JP6153291B2 - Disposable diapers - Google Patents

Description

The present invention relates to a disposable wearing article, and more particularly to a disposable diaper having an absorbent body having a relatively small mass per unit area of a core material .

Conventionally, a wearing article provided with an absorber in which the mass per unit area of the core material is reduced is known. As such a wearing article, for example, Patent Document 1 discloses a disposable diaper having an absorbent body made of a core material such as pulp and having a reduced core mass. By reducing the mass per unit area of the core material, the absorber can be thinned and provided with sufficient flexibility. Such a core material with a small mass has reduced absorption performance, but by forming a hole penetrating in the thickness direction of the core material, the absorption area of the absorber is increased and the absorbability in the absorber is improved. be able to.

JP 2002-35036 A (JP2002-35036A)

When the absorber described in Patent Document 1 as described above is used for a diaper, a liquid-permeable inner sheet is laminated on the absorption surface of the absorber. In the portion where the hole is formed in the absorber, the inner sheet and the absorber do not come into contact with each other, so that body fluids such as urine are not easily transferred to the absorber and are likely to stay on the inner sheet by being widely diffused in the inner sheet. Body fluid such as urine staying on the inner sheet wets the wearer's skin, which may cause discomfort and rash.

An object of the present invention is to provide a disposable diaper in which the absorbent body is thin and has flexibility, the absorbability is not lowered, and body fluid can be quickly transferred to the absorbent body.

The present invention has a longitudinal direction and a lateral direction, and has a skin facing surface and a clothing facing surface which is a surface on the opposite side, a front and rear waist region, a crotch region located between these front and rear waist regions, and the skin facing surface The present invention relates to a disposable diaper including an inner sheet positioned on a surface, an outer sheet positioned on the non-skin facing surface, and an absorber positioned between the inner and outer sheets and at least in the crotch region.
The features of the present invention in this diaper are as follows. That is, the inner surface sheet has a front surface and a flat rear surface that form the skin facing surface, and the front surface and the groove portion are alternately arranged in the horizontal direction and extend in parallel in the vertical direction on the surface. And are formed. On the front surface of the inner surface sheet, the first imaginary belt that obliquely intersects the flange portion and the groove portion and extends in parallel with each other, and intersects the flange portion and the groove portion obliquely. A plurality of pressing recesses are formed in a plurality of second virtual bands that obliquely intersect each of the virtual bands and extend in parallel with each other. The compression recess is a first recess formed in a thickness direction of the inner surface sheet, which is recessed from the front surface to the back surface of the inner surface sheet, and the first virtual band and the second virtual band intersect with each other. Between the first pressing recesses that are adjacent to each other in the pressing recess, and in either the first virtual zone or the second virtual zone, a part is included in either the first virtual zone or the second virtual zone A second pressing recess and a third pressing recess that is between the adjacent first pressing recesses and is entirely included in either the first virtual zone or the second virtual zone. It is out.

The inner sheet of the diaper according to the present invention includes a flange portion and a groove portion that extend in parallel to each other in the vertical direction, a plurality of first virtual bands that obliquely intersect with these portions and extend in parallel with each other, and both these portions, It has a plurality of second virtual bands that intersect diagonally and extend obliquely with the first virtual band. In the first and second imaginary belts, the squeezed portions formed by squeezing the inner surface sheet from the front surface toward the back surface are distributed so as to be located in the collar portion and the groove portion, respectively. The pressing part in the buttocks is a high-density part in the buttocks, the pressing part in the groove part is a high-density part in the groove part, and the body fluid that diffuses and spreads in the vertical direction on the surface of the inner sheet is the buttocks In both the groove portion and the groove portion, they are gathered in the compressed portion having a high density and do not spread in the vertical direction.

The figure which connected the front-and-rear waist area of the disposable diaper which concerns on this invention . The partially broken top view seen from the skin opposing surface of the expanded diaper. The exploded perspective view of a diaper. The IV-IV line expanded sectional view of FIG. The enlarged view of the part V in FIG. The expansion perspective view of an inner surface sheet.

