JP6278487B2 - Disposable diapers - Google Patents

Description

  The present invention relates to a disposable diaper having excellent leakage prevention performance.

  There are many different types of leaks in disposable diapers, but one of them is pre-leakage of urine when the wearer is male (leak from the front side of the disposable diaper. .) Leakage before male does not occur when the wearer is female, but occurs when the wearer is male, even under the same conditions. The cause is shown in Patent Documents 1 and 2. In addition, the scrotum located behind the urination position is in close contact with the surface of the disposable diaper and the gap is extremely reduced, thereby inhibiting the backward movement of urine.

  In addition, according to the subsequent research by the present inventor, regardless of gender, when a single urination volume is large or multiple urinations occur even in a small volume, the urine is applied to the surface of the disposable diaper without absorbing urine in time. Contrary to the fact that the state of movement continues for a long time, the gap between the crotch surface of the disposable diaper and the body surface (hereinafter also referred to simply as the surface gap) is small, so it is difficult for urine to diffuse backwards and a gap is likely to occur. It was also found that there was a tendency to leak from the base of the legs.

JP 2013-135716 A JP 2013-135717 A JP 2011-104021 A JP 2011-125537 A

  As a means for solving such leakage due to the small surface gap, the proposals described in Patent Documents 1 and 2 by the present applicant are effective regardless of gender, but those described in Patent Document 1 There is room for improvement in terms of maintainability of the shape of the depressions forming the dents and in terms of ease of manufacture in the one described in Patent Document 2.

  Then, the main subject of this invention is providing the disposable diaper which is excellent in the maintainability of a surface gap and is easy to manufacture.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
Having a crotch portion and a rear portion extending to the rear side of the crotch portion,
In the disposable diaper provided with an absorber that absorbs urine from the crotch part to the rear side part,
The absorbent body has a surface dent forming region consisting of at least one of a penetrating part and a thin part penetrating in the thickness direction at least in the center part in the width direction of the crotch part,
The surface dent forming region includes an elongated first dent forming part extending in the front-rear direction, and a second dent forming part projecting to both sides in the width direction of the front-rear direction intermediate position or the rear side position in the first dent forming part. And
The second embossing unit is the thin portion, the first embossing portion is Ri thin thin portion der than the through portion or the second embossing unit penetrating in the thickness direction,
The second embossing unit that extends from the front-rear direction central position or this position behind the scrotum arrangement region to the rear portion,
A disposable diaper characterized by that.

(Function and effect)
In the invention described in this section, when the disposable diaper is sandwiched between both legs in the wearing state and is compressed in the width direction, the surface depression forming region is deformed so as to be pushed out to the outside of the diaper in order from the center in the width direction. A depression is formed on the surface of the diaper. At this time, the portion formed of the first dent forming portion and the second dent forming portion is wider than the portion including only the first dent forming portion in the surface dent forming region by the amount corresponding to the second dent forming portion. In addition, a wider recess is formed. In addition, since the thin hollow portion secures a certain degree of rigidity, this wide hollow portion is excellent in maintaining the shape and depth of the hollow and thus maintaining the surface gap. At the time of urination, the amount of the urine excreted in the depression area and its front side that moves on the surface without being absorbed flows to the rear side through this large surface gap and is absorbed by the rear-side absorber in the process. Is done. Therefore, it is possible to effectively prevent the diffusion inhibition due to the small surface gap, which has been a problem in the past. Although it is known to improve the diffusibility in the front-rear direction by providing the front-rear direction slit in the absorber, the present invention has an effect different in dimension compared to such a known diffusion improvement technique.

<Invention of Claim 2>
The disposable diaper according to claim 1, wherein the absorbent body has a single-layer structure.

(Function and effect)
Even if the absorber has a single layer structure, the above-described effects can be achieved by providing the surface depression formation region of the present invention.

<Invention of Claim 3 >
Having a crotch portion and a rear portion extending to the rear side of the crotch portion,
In the disposable diaper provided with an absorber that absorbs urine from the crotch part to the rear side part,
As the absorber, comprising a lower layer absorber, and an upper layer absorber provided on the lower layer absorber,
In the lower layer absorbent body, an elongated lower layer penetration part penetrating in the thickness direction is extended along the front-rear direction at least in the width direction central part of the crotch part,
The upper layer absorbent body is provided with an upper layer penetrating portion penetrating in the thickness direction within at least the front-rear direction range corresponding to the lower layer penetrating portion,
The upper layer penetrating portion is an elongated intermediate portion that is located on the lower layer penetrating portion and extends in the front-rear direction, and a projecting portion that projects on both sides in the width direction of the front-rear direction intermediate position or the rear position in the intermediate portion. Have
The overhanging portion extends from the center position in the front-rear direction of the scrotum arrangement region or from the rear position to the rear portion,
In the absorber, the region of the protruding portion of the upper layer penetrating portion is a single layer structure by the lower layer absorber, and the outer side in the width direction of the protruding portion of the upper layer penetrating portion is by the upper layer absorber and the lower layer absorber. It has a two-layer structure,
A disposable diaper characterized by that .

(Function and effect)
The invention described in this section relates to an application form when the absorber has a two-layer structure. In the absorber having a two-layer structure as described in this section, there is no absorber in the overlapping portion between the lower layer through portion and the upper layer through portion, and the protruding portion of the upper layer through portion has a single layer structure of the lower layer absorber. Thus, the outer side of the protruding portion of the upper layer penetrating portion has a two-layer structure of an upper layer absorber and a lower layer absorber. When the disposable diaper is sandwiched between both legs in the wearing state and compressed in the width direction, there is no absorber in the overlapping part between the lower layer penetration part and the middle part of the upper layer penetration part. Depending on the approach. At this time, although a force acts in a direction in which the single-layer structure portion located in the overhang portion of the upper layer penetration portion approaches each other, the single layer structure portion of the overhang portion of the upper layer penetration portion that is the boundary with the two-layer structure portion By being easy to bend to the back side along the side edge, the one-layer structure portion is bent to the back side with respect to the two-layer structure portion on the outer side in the width direction, and accordingly, the non-absorbent portion between the one-layer structure portions is directed to the back side. A wide depression is formed on the surface of the disposable diaper.
And since such a dent is not only easy to recover against compression in the width direction, but also the depth of the dent is maintained by a layered structure part bent to the back side, the maintainability of the dent, and thus the surface Excellent gap maintenance. Therefore, even in the invention described in this section, when urinating, the portion of the urine excreted in front of the depression region that moves on the surface without being absorbed flows to the rear side using this large surface gap as a flow path. It is absorbed by the rear absorber in the process. Therefore, it is possible to effectively prevent the diffusion inhibition due to the small surface gap, which has been a problem in the past. Although it is known to improve the diffusibility in the front-rear direction by providing the front-rear direction slit in the absorber, the present invention has an effect different in dimension compared to such a known diffusion improvement technique.
Furthermore, since it has been established as a manufacturing technique that the absorber has a two-layer structure and a through portion in the thickness direction is provided for each of the absorbers, the absorber can be easily manufactured only by changing its shape and positional relationship.

<Invention of Claim 4 >
The disposable diaper of Claim 3 provided with the diffusion sheet which promotes the spreading | diffusion of the urine of the front-back direction in the bottom of the said lower layer penetration part.

(Function and effect)
By providing such a diffusion sheet, the diffusion of urine in the front-rear direction through the lower layer penetration portion is promoted.

<Invention of Claim 5 >
Having a crotch portion and a rear portion extending to the rear side of the crotch portion,
In the disposable diaper provided with an absorber that absorbs urine from the crotch part to the rear side part,
As the absorber, comprising a lower layer absorber, and an upper layer absorber provided on the lower layer absorber,
In the lower layer absorbent body, at least in the width direction central portion of the crotch portion, an elongated lower layer thin portion extends along the front-rear direction,
The upper layer absorbent body is provided with an upper layer penetrating portion penetrating in the thickness direction within at least the front-rear direction range corresponding to the lower layer thin portion,
The upper layer penetrating portion is an elongated intermediate portion that is located on the lower thin portion and extends in the front-rear direction, and an overhang portion that protrudes on both sides in the width direction of the front-rear direction intermediate position or the rear position in the intermediate portion. Have
The overhanging portion extends from the center position in the front-rear direction of the scrotum arrangement region or from the rear position to the rear portion,
In the absorber, the region of the overhanging portion of the upper layer penetrating portion is a single layer structure other than the thin portion of the lower layer absorber, and the outer side in the width direction of the overhanging portion of the upper layer penetrating portion is the upper layer absorber and It is a two-layer structure with a lower layer absorber,
A disposable diaper characterized by that .

