TWI594741B - Absorbent article - Google Patents

Description

Absorbent article

The present invention relates to an absorbent article for wearing a lower coat of a wearer and absorbing a liquid such as urine.

For the purpose of absorbing and retaining bodily fluids, absorbent articles worn in the lower end of the wearer are conventionally known. Examples of absorbent articles are disposable diapers, absorbent pads, and sanitary napkins. Further, in the disposable diaper, for example, a pull-on diaper that joins the left and right side portions of the front and back bodies, or a belt-type diaper that is attached to the front body by a fixing belt attached to the back body is known.

Further, a general absorbent article is provided with an absorbent body composed of an absorbent fiber, a superabsorbent polymer (SAP), or the like between the liquid-permeable topsheet and the liquid-impermeable backsheet. Such an absorbent article is a structure in which the top sheet covers the skin facing surface of the absorbent body, and the back sheet covers the skin non-opposing surface of the absorbent body. Therefore, liquid such as urine excreted by the wearer penetrates the topsheet and is absorbed and held by the absorbent body. Further, the liquid held in the absorber is prevented from leaking to the outside by the liquid-impermeable back sheet disposed on the back side of the absorber.

Further, it is a technique for forming an opening (slit) penetrating in the thickness direction on the absorber constituting the absorbent article (Patent Document 1, Patent Document 2, and Patent Document 3). Such a slit is formed on the absorbent body for various purposes such as improving the diffusibility of the liquid, improving the fit to the wearer's body, preventing the solid matter such as urine and the like from coming into contact with the wearer's skin for a long period of time, and easily bending the absorbent body. .

For example, Patent Document 1 discloses a technique of forming a Y-shaped opening for a single-layer absorber. In addition, Patent Document 2 and Patent Document 3 discloses a technique in which a plurality of absorbers are stacked in the thickness direction to form openings in the respective absorbers. In particular, in the absorbent article of Patent Document 2, an upper through hole is formed in the upper absorbent body, and a lower through hole is formed in the lower absorbent body, and the upper through hole and the lower through hole are disposed non-overlapping. Further, the absorbent article of Patent Document 3 is provided with a first layer on the opposite side of the skin and a second layer on the non-opposing side of the skin, and the first layer has side slits formed on the left and right sides, and second A central opening at the center and side slits at the left and right sides thereof are formed on the layer. 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 disposed to overlap each other.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] JP-A-2012-090818

[Patent Document 2] JP-A-2010-200968

[Patent Document 3] JP-A-2014-014726

As shown in the above-described Patent Documents 1 to 3, since the opening (slit) is formed in the absorber, the surface area of the absorber that comes into contact with the liquid such as urine is enlarged, so that the absorption force of the absorber is improved. Further, since the liquid can be diffused along the opening of the absorber, the liquid diffusibility of the absorber can be improved by providing the opening in the absorber. Further, in the absorbent article of Patent Document 2 and Patent Document 3, the absorbent body is stacked in two or more layers, and the discharge liquid is provided in the upper absorbent body to guide the discharged liquid to the lower layer through the opening of the upper absorbent body. Absorber. Thereby, it is considered that the absorption ability of both the upper layer absorber and the lower layer absorber can be utilized. Therefore, a plurality of absorbers in which an opening is formed by lamination can be said to be ideal in terms of improving liquid absorption or liquid diffusion. of.

However, in the absorbent article of Patent Document 2, the through hole of the upper absorbent body and the through hole of the lower absorbent body are disposed so as not to overlap each other, and the liquid discharged by the wearer does not flow into the lower layer even if it passes through the through hole of the upper absorbent body. Through hole of the body. Therefore, the through hole of the lower absorbent body of the absorbent article of Patent Document 2 does not contribute to the improvement of the liquid absorption force or the liquid diffusibility.

Further, the absorbent article of Patent Document 3 is provided with a side slit of the first layer of the absorbent body and a side slit of the second layer. Therefore, in the absorbent article of Patent Document 3, the liquid discharged by the wearer passes through the side slit of the first layer, and there is a possibility of further reaching the side slit of the second layer, and the improvement of the absorption force can be expected. However, a general absorbent article is worn in the lower position so as to be sandwiched between the wearer's feet, and is compressed in the width direction in a state of being worn by the wearer. In this case, as in the absorbent article of Patent Document 3, the opening of the upper absorbent body and the opening of the lower absorbent body are formed in substantially the same length and width, and are worn in the width direction when worn in the lower stage of the wearer. The compression has both the upper layer and the lower opening portion being collapsed at the same time. As described above, when the space for forming the opening portion is not formed, the liquid is less likely to flow from the opening portion of the upper layer absorber to the lower layer absorber, and there is a problem that the absorption capacity of the lower layer absorber cannot be sufficiently exhibited. Further, if the opening of the upper absorbent body is not formed, the liquid is less likely to diffuse along the opening, so that the entire absorbent body has a problem that the liquid diffusibility is lowered.

Further, in the absorbent article of Patent Document 3, when the upper and lower openings are formed in substantially the same length and width, the liquid flowing into the upper opening may not be collected by the lower absorbent body, and then This reaches the back sheet through the opening of the lower layer. In this case, there is a problem that the lower layer absorbent body cannot be used to efficiently collect the liquid excreted by the wearer.

For this reason, in the case of an absorbent article having a plurality of layer absorbers having an opening formed therein, techniques for effectively utilizing the absorptivity, liquid diffusibility, and collection ability of the absorbers of the respective layers are being sought.

As a result of intensive studies on the means for solving the problems of the prior art, the inventors of the present invention have the opening of the upper absorbent body formed larger than the opening of the lower absorbent body in the absorbent article including the plurality of layers of the absorbent body having the opening. And the upper and lower openings are arranged overlappingly. As described above, by providing a large upper opening portion and a small lower opening portion at least partially overlapping, it is possible to effectively utilize the absorption capacity, liquid diffusibility, and collection ability of the respective layers of the absorbent body. Then, the inventors of the present invention have conceived that the problems of the prior art can be solved based on the above findings, and the present invention is completed. Specifically, the present invention has the following configuration.

The present invention relates to an absorbent article such as a disposable diaper or an absorbent pad.

The absorbent article of the present invention has a lower stage 3 that is positioned between the front body 1 positioned on the ventral side of the wearer and the back body 2 positioned on the back side of the wearer when worn.

The absorbent article of the present invention comprises: a liquid-permeable topsheet 10 on the opposite side of the skin; a liquid-impermeable backsheet 20 on the non-opposite side of the skin; and a plurality of absorbers, etc. Between the topsheet 10 and the backsheet 20 and overlapping in the thickness direction.

Here, the plurality of absorbers include at least an upper layer absorber 30 on the side of the top sheet 10, and a lower layer absorber 40 on the side of the back sheet 20.

The upper layer absorber 30 has an upper opening portion 31 that extends in the longitudinal direction and has a predetermined length and width. Further, the lower layer absorber 40 has a lower opening portion 41 that extends in the longitudinal direction and has a shorter length and a width than the upper opening portion 31.

Further, the upper opening portion 31 and the lower opening portion 41 are at least partially overlapped in the thickness direction.

With the above-described configuration, the upper side opening portion 31 of the upper layer absorber 30 and the lower side opening portion 41 of the lower layer absorber 40 are superposed, and the liquid discharged by the wearer is guided to the lower opening portion 41 through the upper opening portion 31. The liquid can be absorbed over a wide range of absorbent bodies. In addition, when the upper opening 31 is formed larger than the lower opening 41, when the absorbent article is worn, even if the upper absorbent body 30 and the lower absorbent body 40 are compressed in the width direction and the lower opening 41 is closed, It is also possible to open the upper opening portion 31. Thereby, even if the absorbent article is worn, the liquid such as urine can be guided to the lower absorbent body 40 through the upper opening 31, so that the absorption capacity of the absorbent article can be improved. Further, since liquid such as urine is diffused along the upper opening portion 31 of the upper layer absorbent body 30 and the lower opening portion 41 of the lower layer absorbent body 40, the liquid diffusibility of the entire absorbent article can be improved. In addition, since the lower opening portion 41 of the lower layer absorber 40 is provided smaller than the upper opening portion 31 of the upper layer absorber 30, the liquid that has passed through the upper opening portion 31 is easily collected by the lower layer absorber 40. That is, it is possible to reduce the possibility that the discharged liquid passes through both the upper opening portion 31 and the lower opening portion 41 and is not collected by the absorber to reach the back sheet 20. Therefore, with the above configuration, the absorption capacity, liquid diffusibility, and collection ability of the absorbent article can be improved.

In the absorbent article of the present invention, a liquid diffusing sheet is preferably disposed between the upper absorbent core 30 and the lower absorbent core 40. In particular, the liquid diffusing sheet is preferably located between the upper opening portion 31 of the upper layer absorbent body 30 and the lower side opening portion 41 of the lower layer absorbent body 40. Further, it is preferable that an opening portion is not formed in the liquid diffusion sheet between the upper opening portion 31 and the lower opening portion 41.

According to the above configuration, the liquid diffusion sheet is disposed between the respective absorbers 30 and 40 in which the openings 31 and 41 are formed, and is absorbed by the upper layer. The liquid absorbed by the body 30 or the liquid that has passed through the upper opening 31 is diffused over a wide range by the liquid diffusing sheet. Thereby, the absorption capacity of the upper layer absorber 30 and the lower layer absorber 40 can be utilized efficiently.

The absorbent article of the present invention preferably further comprises an SAP layer 50. This SAP layer 50 is a layer formed by disposing a plurality of superabsorbent polymers (SAP) between the upper layer absorber 30 and the lower layer absorber 40.

In this case, it is preferable that the SAP layer 50 is formed at least on the left and right sides in the width direction of the lower opening portion 41.

