JP6583107B2 - Absorbent articles - Google Patents

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). Patent Document 1 discloses a configuration in which a groove extending in the longitudinal direction is provided in an absorber having such a polymer liquid absorption layer. In this configuration, when liquid such as urine is excreted, the liquid can be diffused through the groove portion, so that the liquid can be easily absorbed in a wide range in the longitudinal direction of the absorber.

  Moreover, in the structure of patent document 1, the polymer liquid absorption layer is coat | covered with a pair of core wrap sheet | seat arrange | positioned at the both sides of the thickness direction. These core wrap sheets are joined together at the periphery of the polymer liquid-absorbing layer and are joined together at the groove. In this case, each part separated by the groove in the polymer liquid absorption layer is in a state of being confined by the core wrap sheet.

JP 2013-39163 A

  By the way, in the structure of the said patent document 1, since each part of a polymer liquid absorption layer is confined by the core wrap sheet, a polymer liquid absorption layer (high water absorption polymer) absorbs a liquid and swells. In this case, swelling in the thickness direction is limited. For this reason, in the configuration of Patent Document 1, it is assumed that the thickness of the polymer liquid-absorbing layer is substantially constant in the width direction after liquid absorption (after swelling), and consequently the thickness of the absorber is substantially constant in the width direction. It is assumed that

  However, when the thickness of the absorbent body is constant after swelling, it is also assumed that the liquid flows to the side opposite to the groove portion in the width direction of the absorbent body when the liquid such as urine is excreted thereafter. . In that case, the liquid is not sufficiently diffused through the groove, and the liquid absorption efficiency may be reduced.

  This invention is made | formed in view of the said situation, and makes it a main objective to provide the absorbent article which can aim at the improvement of liquid absorption efficiency.

  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 portion formed including a highly water-absorbing polymer, and the first liquid absorbing portion extends in a longitudinal direction of the absorbent body. One or a plurality of liquid passages, each of which is arranged on both end sides in the width direction of the absorbent body, each of which has a groove or a slit extending along the longitudinal direction and opened to the top sheet side. Each of the first liquid-absorbing portions is disposed adjacent to the liquid passage on both sides of the one or more liquid passages, and each of the first liquid-absorbing portions is disposed along the longitudinal direction. The liquid permeability that extends and covers the first liquid absorption part First sheet material is provided, each of the first sheet materials is folded back on the liquid passage side, and both side portions sandwiching the folded portion are disposed on both surfaces in the thickness direction of the first liquid absorbing portion. In each of the first sheet materials, the both side portions are fixed to the both surfaces, respectively, while being opposite to each other on the side opposite to the folded portion.

  According to the present invention, the absorber has a pair of first liquid-absorbing parts including a highly water-absorbing polymer on both end sides in the width direction, and each of the first liquid-absorbing parts is provided in the absorber. It arrange | positions at the both sides on both sides of the 1 or several liquid channel | path. Moreover, each 1st liquid absorption part is each arrange | positioned adjacent to the liquid channel | path, and is coat | covered with the 1st sheet material. In this case, the first sheet material is folded on the liquid passage side, and both side portions sandwiching the folded portion are fixed to both surfaces in the thickness direction of the first liquid absorbing portion, while the both side portions are the folded portions. The opposite sides are not fixed to each other. Therefore, when the first liquid absorption part swells by absorbing the liquid, the swelling in the thickness direction is largely limited by the first sheet material (specifically, the folded part) on the liquid passage side in the first liquid absorption 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 first liquid-absorbing part swells, the thickness of the first liquid-absorbing part can be made larger on the side away from the liquid path than on the liquid-path side. In this case, a portion farther from the liquid passage than the portion adjacent to the liquid passage can be projected to the top sheet side. Thereby, since liquid such as urine can be easily guided from the overhanging portion toward the liquid passage, 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, by making it easier to guide the liquid to the liquid passage on both sides of the absorber with the one or more liquid passages interposed therebetween, it is possible to prevent the liquid from flowing to the opposite side of the liquid passage, that is, the outer side in the width direction of the absorber. can do. Therefore, it is possible to suppress so-called side leakage.

  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 assumed that it will remain unabsorbed. In that respect, in the above-described configuration, the liquid can be easily guided to the liquid passage after the absorbent body swells, 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.

