JP2014193210A - Disposable diaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disposable diaper which is excellent not only in a reversion preventing performance but also in an absorption rate.SOLUTION: A disposable diaper having an absorber 23 provided between a top sheet 22 and a liquid impermeable sheet 21 comprises: a hard percolation intermediate sheet 25 provided on the upper side of the absorber 23 for covering at least the entire widthwise intermediate and longitudinal intermediate areas in the absorber 23. Urine permeable holes 40 extending in a front-back direction are formed in the hard percolation intermediate sheet 25, and a urine introduction space 30 composed of a through portion extending from the front to the back is formed at a portion of the absorber 23 partially or wholly overlapping the urine permeable holes 40.

Description

  The present invention relates to a disposable diaper.

  In the disposable diaper, various absorption performances are required, and one of the typical ones has a reversing performance. Reversal is a phenomenon in which urine once absorbed by the absorber returns to the surface of the article again, and if it is easy to reverse, the skin touches urine unnecessarily, and rashes and pressure ulcers occur during prolonged use such as at night. Since there is a risk of causing it, what is difficult to reverse is desired. In particular, such demands are common for disposable diapers for adults.

  For reversing, generally, a solution in which optimization of materials such as a surface sheet, an intermediate sheet (intervened between the absorber and the surface sheet), and an absorber is widely used (for example, patent document) However, a solution such as providing a water repellent portion on the top sheet (see, for example, Patent Document 2) has also been proposed.

JP 2007-130504 A JP 2011-189065 A JP 2007-203096 A

  However, there is still room for improvement with respect to reversal, and in particular, it is difficult to achieve both reversal prevention performance and absorption speed.

  Then, the main subject of this invention is providing the disposable diaper which is not only excellent in the reversion prevention performance but is excellent also in an absorption rate.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
In a disposable diaper comprising a liquid-permeable top sheet, a liquid-impermeable sheet, and an absorbent body provided therebetween,
On the upper side of the absorber, a water-impermeable layer that covers the entire region at least in the width direction intermediate and the front-rear direction in the absorber is provided,
A urine permeation hole penetrating in the front and back direction is formed in the hardly water-permeable layer,
A urine introduction space consisting of a penetrating part penetrating the front and back or a recessed part recessed from the surface toward the back side is formed in a part of the absorbent body that partially or entirely overlaps the urine permeation hole,
A disposable diaper characterized by that.

(Function and effect)
In the present invention, urine excreted on the surface of the diaper enters the urine introduction space of the absorber through the urine permeation hole of the hardly water-permeable layer, is absorbed by the absorber from this urine introduction space, and diffuses to the surroundings. Even if the urine absorbed by the absorber returns to the diaper surface, it is blocked by the poorly permeable layer except on both sides except for the part that overlaps the urine permeation hole. Is prevented. The portion of the urine introduction space that overlaps the urine permeation hole is not covered by the poorly permeable layer, but even if urine oozes into the urine introduction space due to pressure applied to the absorber, the bottom surface of the urine introduction space Since it is separated from the top sheet, it does not return to the top sheet.
In addition, since the urine introduction space is formed in the absorber, a temporary urine storage space is formed under the top sheet, so that the absorption rate is also excellent.
The hardly water-permeable layer means a layer having a lower water permeability than the water permeability in a portion of the diaper urine absorption region that does not have the hardly water-permeable layer, and includes a water-impermeable layer.

<Invention of Claim 2>
The disposable diaper according to claim 1, wherein a peripheral edge of the urine permeation hole is along a peripheral edge of the urine introduction space.

(Function and effect)
By substantially matching the urine permeation hole and the urine introduction space in this way, the intermediate portion in the width direction of the absorbent body is substantially entirely covered except for the urine introduction space, so that the action of preventing reversion is further enhanced. In addition, the absorption rate is not impaired.

