JP5544100B2 - Absorbent articles - Google Patents

Description

  The present invention relates to an absorbent article.

  Absorbent articles are required to have various absorption performances, and one of the typical examples is reversal 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, there is a problem that the skin becomes unnecessarily soiled with excrement, so that it is difficult to reverse It is desired. In particular, such demands are often found in absorbent articles such as disposable diapers and absorbent pads for adults. Various solutions to such reversal have also been proposed (see, for example, Patent Documents 2 and 3), and are optimal as materials for surface sheets, intermediate sheets (intervened between the absorber and the surface sheet), absorbers, etc. It has been generally performed to use a new one.

  On the other hand, in order to make it difficult to reverse urine, a second mesh film (hereinafter simply referred to as “mesh film”) is used as the intermediate sheet, and the absorber is separated into a lower layer absorber and an upper layer absorber. It was also considered to be a structure. However, in conventional adult paper diapers that employ a mesh film and a two-layer absorber, the mesh film may cause urine absorption inhibition. Therefore, slits are provided in the lower absorber and the upper absorber, respectively. Thus, a structure in which the absorbency is enhanced by the slits has been adopted.

  In the conventional structure, with the presence of this slit, an absorber having only a pulp layer is adopted as the upper absorbent body so that the portion separated by the slit of the upper absorbent body is not wrapped with a core wrap.

JP 2005-198598 A Special table 2004-512862 gazette JP-T-2004-500932

However, when a slit is provided in each of the lower layer absorber and the upper layer absorber and the upper layer absorber is not wrapped with the core wrap, the space due to the slit exists in these absorbers, and the upper layer absorber is not wrapped with the core wrap. For this reason, the rigidity of the absorber has been reduced. As a result, when the amount of urination is high, there is a problem that the shape of the absorber may be broken due to the weight of urination.
Then, the main subject of this invention is providing the absorbent article which can prevent the collapse of an absorber.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
It has a front part and a rear part extending to the front side and the rear side of the crotch part,
A lower layer absorber extending in the front-rear direction from at least the crotch portion to the rear side portion is provided, and on the lower layer absorber, the width is narrower than that of the lower layer absorber and at least from the crotch portion to the rear side portion in the front-rear direction. In an absorbent article provided with an extended upper layer absorbent body,
The lower layer absorbent body is formed as a narrow constricted portion with a predetermined portion in the middle in the front-rear direction including the crotch portion,
Upper and lower slits penetrating the front and back surfaces of the upper-layer absorbent body on both the left and right sides of the center line in the width direction of the upper-layer absorbent body are respectively extended from the rear side portion to the rear side portion from the urination port portion in the crotch portion , and urinating It does not extend to the mouth and its front side ,
The upper layer slit extends so as to be positioned more outward in the width direction toward the rear side at the rear side than the rear side widening start position at which the width starts to increase toward the rear side of the constricted portion of the lower layer absorber. An existing diffusion promoting portion and an introduction portion continuous to the front side of the diffusion promoting portion;
A mesh film having liquid permeability is disposed on the upper side of the upper layer absorber, the upper surface of the upper layer slit from the introduction part to the diffusion promoting part is covered with the mesh film, and both side edges of the mesh film are Located on the center side in the width direction from both side edges of the upper layer absorbent body,
The lower layer absorber does not have a slit at a position overlapping with at least the upper layer slit,
An absorbent article characterized by the above.

(Function and effect)
According to the knowledge of the present inventor, a mesh film having liquid permeability is disposed on the upper side of the upper layer absorbent body, and the upper surface of the upper layer slit is covered with the mesh film, and the upper layer absorbent body and the lower layer absorbent body. The structure which provided the slit only in the upper layer absorber was employ | adopted. As a result, the diffusion path of urine is secured by the upper slit, and the urine that has reached the absorber locally in the crotch diffuses back along the upper slit, and the diffusion of the upper slit is promoted during this diffusion process. Urine diffuses along the portion to the outside in the width direction.

