space. Further, the liquid that cannot be absorbed by the absorbent body is transferred from the first basis weight part to the concave part, is diffused over the concave part, and is absorbed in a wide range of the absorbent body. The feeling of stickiness can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS It is drawing which showed one preferable embodiment of the absorbent article of this invention, (1) is typical fragmentary sectional drawing which showed a part of absorbent main body of an absorbent article, (2) is a surface sheet. It is the typical fragmentary sectional view which showed the dimension measurement position of each part. It is the contour map which showed an example of the preferable plane arrangement | positioning of the protrusion part seen from the 1st surface side of the surface sheet which concerns on the absorbent article of the preferable embodiment of this invention. It is the contour map which showed the modification of the planar layout of the protrusion part seen from the 1st surface side of the surface sheet which concerns on the absorbent article of preferable embodiment of this invention. It is sectional drawing which showed a preferable example of the absorber of the absorbent article of this invention. It is the plane arrangement | positioning figure which showed a preferable example of the absorber of the absorbent article of this invention. In the absorbent article of this invention, it is schematic structure sectional drawing shown about the liquid movement in case there are few liquids supplied on the surface sheet. In the absorbent article of this invention, it is schematic structure sectional drawing shown about the liquid movement in case there are many liquids supplied on the surface sheet. In the absorbent article of this invention, it is schematic structure sectional drawing shown about the liquid movement in case there are still many liquids supplied on the surface sheet. It is the perspective view which showed preferable one Embodiment of the underpants type wearing article which concerns on this invention. It is drawing which showed an example of the surface sheet and absorber of a prior art, (1) is a disassembled perspective view, (2) is sectional drawing.

  A preferred embodiment of the absorbent article according to the present invention will be described below with reference to FIGS. 1 to 5. Each component will be described with reference numerals.

  As shown in FIG. 1, the absorbent article of this invention has the basic composition demonstrated below. That is, a liquid-permeable top sheet 1 disposed on the skin contact surface side, a liquid-impermeable back sheet 2 disposed on the non-skin contact surface side, and between the top sheet 1 and the back sheet 2 And an absorbent main body 4 having an absorbent body (also referred to as an absorbent core) 3 having liquid retention properties interposed therebetween.

The said absorptive main body 4 can use the material normally used for this kind of diaper etc., It does not specifically limit.
The top sheet 1 is preferably formed of a liquid permeable nonwoven fabric. The liquid-permeable nonwoven fabric is a nonwoven fabric called air-through nonwoven fabric, point-bonded nonwoven fabric, spunbonded nonwoven fabric, spunlace nonwoven fabric, and three-dimensional shaped nonwoven fabric, and the fibers are polypropylene single fibers or polypropylene-polyethylene composite fibers, A fiber that has been subjected to a hydrophilic treatment with a composite fiber of polyethylene terephthalate and polyethylene can be preferably used.

  The said back surface sheet 2 will not be specifically limited if it has waterproofness and moisture permeability. For example, a film is formed by melt-kneading a hydrophobic thermoplastic resin, a fine inorganic filler made of calcium carbonate or the like or an incompatible organic polymer, and the film is obtained by uniaxial or biaxial stretching. A porous film is mentioned. Examples of the thermoplastic resin include polyolefin. Examples of the polyolefin include high to low density polyethylene, linear low density polyethylene, polypropylene, polybutene and the like, and these can be used alone or in combination.

As the absorbent body 3, for example, a fiber aggregate or a combination of this and an absorbent polymer can be used. As the fibers constituting the fiber assembly, hydrophilic natural fibers such as pulp fibers, synthetic fibers (preferably subjected to hydrophilic treatment), and the like can be used. The basis weight is not particularly ^limited, preferably ^{150g / m 2 ~500g / m 2} . Moreover, the coating sheet which coat | covers the absorber 3 can also be used. This coated sheet includes thin paper such as hydrophilic tissue paper (thin paper), non-woven fabric made of hydrophilic fibers such as cotton and rayon, and non-woven fabric made by subjecting synthetic resin fibers to hydrophilic treatment (spunbond-meltblown) -Spunbond (SMS), spunbond-meltblown-meltblown-spunbond (SMMS), spunbond-spunbond-meltblown-spunbond (SSMS), etc.

Next, the details of the top sheet 1 will be described below.
The top sheet 1 covers the entire surface of the first projecting portion 11 that projects to the first surface (front surface) side Z1 on the liquid supply side and the second surface (back surface) side Z2 opposite to the first surface side Z1. The projecting second projecting portions 12 are arranged at a predetermined interval. Details of the planar arrangement example of the first and second protrusions 11 and 12 will be described later. It is preferable that the first surface side Z1 is directed to the skin surface side of the wearer, and the second surface side Z2 is disposed on the absorber 3 side inside the absorbent article. Hereinafter, description will be given in consideration of an embodiment in which the first surface side Z1 is used toward the skin surface of the wearer.

A wall portion 13 exists between the top portion 12T of the second projecting portion 12 (hereinafter also referred to as the second top portion 12T) and the opening portion 12H. The wall portion 13 forms an annular structure at the second projecting portion 12. The fibers constituting the wall portion 13 have fiber orientation mainly in the direction connecting the second top portion 12T and the edge of the opening 12H (the direction of the double arrow shown in FIG. 1). In other words, it has a radial fiber orientation toward the second top portion 12T. Therefore, the fibers are oriented so as to converge toward the second top portion 12T along the surface direction of the sheet surface from the wall portion 13 to the second projecting portion 12. As described above, since there is a radial fiber orientation toward the second top portion 12T, the liquid transfer described later has a driving action and an excellent cushioning property. That is, the first and second projecting portions 11 and 12 have excellent liquid permeability, are not easily crushed, and can be easily recovered even when deformation occurs.
Further, the wall portion 13 has less fiber than the top portion 11T of the first protruding portion 1 (hereinafter also referred to as the first top portion 11T) and the top portion 12T of the second protruding portion 12. Furthermore, the density of the first and second top portions 11T and 12T is higher than that of the wall portion 13. In addition, the fiber amount of the surface sheet 1 formed with unevenness in the present invention is difficult to specify because the change in the minute region is large, and the fiber amount of the wall portion 13 and the first and second top portions 11T and 12T is the distance between the fibers. By measuring, relative size can be inferred. Specifically, since the proportion of fibers decreases as the interfiber distance increases, the amount of fibers decreases compared to a structure having a small interfiber distance.
Further, by measuring the substantial thickness (hereinafter, referred to as “substantial thickness”) at each minute portion of the surface sheet 1, it is possible to relatively compare the size of the density from the estimation of the size of the substantial thickness and the amount of fiber. Evaluate whether the fiber overlap state is closely attached (small thickness) or separated (large thickness) from the observation in the thickness direction with respect to the amount of fiber relatively judged by the interfiber distance. it can. Specifically, the distance between fibers can be compared by comparing the volume of a cylinder in which a circular cavity surrounded by fibers expands in the thickness direction, and the distance between fibers is the diameter. It can be estimated that the density is lower as the volume of one cylindrical body having a substantial thickness is higher.
In the absorbent article of the present invention, the distance between fibers in the wall portion 13 affects the ease of permeation of the surface sheet liquid when absorbing a large amount, and the distance between fibers and the substantial thickness of the wall portion 13 affects the structural stability. ing. In addition, the preferable range of the interfiber distance and the substantial thickness will be described in paragraph [0017].