(Function and effect)
In place of the penetration part of the lower layer absorber in the invention described in claim 3, the same advantage can be obtained even if the thin part is employed as described in this claim. That is, in the two-layered absorbent body as described in this section, the overlapping part of the middle part of the lower thin part and the upper layer penetrating part is a single layer structure of the lower thin part, and the protruding part of the upper layer penetrating part is the lower layer absorbing part. It becomes a single layer structure other than the thin part of the body, and the outer side of the overhanging portion of the upper layer penetration part has a two layer structure of an upper layer absorber and a lower layer absorber. When the disposable diaper is sandwiched between both legs and is compressed in the width direction in the mounted state, a force acts in a direction in which the single-layer structure portion located at the overhanging portion of the upper layer penetrating part approaches each other, but the single-layer structure portion. Is easily bent to the back side along the side edge of the overhanging portion of the upper layer penetrating portion which is the boundary with the two-layer structure portion, so that the one-layer structure portion bends to the back side with respect to the two-layer structure portion on the outer side in the width direction. Along with this, a portion between the one-layer structure portions falls toward the back side, and a wide depression is formed on the surface of the disposable diaper.
And since such a dent is not only easy to recover against compression in the width direction, but also the depth of the dent is maintained by a layered structure part bent to the back side, the maintainability of the dent, and thus the surface Excellent gap maintenance. Therefore, even in the invention described in this section, when urinating, the portion of the urine excreted in front of the depression region that moves on the surface without being absorbed flows to the rear side using this large surface gap as a flow path. It is absorbed by the rear absorber in the process. Therefore, it is possible to effectively prevent the diffusion inhibition due to the small surface gap, which has been a problem in the past. Although it is known to improve the diffusibility in the front-rear direction by providing the front-rear direction slit in the absorber, the present invention has an effect different in dimension compared to such a known diffusion improvement technique.
Furthermore, since it has been established as a manufacturing technique that the absorber has a two-layer structure and a through portion in the thickness direction is provided for each of the absorbers, the absorber can be easily manufactured only by changing its shape and positional relationship.

<Invention of Claim 6 >
Having a crotch portion and a rear portion extending to the rear side of the crotch portion,
In the disposable diaper provided with an absorber that absorbs urine from the crotch part to the rear side part,
As the absorber, comprising an upper layer absorber and a lower layer absorber provided below the upper layer absorber,
In the upper layer absorbent body, at least in the widthwise central part of the crotch part, an elongated upper layer penetrating part or upper thin part penetrating in the thickness direction is extended along the front-rear direction,
The lower layer absorber is provided with a lower layer penetrating portion penetrating in the thickness direction within at least the longitudinal direction range corresponding to the upper layer penetrating portion or the upper layer thin portion,
The lower layer penetrating portion includes an elongated middle portion that is positioned below the upper layer penetrating portion or the upper thin portion and extends in the front-rear direction, and a tension projecting on both sides in the width direction of the middle position in the front-rear direction or the rear position. And has a protruding portion,
The overhanging portion extends from the center position in the front-rear direction of the scrotum arrangement region or from the rear position to the rear portion,
In the absorber, the region of the protruding portion of the lower layer through portion is a single layer structure other than the single layer structure of the upper layer absorber or the thin portion of the upper layer absorber, and the width direction of the protruding portion of the lower layer through portion The outside is a two-layer structure with the lower layer absorber and the upper layer absorber,
A disposable diaper characterized by that .

(Function and effect)
The shape of the upper layer through portion and the lower through portion of claim 3, and the upper penetrating portion according to claim 5 and the lower thin portion of the shape, results in similar advantages even upside down as in this section, wherein. That is, in the two-layer absorber as described in this section, the upper layer penetrating portion or the overlapping portion of the upper thin layer portion and the intermediate portion of the lower layer penetrating portion has no absorber or a single layer structure of the upper thin portion, The part of the projecting portion of the penetrating portion is a single layer structure other than the upper layer absorber or the thin layer of the upper layer absorber, and the outer portion of the projecting portion of the lower layer penetrating portion is a two-layer structure of the lower layer absorber and the upper layer absorber. Become. When the disposable diaper is sandwiched between both legs and is compressed in the width direction in the mounted state, a force acts in the direction in which the single-layer structure portion located at the overhanging portion of the lower layer penetration portion approaches each other, but the single-layer structure portion. Is easily bent to the back side along the side edge of the overhanging portion of the lower layer penetrating portion which is the boundary with the two-layer structure portion, so that the one-layer structure portion bends to the back side with respect to the two-layer structure portion on the outer side in the width direction. Along with this, a portion between the one-layer structure portions falls toward the back side, and a wide depression is formed on the surface of the disposable diaper.
And since such a dent is not only easy to recover against compression in the width direction, but also the depth of the dent is maintained by a layered structure part bent to the back side, the maintainability of the dent, and thus the surface Excellent gap maintenance. Therefore, even in the invention described in this section, when urinating, the portion of the urine excreted in front of the depression region that moves on the surface without being absorbed flows to the rear side using this large surface gap as a flow path. It is absorbed by the rear absorber in the process. Therefore, it is possible to effectively prevent the diffusion inhibition due to the small surface gap, which has been a problem in the past. Although it is known to improve the diffusibility in the front-rear direction by providing the front-rear direction slit in the absorber, the present invention has an effect different in dimension compared to such a known diffusion improvement technique.
Furthermore, since it has been established as a manufacturing technique that the absorber has a two-layer structure and a through portion in the thickness direction is provided for each of the absorbers, the absorber can be easily manufactured only by changing its shape and positional relationship.

<Invention of Claim 7 >
The disposable diaper according to any one of claims 3 to 6 , wherein a side edge of the projecting portion is shaped to be positioned at the outer side in the width direction as at least a part of the front side is directed toward the rear side.

(Function and effect)
If the side edge of the overhanging part is shaped so that at least a part of the front side is located outside in the width direction as it goes to the rear side (that is, the right side is diagonally rearward to the right and the left side is diagonally backward to the left) As the width of the single-layer structure portion located at the rear side increases toward the rear side, the single-layer structure portion gradually bends toward the rear side with respect to the two-layer structure portion on the outer side in the width direction as it moves toward the rear side. The non-absorbent part between the single layer structural parts falls toward the back side, and a substantially boat-shaped depression is formed on the surface of the disposable diaper. Such a boat-shaped dent is not only easily restored against compression in the width direction, but also the depth of the dent is maintained by a layered structure part bent on the back side, so the sustainability of the boat-shaped dent, and consequently Excellent maintainability of surface gap.

<Invention of Claim 8 >
The disposable diaper according to any one of claims 3 to 7 , wherein the projecting portion has a trapezoidal shape with a boundary with an intermediate portion as a bottom.

(Function and effect)
It is preferable that the overhanging portion has such a shape because manufacturing is easy.

  As described above, according to the present invention, there are advantages such as excellent surface gap maintenance and easy manufacture.