<Invention of Claim 3>
Three-dimensional gathers are extended along the front-rear direction on both sides in the width direction of the surface of the diaper,
The three-dimensional gathers are provided at the root portion fixed to the side portion of the diaper, the protruding portion protruding from the root portion, and the front and rear end portions of the protruding portion, respectively, and with respect to the surface of the main body portion in the lying state Gather elastic stretch fixed in a stretched state in the front-rear direction at a fixed lodging part, an unfixed free part located between the front and rear lodging parts of the projecting part, and at least a tip part of the free part Having a member,
In the unfolded state, the hardly permeable layer extends laterally to a position hidden by the three-dimensional gather, and in the unfolded state, the position hidden by the three-dimensional gather, the hardly permeable water between the top sheet and the absorber. The disposable diaper of Claim 1 or 2 with which the side permeation | transmission part which does not have a layer is provided.

(Function and effect)
Thus, by providing the side permeation part at a position hidden in the three-dimensional gather, urine that diffuses without being introduced into the urine permeation hole can be introduced from the side permeation part and absorbed by the absorber, and the absorbed urine However, even if it is reversed from the side transmission part, the side transmission part is hidden in the three-dimensional gather, so that the skin can be prevented from getting wet. In addition, by extending the poorly permeable layer in the width direction to a position hidden by the three-dimensional gather, it becomes difficult to touch the skin without the hardly permeable layer at the time of wearing, and the reversal prevention property is excellent.

<Invention of Claim 4>
The disposable diaper of Claim 3 with which the urine guide wire is extended from the width direction center part in the said top sheet to the said side permeation | transmission part.

(Function and effect)
By providing such a urine guide wire on the top sheet, diffusion of urine toward the side transmission part is promoted.

<Invention of Claim 5>
Three-dimensional gathers are extended along the front-rear direction on both sides in the width direction of the surface of the diaper,
The three-dimensional gathers are provided at the root portion fixed to the side portion of the diaper, the protruding portion protruding from the root portion, and the front and rear end portions of the protruding portion, respectively, and with respect to the surface of the main body portion in the lying state Gather elastic stretch fixed in a stretched state in the front-rear direction at a fixed lodging part, an unfixed free part located between the front and rear lodging parts of the projecting part, and at least a tip part of the free part Having a member,
A rear part having an attachment part fixed to the top sheet surface on the rear side of the urine permeation hole, and an extension part extending forward from the attachment part and having both sides connected to the three-dimensional gather The disposable diaper according to any one of claims 1 to 3, wherein a diffusion suppression sheet is provided.

(Function and effect)
In the present invention, since urine is absorbed mainly through the urine permeation hole and the urine introduction space, a back diffusion suppression sheet is provided behind the absorption position, and the excreted urine is temporarily placed in the absorption position. Storage (that is, until absorption through the urine permeation hole and the urine introduction space) is preferable because urine can be prevented from moving backward without being absorbed and causing leakage.

<Invention of Claim 6>
The absorber extends from the front side of the urination position to the buttock facing portion, the urine permeation hole and the urine introduction space, and the back diffusion suppression sheet are provided on the front side of the buttock facing portion,
In the unfolded state, the side edge of the back diffusion suppressing sheet is spaced from the root portion of the solid gather to the front end side, and passes between the solid gather and the top sheet to the side of the back diffusion suppressing sheet. A longitudinal passage communicating in the longitudinal direction is formed,
The disposable diaper according to claim 5.

(Function and effect)
When aiming at pressure ulcer prevention, it is not preferable that urine adheres to the buttocks. Therefore, it is desirable to provide the urine permeation hole, the urine introduction space, and the rear diffusion suppression sheet on the front side of the buttock-opposing portion. This may cause leakage. Therefore, it is desirable to leave the front-rear direction passages on both sides in the width direction of the back diffusion suppressing sheet as described above, and to move the urine to the buttocks-facing portion side to the extent that leakage does not occur.

<Invention of Claim 7>
The urine permeation hole and the urine introduction space have a shape having at least a central portion extending in the front-rear direction from the urination position to the rear side thereof, and a branching portion extending from the central portion to both sides in the width direction and extending in the rear oblique direction. The disposable diaper according to any one of claims 1 to 6, wherein:

(Function and effect)
By making the urine permeation hole and the urine introduction space into such a shape, the diffusion of urine in the front-rear direction and the width direction is promoted, and the absorption rate is further increased.