Next, specific examples of the shapes of the first and second protrusions 11 and 12 will be described below.
The first and second apexes 11T and 12T are round frustoconical or hemispherical. More specifically, the protruding shape of the first protruding portion 11 is closer to a hemispherical shape than a sharp tip, while the protruding shape of the second protruding portion 12 is a sharper tip with a rounded top or truncated cone shape. It is made. In this embodiment, the shape of the 1st, 2nd protrusion parts 11 and 12 is not limited to the said shape, What kind of protrusion form may be sufficient. For example, various cone shapes can be employed. For example, the cone shape in this specification includes a wide range of cones, truncated cones, pyramids, truncated pyramids, oblique cones, and the like.
The first and second protrusions 11 and 12 have frustoconical or hemispherical internal spaces 11S and 12S having rounded tops similar to the outer shape. Each of the internal spaces 11S and 12S is separated through a ridge portion 14 connecting the first top portions 11T of the adjacent first protrusions 11 and forms a substantially non-continuous space.
On the other hand, as described above, the wall portion 13 is formed between the top portions 11T and 12T of the first and second projecting portions 11 and 12 and the respective opening portions 11H and 12H. It has a sheet structure in which the first and second projecting portions 11 and 12 are continuous via the ridge portion 14.

  The apparent thickness of the entire surface sheet 1 (from the first top portion 11T to the second top portion 12T) in the present invention (hereinafter referred to as the sheet apparent thickness t10) is not particularly limited, but a good cushion feeling for the absorbent article. From the viewpoint of providing a thickness of 1.0 mm to 9.0 mm, preferably 1.5 mm to 7.0 mm, more preferably 2.0 mm to 6.0 mm. Further, the apparent thickness of the first protrusion 11 between the lowest position of the ridge portion 14 from the first top 11T (the apparent thickness t11 of the first top 11T) is 0.1 mm to from the viewpoint of achieving both cushioning properties and smoothness. It is 3.0 mm, preferably 0.3 mm to 2.5 mm, more preferably 0.5 mm to 2.0 mm. The second protrusion 12 between the wall 13 and the top 12T of the second protrusion (from the ridge 14 to the second top 12T) has a cup shape surrounded by the wall 13, and the second protrusion in this shape The apparent thickness of the portion 12 (hereinafter referred to as cup height Hc) is 0.5 mm to 8.0 mm, preferably 0.7 mm to 7.0 mm, more preferably 1.0 mm to 5.0 mm.

The substantial thickness of the topsheet at each portion of the first top portion 11T, the second top portion 12T, and the wall portion 13 is such that the wall portion 13 is thinner than the first top portion 11T and the second top portion 12T, and the substantial thickness of the first top portion 11T. The thickness t111 is 0.5 to 2.0 mm, and the wall portion 13 is 0.1 to 0.7 mm in actual thickness t131 of a portion 1/3 from the skin side surface and 2/3 from the skin side surface. The actual thickness t132 of the point is 0.5 to 1.0 mm. At this time, when a large amount of liquid such as urine is excreted at a time, the liquid is transferred from the second top portion 12T to the absorber 3, so that the amount of liquid overflowing from the cup portion and transmitted to the absorber 3 is overwhelming. For this reason, the substantial thickness t121 of the second top portion 12T is less affected when the large amount of liquid is transferred. On the other hand, the cup is not crushed under pressure, that is, from the viewpoint of maintaining the shape, the lower portion of the cup of the wall 13 (here, 1/3 point from the top 12T of the second protrusion 12 having an apparent thickness (cup height Hc)). The thickness (substantial thickness t132) is within the above range, thereby forming a fiber structure necessary for shape retention.
Further, the first apex portion 11T and the wall portion 13 are different in fiber orientation and the size of the gap between fibers (interfiber distance) when viewed in plan. The fiber orientation measured by the method described later is measured so that the MD direction of the topsheet 1 is at an angle of 0 ° during orientation measurement for the first top portion 11T. In the case of the position as shown in FIG. 2, the orientation angle in the wall portion 13 adjacent to the direction perpendicular to the MD orientation in the first top portion 11T is 90 in the provisional line direction connecting the first top portion 11T and the second top portion 12T. Obtain the orientation angle as °. The orientation angle in the wall portion 13 is such that it is along the provisional line direction connecting the first top portion 11T and the second top portion 12T when 0-360 ° is corrected (converted) to an angle range of 0-180 ° (temporary). (Within about ± 30 ° in the line direction) The fiber has an orientation angle.

  The measurement of the orientation in the wall portion 13 is easier to observe the change in the fiber orientation when the direction away from the MD direction is measured than the portion of the top sheet 1 that is continuous in the MD direction. Therefore, when the wall portion 13 adjacent to the first top portion 11T is arranged as shown in FIG. 3, the intersection angle between the temporary line connecting the first top portion 11T and the second top portion 12T and the MD direction is 90 ° ±. Fiber orientation, which will be described later, is measured so that the direction of the provisional line connecting the first top portion 11T and the second top portion 12T is 90 °, targeting the one in the 45 ° direction.

  Moreover, it is more preferable that the orientation strength of the wall portion 13 is as high as 1.05 or more. The orientation strength of the first top portion 11T is not particularly limited, but is more preferably lower than the wall portion 13. Since the orientation angles are different between the top portions 11T and 12T and the wall portion 13 at the adjacent positions described above, the fibers are oriented so as to converge on the second top portion 12T side at the wall portion 13. Moreover, when the orientation strength of the wall portion 13 is high, a large amount of liquid is excreted, and when the fibers of the wall portion 13 contain water, the distance between the fibers opens, and the liquid can be delivered to the absorber 3 at a stretch. . The average interfiber distance at the first top portion 11T is preferably 1 to 40 μm, more preferably 5 to 30 μm, from the viewpoint of smoothness. Further, the average inter-fiber distance in the wall portion 13 is preferably 10 to 100 μm, more preferably 15 to 80 μm, from the viewpoint of allowing the liquid to pass, which is larger than the first top portion 11T. Further, from the viewpoint of maintaining the structure of the wall 13 and the viewpoint of movement into the internal space 12S when absorbing a large amount of liquid, the number ratio of the interfiber distance of 40 μm or more is preferably 5 to 50%, more preferably. 5-30%.

