JP2017189243A - Absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorbent article capable of suppressing lateral leakage.SOLUTION: A disposable diaper 10 comprises: a liquid permeable top sheet 11; a liquid impermeable back sheet 12; and a vertically long absorber 13 interposed between the respective sheets 11, 12. The absorber 13 has plural liquid absorption layers 21-24 laminated in a thickness direction. Out of the respective liquid absorption layers 21-24, a first intermediate layer 23 has first liquid absorption parts 27 and second liquid absorption parts 28 extending in a longitudinal direction of the absorber 13. The first liquid absorption parts 27 are arranged respectively on each of both end sides of the width direction on the first intermediate layer 23, and the second liquid absorption part 28 is adjacent to a center side of the width direction of the respective first liquid absorption part 27. Each first liquid absorption part 27 has a swell degree to the thickness direction in liquid absorption, which is larger than that of the second liquid absorption part 28.SELECTED DRAWING: Figure 2

Description

  The present invention relates to absorbent articles such as disposable diapers and urine pads.

  Conventionally, as an absorbent article such as a disposable diaper, one having a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body interposed between these sheets is known. . The absorber usually has a polymer liquid-absorbing layer containing a superabsorbent polymer (SAP) (see, for example, Patent Document 1). The polymer liquid-absorbing layer is formed by, for example, only a super absorbent polymer.

JP 2013-39163 A

  When the liquid such as urine excreted by the wearer is absorbed by the polymer liquid-absorbing layer, the polymer liquid-absorbing layer swells in the thickness direction and increases its thickness. For example, in the above configuration in which the polymer liquid-absorbing layer is composed only of the highly water-absorbing polymer, the polymer liquid-absorbing layer swells to the same extent in the entire width direction (absorber width direction), and the thickness of the polymer liquid-absorbing layer is the width direction. It is considered to be constant throughout the entire area. That is, in this case, it is considered that the thickness of the absorber is constant throughout the width direction.

  However, if the thickness of the absorbent body is constant after swelling of the absorbent body, when liquid such as urine is subsequently excreted, the liquid may flow in the width direction of the absorbent body, and so-called side leakage may occur. is there. In particular, after the absorption of the absorbent body (after liquid absorption), the liquid absorption capacity (liquid absorption speed) of the polymer liquid absorption layer is considered to be lower than that before the absorbent body (before liquid absorption). It is considered that the liquid that is not absorbed flows in the width direction of the absorber, and side leakage is likely to occur.

  This invention is made | formed in view of the said situation, and makes it a main objective to provide the absorbent article which can suppress that side leakage arises.

  In order to solve the above problems, an absorbent article according to a first aspect of the present invention includes a liquid-permeable top sheet, a liquid-impermeable back sheet, and a vertically long absorbent body interposed between the sheets. In the absorbent article, the absorbent body includes a first liquid absorbing part and a second liquid absorbing part extending in a longitudinal direction thereof, and the first liquid absorbing part is at both ends in the width direction of the absorbent body. Each of the first liquid-absorbing parts is disposed adjacent to the first liquid-absorbing part on the center side in the width direction, and each of the first liquid-absorbing parts is disposed in the thickness direction during liquid absorption. The degree of swelling is larger than that of the second liquid-absorbing part.

  According to the present invention, the absorber has the first liquid absorption part and the second liquid absorption part extending in the longitudinal direction, and the first liquid absorption part among the liquid absorption parts is in the width direction of the absorber. It arrange | positions at both ends, The 2nd liquid absorption part is adjacently arrange | positioned by the center side of the width direction at each of these 1st liquid absorption parts. In this case, since the first liquid-absorbing part has a greater degree of swelling in the thickness direction during liquid absorption than the second liquid-absorbing part, when these liquid-absorbing parts swell after absorbing liquid such as urine In addition, the thickness of the first liquid absorption part can be made larger than the thickness of the second liquid absorption part. Therefore, the thickness of the absorber can be increased at both ends in the width direction of the absorber, and as a result, the absorber can be projected to the top sheet side at both ends of the absorber. Thereby, it can suppress that a liquid flows into the width direction outer side of an absorber by the overhang | projection part of these absorbers, and can suppress that a side leak arises as a result.

  In addition, when the absorbent absorbs the liquid and swells, its absorption capacity (absorption rate) is considered to decrease. Therefore, when liquid such as urine is excreted after the absorbent is swelled, the liquid quickly enters the absorbent. It is considered that liquid that is not absorbed and that is not absorbed easily flows in the width direction of the absorber. In that respect, in the above configuration, since both ends of the absorbent body protrude after the absorbent body swells and the flow of the liquid in the width direction is suppressed, lateral leakage is suitably suppressed after the absorbent body swells. can do.

  Note that “the first liquid absorption part has a greater degree of swelling in the thickness direction than the second liquid absorption part” means that the first liquid absorption part and the second liquid absorption have the same thickness, the same width, and the same length. This means that when the same amount of liquid (for example, water) is absorbed and swollen in each part, the thickness after the swelling is greater in the first liquid-absorbing part than in the second liquid-absorbing part.

  The absorbent article according to a second aspect of the present invention is the absorbent article according to the first aspect, wherein the absorbent body includes one or more liquid passages extending along the longitudinal direction and having grooves or slits open to the top sheet side. And the second liquid absorption part is disposed on both sides of the one or more liquid passages in the width direction, and each of the second liquid absorption parts is disposed adjacent to the liquid passage. In addition, each of the second liquid-absorbing parts is characterized in that the first liquid-absorbing part is disposed adjacent to the opposite side of the liquid passage.

  According to the present invention, since the absorber is provided with one or more liquid passages extending in the longitudinal direction, liquid such as urine can be diffused through the liquid passages. For this reason, the liquid can be easily absorbed in a wide range in the longitudinal direction of the absorber. In addition, the second liquid absorption part is disposed on both sides of the one or more liquid passages, and each of the second liquid absorption parts is disposed adjacent to the liquid passage. And each 1st liquid absorption part is arrange | positioned adjacent to each 2nd liquid absorption part on the opposite side to a liquid channel | path, respectively. In such a configuration, when each liquid absorption part absorbs the liquid and swells, the part (first part) farther from the liquid path than the thickness of the part adjacent to the liquid path (the part including the second liquid absorption part) in the absorber. The thickness of the portion including the liquid absorbing portion) can be increased. For this reason, it is possible to project a portion of the absorber that is further away from the liquid passage than the portion adjacent to the liquid passage to the top sheet side. Thereby, it is possible to easily guide the liquid such as urine from the overhanging portion toward the liquid passage, and as a result, it is possible to promote the diffusion of the liquid through the liquid passage. Therefore, in this case, the liquid absorption efficiency can be improved.

  In addition, when the absorbent capacity (absorption rate) of the absorbent body decreases after the absorbent body swells, when the liquid such as urine is excreted thereafter, the liquid remains without being quickly absorbed by the absorbent body. It is assumed that In that respect, in the above-described configuration, it is easy to guide liquid such as urine to the liquid passage after swelling of the absorber, so that the liquid remaining without being absorbed can be suitably guided to the liquid passage. Therefore, it is possible to suitably improve the liquid absorption efficiency after the absorbent body swells.