  In the absorbent article of the second invention, in the first invention, in each of the first sheet materials, the opposite end portions of the both side portions face the outer side in the width direction of the absorbent body. It is characterized by that.

  According to this invention, the edge part (free end) on the opposite side to a folding | turning part in the both-sides part of a 1st sheet | seat material has faced the outer side of an absorber width direction, respectively. In this case, for example, the side away from the liquid passage in the first liquid-absorbing part when the first liquid-absorbing part swells compared to the case where the first sheet material is provided in a state of wrapping the first liquid-absorbing part. Can be swelled in the thickness direction. Thereby, the part away from the liquid passage in the absorber can be suitably projected to the top sheet side, and as a result, liquid such as urine can be more easily guided from the projecting part toward the liquid passage. it can.

  The absorbent article according to a third aspect of the present invention is the first or second aspect, wherein the absorbent body is provided with a plurality of the liquid passages, and the absorbent body is disposed between the adjacent liquid passages. The second liquid absorption part is provided adjacent to the liquid passage and extends in the longitudinal direction. The second liquid absorption part extends along the longitudinal direction, and the second liquid absorption part is provided with the second liquid absorption part. A liquid permeable second sheet material to be coated is provided, and the second sheet material is provided in a state of wrapping the second liquid absorbing part.

  According to the present invention, the absorbent body is provided with a plurality of liquid passages, and the second liquid absorbing portion disposed between the adjacent liquid passages in the absorbent body is covered with the second sheet material. In this case, since the second liquid-absorbing portion is in a state of being wrapped by the second sheet material, it is one sheet that the super absorbent polymer forming the second liquid-absorbing portion enters the adjacent liquid passages. This can be prevented by the material (second sheet material).

  The absorbent article according to a fourth aspect is characterized in that, in the third aspect, the second sheet material is fixed to each other at both end sides in the surrounding direction surrounding the second liquid-absorbing portion.

  According to the present invention, since both ends in the enclosing direction surrounding the second liquid absorbing part are fixed to each other in the second sheet material, the second sheet material forms an annular shape surrounding the second liquid absorbing part. In this case, since the swelling in the thickness direction of the second liquid-absorbing part can be limited by the second sheet material, the second liquid-absorbing part is prevented from projecting to the top sheet side from the first liquid-absorbing part. be able to. Thereby, it can suppress that the 2nd liquid absorption part located in the intermediate part of the width direction of an absorber protrudes to the top sheet side, and gives a wearer a local feeling of pressure.

  The absorbent article according to a fifth aspect of the present invention is the absorbent article according to the third or fourth aspect, wherein the second liquid-absorbing part is formed to contain a highly water-absorbing polymer, and the basis weight of the highly water-absorbing polymer is the first liquid-absorbing part. It is characterized by being made smaller than the portion or made of a fiber material.

  According to the present invention, the basis weight of the highly water-absorbing polymer in the second liquid-absorbing part is smaller than that in the first liquid-absorbing part, or the second liquid-absorbing part is formed of the fiber material. In this case, the second liquid-absorbing part can be prevented from swelling more in the thickness direction than the first liquid-absorbing part, so that the second liquid-absorbing part projects to the top sheet side from the first liquid-absorbing part. Can be suppressed. Thereby, the same effect as that of the fourth invention can be obtained.

  An absorbent article according to a sixth aspect of the present invention is the absorbent article according to any one of the first to fifth aspects, wherein the one or more liquid passages include the groove portions, and the absorbent body serves as a liquid absorption layer. It is provided with a backsheet side layer provided across the backsheet side of the liquid portion, and the backsheet side layer is disposed so as to cover the one or a plurality of grooves from the backsheet side. Features.

  According to the present invention, the back sheet side layer is provided across the back sheet side of each first liquid absorption part, and the back sheet side layer covers one or a plurality of grooves (liquid passages) from the back sheet side. Are arranged as follows. In this case, compared with the case where the liquid passage is formed of a slit penetrating through the back sheet side layer, each first liquid absorbing portion can be suppressed from swelling toward the back sheet side. For this reason, it is possible to promote swelling of each first liquid-absorbing part, specifically, a part away from the liquid passage in each first liquid-absorbing part (in other words, a part on both ends in the width direction of the absorber) toward the top sheet. it can. Thereby, the part away from the liquid passage in the absorber can be suitably projected to the top sheet side, and as a result, liquid such as urine can be more easily guided from the projecting part toward the liquid passage. it can.