In addition, the fiber orientation in the 1st protrusion part 11 and the 2nd protrusion part 12 arranges in the longitudinal direction of a nonwoven fabric, when manufacturing by web formation by a general card method, and nonwoven fabric formation by manufacturing methods, such as an air-through. The fiber has such an orientation angle, and the orientation strength can be in the range of 1 to 1.7 depending on the purpose. That is, when the fiber orientation is strong (orientation strength is high), the fiber array vector is oriented in the orientation angle direction. That is, since more fibers are oriented in the orientation angle direction, the behavior during processing is easily stabilized. Conversely, when the fiber orientation strength is low, the fiber direction is dispersed. Generally, the strength ratio in the longitudinal direction and the width direction approaches 1, and the strength can be balanced. Usually, since the fibers are crimped from the viewpoint of easy entanglement of the fibers, the nonwoven fabric tends to have random orientation while being arranged in the longitudinal direction, and has an orientation angle of about 0 ° ± 50 ° with respect to the longitudinal direction. Show.
On the other hand, the wall 13 of the surface sheet 1 in the present invention is not related to the fiber orientation angle of the first and second protrusions 11 and 12, or the fiber orientation angle of the first and second protrusions 11 and 12. From the above, the angle is greatly changed, and the orientation in the direction of the second projecting portion 12 is exerted.

Next, a preferred planar arrangement example of the first and second protrusions 11 and 12 will be described with reference to FIGS. 2 and 3.
As shown in FIG. 2, the first arrangement example includes the first and second projecting portions 11 and 12 over the entire surface sheet 1 as different directions intersecting in plan view over the entire surface sheet 1. They are alternately and continuously arranged in the direction X and the second direction Y, respectively. The crossing angle between the first direction X and the second direction Y is preferably 30 ° to 90 ° (orthogonal), and the illustrated example is 90 °. The ridge 14 is formed between the adjacent first protrusions 11.

  The arrangement of the first and second protrusions 11 and 12 is not limited to the configuration shown in FIG. For example, as shown in FIG. 3, six first protrusions 11 are arranged at the apexes of a hexagon around the second protrusion 12, and the pattern configuration is arranged in the entire area of the surface sheet 1. May be. In this case, since the number of the first protrusions 11 exceeds the number of the second protrusions 12, the first protrusions 11 are adjacent to each other. Such an arrangement is also arranged alternately and continuously in each of the first direction X, the second direction Y, and the third direction W as different directions intersecting in plan view. It is included in the meaning that the second protrusions 12 are arranged “alternately”.

The topsheet 1 having the first and second projecting portions 11 and 12 arranged as described above does not have a bent portion, and is composed of a continuous curved surface as a whole.
Thus, it is preferable that the said surface sheet 1 has the structure continuous in the surface direction. This “continuous” means that there are no intermittent portions or small holes. However, fine holes such as gaps between fibers are not included in the small holes. The small hole can be defined, for example, as a hole having a diameter equivalent to a circle of 1 mm or more.

Next, a preferred configuration example of the absorber 3 will be described with reference to FIG. 4 and FIG.
The absorbent body 3 includes a continuous second basis weight portion 32 and a first basis weight portion 31 having a higher basis weight than that, and the first basis weight portion 31 is surrounded by the second basis weight portion 32. Yes. Moreover, it has the groove-shaped recessed part 33 extended in the at least longitudinal direction which is dented from the back surface sheet 2 side to the surface sheet 1 side, and makes the 2nd basic weight part 32 into a bottom face. The concave portion 33 is disposed on the back sheet 2 side opposite to the top sheet 1 side of the absorber 3, and the adjacent first and second projecting portions 11 and 12 and the concave portion 33 form the absorber 3. Are arranged at positions facing each other. The second basis weight portion 32 is disposed so as to surround the first basis weight portion 31, and a groove-shaped recess 33 is disposed on the back sheet side of the second basis weight portion 32 between the first basis weight portions 31. . Therefore, the absorbent body 3 is configured such that the first basis weight portion 31 is thicker than the second basis weight portion 32. And the surface of the absorber 3 on the top sheet 1 side (the upper side in the drawing) is substantially flat. Further, the first basis weight portion 31 has a higher density than the second basis weight portion 32. Although the preferable range of the density is not particularly limited, the first basis weight portion 31 is 0.03 to 0.50 g / cm ³ , more preferably 0.05 to 0.40 g / cm ³ , still more preferably 0.00. The range is from 07 to 0.30 g / cm ³ , and the second basis weight portion 32 is from 0.01 to 0.15 g / cm ³ , more preferably from 0.03 to 0.12 g / cm ³ .

  Thus, since the recessed part 33 is distribute | arranged to the absorber 3 from the back sheet 2 side on the opposite side to the surface sheet 1 side, the liquid supplied to the surface of the surface sheet 1 is from 2nd protrusion part 12. FIG. It transfers to the internal space 11S of the 1st protrusion part 11, and is absorbed by the absorber 3 from the surface sheet 1 side. And it is guide | induced to the recessed part 33 from the 2nd basic weight part 32 through the 1st basic weight part 31 wall surface directly from the 2nd basic weight part 32 of the absorber 3, and transfers to the recessed part 33. Thus, the liquid once led to the second basis weight portion 32 is absorbed in a certain amount there, and the portion that cannot be absorbed further moves to the recess 33. If the concave portion 33 is disposed on the surface sheet 1 side, the liquid moves directly to the concave portion, and the liquid that does not enter the concave portion overflows and causes leakage. Therefore, it is desirable that the concave portion 33 is disposed on the side opposite to the top sheet 1.