Referring to FIG. 1, a diaper 1 according to the present invention has a longitudinal direction Y and a lateral direction X, and a front waist region 11 and a rear waist region 12, and a crotch region 13 located between these front and rear waist regions 11, 12. And front and rear end edges 14 and 15 extending in the horizontal direction X, and both side edges 16 extending in the vertical direction Y. The diaper 1 connects the front and rear waist regions 11 and 12 and the crotch region 13 to the wearer by detachably connecting a hook element 81 attached to the rear waist region 12 and a loop element 82 attached to the front waist region. Can be adhered to.

2 and 3, the diaper 1 has a virtual vertical center line 2-2 that bisects the dimension in the horizontal direction X , and is substantially symmetric with respect to the virtual vertical center line 2-2 . .
The diaper 1 includes a liquid-permeable inner surface sheet 20 that forms a skin facing surface , a liquid-impermeable outer surface sheet 30 that forms a non-skin facing surface, that is, a clothing facing surface, on the opposite side, and these inner and outer surface sheets 20. , 30 and a leak-proof sheet 50 located between the absorbent body 40 and the outer sheet 30. A pair of containment sheets 60 that are spaced apart in the lateral direction X are formed on the skin facing surface of the inner surface sheet 20. These sheets are joined to each other by an adhesive means such as a hot melt adhesive (not shown).

As the outer surface sheet 30, a hydrophobic spunbond / meltblown / spunbond (hereinafter referred to as SMS) fiber nonwoven fabric , spunbond fiber nonwoven fabric, plastic sheet, or a fiber nonwoven fabric and a plastic having a mass of about 10 to 30 g / m ² A laminate of sheets can be used. A loop element 82 constituting the fastening system is attached to the front waist region 11 on the non-skin facing surface of the outer sheet 30.

  A leakage prevention sheet 50 is bonded to the outer sheet 30. The leak-proof sheet 50 can be a liquid-impervious and breathable plastic film. The leak prevention sheet 50 has an area larger than that of the absorber 40 and prevents urine or the like absorbed by the absorber 40 from leaking out of the diaper 1. A hook element 81 constituting the fastening system is attached to the rear waist region 12 via the tab sheet 83 on the outer surface sheet 30. The tab sheet 83 is fixed between the containment sheet 60 and the outer sheet 30, and extends in the lateral direction X from both side edges 16, and a hook element 81 is attached to the extended portion.

  A leg elastic body 51 is fixed to the inner surface of the outer sheet 30 along both side edges 33. The leg elastic body 51 is fixed between the containment sheet 60 and the outer sheet 30 so as to be contractable in an extended state. As the leg elastic body 51, a plurality of string-shaped or strand-shaped elastic bodies can be used. Due to the contracting action of the leg elastic body 51, both side edges of the diaper 1 have a gasket function.

The absorbent body 40 is bonded to the inner surface of the leakage prevention sheet 50. The absorber 40 is located at least in the crotch region 13 and extends from the crotch region 13 to the front and rear waist regions 11 and 12 in this embodiment. The absorber 40 includes a liquid-absorbing core material 41 and a covering sheet 42 such as tissue paper that covers the core material 41. As the core material 41, fluff pulp, superabsorbent polymer particles, or a mixture thereof can be used. The core material 41 has a dimension in the lateral direction X in the crotch region 13 smaller than that in the front and rear waist regions 11 and 12. The core material 41 includes at least fluff pulp having a mass per unit area of about 150 to 250 g / m ^{2. In} this embodiment , the superabsorbent polymer particles having a mass per unit area of about 150 to 250 g / m ² And the mass of the core material is reduced as compared with the conventional disposable diaper. When the mass of the core material 41 increases, the rigidity increases and the flexibility of the entire diaper 1 is impaired. However, by reducing the mass, the flexibility of the absorbent body 40 can be maintained, and the diaper 1 as a whole A supple feel can be achieved.