It is a top view which shows the inner surface side of the expansion | deployment state of a pad type disposable diaper. It is a top view which shows the lamination | stacking state of (a) lower layer absorber, (b) upper layer absorber, (c) lower layer absorber, and upper layer absorber, respectively. It is YY sectional drawing of FIG. (A) ZZ sectional drawing of FIG. 1, (b) It is XX sectional drawing. It is a perspective view. It is a perspective view of a mounting state. It is a schematic sectional drawing which shows the change of the state before mounting | wearing and after mounting | wearing. It is a photograph of a sample. It is a schematic sectional drawing which shows the change of the state before mounting | wearing and after mounting | wearing. It is a principal part top view which shows the various shapes of an upper layer penetration part. It is a top view which shows the lamination | stacking state of (a) lower layer absorber, (b) upper layer absorber, (c) lower layer absorber, and upper layer absorber, respectively. (A) It is sectional drawing equivalent to the ZZ cross section of FIG. 1, (b) It is a figure corresponded to XX cross section. It is a top view of various upper layer absorbers. It is a top view which shows the lamination | stacking state of (a) lower layer absorber, (b) upper layer absorber, (c) lower layer absorber, and upper layer absorber, respectively. (A) It is sectional drawing equivalent to the ZZ cross section of FIG. 1, (b) It is a figure corresponded to XX cross section. It is a schematic sectional drawing which shows the change of the state before mounting | wearing and after mounting | wearing. It is a top view which shows the lamination | stacking state of (a) lower layer absorber, (b) upper layer absorber, (c) lower layer absorber, and upper layer absorber, respectively. (A) It is sectional drawing equivalent to the ZZ cross section of FIG. 1, (b) It is a figure corresponded to XX cross section. It is a schematic sectional drawing which shows the change of the state before mounting | wearing and after mounting | wearing. It is a top view which shows the lamination | stacking state of (a) lower layer absorber, (b) upper layer absorber, (c) lower layer absorber, and upper layer absorber, respectively. (A) It is sectional drawing equivalent to the ZZ cross section of FIG. 1, (b) It is a figure corresponded to XX cross section. It is a schematic sectional drawing which shows the change of the state before mounting | wearing and after mounting | wearing. It is a top view which shows the inner surface side of the expansion | deployment state of a pad type disposable diaper. It is a top view of an absorber. (A) ZZ sectional drawing of FIG. 23, (b) XX sectional drawing. It is a schematic sectional drawing which shows the change of the state before mounting | wearing and after mounting | wearing. (A) Cross-sectional view corresponding to the ZZ cross section of FIG. 23, (b) A view corresponding to the XX cross section. It is a schematic sectional drawing which shows the change of the state before mounting | wearing and after mounting | wearing. It is a top view which shows the various modifications of a lower layer absorber.

Hereinafter, an embodiment of the present invention will be described in detail with reference to an example of a pad-type disposable diaper shown in the accompanying drawings.
1-6 has shown the pad type disposable diaper 200. FIG. This pad-type disposable diaper 200 has a crotch portion C2, and a front portion F2 and a rear portion B2 extending on both front and rear sides thereof. The dimensions of each part can be determined as appropriate. For example, the total length L (length in the front-rear direction) of the diaper can be about 350 to 700 mm, and the total width W1 of the diaper can be about 130 to 400 mm. The length can be about 10 to 150 mm, the length of the front portion F2 in the front-rear direction can be about 50 to 350 mm, and the length of the rear portion B2 can be about 50 to 350 mm. “Crotch part” means a part corresponding to the crotch of the body at the time of use. Depending on the product, the range from the center in the front-rear direction of the article or its vicinity to a predetermined part on the front side as shown in the figure, Or a predetermined range at the center in the front-rear direction. As shown in the figure, when there is a narrow constricted portion in the middle in the front-rear direction of the article or in the middle in the front-rear direction of the absorbent body, the “groin portion” is a predetermined front-rear direction having the minimum width portion of the constricted portion in the front-rear direction Means range. Further, “front part (abdominal part)” means a part on the front side of the crotch part, and “rear part (back side part)” means a part on the rear side of the crotch part.

  The pad-type disposable diaper 200 has a basic structure in which an absorber 23 is interposed between a liquid-impermeable sheet 21 and a liquid-permeable top sheet 22. In addition, the dot pattern part in a figure has shown the junction part which joins each structural member, and is formed by solid, beads, curtains, summits, spiral application, etc., such as a hot-melt-adhesive.

(Liquid impervious sheet / exterior sheet)
A liquid-impermeable sheet 21 is provided on the back side of the absorber 23 so as to protrude slightly from the peripheral edge of the absorber 23. As the liquid-impermeable sheet 21, a sheet having moisture permeability can be used in addition to a polyethylene film or the like without impairing the water barrier from the viewpoint of preventing stuffiness. This water-impervious / breathable sheet is a microporous sheet obtained by, for example, melt-kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching in a uniaxial or biaxial direction. Can be used.

  Moreover, the outer surface of the liquid-impermeable sheet 21 can be covered with an exterior sheet 26 made of a non-woven fabric. In this case, the width of the liquid-impermeable sheet 21 can be made the same as the width of the absorber 23. . Various nonwoven fabrics can be used as the exterior sheet 26. As the material fiber constituting the non-woven fabric, synthetic fibers such as polyethylene or polypropylene such as olefin, polyester and amide, recycled fibers such as rayon and cupra, and natural fibers such as cotton can be used.

(Liquid permeable top sheet)
The front side of the absorber 23 is covered with a liquid-permeable top sheet 22. Although the absorber 23 partially protrudes from the side edge of the top sheet 22 in the illustrated form, the width of the top sheet 22 can be widened so that the side edge of the absorber 23 does not protrude. As the top sheet 22, a perforated or non-porous nonwoven fabric or a perforated plastic sheet is used. As the material fiber constituting the non-woven fabric, synthetic fibers such as polyethylene or polypropylene such as olefin, polyester and amide, recycled fibers such as rayon and cupra, and natural fibers such as cotton can be used.

  It is desirable to interpose the intermediate sheet 25 between the top sheet 22 and the absorber 23. The intermediate sheet 25 is provided to prevent the urine absorbed by the absorbent body 23 from returning, and it is desirable to use a material having low water retention and high liquid permeability, such as a nonwoven fabric or a mesh film. . When the front end of the top sheet 22 is 0% and the rear end of the top sheet 22 is 100%, the front end of the intermediate sheet 25 is preferably located in the range of 0 to 11%. It is preferably located in the range of 92 to 100%. The width 25w of the intermediate sheet 25 is preferably about 50 to 90% of the width W2 of the absorber 23.

(End flap / side flap)
At both ends in the front-rear direction of the pad-type disposable diaper 200, the exterior sheet 26 and the liquid-permeable top sheet 22 are attached to the front and rear ends of the absorbent body 23 so as to extend to the front and rear sides, respectively. Part EF is formed. On both sides of the pad-type disposable diaper 200, the exterior sheet 26 is extended outward from the side edge of the absorbent body 23, and the inner surface of the part from the extended part to the side part of the top sheet 22 is side solid. A portion 34 on the outer side in the width direction of the gather sheet 31 is pasted over the entire front-rear direction to constitute a side flap portion SF where the absorber 23 does not exist. These bonded portions can be formed by hot melt adhesive, heat sealing, or ultrasonic sealing. When the exterior sheet 26 is not provided, the liquid-impermeable sheet 21 can be extended to the side flap part SF instead of the exterior sheet 26 to form the outer surface side of the side flap part SF.

(Side three-dimensional gather)
Side solid gathers 30 extending in the front-rear direction are provided on both sides of the surface. The side solid gathers 30 are formed by the side solid gather sheets 31 described above. A portion 32 on the center side in the width direction of the side three-dimensional gather sheet 31 extends to the top sheet 22, and a side three-dimensional gather elastic elastic member 33 extends in the front-rear direction at the end on the center side in the width direction. It is fixed by a hot melt adhesive or the like in a stretched state along.

  As a material of the side three-dimensional gather sheet 31, a plastic sheet or a melt blown nonwoven fabric can be used, but in terms of touch to the skin, a nonwoven fabric that is water-repellent treated with silicon or the like is preferably used. . As this side part three-dimensional gather elastic elastic member 33, a styrene rubber, an olefin rubber, a urethane rubber, an ester rubber, polyurethane, polyethylene, polystyrene, styrene formed in an elongated shape such as a thread shape, a string shape, a belt shape, or the like. Commonly used materials such as butadiene, silicon, and polyester can be used. Moreover, it is preferable that the elongation rate at the time of fixation of each planar gather elastic elastic member 7 is about 170-200%. The term “elongation rate” is a value when the natural length is 100%.

  In addition, the side three-dimensional gather sheet 31 has a width direction outer portion 34 bonded to the inner surface of the diaper (in the illustrated form, the top sheet 22 surface and the outer sheet 26 inner surface) to form a fixed portion 34 and a width. A portion 32 on the center side in the direction is a protruding portion 32 protruding from the fixed portion. Of the projecting portions 32, both ends in the front-rear direction are stuck to the diaper surface (the top sheet 22 surface in the illustrated embodiment) in a lying state to form a non-standing portion 35, and the portion between the non-standing portions 35 is The standing portion 36 is not fixed to the diaper surface (the top sheet 22 surface in the illustrated embodiment). The standing portion 36 stands up from the surface of the diaper (in the illustrated form, the surface of the top sheet 22) by the contraction force of the side three-dimensional gather elastic elastic member 33 acting as shown by a two-dot chain line in FIG. The raised base end 37 is a portion that contacts the groin portion and the like, and the standing base end 37 is located at the boundary between the fixed portion 34 and the protruding portion 32 in the side three-dimensional gather sheet 31.

