WO2016114209A1 - Absorbent article - Google Patents

Abstract

The present invention addresses the problem of increasing the absorbent capacity, liquid diffusibility, and collecting capacity of an absorbent article having a multilayered absorber. This absorbent article is provided with a liquid-permeable top sheet (10) located on the skin-facing-surface side, a liquid-impermeable back sheet (20) located on the non-skin-facing-surface side, and a plurality of absorbers stacked in the direction of thickness between the top sheet (10) and the back sheet (20). The plurality of absorbers includes at least an upper-layer absorber (30) located on the top-sheet (10) side and a lower-layer absorber (40) located on the back-sheet (20) side. The upper-layer absorber (30) has an upper opening (31) having a prescribed length and width, the upper opening (31) extending in the longitudinal direction, and the lower-layer absorber (40) has a lower opening (41) having a shorter length and width than the upper opening (31), the lower opening (41) extending in the longitudinal direction. The upper opening (31) and lower opening (41) at least partially overlap in the direction of thickness.

Description

Absorbent articles

The present invention relates to an absorbent article that is attached to the inseam of a wearer and absorbs and holds a liquid such as urine.

Conventionally, an absorbent article to be worn on the wearer's inseam is known for the purpose of absorbing and holding excreted body fluid. Examples of absorbent articles are disposable diapers, absorbent pads, and sanitary napkins. In addition, as disposable diapers, for example, a pants type in which the left and right sides of the front body and the back body are joined, or a tape type that is worn with a fastening tape attached to the back body attached to the front body It has been known.

Further, in general absorbent articles, an absorbent body composed of absorbent fibers and a super absorbent polymer (SAP) is provided between a liquid-permeable top sheet and a liquid-impermeable back sheet. ing. Such an absorbent article has a structure in which the skin-facing surface of the absorber is covered with a top sheet, and the skin-non-facing surface of the absorber is covered with a back sheet. For this reason, liquids such as urine excreted by the wearer permeate the top sheet and are absorbed and held by the absorber. Further, the liquid held in the absorber is prevented from leaking outside by a liquid-impermeable back sheet disposed on the back side of the absorber.

By the way, the technique which forms the opening part (slit) penetrated to the thickness direction in the absorber which comprises an absorbent article conventionally is known (patent document 1, patent document 2, patent document 3). Such slits increase the liquid diffusibility, improve the fit of the wearer's body, prevent stool and other solid matter from touching the wearer's skin for a long time, and flex the absorber. It is formed in the absorbent body for various purposes such as facilitating it.

For example, Patent Document 1 discloses a technique for forming a Y-shaped opening for a single-layer absorber. Patent Documents 2 and 3 disclose a technique in which a plurality of absorbers are stacked in the thickness direction and an opening is formed in each absorber. In particular, in the absorbent article of Patent Document 2, an upper through hole is formed in the upper absorbent body, a lower through hole is formed in the lower absorbent body, and the upper through hole and the lower through hole are arranged in a non-overlapping manner. It is said. Further, the absorbent article of Patent Document 3 is provided with a first layer located on the skin facing surface side and a second layer located on the skin non-facing surface side, and side slits are formed on the left and right sides of the first layer. In the second layer, a central opening located in the center and side slits located on both the left and right sides are formed. Here, the side slits of the first layer and the side slits of the second layer have substantially the same length and the same width, and are provided so as to overlap each other.

JP 2012-090818 A JP 2010-200968 A JP 2014-014726 A

As shown in Patent Document 1 to Patent Document 3, by forming an opening (slit) in the absorber, the surface area of the absorber that comes into contact with a liquid such as urine is increased. improves. In addition, since the liquid diffuses along the opening of the absorber, it is possible to improve the liquid diffusibility of the absorber by providing the opening in the absorber. Moreover, like the absorbent article of patent document 2 and patent document 3, the excreted liquid is absorbed by the upper layer by stacking the absorber in two or more layers and providing an opening in the upper layer absorber. It is led to the lower absorber through the body opening. As a result, it is considered that the absorption capacity of both the upper absorber and the lower absorber can be utilized. Therefore, it can be said that laminating a plurality of absorbers with openings formed is preferable from the viewpoint of enhancing the liquid absorption capacity and liquid diffusibility.

However, in the absorbent article of Patent Document 2, the through hole of the upper layer absorber and the through hole of the lower layer absorber are arranged in a non-overlapping manner, and the liquid excreted by the wearer passes through the through hole of the upper layer absorber. Even so, it is not configured to flow into the through hole of the lower layer absorber. For this reason, as for the absorbent article of patent document 2, the through-hole of the lower layer absorber did not contribute to the improvement of the liquid absorbency and the liquid diffusibility.

Also, the absorbent article of Patent Document 3 is provided with the side slits of the first layer and the second side slits of the absorber being overlapped. For this reason, in the absorbent article of patent document 3, the liquid excreted by the wearer may pass through the side slit of the first layer and further reach the side slit of the second layer. The improvement of power is expected. However, a general absorbent article is worn on the crotch so as to be sandwiched between the legs of the wearer, and is compressed in the width direction when worn on the wearer's crotch. It becomes. In this case, as in the absorbent article of Patent Document 3, when the opening of the upper absorbent body and the opening of the lower absorbent body are formed with substantially the same length and width, the absorbent article is mounted on the inseam of the wearer. Occasionally, both the upper layer and the lower layer opening may be crushed simultaneously under compression in the width direction. Thus, if the space for forming the opening is crushed, it will be difficult for the liquid to flow from the opening of the upper absorber to the lower absorber, and the absorption capacity of the lower absorber will be fully utilized. There is a problem that can not be. Further, if the opening of the upper absorber is crushed, it becomes difficult for the liquid to diffuse along the opening, so that there is a problem that the liquid diffusibility of the entire absorber is lowered.

Furthermore, as in the absorbent article of Patent Document 3, if the upper and lower openings are formed with substantially the same length and width, the liquid flowing into the upper opening is trapped by the lower absorber. Instead of gathering, it may pass through the lower opening as it is to reach the back sheet. In such a case, there was a problem that the liquid excreted by the wearer could not be efficiently collected by the lower absorber.

Therefore, at present, there is a technique for efficiently utilizing the absorption capacity, liquid diffusibility, and collection capacity of each layer of the absorber in an absorbent article having a plurality of layers of absorbers with openings. It has been demanded.

The inventors of the present invention have made extensive studies on the means for solving the conventional problems, and as a result, in an absorbent article having a plurality of layers of absorbers in which openings are formed, the openings of the upper layer absorber are the openings of the lower layer absorber. The upper and lower openings are arranged in a superposed manner. In this way, the relatively large upper layer openings and the relatively small lower layer openings are at least partially overlapped to efficiently improve the absorption capacity, liquid diffusibility, and collection capacity of the absorber in each layer. We obtained the knowledge that it can be utilized for. Then, the present inventors have conceived that the problems of the prior art can be solved based on the above knowledge, and have completed the present invention. More specifically, the present invention has the following configuration.

The present invention relates to absorbent articles such as disposable diapers and absorbent pads.
The absorbent article of the present invention has a crotch portion 3 positioned between a front body 1 located on the wearer's abdomen and a back body 2 located on the back of the wearer when worn.
The absorbent article of the present invention includes a liquid-permeable top sheet 10 located on the skin facing surface side, a liquid-impermeable back sheet 20 located on the skin non-facing surface side, and the top sheet 10 and the back sheet. A plurality of absorbers interposed between 20 and stacked in the thickness direction.
Here, the plurality of absorbers include at least an upper layer absorber 30 located on the top sheet 10 side and a lower layer absorber 40 located on the back sheet 20 side.
The upper layer absorber 30 has an upper opening 31 that extends in the longitudinal direction and has a predetermined length and width. The lower layer absorber 40 has a lower opening 41 that extends in the longitudinal direction and has a shorter length and width than the upper opening 31.
And the upper side opening part 31 and the lower side opening part 41 have overlapped at least partially in the thickness direction.

Like the above configuration, the upper opening 31 of the upper layer absorber 30 and the lower opening 41 of the lower layer absorber 40 are overlapped so that the liquid excreted by the wearer passes through the upper opening 31 and the lower opening 41. Therefore, the liquid can be absorbed in a wide range of each absorber. Further, by forming the upper opening 31 larger than the lower opening 41, when the absorbent article is mounted, the upper layer absorber 30 and the lower layer absorber 40 are compressed in the width direction so that the lower opening 41 is formed. Even when it is blocked, the upper opening 31 can be widened. Thereby, even in a state where the absorbent article is mounted, liquid such as urine can be guided to the lower layer absorber 40 through the upper opening 31, so that the absorbent capacity of the absorbent article can be improved. it can. Moreover, since liquids, such as urine, are diffused along the upper side opening part 31 of the upper layer absorber 30, and the lower side opening part 41 of the lower layer absorber 40, the liquid diffusibility of the whole absorbent article can be improved. Furthermore, by making the lower opening 41 of the lower layer absorber 40 smaller than the upper opening 31 of the upper layer absorber 30, the liquid that has passed through the upper opening 31 is easily collected by the lower layer absorber 40. Become. That is, the possibility that the excreted liquid passes through both the upper opening 31 and the lower opening 41 and reaches the back sheet 20 without being collected by the absorber can be suppressed. Therefore, according to the above configuration, it is possible to improve the absorption capability, liquid diffusibility, and collection capability of the absorbent article.

In the absorbent article of the present invention, a liquid diffusive sheet is preferably disposed between the upper layer absorber 30 and the lower layer absorber 40. In particular, the liquid diffusive sheet is preferably located between the upper opening 31 of the upper absorber 30 and the lower opening 41 of the lower absorber 40. Moreover, it is preferable that no opening is formed in the liquid diffusive sheet between the upper opening 31 and the lower opening 41.

As in the above configuration, by disposing a liquid diffusive sheet between the absorbers 30 and 40 in which the openings 31 and 41 are formed, the liquid absorbed by the upper absorber 30 and the upper openings 31 are arranged. The liquid that has passed through is diffused over a wide area by the liquid diffusive sheet. Thereby, it becomes possible to utilize efficiently the absorption capability which the upper layer absorber 30 and the lower layer absorber 40 have.

The absorbent article of the present invention preferably further includes an SAP layer 50. The SAP layer 50 is a layer formed by arranging a plurality of superabsorbent polymers (SAP) between the upper layer absorber 30 and the lower layer absorber 40.
In this case, the SAP layer 50 is preferably formed at least on both the left and right sides in the width direction of the lower opening 41.