According to the above configuration, by providing the SAP layer 50 between the upper layer absorber 30 and the lower layer absorber 40, the liquid diffused by the liquid diffusing 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 is expanded, the touch is hard to be transmitted to the wearer.

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

As described above, by disposing the SAP layer 50 at a position that does not overlap the upper opening portion 31 of the upper layer absorbent body 30, the SAP layer 50 can be sandwiched and fixed by the upper layer absorber 30 and the lower layer absorber 40. Therefore, 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 portion 31 or the lower opening portion 41. In other words, when the superabsorbent polymer enters the openings 31 and 41, when the polymer absorbs the liquid, the openings 31 and 41 are clogged, and the liquid diffusibility of the absorbers 30 and 40 is damaged. . Further, since the fibrous materials constituting the absorbers 30 and 40 are not disposed in the openings 31 and 41, if the superabsorbent polymer enters the openings 31 and 41, the rough touch of the superabsorbent polymer will be Passing to the wearer, the skin feels bad. 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 on the upper side. The position at which the upper opening portion 31 of the layer absorber 30 overlaps.

In the absorbent article of the present invention, either or both of the upper absorbent core 30 and the lower absorbent core 40 preferably have a low density region 71 and a high density region 72. The low-density region 71 is a region on the left and right sides in the width direction of the upper opening portion 31 or the lower opening portion 41, and the density of the fibers constituting the absorber is relatively low. The high-density region 72 refers to a region on the left and right outer sides in the width direction of the low-density region 71, and the density of the fibers constituting the absorber is relatively high.

According to the above configuration, the high-density region 72 is formed on the outer side in the width direction of the upper layer absorber 30 or the lower layer absorber 40, so that the shape retaining properties of the absorbers 30 and 40 are improved. Therefore, even if the upper absorbent body 30 or the lower absorbent core 40 is stacked, the positions of the respective absorbent bodies 30 and 40 can be hardly shifted. Further, when worn, the absorbent body is compressed between the wearer's feet and is moved further in the front-rear direction. However, by improving the shape retaining property of the absorbent body, it is difficult to cause the mat to be broken. However, when the fiber density of the entire absorbers 30 and 40 is increased, the absorption capacity or the liquid diffusibility of the absorbers 30 and 40 is lowered. Therefore, in a preferred embodiment of the present invention, the fiber density of the upper layer absorber 30 or the lower layer absorber 40 is lowered in the vicinity of the center in the width direction in which the upper opening 31 or the lower opening 41 is formed, and the absorption capacity is maintained or Liquid diffusibility. Thereby, the absorption performance and the shape retention property of the upper layer absorber 30 and the lower layer absorber 40 can coexist.

According to the present invention, in the absorbent article having the plurality of layers of the absorbent body in which the opening portion is formed, the absorption capacity, liquid diffusibility, and collection ability of the respective layers of the absorbent body can be effectively utilized.

1‧‧‧Predecessor

2‧‧‧ Back body

3‧‧ ‧ Department

10‧‧‧Top film

20‧‧‧ Back film

30‧‧‧Upper absorber

31‧‧‧Upper opening

32‧‧‧Extension

40‧‧‧lower absorber/first lower absorber

41‧‧‧Bottom opening/first lower opening

42‧‧‧ Opening through section

43‧‧‧ Wide section

44‧‧‧Gifts

45‧‧‧ Branch

50‧‧‧SAP layer

61‧‧‧First diffuser

62‧‧‧Second diffusion film

63‧‧‧ Third diffuser/liquid diffuser

64‧‧‧fourth diffusion film

65‧‧‧ fifth diffuser

71‧‧‧Low-density area

72‧‧‧High-density area

80‧‧‧Second lower absorber

81‧‧‧Second lower opening

90‧‧‧Second SAP layer

100‧‧‧Absorbables

Fig. 1 is a view showing absorption of a first embodiment of the first invention Top view of sexual items.

Fig. 2 is a cross-sectional view taken along the line X1-X1 shown in Fig. 1.

Fig. 3 is a plan view showing an absorbent article according to a second embodiment of the first invention.

Fig. 4 is a cross-sectional view taken along the line X2-X2 shown in Fig. 3.

Fig. 5 is a cross-sectional view showing an absorbent article according to a third embodiment of the first invention.

Fig. 6 is a plan view showing an absorbent article according to a first embodiment of the second invention.

Fig. 7 is a cross-sectional view taken along the line X3-X3 shown in Fig. 6.

Fig. 8 is a plan view showing an absorbent article according to a second embodiment of the second invention.

Fig. 9 is a plan view showing an absorbent article according to a third embodiment of the second invention.

Fig. 10 is a cross-sectional view taken along the line X4-X4 shown in Fig. 9.

Hereinafter, the form used in the present invention will be described using the drawings. The present invention is not limited to the embodiments described below, and includes those skilled in the art who are appropriately changed from the following aspects.

In the present specification, the term "A~B" means "A or more B or less".

In addition, in the present specification, the "longitudinal direction" means a direction in which the front body on the abdomen side of the wearer and the back body on the back side of the wearer are connected to each other in the absorbent article. Further, the "width direction" means a direction orthogonal to the plane of the longitudinal direction of the absorbent article. In the figure of the present invention, the longitudinal direction of the absorbent article is represented by the Y axis, and the width direction of the absorbent article is represented by the X axis.

In addition, in the present specification, the so-called "skin opposite" means When wearing an absorbent article, it faces the wearer's skin. In addition, the term "skin non-opposite surface" means that when the absorbent article is worn, it does not face the wearer's skin.

[1. Regarding the first invention]

[1-1. First Embodiment]

First, a first embodiment of the absorbent article 100 according to the first aspect of the invention will be described with reference to Figs. 1 and 2 . Fig. 1 is a plan view showing an absorbent article 100 according to the first embodiment. In addition, FIG. 2 is a cross-sectional view schematically showing a cross-sectional structure of the absorbent article 100 on the line X1-X1 shown in FIG. 1 . In the cross-sectional view of Fig. 2, in order to easily show the structure of the absorbent article 100, a gap is formed between the various constituent members, but substantially no gap is formed between the constituent members.

The absorbent article 100 of the present embodiment relates to an absorbent pad. The absorbent pad may be used singly or in the inner side of the pant-type or belt-type disposable diaper. As shown in Fig. 1, the absorbent article 100 can be divided into a front body 1 on the abdomen side of the wearer, a back body 2 on the back side of the wearer, and a lower portion 3 between the front and back bodies of the front body. . Specifically, the absorbent article 100 can be expressed in the shape of a gourd type or an hourglass type in plan view. In other words, the absorbent article 100 is a narrowed portion of the absorbent article 100, that is, a constricted portion, which is present in the lower stage portion 3. On the other hand, in the front body 1 and the back body 2 of the absorbent article 100, a side flap is present, and the side flap is a portion extending further to the left and right outside in the width direction than the constricted portion of the lower stage 3. That is, in the portion where the side flap is formed, the widths of the front body 1 and the back body 2 are formed wider than the width of the constricted portion of the lower stage portion 3. As such, the absorbent article 100 can be formed into a gourd type (hourglass type). However, the shape of the absorbent article 100 may be changed as appropriate, or may be formed, for example, in a simple rectangular shape.

Further, as shown in FIGS. 1 and 2, the absorbent article 100 has substantially a liquid-permeable topsheet 10, a liquid-impermeable backsheet 20, and a plurality of sheets between the topsheet backsheets. Absorbers 30, 40. As shown in the cross-sectional view of Fig. 2, a plurality of absorbers 30, 40 overlap in the thickness direction. Further, the top sheet 10 covers the skin facing side of the laminated absorbent bodies 30, 40, and the back sheet 20 covers the skin non-opposing side of the laminated absorbent bodies 30, 40. As shown in Figs. 1 and 2, the topsheet 10 and the backsheet 20 are joined to each other around the absorbers 30, 40. Thereby, the absorbers 30 and 40 are surrounded by the joint portion of the top sheet 10 and the back sheet 20.

The topsheet 10 is a skin member that directly contacts the wearer's lower mouth and allows liquid such as urine to penetrate the absorbent bodies 30, 40. Therefore, the top sheet 10 is made of a highly liquid permeable material. The liquid permeable material constituting the top sheet 10 is, for example, a woven fabric, a non-woven fabric, or a porous film. Further, a material obtained by hydrophilizing a fiber of a thermoplastic resin such as polypropylene or polyethylene, polyester, or nylon may be used to form a nonwoven fabric. Examples of the non-woven fabric include a breathable nonwoven fabric, a non-woven fabric, a spunbond nonwoven fabric, and a melt blown nonwoven fabric.

The back sheet 20 is a sheet-like member for preventing the liquid absorbed by the absorbers 30, 40 from leaking out to the outside of the diaper by penetrating the top sheet 10. Therefore, the back sheet 20 is formed of a liquid-impermeable material. The liquid-impermeable material constituting the back sheet 20 is, for example, a liquid-impermeable film made of a polyethylene resin. In particular, in order to ensure air permeability while maintaining the liquid impermeability of the back sheet 20, it is preferable to use a fine porous polyethylene film in which a plurality of fine pores of 0.1 to 4 μm are formed.

The absorbers 30 and 40 are members for absorbing liquid such as urine and for holding a liquid for absorption. The absorbers 30 and 40 are disposed between the liquid permeable topsheet 10 and the liquid-impermeable back sheet 20. The absorbent article 100 of the present embodiment includes two absorbers of the upper layer absorber 30 on the top sheet 10 side and the lower layer absorber 40 on the side of the back sheet 20. Upper layer absorption The body 30 and the lower layer absorbent body 40 can each be composed of a well-known absorbent material. As the absorbent material, for example, a fluff pulp or a super absorbent polymer (SAP) or a hydrophilic sheet obtained by fragmenting a fibrous material such as a coniferous tree can be used. In addition, the absorbent material, the fluff pulp, the superabsorbent polymer, or the hydrophilic sheet may be used alone or in combination of two or more.