  Furthermore, in this claim, since the upper layer slits are respectively extended from the crotch part to the rear part, which is a part of the buttocks where body pressure is applied, urine is efficiently diffused even when body pressure is applied. Further, on the rear side of the rear side widening start position, it extends so as to be located on the outer side in the width direction as it goes to the rear side, or the upper layer slit from the center side in the width direction toward the outer side in the width direction along the width direction. Therefore, urine can be efficiently diffused in a wide absorbent body of the buttocks.

  And since the urine is absorbed and diffused by the upper layer absorber and the lower layer absorber in a wide range in the width direction with respect to the wider lower layer absorber, the urine reverts in combination with the provision of the mesh film. It becomes difficult. On the other hand, in this claim, since the slit is provided only in the upper-layer absorber, and the slit is not provided in the lower-layer absorber, the strength of the entire absorber is ensured, and the crotch portion where the absorber is most likely to collapse. By positively absorbing urine from the crotch portion other than the rear portion, it is possible to prevent the absorber from being damaged due to the weight of urination.

<Invention of Claim 2>
The upper-layer absorber is laminated on the lower-layer absorber so that the lower-layer absorber and the upper-layer absorber are in direct contact, and a core wrap integrally wraps the lower-layer absorber and the upper-layer absorber. The absorbent article according to claim 1.

(Function and effect)
The above effect of preventing the absorber breakage due to the weight of urination is further enhanced by the core wrap integrally wrapping the lower layer absorber and the upper layer absorber in such a form that the lower layer absorber and the upper layer absorber are in direct contact with each other. It will be a thing.

<Invention of Claim 3>
The absorbent article according to claim 1, wherein the upper layer absorbent is formed of pulp and polymer, and the ratio of pulp / polymer in the upper layer absorbent is 1.5 or more.

(Function and effect)
Thus, the upper layer absorbent body is formed of pulp and polymer, and the ratio of the polymer to the pulp is reduced as the ratio of the pulp / polymer in the upper layer absorbent body is 1.5 or more. Absorber makes it difficult to absorb urine. As a result, it is possible to positively absorb urine in a portion of the lower layer absorbent body other than the crotch part where the absorbent body is most likely to be broken, thereby preventing the collapse of the absorbent body more reliably.

<Invention of Claim 4>
The absorbent article according to claim 1, wherein the upper layer absorbent body is formed only of pulp.

(Function and effect)
As described above, as the upper layer absorber is formed only of pulp, and the polymer is not present in the upper layer absorber, it becomes difficult to absorb urine by this upper layer absorber. Urine is actively absorbed by the lower layer absorbent body other than the crotch part where the body tends to collapse, so that the collapse of the absorbent body can be prevented more reliably.

  As described above, according to the absorbent article of the present invention, an excellent effect of preventing the absorber from being broken is produced.

It is a top view which shows the inner surface side of the expansion | deployment state of a tape-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 a top view which shows only the principal part of FIG. It is sectional drawing corresponding to FIG. 3 of a modification.

  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.

  1-4 show an example absorbent pad 200 according to the present invention. The absorbent pad 200 has a crotch portion C2 and a front side portion F2 and a rear side 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) M is about 350 to 700 mm, and the total width W1 is about 130 to 400 mm (however, narrower than the width of the diaper absorbing surface). 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 absorbent pad 200 has a basic structure in which an absorber 23 is interposed between an inner surface of a liquid-impermeable back sheet 21 having an outer sheet 32 laminated on the outer surface and a liquid-permeable top sheet 22. .

  That is, the liquid-impervious backsheet 21 formed much larger than the absorber 23 is provided on the back surface side of the absorber 23. As the liquid-impermeable back sheet 21, in addition to a polyethylene film or the like, a sheet having moisture permeability can be used without impairing water shielding 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.

  Further, the outer surface of the liquid-impermeable back sheet 21 is covered with an exterior sheet 32 made of a nonwoven fabric, and this exterior sheet 32 protrudes outside the periphery of the back sheet 21 with a predetermined protrusion width. Yes. 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.

  An intermediate sheet 25 that is a mesh film is interposed between the top sheet 22 and the absorber 23. That is, the intermediate sheet 25 is provided to prevent the urine that has been absorbed by the absorber 23 from returning, and is formed of a mesh film that is a material having low water retention and high liquid permeability.