As described above, by providing the SAP layer 50 between the upper layer absorber 30 and the lower layer absorber 40, the liquid diffused by the liquid diffusive sheet can be quickly absorbed. Further, by disposing the SAP layer 50 between the upper layer absorber 30 and the lower layer absorber 40, even if the liquid is absorbed and the volume expands, the feeling is hardly transmitted to the wearer.

In the absorbent article of the present invention, the SAP layer 50 is preferably formed on the left and right sides in the width direction of the lower opening 41 and in a region that does not overlap the upper opening 31 in the thickness direction.

As described above, the SAP layer 50 is disposed at a position that does not overlap the upper opening 31 of the upper absorber 30, so that the SAP layer 50 is sandwiched and fixed between the upper absorber 30 and the lower absorber 40. Can do. For this reason, even if the wearer of the absorbent article moves, the superabsorbent polymer constituting the SAP layer 50 can be prevented from entering the upper opening 31 and the lower opening 41. That is, if the highly water-absorbing polymer enters the openings 31 and 41, when the polymer absorbs the liquid, the openings 31 and 41 are blocked, and the liquid diffusibility of the absorbers 30 and 40 may be impaired. is there. Moreover, since the fiber material etc. which comprise the absorbers 30 and 40 are not arrange | positioned in these opening parts 31 and 41, if a highly water-absorbing polymer enters into the opening parts 31 and 41, the roughness of a highly water-absorbing polymer will be rough. The touch is transmitted to the wearer, and the touch is not good. Therefore, in order to prevent the superabsorbent polymer from falling into the openings 31 and 41, it is preferable to dispose the SAP layer 50 at a position that does not overlap with the upper opening 31 of the upper absorbent body 30.

In the absorbent article of the present invention, it is preferable that both or one of the upper layer absorber 30 and the lower layer absorber 40 has a low density region 71 and a high density region 72. The low density region 71 is a region where the density of the fibers constituting the absorber is relatively low on both the left and right sides of the upper opening 31 or the lower opening 41 in the width direction. The high density region 72 is a region where the density of the fibers constituting the absorber is relatively high on the left and right outer sides in the width direction of the low density region 71.

As described above, by forming the high-density region 72 outside the width direction of the upper layer absorber 30 and the lower layer absorber 40, the shape retention of the absorbers 30 and 40 is improved. For this reason, even if the upper layer absorber 30 and the lower layer absorber 40 are stacked, the absorbers 30 and 40 can be less likely to be displaced. In addition, when worn, the absorbent body is compressed by being sandwiched between the legs of the wearer and is moved further in the front-rear direction. However, by making the absorbent body highly retainable, the phenomenon that the mat breaks is less likely to occur. Can do. However, if the fiber density of the absorbers 30 and 40 as a whole is increased, the absorption capacity and liquid diffusibility of the absorbers 30 and 40 may be reduced. Therefore, in a preferred embodiment of the present invention, the fiber density of the upper layer absorber 30 and the lower layer absorber 40 is lowered near the center in the width direction where the upper opening 31 and the lower opening 41 are formed, and the absorption capacity and Maintains liquid diffusibility. Thereby, the absorption performance and shape retention property of the upper layer absorber 30 and the lower layer absorber 40 can be made compatible.

According to the present invention, in an absorbent article having a plurality of layers of absorbers in which openings are formed, the absorption capacity, liquid diffusibility, and collection capacity of the absorbers of each layer can be efficiently utilized.

FIG. 1 is a plan view showing an absorbent article according to the first embodiment of the first invention. 2 is a cross-sectional view taken along line X1-X1 shown in FIG. FIG. 3 is a plan view showing an absorbent article according to the second embodiment of the first invention. 4 is a cross-sectional view taken along line X2-X2 shown in FIG. FIG. 5 is a cross-sectional view of an absorbent article according to the third embodiment of the first invention. FIG. 6 is a plan view showing the absorbent article according to the first embodiment of the second invention. FIG. 7 is a cross-sectional view taken along line X3-X3 shown in FIG. FIG. 8 is a plan view showing an absorbent article according to the second embodiment of the second invention. FIG. 9 is a plan view showing an absorbent article according to the third embodiment of the second invention. 10 is a cross-sectional view taken along line X4-X4 shown in FIG.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. This invention is not limited to the form demonstrated below, The thing suitably changed in the range obvious to those skilled in the art from the following forms is also included.

In this specification, “A to B” means “A to B”.
Further, in the present specification, the “longitudinal direction” means a direction in the absorbent article that connects the front body located on the wearer's abdomen side and the back body located on the wearer's back side. The “width direction” means a direction perpendicular to the longitudinal direction of the absorbent article. In the drawings of the present application, the longitudinal direction of the absorbent article is indicated by the Y axis, and the width direction of the absorbent article is indicated by the X axis.
Moreover, in this-application specification, a "skin opposing surface" means the surface which opposes a wearer's skin at the time of wear of an absorbent article. The “non-skin facing surface” means a surface that does not face the wearer's skin when the absorbent article is worn.

[1. About the first invention]
[1-1. First Embodiment]
First, with reference to FIG.1 and FIG.2, 1st Embodiment of the absorbent article 100 which concerns on 1st invention is described. FIG. 1 is a plan view showing an absorbent article 100 according to the first embodiment. 2 is a cross-sectional view schematically showing a cross-sectional structure of the absorbent article 100 taken along the line X1-X1 shown in FIG. In the cross-sectional view of FIG. 2, in order to show the configuration of the absorbent article 100 in an easy-to-understand manner, gaps are drawn between various components, but in reality, there are no gaps between the components. Little formed.

The absorbent article 100 according to the present embodiment relates to an absorbent pad. The absorbent pad can be used alone, or can be used on the inner surface side of a pants-type or tape-type disposable diaper. As shown in FIG. 1, the absorbent article 100 includes a front body 1 located on the wearer's abdomen side, a back body 2 located on the wearer's back side, and a crotch 3 located therebetween. And can be divided in the longitudinal direction. Specifically, the absorbent article 100 has a shape that can be expressed as a gourd type or an hourglass type in a plan view. In other words, the absorbent article 100 has a constricted portion at the crotch 3 which is a portion where the lateral width of the absorbent article 100 is the narrowest. On the other hand, the front body 1 and the back body 2 of the absorbent article 100 have side flaps that are portions extending from the constricted portion of the crotch 3 to the left and right outer sides in the width direction. That is, in the portion where the side flaps are formed, the width of the front body 1 and the back body 2 is wider than the width of the constricted portion of the crotch 3. Thus, the absorbent article 100 can be a gourd type (hourglass type). However, the shape of the absorbent article 100 can be changed as appropriate, for example, a simple rectangular shape.

As shown in FIGS. 1 and 2, the absorbent article 100 basically includes a liquid-permeable top sheet 10, a liquid-impermeable back sheet 20, and a plurality of them interposed therebetween. Absorbers 30 and 40 are provided. As shown in the sectional view of FIG. 2, the plurality of absorbers 30 and 40 are stacked in the thickness direction. The top sheet 10 covers the skin facing surface side of the laminated absorbent bodies 30 and 40, and the back sheet 20 covers the skin non-facing surface side of the laminated absorbent bodies 30 and 40. . As shown in FIGS. 1 and 2, the top sheet 10 and the back sheet 20 are joined to each other around the absorbers 30 and 40. As a result, the absorbers 30 and 40 are surrounded by the joint between the top sheet 10 and the back sheet 20.

The top sheet 10 is a sheet-like member that is in direct contact with the skin of the wearer's inseam and allows liquid such as urine to pass through the absorbers 30 and 40. For this reason, the top sheet 10 is composed of a liquid-permeable material having high flexibility. Examples of the liquid permeable material constituting the top sheet 10 are a woven fabric, a non-woven fabric, or a porous film. Further, for example, a fiber made of a thermoplastic resin such as polypropylene, polyethylene, polyester, or nylon, which has been subjected to a hydrophilization treatment and further made into a non-woven fabric may be used. Examples of the nonwoven fabric include air-through nonwoven fabric, point bond nonwoven fabric, spunbond nonwoven fabric, and melt blown nonwoven fabric.

The back sheet 20 is a sheet-like member for preventing liquid that has passed through the top sheet 10 and absorbed by the absorbers 30 and 40 from leaking out of the diaper. For this reason, the backsheet 20 is comprised with a liquid-impermeable material. An example of the liquid-impermeable material constituting the backsheet 20 is a liquid-impermeable film made of polyethylene resin. In particular, the backsheet 20 is preferably a microporous polyethylene film in which a plurality of fine pores of 0.1 to 4 μm are formed in order to ensure air permeability while maintaining liquid impermeability.

The absorbers 30 and 40 are members for absorbing a liquid such as urine and holding the absorbed liquid. The absorbers 30 and 40 are disposed between the liquid-permeable top sheet 10 and the liquid-impermeable back sheet 20. The absorbent article 100 according to this embodiment includes two absorbers, an upper layer absorber 30 located on the top sheet 10 side and a lower layer absorber 40 located on the back sheet 20 side. Each of the upper layer absorber 30 and the lower layer absorber 40 can be made of a known absorbent material. As an absorptive material, it is good also as using the fluff pulp formed by crushing fiber materials, such as a conifer, a super absorbent polymer (SAP), and a hydrophilic sheet, for example. In addition, as the absorbent material, one kind of fluff pulp, super absorbent polymer, or hydrophilic sheet may be used alone, or two or more kinds may be used in combination.

In the present embodiment, the upper layer absorbent body 30 is a combination of fluff pulp and a superabsorbent polymer, and has a configuration in which a plurality of granular superabsorbent polymers are supported by the fluff pulp. On the other hand, the lower layer absorber 40 consists only of fluff pulp, and the superabsorbent polymer is not distributed. Thus, among the plurality of absorbent bodies, at least the upper absorbent body 30 located near the skin of the wearer is made to contain the superabsorbent polymer, and the lower absorbent body 40 not containing this superabsorbent polymer is provided. This is a preferred embodiment of the present invention. Since the upper absorbent body 30 contains a superabsorbent polymer, liquid such as urine can be quickly absorbed by the upper absorbent body 30, so that the surface of the absorbent article 100 is smooth and uncomfortable for the wearer. Can be avoided. On the other hand, the lower layer absorber 40 absorbs liquid that could not be absorbed by the upper layer absorber 30. At this time, rather than providing a superabsorbent polymer in the lower layer absorber 40 to increase the absorption rate, the amount of liquid absorbed is more likely to absorb the liquid in a wide range of the lower layer absorber 40 without providing the superabsorbent polymer. It is effective in terms of improving For this reason, in the present embodiment, the superabsorbent polymer is sprayed only on the upper layer absorber 30 and the superabsorbent polymer is not sprinkled on the lower layer absorber 40.