  An absorbent article according to a third aspect is the absorbent material according to the second aspect, wherein the absorbent body is laminated on each of the liquid absorbent parts in a state of straddling the adjacent first liquid absorbent part and the second liquid absorbent part. The third liquid absorbing part is disposed adjacent to the liquid passage in the width direction together with the second liquid absorbing part, and the degree of swelling in the thickness direction is It is larger than the 2nd liquid absorption part, It is characterized by the above-mentioned.

  In the above-described configuration in which the second liquid absorption part having a small degree of swelling in the thickness direction is disposed adjacent to the liquid passage, the thickness does not increase so much even if the second liquid absorption part absorbs the liquid and swells. It is assumed that the depth of the liquid passage does not increase so much later. Therefore, in the present invention, in view of this point, a third liquid absorption part having a greater degree of swelling in the thickness direction than the second liquid absorption part in a state of straddling the first liquid absorption part and the second liquid absorption part is provided. The third liquid absorbing part is disposed adjacent to the liquid passage. That is, in this case, in addition to the second liquid absorption part, a third liquid absorption part having a higher degree of swelling than that is disposed adjacent to the liquid passage. In such a configuration, the third liquid-absorbing part swells relatively large during liquid absorption, and thus the depth of the liquid passage can be relatively large after swelling. Thereby, the diffusion of the liquid through the liquid passage can be suitably performed after the swelling.

  In addition, it is considered that when the absorbent capacity (absorption rate) of the absorbent body decreases after the absorbent body swells, liquid that is not absorbed by the absorbent body easily flows into the liquid passage. For this reason, after swelling, the amount of liquid flowing through the liquid passage is considered to be larger than before swelling (before liquid absorption). In particular, in the second aspect, since the liquid is easily guided to the liquid passage after the swelling, it is considered that the amount of the liquid flowing through the liquid passage after the swelling is increased from that point. Therefore, even in view of these points, it can be said that it is significant to increase the depth of the liquid passage after swelling.

  In the absorbent article according to a fourth aspect of the present invention, in the third aspect, the third liquid absorption part is disposed on the back sheet side of the adjacent first liquid absorption part and the second liquid absorption part. It is characterized by.

  According to the present invention, since the third liquid-absorbing part is disposed across the back sheet side of the first liquid-absorbing part and the second liquid-absorbing part, each of these liquid-absorbing parts (particularly the first liquid-absorbing part) ) Can be suppressed from swelling on the back sheet side. In this case, since each liquid absorption part (especially 1st liquid absorption part) can accelerate | stimulate the swelling to the top sheet side, the both ends side of the width direction of an absorber can be suitably protruded to the top sheet side. . Thereby, suppression of the side leakage by those overhang | projection parts, etc. can be aimed at suitably.

  An absorbent article according to a fifth invention is the absorbent article according to any one of the second to fourth inventions, wherein the first liquid-absorbing part is formed to contain a highly water-absorbing polymer, and the adjacent first liquid-absorbing part. And a liquid-permeable sheet material that covers at least the second liquid-absorbing part and extends along each liquid-absorbing part, and the sheet material is folded on the liquid passage side to sandwich the folded part. The both side portions are respectively disposed on both sides in the thickness direction of the adjacent first liquid absorbing portion and the second liquid absorbing portion, and the both side portions of the sheet material are not fixed to each other on the side opposite to the folded portion. It is characterized by being.

  According to the present invention, since the first liquid-absorbing part and the second liquid-absorbing part containing the superabsorbent polymer are covered from the liquid passage side by the sheet material, the superabsorbent polymer is prevented from entering the liquid passage. can do. As a result, it is possible to avoid a situation in which the superabsorbent polymer that has entered the liquid passage swells and the liquid passage is blocked.

  In addition, since the sheet material has both side portions sandwiching the folded portion in an unfixed state on the side opposite to the folded portion, the sheet material swells in the thickness direction of the first liquid absorbing portion and the second liquid absorbing portion. It can suppress that (especially swelling of a 1st liquid absorption layer) is restrict | limited by a sheet material. Therefore, side leakage can be suppressed while avoiding a situation where the liquid passage is blocked.

  An absorbent article according to a sixth aspect of the present invention is the absorbent article according to the fifth aspect, wherein the sheet material is coated with a liquid-absorbing assembly portion including a plurality of liquid-absorbing portions including the adjacent first liquid-absorbing portion and the second liquid-absorbing portion. The both side portions of the sheet material are respectively fixed to both surfaces in the thickness direction of the liquid absorption assembly portion.

  According to the present invention, the sheet material covers the liquid absorbent collecting portion including the first liquid absorbing portion and the second liquid absorbing portion, and both side portions sandwiching the folded portion in the sheet material are each in the thickness direction of the liquid absorbent collecting portion. It is fixed on both sides. In addition, in this way, the both side portions are fixed to the liquid absorption assembly portion, and the both side portions are not fixed to each other on the side opposite to the folded portion as described above. In such a configuration, when the liquid absorbing collection part swells by absorbing liquid, swelling in the thickness direction is largely limited by the sheet material (specifically, the folded part) on the liquid passage side in the liquid absorption collecting part. On the other hand, on the side away from the liquid passage, swelling in the thickness direction is not limited as much as the liquid passage side. For this reason, in such a configuration, when the liquid absorption collecting portion swells, the thickness of the liquid absorption collecting portion can be made easier on the side farther from the liquid passage than on the liquid passage side. Therefore, in this case, a portion of the absorbent body that is away from the liquid passage (and further, both end sides in the width direction of the absorbent body) can be further projected to the top sheet side, thereby causing side leakage due to the projected portion. In addition to enhancing the suppression effect, it is possible to further improve the liquid absorption efficiency.

  An absorbent article according to a seventh invention is the absorbent article according to any one of the second to sixth inventions, wherein the one or more liquid passages include the groove portions, and the absorbent body serves as a liquid absorption layer. A back sheet side layer provided across the back sheet side of the liquid part and each of the second liquid absorbing parts is provided, and the back sheet side layer covers the one or more grooves from the back sheet side. It is arranged so that it may be arranged.

  According to the present invention, the back sheet side layer is provided across the back sheet side of each first liquid absorption part and each second liquid absorption part, and the back sheet side layer includes one or a plurality of groove parts (liquid passages). ) Is covered from the back sheet side. In this case, the first liquid absorption part and the second liquid absorption part (especially the first liquid absorption part) swell to the back sheet side as compared with the case where the liquid passage is formed of a slit that penetrates including the back sheet side layer. Can be suppressed. Therefore, each liquid absorption part (especially 1st liquid absorption part) can be swelled to the top sheet side, and, as a result, the both ends of the width direction of an absorber can be suitably projected to the top sheet side. . Thereby, suppression of the side leakage by those overhang | projection parts, etc. can be aimed at suitably.

  An absorbent article according to an eighth aspect of the present invention is the absorbent article according to any one of the first to seventh aspects, wherein the first liquid-absorbing part is formed of a highly water-absorbing polymer, and the second liquid-absorbing part is a fiber material. It is formed by these.