  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%. Moreover, it is preferable that the width | variety 25w of the intermediate sheet 25 is about 50 to 90% of the width | variety L2 of the upper layer absorber 23U mentioned later.

  At both ends in the front-rear direction of the absorbent pad 200, the exterior sheet 32 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 both front and rear sides, and the end flap portions EF where the absorbent body 23 is not present Is formed. On both sides of the absorbent pad 200, the exterior sheet 32 extends outward from the side edge of the absorber 23. A portion 24x on the outer side in the direction is affixed over the entire front-rear direction and constitutes a side flap portion SF where the absorber 23 does not exist. These pasted portions are shown as dotted patterns in FIG. 1, and can be formed by hot melt adhesive, heat sealing, or ultrasonic sealing. These end flap part EF and side flap part SF comprise the peripheral part of this invention, and the part enclosed by these makes | forms the main-body part of this invention. When the exterior sheet 32 is not provided, the liquid-impervious backsheet 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 the material for the barrier sheet 24, a plastic sheet or a melt-blown nonwoven fabric can be used. However, in terms 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 barrier seat 24 extends to the top sheet 22, and an elongated elastic member 24G is stretched along the front-rear direction at the end 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, the barrier sheets 24, 24 are fixed by being bonded to the inner surface of the article (in the illustrated form, the surface of the top sheet 22 and the outer surface of the exterior sheet 32) across the entire front and rear direction, and the width direction center side. Portion 24c is bonded and fixed to the inner surface of the article (the surface of the top sheet 22 in the illustrated embodiment) at both ends in the front and rear direction, and is 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 and rear direction. It has not been. As shown in FIG. 1, this 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 embodiment), and the standing base end 24 b has a width in the barrier sheet 24. It is located at the boundary between the fixed portion 24x on the outer side in the direction 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. 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 wider than the rear portion, a rectangular shape, or a trapezoidal shape.

  On the other hand, the absorbent body 23 has an upper layer absorbent body 23U having a width L2 narrower than the width L of the lower layer absorbent body 23B and extending in the front-rear direction at least from the crotch portion C2 to the rear side portion B2 on the lower layer absorbent body 23B. Has a two-layer structure in which are stacked. Further, the lower layer absorber 23B and the upper layer absorber 23U are arranged so as to be in direct contact with each other, and when mixing the superabsorbent polymer particles, the lower layer absorber 23B and the upper layer absorber 23U are arranged. It is structured to be integrally wrapped with a core wrap 26 formed of crepe paper or nonwoven fabric. In this embodiment, the core wrap 26 includes an upper core wrap 26A that covers the upper side of the upper layer absorbent body 23U and a lower core wrap 26B that wraps the lower side of the lower layer absorbent body 23B, as shown in FIG. However, in the portion corresponding to the ZZ cross section of FIG. 1, both sides of the core wrap 26 are cut as shown in FIG.

  Here, as a nonwoven fabric, it is possible to make the fiber which consists of thermoplastic polymer materials, such as polyolefin, such as polyethylene and a polypropylene, polyesters, such as a polyethylene terephthalate, polyamides, such as nylon (trademark), as a constituent fiber. These fibers may be a core-sheath type or a side-by-side type composite fiber.

  As described above, in the embodiment, the intermediate sheet 25 that is a mesh film having liquid permeability described above is disposed on the upper side of the upper layer absorbent body 23U via the core wrap 26, and the upper surface of the upper layer slit 40 described later is disposed on the intermediate sheet. 25 is covered. Further, the length M4 in the front-rear direction of the upper layer absorber 23U may be the same as the length M3 in the front-rear direction of the lower layer absorber 23B, but is preferably about 70 to 85%. Further, it is desirable that the total width L2 of the upper layer absorbent body 23U is about 40 to 60% of the total width L of the lower layer absorbent body 23B.