(Plane gathering)
An elongated flat surface between the side three-dimensional gather sheet 31 and the liquid-impermeable sheet 21 (may be between the liquid-impermeable sheet 21 and the exterior sheet 26) is provided in the middle part in the front-rear direction of the side flap part SF. The gather elastic elastic member 27 is fixed in a stretched state along the front-rear direction by a hot melt adhesive or the like, and a so-called flat gather is formed in the side flap portion SF by contraction of the flat gather elastic elastic member 27. By this flat gather, the side part of the diaper is elastically stretched to fit around the leg.

  Although the number of the planar gather elastic elastic members 27 on the left and right sides can be determined as appropriate, about 1 to 10, more preferably about 2 to 5, is appropriate. About 2 to 15 mm, particularly about 6 to 10 mm is preferable. Further, as each planar gather elastic elastic member 27, a styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicon formed in a thread shape, a string shape, a belt shape, or the like. Usually used materials such as polyester can be used, and the thickness is preferably about 500 to 1500 dtex, and in the case of natural rubber, about 0.1 to 3 mm, particularly about 0.5 to 3 mm. Moreover, it is preferable that the elongation rate at the time of fixing each planar gather elastic expansion-contraction member 27 is about 150 to 250%.

(Absorber)
The absorber 23 has a two-layer structure including a lower layer absorber 23B and an upper layer absorber 23A provided on the lower layer absorber 23B.

As the lower layer absorbent body 23B and the upper layer absorbent body 23A, pulp fiber piles, aggregates of filaments such as cellulose acetate, or non-woven fabrics are basically mixed, and if necessary, mixed with a superabsorbent polymer such as particles and fixed. And the like can be used. The fiber basis weight and the basis weight of the superabsorbent polymer in the lower layer absorbent body 23B and the upper layer absorbent body 23A can be determined as appropriate. The fiber basis weight is preferably about 140 to 230 g / m ^2. Is preferably about 60 to 90 g / m ² . The lower layer absorbent body 23B and the upper layer absorbent body 23A are integrally or individually packaged sheets 24 such as crepe paper (see FIG. 1, FIG. 7, FIG. 9). ).

  Further, the outer shape of the absorber 23 may be an appropriate shape such as a band shape, a rectangular shape, or a trapezoidal shape in which the front portion is relatively wider than the rear portion, but before and after including the crotch portion C2. The predetermined portion in the middle of the direction is preferably formed as a narrowed portion 23n having a narrow width. The minimum width W3 of the constricted portion 23n is preferably about 50 to 65% of the width (total width of the absorber 23) W2 of the non-constricted portion located before and after the constricted portion 23n. When the front end of the diaper is 0% and the rear end of the diaper is 100%, the front end of the constricted portion 23n is preferably located in the range of 10 to 25%, and the rear end of the constricted portion 23n is 40 to 65%. It is preferable that the portion of the constricted portion 23n having the minimum width W3 (minimum width portion) is preferably in the range of 25 to 30%.

  When the absorber has a two-layer structure, it is preferable to make the lower layer absorber larger. Therefore, as shown in the figure, the outer shape of the absorber is formed by the lower layer absorber, and the shape is constricted as described above. The outer shape of the upper absorbent body is preferably a rectangular shape narrower than the width of the constricted portion 23n.

  The absorber 23 extends from the front side of the crotch part C2 through the crotch part C2 to the rear side of the crotch part C2, but may be provided from the crotch part C2 to the rear side of the crotch part C2. In particular, considering male use, it is desirable that the scrotum arrangement region C1 is provided from the front side to the rear side. Here, the “scrotal placement region C1” means a front-rear direction region in which the wearer's scrotum is placed, and therefore the front side becomes “a front side region of the scrotum placement region C1”. The rear side is the “rear area of the scrotum arrangement area C1”. In a normal case, the length of the scrotum arrangement region C1 in the front-rear direction is about 80 to 100 mm.

(First form of surface depression forming region)
Characteristically, as shown in FIGS. 1 to 4, an elongated lower layer penetrating portion 60 penetrating in the thickness direction (that is, having no absorber) at least in the widthwise central portion of the crotch portion C2 in the lower layer absorber 23B. Is extended along the front-rear direction, and the upper-layer absorber 23A has an upper-layer through portion 50 penetrating in the thickness direction (that is, having no absorber) within at least the front-rear direction range corresponding to the lower layer through-portion 60. Is provided. The upper layer penetrating portion 50 includes an elongated intermediate portion 51 that is located on the lower layer penetrating portion 60 and extends in the front-rear direction, and an overhang portion 52 that projects to both sides in the width direction of the rear position of the intermediate portion 51. The side edge of the overhang portion 52 has a shape that is positioned on the outer side in the width direction as at least a part of the front side goes to the rear side.

  In the absorber 23 having such a two-layer structure, there is no absorber 23 in the overlapping portion (first dent forming portion) of the intermediate portion 51 of the lower layer penetrating portion 60 and the upper layer penetrating portion 50, and the overhanging portion of the upper layer penetrating portion 50 is extended. The portion 52 (second depression forming portion) has a single layer structure of the lower layer absorber 23B, and the outer side of the overhanging portion 52 of the upper layer through portion 50 has a two layer structure of the upper layer absorber 23A and the lower layer absorber 23B. As shown in FIGS. 6 to 9, when the disposable diaper is sandwiched between both legs in the mounted state and compressed in the width direction (see the white arrows in FIGS. 7 and 9), the lower layer through portion 60 and the upper layer through portion Since there is no absorber 23 in the overlapping part of the intermediate part 51 of 50, the both side edges of the lower layer penetration part 60 and the upper layer penetration part 50 approach according to the amount of compression, and a thin groove 71 is formed on the surface of the disposable diaper. . At this time, although a force acts on the single-layer structure portion 23w located in the overhanging portion 52 of the upper layer penetrating portion 50 in a direction approaching each other, the side edge of the overhanging portion 52 of the upper layer penetrating portion 50 is at least a part of the front side. Is formed in a shape located on the outer side in the width direction toward the rear side (that is, the right side is obliquely rearward and the left side is obliquely rearward), so that the one-layer structure portion 23w is a boundary with the two-layer structure portion. Since it is easy to bend to the back side along the side edge of the overhanging portion 52 of the upper layer penetration portion 50, the one-layer structure portion 23w bends to the back side with respect to the two-layer structure portion on the outer side in the width direction. The non-absorbent part between the parts 23w falls toward the back side, and as shown in FIGS. 6 and 8, a substantially boat-shaped depression 72 is formed on the surface of the disposable diaper. Such deformation is unlikely to occur when the protruding portion 52 of the upper layer penetrating portion 50 is rectangular (that is, the side edge of the protruding portion 52 is U-shaped). Such a boat-shaped depression is not only easily restored to compression in the width direction, but also the depth of the depression is maintained by the one-layer structure portion 23w bent to the back side, so that the surface gap is maintained. Excellent in properties. During urination, the portion of the urine excreted in front of the depression area that moves on the surface without being absorbed flows to the rear side through this large surface gap, and is absorbed by the rear-side absorber 23 in the process. Is done. Therefore, it is possible to effectively prevent the diffusion inhibition due to the small surface gap, which has been a problem in the past.

  As long as the shape of the lower layer penetrating portion 60 is long and narrow, the width of the lower layer penetrating portion 60 is not limited to a rectangular shape that is constant in the front-rear direction, as shown in the figure, and the width changes in the front-rear direction (e.g. It can be changed as appropriate. Although the dimension of the lower layer penetration part 60 can be determined suitably, when the standard adult using this kind of disposable diaper is considered, it is preferable that the front-back direction length 62 shall be about 180-210 mm. Moreover, although the width 61 of the lower layer penetration part 60 can be determined suitably, since the shape maintenance property of the clearance gap mentioned later is better when it is not so wide, it is preferably about 20 to 40 mm in a normal case. As shown in FIGS. 11 and 12, a plurality of lower layer through portions 60 may be provided at intervals in the width direction. Further, as shown in FIG. 29A, the front end of the lower layer penetration part 60 is extended forward to, for example, the front part F2, and branch-like penetration parts 66 extending obliquely left front and right diagonally forward from the extension part 65 are provided. In addition, the rear end of the lower layer penetration 60 is extended rearward to, for example, the rear portion B2, and a branch-like penetration 66 extending diagonally leftward and rearward from the extended portion 65 is provided, as shown in FIG. As shown, a radial extension 67 extending radially from the front end of the lower layer penetration 60 to the front portion F2, for example, is provided, and radially extending rearward from the rear end of the lower layer penetration 60 to the rear portion B2, for example. An extension part 67 can also be provided. In the example shown in FIGS. 29 (a) and 29 (b), the extension portion 65 and the branch-like through portion 66 or the radial extension portion 67 are provided on both the front and rear sides. However, as shown in FIGS. Only one of them can be used, or the shape can be changed before and after (for example, either one of the front or back can be an extension portion 65 and a branch-like penetration portion 66, and the other can be a radial extension portion 67).