  Superabsorbent polymer (SAP) has the property that it swells when its liquid such as urine is absorbed and its volume becomes remarkably large. On the other hand, fiber materials such as pulp have the property that even if they absorb liquid, they do not swell so much and their volume does not change so much. Therefore, in the present invention, paying attention to this point, the first liquid-absorbing part is formed of a highly water-absorbing polymer, and the second liquid-absorbing part is formed of a fiber material. In this case, since the degree of swelling in the thickness direction of each of the liquid absorbing parts can be greatly different, the thickness of the first liquid absorbing part is larger than the thickness of the second liquid absorbing part when each liquid absorbing part swells. Can be greatly enlarged. Therefore, the absorbent body can be largely projected toward the top sheet side at both end sides in the width direction of the absorbent body, and as a result, the side leakage suppressing effect by these projecting portions can be enhanced.

The expanded view shown in the state which expand | deployed the disposable diaper. Sectional drawing which shows the structure of a disposable diaper. It is sectional drawing which shows the structure of an absorber, (a) has shown the state before the swelling of an absorber, (b) has shown the state after the swelling of an absorber. (A) is a front view showing the top sheet side layer, (b) is a front view showing the first intermediate layer, (c) is a front view showing the second intermediate layer, and (d) is a front view showing the back sheet side layer. FIG. It is sectional drawing which shows the structure of the absorber in other embodiment, (a) has shown the state before the swelling of an absorber, (b) has shown the state after the swelling of an absorber.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In this embodiment, the water absorbent article of the present invention is embodied as a disposable diaper. FIG. 1 is a developed view showing the disposable diaper in a developed state. Moreover, in FIG. 1, the disposable diaper of the expansion | deployment state is seen from the top sheet side. FIG. 2 is a cross-sectional view showing the configuration of the disposable diaper. 2 corresponds to a cross-sectional view taken along line AA in FIG.

  As shown in FIG. 1, the disposable diaper 10 of the present embodiment is a so-called tape-type disposable diaper. For example, an adult (elderly) disposable diaper used for an adult (elderly) Has been. The disposable diaper 10 (hereinafter referred to as diaper 1 for short) includes an abdominal side portion 10a disposed on the wearer's ventral side at the time of wearing, a back side portion 10b disposed on the wearer's back side, And a crotch part 10c disposed on the crotch. The diaper 10 has an elongated shape that is long in the arrangement direction in which these portions 10a to 10c are arranged. The arrangement direction is the longitudinal direction (the vertical direction in FIG. 1), and the direction orthogonal to the longitudinal direction and the thickness direction is a width. Direction (left-right direction in FIG. 1).

  As shown in FIGS. 1 and 2, the diaper 10 includes a liquid-permeable top sheet 11, a liquid-impermeable back sheet 12, and an absorber 13 interposed between the two sheets 11 and 12. Prepare. The top sheet 11 is a member on the skin side arranged so as to contact (oppose) the wearer's skin, and the back sheet 12 is a member arranged on the side opposite to the skin side (hereinafter also referred to as the anti-skin side). is there. The top sheet 11, the back sheet 12, and the absorber 13 all have a vertically long shape that is long in the longitudinal direction of the diaper 10.

  The top sheet 11 is formed of a liquid permeable material (hydrophilic material), for example, a nonwoven fabric. The top sheet 11 has a rectangular shape (rectangular shape), the length in the longitudinal direction is the same as the length in the longitudinal direction of the diaper 10, and the length in the width direction is the width direction of the absorbent body 13. It is slightly larger than the length. The top sheet 11 is arrange | positioned so that the absorber 13 may be covered from the skin side, and specifically, it arrange | positions so that the whole absorber 13 may be covered from the skin side.

  The back sheet 12 is formed of a liquid-impermeable material (hydrophobic material), and is formed of a resin film such as a polyethylene resin. The back sheet 12 has a rectangular shape (rectangular shape), the length in the longitudinal direction is slightly larger than the length in the longitudinal direction of the absorber 13, and the length in the width direction is the width direction of the absorber 13. It is slightly larger than the length. The back sheet 12 is disposed so as to cover the absorbent body 13 from the side opposite to the top sheet 11 side (in other words, the anti-skin side), and more specifically, is disposed so as to cover the entire absorbent body 13 from the anti-skin side. . The back sheet 12 is bonded to the absorbent body 13 using a hot melt adhesive or the like.

  According to the above configuration, the liquid such as urine excreted by the wearer passes through the top sheet 11 and is absorbed by the absorbent body 13 and held in the absorbent body 13. The back sheet 12 prevents the liquid absorbed and held by the absorber 13 from leaking out of the diaper 10. The configuration of the absorber 13 will be described later.

  The diaper 10 is provided with a pair of side sheets 14 on both sides of the absorbent body 13 in the width direction. Each side sheet 14 extends in the longitudinal direction of the diaper 10, and the length thereof is the same as the length of the diaper 10 in the longitudinal direction. The side sheet 14 is disposed across the top sheet 11 and the back sheet 12, one end side in the width direction is joined to the top sheet 11 using a hot melt adhesive or the like, and the other end side is hot to the back sheet 12. Bonded using a melt adhesive or the like.

  Each side sheet 14 is formed with an upright portion 14 a that rises from the vicinity of the joint with the top sheet 11 toward the side opposite to the top sheet 11 (in other words, the skin side). The standing portion 14a extends in the longitudinal direction of the side sheet 14, and an elastic member 15 such as elastic rubber is disposed along the longitudinal direction in the standing portion 14a. In this case, the upright portion 14a and the elastic member 15 form a three-dimensional gather, and the three-dimensional gather prevents liquid such as urine from leaking sideways. In FIG. 1, for the sake of convenience, the elastic member 15 is indicated by a one-dot chain line.

  An elastic member 16 such as a thread rubber having elasticity is disposed at a joining portion where the side sheet 14 and the back sheet 12 are joined. The elastic member 16 is disposed between the sheets 12 and 14 along the longitudinal direction of the side sheet 14. Leg gathers are constituted by the elastic members 16 and the like, and the leg gathers enhance the adhesion around the legs. In FIG. 1, for convenience, the elastic member 16 is indicated by a two-dot chain line.

  The back sheet 12 is provided with a cover sheet 19 on the side opposite to the skin. The cover sheet 19 is a sheet for reinforcing the back sheet 12 and improving the touch of the diaper 10. The cover sheet 19 is formed of a liquid-impermeable material (hydrophobic material), for example, a non-woven fabric, particularly a non-woven fabric excellent in touch. The cover sheet 19 has a shape that substantially matches the appearance of the diaper 10 when viewed in plan. The cover sheet 19 is joined to the back sheet 12 using a hot melt adhesive or the like.

  The cover sheet 19 is provided with a pair of hook tapes 17 at portions corresponding to the back side portion 10 b of the diaper 10. These hook tapes 17 are respectively attached to both ends of the cover sheet 19 in the width direction. Further, a front patch 18 is attached to the cover sheet 19 at a portion corresponding to the abdomen side portion 10 a of the diaper 10. The front patch 18 is attached to the center of the cover sheet 19 in the width direction. A hook tape 17 can be fastened to the front patch 18, and when the diaper 10 is attached, the diaper 10 is attached by fastening each hook tape 17 to the front patch 18.