As shown in FIGS. 1 and 2, in the present invention, an upper opening 31 is formed in the upper absorber 30. The upper opening 31 is a hole (slit) penetrating in the thickness direction of the upper absorber 30. The upper opening 31 is formed at least in a portion of the upper-layer absorber 30 that is easy to directly touch the urine excreted by the wearer at first. Specifically, as shown in FIG. 1, the upper opening 31 is formed in the crotch 3. For example, the upper opening 31 may be formed in a part of the crotch part 3 and extends to the front body 1 and / or the back body 2 beyond the crotch part 3. It may be formed as follows. Moreover, it is preferable that the upper side opening part 31 is located in the center part of the width direction of the crotch part 3. For example, when the crotch part 3 is equally divided into three regions of the left part, the central part, and the right part in the width direction, the upper opening 31 is positioned at the central part of the crotch part 3. Is preferred.

As described above, by forming the upper opening 31 in the crotch 3 of the upper layer absorber 30, the urine excreted by the wearer diffuses in the longitudinal direction along the upper opening 31. Moreover, since the surface area of the upper layer absorber 30 is increased by forming the upper opening 31, a liquid such as urine can be quickly absorbed. Furthermore, liquid such as urine excreted on the upper layer absorber 30 can be guided to the lower layer absorber 40 through the upper opening 31. Thereby, the liquid can be efficiently absorbed by both the upper layer absorber 30 and the lower layer absorber 40.

As shown in FIGS. 1 and 2, the upper opening 31 has a predetermined length L1 (maximum value) and a predetermined lateral width W1 (maximum value). The length L1 and the lateral width W1 of the upper opening 31 may be appropriately adjusted according to the size of the absorbent article 100. For example, when the absorbent article 100 is an absorbent pad for adults, the length L1 of the upper opening 31 may be 100 mm to 300 mm, or 150 mm to 250 mm. Further, the lateral width W1 of the upper opening 31 is at least shorter than the length L1, and may be, for example, 5 mm to 35 mm, or 10 mm to 30 mm. Thus, the upper side opening part 31 becomes a shape long in a longitudinal direction. In the example shown in FIG. 1, the upper opening 31 is formed in a rectangular shape extending in the longitudinal direction. However, the shape of the upper opening 31 is not limited to the illustrated one, and various shapes such as a triangle, a pentagon, other polygons, and a circle can be adopted.

Further, as shown in FIG. 1 and FIG. 2, in the present invention, a lower opening 41 is formed in the lower layer absorber 40. The lower opening 41 is a hole (slit) penetrating in the thickness direction of the lower layer absorber 40. The lower opening 41 has a predetermined length L2 (maximum value) and a predetermined lateral width W2 (maximum value). Here, as shown in the figure, the length L2 and the width W2 of the lower opening 41 of the lower layer absorber 40 are shorter than the length L1 and the width W1 of the upper opening 31 of the upper layer absorber 30, respectively. (L2 <L1, W2 <W1). For example, the length L2 of the lower opening 41 is preferably 40% to 95% or 50% to 90% with respect to the length L1 of the upper opening 31. The lateral width W2 of the lower opening 41 is preferably 30% to 95% or 40% to 90% with respect to the lateral width W1 of the upper opening 31. Thus, since the length and width of the lower opening 41 are shorter than the length and width of the upper opening 31, basically, the opening area of the lower opening 41 is the opening area of the upper opening 31. Smaller than. As shown in FIG. 1, the shape of the lower opening 41 is preferably a rectangular shape similar to the upper opening 31. However, the shape of the lower opening 41 may not be similar to that of the upper opening 31, and various shapes such as a triangle, a pentagon, other polygons, and a circle can be adopted.

Further, the lower opening 41 of the lower layer absorber 40 is formed at a position at least partially overlapping with the upper opening 31 of the upper layer absorber 30. In particular, as shown in FIG. 1, the lower opening 41 preferably overlaps the upper opening 31 as a whole. However, the lower opening 41 may have a portion that does not overlap the upper opening 31. For example, when the entire area of the lower opening 41 is 100%, the lower opening 41 is such that 50% to 100% or 90% to 100% of the area overlaps with the upper opening 31. Preferably there is. Thus, by overlapping a part or all of the lower opening 41 with the upper opening 31, these two openings 31, 41 communicate with each other.

As described above, by allowing the upper opening 31 of the upper layer absorber 30 and the lower opening 41 of the lower layer absorber 40 to communicate with each other, the liquid excreted by the wearer passes through the upper opening 31 and the lower opening 41. Therefore, the liquid can be absorbed in a wide range of the absorbers 30 and 40. Moreover, when the absorbent article 100 is attached to the wearer's crotch, it is considered that the absorbent bodies 30 and 40 are compressed in the width direction. At this time, by forming the upper opening 31 larger than the lower opening 41, each absorber 30, 40 is compressed in the width direction and the lower opening 41 is blocked. In addition, the space of the upper opening 31 can be maintained. Thereby, even when the absorbent article is mounted, liquid such as urine can be guided to the lower layer absorber 40 through the upper opening 31, and the absorbent capacity of the absorbent article can be improved. Moreover, since liquids, such as urine, are diffused along the upper side opening part 31 of the upper layer absorber 30, and the lower side opening part 41 of the lower layer absorber 40, the liquid diffusibility of the whole absorbent article can be improved. Furthermore, by making the lower opening 41 of the lower layer absorber 40 smaller than the upper opening 31 of the upper layer absorber 30, the liquid that has passed through the upper opening 31 can be easily collected by the lower layer absorber 40. Become.

As shown in FIGS. 1 and 2, in the present embodiment, the shapes of the upper layer absorber 30 and the lower layer absorber 40 are different. That is, the upper layer absorber 30 is molded into a so-called gourd type or hourglass type, whereas the lower layer absorber 40 is molded into a rectangular shape. Thus, the shapes of the upper layer absorber 30 and the lower layer absorber 40 can be made different. In particular, the upper layer absorber 30 has an extending portion 32 that extends more outward in the width direction than the lower layer absorber 40 in the front body 1 and the back body 2 when superimposed on the lower layer absorber 40. Yes. Therefore, in the present embodiment, the upper layer absorber 30 is formed larger than the lower layer absorber 40 by the extension portion 32. Thus, by increasing the size of the upper layer absorber 30, when urine or the like is excreted, it can be quickly absorbed in a wide range of the upper layer absorber 30, which leads to prevention of urine leakage. In addition, the lower layer absorber 40 disposed below the upper layer absorber 30 may be formed into a gourd shape like the upper layer absorber 30, but the wearing feeling of the absorbent article 100 may be reduced. , Not very preferable. Therefore, as in the present embodiment, the shape of the lower layer absorbent body 40 is a rectangular shape smaller than that of the upper layer absorbent body 30, thereby increasing the amount of absorption of the entire absorbent article 100 and maintaining a good feeling of wear. can do.

2, the absorbent article 100 according to this embodiment further includes a first diffusion sheet 61, a second diffusion sheet 62, and a third diffusion sheet 63. As shown in FIG. 2, the first diffusion sheet 61 is disposed between the top sheet 10 and the upper layer absorber 30. Further, the second diffusion sheet 62 is disposed between the upper layer absorber 30 and the lower layer absorber 40. The third diffusion sheet 63 is disposed between the lower layer absorber 40 and the back sheet 20. In the present embodiment, the second diffusion sheet 62 and the third diffusion sheet 63 are composed of a single sheet member, and both are integrally connected so as to enclose the lower layer absorber 40. It has become a thing. As described above, each of the diffusion sheets 61 to 63 may be composed of separate sheet members, or may be composed of connected sheet members.

The first diffusion sheet 61, the second diffusion sheet 62, and the third diffusion sheet 63 are sheet-like members having liquid diffusibility capable of absorbing and diffusing liquid. Each of the diffusion sheets 61 to 63 may be a thin paper such as tissue paper or a non-woven fabric. Examples of the nonwoven fabric include air-through nonwoven fabric, point bond nonwoven fabric, spunbond nonwoven fabric, and melt blown nonwoven fabric.

As shown in FIG. 2, the first diffusion sheet 61 covers the upper opening 31 of the upper absorbent body 30 from the skin facing surface side. Further, the second diffusion sheet 62 covers the upper opening 31 of the upper absorbent body 30 from the skin non-facing surface side, and covers the lower opening 41 of the lower absorbent body 40 from the skin facing surface side. Further, the third diffusion sheet 63 covers the lower opening 41 of the lower layer absorber 40 from the skin non-facing surface side. As described above, by covering the absorbers 30 and 40 including the respective openings 31 and 41 with the liquid diffusable sheet member, the liquid flowing into the openings 31 and 41 can be efficiently diffused. it can. Thereby, since a liquid is absorbed in the wide range of the two absorbers 30 and 40, the absorption capability of the two absorbers 30 and 40 can be utilized effectively. In particular, it is difficult for the liquid to penetrate into the gap between the upper layer absorber 30 and the lower layer absorber 40. Therefore, by providing the second diffusion sheet 62 in the gap between the upper layer absorber 30 and the lower layer absorber 40, in the gap region between the upper layer absorber 30 and the lower layer absorber 40, which is normally difficult to absorb liquid. Can also penetrate liquid.

As shown in the cross-sectional view of FIG. 2, the absorbent article 100 according to this embodiment further includes an SAP layer 50. The SAP layer 50 is formed between the upper layer absorber 30 and the lower layer absorber 40. The SAP layer 50 is a layer formed by collecting a plurality of granular superabsorbent polymers (SAP). The SAP layer 50 is held between the absorbers 30 and 40 by sandwiching a plurality of superabsorbent polymers between the upper absorber 30 and the lower absorber 40. A known material may be used as the superabsorbent polymer (SAP). For example, a highly water-absorbing polymer absorbs liquid about 100 to 1000 times its own weight. As the superabsorbent polymer, for example, a polymer having a diameter of about 0.1 mm to 0.5 mm in a dry state before liquid absorption may be employed.