  Further, the surface of the absorber 3 on the surface sheet 1 side is flat, and thus the second top portion 12T and the absorber 3 are formed even if the surface sheet 1 has irregularities due to the first and second protrusions 11 and 12. Since contact can be ensured, the adhesiveness to the top sheet 1 by a hot melt adhesive (not shown) is improved. Since this hot melt adhesive is applied in a spiral shape, for example, so as to provide a coating surface with a gap, the liquid transfer from the second protruding portion 12 to the absorber 3 is inhibited by the adhesive. Absent. Further, by using a hot melt adhesive that creates a coated surface with a gap, the integrity of the topsheet 1 and the absorbent body 3 is maintained and the followability is improved, and the strength of adhesion to the second projecting portion 12 is reduced. Since it is partially disposed, the softness of the absorbent article can be maintained. In addition, adhesiveness can be evaluated by the peeling strength between sheets, and this peeling strength is preferably 0.1 to 50 cN, and more preferably 0.5 to 10 cN. If the peel strength is lower than 0.1 cN, it is difficult for the liquid to move from the topsheet 1 to the absorber 3 when absorbing a small amount, and if the peel strength is higher than 50 cN, the apparent thickness of the topsheet 1 tends to decrease and absorbs a large amount. The effect of time becomes difficult to play.

  Furthermore, since the 1st basic weight part 31 is a high density compared with the 2nd basic weight part 32, there exists a transfer of the liquid from the 2nd basic weight part 32 to the 1st basic weight part 31, There is little transfer of the liquid from the basic weight part 31 to the 2nd basic weight part 32. FIG. Therefore, the liquid absorbed in the first basis weight portion 31 is difficult to return. That is, the liquid retention is increased.

Next, a preferable example of the arrangement of the grooves constituted by the concave portions of the absorber 3 will be described with reference to FIG.
As shown in FIG. 5 (1), the first and second groove-shaped recesses 33 extending at least in the longitudinal direction are provided on the back surface side of the absorbent body 3 opposite to the surface sheet 1 (see FIG. 1) side. The third recesses 33A, 33B, and 33C are provided.

  Specifically, the absorber 3 is composed of three parts in the longitudinal direction L thereof. 1st absorption part 3A divided into the middle part, 2nd absorption part 3B arranged on one side of this 1st absorption part 3A, and 3rd absorption part 3C arranged on the other side of 1st absorption part 3A And have. Accordingly, the first absorption part 3A is arranged between the second absorption part 3B and the third absorption part 3C. In addition, the outer shape of the absorbent body 3 may be a rectangle, but more preferably, the width direction D (hereinafter referred to as the width direction D is the above) so as to fit the thigh portion of the wearer's thigh. (Referred to as a direction orthogonal to the longitudinal direction L)). In addition, the 1st, 2nd, 3rd absorption part 3A, 3B, 3C only displayed the area | region of the absorber 3 by division, and is not what is isolate | separated by each absorption part. Further, when the absorbent body 3 is worn by being attached to, for example, an absorbent article of a diaper, the first absorbent part 3A is arranged on the crotch part, for example, the second absorbent part 3B is arranged on the ventral side, and the third absorbent Part 3C is arranged on the back side. Or the 2nd absorption part 3B is arranged on the back side, and the 3rd absorption part 3C is arranged on the ventral side.

  A plurality of (two in the illustrated example) first recesses 33A are mainly arranged in the first absorption portion 3A, and each first recess 33A is mainly located inside the side periphery of the first absorption portion 3A in plan view. It is arranged in the longitudinal direction L. Here, “a plurality of first recesses 33 </ b> A are mainly arranged in the first absorption portion 3 </ b> A” means that in addition to the case where only the first recesses 33 </ b> A are arranged in the first absorption portion 3 </ b> A, the second recesses 33 </ b> A are arranged. It means that the case where 33B and the 3rd recessed part 33C are partially arranged is included. Further, “mainly arranged in the longitudinal direction L” means that not only the arrangement in only the longitudinal direction L but also the arrangement in a part of other directions is included. In addition, the second and third recesses 33B and 33C are mainly arranged in each of the second and third absorption portions 3B and 3C, and each of the second and third recesses 33B and 33C is mainly in the longitudinal direction L. It is arranged in an oblique direction. Here, “the second and third recesses 33B and 33C are mainly arranged in each of the second and third absorbers 3B and 3C” means that only the second and third recesses 33B and 33C are arranged. In addition to the case where it is, it is the meaning also including the case where the 1st recessed part 33A is partially arranged. “Mainly arranged in an oblique direction” means that it may be partially arranged in other directions, and as a specific example of the oblique direction, it is arranged in an oblique lattice shape. Therefore, the first recess 33A and the second and third recesses 33B, 33C are different in the arrangement of the recesses.

  In addition, a part of the first recess 33A may be disposed in a part of the second and third absorption parts 3B and 3C. For example, depending on the setting position of the boundary between the first and second absorbing parts 3A and 3B, a part of the second recessed part 33B is arranged in a part of the first absorbing part 3A, or the first recessed part 33A Is partly disposed in a part of the second absorber 3B. The same applies to the third absorber 3C. In this manner, the arrangement relationship of the recesses with respect to each absorbing portion varies depending on the set position of the boundary between the first absorbing portion 3A and the second and third absorbing portions 3B and 3C.

Further, the first and second recesses 33A and 33B and the first and third recesses 33A and 33C are formed as continuous recesses.
The first to third recesses 33A to 33C are not particularly limited in cross-sectional shape, but have a rectangular or inverted trapezoidal shape. In addition, since the absorber 3 is comprised with aggregates, such as a fiber like a nonwoven fabric, the outline of the cross-sectional shape of each recessed part is not decided, but is an approximate shape.

Further, as shown in FIG. 5 (2), the absorbent body 3 has a plurality of absorbent bodies 3 (four in the illustrated example) in the first absorbent portion 3A in the absorbent body 3 having the arrangement shown in FIG. 5 (1). The first concave portion 33A is mainly arranged, and the fourth concave portion 33h connected to the first concave portion 33A arranged in the longitudinal direction L is arranged in the width direction D of the first absorbing portion 3A. Therefore, the recesses are arranged in a so-called ladder lattice by the first recesses 33A and the fourth recesses 33h. Other components are the same as those of the absorbent body 3 shown in FIG. In this case, the liquid transfer quickly proceeds to the outer concave portion, and the liquid transfer can be performed in a wider range. Therefore, the amount of liquid absorption increases and the time until absorption is shortened.
Note that 33A and 33h belonging to the first absorption portion 3A may be arranged in a ladder shape (the first basis weight portion 31 is staggered) or arranged in a lattice shape (the first basis weight portion 31 is a grid shape). You may do it. Further, the second recesses 33B and the third recesses 33C belonging to the second absorber 3B and the third absorber 3C may be omitted or may be intermittent (discontinuous). Further, it may be parallel or perpendicular to the longitudinal direction L. In addition, each of the plurality of first recesses 33A, second recesses 33B, and third recesses 33C belonging to the first absorption unit 3A may have the same width or different widths.