  Next, the configuration of the absorber 13 will be described in detail with reference to FIG. 3 in addition to FIG. FIG. 3 is a cross-sectional view showing the configuration of the absorber 13. 3A shows a state before the absorber 13 absorbs the liquid, that is, a state before the absorber 13 absorbs the liquid and swells (initial state), and FIG. 3B shows the absorption. The state after the body 13 absorbs the liquid and swells is shown.

  As shown in FIG. 1, the absorbent body 13 has a rectangular shape (rectangular shape) that is long in the longitudinal direction of the diaper 10. Therefore, as for the absorber 13, the longitudinal direction is the same direction as the longitudinal direction of the diaper 10, and the width direction is the same direction as the width direction of the diaper 10.

  As shown to Fig.3 (a), the absorber 13 has the some liquid absorption layers 21-24 laminated | stacked on the thickness direction. That is, the absorber 13 has a multilayer structure composed of the plurality of liquid absorption layers 21 to 24. Each of these liquid absorbing layers 21 to 24 has a rectangular (rectangular) mat shape (plate shape), and the size in plan view (specifically, the length in the longitudinal direction and the length in the width direction) Are the same size.

  The absorbent body 13 includes, as a liquid absorption layer, a topsheet side layer 21 disposed on the topsheet 11 side, a backsheet side layer 22 disposed on the backsheet 12 side, the topsheet side layer 21 and the backsheet side. Intermediate layers 23, 24 disposed between the layers 22. The intermediate layers 23 and 24 include a first intermediate layer 23 and a second intermediate layer 24 that are stacked in the thickness direction. Therefore, the intermediate layer has a two-layer structure including these intermediate layers 23 and 24. Of the intermediate layers 23 and 24, the first intermediate layer 23 is disposed on the top sheet 11 side and is adjacent to the top sheet side layer 21. The second intermediate layer 24 is disposed on the backsheet 12 side and is adjacent to the backsheet side layer 22. Thus, this absorber 13 has a four-layer structure in which the topsheet side layer 21, the first intermediate layer 23, the second intermediate layer 24, and the backsheet side layer 22 are laminated in this order.

  The absorbent body 13 is formed with a groove portion 31 opened to the top sheet 11 side. The groove portion 31 extends along the longitudinal direction of the absorbent body 13 and is formed across the abdominal side portion 10a, the crotch portion 10c, and the back side portion 10b. Only one groove portion 31 is formed in the absorbent body 13, and is disposed at a substantially central portion in the width direction of the absorbent body 13. In this case, since liquid such as urine can be diffused in the longitudinal direction of the absorber 13 through the groove portion 31, the liquid can be absorbed in a wide range in the longitudinal direction of the absorber 13. The groove 31 corresponds to a liquid passage.

  The groove 31 is formed across the top sheet side layer 21, the first intermediate layer 23, and the second intermediate layer 24 of the absorber 13. That is, slits 32 to 34 extending in the longitudinal direction of the absorber 13 are formed in the respective layers 21, 23 and 24 of the absorber 13 (see also FIGS. 4A to 4C). All 34 penetrate each layer 21,23,24 in the thickness direction, and are in the state which mutually connected. And the groove part 31 is formed by each of these slits 32-34 connected.

  Then, the structure of each liquid absorption layer 21-24 is demonstrated, referring FIG. 4 in addition to Fig.3 (a). 4A is a front view showing the top sheet side layer 21, FIG. 4B is a front view showing the first intermediate layer 23, and FIG. 4C is a front view showing the second intermediate layer 24. (D) is a front view showing the back sheet side layer 22.

  The top sheet side layer 21 is formed of pulp, specifically, a pulp layer formed of only pulp. Thereby, in the topsheet side layer 21, the liquid absorption speed is increased. The slit 32 is formed in the top sheet side layer 21 as described above. As shown in FIG. 4A, the slit 32 is in a closed state in which both end portions in the longitudinal direction do not reach the edge of the topsheet side layer 21. However, both ends of the slit 32 in the longitudinal direction may be formed so as to reach the edge of the topsheet side layer 21 and may be opened.

  The backsheet side layer 22 is a mixed layer formed by mixing a superabsorbent polymer (SAP) and pulp. Thereby, in the back sheet | seat side layer 22, it is possible to hold | maintain a liquid firmly. In the backsheet side layer 22, as shown in FIG.4 (d), unlike the other liquid absorption layers 21,23,24, the slit is not formed. Therefore, the back sheet side layer 22 is disposed in a state where the groove portion 31 of the absorber 13 is covered from the back sheet 12 side. In addition, the backsheet side layer 22 is good also as a pulp layer formed only with the pulp similarly to the topsheet side layer 21. FIG.

  As shown in FIG. 4B, the first intermediate layer 23 has a first liquid absorption part 27 and a second liquid absorption part 28 extending in the longitudinal direction. Each of these liquid absorbing portions 27, 28 is provided in pairs and extends over the entire length of the first intermediate layer 23. In addition, each of the liquid absorbing portions 27 and 28 has the same thickness, and both have the same width.

  The first liquid absorbing portion 27 is formed of a highly water-absorbing polymer, and more specifically is a polymer layer formed only of the highly water-absorbing polymer. Moreover, the 2nd liquid absorption part 28 is a pulp layer formed with the pulp in detail, and was formed only with the pulp. Here, the superabsorbent polymer has the property that it swells when the liquid such as urine is absorbed and its volume becomes remarkably large, whereas the pulp (and thus the fiber material) does not absorb so much liquid such as urine. It has the property that it does not swell and its volume does not change much. That is, the superabsorbent polymer is a material having a large degree of swelling (swelling rate) at the time of liquid absorption, whereas pulp is a material having a small degree of swelling (swelling rate) at the time of liquid absorption. Therefore, the 1st liquid absorption part 27 which consists of a highly water-absorbing polymer becomes a high swelling degree layer with a large swelling degree, and the 2nd liquid absorption part 28 which consists of a pulp becomes a low swelling degree layer with a small swelling degree. . As described above, the first liquid absorbing portion 27 has a higher degree of swelling than the second liquid absorbing portion 28, and more specifically, the first liquid absorbing portion 27 has a degree of swelling at least in the thickness direction larger than that of the second liquid absorbing portion 28. .

  In the first intermediate layer 23, the second liquid absorbing portions 28 are arranged adjacent to each other with a predetermined gap in the width direction. In this case, a gap between each of the second liquid absorbing portions 28 is the slit 33 described above. Therefore, the slit 33 is in a state where both ends in the longitudinal direction are open. However, both end portions in the longitudinal direction of the slit 33 are not necessarily opened and may be closed. In that case, each 2nd liquid absorption part 28 will be in the state integrated mutually.

  Each first liquid absorption part 27 is disposed on both sides of both the second liquid absorption parts 28. In this case, each first liquid absorption part 27 is disposed on both ends in the width direction of the first intermediate layer 23 and constitutes both ends in the width direction of the first intermediate layer 23. In addition, each first liquid absorption part 27 is disposed adjacent to the second liquid absorption part 28 on the side opposite to the slit 33, and in detail is disposed in contact with the second liquid absorption part 28. . As described above, in the first intermediate layer 23, the first liquid absorption part 27 and the second liquid absorption part 28 are both disposed on both sides of the slit 33. In the following description, for the sake of convenience, among the liquid absorbing parts 27 and 28 on both sides of the slit 33, A is given to the reference numerals of the liquid absorbing parts 27 and 28 on one side, and the liquid absorbing parts 27 on the other side. , 28 is denoted by B.