  An absorbent article according to a seventh invention is the absorbent article according to any one of the first to sixth inventions, wherein the first liquid-absorbing part is formed of only a highly water-absorbing polymer, or a highly water-absorbing polymer as a main material. It is formed.

  According to the present invention, each of the first liquid-absorbing portions is formed of only the highly water-absorbing polymer having a large degree of swelling in the thickness direction, or is mainly composed of the highly water-absorbing polymer. The thickness of the liquid part can be made easier on the side away from the liquid passage than on the liquid passage side. Thereby, the part away from the liquid passage in the absorbent body can be projected from the top sheet side, and as a result, the liquid can be more easily guided from the projected portion toward the liquid passage. Therefore, the liquid absorption efficiency can be further improved.

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 a top sheet side layer, (b) is a front view showing an intermediate layer, and (c) is a front view showing a back sheet side layer.

  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 10 for short) includes an abdominal side portion 10a disposed on the abdomen side of the wearer at the time of wearing, a back side portion 10b disposed on the back side of the wearer, 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 21-23 laminated | stacked on the thickness direction, and the multilayer structure (the multiple liquid absorption layers 21-23 which consist of these liquid absorption layers 21-23) ( Specifically, it has a three-layer structure). 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. And an intermediate layer 23 disposed between the layers 22. Each of the liquid absorbing layers 21 to 23 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 is formed with a pair of grooves 31 that are open to the top sheet 11 side. These groove portions 31 extend along the longitudinal direction of the absorbent body 13 and are formed across the abdominal side portion 10a, the crotch portion 10c, and the back side portion 10b. Each groove part 31 is arrange | positioned at predetermined intervals in the width direction of the absorber 13, and is arrange | positioned in detail in the position which divides the absorber 13 equally in the width direction (3 equal parts). In this case, since liquid such as urine can be diffused in the longitudinal direction of the absorbent body 13 through these grooves 31, the liquid can be absorbed in a wide range in the longitudinal direction of the absorbent body 13. Each groove 31 corresponds to a liquid passage. Further, in the following, for convenience of explanation, A is given to the sign of one of the groove parts 31 and B is given to the sign of the other groove part 31.

  Each of the groove portions 31A and 31B is formed across the top sheet side layer 21 and the intermediate layer 23 of the absorber 13. Specifically, each of these layers 21 and 23 of the absorber 13 is formed with a pair of slits 33 and 34 extending in the longitudinal direction of the absorber 13 (see also FIGS. 4A and 4B). That is, the top sheet side layer 21 is formed with a pair of slits 33A and 33B penetrating in the thickness direction, and the intermediate layer 23 is formed with a pair of slits 34A and 34B penetrating in the thickness direction. In this case, the slit 33A of the topsheet side layer 21 and the slit 34A of the intermediate layer 23 are communicated with each other, and a groove portion 31A is formed by the communicated slits 33A and 34A. Further, the slit 33B of the top sheet side layer 21 and the slit 34B of the intermediate layer 23 are communicated with each other, and a groove portion 31B is formed by the communicated slits 33B and 34B.

  Next, the configuration of each of the liquid absorption layers 21 to 23 will be described with reference to FIG. 4 in addition to FIG. 4A is a front view showing the topsheet side layer 21, FIG. 4B is a front view showing the intermediate layer 23, and FIG. 4C is a front view showing the backsheet 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 top sheet side layer 21 has a pair of slits 33 as described above. As shown in FIG. 4A, these slits 33 are in a closed state in which both ends in the longitudinal direction do not reach the edge of the topsheet side layer 21. However, both ends in the longitudinal direction of these slits 33 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 (c), unlike the liquid absorption layers 21 and 23 other than that, the slit is not formed. Therefore, the back sheet side layer 22 is arranged in a state where the groove portions 31A and 31B of the absorber 13 are 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 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 and 28 extends over the entire length of the intermediate layer 23. Each of the liquid absorbing portions 27 and 28 is formed of a highly water-absorbing polymer, and more specifically, a polymer layer formed only of the highly water-absorbing polymer. More specifically, these liquid-absorbing parts 27 and 28 are different in basis weight (density) of the highly water-absorbing polymer, and the first liquid-absorbing part 27 is more highly water-absorbing than the second liquid-absorbing part 28. The basis weight of the polymer is large. Therefore, the first liquid-absorbing part 27 is a high-density polymer layer having a large basis weight of the highly water-absorbing polymer, and the second liquid-absorbing part 28 is a low-density polymer layer having a small basis weight of the highly water-absorbing polymer. It has become.