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 More specifically, the fiber basis weight of the lower layer absorbent body 23B can be, for example, about 80 to 400 g / m ² , and the basis weight of the superabsorbent polymer can be, for example, about 50 to 400 g / m ^2. Can be about 80 to 300 g / m ² , and the basis weight of the superabsorbent polymer can be about 10 to ²⁰⁰ g / m ^2, for example.

  The lower layer absorbent body 23B and the upper layer absorbent body 23U may contain pulp as described above in addition to the superabsorbent polymer. When the pulp is contained, the pulp / polymer ratio of the lower layer absorbent body 23B is as follows. In order to enhance the absorption effect, it is considered to be 3 or less, and the ratio of the pulp / polymer of the upper absorbent body 23U is 1.5 or more in order to prevent absorber breakage due to weight of urination In particular, 1.9 is optimal.

  In the lower layer absorbent body 23B, a predetermined portion in the middle in the front-rear direction including the crotch portion C2 is formed as a narrow constricted portion 23n. The minimum width L3 of the constricted portion 23n is preferably about 50 to 65% of the width L1 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 L3 (minimum width portion) is preferably in the range of 25 to 30%. Further, the lower layer absorber 23B does not have a slit at least at a position overlapping with the upper layer slit 40 described below, and may have a slit other than this portion, but it is desirable not to have a slit throughout. .

  In the upper layer absorbent body 23U, upper layer slits 40 penetrating the front and back surfaces are extended from the crotch part C2 to the rear side part B2 on both the left and right sides of the center line in the width direction. 23B of the constricted portion 23n extends to the rear side from the rear widening start position (minimum width portion) 23w toward the rear side, and further to the outer side in the width direction toward the rear side. The diffusion promoting part 41 is provided. The diffusion promoting portion 41 preferably has a curved shape such as an arc along the constricted portion 23n of the lower layer absorber 23B as in the illustrated example, but may be linear. Moreover, although the upper layer absorber 23U of the illustrated form has a rectangular shape, it may have a constricted portion in the middle part in the front-rear direction (not shown) as in the case of the lower layer absorber.

  With such a structure, the upper layer slit 40 is secured as a urine diffusion path even when a compressive force in the thickness direction is applied as in the sitting position, and as shown by an arrow in FIG. Furthermore, in the process of urine locally reaching the absorber 23 at the excretion position of the crotch portion C2 (the black star mark in the figure) diffusing to the rear side along the upper layer slit 40, the diffusion promoting portion of the upper layer slit 40 It diffuses also to the width direction outer side along 41, and is diffused and supplied to the wider lower layer absorber 23B in the width direction. Therefore, since urine is absorbed by the upper layer absorbent body 23U and the lower layer absorbent body 23B, reversal hardly occurs in combination with the provision of the intermediate sheet 25 that is a mesh film. Further, since the upper layer slit 40 exists up to the crotch portion C2, the fit between the crotch portion C2 of the article and the body is good.

From this point of view, the front end of the diffusion promoting portion 41 of the upper layer slit 40 is located on the width direction line passing through the rear side widening starting position 23w in the constricted portion 23n of the lower layer absorber 23B or in the vicinity thereof. preferable. Further, the angle formed between the tangent of the outer edge in the width direction of the diffusion promoting portion 41 of the upper layer slit 40 and the front-rear direction is θ1, and the angle formed between the tangent of the side edge of the constricted portion 23n of the lower layer absorber 23B and the front-rear direction is θ2. In each longitudinal position within the longitudinal range corresponding to the diffusion promoting portion 41 of the upper layer slit 40, the following relational expression:
0 ° ≦ θ1 ≦ 90 °
θ1-20 ° ≦ θ2 ≦ θ1 + 20 °
Is preferably configured to satisfy
In particular, the relation
0 ° ≦ θ1 ≦ 40 °
θ1-10 ° ≦ θ2 ≦ θ1 + 5 °
It is preferable to be configured to satisfy

  Furthermore, it is preferable that the rear end of the diffusion promoting portion 41 of the upper layer slit 40 is separated from the side edge of the lower layer absorber 23B. In this case, the width direction separation distance L1 is configured to satisfy the relationship of 10 mm ≦ L1 ≦ L / 3, where L is the width of the rear end of the constricted portion 23n in the lower layer absorber 23B. It is particularly preferable that the lens is configured to satisfy the relationship of 50 mm ≦ L1 ≦ L / 3. In this way, the rear end of the diffusion promoting portion 41 of the upper layer slit 40 is sufficiently separated from the side edge of the lower layer absorber 23B while being sufficiently extended to the side of the lower layer absorber 23B. As long as the diffusion in the direction is not excessive, urine can be diffused over a sufficiently wide range with respect to the lower layer absorber 23B.