In the present embodiment, the upper layer absorber 30 is a structure in which a combination of fluff pulp and a superabsorbent polymer is used, and a plurality of granular superabsorbent polymers are supported by fluff pulp. On the other hand, the lower absorbent body 40 is composed only of fluff pulp, and no superabsorbent polymer is distributed. Thus, among the plurality of absorbent bodies, at least the upper absorbent body 30 located at a position close to the wearer's skin contains a super absorbent polymer and the lower absorbent core 40 containing the superabsorbent polymer is preferably a preferred embodiment of the present invention. form. Since the upper absorbent core 30 contains a highly water-absorptive polymer, the upper absorbent core 30 can quickly absorb liquid such as urine, so that the surface of the absorbent article 100 is dry, and the wearer's uncomfortable feeling can be avoided. On the other hand, in the case of the lower absorbent body 40, the liquid which the upper absorbent body 30 cannot perform absorption can be absorbed. At this time, instead of providing the superabsorbent polymer on the lower layer absorber 40 to increase the absorption speed, it is better to absorb the liquid in a wide range of the lower layer absorber 40 without providing the superabsorbent polymer, thereby increasing the absorption amount of the liquid. This is more effective. Therefore, in the present embodiment, the superabsorbent polymer is dispersed only in the upper absorbent core 30, and it is not necessary to disperse the superabsorbent polymer in the lower absorbent core 40.

As shown in FIGS. 1 and 2, in the present invention, the upper opening portion 31 is formed in the upper layer absorber 30. The upper opening portion 31 is a hole (slit) that penetrates the thickness direction of the upper layer absorber 30. The upper opening portion 31 forms a portion of the upper absorbent body 30 that is most likely to directly contact the urine excreted by the wearer. Specifically, as shown in FIG. 1, the upper opening portion 31 is formed in the lower stage portion 3. For example, the upper side opening portion 31 can A part formed in the lower stage portion 3 may be formed to extend beyond the lower stage portion 3 to either or both of the front body 1 and the back body 2. Further, the upper opening portion 31 is preferably located at a central portion in the width direction of the lower stage portion 3. For example, when the lower stage 3 is equally divided into three regions of the left portion, the central portion, and the right portion in the width direction, the upper opening portion 31 is preferably located at the central portion of the lower portion 3.

As described above, by forming the upper opening portion 31 in the lower stage portion 3 of the upper layer absorbent body 30, urine excreted by the wearer is diffused in the longitudinal direction along the upper side opening portion 31. Further, by forming the upper opening portion 31, the surface area of the upper layer absorber 30 is increased, so that liquid such as urine can be quickly absorbed. Further, liquid such as urine excreted on the upper absorbent body 30 can be guided to the lower absorbent body 40 through the upper opening 31. Thereby, both the upper layer absorber 30 and the lower layer absorber 40 can absorb liquid efficiently.

As shown in FIGS. 1 and 2, the upper opening portion 31 has a predetermined length L1 (maximum value) and a predetermined width W1 (maximum value). The length L1 of the upper opening 31 and the width W1 may be appropriately adjusted in accordance with the size of the absorbent article 100. For example, when the absorbent article 100 is an absorbent pad for an adult, the length L1 of the upper opening 31 may be set to 100 mm to 300 mm or 150 mm to 250 mm. Further, the width W1 of the upper opening portion 31 is set to be at least shorter than the length L1, for example, 5 mm to 35 mm or 10 mm to 30 mm. In this way, the upper opening portion 31 has a long shape in the longitudinal direction. In the example shown in Fig. 1, the upper opening portion 31 has a rectangular shape extending in the longitudinal direction. However, the shape of the upper opening portion 31 is not limited to the one shown in the drawings, and various shapes such as a triangle or a pentagon, another polygonal shape, and a circular shape may be employed.

Further, as shown in FIGS. 1 and 2, in the present invention, the lower opening portion 41 is formed in the lower layer absorber 40. The lower opening portion 41 is a hole (slit) that penetrates the thickness direction of the lower layer absorber 40. Lower side The opening portion 41 has a predetermined length L2 (maximum value) and a predetermined width W2 (maximum value). Here, as shown in the figure, the length L2 and the width W2 of the lower opening portion 41 of the lower layer absorber 40 are shorter than the length L1 and the width W1 of the upper opening portion 31 of the upper layer absorber 30, respectively (L2 < L1, W2 < W1 ). For example, the length L2 of the lower opening portion 41 is preferably 40% to 95% or 50% to 90% of the length L1 of the upper opening portion 31. Further, the width W2 of the lower opening portion 41 is preferably 30% to 95% or 40% to 90% of the width W1 of the upper opening portion 31. As described above, since the length and width of the lower opening portion 41 are shorter than the length and width of the upper opening portion 31, the opening area of the lower opening portion 41 is substantially smaller than the opening area of the upper opening portion 31. As shown in Fig. 1, the shape of the lower opening portion 41 is preferably a rectangular shape similar to the upper opening portion 31. However, the shape of the lower opening portion 41 may not be similar to that of the upper opening portion 31, and various shapes such as a triangle or a pentagon, other polygonal shapes, and a circular shape may be employed.

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

As described above, by connecting the upper opening 31 of the upper absorbent body 30 and the lower opening 41 of the lower absorbent body 40, the liquid discharged by the wearer is guided to the lower opening 41 through the upper opening 31, so that The liquid is absorbed in a wide range of the respective absorbent bodies 30, 40. In addition, if the absorbent article 100 is worn in the lower gear of the wearer, it is necessary to think about each The absorbers 30, 40 are compressed in the width direction. In this case, the upper opening 31 is formed larger than the lower opening 41, and the upper opening 31 can be maintained even when the respective absorbers 30 and 40 are compressed in the width direction and the lower opening 41 is blocked. Space. Thereby, when the absorbent article is worn, the liquid such as urine can be guided to the lower absorbent body 40 through the upper opening 31, and the absorption capacity of the absorbent article can be improved. Further, since the liquid such as urine is diffused along the upper opening portion 31 of the upper layer absorbent body 30 and the lower opening portion 41 of the lower layer absorbent body 40, the liquid diffusibility of the entire absorbent article can be improved. In addition, the lower opening portion 41 of the lower layer absorber 40 is provided smaller than the upper opening portion 31 of the upper layer absorber 30, and the liquid that has passed through the upper opening portion 31 is easily collected by the lower layer absorber 40.

As shown in Fig. 1 and Fig. 2, in the present embodiment, the shape 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 an hourglass type, and the lower layer absorber 40 is formed into a rectangular shape. In this manner, the shape of the upper layer absorber 30 and the lower layer absorber 40 may be different. In particular, when the upper layer absorber 30 has the extending portion 32 and the extending portion 32 is superposed on the lower layer absorber 40, the front body 1 and the back body 2 are expanded outward in the width direction from the lower layer absorber 40. Therefore, in the present embodiment, the portion of the upper layer absorbent body 30 where only the extending portion 32 is formed is larger than the lower layer absorbent body 40. As described above, by increasing the size of the upper absorbent body 30, when urine or the like is excreted, it can be quickly absorbed in a wide range of the upper absorbent body 30, thereby preventing leakage of urine. In addition, the lower layer absorber 40 disposed under the upper layer absorber 30 may be formed into a gourd type in the same manner as the upper layer absorber 30. However, the wearing feeling of the absorbent article 100 is lowered, which is not preferable. Therefore, according to the present embodiment, the shape of the lower absorbent core 40 is smaller than the rectangular shape of the upper absorbent core 30, so that the absorption amount of the entire absorbent article 100 can be increased, and the wearing feeling can be favorably maintained.

As shown in the cross-sectional view of Fig. 2, the present embodiment is The absorbent article 100 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. Further, 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 formed of a single member, and are integrally coupled to each other so as to surround the lower layer absorber 40. As described above, each of the diffusion sheets 61 to 63 may be composed of a separate sheet member or may be composed of a connected sheet member.

The first diffusion sheet 61, the second diffusion sheet 62, and the third diffusion sheet 63 are sheet-like members having liquid diffusion properties that absorb liquid and diffuse liquid. Each of the diffusion sheets 61 to 63 may be a thin paper such as a tissue paper or a non-woven fabric. Examples of the non-woven fabric include a breathable nonwoven fabric, a non-woven fabric, a spunbond nonwoven fabric, and a melt blown nonwoven fabric.

As shown in FIG. 2, the first diffusion sheet 61 covers the upper opening portion 31 of the upper layer absorbent body 30 from the skin facing surface side. Further, the second diffusion sheet 62 covers the upper opening portion 31 of the upper layer absorbent body 30 from the skin non-opposing surface side, and covers the lower side opening portion 41 of the lower layer absorbent body 40 from the skin facing surface side. Further, the third diffusion sheet 63 covers the lower opening portion 41 of the lower layer absorber 40 from the skin non-opposing surface side. By including the respective opening portions 31 and 41, the respective absorbent bodies 30 and 40 are covered by the liquid diffusing sheet member, and the liquid flowing into the openings 31 and 41 can be effectively diffused. Thereby, the liquid can be absorbed in a wide range of the two absorbent bodies 30, 40, so that the absorption capacities of the two absorbent bodies 30, 40 can be effectively utilized. In particular, it is difficult for the liquid to penetrate into the gap between the upper absorbent body 30 and the lower absorbent core 40. Then, by providing the second diffusion sheet 62 in the gap between the upper layer absorber 30 and the lower layer absorber 40, the liquid can also permeate into the region of the gap between the upper layer absorber 30 and the lower layer absorber 40 which are generally considered to be difficult to absorb the liquid.