Next, the effects of the absorbent article of the present invention will be described below by taking the above preferred embodiment as an example. First, the liquid movement when the liquid is supplied onto the top sheet 1 will be described with reference to FIG.
As shown in FIG. 6, when the amount of the supplied liquid 51 (indicated by an arrow in the drawing) is small, the liquid 51 travels along the wall surface of the internal space 12 </ b> S of the second protrusion 12 and from the top 12 </ b> T of the second protrusion 12. It is assumed that the liquid 51 moves to the absorber 3 side and the liquid 51 moves from the second basis weight part 32 having a low basis weight of the absorber 3 to the first basis weight part 31 having a high basis weight.

  Further, when the amount of liquid supplied is large, as shown in FIG. 7A, the liquid 51 from the top 12T of the second protrusion 12 does not flow out in time, and the second protrusion 12 has an internal space 12S. Liquid 51 accumulates.

  Then, as shown in FIG. 7 (2), the accumulated liquid 51 is between the fibers that are oriented in the direction connecting the top portion 12T and the opening portion 12H from the inside space 12S of the second projecting portion 12 by the fluid pressure. It can flow into the internal space 11S in the 1st protrusion part 11 instantly. In addition, since the amount of fibers in the wall portion 13 is smaller than that of the top portions 11T and 12T, it is considered that when the wall portion 13 is subjected to such a hydraulic pressure that the liquid 51 is accumulated in the second projecting portion 12, the space between the fibers is likely to expand. .

  And as shown in FIG.7 (3), since there is much quantity of the liquid 51 which flows in instantaneously from the internal space 12S to the internal space 11S, the basic weight of the absorber 3 distribute | arranged to the surface sheet 1 side is low. Since the amount of liquid that can be absorbed by the second basis weight portion 32 and the amount of liquid that can be transferred from the second basis weight portion 32 to the first basis weight portion 31 having a high basis weight are momentarily exceeded, excess liquid 52 is generated. This surplus liquid 52 accumulates in the recess 33 along the wall surface of the first basis weight portion 31. Since the recess 33 has the liquid-impermeable back sheet 2 on the opening side (the lower side in the drawing), even if the opening side of the recess 33 faces downward, the liquid 51 is accumulated in the recess 33 without leaking, It is diffused over a wide range of the absorber 3 through the recess 33.

  In the present invention, the adjacent first and second projecting portions 11 and 12 and the concave portion 33 are disposed at positions facing each other via the absorber 3, so that the interior of the first projecting portion 11 The liquid 51 that has moved to the space 11 </ b> S easily passes through the second basis weight portion 32 of the absorber 3 and moves to the recess 33. That is, since the pitch between the first and second projecting portions 11 and 12 (between the first and second top portions 11T and 12T) is narrower than the concave portion 33 of the absorbent body 3, the first and second The second protrusions 11 and 12 are necessarily arranged. As a result, the liquid supplied to the inside of the first protrusion 11 can be quickly transferred to the recess 33. Then, the liquid 51 (excess liquid 52) transferred to the concave portion 33 is diffused in the wide range of the absorber 3 through the concave portion 33 and is absorbed by the absorber 3.

When the amount of liquid to be supplied is larger, as shown in FIG. 8, the liquid 51 accumulates directly in the lower concave portion 33 from the second basis weight portion 32 having a low basis weight as the liquid 51 moves as described above. Is expected to migrate. At this time, the 2nd basic weight part 32 may dent to the recessed part 33 side with a hydraulic pressure. Then, the liquid 51 accumulated in the concave portion 33 is diffused in the wide range of the absorber 3 through the concave portion 33 and absorbed by the absorber 3.
As described above, the liquid 51 supplied onto the top sheet 1 quickly moves from the internal space 11S to the absorber 3 through the top sheet 1, and is diffused and absorbed.
Therefore, since the transfer of the liquid 51 on the top sheet 1 is suppressed, side leakage can be prevented. Even when a large amount of the liquid 51 is supplied, the liquid 51 enters the internal space 11S in the first protrusion 11 that becomes the second surface (back surface) side Z2 of the topsheet 1 from the second protrusion 12. Since the transition proceeds quickly, it becomes difficult for the liquid to remain on the first surface (front surface) side Z1 of the topsheet 1, so that the feeling of stickiness of the skin can be reduced.
Further, even if the density of the top portion 12T of the second protrusion 12 is higher than that of the wall portion 13, when the liquid 51 is supplied in a large amount, it is difficult to leak from the top 12T. It becomes easy to temporarily store the liquid 51 in the space 11S. Moreover, since the density of the top part 12T is higher than the wall part 13, there also exists an advantage that the top parts 11T and 12T are hard to be crushed.

  Below, this invention is demonstrated further in detail based on the Example and comparative example of the absorptive article of the above-mentioned 1st Embodiment. The present invention is not limited to these examples.

As an example of the absorbent article in the present invention, evaluation was performed using a pants-type wearing article 100 shown in FIG. The pants-type wearing article 100 includes an absorbent main body 4 including a top sheet, a back sheet, and an absorbent body disposed therebetween, and a belt-like body 111 serving as an exterior body 111 extending in the waist direction in the front and rear end regions of the absorbent main body 4. The stretchable sheet is fixed, and the belt-like stretchable sheet is partially joined by a heat seal method or an ultrasonic seal method. Details of the pants-type wearing article 100 will be described later.
The absorptive main body 4 has a substantially hourglass-shaped external shape having a length of 450 mm, a front end width of 180 mm, a rear end width of 160 mm, and an intermediate portion (a central region that becomes a crotch portion when mounted) having a width of 120 mm. A back sheet is extended to at least the side of the absorbent body 3 shown in FIG. 5, and an elastic material is arranged directly or as a different sheet material in the extended portion so as to express a leakage prevention function. In order to obtain a diaper having the form shown in FIG. 9, a plurality of thread-like elastic members are arranged in the width direction between the spunbonded nonwoven fabrics as belt-like stretchable sheets at the front and rear end portions (corresponding to 3B in FIG. 5) of the absorbent main body portion. By using the composite sheet material, it is possible to reduce or lose the expansion / contraction function by the rigidity of the elastic member by cutting and fixing at the fixing portion (overlapping portion) with the absorbent main body 4.
Various evaluations to be described later were performed using the absorbent main body in a state where the side elastic function of the absorbent main body was lost by cutting or removal.