As described above, by providing the SAP layer 50 between the upper layer absorber 30 and the lower layer absorber 40, the liquid guided between the upper layer absorber 30 and the lower layer absorber 40 by the second diffusion sheet 62 is allowed to flow. , The SAP layer 50 can be absorbed quickly. Accordingly, the liquid that has flowed into the upper opening 31 of the upper absorber 30 can be reliably collected by the SAP layer 50 while being diffused over a wide range by the second diffusion sheet 62. Thereby, even if a large amount of liquid is discharged into the central portion of the upper-layer absorber 30 or the upper opening 31, it is possible to prevent the liquid from leaking to the outside. In addition, since the SAP layer 50 is disposed between the upper layer absorber 30 and the lower layer absorber 40, even if the SAP layer 50 absorbs a large amount of liquid and expands its volume, the feel of the SAP layer 50 is felt to the wearer. Difficult to communicate. Therefore, it is possible to provide the wearer with a good wearing feeling that does not change between before and after liquid excretion.

The SAP layer 50 is formed at least on both the left and right sides in the width direction of the lower opening 41. In particular, the SAP layer 50 is preferably formed on both the left and right sides of the lower opening 41 in the width direction and on the left and right sides of the upper opening 31 in the width direction. Thus, by providing the SAP layer 50 in a range that does not overlap both the upper opening 31 and the lower opening 41, the entire SAP layer 50 can be completely sandwiched between the upper absorber 30 and the lower absorber 40. it can. For this reason, even when the wearer of the absorbent article moves greatly, the superabsorbent polymer constituting the SAP layer 50 drops into the upper opening 31 and the lower opening 41. Can be prevented. If the superabsorbent polymer falls into the openings 31 and 41, the wearer may have a risk of clogging the openings 31 and 41 when the polymer absorbs the liquid, or the rough feel of the superabsorbent polymer. There is a risk of transmission. In this regard, by providing the SAP layer 50 in a range that does not overlap both the upper opening 31 and the lower opening 41, it is possible to more reliably prevent the superabsorbent polymer from dropping into the openings 31 and 41. In addition, although illustration is abbreviate | omitted, the SAP layer 50 may be formed in the front-back both sides of the longitudinal direction of the upper side opening part 31 or the lower side opening part 41. As shown in FIG.

Further, as shown in FIG. 2, the SAP layer 50 is formed between the upper layer absorber 30 and the lower layer absorber 40 and between the second diffusion sheet 62 and the lower layer absorber 40. Is preferred. In particular, in the present embodiment, the lower layer absorber 40 is enclosed in a single sheet member formed by connecting the second diffusion sheet 62 and the third diffusion sheet 63. In such a case, it is preferable to enclose the SAP layer 50 together with the lower layer absorber 40 in one sheet member constituted by the second diffusion sheet 62 and the third diffusion sheet 63. Thereby, even if the superabsorbent polymer constituting the SAP layer 50 is dropped into the lower opening 41 of the lower layer absorber 40, the superabsorbent polymer is scattered around. The situation can be avoided. In addition, by forming the SAP layer 50 below the second diffusion sheet 62, the liquid that has penetrated the second diffusion sheet 62 can easily move to the SAP layer 50, so that the liquid can be more efficiently transferred by the SAP layer 50. It can be absorbed.

Further, as shown in FIG. 2, in the present embodiment, the second diffusion sheet 62 positioned between the upper layer absorber 30 and the lower layer absorber 40 partially overlaps with each other. In this case, it is preferable that the overlapping portion of the second diffusion sheet 62 covers the skin non-facing surface side of the upper opening 31 and the skin facing surface side of the lower opening 41. In this way, the liquid that has flowed into the openings 31 and 41 is obtained by partially overlapping and thickening the second diffusion sheet 62 at the portion where the upper opening 31 and the lower opening 41 are formed. Can be diffused more efficiently.

[1-2. Second Embodiment]
Subsequently, a second embodiment of the absorbent article 100 according to the first invention will be described with reference to FIGS. 3 and 4. In the second embodiment, description of the same configuration as that of the first embodiment described above will be omitted, and description will be made focusing on a configuration different from that of the first embodiment. FIG. 3 shows a plan view of the absorbent article 100 as in FIG. 4 shows a cross-sectional view taken along line X2-X2 shown in FIG. 3, as in FIG. As shown in FIGS. 3 and 4, in the absorbent article 100 according to the second embodiment, the upper layer absorber 30 and the lower layer absorber 40 have a low density region 71 and a high density region 72. This is different from the first embodiment described above.

As shown in FIGS. 3 and 4, a low density region 71 is formed at least in the crotch 3 of the upper layer absorber 30 and the lower layer absorber 40, and a region other than the low density region 71 is a high density region 72. ing. The low density region 71 is a region where the density of the fibers constituting the absorbent bodies 30 and 40 is lower than that of the high density region 72. Further, the high density region 72 is a region where the density of the fibers constituting the absorbent bodies 30 and 40 is higher than that of the low density region 71.

More specifically, in the present embodiment, the low density region 71 is formed in the central portion of each absorber 30, 40 in the width direction. Further, the low density region 71 is formed over the entire longitudinal direction of each of the absorbent bodies 30 and 40 from the crotch 3 to the front body 1 and the back body 2. Thus, the low density region 71 is formed at least in the center in the width direction of the crotch 3. Further, an upper opening 31 is formed in the low density region 71 of the upper absorber 30, and a lower opening 41 is formed in the low density region 71 of the lower absorber 40.

Thus, in a preferred embodiment of the present invention, the low density region 71 is formed in the central portion in the width direction of each absorber 30, 40, and the openings 31, 41 are formed in the low density region 71. Thereby, the liquid such as urine excreted by the wearer can be quickly absorbed in the low density region 71 of each absorber 30, 40. Moreover, since the openings 31 and 41 extending in the longitudinal direction are formed in the low density region 71, the liquid can be diffused throughout the low density region 71.

On the other hand, the area other than the low density area 71 is a high density area 72. In the present embodiment, the high density regions 72 are formed on both the left and right sides of the low density region 71 in the width direction, and are divided into two regions with the low density region 71 interposed therebetween. That is, the left and right high-density regions 72 are formed over the entire longitudinal direction of each absorber 30, 40, respectively. In the present embodiment, the upper opening 31 of the upper absorber 30 and the lower opening 41 of the lower absorber 40 are formed only in the low density region 71 and are not formed in the high density region 72. However, it is also possible to form the openings 31 and 41 over both the low density region 71 and the high density region 72.

The high density region 72 can be formed by pressing the upper layer absorber 30 and the lower layer absorber 40, for example. A press device such as a known press roller can be used for pressing the absorbers 30 and 40. Thus, since the thickness of each absorber 30,40 becomes small by pressing each absorber 30,40, the density of the fiber which comprises each absorber 30,40 increases correspondingly. As a result, of each absorber 30, 40, the pressed area (or the strongly pressed area) becomes the high density area 72, and the non-pressed area (or the weakly pressed area) becomes the low density area 71. .

Further, as shown in FIG. 4, in the present embodiment, the positions where the low density regions 71 and the high density regions 72 of the upper layer absorber 30 are formed, and the low density regions 71 and the high density regions 72 of the lower layer absorber 40. It is preferable that the positions where are formed are aligned. That is, the low density region 71 of the upper layer absorber 30 overlaps the low density region 71 of the lower layer absorber 40 in the thickness direction, and the high density region 72 of the upper layer absorber 30 is the same as the high density region 72 of the lower layer absorber 40. It will overlap in the thickness direction. In order to do this, for example, after the upper layer absorber 30 and the lower layer absorber 40 are overlapped, the absorbers 30 and 40 are simultaneously pressed to form the high density region 72 and the low density region 71. Is efficient.

As described above, by forming the high-density region 72 in the upper layer absorber 30 and the lower layer absorber 40, the shape retaining property of each absorber 30, 40 can be improved, and each absorber 30, 40 becomes difficult to lose its shape. In particular, as in the present embodiment, by forming the high-density regions 72 on the left and right sides of the low-density region 71, even if each absorber 30, 40 is compressed in the width direction, this low-density region 72 is formed. The upper opening 31 and the lower opening 41 formed in the density region 71 are not easily blocked. Thereby, even at the time of wearing, the absorption capacity and liquid diffusibility of each absorber 30,40 can be maintained.

In the present invention, the upper layer absorber 30 and the lower layer absorber 40 are overlapped. In this case, by disposing the absorbers 30 and 40 so that the high-density regions 72 overlap, it is possible to prevent the positions of the absorbers 30 and 40 from being shifted during wearing. In particular, in the present embodiment, after the upper layer absorber 30 and the lower layer absorber 40 are overlapped, the absorbers 30 and 40 are simultaneously pressed to form the high density region 72. By doing in this way, since the high-density area | region 72 of each absorber 30 and 40 adheres more closely, the position shift between the layers of each absorber 30 and 40 can be prevented effectively.

In the example shown in FIG. 4, the thickness of the low density region 71 of the upper layer absorber 30 is indicated by a symbol T1, and the thickness of the high density region 72 of the upper layer absorber 30 is indicated by a symbol T2. . As shown in FIG. 4, the thickness T2 of the high density region 72 is thinner than the thickness T1 of the low density region 71 (T2 <T1). For example, the thickness T2 of the high density region 72 is preferably 10% to 90%, and particularly preferably 10% to 50%, with respect to the thickness T1 of the low density region 71. For example, the thickness of the low density region 71 may be 10 mm to 20 mm. Further, the thickness of the high density region 72 may be 5 mm to 15 mm and is thinner than the low density region 71. It should be noted that the relationship between the thicknesses of the low density region 71 and the high density region 72 of the lower layer absorber 40 can be the same as that of the low density region 71 and the high density region 72 of the upper layer absorber 30 described above.

In the upper layer absorbent body 30, the density of the fibers constituting the low density region 71 is preferably 10% to 90% with respect to the density of the fibers constituting the high density region 72, and 10% to 50%. It is particularly preferred that When comparing the densities of the low density region 71 and the high density region 72, test pieces of the low density region 71 and the high density region 72 having the same volume are prepared, and the weights of the respective test pieces may be compared. . For this reason, the unit of density is weight (mg) / volume (cm ³ ). For example, the density of the low density region 71 is preferably 5 to 50 mg / cm ³ . Further, the density of the high density region 72 is 20 to 150 mg / cm ³ and is preferably in a range higher than the density of the low density region 71. The relationship between the density of the low density region 71 and the high density region 72 of the lower layer absorber 40 can be the same as that of the low density region 71 and the high density region 72 of the upper layer absorber 30 described above.