As shown in the cross-sectional view of Fig. 2, the absorbent article 100 of the present embodiment further has an SAP layer 50. This 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 agglomeration of 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 with the upper absorber 30 and the lower absorber 40. For the highly water-absorptive polymer (SAP), a well-known material can be used. For example, the superabsorbent polymer absorbs liquids in an amount of from 100 to 1000 times the weight of the body. The superabsorbent polymer may be, for example, a diameter of about 0.1 mm to 0.5 mm in a dry state before absorbing the liquid.

As described above, by providing the SAP layer 50 between the upper layer absorber 30 and the lower layer absorber 40, the SAP layer 50 can be quickly absorbed by the second diffusion sheet 62 between the upper layer absorber 30 and the lower layer absorber 40. liquid. Therefore, the liquid that has flowed into the upper opening portion 31 of the upper layer absorbent body 30 can be surely 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 absorbent body 30 or the upper opening portion 31, the liquid can be prevented from leaking to the outside. Further, 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 in volume, it is difficult to transmit the touch to the wearer. Therefore, it is possible to provide a wearer with a good wearing feeling before and after excretion of the liquid.

Further, the SAP layer 50 is formed at least on the left and right sides in the width direction of the lower opening portion 41. In particular, the SAP layer 50 is preferably formed on the right and left sides in the width direction of the lower opening portion 41 and the left and right sides in the width direction of the upper opening portion 31. As described above, by providing the SAP layer 50 in a range that does not overlap both the upper opening portion 31 and the lower opening portion 41, the upper layer absorber 30 and the lower layer absorber 40 can be completely sandwiched. SAP layer 50. Therefore, even if the wearer's movement of the absorbent article is large, the superabsorbent polymer constituting the SAP layer 50 can be prevented from falling into the upper opening portion 31 or the lower opening portion 41. When the superabsorbent polymer falls into the openings 31 and 41, the polymer occludes the opening portions 31 and 41 when the liquid is absorbed, or the touch of the highly water-absorptive polymer is transmitted to the wearer. . 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 falling into the openings 31 and 41. Further, although not shown in the drawings, the SAP layer 50 may be formed on the front and rear sides in the longitudinal direction of the upper opening portion 31 or the lower opening portion 41.

Further, as shown in Fig. 2, the SAP layer 50 is preferably 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. In particular, in the present embodiment, the lower layer absorber 40 is sealed inside the one member in which the second diffusion sheet 62 and the third diffusion sheet 63 are joined. In this case, it is preferable that the SAP layer 50 and the lower layer absorber 40 are collectively enclosed in one member composed of the second diffusion sheet 62 and the third diffusion sheet 63. Thereby, even if the super absorbent polymer constituting the SAP layer 50 falls into the lower opening portion 41 of the lower layer absorbent body 40, it is possible to prevent the superabsorbent polymer from being scattered around. Further, by forming the SAP layer 50 under the second diffusion sheet 62, the liquid permeating the second diffusion sheet 62 easily moves to the SAP layer 50, so that the SAP layer 50 can be more effectively absorbed by the liquid.

Further, as shown in Fig. 2, in the present embodiment, the second diffusion sheet 62 located between the upper layer absorber 30 and the lower layer absorber 40 is partially overlapped in two layers. In this case, it is preferable that the overlapping portion of the second diffusion sheet 62 covers the skin non-opposing surface side of the upper opening portion 31 and the skin facing surface side of the lower opening portion 41. As described above, the second diffusion sheet 62 is partially heavy by the portion where the upper opening portion 31 and the lower opening portion 41 are formed. The stacking is thick, and the liquid flowing into the respective opening portions 31, 41 can be more effectively diffused.

[1-2. Second embodiment]

Next, a second embodiment of the absorbent article 100 according to the first aspect of the invention will be described with reference to Figs. 3 and 4 . In the second embodiment, the same configurations as those of the above-described first embodiment will be omitted, and the structure different from the first embodiment will be mainly described. Fig. 3 is a plan view showing the absorbent article 100 in the same manner as Fig. 1 . In addition, in the same manner as in the second drawing, Fig. 4 shows a cross-sectional view taken along the line X2-X2 shown in Fig. 3. As shown in FIG. 3 and FIG. 4, the absorbent article 100 according to the second embodiment has the low-density region 71 and the high-density region 72 in the upper absorbent core 30 and the lower absorbent core 40, and the first embodiment described above. different.

As shown in FIGS. 3 and 4, among the upper layer absorber 30 and the lower layer absorber 40, at least the lower stage portion 3 is formed with a low-density region 71, and a region other than the low-density region 71 is a high-density region 72. The low-density region 71 is a region in which the density of the fibers constituting each of the absorbers 30 and 40 is lower than that of the high-density region 72. Further, the high-density region 72 is a region in which the density of the fibers constituting each of the absorbers 30 and 40 is higher than that of the low-density region 71.

Specifically, in the present embodiment, the low-density region 71 is formed at the central portion in the width direction of each of the absorbers 30 and 40. Further, the low-density region 71 is formed so as to extend over the entire longitudinal direction of each of the absorbers 30 and 40, centering on the lower portion 3 and reaching the front body 1 and the back body 2. In this manner, the low-density region 71 is formed at least in the central portion in the width direction of the lower stage portion 3. Further, an upper opening portion 31 is formed in the low-density region 71 of the upper layer absorber 30, and a lower opening portion 41 is formed in the low-density region 71 of the lower layer absorber 40.

Thus, in a preferred embodiment of the present invention, a low-density region is formed in a central portion in the width direction of each of the absorbers 30, 40. 71. Each of the openings 31 and 41 is 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 of the absorbers 30 and 40. Further, 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, a region other than the low-density region 71 becomes the high-density region 72. In the present embodiment, the high-density regions 72 are formed on the left and right sides in the width direction of the low-density region 71, and are divided into two regions via the low-density region 71. That is, the left and right high-density regions 72 are formed over the entire longitudinal direction of each of the absorbers 30 and 40, respectively. In the present embodiment, the upper opening portion 31 of the upper layer absorber 30 and the lower opening portion 41 of the lower layer absorber 40 are formed only in the low-density region 71, and are not formed in the high-density region 72. However, each of the openings 31 and 41 may be formed over both the low-density region 71 and the high-density region 72.

The high density region 72 can be formed by, for example, pressing the upper absorbent body 30 and the lower absorbent body 40. As the extrusion of each of the absorbers 30, 40, a pressing device such as a known press roll can be used. As described above, the thickness of each of the absorbers 30 and 40 is reduced by pressing the respective absorbers 30 and 40. Therefore, the density of the fibers constituting each of the absorbers 30 and 40 is increased. Thereby, among the respective absorbers 30, 40, the pressed region (or the strongly pressed region) becomes the high-density region 72, and the uncompressed region (or the weakly pressed region) becomes low. Density area 71.

Further, as shown in Fig. 4, in the present embodiment, the positions of the low-density region 71 and the high-density region 72 of the upper layer absorber 30 and the low-density region 71 and the high-density region 72 in which the lower layer absorber 40 is formed are formed. The location is best consistent. That is, the low-density region 71 of the upper layer absorber 30 and the low-density region 71 of the lower layer absorber 40 overlap in the thickness direction, and the high-density region 72 of the upper layer absorber 30 and the high-density region 72 of the lower layer absorber 40 are in the thickness direction. Overlap. In order to In this manner, for example, after the upper layer absorber 30 and the lower layer absorber 40 are overlapped, it is more efficient to simultaneously press the absorbers 30 and 40 to form the high-density region 72 and the low-density region 71.

As described above, by forming the high-density region 72 on the upper layer absorbent body 30 and the lower layer absorber 40, the shape retaining properties of the respective absorbers 30 and 40 can be improved, and the respective absorbers 30 and 40 are hardly deformed even when worn. In particular, according to the present embodiment, since the high-density region 72 is formed on the left and right sides of the low-density region 71, even when the respective absorbers 30, 40 are compressed in the width direction, the upper opening formed in the low-density region 71 is formed. The portion 31 and the lower opening portion 41 are also less likely to be clogged. Thereby, even when wearing, the absorption capacity and liquid diffusibility of each of the absorbers 30 and 40 can be maintained.

Further, in the present invention, the upper layer absorber 30 and the lower layer absorber 40 are overlapped. In this case, by arranging the high-density regions 72 so that the respective absorbers 30 and 40 are overlapped, it is possible to prevent the positions of the respective absorbers 30 and 40 from shifting during wearing. In particular, in the present embodiment, after the upper layer absorber 30 and the lower layer absorber 40 are overlapped, the respective absorbers 30 and 40 are simultaneously pressed to form the high-density region 72. As a result, since the high-density regions 72 of the respective absorbers 30 and 40 are more encrypted, the positional displacement between the layers of the respective absorbers 30 and 40 can be effectively prevented.

In the example shown in Fig. 4, the thickness of the low-density region 71 of the upper layer absorber 30 is indicated by the symbol T1, and the thickness of the high-density region 72 of the upper layer absorber 30 is indicated by the 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%, particularly preferably 10% to 50%, for the thickness T1 of the low-density region 71. For example, the thickness of the low-density region 71 may be set to 10 mm to 20 mm. Further, the thickness of the high-density region 72 is set to 5 mm to 15 mm, which is thinner than the low-density region 71. Furthermore, the relationship between the low-density region 71 of the lower layer absorber 40 and the thickness of the high-density region 72 may also be as described above. The low density region 71 of the upper layer absorber 30 is the same as the high density region 72.