[Example 1]
As shown in FIG. 2, the top sheet 1 is provided with the first protrusions 11 and the second protrusions 12, and the pitch between the first protrusions 11 and the second protrusions 12 is 4 mm. It was. This topsheet 1 is formed into a concavo-convex nonwoven fabric by an air-through method in which a web is formed into a concavo-convex shape in a web state after the carding step and hot air treatment is performed. The fibers used were Daiwabo NBF (SH) fibers (2.2 dtex × 51 mm) that had been surface treated with a hydrophilic fiber oil.
For the back sheet 2, a polyethylene permeable sheet of 18 g / m ² was used.
The absorbent body 3 is the one shown in FIG. 5 (2), and has a pulp having a shape in which a first basis weight portion 31 which is a rectangular high basis weight portion is arranged in a ladder lattice shape and an absorptivity. The polymer is placed in a mixed state, and the spiral hot-melt pressure-sensitive adhesive is sandwiched between two sheets of 16 g / m ² absorbent paper so as not to overlap each other from the top sheet 1 side and the back sheet 2 side. The one adjusted to the desired thickness was used.
And the surface sheet 1 and the back surface sheet 2 were integrated with the hot-melt adhesive of this absorber 3, and the sample for evaluation was produced. In addition, the width | variety (the width | variety (bottom part) of the recessed part extended in a longitudinal direction) of the 2nd basic weight part 32 which is a low basic weight part was 5 mm in both.

[Example 2]
Example 2 is the same as Example 1 except that the shape of the absorbent body is a shape in which the second basis weight part 32 that is two low basis weight parts extends in the longitudinal direction shown in FIG. It was prepared.
[Example 3]
In Example 3, the width of the low basis weight portion is 10 mm in the shape in which the second basis weight portion 32 that is two low basis weight portions extends in the longitudinal direction shown in FIG. Example 4 was made in the same manner as Example 2 except that [Example 4]
In Example 4, the shape of the absorber is the shape shown in FIG. 3 for the topsheet used, and the pitch between the first protrusion 11 and the second protrusion 12 (the pitch between the first top 11T and the second top 12T) is 7. It was 5 mm. Other than that was produced like Example 2. FIG.

[Comparative Example 1]
The top sheet 1 was made by using a Daiwabo NBF (SH) fiber (2.2 dtex × 51 mm) which was surface-treated with a hydrophilic fiber oil in the same manner as in Example 1, and was produced through a carding step and an air-through step. Air through nonwoven fabric was used. As the back sheet 2, a 18 g / m ² moisture-permeable sheet made of polyethylene was used. Absorbent body 3 was prepared in the same form and procedure as in Example 1, with a commonly used pulp and absorbent polymer arranged in a mixed state and having a flat (flat) shape without grooves. Thereafter, the top sheet 1 and the back sheet 2 were integrated with the hot melt adhesive of the absorber 3 to prepare a sample for evaluation.
[Comparative Example 2]
In Comparative Example 2, a three-dimensionally-opened nonwoven fabric (groove-shaped openings) disclosed in JP-A-8-302555 was used as the surface sheet 1 for the surface sheet 1 of Comparative Example 1. The aperture width was 53 mm (21 rows of apertures). Other than that was the same as Comparative Example 1.

  Next, a measurement method and an evaluation method will be described.

<Appearance thickness T1 of surface sheet>
The three apparent thicknesses T1 in the surface sheet can be measured by observing the cross-sectional state of the portion extending from the first top to the second top. Before cross-sectional observation, using a handy compression tester KES-G5 (trade name) manufactured by Kato Tech Co., Ltd., 5 thicknesses at 0.5 g / cm ² are measured, and the average value, maximum value, and minimum value are measured. Got the value. A measurement program was used for measurement, and the measurement conditions were set as follows.
Sample: paper / film,
SENS: 1,
Measurement load: 10 g / cm ²
Measurement upper limit load: 50 g / cm ²
SPEED RENGE: 0.02 cm / sec,
DEF sensitivity can be adjusted 2-20mm with the surface sheet.

  Next, the top sheet 1 was cut using a single blade (product number FAS-10) manufactured by Feather Safety Razor Co., Ltd. to form a cross section of the top sheet 1. Subsequently, the cut-out section is enlarged and observed using a scanning electron microscope (model number JCM-5100) manufactured by JEOL Ltd. The cross section is image data or printed matter, and the assumption line on the mounting surface side is drawn at the apex of the first top portion 11T and the assumption line on the absorber 3 side is drawn at the apex of the second top portion 12T that is parallel to the assumption line. The distance (the length between the hypothetical line and the hypothetical line from the hypothetical line) was measured, and the obtained measurement result was used as the apparent sheet thickness. The ridge portion 14 is specified from the observed enlarged cross section, and the apparent thickness and the cup height Hc of the top portions 11T and 12T are measured. The measurement is performed at three or more locations, and the case where the average value of the apparent sheet thickness is within the minimum value-maximum value obtained from the measurement by KES-G5 is effective.

<Measuring method of substantial thickness of surface sheet>
Similar to the apparent thickness of the sheet, it was measured by magnifying observation with the scanning electron microscope. When the first protrusion 11 is taken as an example, the substantial thickness is measured so that the sheet thickness on the skin contact surface side surface of the top portion 11T of the first protrusion 11 and the side surface of the back sheet 3 opposite thereto is minimized. The same applies to the second protrusion 12. About the wall part 13, since it is necessary to measure the curve part and diagonal direction line | wire of the top part from the top part 11T, it is the wall part 13 in the position of 1/3 height from the skin contact surface side in the cup height Hc. The skin contact surface of the wall portion 13 at a position 2/3 from the skin contact surface side at the cup height Hc when the normal direction on the skin contact surface side is measured as the actual thickness of the sheet A value obtained by averaging the values measured with the normal direction on the side as the sheet thickness is defined as the substantial thickness of the wall portion 13. The position of the height of 1/3 and 2/3 on the surface sheet is specified by connecting the enlarged images so that the first protrusion portion 11 and the second protrusion portion 12 of the surface sheet 1 become one image data. The measurement position can be specified from the whole image of the first protrusion 11 and the second protrusion 12 and the substantial thickness can be specified by the enlarged image.

<Distance between fibers>
The interfiber distance in the first top portion 11T and the wall portion 13 was measured by enlarging it into a planar image using the scanning electron microscope. In the 1st top part 11T, it expanded in the normal line direction from the surface sheet 1 side surface, and in the wall part 13, 1/3 position of cup height Hc was expanded from the diagonal surface sheet 1 side direction (normal direction of the wall part 13). In the measurement, the magnification was set to 50 to 300 times, and the number of measurement by image analysis was adjusted to 20 to 60, preferably 30 to 50 in a region surrounded by fibers in a rectangular range. In the present invention, measurement was performed in an actual measurement range of 700 μm × 500 μm. In the image analysis, an actual measurement of 0.5 mm ² or less is removed from the number measurement and the inter-fiber distance measurement as a fine inter-fiber structure. For image analysis, Image-Pro plus 6.2 Installation manufactured by Roper Co., Ltd. was used, and a value corresponding to the diameter of the circle was calculated from the area between the individual fibers excluding the fibers, and was defined as the inter-fiber distance. Measurement and calculation were performed for the top portions 11T and 12T and the wall portion 13, and the average value was defined as the average interfiber distance. In measuring the distance between fibers, all measurable fibers from the top sheet 1 side to the back sheet 3 side were targeted, but the outline of the fibers for specifying the region surrounded by the fibers was partially clear. When it was unclear as a whole, it was not considered as a fiber for measuring the distance between fibers, and the fiber as a whole was unclear. Further, when the binarization process was not sufficiently performed, the measurement was performed after correcting the image and the printed matter to a measurable state.
Moreover, the number ratio of 40 μm or more was calculated as a percentage from the measurement result of the interfiber distance.