  Referring to FIG. 4, the absorber 40 has an absorption surface 43 located on the inner sheet 20 side and a bottom surface 44 located on the opposite side and located on the outer sheet 30 side. The absorber 40 is provided with a plurality of recesses 45 from the bottom surface 44 toward the absorption surface 43. The absorption surface 43 is not provided with the recess 45, and is substantially flat. The recess 45 can be formed by pressurizing and heating the absorber 40 from the bottom surface 44 toward the absorption surface 43. By providing the recess 45, the area where the core member 41 can absorb urine and the like on the bottom surface 44 can be increased. Since the mass of the core material of the absorbent body 40 is relatively small, the amount of absorption of bodily fluids such as urine may be reduced by that amount, but by providing the recess 45, the area that can absorb bodily fluids is increased. And since the area can be used effectively, even if it is an absorber with a small mass of a core material, sufficient absorption capability can be maintained.

  Since the mass per unit area of the core material 41 of the absorbent body 40 is reduced, the core material 41 is easily moved by the movement of the wearer's legs, etc., particularly in the crotch region 13, and the core material 41 is locally distributed. It tends to gather and become dense, or sparse around it. However, the core member 41 can be prevented from moving by providing the recess 45 in the absorber 40. In the recess 45, the core material 41 is pressurized, so the density of the core material 41 is higher than in other areas where the recess 45 is not provided. Therefore, the portion where the concave portion 45 is located has a high rigidity, and a difference in rigidity occurs between the other regions. Further, since the thickness of the concave portion 45 is reduced, the absorber 40 can be bent along the concave portion 45 in the vertical direction Y and the horizontal direction X so as to be in close contact with the wearer. Further, in the front and rear waist regions 11 and 12 where the recess 45 is not formed, the rigidity is lower than that of the region where the recess 45 is formed, and a supple texture can be realized. In the case where an assistant such as a mother wants an infant or the like to wear the diaper 1 with the diaper 1, the assistant often has the front and rear waist regions 11, 12 instead of the crotch region 13. The softness and softness of the diaper 1 can be realized.

  The area ratio of all the recesses 45 is about 2 to 10% of the area of the crotch region 13. The recess 45 has a dimension in the horizontal direction X of about 3 mm and a dimension in the vertical direction Y of about 1 mm, and extends in the horizontal direction X. The recess 45 adjacent to the lateral direction X has a spacing dimension of about 15 mm, and the recess 45 adjacent to the longitudinal direction Y has a spacing dimension of about 15 mm. The concave portions 45 adjacent to each other in the vertical direction Y are arranged so as not to overlap each other, and are arranged so as to draw a so-called staggered pattern by the plural concave portions 45. The diaper 1 is easy to bend along the concave portion 45, but when the concave portion 45 extends in the lateral direction X, the diaper 1 is easily bent so that the front and rear end edges 14 and 15 are brought closer to each other particularly in the crotch region 13. Therefore, the diaper 1 can be easily adhered to the wearer's crotch. Further, since the recess 45 extends in the horizontal direction X, it is difficult to bend along the virtual line extending in the vertical direction Y. Therefore, even when both side edges 16 of the diaper 1 are pressed inward in the lateral direction X by the wearer's thigh while the diaper 1 is worn, the absorber 40 can be prevented from being bent.

Referring to FIG. 3 again, the inner sheet 20 is joined to the absorbing surface 43 of the absorber 40. The inner sheet 20 has a surface 25 that forms a skin facing surface and a back surface 24 on the opposite side, and is laminated so that the back surface 24 faces the absorption surface 43 of the absorber 40. As the inner surface sheet 20, for example, a through-air fiber nonwoven fabric having a mass of about 15 to 35 g / m ^2, preferably about 25 to 30 g / m ² can be used.