In the upper layer absorber 30, the lateral width B1 of the low density region 71 is preferably 20% to 80%, or 30% to 70%, for example, with respect to the entire width (maximum value) of the upper layer absorber 30. . In the upper layer absorber 30, a region other than the low density region 71 becomes a high density region 72. Further, it is preferable that the lateral width of the low density region 71 of the lower layer absorber 40 is made to coincide with the lateral width of the low density region 71 of the upper layer absorber 30. In the lower layer absorber 40, the region other than the low density region 71 becomes the high density region 72.

Further, as shown in FIGS. 3 and 4, in the upper absorber 30, the upper opening 31 is preferably formed in the low density region 71. As shown in the cross-sectional view of FIG. 4, the lateral width W1 of the upper opening 31 may be 10% to 90% with respect to the lateral width B1 of the low density region 71, and may be 50% to 90%. preferable. Note that, as described above, the lateral width of the lower opening 41 of the lower layer absorber 40 is narrower than the lateral width of the upper opening 31 of the upper layer absorber 30. Therefore, the lower opening 41 of the lower layer absorber 40 is also accommodated in the low density region 71 of the lower layer absorber 40.

In the second embodiment, the low density region 71 and the high density region 72 are formed in both the upper layer absorber 30 and the lower layer absorber 40. It can also be formed only on one of the absorber 30 and the lower layer absorber 40. In the second embodiment, the low density region 71 is a single connected region, but the low density region 71 may be divided into two or more regions. Moreover, the low density area | region 71 should just be formed in the crotch part 3 at least, and does not need to be formed in the front body 1 and the back body 2. FIG.

[1-3. Third Embodiment]
Then, with reference to FIG. 5, 3rd Embodiment of the absorbent article 100 which concerns on 1st invention is described. In the third embodiment, the description of the same configuration as that of the first embodiment described above will be omitted, and a description will be given focusing on a configuration different from that of the first embodiment. FIG. 5 shows a cross-sectional view of the absorbent article 100 as in FIG. As shown in FIG. 5, the absorbent article 100 according to the third embodiment includes a second lower layer absorber 80 in addition to the upper layer absorber 30 and the lower layer absorber 40.

As in the third embodiment shown in FIG. 5, the absorbent article 100 may have a configuration in which three or more layers of absorbers are interposed between the top sheet 10 and the back sheet 20. That is, the absorbent article 100 according to the third embodiment includes the second lower layer absorber 80 further below the upper layer absorber 30 and the lower layer absorber 40 described above (on the skin non-facing surface side). Hereinafter, the absorber positioned between the upper layer absorber 30 and the second lower layer absorber 80 is referred to as a first lower layer absorber 40. The opening formed in the first lower layer absorber 40 is referred to as a first lower opening 41.

The second lower layer absorber 80 can basically have the same configuration as the first lower layer absorber 40 described above. That is, as shown in FIG. 5, the second lower layer absorber 80 may have a second lower opening 81 at the center in the width direction. In this case, the second lower opening 81 of the second lower layer absorber 80 is longer than the upper opening 31 of the upper layer absorber 30 and the first lower opening 41 of the first lower layer absorber 40. It is preferable that the width is formed short. That is, it is preferable that the length and the width are narrowed in the order of the upper opening 31, the first lower opening 41, and the second lower opening 81.

Also, a fourth diffusion sheet 64 is provided between the first lower layer absorber 40 and the second lower layer absorber 80. Further, a fifth diffusion sheet 65 is provided between the second lower layer absorber 80 and the back sheet 20. In the present embodiment, the fourth diffusion sheet 64 and the fifth diffusion sheet 65 are composed of a single sheet member and encapsulate the second lower layer absorber 80. However, the fourth diffusion sheet 64 and the fifth diffusion sheet 65 may be composed of separate sheet members. The fourth diffusion sheet 64 and the fifth diffusion sheet 65 may be, for example, a thin paper such as tissue paper or a non-woven fabric.

Further, a second SAP layer 90 is formed between the first lower layer absorber 40 and the second lower layer absorber 80. The second SAP layer 90 is a layer formed by collecting a plurality of granular superabsorbent polymers (SAP). Specifically, the second SAP layer 90 is preferably disposed between the fourth diffusion sheet 64 and the second lower layer absorber 80. The second SAP layer 90 is formed on the outer side in the width direction of the second lower opening 81 of the second lower layer absorber 80. In particular, the second SAP layer 90 is outside in the width direction of the second lower opening 81 of the second lower layer absorber 80 and outside in the width direction of the first lower opening 41 of the first lower layer absorber 40. It is preferable to be formed in the region. Accordingly, the second SAP layer 90 can be sandwiched and held by the first lower layer absorber 40 and the second lower layer absorber 80, and scattering of the highly water-absorbing polymer constituting the second SAP layer 90 can be prevented. .

As described above, the absorbent article 100 according to the present invention can have a configuration in which absorbers are stacked in three or more stages. Although not shown, the absorber can be laminated in four or more stages or five or more stages.

[2. Second invention]
Then, with reference to FIGS. 6-10, the absorbent article which concerns on 2nd invention is demonstrated. In the description of the second invention, the same components as those in the first invention are given the same reference numerals. In the description of the second invention, the description of the first invention is used for the first invention and the configuration, and the repeated description is omitted.

In general absorbers, superabsorbent polymers (SAP) are dispersed or locally collected and arranged in order to prevent the liquid once absorbed from returning. However, SAP has a property that the absorption speed of the liquid is slow, and once the liquid is absorbed, it forms a gel and forms a so-called gel block. For this reason, for example, if SAP is arranged at a high density on the skin-facing surface side of the absorber, urine leakage may occur due to the slow absorption rate of SAP when a large amount of urination occurs at one time. is there. In addition, when repeated urination occurred, there was a risk that urine leakage occurred due to gelation of SAP and a decrease in absorption. On the other hand, when the SAP is arranged on the skin non-facing surface side of the absorber, the liquid may not reach the SAP, and the absorber positioned on the skin facing surface side than the SAP contains a lot of moisture. As a result, there was a risk that the liquid would return from the swollen absorbent body.

Therefore, the second invention has a high liquid diffusibility, can absorb urine effectively by SAP, and even when a large amount of urination or repeated urination occurs at once, urine leakage or urine reversion An absorbent article capable of preventing the above is provided.

With respect to the second invention, the inventor provides an SAP layer in which SAPs are densely arranged between a plurality of absorbers, and forms openings in the respective absorbers. The SAP layer was arranged. Thus, by disposing the SAP layer on both sides of the opening, the excreted liquid is diffused by the opening and effectively absorbed by the SAP layer. In addition, by disposing the SAP layer between a plurality of absorbers, a large amount of liquid can be prevented from touching the SAP layer at one time, so that the liquid can effectively penetrate into the SAP layer having a slow absorption rate. Urine leakage and urine reversion can be prevented.

The absorbent article which concerns on 2nd invention is the liquid-permeable top sheet 10 located in the skin opposing surface side, the liquid-impermeable back sheet 20 located in the skin non-facing surface side, the top sheet 10, and the back sheet And a plurality of absorbent bodies interposed between 20 and stacked in the thickness direction. The absorbent article has a longitudinal direction and a width direction orthogonal to the longitudinal direction.
The plurality of absorbers include at least an upper layer absorber 30 located on the top sheet 10 side and a lower layer absorber 40 located on the back sheet 20 side. The upper absorber 30 has an upper opening 31, and the lower absorber 40 has a lower opening 41. The lower opening 41 extends in the longitudinal direction of the absorbent article and at least partially overlaps the upper opening 31.
The absorbent article of the present invention further includes an SAP layer 50 formed by arranging a plurality of superabsorbent polymers SAP between the upper layer absorber 30 and the lower layer absorber 40. The SAP layer 50 is formed at least on both the left and right sides in the width direction of the opening penetrating portion 42 where the upper opening 31 and the lower opening 41 overlap.

By forming the upper opening 31 and the lower opening 41 in each of the upper layer absorber 30 and the lower layer absorber 40 as described above, the excreted urine is absorbed through these openings. Can be dispersed in the longitudinal direction. Furthermore, by forming the SAP layer 50 on both sides of the opening penetrating portion 42 where at least the upper opening 31 and the lower opening 41 overlap, the liquid diffused by the opening can be efficiently transferred by the SAP layer 50. Absorbed. As a result, even when a large amount of urination is performed at once, the liquid diffuses and is absorbed over a wide range of the SAP layer 50, so that urine leakage can be effectively prevented. Further, by interposing the SAP layer 50 between the upper layer absorber 30 and the lower layer absorber 40, the liquid that has penetrated into the upper layer absorber 30 and the liquid that has penetrated into the lower layer absorber 40 are transferred to the SAP layer 50. can do. As a result, the SAP layer 50 that has absorbed the liquid swells and gels, making it difficult to release the liquid, and thus the liquid can be prevented from returning. Furthermore, since a large amount of liquid can be prevented from touching the SAP layer 50 locally at one time, even the SAP layer 50 having a low liquid absorption rate can absorb a large amount of liquid over a wide range. , Can prevent urine leakage. In addition, even when urination is repeated, the liquid is efficiently dispersed, so that the liquid can be absorbed over a wide range of the SAP layer 50. Further, by disposing the SAP layer 50 between the upper layer absorber 30 and the lower layer absorber 40, even if the SAP layer 50 absorbs liquid and the volume expands, the feel is not easily transmitted to the wearer. This leads to a decrease in discomfort. Furthermore, in the present invention, the liquid is easily diffused in the longitudinal direction along the lower opening 41, and the SAP layers 50 are formed on both the left and right sides of the lower opening 41 in the width direction. It is possible to effectively prevent urine leakage from the urine.

In the second invention, it is preferable that the opening penetrating portion 42 is formed on the abdomen side of the wearer from the center in the longitudinal direction.

As in the above configuration, the opening penetrating portion 42 is formed at a position near the front body where excreted urine is easy to touch first, so that urine can be easily guided to the upper opening 31 and the lower opening 41. Become.