  Moreover, the lower layer penetration part 60 is provided in the middle in the front-rear direction of the lower layer absorber 23B, that is, the lower layer penetration part 60 is arranged so that it does not penetrate through the lower layer absorber 23B. It is desirable to ensure.

  On the other hand, the dimension of the upper layer penetrating portion 50 can be determined as appropriate, and the length in the front-rear direction (the same applies to the intermediate portion 51) is the same as that of the lower layer penetrating portion 60 as shown in the figure. It can be shortened or lengthened.

  The width 55 of the intermediate portion 51 of the upper layer penetrating portion 50 is preferably equal to or larger than the width 61 of the lower layer penetrating portion 60. In consideration of securing the protruding portion 52, the width 61 of the lower layer penetrating portion 60 is 1.2. It is desirable to be about 1.5 times. The width 56 (the sum of the width of the intermediate portion 51 and the width of the overhanging portion 52) of the portion having the overhanging portion 52 of the upper layer penetrating portion 50 is the size of the depression (mainly the height of the wall) and the shape maintenance of the depression. It is desirable to set the width of the intermediate portion 51 in consideration of 1.5 to 2 times, more specifically, about 36 to 120 mm.

  The position in the front-rear direction of the overhanging portion 52 of the upper layer penetrating portion 50 can be determined as appropriate, and the rear position of the upper layer penetrating portion 50 may be expanded to the side as shown in the example, but the intermediate position in the front-rear direction is set to the side. It is also possible to extend it in the direction. In addition, the intermediate portion 51 is extended to the front side of the upper layer penetrating portion 50 in the illustrated form, and overhang portions are added to both sides in the width direction in a shape symmetrical with the overhang portion 52 at the rear side position, A pair of boat-shaped depressions may be opposed to each other with a narrow groove 71 in the longitudinal direction (a substantially hourglass-shaped depression is formed).

  Of the intermediate portion 51 of the upper layer penetrating part 50, the shape of the portion without the protruding portion 52 is a rectangular shape whose width is constant in the front-rear direction as shown in the figure, and the width changes in the front-rear direction (for example, backward) The shape can be appropriately changed, such as a shape whose width increases as the height increases. The shape of the protruding portion 52 of the upper layer penetrating portion 50 may be a bent line shape as shown in the figure, or a curved shape such as an arc shape. In the illustrated embodiment, the boundary with the intermediate portion 51 is the lower bottom and the rear edge is lower so that at least a part of the front side of the side edge of the overhanging portion 52 has a shape that is located on the outer side in the width direction toward the rear side. A trapezoidal shape perpendicular to the bottom (the shape including the overhanging portion 52 and the intermediate portion 51 therebetween is a pentagonal shape) is trapezoidal as shown in FIG. The shape including the intermediate portion 51 may be a hexagonal shape. Moreover, the shape of the side edge of the overhanging portion 52 is, for example, as shown in FIG. 13A, a shape in which a part of the front side is positioned on the outer side in the width stepwise as it goes to the rear side. As shown in FIG. 13B, a part of the front side may be positioned on the outer side in the width direction toward the front side, or may be rectangular as shown in FIG.

  Although the front-rear direction position of the upper layer penetrating portion 50 can be determined as appropriate, it is preferable that the front end (front end of the intermediate portion 51) is located at the front side or the front side of the lower layer penetrating portion 60. It can also be located on the side. Further, it is preferable that the rear end of the upper layer penetrating portion 50 is the same as the rear end of the lower layer penetrating portion 60 as shown in the drawing, or it is preferably located on the rear side, but it may be located on the front side. preferable. As an example of the latter, as shown in FIG. 10 (b), the lower layer penetrating portion 60 extends rearward from the rear end of the upper layer penetrating portion 50 and rearward of the crotch portion C2. In this case, when urine passes through the lower layer penetration part 60 and enters the lower side of the upper layer absorbent body 23A, the return to the skin side is blocked by the upper layer absorbent body 23A. Will be.

  Further, as shown in the figure, the intermediate portion 51 of the upper layer penetrating portion 50 extends to the front end of the upper layer absorber 23A and is opened at the front end of the upper layer absorber 23A, and the front end of the upper layer absorber 23A is the lower layer absorber. When the crotch portion C2 is compressed in the width direction when the front end of the penetrating portion 60 is located on the same side or on the rear side, the front side of the upper layer absorbent body 23A and the front side of the upper layer penetrating portion 50 are easily compressed. As a result, the aforementioned boat-shaped depression is easily formed, which is preferable.

  In the illustrated example, since there is no absorber in the portion overlapping the lower layer penetration, the urine diffusibility is good, but the passage formed by the lower layer penetration is easily deformed and may be crushed. Therefore, as shown in FIGS. 14 to 16, if a diffusion sheet 63 that promotes diffusion of urine in the front-rear direction is provided at the bottom of the lower layer penetration part, the passage by the lower layer penetration part is easily maintained, The diffusion of urine in the front-rear direction is promoted.

The material of the diffusion sheet 63 is not particularly limited as long as the diffusion sheet 63 can promote urine diffusion in the front-rear direction, but a non-woven fabric or a plastic sheet is used, and a synthetic fiber tow (fiber bundle) such as cellulose acetate is required. Accordingly, a filament aggregate obtained by opening can also be used.
As the material fiber constituting the non-woven fabric, synthetic fibers such as polyethylene or polypropylene such as olefin, polyester and amide, recycled fibers such as rayon and cupra, and natural fibers such as cotton can be used. Woven cloth is preferably about 10 to 40 g / m ^2. In the case of using a plastic sheet, in addition to a sheet provided with a groove-like structure along the front-rear direction on the surface, a sheet having a hollow structure formed by bonding a plurality of plastic sheets can be used. Moreover, you may use the thing formed by mixing and adhering superabsorbent polymers, such as a particle form, as needed based on a nonwoven fabric.
In the case of using a filament aggregate, the fiber basis weight can be about 30 to 120 g / m ² . The fineness is 1 to 16 dtex, preferably 1 to 10 dtex, more preferably 1 to 5 dtex. The filament may be a non-crimped fiber, but is preferably a crimped fiber. The crimped degree of the crimped fiber can be, for example, 5 to 75, preferably 10 to 50, and more preferably about 15 to 50 per inch. Further, a crimped fiber that is uniformly crimped is often used.

  The diffusion sheet 63 is preferably provided over the entire lower layer through portion 60, but may be provided only in a part such as a part in the front-rear direction or a part in the width direction. As long as the diffusion sheet 63 is provided at the bottom of the lower layer penetrating portion, the diffusion sheet 63 may be provided between the top sheet 22 and the liquid-impermeable sheet 21 as shown in the figure, or may be attached to the surface of the top sheet 22. When the diffusion sheet 63 is provided, when the top sheet 22 is subjected to heat and pressure processing such as heat embossing and the top sheet and the diffusion sheet 63 are directly or indirectly fused, the bottom rigidity of the lower layer penetration portion is high. It is preferable because the passage by the lower layer through portion is less likely to be crushed.

(Crotch three-dimensional gather)
Further, in the illustrated embodiment, the protruding portion 42 protruding from the side of the upper layer penetrating portion 50 extends in the front-rear direction, and the portions located on the front side and the rear side of the protruding portion 42 are fixed in a lying state. A crotch portion three-dimensional structure in which a non-standing portion 45 is formed, a portion between the non-standing portions 45 is an unfixed standing portion 46, and the gather elastic elastic member 43 is fixed to the standing portion 46 in a state of extending in the front-rear direction. The gathers 40 are provided on both sides in the width direction of the surface. The standing portion 46 is a portion that rises from the surface of the diaper as shown by a two-dot chain line in FIG. 4 when the contraction force of the gather elastic elastic member 43 acts.