  4 to 6, the inner surface sheet 20 has a central region 28 having a plurality of flange portions 26 and groove portions 27 on the surface 25 thereof, and is positioned outside the central region 28 in the lateral direction X. And flat side portions 29 where the groove portions 27 are not formed. The flange portions 26 and the groove portions 27 extend in the vertical direction Y and are alternately arranged in the horizontal direction X. The pitch of the collar part 26 and the groove part 27 shall be about 2-7 mm.

The flange portion 26 and the groove portion 27 of the inner surface sheet 20 can be manufactured by the following method. A fiber nonwoven fabric can be used as the inner sheet 20, and the fiber nonwoven fabric is formed by a card web in which staples are accumulated. The card web is placed on a traveling belt and conveyed in the machine direction, and jet air and jet heated from a plurality of nozzles provided at regular intervals in the crossing direction so as to cross the card web. Sprays fluid such as water and jet steam. In the card web on which the fluid is ejected, the staples partially move in the crossing direction, and the groove portion 27 is formed at the portion where the fluid is ejected, and the flange portion 26 is formed on both sides thereof. The fluid is ejected at a portion corresponding to the central region 28 and is not ejected at a portion corresponding to the both side regions 29. The inner sheet 20 manufactured in this way has a higher staple density in the collar portion 26 than in the groove portion 27.

5 and 6, the surface 25 is formed with a plurality of pressing recesses 70. The pressing recess 70 is configured by first to fourth pressing recesses 71 to 74, and the first pressing recess 71 is located at the intersection of the linear first virtual band 75 and the second virtual band 76. The distance between the side edges defining the first and second imaginary bands 75 and 76, that is, the width, is substantially the same as the diameter of the opening when the first pressing recess 71 is circular. At least the center of the second compressed recess 72 does not coincide with the centers of the first and second virtual bands 75 and 76, and a part of the second compressed recess 72 overlaps one of the first and second virtual bands 75 and 76 . The center of the third pressing recess 73 coincides with one of the first and second virtual bands 75 and 76. The fourth pressing recess 74 does not overlap the first and second virtual bands 75 and 76, and the dimension from the center of the first pressing recess 71 to the center of the fourth pressing recess 74 is the first pressing recess 71. Is smaller than the dimension from the center to the center of the second pressing recess 72, specifically about 1.8 mm . The first and second virtual bands 75 and 76 intersect with the virtual vertical center line 2-2 and are symmetric with respect to the virtual vertical center line 2-2.

On the first and second virtual bands 75 and 76, the first pressing recesses 71 are separated from each other by approximately 15 mm, and the second pressing recesses 72 positioned therebetween are spaced from each other by approximately 1 mm. The second pressing recess 72 is provided symmetrically with the first and second virtual bands 75 and 76. In this embodiment, the third pressing recess 73 located between and if the first pressing recess 71 is one, the first pressing recess 71 between the third pressing recess 73, a pair of second compressing recess 72 is provided. If the centers of the first pressing recess 71 and the second pressing recess 72 are linearly arranged on the first and second virtual bands 75 and 76, the inner surface sheet 20 is linearly recessed along these. The wearer's skin is stimulated by the contact of the linear dents with the wearer's skin. However, since the center of the 2nd pressing recessed part 72 does not correspond with the 1st and 2nd virtual bands 75 and 76 like this embodiment, between the 1st pressing recessed parts 71, the inner surface sheet 20 is 1st and There is no linear recess along the second virtual bands 75 and 76. In other words, since it dents so as to meander partially away from the first and second virtual bands 75 and 76, it is difficult to irritate the wearer's skin. In addition, it can give a soft impression to the eyes. Further, the inner sheet 20 as a whole is bent along the vicinity of the first and second imaginary bands 75 and 76, and the first and second imaginary bands 75 and 76 intersect with each other. It bends flexibly and easily adheres to the wearer's skin. Furthermore, by providing a plurality of the fourth pressing recesses 74 in the vicinity of the first pressing recesses 71, the fourth pressing recesses 74 give a soft impression without visually distinguishing the intersections of the first and second virtual bands 75 and 76. Can do. It is desirable that the fourth pressing recess 74 has a smaller diameter than the second and third pressing recesses 72 and 73 .