  As described above, according to the present invention, there are advantages such as a disposable diaper that not only has excellent reversion prevention performance but also has an excellent absorption rate.

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 only the principal part. It is YY sectional drawing of FIG. It is ZZ sectional drawing of FIG. It is XX sectional drawing of FIG. It is VV sectional drawing of FIG.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. The term “groin” in the terminology of the present invention means a part that corresponds to the crotch of the body at the time of use, and depending on the product, from the center in the front-rear direction of the article as shown in the figure to the predetermined part on the front side. Range, or a predetermined range at the center in the front-rear direction of the article. In the case of having 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, it means a predetermined front-rear direction range having the minimum width portion of one or both constricted portions in the center in the front-rear direction. 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.

  1-6 has shown the pad type disposable diaper example 200 which concerns on this invention. 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 (length in the front-rear direction) L is about 350 to 700 mm, and the total width W1 is about 130 to 400 mm (however, wider than the width of the absorbent surface of the diaper). In this case, the length of the crotch portion C2 in the front-rear direction is about 10 to 150 mm, the length of the front portion F2 is about 50 to 350 mm, and the length of the rear portion B2 is about 50 to 350 mm. be able to.

  The pad-type disposable diaper 200 has a basic structure in which an absorber 23 is interposed between an inner surface of a liquid-impervious liquid-impermeable sheet 21 having an outer sheet 32 laminated on the outer surface and a liquid-permeable top sheet 22. have.

  On the back side of the absorber 23, a liquid-impermeable liquid-impermeable sheet 21 is provided so as to protrude slightly from the peripheral edge of the absorber 23. As the liquid-impermeable 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 liquid-impermeable sheet 21 is covered with an exterior sheet 32 made of a nonwoven fabric, and the exterior sheet 32 has a predetermined protrusion width from the periphery of the liquid-impermeable sheet 21. It is sticking out to the outside. Various nonwoven fabrics can be used as the exterior sheet 32. As the material fiber constituting the nonwoven fabric, synthetic fibers such as polyethylene or polypropylene, synthetic fibers such as polyester and amide, recycled fibers such as rayon and cupra, and natural fibers such as cotton can be used.

  The surface 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 nonwoven fabric, synthetic fibers such as polyethylene or polypropylene, synthetic fibers such as 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 reversing. The intermediate sheet 25 is water retentive in a case other than the case where the intermediate sheet 25 is a non-water-permeable layer (described later), that is, in a normal case. It is desirable to use a material having a low liquid permeability and a high liquid permeability, such as various nonwoven fabrics and mesh films. 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 W4 of the intermediate sheet 25 is preferably about 50 to 90% of the minimum width W3 of the absorber 23.

  At both ends in the front-rear direction of the pad-type disposable diaper 200, the exterior sheet 32, the liquid-impermeable sheet 21, and the liquid-permeable top sheet 22 are respectively attached to the front and rear ends of the absorbent body 23 so as to extend and bonded together. An end flap portion EF in which the body 23 does not exist is formed. In both side portions of the pad type disposable diaper 200, the exterior sheet 32 and the liquid-impermeable sheet 21 are extended outward from the side edges of the absorber 23, and the portions from the extended portion to the side portion of the top sheet 22 are provided. On the inner surface, a portion 24x on the outer side in the width direction of the gather sheet 24s constituting the three-dimensional gather 24 is attached over the entire front and rear direction (this portion becomes the root portion of the three-dimensional gather 24), and the side flaps where the absorber 23 does not exist Part SF is configured. These affixed portions can be formed by hot melt adhesive, heat seal, or ultrasonic seal, and in the figure, other members, including other portions, are fixed to each other, joined portions, and their means are indicated by dot patterns. When the exterior sheet 32 is not provided, the liquid-impervious liquid impervious sheet 21 can be extended to the side flap part SF instead of the exterior sheet 32 to form the outer surface side of the side flap part SF.

  As a material for the gather sheet 24s, a plastic sheet or a melt-blown nonwoven fabric can be used, but from the viewpoint of touch to the skin, a nonwoven fabric that is water-repellent treated with silicon or the like is preferably used.