  As shown in FIG. 4C, the second intermediate layer 24 has two third liquid absorbing portions 29 extending in the longitudinal direction. Each of the third liquid absorbing portions 29 is formed of a highly water-absorbing polymer, and more specifically, is a polymer layer formed only of the highly water-absorbing polymer. Accordingly, the degree of swelling of the third liquid absorbing part 29 is greater than that of the second liquid absorbing part 28, and specifically, the degree of swelling in at least the thickness direction is greater than that of the second liquid absorbing part 28. More specifically, the third liquid-absorbing part 29 has the same basis weight as that of the first liquid-absorbing part 27 in the high water-absorbing polymer. The degree of swelling is the same as that of the first liquid absorption part 27.

  Each of the third liquid absorbing portions 29 is disposed with a predetermined gap in the width direction. In this case, a gap between each of the third liquid absorbing portions 29 is the above-described slit 34. Therefore, the slit 34 is in a state where both ends in the longitudinal direction are open. However, both end portions in the longitudinal direction of the slit 34 are not necessarily opened and may be closed. In that case, each 3rd liquid absorption part 29 will be in the state integrated with each other.

  Each of the third liquid absorbing parts 29 has the same thickness and the same width. The width of the third liquid absorbing part 29 is the same as the sum of the width of the first liquid absorbing part 27 and the width of the second liquid absorbing part 28 of the first intermediate layer 23. In this case, one of the third liquid absorbing parts 29, one of the third liquid absorbing parts 29 (hereinafter referred to as “A”) is the first liquid absorbing part 27A and the second liquid absorbing part of the first intermediate layer 23. The other third liquid-absorbing part 29 (hereinafter referred to as B) is arranged in a state straddling the back sheet 12 side of 28A, and the first liquid-absorbing part 27B and the second liquid-absorbing part 2 of the first intermediate layer 23 are arranged. It arrange | positions in the state ranging over the back seat | sheet 12 side of the liquid absorption part 28B.

  As shown in FIG. 3A, the absorbent body 13 is provided with a pair of sheet materials 41 that cover the intermediate layers 23 and 24. The sheet material 41 has liquid permeability and is made of, for example, a tissue. The sheet material 41 may be a non-woven fabric instead of a tissue.

  One of the sheet materials 41 is provided so as to cover the first liquid absorbing portion 27A, the second liquid absorbing portion 28A, and the third liquid absorbing portion 29A of the intermediate layers 23 and 24, and the other sheet material. 41B is provided so as to cover the first liquid absorption part 27B, the second liquid absorption part 28B, and the third liquid absorption part 29B of each of the intermediate layers 23 and 24. In this case, the liquid absorbing portions 36A are constituted by the liquid absorbing portions 27A to 29A covered by the sheet material 41A, and the liquid absorbing portions 36B are constituted by the liquid absorbing portions 27B to 29B covered by the sheet material 41B. ing.

  Each of the sheet materials 41A and 41B has a long shape extending in the longitudinal direction of each of the liquid absorbing portions 27 to 29 (in other words, the groove portion 31). Specifically, the sheet material 41A and 41B extends over the entire longitudinal direction of each of the liquid absorbing portions 27 to 29. Yes. Each of these sheet materials 41A and 41B has the same configuration, and therefore the configuration of these sheet materials 41A and 41B will be described together below.

  Each sheet material 41 </ b> A (41 </ b> B) is folded back in the width direction of the absorber 13 in the groove portion 31, and more specifically, is folded back to the opposite side in the width direction. In the sheet material 41A (41B), one of the side portions 41b and 41c (hereinafter referred to as the first portion 41b) sandwiching the folded portion 41a is the first liquid absorbing portion 27A (27B) and the second liquid absorbing portion 28A ( 28B) is disposed on the top sheet 11 side surface, and the other (hereinafter referred to as second portion 41c) is disposed on the back sheet 12 side surface of the third liquid absorbing portion 29A (29B). That is, the first portion 41b is interposed between the first liquid absorbing portion 27A (27B) and the second liquid absorbing portion 28A (28B) and the topsheet side layer 21, and the second portion 41c is the third liquid absorbing portion. It is interposed between the portion 29A (29B) and the backsheet side layer 22.

  In such a configuration, the liquid absorbing portions 27A to 29A (27B to 29B), that is, the liquid absorbing collective portion 36A (36B) are covered from the groove portion 31 side by the sheet material 41A (41B). Therefore, it is possible to prevent the pulp and the superabsorbent polymer forming the liquid absorbing portions 27 </ b> A to 29 </ b> A (27 </ b> B to 29 </ b> B) from entering the groove portion 31. In particular, since the highly water-absorbing polymer is a material having a high degree of swelling as described above, there is a possibility that the groove 31 will be blocked if it enters the groove 31 and swells. In this respect, by preventing the superabsorbent polymer from entering the groove 31, it is possible to avoid such a situation.

  The first portion 41b is adhesively fixed to the side surface of each top sheet 11 of the first liquid absorbing portion 27A (27B) and the second liquid absorbing portion 28A (28B) with an adhesive (for example, a hot melt adhesive). The second portion 41c is bonded and fixed to the side surface of the back sheet 12 of the third liquid absorbing portion 29A (29B) with an adhesive (for example, a hot melt adhesive). Therefore, the first portion 41b and the second portion 41c are bonded and fixed to both surfaces in the thickness direction of the liquid absorbing assembly 36A (36B), respectively. In FIG. 2, for convenience, the adhesive 43 is indicated by a black circle.

  Both the first part 41b and the second part 41c are on the side opposite to the folded part 41a, and a part of the first part 41b and the second part 41c is wider than the first liquid absorbing part 27A (27B) and the third liquid absorbing part 29A (29B) ( Absorber width direction) extends outward. In this case, the extended portions of the portions 41b and 41c are end portions on the extended side, in other words, end portions 41d and 41e (free ends) on the opposite sides of the folded portions 41a in the portions 41b and 41c. It faces the outside in the width direction. Accordingly, the first liquid absorption part 27A (27B) and the third liquid absorption part 29A (29B) are not covered from the outside in the width direction by the sheet material 41A (41B), and are exposed to the outside in the width direction. Yes. In this case, the first portion 41b and the second portion 41c are not fixed to each other on the side opposite to the folded portion 41a.

  Next, the effect | action of the absorber 13 mentioned above is demonstrated, referring FIG.

  As shown in FIG. 3A, the absorbent body 13 has a thickness that is the entire area of the absorbent body 13 (specifically, the portion where the groove 31 is formed) before the liquid such as urine is absorbed, that is, before swelling. Excluding) is constant. Then, when a liquid such as urine is excreted by the wearer of the diaper 10 and the liquid is absorbed by the absorber 13, the absorber 13 swells in the thickness direction as shown in FIG.