  The separation dimension of the first pressing recess 71 is the separation dimension of the adjacent first virtual band 75 and the separation dimension of the adjacent second virtual band 76. By relatively increasing these separation dimensions, the inner surface sheet 20 can be made to maintain a bulky and soft feel without making the thickness dimension of the inner surface sheet 20 unreasonably small.

  The pressing recess 70 is disposed so as to overlap both the flange portion 26 and the groove portion 27. When any of the compressed recesses 70 coincides with the flange portion 26, a part of the flange portion 26 is compressed in the thickness direction, and the thickness dimension is made smaller than the other portions. Similarly, when a pressing recessed part corresponds to the groove part 27, a part of groove part 26 is compressed in the thickness direction, and the thickness dimension is made smaller than another part. However, the amount of compression of the groove 26 is smaller than that of the flange 26.

  Since the bottom surface 24, which is a flat surface of the inner surface sheet 20, and the absorption surface 43, which is a flat surface of the absorber 40, face each other, the bottom surface 24 of the inner surface sheet 20 contacts almost the entire surface of the absorption surface 43. If a concave portion is formed on the absorption surface 43, the contact area between the absorption surface 43 and the bottom surface 24 is reduced, and the body fluid is less likely to move from the inner surface sheet 20 to the absorber 40. In the embodiment, this can be prevented, and body fluid can be prevented from accumulating on the inner surface sheet 20.

  The separation dimension of the first pressing recess 71 adjacent to the longitudinal direction Y is made larger than the separation dimension of the recess 45 adjacent to the longitudinal direction Y. By providing the recessed part 45 in the absorber 40, the rigidity becomes higher compared with the case where this is not provided, but the recessed part 45 is formed by increasing the separation dimension of the first pressing recessed part 71 of the inner surface sheet 20. It is possible to prevent the rigidity of the crotch region 13 from becoming excessively large in the entire crotch region 13.

The collar portion 26 of the inner surface sheet 20 has a higher staple density than the groove portion 27. The inner surface sheet 20 is formed with a pressing recess 70 that overlaps with each of the flange portion 26 and the groove portion 27, and the density of both the flange portion 26 and the groove portion 27 is further increased at the portion where the pressing recess 70 is formed. Therefore, the body fluid that diffuses and spreads in the longitudinal direction Y in the inner surface sheet 20 easily collects in the compressed portion 70 in both the flange portion 26 and the groove portion 27, and in particular, the body fluid easily collects in the compressed recess portion 70 of the flange portion 26. It can be suppressed that the body fluid moves from the vicinity of 70 to the absorber 40 and the body fluid spreads in the longitudinal direction Y in the inner surface sheet 20. The absorber 40 has the recessed part 45 in the bottom face 44, and the density of the core material 41 is high in the part in which the recessed part 45 is located. Therefore, the body fluid easily moves from the compressed recess 70 of the inner surface sheet 20 toward the recess 45 of the absorbent body 40, and the body fluid can be further prevented from remaining on the inner surface sheet 20. In this embodiment, the fiber nonwoven fabric in which the collar portion 26 and the groove portion 27 are formed as a single layer is used as the inner surface sheet 20. For example, a fiber nonwoven fabric in which the collar portion 26 and the groove portion 27 are not formed is laminated on the back surface side. It can also be used.