In the second invention, the lower opening 41 is preferably longer in the longitudinal direction than the upper opening 31. That is, it is preferable that the lower opening 41 has a part extending to the rear body side in the longitudinal direction and a part extending to the front body side in the longitudinal direction than the upper opening 31.

By forming the lower opening 41 longer than the upper opening 31 as in the above configuration, the liquid that has flowed into the lower opening 41 through the opening penetrating portion 42 is the skin non-facing surface of the upper absorber 30. Since the liquid is contained on the side, it is possible to more effectively prevent the liquid from returning. Further, once the liquid is confined in the lower opening 41, the liquid does not leak or return even if the SAP layer 50 located on both the left and right sides absorbs the liquid over a relatively long time. . Therefore, it is possible to efficiently absorb the liquid by using the SAP layer 50 having a low absorption rate.

In the second invention, it is preferable that the lower opening 41 has a wide portion 43 that is wider in the width direction than the upper opening 31 at least in part.

By making the lower opening 41 wider or partially wider than the upper opening 31 as in the above configuration, the liquid can be easily diffused in the width direction through the lower opening 41, and at the same time, The total amount of liquid that can be stored in the opening 41 increases. Thereby, the liquid can be transferred to the SAP layer 50 through the lower opening 41 over a wide range in the width direction.

In the second invention, it is preferable that a liquid diffusive sheet 63 is disposed between the lower layer absorber 40 and the SAP layer 50 in a region covering the lower opening 41. In this case, the SAP layer 50 may be formed at least partially at a position overlapping the lower opening 41 in the thickness direction. In this way, by positioning the SAP layer 50 on the liquid diffusive sheet 63, even when the SAP layer 50 and the lower opening 41 overlap, the SAP constituting the SAP layer 50 is located on the lower side. It does not fall into the opening 41.

As described above, by disposing the liquid diffusion sheet 63 between the lower layer absorber 40 and the SAP layer 50, the SAP layer 50 can be easily disposed even on the lower opening 41. For this reason, the structure that the lower side opening part 41 is located under the SAP layer 50 is realizable. In this case, the liquid diffusion effect and absorption effect can be further improved by the synergistic effect of the lower opening 41 and the SAP layer 50.

According to the second invention, the diffusibility of the liquid is high, the urine can be effectively absorbed by the SAP, and urine leakage and urine reversion are prevented even when a large amount of urination or repeated urination occurs at one time. The absorbent article which can be provided can be provided.

[2-1. First Embodiment]
With reference to FIG.6 and FIG.7, 1st Embodiment of the absorbent article 100 which concerns on 2nd invention is described. FIG. 6 is a plan view showing the absorbent article 100 according to the first embodiment. FIG. 7 is a cross-sectional view schematically showing a cross-sectional structure of the absorbent article 100 taken along line X3-X3 shown in FIG.

The absorbent article 100 according to the present embodiment relates to an absorbent pad. The absorbent pad can be used alone, or can be used on the inner surface side of a pants-type or tape-type disposable diaper. As shown in FIG. 6, the absorbent article 100 includes a front body 1 located on the wearer's abdomen side, a back body 2 located on the wearer's back side, and a crotch 3 located therebetween. And can be divided in the longitudinal direction.

Moreover, as FIG.6 and FIG.7 shows, the absorbent article 100 is fundamentally the liquid-permeable top sheet 10, the liquid-impermeable back sheet 20, and the some interposed between these. Absorbers 30 and 40 are provided. As shown in the cross-sectional view of FIG. 7, the plurality of absorbers 30 and 40 are stacked in the thickness direction. The top sheet 10 covers the skin facing surface side of the laminated absorbent bodies 30 and 40, and the back sheet 20 covers the skin non-facing surface side of the laminated absorbent bodies 30 and 40. . As shown in FIGS. 6 and 7, the top sheet 10 and the back sheet 20 are joined to each other around the absorbers 30 and 40. As a result, the absorbers 30 and 40 are surrounded by the joint between the top sheet 10 and the back sheet 20. The absorbent article 100 according to this embodiment includes two absorbers, an upper layer absorber 30 located on the top sheet 10 side and a lower layer absorber 40 located on the back sheet 20 side. Each of the upper layer absorber 30 and the lower layer absorber 40 can be made of a known absorbent material.

In the present embodiment, the upper layer absorbent body 30 is a combination of fluff pulp and a superabsorbent polymer, and has a configuration in which a plurality of granular superabsorbent polymers are supported by the fluff pulp. On the other hand, the lower layer absorber 40 consists only of fluff pulp, and the superabsorbent polymer is not distributed. Thus, among the plurality of absorbent bodies, at least the upper absorbent body 30 located near the skin of the wearer is made to contain the superabsorbent polymer, and the lower absorbent body 40 not containing this superabsorbent polymer is provided. This is a preferred embodiment of the present invention. Since the upper absorbent body 30 contains a superabsorbent polymer, liquid such as urine can be quickly absorbed by the upper absorbent body 30, so that the surface of the absorbent article 100 is smooth and uncomfortable for the wearer. Can be avoided. On the other hand, the lower layer absorber 40 absorbs liquid that could not be absorbed by the upper layer absorber 30. At this time, rather than providing a superabsorbent polymer in the lower layer absorber 40 to increase the absorption rate, the amount of liquid absorbed is more likely to absorb the liquid in a wide range of the lower layer absorber 40 without providing the superabsorbent polymer. It is effective in terms of improving For this reason, in the present embodiment, the superabsorbent polymer is sprayed only on the upper layer absorber 30 and the superabsorbent polymer is not sprinkled on the lower layer absorber 40.

As shown in FIGS. 6 and 7, in the present invention, an upper opening 31 is formed in the upper absorber 30. The upper opening 31 is a hole (slit) penetrating in the thickness direction of the upper absorber 30. The upper opening 31 is formed at least in a portion of the upper-layer absorber 30 that is easy to directly touch the urine excreted by the wearer at first. Specifically, as shown in FIG. 6, the upper opening 31 is preferably formed in a region on the stomach side of the wearer when the upper layer absorbent body 30 is divided into two regions in the longitudinal direction. . In particular, as shown in FIG. 6, the upper opening 31 is preferably formed at least partially in the front body 1 of the absorbent article 100. In the embodiment shown in FIG. 6, the upper opening 31 is formed from the front body 1 to the crotch 3. Further, the upper opening 31 may be formed only in the front body 1 of the absorbent article 100 and may not be formed in the crotch 3 or the back body 2. However, the position of the upper opening 31 may be formed in the crotch 3 or the back body 2 or may be formed in a length from the front body 1 through the crotch 3 to the back body 2. Good. Moreover, it is preferable that the upper side opening part 31 is located in the center part of the width direction. For example, when the upper-layer absorber 30 is equally divided into three regions of the left part, the central part, and the right part in the width direction, the upper opening 31 is preferably located at the center part in the width direction. .

As shown in FIGS. 6 and 7, the upper opening 31 has a predetermined length L1 (maximum value) and a predetermined lateral width W1 (maximum value). The length L1 and the lateral width W1 of the upper opening 31 may be appropriately adjusted according to the size of the absorbent article 100. For example, when the absorbent article 100 is an absorbent pad for adults, the length L1 of the upper opening 31 may be 10 mm to 100 mm, or 20 mm to 60 mm. Further, the lateral width W1 of the upper opening 31 is at least shorter than the length L1, and may be, for example, 5 mm to 30 mm, or 10 mm to 20 mm. Thus, the upper side opening part 31 becomes a shape long in a longitudinal direction. In the example shown in FIG. 6, the upper opening 31 is formed in a rectangular shape extending in the longitudinal direction. However, the shape of the upper opening 31 is not limited to the illustrated shape, and various shapes such as a triangle, a pentagon, other polygons, a circle, and an ellipse may be employed.

Further, as shown in FIGS. 6 and 7, in the present invention, a lower opening 41 is formed in the lower layer absorber 40. The lower opening 41 is a hole (slit) penetrating in the thickness direction of the lower layer absorber 40. As shown in FIG. 6, the lower opening 41 has a shape extending in the longitudinal direction and is longer than the upper opening 31 in the longitudinal direction. Specifically, the lower opening 41 is longer than the upper opening 31 toward the front end in the longitudinal direction, and is longer than the upper opening 31 toward the rear end in the longitudinal direction. It has the site | part made. In the present embodiment, the lower opening 41 has a length extending from the front body 1 to the back body 2 beyond the crotch 3 and extending in the longitudinal direction. Also, as shown in FIG. 6, the lower opening 41 has a wide portion 43 that is partially formed wider in the width direction than the upper opening 31.

More specifically, as shown in FIGS. 6 and 7, the lower opening 41 has a predetermined length L2 (maximum value) and a predetermined lateral width W2 (maximum value). Here, as shown in the figure, the length L2 and the lateral width W2 of the lower opening 41 of the lower layer absorber 40 are longer than the length L1 and the lateral width W1 of the upper opening 31 of the upper layer absorber 30, respectively. (L2> L1, W2> W1). For example, the length L2 of the lower opening 41 is preferably 150% to 500%, or 200% to 400% with respect to the length L1 of the upper opening 31. The lateral width W2 of the lower opening 41 is preferably 110% to 300%, or 150% to 200% with respect to the lateral width W1 of the upper opening 31. Thus, since the length and width of the lower opening 41 are longer than the length and width of the upper opening 31, basically, the opening area of the lower opening 41 is the opening area of the upper opening 31. Bigger than. As shown in FIG. 6, the shape of the lower opening 41 is preferably a shape in which the lateral width of the wide portion 43 is partially expanded on the basis of a rectangular shape. The partial wide portion 43 may be a rectangle, another polygon, or a circle or an ellipse.

Further, the lower opening 41 of the lower layer absorber 40 is formed at a position at least partially overlapping with the upper opening 31 of the upper layer absorber 30 in the thickness direction. In the present specification, a portion where the upper opening 31 and the lower opening 41 overlap in the thickness direction is referred to as an opening penetrating portion 42. In the present embodiment, the lower opening 41 is wider in length and width than the upper opening 31. In this case, the entire upper opening 31 preferably overlaps the lower opening 41. In this case, the entire upper opening 31 corresponds to the opening penetrating portion 42 described above. Further, as described above, in the present embodiment, the upper opening 31 of the upper-layer absorber 30 is formed in the front body 1, so that the opening through portion 42 where the upper opening 31 and the lower opening 41 overlap is also provided. , The front body 1 is formed. However, the upper opening 31 may have a portion that does not overlap the lower opening 41. For example, when the entire area of the upper opening 31 is 100%, the upper opening 31 has 50% to 100% or 90% to 100% of the area overlapping the lower opening 41. It is preferable. In this way, by overlapping a part or all of the upper opening 31 with the lower opening 41, these two openings 31, 41 are communicated in the thickness direction.