  Here, the first intermediate layer 23 of the absorbent body 13 is provided with the first liquid-absorbing part 27 and the second liquid-absorbing part 28 having different degrees of swelling in the thickness direction. The thickness of each 1st liquid absorption part 27 arrange | positioned at the side becomes larger than the thickness of each 2nd liquid absorption part 28 arrange | positioned in the width direction inner side (center side). Therefore, after swelling, the thickness of the absorbent body 13 can be increased at both ends in the width direction of the absorbent body 13, and as a result, the absorbent body 13 protrudes toward the top sheet 11 side at both ends of the absorbent body 13. Can do. Thereby, it can suppress that a liquid flows into the width direction outer side of the absorber 13 by the overhang | projection part of these absorbers 13, and can suppress that a side leak arises as a result.

  In the first intermediate layer 23, each second liquid absorbing portion 28 is disposed adjacent to the groove portion 31, and each first liquid absorbing portion 27 is disposed adjacent to the second liquid absorbing portion 28 on the side opposite to the groove portion 31. Therefore, in this case, the thickness of the portion (the portion including the first liquid absorbing portion 27) farther from the groove portion 31 than the thickness of the portion adjacent to the groove portion 31 (the portion including the second liquid absorbing portion 28) in the absorber 13. Can be increased. In this case, since a portion of the absorbent body 13 that is farther from the groove portion 31 than the portion adjacent to the groove portion 31 can be projected to the top sheet 11 side, liquid such as urine can be directed toward the groove portion 31 from the projected portion. It can be made easy to guide. Specifically, the above-described overhanging portion is formed on the absorbent body 13, so that an inclined surface that approaches the backsheet 12 side toward the groove portion 31 side is formed on the surface of the absorbent body 13 on the topsheet 11 side. Thus, the liquid can be easily guided to the groove portion 31 along the inclined surface. Thereby, the diffusion of the liquid through the groove portion 31 can be promoted, and as a result, the liquid absorption efficiency can be improved. In FIG. 3B, the flow of the liquid toward the groove 31 is indicated by an arrow line.

  Furthermore, the absorbent body 13 is covered with the first liquid absorption section 27 and the second liquid absorption section 28 and the third liquid absorption section 29 of the second intermediate layer 24 (that is, the liquid absorption collection sections 36A and 36B). A sheet material 41 is provided. In this case, both side portions 41b and 41c (the first portion 41b and the second portion 41c) sandwiching the folded portion 41a of the sheet material 41 are fixed to both surfaces in the thickness direction of the liquid absorption collecting portions 36A and 36B, respectively. In the opposite side to the folded portion 41a, they are not fixed to each other. In such a configuration, when the liquid absorption collection portions 36A and 36B absorb liquid and swell, the swelling in the thickness direction is caused by the sheet material 41 (specifically, the liquid absorption collection portions 36A and 36B are folded back). While greatly limited by the portion 41a), the swelling in the thickness direction is not limited as much as the groove 31 side on the side away from the groove 31. For this reason, in such a configuration, when the liquid absorption collection portions 36A and 36B swell, the thickness of the liquid absorption collection portions 36A and 36B can be easily increased on the side farther from the groove portion 31 than on the groove portion 31 side. it can. Therefore, in this case, portions of the absorbent body 13 that are separated from the groove 31 (in other words, both ends in the width direction of the absorbent body 13) can be further projected to the top sheet 11 side. For this reason, it is possible to enhance the above-described lateral leakage suppression effect by the overhanging portion and to further improve the liquid absorption efficiency.

  As mentioned above, according to the structure of this embodiment explained in full detail, the following outstanding effects are acquired.

  If the absorbent 13 absorbs the liquid and swells, the absorption capacity (absorption speed) is considered to decrease. Therefore, when the liquid such as urine is excreted after the absorbent 13 swells, the liquid quickly reaches the absorbent 13. It is considered that the liquid that is not absorbed and is not absorbed easily flows in the width direction of the absorber 13. In that respect, as described above, in the above-described embodiment, both ends of the absorbent body 13 project after swelling of the absorbent body 13 and the flow of the liquid to the outside in the width direction is suppressed. Lateral leakage can be suitably suppressed after swelling.

  In addition, if the absorbent capacity (absorption rate) of the absorbent body 13 decreases after the absorbent body 13 swells, it is considered that liquid such as urine is not immediately absorbed into the absorbent body 13 and remains. In that respect, as described above, in the above-described embodiment, liquid such as urine is easily guided to the groove portion 31 after the absorbent body 13 is swollen. Therefore, the liquid remaining without being absorbed by the absorbent body 13 is preferably used for the groove portion 31. Can lead. Thereby, the improvement of liquid absorption efficiency can be aimed at suitably after the absorber 13 swells.

  A third liquid absorbing part 29 having a greater degree of swelling in the thickness direction than the second liquid absorbing part 28 in a state of straddling the first liquid absorbing part 27 and the second liquid absorbing part 28 of the first intermediate layer 23, The third liquid absorbing portion 29 was disposed adjacent to the groove portion 31. In other words, in addition to the second liquid absorbing portion 28, the third liquid absorbing portion 29 having a higher degree of swelling than the second liquid absorbing portion 28 is disposed adjacent to the groove portion 31. In such a configuration, since the third liquid absorbing portion 29 swells relatively large during liquid absorption, the depth of the groove portion 31 can be made relatively large after swelling. Thereby, the diffusion of the liquid through the groove part 31 can be suitably performed after swelling. In particular, if the liquid absorption capacity (absorption speed) of the absorbent body 13 is reduced after swelling, it is considered that liquid that is not absorbed by the absorbent body 13 easily flows into the groove portion 31. Therefore, after swelling, before swelling (before liquid absorption) In comparison, it is considered that the amount of liquid flowing through the groove 31 is increased. Therefore, even in view of this point, it can be said that the significance of increasing the depth of the groove 31 after swelling is great.

  Since the 3rd liquid absorption part 29 was arrange | positioned ranging over the back seat | sheet 12 side of the 1st liquid absorption part 27 and the 2nd liquid absorption part 28, these each liquid absorption parts 27 and 28 (especially 1st liquid absorption part 27). Can be prevented from swelling to the back sheet 12 side. In this case, since each liquid absorption part 27 and 28 (especially 1st liquid absorption part 27) can swell to the top sheet 11 side, the both ends of the width direction of the absorber 13 are suitable for the top sheet 11 side. Can overhang. Thereby, suppression of the side leakage by those overhang | projection parts, etc. can be aimed at suitably.

  The absorber 13 is provided with a backsheet side layer 22 that straddles the backsheet 12 side of each first liquid absorbing portion 27 and each second liquid absorbing portion 28, and the backsheet side layer 22 is grooved from the backsheet 12 side. 31 (corresponding to a liquid passage) was disposed. In this case, the first liquid absorption part 27 and the second liquid absorption part 28 (especially the first liquid absorption part 27) are formed in the back sheet 12 as compared with the case where the liquid passage is formed of a slit that penetrates including the back sheet side layer 22. Swelling to the side can be suppressed. Therefore, it is possible to promote the swelling of each of the liquid absorbing portions 27 and 28 (particularly the first liquid absorbing portion 27) toward the top sheet 11, and as a result, both end sides in the width direction of the absorbent body 13 are suitable for the top sheet 11 side. Can overhang. Thereby, suppression of the side leakage by those overhang | projection parts, etc. can be aimed at suitably.