  The 1st liquid absorption part 27 is each arrange | positioned in the intermediate | middle layer 23 at the both ends side of the width direction. In this case, each of the first liquid absorbing portions 27 constitutes both end portions of the intermediate layer 23 in the width direction. A second liquid absorption part 28 is disposed between the first liquid absorption parts 27. A predetermined gap is formed between one first liquid-absorbing part 27 (hereinafter referred to as “A”) and the second liquid-absorbing part 28 among the first liquid-absorbing parts 27. Is the above-described slit 34A. Further, a predetermined gap is also formed between the other first liquid absorption part 27 (hereinafter referred to as “B”) and the second liquid absorption part 28, and the gap becomes the above-described slit 34B. ing. In this case, both of the slits 34A and 34B are open at both ends in the longitudinal direction. Further, each of the liquid absorbing portions 27A, 27B, and 28 has almost the same thickness, and all have the same width.

  Note that both ends of the slits 34A and 34B in the longitudinal direction are not necessarily opened and may be closed. In that case, each 1st liquid absorption part 27 and the 2nd liquid absorption part 28 will be in the state mutually integrated.

  The absorbent body 13 is provided with a first sheet material 37 that covers the first liquid absorption part 27 and a second sheet material 38 that covers the second liquid absorption part 28. These sheet materials 37 and 38 have liquid permeability and are made of, for example, a tissue. In addition, as these sheet materials 37 and 38, it may replace with a tissue and may use a nonwoven fabric.

  The first sheet material 37 includes a first sheet material 37A that covers the first liquid absorption part 27A and a first sheet material 37B that covers the first liquid absorption part 27B. These first sheet materials 37A and 37B all have the same configuration, and hereinafter, the configuration of each of the first sheet materials 37A and 37B will be described together.

  Each of the first sheet materials 37A (37B) has a long shape extending in the longitudinal direction of the first liquid absorbing portion 27A (27B), and more specifically extends over the entire longitudinal direction of the first liquid absorbing portion 27A (27B). ing. The first sheet material 37A (37B) is folded toward the outer side in the width direction of the absorbent body 13 on the groove 31A (31B) side. In the first sheet material 37A (37B), both side portions 37b and 37c sandwiching the folded portion 37a are disposed on both surfaces in the thickness direction of the first liquid absorbing portion 27A (27B). In this case, one of the side portions 37b and 37c (hereinafter referred to as the first portion 37b) is interposed between the first liquid absorbing portion 27A (27B) and the topsheet side layer 21, and the other (hereinafter referred to as the second portion). A portion 37 c) is interposed between the first liquid absorbing portion 27 </ b> A (27 </ b> B) and the backsheet side layer 22.

  In such a configuration, the first liquid-absorbing portion 27A (27B) is in a state where the first liquid-absorbing portion 27A (27B) is covered from the groove portion 31A (31B) side by the first sheet material 37A (37B). Can be prevented from entering the groove 31A (31B). For this reason, it is possible to avoid a situation in which the superabsorbent polymer enters and swells in the groove 31A (31B) and the groove 31A (31B) is blocked.

  The first portion 37b is bonded and fixed to the surface of the first liquid absorbing portion 27A (27B) on the top sheet 11 side by an adhesive (for example, hot melt adhesive), and more specifically, is fixed to the entire area of the surface. The second portion 37c is bonded and fixed to the surface of the first liquid absorbing portion 27A (27B) on the back sheet 12 side with an adhesive (for example, a hot melt adhesive), and more specifically, is bonded and fixed to the entire area of the surface. Yes. In FIG. 2, the adhesive 41 is indicated by a black circle for convenience. However, the first portion 37b and the second portion 37c are not necessarily bonded to the entire surface of the first liquid absorbing portion 27A (27B), and may be partially bonded.