As described above, by forming the upper opening 31 and the lower opening 41 in the upper layer absorber 30 and the lower layer absorber 40, the urine excreted by the wearer is separated from the upper opening 31 and the lower side absorber. It diffuses in the longitudinal direction through the opening 41. Specifically, since the lower opening 41 is formed longer in the longitudinal direction than the upper opening 31, the liquid that has flowed into the lower opening 41 through the opening penetrating portion 42 is lower in the lower opening 41. It diffuses in the longitudinal direction of the absorbent article 100 so as to be contained in the absorbent article 100. Moreover, since the surface areas of the upper layer absorber 30 and the lower layer absorber 40 are increased by forming the upper opening 31 and the lower opening 41, liquid such as urine can be rapidly absorbed. Furthermore, liquid such as urine excreted on the upper layer absorber 30 can be guided to the lower layer absorber 40 through the upper opening 31. Thereby, the liquid can be efficiently absorbed by both the upper layer absorber 30 and the lower layer absorber 40.

In this embodiment, the wide portion 43 of the lower opening 41 overlaps the upper opening 31. In other words, the wide portion 43 of the lower opening 41 corresponds to the opening penetrating portion 42. As described above, since the wide portion 43 of the lower opening 41 overlaps the upper opening 31, a large amount of liquid flows into the lower opening 41 through the upper opening 31 at once. However, a relatively large amount of liquid can be stored in the wide portion 43. For this reason, even when a large amount of liquid flows into the lower opening 41 at a time, it is possible to prevent the liquid from overflowing. Further, since the liquid stored in the wide portion 43 of the lower opening 41 is gradually diffused in the longitudinal direction along the lower opening 41, the liquid can be prevented from returning.

As shown in FIGS. 6 and 7, in the present embodiment, the shapes of the upper layer absorber 30 and the lower layer absorber 40 are different. That is, the upper layer absorber 30 is molded into a so-called gourd type or hourglass type, whereas the lower layer absorber 40 is molded into a rectangular shape. Thus, the shapes of the upper layer absorber 30 and the lower layer absorber 40 can be made different. In particular, the upper layer absorber 30 has an extending portion 32 that extends more outward in the width direction than the lower layer absorber 40 in the front body 1 and the back body 2 when superimposed on the lower layer absorber 40. Yes. Therefore, in the present embodiment, the upper layer absorber 30 is formed larger than the lower layer absorber 40 by the extension portion 32. Thus, by increasing the size of the upper layer absorber 30, when urine or the like is excreted, it can be quickly absorbed in a wide range of the upper layer absorber 30, which leads to prevention of urine leakage. In addition, the lower layer absorber 40 disposed below the upper layer absorber 30 may be formed into a gourd shape like the upper layer absorber 30, but the wearing feeling of the absorbent article 100 may be reduced. , Not very preferable. Therefore, as in the present embodiment, the shape of the lower layer absorbent body 40 is a rectangular shape smaller than that of the upper layer absorbent body 30, thereby increasing the amount of absorption of the entire absorbent article 100 and maintaining a good feeling of wear. can do.

7, the absorbent article 100 according to this embodiment includes a first diffusion sheet 61 and a second diffusion sheet 62. As shown in FIG. 7, the first diffusion sheet 61 is disposed between the top sheet 10 and the upper layer absorber 30. The second diffusion sheet 62 is disposed between the lower layer absorbent body 40 and the back sheet 20 and has a portion that covers the skin non-facing surface of the lower layer absorbent body 40, and the side of each absorbent body 30, 40. And a portion that covers a part of the skin-facing surface of the upper-layer absorber 30. The first diffusion sheet 61 and the second diffusion sheet 62 are overlapped and joined to each other on the left and right sides in the width direction on the skin facing surface side of the upper absorbent body 30. Thus, the first diffusion sheet 61 and the second diffusion sheet 62 are joined to each other so as to enclose the periphery of the upper layer absorber 30 and the lower layer absorber 40. The first diffusion sheet 61 and the second diffusion sheet 62 are sheet-like members having liquid diffusibility capable of absorbing and diffusing liquid. Each of the diffusion sheets 61 and 62 may be a thin paper such as tissue paper or a non-woven fabric.

6 and 7, the absorbent article 100 according to the present embodiment further includes an SAP layer 50. As shown in the sectional view of FIG. 7, the SAP layer 50 is formed between the upper layer absorber 30 and the lower layer absorber 40. The SAP layer 50 is a layer formed by collecting a plurality of granular superabsorbent polymers (SAP). Basically, the SAP layer 50 is a layer made of only a superabsorbent polymer. The SAP layer 50 is held between the absorbers 30 and 40 by sandwiching a plurality of superabsorbent polymers between the upper absorber 30 and the lower absorber 40. The thickness of the SAP layer 50 can be adjusted as appropriate, but may be, for example, about 0.1 mm to 2 mm, or about 0.5 mm to 1.5 mm.

Further, as shown in the plan view of FIG. 6, the SAP layers 50 are formed at least on the left and right sides in the width direction of the opening penetrating portion 42 where the upper opening 31 and the lower opening 41 overlap. Further, in the present embodiment, each of the left and right SAP layers 50 includes not only a portion located on the left and right sides of the opening penetrating portion 42 but also a portion extending to the front end side in the longitudinal direction from the opening penetrating portion 42 and the opening penetrating portion. And a portion extending further to the rear end side in the longitudinal direction than the portion 42. Specifically, the left and right SAP layers 50 are approximately the same length as the lower opening 41 or longer than the lower opening 41, and extend along the left and right sides of the lower opening 41. Is formed.

As described above, by providing the SAP layers 50 between the upper layer absorber 30 and the lower layer absorber 40 at least on both the left and right sides of the opening penetrating portion 42, the lower opening portion 41 is passed through the opening penetrating portion 42. The liquid that has flowed into can be absorbed by the SAP layer 50. More specifically, as described above, since the upper opening 31 and the lower opening 41 are formed in each of the upper absorber 30 and the lower absorber 40, they flow into these openings 31, 41. The liquid is dispersed in the longitudinal direction of the absorbent article. Then, by forming the SAP layer 50 at least on both sides of the opening penetrating portion 42, the liquid diffused by the openings 31 and 41 is efficiently absorbed by the SAP layer 50. As a result, even when a large amount of urination is performed at a time, the urine leakage can be effectively prevented because it is diffused and absorbed over a wide range of the SAP layer 50. Further, by interposing the SAP layer 50 between the upper layer absorber 30 and the lower layer absorber 40, the liquid that has penetrated into the upper layer absorber 30 and the liquid that has penetrated into the lower layer absorber 40 are transferred to the SAP layer 50. can do. As a result, the SAP layer 50 that has absorbed the liquid swells and gels, making it difficult to release the liquid, and thus the liquid can be prevented from returning. Furthermore, since a large amount of liquid can be prevented from touching the SAP layer 50 locally at one time, even the SAP layer 50 having a low liquid absorption rate can absorb a large amount of liquid over a wide range. , Can prevent urine leakage.

Further, as shown in the sectional view of FIG. 7, in the present embodiment, the SAP layer 50 is formed on both the left and right sides of the lower opening 41 in the width direction. That is, the SAP layer 50 does not overlap the lower opening 41 in the thickness direction. Thus, by providing the SAP layer 50 in a range that does not overlap the lower opening 41, the entire SAP layer 50 can be completely sandwiched between the upper layer absorber 30 and the lower layer absorber 40. For this reason, even when the wearer of the absorbent article moves greatly, the superabsorbent polymer constituting the SAP layer 50 can be prevented from falling into the lower opening 41.

[2. Second Embodiment]
Next, a second embodiment of the absorbent article 100 according to the second invention will be described with reference to FIG. FIG. 8 is a plan view showing the absorbent article 100 according to the second embodiment. In the second embodiment, description of the same configuration as that of the first embodiment described above is omitted, and a configuration different from that of the first embodiment is described.

As shown in FIG. 8, in the absorbent article 100 according to the second embodiment, the width of the opening through portion 42 in which the upper opening 31 of the upper absorber 30 and the lower opening 41 of the lower absorber 40 overlap. The SAP layer 50 is formed only on the left and right sides in the direction. Specifically, since the opening penetrating portion 42 is formed in the front body 1 of the absorbent article 100, the SAP layer 50 is also formed in the front body 1 of the absorbent article 100. In this way, if the SAP layers 50 are formed at least on both the left and right sides of the opening penetrating portion 42 in the width direction, the liquid can be diffused in the longitudinal direction by the lower opening portion 41, and high water absorption is provided around the opening penetrating portion 42. Liquid can be collected by polymer (SAP). For this reason, the SAP layer 50 can efficiently absorb the liquid and prevent its reverse.

Further, in the absorbent article 100 according to the second embodiment, unlike the first embodiment described above, the upper opening 31 of the upper absorbent body 30 is formed in an elliptical shape. Further, the lower opening 41 of the lower layer absorber 40 is formed so that the lateral width thereof is wider than the lateral width of the upper opening 31 as a whole. As described above, the entire lateral width of the lower opening 41 may be formed wider than the lateral width of the upper opening 31.

[3. Third Embodiment]
Subsequently, a third embodiment of the absorbent article 100 according to the second invention will be described with reference to FIGS. 9 and 10. FIG. 9 is a plan view showing an absorbent article 100 according to the third embodiment. FIG. 10 is a cross-sectional view schematically showing a cross-sectional structure of the absorbent article 100 taken along line X4-X4 shown in FIG. The third embodiment will be described focusing on a configuration different from the above-described first embodiment.