Further, in the upper layer absorber 30, the density of the fibers constituting the low-density region 71 is preferably 10% to 90%, particularly preferably 10% to 50%, for the density of the fibers constituting the high-density region 72. Further, when the density of the low-density region 71 and the high-density region 72 is compared, a test piece of the same-volume low-density region 71 and the high-density region 72 is prepared, and the weight of each test piece may be compared. Therefore, the unit of density becomes 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 preferably 20 to 150 mg/cm ³ , which is a range higher than the density of the low-density region 71. Further, the relationship between the low-density region 71 of the lower layer absorber 40 and the density of the high-density region 72 may 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.

Further, in the upper layer absorbent body 30, the width B1 of the low-density region 71 is preferably, for example, 20% to 80% or 30% to 70% of the total width (maximum value) of the upper layer absorbent body 30. Further, a region other than the low-density region 71 of the upper layer absorber 30 is a high-density region 72. Further, the width of the low-density region 71 of the lower layer absorber 40 is preferably made to coincide with the width of the low-density region 71 of the upper layer absorber 30. Further, a region other than the low-density region 71 of the lower layer absorber 40 is a high-density region 72.

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

Further, 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, but the low-density region 71 and the high-density region 72 may be formed only in Any of the upper layer absorber 30 and the lower layer absorber 40. Further, 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. Further, the low-density region 71 may be formed at least in the lower stage portion 3, or may not be formed on the front body 1 or the back body 2.

[1-3. Third embodiment]

Next, a third embodiment of the absorbent article 100 according to the first aspect of the invention will be described with reference to Fig. 5. In the third embodiment, the same configurations as those in the first embodiment will be omitted, and the structure different from the first embodiment will be mainly described. Fig. 5 is a cross-sectional view showing the absorbent article 100 in the same manner as Fig. 2 . As shown in Fig. 5, the absorbent article 100 according to the third embodiment further includes a second lower absorbent body 80 in addition to the upper absorbent core 30 and the lower absorbent core 40.

In the third embodiment shown in Fig. 5, the absorbent article 100 may have a structure in which three or more absorbent members are interposed between the topsheet 10 and the backsheet 20. In other words, the absorbent article 100 according to the third embodiment includes the second lower absorbent body 80 below the upper absorbent core 40 and the lower absorbent core 40 (on the skin non-opposing surface side). In addition, the absorber located between the upper layer absorber 30 and the second lower layer absorber 80 is hereinafter referred to as a first lower layer absorber 40. Further, the opening formed on the first lower layer absorber 40 is referred to as a first lower opening portion 41.

The second lower layer absorber 80 can be formed substantially in 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 the second lower opening portion 81 at the central portion in the width direction. In this case, the second lower opening portion 81 of the second lower layer absorber 80 preferably has a longer length and a width than the upper layer absorber. The upper opening portion 31 of the 30 or the first lower opening portion 41 of the first lower layer absorber 40 is short. That is, it is preferable that the length and the width thereof are narrowed in the order of the upper opening portion 31, the first lower opening portion 41, and the second lower opening portion 81.

Further, 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 one member, and the second lower layer absorber 80 is wrapped. 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 a thin paper such as a face paper, or may be 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 agglomeration of 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 portion 81 of the second lower layer absorber 80. In particular, the second SAP layer 90 is preferably formed on the outer side in the width direction of the second lower opening portion 81 of the second lower layer absorber 80 and on the outer side in the width direction of the first lower opening portion 41 of the first lower layer absorber 40. Area. Thereby, the second lower layer absorber 90 can be sandwiched between the first lower layer absorber 80 and the second lower layer absorber 80, and the dispersion of the superabsorbent polymer constituting the second SAP layer 90 can be prevented.

As described above, the absorbent article 100 of the present invention can be formed in a structure in which the absorbent body is deposited in three or more layers. Further, although not shown in the drawings, the absorber may be laminated in four or more layers or five or more layers.

[2. Second invention]

Next, an absorbent article according to a second invention will be described with reference to Figs. 6 to 10 . Furthermore, in the description of the second invention, The same configurations as those of the first invention described above are denoted by the same reference numerals. In the description of the second invention, the description of the first invention and the configuration will be referred to, and the overlapping description will be omitted.

In order to prevent the absorbed liquid from returning, the general absorbent body disperses the superabsorbent polymer (SAP) in the absorbent body or locally. However, SAP has a property that the absorption rate of the liquid is slow and the liquid becomes gel-like to form a so-called gel block, so that it has difficulty in syneresis and cannot be repeatedly absorbed. Therefore, for example, when SAP is placed at a high density on the skin facing side of the absorbent body, when a large amount of urination occurs at a time, the rate of leakage of SAP is slow and there is a possibility of leakage of urine. In addition, when repeated urination occurs, the amount of absorption is lowered due to gelation of SAP, and there is a possibility of leakage of urine. On the other hand, the SAP is disposed on the non-opposing side of the skin of the absorbent body, and the liquid may not reach the SAP. Therefore, the absorbent body located on the opposite side of the skin contains a lot of water and is swollen from the SAP. The absorber produces a helium back to the liquid.

Accordingly, the second invention provides an absorbent article which is highly diffusible in liquid, can effectively absorb urine by using SAP, and can prevent leakage of urine or urine even when there is a large amount of urination or repeated urination at once.

In the second aspect of the invention, the inventors provided an SAP layer in which SAP is dense between a plurality of absorbers, and an opening is formed in each of the absorbers, and the SAP layer is disposed on both sides in the width direction of a portion where the openings overlap. As described above, by disposing the SAP layer on both sides of the opening portion, the discharged liquid is diffused by the opening portion and is effectively absorbed by the SAP layer. In addition, by disposing the SAP layer between the plurality of absorbers, a large amount of liquid can be prevented from coming into contact with the SAP layer at once, so that the liquid can be effectively infiltrated into the SAP layer having a slow absorption rate, thereby preventing leakage of urine or urine. .

The absorbent article according to the second aspect of the invention includes: a liquid permeable topsheet 10 which is located on the opposite side of the skin; and a liquid-impermeable back sheet 20 which Located on the non-opposite side of the skin; and a plurality of absorbers interposed between the topsheet 10 and the backsheet 20 to overlap in the thickness direction. Further, 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 on the side of the top sheet 10; and an lower layer absorber 40 on the side of the back sheet 20. The upper layer absorber 30 has an upper opening portion 31, and the lower layer absorber 40 has a lower opening portion 41. The lower opening portion 41 extends in the longitudinal direction of the absorbent article and at least partially overlaps the upper opening portion 31.

The absorbent article of the present invention further includes an SAP layer 50 formed by disposing a plurality of superabsorbent polymers SAP between the upper absorbent body 30 and the lower absorbent core 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 in which the upper opening portion 31 and the lower opening portion 41 overlap.

According to the above configuration, the upper opening portion 31 and the lower opening portion 41 are formed in the respective absorbers of the upper layer absorbent body 30 and the lower layer absorbent body 40, and the excreted urine can be dispersed in the absorbent article through the openings. The length direction. Further, by forming the SAP layer 50 on both sides of the opening penetrating portion 42 overlapping at least the upper opening portion 31 and the lower opening portion 41, the SAP layer 50 can effectively absorb the liquid diffused by the opening portion. Thereby, even when a large amount of urination is performed at a time, the liquid spreads over a wide range of the SAP layer 50 and is absorbed, so that leakage of urine 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 permeating the upper layer absorber 30 or the liquid permeating the lower layer absorber 40 can be transferred to the SAP layer 50. Thereby, the SAP layer 50 absorbing the liquid swells and swells and gels, and it is difficult to dehydrate and shrink the liquid, so that the return of the liquid can be prevented. Further, since a large amount of liquid can be prevented from locally contacting the SAP layer 50 at once, even if the SAP layer 50 having a slow liquid absorption rate can absorb a large amount of liquid in a wide range, it is possible to prevent leakage of urine. In addition, even if you repeat In the case of urination, the liquid can be effectively 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 expands in volume, it is difficult to transmit the touch to the wearer, resulting in a decrease in discomfort. Further, in the present invention, since the liquid is easily diffused in the longitudinal direction along the lower opening portion 41, and the SAP layer 50 is formed on the left and right sides of the lower opening portion 41 in the width direction, the width from the width can be particularly effectively prevented. Leakage in the direction.

In the second invention, the opening penetrating portion 42 is preferably formed on the ventral side of the wearer than the center in the longitudinal direction.

According to the above configuration, by forming the opening penetrating portion 42 at the position of the front body where the excreted urine is initially easily contacted, it is easy to guide the urine to the upper opening portion 31 and the lower opening portion 41.

In the second aspect of the invention, the lower opening portion 41 is preferably longer in the longitudinal direction than the upper opening portion 31. In other words, the lower opening portion 41 preferably has either or both of a portion extending on the back body side in the longitudinal direction and a portion extending on the front body side in the longitudinal direction than the upper opening portion 31.

According to the above configuration, by forming the lower opening portion 41 longer than the upper opening portion 31, the liquid that has flowed into the lower opening portion 41 through the opening penetrating portion 42 can be sealed to the skin non-orientation surface of the upper layer absorbent body 30. Side, so it is more effective to prevent the return of liquid. Further, when the liquid is once closed in the lower opening portion 41, even if the SAP layer 50 located on the left and right sides thereof takes a long time to absorb, the liquid does not leak or return. Therefore, the SAP layer 50 having a slow absorption speed can be utilized to effectively absorb the liquid.

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

According to the above configuration, the lower opening portion 41 is opened from the upper side. The mouth portion 31 is wider or partially wider, and the liquid is easily diffused in the width direction by the lower opening portion 41, and the total amount of liquid that can be stored in the lower opening portion 41 is increased. Thereby, the liquid can be transferred to the SAP layer 50 through the lower opening portion 41 over a wide range in the width direction.