  The crotch three-dimensional gather 40 may not be provided, but the amount of absorption of the crotch C2 is inevitably reduced by the upper layer penetrating part 50 and the lower layer penetrating part 60, and the urine easily moves. It is preferable to provide it separately.

  The crotch portion three-dimensional gather 40 may be formed by attaching a dedicated sheet to the diaper surface, but as shown in the figure, the side portion of the top sheet 22 from the upper layer penetrating portion 50 is folded to project the protruding portion 42. Is preferably formed.

  When the crotch part three-dimensional gather 40 is provided, the overhanging part 52 of the upper layer penetration part 50 is located between the non-standing parts 45 of the crotch part three-dimensional gather 40 in the front-rear direction (in other words, the tension of the upper layer penetration part 50). When the position in the width direction of the protruding portion 52 and the position in the width direction of the non-standing portion 45 of the crotch portion three-dimensional gather 40 overlap), the contraction force of the gather elastic elastic member 43 of the crotch portion three-dimensional gather 40 is more effective for the structural portion 23w. This is preferable because the formation of the boat-shaped depression described above is promoted and the shape maintainability of the depression is improved. However, the non-standing part 45 of the crotch part three-dimensional gather 40 may be located in the width direction center side or the outer side from the overhang | projection part 52 of the upper layer penetration part 50. FIG.

  Further, the width direction position of the base end of the protruding portion 42 in the crotch portion three-dimensional gather 40 is desirably spaced laterally from the overhanging portion 52 as illustrated, but the side edge of the overhanging portion 52 Or can be positioned within the overhanging portion 52. In particular, the position in the width direction of the base end of the projecting portion 42 in the crotch portion three-dimensional gather 40 is the two-layer structure portion of the upper layer absorbent body 23A and the lower layer absorbent body 23B outside the projecting portion 52 of the upper layer through portion 50 in the unfolded state. The top is most preferred. Moreover, it is most preferable that the position in the width direction of the tip of the protruding portion 42 in the crotch portion three-dimensional gather 40 is a position that passes over the one-layer structure portion 23w in the unfolded state. With these arrangements, the one-layer structure portion 23w can easily be bent to the back side along the side edge of the overhang portion 52 of the upper layer through portion 50 that is the boundary with the two-layer structure portion. And better maintenance.

  The material of the gather elastic elastic member 43 in the crotch portion three-dimensional gather 40 and the elongation ratio at the time of fixation can be appropriately selected from the same materials and ranges as those of the side three-dimensional gather 30. The crotch three-dimensional gather 40 is formed by attaching a dedicated sheet to the diaper surface, and even if a top sheet is provided separately from the diaper surface, the top sheet 22 in the side of the upper layer penetrating part 50 as shown in FIG. Even if the crotch three-dimensional gathers 40 are formed by folding the part, at least the region between the crotch three-dimensional gathers 40, particularly at least the surface depression formation region, promotes diffusion to the back side by making the top sheet water-repellent. It is preferable because it can be used.

  The dimensions of each part of the crotch three-dimensional gather 40 can be determined as appropriate. However, in consideration of a standard adult using this type of disposable diaper, the interval between the non-standing parts 45 is preferably about 150 to 180 mm. The width direction interval of the base end of the protruding portion 42 is preferably about 60 to 80 mm. Further, it is preferable that the standing portion 36 of the side three-dimensional gather 30 extends forward and rearward from the standing portion 46 of the crotch three-dimensional gather 40.

  In the illustrated example, the crotch three-dimensional gather 40 extends over the entire length L of the disposable diaper in consideration of a general manufacturing form in which materials are assembled while being transported along the front-rear direction of the disposable diaper at the time of manufacture (however, the non-standing part) 45 is longer than the side three-dimensional gather 30), and the length from the front side vicinity to the rear side vicinity may be set on the basis of the front-rear direction range having the protruding portion 52 of the upper layer penetrating part 50. .

(Second form of surface depression formation region)
Instead of the lower layer penetrating portion 60 of the lower layer absorbent body 23B in the first embodiment, as shown in FIGS. 17 to 19, the lower layer thin portion 64 that is thinner than the surroundings (not penetrating in the thickness direction) is formed. The same advantages as those of the first embodiment are brought about. That is, in the second embodiment, the overlapping portion (first dent forming portion) of the lower layer thin portion 64 and the intermediate portion 51 of the upper layer penetrating portion 50 is a single layer structure of the lower layer thin portion 64, and the protruding portion of the upper layer penetrating portion 50 is formed. The portion 52 (second depression forming portion) has a single layer structure composed of a portion 23w other than the thin portion of the lower layer absorber 23B, and the outside of the overhanging portion 52 of the upper layer through portion 50 is the upper layer absorber 23A and the lower layer absorber 23B. It becomes a two-layer structure. When the disposable diaper is sandwiched between both legs in the mounted state and compressed in the width direction, a force acts in a direction approaching the single-layer structure portion 23w located in the overhanging portion 52 of the upper layer through portion 50, The single-layer structure portion 23w is easily bent to the back side along the side edge of the overhanging portion 52 of the upper layer penetrating portion 50, which is the boundary with the two-layer structure portion, so that the single-layer structure portion 23w has a double-layer structure on the outer side in the width direction. It bends to the back side with respect to the portion, and accordingly, the portion between the single-layer structure portions 23w falls toward the back side, and a wide recess is formed on the surface of the disposable diaper. And such a dent is not only easy to recover against compression in the width direction, but also the depth of the dent is maintained because the one-layer structure part 23w bent to the back side becomes a wall. Excellent maintainability of surface gap. Therefore, also in the second embodiment, during urination, the portion of the urine excreted in the front side of the depression region that moves on the surface without being absorbed flows to the rear side using this large surface gap as a flow path. In the process, it is absorbed by the absorber 23 on the rear side. Therefore, it is possible to effectively prevent the diffusion inhibition due to the small surface gap, which has been a problem in the past.

  Although the thickness of the lower layer thin part 64 is not specifically limited, It can be set to about 10 to 50% of the thickness of parts other than a thin part, and can be about 1 to 5 mm in normal cases. The lower thin portion is not limited by the forming method, and for example, it is formed by lowering the basis weight from the surroundings, or formed by a process of compressing in the thickness direction (can be heated as necessary). be able to.

  Others are the same as those of the first embodiment including the modified example, and it is only necessary to replace the lower layer through portion 60 in the description of the first embodiment with the lower layer thin portion 64, and therefore further description is omitted.

(Third form of surface depression formation region)
The same advantages can be obtained even if the shapes of the upper layer penetration part and the lower layer penetration part of the first embodiment are turned upside down as shown in FIGS. In FIG. 21 to FIG. 22, reference numeral 80 is the upper layer penetration part, reference numeral 81 is the width of the upper layer penetration part 80, reference numeral 82 is the longitudinal length of the upper layer penetration part 80, reference numeral 90 is the lower layer penetration part, and reference numeral 91 is the lower layer penetration part. Reference numeral 90 denotes an intermediate portion, reference numeral 92 denotes an overhang portion of the lower layer through-hole 90, reference numeral 95 denotes the width of the intermediate portion 91, and reference numeral 96 denotes the width of the portion having the overhang portion 92 of the lower layer through-hole 90. In the third embodiment, the overlapping portion (first depression forming portion) between the upper layer penetrating portion 80 and the intermediate portion 91 of the lower layer penetrating portion 90 has a structure without the absorber 23, and the overhang portion 92 of the lower layer penetrating portion 90 The part (second depression forming portion) has a single layer structure of the upper layer absorber 23A, and the outside of the overhang portion 92 of the lower layer through portion 90 has a two layer structure of the lower layer absorber 23B and the upper layer absorber 23A. When the disposable diaper is sandwiched between both legs in the mounted state and compressed in the width direction, a force acts in the direction of approaching the single-layer structure portion 23w located in the overhang portion 92 of the lower layer penetration portion 90, The single-layer structure portion 23w is easily bent to the back side along the side edge of the overhang portion 92 of the lower layer through-hole 90, which is the boundary with the two-layer structure portion, so that the single-layer structure portion 23w has a double-layer structure on the outer side in the width direction. It bends to the back side with respect to the portion, and accordingly, the portion between the single-layer structure portions 23w falls toward the back side, and a wide recess is formed on the surface of the disposable diaper. And such a dent is not only easy to recover against compression in the width direction, but also the depth of the dent is maintained because the one-layer structure part 23w bent to the back side becomes a wall. Excellent maintainability of surface gap. Therefore, even in the invention described in this section, when urinating, the portion of the urine excreted in front of the depression region that moves on the surface without being absorbed flows to the rear side using this large surface gap as a flow path. In the process, it is absorbed by the rear absorber 23. Therefore, it is possible to effectively prevent the diffusion inhibition due to the small surface gap, which has been a problem in the past.
Although not shown, similarly, the shapes of the upper layer through portion 50 and the lower layer thin portion 64 of the second form can be reversed upside down.