  Both the first portion 37b and the second portion 37c are on the side opposite to the folded portion 37a, and a part thereof extends outward in the width direction (absorber width direction) from the first liquid absorbing portion 27A (27B). Yes. In this case, the extended portions of the portions 37b and 37c are end portions on the extended side, in other words, end portions 37d and 37e (free ends) on the opposite side of the folded portions 37a in the portions 37b and 37c. It faces the outside in the width direction. Therefore, the first liquid absorbing portion 27A (27B) is not covered from the outer side in the width direction by the first sheet material 37A (37B), and is exposed to the outer side in the width direction. In this case, the first portion 37b and the second portion 37c are not fixed to each other on the side opposite to the folded portion 37a.

  The second sheet material 38 has a long shape extending in the longitudinal direction of the second liquid absorbing portion 28, and specifically extends over the entire length of the second liquid absorbing portion 28. The second sheet material 38 is provided in a state of wrapping the second liquid absorption part 28, in other words, provided in a state of surrounding the second liquid absorption part 28. And the 2nd sheet | seat material 38 has mutually closed the both ends side of the surrounding direction, and has comprised the closed ring shape by it.

  Specifically, the second sheet material 38 has a cover portion 38 a that covers the surface of the second liquid absorbing portion 28 on the back sheet 12 side. In the second sheet material 38, both side portions 38b and 38c sandwiching the cover portion 38a are folded back in the width direction at the groove portions 31A and 31B, respectively, to cover the surface of the second liquid absorbing portion 28 on the top sheet 11 side. . In this case, since the second liquid absorbing portion 28 is covered from the respective groove portions 31A and 31B by the second sheet material 38, the highly water-absorbing polymer forming the second liquid absorbing portion 28 is in each state. It is possible to prevent the grooves 31A and 31B from entering. For this reason, it is possible to avoid a situation in which the highly water-absorbing polymer enters the groove portions 31A and 31B and swells and the groove portions 31A and 31B are blocked.

  Further, both side portions 38b, 38c of the second sheet material 38 overlap each other on the surface of the second liquid absorbing portion 28 on the top sheet 11 side, and are bonded and fixed to each other using a hot melt adhesive at the overlapping portion 38d. Yes. Thus, the second sheet material 38 forms a closed ring surrounding the second liquid absorbing portion 28. In FIG. 2, for convenience, the adhesive 42 is indicated by a black circle. Further, the cover portion 38 a and the side portions 38 b and 38 c (and thus the second sheet material 38) of the second sheet material 38 are not fixed to the second liquid absorbing portion 28 by an adhesive or the like.

  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.

  In the intermediate layer 23, as described above, the first liquid absorbing portions 27A and 27B are covered with the first sheet materials 37A and 37B, respectively. In this case, both side portions 37b and 37c (first portion 37b and second portion 37c) sandwiching the folded portion 37a of the first sheet material 37A and 37B are fixed to both surfaces in the thickness direction of the first liquid absorbing portions 27A and 27B, respectively. On the other hand, the opposite sides across the folded portion 37a are not fixed to each other. Therefore, when the first liquid absorbing parts 27A and 27B absorb the liquid and swell, the first sheet material 37 (details) is swollen in the thickness direction on the groove parts 31A and 31B side in the first liquid absorbing parts 27A and 27B. Is greatly limited by the folded portion 37a), but the swelling in the thickness direction is not limited as much as the groove portions 31A and 31B on the side away from the groove portions 31A and 31B. For this reason, in such a configuration, when the first liquid absorption parts 27A and 27B swell, the thickness of the first liquid absorption parts 27A and 27B is closer to the groove parts 31A and 31B than the groove parts 31A and 31B. Can be bigger. Therefore, in this case, the portion of the absorbent body 13 that is farther from the groove portions 31A and 31B than the portion adjacent to the groove portions 31A and 31B (in other words, both end sides in the width direction of the absorbent body 13) is projected to the top sheet 11 side. As a result, liquid such as urine can be easily guided from the overhanging portions toward the grooves 31A and 31B. Specifically, the above-described overhanging portion is formed on the absorbent body 13 so that the surface on the top sheet 11 side of the absorbent body 13 is inclined so as to approach the back sheet 12 side toward the groove portions 31A and 31B. Is formed, and the liquid can be easily guided to the grooves 31A and 31B along the inclined surface. Thereby, the diffusion of the liquid through the groove portions 31A and 31B can be promoted, and as a result, the liquid absorption efficiency can be improved. In addition, in FIG.3 (b), the flow of the liquid toward groove part 31A, 31B is shown by the arrow line.