As shown in the plan view of FIG. 9, the lower opening 41 includes a base portion 44 extending linearly along the longitudinal direction, and a plurality of base portions 44 extending from the base portion 44 toward the left and right outer sides in the width direction. And a branch portion 45. More specifically, in the present embodiment, the main portion 44 of the lower opening 41 has a longer length in the longitudinal direction than the upper opening 31, and passes from the front body 1 through the crotch 3 to the rear. It is formed with a length that reaches the body 2. Further, the lateral width of the trunk portion 44 of the lower opening 41 is wider than the lateral width of the upper opening 31. In addition, SAP layers 50 are formed on both the left and right sides of the backbone 44 of the lower opening 41. On the other hand, in the present embodiment, the branch portions 45 are formed one by one at the left and right at the position on the front end side in the longitudinal direction, and one by one at the left and right at the position at the rear end side in the longitudinal direction. Is formed. In this manner, the branch portions 45 are formed so as to extend from the trunk portion 44 toward the left and right outer sides in the width direction. For this reason, the branch part 45 overlaps with the SAP layer 50 in the thickness direction at least partially. Further, as shown in FIG. 9, the branch portions 45 are preferably formed on the left and right sides in the width direction of the opening penetrating portion 42 where the upper opening 31 and the lower opening 41 overlap. Thus, by providing the branch portions 45 on the left and right sides of the opening penetrating portion 42, the liquid flowing from the opening penetrating portion 42 can be quickly diffused outward in the width direction.

FIG. 10 shows a cross-sectional view at a position where the branch portion 45 of the lower opening 41 is formed. As shown in FIG. 10, the SAP layer 50 overlaps the branch portion 45 of the lower opening 41 in the thickness direction. Since the SAP layer 50 is formed by accumulating a plurality of granular superabsorbent polymers (SAP), if the SAP layer 50 overlaps the branch portion 45, the superabsorbent polymer is separated into this amount. There is a risk of falling off the branch 45. Therefore, in the third embodiment, as shown in FIG. 10, a third diffusion having liquid diffusibility is provided so as to cover the lower opening 41 between the SAP layer 50 and the lower layer absorber 40. A sheet 63 is provided. Similar to the first diffusion sheet 61 and the second diffusion sheet 62, the third diffusion sheet 63 is a sheet-like member having liquid diffusibility that can absorb and diffuse liquid. The third diffusion sheet 63 may be a thin paper such as tissue paper or a non-woven fabric. Examples of the nonwoven fabric include air-through nonwoven fabric, point bond nonwoven fabric, spunbond nonwoven fabric, and melt blown nonwoven fabric.

As shown in FIG. 10, the SAP layer 50 is formed on the third diffusion sheet 63 by providing the third diffusion sheet 63 so as to entirely cover the skin facing surface of the lower layer absorber 40. be able to. Thereby, since the SAP layer 50 is held so as to be sandwiched between the third diffusion sheet 63 and the upper layer absorber 30, the superabsorbent polymer constituting the SAP layer 50 is formed in the lower opening of the lower layer absorber 40. It can prevent falling to 41. Moreover, by covering the lower opening 41 of the lower layer absorber 40 with the third diffusion sheet 63, the liquid flowing into the lower opening 41 can be efficiently diffused. Thereby, since a liquid is absorbed in the wide range of the upper layer absorber 30 and the lower layer absorber 40, the absorption capability of the two absorbers 30 and 40 can be utilized effectively. In particular, it is difficult for the liquid to penetrate into the gap between the upper layer absorber 30 and the lower layer absorber 40. Therefore, by providing the third diffusion sheet 63 in the gap between the upper layer absorber 30 and the lower layer absorber 40, the gap between the upper layer absorber 30 and the lower layer absorber 40, which is normally difficult to absorb liquid, is provided. Liquid can also penetrate into the area. Furthermore, by providing the third diffusion sheet 63 between the SAP layer 50 and the lower layer absorber 40, the liquid diffused by the third diffusion sheet 63 can be quickly absorbed by the SAP layer 50. Therefore, the liquid that has flowed into the opening penetrating portion 42 can be reliably collected by the SAP layer 50 while being diffused over a wide range by the third diffusion sheet 63. Thereby, even if a large amount of liquid is discharged to the opening penetrating portion 42, it is possible to prevent the liquid from leaking to the outside. In addition, since the SAP layer 50 is disposed between the upper layer absorber 30 and the lower layer absorber 40, even if the SAP layer 50 absorbs a large amount of liquid and expands its volume, the feel of the SAP layer 50 is felt to the wearer. Difficult to communicate. Therefore, it is possible to provide the wearer with a good wearing feeling that does not change between before and after liquid excretion.

In the present embodiment, as an example of the shape of the lower opening 41, the branch portion 45 extends from the front side and the rear side of the trunk portion 44 toward the left and right sides. However, the shape of the lower opening 41 is not limited to this, and may be, for example, a Y-shape in which two branch portions 45 extend from the front end or the rear end of the trunk portion 44. . Further, in the present embodiment, the example in which the SAP layer 50 is superimposed on the branch portion 45 of the lower opening 41 has been described. However, if the third diffusion sheet 63 is provided between the SAP layer 50 and the lower layer absorber 40, the SAP layer 50 can be formed so as to overlap the backbone 44 of the lower opening 41. .

In the present embodiment, the example in which the branch portion 45 of the lower opening 41 overlaps the SAP layer 50 in the thickness direction has been described. However, in the lower opening 41, the basic portion 44 is wider than the region between the left and right SAP layers 50, and the left and right side edges of the basic portion 44 overlap the SAP layer 50 in the thickness direction. May be. Further, in the form in which the backbone 44 of the lower opening 41 overlaps the SAP layer 50, the branch 45 may not be formed in the lower opening 41. Even in this case, by disposing the third diffusion sheet 63 between the lower opening 41 and the SAP layer 50, the superabsorbent polymer forming the SAP layer 50 is dropped into the lower opening 41. Can be prevented.

As mentioned above, in this specification, in order to express the content of the present invention, the embodiment of the present invention was described with reference to the drawings. However, the present invention is not limited to the above-described embodiments, but includes modifications and improvements obvious to those skilled in the art based on the matters described in the present specification.

The present invention relates to absorbent articles such as disposable diapers and absorbent pads. Therefore, the present invention can be suitably used in the manufacturing industry for absorbent articles and the like.

DESCRIPTION OF SYMBOLS 1 ... Front body 2 ... Back body 3 ... Crotch part 10 ... Top sheet 20 ... Back sheet 30 ... Upper layer absorber 31 ... Upper opening part 32 ... Extension part 40 ... Lower layer absorber 41 ... Lower opening part 41 ... Lower side Opening 42 ... Opening penetration part 43 ... Wide part 44 ... Main part 45 ... Branching part 50 ... SAP layer 61 ... First diffusion sheet 62 ... Second diffusion sheet 63 ... Third diffusion sheet 64 ... Fourth diffusion sheet 65 ... Fifth diffusion sheet 71 ... low density region 72 ... high density region 80 ... second lower layer absorber 81 ... second lower opening 90 ... second SAP layer 100 ... absorbent article

Claims (10)

1. In an absorbent article having a crotch part (3) positioned between a front body (1) located on the abdomen side of the wearer at the time of wearing and a back body (2) located on the back side of the wearer,
   A liquid-permeable top sheet (10) located on the skin facing surface side;
   A liquid impervious backsheet (20) located on the skin non-facing surface side;
   A plurality of absorbers interposed between the top sheet (10) and the back sheet (20) and stacked in the thickness direction;
   The plurality of absorbers are at least
   An upper absorber (30) located on the topsheet (10) side;
   A lower layer absorber (40) located on the backsheet (20) side,
   The upper layer absorbent body (30) has an upper opening (31) extending in the longitudinal direction and having a predetermined length and width,
   The lower layer absorber (40) has a lower opening (41) extending in the longitudinal direction and having a length and width shorter than the upper opening (31),
   The upper opening (31) and the lower opening (41) are at least partially overlapped in the thickness direction.
2. The absorbent article according to claim 1, wherein a liquid diffusive sheet is disposed between the upper layer absorber (30) and the lower layer absorber (40).
3. An SAP layer (50) formed by disposing a plurality of superabsorbent polymers (SAP) between the upper layer absorber (30) and the lower layer absorber (40);
   The absorbent article according to claim 1, wherein the SAP layer (50) is formed at least on the left and right sides in the width direction of the lower opening (41).
4. The said SAP layer (50) is formed in the area | region which does not overlap with the said upper side opening part (31) in the thickness direction at the both right and left sides of the width direction of the said lower side opening part (40). Absorbent articles.
5. The upper layer absorber (30) and / or the lower layer absorber (40) are either
   A low density region (71) in which the density of fibers constituting the absorber is relatively low on both the left and right sides in the width direction of the upper opening (31) or the lower opening (41);
   The absorptive article according to claim 1. It has a high-density field (72) where the density of the fiber which constitutes the absorber is comparatively high in the right-and-left outside of the width direction of the low-density field (71).
6. A liquid-permeable top sheet (10) located on the skin facing surface side;
   A liquid impervious backsheet (20) located on the skin non-facing surface side;
   A plurality of absorbers interposed between the top sheet (10) and the back sheet (20) and stacked in the thickness direction;
   An absorbent article having a longitudinal direction and a width direction perpendicular thereto,
   The plurality of absorbers are at least
   An upper absorber (30) located on the topsheet (10) side;
   A lower layer absorber (40) located on the backsheet (20) side,
   The upper layer absorber (30) has an upper opening (31),
   The lower absorbent body (40) has a lower opening (41) extending in the longitudinal direction and at least partially overlapping the upper opening (31);
   An SAP layer (50) formed by disposing a plurality of superabsorbent polymers (SAP) between the upper layer absorber (30) and the lower layer absorber (40);
   The SAP layer (50) is formed at least on the left and right sides in the width direction of the opening penetrating portion (42) where the upper opening (31) and the lower opening (41) overlap. .
7. The absorptive article according to claim 6. The opening penetration part (42) is formed in the wearer's stomach side rather than the center of the longitudinal direction.
8. The absorbent article according to claim 6, wherein the lower opening (41) is longer in the longitudinal direction than the upper opening (31).
9. The absorbent article according to claim 6, wherein the lower opening (41) has, at least in part, a wide portion (43) wider in the width direction than the upper opening (31).
10. Between the lower layer absorber (40) and the SAP layer (50), a liquid diffusive sheet (63) is disposed in a region covering the lower opening (41),
    The SAP layer (50) is at least partially formed at a position overlapping the lower opening (41) in the thickness direction, but is located on the liquid diffusive sheet (63). The absorbent article according to claim 6, wherein the absorbent article does not fall into the lower opening (41).

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