  Others are the same as those of the first and second embodiments including the modified example, and only the upper and lower portions in the description of the first and second embodiments need to be read. Therefore, further explanation is omitted.

(Fourth form of surface depression formation region)
In the first to third embodiments, the surface depression formation region is formed by using the absorber as a two-layer structure. However, as shown in FIGS. Disposable diapers having similar characteristics can be obtained by providing the region.

  More specifically, in the form shown in FIG. 23 to FIG. 26, an elongated first dent forming portion 231 extending in the front-rear direction at the center portion in the width direction of the crotch portion C <b> 2 in the single-layer absorbent body 23, and this Surface dent forming regions 231 and 232 having second dent forming portions 232 projecting to both sides in the width direction of the first dent forming portion 231 in the front-rear direction intermediate position or the rear side position are provided, and the second dent forming portion 232 is The thin part is thinner than the periphery (not penetrating in the thickness direction), and the first dent forming part 231 is a penetrating part penetrating in the thickness direction.

  In a disposable diaper provided with such an absorbent body 23, when the disposable diaper is sandwiched between both legs and is compressed in the width direction in the mounted state, the surface dent forming regions 231 and 232 are sequentially arranged from the center in the width direction. While deforming so as to be pushed outward, depressions 71 and 72 are formed on the surface of the diaper. At this time, the portion including the first dent forming portion 231 and the second dent forming portion 232 in the portion including the first dent forming portion 231 in the surface dent forming regions 231 and 232 is the second dent forming portion 232. Since the width is wider by this, a wider recess 72 is formed. In addition, since the wide hollow portion 72 is secured to a certain degree by the thin portion, the shape and depth of the hollow 72 can be maintained, and the surface gap can be maintained. At the time of urination, the portion of the dent 72 region and the urine excreted on the front side thereof that moves on the surface without being absorbed flows to the rear side through this large surface gap, and in the process, the rear-side absorber 23 Is absorbed by. Therefore, it is possible to effectively prevent the diffusion inhibition due to the small surface gap, which has been a problem in the past.

  As shown in FIG. 27 and FIG. 28, the first dent forming portion 231 can be a thin portion having a thickness smaller than that of the second dent forming portion 232 without using the penetrating portion. When the first dent forming part 231 is a penetration part, the urine diffusibility is good, but the passage formed by the first dent forming part 231 is easily deformed and may be crushed. Therefore, by setting the first dent forming part 231 to be a thin part, the passage by the first dent forming part 231 is easily maintained, and diffusion of urine in the front-rear direction through the first dent forming part 231 is promoted. Become.

  Although the thickness of the 2nd hollow formation part 232 is not specifically limited, It can be set as about 10-50% of the thickness of parts other than the surface depression formation area | region 231,232, and can be about 1-5 mm in normal case. . Moreover, when making the 1st hollow formation part 231 into a thin part, the thickness is not specifically limited, However, It can be set as about 10-50% of the thickness of the 2nd hollow formation part 232, Usually, about 1-5 mm It can be. These thin portions are not limited by the forming method, and for example, formed by lowering the basis weight from the surroundings, or formed by a process that compresses in the thickness direction (can be heated if necessary). can do.

  The 1st hollow formation part 231 can be made into the same dimension shape as the lower layer penetration part 60 in a 1st form. That is, as long as the shape of the first dent forming portion 231 is elongated, the width changes in the front-rear direction as shown in the figure, and the width changes in the front-rear direction (for example, the width increases toward the rear). The shape can be appropriately changed. Although the dimension of the 1st hollow formation part 231 can be determined suitably, when the standard adult using this kind of disposable diaper is considered, it is preferable that the front-back direction length 231L shall be about 180-210 mm. Moreover, although the width | variety 231W of the 1st hollow formation part 231 can be determined suitably, since the shape maintenance property of the hollow 72 is better when it is not so wide, in the normal case, it is preferably about 20 to 40 mm. Similarly to the lower layer penetrating portion 60 shown in FIGS. 11 and 12, a plurality of first dent forming portions 231 can be provided at intervals in the width direction.

  Moreover, the 1st hollow formation part 231 is provided in the front-back direction intermediate | middle of the absorber 23, ie, the 1st hollow formation part 231 is arrange | positioned so that it may not penetrate through the front and back of the absorber 23. It is desirable to ensure the rigidity.

  The 2nd hollow formation part 232 can be made into the same dimension shape as the part which has the overhang | projection part 52 of the upper layer penetration part 50 in a 1st form. That is, the width 232W of the second dent forming part 232 is preferably determined in consideration of the dimension of the dent 72 (mainly the wall height) and the shape maintainability of the dent 72. The width 231W of the first dent forming part 231 is desirable. And the total sum of the widths 232W of the second dent forming portions 232 on both sides thereof is set to be about 1.5 to 2 times the width 231W of the first dent forming portions 231 and more specifically about 36 to 120 mm. Is desirable.

  The position in the front-rear direction of the second recess formation part 232 can be determined as appropriate, and the rear position of the first recess formation part 231 may be expanded to the side as shown in the illustrated example. It is also possible to extend and form. Although not shown, the first dent forming part 231 is extended to the front side of the second dent forming part 232, and the second dent forming part 232 at the rear position is formed on both sides in the width direction in a longitudinally symmetrical shape. A three-dent formation part may be added, and a pair of boat-shaped depressions may be configured so as to face each other with a narrow groove in the longitudinal direction in a mounted state (a substantially hourglass-shaped depression is formed).

  The shape of the second depression forming portion 232 may be a bent line shape as shown in the figure or a curved shape such as an arc shape. In the illustrated form, the boundary with the first dent forming part 231 is the lower bottom so that at least a part of the front side of the side edge of the second dent forming part 232 is located on the outer side in the width direction toward the rear side. The trapezoidal shape whose rear edge is orthogonal to the lower bottom (the shape including the second dent forming part 232 and the first dent forming part 231 therebetween is a pentagonal shape) is shown in FIG. 10 (a). A trapezoidal shape similar to the protruding portion 52 (the shape including the protruding portion 52 and the intermediate portion 51 therebetween is a hexagonal shape) can also be used. Moreover, the shape of the side edge of the 2nd hollow formation part 232 is located in the width direction outer side in steps like the overhang | projection part 52 shown, for example in FIG. Like the overhang portion 52 shown in FIG. 13 (b), the overhang portion 52 shown in FIG. 13 (c) may be formed in a shape such that a part of the front side is positioned on the outer side in the width direction toward the front side. It can also be made into a rectangular shape similarly to.

  In the example shown in FIG. 23 to FIG. 26, since there is no absorber 23 in a portion overlapping with the first dent forming portion 231, the urine diffusibility is good, but the passage formed by the first dent forming portion 231 is present. It is easily deformed and may be crushed. Therefore, if the diffusion sheet 63 that promotes the diffusion of urine in the front-rear direction is provided at the bottom of the first depression forming portion 231 following the first form, the passage by the first depression forming portion 231 is easily maintained, The diffusion of urine in the front-rear direction through the first depression forming portion 231 is promoted. Since the material and the modification of the diffusion sheet 63 are the same as those in the first embodiment, the description will be omitted.

  When the crotch part three-dimensional gather 40 is provided as in the first embodiment, the second dent forming part 232 is positioned between the non-standing parts 45 of the crotch part three-dimensional gather 40 in the front-rear direction (in other words, the second shape When the position in the width direction of the dent forming part 232 and the position in the width direction of the non-standing part 45 of the crotch part three-dimensional gather 40 overlap), the contraction force of the gather elastic elastic member 43 of the crotch part three-dimensional gather 40 is the second dent forming part 232. This is preferable because the formation of the above-described depression is promoted and the shape maintaining property of the depression is improved. However, the non-standing portion 45 of the crotch portion three-dimensional gather 40 may be located on the center side or the outer side in the width direction with respect to the second dent forming portion 232.