  The 1st liquid absorption part 27 was formed with the highly water-absorbing polymer, and the 2nd liquid absorption part 28 was formed with the pulp as a fiber material. In this case, since the degree of swelling in the thickness direction of each of the liquid absorption parts 27 and 28 can be greatly varied, the thickness of the first liquid absorption part 27 is reduced to the second absorption when each of the liquid absorption parts 27 and 28 swells. The thickness can be much larger than the thickness of the liquid portion 28. Therefore, the absorbent body 13 can be largely projected toward the top sheet 11 at both end sides in the width direction of the absorbent body 13, and as a result, the side leakage suppressing effect by these projecting portions can be enhanced.

  The sheet material 41 is configured to cover the liquid-absorbing collecting portions 36A and 36B including the first liquid-absorbing portion 27 and the second liquid-absorbing portion 28 from the groove portion 31 side, and the folded portion 41a is sandwiched between the sheet material 41. Both side portions 41b and 41c are not fixed to each other on the side opposite to the folded portion 41a. Thereby, since it can suppress that the swelling (especially swelling of the 1st liquid absorption part 27) in the thickness direction of liquid absorption collection part 36A, 36B is restrict | limited by the sheet | seat material 41, the groove part 31 is plugged up. Side leakage can be suppressed while avoiding the situation.

  Since the first portion 41b, which is one of both side portions 41b and 41c, sandwiching the folded portion 41a of the sheet material 41 is bonded and fixed to the first liquid-absorbing portion 27, the first liquid-absorbing portion is accompanied by the swelling of the first liquid-absorbing portion 27 27 can be prevented from being displaced with respect to the sheet material 41. Similarly, since the second portion 41c, which is the other of the side portions 41b and 41c, is bonded and fixed to the third liquid-absorbing portion 29, the third liquid-absorbing portion 29 becomes a sheet along with the swelling of the third liquid-absorbing portion 29. It is possible to suppress the displacement of the material 41.

  In addition, since the sheet material 41 is composed of a tissue having excellent diffusibility, the liquid can be quickly diffused (arrived) to the first liquid absorbing portion 27 disposed at a position away from the groove portion 31. Thereby, since the 1st liquid absorption part 27 can be swollen rapidly, it becomes possible to acquire the above-mentioned effects, such as side leakage suppression accompanying the swelling, rapidly.

  The present invention is not limited to the above embodiment, and may be implemented as follows, for example.

  (1) In the above embodiment, the second intermediate layer 24 is laminated on the back sheet 12 side of the first intermediate layer 23, but the second intermediate layer 24 may be laminated on the top sheet 11 side of the first intermediate layer 23. Good. In this case, the 3rd liquid absorption part 29 of the 2nd intermediate | middle layer 24 is arrange | positioned in the state straddling the 1st liquid absorption part 27 of the 1st intermediate | middle layer 23, and the top sheet 11 side of the 2nd liquid absorption part 28. FIG. Accordingly, in this case as well, the third liquid absorbing part 29 having a large degree of swelling is disposed adjacent to the groove part 31 together with the second liquid absorbing part 28, so that the depth of the groove part 31 can be made relatively large after swelling. .

  Note that the second intermediate layer 24 may not be provided in the absorber 13, and the intermediate layer may have a single-layer structure including only the first intermediate layer 23.

  (2) In the above-described embodiment, the first liquid absorbing portion 27 is formed only from the highly water-absorbing polymer. There is no need to form. Moreover, in the said embodiment, although the 2nd liquid absorption part 28 was formed only with the pulp, if the 2nd liquid absorption part 28 is formed using a pulp as a main material, it does not necessarily need to be formed only with a pulp.

  Moreover, it is good also considering either one of the 1st liquid absorption part 27 and the 2nd liquid absorption part 28 as a mixed layer containing both a super absorbent polymer and a pulp. Even in this case, the degree of swelling of the first liquid absorbing part 27 in the thickness direction can be made larger than the degree of swelling of the second liquid absorbing part 28 in the thickness direction. Furthermore, it is good also considering the both liquid absorption parts 27 and 28 as a mixed layer containing both a super absorbent polymer and a pulp. Even in that case, by making the basis weight of the highly water-absorbing polymer in the first liquid-absorbing part 27 larger than the basis weight of the highly water-absorbing polymer in the second liquid-absorbing part 28, the thickness direction of the first liquid-absorbing part 27. The degree of swelling of the second liquid absorbing portion 28 can be made larger than the degree of swelling in the thickness direction.

  (3) In the said embodiment, although the 1st liquid absorption part 27 was formed with the pulp (pulp fiber) as a fiber material, the 1st liquid absorption part 27 is made of fiber materials other than pulp fibers, such as rayon fiber and cotton fiber. It may be formed.

  (4) In the above embodiment, the first part 41b of the sheet material 41 is bonded and fixed to the first liquid absorbing part 27 and the second liquid absorbing part 28, respectively, but the first part 41b is fixed to each of the liquid absorbing parts 27 and 28. Of these, only the first liquid absorption part 27 may be bonded and fixed. If the sheet material 41 is bonded and fixed to at least the first liquid absorbing portion 27, it is possible to suppress the displacement of the first liquid absorbing portion 27 with respect to the sheet material 41 when the first liquid absorbing portion 27 swells.

  Moreover, in the said embodiment, although both the side parts 41b and 41c of the sheet | seat material 41 were fixed to both surfaces of the thickness direction of the liquid absorption collection parts 36A and 36B, respectively, only either one of these both side parts 41b and 41c is liquid absorption. You may make it fix to gathering part 36A, 36B. Moreover, you may make it not fix both the side parts 41b and 41c to the liquid absorption assembly part 36A, 36B. In these cases, the sheet material 41 can further suppress the swelling in the thickness direction of the liquid absorption collecting portions 36A and 36B (particularly the first liquid absorption portion 27).

  (5) In the above-described embodiment, when covering the liquid-absorbing collecting portions 36A and 36B with the sheet material 41, the end portions on the opposite sides of the folded portions 41a in the both side portions 41b and 41c of the sheet material 41 are respectively in the absorber width direction. However, the method of covering the liquid absorption collecting portions 36A and 36B with the sheet material 41 is not necessarily limited to this. For example, you may make it provide the 1st sheet | seat material 37 so that liquid absorption gathering part 36A, 36B may be wrapped. In this case as well, if the opposite side portions 41b and 41c of the sheet material 41 are not fixed to each other, the liquid absorption collecting portions 36A and 36B (especially the first liquid absorption portion) It is possible to suppress the swelling in the thickness direction of 27) from being restricted by the sheet material 41.

  In the above embodiment, the sheet material 41 covers the first liquid absorption part 27, the second liquid absorption part 28, and the third liquid absorption part 29 (that is, the liquid absorption assembly parts 36A and 36B). 41 may cover only the first liquid absorption part 27 and the second liquid absorption part 28. In this case, the first liquid absorption part 27 and the second liquid absorption part 28 constitute a liquid absorption assembly part.