  A portion 24c on the center side in the width direction of the gather sheet 24s extends to the top sheet 22, and an elongated elastic member 24G is stretched along the front-rear direction at the end portion on the center side in the width direction. It is fixed with a melt adhesive or the like. As the elongated elastic member 24G, styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicon, polyester, etc., which are formed in a thread shape, a string shape, a belt shape, or the like. Ordinarily used materials can be used.

  Further, both gather sheets 24s are fixed with the width-direction outer portion 24x being bonded and fixed to the liquid-impermeable sheet 21 over the entire front-rear direction, and the width-direction central side portion 24c is lying down at both ends in the front-rear direction. In the state, it is bonded and fixed to the inner surface of the article (the surface of the top sheet 22 in the illustrated embodiment), and is not fixed to the inner surface of the article (the surface of the top sheet 22 in the illustrated embodiment) between both ends in the front-rear direction. As shown in FIG. 4B, the non-fixed portion is a portion that becomes a barrier portion that can stand up with respect to the inner surface of the article (the surface of the top sheet 22 in the illustrated form), and the standing base end 24b is a gather sheet. It is located at the boundary between the fixed portion 24x on the outer side in the width direction at 24s and the inner portion 24c.

  The absorbent body 23 is basically made of a pulp fiber pile, an aggregate of filaments such as cellulose acetate, or a non-woven fabric, and is obtained by mixing, adhering, etc., a superabsorbent polymer such as particulates as necessary. Can be used. The absorbent body 23 can be wrapped with a wrapping sheet 26 such as crepe paper (not shown in the cross-sectional view) as necessary, such as when mixing superabsorbent polymer particles. Moreover, the shape of the absorber 23 can be set to an appropriate shape such as a strip shape in which the front portion is relatively narrower than the rear portion, a rectangular shape, or a trapezoidal shape.

  The absorber 23 may have a single layer structure as shown in the drawing, or a laminated structure of a plurality of layers.

The fiber basis weight and the basis weight of the superabsorbent polymer in the absorbent body 23 can be appropriately determined, but the fiber basis weight is preferably about 100 to 600 g / m ^2, and the basis weight of the absorbent polymer is about 0 to 400 g / m ^2. It is preferable that

  In the absorber 23B, a predetermined portion in the middle in the front-rear direction including the crotch portion C2 is 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 W2 of the non-constricted portion located before and after the constricted portion 23n. When the front end of the article is 0% and the rear end of the article 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%.

  Characteristically, by forming the intermediate sheet 25 from a water-repellent or hydrophobic sheet, the intermediate sheet 25 is made to be a hardly water-permeable layer (hereinafter referred to as a hardly water-permeable intermediate sheet 25), and A urine permeation hole 40 penetrating in the front and back direction is formed in the sheet 25, and a penetrating part penetrating through the front and back (or from the surface toward the back side) is further formed in a part of the absorbent body 23 that overlaps with the urine permeation hole. A urine introduction space 30 is formed.

  The urine excreted on the surface of the diaper passes through the urine permeation hole 40 of the hardly water-permeable intermediate sheet 25 and enters the urine introduction space 30 of the absorber 23 as shown by a two-dot chain line in FIGS. It is absorbed from the introduction space 30 into the absorber 23 and diffuses around. Even if the urine absorbed by the absorber 23 returns to the diaper surface, the urine is diffused around the urine introduction space 30 because the urine is blocked by the hardly water-permeable intermediate sheet 25 except for both sides except for the portion overlapping the urine permeation hole 40. Urine reversion is prevented. Further, the portion of the urine introduction space 30 that overlaps with the urine permeation hole 40 is not covered by the hardly water permeable intermediate sheet 25, but even if urine oozes into the urine introduction space 30 due to pressure applied to the absorber 23 or the like. In addition, since the bottom surface of the urine introduction space 30 is separated from the top sheet 22, it does not return to the top sheet 22. In addition, since the urine introduction space 30 is formed in the absorber 23, a temporary urine storage space is formed under the top sheet 22, so that the absorption speed is also excellent.