  Further, as described above, the liquid can be easily guided to the groove 31 on both sides of the absorber 13 with the groove 31 interposed therebetween, so that the liquid flows on the opposite side to the groove 31, that is, on the outer side in the width direction of the absorber 13. Can be suppressed. Therefore, it is possible to suppress so-called side leakage.

  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 assumed that it remains without being absorbed. In that respect, as described above, in the above-described embodiment, the liquid is easily guided to the groove portion 31 after the absorbent body 13 is swollen. Therefore, the liquid remaining without being absorbed can be suitably guided to the groove portion 31. . Therefore, it is possible to suitably improve the liquid absorption efficiency after the absorbent body 13 is swollen.

  In both side portions 37b and 37c of the first sheet material 37, end portions 37d and 37e (free ends) opposite to the folded-back portion 37a are directed outward in the absorbent body width direction. In this case, for example, when the first liquid absorbing part 27 swells, the first sheet material 37 is separated from the groove 31 in the first liquid absorbing part 27 as compared with a case where the first sheet material 37 is provided in a state of wrapping the first liquid absorbing part 27. Swelling in the thickness direction can be promoted on the other side. Thereby, since the part away from the groove part 31 in the absorber 13 can be suitably protruded to the top sheet 11 side, liquids, such as urine, can be more easily guided toward the groove part 31 from the overhang | projection part. it can.

  Since the second liquid absorbing portion 28 provided between the adjacent groove portions 31A and 31B is wrapped with the second sheet material 38, the highly water-absorbing polymer forming the second liquid absorbing portion 28 is transferred to the groove portions 31A and 31B. Intrusion can be prevented by one sheet material (second sheet material 38).

  Since both ends in the enclosing direction surrounding the second liquid absorbing portion 28 in the second sheet material 38 are fixed to each other, the second sheet material 38 forms an annular shape surrounding the second liquid absorbing portion 28. In this case, since the swelling in the thickness direction of the second liquid absorbing portion 28 can be limited by the second sheet material 38, the second liquid absorbing portion 28 is stretched closer to the top sheet 11 than the first liquid absorbing portion 27. It can be suppressed from taking out. Thereby, it can suppress that the 2nd liquid absorption part 28 located in the intermediate part of the width direction of the absorber 13 protrudes to the top sheet 11 side, and gives a wearer a local feeling of pressure.

  Further, since the basis weight of the highly water-absorbing polymer in the second liquid-absorbing part 28 is made smaller than the basis weight of the highly water-absorbing polymer in the first liquid-absorbing part 27, the second liquid-absorbing part 28 is more than the first liquid-absorbing part 27. Can also be prevented from greatly swelling in the thickness direction. Therefore, also from this point, it can suppress that the 2nd liquid absorption part 28 protrudes from the 1st liquid absorption part 27 to the top sheet 11 side. Thereby, it can further suppress that the 2nd liquid absorption part 28 protrudes to the top sheet 11 side, and gives a wearer a local feeling of pressure.

  The absorbent body 13 is provided with a back sheet side layer 22 that straddles the back sheet 12 side of each first liquid absorption part 27 as a liquid absorption layer, and the back sheet side layer 22 is provided to each groove 31A, from the back sheet 12 side. It arrange | positioned so that 31B (liquid channel | path) might be covered. In this case, compared with the case where the liquid passage includes a slit that penetrates including the back sheet side layer 22, it is possible to suppress the first liquid absorbing portions 27 from swelling to the back sheet 12 side. Therefore, each 1st liquid absorption part 27 Specifically, in each 1st liquid absorption part 27, the part (In other words, the part of the both ends side in the width direction of the absorber 13) in the top sheet 11 side is separated from groove part 31A, 31B. Swelling can be promoted. Thereby, the part away from groove part 31A, 31B in the absorber 13 can be suitably protruded to the top sheet 11 side, As a result, liquids, such as urine, are directed toward the groove part 31A, 31B from the overhang | projection part. It can be made easier to guide.