In the second aspect of the invention, the liquid diffusion sheet 63 is preferably disposed between the lower layer absorber 40 and the SAP layer 50 in a region covering the lower opening portion 41. In this case, the SAP layer 50 may be formed at a position overlapping the lower side opening portion 41 at least partially in the thickness direction. As described above, when the SAP layer 50 is placed on the liquid-diffusing sheet 63, even if the SAP layer 50 overlaps with the lower opening portion 41, the SAP constituting the SAP layer 50 does not fall into the lower opening portion 41.

According to the above configuration, the liquid diffusion sheet 63 is disposed between the lower layer absorber 40 and the SAP layer 50, and the SAP layer 50 can be easily disposed even on the lower opening portion 41. Therefore, the configuration in which the lower opening portion 41 is located on the lower side of the SAP layer 50 can be realized. In this case, the diffusion effect and the absorption effect of the liquid can be further improved by the synergistic effect of the lower opening portion 41 and the SAP layer 50.

According to the second invention, it is possible to provide an absorbent article which is highly diffusible in liquid, can effectively absorb urine by using SAP, and can prevent leakage of urine or urine even if there is a large amount of urination or repeated urination at once. Return.

[2-1. First Embodiment]

A first embodiment of the absorbent article 100 according to the second aspect of the invention will be described with reference to Figs. 6 and 7. Fig. 6 is a plan view showing the absorbent article 100 according to the first embodiment. In addition, Fig. 7 is a cross-sectional view schematically showing a cross-sectional structure of the absorbent article 100 of the X3-X3 line shown in Fig. 6.

The absorbent article 100 of the present embodiment relates to an absorbent pad. The absorbent pad can be used alone or It is used on the inner side of the disposable diaper which is superimposed on the underwear type or the belt type. As shown in Fig. 6, the absorbent article 100 can be divided into a front body 1 on the abdomen side of the wearer, a back body 2 on the back side of the wearer, and a lower portion 3 between the front and back bodies of the front body. .

In addition, as shown in FIGS. 6 and 7, the absorbent article 100 has substantially a liquid permeable topsheet 10, a liquid impervious backsheet 20, and a plurality of the topsheet backsheets. Absorbers 30, 40. As shown in the cross-sectional view of Fig. 7, a plurality of absorbers 30, 40 are overlapped in the thickness direction. Further, the top sheet 10 covers the skin facing side of the laminated absorbent bodies 30, 40, and the back sheet 20 covers the skin non-opposing side of the laminated absorbent bodies 30, 40. As shown in Figs. 6 and 7, the topsheet 10 and the backsheet 20 are joined to each other around the absorbent bodies 30, 40. Thereby, the absorbent bodies 30, 40 are surrounded by the joint portion of the topsheet 10 and the backsheet 20. The absorbent article 100 of the present embodiment includes two absorbers of the upper layer absorber 30 on the top sheet 10 side and the lower layer absorber 40 on the side of the back sheet 20. The upper absorbent body 30 and the lower absorbent core 40 can each be composed of a well-known absorbent material.

In the present embodiment, the upper layer absorber 30 is a structure in which a combination of fluff pulp and a superabsorbent polymer is used, and a plurality of granular superabsorbent polymers are supported by fluff pulp. On the other hand, the lower absorbent body 40 is composed only of fluff pulp, and the super absorbent polymer is not distributed. Thus, among the plurality of absorbent bodies, at least the upper absorbent body 30 located at a position close to the wearer's skin contains a super absorbent polymer and the lower absorbent core 40 containing the superabsorbent polymer is preferably a preferred embodiment of the present invention. form. Since the upper absorbent core 30 contains a highly water-absorptive polymer, the upper absorbent core 30 can quickly absorb liquid such as urine, so that the surface of the absorbent article 100 is dry, and the wearer's uncomfortable feeling can be avoided. Further, in the case of the lower absorbent body 40, the liquid which the upper absorbent body 30 cannot fully absorb is absorbed. At this time, instead of providing a super absorbent polymer on the lower absorbent body 40, The high absorption rate is not as good as the absorption of the liquid in a wide range of the lower layer absorber 40 without providing the superabsorbent polymer, which is effective in improving the absorption amount of the liquid. Therefore, in the present embodiment, the superabsorbent polymer is dispersed only in the upper absorbent core 30, and the superabsorbent polymer 40 is not dispersed in the lower absorbent core 40.

As shown in FIGS. 6 and 7, in the present invention, the upper opening portion 31 is formed in the upper layer absorber 30. The upper opening portion 31 is a hole (slit) that penetrates the thickness direction of the upper layer absorber 30. The upper opening portion 31 is formed at least in a portion of the upper layer absorbent body 30 that is likely to directly contact the urine excreted by the wearer. Specifically, as shown in Fig. 6, when the upper layer opening portion 31 is divided into two regions in the longitudinal direction, the upper opening portion 31 is preferably formed in a region on the ventral side of the wearer. In particular, as shown in Fig. 6, the upper opening portion 31 is preferably formed at least partially on the front body 1 of the absorbent article 100. In the embodiment shown in Fig. 6, the upper opening portion 31 is formed from the front body 1 to the lower gear portion 3. Further, the upper opening portion 31 may be formed only in the front body 1 of the absorbent article 100, and may not be formed in the lower stage portion 3 or the back body portion 2. However, the position of the upper side opening portion 31 may be formed in the lower stage portion 3 or the back body 2, or may be formed from the length of the front body 1 through the lower stage portion 3 to the back body 2. Further, the upper opening portion 31 is preferably located at a central portion in the width direction. For example, when the upper absorbent body 30 is equally divided into three regions of the left portion, the central portion, and the right portion in the width direction, the upper opening portion 31 is preferably located at the central portion in the width direction.

As shown in FIGS. 6 and 7, the upper opening portion 31 has a predetermined length L1 (maximum value) and a predetermined width W1 (maximum value). The length L1 of the upper opening portion 31 and the width W1 may be appropriately adjusted in accordance with the size of the absorbent article 100. For example, when the absorbent article 100 is an absorbent pad for an adult, the length L1 of the upper opening 31 may be set to 10 mm to 100 mm or 20 mm to 60 mm. Further, the width W1 of the upper opening portion 31 is set to be at least shorter than the length L1, for example, 5 mm to 30 mm. Or 10mm~20mm. In this way, the upper opening portion 31 has a long shape in the longitudinal direction. In the example shown in Fig. 6, the upper opening portion 31 is formed in a rectangular shape extending in the longitudinal direction. However, the shape of the upper opening portion 31 is not limited to the one illustrated, and various shapes such as a triangle or a pentagon, other polygonal shapes, a circular shape, and an elliptical shape may be employed.

Further, as shown in FIGS. 6 and 7, in the present invention, the lower opening portion 41 is formed in the lower layer absorber 40. The lower opening portion 41 is a hole (slit) that penetrates the thickness direction of the lower layer absorber 40. As shown in FIG. 6, the lower opening portion 41 has a shape extending in the longitudinal direction, and is formed longer than the upper opening portion 31 in the longitudinal direction. Specifically, the lower opening portion 41 has a longer portion than the front end side in the longitudinal direction of the upper opening portion 31 and a longer portion than the rear end side of the upper opening portion 31 in the longitudinal direction. In the present embodiment, the lower opening portion 41 is formed to extend in the longitudinal direction from the length of the front body 1 over the lower stage portion 3 to the back body 2. Further, as shown in Fig. 6, the lower opening portion 41 partially has a wide portion 43, which is formed wider in the width direction than the upper opening portion 31.

Specifically, as shown in FIGS. 6 and 7, the lower opening portion 41 has a predetermined length L2 (maximum value) and a predetermined width W2 (maximum value). Here, as shown in the figure, the length L2 and the width W2 of the lower opening portion 41 of the lower layer absorber 40 are longer than the length L1 and the width W1 of the upper opening portion 31 of the upper layer absorber 30, respectively (L2>L1, W2>W1 ). For example, the length L2 of the lower opening portion 41 is preferably 150% to 500% or 200% to 400% with respect to the length L1 of the upper opening portion 31. Further, the width W2 of the lower opening portion 41 is preferably 110% to 300% or 150% to 200% with respect to the width W1 of the upper opening portion 31. As described above, since the length and width of the lower opening portion 41 are longer than the length and width of the upper opening portion 31, the opening area of the lower opening portion 41 is substantially larger than the opening area of the upper opening portion 31. As shown in Figure 6, basically the underside The shape of the opening portion 41 is preferably a rectangular shape, and the width of the wide portion 43 is partially enlarged. The portion of the wide portion 43 may be rectangular, may be other polygonal shapes, or may be formed in a circular or elliptical shape.

Further, the lower opening portion 41 of the lower layer absorber 40 is formed at a position at least partially overlapping the upper opening portion 31 of the upper layer absorber 30 in the thickness direction. In the present specification, a portion in which the upper opening portion 31 and the lower opening portion 41 are overlapped in the thickness direction is referred to as an opening penetrating portion 42. In the present embodiment, the length and width of the lower opening portion 41 are larger than the upper opening portion 31. In this case, it is preferable that the upper opening portion 31 is entirely overlapped with the lower opening portion 41. In this case, the entire upper opening portion 31 corresponds to the above-described opening through portion 42. Further, as described above, in the present embodiment, since the upper opening portion 31 of the upper layer absorber 30 is formed on the front body 1, the opening penetrating portion 42 in which the upper opening portion 31 and the lower opening portion 41 overlap each other is also formed on the front body 1. . However, the upper opening portion 31 may have a portion that does not overlap the lower opening portion 41. For example, when the area of the entire upper opening portion 31 is 100%, the upper opening portion 31 preferably overlaps the lower opening portion 41 by 50% to 100% or 90% to 100% of the area. As described above, by overlapping a part or all of the upper opening 31 and the lower opening 41, the two openings 31 and 41 communicate in the thickness direction.