  As the poorly water-permeable layer of the present invention, a water-repellent material (for example, an intermediate sheet 25 (illustrated form) disposed on the upper side of the absorber 23 or a part or the whole of the packaging sheet 26 itself, for example, (Silicon, paraffin, alkylchromic chloride water repellent, etc.) is preferably applied to make the water repellent application portion of the material a hardly water permeable layer. It may be pasted between materials. However, when a water-repellent agent is applied to the top sheet 22 or a poorly water-permeable film is applied on the top sheet 22, the urine does not penetrate from the surface and easily leaks. It is preferable to apply a water repellant to a liquid-permeable material, for example, the intermediate sheet 25 interposed between them to form a hardly water-permeable layer.

  The poorly water-permeable layer of the present invention is not particularly limited as long as it is provided so as to cover at least the entire region in the middle in the width direction and the middle in the front-rear direction of the absorber 23, but it is desirable to cover a wider range, and the absorber 23 is located at the urination position. In a normal disposable diaper extended from the front side to the buttocks-facing portion, it is desirable to cover the absorber 23 from the front end to the rear end. For this reason, in the case of the illustrated form, the hardly water-permeable intermediate sheet 25 covers the middle of the absorbent body 23 in the width direction and the entire front-rear direction. Specific dimensions are as described above.

  The positions of the urine permeation hole 40 and the urine introduction space 30 can be determined as appropriate. However, in a normal disposable diaper in which the absorber 23 extends from the front side of the urination position to the buttocks-facing portion, the urine permeation hole 40 and the urine introduction hole It is desirable that the space 30 is located in front of the buttock facing portion. Although the urine permeation hole 40 and the urine introduction space 30 are single in the illustrated embodiment, a plurality of urine permeation holes 40 and a plurality of urine introduction spaces 30 may be provided at intervals.

  The positional relationship between the urine permeation hole 40 and the urine introduction space 30 can be determined as appropriate. For example, one can have a shape that extends in the front-rear direction and the other has a shape that extends in the width direction. When the peripheral edge of the permeation hole 40 is aligned with the peripheral edge of the urine introduction space 30, in other words, when the urine permeation hole 40 and the urine introduction space 30 are substantially matched, the intermediate portion in the width direction of the absorber 23 becomes the urine introduction space. Since the whole is substantially covered except for 30, it is preferable because the anti-reverse effect is further improved and the absorption rate is not impaired.

  The shapes of the urine permeation hole 40 and the urine introduction space 30 can be determined as appropriate, for example, a rectangular shape extending in the front-rear direction or the width direction, a square shape, a polygonal shape, an elliptical shape, or the like. In particular, as shown in the figure, the urine permeation hole 40 and the urine introduction space 30 are branched at the center part extending along the front-rear direction at least from the urination position to the rear side thereof, and branched from the center part to both sides in the width direction. When the shape has a branching portion extending in an oblique direction, diffusion of urine in the front-rear direction and the width direction is promoted, and the absorption rate is further increased.

  The dimensions of the urine permeation hole 40 and the urine introduction space 30 can be appropriately determined according to the shape, but in the case of an elongated shape (the same applies when the elongated portion is used as a component as shown in the figure) In general, the width is preferably in the range of 5 to 20 mm, particularly preferably in the range of 10 to 15 mm. If this width is too narrow, urine will be difficult to be introduced, and if it is too wide, not only will the amount of absorption be reduced, but the absorber 23 will likely be deformed.

  If it is attempted to ensure the absorption rate only by the combination of the urine permeation hole 40 and the urine introduction space 30 of the hardly water-permeable intermediate sheet 25, the anti-reverse performance may be impaired. Therefore, as shown in the figure, in the unfolded state, the hardly water-permeable intermediate sheet 25 extends to the side hidden by the three-dimensional gather 24, and in the unfolded state, the position hidden by the three-dimensional gather 24, the top sheet 22 and A form is also proposed in which a side transmission portion 41 that does not have the hardly water-permeable intermediate sheet 25 is provided between the absorber 23 and the absorber 23. By providing the side transmission part 41 at a position hidden in the three-dimensional gather 24 in this way, as shown by a two-dot chain line in FIGS. 4 and 5, urine that diffuses without being introduced into the urine transmission hole 40 is side transmission part 41. Can be absorbed by the absorbent body 23, and even if the absorbed urine returns from the side transmission part 41, the side transmission part 41 is hidden in the three-dimensional gather 24, so that the skin can be prevented from getting wet. . Further, by extending the hardly water-permeable intermediate sheet 25 in the width direction to a position hidden by the three-dimensional gather 24, it becomes difficult to touch a portion of the skin that does not have the hardly water-permeable intermediate sheet 25 at the time of wearing, and has excellent reversal prevention properties. .