  Since each first liquid-absorbing part 27 is formed only by a highly water-absorbing polymer having a large degree of swelling in the thickness direction, the thickness of each first liquid-absorbing part 27 is larger on the side farther from the groove part 31 than on the groove part 31 side. It can be made easy. Thereby, the part away from the groove part 31 in the absorber 13 can be protruded by the top sheet 11 side, As a result, the liquid can be more easily guided from the protruding part toward the groove part 31. Therefore, the liquid absorption efficiency can be further improved.

  Since both side portions 37b and 37c sandwiching the folded portion 37a of the first sheet material 37 are bonded and fixed to the first liquid absorbing portion 27, the first liquid absorbing portion 27 becomes the first sheet material as the first liquid absorbing portion 27 swells. 37 can be prevented from being displaced from the position.

  Since the first sheet material 37 is composed of a tissue having excellent diffusibility, the first liquid absorbing part 27 can be quickly swollen. Therefore, it is possible to quickly obtain the above-described effects such as improvement in liquid absorption efficiency associated with the swelling.

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

  (1) In the above embodiment, when the first liquid absorbing portion 27 is covered with the first sheet material 37, the end portions 37 d and 37 e on the opposite side of the folded portion 37 a in the both side portions 37 b and 37 c of the first sheet material 37. However, the method of covering the first liquid-absorbing part 27 with the first sheet material 37 is not necessarily limited to this. For example, you may make it provide the 1st sheet material 37 so that the 1st liquid absorption part 27 may be wrapped. Also in this case, if the opposite sides of the folded portions 37a of the both side portions 37b and 37c of the first sheet material 37 are not fixed to each other, the first absorbing portion 27 is swollen when the first absorbing portion 27 swells. The swelling in the thickness direction of the portion of the liquid portion 27 away from the groove portion 31 is not limited as far as the groove portion 31 side. Therefore, also in this case, when the first liquid absorption part 27 swells, the thickness of the first liquid absorption part 27 can be increased on the side farther from the groove part 31 than on the groove part 31 side.

  (2) In the above embodiment, both end sides in the enclosing direction surrounding the second liquid absorbing portion 28 in the second sheet material 38 are fixed to each other. However, both end sides may not be fixed to each other. Even in this case, if the second liquid-absorbing part 28 is formed with a smaller basis weight of the highly water-absorbing polymer than the first liquid-absorbing part 27, the swelling of the second liquid-absorbing part 28 in the thickness direction is suppressed. Therefore, the second liquid-absorbing part 28 can be prevented from projecting to the top sheet 11 side than the first liquid-absorbing part 27 and giving a feeling of pressure to the wearer.

  (3) In the above embodiment, the absorber 13 is provided with a pair (two) of the groove portions 31, but the absorber 13 may be provided with three or more groove portions 31. In that case, the second liquid absorbing portion 28 is provided for each of the adjacent groove portions 31 in the intermediate layer 23, and each of the second liquid absorbing portions 28 has a basis weight of the superabsorbent polymer higher than that of the first liquid absorbing portion 27. It is conceivable to make it smaller. In addition, each second liquid absorbing portion 28 is covered (enclosed) with the second sheet material 38, and both ends of the second sheet material 38 surrounding the second liquid absorbing portion 28 in the enclosing direction are fixed to each other. You may make it do. In any case, each second liquid absorbing portion 28 located in the intermediate portion in the width direction of the absorbent body 13 can be prevented from swelling in the thickness direction, so that each second liquid absorbing portion 28 is It can suppress that it overhangs to the top sheet 11 side rather than the 1 liquid-absorbing part 27, and gives a wearer a feeling of pressure.

  Note that only one groove 31 may be provided in the absorber 13.