  Further, the total length of the absorbent article is M, the length in the front-rear direction B2 of the rear portion B2 is M1 from the rear end of the diffusion promoting portion of the upper layer slit 40, and the front side of the rear end of the diffusion promoting portion 41 of the upper layer slit 40 is M1. When the length in the front-rear direction of the portion is M2, it is preferable that the relationship of M / 2 ≦ M2 <M is satisfied. In particular, the relationship of M / 7 ≦ M2 <M / 3 is satisfied. It is preferable that it is comprised. In this way, while the rear end of the diffusion promoting portion 41 of the upper layer slit 40 is sufficiently extended to the rear side, the rearward diffusion by the upper layer slit 40 is moderate by being sufficiently separated from the rear end of the article. Become. If the upper layer slit 40 is extended to the rear side of the article too much, the diffusion to the rear side becomes excessive, and so-called back leakage may occur.

  As described above, according to the present embodiment, the intermediate sheet 25 to be a mesh film having liquid permeability is disposed on the upper side of the upper layer absorbent body 23U, and the upper surface of the upper layer slit 40 is covered with the mesh film, The structure which provided the slit only in the upper layer absorber 23U in the upper layer absorber 23U and the lower layer absorber 23B is adopted. As a result, a diffusion path of urine is secured by the upper layer slit 40, and urine that locally reaches the absorber in the crotch portion C2 diffuses to the rear side along the upper layer slit 40, and in the process of this diffusion, the upper layer slit The urine diffuses to the outside in the width direction along the 40 diffusion promoting portions 41.

  On the other hand, in this embodiment, since the slit is provided only in the upper absorber 23U and the slit is not provided in the lower absorber 23B, the strength of the absorber as a whole is ensured, and the absorber 23 collapses most. The urine is positively absorbed in the rear portion from the crotch portion C2 other than the easy crotch portion C2. As a result, it is possible to prevent absorber breakage due to weight of urination.

  Further, the core wrap 26 integrally wraps the lower layer absorber 23B and the upper layer absorber 23U in such a manner that the lower layer absorber 23B and the upper layer absorber 23U are in direct contact with each other, thereby preventing the absorber from being broken due to the weight of urination. The effect becomes even higher.

  In this embodiment, upper layer absorber 23U is formed with a pulp and a polymer, and the ratio of pulp / polymer in upper layer absorber 23U is 1.5 or more. Thus, as the ratio of the polymer to the pulp decreases, as a result that the upper layer absorbent body 23U hardly absorbs urine, the portion of the lower layer absorbent body 23B other than the crotch portion C2 where the absorbent body 23 is most likely to collapse. It is also possible to positively absorb urine and prevent the absorber 23 from collapsing more reliably.

  The width w of the upper layer slit 40 can be determined as appropriate, but in the usual case, it is preferably in the range of 10 to 30 mm, and particularly preferably in the range of 10 to 15 mm. If the width w of the upper layer slit 40 is too narrow, the slit is liable to be crushed in the width direction. If it is too narrow, the upper and lower members (for example, the packaging sheet of the absorber 23) enter the slit 40, and the space for diffusion is reduced anyway. Therefore, it is not preferable.

  On the other hand, the upper layer slit 40 preferably has an introduction portion 42 having a left-right slit interval d of 20 to 40 mm as a portion continuous to the front side of the diffusion promoting portion 41. A more preferable distance d is 10 to 40 mm. The distance M5 from the front end of the introduction portion 42 to the front end of the article is about 1/3 of the total length of the article (for example, if the total article length M is 630 mm, the distance M5 is 250 mm). By disposing the upper layer slit 40 at the rear side position, the structure in which only a part of the absorber 23 does not absorb urine can prevent the collapse of the absorber more reliably.