  In addition, although the side permeation | transmission part 41 may be formed by providing a hole in the hardly water-permeable intermediate sheet 25, from a viewpoint of material cost or manufacturability, like the illustrated form, the hardly water-permeable intermediate sheet 25 is It extends in the width direction only up to a position hidden in the three-dimensional gather 24 and further away from the boundary between the root portion and the protruding portion in the width direction, and the side edge of the hardly water-permeable intermediate sheet 25 and the three-dimensional gather It is desirable that the side permeation portion 41 that does not have the hardly water-permeable intermediate sheet 25 between the top sheet 22 and the absorbent body 23 is formed between the base portion of 24.

  On the other hand, in the present invention, since urine is absorbed mainly through the urine permeation hole 40 and the urine introduction space 30, there is a possibility that urine that cannot be absorbed there will move backward, causing leakage and adhesion to the skin. Therefore, as shown in the figure, the attachment portion 51 fixed to the surface of the top sheet 22 on the rear side of the urine permeation hole 40, and the portion extending from the attachment portion to the front side and both side portions to the three-dimensional gather 24. It is desirable to provide a back diffusion suppression sheet 50 having an extended portion 52 connected thereto. Thereby, the excreted urine can be temporarily stored in the absorption position (that is, until absorption through the urine permeation hole 40 and the urine introduction space 30 is performed), and the backward movement of the unabsorbed urine can be prevented ( (See FIG. 6).

  It is preferable to fix the elongated elastic stretchable member 53 in the extended state along the width direction at the front end portion of the back diffusion suppressing sheet 50 because the back diffusion suppressing sheet 50 rises firmly and provides an elastic fit. Even without the elongated elastic elastic member, it is pulled up by the rising force of the three-dimensional gather 24 and rises.

  The back diffusion suppression sheet 50 can be provided at any position in the front-rear direction as long as it is behind the urine permeation hole 40, but it is not preferable that urine adheres to the buttocks for the purpose of preventing pressure ulcers. It is desirable to provide the urine permeation hole 40, the urine introduction space 30, and the rear diffusion suppression sheet 50 in front of the buttock-opposing portion. However, in that case, depending on the amount of urination and the rate of urination, there is a possibility that leakage may occur because the amount of storage on the front side of the back diffusion suppression sheet 50 is small. Therefore, as shown in the figure, in the unfolded state, the side edge of the rear diffusion suppressing sheet 50 is separated from the base portion of the three-dimensional gather 24 toward the tip side, and the three-dimensional gather 24 and the top sheet are located on the side of the rear diffusion suppressing sheet 50. It is desirable to leave the front-rear direction passage 54 (see FIG. 5) that passes between the two parts 22 and communicates in the front-rear direction, and to move the urine to the buttocks-facing portion side to the extent that leakage does not occur.

  On the other hand, when the urine guide wire 60 is provided from the center part in the width direction of the top sheet 22 to the side transmission part 41 together with the back diffusion suppression sheet 50 (illustrated form) or instead of this, the urine flowing toward the side transmission part 41 is provided. Diffusion is promoted and the absorption rate can be improved. The urine guide wire 60 is not particularly limited as long as it induces urine along the continuous direction. For example, the urine guide wire 60 is formed by linearly applying a water repellent agent to the top sheet 22 and the like. A configuration in which urine is induced by a difference in hydrophilicity, or a configuration in which urine is guided by a groove on the surface of the top sheet 22 by embossing can be employed.