Referring to FIG. 3 again, in the inner sheet 20, the central region 28 overlaps the absorber 40, and both side regions 29 are located outside the lateral direction X of the absorber 40. A containment sheet 60 is attached to both side regions 29. As the containment sheet 60, an SMS fiber nonwoven fabric having a mass of about 10 to 30 g / m ² can be used. The front and rear end edges 61 and 62 of the containment sheet 60 coincide with the front and rear end edges 21 and 22 of the inner surface sheet 20 and are bonded to each other. Since the front and rear end edges 61 and 62 are bonded to the flat both side regions 29 of the inner sheet 20, they can be firmly bonded. The proximal edge 63 of the containment sheet 60 overlaps the side edges 33 of the outer sheet 30 and they are joined together. What was the distal edge 64 of the pair of containment seat 60, is spaced laterally X, these distal edge 64, overlaps the inner sheet 20 is not bonded to this, the inner sheet 20 Separable. A sleeve portion (not shown) is formed on the distal edge portion 64, and an elastic body 65 extending in the longitudinal direction Y is attached to the sleeve portion so as to be contractable in an extended state. By attaching the elastic body 65 in this manner, the distal edge portion 64 is separated so as to stand up from the inner surface sheet 20 and closely contacts the wearer's skin, thereby preventing urine and the like from leaking to the outside of the diaper 1.

  According to the diaper 1 as described above, by forming the recess 45 on the bottom surface 44 of the absorbent body 40, even if the absorbent body has a small mass per unit area of the core material 41, the absorbency is reduced. There is no. Moreover, since the flat absorption surface 43 in which the recessed part 45 is not formed and the inner surface sheet 20 face each other, the facing area is not reduced, and body fluid quickly moves from the inner surface sheet 20 to the absorber 40. In addition, body fluid can be prevented from staying on the inner surface sheet 20.

The disclosure relating to the present invention described above can be summarized at least in the following matters.
Specifically, the present invention relates to the following improved disposable diaper, which disposable diaper has a longitudinal direction Y and a lateral direction X, and a clothing facing surface that is a skin facing surface and its opposite surface, and front and rear waists. A region, a crotch region positioned between the front and rear waist regions, an inner surface sheet, an outer surface sheet, and an absorber positioned between the inner and outer surface sheets and at least in the crotch region.

The present invention is characterized by the following points in the disposable diaper. The inner surface sheet has a front surface and a flat rear surface that form the skin facing surface, and the front surface includes alternating ridges and grooves extending in the vertical direction and parallel to each other in the horizontal direction. It is formed. On the front surface of the inner surface sheet, the first imaginary belt that obliquely intersects the flange portion and the groove portion and extends in parallel with each other, and intersects the flange portion and the groove portion obliquely. A plurality of pressing recesses are formed in a plurality of second virtual bands that obliquely intersect each of the virtual bands and extend in parallel with each other. The compression recess is a first recess formed in a thickness direction of the inner surface sheet, which is recessed from the front surface to the back surface of the inner surface sheet, and the first virtual band and the second virtual band intersect with each other. Between the first pressing recesses that are adjacent to each other in the pressing recess, and in either the first virtual zone or the second virtual zone, a part is included in either the first virtual zone or the second virtual zone A second pressing recess and a third pressing recess that is between the adjacent first pressing recesses and is entirely included in either the first virtual zone or the second virtual zone. It is out.

The above invention can include at least the following embodiments.
(1) The inner surface sheet includes a fourth pressing recess, the fourth pressing recess is outside the first imaginary belt and the second imaginary belt, and the fourth pressing from the center of the first pressing recess. The dimension to the center of the recess is smaller than the dimension from the center of the first pressing recess to the center of the second pressing recess.
(2) The said compression recessed part is formed in the said collar part and the said groove part.
(3) The distance between the side edges defining the first and second imaginary bands is the same as the diameter of the opening when the first pressing recess is circular.
(4) The absorbent body has a flat absorbent surface facing the inner sheet and a bottom surface opposite to the absorbent surface, and has a plurality of recesses from the bottom surface toward the absorbent surface,
The recessed portion has a higher density of the core material than other regions where the recessed portion is not provided, and the plurality of compressed recessed portions in the inner surface sheet and the plurality of recessed portions in the absorbent body , Which overlap in the thickness direction are included.
(5) The said recessed part in the said absorber is formed only in the said crotch area, and the dimension in the said horizontal direction is larger than the dimension in the said vertical direction.
(6) The said core material contains the fluff pulp whose mass per unit area is 150-250 g / m < ² >.