<Fiber orientation>
The fiber orientation was obtained by enlarging the first top 11 and the wall 13 into a planar image in the same manner as the interfiber distance, and binarizing the image using image processing software NewQuube [trade name] manufactured by Nexus Corporation. Then, using Fiber Orientation Analysis 8.13 Single (software name) which is a fiber orientation analysis program, the orientation angle and orientation strength were measured from the binarized image. The measurement was performed at the same magnification for both the top portion 11 and the wall portion 13, and was performed in the measurement number range close to the measurement of the interfiber distance. In addition, when there are many parts where the outline of the fiber is unclear, the fiber part can be specified by the image analysis. Moreover, the measurement was performed by the adjacent wall part 13 in the direction (90 degree +/- 45 degree direction) orthogonal to MD direction of the surface sheet 1 in the 1st top part 11T. The measurement of the wall 13 is measured from the perpendicular direction of the wall surface of the top sheet as the vertical direction (orientation angle 90 °) connecting the first top portion 11T and the second top portion 12T, and the first top portion 11T is The MD direction of the topsheet 1 is the vertical direction (orientation angle 0 °).

<Absorber measurement method>
The thickness of the produced absorber 3 was measured using a non-contact type laser displacement meter (Laser head LK-G30, displacement meter LK-GD500 (trade name)) manufactured by Keyence Corporation. The measurement pressure was 2.5 g / cm ² , two or more samples were measured, and the average value was obtained.
Moreover, the absorber 3 which has the 1st basic weight part 31 and the 2nd basic weight part 32 is designed from the actual measurement of the width | variety of a recessed part (bottom part), and a whole image, The area ratio of a recessed part is measured with the said image analysis apparatus. Measured. Note that measurement by superimposing partial images is also possible.

<Measurement method of absorption performance (liquid diffusibility)>
A cylinder having an inner diameter of 35 mm is placed at the center in the longitudinal direction and the center in the width direction of the absorber 3, and the concentration is maintained as a liquid while maintaining the liquid so that the height from the position of the absorber 3 to which the liquid is injected is 10 mm. 40 g of physiological saline colored with 0.005% red No. 2 was injected. The bottom of the cylinder was provided with an acrylic plate (thickness 5 mm, length 250 mm, width 100 mm) with a size that could cover the entire product.
The diffusion area of the liquid 10 minutes after the injection was measured.
The diffusion area was measured by copying the colored portion of the absorber 3 on an OHP film and performing image analysis using Image-Pro plus 6.2 Installation manufactured by Roper Co., Ltd.
A measurement result shows that the utilization efficiency of the absorber 3 is so high that the diffusion area of a liquid is large.

<Measurement method of basis weight>
It calculated | required by cut | disconnecting the site | part (surface material, absorber, high basic weight part, low basic weight part) to measure to 10 cm x 10 cm, and measuring the mass of the site | part. In addition, it calculated | required by cut | disconnecting in 2x2 cm in the site | part which cannot be cut out to 10x10 cm.

<Density measurement method>
The density was determined by measuring the basis weight of the part to be measured by the above method and dividing by the thickness measured by the above method.

<Evaluation of adhesion between surface sheet and absorber>
Each of the evaluation samples was cut into a rectangular shape with a width central region of 50 mm and a longitudinal central region of 250 mm, and one longitudinal end portion was separated between the topsheet 1 and the absorber 2 over 50 mm. (Orientec Co., Ltd., RTA100 [trade name]) was used to measure the peel strength with the separated portion of the top sheet sandwiched between the upper chuck side and the separated portion of the absorber 3 and the back sheet sandwiched with the lower chuck side. The gap between chucks was 50 mm, and the measurement speed was 50 mm / min. The average of the peak values at the top five locations at the chuck interval of 60 mm to 160 mm was defined as the peel strength, the peel strength was 0.1 to 50 cN, and the adhesiveness was evaluated as ◯.

  Table 1 shows the measurement results and evaluation results for each of the above evaluation items.

<Effect of Example>
As is clear from the evaluation results shown in Table 1, the following results were obtained.
Examples 1-4 showed fiber orientation in the direction which connects the top part of a 2nd protrusion part, and its opening part, when the orientation angle of a wall part is 82-93 degrees.
Since Example 1 had a larger liquid diffusion area than Comparative Examples 1 and 2, it was found that the liquid could be absorbed in a wide range of the absorber 3 and the utilization efficiency was high. Further, the presence of the second basis weight portion 32 having a low basis weight in both the longitudinal and width directions in the crotch absorber 3 makes it easy to bend in both directions. As a result, the fit to the human body is enhanced. For example, when used as a napkin or diaper for night use with a large amount of excretion, the fit is enhanced even in a state where the amount of pulp and SAP is large and the thickness of the absorber 3 is thick. , I was able to reduce the sense of discomfort when wearing.
In Example 2, since the liquid diffusion area was larger than those in Comparative Examples 1 and 2, the utilization efficiency of the absorber 3 was further increased. For this reason, since it becomes difficult for the liquid to accumulate at the injection point site, the feeling of stickiness near the injection point is reduced, and side leakage can be prevented. Moreover, since the 2nd basic weight part 32 of the low basic weight of the absorber 3 of a crotch part is only a longitudinal direction, the absorber 3 is hard to break even in the daytime with many operations, for example, and the low basic weight is low in the width direction. The presence of the quantity part made it difficult to hinder the walking movement, leading to a reduction in the wearer's discomfort.
Since Example 3 had a larger liquid diffusion area than Comparative Examples 1 and 2, the utilization efficiency of the absorber 3 was further increased. Moreover, since the 2nd basic weight part 32 of the low basic weight of the absorber 3 of a crotch part is only a longitudinal direction and is a wide area, the diffusibility of the liquid in a groove part (concave part 33) increases more. As a result, the utilization efficiency of the absorber 3 is further improved, leading to a reduction in the amount of pulp and superabsorbent polymer (SAP) in the same leakage performance. Moreover, since there is little high basic weight area | region (1st basic weight part 31) of the absorber 3 in a crotch part at the time of wear, the discomfort at the time of operation | movement is reduced further. Therefore, it can be said that it is suitable for napkins for daytime and baby diapers at the age of high age with active activities.
In Example 4, since the apparent thickness of the topsheet 1 is thicker, the space between the absorbent body 3 and the skin is widened and it is difficult to feel stickiness. Therefore, it is considered that the dry feeling is improved by using it in a neutral position. From the above, it is considered suitable for daytime napkins and baby diapers at high ages with active activities.