  In addition, the width direction position of the base end of the protruding portion 42 in the crotch portion three-dimensional gather 40 is desirably spaced laterally from the second dent forming portion 232 as illustrated, but the protruding portion 52 It can be aligned with the side edges or positioned within the overhang 52. Further, the position in the width direction of the tip of the protruding portion 42 in the crotch portion three-dimensional gather 40 is most preferably a position that passes over the second dent forming portion 232 in the unfolded state. By adopting these arrangements, the second dent forming part 232 is easily bent along the side edge to the back side, so that the formation and maintenance of the dent 72 is improved. Since others are the same as that of the crotch part gathers 40 in a 1st form, description is omitted dare.

(Other)
In the first to fourth embodiments described above, the absorber 23 has a two-layer structure or a single-layer structure, but may have three or more layers. Further, within the scope of the present invention, the surface dent formation regions 231 and 232 are formed by combining any one or more of the number of layers of the penetration portion, the thin portion (compression processing, low basis weight), and the absorber 23. Can do. Therefore, for example, in the absorber 23 having a multi-layer structure, it is also included in the present invention to provide only a thin portion as in the fourth embodiment without providing a through portion.
The surface depression formation regions 231 and 232 may be provided within the front-rear direction range of the crotch portion C2, but the first depression formation portion 231 particularly extends from the front side to the rear side of the scrotum arrangement region C1, and the second depression Desirably, the forming portion 232 extends rearward from a central position in the front-rear direction within the scrotum arrangement region C1 or from a rear position. Moreover, when it has the narrow part 23n with a narrow width | variety in the front-back direction middle of the absorber 23 like illustration form, it is in the front-back direction range which the width of the constriction part 23n expands toward back, or more than that It is preferable that the 1st hollow formation part 231 and the 2nd hollow formation part 232 are extended to back.

<Explanation of terms in the specification>
The following terms in the specification have the following meanings unless otherwise specified in the specification.
・ "Weight" is measured as follows. That is, a dimension of 100 mm × 100 mm (± 2 mm) is cut from the sample with a roll cutter. Measure the weight of the sample, calculate the weight per square meter, and use it as the basis weight.
・ "Thickness" uses a thickness measuring instrument (Peacock, dial thickness gauge large type, model JB (measurement range 0 to 35 mm) or model K-4 (measurement range 0 to 50 mm)) manufactured by Ozaki Mfg. Co., Ltd. Measure with the sample and thickness measuring device horizontal.

  INDUSTRIAL APPLICABILITY The present invention can be used for all disposable diapers such as a pad type, a pants type, or a tape type.

  B2 ... Rear side part, C1 ... Scrotum arrangement area, C2 ... Crotch part, F2 ... Front side part, 21 ... Liquid impervious sheet, 22 ... Top sheet, 23 ... Absorber, 23A ... Upper layer absorber, 23B ... Lower layer Absorber, 23n ... Constricted portion, 23w ... Single layer structure portion, 25 ... Intermediate sheet, 26 ... Exterior sheet, 30 ... Side solid gather, 31 ... Side solid gather sheet, 33 ... Gather elastic elastic member, 40 ... Crotch Three-dimensional gather, 42 ... projecting part, 43 ... gather elastic elastic member, 50 ... upper layer penetration part, 51 ... middle part, 52 ... overhang part, 60 ... lower layer penetration part, 63 ... diffusion sheet, 64 ... lower layer thin part, 231 ... 1st dent formation part, 232 ... 2nd dent formation part, 231, 232 ... Surface dent formation area.

Claims (8)

Having a crotch portion and a rear portion extending to the rear side of the crotch portion,
In the disposable diaper provided with an absorber that absorbs urine from the crotch part to the rear side part,
The absorbent body has a surface dent forming region consisting of at least one of a penetrating part and a thin part penetrating in the thickness direction at least in the center part in the width direction of the crotch part,
The surface dent forming region includes an elongated first dent forming part extending in the front-rear direction, and a second dent forming part projecting to both sides in the width direction of the front-rear direction intermediate position or the rear side position in the first dent forming part. And
The second embossing unit is the thin portion, the first embossing portion is Ri thin thin portion der than the through portion or the second embossing unit penetrating in the thickness direction,
The second embossing unit that extends from the front-rear direction central position or this position behind the scrotum arrangement region to the rear portion,
A disposable diaper characterized by that.   The disposable diaper according to claim 1, wherein the absorbent body has a single-layer structure. Having a crotch portion and a rear portion extending to the rear side of the crotch portion,
In the disposable diaper provided with an absorber that absorbs urine from the crotch part to the rear side part,
As the absorber, comprising a lower layer absorber, and an upper layer absorber provided on the lower layer absorber,
In the lower layer absorbent body, an elongated lower layer penetration part penetrating in the thickness direction is extended along the front-rear direction at least in the width direction central part of the crotch part,
The upper layer absorbent body is provided with an upper layer penetrating portion penetrating in the thickness direction within at least the front-rear direction range corresponding to the lower layer penetrating portion,
The upper layer penetrating portion is an elongated intermediate portion that is located on the lower layer penetrating portion and extends in the front-rear direction, and a projecting portion that projects on both sides in the width direction of the front-rear direction intermediate position or the rear position in the intermediate portion. Have
The overhanging portion extends from the center position in the front-rear direction of the scrotum arrangement region or from the rear position to the rear portion,
In the absorber, the region of the protruding portion of the upper layer penetrating portion is a single layer structure by the lower layer absorber, and the outer side in the width direction of the protruding portion of the upper layer penetrating portion is by the upper layer absorber and the lower layer absorber. It has a two-layer structure,
A disposable diaper characterized by that . The disposable diaper of Claim 3 provided with the diffusion sheet which promotes the spreading | diffusion of the urine of the front-back direction in the bottom of the said lower layer penetration part. Having a crotch portion and a rear portion extending to the rear side of the crotch portion,
In the disposable diaper provided with an absorber that absorbs urine from the crotch part to the rear side part,
As the absorber, comprising a lower layer absorber, and an upper layer absorber provided on the lower layer absorber,
In the lower layer absorbent body, at least in the width direction central portion of the crotch portion, an elongated lower layer thin portion extends along the front-rear direction,
The upper layer absorbent body is provided with an upper layer penetrating portion penetrating in the thickness direction within at least the front-rear direction range corresponding to the lower layer thin portion,
The upper layer penetrating portion is an elongated intermediate portion that is located on the lower thin portion and extends in the front-rear direction, and an overhang portion that protrudes on both sides in the width direction of the front-rear direction intermediate position or the rear position in the intermediate portion. Have
The overhanging portion extends from the center position in the front-rear direction of the scrotum arrangement region or from the rear position to the rear portion,
In the absorber, the region of the overhanging portion of the upper layer penetrating portion is a single layer structure other than the thin portion of the lower layer absorber, and the outer side in the width direction of the overhanging portion of the upper layer penetrating portion is the upper layer absorber and It is a two-layer structure with a lower layer absorber,
A disposable diaper characterized by that . Having a crotch portion and a rear portion extending to the rear side of the crotch portion,
In the disposable diaper provided with an absorber that absorbs urine from the crotch part to the rear side part,
As the absorber, comprising an upper layer absorber and a lower layer absorber provided below the upper layer absorber,
In the upper layer absorbent body, at least in the widthwise central part of the crotch part, an elongated upper layer penetrating part or upper thin part penetrating in the thickness direction is extended along the front-rear direction,
The lower layer absorber is provided with a lower layer penetrating portion penetrating in the thickness direction within at least the longitudinal direction range corresponding to the upper layer penetrating portion or the upper layer thin portion,
The lower layer penetrating portion includes an elongated middle portion that is positioned below the upper layer penetrating portion or the upper thin portion and extends in the front-rear direction, and a tension projecting on both sides in the width direction of the middle position in the front-rear direction or the rear position. And has a protruding portion,
The overhanging portion extends from the center position in the front-rear direction of the scrotum arrangement region or from the rear position to the rear portion,
In the absorber, the region of the protruding portion of the lower layer through portion is a single layer structure other than the single layer structure of the upper layer absorber or the thin portion of the upper layer absorber, and the width direction of the protruding portion of the lower layer through portion The outside is a two-layer structure with the lower layer absorber and the upper layer absorber,
A disposable diaper characterized by that . The disposable diaper according to any one of claims 3 to 6 , wherein a side edge of the projecting portion is shaped to be positioned at the outer side in the width direction as at least a part of the front side is directed toward the rear side. The disposable diaper according to any one of claims 3 to 7 , wherein the projecting portion has a trapezoidal shape with a boundary with an intermediate portion as a bottom.