  (6) In the above embodiment, only one groove portion 31 is provided in the absorber 13, but a plurality of groove portions 31 may be provided in the absorber 13. For example, it is conceivable to provide two (a pair) of groove portions 31 in the absorber 13. In this case, the 1st liquid absorption part 27 and the 2nd liquid absorption part 28 are arrange | positioned at the both sides which pinched | interposed these pair of groove parts 31, respectively. And each 2nd liquid absorption part 28 is arrange | positioned adjacent to the groove part 31, respectively, Each 1st liquid absorption part 27 is arrange | positioned adjacent to the 2nd liquid absorption part 28 on the opposite side to the groove part 31, respectively. Can be considered. Even in this case, on both sides of each absorber 31 in the absorbent body 13, a portion of the absorbent body 13 that is farther from the groove portion 31 than the portion adjacent to the groove portion 31 can be projected to the top sheet 11 side. A liquid such as urine can be easily guided from the protruding portion toward the groove portion 31.

  (7) In the above embodiment, the groove portion 31 is provided in the absorber 30 as a liquid passage. However, a slit may be provided instead of the groove portion 31. That is, a slit that penetrates the absorber 30 in the thickness direction may be provided, and the slit may be used as a liquid passage. For example, a slit penetrating in the thickness direction is also formed in the backsheet side layer 22, and the slit and the slits 32 to 34 of the topsheet side layer 21, the first intermediate layer 23, and the second intermediate layer 24 are communicated. And it is possible to form the slit (equivalent to a liquid channel | path) which penetrates the absorber 13 in the thickness direction with those slits.

  (8) The absorbent body 30 may not be provided with the groove 31 and thus the liquid passage. FIG. 5 shows an absorbent body 50 that does not have the groove 31. Hereinafter, based on this FIG. 5, the structure of this absorber 50 is demonstrated. 5A shows a state (initial state) before the absorbent body 50 absorbs the liquid and swells, and FIG. 5B shows a state after the absorbent body 50 absorbs the liquid and swells. Is shown.

  As shown in FIG. 5A, the absorbent body 50 is disposed between the topsheet side layer 51, the backsheet side layer 52, and each of the layers 51 and 52, similarly to the absorbent body 13 of the above embodiment. It has a four-layer structure including two intermediate layers 53 and 54. Of the two intermediate layers, the first intermediate layer 53 adjacent to the top sheet side layer 51 side has a first liquid absorption part 55 and a second liquid absorption part 56 extending in the longitudinal direction. The 1st liquid absorption part 55 is formed with the highly water-absorbing polymer, and the 2nd liquid absorption part 56 is formed with the pulp. The first liquid absorption part 55 is disposed on both ends in the width direction of the first intermediate layer 53, and the second liquid absorption part 56 is disposed between the first liquid absorption parts 55. It is arranged adjacent to.

  In the above-described configuration, when a liquid such as urine is absorbed by the absorbent body 50 (the liquid absorbent layers 51 to 54), the absorbent body 50 swells in the thickness direction as shown in FIG. In this case, the first intermediate layer 53 is provided with the first liquid absorption part 55 and the second liquid absorption part 56 having different degrees of swelling in the thickness direction. The thickness of each first liquid absorption part 55 disposed on both ends of the second liquid absorption part is greater than the thickness of the second liquid absorption part 56 disposed in the intermediate part in the width direction. Therefore, both ends of the absorbent body 50 in the width direction can be projected to the top sheet 11 side after the absorbent body 50 is swollen, and as a result, the liquid flows to the outer side of the absorbent body 50 in the width direction. Can be suppressed. Therefore, the occurrence of side leakage can be suppressed.

  (9) In the said embodiment, although this invention was applied to the tape-type disposable diaper 10, you may apply this invention to a pants-type disposable diaper. Moreover, you may apply this invention to the disposable diaper for children not only for adults. Furthermore, you may apply this invention not only to a disposable diaper but to other absorbent articles, such as a urine pad, a light incontinence pad, and a sanitary napkin.

  DESCRIPTION OF SYMBOLS 10 ... Disposable diaper as an absorbent article, 11 ... Top sheet, 12 ... Back sheet, 13 ... Absorber, 21 ... Top sheet side layer, 22 ... Back sheet side layer, 23 ... First intermediate layer, 24 ... Second Intermediate layer 27 ... 1st liquid absorption part, 28 ... 2nd liquid absorption part, 29 ... 3rd liquid absorption part, 31 ... Groove part as a liquid passage, 36A, 36B ... Liquid absorption collection part, 41 ... Sheet material.

Claims (8)

A liquid-permeable topsheet;
A liquid-impermeable backsheet;
An absorbent article comprising a vertically long absorber interposed between each sheet,
The absorber has a first liquid absorption part and a second liquid absorption part extending in the longitudinal direction,
The first liquid-absorbing parts are respectively disposed on both end sides in the width direction of the absorber,
Each of the first liquid absorption parts is disposed adjacent to the second liquid absorption part on the center side in the width direction,
Each said 1st liquid absorption part has the swelling degree to the thickness direction at the time of liquid absorption larger than the said 2nd liquid absorption part, The absorbent article characterized by the above-mentioned. The absorbent body is provided with one or a plurality of liquid passages extending along the longitudinal direction and including grooves or slits opened to the top sheet side,
The second liquid-absorbing portions are respectively disposed on both sides of the one or more liquid passages in the width direction,
Each of the second liquid absorbing portions is disposed adjacent to the liquid passage,
2. The absorbent article according to claim 1, wherein each of the second liquid-absorbing parts is adjacent to the first liquid-absorbing part on the side opposite to the liquid passage. The absorber has a third liquid absorbing portion laminated on each of the liquid absorbing portions in a state straddling the adjacent first liquid absorbing portion and the second liquid absorbing portion,
The third liquid-absorbing part is disposed adjacent to the liquid passage in the width direction together with the second liquid-absorbing part, and the degree of swelling in the thickness direction is larger than that of the second liquid-absorbing part. The absorbent article according to claim 2.   The absorbent article according to claim 3, wherein the third liquid absorption part is disposed on the back sheet side of the adjacent first liquid absorption part and the second liquid absorption part. The first liquid-absorbing part is formed including a highly water-absorbing polymer,
While covering at least the first liquid-absorbing part and the second liquid-absorbing part adjacent to each other, the liquid-permeable sheet material extending along each liquid-absorbing part,
The sheet material is folded on the liquid passage side, and both side portions sandwiching the folded portion are disposed on both sides in the thickness direction of the adjacent first liquid absorbing portion and second liquid absorbing portion, respectively.
The absorbent article according to any one of claims 2 to 4, wherein the both side portions of the sheet material are not fixed to each other on the side opposite to the folded portion. The sheet material covers the liquid absorption assembly part including at least the first liquid absorption part and the second liquid absorption part adjacent to each other,
The absorbent article according to claim 5, wherein the both side portions of the sheet material are respectively fixed to both surfaces in the thickness direction of the liquid absorption assembly portion. The one or more liquid passages include the groove portion,
The absorber includes a backsheet side layer provided across the backsheet side of each of the first liquid absorption portions and each of the second liquid absorption portions as a liquid absorption layer,
The absorbent article according to any one of claims 2 to 6, wherein the backsheet-side layer is disposed so as to cover the one or more grooves from the backsheet side. The first liquid-absorbing part is formed of a highly water-absorbing polymer,
The absorbent article according to any one of claims 1 to 7, wherein the second liquid-absorbing part is formed of a fiber material.

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