  Apart from the above, as a modification of the present embodiment, the core wrap 26 may be constituted by a bag-shaped core wrap 26C integrally formed in a bag shape shown in FIG. In the above-described embodiment, the upper layer absorber 23U and the lower layer absorber 23B constituting the absorber 23 are not bonded to each other, but may be configured to be bonded to each other. Moreover, the upper layer absorber 23U and the lower layer absorber 23B may be stacked.

  Furthermore, unlike the above-described embodiment, the upper-layer absorber 23U may be formed only from pulp. In this manner, by forming the upper layer absorbent body 23U only with pulp, it becomes more difficult to absorb urine with the upper layer absorbent body 23U as the polymer is not present in the upper layer absorbent body 23U. As a result, even when the upper layer absorbent body 23U is formed only from pulp, the urine is actively absorbed by the portion of the lower layer absorbent body 23B other than the crotch portion C2 where the absorbent body 23 is most likely to collapse, as in the above embodiment. As a result, the absorber 23 can be reliably prevented from collapsing.

  On the other hand, in order to improve the fit to the crotch portion C2, a slender rubber thread or the like extends from the front portion F2 to the rear portion B2 on the back surface side of the absorbent body 23 on both sides in the width direction of the absorbent pad 200. Although an elastic member can be provided, the presence of the upper layer slit 40 enhances the fit to the crotch portion C2, so that it can be omitted as shown.

  INDUSTRIAL APPLICATION This invention can be utilized for absorbent articles in general, such as an absorption pad, a pants-type or a tape-type disposable diaper, or a napkin for arrangement.

  DESCRIPTION OF SYMBOLS 21 ... Impervious back sheet, 22 ... Liquid permeable top sheet, 23U ... Upper layer absorber, 23B ... Lower layer absorber, 24 ... Barrier sheet, 26 ... Core wrap, 32 ... Exterior sheet, 40 ... Upper layer slit, 200 ... Absorption pad.

Claims (4)

It has a front part and a rear part extending to the front side and the rear side of the crotch part,
A lower layer absorber extending in the front-rear direction from at least the crotch portion to the rear side portion is provided, and on the lower layer absorber, the width is narrower than that of the lower layer absorber and at least from the crotch portion to the rear side portion in the front-rear direction. In an absorbent article provided with an extended upper layer absorbent body,
The lower layer absorbent body is formed as a narrow constricted portion with a predetermined portion in the middle in the front-rear direction including the crotch portion,
Upper and lower slits penetrating the front and back surfaces of the upper-layer absorbent body on both the left and right sides of the center line in the width direction of the upper-layer absorbent body are respectively extended from the rear side portion to the rear side portion from the urination port portion in the crotch portion , and urinating It does not extend to the mouth and its front side ,
The upper layer slit extends so as to be positioned more outward in the width direction toward the rear side at the rear side than the rear side widening start position at which the width starts to increase toward the rear side of the constricted portion of the lower layer absorber. An existing diffusion promoting portion and an introduction portion continuous to the front side of the diffusion promoting portion;
A mesh film having liquid permeability is disposed on the upper side of the upper layer absorber, the upper surface of the upper layer slit from the introduction part to the diffusion promoting part is covered with the mesh film, and both side edges of the mesh film are Located on the center side in the width direction from both side edges of the upper layer absorbent body,
The lower layer absorber does not have a slit at a position overlapping with at least the upper layer slit,
An absorbent article characterized by the above.   The upper-layer absorber is laminated on the lower-layer absorber so that the lower-layer absorber and the upper-layer absorber are in direct contact, and a core wrap integrally wraps the lower-layer absorber and the upper-layer absorber. The absorbent article according to claim 1.   The absorbent article according to claim 1, wherein the upper layer absorbent is formed of pulp and polymer, and the ratio of pulp / polymer in the upper layer absorbent is 1.5 or more.   The absorbent article according to claim 1, wherein the upper layer absorbent body is formed only of pulp.

Images