  (4) In the above-described embodiment, the first liquid absorption part 27 and the second liquid absorption part 28 are both made of only the highly water-absorbing polymer. There is no need to form. For example, it is conceivable to form the superabsorbent polymer as a main material while including one or both of the liquid absorbing portions 27 and 28 including a material other than the superabsorbent polymer. Also in this case, if the basis weight of the highly water-absorbing polymer in the second liquid-absorbing part 28 is made smaller than the basis weight of the highly water-absorbing polymer in the first liquid-absorbing part 27, the second liquid-absorbing part 28 is the first liquid-absorbing part 28. Swelling in the thickness direction larger than the liquid absorption part 27 can be suppressed.

  Further, either one or both of the liquid absorbing portions 27 and 28 may be formed by mixing a super absorbent polymer and a fiber material such as pulp. Even in that case, if the basis weight of the highly water-absorbing polymer in the second liquid-absorbing part 28 is made smaller than the basis weight of the highly water-absorbing polymer in the first liquid-absorbing part 27, the second liquid-absorbing part 28 will be the first liquid-absorbing part 28. Swelling in the thickness direction larger than the liquid absorption part 27 can be suppressed.

  Furthermore, you may form the 2nd liquid absorption part 28 with fiber materials, such as a pulp. That is, the 2nd liquid absorption part 28 may be formed only with a fiber material, or you may form a fiber material as a main material. In that case, the swelling of the second liquid absorbing portion 28 in the thickness direction can be greatly suppressed.

  (5) In the above embodiment, the groove portion 31 is provided as a liquid passage in the absorber 30, but 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 is communicated with the slits 33 and 34 of the topsheet side layer 21 and the intermediate layer 23. 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.

  (6) 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 ... Intermediate layer, 27 ... First liquid absorption Part, 28 ... second liquid absorbing part, 31 ... groove part as liquid passage, 37 ... first sheet material, 38 ... second sheet material.

Claims (6)

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-absorbing part formed including a highly water-absorbing polymer,
The first liquid-absorbing part extends in the longitudinal direction of the absorber and is disposed on both ends in the width direction of the absorber,
The absorbent body is provided with one or a plurality of liquid passages extending along a longitudinal direction thereof and including a groove or a slit opened to the top sheet side,
Each of the first liquid absorbing portions is disposed adjacent to the liquid passage on both sides of the one or more liquid passages,
Each of the first liquid-absorbing portions is provided with a liquid-permeable first sheet material that extends along the longitudinal direction and covers the first liquid-absorbing portions,
Each of the first sheet materials is folded on the liquid passage side, and both side portions sandwiching the folded portion are disposed on both surfaces in the thickness direction of the first liquid absorbing portion,
In each of the first sheet material, the both side portions are fixed to the both surfaces, respectively, while being opposite to each other on the folded portion ,
The absorber is provided with a plurality of the liquid passages,
The absorber is provided adjacent to each of the liquid passages between the adjacent liquid passages, and has a second liquid absorbing portion extending in the longitudinal direction,
The second liquid-absorbing part is provided with a liquid-permeable second sheet material that extends along the longitudinal direction and covers the second liquid-absorbing part,
The said 2nd sheet | seat material is provided in the state which wrapped the said 2nd liquid absorption part, The absorbent article characterized by the above-mentioned .   2. The absorbent article according to claim 1, wherein in each of the first sheet materials, the end portions on the opposite sides of the folded portions are directed outward in the width direction of the absorbent body. The absorbent article according to claim 1 or 2 , wherein the second sheet material is fixed to each other at both ends in an enclosing direction surrounding the second liquid-absorbing portion. The second liquid-absorbing part is formed including a highly water-absorbing polymer, and the basis weight of the highly water-absorbing polymer is smaller than that of the first liquid-absorbing part, or is formed of a fiber material. The absorbent article according to any one of claims 1 to 3 . The one or more liquid passages include the groove portion,
The absorber includes a backsheet side layer provided across the backsheet side of each first liquid absorption portion as a liquid absorption layer,
The absorbent article according to any one of claims 1 to 4 , wherein the backsheet-side layer is disposed so as to cover the one or a plurality of grooves from the backsheet side. The said 1st liquid absorption part is formed only with the high water absorption polymer, or is formed using the high water absorption polymer as a main material, The Claim 1 thru | or 5 characterized by the above-mentioned. Absorbent article.

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