As described above, by forming the upper opening portion 31 and the lower opening portion 41 in the upper layer absorber 30 and the lower layer absorber 40, the urine excreted by the wearer is diffused into the length through the upper opening portion 31 and the lower opening portion 41. direction. Specifically, since the lower opening portion 41 is formed longer in the longitudinal direction than the upper opening portion 31, the liquid that has flowed into the lower opening portion 41 through the opening penetrating portion 42 is blocked by the lower opening portion 41. It spreads in the longitudinal direction of the absorbent article 100. Further, by forming the upper opening portion 31 and the lower opening portion 41, the surface area of the upper layer absorber 30 and the lower layer absorber 40 is increased, so that urine and the like can be quickly absorbed. body. Further, liquid such as urine excreted on the upper absorbent body 30 can be guided to the lower absorbent body 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.

Further, in the present embodiment, the wide portion 43 of the lower opening portion 41 overlaps with the upper opening portion 31. In other words, the wide portion 43 of the lower opening portion 41 corresponds to the opening penetrating portion 42. In this manner, the wide portion 43 of the lower opening portion 41 overlaps with the upper opening portion 31, and even if a large amount of liquid passes through the upper opening portion 31 and flows into the lower opening portion 41 at a time, the wide portion 43 can be used. Store a relatively large amount of liquid. Therefore, even if a large amount of liquid flows into the lower opening portion 41 at a time, liquid overflow can be avoided. Further, since the liquid stored in the wide portion 43 of the lower opening portion 41 is slowly diffused in the longitudinal direction along the lower opening portion 41, the return of the liquid can be prevented.

As shown in Fig. 6 and Fig. 7, in the present embodiment, the shape 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 an hourglass type, and the lower layer absorber 40 is formed into a rectangular shape. In this manner, the shape of the upper layer absorber 30 and the lower layer absorber 40 may be different. In particular, when the upper layer absorber 30 has the extending portion 32 and the extending portion 32 is superposed on the lower layer absorber 40, the front body 1 and the back body 2 are expanded outward in the width direction from the lower layer absorber 40. Therefore, in the present embodiment, the portion of the upper layer absorbent body 30 where only the extending portion 32 is formed is larger than the lower layer absorbent body 40. As described above, by increasing the size of the upper absorbent body 30, when urine or the like is excreted, it can be quickly absorbed in a wide range of the upper absorbent body 30, thereby preventing leakage of urine. In addition, the lower layer absorber 40 disposed under the upper layer absorber 30 may be formed into a gourd type in the same manner as the upper layer absorber 30, but the wearing feeling of the absorbent article 100 is lowered, which is not preferable. Therefore, according to the present embodiment, the shape of the lower layer absorber 40 is formed smaller than the rectangular shape of the upper layer absorber 30, so that the entire The absorption amount of the absorbent article 100 is increased, and the wearing feeling can be favorably maintained.

As shown in the cross-sectional view of Fig. 7, the absorbent article 100 of the present embodiment includes the first diffusion sheet 61 and the 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. Further, the second diffusion sheet 62 is disposed between the lower layer absorber 40 and the back sheet 20, has a portion covering the skin non-opposing surface of the lower layer absorber 40, and has a portion covering and covering the side of each of the absorbers 30, 40. A portion of the upper absorbent body 30 that faces a portion of the face. Further, the first diffusion sheet 61 and the second diffusion sheet 62 are overlapped on the right and left sides in the width direction of the skin opposing surface side of the upper layer absorber 30, and are joined to each other. In this manner, the first diffusion sheet 61 and the second diffusion sheet 62 are joined to each other such that the upper layer absorber 30 and the lower layer absorber 40 are surrounded. The first diffusion sheet 61 and the second diffusion sheet 62 are sheet-like members having liquid diffusibility which absorbs liquid and can diffuse. Each of the diffusion sheets 61 and 62 may be a tissue such as a tissue paper or a non-woven fabric.

As shown in FIGS. 6 and 7, the absorbent article 100 of the present embodiment further has an SAP layer 50. As shown in the cross-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 agglomeration of a plurality of granular superabsorbent polymers (SAP). Basically, the SAP layer 50 is a layer composed only of a super absorbent polymer. The SAP layer 50 is held between the absorbers 30 and 40 by sandwiching a plurality of superabsorbent polymers with the upper absorber 30 and the lower absorber 40. The thickness of the SAP layer 50 can be appropriately adjusted, and is set to, for example, about 0.1 mm to 2 mm or 0.5 mm to 1.5 mm.

Further, as shown in the plan view of FIG. 6, the SAP layer 50 is formed at least on the left and right sides in the width direction of the opening penetrating portion 42 in which the upper opening portion 31 and the lower opening portion 41 overlap each other. Further, in the present embodiment, the respective SAP layers of the left and right SAP layers 50 are not only located in the opening. The left and right sides of the portion 42 further have a portion extending toward the distal end side in the longitudinal direction from the opening penetrating portion 42 and a portion extending further from the rear end side in the longitudinal direction than the opening penetrating portion 42. Specifically, the left and right SAP layers 50 are formed along the left and right sides of the lower opening 41 in a length similar to the lower opening 41 or a length longer than 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 and at least the left and right sides of the opening penetrating portion 42, the SAP layer 50 can be absorbed through the opening penetrating portion 42 and flow into the lower opening portion. 41 liquid. More specifically, as described above, since the upper opening portion 31 and the lower opening portion 41 are formed in the respective absorbers of the upper layer absorber 30 and the lower layer absorber 40, the liquid flowing into the openings 31 and 41 is dispersed. In the length direction of the absorbent article. Moreover, by providing the SAP layer 50 at least on both sides of the opening penetrating portion 42, the SAP layer 50 can effectively absorb the liquid diffused by the openings 31, 41. Thereby, even if a large amount of urination is performed at once, it spreads over a wide range of the SAP layer 50 and is absorbed, so that leakage of urine 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 permeating the upper layer absorber 30 or the liquid permeating the lower layer absorber 40 can be transferred to the SAP layer 50. Thereby, the SAP layer 50 absorbing the liquid swells and gels, and it is difficult to synthesize the liquid, so that the return of the liquid can be prevented. Further, since a large amount of liquid can be prevented from locally contacting the SAP layer 50 at once, even if the SAP layer 50 having a slow liquid absorption rate can absorb a large amount of liquid in a wide range, it is possible to prevent leakage of urine.

Further, as shown in the cross-sectional view of Fig. 7, in the present embodiment, the SAP layer 50 is formed on the left and right sides in the width direction of the lower opening portion 41. That is, the SAP layer 50 does not overlap the lower opening portion 41 in the thickness direction. Thus, by setting the SAP layer 50 not to overlap the lower side The range of the opening portion 41 allows the entire SAP layer 50 to be completely sandwiched by the upper layer absorber 30 and the lower layer absorber 40. Therefore, even if the wearer of the absorbent article moves a lot, the superabsorbent polymer constituting the SAP layer 50 can be prevented from falling into the lower opening portion 41.

[2. Second embodiment]

Next, a second embodiment of the absorbent article 100 according to the second aspect of the invention will be described with reference to Fig. 8. Fig. 8 is a plan view showing the absorbent article 100 according to the second embodiment. The second embodiment is not described in the same manner as the first embodiment, and a structure different from the first embodiment will be described.

As shown in Fig. 8, in the absorbent article 100 according to the second embodiment, the width of the opening penetrating portion 42 is overlapped only in the upper opening portion 31 of the upper layer absorbent body 30 and the lower opening portion 41 of the lower layer absorbent body 40. An SAP layer 50 is formed on the left and right sides of 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 on the front body 1 of the absorbent article 100. When the SAP layer 50 is formed on at least the right and left sides in the width direction of the opening penetrating portion 42, the liquid can be diffused in the longitudinal direction by the lower opening portion 41, and the superabsorbent polymerization can be utilized around the opening penetrating portion 42. (SAP) collects liquid. Therefore, the SAP layer 50 can be utilized to effectively absorb the liquid and prevent its return.

Further, in the absorbent article 100 according to the second embodiment, unlike the above-described first embodiment, the upper opening 31 of the upper absorbent body 30 is formed in an elliptical shape. Further, the lower opening portion 41 of the lower layer absorber 40 has a wider width than the upper opening portion 31. In this manner, the entire width of the lower opening portion 41 may be formed wider than the width of the upper opening portion 31.

[3. Third embodiment]

Next, referring to FIG. 9 and FIG. 10, regarding the suction of the second invention The third embodiment of the article 100 will be described. Fig. 9 is a plan view showing the absorbent article 100 according to the third embodiment. In addition, Fig. 10 is a cross-sectional view schematically showing a cross-sectional structure of the absorbent article 100 of the X4-X4 line shown in Fig. 9. The third embodiment will be described focusing on a structure different from the above-described first embodiment.

As shown in the plan view of FIG. 9, the lower opening portion 41 has a base portion 44 that linearly extends in the longitudinal direction, and a plurality of branch portions 45 that extend from the base portion 44 to the left and right outer sides in the width direction. Specifically, in the present embodiment, the length of the base portion 44 of the lower opening portion 41 in the longitudinal direction is longer than that of the upper opening portion 31, and is formed from the length of the front body 1 through the lower stage portion 3 to the back body 2. Further, the width of the base portion 44 of the lower opening portion 41 is wider than the width of the upper opening portion 31. Further, an SAP layer 50 is formed on the left and right sides of the base portion 44 of the lower opening portion 41. On the other hand, in the present embodiment, the branch portion 45 is formed at one position on the left and right sides at the position on the distal end side in the longitudinal direction, and is formed at the left and right positions at the position on the rear end side in the longitudinal direction, and is formed in four places in total. In this manner, the branch portions 45 are formed to extend from the base portion 44 to the left and right outer sides in the width direction. Therefore, the branch portion 45 at least partially overlaps the SAP layer 50 in the thickness direction. Further, as shown in FIG. 9, the branch portion 45 is preferably formed on the left and right sides in the width direction of the opening penetrating portion 42 in which the upper opening portion 31 and the lower opening portion 41 overlap. As described above, by providing the branch portions 45 on the left and right sides of the opening penetrating portion 42, the liquid flowing in from the opening penetrating portion 42 can be quickly diffused to the outside in the width direction.