  The urine guide wires 60 are preferably provided in a plurality of rows at intervals in the front-rear direction as shown in the figure, but may be only one row. In addition, the urine guide wire 60 is preferably located behind the urine permeation hole 40, particularly when it is provided with the back diffusion suppression sheet 50, the urine guide wire 60 is positioned behind the urine permeation hole 40. It may be provided in front of 40, or in a position partially overlapping with the urine permeation hole 40. Therefore, when the backward diffusion suppression sheet 50 is provided, it may be provided in front thereof.

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

  DESCRIPTION OF SYMBOLS 21 ... Liquid impervious sheet, 22 ... Top sheet, 23 ... Absorber, 24 ... Solid gather, 25 ... Intermediate sheet, 26 ... Packaging sheet, 32 ... Outer sheet, 200 ... Pad type disposable diaper, 40 ... Urine permeable hole , 30 ... Urine introduction space, 41 ... Side transmission part, 50 ... Back diffusion suppression sheet, 54 ... Front-rear direction passage, 60 ... Urine guide wire.

Claims (7)

In a disposable diaper comprising a liquid-permeable top sheet, a liquid-impermeable sheet, and an absorbent body provided therebetween,
On the upper side of the absorber, a water-impermeable layer that covers the entire region at least in the width direction intermediate and the front-rear direction in the absorber is provided,
A urine permeation hole penetrating in the front and back direction is formed in the hardly water-permeable layer,
A urine introduction space consisting of a penetrating part penetrating the front and back or a recessed part recessed from the surface toward the back side is formed in a part of the absorbent body that partially or entirely overlaps the urine permeation hole,
A disposable diaper characterized by that.   The disposable diaper according to claim 1, wherein a peripheral edge of the urine permeation hole is along a peripheral edge of the urine introduction space. Three-dimensional gathers are extended along the front-rear direction on both sides in the width direction of the surface of the diaper,
The three-dimensional gathers are provided at the root portion fixed to the side portion of the diaper, the protruding portion protruding from the root portion, and the front and rear end portions of the protruding portion, respectively, and with respect to the surface of the main body portion in the lying state Gather elastic stretch fixed in a stretched state in the front-rear direction at a fixed lodging part, an unfixed free part located between the front and rear lodging parts of the projecting part, and at least a tip part of the free part Having a member,
In the unfolded state, the hardly permeable layer extends laterally to a position hidden by the three-dimensional gather, and in the unfolded state, the position hidden by the three-dimensional gather, the hardly permeable water between the top sheet and the absorber. The disposable diaper of Claim 1 or 2 with which the side permeation | transmission part which does not have a layer is provided.   The disposable diaper of Claim 3 with which the urine guide wire is extended from the width direction center part in the said top sheet to the said side permeation | transmission part. Three-dimensional gathers are extended along the front-rear direction on both sides in the width direction of the surface of the diaper,
The three-dimensional gathers are provided at the root portion fixed to the side portion of the diaper, the protruding portion protruding from the root portion, and the front and rear end portions of the protruding portion, respectively, and with respect to the surface of the main body portion in the lying state Gather elastic stretch fixed in a stretched state in the front-rear direction at a fixed lodging part, an unfixed free part located between the front and rear lodging parts of the projecting part, and at least a tip part of the free part Having a member,
A rear part having an attachment part fixed to the top sheet surface on the rear side of the urine permeation hole, and an extension part extending forward from the attachment part and having both sides connected to the three-dimensional gather The disposable diaper according to any one of claims 1 to 3, wherein a diffusion suppression sheet is provided. The absorber extends from the front side of the urination position to the buttock facing portion, the urine permeation hole and the urine introduction space, and the back diffusion suppression sheet are provided on the front side of the buttock facing portion,
In the unfolded state, the side edge of the back diffusion suppressing sheet is spaced from the root portion of the solid gather to the front end side, and passes between the solid gather and the top sheet to the side of the back diffusion suppressing sheet. A longitudinal passage communicating in the longitudinal direction is formed,
The disposable diaper according to claim 5.   The urine permeation hole and the urine introduction space have a shape having at least a central portion extending in the front-rear direction from the urination position to the rear side thereof, and a branching portion extending from the central portion to both sides in the width direction and extending in the rear oblique direction. The disposable diaper according to any one of claims 1 to 6, wherein:

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