In addition to the materials described in this specification, various known materials that are usually used in this kind of field can be used without limitation for the respective constituent members constituting the disposable diaper 1. In the specification of the present invention, the terms “first”, “second”, “third”, and “fourth” are used to simply distinguish elements , positions, and the like from each other .

DESCRIPTION OF SYMBOLS 1 Disposable diaper 11 Front waist area 12 Rear waist area 13 Crotch area 20 Inner surface sheet 24 Back surface 25 Front surface 26 Gutter part 27 Groove part 28 Central area 29 Both side area 30 Outer surface sheet 40 Absorber 41 Core material 43 Absorbing surface 44 Bottom surface 45 Concave 71 First 1 pressing recess 72 2nd pressing recess 73 3rd pressing recess
74 4th pressing recessed part 75 1st virtual zone 76 2nd virtual zone X Horizontal direction Y Vertical direction

Claims (7)

A clothing facing surface that is a skin facing surface and a surface opposite to the skin facing surface, a front and rear waist region, a crotch region positioned between the front and rear waist regions, an inner sheet, and an outer sheet And a disposable diaper including an absorbent body located between the inner and outer sheet and at least the crotch region,
The inner surface sheet has a front surface and a flat rear surface that form the skin facing surface, and the front surface includes alternating ridges and grooves extending in the vertical direction and parallel to each other in the horizontal direction. Formed,
On the front surface of the inner surface sheet, the first imaginary belt that obliquely intersects the flange portion and the groove portion and extends in parallel with each other, and intersects the flange portion and the groove portion obliquely. A plurality of squeezing recesses are formed in a plurality of second virtual bands that obliquely intersect with each of the virtual bands and extend in parallel with each other,
The compression recess is a first recess formed in a thickness direction of the inner surface sheet, which is recessed from the front surface to the back surface of the inner surface sheet, and the first virtual band and the second virtual band intersect with each other. Between the first pressing recesses that are adjacent to each other in the pressing recess, and in either the first virtual zone or the second virtual zone, a part is included in either the first virtual zone or the second virtual zone A second pressing recess and a third pressing recess that is between the adjacent first pressing recesses and is entirely included in either the first virtual zone or the second virtual zone. The said disposable diaper characterized by the above-mentioned.   The inner surface sheet includes a fourth pressing recess, the fourth pressing recess is outside the first virtual zone and the second virtual zone, and the center of the fourth pressing recess is from the center of the first pressing recess. The disposable diaper of Claim 1 whose dimension to is smaller than the dimension from the center of the said 1st pressing recessed part to the center of the said 2nd pressing recessed part.   The disposable diaper of Claim 1 or 2 in which the said pressing recessed part is formed in the said collar part and the said groove part.   The disposable diaper according to claims 1 to 3, wherein a distance between both side edges defining the first and second imaginary bands is the same as a diameter of the opening when the first pressing recess is circular. The absorbent body has a flat absorbent surface facing the inner sheet and a bottom surface opposite to the absorbent surface, and has a plurality of recesses from the bottom surface toward the absorbent surface,
The concave portion has a higher density of the core material than other regions where the concave portion is not provided,
The disposable diaper according to any one of claims 1 to 4, wherein the plurality of compressed recesses in the inner surface sheet and the plurality of recesses in the absorber include those that overlap in the thickness direction.   The disposable diaper according to claim 5, wherein the recess in the absorbent body is formed only in the crotch region, and the dimension in the horizontal direction is larger than the dimension in the vertical direction. The disposable diaper according to claim 6 , wherein the core material includes fluff pulp having a mass per unit area of 150 to 250 g / m ² .

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