Next, a preferred embodiment of the pant-type wearing article of the present invention will be described below with reference to the perspective view shown in FIG.
In the pant-type wearing article 100 of the present specification, the height direction of the pant-type wearing article is defined as the Y direction, and the width direction of the pant-type wearing article is defined as the X direction, which is also referred to as a “waist circumference direction”.

As shown in FIG. 9, the pant-type wearing article of the present embodiment is, for example, a pant-type diaper 100, and includes an abdominal side part 121 arranged on the wearer's belly side, and a crotch part 113 arranged on the crotch part. And a dorsal side portion 123 disposed on the dorsal side. Hereinafter, the pants-type diaper 100 will be described in detail.
The pants-type diaper 100 includes an exterior body 111 that forms an abdominal side portion 121 and a back side portion 123, and the absorbent main body 4 that forms a crotch portion 113.
In the exterior body 111, one side edge portion 121 </ b> A of the ventral side portion 121 and one side edge portion 123 </ b> A of the back side portion 123 are joined, and the other side edge portion 121 </ b> B and back side portion 123 of the ventral side portion 121 are joined. The one side edge portion 123B is joined to form an annular shape.
Moreover, the crotch part 113 is comprised by the absorptive main body 4 which bridge | crosses the abdominal side part 121 and the back side part 123, and is distribute | arranged to a wearer's crotch part. The absorbent main body 4 has a pant-type structure that spans an annular outer body 111 and a crotch part 113.
The absorbent main body 4 forms a crotch portion, and extends to the vicinity of the lower portion of the waist opening 112 of the exterior body 111 at the abdominal side portion 121 and the back side portion 123 and is fixed to the exterior body 111. Thereby, the exterior body 111 has the center area | region to which the absorptive main body 4 was fixed, and the both sides area | region which is not fixed in the waist area. The “waist circumference region” is a region between the position where the vicinity of the outer base of the thigh is arranged in the body length direction (Y direction) that is the direction from the upper edge of the waist opening 112 to the lower part thereof. Say.

  The exterior body 111 is configured by laminating an inner layer material 131 and an outer layer material 133, and a one-layer region where one layer of the inner layer material 131 exists is spaced in the height direction (Y direction) of the exterior body 111. Have more than one. In the drawing, the inner layer material 131 is present in one layer region, and the outer layer material 133 is stacked on the inner layer material 131 at intervals in the height direction of the exterior body 111.

  The laminated region where the inner layer material 131 and the outer layer material 133 are laminated has elasticity in the width direction (X direction) of the pant-type diaper 100. The laminated region may include an elastic body 135 between the inner layer material 131 and the outer layer material 133. In this case, the elastic body 135 is sandwiched between the inner layer material 131 and the outer layer material 133 in an expanded state, and thereby has elasticity. Alternatively, as will be described in detail later, both or one of the inner layer material 131 and the outer layer material 133 may be made of a stretchable material.

As a sheet as a material of the inner layer material 131 and the outer layer material 133, for example, non-woven fabric, woven fabric, knitted fabric, resin film by various manufacturing methods such as air-through nonwoven fabric, heat roll nonwoven fabric, spunlace nonwoven fabric, spunbond nonwoven fabric, melt blown nonwoven fabric, etc., respectively A sheet material obtained by stacking and integrating these can also be used.
In particular, the inner layer 131 is preferably formed from a nonwoven fabric from the viewpoint of improving air permeability and texture, and is formed of a water-repellent nonwoven fabric from the viewpoint of preventing excrement leakage. Is preferred.

  Since the pants-type diaper 100 uses the absorbent main body 4 of the absorbent article of the present invention for the crotch part 113, liquid leakage can be prevented and the feeling of skin stickiness can be reduced.

DESCRIPTION OF SYMBOLS 1 Top sheet 2 Back sheet 3 Absorber 11 1st protrusion part 12 2nd protrusion part 11H, 12H Opening part 11S, 12S Internal space 11T, 12T Top part 13 Wall part 31 1st basic weight part 32 2nd basic weight part 33 Concave part X 1st direction Y 2nd direction W 3rd direction Z1 1st surface side Z2 2nd surface side

Claims (6)

Having a top sheet disposed on the skin contact surface side, a back sheet disposed on the non-skin contact surface side, and an absorbent body interposed between the two sheets;
The top sheet protrudes on the first surface side on the liquid supply side and has an internal space; and a second protrusion portion protrudes on the second surface side opposite to the first surface side and has an internal space; The first and second protrusions are alternately and continuously arranged in different directions intersecting in plan view over the entire surface sheet, and the top of the second protrusion and the opening thereof There is a wall portion of an annular structure in between, the wall portion has fiber orientation in the direction connecting the top of the second protrusion and the opening,
The absorbent body has a first basis weight part and a second basis weight part having a lower basis weight and surrounding the first basis weight part, and is in contact with the top of the second protrusion of the topsheet. Arranged,
And having a groove-like recess extending in the longitudinal direction at least from the back sheet side to the top sheet side and having the second basis weight part as the bottom surface,
The absorbent article in which at least a part of the adjacent first and second projecting portions and the concave portion are arranged at positions facing each other through the absorbent body. The absorbent article according to claim 1, wherein the first basis weight part has a higher density than the second basis weight part. The absorbent article according to claim 1 or claim 2, wherein the wall portion has a smaller amount of fiber than the top portions of the first and second protrusions. The absorbent article according to any one of claims 1 to 3, wherein the top portions of the first and second projecting portions are higher in density than the wall portion. The absorbent article according to any one of claims 1 to 4, wherein the top of the second protrusion and the absorber are fixed by a hot melt material. The abdomen side part arranged on the abdomen side of the wearer, the crotch part arranged in the crotch part, and the back side part arranged on the back side, the side edge part of the abdomen side part and the back side part It is the underpants type wearing article joined to the side edge part, and the absorptive article according to any one of claims 1 to 5 is formed in the crotch part. Pants-type wearing articles that are arranged.

Images