FIG. 10 is a cross-sectional view showing the position of the branch portion 45 in which the lower opening portion 41 is formed. As shown in Fig. 10, in the branch portion 45 of the lower opening portion 41, the SAP layer 50 is overlapped in the thickness direction. The SAP layer 50 is formed by agglomerating a plurality of granular superabsorbent polymers (SAP). Therefore, when the SAP layer 50 is overlapped with the branch portion 45, the superabsorbent polymer falls off the branch portion 45. Thus, in the third embodiment, As shown in Fig. 10, a third diffusion sheet 63 is provided between the SAP layer 50 and the lower layer absorber 40, and the third diffusion sheet 63 covers the lower opening portion 41 and has liquid diffusibility. Similarly to the first diffusion sheet 61 and the second diffusion sheet 62, the third diffusion sheet 63 is a sheet-like member having liquid diffusion property capable of absorbing liquid and diffusing. The third diffusion sheet 63 may be a tissue such as a tissue paper or a non-woven fabric. Examples of the non-woven fabric include a breathable nonwoven fabric, a non-woven fabric, a spunbond nonwoven fabric, and a melt blown nonwoven fabric.

As shown in Fig. 10, the SAP layer 50 can be formed on the third diffusion sheet 63 by providing the third diffusion sheet 63 so as to cover the skin of the lower layer absorber 40 as a whole. Thereby, the SAP layer 50 is held so as to be sandwiched by the third diffusion sheet 63 and the upper layer absorber 30, so that the superabsorbent polymer constituting the SAP layer 50 can be prevented from falling off to the lower opening of the lower layer absorber 40. Part 41. Further, by covering the lower opening portion 41 of the lower layer absorber 40 with the third diffusion sheet 63, the liquid flowing into the lower opening portion 41 can be effectively diffused. Thereby, the liquid is absorbed in a wide range of the upper absorbent body 30 and the lower absorbent core 40, so that the absorbent capacities of the two absorbent bodies 30, 40 can be effectively utilized. In particular, it is difficult for the liquid to penetrate into the gap between the upper absorbent body 30 and the lower absorbent core 40. Then, by providing the third diffusion sheet 63 in the gap between the upper layer absorber 30 and the lower layer absorber 40, the liquid can also permeate into the region of the gap between the upper layer absorber 30 and the lower layer absorber 40 which are generally considered to be difficult to absorb the liquid. Further, by providing the third diffusion sheet 63 between the SAP layer 50 and the lower layer absorber 40, the SAP layer 50 can quickly absorb the liquid diffused by the third diffusion sheet 63. Therefore, the liquid which flows into the opening penetrating portion 42 can be surely 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, the liquid can be prevented from leaking to the outside. Further, 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 in volume, It is also difficult to reach the wearer. Therefore, it is possible to provide a wearer with a good wearing feeling before and after excretion of the liquid.

In the present embodiment, the shape of the lower opening portion 41 is described as an example in which the branch portion 45 extends from the front side and the rear side of the base portion 44 toward the left and right sides. However, the shape of the lower opening portion 41 is not limited to this shape, and may be, for example, a Y-shaped shape in which the two branch portions 45 extend from the front end or the rear end of the base portion 44. Further, in the present embodiment, an example in which the SAP layer 50 is overlapped with the branch portion 45 of the lower opening portion 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 may be formed to overlap the base portion 44 of the lower opening portion 41.

Further, in the present embodiment, an example has been described in which the branch portion 45 of the lower opening portion 41 overlaps the SAP layer 50 in the thickness direction. However, the base portion 44 of the lower opening portion 41 may be wider than the region between the left and right SAP layers 50, and the left and right side edge portions of the base portion 44 overlap the SAP layer 50 in the thickness direction. Further, in the form in which the base portion 44 of the lower opening portion 41 overlaps the SAP layer 50, the branch portion 45 may not be formed on the lower opening portion 41. In this case, since the third diffusion sheet 63 is disposed between the lower opening portion 41 and the SAP layer 50, it is possible to prevent the superabsorbent polymer forming the SAP layer 50 from falling off to the lower opening portion 41.

In the above description, in order to express the contents of the present invention, an embodiment of the present invention has been described with reference to the drawings. However, the present invention is not limited to the above-described embodiments, and it is a matter of course that the person skilled in the art can change the form or the modified form of the matters described in the present specification under the obvious conditions.

[Industrial use possibilities]

The present invention relates to an absorbent article such as a disposable diaper or an absorbent pad. Therefore, the present invention can be suitably utilized in manufacturing industries such as absorbent articles.

10‧‧‧Top film

20‧‧‧ Back film

30‧‧‧Upper absorber

31‧‧‧Upper opening

32‧‧‧Extension

40‧‧‧lower absorber/first lower absorber

41‧‧‧Bottom opening/first lower opening

50‧‧‧SAP layer

61‧‧‧First diffuser

62‧‧‧Second diffusion film

63‧‧‧ Third diffuser/liquid diffuser

100‧‧‧Absorbables

W1‧‧‧Width

W2‧‧‧Width

Claims (10)

An absorbent article having a lower portion (3) that, when worn, is located at a front body (1) positioned on the ventral side of the wearer and a rear body (2) positioned on the back side of the wearer The absorbent article comprises: a liquid permeable topsheet (10) on the opposite side of the skin; a liquid-impermeable backsheet (20) on the non-opposite side of the skin; and a plurality of absorptions a body interposed between the top sheet (10) and the back sheet (20), overlapping the thickness direction; the plurality of absorbers at least comprising: an upper layer absorber (30) on the side of the top sheet (10) And a lower layer absorber (40) on the side of the back sheet (20); the upper layer absorber (30) has an upper opening (31) extending along the length direction, having a predetermined The lower layer absorber (40) has a lower opening (41), and the lower opening (41) extends in the longitudinal direction and has a shorter length than the upper opening (31) and a width, the upper opening portion (31) and the lower opening portion (41) at least partially overlapping the thickness direction, wherein the upper layer absorber (30) is wrapped Fluff pulp and super-absorbent polymer, fluff pulp and to support the superabsorbent polymer, the lower layer absorber (40) comprising fluff pulp lines but does not comprise superabsorbent polymer. The absorbent article according to claim 1, wherein a liquid diffusing sheet is disposed between the upper layer absorbent body (30) and the lower layer absorbent body (40). The absorbent article of claim 1, wherein the upper absorbent body (30) and the lower absorbent body (40) are further The step includes an SAP layer (50) formed by arranging a plurality of superabsorbent polymers (SAP), and the SAP layer (50) is formed at least in the width direction of the lower opening portion (41). On the left and right sides. The absorbent article according to claim 3, wherein the SAP layer (50) is formed on the left and right sides in the width direction of the lower opening portion (41) and is formed not in the upper side opening portion (31). ) an area that overlaps in the thickness direction. The absorbent article according to claim 1, wherein either or both of the upper layer absorbent body (30) and the lower layer absorbent body (40) have: the upper side opening portion (31) or the foregoing The left and right sides of the side opening portion (41) in the width direction constitute a low-density region (71) having a relatively low density of fibers of the absorber, and the left and right outer sides in the width direction of the low-density region (71). The density of the fibers of the absorber is relatively high in the high density region (72). An absorbent article comprising: a liquid permeable topsheet (10) on the opposite side of the skin; a liquid-impermeable backsheet (20) on the non-opposite side of the skin; and a plurality of absorbers Between the topsheet (10) and the backsheet (20), overlapping the thickness direction; the absorbent article has a longitudinal direction and a width direction orthogonal to the longitudinal direction; the plurality of absorbers at least An upper layer absorber (30) on the side of the top sheet (10); and a lower layer absorber (40) on the side of the back sheet (20); the upper layer absorber (30) has an upper opening (31), The lower layer absorber (40) has a lower opening (41) extending in the longitudinal direction and at least partially overlapping the upper opening (31), and the upper layer absorber ( 30) further comprising an SAP layer (50) between the lower layer absorber (40), the SAP layer (50) being formed by arranging a plurality of superabsorbent polymers (SAP), and the SAP layer (50) is formed at least The upper side opening portion (31) and the lower side opening portion (41) overlap the left and right sides of the opening portion (42) in the width direction, wherein the upper layer absorber (30) contains fluff pulp and high A water-absorptive polymer, and a superabsorbent polymer is supported by a fluff pulp, and the lower layer absorber (40) contains a fluff pulp but does not contain a superabsorbent polymer. The absorbent article according to claim 6, wherein the opening penetrating portion (42) is formed on the ventral side of the wearer than the center in the longitudinal direction. The absorbent article according to claim 6, wherein the lower opening portion (41) is longer in the longitudinal direction than the upper opening portion (31). The absorbent article of claim 6, wherein the lower opening portion (41) has a wide portion (43) at least in a portion thereof, the wide portion (43) being wider than the upper opening portion (31) It is wider. The absorbent article according to claim 6, wherein a liquid diffusing property is disposed between the lower layer absorbent body (40) and the SAP layer (50) in a region covering the lower opening portion (41). a sheet (63), wherein the SAP layer (50) is at least partially formed at a position overlapping the lower opening portion (41) in the thickness direction, and the SAP layer (50) is located on the liquid diffusion sheet (63) It does not fall into the aforementioned lower opening portion (41).